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>
34 #include <systemd/sd-journal.h>
35 #include <systemd/sd-login.h>
36 #include <systemd/sd-messages.h>
37 #include <systemd/sd-daemon.h>
40 #include "journal-file.h"
41 #include "socket-util.h"
42 #include "cgroup-util.h"
44 #include "journal-rate-limit.h"
45 #include "journal-internal.h"
46 #include "conf-parser.h"
53 #include <acl/libacl.h>
58 #include <selinux/selinux.h>
61 #define USER_JOURNALS_MAX 1024
62 #define STDOUT_STREAMS_MAX 4096
64 #define DEFAULT_RATE_LIMIT_INTERVAL (10*USEC_PER_SEC)
65 #define DEFAULT_RATE_LIMIT_BURST 200
67 #define RECHECK_AVAILABLE_SPACE_USEC (30*USEC_PER_SEC)
69 #define RECHECK_VAR_AVAILABLE_USEC (30*USEC_PER_SEC)
71 #define N_IOVEC_META_FIELDS 17
73 #define ENTRY_SIZE_MAX (1024*1024*32)
75 typedef enum StdoutStreamState {
76 STDOUT_STREAM_IDENTIFIER,
77 STDOUT_STREAM_PRIORITY,
78 STDOUT_STREAM_LEVEL_PREFIX,
79 STDOUT_STREAM_FORWARD_TO_SYSLOG,
80 STDOUT_STREAM_FORWARD_TO_KMSG,
81 STDOUT_STREAM_FORWARD_TO_CONSOLE,
87 StdoutStreamState state;
93 security_context_t security_context;
99 bool forward_to_syslog:1;
100 bool forward_to_kmsg:1;
101 bool forward_to_console:1;
103 char buffer[LINE_MAX+1];
106 LIST_FIELDS(StdoutStream, stdout_stream);
109 static int server_flush_to_var(Server *s);
111 static uint64_t available_space(Server *s) {
116 uint64_t sum = 0, avail = 0, ss_avail = 0;
122 ts = now(CLOCK_MONOTONIC);
124 if (s->cached_available_space_timestamp + RECHECK_AVAILABLE_SPACE_USEC > ts)
125 return s->cached_available_space;
127 r = sd_id128_get_machine(&machine);
131 if (s->system_journal) {
132 f = "/var/log/journal/";
133 m = &s->system_metrics;
135 f = "/run/log/journal/";
136 m = &s->runtime_metrics;
141 p = strappend(f, sd_id128_to_string(machine, ids));
151 if (fstatvfs(dirfd(d), &ss) < 0)
156 struct dirent buf, *de;
159 k = readdir_r(d, &buf, &de);
168 if (!endswith(de->d_name, ".journal") &&
169 !endswith(de->d_name, ".journal~"))
172 if (fstatat(dirfd(d), de->d_name, &st, AT_SYMLINK_NOFOLLOW) < 0)
175 if (!S_ISREG(st.st_mode))
178 sum += (uint64_t) st.st_blocks * 512UL;
181 avail = sum >= m->max_use ? 0 : m->max_use - sum;
183 ss_avail = ss.f_bsize * ss.f_bavail;
185 ss_avail = ss_avail < m->keep_free ? 0 : ss_avail - m->keep_free;
187 if (ss_avail < avail)
190 s->cached_available_space = avail;
191 s->cached_available_space_timestamp = ts;
199 static void server_read_file_gid(Server *s) {
200 const char *adm = "adm";
205 if (s->file_gid_valid)
208 r = get_group_creds(&adm, &s->file_gid);
210 log_warning("Failed to resolve 'adm' group: %s", strerror(-r));
212 /* if we couldn't read the gid, then it will be 0, but that's
213 * fine and we shouldn't try to resolve the group again, so
214 * let's just pretend it worked right-away. */
215 s->file_gid_valid = true;
218 static void server_fix_perms(Server *s, JournalFile *f, uid_t uid) {
223 acl_permset_t permset;
228 server_read_file_gid(s);
230 r = fchmod_and_fchown(f->fd, 0640, 0, s->file_gid);
232 log_warning("Failed to fix access mode/rights on %s, ignoring: %s", f->path, strerror(-r));
238 acl = acl_get_fd(f->fd);
240 log_warning("Failed to read ACL on %s, ignoring: %m", f->path);
244 r = acl_find_uid(acl, uid, &entry);
247 if (acl_create_entry(&acl, &entry) < 0 ||
248 acl_set_tag_type(entry, ACL_USER) < 0 ||
249 acl_set_qualifier(entry, &uid) < 0) {
250 log_warning("Failed to patch ACL on %s, ignoring: %m", f->path);
255 if (acl_get_permset(entry, &permset) < 0 ||
256 acl_add_perm(permset, ACL_READ) < 0 ||
257 acl_calc_mask(&acl) < 0) {
258 log_warning("Failed to patch ACL on %s, ignoring: %m", f->path);
262 if (acl_set_fd(f->fd, acl) < 0)
263 log_warning("Failed to set ACL on %s, ignoring: %m", f->path);
270 static JournalFile* find_journal(Server *s, uid_t uid) {
279 /* We split up user logs only on /var, not on /run. If the
280 * runtime file is open, we write to it exclusively, in order
281 * to guarantee proper order as soon as we flush /run to
282 * /var and close the runtime file. */
284 if (s->runtime_journal)
285 return s->runtime_journal;
288 return s->system_journal;
290 r = sd_id128_get_machine(&machine);
292 return s->system_journal;
294 f = hashmap_get(s->user_journals, UINT32_TO_PTR(uid));
298 if (asprintf(&p, "/var/log/journal/%s/user-%lu.journal", sd_id128_to_string(machine, ids), (unsigned long) uid) < 0)
299 return s->system_journal;
301 while (hashmap_size(s->user_journals) >= USER_JOURNALS_MAX) {
302 /* Too many open? Then let's close one */
303 f = hashmap_steal_first(s->user_journals);
305 journal_file_close(f);
308 r = journal_file_open_reliably(p, O_RDWR|O_CREAT, 0640, s->system_journal, &f);
312 return s->system_journal;
314 server_fix_perms(s, f, uid);
316 r = hashmap_put(s->user_journals, UINT32_TO_PTR(uid), f);
318 journal_file_close(f);
319 return s->system_journal;
325 static void server_rotate(Server *s) {
331 log_info("Rotating...");
333 if (s->runtime_journal) {
334 r = journal_file_rotate(&s->runtime_journal);
336 log_error("Failed to rotate %s: %s", s->runtime_journal->path, strerror(-r));
338 server_fix_perms(s, s->runtime_journal, 0);
341 if (s->system_journal) {
342 r = journal_file_rotate(&s->system_journal);
344 log_error("Failed to rotate %s: %s", s->system_journal->path, strerror(-r));
346 server_fix_perms(s, s->system_journal, 0);
349 HASHMAP_FOREACH_KEY(f, k, s->user_journals, i) {
350 r = journal_file_rotate(&f);
352 log_error("Failed to rotate %s: %s", f->path, strerror(-r));
354 hashmap_replace(s->user_journals, k, f);
355 server_fix_perms(s, s->system_journal, PTR_TO_UINT32(k));
360 static void server_vacuum(Server *s) {
366 log_info("Vacuuming...");
368 r = sd_id128_get_machine(&machine);
370 log_error("Failed to get machine ID: %s", strerror(-r));
374 sd_id128_to_string(machine, ids);
376 if (s->system_journal) {
377 if (asprintf(&p, "/var/log/journal/%s", ids) < 0) {
378 log_error("Out of memory.");
382 r = journal_directory_vacuum(p, s->system_metrics.max_use, s->system_metrics.keep_free);
383 if (r < 0 && r != -ENOENT)
384 log_error("Failed to vacuum %s: %s", p, strerror(-r));
389 if (s->runtime_journal) {
390 if (asprintf(&p, "/run/log/journal/%s", ids) < 0) {
391 log_error("Out of memory.");
395 r = journal_directory_vacuum(p, s->runtime_metrics.max_use, s->runtime_metrics.keep_free);
396 if (r < 0 && r != -ENOENT)
397 log_error("Failed to vacuum %s: %s", p, strerror(-r));
401 s->cached_available_space_timestamp = 0;
404 static char *shortened_cgroup_path(pid_t pid) {
406 char *process_path, *init_path, *path;
410 r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, pid, &process_path);
414 r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, 1, &init_path);
420 if (endswith(init_path, "/system"))
421 init_path[strlen(init_path) - 7] = 0;
422 else if (streq(init_path, "/"))
425 if (startswith(process_path, init_path)) {
428 p = strdup(process_path + strlen(init_path));
446 static void dispatch_message_real(
448 struct iovec *iovec, unsigned n, unsigned m,
451 const char *label, size_t label_len) {
453 char *pid = NULL, *uid = NULL, *gid = NULL,
454 *source_time = NULL, *boot_id = NULL, *machine_id = NULL,
455 *comm = NULL, *cmdline = NULL, *hostname = NULL,
456 *audit_session = NULL, *audit_loginuid = NULL,
457 *exe = NULL, *cgroup = NULL, *session = NULL,
458 *owner_uid = NULL, *unit = NULL, *selinux_context = NULL;
464 uid_t loginuid = 0, realuid = 0;
466 bool vacuumed = false;
471 assert(n + N_IOVEC_META_FIELDS <= m);
477 realuid = ucred->uid;
479 if (asprintf(&pid, "_PID=%lu", (unsigned long) ucred->pid) >= 0)
480 IOVEC_SET_STRING(iovec[n++], pid);
482 if (asprintf(&uid, "_UID=%lu", (unsigned long) ucred->uid) >= 0)
483 IOVEC_SET_STRING(iovec[n++], uid);
485 if (asprintf(&gid, "_GID=%lu", (unsigned long) ucred->gid) >= 0)
486 IOVEC_SET_STRING(iovec[n++], gid);
488 r = get_process_comm(ucred->pid, &t);
490 comm = strappend("_COMM=", t);
494 IOVEC_SET_STRING(iovec[n++], comm);
497 r = get_process_exe(ucred->pid, &t);
499 exe = strappend("_EXE=", t);
503 IOVEC_SET_STRING(iovec[n++], exe);
506 r = get_process_cmdline(ucred->pid, LINE_MAX, false, &t);
508 cmdline = strappend("_CMDLINE=", t);
512 IOVEC_SET_STRING(iovec[n++], cmdline);
515 r = audit_session_from_pid(ucred->pid, &audit);
517 if (asprintf(&audit_session, "_AUDIT_SESSION=%lu", (unsigned long) audit) >= 0)
518 IOVEC_SET_STRING(iovec[n++], audit_session);
520 r = audit_loginuid_from_pid(ucred->pid, &loginuid);
522 if (asprintf(&audit_loginuid, "_AUDIT_LOGINUID=%lu", (unsigned long) loginuid) >= 0)
523 IOVEC_SET_STRING(iovec[n++], audit_loginuid);
525 t = shortened_cgroup_path(ucred->pid);
527 cgroup = strappend("_SYSTEMD_CGROUP=", t);
531 IOVEC_SET_STRING(iovec[n++], cgroup);
534 if (sd_pid_get_session(ucred->pid, &t) >= 0) {
535 session = strappend("_SYSTEMD_SESSION=", t);
539 IOVEC_SET_STRING(iovec[n++], session);
542 if (sd_pid_get_unit(ucred->pid, &t) >= 0) {
543 unit = strappend("_SYSTEMD_UNIT=", t);
547 IOVEC_SET_STRING(iovec[n++], unit);
550 if (sd_pid_get_owner_uid(ucred->uid, &owner) >= 0)
551 if (asprintf(&owner_uid, "_SYSTEMD_OWNER_UID=%lu", (unsigned long) owner) >= 0)
552 IOVEC_SET_STRING(iovec[n++], owner_uid);
556 selinux_context = malloc(sizeof("_SELINUX_CONTEXT=") + label_len);
557 if (selinux_context) {
558 memcpy(selinux_context, "_SELINUX_CONTEXT=", sizeof("_SELINUX_CONTEXT=")-1);
559 memcpy(selinux_context+sizeof("_SELINUX_CONTEXT=")-1, label, label_len);
560 selinux_context[sizeof("_SELINUX_CONTEXT=")-1+label_len] = 0;
561 IOVEC_SET_STRING(iovec[n++], selinux_context);
564 security_context_t con;
566 if (getpidcon(ucred->pid, &con) >= 0) {
567 selinux_context = strappend("_SELINUX_CONTEXT=", con);
569 IOVEC_SET_STRING(iovec[n++], selinux_context);
578 if (asprintf(&source_time, "_SOURCE_REALTIME_TIMESTAMP=%llu",
579 (unsigned long long) timeval_load(tv)) >= 0)
580 IOVEC_SET_STRING(iovec[n++], source_time);
583 /* Note that strictly speaking storing the boot id here is
584 * redundant since the entry includes this in-line
585 * anyway. However, we need this indexed, too. */
586 r = sd_id128_get_boot(&id);
588 if (asprintf(&boot_id, "_BOOT_ID=%s", sd_id128_to_string(id, idbuf)) >= 0)
589 IOVEC_SET_STRING(iovec[n++], boot_id);
591 r = sd_id128_get_machine(&id);
593 if (asprintf(&machine_id, "_MACHINE_ID=%s", sd_id128_to_string(id, idbuf)) >= 0)
594 IOVEC_SET_STRING(iovec[n++], machine_id);
596 t = gethostname_malloc();
598 hostname = strappend("_HOSTNAME=", t);
601 IOVEC_SET_STRING(iovec[n++], hostname);
606 server_flush_to_var(s);
609 f = find_journal(s, realuid == 0 ? 0 : loginuid);
611 log_warning("Dropping message, as we can't find a place to store the data.");
613 r = journal_file_append_entry(f, NULL, iovec, n, &s->seqnum, NULL, NULL);
615 if ((r == -EBADMSG || r == -E2BIG) && !vacuumed) {
618 log_info("Allocation limit reached, rotating.");
620 log_warning("Journal file corrupted, rotating.");
626 log_info("Retrying write.");
631 log_error("Failed to write entry, ignoring: %s", strerror(-r));
645 free(audit_loginuid);
650 free(selinux_context);
653 static void driver_message(Server *s, sd_id128_t message_id, const char *format, ...) {
654 char mid[11 + 32 + 1];
655 char buffer[16 + LINE_MAX + 1];
656 struct iovec iovec[N_IOVEC_META_FIELDS + 4];
664 IOVEC_SET_STRING(iovec[n++], "PRIORITY=5");
665 IOVEC_SET_STRING(iovec[n++], "_TRANSPORT=driver");
667 memcpy(buffer, "MESSAGE=", 8);
668 va_start(ap, format);
669 vsnprintf(buffer + 8, sizeof(buffer) - 8, format, ap);
671 char_array_0(buffer);
672 IOVEC_SET_STRING(iovec[n++], buffer);
674 snprintf(mid, sizeof(mid), "MESSAGE_ID=" SD_ID128_FORMAT_STR, SD_ID128_FORMAT_VAL(message_id));
676 IOVEC_SET_STRING(iovec[n++], mid);
679 ucred.pid = getpid();
680 ucred.uid = getuid();
681 ucred.gid = getgid();
683 dispatch_message_real(s, iovec, n, ELEMENTSOF(iovec), &ucred, NULL, NULL, 0);
686 static void dispatch_message(Server *s,
687 struct iovec *iovec, unsigned n, unsigned m,
690 const char *label, size_t label_len,
693 char *path = NULL, *c;
696 assert(iovec || n == 0);
704 path = shortened_cgroup_path(ucred->pid);
708 /* example: /user/lennart/3/foobar
709 * /system/dbus.service/foobar
711 * So let's cut of everything past the third /, since that is
712 * wher user directories start */
714 c = strchr(path, '/');
716 c = strchr(c+1, '/');
718 c = strchr(c+1, '/');
724 rl = journal_rate_limit_test(s->rate_limit, path, priority & LOG_PRIMASK, available_space(s));
731 /* Write a suppression message if we suppressed something */
733 driver_message(s, SD_MESSAGE_JOURNAL_DROPPED, "Suppressed %u messages from %s", rl - 1, path);
738 dispatch_message_real(s, iovec, n, m, ucred, tv, label, label_len);
741 static void forward_syslog_iovec(Server *s, const struct iovec *iovec, unsigned n_iovec, struct ucred *ucred, struct timeval *tv) {
742 struct msghdr msghdr;
743 struct cmsghdr *cmsg;
745 struct cmsghdr cmsghdr;
746 uint8_t buf[CMSG_SPACE(sizeof(struct ucred))];
748 union sockaddr_union sa;
755 msghdr.msg_iov = (struct iovec*) iovec;
756 msghdr.msg_iovlen = n_iovec;
759 sa.un.sun_family = AF_UNIX;
760 strncpy(sa.un.sun_path, "/run/systemd/journal/syslog", sizeof(sa.un.sun_path));
761 msghdr.msg_name = &sa;
762 msghdr.msg_namelen = offsetof(union sockaddr_union, un.sun_path) + strlen(sa.un.sun_path);
766 msghdr.msg_control = &control;
767 msghdr.msg_controllen = sizeof(control);
769 cmsg = CMSG_FIRSTHDR(&msghdr);
770 cmsg->cmsg_level = SOL_SOCKET;
771 cmsg->cmsg_type = SCM_CREDENTIALS;
772 cmsg->cmsg_len = CMSG_LEN(sizeof(struct ucred));
773 memcpy(CMSG_DATA(cmsg), ucred, sizeof(struct ucred));
774 msghdr.msg_controllen = cmsg->cmsg_len;
777 /* Forward the syslog message we received via /dev/log to
778 * /run/systemd/syslog. Unfortunately we currently can't set
779 * the SO_TIMESTAMP auxiliary data, and hence we don't. */
781 if (sendmsg(s->syslog_fd, &msghdr, MSG_NOSIGNAL) >= 0)
784 /* The socket is full? I guess the syslog implementation is
785 * too slow, and we shouldn't wait for that... */
789 if (ucred && errno == ESRCH) {
792 /* Hmm, presumably the sender process vanished
793 * by now, so let's fix it as good as we
798 memcpy(CMSG_DATA(cmsg), &u, sizeof(struct ucred));
800 if (sendmsg(s->syslog_fd, &msghdr, MSG_NOSIGNAL) >= 0)
807 log_debug("Failed to forward syslog message: %m");
810 static void forward_syslog_raw(Server *s, const char *buffer, struct ucred *ucred, struct timeval *tv) {
816 IOVEC_SET_STRING(iovec, buffer);
817 forward_syslog_iovec(s, &iovec, 1, ucred, tv);
820 static void forward_syslog(Server *s, int priority, const char *identifier, const char *message, struct ucred *ucred, struct timeval *tv) {
821 struct iovec iovec[5];
822 char header_priority[6], header_time[64], header_pid[16];
826 char *ident_buf = NULL;
829 assert(priority >= 0);
830 assert(priority <= 999);
833 /* First: priority field */
834 snprintf(header_priority, sizeof(header_priority), "<%i>", priority);
835 char_array_0(header_priority);
836 IOVEC_SET_STRING(iovec[n++], header_priority);
838 /* Second: timestamp */
839 t = tv ? tv->tv_sec : ((time_t) (now(CLOCK_REALTIME) / USEC_PER_SEC));
843 if (strftime(header_time, sizeof(header_time), "%h %e %T ", tm) <= 0)
845 IOVEC_SET_STRING(iovec[n++], header_time);
847 /* Third: identifier and PID */
850 get_process_comm(ucred->pid, &ident_buf);
851 identifier = ident_buf;
854 snprintf(header_pid, sizeof(header_pid), "[%lu]: ", (unsigned long) ucred->pid);
855 char_array_0(header_pid);
858 IOVEC_SET_STRING(iovec[n++], identifier);
860 IOVEC_SET_STRING(iovec[n++], header_pid);
861 } else if (identifier) {
862 IOVEC_SET_STRING(iovec[n++], identifier);
863 IOVEC_SET_STRING(iovec[n++], ": ");
866 /* Fourth: message */
867 IOVEC_SET_STRING(iovec[n++], message);
869 forward_syslog_iovec(s, iovec, n, ucred, tv);
874 static int fixup_priority(int priority) {
876 if ((priority & LOG_FACMASK) == 0)
877 return (priority & LOG_PRIMASK) | LOG_USER;
882 static void forward_kmsg(Server *s, int priority, const char *identifier, const char *message, struct ucred *ucred) {
883 struct iovec iovec[5];
884 char header_priority[6], header_pid[16];
886 char *ident_buf = NULL;
890 assert(priority >= 0);
891 assert(priority <= 999);
894 /* Never allow messages with kernel facility to be written to
895 * kmsg, regardless where the data comes from. */
896 priority = fixup_priority(priority);
898 /* First: priority field */
899 snprintf(header_priority, sizeof(header_priority), "<%i>", priority);
900 char_array_0(header_priority);
901 IOVEC_SET_STRING(iovec[n++], header_priority);
903 /* Second: identifier and PID */
906 get_process_comm(ucred->pid, &ident_buf);
907 identifier = ident_buf;
910 snprintf(header_pid, sizeof(header_pid), "[%lu]: ", (unsigned long) ucred->pid);
911 char_array_0(header_pid);
914 IOVEC_SET_STRING(iovec[n++], identifier);
916 IOVEC_SET_STRING(iovec[n++], header_pid);
917 } else if (identifier) {
918 IOVEC_SET_STRING(iovec[n++], identifier);
919 IOVEC_SET_STRING(iovec[n++], ": ");
922 /* Fourth: message */
923 IOVEC_SET_STRING(iovec[n++], message);
924 IOVEC_SET_STRING(iovec[n++], "\n");
926 fd = open("/dev/kmsg", O_WRONLY|O_NOCTTY|O_CLOEXEC);
928 log_debug("Failed to open /dev/kmsg for logging: %s", strerror(errno));
932 if (writev(fd, iovec, n) < 0)
933 log_debug("Failed to write to /dev/kmsg for logging: %s", strerror(errno));
935 close_nointr_nofail(fd);
941 static void forward_console(Server *s, const char *identifier, const char *message, struct ucred *ucred) {
942 struct iovec iovec[4];
945 char *ident_buf = NULL;
950 /* First: identifier and PID */
953 get_process_comm(ucred->pid, &ident_buf);
954 identifier = ident_buf;
957 snprintf(header_pid, sizeof(header_pid), "[%lu]: ", (unsigned long) ucred->pid);
958 char_array_0(header_pid);
961 IOVEC_SET_STRING(iovec[n++], identifier);
963 IOVEC_SET_STRING(iovec[n++], header_pid);
964 } else if (identifier) {
965 IOVEC_SET_STRING(iovec[n++], identifier);
966 IOVEC_SET_STRING(iovec[n++], ": ");
970 IOVEC_SET_STRING(iovec[n++], message);
971 IOVEC_SET_STRING(iovec[n++], "\n");
973 fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC);
975 log_debug("Failed to open /dev/console for logging: %s", strerror(errno));
979 if (writev(fd, iovec, n) < 0)
980 log_debug("Failed to write to /dev/console for logging: %s", strerror(errno));
982 close_nointr_nofail(fd);
988 static void read_identifier(const char **buf, char **identifier, char **pid) {
999 p += strspn(p, WHITESPACE);
1000 l = strcspn(p, WHITESPACE);
1009 if (p[l-1] == ']') {
1015 t = strndup(p+k+1, l-k-2);
1035 *buf += strspn(*buf, WHITESPACE);
1038 static void process_syslog_message(Server *s, const char *buf, struct ucred *ucred, struct timeval *tv, const char *label, size_t label_len) {
1039 char *message = NULL, *syslog_priority = NULL, *syslog_facility = NULL, *syslog_identifier = NULL, *syslog_pid = NULL;
1040 struct iovec iovec[N_IOVEC_META_FIELDS + 6];
1042 int priority = LOG_USER | LOG_INFO;
1043 char *identifier = NULL, *pid = NULL;
1048 if (s->forward_to_syslog)
1049 forward_syslog_raw(s, buf, ucred, tv);
1051 parse_syslog_priority((char**) &buf, &priority);
1052 skip_syslog_date((char**) &buf);
1053 read_identifier(&buf, &identifier, &pid);
1055 if (s->forward_to_kmsg)
1056 forward_kmsg(s, priority, identifier, buf, ucred);
1058 if (s->forward_to_console)
1059 forward_console(s, identifier, buf, ucred);
1061 IOVEC_SET_STRING(iovec[n++], "_TRANSPORT=syslog");
1063 if (asprintf(&syslog_priority, "PRIORITY=%i", priority & LOG_PRIMASK) >= 0)
1064 IOVEC_SET_STRING(iovec[n++], syslog_priority);
1066 if (priority & LOG_FACMASK)
1067 if (asprintf(&syslog_facility, "SYSLOG_FACILITY=%i", LOG_FAC(priority)) >= 0)
1068 IOVEC_SET_STRING(iovec[n++], syslog_facility);
1071 syslog_identifier = strappend("SYSLOG_IDENTIFIER=", identifier);
1072 if (syslog_identifier)
1073 IOVEC_SET_STRING(iovec[n++], syslog_identifier);
1077 syslog_pid = strappend("SYSLOG_PID=", pid);
1079 IOVEC_SET_STRING(iovec[n++], syslog_pid);
1082 message = strappend("MESSAGE=", buf);
1084 IOVEC_SET_STRING(iovec[n++], message);
1086 dispatch_message(s, iovec, n, ELEMENTSOF(iovec), ucred, tv, label, label_len, priority);
1091 free(syslog_priority);
1092 free(syslog_facility);
1093 free(syslog_identifier);
1096 static bool valid_user_field(const char *p, size_t l) {
1099 /* We kinda enforce POSIX syntax recommendations for
1100 environment variables here, but make a couple of additional
1103 http://pubs.opengroup.org/onlinepubs/000095399/basedefs/xbd_chap08.html */
1105 /* No empty field names */
1109 /* Don't allow names longer than 64 chars */
1113 /* Variables starting with an underscore are protected */
1117 /* Don't allow digits as first character */
1118 if (p[0] >= '0' && p[0] <= '9')
1121 /* Only allow A-Z0-9 and '_' */
1122 for (a = p; a < p + l; a++)
1123 if (!((*a >= 'A' && *a <= 'Z') ||
1124 (*a >= '0' && *a <= '9') ||
1131 static void process_native_message(
1133 const void *buffer, size_t buffer_size,
1134 struct ucred *ucred,
1136 const char *label, size_t label_len) {
1138 struct iovec *iovec = NULL;
1139 unsigned n = 0, m = 0, j, tn = (unsigned) -1;
1142 int priority = LOG_INFO;
1143 char *identifier = NULL, *message = NULL;
1146 assert(buffer || n == 0);
1149 remaining = buffer_size;
1151 while (remaining > 0) {
1154 e = memchr(p, '\n', remaining);
1157 /* Trailing noise, let's ignore it, and flush what we collected */
1158 log_debug("Received message with trailing noise, ignoring.");
1163 /* Entry separator */
1164 dispatch_message(s, iovec, n, m, ucred, tv, label, label_len, priority);
1166 priority = LOG_INFO;
1173 if (*p == '.' || *p == '#') {
1174 /* Ignore control commands for now, and
1176 remaining -= (e - p) + 1;
1181 /* A property follows */
1183 if (n+N_IOVEC_META_FIELDS >= m) {
1187 u = MAX((n+N_IOVEC_META_FIELDS+1) * 2U, 4U);
1188 c = realloc(iovec, u * sizeof(struct iovec));
1190 log_error("Out of memory");
1198 q = memchr(p, '=', e - p);
1200 if (valid_user_field(p, q - p)) {
1205 /* If the field name starts with an
1206 * underscore, skip the variable,
1207 * since that indidates a trusted
1209 iovec[n].iov_base = (char*) p;
1210 iovec[n].iov_len = l;
1213 /* We need to determine the priority
1214 * of this entry for the rate limiting
1217 memcmp(p, "PRIORITY=", 9) == 0 &&
1218 p[9] >= '0' && p[9] <= '9')
1219 priority = (priority & LOG_FACMASK) | (p[9] - '0');
1222 memcmp(p, "SYSLOG_FACILITY=", 16) == 0 &&
1223 p[16] >= '0' && p[16] <= '9')
1224 priority = (priority & LOG_PRIMASK) | ((p[16] - '0') << 3);
1227 memcmp(p, "SYSLOG_FACILITY=", 16) == 0 &&
1228 p[16] >= '0' && p[16] <= '9' &&
1229 p[17] >= '0' && p[17] <= '9')
1230 priority = (priority & LOG_PRIMASK) | (((p[16] - '0')*10 + (p[17] - '0')) << 3);
1233 memcmp(p, "SYSLOG_IDENTIFIER=", 11) == 0) {
1236 t = strndup(p + 11, l - 11);
1241 } else if (l >= 8 &&
1242 memcmp(p, "MESSAGE=", 8) == 0) {
1245 t = strndup(p + 8, l - 8);
1253 remaining -= (e - p) + 1;
1260 if (remaining < e - p + 1 + sizeof(uint64_t) + 1) {
1261 log_debug("Failed to parse message, ignoring.");
1265 memcpy(&l, e + 1, sizeof(uint64_t));
1268 if (remaining < e - p + 1 + sizeof(uint64_t) + l + 1 ||
1269 e[1+sizeof(uint64_t)+l] != '\n') {
1270 log_debug("Failed to parse message, ignoring.");
1274 k = malloc((e - p) + 1 + l);
1276 log_error("Out of memory");
1280 memcpy(k, p, e - p);
1282 memcpy(k + (e - p) + 1, e + 1 + sizeof(uint64_t), l);
1284 if (valid_user_field(p, e - p)) {
1285 iovec[n].iov_base = k;
1286 iovec[n].iov_len = (e - p) + 1 + l;
1291 remaining -= (e - p) + 1 + sizeof(uint64_t) + l + 1;
1292 p = e + 1 + sizeof(uint64_t) + l + 1;
1300 IOVEC_SET_STRING(iovec[tn], "_TRANSPORT=journal");
1303 if (s->forward_to_syslog)
1304 forward_syslog(s, priority, identifier, message, ucred, tv);
1306 if (s->forward_to_kmsg)
1307 forward_kmsg(s, priority, identifier, message, ucred);
1309 if (s->forward_to_console)
1310 forward_console(s, identifier, message, ucred);
1313 dispatch_message(s, iovec, n, m, ucred, tv, label, label_len, priority);
1316 for (j = 0; j < n; j++) {
1320 if (iovec[j].iov_base < buffer ||
1321 (const uint8_t*) iovec[j].iov_base >= (const uint8_t*) buffer + buffer_size)
1322 free(iovec[j].iov_base);
1330 static void process_native_file(
1333 struct ucred *ucred,
1335 const char *label, size_t label_len) {
1344 /* Data is in the passed file, since it didn't fit in a
1345 * datagram. We can't map the file here, since clients might
1346 * then truncate it and trigger a SIGBUS for us. So let's
1347 * stupidly read it */
1349 if (fstat(fd, &st) < 0) {
1350 log_error("Failed to stat passed file, ignoring: %m");
1354 if (!S_ISREG(st.st_mode)) {
1355 log_error("File passed is not regular. Ignoring.");
1359 if (st.st_size <= 0)
1362 if (st.st_size > ENTRY_SIZE_MAX) {
1363 log_error("File passed too large. Ignoring.");
1367 p = malloc(st.st_size);
1369 log_error("Out of memory");
1373 n = pread(fd, p, st.st_size, 0);
1375 log_error("Failed to read file, ignoring: %s", strerror(-n));
1377 process_native_message(s, p, n, ucred, tv, label, label_len);
1382 static int stdout_stream_log(StdoutStream *s, const char *p) {
1383 struct iovec iovec[N_IOVEC_META_FIELDS + 5];
1384 char *message = NULL, *syslog_priority = NULL, *syslog_facility = NULL, *syslog_identifier = NULL;
1388 size_t label_len = 0;
1396 priority = s->priority;
1398 if (s->level_prefix)
1399 parse_syslog_priority((char**) &p, &priority);
1401 if (s->forward_to_syslog || s->server->forward_to_syslog)
1402 forward_syslog(s->server, fixup_priority(priority), s->identifier, p, &s->ucred, NULL);
1404 if (s->forward_to_kmsg || s->server->forward_to_kmsg)
1405 forward_kmsg(s->server, priority, s->identifier, p, &s->ucred);
1407 if (s->forward_to_console || s->server->forward_to_console)
1408 forward_console(s->server, s->identifier, p, &s->ucred);
1410 IOVEC_SET_STRING(iovec[n++], "_TRANSPORT=stdout");
1412 if (asprintf(&syslog_priority, "PRIORITY=%i", priority & LOG_PRIMASK) >= 0)
1413 IOVEC_SET_STRING(iovec[n++], syslog_priority);
1415 if (priority & LOG_FACMASK)
1416 if (asprintf(&syslog_facility, "SYSLOG_FACILITY=%i", LOG_FAC(priority)) >= 0)
1417 IOVEC_SET_STRING(iovec[n++], syslog_facility);
1419 if (s->identifier) {
1420 syslog_identifier = strappend("SYSLOG_IDENTIFIER=", s->identifier);
1421 if (syslog_identifier)
1422 IOVEC_SET_STRING(iovec[n++], syslog_identifier);
1425 message = strappend("MESSAGE=", p);
1427 IOVEC_SET_STRING(iovec[n++], message);
1430 if (s->security_context) {
1431 label = (char*) s->security_context;
1432 label_len = strlen((char*) s->security_context);
1436 dispatch_message(s->server, iovec, n, ELEMENTSOF(iovec), &s->ucred, NULL, label, label_len, priority);
1439 free(syslog_priority);
1440 free(syslog_facility);
1441 free(syslog_identifier);
1446 static int stdout_stream_line(StdoutStream *s, char *p) {
1456 case STDOUT_STREAM_IDENTIFIER:
1458 s->identifier = NULL;
1460 s->identifier = strdup(p);
1461 if (!s->identifier) {
1462 log_error("Out of memory");
1467 s->state = STDOUT_STREAM_PRIORITY;
1470 case STDOUT_STREAM_PRIORITY:
1471 r = safe_atoi(p, &s->priority);
1472 if (r < 0 || s->priority <= 0 || s->priority >= 999) {
1473 log_warning("Failed to parse log priority line.");
1477 s->state = STDOUT_STREAM_LEVEL_PREFIX;
1480 case STDOUT_STREAM_LEVEL_PREFIX:
1481 r = parse_boolean(p);
1483 log_warning("Failed to parse level prefix line.");
1487 s->level_prefix = !!r;
1488 s->state = STDOUT_STREAM_FORWARD_TO_SYSLOG;
1491 case STDOUT_STREAM_FORWARD_TO_SYSLOG:
1492 r = parse_boolean(p);
1494 log_warning("Failed to parse forward to syslog line.");
1498 s->forward_to_syslog = !!r;
1499 s->state = STDOUT_STREAM_FORWARD_TO_KMSG;
1502 case STDOUT_STREAM_FORWARD_TO_KMSG:
1503 r = parse_boolean(p);
1505 log_warning("Failed to parse copy to kmsg line.");
1509 s->forward_to_kmsg = !!r;
1510 s->state = STDOUT_STREAM_FORWARD_TO_CONSOLE;
1513 case STDOUT_STREAM_FORWARD_TO_CONSOLE:
1514 r = parse_boolean(p);
1516 log_warning("Failed to parse copy to console line.");
1520 s->forward_to_console = !!r;
1521 s->state = STDOUT_STREAM_RUNNING;
1524 case STDOUT_STREAM_RUNNING:
1525 return stdout_stream_log(s, p);
1528 assert_not_reached("Unknown stream state");
1531 static int stdout_stream_scan(StdoutStream *s, bool force_flush) {
1539 remaining = s->length;
1544 end = memchr(p, '\n', remaining);
1547 else if (remaining >= sizeof(s->buffer) - 1) {
1548 end = p + sizeof(s->buffer) - 1;
1555 r = stdout_stream_line(s, p);
1563 if (force_flush && remaining > 0) {
1565 r = stdout_stream_line(s, p);
1573 if (p > s->buffer) {
1574 memmove(s->buffer, p, remaining);
1575 s->length = remaining;
1581 static int stdout_stream_process(StdoutStream *s) {
1587 l = read(s->fd, s->buffer+s->length, sizeof(s->buffer)-1-s->length);
1590 if (errno == EAGAIN)
1593 log_warning("Failed to read from stream: %m");
1598 r = stdout_stream_scan(s, true);
1606 r = stdout_stream_scan(s, false);
1614 static void stdout_stream_free(StdoutStream *s) {
1618 assert(s->server->n_stdout_streams > 0);
1619 s->server->n_stdout_streams --;
1620 LIST_REMOVE(StdoutStream, stdout_stream, s->server->stdout_streams, s);
1625 epoll_ctl(s->server->epoll_fd, EPOLL_CTL_DEL, s->fd, NULL);
1627 close_nointr_nofail(s->fd);
1631 if (s->security_context)
1632 freecon(s->security_context);
1635 free(s->identifier);
1639 static int stdout_stream_new(Server *s) {
1640 StdoutStream *stream;
1643 struct epoll_event ev;
1647 fd = accept4(s->stdout_fd, NULL, NULL, SOCK_NONBLOCK|SOCK_CLOEXEC);
1649 if (errno == EAGAIN)
1652 log_error("Failed to accept stdout connection: %m");
1656 if (s->n_stdout_streams >= STDOUT_STREAMS_MAX) {
1657 log_warning("Too many stdout streams, refusing connection.");
1658 close_nointr_nofail(fd);
1662 stream = new0(StdoutStream, 1);
1664 log_error("Out of memory.");
1665 close_nointr_nofail(fd);
1671 len = sizeof(stream->ucred);
1672 if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &stream->ucred, &len) < 0) {
1673 log_error("Failed to determine peer credentials: %m");
1679 if (getpeercon(fd, &stream->security_context) < 0)
1680 log_error("Failed to determine peer security context.");
1683 if (shutdown(fd, SHUT_WR) < 0) {
1684 log_error("Failed to shutdown writing side of socket: %m");
1690 ev.data.ptr = stream;
1691 ev.events = EPOLLIN;
1692 if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0) {
1693 log_error("Failed to add stream to event loop: %m");
1699 LIST_PREPEND(StdoutStream, stdout_stream, s->stdout_streams, stream);
1700 s->n_stdout_streams ++;
1705 stdout_stream_free(stream);
1709 static int parse_kernel_timestamp(char **_p, usec_t *t) {
1720 if (strlen(p) < 14 || p[0] != '[' || p[13] != ']' || p[6] != '.')
1725 for (i = 1; i <= 5; i++) {
1731 k = undecchar(p[i]);
1738 for (i = 7; i <= 12; i++) {
1741 k = undecchar(p[i]);
1750 *_p += strspn(*_p, WHITESPACE);
1755 static void proc_kmsg_line(Server *s, const char *p) {
1756 struct iovec iovec[N_IOVEC_META_FIELDS + 7];
1757 char *message = NULL, *syslog_priority = NULL, *syslog_pid = NULL, *syslog_facility = NULL, *syslog_identifier = NULL, *source_time = NULL;
1758 int priority = LOG_KERN | LOG_INFO;
1761 char *identifier = NULL, *pid = NULL;
1769 parse_syslog_priority((char **) &p, &priority);
1771 if (s->forward_to_kmsg && (priority & LOG_FACMASK) != LOG_KERN)
1774 if (parse_kernel_timestamp((char **) &p, &usec) > 0) {
1775 if (asprintf(&source_time, "_SOURCE_MONOTONIC_TIMESTAMP=%llu",
1776 (unsigned long long) usec) >= 0)
1777 IOVEC_SET_STRING(iovec[n++], source_time);
1780 IOVEC_SET_STRING(iovec[n++], "_TRANSPORT=kernel");
1782 if (asprintf(&syslog_priority, "PRIORITY=%i", priority & LOG_PRIMASK) >= 0)
1783 IOVEC_SET_STRING(iovec[n++], syslog_priority);
1785 if ((priority & LOG_FACMASK) == LOG_KERN) {
1787 if (s->forward_to_syslog)
1788 forward_syslog(s, priority, "kernel", p, NULL, NULL);
1790 IOVEC_SET_STRING(iovec[n++], "SYSLOG_IDENTIFIER=kernel");
1792 read_identifier(&p, &identifier, &pid);
1794 if (s->forward_to_syslog)
1795 forward_syslog(s, priority, identifier, p, NULL, NULL);
1798 syslog_identifier = strappend("SYSLOG_IDENTIFIER=", identifier);
1799 if (syslog_identifier)
1800 IOVEC_SET_STRING(iovec[n++], syslog_identifier);
1804 syslog_pid = strappend("SYSLOG_PID=", pid);
1806 IOVEC_SET_STRING(iovec[n++], syslog_pid);
1809 if (asprintf(&syslog_facility, "SYSLOG_FACILITY=%i", LOG_FAC(priority)) >= 0)
1810 IOVEC_SET_STRING(iovec[n++], syslog_facility);
1813 message = strappend("MESSAGE=", p);
1815 IOVEC_SET_STRING(iovec[n++], message);
1817 dispatch_message(s, iovec, n, ELEMENTSOF(iovec), NULL, NULL, NULL, 0, priority);
1820 free(syslog_priority);
1821 free(syslog_identifier);
1823 free(syslog_facility);
1829 static void proc_kmsg_scan(Server *s) {
1835 p = s->proc_kmsg_buffer;
1836 remaining = s->proc_kmsg_length;
1841 end = memchr(p, '\n', remaining);
1844 else if (remaining >= sizeof(s->proc_kmsg_buffer) - 1) {
1845 end = p + sizeof(s->proc_kmsg_buffer) - 1;
1852 proc_kmsg_line(s, p);
1858 if (p > s->proc_kmsg_buffer) {
1859 memmove(s->proc_kmsg_buffer, p, remaining);
1860 s->proc_kmsg_length = remaining;
1864 static int system_journal_open(Server *s) {
1870 r = sd_id128_get_machine(&machine);
1874 sd_id128_to_string(machine, ids);
1876 if (!s->system_journal) {
1878 /* First try to create the machine path, but not the prefix */
1879 fn = strappend("/var/log/journal/", ids);
1882 (void) mkdir(fn, 0755);
1885 /* The create the system journal file */
1886 fn = join("/var/log/journal/", ids, "/system.journal", NULL);
1890 r = journal_file_open_reliably(fn, O_RDWR|O_CREAT, 0640, NULL, &s->system_journal);
1894 journal_default_metrics(&s->system_metrics, s->system_journal->fd);
1896 s->system_journal->metrics = s->system_metrics;
1897 s->system_journal->compress = s->compress;
1899 server_fix_perms(s, s->system_journal, 0);
1902 if (r != -ENOENT && r != -EROFS)
1903 log_warning("Failed to open system journal: %s", strerror(-r));
1909 if (!s->runtime_journal) {
1911 fn = join("/run/log/journal/", ids, "/system.journal", NULL);
1915 if (s->system_journal) {
1917 /* Try to open the runtime journal, but only
1918 * if it already exists, so that we can flush
1919 * it into the system journal */
1921 r = journal_file_open(fn, O_RDWR, 0640, NULL, &s->runtime_journal);
1926 log_warning("Failed to open runtime journal: %s", strerror(-r));
1933 /* OK, we really need the runtime journal, so create
1934 * it if necessary. */
1936 (void) mkdir_parents(fn, 0755);
1937 r = journal_file_open_reliably(fn, O_RDWR|O_CREAT, 0640, NULL, &s->runtime_journal);
1941 log_error("Failed to open runtime journal: %s", strerror(-r));
1946 if (s->runtime_journal) {
1947 journal_default_metrics(&s->runtime_metrics, s->runtime_journal->fd);
1949 s->runtime_journal->metrics = s->runtime_metrics;
1950 s->runtime_journal->compress = s->compress;
1952 server_fix_perms(s, s->runtime_journal, 0);
1959 static int server_flush_to_var(Server *s) {
1960 char path[] = "/run/log/journal/xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
1969 if (!s->runtime_journal)
1972 ts = now(CLOCK_MONOTONIC);
1973 if (s->var_available_timestamp + RECHECK_VAR_AVAILABLE_USEC > ts)
1976 s->var_available_timestamp = ts;
1978 system_journal_open(s);
1980 if (!s->system_journal)
1983 log_info("Flushing to /var...");
1985 r = sd_id128_get_machine(&machine);
1987 log_error("Failed to get machine id: %s", strerror(-r));
1991 r = sd_journal_open(&j, SD_JOURNAL_RUNTIME_ONLY);
1993 log_error("Failed to read runtime journal: %s", strerror(-r));
1997 SD_JOURNAL_FOREACH(j) {
2000 f = j->current_file;
2001 assert(f && f->current_offset > 0);
2003 r = journal_file_move_to_object(f, OBJECT_ENTRY, f->current_offset, &o);
2005 log_error("Can't read entry: %s", strerror(-r));
2009 r = journal_file_copy_entry(f, s->system_journal, o, f->current_offset, NULL, NULL, NULL);
2011 log_info("Allocation limit reached.");
2013 journal_file_post_change(s->system_journal);
2017 r = journal_file_copy_entry(f, s->system_journal, o, f->current_offset, NULL, NULL, NULL);
2021 log_error("Can't write entry: %s", strerror(-r));
2027 journal_file_post_change(s->system_journal);
2029 journal_file_close(s->runtime_journal);
2030 s->runtime_journal = NULL;
2033 sd_id128_to_string(machine, path + 17);
2034 rm_rf(path, false, true, false);
2040 static int server_read_proc_kmsg(Server *s) {
2043 assert(s->proc_kmsg_fd >= 0);
2045 l = read(s->proc_kmsg_fd, s->proc_kmsg_buffer + s->proc_kmsg_length, sizeof(s->proc_kmsg_buffer) - 1 - s->proc_kmsg_length);
2048 if (errno == EAGAIN || errno == EINTR)
2051 log_error("Failed to read from kernel: %m");
2055 s->proc_kmsg_length += l;
2061 static int server_flush_proc_kmsg(Server *s) {
2066 if (s->proc_kmsg_fd < 0)
2069 log_info("Flushing /proc/kmsg...");
2072 r = server_read_proc_kmsg(s);
2083 static int process_event(Server *s, struct epoll_event *ev) {
2086 if (ev->data.fd == s->signal_fd) {
2087 struct signalfd_siginfo sfsi;
2090 if (ev->events != EPOLLIN) {
2091 log_info("Got invalid event from epoll.");
2095 n = read(s->signal_fd, &sfsi, sizeof(sfsi));
2096 if (n != sizeof(sfsi)) {
2101 if (errno == EINTR || errno == EAGAIN)
2107 if (sfsi.ssi_signo == SIGUSR1) {
2108 server_flush_to_var(s);
2112 log_debug("Received SIG%s", signal_to_string(sfsi.ssi_signo));
2115 } else if (ev->data.fd == s->proc_kmsg_fd) {
2118 if (ev->events != EPOLLIN) {
2119 log_info("Got invalid event from epoll.");
2123 r = server_read_proc_kmsg(s);
2129 } else if (ev->data.fd == s->native_fd ||
2130 ev->data.fd == s->syslog_fd) {
2132 if (ev->events != EPOLLIN) {
2133 log_info("Got invalid event from epoll.");
2138 struct msghdr msghdr;
2140 struct ucred *ucred = NULL;
2141 struct timeval *tv = NULL;
2142 struct cmsghdr *cmsg;
2144 size_t label_len = 0;
2146 struct cmsghdr cmsghdr;
2147 uint8_t buf[CMSG_SPACE(sizeof(struct ucred)) +
2148 CMSG_SPACE(sizeof(struct timeval)) +
2149 CMSG_SPACE(sizeof(int)) +
2150 CMSG_SPACE(PAGE_SIZE)]; /* selinux label */
2157 if (ioctl(ev->data.fd, SIOCINQ, &v) < 0) {
2158 log_error("SIOCINQ failed: %m");
2162 if (s->buffer_size < (size_t) v) {
2166 l = MAX(LINE_MAX + (size_t) v, s->buffer_size * 2);
2167 b = realloc(s->buffer, l+1);
2170 log_error("Couldn't increase buffer.");
2179 iovec.iov_base = s->buffer;
2180 iovec.iov_len = s->buffer_size;
2184 msghdr.msg_iov = &iovec;
2185 msghdr.msg_iovlen = 1;
2186 msghdr.msg_control = &control;
2187 msghdr.msg_controllen = sizeof(control);
2189 n = recvmsg(ev->data.fd, &msghdr, MSG_DONTWAIT|MSG_CMSG_CLOEXEC);
2192 if (errno == EINTR || errno == EAGAIN)
2195 log_error("recvmsg() failed: %m");
2199 for (cmsg = CMSG_FIRSTHDR(&msghdr); cmsg; cmsg = CMSG_NXTHDR(&msghdr, cmsg)) {
2201 if (cmsg->cmsg_level == SOL_SOCKET &&
2202 cmsg->cmsg_type == SCM_CREDENTIALS &&
2203 cmsg->cmsg_len == CMSG_LEN(sizeof(struct ucred)))
2204 ucred = (struct ucred*) CMSG_DATA(cmsg);
2205 else if (cmsg->cmsg_level == SOL_SOCKET &&
2206 cmsg->cmsg_type == SCM_SECURITY) {
2207 label = (char*) CMSG_DATA(cmsg);
2208 label_len = cmsg->cmsg_len - CMSG_LEN(0);
2209 } else if (cmsg->cmsg_level == SOL_SOCKET &&
2210 cmsg->cmsg_type == SO_TIMESTAMP &&
2211 cmsg->cmsg_len == CMSG_LEN(sizeof(struct timeval)))
2212 tv = (struct timeval*) CMSG_DATA(cmsg);
2213 else if (cmsg->cmsg_level == SOL_SOCKET &&
2214 cmsg->cmsg_type == SCM_RIGHTS) {
2215 fds = (int*) CMSG_DATA(cmsg);
2216 n_fds = (cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int);
2220 if (ev->data.fd == s->syslog_fd) {
2223 if (n > 0 && n_fds == 0) {
2224 e = memchr(s->buffer, '\n', n);
2230 process_syslog_message(s, strstrip(s->buffer), ucred, tv, label, label_len);
2231 } else if (n_fds > 0)
2232 log_warning("Got file descriptors via syslog socket. Ignoring.");
2235 if (n > 0 && n_fds == 0)
2236 process_native_message(s, s->buffer, n, ucred, tv, label, label_len);
2237 else if (n == 0 && n_fds == 1)
2238 process_native_file(s, fds[0], ucred, tv, label, label_len);
2240 log_warning("Got too many file descriptors via native socket. Ignoring.");
2243 close_many(fds, n_fds);
2248 } else if (ev->data.fd == s->stdout_fd) {
2250 if (ev->events != EPOLLIN) {
2251 log_info("Got invalid event from epoll.");
2255 stdout_stream_new(s);
2259 StdoutStream *stream;
2261 if ((ev->events|EPOLLIN|EPOLLHUP) != (EPOLLIN|EPOLLHUP)) {
2262 log_info("Got invalid event from epoll.");
2266 /* If it is none of the well-known fds, it must be an
2267 * stdout stream fd. Note that this is a bit ugly here
2268 * (since we rely that none of the well-known fds
2269 * could be interpreted as pointer), but nonetheless
2270 * safe, since the well-known fds would never get an
2271 * fd > 4096, i.e. beyond the first memory page */
2273 stream = ev->data.ptr;
2275 if (stdout_stream_process(stream) <= 0)
2276 stdout_stream_free(stream);
2281 log_error("Unknown event.");
2285 static int open_syslog_socket(Server *s) {
2286 union sockaddr_union sa;
2288 struct epoll_event ev;
2292 if (s->syslog_fd < 0) {
2294 s->syslog_fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
2295 if (s->syslog_fd < 0) {
2296 log_error("socket() failed: %m");
2301 sa.un.sun_family = AF_UNIX;
2302 strncpy(sa.un.sun_path, "/dev/log", sizeof(sa.un.sun_path));
2304 unlink(sa.un.sun_path);
2306 r = bind(s->syslog_fd, &sa.sa, offsetof(union sockaddr_union, un.sun_path) + strlen(sa.un.sun_path));
2308 log_error("bind() failed: %m");
2312 chmod(sa.un.sun_path, 0666);
2314 fd_nonblock(s->syslog_fd, 1);
2317 r = setsockopt(s->syslog_fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one));
2319 log_error("SO_PASSCRED failed: %m");
2325 r = setsockopt(s->syslog_fd, SOL_SOCKET, SO_PASSSEC, &one, sizeof(one));
2327 log_warning("SO_PASSSEC failed: %m");
2331 r = setsockopt(s->syslog_fd, SOL_SOCKET, SO_TIMESTAMP, &one, sizeof(one));
2333 log_error("SO_TIMESTAMP failed: %m");
2338 ev.events = EPOLLIN;
2339 ev.data.fd = s->syslog_fd;
2340 if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->syslog_fd, &ev) < 0) {
2341 log_error("Failed to add syslog server fd to epoll object: %m");
2348 static int open_native_socket(Server*s) {
2349 union sockaddr_union sa;
2351 struct epoll_event ev;
2355 if (s->native_fd < 0) {
2357 s->native_fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
2358 if (s->native_fd < 0) {
2359 log_error("socket() failed: %m");
2364 sa.un.sun_family = AF_UNIX;
2365 strncpy(sa.un.sun_path, "/run/systemd/journal/socket", sizeof(sa.un.sun_path));
2367 unlink(sa.un.sun_path);
2369 r = bind(s->native_fd, &sa.sa, offsetof(union sockaddr_union, un.sun_path) + strlen(sa.un.sun_path));
2371 log_error("bind() failed: %m");
2375 chmod(sa.un.sun_path, 0666);
2377 fd_nonblock(s->native_fd, 1);
2380 r = setsockopt(s->native_fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one));
2382 log_error("SO_PASSCRED failed: %m");
2388 r = setsockopt(s->syslog_fd, SOL_SOCKET, SO_PASSSEC, &one, sizeof(one));
2390 log_warning("SO_PASSSEC failed: %m");
2394 r = setsockopt(s->native_fd, SOL_SOCKET, SO_TIMESTAMP, &one, sizeof(one));
2396 log_error("SO_TIMESTAMP failed: %m");
2401 ev.events = EPOLLIN;
2402 ev.data.fd = s->native_fd;
2403 if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->native_fd, &ev) < 0) {
2404 log_error("Failed to add native server fd to epoll object: %m");
2411 static int open_stdout_socket(Server *s) {
2412 union sockaddr_union sa;
2414 struct epoll_event ev;
2418 if (s->stdout_fd < 0) {
2420 s->stdout_fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
2421 if (s->stdout_fd < 0) {
2422 log_error("socket() failed: %m");
2427 sa.un.sun_family = AF_UNIX;
2428 strncpy(sa.un.sun_path, "/run/systemd/journal/stdout", sizeof(sa.un.sun_path));
2430 unlink(sa.un.sun_path);
2432 r = bind(s->stdout_fd, &sa.sa, offsetof(union sockaddr_union, un.sun_path) + strlen(sa.un.sun_path));
2434 log_error("bind() failed: %m");
2438 chmod(sa.un.sun_path, 0666);
2440 if (listen(s->stdout_fd, SOMAXCONN) < 0) {
2441 log_error("liste() failed: %m");
2445 fd_nonblock(s->stdout_fd, 1);
2448 ev.events = EPOLLIN;
2449 ev.data.fd = s->stdout_fd;
2450 if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->stdout_fd, &ev) < 0) {
2451 log_error("Failed to add stdout server fd to epoll object: %m");
2458 static int open_proc_kmsg(Server *s) {
2459 struct epoll_event ev;
2463 if (!s->import_proc_kmsg)
2467 s->proc_kmsg_fd = open("/proc/kmsg", O_CLOEXEC|O_NONBLOCK|O_NOCTTY);
2468 if (s->proc_kmsg_fd < 0) {
2469 log_warning("Failed to open /proc/kmsg, ignoring: %m");
2474 ev.events = EPOLLIN;
2475 ev.data.fd = s->proc_kmsg_fd;
2476 if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->proc_kmsg_fd, &ev) < 0) {
2477 log_error("Failed to add /proc/kmsg fd to epoll object: %m");
2484 static int open_signalfd(Server *s) {
2486 struct epoll_event ev;
2490 assert_se(sigemptyset(&mask) == 0);
2491 sigset_add_many(&mask, SIGINT, SIGTERM, SIGUSR1, -1);
2492 assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
2494 s->signal_fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC);
2495 if (s->signal_fd < 0) {
2496 log_error("signalfd(): %m");
2501 ev.events = EPOLLIN;
2502 ev.data.fd = s->signal_fd;
2504 if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->signal_fd, &ev) < 0) {
2505 log_error("epoll_ctl(): %m");
2512 static int server_parse_proc_cmdline(Server *s) {
2513 char *line, *w, *state;
2517 if (detect_container(NULL) > 0)
2520 r = read_one_line_file("/proc/cmdline", &line);
2522 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
2526 FOREACH_WORD_QUOTED(w, l, line, state) {
2529 word = strndup(w, l);
2535 if (startswith(word, "systemd_journald.forward_to_syslog=")) {
2536 r = parse_boolean(word + 35);
2538 log_warning("Failed to parse forward to syslog switch %s. Ignoring.", word + 35);
2540 s->forward_to_syslog = r;
2541 } else if (startswith(word, "systemd_journald.forward_to_kmsg=")) {
2542 r = parse_boolean(word + 33);
2544 log_warning("Failed to parse forward to kmsg switch %s. Ignoring.", word + 33);
2546 s->forward_to_kmsg = r;
2547 } else if (startswith(word, "systemd_journald.forward_to_console=")) {
2548 r = parse_boolean(word + 36);
2550 log_warning("Failed to parse forward to console switch %s. Ignoring.", word + 36);
2552 s->forward_to_console = r;
2565 static int server_parse_config_file(Server *s) {
2572 fn = "/etc/systemd/systemd-journald.conf";
2573 f = fopen(fn, "re");
2575 if (errno == ENOENT)
2578 log_warning("Failed to open configuration file %s: %m", fn);
2582 r = config_parse(fn, f, "Journal\0", config_item_perf_lookup, (void*) journald_gperf_lookup, false, s);
2584 log_warning("Failed to parse configuration file: %s", strerror(-r));
2591 static int server_init(Server *s) {
2597 s->syslog_fd = s->native_fd = s->stdout_fd = s->signal_fd = s->epoll_fd = s->proc_kmsg_fd = -1;
2600 s->rate_limit_interval = DEFAULT_RATE_LIMIT_INTERVAL;
2601 s->rate_limit_burst = DEFAULT_RATE_LIMIT_BURST;
2603 s->forward_to_syslog = true;
2604 s->import_proc_kmsg = true;
2606 memset(&s->system_metrics, 0xFF, sizeof(s->system_metrics));
2607 memset(&s->runtime_metrics, 0xFF, sizeof(s->runtime_metrics));
2609 server_parse_config_file(s);
2610 server_parse_proc_cmdline(s);
2612 s->user_journals = hashmap_new(trivial_hash_func, trivial_compare_func);
2613 if (!s->user_journals) {
2614 log_error("Out of memory.");
2618 s->epoll_fd = epoll_create1(EPOLL_CLOEXEC);
2619 if (s->epoll_fd < 0) {
2620 log_error("Failed to create epoll object: %m");
2624 n = sd_listen_fds(true);
2626 log_error("Failed to read listening file descriptors from environment: %s", strerror(-n));
2630 for (fd = SD_LISTEN_FDS_START; fd < SD_LISTEN_FDS_START + n; fd++) {
2632 if (sd_is_socket_unix(fd, SOCK_DGRAM, -1, "/run/systemd/journal/socket", 0) > 0) {
2634 if (s->native_fd >= 0) {
2635 log_error("Too many native sockets passed.");
2641 } else if (sd_is_socket_unix(fd, SOCK_STREAM, 1, "/run/systemd/journal/stdout", 0) > 0) {
2643 if (s->stdout_fd >= 0) {
2644 log_error("Too many stdout sockets passed.");
2650 } else if (sd_is_socket_unix(fd, SOCK_DGRAM, -1, "/dev/log", 0) > 0) {
2652 if (s->syslog_fd >= 0) {
2653 log_error("Too many /dev/log sockets passed.");
2660 log_error("Unknown socket passed.");
2665 r = open_syslog_socket(s);
2669 r = open_native_socket(s);
2673 r = open_stdout_socket(s);
2677 r = open_proc_kmsg(s);
2681 r = open_signalfd(s);
2685 s->rate_limit = journal_rate_limit_new(s->rate_limit_interval, s->rate_limit_burst);
2689 r = system_journal_open(s);
2696 static void server_done(Server *s) {
2700 while (s->stdout_streams)
2701 stdout_stream_free(s->stdout_streams);
2703 if (s->system_journal)
2704 journal_file_close(s->system_journal);
2706 if (s->runtime_journal)
2707 journal_file_close(s->runtime_journal);
2709 while ((f = hashmap_steal_first(s->user_journals)))
2710 journal_file_close(f);
2712 hashmap_free(s->user_journals);
2714 if (s->epoll_fd >= 0)
2715 close_nointr_nofail(s->epoll_fd);
2717 if (s->signal_fd >= 0)
2718 close_nointr_nofail(s->signal_fd);
2720 if (s->syslog_fd >= 0)
2721 close_nointr_nofail(s->syslog_fd);
2723 if (s->native_fd >= 0)
2724 close_nointr_nofail(s->native_fd);
2726 if (s->stdout_fd >= 0)
2727 close_nointr_nofail(s->stdout_fd);
2729 if (s->proc_kmsg_fd >= 0)
2730 close_nointr_nofail(s->proc_kmsg_fd);
2733 journal_rate_limit_free(s->rate_limit);
2738 int main(int argc, char *argv[]) {
2742 /* if (getppid() != 1) { */
2743 /* log_error("This program should be invoked by init only."); */
2744 /* return EXIT_FAILURE; */
2748 log_error("This program does not take arguments.");
2749 return EXIT_FAILURE;
2752 log_set_target(LOG_TARGET_CONSOLE);
2753 log_parse_environment();
2758 r = server_init(&server);
2762 server_vacuum(&server);
2763 server_flush_to_var(&server);
2764 server_flush_proc_kmsg(&server);
2766 log_debug("systemd-journald running as pid %lu", (unsigned long) getpid());
2767 driver_message(&server, SD_MESSAGE_JOURNAL_START, "Journal started");
2771 "STATUS=Processing requests...");
2774 struct epoll_event event;
2776 r = epoll_wait(server.epoll_fd, &event, 1, -1);
2782 log_error("epoll_wait() failed: %m");
2788 r = process_event(&server, &event);
2795 log_debug("systemd-journald stopped as pid %lu", (unsigned long) getpid());
2796 driver_message(&server, SD_MESSAGE_JOURNAL_STOP, "Journal stopped");
2800 "STATUS=Shutting down...");
2802 server_done(&server);
2804 return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;