/*-*- 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 . ***/ #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef HAVE_LOGIND #include #endif #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 #include #include "acl-util.h" #endif #ifdef HAVE_SELINUX #include #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 N_IOVEC_META_FIELDS 17 #define ENTRY_SIZE_MAX (1024*1024*32) typedef enum StdoutStreamState { STDOUT_STREAM_IDENTIFIER, STDOUT_STREAM_UNIT_ID, 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; char *unit_id; 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 const char* const storage_table[] = { [STORAGE_AUTO] = "auto", [STORAGE_VOLATILE] = "volatile", [STORAGE_PERSISTENT] = "persistent", [STORAGE_NONE] = "none" }; DEFINE_STRING_TABLE_LOOKUP(storage, Storage); DEFINE_CONFIG_PARSE_ENUM(config_parse_storage, storage, Storage, "Failed to parse storage setting"); 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_metrics, 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) if (s->runtime_journal) log_error("Failed to rotate %s: %s", s->runtime_journal->path, strerror(-r)); else log_error("Failed to create new runtime journal: %s", 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) if (s->system_journal) log_error("Failed to rotate %s: %s", s->system_journal->path, strerror(-r)); else log_error("Failed to create new system journal: %s", 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) if (f->path) log_error("Failed to rotate %s: %s", f->path, strerror(-r)); else log_error("Failed to create user journal: %s", 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_oom(); 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_oom(); 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 write_to_journal(Server *s, uid_t uid, struct iovec *iovec, unsigned n) { JournalFile *f; bool vacuumed = false; int r; assert(s); assert(iovec); assert(n > 0); f = find_journal(s, uid); if (!f) return; if (journal_file_rotate_suggested(f)) { log_info("Journal header limits reached or header out-of-date, rotating."); server_rotate(s); server_vacuum(s); vacuumed = true; f = find_journal(s, uid); if (!f) return; } for (;;) { r = journal_file_append_entry(f, NULL, iovec, n, &s->seqnum, NULL, NULL); if (r >= 0) return; if (vacuumed || (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 */ r != -EBUSY && /* unclean shutdown */ r != -ESHUTDOWN /* already archived */)) { log_error("Failed to write entry, ignoring: %s", strerror(-r)); return; } if (r == -E2BIG || r == -EFBIG || r == EDQUOT || r == ENOSPC) log_info("Allocation limit reached, rotating."); else if (r == -EHOSTDOWN) log_info("Journal file from other machine, rotating."); else if (r == -EBUSY) log_info("Unlcean shutdown, rotating."); else log_warning("Journal file corrupted, rotating."); server_rotate(s); server_vacuum(s); vacuumed = true; f = find_journal(s, uid); if (!f) return; log_info("Retrying write."); } } 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, const char *unit_id) { 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; assert(s); assert(iovec); assert(n > 0); assert(n + N_IOVEC_META_FIELDS <= m); if (ucred) { uint32_t audit; #ifdef HAVE_LOGIND uid_t owner; #endif 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); } #ifdef HAVE_LOGIND 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_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); #endif if (cg_pid_get_unit(ucred->pid, &t) >= 0) { unit = strappend("_SYSTEMD_UNIT=", t); free(t); } else if (unit_id) unit = strappend("_SYSTEMD_UNIT=", unit_id); if (unit) IOVEC_SET_STRING(iovec[n++], unit); #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); write_to_journal(s, realuid == 0 ? 0 : loginuid, iovec, n); 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, NULL); } 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, const char *unit_id, int priority) { int rl; char *path = NULL, *c; assert(s); assert(iovec || n == 0); if (n == 0) return; if (LOG_PRI(priority) > s->max_level_store) 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, unit_id); } 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; } if (errno != ENOENT) log_debug("Failed to forward syslog message: %m"); } static void forward_syslog_raw(Server *s, int priority, const char *buffer, struct ucred *ucred, struct timeval *tv) { struct iovec iovec; assert(s); assert(buffer); if (LOG_PRI(priority) > s->max_level_syslog) return; 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); if (LOG_PRI(priority) > s->max_level_syslog) return; /* 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); if (LOG_PRI(priority) > s->max_level_kmsg) return; /* 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, int priority, 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; const char *tty; assert(s); assert(message); if (LOG_PRI(priority) > s->max_level_console) return; /* 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"); tty = s->tty_path ? s->tty_path : "/dev/console"; fd = open_terminal(tty, O_WRONLY|O_NOCTTY|O_CLOEXEC); if (fd < 0) { log_debug("Failed to open %s for logging: %s", tty, strerror(errno)); goto finish; } if (writev(fd, iovec, n) < 0) log_debug("Failed to write to %s for logging: %s", tty, 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; const char *orig; assert(s); assert(buf); orig = buf; parse_syslog_priority((char**) &buf, &priority); if (s->forward_to_syslog) forward_syslog_raw(s, priority, orig, ucred, tv); 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, priority, 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, NULL, 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 || buffer_size == 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, NULL, 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_oom(); 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 >= 19 && memcmp(p, "SYSLOG_IDENTIFIER=", 18) == 0) { char *t; t = strndup(p + 18, l - 18); 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_oom(); 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, priority, identifier, message, ucred); } dispatch_message(s, iovec, n, m, ucred, tv, label, label_len, NULL, 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_oom(); 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, priority, 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, s->unit_id, 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) return log_oom(); } s->state = STDOUT_STREAM_UNIT_ID; return 0; case STDOUT_STREAM_UNIT_ID: if (s->ucred.uid == 0) { if (isempty(p)) s->unit_id = NULL; else { s->unit_id = strdup(p); if (!s->unit_id) return log_oom(); } } 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) { close_nointr_nofail(fd); return log_oom(); } 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 && errno != ENOPROTOOPT) log_error("Failed to determine peer security context: %m"); #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 bool is_us(const char *pid) { pid_t t; assert(pid); if (parse_pid(pid, &t) < 0) return false; return t == getpid(); } 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); /* Avoid any messages we generated ourselves via * log_info() and friends. */ if (pid && is_us(pid)) goto finish; 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, NULL, priority); finish: 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 && (s->storage == STORAGE_PERSISTENT || s->storage == STORAGE_AUTO) && access("/run/systemd/journal/flushed", F_OK) >= 0) { /* If in auto mode: first try to create the machine * path, but not the prefix. * * If in persistent mode: create /var/log/journal and * the machine path */ if (s->storage == STORAGE_PERSISTENT) (void) mkdir("/var/log/journal/", 0755); fn = strappend("/var/log/journal/", ids); if (!fn) return -ENOMEM; (void) mkdir(fn, 0755); free(fn); fn = strjoin("/var/log/journal/", ids, "/system.journal", NULL); if (!fn) return -ENOMEM; r = journal_file_open_reliably(fn, O_RDWR|O_CREAT, 0640, &s->system_metrics, NULL, &s->system_journal); free(fn); if (r >= 0) { 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 && (s->storage != STORAGE_NONE)) { fn = strjoin("/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, &s->runtime_metrics, 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, &s->runtime_metrics, 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) { s->runtime_journal->compress = s->compress; server_fix_perms(s, s->runtime_journal, 0); } } return r; } static int server_flush_to_var(Server *s) { Object *o = NULL; int r; sd_id128_t machine; sd_journal *j; assert(s); if (s->storage != STORAGE_AUTO && s->storage != STORAGE_PERSISTENT) return 0; if (!s->runtime_journal) return 0; 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) rm_rf("/run/log/journal", 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) /* the kernel is stupid and in some race * conditions returns 0 in the middle of the * stream. */ return 0; 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); assert(ev); 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; } log_info("Received SIG%s", signal_to_string(sfsi.ssi_signo)); if (sfsi.ssi_signo == SIGUSR1) { touch("/run/systemd/journal/flushed"); server_flush_to_var(s); return 1; } if (sfsi.ssi_signo == SIGUSR2) { server_rotate(s); server_vacuum(s); return 1; } 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_RDONLY|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, SIGUSR2, -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; } else if (startswith(word, "systemd.journald")) log_warning("Invalid systemd.journald parameter. Ignoring."); 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->max_level_store = LOG_DEBUG; s->max_level_syslog = LOG_DEBUG; s->max_level_kmsg = LOG_NOTICE; s->max_level_console = LOG_INFO; 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) return log_oom(); 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); free(s->tty_path); } 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_SAFE); 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; }