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>
35 #include <systemd/sd-login.h>
41 #include "journal-file.h"
42 #include "socket-util.h"
43 #include "cgroup-util.h"
47 #include "conf-parser.h"
48 #include "journal-internal.h"
49 #include "journal-vacuum.h"
50 #include "journal-authenticate.h"
51 #include "journald-server.h"
52 #include "journald-rate-limit.h"
53 #include "journald-kmsg.h"
54 #include "journald-syslog.h"
55 #include "journald-stream.h"
56 #include "journald-console.h"
57 #include "journald-native.h"
61 #include <acl/libacl.h>
66 #include <selinux/selinux.h>
69 #define USER_JOURNALS_MAX 1024
71 #define DEFAULT_SYNC_INTERVAL_USEC (5*USEC_PER_MINUTE)
72 #define DEFAULT_RATE_LIMIT_INTERVAL (10*USEC_PER_SEC)
73 #define DEFAULT_RATE_LIMIT_BURST 200
75 #define RECHECK_AVAILABLE_SPACE_USEC (30*USEC_PER_SEC)
77 static const char* const storage_table[] = {
78 [STORAGE_AUTO] = "auto",
79 [STORAGE_VOLATILE] = "volatile",
80 [STORAGE_PERSISTENT] = "persistent",
81 [STORAGE_NONE] = "none"
84 DEFINE_STRING_TABLE_LOOKUP(storage, Storage);
85 DEFINE_CONFIG_PARSE_ENUM(config_parse_storage, storage, Storage, "Failed to parse storage setting");
87 static const char* const split_mode_table[] = {
88 [SPLIT_NONE] = "none",
90 [SPLIT_LOGIN] = "login"
93 DEFINE_STRING_TABLE_LOOKUP(split_mode, SplitMode);
94 DEFINE_CONFIG_PARSE_ENUM(config_parse_split_mode, split_mode, SplitMode, "Failed to parse split mode setting");
96 static uint64_t available_space(Server *s) {
98 char _cleanup_free_ *p = NULL;
102 uint64_t sum = 0, avail = 0, ss_avail = 0;
104 DIR _cleanup_closedir_ *d = NULL;
108 ts = now(CLOCK_MONOTONIC);
110 if (s->cached_available_space_timestamp + RECHECK_AVAILABLE_SPACE_USEC > ts)
111 return s->cached_available_space;
113 r = sd_id128_get_machine(&machine);
117 if (s->system_journal) {
118 f = "/var/log/journal/";
119 m = &s->system_metrics;
121 f = "/run/log/journal/";
122 m = &s->runtime_metrics;
127 p = strappend(f, sd_id128_to_string(machine, ids));
135 if (fstatvfs(dirfd(d), &ss) < 0)
141 union dirent_storage buf;
143 r = readdir_r(d, &buf.de, &de);
150 if (!endswith(de->d_name, ".journal") &&
151 !endswith(de->d_name, ".journal~"))
154 if (fstatat(dirfd(d), de->d_name, &st, AT_SYMLINK_NOFOLLOW) < 0)
157 if (!S_ISREG(st.st_mode))
160 sum += (uint64_t) st.st_blocks * 512UL;
163 avail = sum >= m->max_use ? 0 : m->max_use - sum;
165 ss_avail = ss.f_bsize * ss.f_bavail;
167 ss_avail = ss_avail < m->keep_free ? 0 : ss_avail - m->keep_free;
169 if (ss_avail < avail)
172 s->cached_available_space = avail;
173 s->cached_available_space_timestamp = ts;
178 static void server_read_file_gid(Server *s) {
179 const char *g = "systemd-journal";
184 if (s->file_gid_valid)
187 r = get_group_creds(&g, &s->file_gid);
189 log_warning("Failed to resolve '%s' group: %s", g, strerror(-r));
191 /* if we couldn't read the gid, then it will be 0, but that's
192 * fine and we shouldn't try to resolve the group again, so
193 * let's just pretend it worked right-away. */
194 s->file_gid_valid = true;
197 void server_fix_perms(Server *s, JournalFile *f, uid_t uid) {
202 acl_permset_t permset;
207 server_read_file_gid(s);
209 r = fchmod_and_fchown(f->fd, 0640, 0, s->file_gid);
211 log_warning("Failed to fix access mode/rights on %s, ignoring: %s", f->path, strerror(-r));
217 acl = acl_get_fd(f->fd);
219 log_warning("Failed to read ACL on %s, ignoring: %m", f->path);
223 r = acl_find_uid(acl, uid, &entry);
226 if (acl_create_entry(&acl, &entry) < 0 ||
227 acl_set_tag_type(entry, ACL_USER) < 0 ||
228 acl_set_qualifier(entry, &uid) < 0) {
229 log_warning("Failed to patch ACL on %s, ignoring: %m", f->path);
234 if (acl_get_permset(entry, &permset) < 0 ||
235 acl_add_perm(permset, ACL_READ) < 0 ||
236 acl_calc_mask(&acl) < 0) {
237 log_warning("Failed to patch ACL on %s, ignoring: %m", f->path);
241 if (acl_set_fd(f->fd, acl) < 0)
242 log_warning("Failed to set ACL on %s, ignoring: %m", f->path);
249 static JournalFile* find_journal(Server *s, uid_t uid) {
257 /* We split up user logs only on /var, not on /run. If the
258 * runtime file is open, we write to it exclusively, in order
259 * to guarantee proper order as soon as we flush /run to
260 * /var and close the runtime file. */
262 if (s->runtime_journal)
263 return s->runtime_journal;
266 return s->system_journal;
268 r = sd_id128_get_machine(&machine);
270 return s->system_journal;
272 f = hashmap_get(s->user_journals, UINT32_TO_PTR(uid));
276 if (asprintf(&p, "/var/log/journal/" SD_ID128_FORMAT_STR "/user-%lu.journal",
277 SD_ID128_FORMAT_VAL(machine), (unsigned long) uid) < 0)
278 return s->system_journal;
280 while (hashmap_size(s->user_journals) >= USER_JOURNALS_MAX) {
281 /* Too many open? Then let's close one */
282 f = hashmap_steal_first(s->user_journals);
284 journal_file_close(f);
287 r = journal_file_open_reliably(p, O_RDWR|O_CREAT, 0640, s->compress, s->seal, &s->system_metrics, s->mmap, s->system_journal, &f);
291 return s->system_journal;
293 server_fix_perms(s, f, uid);
295 r = hashmap_put(s->user_journals, UINT32_TO_PTR(uid), f);
297 journal_file_close(f);
298 return s->system_journal;
304 void server_rotate(Server *s) {
310 log_debug("Rotating...");
312 if (s->runtime_journal) {
313 r = journal_file_rotate(&s->runtime_journal, s->compress, false);
315 if (s->runtime_journal)
316 log_error("Failed to rotate %s: %s", s->runtime_journal->path, strerror(-r));
318 log_error("Failed to create new runtime journal: %s", strerror(-r));
320 server_fix_perms(s, s->runtime_journal, 0);
323 if (s->system_journal) {
324 r = journal_file_rotate(&s->system_journal, s->compress, s->seal);
326 if (s->system_journal)
327 log_error("Failed to rotate %s: %s", s->system_journal->path, strerror(-r));
329 log_error("Failed to create new system journal: %s", strerror(-r));
332 server_fix_perms(s, s->system_journal, 0);
335 HASHMAP_FOREACH_KEY(f, k, s->user_journals, i) {
336 r = journal_file_rotate(&f, s->compress, s->seal);
339 log_error("Failed to rotate %s: %s", f->path, strerror(-r));
341 log_error("Failed to create user journal: %s", strerror(-r));
343 hashmap_replace(s->user_journals, k, f);
344 server_fix_perms(s, f, PTR_TO_UINT32(k));
349 void server_sync(Server *s) {
355 static const struct itimerspec sync_timer_disable = {};
357 if (s->system_journal) {
358 r = journal_file_set_offline(s->system_journal);
360 log_error("Failed to sync system journal: %s", strerror(-r));
363 HASHMAP_FOREACH_KEY(f, k, s->user_journals, i) {
364 r = journal_file_set_offline(f);
366 log_error("Failed to sync user journal: %s", strerror(-r));
369 r = timerfd_settime(s->sync_timer_fd, 0, &sync_timer_disable, NULL);
371 log_error("Failed to disable max timer: %m");
373 s->sync_scheduled = false;
376 void server_vacuum(Server *s) {
382 log_debug("Vacuuming...");
384 s->oldest_file_usec = 0;
386 r = sd_id128_get_machine(&machine);
388 log_error("Failed to get machine ID: %s", strerror(-r));
392 sd_id128_to_string(machine, ids);
394 if (s->system_journal) {
395 p = strappend("/var/log/journal/", ids);
401 r = journal_directory_vacuum(p, s->system_metrics.max_use, s->system_metrics.keep_free, s->max_retention_usec, &s->oldest_file_usec);
402 if (r < 0 && r != -ENOENT)
403 log_error("Failed to vacuum %s: %s", p, strerror(-r));
407 if (s->runtime_journal) {
408 p = strappend("/run/log/journal/", ids);
414 r = journal_directory_vacuum(p, s->runtime_metrics.max_use, s->runtime_metrics.keep_free, s->max_retention_usec, &s->oldest_file_usec);
415 if (r < 0 && r != -ENOENT)
416 log_error("Failed to vacuum %s: %s", p, strerror(-r));
420 s->cached_available_space_timestamp = 0;
423 static char *shortened_cgroup_path(pid_t pid) {
425 char _cleanup_free_ *process_path = NULL, *init_path = NULL;
430 r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, pid, &process_path);
434 r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, 1, &init_path);
438 if (endswith(init_path, "/system"))
439 init_path[strlen(init_path) - 7] = 0;
440 else if (streq(init_path, "/"))
443 if (startswith(process_path, init_path)) {
444 path = strdup(process_path + strlen(init_path));
453 bool shall_try_append_again(JournalFile *f, int r) {
455 /* -E2BIG Hit configured limit
457 -EDQUOT Quota limit hit
459 -EHOSTDOWN Other machine
460 -EBUSY Unclean shutdown
461 -EPROTONOSUPPORT Unsupported feature
464 -ESHUTDOWN Already archived */
466 if (r == -E2BIG || r == -EFBIG || r == -EDQUOT || r == -ENOSPC)
467 log_debug("%s: Allocation limit reached, rotating.", f->path);
468 else if (r == -EHOSTDOWN)
469 log_info("%s: Journal file from other machine, rotating.", f->path);
470 else if (r == -EBUSY)
471 log_info("%s: Unclean shutdown, rotating.", f->path);
472 else if (r == -EPROTONOSUPPORT)
473 log_info("%s: Unsupported feature, rotating.", f->path);
474 else if (r == -EBADMSG || r == -ENODATA || r == ESHUTDOWN)
475 log_warning("%s: Journal file corrupted, rotating.", f->path);
482 static void write_to_journal(Server *s, uid_t uid, struct iovec *iovec, unsigned n) {
484 bool vacuumed = false;
491 f = find_journal(s, uid);
495 if (journal_file_rotate_suggested(f, s->max_file_usec)) {
496 log_debug("%s: Journal header limits reached or header out-of-date, rotating.", f->path);
501 f = find_journal(s, uid);
506 r = journal_file_append_entry(f, NULL, iovec, n, &s->seqnum, NULL, NULL);
508 server_schedule_sync(s);
512 if (vacuumed || !shall_try_append_again(f, r)) {
513 log_error("Failed to write entry, ignoring: %s", strerror(-r));
520 f = find_journal(s, uid);
524 log_debug("Retrying write.");
525 r = journal_file_append_entry(f, NULL, iovec, n, &s->seqnum, NULL, NULL);
527 log_error("Failed to write entry, ignoring: %s", strerror(-r));
530 static void dispatch_message_real(
532 struct iovec *iovec, unsigned n, unsigned m,
535 const char *label, size_t label_len,
536 const char *unit_id) {
538 char _cleanup_free_ *pid = NULL, *uid = NULL, *gid = NULL,
539 *source_time = NULL, *boot_id = NULL, *machine_id = NULL,
540 *comm = NULL, *cmdline = NULL, *hostname = NULL,
541 *audit_session = NULL, *audit_loginuid = NULL,
542 *exe = NULL, *cgroup = NULL, *session = NULL,
543 *owner_uid = NULL, *unit = NULL, *selinux_context = NULL;
549 uid_t realuid = 0, owner = 0, journal_uid;
550 bool owner_valid = false;
555 assert(n + N_IOVEC_META_FIELDS <= m);
561 realuid = ucred->uid;
563 if (asprintf(&pid, "_PID=%lu", (unsigned long) ucred->pid) >= 0)
564 IOVEC_SET_STRING(iovec[n++], pid);
566 if (asprintf(&uid, "_UID=%lu", (unsigned long) ucred->uid) >= 0)
567 IOVEC_SET_STRING(iovec[n++], uid);
569 if (asprintf(&gid, "_GID=%lu", (unsigned long) ucred->gid) >= 0)
570 IOVEC_SET_STRING(iovec[n++], gid);
572 r = get_process_comm(ucred->pid, &t);
574 comm = strappend("_COMM=", t);
578 IOVEC_SET_STRING(iovec[n++], comm);
581 r = get_process_exe(ucred->pid, &t);
583 exe = strappend("_EXE=", t);
587 IOVEC_SET_STRING(iovec[n++], exe);
590 r = get_process_cmdline(ucred->pid, 0, false, &t);
592 cmdline = strappend("_CMDLINE=", t);
596 IOVEC_SET_STRING(iovec[n++], cmdline);
599 r = audit_session_from_pid(ucred->pid, &audit);
601 if (asprintf(&audit_session, "_AUDIT_SESSION=%lu", (unsigned long) audit) >= 0)
602 IOVEC_SET_STRING(iovec[n++], audit_session);
604 r = audit_loginuid_from_pid(ucred->pid, &loginuid);
606 if (asprintf(&audit_loginuid, "_AUDIT_LOGINUID=%lu", (unsigned long) loginuid) >= 0)
607 IOVEC_SET_STRING(iovec[n++], audit_loginuid);
609 t = shortened_cgroup_path(ucred->pid);
611 cgroup = strappend("_SYSTEMD_CGROUP=", t);
615 IOVEC_SET_STRING(iovec[n++], cgroup);
619 if (sd_pid_get_session(ucred->pid, &t) >= 0) {
620 session = strappend("_SYSTEMD_SESSION=", t);
624 IOVEC_SET_STRING(iovec[n++], session);
627 if (sd_pid_get_owner_uid(ucred->pid, &owner) >= 0) {
629 if (asprintf(&owner_uid, "_SYSTEMD_OWNER_UID=%lu", (unsigned long) owner) >= 0)
630 IOVEC_SET_STRING(iovec[n++], owner_uid);
634 if (cg_pid_get_unit(ucred->pid, &t) >= 0) {
635 unit = strappend("_SYSTEMD_UNIT=", t);
637 } else if (cg_pid_get_user_unit(ucred->pid, &t) >= 0) {
638 unit = strappend("_SYSTEMD_USER_UNIT=", t);
640 } else if (unit_id) {
642 unit = strappend("_SYSTEMD_USER_UNIT=", unit_id);
644 unit = strappend("_SYSTEMD_UNIT=", unit_id);
648 IOVEC_SET_STRING(iovec[n++], unit);
652 selinux_context = malloc(sizeof("_SELINUX_CONTEXT=") + label_len);
653 if (selinux_context) {
654 *((char*) mempcpy(stpcpy(selinux_context, "_SELINUX_CONTEXT="), label, label_len)) = 0;
655 IOVEC_SET_STRING(iovec[n++], selinux_context);
658 security_context_t con;
660 if (getpidcon(ucred->pid, &con) >= 0) {
661 selinux_context = strappend("_SELINUX_CONTEXT=", con);
663 IOVEC_SET_STRING(iovec[n++], selinux_context);
671 if (asprintf(&source_time, "_SOURCE_REALTIME_TIMESTAMP=%llu",
672 (unsigned long long) timeval_load(tv)) >= 0)
673 IOVEC_SET_STRING(iovec[n++], source_time);
676 /* Note that strictly speaking storing the boot id here is
677 * redundant since the entry includes this in-line
678 * anyway. However, we need this indexed, too. */
679 r = sd_id128_get_boot(&id);
681 if (asprintf(&boot_id, "_BOOT_ID=%s", sd_id128_to_string(id, idbuf)) >= 0)
682 IOVEC_SET_STRING(iovec[n++], boot_id);
684 r = sd_id128_get_machine(&id);
686 if (asprintf(&machine_id, "_MACHINE_ID=%s", sd_id128_to_string(id, idbuf)) >= 0)
687 IOVEC_SET_STRING(iovec[n++], machine_id);
689 t = gethostname_malloc();
691 hostname = strappend("_HOSTNAME=", t);
694 IOVEC_SET_STRING(iovec[n++], hostname);
699 if (s->split_mode == SPLIT_UID && realuid > 0)
700 /* Split up strictly by any UID */
701 journal_uid = realuid;
702 else if (s->split_mode == SPLIT_LOGIN && realuid > 0 && owner_valid && owner > 0)
703 /* Split up by login UIDs, this avoids creation of
704 * individual journals for system UIDs. We do this
705 * only if the realuid is not root, in order not to
706 * accidentally leak privileged information to the
707 * user that is logged by a privileged process that is
708 * part of an unprivileged session.*/
713 write_to_journal(s, journal_uid, iovec, n);
716 void server_driver_message(Server *s, sd_id128_t message_id, const char *format, ...) {
717 char mid[11 + 32 + 1];
718 char buffer[16 + LINE_MAX + 1];
719 struct iovec iovec[N_IOVEC_META_FIELDS + 4];
722 struct ucred ucred = {};
727 IOVEC_SET_STRING(iovec[n++], "PRIORITY=6");
728 IOVEC_SET_STRING(iovec[n++], "_TRANSPORT=driver");
730 memcpy(buffer, "MESSAGE=", 8);
731 va_start(ap, format);
732 vsnprintf(buffer + 8, sizeof(buffer) - 8, format, ap);
734 char_array_0(buffer);
735 IOVEC_SET_STRING(iovec[n++], buffer);
737 if (!sd_id128_equal(message_id, SD_ID128_NULL)) {
738 snprintf(mid, sizeof(mid), MESSAGE_ID(message_id));
740 IOVEC_SET_STRING(iovec[n++], mid);
743 ucred.pid = getpid();
744 ucred.uid = getuid();
745 ucred.gid = getgid();
747 dispatch_message_real(s, iovec, n, ELEMENTSOF(iovec), &ucred, NULL, NULL, 0, NULL);
750 void server_dispatch_message(
752 struct iovec *iovec, unsigned n, unsigned m,
755 const char *label, size_t label_len,
760 char _cleanup_free_ *path = NULL;
764 assert(iovec || n == 0);
769 if (LOG_PRI(priority) > s->max_level_store)
775 path = shortened_cgroup_path(ucred->pid);
779 /* example: /user/lennart/3/foobar
780 * /system/dbus.service/foobar
782 * So let's cut of everything past the third /, since that is
783 * where user directories start */
785 c = strchr(path, '/');
787 c = strchr(c+1, '/');
789 c = strchr(c+1, '/');
795 rl = journal_rate_limit_test(s->rate_limit, path,
796 priority & LOG_PRIMASK, available_space(s));
801 /* Write a suppression message if we suppressed something */
803 server_driver_message(s, SD_MESSAGE_JOURNAL_DROPPED,
804 "Suppressed %u messages from %s", rl - 1, path);
807 dispatch_message_real(s, iovec, n, m, ucred, tv, label, label_len, unit_id);
811 static int system_journal_open(Server *s) {
817 r = sd_id128_get_machine(&machine);
821 sd_id128_to_string(machine, ids);
823 if (!s->system_journal &&
824 (s->storage == STORAGE_PERSISTENT || s->storage == STORAGE_AUTO) &&
825 access("/run/systemd/journal/flushed", F_OK) >= 0) {
827 /* If in auto mode: first try to create the machine
828 * path, but not the prefix.
830 * If in persistent mode: create /var/log/journal and
831 * the machine path */
833 if (s->storage == STORAGE_PERSISTENT)
834 (void) mkdir("/var/log/journal/", 0755);
836 fn = strappend("/var/log/journal/", ids);
840 (void) mkdir(fn, 0755);
843 fn = strjoin("/var/log/journal/", ids, "/system.journal", NULL);
847 r = journal_file_open_reliably(fn, O_RDWR|O_CREAT, 0640, s->compress, s->seal, &s->system_metrics, s->mmap, NULL, &s->system_journal);
851 char fb[FORMAT_BYTES_MAX];
853 server_fix_perms(s, s->system_journal, 0);
854 server_driver_message(s, SD_ID128_NULL, "Allowing system journal files to grow to %s.",
855 format_bytes(fb, sizeof(fb), s->system_metrics.max_use));
859 if (r != -ENOENT && r != -EROFS)
860 log_warning("Failed to open system journal: %s", strerror(-r));
866 if (!s->runtime_journal &&
867 (s->storage != STORAGE_NONE)) {
869 fn = strjoin("/run/log/journal/", ids, "/system.journal", NULL);
873 if (s->system_journal) {
875 /* Try to open the runtime journal, but only
876 * if it already exists, so that we can flush
877 * it into the system journal */
879 r = journal_file_open(fn, O_RDWR, 0640, s->compress, false, &s->runtime_metrics, s->mmap, NULL, &s->runtime_journal);
884 log_warning("Failed to open runtime journal: %s", strerror(-r));
891 /* OK, we really need the runtime journal, so create
892 * it if necessary. */
894 (void) mkdir_parents(fn, 0755);
895 r = journal_file_open_reliably(fn, O_RDWR|O_CREAT, 0640, s->compress, false, &s->runtime_metrics, s->mmap, NULL, &s->runtime_journal);
899 log_error("Failed to open runtime journal: %s", strerror(-r));
904 if (s->runtime_journal) {
905 char fb[FORMAT_BYTES_MAX];
907 server_fix_perms(s, s->runtime_journal, 0);
908 server_driver_message(s, SD_ID128_NULL, "Allowing runtime journal files to grow to %s.",
909 format_bytes(fb, sizeof(fb), s->runtime_metrics.max_use));
916 int server_flush_to_var(Server *s) {
919 sd_journal *j = NULL;
923 if (s->storage != STORAGE_AUTO &&
924 s->storage != STORAGE_PERSISTENT)
927 if (!s->runtime_journal)
930 system_journal_open(s);
932 if (!s->system_journal)
935 log_debug("Flushing to /var...");
937 r = sd_id128_get_machine(&machine);
939 log_error("Failed to get machine id: %s", strerror(-r));
943 r = sd_journal_open(&j, SD_JOURNAL_RUNTIME_ONLY);
945 log_error("Failed to read runtime journal: %s", strerror(-r));
949 sd_journal_set_data_threshold(j, 0);
951 SD_JOURNAL_FOREACH(j) {
956 assert(f && f->current_offset > 0);
958 r = journal_file_move_to_object(f, OBJECT_ENTRY, f->current_offset, &o);
960 log_error("Can't read entry: %s", strerror(-r));
964 r = journal_file_copy_entry(f, s->system_journal, o, f->current_offset, NULL, NULL, NULL);
968 if (!shall_try_append_again(s->system_journal, r)) {
969 log_error("Can't write entry: %s", strerror(-r));
976 log_debug("Retrying write.");
977 r = journal_file_copy_entry(f, s->system_journal, o, f->current_offset, NULL, NULL, NULL);
979 log_error("Can't write entry: %s", strerror(-r));
985 journal_file_post_change(s->system_journal);
987 journal_file_close(s->runtime_journal);
988 s->runtime_journal = NULL;
991 rm_rf("/run/log/journal", false, true, false);
998 int process_event(Server *s, struct epoll_event *ev) {
1002 if (ev->data.fd == s->signal_fd) {
1003 struct signalfd_siginfo sfsi;
1006 if (ev->events != EPOLLIN) {
1007 log_error("Got invalid event from epoll.");
1011 n = read(s->signal_fd, &sfsi, sizeof(sfsi));
1012 if (n != sizeof(sfsi)) {
1017 if (errno == EINTR || errno == EAGAIN)
1023 if (sfsi.ssi_signo == SIGUSR1) {
1024 touch("/run/systemd/journal/flushed");
1025 server_flush_to_var(s);
1030 if (sfsi.ssi_signo == SIGUSR2) {
1036 log_info("Received SIG%s", signal_to_string(sfsi.ssi_signo));
1040 } else if (ev->data.fd == s->sync_timer_fd) {
1044 log_debug("Got sync request from epoll.");
1046 r = read(ev->data.fd, (void *)&t, sizeof(t));
1053 } else if (ev->data.fd == s->dev_kmsg_fd) {
1056 if (ev->events != EPOLLIN) {
1057 log_error("Got invalid event from epoll.");
1061 r = server_read_dev_kmsg(s);
1067 } else if (ev->data.fd == s->native_fd ||
1068 ev->data.fd == s->syslog_fd) {
1070 if (ev->events != EPOLLIN) {
1071 log_error("Got invalid event from epoll.");
1076 struct msghdr msghdr;
1078 struct ucred *ucred = NULL;
1079 struct timeval *tv = NULL;
1080 struct cmsghdr *cmsg;
1082 size_t label_len = 0;
1084 struct cmsghdr cmsghdr;
1086 /* We use NAME_MAX space for the
1087 * SELinux label here. The kernel
1088 * currently enforces no limit, but
1089 * according to suggestions from the
1090 * SELinux people this will change and
1091 * it will probably be identical to
1092 * NAME_MAX. For now we use that, but
1093 * this should be updated one day when
1094 * the final limit is known.*/
1095 uint8_t buf[CMSG_SPACE(sizeof(struct ucred)) +
1096 CMSG_SPACE(sizeof(struct timeval)) +
1097 CMSG_SPACE(sizeof(int)) + /* fd */
1098 CMSG_SPACE(NAME_MAX)]; /* selinux label */
1105 if (ioctl(ev->data.fd, SIOCINQ, &v) < 0) {
1106 log_error("SIOCINQ failed: %m");
1110 if (s->buffer_size < (size_t) v) {
1114 l = MAX(LINE_MAX + (size_t) v, s->buffer_size * 2);
1115 b = realloc(s->buffer, l+1);
1118 log_error("Couldn't increase buffer.");
1127 iovec.iov_base = s->buffer;
1128 iovec.iov_len = s->buffer_size;
1132 msghdr.msg_iov = &iovec;
1133 msghdr.msg_iovlen = 1;
1134 msghdr.msg_control = &control;
1135 msghdr.msg_controllen = sizeof(control);
1137 n = recvmsg(ev->data.fd, &msghdr, MSG_DONTWAIT|MSG_CMSG_CLOEXEC);
1140 if (errno == EINTR || errno == EAGAIN)
1143 log_error("recvmsg() failed: %m");
1147 for (cmsg = CMSG_FIRSTHDR(&msghdr); cmsg; cmsg = CMSG_NXTHDR(&msghdr, cmsg)) {
1149 if (cmsg->cmsg_level == SOL_SOCKET &&
1150 cmsg->cmsg_type == SCM_CREDENTIALS &&
1151 cmsg->cmsg_len == CMSG_LEN(sizeof(struct ucred)))
1152 ucred = (struct ucred*) CMSG_DATA(cmsg);
1153 else if (cmsg->cmsg_level == SOL_SOCKET &&
1154 cmsg->cmsg_type == SCM_SECURITY) {
1155 label = (char*) CMSG_DATA(cmsg);
1156 label_len = cmsg->cmsg_len - CMSG_LEN(0);
1157 } else if (cmsg->cmsg_level == SOL_SOCKET &&
1158 cmsg->cmsg_type == SO_TIMESTAMP &&
1159 cmsg->cmsg_len == CMSG_LEN(sizeof(struct timeval)))
1160 tv = (struct timeval*) CMSG_DATA(cmsg);
1161 else if (cmsg->cmsg_level == SOL_SOCKET &&
1162 cmsg->cmsg_type == SCM_RIGHTS) {
1163 fds = (int*) CMSG_DATA(cmsg);
1164 n_fds = (cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int);
1168 if (ev->data.fd == s->syslog_fd) {
1171 if (n > 0 && n_fds == 0) {
1172 e = memchr(s->buffer, '\n', n);
1178 server_process_syslog_message(s, strstrip(s->buffer), ucred, tv, label, label_len);
1179 } else if (n_fds > 0)
1180 log_warning("Got file descriptors via syslog socket. Ignoring.");
1183 if (n > 0 && n_fds == 0)
1184 server_process_native_message(s, s->buffer, n, ucred, tv, label, label_len);
1185 else if (n == 0 && n_fds == 1)
1186 server_process_native_file(s, fds[0], ucred, tv, label, label_len);
1188 log_warning("Got too many file descriptors via native socket. Ignoring.");
1191 close_many(fds, n_fds);
1196 } else if (ev->data.fd == s->stdout_fd) {
1198 if (ev->events != EPOLLIN) {
1199 log_error("Got invalid event from epoll.");
1203 stdout_stream_new(s);
1207 StdoutStream *stream;
1209 if ((ev->events|EPOLLIN|EPOLLHUP) != (EPOLLIN|EPOLLHUP)) {
1210 log_error("Got invalid event from epoll.");
1214 /* If it is none of the well-known fds, it must be an
1215 * stdout stream fd. Note that this is a bit ugly here
1216 * (since we rely that none of the well-known fds
1217 * could be interpreted as pointer), but nonetheless
1218 * safe, since the well-known fds would never get an
1219 * fd > 4096, i.e. beyond the first memory page */
1221 stream = ev->data.ptr;
1223 if (stdout_stream_process(stream) <= 0)
1224 stdout_stream_free(stream);
1229 log_error("Unknown event.");
1233 static int open_signalfd(Server *s) {
1235 struct epoll_event ev;
1239 assert_se(sigemptyset(&mask) == 0);
1240 sigset_add_many(&mask, SIGINT, SIGTERM, SIGUSR1, SIGUSR2, -1);
1241 assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
1243 s->signal_fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC);
1244 if (s->signal_fd < 0) {
1245 log_error("signalfd(): %m");
1250 ev.events = EPOLLIN;
1251 ev.data.fd = s->signal_fd;
1253 if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->signal_fd, &ev) < 0) {
1254 log_error("epoll_ctl(): %m");
1261 static int server_parse_proc_cmdline(Server *s) {
1262 char _cleanup_free_ *line = NULL;
1267 if (detect_container(NULL) > 0)
1270 r = read_one_line_file("/proc/cmdline", &line);
1272 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
1276 FOREACH_WORD_QUOTED(w, l, line, state) {
1277 char _cleanup_free_ *word;
1279 word = strndup(w, l);
1283 if (startswith(word, "systemd.journald.forward_to_syslog=")) {
1284 r = parse_boolean(word + 35);
1286 log_warning("Failed to parse forward to syslog switch %s. Ignoring.", word + 35);
1288 s->forward_to_syslog = r;
1289 } else if (startswith(word, "systemd.journald.forward_to_kmsg=")) {
1290 r = parse_boolean(word + 33);
1292 log_warning("Failed to parse forward to kmsg switch %s. Ignoring.", word + 33);
1294 s->forward_to_kmsg = r;
1295 } else if (startswith(word, "systemd.journald.forward_to_console=")) {
1296 r = parse_boolean(word + 36);
1298 log_warning("Failed to parse forward to console switch %s. Ignoring.", word + 36);
1300 s->forward_to_console = r;
1301 } else if (startswith(word, "systemd.journald"))
1302 log_warning("Invalid systemd.journald parameter. Ignoring.");
1308 static int server_parse_config_file(Server *s) {
1309 static const char *fn = "/etc/systemd/journald.conf";
1310 FILE _cleanup_fclose_ *f = NULL;
1315 f = fopen(fn, "re");
1317 if (errno == ENOENT)
1320 log_warning("Failed to open configuration file %s: %m", fn);
1324 r = config_parse(fn, f, "Journal\0", config_item_perf_lookup,
1325 (void*) journald_gperf_lookup, false, s);
1327 log_warning("Failed to parse configuration file: %s", strerror(-r));
1332 static int server_open_sync_timer(Server *s) {
1334 struct epoll_event ev;
1338 s->sync_timer_fd = timerfd_create(CLOCK_MONOTONIC, TFD_CLOEXEC);
1339 if (s->sync_timer_fd < 0)
1343 ev.events = EPOLLIN;
1344 ev.data.fd = s->sync_timer_fd;
1346 r = epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->sync_timer_fd, &ev);
1348 log_error("Failed to add idle timer fd to epoll object: %m");
1355 int server_schedule_sync(Server *s) {
1360 if (s->sync_scheduled)
1363 if (s->sync_interval_usec) {
1364 struct itimerspec sync_timer_enable = {
1365 .it_value.tv_sec = s->sync_interval_usec / USEC_PER_SEC,
1366 .it_value.tv_nsec = s->sync_interval_usec % MSEC_PER_SEC,
1369 r = timerfd_settime(s->sync_timer_fd, 0, &sync_timer_enable, NULL);
1374 s->sync_scheduled = true;
1379 int server_init(Server *s) {
1385 s->sync_timer_fd = s->syslog_fd = s->native_fd = s->stdout_fd =
1386 s->signal_fd = s->epoll_fd = s->dev_kmsg_fd = -1;
1390 s->sync_interval_usec = DEFAULT_SYNC_INTERVAL_USEC;
1391 s->sync_scheduled = false;
1393 s->rate_limit_interval = DEFAULT_RATE_LIMIT_INTERVAL;
1394 s->rate_limit_burst = DEFAULT_RATE_LIMIT_BURST;
1396 s->forward_to_syslog = true;
1398 s->max_level_store = LOG_DEBUG;
1399 s->max_level_syslog = LOG_DEBUG;
1400 s->max_level_kmsg = LOG_NOTICE;
1401 s->max_level_console = LOG_INFO;
1403 memset(&s->system_metrics, 0xFF, sizeof(s->system_metrics));
1404 memset(&s->runtime_metrics, 0xFF, sizeof(s->runtime_metrics));
1406 server_parse_config_file(s);
1407 server_parse_proc_cmdline(s);
1408 if (!!s->rate_limit_interval ^ !!s->rate_limit_burst) {
1409 log_debug("Setting both rate limit interval and burst from %llu,%u to 0,0",
1410 (long long unsigned) s->rate_limit_interval,
1411 s->rate_limit_burst);
1412 s->rate_limit_interval = s->rate_limit_burst = 0;
1415 mkdir_p("/run/systemd/journal", 0755);
1417 s->user_journals = hashmap_new(trivial_hash_func, trivial_compare_func);
1418 if (!s->user_journals)
1421 s->mmap = mmap_cache_new();
1425 s->epoll_fd = epoll_create1(EPOLL_CLOEXEC);
1426 if (s->epoll_fd < 0) {
1427 log_error("Failed to create epoll object: %m");
1431 n = sd_listen_fds(true);
1433 log_error("Failed to read listening file descriptors from environment: %s", strerror(-n));
1437 for (fd = SD_LISTEN_FDS_START; fd < SD_LISTEN_FDS_START + n; fd++) {
1439 if (sd_is_socket_unix(fd, SOCK_DGRAM, -1, "/run/systemd/journal/socket", 0) > 0) {
1441 if (s->native_fd >= 0) {
1442 log_error("Too many native sockets passed.");
1448 } else if (sd_is_socket_unix(fd, SOCK_STREAM, 1, "/run/systemd/journal/stdout", 0) > 0) {
1450 if (s->stdout_fd >= 0) {
1451 log_error("Too many stdout sockets passed.");
1457 } else if (sd_is_socket_unix(fd, SOCK_DGRAM, -1, "/dev/log", 0) > 0) {
1459 if (s->syslog_fd >= 0) {
1460 log_error("Too many /dev/log sockets passed.");
1467 log_error("Unknown socket passed.");
1472 r = server_open_syslog_socket(s);
1476 r = server_open_native_socket(s);
1480 r = server_open_stdout_socket(s);
1484 r = server_open_dev_kmsg(s);
1488 r = server_open_kernel_seqnum(s);
1492 r = server_open_sync_timer(s);
1496 r = open_signalfd(s);
1500 s->udev = udev_new();
1504 s->rate_limit = journal_rate_limit_new(s->rate_limit_interval,
1505 s->rate_limit_burst);
1509 r = system_journal_open(s);
1516 void server_maybe_append_tags(Server *s) {
1522 n = now(CLOCK_REALTIME);
1524 if (s->system_journal)
1525 journal_file_maybe_append_tag(s->system_journal, n);
1527 HASHMAP_FOREACH(f, s->user_journals, i)
1528 journal_file_maybe_append_tag(f, n);
1532 void server_done(Server *s) {
1536 while (s->stdout_streams)
1537 stdout_stream_free(s->stdout_streams);
1539 if (s->system_journal)
1540 journal_file_close(s->system_journal);
1542 if (s->runtime_journal)
1543 journal_file_close(s->runtime_journal);
1545 while ((f = hashmap_steal_first(s->user_journals)))
1546 journal_file_close(f);
1548 hashmap_free(s->user_journals);
1550 if (s->epoll_fd >= 0)
1551 close_nointr_nofail(s->epoll_fd);
1553 if (s->signal_fd >= 0)
1554 close_nointr_nofail(s->signal_fd);
1556 if (s->syslog_fd >= 0)
1557 close_nointr_nofail(s->syslog_fd);
1559 if (s->native_fd >= 0)
1560 close_nointr_nofail(s->native_fd);
1562 if (s->stdout_fd >= 0)
1563 close_nointr_nofail(s->stdout_fd);
1565 if (s->dev_kmsg_fd >= 0)
1566 close_nointr_nofail(s->dev_kmsg_fd);
1568 if (s->sync_timer_fd >= 0)
1569 close_nointr_nofail(s->sync_timer_fd);
1572 journal_rate_limit_free(s->rate_limit);
1574 if (s->kernel_seqnum)
1575 munmap(s->kernel_seqnum, sizeof(uint64_t));
1581 mmap_cache_unref(s->mmap);
1584 udev_unref(s->udev);