| /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
| |
| /*** |
| This file is part of systemd. |
| |
| Copyright 2011 Lennart Poettering |
| |
| systemd is free software; you can redistribute it and/or modify it |
| under the terms of the GNU Lesser General Public License as published by |
| the Free Software Foundation; either version 2.1 of the License, or |
| (at your option) any later version. |
| |
| systemd is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public License |
| along with systemd; If not, see <http://www.gnu.org/licenses/>. |
| ***/ |
| |
| #include <sys/epoll.h> |
| #include <sys/socket.h> |
| #include <errno.h> |
| #include <sys/signalfd.h> |
| #include <unistd.h> |
| #include <fcntl.h> |
| #include <stddef.h> |
| #include <sys/ioctl.h> |
| #include <linux/sockios.h> |
| #include <sys/statvfs.h> |
| |
| #include <systemd/sd-journal.h> |
| #include <systemd/sd-login.h> |
| #include <systemd/sd-messages.h> |
| #include <systemd/sd-daemon.h> |
| |
| #include "mkdir.h" |
| #include "hashmap.h" |
| #include "journal-file.h" |
| #include "socket-util.h" |
| #include "cgroup-util.h" |
| #include "list.h" |
| #include "journal-rate-limit.h" |
| #include "journal-internal.h" |
| #include "conf-parser.h" |
| #include "journald.h" |
| #include "virt.h" |
| #include "missing.h" |
| |
| #ifdef HAVE_ACL |
| #include <sys/acl.h> |
| #include <acl/libacl.h> |
| #include "acl-util.h" |
| #endif |
| |
| #ifdef HAVE_SELINUX |
| #include <selinux/selinux.h> |
| #endif |
| |
| #define USER_JOURNALS_MAX 1024 |
| #define STDOUT_STREAMS_MAX 4096 |
| |
| #define DEFAULT_RATE_LIMIT_INTERVAL (10*USEC_PER_SEC) |
| #define DEFAULT_RATE_LIMIT_BURST 200 |
| |
| #define RECHECK_AVAILABLE_SPACE_USEC (30*USEC_PER_SEC) |
| |
| #define RECHECK_VAR_AVAILABLE_USEC (30*USEC_PER_SEC) |
| |
| #define N_IOVEC_META_FIELDS 17 |
| |
| #define ENTRY_SIZE_MAX (1024*1024*32) |
| |
| typedef enum StdoutStreamState { |
| STDOUT_STREAM_IDENTIFIER, |
| STDOUT_STREAM_PRIORITY, |
| STDOUT_STREAM_LEVEL_PREFIX, |
| STDOUT_STREAM_FORWARD_TO_SYSLOG, |
| STDOUT_STREAM_FORWARD_TO_KMSG, |
| STDOUT_STREAM_FORWARD_TO_CONSOLE, |
| STDOUT_STREAM_RUNNING |
| } StdoutStreamState; |
| |
| struct StdoutStream { |
| Server *server; |
| StdoutStreamState state; |
| |
| int fd; |
| |
| struct ucred ucred; |
| #ifdef HAVE_SELINUX |
| security_context_t security_context; |
| #endif |
| |
| char *identifier; |
| int priority; |
| bool level_prefix:1; |
| bool forward_to_syslog:1; |
| bool forward_to_kmsg:1; |
| bool forward_to_console:1; |
| |
| char buffer[LINE_MAX+1]; |
| size_t length; |
| |
| LIST_FIELDS(StdoutStream, stdout_stream); |
| }; |
| |
| static int server_flush_to_var(Server *s); |
| |
| static uint64_t available_space(Server *s) { |
| char ids[33], *p; |
| const char *f; |
| sd_id128_t machine; |
| struct statvfs ss; |
| uint64_t sum = 0, avail = 0, ss_avail = 0; |
| int r; |
| DIR *d; |
| usec_t ts; |
| JournalMetrics *m; |
| |
| ts = now(CLOCK_MONOTONIC); |
| |
| if (s->cached_available_space_timestamp + RECHECK_AVAILABLE_SPACE_USEC > ts) |
| return s->cached_available_space; |
| |
| r = sd_id128_get_machine(&machine); |
| if (r < 0) |
| return 0; |
| |
| if (s->system_journal) { |
| f = "/var/log/journal/"; |
| m = &s->system_metrics; |
| } else { |
| f = "/run/log/journal/"; |
| m = &s->runtime_metrics; |
| } |
| |
| assert(m); |
| |
| p = strappend(f, sd_id128_to_string(machine, ids)); |
| if (!p) |
| return 0; |
| |
| d = opendir(p); |
| free(p); |
| |
| if (!d) |
| return 0; |
| |
| if (fstatvfs(dirfd(d), &ss) < 0) |
| goto finish; |
| |
| for (;;) { |
| struct stat st; |
| struct dirent buf, *de; |
| |
| r = readdir_r(d, &buf, &de); |
| if (r != 0) |
| break; |
| |
| if (!de) |
| break; |
| |
| if (!endswith(de->d_name, ".journal") && |
| !endswith(de->d_name, ".journal~")) |
| continue; |
| |
| if (fstatat(dirfd(d), de->d_name, &st, AT_SYMLINK_NOFOLLOW) < 0) |
| continue; |
| |
| if (!S_ISREG(st.st_mode)) |
| continue; |
| |
| sum += (uint64_t) st.st_blocks * 512UL; |
| } |
| |
| avail = sum >= m->max_use ? 0 : m->max_use - sum; |
| |
| ss_avail = ss.f_bsize * ss.f_bavail; |
| |
| ss_avail = ss_avail < m->keep_free ? 0 : ss_avail - m->keep_free; |
| |
| if (ss_avail < avail) |
| avail = ss_avail; |
| |
| s->cached_available_space = avail; |
| s->cached_available_space_timestamp = ts; |
| |
| finish: |
| closedir(d); |
| |
| return avail; |
| } |
| |
| static void server_read_file_gid(Server *s) { |
| const char *adm = "adm"; |
| int r; |
| |
| assert(s); |
| |
| if (s->file_gid_valid) |
| return; |
| |
| r = get_group_creds(&adm, &s->file_gid); |
| if (r < 0) |
| log_warning("Failed to resolve 'adm' group: %s", strerror(-r)); |
| |
| /* if we couldn't read the gid, then it will be 0, but that's |
| * fine and we shouldn't try to resolve the group again, so |
| * let's just pretend it worked right-away. */ |
| s->file_gid_valid = true; |
| } |
| |
| static void server_fix_perms(Server *s, JournalFile *f, uid_t uid) { |
| int r; |
| #ifdef HAVE_ACL |
| acl_t acl; |
| acl_entry_t entry; |
| acl_permset_t permset; |
| #endif |
| |
| assert(f); |
| |
| server_read_file_gid(s); |
| |
| r = fchmod_and_fchown(f->fd, 0640, 0, s->file_gid); |
| if (r < 0) |
| log_warning("Failed to fix access mode/rights on %s, ignoring: %s", f->path, strerror(-r)); |
| |
| #ifdef HAVE_ACL |
| if (uid <= 0) |
| return; |
| |
| acl = acl_get_fd(f->fd); |
| if (!acl) { |
| log_warning("Failed to read ACL on %s, ignoring: %m", f->path); |
| return; |
| } |
| |
| r = acl_find_uid(acl, uid, &entry); |
| if (r <= 0) { |
| |
| if (acl_create_entry(&acl, &entry) < 0 || |
| acl_set_tag_type(entry, ACL_USER) < 0 || |
| acl_set_qualifier(entry, &uid) < 0) { |
| log_warning("Failed to patch ACL on %s, ignoring: %m", f->path); |
| goto finish; |
| } |
| } |
| |
| if (acl_get_permset(entry, &permset) < 0 || |
| acl_add_perm(permset, ACL_READ) < 0 || |
| acl_calc_mask(&acl) < 0) { |
| log_warning("Failed to patch ACL on %s, ignoring: %m", f->path); |
| goto finish; |
| } |
| |
| if (acl_set_fd(f->fd, acl) < 0) |
| log_warning("Failed to set ACL on %s, ignoring: %m", f->path); |
| |
| finish: |
| acl_free(acl); |
| #endif |
| } |
| |
| static JournalFile* find_journal(Server *s, uid_t uid) { |
| char *p; |
| int r; |
| JournalFile *f; |
| char ids[33]; |
| sd_id128_t machine; |
| |
| assert(s); |
| |
| /* We split up user logs only on /var, not on /run. If the |
| * runtime file is open, we write to it exclusively, in order |
| * to guarantee proper order as soon as we flush /run to |
| * /var and close the runtime file. */ |
| |
| if (s->runtime_journal) |
| return s->runtime_journal; |
| |
| if (uid <= 0) |
| return s->system_journal; |
| |
| r = sd_id128_get_machine(&machine); |
| if (r < 0) |
| return s->system_journal; |
| |
| f = hashmap_get(s->user_journals, UINT32_TO_PTR(uid)); |
| if (f) |
| return f; |
| |
| if (asprintf(&p, "/var/log/journal/%s/user-%lu.journal", sd_id128_to_string(machine, ids), (unsigned long) uid) < 0) |
| return s->system_journal; |
| |
| while (hashmap_size(s->user_journals) >= USER_JOURNALS_MAX) { |
| /* Too many open? Then let's close one */ |
| f = hashmap_steal_first(s->user_journals); |
| assert(f); |
| journal_file_close(f); |
| } |
| |
| r = journal_file_open_reliably(p, O_RDWR|O_CREAT, 0640, s->system_journal, &f); |
| free(p); |
| |
| if (r < 0) |
| return s->system_journal; |
| |
| server_fix_perms(s, f, uid); |
| |
| r = hashmap_put(s->user_journals, UINT32_TO_PTR(uid), f); |
| if (r < 0) { |
| journal_file_close(f); |
| return s->system_journal; |
| } |
| |
| return f; |
| } |
| |
| static void server_rotate(Server *s) { |
| JournalFile *f; |
| void *k; |
| Iterator i; |
| int r; |
| |
| log_info("Rotating..."); |
| |
| if (s->runtime_journal) { |
| r = journal_file_rotate(&s->runtime_journal); |
| if (r < 0) |
| log_error("Failed to rotate %s: %s", s->runtime_journal->path, strerror(-r)); |
| else |
| server_fix_perms(s, s->runtime_journal, 0); |
| } |
| |
| if (s->system_journal) { |
| r = journal_file_rotate(&s->system_journal); |
| if (r < 0) |
| log_error("Failed to rotate %s: %s", s->system_journal->path, strerror(-r)); |
| else |
| server_fix_perms(s, s->system_journal, 0); |
| } |
| |
| HASHMAP_FOREACH_KEY(f, k, s->user_journals, i) { |
| r = journal_file_rotate(&f); |
| if (r < 0) |
| log_error("Failed to rotate %s: %s", f->path, strerror(-r)); |
| else { |
| hashmap_replace(s->user_journals, k, f); |
| server_fix_perms(s, s->system_journal, PTR_TO_UINT32(k)); |
| } |
| } |
| } |
| |
| static void server_vacuum(Server *s) { |
| char *p; |
| char ids[33]; |
| sd_id128_t machine; |
| int r; |
| |
| log_info("Vacuuming..."); |
| |
| r = sd_id128_get_machine(&machine); |
| if (r < 0) { |
| log_error("Failed to get machine ID: %s", strerror(-r)); |
| return; |
| } |
| |
| sd_id128_to_string(machine, ids); |
| |
| if (s->system_journal) { |
| if (asprintf(&p, "/var/log/journal/%s", ids) < 0) { |
| log_error("Out of memory."); |
| return; |
| } |
| |
| r = journal_directory_vacuum(p, s->system_metrics.max_use, s->system_metrics.keep_free); |
| if (r < 0 && r != -ENOENT) |
| log_error("Failed to vacuum %s: %s", p, strerror(-r)); |
| free(p); |
| } |
| |
| |
| if (s->runtime_journal) { |
| if (asprintf(&p, "/run/log/journal/%s", ids) < 0) { |
| log_error("Out of memory."); |
| return; |
| } |
| |
| r = journal_directory_vacuum(p, s->runtime_metrics.max_use, s->runtime_metrics.keep_free); |
| if (r < 0 && r != -ENOENT) |
| log_error("Failed to vacuum %s: %s", p, strerror(-r)); |
| free(p); |
| } |
| |
| s->cached_available_space_timestamp = 0; |
| } |
| |
| static char *shortened_cgroup_path(pid_t pid) { |
| int r; |
| char *process_path, *init_path, *path; |
| |
| assert(pid > 0); |
| |
| r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, pid, &process_path); |
| if (r < 0) |
| return NULL; |
| |
| r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, 1, &init_path); |
| if (r < 0) { |
| free(process_path); |
| return NULL; |
| } |
| |
| if (endswith(init_path, "/system")) |
| init_path[strlen(init_path) - 7] = 0; |
| else if (streq(init_path, "/")) |
| init_path[0] = 0; |
| |
| if (startswith(process_path, init_path)) { |
| char *p; |
| |
| p = strdup(process_path + strlen(init_path)); |
| if (!p) { |
| free(process_path); |
| free(init_path); |
| return NULL; |
| } |
| path = p; |
| } else { |
| path = process_path; |
| process_path = NULL; |
| } |
| |
| free(process_path); |
| free(init_path); |
| |
| return path; |
| } |
| |
| static void dispatch_message_real( |
| Server *s, |
| struct iovec *iovec, unsigned n, unsigned m, |
| struct ucred *ucred, |
| struct timeval *tv, |
| const char *label, size_t label_len) { |
| |
| char *pid = NULL, *uid = NULL, *gid = NULL, |
| *source_time = NULL, *boot_id = NULL, *machine_id = NULL, |
| *comm = NULL, *cmdline = NULL, *hostname = NULL, |
| *audit_session = NULL, *audit_loginuid = NULL, |
| *exe = NULL, *cgroup = NULL, *session = NULL, |
| *owner_uid = NULL, *unit = NULL, *selinux_context = NULL; |
| |
| char idbuf[33]; |
| sd_id128_t id; |
| int r; |
| char *t; |
| uid_t loginuid = 0, realuid = 0; |
| JournalFile *f; |
| bool vacuumed = false; |
| |
| assert(s); |
| assert(iovec); |
| assert(n > 0); |
| assert(n + N_IOVEC_META_FIELDS <= m); |
| |
| if (ucred) { |
| uint32_t audit; |
| uid_t owner; |
| |
| realuid = ucred->uid; |
| |
| if (asprintf(&pid, "_PID=%lu", (unsigned long) ucred->pid) >= 0) |
| IOVEC_SET_STRING(iovec[n++], pid); |
| |
| if (asprintf(&uid, "_UID=%lu", (unsigned long) ucred->uid) >= 0) |
| IOVEC_SET_STRING(iovec[n++], uid); |
| |
| if (asprintf(&gid, "_GID=%lu", (unsigned long) ucred->gid) >= 0) |
| IOVEC_SET_STRING(iovec[n++], gid); |
| |
| r = get_process_comm(ucred->pid, &t); |
| if (r >= 0) { |
| comm = strappend("_COMM=", t); |
| free(t); |
| |
| if (comm) |
| IOVEC_SET_STRING(iovec[n++], comm); |
| } |
| |
| r = get_process_exe(ucred->pid, &t); |
| if (r >= 0) { |
| exe = strappend("_EXE=", t); |
| free(t); |
| |
| if (exe) |
| IOVEC_SET_STRING(iovec[n++], exe); |
| } |
| |
| r = get_process_cmdline(ucred->pid, LINE_MAX, false, &t); |
| if (r >= 0) { |
| cmdline = strappend("_CMDLINE=", t); |
| free(t); |
| |
| if (cmdline) |
| IOVEC_SET_STRING(iovec[n++], cmdline); |
| } |
| |
| r = audit_session_from_pid(ucred->pid, &audit); |
| if (r >= 0) |
| if (asprintf(&audit_session, "_AUDIT_SESSION=%lu", (unsigned long) audit) >= 0) |
| IOVEC_SET_STRING(iovec[n++], audit_session); |
| |
| r = audit_loginuid_from_pid(ucred->pid, &loginuid); |
| if (r >= 0) |
| if (asprintf(&audit_loginuid, "_AUDIT_LOGINUID=%lu", (unsigned long) loginuid) >= 0) |
| IOVEC_SET_STRING(iovec[n++], audit_loginuid); |
| |
| t = shortened_cgroup_path(ucred->pid); |
| if (t) { |
| cgroup = strappend("_SYSTEMD_CGROUP=", t); |
| free(t); |
| |
| if (cgroup) |
| IOVEC_SET_STRING(iovec[n++], cgroup); |
| } |
| |
| if (sd_pid_get_session(ucred->pid, &t) >= 0) { |
| session = strappend("_SYSTEMD_SESSION=", t); |
| free(t); |
| |
| if (session) |
| IOVEC_SET_STRING(iovec[n++], session); |
| } |
| |
| if (sd_pid_get_unit(ucred->pid, &t) >= 0) { |
| unit = strappend("_SYSTEMD_UNIT=", t); |
| free(t); |
| |
| if (unit) |
| IOVEC_SET_STRING(iovec[n++], unit); |
| } |
| |
| if (sd_pid_get_owner_uid(ucred->uid, &owner) >= 0) |
| if (asprintf(&owner_uid, "_SYSTEMD_OWNER_UID=%lu", (unsigned long) owner) >= 0) |
| IOVEC_SET_STRING(iovec[n++], owner_uid); |
| |
| #ifdef HAVE_SELINUX |
| if (label) { |
| selinux_context = malloc(sizeof("_SELINUX_CONTEXT=") + label_len); |
| if (selinux_context) { |
| memcpy(selinux_context, "_SELINUX_CONTEXT=", sizeof("_SELINUX_CONTEXT=")-1); |
| memcpy(selinux_context+sizeof("_SELINUX_CONTEXT=")-1, label, label_len); |
| selinux_context[sizeof("_SELINUX_CONTEXT=")-1+label_len] = 0; |
| IOVEC_SET_STRING(iovec[n++], selinux_context); |
| } |
| } else { |
| security_context_t con; |
| |
| if (getpidcon(ucred->pid, &con) >= 0) { |
| selinux_context = strappend("_SELINUX_CONTEXT=", con); |
| if (selinux_context) |
| IOVEC_SET_STRING(iovec[n++], selinux_context); |
| |
| freecon(con); |
| } |
| } |
| #endif |
| } |
| |
| if (tv) { |
| if (asprintf(&source_time, "_SOURCE_REALTIME_TIMESTAMP=%llu", |
| (unsigned long long) timeval_load(tv)) >= 0) |
| IOVEC_SET_STRING(iovec[n++], source_time); |
| } |
| |
| /* Note that strictly speaking storing the boot id here is |
| * redundant since the entry includes this in-line |
| * anyway. However, we need this indexed, too. */ |
| r = sd_id128_get_boot(&id); |
| if (r >= 0) |
| if (asprintf(&boot_id, "_BOOT_ID=%s", sd_id128_to_string(id, idbuf)) >= 0) |
| IOVEC_SET_STRING(iovec[n++], boot_id); |
| |
| r = sd_id128_get_machine(&id); |
| if (r >= 0) |
| if (asprintf(&machine_id, "_MACHINE_ID=%s", sd_id128_to_string(id, idbuf)) >= 0) |
| IOVEC_SET_STRING(iovec[n++], machine_id); |
| |
| t = gethostname_malloc(); |
| if (t) { |
| hostname = strappend("_HOSTNAME=", t); |
| free(t); |
| if (hostname) |
| IOVEC_SET_STRING(iovec[n++], hostname); |
| } |
| |
| assert(n <= m); |
| |
| server_flush_to_var(s); |
| |
| retry: |
| f = find_journal(s, realuid == 0 ? 0 : loginuid); |
| if (!f) |
| log_warning("Dropping message, as we can't find a place to store the data."); |
| else { |
| r = journal_file_append_entry(f, NULL, iovec, n, &s->seqnum, NULL, NULL); |
| |
| if ((r == -E2BIG || /* hit limit */ |
| r == -EFBIG || /* hit fs limit */ |
| r == -EDQUOT || /* quota hit */ |
| r == -ENOSPC || /* disk full */ |
| r == -EBADMSG || /* corrupted */ |
| r == -ENODATA || /* truncated */ |
| r == -EHOSTDOWN || /* other machine */ |
| r == -EPROTONOSUPPORT) && /* unsupported feature */ |
| !vacuumed) { |
| |
| if (r == -E2BIG) |
| log_info("Allocation limit reached, rotating."); |
| else |
| log_warning("Journal file corrupted, rotating."); |
| |
| server_rotate(s); |
| server_vacuum(s); |
| vacuumed = true; |
| |
| log_info("Retrying write."); |
| goto retry; |
| } |
| |
| if (r < 0) |
| log_error("Failed to write entry, ignoring: %s", strerror(-r)); |
| } |
| |
| free(pid); |
| free(uid); |
| free(gid); |
| free(comm); |
| free(exe); |
| free(cmdline); |
| free(source_time); |
| free(boot_id); |
| free(machine_id); |
| free(hostname); |
| free(audit_session); |
| free(audit_loginuid); |
| free(cgroup); |
| free(session); |
| free(owner_uid); |
| free(unit); |
| free(selinux_context); |
| } |
| |
| static void driver_message(Server *s, sd_id128_t message_id, const char *format, ...) { |
| char mid[11 + 32 + 1]; |
| char buffer[16 + LINE_MAX + 1]; |
| struct iovec iovec[N_IOVEC_META_FIELDS + 4]; |
| int n = 0; |
| va_list ap; |
| struct ucred ucred; |
| |
| assert(s); |
| assert(format); |
| |
| IOVEC_SET_STRING(iovec[n++], "PRIORITY=5"); |
| IOVEC_SET_STRING(iovec[n++], "_TRANSPORT=driver"); |
| |
| memcpy(buffer, "MESSAGE=", 8); |
| va_start(ap, format); |
| vsnprintf(buffer + 8, sizeof(buffer) - 8, format, ap); |
| va_end(ap); |
| char_array_0(buffer); |
| IOVEC_SET_STRING(iovec[n++], buffer); |
| |
| snprintf(mid, sizeof(mid), "MESSAGE_ID=" SD_ID128_FORMAT_STR, SD_ID128_FORMAT_VAL(message_id)); |
| char_array_0(mid); |
| IOVEC_SET_STRING(iovec[n++], mid); |
| |
| zero(ucred); |
| ucred.pid = getpid(); |
| ucred.uid = getuid(); |
| ucred.gid = getgid(); |
| |
| dispatch_message_real(s, iovec, n, ELEMENTSOF(iovec), &ucred, NULL, NULL, 0); |
| } |
| |
| static void dispatch_message(Server *s, |
| struct iovec *iovec, unsigned n, unsigned m, |
| struct ucred *ucred, |
| struct timeval *tv, |
| const char *label, size_t label_len, |
| int priority) { |
| int rl; |
| char *path = NULL, *c; |
| |
| assert(s); |
| assert(iovec || n == 0); |
| |
| if (n == 0) |
| return; |
| |
| if (!ucred) |
| goto finish; |
| |
| path = shortened_cgroup_path(ucred->pid); |
| if (!path) |
| goto finish; |
| |
| /* example: /user/lennart/3/foobar |
| * /system/dbus.service/foobar |
| * |
| * So let's cut of everything past the third /, since that is |
| * wher user directories start */ |
| |
| c = strchr(path, '/'); |
| if (c) { |
| c = strchr(c+1, '/'); |
| if (c) { |
| c = strchr(c+1, '/'); |
| if (c) |
| *c = 0; |
| } |
| } |
| |
| rl = journal_rate_limit_test(s->rate_limit, path, priority & LOG_PRIMASK, available_space(s)); |
| |
| if (rl == 0) { |
| free(path); |
| return; |
| } |
| |
| /* Write a suppression message if we suppressed something */ |
| if (rl > 1) |
| driver_message(s, SD_MESSAGE_JOURNAL_DROPPED, "Suppressed %u messages from %s", rl - 1, path); |
| |
| free(path); |
| |
| finish: |
| dispatch_message_real(s, iovec, n, m, ucred, tv, label, label_len); |
| } |
| |
| static void forward_syslog_iovec(Server *s, const struct iovec *iovec, unsigned n_iovec, struct ucred *ucred, struct timeval *tv) { |
| struct msghdr msghdr; |
| struct cmsghdr *cmsg; |
| union { |
| struct cmsghdr cmsghdr; |
| uint8_t buf[CMSG_SPACE(sizeof(struct ucred))]; |
| } control; |
| union sockaddr_union sa; |
| |
| assert(s); |
| assert(iovec); |
| assert(n_iovec > 0); |
| |
| zero(msghdr); |
| msghdr.msg_iov = (struct iovec*) iovec; |
| msghdr.msg_iovlen = n_iovec; |
| |
| zero(sa); |
| sa.un.sun_family = AF_UNIX; |
| strncpy(sa.un.sun_path, "/run/systemd/journal/syslog", sizeof(sa.un.sun_path)); |
| msghdr.msg_name = &sa; |
| msghdr.msg_namelen = offsetof(union sockaddr_union, un.sun_path) + strlen(sa.un.sun_path); |
| |
| if (ucred) { |
| zero(control); |
| msghdr.msg_control = &control; |
| msghdr.msg_controllen = sizeof(control); |
| |
| cmsg = CMSG_FIRSTHDR(&msghdr); |
| cmsg->cmsg_level = SOL_SOCKET; |
| cmsg->cmsg_type = SCM_CREDENTIALS; |
| cmsg->cmsg_len = CMSG_LEN(sizeof(struct ucred)); |
| memcpy(CMSG_DATA(cmsg), ucred, sizeof(struct ucred)); |
| msghdr.msg_controllen = cmsg->cmsg_len; |
| } |
| |
| /* Forward the syslog message we received via /dev/log to |
| * /run/systemd/syslog. Unfortunately we currently can't set |
| * the SO_TIMESTAMP auxiliary data, and hence we don't. */ |
| |
| if (sendmsg(s->syslog_fd, &msghdr, MSG_NOSIGNAL) >= 0) |
| return; |
| |
| /* The socket is full? I guess the syslog implementation is |
| * too slow, and we shouldn't wait for that... */ |
| if (errno == EAGAIN) |
| return; |
| |
| if (ucred && errno == ESRCH) { |
| struct ucred u; |
| |
| /* Hmm, presumably the sender process vanished |
| * by now, so let's fix it as good as we |
| * can, and retry */ |
| |
| u = *ucred; |
| u.pid = getpid(); |
| memcpy(CMSG_DATA(cmsg), &u, sizeof(struct ucred)); |
| |
| if (sendmsg(s->syslog_fd, &msghdr, MSG_NOSIGNAL) >= 0) |
| return; |
| |
| if (errno == EAGAIN) |
| return; |
| } |
| |
| log_debug("Failed to forward syslog message: %m"); |
| } |
| |
| static void forward_syslog_raw(Server *s, const char *buffer, struct ucred *ucred, struct timeval *tv) { |
| struct iovec iovec; |
| |
| assert(s); |
| assert(buffer); |
| |
| IOVEC_SET_STRING(iovec, buffer); |
| forward_syslog_iovec(s, &iovec, 1, ucred, tv); |
| } |
| |
| static void forward_syslog(Server *s, int priority, const char *identifier, const char *message, struct ucred *ucred, struct timeval *tv) { |
| struct iovec iovec[5]; |
| char header_priority[6], header_time[64], header_pid[16]; |
| int n = 0; |
| time_t t; |
| struct tm *tm; |
| char *ident_buf = NULL; |
| |
| assert(s); |
| assert(priority >= 0); |
| assert(priority <= 999); |
| assert(message); |
| |
| /* First: priority field */ |
| snprintf(header_priority, sizeof(header_priority), "<%i>", priority); |
| char_array_0(header_priority); |
| IOVEC_SET_STRING(iovec[n++], header_priority); |
| |
| /* Second: timestamp */ |
| t = tv ? tv->tv_sec : ((time_t) (now(CLOCK_REALTIME) / USEC_PER_SEC)); |
| tm = localtime(&t); |
| if (!tm) |
| return; |
| if (strftime(header_time, sizeof(header_time), "%h %e %T ", tm) <= 0) |
| return; |
| IOVEC_SET_STRING(iovec[n++], header_time); |
| |
| /* Third: identifier and PID */ |
| if (ucred) { |
| if (!identifier) { |
| get_process_comm(ucred->pid, &ident_buf); |
| identifier = ident_buf; |
| } |
| |
| snprintf(header_pid, sizeof(header_pid), "[%lu]: ", (unsigned long) ucred->pid); |
| char_array_0(header_pid); |
| |
| if (identifier) |
| IOVEC_SET_STRING(iovec[n++], identifier); |
| |
| IOVEC_SET_STRING(iovec[n++], header_pid); |
| } else if (identifier) { |
| IOVEC_SET_STRING(iovec[n++], identifier); |
| IOVEC_SET_STRING(iovec[n++], ": "); |
| } |
| |
| /* Fourth: message */ |
| IOVEC_SET_STRING(iovec[n++], message); |
| |
| forward_syslog_iovec(s, iovec, n, ucred, tv); |
| |
| free(ident_buf); |
| } |
| |
| static int fixup_priority(int priority) { |
| |
| if ((priority & LOG_FACMASK) == 0) |
| return (priority & LOG_PRIMASK) | LOG_USER; |
| |
| return priority; |
| } |
| |
| static void forward_kmsg(Server *s, int priority, const char *identifier, const char *message, struct ucred *ucred) { |
| struct iovec iovec[5]; |
| char header_priority[6], header_pid[16]; |
| int n = 0; |
| char *ident_buf = NULL; |
| int fd; |
| |
| assert(s); |
| assert(priority >= 0); |
| assert(priority <= 999); |
| assert(message); |
| |
| /* Never allow messages with kernel facility to be written to |
| * kmsg, regardless where the data comes from. */ |
| priority = fixup_priority(priority); |
| |
| /* First: priority field */ |
| snprintf(header_priority, sizeof(header_priority), "<%i>", priority); |
| char_array_0(header_priority); |
| IOVEC_SET_STRING(iovec[n++], header_priority); |
| |
| /* Second: identifier and PID */ |
| if (ucred) { |
| if (!identifier) { |
| get_process_comm(ucred->pid, &ident_buf); |
| identifier = ident_buf; |
| } |
| |
| snprintf(header_pid, sizeof(header_pid), "[%lu]: ", (unsigned long) ucred->pid); |
| char_array_0(header_pid); |
| |
| if (identifier) |
| IOVEC_SET_STRING(iovec[n++], identifier); |
| |
| IOVEC_SET_STRING(iovec[n++], header_pid); |
| } else if (identifier) { |
| IOVEC_SET_STRING(iovec[n++], identifier); |
| IOVEC_SET_STRING(iovec[n++], ": "); |
| } |
| |
| /* Fourth: message */ |
| IOVEC_SET_STRING(iovec[n++], message); |
| IOVEC_SET_STRING(iovec[n++], "\n"); |
| |
| fd = open("/dev/kmsg", O_WRONLY|O_NOCTTY|O_CLOEXEC); |
| if (fd < 0) { |
| log_debug("Failed to open /dev/kmsg for logging: %s", strerror(errno)); |
| goto finish; |
| } |
| |
| if (writev(fd, iovec, n) < 0) |
| log_debug("Failed to write to /dev/kmsg for logging: %s", strerror(errno)); |
| |
| close_nointr_nofail(fd); |
| |
| finish: |
| free(ident_buf); |
| } |
| |
| static void forward_console(Server *s, const char *identifier, const char *message, struct ucred *ucred) { |
| struct iovec iovec[4]; |
| char header_pid[16]; |
| int n = 0, fd; |
| char *ident_buf = NULL; |
| |
| assert(s); |
| assert(message); |
| |
| /* First: identifier and PID */ |
| if (ucred) { |
| if (!identifier) { |
| get_process_comm(ucred->pid, &ident_buf); |
| identifier = ident_buf; |
| } |
| |
| snprintf(header_pid, sizeof(header_pid), "[%lu]: ", (unsigned long) ucred->pid); |
| char_array_0(header_pid); |
| |
| if (identifier) |
| IOVEC_SET_STRING(iovec[n++], identifier); |
| |
| IOVEC_SET_STRING(iovec[n++], header_pid); |
| } else if (identifier) { |
| IOVEC_SET_STRING(iovec[n++], identifier); |
| IOVEC_SET_STRING(iovec[n++], ": "); |
| } |
| |
| /* Third: message */ |
| IOVEC_SET_STRING(iovec[n++], message); |
| IOVEC_SET_STRING(iovec[n++], "\n"); |
| |
| fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC); |
| if (fd < 0) { |
| log_debug("Failed to open /dev/console for logging: %s", strerror(errno)); |
| goto finish; |
| } |
| |
| if (writev(fd, iovec, n) < 0) |
| log_debug("Failed to write to /dev/console for logging: %s", strerror(errno)); |
| |
| close_nointr_nofail(fd); |
| |
| finish: |
| free(ident_buf); |
| } |
| |
| static void read_identifier(const char **buf, char **identifier, char **pid) { |
| const char *p; |
| char *t; |
| size_t l, e; |
| |
| assert(buf); |
| assert(identifier); |
| assert(pid); |
| |
| p = *buf; |
| |
| p += strspn(p, WHITESPACE); |
| l = strcspn(p, WHITESPACE); |
| |
| if (l <= 0 || |
| p[l-1] != ':') |
| return; |
| |
| e = l; |
| l--; |
| |
| if (p[l-1] == ']') { |
| size_t k = l-1; |
| |
| for (;;) { |
| |
| if (p[k] == '[') { |
| t = strndup(p+k+1, l-k-2); |
| if (t) |
| *pid = t; |
| |
| l = k; |
| break; |
| } |
| |
| if (k == 0) |
| break; |
| |
| k--; |
| } |
| } |
| |
| t = strndup(p, l); |
| if (t) |
| *identifier = t; |
| |
| *buf = p + e; |
| *buf += strspn(*buf, WHITESPACE); |
| } |
| |
| static void process_syslog_message(Server *s, const char *buf, struct ucred *ucred, struct timeval *tv, const char *label, size_t label_len) { |
| char *message = NULL, *syslog_priority = NULL, *syslog_facility = NULL, *syslog_identifier = NULL, *syslog_pid = NULL; |
| struct iovec iovec[N_IOVEC_META_FIELDS + 6]; |
| unsigned n = 0; |
| int priority = LOG_USER | LOG_INFO; |
| char *identifier = NULL, *pid = NULL; |
| |
| assert(s); |
| assert(buf); |
| |
| if (s->forward_to_syslog) |
| forward_syslog_raw(s, buf, ucred, tv); |
| |
| parse_syslog_priority((char**) &buf, &priority); |
| skip_syslog_date((char**) &buf); |
| read_identifier(&buf, &identifier, &pid); |
| |
| if (s->forward_to_kmsg) |
| forward_kmsg(s, priority, identifier, buf, ucred); |
| |
| if (s->forward_to_console) |
| forward_console(s, identifier, buf, ucred); |
| |
| IOVEC_SET_STRING(iovec[n++], "_TRANSPORT=syslog"); |
| |
| if (asprintf(&syslog_priority, "PRIORITY=%i", priority & LOG_PRIMASK) >= 0) |
| IOVEC_SET_STRING(iovec[n++], syslog_priority); |
| |
| if (priority & LOG_FACMASK) |
| if (asprintf(&syslog_facility, "SYSLOG_FACILITY=%i", LOG_FAC(priority)) >= 0) |
| IOVEC_SET_STRING(iovec[n++], syslog_facility); |
| |
| if (identifier) { |
| syslog_identifier = strappend("SYSLOG_IDENTIFIER=", identifier); |
| if (syslog_identifier) |
| IOVEC_SET_STRING(iovec[n++], syslog_identifier); |
| } |
| |
| if (pid) { |
| syslog_pid = strappend("SYSLOG_PID=", pid); |
| if (syslog_pid) |
| IOVEC_SET_STRING(iovec[n++], syslog_pid); |
| } |
| |
| message = strappend("MESSAGE=", buf); |
| if (message) |
| IOVEC_SET_STRING(iovec[n++], message); |
| |
| dispatch_message(s, iovec, n, ELEMENTSOF(iovec), ucred, tv, label, label_len, priority); |
| |
| free(message); |
| free(identifier); |
| free(pid); |
| free(syslog_priority); |
| free(syslog_facility); |
| free(syslog_identifier); |
| } |
| |
| static bool valid_user_field(const char *p, size_t l) { |
| const char *a; |
| |
| /* We kinda enforce POSIX syntax recommendations for |
| environment variables here, but make a couple of additional |
| requirements. |
| |
| http://pubs.opengroup.org/onlinepubs/000095399/basedefs/xbd_chap08.html */ |
| |
| /* No empty field names */ |
| if (l <= 0) |
| return false; |
| |
| /* Don't allow names longer than 64 chars */ |
| if (l > 64) |
| return false; |
| |
| /* Variables starting with an underscore are protected */ |
| if (p[0] == '_') |
| return false; |
| |
| /* Don't allow digits as first character */ |
| if (p[0] >= '0' && p[0] <= '9') |
| return false; |
| |
| /* Only allow A-Z0-9 and '_' */ |
| for (a = p; a < p + l; a++) |
| if (!((*a >= 'A' && *a <= 'Z') || |
| (*a >= '0' && *a <= '9') || |
| *a == '_')) |
| return false; |
| |
| return true; |
| } |
| |
| static void process_native_message( |
| Server *s, |
| const void *buffer, size_t buffer_size, |
| struct ucred *ucred, |
| struct timeval *tv, |
| const char *label, size_t label_len) { |
| |
| struct iovec *iovec = NULL; |
| unsigned n = 0, m = 0, j, tn = (unsigned) -1; |
| const char *p; |
| size_t remaining; |
| int priority = LOG_INFO; |
| char *identifier = NULL, *message = NULL; |
| |
| assert(s); |
| assert(buffer || n == 0); |
| |
| p = buffer; |
| remaining = buffer_size; |
| |
| while (remaining > 0) { |
| const char *e, *q; |
| |
| e = memchr(p, '\n', remaining); |
| |
| if (!e) { |
| /* Trailing noise, let's ignore it, and flush what we collected */ |
| log_debug("Received message with trailing noise, ignoring."); |
| break; |
| } |
| |
| if (e == p) { |
| /* Entry separator */ |
| dispatch_message(s, iovec, n, m, ucred, tv, label, label_len, priority); |
| n = 0; |
| priority = LOG_INFO; |
| |
| p++; |
| remaining--; |
| continue; |
| } |
| |
| if (*p == '.' || *p == '#') { |
| /* Ignore control commands for now, and |
| * comments too. */ |
| remaining -= (e - p) + 1; |
| p = e + 1; |
| continue; |
| } |
| |
| /* A property follows */ |
| |
| if (n+N_IOVEC_META_FIELDS >= m) { |
| struct iovec *c; |
| unsigned u; |
| |
| u = MAX((n+N_IOVEC_META_FIELDS+1) * 2U, 4U); |
| c = realloc(iovec, u * sizeof(struct iovec)); |
| if (!c) { |
| log_error("Out of memory"); |
| break; |
| } |
| |
| iovec = c; |
| m = u; |
| } |
| |
| q = memchr(p, '=', e - p); |
| if (q) { |
| if (valid_user_field(p, q - p)) { |
| size_t l; |
| |
| l = e - p; |
| |
| /* If the field name starts with an |
| * underscore, skip the variable, |
| * since that indidates a trusted |
| * field */ |
| iovec[n].iov_base = (char*) p; |
| iovec[n].iov_len = l; |
| n++; |
| |
| /* We need to determine the priority |
| * of this entry for the rate limiting |
| * logic */ |
| if (l == 10 && |
| memcmp(p, "PRIORITY=", 9) == 0 && |
| p[9] >= '0' && p[9] <= '9') |
| priority = (priority & LOG_FACMASK) | (p[9] - '0'); |
| |
| else if (l == 17 && |
| memcmp(p, "SYSLOG_FACILITY=", 16) == 0 && |
| p[16] >= '0' && p[16] <= '9') |
| priority = (priority & LOG_PRIMASK) | ((p[16] - '0') << 3); |
| |
| else if (l == 18 && |
| memcmp(p, "SYSLOG_FACILITY=", 16) == 0 && |
| p[16] >= '0' && p[16] <= '9' && |
| p[17] >= '0' && p[17] <= '9') |
| priority = (priority & LOG_PRIMASK) | (((p[16] - '0')*10 + (p[17] - '0')) << 3); |
| |
| else if (l >= 12 && |
| memcmp(p, "SYSLOG_IDENTIFIER=", 11) == 0) { |
| char *t; |
| |
| t = strndup(p + 11, l - 11); |
| if (t) { |
| free(identifier); |
| identifier = t; |
| } |
| } else if (l >= 8 && |
| memcmp(p, "MESSAGE=", 8) == 0) { |
| char *t; |
| |
| t = strndup(p + 8, l - 8); |
| if (t) { |
| free(message); |
| message = t; |
| } |
| } |
| } |
| |
| remaining -= (e - p) + 1; |
| p = e + 1; |
| continue; |
| } else { |
| le64_t l_le; |
| uint64_t l; |
| char *k; |
| |
| if (remaining < e - p + 1 + sizeof(uint64_t) + 1) { |
| log_debug("Failed to parse message, ignoring."); |
| break; |
| } |
| |
| memcpy(&l_le, e + 1, sizeof(uint64_t)); |
| l = le64toh(l_le); |
| |
| if (remaining < e - p + 1 + sizeof(uint64_t) + l + 1 || |
| e[1+sizeof(uint64_t)+l] != '\n') { |
| log_debug("Failed to parse message, ignoring."); |
| break; |
| } |
| |
| k = malloc((e - p) + 1 + l); |
| if (!k) { |
| log_error("Out of memory"); |
| break; |
| } |
| |
| memcpy(k, p, e - p); |
| k[e - p] = '='; |
| memcpy(k + (e - p) + 1, e + 1 + sizeof(uint64_t), l); |
| |
| if (valid_user_field(p, e - p)) { |
| iovec[n].iov_base = k; |
| iovec[n].iov_len = (e - p) + 1 + l; |
| n++; |
| } else |
| free(k); |
| |
| remaining -= (e - p) + 1 + sizeof(uint64_t) + l + 1; |
| p = e + 1 + sizeof(uint64_t) + l + 1; |
| } |
| } |
| |
| if (n <= 0) |
| goto finish; |
| |
| tn = n++; |
| IOVEC_SET_STRING(iovec[tn], "_TRANSPORT=journal"); |
| |
| if (message) { |
| if (s->forward_to_syslog) |
| forward_syslog(s, priority, identifier, message, ucred, tv); |
| |
| if (s->forward_to_kmsg) |
| forward_kmsg(s, priority, identifier, message, ucred); |
| |
| if (s->forward_to_console) |
| forward_console(s, identifier, message, ucred); |
| } |
| |
| dispatch_message(s, iovec, n, m, ucred, tv, label, label_len, priority); |
| |
| finish: |
| for (j = 0; j < n; j++) { |
| if (j == tn) |
| continue; |
| |
| if (iovec[j].iov_base < buffer || |
| (const uint8_t*) iovec[j].iov_base >= (const uint8_t*) buffer + buffer_size) |
| free(iovec[j].iov_base); |
| } |
| |
| free(iovec); |
| free(identifier); |
| free(message); |
| } |
| |
| static void process_native_file( |
| Server *s, |
| int fd, |
| struct ucred *ucred, |
| struct timeval *tv, |
| const char *label, size_t label_len) { |
| |
| struct stat st; |
| void *p; |
| ssize_t n; |
| |
| assert(s); |
| assert(fd >= 0); |
| |
| /* Data is in the passed file, since it didn't fit in a |
| * datagram. We can't map the file here, since clients might |
| * then truncate it and trigger a SIGBUS for us. So let's |
| * stupidly read it */ |
| |
| if (fstat(fd, &st) < 0) { |
| log_error("Failed to stat passed file, ignoring: %m"); |
| return; |
| } |
| |
| if (!S_ISREG(st.st_mode)) { |
| log_error("File passed is not regular. Ignoring."); |
| return; |
| } |
| |
| if (st.st_size <= 0) |
| return; |
| |
| if (st.st_size > ENTRY_SIZE_MAX) { |
| log_error("File passed too large. Ignoring."); |
| return; |
| } |
| |
| p = malloc(st.st_size); |
| if (!p) { |
| log_error("Out of memory"); |
| return; |
| } |
| |
| n = pread(fd, p, st.st_size, 0); |
| if (n < 0) |
| log_error("Failed to read file, ignoring: %s", strerror(-n)); |
| else if (n > 0) |
| process_native_message(s, p, n, ucred, tv, label, label_len); |
| |
| free(p); |
| } |
| |
| static int stdout_stream_log(StdoutStream *s, const char *p) { |
| struct iovec iovec[N_IOVEC_META_FIELDS + 5]; |
| char *message = NULL, *syslog_priority = NULL, *syslog_facility = NULL, *syslog_identifier = NULL; |
| unsigned n = 0; |
| int priority; |
| char *label = NULL; |
| size_t label_len = 0; |
| |
| assert(s); |
| assert(p); |
| |
| if (isempty(p)) |
| return 0; |
| |
| priority = s->priority; |
| |
| if (s->level_prefix) |
| parse_syslog_priority((char**) &p, &priority); |
| |
| if (s->forward_to_syslog || s->server->forward_to_syslog) |
| forward_syslog(s->server, fixup_priority(priority), s->identifier, p, &s->ucred, NULL); |
| |
| if (s->forward_to_kmsg || s->server->forward_to_kmsg) |
| forward_kmsg(s->server, priority, s->identifier, p, &s->ucred); |
| |
| if (s->forward_to_console || s->server->forward_to_console) |
| forward_console(s->server, s->identifier, p, &s->ucred); |
| |
| IOVEC_SET_STRING(iovec[n++], "_TRANSPORT=stdout"); |
| |
| if (asprintf(&syslog_priority, "PRIORITY=%i", priority & LOG_PRIMASK) >= 0) |
| IOVEC_SET_STRING(iovec[n++], syslog_priority); |
| |
| if (priority & LOG_FACMASK) |
| if (asprintf(&syslog_facility, "SYSLOG_FACILITY=%i", LOG_FAC(priority)) >= 0) |
| IOVEC_SET_STRING(iovec[n++], syslog_facility); |
| |
| if (s->identifier) { |
| syslog_identifier = strappend("SYSLOG_IDENTIFIER=", s->identifier); |
| if (syslog_identifier) |
| IOVEC_SET_STRING(iovec[n++], syslog_identifier); |
| } |
| |
| message = strappend("MESSAGE=", p); |
| if (message) |
| IOVEC_SET_STRING(iovec[n++], message); |
| |
| #ifdef HAVE_SELINUX |
| if (s->security_context) { |
| label = (char*) s->security_context; |
| label_len = strlen((char*) s->security_context); |
| } |
| #endif |
| |
| dispatch_message(s->server, iovec, n, ELEMENTSOF(iovec), &s->ucred, NULL, label, label_len, priority); |
| |
| free(message); |
| free(syslog_priority); |
| free(syslog_facility); |
| free(syslog_identifier); |
| |
| return 0; |
| } |
| |
| static int stdout_stream_line(StdoutStream *s, char *p) { |
| int r; |
| |
| assert(s); |
| assert(p); |
| |
| p = strstrip(p); |
| |
| switch (s->state) { |
| |
| case STDOUT_STREAM_IDENTIFIER: |
| if (isempty(p)) |
| s->identifier = NULL; |
| else { |
| s->identifier = strdup(p); |
| if (!s->identifier) { |
| log_error("Out of memory"); |
| return -ENOMEM; |
| } |
| } |
| |
| s->state = STDOUT_STREAM_PRIORITY; |
| return 0; |
| |
| case STDOUT_STREAM_PRIORITY: |
| r = safe_atoi(p, &s->priority); |
| if (r < 0 || s->priority <= 0 || s->priority >= 999) { |
| log_warning("Failed to parse log priority line."); |
| return -EINVAL; |
| } |
| |
| s->state = STDOUT_STREAM_LEVEL_PREFIX; |
| return 0; |
| |
| case STDOUT_STREAM_LEVEL_PREFIX: |
| r = parse_boolean(p); |
| if (r < 0) { |
| log_warning("Failed to parse level prefix line."); |
| return -EINVAL; |
| } |
| |
| s->level_prefix = !!r; |
| s->state = STDOUT_STREAM_FORWARD_TO_SYSLOG; |
| return 0; |
| |
| case STDOUT_STREAM_FORWARD_TO_SYSLOG: |
| r = parse_boolean(p); |
| if (r < 0) { |
| log_warning("Failed to parse forward to syslog line."); |
| return -EINVAL; |
| } |
| |
| s->forward_to_syslog = !!r; |
| s->state = STDOUT_STREAM_FORWARD_TO_KMSG; |
| return 0; |
| |
| case STDOUT_STREAM_FORWARD_TO_KMSG: |
| r = parse_boolean(p); |
| if (r < 0) { |
| log_warning("Failed to parse copy to kmsg line."); |
| return -EINVAL; |
| } |
| |
| s->forward_to_kmsg = !!r; |
| s->state = STDOUT_STREAM_FORWARD_TO_CONSOLE; |
| return 0; |
| |
| case STDOUT_STREAM_FORWARD_TO_CONSOLE: |
| r = parse_boolean(p); |
| if (r < 0) { |
| log_warning("Failed to parse copy to console line."); |
| return -EINVAL; |
| } |
| |
| s->forward_to_console = !!r; |
| s->state = STDOUT_STREAM_RUNNING; |
| return 0; |
| |
| case STDOUT_STREAM_RUNNING: |
| return stdout_stream_log(s, p); |
| } |
| |
| assert_not_reached("Unknown stream state"); |
| } |
| |
| static int stdout_stream_scan(StdoutStream *s, bool force_flush) { |
| char *p; |
| size_t remaining; |
| int r; |
| |
| assert(s); |
| |
| p = s->buffer; |
| remaining = s->length; |
| for (;;) { |
| char *end; |
| size_t skip; |
| |
| end = memchr(p, '\n', remaining); |
| if (end) |
| skip = end - p + 1; |
| else if (remaining >= sizeof(s->buffer) - 1) { |
| end = p + sizeof(s->buffer) - 1; |
| skip = remaining; |
| } else |
| break; |
| |
| *end = 0; |
| |
| r = stdout_stream_line(s, p); |
| if (r < 0) |
| return r; |
| |
| remaining -= skip; |
| p += skip; |
| } |
| |
| if (force_flush && remaining > 0) { |
| p[remaining] = 0; |
| r = stdout_stream_line(s, p); |
| if (r < 0) |
| return r; |
| |
| p += remaining; |
| remaining = 0; |
| } |
| |
| if (p > s->buffer) { |
| memmove(s->buffer, p, remaining); |
| s->length = remaining; |
| } |
| |
| return 0; |
| } |
| |
| static int stdout_stream_process(StdoutStream *s) { |
| ssize_t l; |
| int r; |
| |
| assert(s); |
| |
| l = read(s->fd, s->buffer+s->length, sizeof(s->buffer)-1-s->length); |
| if (l < 0) { |
| |
| if (errno == EAGAIN) |
| return 0; |
| |
| log_warning("Failed to read from stream: %m"); |
| return -errno; |
| } |
| |
| if (l == 0) { |
| r = stdout_stream_scan(s, true); |
| if (r < 0) |
| return r; |
| |
| return 0; |
| } |
| |
| s->length += l; |
| r = stdout_stream_scan(s, false); |
| if (r < 0) |
| return r; |
| |
| return 1; |
| |
| } |
| |
| static void stdout_stream_free(StdoutStream *s) { |
| assert(s); |
| |
| if (s->server) { |
| assert(s->server->n_stdout_streams > 0); |
| s->server->n_stdout_streams --; |
| LIST_REMOVE(StdoutStream, stdout_stream, s->server->stdout_streams, s); |
| } |
| |
| if (s->fd >= 0) { |
| if (s->server) |
| epoll_ctl(s->server->epoll_fd, EPOLL_CTL_DEL, s->fd, NULL); |
| |
| close_nointr_nofail(s->fd); |
| } |
| |
| #ifdef HAVE_SELINUX |
| if (s->security_context) |
| freecon(s->security_context); |
| #endif |
| |
| free(s->identifier); |
| free(s); |
| } |
| |
| static int stdout_stream_new(Server *s) { |
| StdoutStream *stream; |
| int fd, r; |
| socklen_t len; |
| struct epoll_event ev; |
| |
| assert(s); |
| |
| fd = accept4(s->stdout_fd, NULL, NULL, SOCK_NONBLOCK|SOCK_CLOEXEC); |
| if (fd < 0) { |
| if (errno == EAGAIN) |
| return 0; |
| |
| log_error("Failed to accept stdout connection: %m"); |
| return -errno; |
| } |
| |
| if (s->n_stdout_streams >= STDOUT_STREAMS_MAX) { |
| log_warning("Too many stdout streams, refusing connection."); |
| close_nointr_nofail(fd); |
| return 0; |
| } |
| |
| stream = new0(StdoutStream, 1); |
| if (!stream) { |
| log_error("Out of memory."); |
| close_nointr_nofail(fd); |
| return -ENOMEM; |
| } |
| |
| stream->fd = fd; |
| |
| len = sizeof(stream->ucred); |
| if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &stream->ucred, &len) < 0) { |
| log_error("Failed to determine peer credentials: %m"); |
| r = -errno; |
| goto fail; |
| } |
| |
| #ifdef HAVE_SELINUX |
| if (getpeercon(fd, &stream->security_context) < 0) |
| log_error("Failed to determine peer security context."); |
| #endif |
| |
| if (shutdown(fd, SHUT_WR) < 0) { |
| log_error("Failed to shutdown writing side of socket: %m"); |
| r = -errno; |
| goto fail; |
| } |
| |
| zero(ev); |
| ev.data.ptr = stream; |
| ev.events = EPOLLIN; |
| if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0) { |
| log_error("Failed to add stream to event loop: %m"); |
| r = -errno; |
| goto fail; |
| } |
| |
| stream->server = s; |
| LIST_PREPEND(StdoutStream, stdout_stream, s->stdout_streams, stream); |
| s->n_stdout_streams ++; |
| |
| return 0; |
| |
| fail: |
| stdout_stream_free(stream); |
| return r; |
| } |
| |
| static int parse_kernel_timestamp(char **_p, usec_t *t) { |
| usec_t r; |
| int k, i; |
| char *p; |
| |
| assert(_p); |
| assert(*_p); |
| assert(t); |
| |
| p = *_p; |
| |
| if (strlen(p) < 14 || p[0] != '[' || p[13] != ']' || p[6] != '.') |
| return 0; |
| |
| r = 0; |
| |
| for (i = 1; i <= 5; i++) { |
| r *= 10; |
| |
| if (p[i] == ' ') |
| continue; |
| |
| k = undecchar(p[i]); |
| if (k < 0) |
| return 0; |
| |
| r += k; |
| } |
| |
| for (i = 7; i <= 12; i++) { |
| r *= 10; |
| |
| k = undecchar(p[i]); |
| if (k < 0) |
| return 0; |
| |
| r += k; |
| } |
| |
| *t = r; |
| *_p += 14; |
| *_p += strspn(*_p, WHITESPACE); |
| |
| return 1; |
| } |
| |
| static void proc_kmsg_line(Server *s, const char *p) { |
| struct iovec iovec[N_IOVEC_META_FIELDS + 7]; |
| char *message = NULL, *syslog_priority = NULL, *syslog_pid = NULL, *syslog_facility = NULL, *syslog_identifier = NULL, *source_time = NULL; |
| int priority = LOG_KERN | LOG_INFO; |
| unsigned n = 0; |
| usec_t usec; |
| char *identifier = NULL, *pid = NULL; |
| |
| assert(s); |
| assert(p); |
| |
| if (isempty(p)) |
| return; |
| |
| parse_syslog_priority((char **) &p, &priority); |
| |
| if (s->forward_to_kmsg && (priority & LOG_FACMASK) != LOG_KERN) |
| return; |
| |
| if (parse_kernel_timestamp((char **) &p, &usec) > 0) { |
| if (asprintf(&source_time, "_SOURCE_MONOTONIC_TIMESTAMP=%llu", |
| (unsigned long long) usec) >= 0) |
| IOVEC_SET_STRING(iovec[n++], source_time); |
| } |
| |
| IOVEC_SET_STRING(iovec[n++], "_TRANSPORT=kernel"); |
| |
| if (asprintf(&syslog_priority, "PRIORITY=%i", priority & LOG_PRIMASK) >= 0) |
| IOVEC_SET_STRING(iovec[n++], syslog_priority); |
| |
| if ((priority & LOG_FACMASK) == LOG_KERN) { |
| |
| if (s->forward_to_syslog) |
| forward_syslog(s, priority, "kernel", p, NULL, NULL); |
| |
| IOVEC_SET_STRING(iovec[n++], "SYSLOG_IDENTIFIER=kernel"); |
| } else { |
| read_identifier(&p, &identifier, &pid); |
| |
| if (s->forward_to_syslog) |
| forward_syslog(s, priority, identifier, p, NULL, NULL); |
| |
| if (identifier) { |
| syslog_identifier = strappend("SYSLOG_IDENTIFIER=", identifier); |
| if (syslog_identifier) |
| IOVEC_SET_STRING(iovec[n++], syslog_identifier); |
| } |
| |
| if (pid) { |
| syslog_pid = strappend("SYSLOG_PID=", pid); |
| if (syslog_pid) |
| IOVEC_SET_STRING(iovec[n++], syslog_pid); |
| } |
| |
| if (asprintf(&syslog_facility, "SYSLOG_FACILITY=%i", LOG_FAC(priority)) >= 0) |
| IOVEC_SET_STRING(iovec[n++], syslog_facility); |
| } |
| |
| message = strappend("MESSAGE=", p); |
| if (message) |
| IOVEC_SET_STRING(iovec[n++], message); |
| |
| dispatch_message(s, iovec, n, ELEMENTSOF(iovec), NULL, NULL, NULL, 0, priority); |
| |
| free(message); |
| free(syslog_priority); |
| free(syslog_identifier); |
| free(syslog_pid); |
| free(syslog_facility); |
| free(source_time); |
| free(identifier); |
| free(pid); |
| } |
| |
| static void proc_kmsg_scan(Server *s) { |
| char *p; |
| size_t remaining; |
| |
| assert(s); |
| |
| p = s->proc_kmsg_buffer; |
| remaining = s->proc_kmsg_length; |
| for (;;) { |
| char *end; |
| size_t skip; |
| |
| end = memchr(p, '\n', remaining); |
| if (end) |
| skip = end - p + 1; |
| else if (remaining >= sizeof(s->proc_kmsg_buffer) - 1) { |
| end = p + sizeof(s->proc_kmsg_buffer) - 1; |
| skip = remaining; |
| } else |
| break; |
| |
| *end = 0; |
| |
| proc_kmsg_line(s, p); |
| |
| remaining -= skip; |
| p += skip; |
| } |
| |
| if (p > s->proc_kmsg_buffer) { |
| memmove(s->proc_kmsg_buffer, p, remaining); |
| s->proc_kmsg_length = remaining; |
| } |
| } |
| |
| static int system_journal_open(Server *s) { |
| int r; |
| char *fn; |
| sd_id128_t machine; |
| char ids[33]; |
| |
| r = sd_id128_get_machine(&machine); |
| if (r < 0) |
| return r; |
| |
| sd_id128_to_string(machine, ids); |
| |
| if (!s->system_journal) { |
| |
| /* First try to create the machine path, but not the prefix */ |
| fn = strappend("/var/log/journal/", ids); |
| if (!fn) |
| return -ENOMEM; |
| (void) mkdir(fn, 0755); |
| free(fn); |
| |
| /* The create the system journal file */ |
| fn = join("/var/log/journal/", ids, "/system.journal", NULL); |
| if (!fn) |
| return -ENOMEM; |
| |
| r = journal_file_open_reliably(fn, O_RDWR|O_CREAT, 0640, NULL, &s->system_journal); |
| free(fn); |
| |
| if (r >= 0) { |
| journal_default_metrics(&s->system_metrics, s->system_journal->fd); |
| |
| s->system_journal->metrics = s->system_metrics; |
| s->system_journal->compress = s->compress; |
| |
| server_fix_perms(s, s->system_journal, 0); |
| } else if (r < 0) { |
| |
| if (r != -ENOENT && r != -EROFS) |
| log_warning("Failed to open system journal: %s", strerror(-r)); |
| |
| r = 0; |
| } |
| } |
| |
| if (!s->runtime_journal) { |
| |
| fn = join("/run/log/journal/", ids, "/system.journal", NULL); |
| if (!fn) |
| return -ENOMEM; |
| |
| if (s->system_journal) { |
| |
| /* Try to open the runtime journal, but only |
| * if it already exists, so that we can flush |
| * it into the system journal */ |
| |
| r = journal_file_open(fn, O_RDWR, 0640, NULL, &s->runtime_journal); |
| free(fn); |
| |
| if (r < 0) { |
| if (r != -ENOENT) |
| log_warning("Failed to open runtime journal: %s", strerror(-r)); |
| |
| r = 0; |
| } |
| |
| } else { |
| |
| /* OK, we really need the runtime journal, so create |
| * it if necessary. */ |
| |
| (void) mkdir_parents(fn, 0755); |
| r = journal_file_open_reliably(fn, O_RDWR|O_CREAT, 0640, NULL, &s->runtime_journal); |
| free(fn); |
| |
| if (r < 0) { |
| log_error("Failed to open runtime journal: %s", strerror(-r)); |
| return r; |
| } |
| } |
| |
| if (s->runtime_journal) { |
| journal_default_metrics(&s->runtime_metrics, s->runtime_journal->fd); |
| |
| s->runtime_journal->metrics = s->runtime_metrics; |
| s->runtime_journal->compress = s->compress; |
| |
| server_fix_perms(s, s->runtime_journal, 0); |
| } |
| } |
| |
| return r; |
| } |
| |
| static int server_flush_to_var(Server *s) { |
| char path[] = "/run/log/journal/xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"; |
| Object *o = NULL; |
| int r; |
| sd_id128_t machine; |
| sd_journal *j; |
| usec_t ts; |
| |
| assert(s); |
| |
| if (!s->runtime_journal) |
| return 0; |
| |
| ts = now(CLOCK_MONOTONIC); |
| if (s->var_available_timestamp + RECHECK_VAR_AVAILABLE_USEC > ts) |
| return 0; |
| |
| s->var_available_timestamp = ts; |
| |
| system_journal_open(s); |
| |
| if (!s->system_journal) |
| return 0; |
| |
| log_info("Flushing to /var..."); |
| |
| r = sd_id128_get_machine(&machine); |
| if (r < 0) { |
| log_error("Failed to get machine id: %s", strerror(-r)); |
| return r; |
| } |
| |
| r = sd_journal_open(&j, SD_JOURNAL_RUNTIME_ONLY); |
| if (r < 0) { |
| log_error("Failed to read runtime journal: %s", strerror(-r)); |
| return r; |
| } |
| |
| SD_JOURNAL_FOREACH(j) { |
| JournalFile *f; |
| |
| f = j->current_file; |
| assert(f && f->current_offset > 0); |
| |
| r = journal_file_move_to_object(f, OBJECT_ENTRY, f->current_offset, &o); |
| if (r < 0) { |
| log_error("Can't read entry: %s", strerror(-r)); |
| goto finish; |
| } |
| |
| r = journal_file_copy_entry(f, s->system_journal, o, f->current_offset, NULL, NULL, NULL); |
| if (r == -E2BIG) { |
| log_info("Allocation limit reached."); |
| |
| journal_file_post_change(s->system_journal); |
| server_rotate(s); |
| server_vacuum(s); |
| |
| r = journal_file_copy_entry(f, s->system_journal, o, f->current_offset, NULL, NULL, NULL); |
| } |
| |
| if (r < 0) { |
| log_error("Can't write entry: %s", strerror(-r)); |
| goto finish; |
| } |
| } |
| |
| finish: |
| journal_file_post_change(s->system_journal); |
| |
| journal_file_close(s->runtime_journal); |
| s->runtime_journal = NULL; |
| |
| if (r >= 0) { |
| sd_id128_to_string(machine, path + 17); |
| rm_rf(path, false, true, false); |
| } |
| |
| return r; |
| } |
| |
| static int server_read_proc_kmsg(Server *s) { |
| ssize_t l; |
| assert(s); |
| assert(s->proc_kmsg_fd >= 0); |
| |
| l = read(s->proc_kmsg_fd, s->proc_kmsg_buffer + s->proc_kmsg_length, sizeof(s->proc_kmsg_buffer) - 1 - s->proc_kmsg_length); |
| if (l < 0) { |
| |
| if (errno == EAGAIN || errno == EINTR) |
| return 0; |
| |
| log_error("Failed to read from kernel: %m"); |
| return -errno; |
| } |
| |
| s->proc_kmsg_length += l; |
| |
| proc_kmsg_scan(s); |
| return 1; |
| } |
| |
| static int server_flush_proc_kmsg(Server *s) { |
| int r; |
| |
| assert(s); |
| |
| if (s->proc_kmsg_fd < 0) |
| return 0; |
| |
| log_info("Flushing /proc/kmsg..."); |
| |
| for (;;) { |
| r = server_read_proc_kmsg(s); |
| if (r < 0) |
| return r; |
| |
| if (r == 0) |
| break; |
| } |
| |
| return 0; |
| } |
| |
| static int process_event(Server *s, struct epoll_event *ev) { |
| assert(s); |
| |
| if (ev->data.fd == s->signal_fd) { |
| struct signalfd_siginfo sfsi; |
| ssize_t n; |
| |
| if (ev->events != EPOLLIN) { |
| log_info("Got invalid event from epoll."); |
| return -EIO; |
| } |
| |
| n = read(s->signal_fd, &sfsi, sizeof(sfsi)); |
| if (n != sizeof(sfsi)) { |
| |
| if (n >= 0) |
| return -EIO; |
| |
| if (errno == EINTR || errno == EAGAIN) |
| return 1; |
| |
| return -errno; |
| } |
| |
| if (sfsi.ssi_signo == SIGUSR1) { |
| server_flush_to_var(s); |
| return 0; |
| } |
| |
| log_debug("Received SIG%s", signal_to_string(sfsi.ssi_signo)); |
| return 0; |
| |
| } else if (ev->data.fd == s->proc_kmsg_fd) { |
| int r; |
| |
| if (ev->events != EPOLLIN) { |
| log_info("Got invalid event from epoll."); |
| return -EIO; |
| } |
| |
| r = server_read_proc_kmsg(s); |
| if (r < 0) |
| return r; |
| |
| return 1; |
| |
| } else if (ev->data.fd == s->native_fd || |
| ev->data.fd == s->syslog_fd) { |
| |
| if (ev->events != EPOLLIN) { |
| log_info("Got invalid event from epoll."); |
| return -EIO; |
| } |
| |
| for (;;) { |
| struct msghdr msghdr; |
| struct iovec iovec; |
| struct ucred *ucred = NULL; |
| struct timeval *tv = NULL; |
| struct cmsghdr *cmsg; |
| char *label = NULL; |
| size_t label_len = 0; |
| union { |
| struct cmsghdr cmsghdr; |
| |
| /* We use NAME_MAX space for the |
| * SELinux label here. The kernel |
| * currently enforces no limit, but |
| * according to suggestions from the |
| * SELinux people this will change and |
| * it will probably be identical to |
| * NAME_MAX. For now we use that, but |
| * this should be updated one day when |
| * the final limit is known.*/ |
| uint8_t buf[CMSG_SPACE(sizeof(struct ucred)) + |
| CMSG_SPACE(sizeof(struct timeval)) + |
| CMSG_SPACE(sizeof(int)) + /* fd */ |
| CMSG_SPACE(NAME_MAX)]; /* selinux label */ |
| } control; |
| ssize_t n; |
| int v; |
| int *fds = NULL; |
| unsigned n_fds = 0; |
| |
| if (ioctl(ev->data.fd, SIOCINQ, &v) < 0) { |
| log_error("SIOCINQ failed: %m"); |
| return -errno; |
| } |
| |
| if (s->buffer_size < (size_t) v) { |
| void *b; |
| size_t l; |
| |
| l = MAX(LINE_MAX + (size_t) v, s->buffer_size * 2); |
| b = realloc(s->buffer, l+1); |
| |
| if (!b) { |
| log_error("Couldn't increase buffer."); |
| return -ENOMEM; |
| } |
| |
| s->buffer_size = l; |
| s->buffer = b; |
| } |
| |
| zero(iovec); |
| iovec.iov_base = s->buffer; |
| iovec.iov_len = s->buffer_size; |
| |
| zero(control); |
| zero(msghdr); |
| msghdr.msg_iov = &iovec; |
| msghdr.msg_iovlen = 1; |
| msghdr.msg_control = &control; |
| msghdr.msg_controllen = sizeof(control); |
| |
| n = recvmsg(ev->data.fd, &msghdr, MSG_DONTWAIT|MSG_CMSG_CLOEXEC); |
| if (n < 0) { |
| |
| if (errno == EINTR || errno == EAGAIN) |
| return 1; |
| |
| log_error("recvmsg() failed: %m"); |
| return -errno; |
| } |
| |
| for (cmsg = CMSG_FIRSTHDR(&msghdr); cmsg; cmsg = CMSG_NXTHDR(&msghdr, cmsg)) { |
| |
| if (cmsg->cmsg_level == SOL_SOCKET && |
| cmsg->cmsg_type == SCM_CREDENTIALS && |
| cmsg->cmsg_len == CMSG_LEN(sizeof(struct ucred))) |
| ucred = (struct ucred*) CMSG_DATA(cmsg); |
| else if (cmsg->cmsg_level == SOL_SOCKET && |
| cmsg->cmsg_type == SCM_SECURITY) { |
| label = (char*) CMSG_DATA(cmsg); |
| label_len = cmsg->cmsg_len - CMSG_LEN(0); |
| } else if (cmsg->cmsg_level == SOL_SOCKET && |
| cmsg->cmsg_type == SO_TIMESTAMP && |
| cmsg->cmsg_len == CMSG_LEN(sizeof(struct timeval))) |
| tv = (struct timeval*) CMSG_DATA(cmsg); |
| else if (cmsg->cmsg_level == SOL_SOCKET && |
| cmsg->cmsg_type == SCM_RIGHTS) { |
| fds = (int*) CMSG_DATA(cmsg); |
| n_fds = (cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int); |
| } |
| } |
| |
| if (ev->data.fd == s->syslog_fd) { |
| char *e; |
| |
| if (n > 0 && n_fds == 0) { |
| e = memchr(s->buffer, '\n', n); |
| if (e) |
| *e = 0; |
| else |
| s->buffer[n] = 0; |
| |
| process_syslog_message(s, strstrip(s->buffer), ucred, tv, label, label_len); |
| } else if (n_fds > 0) |
| log_warning("Got file descriptors via syslog socket. Ignoring."); |
| |
| } else { |
| if (n > 0 && n_fds == 0) |
| process_native_message(s, s->buffer, n, ucred, tv, label, label_len); |
| else if (n == 0 && n_fds == 1) |
| process_native_file(s, fds[0], ucred, tv, label, label_len); |
| else if (n_fds > 0) |
| log_warning("Got too many file descriptors via native socket. Ignoring."); |
| } |
| |
| close_many(fds, n_fds); |
| } |
| |
| return 1; |
| |
| } else if (ev->data.fd == s->stdout_fd) { |
| |
| if (ev->events != EPOLLIN) { |
| log_info("Got invalid event from epoll."); |
| return -EIO; |
| } |
| |
| stdout_stream_new(s); |
| return 1; |
| |
| } else { |
| StdoutStream *stream; |
| |
| if ((ev->events|EPOLLIN|EPOLLHUP) != (EPOLLIN|EPOLLHUP)) { |
| log_info("Got invalid event from epoll."); |
| return -EIO; |
| } |
| |
| /* If it is none of the well-known fds, it must be an |
| * stdout stream fd. Note that this is a bit ugly here |
| * (since we rely that none of the well-known fds |
| * could be interpreted as pointer), but nonetheless |
| * safe, since the well-known fds would never get an |
| * fd > 4096, i.e. beyond the first memory page */ |
| |
| stream = ev->data.ptr; |
| |
| if (stdout_stream_process(stream) <= 0) |
| stdout_stream_free(stream); |
| |
| return 1; |
| } |
| |
| log_error("Unknown event."); |
| return 0; |
| } |
| |
| static int open_syslog_socket(Server *s) { |
| union sockaddr_union sa; |
| int one, r; |
| struct epoll_event ev; |
| |
| assert(s); |
| |
| if (s->syslog_fd < 0) { |
| |
| s->syslog_fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); |
| if (s->syslog_fd < 0) { |
| log_error("socket() failed: %m"); |
| return -errno; |
| } |
| |
| zero(sa); |
| sa.un.sun_family = AF_UNIX; |
| strncpy(sa.un.sun_path, "/dev/log", sizeof(sa.un.sun_path)); |
| |
| unlink(sa.un.sun_path); |
| |
| r = bind(s->syslog_fd, &sa.sa, offsetof(union sockaddr_union, un.sun_path) + strlen(sa.un.sun_path)); |
| if (r < 0) { |
| log_error("bind() failed: %m"); |
| return -errno; |
| } |
| |
| chmod(sa.un.sun_path, 0666); |
| } else |
| fd_nonblock(s->syslog_fd, 1); |
| |
| one = 1; |
| r = setsockopt(s->syslog_fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)); |
| if (r < 0) { |
| log_error("SO_PASSCRED failed: %m"); |
| return -errno; |
| } |
| |
| #ifdef HAVE_SELINUX |
| one = 1; |
| r = setsockopt(s->syslog_fd, SOL_SOCKET, SO_PASSSEC, &one, sizeof(one)); |
| if (r < 0) |
| log_warning("SO_PASSSEC failed: %m"); |
| #endif |
| |
| one = 1; |
| r = setsockopt(s->syslog_fd, SOL_SOCKET, SO_TIMESTAMP, &one, sizeof(one)); |
| if (r < 0) { |
| log_error("SO_TIMESTAMP failed: %m"); |
| return -errno; |
| } |
| |
| zero(ev); |
| ev.events = EPOLLIN; |
| ev.data.fd = s->syslog_fd; |
| if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->syslog_fd, &ev) < 0) { |
| log_error("Failed to add syslog server fd to epoll object: %m"); |
| return -errno; |
| } |
| |
| return 0; |
| } |
| |
| static int open_native_socket(Server*s) { |
| union sockaddr_union sa; |
| int one, r; |
| struct epoll_event ev; |
| |
| assert(s); |
| |
| if (s->native_fd < 0) { |
| |
| s->native_fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); |
| if (s->native_fd < 0) { |
| log_error("socket() failed: %m"); |
| return -errno; |
| } |
| |
| zero(sa); |
| sa.un.sun_family = AF_UNIX; |
| strncpy(sa.un.sun_path, "/run/systemd/journal/socket", sizeof(sa.un.sun_path)); |
| |
| unlink(sa.un.sun_path); |
| |
| r = bind(s->native_fd, &sa.sa, offsetof(union sockaddr_union, un.sun_path) + strlen(sa.un.sun_path)); |
| if (r < 0) { |
| log_error("bind() failed: %m"); |
| return -errno; |
| } |
| |
| chmod(sa.un.sun_path, 0666); |
| } else |
| fd_nonblock(s->native_fd, 1); |
| |
| one = 1; |
| r = setsockopt(s->native_fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)); |
| if (r < 0) { |
| log_error("SO_PASSCRED failed: %m"); |
| return -errno; |
| } |
| |
| #ifdef HAVE_SELINUX |
| one = 1; |
| r = setsockopt(s->syslog_fd, SOL_SOCKET, SO_PASSSEC, &one, sizeof(one)); |
| if (r < 0) |
| log_warning("SO_PASSSEC failed: %m"); |
| #endif |
| |
| one = 1; |
| r = setsockopt(s->native_fd, SOL_SOCKET, SO_TIMESTAMP, &one, sizeof(one)); |
| if (r < 0) { |
| log_error("SO_TIMESTAMP failed: %m"); |
| return -errno; |
| } |
| |
| zero(ev); |
| ev.events = EPOLLIN; |
| ev.data.fd = s->native_fd; |
| if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->native_fd, &ev) < 0) { |
| log_error("Failed to add native server fd to epoll object: %m"); |
| return -errno; |
| } |
| |
| return 0; |
| } |
| |
| static int open_stdout_socket(Server *s) { |
| union sockaddr_union sa; |
| int r; |
| struct epoll_event ev; |
| |
| assert(s); |
| |
| if (s->stdout_fd < 0) { |
| |
| s->stdout_fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); |
| if (s->stdout_fd < 0) { |
| log_error("socket() failed: %m"); |
| return -errno; |
| } |
| |
| zero(sa); |
| sa.un.sun_family = AF_UNIX; |
| strncpy(sa.un.sun_path, "/run/systemd/journal/stdout", sizeof(sa.un.sun_path)); |
| |
| unlink(sa.un.sun_path); |
| |
| r = bind(s->stdout_fd, &sa.sa, offsetof(union sockaddr_union, un.sun_path) + strlen(sa.un.sun_path)); |
| if (r < 0) { |
| log_error("bind() failed: %m"); |
| return -errno; |
| } |
| |
| chmod(sa.un.sun_path, 0666); |
| |
| if (listen(s->stdout_fd, SOMAXCONN) < 0) { |
| log_error("liste() failed: %m"); |
| return -errno; |
| } |
| } else |
| fd_nonblock(s->stdout_fd, 1); |
| |
| zero(ev); |
| ev.events = EPOLLIN; |
| ev.data.fd = s->stdout_fd; |
| if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->stdout_fd, &ev) < 0) { |
| log_error("Failed to add stdout server fd to epoll object: %m"); |
| return -errno; |
| } |
| |
| return 0; |
| } |
| |
| static int open_proc_kmsg(Server *s) { |
| struct epoll_event ev; |
| |
| assert(s); |
| |
| if (!s->import_proc_kmsg) |
| return 0; |
| |
| |
| s->proc_kmsg_fd = open("/proc/kmsg", O_CLOEXEC|O_NONBLOCK|O_NOCTTY); |
| if (s->proc_kmsg_fd < 0) { |
| log_warning("Failed to open /proc/kmsg, ignoring: %m"); |
| return 0; |
| } |
| |
| zero(ev); |
| ev.events = EPOLLIN; |
| ev.data.fd = s->proc_kmsg_fd; |
| if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->proc_kmsg_fd, &ev) < 0) { |
| log_error("Failed to add /proc/kmsg fd to epoll object: %m"); |
| return -errno; |
| } |
| |
| return 0; |
| } |
| |
| static int open_signalfd(Server *s) { |
| sigset_t mask; |
| struct epoll_event ev; |
| |
| assert(s); |
| |
| assert_se(sigemptyset(&mask) == 0); |
| sigset_add_many(&mask, SIGINT, SIGTERM, SIGUSR1, -1); |
| assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0); |
| |
| s->signal_fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC); |
| if (s->signal_fd < 0) { |
| log_error("signalfd(): %m"); |
| return -errno; |
| } |
| |
| zero(ev); |
| ev.events = EPOLLIN; |
| ev.data.fd = s->signal_fd; |
| |
| if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->signal_fd, &ev) < 0) { |
| log_error("epoll_ctl(): %m"); |
| return -errno; |
| } |
| |
| return 0; |
| } |
| |
| static int server_parse_proc_cmdline(Server *s) { |
| char *line, *w, *state; |
| int r; |
| size_t l; |
| |
| if (detect_container(NULL) > 0) |
| return 0; |
| |
| r = read_one_line_file("/proc/cmdline", &line); |
| if (r < 0) { |
| log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r)); |
| return 0; |
| } |
| |
| FOREACH_WORD_QUOTED(w, l, line, state) { |
| char *word; |
| |
| word = strndup(w, l); |
| if (!word) { |
| r = -ENOMEM; |
| goto finish; |
| } |
| |
| if (startswith(word, "systemd_journald.forward_to_syslog=")) { |
| r = parse_boolean(word + 35); |
| if (r < 0) |
| log_warning("Failed to parse forward to syslog switch %s. Ignoring.", word + 35); |
| else |
| s->forward_to_syslog = r; |
| } else if (startswith(word, "systemd_journald.forward_to_kmsg=")) { |
| r = parse_boolean(word + 33); |
| if (r < 0) |
| log_warning("Failed to parse forward to kmsg switch %s. Ignoring.", word + 33); |
| else |
| s->forward_to_kmsg = r; |
| } else if (startswith(word, "systemd_journald.forward_to_console=")) { |
| r = parse_boolean(word + 36); |
| if (r < 0) |
| log_warning("Failed to parse forward to console switch %s. Ignoring.", word + 36); |
| else |
| s->forward_to_console = r; |
| } |
| |
| free(word); |
| } |
| |
| r = 0; |
| |
| finish: |
| free(line); |
| return r; |
| } |
| |
| static int server_parse_config_file(Server *s) { |
| FILE *f; |
| const char *fn; |
| int r; |
| |
| assert(s); |
| |
| fn = "/etc/systemd/journald.conf"; |
| f = fopen(fn, "re"); |
| if (!f) { |
| if (errno == ENOENT) |
| return 0; |
| |
| log_warning("Failed to open configuration file %s: %m", fn); |
| return -errno; |
| } |
| |
| r = config_parse(fn, f, "Journal\0", config_item_perf_lookup, (void*) journald_gperf_lookup, false, s); |
| if (r < 0) |
| log_warning("Failed to parse configuration file: %s", strerror(-r)); |
| |
| fclose(f); |
| |
| return r; |
| } |
| |
| static int server_init(Server *s) { |
| int n, r, fd; |
| |
| assert(s); |
| |
| zero(*s); |
| s->syslog_fd = s->native_fd = s->stdout_fd = s->signal_fd = s->epoll_fd = s->proc_kmsg_fd = -1; |
| s->compress = true; |
| |
| s->rate_limit_interval = DEFAULT_RATE_LIMIT_INTERVAL; |
| s->rate_limit_burst = DEFAULT_RATE_LIMIT_BURST; |
| |
| s->forward_to_syslog = true; |
| s->import_proc_kmsg = true; |
| |
| memset(&s->system_metrics, 0xFF, sizeof(s->system_metrics)); |
| memset(&s->runtime_metrics, 0xFF, sizeof(s->runtime_metrics)); |
| |
| server_parse_config_file(s); |
| server_parse_proc_cmdline(s); |
| |
| s->user_journals = hashmap_new(trivial_hash_func, trivial_compare_func); |
| if (!s->user_journals) { |
| log_error("Out of memory."); |
| return -ENOMEM; |
| } |
| |
| s->epoll_fd = epoll_create1(EPOLL_CLOEXEC); |
| if (s->epoll_fd < 0) { |
| log_error("Failed to create epoll object: %m"); |
| return -errno; |
| } |
| |
| n = sd_listen_fds(true); |
| if (n < 0) { |
| log_error("Failed to read listening file descriptors from environment: %s", strerror(-n)); |
| return n; |
| } |
| |
| for (fd = SD_LISTEN_FDS_START; fd < SD_LISTEN_FDS_START + n; fd++) { |
| |
| if (sd_is_socket_unix(fd, SOCK_DGRAM, -1, "/run/systemd/journal/socket", 0) > 0) { |
| |
| if (s->native_fd >= 0) { |
| log_error("Too many native sockets passed."); |
| return -EINVAL; |
| } |
| |
| s->native_fd = fd; |
| |
| } else if (sd_is_socket_unix(fd, SOCK_STREAM, 1, "/run/systemd/journal/stdout", 0) > 0) { |
| |
| if (s->stdout_fd >= 0) { |
| log_error("Too many stdout sockets passed."); |
| return -EINVAL; |
| } |
| |
| s->stdout_fd = fd; |
| |
| } else if (sd_is_socket_unix(fd, SOCK_DGRAM, -1, "/dev/log", 0) > 0) { |
| |
| if (s->syslog_fd >= 0) { |
| log_error("Too many /dev/log sockets passed."); |
| return -EINVAL; |
| } |
| |
| s->syslog_fd = fd; |
| |
| } else { |
| log_error("Unknown socket passed."); |
| return -EINVAL; |
| } |
| } |
| |
| r = open_syslog_socket(s); |
| if (r < 0) |
| return r; |
| |
| r = open_native_socket(s); |
| if (r < 0) |
| return r; |
| |
| r = open_stdout_socket(s); |
| if (r < 0) |
| return r; |
| |
| r = open_proc_kmsg(s); |
| if (r < 0) |
| return r; |
| |
| r = open_signalfd(s); |
| if (r < 0) |
| return r; |
| |
| s->rate_limit = journal_rate_limit_new(s->rate_limit_interval, s->rate_limit_burst); |
| if (!s->rate_limit) |
| return -ENOMEM; |
| |
| r = system_journal_open(s); |
| if (r < 0) |
| return r; |
| |
| return 0; |
| } |
| |
| static void server_done(Server *s) { |
| JournalFile *f; |
| assert(s); |
| |
| while (s->stdout_streams) |
| stdout_stream_free(s->stdout_streams); |
| |
| if (s->system_journal) |
| journal_file_close(s->system_journal); |
| |
| if (s->runtime_journal) |
| journal_file_close(s->runtime_journal); |
| |
| while ((f = hashmap_steal_first(s->user_journals))) |
| journal_file_close(f); |
| |
| hashmap_free(s->user_journals); |
| |
| if (s->epoll_fd >= 0) |
| close_nointr_nofail(s->epoll_fd); |
| |
| if (s->signal_fd >= 0) |
| close_nointr_nofail(s->signal_fd); |
| |
| if (s->syslog_fd >= 0) |
| close_nointr_nofail(s->syslog_fd); |
| |
| if (s->native_fd >= 0) |
| close_nointr_nofail(s->native_fd); |
| |
| if (s->stdout_fd >= 0) |
| close_nointr_nofail(s->stdout_fd); |
| |
| if (s->proc_kmsg_fd >= 0) |
| close_nointr_nofail(s->proc_kmsg_fd); |
| |
| if (s->rate_limit) |
| journal_rate_limit_free(s->rate_limit); |
| |
| free(s->buffer); |
| } |
| |
| int main(int argc, char *argv[]) { |
| Server server; |
| int r; |
| |
| /* if (getppid() != 1) { */ |
| /* log_error("This program should be invoked by init only."); */ |
| /* return EXIT_FAILURE; */ |
| /* } */ |
| |
| if (argc > 1) { |
| log_error("This program does not take arguments."); |
| return EXIT_FAILURE; |
| } |
| |
| log_set_target(LOG_TARGET_CONSOLE); |
| log_set_facility(LOG_SYSLOG); |
| log_parse_environment(); |
| log_open(); |
| |
| umask(0022); |
| |
| r = server_init(&server); |
| if (r < 0) |
| goto finish; |
| |
| server_vacuum(&server); |
| server_flush_to_var(&server); |
| server_flush_proc_kmsg(&server); |
| |
| log_debug("systemd-journald running as pid %lu", (unsigned long) getpid()); |
| driver_message(&server, SD_MESSAGE_JOURNAL_START, "Journal started"); |
| |
| sd_notify(false, |
| "READY=1\n" |
| "STATUS=Processing requests..."); |
| |
| for (;;) { |
| struct epoll_event event; |
| |
| r = epoll_wait(server.epoll_fd, &event, 1, -1); |
| if (r < 0) { |
| |
| if (errno == EINTR) |
| continue; |
| |
| log_error("epoll_wait() failed: %m"); |
| r = -errno; |
| goto finish; |
| } else if (r == 0) |
| break; |
| |
| r = process_event(&server, &event); |
| if (r < 0) |
| goto finish; |
| else if (r == 0) |
| break; |
| } |
| |
| log_debug("systemd-journald stopped as pid %lu", (unsigned long) getpid()); |
| driver_message(&server, SD_MESSAGE_JOURNAL_STOP, "Journal stopped"); |
| |
| finish: |
| sd_notify(false, |
| "STATUS=Shutting down..."); |
| |
| server_done(&server); |
| |
| return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; |
| } |