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 Lesser General Public License as published by
10 the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
18 You should have received a copy of the GNU Lesser General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
22 #include <sys/signalfd.h>
23 #include <sys/ioctl.h>
24 #include <linux/sockios.h>
25 #include <sys/statvfs.h>
27 #include <sys/timerfd.h>
30 #include <systemd/sd-journal.h>
31 #include <systemd/sd-messages.h>
32 #include <systemd/sd-daemon.h>
37 #include "journal-file.h"
38 #include "socket-util.h"
39 #include "cgroup-util.h"
43 #include "conf-parser.h"
44 #include "journal-internal.h"
45 #include "journal-vacuum.h"
46 #include "journal-authenticate.h"
47 #include "journald-server.h"
48 #include "journald-rate-limit.h"
49 #include "journald-kmsg.h"
50 #include "journald-syslog.h"
51 #include "journald-stream.h"
52 #include "journald-console.h"
53 #include "journald-native.h"
57 #include <acl/libacl.h>
62 #include <selinux/selinux.h>
65 #define USER_JOURNALS_MAX 1024
67 #define DEFAULT_SYNC_INTERVAL_USEC (5*USEC_PER_MINUTE)
68 #define DEFAULT_RATE_LIMIT_INTERVAL (10*USEC_PER_SEC)
69 #define DEFAULT_RATE_LIMIT_BURST 200
71 #define RECHECK_AVAILABLE_SPACE_USEC (30*USEC_PER_SEC)
73 static const char* const storage_table[] = {
74 [STORAGE_AUTO] = "auto",
75 [STORAGE_VOLATILE] = "volatile",
76 [STORAGE_PERSISTENT] = "persistent",
77 [STORAGE_NONE] = "none"
80 DEFINE_STRING_TABLE_LOOKUP(storage, Storage);
81 DEFINE_CONFIG_PARSE_ENUM(config_parse_storage, storage, Storage, "Failed to parse storage setting");
83 static const char* const split_mode_table[] = {
84 [SPLIT_NONE] = "none",
86 [SPLIT_LOGIN] = "login"
89 DEFINE_STRING_TABLE_LOOKUP(split_mode, SplitMode);
90 DEFINE_CONFIG_PARSE_ENUM(config_parse_split_mode, split_mode, SplitMode, "Failed to parse split mode setting");
92 static uint64_t available_space(Server *s) {
94 _cleanup_free_ char *p = NULL;
98 uint64_t sum = 0, avail = 0, ss_avail = 0;
100 _cleanup_closedir_ DIR *d = NULL;
104 ts = now(CLOCK_MONOTONIC);
106 if (s->cached_available_space_timestamp + RECHECK_AVAILABLE_SPACE_USEC > ts)
107 return s->cached_available_space;
109 r = sd_id128_get_machine(&machine);
113 if (s->system_journal) {
114 f = "/var/log/journal/";
115 m = &s->system_metrics;
117 f = "/run/log/journal/";
118 m = &s->runtime_metrics;
123 p = strappend(f, sd_id128_to_string(machine, ids));
131 if (fstatvfs(dirfd(d), &ss) < 0)
137 union dirent_storage buf;
139 r = readdir_r(d, &buf.de, &de);
146 if (!endswith(de->d_name, ".journal") &&
147 !endswith(de->d_name, ".journal~"))
150 if (fstatat(dirfd(d), de->d_name, &st, AT_SYMLINK_NOFOLLOW) < 0)
153 if (!S_ISREG(st.st_mode))
156 sum += (uint64_t) st.st_blocks * 512UL;
159 avail = sum >= m->max_use ? 0 : m->max_use - sum;
161 ss_avail = ss.f_bsize * ss.f_bavail;
163 ss_avail = ss_avail < m->keep_free ? 0 : ss_avail - m->keep_free;
165 if (ss_avail < avail)
168 s->cached_available_space = avail;
169 s->cached_available_space_timestamp = ts;
174 static void server_read_file_gid(Server *s) {
175 const char *g = "systemd-journal";
180 if (s->file_gid_valid)
183 r = get_group_creds(&g, &s->file_gid);
185 log_warning("Failed to resolve '%s' group: %s", g, strerror(-r));
187 /* if we couldn't read the gid, then it will be 0, but that's
188 * fine and we shouldn't try to resolve the group again, so
189 * let's just pretend it worked right-away. */
190 s->file_gid_valid = true;
193 void server_fix_perms(Server *s, JournalFile *f, uid_t uid) {
198 acl_permset_t permset;
203 server_read_file_gid(s);
205 r = fchmod_and_fchown(f->fd, 0640, 0, s->file_gid);
207 log_warning("Failed to fix access mode/rights on %s, ignoring: %s", f->path, strerror(-r));
213 acl = acl_get_fd(f->fd);
215 log_warning("Failed to read ACL on %s, ignoring: %m", f->path);
219 r = acl_find_uid(acl, uid, &entry);
222 if (acl_create_entry(&acl, &entry) < 0 ||
223 acl_set_tag_type(entry, ACL_USER) < 0 ||
224 acl_set_qualifier(entry, &uid) < 0) {
225 log_warning("Failed to patch ACL on %s, ignoring: %m", f->path);
230 if (acl_get_permset(entry, &permset) < 0 ||
231 acl_add_perm(permset, ACL_READ) < 0 ||
232 acl_calc_mask(&acl) < 0) {
233 log_warning("Failed to patch ACL on %s, ignoring: %m", f->path);
237 if (acl_set_fd(f->fd, acl) < 0)
238 log_warning("Failed to set ACL on %s, ignoring: %m", f->path);
245 static JournalFile* find_journal(Server *s, uid_t uid) {
253 /* We split up user logs only on /var, not on /run. If the
254 * runtime file is open, we write to it exclusively, in order
255 * to guarantee proper order as soon as we flush /run to
256 * /var and close the runtime file. */
258 if (s->runtime_journal)
259 return s->runtime_journal;
262 return s->system_journal;
264 r = sd_id128_get_machine(&machine);
266 return s->system_journal;
268 f = hashmap_get(s->user_journals, UINT32_TO_PTR(uid));
272 if (asprintf(&p, "/var/log/journal/" SD_ID128_FORMAT_STR "/user-%lu.journal",
273 SD_ID128_FORMAT_VAL(machine), (unsigned long) uid) < 0)
274 return s->system_journal;
276 while (hashmap_size(s->user_journals) >= USER_JOURNALS_MAX) {
277 /* Too many open? Then let's close one */
278 f = hashmap_steal_first(s->user_journals);
280 journal_file_close(f);
283 r = journal_file_open_reliably(p, O_RDWR|O_CREAT, 0640, s->compress, s->seal, &s->system_metrics, s->mmap, s->system_journal, &f);
287 return s->system_journal;
289 server_fix_perms(s, f, uid);
291 r = hashmap_put(s->user_journals, UINT32_TO_PTR(uid), f);
293 journal_file_close(f);
294 return s->system_journal;
300 void server_rotate(Server *s) {
306 log_debug("Rotating...");
308 if (s->runtime_journal) {
309 r = journal_file_rotate(&s->runtime_journal, s->compress, false);
311 if (s->runtime_journal)
312 log_error("Failed to rotate %s: %s", s->runtime_journal->path, strerror(-r));
314 log_error("Failed to create new runtime journal: %s", strerror(-r));
316 server_fix_perms(s, s->runtime_journal, 0);
319 if (s->system_journal) {
320 r = journal_file_rotate(&s->system_journal, s->compress, s->seal);
322 if (s->system_journal)
323 log_error("Failed to rotate %s: %s", s->system_journal->path, strerror(-r));
325 log_error("Failed to create new system journal: %s", strerror(-r));
328 server_fix_perms(s, s->system_journal, 0);
331 HASHMAP_FOREACH_KEY(f, k, s->user_journals, i) {
332 r = journal_file_rotate(&f, s->compress, s->seal);
335 log_error("Failed to rotate %s: %s", f->path, strerror(-r));
337 log_error("Failed to create user journal: %s", strerror(-r));
339 hashmap_replace(s->user_journals, k, f);
340 server_fix_perms(s, f, PTR_TO_UINT32(k));
345 void server_sync(Server *s) {
351 static const struct itimerspec sync_timer_disable = {};
353 if (s->system_journal) {
354 r = journal_file_set_offline(s->system_journal);
356 log_error("Failed to sync system journal: %s", strerror(-r));
359 HASHMAP_FOREACH_KEY(f, k, s->user_journals, i) {
360 r = journal_file_set_offline(f);
362 log_error("Failed to sync user journal: %s", strerror(-r));
365 r = timerfd_settime(s->sync_timer_fd, 0, &sync_timer_disable, NULL);
367 log_error("Failed to disable max timer: %m");
369 s->sync_scheduled = false;
372 void server_vacuum(Server *s) {
378 log_debug("Vacuuming...");
380 s->oldest_file_usec = 0;
382 r = sd_id128_get_machine(&machine);
384 log_error("Failed to get machine ID: %s", strerror(-r));
388 sd_id128_to_string(machine, ids);
390 if (s->system_journal) {
391 p = strappend("/var/log/journal/", ids);
397 r = journal_directory_vacuum(p, s->system_metrics.max_use, s->system_metrics.keep_free, s->max_retention_usec, &s->oldest_file_usec);
398 if (r < 0 && r != -ENOENT)
399 log_error("Failed to vacuum %s: %s", p, strerror(-r));
403 if (s->runtime_journal) {
404 p = strappend("/run/log/journal/", ids);
410 r = journal_directory_vacuum(p, s->runtime_metrics.max_use, s->runtime_metrics.keep_free, s->max_retention_usec, &s->oldest_file_usec);
411 if (r < 0 && r != -ENOENT)
412 log_error("Failed to vacuum %s: %s", p, strerror(-r));
416 s->cached_available_space_timestamp = 0;
419 bool shall_try_append_again(JournalFile *f, int r) {
421 /* -E2BIG Hit configured limit
423 -EDQUOT Quota limit hit
425 -EHOSTDOWN Other machine
426 -EBUSY Unclean shutdown
427 -EPROTONOSUPPORT Unsupported feature
430 -ESHUTDOWN Already archived */
432 if (r == -E2BIG || r == -EFBIG || r == -EDQUOT || r == -ENOSPC)
433 log_debug("%s: Allocation limit reached, rotating.", f->path);
434 else if (r == -EHOSTDOWN)
435 log_info("%s: Journal file from other machine, rotating.", f->path);
436 else if (r == -EBUSY)
437 log_info("%s: Unclean shutdown, rotating.", f->path);
438 else if (r == -EPROTONOSUPPORT)
439 log_info("%s: Unsupported feature, rotating.", f->path);
440 else if (r == -EBADMSG || r == -ENODATA || r == ESHUTDOWN)
441 log_warning("%s: Journal file corrupted, rotating.", f->path);
448 static void write_to_journal(Server *s, uid_t uid, struct iovec *iovec, unsigned n) {
450 bool vacuumed = false;
457 f = find_journal(s, uid);
461 if (journal_file_rotate_suggested(f, s->max_file_usec)) {
462 log_debug("%s: Journal header limits reached or header out-of-date, rotating.", f->path);
467 f = find_journal(s, uid);
472 r = journal_file_append_entry(f, NULL, iovec, n, &s->seqnum, NULL, NULL);
474 server_schedule_sync(s);
478 if (vacuumed || !shall_try_append_again(f, r)) {
479 log_error("Failed to write entry, ignoring: %s", strerror(-r));
486 f = find_journal(s, uid);
490 log_debug("Retrying write.");
491 r = journal_file_append_entry(f, NULL, iovec, n, &s->seqnum, NULL, NULL);
493 log_error("Failed to write entry, ignoring: %s", strerror(-r));
496 static void dispatch_message_real(
498 struct iovec *iovec, unsigned n, unsigned m,
501 const char *label, size_t label_len,
502 const char *unit_id) {
504 char pid[sizeof("_PID=") + DECIMAL_STR_MAX(pid_t)],
505 uid[sizeof("_UID=") + DECIMAL_STR_MAX(uid_t)],
506 gid[sizeof("_GID=") + DECIMAL_STR_MAX(gid_t)],
507 owner_uid[sizeof("_SYSTEMD_OWNER_UID=") + DECIMAL_STR_MAX(uid_t)],
508 source_time[sizeof("_SOURCE_REALTIME_TIMESTAMP=") + DECIMAL_STR_MAX(usec_t)],
509 boot_id[sizeof("_BOOT_ID=") + 32] = "_BOOT_ID=",
510 machine_id[sizeof("_MACHINE_ID=") + 32] = "_MACHINE_ID=";
511 char *comm, *exe, *cmdline, *cgroup, *session, *unit, *hostname;
515 uid_t realuid = 0, owner = 0, journal_uid;
516 bool owner_valid = false;
518 char audit_session[sizeof("_AUDIT_SESSION=") + DECIMAL_STR_MAX(uint32_t)],
519 audit_loginuid[sizeof("_AUDIT_LOGINUID=") + DECIMAL_STR_MAX(uid_t)];
528 assert(n + N_IOVEC_META_FIELDS <= m);
531 realuid = ucred->uid;
533 sprintf(pid, "_PID=%lu", (unsigned long) ucred->pid);
534 IOVEC_SET_STRING(iovec[n++], pid);
536 sprintf(uid, "_UID=%lu", (unsigned long) ucred->uid);
537 IOVEC_SET_STRING(iovec[n++], uid);
539 sprintf(gid, "_GID=%lu", (unsigned long) ucred->gid);
540 IOVEC_SET_STRING(iovec[n++], gid);
542 r = get_process_comm(ucred->pid, &t);
544 comm = strappenda("_COMM=", t);
546 IOVEC_SET_STRING(iovec[n++], comm);
549 r = get_process_exe(ucred->pid, &t);
551 exe = strappenda("_EXE=", t);
553 IOVEC_SET_STRING(iovec[n++], exe);
556 r = get_process_cmdline(ucred->pid, 0, false, &t);
558 cmdline = strappenda("_CMDLINE=", t);
560 IOVEC_SET_STRING(iovec[n++], cmdline);
564 r = audit_session_from_pid(ucred->pid, &audit);
566 sprintf(audit_session, "_AUDIT_SESSION=%lu", (unsigned long) audit);
567 IOVEC_SET_STRING(iovec[n++], audit_session);
570 r = audit_loginuid_from_pid(ucred->pid, &loginuid);
572 sprintf(audit_loginuid, "_AUDIT_LOGINUID=%lu", (unsigned long) loginuid);
573 IOVEC_SET_STRING(iovec[n++], audit_loginuid);
577 r = cg_pid_get_path_shifted(ucred->pid, NULL, &c);
579 cgroup = strappenda("_SYSTEMD_CGROUP=", c);
580 IOVEC_SET_STRING(iovec[n++], cgroup);
582 r = cg_path_get_session(c, &t);
584 session = strappenda("_SYSTEMD_SESSION=", t);
586 IOVEC_SET_STRING(iovec[n++], session);
589 if (cg_path_get_owner_uid(c, &owner) >= 0) {
592 sprintf(owner_uid, "_SYSTEMD_OWNER_UID=%lu", (unsigned long) owner);
593 IOVEC_SET_STRING(iovec[n++], owner_uid);
596 if (cg_path_get_unit(c, &t) >= 0) {
597 unit = strappenda("_SYSTEMD_UNIT=", t);
599 } else if (cg_path_get_user_unit(c, &t) >= 0) {
600 unit = strappenda("_SYSTEMD_USER_UNIT=", t);
602 } else if (unit_id) {
604 unit = strappenda("_SYSTEMD_USER_UNIT=", unit_id);
606 unit = strappenda("_SYSTEMD_UNIT=", unit_id);
611 IOVEC_SET_STRING(iovec[n++], unit);
618 char *selinux_context = alloca(sizeof("_SELINUX_CONTEXT=") + label_len);
620 *((char*) mempcpy(stpcpy(selinux_context, "_SELINUX_CONTEXT="), label, label_len)) = 0;
621 IOVEC_SET_STRING(iovec[n++], selinux_context);
623 security_context_t con;
625 if (getpidcon(ucred->pid, &con) >= 0) {
626 char *selinux_context = strappenda("_SELINUX_CONTEXT=", con);
629 IOVEC_SET_STRING(iovec[n++], selinux_context);
636 sprintf(source_time, "_SOURCE_REALTIME_TIMESTAMP=%llu", (unsigned long long) timeval_load(tv));
637 IOVEC_SET_STRING(iovec[n++], source_time);
640 /* Note that strictly speaking storing the boot id here is
641 * redundant since the entry includes this in-line
642 * anyway. However, we need this indexed, too. */
643 r = sd_id128_get_boot(&id);
645 sd_id128_to_string(id, boot_id + sizeof("_BOOT_ID=") - 1);
646 IOVEC_SET_STRING(iovec[n++], boot_id);
649 r = sd_id128_get_machine(&id);
651 sd_id128_to_string(id, machine_id + sizeof("_MACHINE_ID=") - 1);
652 IOVEC_SET_STRING(iovec[n++], machine_id);
655 t = gethostname_malloc();
657 hostname = strappenda("_HOSTNAME=", t);
659 IOVEC_SET_STRING(iovec[n++], hostname);
664 if (s->split_mode == SPLIT_UID && realuid > 0)
665 /* Split up strictly by any UID */
666 journal_uid = realuid;
667 else if (s->split_mode == SPLIT_LOGIN && realuid > 0 && owner_valid && owner > 0)
668 /* Split up by login UIDs, this avoids creation of
669 * individual journals for system UIDs. We do this
670 * only if the realuid is not root, in order not to
671 * accidentally leak privileged information to the
672 * user that is logged by a privileged process that is
673 * part of an unprivileged session.*/
678 write_to_journal(s, journal_uid, iovec, n);
681 void server_driver_message(Server *s, sd_id128_t message_id, const char *format, ...) {
682 char mid[11 + 32 + 1];
683 char buffer[16 + LINE_MAX + 1];
684 struct iovec iovec[N_IOVEC_META_FIELDS + 4];
687 struct ucred ucred = {};
692 IOVEC_SET_STRING(iovec[n++], "PRIORITY=6");
693 IOVEC_SET_STRING(iovec[n++], "_TRANSPORT=driver");
695 memcpy(buffer, "MESSAGE=", 8);
696 va_start(ap, format);
697 vsnprintf(buffer + 8, sizeof(buffer) - 8, format, ap);
699 char_array_0(buffer);
700 IOVEC_SET_STRING(iovec[n++], buffer);
702 if (!sd_id128_equal(message_id, SD_ID128_NULL)) {
703 snprintf(mid, sizeof(mid), MESSAGE_ID(message_id));
705 IOVEC_SET_STRING(iovec[n++], mid);
708 ucred.pid = getpid();
709 ucred.uid = getuid();
710 ucred.gid = getgid();
712 dispatch_message_real(s, iovec, n, ELEMENTSOF(iovec), &ucred, NULL, NULL, 0, NULL);
715 void server_dispatch_message(
717 struct iovec *iovec, unsigned n, unsigned m,
720 const char *label, size_t label_len,
725 _cleanup_free_ char *path = NULL;
729 assert(iovec || n == 0);
734 if (LOG_PRI(priority) > s->max_level_store)
740 r = cg_pid_get_path_shifted(ucred->pid, NULL, &path);
744 /* example: /user/lennart/3/foobar
745 * /system/dbus.service/foobar
747 * So let's cut of everything past the third /, since that is
748 * where user directories start */
750 c = strchr(path, '/');
752 c = strchr(c+1, '/');
754 c = strchr(c+1, '/');
760 rl = journal_rate_limit_test(s->rate_limit, path,
761 priority & LOG_PRIMASK, available_space(s));
766 /* Write a suppression message if we suppressed something */
768 server_driver_message(s, SD_MESSAGE_JOURNAL_DROPPED,
769 "Suppressed %u messages from %s", rl - 1, path);
772 dispatch_message_real(s, iovec, n, m, ucred, tv, label, label_len, unit_id);
776 static int system_journal_open(Server *s) {
782 r = sd_id128_get_machine(&machine);
786 sd_id128_to_string(machine, ids);
788 if (!s->system_journal &&
789 (s->storage == STORAGE_PERSISTENT || s->storage == STORAGE_AUTO) &&
790 access("/run/systemd/journal/flushed", F_OK) >= 0) {
792 /* If in auto mode: first try to create the machine
793 * path, but not the prefix.
795 * If in persistent mode: create /var/log/journal and
796 * the machine path */
798 if (s->storage == STORAGE_PERSISTENT)
799 (void) mkdir("/var/log/journal/", 0755);
801 fn = strappend("/var/log/journal/", ids);
805 (void) mkdir(fn, 0755);
808 fn = strjoin("/var/log/journal/", ids, "/system.journal", NULL);
812 r = journal_file_open_reliably(fn, O_RDWR|O_CREAT, 0640, s->compress, s->seal, &s->system_metrics, s->mmap, NULL, &s->system_journal);
816 char fb[FORMAT_BYTES_MAX];
818 server_fix_perms(s, s->system_journal, 0);
819 server_driver_message(s, SD_ID128_NULL, "Allowing system journal files to grow to %s.",
820 format_bytes(fb, sizeof(fb), s->system_metrics.max_use));
824 if (r != -ENOENT && r != -EROFS)
825 log_warning("Failed to open system journal: %s", strerror(-r));
831 if (!s->runtime_journal &&
832 (s->storage != STORAGE_NONE)) {
834 fn = strjoin("/run/log/journal/", ids, "/system.journal", NULL);
838 if (s->system_journal) {
840 /* Try to open the runtime journal, but only
841 * if it already exists, so that we can flush
842 * it into the system journal */
844 r = journal_file_open(fn, O_RDWR, 0640, s->compress, false, &s->runtime_metrics, s->mmap, NULL, &s->runtime_journal);
849 log_warning("Failed to open runtime journal: %s", strerror(-r));
856 /* OK, we really need the runtime journal, so create
857 * it if necessary. */
859 (void) mkdir_parents(fn, 0755);
860 r = journal_file_open_reliably(fn, O_RDWR|O_CREAT, 0640, s->compress, false, &s->runtime_metrics, s->mmap, NULL, &s->runtime_journal);
864 log_error("Failed to open runtime journal: %s", strerror(-r));
869 if (s->runtime_journal) {
870 char fb[FORMAT_BYTES_MAX];
872 server_fix_perms(s, s->runtime_journal, 0);
873 server_driver_message(s, SD_ID128_NULL, "Allowing runtime journal files to grow to %s.",
874 format_bytes(fb, sizeof(fb), s->runtime_metrics.max_use));
881 int server_flush_to_var(Server *s) {
884 sd_journal *j = NULL;
888 if (s->storage != STORAGE_AUTO &&
889 s->storage != STORAGE_PERSISTENT)
892 if (!s->runtime_journal)
895 system_journal_open(s);
897 if (!s->system_journal)
900 log_debug("Flushing to /var...");
902 r = sd_id128_get_machine(&machine);
904 log_error("Failed to get machine id: %s", strerror(-r));
908 r = sd_journal_open(&j, SD_JOURNAL_RUNTIME_ONLY);
910 log_error("Failed to read runtime journal: %s", strerror(-r));
914 sd_journal_set_data_threshold(j, 0);
916 SD_JOURNAL_FOREACH(j) {
921 assert(f && f->current_offset > 0);
923 r = journal_file_move_to_object(f, OBJECT_ENTRY, f->current_offset, &o);
925 log_error("Can't read entry: %s", strerror(-r));
929 r = journal_file_copy_entry(f, s->system_journal, o, f->current_offset, NULL, NULL, NULL);
933 if (!shall_try_append_again(s->system_journal, r)) {
934 log_error("Can't write entry: %s", strerror(-r));
941 log_debug("Retrying write.");
942 r = journal_file_copy_entry(f, s->system_journal, o, f->current_offset, NULL, NULL, NULL);
944 log_error("Can't write entry: %s", strerror(-r));
950 journal_file_post_change(s->system_journal);
952 journal_file_close(s->runtime_journal);
953 s->runtime_journal = NULL;
956 rm_rf("/run/log/journal", false, true, false);
963 int process_event(Server *s, struct epoll_event *ev) {
967 if (ev->data.fd == s->signal_fd) {
968 struct signalfd_siginfo sfsi;
971 if (ev->events != EPOLLIN) {
972 log_error("Got invalid event from epoll.");
976 n = read(s->signal_fd, &sfsi, sizeof(sfsi));
977 if (n != sizeof(sfsi)) {
982 if (errno == EINTR || errno == EAGAIN)
988 if (sfsi.ssi_signo == SIGUSR1) {
989 touch("/run/systemd/journal/flushed");
990 server_flush_to_var(s);
995 if (sfsi.ssi_signo == SIGUSR2) {
1001 log_info("Received SIG%s", signal_to_string(sfsi.ssi_signo));
1005 } else if (ev->data.fd == s->sync_timer_fd) {
1009 log_debug("Got sync request from epoll.");
1011 r = read(ev->data.fd, (void *)&t, sizeof(t));
1018 } else if (ev->data.fd == s->dev_kmsg_fd) {
1021 if (ev->events != EPOLLIN) {
1022 log_error("Got invalid event from epoll.");
1026 r = server_read_dev_kmsg(s);
1032 } else if (ev->data.fd == s->native_fd ||
1033 ev->data.fd == s->syslog_fd) {
1035 if (ev->events != EPOLLIN) {
1036 log_error("Got invalid event from epoll.");
1041 struct msghdr msghdr;
1043 struct ucred *ucred = NULL;
1044 struct timeval *tv = NULL;
1045 struct cmsghdr *cmsg;
1047 size_t label_len = 0;
1049 struct cmsghdr cmsghdr;
1051 /* We use NAME_MAX space for the
1052 * SELinux label here. The kernel
1053 * currently enforces no limit, but
1054 * according to suggestions from the
1055 * SELinux people this will change and
1056 * it will probably be identical to
1057 * NAME_MAX. For now we use that, but
1058 * this should be updated one day when
1059 * the final limit is known.*/
1060 uint8_t buf[CMSG_SPACE(sizeof(struct ucred)) +
1061 CMSG_SPACE(sizeof(struct timeval)) +
1062 CMSG_SPACE(sizeof(int)) + /* fd */
1063 CMSG_SPACE(NAME_MAX)]; /* selinux label */
1070 if (ioctl(ev->data.fd, SIOCINQ, &v) < 0) {
1071 log_error("SIOCINQ failed: %m");
1075 if (s->buffer_size < (size_t) v) {
1079 l = MAX(LINE_MAX + (size_t) v, s->buffer_size * 2);
1080 b = realloc(s->buffer, l+1);
1083 log_error("Couldn't increase buffer.");
1092 iovec.iov_base = s->buffer;
1093 iovec.iov_len = s->buffer_size;
1097 msghdr.msg_iov = &iovec;
1098 msghdr.msg_iovlen = 1;
1099 msghdr.msg_control = &control;
1100 msghdr.msg_controllen = sizeof(control);
1102 n = recvmsg(ev->data.fd, &msghdr, MSG_DONTWAIT|MSG_CMSG_CLOEXEC);
1105 if (errno == EINTR || errno == EAGAIN)
1108 log_error("recvmsg() failed: %m");
1112 for (cmsg = CMSG_FIRSTHDR(&msghdr); cmsg; cmsg = CMSG_NXTHDR(&msghdr, cmsg)) {
1114 if (cmsg->cmsg_level == SOL_SOCKET &&
1115 cmsg->cmsg_type == SCM_CREDENTIALS &&
1116 cmsg->cmsg_len == CMSG_LEN(sizeof(struct ucred)))
1117 ucred = (struct ucred*) CMSG_DATA(cmsg);
1118 else if (cmsg->cmsg_level == SOL_SOCKET &&
1119 cmsg->cmsg_type == SCM_SECURITY) {
1120 label = (char*) CMSG_DATA(cmsg);
1121 label_len = cmsg->cmsg_len - CMSG_LEN(0);
1122 } else if (cmsg->cmsg_level == SOL_SOCKET &&
1123 cmsg->cmsg_type == SO_TIMESTAMP &&
1124 cmsg->cmsg_len == CMSG_LEN(sizeof(struct timeval)))
1125 tv = (struct timeval*) CMSG_DATA(cmsg);
1126 else if (cmsg->cmsg_level == SOL_SOCKET &&
1127 cmsg->cmsg_type == SCM_RIGHTS) {
1128 fds = (int*) CMSG_DATA(cmsg);
1129 n_fds = (cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int);
1133 if (ev->data.fd == s->syslog_fd) {
1136 if (n > 0 && n_fds == 0) {
1137 e = memchr(s->buffer, '\n', n);
1143 server_process_syslog_message(s, strstrip(s->buffer), ucred, tv, label, label_len);
1144 } else if (n_fds > 0)
1145 log_warning("Got file descriptors via syslog socket. Ignoring.");
1148 if (n > 0 && n_fds == 0)
1149 server_process_native_message(s, s->buffer, n, ucred, tv, label, label_len);
1150 else if (n == 0 && n_fds == 1)
1151 server_process_native_file(s, fds[0], ucred, tv, label, label_len);
1153 log_warning("Got too many file descriptors via native socket. Ignoring.");
1156 close_many(fds, n_fds);
1161 } else if (ev->data.fd == s->stdout_fd) {
1163 if (ev->events != EPOLLIN) {
1164 log_error("Got invalid event from epoll.");
1168 stdout_stream_new(s);
1172 StdoutStream *stream;
1174 if ((ev->events|EPOLLIN|EPOLLHUP) != (EPOLLIN|EPOLLHUP)) {
1175 log_error("Got invalid event from epoll.");
1179 /* If it is none of the well-known fds, it must be an
1180 * stdout stream fd. Note that this is a bit ugly here
1181 * (since we rely that none of the well-known fds
1182 * could be interpreted as pointer), but nonetheless
1183 * safe, since the well-known fds would never get an
1184 * fd > 4096, i.e. beyond the first memory page */
1186 stream = ev->data.ptr;
1188 if (stdout_stream_process(stream) <= 0)
1189 stdout_stream_free(stream);
1194 log_error("Unknown event.");
1198 static int open_signalfd(Server *s) {
1200 struct epoll_event ev;
1204 assert_se(sigemptyset(&mask) == 0);
1205 sigset_add_many(&mask, SIGINT, SIGTERM, SIGUSR1, SIGUSR2, -1);
1206 assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
1208 s->signal_fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC);
1209 if (s->signal_fd < 0) {
1210 log_error("signalfd(): %m");
1215 ev.events = EPOLLIN;
1216 ev.data.fd = s->signal_fd;
1218 if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->signal_fd, &ev) < 0) {
1219 log_error("epoll_ctl(): %m");
1226 static int server_parse_proc_cmdline(Server *s) {
1227 _cleanup_free_ char *line = NULL;
1232 if (detect_container(NULL) > 0)
1235 r = read_one_line_file("/proc/cmdline", &line);
1237 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
1241 FOREACH_WORD_QUOTED(w, l, line, state) {
1242 _cleanup_free_ char *word;
1244 word = strndup(w, l);
1248 if (startswith(word, "systemd.journald.forward_to_syslog=")) {
1249 r = parse_boolean(word + 35);
1251 log_warning("Failed to parse forward to syslog switch %s. Ignoring.", word + 35);
1253 s->forward_to_syslog = r;
1254 } else if (startswith(word, "systemd.journald.forward_to_kmsg=")) {
1255 r = parse_boolean(word + 33);
1257 log_warning("Failed to parse forward to kmsg switch %s. Ignoring.", word + 33);
1259 s->forward_to_kmsg = r;
1260 } else if (startswith(word, "systemd.journald.forward_to_console=")) {
1261 r = parse_boolean(word + 36);
1263 log_warning("Failed to parse forward to console switch %s. Ignoring.", word + 36);
1265 s->forward_to_console = r;
1266 } else if (startswith(word, "systemd.journald"))
1267 log_warning("Invalid systemd.journald parameter. Ignoring.");
1273 static int server_parse_config_file(Server *s) {
1274 static const char fn[] = "/etc/systemd/journald.conf";
1275 _cleanup_fclose_ FILE *f = NULL;
1280 f = fopen(fn, "re");
1282 if (errno == ENOENT)
1285 log_warning("Failed to open configuration file %s: %m", fn);
1289 r = config_parse(NULL, fn, f, "Journal\0", config_item_perf_lookup,
1290 (void*) journald_gperf_lookup, false, false, s);
1292 log_warning("Failed to parse configuration file: %s", strerror(-r));
1297 static int server_open_sync_timer(Server *s) {
1299 struct epoll_event ev;
1303 s->sync_timer_fd = timerfd_create(CLOCK_MONOTONIC, TFD_CLOEXEC);
1304 if (s->sync_timer_fd < 0)
1308 ev.events = EPOLLIN;
1309 ev.data.fd = s->sync_timer_fd;
1311 r = epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->sync_timer_fd, &ev);
1313 log_error("Failed to add idle timer fd to epoll object: %m");
1320 int server_schedule_sync(Server *s) {
1325 if (s->sync_scheduled)
1328 if (s->sync_interval_usec) {
1329 struct itimerspec sync_timer_enable = {
1330 .it_value.tv_sec = s->sync_interval_usec / USEC_PER_SEC,
1331 .it_value.tv_nsec = s->sync_interval_usec % MSEC_PER_SEC,
1334 r = timerfd_settime(s->sync_timer_fd, 0, &sync_timer_enable, NULL);
1339 s->sync_scheduled = true;
1344 int server_init(Server *s) {
1350 s->sync_timer_fd = s->syslog_fd = s->native_fd = s->stdout_fd =
1351 s->signal_fd = s->epoll_fd = s->dev_kmsg_fd = -1;
1355 s->sync_interval_usec = DEFAULT_SYNC_INTERVAL_USEC;
1356 s->sync_scheduled = false;
1358 s->rate_limit_interval = DEFAULT_RATE_LIMIT_INTERVAL;
1359 s->rate_limit_burst = DEFAULT_RATE_LIMIT_BURST;
1361 s->forward_to_syslog = true;
1363 s->max_level_store = LOG_DEBUG;
1364 s->max_level_syslog = LOG_DEBUG;
1365 s->max_level_kmsg = LOG_NOTICE;
1366 s->max_level_console = LOG_INFO;
1368 memset(&s->system_metrics, 0xFF, sizeof(s->system_metrics));
1369 memset(&s->runtime_metrics, 0xFF, sizeof(s->runtime_metrics));
1371 server_parse_config_file(s);
1372 server_parse_proc_cmdline(s);
1373 if (!!s->rate_limit_interval ^ !!s->rate_limit_burst) {
1374 log_debug("Setting both rate limit interval and burst from %llu,%u to 0,0",
1375 (long long unsigned) s->rate_limit_interval,
1376 s->rate_limit_burst);
1377 s->rate_limit_interval = s->rate_limit_burst = 0;
1380 mkdir_p("/run/systemd/journal", 0755);
1382 s->user_journals = hashmap_new(trivial_hash_func, trivial_compare_func);
1383 if (!s->user_journals)
1386 s->mmap = mmap_cache_new();
1390 s->epoll_fd = epoll_create1(EPOLL_CLOEXEC);
1391 if (s->epoll_fd < 0) {
1392 log_error("Failed to create epoll object: %m");
1396 n = sd_listen_fds(true);
1398 log_error("Failed to read listening file descriptors from environment: %s", strerror(-n));
1402 for (fd = SD_LISTEN_FDS_START; fd < SD_LISTEN_FDS_START + n; fd++) {
1404 if (sd_is_socket_unix(fd, SOCK_DGRAM, -1, "/run/systemd/journal/socket", 0) > 0) {
1406 if (s->native_fd >= 0) {
1407 log_error("Too many native sockets passed.");
1413 } else if (sd_is_socket_unix(fd, SOCK_STREAM, 1, "/run/systemd/journal/stdout", 0) > 0) {
1415 if (s->stdout_fd >= 0) {
1416 log_error("Too many stdout sockets passed.");
1422 } else if (sd_is_socket_unix(fd, SOCK_DGRAM, -1, "/dev/log", 0) > 0) {
1424 if (s->syslog_fd >= 0) {
1425 log_error("Too many /dev/log sockets passed.");
1432 log_error("Unknown socket passed.");
1437 r = server_open_syslog_socket(s);
1441 r = server_open_native_socket(s);
1445 r = server_open_stdout_socket(s);
1449 r = server_open_dev_kmsg(s);
1453 r = server_open_kernel_seqnum(s);
1457 r = server_open_sync_timer(s);
1461 r = open_signalfd(s);
1465 s->udev = udev_new();
1469 s->rate_limit = journal_rate_limit_new(s->rate_limit_interval,
1470 s->rate_limit_burst);
1474 r = system_journal_open(s);
1481 void server_maybe_append_tags(Server *s) {
1487 n = now(CLOCK_REALTIME);
1489 if (s->system_journal)
1490 journal_file_maybe_append_tag(s->system_journal, n);
1492 HASHMAP_FOREACH(f, s->user_journals, i)
1493 journal_file_maybe_append_tag(f, n);
1497 void server_done(Server *s) {
1501 while (s->stdout_streams)
1502 stdout_stream_free(s->stdout_streams);
1504 if (s->system_journal)
1505 journal_file_close(s->system_journal);
1507 if (s->runtime_journal)
1508 journal_file_close(s->runtime_journal);
1510 while ((f = hashmap_steal_first(s->user_journals)))
1511 journal_file_close(f);
1513 hashmap_free(s->user_journals);
1515 if (s->epoll_fd >= 0)
1516 close_nointr_nofail(s->epoll_fd);
1518 if (s->signal_fd >= 0)
1519 close_nointr_nofail(s->signal_fd);
1521 if (s->syslog_fd >= 0)
1522 close_nointr_nofail(s->syslog_fd);
1524 if (s->native_fd >= 0)
1525 close_nointr_nofail(s->native_fd);
1527 if (s->stdout_fd >= 0)
1528 close_nointr_nofail(s->stdout_fd);
1530 if (s->dev_kmsg_fd >= 0)
1531 close_nointr_nofail(s->dev_kmsg_fd);
1533 if (s->sync_timer_fd >= 0)
1534 close_nointr_nofail(s->sync_timer_fd);
1537 journal_rate_limit_free(s->rate_limit);
1539 if (s->kernel_seqnum)
1540 munmap(s->kernel_seqnum, sizeof(uint64_t));
1546 mmap_cache_unref(s->mmap);
1549 udev_unref(s->udev);