Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 1 | /* vi: set sw=4 ts=4: */ |
| 2 | /* |
| 3 | * A prototype Bourne shell grammar parser. |
| 4 | * Intended to follow the original Thompson and Ritchie |
| 5 | * "small and simple is beautiful" philosophy, which |
| 6 | * incidentally is a good match to today's BusyBox. |
| 7 | * |
| 8 | * Copyright (C) 2000,2001 Larry Doolittle <larry@doolittle.boa.org> |
| 9 | * Copyright (C) 2008,2009 Denys Vlasenko <vda.linux@googlemail.com> |
| 10 | * |
| 11 | * Licensed under GPLv2 or later, see file LICENSE in this source tree. |
| 12 | * |
| 13 | * Credits: |
| 14 | * The parser routines proper are all original material, first |
| 15 | * written Dec 2000 and Jan 2001 by Larry Doolittle. The |
| 16 | * execution engine, the builtins, and much of the underlying |
| 17 | * support has been adapted from busybox-0.49pre's lash, which is |
| 18 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org> |
| 19 | * written by Erik Andersen <andersen@codepoet.org>. That, in turn, |
| 20 | * is based in part on ladsh.c, by Michael K. Johnson and Erik W. |
| 21 | * Troan, which they placed in the public domain. I don't know |
| 22 | * how much of the Johnson/Troan code has survived the repeated |
| 23 | * rewrites. |
| 24 | * |
| 25 | * Other credits: |
| 26 | * o_addchr derived from similar w_addchar function in glibc-2.2. |
| 27 | * parse_redirect, redirect_opt_num, and big chunks of main |
| 28 | * and many builtins derived from contributions by Erik Andersen. |
| 29 | * Miscellaneous bugfixes from Matt Kraai. |
| 30 | * |
| 31 | * There are two big (and related) architecture differences between |
| 32 | * this parser and the lash parser. One is that this version is |
| 33 | * actually designed from the ground up to understand nearly all |
| 34 | * of the Bourne grammar. The second, consequential change is that |
| 35 | * the parser and input reader have been turned inside out. Now, |
| 36 | * the parser is in control, and asks for input as needed. The old |
| 37 | * way had the input reader in control, and it asked for parsing to |
| 38 | * take place as needed. The new way makes it much easier to properly |
| 39 | * handle the recursion implicit in the various substitutions, especially |
| 40 | * across continuation lines. |
| 41 | * |
| 42 | * TODOs: |
| 43 | * grep for "TODO" and fix (some of them are easy) |
| 44 | * make complex ${var%...} constructs support optional |
| 45 | * make here documents optional |
| 46 | * special variables (done: PWD, PPID, RANDOM) |
| 47 | * follow IFS rules more precisely, including update semantics |
| 48 | * tilde expansion |
| 49 | * aliases |
| 50 | * "command" missing features: |
| 51 | * command -p CMD: run CMD using default $PATH |
| 52 | * (can use this to override standalone shell as well?) |
| 53 | * command BLTIN: disables special-ness (e.g. errors do not abort) |
| 54 | * command -V CMD1 CMD2 CMD3 (multiple args) (not in standard) |
| 55 | * builtins mandated by standards we don't support: |
| 56 | * [un]alias, fc: |
| 57 | * fc -l[nr] [BEG] [END]: list range of commands in history |
| 58 | * fc [-e EDITOR] [BEG] [END]: edit/rerun range of commands |
| 59 | * fc -s [PAT=REP] [CMD]: rerun CMD, replacing PAT with REP |
| 60 | * |
| 61 | * Bash compat TODO: |
| 62 | * redirection of stdout+stderr: &> and >& |
| 63 | * reserved words: function select |
| 64 | * advanced test: [[ ]] |
| 65 | * process substitution: <(list) and >(list) |
| 66 | * let EXPR [EXPR...] |
| 67 | * Each EXPR is an arithmetic expression (ARITHMETIC EVALUATION) |
| 68 | * If the last arg evaluates to 0, let returns 1; 0 otherwise. |
| 69 | * NB: let `echo 'a=a + 1'` - error (IOW: multi-word expansion is used) |
| 70 | * ((EXPR)) |
| 71 | * The EXPR is evaluated according to ARITHMETIC EVALUATION. |
| 72 | * This is exactly equivalent to let "EXPR". |
| 73 | * $[EXPR]: synonym for $((EXPR)) |
| 74 | * indirect expansion: ${!VAR} |
| 75 | * substring op on @: ${@:n:m} |
| 76 | * |
| 77 | * Won't do: |
| 78 | * Some builtins mandated by standards: |
| 79 | * newgrp [GRP]: not a builtin in bash but a suid binary |
| 80 | * which spawns a new shell with new group ID |
| 81 | * |
| 82 | * Status of [[ support: |
| 83 | * [[ args ]] are CMD_SINGLEWORD_NOGLOB: |
| 84 | * v='a b'; [[ $v = 'a b' ]]; echo 0:$? |
| 85 | * [[ /bin/n* ]]; echo 0:$? |
| 86 | * = is glob match operator, not equality operator: STR = GLOB |
| 87 | * == same as = |
| 88 | * =~ is regex match operator: STR =~ REGEX |
| 89 | * TODO: |
| 90 | * quoting needs to be considered (-f is an operator, "-f" and ""-f are not; etc) |
| 91 | * in word = GLOB, quoting should be significant on char-by-char basis: a*cd"*" |
| 92 | */ |
| 93 | //config:config HUSH |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 94 | //config: bool "hush (70 kb)" |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 95 | //config: default y |
| 96 | //config: select SHELL_HUSH |
| 97 | //config: help |
| 98 | //config: hush is a small shell. It handles the normal flow control |
| 99 | //config: constructs such as if/then/elif/else/fi, for/in/do/done, while loops, |
| 100 | //config: case/esac. Redirections, here documents, $((arithmetic)) |
| 101 | //config: and functions are supported. |
| 102 | //config: |
| 103 | //config: It will compile and work on no-mmu systems. |
| 104 | //config: |
| 105 | //config: It does not handle select, aliases, tilde expansion, |
| 106 | //config: &>file and >&file redirection of stdout+stderr. |
| 107 | //config: |
| 108 | // This option is visible (has a description) to make it possible to select |
| 109 | // a "scripted" applet (such as NOLOGIN) but avoid selecting any shells: |
| 110 | //config:config SHELL_HUSH |
| 111 | //config: bool "Internal shell for embedded script support" |
| 112 | //config: default n |
| 113 | //config: |
| 114 | //config:# hush options |
| 115 | //config:# It's only needed to get "nice" menuconfig indenting. |
| 116 | //config:if SHELL_HUSH || HUSH || SH_IS_HUSH || BASH_IS_HUSH |
| 117 | //config: |
| 118 | //config:config HUSH_BASH_COMPAT |
| 119 | //config: bool "bash-compatible extensions" |
| 120 | //config: default y |
| 121 | //config: depends on SHELL_HUSH |
| 122 | //config: |
| 123 | //config:config HUSH_BRACE_EXPANSION |
| 124 | //config: bool "Brace expansion" |
| 125 | //config: default y |
| 126 | //config: depends on HUSH_BASH_COMPAT |
| 127 | //config: help |
| 128 | //config: Enable {abc,def} extension. |
| 129 | //config: |
| 130 | //config:config HUSH_BASH_SOURCE_CURDIR |
| 131 | //config: bool "'source' and '.' builtins search current directory after $PATH" |
| 132 | //config: default n # do not encourage non-standard behavior |
| 133 | //config: depends on HUSH_BASH_COMPAT |
| 134 | //config: help |
| 135 | //config: This is not compliant with standards. Avoid if possible. |
| 136 | //config: |
| 137 | //config:config HUSH_LINENO_VAR |
| 138 | //config: bool "$LINENO variable (bashism)" |
| 139 | //config: default y |
| 140 | //config: depends on SHELL_HUSH |
| 141 | //config: |
| 142 | //config:config HUSH_INTERACTIVE |
| 143 | //config: bool "Interactive mode" |
| 144 | //config: default y |
| 145 | //config: depends on SHELL_HUSH |
| 146 | //config: help |
| 147 | //config: Enable interactive mode (prompt and command editing). |
| 148 | //config: Without this, hush simply reads and executes commands |
| 149 | //config: from stdin just like a shell script from a file. |
| 150 | //config: No prompt, no PS1/PS2 magic shell variables. |
| 151 | //config: |
| 152 | //config:config HUSH_SAVEHISTORY |
| 153 | //config: bool "Save command history to .hush_history" |
| 154 | //config: default y |
| 155 | //config: depends on HUSH_INTERACTIVE && FEATURE_EDITING_SAVEHISTORY |
| 156 | //config: |
| 157 | //config:config HUSH_JOB |
| 158 | //config: bool "Job control" |
| 159 | //config: default y |
| 160 | //config: depends on HUSH_INTERACTIVE |
| 161 | //config: help |
| 162 | //config: Enable job control: Ctrl-Z backgrounds, Ctrl-C interrupts current |
| 163 | //config: command (not entire shell), fg/bg builtins work. Without this option, |
| 164 | //config: "cmd &" still works by simply spawning a process and immediately |
| 165 | //config: prompting for next command (or executing next command in a script), |
| 166 | //config: but no separate process group is formed. |
| 167 | //config: |
| 168 | //config:config HUSH_TICK |
| 169 | //config: bool "Support command substitution" |
| 170 | //config: default y |
| 171 | //config: depends on SHELL_HUSH |
| 172 | //config: help |
| 173 | //config: Enable `command` and $(command). |
| 174 | //config: |
| 175 | //config:config HUSH_IF |
| 176 | //config: bool "Support if/then/elif/else/fi" |
| 177 | //config: default y |
| 178 | //config: depends on SHELL_HUSH |
| 179 | //config: |
| 180 | //config:config HUSH_LOOPS |
| 181 | //config: bool "Support for, while and until loops" |
| 182 | //config: default y |
| 183 | //config: depends on SHELL_HUSH |
| 184 | //config: |
| 185 | //config:config HUSH_CASE |
| 186 | //config: bool "Support case ... esac statement" |
| 187 | //config: default y |
| 188 | //config: depends on SHELL_HUSH |
| 189 | //config: help |
| 190 | //config: Enable case ... esac statement. +400 bytes. |
| 191 | //config: |
| 192 | //config:config HUSH_FUNCTIONS |
| 193 | //config: bool "Support funcname() { commands; } syntax" |
| 194 | //config: default y |
| 195 | //config: depends on SHELL_HUSH |
| 196 | //config: help |
| 197 | //config: Enable support for shell functions. +800 bytes. |
| 198 | //config: |
| 199 | //config:config HUSH_LOCAL |
| 200 | //config: bool "local builtin" |
| 201 | //config: default y |
| 202 | //config: depends on HUSH_FUNCTIONS |
| 203 | //config: help |
| 204 | //config: Enable support for local variables in functions. |
| 205 | //config: |
| 206 | //config:config HUSH_RANDOM_SUPPORT |
| 207 | //config: bool "Pseudorandom generator and $RANDOM variable" |
| 208 | //config: default y |
| 209 | //config: depends on SHELL_HUSH |
| 210 | //config: help |
| 211 | //config: Enable pseudorandom generator and dynamic variable "$RANDOM". |
| 212 | //config: Each read of "$RANDOM" will generate a new pseudorandom value. |
| 213 | //config: |
| 214 | //config:config HUSH_MODE_X |
| 215 | //config: bool "Support 'hush -x' option and 'set -x' command" |
| 216 | //config: default y |
| 217 | //config: depends on SHELL_HUSH |
| 218 | //config: help |
| 219 | //config: This instructs hush to print commands before execution. |
| 220 | //config: Adds ~300 bytes. |
| 221 | //config: |
| 222 | //config:config HUSH_ECHO |
| 223 | //config: bool "echo builtin" |
| 224 | //config: default y |
| 225 | //config: depends on SHELL_HUSH |
| 226 | //config: |
| 227 | //config:config HUSH_PRINTF |
| 228 | //config: bool "printf builtin" |
| 229 | //config: default y |
| 230 | //config: depends on SHELL_HUSH |
| 231 | //config: |
| 232 | //config:config HUSH_TEST |
| 233 | //config: bool "test builtin" |
| 234 | //config: default y |
| 235 | //config: depends on SHELL_HUSH |
| 236 | //config: |
| 237 | //config:config HUSH_HELP |
| 238 | //config: bool "help builtin" |
| 239 | //config: default y |
| 240 | //config: depends on SHELL_HUSH |
| 241 | //config: |
| 242 | //config:config HUSH_EXPORT |
| 243 | //config: bool "export builtin" |
| 244 | //config: default y |
| 245 | //config: depends on SHELL_HUSH |
| 246 | //config: |
| 247 | //config:config HUSH_EXPORT_N |
| 248 | //config: bool "Support 'export -n' option" |
| 249 | //config: default y |
| 250 | //config: depends on HUSH_EXPORT |
| 251 | //config: help |
| 252 | //config: export -n unexports variables. It is a bash extension. |
| 253 | //config: |
| 254 | //config:config HUSH_READONLY |
| 255 | //config: bool "readonly builtin" |
| 256 | //config: default y |
| 257 | //config: depends on SHELL_HUSH |
| 258 | //config: help |
| 259 | //config: Enable support for read-only variables. |
| 260 | //config: |
| 261 | //config:config HUSH_KILL |
| 262 | //config: bool "kill builtin (supports kill %jobspec)" |
| 263 | //config: default y |
| 264 | //config: depends on SHELL_HUSH |
| 265 | //config: |
| 266 | //config:config HUSH_WAIT |
| 267 | //config: bool "wait builtin" |
| 268 | //config: default y |
| 269 | //config: depends on SHELL_HUSH |
| 270 | //config: |
| 271 | //config:config HUSH_COMMAND |
| 272 | //config: bool "command builtin" |
| 273 | //config: default y |
| 274 | //config: depends on SHELL_HUSH |
| 275 | //config: |
| 276 | //config:config HUSH_TRAP |
| 277 | //config: bool "trap builtin" |
| 278 | //config: default y |
| 279 | //config: depends on SHELL_HUSH |
| 280 | //config: |
| 281 | //config:config HUSH_TYPE |
| 282 | //config: bool "type builtin" |
| 283 | //config: default y |
| 284 | //config: depends on SHELL_HUSH |
| 285 | //config: |
| 286 | //config:config HUSH_TIMES |
| 287 | //config: bool "times builtin" |
| 288 | //config: default y |
| 289 | //config: depends on SHELL_HUSH |
| 290 | //config: |
| 291 | //config:config HUSH_READ |
| 292 | //config: bool "read builtin" |
| 293 | //config: default y |
| 294 | //config: depends on SHELL_HUSH |
| 295 | //config: |
| 296 | //config:config HUSH_SET |
| 297 | //config: bool "set builtin" |
| 298 | //config: default y |
| 299 | //config: depends on SHELL_HUSH |
| 300 | //config: |
| 301 | //config:config HUSH_UNSET |
| 302 | //config: bool "unset builtin" |
| 303 | //config: default y |
| 304 | //config: depends on SHELL_HUSH |
| 305 | //config: |
| 306 | //config:config HUSH_ULIMIT |
| 307 | //config: bool "ulimit builtin" |
| 308 | //config: default y |
| 309 | //config: depends on SHELL_HUSH |
| 310 | //config: |
| 311 | //config:config HUSH_UMASK |
| 312 | //config: bool "umask builtin" |
| 313 | //config: default y |
| 314 | //config: depends on SHELL_HUSH |
| 315 | //config: |
| 316 | //config:config HUSH_GETOPTS |
| 317 | //config: bool "getopts builtin" |
| 318 | //config: default y |
| 319 | //config: depends on SHELL_HUSH |
| 320 | //config: |
| 321 | //config:config HUSH_MEMLEAK |
| 322 | //config: bool "memleak builtin (debugging)" |
| 323 | //config: default n |
| 324 | //config: depends on SHELL_HUSH |
| 325 | //config: |
| 326 | //config:endif # hush options |
| 327 | |
| 328 | //applet:IF_HUSH(APPLET(hush, BB_DIR_BIN, BB_SUID_DROP)) |
| 329 | // APPLET_ODDNAME:name main location suid_type help |
| 330 | //applet:IF_SH_IS_HUSH( APPLET_ODDNAME(sh, hush, BB_DIR_BIN, BB_SUID_DROP, hush)) |
| 331 | //applet:IF_BASH_IS_HUSH(APPLET_ODDNAME(bash, hush, BB_DIR_BIN, BB_SUID_DROP, hush)) |
| 332 | |
| 333 | //kbuild:lib-$(CONFIG_SHELL_HUSH) += hush.o match.o shell_common.o |
| 334 | //kbuild:lib-$(CONFIG_HUSH_RANDOM_SUPPORT) += random.o |
| 335 | |
| 336 | /* -i (interactive) is also accepted, |
| 337 | * but does nothing, therefore not shown in help. |
| 338 | * NOMMU-specific options are not meant to be used by users, |
| 339 | * therefore we don't show them either. |
| 340 | */ |
| 341 | //usage:#define hush_trivial_usage |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 342 | //usage: "[-enxl] [-c 'SCRIPT' [ARG0 ARGS] | FILE ARGS | -s ARGS]" |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 343 | //usage:#define hush_full_usage "\n\n" |
| 344 | //usage: "Unix shell interpreter" |
| 345 | |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 346 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 347 | #if !(defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) \ |
| 348 | || defined(__APPLE__) \ |
| 349 | ) |
| 350 | # include <malloc.h> /* for malloc_trim */ |
| 351 | #endif |
| 352 | #include <glob.h> |
| 353 | /* #include <dmalloc.h> */ |
| 354 | #if ENABLE_HUSH_CASE |
| 355 | # include <fnmatch.h> |
| 356 | #endif |
| 357 | #include <sys/times.h> |
| 358 | #include <sys/utsname.h> /* for setting $HOSTNAME */ |
| 359 | |
| 360 | #include "busybox.h" /* for APPLET_IS_NOFORK/NOEXEC */ |
| 361 | #include "unicode.h" |
| 362 | #include "shell_common.h" |
| 363 | #include "math.h" |
| 364 | #include "match.h" |
| 365 | #if ENABLE_HUSH_RANDOM_SUPPORT |
| 366 | # include "random.h" |
| 367 | #else |
| 368 | # define CLEAR_RANDOM_T(rnd) ((void)0) |
| 369 | #endif |
| 370 | #ifndef O_CLOEXEC |
| 371 | # define O_CLOEXEC 0 |
| 372 | #endif |
| 373 | #ifndef F_DUPFD_CLOEXEC |
| 374 | # define F_DUPFD_CLOEXEC F_DUPFD |
| 375 | #endif |
| 376 | |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 377 | #if ENABLE_FEATURE_SH_EMBEDDED_SCRIPTS && !ENABLE_SHELL_ASH |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 378 | # include "embedded_scripts.h" |
| 379 | #else |
| 380 | # define NUM_SCRIPTS 0 |
| 381 | #endif |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 382 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 383 | |
| 384 | /* So far, all bash compat is controlled by one config option */ |
| 385 | /* Separate defines document which part of code implements what */ |
| 386 | #define BASH_PATTERN_SUBST ENABLE_HUSH_BASH_COMPAT |
| 387 | #define BASH_SUBSTR ENABLE_HUSH_BASH_COMPAT |
| 388 | #define BASH_SOURCE ENABLE_HUSH_BASH_COMPAT |
| 389 | #define BASH_DOLLAR_SQUOTE ENABLE_HUSH_BASH_COMPAT |
| 390 | #define BASH_HOSTNAME_VAR ENABLE_HUSH_BASH_COMPAT |
| 391 | #define BASH_EPOCH_VARS ENABLE_HUSH_BASH_COMPAT |
| 392 | #define BASH_TEST2 (ENABLE_HUSH_BASH_COMPAT && ENABLE_HUSH_TEST) |
| 393 | #define BASH_READ_D ENABLE_HUSH_BASH_COMPAT |
| 394 | |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 395 | /* Build knobs */ |
| 396 | #define LEAK_HUNTING 0 |
| 397 | #define BUILD_AS_NOMMU 0 |
| 398 | /* Enable/disable sanity checks. Ok to enable in production, |
| 399 | * only adds a bit of bloat. Set to >1 to get non-production level verbosity. |
| 400 | * Keeping 1 for now even in released versions. |
| 401 | */ |
| 402 | #define HUSH_DEBUG 1 |
| 403 | /* Slightly bigger (+200 bytes), but faster hush. |
| 404 | * So far it only enables a trick with counting SIGCHLDs and forks, |
| 405 | * which allows us to do fewer waitpid's. |
| 406 | * (we can detect a case where neither forks were done nor SIGCHLDs happened |
| 407 | * and therefore waitpid will return the same result as last time) |
| 408 | */ |
| 409 | #define ENABLE_HUSH_FAST 0 |
| 410 | /* TODO: implement simplified code for users which do not need ${var%...} ops |
| 411 | * So far ${var%...} ops are always enabled: |
| 412 | */ |
| 413 | #define ENABLE_HUSH_DOLLAR_OPS 1 |
| 414 | |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 415 | #if BUILD_AS_NOMMU |
| 416 | # undef BB_MMU |
| 417 | # undef USE_FOR_NOMMU |
| 418 | # undef USE_FOR_MMU |
| 419 | # define BB_MMU 0 |
| 420 | # define USE_FOR_NOMMU(...) __VA_ARGS__ |
| 421 | # define USE_FOR_MMU(...) |
| 422 | #endif |
| 423 | |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 424 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 425 | #include "NUM_APPLETS.h" |
| 426 | #if NUM_APPLETS == 1 |
| 427 | /* STANDALONE does not make sense, and won't compile */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 428 | # undef ENABLE_FEATURE_SH_STANDALONE |
| 429 | # undef IF_FEATURE_SH_STANDALONE |
| 430 | # undef IF_NOT_FEATURE_SH_STANDALONE |
| 431 | # define ENABLE_FEATURE_SH_STANDALONE 0 |
| 432 | # define IF_FEATURE_SH_STANDALONE(...) |
| 433 | # define IF_NOT_FEATURE_SH_STANDALONE(...) __VA_ARGS__ |
| 434 | #endif |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 435 | #endif /* __U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 436 | |
| 437 | #if !ENABLE_HUSH_INTERACTIVE |
| 438 | # undef ENABLE_FEATURE_EDITING |
| 439 | # define ENABLE_FEATURE_EDITING 0 |
| 440 | # undef ENABLE_FEATURE_EDITING_FANCY_PROMPT |
| 441 | # define ENABLE_FEATURE_EDITING_FANCY_PROMPT 0 |
| 442 | # undef ENABLE_FEATURE_EDITING_SAVE_ON_EXIT |
| 443 | # define ENABLE_FEATURE_EDITING_SAVE_ON_EXIT 0 |
| 444 | #endif |
| 445 | |
| 446 | /* Do we support ANY keywords? */ |
| 447 | #if ENABLE_HUSH_IF || ENABLE_HUSH_LOOPS || ENABLE_HUSH_CASE |
| 448 | # define HAS_KEYWORDS 1 |
| 449 | # define IF_HAS_KEYWORDS(...) __VA_ARGS__ |
| 450 | # define IF_HAS_NO_KEYWORDS(...) |
| 451 | #else |
| 452 | # define HAS_KEYWORDS 0 |
| 453 | # define IF_HAS_KEYWORDS(...) |
| 454 | # define IF_HAS_NO_KEYWORDS(...) __VA_ARGS__ |
| 455 | #endif |
| 456 | |
| 457 | /* If you comment out one of these below, it will be #defined later |
| 458 | * to perform debug printfs to stderr: */ |
| 459 | #define debug_printf(...) do {} while (0) |
| 460 | /* Finer-grained debug switches */ |
| 461 | #define debug_printf_parse(...) do {} while (0) |
| 462 | #define debug_printf_heredoc(...) do {} while (0) |
| 463 | #define debug_print_tree(a, b) do {} while (0) |
| 464 | #define debug_printf_exec(...) do {} while (0) |
| 465 | #define debug_printf_env(...) do {} while (0) |
| 466 | #define debug_printf_jobs(...) do {} while (0) |
| 467 | #define debug_printf_expand(...) do {} while (0) |
| 468 | #define debug_printf_varexp(...) do {} while (0) |
| 469 | #define debug_printf_glob(...) do {} while (0) |
| 470 | #define debug_printf_redir(...) do {} while (0) |
| 471 | #define debug_printf_list(...) do {} while (0) |
| 472 | #define debug_printf_subst(...) do {} while (0) |
| 473 | #define debug_printf_prompt(...) do {} while (0) |
| 474 | #define debug_printf_clean(...) do {} while (0) |
| 475 | |
| 476 | #define ERR_PTR ((void*)(long)1) |
| 477 | |
| 478 | #define JOB_STATUS_FORMAT "[%u] %-22s %.40s\n" |
| 479 | |
| 480 | #define _SPECIAL_VARS_STR "_*@$!?#-" |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 481 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 482 | #define SPECIAL_VARS_STR ("_*@$!?#-" + 1) |
| 483 | #define NUMERIC_SPECVARS_STR ("_*@$!?#-" + 3) |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 484 | #else /* __U_BOOT__ */ |
| 485 | #define SPECIAL_VARS_STR "*@$!?#-" |
| 486 | #define NUMERIC_SPECVARS_STR "$!?#-" |
| 487 | #endif /* __U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 488 | #if BASH_PATTERN_SUBST |
| 489 | /* Support / and // replace ops */ |
| 490 | /* Note that // is stored as \ in "encoded" string representation */ |
| 491 | # define VAR_ENCODED_SUBST_OPS "\\/%#:-=+?" |
| 492 | # define VAR_SUBST_OPS ("\\/%#:-=+?" + 1) |
| 493 | # define MINUS_PLUS_EQUAL_QUESTION ("\\/%#:-=+?" + 5) |
| 494 | #else |
| 495 | # define VAR_ENCODED_SUBST_OPS "%#:-=+?" |
| 496 | # define VAR_SUBST_OPS "%#:-=+?" |
| 497 | # define MINUS_PLUS_EQUAL_QUESTION ("%#:-=+?" + 3) |
| 498 | #endif |
| 499 | |
| 500 | #define SPECIAL_VAR_SYMBOL_STR "\3" |
| 501 | #define SPECIAL_VAR_SYMBOL 3 |
| 502 | /* The "variable" with name "\1" emits string "\3". Testcase: "echo ^C" */ |
| 503 | #define SPECIAL_VAR_QUOTED_SVS 1 |
| 504 | |
| 505 | struct variable; |
| 506 | |
| 507 | static const char hush_version_str[] ALIGN1 = "HUSH_VERSION="BB_VER; |
| 508 | |
| 509 | /* This supports saving pointers malloced in vfork child, |
| 510 | * to be freed in the parent. |
| 511 | */ |
| 512 | #if !BB_MMU |
| 513 | typedef struct nommu_save_t { |
| 514 | struct variable *old_vars; |
| 515 | char **argv; |
| 516 | char **argv_from_re_execing; |
| 517 | } nommu_save_t; |
| 518 | #endif |
| 519 | |
| 520 | enum { |
| 521 | RES_NONE = 0, |
| 522 | #if ENABLE_HUSH_IF |
| 523 | RES_IF , |
| 524 | RES_THEN , |
| 525 | RES_ELIF , |
| 526 | RES_ELSE , |
| 527 | RES_FI , |
| 528 | #endif |
| 529 | #if ENABLE_HUSH_LOOPS |
| 530 | RES_FOR , |
| 531 | RES_WHILE , |
| 532 | RES_UNTIL , |
| 533 | RES_DO , |
| 534 | RES_DONE , |
| 535 | #endif |
| 536 | #if ENABLE_HUSH_LOOPS || ENABLE_HUSH_CASE |
| 537 | RES_IN , |
| 538 | #endif |
| 539 | #if ENABLE_HUSH_CASE |
| 540 | RES_CASE , |
| 541 | /* three pseudo-keywords support contrived "case" syntax: */ |
| 542 | RES_CASE_IN, /* "case ... IN", turns into RES_MATCH when IN is observed */ |
| 543 | RES_MATCH , /* "word)" */ |
| 544 | RES_CASE_BODY, /* "this command is inside CASE" */ |
| 545 | RES_ESAC , |
| 546 | #endif |
| 547 | RES_XXXX , |
| 548 | RES_SNTX |
| 549 | }; |
| 550 | |
| 551 | typedef struct o_string { |
| 552 | char *data; |
| 553 | int length; /* position where data is appended */ |
| 554 | int maxlen; |
| 555 | int o_expflags; |
| 556 | /* At least some part of the string was inside '' or "", |
| 557 | * possibly empty one: word"", wo''rd etc. */ |
| 558 | smallint has_quoted_part; |
| 559 | smallint has_empty_slot; |
| 560 | smallint ended_in_ifs; |
| 561 | } o_string; |
| 562 | enum { |
| 563 | EXP_FLAG_SINGLEWORD = 0x80, /* must be 0x80 */ |
| 564 | EXP_FLAG_GLOB = 0x2, |
| 565 | /* Protect newly added chars against globbing |
| 566 | * by prepending \ to *, ?, [, \ */ |
| 567 | EXP_FLAG_ESC_GLOB_CHARS = 0x1, |
| 568 | }; |
| 569 | /* Used for initialization: o_string foo = NULL_O_STRING; */ |
| 570 | #define NULL_O_STRING { NULL } |
| 571 | |
| 572 | #ifndef debug_printf_parse |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 573 | static const char *const assignment_flag[] ALIGN_PTR = { |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 574 | "MAYBE_ASSIGNMENT", |
| 575 | "DEFINITELY_ASSIGNMENT", |
| 576 | "NOT_ASSIGNMENT", |
| 577 | "WORD_IS_KEYWORD", |
| 578 | }; |
| 579 | #endif |
| 580 | |
| 581 | /* We almost can use standard FILE api, but we need an ability to move |
| 582 | * its fd when redirects coincide with it. No api exists for that |
| 583 | * (RFE for it at https://sourceware.org/bugzilla/show_bug.cgi?id=21902). |
| 584 | * HFILE is our internal alternative. Only supports reading. |
| 585 | * Since we now can, we incorporate linked list of all opened HFILEs |
| 586 | * into the struct (used to be a separate mini-list). |
| 587 | */ |
| 588 | typedef struct HFILE { |
| 589 | char *cur; |
| 590 | char *end; |
| 591 | struct HFILE *next_hfile; |
| 592 | int fd; |
| 593 | char buf[1024]; |
| 594 | } HFILE; |
| 595 | |
| 596 | typedef struct in_str { |
| 597 | const char *p; |
| 598 | int peek_buf[2]; |
| 599 | int last_char; |
| 600 | HFILE *file; |
| 601 | } in_str; |
| 602 | |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 603 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 604 | /* The descrip member of this structure is only used to make |
| 605 | * debugging output pretty */ |
| 606 | static const struct { |
| 607 | int32_t mode; |
| 608 | signed char default_fd; |
| 609 | char descrip[3]; |
| 610 | } redir_table[] ALIGN4 = { |
| 611 | { O_RDONLY, 0, "<" }, |
| 612 | { O_CREAT|O_TRUNC|O_WRONLY, 1, ">" }, |
| 613 | { O_CREAT|O_APPEND|O_WRONLY, 1, ">>" }, |
| 614 | { O_CREAT|O_RDWR, 1, "<>" }, |
| 615 | { O_RDONLY, 0, "<<" }, |
| 616 | /* Should not be needed. Bogus default_fd helps in debugging */ |
| 617 | /* { O_RDONLY, 77, "<<" }, */ |
| 618 | }; |
| 619 | |
| 620 | struct redir_struct { |
| 621 | struct redir_struct *next; |
| 622 | char *rd_filename; /* filename */ |
| 623 | int rd_fd; /* fd to redirect */ |
| 624 | /* fd to redirect to, or -3 if rd_fd is to be closed (n>&-) */ |
| 625 | int rd_dup; |
| 626 | smallint rd_type; /* (enum redir_type) */ |
| 627 | /* note: for heredocs, rd_filename contains heredoc delimiter, |
| 628 | * and subsequently heredoc itself; and rd_dup is a bitmask: |
| 629 | * bit 0: do we need to trim leading tabs? |
| 630 | * bit 1: is heredoc quoted (<<'delim' syntax) ? |
| 631 | */ |
| 632 | }; |
| 633 | typedef enum redir_type { |
| 634 | REDIRECT_INPUT = 0, |
| 635 | REDIRECT_OVERWRITE = 1, |
| 636 | REDIRECT_APPEND = 2, |
| 637 | REDIRECT_IO = 3, |
| 638 | REDIRECT_HEREDOC = 4, |
| 639 | REDIRECT_HEREDOC2 = 5, /* REDIRECT_HEREDOC after heredoc is loaded */ |
| 640 | |
| 641 | REDIRFD_CLOSE = -3, |
| 642 | REDIRFD_SYNTAX_ERR = -2, |
| 643 | REDIRFD_TO_FILE = -1, |
| 644 | /* otherwise, rd_fd is redirected to rd_dup */ |
| 645 | |
| 646 | HEREDOC_SKIPTABS = 1, |
| 647 | HEREDOC_QUOTED = 2, |
| 648 | } redir_type; |
| 649 | |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 650 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 651 | |
| 652 | struct command { |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 653 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 654 | pid_t pid; /* 0 if exited */ |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 655 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 656 | unsigned assignment_cnt; /* how many argv[i] are assignments? */ |
| 657 | #if ENABLE_HUSH_LINENO_VAR |
| 658 | unsigned lineno; |
| 659 | #endif |
| 660 | smallint cmd_type; /* CMD_xxx */ |
| 661 | #define CMD_NORMAL 0 |
| 662 | #define CMD_SUBSHELL 1 |
| 663 | #if BASH_TEST2 |
| 664 | /* used for "[[ EXPR ]]" */ |
| 665 | # define CMD_TEST2_SINGLEWORD_NOGLOB 2 |
| 666 | #endif |
| 667 | #if BASH_TEST2 || ENABLE_HUSH_LOCAL || ENABLE_HUSH_EXPORT || ENABLE_HUSH_READONLY |
| 668 | /* used to prevent word splitting and globbing in "export v=t*" */ |
| 669 | # define CMD_SINGLEWORD_NOGLOB 3 |
| 670 | #endif |
| 671 | #if ENABLE_HUSH_FUNCTIONS |
| 672 | # define CMD_FUNCDEF 4 |
| 673 | #endif |
| 674 | |
| 675 | smalluint cmd_exitcode; |
| 676 | /* if non-NULL, this "command" is { list }, ( list ), or a compound statement */ |
| 677 | struct pipe *group; |
| 678 | #if !BB_MMU |
| 679 | char *group_as_string; |
| 680 | #endif |
| 681 | #if ENABLE_HUSH_FUNCTIONS |
| 682 | struct function *child_func; |
| 683 | /* This field is used to prevent a bug here: |
| 684 | * while...do f1() {a;}; f1; f1() {b;}; f1; done |
| 685 | * When we execute "f1() {a;}" cmd, we create new function and clear |
| 686 | * cmd->group, cmd->group_as_string, cmd->argv[0]. |
| 687 | * When we execute "f1() {b;}", we notice that f1 exists, |
| 688 | * and that its "parent cmd" struct is still "alive", |
| 689 | * we put those fields back into cmd->xxx |
| 690 | * (struct function has ->parent_cmd ptr to facilitate that). |
| 691 | * When we loop back, we can execute "f1() {a;}" again and set f1 correctly. |
| 692 | * Without this trick, loop would execute a;b;b;b;... |
| 693 | * instead of correct sequence a;b;a;b;... |
| 694 | * When command is freed, it severs the link |
| 695 | * (sets ->child_func->parent_cmd to NULL). |
| 696 | */ |
| 697 | #endif |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 698 | #ifdef __U_BOOT__ |
| 699 | int argc; /* number of program arguments */ |
| 700 | #endif |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 701 | char **argv; /* command name and arguments */ |
| 702 | /* argv vector may contain variable references (^Cvar^C, ^C0^C etc) |
| 703 | * and on execution these are substituted with their values. |
| 704 | * Substitution can make _several_ words out of one argv[n]! |
| 705 | * Example: argv[0]=='.^C*^C.' here: echo .$*. |
| 706 | * References of the form ^C`cmd arg^C are `cmd arg` substitutions. |
| 707 | */ |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 708 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 709 | struct redir_struct *redirects; /* I/O redirections */ |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 710 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 711 | }; |
| 712 | /* Is there anything in this command at all? */ |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 713 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 714 | #define IS_NULL_CMD(cmd) \ |
| 715 | (!(cmd)->group && !(cmd)->argv && !(cmd)->redirects) |
| 716 | |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 717 | #else /* __U_BOOT__ */ |
| 718 | #define IS_NULL_CMD(cmd) \ |
| 719 | (!(cmd)->group && !(cmd)->argv) |
| 720 | #endif /* __U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 721 | struct pipe { |
| 722 | struct pipe *next; |
| 723 | int num_cmds; /* total number of commands in pipe */ |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 724 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 725 | int alive_cmds; /* number of commands running (not exited) */ |
| 726 | int stopped_cmds; /* number of commands alive, but stopped */ |
| 727 | #if ENABLE_HUSH_JOB |
| 728 | unsigned jobid; /* job number */ |
| 729 | pid_t pgrp; /* process group ID for the job */ |
| 730 | char *cmdtext; /* name of job */ |
| 731 | #endif |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 732 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 733 | struct command *cmds; /* array of commands in pipe */ |
| 734 | smallint followup; /* PIPE_BG, PIPE_SEQ, PIPE_OR, PIPE_AND */ |
| 735 | IF_HAS_KEYWORDS(smallint pi_inverted;) /* "! cmd | cmd" */ |
| 736 | IF_HAS_KEYWORDS(smallint res_word;) /* needed for if, for, while, until... */ |
| 737 | }; |
| 738 | typedef enum pipe_style { |
| 739 | PIPE_SEQ = 0, |
| 740 | PIPE_AND = 1, |
| 741 | PIPE_OR = 2, |
| 742 | PIPE_BG = 3, |
| 743 | } pipe_style; |
| 744 | /* Is there anything in this pipe at all? */ |
| 745 | #define IS_NULL_PIPE(pi) \ |
| 746 | ((pi)->num_cmds == 0 IF_HAS_KEYWORDS( && (pi)->res_word == RES_NONE)) |
| 747 | |
| 748 | /* This holds pointers to the various results of parsing */ |
| 749 | struct parse_context { |
| 750 | /* linked list of pipes */ |
| 751 | struct pipe *list_head; |
| 752 | /* last pipe (being constructed right now) */ |
| 753 | struct pipe *pipe; |
| 754 | /* last command in pipe (being constructed right now) */ |
| 755 | struct command *command; |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 756 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 757 | /* last redirect in command->redirects list */ |
| 758 | struct redir_struct *pending_redirect; |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 759 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 760 | o_string word; |
| 761 | #if !BB_MMU |
| 762 | o_string as_string; |
| 763 | #endif |
| 764 | smallint is_assignment; /* 0:maybe, 1:yes, 2:no, 3:keyword */ |
| 765 | #if HAS_KEYWORDS |
| 766 | smallint ctx_res_w; |
| 767 | smallint ctx_inverted; /* "! cmd | cmd" */ |
| 768 | #if ENABLE_HUSH_CASE |
| 769 | smallint ctx_dsemicolon; /* ";;" seen */ |
| 770 | #endif |
| 771 | /* bitmask of FLAG_xxx, for figuring out valid reserved words */ |
| 772 | int old_flag; |
| 773 | /* group we are enclosed in: |
| 774 | * example: "if pipe1; pipe2; then pipe3; fi" |
| 775 | * when we see "if" or "then", we malloc and copy current context, |
| 776 | * and make ->stack point to it. then we parse pipeN. |
| 777 | * when closing "then" / fi" / whatever is found, |
| 778 | * we move list_head into ->stack->command->group, |
| 779 | * copy ->stack into current context, and delete ->stack. |
| 780 | * (parsing of { list } and ( list ) doesn't use this method) |
| 781 | */ |
| 782 | struct parse_context *stack; |
| 783 | #endif |
| 784 | }; |
| 785 | enum { |
| 786 | MAYBE_ASSIGNMENT = 0, |
| 787 | DEFINITELY_ASSIGNMENT = 1, |
| 788 | NOT_ASSIGNMENT = 2, |
| 789 | /* Not an assignment, but next word may be: "if v=xyz cmd;" */ |
| 790 | WORD_IS_KEYWORD = 3, |
| 791 | }; |
| 792 | |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 793 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 794 | /* On program start, environ points to initial environment. |
| 795 | * putenv adds new pointers into it, unsetenv removes them. |
| 796 | * Neither of these (de)allocates the strings. |
| 797 | * setenv allocates new strings in malloc space and does putenv, |
| 798 | * and thus setenv is unusable (leaky) for shell's purposes */ |
| 799 | #define setenv(...) setenv_is_leaky_dont_use() |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 800 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 801 | struct variable { |
| 802 | struct variable *next; |
| 803 | char *varstr; /* points to "name=" portion */ |
| 804 | int max_len; /* if > 0, name is part of initial env; else name is malloced */ |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 805 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 806 | uint16_t var_nest_level; |
| 807 | smallint flg_export; /* putenv should be done on this var */ |
| 808 | smallint flg_read_only; |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 809 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 810 | }; |
| 811 | |
| 812 | enum { |
| 813 | BC_BREAK = 1, |
| 814 | BC_CONTINUE = 2, |
| 815 | }; |
| 816 | |
| 817 | #if ENABLE_HUSH_FUNCTIONS |
| 818 | struct function { |
| 819 | struct function *next; |
| 820 | char *name; |
| 821 | struct command *parent_cmd; |
| 822 | struct pipe *body; |
| 823 | # if !BB_MMU |
| 824 | char *body_as_string; |
| 825 | # endif |
| 826 | }; |
| 827 | #endif |
| 828 | |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 829 | /* set -/+o OPT support. (TODO: make it optional) |
| 830 | * bash supports the following opts: |
| 831 | * allexport off |
| 832 | * braceexpand on |
| 833 | * emacs on |
| 834 | * errexit off |
| 835 | * errtrace off |
| 836 | * functrace off |
| 837 | * hashall on |
| 838 | * histexpand off |
| 839 | * history on |
| 840 | * ignoreeof off |
| 841 | * interactive-comments on |
| 842 | * keyword off |
| 843 | * monitor on |
| 844 | * noclobber off |
| 845 | * noexec off |
| 846 | * noglob off |
| 847 | * nolog off |
| 848 | * notify off |
| 849 | * nounset off |
| 850 | * onecmd off |
| 851 | * physical off |
| 852 | * pipefail off |
| 853 | * posix off |
| 854 | * privileged off |
| 855 | * verbose off |
| 856 | * vi off |
| 857 | * xtrace off |
| 858 | */ |
| 859 | static const char o_opt_strings[] ALIGN1 = |
| 860 | "pipefail\0" |
| 861 | "noexec\0" |
| 862 | "errexit\0" |
| 863 | #if ENABLE_HUSH_MODE_X |
| 864 | "xtrace\0" |
| 865 | #endif |
| 866 | ; |
| 867 | enum { |
| 868 | OPT_O_PIPEFAIL, |
| 869 | OPT_O_NOEXEC, |
| 870 | OPT_O_ERREXIT, |
| 871 | #if ENABLE_HUSH_MODE_X |
| 872 | OPT_O_XTRACE, |
| 873 | #endif |
| 874 | NUM_OPT_O |
| 875 | }; |
| 876 | |
| 877 | /* "Globals" within this file */ |
| 878 | /* Sorted roughly by size (smaller offsets == smaller code) */ |
| 879 | struct globals { |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 880 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 881 | /* interactive_fd != 0 means we are an interactive shell. |
| 882 | * If we are, then saved_tty_pgrp can also be != 0, meaning |
| 883 | * that controlling tty is available. With saved_tty_pgrp == 0, |
| 884 | * job control still works, but terminal signals |
| 885 | * (^C, ^Z, ^Y, ^\) won't work at all, and background |
| 886 | * process groups can only be created with "cmd &". |
| 887 | * With saved_tty_pgrp != 0, hush will use tcsetpgrp() |
| 888 | * to give tty to the foreground process group, |
| 889 | * and will take it back when the group is stopped (^Z) |
| 890 | * or killed (^C). |
| 891 | */ |
| 892 | #if ENABLE_HUSH_INTERACTIVE |
| 893 | /* 'interactive_fd' is a fd# open to ctty, if we have one |
| 894 | * _AND_ if we decided to act interactively */ |
| 895 | int interactive_fd; |
| 896 | IF_NOT_FEATURE_EDITING_FANCY_PROMPT(char *PS1;) |
| 897 | # define G_interactive_fd (G.interactive_fd) |
| 898 | #else |
| 899 | # define G_interactive_fd 0 |
| 900 | #endif |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 901 | #else /* __U_BOOT__ */ |
| 902 | # define G_interactive_fd 0 |
| 903 | #endif /* __U_BOOT__ */ |
| 904 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 905 | #if ENABLE_FEATURE_EDITING |
| 906 | line_input_t *line_input_state; |
| 907 | #endif |
| 908 | pid_t root_pid; |
| 909 | pid_t root_ppid; |
| 910 | pid_t last_bg_pid; |
| 911 | #if ENABLE_HUSH_RANDOM_SUPPORT |
| 912 | random_t random_gen; |
| 913 | #endif |
| 914 | #if ENABLE_HUSH_JOB |
| 915 | int run_list_level; |
| 916 | unsigned last_jobid; |
| 917 | pid_t saved_tty_pgrp; |
| 918 | struct pipe *job_list; |
| 919 | # define G_saved_tty_pgrp (G.saved_tty_pgrp) |
| 920 | #else |
| 921 | # define G_saved_tty_pgrp 0 |
| 922 | #endif |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 923 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 924 | /* How deeply are we in context where "set -e" is ignored */ |
| 925 | int errexit_depth; |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 926 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 927 | /* "set -e" rules (do we follow them correctly?): |
| 928 | * Exit if pipe, list, or compound command exits with a non-zero status. |
| 929 | * Shell does not exit if failed command is part of condition in |
| 930 | * if/while, part of && or || list except the last command, any command |
| 931 | * in a pipe but the last, or if the command's return value is being |
| 932 | * inverted with !. If a compound command other than a subshell returns a |
| 933 | * non-zero status because a command failed while -e was being ignored, the |
| 934 | * shell does not exit. A trap on ERR, if set, is executed before the shell |
| 935 | * exits [ERR is a bashism]. |
| 936 | * |
| 937 | * If a compound command or function executes in a context where -e is |
| 938 | * ignored, none of the commands executed within are affected by the -e |
| 939 | * setting. If a compound command or function sets -e while executing in a |
| 940 | * context where -e is ignored, that setting does not have any effect until |
| 941 | * the compound command or the command containing the function call completes. |
| 942 | */ |
| 943 | |
| 944 | char o_opt[NUM_OPT_O]; |
| 945 | #if ENABLE_HUSH_MODE_X |
| 946 | # define G_x_mode (G.o_opt[OPT_O_XTRACE]) |
| 947 | #else |
| 948 | # define G_x_mode 0 |
| 949 | #endif |
| 950 | char opt_s; |
| 951 | char opt_c; |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 952 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 953 | #if ENABLE_HUSH_INTERACTIVE |
| 954 | smallint promptmode; /* 0: PS1, 1: PS2 */ |
| 955 | #endif |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 956 | /* set by signal handler if SIGINT is received _and_ its trap is not set */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 957 | smallint flag_SIGINT; |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 958 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 959 | #if ENABLE_HUSH_LOOPS |
| 960 | smallint flag_break_continue; |
| 961 | #endif |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 962 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 963 | #if ENABLE_HUSH_FUNCTIONS |
| 964 | /* 0: outside of a function (or sourced file) |
| 965 | * -1: inside of a function, ok to use return builtin |
| 966 | * 1: return is invoked, skip all till end of func |
| 967 | */ |
| 968 | smallint flag_return_in_progress; |
| 969 | # define G_flag_return_in_progress (G.flag_return_in_progress) |
| 970 | #else |
| 971 | # define G_flag_return_in_progress 0 |
| 972 | #endif |
| 973 | smallint exiting; /* used to prevent EXIT trap recursion */ |
| 974 | /* These support $? */ |
| 975 | smalluint last_exitcode; |
| 976 | smalluint expand_exitcode; |
| 977 | smalluint last_bg_pid_exitcode; |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 978 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 979 | #if ENABLE_HUSH_SET |
| 980 | /* are global_argv and global_argv[1..n] malloced? (note: not [0]) */ |
| 981 | smalluint global_args_malloced; |
| 982 | # define G_global_args_malloced (G.global_args_malloced) |
| 983 | #else |
| 984 | # define G_global_args_malloced 0 |
| 985 | #endif |
| 986 | #if ENABLE_HUSH_BASH_COMPAT |
| 987 | int dead_job_exitcode; /* for "wait -n" */ |
| 988 | #endif |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 989 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 990 | /* how many non-NULL argv's we have. NB: $# + 1 */ |
| 991 | int global_argc; |
| 992 | char **global_argv; |
| 993 | #if !BB_MMU |
| 994 | char *argv0_for_re_execing; |
| 995 | #endif |
| 996 | #if ENABLE_HUSH_LOOPS |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 997 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 998 | unsigned depth_break_continue; |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 999 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 1000 | unsigned depth_of_loop; |
| 1001 | #endif |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 1002 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 1003 | #if ENABLE_HUSH_GETOPTS |
| 1004 | unsigned getopt_count; |
| 1005 | #endif |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 1006 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 1007 | const char *ifs; |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 1008 | #ifdef __U_BOOT__ |
| 1009 | int flag_repeat; |
| 1010 | int do_repeat; |
Francis Laniel | 3b13faf | 2023-12-22 22:02:34 +0100 | [diff] [blame] | 1011 | int run_command_flags; |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 1012 | #endif /* __U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 1013 | char *ifs_whitespace; /* = G.ifs or malloced */ |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 1014 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 1015 | const char *cwd; |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 1016 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 1017 | struct variable *top_var; |
| 1018 | char **expanded_assignments; |
| 1019 | struct variable **shadowed_vars_pp; |
| 1020 | unsigned var_nest_level; |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 1021 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 1022 | #if ENABLE_HUSH_FUNCTIONS |
| 1023 | # if ENABLE_HUSH_LOCAL |
| 1024 | unsigned func_nest_level; /* solely to prevent "local v" in non-functions */ |
| 1025 | # endif |
| 1026 | struct function *top_func; |
| 1027 | #endif |
| 1028 | /* Signal and trap handling */ |
| 1029 | #if ENABLE_HUSH_FAST |
| 1030 | unsigned count_SIGCHLD; |
| 1031 | unsigned handled_SIGCHLD; |
| 1032 | smallint we_have_children; |
| 1033 | #endif |
| 1034 | #if ENABLE_HUSH_LINENO_VAR |
| 1035 | unsigned parse_lineno; |
| 1036 | unsigned execute_lineno; |
| 1037 | #endif |
| 1038 | HFILE *HFILE_list; |
| 1039 | HFILE *HFILE_stdin; |
| 1040 | /* Which signals have non-DFL handler (even with no traps set)? |
| 1041 | * Set at the start to: |
| 1042 | * (SIGQUIT + maybe SPECIAL_INTERACTIVE_SIGS + maybe SPECIAL_JOBSTOP_SIGS) |
| 1043 | * SPECIAL_INTERACTIVE_SIGS are cleared after fork. |
| 1044 | * The rest is cleared right before execv syscalls. |
| 1045 | * Other than these two times, never modified. |
| 1046 | */ |
| 1047 | unsigned special_sig_mask; |
| 1048 | #if ENABLE_HUSH_JOB |
| 1049 | unsigned fatal_sig_mask; |
| 1050 | # define G_fatal_sig_mask (G.fatal_sig_mask) |
| 1051 | #else |
| 1052 | # define G_fatal_sig_mask 0 |
| 1053 | #endif |
| 1054 | #if ENABLE_HUSH_TRAP |
| 1055 | int pre_trap_exitcode; |
| 1056 | # if ENABLE_HUSH_FUNCTIONS |
| 1057 | int return_exitcode; |
| 1058 | # endif |
| 1059 | char **traps; /* char *traps[NSIG] */ |
| 1060 | # define G_traps G.traps |
| 1061 | #else |
| 1062 | # define G_traps ((char**)NULL) |
| 1063 | #endif |
| 1064 | sigset_t pending_set; |
| 1065 | #if ENABLE_HUSH_MEMLEAK |
| 1066 | unsigned long memleak_value; |
| 1067 | #endif |
| 1068 | #if ENABLE_HUSH_MODE_X |
| 1069 | unsigned x_mode_depth; |
| 1070 | /* "set -x" output should not be redirectable with subsequent 2>FILE. |
| 1071 | * We dup fd#2 to x_mode_fd when "set -x" is executed, and use it |
| 1072 | * for all subsequent output. |
| 1073 | */ |
| 1074 | int x_mode_fd; |
| 1075 | o_string x_mode_buf; |
| 1076 | #endif |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 1077 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 1078 | #if HUSH_DEBUG >= 2 |
| 1079 | int debug_indent; |
| 1080 | #endif |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 1081 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 1082 | struct sigaction sa; |
| 1083 | char optstring_buf[sizeof("eixcs")]; |
| 1084 | #if BASH_EPOCH_VARS |
| 1085 | char epoch_buf[sizeof("%llu.nnnnnn") + sizeof(long long)*3]; |
| 1086 | #endif |
| 1087 | #if ENABLE_FEATURE_EDITING |
| 1088 | char user_input_buf[CONFIG_FEATURE_EDITING_MAX_LEN]; |
| 1089 | #endif |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 1090 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 1091 | }; |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 1092 | #ifdef __U_BOOT__ |
| 1093 | struct globals *ptr_to_globals; |
| 1094 | #endif /* __U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 1095 | #define G (*ptr_to_globals) |
| 1096 | /* Not #defining name to G.name - this quickly gets unwieldy |
| 1097 | * (too many defines). Also, I actually prefer to see when a variable |
| 1098 | * is global, thus "G." prefix is a useful hint */ |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 1099 | #ifdef __U_BOOT__ |
| 1100 | #define SET_PTR_TO_GLOBALS(x) do { \ |
| 1101 | (*(struct globals**)&ptr_to_globals) = (void*)(x); \ |
| 1102 | barrier(); \ |
| 1103 | } while (0) |
| 1104 | #define INIT_G() do { \ |
| 1105 | SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \ |
| 1106 | G.promptmode = 1; \ |
| 1107 | } while (0) |
| 1108 | #else /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 1109 | #define INIT_G() do { \ |
| 1110 | SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \ |
| 1111 | /* memset(&G.sa, 0, sizeof(G.sa)); */ \ |
| 1112 | sigfillset(&G.sa.sa_mask); \ |
| 1113 | G.sa.sa_flags = SA_RESTART; \ |
| 1114 | } while (0) |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 1115 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 1116 | |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 1117 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 1118 | /* Function prototypes for builtins */ |
| 1119 | static int builtin_cd(char **argv) FAST_FUNC; |
| 1120 | #if ENABLE_HUSH_ECHO |
| 1121 | static int builtin_echo(char **argv) FAST_FUNC; |
| 1122 | #endif |
| 1123 | static int builtin_eval(char **argv) FAST_FUNC; |
| 1124 | static int builtin_exec(char **argv) FAST_FUNC; |
| 1125 | static int builtin_exit(char **argv) FAST_FUNC; |
| 1126 | #if ENABLE_HUSH_EXPORT |
| 1127 | static int builtin_export(char **argv) FAST_FUNC; |
| 1128 | #endif |
| 1129 | #if ENABLE_HUSH_READONLY |
| 1130 | static int builtin_readonly(char **argv) FAST_FUNC; |
| 1131 | #endif |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 1132 | static int builtin_false(char **argv) FAST_FUNC; |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 1133 | #if ENABLE_HUSH_JOB |
| 1134 | static int builtin_fg_bg(char **argv) FAST_FUNC; |
| 1135 | static int builtin_jobs(char **argv) FAST_FUNC; |
| 1136 | #endif |
| 1137 | #if ENABLE_HUSH_GETOPTS |
| 1138 | static int builtin_getopts(char **argv) FAST_FUNC; |
| 1139 | #endif |
| 1140 | #if ENABLE_HUSH_HELP |
| 1141 | static int builtin_help(char **argv) FAST_FUNC; |
| 1142 | #endif |
| 1143 | #if MAX_HISTORY && ENABLE_FEATURE_EDITING |
| 1144 | static int builtin_history(char **argv) FAST_FUNC; |
| 1145 | #endif |
| 1146 | #if ENABLE_HUSH_LOCAL |
| 1147 | static int builtin_local(char **argv) FAST_FUNC; |
| 1148 | #endif |
| 1149 | #if ENABLE_HUSH_MEMLEAK |
| 1150 | static int builtin_memleak(char **argv) FAST_FUNC; |
| 1151 | #endif |
| 1152 | #if ENABLE_HUSH_PRINTF |
| 1153 | static int builtin_printf(char **argv) FAST_FUNC; |
| 1154 | #endif |
| 1155 | static int builtin_pwd(char **argv) FAST_FUNC; |
| 1156 | #if ENABLE_HUSH_READ |
| 1157 | static int builtin_read(char **argv) FAST_FUNC; |
| 1158 | #endif |
| 1159 | #if ENABLE_HUSH_SET |
| 1160 | static int builtin_set(char **argv) FAST_FUNC; |
| 1161 | #endif |
| 1162 | static int builtin_shift(char **argv) FAST_FUNC; |
| 1163 | static int builtin_source(char **argv) FAST_FUNC; |
| 1164 | #if ENABLE_HUSH_TEST || BASH_TEST2 |
| 1165 | static int builtin_test(char **argv) FAST_FUNC; |
| 1166 | #endif |
| 1167 | #if ENABLE_HUSH_TRAP |
| 1168 | static int builtin_trap(char **argv) FAST_FUNC; |
| 1169 | #endif |
| 1170 | #if ENABLE_HUSH_TYPE |
| 1171 | static int builtin_type(char **argv) FAST_FUNC; |
| 1172 | #endif |
| 1173 | #if ENABLE_HUSH_TIMES |
| 1174 | static int builtin_times(char **argv) FAST_FUNC; |
| 1175 | #endif |
| 1176 | static int builtin_true(char **argv) FAST_FUNC; |
| 1177 | #if ENABLE_HUSH_UMASK |
| 1178 | static int builtin_umask(char **argv) FAST_FUNC; |
| 1179 | #endif |
| 1180 | #if ENABLE_HUSH_UNSET |
| 1181 | static int builtin_unset(char **argv) FAST_FUNC; |
| 1182 | #endif |
| 1183 | #if ENABLE_HUSH_KILL |
| 1184 | static int builtin_kill(char **argv) FAST_FUNC; |
| 1185 | #endif |
| 1186 | #if ENABLE_HUSH_WAIT |
| 1187 | static int builtin_wait(char **argv) FAST_FUNC; |
| 1188 | #endif |
| 1189 | #if ENABLE_HUSH_LOOPS |
| 1190 | static int builtin_break(char **argv) FAST_FUNC; |
| 1191 | static int builtin_continue(char **argv) FAST_FUNC; |
| 1192 | #endif |
| 1193 | #if ENABLE_HUSH_FUNCTIONS |
| 1194 | static int builtin_return(char **argv) FAST_FUNC; |
| 1195 | #endif |
| 1196 | |
| 1197 | /* Table of built-in functions. They can be forked or not, depending on |
| 1198 | * context: within pipes, they fork. As simple commands, they do not. |
| 1199 | * When used in non-forking context, they can change global variables |
| 1200 | * in the parent shell process. If forked, of course they cannot. |
| 1201 | * For example, 'unset foo | whatever' will parse and run, but foo will |
| 1202 | * still be set at the end. */ |
| 1203 | struct built_in_command { |
| 1204 | const char *b_cmd; |
| 1205 | int (*b_function)(char **argv) FAST_FUNC; |
| 1206 | #if ENABLE_HUSH_HELP |
| 1207 | const char *b_descr; |
| 1208 | # define BLTIN(cmd, func, help) { cmd, func, help } |
| 1209 | #else |
| 1210 | # define BLTIN(cmd, func, help) { cmd, func } |
| 1211 | #endif |
| 1212 | }; |
| 1213 | |
| 1214 | static const struct built_in_command bltins1[] ALIGN_PTR = { |
| 1215 | BLTIN("." , builtin_source , "Run commands in file"), |
| 1216 | BLTIN(":" , builtin_true , NULL), |
| 1217 | #if ENABLE_HUSH_JOB |
| 1218 | BLTIN("bg" , builtin_fg_bg , "Resume job in background"), |
| 1219 | #endif |
| 1220 | #if ENABLE_HUSH_LOOPS |
| 1221 | BLTIN("break" , builtin_break , "Exit loop"), |
| 1222 | #endif |
| 1223 | BLTIN("cd" , builtin_cd , "Change directory"), |
| 1224 | #if ENABLE_HUSH_LOOPS |
| 1225 | BLTIN("continue" , builtin_continue, "Start new loop iteration"), |
| 1226 | #endif |
| 1227 | BLTIN("eval" , builtin_eval , "Construct and run shell command"), |
| 1228 | BLTIN("exec" , builtin_exec , "Execute command, don't return to shell"), |
| 1229 | BLTIN("exit" , builtin_exit , NULL), |
| 1230 | #if ENABLE_HUSH_EXPORT |
| 1231 | BLTIN("export" , builtin_export , "Set environment variables"), |
| 1232 | #endif |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 1233 | BLTIN("false" , builtin_false , NULL), |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 1234 | #if ENABLE_HUSH_JOB |
| 1235 | BLTIN("fg" , builtin_fg_bg , "Bring job to foreground"), |
| 1236 | #endif |
| 1237 | #if ENABLE_HUSH_GETOPTS |
| 1238 | BLTIN("getopts" , builtin_getopts , NULL), |
| 1239 | #endif |
| 1240 | #if ENABLE_HUSH_HELP |
| 1241 | BLTIN("help" , builtin_help , NULL), |
| 1242 | #endif |
| 1243 | #if MAX_HISTORY && ENABLE_FEATURE_EDITING |
| 1244 | BLTIN("history" , builtin_history , "Show history"), |
| 1245 | #endif |
| 1246 | #if ENABLE_HUSH_JOB |
| 1247 | BLTIN("jobs" , builtin_jobs , "List jobs"), |
| 1248 | #endif |
| 1249 | #if ENABLE_HUSH_KILL |
| 1250 | BLTIN("kill" , builtin_kill , "Send signals to processes"), |
| 1251 | #endif |
| 1252 | #if ENABLE_HUSH_LOCAL |
| 1253 | BLTIN("local" , builtin_local , "Set local variables"), |
| 1254 | #endif |
| 1255 | #if ENABLE_HUSH_MEMLEAK |
| 1256 | BLTIN("memleak" , builtin_memleak , NULL), |
| 1257 | #endif |
| 1258 | #if ENABLE_HUSH_READ |
| 1259 | BLTIN("read" , builtin_read , "Input into variable"), |
| 1260 | #endif |
| 1261 | #if ENABLE_HUSH_READONLY |
| 1262 | BLTIN("readonly" , builtin_readonly, "Make variables read-only"), |
| 1263 | #endif |
| 1264 | #if ENABLE_HUSH_FUNCTIONS |
| 1265 | BLTIN("return" , builtin_return , "Return from function"), |
| 1266 | #endif |
| 1267 | #if ENABLE_HUSH_SET |
| 1268 | BLTIN("set" , builtin_set , "Set positional parameters"), |
| 1269 | #endif |
| 1270 | BLTIN("shift" , builtin_shift , "Shift positional parameters"), |
| 1271 | #if BASH_SOURCE |
| 1272 | BLTIN("source" , builtin_source , NULL), |
| 1273 | #endif |
| 1274 | #if ENABLE_HUSH_TIMES |
| 1275 | BLTIN("times" , builtin_times , NULL), |
| 1276 | #endif |
| 1277 | #if ENABLE_HUSH_TRAP |
| 1278 | BLTIN("trap" , builtin_trap , "Trap signals"), |
| 1279 | #endif |
| 1280 | BLTIN("true" , builtin_true , NULL), |
| 1281 | #if ENABLE_HUSH_TYPE |
| 1282 | BLTIN("type" , builtin_type , "Show command type"), |
| 1283 | #endif |
| 1284 | #if ENABLE_HUSH_ULIMIT |
| 1285 | BLTIN("ulimit" , shell_builtin_ulimit, "Control resource limits"), |
| 1286 | #endif |
| 1287 | #if ENABLE_HUSH_UMASK |
| 1288 | BLTIN("umask" , builtin_umask , "Set file creation mask"), |
| 1289 | #endif |
| 1290 | #if ENABLE_HUSH_UNSET |
| 1291 | BLTIN("unset" , builtin_unset , "Unset variables"), |
| 1292 | #endif |
| 1293 | #if ENABLE_HUSH_WAIT |
| 1294 | BLTIN("wait" , builtin_wait , "Wait for process to finish"), |
| 1295 | #endif |
| 1296 | }; |
| 1297 | /* These builtins won't be used if we are on NOMMU and need to re-exec |
| 1298 | * (it's cheaper to run an external program in this case): |
| 1299 | */ |
| 1300 | static const struct built_in_command bltins2[] ALIGN_PTR = { |
| 1301 | #if ENABLE_HUSH_TEST |
| 1302 | BLTIN("[" , builtin_test , NULL), |
| 1303 | #endif |
| 1304 | #if BASH_TEST2 |
| 1305 | BLTIN("[[" , builtin_test , NULL), |
| 1306 | #endif |
| 1307 | #if ENABLE_HUSH_ECHO |
| 1308 | BLTIN("echo" , builtin_echo , NULL), |
| 1309 | #endif |
| 1310 | #if ENABLE_HUSH_PRINTF |
| 1311 | BLTIN("printf" , builtin_printf , NULL), |
| 1312 | #endif |
| 1313 | BLTIN("pwd" , builtin_pwd , NULL), |
| 1314 | #if ENABLE_HUSH_TEST |
| 1315 | BLTIN("test" , builtin_test , NULL), |
| 1316 | #endif |
| 1317 | }; |
| 1318 | |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 1319 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 1320 | |
| 1321 | /* Debug printouts. |
| 1322 | */ |
| 1323 | #if HUSH_DEBUG >= 2 |
| 1324 | /* prevent disasters with G.debug_indent < 0 */ |
| 1325 | # define indent() fdprintf(2, "%*s", (G.debug_indent * 2) & 0xff, "") |
| 1326 | # define debug_enter() (G.debug_indent++) |
| 1327 | # define debug_leave() (G.debug_indent--) |
| 1328 | #else |
| 1329 | # define indent() ((void)0) |
| 1330 | # define debug_enter() ((void)0) |
| 1331 | # define debug_leave() ((void)0) |
| 1332 | #endif |
| 1333 | |
| 1334 | #ifndef debug_printf |
| 1335 | # define debug_printf(...) (indent(), fdprintf(2, __VA_ARGS__)) |
| 1336 | #endif |
| 1337 | |
| 1338 | #ifndef debug_printf_parse |
| 1339 | # define debug_printf_parse(...) (indent(), fdprintf(2, __VA_ARGS__)) |
| 1340 | #endif |
| 1341 | |
| 1342 | #ifndef debug_printf_heredoc |
| 1343 | # define debug_printf_heredoc(...) (indent(), fdprintf(2, __VA_ARGS__)) |
| 1344 | #endif |
| 1345 | |
| 1346 | #ifndef debug_printf_exec |
| 1347 | #define debug_printf_exec(...) (indent(), fdprintf(2, __VA_ARGS__)) |
| 1348 | #endif |
| 1349 | |
| 1350 | #ifndef debug_printf_env |
| 1351 | # define debug_printf_env(...) (indent(), fdprintf(2, __VA_ARGS__)) |
| 1352 | #endif |
| 1353 | |
| 1354 | #ifndef debug_printf_jobs |
| 1355 | # define debug_printf_jobs(...) (indent(), fdprintf(2, __VA_ARGS__)) |
| 1356 | # define DEBUG_JOBS 1 |
| 1357 | #else |
| 1358 | # define DEBUG_JOBS 0 |
| 1359 | #endif |
| 1360 | |
| 1361 | #ifndef debug_printf_expand |
| 1362 | # define debug_printf_expand(...) (indent(), fdprintf(2, __VA_ARGS__)) |
| 1363 | # define DEBUG_EXPAND 1 |
| 1364 | #else |
| 1365 | # define DEBUG_EXPAND 0 |
| 1366 | #endif |
| 1367 | |
| 1368 | #ifndef debug_printf_varexp |
| 1369 | # define debug_printf_varexp(...) (indent(), fdprintf(2, __VA_ARGS__)) |
| 1370 | #endif |
| 1371 | |
| 1372 | #ifndef debug_printf_glob |
| 1373 | # define debug_printf_glob(...) (indent(), fdprintf(2, __VA_ARGS__)) |
| 1374 | # define DEBUG_GLOB 1 |
| 1375 | #else |
| 1376 | # define DEBUG_GLOB 0 |
| 1377 | #endif |
| 1378 | |
| 1379 | #ifndef debug_printf_redir |
| 1380 | # define debug_printf_redir(...) (indent(), fdprintf(2, __VA_ARGS__)) |
| 1381 | #endif |
| 1382 | |
| 1383 | #ifndef debug_printf_list |
| 1384 | # define debug_printf_list(...) (indent(), fdprintf(2, __VA_ARGS__)) |
| 1385 | #endif |
| 1386 | |
| 1387 | #ifndef debug_printf_subst |
| 1388 | # define debug_printf_subst(...) (indent(), fdprintf(2, __VA_ARGS__)) |
| 1389 | #endif |
| 1390 | |
| 1391 | #ifndef debug_printf_prompt |
| 1392 | # define debug_printf_prompt(...) (indent(), fdprintf(2, __VA_ARGS__)) |
| 1393 | #endif |
| 1394 | |
| 1395 | #ifndef debug_printf_clean |
| 1396 | # define debug_printf_clean(...) (indent(), fdprintf(2, __VA_ARGS__)) |
| 1397 | # define DEBUG_CLEAN 1 |
| 1398 | #else |
| 1399 | # define DEBUG_CLEAN 0 |
| 1400 | #endif |
| 1401 | |
| 1402 | #if DEBUG_EXPAND |
| 1403 | static void debug_print_strings(const char *prefix, char **vv) |
| 1404 | { |
| 1405 | indent(); |
| 1406 | fdprintf(2, "%s:\n", prefix); |
| 1407 | while (*vv) |
| 1408 | fdprintf(2, " '%s'\n", *vv++); |
| 1409 | } |
| 1410 | #else |
| 1411 | # define debug_print_strings(prefix, vv) ((void)0) |
| 1412 | #endif |
| 1413 | |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 1414 | /* Leak hunting. Use hush_leaktool.sh for post-processing. |
| 1415 | */ |
| 1416 | #if LEAK_HUNTING |
| 1417 | static void *xxmalloc(int lineno, size_t size) |
| 1418 | { |
| 1419 | void *ptr = xmalloc((size + 0xff) & ~0xff); |
| 1420 | fdprintf(2, "line %d: malloc %p\n", lineno, ptr); |
| 1421 | return ptr; |
| 1422 | } |
| 1423 | static void *xxrealloc(int lineno, void *ptr, size_t size) |
| 1424 | { |
| 1425 | ptr = xrealloc(ptr, (size + 0xff) & ~0xff); |
| 1426 | fdprintf(2, "line %d: realloc %p\n", lineno, ptr); |
| 1427 | return ptr; |
| 1428 | } |
| 1429 | static char *xxstrdup(int lineno, const char *str) |
| 1430 | { |
| 1431 | char *ptr = xstrdup(str); |
| 1432 | fdprintf(2, "line %d: strdup %p\n", lineno, ptr); |
| 1433 | return ptr; |
| 1434 | } |
| 1435 | static void xxfree(void *ptr) |
| 1436 | { |
| 1437 | fdprintf(2, "free %p\n", ptr); |
| 1438 | free(ptr); |
| 1439 | } |
| 1440 | # define xmalloc(s) xxmalloc(__LINE__, s) |
| 1441 | # define xrealloc(p, s) xxrealloc(__LINE__, p, s) |
| 1442 | # define xstrdup(s) xxstrdup(__LINE__, s) |
| 1443 | # define free(p) xxfree(p) |
| 1444 | #endif |
| 1445 | |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 1446 | /* Syntax and runtime errors. They always abort scripts. |
| 1447 | * In interactive use they usually discard unparsed and/or unexecuted commands |
| 1448 | * and return to the prompt. |
| 1449 | * HUSH_DEBUG >= 2 prints line number in this file where it was detected. |
| 1450 | */ |
| 1451 | #if HUSH_DEBUG < 2 |
| 1452 | # define msg_and_die_if_script(lineno, ...) msg_and_die_if_script(__VA_ARGS__) |
| 1453 | # define syntax_error(lineno, msg) syntax_error(msg) |
| 1454 | # define syntax_error_at(lineno, msg) syntax_error_at(msg) |
| 1455 | # define syntax_error_unterm_ch(lineno, ch) syntax_error_unterm_ch(ch) |
| 1456 | # define syntax_error_unterm_str(lineno, s) syntax_error_unterm_str(s) |
| 1457 | # define syntax_error_unexpected_ch(lineno, ch) syntax_error_unexpected_ch(ch) |
| 1458 | #endif |
| 1459 | |
| 1460 | static void die_if_script(void) |
| 1461 | { |
| 1462 | if (!G_interactive_fd) { |
| 1463 | if (G.last_exitcode) /* sometines it's 2, not 1 (bash compat) */ |
| 1464 | xfunc_error_retval = G.last_exitcode; |
| 1465 | xfunc_die(); |
| 1466 | } |
| 1467 | } |
| 1468 | |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 1469 | #ifdef __U_BOOT__ |
| 1470 | static void __maybe_unused msg_and_die_if_script(unsigned lineno, const char *fmt, ...) |
| 1471 | #else /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 1472 | static void msg_and_die_if_script(unsigned lineno, const char *fmt, ...) |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 1473 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 1474 | { |
| 1475 | va_list p; |
| 1476 | |
| 1477 | #if HUSH_DEBUG >= 2 |
| 1478 | bb_error_msg("hush.c:%u", lineno); |
| 1479 | #endif |
| 1480 | va_start(p, fmt); |
| 1481 | bb_verror_msg(fmt, p, NULL); |
| 1482 | va_end(p); |
| 1483 | die_if_script(); |
| 1484 | } |
| 1485 | |
| 1486 | static void syntax_error(unsigned lineno UNUSED_PARAM, const char *msg) |
| 1487 | { |
| 1488 | if (msg) |
| 1489 | bb_error_msg("syntax error: %s", msg); |
| 1490 | else |
| 1491 | bb_simple_error_msg("syntax error"); |
| 1492 | die_if_script(); |
| 1493 | } |
| 1494 | |
| 1495 | static void syntax_error_at(unsigned lineno UNUSED_PARAM, const char *msg) |
| 1496 | { |
| 1497 | bb_error_msg("syntax error at '%s'", msg); |
| 1498 | die_if_script(); |
| 1499 | } |
| 1500 | |
| 1501 | static void syntax_error_unterm_str(unsigned lineno UNUSED_PARAM, const char *s) |
| 1502 | { |
| 1503 | bb_error_msg("syntax error: unterminated %s", s); |
| 1504 | //? source4.tests fails: in bash, echo ${^} in script does not terminate the script |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 1505 | // (but bash --posix, or if bash is run as "sh", does terminate in script, so maybe uncomment this?) |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 1506 | // die_if_script(); |
| 1507 | } |
| 1508 | |
| 1509 | static void syntax_error_unterm_ch(unsigned lineno, char ch) |
| 1510 | { |
| 1511 | char msg[2] = { ch, '\0' }; |
| 1512 | syntax_error_unterm_str(lineno, msg); |
| 1513 | } |
| 1514 | |
| 1515 | static void syntax_error_unexpected_ch(unsigned lineno UNUSED_PARAM, int ch) |
| 1516 | { |
| 1517 | char msg[2]; |
| 1518 | msg[0] = ch; |
| 1519 | msg[1] = '\0'; |
| 1520 | #if HUSH_DEBUG >= 2 |
| 1521 | bb_error_msg("hush.c:%u", lineno); |
| 1522 | #endif |
| 1523 | bb_error_msg("syntax error: unexpected %s", ch == EOF ? "EOF" : msg); |
| 1524 | die_if_script(); |
| 1525 | } |
| 1526 | |
| 1527 | #if HUSH_DEBUG < 2 |
| 1528 | # undef msg_and_die_if_script |
| 1529 | # undef syntax_error |
| 1530 | # undef syntax_error_at |
| 1531 | # undef syntax_error_unterm_ch |
| 1532 | # undef syntax_error_unterm_str |
| 1533 | # undef syntax_error_unexpected_ch |
| 1534 | #else |
| 1535 | # define msg_and_die_if_script(...) msg_and_die_if_script(__LINE__, __VA_ARGS__) |
| 1536 | # define syntax_error(msg) syntax_error(__LINE__, msg) |
| 1537 | # define syntax_error_at(msg) syntax_error_at(__LINE__, msg) |
| 1538 | # define syntax_error_unterm_ch(ch) syntax_error_unterm_ch(__LINE__, ch) |
| 1539 | # define syntax_error_unterm_str(s) syntax_error_unterm_str(__LINE__, s) |
| 1540 | # define syntax_error_unexpected_ch(ch) syntax_error_unexpected_ch(__LINE__, ch) |
| 1541 | #endif |
| 1542 | |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 1543 | /* Utility functions |
| 1544 | */ |
| 1545 | /* Replace each \x with x in place, return ptr past NUL. */ |
| 1546 | static char *unbackslash(char *src) |
| 1547 | { |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 1548 | #ifdef __U_BOOT__ |
| 1549 | char *dst = src = (char *)strchrnul(src, '\\'); |
| 1550 | #else /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 1551 | char *dst = src = strchrnul(src, '\\'); |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 1552 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 1553 | while (1) { |
| 1554 | if (*src == '\\') { |
| 1555 | src++; |
| 1556 | if (*src != '\0') { |
| 1557 | /* \x -> x */ |
| 1558 | *dst++ = *src++; |
| 1559 | continue; |
| 1560 | } |
| 1561 | /* else: "\<nul>". Do not delete this backslash. |
| 1562 | * Testcase: eval 'echo ok\' |
| 1563 | */ |
| 1564 | *dst++ = '\\'; |
| 1565 | /* fallthrough */ |
| 1566 | } |
| 1567 | if ((*dst++ = *src++) == '\0') |
| 1568 | break; |
| 1569 | } |
| 1570 | return dst; |
| 1571 | } |
| 1572 | |
| 1573 | static char **add_strings_to_strings(char **strings, char **add, int need_to_dup) |
| 1574 | { |
| 1575 | int i; |
| 1576 | unsigned count1; |
| 1577 | unsigned count2; |
| 1578 | char **v; |
| 1579 | |
| 1580 | v = strings; |
| 1581 | count1 = 0; |
| 1582 | if (v) { |
| 1583 | while (*v) { |
| 1584 | count1++; |
| 1585 | v++; |
| 1586 | } |
| 1587 | } |
| 1588 | count2 = 0; |
| 1589 | v = add; |
| 1590 | while (*v) { |
| 1591 | count2++; |
| 1592 | v++; |
| 1593 | } |
| 1594 | v = xrealloc(strings, (count1 + count2 + 1) * sizeof(char*)); |
| 1595 | v[count1 + count2] = NULL; |
| 1596 | i = count2; |
| 1597 | while (--i >= 0) |
| 1598 | v[count1 + i] = (need_to_dup ? xstrdup(add[i]) : add[i]); |
| 1599 | return v; |
| 1600 | } |
| 1601 | #if LEAK_HUNTING |
| 1602 | static char **xx_add_strings_to_strings(int lineno, char **strings, char **add, int need_to_dup) |
| 1603 | { |
| 1604 | char **ptr = add_strings_to_strings(strings, add, need_to_dup); |
| 1605 | fdprintf(2, "line %d: add_strings_to_strings %p\n", lineno, ptr); |
| 1606 | return ptr; |
| 1607 | } |
| 1608 | #define add_strings_to_strings(strings, add, need_to_dup) \ |
| 1609 | xx_add_strings_to_strings(__LINE__, strings, add, need_to_dup) |
| 1610 | #endif |
| 1611 | |
| 1612 | /* Note: takes ownership of "add" ptr (it is not strdup'ed) */ |
| 1613 | static char **add_string_to_strings(char **strings, char *add) |
| 1614 | { |
| 1615 | char *v[2]; |
| 1616 | v[0] = add; |
| 1617 | v[1] = NULL; |
| 1618 | return add_strings_to_strings(strings, v, /*dup:*/ 0); |
| 1619 | } |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 1620 | |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 1621 | #if LEAK_HUNTING |
| 1622 | static char **xx_add_string_to_strings(int lineno, char **strings, char *add) |
| 1623 | { |
| 1624 | char **ptr = add_string_to_strings(strings, add); |
| 1625 | fdprintf(2, "line %d: add_string_to_strings %p\n", lineno, ptr); |
| 1626 | return ptr; |
| 1627 | } |
| 1628 | #define add_string_to_strings(strings, add) \ |
| 1629 | xx_add_string_to_strings(__LINE__, strings, add) |
| 1630 | #endif |
| 1631 | |
| 1632 | static void free_strings(char **strings) |
| 1633 | { |
| 1634 | char **v; |
| 1635 | |
| 1636 | if (!strings) |
| 1637 | return; |
| 1638 | v = strings; |
| 1639 | while (*v) { |
| 1640 | free(*v); |
| 1641 | v++; |
| 1642 | } |
| 1643 | free(strings); |
| 1644 | } |
| 1645 | |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 1646 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 1647 | static int dup_CLOEXEC(int fd, int avoid_fd) |
| 1648 | { |
| 1649 | int newfd; |
| 1650 | repeat: |
| 1651 | newfd = fcntl(fd, F_DUPFD_CLOEXEC, avoid_fd + 1); |
| 1652 | if (newfd >= 0) { |
| 1653 | if (F_DUPFD_CLOEXEC == F_DUPFD) /* if old libc (w/o F_DUPFD_CLOEXEC) */ |
| 1654 | fcntl(newfd, F_SETFD, FD_CLOEXEC); |
| 1655 | } else { /* newfd < 0 */ |
| 1656 | if (errno == EBUSY) |
| 1657 | goto repeat; |
| 1658 | if (errno == EINTR) |
| 1659 | goto repeat; |
| 1660 | } |
| 1661 | return newfd; |
| 1662 | } |
| 1663 | |
| 1664 | static int xdup_CLOEXEC_and_close(int fd, int avoid_fd) |
| 1665 | { |
| 1666 | int newfd; |
| 1667 | repeat: |
| 1668 | newfd = fcntl(fd, F_DUPFD_CLOEXEC, avoid_fd + 1); |
| 1669 | if (newfd < 0) { |
| 1670 | if (errno == EBUSY) |
| 1671 | goto repeat; |
| 1672 | if (errno == EINTR) |
| 1673 | goto repeat; |
| 1674 | /* fd was not open? */ |
| 1675 | if (errno == EBADF) |
| 1676 | return fd; |
| 1677 | xfunc_die(); |
| 1678 | } |
| 1679 | if (F_DUPFD_CLOEXEC == F_DUPFD) /* if old libc (w/o F_DUPFD_CLOEXEC) */ |
| 1680 | fcntl(newfd, F_SETFD, FD_CLOEXEC); |
| 1681 | close(fd); |
| 1682 | return newfd; |
| 1683 | } |
| 1684 | |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 1685 | /* Manipulating HFILEs */ |
| 1686 | static HFILE *hfopen(const char *name) |
| 1687 | { |
| 1688 | HFILE *fp; |
| 1689 | int fd; |
| 1690 | |
| 1691 | fd = STDIN_FILENO; |
| 1692 | if (name) { |
| 1693 | fd = open(name, O_RDONLY | O_CLOEXEC); |
| 1694 | if (fd < 0) |
| 1695 | return NULL; |
| 1696 | if (O_CLOEXEC == 0) /* ancient libc */ |
| 1697 | close_on_exec_on(fd); |
| 1698 | } |
| 1699 | |
| 1700 | fp = xmalloc(sizeof(*fp)); |
| 1701 | if (name == NULL) |
| 1702 | G.HFILE_stdin = fp; |
| 1703 | fp->fd = fd; |
| 1704 | fp->cur = fp->end = fp->buf; |
| 1705 | fp->next_hfile = G.HFILE_list; |
| 1706 | G.HFILE_list = fp; |
| 1707 | return fp; |
| 1708 | } |
| 1709 | static void hfclose(HFILE *fp) |
| 1710 | { |
| 1711 | HFILE **pp = &G.HFILE_list; |
| 1712 | while (*pp) { |
| 1713 | HFILE *cur = *pp; |
| 1714 | if (cur == fp) { |
| 1715 | *pp = cur->next_hfile; |
| 1716 | break; |
| 1717 | } |
| 1718 | pp = &cur->next_hfile; |
| 1719 | } |
| 1720 | if (fp->fd >= 0) |
| 1721 | close(fp->fd); |
| 1722 | free(fp); |
| 1723 | } |
| 1724 | static int refill_HFILE_and_getc(HFILE *fp) |
| 1725 | { |
| 1726 | int n; |
| 1727 | |
| 1728 | if (fp->fd < 0) { |
| 1729 | /* Already saw EOF */ |
| 1730 | return EOF; |
| 1731 | } |
| 1732 | #if ENABLE_HUSH_INTERACTIVE && !ENABLE_FEATURE_EDITING |
| 1733 | /* If user presses ^C, read() restarts after SIGINT (we use SA_RESTART). |
| 1734 | * IOW: ^C will not immediately stop line input. |
| 1735 | * But poll() is different: it does NOT restart after signals. |
| 1736 | */ |
| 1737 | if (fp == G.HFILE_stdin) { |
| 1738 | struct pollfd pfd[1]; |
| 1739 | pfd[0].fd = fp->fd; |
| 1740 | pfd[0].events = POLLIN; |
| 1741 | n = poll(pfd, 1, -1); |
| 1742 | if (n < 0 |
| 1743 | /*&& errno == EINTR - assumed true */ |
| 1744 | && sigismember(&G.pending_set, SIGINT) |
| 1745 | ) { |
| 1746 | return '\0'; |
| 1747 | } |
| 1748 | } |
| 1749 | #else |
| 1750 | /* if FEATURE_EDITING=y, we do not use this routine for interactive input */ |
| 1751 | #endif |
| 1752 | /* Try to buffer more input */ |
| 1753 | n = safe_read(fp->fd, fp->buf, sizeof(fp->buf)); |
| 1754 | if (n < 0) { |
| 1755 | bb_simple_perror_msg("read error"); |
| 1756 | n = 0; |
| 1757 | } |
| 1758 | fp->cur = fp->buf; |
| 1759 | fp->end = fp->buf + n; |
| 1760 | if (n == 0) { |
| 1761 | /* EOF/error */ |
| 1762 | close(fp->fd); |
| 1763 | fp->fd = -1; |
| 1764 | return EOF; |
| 1765 | } |
| 1766 | return (unsigned char)(*fp->cur++); |
| 1767 | } |
| 1768 | /* Inlined for common case of non-empty buffer. |
| 1769 | */ |
| 1770 | static ALWAYS_INLINE int hfgetc(HFILE *fp) |
| 1771 | { |
| 1772 | if (fp->cur < fp->end) |
| 1773 | return (unsigned char)(*fp->cur++); |
| 1774 | /* Buffer empty */ |
| 1775 | return refill_HFILE_and_getc(fp); |
| 1776 | } |
| 1777 | static int move_HFILEs_on_redirect(int fd, int avoid_fd) |
| 1778 | { |
| 1779 | HFILE *fl = G.HFILE_list; |
| 1780 | while (fl) { |
| 1781 | if (fd == fl->fd) { |
| 1782 | /* We use it only on script files, they are all CLOEXEC */ |
| 1783 | fl->fd = xdup_CLOEXEC_and_close(fd, avoid_fd); |
| 1784 | debug_printf_redir("redirect_fd %d: matches a script fd, moving it to %d\n", fd, fl->fd); |
| 1785 | return 1; /* "found and moved" */ |
| 1786 | } |
| 1787 | fl = fl->next_hfile; |
| 1788 | } |
| 1789 | #if ENABLE_HUSH_MODE_X |
| 1790 | if (G.x_mode_fd > 0 && fd == G.x_mode_fd) { |
| 1791 | G.x_mode_fd = xdup_CLOEXEC_and_close(fd, avoid_fd); |
| 1792 | return 1; /* "found and moved" */ |
| 1793 | } |
| 1794 | #endif |
| 1795 | return 0; /* "not in the list" */ |
| 1796 | } |
| 1797 | #if ENABLE_FEATURE_SH_STANDALONE && BB_MMU |
| 1798 | static void close_all_HFILE_list(void) |
| 1799 | { |
| 1800 | HFILE *fl = G.HFILE_list; |
| 1801 | while (fl) { |
| 1802 | /* hfclose would also free HFILE object. |
| 1803 | * It is disastrous if we share memory with a vforked parent. |
| 1804 | * I'm not sure we never come here after vfork. |
| 1805 | * Therefore just close fd, nothing more. |
| 1806 | * |
| 1807 | * ">" instead of ">=": we don't close fd#0, |
| 1808 | * interactive shell uses hfopen(NULL) as stdin input |
| 1809 | * which has fl->fd == 0, but fd#0 gets redirected in pipes. |
| 1810 | * If we'd close it here, then e.g. interactive "set | sort" |
| 1811 | * with NOFORKed sort, would have sort's input fd closed. |
| 1812 | */ |
| 1813 | if (fl->fd > 0) |
| 1814 | /*hfclose(fl); - unsafe */ |
| 1815 | close(fl->fd); |
| 1816 | fl = fl->next_hfile; |
| 1817 | } |
| 1818 | } |
| 1819 | #endif |
| 1820 | static int fd_in_HFILEs(int fd) |
| 1821 | { |
| 1822 | HFILE *fl = G.HFILE_list; |
| 1823 | while (fl) { |
| 1824 | if (fl->fd == fd) |
| 1825 | return 1; |
| 1826 | fl = fl->next_hfile; |
| 1827 | } |
| 1828 | return 0; |
| 1829 | } |
| 1830 | |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 1831 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 1832 | |
| 1833 | /* Helpers for setting new $n and restoring them back |
| 1834 | */ |
| 1835 | typedef struct save_arg_t { |
| 1836 | char *sv_argv0; |
| 1837 | char **sv_g_argv; |
| 1838 | int sv_g_argc; |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 1839 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 1840 | IF_HUSH_SET(smallint sv_g_malloced;) |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 1841 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 1842 | } save_arg_t; |
| 1843 | |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 1844 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 1845 | static void save_and_replace_G_args(save_arg_t *sv, char **argv) |
| 1846 | { |
| 1847 | sv->sv_argv0 = argv[0]; |
| 1848 | sv->sv_g_argv = G.global_argv; |
| 1849 | sv->sv_g_argc = G.global_argc; |
| 1850 | IF_HUSH_SET(sv->sv_g_malloced = G.global_args_malloced;) |
| 1851 | |
| 1852 | argv[0] = G.global_argv[0]; /* retain $0 */ |
| 1853 | G.global_argv = argv; |
| 1854 | IF_HUSH_SET(G.global_args_malloced = 0;) |
| 1855 | |
| 1856 | G.global_argc = 1 + string_array_len(argv + 1); |
| 1857 | } |
| 1858 | |
| 1859 | static void restore_G_args(save_arg_t *sv, char **argv) |
| 1860 | { |
| 1861 | #if ENABLE_HUSH_SET |
| 1862 | if (G.global_args_malloced) { |
| 1863 | /* someone ran "set -- arg1 arg2 ...", undo */ |
| 1864 | char **pp = G.global_argv; |
| 1865 | while (*++pp) /* note: does not free $0 */ |
| 1866 | free(*pp); |
| 1867 | free(G.global_argv); |
| 1868 | } |
| 1869 | #endif |
| 1870 | argv[0] = sv->sv_argv0; |
| 1871 | G.global_argv = sv->sv_g_argv; |
| 1872 | G.global_argc = sv->sv_g_argc; |
| 1873 | IF_HUSH_SET(G.global_args_malloced = sv->sv_g_malloced;) |
| 1874 | } |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 1875 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 1876 | |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 1877 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 1878 | /* Basic theory of signal handling in shell |
| 1879 | * ======================================== |
| 1880 | * This does not describe what hush does, rather, it is current understanding |
| 1881 | * what it _should_ do. If it doesn't, it's a bug. |
| 1882 | * http://www.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#trap |
| 1883 | * |
| 1884 | * Signals are handled only after each pipe ("cmd | cmd | cmd" thing) |
| 1885 | * is finished or backgrounded. It is the same in interactive and |
| 1886 | * non-interactive shells, and is the same regardless of whether |
| 1887 | * a user trap handler is installed or a shell special one is in effect. |
| 1888 | * ^C or ^Z from keyboard seems to execute "at once" because it usually |
| 1889 | * backgrounds (i.e. stops) or kills all members of currently running |
| 1890 | * pipe. |
| 1891 | * |
| 1892 | * Wait builtin is interruptible by signals for which user trap is set |
| 1893 | * or by SIGINT in interactive shell. |
| 1894 | * |
| 1895 | * Trap handlers will execute even within trap handlers. (right?) |
| 1896 | * |
| 1897 | * User trap handlers are forgotten when subshell ("(cmd)") is entered, |
| 1898 | * except for handlers set to '' (empty string). |
| 1899 | * |
| 1900 | * If job control is off, backgrounded commands ("cmd &") |
| 1901 | * have SIGINT, SIGQUIT set to SIG_IGN. |
| 1902 | * |
| 1903 | * Commands which are run in command substitution ("`cmd`") |
| 1904 | * have SIGTTIN, SIGTTOU, SIGTSTP set to SIG_IGN. |
| 1905 | * |
| 1906 | * Ordinary commands have signals set to SIG_IGN/DFL as inherited |
| 1907 | * by the shell from its parent. |
| 1908 | * |
| 1909 | * Signals which differ from SIG_DFL action |
| 1910 | * (note: child (i.e., [v]forked) shell is not an interactive shell): |
| 1911 | * |
| 1912 | * SIGQUIT: ignore |
| 1913 | * SIGTERM (interactive): ignore |
| 1914 | * SIGHUP (interactive): |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 1915 | * Send SIGCONT to stopped jobs, send SIGHUP to all jobs and exit. |
| 1916 | * Kernel would do this for us ("orphaned process group" handling |
| 1917 | * according to POSIX) if we are a session leader and thus our death |
| 1918 | * frees the controlling tty, but to be bash-compatible, we also do it |
| 1919 | * for every interactive shell's death by SIGHUP. |
| 1920 | * (Also, we need to restore tty pgrp, otherwise e.g. Midnight Commander |
| 1921 | * backgrounds when hush started from it gets killed by SIGHUP). |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 1922 | * SIGTTIN, SIGTTOU, SIGTSTP (if job control is on): ignore |
| 1923 | * Note that ^Z is handled not by trapping SIGTSTP, but by seeing |
| 1924 | * that all pipe members are stopped. Try this in bash: |
| 1925 | * while :; do :; done - ^Z does not background it |
| 1926 | * (while :; do :; done) - ^Z backgrounds it |
| 1927 | * SIGINT (interactive): wait for last pipe, ignore the rest |
| 1928 | * of the command line, show prompt. NB: ^C does not send SIGINT |
| 1929 | * to interactive shell while shell is waiting for a pipe, |
| 1930 | * since shell is bg'ed (is not in foreground process group). |
| 1931 | * Example 1: this waits 5 sec, but does not execute ls: |
| 1932 | * "echo $$; sleep 5; ls -l" + "kill -INT <pid>" |
| 1933 | * Example 2: this does not wait and does not execute ls: |
| 1934 | * "echo $$; sleep 5 & wait; ls -l" + "kill -INT <pid>" |
| 1935 | * Example 3: this does not wait 5 sec, but executes ls: |
| 1936 | * "sleep 5; ls -l" + press ^C |
| 1937 | * Example 4: this does not wait and does not execute ls: |
| 1938 | * "sleep 5 & wait; ls -l" + press ^C |
| 1939 | * |
| 1940 | * (What happens to signals which are IGN on shell start?) |
| 1941 | * (What happens with signal mask on shell start?) |
| 1942 | * |
| 1943 | * Old implementation |
| 1944 | * ================== |
| 1945 | * We use in-kernel pending signal mask to determine which signals were sent. |
| 1946 | * We block all signals which we don't want to take action immediately, |
| 1947 | * i.e. we block all signals which need to have special handling as described |
| 1948 | * above, and all signals which have traps set. |
| 1949 | * After each pipe execution, we extract any pending signals via sigtimedwait() |
| 1950 | * and act on them. |
| 1951 | * |
| 1952 | * unsigned special_sig_mask: a mask of such "special" signals |
| 1953 | * sigset_t blocked_set: current blocked signal set |
| 1954 | * |
| 1955 | * "trap - SIGxxx": |
| 1956 | * clear bit in blocked_set unless it is also in special_sig_mask |
| 1957 | * "trap 'cmd' SIGxxx": |
| 1958 | * set bit in blocked_set (even if 'cmd' is '') |
| 1959 | * after [v]fork, if we plan to be a shell: |
| 1960 | * unblock signals with special interactive handling |
| 1961 | * (child shell is not interactive), |
| 1962 | * unset all traps except '' (note: regardless of child shell's type - {}, (), etc) |
| 1963 | * after [v]fork, if we plan to exec: |
| 1964 | * POSIX says fork clears pending signal mask in child - no need to clear it. |
| 1965 | * Restore blocked signal set to one inherited by shell just prior to exec. |
| 1966 | * |
| 1967 | * Note: as a result, we do not use signal handlers much. The only uses |
| 1968 | * are to count SIGCHLDs |
| 1969 | * and to restore tty pgrp on signal-induced exit. |
| 1970 | * |
| 1971 | * Note 2 (compat): |
| 1972 | * Standard says "When a subshell is entered, traps that are not being ignored |
| 1973 | * are set to the default actions". bash interprets it so that traps which |
| 1974 | * are set to '' (ignore) are NOT reset to defaults. We do the same. |
| 1975 | * |
| 1976 | * Problem: the above approach makes it unwieldy to catch signals while |
| 1977 | * we are in read builtin, or while we read commands from stdin: |
| 1978 | * masked signals are not visible! |
| 1979 | * |
| 1980 | * New implementation |
| 1981 | * ================== |
| 1982 | * We record each signal we are interested in by installing signal handler |
| 1983 | * for them - a bit like emulating kernel pending signal mask in userspace. |
| 1984 | * We are interested in: signals which need to have special handling |
| 1985 | * as described above, and all signals which have traps set. |
| 1986 | * Signals are recorded in pending_set. |
| 1987 | * After each pipe execution, we extract any pending signals |
| 1988 | * and act on them. |
| 1989 | * |
| 1990 | * unsigned special_sig_mask: a mask of shell-special signals. |
| 1991 | * unsigned fatal_sig_mask: a mask of signals on which we restore tty pgrp. |
| 1992 | * char *traps[sig] if trap for sig is set (even if it's ''). |
| 1993 | * sigset_t pending_set: set of sigs we received. |
| 1994 | * |
| 1995 | * "trap - SIGxxx": |
| 1996 | * if sig is in special_sig_mask, set handler back to: |
| 1997 | * record_pending_signo, or to IGN if it's a tty stop signal |
| 1998 | * if sig is in fatal_sig_mask, set handler back to sigexit. |
| 1999 | * else: set handler back to SIG_DFL |
| 2000 | * "trap 'cmd' SIGxxx": |
| 2001 | * set handler to record_pending_signo. |
| 2002 | * "trap '' SIGxxx": |
| 2003 | * set handler to SIG_IGN. |
| 2004 | * after [v]fork, if we plan to be a shell: |
| 2005 | * set signals with special interactive handling to SIG_DFL |
| 2006 | * (because child shell is not interactive), |
| 2007 | * unset all traps except '' (note: regardless of child shell's type - {}, (), etc) |
| 2008 | * after [v]fork, if we plan to exec: |
| 2009 | * POSIX says fork clears pending signal mask in child - no need to clear it. |
| 2010 | * |
| 2011 | * To make wait builtin interruptible, we handle SIGCHLD as special signal, |
| 2012 | * otherwise (if we leave it SIG_DFL) sigsuspend in wait builtin will not wake up on it. |
| 2013 | * |
| 2014 | * Note (compat): |
| 2015 | * Standard says "When a subshell is entered, traps that are not being ignored |
| 2016 | * are set to the default actions". bash interprets it so that traps which |
| 2017 | * are set to '' (ignore) are NOT reset to defaults. We do the same. |
| 2018 | */ |
| 2019 | enum { |
| 2020 | SPECIAL_INTERACTIVE_SIGS = 0 |
| 2021 | | (1 << SIGTERM) |
| 2022 | | (1 << SIGINT) |
| 2023 | | (1 << SIGHUP) |
| 2024 | , |
| 2025 | SPECIAL_JOBSTOP_SIGS = 0 |
| 2026 | #if ENABLE_HUSH_JOB |
| 2027 | | (1 << SIGTTIN) |
| 2028 | | (1 << SIGTTOU) |
| 2029 | | (1 << SIGTSTP) |
| 2030 | #endif |
| 2031 | , |
| 2032 | }; |
| 2033 | |
| 2034 | static void record_pending_signo(int sig) |
| 2035 | { |
| 2036 | sigaddset(&G.pending_set, sig); |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 2037 | #if ENABLE_FEATURE_EDITING |
| 2038 | if (sig != SIGCHLD |
| 2039 | || (G_traps && G_traps[SIGCHLD] && G_traps[SIGCHLD][0]) |
| 2040 | /* ^^^ if SIGCHLD, interrupt line reading only if it has a trap */ |
| 2041 | ) { |
| 2042 | bb_got_signal = sig; /* for read_line_input: "we got a signal" */ |
| 2043 | } |
| 2044 | #endif |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 2045 | #if ENABLE_HUSH_FAST |
| 2046 | if (sig == SIGCHLD) { |
| 2047 | G.count_SIGCHLD++; |
| 2048 | //bb_error_msg("[%d] SIGCHLD_handler: G.count_SIGCHLD:%d G.handled_SIGCHLD:%d", getpid(), G.count_SIGCHLD, G.handled_SIGCHLD); |
| 2049 | } |
| 2050 | #endif |
| 2051 | } |
| 2052 | |
| 2053 | static sighandler_t install_sighandler(int sig, sighandler_t handler) |
| 2054 | { |
| 2055 | struct sigaction old_sa; |
| 2056 | |
| 2057 | /* We could use signal() to install handlers... almost: |
| 2058 | * except that we need to mask ALL signals while handlers run. |
| 2059 | * I saw signal nesting in strace, race window isn't small. |
| 2060 | * SA_RESTART is also needed, but in Linux, signal() |
| 2061 | * sets SA_RESTART too. |
| 2062 | */ |
| 2063 | /* memset(&G.sa, 0, sizeof(G.sa)); - already done */ |
| 2064 | /* sigfillset(&G.sa.sa_mask); - already done */ |
| 2065 | /* G.sa.sa_flags = SA_RESTART; - already done */ |
| 2066 | G.sa.sa_handler = handler; |
| 2067 | sigaction(sig, &G.sa, &old_sa); |
| 2068 | return old_sa.sa_handler; |
| 2069 | } |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 2070 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 2071 | |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 2072 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 2073 | static void hush_exit(int exitcode) NORETURN; |
| 2074 | |
| 2075 | static void restore_ttypgrp_and__exit(void) NORETURN; |
| 2076 | static void restore_ttypgrp_and__exit(void) |
| 2077 | { |
| 2078 | /* xfunc has failed! die die die */ |
| 2079 | /* no EXIT traps, this is an escape hatch! */ |
| 2080 | G.exiting = 1; |
| 2081 | hush_exit(xfunc_error_retval); |
| 2082 | } |
| 2083 | |
| 2084 | #if ENABLE_HUSH_JOB |
| 2085 | |
| 2086 | /* Needed only on some libc: |
| 2087 | * It was observed that on exit(), fgetc'ed buffered data |
| 2088 | * gets "unwound" via lseek(fd, -NUM, SEEK_CUR). |
| 2089 | * With the net effect that even after fork(), not vfork(), |
| 2090 | * exit() in NOEXECed applet in "sh SCRIPT": |
| 2091 | * noexec_applet_here |
| 2092 | * echo END_OF_SCRIPT |
| 2093 | * lseeks fd in input FILE object from EOF to "e" in "echo END_OF_SCRIPT". |
| 2094 | * This makes "echo END_OF_SCRIPT" executed twice. |
| 2095 | * Similar problems can be seen with msg_and_die_if_script() -> xfunc_die() |
| 2096 | * and in `cmd` handling. |
| 2097 | * If set as die_func(), this makes xfunc_die() exit via _exit(), not exit(): |
| 2098 | */ |
| 2099 | static void fflush_and__exit(void) NORETURN; |
| 2100 | static void fflush_and__exit(void) |
| 2101 | { |
| 2102 | fflush_all(); |
| 2103 | _exit(xfunc_error_retval); |
| 2104 | } |
| 2105 | |
| 2106 | /* After [v]fork, in child: do not restore tty pgrp on xfunc death */ |
| 2107 | # define disable_restore_tty_pgrp_on_exit() (die_func = fflush_and__exit) |
| 2108 | /* After [v]fork, in parent: restore tty pgrp on xfunc death */ |
| 2109 | # define enable_restore_tty_pgrp_on_exit() (die_func = restore_ttypgrp_and__exit) |
| 2110 | |
| 2111 | /* Restores tty foreground process group, and exits. |
| 2112 | * May be called as signal handler for fatal signal |
| 2113 | * (will resend signal to itself, producing correct exit state) |
| 2114 | * or called directly with -EXITCODE. |
| 2115 | * We also call it if xfunc is exiting. |
| 2116 | */ |
| 2117 | static void sigexit(int sig) NORETURN; |
| 2118 | static void sigexit(int sig) |
| 2119 | { |
| 2120 | /* Careful: we can end up here after [v]fork. Do not restore |
| 2121 | * tty pgrp then, only top-level shell process does that */ |
| 2122 | if (G_saved_tty_pgrp && getpid() == G.root_pid) { |
| 2123 | /* Disable all signals: job control, SIGPIPE, etc. |
| 2124 | * Mostly paranoid measure, to prevent infinite SIGTTOU. |
| 2125 | */ |
| 2126 | sigprocmask_allsigs(SIG_BLOCK); |
| 2127 | tcsetpgrp(G_interactive_fd, G_saved_tty_pgrp); |
| 2128 | } |
| 2129 | |
| 2130 | /* Not a signal, just exit */ |
| 2131 | if (sig <= 0) |
| 2132 | _exit(- sig); |
| 2133 | |
| 2134 | kill_myself_with_sig(sig); /* does not return */ |
| 2135 | } |
| 2136 | #else |
| 2137 | |
| 2138 | # define disable_restore_tty_pgrp_on_exit() ((void)0) |
| 2139 | # define enable_restore_tty_pgrp_on_exit() ((void)0) |
| 2140 | |
| 2141 | #endif |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 2142 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 2143 | |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 2144 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 2145 | static sighandler_t pick_sighandler(unsigned sig) |
| 2146 | { |
| 2147 | sighandler_t handler = SIG_DFL; |
| 2148 | if (sig < sizeof(unsigned)*8) { |
| 2149 | unsigned sigmask = (1 << sig); |
| 2150 | |
| 2151 | #if ENABLE_HUSH_JOB |
| 2152 | /* is sig fatal? */ |
| 2153 | if (G_fatal_sig_mask & sigmask) |
| 2154 | handler = sigexit; |
| 2155 | else |
| 2156 | #endif |
| 2157 | /* sig has special handling? */ |
| 2158 | if (G.special_sig_mask & sigmask) { |
| 2159 | handler = record_pending_signo; |
| 2160 | /* TTIN/TTOU/TSTP can't be set to record_pending_signo |
| 2161 | * in order to ignore them: they will be raised |
| 2162 | * in an endless loop when we try to do some |
| 2163 | * terminal ioctls! We do have to _ignore_ these. |
| 2164 | */ |
| 2165 | if (SPECIAL_JOBSTOP_SIGS & sigmask) |
| 2166 | handler = SIG_IGN; |
| 2167 | } |
| 2168 | } |
| 2169 | return handler; |
| 2170 | } |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 2171 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 2172 | |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 2173 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 2174 | /* Restores tty foreground process group, and exits. */ |
| 2175 | static void hush_exit(int exitcode) |
| 2176 | { |
| 2177 | #if ENABLE_FEATURE_EDITING_SAVE_ON_EXIT |
| 2178 | save_history(G.line_input_state); /* may be NULL */ |
| 2179 | #endif |
| 2180 | |
| 2181 | fflush_all(); |
| 2182 | if (G.exiting <= 0 && G_traps && G_traps[0] && G_traps[0][0]) { |
| 2183 | char *argv[3]; |
| 2184 | /* argv[0] is unused */ |
| 2185 | argv[1] = xstrdup(G_traps[0]); /* copy, since EXIT trap handler may modify G_traps[0] */ |
| 2186 | argv[2] = NULL; |
| 2187 | G.exiting = 1; /* prevent EXIT trap recursion */ |
| 2188 | /* Note: G_traps[0] is not cleared! |
| 2189 | * "trap" will still show it, if executed |
| 2190 | * in the handler */ |
| 2191 | builtin_eval(argv); |
| 2192 | } |
| 2193 | |
| 2194 | #if ENABLE_FEATURE_CLEAN_UP |
| 2195 | { |
| 2196 | struct variable *cur_var; |
| 2197 | if (G.cwd != bb_msg_unknown) |
| 2198 | free((char*)G.cwd); |
| 2199 | cur_var = G.top_var; |
| 2200 | while (cur_var) { |
| 2201 | struct variable *tmp = cur_var; |
| 2202 | if (!cur_var->max_len) |
| 2203 | free(cur_var->varstr); |
| 2204 | cur_var = cur_var->next; |
| 2205 | free(tmp); |
| 2206 | } |
| 2207 | } |
| 2208 | #endif |
| 2209 | |
| 2210 | fflush_all(); |
| 2211 | #if ENABLE_HUSH_JOB |
| 2212 | sigexit(- (exitcode & 0xff)); |
| 2213 | #else |
| 2214 | _exit(exitcode); |
| 2215 | #endif |
| 2216 | } |
| 2217 | |
| 2218 | //TODO: return a mask of ALL handled sigs? |
| 2219 | static int check_and_run_traps(void) |
| 2220 | { |
| 2221 | int last_sig = 0; |
| 2222 | |
| 2223 | while (1) { |
| 2224 | int sig; |
| 2225 | |
| 2226 | if (sigisemptyset(&G.pending_set)) |
| 2227 | break; |
| 2228 | sig = 0; |
| 2229 | do { |
| 2230 | sig++; |
| 2231 | if (sigismember(&G.pending_set, sig)) { |
| 2232 | sigdelset(&G.pending_set, sig); |
| 2233 | goto got_sig; |
| 2234 | } |
| 2235 | } while (sig < NSIG); |
| 2236 | break; |
| 2237 | got_sig: |
| 2238 | #if ENABLE_HUSH_TRAP |
| 2239 | if (G_traps && G_traps[sig]) { |
| 2240 | debug_printf_exec("%s: sig:%d handler:'%s'\n", __func__, sig, G.traps[sig]); |
| 2241 | if (G_traps[sig][0]) { |
| 2242 | /* We have user-defined handler */ |
| 2243 | smalluint save_rcode; |
| 2244 | int save_pre; |
| 2245 | char *argv[3]; |
| 2246 | /* argv[0] is unused */ |
| 2247 | argv[1] = xstrdup(G_traps[sig]); |
| 2248 | /* why strdup? trap can modify itself: trap 'trap "echo oops" INT' INT */ |
| 2249 | argv[2] = NULL; |
| 2250 | save_pre = G.pre_trap_exitcode; |
| 2251 | G.pre_trap_exitcode = save_rcode = G.last_exitcode; |
| 2252 | builtin_eval(argv); |
| 2253 | free(argv[1]); |
| 2254 | G.pre_trap_exitcode = save_pre; |
| 2255 | G.last_exitcode = save_rcode; |
| 2256 | # if ENABLE_HUSH_FUNCTIONS |
| 2257 | if (G.return_exitcode >= 0) { |
| 2258 | debug_printf_exec("trap exitcode:%d\n", G.return_exitcode); |
| 2259 | G.last_exitcode = G.return_exitcode; |
| 2260 | } |
| 2261 | # endif |
| 2262 | last_sig = sig; |
| 2263 | } /* else: "" trap, ignoring signal */ |
| 2264 | continue; |
| 2265 | } |
| 2266 | #endif |
| 2267 | /* not a trap: special action */ |
| 2268 | switch (sig) { |
| 2269 | case SIGINT: |
| 2270 | debug_printf_exec("%s: sig:%d default SIGINT handler\n", __func__, sig); |
| 2271 | G.flag_SIGINT = 1; |
| 2272 | last_sig = sig; |
| 2273 | break; |
| 2274 | #if ENABLE_HUSH_JOB |
| 2275 | case SIGHUP: { |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 2276 | /* if (G_interactive_fd) - no need to check, the handler |
| 2277 | * is only installed if we *are* interactive */ |
| 2278 | { |
| 2279 | /* bash compat: "Before exiting, an interactive |
| 2280 | * shell resends the SIGHUP to all jobs, running |
| 2281 | * or stopped. Stopped jobs are sent SIGCONT |
| 2282 | * to ensure that they receive the SIGHUP." |
| 2283 | */ |
| 2284 | struct pipe *job; |
| 2285 | debug_printf_exec("%s: sig:%d default SIGHUP handler\n", __func__, sig); |
| 2286 | /* bash is observed to signal whole process groups, |
| 2287 | * not individual processes */ |
| 2288 | for (job = G.job_list; job; job = job->next) { |
| 2289 | if (job->pgrp <= 0) |
| 2290 | continue; |
| 2291 | debug_printf_exec("HUPing pgrp %d\n", job->pgrp); |
| 2292 | if (kill(- job->pgrp, SIGHUP) == 0) |
| 2293 | kill(- job->pgrp, SIGCONT); |
| 2294 | } |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 2295 | } |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 2296 | /* this restores tty pgrp, then kills us with SIGHUP */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 2297 | sigexit(SIGHUP); |
| 2298 | } |
| 2299 | #endif |
| 2300 | #if ENABLE_HUSH_FAST |
| 2301 | case SIGCHLD: |
| 2302 | debug_printf_exec("%s: sig:%d default SIGCHLD handler\n", __func__, sig); |
| 2303 | G.count_SIGCHLD++; |
| 2304 | //bb_error_msg("[%d] check_and_run_traps: G.count_SIGCHLD:%d G.handled_SIGCHLD:%d", getpid(), G.count_SIGCHLD, G.handled_SIGCHLD); |
| 2305 | /* Note: |
| 2306 | * We don't do 'last_sig = sig' here -> NOT returning this sig. |
| 2307 | * This simplifies wait builtin a bit. |
| 2308 | */ |
| 2309 | break; |
| 2310 | #endif |
| 2311 | default: /* ignored: */ |
| 2312 | debug_printf_exec("%s: sig:%d default handling is to ignore\n", __func__, sig); |
| 2313 | /* SIGTERM, SIGQUIT, SIGTTIN, SIGTTOU, SIGTSTP */ |
| 2314 | /* Note: |
| 2315 | * We don't do 'last_sig = sig' here -> NOT returning this sig. |
| 2316 | * Example: wait is not interrupted by TERM |
| 2317 | * in interactive shell, because TERM is ignored. |
| 2318 | */ |
| 2319 | break; |
| 2320 | } |
| 2321 | } |
| 2322 | return last_sig; |
| 2323 | } |
| 2324 | |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 2325 | static const char *get_cwd(int force) |
| 2326 | { |
| 2327 | if (force || G.cwd == NULL) { |
| 2328 | /* xrealloc_getcwd_or_warn(arg) calls free(arg), |
| 2329 | * we must not try to free(bb_msg_unknown) */ |
| 2330 | if (G.cwd == bb_msg_unknown) |
| 2331 | G.cwd = NULL; |
| 2332 | G.cwd = xrealloc_getcwd_or_warn((char *)G.cwd); |
| 2333 | if (!G.cwd) |
| 2334 | G.cwd = bb_msg_unknown; |
| 2335 | } |
| 2336 | return G.cwd; |
| 2337 | } |
| 2338 | |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 2339 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 2340 | |
| 2341 | /* |
| 2342 | * Shell and environment variable support |
| 2343 | */ |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 2344 | static struct variable **get_ptr_to_local_var(const char *name) |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 2345 | { |
| 2346 | struct variable **pp; |
| 2347 | struct variable *cur; |
| 2348 | |
| 2349 | pp = &G.top_var; |
| 2350 | while ((cur = *pp) != NULL) { |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 2351 | if (varcmp(cur->varstr, name) == 0) |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 2352 | return pp; |
| 2353 | pp = &cur->next; |
| 2354 | } |
| 2355 | return NULL; |
| 2356 | } |
| 2357 | |
| 2358 | static const char* FAST_FUNC get_local_var_value(const char *name) |
| 2359 | { |
| 2360 | struct variable **vpp; |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 2361 | |
| 2362 | if (G.expanded_assignments) { |
| 2363 | char **cpp = G.expanded_assignments; |
| 2364 | while (*cpp) { |
| 2365 | char *cp = *cpp; |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 2366 | if (varcmp(cp, name) == 0) |
| 2367 | return strchr(cp, '=') + 1; |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 2368 | cpp++; |
| 2369 | } |
| 2370 | } |
| 2371 | |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 2372 | vpp = get_ptr_to_local_var(name); |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 2373 | if (vpp) |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 2374 | return strchr((*vpp)->varstr, '=') + 1; |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 2375 | |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 2376 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 2377 | if (strcmp(name, "PPID") == 0) |
| 2378 | return utoa(G.root_ppid); |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 2379 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 2380 | // bash compat: UID? EUID? |
| 2381 | #if ENABLE_HUSH_RANDOM_SUPPORT |
| 2382 | if (strcmp(name, "RANDOM") == 0) |
| 2383 | return utoa(next_random(&G.random_gen)); |
| 2384 | #endif |
| 2385 | #if ENABLE_HUSH_LINENO_VAR |
| 2386 | if (strcmp(name, "LINENO") == 0) |
| 2387 | return utoa(G.execute_lineno); |
| 2388 | #endif |
| 2389 | #if BASH_EPOCH_VARS |
| 2390 | { |
| 2391 | const char *fmt = NULL; |
| 2392 | if (strcmp(name, "EPOCHSECONDS") == 0) |
| 2393 | fmt = "%llu"; |
| 2394 | else if (strcmp(name, "EPOCHREALTIME") == 0) |
| 2395 | fmt = "%llu.%06u"; |
| 2396 | if (fmt) { |
| 2397 | struct timeval tv; |
| 2398 | xgettimeofday(&tv); |
| 2399 | sprintf(G.epoch_buf, fmt, (unsigned long long)tv.tv_sec, |
| 2400 | (unsigned)tv.tv_usec); |
| 2401 | return G.epoch_buf; |
| 2402 | } |
| 2403 | } |
| 2404 | #endif |
| 2405 | return NULL; |
| 2406 | } |
| 2407 | |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 2408 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 2409 | #if ENABLE_HUSH_GETOPTS |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 2410 | static void handle_changed_special_names(const char *name) |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 2411 | { |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 2412 | if (varcmp(name, "OPTIND") == 0) { |
| 2413 | G.getopt_count = 0; |
| 2414 | return; |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 2415 | } |
| 2416 | } |
| 2417 | #else |
| 2418 | /* Do not even bother evaluating arguments */ |
| 2419 | # define handle_changed_special_names(...) ((void)0) |
| 2420 | #endif |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 2421 | #else /* __U_BOOT__ */ |
| 2422 | /* Do not even bother evaluating arguments */ |
| 2423 | # define handle_changed_special_names(...) ((void)0) |
| 2424 | #endif /* __U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 2425 | |
| 2426 | /* str holds "NAME=VAL" and is expected to be malloced. |
| 2427 | * We take ownership of it. |
| 2428 | */ |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 2429 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 2430 | #define SETFLAG_EXPORT (1 << 0) |
| 2431 | #define SETFLAG_UNEXPORT (1 << 1) |
| 2432 | #define SETFLAG_MAKE_RO (1 << 2) |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 2433 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 2434 | #define SETFLAG_VARLVL_SHIFT 3 |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 2435 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 2436 | static int set_local_var(char *str, unsigned flags) |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 2437 | #else /* __U_BOOT__ */ |
| 2438 | int set_local_var_modern(char *str, int flags) |
| 2439 | #endif /* __U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 2440 | { |
| 2441 | struct variable **cur_pp; |
| 2442 | struct variable *cur; |
| 2443 | char *free_me = NULL; |
| 2444 | char *eq_sign; |
| 2445 | int name_len; |
| 2446 | int retval; |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 2447 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 2448 | unsigned local_lvl = (flags >> SETFLAG_VARLVL_SHIFT); |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 2449 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 2450 | |
| 2451 | eq_sign = strchr(str, '='); |
| 2452 | if (HUSH_DEBUG && !eq_sign) |
| 2453 | bb_simple_error_msg_and_die("BUG in setvar"); |
| 2454 | |
| 2455 | name_len = eq_sign - str + 1; /* including '=' */ |
| 2456 | cur_pp = &G.top_var; |
| 2457 | while ((cur = *cur_pp) != NULL) { |
| 2458 | if (strncmp(cur->varstr, str, name_len) != 0) { |
| 2459 | cur_pp = &cur->next; |
| 2460 | continue; |
| 2461 | } |
| 2462 | |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 2463 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 2464 | /* We found an existing var with this name */ |
| 2465 | if (cur->flg_read_only) { |
| 2466 | bb_error_msg("%s: readonly variable", str); |
| 2467 | free(str); |
| 2468 | //NOTE: in bash, assignment in "export READONLY_VAR=Z" fails, and sets $?=1, |
| 2469 | //but export per se succeeds (does put the var in env). We don't mimic that. |
| 2470 | return -1; |
| 2471 | } |
| 2472 | if (flags & SETFLAG_UNEXPORT) { // && cur->flg_export ? |
| 2473 | debug_printf_env("%s: unsetenv '%s'\n", __func__, str); |
| 2474 | *eq_sign = '\0'; |
| 2475 | unsetenv(str); |
| 2476 | *eq_sign = '='; |
| 2477 | } |
| 2478 | if (cur->var_nest_level < local_lvl) { |
| 2479 | /* bash 3.2.33(1) and exported vars: |
| 2480 | * # export z=z |
| 2481 | * # f() { local z=a; env | grep ^z; } |
| 2482 | * # f |
| 2483 | * z=a |
| 2484 | * # env | grep ^z |
| 2485 | * z=z |
| 2486 | */ |
| 2487 | if (cur->flg_export) |
| 2488 | flags |= SETFLAG_EXPORT; |
| 2489 | /* New variable is local ("local VAR=VAL" or |
| 2490 | * "VAR=VAL cmd") |
| 2491 | * and existing one is global, or local |
| 2492 | * on a lower level that new one. |
| 2493 | * Remove it from global variable list: |
| 2494 | */ |
| 2495 | *cur_pp = cur->next; |
| 2496 | if (G.shadowed_vars_pp) { |
| 2497 | /* Save in "shadowed" list */ |
| 2498 | debug_printf_env("shadowing %s'%s'/%u by '%s'/%u\n", |
| 2499 | cur->flg_export ? "exported " : "", |
| 2500 | cur->varstr, cur->var_nest_level, str, local_lvl |
| 2501 | ); |
| 2502 | cur->next = *G.shadowed_vars_pp; |
| 2503 | *G.shadowed_vars_pp = cur; |
| 2504 | } else { |
| 2505 | /* Came from pseudo_exec_argv(), no need to save: delete it */ |
| 2506 | debug_printf_env("shadow-deleting %s'%s'/%u by '%s'/%u\n", |
| 2507 | cur->flg_export ? "exported " : "", |
| 2508 | cur->varstr, cur->var_nest_level, str, local_lvl |
| 2509 | ); |
| 2510 | if (cur->max_len == 0) /* allocated "VAR=VAL"? */ |
| 2511 | free_me = cur->varstr; /* then free it later */ |
| 2512 | free(cur); |
| 2513 | } |
| 2514 | break; |
| 2515 | } |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 2516 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 2517 | |
| 2518 | if (strcmp(cur->varstr + name_len, eq_sign + 1) == 0) { |
| 2519 | debug_printf_env("assignement '%s' does not change anything\n", str); |
| 2520 | free_and_exp: |
| 2521 | free(str); |
| 2522 | goto exp; |
| 2523 | } |
| 2524 | |
| 2525 | /* Replace the value in the found "struct variable" */ |
| 2526 | if (cur->max_len != 0) { |
| 2527 | if (cur->max_len >= strnlen(str, cur->max_len + 1)) { |
| 2528 | /* This one is from startup env, reuse space */ |
| 2529 | debug_printf_env("reusing startup env for '%s'\n", str); |
| 2530 | strcpy(cur->varstr, str); |
| 2531 | goto free_and_exp; |
| 2532 | } |
| 2533 | /* Can't reuse */ |
| 2534 | cur->max_len = 0; |
| 2535 | goto set_str_and_exp; |
| 2536 | } |
| 2537 | /* max_len == 0 signifies "malloced" var, which we can |
| 2538 | * (and have to) free. But we can't free(cur->varstr) here: |
| 2539 | * if cur->flg_export is 1, it is in the environment. |
| 2540 | * We should either unsetenv+free, or wait until putenv, |
| 2541 | * then putenv(new)+free(old). |
| 2542 | */ |
| 2543 | free_me = cur->varstr; |
| 2544 | goto set_str_and_exp; |
| 2545 | } |
| 2546 | |
| 2547 | /* Not found or shadowed - create new variable struct */ |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 2548 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 2549 | debug_printf_env("%s: alloc new var '%s'/%u\n", __func__, str, local_lvl); |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 2550 | #else /* __U_BOOT__ */ |
| 2551 | debug_printf_env("%s: alloc new var '%s'\n", __func__, str); |
| 2552 | #endif /* __U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 2553 | cur = xzalloc(sizeof(*cur)); |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 2554 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 2555 | cur->var_nest_level = local_lvl; |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 2556 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 2557 | cur->next = *cur_pp; |
| 2558 | *cur_pp = cur; |
| 2559 | |
| 2560 | set_str_and_exp: |
| 2561 | cur->varstr = str; |
| 2562 | exp: |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 2563 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 2564 | #if !BB_MMU || ENABLE_HUSH_READONLY |
| 2565 | if (flags & SETFLAG_MAKE_RO) { |
| 2566 | cur->flg_read_only = 1; |
| 2567 | } |
| 2568 | #endif |
| 2569 | if (flags & SETFLAG_EXPORT) |
| 2570 | cur->flg_export = 1; |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 2571 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 2572 | retval = 0; |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 2573 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 2574 | if (cur->flg_export) { |
| 2575 | if (flags & SETFLAG_UNEXPORT) { |
| 2576 | cur->flg_export = 0; |
| 2577 | /* unsetenv was already done */ |
| 2578 | } else { |
| 2579 | debug_printf_env("%s: putenv '%s'/%u\n", __func__, cur->varstr, cur->var_nest_level); |
| 2580 | retval = putenv(cur->varstr); |
| 2581 | /* fall through to "free(free_me)" - |
| 2582 | * only now we can free old exported malloced string |
| 2583 | */ |
| 2584 | } |
| 2585 | } |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 2586 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 2587 | free(free_me); |
| 2588 | |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 2589 | handle_changed_special_names(cur->varstr); |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 2590 | |
| 2591 | return retval; |
| 2592 | } |
| 2593 | |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 2594 | #ifndef __U_BOOT__ |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 2595 | static int set_local_var0(char *str) |
| 2596 | { |
| 2597 | return set_local_var(str, 0); |
| 2598 | } |
| 2599 | |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 2600 | static void FAST_FUNC set_local_var_from_halves(const char *name, const char *val) |
| 2601 | { |
| 2602 | char *var = xasprintf("%s=%s", name, val); |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 2603 | set_local_var0(var); |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 2604 | } |
| 2605 | |
| 2606 | /* Used at startup and after each cd */ |
| 2607 | static void set_pwd_var(unsigned flag) |
| 2608 | { |
| 2609 | set_local_var(xasprintf("PWD=%s", get_cwd(/*force:*/ 1)), flag); |
| 2610 | } |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 2611 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 2612 | |
| 2613 | #if ENABLE_HUSH_UNSET || ENABLE_HUSH_GETOPTS |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 2614 | static int unset_local_var(const char *name) |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 2615 | { |
| 2616 | struct variable *cur; |
| 2617 | struct variable **cur_pp; |
| 2618 | |
| 2619 | cur_pp = &G.top_var; |
| 2620 | while ((cur = *cur_pp) != NULL) { |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 2621 | if (varcmp(cur->varstr, name) == 0) { |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 2622 | if (cur->flg_read_only) { |
| 2623 | bb_error_msg("%s: readonly variable", name); |
| 2624 | return EXIT_FAILURE; |
| 2625 | } |
| 2626 | |
| 2627 | *cur_pp = cur->next; |
| 2628 | debug_printf_env("%s: unsetenv '%s'\n", __func__, cur->varstr); |
| 2629 | bb_unsetenv(cur->varstr); |
| 2630 | if (!cur->max_len) |
| 2631 | free(cur->varstr); |
| 2632 | free(cur); |
| 2633 | |
| 2634 | break; |
| 2635 | } |
| 2636 | cur_pp = &cur->next; |
| 2637 | } |
| 2638 | |
| 2639 | /* Handle "unset LINENO" et al even if did not find the variable to unset */ |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 2640 | handle_changed_special_names(name); |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 2641 | |
| 2642 | return EXIT_SUCCESS; |
| 2643 | } |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 2644 | #endif |
| 2645 | |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 2646 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 2647 | /* |
| 2648 | * Helpers for "var1=val1 var2=val2 cmd" feature |
| 2649 | */ |
| 2650 | static void add_vars(struct variable *var) |
| 2651 | { |
| 2652 | struct variable *next; |
| 2653 | |
| 2654 | while (var) { |
| 2655 | next = var->next; |
| 2656 | var->next = G.top_var; |
| 2657 | G.top_var = var; |
| 2658 | if (var->flg_export) { |
| 2659 | debug_printf_env("%s: restoring exported '%s'/%u\n", __func__, var->varstr, var->var_nest_level); |
| 2660 | putenv(var->varstr); |
| 2661 | } else { |
| 2662 | debug_printf_env("%s: restoring variable '%s'/%u\n", __func__, var->varstr, var->var_nest_level); |
| 2663 | } |
| 2664 | var = next; |
| 2665 | } |
| 2666 | } |
| 2667 | |
| 2668 | /* We put strings[i] into variable table and possibly putenv them. |
| 2669 | * If variable is read only, we can free the strings[i] |
| 2670 | * which attempts to overwrite it. |
| 2671 | * The strings[] vector itself is freed. |
| 2672 | */ |
| 2673 | static void set_vars_and_save_old(char **strings) |
| 2674 | { |
| 2675 | char **s; |
| 2676 | |
| 2677 | if (!strings) |
| 2678 | return; |
| 2679 | |
| 2680 | s = strings; |
| 2681 | while (*s) { |
| 2682 | struct variable *var_p; |
| 2683 | struct variable **var_pp; |
| 2684 | char *eq; |
| 2685 | |
| 2686 | eq = strchr(*s, '='); |
| 2687 | if (HUSH_DEBUG && !eq) |
| 2688 | bb_simple_error_msg_and_die("BUG in varexp4"); |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 2689 | var_pp = get_ptr_to_local_var(*s); |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 2690 | if (var_pp) { |
| 2691 | var_p = *var_pp; |
| 2692 | if (var_p->flg_read_only) { |
| 2693 | char **p; |
| 2694 | bb_error_msg("%s: readonly variable", *s); |
| 2695 | /* |
| 2696 | * "VAR=V BLTIN" unsets VARs after BLTIN completes. |
| 2697 | * If VAR is readonly, leaving it in the list |
| 2698 | * after asssignment error (msg above) |
| 2699 | * causes doubled error message later, on unset. |
| 2700 | */ |
| 2701 | debug_printf_env("removing/freeing '%s' element\n", *s); |
| 2702 | free(*s); |
| 2703 | p = s; |
| 2704 | do { *p = p[1]; p++; } while (*p); |
| 2705 | goto next; |
| 2706 | } |
| 2707 | /* below, set_local_var() with nest level will |
| 2708 | * "shadow" (remove) this variable from |
| 2709 | * global linked list. |
| 2710 | */ |
| 2711 | } |
| 2712 | debug_printf_env("%s: env override '%s'/%u\n", __func__, *s, G.var_nest_level); |
| 2713 | set_local_var(*s, (G.var_nest_level << SETFLAG_VARLVL_SHIFT) | SETFLAG_EXPORT); |
| 2714 | s++; |
| 2715 | next: ; |
| 2716 | } |
| 2717 | free(strings); |
| 2718 | } |
| 2719 | |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 2720 | /* |
| 2721 | * Unicode helper |
| 2722 | */ |
| 2723 | static void reinit_unicode_for_hush(void) |
| 2724 | { |
| 2725 | /* Unicode support should be activated even if LANG is set |
| 2726 | * _during_ shell execution, not only if it was set when |
| 2727 | * shell was started. Therefore, re-check LANG every time: |
| 2728 | */ |
| 2729 | if (ENABLE_FEATURE_CHECK_UNICODE_IN_ENV |
| 2730 | || ENABLE_UNICODE_USING_LOCALE |
| 2731 | ) { |
| 2732 | const char *s = get_local_var_value("LC_ALL"); |
| 2733 | if (!s) s = get_local_var_value("LC_CTYPE"); |
| 2734 | if (!s) s = get_local_var_value("LANG"); |
| 2735 | reinit_unicode(s); |
| 2736 | } |
| 2737 | } |
| 2738 | |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 2739 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 2740 | /* |
| 2741 | * in_str support (strings, and "strings" read from files). |
| 2742 | */ |
| 2743 | |
| 2744 | #if ENABLE_HUSH_INTERACTIVE |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 2745 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 2746 | /* To test correct lineedit/interactive behavior, type from command line: |
| 2747 | * echo $P\ |
| 2748 | * \ |
| 2749 | * AT\ |
| 2750 | * H\ |
| 2751 | * \ |
| 2752 | * It exercises a lot of corner cases. |
| 2753 | */ |
| 2754 | static const char *setup_prompt_string(void) |
| 2755 | { |
| 2756 | const char *prompt_str; |
| 2757 | |
| 2758 | debug_printf_prompt("%s promptmode:%d\n", __func__, G.promptmode); |
| 2759 | |
| 2760 | # if ENABLE_FEATURE_EDITING_FANCY_PROMPT |
| 2761 | prompt_str = get_local_var_value(G.promptmode == 0 ? "PS1" : "PS2"); |
| 2762 | if (!prompt_str) |
| 2763 | prompt_str = ""; |
| 2764 | # else |
| 2765 | prompt_str = "> "; /* if PS2, else... */ |
| 2766 | if (G.promptmode == 0) { /* PS1 */ |
| 2767 | /* No fancy prompts supported, (re)generate "CURDIR $ " by hand */ |
| 2768 | free(G.PS1); |
| 2769 | /* bash uses $PWD value, even if it is set by user. |
| 2770 | * It uses current dir only if PWD is unset. |
| 2771 | * We always use current dir. */ |
| 2772 | prompt_str = G.PS1 = xasprintf("%s %c ", get_cwd(0), (geteuid() != 0) ? '$' : '#'); |
| 2773 | } |
| 2774 | # endif |
| 2775 | debug_printf("prompt_str '%s'\n", prompt_str); |
| 2776 | return prompt_str; |
| 2777 | } |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 2778 | #endif /* !__U_BOOT__ */ |
| 2779 | |
| 2780 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 2781 | static int get_user_input(struct in_str *i) |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 2782 | #else /* __U_BOOT__ */ |
| 2783 | static void get_user_input(struct in_str *i) |
| 2784 | #endif /* __U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 2785 | { |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 2786 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 2787 | # if ENABLE_FEATURE_EDITING |
| 2788 | /* In EDITING case, this function reads next input line, |
| 2789 | * saves it in i->p, then returns 1st char of it. |
| 2790 | */ |
| 2791 | int r; |
| 2792 | const char *prompt_str; |
| 2793 | |
| 2794 | prompt_str = setup_prompt_string(); |
| 2795 | for (;;) { |
| 2796 | reinit_unicode_for_hush(); |
| 2797 | G.flag_SIGINT = 0; |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 2798 | |
| 2799 | bb_got_signal = 0; |
| 2800 | if (!sigisemptyset(&G.pending_set)) { |
| 2801 | /* Whoops, already got a signal, do not call read_line_input */ |
| 2802 | bb_got_signal = r = -1; |
| 2803 | } else { |
| 2804 | /* For shell, LI_INTERRUPTIBLE is set: |
| 2805 | * read_line_input will abort on either |
| 2806 | * getting EINTR in poll() and bb_got_signal became != 0, |
| 2807 | * or if it sees bb_got_signal != 0 |
| 2808 | * (IOW: if signal arrives before poll() is reached). |
| 2809 | * Interactive testcases: |
| 2810 | * (while kill -INT $$; do sleep 1; done) & |
| 2811 | * #^^^ prints ^C, prints prompt, repeats |
| 2812 | * trap 'echo I' int; (while kill -INT $$; do sleep 1; done) & |
| 2813 | * #^^^ prints ^C, prints "I", prints prompt, repeats |
| 2814 | * trap 'echo T' term; (while kill $$; do sleep 1; done) & |
| 2815 | * #^^^ prints "T", prints prompt, repeats |
| 2816 | * #(bash 5.0.17 exits after first "T", looks like a bug) |
| 2817 | */ |
| 2818 | r = read_line_input(G.line_input_state, prompt_str, |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 2819 | G.user_input_buf, CONFIG_FEATURE_EDITING_MAX_LEN-1 |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 2820 | ); |
| 2821 | /* read_line_input intercepts ^C, "convert" it to SIGINT */ |
| 2822 | if (r == 0) |
| 2823 | raise(SIGINT); |
| 2824 | } |
| 2825 | /* bash prints ^C (before running a trap, if any) |
| 2826 | * both on keyboard ^C and on real SIGINT (non-kbd generated). |
| 2827 | */ |
| 2828 | if (sigismember(&G.pending_set, SIGINT)) { |
| 2829 | write(STDOUT_FILENO, "^C\n", 3); |
| 2830 | G.last_exitcode = 128 | SIGINT; |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 2831 | } |
| 2832 | check_and_run_traps(); |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 2833 | if (r == 0) /* keyboard ^C? */ |
| 2834 | continue; /* go back, read another input line */ |
| 2835 | if (r > 0) /* normal input? (no ^C, no ^D, no signals) */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 2836 | break; |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 2837 | if (!bb_got_signal) { |
| 2838 | /* r < 0: ^D/EOF/error detected (but not signal) */ |
| 2839 | /* ^D on interactive input goes to next line before exiting: */ |
| 2840 | write(STDOUT_FILENO, "\n", 1); |
| 2841 | i->p = NULL; |
| 2842 | i->peek_buf[0] = r = EOF; |
| 2843 | return r; |
| 2844 | } |
| 2845 | /* it was a signal: go back, read another input line */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 2846 | } |
| 2847 | i->p = G.user_input_buf; |
| 2848 | return (unsigned char)*i->p++; |
| 2849 | # else |
| 2850 | /* In !EDITING case, this function gets called for every char. |
| 2851 | * Buffering happens deeper in the call chain, in hfgetc(i->file). |
| 2852 | */ |
| 2853 | int r; |
| 2854 | |
| 2855 | for (;;) { |
| 2856 | G.flag_SIGINT = 0; |
| 2857 | if (i->last_char == '\0' || i->last_char == '\n') { |
| 2858 | const char *prompt_str = setup_prompt_string(); |
| 2859 | /* Why check_and_run_traps here? Try this interactively: |
| 2860 | * $ trap 'echo INT' INT; (sleep 2; kill -INT $$) & |
| 2861 | * $ <[enter], repeatedly...> |
| 2862 | * Without check_and_run_traps, handler never runs. |
| 2863 | */ |
| 2864 | check_and_run_traps(); |
| 2865 | fputs_stdout(prompt_str); |
| 2866 | fflush_all(); |
| 2867 | } |
| 2868 | r = hfgetc(i->file); |
| 2869 | /* In !ENABLE_FEATURE_EDITING we don't use read_line_input, |
| 2870 | * no ^C masking happens during fgetc, no special code for ^C: |
| 2871 | * it generates SIGINT as usual. |
| 2872 | */ |
| 2873 | check_and_run_traps(); |
| 2874 | if (r != '\0' && !G.flag_SIGINT) |
| 2875 | break; |
| 2876 | if (G.flag_SIGINT) { |
| 2877 | /* ^C or SIGINT: repeat */ |
| 2878 | /* bash prints ^C even on real SIGINT (non-kbd generated) */ |
| 2879 | /* kernel prints "^C" itself, just print newline: */ |
| 2880 | write(STDOUT_FILENO, "\n", 1); |
| 2881 | G.last_exitcode = 128 | SIGINT; |
| 2882 | } |
| 2883 | } |
| 2884 | return r; |
| 2885 | # endif |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 2886 | #else /* __U_BOOT__ */ |
| 2887 | int n; |
| 2888 | int promptme; |
| 2889 | static char the_command[CONFIG_SYS_CBSIZE + 1]; |
| 2890 | |
| 2891 | bootretry_reset_cmd_timeout(); |
| 2892 | promptme = 1; |
| 2893 | n = u_boot_cli_readline(i); |
| 2894 | |
| 2895 | # ifdef CONFIG_BOOT_RETRY_TIME |
| 2896 | if (n == -2) { |
| 2897 | puts("\nTimeout waiting for command\n"); |
| 2898 | # ifdef CONFIG_RESET_TO_RETRY |
| 2899 | do_reset(NULL, 0, 0, NULL); |
| 2900 | # else |
| 2901 | # error "This currently only works with CONFIG_RESET_TO_RETRY enabled" |
| 2902 | # endif |
| 2903 | } |
| 2904 | # endif |
| 2905 | if (n == -1 ) { |
| 2906 | G.flag_repeat = 0; |
| 2907 | promptme = 0; |
| 2908 | } |
| 2909 | n = strlen(console_buffer); |
| 2910 | console_buffer[n] = '\n'; |
| 2911 | console_buffer[n+1]= '\0'; |
| 2912 | if (had_ctrlc()) |
| 2913 | G.flag_repeat = 0; |
| 2914 | clear_ctrlc(); |
| 2915 | G.do_repeat = 0; |
| 2916 | #ifndef __U_BOOT__ |
| 2917 | if (G.promptmode == 1) { |
| 2918 | #else /* __U_BOOT__ */ |
| 2919 | if (!G.promptmode) { |
| 2920 | #endif /* __U_BOOT__ */ |
| 2921 | if (console_buffer[0] == '\n'&& G.flag_repeat == 0) { |
| 2922 | strcpy(the_command, console_buffer); |
| 2923 | } |
| 2924 | else { |
| 2925 | if (console_buffer[0] != '\n') { |
| 2926 | strcpy(the_command, console_buffer); |
| 2927 | G.flag_repeat = 1; |
| 2928 | } |
| 2929 | else { |
| 2930 | G.do_repeat = 1; |
| 2931 | } |
| 2932 | } |
| 2933 | i->p = the_command; |
| 2934 | } |
| 2935 | else { |
| 2936 | if (console_buffer[0] != '\n') { |
| 2937 | if (strlen(the_command) + strlen(console_buffer) |
| 2938 | < CONFIG_SYS_CBSIZE) { |
| 2939 | n = strlen(the_command); |
| 2940 | #ifdef __U_BOOT__ |
| 2941 | /* |
| 2942 | * To avoid writing to bad places, we check if |
| 2943 | * n is greater than 0. |
| 2944 | * This bug was found by Harald Seiler. |
| 2945 | */ |
| 2946 | if (n > 0) |
| 2947 | the_command[n-1] = ' '; |
| 2948 | strcpy(&the_command[n], console_buffer); |
| 2949 | #else /* !__U_BOOT__ */ |
| 2950 | the_command[n-1] = ' '; |
| 2951 | strcpy(&the_command[n], console_buffer); |
| 2952 | #endif /* !__U_BOOT__ */ |
| 2953 | } |
| 2954 | else { |
| 2955 | the_command[0] = '\n'; |
| 2956 | the_command[1] = '\0'; |
| 2957 | G.flag_repeat = 0; |
| 2958 | } |
| 2959 | } |
| 2960 | if (promptme == 0) { |
| 2961 | the_command[0] = '\n'; |
| 2962 | the_command[1] = '\0'; |
| 2963 | } |
| 2964 | i->p = console_buffer; |
| 2965 | } |
| 2966 | #endif /* __U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 2967 | } |
| 2968 | /* This is the magic location that prints prompts |
| 2969 | * and gets data back from the user */ |
| 2970 | static int fgetc_interactive(struct in_str *i) |
| 2971 | { |
| 2972 | int ch; |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 2973 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 2974 | /* If it's interactive stdin, get new line. */ |
| 2975 | if (G_interactive_fd && i->file == G.HFILE_stdin) { |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 2976 | #endif /* !__U_BOOT__ */ |
| 2977 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 2978 | /* Returns first char (or EOF), the rest is in i->p[] */ |
| 2979 | ch = get_user_input(i); |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 2980 | #else /* __U_BOOT__ */ |
| 2981 | /* Avoid garbage value and make clang happy. */ |
| 2982 | ch = 0; |
| 2983 | /* |
| 2984 | * get_user_input() does not return anything when used in |
| 2985 | * U-Boot. |
| 2986 | * So, we need to take the read character from i->p[]. |
| 2987 | */ |
| 2988 | get_user_input(i); |
| 2989 | if (i->p && *i->p) { |
| 2990 | ch = *i->p++; |
| 2991 | } |
| 2992 | #endif /* __U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 2993 | G.promptmode = 1; /* PS2 */ |
| 2994 | debug_printf_prompt("%s promptmode=%d\n", __func__, G.promptmode); |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 2995 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 2996 | } else { |
| 2997 | /* Not stdin: script file, sourced file, etc */ |
| 2998 | do ch = hfgetc(i->file); while (ch == '\0'); |
| 2999 | } |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 3000 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 3001 | return ch; |
| 3002 | } |
| 3003 | #else /* !INTERACTIVE */ |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 3004 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 3005 | static ALWAYS_INLINE int fgetc_interactive(struct in_str *i) |
| 3006 | { |
| 3007 | int ch; |
| 3008 | do ch = hfgetc(i->file); while (ch == '\0'); |
| 3009 | return ch; |
| 3010 | } |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 3011 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 3012 | #endif /* !INTERACTIVE */ |
| 3013 | |
| 3014 | static int i_getch(struct in_str *i) |
| 3015 | { |
| 3016 | int ch; |
| 3017 | |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 3018 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 3019 | if (!i->file) { |
| 3020 | /* string-based in_str */ |
| 3021 | ch = (unsigned char)*i->p; |
| 3022 | if (ch != '\0') { |
| 3023 | i->p++; |
| 3024 | i->last_char = ch; |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 3025 | #if ENABLE_HUSH_LINENO_VAR |
| 3026 | if (ch == '\n') { |
| 3027 | G.parse_lineno++; |
| 3028 | debug_printf_parse("G.parse_lineno++ = %u\n", G.parse_lineno); |
| 3029 | } |
| 3030 | #endif |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 3031 | return ch; |
| 3032 | } |
| 3033 | return EOF; |
| 3034 | } |
| 3035 | |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 3036 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 3037 | /* FILE-based in_str */ |
| 3038 | |
| 3039 | #if ENABLE_FEATURE_EDITING |
| 3040 | /* This can be stdin, check line editing char[] buffer */ |
| 3041 | if (i->p && *i->p != '\0') { |
| 3042 | ch = (unsigned char)*i->p++; |
| 3043 | goto out; |
Francis Laniel | 3b13faf | 2023-12-22 22:02:34 +0100 | [diff] [blame] | 3044 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 3045 | } |
Francis Laniel | 3b13faf | 2023-12-22 22:02:34 +0100 | [diff] [blame] | 3046 | #else /* __U_BOOT__ */ |
| 3047 | /* |
| 3048 | * There are two ways for command to be called: |
| 3049 | * 1. The first one is when they are typed by the user. |
| 3050 | * 2. The second one is through run_command() (NOTE command run |
| 3051 | * internally calls run_command()). |
| 3052 | * |
| 3053 | * In the second case, we do not get input from the user, so once we |
| 3054 | * get a '\0', it means we need to stop. |
| 3055 | * NOTE G.run_command_flags is only set on run_command call stack, so |
| 3056 | * we use this to know if we come from user input or run_command(). |
| 3057 | */ |
| 3058 | } else if (i->p && *i->p == '\0' && G.run_command_flags){ |
| 3059 | return EOF; |
| 3060 | } |
| 3061 | #endif /* __U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 3062 | #endif |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 3063 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 3064 | /* peek_buf[] is an int array, not char. Can contain EOF. */ |
| 3065 | ch = i->peek_buf[0]; |
| 3066 | if (ch != 0) { |
| 3067 | int ch2 = i->peek_buf[1]; |
| 3068 | i->peek_buf[0] = ch2; |
| 3069 | if (ch2 == 0) /* very likely, avoid redundant write */ |
| 3070 | goto out; |
| 3071 | i->peek_buf[1] = 0; |
| 3072 | goto out; |
| 3073 | } |
| 3074 | |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 3075 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 3076 | ch = fgetc_interactive(i); |
| 3077 | out: |
| 3078 | debug_printf("file_get: got '%c' %d\n", ch, ch); |
| 3079 | i->last_char = ch; |
| 3080 | #if ENABLE_HUSH_LINENO_VAR |
| 3081 | if (ch == '\n') { |
| 3082 | G.parse_lineno++; |
| 3083 | debug_printf_parse("G.parse_lineno++ = %u\n", G.parse_lineno); |
| 3084 | } |
| 3085 | #endif |
| 3086 | return ch; |
| 3087 | } |
| 3088 | |
| 3089 | static int i_peek(struct in_str *i) |
| 3090 | { |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 3091 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 3092 | int ch; |
| 3093 | |
| 3094 | if (!i->file) { |
| 3095 | /* string-based in_str */ |
| 3096 | /* Doesn't report EOF on NUL. None of the callers care. */ |
| 3097 | return (unsigned char)*i->p; |
| 3098 | } |
| 3099 | |
| 3100 | /* FILE-based in_str */ |
| 3101 | |
| 3102 | #if ENABLE_FEATURE_EDITING && ENABLE_HUSH_INTERACTIVE |
| 3103 | /* This can be stdin, check line editing char[] buffer */ |
| 3104 | if (i->p && *i->p != '\0') |
| 3105 | return (unsigned char)*i->p; |
| 3106 | #endif |
| 3107 | /* peek_buf[] is an int array, not char. Can contain EOF. */ |
| 3108 | ch = i->peek_buf[0]; |
| 3109 | if (ch != 0) |
| 3110 | return ch; |
| 3111 | |
| 3112 | /* Need to get a new char */ |
| 3113 | ch = fgetc_interactive(i); |
| 3114 | debug_printf("file_peek: got '%c' %d\n", ch, ch); |
| 3115 | |
| 3116 | /* Save it by either rolling back line editing buffer, or in i->peek_buf[0] */ |
| 3117 | #if ENABLE_FEATURE_EDITING && ENABLE_HUSH_INTERACTIVE |
| 3118 | if (i->p) { |
| 3119 | i->p -= 1; |
| 3120 | return ch; |
| 3121 | } |
| 3122 | #endif |
| 3123 | i->peek_buf[0] = ch; |
| 3124 | /*i->peek_buf[1] = 0; - already is */ |
| 3125 | return ch; |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 3126 | #else /* __U_BOOT__ */ |
| 3127 | /* string-based in_str */ |
| 3128 | /* Doesn't report EOF on NUL. None of the callers care. */ |
| 3129 | return (unsigned char)*i->p; |
| 3130 | #endif /* __U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 3131 | } |
| 3132 | |
| 3133 | /* Only ever called if i_peek() was called, and did not return EOF. |
| 3134 | * IOW: we know the previous peek saw an ordinary char, not EOF, not NUL, |
| 3135 | * not end-of-line. Therefore we never need to read a new editing line here. |
| 3136 | */ |
| 3137 | static int i_peek2(struct in_str *i) |
| 3138 | { |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 3139 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 3140 | int ch; |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 3141 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 3142 | |
| 3143 | /* There are two cases when i->p[] buffer exists. |
| 3144 | * (1) it's a string in_str. |
| 3145 | * (2) It's a file, and we have a saved line editing buffer. |
| 3146 | * In both cases, we know that i->p[0] exists and not NUL, and |
| 3147 | * the peek2 result is in i->p[1]. |
| 3148 | */ |
| 3149 | if (i->p) |
| 3150 | return (unsigned char)i->p[1]; |
| 3151 | |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 3152 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 3153 | /* Now we know it is a file-based in_str. */ |
| 3154 | |
| 3155 | /* peek_buf[] is an int array, not char. Can contain EOF. */ |
| 3156 | /* Is there 2nd char? */ |
| 3157 | ch = i->peek_buf[1]; |
| 3158 | if (ch == 0) { |
| 3159 | /* We did not read it yet, get it now */ |
| 3160 | do ch = hfgetc(i->file); while (ch == '\0'); |
| 3161 | i->peek_buf[1] = ch; |
| 3162 | } |
| 3163 | |
| 3164 | debug_printf("file_peek2: got '%c' %d\n", ch, ch); |
| 3165 | return ch; |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 3166 | #else |
| 3167 | return 0; |
| 3168 | #endif /* __U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 3169 | } |
| 3170 | |
| 3171 | static int i_getch_and_eat_bkslash_nl(struct in_str *input) |
| 3172 | { |
| 3173 | for (;;) { |
| 3174 | int ch, ch2; |
| 3175 | |
| 3176 | ch = i_getch(input); |
| 3177 | if (ch != '\\') |
| 3178 | return ch; |
| 3179 | ch2 = i_peek(input); |
| 3180 | if (ch2 != '\n') |
| 3181 | return ch; |
| 3182 | /* backslash+newline, skip it */ |
| 3183 | i_getch(input); |
| 3184 | } |
| 3185 | } |
| 3186 | |
| 3187 | /* Note: this function _eats_ \<newline> pairs, safe to use plain |
| 3188 | * i_getch() after it instead of i_getch_and_eat_bkslash_nl(). |
| 3189 | */ |
| 3190 | static int i_peek_and_eat_bkslash_nl(struct in_str *input) |
| 3191 | { |
| 3192 | for (;;) { |
| 3193 | int ch, ch2; |
| 3194 | |
| 3195 | ch = i_peek(input); |
| 3196 | if (ch != '\\') |
| 3197 | return ch; |
| 3198 | ch2 = i_peek2(input); |
| 3199 | if (ch2 != '\n') |
| 3200 | return ch; |
| 3201 | /* backslash+newline, skip it */ |
| 3202 | i_getch(input); |
| 3203 | i_getch(input); |
| 3204 | } |
| 3205 | } |
| 3206 | |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 3207 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 3208 | static void setup_file_in_str(struct in_str *i, HFILE *fp) |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 3209 | #else /* __U_BOOT__ */ |
| 3210 | static void setup_file_in_str(struct in_str *i) |
| 3211 | #endif /* __U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 3212 | { |
| 3213 | memset(i, 0, sizeof(*i)); |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 3214 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 3215 | i->file = fp; |
| 3216 | /* i->p = NULL; */ |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 3217 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 3218 | } |
| 3219 | |
| 3220 | static void setup_string_in_str(struct in_str *i, const char *s) |
| 3221 | { |
| 3222 | memset(i, 0, sizeof(*i)); |
| 3223 | /*i->file = NULL */; |
| 3224 | i->p = s; |
| 3225 | } |
| 3226 | |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 3227 | /* |
| 3228 | * o_string support |
| 3229 | */ |
| 3230 | #define B_CHUNK (32 * sizeof(char*)) |
| 3231 | |
| 3232 | static void o_reset_to_empty_unquoted(o_string *o) |
| 3233 | { |
| 3234 | o->length = 0; |
| 3235 | o->has_quoted_part = 0; |
| 3236 | if (o->data) |
| 3237 | o->data[0] = '\0'; |
| 3238 | } |
| 3239 | |
| 3240 | static void o_free_and_set_NULL(o_string *o) |
| 3241 | { |
| 3242 | free(o->data); |
| 3243 | memset(o, 0, sizeof(*o)); |
| 3244 | } |
| 3245 | |
| 3246 | static ALWAYS_INLINE void o_free(o_string *o) |
| 3247 | { |
| 3248 | free(o->data); |
| 3249 | } |
| 3250 | |
| 3251 | static void o_grow_by(o_string *o, int len) |
| 3252 | { |
| 3253 | if (o->length + len > o->maxlen) { |
| 3254 | o->maxlen += (2 * len) | (B_CHUNK-1); |
| 3255 | o->data = xrealloc(o->data, 1 + o->maxlen); |
| 3256 | } |
| 3257 | } |
| 3258 | |
| 3259 | static void o_addchr(o_string *o, int ch) |
| 3260 | { |
| 3261 | debug_printf("o_addchr: '%c' o->length=%d o=%p\n", ch, o->length, o); |
| 3262 | if (o->length < o->maxlen) { |
| 3263 | /* likely. avoid o_grow_by() call */ |
| 3264 | add: |
| 3265 | o->data[o->length] = ch; |
| 3266 | o->length++; |
| 3267 | o->data[o->length] = '\0'; |
| 3268 | return; |
| 3269 | } |
| 3270 | o_grow_by(o, 1); |
| 3271 | goto add; |
| 3272 | } |
| 3273 | |
| 3274 | #if 0 |
| 3275 | /* Valid only if we know o_string is not empty */ |
| 3276 | static void o_delchr(o_string *o) |
| 3277 | { |
| 3278 | o->length--; |
| 3279 | o->data[o->length] = '\0'; |
| 3280 | } |
| 3281 | #endif |
| 3282 | |
| 3283 | static void o_addblock(o_string *o, const char *str, int len) |
| 3284 | { |
| 3285 | o_grow_by(o, len); |
| 3286 | ((char*)mempcpy(&o->data[o->length], str, len))[0] = '\0'; |
| 3287 | o->length += len; |
| 3288 | } |
| 3289 | |
| 3290 | static void o_addstr(o_string *o, const char *str) |
| 3291 | { |
| 3292 | o_addblock(o, str, strlen(str)); |
| 3293 | } |
| 3294 | |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 3295 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 3296 | static void o_addstr_with_NUL(o_string *o, const char *str) |
| 3297 | { |
| 3298 | o_addblock(o, str, strlen(str) + 1); |
| 3299 | } |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 3300 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 3301 | |
| 3302 | #if !BB_MMU |
| 3303 | static void nommu_addchr(o_string *o, int ch) |
| 3304 | { |
| 3305 | if (o) |
| 3306 | o_addchr(o, ch); |
| 3307 | } |
| 3308 | #else |
| 3309 | # define nommu_addchr(o, str) ((void)0) |
| 3310 | #endif |
| 3311 | |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 3312 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 3313 | #if ENABLE_HUSH_MODE_X |
| 3314 | static void x_mode_addchr(int ch) |
| 3315 | { |
| 3316 | o_addchr(&G.x_mode_buf, ch); |
| 3317 | } |
| 3318 | static void x_mode_addstr(const char *str) |
| 3319 | { |
| 3320 | o_addstr(&G.x_mode_buf, str); |
| 3321 | } |
| 3322 | static void x_mode_addblock(const char *str, int len) |
| 3323 | { |
| 3324 | o_addblock(&G.x_mode_buf, str, len); |
| 3325 | } |
| 3326 | static void x_mode_prefix(void) |
| 3327 | { |
| 3328 | int n = G.x_mode_depth; |
| 3329 | do x_mode_addchr('+'); while (--n >= 0); |
| 3330 | } |
| 3331 | static void x_mode_flush(void) |
| 3332 | { |
| 3333 | int len = G.x_mode_buf.length; |
| 3334 | if (len <= 0) |
| 3335 | return; |
| 3336 | if (G.x_mode_fd > 0) { |
| 3337 | G.x_mode_buf.data[len] = '\n'; |
| 3338 | full_write(G.x_mode_fd, G.x_mode_buf.data, len + 1); |
| 3339 | } |
| 3340 | G.x_mode_buf.length = 0; |
| 3341 | } |
| 3342 | #endif |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 3343 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 3344 | |
| 3345 | /* |
| 3346 | * HUSH_BRACE_EXPANSION code needs corresponding quoting on variable expansion side. |
| 3347 | * Currently, "v='{q,w}'; echo $v" erroneously expands braces in $v. |
| 3348 | * Apparently, on unquoted $v bash still does globbing |
| 3349 | * ("v='*.txt'; echo $v" prints all .txt files), |
| 3350 | * but NOT brace expansion! Thus, there should be TWO independent |
| 3351 | * quoting mechanisms on $v expansion side: one protects |
| 3352 | * $v from brace expansion, and other additionally protects "$v" against globbing. |
| 3353 | * We have only second one. |
| 3354 | */ |
| 3355 | |
| 3356 | #if ENABLE_HUSH_BRACE_EXPANSION |
| 3357 | # define MAYBE_BRACES "{}" |
| 3358 | #else |
| 3359 | # define MAYBE_BRACES "" |
| 3360 | #endif |
| 3361 | |
| 3362 | /* My analysis of quoting semantics tells me that state information |
| 3363 | * is associated with a destination, not a source. |
| 3364 | */ |
| 3365 | static void o_addqchr(o_string *o, int ch) |
| 3366 | { |
| 3367 | int sz = 1; |
| 3368 | /* '-' is included because of this case: |
| 3369 | * >filename0 >filename1 >filename9; v='-'; echo filename[0"$v"9] |
| 3370 | */ |
| 3371 | char *found = strchr("*?[-\\" MAYBE_BRACES, ch); |
| 3372 | if (found) |
| 3373 | sz++; |
| 3374 | o_grow_by(o, sz); |
| 3375 | if (found) { |
| 3376 | o->data[o->length] = '\\'; |
| 3377 | o->length++; |
| 3378 | } |
| 3379 | o->data[o->length] = ch; |
| 3380 | o->length++; |
| 3381 | o->data[o->length] = '\0'; |
| 3382 | } |
| 3383 | |
| 3384 | static void o_addQchr(o_string *o, int ch) |
| 3385 | { |
| 3386 | int sz = 1; |
| 3387 | if ((o->o_expflags & EXP_FLAG_ESC_GLOB_CHARS) |
| 3388 | && strchr("*?[-\\" MAYBE_BRACES, ch) |
| 3389 | ) { |
| 3390 | sz++; |
| 3391 | o->data[o->length] = '\\'; |
| 3392 | o->length++; |
| 3393 | } |
| 3394 | o_grow_by(o, sz); |
| 3395 | o->data[o->length] = ch; |
| 3396 | o->length++; |
| 3397 | o->data[o->length] = '\0'; |
| 3398 | } |
| 3399 | |
| 3400 | static void o_addqblock(o_string *o, const char *str, int len) |
| 3401 | { |
| 3402 | while (len) { |
| 3403 | char ch; |
| 3404 | int sz; |
| 3405 | int ordinary_cnt = strcspn(str, "*?[-\\" MAYBE_BRACES); |
| 3406 | if (ordinary_cnt > len) /* paranoia */ |
| 3407 | ordinary_cnt = len; |
| 3408 | o_addblock(o, str, ordinary_cnt); |
| 3409 | if (ordinary_cnt == len) |
| 3410 | return; /* NUL is already added by o_addblock */ |
| 3411 | str += ordinary_cnt; |
| 3412 | len -= ordinary_cnt + 1; /* we are processing + 1 char below */ |
| 3413 | |
| 3414 | ch = *str++; |
| 3415 | sz = 1; |
| 3416 | if (ch) { /* it is necessarily one of "*?[-\\" MAYBE_BRACES */ |
| 3417 | sz++; |
| 3418 | o->data[o->length] = '\\'; |
| 3419 | o->length++; |
| 3420 | } |
| 3421 | o_grow_by(o, sz); |
| 3422 | o->data[o->length] = ch; |
| 3423 | o->length++; |
| 3424 | } |
| 3425 | o->data[o->length] = '\0'; |
| 3426 | } |
| 3427 | |
| 3428 | static void o_addQblock(o_string *o, const char *str, int len) |
| 3429 | { |
| 3430 | if (!(o->o_expflags & EXP_FLAG_ESC_GLOB_CHARS)) { |
| 3431 | o_addblock(o, str, len); |
| 3432 | return; |
| 3433 | } |
| 3434 | o_addqblock(o, str, len); |
| 3435 | } |
| 3436 | |
| 3437 | static void o_addQstr(o_string *o, const char *str) |
| 3438 | { |
| 3439 | o_addQblock(o, str, strlen(str)); |
| 3440 | } |
| 3441 | |
| 3442 | /* A special kind of o_string for $VAR and `cmd` expansion. |
| 3443 | * It contains char* list[] at the beginning, which is grown in 16 element |
| 3444 | * increments. Actual string data starts at the next multiple of 16 * (char*). |
| 3445 | * list[i] contains an INDEX (int!) into this string data. |
| 3446 | * It means that if list[] needs to grow, data needs to be moved higher up |
| 3447 | * but list[i]'s need not be modified. |
| 3448 | * NB: remembering how many list[i]'s you have there is crucial. |
| 3449 | * o_finalize_list() operation post-processes this structure - calculates |
| 3450 | * and stores actual char* ptrs in list[]. Oh, it NULL terminates it as well. |
| 3451 | */ |
| 3452 | #if DEBUG_EXPAND || DEBUG_GLOB |
| 3453 | static void debug_print_list(const char *prefix, o_string *o, int n) |
| 3454 | { |
| 3455 | char **list = (char**)o->data; |
| 3456 | int string_start = ((n + 0xf) & ~0xf) * sizeof(list[0]); |
| 3457 | int i = 0; |
| 3458 | |
| 3459 | indent(); |
| 3460 | fdprintf(2, "%s: list:%p n:%d string_start:%d length:%d maxlen:%d glob:%d quoted:%d escape:%d\n", |
| 3461 | prefix, list, n, string_start, o->length, o->maxlen, |
| 3462 | !!(o->o_expflags & EXP_FLAG_GLOB), |
| 3463 | o->has_quoted_part, |
| 3464 | !!(o->o_expflags & EXP_FLAG_ESC_GLOB_CHARS)); |
| 3465 | while (i < n) { |
| 3466 | indent(); |
| 3467 | fdprintf(2, " list[%d]=%d '%s' %p\n", i, (int)(uintptr_t)list[i], |
| 3468 | o->data + (int)(uintptr_t)list[i] + string_start, |
| 3469 | o->data + (int)(uintptr_t)list[i] + string_start); |
| 3470 | i++; |
| 3471 | } |
| 3472 | if (n) { |
| 3473 | const char *p = o->data + (int)(uintptr_t)list[n - 1] + string_start; |
| 3474 | indent(); |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 3475 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 3476 | fdprintf(2, " total_sz:%ld\n", (long)((p + strlen(p) + 1) - o->data)); |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 3477 | #else /* __U_BOOT__ */ |
| 3478 | printf(" total_sz:%ld\n", (long)((p + strlen(p) + 1) - o->data)); |
| 3479 | #endif /* __U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 3480 | } |
| 3481 | } |
| 3482 | #else |
| 3483 | # define debug_print_list(prefix, o, n) ((void)0) |
| 3484 | #endif |
| 3485 | |
| 3486 | /* n = o_save_ptr_helper(str, n) "starts new string" by storing an index value |
| 3487 | * in list[n] so that it points past last stored byte so far. |
| 3488 | * It returns n+1. */ |
| 3489 | static int o_save_ptr_helper(o_string *o, int n) |
| 3490 | { |
| 3491 | char **list = (char**)o->data; |
| 3492 | int string_start; |
| 3493 | int string_len; |
| 3494 | |
| 3495 | if (!o->has_empty_slot) { |
| 3496 | string_start = ((n + 0xf) & ~0xf) * sizeof(list[0]); |
| 3497 | string_len = o->length - string_start; |
| 3498 | if (!(n & 0xf)) { /* 0, 0x10, 0x20...? */ |
| 3499 | debug_printf_list("list[%d]=%d string_start=%d (growing)\n", n, string_len, string_start); |
| 3500 | /* list[n] points to string_start, make space for 16 more pointers */ |
| 3501 | o->maxlen += 0x10 * sizeof(list[0]); |
| 3502 | o->data = xrealloc(o->data, o->maxlen + 1); |
| 3503 | list = (char**)o->data; |
| 3504 | memmove(list + n + 0x10, list + n, string_len); |
| 3505 | /* |
| 3506 | * expand_on_ifs() has a "previous argv[] ends in IFS?" |
| 3507 | * check. (grep for -prev-ifs-check-). |
| 3508 | * Ensure that argv[-1][last] is not garbage |
| 3509 | * but zero bytes, to save index check there. |
| 3510 | */ |
| 3511 | list[n + 0x10 - 1] = 0; |
| 3512 | o->length += 0x10 * sizeof(list[0]); |
| 3513 | } else { |
| 3514 | debug_printf_list("list[%d]=%d string_start=%d\n", |
| 3515 | n, string_len, string_start); |
| 3516 | } |
| 3517 | } else { |
| 3518 | /* We have empty slot at list[n], reuse without growth */ |
| 3519 | string_start = ((n+1 + 0xf) & ~0xf) * sizeof(list[0]); /* NB: n+1! */ |
| 3520 | string_len = o->length - string_start; |
| 3521 | debug_printf_list("list[%d]=%d string_start=%d (empty slot)\n", |
| 3522 | n, string_len, string_start); |
| 3523 | o->has_empty_slot = 0; |
| 3524 | } |
| 3525 | o->has_quoted_part = 0; |
| 3526 | list[n] = (char*)(uintptr_t)string_len; |
| 3527 | return n + 1; |
| 3528 | } |
| 3529 | |
| 3530 | /* "What was our last o_save_ptr'ed position (byte offset relative o->data)?" */ |
| 3531 | static int o_get_last_ptr(o_string *o, int n) |
| 3532 | { |
| 3533 | char **list = (char**)o->data; |
| 3534 | int string_start = ((n + 0xf) & ~0xf) * sizeof(list[0]); |
| 3535 | |
| 3536 | return ((int)(uintptr_t)list[n-1]) + string_start; |
| 3537 | } |
| 3538 | |
| 3539 | /* |
| 3540 | * Globbing routines. |
| 3541 | * |
| 3542 | * Most words in commands need to be globbed, even ones which are |
| 3543 | * (single or double) quoted. This stems from the possiblity of |
| 3544 | * constructs like "abc"* and 'abc'* - these should be globbed. |
| 3545 | * Having a different code path for fully-quoted strings ("abc", |
| 3546 | * 'abc') would only help performance-wise, but we still need |
| 3547 | * code for partially-quoted strings. |
| 3548 | * |
| 3549 | * Unfortunately, if we want to match bash and ash behavior in all cases, |
| 3550 | * the logic can't be "shell-syntax argument is first transformed |
| 3551 | * to a string, then globbed, and if globbing does not match anything, |
| 3552 | * it is used verbatim". Here are two examples where it fails: |
| 3553 | * |
| 3554 | * echo 'b\*'? |
| 3555 | * |
| 3556 | * The globbing can't be avoided (because of '?' at the end). |
| 3557 | * The glob pattern is: b\\\*? - IOW, both \ and * are literals |
| 3558 | * and are glob-escaped. If this does not match, bash/ash print b\*? |
| 3559 | * - IOW: they "unbackslash" the glob pattern. |
| 3560 | * Now, look at this: |
| 3561 | * |
| 3562 | * v='\\\*'; echo b$v? |
| 3563 | * |
| 3564 | * The glob pattern is the same here: b\\\*? - the unquoted $v expansion |
| 3565 | * should be used as glob pattern with no changes. However, if glob |
| 3566 | * does not match, bash/ash print b\\\*? - NOT THE SAME as first example! |
| 3567 | * |
| 3568 | * ash implements this by having an encoded representation of the word |
| 3569 | * to glob, which IS NOT THE SAME as the glob pattern - it has more data. |
| 3570 | * Glob pattern is derived from it. If glob fails, the decision what result |
| 3571 | * should be is made using that encoded representation. Not glob pattern. |
| 3572 | */ |
| 3573 | |
| 3574 | #if ENABLE_HUSH_BRACE_EXPANSION |
| 3575 | /* There in a GNU extension, GLOB_BRACE, but it is not usable: |
| 3576 | * first, it processes even {a} (no commas), second, |
| 3577 | * I didn't manage to make it return strings when they don't match |
| 3578 | * existing files. Need to re-implement it. |
| 3579 | */ |
| 3580 | |
| 3581 | /* Helper */ |
| 3582 | static int glob_needed(const char *s) |
| 3583 | { |
| 3584 | while (*s) { |
| 3585 | if (*s == '\\') { |
| 3586 | if (!s[1]) |
| 3587 | return 0; |
| 3588 | s += 2; |
| 3589 | continue; |
| 3590 | } |
| 3591 | if (*s == '*' || *s == '[' || *s == '?' || *s == '{') |
| 3592 | return 1; |
| 3593 | s++; |
| 3594 | } |
| 3595 | return 0; |
| 3596 | } |
| 3597 | /* Return pointer to next closing brace or to comma */ |
| 3598 | static const char *next_brace_sub(const char *cp) |
| 3599 | { |
| 3600 | unsigned depth = 0; |
| 3601 | cp++; |
| 3602 | while (*cp != '\0') { |
| 3603 | if (*cp == '\\') { |
| 3604 | if (*++cp == '\0') |
| 3605 | break; |
| 3606 | cp++; |
| 3607 | continue; |
| 3608 | } |
| 3609 | if ((*cp == '}' && depth-- == 0) || (*cp == ',' && depth == 0)) |
| 3610 | break; |
| 3611 | if (*cp++ == '{') |
| 3612 | depth++; |
| 3613 | } |
| 3614 | |
| 3615 | return *cp != '\0' ? cp : NULL; |
| 3616 | } |
| 3617 | /* Recursive brace globber. Note: may garble pattern[]. */ |
| 3618 | static int glob_brace(char *pattern, o_string *o, int n) |
| 3619 | { |
| 3620 | char *new_pattern_buf; |
| 3621 | const char *begin; |
| 3622 | const char *next; |
| 3623 | const char *rest; |
| 3624 | const char *p; |
| 3625 | size_t rest_len; |
| 3626 | |
| 3627 | debug_printf_glob("glob_brace('%s')\n", pattern); |
| 3628 | |
| 3629 | begin = pattern; |
| 3630 | while (1) { |
| 3631 | if (*begin == '\0') |
| 3632 | goto simple_glob; |
| 3633 | if (*begin == '{') { |
| 3634 | /* Find the first sub-pattern and at the same time |
| 3635 | * find the rest after the closing brace */ |
| 3636 | next = next_brace_sub(begin); |
| 3637 | if (next == NULL) { |
| 3638 | /* An illegal expression */ |
| 3639 | goto simple_glob; |
| 3640 | } |
| 3641 | if (*next == '}') { |
| 3642 | /* "{abc}" with no commas - illegal |
| 3643 | * brace expr, disregard and skip it */ |
| 3644 | begin = next + 1; |
| 3645 | continue; |
| 3646 | } |
| 3647 | break; |
| 3648 | } |
| 3649 | if (*begin == '\\' && begin[1] != '\0') |
| 3650 | begin++; |
| 3651 | begin++; |
| 3652 | } |
| 3653 | debug_printf_glob("begin:%s\n", begin); |
| 3654 | debug_printf_glob("next:%s\n", next); |
| 3655 | |
| 3656 | /* Now find the end of the whole brace expression */ |
| 3657 | rest = next; |
| 3658 | while (*rest != '}') { |
| 3659 | rest = next_brace_sub(rest); |
| 3660 | if (rest == NULL) { |
| 3661 | /* An illegal expression */ |
| 3662 | goto simple_glob; |
| 3663 | } |
| 3664 | debug_printf_glob("rest:%s\n", rest); |
| 3665 | } |
| 3666 | rest_len = strlen(++rest) + 1; |
| 3667 | |
| 3668 | /* We are sure the brace expression is well-formed */ |
| 3669 | |
| 3670 | /* Allocate working buffer large enough for our work */ |
| 3671 | new_pattern_buf = xmalloc(strlen(pattern)); |
| 3672 | |
| 3673 | /* We have a brace expression. BEGIN points to the opening {, |
| 3674 | * NEXT points past the terminator of the first element, and REST |
| 3675 | * points past the final }. We will accumulate result names from |
| 3676 | * recursive runs for each brace alternative in the buffer using |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 3677 | * GLOB_APPEND. */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 3678 | |
| 3679 | p = begin + 1; |
| 3680 | while (1) { |
| 3681 | /* Construct the new glob expression */ |
| 3682 | memcpy( |
| 3683 | mempcpy( |
| 3684 | mempcpy(new_pattern_buf, |
| 3685 | /* We know the prefix for all sub-patterns */ |
| 3686 | pattern, begin - pattern), |
| 3687 | p, next - p), |
| 3688 | rest, rest_len); |
| 3689 | |
| 3690 | /* Note: glob_brace() may garble new_pattern_buf[]. |
| 3691 | * That's why we re-copy prefix every time (1st memcpy above). |
| 3692 | */ |
| 3693 | n = glob_brace(new_pattern_buf, o, n); |
| 3694 | if (*next == '}') { |
| 3695 | /* We saw the last entry */ |
| 3696 | break; |
| 3697 | } |
| 3698 | p = next + 1; |
| 3699 | next = next_brace_sub(next); |
| 3700 | } |
| 3701 | free(new_pattern_buf); |
| 3702 | return n; |
| 3703 | |
| 3704 | simple_glob: |
| 3705 | { |
| 3706 | int gr; |
| 3707 | glob_t globdata; |
| 3708 | |
| 3709 | memset(&globdata, 0, sizeof(globdata)); |
| 3710 | gr = glob(pattern, 0, NULL, &globdata); |
| 3711 | debug_printf_glob("glob('%s'):%d\n", pattern, gr); |
| 3712 | if (gr != 0) { |
| 3713 | if (gr == GLOB_NOMATCH) { |
| 3714 | globfree(&globdata); |
| 3715 | /* NB: garbles parameter */ |
| 3716 | unbackslash(pattern); |
| 3717 | o_addstr_with_NUL(o, pattern); |
| 3718 | debug_printf_glob("glob pattern '%s' is literal\n", pattern); |
| 3719 | return o_save_ptr_helper(o, n); |
| 3720 | } |
| 3721 | if (gr == GLOB_NOSPACE) |
| 3722 | bb_die_memory_exhausted(); |
| 3723 | /* GLOB_ABORTED? Only happens with GLOB_ERR flag, |
| 3724 | * but we didn't specify it. Paranoia again. */ |
| 3725 | bb_error_msg_and_die("glob error %d on '%s'", gr, pattern); |
| 3726 | } |
| 3727 | if (globdata.gl_pathv && globdata.gl_pathv[0]) { |
| 3728 | char **argv = globdata.gl_pathv; |
| 3729 | while (1) { |
| 3730 | o_addstr_with_NUL(o, *argv); |
| 3731 | n = o_save_ptr_helper(o, n); |
| 3732 | argv++; |
| 3733 | if (!*argv) |
| 3734 | break; |
| 3735 | } |
| 3736 | } |
| 3737 | globfree(&globdata); |
| 3738 | } |
| 3739 | return n; |
| 3740 | } |
| 3741 | /* Performs globbing on last list[], |
| 3742 | * saving each result as a new list[]. |
| 3743 | */ |
| 3744 | static int perform_glob(o_string *o, int n) |
| 3745 | { |
| 3746 | char *pattern, *copy; |
| 3747 | |
| 3748 | debug_printf_glob("start perform_glob: n:%d o->data:%p\n", n, o->data); |
| 3749 | if (!o->data) |
| 3750 | return o_save_ptr_helper(o, n); |
| 3751 | pattern = o->data + o_get_last_ptr(o, n); |
| 3752 | debug_printf_glob("glob pattern '%s'\n", pattern); |
| 3753 | if (!glob_needed(pattern)) { |
| 3754 | /* unbackslash last string in o in place, fix length */ |
| 3755 | o->length = unbackslash(pattern) - o->data; |
| 3756 | debug_printf_glob("glob pattern '%s' is literal\n", pattern); |
| 3757 | return o_save_ptr_helper(o, n); |
| 3758 | } |
| 3759 | |
| 3760 | copy = xstrdup(pattern); |
| 3761 | /* "forget" pattern in o */ |
| 3762 | o->length = pattern - o->data; |
| 3763 | n = glob_brace(copy, o, n); |
| 3764 | free(copy); |
| 3765 | if (DEBUG_GLOB) |
| 3766 | debug_print_list("perform_glob returning", o, n); |
| 3767 | return n; |
| 3768 | } |
| 3769 | |
| 3770 | #else /* !HUSH_BRACE_EXPANSION */ |
| 3771 | |
| 3772 | /* Helper */ |
| 3773 | static int glob_needed(const char *s) |
| 3774 | { |
| 3775 | while (*s) { |
| 3776 | if (*s == '\\') { |
| 3777 | if (!s[1]) |
| 3778 | return 0; |
| 3779 | s += 2; |
| 3780 | continue; |
| 3781 | } |
| 3782 | if (*s == '*' || *s == '[' || *s == '?') |
| 3783 | return 1; |
| 3784 | s++; |
| 3785 | } |
| 3786 | return 0; |
| 3787 | } |
| 3788 | /* Performs globbing on last list[], |
| 3789 | * saving each result as a new list[]. |
| 3790 | */ |
| 3791 | static int perform_glob(o_string *o, int n) |
| 3792 | { |
Francis Laniel | 74e4254 | 2023-12-22 22:02:33 +0100 | [diff] [blame] | 3793 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 3794 | glob_t globdata; |
| 3795 | int gr; |
Francis Laniel | 74e4254 | 2023-12-22 22:02:33 +0100 | [diff] [blame] | 3796 | #endif /* __U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 3797 | char *pattern; |
| 3798 | |
| 3799 | debug_printf_glob("start perform_glob: n:%d o->data:%p\n", n, o->data); |
| 3800 | if (!o->data) |
| 3801 | return o_save_ptr_helper(o, n); |
| 3802 | pattern = o->data + o_get_last_ptr(o, n); |
| 3803 | debug_printf_glob("glob pattern '%s'\n", pattern); |
| 3804 | if (!glob_needed(pattern)) { |
Francis Laniel | 74e4254 | 2023-12-22 22:02:33 +0100 | [diff] [blame] | 3805 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 3806 | literal: |
Francis Laniel | 74e4254 | 2023-12-22 22:02:33 +0100 | [diff] [blame] | 3807 | #endif /* __U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 3808 | /* unbackslash last string in o in place, fix length */ |
| 3809 | o->length = unbackslash(pattern) - o->data; |
| 3810 | debug_printf_glob("glob pattern '%s' is literal\n", pattern); |
| 3811 | return o_save_ptr_helper(o, n); |
| 3812 | } |
| 3813 | |
Francis Laniel | 74e4254 | 2023-12-22 22:02:33 +0100 | [diff] [blame] | 3814 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 3815 | memset(&globdata, 0, sizeof(globdata)); |
| 3816 | /* Can't use GLOB_NOCHECK: it does not unescape the string. |
| 3817 | * If we glob "*.\*" and don't find anything, we need |
| 3818 | * to fall back to using literal "*.*", but GLOB_NOCHECK |
| 3819 | * will return "*.\*"! |
| 3820 | */ |
| 3821 | gr = glob(pattern, 0, NULL, &globdata); |
| 3822 | debug_printf_glob("glob('%s'):%d\n", pattern, gr); |
| 3823 | if (gr != 0) { |
| 3824 | if (gr == GLOB_NOMATCH) { |
| 3825 | globfree(&globdata); |
| 3826 | goto literal; |
| 3827 | } |
| 3828 | if (gr == GLOB_NOSPACE) |
| 3829 | bb_die_memory_exhausted(); |
| 3830 | /* GLOB_ABORTED? Only happens with GLOB_ERR flag, |
| 3831 | * but we didn't specify it. Paranoia again. */ |
| 3832 | bb_error_msg_and_die("glob error %d on '%s'", gr, pattern); |
| 3833 | } |
| 3834 | if (globdata.gl_pathv && globdata.gl_pathv[0]) { |
| 3835 | char **argv = globdata.gl_pathv; |
| 3836 | /* "forget" pattern in o */ |
| 3837 | o->length = pattern - o->data; |
| 3838 | while (1) { |
| 3839 | o_addstr_with_NUL(o, *argv); |
| 3840 | n = o_save_ptr_helper(o, n); |
| 3841 | argv++; |
| 3842 | if (!*argv) |
| 3843 | break; |
| 3844 | } |
| 3845 | } |
| 3846 | globfree(&globdata); |
| 3847 | if (DEBUG_GLOB) |
| 3848 | debug_print_list("perform_glob returning", o, n); |
| 3849 | return n; |
Francis Laniel | 74e4254 | 2023-12-22 22:02:33 +0100 | [diff] [blame] | 3850 | #else /* __U_BOOT__ */ |
| 3851 | /* |
| 3852 | * NOTE We only use perform glob to call unbackslash to remove backslash |
| 3853 | * from string once expanded. |
| 3854 | * So, it seems OK to return this if no previous return was done. |
| 3855 | */ |
| 3856 | return o_save_ptr_helper(o, n); |
| 3857 | #endif /* __U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 3858 | } |
| 3859 | |
| 3860 | #endif /* !HUSH_BRACE_EXPANSION */ |
| 3861 | |
| 3862 | /* If o->o_expflags & EXP_FLAG_GLOB, glob the string so far remembered. |
| 3863 | * Otherwise, just finish current list[] and start new */ |
| 3864 | static int o_save_ptr(o_string *o, int n) |
| 3865 | { |
| 3866 | if (o->o_expflags & EXP_FLAG_GLOB) { |
| 3867 | /* If o->has_empty_slot, list[n] was already globbed |
| 3868 | * (if it was requested back then when it was filled) |
| 3869 | * so don't do that again! */ |
| 3870 | if (!o->has_empty_slot) |
| 3871 | return perform_glob(o, n); /* o_save_ptr_helper is inside */ |
| 3872 | } |
| 3873 | return o_save_ptr_helper(o, n); |
| 3874 | } |
| 3875 | |
| 3876 | /* "Please convert list[n] to real char* ptrs, and NULL terminate it." */ |
| 3877 | static char **o_finalize_list(o_string *o, int n) |
| 3878 | { |
| 3879 | char **list; |
| 3880 | int string_start; |
| 3881 | |
| 3882 | if (DEBUG_EXPAND) |
| 3883 | debug_print_list("finalized", o, n); |
| 3884 | debug_printf_expand("finalized n:%d\n", n); |
| 3885 | list = (char**)o->data; |
| 3886 | string_start = ((n + 0xf) & ~0xf) * sizeof(list[0]); |
| 3887 | list[--n] = NULL; |
| 3888 | while (n) { |
| 3889 | n--; |
| 3890 | list[n] = o->data + (int)(uintptr_t)list[n] + string_start; |
| 3891 | } |
| 3892 | return list; |
| 3893 | } |
| 3894 | |
| 3895 | static void free_pipe_list(struct pipe *pi); |
| 3896 | |
| 3897 | /* Returns pi->next - next pipe in the list */ |
| 3898 | static struct pipe *free_pipe(struct pipe *pi) |
| 3899 | { |
| 3900 | struct pipe *next; |
| 3901 | int i; |
| 3902 | |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 3903 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 3904 | debug_printf_clean("free_pipe (pid %d)\n", getpid()); |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 3905 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 3906 | for (i = 0; i < pi->num_cmds; i++) { |
| 3907 | struct command *command; |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 3908 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 3909 | struct redir_struct *r, *rnext; |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 3910 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 3911 | |
| 3912 | command = &pi->cmds[i]; |
| 3913 | debug_printf_clean(" command %d:\n", i); |
| 3914 | if (command->argv) { |
| 3915 | if (DEBUG_CLEAN) { |
| 3916 | int a; |
| 3917 | char **p; |
| 3918 | for (a = 0, p = command->argv; *p; a++, p++) { |
| 3919 | debug_printf_clean(" argv[%d] = %s\n", a, *p); |
| 3920 | } |
| 3921 | } |
| 3922 | free_strings(command->argv); |
| 3923 | //command->argv = NULL; |
| 3924 | } |
| 3925 | /* not "else if": on syntax error, we may have both! */ |
| 3926 | if (command->group) { |
| 3927 | debug_printf_clean(" begin group (cmd_type:%d)\n", |
| 3928 | command->cmd_type); |
| 3929 | free_pipe_list(command->group); |
| 3930 | debug_printf_clean(" end group\n"); |
| 3931 | //command->group = NULL; |
| 3932 | } |
| 3933 | /* else is crucial here. |
| 3934 | * If group != NULL, child_func is meaningless */ |
| 3935 | #if ENABLE_HUSH_FUNCTIONS |
| 3936 | else if (command->child_func) { |
| 3937 | debug_printf_exec("cmd %p releases child func at %p\n", command, command->child_func); |
| 3938 | command->child_func->parent_cmd = NULL; |
| 3939 | } |
| 3940 | #endif |
| 3941 | #if !BB_MMU |
| 3942 | free(command->group_as_string); |
| 3943 | //command->group_as_string = NULL; |
| 3944 | #endif |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 3945 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 3946 | for (r = command->redirects; r; r = rnext) { |
| 3947 | debug_printf_clean(" redirect %d%s", |
| 3948 | r->rd_fd, redir_table[r->rd_type].descrip); |
| 3949 | /* guard against the case >$FOO, where foo is unset or blank */ |
| 3950 | if (r->rd_filename) { |
| 3951 | debug_printf_clean(" fname:'%s'\n", r->rd_filename); |
| 3952 | free(r->rd_filename); |
| 3953 | //r->rd_filename = NULL; |
| 3954 | } |
| 3955 | debug_printf_clean(" rd_dup:%d\n", r->rd_dup); |
| 3956 | rnext = r->next; |
| 3957 | free(r); |
| 3958 | } |
| 3959 | //command->redirects = NULL; |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 3960 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 3961 | } |
| 3962 | free(pi->cmds); /* children are an array, they get freed all at once */ |
| 3963 | //pi->cmds = NULL; |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 3964 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 3965 | #if ENABLE_HUSH_JOB |
| 3966 | free(pi->cmdtext); |
| 3967 | //pi->cmdtext = NULL; |
| 3968 | #endif |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 3969 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 3970 | |
| 3971 | next = pi->next; |
| 3972 | free(pi); |
| 3973 | return next; |
| 3974 | } |
| 3975 | |
| 3976 | static void free_pipe_list(struct pipe *pi) |
| 3977 | { |
| 3978 | while (pi) { |
| 3979 | #if HAS_KEYWORDS |
| 3980 | debug_printf_clean("pipe reserved word %d\n", pi->res_word); |
| 3981 | #endif |
| 3982 | debug_printf_clean("pipe followup code %d\n", pi->followup); |
| 3983 | pi = free_pipe(pi); |
| 3984 | } |
| 3985 | } |
| 3986 | |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 3987 | /*** Parsing routines ***/ |
| 3988 | |
| 3989 | #ifndef debug_print_tree |
| 3990 | static void debug_print_tree(struct pipe *pi, int lvl) |
| 3991 | { |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 3992 | static const char *const PIPE[] ALIGN_PTR = { |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 3993 | [PIPE_SEQ] = "SEQ", |
| 3994 | [PIPE_AND] = "AND", |
| 3995 | [PIPE_OR ] = "OR" , |
| 3996 | [PIPE_BG ] = "BG" , |
| 3997 | }; |
| 3998 | static const char *RES[] = { |
| 3999 | [RES_NONE ] = "NONE" , |
| 4000 | # if ENABLE_HUSH_IF |
| 4001 | [RES_IF ] = "IF" , |
| 4002 | [RES_THEN ] = "THEN" , |
| 4003 | [RES_ELIF ] = "ELIF" , |
| 4004 | [RES_ELSE ] = "ELSE" , |
| 4005 | [RES_FI ] = "FI" , |
| 4006 | # endif |
| 4007 | # if ENABLE_HUSH_LOOPS |
| 4008 | [RES_FOR ] = "FOR" , |
| 4009 | [RES_WHILE] = "WHILE", |
| 4010 | [RES_UNTIL] = "UNTIL", |
| 4011 | [RES_DO ] = "DO" , |
| 4012 | [RES_DONE ] = "DONE" , |
| 4013 | # endif |
| 4014 | # if ENABLE_HUSH_LOOPS || ENABLE_HUSH_CASE |
| 4015 | [RES_IN ] = "IN" , |
| 4016 | # endif |
| 4017 | # if ENABLE_HUSH_CASE |
| 4018 | [RES_CASE ] = "CASE" , |
| 4019 | [RES_CASE_IN ] = "CASE_IN" , |
| 4020 | [RES_MATCH] = "MATCH", |
| 4021 | [RES_CASE_BODY] = "CASE_BODY", |
| 4022 | [RES_ESAC ] = "ESAC" , |
| 4023 | # endif |
| 4024 | [RES_XXXX ] = "XXXX" , |
| 4025 | [RES_SNTX ] = "SNTX" , |
| 4026 | }; |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 4027 | static const char *const CMDTYPE[] ALIGN_PTR = { |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 4028 | "{}", |
| 4029 | "()", |
| 4030 | "[noglob]", |
| 4031 | # if ENABLE_HUSH_FUNCTIONS |
| 4032 | "func()", |
| 4033 | # endif |
| 4034 | }; |
| 4035 | |
| 4036 | int pin, prn; |
| 4037 | |
| 4038 | pin = 0; |
| 4039 | while (pi) { |
| 4040 | fdprintf(2, "%*spipe %d #cmds:%d %sres_word=%s followup=%d %s\n", |
| 4041 | lvl*2, "", |
| 4042 | pin, |
| 4043 | pi->num_cmds, |
| 4044 | (IF_HAS_KEYWORDS(pi->pi_inverted ? "! " :) ""), |
| 4045 | RES[pi->res_word], |
| 4046 | pi->followup, PIPE[pi->followup] |
| 4047 | ); |
| 4048 | prn = 0; |
| 4049 | while (prn < pi->num_cmds) { |
| 4050 | struct command *command = &pi->cmds[prn]; |
| 4051 | char **argv = command->argv; |
| 4052 | |
| 4053 | fdprintf(2, "%*s cmd %d assignment_cnt:%d", |
| 4054 | lvl*2, "", prn, |
| 4055 | command->assignment_cnt); |
| 4056 | # if ENABLE_HUSH_LINENO_VAR |
| 4057 | fdprintf(2, " LINENO:%u", command->lineno); |
| 4058 | # endif |
| 4059 | if (command->group) { |
| 4060 | fdprintf(2, " group %s: (argv=%p)%s%s\n", |
| 4061 | CMDTYPE[command->cmd_type], |
| 4062 | argv |
| 4063 | # if !BB_MMU |
| 4064 | , " group_as_string:", command->group_as_string |
| 4065 | # else |
| 4066 | , "", "" |
| 4067 | # endif |
| 4068 | ); |
| 4069 | debug_print_tree(command->group, lvl+1); |
| 4070 | prn++; |
| 4071 | continue; |
| 4072 | } |
| 4073 | if (argv) while (*argv) { |
| 4074 | fdprintf(2, " '%s'", *argv); |
| 4075 | argv++; |
| 4076 | } |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 4077 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 4078 | if (command->redirects) |
| 4079 | fdprintf(2, " {redir}"); |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 4080 | #endif /* __U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 4081 | fdprintf(2, "\n"); |
| 4082 | prn++; |
| 4083 | } |
| 4084 | pi = pi->next; |
| 4085 | pin++; |
| 4086 | } |
| 4087 | } |
| 4088 | #endif /* debug_print_tree */ |
| 4089 | |
| 4090 | static struct pipe *new_pipe(void) |
| 4091 | { |
| 4092 | struct pipe *pi; |
| 4093 | pi = xzalloc(sizeof(struct pipe)); |
| 4094 | /*pi->res_word = RES_NONE; - RES_NONE is 0 anyway */ |
| 4095 | return pi; |
| 4096 | } |
| 4097 | |
| 4098 | /* Command (member of a pipe) is complete, or we start a new pipe |
| 4099 | * if ctx->command is NULL. |
| 4100 | * No errors possible here. |
| 4101 | */ |
| 4102 | static int done_command(struct parse_context *ctx) |
| 4103 | { |
| 4104 | /* The command is really already in the pipe structure, so |
| 4105 | * advance the pipe counter and make a new, null command. */ |
| 4106 | struct pipe *pi = ctx->pipe; |
| 4107 | struct command *command = ctx->command; |
| 4108 | |
| 4109 | #if 0 /* Instead we emit error message at run time */ |
| 4110 | if (ctx->pending_redirect) { |
| 4111 | /* For example, "cmd >" (no filename to redirect to) */ |
| 4112 | syntax_error("invalid redirect"); |
| 4113 | ctx->pending_redirect = NULL; |
| 4114 | } |
| 4115 | #endif |
| 4116 | |
| 4117 | if (command) { |
| 4118 | if (IS_NULL_CMD(command)) { |
| 4119 | debug_printf_parse("done_command: skipping null cmd, num_cmds=%d\n", pi->num_cmds); |
| 4120 | goto clear_and_ret; |
| 4121 | } |
| 4122 | pi->num_cmds++; |
| 4123 | debug_printf_parse("done_command: ++num_cmds=%d\n", pi->num_cmds); |
| 4124 | //debug_print_tree(ctx->list_head, 20); |
| 4125 | } else { |
| 4126 | debug_printf_parse("done_command: initializing, num_cmds=%d\n", pi->num_cmds); |
| 4127 | } |
| 4128 | |
| 4129 | /* Only real trickiness here is that the uncommitted |
| 4130 | * command structure is not counted in pi->num_cmds. */ |
| 4131 | pi->cmds = xrealloc(pi->cmds, sizeof(*pi->cmds) * (pi->num_cmds+1)); |
| 4132 | ctx->command = command = &pi->cmds[pi->num_cmds]; |
| 4133 | clear_and_ret: |
| 4134 | memset(command, 0, sizeof(*command)); |
| 4135 | #if ENABLE_HUSH_LINENO_VAR |
| 4136 | command->lineno = G.parse_lineno; |
| 4137 | debug_printf_parse("command->lineno = G.parse_lineno (%u)\n", G.parse_lineno); |
| 4138 | #endif |
| 4139 | return pi->num_cmds; /* used only for 0/nonzero check */ |
| 4140 | } |
| 4141 | |
| 4142 | static void done_pipe(struct parse_context *ctx, pipe_style type) |
| 4143 | { |
| 4144 | int not_null; |
| 4145 | |
| 4146 | debug_printf_parse("done_pipe entered, followup %d\n", type); |
| 4147 | /* Close previous command */ |
| 4148 | not_null = done_command(ctx); |
| 4149 | #if HAS_KEYWORDS |
| 4150 | ctx->pipe->pi_inverted = ctx->ctx_inverted; |
| 4151 | ctx->ctx_inverted = 0; |
| 4152 | ctx->pipe->res_word = ctx->ctx_res_w; |
| 4153 | #endif |
| 4154 | if (type == PIPE_BG && ctx->list_head != ctx->pipe) { |
| 4155 | /* Necessary since && and || have precedence over &: |
| 4156 | * "cmd1 && cmd2 &" must spawn both cmds, not only cmd2, |
| 4157 | * in a backgrounded subshell. |
| 4158 | */ |
| 4159 | struct pipe *pi; |
| 4160 | struct command *command; |
| 4161 | |
| 4162 | /* Is this actually this construct, all pipes end with && or ||? */ |
| 4163 | pi = ctx->list_head; |
| 4164 | while (pi != ctx->pipe) { |
| 4165 | if (pi->followup != PIPE_AND && pi->followup != PIPE_OR) |
| 4166 | goto no_conv; |
| 4167 | pi = pi->next; |
| 4168 | } |
| 4169 | |
| 4170 | debug_printf_parse("BG with more than one pipe, converting to { p1 &&...pN; } &\n"); |
| 4171 | pi->followup = PIPE_SEQ; /* close pN _not_ with "&"! */ |
| 4172 | pi = xzalloc(sizeof(*pi)); |
| 4173 | pi->followup = PIPE_BG; |
| 4174 | pi->num_cmds = 1; |
| 4175 | pi->cmds = xzalloc(sizeof(pi->cmds[0])); |
| 4176 | command = &pi->cmds[0]; |
| 4177 | if (CMD_NORMAL != 0) /* "if xzalloc didn't do that already" */ |
| 4178 | command->cmd_type = CMD_NORMAL; |
| 4179 | command->group = ctx->list_head; |
| 4180 | #if !BB_MMU |
| 4181 | command->group_as_string = xstrndup( |
| 4182 | ctx->as_string.data, |
| 4183 | ctx->as_string.length - 1 /* do not copy last char, "&" */ |
| 4184 | ); |
| 4185 | #endif |
| 4186 | /* Replace all pipes in ctx with one newly created */ |
| 4187 | ctx->list_head = ctx->pipe = pi; |
| 4188 | /* for cases like "cmd && &", do not be tricked by last command |
| 4189 | * being null - the entire {...} & is NOT null! */ |
| 4190 | not_null = 1; |
| 4191 | } else { |
| 4192 | no_conv: |
| 4193 | ctx->pipe->followup = type; |
| 4194 | } |
| 4195 | |
| 4196 | /* Without this check, even just <enter> on command line generates |
| 4197 | * tree of three NOPs (!). Which is harmless but annoying. |
| 4198 | * IOW: it is safe to do it unconditionally. */ |
| 4199 | if (not_null |
| 4200 | #if ENABLE_HUSH_IF |
| 4201 | || ctx->ctx_res_w == RES_FI |
| 4202 | #endif |
| 4203 | #if ENABLE_HUSH_LOOPS |
| 4204 | || ctx->ctx_res_w == RES_DONE |
| 4205 | || ctx->ctx_res_w == RES_FOR |
| 4206 | || ctx->ctx_res_w == RES_IN |
| 4207 | #endif |
| 4208 | #if ENABLE_HUSH_CASE |
| 4209 | || ctx->ctx_res_w == RES_ESAC |
| 4210 | #endif |
| 4211 | ) { |
| 4212 | struct pipe *new_p; |
| 4213 | debug_printf_parse("done_pipe: adding new pipe: " |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 4214 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 4215 | "not_null:%d ctx->ctx_res_w:%d\n", |
| 4216 | not_null, ctx->ctx_res_w); |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 4217 | #else /* __U_BOOT__ */ |
| 4218 | "not_null:%d\n", |
| 4219 | not_null); |
| 4220 | #endif /* __U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 4221 | new_p = new_pipe(); |
| 4222 | ctx->pipe->next = new_p; |
| 4223 | ctx->pipe = new_p; |
| 4224 | /* RES_THEN, RES_DO etc are "sticky" - |
| 4225 | * they remain set for pipes inside if/while. |
| 4226 | * This is used to control execution. |
| 4227 | * RES_FOR and RES_IN are NOT sticky (needed to support |
| 4228 | * cases where variable or value happens to match a keyword): |
| 4229 | */ |
| 4230 | #if ENABLE_HUSH_LOOPS |
| 4231 | if (ctx->ctx_res_w == RES_FOR |
| 4232 | || ctx->ctx_res_w == RES_IN) |
| 4233 | ctx->ctx_res_w = RES_NONE; |
| 4234 | #endif |
| 4235 | #if ENABLE_HUSH_CASE |
| 4236 | if (ctx->ctx_res_w == RES_MATCH) |
| 4237 | ctx->ctx_res_w = RES_CASE_BODY; |
| 4238 | if (ctx->ctx_res_w == RES_CASE) |
| 4239 | ctx->ctx_res_w = RES_CASE_IN; |
| 4240 | #endif |
| 4241 | ctx->command = NULL; /* trick done_command below */ |
| 4242 | /* Create the memory for command, roughly: |
| 4243 | * ctx->pipe->cmds = new struct command; |
| 4244 | * ctx->command = &ctx->pipe->cmds[0]; |
| 4245 | */ |
| 4246 | done_command(ctx); |
| 4247 | //debug_print_tree(ctx->list_head, 10); |
| 4248 | } |
| 4249 | debug_printf_parse("done_pipe return\n"); |
| 4250 | } |
| 4251 | |
| 4252 | static void initialize_context(struct parse_context *ctx) |
| 4253 | { |
| 4254 | memset(ctx, 0, sizeof(*ctx)); |
| 4255 | if (MAYBE_ASSIGNMENT != 0) |
| 4256 | ctx->is_assignment = MAYBE_ASSIGNMENT; |
| 4257 | ctx->pipe = ctx->list_head = new_pipe(); |
| 4258 | /* Create the memory for command, roughly: |
| 4259 | * ctx->pipe->cmds = new struct command; |
| 4260 | * ctx->command = &ctx->pipe->cmds[0]; |
| 4261 | */ |
| 4262 | done_command(ctx); |
| 4263 | } |
| 4264 | |
| 4265 | /* If a reserved word is found and processed, parse context is modified |
| 4266 | * and 1 is returned. |
| 4267 | */ |
| 4268 | #if HAS_KEYWORDS |
| 4269 | struct reserved_combo { |
| 4270 | char literal[6]; |
| 4271 | unsigned char res; |
| 4272 | unsigned char assignment_flag; |
| 4273 | uint32_t flag; |
| 4274 | }; |
| 4275 | enum { |
| 4276 | FLAG_END = (1 << RES_NONE ), |
| 4277 | # if ENABLE_HUSH_IF |
| 4278 | FLAG_IF = (1 << RES_IF ), |
| 4279 | FLAG_THEN = (1 << RES_THEN ), |
| 4280 | FLAG_ELIF = (1 << RES_ELIF ), |
| 4281 | FLAG_ELSE = (1 << RES_ELSE ), |
| 4282 | FLAG_FI = (1 << RES_FI ), |
| 4283 | # endif |
| 4284 | # if ENABLE_HUSH_LOOPS |
| 4285 | FLAG_FOR = (1 << RES_FOR ), |
| 4286 | FLAG_WHILE = (1 << RES_WHILE), |
| 4287 | FLAG_UNTIL = (1 << RES_UNTIL), |
| 4288 | FLAG_DO = (1 << RES_DO ), |
| 4289 | FLAG_DONE = (1 << RES_DONE ), |
| 4290 | FLAG_IN = (1 << RES_IN ), |
| 4291 | # endif |
| 4292 | # if ENABLE_HUSH_CASE |
| 4293 | FLAG_MATCH = (1 << RES_MATCH), |
| 4294 | FLAG_ESAC = (1 << RES_ESAC ), |
| 4295 | # endif |
| 4296 | FLAG_START = (1 << RES_XXXX ), |
| 4297 | }; |
| 4298 | |
| 4299 | static const struct reserved_combo* match_reserved_word(o_string *word) |
| 4300 | { |
| 4301 | /* Mostly a list of accepted follow-up reserved words. |
| 4302 | * FLAG_END means we are done with the sequence, and are ready |
| 4303 | * to turn the compound list into a command. |
| 4304 | * FLAG_START means the word must start a new compound list. |
| 4305 | */ |
| 4306 | static const struct reserved_combo reserved_list[] ALIGN4 = { |
| 4307 | # if ENABLE_HUSH_IF |
| 4308 | { "!", RES_NONE, NOT_ASSIGNMENT , 0 }, |
| 4309 | { "if", RES_IF, MAYBE_ASSIGNMENT, FLAG_THEN | FLAG_START }, |
| 4310 | { "then", RES_THEN, MAYBE_ASSIGNMENT, FLAG_ELIF | FLAG_ELSE | FLAG_FI }, |
| 4311 | { "elif", RES_ELIF, MAYBE_ASSIGNMENT, FLAG_THEN }, |
| 4312 | { "else", RES_ELSE, MAYBE_ASSIGNMENT, FLAG_FI }, |
| 4313 | { "fi", RES_FI, NOT_ASSIGNMENT , FLAG_END }, |
| 4314 | # endif |
| 4315 | # if ENABLE_HUSH_LOOPS |
| 4316 | { "for", RES_FOR, NOT_ASSIGNMENT , FLAG_IN | FLAG_DO | FLAG_START }, |
| 4317 | { "while", RES_WHILE, MAYBE_ASSIGNMENT, FLAG_DO | FLAG_START }, |
| 4318 | { "until", RES_UNTIL, MAYBE_ASSIGNMENT, FLAG_DO | FLAG_START }, |
| 4319 | { "in", RES_IN, NOT_ASSIGNMENT , FLAG_DO }, |
| 4320 | { "do", RES_DO, MAYBE_ASSIGNMENT, FLAG_DONE }, |
| 4321 | { "done", RES_DONE, NOT_ASSIGNMENT , FLAG_END }, |
| 4322 | # endif |
| 4323 | # if ENABLE_HUSH_CASE |
| 4324 | { "case", RES_CASE, NOT_ASSIGNMENT , FLAG_MATCH | FLAG_START }, |
| 4325 | { "esac", RES_ESAC, NOT_ASSIGNMENT , FLAG_END }, |
| 4326 | # endif |
| 4327 | }; |
| 4328 | const struct reserved_combo *r; |
| 4329 | |
| 4330 | for (r = reserved_list; r < reserved_list + ARRAY_SIZE(reserved_list); r++) { |
| 4331 | if (strcmp(word->data, r->literal) == 0) |
| 4332 | return r; |
| 4333 | } |
| 4334 | return NULL; |
| 4335 | } |
| 4336 | /* Return NULL: not a keyword, else: keyword |
| 4337 | */ |
| 4338 | static const struct reserved_combo* reserved_word(struct parse_context *ctx) |
| 4339 | { |
| 4340 | # if ENABLE_HUSH_CASE |
| 4341 | static const struct reserved_combo reserved_match = { |
| 4342 | "", RES_MATCH, NOT_ASSIGNMENT , FLAG_MATCH | FLAG_ESAC |
| 4343 | }; |
| 4344 | # endif |
| 4345 | const struct reserved_combo *r; |
| 4346 | |
| 4347 | if (ctx->word.has_quoted_part) |
| 4348 | return 0; |
| 4349 | r = match_reserved_word(&ctx->word); |
| 4350 | if (!r) |
| 4351 | return r; /* NULL */ |
| 4352 | |
| 4353 | debug_printf("found reserved word %s, res %d\n", r->literal, r->res); |
| 4354 | # if ENABLE_HUSH_CASE |
| 4355 | if (r->res == RES_IN && ctx->ctx_res_w == RES_CASE_IN) { |
| 4356 | /* "case word IN ..." - IN part starts first MATCH part */ |
| 4357 | r = &reserved_match; |
| 4358 | } else |
| 4359 | # endif |
| 4360 | if (r->flag == 0) { /* '!' */ |
| 4361 | if (ctx->ctx_inverted) { /* bash doesn't accept '! ! true' */ |
| 4362 | syntax_error("! ! command"); |
| 4363 | ctx->ctx_res_w = RES_SNTX; |
| 4364 | } |
| 4365 | ctx->ctx_inverted = 1; |
| 4366 | return r; |
| 4367 | } |
| 4368 | if (r->flag & FLAG_START) { |
| 4369 | struct parse_context *old; |
| 4370 | |
| 4371 | old = xmemdup(ctx, sizeof(*ctx)); |
| 4372 | debug_printf_parse("push stack %p\n", old); |
| 4373 | initialize_context(ctx); |
| 4374 | ctx->stack = old; |
| 4375 | } else if (/*ctx->ctx_res_w == RES_NONE ||*/ !(ctx->old_flag & (1 << r->res))) { |
| 4376 | syntax_error_at(ctx->word.data); |
| 4377 | ctx->ctx_res_w = RES_SNTX; |
| 4378 | return r; |
| 4379 | } else { |
| 4380 | /* "{...} fi" is ok. "{...} if" is not |
| 4381 | * Example: |
| 4382 | * if { echo foo; } then { echo bar; } fi */ |
| 4383 | if (ctx->command->group) |
| 4384 | done_pipe(ctx, PIPE_SEQ); |
| 4385 | } |
| 4386 | |
| 4387 | ctx->ctx_res_w = r->res; |
| 4388 | ctx->old_flag = r->flag; |
| 4389 | ctx->is_assignment = r->assignment_flag; |
| 4390 | debug_printf_parse("ctx->is_assignment='%s'\n", assignment_flag[ctx->is_assignment]); |
| 4391 | |
| 4392 | if (ctx->old_flag & FLAG_END) { |
| 4393 | struct parse_context *old; |
| 4394 | |
| 4395 | done_pipe(ctx, PIPE_SEQ); |
| 4396 | debug_printf_parse("pop stack %p\n", ctx->stack); |
| 4397 | old = ctx->stack; |
| 4398 | old->command->group = ctx->list_head; |
| 4399 | old->command->cmd_type = CMD_NORMAL; |
| 4400 | # if !BB_MMU |
| 4401 | /* At this point, the compound command's string is in |
| 4402 | * ctx->as_string... except for the leading keyword! |
| 4403 | * Consider this example: "echo a | if true; then echo a; fi" |
| 4404 | * ctx->as_string will contain "true; then echo a; fi", |
| 4405 | * with "if " remaining in old->as_string! |
| 4406 | */ |
| 4407 | { |
| 4408 | char *str; |
| 4409 | int len = old->as_string.length; |
| 4410 | /* Concatenate halves */ |
| 4411 | o_addstr(&old->as_string, ctx->as_string.data); |
| 4412 | o_free(&ctx->as_string); |
| 4413 | /* Find where leading keyword starts in first half */ |
| 4414 | str = old->as_string.data + len; |
| 4415 | if (str > old->as_string.data) |
| 4416 | str--; /* skip whitespace after keyword */ |
| 4417 | while (str > old->as_string.data && isalpha(str[-1])) |
| 4418 | str--; |
| 4419 | /* Ugh, we're done with this horrid hack */ |
| 4420 | old->command->group_as_string = xstrdup(str); |
| 4421 | debug_printf_parse("pop, remembering as:'%s'\n", |
| 4422 | old->command->group_as_string); |
| 4423 | } |
| 4424 | # endif |
| 4425 | *ctx = *old; /* physical copy */ |
| 4426 | free(old); |
| 4427 | } |
| 4428 | return r; |
| 4429 | } |
| 4430 | #endif /* HAS_KEYWORDS */ |
| 4431 | |
| 4432 | /* Word is complete, look at it and update parsing context. |
| 4433 | * Normal return is 0. Syntax errors return 1. |
| 4434 | * Note: on return, word is reset, but not o_free'd! |
| 4435 | */ |
| 4436 | static int done_word(struct parse_context *ctx) |
| 4437 | { |
| 4438 | struct command *command = ctx->command; |
| 4439 | |
| 4440 | debug_printf_parse("done_word entered: '%s' %p\n", ctx->word.data, command); |
| 4441 | if (ctx->word.length == 0 && !ctx->word.has_quoted_part) { |
| 4442 | debug_printf_parse("done_word return 0: true null, ignored\n"); |
| 4443 | return 0; |
| 4444 | } |
| 4445 | |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 4446 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 4447 | if (ctx->pending_redirect) { |
| 4448 | /* We do not glob in e.g. >*.tmp case. bash seems to glob here |
| 4449 | * only if run as "bash", not "sh" */ |
| 4450 | /* http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html |
| 4451 | * "2.7 Redirection |
| 4452 | * If the redirection operator is "<<" or "<<-", the word |
| 4453 | * that follows the redirection operator shall be |
| 4454 | * subjected to quote removal; it is unspecified whether |
| 4455 | * any of the other expansions occur. For the other |
| 4456 | * redirection operators, the word that follows the |
| 4457 | * redirection operator shall be subjected to tilde |
| 4458 | * expansion, parameter expansion, command substitution, |
| 4459 | * arithmetic expansion, and quote removal. |
| 4460 | * Pathname expansion shall not be performed |
| 4461 | * on the word by a non-interactive shell; an interactive |
| 4462 | * shell may perform it, but shall do so only when |
| 4463 | * the expansion would result in one word." |
| 4464 | */ |
| 4465 | //bash does not do parameter/command substitution or arithmetic expansion |
| 4466 | //for _heredoc_ redirection word: these constructs look for exact eof marker |
| 4467 | // as written: |
| 4468 | // <<EOF$t |
| 4469 | // <<EOF$((1)) |
| 4470 | // <<EOF`true` [this case also makes heredoc "quoted", a-la <<"EOF". Probably bash-4.3.43 bug] |
| 4471 | |
| 4472 | ctx->pending_redirect->rd_filename = xstrdup(ctx->word.data); |
| 4473 | /* Cater for >\file case: |
| 4474 | * >\a creates file a; >\\a, >"\a", >"\\a" create file \a |
| 4475 | * Same with heredocs: |
| 4476 | * for <<\H delim is H; <<\\H, <<"\H", <<"\\H" - \H |
| 4477 | */ |
| 4478 | if (ctx->pending_redirect->rd_type == REDIRECT_HEREDOC) { |
| 4479 | unbackslash(ctx->pending_redirect->rd_filename); |
| 4480 | /* Is it <<"HEREDOC"? */ |
| 4481 | if (ctx->word.has_quoted_part) { |
| 4482 | ctx->pending_redirect->rd_dup |= HEREDOC_QUOTED; |
| 4483 | } |
| 4484 | } |
| 4485 | debug_printf_parse("word stored in rd_filename: '%s'\n", ctx->word.data); |
| 4486 | ctx->pending_redirect = NULL; |
| 4487 | } else { |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 4488 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 4489 | #if HAS_KEYWORDS |
| 4490 | # if ENABLE_HUSH_CASE |
| 4491 | if (ctx->ctx_dsemicolon |
| 4492 | && strcmp(ctx->word.data, "esac") != 0 /* not "... pattern) cmd;; esac" */ |
| 4493 | ) { |
| 4494 | /* already done when ctx_dsemicolon was set to 1: */ |
| 4495 | /* ctx->ctx_res_w = RES_MATCH; */ |
| 4496 | ctx->ctx_dsemicolon = 0; |
| 4497 | } else |
| 4498 | # endif |
| 4499 | # if defined(CMD_TEST2_SINGLEWORD_NOGLOB) |
| 4500 | if (command->cmd_type == CMD_TEST2_SINGLEWORD_NOGLOB |
| 4501 | && strcmp(ctx->word.data, "]]") == 0 |
| 4502 | ) { |
| 4503 | /* allow "[[ ]] >file" etc */ |
| 4504 | command->cmd_type = CMD_SINGLEWORD_NOGLOB; |
| 4505 | } else |
| 4506 | # endif |
| 4507 | if (!command->argv /* if it's the first word... */ |
| 4508 | # if ENABLE_HUSH_LOOPS |
| 4509 | && ctx->ctx_res_w != RES_FOR /* ...not after FOR or IN */ |
| 4510 | && ctx->ctx_res_w != RES_IN |
| 4511 | # endif |
| 4512 | # if ENABLE_HUSH_CASE |
| 4513 | && ctx->ctx_res_w != RES_CASE |
| 4514 | # endif |
| 4515 | ) { |
| 4516 | const struct reserved_combo *reserved; |
| 4517 | reserved = reserved_word(ctx); |
| 4518 | debug_printf_parse("checking for reserved-ness: %d\n", !!reserved); |
| 4519 | if (reserved) { |
| 4520 | # if ENABLE_HUSH_LINENO_VAR |
| 4521 | /* Case: |
| 4522 | * "while ...; do |
| 4523 | * cmd ..." |
| 4524 | * If we don't close the pipe _now_, immediately after "do", lineno logic |
| 4525 | * sees "cmd" as starting at "do" - i.e., at the previous line. |
| 4526 | */ |
| 4527 | if (0 |
| 4528 | IF_HUSH_IF(|| reserved->res == RES_THEN) |
| 4529 | IF_HUSH_IF(|| reserved->res == RES_ELIF) |
| 4530 | IF_HUSH_IF(|| reserved->res == RES_ELSE) |
| 4531 | IF_HUSH_LOOPS(|| reserved->res == RES_DO) |
| 4532 | ) { |
| 4533 | done_pipe(ctx, PIPE_SEQ); |
| 4534 | } |
| 4535 | # endif |
| 4536 | o_reset_to_empty_unquoted(&ctx->word); |
| 4537 | debug_printf_parse("done_word return %d\n", |
| 4538 | (ctx->ctx_res_w == RES_SNTX)); |
| 4539 | return (ctx->ctx_res_w == RES_SNTX); |
| 4540 | } |
| 4541 | # if defined(CMD_TEST2_SINGLEWORD_NOGLOB) |
| 4542 | if (strcmp(ctx->word.data, "[[") == 0) { |
| 4543 | command->cmd_type = CMD_TEST2_SINGLEWORD_NOGLOB; |
| 4544 | } else |
| 4545 | # endif |
| 4546 | # if defined(CMD_SINGLEWORD_NOGLOB) |
| 4547 | if (0 |
| 4548 | /* In bash, local/export/readonly are special, args |
| 4549 | * are assignments and therefore expansion of them |
| 4550 | * should be "one-word" expansion: |
| 4551 | * $ export i=`echo 'a b'` # one arg: "i=a b" |
| 4552 | * compare with: |
| 4553 | * $ ls i=`echo 'a b'` # two args: "i=a" and "b" |
| 4554 | * ls: cannot access i=a: No such file or directory |
| 4555 | * ls: cannot access b: No such file or directory |
| 4556 | * Note: bash 3.2.33(1) does this only if export word |
| 4557 | * itself is not quoted: |
| 4558 | * $ export i=`echo 'aaa bbb'`; echo "$i" |
| 4559 | * aaa bbb |
| 4560 | * $ "export" i=`echo 'aaa bbb'`; echo "$i" |
| 4561 | * aaa |
| 4562 | */ |
| 4563 | IF_HUSH_LOCAL( || strcmp(ctx->word.data, "local") == 0) |
| 4564 | IF_HUSH_EXPORT( || strcmp(ctx->word.data, "export") == 0) |
| 4565 | IF_HUSH_READONLY(|| strcmp(ctx->word.data, "readonly") == 0) |
| 4566 | ) { |
| 4567 | command->cmd_type = CMD_SINGLEWORD_NOGLOB; |
| 4568 | } |
| 4569 | # else |
| 4570 | { /* empty block to pair "if ... else" */ } |
| 4571 | # endif |
| 4572 | } |
| 4573 | #endif /* HAS_KEYWORDS */ |
| 4574 | |
| 4575 | if (command->group) { |
| 4576 | /* "{ echo foo; } echo bar" - bad */ |
| 4577 | syntax_error_at(ctx->word.data); |
| 4578 | debug_printf_parse("done_word return 1: syntax error, " |
| 4579 | "groups and arglists don't mix\n"); |
| 4580 | return 1; |
| 4581 | } |
| 4582 | |
| 4583 | /* If this word wasn't an assignment, next ones definitely |
| 4584 | * can't be assignments. Even if they look like ones. */ |
| 4585 | if (ctx->is_assignment != DEFINITELY_ASSIGNMENT |
| 4586 | && ctx->is_assignment != WORD_IS_KEYWORD |
| 4587 | ) { |
| 4588 | ctx->is_assignment = NOT_ASSIGNMENT; |
| 4589 | } else { |
| 4590 | if (ctx->is_assignment == DEFINITELY_ASSIGNMENT) { |
| 4591 | command->assignment_cnt++; |
| 4592 | debug_printf_parse("++assignment_cnt=%d\n", command->assignment_cnt); |
| 4593 | } |
| 4594 | debug_printf_parse("ctx->is_assignment was:'%s'\n", assignment_flag[ctx->is_assignment]); |
| 4595 | ctx->is_assignment = MAYBE_ASSIGNMENT; |
| 4596 | } |
| 4597 | debug_printf_parse("ctx->is_assignment='%s'\n", assignment_flag[ctx->is_assignment]); |
| 4598 | command->argv = add_string_to_strings(command->argv, xstrdup(ctx->word.data)); |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 4599 | #ifdef __U_BOOT__ |
| 4600 | command->argc++; |
| 4601 | #endif /* __U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 4602 | debug_print_strings("word appended to argv", command->argv); |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 4603 | |
| 4604 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 4605 | } |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 4606 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 4607 | |
| 4608 | #if ENABLE_HUSH_LOOPS |
| 4609 | if (ctx->ctx_res_w == RES_FOR) { |
| 4610 | if (ctx->word.has_quoted_part |
| 4611 | || endofname(command->argv[0])[0] != '\0' |
| 4612 | ) { |
| 4613 | /* bash says just "not a valid identifier" */ |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 4614 | syntax_error("bad for loop variable"); |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 4615 | return 1; |
| 4616 | } |
| 4617 | /* Force FOR to have just one word (variable name) */ |
| 4618 | /* NB: basically, this makes hush see "for v in ..." |
| 4619 | * syntax as if it is "for v; in ...". FOR and IN become |
| 4620 | * two pipe structs in parse tree. */ |
| 4621 | done_pipe(ctx, PIPE_SEQ); |
| 4622 | } |
| 4623 | #endif |
| 4624 | #if ENABLE_HUSH_CASE |
| 4625 | /* Force CASE to have just one word */ |
| 4626 | if (ctx->ctx_res_w == RES_CASE) { |
| 4627 | done_pipe(ctx, PIPE_SEQ); |
| 4628 | } |
| 4629 | #endif |
| 4630 | |
| 4631 | o_reset_to_empty_unquoted(&ctx->word); |
| 4632 | |
| 4633 | debug_printf_parse("done_word return 0\n"); |
| 4634 | return 0; |
| 4635 | } |
| 4636 | |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 4637 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 4638 | /* Peek ahead in the input to find out if we have a "&n" construct, |
| 4639 | * as in "2>&1", that represents duplicating a file descriptor. |
| 4640 | * Return: |
| 4641 | * REDIRFD_CLOSE if >&- "close fd" construct is seen, |
| 4642 | * REDIRFD_SYNTAX_ERR if syntax error, |
| 4643 | * REDIRFD_TO_FILE if no & was seen, |
| 4644 | * or the number found. |
| 4645 | */ |
| 4646 | #if BB_MMU |
| 4647 | #define parse_redir_right_fd(as_string, input) \ |
| 4648 | parse_redir_right_fd(input) |
| 4649 | #endif |
| 4650 | static int parse_redir_right_fd(o_string *as_string, struct in_str *input) |
| 4651 | { |
| 4652 | int ch, d, ok; |
| 4653 | |
| 4654 | ch = i_peek(input); |
| 4655 | if (ch != '&') |
| 4656 | return REDIRFD_TO_FILE; |
| 4657 | |
| 4658 | ch = i_getch(input); /* get the & */ |
| 4659 | nommu_addchr(as_string, ch); |
| 4660 | ch = i_peek(input); |
| 4661 | if (ch == '-') { |
| 4662 | ch = i_getch(input); |
| 4663 | nommu_addchr(as_string, ch); |
| 4664 | return REDIRFD_CLOSE; |
| 4665 | } |
| 4666 | d = 0; |
| 4667 | ok = 0; |
| 4668 | while (ch != EOF && isdigit(ch)) { |
| 4669 | d = d*10 + (ch-'0'); |
| 4670 | ok = 1; |
| 4671 | ch = i_getch(input); |
| 4672 | nommu_addchr(as_string, ch); |
| 4673 | ch = i_peek(input); |
| 4674 | } |
| 4675 | if (ok) return d; |
| 4676 | |
| 4677 | //TODO: this is the place to catch ">&file" bashism (redirect both fd 1 and 2) |
| 4678 | |
| 4679 | bb_simple_error_msg("ambiguous redirect"); |
| 4680 | return REDIRFD_SYNTAX_ERR; |
| 4681 | } |
| 4682 | |
| 4683 | /* Return code is 0 normal, 1 if a syntax error is detected |
| 4684 | */ |
| 4685 | static int parse_redirect(struct parse_context *ctx, |
| 4686 | int fd, |
| 4687 | redir_type style, |
| 4688 | struct in_str *input) |
| 4689 | { |
| 4690 | struct command *command = ctx->command; |
| 4691 | struct redir_struct *redir; |
| 4692 | struct redir_struct **redirp; |
| 4693 | int dup_num; |
| 4694 | |
| 4695 | dup_num = REDIRFD_TO_FILE; |
| 4696 | if (style != REDIRECT_HEREDOC) { |
| 4697 | /* Check for a '>&1' type redirect */ |
| 4698 | dup_num = parse_redir_right_fd(&ctx->as_string, input); |
| 4699 | if (dup_num == REDIRFD_SYNTAX_ERR) |
| 4700 | return 1; |
| 4701 | } else { |
| 4702 | int ch = i_peek_and_eat_bkslash_nl(input); |
| 4703 | dup_num = (ch == '-'); /* HEREDOC_SKIPTABS bit is 1 */ |
| 4704 | if (dup_num) { /* <<-... */ |
| 4705 | ch = i_getch(input); |
| 4706 | nommu_addchr(&ctx->as_string, ch); |
| 4707 | ch = i_peek(input); |
| 4708 | } |
| 4709 | } |
| 4710 | |
| 4711 | if (style == REDIRECT_OVERWRITE && dup_num == REDIRFD_TO_FILE) { |
| 4712 | int ch = i_peek_and_eat_bkslash_nl(input); |
| 4713 | if (ch == '|') { |
| 4714 | /* >|FILE redirect ("clobbering" >). |
| 4715 | * Since we do not support "set -o noclobber" yet, |
| 4716 | * >| and > are the same for now. Just eat |. |
| 4717 | */ |
| 4718 | ch = i_getch(input); |
| 4719 | nommu_addchr(&ctx->as_string, ch); |
| 4720 | } |
| 4721 | } |
| 4722 | |
| 4723 | /* Create a new redir_struct and append it to the linked list */ |
| 4724 | redirp = &command->redirects; |
| 4725 | while ((redir = *redirp) != NULL) { |
| 4726 | redirp = &(redir->next); |
| 4727 | } |
| 4728 | *redirp = redir = xzalloc(sizeof(*redir)); |
| 4729 | /* redir->next = NULL; */ |
| 4730 | /* redir->rd_filename = NULL; */ |
| 4731 | redir->rd_type = style; |
| 4732 | redir->rd_fd = (fd == -1) ? redir_table[style].default_fd : fd; |
| 4733 | |
| 4734 | debug_printf_parse("redirect type %d %s\n", redir->rd_fd, |
| 4735 | redir_table[style].descrip); |
| 4736 | |
| 4737 | redir->rd_dup = dup_num; |
| 4738 | if (style != REDIRECT_HEREDOC && dup_num != REDIRFD_TO_FILE) { |
| 4739 | /* Erik had a check here that the file descriptor in question |
| 4740 | * is legit; I postpone that to "run time" |
| 4741 | * A "-" representation of "close me" shows up as a -3 here */ |
| 4742 | debug_printf_parse("duplicating redirect '%d>&%d'\n", |
| 4743 | redir->rd_fd, redir->rd_dup); |
| 4744 | } else { |
| 4745 | #if 0 /* Instead we emit error message at run time */ |
| 4746 | if (ctx->pending_redirect) { |
| 4747 | /* For example, "cmd > <file" */ |
| 4748 | syntax_error("invalid redirect"); |
| 4749 | } |
| 4750 | #endif |
| 4751 | /* Set ctx->pending_redirect, so we know what to do at the |
| 4752 | * end of the next parsed word. */ |
| 4753 | ctx->pending_redirect = redir; |
| 4754 | } |
| 4755 | return 0; |
| 4756 | } |
| 4757 | |
| 4758 | /* If a redirect is immediately preceded by a number, that number is |
| 4759 | * supposed to tell which file descriptor to redirect. This routine |
| 4760 | * looks for such preceding numbers. In an ideal world this routine |
| 4761 | * needs to handle all the following classes of redirects... |
| 4762 | * echo 2>foo # redirects fd 2 to file "foo", nothing passed to echo |
| 4763 | * echo 49>foo # redirects fd 49 to file "foo", nothing passed to echo |
| 4764 | * echo -2>foo # redirects fd 1 to file "foo", "-2" passed to echo |
| 4765 | * echo 49x>foo # redirects fd 1 to file "foo", "49x" passed to echo |
| 4766 | * |
| 4767 | * http://www.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html |
| 4768 | * "2.7 Redirection |
| 4769 | * ... If n is quoted, the number shall not be recognized as part of |
| 4770 | * the redirection expression. For example: |
| 4771 | * echo \2>a |
| 4772 | * writes the character 2 into file a" |
| 4773 | * We are getting it right by setting ->has_quoted_part on any \<char> |
| 4774 | * |
| 4775 | * A -1 return means no valid number was found, |
| 4776 | * the caller should use the appropriate default for this redirection. |
| 4777 | */ |
| 4778 | static int redirect_opt_num(o_string *o) |
| 4779 | { |
| 4780 | int num; |
| 4781 | |
| 4782 | if (o->data == NULL) |
| 4783 | return -1; |
| 4784 | num = bb_strtou(o->data, NULL, 10); |
| 4785 | if (errno || num < 0) |
| 4786 | return -1; |
| 4787 | o_reset_to_empty_unquoted(o); |
| 4788 | return num; |
| 4789 | } |
| 4790 | |
| 4791 | #if BB_MMU |
| 4792 | #define fetch_till_str(as_string, input, word, skip_tabs) \ |
| 4793 | fetch_till_str(input, word, skip_tabs) |
| 4794 | #endif |
| 4795 | static char *fetch_till_str(o_string *as_string, |
| 4796 | struct in_str *input, |
| 4797 | const char *word, |
| 4798 | int heredoc_flags) |
| 4799 | { |
| 4800 | o_string heredoc = NULL_O_STRING; |
| 4801 | unsigned past_EOL; |
| 4802 | int prev = 0; /* not \ */ |
| 4803 | int ch; |
| 4804 | |
| 4805 | /* Starting with "" is necessary for this case: |
| 4806 | * cat <<EOF |
| 4807 | * |
| 4808 | * xxx |
| 4809 | * EOF |
| 4810 | */ |
| 4811 | heredoc.data = xzalloc(1); /* start as "", not as NULL */ |
| 4812 | |
| 4813 | goto jump_in; |
| 4814 | |
| 4815 | while (1) { |
| 4816 | ch = i_getch(input); |
| 4817 | if (ch != EOF) |
| 4818 | nommu_addchr(as_string, ch); |
| 4819 | if (ch == '\n' || ch == EOF) { |
| 4820 | check_heredoc_end: |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 4821 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 4822 | if ((heredoc_flags & HEREDOC_QUOTED) || prev != '\\') { |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 4823 | #else /* __U_BOOT__ */ |
| 4824 | if (prev != '\\') { |
| 4825 | #endif |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 4826 | /* End-of-line, and not a line continuation */ |
| 4827 | if (strcmp(heredoc.data + past_EOL, word) == 0) { |
| 4828 | heredoc.data[past_EOL] = '\0'; |
| 4829 | debug_printf_heredoc("parsed '%s' heredoc '%s'\n", word, heredoc.data); |
| 4830 | return heredoc.data; |
| 4831 | } |
| 4832 | if (ch == '\n') { |
| 4833 | /* This is a new line. |
| 4834 | * Remember position and backslash-escaping status. |
| 4835 | */ |
| 4836 | o_addchr(&heredoc, ch); |
| 4837 | prev = ch; |
| 4838 | jump_in: |
| 4839 | past_EOL = heredoc.length; |
| 4840 | /* Get 1st char of next line, possibly skipping leading tabs */ |
| 4841 | do { |
| 4842 | ch = i_getch(input); |
| 4843 | if (ch != EOF) |
| 4844 | nommu_addchr(as_string, ch); |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 4845 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 4846 | } while ((heredoc_flags & HEREDOC_SKIPTABS) && ch == '\t'); |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 4847 | #else /* __U_BOOT__ */ |
| 4848 | } while (ch == '\t'); |
| 4849 | #endif |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 4850 | /* If this immediately ended the line, |
| 4851 | * go back to end-of-line checks. |
| 4852 | */ |
| 4853 | if (ch == '\n') |
| 4854 | goto check_heredoc_end; |
| 4855 | } |
| 4856 | } else { |
| 4857 | /* Backslash-line continuation in an unquoted |
| 4858 | * heredoc. This does not need special handling |
| 4859 | * for heredoc body (unquoted heredocs are |
| 4860 | * expanded on "execution" and that would take |
| 4861 | * care of this case too), but not the case |
| 4862 | * of line continuation *in terminator*: |
| 4863 | * cat <<EOF |
| 4864 | * Ok1 |
| 4865 | * EO\ |
| 4866 | * F |
| 4867 | */ |
| 4868 | heredoc.data[--heredoc.length] = '\0'; |
| 4869 | prev = 0; /* not '\' */ |
| 4870 | continue; |
| 4871 | } |
| 4872 | } |
| 4873 | if (ch == EOF) { |
| 4874 | o_free(&heredoc); |
| 4875 | return NULL; /* error */ |
| 4876 | } |
| 4877 | o_addchr(&heredoc, ch); |
| 4878 | nommu_addchr(as_string, ch); |
| 4879 | if (prev == '\\' && ch == '\\') |
| 4880 | /* Correctly handle foo\\<eol> (not a line cont.) */ |
| 4881 | prev = 0; /* not '\' */ |
| 4882 | else |
| 4883 | prev = ch; |
| 4884 | } |
| 4885 | } |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 4886 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 4887 | |
| 4888 | /* Look at entire parse tree for not-yet-loaded REDIRECT_HEREDOCs |
| 4889 | * and load them all. There should be exactly heredoc_cnt of them. |
| 4890 | */ |
| 4891 | #if BB_MMU |
| 4892 | #define fetch_heredocs(as_string, pi, heredoc_cnt, input) \ |
| 4893 | fetch_heredocs(pi, heredoc_cnt, input) |
| 4894 | #endif |
| 4895 | static int fetch_heredocs(o_string *as_string, struct pipe *pi, int heredoc_cnt, struct in_str *input) |
| 4896 | { |
| 4897 | while (pi && heredoc_cnt) { |
| 4898 | int i; |
| 4899 | struct command *cmd = pi->cmds; |
| 4900 | |
| 4901 | debug_printf_heredoc("fetch_heredocs: num_cmds:%d cmd argv0:'%s'\n", |
| 4902 | pi->num_cmds, |
| 4903 | cmd->argv ? cmd->argv[0] : "NONE" |
| 4904 | ); |
| 4905 | for (i = 0; i < pi->num_cmds; i++) { |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 4906 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 4907 | struct redir_struct *redir = cmd->redirects; |
| 4908 | |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 4909 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 4910 | debug_printf_heredoc("fetch_heredocs: %d cmd argv0:'%s'\n", |
| 4911 | i, cmd->argv ? cmd->argv[0] : "NONE"); |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 4912 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 4913 | while (redir) { |
| 4914 | if (redir->rd_type == REDIRECT_HEREDOC) { |
| 4915 | char *p; |
| 4916 | |
| 4917 | redir->rd_type = REDIRECT_HEREDOC2; |
| 4918 | /* redir->rd_dup is (ab)used to indicate <<- */ |
| 4919 | p = fetch_till_str(as_string, input, |
| 4920 | redir->rd_filename, redir->rd_dup); |
| 4921 | if (!p) { |
| 4922 | syntax_error("unexpected EOF in here document"); |
| 4923 | return -1; |
| 4924 | } |
| 4925 | free(redir->rd_filename); |
| 4926 | redir->rd_filename = p; |
| 4927 | heredoc_cnt--; |
| 4928 | } |
| 4929 | redir = redir->next; |
| 4930 | } |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 4931 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 4932 | if (cmd->group) { |
| 4933 | //bb_error_msg("%s:%u heredoc_cnt:%d", __func__, __LINE__, heredoc_cnt); |
| 4934 | heredoc_cnt = fetch_heredocs(as_string, cmd->group, heredoc_cnt, input); |
| 4935 | //bb_error_msg("%s:%u heredoc_cnt:%d", __func__, __LINE__, heredoc_cnt); |
| 4936 | if (heredoc_cnt < 0) |
| 4937 | return heredoc_cnt; /* error */ |
| 4938 | } |
| 4939 | cmd++; |
| 4940 | } |
| 4941 | pi = pi->next; |
| 4942 | } |
| 4943 | return heredoc_cnt; |
| 4944 | } |
| 4945 | |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 4946 | static int run_list(struct pipe *pi); |
| 4947 | #if BB_MMU |
| 4948 | #define parse_stream(pstring, heredoc_cnt_ptr, input, end_trigger) \ |
| 4949 | parse_stream(heredoc_cnt_ptr, input, end_trigger) |
| 4950 | #endif |
| 4951 | static struct pipe *parse_stream(char **pstring, |
| 4952 | int *heredoc_cnt_ptr, |
| 4953 | struct in_str *input, |
| 4954 | int end_trigger); |
| 4955 | |
| 4956 | /* Returns number of heredocs not yet consumed, |
| 4957 | * or -1 on error. |
| 4958 | */ |
| 4959 | static int parse_group(struct parse_context *ctx, |
| 4960 | struct in_str *input, int ch) |
| 4961 | { |
| 4962 | /* ctx->word contains characters seen prior to ( or {. |
| 4963 | * Typically it's empty, but for function defs, |
| 4964 | * it contains function name (without '()'). */ |
| 4965 | #if BB_MMU |
| 4966 | # define as_string NULL |
| 4967 | #else |
| 4968 | char *as_string = NULL; |
| 4969 | #endif |
| 4970 | struct pipe *pipe_list; |
| 4971 | int heredoc_cnt = 0; |
| 4972 | int endch; |
| 4973 | struct command *command = ctx->command; |
| 4974 | |
| 4975 | debug_printf_parse("parse_group entered\n"); |
| 4976 | #if ENABLE_HUSH_FUNCTIONS |
| 4977 | if (ch == '(' && !ctx->word.has_quoted_part) { |
| 4978 | if (ctx->word.length) |
| 4979 | if (done_word(ctx)) |
| 4980 | return -1; |
| 4981 | if (!command->argv) |
| 4982 | goto skip; /* (... */ |
| 4983 | if (command->argv[1]) { /* word word ... (... */ |
| 4984 | syntax_error_unexpected_ch('('); |
| 4985 | return -1; |
| 4986 | } |
| 4987 | /* it is "word(..." or "word (..." */ |
| 4988 | do |
| 4989 | ch = i_getch(input); |
| 4990 | while (ch == ' ' || ch == '\t'); |
| 4991 | if (ch != ')') { |
| 4992 | syntax_error_unexpected_ch(ch); |
| 4993 | return -1; |
| 4994 | } |
| 4995 | nommu_addchr(&ctx->as_string, ch); |
| 4996 | do |
| 4997 | ch = i_getch(input); |
| 4998 | while (ch == ' ' || ch == '\t' || ch == '\n'); |
| 4999 | if (ch != '{' && ch != '(') { |
| 5000 | syntax_error_unexpected_ch(ch); |
| 5001 | return -1; |
| 5002 | } |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 5003 | //bash allows functions named "123", "..", "return"! |
| 5004 | // if (endofname(command->argv[0])[0] != '\0') { |
| 5005 | // syntax_error("bad function name"); |
| 5006 | // return -1; |
| 5007 | // } |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 5008 | nommu_addchr(&ctx->as_string, ch); |
| 5009 | command->cmd_type = CMD_FUNCDEF; |
| 5010 | goto skip; |
| 5011 | } |
| 5012 | #endif |
| 5013 | |
| 5014 | #if 0 /* Prevented by caller */ |
| 5015 | if (command->argv /* word [word]{... */ |
| 5016 | || ctx->word.length /* word{... */ |
| 5017 | || ctx->word.has_quoted_part /* ""{... */ |
| 5018 | ) { |
| 5019 | syntax_error(NULL); |
| 5020 | debug_printf_parse("parse_group return -1: " |
| 5021 | "syntax error, groups and arglists don't mix\n"); |
| 5022 | return -1; |
| 5023 | } |
| 5024 | #endif |
| 5025 | |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 5026 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 5027 | IF_HUSH_FUNCTIONS(skip:) |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 5028 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 5029 | |
| 5030 | endch = '}'; |
| 5031 | if (ch == '(') { |
| 5032 | endch = ')'; |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 5033 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 5034 | IF_HUSH_FUNCTIONS(if (command->cmd_type != CMD_FUNCDEF)) |
| 5035 | command->cmd_type = CMD_SUBSHELL; |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 5036 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 5037 | } else { |
| 5038 | /* bash does not allow "{echo...", requires whitespace */ |
| 5039 | ch = i_peek(input); |
| 5040 | if (ch != ' ' && ch != '\t' && ch != '\n' |
| 5041 | && ch != '(' /* but "{(..." is allowed (without whitespace) */ |
| 5042 | ) { |
| 5043 | syntax_error_unexpected_ch(ch); |
| 5044 | return -1; |
| 5045 | } |
| 5046 | if (ch != '(') { |
| 5047 | ch = i_getch(input); |
| 5048 | nommu_addchr(&ctx->as_string, ch); |
| 5049 | } |
| 5050 | } |
| 5051 | |
| 5052 | debug_printf_heredoc("calling parse_stream, heredoc_cnt:%d\n", heredoc_cnt); |
| 5053 | pipe_list = parse_stream(&as_string, &heredoc_cnt, input, endch); |
| 5054 | debug_printf_heredoc("parse_stream returned: heredoc_cnt:%d\n", heredoc_cnt); |
| 5055 | #if !BB_MMU |
| 5056 | if (as_string) |
| 5057 | o_addstr(&ctx->as_string, as_string); |
| 5058 | #endif |
| 5059 | |
| 5060 | /* empty ()/{} or parse error? */ |
| 5061 | if (!pipe_list || pipe_list == ERR_PTR) { |
| 5062 | /* parse_stream already emitted error msg */ |
| 5063 | if (!BB_MMU) |
| 5064 | free(as_string); |
| 5065 | debug_printf_parse("parse_group return -1: " |
| 5066 | "parse_stream returned %p\n", pipe_list); |
| 5067 | return -1; |
| 5068 | } |
| 5069 | #if !BB_MMU |
| 5070 | as_string[strlen(as_string) - 1] = '\0'; /* plink ')' or '}' */ |
| 5071 | command->group_as_string = as_string; |
| 5072 | debug_printf_parse("end of group, remembering as:'%s'\n", |
| 5073 | command->group_as_string); |
| 5074 | #endif |
| 5075 | |
| 5076 | #if ENABLE_HUSH_FUNCTIONS |
| 5077 | /* Convert "f() (cmds)" to "f() {(cmds)}" */ |
| 5078 | if (command->cmd_type == CMD_FUNCDEF && endch == ')') { |
| 5079 | struct command *cmd2; |
| 5080 | |
| 5081 | cmd2 = xzalloc(sizeof(*cmd2)); |
| 5082 | cmd2->cmd_type = CMD_SUBSHELL; |
| 5083 | cmd2->group = pipe_list; |
| 5084 | # if !BB_MMU |
| 5085 | //UNTESTED! |
| 5086 | cmd2->group_as_string = command->group_as_string; |
| 5087 | command->group_as_string = xasprintf("(%s)", command->group_as_string); |
| 5088 | # endif |
| 5089 | |
| 5090 | pipe_list = new_pipe(); |
| 5091 | pipe_list->cmds = cmd2; |
| 5092 | pipe_list->num_cmds = 1; |
| 5093 | } |
| 5094 | #endif |
| 5095 | |
| 5096 | command->group = pipe_list; |
| 5097 | |
| 5098 | debug_printf_parse("parse_group return %d\n", heredoc_cnt); |
| 5099 | return heredoc_cnt; |
| 5100 | /* command remains "open", available for possible redirects */ |
| 5101 | #undef as_string |
| 5102 | } |
| 5103 | |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 5104 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 5105 | #if ENABLE_HUSH_TICK || ENABLE_FEATURE_SH_MATH || ENABLE_HUSH_DOLLAR_OPS |
| 5106 | /* Subroutines for copying $(...) and `...` things */ |
| 5107 | /* '...' */ |
| 5108 | static int add_till_single_quote(o_string *dest, struct in_str *input) |
| 5109 | { |
| 5110 | while (1) { |
| 5111 | int ch = i_getch(input); |
| 5112 | if (ch == EOF) { |
| 5113 | syntax_error_unterm_ch('\''); |
| 5114 | return 0; |
| 5115 | } |
| 5116 | if (ch == '\'') |
| 5117 | return 1; |
| 5118 | o_addchr(dest, ch); |
| 5119 | } |
| 5120 | } |
| 5121 | static int add_till_single_quote_dquoted(o_string *dest, struct in_str *input) |
| 5122 | { |
| 5123 | while (1) { |
| 5124 | int ch = i_getch(input); |
| 5125 | if (ch == EOF) { |
| 5126 | syntax_error_unterm_ch('\''); |
| 5127 | return 0; |
| 5128 | } |
| 5129 | if (ch == '\'') |
| 5130 | return 1; |
| 5131 | o_addqchr(dest, ch); |
| 5132 | } |
| 5133 | } |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 5134 | |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 5135 | /* "...\"...`..`...." - do we need to handle "...$(..)..." too? */ |
| 5136 | static int add_till_backquote(o_string *dest, struct in_str *input, int in_dquote); |
| 5137 | static int add_till_double_quote(o_string *dest, struct in_str *input) |
| 5138 | { |
| 5139 | while (1) { |
| 5140 | int ch = i_getch(input); |
| 5141 | if (ch == EOF) { |
| 5142 | syntax_error_unterm_ch('"'); |
| 5143 | return 0; |
| 5144 | } |
| 5145 | if (ch == '"') |
| 5146 | return 1; |
| 5147 | if (ch == '\\') { /* \x. Copy both chars. */ |
| 5148 | o_addchr(dest, ch); |
| 5149 | ch = i_getch(input); |
| 5150 | } |
| 5151 | o_addchr(dest, ch); |
| 5152 | if (ch == '`') { |
| 5153 | if (!add_till_backquote(dest, input, /*in_dquote:*/ 1)) |
| 5154 | return 0; |
| 5155 | o_addchr(dest, ch); |
| 5156 | continue; |
| 5157 | } |
| 5158 | //if (ch == '$') ... |
| 5159 | } |
| 5160 | } |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 5161 | |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 5162 | /* Process `cmd` - copy contents until "`" is seen. Complicated by |
| 5163 | * \` quoting. |
| 5164 | * "Within the backquoted style of command substitution, backslash |
| 5165 | * shall retain its literal meaning, except when followed by: '$', '`', or '\'. |
| 5166 | * The search for the matching backquote shall be satisfied by the first |
| 5167 | * backquote found without a preceding backslash; during this search, |
| 5168 | * if a non-escaped backquote is encountered within a shell comment, |
| 5169 | * a here-document, an embedded command substitution of the $(command) |
| 5170 | * form, or a quoted string, undefined results occur. A single-quoted |
| 5171 | * or double-quoted string that begins, but does not end, within the |
| 5172 | * "`...`" sequence produces undefined results." |
| 5173 | * Example Output |
| 5174 | * echo `echo '\'TEST\`echo ZZ\`BEST` \TESTZZBEST |
| 5175 | */ |
| 5176 | static int add_till_backquote(o_string *dest, struct in_str *input, int in_dquote) |
| 5177 | { |
| 5178 | while (1) { |
| 5179 | int ch = i_getch(input); |
| 5180 | if (ch == '`') |
| 5181 | return 1; |
| 5182 | if (ch == '\\') { |
| 5183 | /* \x. Copy both unless it is \`, \$, \\ and maybe \" */ |
| 5184 | ch = i_getch(input); |
| 5185 | if (ch != '`' |
| 5186 | && ch != '$' |
| 5187 | && ch != '\\' |
| 5188 | && (!in_dquote || ch != '"') |
| 5189 | ) { |
| 5190 | o_addchr(dest, '\\'); |
| 5191 | } |
| 5192 | } |
| 5193 | if (ch == EOF) { |
| 5194 | syntax_error_unterm_ch('`'); |
| 5195 | return 0; |
| 5196 | } |
| 5197 | o_addchr(dest, ch); |
| 5198 | } |
| 5199 | } |
| 5200 | /* Process $(cmd) - copy contents until ")" is seen. Complicated by |
| 5201 | * quoting and nested ()s. |
| 5202 | * "With the $(command) style of command substitution, all characters |
| 5203 | * following the open parenthesis to the matching closing parenthesis |
| 5204 | * constitute the command. Any valid shell script can be used for command, |
| 5205 | * except a script consisting solely of redirections which produces |
| 5206 | * unspecified results." |
| 5207 | * Example Output |
| 5208 | * echo $(echo '(TEST)' BEST) (TEST) BEST |
| 5209 | * echo $(echo 'TEST)' BEST) TEST) BEST |
| 5210 | * echo $(echo \(\(TEST\) BEST) ((TEST) BEST |
| 5211 | * |
| 5212 | * Also adapted to eat ${var%...} and $((...)) constructs, since ... part |
| 5213 | * can contain arbitrary constructs, just like $(cmd). |
| 5214 | * In bash compat mode, it needs to also be able to stop on ':' or '/' |
| 5215 | * for ${var:N[:M]} and ${var/P[/R]} parsing. |
| 5216 | */ |
| 5217 | #define DOUBLE_CLOSE_CHAR_FLAG 0x80 |
| 5218 | static int add_till_closing_bracket(o_string *dest, struct in_str *input, unsigned end_ch) |
| 5219 | { |
| 5220 | int ch; |
| 5221 | char dbl = end_ch & DOUBLE_CLOSE_CHAR_FLAG; |
| 5222 | # if BASH_SUBSTR || BASH_PATTERN_SUBST |
| 5223 | char end_char2 = end_ch >> 8; |
| 5224 | # endif |
| 5225 | end_ch &= (DOUBLE_CLOSE_CHAR_FLAG - 1); |
| 5226 | |
| 5227 | # if ENABLE_HUSH_INTERACTIVE |
| 5228 | G.promptmode = 1; /* PS2 */ |
| 5229 | # endif |
| 5230 | debug_printf_prompt("%s promptmode=%d\n", __func__, G.promptmode); |
| 5231 | |
| 5232 | while (1) { |
| 5233 | ch = i_getch(input); |
| 5234 | if (ch == EOF) { |
| 5235 | syntax_error_unterm_ch(end_ch); |
| 5236 | return 0; |
| 5237 | } |
| 5238 | if (ch == end_ch |
| 5239 | # if BASH_SUBSTR || BASH_PATTERN_SUBST |
| 5240 | || ch == end_char2 |
| 5241 | # endif |
| 5242 | ) { |
| 5243 | if (!dbl) |
| 5244 | break; |
| 5245 | /* we look for closing )) of $((EXPR)) */ |
| 5246 | if (i_peek_and_eat_bkslash_nl(input) == end_ch) { |
| 5247 | i_getch(input); /* eat second ')' */ |
| 5248 | break; |
| 5249 | } |
| 5250 | } |
| 5251 | o_addchr(dest, ch); |
| 5252 | //bb_error_msg("%s:o_addchr('%c')", __func__, ch); |
| 5253 | if (ch == '(' || ch == '{') { |
| 5254 | ch = (ch == '(' ? ')' : '}'); |
| 5255 | if (!add_till_closing_bracket(dest, input, ch)) |
| 5256 | return 0; |
| 5257 | o_addchr(dest, ch); |
| 5258 | continue; |
| 5259 | } |
| 5260 | if (ch == '\'') { |
| 5261 | if (!add_till_single_quote(dest, input)) |
| 5262 | return 0; |
| 5263 | o_addchr(dest, ch); |
| 5264 | continue; |
| 5265 | } |
| 5266 | if (ch == '"') { |
| 5267 | if (!add_till_double_quote(dest, input)) |
| 5268 | return 0; |
| 5269 | o_addchr(dest, ch); |
| 5270 | continue; |
| 5271 | } |
| 5272 | if (ch == '`') { |
| 5273 | if (!add_till_backquote(dest, input, /*in_dquote:*/ 0)) |
| 5274 | return 0; |
| 5275 | o_addchr(dest, ch); |
| 5276 | continue; |
| 5277 | } |
| 5278 | if (ch == '\\') { |
| 5279 | /* \x. Copy verbatim. Important for \(, \) */ |
| 5280 | ch = i_getch(input); |
| 5281 | if (ch == EOF) { |
| 5282 | syntax_error_unterm_ch(end_ch); |
| 5283 | return 0; |
| 5284 | } |
| 5285 | # if 0 |
| 5286 | if (ch == '\n') { |
| 5287 | /* "backslash+newline", ignore both */ |
| 5288 | o_delchr(dest); /* undo insertion of '\' */ |
| 5289 | continue; |
| 5290 | } |
| 5291 | # endif |
| 5292 | o_addchr(dest, ch); |
| 5293 | //bb_error_msg("%s:o_addchr('%c') after '\\'", __func__, ch); |
| 5294 | continue; |
| 5295 | } |
| 5296 | } |
| 5297 | debug_printf_parse("%s return '%s' ch:'%c'\n", __func__, dest->data, ch); |
| 5298 | return ch; |
| 5299 | } |
| 5300 | #endif /* ENABLE_HUSH_TICK || ENABLE_FEATURE_SH_MATH || ENABLE_HUSH_DOLLAR_OPS */ |
| 5301 | |
| 5302 | #if BASH_DOLLAR_SQUOTE |
| 5303 | /* Return code: 1 for "found and parsed", 0 for "seen something else" */ |
| 5304 | # if BB_MMU |
| 5305 | #define parse_dollar_squote(as_string, dest, input) \ |
| 5306 | parse_dollar_squote(dest, input) |
| 5307 | #define as_string NULL |
| 5308 | # endif |
| 5309 | static int parse_dollar_squote(o_string *as_string, o_string *dest, struct in_str *input) |
| 5310 | { |
| 5311 | int start; |
| 5312 | int ch = i_peek_and_eat_bkslash_nl(input); /* first character after the $ */ |
| 5313 | debug_printf_parse("parse_dollar_squote entered: ch='%c'\n", ch); |
| 5314 | if (ch != '\'') |
| 5315 | return 0; |
| 5316 | |
| 5317 | dest->has_quoted_part = 1; |
| 5318 | start = dest->length; |
| 5319 | |
| 5320 | ch = i_getch(input); /* eat ' */ |
| 5321 | nommu_addchr(as_string, ch); |
| 5322 | while (1) { |
| 5323 | ch = i_getch(input); |
| 5324 | nommu_addchr(as_string, ch); |
| 5325 | if (ch == EOF) { |
| 5326 | syntax_error_unterm_ch('\''); |
| 5327 | return 0; |
| 5328 | } |
| 5329 | if (ch == '\'') |
| 5330 | break; |
| 5331 | if (ch == SPECIAL_VAR_SYMBOL) { |
| 5332 | /* Convert raw ^C to corresponding special variable reference */ |
| 5333 | o_addchr(dest, SPECIAL_VAR_SYMBOL); |
| 5334 | o_addchr(dest, SPECIAL_VAR_QUOTED_SVS); |
| 5335 | /* will addchr() another SPECIAL_VAR_SYMBOL (see after the if() block) */ |
| 5336 | } else if (ch == '\\') { |
| 5337 | static const char C_escapes[] ALIGN1 = "nrbtfav""x\\01234567"; |
| 5338 | |
| 5339 | ch = i_getch(input); |
| 5340 | nommu_addchr(as_string, ch); |
| 5341 | if (strchr(C_escapes, ch)) { |
| 5342 | char buf[4]; |
| 5343 | char *p = buf; |
| 5344 | int cnt = 2; |
| 5345 | |
| 5346 | buf[0] = ch; |
| 5347 | if ((unsigned char)(ch - '0') <= 7) { /* \ooo */ |
| 5348 | do { |
| 5349 | ch = i_peek(input); |
| 5350 | if ((unsigned char)(ch - '0') > 7) |
| 5351 | break; |
| 5352 | *++p = ch = i_getch(input); |
| 5353 | nommu_addchr(as_string, ch); |
| 5354 | } while (--cnt != 0); |
| 5355 | } else if (ch == 'x') { /* \xHH */ |
| 5356 | do { |
| 5357 | ch = i_peek(input); |
| 5358 | if (!isxdigit(ch)) |
| 5359 | break; |
| 5360 | *++p = ch = i_getch(input); |
| 5361 | nommu_addchr(as_string, ch); |
| 5362 | } while (--cnt != 0); |
| 5363 | if (cnt == 2) { /* \x but next char is "bad" */ |
| 5364 | ch = 'x'; |
| 5365 | goto unrecognized; |
| 5366 | } |
| 5367 | } /* else simple seq like \\ or \t */ |
| 5368 | *++p = '\0'; |
| 5369 | p = buf; |
| 5370 | ch = bb_process_escape_sequence((void*)&p); |
| 5371 | //bb_error_msg("buf:'%s' ch:%x", buf, ch); |
| 5372 | if (ch == '\0') |
| 5373 | continue; /* bash compat: $'...\0...' emits nothing */ |
| 5374 | } else { /* unrecognized "\z": encode both chars unless ' or " */ |
| 5375 | if (ch != '\'' && ch != '"') { |
| 5376 | unrecognized: |
| 5377 | o_addqchr(dest, '\\'); |
| 5378 | } |
| 5379 | } |
| 5380 | } /* if (\...) */ |
| 5381 | o_addqchr(dest, ch); |
| 5382 | } |
| 5383 | |
| 5384 | if (dest->length == start) { |
| 5385 | /* $'', $'\0', $'\000\x00' and the like */ |
| 5386 | o_addchr(dest, SPECIAL_VAR_SYMBOL); |
| 5387 | o_addchr(dest, SPECIAL_VAR_SYMBOL); |
| 5388 | } |
| 5389 | |
| 5390 | return 1; |
| 5391 | # undef as_string |
| 5392 | } |
| 5393 | #else |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 5394 | # define parse_dollar_squote(as_string, dest, input) 0 |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 5395 | #endif /* BASH_DOLLAR_SQUOTE */ |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 5396 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 5397 | |
| 5398 | /* Return code: 0 for OK, 1 for syntax error */ |
| 5399 | #if BB_MMU |
| 5400 | #define parse_dollar(as_string, dest, input, quote_mask) \ |
| 5401 | parse_dollar(dest, input, quote_mask) |
| 5402 | #define as_string NULL |
| 5403 | #endif |
| 5404 | static int parse_dollar(o_string *as_string, |
| 5405 | o_string *dest, |
| 5406 | struct in_str *input, unsigned char quote_mask) |
| 5407 | { |
| 5408 | int ch = i_peek_and_eat_bkslash_nl(input); /* first character after the $ */ |
| 5409 | |
| 5410 | debug_printf_parse("parse_dollar entered: ch='%c' quote_mask:0x%x\n", ch, quote_mask); |
| 5411 | if (isalpha(ch)) { |
| 5412 | make_var: |
| 5413 | ch = i_getch(input); |
| 5414 | nommu_addchr(as_string, ch); |
| 5415 | /*make_var1:*/ |
| 5416 | o_addchr(dest, SPECIAL_VAR_SYMBOL); |
| 5417 | while (1) { |
| 5418 | debug_printf_parse(": '%c'\n", ch); |
| 5419 | o_addchr(dest, ch | quote_mask); |
| 5420 | quote_mask = 0; |
| 5421 | ch = i_peek_and_eat_bkslash_nl(input); |
| 5422 | if (!isalnum(ch) && ch != '_') { |
| 5423 | /* End of variable name reached */ |
| 5424 | break; |
| 5425 | } |
| 5426 | ch = i_getch(input); |
| 5427 | nommu_addchr(as_string, ch); |
| 5428 | } |
| 5429 | o_addchr(dest, SPECIAL_VAR_SYMBOL); |
| 5430 | } else if (isdigit(ch)) { |
| 5431 | make_one_char_var: |
| 5432 | ch = i_getch(input); |
| 5433 | nommu_addchr(as_string, ch); |
| 5434 | o_addchr(dest, SPECIAL_VAR_SYMBOL); |
| 5435 | debug_printf_parse(": '%c'\n", ch); |
| 5436 | o_addchr(dest, ch | quote_mask); |
| 5437 | o_addchr(dest, SPECIAL_VAR_SYMBOL); |
| 5438 | } else switch (ch) { |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 5439 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 5440 | case '$': /* pid */ |
| 5441 | case '!': /* last bg pid */ |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 5442 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 5443 | case '?': /* last exit code */ |
| 5444 | case '#': /* number of args */ |
| 5445 | case '*': /* args */ |
| 5446 | case '@': /* args */ |
| 5447 | case '-': /* $- option flags set by set builtin or shell options (-i etc) */ |
| 5448 | goto make_one_char_var; |
| 5449 | case '{': { |
| 5450 | char len_single_ch; |
| 5451 | |
| 5452 | o_addchr(dest, SPECIAL_VAR_SYMBOL); |
| 5453 | |
| 5454 | ch = i_getch(input); /* eat '{' */ |
| 5455 | nommu_addchr(as_string, ch); |
| 5456 | |
| 5457 | ch = i_getch_and_eat_bkslash_nl(input); /* first char after '{' */ |
| 5458 | /* It should be ${?}, or ${#var}, |
| 5459 | * or even ${?+subst} - operator acting on a special variable, |
| 5460 | * or the beginning of variable name. |
| 5461 | */ |
| 5462 | if (ch == EOF |
| 5463 | || (!strchr(_SPECIAL_VARS_STR, ch) && !isalnum(ch)) /* not one of those */ |
| 5464 | ) { |
| 5465 | bad_dollar_syntax: |
| 5466 | syntax_error_unterm_str("${name}"); |
| 5467 | debug_printf_parse("parse_dollar return 0: unterminated ${name}\n"); |
| 5468 | return 0; |
| 5469 | } |
| 5470 | nommu_addchr(as_string, ch); |
| 5471 | len_single_ch = ch; |
| 5472 | ch |= quote_mask; |
| 5473 | |
| 5474 | /* It's possible to just call add_till_closing_bracket() at this point. |
| 5475 | * However, this regresses some of our testsuite cases |
| 5476 | * which check invalid constructs like ${%}. |
| 5477 | * Oh well... let's check that the var name part is fine... */ |
| 5478 | |
| 5479 | if (isdigit(len_single_ch) |
| 5480 | || (len_single_ch == '#' && isdigit(i_peek_and_eat_bkslash_nl(input))) |
| 5481 | ) { |
| 5482 | /* Execution engine uses plain xatoi_positive() |
| 5483 | * to interpret ${NNN} and {#NNN}, |
| 5484 | * check syntax here in the parser. |
| 5485 | * (bash does not support expressions in ${#NN}, |
| 5486 | * e.g. ${#$var} and {#1:+WORD} are not supported). |
| 5487 | */ |
| 5488 | unsigned cnt = 9; /* max 9 digits for ${NN} and 8 for {#NN} */ |
| 5489 | while (1) { |
| 5490 | o_addchr(dest, ch); |
| 5491 | debug_printf_parse(": '%c'\n", ch); |
| 5492 | ch = i_getch_and_eat_bkslash_nl(input); |
| 5493 | nommu_addchr(as_string, ch); |
| 5494 | if (ch == '}') |
| 5495 | break; |
| 5496 | if (--cnt == 0) |
| 5497 | goto bad_dollar_syntax; |
| 5498 | if (len_single_ch != '#' && strchr(VAR_SUBST_OPS, ch)) |
| 5499 | /* ${NN<op>...} is valid */ |
| 5500 | goto eat_until_closing; |
| 5501 | if (!isdigit(ch)) |
| 5502 | goto bad_dollar_syntax; |
| 5503 | } |
| 5504 | } else |
| 5505 | while (1) { |
| 5506 | unsigned pos; |
| 5507 | |
| 5508 | o_addchr(dest, ch); |
| 5509 | debug_printf_parse(": '%c'\n", ch); |
| 5510 | |
| 5511 | ch = i_getch(input); |
| 5512 | nommu_addchr(as_string, ch); |
| 5513 | if (ch == '}') |
| 5514 | break; |
Francis Laniel | 74e4254 | 2023-12-22 22:02:33 +0100 | [diff] [blame] | 5515 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 5516 | if (!isalnum(ch) && ch != '_') { |
Francis Laniel | 74e4254 | 2023-12-22 22:02:33 +0100 | [diff] [blame] | 5517 | #else /* __U_BOOT__ */ |
| 5518 | /* |
| 5519 | * In several places in U-Boot, we use variable like |
| 5520 | * foo# (e.g. serial#), particularly in env. |
| 5521 | * So, we need to authorize # to appear inside |
| 5522 | * variable name and then expand this variable. |
| 5523 | * NOTE Having # in variable name is not permitted in |
| 5524 | * upstream hush but expansion will be done (even though |
| 5525 | * the result will be empty). |
| 5526 | */ |
| 5527 | if (!isalnum(ch) && ch != '_' && ch != '#') { |
| 5528 | #endif /* __U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 5529 | unsigned end_ch; |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 5530 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 5531 | unsigned char last_ch; |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 5532 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 5533 | /* handle parameter expansions |
| 5534 | * http://www.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html#tag_02_06_02 |
| 5535 | */ |
| 5536 | if (!strchr(VAR_SUBST_OPS, ch)) { /* ${var<bad_char>... */ |
| 5537 | if (len_single_ch != '#' |
| 5538 | /*|| !strchr(SPECIAL_VARS_STR, ch) - disallow errors like ${#+} ? */ |
| 5539 | || i_peek(input) != '}' |
| 5540 | ) { |
| 5541 | goto bad_dollar_syntax; |
| 5542 | } |
| 5543 | /* else: it's "length of C" ${#C} op, |
| 5544 | * where C is a single char |
| 5545 | * special var name, e.g. ${#!}. |
| 5546 | */ |
| 5547 | } |
| 5548 | eat_until_closing: |
| 5549 | /* Eat everything until closing '}' (or ':') */ |
| 5550 | end_ch = '}'; |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 5551 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 5552 | if (BASH_SUBSTR |
| 5553 | && ch == ':' |
| 5554 | && !strchr(MINUS_PLUS_EQUAL_QUESTION, i_peek(input)) |
| 5555 | ) { |
| 5556 | /* It's ${var:N[:M]} thing */ |
| 5557 | end_ch = '}' * 0x100 + ':'; |
| 5558 | } |
| 5559 | if (BASH_PATTERN_SUBST |
| 5560 | && ch == '/' |
| 5561 | ) { |
| 5562 | /* It's ${var/[/]pattern[/repl]} thing */ |
| 5563 | if (i_peek(input) == '/') { /* ${var//pattern[/repl]}? */ |
| 5564 | i_getch(input); |
| 5565 | nommu_addchr(as_string, '/'); |
| 5566 | ch = '\\'; |
| 5567 | } |
| 5568 | end_ch = '}' * 0x100 + '/'; |
| 5569 | } |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 5570 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 5571 | o_addchr(dest, ch); |
| 5572 | /* The pattern can't be empty. |
| 5573 | * IOW: if the first char after "${v//" is a slash, |
| 5574 | * it does not terminate the pattern - it's the first char of the pattern: |
| 5575 | * v=/dev/ram; echo ${v////-} prints -dev-ram (pattern is "/") |
| 5576 | * v=/dev/ram; echo ${v///r/-} prints /dev-am (pattern is "/r") |
| 5577 | */ |
| 5578 | if (i_peek(input) == '/') { |
| 5579 | o_addchr(dest, i_getch(input)); |
| 5580 | } |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 5581 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 5582 | again: |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 5583 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 5584 | if (!BB_MMU) |
| 5585 | pos = dest->length; |
| 5586 | #if ENABLE_HUSH_DOLLAR_OPS |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 5587 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 5588 | last_ch = add_till_closing_bracket(dest, input, end_ch); |
| 5589 | if (last_ch == 0) /* error? */ |
| 5590 | return 0; |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 5591 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 5592 | #else |
| 5593 | # error Simple code to only allow ${var} is not implemented |
| 5594 | #endif |
| 5595 | if (as_string) { |
| 5596 | o_addstr(as_string, dest->data + pos); |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 5597 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 5598 | o_addchr(as_string, last_ch); |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 5599 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 5600 | } |
| 5601 | |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 5602 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 5603 | if ((BASH_SUBSTR || BASH_PATTERN_SUBST) |
| 5604 | && (end_ch & 0xff00) |
| 5605 | ) { |
| 5606 | /* close the first block: */ |
| 5607 | o_addchr(dest, SPECIAL_VAR_SYMBOL); |
| 5608 | /* while parsing N from ${var:N[:M]} |
| 5609 | * or pattern from ${var/[/]pattern[/repl]} */ |
| 5610 | if ((end_ch & 0xff) == last_ch) { |
| 5611 | /* got ':' or '/'- parse the rest */ |
| 5612 | end_ch = '}'; |
| 5613 | goto again; |
| 5614 | } |
| 5615 | /* got '}' */ |
| 5616 | if (BASH_SUBSTR && end_ch == '}' * 0x100 + ':') { |
| 5617 | /* it's ${var:N} - emulate :999999999 */ |
| 5618 | o_addstr(dest, "999999999"); |
| 5619 | } /* else: it's ${var/[/]pattern} */ |
| 5620 | } |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 5621 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 5622 | break; |
| 5623 | } |
| 5624 | len_single_ch = 0; /* it can't be ${#C} op */ |
| 5625 | } |
| 5626 | o_addchr(dest, SPECIAL_VAR_SYMBOL); |
| 5627 | break; |
| 5628 | } |
| 5629 | #if ENABLE_FEATURE_SH_MATH || ENABLE_HUSH_TICK |
| 5630 | case '(': { |
| 5631 | unsigned pos; |
| 5632 | |
| 5633 | ch = i_getch(input); |
| 5634 | nommu_addchr(as_string, ch); |
| 5635 | # if ENABLE_FEATURE_SH_MATH |
| 5636 | if (i_peek_and_eat_bkslash_nl(input) == '(') { |
| 5637 | ch = i_getch(input); |
| 5638 | nommu_addchr(as_string, ch); |
| 5639 | o_addchr(dest, SPECIAL_VAR_SYMBOL); |
| 5640 | o_addchr(dest, quote_mask | '+'); |
| 5641 | if (!BB_MMU) |
| 5642 | pos = dest->length; |
| 5643 | if (!add_till_closing_bracket(dest, input, ')' | DOUBLE_CLOSE_CHAR_FLAG)) |
| 5644 | return 0; /* error */ |
| 5645 | if (as_string) { |
| 5646 | o_addstr(as_string, dest->data + pos); |
| 5647 | o_addchr(as_string, ')'); |
| 5648 | o_addchr(as_string, ')'); |
| 5649 | } |
| 5650 | o_addchr(dest, SPECIAL_VAR_SYMBOL); |
| 5651 | break; |
| 5652 | } |
| 5653 | # endif |
| 5654 | # if ENABLE_HUSH_TICK |
| 5655 | o_addchr(dest, SPECIAL_VAR_SYMBOL); |
| 5656 | o_addchr(dest, quote_mask | '`'); |
| 5657 | if (!BB_MMU) |
| 5658 | pos = dest->length; |
| 5659 | if (!add_till_closing_bracket(dest, input, ')')) |
| 5660 | return 0; /* error */ |
| 5661 | if (as_string) { |
| 5662 | o_addstr(as_string, dest->data + pos); |
| 5663 | o_addchr(as_string, ')'); |
| 5664 | } |
| 5665 | o_addchr(dest, SPECIAL_VAR_SYMBOL); |
| 5666 | # endif |
| 5667 | break; |
| 5668 | } |
| 5669 | #endif |
| 5670 | case '_': |
| 5671 | goto make_var; |
| 5672 | #if 0 |
| 5673 | /* TODO: $_: */ |
| 5674 | /* $_ Shell or shell script name; or last argument of last command |
| 5675 | * (if last command wasn't a pipe; if it was, bash sets $_ to ""); |
| 5676 | * but in command's env, set to full pathname used to invoke it */ |
| 5677 | ch = i_getch(input); |
| 5678 | nommu_addchr(as_string, ch); |
| 5679 | ch = i_peek_and_eat_bkslash_nl(input); |
| 5680 | if (isalnum(ch)) { /* it's $_name or $_123 */ |
| 5681 | ch = '_'; |
| 5682 | goto make_var1; |
| 5683 | } |
| 5684 | /* else: it's $_ */ |
| 5685 | #endif |
| 5686 | default: |
| 5687 | o_addQchr(dest, '$'); |
| 5688 | } |
| 5689 | debug_printf_parse("parse_dollar return 1 (ok)\n"); |
| 5690 | return 1; |
| 5691 | #undef as_string |
| 5692 | } |
| 5693 | |
| 5694 | #if BB_MMU |
| 5695 | #define encode_string(as_string, dest, input, dquote_end) \ |
| 5696 | encode_string(dest, input, dquote_end) |
| 5697 | #define as_string NULL |
| 5698 | #endif |
| 5699 | static int encode_string(o_string *as_string, |
| 5700 | o_string *dest, |
| 5701 | struct in_str *input, |
| 5702 | int dquote_end) |
| 5703 | { |
| 5704 | int ch; |
| 5705 | int next; |
| 5706 | |
| 5707 | again: |
| 5708 | ch = i_getch(input); |
| 5709 | if (ch != EOF) |
| 5710 | nommu_addchr(as_string, ch); |
| 5711 | if (ch == dquote_end) { /* may be only '"' or EOF */ |
| 5712 | debug_printf_parse("encode_string return 1 (ok)\n"); |
| 5713 | return 1; |
| 5714 | } |
| 5715 | /* note: can't move it above ch == dquote_end check! */ |
| 5716 | if (ch == EOF) { |
| 5717 | syntax_error_unterm_ch('"'); |
| 5718 | return 0; /* error */ |
| 5719 | } |
| 5720 | next = '\0'; |
| 5721 | if (ch != '\n') { |
| 5722 | next = i_peek(input); |
| 5723 | } |
| 5724 | debug_printf_parse("\" ch=%c (%d) escape=%d\n", |
| 5725 | ch, ch, !!(dest->o_expflags & EXP_FLAG_ESC_GLOB_CHARS)); |
| 5726 | if (ch == '\\') { |
| 5727 | if (next == EOF) { |
| 5728 | /* Testcase: in interactive shell a file with |
| 5729 | * echo "unterminated string\<eof> |
| 5730 | * is sourced. |
| 5731 | */ |
| 5732 | syntax_error_unterm_ch('"'); |
| 5733 | return 0; /* error */ |
| 5734 | } |
| 5735 | /* bash: |
| 5736 | * "The backslash retains its special meaning [in "..."] |
| 5737 | * only when followed by one of the following characters: |
| 5738 | * $, `, ", \, or <newline>. A double quote may be quoted |
| 5739 | * within double quotes by preceding it with a backslash." |
| 5740 | * NB: in (unquoted) heredoc, above does not apply to ", |
| 5741 | * therefore we check for it by "next == dquote_end" cond. |
| 5742 | */ |
| 5743 | if (next == dquote_end || strchr("$`\\\n", next)) { |
| 5744 | ch = i_getch(input); /* eat next */ |
| 5745 | if (ch == '\n') |
| 5746 | goto again; /* skip \<newline> */ |
| 5747 | } /* else: ch remains == '\\', and we double it below: */ |
| 5748 | o_addqchr(dest, ch); /* \c if c is a glob char, else just c */ |
| 5749 | nommu_addchr(as_string, ch); |
| 5750 | goto again; |
| 5751 | } |
| 5752 | if (ch == '$') { |
| 5753 | //if (parse_dollar_squote(as_string, dest, input)) |
| 5754 | // goto again; |
| 5755 | if (!parse_dollar(as_string, dest, input, /*quote_mask:*/ 0x80)) { |
| 5756 | debug_printf_parse("encode_string return 0: " |
| 5757 | "parse_dollar returned 0 (error)\n"); |
| 5758 | return 0; |
| 5759 | } |
| 5760 | goto again; |
| 5761 | } |
| 5762 | #if ENABLE_HUSH_TICK |
| 5763 | if (ch == '`') { |
| 5764 | //unsigned pos = dest->length; |
| 5765 | o_addchr(dest, SPECIAL_VAR_SYMBOL); |
| 5766 | o_addchr(dest, 0x80 | '`'); |
| 5767 | if (!add_till_backquote(dest, input, /*in_dquote:*/ dquote_end == '"')) |
| 5768 | return 0; /* error */ |
| 5769 | o_addchr(dest, SPECIAL_VAR_SYMBOL); |
| 5770 | //debug_printf_subst("SUBST RES3 '%s'\n", dest->data + pos); |
| 5771 | goto again; |
| 5772 | } |
| 5773 | #endif |
| 5774 | o_addQchr(dest, ch); |
| 5775 | if (ch == SPECIAL_VAR_SYMBOL) { |
| 5776 | /* Convert "^C" to corresponding special variable reference */ |
| 5777 | o_addchr(dest, SPECIAL_VAR_QUOTED_SVS); |
| 5778 | o_addchr(dest, SPECIAL_VAR_SYMBOL); |
| 5779 | } |
| 5780 | goto again; |
| 5781 | #undef as_string |
| 5782 | } |
| 5783 | |
| 5784 | /* |
| 5785 | * Scan input until EOF or end_trigger char. |
| 5786 | * Return a list of pipes to execute, or NULL on EOF |
| 5787 | * or if end_trigger character is met. |
| 5788 | * On syntax error, exit if shell is not interactive, |
| 5789 | * reset parsing machinery and start parsing anew, |
| 5790 | * or return ERR_PTR. |
| 5791 | */ |
| 5792 | static struct pipe *parse_stream(char **pstring, |
| 5793 | int *heredoc_cnt_ptr, |
| 5794 | struct in_str *input, |
| 5795 | int end_trigger) |
| 5796 | { |
| 5797 | struct parse_context ctx; |
| 5798 | int heredoc_cnt; |
| 5799 | |
| 5800 | /* Single-quote triggers a bypass of the main loop until its mate is |
| 5801 | * found. When recursing, quote state is passed in via ctx.word.o_expflags. |
| 5802 | */ |
| 5803 | debug_printf_parse("parse_stream entered, end_trigger='%c'\n", |
| 5804 | end_trigger ? end_trigger : 'X'); |
| 5805 | debug_enter(); |
| 5806 | |
| 5807 | initialize_context(&ctx); |
| 5808 | |
| 5809 | /* If very first arg is "" or '', ctx.word.data may end up NULL. |
| 5810 | * Preventing this: |
| 5811 | */ |
| 5812 | ctx.word.data = xzalloc(1); /* start as "", not as NULL */ |
| 5813 | |
| 5814 | /* We used to separate words on $IFS here. This was wrong. |
| 5815 | * $IFS is used only for word splitting when $var is expanded, |
| 5816 | * here we should use blank chars as separators, not $IFS |
| 5817 | */ |
| 5818 | |
| 5819 | heredoc_cnt = 0; |
| 5820 | while (1) { |
| 5821 | const char *is_blank; |
| 5822 | const char *is_special; |
| 5823 | int ch; |
| 5824 | int next; |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 5825 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 5826 | int redir_fd; |
| 5827 | redir_type redir_style; |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 5828 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 5829 | |
| 5830 | ch = i_getch(input); |
| 5831 | debug_printf_parse(": ch=%c (%d) escape=%d\n", |
| 5832 | ch, ch, !!(ctx.word.o_expflags & EXP_FLAG_ESC_GLOB_CHARS)); |
| 5833 | if (ch == EOF) { |
| 5834 | struct pipe *pi; |
| 5835 | |
| 5836 | if (heredoc_cnt) { |
| 5837 | syntax_error_unterm_str("here document"); |
| 5838 | goto parse_error_exitcode1; |
| 5839 | } |
| 5840 | if (end_trigger == ')') { |
| 5841 | syntax_error_unterm_ch('('); |
| 5842 | goto parse_error_exitcode1; |
| 5843 | } |
| 5844 | if (end_trigger == '}') { |
| 5845 | syntax_error_unterm_ch('{'); |
| 5846 | goto parse_error_exitcode1; |
| 5847 | } |
| 5848 | |
| 5849 | if (done_word(&ctx)) { |
| 5850 | goto parse_error_exitcode1; |
| 5851 | } |
| 5852 | o_free_and_set_NULL(&ctx.word); |
| 5853 | done_pipe(&ctx, PIPE_SEQ); |
| 5854 | pi = ctx.list_head; |
| 5855 | /* If we got nothing... */ |
| 5856 | /* (this makes bare "&" cmd a no-op. |
| 5857 | * bash says: "syntax error near unexpected token '&'") */ |
| 5858 | if (pi->num_cmds == 0 |
| 5859 | IF_HAS_KEYWORDS(&& pi->res_word == RES_NONE) |
| 5860 | ) { |
| 5861 | free_pipe_list(pi); |
| 5862 | pi = NULL; |
| 5863 | } |
| 5864 | #if !BB_MMU |
| 5865 | debug_printf_parse("as_string1 '%s'\n", ctx.as_string.data); |
| 5866 | if (pstring) |
| 5867 | *pstring = ctx.as_string.data; |
| 5868 | else |
| 5869 | o_free(&ctx.as_string); |
| 5870 | #endif |
| 5871 | // heredoc_cnt must be 0 here anyway |
| 5872 | //if (heredoc_cnt_ptr) |
| 5873 | // *heredoc_cnt_ptr = heredoc_cnt; |
| 5874 | debug_leave(); |
| 5875 | debug_printf_heredoc("parse_stream return heredoc_cnt:%d\n", heredoc_cnt); |
| 5876 | debug_printf_parse("parse_stream return %p\n", pi); |
| 5877 | return pi; |
| 5878 | } |
| 5879 | |
| 5880 | /* Handle "'" and "\" first, as they won't play nice with |
| 5881 | * i_peek_and_eat_bkslash_nl() anyway: |
| 5882 | * echo z\\ |
| 5883 | * and |
| 5884 | * echo '\ |
| 5885 | * ' |
| 5886 | * would break. |
| 5887 | */ |
| 5888 | if (ch == '\\') { |
| 5889 | ch = i_getch(input); |
| 5890 | if (ch == '\n') |
| 5891 | continue; /* drop \<newline>, get next char */ |
| 5892 | nommu_addchr(&ctx.as_string, '\\'); |
| 5893 | if (ch == SPECIAL_VAR_SYMBOL) { |
| 5894 | nommu_addchr(&ctx.as_string, ch); |
| 5895 | /* Convert \^C to corresponding special variable reference */ |
| 5896 | goto case_SPECIAL_VAR_SYMBOL; |
| 5897 | } |
| 5898 | o_addchr(&ctx.word, '\\'); |
| 5899 | if (ch == EOF) { |
| 5900 | /* Testcase: eval 'echo Ok\' */ |
| 5901 | /* bash-4.3.43 was removing backslash, |
| 5902 | * but 4.4.19 retains it, most other shells too |
| 5903 | */ |
| 5904 | continue; /* get next char */ |
| 5905 | } |
| 5906 | /* Example: echo Hello \2>file |
| 5907 | * we need to know that word 2 is quoted |
| 5908 | */ |
| 5909 | ctx.word.has_quoted_part = 1; |
| 5910 | nommu_addchr(&ctx.as_string, ch); |
| 5911 | o_addchr(&ctx.word, ch); |
| 5912 | continue; /* get next char */ |
| 5913 | } |
| 5914 | nommu_addchr(&ctx.as_string, ch); |
| 5915 | if (ch == '\'') { |
| 5916 | ctx.word.has_quoted_part = 1; |
| 5917 | next = i_getch(input); |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 5918 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 5919 | if (next == '\'' && !ctx.pending_redirect) |
| 5920 | goto insert_empty_quoted_str_marker; |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 5921 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 5922 | |
| 5923 | ch = next; |
| 5924 | while (1) { |
| 5925 | if (ch == EOF) { |
| 5926 | syntax_error_unterm_ch('\''); |
| 5927 | goto parse_error_exitcode1; |
| 5928 | } |
| 5929 | nommu_addchr(&ctx.as_string, ch); |
| 5930 | if (ch == '\'') |
| 5931 | break; |
| 5932 | if (ch == SPECIAL_VAR_SYMBOL) { |
| 5933 | /* Convert raw ^C to corresponding special variable reference */ |
| 5934 | o_addchr(&ctx.word, SPECIAL_VAR_SYMBOL); |
| 5935 | o_addchr(&ctx.word, SPECIAL_VAR_QUOTED_SVS); |
| 5936 | } |
| 5937 | o_addqchr(&ctx.word, ch); |
| 5938 | ch = i_getch(input); |
| 5939 | } |
| 5940 | continue; /* get next char */ |
| 5941 | } |
| 5942 | |
| 5943 | next = '\0'; |
| 5944 | if (ch != '\n') |
| 5945 | next = i_peek_and_eat_bkslash_nl(input); |
| 5946 | |
| 5947 | is_special = "{}<>&|();#" /* special outside of "str" */ |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 5948 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 5949 | "$\"" IF_HUSH_TICK("`") /* always special */ |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 5950 | #else /* __U_BOOT__ */ |
| 5951 | "$\"" |
| 5952 | #endif /* __U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 5953 | SPECIAL_VAR_SYMBOL_STR; |
| 5954 | #if defined(CMD_TEST2_SINGLEWORD_NOGLOB) |
| 5955 | if (ctx.command->cmd_type == CMD_TEST2_SINGLEWORD_NOGLOB) { |
| 5956 | /* In [[ ]], {}<>&|() are not special */ |
| 5957 | is_special += 8; |
| 5958 | } else |
| 5959 | #endif |
| 5960 | /* Are { and } special here? */ |
| 5961 | if (ctx.command->argv /* word [word]{... - non-special */ |
| 5962 | || ctx.word.length /* word{... - non-special */ |
| 5963 | || ctx.word.has_quoted_part /* ""{... - non-special */ |
| 5964 | || (next != ';' /* }; - special */ |
| 5965 | && next != ')' /* }) - special */ |
| 5966 | && next != '(' /* {( - special */ |
| 5967 | && next != '&' /* }& and }&& ... - special */ |
| 5968 | && next != '|' /* }|| ... - special */ |
| 5969 | && !strchr(defifs, next) /* {word - non-special */ |
| 5970 | ) |
| 5971 | ) { |
| 5972 | /* They are not special, skip "{}" */ |
| 5973 | is_special += 2; |
| 5974 | } |
| 5975 | is_special = strchr(is_special, ch); |
| 5976 | is_blank = strchr(defifs, ch); |
| 5977 | |
| 5978 | if (!is_special && !is_blank) { /* ordinary char */ |
| 5979 | ordinary_char: |
| 5980 | o_addQchr(&ctx.word, ch); |
| 5981 | if ((ctx.is_assignment == MAYBE_ASSIGNMENT |
| 5982 | || ctx.is_assignment == WORD_IS_KEYWORD) |
| 5983 | && ch == '=' |
| 5984 | && endofname(ctx.word.data)[0] == '=' |
| 5985 | ) { |
| 5986 | ctx.is_assignment = DEFINITELY_ASSIGNMENT; |
| 5987 | debug_printf_parse("ctx.is_assignment='%s'\n", assignment_flag[ctx.is_assignment]); |
| 5988 | } |
| 5989 | continue; |
| 5990 | } |
| 5991 | |
| 5992 | if (is_blank) { |
| 5993 | #if ENABLE_HUSH_LINENO_VAR |
| 5994 | /* Case: |
| 5995 | * "while ...; do<whitespace><newline> |
| 5996 | * cmd ..." |
| 5997 | * would think that "cmd" starts in <whitespace> - |
| 5998 | * i.e., at the previous line. |
| 5999 | * We need to skip all whitespace before newlines. |
| 6000 | */ |
| 6001 | while (ch != '\n') { |
| 6002 | next = i_peek(input); |
| 6003 | if (next != ' ' && next != '\t' && next != '\n') |
| 6004 | break; /* next char is not ws */ |
| 6005 | ch = i_getch(input); |
| 6006 | } |
| 6007 | /* ch == last eaten whitespace char */ |
| 6008 | #endif |
| 6009 | if (done_word(&ctx)) { |
| 6010 | goto parse_error_exitcode1; |
| 6011 | } |
| 6012 | if (ch == '\n') { |
| 6013 | /* Is this a case when newline is simply ignored? |
| 6014 | * Some examples: |
| 6015 | * "cmd | <newline> cmd ..." |
| 6016 | * "case ... in <newline> word) ..." |
| 6017 | */ |
| 6018 | if (IS_NULL_CMD(ctx.command) |
| 6019 | && ctx.word.length == 0 |
| 6020 | && !ctx.word.has_quoted_part |
| 6021 | && heredoc_cnt == 0 |
| 6022 | ) { |
| 6023 | /* This newline can be ignored. But... |
| 6024 | * Without check #1, interactive shell |
| 6025 | * ignores even bare <newline>, |
| 6026 | * and shows the continuation prompt: |
| 6027 | * ps1_prompt$ <enter> |
| 6028 | * ps2> _ <=== wrong, should be ps1 |
| 6029 | * Without check #2, "cmd & <newline>" |
| 6030 | * is similarly mistreated. |
| 6031 | * (BTW, this makes "cmd & cmd" |
| 6032 | * and "cmd && cmd" non-orthogonal. |
| 6033 | * Really, ask yourself, why |
| 6034 | * "cmd && <newline>" doesn't start |
| 6035 | * cmd but waits for more input? |
| 6036 | * The only reason is that it might be |
| 6037 | * a "cmd1 && <nl> cmd2 &" construct, |
| 6038 | * cmd1 may need to run in BG). |
| 6039 | */ |
| 6040 | struct pipe *pi = ctx.list_head; |
| 6041 | if (pi->num_cmds != 0 /* check #1 */ |
| 6042 | && pi->followup != PIPE_BG /* check #2 */ |
| 6043 | ) { |
| 6044 | continue; |
| 6045 | } |
| 6046 | } |
| 6047 | /* Treat newline as a command separator. */ |
| 6048 | done_pipe(&ctx, PIPE_SEQ); |
| 6049 | debug_printf_heredoc("heredoc_cnt:%d\n", heredoc_cnt); |
| 6050 | if (heredoc_cnt) { |
| 6051 | heredoc_cnt = fetch_heredocs(&ctx.as_string, ctx.list_head, heredoc_cnt, input); |
| 6052 | if (heredoc_cnt != 0) |
| 6053 | goto parse_error_exitcode1; |
| 6054 | } |
| 6055 | ctx.is_assignment = MAYBE_ASSIGNMENT; |
| 6056 | debug_printf_parse("ctx.is_assignment='%s'\n", assignment_flag[ctx.is_assignment]); |
| 6057 | ch = ';'; |
| 6058 | /* note: if (is_blank) continue; |
| 6059 | * will still trigger for us */ |
| 6060 | } |
| 6061 | } |
| 6062 | |
| 6063 | /* "cmd}" or "cmd }..." without semicolon or &: |
| 6064 | * } is an ordinary char in this case, even inside { cmd; } |
| 6065 | * Pathological example: { ""}; } should exec "}" cmd |
| 6066 | */ |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 6067 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 6068 | if (ch == '}') { |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 6069 | #else /* __U_BOOT__ */ |
| 6070 | if (ch == '}' || ch == ')') { |
| 6071 | #endif /* __U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 6072 | if (ctx.word.length != 0 /* word} */ |
| 6073 | || ctx.word.has_quoted_part /* ""} */ |
| 6074 | ) { |
| 6075 | goto ordinary_char; |
| 6076 | } |
| 6077 | if (!IS_NULL_CMD(ctx.command)) { /* cmd } */ |
| 6078 | /* Generally, there should be semicolon: "cmd; }" |
| 6079 | * However, bash allows to omit it if "cmd" is |
| 6080 | * a group. Examples: |
| 6081 | * { { echo 1; } } |
| 6082 | * {(echo 1)} |
| 6083 | * { echo 0 >&2 | { echo 1; } } |
| 6084 | * { while false; do :; done } |
| 6085 | * { case a in b) ;; esac } |
| 6086 | */ |
| 6087 | if (ctx.command->group) |
| 6088 | goto term_group; |
| 6089 | goto ordinary_char; |
| 6090 | } |
| 6091 | if (!IS_NULL_PIPE(ctx.pipe)) /* cmd | } */ |
| 6092 | /* Can't be an end of {cmd}, skip the check */ |
| 6093 | goto skip_end_trigger; |
| 6094 | /* else: } does terminate a group */ |
| 6095 | } |
| 6096 | term_group: |
| 6097 | if (end_trigger && end_trigger == ch |
| 6098 | && (ch != ';' || heredoc_cnt == 0) |
| 6099 | #if ENABLE_HUSH_CASE |
| 6100 | && (ch != ')' |
| 6101 | || ctx.ctx_res_w != RES_MATCH |
| 6102 | || (!ctx.word.has_quoted_part && strcmp(ctx.word.data, "esac") == 0) |
| 6103 | ) |
| 6104 | #endif |
| 6105 | ) { |
| 6106 | if (done_word(&ctx)) { |
| 6107 | goto parse_error_exitcode1; |
| 6108 | } |
| 6109 | done_pipe(&ctx, PIPE_SEQ); |
| 6110 | ctx.is_assignment = MAYBE_ASSIGNMENT; |
| 6111 | debug_printf_parse("ctx.is_assignment='%s'\n", assignment_flag[ctx.is_assignment]); |
| 6112 | /* Do we sit outside of any if's, loops or case's? */ |
| 6113 | if (!HAS_KEYWORDS |
| 6114 | IF_HAS_KEYWORDS(|| (ctx.ctx_res_w == RES_NONE && ctx.old_flag == 0)) |
| 6115 | ) { |
| 6116 | o_free_and_set_NULL(&ctx.word); |
| 6117 | #if !BB_MMU |
| 6118 | debug_printf_parse("as_string2 '%s'\n", ctx.as_string.data); |
| 6119 | if (pstring) |
| 6120 | *pstring = ctx.as_string.data; |
| 6121 | else |
| 6122 | o_free(&ctx.as_string); |
| 6123 | #endif |
| 6124 | if (ch != ';' && IS_NULL_PIPE(ctx.list_head)) { |
| 6125 | /* Example: bare "{ }", "()" */ |
| 6126 | G.last_exitcode = 2; /* bash compat */ |
| 6127 | syntax_error_unexpected_ch(ch); |
| 6128 | goto parse_error; |
| 6129 | } |
| 6130 | if (heredoc_cnt_ptr) |
| 6131 | *heredoc_cnt_ptr = heredoc_cnt; |
| 6132 | debug_printf_heredoc("parse_stream return heredoc_cnt:%d\n", heredoc_cnt); |
| 6133 | debug_printf_parse("parse_stream return %p: " |
| 6134 | "end_trigger char found\n", |
| 6135 | ctx.list_head); |
| 6136 | debug_leave(); |
| 6137 | return ctx.list_head; |
| 6138 | } |
| 6139 | } |
| 6140 | |
| 6141 | if (is_blank) |
| 6142 | continue; |
| 6143 | |
| 6144 | /* Catch <, > before deciding whether this word is |
| 6145 | * an assignment. a=1 2>z b=2: b=2 is still assignment */ |
| 6146 | switch (ch) { |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 6147 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 6148 | case '>': |
| 6149 | redir_fd = redirect_opt_num(&ctx.word); |
| 6150 | if (done_word(&ctx)) { |
| 6151 | goto parse_error_exitcode1; |
| 6152 | } |
| 6153 | redir_style = REDIRECT_OVERWRITE; |
| 6154 | if (next == '>') { |
| 6155 | redir_style = REDIRECT_APPEND; |
| 6156 | ch = i_getch(input); |
| 6157 | nommu_addchr(&ctx.as_string, ch); |
| 6158 | } |
| 6159 | #if 0 |
| 6160 | else if (next == '(') { |
| 6161 | syntax_error(">(process) not supported"); |
| 6162 | goto parse_error_exitcode1; |
| 6163 | } |
| 6164 | #endif |
| 6165 | if (parse_redirect(&ctx, redir_fd, redir_style, input)) |
| 6166 | goto parse_error_exitcode1; |
| 6167 | continue; /* get next char */ |
| 6168 | case '<': |
| 6169 | redir_fd = redirect_opt_num(&ctx.word); |
| 6170 | if (done_word(&ctx)) { |
| 6171 | goto parse_error_exitcode1; |
| 6172 | } |
| 6173 | redir_style = REDIRECT_INPUT; |
| 6174 | if (next == '<') { |
| 6175 | redir_style = REDIRECT_HEREDOC; |
| 6176 | heredoc_cnt++; |
| 6177 | debug_printf_heredoc("++heredoc_cnt=%d\n", heredoc_cnt); |
| 6178 | ch = i_getch(input); |
| 6179 | nommu_addchr(&ctx.as_string, ch); |
| 6180 | } else if (next == '>') { |
| 6181 | redir_style = REDIRECT_IO; |
| 6182 | ch = i_getch(input); |
| 6183 | nommu_addchr(&ctx.as_string, ch); |
| 6184 | } |
| 6185 | #if 0 |
| 6186 | else if (next == '(') { |
| 6187 | syntax_error("<(process) not supported"); |
| 6188 | goto parse_error_exitcode1; |
| 6189 | } |
| 6190 | #endif |
| 6191 | if (parse_redirect(&ctx, redir_fd, redir_style, input)) |
| 6192 | goto parse_error_exitcode1; |
| 6193 | continue; /* get next char */ |
Francis Laniel | d8b2563 | 2023-12-22 22:02:38 +0100 | [diff] [blame] | 6194 | #else /* __U_BOOT__ */ |
| 6195 | /* |
| 6196 | * In U-Boot, '<' and '>' can be used in test command to test if |
| 6197 | * a string is, alphabetically, before or after another. |
| 6198 | * In 2021 Busybox hush, we will keep the same behavior and so not treat |
| 6199 | * them as redirection operator. |
| 6200 | * |
| 6201 | * Indeed, in U-Boot, tests are handled by the test command and not by the |
| 6202 | * shell code. |
| 6203 | * So, better to give this character as input to test command. |
| 6204 | * |
| 6205 | * NOTE In my opinion, when you use '<' or '>' I am almost sure |
| 6206 | * you wanted to use "-gt" or "-lt" in place, so thinking to |
| 6207 | * escape these will make you should check your code (sh syntax |
| 6208 | * at this level is, for me, error prone). |
| 6209 | */ |
| 6210 | case '>': |
| 6211 | fallthrough; |
| 6212 | case '<': |
| 6213 | o_addQchr(&ctx.word, ch); |
| 6214 | continue; |
| 6215 | #endif /* __U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 6216 | case '#': |
| 6217 | if (ctx.word.length == 0 && !ctx.word.has_quoted_part) { |
| 6218 | /* skip "#comment" */ |
| 6219 | /* note: we do not add it to &ctx.as_string */ |
| 6220 | /* TODO: in bash: |
| 6221 | * comment inside $() goes to the next \n, even inside quoted string (!): |
| 6222 | * cmd "$(cmd2 #comment)" - syntax error |
| 6223 | * cmd "`cmd2 #comment`" - ok |
| 6224 | * We accept both (comment ends where command subst ends, in both cases). |
| 6225 | */ |
| 6226 | while (1) { |
| 6227 | ch = i_peek(input); |
| 6228 | if (ch == '\n') { |
| 6229 | nommu_addchr(&ctx.as_string, '\n'); |
| 6230 | break; |
| 6231 | } |
| 6232 | ch = i_getch(input); |
| 6233 | if (ch == EOF) |
| 6234 | break; |
| 6235 | } |
| 6236 | continue; /* get next char */ |
| 6237 | } |
| 6238 | break; |
| 6239 | } |
| 6240 | skip_end_trigger: |
| 6241 | |
| 6242 | if (ctx.is_assignment == MAYBE_ASSIGNMENT |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 6243 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 6244 | /* check that we are not in word in "a=1 2>word b=1": */ |
| 6245 | && !ctx.pending_redirect |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 6246 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 6247 | ) { |
| 6248 | /* ch is a special char and thus this word |
| 6249 | * cannot be an assignment */ |
| 6250 | ctx.is_assignment = NOT_ASSIGNMENT; |
| 6251 | debug_printf_parse("ctx.is_assignment='%s'\n", assignment_flag[ctx.is_assignment]); |
| 6252 | } |
| 6253 | |
| 6254 | /* Note: nommu_addchr(&ctx.as_string, ch) is already done */ |
| 6255 | |
| 6256 | switch (ch) { |
| 6257 | case_SPECIAL_VAR_SYMBOL: |
| 6258 | case SPECIAL_VAR_SYMBOL: |
| 6259 | /* Convert raw ^C to corresponding special variable reference */ |
| 6260 | o_addchr(&ctx.word, SPECIAL_VAR_SYMBOL); |
| 6261 | o_addchr(&ctx.word, SPECIAL_VAR_QUOTED_SVS); |
| 6262 | /* fall through */ |
| 6263 | case '#': |
| 6264 | /* non-comment #: "echo a#b" etc */ |
| 6265 | o_addchr(&ctx.word, ch); |
| 6266 | continue; /* get next char */ |
| 6267 | case '$': |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 6268 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 6269 | if (parse_dollar_squote(&ctx.as_string, &ctx.word, input)) |
| 6270 | continue; /* get next char */ |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 6271 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 6272 | if (!parse_dollar(&ctx.as_string, &ctx.word, input, /*quote_mask:*/ 0)) { |
| 6273 | debug_printf_parse("parse_stream parse error: " |
| 6274 | "parse_dollar returned 0 (error)\n"); |
| 6275 | goto parse_error_exitcode1; |
| 6276 | } |
| 6277 | continue; /* get next char */ |
| 6278 | case '"': |
| 6279 | ctx.word.has_quoted_part = 1; |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 6280 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 6281 | if (next == '"' && !ctx.pending_redirect) { |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 6282 | #else /* __U_BOOT__ */ |
| 6283 | if (next == '"') { |
| 6284 | #endif /* __U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 6285 | i_getch(input); /* eat second " */ |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 6286 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 6287 | insert_empty_quoted_str_marker: |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 6288 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 6289 | nommu_addchr(&ctx.as_string, next); |
| 6290 | o_addchr(&ctx.word, SPECIAL_VAR_SYMBOL); |
| 6291 | o_addchr(&ctx.word, SPECIAL_VAR_SYMBOL); |
| 6292 | continue; /* get next char */ |
| 6293 | } |
| 6294 | if (ctx.is_assignment == NOT_ASSIGNMENT) |
| 6295 | ctx.word.o_expflags |= EXP_FLAG_ESC_GLOB_CHARS; |
| 6296 | if (!encode_string(&ctx.as_string, &ctx.word, input, '"')) |
| 6297 | goto parse_error_exitcode1; |
| 6298 | ctx.word.o_expflags &= ~EXP_FLAG_ESC_GLOB_CHARS; |
| 6299 | continue; /* get next char */ |
| 6300 | #if ENABLE_HUSH_TICK |
| 6301 | case '`': { |
| 6302 | USE_FOR_NOMMU(unsigned pos;) |
| 6303 | |
| 6304 | o_addchr(&ctx.word, SPECIAL_VAR_SYMBOL); |
| 6305 | o_addchr(&ctx.word, '`'); |
| 6306 | USE_FOR_NOMMU(pos = ctx.word.length;) |
| 6307 | if (!add_till_backquote(&ctx.word, input, /*in_dquote:*/ 0)) |
| 6308 | goto parse_error_exitcode1; |
| 6309 | # if !BB_MMU |
| 6310 | o_addstr(&ctx.as_string, ctx.word.data + pos); |
| 6311 | o_addchr(&ctx.as_string, '`'); |
| 6312 | # endif |
| 6313 | o_addchr(&ctx.word, SPECIAL_VAR_SYMBOL); |
| 6314 | //debug_printf_subst("SUBST RES3 '%s'\n", ctx.word.data + pos); |
| 6315 | continue; /* get next char */ |
| 6316 | } |
| 6317 | #endif |
| 6318 | case ';': |
| 6319 | #if ENABLE_HUSH_CASE |
| 6320 | case_semi: |
| 6321 | #endif |
| 6322 | if (done_word(&ctx)) { |
| 6323 | goto parse_error_exitcode1; |
| 6324 | } |
| 6325 | done_pipe(&ctx, PIPE_SEQ); |
| 6326 | #if ENABLE_HUSH_CASE |
| 6327 | /* Eat multiple semicolons, detect |
| 6328 | * whether it means something special */ |
| 6329 | while (1) { |
| 6330 | ch = i_peek_and_eat_bkslash_nl(input); |
| 6331 | if (ch != ';') |
| 6332 | break; |
| 6333 | ch = i_getch(input); |
| 6334 | nommu_addchr(&ctx.as_string, ch); |
| 6335 | if (ctx.ctx_res_w == RES_CASE_BODY) { |
| 6336 | ctx.ctx_dsemicolon = 1; |
| 6337 | ctx.ctx_res_w = RES_MATCH; |
| 6338 | break; |
| 6339 | } |
| 6340 | } |
| 6341 | #endif |
| 6342 | new_cmd: |
| 6343 | /* We just finished a cmd. New one may start |
| 6344 | * with an assignment */ |
| 6345 | ctx.is_assignment = MAYBE_ASSIGNMENT; |
| 6346 | debug_printf_parse("ctx.is_assignment='%s'\n", assignment_flag[ctx.is_assignment]); |
| 6347 | continue; /* get next char */ |
| 6348 | case '&': |
| 6349 | if (done_word(&ctx)) { |
| 6350 | goto parse_error_exitcode1; |
| 6351 | } |
| 6352 | if (next == '&') { |
| 6353 | ch = i_getch(input); |
| 6354 | nommu_addchr(&ctx.as_string, ch); |
| 6355 | done_pipe(&ctx, PIPE_AND); |
| 6356 | } else { |
| 6357 | done_pipe(&ctx, PIPE_BG); |
| 6358 | } |
| 6359 | goto new_cmd; |
| 6360 | case '|': |
| 6361 | if (done_word(&ctx)) { |
| 6362 | goto parse_error_exitcode1; |
| 6363 | } |
| 6364 | #if ENABLE_HUSH_CASE |
| 6365 | if (ctx.ctx_res_w == RES_MATCH) |
| 6366 | break; /* we are in case's "word | word)" */ |
| 6367 | #endif |
| 6368 | if (next == '|') { /* || */ |
| 6369 | ch = i_getch(input); |
| 6370 | nommu_addchr(&ctx.as_string, ch); |
| 6371 | done_pipe(&ctx, PIPE_OR); |
| 6372 | } else { |
| 6373 | /* we could pick up a file descriptor choice here |
| 6374 | * with redirect_opt_num(), but bash doesn't do it. |
| 6375 | * "echo foo 2| cat" yields "foo 2". */ |
| 6376 | done_command(&ctx); |
| 6377 | } |
| 6378 | goto new_cmd; |
| 6379 | case '(': |
| 6380 | #if ENABLE_HUSH_CASE |
| 6381 | /* "case... in [(]word)..." - skip '(' */ |
| 6382 | if (ctx.ctx_res_w == RES_MATCH |
| 6383 | && ctx.command->argv == NULL /* not (word|(... */ |
| 6384 | && ctx.word.length == 0 /* not word(... */ |
| 6385 | && ctx.word.has_quoted_part == 0 /* not ""(... */ |
| 6386 | ) { |
| 6387 | continue; /* get next char */ |
| 6388 | } |
| 6389 | #endif |
| 6390 | /* fall through */ |
| 6391 | case '{': { |
| 6392 | int n = parse_group(&ctx, input, ch); |
| 6393 | if (n < 0) { |
| 6394 | goto parse_error_exitcode1; |
| 6395 | } |
| 6396 | debug_printf_heredoc("parse_group done, needs heredocs:%d\n", n); |
| 6397 | heredoc_cnt += n; |
| 6398 | goto new_cmd; |
| 6399 | } |
| 6400 | case ')': |
| 6401 | #if ENABLE_HUSH_CASE |
| 6402 | if (ctx.ctx_res_w == RES_MATCH) |
| 6403 | goto case_semi; |
| 6404 | #endif |
| 6405 | case '}': |
| 6406 | /* proper use of this character is caught by end_trigger: |
| 6407 | * if we see {, we call parse_group(..., end_trigger='}') |
| 6408 | * and it will match } earlier (not here). */ |
| 6409 | G.last_exitcode = 2; |
| 6410 | syntax_error_unexpected_ch(ch); |
| 6411 | goto parse_error; |
| 6412 | default: |
| 6413 | if (HUSH_DEBUG) |
| 6414 | bb_error_msg_and_die("BUG: unexpected %c", ch); |
| 6415 | } |
| 6416 | } /* while (1) */ |
| 6417 | |
| 6418 | parse_error_exitcode1: |
| 6419 | G.last_exitcode = 1; |
| 6420 | parse_error: |
| 6421 | { |
| 6422 | struct parse_context *pctx; |
| 6423 | IF_HAS_KEYWORDS(struct parse_context *p2;) |
| 6424 | |
| 6425 | /* Clean up allocated tree. |
| 6426 | * Sample for finding leaks on syntax error recovery path. |
| 6427 | * Run it from interactive shell, watch pmap `pidof hush`. |
| 6428 | * while if false; then false; fi; do break; fi |
| 6429 | * Samples to catch leaks at execution: |
| 6430 | * while if (true | { true;}); then echo ok; fi; do break; done |
| 6431 | * while if (true | { true;}); then echo ok; fi; do (if echo ok; break; then :; fi) | cat; break; done |
| 6432 | */ |
| 6433 | pctx = &ctx; |
| 6434 | do { |
| 6435 | /* Update pipe/command counts, |
| 6436 | * otherwise freeing may miss some */ |
| 6437 | done_pipe(pctx, PIPE_SEQ); |
| 6438 | debug_printf_clean("freeing list %p from ctx %p\n", |
| 6439 | pctx->list_head, pctx); |
| 6440 | debug_print_tree(pctx->list_head, 0); |
| 6441 | free_pipe_list(pctx->list_head); |
| 6442 | debug_printf_clean("freed list %p\n", pctx->list_head); |
| 6443 | #if !BB_MMU |
| 6444 | o_free(&pctx->as_string); |
| 6445 | #endif |
| 6446 | IF_HAS_KEYWORDS(p2 = pctx->stack;) |
| 6447 | if (pctx != &ctx) { |
| 6448 | free(pctx); |
| 6449 | } |
| 6450 | IF_HAS_KEYWORDS(pctx = p2;) |
| 6451 | } while (HAS_KEYWORDS && pctx); |
| 6452 | |
| 6453 | o_free(&ctx.word); |
| 6454 | #if !BB_MMU |
| 6455 | if (pstring) |
| 6456 | *pstring = NULL; |
| 6457 | #endif |
| 6458 | debug_leave(); |
| 6459 | return ERR_PTR; |
| 6460 | } |
| 6461 | } |
| 6462 | |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 6463 | /*** Execution routines ***/ |
| 6464 | |
| 6465 | /* Expansion can recurse, need forward decls: */ |
| 6466 | #if !BASH_PATTERN_SUBST && !ENABLE_HUSH_CASE |
| 6467 | #define expand_string_to_string(str, EXP_flags, do_unbackslash) \ |
| 6468 | expand_string_to_string(str) |
| 6469 | #endif |
| 6470 | static char *expand_string_to_string(const char *str, int EXP_flags, int do_unbackslash); |
| 6471 | #if ENABLE_HUSH_TICK |
| 6472 | static int process_command_subs(o_string *dest, const char *s); |
| 6473 | #endif |
| 6474 | static int expand_vars_to_list(o_string *output, int n, char *arg); |
| 6475 | |
| 6476 | /* expand_strvec_to_strvec() takes a list of strings, expands |
| 6477 | * all variable references within and returns a pointer to |
| 6478 | * a list of expanded strings, possibly with larger number |
| 6479 | * of strings. (Think VAR="a b"; echo $VAR). |
| 6480 | * This new list is allocated as a single malloc block. |
| 6481 | * NULL-terminated list of char* pointers is at the beginning of it, |
| 6482 | * followed by strings themselves. |
| 6483 | * Caller can deallocate entire list by single free(list). */ |
| 6484 | |
| 6485 | /* A horde of its helpers come first: */ |
| 6486 | |
| 6487 | static void o_addblock_duplicate_backslash(o_string *o, const char *str, int len) |
| 6488 | { |
| 6489 | while (--len >= 0) { |
| 6490 | char c = *str++; |
| 6491 | |
| 6492 | #if ENABLE_HUSH_BRACE_EXPANSION |
| 6493 | if (c == '{' || c == '}') { |
| 6494 | /* { -> \{, } -> \} */ |
| 6495 | o_addchr(o, '\\'); |
| 6496 | /* And now we want to add { or } and continue: |
| 6497 | * o_addchr(o, c); |
| 6498 | * continue; |
| 6499 | * luckily, just falling through achieves this. |
| 6500 | */ |
| 6501 | } |
| 6502 | #endif |
| 6503 | o_addchr(o, c); |
| 6504 | if (c == '\\') { |
| 6505 | /* \z -> \\\z; \<eol> -> \\<eol> */ |
| 6506 | o_addchr(o, '\\'); |
| 6507 | if (len) { |
| 6508 | len--; |
| 6509 | o_addchr(o, '\\'); |
| 6510 | o_addchr(o, *str++); |
| 6511 | } |
| 6512 | } |
| 6513 | } |
| 6514 | } |
| 6515 | |
| 6516 | /* Store given string, finalizing the word and starting new one whenever |
| 6517 | * we encounter IFS char(s). This is used for expanding variable values. |
| 6518 | * End-of-string does NOT finalize word: think about 'echo -$VAR-'. |
| 6519 | * Return in output->ended_in_ifs: |
| 6520 | * 1 - ended with IFS char, else 0 (this includes case of empty str). |
| 6521 | */ |
| 6522 | static int expand_on_ifs(o_string *output, int n, const char *str) |
| 6523 | { |
| 6524 | int last_is_ifs = 0; |
| 6525 | |
| 6526 | while (1) { |
| 6527 | int word_len; |
| 6528 | |
| 6529 | if (!*str) /* EOL - do not finalize word */ |
| 6530 | break; |
| 6531 | word_len = strcspn(str, G.ifs); |
| 6532 | if (word_len) { |
| 6533 | /* We have WORD_LEN leading non-IFS chars */ |
| 6534 | if (!(output->o_expflags & EXP_FLAG_GLOB)) { |
| 6535 | o_addblock(output, str, word_len); |
| 6536 | } else { |
| 6537 | /* Protect backslashes against globbing up :) |
| 6538 | * Example: "v='\*'; echo b$v" prints "b\*" |
| 6539 | * (and does not try to glob on "*") |
| 6540 | */ |
| 6541 | o_addblock_duplicate_backslash(output, str, word_len); |
| 6542 | /*/ Why can't we do it easier? */ |
| 6543 | /*o_addblock(output, str, word_len); - WRONG: "v='\*'; echo Z$v" prints "Z*" instead of "Z\*" */ |
| 6544 | /*o_addqblock(output, str, word_len); - WRONG: "v='*'; echo Z$v" prints "Z*" instead of Z* files */ |
| 6545 | } |
| 6546 | last_is_ifs = 0; |
| 6547 | str += word_len; |
| 6548 | if (!*str) /* EOL - do not finalize word */ |
| 6549 | break; |
| 6550 | } |
| 6551 | |
| 6552 | /* We know str here points to at least one IFS char */ |
| 6553 | last_is_ifs = 1; |
| 6554 | str += strspn(str, G.ifs_whitespace); /* skip IFS whitespace chars */ |
| 6555 | if (!*str) /* EOL - do not finalize word */ |
| 6556 | break; |
| 6557 | |
| 6558 | if (G.ifs_whitespace != G.ifs /* usually false ($IFS is usually all whitespace), */ |
| 6559 | && strchr(G.ifs, *str) /* the second check would fail */ |
| 6560 | ) { |
| 6561 | /* This is a non-whitespace $IFS char */ |
| 6562 | /* Skip it and IFS whitespace chars, start new word */ |
| 6563 | str++; |
| 6564 | str += strspn(str, G.ifs_whitespace); |
| 6565 | goto new_word; |
| 6566 | } |
| 6567 | |
| 6568 | /* Start new word... but not always! */ |
| 6569 | /* Case "v=' a'; echo ''$v": we do need to finalize empty word: */ |
| 6570 | if (output->has_quoted_part |
| 6571 | /* |
| 6572 | * Case "v=' a'; echo $v": |
| 6573 | * here nothing precedes the space in $v expansion, |
| 6574 | * therefore we should not finish the word |
| 6575 | * (IOW: if there *is* word to finalize, only then do it): |
| 6576 | * It's okay if this accesses the byte before first argv[]: |
| 6577 | * past call to o_save_ptr() cleared it to zero byte |
| 6578 | * (grep for -prev-ifs-check-). |
| 6579 | */ |
| 6580 | || output->data[output->length - 1] |
| 6581 | ) { |
| 6582 | new_word: |
| 6583 | o_addchr(output, '\0'); |
| 6584 | debug_print_list("expand_on_ifs", output, n); |
| 6585 | n = o_save_ptr(output, n); |
| 6586 | } |
| 6587 | } |
| 6588 | |
| 6589 | output->ended_in_ifs = last_is_ifs; |
| 6590 | debug_print_list("expand_on_ifs[1]", output, n); |
| 6591 | return n; |
| 6592 | } |
| 6593 | |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 6594 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 6595 | /* Helper to expand $((...)) and heredoc body. These act as if |
| 6596 | * they are in double quotes, with the exception that they are not :). |
| 6597 | * Just the rules are similar: "expand only $var and `cmd`" |
| 6598 | * |
| 6599 | * Returns malloced string. |
| 6600 | * As an optimization, we return NULL if expansion is not needed. |
| 6601 | */ |
| 6602 | static char *encode_then_expand_string(const char *str) |
| 6603 | { |
| 6604 | char *exp_str; |
| 6605 | struct in_str input; |
| 6606 | o_string dest = NULL_O_STRING; |
| 6607 | const char *cp; |
| 6608 | |
| 6609 | cp = str; |
| 6610 | for (;;) { |
| 6611 | if (!*cp) return NULL; /* string has no special chars */ |
| 6612 | if (*cp == '$') break; |
| 6613 | if (*cp == '\\') break; |
| 6614 | #if ENABLE_HUSH_TICK |
| 6615 | if (*cp == '`') break; |
| 6616 | #endif |
| 6617 | cp++; |
| 6618 | } |
| 6619 | |
| 6620 | /* We need to expand. Example: |
| 6621 | * echo $(($a + `echo 1`)) $((1 + $((2)) )) |
| 6622 | */ |
| 6623 | setup_string_in_str(&input, str); |
| 6624 | encode_string(NULL, &dest, &input, EOF); |
| 6625 | //TODO: error check (encode_string returns 0 on error)? |
| 6626 | //bb_error_msg("'%s' -> '%s'", str, dest.data); |
| 6627 | exp_str = expand_string_to_string(dest.data, |
| 6628 | EXP_FLAG_ESC_GLOB_CHARS, |
| 6629 | /*unbackslash:*/ 1 |
| 6630 | ); |
| 6631 | //bb_error_msg("'%s' -> '%s'", dest.data, exp_str); |
| 6632 | o_free(&dest); |
| 6633 | return exp_str; |
| 6634 | } |
| 6635 | |
| 6636 | static const char *first_special_char_in_vararg(const char *cp) |
| 6637 | { |
| 6638 | for (;;) { |
| 6639 | if (!*cp) return NULL; /* string has no special chars */ |
| 6640 | if (*cp == '$') return cp; |
| 6641 | if (*cp == '\\') return cp; |
| 6642 | if (*cp == '\'') return cp; |
| 6643 | if (*cp == '"') return cp; |
| 6644 | #if ENABLE_HUSH_TICK |
| 6645 | if (*cp == '`') return cp; |
| 6646 | #endif |
| 6647 | /* dquoted "${x:+ARG}" should not glob, therefore |
| 6648 | * '*' et al require some non-literal processing: */ |
| 6649 | if (*cp == '*') return cp; |
| 6650 | if (*cp == '?') return cp; |
| 6651 | if (*cp == '[') return cp; |
| 6652 | cp++; |
| 6653 | } |
| 6654 | } |
| 6655 | |
| 6656 | /* Expanding ARG in ${var#ARG}, ${var%ARG}, or ${var/ARG/ARG}. |
| 6657 | * These can contain single- and double-quoted strings, |
| 6658 | * and treated as if the ARG string is initially unquoted. IOW: |
| 6659 | * ${var#ARG} and "${var#ARG}" treat ARG the same (ARG can even be |
| 6660 | * a dquoted string: "${var#"zz"}"), the difference only comes later |
| 6661 | * (word splitting and globbing of the ${var...} result). |
| 6662 | */ |
| 6663 | #if !BASH_PATTERN_SUBST |
| 6664 | #define encode_then_expand_vararg(str, handle_squotes, do_unbackslash) \ |
| 6665 | encode_then_expand_vararg(str, handle_squotes) |
| 6666 | #endif |
| 6667 | static char *encode_then_expand_vararg(const char *str, int handle_squotes, int do_unbackslash) |
| 6668 | { |
| 6669 | #if !BASH_PATTERN_SUBST && ENABLE_HUSH_CASE |
| 6670 | const int do_unbackslash = 0; |
| 6671 | #endif |
| 6672 | char *exp_str; |
| 6673 | struct in_str input; |
| 6674 | o_string dest = NULL_O_STRING; |
| 6675 | |
| 6676 | if (!first_special_char_in_vararg(str)) { |
| 6677 | /* string has no special chars */ |
| 6678 | return NULL; |
| 6679 | } |
| 6680 | |
| 6681 | setup_string_in_str(&input, str); |
| 6682 | dest.data = xzalloc(1); /* start as "", not as NULL */ |
| 6683 | exp_str = NULL; |
| 6684 | |
| 6685 | for (;;) { |
| 6686 | int ch; |
| 6687 | |
| 6688 | ch = i_getch(&input); |
| 6689 | debug_printf_parse("%s: ch=%c (%d) escape=%d\n", |
| 6690 | __func__, ch, ch, !!dest.o_expflags); |
| 6691 | |
| 6692 | if (!dest.o_expflags) { |
| 6693 | if (ch == EOF) |
| 6694 | break; |
| 6695 | if (handle_squotes && ch == '\'') { |
| 6696 | if (!add_till_single_quote_dquoted(&dest, &input)) |
| 6697 | goto ret; /* error */ |
| 6698 | continue; |
| 6699 | } |
| 6700 | } |
| 6701 | if (ch == EOF) { |
| 6702 | syntax_error_unterm_ch('"'); |
| 6703 | goto ret; /* error */ |
| 6704 | } |
| 6705 | if (ch == '"') { |
| 6706 | dest.o_expflags ^= EXP_FLAG_ESC_GLOB_CHARS; |
| 6707 | continue; |
| 6708 | } |
| 6709 | if (ch == '\\') { |
| 6710 | ch = i_getch(&input); |
| 6711 | if (ch == EOF) { |
| 6712 | //example? error message? syntax_error_unterm_ch('"'); |
| 6713 | debug_printf_parse("%s: error: \\<eof>\n", __func__); |
| 6714 | goto ret; |
| 6715 | } |
| 6716 | o_addqchr(&dest, ch); |
| 6717 | continue; |
| 6718 | } |
| 6719 | if (ch == '$') { |
| 6720 | if (parse_dollar_squote(NULL, &dest, &input)) |
| 6721 | continue; |
| 6722 | if (!parse_dollar(NULL, &dest, &input, /*quote_mask:*/ 0x80)) { |
| 6723 | debug_printf_parse("%s: error: parse_dollar returned 0 (error)\n", __func__); |
| 6724 | goto ret; |
| 6725 | } |
| 6726 | continue; |
| 6727 | } |
| 6728 | #if ENABLE_HUSH_TICK |
| 6729 | if (ch == '`') { |
| 6730 | //unsigned pos = dest->length; |
| 6731 | o_addchr(&dest, SPECIAL_VAR_SYMBOL); |
| 6732 | o_addchr(&dest, 0x80 | '`'); |
| 6733 | if (!add_till_backquote(&dest, &input, |
| 6734 | /*in_dquote:*/ dest.o_expflags /* nonzero if EXP_FLAG_ESC_GLOB_CHARS set */ |
| 6735 | ) |
| 6736 | ) { |
| 6737 | goto ret; /* error */ |
| 6738 | } |
| 6739 | o_addchr(&dest, SPECIAL_VAR_SYMBOL); |
| 6740 | //debug_printf_subst("SUBST RES3 '%s'\n", dest->data + pos); |
| 6741 | continue; |
| 6742 | } |
| 6743 | #endif |
| 6744 | o_addQchr(&dest, ch); |
| 6745 | } /* for (;;) */ |
| 6746 | |
| 6747 | debug_printf_parse("encode: '%s' -> '%s'\n", str, dest.data); |
| 6748 | exp_str = expand_string_to_string(dest.data, |
| 6749 | do_unbackslash ? EXP_FLAG_ESC_GLOB_CHARS : 0, |
| 6750 | do_unbackslash |
| 6751 | ); |
| 6752 | ret: |
| 6753 | debug_printf_parse("expand: '%s' -> '%s'\n", dest.data, exp_str); |
| 6754 | o_free(&dest); |
| 6755 | return exp_str; |
| 6756 | } |
| 6757 | |
| 6758 | /* Expanding ARG in ${var+ARG}, ${var-ARG} |
| 6759 | */ |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 6760 | static NOINLINE int encode_then_append_var_plusminus(o_string *output, int n, |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 6761 | char *str, int dquoted) |
| 6762 | { |
| 6763 | struct in_str input; |
| 6764 | o_string dest = NULL_O_STRING; |
| 6765 | |
| 6766 | if (!first_special_char_in_vararg(str) |
| 6767 | && '\0' == str[strcspn(str, G.ifs)] |
| 6768 | ) { |
| 6769 | /* string has no special chars |
| 6770 | * && string has no $IFS chars |
| 6771 | */ |
| 6772 | if (dquoted) { |
| 6773 | /* Prints 1 (quoted expansion is a "" word, not nothing): |
| 6774 | * set -- "${notexist-}"; echo $# |
| 6775 | */ |
| 6776 | output->has_quoted_part = 1; |
| 6777 | } |
| 6778 | return expand_vars_to_list(output, n, str); |
| 6779 | } |
| 6780 | |
| 6781 | setup_string_in_str(&input, str); |
| 6782 | |
| 6783 | for (;;) { |
| 6784 | int ch; |
| 6785 | |
| 6786 | ch = i_getch(&input); |
| 6787 | debug_printf_parse("%s: ch=%c (%d) escape=%x\n", |
| 6788 | __func__, ch, ch, dest.o_expflags); |
| 6789 | |
| 6790 | if (!dest.o_expflags) { |
| 6791 | if (ch == EOF) |
| 6792 | break; |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 6793 | if (!dquoted && !(output->o_expflags & EXP_FLAG_SINGLEWORD) && strchr(G.ifs, ch)) { |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 6794 | /* PREFIX${x:d${e}f ...} and we met space: expand "d${e}f" and start new word. |
| 6795 | * do not assume we are at the start of the word (PREFIX above). |
| 6796 | */ |
| 6797 | if (dest.data) { |
| 6798 | n = expand_vars_to_list(output, n, dest.data); |
| 6799 | o_free_and_set_NULL(&dest); |
| 6800 | o_addchr(output, '\0'); |
| 6801 | n = o_save_ptr(output, n); /* create next word */ |
| 6802 | } else |
| 6803 | if (output->length != o_get_last_ptr(output, n) |
| 6804 | || output->has_quoted_part |
| 6805 | ) { |
| 6806 | /* For these cases: |
| 6807 | * f() { for i; do echo "|$i|"; done; }; x=x |
| 6808 | * f a${x:+ }b # 1st condition |
| 6809 | * |a| |
| 6810 | * |b| |
| 6811 | * f ""${x:+ }b # 2nd condition |
| 6812 | * || |
| 6813 | * |b| |
| 6814 | */ |
| 6815 | o_addchr(output, '\0'); |
| 6816 | n = o_save_ptr(output, n); /* create next word */ |
| 6817 | } |
| 6818 | continue; |
| 6819 | } |
| 6820 | if (!dquoted && ch == '\'') { |
| 6821 | if (!add_till_single_quote_dquoted(&dest, &input)) |
| 6822 | goto ret; /* error */ |
| 6823 | o_addchr(&dest, SPECIAL_VAR_SYMBOL); |
| 6824 | o_addchr(&dest, SPECIAL_VAR_SYMBOL); |
| 6825 | continue; |
| 6826 | } |
| 6827 | } |
| 6828 | if (ch == EOF) { |
| 6829 | syntax_error_unterm_ch('"'); |
| 6830 | goto ret; /* error */ |
| 6831 | } |
| 6832 | if (ch == '"') { |
| 6833 | dest.o_expflags ^= EXP_FLAG_ESC_GLOB_CHARS; |
| 6834 | if (dest.o_expflags) { |
| 6835 | o_addchr(&dest, SPECIAL_VAR_SYMBOL); |
| 6836 | o_addchr(&dest, SPECIAL_VAR_SYMBOL); |
| 6837 | } |
| 6838 | continue; |
| 6839 | } |
| 6840 | if (ch == '\\') { |
| 6841 | ch = i_getch(&input); |
| 6842 | if (ch == EOF) { |
| 6843 | //example? error message? syntax_error_unterm_ch('"'); |
| 6844 | debug_printf_parse("%s: error: \\<eof>\n", __func__); |
| 6845 | goto ret; |
| 6846 | } |
| 6847 | o_addqchr(&dest, ch); |
| 6848 | continue; |
| 6849 | } |
| 6850 | if (ch == '$') { |
| 6851 | if (!parse_dollar(NULL, &dest, &input, /*quote_mask:*/ (dest.o_expflags || dquoted) ? 0x80 : 0)) { |
| 6852 | debug_printf_parse("%s: error: parse_dollar returned 0 (error)\n", __func__); |
| 6853 | goto ret; |
| 6854 | } |
| 6855 | continue; |
| 6856 | } |
| 6857 | #if ENABLE_HUSH_TICK |
| 6858 | if (ch == '`') { |
| 6859 | //unsigned pos = dest->length; |
| 6860 | o_addchr(&dest, SPECIAL_VAR_SYMBOL); |
| 6861 | o_addchr(&dest, (dest.o_expflags || dquoted) ? 0x80 | '`' : '`'); |
| 6862 | if (!add_till_backquote(&dest, &input, |
| 6863 | /*in_dquote:*/ dest.o_expflags /* nonzero if EXP_FLAG_ESC_GLOB_CHARS set */ |
| 6864 | ) |
| 6865 | ) { |
| 6866 | goto ret; /* error */ |
| 6867 | } |
| 6868 | o_addchr(&dest, SPECIAL_VAR_SYMBOL); |
| 6869 | //debug_printf_subst("SUBST RES3 '%s'\n", dest->data + pos); |
| 6870 | continue; |
| 6871 | } |
| 6872 | #endif |
| 6873 | if (dquoted) { |
| 6874 | /* Always glob-protect if in dquotes: |
| 6875 | * x=x; echo "${x:+/bin/c*}" - prints: /bin/c* |
| 6876 | * x=x; echo "${x:+"/bin/c*"}" - prints: /bin/c* |
| 6877 | */ |
| 6878 | o_addqchr(&dest, ch); |
| 6879 | } else { |
| 6880 | /* Glob-protect only if char is quoted: |
| 6881 | * x=x; echo ${x:+/bin/c*} - prints many filenames |
| 6882 | * x=x; echo ${x:+"/bin/c*"} - prints: /bin/c* |
| 6883 | */ |
| 6884 | o_addQchr(&dest, ch); |
| 6885 | } |
| 6886 | } /* for (;;) */ |
| 6887 | |
| 6888 | if (dest.data) { |
| 6889 | n = expand_vars_to_list(output, n, dest.data); |
| 6890 | } |
| 6891 | ret: |
| 6892 | o_free(&dest); |
| 6893 | return n; |
| 6894 | } |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 6895 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 6896 | |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 6897 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 6898 | #if ENABLE_FEATURE_SH_MATH |
| 6899 | static arith_t expand_and_evaluate_arith(const char *arg, const char **errmsg_p) |
| 6900 | { |
| 6901 | arith_state_t math_state; |
| 6902 | arith_t res; |
| 6903 | char *exp_str; |
| 6904 | |
| 6905 | math_state.lookupvar = get_local_var_value; |
| 6906 | math_state.setvar = set_local_var_from_halves; |
| 6907 | //math_state.endofname = endofname; |
| 6908 | exp_str = encode_then_expand_string(arg); |
| 6909 | res = arith(&math_state, exp_str ? exp_str : arg); |
| 6910 | free(exp_str); |
| 6911 | if (errmsg_p) |
| 6912 | *errmsg_p = math_state.errmsg; |
| 6913 | if (math_state.errmsg) |
| 6914 | msg_and_die_if_script(math_state.errmsg); |
| 6915 | return res; |
| 6916 | } |
| 6917 | #endif |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 6918 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 6919 | |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 6920 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 6921 | #if BASH_PATTERN_SUBST |
| 6922 | /* ${var/[/]pattern[/repl]} helpers */ |
| 6923 | static char *strstr_pattern(char *val, const char *pattern, int *size) |
| 6924 | { |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 6925 | int first_escaped = (pattern[0] == '\\' && pattern[1]); |
| 6926 | /* "first_escaped" trick allows to treat e.g. "\*no_glob_chars" |
| 6927 | * as literal too (as it is semi-common, and easy to accomodate |
| 6928 | * by just using str + 1). |
| 6929 | */ |
| 6930 | int sz = strcspn(pattern + first_escaped * 2, "*?[\\"); |
| 6931 | if ((pattern + first_escaped * 2)[sz] == '\0') { |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 6932 | /* Optimization for trivial patterns. |
| 6933 | * Testcase for very slow replace (performs about 22k replaces): |
| 6934 | * x=:::::::::::::::::::::: |
| 6935 | * x=$x$x;x=$x$x;x=$x$x;x=$x$x;x=$x$x;x=$x$x;x=$x$x;x=$x$x;x=$x$x;x=$x$x;echo ${#x} |
| 6936 | * echo "${x//:/|}" |
| 6937 | */ |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 6938 | *size = sz + first_escaped; |
| 6939 | return strstr(val, pattern + first_escaped); |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 6940 | } |
| 6941 | |
| 6942 | while (1) { |
| 6943 | char *end = scan_and_match(val, pattern, SCAN_MOVE_FROM_RIGHT + SCAN_MATCH_LEFT_HALF); |
| 6944 | debug_printf_varexp("val:'%s' pattern:'%s' end:'%s'\n", val, pattern, end); |
| 6945 | if (end) { |
| 6946 | *size = end - val; |
| 6947 | return val; |
| 6948 | } |
| 6949 | if (*val == '\0') |
| 6950 | return NULL; |
| 6951 | /* Optimization: if "*pat" did not match the start of "string", |
| 6952 | * we know that "tring", "ring" etc will not match too: |
| 6953 | */ |
| 6954 | if (pattern[0] == '*') |
| 6955 | return NULL; |
| 6956 | val++; |
| 6957 | } |
| 6958 | } |
| 6959 | static char *replace_pattern(char *val, const char *pattern, const char *repl, char exp_op) |
| 6960 | { |
| 6961 | char *result = NULL; |
| 6962 | unsigned res_len = 0; |
| 6963 | unsigned repl_len = strlen(repl); |
| 6964 | |
| 6965 | /* Null pattern never matches, including if "var" is empty */ |
| 6966 | if (!pattern[0]) |
| 6967 | return result; /* NULL, no replaces happened */ |
| 6968 | |
| 6969 | while (1) { |
| 6970 | int size; |
| 6971 | char *s = strstr_pattern(val, pattern, &size); |
| 6972 | if (!s) |
| 6973 | break; |
| 6974 | |
| 6975 | result = xrealloc(result, res_len + (s - val) + repl_len + 1); |
| 6976 | strcpy(mempcpy(result + res_len, val, s - val), repl); |
| 6977 | res_len += (s - val) + repl_len; |
| 6978 | debug_printf_varexp("val:'%s' s:'%s' result:'%s'\n", val, s, result); |
| 6979 | |
| 6980 | val = s + size; |
| 6981 | if (exp_op == '/') |
| 6982 | break; |
| 6983 | } |
| 6984 | if (*val && result) { |
| 6985 | result = xrealloc(result, res_len + strlen(val) + 1); |
| 6986 | strcpy(result + res_len, val); |
| 6987 | debug_printf_varexp("val:'%s' result:'%s'\n", val, result); |
| 6988 | } |
| 6989 | debug_printf_varexp("result:'%s'\n", result); |
| 6990 | return result; |
| 6991 | } |
| 6992 | #endif /* BASH_PATTERN_SUBST */ |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 6993 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 6994 | |
| 6995 | static int append_str_maybe_ifs_split(o_string *output, int n, |
| 6996 | int first_ch, const char *val) |
| 6997 | { |
| 6998 | if (!(first_ch & 0x80)) { /* unquoted $VAR */ |
| 6999 | debug_printf_expand("unquoted '%s', output->o_escape:%d\n", val, |
| 7000 | !!(output->o_expflags & EXP_FLAG_ESC_GLOB_CHARS)); |
| 7001 | if (val && val[0]) |
| 7002 | n = expand_on_ifs(output, n, val); |
| 7003 | } else { /* quoted "$VAR" */ |
| 7004 | output->has_quoted_part = 1; |
| 7005 | debug_printf_expand("quoted '%s', output->o_escape:%d\n", val, |
| 7006 | !!(output->o_expflags & EXP_FLAG_ESC_GLOB_CHARS)); |
| 7007 | if (val && val[0]) |
| 7008 | o_addQstr(output, val); |
| 7009 | } |
| 7010 | return n; |
| 7011 | } |
| 7012 | |
| 7013 | /* Handle <SPECIAL_VAR_SYMBOL>varname...<SPECIAL_VAR_SYMBOL> construct. |
| 7014 | */ |
| 7015 | static NOINLINE int expand_one_var(o_string *output, int n, |
| 7016 | int first_ch, char *arg, char **pp) |
| 7017 | { |
| 7018 | const char *val; |
| 7019 | char *to_be_freed; |
| 7020 | char *p; |
| 7021 | char *var; |
| 7022 | char exp_op; |
| 7023 | char exp_save = exp_save; /* for compiler */ |
| 7024 | char *exp_saveptr; /* points to expansion operator */ |
| 7025 | char *exp_word = exp_word; /* for compiler */ |
| 7026 | char arg0; |
| 7027 | |
| 7028 | val = NULL; |
| 7029 | to_be_freed = NULL; |
| 7030 | p = *pp; |
| 7031 | *p = '\0'; /* replace trailing SPECIAL_VAR_SYMBOL */ |
| 7032 | var = arg; |
| 7033 | exp_saveptr = arg[1] ? strchr(VAR_ENCODED_SUBST_OPS, arg[1]) : NULL; |
| 7034 | arg0 = arg[0]; |
| 7035 | arg[0] = (arg0 & 0x7f); |
| 7036 | exp_op = 0; |
| 7037 | |
| 7038 | if (arg[0] == '#' && arg[1] /* ${#...} but not ${#} */ |
| 7039 | && (!exp_saveptr /* and ( not(${#<op_char>...}) */ |
| 7040 | || (arg[2] == '\0' && strchr(SPECIAL_VARS_STR, arg[1])) /* or ${#C} "len of $C" ) */ |
| 7041 | ) /* NB: skipping ^^^specvar check mishandles ${#::2} */ |
| 7042 | ) { |
| 7043 | /* It must be length operator: ${#var} */ |
| 7044 | var++; |
| 7045 | exp_op = 'L'; |
| 7046 | } else { |
| 7047 | /* Maybe handle parameter expansion */ |
| 7048 | if (exp_saveptr /* if 2nd char is one of expansion operators */ |
| 7049 | && strchr(NUMERIC_SPECVARS_STR, arg[0]) /* 1st char is special variable */ |
| 7050 | ) { |
| 7051 | /* ${?:0}, ${#[:]%0} etc */ |
| 7052 | exp_saveptr = var + 1; |
| 7053 | } else { |
| 7054 | /* ${?}, ${var}, ${var:0}, ${var[:]%0} etc */ |
| 7055 | exp_saveptr = var+1 + strcspn(var+1, VAR_ENCODED_SUBST_OPS); |
| 7056 | } |
| 7057 | exp_op = exp_save = *exp_saveptr; |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 7058 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 7059 | if (exp_op) { |
| 7060 | exp_word = exp_saveptr + 1; |
| 7061 | if (exp_op == ':') { |
| 7062 | exp_op = *exp_word++; |
| 7063 | //TODO: try ${var:} and ${var:bogus} in non-bash config |
| 7064 | if (BASH_SUBSTR |
| 7065 | && (!exp_op || !strchr(MINUS_PLUS_EQUAL_QUESTION, exp_op)) |
| 7066 | ) { |
| 7067 | /* oops... it's ${var:N[:M]}, not ${var:?xxx} or some such */ |
| 7068 | exp_op = ':'; |
| 7069 | exp_word--; |
| 7070 | } |
| 7071 | } |
| 7072 | *exp_saveptr = '\0'; |
| 7073 | } /* else: it's not an expansion op, but bare ${var} */ |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 7074 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 7075 | } |
| 7076 | |
| 7077 | /* Look up the variable in question */ |
| 7078 | if (isdigit(var[0])) { |
| 7079 | /* parse_dollar should have vetted var for us */ |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 7080 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 7081 | int nn = xatoi_positive(var); |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 7082 | #else /* __U_BOOT__ */ |
| 7083 | int nn = simple_strtoul(var, NULL, 10); |
| 7084 | #endif /* __U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 7085 | if (nn < G.global_argc) |
| 7086 | val = G.global_argv[nn]; |
| 7087 | /* else val remains NULL: $N with too big N */ |
| 7088 | } else { |
| 7089 | switch (var[0]) { |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 7090 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 7091 | case '$': /* pid */ |
| 7092 | val = utoa(G.root_pid); |
| 7093 | break; |
| 7094 | case '!': /* bg pid */ |
| 7095 | val = G.last_bg_pid ? utoa(G.last_bg_pid) : ""; |
| 7096 | break; |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 7097 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 7098 | case '?': /* exitcode */ |
| 7099 | val = utoa(G.last_exitcode); |
| 7100 | break; |
| 7101 | case '#': /* argc */ |
| 7102 | val = utoa(G.global_argc ? G.global_argc-1 : 0); |
| 7103 | break; |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 7104 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 7105 | case '-': { /* active options */ |
| 7106 | /* Check set_mode() to see what option chars we support */ |
| 7107 | char *cp; |
| 7108 | val = cp = G.optstring_buf; |
| 7109 | if (G.o_opt[OPT_O_ERREXIT]) |
| 7110 | *cp++ = 'e'; |
| 7111 | if (G_interactive_fd) |
| 7112 | *cp++ = 'i'; |
| 7113 | if (G_x_mode) |
| 7114 | *cp++ = 'x'; |
| 7115 | /* If G.o_opt[OPT_O_NOEXEC] is true, |
| 7116 | * commands read but are not executed, |
| 7117 | * so $- can not execute too, 'n' is never seen in $-. |
| 7118 | */ |
| 7119 | if (G.opt_c) |
| 7120 | *cp++ = 'c'; |
| 7121 | if (G.opt_s) |
| 7122 | *cp++ = 's'; |
| 7123 | *cp = '\0'; |
| 7124 | break; |
| 7125 | } |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 7126 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 7127 | default: |
Francis Laniel | 74e4254 | 2023-12-22 22:02:33 +0100 | [diff] [blame] | 7128 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 7129 | val = get_local_var_value(var); |
Francis Laniel | 74e4254 | 2023-12-22 22:02:33 +0100 | [diff] [blame] | 7130 | #else /* __U_BOOT__ */ |
| 7131 | /* |
| 7132 | * Environment variable set with setenv* have to be |
| 7133 | * expanded. |
| 7134 | * So, we first search if the variable exists in |
| 7135 | * environment, if this is not the case, we default to |
| 7136 | * local value. |
| 7137 | */ |
| 7138 | val = env_get(var); |
| 7139 | if (!val) |
| 7140 | val = get_local_var_value(var); |
| 7141 | #endif /* __U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 7142 | } |
| 7143 | } |
| 7144 | |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 7145 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 7146 | /* Handle any expansions */ |
| 7147 | if (exp_op == 'L') { |
| 7148 | reinit_unicode_for_hush(); |
| 7149 | debug_printf_expand("expand: length(%s)=", val); |
| 7150 | val = utoa(val ? unicode_strlen(val) : 0); |
| 7151 | debug_printf_expand("%s\n", val); |
| 7152 | } else if (exp_op) { |
| 7153 | if (exp_op == '%' || exp_op == '#') { |
| 7154 | /* Standard-mandated substring removal ops: |
| 7155 | * ${parameter%word} - remove smallest suffix pattern |
| 7156 | * ${parameter%%word} - remove largest suffix pattern |
| 7157 | * ${parameter#word} - remove smallest prefix pattern |
| 7158 | * ${parameter##word} - remove largest prefix pattern |
| 7159 | * |
| 7160 | * Word is expanded to produce a glob pattern. |
| 7161 | * Then var's value is matched to it and matching part removed. |
| 7162 | */ |
| 7163 | /* bash compat: if x is "" and no shrinking of it is possible, |
| 7164 | * inner ${...} is not evaluated. Example: |
| 7165 | * unset b; : ${a%${b=B}}; echo $b |
| 7166 | * assignment b=B only happens if $a is not "". |
| 7167 | */ |
| 7168 | if (val && val[0]) { |
| 7169 | char *t; |
| 7170 | char *exp_exp_word; |
| 7171 | char *loc; |
| 7172 | unsigned scan_flags = pick_scan(exp_op, *exp_word); |
| 7173 | if (exp_op == *exp_word) /* ## or %% */ |
| 7174 | exp_word++; |
| 7175 | debug_printf_expand("expand: exp_word:'%s'\n", exp_word); |
| 7176 | exp_exp_word = encode_then_expand_vararg(exp_word, /*handle_squotes:*/ 1, /*unbackslash:*/ 0); |
| 7177 | if (exp_exp_word) |
| 7178 | exp_word = exp_exp_word; |
| 7179 | debug_printf_expand("expand: exp_word:'%s'\n", exp_word); |
| 7180 | /* |
| 7181 | * HACK ALERT. We depend here on the fact that |
| 7182 | * G.global_argv and results of utoa and get_local_var_value |
| 7183 | * are actually in writable memory: |
| 7184 | * scan_and_match momentarily stores NULs there. |
| 7185 | */ |
| 7186 | t = (char*)val; |
| 7187 | loc = scan_and_match(t, exp_word, scan_flags); |
| 7188 | debug_printf_expand("op:%c str:'%s' pat:'%s' res:'%s'\n", exp_op, t, exp_word, loc); |
| 7189 | free(exp_exp_word); |
| 7190 | if (loc) { /* match was found */ |
| 7191 | if (scan_flags & SCAN_MATCH_LEFT_HALF) /* #[#] */ |
| 7192 | val = loc; /* take right part */ |
| 7193 | else /* %[%] */ |
| 7194 | val = to_be_freed = xstrndup(val, loc - val); /* left */ |
| 7195 | } |
| 7196 | } |
| 7197 | } |
| 7198 | #if BASH_PATTERN_SUBST |
| 7199 | else if (exp_op == '/' || exp_op == '\\') { |
| 7200 | /* It's ${var/[/]pattern[/repl]} thing. |
| 7201 | * Note that in encoded form it has TWO parts: |
| 7202 | * var/pattern<SPECIAL_VAR_SYMBOL>repl<SPECIAL_VAR_SYMBOL> |
| 7203 | * and if // is used, it is encoded as \: |
| 7204 | * var\pattern<SPECIAL_VAR_SYMBOL>repl<SPECIAL_VAR_SYMBOL> |
| 7205 | */ |
| 7206 | /* bash compat: if var is "", both pattern and repl |
| 7207 | * are still evaluated, if it is unset, then not: |
| 7208 | * unset b; a=; : ${a/z/${b=3}}; echo $b # b=3 |
| 7209 | * unset b; unset a; : ${a/z/${b=3}}; echo $b # b not set |
| 7210 | */ |
| 7211 | if (val /*&& val[0]*/) { |
| 7212 | /* pattern uses non-standard expansion. |
| 7213 | * repl should be unbackslashed and globbed |
| 7214 | * by the usual expansion rules: |
| 7215 | * >az >bz |
| 7216 | * v='a bz'; echo "${v/a*z/a*z}" #prints "a*z" |
| 7217 | * v='a bz'; echo "${v/a*z/\z}" #prints "z" |
| 7218 | * v='a bz'; echo ${v/a*z/a*z} #prints "az" |
| 7219 | * v='a bz'; echo ${v/a*z/\z} #prints "z" |
| 7220 | * (note that a*z _pattern_ is never globbed!) |
| 7221 | */ |
| 7222 | char *pattern, *repl, *t; |
| 7223 | pattern = encode_then_expand_vararg(exp_word, /*handle_squotes:*/ 1, /*unbackslash:*/ 0); |
| 7224 | if (!pattern) |
| 7225 | pattern = xstrdup(exp_word); |
| 7226 | debug_printf_varexp("pattern:'%s'->'%s'\n", exp_word, pattern); |
| 7227 | *p++ = SPECIAL_VAR_SYMBOL; |
| 7228 | exp_word = p; |
| 7229 | p = strchr(p, SPECIAL_VAR_SYMBOL); |
| 7230 | *p = '\0'; |
| 7231 | repl = encode_then_expand_vararg(exp_word, /*handle_squotes:*/ 1, /*unbackslash:*/ 1); |
| 7232 | debug_printf_varexp("repl:'%s'->'%s'\n", exp_word, repl); |
| 7233 | /* HACK ALERT. We depend here on the fact that |
| 7234 | * G.global_argv and results of utoa and get_local_var_value |
| 7235 | * are actually in writable memory: |
| 7236 | * replace_pattern momentarily stores NULs there. */ |
| 7237 | t = (char*)val; |
| 7238 | to_be_freed = replace_pattern(t, |
| 7239 | pattern, |
| 7240 | (repl ? repl : exp_word), |
| 7241 | exp_op); |
| 7242 | if (to_be_freed) /* at least one replace happened */ |
| 7243 | val = to_be_freed; |
| 7244 | free(pattern); |
| 7245 | free(repl); |
| 7246 | } else { |
| 7247 | /* Unset variable always gives nothing */ |
| 7248 | // a=; echo ${a/*/w} # "w" |
| 7249 | // unset a; echo ${a/*/w} # "" |
| 7250 | /* Just skip "replace" part */ |
| 7251 | *p++ = SPECIAL_VAR_SYMBOL; |
| 7252 | p = strchr(p, SPECIAL_VAR_SYMBOL); |
| 7253 | *p = '\0'; |
| 7254 | } |
| 7255 | } |
| 7256 | #endif /* BASH_PATTERN_SUBST */ |
| 7257 | else if (exp_op == ':') { |
| 7258 | #if BASH_SUBSTR && ENABLE_FEATURE_SH_MATH |
| 7259 | /* It's ${var:N[:M]} bashism. |
| 7260 | * Note that in encoded form it has TWO parts: |
| 7261 | * var:N<SPECIAL_VAR_SYMBOL>M<SPECIAL_VAR_SYMBOL> |
| 7262 | */ |
| 7263 | arith_t beg, len; |
| 7264 | unsigned vallen; |
| 7265 | const char *errmsg; |
| 7266 | |
| 7267 | beg = expand_and_evaluate_arith(exp_word, &errmsg); |
| 7268 | if (errmsg) |
| 7269 | goto empty_result; |
| 7270 | debug_printf_varexp("beg:'%s'=%lld\n", exp_word, (long long)beg); |
| 7271 | *p++ = SPECIAL_VAR_SYMBOL; |
| 7272 | exp_word = p; |
| 7273 | p = strchr(p, SPECIAL_VAR_SYMBOL); |
| 7274 | *p = '\0'; |
| 7275 | vallen = val ? strlen(val) : 0; |
| 7276 | if (beg < 0) { |
| 7277 | /* negative beg counts from the end */ |
| 7278 | beg = (arith_t)vallen + beg; |
| 7279 | } |
| 7280 | /* If expansion will be empty, do not even evaluate len */ |
| 7281 | if (!val || beg < 0 || beg > vallen) { |
| 7282 | /* Why > vallen, not >=? bash: |
| 7283 | * unset b; a=ab; : ${a:2:${b=3}}; echo $b # "", b=3 (!!!) |
| 7284 | * unset b; a=a; : ${a:2:${b=3}}; echo $b # "", b not set |
| 7285 | */ |
| 7286 | goto empty_result; |
| 7287 | } |
| 7288 | len = expand_and_evaluate_arith(exp_word, &errmsg); |
| 7289 | if (errmsg) |
| 7290 | goto empty_result; |
| 7291 | debug_printf_varexp("len:'%s'=%lld\n", exp_word, (long long)len); |
| 7292 | debug_printf_varexp("from val:'%s'\n", val); |
| 7293 | if (len < 0) { |
| 7294 | /* in bash, len=-n means strlen()-n */ |
| 7295 | len = (arith_t)vallen - beg + len; |
| 7296 | if (len < 0) /* bash compat */ |
| 7297 | msg_and_die_if_script("%s: substring expression < 0", var); |
| 7298 | } |
| 7299 | if (len <= 0 || !val /*|| beg >= vallen*/) { |
| 7300 | empty_result: |
| 7301 | val = NULL; |
| 7302 | } else { |
| 7303 | /* Paranoia. What if user entered 9999999999999 |
| 7304 | * which fits in arith_t but not int? */ |
| 7305 | if (len > INT_MAX) |
| 7306 | len = INT_MAX; |
| 7307 | val = to_be_freed = xstrndup(val + beg, len); |
| 7308 | } |
| 7309 | debug_printf_varexp("val:'%s'\n", val); |
| 7310 | #else /* not (HUSH_SUBSTR_EXPANSION && FEATURE_SH_MATH) */ |
| 7311 | msg_and_die_if_script("malformed ${%s:...}", var); |
| 7312 | val = NULL; |
| 7313 | #endif |
| 7314 | } else { /* one of "-=+?" */ |
| 7315 | /* Standard-mandated substitution ops: |
| 7316 | * ${var?word} - indicate error if unset |
| 7317 | * If var is unset, word (or a message indicating it is unset |
| 7318 | * if word is null) is written to standard error |
| 7319 | * and the shell exits with a non-zero exit status. |
| 7320 | * Otherwise, the value of var is substituted. |
| 7321 | * ${var-word} - use default value |
| 7322 | * If var is unset, word is substituted. |
| 7323 | * ${var=word} - assign and use default value |
| 7324 | * If var is unset, word is assigned to var. |
| 7325 | * In all cases, final value of var is substituted. |
| 7326 | * ${var+word} - use alternative value |
| 7327 | * If var is unset, null is substituted. |
| 7328 | * Otherwise, word is substituted. |
| 7329 | * |
| 7330 | * Word is subjected to tilde expansion, parameter expansion, |
| 7331 | * command substitution, and arithmetic expansion. |
| 7332 | * If word is not needed, it is not expanded. |
| 7333 | * |
| 7334 | * Colon forms (${var:-word}, ${var:=word} etc) do the same, |
| 7335 | * but also treat null var as if it is unset. |
| 7336 | * |
| 7337 | * Word-splitting and single quote behavior: |
| 7338 | * |
| 7339 | * $ f() { for i; do echo "|$i|"; done; } |
| 7340 | * |
| 7341 | * $ x=; f ${x:?'x y' z}; echo $? |
| 7342 | * bash: x: x y z # neither f nor "echo $?" executes |
| 7343 | * (if interactive, bash does not exit, but merely aborts to prompt. $? is set to 1) |
| 7344 | * $ x=; f "${x:?'x y' z}" |
| 7345 | * bash: x: x y z # dash prints: dash: x: 'x y' z |
| 7346 | * |
| 7347 | * $ x=; f ${x:='x y' z} |
| 7348 | * |x| |
| 7349 | * |y| |
| 7350 | * |z| |
| 7351 | * $ x=; f "${x:='x y' z}" |
| 7352 | * |'x y' z| |
| 7353 | * |
| 7354 | * $ x=x; f ${x:+'x y' z} |
| 7355 | * |x y| |
| 7356 | * |z| |
| 7357 | * $ x=x; f "${x:+'x y' z}" |
| 7358 | * |'x y' z| |
| 7359 | * |
| 7360 | * $ x=; f ${x:-'x y' z} |
| 7361 | * |x y| |
| 7362 | * |z| |
| 7363 | * $ x=; f "${x:-'x y' z}" |
| 7364 | * |'x y' z| |
| 7365 | */ |
| 7366 | int use_word = (!val || ((exp_save == ':') && !val[0])); |
| 7367 | if (exp_op == '+') |
| 7368 | use_word = !use_word; |
| 7369 | debug_printf_expand("expand: op:%c (null:%s) test:%i\n", exp_op, |
| 7370 | (exp_save == ':') ? "true" : "false", use_word); |
| 7371 | if (use_word) { |
| 7372 | if (exp_op == '+' || exp_op == '-') { |
| 7373 | /* ${var+word} - use alternative value */ |
| 7374 | /* ${var-word} - use default value */ |
| 7375 | n = encode_then_append_var_plusminus(output, n, exp_word, |
| 7376 | /*dquoted:*/ (arg0 & 0x80) |
| 7377 | ); |
| 7378 | val = NULL; |
| 7379 | } else { |
| 7380 | /* ${var?word} - indicate error if unset */ |
| 7381 | /* ${var=word} - assign and use default value */ |
| 7382 | to_be_freed = encode_then_expand_vararg(exp_word, |
| 7383 | /*handle_squotes:*/ !(arg0 & 0x80), |
| 7384 | /*unbackslash:*/ 0 |
| 7385 | ); |
| 7386 | if (to_be_freed) |
| 7387 | exp_word = to_be_freed; |
| 7388 | if (exp_op == '?') { |
| 7389 | /* mimic bash message */ |
| 7390 | msg_and_die_if_script("%s: %s", |
| 7391 | var, |
| 7392 | exp_word[0] |
| 7393 | ? exp_word |
| 7394 | : "parameter null or not set" |
| 7395 | /* ash has more specific messages, a-la: */ |
| 7396 | /*: (exp_save == ':' ? "parameter null or not set" : "parameter not set")*/ |
| 7397 | ); |
| 7398 | //TODO: how interactive bash aborts expansion mid-command? |
| 7399 | //It aborts the entire line, returns to prompt: |
| 7400 | // $ f() { for i; do echo "|$i|"; done; }; x=; f "${x:?'x y' z}"; echo YO |
| 7401 | // bash: x: x y z |
| 7402 | // $ |
| 7403 | // ("echo YO" is not executed, neither the f function call) |
| 7404 | } else { |
| 7405 | val = exp_word; |
| 7406 | } |
| 7407 | if (exp_op == '=') { |
| 7408 | /* ${var=[word]} or ${var:=[word]} */ |
| 7409 | if (isdigit(var[0]) || var[0] == '#') { |
| 7410 | /* mimic bash message */ |
| 7411 | msg_and_die_if_script("$%s: cannot assign in this way", var); |
| 7412 | val = NULL; |
| 7413 | } else { |
| 7414 | char *new_var = xasprintf("%s=%s", var, val); |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 7415 | set_local_var0(new_var); |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 7416 | } |
| 7417 | } |
| 7418 | } |
| 7419 | } |
| 7420 | } /* one of "-=+?" */ |
| 7421 | |
| 7422 | *exp_saveptr = exp_save; |
| 7423 | } /* if (exp_op) */ |
| 7424 | |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 7425 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 7426 | arg[0] = arg0; |
| 7427 | *pp = p; |
| 7428 | |
| 7429 | n = append_str_maybe_ifs_split(output, n, first_ch, val); |
| 7430 | |
| 7431 | free(to_be_freed); |
| 7432 | return n; |
| 7433 | } |
| 7434 | |
| 7435 | /* Expand all variable references in given string, adding words to list[] |
| 7436 | * at n, n+1,... positions. Return updated n (so that list[n] is next one |
| 7437 | * to be filled). This routine is extremely tricky: has to deal with |
| 7438 | * variables/parameters with whitespace, $* and $@, and constructs like |
| 7439 | * 'echo -$*-'. If you play here, you must run testsuite afterwards! */ |
| 7440 | static NOINLINE int expand_vars_to_list(o_string *output, int n, char *arg) |
| 7441 | { |
| 7442 | /* output->o_expflags & EXP_FLAG_SINGLEWORD (0x80) if we are in |
| 7443 | * expansion of right-hand side of assignment == 1-element expand. |
| 7444 | */ |
| 7445 | char cant_be_null = 0; /* only bit 0x80 matters */ |
| 7446 | char *p; |
| 7447 | |
| 7448 | debug_printf_expand("expand_vars_to_list: arg:'%s' singleword:%x\n", arg, |
| 7449 | !!(output->o_expflags & EXP_FLAG_SINGLEWORD)); |
| 7450 | debug_print_list("expand_vars_to_list[0]", output, n); |
| 7451 | |
| 7452 | while ((p = strchr(arg, SPECIAL_VAR_SYMBOL)) != NULL) { |
| 7453 | char first_ch; |
| 7454 | #if ENABLE_FEATURE_SH_MATH |
| 7455 | char arith_buf[sizeof(arith_t)*3 + 2]; |
| 7456 | #endif |
| 7457 | |
| 7458 | if (output->ended_in_ifs) { |
| 7459 | o_addchr(output, '\0'); |
| 7460 | n = o_save_ptr(output, n); |
| 7461 | output->ended_in_ifs = 0; |
| 7462 | } |
| 7463 | |
| 7464 | o_addblock(output, arg, p - arg); |
| 7465 | debug_print_list("expand_vars_to_list[1]", output, n); |
| 7466 | arg = ++p; |
| 7467 | p = strchr(p, SPECIAL_VAR_SYMBOL); |
| 7468 | |
| 7469 | /* Fetch special var name (if it is indeed one of them) |
| 7470 | * and quote bit, force the bit on if singleword expansion - |
| 7471 | * important for not getting v=$@ expand to many words. */ |
| 7472 | first_ch = arg[0] | (output->o_expflags & EXP_FLAG_SINGLEWORD); |
| 7473 | |
| 7474 | /* Is this variable quoted and thus expansion can't be null? |
| 7475 | * "$@" is special. Even if quoted, it can still |
| 7476 | * expand to nothing (not even an empty string), |
| 7477 | * thus it is excluded. */ |
| 7478 | if ((first_ch & 0x7f) != '@') |
| 7479 | cant_be_null |= first_ch; |
| 7480 | |
| 7481 | switch (first_ch & 0x7f) { |
| 7482 | /* Highest bit in first_ch indicates that var is double-quoted */ |
| 7483 | case '*': |
| 7484 | case '@': { |
| 7485 | int i; |
Francis Laniel | 74e4254 | 2023-12-22 22:02:33 +0100 | [diff] [blame] | 7486 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 7487 | if (!G.global_argv[1]) |
Francis Laniel | 74e4254 | 2023-12-22 22:02:33 +0100 | [diff] [blame] | 7488 | #else /* __U_BOOT__ */ |
| 7489 | if (!G.global_argv || !G.global_argv[1]) |
| 7490 | #endif /* __U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 7491 | break; |
| 7492 | i = 1; |
| 7493 | cant_be_null |= first_ch; /* do it for "$@" _now_, when we know it's not empty */ |
| 7494 | if (!(first_ch & 0x80)) { /* unquoted $* or $@ */ |
| 7495 | while (G.global_argv[i]) { |
| 7496 | n = expand_on_ifs(output, n, G.global_argv[i]); |
| 7497 | debug_printf_expand("expand_vars_to_list: argv %d (last %d)\n", i, G.global_argc - 1); |
| 7498 | if (G.global_argv[i++][0] && G.global_argv[i]) { |
| 7499 | /* this argv[] is not empty and not last: |
| 7500 | * put terminating NUL, start new word */ |
| 7501 | o_addchr(output, '\0'); |
| 7502 | debug_print_list("expand_vars_to_list[2]", output, n); |
| 7503 | n = o_save_ptr(output, n); |
| 7504 | debug_print_list("expand_vars_to_list[3]", output, n); |
| 7505 | } |
| 7506 | } |
| 7507 | } else |
| 7508 | /* If EXP_FLAG_SINGLEWORD, we handle assignment 'a=....$@.....' |
| 7509 | * and in this case should treat it like '$*' - see 'else...' below */ |
| 7510 | if (first_ch == (char)('@'|0x80) /* quoted $@ */ |
| 7511 | && !(output->o_expflags & EXP_FLAG_SINGLEWORD) /* not v="$@" case */ |
| 7512 | ) { |
| 7513 | while (1) { |
| 7514 | o_addQstr(output, G.global_argv[i]); |
| 7515 | if (++i >= G.global_argc) |
| 7516 | break; |
| 7517 | o_addchr(output, '\0'); |
| 7518 | debug_print_list("expand_vars_to_list[4]", output, n); |
| 7519 | n = o_save_ptr(output, n); |
| 7520 | } |
| 7521 | } else { /* quoted $* (or v="$@" case): add as one word */ |
| 7522 | while (1) { |
| 7523 | o_addQstr(output, G.global_argv[i]); |
| 7524 | if (!G.global_argv[++i]) |
| 7525 | break; |
| 7526 | if (G.ifs[0]) |
| 7527 | o_addchr(output, G.ifs[0]); |
| 7528 | } |
| 7529 | output->has_quoted_part = 1; |
| 7530 | } |
| 7531 | break; |
| 7532 | } |
| 7533 | case SPECIAL_VAR_SYMBOL: { |
| 7534 | /* <SPECIAL_VAR_SYMBOL><SPECIAL_VAR_SYMBOL> */ |
| 7535 | /* "Empty variable", used to make "" etc to not disappear */ |
| 7536 | output->has_quoted_part = 1; |
| 7537 | cant_be_null = 0x80; |
| 7538 | arg++; |
| 7539 | break; |
| 7540 | } |
| 7541 | case SPECIAL_VAR_QUOTED_SVS: |
| 7542 | /* <SPECIAL_VAR_SYMBOL><SPECIAL_VAR_QUOTED_SVS><SPECIAL_VAR_SYMBOL> */ |
| 7543 | /* "^C variable", represents literal ^C char (possible in scripts) */ |
| 7544 | o_addchr(output, SPECIAL_VAR_SYMBOL); |
| 7545 | arg++; |
| 7546 | break; |
| 7547 | #if ENABLE_HUSH_TICK |
| 7548 | case '`': { |
| 7549 | /* <SPECIAL_VAR_SYMBOL>`cmd<SPECIAL_VAR_SYMBOL> */ |
| 7550 | o_string subst_result = NULL_O_STRING; |
| 7551 | |
| 7552 | *p = '\0'; /* replace trailing <SPECIAL_VAR_SYMBOL> */ |
| 7553 | arg++; |
| 7554 | /* Can't just stuff it into output o_string, |
| 7555 | * expanded result may need to be globbed |
| 7556 | * and $IFS-split */ |
| 7557 | debug_printf_subst("SUBST '%s' first_ch %x\n", arg, first_ch); |
| 7558 | G.last_exitcode = process_command_subs(&subst_result, arg); |
| 7559 | G.expand_exitcode = G.last_exitcode; |
| 7560 | debug_printf_subst("SUBST RES:%d '%s'\n", G.last_exitcode, subst_result.data); |
| 7561 | n = append_str_maybe_ifs_split(output, n, first_ch, subst_result.data); |
| 7562 | o_free(&subst_result); |
| 7563 | break; |
| 7564 | } |
| 7565 | #endif |
| 7566 | #if ENABLE_FEATURE_SH_MATH |
| 7567 | case '+': { |
| 7568 | /* <SPECIAL_VAR_SYMBOL>+arith<SPECIAL_VAR_SYMBOL> */ |
| 7569 | arith_t res; |
| 7570 | |
| 7571 | arg++; /* skip '+' */ |
| 7572 | *p = '\0'; /* replace trailing <SPECIAL_VAR_SYMBOL> */ |
| 7573 | debug_printf_subst("ARITH '%s' first_ch %x\n", arg, first_ch); |
| 7574 | res = expand_and_evaluate_arith(arg, NULL); |
| 7575 | debug_printf_subst("ARITH RES '"ARITH_FMT"'\n", res); |
| 7576 | sprintf(arith_buf, ARITH_FMT, res); |
| 7577 | if (res < 0 |
| 7578 | && first_ch == (char)('+'|0x80) |
| 7579 | /* && (output->o_expflags & EXP_FLAG_ESC_GLOB_CHARS) */ |
| 7580 | ) { |
| 7581 | /* Quoted negative ariths, like filename[0"$((-9))"], |
| 7582 | * should not be interpreted as glob ranges. |
| 7583 | * Convert leading '-' to '\-': |
| 7584 | */ |
| 7585 | o_grow_by(output, 1); |
| 7586 | output->data[output->length++] = '\\'; |
| 7587 | } |
| 7588 | o_addstr(output, arith_buf); |
| 7589 | break; |
| 7590 | } |
| 7591 | #endif |
| 7592 | default: |
| 7593 | /* <SPECIAL_VAR_SYMBOL>varname[ops]<SPECIAL_VAR_SYMBOL> */ |
| 7594 | n = expand_one_var(output, n, first_ch, arg, &p); |
| 7595 | break; |
| 7596 | } /* switch (char after <SPECIAL_VAR_SYMBOL>) */ |
| 7597 | |
| 7598 | /* Restore NULL'ed SPECIAL_VAR_SYMBOL. |
| 7599 | * Do the check to avoid writing to a const string. */ |
| 7600 | if (*p != SPECIAL_VAR_SYMBOL) |
| 7601 | *p = SPECIAL_VAR_SYMBOL; |
| 7602 | arg = ++p; |
| 7603 | } /* end of "while (SPECIAL_VAR_SYMBOL is found) ..." */ |
| 7604 | |
| 7605 | if (*arg) { |
| 7606 | /* handle trailing string */ |
| 7607 | if (output->ended_in_ifs) { |
| 7608 | o_addchr(output, '\0'); |
| 7609 | n = o_save_ptr(output, n); |
| 7610 | } |
| 7611 | debug_print_list("expand_vars_to_list[a]", output, n); |
| 7612 | /* this part is literal, and it was already pre-quoted |
| 7613 | * if needed (much earlier), do not use o_addQstr here! |
| 7614 | */ |
| 7615 | o_addstr(output, arg); |
| 7616 | debug_print_list("expand_vars_to_list[b]", output, n); |
| 7617 | } else |
| 7618 | if (output->length == o_get_last_ptr(output, n) /* expansion is empty */ |
| 7619 | && !(cant_be_null & 0x80) /* and all vars were not quoted */ |
| 7620 | && !output->has_quoted_part |
| 7621 | ) { |
| 7622 | n--; |
| 7623 | /* allow to reuse list[n] later without re-growth */ |
| 7624 | output->has_empty_slot = 1; |
| 7625 | } |
| 7626 | |
| 7627 | return n; |
| 7628 | } |
| 7629 | |
| 7630 | static char **expand_variables(char **argv, unsigned expflags) |
| 7631 | { |
| 7632 | int n; |
| 7633 | char **list; |
| 7634 | o_string output = NULL_O_STRING; |
| 7635 | |
| 7636 | output.o_expflags = expflags; |
| 7637 | |
| 7638 | n = 0; |
| 7639 | for (;;) { |
| 7640 | /* go to next list[n] */ |
| 7641 | output.ended_in_ifs = 0; |
| 7642 | n = o_save_ptr(&output, n); |
| 7643 | |
| 7644 | if (!*argv) |
| 7645 | break; |
| 7646 | |
| 7647 | /* expand argv[i] */ |
| 7648 | n = expand_vars_to_list(&output, n, *argv++); |
| 7649 | /* if (!output->has_empty_slot) -- need this?? */ |
| 7650 | o_addchr(&output, '\0'); |
| 7651 | } |
| 7652 | debug_print_list("expand_variables", &output, n); |
| 7653 | |
| 7654 | /* output.data (malloced in one block) gets returned in "list" */ |
| 7655 | list = o_finalize_list(&output, n); |
| 7656 | debug_print_strings("expand_variables[1]", list); |
| 7657 | return list; |
| 7658 | } |
| 7659 | |
| 7660 | static char **expand_strvec_to_strvec(char **argv) |
| 7661 | { |
| 7662 | return expand_variables(argv, EXP_FLAG_GLOB | EXP_FLAG_ESC_GLOB_CHARS); |
| 7663 | } |
| 7664 | |
| 7665 | #if defined(CMD_SINGLEWORD_NOGLOB) || defined(CMD_TEST2_SINGLEWORD_NOGLOB) |
| 7666 | static char **expand_strvec_to_strvec_singleword_noglob(char **argv) |
| 7667 | { |
| 7668 | return expand_variables(argv, EXP_FLAG_SINGLEWORD); |
| 7669 | } |
| 7670 | #endif |
| 7671 | |
| 7672 | /* Used for expansion of right hand of assignments, |
| 7673 | * $((...)), heredocs, variable expansion parts. |
| 7674 | * |
| 7675 | * NB: should NOT do globbing! |
| 7676 | * "export v=/bin/c*; env | grep ^v=" outputs "v=/bin/c*" |
| 7677 | */ |
| 7678 | static char *expand_string_to_string(const char *str, int EXP_flags, int do_unbackslash) |
| 7679 | { |
| 7680 | #if !BASH_PATTERN_SUBST && !ENABLE_HUSH_CASE |
| 7681 | const int do_unbackslash = 1; |
| 7682 | const int EXP_flags = EXP_FLAG_ESC_GLOB_CHARS; |
| 7683 | #endif |
| 7684 | char *argv[2], **list; |
| 7685 | |
| 7686 | debug_printf_expand("string_to_string<='%s'\n", str); |
| 7687 | /* This is generally an optimization, but it also |
| 7688 | * handles "", which otherwise trips over !list[0] check below. |
| 7689 | * (is this ever happens that we actually get str="" here?) |
| 7690 | */ |
| 7691 | if (!strchr(str, SPECIAL_VAR_SYMBOL) && !strchr(str, '\\')) { |
| 7692 | //TODO: Can use on strings with \ too, just unbackslash() them? |
| 7693 | debug_printf_expand("string_to_string(fast)=>'%s'\n", str); |
| 7694 | return xstrdup(str); |
| 7695 | } |
| 7696 | |
| 7697 | argv[0] = (char*)str; |
| 7698 | argv[1] = NULL; |
| 7699 | list = expand_variables(argv, EXP_flags | EXP_FLAG_SINGLEWORD); |
| 7700 | if (!list[0]) { |
| 7701 | /* Example where it happens: |
| 7702 | * x=; echo ${x:-"$@"} |
| 7703 | */ |
| 7704 | ((char*)list)[0] = '\0'; |
| 7705 | } else { |
| 7706 | if (HUSH_DEBUG) |
| 7707 | if (list[1]) |
| 7708 | bb_simple_error_msg_and_die("BUG in varexp2"); |
| 7709 | /* actually, just move string 2*sizeof(char*) bytes back */ |
| 7710 | overlapping_strcpy((char*)list, list[0]); |
| 7711 | if (do_unbackslash) |
| 7712 | unbackslash((char*)list); |
| 7713 | } |
| 7714 | debug_printf_expand("string_to_string=>'%s'\n", (char*)list); |
| 7715 | return (char*)list; |
| 7716 | } |
| 7717 | |
| 7718 | #if 0 |
| 7719 | static char* expand_strvec_to_string(char **argv) |
| 7720 | { |
| 7721 | char **list; |
| 7722 | |
| 7723 | list = expand_variables(argv, EXP_FLAG_SINGLEWORD); |
| 7724 | /* Convert all NULs to spaces */ |
| 7725 | if (list[0]) { |
| 7726 | int n = 1; |
| 7727 | while (list[n]) { |
| 7728 | if (HUSH_DEBUG) |
| 7729 | if (list[n-1] + strlen(list[n-1]) + 1 != list[n]) |
| 7730 | bb_error_msg_and_die("BUG in varexp3"); |
| 7731 | /* bash uses ' ' regardless of $IFS contents */ |
| 7732 | list[n][-1] = ' '; |
| 7733 | n++; |
| 7734 | } |
| 7735 | } |
| 7736 | overlapping_strcpy((char*)list, list[0] ? list[0] : ""); |
| 7737 | debug_printf_expand("strvec_to_string='%s'\n", (char*)list); |
| 7738 | return (char*)list; |
| 7739 | } |
| 7740 | #endif |
| 7741 | |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 7742 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 7743 | static char **expand_assignments(char **argv, int count) |
| 7744 | { |
| 7745 | int i; |
| 7746 | char **p; |
| 7747 | |
| 7748 | G.expanded_assignments = p = NULL; |
| 7749 | /* Expand assignments into one string each */ |
| 7750 | for (i = 0; i < count; i++) { |
| 7751 | p = add_string_to_strings(p, |
| 7752 | expand_string_to_string(argv[i], |
| 7753 | EXP_FLAG_ESC_GLOB_CHARS, |
| 7754 | /*unbackslash:*/ 1 |
| 7755 | ) |
| 7756 | ); |
| 7757 | G.expanded_assignments = p; |
| 7758 | } |
| 7759 | G.expanded_assignments = NULL; |
| 7760 | return p; |
| 7761 | } |
| 7762 | |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 7763 | static void switch_off_special_sigs(unsigned mask) |
| 7764 | { |
| 7765 | unsigned sig = 0; |
| 7766 | while ((mask >>= 1) != 0) { |
| 7767 | sig++; |
| 7768 | if (!(mask & 1)) |
| 7769 | continue; |
| 7770 | #if ENABLE_HUSH_TRAP |
| 7771 | if (G_traps) { |
| 7772 | if (G_traps[sig] && !G_traps[sig][0]) |
| 7773 | /* trap is '', has to remain SIG_IGN */ |
| 7774 | continue; |
| 7775 | free(G_traps[sig]); |
| 7776 | G_traps[sig] = NULL; |
| 7777 | } |
| 7778 | #endif |
| 7779 | /* We are here only if no trap or trap was not '' */ |
| 7780 | install_sighandler(sig, SIG_DFL); |
| 7781 | } |
| 7782 | } |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 7783 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 7784 | |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 7785 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 7786 | #if BB_MMU |
| 7787 | /* never called */ |
| 7788 | void re_execute_shell(char ***to_free, const char *s, |
| 7789 | char *g_argv0, char **g_argv, |
| 7790 | char **builtin_argv) NORETURN; |
| 7791 | |
| 7792 | static void reset_traps_to_defaults(void) |
| 7793 | { |
| 7794 | /* This function is always called in a child shell |
| 7795 | * after fork (not vfork, NOMMU doesn't use this function). |
| 7796 | */ |
| 7797 | IF_HUSH_TRAP(unsigned sig;) |
| 7798 | unsigned mask; |
| 7799 | |
| 7800 | /* Child shells are not interactive. |
| 7801 | * SIGTTIN/SIGTTOU/SIGTSTP should not have special handling. |
| 7802 | * Testcase: (while :; do :; done) + ^Z should background. |
| 7803 | * Same goes for SIGTERM, SIGHUP, SIGINT. |
| 7804 | */ |
| 7805 | mask = (G.special_sig_mask & SPECIAL_INTERACTIVE_SIGS) | G_fatal_sig_mask; |
| 7806 | if (!G_traps && !mask) |
| 7807 | return; /* already no traps and no special sigs */ |
| 7808 | |
| 7809 | /* Switch off special sigs */ |
| 7810 | switch_off_special_sigs(mask); |
| 7811 | # if ENABLE_HUSH_JOB |
| 7812 | G_fatal_sig_mask = 0; |
| 7813 | # endif |
| 7814 | G.special_sig_mask &= ~SPECIAL_INTERACTIVE_SIGS; |
| 7815 | /* SIGQUIT,SIGCHLD and maybe SPECIAL_JOBSTOP_SIGS |
| 7816 | * remain set in G.special_sig_mask */ |
| 7817 | |
| 7818 | # if ENABLE_HUSH_TRAP |
| 7819 | if (!G_traps) |
| 7820 | return; |
| 7821 | |
| 7822 | /* Reset all sigs to default except ones with empty traps */ |
| 7823 | for (sig = 0; sig < NSIG; sig++) { |
| 7824 | if (!G_traps[sig]) |
| 7825 | continue; /* no trap: nothing to do */ |
| 7826 | if (!G_traps[sig][0]) |
| 7827 | continue; /* empty trap: has to remain SIG_IGN */ |
| 7828 | /* sig has non-empty trap, reset it: */ |
| 7829 | free(G_traps[sig]); |
| 7830 | G_traps[sig] = NULL; |
| 7831 | /* There is no signal for trap 0 (EXIT) */ |
| 7832 | if (sig == 0) |
| 7833 | continue; |
| 7834 | install_sighandler(sig, pick_sighandler(sig)); |
| 7835 | } |
| 7836 | # endif |
| 7837 | } |
| 7838 | |
| 7839 | #else /* !BB_MMU */ |
| 7840 | |
| 7841 | static void re_execute_shell(char ***to_free, const char *s, |
| 7842 | char *g_argv0, char **g_argv, |
| 7843 | char **builtin_argv) NORETURN; |
| 7844 | static void re_execute_shell(char ***to_free, const char *s, |
| 7845 | char *g_argv0, char **g_argv, |
| 7846 | char **builtin_argv) |
| 7847 | { |
| 7848 | # define NOMMU_HACK_FMT ("-$%x:%x:%x:%x:%x:%llx" IF_HUSH_LOOPS(":%x")) |
| 7849 | /* delims + 2 * (number of bytes in printed hex numbers) */ |
| 7850 | char param_buf[sizeof(NOMMU_HACK_FMT) + 2 * (sizeof(int)*6 + sizeof(long long)*1)]; |
| 7851 | char *heredoc_argv[4]; |
| 7852 | struct variable *cur; |
| 7853 | # if ENABLE_HUSH_FUNCTIONS |
| 7854 | struct function *funcp; |
| 7855 | # endif |
| 7856 | char **argv, **pp; |
| 7857 | unsigned cnt; |
| 7858 | unsigned long long empty_trap_mask; |
| 7859 | |
| 7860 | if (!g_argv0) { /* heredoc */ |
| 7861 | argv = heredoc_argv; |
| 7862 | argv[0] = (char *) G.argv0_for_re_execing; |
| 7863 | argv[1] = (char *) "-<"; |
| 7864 | argv[2] = (char *) s; |
| 7865 | argv[3] = NULL; |
| 7866 | pp = &argv[3]; /* used as pointer to empty environment */ |
| 7867 | goto do_exec; |
| 7868 | } |
| 7869 | |
| 7870 | cnt = 0; |
| 7871 | pp = builtin_argv; |
| 7872 | if (pp) while (*pp++) |
| 7873 | cnt++; |
| 7874 | |
| 7875 | empty_trap_mask = 0; |
| 7876 | if (G_traps) { |
| 7877 | int sig; |
| 7878 | for (sig = 1; sig < NSIG; sig++) { |
| 7879 | if (G_traps[sig] && !G_traps[sig][0]) |
| 7880 | empty_trap_mask |= 1LL << sig; |
| 7881 | } |
| 7882 | } |
| 7883 | |
| 7884 | sprintf(param_buf, NOMMU_HACK_FMT |
| 7885 | , (unsigned) G.root_pid |
| 7886 | , (unsigned) G.root_ppid |
| 7887 | , (unsigned) G.last_bg_pid |
| 7888 | , (unsigned) G.last_exitcode |
| 7889 | , cnt |
| 7890 | , empty_trap_mask |
| 7891 | IF_HUSH_LOOPS(, G.depth_of_loop) |
| 7892 | ); |
| 7893 | # undef NOMMU_HACK_FMT |
| 7894 | /* 1:hush 2:-$<pid>:<pid>:<exitcode>:<etc...> <vars...> <funcs...> |
| 7895 | * 3:-c 4:<cmd> 5:<arg0> <argN...> 6:NULL |
| 7896 | */ |
| 7897 | cnt += 6; |
| 7898 | for (cur = G.top_var; cur; cur = cur->next) { |
| 7899 | if (!cur->flg_export || cur->flg_read_only) |
| 7900 | cnt += 2; |
| 7901 | } |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 7902 | # if ENABLE_HUSH_LINENO_VAR |
| 7903 | cnt += 2; |
| 7904 | # endif |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 7905 | # if ENABLE_HUSH_FUNCTIONS |
| 7906 | for (funcp = G.top_func; funcp; funcp = funcp->next) |
| 7907 | cnt += 3; |
| 7908 | # endif |
| 7909 | pp = g_argv; |
| 7910 | while (*pp++) |
| 7911 | cnt++; |
| 7912 | *to_free = argv = pp = xzalloc(sizeof(argv[0]) * cnt); |
| 7913 | *pp++ = (char *) G.argv0_for_re_execing; |
| 7914 | *pp++ = param_buf; |
| 7915 | for (cur = G.top_var; cur; cur = cur->next) { |
| 7916 | if (strcmp(cur->varstr, hush_version_str) == 0) |
| 7917 | continue; |
| 7918 | if (cur->flg_read_only) { |
| 7919 | *pp++ = (char *) "-R"; |
| 7920 | *pp++ = cur->varstr; |
| 7921 | } else if (!cur->flg_export) { |
| 7922 | *pp++ = (char *) "-V"; |
| 7923 | *pp++ = cur->varstr; |
| 7924 | } |
| 7925 | } |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 7926 | # if ENABLE_HUSH_LINENO_VAR |
| 7927 | *pp++ = (char *) "-L"; |
| 7928 | *pp++ = utoa(G.execute_lineno); |
| 7929 | # endif |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 7930 | # if ENABLE_HUSH_FUNCTIONS |
| 7931 | for (funcp = G.top_func; funcp; funcp = funcp->next) { |
| 7932 | *pp++ = (char *) "-F"; |
| 7933 | *pp++ = funcp->name; |
| 7934 | *pp++ = funcp->body_as_string; |
| 7935 | } |
| 7936 | # endif |
| 7937 | /* We can pass activated traps here. Say, -Tnn:trap_string |
| 7938 | * |
| 7939 | * However, POSIX says that subshells reset signals with traps |
| 7940 | * to SIG_DFL. |
| 7941 | * I tested bash-3.2 and it not only does that with true subshells |
| 7942 | * of the form ( list ), but with any forked children shells. |
| 7943 | * I set trap "echo W" WINCH; and then tried: |
| 7944 | * |
| 7945 | * { echo 1; sleep 20; echo 2; } & |
| 7946 | * while true; do echo 1; sleep 20; echo 2; break; done & |
| 7947 | * true | { echo 1; sleep 20; echo 2; } | cat |
| 7948 | * |
| 7949 | * In all these cases sending SIGWINCH to the child shell |
| 7950 | * did not run the trap. If I add trap "echo V" WINCH; |
| 7951 | * _inside_ group (just before echo 1), it works. |
| 7952 | * |
| 7953 | * I conclude it means we don't need to pass active traps here. |
| 7954 | */ |
| 7955 | *pp++ = (char *) "-c"; |
| 7956 | *pp++ = (char *) s; |
| 7957 | if (builtin_argv) { |
| 7958 | while (*++builtin_argv) |
| 7959 | *pp++ = *builtin_argv; |
| 7960 | *pp++ = (char *) ""; |
| 7961 | } |
| 7962 | *pp++ = g_argv0; |
| 7963 | while (*g_argv) |
| 7964 | *pp++ = *g_argv++; |
| 7965 | /* *pp = NULL; - is already there */ |
| 7966 | pp = environ; |
| 7967 | |
| 7968 | do_exec: |
| 7969 | debug_printf_exec("re_execute_shell pid:%d cmd:'%s'\n", getpid(), s); |
| 7970 | /* Don't propagate SIG_IGN to the child */ |
| 7971 | if (SPECIAL_JOBSTOP_SIGS != 0) |
| 7972 | switch_off_special_sigs(G.special_sig_mask & SPECIAL_JOBSTOP_SIGS); |
| 7973 | execve(bb_busybox_exec_path, argv, pp); |
| 7974 | /* Fallback. Useful for init=/bin/hush usage etc */ |
| 7975 | if (argv[0][0] == '/') |
| 7976 | execve(argv[0], argv, pp); |
| 7977 | xfunc_error_retval = 127; |
| 7978 | bb_simple_error_msg_and_die("can't re-execute the shell"); |
| 7979 | } |
| 7980 | #endif /* !BB_MMU */ |
| 7981 | |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 7982 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 7983 | |
| 7984 | static int run_and_free_list(struct pipe *pi); |
| 7985 | |
| 7986 | /* Executing from string: eval, sh -c '...' |
| 7987 | * or from file: /etc/profile, . file, sh <script>, sh (intereactive) |
| 7988 | * end_trigger controls how often we stop parsing |
| 7989 | * NUL: parse all, execute, return |
| 7990 | * ';': parse till ';' or newline, execute, repeat till EOF |
| 7991 | */ |
Francis Laniel | 3b13faf | 2023-12-22 22:02:34 +0100 | [diff] [blame] | 7992 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 7993 | static void parse_and_run_stream(struct in_str *inp, int end_trigger) |
Francis Laniel | 3b13faf | 2023-12-22 22:02:34 +0100 | [diff] [blame] | 7994 | #else /* __U_BOOT__ */ |
| 7995 | static int parse_and_run_stream(struct in_str *inp, int end_trigger) |
| 7996 | #endif /* __U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 7997 | { |
| 7998 | /* Why we need empty flag? |
| 7999 | * An obscure corner case "false; ``; echo $?": |
| 8000 | * empty command in `` should still set $? to 0. |
| 8001 | * But we can't just set $? to 0 at the start, |
| 8002 | * this breaks "false; echo `echo $?`" case. |
| 8003 | */ |
| 8004 | bool empty = 1; |
Francis Laniel | 3b13faf | 2023-12-22 22:02:34 +0100 | [diff] [blame] | 8005 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 8006 | while (1) { |
Francis Laniel | 3b13faf | 2023-12-22 22:02:34 +0100 | [diff] [blame] | 8007 | #else /* __U_BOOT__ */ |
| 8008 | do { |
| 8009 | #endif /* __U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 8010 | struct pipe *pipe_list; |
| 8011 | |
| 8012 | #if ENABLE_HUSH_INTERACTIVE |
| 8013 | if (end_trigger == ';') { |
| 8014 | G.promptmode = 0; /* PS1 */ |
| 8015 | debug_printf_prompt("%s promptmode=%d\n", __func__, G.promptmode); |
| 8016 | } |
| 8017 | #endif |
| 8018 | pipe_list = parse_stream(NULL, NULL, inp, end_trigger); |
| 8019 | if (!pipe_list || pipe_list == ERR_PTR) { /* EOF/error */ |
| 8020 | /* If we are in "big" script |
| 8021 | * (not in `cmd` or something similar)... |
| 8022 | */ |
| 8023 | if (pipe_list == ERR_PTR && end_trigger == ';') { |
| 8024 | /* Discard cached input (rest of line) */ |
| 8025 | int ch = inp->last_char; |
| 8026 | while (ch != EOF && ch != '\n') { |
| 8027 | //bb_error_msg("Discarded:'%c'", ch); |
| 8028 | ch = i_getch(inp); |
| 8029 | } |
| 8030 | /* Force prompt */ |
| 8031 | inp->p = NULL; |
| 8032 | /* This stream isn't empty */ |
| 8033 | empty = 0; |
| 8034 | continue; |
| 8035 | } |
| 8036 | if (!pipe_list && empty) |
| 8037 | G.last_exitcode = 0; |
| 8038 | break; |
| 8039 | } |
| 8040 | debug_print_tree(pipe_list, 0); |
| 8041 | debug_printf_exec("parse_and_run_stream: run_and_free_list\n"); |
Francis Laniel | 9a06837 | 2023-12-22 22:02:32 +0100 | [diff] [blame] | 8042 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 8043 | run_and_free_list(pipe_list); |
Francis Laniel | 9a06837 | 2023-12-22 22:02:32 +0100 | [diff] [blame] | 8044 | #else /* __U_BOOT__ */ |
| 8045 | int rcode = run_and_free_list(pipe_list); |
| 8046 | /* |
| 8047 | * We reset input string to not run the following command, so running |
| 8048 | * 'exit; echo foo' does not print foo. |
| 8049 | */ |
| 8050 | if (rcode <= EXIT_RET_CODE) |
| 8051 | setup_file_in_str(inp); |
| 8052 | #endif /* __U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 8053 | empty = 0; |
| 8054 | if (G_flag_return_in_progress == 1) |
| 8055 | break; |
Francis Laniel | 3b13faf | 2023-12-22 22:02:34 +0100 | [diff] [blame] | 8056 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 8057 | } |
Francis Laniel | 3b13faf | 2023-12-22 22:02:34 +0100 | [diff] [blame] | 8058 | #else /* __U_BOOT__ */ |
| 8059 | /* |
| 8060 | * This do/while is needed by run_command to avoid looping on a command |
| 8061 | * with syntax error. |
| 8062 | */ |
| 8063 | } while (!(G.run_command_flags & FLAG_EXIT_FROM_LOOP)); |
| 8064 | |
| 8065 | return G.last_exitcode; |
| 8066 | #endif /* __U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 8067 | } |
| 8068 | |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 8069 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 8070 | static void parse_and_run_string(const char *s) |
Francis Laniel | 3b13faf | 2023-12-22 22:02:34 +0100 | [diff] [blame] | 8071 | #else /* __U_BOOT__ */ |
| 8072 | static int parse_and_run_string(const char *s) |
| 8073 | #endif /* __U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 8074 | { |
| 8075 | struct in_str input; |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 8076 | #ifndef __U_BOOT__ |
| 8077 | IF_HUSH_LINENO_VAR(unsigned sv = G.parse_lineno;) |
| 8078 | #else /* __U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 8079 | //IF_HUSH_LINENO_VAR(unsigned sv = G.parse_lineno;) |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 8080 | #endif /* __U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 8081 | |
| 8082 | setup_string_in_str(&input, s); |
Francis Laniel | 3b13faf | 2023-12-22 22:02:34 +0100 | [diff] [blame] | 8083 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 8084 | parse_and_run_stream(&input, '\0'); |
Francis Laniel | 3b13faf | 2023-12-22 22:02:34 +0100 | [diff] [blame] | 8085 | #else /* __U_BOOT__ */ |
| 8086 | return parse_and_run_stream(&input, '\0'); |
| 8087 | #endif /* __U_BOOT__ */ |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 8088 | #ifndef __U_BOOT__ |
| 8089 | IF_HUSH_LINENO_VAR(unsigned sv = G.parse_lineno;) |
| 8090 | #else /* __U_BOOT__ */ |
| 8091 | //IF_HUSH_LINENO_VAR(unsigned sv = G.parse_lineno;) |
| 8092 | #endif /* __U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 8093 | } |
| 8094 | |
Francis Laniel | 3b13faf | 2023-12-22 22:02:34 +0100 | [diff] [blame] | 8095 | #ifdef __U_BOOT__ |
Francis Laniel | 3ea3c57 | 2023-12-22 22:02:35 +0100 | [diff] [blame] | 8096 | int parse_string_outer_modern(const char *cmd, int flags) |
Francis Laniel | 3b13faf | 2023-12-22 22:02:34 +0100 | [diff] [blame] | 8097 | { |
| 8098 | int ret; |
| 8099 | int old_flags; |
| 8100 | |
| 8101 | /* |
| 8102 | * Keep old values of run_command to be able to restore them once |
| 8103 | * command was executed. |
| 8104 | */ |
| 8105 | old_flags = G.run_command_flags; |
| 8106 | G.run_command_flags = flags; |
| 8107 | |
| 8108 | ret = parse_and_run_string(cmd); |
| 8109 | |
| 8110 | G.run_command_flags = old_flags; |
| 8111 | |
| 8112 | return ret; |
| 8113 | } |
| 8114 | #endif /* __U_BOOT__ */ |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 8115 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 8116 | static void parse_and_run_file(HFILE *fp) |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 8117 | #else /* __U_BOOT__ */ |
| 8118 | void parse_and_run_file(void) |
| 8119 | #endif /* __U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 8120 | { |
| 8121 | struct in_str input; |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 8122 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 8123 | IF_HUSH_LINENO_VAR(unsigned sv = G.parse_lineno;) |
| 8124 | |
| 8125 | IF_HUSH_LINENO_VAR(G.parse_lineno = 1;) |
| 8126 | setup_file_in_str(&input, fp); |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 8127 | #else /* __U_BOOT__ */ |
| 8128 | setup_file_in_str(&input); |
| 8129 | #endif /* __U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 8130 | parse_and_run_stream(&input, ';'); |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 8131 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 8132 | IF_HUSH_LINENO_VAR(G.parse_lineno = sv;) |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 8133 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 8134 | } |
| 8135 | |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 8136 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 8137 | #if ENABLE_HUSH_TICK |
| 8138 | static int generate_stream_from_string(const char *s, pid_t *pid_p) |
| 8139 | { |
| 8140 | pid_t pid; |
| 8141 | int channel[2]; |
| 8142 | # if !BB_MMU |
| 8143 | char **to_free = NULL; |
| 8144 | # endif |
| 8145 | |
| 8146 | xpipe(channel); |
| 8147 | pid = BB_MMU ? xfork() : xvfork(); |
| 8148 | if (pid == 0) { /* child */ |
| 8149 | disable_restore_tty_pgrp_on_exit(); |
| 8150 | /* Process substitution is not considered to be usual |
| 8151 | * 'command execution'. |
| 8152 | * SUSv3 says ctrl-Z should be ignored, ctrl-C should not. |
| 8153 | */ |
| 8154 | bb_signals(0 |
| 8155 | + (1 << SIGTSTP) |
| 8156 | + (1 << SIGTTIN) |
| 8157 | + (1 << SIGTTOU) |
| 8158 | , SIG_IGN); |
| 8159 | close(channel[0]); /* NB: close _first_, then move fd! */ |
| 8160 | xmove_fd(channel[1], 1); |
| 8161 | # if ENABLE_HUSH_TRAP |
| 8162 | /* Awful hack for `trap` or $(trap). |
| 8163 | * |
| 8164 | * http://www.opengroup.org/onlinepubs/009695399/utilities/trap.html |
| 8165 | * contains an example where "trap" is executed in a subshell: |
| 8166 | * |
| 8167 | * save_traps=$(trap) |
| 8168 | * ... |
| 8169 | * eval "$save_traps" |
| 8170 | * |
| 8171 | * Standard does not say that "trap" in subshell shall print |
| 8172 | * parent shell's traps. It only says that its output |
| 8173 | * must have suitable form, but then, in the above example |
| 8174 | * (which is not supposed to be normative), it implies that. |
| 8175 | * |
| 8176 | * bash (and probably other shell) does implement it |
| 8177 | * (traps are reset to defaults, but "trap" still shows them), |
| 8178 | * but as a result, "trap" logic is hopelessly messed up: |
| 8179 | * |
| 8180 | * # trap |
| 8181 | * trap -- 'echo Ho' SIGWINCH <--- we have a handler |
| 8182 | * # (trap) <--- trap is in subshell - no output (correct, traps are reset) |
| 8183 | * # true | trap <--- trap is in subshell - no output (ditto) |
| 8184 | * # echo `true | trap` <--- in subshell - output (but traps are reset!) |
| 8185 | * trap -- 'echo Ho' SIGWINCH |
| 8186 | * # echo `(trap)` <--- in subshell in subshell - output |
| 8187 | * trap -- 'echo Ho' SIGWINCH |
| 8188 | * # echo `true | (trap)` <--- in subshell in subshell in subshell - output! |
| 8189 | * trap -- 'echo Ho' SIGWINCH |
| 8190 | * |
| 8191 | * The rules when to forget and when to not forget traps |
| 8192 | * get really complex and nonsensical. |
| 8193 | * |
| 8194 | * Our solution: ONLY bare $(trap) or `trap` is special. |
| 8195 | */ |
| 8196 | s = skip_whitespace(s); |
| 8197 | if (is_prefixed_with(s, "trap") |
| 8198 | && skip_whitespace(s + 4)[0] == '\0' |
| 8199 | ) { |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 8200 | static const char *const argv[] ALIGN_PTR = { NULL, NULL }; |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 8201 | builtin_trap((char**)argv); |
| 8202 | fflush_all(); /* important */ |
| 8203 | _exit(0); |
| 8204 | } |
| 8205 | # endif |
| 8206 | # if BB_MMU |
| 8207 | /* Prevent it from trying to handle ctrl-z etc */ |
| 8208 | IF_HUSH_JOB(G.run_list_level = 1;) |
| 8209 | CLEAR_RANDOM_T(&G.random_gen); /* or else $RANDOM repeats in child */ |
| 8210 | reset_traps_to_defaults(); |
| 8211 | IF_HUSH_MODE_X(G.x_mode_depth++;) |
| 8212 | //bb_error_msg("%s: ++x_mode_depth=%d", __func__, G.x_mode_depth); |
| 8213 | parse_and_run_string(s); |
| 8214 | _exit(G.last_exitcode); |
| 8215 | # else |
| 8216 | /* We re-execute after vfork on NOMMU. This makes this script safe: |
| 8217 | * yes "0123456789012345678901234567890" | dd bs=32 count=64k >BIG |
| 8218 | * huge=`cat BIG` # was blocking here forever |
| 8219 | * echo OK |
| 8220 | */ |
| 8221 | re_execute_shell(&to_free, |
| 8222 | s, |
| 8223 | G.global_argv[0], |
| 8224 | G.global_argv + 1, |
| 8225 | NULL); |
| 8226 | # endif |
| 8227 | } |
| 8228 | |
| 8229 | /* parent */ |
| 8230 | *pid_p = pid; |
| 8231 | # if ENABLE_HUSH_FAST |
| 8232 | G.count_SIGCHLD++; |
| 8233 | //bb_error_msg("[%d] fork in generate_stream_from_string:" |
| 8234 | // " G.count_SIGCHLD:%d G.handled_SIGCHLD:%d", |
| 8235 | // getpid(), G.count_SIGCHLD, G.handled_SIGCHLD); |
| 8236 | # endif |
| 8237 | enable_restore_tty_pgrp_on_exit(); |
| 8238 | # if !BB_MMU |
| 8239 | free(to_free); |
| 8240 | # endif |
| 8241 | close(channel[1]); |
| 8242 | return channel[0]; |
| 8243 | } |
| 8244 | |
| 8245 | /* Return code is exit status of the process that is run. */ |
| 8246 | static int process_command_subs(o_string *dest, const char *s) |
| 8247 | { |
| 8248 | FILE *fp; |
| 8249 | pid_t pid; |
| 8250 | int status, ch, eol_cnt; |
| 8251 | |
| 8252 | fp = xfdopen_for_read(generate_stream_from_string(s, &pid)); |
| 8253 | |
| 8254 | /* Now send results of command back into original context */ |
| 8255 | eol_cnt = 0; |
| 8256 | while ((ch = getc(fp)) != EOF) { |
| 8257 | if (ch == '\0') |
| 8258 | continue; |
| 8259 | if (ch == '\n') { |
| 8260 | eol_cnt++; |
| 8261 | continue; |
| 8262 | } |
| 8263 | while (eol_cnt) { |
| 8264 | o_addchr(dest, '\n'); |
| 8265 | eol_cnt--; |
| 8266 | } |
| 8267 | o_addQchr(dest, ch); |
| 8268 | } |
| 8269 | |
| 8270 | debug_printf("done reading from `cmd` pipe, closing it\n"); |
| 8271 | fclose(fp); |
| 8272 | /* We need to extract exitcode. Test case |
| 8273 | * "true; echo `sleep 1; false` $?" |
| 8274 | * should print 1 */ |
| 8275 | safe_waitpid(pid, &status, 0); |
| 8276 | debug_printf("child exited. returning its exitcode:%d\n", WEXITSTATUS(status)); |
| 8277 | return WEXITSTATUS(status); |
| 8278 | } |
| 8279 | #endif /* ENABLE_HUSH_TICK */ |
| 8280 | |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 8281 | static void setup_heredoc(struct redir_struct *redir) |
| 8282 | { |
| 8283 | struct fd_pair pair; |
| 8284 | pid_t pid; |
| 8285 | int len, written; |
| 8286 | /* the _body_ of heredoc (misleading field name) */ |
| 8287 | const char *heredoc = redir->rd_filename; |
| 8288 | char *expanded; |
| 8289 | #if !BB_MMU |
| 8290 | char **to_free; |
| 8291 | #endif |
| 8292 | |
| 8293 | expanded = NULL; |
| 8294 | if (!(redir->rd_dup & HEREDOC_QUOTED)) { |
| 8295 | expanded = encode_then_expand_string(heredoc); |
| 8296 | if (expanded) |
| 8297 | heredoc = expanded; |
| 8298 | } |
| 8299 | len = strlen(heredoc); |
| 8300 | |
| 8301 | close(redir->rd_fd); /* often saves dup2+close in xmove_fd */ |
| 8302 | xpiped_pair(pair); |
| 8303 | xmove_fd(pair.rd, redir->rd_fd); |
| 8304 | |
| 8305 | /* Try writing without forking. Newer kernels have |
| 8306 | * dynamically growing pipes. Must use non-blocking write! */ |
| 8307 | ndelay_on(pair.wr); |
| 8308 | while (1) { |
| 8309 | written = write(pair.wr, heredoc, len); |
| 8310 | if (written <= 0) |
| 8311 | break; |
| 8312 | len -= written; |
| 8313 | if (len == 0) { |
| 8314 | close(pair.wr); |
| 8315 | free(expanded); |
| 8316 | return; |
| 8317 | } |
| 8318 | heredoc += written; |
| 8319 | } |
| 8320 | ndelay_off(pair.wr); |
| 8321 | |
| 8322 | /* Okay, pipe buffer was not big enough */ |
| 8323 | /* Note: we must not create a stray child (bastard? :) |
| 8324 | * for the unsuspecting parent process. Child creates a grandchild |
| 8325 | * and exits before parent execs the process which consumes heredoc |
| 8326 | * (that exec happens after we return from this function) */ |
| 8327 | #if !BB_MMU |
| 8328 | to_free = NULL; |
| 8329 | #endif |
| 8330 | pid = xvfork(); |
| 8331 | if (pid == 0) { |
| 8332 | /* child */ |
| 8333 | disable_restore_tty_pgrp_on_exit(); |
| 8334 | pid = BB_MMU ? xfork() : xvfork(); |
| 8335 | if (pid != 0) |
| 8336 | _exit(0); |
| 8337 | /* grandchild */ |
| 8338 | close(redir->rd_fd); /* read side of the pipe */ |
| 8339 | #if BB_MMU |
| 8340 | full_write(pair.wr, heredoc, len); /* may loop or block */ |
| 8341 | _exit(0); |
| 8342 | #else |
| 8343 | /* Delegate blocking writes to another process */ |
| 8344 | xmove_fd(pair.wr, STDOUT_FILENO); |
| 8345 | re_execute_shell(&to_free, heredoc, NULL, NULL, NULL); |
| 8346 | #endif |
| 8347 | } |
| 8348 | /* parent */ |
| 8349 | #if ENABLE_HUSH_FAST |
| 8350 | G.count_SIGCHLD++; |
| 8351 | //bb_error_msg("[%d] fork in setup_heredoc: G.count_SIGCHLD:%d G.handled_SIGCHLD:%d", getpid(), G.count_SIGCHLD, G.handled_SIGCHLD); |
| 8352 | #endif |
| 8353 | enable_restore_tty_pgrp_on_exit(); |
| 8354 | #if !BB_MMU |
| 8355 | free(to_free); |
| 8356 | #endif |
| 8357 | close(pair.wr); |
| 8358 | free(expanded); |
| 8359 | wait(NULL); /* wait till child has died */ |
| 8360 | } |
| 8361 | |
| 8362 | struct squirrel { |
| 8363 | int orig_fd; |
| 8364 | int moved_to; |
| 8365 | /* moved_to = n: fd was moved to n; restore back to orig_fd after redir */ |
| 8366 | /* moved_to = -1: fd was opened by redirect; close orig_fd after redir */ |
| 8367 | }; |
| 8368 | |
| 8369 | static struct squirrel *append_squirrel(struct squirrel *sq, int i, int orig, int moved) |
| 8370 | { |
| 8371 | sq = xrealloc(sq, (i + 2) * sizeof(sq[0])); |
| 8372 | sq[i].orig_fd = orig; |
| 8373 | sq[i].moved_to = moved; |
| 8374 | sq[i+1].orig_fd = -1; /* end marker */ |
| 8375 | return sq; |
| 8376 | } |
| 8377 | |
| 8378 | static struct squirrel *add_squirrel(struct squirrel *sq, int fd, int avoid_fd) |
| 8379 | { |
| 8380 | int moved_to; |
| 8381 | int i; |
| 8382 | |
| 8383 | i = 0; |
| 8384 | if (sq) for (; sq[i].orig_fd >= 0; i++) { |
| 8385 | /* If we collide with an already moved fd... */ |
| 8386 | if (fd == sq[i].moved_to) { |
| 8387 | sq[i].moved_to = dup_CLOEXEC(sq[i].moved_to, avoid_fd); |
| 8388 | debug_printf_redir("redirect_fd %d: already busy, moving to %d\n", fd, sq[i].moved_to); |
| 8389 | if (sq[i].moved_to < 0) /* what? */ |
| 8390 | xfunc_die(); |
| 8391 | return sq; |
| 8392 | } |
| 8393 | if (fd == sq[i].orig_fd) { |
| 8394 | /* Example: echo Hello >/dev/null 1>&2 */ |
| 8395 | debug_printf_redir("redirect_fd %d: already moved\n", fd); |
| 8396 | return sq; |
| 8397 | } |
| 8398 | } |
| 8399 | |
| 8400 | /* If this fd is open, we move and remember it; if it's closed, moved_to = -1 */ |
| 8401 | moved_to = dup_CLOEXEC(fd, avoid_fd); |
| 8402 | debug_printf_redir("redirect_fd %d: previous fd is moved to %d (-1 if it was closed)\n", fd, moved_to); |
| 8403 | if (moved_to < 0 && errno != EBADF) |
| 8404 | xfunc_die(); |
| 8405 | return append_squirrel(sq, i, fd, moved_to); |
| 8406 | } |
| 8407 | |
| 8408 | static struct squirrel *add_squirrel_closed(struct squirrel *sq, int fd) |
| 8409 | { |
| 8410 | int i; |
| 8411 | |
| 8412 | i = 0; |
| 8413 | if (sq) for (; sq[i].orig_fd >= 0; i++) { |
| 8414 | /* If we collide with an already moved fd... */ |
| 8415 | if (fd == sq[i].orig_fd) { |
| 8416 | /* Examples: |
| 8417 | * "echo 3>FILE 3>&- 3>FILE" |
| 8418 | * "echo 3>&- 3>FILE" |
| 8419 | * No need for last redirect to insert |
| 8420 | * another "need to close 3" indicator. |
| 8421 | */ |
| 8422 | debug_printf_redir("redirect_fd %d: already moved or closed\n", fd); |
| 8423 | return sq; |
| 8424 | } |
| 8425 | } |
| 8426 | |
| 8427 | debug_printf_redir("redirect_fd %d: previous fd was closed\n", fd); |
| 8428 | return append_squirrel(sq, i, fd, -1); |
| 8429 | } |
| 8430 | |
| 8431 | /* fd: redirect wants this fd to be used (e.g. 3>file). |
| 8432 | * Move all conflicting internally used fds, |
| 8433 | * and remember them so that we can restore them later. |
| 8434 | */ |
| 8435 | static int save_fd_on_redirect(int fd, int avoid_fd, struct squirrel **sqp) |
| 8436 | { |
| 8437 | if (avoid_fd < 9) /* the important case here is that it can be -1 */ |
| 8438 | avoid_fd = 9; |
| 8439 | |
| 8440 | #if ENABLE_HUSH_INTERACTIVE |
| 8441 | if (fd != 0 /* don't trigger for G_interactive_fd == 0 (that's "not interactive" flag) */ |
| 8442 | && fd == G_interactive_fd |
| 8443 | ) { |
| 8444 | /* Testcase: "ls -l /proc/$$/fd 255>&-" should work */ |
| 8445 | G_interactive_fd = xdup_CLOEXEC_and_close(G_interactive_fd, avoid_fd); |
| 8446 | debug_printf_redir("redirect_fd %d: matches interactive_fd, moving it to %d\n", fd, G_interactive_fd); |
| 8447 | return 1; /* "we closed fd" */ |
| 8448 | } |
| 8449 | #endif |
| 8450 | /* Are we called from setup_redirects(squirrel==NULL) |
| 8451 | * in redirect in a [v]forked child? |
| 8452 | */ |
| 8453 | if (sqp == NULL) { |
| 8454 | /* No need to move script fds. |
| 8455 | * For NOMMU case, it's actively wrong: we'd change ->fd |
| 8456 | * fields in memory for the parent, but parent's fds |
| 8457 | * aren't moved, it would use wrong fd! |
| 8458 | * Reproducer: "cmd 3>FILE" in script. |
| 8459 | * If we would call move_HFILEs_on_redirect(), child would: |
| 8460 | * fcntl64(3, F_DUPFD_CLOEXEC, 10) = 10 |
| 8461 | * close(3) = 0 |
| 8462 | * and change ->fd to 10 if fd#3 is a script fd. WRONG. |
| 8463 | */ |
| 8464 | //bb_error_msg("sqp == NULL: [v]forked child"); |
| 8465 | return 0; |
| 8466 | } |
| 8467 | |
| 8468 | /* If this one of script's fds? */ |
| 8469 | if (move_HFILEs_on_redirect(fd, avoid_fd)) |
| 8470 | return 1; /* yes. "we closed fd" (actually moved it) */ |
| 8471 | |
| 8472 | /* Are we called for "exec 3>FILE"? Came through |
| 8473 | * redirect_and_varexp_helper(squirrel=ERR_PTR) -> setup_redirects(ERR_PTR) |
| 8474 | * This case used to fail for this script: |
| 8475 | * exec 3>FILE |
| 8476 | * echo Ok |
| 8477 | * ...100000 more lines... |
| 8478 | * echo Ok |
| 8479 | * as follows: |
| 8480 | * read(3, "exec 3>FILE\necho Ok\necho Ok"..., 1024) = 1024 |
| 8481 | * open("FILE", O_WRONLY|O_CREAT|O_TRUNC|O_LARGEFILE, 0666) = 4 |
| 8482 | * dup2(4, 3) = 3 |
| 8483 | * ^^^^^^^^ oops, we lost fd#3 opened to our script! |
| 8484 | * close(4) = 0 |
| 8485 | * write(1, "Ok\n", 3) = 3 |
| 8486 | * ... = 3 |
| 8487 | * write(1, "Ok\n", 3) = 3 |
| 8488 | * read(3, 0x94fbc08, 1024) = -1 EBADF (Bad file descriptor) |
| 8489 | * ^^^^^^^^ oops, wrong fd!!! |
| 8490 | * With this case separate from sqp == NULL and *after* move_HFILEs, |
| 8491 | * it now works: |
| 8492 | */ |
| 8493 | if (sqp == ERR_PTR) { |
| 8494 | /* Don't preserve redirected fds: exec is _meant_ to change these */ |
| 8495 | //bb_error_msg("sqp == ERR_PTR: exec >FILE"); |
| 8496 | return 0; |
| 8497 | } |
| 8498 | |
| 8499 | /* Check whether it collides with any open fds (e.g. stdio), save fds as needed */ |
| 8500 | *sqp = add_squirrel(*sqp, fd, avoid_fd); |
| 8501 | return 0; /* "we did not close fd" */ |
| 8502 | } |
| 8503 | |
| 8504 | static void restore_redirects(struct squirrel *sq) |
| 8505 | { |
| 8506 | if (sq) { |
| 8507 | int i; |
| 8508 | for (i = 0; sq[i].orig_fd >= 0; i++) { |
| 8509 | if (sq[i].moved_to >= 0) { |
| 8510 | /* We simply die on error */ |
| 8511 | debug_printf_redir("restoring redirected fd from %d to %d\n", sq[i].moved_to, sq[i].orig_fd); |
| 8512 | xmove_fd(sq[i].moved_to, sq[i].orig_fd); |
| 8513 | } else { |
| 8514 | /* cmd1 9>FILE; cmd2_should_see_fd9_closed */ |
| 8515 | debug_printf_redir("restoring redirected fd %d: closing it\n", sq[i].orig_fd); |
| 8516 | close(sq[i].orig_fd); |
| 8517 | } |
| 8518 | } |
| 8519 | free(sq); |
| 8520 | } |
| 8521 | if (G.HFILE_stdin |
| 8522 | && G.HFILE_stdin->fd > STDIN_FILENO |
| 8523 | /* we compare > STDIN, not == STDIN, since hfgetc() |
| 8524 | * closes fd and sets ->fd to -1 if EOF is reached. |
| 8525 | * Testcase: echo 'pwd' | hush |
| 8526 | */ |
| 8527 | ) { |
| 8528 | /* Testcase: interactive "read r <FILE; echo $r; read r; echo $r". |
| 8529 | * Redirect moves ->fd to e.g. 10, |
| 8530 | * and it is not restored above (we do not restore script fds |
| 8531 | * after redirects, we just use new, "moved" fds). |
| 8532 | * However for stdin, get_user_input() -> read_line_input(), |
| 8533 | * and read builtin, depend on fd == STDIN_FILENO. |
| 8534 | */ |
| 8535 | debug_printf_redir("restoring %d to stdin\n", G.HFILE_stdin->fd); |
| 8536 | xmove_fd(G.HFILE_stdin->fd, STDIN_FILENO); |
| 8537 | G.HFILE_stdin->fd = STDIN_FILENO; |
| 8538 | } |
| 8539 | |
| 8540 | /* If moved, G_interactive_fd stays on new fd, not restoring it */ |
| 8541 | } |
| 8542 | |
| 8543 | #if ENABLE_FEATURE_SH_STANDALONE && BB_MMU |
| 8544 | static void close_saved_fds_and_FILE_fds(void) |
| 8545 | { |
| 8546 | if (G_interactive_fd) |
| 8547 | close(G_interactive_fd); |
| 8548 | close_all_HFILE_list(); |
| 8549 | } |
| 8550 | #endif |
| 8551 | |
| 8552 | static int internally_opened_fd(int fd, struct squirrel *sq) |
| 8553 | { |
| 8554 | int i; |
| 8555 | |
| 8556 | #if ENABLE_HUSH_INTERACTIVE |
| 8557 | if (fd == G_interactive_fd) |
| 8558 | return 1; |
| 8559 | #endif |
| 8560 | /* If this one of script's fds? */ |
| 8561 | if (fd_in_HFILEs(fd)) |
| 8562 | return 1; |
| 8563 | |
| 8564 | if (sq) for (i = 0; sq[i].orig_fd >= 0; i++) { |
| 8565 | if (fd == sq[i].moved_to) |
| 8566 | return 1; |
| 8567 | } |
| 8568 | return 0; |
| 8569 | } |
| 8570 | |
| 8571 | /* squirrel != NULL means we squirrel away copies of stdin, stdout, |
| 8572 | * and stderr if they are redirected. */ |
| 8573 | static int setup_redirects(struct command *prog, struct squirrel **sqp) |
| 8574 | { |
| 8575 | struct redir_struct *redir; |
| 8576 | |
| 8577 | for (redir = prog->redirects; redir; redir = redir->next) { |
| 8578 | int newfd; |
| 8579 | int closed; |
| 8580 | |
| 8581 | if (redir->rd_type == REDIRECT_HEREDOC2) { |
| 8582 | /* "rd_fd<<HERE" case */ |
| 8583 | save_fd_on_redirect(redir->rd_fd, /*avoid:*/ 0, sqp); |
| 8584 | /* for REDIRECT_HEREDOC2, rd_filename holds _contents_ |
| 8585 | * of the heredoc */ |
| 8586 | debug_printf_redir("set heredoc '%s'\n", |
| 8587 | redir->rd_filename); |
| 8588 | setup_heredoc(redir); |
| 8589 | continue; |
| 8590 | } |
| 8591 | |
| 8592 | if (redir->rd_dup == REDIRFD_TO_FILE) { |
| 8593 | /* "rd_fd<*>file" case (<*> is <,>,>>,<>) */ |
| 8594 | char *p; |
| 8595 | int mode; |
| 8596 | |
| 8597 | if (redir->rd_filename == NULL) { |
| 8598 | /* Examples: |
| 8599 | * "cmd >" (no filename) |
| 8600 | * "cmd > <file" (2nd redirect starts too early) |
| 8601 | */ |
| 8602 | syntax_error("invalid redirect"); |
| 8603 | continue; |
| 8604 | } |
| 8605 | mode = redir_table[redir->rd_type].mode; |
| 8606 | p = expand_string_to_string(redir->rd_filename, |
| 8607 | EXP_FLAG_ESC_GLOB_CHARS, /*unbackslash:*/ 1); |
| 8608 | newfd = open_or_warn(p, mode); |
| 8609 | free(p); |
| 8610 | if (newfd < 0) { |
| 8611 | /* Error message from open_or_warn can be lost |
| 8612 | * if stderr has been redirected, but bash |
| 8613 | * and ash both lose it as well |
| 8614 | * (though zsh doesn't!) |
| 8615 | */ |
| 8616 | return 1; |
| 8617 | } |
| 8618 | if (newfd == redir->rd_fd && sqp) { |
| 8619 | /* open() gave us precisely the fd we wanted. |
| 8620 | * This means that this fd was not busy |
| 8621 | * (not opened to anywhere). |
| 8622 | * Remember to close it on restore: |
| 8623 | */ |
| 8624 | *sqp = add_squirrel_closed(*sqp, newfd); |
| 8625 | debug_printf_redir("redir to previously closed fd %d\n", newfd); |
| 8626 | } |
| 8627 | } else { |
| 8628 | /* "rd_fd>&rd_dup" or "rd_fd>&-" case */ |
| 8629 | newfd = redir->rd_dup; |
| 8630 | } |
| 8631 | |
| 8632 | if (newfd == redir->rd_fd) |
| 8633 | continue; |
| 8634 | |
| 8635 | /* if "N>FILE": move newfd to redir->rd_fd */ |
| 8636 | /* if "N>&M": dup newfd to redir->rd_fd */ |
| 8637 | /* if "N>&-": close redir->rd_fd (newfd is REDIRFD_CLOSE) */ |
| 8638 | |
| 8639 | closed = save_fd_on_redirect(redir->rd_fd, /*avoid:*/ newfd, sqp); |
| 8640 | if (newfd == REDIRFD_CLOSE) { |
| 8641 | /* "N>&-" means "close me" */ |
| 8642 | if (!closed) { |
| 8643 | /* ^^^ optimization: saving may already |
| 8644 | * have closed it. If not... */ |
| 8645 | close(redir->rd_fd); |
| 8646 | } |
| 8647 | /* Sometimes we do another close on restore, getting EBADF. |
| 8648 | * Consider "echo 3>FILE 3>&-" |
| 8649 | * first redirect remembers "need to close 3", |
| 8650 | * and second redirect closes 3! Restore code then closes 3 again. |
| 8651 | */ |
| 8652 | } else { |
| 8653 | /* if newfd is a script fd or saved fd, simulate EBADF */ |
| 8654 | if (internally_opened_fd(newfd, sqp && sqp != ERR_PTR ? *sqp : NULL)) { |
| 8655 | //errno = EBADF; |
| 8656 | //bb_perror_msg_and_die("can't duplicate file descriptor"); |
| 8657 | newfd = -1; /* same effect as code above */ |
| 8658 | } |
| 8659 | xdup2(newfd, redir->rd_fd); |
| 8660 | if (redir->rd_dup == REDIRFD_TO_FILE) |
| 8661 | /* "rd_fd > FILE" */ |
| 8662 | close(newfd); |
| 8663 | /* else: "rd_fd > rd_dup" */ |
| 8664 | } |
| 8665 | } |
| 8666 | return 0; |
| 8667 | } |
| 8668 | |
| 8669 | static char *find_in_path(const char *arg) |
| 8670 | { |
| 8671 | char *ret = NULL; |
| 8672 | const char *PATH = get_local_var_value("PATH"); |
| 8673 | |
| 8674 | if (!PATH) |
| 8675 | return NULL; |
| 8676 | |
| 8677 | while (1) { |
| 8678 | const char *end = strchrnul(PATH, ':'); |
| 8679 | int sz = end - PATH; /* must be int! */ |
| 8680 | |
| 8681 | free(ret); |
| 8682 | if (sz != 0) { |
| 8683 | ret = xasprintf("%.*s/%s", sz, PATH, arg); |
| 8684 | } else { |
| 8685 | /* We have xxx::yyyy in $PATH, |
| 8686 | * it means "use current dir" */ |
| 8687 | ret = xstrdup(arg); |
| 8688 | } |
| 8689 | if (access(ret, F_OK) == 0) |
| 8690 | break; |
| 8691 | |
| 8692 | if (*end == '\0') { |
| 8693 | free(ret); |
| 8694 | return NULL; |
| 8695 | } |
| 8696 | PATH = end + 1; |
| 8697 | } |
| 8698 | |
| 8699 | return ret; |
| 8700 | } |
| 8701 | |
| 8702 | static const struct built_in_command *find_builtin_helper(const char *name, |
| 8703 | const struct built_in_command *x, |
| 8704 | const struct built_in_command *end) |
| 8705 | { |
| 8706 | while (x != end) { |
| 8707 | if (strcmp(name, x->b_cmd) != 0) { |
| 8708 | x++; |
| 8709 | continue; |
| 8710 | } |
| 8711 | debug_printf_exec("found builtin '%s'\n", name); |
| 8712 | return x; |
| 8713 | } |
| 8714 | return NULL; |
| 8715 | } |
| 8716 | static const struct built_in_command *find_builtin1(const char *name) |
| 8717 | { |
| 8718 | return find_builtin_helper(name, bltins1, &bltins1[ARRAY_SIZE(bltins1)]); |
| 8719 | } |
| 8720 | static const struct built_in_command *find_builtin(const char *name) |
| 8721 | { |
| 8722 | const struct built_in_command *x = find_builtin1(name); |
| 8723 | if (x) |
| 8724 | return x; |
| 8725 | return find_builtin_helper(name, bltins2, &bltins2[ARRAY_SIZE(bltins2)]); |
| 8726 | } |
| 8727 | |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 8728 | #if ENABLE_HUSH_JOB && ENABLE_FEATURE_TAB_COMPLETION |
| 8729 | static const char * FAST_FUNC hush_command_name(int i) |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 8730 | { |
| 8731 | if (/*i >= 0 && */ i < ARRAY_SIZE(bltins1)) { |
| 8732 | return bltins1[i].b_cmd; |
| 8733 | } |
| 8734 | i -= ARRAY_SIZE(bltins1); |
| 8735 | if (i < ARRAY_SIZE(bltins2)) { |
| 8736 | return bltins2[i].b_cmd; |
| 8737 | } |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 8738 | # if ENABLE_HUSH_FUNCTIONS |
| 8739 | { |
| 8740 | struct function *funcp; |
| 8741 | i -= ARRAY_SIZE(bltins2); |
| 8742 | for (funcp = G.top_func; funcp; funcp = funcp->next) { |
| 8743 | if (--i < 0) |
| 8744 | return funcp->name; |
| 8745 | } |
| 8746 | } |
| 8747 | # endif |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 8748 | return NULL; |
| 8749 | } |
| 8750 | #endif |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 8751 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 8752 | |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 8753 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 8754 | static void remove_nested_vars(void) |
| 8755 | { |
| 8756 | struct variable *cur; |
| 8757 | struct variable **cur_pp; |
| 8758 | |
| 8759 | cur_pp = &G.top_var; |
| 8760 | while ((cur = *cur_pp) != NULL) { |
| 8761 | if (cur->var_nest_level <= G.var_nest_level) { |
| 8762 | cur_pp = &cur->next; |
| 8763 | continue; |
| 8764 | } |
| 8765 | /* Unexport */ |
| 8766 | if (cur->flg_export) { |
| 8767 | debug_printf_env("unexporting nested '%s'/%u\n", cur->varstr, cur->var_nest_level); |
| 8768 | bb_unsetenv(cur->varstr); |
| 8769 | } |
| 8770 | /* Remove from global list */ |
| 8771 | *cur_pp = cur->next; |
| 8772 | /* Free */ |
| 8773 | if (!cur->max_len) { |
| 8774 | debug_printf_env("freeing nested '%s'/%u\n", cur->varstr, cur->var_nest_level); |
| 8775 | free(cur->varstr); |
| 8776 | } |
| 8777 | free(cur); |
| 8778 | } |
| 8779 | } |
| 8780 | |
| 8781 | static void enter_var_nest_level(void) |
| 8782 | { |
| 8783 | G.var_nest_level++; |
| 8784 | debug_printf_env("var_nest_level++ %u\n", G.var_nest_level); |
| 8785 | |
| 8786 | /* Try: f() { echo -n .; f; }; f |
| 8787 | * struct variable::var_nest_level is uint16_t, |
| 8788 | * thus limiting recursion to < 2^16. |
| 8789 | * In any case, with 8 Mbyte stack SEGV happens |
| 8790 | * not too long after 2^16 recursions anyway. |
| 8791 | */ |
| 8792 | if (G.var_nest_level > 0xff00) |
| 8793 | bb_error_msg_and_die("fatal recursion (depth %u)", G.var_nest_level); |
| 8794 | } |
| 8795 | |
| 8796 | static void leave_var_nest_level(void) |
| 8797 | { |
| 8798 | G.var_nest_level--; |
| 8799 | debug_printf_env("var_nest_level-- %u\n", G.var_nest_level); |
| 8800 | if (HUSH_DEBUG && (int)G.var_nest_level < 0) |
| 8801 | bb_simple_error_msg_and_die("BUG: nesting underflow"); |
| 8802 | |
| 8803 | remove_nested_vars(); |
| 8804 | } |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 8805 | #endif /* __U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 8806 | |
| 8807 | #if ENABLE_HUSH_FUNCTIONS |
| 8808 | static struct function **find_function_slot(const char *name) |
| 8809 | { |
| 8810 | struct function *funcp; |
| 8811 | struct function **funcpp = &G.top_func; |
| 8812 | |
| 8813 | while ((funcp = *funcpp) != NULL) { |
| 8814 | if (strcmp(name, funcp->name) == 0) { |
| 8815 | debug_printf_exec("found function '%s'\n", name); |
| 8816 | break; |
| 8817 | } |
| 8818 | funcpp = &funcp->next; |
| 8819 | } |
| 8820 | return funcpp; |
| 8821 | } |
| 8822 | |
| 8823 | static ALWAYS_INLINE const struct function *find_function(const char *name) |
| 8824 | { |
| 8825 | const struct function *funcp = *find_function_slot(name); |
| 8826 | return funcp; |
| 8827 | } |
| 8828 | |
| 8829 | /* Note: takes ownership on name ptr */ |
| 8830 | static struct function *new_function(char *name) |
| 8831 | { |
| 8832 | struct function **funcpp = find_function_slot(name); |
| 8833 | struct function *funcp = *funcpp; |
| 8834 | |
| 8835 | if (funcp != NULL) { |
| 8836 | struct command *cmd = funcp->parent_cmd; |
| 8837 | debug_printf_exec("func %p parent_cmd %p\n", funcp, cmd); |
| 8838 | if (!cmd) { |
| 8839 | debug_printf_exec("freeing & replacing function '%s'\n", funcp->name); |
| 8840 | free(funcp->name); |
| 8841 | /* Note: if !funcp->body, do not free body_as_string! |
| 8842 | * This is a special case of "-F name body" function: |
| 8843 | * body_as_string was not malloced! */ |
| 8844 | if (funcp->body) { |
| 8845 | free_pipe_list(funcp->body); |
| 8846 | # if !BB_MMU |
| 8847 | free(funcp->body_as_string); |
| 8848 | # endif |
| 8849 | } |
| 8850 | } else { |
| 8851 | debug_printf_exec("reinserting in tree & replacing function '%s'\n", funcp->name); |
| 8852 | cmd->argv[0] = funcp->name; |
| 8853 | cmd->group = funcp->body; |
| 8854 | # if !BB_MMU |
| 8855 | cmd->group_as_string = funcp->body_as_string; |
| 8856 | # endif |
| 8857 | } |
| 8858 | } else { |
| 8859 | debug_printf_exec("remembering new function '%s'\n", name); |
| 8860 | funcp = *funcpp = xzalloc(sizeof(*funcp)); |
| 8861 | /*funcp->next = NULL;*/ |
| 8862 | } |
| 8863 | |
| 8864 | funcp->name = name; |
| 8865 | return funcp; |
| 8866 | } |
| 8867 | |
| 8868 | # if ENABLE_HUSH_UNSET |
| 8869 | static void unset_func(const char *name) |
| 8870 | { |
| 8871 | struct function **funcpp = find_function_slot(name); |
| 8872 | struct function *funcp = *funcpp; |
| 8873 | |
| 8874 | if (funcp != NULL) { |
| 8875 | debug_printf_exec("freeing function '%s'\n", funcp->name); |
| 8876 | *funcpp = funcp->next; |
| 8877 | /* funcp is unlinked now, deleting it. |
| 8878 | * Note: if !funcp->body, the function was created by |
| 8879 | * "-F name body", do not free ->body_as_string |
| 8880 | * and ->name as they were not malloced. */ |
| 8881 | if (funcp->body) { |
| 8882 | free_pipe_list(funcp->body); |
| 8883 | free(funcp->name); |
| 8884 | # if !BB_MMU |
| 8885 | free(funcp->body_as_string); |
| 8886 | # endif |
| 8887 | } |
| 8888 | free(funcp); |
| 8889 | } |
| 8890 | } |
| 8891 | # endif |
| 8892 | |
| 8893 | # if BB_MMU |
| 8894 | #define exec_function(to_free, funcp, argv) \ |
| 8895 | exec_function(funcp, argv) |
| 8896 | # endif |
| 8897 | static void exec_function(char ***to_free, |
| 8898 | const struct function *funcp, |
| 8899 | char **argv) NORETURN; |
| 8900 | static void exec_function(char ***to_free, |
| 8901 | const struct function *funcp, |
| 8902 | char **argv) |
| 8903 | { |
| 8904 | # if BB_MMU |
| 8905 | int n; |
| 8906 | |
| 8907 | argv[0] = G.global_argv[0]; |
| 8908 | G.global_argv = argv; |
| 8909 | G.global_argc = n = 1 + string_array_len(argv + 1); |
| 8910 | |
| 8911 | // Example when we are here: "cmd | func" |
| 8912 | // func will run with saved-redirect fds open. |
| 8913 | // $ f() { echo /proc/self/fd/*; } |
| 8914 | // $ true | f |
| 8915 | // /proc/self/fd/0 /proc/self/fd/1 /proc/self/fd/2 /proc/self/fd/255 /proc/self/fd/3 |
| 8916 | // stdio^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ G_interactive_fd^ DIR fd for glob |
| 8917 | // Same in script: |
| 8918 | // $ . ./SCRIPT |
| 8919 | // /proc/self/fd/0 /proc/self/fd/1 /proc/self/fd/2 /proc/self/fd/255 /proc/self/fd/3 /proc/self/fd/4 |
| 8920 | // stdio^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ G_interactive_fd^ opened ./SCRIPT DIR fd for glob |
| 8921 | // They are CLOEXEC so external programs won't see them, but |
| 8922 | // for "more correctness" we might want to close those extra fds here: |
| 8923 | //? close_saved_fds_and_FILE_fds(); |
| 8924 | |
| 8925 | /* "we are in a function, ok to use return" */ |
| 8926 | G_flag_return_in_progress = -1; |
| 8927 | enter_var_nest_level(); |
| 8928 | IF_HUSH_LOCAL(G.func_nest_level++;) |
| 8929 | |
| 8930 | /* On MMU, funcp->body is always non-NULL */ |
| 8931 | n = run_list(funcp->body); |
| 8932 | _exit(n); |
| 8933 | # else |
| 8934 | //? close_saved_fds_and_FILE_fds(); |
| 8935 | |
| 8936 | //TODO: check whether "true | func_with_return" works |
| 8937 | |
| 8938 | re_execute_shell(to_free, |
| 8939 | funcp->body_as_string, |
| 8940 | G.global_argv[0], |
| 8941 | argv + 1, |
| 8942 | NULL); |
| 8943 | # endif |
| 8944 | } |
| 8945 | |
| 8946 | static int run_function(const struct function *funcp, char **argv) |
| 8947 | { |
| 8948 | int rc; |
| 8949 | save_arg_t sv; |
| 8950 | smallint sv_flg; |
| 8951 | |
| 8952 | save_and_replace_G_args(&sv, argv); |
| 8953 | |
| 8954 | /* "We are in function, ok to use return" */ |
| 8955 | sv_flg = G_flag_return_in_progress; |
| 8956 | G_flag_return_in_progress = -1; |
| 8957 | |
| 8958 | /* Make "local" variables properly shadow previous ones */ |
| 8959 | IF_HUSH_LOCAL(enter_var_nest_level();) |
| 8960 | IF_HUSH_LOCAL(G.func_nest_level++;) |
| 8961 | |
| 8962 | /* On MMU, funcp->body is always non-NULL */ |
| 8963 | # if !BB_MMU |
| 8964 | if (!funcp->body) { |
| 8965 | /* Function defined by -F */ |
| 8966 | parse_and_run_string(funcp->body_as_string); |
| 8967 | rc = G.last_exitcode; |
| 8968 | } else |
| 8969 | # endif |
| 8970 | { |
| 8971 | rc = run_list(funcp->body); |
| 8972 | } |
| 8973 | |
| 8974 | IF_HUSH_LOCAL(G.func_nest_level--;) |
| 8975 | IF_HUSH_LOCAL(leave_var_nest_level();) |
| 8976 | |
| 8977 | G_flag_return_in_progress = sv_flg; |
| 8978 | # if ENABLE_HUSH_TRAP |
| 8979 | debug_printf_exec("G.return_exitcode=-1\n"); |
| 8980 | G.return_exitcode = -1; /* invalidate stashed return value */ |
| 8981 | # endif |
| 8982 | |
| 8983 | restore_G_args(&sv, argv); |
| 8984 | |
| 8985 | return rc; |
| 8986 | } |
| 8987 | #endif /* ENABLE_HUSH_FUNCTIONS */ |
| 8988 | |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 8989 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 8990 | #if BB_MMU |
| 8991 | #define exec_builtin(to_free, x, argv) \ |
| 8992 | exec_builtin(x, argv) |
| 8993 | #else |
| 8994 | #define exec_builtin(to_free, x, argv) \ |
| 8995 | exec_builtin(to_free, argv) |
| 8996 | #endif |
| 8997 | static void exec_builtin(char ***to_free, |
| 8998 | const struct built_in_command *x, |
| 8999 | char **argv) NORETURN; |
| 9000 | static void exec_builtin(char ***to_free, |
| 9001 | const struct built_in_command *x, |
| 9002 | char **argv) |
| 9003 | { |
| 9004 | #if BB_MMU |
| 9005 | int rcode; |
| 9006 | //? close_saved_fds_and_FILE_fds(); |
| 9007 | rcode = x->b_function(argv); |
| 9008 | fflush_all(); |
| 9009 | _exit(rcode); |
| 9010 | #else |
| 9011 | fflush_all(); |
| 9012 | /* On NOMMU, we must never block! |
| 9013 | * Example: { sleep 99 | read line; } & echo Ok |
| 9014 | */ |
| 9015 | re_execute_shell(to_free, |
| 9016 | argv[0], |
| 9017 | G.global_argv[0], |
| 9018 | G.global_argv + 1, |
| 9019 | argv); |
| 9020 | #endif |
| 9021 | } |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 9022 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 9023 | |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 9024 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 9025 | static void execvp_or_die(char **argv) NORETURN; |
| 9026 | static void execvp_or_die(char **argv) |
| 9027 | { |
| 9028 | int e; |
| 9029 | debug_printf_exec("execing '%s'\n", argv[0]); |
| 9030 | /* Don't propagate SIG_IGN to the child */ |
| 9031 | if (SPECIAL_JOBSTOP_SIGS != 0) |
| 9032 | switch_off_special_sigs(G.special_sig_mask & SPECIAL_JOBSTOP_SIGS); |
| 9033 | execvp(argv[0], argv); |
| 9034 | e = 2; |
| 9035 | if (errno == EACCES) e = 126; |
| 9036 | if (errno == ENOENT) e = 127; |
| 9037 | bb_perror_msg("can't execute '%s'", argv[0]); |
| 9038 | _exit(e); |
| 9039 | } |
| 9040 | |
| 9041 | #if ENABLE_HUSH_MODE_X |
| 9042 | static void x_mode_print_optionally_squoted(const char *str) |
| 9043 | { |
| 9044 | unsigned len; |
| 9045 | const char *cp; |
| 9046 | |
| 9047 | cp = str; |
| 9048 | |
| 9049 | /* the set of chars which-cause-string-to-be-squoted mimics bash */ |
| 9050 | /* test a char with: bash -c 'set -x; echo "CH"' */ |
| 9051 | if (str[strcspn(str, "\\\"'`$(){}[]<>;#&|~*?!^" |
| 9052 | " " "\001\002\003\004\005\006\007" |
| 9053 | "\010\011\012\013\014\015\016\017" |
| 9054 | "\020\021\022\023\024\025\026\027" |
| 9055 | "\030\031\032\033\034\035\036\037" |
| 9056 | ) |
| 9057 | ] == '\0' |
| 9058 | ) { |
| 9059 | /* string has no special chars */ |
| 9060 | x_mode_addstr(str); |
| 9061 | return; |
| 9062 | } |
| 9063 | |
| 9064 | cp = str; |
| 9065 | for (;;) { |
| 9066 | /* print '....' up to EOL or first squote */ |
| 9067 | len = (int)(strchrnul(cp, '\'') - cp); |
| 9068 | if (len != 0) { |
| 9069 | x_mode_addchr('\''); |
| 9070 | x_mode_addblock(cp, len); |
| 9071 | x_mode_addchr('\''); |
| 9072 | cp += len; |
| 9073 | } |
| 9074 | if (*cp == '\0') |
| 9075 | break; |
| 9076 | /* string contains squote(s), print them as \' */ |
| 9077 | x_mode_addchr('\\'); |
| 9078 | x_mode_addchr('\''); |
| 9079 | cp++; |
| 9080 | } |
| 9081 | } |
| 9082 | static void dump_cmd_in_x_mode(char **argv) |
| 9083 | { |
| 9084 | if (G_x_mode && argv) { |
| 9085 | unsigned n; |
| 9086 | |
| 9087 | /* "+[+++...][ cmd...]\n\0" */ |
| 9088 | x_mode_prefix(); |
| 9089 | n = 0; |
| 9090 | while (argv[n]) { |
| 9091 | x_mode_addchr(' '); |
| 9092 | if (argv[n][0] == '\0') { |
| 9093 | x_mode_addchr('\''); |
| 9094 | x_mode_addchr('\''); |
| 9095 | } else { |
| 9096 | x_mode_print_optionally_squoted(argv[n]); |
| 9097 | } |
| 9098 | n++; |
| 9099 | } |
| 9100 | x_mode_flush(); |
| 9101 | } |
| 9102 | } |
| 9103 | #else |
| 9104 | # define dump_cmd_in_x_mode(argv) ((void)0) |
| 9105 | #endif |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 9106 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 9107 | |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 9108 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 9109 | #if ENABLE_HUSH_COMMAND |
| 9110 | static void if_command_vV_print_and_exit(char opt_vV, char *cmd, const char *explanation) |
| 9111 | { |
| 9112 | char *to_free; |
| 9113 | |
| 9114 | if (!opt_vV) |
| 9115 | return; |
| 9116 | |
| 9117 | to_free = NULL; |
| 9118 | if (!explanation) { |
| 9119 | char *path = getenv("PATH"); |
| 9120 | explanation = to_free = find_executable(cmd, &path); /* path == NULL is ok */ |
| 9121 | if (!explanation) |
| 9122 | _exit(1); /* PROG was not found */ |
| 9123 | if (opt_vV != 'V') |
| 9124 | cmd = to_free; /* -v PROG prints "/path/to/PROG" */ |
| 9125 | } |
| 9126 | printf((opt_vV == 'V') ? "%s is %s\n" : "%s\n", cmd, explanation); |
| 9127 | free(to_free); |
| 9128 | fflush_all(); |
| 9129 | _exit(0); |
| 9130 | } |
| 9131 | #else |
| 9132 | # define if_command_vV_print_and_exit(a,b,c) ((void)0) |
| 9133 | #endif |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 9134 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 9135 | |
| 9136 | #if BB_MMU |
| 9137 | #define pseudo_exec_argv(nommu_save, argv, assignment_cnt, argv_expanded) \ |
| 9138 | pseudo_exec_argv(argv, assignment_cnt, argv_expanded) |
| 9139 | #define pseudo_exec(nommu_save, command, argv_expanded) \ |
| 9140 | pseudo_exec(command, argv_expanded) |
| 9141 | #endif |
| 9142 | |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 9143 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 9144 | /* Called after [v]fork() in run_pipe, or from builtin_exec. |
| 9145 | * Never returns. |
| 9146 | * Don't exit() here. If you don't exec, use _exit instead. |
| 9147 | * The at_exit handlers apparently confuse the calling process, |
| 9148 | * in particular stdin handling. Not sure why? -- because of vfork! (vda) |
| 9149 | */ |
| 9150 | static void pseudo_exec_argv(nommu_save_t *nommu_save, |
| 9151 | char **argv, int assignment_cnt, |
| 9152 | char **argv_expanded) NORETURN; |
| 9153 | static NOINLINE void pseudo_exec_argv(nommu_save_t *nommu_save, |
| 9154 | char **argv, int assignment_cnt, |
| 9155 | char **argv_expanded) |
| 9156 | { |
| 9157 | const struct built_in_command *x; |
| 9158 | struct variable **sv_shadowed; |
| 9159 | char **new_env; |
| 9160 | IF_HUSH_COMMAND(char opt_vV = 0;) |
| 9161 | IF_HUSH_FUNCTIONS(const struct function *funcp;) |
| 9162 | |
| 9163 | new_env = expand_assignments(argv, assignment_cnt); |
| 9164 | dump_cmd_in_x_mode(new_env); |
| 9165 | |
| 9166 | if (!argv[assignment_cnt]) { |
| 9167 | /* Case when we are here: ... | var=val | ... |
| 9168 | * (note that we do not exit early, i.e., do not optimize out |
| 9169 | * expand_assignments(): think about ... | var=`sleep 1` | ... |
| 9170 | */ |
| 9171 | free_strings(new_env); |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 9172 | _exit_SUCCESS(); |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 9173 | } |
| 9174 | |
| 9175 | sv_shadowed = G.shadowed_vars_pp; |
| 9176 | #if BB_MMU |
| 9177 | G.shadowed_vars_pp = NULL; /* "don't save, free them instead" */ |
| 9178 | #else |
| 9179 | G.shadowed_vars_pp = &nommu_save->old_vars; |
| 9180 | G.var_nest_level++; |
| 9181 | #endif |
| 9182 | set_vars_and_save_old(new_env); |
| 9183 | G.shadowed_vars_pp = sv_shadowed; |
| 9184 | |
| 9185 | if (argv_expanded) { |
| 9186 | argv = argv_expanded; |
| 9187 | } else { |
| 9188 | argv = expand_strvec_to_strvec(argv + assignment_cnt); |
| 9189 | #if !BB_MMU |
| 9190 | nommu_save->argv = argv; |
| 9191 | #endif |
| 9192 | } |
| 9193 | dump_cmd_in_x_mode(argv); |
| 9194 | |
| 9195 | #if ENABLE_FEATURE_SH_STANDALONE || BB_MMU |
| 9196 | if (strchr(argv[0], '/') != NULL) |
| 9197 | goto skip; |
| 9198 | #endif |
| 9199 | |
| 9200 | #if ENABLE_HUSH_FUNCTIONS |
| 9201 | /* Check if the command matches any functions (this goes before bltins) */ |
| 9202 | funcp = find_function(argv[0]); |
| 9203 | if (funcp) |
| 9204 | exec_function(&nommu_save->argv_from_re_execing, funcp, argv); |
| 9205 | #endif |
| 9206 | |
| 9207 | #if ENABLE_HUSH_COMMAND |
| 9208 | /* "command BAR": run BAR without looking it up among functions |
| 9209 | * "command -v BAR": print "BAR" or "/path/to/BAR"; or exit 1 |
| 9210 | * "command -V BAR": print "BAR is {a function,a shell builtin,/path/to/BAR}" |
| 9211 | */ |
| 9212 | while (strcmp(argv[0], "command") == 0 && argv[1]) { |
| 9213 | char *p; |
| 9214 | |
| 9215 | argv++; |
| 9216 | p = *argv; |
| 9217 | if (p[0] != '-' || !p[1]) |
| 9218 | continue; /* bash allows "command command command [-OPT] BAR" */ |
| 9219 | |
| 9220 | for (;;) { |
| 9221 | p++; |
| 9222 | switch (*p) { |
| 9223 | case '\0': |
| 9224 | argv++; |
| 9225 | p = *argv; |
| 9226 | if (p[0] != '-' || !p[1]) |
| 9227 | goto after_opts; |
| 9228 | continue; /* next arg is also -opts, process it too */ |
| 9229 | case 'v': |
| 9230 | case 'V': |
| 9231 | opt_vV = *p; |
| 9232 | continue; |
| 9233 | default: |
| 9234 | bb_error_msg_and_die("%s: %s: invalid option", "command", argv[0]); |
| 9235 | } |
| 9236 | } |
| 9237 | } |
| 9238 | after_opts: |
| 9239 | # if ENABLE_HUSH_FUNCTIONS |
| 9240 | if (opt_vV && find_function(argv[0])) |
| 9241 | if_command_vV_print_and_exit(opt_vV, argv[0], "a function"); |
| 9242 | # endif |
| 9243 | #endif |
| 9244 | |
| 9245 | /* Check if the command matches any of the builtins. |
| 9246 | * Depending on context, this might be redundant. But it's |
| 9247 | * easier to waste a few CPU cycles than it is to figure out |
| 9248 | * if this is one of those cases. |
| 9249 | */ |
| 9250 | /* Why "BB_MMU ? :" difference in logic? - |
| 9251 | * On NOMMU, it is more expensive to re-execute shell |
| 9252 | * just in order to run echo or test builtin. |
| 9253 | * It's better to skip it here and run corresponding |
| 9254 | * non-builtin later. */ |
| 9255 | x = BB_MMU ? find_builtin(argv[0]) : find_builtin1(argv[0]); |
| 9256 | if (x) { |
| 9257 | if_command_vV_print_and_exit(opt_vV, argv[0], "a shell builtin"); |
| 9258 | exec_builtin(&nommu_save->argv_from_re_execing, x, argv); |
| 9259 | } |
| 9260 | |
| 9261 | #if ENABLE_FEATURE_SH_STANDALONE |
| 9262 | /* Check if the command matches any busybox applets */ |
| 9263 | { |
| 9264 | int a = find_applet_by_name(argv[0]); |
| 9265 | if (a >= 0) { |
| 9266 | if_command_vV_print_and_exit(opt_vV, argv[0], "an applet"); |
| 9267 | # if BB_MMU /* see above why on NOMMU it is not allowed */ |
| 9268 | if (APPLET_IS_NOEXEC(a)) { |
| 9269 | /* Do not leak open fds from opened script files etc. |
| 9270 | * Testcase: interactive "ls -l /proc/self/fd" |
| 9271 | * should not show tty fd open. |
| 9272 | */ |
| 9273 | close_saved_fds_and_FILE_fds(); |
| 9274 | //FIXME: should also close saved redir fds |
| 9275 | //This casuses test failures in |
| 9276 | //redir_children_should_not_see_saved_fd_2.tests |
| 9277 | //redir_children_should_not_see_saved_fd_3.tests |
| 9278 | //if you replace "busybox find" with just "find" in them |
| 9279 | /* Without this, "rm -i FILE" can't be ^C'ed: */ |
| 9280 | switch_off_special_sigs(G.special_sig_mask); |
| 9281 | debug_printf_exec("running applet '%s'\n", argv[0]); |
| 9282 | run_noexec_applet_and_exit(a, argv[0], argv); |
| 9283 | } |
| 9284 | # endif |
| 9285 | /* Re-exec ourselves */ |
| 9286 | debug_printf_exec("re-execing applet '%s'\n", argv[0]); |
| 9287 | /* Don't propagate SIG_IGN to the child */ |
| 9288 | if (SPECIAL_JOBSTOP_SIGS != 0) |
| 9289 | switch_off_special_sigs(G.special_sig_mask & SPECIAL_JOBSTOP_SIGS); |
| 9290 | execv(bb_busybox_exec_path, argv); |
| 9291 | /* If they called chroot or otherwise made the binary no longer |
| 9292 | * executable, fall through */ |
| 9293 | } |
| 9294 | } |
| 9295 | #endif |
| 9296 | |
| 9297 | #if ENABLE_FEATURE_SH_STANDALONE || BB_MMU |
| 9298 | skip: |
| 9299 | #endif |
| 9300 | if_command_vV_print_and_exit(opt_vV, argv[0], NULL); |
| 9301 | execvp_or_die(argv); |
| 9302 | } |
| 9303 | |
| 9304 | /* Called after [v]fork() in run_pipe |
| 9305 | */ |
| 9306 | static void pseudo_exec(nommu_save_t *nommu_save, |
| 9307 | struct command *command, |
| 9308 | char **argv_expanded) NORETURN; |
| 9309 | static void pseudo_exec(nommu_save_t *nommu_save, |
| 9310 | struct command *command, |
| 9311 | char **argv_expanded) |
| 9312 | { |
| 9313 | #if ENABLE_HUSH_FUNCTIONS |
| 9314 | if (command->cmd_type == CMD_FUNCDEF) { |
| 9315 | /* Ignore funcdefs in pipes: |
| 9316 | * true | f() { cmd } |
| 9317 | */ |
| 9318 | _exit(0); |
| 9319 | } |
| 9320 | #endif |
| 9321 | |
| 9322 | if (command->argv) { |
| 9323 | pseudo_exec_argv(nommu_save, command->argv, |
| 9324 | command->assignment_cnt, argv_expanded); |
| 9325 | } |
| 9326 | |
| 9327 | if (command->group) { |
| 9328 | /* Cases when we are here: |
| 9329 | * ( list ) |
| 9330 | * { list } & |
| 9331 | * ... | ( list ) | ... |
| 9332 | * ... | { list } | ... |
| 9333 | */ |
| 9334 | #if BB_MMU |
| 9335 | int rcode; |
| 9336 | debug_printf_exec("pseudo_exec: run_list\n"); |
| 9337 | reset_traps_to_defaults(); |
| 9338 | rcode = run_list(command->group); |
| 9339 | /* OK to leak memory by not calling free_pipe_list, |
| 9340 | * since this process is about to exit */ |
| 9341 | _exit(rcode); |
| 9342 | #else |
| 9343 | re_execute_shell(&nommu_save->argv_from_re_execing, |
| 9344 | command->group_as_string, |
| 9345 | G.global_argv[0], |
| 9346 | G.global_argv + 1, |
| 9347 | NULL); |
| 9348 | #endif |
| 9349 | } |
| 9350 | |
| 9351 | /* Case when we are here: ... | >file */ |
| 9352 | debug_printf_exec("pseudo_exec'ed null command\n"); |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 9353 | _exit_SUCCESS(); |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 9354 | } |
| 9355 | |
| 9356 | #if ENABLE_HUSH_JOB |
| 9357 | static const char *get_cmdtext(struct pipe *pi) |
| 9358 | { |
| 9359 | char **argv; |
| 9360 | char *p; |
| 9361 | int len; |
| 9362 | |
| 9363 | /* This is subtle. ->cmdtext is created only on first backgrounding. |
| 9364 | * (Think "cat, <ctrl-z>, fg, <ctrl-z>, fg, <ctrl-z>...." here...) |
| 9365 | * On subsequent bg argv is trashed, but we won't use it */ |
| 9366 | if (pi->cmdtext) |
| 9367 | return pi->cmdtext; |
| 9368 | |
| 9369 | argv = pi->cmds[0].argv; |
| 9370 | if (!argv) { |
| 9371 | pi->cmdtext = xzalloc(1); |
| 9372 | return pi->cmdtext; |
| 9373 | } |
| 9374 | len = 0; |
| 9375 | do { |
| 9376 | len += strlen(*argv) + 1; |
| 9377 | } while (*++argv); |
| 9378 | p = xmalloc(len); |
| 9379 | pi->cmdtext = p; |
| 9380 | argv = pi->cmds[0].argv; |
| 9381 | do { |
| 9382 | p = stpcpy(p, *argv); |
| 9383 | *p++ = ' '; |
| 9384 | } while (*++argv); |
| 9385 | p[-1] = '\0'; |
| 9386 | return pi->cmdtext; |
| 9387 | } |
| 9388 | |
| 9389 | static void remove_job_from_table(struct pipe *pi) |
| 9390 | { |
| 9391 | struct pipe *prev_pipe; |
| 9392 | |
| 9393 | if (pi == G.job_list) { |
| 9394 | G.job_list = pi->next; |
| 9395 | } else { |
| 9396 | prev_pipe = G.job_list; |
| 9397 | while (prev_pipe->next != pi) |
| 9398 | prev_pipe = prev_pipe->next; |
| 9399 | prev_pipe->next = pi->next; |
| 9400 | } |
| 9401 | G.last_jobid = 0; |
| 9402 | if (G.job_list) |
| 9403 | G.last_jobid = G.job_list->jobid; |
| 9404 | } |
| 9405 | |
| 9406 | static void delete_finished_job(struct pipe *pi) |
| 9407 | { |
| 9408 | remove_job_from_table(pi); |
| 9409 | free_pipe(pi); |
| 9410 | } |
| 9411 | |
| 9412 | static void clean_up_last_dead_job(void) |
| 9413 | { |
| 9414 | if (G.job_list && !G.job_list->alive_cmds) |
| 9415 | delete_finished_job(G.job_list); |
| 9416 | } |
| 9417 | |
| 9418 | static void insert_job_into_table(struct pipe *pi) |
| 9419 | { |
| 9420 | struct pipe *job, **jobp; |
| 9421 | int i; |
| 9422 | |
| 9423 | clean_up_last_dead_job(); |
| 9424 | |
| 9425 | /* Find the end of the list, and find next job ID to use */ |
| 9426 | i = 0; |
| 9427 | jobp = &G.job_list; |
| 9428 | while ((job = *jobp) != NULL) { |
| 9429 | if (job->jobid > i) |
| 9430 | i = job->jobid; |
| 9431 | jobp = &job->next; |
| 9432 | } |
| 9433 | pi->jobid = i + 1; |
| 9434 | |
| 9435 | /* Create a new job struct at the end */ |
| 9436 | job = *jobp = xmemdup(pi, sizeof(*pi)); |
| 9437 | job->next = NULL; |
| 9438 | job->cmds = xzalloc(sizeof(pi->cmds[0]) * pi->num_cmds); |
| 9439 | /* Cannot copy entire pi->cmds[] vector! This causes double frees */ |
| 9440 | for (i = 0; i < pi->num_cmds; i++) { |
| 9441 | job->cmds[i].pid = pi->cmds[i].pid; |
| 9442 | /* all other fields are not used and stay zero */ |
| 9443 | } |
| 9444 | job->cmdtext = xstrdup(get_cmdtext(pi)); |
| 9445 | |
| 9446 | if (G_interactive_fd) |
| 9447 | printf("[%u] %u %s\n", job->jobid, (unsigned)job->cmds[0].pid, job->cmdtext); |
| 9448 | G.last_jobid = job->jobid; |
| 9449 | } |
| 9450 | #endif /* JOB */ |
| 9451 | |
| 9452 | static int job_exited_or_stopped(struct pipe *pi) |
| 9453 | { |
| 9454 | int rcode, i; |
| 9455 | |
| 9456 | if (pi->alive_cmds != pi->stopped_cmds) |
| 9457 | return -1; |
| 9458 | |
| 9459 | /* All processes in fg pipe have exited or stopped */ |
| 9460 | rcode = 0; |
| 9461 | i = pi->num_cmds; |
| 9462 | while (--i >= 0) { |
| 9463 | rcode = pi->cmds[i].cmd_exitcode; |
| 9464 | /* usually last process gives overall exitstatus, |
| 9465 | * but with "set -o pipefail", last *failed* process does */ |
| 9466 | if (G.o_opt[OPT_O_PIPEFAIL] == 0 || rcode != 0) |
| 9467 | break; |
| 9468 | } |
| 9469 | IF_HAS_KEYWORDS(if (pi->pi_inverted) rcode = !rcode;) |
| 9470 | return rcode; |
| 9471 | } |
| 9472 | |
| 9473 | static int process_wait_result(struct pipe *fg_pipe, pid_t childpid, int status) |
| 9474 | { |
| 9475 | #if ENABLE_HUSH_JOB |
| 9476 | struct pipe *pi; |
| 9477 | #endif |
| 9478 | int i, dead; |
| 9479 | |
| 9480 | dead = WIFEXITED(status) || WIFSIGNALED(status); |
| 9481 | |
| 9482 | #if DEBUG_JOBS |
| 9483 | if (WIFSTOPPED(status)) |
| 9484 | debug_printf_jobs("pid %d stopped by sig %d (exitcode %d)\n", |
| 9485 | childpid, WSTOPSIG(status), WEXITSTATUS(status)); |
| 9486 | if (WIFSIGNALED(status)) |
| 9487 | debug_printf_jobs("pid %d killed by sig %d (exitcode %d)\n", |
| 9488 | childpid, WTERMSIG(status), WEXITSTATUS(status)); |
| 9489 | if (WIFEXITED(status)) |
| 9490 | debug_printf_jobs("pid %d exited, exitcode %d\n", |
| 9491 | childpid, WEXITSTATUS(status)); |
| 9492 | #endif |
| 9493 | /* Were we asked to wait for a fg pipe? */ |
| 9494 | if (fg_pipe) { |
| 9495 | i = fg_pipe->num_cmds; |
| 9496 | |
| 9497 | while (--i >= 0) { |
| 9498 | int rcode; |
| 9499 | |
| 9500 | debug_printf_jobs("check pid %d\n", fg_pipe->cmds[i].pid); |
| 9501 | if (fg_pipe->cmds[i].pid != childpid) |
| 9502 | continue; |
| 9503 | if (dead) { |
| 9504 | int ex; |
| 9505 | fg_pipe->cmds[i].pid = 0; |
| 9506 | fg_pipe->alive_cmds--; |
| 9507 | ex = WEXITSTATUS(status); |
| 9508 | /* bash prints killer signal's name for *last* |
| 9509 | * process in pipe (prints just newline for SIGINT/SIGPIPE). |
| 9510 | * Mimic this. Example: "sleep 5" + (^\ or kill -QUIT) |
| 9511 | */ |
| 9512 | if (WIFSIGNALED(status)) { |
| 9513 | int sig = WTERMSIG(status); |
| 9514 | #if ENABLE_HUSH_JOB |
| 9515 | if (G.run_list_level == 1 |
| 9516 | /* ^^^^^ Do not print in nested contexts, example: |
| 9517 | * echo `sleep 1; sh -c 'kill -9 $$'` - prints "137", NOT "Killed 137" |
| 9518 | */ |
| 9519 | && i == fg_pipe->num_cmds-1 |
| 9520 | ) { |
| 9521 | /* strsignal() is for bash compat. ~600 bloat versus bbox's get_signame() */ |
| 9522 | puts(sig == SIGINT || sig == SIGPIPE ? "" : strsignal(sig)); |
| 9523 | } |
| 9524 | #endif |
| 9525 | /* TODO: if (WCOREDUMP(status)) + " (core dumped)"; */ |
| 9526 | /* MIPS has 128 sigs (1..128), if sig==128, |
| 9527 | * 128 + sig would result in exitcode 256 -> 0! |
| 9528 | */ |
| 9529 | ex = 128 | sig; |
| 9530 | } |
| 9531 | fg_pipe->cmds[i].cmd_exitcode = ex; |
| 9532 | } else { |
| 9533 | fg_pipe->stopped_cmds++; |
| 9534 | } |
| 9535 | debug_printf_jobs("fg_pipe: alive_cmds %d stopped_cmds %d\n", |
| 9536 | fg_pipe->alive_cmds, fg_pipe->stopped_cmds); |
| 9537 | rcode = job_exited_or_stopped(fg_pipe); |
| 9538 | if (rcode >= 0) { |
| 9539 | /* Note: *non-interactive* bash does not continue if all processes in fg pipe |
| 9540 | * are stopped. Testcase: "cat | cat" in a script (not on command line!) |
| 9541 | * and "killall -STOP cat" */ |
| 9542 | if (G_interactive_fd) { |
| 9543 | #if ENABLE_HUSH_JOB |
| 9544 | if (fg_pipe->alive_cmds != 0) |
| 9545 | insert_job_into_table(fg_pipe); |
| 9546 | #endif |
| 9547 | return rcode; |
| 9548 | } |
| 9549 | if (fg_pipe->alive_cmds == 0) |
| 9550 | return rcode; |
| 9551 | } |
| 9552 | /* There are still running processes in the fg_pipe */ |
| 9553 | return -1; |
| 9554 | } |
| 9555 | /* It wasn't in fg_pipe, look for process in bg pipes */ |
| 9556 | } |
| 9557 | |
| 9558 | #if ENABLE_HUSH_JOB |
| 9559 | /* We were asked to wait for bg or orphaned children */ |
| 9560 | /* No need to remember exitcode in this case */ |
| 9561 | for (pi = G.job_list; pi; pi = pi->next) { |
| 9562 | for (i = 0; i < pi->num_cmds; i++) { |
| 9563 | if (pi->cmds[i].pid == childpid) |
| 9564 | goto found_pi_and_prognum; |
| 9565 | } |
| 9566 | } |
| 9567 | /* Happens when shell is used as init process (init=/bin/sh) */ |
| 9568 | debug_printf("checkjobs: pid %d was not in our list!\n", childpid); |
| 9569 | return -1; /* this wasn't a process from fg_pipe */ |
| 9570 | |
| 9571 | found_pi_and_prognum: |
| 9572 | if (dead) { |
| 9573 | /* child exited */ |
| 9574 | int rcode = WEXITSTATUS(status); |
| 9575 | if (WIFSIGNALED(status)) |
| 9576 | /* NB: not 128 + sig, MIPS has sig 128 */ |
| 9577 | rcode = 128 | WTERMSIG(status); |
| 9578 | pi->cmds[i].cmd_exitcode = rcode; |
| 9579 | if (G.last_bg_pid == pi->cmds[i].pid) |
| 9580 | G.last_bg_pid_exitcode = rcode; |
| 9581 | pi->cmds[i].pid = 0; |
| 9582 | pi->alive_cmds--; |
| 9583 | if (!pi->alive_cmds) { |
| 9584 | # if ENABLE_HUSH_BASH_COMPAT |
| 9585 | G.dead_job_exitcode = job_exited_or_stopped(pi); |
| 9586 | # endif |
| 9587 | if (G_interactive_fd) { |
| 9588 | printf(JOB_STATUS_FORMAT, pi->jobid, |
| 9589 | "Done", pi->cmdtext); |
| 9590 | delete_finished_job(pi); |
| 9591 | } else { |
| 9592 | /* |
| 9593 | * bash deletes finished jobs from job table only in interactive mode, |
| 9594 | * after "jobs" cmd, or if pid of a new process matches one of the old ones |
| 9595 | * (see cleanup_dead_jobs(), delete_old_job(), J_NOTIFIED in bash source). |
| 9596 | * Testcase script: "(exit 3) & sleep 1; wait %1; echo $?" prints 3 in bash. |
| 9597 | * We only retain one "dead" job, if it's the single job on the list. |
| 9598 | * This covers most of real-world scenarios where this is useful. |
| 9599 | */ |
| 9600 | if (pi != G.job_list) |
| 9601 | delete_finished_job(pi); |
| 9602 | } |
| 9603 | } |
| 9604 | } else { |
| 9605 | /* child stopped */ |
| 9606 | pi->stopped_cmds++; |
| 9607 | } |
| 9608 | #endif |
| 9609 | return -1; /* this wasn't a process from fg_pipe */ |
| 9610 | } |
| 9611 | |
| 9612 | /* Check to see if any processes have exited -- if they have, |
| 9613 | * figure out why and see if a job has completed. |
| 9614 | * |
| 9615 | * If non-NULL fg_pipe: wait for its completion or stop. |
| 9616 | * Return its exitcode or zero if stopped. |
| 9617 | * |
| 9618 | * Alternatively (fg_pipe == NULL, waitfor_pid != 0): |
| 9619 | * waitpid(WNOHANG), if waitfor_pid exits or stops, return exitcode+1, |
| 9620 | * else return <0 if waitpid errors out (e.g. ECHILD: nothing to wait for) |
| 9621 | * or 0 if no children changed status. |
| 9622 | * |
| 9623 | * Alternatively (fg_pipe == NULL, waitfor_pid == 0), |
| 9624 | * return <0 if waitpid errors out (e.g. ECHILD: nothing to wait for) |
| 9625 | * or 0 if no children changed status. |
| 9626 | */ |
| 9627 | static int checkjobs(struct pipe *fg_pipe, pid_t waitfor_pid) |
| 9628 | { |
| 9629 | int attributes; |
| 9630 | int status; |
| 9631 | int rcode = 0; |
| 9632 | |
| 9633 | debug_printf_jobs("checkjobs %p\n", fg_pipe); |
| 9634 | |
| 9635 | attributes = WUNTRACED; |
| 9636 | if (fg_pipe == NULL) |
| 9637 | attributes |= WNOHANG; |
| 9638 | |
| 9639 | errno = 0; |
| 9640 | #if ENABLE_HUSH_FAST |
| 9641 | if (G.handled_SIGCHLD == G.count_SIGCHLD) { |
| 9642 | //bb_error_msg("[%d] checkjobs: G.count_SIGCHLD:%d G.handled_SIGCHLD:%d children?:%d fg_pipe:%p", |
| 9643 | //getpid(), G.count_SIGCHLD, G.handled_SIGCHLD, G.we_have_children, fg_pipe); |
| 9644 | /* There was neither fork nor SIGCHLD since last waitpid */ |
| 9645 | /* Avoid doing waitpid syscall if possible */ |
| 9646 | if (!G.we_have_children) { |
| 9647 | errno = ECHILD; |
| 9648 | return -1; |
| 9649 | } |
| 9650 | if (fg_pipe == NULL) { /* is WNOHANG set? */ |
| 9651 | /* We have children, but they did not exit |
| 9652 | * or stop yet (we saw no SIGCHLD) */ |
| 9653 | return 0; |
| 9654 | } |
| 9655 | /* else: !WNOHANG, waitpid will block, can't short-circuit */ |
| 9656 | } |
| 9657 | #endif |
| 9658 | |
| 9659 | /* Do we do this right? |
| 9660 | * bash-3.00# sleep 20 | false |
| 9661 | * <ctrl-Z pressed> |
| 9662 | * [3]+ Stopped sleep 20 | false |
| 9663 | * bash-3.00# echo $? |
| 9664 | * 1 <========== bg pipe is not fully done, but exitcode is already known! |
| 9665 | * [hush 1.14.0: yes we do it right] |
| 9666 | */ |
| 9667 | while (1) { |
| 9668 | pid_t childpid; |
| 9669 | #if ENABLE_HUSH_FAST |
| 9670 | int i; |
| 9671 | i = G.count_SIGCHLD; |
| 9672 | #endif |
| 9673 | childpid = waitpid(-1, &status, attributes); |
| 9674 | if (childpid <= 0) { |
| 9675 | if (childpid && errno != ECHILD) |
| 9676 | bb_simple_perror_msg("waitpid"); |
| 9677 | #if ENABLE_HUSH_FAST |
| 9678 | else { /* Until next SIGCHLD, waitpid's are useless */ |
| 9679 | G.we_have_children = (childpid == 0); |
| 9680 | G.handled_SIGCHLD = i; |
| 9681 | //bb_error_msg("[%d] checkjobs: waitpid returned <= 0, G.count_SIGCHLD:%d G.handled_SIGCHLD:%d", getpid(), G.count_SIGCHLD, G.handled_SIGCHLD); |
| 9682 | } |
| 9683 | #endif |
| 9684 | /* ECHILD (no children), or 0 (no change in children status) */ |
| 9685 | rcode = childpid; |
| 9686 | break; |
| 9687 | } |
| 9688 | rcode = process_wait_result(fg_pipe, childpid, status); |
| 9689 | if (rcode >= 0) { |
| 9690 | /* fg_pipe exited or stopped */ |
| 9691 | break; |
| 9692 | } |
| 9693 | if (childpid == waitfor_pid) { /* "wait PID" */ |
| 9694 | debug_printf_exec("childpid==waitfor_pid:%d status:0x%08x\n", childpid, status); |
| 9695 | rcode = WEXITSTATUS(status); |
| 9696 | if (WIFSIGNALED(status)) |
| 9697 | rcode = 128 | WTERMSIG(status); |
| 9698 | if (WIFSTOPPED(status)) |
| 9699 | /* bash: "cmd & wait $!" and cmd stops: $? = 128 | stopsig */ |
| 9700 | rcode = 128 | WSTOPSIG(status); |
| 9701 | rcode++; |
| 9702 | break; /* "wait PID" called us, give it exitcode+1 */ |
| 9703 | } |
| 9704 | #if ENABLE_HUSH_BASH_COMPAT |
| 9705 | if (-1 == waitfor_pid /* "wait -n" (wait for any one job) */ |
| 9706 | && G.dead_job_exitcode >= 0 /* some job did finish */ |
| 9707 | ) { |
| 9708 | debug_printf_exec("waitfor_pid:-1\n"); |
| 9709 | rcode = G.dead_job_exitcode + 1; |
| 9710 | break; |
| 9711 | } |
| 9712 | #endif |
| 9713 | /* This wasn't one of our processes, or */ |
| 9714 | /* fg_pipe still has running processes, do waitpid again */ |
| 9715 | } /* while (waitpid succeeds)... */ |
| 9716 | |
| 9717 | return rcode; |
| 9718 | } |
| 9719 | |
| 9720 | #if ENABLE_HUSH_JOB |
| 9721 | static int checkjobs_and_fg_shell(struct pipe *fg_pipe) |
| 9722 | { |
| 9723 | pid_t p; |
| 9724 | int rcode = checkjobs(fg_pipe, 0 /*(no pid to wait for)*/); |
| 9725 | if (G_saved_tty_pgrp) { |
| 9726 | /* Job finished, move the shell to the foreground */ |
| 9727 | p = getpgrp(); /* our process group id */ |
| 9728 | debug_printf_jobs("fg'ing ourself: getpgrp()=%d\n", (int)p); |
| 9729 | tcsetpgrp(G_interactive_fd, p); |
| 9730 | } |
| 9731 | return rcode; |
| 9732 | } |
| 9733 | #endif |
| 9734 | |
| 9735 | /* Start all the jobs, but don't wait for anything to finish. |
| 9736 | * See checkjobs(). |
| 9737 | * |
| 9738 | * Return code is normally -1, when the caller has to wait for children |
| 9739 | * to finish to determine the exit status of the pipe. If the pipe |
| 9740 | * is a simple builtin command, however, the action is done by the |
| 9741 | * time run_pipe returns, and the exit code is provided as the |
| 9742 | * return value. |
| 9743 | * |
| 9744 | * Returns -1 only if started some children. IOW: we have to |
| 9745 | * mask out retvals of builtins etc with 0xff! |
| 9746 | * |
| 9747 | * The only case when we do not need to [v]fork is when the pipe |
| 9748 | * is single, non-backgrounded, non-subshell command. Examples: |
| 9749 | * cmd ; ... { list } ; ... |
| 9750 | * cmd && ... { list } && ... |
| 9751 | * cmd || ... { list } || ... |
| 9752 | * If it is, then we can run cmd as a builtin, NOFORK, |
| 9753 | * or (if SH_STANDALONE) an applet, and we can run the { list } |
| 9754 | * with run_list. If it isn't one of these, we fork and exec cmd. |
| 9755 | * |
| 9756 | * Cases when we must fork: |
| 9757 | * non-single: cmd | cmd |
| 9758 | * backgrounded: cmd & { list } & |
| 9759 | * subshell: ( list ) [&] |
| 9760 | */ |
| 9761 | #if !ENABLE_HUSH_MODE_X |
| 9762 | #define redirect_and_varexp_helper(command, sqp, argv_expanded) \ |
| 9763 | redirect_and_varexp_helper(command, sqp) |
| 9764 | #endif |
| 9765 | static int redirect_and_varexp_helper( |
| 9766 | struct command *command, |
| 9767 | struct squirrel **sqp, |
| 9768 | char **argv_expanded) |
| 9769 | { |
| 9770 | /* Assignments occur before redirects. Try: |
| 9771 | * a=`sleep 1` sleep 2 3>/qwe/rty |
| 9772 | */ |
| 9773 | |
| 9774 | char **new_env = expand_assignments(command->argv, command->assignment_cnt); |
| 9775 | dump_cmd_in_x_mode(new_env); |
| 9776 | dump_cmd_in_x_mode(argv_expanded); |
| 9777 | /* this takes ownership of new_env[i] elements, and frees new_env: */ |
| 9778 | set_vars_and_save_old(new_env); |
| 9779 | |
| 9780 | return setup_redirects(command, sqp); |
| 9781 | } |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 9782 | #endif /* !__U_BOOT__ */ |
| 9783 | |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 9784 | static NOINLINE int run_pipe(struct pipe *pi) |
| 9785 | { |
| 9786 | static const char *const null_ptr = NULL; |
| 9787 | |
| 9788 | int cmd_no; |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 9789 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 9790 | int next_infd; |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 9791 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 9792 | struct command *command; |
| 9793 | char **argv_expanded; |
| 9794 | char **argv; |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 9795 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 9796 | struct squirrel *squirrel = NULL; |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 9797 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 9798 | int rcode; |
| 9799 | |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 9800 | #ifdef __U_BOOT__ |
| 9801 | /* |
| 9802 | * Set rcode here to avoid returning a garbage value in the middle of |
| 9803 | * the function. |
| 9804 | * Also, if an error occurs, rcode value would be changed and last |
| 9805 | * return will signal the error. |
| 9806 | */ |
| 9807 | rcode = 0; |
| 9808 | #endif /* __U_BOOT__ */ |
| 9809 | |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 9810 | debug_printf_exec("run_pipe start: members:%d\n", pi->num_cmds); |
| 9811 | debug_enter(); |
| 9812 | |
| 9813 | /* Testcase: set -- q w e; (IFS='' echo "$*"; IFS=''; echo "$*"); echo "$*" |
| 9814 | * Result should be 3 lines: q w e, qwe, q w e |
| 9815 | */ |
| 9816 | if (G.ifs_whitespace != G.ifs) |
| 9817 | free(G.ifs_whitespace); |
| 9818 | G.ifs = get_local_var_value("IFS"); |
| 9819 | if (G.ifs) { |
| 9820 | char *p; |
| 9821 | G.ifs_whitespace = (char*)G.ifs; |
| 9822 | p = skip_whitespace(G.ifs); |
| 9823 | if (*p) { |
| 9824 | /* Not all $IFS is whitespace */ |
| 9825 | char *d; |
| 9826 | int len = p - G.ifs; |
| 9827 | p = skip_non_whitespace(p); |
| 9828 | G.ifs_whitespace = xmalloc(len + strlen(p) + 1); /* can overestimate */ |
| 9829 | d = mempcpy(G.ifs_whitespace, G.ifs, len); |
| 9830 | while (*p) { |
| 9831 | if (isspace(*p)) |
| 9832 | *d++ = *p; |
| 9833 | p++; |
| 9834 | } |
| 9835 | *d = '\0'; |
| 9836 | } |
| 9837 | } else { |
| 9838 | G.ifs = defifs; |
| 9839 | G.ifs_whitespace = (char*)G.ifs; |
| 9840 | } |
| 9841 | |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 9842 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 9843 | IF_HUSH_JOB(pi->pgrp = -1;) |
| 9844 | pi->stopped_cmds = 0; |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 9845 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 9846 | command = &pi->cmds[0]; |
| 9847 | argv_expanded = NULL; |
| 9848 | |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 9849 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 9850 | if (pi->num_cmds != 1 |
| 9851 | || pi->followup == PIPE_BG |
| 9852 | || command->cmd_type == CMD_SUBSHELL |
| 9853 | ) { |
| 9854 | goto must_fork; |
| 9855 | } |
| 9856 | |
| 9857 | pi->alive_cmds = 1; |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 9858 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 9859 | |
| 9860 | debug_printf_exec(": group:%p argv:'%s'\n", |
| 9861 | command->group, command->argv ? command->argv[0] : "NONE"); |
| 9862 | |
| 9863 | if (command->group) { |
| 9864 | #if ENABLE_HUSH_FUNCTIONS |
| 9865 | if (command->cmd_type == CMD_FUNCDEF) { |
| 9866 | /* "executing" func () { list } */ |
| 9867 | struct function *funcp; |
| 9868 | |
| 9869 | funcp = new_function(command->argv[0]); |
| 9870 | /* funcp->name is already set to argv[0] */ |
| 9871 | funcp->body = command->group; |
| 9872 | # if !BB_MMU |
| 9873 | funcp->body_as_string = command->group_as_string; |
| 9874 | command->group_as_string = NULL; |
| 9875 | # endif |
| 9876 | command->group = NULL; |
| 9877 | command->argv[0] = NULL; |
| 9878 | debug_printf_exec("cmd %p has child func at %p\n", command, funcp); |
| 9879 | funcp->parent_cmd = command; |
| 9880 | command->child_func = funcp; |
| 9881 | |
| 9882 | debug_printf_exec("run_pipe: return EXIT_SUCCESS\n"); |
| 9883 | debug_leave(); |
| 9884 | return EXIT_SUCCESS; |
| 9885 | } |
| 9886 | #endif |
| 9887 | /* { list } */ |
| 9888 | debug_printf_exec("non-subshell group\n"); |
| 9889 | rcode = 1; /* exitcode if redir failed */ |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 9890 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 9891 | if (setup_redirects(command, &squirrel) == 0) { |
Francis Laniel | 374b77e | 2023-12-22 22:02:39 +0100 | [diff] [blame] | 9892 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 9893 | debug_printf_exec(": run_list\n"); |
| 9894 | //FIXME: we need to pass squirrel down into run_list() |
| 9895 | //for SH_STANDALONE case, or else this construct: |
| 9896 | // { find /proc/self/fd; true; } >FILE; cmd2 |
| 9897 | //has no way of closing saved fd#1 for "find", |
| 9898 | //and in SH_STANDALONE mode, "find" is not execed, |
| 9899 | //therefore CLOEXEC on saved fd does not help. |
| 9900 | rcode = run_list(command->group) & 0xff; |
Francis Laniel | 374b77e | 2023-12-22 22:02:39 +0100 | [diff] [blame] | 9901 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 9902 | } |
| 9903 | restore_redirects(squirrel); |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 9904 | #endif /* !__U_BOOT__ */ |
Francis Laniel | 374b77e | 2023-12-22 22:02:39 +0100 | [diff] [blame] | 9905 | IF_HAS_KEYWORDS(if (pi->pi_inverted) rcode = !rcode;) |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 9906 | debug_leave(); |
| 9907 | debug_printf_exec("run_pipe: return %d\n", rcode); |
| 9908 | return rcode; |
| 9909 | } |
| 9910 | |
| 9911 | argv = command->argv ? command->argv : (char **) &null_ptr; |
| 9912 | { |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 9913 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 9914 | const struct built_in_command *x; |
| 9915 | IF_HUSH_FUNCTIONS(const struct function *funcp;) |
| 9916 | IF_NOT_HUSH_FUNCTIONS(enum { funcp = 0 };) |
| 9917 | struct variable **sv_shadowed; |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 9918 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 9919 | struct variable *old_vars; |
| 9920 | |
| 9921 | #if ENABLE_HUSH_LINENO_VAR |
| 9922 | G.execute_lineno = command->lineno; |
| 9923 | #endif |
| 9924 | |
| 9925 | if (argv[command->assignment_cnt] == NULL) { |
| 9926 | /* Assignments, but no command. |
| 9927 | * Ensure redirects take effect (that is, create files). |
| 9928 | * Try "a=t >file" |
| 9929 | */ |
| 9930 | unsigned i; |
| 9931 | G.expand_exitcode = 0; |
| 9932 | only_assignments: |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 9933 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 9934 | rcode = setup_redirects(command, &squirrel); |
| 9935 | restore_redirects(squirrel); |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 9936 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 9937 | |
| 9938 | /* Set shell variables */ |
| 9939 | i = 0; |
| 9940 | while (i < command->assignment_cnt) { |
| 9941 | char *p = expand_string_to_string(argv[i], |
| 9942 | EXP_FLAG_ESC_GLOB_CHARS, |
| 9943 | /*unbackslash:*/ 1 |
| 9944 | ); |
| 9945 | #if ENABLE_HUSH_MODE_X |
| 9946 | if (G_x_mode) { |
| 9947 | char *eq; |
| 9948 | if (i == 0) |
| 9949 | x_mode_prefix(); |
| 9950 | x_mode_addchr(' '); |
| 9951 | eq = strchrnul(p, '='); |
| 9952 | if (*eq) eq++; |
| 9953 | x_mode_addblock(p, (eq - p)); |
| 9954 | x_mode_print_optionally_squoted(eq); |
| 9955 | x_mode_flush(); |
| 9956 | } |
| 9957 | #endif |
| 9958 | debug_printf_env("set shell var:'%s'->'%s'\n", *argv, p); |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 9959 | #ifndef __U_BOOT__ |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 9960 | if (set_local_var0(p)) { |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 9961 | #else /* __U_BOOT__ */ |
| 9962 | if (set_local_var_modern(p, /*flag:*/ 0)) { |
| 9963 | #endif |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 9964 | /* assignment to readonly var / putenv error? */ |
| 9965 | rcode = 1; |
| 9966 | } |
| 9967 | i++; |
| 9968 | } |
| 9969 | /* Redirect error sets $? to 1. Otherwise, |
| 9970 | * if evaluating assignment value set $?, retain it. |
| 9971 | * Else, clear $?: |
| 9972 | * false; q=`exit 2`; echo $? - should print 2 |
| 9973 | * false; x=1; echo $? - should print 0 |
| 9974 | * Because of the 2nd case, we can't just use G.last_exitcode. |
| 9975 | */ |
| 9976 | if (rcode == 0) |
| 9977 | rcode = G.expand_exitcode; |
| 9978 | IF_HAS_KEYWORDS(if (pi->pi_inverted) rcode = !rcode;) |
| 9979 | debug_leave(); |
| 9980 | debug_printf_exec("run_pipe: return %d\n", rcode); |
| 9981 | return rcode; |
| 9982 | } |
| 9983 | |
| 9984 | /* Expand the rest into (possibly) many strings each */ |
| 9985 | #if defined(CMD_TEST2_SINGLEWORD_NOGLOB) |
| 9986 | if (command->cmd_type == CMD_TEST2_SINGLEWORD_NOGLOB) |
| 9987 | argv_expanded = expand_strvec_to_strvec_singleword_noglob(argv + command->assignment_cnt); |
| 9988 | else |
| 9989 | #endif |
| 9990 | #if defined(CMD_SINGLEWORD_NOGLOB) |
| 9991 | if (command->cmd_type == CMD_SINGLEWORD_NOGLOB) |
| 9992 | argv_expanded = expand_strvec_to_strvec_singleword_noglob(argv + command->assignment_cnt); |
| 9993 | else |
| 9994 | #endif |
| 9995 | argv_expanded = expand_strvec_to_strvec(argv + command->assignment_cnt); |
| 9996 | |
| 9997 | /* If someone gives us an empty string: `cmd with empty output` */ |
| 9998 | if (!argv_expanded[0]) { |
| 9999 | free(argv_expanded); |
| 10000 | /* `false` still has to set exitcode 1 */ |
| 10001 | G.expand_exitcode = G.last_exitcode; |
| 10002 | goto only_assignments; |
| 10003 | } |
| 10004 | |
| 10005 | old_vars = NULL; |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 10006 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 10007 | sv_shadowed = G.shadowed_vars_pp; |
| 10008 | |
| 10009 | /* Check if argv[0] matches any functions (this goes before bltins) */ |
| 10010 | IF_HUSH_FUNCTIONS(funcp = find_function(argv_expanded[0]);) |
| 10011 | IF_HUSH_FUNCTIONS(x = NULL;) |
| 10012 | IF_HUSH_FUNCTIONS(if (!funcp)) |
| 10013 | x = find_builtin(argv_expanded[0]); |
| 10014 | if (x || funcp) { |
| 10015 | if (x && x->b_function == builtin_exec && argv_expanded[1] == NULL) { |
| 10016 | debug_printf("exec with redirects only\n"); |
| 10017 | /* |
| 10018 | * Variable assignments are executed, but then "forgotten": |
| 10019 | * a=`sleep 1;echo A` exec 3>&-; echo $a |
| 10020 | * sleeps, but prints nothing. |
| 10021 | */ |
| 10022 | enter_var_nest_level(); |
| 10023 | G.shadowed_vars_pp = &old_vars; |
| 10024 | rcode = redirect_and_varexp_helper(command, |
| 10025 | /*squirrel:*/ ERR_PTR, |
| 10026 | argv_expanded |
| 10027 | ); |
| 10028 | G.shadowed_vars_pp = sv_shadowed; |
| 10029 | /* rcode=1 can be if redir file can't be opened */ |
| 10030 | |
| 10031 | goto clean_up_and_ret1; |
| 10032 | } |
| 10033 | |
| 10034 | /* Bump var nesting, or this will leak exported $a: |
| 10035 | * a=b true; env | grep ^a= |
| 10036 | */ |
| 10037 | enter_var_nest_level(); |
| 10038 | /* Collect all variables "shadowed" by helper |
| 10039 | * (IOW: old vars overridden by "var1=val1 var2=val2 cmd..." syntax) |
| 10040 | * into old_vars list: |
| 10041 | */ |
| 10042 | G.shadowed_vars_pp = &old_vars; |
| 10043 | rcode = redirect_and_varexp_helper(command, &squirrel, argv_expanded); |
| 10044 | if (rcode == 0) { |
| 10045 | if (!funcp) { |
| 10046 | /* Do not collect *to old_vars list* vars shadowed |
| 10047 | * by e.g. "local VAR" builtin (collect them |
| 10048 | * in the previously nested list instead): |
| 10049 | * don't want them to be restored immediately |
| 10050 | * after "local" completes. |
| 10051 | */ |
| 10052 | G.shadowed_vars_pp = sv_shadowed; |
| 10053 | |
| 10054 | debug_printf_exec(": builtin '%s' '%s'...\n", |
| 10055 | x->b_cmd, argv_expanded[1]); |
| 10056 | fflush_all(); |
| 10057 | rcode = x->b_function(argv_expanded) & 0xff; |
| 10058 | fflush_all(); |
| 10059 | } |
| 10060 | #if ENABLE_HUSH_FUNCTIONS |
| 10061 | else { |
| 10062 | debug_printf_exec(": function '%s' '%s'...\n", |
| 10063 | funcp->name, argv_expanded[1]); |
| 10064 | rcode = run_function(funcp, argv_expanded) & 0xff; |
| 10065 | /* |
| 10066 | * But do collect *to old_vars list* vars shadowed |
| 10067 | * within function execution. To that end, restore |
| 10068 | * this pointer _after_ function run: |
| 10069 | */ |
| 10070 | G.shadowed_vars_pp = sv_shadowed; |
| 10071 | } |
| 10072 | #endif |
| 10073 | } |
| 10074 | } else |
| 10075 | if (ENABLE_FEATURE_SH_NOFORK && NUM_APPLETS > 1) { |
| 10076 | int n = find_applet_by_name(argv_expanded[0]); |
| 10077 | if (n < 0 || !APPLET_IS_NOFORK(n)) |
| 10078 | goto must_fork; |
| 10079 | |
| 10080 | enter_var_nest_level(); |
| 10081 | /* Collect all variables "shadowed" by helper into old_vars list */ |
| 10082 | G.shadowed_vars_pp = &old_vars; |
| 10083 | rcode = redirect_and_varexp_helper(command, &squirrel, argv_expanded); |
| 10084 | G.shadowed_vars_pp = sv_shadowed; |
| 10085 | |
| 10086 | if (rcode == 0) { |
| 10087 | debug_printf_exec(": run_nofork_applet '%s' '%s'...\n", |
| 10088 | argv_expanded[0], argv_expanded[1]); |
| 10089 | /* |
| 10090 | * Note: signals (^C) can't interrupt here. |
| 10091 | * We remember them and they will be acted upon |
| 10092 | * after applet returns. |
| 10093 | * This makes applets which can run for a long time |
| 10094 | * and/or wait for user input ineligible for NOFORK: |
| 10095 | * for example, "yes" or "rm" (rm -i waits for input). |
| 10096 | */ |
| 10097 | rcode = run_nofork_applet(n, argv_expanded); |
| 10098 | } |
| 10099 | } else |
| 10100 | goto must_fork; |
| 10101 | |
| 10102 | restore_redirects(squirrel); |
| 10103 | clean_up_and_ret1: |
| 10104 | leave_var_nest_level(); |
| 10105 | add_vars(old_vars); |
| 10106 | |
| 10107 | /* |
| 10108 | * Try "usleep 99999999" + ^C + "echo $?" |
| 10109 | * with FEATURE_SH_NOFORK=y. |
| 10110 | */ |
| 10111 | if (!funcp) { |
| 10112 | /* It was builtin or nofork. |
| 10113 | * if this would be a real fork/execed program, |
| 10114 | * it should have died if a fatal sig was received. |
| 10115 | * But OTOH, there was no separate process, |
| 10116 | * the sig was sent to _shell_, not to non-existing |
| 10117 | * child. |
| 10118 | * Let's just handle ^C only, this one is obvious: |
| 10119 | * we aren't ok with exitcode 0 when ^C was pressed |
| 10120 | * during builtin/nofork. |
| 10121 | */ |
| 10122 | if (sigismember(&G.pending_set, SIGINT)) |
| 10123 | rcode = 128 | SIGINT; |
| 10124 | } |
| 10125 | free(argv_expanded); |
| 10126 | IF_HAS_KEYWORDS(if (pi->pi_inverted) rcode = !rcode;) |
| 10127 | debug_leave(); |
| 10128 | debug_printf_exec("run_pipe return %d\n", rcode); |
| 10129 | return rcode; |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 10130 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 10131 | } |
| 10132 | |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 10133 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 10134 | must_fork: |
| 10135 | /* NB: argv_expanded may already be created, and that |
| 10136 | * might include `cmd` runs! Do not rerun it! We *must* |
| 10137 | * use argv_expanded if it's non-NULL */ |
| 10138 | |
| 10139 | /* Going to fork a child per each pipe member */ |
| 10140 | pi->alive_cmds = 0; |
| 10141 | next_infd = 0; |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 10142 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 10143 | |
| 10144 | cmd_no = 0; |
| 10145 | while (cmd_no < pi->num_cmds) { |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 10146 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 10147 | struct fd_pair pipefds; |
| 10148 | #if !BB_MMU |
| 10149 | int sv_var_nest_level = G.var_nest_level; |
| 10150 | volatile nommu_save_t nommu_save; |
| 10151 | nommu_save.old_vars = NULL; |
| 10152 | nommu_save.argv = NULL; |
| 10153 | nommu_save.argv_from_re_execing = NULL; |
| 10154 | #endif |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 10155 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 10156 | command = &pi->cmds[cmd_no]; |
| 10157 | cmd_no++; |
Francis Laniel | 74e4254 | 2023-12-22 22:02:33 +0100 | [diff] [blame] | 10158 | |
| 10159 | #ifdef __U_BOOT__ |
| 10160 | /* Replace argv and argc by expanded if it exists. */ |
| 10161 | if (argv_expanded) { |
| 10162 | /* |
| 10163 | * We need to save a pointer to argv, we will restore it |
| 10164 | * later, so it will be freed when pipe is freed. |
| 10165 | */ |
| 10166 | argv = command->argv; |
| 10167 | |
| 10168 | /* |
| 10169 | * After expansion, there can be more or less argument, so we need to |
| 10170 | * update argc, for example: |
| 10171 | * - More arguments: |
| 10172 | * foo='bar quuz' |
| 10173 | * echo $foo |
| 10174 | * - Less arguments: |
| 10175 | * echo $foo (if foo was never set) |
| 10176 | */ |
| 10177 | command->argc = list_size(argv_expanded); |
| 10178 | command->argv = argv_expanded; |
| 10179 | } |
| 10180 | #endif /* __U_BOOT__ */ |
| 10181 | if (command->argv) { |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 10182 | debug_printf_exec(": pipe member '%s' '%s'...\n", |
| 10183 | command->argv[0], command->argv[1]); |
| 10184 | } else { |
| 10185 | debug_printf_exec(": pipe member with no argv\n"); |
| 10186 | } |
| 10187 | |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 10188 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 10189 | /* pipes are inserted between pairs of commands */ |
| 10190 | pipefds.rd = 0; |
| 10191 | pipefds.wr = 1; |
| 10192 | if (cmd_no < pi->num_cmds) |
| 10193 | xpiped_pair(pipefds); |
| 10194 | |
| 10195 | #if ENABLE_HUSH_LINENO_VAR |
| 10196 | G.execute_lineno = command->lineno; |
| 10197 | #endif |
| 10198 | |
| 10199 | command->pid = BB_MMU ? fork() : vfork(); |
| 10200 | if (!command->pid) { /* child */ |
| 10201 | #if ENABLE_HUSH_JOB |
| 10202 | disable_restore_tty_pgrp_on_exit(); |
| 10203 | CLEAR_RANDOM_T(&G.random_gen); /* or else $RANDOM repeats in child */ |
| 10204 | |
| 10205 | /* Every child adds itself to new process group |
| 10206 | * with pgid == pid_of_first_child_in_pipe */ |
| 10207 | if (G.run_list_level == 1 && G_interactive_fd) { |
| 10208 | pid_t pgrp; |
| 10209 | pgrp = pi->pgrp; |
| 10210 | if (pgrp < 0) /* true for 1st process only */ |
| 10211 | pgrp = getpid(); |
| 10212 | if (setpgid(0, pgrp) == 0 |
| 10213 | && pi->followup != PIPE_BG |
| 10214 | && G_saved_tty_pgrp /* we have ctty */ |
| 10215 | ) { |
| 10216 | /* We do it in *every* child, not just first, |
| 10217 | * to avoid races */ |
| 10218 | tcsetpgrp(G_interactive_fd, pgrp); |
| 10219 | } |
| 10220 | } |
| 10221 | #endif |
| 10222 | if (pi->alive_cmds == 0 && pi->followup == PIPE_BG) { |
| 10223 | /* 1st cmd in backgrounded pipe |
| 10224 | * should have its stdin /dev/null'ed */ |
| 10225 | close(0); |
| 10226 | if (open(bb_dev_null, O_RDONLY)) |
| 10227 | xopen("/", O_RDONLY); |
| 10228 | } else { |
| 10229 | xmove_fd(next_infd, 0); |
| 10230 | } |
| 10231 | xmove_fd(pipefds.wr, 1); |
| 10232 | if (pipefds.rd > 1) |
| 10233 | close(pipefds.rd); |
| 10234 | /* Like bash, explicit redirects override pipes, |
| 10235 | * and the pipe fd (fd#1) is available for dup'ing: |
| 10236 | * "cmd1 2>&1 | cmd2": fd#1 is duped to fd#2, thus stderr |
| 10237 | * of cmd1 goes into pipe. |
| 10238 | */ |
| 10239 | if (setup_redirects(command, NULL)) { |
| 10240 | /* Happens when redir file can't be opened: |
| 10241 | * $ hush -c 'echo FOO >&2 | echo BAR 3>/qwe/rty; echo BAZ' |
| 10242 | * FOO |
| 10243 | * hush: can't open '/qwe/rty': No such file or directory |
| 10244 | * BAZ |
| 10245 | * (echo BAR is not executed, it hits _exit(1) below) |
| 10246 | */ |
| 10247 | _exit(1); |
| 10248 | } |
| 10249 | |
| 10250 | /* Stores to nommu_save list of env vars putenv'ed |
| 10251 | * (NOMMU, on MMU we don't need that) */ |
| 10252 | /* cast away volatility... */ |
| 10253 | pseudo_exec((nommu_save_t*) &nommu_save, command, argv_expanded); |
| 10254 | /* pseudo_exec() does not return */ |
| 10255 | } |
| 10256 | |
| 10257 | /* parent or error */ |
| 10258 | #if ENABLE_HUSH_FAST |
| 10259 | G.count_SIGCHLD++; |
| 10260 | //bb_error_msg("[%d] fork in run_pipe: G.count_SIGCHLD:%d G.handled_SIGCHLD:%d", getpid(), G.count_SIGCHLD, G.handled_SIGCHLD); |
| 10261 | #endif |
| 10262 | enable_restore_tty_pgrp_on_exit(); |
| 10263 | #if !BB_MMU |
| 10264 | /* Clean up after vforked child */ |
| 10265 | free(nommu_save.argv); |
| 10266 | free(nommu_save.argv_from_re_execing); |
| 10267 | G.var_nest_level = sv_var_nest_level; |
| 10268 | remove_nested_vars(); |
| 10269 | add_vars(nommu_save.old_vars); |
| 10270 | #endif |
| 10271 | free(argv_expanded); |
| 10272 | argv_expanded = NULL; |
| 10273 | if (command->pid < 0) { /* [v]fork failed */ |
| 10274 | /* Clearly indicate, was it fork or vfork */ |
| 10275 | bb_simple_perror_msg(BB_MMU ? "vfork"+1 : "vfork"); |
| 10276 | } else { |
| 10277 | pi->alive_cmds++; |
| 10278 | #if ENABLE_HUSH_JOB |
| 10279 | /* Second and next children need to know pid of first one */ |
| 10280 | if (pi->pgrp < 0) |
| 10281 | pi->pgrp = command->pid; |
| 10282 | #endif |
| 10283 | } |
| 10284 | |
| 10285 | if (cmd_no > 1) |
| 10286 | close(next_infd); |
| 10287 | if (cmd_no < pi->num_cmds) |
| 10288 | close(pipefds.wr); |
| 10289 | /* Pass read (output) pipe end to next iteration */ |
| 10290 | next_infd = pipefds.rd; |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 10291 | #else /* __U_BOOT__ */ |
| 10292 | /* Process the command */ |
| 10293 | rcode = cmd_process(G.do_repeat ? CMD_FLAG_REPEAT : 0, |
| 10294 | command->argc, command->argv, |
| 10295 | &(G.flag_repeat), NULL); |
Francis Laniel | 74e4254 | 2023-12-22 22:02:33 +0100 | [diff] [blame] | 10296 | |
| 10297 | if (argv_expanded) { |
| 10298 | /* |
| 10299 | * expand_strvec_to_strvec() allocates memory to expand |
| 10300 | * argv, we need to free it. |
| 10301 | */ |
| 10302 | free(argv_expanded); |
| 10303 | |
| 10304 | /* |
| 10305 | * We also restore command->argv to its original value |
| 10306 | * so no memory leak happens. |
| 10307 | */ |
| 10308 | command->argv = argv; |
| 10309 | |
| 10310 | /* |
| 10311 | * NOTE argc exists only in U-Boot, so argv freeing does |
| 10312 | * not rely on it as this code exists in BusyBox. |
| 10313 | */ |
| 10314 | } |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 10315 | #endif /* __U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 10316 | } |
| 10317 | |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 10318 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 10319 | if (!pi->alive_cmds) { |
| 10320 | debug_leave(); |
| 10321 | debug_printf_exec("run_pipe return 1 (all forks failed, no children)\n"); |
| 10322 | return 1; |
| 10323 | } |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 10324 | #endif /* __U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 10325 | |
| 10326 | debug_leave(); |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 10327 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 10328 | debug_printf_exec("run_pipe return -1 (%u children started)\n", pi->alive_cmds); |
| 10329 | return -1; |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 10330 | #else /* __U_BOOT__ */ |
| 10331 | debug_printf_exec("run_pipe return %d\n", rcode); |
| 10332 | return rcode; |
| 10333 | #endif /* __U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 10334 | } |
| 10335 | |
| 10336 | /* NB: called by pseudo_exec, and therefore must not modify any |
| 10337 | * global data until exec/_exit (we can be a child after vfork!) */ |
| 10338 | static int run_list(struct pipe *pi) |
| 10339 | { |
| 10340 | #if ENABLE_HUSH_CASE |
| 10341 | char *case_word = NULL; |
| 10342 | #endif |
| 10343 | #if ENABLE_HUSH_LOOPS |
| 10344 | struct pipe *loop_top = NULL; |
| 10345 | char **for_lcur = NULL; |
| 10346 | char **for_list = NULL; |
| 10347 | #endif |
| 10348 | smallint last_followup; |
| 10349 | smalluint rcode; |
| 10350 | #if ENABLE_HUSH_IF || ENABLE_HUSH_CASE |
| 10351 | smalluint cond_code = 0; |
| 10352 | #else |
| 10353 | enum { cond_code = 0 }; |
| 10354 | #endif |
| 10355 | #if HAS_KEYWORDS |
| 10356 | smallint rword; /* RES_foo */ |
| 10357 | smallint last_rword; /* ditto */ |
| 10358 | #endif |
| 10359 | |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 10360 | #ifndef __U_BOOT__ |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 10361 | debug_printf_exec("run_list lvl %d start\n", G.run_list_level); |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 10362 | debug_enter(); |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 10363 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 10364 | |
| 10365 | #if ENABLE_HUSH_LOOPS |
| 10366 | /* Check syntax for "for" */ |
| 10367 | { |
| 10368 | struct pipe *cpipe; |
| 10369 | for (cpipe = pi; cpipe; cpipe = cpipe->next) { |
| 10370 | if (cpipe->res_word != RES_FOR && cpipe->res_word != RES_IN) |
| 10371 | continue; |
| 10372 | /* current word is FOR or IN (BOLD in comments below) */ |
| 10373 | if (cpipe->next == NULL) { |
| 10374 | syntax_error("malformed for"); |
| 10375 | debug_leave(); |
| 10376 | debug_printf_exec("run_list lvl %d return 1\n", G.run_list_level); |
| 10377 | return 1; |
| 10378 | } |
| 10379 | /* "FOR v; do ..." and "for v IN a b; do..." are ok */ |
| 10380 | if (cpipe->next->res_word == RES_DO) |
| 10381 | continue; |
| 10382 | /* next word is not "do". It must be "in" then ("FOR v in ...") */ |
| 10383 | if (cpipe->res_word == RES_IN /* "for v IN a b; not_do..."? */ |
| 10384 | || cpipe->next->res_word != RES_IN /* FOR v not_do_and_not_in..."? */ |
| 10385 | ) { |
| 10386 | syntax_error("malformed for"); |
| 10387 | debug_leave(); |
| 10388 | debug_printf_exec("run_list lvl %d return 1\n", G.run_list_level); |
| 10389 | return 1; |
| 10390 | } |
| 10391 | } |
| 10392 | } |
| 10393 | #endif |
| 10394 | |
| 10395 | /* Past this point, all code paths should jump to ret: label |
| 10396 | * in order to return, no direct "return" statements please. |
| 10397 | * This helps to ensure that no memory is leaked. */ |
| 10398 | |
| 10399 | #if ENABLE_HUSH_JOB |
| 10400 | G.run_list_level++; |
| 10401 | #endif |
| 10402 | |
| 10403 | #if HAS_KEYWORDS |
| 10404 | rword = RES_NONE; |
| 10405 | last_rword = RES_XXXX; |
| 10406 | #endif |
| 10407 | last_followup = PIPE_SEQ; |
| 10408 | rcode = G.last_exitcode; |
| 10409 | |
| 10410 | /* Go through list of pipes, (maybe) executing them. */ |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 10411 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 10412 | for (; pi; pi = IF_HUSH_LOOPS(rword == RES_DONE ? loop_top : ) pi->next) { |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 10413 | #else /* __U_BOOT__ */ |
Francis Laniel | e252f50 | 2023-12-22 22:02:40 +0100 | [diff] [blame] | 10414 | for (; pi; pi = rword == RES_DONE ? loop_top : pi->next) { |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 10415 | #endif /* __U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 10416 | int r; |
| 10417 | int sv_errexit_depth; |
| 10418 | |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 10419 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 10420 | if (G.flag_SIGINT) |
| 10421 | break; |
| 10422 | if (G_flag_return_in_progress == 1) |
| 10423 | break; |
Francis Laniel | 374b77e | 2023-12-22 22:02:39 +0100 | [diff] [blame] | 10424 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 10425 | |
| 10426 | IF_HAS_KEYWORDS(rword = pi->res_word;) |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 10427 | debug_printf_exec(": rword:%d cond_code:%d last_rword:%d\n", |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 10428 | rword, cond_code, last_rword); |
| 10429 | |
| 10430 | sv_errexit_depth = G.errexit_depth; |
| 10431 | if ( |
| 10432 | #if ENABLE_HUSH_IF |
| 10433 | rword == RES_IF || rword == RES_ELIF || |
| 10434 | #endif |
| 10435 | pi->followup != PIPE_SEQ |
| 10436 | ) { |
| 10437 | G.errexit_depth++; |
| 10438 | } |
| 10439 | #if ENABLE_HUSH_LOOPS |
| 10440 | if ((rword == RES_WHILE || rword == RES_UNTIL || rword == RES_FOR) |
| 10441 | && loop_top == NULL /* avoid bumping G.depth_of_loop twice */ |
| 10442 | ) { |
| 10443 | /* start of a loop: remember where loop starts */ |
| 10444 | loop_top = pi; |
| 10445 | G.depth_of_loop++; |
| 10446 | } |
| 10447 | #endif |
| 10448 | /* Still in the same "if...", "then..." or "do..." branch? */ |
| 10449 | if (IF_HAS_KEYWORDS(rword == last_rword &&) 1) { |
| 10450 | if ((rcode == 0 && last_followup == PIPE_OR) |
| 10451 | || (rcode != 0 && last_followup == PIPE_AND) |
| 10452 | ) { |
| 10453 | /* It is "<true> || CMD" or "<false> && CMD" |
| 10454 | * and we should not execute CMD */ |
| 10455 | debug_printf_exec("skipped cmd because of || or &&\n"); |
| 10456 | last_followup = pi->followup; |
| 10457 | goto dont_check_jobs_but_continue; |
| 10458 | } |
| 10459 | } |
| 10460 | last_followup = pi->followup; |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 10461 | #if ENABLE_HUSH_IF |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 10462 | if (cond_code != 0) { |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 10463 | if (rword == RES_THEN) { |
| 10464 | /* if false; then ... fi has exitcode 0! */ |
| 10465 | G.last_exitcode = rcode = EXIT_SUCCESS; |
| 10466 | /* "if <false> THEN cmd": skip cmd */ |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 10467 | debug_printf_exec("skipped THEN cmd because IF condition was false\n"); |
| 10468 | last_rword = rword; |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 10469 | continue; |
| 10470 | } |
| 10471 | } else { |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 10472 | if (rword == RES_ELSE |
| 10473 | || (rword == RES_ELIF && last_rword != RES_ELIF) |
| 10474 | ) { |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 10475 | /* "if <true> then ... ELSE/ELIF cmd": |
| 10476 | * skip cmd and all following ones */ |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 10477 | debug_printf_exec("skipped ELSE/ELIF branch because IF condition was true\n"); |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 10478 | break; |
| 10479 | } |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 10480 | //if (rword == RES_THEN): "if <true> THEN cmd", run cmd (fall through) |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 10481 | } |
| 10482 | #endif |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 10483 | IF_HAS_KEYWORDS(last_rword = rword;) |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 10484 | #if ENABLE_HUSH_LOOPS |
| 10485 | if (rword == RES_FOR) { /* && pi->num_cmds - always == 1 */ |
| 10486 | if (!for_lcur) { |
| 10487 | /* first loop through for */ |
| 10488 | |
| 10489 | static const char encoded_dollar_at[] ALIGN1 = { |
| 10490 | SPECIAL_VAR_SYMBOL, '@' | 0x80, SPECIAL_VAR_SYMBOL, '\0' |
| 10491 | }; /* encoded representation of "$@" */ |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 10492 | static const char *const encoded_dollar_at_argv[] ALIGN_PTR = { |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 10493 | encoded_dollar_at, NULL |
| 10494 | }; /* argv list with one element: "$@" */ |
| 10495 | char **vals; |
| 10496 | |
| 10497 | G.last_exitcode = rcode = EXIT_SUCCESS; |
| 10498 | vals = (char**)encoded_dollar_at_argv; |
| 10499 | if (pi->next->res_word == RES_IN) { |
| 10500 | /* if no variable values after "in" we skip "for" */ |
| 10501 | if (!pi->next->cmds[0].argv) { |
| 10502 | debug_printf_exec(": null FOR: exitcode EXIT_SUCCESS\n"); |
| 10503 | break; |
| 10504 | } |
| 10505 | vals = pi->next->cmds[0].argv; |
| 10506 | } /* else: "for var; do..." -> assume "$@" list */ |
| 10507 | /* create list of variable values */ |
| 10508 | debug_print_strings("for_list made from", vals); |
| 10509 | for_list = expand_strvec_to_strvec(vals); |
| 10510 | for_lcur = for_list; |
| 10511 | debug_print_strings("for_list", for_list); |
| 10512 | } |
| 10513 | if (!*for_lcur) { |
| 10514 | /* "for" loop is over, clean up */ |
| 10515 | free(for_list); |
| 10516 | for_list = NULL; |
| 10517 | for_lcur = NULL; |
| 10518 | break; |
| 10519 | } |
| 10520 | /* Insert next value from for_lcur */ |
| 10521 | /* note: *for_lcur already has quotes removed, $var expanded, etc */ |
Francis Laniel | e252f50 | 2023-12-22 22:02:40 +0100 | [diff] [blame] | 10522 | #ifndef __U_BOOT__ |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 10523 | set_local_var_from_halves(pi->cmds[0].argv[0], *for_lcur++); |
Francis Laniel | e252f50 | 2023-12-22 22:02:40 +0100 | [diff] [blame] | 10524 | #else /* __U_BOOT__ */ |
| 10525 | /* We cannot use xasprintf, so we emulate it. */ |
| 10526 | char *full_var; |
| 10527 | char *var = pi->cmds[0].argv[0]; |
| 10528 | char *val = *for_lcur++; |
| 10529 | |
| 10530 | /* + 1 to take into account =. */ |
| 10531 | full_var = xmalloc(strlen(var) + strlen(val) + 1); |
| 10532 | sprintf(full_var, "%s=%s", var, val); |
| 10533 | |
| 10534 | set_local_var_modern(full_var, /*flag:*/ 0); |
| 10535 | #endif /* __U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 10536 | continue; |
| 10537 | } |
| 10538 | if (rword == RES_IN) { |
| 10539 | continue; /* "for v IN list;..." - "in" has no cmds anyway */ |
| 10540 | } |
| 10541 | if (rword == RES_DONE) { |
| 10542 | continue; /* "done" has no cmds too */ |
| 10543 | } |
| 10544 | #endif |
| 10545 | #if ENABLE_HUSH_CASE |
| 10546 | if (rword == RES_CASE) { |
| 10547 | debug_printf_exec("CASE cond_code:%d\n", cond_code); |
| 10548 | case_word = expand_string_to_string(pi->cmds->argv[0], |
| 10549 | EXP_FLAG_ESC_GLOB_CHARS, /*unbackslash:*/ 1); |
| 10550 | debug_printf_exec("CASE word1:'%s'\n", case_word); |
| 10551 | //unbackslash(case_word); |
| 10552 | //debug_printf_exec("CASE word2:'%s'\n", case_word); |
| 10553 | continue; |
| 10554 | } |
| 10555 | if (rword == RES_MATCH) { |
| 10556 | char **argv; |
| 10557 | |
| 10558 | debug_printf_exec("MATCH cond_code:%d\n", cond_code); |
| 10559 | if (!case_word) /* "case ... matched_word) ... WORD)": we executed selected branch, stop */ |
| 10560 | break; |
| 10561 | /* all prev words didn't match, does this one match? */ |
| 10562 | argv = pi->cmds->argv; |
| 10563 | while (*argv) { |
| 10564 | char *pattern; |
| 10565 | debug_printf_exec("expand_string_to_string('%s')\n", *argv); |
| 10566 | pattern = expand_string_to_string(*argv, |
| 10567 | EXP_FLAG_ESC_GLOB_CHARS, |
| 10568 | /*unbackslash:*/ 0 |
| 10569 | ); |
| 10570 | /* TODO: which FNM_xxx flags to use? */ |
| 10571 | cond_code = (fnmatch(pattern, case_word, /*flags:*/ 0) != 0); |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 10572 | debug_printf_exec("cond_code=fnmatch(pattern:'%s',str:'%s'):%d\n", |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 10573 | pattern, case_word, cond_code); |
| 10574 | free(pattern); |
| 10575 | if (cond_code == 0) { |
| 10576 | /* match! we will execute this branch */ |
| 10577 | free(case_word); |
| 10578 | case_word = NULL; /* make future "word)" stop */ |
| 10579 | break; |
| 10580 | } |
| 10581 | argv++; |
| 10582 | } |
| 10583 | continue; |
| 10584 | } |
| 10585 | if (rword == RES_CASE_BODY) { /* inside of a case branch */ |
| 10586 | debug_printf_exec("CASE_BODY cond_code:%d\n", cond_code); |
| 10587 | if (cond_code != 0) |
| 10588 | continue; /* not matched yet, skip this pipe */ |
| 10589 | } |
| 10590 | if (rword == RES_ESAC) { |
| 10591 | debug_printf_exec("ESAC cond_code:%d\n", cond_code); |
| 10592 | if (case_word) { |
| 10593 | /* "case" did not match anything: still set $? (to 0) */ |
| 10594 | G.last_exitcode = rcode = EXIT_SUCCESS; |
| 10595 | } |
| 10596 | } |
| 10597 | #endif |
| 10598 | /* Just pressing <enter> in shell should check for jobs. |
| 10599 | * OTOH, in non-interactive shell this is useless |
| 10600 | * and only leads to extra job checks */ |
| 10601 | if (pi->num_cmds == 0) { |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 10602 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 10603 | if (G_interactive_fd) |
| 10604 | goto check_jobs_and_continue; |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 10605 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 10606 | continue; |
| 10607 | } |
| 10608 | |
| 10609 | /* After analyzing all keywords and conditions, we decided |
| 10610 | * to execute this pipe. NB: have to do checkjobs(NULL) |
| 10611 | * after run_pipe to collect any background children, |
| 10612 | * even if list execution is to be stopped. */ |
| 10613 | debug_printf_exec(": run_pipe with %d members\n", pi->num_cmds); |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 10614 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 10615 | #if ENABLE_HUSH_LOOPS |
| 10616 | G.flag_break_continue = 0; |
| 10617 | #endif |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 10618 | #endif /* !__U_BOOT__ */ |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 10619 | #ifndef __U_BOOT__ |
| 10620 | rcode = r = G.o_opt[OPT_O_NOEXEC] ? 0 : run_pipe(pi); |
| 10621 | /* NB: rcode is a smalluint, r is int */ |
| 10622 | #else /* __U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 10623 | rcode = r = run_pipe(pi); /* NB: rcode is a smalluint, r is int */ |
Francis Laniel | 9a06837 | 2023-12-22 22:02:32 +0100 | [diff] [blame] | 10624 | if (r <= EXIT_RET_CODE) { |
| 10625 | int previous_rcode = G.last_exitcode; |
| 10626 | /* |
| 10627 | * This magic is to get the exit code given by the user. |
| 10628 | * Contrary to old shell code, we use + EXIT_RET_CODE as EXIT_RET_CODE |
| 10629 | * equals -2. |
| 10630 | */ |
| 10631 | G.last_exitcode = -r + EXIT_RET_CODE; |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 10632 | |
Francis Laniel | 9a06837 | 2023-12-22 22:02:32 +0100 | [diff] [blame] | 10633 | /* |
| 10634 | * This case deals with the following: |
| 10635 | * => setenv inner 'echo entry inner; exit; echo inner done' |
| 10636 | * => setenv outer 'echo entry outer; run inner; echo outer done' |
| 10637 | * => run outer |
| 10638 | * So, if we are in inner, we need to break and not run the other |
| 10639 | * commands. |
| 10640 | * Otherwise, we just continue in outer. |
| 10641 | * As return code are propagated, we use the previous value to check if |
| 10642 | * exit was just called or was propagated. |
| 10643 | */ |
| 10644 | if (previous_rcode != r) { |
| 10645 | /* |
| 10646 | * If run from run_command, run_command_flags will be set, so we check |
| 10647 | * this to know if we are in main input shell. |
| 10648 | */ |
| 10649 | if (!G.run_command_flags) |
| 10650 | printf("exit not allowed from main input shell.\n"); |
| 10651 | |
| 10652 | break; |
| 10653 | } |
| 10654 | continue; |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 10655 | } |
Francis Laniel | 9a06837 | 2023-12-22 22:02:32 +0100 | [diff] [blame] | 10656 | #endif /* __U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 10657 | if (r != -1) { |
| 10658 | /* We ran a builtin, function, or group. |
| 10659 | * rcode is already known |
| 10660 | * and we don't need to wait for anything. */ |
| 10661 | debug_printf_exec(": builtin/func exitcode %d\n", rcode); |
| 10662 | G.last_exitcode = rcode; |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 10663 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 10664 | check_and_run_traps(); |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 10665 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 10666 | #if ENABLE_HUSH_TRAP && ENABLE_HUSH_FUNCTIONS |
| 10667 | rcode = G.last_exitcode; /* "return" in trap can change it, read back */ |
| 10668 | #endif |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 10669 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 10670 | #if ENABLE_HUSH_LOOPS |
| 10671 | /* Was it "break" or "continue"? */ |
| 10672 | if (G.flag_break_continue) { |
| 10673 | smallint fbc = G.flag_break_continue; |
| 10674 | /* We might fall into outer *loop*, |
| 10675 | * don't want to break it too */ |
| 10676 | if (loop_top) { |
| 10677 | G.depth_break_continue--; |
| 10678 | if (G.depth_break_continue == 0) |
| 10679 | G.flag_break_continue = 0; |
| 10680 | /* else: e.g. "continue 2" should *break* once, *then* continue */ |
| 10681 | } /* else: "while... do... { we are here (innermost list is not a loop!) };...done" */ |
| 10682 | if (G.depth_break_continue != 0 || fbc == BC_BREAK) { |
| 10683 | checkjobs(NULL, 0 /*(no pid to wait for)*/); |
| 10684 | break; |
| 10685 | } |
| 10686 | /* "continue": simulate end of loop */ |
| 10687 | rword = RES_DONE; |
| 10688 | continue; |
| 10689 | } |
| 10690 | #endif |
| 10691 | if (G_flag_return_in_progress == 1) { |
| 10692 | checkjobs(NULL, 0 /*(no pid to wait for)*/); |
| 10693 | break; |
| 10694 | } |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 10695 | |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 10696 | } else if (pi->followup == PIPE_BG) { |
| 10697 | /* What does bash do with attempts to background builtins? */ |
| 10698 | /* even bash 3.2 doesn't do that well with nested bg: |
| 10699 | * try "{ { sleep 10; echo DEEP; } & echo HERE; } &". |
| 10700 | * I'm NOT treating inner &'s as jobs */ |
| 10701 | #if ENABLE_HUSH_JOB |
| 10702 | if (G.run_list_level == 1) |
| 10703 | insert_job_into_table(pi); |
| 10704 | #endif |
| 10705 | /* Last command's pid goes to $! */ |
| 10706 | G.last_bg_pid = pi->cmds[pi->num_cmds - 1].pid; |
| 10707 | G.last_bg_pid_exitcode = 0; |
| 10708 | debug_printf_exec(": cmd&: exitcode EXIT_SUCCESS\n"); |
| 10709 | /* Check pi->pi_inverted? "! sleep 1 & echo $?": bash says 1. dash and ash say 0 */ |
| 10710 | rcode = EXIT_SUCCESS; |
| 10711 | goto check_traps; |
| 10712 | } else { |
| 10713 | #if ENABLE_HUSH_JOB |
| 10714 | if (G.run_list_level == 1 && G_interactive_fd) { |
| 10715 | /* Waits for completion, then fg's main shell */ |
| 10716 | rcode = checkjobs_and_fg_shell(pi); |
| 10717 | debug_printf_exec(": checkjobs_and_fg_shell exitcode %d\n", rcode); |
| 10718 | goto check_traps; |
| 10719 | } |
| 10720 | #endif |
| 10721 | /* This one just waits for completion */ |
| 10722 | rcode = checkjobs(pi, 0 /*(no pid to wait for)*/); |
| 10723 | debug_printf_exec(": checkjobs exitcode %d\n", rcode); |
| 10724 | check_traps: |
| 10725 | G.last_exitcode = rcode; |
| 10726 | check_and_run_traps(); |
| 10727 | #if ENABLE_HUSH_TRAP && ENABLE_HUSH_FUNCTIONS |
| 10728 | rcode = G.last_exitcode; /* "return" in trap can change it, read back */ |
| 10729 | #endif |
| 10730 | } |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 10731 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 10732 | |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 10733 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 10734 | /* Handle "set -e" */ |
| 10735 | if (rcode != 0 && G.o_opt[OPT_O_ERREXIT]) { |
| 10736 | debug_printf_exec("ERREXIT:1 errexit_depth:%d\n", G.errexit_depth); |
| 10737 | if (G.errexit_depth == 0) |
| 10738 | hush_exit(rcode); |
| 10739 | } |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 10740 | #else /* __U_BOOT__ */ |
| 10741 | } /* if (r != -1) */ |
| 10742 | #endif /* __U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 10743 | G.errexit_depth = sv_errexit_depth; |
| 10744 | |
| 10745 | /* Analyze how result affects subsequent commands */ |
| 10746 | #if ENABLE_HUSH_IF |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 10747 | if (rword == RES_IF || rword == RES_ELIF) { |
| 10748 | debug_printf_exec("cond_code=rcode:%d\n", rcode); |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 10749 | cond_code = rcode; |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 10750 | } |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 10751 | #endif |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 10752 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 10753 | check_jobs_and_continue: |
| 10754 | checkjobs(NULL, 0 /*(no pid to wait for)*/); |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 10755 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 10756 | dont_check_jobs_but_continue: ; |
| 10757 | #if ENABLE_HUSH_LOOPS |
| 10758 | /* Beware of "while false; true; do ..."! */ |
| 10759 | if (pi->next |
| 10760 | && (pi->next->res_word == RES_DO || pi->next->res_word == RES_DONE) |
| 10761 | /* check for RES_DONE is needed for "while ...; do \n done" case */ |
| 10762 | ) { |
| 10763 | if (rword == RES_WHILE) { |
| 10764 | if (rcode) { |
| 10765 | /* "while false; do...done" - exitcode 0 */ |
| 10766 | G.last_exitcode = rcode = EXIT_SUCCESS; |
| 10767 | debug_printf_exec(": while expr is false: breaking (exitcode:EXIT_SUCCESS)\n"); |
| 10768 | break; |
| 10769 | } |
| 10770 | } |
| 10771 | if (rword == RES_UNTIL) { |
| 10772 | if (!rcode) { |
| 10773 | debug_printf_exec(": until expr is true: breaking\n"); |
| 10774 | break; |
| 10775 | } |
| 10776 | } |
| 10777 | } |
| 10778 | #endif |
| 10779 | } /* for (pi) */ |
| 10780 | |
| 10781 | #if ENABLE_HUSH_JOB |
| 10782 | G.run_list_level--; |
| 10783 | #endif |
| 10784 | #if ENABLE_HUSH_LOOPS |
| 10785 | if (loop_top) |
| 10786 | G.depth_of_loop--; |
| 10787 | free(for_list); |
| 10788 | #endif |
| 10789 | #if ENABLE_HUSH_CASE |
| 10790 | free(case_word); |
| 10791 | #endif |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 10792 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 10793 | debug_leave(); |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 10794 | debug_printf_exec("run_list lvl %d return %d\n", G.run_list_level, rcode); |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 10795 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 10796 | return rcode; |
| 10797 | } |
| 10798 | |
| 10799 | /* Select which version we will use */ |
| 10800 | static int run_and_free_list(struct pipe *pi) |
| 10801 | { |
| 10802 | int rcode = 0; |
| 10803 | debug_printf_exec("run_and_free_list entered\n"); |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 10804 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 10805 | if (!G.o_opt[OPT_O_NOEXEC]) { |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 10806 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 10807 | debug_printf_exec(": run_list: 1st pipe with %d cmds\n", pi->num_cmds); |
| 10808 | rcode = run_list(pi); |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 10809 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 10810 | } |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 10811 | #endif /* !__U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 10812 | /* free_pipe_list has the side effect of clearing memory. |
| 10813 | * In the long run that function can be merged with run_list, |
| 10814 | * but doing that now would hobble the debugging effort. */ |
| 10815 | free_pipe_list(pi); |
| 10816 | debug_printf_exec("run_and_free_list return %d\n", rcode); |
| 10817 | return rcode; |
| 10818 | } |
| 10819 | |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 10820 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 10821 | static void install_sighandlers(unsigned mask) |
| 10822 | { |
| 10823 | sighandler_t old_handler; |
| 10824 | unsigned sig = 0; |
| 10825 | while ((mask >>= 1) != 0) { |
| 10826 | sig++; |
| 10827 | if (!(mask & 1)) |
| 10828 | continue; |
| 10829 | old_handler = install_sighandler(sig, pick_sighandler(sig)); |
| 10830 | /* POSIX allows shell to re-enable SIGCHLD |
| 10831 | * even if it was SIG_IGN on entry. |
| 10832 | * Therefore we skip IGN check for it: |
| 10833 | */ |
| 10834 | if (sig == SIGCHLD) |
| 10835 | continue; |
| 10836 | /* Interactive bash re-enables SIGHUP which is SIG_IGNed on entry. |
| 10837 | * Try: |
| 10838 | * trap '' hup; bash; echo RET # type "kill -hup $$", see SIGHUP having effect |
| 10839 | * trap '' hup; bash -c 'kill -hup $$; echo ALIVE' # here SIGHUP is SIG_IGNed |
| 10840 | */ |
| 10841 | if (sig == SIGHUP && G_interactive_fd) |
| 10842 | continue; |
| 10843 | /* Unless one of the above signals, is it SIG_IGN? */ |
| 10844 | if (old_handler == SIG_IGN) { |
| 10845 | /* oops... restore back to IGN, and record this fact */ |
| 10846 | install_sighandler(sig, old_handler); |
| 10847 | #if ENABLE_HUSH_TRAP |
| 10848 | if (!G_traps) |
| 10849 | G_traps = xzalloc(sizeof(G_traps[0]) * NSIG); |
| 10850 | free(G_traps[sig]); |
| 10851 | G_traps[sig] = xzalloc(1); /* == xstrdup(""); */ |
| 10852 | #endif |
| 10853 | } |
| 10854 | } |
| 10855 | } |
| 10856 | |
| 10857 | /* Called a few times only (or even once if "sh -c") */ |
| 10858 | static void install_special_sighandlers(void) |
| 10859 | { |
| 10860 | unsigned mask; |
| 10861 | |
| 10862 | /* Which signals are shell-special? */ |
| 10863 | mask = (1 << SIGQUIT) | (1 << SIGCHLD); |
| 10864 | if (G_interactive_fd) { |
| 10865 | mask |= SPECIAL_INTERACTIVE_SIGS; |
| 10866 | if (G_saved_tty_pgrp) /* we have ctty, job control sigs work */ |
| 10867 | mask |= SPECIAL_JOBSTOP_SIGS; |
| 10868 | } |
| 10869 | /* Careful, do not re-install handlers we already installed */ |
| 10870 | if (G.special_sig_mask != mask) { |
| 10871 | unsigned diff = mask & ~G.special_sig_mask; |
| 10872 | G.special_sig_mask = mask; |
| 10873 | install_sighandlers(diff); |
| 10874 | } |
| 10875 | } |
| 10876 | |
| 10877 | #if ENABLE_HUSH_JOB |
| 10878 | /* helper */ |
| 10879 | /* Set handlers to restore tty pgrp and exit */ |
| 10880 | static void install_fatal_sighandlers(void) |
| 10881 | { |
| 10882 | unsigned mask; |
| 10883 | |
| 10884 | /* We will restore tty pgrp on these signals */ |
| 10885 | mask = 0 |
| 10886 | /*+ (1 << SIGILL ) * HUSH_DEBUG*/ |
| 10887 | /*+ (1 << SIGFPE ) * HUSH_DEBUG*/ |
| 10888 | + (1 << SIGBUS ) * HUSH_DEBUG |
| 10889 | + (1 << SIGSEGV) * HUSH_DEBUG |
| 10890 | /*+ (1 << SIGTRAP) * HUSH_DEBUG*/ |
| 10891 | + (1 << SIGABRT) |
| 10892 | /* bash 3.2 seems to handle these just like 'fatal' ones */ |
| 10893 | + (1 << SIGPIPE) |
| 10894 | + (1 << SIGALRM) |
| 10895 | /* if we are interactive, SIGHUP, SIGTERM and SIGINT are special sigs. |
| 10896 | * if we aren't interactive... but in this case |
| 10897 | * we never want to restore pgrp on exit, and this fn is not called |
| 10898 | */ |
| 10899 | /*+ (1 << SIGHUP )*/ |
| 10900 | /*+ (1 << SIGTERM)*/ |
| 10901 | /*+ (1 << SIGINT )*/ |
| 10902 | ; |
| 10903 | G_fatal_sig_mask = mask; |
| 10904 | |
| 10905 | install_sighandlers(mask); |
| 10906 | } |
| 10907 | #endif |
| 10908 | |
| 10909 | static int set_mode(int state, char mode, const char *o_opt) |
| 10910 | { |
| 10911 | int idx; |
| 10912 | switch (mode) { |
| 10913 | case 'n': |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 10914 | /* set -n has no effect in interactive shell */ |
| 10915 | /* Try: while set -n; do echo $-; done */ |
| 10916 | if (!G_interactive_fd) |
| 10917 | G.o_opt[OPT_O_NOEXEC] = state; |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 10918 | break; |
| 10919 | case 'x': |
| 10920 | IF_HUSH_MODE_X(G_x_mode = state;) |
| 10921 | IF_HUSH_MODE_X(if (G.x_mode_fd <= 0) G.x_mode_fd = dup_CLOEXEC(2, 10);) |
| 10922 | break; |
| 10923 | case 'e': |
| 10924 | G.o_opt[OPT_O_ERREXIT] = state; |
| 10925 | break; |
| 10926 | case 'o': |
| 10927 | if (!o_opt) { |
| 10928 | /* "set -o" or "set +o" without parameter. |
| 10929 | * in bash, set -o produces this output: |
| 10930 | * pipefail off |
| 10931 | * and set +o: |
| 10932 | * set +o pipefail |
| 10933 | * We always use the second form. |
| 10934 | */ |
| 10935 | const char *p = o_opt_strings; |
| 10936 | idx = 0; |
| 10937 | while (*p) { |
| 10938 | printf("set %co %s\n", (G.o_opt[idx] ? '-' : '+'), p); |
| 10939 | idx++; |
| 10940 | p += strlen(p) + 1; |
| 10941 | } |
| 10942 | break; |
| 10943 | } |
| 10944 | idx = index_in_strings(o_opt_strings, o_opt); |
| 10945 | if (idx >= 0) { |
| 10946 | G.o_opt[idx] = state; |
| 10947 | break; |
| 10948 | } |
| 10949 | /* fall through to error */ |
| 10950 | default: |
| 10951 | return EXIT_FAILURE; |
| 10952 | } |
| 10953 | return EXIT_SUCCESS; |
| 10954 | } |
| 10955 | |
| 10956 | int hush_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
| 10957 | int hush_main(int argc, char **argv) |
| 10958 | { |
| 10959 | pid_t cached_getpid; |
| 10960 | enum { |
| 10961 | OPT_login = (1 << 0), |
| 10962 | }; |
| 10963 | unsigned flags; |
| 10964 | #if !BB_MMU |
| 10965 | unsigned builtin_argc = 0; |
| 10966 | #endif |
| 10967 | char **e; |
| 10968 | struct variable *cur_var; |
| 10969 | struct variable *shell_ver; |
| 10970 | |
| 10971 | INIT_G(); |
| 10972 | if (EXIT_SUCCESS != 0) /* if EXIT_SUCCESS == 0, it is already done */ |
| 10973 | G.last_exitcode = EXIT_SUCCESS; |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 10974 | #if !BB_MMU |
| 10975 | /* "Big heredoc" support via "sh -< STRING" invocation. |
| 10976 | * Check it first (do not bother to run the usual init code, |
| 10977 | * it is not needed for this case). |
| 10978 | */ |
| 10979 | if (argv[1] |
| 10980 | && argv[1][0] == '-' && argv[1][1] == '<' /*&& !argv[1][2]*/ |
| 10981 | /*&& argv[2] && !argv[3] - we don't check some conditions */ |
| 10982 | ) { |
| 10983 | full_write1_str(argv[2]); |
| 10984 | _exit(0); |
| 10985 | } |
| 10986 | G.argv0_for_re_execing = argv[0]; |
| 10987 | #endif |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 10988 | #if ENABLE_HUSH_TRAP |
| 10989 | # if ENABLE_HUSH_FUNCTIONS |
| 10990 | G.return_exitcode = -1; |
| 10991 | # endif |
| 10992 | G.pre_trap_exitcode = -1; |
| 10993 | #endif |
| 10994 | |
| 10995 | #if ENABLE_HUSH_FAST |
| 10996 | G.count_SIGCHLD++; /* ensure it is != G.handled_SIGCHLD */ |
| 10997 | #endif |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 10998 | |
| 10999 | cached_getpid = getpid(); /* for tcsetpgrp() during init */ |
| 11000 | G.root_pid = cached_getpid; /* for $PID (NOMMU can override via -$HEXPID:HEXPPID:...) */ |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 11001 | G.root_ppid = getppid(); /* for $PPID (NOMMU can override) */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 11002 | |
| 11003 | /* Deal with HUSH_VERSION */ |
| 11004 | debug_printf_env("unsetenv '%s'\n", "HUSH_VERSION"); |
| 11005 | unsetenv("HUSH_VERSION"); /* in case it exists in initial env */ |
| 11006 | shell_ver = xzalloc(sizeof(*shell_ver)); |
| 11007 | shell_ver->flg_export = 1; |
| 11008 | shell_ver->flg_read_only = 1; |
| 11009 | /* Code which handles ${var<op>...} needs writable values for all variables, |
| 11010 | * therefore we xstrdup: */ |
| 11011 | shell_ver->varstr = xstrdup(hush_version_str); |
| 11012 | |
| 11013 | /* Create shell local variables from the values |
| 11014 | * currently living in the environment */ |
| 11015 | G.top_var = shell_ver; |
| 11016 | cur_var = G.top_var; |
| 11017 | e = environ; |
| 11018 | if (e) while (*e) { |
| 11019 | char *value = strchr(*e, '='); |
| 11020 | if (value) { /* paranoia */ |
| 11021 | cur_var->next = xzalloc(sizeof(*cur_var)); |
| 11022 | cur_var = cur_var->next; |
| 11023 | cur_var->varstr = *e; |
| 11024 | cur_var->max_len = strlen(*e); |
| 11025 | cur_var->flg_export = 1; |
| 11026 | } |
| 11027 | e++; |
| 11028 | } |
| 11029 | /* (Re)insert HUSH_VERSION into env (AFTER we scanned the env!) */ |
| 11030 | debug_printf_env("putenv '%s'\n", shell_ver->varstr); |
| 11031 | putenv(shell_ver->varstr); |
| 11032 | |
| 11033 | /* Export PWD */ |
| 11034 | set_pwd_var(SETFLAG_EXPORT); |
| 11035 | |
| 11036 | #if BASH_HOSTNAME_VAR |
| 11037 | /* Set (but not export) HOSTNAME unless already set */ |
| 11038 | if (!get_local_var_value("HOSTNAME")) { |
| 11039 | struct utsname uts; |
| 11040 | uname(&uts); |
| 11041 | set_local_var_from_halves("HOSTNAME", uts.nodename); |
| 11042 | } |
| 11043 | #endif |
| 11044 | /* IFS is not inherited from the parent environment */ |
| 11045 | set_local_var_from_halves("IFS", defifs); |
| 11046 | |
| 11047 | if (!get_local_var_value("PATH")) |
| 11048 | set_local_var_from_halves("PATH", bb_default_root_path); |
| 11049 | |
| 11050 | /* PS1/PS2 are set later, if we determine that we are interactive */ |
| 11051 | |
| 11052 | /* bash also exports SHLVL and _, |
| 11053 | * and sets (but doesn't export) the following variables: |
| 11054 | * BASH=/bin/bash |
| 11055 | * BASH_VERSINFO=([0]="3" [1]="2" [2]="0" [3]="1" [4]="release" [5]="i386-pc-linux-gnu") |
| 11056 | * BASH_VERSION='3.2.0(1)-release' |
| 11057 | * HOSTTYPE=i386 |
| 11058 | * MACHTYPE=i386-pc-linux-gnu |
| 11059 | * OSTYPE=linux-gnu |
| 11060 | * PPID=<NNNNN> - we also do it elsewhere |
| 11061 | * EUID=<NNNNN> |
| 11062 | * UID=<NNNNN> |
| 11063 | * GROUPS=() |
| 11064 | * LINES=<NNN> |
| 11065 | * COLUMNS=<NNN> |
| 11066 | * BASH_ARGC=() |
| 11067 | * BASH_ARGV=() |
| 11068 | * BASH_LINENO=() |
| 11069 | * BASH_SOURCE=() |
| 11070 | * DIRSTACK=() |
| 11071 | * PIPESTATUS=([0]="0") |
| 11072 | * HISTFILE=/<xxx>/.bash_history |
| 11073 | * HISTFILESIZE=500 |
| 11074 | * HISTSIZE=500 |
| 11075 | * MAILCHECK=60 |
| 11076 | * PATH=/usr/gnu/bin:/usr/local/bin:/bin:/usr/bin:. |
| 11077 | * SHELL=/bin/bash |
| 11078 | * SHELLOPTS=braceexpand:emacs:hashall:histexpand:history:interactive-comments:monitor |
| 11079 | * TERM=dumb |
| 11080 | * OPTERR=1 |
| 11081 | * OPTIND=1 |
| 11082 | * PS4='+ ' |
| 11083 | */ |
| 11084 | |
| 11085 | #if NUM_SCRIPTS > 0 |
| 11086 | if (argc < 0) { |
| 11087 | char *script = get_script_content(-argc - 1); |
| 11088 | G.global_argv = argv; |
| 11089 | G.global_argc = string_array_len(argv); |
| 11090 | //install_special_sighandlers(); - needed? |
| 11091 | parse_and_run_string(script); |
| 11092 | goto final_return; |
| 11093 | } |
| 11094 | #endif |
| 11095 | |
| 11096 | /* Initialize some more globals to non-zero values */ |
| 11097 | die_func = restore_ttypgrp_and__exit; |
| 11098 | |
| 11099 | /* Shell is non-interactive at first. We need to call |
| 11100 | * install_special_sighandlers() if we are going to execute "sh <script>", |
| 11101 | * "sh -c <cmds>" or login shell's /etc/profile and friends. |
| 11102 | * If we later decide that we are interactive, we run install_special_sighandlers() |
| 11103 | * in order to intercept (more) signals. |
| 11104 | */ |
| 11105 | |
| 11106 | /* Parse options */ |
| 11107 | /* http://www.opengroup.org/onlinepubs/9699919799/utilities/sh.html */ |
| 11108 | flags = (argv[0] && argv[0][0] == '-') ? OPT_login : 0; |
| 11109 | while (1) { |
| 11110 | int opt = getopt(argc, argv, "+" /* stop at 1st non-option */ |
| 11111 | "cexinsl" |
| 11112 | #if !BB_MMU |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 11113 | "$:R:V:" |
| 11114 | # if ENABLE_HUSH_LINENO_VAR |
| 11115 | "L:" |
| 11116 | # endif |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 11117 | # if ENABLE_HUSH_FUNCTIONS |
| 11118 | "F:" |
| 11119 | # endif |
| 11120 | #endif |
| 11121 | ); |
| 11122 | if (opt <= 0) |
| 11123 | break; |
| 11124 | switch (opt) { |
| 11125 | case 'c': |
| 11126 | /* Note: -c is not an option with param! |
| 11127 | * "hush -c -l SCRIPT" is valid. "hush -cSCRIPT" is not. |
| 11128 | */ |
| 11129 | G.opt_c = 1; |
| 11130 | break; |
| 11131 | case 'i': |
| 11132 | /* Well, we cannot just declare interactiveness, |
| 11133 | * we have to have some stuff (ctty, etc) */ |
| 11134 | /* G_interactive_fd++; */ |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 11135 | //There are a few cases where bash -i -c 'SCRIPT' |
| 11136 | //has visible effect (differs from bash -c 'SCRIPT'): |
| 11137 | //it ignores TERM: |
| 11138 | // bash -i -c 'kill $$; echo ALIVE' |
| 11139 | // ALIVE |
| 11140 | //it resets SIG_IGNed HUP to SIG_DFL: |
| 11141 | // trap '' hup; bash -i -c 'kill -hup $$; echo ALIVE' |
| 11142 | // Hangup [the message is not printed by bash, it's the shell which started it] |
| 11143 | //is talkative about jobs and exiting: |
| 11144 | // bash -i -c 'sleep 1 & exit' |
| 11145 | // [1] 16170 |
| 11146 | // exit |
| 11147 | //includes $ENV file (only if run as "sh"): |
| 11148 | // echo last >/tmp/ENV; ENV=/tmp/ENV sh -i -c 'echo HERE' |
| 11149 | // last: cannot open /var/log/wtmp: No such file or directory |
| 11150 | // HERE |
| 11151 | //(under "bash", it's the opposite: it runs $BASH_ENV file only *without* -i). |
| 11152 | // |
| 11153 | //ash -i -c 'sleep 3; sleep 3', on ^C, drops into a prompt instead of exiting |
| 11154 | //(this may be a bug, bash does not do this). |
| 11155 | //(ash -i -c 'sleep 3' won't show this, the last command gets auto-"exec"ed) |
| 11156 | // |
| 11157 | //None of the above feel like useful features people would rely on. |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 11158 | break; |
| 11159 | case 's': |
| 11160 | G.opt_s = 1; |
| 11161 | break; |
| 11162 | case 'l': |
| 11163 | flags |= OPT_login; |
| 11164 | break; |
| 11165 | #if !BB_MMU |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 11166 | case '$': { |
| 11167 | unsigned long long empty_trap_mask; |
| 11168 | |
| 11169 | G.root_pid = bb_strtou(optarg, &optarg, 16); |
| 11170 | optarg++; |
| 11171 | G.root_ppid = bb_strtou(optarg, &optarg, 16); |
| 11172 | optarg++; |
| 11173 | G.last_bg_pid = bb_strtou(optarg, &optarg, 16); |
| 11174 | optarg++; |
| 11175 | G.last_exitcode = bb_strtou(optarg, &optarg, 16); |
| 11176 | optarg++; |
| 11177 | builtin_argc = bb_strtou(optarg, &optarg, 16); |
| 11178 | optarg++; |
| 11179 | empty_trap_mask = bb_strtoull(optarg, &optarg, 16); |
| 11180 | if (empty_trap_mask != 0) { |
| 11181 | IF_HUSH_TRAP(int sig;) |
| 11182 | install_special_sighandlers(); |
| 11183 | # if ENABLE_HUSH_TRAP |
| 11184 | G_traps = xzalloc(sizeof(G_traps[0]) * NSIG); |
| 11185 | for (sig = 1; sig < NSIG; sig++) { |
| 11186 | if (empty_trap_mask & (1LL << sig)) { |
| 11187 | G_traps[sig] = xzalloc(1); /* == xstrdup(""); */ |
| 11188 | install_sighandler(sig, SIG_IGN); |
| 11189 | } |
| 11190 | } |
| 11191 | # endif |
| 11192 | } |
| 11193 | # if ENABLE_HUSH_LOOPS |
| 11194 | optarg++; |
| 11195 | G.depth_of_loop = bb_strtou(optarg, &optarg, 16); |
| 11196 | # endif |
| 11197 | /* Suppress "killed by signal" message, -$ hack is used |
| 11198 | * for subshells: echo `sh -c 'kill -9 $$'` |
| 11199 | * should be silent. |
| 11200 | */ |
| 11201 | IF_HUSH_JOB(G.run_list_level = 1;) |
| 11202 | # if ENABLE_HUSH_FUNCTIONS |
| 11203 | /* nommu uses re-exec trick for "... | func | ...", |
| 11204 | * should allow "return". |
| 11205 | * This accidentally allows returns in subshells. |
| 11206 | */ |
| 11207 | G_flag_return_in_progress = -1; |
| 11208 | # endif |
| 11209 | break; |
| 11210 | } |
| 11211 | case 'R': |
| 11212 | case 'V': |
| 11213 | set_local_var(xstrdup(optarg), opt == 'R' ? SETFLAG_MAKE_RO : 0); |
| 11214 | break; |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 11215 | # if ENABLE_HUSH_LINENO_VAR |
| 11216 | case 'L': |
| 11217 | G.parse_lineno = xatou(optarg); |
| 11218 | break; |
| 11219 | # endif |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 11220 | # if ENABLE_HUSH_FUNCTIONS |
| 11221 | case 'F': { |
| 11222 | struct function *funcp = new_function(optarg); |
| 11223 | /* funcp->name is already set to optarg */ |
| 11224 | /* funcp->body is set to NULL. It's a special case. */ |
| 11225 | funcp->body_as_string = argv[optind]; |
| 11226 | optind++; |
| 11227 | break; |
| 11228 | } |
| 11229 | # endif |
| 11230 | #endif |
| 11231 | /*case '?': invalid option encountered (set_mode('?') will fail) */ |
| 11232 | /*case 'n':*/ |
| 11233 | /*case 'x':*/ |
| 11234 | /*case 'e':*/ |
| 11235 | default: |
| 11236 | if (set_mode(1, opt, NULL) == 0) /* no error */ |
| 11237 | break; |
| 11238 | bb_show_usage(); |
| 11239 | } |
| 11240 | } /* option parsing loop */ |
| 11241 | |
| 11242 | /* Skip options. Try "hush -l": $1 should not be "-l"! */ |
| 11243 | G.global_argc = argc - (optind - 1); |
| 11244 | G.global_argv = argv + (optind - 1); |
| 11245 | G.global_argv[0] = argv[0]; |
| 11246 | |
| 11247 | /* If we are login shell... */ |
| 11248 | if (flags & OPT_login) { |
| 11249 | const char *hp = NULL; |
| 11250 | HFILE *input; |
| 11251 | |
| 11252 | debug_printf("sourcing /etc/profile\n"); |
| 11253 | input = hfopen("/etc/profile"); |
| 11254 | run_profile: |
| 11255 | if (input != NULL) { |
| 11256 | install_special_sighandlers(); |
| 11257 | parse_and_run_file(input); |
| 11258 | hfclose(input); |
| 11259 | } |
| 11260 | /* bash: after sourcing /etc/profile, |
| 11261 | * tries to source (in the given order): |
| 11262 | * ~/.bash_profile, ~/.bash_login, ~/.profile, |
| 11263 | * stopping on first found. --noprofile turns this off. |
| 11264 | * bash also sources ~/.bash_logout on exit. |
| 11265 | * If called as sh, skips .bash_XXX files. |
| 11266 | */ |
| 11267 | if (!hp) { /* unless we looped on the "goto" already */ |
| 11268 | hp = get_local_var_value("HOME"); |
| 11269 | if (hp && hp[0]) { |
| 11270 | debug_printf("sourcing ~/.profile\n"); |
| 11271 | hp = concat_path_file(hp, ".profile"); |
| 11272 | input = hfopen(hp); |
| 11273 | free((char*)hp); |
| 11274 | goto run_profile; |
| 11275 | } |
| 11276 | } |
| 11277 | } |
| 11278 | |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 11279 | #ifndef __U_BOOT__ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 11280 | /* -c takes effect *after* -l */ |
| 11281 | if (G.opt_c) { |
| 11282 | /* Possibilities: |
| 11283 | * sh ... -c 'script' |
| 11284 | * sh ... -c 'script' ARG0 [ARG1...] |
| 11285 | * On NOMMU, if builtin_argc != 0, |
| 11286 | * sh ... -c 'builtin' BARGV... "" ARG0 [ARG1...] |
| 11287 | * "" needs to be replaced with NULL |
| 11288 | * and BARGV vector fed to builtin function. |
| 11289 | * Note: the form without ARG0 never happens: |
| 11290 | * sh ... -c 'builtin' BARGV... "" |
| 11291 | */ |
| 11292 | char *script; |
| 11293 | |
| 11294 | install_special_sighandlers(); |
| 11295 | |
| 11296 | G.global_argc--; |
| 11297 | G.global_argv++; |
| 11298 | #if !BB_MMU |
| 11299 | if (builtin_argc) { |
| 11300 | /* -c 'builtin' [BARGV...] "" ARG0 [ARG1...] */ |
| 11301 | const struct built_in_command *x; |
| 11302 | x = find_builtin(G.global_argv[0]); |
| 11303 | if (x) { /* paranoia */ |
| 11304 | argv = G.global_argv; |
| 11305 | G.global_argc -= builtin_argc + 1; /* skip [BARGV...] "" */ |
| 11306 | G.global_argv += builtin_argc + 1; |
| 11307 | G.global_argv[-1] = NULL; /* replace "" */ |
| 11308 | G.last_exitcode = x->b_function(argv); |
| 11309 | } |
| 11310 | goto final_return; |
| 11311 | } |
| 11312 | #endif |
| 11313 | |
| 11314 | script = G.global_argv[0]; |
| 11315 | if (!script) |
| 11316 | bb_error_msg_and_die(bb_msg_requires_arg, "-c"); |
| 11317 | if (!G.global_argv[1]) { |
| 11318 | /* -c 'script' (no params): prevent empty $0 */ |
| 11319 | G.global_argv[0] = argv[0]; |
| 11320 | } else { /* else -c 'script' ARG0 [ARG1...]: $0 is ARG0 */ |
| 11321 | G.global_argc--; |
| 11322 | G.global_argv++; |
| 11323 | } |
| 11324 | parse_and_run_string(script); |
| 11325 | goto final_return; |
| 11326 | } |
| 11327 | |
| 11328 | /* -s is: hush -s ARGV1 ARGV2 (no SCRIPT) */ |
| 11329 | if (!G.opt_s && G.global_argv[1]) { |
| 11330 | HFILE *input; |
| 11331 | /* |
| 11332 | * "bash <script>" (which is never interactive (unless -i?)) |
| 11333 | * sources $BASH_ENV here (without scanning $PATH). |
| 11334 | * If called as sh, does the same but with $ENV. |
| 11335 | * Also NB, per POSIX, $ENV should undergo parameter expansion. |
| 11336 | */ |
| 11337 | G.global_argc--; |
| 11338 | G.global_argv++; |
| 11339 | debug_printf("running script '%s'\n", G.global_argv[0]); |
| 11340 | xfunc_error_retval = 127; /* for "hush /does/not/exist" case */ |
| 11341 | input = hfopen(G.global_argv[0]); |
| 11342 | if (!input) { |
| 11343 | bb_simple_perror_msg_and_die(G.global_argv[0]); |
| 11344 | } |
| 11345 | xfunc_error_retval = 1; |
| 11346 | install_special_sighandlers(); |
| 11347 | parse_and_run_file(input); |
| 11348 | #if ENABLE_FEATURE_CLEAN_UP |
| 11349 | hfclose(input); |
| 11350 | #endif |
| 11351 | goto final_return; |
| 11352 | } |
| 11353 | /* "implicit" -s: bare interactive hush shows 's' in $- */ |
| 11354 | G.opt_s = 1; |
| 11355 | |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 11356 | #endif /* __U_BOOT__ */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 11357 | /* Up to here, shell was non-interactive. Now it may become one. |
| 11358 | * NB: don't forget to (re)run install_special_sighandlers() as needed. |
| 11359 | */ |
| 11360 | |
| 11361 | /* A shell is interactive if the '-i' flag was given, |
| 11362 | * or if all of the following conditions are met: |
| 11363 | * no -c command |
| 11364 | * no arguments remaining or the -s flag given |
| 11365 | * standard input is a terminal |
| 11366 | * standard output is a terminal |
| 11367 | * Refer to Posix.2, the description of the 'sh' utility. |
| 11368 | */ |
| 11369 | #if ENABLE_HUSH_JOB |
| 11370 | if (isatty(STDIN_FILENO) && isatty(STDOUT_FILENO)) { |
| 11371 | G_saved_tty_pgrp = tcgetpgrp(STDIN_FILENO); |
| 11372 | debug_printf("saved_tty_pgrp:%d\n", G_saved_tty_pgrp); |
| 11373 | if (G_saved_tty_pgrp < 0) |
| 11374 | G_saved_tty_pgrp = 0; |
| 11375 | |
| 11376 | /* try to dup stdin to high fd#, >= 255 */ |
| 11377 | G_interactive_fd = dup_CLOEXEC(STDIN_FILENO, 254); |
| 11378 | if (G_interactive_fd < 0) { |
| 11379 | /* try to dup to any fd */ |
| 11380 | G_interactive_fd = dup(STDIN_FILENO); |
| 11381 | if (G_interactive_fd < 0) { |
| 11382 | /* give up */ |
| 11383 | G_interactive_fd = 0; |
| 11384 | G_saved_tty_pgrp = 0; |
| 11385 | } |
| 11386 | } |
| 11387 | } |
| 11388 | debug_printf("interactive_fd:%d\n", G_interactive_fd); |
| 11389 | if (G_interactive_fd) { |
| 11390 | close_on_exec_on(G_interactive_fd); |
| 11391 | |
| 11392 | if (G_saved_tty_pgrp) { |
| 11393 | /* If we were run as 'hush &', sleep until we are |
| 11394 | * in the foreground (tty pgrp == our pgrp). |
| 11395 | * If we get started under a job aware app (like bash), |
| 11396 | * make sure we are now in charge so we don't fight over |
| 11397 | * who gets the foreground */ |
| 11398 | while (1) { |
| 11399 | pid_t shell_pgrp = getpgrp(); |
| 11400 | G_saved_tty_pgrp = tcgetpgrp(G_interactive_fd); |
| 11401 | if (G_saved_tty_pgrp == shell_pgrp) |
| 11402 | break; |
| 11403 | /* send TTIN to ourself (should stop us) */ |
| 11404 | kill(- shell_pgrp, SIGTTIN); |
| 11405 | } |
| 11406 | } |
| 11407 | |
| 11408 | /* Install more signal handlers */ |
| 11409 | install_special_sighandlers(); |
| 11410 | |
| 11411 | if (G_saved_tty_pgrp) { |
| 11412 | /* Set other signals to restore saved_tty_pgrp */ |
| 11413 | install_fatal_sighandlers(); |
| 11414 | /* Put ourselves in our own process group |
| 11415 | * (bash, too, does this only if ctty is available) */ |
| 11416 | bb_setpgrp(); /* is the same as setpgid(our_pid, our_pid); */ |
| 11417 | /* Grab control of the terminal */ |
| 11418 | tcsetpgrp(G_interactive_fd, cached_getpid); |
| 11419 | } |
| 11420 | enable_restore_tty_pgrp_on_exit(); |
| 11421 | |
| 11422 | # if ENABLE_FEATURE_EDITING |
| 11423 | G.line_input_state = new_line_input_t(FOR_SHELL); |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 11424 | # if ENABLE_FEATURE_TAB_COMPLETION |
| 11425 | G.line_input_state->get_exe_name = hush_command_name; |
| 11426 | # endif |
| 11427 | # if EDITING_HAS_sh_get_var |
| 11428 | G.line_input_state->sh_get_var = get_local_var_value; |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 11429 | # endif |
| 11430 | # endif |
| 11431 | # if ENABLE_HUSH_SAVEHISTORY && MAX_HISTORY > 0 |
| 11432 | { |
| 11433 | const char *hp = get_local_var_value("HISTFILE"); |
| 11434 | if (!hp) { |
| 11435 | hp = get_local_var_value("HOME"); |
| 11436 | if (hp) |
| 11437 | hp = concat_path_file(hp, ".hush_history"); |
| 11438 | } else { |
| 11439 | hp = xstrdup(hp); |
| 11440 | } |
| 11441 | if (hp) { |
| 11442 | G.line_input_state->hist_file = hp; |
| 11443 | //set_local_var(xasprintf("HISTFILE=%s", ...)); |
| 11444 | } |
| 11445 | # if ENABLE_FEATURE_SH_HISTFILESIZE |
| 11446 | hp = get_local_var_value("HISTFILESIZE"); |
| 11447 | G.line_input_state->max_history = size_from_HISTFILESIZE(hp); |
| 11448 | # endif |
| 11449 | } |
| 11450 | # endif |
| 11451 | } else { |
| 11452 | install_special_sighandlers(); |
| 11453 | } |
| 11454 | #elif ENABLE_HUSH_INTERACTIVE |
| 11455 | /* No job control compiled in, only prompt/line editing */ |
| 11456 | if (isatty(STDIN_FILENO) && isatty(STDOUT_FILENO)) { |
| 11457 | G_interactive_fd = dup_CLOEXEC(STDIN_FILENO, 254); |
| 11458 | if (G_interactive_fd < 0) { |
| 11459 | /* try to dup to any fd */ |
| 11460 | G_interactive_fd = dup_CLOEXEC(STDIN_FILENO, -1); |
| 11461 | if (G_interactive_fd < 0) |
| 11462 | /* give up */ |
| 11463 | G_interactive_fd = 0; |
| 11464 | } |
| 11465 | } |
| 11466 | if (G_interactive_fd) { |
| 11467 | close_on_exec_on(G_interactive_fd); |
| 11468 | } |
| 11469 | install_special_sighandlers(); |
| 11470 | #else |
| 11471 | /* We have interactiveness code disabled */ |
| 11472 | install_special_sighandlers(); |
| 11473 | #endif |
| 11474 | /* bash: |
| 11475 | * if interactive but not a login shell, sources ~/.bashrc |
| 11476 | * (--norc turns this off, --rcfile <file> overrides) |
| 11477 | */ |
| 11478 | |
| 11479 | if (G_interactive_fd) { |
| 11480 | #if ENABLE_HUSH_INTERACTIVE && ENABLE_FEATURE_EDITING_FANCY_PROMPT |
| 11481 | /* Set (but not export) PS1/2 unless already set */ |
| 11482 | if (!get_local_var_value("PS1")) |
| 11483 | set_local_var_from_halves("PS1", "\\w \\$ "); |
| 11484 | if (!get_local_var_value("PS2")) |
| 11485 | set_local_var_from_halves("PS2", "> "); |
| 11486 | #endif |
| 11487 | if (!ENABLE_FEATURE_SH_EXTRA_QUIET) { |
| 11488 | /* note: ash and hush share this string */ |
| 11489 | printf("\n\n%s %s\n" |
| 11490 | IF_HUSH_HELP("Enter 'help' for a list of built-in commands.\n") |
| 11491 | "\n", |
| 11492 | bb_banner, |
| 11493 | "hush - the humble shell" |
| 11494 | ); |
| 11495 | } |
| 11496 | } |
| 11497 | |
| 11498 | parse_and_run_file(hfopen(NULL)); /* stdin */ |
| 11499 | |
| 11500 | final_return: |
| 11501 | hush_exit(G.last_exitcode); |
| 11502 | } |
| 11503 | |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 11504 | /* |
| 11505 | * Built-ins |
| 11506 | */ |
| 11507 | static int FAST_FUNC builtin_true(char **argv UNUSED_PARAM) |
| 11508 | { |
| 11509 | return 0; |
| 11510 | } |
| 11511 | |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 11512 | static int FAST_FUNC builtin_false(char **argv UNUSED_PARAM) |
| 11513 | { |
| 11514 | return 1; |
| 11515 | } |
| 11516 | |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 11517 | #if ENABLE_HUSH_TEST || ENABLE_HUSH_ECHO || ENABLE_HUSH_PRINTF || ENABLE_HUSH_KILL |
| 11518 | static NOINLINE int run_applet_main(char **argv, int (*applet_main_func)(int argc, char **argv)) |
| 11519 | { |
| 11520 | int argc = string_array_len(argv); |
| 11521 | return applet_main_func(argc, argv); |
| 11522 | } |
| 11523 | #endif |
| 11524 | #if ENABLE_HUSH_TEST || BASH_TEST2 |
| 11525 | static int FAST_FUNC builtin_test(char **argv) |
| 11526 | { |
| 11527 | return run_applet_main(argv, test_main); |
| 11528 | } |
| 11529 | #endif |
| 11530 | #if ENABLE_HUSH_ECHO |
| 11531 | static int FAST_FUNC builtin_echo(char **argv) |
| 11532 | { |
| 11533 | return run_applet_main(argv, echo_main); |
| 11534 | } |
| 11535 | #endif |
| 11536 | #if ENABLE_HUSH_PRINTF |
| 11537 | static int FAST_FUNC builtin_printf(char **argv) |
| 11538 | { |
| 11539 | return run_applet_main(argv, printf_main); |
| 11540 | } |
| 11541 | #endif |
| 11542 | |
| 11543 | #if ENABLE_HUSH_HELP |
| 11544 | static int FAST_FUNC builtin_help(char **argv UNUSED_PARAM) |
| 11545 | { |
| 11546 | const struct built_in_command *x; |
| 11547 | |
| 11548 | printf( |
| 11549 | "Built-in commands:\n" |
| 11550 | "------------------\n"); |
| 11551 | for (x = bltins1; x != &bltins1[ARRAY_SIZE(bltins1)]; x++) { |
| 11552 | if (x->b_descr) |
| 11553 | printf("%-10s%s\n", x->b_cmd, x->b_descr); |
| 11554 | } |
| 11555 | return EXIT_SUCCESS; |
| 11556 | } |
| 11557 | #endif |
| 11558 | |
| 11559 | #if MAX_HISTORY && ENABLE_FEATURE_EDITING |
| 11560 | static int FAST_FUNC builtin_history(char **argv UNUSED_PARAM) |
| 11561 | { |
| 11562 | show_history(G.line_input_state); |
| 11563 | return EXIT_SUCCESS; |
| 11564 | } |
| 11565 | #endif |
| 11566 | |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 11567 | static int FAST_FUNC builtin_cd(char **argv) |
| 11568 | { |
| 11569 | const char *newdir; |
| 11570 | |
| 11571 | argv = skip_dash_dash(argv); |
| 11572 | newdir = argv[0]; |
| 11573 | if (newdir == NULL) { |
| 11574 | /* bash does nothing (exitcode 0) if HOME is ""; if it's unset, |
| 11575 | * bash says "bash: cd: HOME not set" and does nothing |
| 11576 | * (exitcode 1) |
| 11577 | */ |
| 11578 | const char *home = get_local_var_value("HOME"); |
| 11579 | newdir = home ? home : "/"; |
| 11580 | } |
| 11581 | if (chdir(newdir)) { |
| 11582 | /* Mimic bash message exactly */ |
| 11583 | bb_perror_msg("cd: %s", newdir); |
| 11584 | return EXIT_FAILURE; |
| 11585 | } |
| 11586 | /* Read current dir (get_cwd(1) is inside) and set PWD. |
| 11587 | * Note: do not enforce exporting. If PWD was unset or unexported, |
| 11588 | * set it again, but do not export. bash does the same. |
| 11589 | */ |
| 11590 | set_pwd_var(/*flag:*/ 0); |
| 11591 | return EXIT_SUCCESS; |
| 11592 | } |
| 11593 | |
| 11594 | static int FAST_FUNC builtin_pwd(char **argv UNUSED_PARAM) |
| 11595 | { |
| 11596 | puts(get_cwd(0)); |
| 11597 | return EXIT_SUCCESS; |
| 11598 | } |
| 11599 | |
| 11600 | static int FAST_FUNC builtin_eval(char **argv) |
| 11601 | { |
| 11602 | argv = skip_dash_dash(argv); |
| 11603 | |
| 11604 | if (!argv[0]) |
| 11605 | return EXIT_SUCCESS; |
| 11606 | |
| 11607 | IF_HUSH_MODE_X(G.x_mode_depth++;) |
| 11608 | //bb_error_msg("%s: ++x_mode_depth=%d", __func__, G.x_mode_depth); |
| 11609 | if (!argv[1]) { |
| 11610 | /* bash: |
| 11611 | * eval "echo Hi; done" ("done" is syntax error): |
| 11612 | * "echo Hi" will not execute too. |
| 11613 | */ |
| 11614 | parse_and_run_string(argv[0]); |
| 11615 | } else { |
| 11616 | /* "The eval utility shall construct a command by |
| 11617 | * concatenating arguments together, separating |
| 11618 | * each with a <space> character." |
| 11619 | */ |
| 11620 | char *str, *p; |
| 11621 | unsigned len = 0; |
| 11622 | char **pp = argv; |
| 11623 | do |
| 11624 | len += strlen(*pp) + 1; |
| 11625 | while (*++pp); |
| 11626 | str = p = xmalloc(len); |
| 11627 | pp = argv; |
| 11628 | for (;;) { |
| 11629 | p = stpcpy(p, *pp); |
| 11630 | pp++; |
| 11631 | if (!*pp) |
| 11632 | break; |
| 11633 | *p++ = ' '; |
| 11634 | } |
| 11635 | parse_and_run_string(str); |
| 11636 | free(str); |
| 11637 | } |
| 11638 | IF_HUSH_MODE_X(G.x_mode_depth--;) |
| 11639 | //bb_error_msg("%s: --x_mode_depth=%d", __func__, G.x_mode_depth); |
| 11640 | return G.last_exitcode; |
| 11641 | } |
| 11642 | |
| 11643 | static int FAST_FUNC builtin_exec(char **argv) |
| 11644 | { |
| 11645 | argv = skip_dash_dash(argv); |
| 11646 | if (argv[0] == NULL) |
| 11647 | return EXIT_SUCCESS; /* bash does this */ |
| 11648 | |
| 11649 | /* Careful: we can end up here after [v]fork. Do not restore |
| 11650 | * tty pgrp then, only top-level shell process does that */ |
| 11651 | if (G_saved_tty_pgrp && getpid() == G.root_pid) |
| 11652 | tcsetpgrp(G_interactive_fd, G_saved_tty_pgrp); |
| 11653 | |
| 11654 | /* Saved-redirect fds, script fds and G_interactive_fd are still |
| 11655 | * open here. However, they are all CLOEXEC, and execv below |
| 11656 | * closes them. Try interactive "exec ls -l /proc/self/fd", |
| 11657 | * it should show no extra open fds in the "ls" process. |
| 11658 | * If we'd try to run builtins/NOEXECs, this would need improving. |
| 11659 | */ |
| 11660 | //close_saved_fds_and_FILE_fds(); |
| 11661 | |
| 11662 | /* TODO: if exec fails, bash does NOT exit! We do. |
| 11663 | * We'll need to undo trap cleanup (it's inside execvp_or_die) |
| 11664 | * and tcsetpgrp, and this is inherently racy. |
| 11665 | */ |
| 11666 | execvp_or_die(argv); |
| 11667 | } |
| 11668 | |
| 11669 | static int FAST_FUNC builtin_exit(char **argv) |
| 11670 | { |
| 11671 | debug_printf_exec("%s()\n", __func__); |
| 11672 | |
| 11673 | /* interactive bash: |
| 11674 | * # trap "echo EEE" EXIT |
| 11675 | * # exit |
| 11676 | * exit |
| 11677 | * There are stopped jobs. |
| 11678 | * (if there are _stopped_ jobs, running ones don't count) |
| 11679 | * # exit |
| 11680 | * exit |
| 11681 | * EEE (then bash exits) |
| 11682 | * |
| 11683 | * TODO: we can use G.exiting = -1 as indicator "last cmd was exit" |
| 11684 | */ |
| 11685 | |
| 11686 | /* note: EXIT trap is run by hush_exit */ |
| 11687 | argv = skip_dash_dash(argv); |
| 11688 | if (argv[0] == NULL) { |
| 11689 | #if ENABLE_HUSH_TRAP |
| 11690 | if (G.pre_trap_exitcode >= 0) /* "exit" in trap uses $? from before the trap */ |
| 11691 | hush_exit(G.pre_trap_exitcode); |
| 11692 | #endif |
| 11693 | hush_exit(G.last_exitcode); |
| 11694 | } |
| 11695 | /* mimic bash: exit 123abc == exit 255 + error msg */ |
| 11696 | xfunc_error_retval = 255; |
| 11697 | /* bash: exit -2 == exit 254, no error msg */ |
| 11698 | hush_exit(xatoi(argv[0]) & 0xff); |
| 11699 | } |
| 11700 | |
| 11701 | #if ENABLE_HUSH_TYPE |
| 11702 | /* http://www.opengroup.org/onlinepubs/9699919799/utilities/type.html */ |
| 11703 | static int FAST_FUNC builtin_type(char **argv) |
| 11704 | { |
| 11705 | int ret = EXIT_SUCCESS; |
| 11706 | |
| 11707 | while (*++argv) { |
| 11708 | const char *type; |
| 11709 | char *path = NULL; |
| 11710 | |
| 11711 | if (0) {} /* make conditional compile easier below */ |
| 11712 | /*else if (find_alias(*argv)) |
| 11713 | type = "an alias";*/ |
| 11714 | # if ENABLE_HUSH_FUNCTIONS |
| 11715 | else if (find_function(*argv)) |
| 11716 | type = "a function"; |
| 11717 | # endif |
| 11718 | else if (find_builtin(*argv)) |
| 11719 | type = "a shell builtin"; |
| 11720 | else if ((path = find_in_path(*argv)) != NULL) |
| 11721 | type = path; |
| 11722 | else { |
| 11723 | bb_error_msg("type: %s: not found", *argv); |
| 11724 | ret = EXIT_FAILURE; |
| 11725 | continue; |
| 11726 | } |
| 11727 | |
| 11728 | printf("%s is %s\n", *argv, type); |
| 11729 | free(path); |
| 11730 | } |
| 11731 | |
| 11732 | return ret; |
| 11733 | } |
| 11734 | #endif |
| 11735 | |
| 11736 | #if ENABLE_HUSH_READ |
| 11737 | /* Interruptibility of read builtin in bash |
| 11738 | * (tested on bash-4.2.8 by sending signals (not by ^C)): |
| 11739 | * |
| 11740 | * Empty trap makes read ignore corresponding signal, for any signal. |
| 11741 | * |
| 11742 | * SIGINT: |
| 11743 | * - terminates non-interactive shell; |
| 11744 | * - interrupts read in interactive shell; |
| 11745 | * if it has non-empty trap: |
| 11746 | * - executes trap and returns to command prompt in interactive shell; |
| 11747 | * - executes trap and returns to read in non-interactive shell; |
| 11748 | * SIGTERM: |
| 11749 | * - is ignored (does not interrupt) read in interactive shell; |
| 11750 | * - terminates non-interactive shell; |
| 11751 | * if it has non-empty trap: |
| 11752 | * - executes trap and returns to read; |
| 11753 | * SIGHUP: |
| 11754 | * - terminates shell (regardless of interactivity); |
| 11755 | * if it has non-empty trap: |
| 11756 | * - executes trap and returns to read; |
| 11757 | * SIGCHLD from children: |
| 11758 | * - does not interrupt read regardless of interactivity: |
| 11759 | * try: sleep 1 & read x; echo $x |
| 11760 | */ |
| 11761 | static int FAST_FUNC builtin_read(char **argv) |
| 11762 | { |
| 11763 | const char *r; |
| 11764 | struct builtin_read_params params; |
| 11765 | |
| 11766 | memset(¶ms, 0, sizeof(params)); |
| 11767 | |
| 11768 | /* "!": do not abort on errors. |
| 11769 | * Option string must start with "sr" to match BUILTIN_READ_xxx |
| 11770 | */ |
| 11771 | params.read_flags = getopt32(argv, |
| 11772 | # if BASH_READ_D |
| 11773 | IF_NOT_HUSH_BASH_COMPAT("^") |
| 11774 | "!srn:p:t:u:d:" IF_NOT_HUSH_BASH_COMPAT("\0" "-1"/*min 1 arg*/), |
| 11775 | ¶ms.opt_n, ¶ms.opt_p, ¶ms.opt_t, ¶ms.opt_u, ¶ms.opt_d |
| 11776 | # else |
| 11777 | IF_NOT_HUSH_BASH_COMPAT("^") |
| 11778 | "!srn:p:t:u:" IF_NOT_HUSH_BASH_COMPAT("\0" "-1"/*min 1 arg*/), |
| 11779 | ¶ms.opt_n, ¶ms.opt_p, ¶ms.opt_t, ¶ms.opt_u |
| 11780 | # endif |
| 11781 | //TODO: print "read: need variable name" |
| 11782 | //for the case of !BASH "read" with no args (now it fails silently) |
| 11783 | //(or maybe extend getopt32() to emit a message if "-1" fails) |
| 11784 | ); |
| 11785 | if ((uint32_t)params.read_flags == (uint32_t)-1) |
| 11786 | return EXIT_FAILURE; |
| 11787 | argv += optind; |
| 11788 | params.argv = argv; |
| 11789 | params.setvar = set_local_var_from_halves; |
| 11790 | params.ifs = get_local_var_value("IFS"); /* can be NULL */ |
| 11791 | |
| 11792 | again: |
| 11793 | r = shell_builtin_read(¶ms); |
| 11794 | |
| 11795 | if ((uintptr_t)r == 1 && errno == EINTR) { |
| 11796 | unsigned sig = check_and_run_traps(); |
| 11797 | if (sig != SIGINT) |
| 11798 | goto again; |
| 11799 | } |
| 11800 | |
| 11801 | if ((uintptr_t)r > 1) { |
| 11802 | bb_simple_error_msg(r); |
| 11803 | r = (char*)(uintptr_t)1; |
| 11804 | } |
| 11805 | |
| 11806 | return (uintptr_t)r; |
| 11807 | } |
| 11808 | #endif |
| 11809 | |
| 11810 | #if ENABLE_HUSH_UMASK |
| 11811 | static int FAST_FUNC builtin_umask(char **argv) |
| 11812 | { |
| 11813 | int rc; |
| 11814 | mode_t mask; |
| 11815 | |
| 11816 | rc = 1; |
| 11817 | mask = umask(0); |
| 11818 | argv = skip_dash_dash(argv); |
| 11819 | if (argv[0]) { |
| 11820 | mode_t old_mask = mask; |
| 11821 | |
| 11822 | /* numeric umasks are taken as-is */ |
| 11823 | /* symbolic umasks are inverted: "umask a=rx" calls umask(222) */ |
| 11824 | if (!isdigit(argv[0][0])) |
| 11825 | mask ^= 0777; |
| 11826 | mask = bb_parse_mode(argv[0], mask); |
| 11827 | if (!isdigit(argv[0][0])) |
| 11828 | mask ^= 0777; |
| 11829 | if ((unsigned)mask > 0777) { |
| 11830 | mask = old_mask; |
| 11831 | /* bash messages: |
| 11832 | * bash: umask: 'q': invalid symbolic mode operator |
| 11833 | * bash: umask: 999: octal number out of range |
| 11834 | */ |
| 11835 | bb_error_msg("%s: invalid mode '%s'", "umask", argv[0]); |
| 11836 | rc = 0; |
| 11837 | } |
| 11838 | } else { |
| 11839 | /* Mimic bash */ |
| 11840 | printf("%04o\n", (unsigned) mask); |
| 11841 | /* fall through and restore mask which we set to 0 */ |
| 11842 | } |
| 11843 | umask(mask); |
| 11844 | |
| 11845 | return !rc; /* rc != 0 - success */ |
| 11846 | } |
| 11847 | #endif |
| 11848 | |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 11849 | #if ENABLE_HUSH_EXPORT || ENABLE_HUSH_READONLY || ENABLE_HUSH_SET || ENABLE_HUSH_TRAP |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 11850 | static void print_escaped(const char *s) |
| 11851 | { |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 11852 | //TODO? bash "set" does not quote variables which contain only alnums and "%+,-./:=@_~", |
| 11853 | // (but "export" quotes all variables, even with only these chars). |
| 11854 | // I think quoting strings with %+,=~ looks better |
| 11855 | // (example: "set" printing var== instead of var='=' looks strange) |
| 11856 | // IOW: do not quote "-./:@_": / is used in pathnames, : in PATH, -._ often in file names, @ in emails |
| 11857 | |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 11858 | if (*s == '\'') |
| 11859 | goto squote; |
| 11860 | do { |
| 11861 | const char *p = strchrnul(s, '\''); |
| 11862 | /* print 'xxxx', possibly just '' */ |
| 11863 | printf("'%.*s'", (int)(p - s), s); |
| 11864 | if (*p == '\0') |
| 11865 | break; |
| 11866 | s = p; |
| 11867 | squote: |
| 11868 | /* s points to '; print "'''...'''" */ |
| 11869 | putchar('"'); |
| 11870 | do putchar('\''); while (*++s == '\''); |
| 11871 | putchar('"'); |
| 11872 | } while (*s); |
| 11873 | } |
| 11874 | #endif |
| 11875 | |
| 11876 | #if ENABLE_HUSH_EXPORT || ENABLE_HUSH_LOCAL || ENABLE_HUSH_READONLY |
| 11877 | static int helper_export_local(char **argv, unsigned flags) |
| 11878 | { |
| 11879 | do { |
| 11880 | char *name = *argv; |
| 11881 | const char *name_end = endofname(name); |
| 11882 | |
| 11883 | if (*name_end == '\0') { |
| 11884 | struct variable *var, **vpp; |
| 11885 | |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 11886 | vpp = get_ptr_to_local_var(name); |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 11887 | var = vpp ? *vpp : NULL; |
| 11888 | |
| 11889 | if (flags & SETFLAG_UNEXPORT) { |
| 11890 | /* export -n NAME (without =VALUE) */ |
| 11891 | if (var) { |
| 11892 | var->flg_export = 0; |
| 11893 | debug_printf_env("%s: unsetenv '%s'\n", __func__, name); |
| 11894 | unsetenv(name); |
| 11895 | } /* else: export -n NOT_EXISTING_VAR: no-op */ |
| 11896 | continue; |
| 11897 | } |
| 11898 | if (flags & SETFLAG_EXPORT) { |
| 11899 | /* export NAME (without =VALUE) */ |
| 11900 | if (var) { |
| 11901 | var->flg_export = 1; |
| 11902 | debug_printf_env("%s: putenv '%s'\n", __func__, var->varstr); |
| 11903 | putenv(var->varstr); |
| 11904 | continue; |
| 11905 | } |
| 11906 | } |
| 11907 | if (flags & SETFLAG_MAKE_RO) { |
| 11908 | /* readonly NAME (without =VALUE) */ |
| 11909 | if (var) { |
| 11910 | var->flg_read_only = 1; |
| 11911 | continue; |
| 11912 | } |
| 11913 | } |
| 11914 | # if ENABLE_HUSH_LOCAL |
| 11915 | /* Is this "local" bltin? */ |
| 11916 | if (!(flags & (SETFLAG_EXPORT|SETFLAG_UNEXPORT|SETFLAG_MAKE_RO))) { |
| 11917 | unsigned lvl = flags >> SETFLAG_VARLVL_SHIFT; |
| 11918 | if (var && var->var_nest_level == lvl) { |
| 11919 | /* "local x=abc; ...; local x" - ignore second local decl */ |
| 11920 | continue; |
| 11921 | } |
| 11922 | } |
| 11923 | # endif |
| 11924 | /* Exporting non-existing variable. |
| 11925 | * bash does not put it in environment, |
| 11926 | * but remembers that it is exported, |
| 11927 | * and does put it in env when it is set later. |
| 11928 | * We just set it to "" and export. |
| 11929 | */ |
| 11930 | /* Or, it's "local NAME" (without =VALUE). |
| 11931 | * bash sets the value to "". |
| 11932 | */ |
| 11933 | /* Or, it's "readonly NAME" (without =VALUE). |
| 11934 | * bash remembers NAME and disallows its creation |
| 11935 | * in the future. |
| 11936 | */ |
| 11937 | name = xasprintf("%s=", name); |
| 11938 | } else { |
| 11939 | if (*name_end != '=') { |
| 11940 | bb_error_msg("'%s': bad variable name", name); |
| 11941 | /* do not parse following argv[]s: */ |
| 11942 | return 1; |
| 11943 | } |
| 11944 | /* (Un)exporting/making local NAME=VALUE */ |
| 11945 | name = xstrdup(name); |
| 11946 | /* Testcase: export PS1='\w \$ ' */ |
| 11947 | unbackslash(name); |
| 11948 | } |
| 11949 | debug_printf_env("%s: set_local_var('%s')\n", __func__, name); |
| 11950 | if (set_local_var(name, flags)) |
| 11951 | return EXIT_FAILURE; |
| 11952 | } while (*++argv); |
| 11953 | return EXIT_SUCCESS; |
| 11954 | } |
| 11955 | #endif |
| 11956 | |
| 11957 | #if ENABLE_HUSH_EXPORT |
| 11958 | static int FAST_FUNC builtin_export(char **argv) |
| 11959 | { |
| 11960 | unsigned opt_unexport; |
| 11961 | |
| 11962 | # if ENABLE_HUSH_EXPORT_N |
| 11963 | /* "!": do not abort on errors */ |
| 11964 | opt_unexport = getopt32(argv, "!n"); |
| 11965 | if (opt_unexport == (uint32_t)-1) |
| 11966 | return EXIT_FAILURE; |
| 11967 | argv += optind; |
| 11968 | # else |
| 11969 | opt_unexport = 0; |
| 11970 | argv++; |
| 11971 | # endif |
| 11972 | |
| 11973 | if (argv[0] == NULL) { |
| 11974 | char **e = environ; |
| 11975 | if (e) { |
| 11976 | while (*e) { |
| 11977 | # if 0 |
| 11978 | puts(*e++); |
| 11979 | # else |
| 11980 | /* ash emits: export VAR='VAL' |
| 11981 | * bash: declare -x VAR="VAL" |
| 11982 | * we follow ash example */ |
| 11983 | const char *s = *e++; |
| 11984 | const char *p = strchr(s, '='); |
| 11985 | |
| 11986 | if (!p) /* wtf? take next variable */ |
| 11987 | continue; |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 11988 | /* "export VAR=" */ |
| 11989 | printf("%s %.*s", "export", (int)(p - s) + 1, s); |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 11990 | print_escaped(p + 1); |
| 11991 | putchar('\n'); |
| 11992 | # endif |
| 11993 | } |
| 11994 | /*fflush_all(); - done after each builtin anyway */ |
| 11995 | } |
| 11996 | return EXIT_SUCCESS; |
| 11997 | } |
| 11998 | |
| 11999 | return helper_export_local(argv, opt_unexport ? SETFLAG_UNEXPORT : SETFLAG_EXPORT); |
| 12000 | } |
| 12001 | #endif |
| 12002 | |
| 12003 | #if ENABLE_HUSH_LOCAL |
| 12004 | static int FAST_FUNC builtin_local(char **argv) |
| 12005 | { |
| 12006 | if (G.func_nest_level == 0) { |
| 12007 | bb_error_msg("%s: not in a function", argv[0]); |
| 12008 | return EXIT_FAILURE; /* bash compat */ |
| 12009 | } |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 12010 | //TODO? ash and bash support "local -" special form, |
| 12011 | //which saves/restores $- around function call (including async returns, such as ^C) |
| 12012 | //(IOW: it makes "set +/-..." effects local) |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 12013 | argv++; |
| 12014 | /* Since all builtins run in a nested variable level, |
| 12015 | * need to use level - 1 here. Or else the variable will be removed at once |
| 12016 | * after builtin returns. |
| 12017 | */ |
| 12018 | return helper_export_local(argv, (G.var_nest_level - 1) << SETFLAG_VARLVL_SHIFT); |
| 12019 | } |
| 12020 | #endif |
| 12021 | |
| 12022 | #if ENABLE_HUSH_READONLY |
| 12023 | static int FAST_FUNC builtin_readonly(char **argv) |
| 12024 | { |
| 12025 | argv++; |
| 12026 | if (*argv == NULL) { |
| 12027 | /* bash: readonly [-p]: list all readonly VARs |
| 12028 | * (-p has no effect in bash) |
| 12029 | */ |
| 12030 | struct variable *e; |
| 12031 | for (e = G.top_var; e; e = e->next) { |
| 12032 | if (e->flg_read_only) { |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 12033 | const char *s = e->varstr; |
| 12034 | const char *p = strchr(s, '='); |
| 12035 | |
| 12036 | if (!p) /* wtf? take next variable */ |
| 12037 | continue; |
| 12038 | /* "readonly VAR=" */ |
| 12039 | printf("%s %.*s", "readonly", (int)(p - s) + 1, s); |
| 12040 | print_escaped(p + 1); |
| 12041 | putchar('\n'); |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 12042 | } |
| 12043 | } |
| 12044 | return EXIT_SUCCESS; |
| 12045 | } |
| 12046 | return helper_export_local(argv, SETFLAG_MAKE_RO); |
| 12047 | } |
| 12048 | #endif |
| 12049 | |
| 12050 | #if ENABLE_HUSH_UNSET |
| 12051 | /* http://www.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#unset */ |
| 12052 | static int FAST_FUNC builtin_unset(char **argv) |
| 12053 | { |
| 12054 | int ret; |
| 12055 | unsigned opts; |
| 12056 | |
| 12057 | /* "!": do not abort on errors */ |
| 12058 | /* "+": stop at 1st non-option */ |
| 12059 | opts = getopt32(argv, "!+vf"); |
| 12060 | if (opts == (unsigned)-1) |
| 12061 | return EXIT_FAILURE; |
| 12062 | if (opts == 3) { |
| 12063 | bb_simple_error_msg("unset: -v and -f are exclusive"); |
| 12064 | return EXIT_FAILURE; |
| 12065 | } |
| 12066 | argv += optind; |
| 12067 | |
| 12068 | ret = EXIT_SUCCESS; |
| 12069 | while (*argv) { |
| 12070 | if (!(opts & 2)) { /* not -f */ |
| 12071 | if (unset_local_var(*argv)) { |
| 12072 | /* unset <nonexistent_var> doesn't fail. |
| 12073 | * Error is when one tries to unset RO var. |
| 12074 | * Message was printed by unset_local_var. */ |
| 12075 | ret = EXIT_FAILURE; |
| 12076 | } |
| 12077 | } |
| 12078 | # if ENABLE_HUSH_FUNCTIONS |
| 12079 | else { |
| 12080 | unset_func(*argv); |
| 12081 | } |
| 12082 | # endif |
| 12083 | argv++; |
| 12084 | } |
| 12085 | return ret; |
| 12086 | } |
| 12087 | #endif |
| 12088 | |
| 12089 | #if ENABLE_HUSH_SET |
| 12090 | /* http://www.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#set |
| 12091 | * built-in 'set' handler |
| 12092 | * SUSv3 says: |
| 12093 | * set [-abCefhmnuvx] [-o option] [argument...] |
| 12094 | * set [+abCefhmnuvx] [+o option] [argument...] |
| 12095 | * set -- [argument...] |
| 12096 | * set -o |
| 12097 | * set +o |
| 12098 | * Implementations shall support the options in both their hyphen and |
| 12099 | * plus-sign forms. These options can also be specified as options to sh. |
| 12100 | * Examples: |
| 12101 | * Write out all variables and their values: set |
| 12102 | * Set $1, $2, and $3 and set "$#" to 3: set c a b |
| 12103 | * Turn on the -x and -v options: set -xv |
| 12104 | * Unset all positional parameters: set -- |
| 12105 | * Set $1 to the value of x, even if it begins with '-' or '+': set -- "$x" |
| 12106 | * Set the positional parameters to the expansion of x, even if x expands |
| 12107 | * with a leading '-' or '+': set -- $x |
| 12108 | * |
| 12109 | * So far, we only support "set -- [argument...]" and some of the short names. |
| 12110 | */ |
| 12111 | static int FAST_FUNC builtin_set(char **argv) |
| 12112 | { |
| 12113 | int n; |
| 12114 | char **pp, **g_argv; |
| 12115 | char *arg = *++argv; |
| 12116 | |
| 12117 | if (arg == NULL) { |
| 12118 | struct variable *e; |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 12119 | for (e = G.top_var; e; e = e->next) { |
| 12120 | const char *s = e->varstr; |
| 12121 | const char *p = strchr(s, '='); |
| 12122 | |
| 12123 | if (!p) /* wtf? take next variable */ |
| 12124 | continue; |
| 12125 | /* var= */ |
| 12126 | printf("%.*s", (int)(p - s) + 1, s); |
| 12127 | print_escaped(p + 1); |
| 12128 | putchar('\n'); |
| 12129 | } |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 12130 | return EXIT_SUCCESS; |
| 12131 | } |
| 12132 | |
| 12133 | do { |
| 12134 | if (strcmp(arg, "--") == 0) { |
| 12135 | ++argv; |
| 12136 | goto set_argv; |
| 12137 | } |
| 12138 | if (arg[0] != '+' && arg[0] != '-') |
| 12139 | break; |
| 12140 | for (n = 1; arg[n]; ++n) { |
| 12141 | if (set_mode((arg[0] == '-'), arg[n], argv[1])) { |
| 12142 | bb_error_msg("%s: %s: invalid option", "set", arg); |
| 12143 | return EXIT_FAILURE; |
| 12144 | } |
| 12145 | if (arg[n] == 'o' && argv[1]) |
| 12146 | argv++; |
| 12147 | } |
| 12148 | } while ((arg = *++argv) != NULL); |
| 12149 | /* Now argv[0] is 1st argument */ |
| 12150 | |
| 12151 | if (arg == NULL) |
| 12152 | return EXIT_SUCCESS; |
| 12153 | set_argv: |
| 12154 | |
| 12155 | /* NB: G.global_argv[0] ($0) is never freed/changed */ |
| 12156 | g_argv = G.global_argv; |
| 12157 | if (G.global_args_malloced) { |
| 12158 | pp = g_argv; |
| 12159 | while (*++pp) |
| 12160 | free(*pp); |
| 12161 | g_argv[1] = NULL; |
| 12162 | } else { |
| 12163 | G.global_args_malloced = 1; |
| 12164 | pp = xzalloc(sizeof(pp[0]) * 2); |
| 12165 | pp[0] = g_argv[0]; /* retain $0 */ |
| 12166 | g_argv = pp; |
| 12167 | } |
| 12168 | /* This realloc's G.global_argv */ |
| 12169 | G.global_argv = pp = add_strings_to_strings(g_argv, argv, /*dup:*/ 1); |
| 12170 | |
| 12171 | G.global_argc = 1 + string_array_len(pp + 1); |
| 12172 | |
| 12173 | return EXIT_SUCCESS; |
| 12174 | } |
| 12175 | #endif |
| 12176 | |
| 12177 | static int FAST_FUNC builtin_shift(char **argv) |
| 12178 | { |
| 12179 | int n = 1; |
| 12180 | argv = skip_dash_dash(argv); |
| 12181 | if (argv[0]) { |
| 12182 | n = bb_strtou(argv[0], NULL, 10); |
| 12183 | if (errno || n < 0) { |
| 12184 | /* shared string with ash.c */ |
| 12185 | bb_error_msg("Illegal number: %s", argv[0]); |
| 12186 | /* |
| 12187 | * ash aborts in this case. |
| 12188 | * bash prints error message and set $? to 1. |
| 12189 | * Interestingly, for "shift 99999" bash does not |
| 12190 | * print error message, but does set $? to 1 |
| 12191 | * (and does no shifting at all). |
| 12192 | */ |
| 12193 | } |
| 12194 | } |
| 12195 | if (n >= 0 && n < G.global_argc) { |
| 12196 | if (G_global_args_malloced) { |
| 12197 | int m = 1; |
| 12198 | while (m <= n) |
| 12199 | free(G.global_argv[m++]); |
| 12200 | } |
| 12201 | G.global_argc -= n; |
| 12202 | memmove(&G.global_argv[1], &G.global_argv[n+1], |
| 12203 | G.global_argc * sizeof(G.global_argv[0])); |
| 12204 | return EXIT_SUCCESS; |
| 12205 | } |
| 12206 | return EXIT_FAILURE; |
| 12207 | } |
| 12208 | |
| 12209 | #if ENABLE_HUSH_GETOPTS |
| 12210 | static int FAST_FUNC builtin_getopts(char **argv) |
| 12211 | { |
| 12212 | /* http://pubs.opengroup.org/onlinepubs/9699919799/utilities/getopts.html |
| 12213 | |
| 12214 | TODO: |
| 12215 | If a required argument is not found, and getopts is not silent, |
| 12216 | a question mark (?) is placed in VAR, OPTARG is unset, and a |
| 12217 | diagnostic message is printed. If getopts is silent, then a |
| 12218 | colon (:) is placed in VAR and OPTARG is set to the option |
| 12219 | character found. |
| 12220 | |
| 12221 | Test that VAR is a valid variable name? |
| 12222 | |
| 12223 | "Whenever the shell is invoked, OPTIND shall be initialized to 1" |
| 12224 | */ |
| 12225 | char cbuf[2]; |
| 12226 | const char *cp, *optstring, *var; |
| 12227 | int c, n, exitcode, my_opterr; |
| 12228 | unsigned count; |
| 12229 | |
| 12230 | optstring = *++argv; |
| 12231 | if (!optstring || !(var = *++argv)) { |
| 12232 | bb_simple_error_msg("usage: getopts OPTSTRING VAR [ARGS]"); |
| 12233 | return EXIT_FAILURE; |
| 12234 | } |
| 12235 | |
| 12236 | if (argv[1]) |
| 12237 | argv[0] = G.global_argv[0]; /* for error messages in getopt() */ |
| 12238 | else |
| 12239 | argv = G.global_argv; |
| 12240 | cbuf[1] = '\0'; |
| 12241 | |
| 12242 | my_opterr = 0; |
| 12243 | if (optstring[0] != ':') { |
| 12244 | cp = get_local_var_value("OPTERR"); |
| 12245 | /* 0 if "OPTERR=0", 1 otherwise */ |
| 12246 | my_opterr = (!cp || NOT_LONE_CHAR(cp, '0')); |
| 12247 | } |
| 12248 | |
| 12249 | /* getopts stops on first non-option. Add "+" to force that */ |
| 12250 | /*if (optstring[0] != '+')*/ { |
| 12251 | char *s = alloca(strlen(optstring) + 2); |
| 12252 | sprintf(s, "+%s", optstring); |
| 12253 | optstring = s; |
| 12254 | } |
| 12255 | |
| 12256 | /* Naively, now we should just |
| 12257 | * cp = get_local_var_value("OPTIND"); |
| 12258 | * optind = cp ? atoi(cp) : 0; |
| 12259 | * optarg = NULL; |
| 12260 | * opterr = my_opterr; |
| 12261 | * c = getopt(string_array_len(argv), argv, optstring); |
| 12262 | * and be done? Not so fast... |
| 12263 | * Unlike normal getopt() usage in C programs, here |
| 12264 | * each successive call will (usually) have the same argv[] CONTENTS, |
| 12265 | * but not the ADDRESSES. Worse yet, it's possible that between |
| 12266 | * invocations of "getopts", there will be calls to shell builtins |
| 12267 | * which use getopt() internally. Example: |
| 12268 | * while getopts "abc" RES -a -bc -abc de; do |
| 12269 | * unset -ff func |
| 12270 | * done |
| 12271 | * This would not work correctly: getopt() call inside "unset" |
| 12272 | * modifies internal libc state which is tracking position in |
| 12273 | * multi-option strings ("-abc"). At best, it can skip options |
| 12274 | * or return the same option infinitely. With glibc implementation |
| 12275 | * of getopt(), it would use outright invalid pointers and return |
| 12276 | * garbage even _without_ "unset" mangling internal state. |
| 12277 | * |
| 12278 | * We resort to resetting getopt() state and calling it N times, |
| 12279 | * until we get Nth result (or failure). |
| 12280 | * (N == G.getopt_count is reset to 0 whenever OPTIND is [un]set). |
| 12281 | */ |
| 12282 | GETOPT_RESET(); |
| 12283 | count = 0; |
| 12284 | n = string_array_len(argv); |
| 12285 | do { |
| 12286 | optarg = NULL; |
| 12287 | opterr = (count < G.getopt_count) ? 0 : my_opterr; |
| 12288 | c = getopt(n, argv, optstring); |
| 12289 | if (c < 0) |
| 12290 | break; |
| 12291 | count++; |
| 12292 | } while (count <= G.getopt_count); |
| 12293 | |
| 12294 | /* Set OPTIND. Prevent resetting of the magic counter! */ |
| 12295 | set_local_var_from_halves("OPTIND", utoa(optind)); |
| 12296 | G.getopt_count = count; /* "next time, give me N+1'th result" */ |
| 12297 | GETOPT_RESET(); /* just in case */ |
| 12298 | |
| 12299 | /* Set OPTARG */ |
| 12300 | /* Always set or unset, never left as-is, even on exit/error: |
| 12301 | * "If no option was found, or if the option that was found |
| 12302 | * does not have an option-argument, OPTARG shall be unset." |
| 12303 | */ |
| 12304 | cp = optarg; |
| 12305 | if (c == '?') { |
| 12306 | /* If ":optstring" and unknown option is seen, |
| 12307 | * it is stored to OPTARG. |
| 12308 | */ |
| 12309 | if (optstring[1] == ':') { |
| 12310 | cbuf[0] = optopt; |
| 12311 | cp = cbuf; |
| 12312 | } |
| 12313 | } |
| 12314 | if (cp) |
| 12315 | set_local_var_from_halves("OPTARG", cp); |
| 12316 | else |
| 12317 | unset_local_var("OPTARG"); |
| 12318 | |
| 12319 | /* Convert -1 to "?" */ |
| 12320 | exitcode = EXIT_SUCCESS; |
| 12321 | if (c < 0) { /* -1: end of options */ |
| 12322 | exitcode = EXIT_FAILURE; |
| 12323 | c = '?'; |
| 12324 | } |
| 12325 | |
| 12326 | /* Set VAR */ |
| 12327 | cbuf[0] = c; |
| 12328 | set_local_var_from_halves(var, cbuf); |
| 12329 | |
| 12330 | return exitcode; |
| 12331 | } |
| 12332 | #endif |
| 12333 | |
| 12334 | static int FAST_FUNC builtin_source(char **argv) |
| 12335 | { |
| 12336 | char *arg_path, *filename; |
| 12337 | HFILE *input; |
| 12338 | save_arg_t sv; |
| 12339 | char *args_need_save; |
| 12340 | #if ENABLE_HUSH_FUNCTIONS |
| 12341 | smallint sv_flg; |
| 12342 | #endif |
| 12343 | |
| 12344 | argv = skip_dash_dash(argv); |
| 12345 | filename = argv[0]; |
| 12346 | if (!filename) { |
| 12347 | /* bash says: "bash: .: filename argument required" */ |
| 12348 | return 2; /* bash compat */ |
| 12349 | } |
| 12350 | arg_path = NULL; |
| 12351 | if (!strchr(filename, '/')) { |
| 12352 | arg_path = find_in_path(filename); |
| 12353 | if (arg_path) |
| 12354 | filename = arg_path; |
| 12355 | else if (!ENABLE_HUSH_BASH_SOURCE_CURDIR) { |
| 12356 | errno = ENOENT; |
| 12357 | bb_simple_perror_msg(filename); |
| 12358 | return EXIT_FAILURE; |
| 12359 | } |
| 12360 | } |
| 12361 | input = hfopen(filename); |
| 12362 | free(arg_path); |
| 12363 | if (!input) { |
| 12364 | bb_perror_msg("%s", filename); |
| 12365 | /* POSIX: non-interactive shell should abort here, |
| 12366 | * not merely fail. So far no one complained :) |
| 12367 | */ |
| 12368 | return EXIT_FAILURE; |
| 12369 | } |
| 12370 | |
| 12371 | #if ENABLE_HUSH_FUNCTIONS |
| 12372 | sv_flg = G_flag_return_in_progress; |
| 12373 | /* "we are inside sourced file, ok to use return" */ |
| 12374 | G_flag_return_in_progress = -1; |
| 12375 | #endif |
| 12376 | args_need_save = argv[1]; /* used as a boolean variable */ |
| 12377 | if (args_need_save) |
| 12378 | save_and_replace_G_args(&sv, argv); |
| 12379 | |
| 12380 | /* "false; . ./empty_line; echo Zero:$?" should print 0 */ |
| 12381 | G.last_exitcode = 0; |
| 12382 | parse_and_run_file(input); |
| 12383 | hfclose(input); |
| 12384 | |
| 12385 | if (args_need_save) /* can't use argv[1] instead: "shift" can mangle it */ |
| 12386 | restore_G_args(&sv, argv); |
| 12387 | #if ENABLE_HUSH_FUNCTIONS |
| 12388 | G_flag_return_in_progress = sv_flg; |
| 12389 | #endif |
| 12390 | |
| 12391 | return G.last_exitcode; |
| 12392 | } |
| 12393 | |
| 12394 | #if ENABLE_HUSH_TRAP |
| 12395 | static int FAST_FUNC builtin_trap(char **argv) |
| 12396 | { |
| 12397 | int sig; |
| 12398 | char *new_cmd; |
| 12399 | |
| 12400 | if (!G_traps) |
| 12401 | G_traps = xzalloc(sizeof(G_traps[0]) * NSIG); |
| 12402 | |
| 12403 | argv++; |
| 12404 | if (!*argv) { |
| 12405 | int i; |
| 12406 | /* No args: print all trapped */ |
| 12407 | for (i = 0; i < NSIG; ++i) { |
| 12408 | if (G_traps[i]) { |
| 12409 | printf("trap -- "); |
| 12410 | print_escaped(G_traps[i]); |
| 12411 | /* note: bash adds "SIG", but only if invoked |
| 12412 | * as "bash". If called as "sh", or if set -o posix, |
| 12413 | * then it prints short signal names. |
| 12414 | * We are printing short names: */ |
| 12415 | printf(" %s\n", get_signame(i)); |
| 12416 | } |
| 12417 | } |
| 12418 | /*fflush_all(); - done after each builtin anyway */ |
| 12419 | return EXIT_SUCCESS; |
| 12420 | } |
| 12421 | |
| 12422 | new_cmd = NULL; |
| 12423 | /* If first arg is a number: reset all specified signals */ |
| 12424 | sig = bb_strtou(*argv, NULL, 10); |
| 12425 | if (errno == 0) { |
| 12426 | int ret; |
| 12427 | process_sig_list: |
| 12428 | ret = EXIT_SUCCESS; |
| 12429 | while (*argv) { |
| 12430 | sighandler_t handler; |
| 12431 | |
| 12432 | sig = get_signum(*argv++); |
| 12433 | if (sig < 0) { |
| 12434 | ret = EXIT_FAILURE; |
| 12435 | /* Mimic bash message exactly */ |
| 12436 | bb_error_msg("trap: %s: invalid signal specification", argv[-1]); |
| 12437 | continue; |
| 12438 | } |
| 12439 | |
| 12440 | free(G_traps[sig]); |
| 12441 | G_traps[sig] = xstrdup(new_cmd); |
| 12442 | |
| 12443 | debug_printf("trap: setting SIG%s (%i) to '%s'\n", |
| 12444 | get_signame(sig), sig, G_traps[sig]); |
| 12445 | |
| 12446 | /* There is no signal for 0 (EXIT) */ |
| 12447 | if (sig == 0) |
| 12448 | continue; |
| 12449 | |
| 12450 | if (new_cmd) |
| 12451 | handler = (new_cmd[0] ? record_pending_signo : SIG_IGN); |
| 12452 | else |
| 12453 | /* We are removing trap handler */ |
| 12454 | handler = pick_sighandler(sig); |
| 12455 | install_sighandler(sig, handler); |
| 12456 | } |
| 12457 | return ret; |
| 12458 | } |
| 12459 | |
| 12460 | if (!argv[1]) { /* no second arg */ |
| 12461 | bb_simple_error_msg("trap: invalid arguments"); |
| 12462 | return EXIT_FAILURE; |
| 12463 | } |
| 12464 | |
| 12465 | /* First arg is "-": reset all specified to default */ |
| 12466 | /* First arg is "--": skip it, the rest is "handler SIGs..." */ |
| 12467 | /* Everything else: set arg as signal handler |
| 12468 | * (includes "" case, which ignores signal) */ |
| 12469 | if (argv[0][0] == '-') { |
| 12470 | if (argv[0][1] == '\0') { /* "-" */ |
| 12471 | /* new_cmd remains NULL: "reset these sigs" */ |
| 12472 | goto reset_traps; |
| 12473 | } |
| 12474 | if (argv[0][1] == '-' && argv[0][2] == '\0') { /* "--" */ |
| 12475 | argv++; |
| 12476 | } |
| 12477 | /* else: "-something", no special meaning */ |
| 12478 | } |
| 12479 | new_cmd = *argv; |
| 12480 | reset_traps: |
| 12481 | argv++; |
| 12482 | goto process_sig_list; |
| 12483 | } |
| 12484 | #endif |
| 12485 | |
| 12486 | #if ENABLE_HUSH_JOB |
| 12487 | static struct pipe *parse_jobspec(const char *str) |
| 12488 | { |
| 12489 | struct pipe *pi; |
| 12490 | unsigned jobnum; |
| 12491 | |
| 12492 | if (sscanf(str, "%%%u", &jobnum) != 1) { |
| 12493 | if (str[0] != '%' |
| 12494 | || (str[1] != '%' && str[1] != '+' && str[1] != '\0') |
| 12495 | ) { |
| 12496 | bb_error_msg("bad argument '%s'", str); |
| 12497 | return NULL; |
| 12498 | } |
| 12499 | /* It is "%%", "%+" or "%" - current job */ |
| 12500 | jobnum = G.last_jobid; |
| 12501 | if (jobnum == 0) { |
| 12502 | bb_simple_error_msg("no current job"); |
| 12503 | return NULL; |
| 12504 | } |
| 12505 | } |
| 12506 | for (pi = G.job_list; pi; pi = pi->next) { |
| 12507 | if (pi->jobid == jobnum) { |
| 12508 | return pi; |
| 12509 | } |
| 12510 | } |
| 12511 | bb_error_msg("%u: no such job", jobnum); |
| 12512 | return NULL; |
| 12513 | } |
| 12514 | |
| 12515 | static int FAST_FUNC builtin_jobs(char **argv UNUSED_PARAM) |
| 12516 | { |
| 12517 | struct pipe *job; |
| 12518 | const char *status_string; |
| 12519 | |
| 12520 | checkjobs(NULL, 0 /*(no pid to wait for)*/); |
| 12521 | for (job = G.job_list; job; job = job->next) { |
| 12522 | if (job->alive_cmds == job->stopped_cmds) |
| 12523 | status_string = "Stopped"; |
| 12524 | else |
| 12525 | status_string = "Running"; |
| 12526 | |
| 12527 | printf(JOB_STATUS_FORMAT, job->jobid, status_string, job->cmdtext); |
| 12528 | } |
| 12529 | |
| 12530 | clean_up_last_dead_job(); |
| 12531 | |
| 12532 | return EXIT_SUCCESS; |
| 12533 | } |
| 12534 | |
| 12535 | /* built-in 'fg' and 'bg' handler */ |
| 12536 | static int FAST_FUNC builtin_fg_bg(char **argv) |
| 12537 | { |
| 12538 | int i; |
| 12539 | struct pipe *pi; |
| 12540 | |
| 12541 | if (!G_interactive_fd) |
| 12542 | return EXIT_FAILURE; |
| 12543 | |
| 12544 | /* If they gave us no args, assume they want the last backgrounded task */ |
| 12545 | if (!argv[1]) { |
| 12546 | for (pi = G.job_list; pi; pi = pi->next) { |
| 12547 | if (pi->jobid == G.last_jobid) { |
| 12548 | goto found; |
| 12549 | } |
| 12550 | } |
| 12551 | bb_error_msg("%s: no current job", argv[0]); |
| 12552 | return EXIT_FAILURE; |
| 12553 | } |
| 12554 | |
| 12555 | pi = parse_jobspec(argv[1]); |
| 12556 | if (!pi) |
| 12557 | return EXIT_FAILURE; |
| 12558 | found: |
| 12559 | /* TODO: bash prints a string representation |
| 12560 | * of job being foregrounded (like "sleep 1 | cat") */ |
| 12561 | if (argv[0][0] == 'f' && G_saved_tty_pgrp) { |
Francis Laniel | c24cb3e | 2023-12-22 22:02:42 +0100 | [diff] [blame] | 12562 | /* Put the job into the foreground. */ |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 12563 | tcsetpgrp(G_interactive_fd, pi->pgrp); |
| 12564 | } |
| 12565 | |
| 12566 | /* Restart the processes in the job */ |
| 12567 | debug_printf_jobs("reviving %d procs, pgrp %d\n", pi->num_cmds, pi->pgrp); |
| 12568 | for (i = 0; i < pi->num_cmds; i++) { |
| 12569 | debug_printf_jobs("reviving pid %d\n", pi->cmds[i].pid); |
| 12570 | } |
| 12571 | pi->stopped_cmds = 0; |
| 12572 | |
| 12573 | i = kill(- pi->pgrp, SIGCONT); |
| 12574 | if (i < 0) { |
| 12575 | if (errno == ESRCH) { |
| 12576 | delete_finished_job(pi); |
| 12577 | return EXIT_SUCCESS; |
| 12578 | } |
| 12579 | bb_simple_perror_msg("kill (SIGCONT)"); |
| 12580 | } |
| 12581 | |
| 12582 | if (argv[0][0] == 'f') { |
| 12583 | remove_job_from_table(pi); /* FG job shouldn't be in job table */ |
| 12584 | return checkjobs_and_fg_shell(pi); |
| 12585 | } |
| 12586 | return EXIT_SUCCESS; |
| 12587 | } |
| 12588 | #endif |
| 12589 | |
| 12590 | #if ENABLE_HUSH_KILL |
| 12591 | static int FAST_FUNC builtin_kill(char **argv) |
| 12592 | { |
| 12593 | int ret = 0; |
| 12594 | |
| 12595 | # if ENABLE_HUSH_JOB |
| 12596 | if (argv[1] && strcmp(argv[1], "-l") != 0) { |
| 12597 | int i = 1; |
| 12598 | |
| 12599 | do { |
| 12600 | struct pipe *pi; |
| 12601 | char *dst; |
| 12602 | int j, n; |
| 12603 | |
| 12604 | if (argv[i][0] != '%') |
| 12605 | continue; |
| 12606 | /* |
| 12607 | * "kill %N" - job kill |
| 12608 | * Converting to pgrp / pid kill |
| 12609 | */ |
| 12610 | pi = parse_jobspec(argv[i]); |
| 12611 | if (!pi) { |
| 12612 | /* Eat bad jobspec */ |
| 12613 | j = i; |
| 12614 | do { |
| 12615 | j++; |
| 12616 | argv[j - 1] = argv[j]; |
| 12617 | } while (argv[j]); |
| 12618 | ret = 1; |
| 12619 | i--; |
| 12620 | continue; |
| 12621 | } |
| 12622 | /* |
| 12623 | * In jobs started under job control, we signal |
| 12624 | * entire process group by kill -PGRP_ID. |
| 12625 | * This happens, f.e., in interactive shell. |
| 12626 | * |
| 12627 | * Otherwise, we signal each child via |
| 12628 | * kill PID1 PID2 PID3. |
| 12629 | * Testcases: |
| 12630 | * sh -c 'sleep 1|sleep 1 & kill %1' |
| 12631 | * sh -c 'true|sleep 2 & sleep 1; kill %1' |
| 12632 | * sh -c 'true|sleep 1 & sleep 2; kill %1' |
| 12633 | */ |
| 12634 | n = G_interactive_fd ? 1 : pi->num_cmds; |
| 12635 | dst = alloca(n * sizeof(int)*4); |
| 12636 | argv[i] = dst; |
| 12637 | if (G_interactive_fd) |
| 12638 | dst += sprintf(dst, " -%u", (int)pi->pgrp); |
| 12639 | else for (j = 0; j < n; j++) { |
| 12640 | struct command *cmd = &pi->cmds[j]; |
| 12641 | /* Skip exited members of the job */ |
| 12642 | if (cmd->pid == 0) |
| 12643 | continue; |
| 12644 | /* |
| 12645 | * kill_main has matching code to expect |
| 12646 | * leading space. Needed to not confuse |
| 12647 | * negative pids with "kill -SIGNAL_NO" syntax |
| 12648 | */ |
| 12649 | dst += sprintf(dst, " %u", (int)cmd->pid); |
| 12650 | } |
| 12651 | *dst = '\0'; |
| 12652 | } while (argv[++i]); |
| 12653 | } |
| 12654 | # endif |
| 12655 | |
| 12656 | if (argv[1] || ret == 0) { |
| 12657 | ret = run_applet_main(argv, kill_main); |
| 12658 | } |
| 12659 | /* else: ret = 1, "kill %bad_jobspec" case */ |
| 12660 | return ret; |
| 12661 | } |
| 12662 | #endif |
| 12663 | |
| 12664 | #if ENABLE_HUSH_WAIT |
| 12665 | /* http://www.opengroup.org/onlinepubs/9699919799/utilities/wait.html */ |
| 12666 | # if !ENABLE_HUSH_JOB |
| 12667 | # define wait_for_child_or_signal(pipe,pid) wait_for_child_or_signal(pid) |
| 12668 | # endif |
| 12669 | static int wait_for_child_or_signal(struct pipe *waitfor_pipe, pid_t waitfor_pid) |
| 12670 | { |
| 12671 | int ret = 0; |
| 12672 | for (;;) { |
| 12673 | int sig; |
| 12674 | sigset_t oldset; |
| 12675 | |
| 12676 | if (!sigisemptyset(&G.pending_set)) |
| 12677 | goto check_sig; |
| 12678 | |
| 12679 | /* waitpid is not interruptible by SA_RESTARTed |
| 12680 | * signals which we use. Thus, this ugly dance: |
| 12681 | */ |
| 12682 | |
| 12683 | /* Make sure possible SIGCHLD is stored in kernel's |
| 12684 | * pending signal mask before we call waitpid. |
| 12685 | * Or else we may race with SIGCHLD, lose it, |
| 12686 | * and get stuck in sigsuspend... |
| 12687 | */ |
| 12688 | sigfillset(&oldset); /* block all signals, remember old set */ |
| 12689 | sigprocmask2(SIG_SETMASK, &oldset); |
| 12690 | |
| 12691 | if (!sigisemptyset(&G.pending_set)) { |
| 12692 | /* Crap! we raced with some signal! */ |
| 12693 | goto restore; |
| 12694 | } |
| 12695 | |
| 12696 | /*errno = 0; - checkjobs does this */ |
| 12697 | /* Can't pass waitfor_pipe into checkjobs(): it won't be interruptible */ |
| 12698 | ret = checkjobs(NULL, waitfor_pid); /* waitpid(WNOHANG) inside */ |
| 12699 | debug_printf_exec("checkjobs:%d\n", ret); |
| 12700 | # if ENABLE_HUSH_JOB |
| 12701 | if (waitfor_pipe) { |
| 12702 | int rcode = job_exited_or_stopped(waitfor_pipe); |
| 12703 | debug_printf_exec("job_exited_or_stopped:%d\n", rcode); |
| 12704 | if (rcode >= 0) { |
| 12705 | ret = rcode; |
| 12706 | sigprocmask(SIG_SETMASK, &oldset, NULL); |
| 12707 | break; |
| 12708 | } |
| 12709 | } |
| 12710 | # endif |
| 12711 | /* if ECHILD, there are no children (ret is -1 or 0) */ |
| 12712 | /* if ret == 0, no children changed state */ |
| 12713 | /* if ret != 0, it's exitcode+1 of exited waitfor_pid child */ |
| 12714 | if (errno == ECHILD || ret) { |
| 12715 | ret--; |
| 12716 | if (ret < 0) /* if ECHILD, may need to fix "ret" */ |
| 12717 | ret = 0; |
| 12718 | # if ENABLE_HUSH_BASH_COMPAT |
| 12719 | if (waitfor_pid == -1 && errno == ECHILD) { |
| 12720 | /* exitcode of "wait -n" with no children is 127, not 0 */ |
| 12721 | ret = 127; |
| 12722 | } |
| 12723 | # endif |
| 12724 | sigprocmask(SIG_SETMASK, &oldset, NULL); |
| 12725 | break; |
| 12726 | } |
| 12727 | /* Wait for SIGCHLD or any other signal */ |
| 12728 | /* It is vitally important for sigsuspend that SIGCHLD has non-DFL handler! */ |
| 12729 | /* Note: sigsuspend invokes signal handler */ |
| 12730 | sigsuspend(&oldset); |
| 12731 | /* ^^^ add "sigdelset(&oldset, SIGCHLD)" before sigsuspend |
| 12732 | * to make sure SIGCHLD is not masked off? |
| 12733 | * It was reported that this: |
| 12734 | * fn() { : | return; } |
| 12735 | * shopt -s lastpipe |
| 12736 | * fn |
| 12737 | * exec hush SCRIPT |
| 12738 | * under bash 4.4.23 runs SCRIPT with SIGCHLD masked, |
| 12739 | * making "wait" commands in SCRIPT block forever. |
| 12740 | */ |
| 12741 | restore: |
| 12742 | sigprocmask(SIG_SETMASK, &oldset, NULL); |
| 12743 | check_sig: |
| 12744 | /* So, did we get a signal? */ |
| 12745 | sig = check_and_run_traps(); |
| 12746 | if (sig /*&& sig != SIGCHLD - always true */) { |
| 12747 | /* Do this for any (non-ignored) signal, not only for ^C */ |
| 12748 | ret = 128 | sig; |
| 12749 | break; |
| 12750 | } |
| 12751 | /* SIGCHLD, or no signal, or ignored one, such as SIGQUIT. Repeat */ |
| 12752 | } |
| 12753 | return ret; |
| 12754 | } |
| 12755 | |
| 12756 | static int FAST_FUNC builtin_wait(char **argv) |
| 12757 | { |
| 12758 | int ret; |
| 12759 | int status; |
| 12760 | |
| 12761 | argv = skip_dash_dash(argv); |
| 12762 | # if ENABLE_HUSH_BASH_COMPAT |
| 12763 | if (argv[0] && strcmp(argv[0], "-n") == 0) { |
| 12764 | /* wait -n */ |
| 12765 | /* (bash accepts "wait -n PID" too and ignores PID) */ |
| 12766 | G.dead_job_exitcode = -1; |
| 12767 | return wait_for_child_or_signal(NULL, -1 /*no job, wait for one job*/); |
| 12768 | } |
| 12769 | # endif |
| 12770 | if (argv[0] == NULL) { |
| 12771 | /* Don't care about wait results */ |
| 12772 | /* Note 1: must wait until there are no more children */ |
| 12773 | /* Note 2: must be interruptible */ |
| 12774 | /* Examples: |
| 12775 | * $ sleep 3 & sleep 6 & wait |
| 12776 | * [1] 30934 sleep 3 |
| 12777 | * [2] 30935 sleep 6 |
| 12778 | * [1] Done sleep 3 |
| 12779 | * [2] Done sleep 6 |
| 12780 | * $ sleep 3 & sleep 6 & wait |
| 12781 | * [1] 30936 sleep 3 |
| 12782 | * [2] 30937 sleep 6 |
| 12783 | * [1] Done sleep 3 |
| 12784 | * ^C <-- after ~4 sec from keyboard |
| 12785 | * $ |
| 12786 | */ |
| 12787 | return wait_for_child_or_signal(NULL, 0 /*no job and no pid to wait for*/); |
| 12788 | } |
| 12789 | |
| 12790 | do { |
| 12791 | pid_t pid = bb_strtou(*argv, NULL, 10); |
| 12792 | if (errno || pid <= 0) { |
| 12793 | # if ENABLE_HUSH_JOB |
| 12794 | if (argv[0][0] == '%') { |
| 12795 | struct pipe *wait_pipe; |
| 12796 | ret = 127; /* bash compat for bad jobspecs */ |
| 12797 | wait_pipe = parse_jobspec(*argv); |
| 12798 | if (wait_pipe) { |
| 12799 | ret = job_exited_or_stopped(wait_pipe); |
| 12800 | if (ret < 0) { |
| 12801 | ret = wait_for_child_or_signal(wait_pipe, 0); |
| 12802 | } else { |
| 12803 | /* waiting on "last dead job" removes it */ |
| 12804 | clean_up_last_dead_job(); |
| 12805 | } |
| 12806 | } |
| 12807 | /* else: parse_jobspec() already emitted error msg */ |
| 12808 | continue; |
| 12809 | } |
| 12810 | # endif |
| 12811 | /* mimic bash message */ |
| 12812 | bb_error_msg("wait: '%s': not a pid or valid job spec", *argv); |
| 12813 | ret = EXIT_FAILURE; |
| 12814 | continue; /* bash checks all argv[] */ |
| 12815 | } |
| 12816 | |
| 12817 | /* Do we have such child? */ |
| 12818 | ret = waitpid(pid, &status, WNOHANG); |
| 12819 | if (ret < 0) { |
| 12820 | /* No */ |
| 12821 | ret = 127; |
| 12822 | if (errno == ECHILD) { |
| 12823 | if (pid == G.last_bg_pid) { |
| 12824 | /* "wait $!" but last bg task has already exited. Try: |
| 12825 | * (sleep 1; exit 3) & sleep 2; echo $?; wait $!; echo $? |
| 12826 | * In bash it prints exitcode 0, then 3. |
| 12827 | * In dash, it is 127. |
| 12828 | */ |
| 12829 | ret = G.last_bg_pid_exitcode; |
| 12830 | } else { |
| 12831 | /* Example: "wait 1". mimic bash message */ |
| 12832 | bb_error_msg("wait: pid %u is not a child of this shell", (unsigned)pid); |
| 12833 | } |
| 12834 | } else { |
| 12835 | /* ??? */ |
| 12836 | bb_perror_msg("wait %s", *argv); |
| 12837 | } |
| 12838 | continue; /* bash checks all argv[] */ |
| 12839 | } |
| 12840 | if (ret == 0) { |
| 12841 | /* Yes, and it still runs */ |
| 12842 | ret = wait_for_child_or_signal(NULL, pid); |
| 12843 | } else { |
| 12844 | /* Yes, and it just exited */ |
| 12845 | process_wait_result(NULL, pid, status); |
| 12846 | ret = WEXITSTATUS(status); |
| 12847 | if (WIFSIGNALED(status)) |
| 12848 | ret = 128 | WTERMSIG(status); |
| 12849 | } |
| 12850 | } while (*++argv); |
| 12851 | |
| 12852 | return ret; |
| 12853 | } |
| 12854 | #endif |
| 12855 | |
| 12856 | #if ENABLE_HUSH_LOOPS || ENABLE_HUSH_FUNCTIONS |
| 12857 | static unsigned parse_numeric_argv1(char **argv, unsigned def, unsigned def_min) |
| 12858 | { |
| 12859 | if (argv[1]) { |
| 12860 | def = bb_strtou(argv[1], NULL, 10); |
| 12861 | if (errno || def < def_min || argv[2]) { |
| 12862 | bb_error_msg("%s: bad arguments", argv[0]); |
| 12863 | def = UINT_MAX; |
| 12864 | } |
| 12865 | } |
| 12866 | return def; |
| 12867 | } |
| 12868 | #endif |
| 12869 | |
| 12870 | #if ENABLE_HUSH_LOOPS |
| 12871 | static int FAST_FUNC builtin_break(char **argv) |
| 12872 | { |
| 12873 | unsigned depth; |
| 12874 | if (G.depth_of_loop == 0) { |
| 12875 | bb_error_msg("%s: only meaningful in a loop", argv[0]); |
| 12876 | /* if we came from builtin_continue(), need to undo "= 1" */ |
| 12877 | G.flag_break_continue = 0; |
| 12878 | return EXIT_SUCCESS; /* bash compat */ |
| 12879 | } |
| 12880 | G.flag_break_continue++; /* BC_BREAK = 1, or BC_CONTINUE = 2 */ |
| 12881 | |
| 12882 | G.depth_break_continue = depth = parse_numeric_argv1(argv, 1, 1); |
| 12883 | if (depth == UINT_MAX) |
| 12884 | G.flag_break_continue = BC_BREAK; |
| 12885 | if (G.depth_of_loop < depth) |
| 12886 | G.depth_break_continue = G.depth_of_loop; |
| 12887 | |
| 12888 | return EXIT_SUCCESS; |
| 12889 | } |
| 12890 | |
| 12891 | static int FAST_FUNC builtin_continue(char **argv) |
| 12892 | { |
| 12893 | G.flag_break_continue = 1; /* BC_CONTINUE = 2 = 1+1 */ |
| 12894 | return builtin_break(argv); |
| 12895 | } |
| 12896 | #endif |
| 12897 | |
| 12898 | #if ENABLE_HUSH_FUNCTIONS |
| 12899 | static int FAST_FUNC builtin_return(char **argv) |
| 12900 | { |
| 12901 | int rc; |
| 12902 | |
| 12903 | if (G_flag_return_in_progress != -1) { |
| 12904 | bb_error_msg("%s: not in a function or sourced script", argv[0]); |
| 12905 | return EXIT_FAILURE; /* bash compat */ |
| 12906 | } |
| 12907 | |
| 12908 | G_flag_return_in_progress = 1; |
| 12909 | |
| 12910 | /* bash: |
| 12911 | * out of range: wraps around at 256, does not error out |
| 12912 | * non-numeric param: |
| 12913 | * f() { false; return qwe; }; f; echo $? |
| 12914 | * bash: return: qwe: numeric argument required <== we do this |
| 12915 | * 255 <== we also do this |
| 12916 | */ |
| 12917 | rc = parse_numeric_argv1(argv, G.last_exitcode, 0); |
| 12918 | # if ENABLE_HUSH_TRAP |
| 12919 | if (argv[1]) { /* "return ARG" inside a running trap sets $? */ |
| 12920 | debug_printf_exec("G.return_exitcode=%d\n", rc); |
| 12921 | G.return_exitcode = rc; |
| 12922 | } |
| 12923 | # endif |
| 12924 | return rc; |
| 12925 | } |
| 12926 | #endif |
| 12927 | |
| 12928 | #if ENABLE_HUSH_TIMES |
| 12929 | static int FAST_FUNC builtin_times(char **argv UNUSED_PARAM) |
| 12930 | { |
| 12931 | static const uint8_t times_tbl[] ALIGN1 = { |
| 12932 | ' ', offsetof(struct tms, tms_utime), |
| 12933 | '\n', offsetof(struct tms, tms_stime), |
| 12934 | ' ', offsetof(struct tms, tms_cutime), |
| 12935 | '\n', offsetof(struct tms, tms_cstime), |
| 12936 | 0 |
| 12937 | }; |
| 12938 | const uint8_t *p; |
| 12939 | unsigned clk_tck; |
| 12940 | struct tms buf; |
| 12941 | |
| 12942 | clk_tck = bb_clk_tck(); |
| 12943 | |
| 12944 | times(&buf); |
| 12945 | p = times_tbl; |
| 12946 | do { |
| 12947 | unsigned sec, frac; |
| 12948 | unsigned long t; |
| 12949 | t = *(clock_t *)(((char *) &buf) + p[1]); |
| 12950 | sec = t / clk_tck; |
| 12951 | frac = t % clk_tck; |
| 12952 | printf("%um%u.%03us%c", |
| 12953 | sec / 60, sec % 60, |
| 12954 | (frac * 1000) / clk_tck, |
| 12955 | p[0]); |
| 12956 | p += 2; |
| 12957 | } while (*p); |
| 12958 | |
| 12959 | return EXIT_SUCCESS; |
| 12960 | } |
| 12961 | #endif |
| 12962 | |
| 12963 | #if ENABLE_HUSH_MEMLEAK |
| 12964 | static int FAST_FUNC builtin_memleak(char **argv UNUSED_PARAM) |
| 12965 | { |
| 12966 | void *p; |
| 12967 | unsigned long l; |
| 12968 | |
| 12969 | # ifdef M_TRIM_THRESHOLD |
| 12970 | /* Optional. Reduces probability of false positives */ |
| 12971 | malloc_trim(0); |
| 12972 | # endif |
| 12973 | /* Crude attempt to find where "free memory" starts, |
| 12974 | * sans fragmentation. */ |
| 12975 | p = malloc(240); |
| 12976 | l = (unsigned long)p; |
| 12977 | free(p); |
| 12978 | p = malloc(3400); |
| 12979 | if (l < (unsigned long)p) l = (unsigned long)p; |
| 12980 | free(p); |
| 12981 | |
Francis Laniel | b234f7e | 2023-12-22 22:02:27 +0100 | [diff] [blame] | 12982 | # if 0 /* debug */ |
| 12983 | { |
| 12984 | struct mallinfo mi = mallinfo(); |
| 12985 | printf("top alloc:0x%lx malloced:%d+%d=%d\n", l, |
| 12986 | mi.arena, mi.hblkhd, mi.arena + mi.hblkhd); |
| 12987 | } |
| 12988 | # endif |
| 12989 | |
| 12990 | if (!G.memleak_value) |
| 12991 | G.memleak_value = l; |
| 12992 | |
| 12993 | l -= G.memleak_value; |
| 12994 | if ((long)l < 0) |
| 12995 | l = 0; |
| 12996 | l /= 1024; |
| 12997 | if (l > 127) |
| 12998 | l = 127; |
| 12999 | |
| 13000 | /* Exitcode is "how many kilobytes we leaked since 1st call" */ |
| 13001 | return l; |
| 13002 | } |
| 13003 | #endif |
Francis Laniel | 8197f01 | 2023-12-22 22:02:28 +0100 | [diff] [blame] | 13004 | #endif /* !__U_BOOT__ */ |