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>
56 #include <selinux/selinux.h>
59 #define USER_JOURNALS_MAX 1024
60 #define STDOUT_STREAMS_MAX 4096
62 #define DEFAULT_RATE_LIMIT_INTERVAL (10*USEC_PER_SEC)
63 #define DEFAULT_RATE_LIMIT_BURST 200
65 #define RECHECK_AVAILABLE_SPACE_USEC (30*USEC_PER_SEC)
67 #define RECHECK_VAR_AVAILABLE_USEC (30*USEC_PER_SEC)
69 #define N_IOVEC_META_FIELDS 17
71 #define ENTRY_SIZE_MAX (1024*1024*32)
73 typedef enum StdoutStreamState {
74 STDOUT_STREAM_IDENTIFIER,
75 STDOUT_STREAM_PRIORITY,
76 STDOUT_STREAM_LEVEL_PREFIX,
77 STDOUT_STREAM_FORWARD_TO_SYSLOG,
78 STDOUT_STREAM_FORWARD_TO_KMSG,
79 STDOUT_STREAM_FORWARD_TO_CONSOLE,
85 StdoutStreamState state;
94 bool forward_to_syslog:1;
95 bool forward_to_kmsg:1;
96 bool forward_to_console:1;
98 char buffer[LINE_MAX+1];
101 LIST_FIELDS(StdoutStream, stdout_stream);
104 static int server_flush_to_var(Server *s);
106 static uint64_t available_space(Server *s) {
111 uint64_t sum = 0, avail = 0, ss_avail = 0;
117 ts = now(CLOCK_MONOTONIC);
119 if (s->cached_available_space_timestamp + RECHECK_AVAILABLE_SPACE_USEC > ts)
120 return s->cached_available_space;
122 r = sd_id128_get_machine(&machine);
126 if (s->system_journal) {
127 f = "/var/log/journal/";
128 m = &s->system_metrics;
130 f = "/run/log/journal/";
131 m = &s->runtime_metrics;
136 p = strappend(f, sd_id128_to_string(machine, ids));
146 if (fstatvfs(dirfd(d), &ss) < 0)
151 struct dirent buf, *de;
154 k = readdir_r(d, &buf, &de);
163 if (!dirent_is_file_with_suffix(de, ".journal"))
166 if (fstatat(dirfd(d), de->d_name, &st, AT_SYMLINK_NOFOLLOW) < 0)
169 sum += (uint64_t) st.st_blocks * (uint64_t) st.st_blksize;
172 avail = sum >= m->max_use ? 0 : m->max_use - sum;
174 ss_avail = ss.f_bsize * ss.f_bavail;
176 ss_avail = ss_avail < m->keep_free ? 0 : ss_avail - m->keep_free;
178 if (ss_avail < avail)
181 s->cached_available_space = avail;
182 s->cached_available_space_timestamp = ts;
190 static void server_read_file_gid(Server *s) {
191 const char *adm = "adm";
196 if (s->file_gid_valid)
199 r = get_group_creds(&adm, &s->file_gid);
201 log_warning("Failed to resolve 'adm' group: %s", strerror(-r));
203 /* if we couldn't read the gid, then it will be 0, but that's
204 * fine and we shouldn't try to resolve the group again, so
205 * let's just pretend it worked right-away. */
206 s->file_gid_valid = true;
209 static void server_fix_perms(Server *s, JournalFile *f, uid_t uid) {
214 acl_permset_t permset;
219 server_read_file_gid(s);
221 r = fchmod_and_fchown(f->fd, 0640, 0, s->file_gid);
223 log_warning("Failed to fix access mode/rights on %s, ignoring: %s", f->path, strerror(-r));
229 acl = acl_get_fd(f->fd);
231 log_warning("Failed to read ACL on %s, ignoring: %m", f->path);
235 r = acl_find_uid(acl, uid, &entry);
238 if (acl_create_entry(&acl, &entry) < 0 ||
239 acl_set_tag_type(entry, ACL_USER) < 0 ||
240 acl_set_qualifier(entry, &uid) < 0) {
241 log_warning("Failed to patch ACL on %s, ignoring: %m", f->path);
246 if (acl_get_permset(entry, &permset) < 0 ||
247 acl_add_perm(permset, ACL_READ) < 0 ||
248 acl_calc_mask(&acl) < 0) {
249 log_warning("Failed to patch ACL on %s, ignoring: %m", f->path);
253 if (acl_set_fd(f->fd, acl) < 0)
254 log_warning("Failed to set ACL on %s, ignoring: %m", f->path);
261 static JournalFile* find_journal(Server *s, uid_t uid) {
270 /* We split up user logs only on /var, not on /run. If the
271 * runtime file is open, we write to it exclusively, in order
272 * to guarantee proper order as soon as we flush /run to
273 * /var and close the runtime file. */
275 if (s->runtime_journal)
276 return s->runtime_journal;
279 return s->system_journal;
281 r = sd_id128_get_machine(&machine);
283 return s->system_journal;
285 f = hashmap_get(s->user_journals, UINT32_TO_PTR(uid));
289 if (asprintf(&p, "/var/log/journal/%s/user-%lu.journal", sd_id128_to_string(machine, ids), (unsigned long) uid) < 0)
290 return s->system_journal;
292 while (hashmap_size(s->user_journals) >= USER_JOURNALS_MAX) {
293 /* Too many open? Then let's close one */
294 f = hashmap_steal_first(s->user_journals);
296 journal_file_close(f);
299 r = journal_file_open(p, O_RDWR|O_CREAT, 0640, s->system_journal, &f);
303 return s->system_journal;
305 server_fix_perms(s, f, uid);
306 f->metrics = s->system_metrics;
307 f->compress = s->compress;
309 r = hashmap_put(s->user_journals, UINT32_TO_PTR(uid), f);
311 journal_file_close(f);
312 return s->system_journal;
318 static void server_rotate(Server *s) {
324 log_info("Rotating...");
326 if (s->runtime_journal) {
327 r = journal_file_rotate(&s->runtime_journal);
329 log_error("Failed to rotate %s: %s", s->runtime_journal->path, strerror(-r));
332 if (s->system_journal) {
333 r = journal_file_rotate(&s->system_journal);
335 log_error("Failed to rotate %s: %s", s->system_journal->path, strerror(-r));
338 HASHMAP_FOREACH_KEY(f, k, s->user_journals, i) {
339 r = journal_file_rotate(&f);
341 log_error("Failed to rotate %s: %s", f->path, strerror(-r));
343 hashmap_replace(s->user_journals, k, f);
347 static void server_vacuum(Server *s) {
353 log_info("Vacuuming...");
355 r = sd_id128_get_machine(&machine);
357 log_error("Failed to get machine ID: %s", strerror(-r));
361 sd_id128_to_string(machine, ids);
363 if (s->system_journal) {
364 if (asprintf(&p, "/var/log/journal/%s", ids) < 0) {
365 log_error("Out of memory.");
369 r = journal_directory_vacuum(p, s->system_metrics.max_use, s->system_metrics.keep_free);
370 if (r < 0 && r != -ENOENT)
371 log_error("Failed to vacuum %s: %s", p, strerror(-r));
376 if (s->runtime_journal) {
377 if (asprintf(&p, "/run/log/journal/%s", ids) < 0) {
378 log_error("Out of memory.");
382 r = journal_directory_vacuum(p, s->runtime_metrics.max_use, s->runtime_metrics.keep_free);
383 if (r < 0 && r != -ENOENT)
384 log_error("Failed to vacuum %s: %s", p, strerror(-r));
388 s->cached_available_space_timestamp = 0;
391 static char *shortened_cgroup_path(pid_t pid) {
393 char *process_path, *init_path, *path;
397 r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, pid, &process_path);
401 r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, 1, &init_path);
407 if (endswith(init_path, "/system"))
408 init_path[strlen(init_path) - 7] = 0;
409 else if (streq(init_path, "/"))
412 if (startswith(process_path, init_path)) {
415 p = strdup(process_path + strlen(init_path));
433 static void dispatch_message_real(Server *s,
434 struct iovec *iovec, unsigned n, unsigned m,
436 struct timeval *tv) {
438 char *pid = NULL, *uid = NULL, *gid = NULL,
439 *source_time = NULL, *boot_id = NULL, *machine_id = NULL,
440 *comm = NULL, *cmdline = NULL, *hostname = NULL,
441 *audit_session = NULL, *audit_loginuid = NULL,
442 *exe = NULL, *cgroup = NULL, *session = NULL,
443 *owner_uid = NULL, *unit = NULL, *selinux_context = NULL;
449 uid_t loginuid = 0, realuid = 0;
451 bool vacuumed = false;
456 assert(n + N_IOVEC_META_FIELDS <= m);
462 security_context_t con;
465 realuid = ucred->uid;
467 if (asprintf(&pid, "_PID=%lu", (unsigned long) ucred->pid) >= 0)
468 IOVEC_SET_STRING(iovec[n++], pid);
470 if (asprintf(&uid, "_UID=%lu", (unsigned long) ucred->uid) >= 0)
471 IOVEC_SET_STRING(iovec[n++], uid);
473 if (asprintf(&gid, "_GID=%lu", (unsigned long) ucred->gid) >= 0)
474 IOVEC_SET_STRING(iovec[n++], gid);
476 r = get_process_comm(ucred->pid, &t);
478 comm = strappend("_COMM=", t);
482 IOVEC_SET_STRING(iovec[n++], comm);
485 r = get_process_exe(ucred->pid, &t);
487 exe = strappend("_EXE=", t);
491 IOVEC_SET_STRING(iovec[n++], exe);
494 r = get_process_cmdline(ucred->pid, LINE_MAX, false, &t);
496 cmdline = strappend("_CMDLINE=", t);
500 IOVEC_SET_STRING(iovec[n++], cmdline);
503 r = audit_session_from_pid(ucred->pid, &audit);
505 if (asprintf(&audit_session, "_AUDIT_SESSION=%lu", (unsigned long) audit) >= 0)
506 IOVEC_SET_STRING(iovec[n++], audit_session);
508 r = audit_loginuid_from_pid(ucred->pid, &loginuid);
510 if (asprintf(&audit_loginuid, "_AUDIT_LOGINUID=%lu", (unsigned long) loginuid) >= 0)
511 IOVEC_SET_STRING(iovec[n++], audit_loginuid);
513 t = shortened_cgroup_path(ucred->pid);
515 cgroup = strappend("_SYSTEMD_CGROUP=", t);
519 IOVEC_SET_STRING(iovec[n++], cgroup);
522 if (sd_pid_get_session(ucred->pid, &t) >= 0) {
523 session = strappend("_SYSTEMD_SESSION=", t);
527 IOVEC_SET_STRING(iovec[n++], session);
530 if (sd_pid_get_unit(ucred->pid, &t) >= 0) {
531 unit = strappend("_SYSTEMD_UNIT=", t);
535 IOVEC_SET_STRING(iovec[n++], unit);
538 if (sd_pid_get_owner_uid(ucred->uid, &owner) >= 0)
539 if (asprintf(&owner_uid, "_SYSTEMD_OWNER_UID=%lu", (unsigned long) owner) >= 0)
540 IOVEC_SET_STRING(iovec[n++], owner_uid);
543 if (getpidcon(ucred->pid, &con) >= 0) {
544 selinux_context = strappend("_SELINUX_CONTEXT=", con);
546 IOVEC_SET_STRING(iovec[n++], selinux_context);
554 if (asprintf(&source_time, "_SOURCE_REALTIME_TIMESTAMP=%llu",
555 (unsigned long long) timeval_load(tv)) >= 0)
556 IOVEC_SET_STRING(iovec[n++], source_time);
559 /* Note that strictly speaking storing the boot id here is
560 * redundant since the entry includes this in-line
561 * anyway. However, we need this indexed, too. */
562 r = sd_id128_get_boot(&id);
564 if (asprintf(&boot_id, "_BOOT_ID=%s", sd_id128_to_string(id, idbuf)) >= 0)
565 IOVEC_SET_STRING(iovec[n++], boot_id);
567 r = sd_id128_get_machine(&id);
569 if (asprintf(&machine_id, "_MACHINE_ID=%s", sd_id128_to_string(id, idbuf)) >= 0)
570 IOVEC_SET_STRING(iovec[n++], machine_id);
572 t = gethostname_malloc();
574 hostname = strappend("_HOSTNAME=", t);
577 IOVEC_SET_STRING(iovec[n++], hostname);
582 server_flush_to_var(s);
585 f = find_journal(s, realuid == 0 ? 0 : loginuid);
587 log_warning("Dropping message, as we can't find a place to store the data.");
589 r = journal_file_append_entry(f, NULL, iovec, n, &s->seqnum, NULL, NULL);
591 if (r == -E2BIG && !vacuumed) {
592 log_info("Allocation limit reached.");
598 log_info("Retrying write.");
603 log_error("Failed to write entry, ignoring: %s", strerror(-r));
617 free(audit_loginuid);
622 free(selinux_context);
625 static void driver_message(Server *s, sd_id128_t message_id, const char *format, ...) {
626 char mid[11 + 32 + 1];
627 char buffer[16 + LINE_MAX + 1];
628 struct iovec iovec[N_IOVEC_META_FIELDS + 4];
636 IOVEC_SET_STRING(iovec[n++], "PRIORITY=5");
637 IOVEC_SET_STRING(iovec[n++], "_TRANSPORT=driver");
639 memcpy(buffer, "MESSAGE=", 8);
640 va_start(ap, format);
641 vsnprintf(buffer + 8, sizeof(buffer) - 8, format, ap);
643 char_array_0(buffer);
644 IOVEC_SET_STRING(iovec[n++], buffer);
646 snprintf(mid, sizeof(mid), "MESSAGE_ID=" SD_ID128_FORMAT_STR, SD_ID128_FORMAT_VAL(message_id));
648 IOVEC_SET_STRING(iovec[n++], mid);
651 ucred.pid = getpid();
652 ucred.uid = getuid();
653 ucred.gid = getgid();
655 dispatch_message_real(s, iovec, n, ELEMENTSOF(iovec), &ucred, NULL);
658 static void dispatch_message(Server *s,
659 struct iovec *iovec, unsigned n, unsigned m,
664 char *path = NULL, *c;
667 assert(iovec || n == 0);
675 path = shortened_cgroup_path(ucred->pid);
679 /* example: /user/lennart/3/foobar
680 * /system/dbus.service/foobar
682 * So let's cut of everything past the third /, since that is
683 * wher user directories start */
685 c = strchr(path, '/');
687 c = strchr(c+1, '/');
689 c = strchr(c+1, '/');
695 rl = journal_rate_limit_test(s->rate_limit, path, priority & LOG_PRIMASK, available_space(s));
702 /* Write a suppression message if we suppressed something */
704 driver_message(s, SD_MESSAGE_JOURNAL_DROPPED, "Suppressed %u messages from %s", rl - 1, path);
709 dispatch_message_real(s, iovec, n, m, ucred, tv);
712 static void forward_syslog_iovec(Server *s, const struct iovec *iovec, unsigned n_iovec, struct ucred *ucred, struct timeval *tv) {
713 struct msghdr msghdr;
714 struct cmsghdr *cmsg;
716 struct cmsghdr cmsghdr;
717 uint8_t buf[CMSG_SPACE(sizeof(struct ucred))];
719 union sockaddr_union sa;
726 msghdr.msg_iov = (struct iovec*) iovec;
727 msghdr.msg_iovlen = n_iovec;
730 sa.un.sun_family = AF_UNIX;
731 strncpy(sa.un.sun_path, "/run/systemd/journal/syslog", sizeof(sa.un.sun_path));
732 msghdr.msg_name = &sa;
733 msghdr.msg_namelen = offsetof(union sockaddr_union, un.sun_path) + strlen(sa.un.sun_path);
737 msghdr.msg_control = &control;
738 msghdr.msg_controllen = sizeof(control);
740 cmsg = CMSG_FIRSTHDR(&msghdr);
741 cmsg->cmsg_level = SOL_SOCKET;
742 cmsg->cmsg_type = SCM_CREDENTIALS;
743 cmsg->cmsg_len = CMSG_LEN(sizeof(struct ucred));
744 memcpy(CMSG_DATA(cmsg), ucred, sizeof(struct ucred));
745 msghdr.msg_controllen = cmsg->cmsg_len;
748 /* Forward the syslog message we received via /dev/log to
749 * /run/systemd/syslog. Unfortunately we currently can't set
750 * the SO_TIMESTAMP auxiliary data, and hence we don't. */
752 if (sendmsg(s->syslog_fd, &msghdr, MSG_NOSIGNAL) >= 0)
755 /* The socket is full? I guess the syslog implementation is
756 * too slow, and we shouldn't wait for that... */
760 if (ucred && errno == ESRCH) {
763 /* Hmm, presumably the sender process vanished
764 * by now, so let's fix it as good as we
769 memcpy(CMSG_DATA(cmsg), &u, sizeof(struct ucred));
771 if (sendmsg(s->syslog_fd, &msghdr, MSG_NOSIGNAL) >= 0)
778 log_debug("Failed to forward syslog message: %m");
781 static void forward_syslog_raw(Server *s, const char *buffer, struct ucred *ucred, struct timeval *tv) {
787 IOVEC_SET_STRING(iovec, buffer);
788 forward_syslog_iovec(s, &iovec, 1, ucred, tv);
791 static void forward_syslog(Server *s, int priority, const char *identifier, const char *message, struct ucred *ucred, struct timeval *tv) {
792 struct iovec iovec[5];
793 char header_priority[6], header_time[64], header_pid[16];
797 char *ident_buf = NULL;
800 assert(priority >= 0);
801 assert(priority <= 999);
804 /* First: priority field */
805 snprintf(header_priority, sizeof(header_priority), "<%i>", priority);
806 char_array_0(header_priority);
807 IOVEC_SET_STRING(iovec[n++], header_priority);
809 /* Second: timestamp */
810 t = tv ? tv->tv_sec : ((time_t) (now(CLOCK_REALTIME) / USEC_PER_SEC));
814 if (strftime(header_time, sizeof(header_time), "%h %e %T ", tm) <= 0)
816 IOVEC_SET_STRING(iovec[n++], header_time);
818 /* Third: identifier and PID */
821 get_process_comm(ucred->pid, &ident_buf);
822 identifier = ident_buf;
825 snprintf(header_pid, sizeof(header_pid), "[%lu]: ", (unsigned long) ucred->pid);
826 char_array_0(header_pid);
829 IOVEC_SET_STRING(iovec[n++], identifier);
831 IOVEC_SET_STRING(iovec[n++], header_pid);
832 } else if (identifier) {
833 IOVEC_SET_STRING(iovec[n++], identifier);
834 IOVEC_SET_STRING(iovec[n++], ": ");
837 /* Fourth: message */
838 IOVEC_SET_STRING(iovec[n++], message);
840 forward_syslog_iovec(s, iovec, n, ucred, tv);
845 static int fixup_priority(int priority) {
847 if ((priority & LOG_FACMASK) == 0)
848 return (priority & LOG_PRIMASK) | LOG_USER;
853 static void forward_kmsg(Server *s, int priority, const char *identifier, const char *message, struct ucred *ucred) {
854 struct iovec iovec[5];
855 char header_priority[6], header_pid[16];
857 char *ident_buf = NULL;
861 assert(priority >= 0);
862 assert(priority <= 999);
865 /* Never allow messages with kernel facility to be written to
866 * kmsg, regardless where the data comes from. */
867 priority = fixup_priority(priority);
869 /* First: priority field */
870 snprintf(header_priority, sizeof(header_priority), "<%i>", priority);
871 char_array_0(header_priority);
872 IOVEC_SET_STRING(iovec[n++], header_priority);
874 /* Second: 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++], ": ");
893 /* Fourth: message */
894 IOVEC_SET_STRING(iovec[n++], message);
895 IOVEC_SET_STRING(iovec[n++], "\n");
897 fd = open("/dev/kmsg", O_WRONLY|O_NOCTTY|O_CLOEXEC);
899 log_debug("Failed to open /dev/kmsg for logging: %s", strerror(errno));
903 if (writev(fd, iovec, n) < 0)
904 log_debug("Failed to write to /dev/kmsg for logging: %s", strerror(errno));
906 close_nointr_nofail(fd);
912 static void forward_console(Server *s, const char *identifier, const char *message, struct ucred *ucred) {
913 struct iovec iovec[4];
916 char *ident_buf = NULL;
921 /* First: identifier and PID */
924 get_process_comm(ucred->pid, &ident_buf);
925 identifier = ident_buf;
928 snprintf(header_pid, sizeof(header_pid), "[%lu]: ", (unsigned long) ucred->pid);
929 char_array_0(header_pid);
932 IOVEC_SET_STRING(iovec[n++], identifier);
934 IOVEC_SET_STRING(iovec[n++], header_pid);
935 } else if (identifier) {
936 IOVEC_SET_STRING(iovec[n++], identifier);
937 IOVEC_SET_STRING(iovec[n++], ": ");
941 IOVEC_SET_STRING(iovec[n++], message);
942 IOVEC_SET_STRING(iovec[n++], "\n");
944 fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC);
946 log_debug("Failed to open /dev/console for logging: %s", strerror(errno));
950 if (writev(fd, iovec, n) < 0)
951 log_debug("Failed to write to /dev/console for logging: %s", strerror(errno));
953 close_nointr_nofail(fd);
959 static void read_identifier(const char **buf, char **identifier, char **pid) {
970 p += strspn(p, WHITESPACE);
971 l = strcspn(p, WHITESPACE);
986 t = strndup(p+k+1, l-k-2);
1006 *buf += strspn(*buf, WHITESPACE);
1009 static void process_syslog_message(Server *s, const char *buf, struct ucred *ucred, struct timeval *tv) {
1010 char *message = NULL, *syslog_priority = NULL, *syslog_facility = NULL, *syslog_identifier = NULL, *syslog_pid = NULL;
1011 struct iovec iovec[N_IOVEC_META_FIELDS + 6];
1013 int priority = LOG_USER | LOG_INFO;
1014 char *identifier = NULL, *pid = NULL;
1019 if (s->forward_to_syslog)
1020 forward_syslog_raw(s, buf, ucred, tv);
1022 parse_syslog_priority((char**) &buf, &priority);
1023 skip_syslog_date((char**) &buf);
1024 read_identifier(&buf, &identifier, &pid);
1026 if (s->forward_to_kmsg)
1027 forward_kmsg(s, priority, identifier, buf, ucred);
1029 if (s->forward_to_console)
1030 forward_console(s, identifier, buf, ucred);
1032 IOVEC_SET_STRING(iovec[n++], "_TRANSPORT=syslog");
1034 if (asprintf(&syslog_priority, "PRIORITY=%i", priority & LOG_PRIMASK) >= 0)
1035 IOVEC_SET_STRING(iovec[n++], syslog_priority);
1037 if (priority & LOG_FACMASK)
1038 if (asprintf(&syslog_facility, "SYSLOG_FACILITY=%i", LOG_FAC(priority)) >= 0)
1039 IOVEC_SET_STRING(iovec[n++], syslog_facility);
1042 syslog_identifier = strappend("SYSLOG_IDENTIFIER=", identifier);
1043 if (syslog_identifier)
1044 IOVEC_SET_STRING(iovec[n++], syslog_identifier);
1048 syslog_pid = strappend("SYSLOG_PID=", pid);
1050 IOVEC_SET_STRING(iovec[n++], syslog_pid);
1053 message = strappend("MESSAGE=", buf);
1055 IOVEC_SET_STRING(iovec[n++], message);
1057 dispatch_message(s, iovec, n, ELEMENTSOF(iovec), ucred, tv, priority);
1062 free(syslog_priority);
1063 free(syslog_facility);
1064 free(syslog_identifier);
1067 static bool valid_user_field(const char *p, size_t l) {
1070 /* We kinda enforce POSIX syntax recommendations for
1071 environment variables here, but make a couple of additional
1074 http://pubs.opengroup.org/onlinepubs/000095399/basedefs/xbd_chap08.html */
1076 /* No empty field names */
1080 /* Don't allow names longer than 64 chars */
1084 /* Variables starting with an underscore are protected */
1088 /* Don't allow digits as first character */
1089 if (p[0] >= '0' && p[0] <= '9')
1092 /* Only allow A-Z0-9 and '_' */
1093 for (a = p; a < p + l; a++)
1094 if (!((*a >= 'A' && *a <= 'Z') ||
1095 (*a >= '0' && *a <= '9') ||
1102 static void process_native_message(Server *s, const void *buffer, size_t buffer_size, struct ucred *ucred, struct timeval *tv) {
1103 struct iovec *iovec = NULL;
1104 unsigned n = 0, m = 0, j, tn = (unsigned) -1;
1107 int priority = LOG_INFO;
1108 char *identifier = NULL, *message = NULL;
1111 assert(buffer || n == 0);
1114 remaining = buffer_size;
1116 while (remaining > 0) {
1119 e = memchr(p, '\n', remaining);
1122 /* Trailing noise, let's ignore it, and flush what we collected */
1123 log_debug("Received message with trailing noise, ignoring.");
1128 /* Entry separator */
1129 dispatch_message(s, iovec, n, m, ucred, tv, priority);
1131 priority = LOG_INFO;
1138 if (*p == '.' || *p == '#') {
1139 /* Ignore control commands for now, and
1141 remaining -= (e - p) + 1;
1146 /* A property follows */
1148 if (n+N_IOVEC_META_FIELDS >= m) {
1152 u = MAX((n+N_IOVEC_META_FIELDS+1) * 2U, 4U);
1153 c = realloc(iovec, u * sizeof(struct iovec));
1155 log_error("Out of memory");
1163 q = memchr(p, '=', e - p);
1165 if (valid_user_field(p, q - p)) {
1170 /* If the field name starts with an
1171 * underscore, skip the variable,
1172 * since that indidates a trusted
1174 iovec[n].iov_base = (char*) p;
1175 iovec[n].iov_len = l;
1178 /* We need to determine the priority
1179 * of this entry for the rate limiting
1182 memcmp(p, "PRIORITY=", 9) == 0 &&
1183 p[9] >= '0' && p[9] <= '9')
1184 priority = (priority & LOG_FACMASK) | (p[9] - '0');
1187 memcmp(p, "SYSLOG_FACILITY=", 16) == 0 &&
1188 p[16] >= '0' && p[16] <= '9')
1189 priority = (priority & LOG_PRIMASK) | ((p[16] - '0') << 3);
1192 memcmp(p, "SYSLOG_FACILITY=", 16) == 0 &&
1193 p[16] >= '0' && p[16] <= '9' &&
1194 p[17] >= '0' && p[17] <= '9')
1195 priority = (priority & LOG_PRIMASK) | (((p[16] - '0')*10 + (p[17] - '0')) << 3);
1198 memcmp(p, "SYSLOG_IDENTIFIER=", 11) == 0) {
1201 t = strndup(p + 11, l - 11);
1206 } else if (l >= 8 &&
1207 memcmp(p, "MESSAGE=", 8) == 0) {
1210 t = strndup(p + 8, l - 8);
1218 remaining -= (e - p) + 1;
1225 if (remaining < e - p + 1 + sizeof(uint64_t) + 1) {
1226 log_debug("Failed to parse message, ignoring.");
1230 memcpy(&l, e + 1, sizeof(uint64_t));
1233 if (remaining < e - p + 1 + sizeof(uint64_t) + l + 1 ||
1234 e[1+sizeof(uint64_t)+l] != '\n') {
1235 log_debug("Failed to parse message, ignoring.");
1239 k = malloc((e - p) + 1 + l);
1241 log_error("Out of memory");
1245 memcpy(k, p, e - p);
1247 memcpy(k + (e - p) + 1, e + 1 + sizeof(uint64_t), l);
1249 if (valid_user_field(p, e - p)) {
1250 iovec[n].iov_base = k;
1251 iovec[n].iov_len = (e - p) + 1 + l;
1256 remaining -= (e - p) + 1 + sizeof(uint64_t) + l + 1;
1257 p = e + 1 + sizeof(uint64_t) + l + 1;
1265 IOVEC_SET_STRING(iovec[tn], "_TRANSPORT=journal");
1268 if (s->forward_to_syslog)
1269 forward_syslog(s, priority, identifier, message, ucred, tv);
1271 if (s->forward_to_kmsg)
1272 forward_kmsg(s, priority, identifier, message, ucred);
1274 if (s->forward_to_console)
1275 forward_console(s, identifier, message, ucred);
1278 dispatch_message(s, iovec, n, m, ucred, tv, priority);
1281 for (j = 0; j < n; j++) {
1285 if (iovec[j].iov_base < buffer ||
1286 (const uint8_t*) iovec[j].iov_base >= (const uint8_t*) buffer + buffer_size)
1287 free(iovec[j].iov_base);
1294 static void process_native_file(Server *s, int fd, struct ucred *ucred, struct timeval *tv) {
1302 /* Data is in the passed file, since it didn't fit in a
1303 * datagram. We can't map the file here, since clients might
1304 * then truncate it and trigger a SIGBUS for us. So let's
1305 * stupidly read it */
1307 if (fstat(fd, &st) < 0) {
1308 log_error("Failed to stat passed file, ignoring: %m");
1312 if (!S_ISREG(st.st_mode)) {
1313 log_error("File passed is not regular. Ignoring.");
1317 if (st.st_size <= 0)
1320 if (st.st_size > ENTRY_SIZE_MAX) {
1321 log_error("File passed too large. Ignoring.");
1325 p = malloc(st.st_size);
1327 log_error("Out of memory");
1331 n = pread(fd, p, st.st_size, 0);
1333 log_error("Failed to read file, ignoring: %s", strerror(-n));
1335 process_native_message(s, p, n, ucred, tv);
1340 static int stdout_stream_log(StdoutStream *s, const char *p) {
1341 struct iovec iovec[N_IOVEC_META_FIELDS + 5];
1342 char *message = NULL, *syslog_priority = NULL, *syslog_facility = NULL, *syslog_identifier = NULL;
1352 priority = s->priority;
1354 if (s->level_prefix)
1355 parse_syslog_priority((char**) &p, &priority);
1357 if (s->forward_to_syslog || s->server->forward_to_syslog)
1358 forward_syslog(s->server, fixup_priority(priority), s->identifier, p, &s->ucred, NULL);
1360 if (s->forward_to_kmsg || s->server->forward_to_kmsg)
1361 forward_kmsg(s->server, priority, s->identifier, p, &s->ucred);
1363 if (s->forward_to_console || s->server->forward_to_console)
1364 forward_console(s->server, s->identifier, p, &s->ucred);
1366 IOVEC_SET_STRING(iovec[n++], "_TRANSPORT=stdout");
1368 if (asprintf(&syslog_priority, "PRIORITY=%i", priority & LOG_PRIMASK) >= 0)
1369 IOVEC_SET_STRING(iovec[n++], syslog_priority);
1371 if (priority & LOG_FACMASK)
1372 if (asprintf(&syslog_facility, "SYSLOG_FACILITY=%i", LOG_FAC(priority)) >= 0)
1373 IOVEC_SET_STRING(iovec[n++], syslog_facility);
1375 if (s->identifier) {
1376 syslog_identifier = strappend("SYSLOG_IDENTIFIER=", s->identifier);
1377 if (syslog_identifier)
1378 IOVEC_SET_STRING(iovec[n++], syslog_identifier);
1381 message = strappend("MESSAGE=", p);
1383 IOVEC_SET_STRING(iovec[n++], message);
1385 dispatch_message(s->server, iovec, n, ELEMENTSOF(iovec), &s->ucred, NULL, priority);
1388 free(syslog_priority);
1389 free(syslog_facility);
1390 free(syslog_identifier);
1395 static int stdout_stream_line(StdoutStream *s, char *p) {
1405 case STDOUT_STREAM_IDENTIFIER:
1407 s->identifier = NULL;
1409 s->identifier = strdup(p);
1410 if (!s->identifier) {
1411 log_error("Out of memory");
1416 s->state = STDOUT_STREAM_PRIORITY;
1419 case STDOUT_STREAM_PRIORITY:
1420 r = safe_atoi(p, &s->priority);
1421 if (r < 0 || s->priority <= 0 || s->priority >= 999) {
1422 log_warning("Failed to parse log priority line.");
1426 s->state = STDOUT_STREAM_LEVEL_PREFIX;
1429 case STDOUT_STREAM_LEVEL_PREFIX:
1430 r = parse_boolean(p);
1432 log_warning("Failed to parse level prefix line.");
1436 s->level_prefix = !!r;
1437 s->state = STDOUT_STREAM_FORWARD_TO_SYSLOG;
1440 case STDOUT_STREAM_FORWARD_TO_SYSLOG:
1441 r = parse_boolean(p);
1443 log_warning("Failed to parse forward to syslog line.");
1447 s->forward_to_syslog = !!r;
1448 s->state = STDOUT_STREAM_FORWARD_TO_KMSG;
1451 case STDOUT_STREAM_FORWARD_TO_KMSG:
1452 r = parse_boolean(p);
1454 log_warning("Failed to parse copy to kmsg line.");
1458 s->forward_to_kmsg = !!r;
1459 s->state = STDOUT_STREAM_FORWARD_TO_CONSOLE;
1462 case STDOUT_STREAM_FORWARD_TO_CONSOLE:
1463 r = parse_boolean(p);
1465 log_warning("Failed to parse copy to console line.");
1469 s->forward_to_console = !!r;
1470 s->state = STDOUT_STREAM_RUNNING;
1473 case STDOUT_STREAM_RUNNING:
1474 return stdout_stream_log(s, p);
1477 assert_not_reached("Unknown stream state");
1480 static int stdout_stream_scan(StdoutStream *s, bool force_flush) {
1488 remaining = s->length;
1493 end = memchr(p, '\n', remaining);
1496 else if (remaining >= sizeof(s->buffer) - 1) {
1497 end = p + sizeof(s->buffer) - 1;
1504 r = stdout_stream_line(s, p);
1512 if (force_flush && remaining > 0) {
1514 r = stdout_stream_line(s, p);
1522 if (p > s->buffer) {
1523 memmove(s->buffer, p, remaining);
1524 s->length = remaining;
1530 static int stdout_stream_process(StdoutStream *s) {
1536 l = read(s->fd, s->buffer+s->length, sizeof(s->buffer)-1-s->length);
1539 if (errno == EAGAIN)
1542 log_warning("Failed to read from stream: %m");
1547 r = stdout_stream_scan(s, true);
1555 r = stdout_stream_scan(s, false);
1563 static void stdout_stream_free(StdoutStream *s) {
1567 assert(s->server->n_stdout_streams > 0);
1568 s->server->n_stdout_streams --;
1569 LIST_REMOVE(StdoutStream, stdout_stream, s->server->stdout_streams, s);
1574 epoll_ctl(s->server->epoll_fd, EPOLL_CTL_DEL, s->fd, NULL);
1576 close_nointr_nofail(s->fd);
1579 free(s->identifier);
1583 static int stdout_stream_new(Server *s) {
1584 StdoutStream *stream;
1587 struct epoll_event ev;
1591 fd = accept4(s->stdout_fd, NULL, NULL, SOCK_NONBLOCK|SOCK_CLOEXEC);
1593 if (errno == EAGAIN)
1596 log_error("Failed to accept stdout connection: %m");
1600 if (s->n_stdout_streams >= STDOUT_STREAMS_MAX) {
1601 log_warning("Too many stdout streams, refusing connection.");
1602 close_nointr_nofail(fd);
1606 stream = new0(StdoutStream, 1);
1608 log_error("Out of memory.");
1609 close_nointr_nofail(fd);
1615 len = sizeof(stream->ucred);
1616 if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &stream->ucred, &len) < 0) {
1617 log_error("Failed to determine peer credentials: %m");
1622 if (shutdown(fd, SHUT_WR) < 0) {
1623 log_error("Failed to shutdown writing side of socket: %m");
1629 ev.data.ptr = stream;
1630 ev.events = EPOLLIN;
1631 if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0) {
1632 log_error("Failed to add stream to event loop: %m");
1638 LIST_PREPEND(StdoutStream, stdout_stream, s->stdout_streams, stream);
1639 s->n_stdout_streams ++;
1644 stdout_stream_free(stream);
1648 static int parse_kernel_timestamp(char **_p, usec_t *t) {
1659 if (strlen(p) < 14 || p[0] != '[' || p[13] != ']' || p[6] != '.')
1664 for (i = 1; i <= 5; i++) {
1670 k = undecchar(p[i]);
1677 for (i = 7; i <= 12; i++) {
1680 k = undecchar(p[i]);
1689 *_p += strspn(*_p, WHITESPACE);
1694 static void proc_kmsg_line(Server *s, const char *p) {
1695 struct iovec iovec[N_IOVEC_META_FIELDS + 7];
1696 char *message = NULL, *syslog_priority = NULL, *syslog_pid = NULL, *syslog_facility = NULL, *syslog_identifier = NULL, *source_time = NULL;
1697 int priority = LOG_KERN | LOG_INFO;
1700 char *identifier = NULL, *pid = NULL;
1708 parse_syslog_priority((char **) &p, &priority);
1710 if (s->forward_to_kmsg && (priority & LOG_FACMASK) != LOG_KERN)
1713 if (parse_kernel_timestamp((char **) &p, &usec) > 0) {
1714 if (asprintf(&source_time, "_SOURCE_MONOTONIC_TIMESTAMP=%llu",
1715 (unsigned long long) usec) >= 0)
1716 IOVEC_SET_STRING(iovec[n++], source_time);
1719 IOVEC_SET_STRING(iovec[n++], "_TRANSPORT=kernel");
1721 if (asprintf(&syslog_priority, "PRIORITY=%i", priority & LOG_PRIMASK) >= 0)
1722 IOVEC_SET_STRING(iovec[n++], syslog_priority);
1724 if ((priority & LOG_FACMASK) == LOG_KERN) {
1726 if (s->forward_to_syslog)
1727 forward_syslog(s, priority, "kernel", p, NULL, NULL);
1729 IOVEC_SET_STRING(iovec[n++], "SYSLOG_IDENTIFIER=kernel");
1731 read_identifier(&p, &identifier, &pid);
1733 if (s->forward_to_syslog)
1734 forward_syslog(s, priority, identifier, p, NULL, NULL);
1737 syslog_identifier = strappend("SYSLOG_IDENTIFIER=", identifier);
1738 if (syslog_identifier)
1739 IOVEC_SET_STRING(iovec[n++], syslog_identifier);
1743 syslog_pid = strappend("SYSLOG_PID=", pid);
1745 IOVEC_SET_STRING(iovec[n++], syslog_pid);
1748 if (asprintf(&syslog_facility, "SYSLOG_FACILITY=%i", LOG_FAC(priority)) >= 0)
1749 IOVEC_SET_STRING(iovec[n++], syslog_facility);
1752 message = strappend("MESSAGE=", p);
1754 IOVEC_SET_STRING(iovec[n++], message);
1756 dispatch_message(s, iovec, n, ELEMENTSOF(iovec), NULL, NULL, priority);
1759 free(syslog_priority);
1760 free(syslog_identifier);
1762 free(syslog_facility);
1768 static void proc_kmsg_scan(Server *s) {
1774 p = s->proc_kmsg_buffer;
1775 remaining = s->proc_kmsg_length;
1780 end = memchr(p, '\n', remaining);
1783 else if (remaining >= sizeof(s->proc_kmsg_buffer) - 1) {
1784 end = p + sizeof(s->proc_kmsg_buffer) - 1;
1791 proc_kmsg_line(s, p);
1797 if (p > s->proc_kmsg_buffer) {
1798 memmove(s->proc_kmsg_buffer, p, remaining);
1799 s->proc_kmsg_length = remaining;
1803 static int system_journal_open(Server *s) {
1809 r = sd_id128_get_machine(&machine);
1813 sd_id128_to_string(machine, ids);
1815 if (!s->system_journal) {
1817 /* First try to create the machine path, but not the prefix */
1818 fn = strappend("/var/log/journal/", ids);
1821 (void) mkdir(fn, 0755);
1824 /* The create the system journal file */
1825 fn = join("/var/log/journal/", ids, "/system.journal", NULL);
1829 r = journal_file_open(fn, O_RDWR|O_CREAT, 0640, NULL, &s->system_journal);
1833 journal_default_metrics(&s->system_metrics, s->system_journal->fd);
1835 s->system_journal->metrics = s->system_metrics;
1836 s->system_journal->compress = s->compress;
1838 server_fix_perms(s, s->system_journal, 0);
1841 if (r != -ENOENT && r != -EROFS)
1842 log_warning("Failed to open system journal: %s", strerror(-r));
1848 if (!s->runtime_journal) {
1850 fn = join("/run/log/journal/", ids, "/system.journal", NULL);
1854 if (s->system_journal) {
1856 /* Try to open the runtime journal, but only
1857 * if it already exists, so that we can flush
1858 * it into the system journal */
1860 r = journal_file_open(fn, O_RDWR, 0640, NULL, &s->runtime_journal);
1865 log_warning("Failed to open runtime journal: %s", strerror(-r));
1872 /* OK, we really need the runtime journal, so create
1873 * it if necessary. */
1875 (void) mkdir_parents(fn, 0755);
1876 r = journal_file_open(fn, O_RDWR|O_CREAT, 0640, NULL, &s->runtime_journal);
1880 log_error("Failed to open runtime journal: %s", strerror(-r));
1885 if (s->runtime_journal) {
1886 journal_default_metrics(&s->runtime_metrics, s->runtime_journal->fd);
1888 s->runtime_journal->metrics = s->runtime_metrics;
1889 s->runtime_journal->compress = s->compress;
1891 server_fix_perms(s, s->runtime_journal, 0);
1898 static int server_flush_to_var(Server *s) {
1899 char path[] = "/run/log/journal/xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
1908 if (!s->runtime_journal)
1911 ts = now(CLOCK_MONOTONIC);
1912 if (s->var_available_timestamp + RECHECK_VAR_AVAILABLE_USEC > ts)
1915 s->var_available_timestamp = ts;
1917 system_journal_open(s);
1919 if (!s->system_journal)
1922 log_info("Flushing to /var...");
1924 r = sd_id128_get_machine(&machine);
1926 log_error("Failed to get machine id: %s", strerror(-r));
1930 r = sd_journal_open(&j, SD_JOURNAL_RUNTIME_ONLY);
1932 log_error("Failed to read runtime journal: %s", strerror(-r));
1936 SD_JOURNAL_FOREACH(j) {
1939 f = j->current_file;
1940 assert(f && f->current_offset > 0);
1942 r = journal_file_move_to_object(f, OBJECT_ENTRY, f->current_offset, &o);
1944 log_error("Can't read entry: %s", strerror(-r));
1948 r = journal_file_copy_entry(f, s->system_journal, o, f->current_offset, NULL, NULL, NULL);
1950 log_info("Allocation limit reached.");
1952 journal_file_post_change(s->system_journal);
1956 r = journal_file_copy_entry(f, s->system_journal, o, f->current_offset, NULL, NULL, NULL);
1960 log_error("Can't write entry: %s", strerror(-r));
1966 journal_file_post_change(s->system_journal);
1968 journal_file_close(s->runtime_journal);
1969 s->runtime_journal = NULL;
1972 sd_id128_to_string(machine, path + 17);
1973 rm_rf(path, false, true, false);
1979 static int server_read_proc_kmsg(Server *s) {
1982 assert(s->proc_kmsg_fd >= 0);
1984 l = read(s->proc_kmsg_fd, s->proc_kmsg_buffer + s->proc_kmsg_length, sizeof(s->proc_kmsg_buffer) - 1 - s->proc_kmsg_length);
1987 if (errno == EAGAIN || errno == EINTR)
1990 log_error("Failed to read from kernel: %m");
1994 s->proc_kmsg_length += l;
2000 static int server_flush_proc_kmsg(Server *s) {
2005 if (s->proc_kmsg_fd < 0)
2008 log_info("Flushing /proc/kmsg...");
2011 r = server_read_proc_kmsg(s);
2022 static int process_event(Server *s, struct epoll_event *ev) {
2025 if (ev->data.fd == s->signal_fd) {
2026 struct signalfd_siginfo sfsi;
2029 if (ev->events != EPOLLIN) {
2030 log_info("Got invalid event from epoll.");
2034 n = read(s->signal_fd, &sfsi, sizeof(sfsi));
2035 if (n != sizeof(sfsi)) {
2040 if (errno == EINTR || errno == EAGAIN)
2046 if (sfsi.ssi_signo == SIGUSR1) {
2047 server_flush_to_var(s);
2051 log_debug("Received SIG%s", signal_to_string(sfsi.ssi_signo));
2054 } else if (ev->data.fd == s->proc_kmsg_fd) {
2057 if (ev->events != EPOLLIN) {
2058 log_info("Got invalid event from epoll.");
2062 r = server_read_proc_kmsg(s);
2068 } else if (ev->data.fd == s->native_fd ||
2069 ev->data.fd == s->syslog_fd) {
2071 if (ev->events != EPOLLIN) {
2072 log_info("Got invalid event from epoll.");
2077 struct msghdr msghdr;
2079 struct ucred *ucred = NULL;
2080 struct timeval *tv = NULL;
2081 struct cmsghdr *cmsg;
2083 struct cmsghdr cmsghdr;
2084 uint8_t buf[CMSG_SPACE(sizeof(struct ucred)) +
2085 CMSG_SPACE(sizeof(struct timeval)) +
2086 CMSG_SPACE(sizeof(int))];
2093 if (ioctl(ev->data.fd, SIOCINQ, &v) < 0) {
2094 log_error("SIOCINQ failed: %m");
2098 if (s->buffer_size < (size_t) v) {
2102 l = MAX(LINE_MAX + (size_t) v, s->buffer_size * 2);
2103 b = realloc(s->buffer, l+1);
2106 log_error("Couldn't increase buffer.");
2115 iovec.iov_base = s->buffer;
2116 iovec.iov_len = s->buffer_size;
2120 msghdr.msg_iov = &iovec;
2121 msghdr.msg_iovlen = 1;
2122 msghdr.msg_control = &control;
2123 msghdr.msg_controllen = sizeof(control);
2125 n = recvmsg(ev->data.fd, &msghdr, MSG_DONTWAIT|MSG_CMSG_CLOEXEC);
2128 if (errno == EINTR || errno == EAGAIN)
2131 log_error("recvmsg() failed: %m");
2135 for (cmsg = CMSG_FIRSTHDR(&msghdr); cmsg; cmsg = CMSG_NXTHDR(&msghdr, cmsg)) {
2137 if (cmsg->cmsg_level == SOL_SOCKET &&
2138 cmsg->cmsg_type == SCM_CREDENTIALS &&
2139 cmsg->cmsg_len == CMSG_LEN(sizeof(struct ucred)))
2140 ucred = (struct ucred*) CMSG_DATA(cmsg);
2141 else if (cmsg->cmsg_level == SOL_SOCKET &&
2142 cmsg->cmsg_type == SO_TIMESTAMP &&
2143 cmsg->cmsg_len == CMSG_LEN(sizeof(struct timeval)))
2144 tv = (struct timeval*) CMSG_DATA(cmsg);
2145 else if (cmsg->cmsg_level == SOL_SOCKET &&
2146 cmsg->cmsg_type == SCM_RIGHTS) {
2147 fds = (int*) CMSG_DATA(cmsg);
2148 n_fds = (cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int);
2152 if (ev->data.fd == s->syslog_fd) {
2155 if (n > 0 && n_fds == 0) {
2156 e = memchr(s->buffer, '\n', n);
2162 process_syslog_message(s, strstrip(s->buffer), ucred, tv);
2163 } else if (n_fds > 0)
2164 log_warning("Got file descriptors via syslog socket. Ignoring.");
2167 if (n > 0 && n_fds == 0)
2168 process_native_message(s, s->buffer, n, ucred, tv);
2169 else if (n == 0 && n_fds == 1)
2170 process_native_file(s, fds[0], ucred, tv);
2172 log_warning("Got too many file descriptors via native socket. Ignoring.");
2175 close_many(fds, n_fds);
2180 } else if (ev->data.fd == s->stdout_fd) {
2182 if (ev->events != EPOLLIN) {
2183 log_info("Got invalid event from epoll.");
2187 stdout_stream_new(s);
2191 StdoutStream *stream;
2193 if ((ev->events|EPOLLIN|EPOLLHUP) != (EPOLLIN|EPOLLHUP)) {
2194 log_info("Got invalid event from epoll.");
2198 /* If it is none of the well-known fds, it must be an
2199 * stdout stream fd. Note that this is a bit ugly here
2200 * (since we rely that none of the well-known fds
2201 * could be interpreted as pointer), but nonetheless
2202 * safe, since the well-known fds would never get an
2203 * fd > 4096, i.e. beyond the first memory page */
2205 stream = ev->data.ptr;
2207 if (stdout_stream_process(stream) <= 0)
2208 stdout_stream_free(stream);
2213 log_error("Unknown event.");
2217 static int open_syslog_socket(Server *s) {
2218 union sockaddr_union sa;
2220 struct epoll_event ev;
2224 if (s->syslog_fd < 0) {
2226 s->syslog_fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
2227 if (s->syslog_fd < 0) {
2228 log_error("socket() failed: %m");
2233 sa.un.sun_family = AF_UNIX;
2234 strncpy(sa.un.sun_path, "/dev/log", sizeof(sa.un.sun_path));
2236 unlink(sa.un.sun_path);
2238 r = bind(s->syslog_fd, &sa.sa, offsetof(union sockaddr_union, un.sun_path) + strlen(sa.un.sun_path));
2240 log_error("bind() failed: %m");
2244 chmod(sa.un.sun_path, 0666);
2246 fd_nonblock(s->syslog_fd, 1);
2249 r = setsockopt(s->syslog_fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one));
2251 log_error("SO_PASSCRED failed: %m");
2256 r = setsockopt(s->syslog_fd, SOL_SOCKET, SO_TIMESTAMP, &one, sizeof(one));
2258 log_error("SO_TIMESTAMP failed: %m");
2263 ev.events = EPOLLIN;
2264 ev.data.fd = s->syslog_fd;
2265 if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->syslog_fd, &ev) < 0) {
2266 log_error("Failed to add syslog server fd to epoll object: %m");
2273 static int open_native_socket(Server*s) {
2274 union sockaddr_union sa;
2276 struct epoll_event ev;
2280 if (s->native_fd < 0) {
2282 s->native_fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
2283 if (s->native_fd < 0) {
2284 log_error("socket() failed: %m");
2289 sa.un.sun_family = AF_UNIX;
2290 strncpy(sa.un.sun_path, "/run/systemd/journal/socket", sizeof(sa.un.sun_path));
2292 unlink(sa.un.sun_path);
2294 r = bind(s->native_fd, &sa.sa, offsetof(union sockaddr_union, un.sun_path) + strlen(sa.un.sun_path));
2296 log_error("bind() failed: %m");
2300 chmod(sa.un.sun_path, 0666);
2302 fd_nonblock(s->native_fd, 1);
2305 r = setsockopt(s->native_fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one));
2307 log_error("SO_PASSCRED failed: %m");
2312 r = setsockopt(s->native_fd, SOL_SOCKET, SO_TIMESTAMP, &one, sizeof(one));
2314 log_error("SO_TIMESTAMP failed: %m");
2319 ev.events = EPOLLIN;
2320 ev.data.fd = s->native_fd;
2321 if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->native_fd, &ev) < 0) {
2322 log_error("Failed to add native server fd to epoll object: %m");
2329 static int open_stdout_socket(Server *s) {
2330 union sockaddr_union sa;
2332 struct epoll_event ev;
2336 if (s->stdout_fd < 0) {
2338 s->stdout_fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
2339 if (s->stdout_fd < 0) {
2340 log_error("socket() failed: %m");
2345 sa.un.sun_family = AF_UNIX;
2346 strncpy(sa.un.sun_path, "/run/systemd/journal/stdout", sizeof(sa.un.sun_path));
2348 unlink(sa.un.sun_path);
2350 r = bind(s->stdout_fd, &sa.sa, offsetof(union sockaddr_union, un.sun_path) + strlen(sa.un.sun_path));
2352 log_error("bind() failed: %m");
2356 chmod(sa.un.sun_path, 0666);
2358 if (listen(s->stdout_fd, SOMAXCONN) < 0) {
2359 log_error("liste() failed: %m");
2363 fd_nonblock(s->stdout_fd, 1);
2366 ev.events = EPOLLIN;
2367 ev.data.fd = s->stdout_fd;
2368 if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->stdout_fd, &ev) < 0) {
2369 log_error("Failed to add stdout server fd to epoll object: %m");
2376 static int open_proc_kmsg(Server *s) {
2377 struct epoll_event ev;
2381 if (!s->import_proc_kmsg)
2385 s->proc_kmsg_fd = open("/proc/kmsg", O_CLOEXEC|O_NONBLOCK|O_NOCTTY);
2386 if (s->proc_kmsg_fd < 0) {
2387 log_warning("Failed to open /proc/kmsg, ignoring: %m");
2392 ev.events = EPOLLIN;
2393 ev.data.fd = s->proc_kmsg_fd;
2394 if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->proc_kmsg_fd, &ev) < 0) {
2395 log_error("Failed to add /proc/kmsg fd to epoll object: %m");
2402 static int open_signalfd(Server *s) {
2404 struct epoll_event ev;
2408 assert_se(sigemptyset(&mask) == 0);
2409 sigset_add_many(&mask, SIGINT, SIGTERM, SIGUSR1, -1);
2410 assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
2412 s->signal_fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC);
2413 if (s->signal_fd < 0) {
2414 log_error("signalfd(): %m");
2419 ev.events = EPOLLIN;
2420 ev.data.fd = s->signal_fd;
2422 if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->signal_fd, &ev) < 0) {
2423 log_error("epoll_ctl(): %m");
2430 static int server_parse_proc_cmdline(Server *s) {
2431 char *line, *w, *state;
2435 if (detect_container(NULL) > 0)
2438 r = read_one_line_file("/proc/cmdline", &line);
2440 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
2444 FOREACH_WORD_QUOTED(w, l, line, state) {
2447 word = strndup(w, l);
2453 if (startswith(word, "systemd_journald.forward_to_syslog=")) {
2454 r = parse_boolean(word + 35);
2456 log_warning("Failed to parse forward to syslog switch %s. Ignoring.", word + 35);
2458 s->forward_to_syslog = r;
2459 } else if (startswith(word, "systemd_journald.forward_to_kmsg=")) {
2460 r = parse_boolean(word + 33);
2462 log_warning("Failed to parse forward to kmsg switch %s. Ignoring.", word + 33);
2464 s->forward_to_kmsg = r;
2465 } else if (startswith(word, "systemd_journald.forward_to_console=")) {
2466 r = parse_boolean(word + 36);
2468 log_warning("Failed to parse forward to console switch %s. Ignoring.", word + 36);
2470 s->forward_to_console = r;
2483 static int server_parse_config_file(Server *s) {
2490 fn = "/etc/systemd/systemd-journald.conf";
2491 f = fopen(fn, "re");
2493 if (errno == ENOENT)
2496 log_warning("Failed to open configuration file %s: %m", fn);
2500 r = config_parse(fn, f, "Journal\0", config_item_perf_lookup, (void*) journald_gperf_lookup, false, s);
2502 log_warning("Failed to parse configuration file: %s", strerror(-r));
2509 static int server_init(Server *s) {
2515 s->syslog_fd = s->native_fd = s->stdout_fd = s->signal_fd = s->epoll_fd = s->proc_kmsg_fd = -1;
2518 s->rate_limit_interval = DEFAULT_RATE_LIMIT_INTERVAL;
2519 s->rate_limit_burst = DEFAULT_RATE_LIMIT_BURST;
2521 s->forward_to_syslog = true;
2522 s->import_proc_kmsg = true;
2524 memset(&s->system_metrics, 0xFF, sizeof(s->system_metrics));
2525 memset(&s->runtime_metrics, 0xFF, sizeof(s->runtime_metrics));
2527 server_parse_config_file(s);
2528 server_parse_proc_cmdline(s);
2530 s->user_journals = hashmap_new(trivial_hash_func, trivial_compare_func);
2531 if (!s->user_journals) {
2532 log_error("Out of memory.");
2536 s->epoll_fd = epoll_create1(EPOLL_CLOEXEC);
2537 if (s->epoll_fd < 0) {
2538 log_error("Failed to create epoll object: %m");
2542 n = sd_listen_fds(true);
2544 log_error("Failed to read listening file descriptors from environment: %s", strerror(-n));
2548 for (fd = SD_LISTEN_FDS_START; fd < SD_LISTEN_FDS_START + n; fd++) {
2550 if (sd_is_socket_unix(fd, SOCK_DGRAM, -1, "/run/systemd/journal/socket", 0) > 0) {
2552 if (s->native_fd >= 0) {
2553 log_error("Too many native sockets passed.");
2559 } else if (sd_is_socket_unix(fd, SOCK_STREAM, 1, "/run/systemd/journal/stdout", 0) > 0) {
2561 if (s->stdout_fd >= 0) {
2562 log_error("Too many stdout sockets passed.");
2568 } else if (sd_is_socket_unix(fd, SOCK_DGRAM, -1, "/dev/log", 0) > 0) {
2570 if (s->syslog_fd >= 0) {
2571 log_error("Too many /dev/log sockets passed.");
2578 log_error("Unknown socket passed.");
2583 r = open_syslog_socket(s);
2587 r = open_native_socket(s);
2591 r = open_stdout_socket(s);
2595 r = open_proc_kmsg(s);
2599 r = system_journal_open(s);
2603 r = open_signalfd(s);
2607 s->rate_limit = journal_rate_limit_new(s->rate_limit_interval, s->rate_limit_burst);
2614 static void server_done(Server *s) {
2618 while (s->stdout_streams)
2619 stdout_stream_free(s->stdout_streams);
2621 if (s->system_journal)
2622 journal_file_close(s->system_journal);
2624 if (s->runtime_journal)
2625 journal_file_close(s->runtime_journal);
2627 while ((f = hashmap_steal_first(s->user_journals)))
2628 journal_file_close(f);
2630 hashmap_free(s->user_journals);
2632 if (s->epoll_fd >= 0)
2633 close_nointr_nofail(s->epoll_fd);
2635 if (s->signal_fd >= 0)
2636 close_nointr_nofail(s->signal_fd);
2638 if (s->syslog_fd >= 0)
2639 close_nointr_nofail(s->syslog_fd);
2641 if (s->native_fd >= 0)
2642 close_nointr_nofail(s->native_fd);
2644 if (s->stdout_fd >= 0)
2645 close_nointr_nofail(s->stdout_fd);
2647 if (s->proc_kmsg_fd >= 0)
2648 close_nointr_nofail(s->proc_kmsg_fd);
2651 journal_rate_limit_free(s->rate_limit);
2656 int main(int argc, char *argv[]) {
2660 /* if (getppid() != 1) { */
2661 /* log_error("This program should be invoked by init only."); */
2662 /* return EXIT_FAILURE; */
2666 log_error("This program does not take arguments.");
2667 return EXIT_FAILURE;
2670 log_set_target(LOG_TARGET_CONSOLE);
2671 log_parse_environment();
2676 r = server_init(&server);
2680 server_vacuum(&server);
2681 server_flush_to_var(&server);
2682 server_flush_proc_kmsg(&server);
2684 log_debug("systemd-journald running as pid %lu", (unsigned long) getpid());
2685 driver_message(&server, SD_MESSAGE_JOURNAL_START, "Journal started");
2689 "STATUS=Processing requests...");
2692 struct epoll_event event;
2694 r = epoll_wait(server.epoll_fd, &event, 1, -1);
2700 log_error("epoll_wait() failed: %m");
2706 r = process_event(&server, &event);
2713 log_debug("systemd-journald stopped as pid %lu", (unsigned long) getpid());
2714 driver_message(&server, SD_MESSAGE_JOURNAL_STOP, "Journal stopped");
2718 "STATUS=Shutting down...");
2720 server_done(&server);
2722 return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;