| /** |
| * @file common.c |
| * @author Michal Vasko <mvasko@cesnet.cz> |
| * @brief common internal definitions for libyang |
| * |
| * Copyright (c) 2018 CESNET, z.s.p.o. |
| * |
| * This source code is licensed under BSD 3-Clause License (the "License"). |
| * You may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * https://opensource.org/licenses/BSD-3-Clause |
| */ |
| |
| #define _GNU_SOURCE |
| |
| #include "common.h" |
| |
| #include <assert.h> |
| #include <ctype.h> |
| #include <errno.h> |
| #include <stdarg.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <sys/mman.h> |
| #include <sys/stat.h> |
| #include <unistd.h> |
| |
| #include "compat.h" |
| #include "tree_schema_internal.h" |
| |
| void * |
| ly_realloc(void *ptr, size_t size) |
| { |
| void *new_mem; |
| |
| new_mem = realloc(ptr, size); |
| if (!new_mem) { |
| free(ptr); |
| } |
| |
| return new_mem; |
| } |
| |
| char * |
| ly_strnchr(const char *s, int c, size_t len) |
| { |
| for ( ; *s != (char)c; ++s, --len) { |
| if ((*s == '\0') || (!len)) { |
| return NULL; |
| } |
| } |
| return (char *)s; |
| } |
| |
| int |
| ly_strncmp(const char *refstr, const char *str, size_t str_len) |
| { |
| int rc = strncmp(refstr, str, str_len); |
| |
| if (!rc && (refstr[str_len] == '\0')) { |
| return 0; |
| } else { |
| return rc ? rc : 1; |
| } |
| } |
| |
| LY_ERR |
| ly_getutf8(const char **input, uint32_t *utf8_char, size_t *bytes_read) |
| { |
| uint32_t c, aux; |
| size_t len; |
| |
| if (bytes_read) { |
| (*bytes_read) = 0; |
| } |
| |
| c = (*input)[0]; |
| LY_CHECK_RET(!c, LY_EINVAL); |
| |
| if (!(c & 0x80)) { |
| /* one byte character */ |
| len = 1; |
| |
| if ((c < 0x20) && (c != 0x9) && (c != 0xa) && (c != 0xd)) { |
| return LY_EINVAL; |
| } |
| } else if ((c & 0xe0) == 0xc0) { |
| /* two bytes character */ |
| len = 2; |
| |
| aux = (*input)[1]; |
| if ((aux & 0xc0) != 0x80) { |
| return LY_EINVAL; |
| } |
| c = ((c & 0x1f) << 6) | (aux & 0x3f); |
| |
| if (c < 0x80) { |
| return LY_EINVAL; |
| } |
| } else if ((c & 0xf0) == 0xe0) { |
| /* three bytes character */ |
| len = 3; |
| |
| c &= 0x0f; |
| for (uint64_t i = 1; i <= 2; i++) { |
| aux = (*input)[i]; |
| if ((aux & 0xc0) != 0x80) { |
| return LY_EINVAL; |
| } |
| |
| c = (c << 6) | (aux & 0x3f); |
| } |
| |
| if ((c < 0x800) || ((c > 0xd7ff) && (c < 0xe000)) || (c > 0xfffd)) { |
| return LY_EINVAL; |
| } |
| } else if ((c & 0xf8) == 0xf0) { |
| /* four bytes character */ |
| len = 4; |
| |
| c &= 0x07; |
| for (uint64_t i = 1; i <= 3; i++) { |
| aux = (*input)[i]; |
| if ((aux & 0xc0) != 0x80) { |
| return LY_EINVAL; |
| } |
| |
| c = (c << 6) | (aux & 0x3f); |
| } |
| |
| if ((c < 0x1000) || (c > 0x10ffff)) { |
| return LY_EINVAL; |
| } |
| } else { |
| return LY_EINVAL; |
| } |
| |
| (*utf8_char) = c; |
| (*input) += len; |
| if (bytes_read) { |
| (*bytes_read) = len; |
| } |
| return LY_SUCCESS; |
| } |
| |
| LY_ERR |
| ly_pututf8(char *dst, uint32_t value, size_t *bytes_written) |
| { |
| if (value < 0x80) { |
| /* one byte character */ |
| if ((value < 0x20) && |
| (value != 0x09) && |
| (value != 0x0a) && |
| (value != 0x0d)) { |
| return LY_EINVAL; |
| } |
| |
| dst[0] = value; |
| (*bytes_written) = 1; |
| } else if (value < 0x800) { |
| /* two bytes character */ |
| dst[0] = 0xc0 | (value >> 6); |
| dst[1] = 0x80 | (value & 0x3f); |
| (*bytes_written) = 2; |
| } else if (value < 0xfffe) { |
| /* three bytes character */ |
| if (((value & 0xf800) == 0xd800) || |
| ((value >= 0xfdd0) && (value <= 0xfdef))) { |
| /* exclude surrogate blocks %xD800-DFFF */ |
| /* exclude noncharacters %xFDD0-FDEF */ |
| return LY_EINVAL; |
| } |
| |
| dst[0] = 0xe0 | (value >> 12); |
| dst[1] = 0x80 | ((value >> 6) & 0x3f); |
| dst[2] = 0x80 | (value & 0x3f); |
| |
| (*bytes_written) = 3; |
| } else if (value < 0x10fffe) { |
| if ((value & 0xffe) == 0xffe) { |
| /* exclude noncharacters %xFFFE-FFFF, %x1FFFE-1FFFF, %x2FFFE-2FFFF, %x3FFFE-3FFFF, %x4FFFE-4FFFF, |
| * %x5FFFE-5FFFF, %x6FFFE-6FFFF, %x7FFFE-7FFFF, %x8FFFE-8FFFF, %x9FFFE-9FFFF, %xAFFFE-AFFFF, |
| * %xBFFFE-BFFFF, %xCFFFE-CFFFF, %xDFFFE-DFFFF, %xEFFFE-EFFFF, %xFFFFE-FFFFF, %x10FFFE-10FFFF */ |
| return LY_EINVAL; |
| } |
| /* four bytes character */ |
| dst[0] = 0xf0 | (value >> 18); |
| dst[1] = 0x80 | ((value >> 12) & 0x3f); |
| dst[2] = 0x80 | ((value >> 6) & 0x3f); |
| dst[3] = 0x80 | (value & 0x3f); |
| |
| (*bytes_written) = 4; |
| } else { |
| return LY_EINVAL; |
| } |
| return LY_SUCCESS; |
| } |
| |
| /** |
| * @brief Static table of the UTF8 characters lengths according to their first byte. |
| */ |
| static const unsigned char utf8_char_length_table[] = { |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, |
| 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, |
| 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, |
| 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, |
| 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 1, 1 |
| }; |
| |
| size_t |
| ly_utf8len(const char *str, size_t bytes) |
| { |
| size_t len = 0; |
| const char *ptr = str; |
| |
| while (*ptr && (size_t)(ptr - str) < bytes) { |
| ++len; |
| ptr += utf8_char_length_table[((unsigned char)(*ptr))]; |
| } |
| return len; |
| } |
| |
| size_t |
| LY_VCODE_INSTREXP_len(const char *str) |
| { |
| size_t len = 0; |
| |
| if (!str) { |
| return len; |
| } else if (!str[0]) { |
| return 1; |
| } |
| for (len = 1; len < LY_VCODE_INSTREXP_MAXLEN && str[len]; ++len) {} |
| return len; |
| } |
| |
| LY_ERR |
| ly_mmap(struct ly_ctx *ctx, int fd, size_t *length, void **addr) |
| { |
| struct stat sb; |
| long pagesize; |
| size_t m; |
| |
| assert(length); |
| assert(addr); |
| assert(fd >= 0); |
| |
| if (fstat(fd, &sb) == -1) { |
| LOGERR(ctx, LY_ESYS, "Failed to stat the file descriptor (%s) for the mmap().", strerror(errno)); |
| return LY_ESYS; |
| } |
| if (!S_ISREG(sb.st_mode)) { |
| LOGERR(ctx, LY_EINVAL, "File to mmap() is not a regular file."); |
| return LY_ESYS; |
| } |
| if (!sb.st_size) { |
| *addr = NULL; |
| return LY_SUCCESS; |
| } |
| pagesize = sysconf(_SC_PAGESIZE); |
| |
| m = sb.st_size % pagesize; |
| if (m && (pagesize - m >= 1)) { |
| /* there will be enough space (at least 1 byte) after the file content mapping to provide zeroed NULL-termination byte */ |
| *length = sb.st_size + 1; |
| *addr = mmap(NULL, *length, PROT_READ, MAP_PRIVATE, fd, 0); |
| } else { |
| /* there will not be enough bytes after the file content mapping for the additional bytes and some of them |
| * would overflow into another page that would not be zerroed and any access into it would generate SIGBUS. |
| * Therefore we have to do the following hack with double mapping. First, the required number of bytes |
| * (including the additinal bytes) is required as anonymous and thus they will be really provided (actually more |
| * because of using whole pages) and also initialized by zeros. Then, the file is mapped to the same address |
| * where the anonymous mapping starts. */ |
| *length = sb.st_size + pagesize; |
| *addr = mmap(NULL, *length, PROT_READ, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); |
| *addr = mmap(*addr, sb.st_size, PROT_READ, MAP_PRIVATE | MAP_FIXED, fd, 0); |
| } |
| if (*addr == MAP_FAILED) { |
| LOGERR(ctx, LY_ESYS, "mmap() failed (%s).", strerror(errno)); |
| return LY_ESYS; |
| } |
| |
| return LY_SUCCESS; |
| } |
| |
| LY_ERR |
| ly_munmap(void *addr, size_t length) |
| { |
| if (munmap(addr, length)) { |
| return LY_ESYS; |
| } |
| return LY_SUCCESS; |
| } |
| |
| LY_ERR |
| ly_strcat(char **dest, const char *format, ...) |
| { |
| va_list fp; |
| char *addition = NULL; |
| size_t len; |
| |
| va_start(fp, format); |
| len = vasprintf(&addition, format, fp); |
| len += (*dest ? strlen(*dest) : 0) + 1; |
| |
| if (*dest) { |
| *dest = ly_realloc(*dest, len); |
| if (!*dest) { |
| va_end(fp); |
| return LY_EMEM; |
| } |
| *dest = strcat(*dest, addition); |
| free(addition); |
| } else { |
| *dest = addition; |
| } |
| |
| va_end(fp); |
| return LY_SUCCESS; |
| } |
| |
| LY_ERR |
| ly_parse_int(const char *val_str, size_t val_len, int64_t min, int64_t max, int base, int64_t *ret) |
| { |
| char *strptr; |
| int64_t i; |
| |
| LY_CHECK_ARG_RET(NULL, val_str, val_str[0], val_len, LY_EINVAL); |
| |
| /* convert to 64-bit integer, all the redundant characters are handled */ |
| errno = 0; |
| strptr = NULL; |
| |
| /* parse the value */ |
| i = strtoll(val_str, &strptr, base); |
| if (errno || (strptr == val_str)) { |
| return LY_EVALID; |
| } else if ((i < min) || (i > max)) { |
| return LY_EDENIED; |
| } else if (strptr && *strptr) { |
| while (isspace(*strptr)) { |
| ++strptr; |
| } |
| if (*strptr && (strptr < val_str + val_len)) { |
| return LY_EVALID; |
| } |
| } |
| |
| *ret = i; |
| return LY_SUCCESS; |
| } |
| |
| LY_ERR |
| ly_parse_uint(const char *val_str, size_t val_len, uint64_t max, int base, uint64_t *ret) |
| { |
| char *strptr; |
| uint64_t u; |
| |
| LY_CHECK_ARG_RET(NULL, val_str, val_str[0], LY_EINVAL); |
| |
| errno = 0; |
| strptr = NULL; |
| u = strtoull(val_str, &strptr, base); |
| if (errno || (strptr == val_str)) { |
| return LY_EVALID; |
| } else if ((u > max) || (u && (val_str[0] == '-'))) { |
| return LY_EDENIED; |
| } else if (strptr && *strptr) { |
| while (isspace(*strptr)) { |
| ++strptr; |
| } |
| if (*strptr && (strptr < val_str + val_len)) { |
| return LY_EVALID; |
| } |
| } |
| |
| *ret = u; |
| return LY_SUCCESS; |
| } |
| |
| /** |
| * @brief Parse an identifier. |
| * |
| * ;; An identifier MUST NOT start with (('X'|'x') ('M'|'m') ('L'|'l')) |
| * identifier = (ALPHA / "_") |
| * *(ALPHA / DIGIT / "_" / "-" / ".") |
| * |
| * @param[in,out] id Identifier to parse. When returned, it points to the first character which is not part of the identifier. |
| * @return LY_ERR value: LY_SUCCESS or LY_EINVAL in case of invalid starting character. |
| */ |
| static LY_ERR |
| lys_parse_id(const char **id) |
| { |
| assert(id && *id); |
| |
| if (!is_yangidentstartchar(**id)) { |
| return LY_EINVAL; |
| } |
| ++(*id); |
| |
| while (is_yangidentchar(**id)) { |
| ++(*id); |
| } |
| return LY_SUCCESS; |
| } |
| |
| LY_ERR |
| ly_parse_nodeid(const char **id, const char **prefix, size_t *prefix_len, const char **name, size_t *name_len) |
| { |
| assert(id && *id); |
| assert(prefix && prefix_len); |
| assert(name && name_len); |
| |
| *prefix = *id; |
| *prefix_len = 0; |
| *name = NULL; |
| *name_len = 0; |
| |
| LY_CHECK_RET(lys_parse_id(id)); |
| if (**id == ':') { |
| /* there is prefix */ |
| *prefix_len = *id - *prefix; |
| ++(*id); |
| *name = *id; |
| |
| LY_CHECK_RET(lys_parse_id(id)); |
| *name_len = *id - *name; |
| } else { |
| /* there is no prefix, so what we have as prefix now is actually the name */ |
| *name = *prefix; |
| *name_len = *id - *name; |
| *prefix = NULL; |
| } |
| |
| return LY_SUCCESS; |
| } |
| |
| LY_ERR |
| ly_parse_instance_predicate(const char **pred, size_t limit, LYD_FORMAT format, |
| const char **prefix, size_t *prefix_len, const char **id, size_t *id_len, const char **value, size_t *value_len, |
| const char **errmsg) |
| { |
| LY_ERR ret = LY_EVALID; |
| const char *in = *pred; |
| size_t offset = 1; |
| uint8_t expr = 0; /* 0 - position predicate; 1 - leaf-list-predicate; 2 - key-predicate */ |
| char quot; |
| |
| assert(in[0] == '['); |
| |
| *prefix = *id = *value = NULL; |
| *prefix_len = *id_len = *value_len = 0; |
| |
| /* leading *WSP */ |
| for ( ; isspace(in[offset]); offset++) {} |
| |
| if (isdigit(in[offset])) { |
| /* pos: "[" *WSP positive-integer-value *WSP "]" */ |
| if (in[offset] == '0') { |
| /* zero */ |
| *errmsg = "The position predicate cannot be zero."; |
| goto error; |
| } |
| |
| /* positive-integer-value */ |
| *value = &in[offset++]; |
| for ( ; isdigit(in[offset]); offset++) {} |
| *value_len = &in[offset] - *value; |
| |
| } else if (in[offset] == '.') { |
| /* leaf-list-predicate: "[" *WSP "." *WSP "=" *WSP quoted-string *WSP "]" */ |
| *id = &in[offset]; |
| *id_len = 1; |
| offset++; |
| expr = 1; |
| } else if (in[offset] == '-') { |
| /* typically negative value */ |
| *errmsg = "Invalid instance predicate format (negative position or invalid node-identifier)."; |
| goto error; |
| } else { |
| /* key-predicate: "[" *WSP node-identifier *WSP "=" *WSP quoted-string *WSP "]" */ |
| in = &in[offset]; |
| if (ly_parse_nodeid(&in, prefix, prefix_len, id, id_len)) { |
| *errmsg = "Invalid node-identifier."; |
| goto error; |
| } |
| if ((format == LYD_XML) && !(*prefix)) { |
| /* all node names MUST be qualified with explicit namespace prefix */ |
| *errmsg = "Missing prefix of a node name."; |
| goto error; |
| } |
| offset = in - *pred; |
| in = *pred; |
| expr = 2; |
| } |
| |
| if (expr) { |
| /* *WSP "=" *WSP quoted-string *WSP "]" */ |
| for ( ; isspace(in[offset]); offset++) {} |
| |
| if (in[offset] != '=') { |
| if (expr == 1) { |
| *errmsg = "Unexpected character instead of \'=\' in leaf-list-predicate."; |
| } else { /* 2 */ |
| *errmsg = "Unexpected character instead of \'=\' in key-predicate."; |
| } |
| goto error; |
| } |
| offset++; |
| for ( ; isspace(in[offset]); offset++) {} |
| |
| /* quoted-string */ |
| quot = in[offset++]; |
| if ((quot != '\'') && (quot != '\"')) { |
| *errmsg = "String value is not quoted."; |
| goto error; |
| } |
| *value = &in[offset]; |
| for ( ; offset < limit && (in[offset] != quot || (offset && in[offset - 1] == '\\')); offset++) {} |
| if (in[offset] == quot) { |
| *value_len = &in[offset] - *value; |
| offset++; |
| } else { |
| *errmsg = "Value is not terminated quoted-string."; |
| goto error; |
| } |
| } |
| |
| /* *WSP "]" */ |
| for ( ; isspace(in[offset]); offset++) {} |
| if (in[offset] != ']') { |
| if (expr == 0) { |
| *errmsg = "Predicate (pos) is not terminated by \']\' character."; |
| } else if (expr == 1) { |
| *errmsg = "Predicate (leaf-list-predicate) is not terminated by \']\' character."; |
| } else { /* 2 */ |
| *errmsg = "Predicate (key-predicate) is not terminated by \']\' character."; |
| } |
| goto error; |
| } |
| offset++; |
| |
| if (offset <= limit) { |
| *pred = &in[offset]; |
| return LY_SUCCESS; |
| } |
| |
| /* we read after the limit */ |
| *errmsg = "Predicate is incomplete."; |
| *prefix = *id = *value = NULL; |
| *prefix_len = *id_len = *value_len = 0; |
| offset = limit; |
| ret = LY_EINVAL; |
| |
| error: |
| *pred = &in[offset]; |
| return ret; |
| } |