1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2011 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
22 #include <sys/epoll.h>
23 #include <sys/socket.h>
25 #include <sys/signalfd.h>
29 #include <sys/ioctl.h>
30 #include <linux/sockios.h>
31 #include <sys/statvfs.h>
33 #include <systemd/sd-journal.h>
34 #include <systemd/sd-login.h>
35 #include <systemd/sd-messages.h>
36 #include <systemd/sd-daemon.h>
39 #include "journal-file.h"
40 #include "socket-util.h"
41 #include "cgroup-util.h"
43 #include "journal-rate-limit.h"
44 #include "journal-internal.h"
45 #include "conf-parser.h"
51 #include <acl/libacl.h>
55 #define USER_JOURNALS_MAX 1024
56 #define STDOUT_STREAMS_MAX 4096
58 #define DEFAULT_RATE_LIMIT_INTERVAL (10*USEC_PER_SEC)
59 #define DEFAULT_RATE_LIMIT_BURST 200
61 #define RECHECK_AVAILABLE_SPACE_USEC (30*USEC_PER_SEC)
63 #define RECHECK_VAR_AVAILABLE_USEC (30*USEC_PER_SEC)
65 #define SYSLOG_TIMEOUT_USEC (250*USEC_PER_MSEC)
67 #define N_IOVEC_META_FIELDS 16
69 typedef enum StdoutStreamState {
70 STDOUT_STREAM_IDENTIFIER,
71 STDOUT_STREAM_PRIORITY,
72 STDOUT_STREAM_LEVEL_PREFIX,
73 STDOUT_STREAM_FORWARD_TO_SYSLOG,
74 STDOUT_STREAM_FORWARD_TO_KMSG,
75 STDOUT_STREAM_FORWARD_TO_CONSOLE,
81 StdoutStreamState state;
90 bool forward_to_syslog:1;
91 bool forward_to_kmsg:1;
92 bool forward_to_console:1;
94 char buffer[LINE_MAX+1];
97 LIST_FIELDS(StdoutStream, stdout_stream);
100 static int server_flush_to_var(Server *s);
102 static uint64_t available_space(Server *s) {
107 uint64_t sum = 0, avail = 0, ss_avail = 0;
113 ts = now(CLOCK_MONOTONIC);
115 if (s->cached_available_space_timestamp + RECHECK_AVAILABLE_SPACE_USEC > ts)
116 return s->cached_available_space;
118 r = sd_id128_get_machine(&machine);
122 if (s->system_journal) {
123 f = "/var/log/journal/";
124 m = &s->system_metrics;
126 f = "/run/log/journal/";
127 m = &s->runtime_metrics;
132 p = strappend(f, sd_id128_to_string(machine, ids));
142 if (fstatvfs(dirfd(d), &ss) < 0)
147 struct dirent buf, *de;
150 k = readdir_r(d, &buf, &de);
159 if (!dirent_is_file_with_suffix(de, ".journal"))
162 if (fstatat(dirfd(d), de->d_name, &st, AT_SYMLINK_NOFOLLOW) < 0)
165 sum += (uint64_t) st.st_blocks * (uint64_t) st.st_blksize;
168 avail = sum >= m->max_use ? 0 : m->max_use - sum;
170 ss_avail = ss.f_bsize * ss.f_bavail;
172 ss_avail = ss_avail < m->keep_free ? 0 : ss_avail - m->keep_free;
174 if (ss_avail < avail)
177 s->cached_available_space = avail;
178 s->cached_available_space_timestamp = ts;
186 static void fix_perms(JournalFile *f, uid_t uid) {
191 acl_permset_t permset;
196 r = fchmod_and_fchown(f->fd, 0640, 0, 0);
198 log_warning("Failed to fix access mode/rights on %s, ignoring: %s", f->path, strerror(-r));
204 acl = acl_get_fd(f->fd);
206 log_warning("Failed to read ACL on %s, ignoring: %m", f->path);
210 r = acl_find_uid(acl, uid, &entry);
213 if (acl_create_entry(&acl, &entry) < 0 ||
214 acl_set_tag_type(entry, ACL_USER) < 0 ||
215 acl_set_qualifier(entry, &uid) < 0) {
216 log_warning("Failed to patch ACL on %s, ignoring: %m", f->path);
221 if (acl_get_permset(entry, &permset) < 0 ||
222 acl_add_perm(permset, ACL_READ) < 0 ||
223 acl_calc_mask(&acl) < 0) {
224 log_warning("Failed to patch ACL on %s, ignoring: %m", f->path);
228 if (acl_set_fd(f->fd, acl) < 0)
229 log_warning("Failed to set ACL on %s, ignoring: %m", f->path);
236 static JournalFile* find_journal(Server *s, uid_t uid) {
245 /* We split up user logs only on /var, not on /run. If the
246 * runtime file is open, we write to it exclusively, in order
247 * to guarantee proper order as soon as we flush /run to
248 * /var and close the runtime file. */
250 if (s->runtime_journal)
251 return s->runtime_journal;
254 return s->system_journal;
256 r = sd_id128_get_machine(&machine);
258 return s->system_journal;
260 f = hashmap_get(s->user_journals, UINT32_TO_PTR(uid));
264 if (asprintf(&p, "/var/log/journal/%s/user-%lu.journal", sd_id128_to_string(machine, ids), (unsigned long) uid) < 0)
265 return s->system_journal;
267 while (hashmap_size(s->user_journals) >= USER_JOURNALS_MAX) {
268 /* Too many open? Then let's close one */
269 f = hashmap_steal_first(s->user_journals);
271 journal_file_close(f);
274 r = journal_file_open(p, O_RDWR|O_CREAT, 0640, s->system_journal, &f);
278 return s->system_journal;
281 f->metrics = s->system_metrics;
282 f->compress = s->compress;
284 r = hashmap_put(s->user_journals, UINT32_TO_PTR(uid), f);
286 journal_file_close(f);
287 return s->system_journal;
293 static void server_rotate(Server *s) {
299 log_info("Rotating...");
301 if (s->runtime_journal) {
302 r = journal_file_rotate(&s->runtime_journal);
304 log_error("Failed to rotate %s: %s", s->runtime_journal->path, strerror(-r));
307 if (s->system_journal) {
308 r = journal_file_rotate(&s->system_journal);
310 log_error("Failed to rotate %s: %s", s->system_journal->path, strerror(-r));
313 HASHMAP_FOREACH_KEY(f, k, s->user_journals, i) {
314 r = journal_file_rotate(&f);
316 log_error("Failed to rotate %s: %s", f->path, strerror(-r));
318 hashmap_replace(s->user_journals, k, f);
322 static void server_vacuum(Server *s) {
328 log_info("Vacuuming...");
330 r = sd_id128_get_machine(&machine);
332 log_error("Failed to get machine ID: %s", strerror(-r));
336 sd_id128_to_string(machine, ids);
338 if (s->system_journal) {
339 if (asprintf(&p, "/var/log/journal/%s", ids) < 0) {
340 log_error("Out of memory.");
344 r = journal_directory_vacuum(p, s->system_metrics.max_use, s->system_metrics.keep_free);
345 if (r < 0 && r != -ENOENT)
346 log_error("Failed to vacuum %s: %s", p, strerror(-r));
351 if (s->runtime_journal) {
352 if (asprintf(&p, "/run/log/journal/%s", ids) < 0) {
353 log_error("Out of memory.");
357 r = journal_directory_vacuum(p, s->runtime_metrics.max_use, s->runtime_metrics.keep_free);
358 if (r < 0 && r != -ENOENT)
359 log_error("Failed to vacuum %s: %s", p, strerror(-r));
363 s->cached_available_space_timestamp = 0;
366 static char *shortened_cgroup_path(pid_t pid) {
368 char *process_path, *init_path, *path;
372 r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, pid, &process_path);
376 r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, 1, &init_path);
382 if (endswith(init_path, "/system"))
383 init_path[strlen(init_path) - 7] = 0;
384 else if (streq(init_path, "/"))
387 if (startswith(process_path, init_path)) {
390 p = strdup(process_path + strlen(init_path));
408 static void dispatch_message_real(Server *s,
409 struct iovec *iovec, unsigned n, unsigned m,
411 struct timeval *tv) {
413 char *pid = NULL, *uid = NULL, *gid = NULL,
414 *source_time = NULL, *boot_id = NULL, *machine_id = NULL,
415 *comm = NULL, *cmdline = NULL, *hostname = NULL,
416 *audit_session = NULL, *audit_loginuid = NULL,
417 *exe = NULL, *cgroup = NULL, *session = NULL,
418 *owner_uid = NULL, *unit = NULL;
424 uid_t loginuid = 0, realuid = 0;
426 bool vacuumed = false;
431 assert(n + N_IOVEC_META_FIELDS <= m);
437 realuid = ucred->uid;
439 if (asprintf(&pid, "_PID=%lu", (unsigned long) ucred->pid) >= 0)
440 IOVEC_SET_STRING(iovec[n++], pid);
442 if (asprintf(&uid, "_UID=%lu", (unsigned long) ucred->uid) >= 0)
443 IOVEC_SET_STRING(iovec[n++], uid);
445 if (asprintf(&gid, "_GID=%lu", (unsigned long) ucred->gid) >= 0)
446 IOVEC_SET_STRING(iovec[n++], gid);
448 r = get_process_comm(ucred->pid, &t);
450 comm = strappend("_COMM=", t);
454 IOVEC_SET_STRING(iovec[n++], comm);
457 r = get_process_exe(ucred->pid, &t);
459 exe = strappend("_EXE=", t);
463 IOVEC_SET_STRING(iovec[n++], exe);
466 r = get_process_cmdline(ucred->pid, LINE_MAX, false, &t);
468 cmdline = strappend("_CMDLINE=", t);
472 IOVEC_SET_STRING(iovec[n++], cmdline);
475 r = audit_session_from_pid(ucred->pid, &audit);
477 if (asprintf(&audit_session, "_AUDIT_SESSION=%lu", (unsigned long) audit) >= 0)
478 IOVEC_SET_STRING(iovec[n++], audit_session);
480 r = audit_loginuid_from_pid(ucred->pid, &loginuid);
482 if (asprintf(&audit_loginuid, "_AUDIT_LOGINUID=%lu", (unsigned long) loginuid) >= 0)
483 IOVEC_SET_STRING(iovec[n++], audit_loginuid);
485 t = shortened_cgroup_path(ucred->pid);
487 cgroup = strappend("_SYSTEMD_CGROUP=", t);
491 IOVEC_SET_STRING(iovec[n++], cgroup);
494 if (sd_pid_get_session(ucred->pid, &t) >= 0) {
495 session = strappend("_SYSTEMD_SESSION=", t);
499 IOVEC_SET_STRING(iovec[n++], session);
502 if (sd_pid_get_unit(ucred->pid, &t) >= 0) {
503 unit = strappend("_SYSTEMD_UNIT=", t);
507 IOVEC_SET_STRING(iovec[n++], unit);
510 if (sd_pid_get_owner_uid(ucred->uid, &owner) >= 0)
511 if (asprintf(&owner_uid, "_SYSTEMD_OWNER_UID=%lu", (unsigned long) owner) >= 0)
512 IOVEC_SET_STRING(iovec[n++], owner_uid);
516 if (asprintf(&source_time, "_SOURCE_REALTIME_TIMESTAMP=%llu",
517 (unsigned long long) timeval_load(tv)) >= 0)
518 IOVEC_SET_STRING(iovec[n++], source_time);
521 /* Note that strictly speaking storing the boot id here is
522 * redundant since the entry includes this in-line
523 * anyway. However, we need this indexed, too. */
524 r = sd_id128_get_boot(&id);
526 if (asprintf(&boot_id, "_BOOT_ID=%s", sd_id128_to_string(id, idbuf)) >= 0)
527 IOVEC_SET_STRING(iovec[n++], boot_id);
529 r = sd_id128_get_machine(&id);
531 if (asprintf(&machine_id, "_MACHINE_ID=%s", sd_id128_to_string(id, idbuf)) >= 0)
532 IOVEC_SET_STRING(iovec[n++], machine_id);
534 t = gethostname_malloc();
536 hostname = strappend("_HOSTNAME=", t);
539 IOVEC_SET_STRING(iovec[n++], hostname);
544 server_flush_to_var(s);
547 f = find_journal(s, realuid == 0 ? 0 : loginuid);
549 log_warning("Dropping message, as we can't find a place to store the data.");
551 r = journal_file_append_entry(f, NULL, iovec, n, &s->seqnum, NULL, NULL);
553 if (r == -E2BIG && !vacuumed) {
554 log_info("Allocation limit reached.");
560 log_info("Retrying write.");
565 log_error("Failed to write entry, ignoring: %s", strerror(-r));
579 free(audit_loginuid);
586 static void driver_message(Server *s, sd_id128_t message_id, const char *format, ...) {
587 char mid[11 + 32 + 1];
588 char buffer[16 + LINE_MAX + 1];
589 struct iovec iovec[N_IOVEC_META_FIELDS + 4];
597 IOVEC_SET_STRING(iovec[n++], "PRIORITY=5");
598 IOVEC_SET_STRING(iovec[n++], "_TRANSPORT=driver");
600 memcpy(buffer, "MESSAGE=", 8);
601 va_start(ap, format);
602 vsnprintf(buffer + 8, sizeof(buffer) - 8, format, ap);
604 char_array_0(buffer);
605 IOVEC_SET_STRING(iovec[n++], buffer);
607 snprintf(mid, sizeof(mid), "MESSAGE_ID=" SD_ID128_FORMAT_STR, SD_ID128_FORMAT_VAL(message_id));
609 IOVEC_SET_STRING(iovec[n++], mid);
612 ucred.pid = getpid();
613 ucred.uid = getuid();
614 ucred.gid = getgid();
616 dispatch_message_real(s, iovec, n, ELEMENTSOF(iovec), &ucred, NULL);
619 static void dispatch_message(Server *s,
620 struct iovec *iovec, unsigned n, unsigned m,
625 char *path = NULL, *c;
628 assert(iovec || n == 0);
636 path = shortened_cgroup_path(ucred->pid);
640 /* example: /user/lennart/3/foobar
641 * /system/dbus.service/foobar
643 * So let's cut of everything past the third /, since that is
644 * wher user directories start */
646 c = strchr(path, '/');
648 c = strchr(c+1, '/');
650 c = strchr(c+1, '/');
656 rl = journal_rate_limit_test(s->rate_limit, path, priority & LOG_PRIMASK, available_space(s));
663 /* Write a suppression message if we suppressed something */
665 driver_message(s, SD_MESSAGE_JOURNAL_DROPPED, "Suppressed %u messages from %s", rl - 1, path);
670 dispatch_message_real(s, iovec, n, m, ucred, tv);
673 static void forward_syslog_iovec(Server *s, const struct iovec *iovec, unsigned n_iovec, struct ucred *ucred, struct timeval *tv) {
674 struct msghdr msghdr;
675 struct cmsghdr *cmsg;
677 struct cmsghdr cmsghdr;
678 uint8_t buf[CMSG_SPACE(sizeof(struct ucred))];
680 union sockaddr_union sa;
687 msghdr.msg_iov = (struct iovec*) iovec;
688 msghdr.msg_iovlen = n_iovec;
691 sa.un.sun_family = AF_UNIX;
692 strncpy(sa.un.sun_path, "/run/systemd/journal/syslog", sizeof(sa.un.sun_path));
693 msghdr.msg_name = &sa;
694 msghdr.msg_namelen = offsetof(union sockaddr_union, un.sun_path) + strlen(sa.un.sun_path);
698 msghdr.msg_control = &control;
699 msghdr.msg_controllen = sizeof(control);
701 cmsg = CMSG_FIRSTHDR(&msghdr);
702 cmsg->cmsg_level = SOL_SOCKET;
703 cmsg->cmsg_type = SCM_CREDENTIALS;
704 cmsg->cmsg_len = CMSG_LEN(sizeof(struct ucred));
705 memcpy(CMSG_DATA(cmsg), ucred, sizeof(struct ucred));
706 msghdr.msg_controllen = cmsg->cmsg_len;
709 /* Forward the syslog message we received via /dev/log to
710 * /run/systemd/syslog. Unfortunately we currently can't set
711 * the SO_TIMESTAMP auxiliary data, and hence we don't. */
713 if (sendmsg(s->syslog_fd, &msghdr, MSG_NOSIGNAL) >= 0)
716 if (ucred && errno == ESRCH) {
719 /* Hmm, presumably the sender process vanished
720 * by now, so let's fix it as good as we
725 memcpy(CMSG_DATA(cmsg), &u, sizeof(struct ucred));
727 if (sendmsg(s->syslog_fd, &msghdr, MSG_NOSIGNAL) >= 0)
731 log_debug("Failed to forward syslog message: %m");
734 static void forward_syslog_raw(Server *s, const char *buffer, struct ucred *ucred, struct timeval *tv) {
740 IOVEC_SET_STRING(iovec, buffer);
741 forward_syslog_iovec(s, &iovec, 1, ucred, tv);
744 static void forward_syslog(Server *s, int priority, const char *identifier, const char *message, struct ucred *ucred, struct timeval *tv) {
745 struct iovec iovec[5];
746 char header_priority[6], header_time[64], header_pid[16];
750 char *ident_buf = NULL;
753 assert(priority >= 0);
754 assert(priority <= 999);
757 /* First: priority field */
758 snprintf(header_priority, sizeof(header_priority), "<%i>", priority);
759 char_array_0(header_priority);
760 IOVEC_SET_STRING(iovec[n++], header_priority);
762 /* Second: timestamp */
763 t = tv ? tv->tv_sec : ((time_t) (now(CLOCK_REALTIME) / USEC_PER_SEC));
767 if (strftime(header_time, sizeof(header_time), "%h %e %T ", tm) <= 0)
769 IOVEC_SET_STRING(iovec[n++], header_time);
771 /* Third: identifier and PID */
774 get_process_comm(ucred->pid, &ident_buf);
775 identifier = ident_buf;
778 snprintf(header_pid, sizeof(header_pid), "[%lu]: ", (unsigned long) ucred->pid);
779 char_array_0(header_pid);
782 IOVEC_SET_STRING(iovec[n++], identifier);
784 IOVEC_SET_STRING(iovec[n++], header_pid);
785 } else if (identifier) {
786 IOVEC_SET_STRING(iovec[n++], identifier);
787 IOVEC_SET_STRING(iovec[n++], ": ");
790 /* Fourth: message */
791 IOVEC_SET_STRING(iovec[n++], message);
793 forward_syslog_iovec(s, iovec, n, ucred, tv);
798 static int fixup_priority(int priority) {
800 if ((priority & LOG_FACMASK) == 0)
801 return (priority & LOG_PRIMASK) | LOG_USER;
806 static void forward_kmsg(Server *s, int priority, const char *identifier, const char *message, struct ucred *ucred) {
807 struct iovec iovec[5];
808 char header_priority[6], header_pid[16];
810 char *ident_buf = NULL;
814 assert(priority >= 0);
815 assert(priority <= 999);
818 /* Never allow messages with kernel facility to be written to
819 * kmsg, regardless where the data comes from. */
820 priority = fixup_priority(priority);
822 /* First: priority field */
823 snprintf(header_priority, sizeof(header_priority), "<%i>", priority);
824 char_array_0(header_priority);
825 IOVEC_SET_STRING(iovec[n++], header_priority);
827 /* Second: identifier and PID */
830 get_process_comm(ucred->pid, &ident_buf);
831 identifier = ident_buf;
834 snprintf(header_pid, sizeof(header_pid), "[%lu]: ", (unsigned long) ucred->pid);
835 char_array_0(header_pid);
838 IOVEC_SET_STRING(iovec[n++], identifier);
840 IOVEC_SET_STRING(iovec[n++], header_pid);
841 } else if (identifier) {
842 IOVEC_SET_STRING(iovec[n++], identifier);
843 IOVEC_SET_STRING(iovec[n++], ": ");
846 /* Fourth: message */
847 IOVEC_SET_STRING(iovec[n++], message);
848 IOVEC_SET_STRING(iovec[n++], "\n");
850 fd = open("/dev/kmsg", O_WRONLY|O_NOCTTY|O_CLOEXEC);
852 log_debug("Failed to open /dev/kmsg for logging: %s", strerror(errno));
856 if (writev(fd, iovec, n) < 0)
857 log_debug("Failed to write to /dev/kmsg for logging: %s", strerror(errno));
859 close_nointr_nofail(fd);
865 static void forward_console(Server *s, const char *identifier, const char *message, struct ucred *ucred) {
866 struct iovec iovec[4];
869 char *ident_buf = NULL;
874 /* First: identifier and PID */
877 get_process_comm(ucred->pid, &ident_buf);
878 identifier = ident_buf;
881 snprintf(header_pid, sizeof(header_pid), "[%lu]: ", (unsigned long) ucred->pid);
882 char_array_0(header_pid);
885 IOVEC_SET_STRING(iovec[n++], identifier);
887 IOVEC_SET_STRING(iovec[n++], header_pid);
888 } else if (identifier) {
889 IOVEC_SET_STRING(iovec[n++], identifier);
890 IOVEC_SET_STRING(iovec[n++], ": ");
894 IOVEC_SET_STRING(iovec[n++], message);
895 IOVEC_SET_STRING(iovec[n++], "\n");
897 fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC);
899 log_debug("Failed to open /dev/console for logging: %s", strerror(errno));
903 if (writev(fd, iovec, n) < 0)
904 log_debug("Failed to write to /dev/console for logging: %s", strerror(errno));
906 close_nointr_nofail(fd);
912 static void read_identifier(const char **buf, char **identifier, char **pid) {
923 p += strspn(p, WHITESPACE);
924 l = strcspn(p, WHITESPACE);
939 t = strndup(p+k+1, l-k-2);
959 *buf += strspn(*buf, WHITESPACE);
962 static void process_syslog_message(Server *s, const char *buf, struct ucred *ucred, struct timeval *tv) {
963 char *message = NULL, *syslog_priority = NULL, *syslog_facility = NULL, *syslog_identifier = NULL, *syslog_pid = NULL;
964 struct iovec iovec[N_IOVEC_META_FIELDS + 6];
966 int priority = LOG_USER | LOG_INFO;
967 char *identifier = NULL, *pid = NULL;
972 if (s->forward_to_syslog)
973 forward_syslog_raw(s, buf, ucred, tv);
975 parse_syslog_priority((char**) &buf, &priority);
976 skip_syslog_date((char**) &buf);
977 read_identifier(&buf, &identifier, &pid);
979 if (s->forward_to_kmsg)
980 forward_kmsg(s, priority, identifier, buf, ucred);
982 if (s->forward_to_console)
983 forward_console(s, identifier, buf, ucred);
985 IOVEC_SET_STRING(iovec[n++], "_TRANSPORT=syslog");
987 if (asprintf(&syslog_priority, "PRIORITY=%i", priority & LOG_PRIMASK) >= 0)
988 IOVEC_SET_STRING(iovec[n++], syslog_priority);
990 if (priority & LOG_FACMASK)
991 if (asprintf(&syslog_facility, "SYSLOG_FACILITY=%i", LOG_FAC(priority)) >= 0)
992 IOVEC_SET_STRING(iovec[n++], syslog_facility);
995 syslog_identifier = strappend("SYSLOG_IDENTIFIER=", identifier);
996 if (syslog_identifier)
997 IOVEC_SET_STRING(iovec[n++], syslog_identifier);
1001 syslog_pid = strappend("SYSLOG_PID=", pid);
1003 IOVEC_SET_STRING(iovec[n++], syslog_pid);
1006 message = strappend("MESSAGE=", buf);
1008 IOVEC_SET_STRING(iovec[n++], message);
1010 dispatch_message(s, iovec, n, ELEMENTSOF(iovec), ucred, tv, priority);
1015 free(syslog_priority);
1016 free(syslog_facility);
1017 free(syslog_identifier);
1020 static bool valid_user_field(const char *p, size_t l) {
1023 /* We kinda enforce POSIX syntax recommendations for
1024 environment variables here, but make a couple of additional
1027 http://pubs.opengroup.org/onlinepubs/000095399/basedefs/xbd_chap08.html */
1029 /* No empty field names */
1033 /* Don't allow names longer than 64 chars */
1037 /* Variables starting with an underscore are protected */
1041 /* Don't allow digits as first character */
1042 if (p[0] >= '0' && p[0] <= '9')
1045 /* Only allow A-Z0-9 and '_' */
1046 for (a = p; a < p + l; a++)
1047 if (!((*a >= 'A' && *a <= 'Z') ||
1048 (*a >= '0' && *a <= '9') ||
1055 static void process_native_message(Server *s, const void *buffer, size_t buffer_size, struct ucred *ucred, struct timeval *tv) {
1056 struct iovec *iovec = NULL;
1057 unsigned n = 0, m = 0, j, tn = (unsigned) -1;
1060 int priority = LOG_INFO;
1061 char *identifier = NULL, *message = NULL;
1064 assert(buffer || n == 0);
1067 remaining = buffer_size;
1069 while (remaining > 0) {
1072 e = memchr(p, '\n', remaining);
1075 /* Trailing noise, let's ignore it, and flush what we collected */
1076 log_debug("Received message with trailing noise, ignoring.");
1081 /* Entry separator */
1082 dispatch_message(s, iovec, n, m, ucred, tv, priority);
1084 priority = LOG_INFO;
1091 if (*p == '.' || *p == '#') {
1092 /* Ignore control commands for now, and
1094 remaining -= (e - p) + 1;
1099 /* A property follows */
1101 if (n+N_IOVEC_META_FIELDS >= m) {
1105 u = MAX((n+N_IOVEC_META_FIELDS+1) * 2U, 4U);
1106 c = realloc(iovec, u * sizeof(struct iovec));
1108 log_error("Out of memory");
1116 q = memchr(p, '=', e - p);
1118 if (valid_user_field(p, q - p)) {
1123 /* If the field name starts with an
1124 * underscore, skip the variable,
1125 * since that indidates a trusted
1127 iovec[n].iov_base = (char*) p;
1128 iovec[n].iov_len = l;
1131 /* We need to determine the priority
1132 * of this entry for the rate limiting
1135 memcmp(p, "PRIORITY=", 9) == 0 &&
1136 p[9] >= '0' && p[9] <= '9')
1137 priority = (priority & LOG_FACMASK) | (p[9] - '0');
1140 memcmp(p, "SYSLOG_FACILITY=", 16) == 0 &&
1141 p[16] >= '0' && p[16] <= '9')
1142 priority = (priority & LOG_PRIMASK) | ((p[16] - '0') << 3);
1145 memcmp(p, "SYSLOG_FACILITY=", 16) == 0 &&
1146 p[16] >= '0' && p[16] <= '9' &&
1147 p[17] >= '0' && p[17] <= '9')
1148 priority = (priority & LOG_PRIMASK) | (((p[16] - '0')*10 + (p[17] - '0')) << 3);
1151 memcmp(p, "SYSLOG_IDENTIFIER=", 11) == 0) {
1154 t = strndup(p + 11, l - 11);
1159 } else if (l >= 8 &&
1160 memcmp(p, "MESSAGE=", 8) == 0) {
1163 t = strndup(p + 8, l - 8);
1171 remaining -= (e - p) + 1;
1178 if (remaining < e - p + 1 + sizeof(uint64_t) + 1) {
1179 log_debug("Failed to parse message, ignoring.");
1183 memcpy(&l, e + 1, sizeof(uint64_t));
1186 if (remaining < e - p + 1 + sizeof(uint64_t) + l + 1 ||
1187 e[1+sizeof(uint64_t)+l] != '\n') {
1188 log_debug("Failed to parse message, ignoring.");
1192 k = malloc((e - p) + 1 + l);
1194 log_error("Out of memory");
1198 memcpy(k, p, e - p);
1200 memcpy(k + (e - p) + 1, e + 1 + sizeof(uint64_t), l);
1202 if (valid_user_field(p, e - p)) {
1203 iovec[n].iov_base = k;
1204 iovec[n].iov_len = (e - p) + 1 + l;
1209 remaining -= (e - p) + 1 + sizeof(uint64_t) + l + 1;
1210 p = e + 1 + sizeof(uint64_t) + l + 1;
1218 IOVEC_SET_STRING(iovec[tn], "_TRANSPORT=journal");
1221 if (s->forward_to_syslog)
1222 forward_syslog(s, priority, identifier, message, ucred, tv);
1224 if (s->forward_to_kmsg)
1225 forward_kmsg(s, priority, identifier, message, ucred);
1227 if (s->forward_to_console)
1228 forward_console(s, identifier, message, ucred);
1231 dispatch_message(s, iovec, n, m, ucred, tv, priority);
1234 for (j = 0; j < n; j++) {
1238 if (iovec[j].iov_base < buffer ||
1239 (const uint8_t*) iovec[j].iov_base >= (const uint8_t*) buffer + buffer_size)
1240 free(iovec[j].iov_base);
1247 static int stdout_stream_log(StdoutStream *s, const char *p) {
1248 struct iovec iovec[N_IOVEC_META_FIELDS + 5];
1249 char *message = NULL, *syslog_priority = NULL, *syslog_facility = NULL, *syslog_identifier = NULL;
1256 priority = s->priority;
1258 if (s->level_prefix)
1259 parse_syslog_priority((char**) &p, &priority);
1261 if (s->forward_to_syslog || s->server->forward_to_syslog)
1262 forward_syslog(s->server, fixup_priority(priority), s->identifier, p, &s->ucred, NULL);
1264 if (s->forward_to_kmsg || s->server->forward_to_kmsg)
1265 forward_kmsg(s->server, priority, s->identifier, p, &s->ucred);
1267 if (s->forward_to_console || s->server->forward_to_console)
1268 forward_console(s->server, s->identifier, p, &s->ucred);
1270 IOVEC_SET_STRING(iovec[n++], "_TRANSPORT=stdout");
1272 if (asprintf(&syslog_priority, "PRIORITY=%i", priority & LOG_PRIMASK) >= 0)
1273 IOVEC_SET_STRING(iovec[n++], syslog_priority);
1275 if (priority & LOG_FACMASK)
1276 if (asprintf(&syslog_facility, "SYSLOG_FACILITY=%i", LOG_FAC(priority)) >= 0)
1277 IOVEC_SET_STRING(iovec[n++], syslog_facility);
1279 if (s->identifier) {
1280 syslog_identifier = strappend("SYSLOG_IDENTIFIER=", s->identifier);
1281 if (syslog_identifier)
1282 IOVEC_SET_STRING(iovec[n++], syslog_identifier);
1285 message = strappend("MESSAGE=", p);
1287 IOVEC_SET_STRING(iovec[n++], message);
1289 dispatch_message(s->server, iovec, n, ELEMENTSOF(iovec), &s->ucred, NULL, priority);
1292 free(syslog_priority);
1293 free(syslog_facility);
1294 free(syslog_identifier);
1299 static int stdout_stream_line(StdoutStream *s, char *p) {
1309 case STDOUT_STREAM_IDENTIFIER:
1310 s->identifier = strdup(p);
1311 if (!s->identifier) {
1312 log_error("Out of memory");
1316 s->state = STDOUT_STREAM_PRIORITY;
1319 case STDOUT_STREAM_PRIORITY:
1320 r = safe_atoi(p, &s->priority);
1321 if (r < 0 || s->priority <= 0 || s->priority >= 999) {
1322 log_warning("Failed to parse log priority line.");
1326 s->state = STDOUT_STREAM_LEVEL_PREFIX;
1329 case STDOUT_STREAM_LEVEL_PREFIX:
1330 r = parse_boolean(p);
1332 log_warning("Failed to parse level prefix line.");
1336 s->level_prefix = !!r;
1337 s->state = STDOUT_STREAM_FORWARD_TO_SYSLOG;
1340 case STDOUT_STREAM_FORWARD_TO_SYSLOG:
1341 r = parse_boolean(p);
1343 log_warning("Failed to parse forward to syslog line.");
1347 s->forward_to_syslog = !!r;
1348 s->state = STDOUT_STREAM_FORWARD_TO_KMSG;
1351 case STDOUT_STREAM_FORWARD_TO_KMSG:
1352 r = parse_boolean(p);
1354 log_warning("Failed to parse copy to kmsg line.");
1358 s->forward_to_kmsg = !!r;
1359 s->state = STDOUT_STREAM_FORWARD_TO_CONSOLE;
1362 case STDOUT_STREAM_FORWARD_TO_CONSOLE:
1363 r = parse_boolean(p);
1365 log_warning("Failed to parse copy to console line.");
1369 s->forward_to_console = !!r;
1370 s->state = STDOUT_STREAM_RUNNING;
1373 case STDOUT_STREAM_RUNNING:
1374 return stdout_stream_log(s, p);
1377 assert_not_reached("Unknown stream state");
1380 static int stdout_stream_scan(StdoutStream *s, bool force_flush) {
1388 remaining = s->length;
1393 end = memchr(p, '\n', remaining);
1396 else if (remaining >= sizeof(s->buffer) - 1) {
1397 end = p + sizeof(s->buffer) - 1;
1404 r = stdout_stream_line(s, p);
1412 if (force_flush && remaining > 0) {
1414 r = stdout_stream_line(s, p);
1422 if (p > s->buffer) {
1423 memmove(s->buffer, p, remaining);
1424 s->length = remaining;
1430 static int stdout_stream_process(StdoutStream *s) {
1436 l = read(s->fd, s->buffer+s->length, sizeof(s->buffer)-1-s->length);
1439 if (errno == EAGAIN)
1442 log_warning("Failed to read from stream: %m");
1447 r = stdout_stream_scan(s, true);
1455 r = stdout_stream_scan(s, false);
1463 static void stdout_stream_free(StdoutStream *s) {
1467 assert(s->server->n_stdout_streams > 0);
1468 s->server->n_stdout_streams --;
1469 LIST_REMOVE(StdoutStream, stdout_stream, s->server->stdout_streams, s);
1474 epoll_ctl(s->server->epoll_fd, EPOLL_CTL_DEL, s->fd, NULL);
1476 close_nointr_nofail(s->fd);
1479 free(s->identifier);
1483 static int stdout_stream_new(Server *s) {
1484 StdoutStream *stream;
1487 struct epoll_event ev;
1491 fd = accept4(s->stdout_fd, NULL, NULL, SOCK_NONBLOCK|SOCK_CLOEXEC);
1493 if (errno == EAGAIN)
1496 log_error("Failed to accept stdout connection: %m");
1500 if (s->n_stdout_streams >= STDOUT_STREAMS_MAX) {
1501 log_warning("Too many stdout streams, refusing connection.");
1502 close_nointr_nofail(fd);
1506 stream = new0(StdoutStream, 1);
1508 log_error("Out of memory.");
1509 close_nointr_nofail(fd);
1515 len = sizeof(stream->ucred);
1516 if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &stream->ucred, &len) < 0) {
1517 log_error("Failed to determine peer credentials: %m");
1522 if (shutdown(fd, SHUT_WR) < 0) {
1523 log_error("Failed to shutdown writing side of socket: %m");
1529 ev.data.ptr = stream;
1530 ev.events = EPOLLIN;
1531 if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0) {
1532 log_error("Failed to add stream to event loop: %m");
1538 LIST_PREPEND(StdoutStream, stdout_stream, s->stdout_streams, stream);
1539 s->n_stdout_streams ++;
1544 stdout_stream_free(stream);
1548 static int parse_kernel_timestamp(char **_p, usec_t *t) {
1559 if (strlen(p) < 14 || p[0] != '[' || p[13] != ']' || p[6] != '.')
1564 for (i = 1; i <= 5; i++) {
1570 k = undecchar(p[i]);
1577 for (i = 7; i <= 12; i++) {
1580 k = undecchar(p[i]);
1589 *_p += strspn(*_p, WHITESPACE);
1594 static void proc_kmsg_line(Server *s, const char *p) {
1595 struct iovec iovec[N_IOVEC_META_FIELDS + 7];
1596 char *message = NULL, *syslog_priority = NULL, *syslog_pid = NULL, *syslog_facility = NULL, *syslog_identifier = NULL, *source_time = NULL;
1597 int priority = LOG_KERN | LOG_INFO;
1600 char *identifier = NULL, *pid = NULL;
1605 parse_syslog_priority((char **) &p, &priority);
1607 if (s->forward_to_kmsg && (priority & LOG_FACMASK) != LOG_KERN)
1610 if (parse_kernel_timestamp((char **) &p, &usec) > 0) {
1611 if (asprintf(&source_time, "_SOURCE_MONOTONIC_TIMESTAMP=%llu",
1612 (unsigned long long) usec) >= 0)
1613 IOVEC_SET_STRING(iovec[n++], source_time);
1616 IOVEC_SET_STRING(iovec[n++], "_TRANSPORT=kernel");
1618 if (asprintf(&syslog_priority, "PRIORITY=%i", priority & LOG_PRIMASK) >= 0)
1619 IOVEC_SET_STRING(iovec[n++], syslog_priority);
1621 if ((priority & LOG_FACMASK) == LOG_KERN) {
1623 if (s->forward_to_syslog)
1624 forward_syslog(s, priority, "kernel", p, NULL, NULL);
1626 IOVEC_SET_STRING(iovec[n++], "SYSLOG_IDENTIFIER=kernel");
1628 read_identifier(&p, &identifier, &pid);
1630 if (s->forward_to_syslog)
1631 forward_syslog(s, priority, identifier, p, NULL, NULL);
1634 syslog_identifier = strappend("SYSLOG_IDENTIFIER=", identifier);
1635 if (syslog_identifier)
1636 IOVEC_SET_STRING(iovec[n++], syslog_identifier);
1640 syslog_pid = strappend("SYSLOG_PID=", pid);
1642 IOVEC_SET_STRING(iovec[n++], syslog_pid);
1645 if (asprintf(&syslog_facility, "SYSLOG_FACILITY=%i", LOG_FAC(priority)) >= 0)
1646 IOVEC_SET_STRING(iovec[n++], syslog_facility);
1649 message = strappend("MESSAGE=", p);
1651 IOVEC_SET_STRING(iovec[n++], message);
1654 dispatch_message(s, iovec, n, ELEMENTSOF(iovec), NULL, NULL, priority);
1657 free(syslog_priority);
1658 free(syslog_identifier);
1660 free(syslog_facility);
1666 static void proc_kmsg_scan(Server *s) {
1672 p = s->proc_kmsg_buffer;
1673 remaining = s->proc_kmsg_length;
1678 end = memchr(p, '\n', remaining);
1681 else if (remaining >= sizeof(s->proc_kmsg_buffer) - 1) {
1682 end = p + sizeof(s->proc_kmsg_buffer) - 1;
1689 proc_kmsg_line(s, p);
1695 if (p > s->proc_kmsg_buffer) {
1696 memmove(s->proc_kmsg_buffer, p, remaining);
1697 s->proc_kmsg_length = remaining;
1701 static int system_journal_open(Server *s) {
1707 r = sd_id128_get_machine(&machine);
1711 sd_id128_to_string(machine, ids);
1713 if (!s->system_journal) {
1715 /* First try to create the machine path, but not the prefix */
1716 fn = strappend("/var/log/journal/", ids);
1719 (void) mkdir(fn, 0755);
1722 /* The create the system journal file */
1723 fn = join("/var/log/journal/", ids, "/system.journal", NULL);
1727 r = journal_file_open(fn, O_RDWR|O_CREAT, 0640, NULL, &s->system_journal);
1731 journal_default_metrics(&s->system_metrics, s->system_journal->fd);
1733 s->system_journal->metrics = s->system_metrics;
1734 s->system_journal->compress = s->compress;
1736 fix_perms(s->system_journal, 0);
1739 if (r != -ENOENT && r != -EROFS)
1740 log_warning("Failed to open system journal: %s", strerror(-r));
1746 if (!s->runtime_journal) {
1748 fn = join("/run/log/journal/", ids, "/system.journal", NULL);
1752 if (s->system_journal) {
1754 /* Try to open the runtime journal, but only
1755 * if it already exists, so that we can flush
1756 * it into the system journal */
1758 r = journal_file_open(fn, O_RDWR, 0640, NULL, &s->runtime_journal);
1763 log_warning("Failed to open runtime journal: %s", strerror(-r));
1770 /* OK, we really need the runtime journal, so create
1771 * it if necessary. */
1773 (void) mkdir_parents(fn, 0755);
1774 r = journal_file_open(fn, O_RDWR|O_CREAT, 0640, NULL, &s->runtime_journal);
1778 log_error("Failed to open runtime journal: %s", strerror(-r));
1783 if (s->runtime_journal) {
1784 journal_default_metrics(&s->runtime_metrics, s->runtime_journal->fd);
1786 s->runtime_journal->metrics = s->runtime_metrics;
1787 s->runtime_journal->compress = s->compress;
1789 fix_perms(s->runtime_journal, 0);
1796 static int server_flush_to_var(Server *s) {
1797 char path[] = "/run/log/journal/xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
1806 if (!s->runtime_journal)
1809 ts = now(CLOCK_MONOTONIC);
1810 if (s->var_available_timestamp + RECHECK_VAR_AVAILABLE_USEC > ts)
1813 s->var_available_timestamp = ts;
1815 system_journal_open(s);
1817 if (!s->system_journal)
1820 log_info("Flushing to /var...");
1822 r = sd_id128_get_machine(&machine);
1824 log_error("Failed to get machine id: %s", strerror(-r));
1828 r = sd_journal_open(&j, SD_JOURNAL_RUNTIME_ONLY);
1830 log_error("Failed to read runtime journal: %s", strerror(-r));
1834 SD_JOURNAL_FOREACH(j) {
1837 f = j->current_file;
1838 assert(f && f->current_offset > 0);
1840 r = journal_file_move_to_object(f, OBJECT_ENTRY, f->current_offset, &o);
1842 log_error("Can't read entry: %s", strerror(-r));
1846 r = journal_file_copy_entry(f, s->system_journal, o, f->current_offset, NULL, NULL, NULL);
1848 log_info("Allocation limit reached.");
1850 journal_file_post_change(s->system_journal);
1854 r = journal_file_copy_entry(f, s->system_journal, o, f->current_offset, NULL, NULL, NULL);
1858 log_error("Can't write entry: %s", strerror(-r));
1864 journal_file_post_change(s->system_journal);
1866 journal_file_close(s->runtime_journal);
1867 s->runtime_journal = NULL;
1870 sd_id128_to_string(machine, path + 17);
1871 rm_rf(path, false, true, false);
1877 static int server_read_proc_kmsg(Server *s) {
1880 assert(s->proc_kmsg_fd >= 0);
1882 l = read(s->proc_kmsg_fd, s->proc_kmsg_buffer + s->proc_kmsg_length, sizeof(s->proc_kmsg_buffer) - 1 - s->proc_kmsg_length);
1885 if (errno == EAGAIN || errno == EINTR)
1888 log_error("Failed to read from kernel: %m");
1892 s->proc_kmsg_length += l;
1898 static int server_flush_proc_kmsg(Server *s) {
1903 if (s->proc_kmsg_fd < 0)
1906 log_info("Flushing /proc/kmsg...");
1909 r = server_read_proc_kmsg(s);
1920 static int process_event(Server *s, struct epoll_event *ev) {
1923 if (ev->data.fd == s->signal_fd) {
1924 struct signalfd_siginfo sfsi;
1927 if (ev->events != EPOLLIN) {
1928 log_info("Got invalid event from epoll.");
1932 n = read(s->signal_fd, &sfsi, sizeof(sfsi));
1933 if (n != sizeof(sfsi)) {
1938 if (errno == EINTR || errno == EAGAIN)
1944 if (sfsi.ssi_signo == SIGUSR1) {
1945 server_flush_to_var(s);
1949 log_debug("Received SIG%s", signal_to_string(sfsi.ssi_signo));
1952 } else if (ev->data.fd == s->proc_kmsg_fd) {
1955 if (ev->events != EPOLLIN) {
1956 log_info("Got invalid event from epoll.");
1960 r = server_read_proc_kmsg(s);
1966 } else if (ev->data.fd == s->native_fd ||
1967 ev->data.fd == s->syslog_fd) {
1969 if (ev->events != EPOLLIN) {
1970 log_info("Got invalid event from epoll.");
1975 struct msghdr msghdr;
1977 struct ucred *ucred = NULL;
1978 struct timeval *tv = NULL;
1979 struct cmsghdr *cmsg;
1981 struct cmsghdr cmsghdr;
1982 uint8_t buf[CMSG_SPACE(sizeof(struct ucred)) +
1983 CMSG_SPACE(sizeof(struct timeval))];
1988 if (ioctl(ev->data.fd, SIOCINQ, &v) < 0) {
1989 log_error("SIOCINQ failed: %m");
1996 if (s->buffer_size < (size_t) v) {
2000 l = MAX(LINE_MAX + (size_t) v, s->buffer_size * 2);
2001 b = realloc(s->buffer, l+1);
2004 log_error("Couldn't increase buffer.");
2013 iovec.iov_base = s->buffer;
2014 iovec.iov_len = s->buffer_size;
2018 msghdr.msg_iov = &iovec;
2019 msghdr.msg_iovlen = 1;
2020 msghdr.msg_control = &control;
2021 msghdr.msg_controllen = sizeof(control);
2023 n = recvmsg(ev->data.fd, &msghdr, MSG_DONTWAIT);
2026 if (errno == EINTR || errno == EAGAIN)
2029 log_error("recvmsg() failed: %m");
2033 for (cmsg = CMSG_FIRSTHDR(&msghdr); cmsg; cmsg = CMSG_NXTHDR(&msghdr, cmsg)) {
2035 if (cmsg->cmsg_level == SOL_SOCKET &&
2036 cmsg->cmsg_type == SCM_CREDENTIALS &&
2037 cmsg->cmsg_len == CMSG_LEN(sizeof(struct ucred)))
2038 ucred = (struct ucred*) CMSG_DATA(cmsg);
2039 else if (cmsg->cmsg_level == SOL_SOCKET &&
2040 cmsg->cmsg_type == SO_TIMESTAMP &&
2041 cmsg->cmsg_len == CMSG_LEN(sizeof(struct timeval)))
2042 tv = (struct timeval*) CMSG_DATA(cmsg);
2045 if (ev->data.fd == s->syslog_fd) {
2048 e = memchr(s->buffer, '\n', n);
2054 process_syslog_message(s, strstrip(s->buffer), ucred, tv);
2056 process_native_message(s, s->buffer, n, ucred, tv);
2061 } else if (ev->data.fd == s->stdout_fd) {
2063 if (ev->events != EPOLLIN) {
2064 log_info("Got invalid event from epoll.");
2068 stdout_stream_new(s);
2072 StdoutStream *stream;
2074 if ((ev->events|EPOLLIN|EPOLLHUP) != (EPOLLIN|EPOLLHUP)) {
2075 log_info("Got invalid event from epoll.");
2079 /* If it is none of the well-known fds, it must be an
2080 * stdout stream fd. Note that this is a bit ugly here
2081 * (since we rely that none of the well-known fds
2082 * could be interpreted as pointer), but nonetheless
2083 * safe, since the well-known fds would never get an
2084 * fd > 4096, i.e. beyond the first memory page */
2086 stream = ev->data.ptr;
2088 if (stdout_stream_process(stream) <= 0)
2089 stdout_stream_free(stream);
2094 log_error("Unknown event.");
2098 static int open_syslog_socket(Server *s) {
2099 union sockaddr_union sa;
2101 struct epoll_event ev;
2106 if (s->syslog_fd < 0) {
2108 s->syslog_fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
2109 if (s->syslog_fd < 0) {
2110 log_error("socket() failed: %m");
2115 sa.un.sun_family = AF_UNIX;
2116 strncpy(sa.un.sun_path, "/dev/log", sizeof(sa.un.sun_path));
2118 unlink(sa.un.sun_path);
2120 r = bind(s->syslog_fd, &sa.sa, offsetof(union sockaddr_union, un.sun_path) + strlen(sa.un.sun_path));
2122 log_error("bind() failed: %m");
2126 chmod(sa.un.sun_path, 0666);
2130 r = setsockopt(s->syslog_fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one));
2132 log_error("SO_PASSCRED failed: %m");
2137 r = setsockopt(s->syslog_fd, SOL_SOCKET, SO_TIMESTAMP, &one, sizeof(one));
2139 log_error("SO_TIMESTAMP failed: %m");
2143 /* Since we use the same socket for forwarding this to some
2144 * other syslog implementation, make sure we don't hang
2146 timeval_store(&tv, SYSLOG_TIMEOUT_USEC);
2147 if (setsockopt(s->syslog_fd, SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof(tv)) < 0) {
2148 log_error("SO_SNDTIMEO failed: %m");
2153 ev.events = EPOLLIN;
2154 ev.data.fd = s->syslog_fd;
2155 if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->syslog_fd, &ev) < 0) {
2156 log_error("Failed to add syslog server fd to epoll object: %m");
2163 static int open_native_socket(Server*s) {
2164 union sockaddr_union sa;
2166 struct epoll_event ev;
2170 if (s->native_fd < 0) {
2172 s->native_fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
2173 if (s->native_fd < 0) {
2174 log_error("socket() failed: %m");
2179 sa.un.sun_family = AF_UNIX;
2180 strncpy(sa.un.sun_path, "/run/systemd/journal/socket", sizeof(sa.un.sun_path));
2182 unlink(sa.un.sun_path);
2184 r = bind(s->native_fd, &sa.sa, offsetof(union sockaddr_union, un.sun_path) + strlen(sa.un.sun_path));
2186 log_error("bind() failed: %m");
2190 chmod(sa.un.sun_path, 0666);
2194 r = setsockopt(s->native_fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one));
2196 log_error("SO_PASSCRED failed: %m");
2201 r = setsockopt(s->native_fd, SOL_SOCKET, SO_TIMESTAMP, &one, sizeof(one));
2203 log_error("SO_TIMESTAMP failed: %m");
2208 ev.events = EPOLLIN;
2209 ev.data.fd = s->native_fd;
2210 if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->native_fd, &ev) < 0) {
2211 log_error("Failed to add native server fd to epoll object: %m");
2218 static int open_stdout_socket(Server *s) {
2219 union sockaddr_union sa;
2221 struct epoll_event ev;
2225 if (s->stdout_fd < 0) {
2227 s->stdout_fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
2228 if (s->stdout_fd < 0) {
2229 log_error("socket() failed: %m");
2234 sa.un.sun_family = AF_UNIX;
2235 strncpy(sa.un.sun_path, "/run/systemd/journal/stdout", sizeof(sa.un.sun_path));
2237 unlink(sa.un.sun_path);
2239 r = bind(s->stdout_fd, &sa.sa, offsetof(union sockaddr_union, un.sun_path) + strlen(sa.un.sun_path));
2241 log_error("bind() failed: %m");
2245 chmod(sa.un.sun_path, 0666);
2247 if (listen(s->stdout_fd, SOMAXCONN) < 0) {
2248 log_error("liste() failed: %m");
2254 ev.events = EPOLLIN;
2255 ev.data.fd = s->stdout_fd;
2256 if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->stdout_fd, &ev) < 0) {
2257 log_error("Failed to add stdout server fd to epoll object: %m");
2264 static int open_proc_kmsg(Server *s) {
2265 struct epoll_event ev;
2269 if (!s->import_proc_kmsg)
2273 s->proc_kmsg_fd = open("/proc/kmsg", O_CLOEXEC|O_NONBLOCK|O_NOCTTY);
2274 if (s->proc_kmsg_fd < 0) {
2275 log_warning("Failed to open /proc/kmsg, ignoring: %m");
2280 ev.events = EPOLLIN;
2281 ev.data.fd = s->proc_kmsg_fd;
2282 if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->proc_kmsg_fd, &ev) < 0) {
2283 log_error("Failed to add /proc/kmsg fd to epoll object: %m");
2290 static int open_signalfd(Server *s) {
2292 struct epoll_event ev;
2296 assert_se(sigemptyset(&mask) == 0);
2297 sigset_add_many(&mask, SIGINT, SIGTERM, SIGUSR1, -1);
2298 assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
2300 s->signal_fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC);
2301 if (s->signal_fd < 0) {
2302 log_error("signalfd(): %m");
2307 ev.events = EPOLLIN;
2308 ev.data.fd = s->signal_fd;
2310 if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->signal_fd, &ev) < 0) {
2311 log_error("epoll_ctl(): %m");
2318 static int server_parse_proc_cmdline(Server *s) {
2319 char *line, *w, *state;
2323 if (detect_container(NULL) > 0)
2326 r = read_one_line_file("/proc/cmdline", &line);
2328 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
2332 FOREACH_WORD_QUOTED(w, l, line, state) {
2335 word = strndup(w, l);
2341 if (startswith(word, "systemd_journald.forward_to_syslog=")) {
2342 r = parse_boolean(word + 35);
2344 log_warning("Failed to parse forward to syslog switch %s. Ignoring.", word + 35);
2346 s->forward_to_syslog = r;
2347 } else if (startswith(word, "systemd_journald.forward_to_kmsg=")) {
2348 r = parse_boolean(word + 33);
2350 log_warning("Failed to parse forward to kmsg switch %s. Ignoring.", word + 33);
2352 s->forward_to_kmsg = r;
2353 } else if (startswith(word, "systemd_journald.forward_to_console=")) {
2354 r = parse_boolean(word + 36);
2356 log_warning("Failed to parse forward to console switch %s. Ignoring.", word + 36);
2358 s->forward_to_console = r;
2371 static int server_parse_config_file(Server *s) {
2378 fn = "/etc/systemd/systemd-journald.conf";
2379 f = fopen(fn, "re");
2381 if (errno == ENOENT)
2384 log_warning("Failed to open configuration file %s: %m", fn);
2388 r = config_parse(fn, f, "Journal\0", config_item_perf_lookup, (void*) journald_gperf_lookup, false, s);
2390 log_warning("Failed to parse configuration file: %s", strerror(-r));
2397 static int server_init(Server *s) {
2403 s->syslog_fd = s->native_fd = s->stdout_fd = s->signal_fd = s->epoll_fd = s->proc_kmsg_fd = -1;
2406 s->rate_limit_interval = DEFAULT_RATE_LIMIT_INTERVAL;
2407 s->rate_limit_burst = DEFAULT_RATE_LIMIT_BURST;
2409 s->forward_to_syslog = true;
2410 s->import_proc_kmsg = true;
2412 memset(&s->system_metrics, 0xFF, sizeof(s->system_metrics));
2413 memset(&s->runtime_metrics, 0xFF, sizeof(s->runtime_metrics));
2415 server_parse_config_file(s);
2416 server_parse_proc_cmdline(s);
2418 s->user_journals = hashmap_new(trivial_hash_func, trivial_compare_func);
2419 if (!s->user_journals) {
2420 log_error("Out of memory.");
2424 s->epoll_fd = epoll_create1(EPOLL_CLOEXEC);
2425 if (s->epoll_fd < 0) {
2426 log_error("Failed to create epoll object: %m");
2430 n = sd_listen_fds(true);
2432 log_error("Failed to read listening file descriptors from environment: %s", strerror(-n));
2436 for (fd = SD_LISTEN_FDS_START; fd < SD_LISTEN_FDS_START + n; fd++) {
2438 if (sd_is_socket_unix(fd, SOCK_DGRAM, -1, "/run/systemd/journal/socket", 0) > 0) {
2440 if (s->native_fd >= 0) {
2441 log_error("Too many native sockets passed.");
2447 } else if (sd_is_socket_unix(fd, SOCK_STREAM, 1, "/run/systemd/journal/stdout", 0) > 0) {
2449 if (s->stdout_fd >= 0) {
2450 log_error("Too many stdout sockets passed.");
2456 } else if (sd_is_socket_unix(fd, SOCK_DGRAM, -1, "/dev/log", 0) > 0) {
2458 if (s->syslog_fd >= 0) {
2459 log_error("Too many /dev/log sockets passed.");
2466 log_error("Unknown socket passed.");
2471 r = open_syslog_socket(s);
2475 r = open_native_socket(s);
2479 r = open_stdout_socket(s);
2483 r = open_proc_kmsg(s);
2487 r = system_journal_open(s);
2491 r = open_signalfd(s);
2495 s->rate_limit = journal_rate_limit_new(s->rate_limit_interval, s->rate_limit_burst);
2502 static void server_done(Server *s) {
2506 while (s->stdout_streams)
2507 stdout_stream_free(s->stdout_streams);
2509 if (s->system_journal)
2510 journal_file_close(s->system_journal);
2512 if (s->runtime_journal)
2513 journal_file_close(s->runtime_journal);
2515 while ((f = hashmap_steal_first(s->user_journals)))
2516 journal_file_close(f);
2518 hashmap_free(s->user_journals);
2520 if (s->epoll_fd >= 0)
2521 close_nointr_nofail(s->epoll_fd);
2523 if (s->signal_fd >= 0)
2524 close_nointr_nofail(s->signal_fd);
2526 if (s->syslog_fd >= 0)
2527 close_nointr_nofail(s->syslog_fd);
2529 if (s->native_fd >= 0)
2530 close_nointr_nofail(s->native_fd);
2532 if (s->stdout_fd >= 0)
2533 close_nointr_nofail(s->stdout_fd);
2535 if (s->proc_kmsg_fd >= 0)
2536 close_nointr_nofail(s->proc_kmsg_fd);
2539 journal_rate_limit_free(s->rate_limit);
2544 int main(int argc, char *argv[]) {
2548 /* if (getppid() != 1) { */
2549 /* log_error("This program should be invoked by init only."); */
2550 /* return EXIT_FAILURE; */
2554 log_error("This program does not take arguments.");
2555 return EXIT_FAILURE;
2558 log_set_target(LOG_TARGET_CONSOLE);
2559 log_parse_environment();
2564 r = server_init(&server);
2568 server_vacuum(&server);
2569 server_flush_to_var(&server);
2570 server_flush_proc_kmsg(&server);
2572 log_debug("systemd-journald running as pid %lu", (unsigned long) getpid());
2573 driver_message(&server, SD_MESSAGE_JOURNAL_START, "Journal started");
2577 "STATUS=Processing requests...");
2580 struct epoll_event event;
2582 r = epoll_wait(server.epoll_fd, &event, 1, -1);
2588 log_error("epoll_wait() failed: %m");
2594 r = process_event(&server, &event);
2601 log_debug("systemd-journald stopped as pid %lu", (unsigned long) getpid());
2602 driver_message(&server, SD_MESSAGE_JOURNAL_STOP, "Journal stopped");
2606 "STATUS=Shutting down...");
2608 server_done(&server);
2610 return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;