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 (!dirent_is_file_with_suffix(de, ".journal"))
171 if (fstatat(dirfd(d), de->d_name, &st, AT_SYMLINK_NOFOLLOW) < 0)
174 if (!S_ISREG(st.st_mode))
177 sum += (uint64_t) st.st_blocks * 512UL;
180 avail = sum >= m->max_use ? 0 : m->max_use - sum;
182 ss_avail = ss.f_bsize * ss.f_bavail;
184 ss_avail = ss_avail < m->keep_free ? 0 : ss_avail - m->keep_free;
186 if (ss_avail < avail)
189 s->cached_available_space = avail;
190 s->cached_available_space_timestamp = ts;
198 static void server_read_file_gid(Server *s) {
199 const char *adm = "adm";
204 if (s->file_gid_valid)
207 r = get_group_creds(&adm, &s->file_gid);
209 log_warning("Failed to resolve 'adm' group: %s", strerror(-r));
211 /* if we couldn't read the gid, then it will be 0, but that's
212 * fine and we shouldn't try to resolve the group again, so
213 * let's just pretend it worked right-away. */
214 s->file_gid_valid = true;
217 static void server_fix_perms(Server *s, JournalFile *f, uid_t uid) {
222 acl_permset_t permset;
227 server_read_file_gid(s);
229 r = fchmod_and_fchown(f->fd, 0640, 0, s->file_gid);
231 log_warning("Failed to fix access mode/rights on %s, ignoring: %s", f->path, strerror(-r));
237 acl = acl_get_fd(f->fd);
239 log_warning("Failed to read ACL on %s, ignoring: %m", f->path);
243 r = acl_find_uid(acl, uid, &entry);
246 if (acl_create_entry(&acl, &entry) < 0 ||
247 acl_set_tag_type(entry, ACL_USER) < 0 ||
248 acl_set_qualifier(entry, &uid) < 0) {
249 log_warning("Failed to patch ACL on %s, ignoring: %m", f->path);
254 if (acl_get_permset(entry, &permset) < 0 ||
255 acl_add_perm(permset, ACL_READ) < 0 ||
256 acl_calc_mask(&acl) < 0) {
257 log_warning("Failed to patch ACL on %s, ignoring: %m", f->path);
261 if (acl_set_fd(f->fd, acl) < 0)
262 log_warning("Failed to set ACL on %s, ignoring: %m", f->path);
269 static JournalFile* find_journal(Server *s, uid_t uid) {
278 /* We split up user logs only on /var, not on /run. If the
279 * runtime file is open, we write to it exclusively, in order
280 * to guarantee proper order as soon as we flush /run to
281 * /var and close the runtime file. */
283 if (s->runtime_journal)
284 return s->runtime_journal;
287 return s->system_journal;
289 r = sd_id128_get_machine(&machine);
291 return s->system_journal;
293 f = hashmap_get(s->user_journals, UINT32_TO_PTR(uid));
297 if (asprintf(&p, "/var/log/journal/%s/user-%lu.journal", sd_id128_to_string(machine, ids), (unsigned long) uid) < 0)
298 return s->system_journal;
300 while (hashmap_size(s->user_journals) >= USER_JOURNALS_MAX) {
301 /* Too many open? Then let's close one */
302 f = hashmap_steal_first(s->user_journals);
304 journal_file_close(f);
307 r = journal_file_open_reliably(p, O_RDWR|O_CREAT, 0640, s->system_journal, &f);
311 return s->system_journal;
313 server_fix_perms(s, f, uid);
315 r = hashmap_put(s->user_journals, UINT32_TO_PTR(uid), f);
317 journal_file_close(f);
318 return s->system_journal;
324 static void server_rotate(Server *s) {
330 log_info("Rotating...");
332 if (s->runtime_journal) {
333 r = journal_file_rotate(&s->runtime_journal);
335 log_error("Failed to rotate %s: %s", s->runtime_journal->path, strerror(-r));
338 if (s->system_journal) {
339 r = journal_file_rotate(&s->system_journal);
341 log_error("Failed to rotate %s: %s", s->system_journal->path, strerror(-r));
344 HASHMAP_FOREACH_KEY(f, k, s->user_journals, i) {
345 r = journal_file_rotate(&f);
347 log_error("Failed to rotate %s: %s", f->path, strerror(-r));
349 hashmap_replace(s->user_journals, k, f);
353 static void server_vacuum(Server *s) {
359 log_info("Vacuuming...");
361 r = sd_id128_get_machine(&machine);
363 log_error("Failed to get machine ID: %s", strerror(-r));
367 sd_id128_to_string(machine, ids);
369 if (s->system_journal) {
370 if (asprintf(&p, "/var/log/journal/%s", ids) < 0) {
371 log_error("Out of memory.");
375 r = journal_directory_vacuum(p, s->system_metrics.max_use, s->system_metrics.keep_free);
376 if (r < 0 && r != -ENOENT)
377 log_error("Failed to vacuum %s: %s", p, strerror(-r));
382 if (s->runtime_journal) {
383 if (asprintf(&p, "/run/log/journal/%s", ids) < 0) {
384 log_error("Out of memory.");
388 r = journal_directory_vacuum(p, s->runtime_metrics.max_use, s->runtime_metrics.keep_free);
389 if (r < 0 && r != -ENOENT)
390 log_error("Failed to vacuum %s: %s", p, strerror(-r));
394 s->cached_available_space_timestamp = 0;
397 static char *shortened_cgroup_path(pid_t pid) {
399 char *process_path, *init_path, *path;
403 r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, pid, &process_path);
407 r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, 1, &init_path);
413 if (endswith(init_path, "/system"))
414 init_path[strlen(init_path) - 7] = 0;
415 else if (streq(init_path, "/"))
418 if (startswith(process_path, init_path)) {
421 p = strdup(process_path + strlen(init_path));
439 static void dispatch_message_real(
441 struct iovec *iovec, unsigned n, unsigned m,
444 const char *label, size_t label_len) {
446 char *pid = NULL, *uid = NULL, *gid = NULL,
447 *source_time = NULL, *boot_id = NULL, *machine_id = NULL,
448 *comm = NULL, *cmdline = NULL, *hostname = NULL,
449 *audit_session = NULL, *audit_loginuid = NULL,
450 *exe = NULL, *cgroup = NULL, *session = NULL,
451 *owner_uid = NULL, *unit = NULL, *selinux_context = NULL;
457 uid_t loginuid = 0, realuid = 0;
459 bool vacuumed = false;
464 assert(n + N_IOVEC_META_FIELDS <= m);
470 realuid = ucred->uid;
472 if (asprintf(&pid, "_PID=%lu", (unsigned long) ucred->pid) >= 0)
473 IOVEC_SET_STRING(iovec[n++], pid);
475 if (asprintf(&uid, "_UID=%lu", (unsigned long) ucred->uid) >= 0)
476 IOVEC_SET_STRING(iovec[n++], uid);
478 if (asprintf(&gid, "_GID=%lu", (unsigned long) ucred->gid) >= 0)
479 IOVEC_SET_STRING(iovec[n++], gid);
481 r = get_process_comm(ucred->pid, &t);
483 comm = strappend("_COMM=", t);
487 IOVEC_SET_STRING(iovec[n++], comm);
490 r = get_process_exe(ucred->pid, &t);
492 exe = strappend("_EXE=", t);
496 IOVEC_SET_STRING(iovec[n++], exe);
499 r = get_process_cmdline(ucred->pid, LINE_MAX, false, &t);
501 cmdline = strappend("_CMDLINE=", t);
505 IOVEC_SET_STRING(iovec[n++], cmdline);
508 r = audit_session_from_pid(ucred->pid, &audit);
510 if (asprintf(&audit_session, "_AUDIT_SESSION=%lu", (unsigned long) audit) >= 0)
511 IOVEC_SET_STRING(iovec[n++], audit_session);
513 r = audit_loginuid_from_pid(ucred->pid, &loginuid);
515 if (asprintf(&audit_loginuid, "_AUDIT_LOGINUID=%lu", (unsigned long) loginuid) >= 0)
516 IOVEC_SET_STRING(iovec[n++], audit_loginuid);
518 t = shortened_cgroup_path(ucred->pid);
520 cgroup = strappend("_SYSTEMD_CGROUP=", t);
524 IOVEC_SET_STRING(iovec[n++], cgroup);
527 if (sd_pid_get_session(ucred->pid, &t) >= 0) {
528 session = strappend("_SYSTEMD_SESSION=", t);
532 IOVEC_SET_STRING(iovec[n++], session);
535 if (sd_pid_get_unit(ucred->pid, &t) >= 0) {
536 unit = strappend("_SYSTEMD_UNIT=", t);
540 IOVEC_SET_STRING(iovec[n++], unit);
543 if (sd_pid_get_owner_uid(ucred->uid, &owner) >= 0)
544 if (asprintf(&owner_uid, "_SYSTEMD_OWNER_UID=%lu", (unsigned long) owner) >= 0)
545 IOVEC_SET_STRING(iovec[n++], owner_uid);
549 selinux_context = malloc(sizeof("_SELINUX_CONTEXT=") + label_len);
550 if (selinux_context) {
551 memcpy(selinux_context, "_SELINUX_CONTEXT=", sizeof("_SELINUX_CONTEXT=")-1);
552 memcpy(selinux_context+sizeof("_SELINUX_CONTEXT=")-1, label, label_len);
553 selinux_context[sizeof("_SELINUX_CONTEXT=")-1+label_len] = 0;
554 IOVEC_SET_STRING(iovec[n++], selinux_context);
557 security_context_t con;
559 if (getpidcon(ucred->pid, &con) >= 0) {
560 selinux_context = strappend("_SELINUX_CONTEXT=", con);
562 IOVEC_SET_STRING(iovec[n++], selinux_context);
571 if (asprintf(&source_time, "_SOURCE_REALTIME_TIMESTAMP=%llu",
572 (unsigned long long) timeval_load(tv)) >= 0)
573 IOVEC_SET_STRING(iovec[n++], source_time);
576 /* Note that strictly speaking storing the boot id here is
577 * redundant since the entry includes this in-line
578 * anyway. However, we need this indexed, too. */
579 r = sd_id128_get_boot(&id);
581 if (asprintf(&boot_id, "_BOOT_ID=%s", sd_id128_to_string(id, idbuf)) >= 0)
582 IOVEC_SET_STRING(iovec[n++], boot_id);
584 r = sd_id128_get_machine(&id);
586 if (asprintf(&machine_id, "_MACHINE_ID=%s", sd_id128_to_string(id, idbuf)) >= 0)
587 IOVEC_SET_STRING(iovec[n++], machine_id);
589 t = gethostname_malloc();
591 hostname = strappend("_HOSTNAME=", t);
594 IOVEC_SET_STRING(iovec[n++], hostname);
599 server_flush_to_var(s);
602 f = find_journal(s, realuid == 0 ? 0 : loginuid);
604 log_warning("Dropping message, as we can't find a place to store the data.");
606 r = journal_file_append_entry(f, NULL, iovec, n, &s->seqnum, NULL, NULL);
608 if ((r == -EBADMSG || r == -E2BIG) && !vacuumed) {
611 log_info("Allocation limit reached, rotating.");
613 log_warning("Journal file corrupted, rotating.");
619 log_info("Retrying write.");
624 log_error("Failed to write entry, ignoring: %s", strerror(-r));
638 free(audit_loginuid);
643 free(selinux_context);
646 static void driver_message(Server *s, sd_id128_t message_id, const char *format, ...) {
647 char mid[11 + 32 + 1];
648 char buffer[16 + LINE_MAX + 1];
649 struct iovec iovec[N_IOVEC_META_FIELDS + 4];
657 IOVEC_SET_STRING(iovec[n++], "PRIORITY=5");
658 IOVEC_SET_STRING(iovec[n++], "_TRANSPORT=driver");
660 memcpy(buffer, "MESSAGE=", 8);
661 va_start(ap, format);
662 vsnprintf(buffer + 8, sizeof(buffer) - 8, format, ap);
664 char_array_0(buffer);
665 IOVEC_SET_STRING(iovec[n++], buffer);
667 snprintf(mid, sizeof(mid), "MESSAGE_ID=" SD_ID128_FORMAT_STR, SD_ID128_FORMAT_VAL(message_id));
669 IOVEC_SET_STRING(iovec[n++], mid);
672 ucred.pid = getpid();
673 ucred.uid = getuid();
674 ucred.gid = getgid();
676 dispatch_message_real(s, iovec, n, ELEMENTSOF(iovec), &ucred, NULL, NULL, 0);
679 static void dispatch_message(Server *s,
680 struct iovec *iovec, unsigned n, unsigned m,
683 const char *label, size_t label_len,
686 char *path = NULL, *c;
689 assert(iovec || n == 0);
697 path = shortened_cgroup_path(ucred->pid);
701 /* example: /user/lennart/3/foobar
702 * /system/dbus.service/foobar
704 * So let's cut of everything past the third /, since that is
705 * wher user directories start */
707 c = strchr(path, '/');
709 c = strchr(c+1, '/');
711 c = strchr(c+1, '/');
717 rl = journal_rate_limit_test(s->rate_limit, path, priority & LOG_PRIMASK, available_space(s));
724 /* Write a suppression message if we suppressed something */
726 driver_message(s, SD_MESSAGE_JOURNAL_DROPPED, "Suppressed %u messages from %s", rl - 1, path);
731 dispatch_message_real(s, iovec, n, m, ucred, tv, label, label_len);
734 static void forward_syslog_iovec(Server *s, const struct iovec *iovec, unsigned n_iovec, struct ucred *ucred, struct timeval *tv) {
735 struct msghdr msghdr;
736 struct cmsghdr *cmsg;
738 struct cmsghdr cmsghdr;
739 uint8_t buf[CMSG_SPACE(sizeof(struct ucred))];
741 union sockaddr_union sa;
748 msghdr.msg_iov = (struct iovec*) iovec;
749 msghdr.msg_iovlen = n_iovec;
752 sa.un.sun_family = AF_UNIX;
753 strncpy(sa.un.sun_path, "/run/systemd/journal/syslog", sizeof(sa.un.sun_path));
754 msghdr.msg_name = &sa;
755 msghdr.msg_namelen = offsetof(union sockaddr_union, un.sun_path) + strlen(sa.un.sun_path);
759 msghdr.msg_control = &control;
760 msghdr.msg_controllen = sizeof(control);
762 cmsg = CMSG_FIRSTHDR(&msghdr);
763 cmsg->cmsg_level = SOL_SOCKET;
764 cmsg->cmsg_type = SCM_CREDENTIALS;
765 cmsg->cmsg_len = CMSG_LEN(sizeof(struct ucred));
766 memcpy(CMSG_DATA(cmsg), ucred, sizeof(struct ucred));
767 msghdr.msg_controllen = cmsg->cmsg_len;
770 /* Forward the syslog message we received via /dev/log to
771 * /run/systemd/syslog. Unfortunately we currently can't set
772 * the SO_TIMESTAMP auxiliary data, and hence we don't. */
774 if (sendmsg(s->syslog_fd, &msghdr, MSG_NOSIGNAL) >= 0)
777 /* The socket is full? I guess the syslog implementation is
778 * too slow, and we shouldn't wait for that... */
782 if (ucred && errno == ESRCH) {
785 /* Hmm, presumably the sender process vanished
786 * by now, so let's fix it as good as we
791 memcpy(CMSG_DATA(cmsg), &u, sizeof(struct ucred));
793 if (sendmsg(s->syslog_fd, &msghdr, MSG_NOSIGNAL) >= 0)
800 log_debug("Failed to forward syslog message: %m");
803 static void forward_syslog_raw(Server *s, const char *buffer, struct ucred *ucred, struct timeval *tv) {
809 IOVEC_SET_STRING(iovec, buffer);
810 forward_syslog_iovec(s, &iovec, 1, ucred, tv);
813 static void forward_syslog(Server *s, int priority, const char *identifier, const char *message, struct ucred *ucred, struct timeval *tv) {
814 struct iovec iovec[5];
815 char header_priority[6], header_time[64], header_pid[16];
819 char *ident_buf = NULL;
822 assert(priority >= 0);
823 assert(priority <= 999);
826 /* First: priority field */
827 snprintf(header_priority, sizeof(header_priority), "<%i>", priority);
828 char_array_0(header_priority);
829 IOVEC_SET_STRING(iovec[n++], header_priority);
831 /* Second: timestamp */
832 t = tv ? tv->tv_sec : ((time_t) (now(CLOCK_REALTIME) / USEC_PER_SEC));
836 if (strftime(header_time, sizeof(header_time), "%h %e %T ", tm) <= 0)
838 IOVEC_SET_STRING(iovec[n++], header_time);
840 /* Third: identifier and PID */
843 get_process_comm(ucred->pid, &ident_buf);
844 identifier = ident_buf;
847 snprintf(header_pid, sizeof(header_pid), "[%lu]: ", (unsigned long) ucred->pid);
848 char_array_0(header_pid);
851 IOVEC_SET_STRING(iovec[n++], identifier);
853 IOVEC_SET_STRING(iovec[n++], header_pid);
854 } else if (identifier) {
855 IOVEC_SET_STRING(iovec[n++], identifier);
856 IOVEC_SET_STRING(iovec[n++], ": ");
859 /* Fourth: message */
860 IOVEC_SET_STRING(iovec[n++], message);
862 forward_syslog_iovec(s, iovec, n, ucred, tv);
867 static int fixup_priority(int priority) {
869 if ((priority & LOG_FACMASK) == 0)
870 return (priority & LOG_PRIMASK) | LOG_USER;
875 static void forward_kmsg(Server *s, int priority, const char *identifier, const char *message, struct ucred *ucred) {
876 struct iovec iovec[5];
877 char header_priority[6], header_pid[16];
879 char *ident_buf = NULL;
883 assert(priority >= 0);
884 assert(priority <= 999);
887 /* Never allow messages with kernel facility to be written to
888 * kmsg, regardless where the data comes from. */
889 priority = fixup_priority(priority);
891 /* First: priority field */
892 snprintf(header_priority, sizeof(header_priority), "<%i>", priority);
893 char_array_0(header_priority);
894 IOVEC_SET_STRING(iovec[n++], header_priority);
896 /* Second: identifier and PID */
899 get_process_comm(ucred->pid, &ident_buf);
900 identifier = ident_buf;
903 snprintf(header_pid, sizeof(header_pid), "[%lu]: ", (unsigned long) ucred->pid);
904 char_array_0(header_pid);
907 IOVEC_SET_STRING(iovec[n++], identifier);
909 IOVEC_SET_STRING(iovec[n++], header_pid);
910 } else if (identifier) {
911 IOVEC_SET_STRING(iovec[n++], identifier);
912 IOVEC_SET_STRING(iovec[n++], ": ");
915 /* Fourth: message */
916 IOVEC_SET_STRING(iovec[n++], message);
917 IOVEC_SET_STRING(iovec[n++], "\n");
919 fd = open("/dev/kmsg", O_WRONLY|O_NOCTTY|O_CLOEXEC);
921 log_debug("Failed to open /dev/kmsg for logging: %s", strerror(errno));
925 if (writev(fd, iovec, n) < 0)
926 log_debug("Failed to write to /dev/kmsg for logging: %s", strerror(errno));
928 close_nointr_nofail(fd);
934 static void forward_console(Server *s, const char *identifier, const char *message, struct ucred *ucred) {
935 struct iovec iovec[4];
938 char *ident_buf = NULL;
943 /* First: identifier and PID */
946 get_process_comm(ucred->pid, &ident_buf);
947 identifier = ident_buf;
950 snprintf(header_pid, sizeof(header_pid), "[%lu]: ", (unsigned long) ucred->pid);
951 char_array_0(header_pid);
954 IOVEC_SET_STRING(iovec[n++], identifier);
956 IOVEC_SET_STRING(iovec[n++], header_pid);
957 } else if (identifier) {
958 IOVEC_SET_STRING(iovec[n++], identifier);
959 IOVEC_SET_STRING(iovec[n++], ": ");
963 IOVEC_SET_STRING(iovec[n++], message);
964 IOVEC_SET_STRING(iovec[n++], "\n");
966 fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC);
968 log_debug("Failed to open /dev/console for logging: %s", strerror(errno));
972 if (writev(fd, iovec, n) < 0)
973 log_debug("Failed to write to /dev/console for logging: %s", strerror(errno));
975 close_nointr_nofail(fd);
981 static void read_identifier(const char **buf, char **identifier, char **pid) {
992 p += strspn(p, WHITESPACE);
993 l = strcspn(p, WHITESPACE);
1002 if (p[l-1] == ']') {
1008 t = strndup(p+k+1, l-k-2);
1028 *buf += strspn(*buf, WHITESPACE);
1031 static void process_syslog_message(Server *s, const char *buf, struct ucred *ucred, struct timeval *tv, const char *label, size_t label_len) {
1032 char *message = NULL, *syslog_priority = NULL, *syslog_facility = NULL, *syslog_identifier = NULL, *syslog_pid = NULL;
1033 struct iovec iovec[N_IOVEC_META_FIELDS + 6];
1035 int priority = LOG_USER | LOG_INFO;
1036 char *identifier = NULL, *pid = NULL;
1041 if (s->forward_to_syslog)
1042 forward_syslog_raw(s, buf, ucred, tv);
1044 parse_syslog_priority((char**) &buf, &priority);
1045 skip_syslog_date((char**) &buf);
1046 read_identifier(&buf, &identifier, &pid);
1048 if (s->forward_to_kmsg)
1049 forward_kmsg(s, priority, identifier, buf, ucred);
1051 if (s->forward_to_console)
1052 forward_console(s, identifier, buf, ucred);
1054 IOVEC_SET_STRING(iovec[n++], "_TRANSPORT=syslog");
1056 if (asprintf(&syslog_priority, "PRIORITY=%i", priority & LOG_PRIMASK) >= 0)
1057 IOVEC_SET_STRING(iovec[n++], syslog_priority);
1059 if (priority & LOG_FACMASK)
1060 if (asprintf(&syslog_facility, "SYSLOG_FACILITY=%i", LOG_FAC(priority)) >= 0)
1061 IOVEC_SET_STRING(iovec[n++], syslog_facility);
1064 syslog_identifier = strappend("SYSLOG_IDENTIFIER=", identifier);
1065 if (syslog_identifier)
1066 IOVEC_SET_STRING(iovec[n++], syslog_identifier);
1070 syslog_pid = strappend("SYSLOG_PID=", pid);
1072 IOVEC_SET_STRING(iovec[n++], syslog_pid);
1075 message = strappend("MESSAGE=", buf);
1077 IOVEC_SET_STRING(iovec[n++], message);
1079 dispatch_message(s, iovec, n, ELEMENTSOF(iovec), ucred, tv, label, label_len, priority);
1084 free(syslog_priority);
1085 free(syslog_facility);
1086 free(syslog_identifier);
1089 static bool valid_user_field(const char *p, size_t l) {
1092 /* We kinda enforce POSIX syntax recommendations for
1093 environment variables here, but make a couple of additional
1096 http://pubs.opengroup.org/onlinepubs/000095399/basedefs/xbd_chap08.html */
1098 /* No empty field names */
1102 /* Don't allow names longer than 64 chars */
1106 /* Variables starting with an underscore are protected */
1110 /* Don't allow digits as first character */
1111 if (p[0] >= '0' && p[0] <= '9')
1114 /* Only allow A-Z0-9 and '_' */
1115 for (a = p; a < p + l; a++)
1116 if (!((*a >= 'A' && *a <= 'Z') ||
1117 (*a >= '0' && *a <= '9') ||
1124 static void process_native_message(
1126 const void *buffer, size_t buffer_size,
1127 struct ucred *ucred,
1129 const char *label, size_t label_len) {
1131 struct iovec *iovec = NULL;
1132 unsigned n = 0, m = 0, j, tn = (unsigned) -1;
1135 int priority = LOG_INFO;
1136 char *identifier = NULL, *message = NULL;
1139 assert(buffer || n == 0);
1142 remaining = buffer_size;
1144 while (remaining > 0) {
1147 e = memchr(p, '\n', remaining);
1150 /* Trailing noise, let's ignore it, and flush what we collected */
1151 log_debug("Received message with trailing noise, ignoring.");
1156 /* Entry separator */
1157 dispatch_message(s, iovec, n, m, ucred, tv, label, label_len, priority);
1159 priority = LOG_INFO;
1166 if (*p == '.' || *p == '#') {
1167 /* Ignore control commands for now, and
1169 remaining -= (e - p) + 1;
1174 /* A property follows */
1176 if (n+N_IOVEC_META_FIELDS >= m) {
1180 u = MAX((n+N_IOVEC_META_FIELDS+1) * 2U, 4U);
1181 c = realloc(iovec, u * sizeof(struct iovec));
1183 log_error("Out of memory");
1191 q = memchr(p, '=', e - p);
1193 if (valid_user_field(p, q - p)) {
1198 /* If the field name starts with an
1199 * underscore, skip the variable,
1200 * since that indidates a trusted
1202 iovec[n].iov_base = (char*) p;
1203 iovec[n].iov_len = l;
1206 /* We need to determine the priority
1207 * of this entry for the rate limiting
1210 memcmp(p, "PRIORITY=", 9) == 0 &&
1211 p[9] >= '0' && p[9] <= '9')
1212 priority = (priority & LOG_FACMASK) | (p[9] - '0');
1215 memcmp(p, "SYSLOG_FACILITY=", 16) == 0 &&
1216 p[16] >= '0' && p[16] <= '9')
1217 priority = (priority & LOG_PRIMASK) | ((p[16] - '0') << 3);
1220 memcmp(p, "SYSLOG_FACILITY=", 16) == 0 &&
1221 p[16] >= '0' && p[16] <= '9' &&
1222 p[17] >= '0' && p[17] <= '9')
1223 priority = (priority & LOG_PRIMASK) | (((p[16] - '0')*10 + (p[17] - '0')) << 3);
1226 memcmp(p, "SYSLOG_IDENTIFIER=", 11) == 0) {
1229 t = strndup(p + 11, l - 11);
1234 } else if (l >= 8 &&
1235 memcmp(p, "MESSAGE=", 8) == 0) {
1238 t = strndup(p + 8, l - 8);
1246 remaining -= (e - p) + 1;
1253 if (remaining < e - p + 1 + sizeof(uint64_t) + 1) {
1254 log_debug("Failed to parse message, ignoring.");
1258 memcpy(&l, e + 1, sizeof(uint64_t));
1261 if (remaining < e - p + 1 + sizeof(uint64_t) + l + 1 ||
1262 e[1+sizeof(uint64_t)+l] != '\n') {
1263 log_debug("Failed to parse message, ignoring.");
1267 k = malloc((e - p) + 1 + l);
1269 log_error("Out of memory");
1273 memcpy(k, p, e - p);
1275 memcpy(k + (e - p) + 1, e + 1 + sizeof(uint64_t), l);
1277 if (valid_user_field(p, e - p)) {
1278 iovec[n].iov_base = k;
1279 iovec[n].iov_len = (e - p) + 1 + l;
1284 remaining -= (e - p) + 1 + sizeof(uint64_t) + l + 1;
1285 p = e + 1 + sizeof(uint64_t) + l + 1;
1293 IOVEC_SET_STRING(iovec[tn], "_TRANSPORT=journal");
1296 if (s->forward_to_syslog)
1297 forward_syslog(s, priority, identifier, message, ucred, tv);
1299 if (s->forward_to_kmsg)
1300 forward_kmsg(s, priority, identifier, message, ucred);
1302 if (s->forward_to_console)
1303 forward_console(s, identifier, message, ucred);
1306 dispatch_message(s, iovec, n, m, ucred, tv, label, label_len, priority);
1309 for (j = 0; j < n; j++) {
1313 if (iovec[j].iov_base < buffer ||
1314 (const uint8_t*) iovec[j].iov_base >= (const uint8_t*) buffer + buffer_size)
1315 free(iovec[j].iov_base);
1323 static void process_native_file(
1326 struct ucred *ucred,
1328 const char *label, size_t label_len) {
1337 /* Data is in the passed file, since it didn't fit in a
1338 * datagram. We can't map the file here, since clients might
1339 * then truncate it and trigger a SIGBUS for us. So let's
1340 * stupidly read it */
1342 if (fstat(fd, &st) < 0) {
1343 log_error("Failed to stat passed file, ignoring: %m");
1347 if (!S_ISREG(st.st_mode)) {
1348 log_error("File passed is not regular. Ignoring.");
1352 if (st.st_size <= 0)
1355 if (st.st_size > ENTRY_SIZE_MAX) {
1356 log_error("File passed too large. Ignoring.");
1360 p = malloc(st.st_size);
1362 log_error("Out of memory");
1366 n = pread(fd, p, st.st_size, 0);
1368 log_error("Failed to read file, ignoring: %s", strerror(-n));
1370 process_native_message(s, p, n, ucred, tv, label, label_len);
1375 static int stdout_stream_log(StdoutStream *s, const char *p) {
1376 struct iovec iovec[N_IOVEC_META_FIELDS + 5];
1377 char *message = NULL, *syslog_priority = NULL, *syslog_facility = NULL, *syslog_identifier = NULL;
1381 size_t label_len = 0;
1389 priority = s->priority;
1391 if (s->level_prefix)
1392 parse_syslog_priority((char**) &p, &priority);
1394 if (s->forward_to_syslog || s->server->forward_to_syslog)
1395 forward_syslog(s->server, fixup_priority(priority), s->identifier, p, &s->ucred, NULL);
1397 if (s->forward_to_kmsg || s->server->forward_to_kmsg)
1398 forward_kmsg(s->server, priority, s->identifier, p, &s->ucred);
1400 if (s->forward_to_console || s->server->forward_to_console)
1401 forward_console(s->server, s->identifier, p, &s->ucred);
1403 IOVEC_SET_STRING(iovec[n++], "_TRANSPORT=stdout");
1405 if (asprintf(&syslog_priority, "PRIORITY=%i", priority & LOG_PRIMASK) >= 0)
1406 IOVEC_SET_STRING(iovec[n++], syslog_priority);
1408 if (priority & LOG_FACMASK)
1409 if (asprintf(&syslog_facility, "SYSLOG_FACILITY=%i", LOG_FAC(priority)) >= 0)
1410 IOVEC_SET_STRING(iovec[n++], syslog_facility);
1412 if (s->identifier) {
1413 syslog_identifier = strappend("SYSLOG_IDENTIFIER=", s->identifier);
1414 if (syslog_identifier)
1415 IOVEC_SET_STRING(iovec[n++], syslog_identifier);
1418 message = strappend("MESSAGE=", p);
1420 IOVEC_SET_STRING(iovec[n++], message);
1423 if (s->security_context) {
1424 label = (char*) s->security_context;
1425 label_len = strlen((char*) s->security_context);
1429 dispatch_message(s->server, iovec, n, ELEMENTSOF(iovec), &s->ucred, NULL, label, label_len, priority);
1432 free(syslog_priority);
1433 free(syslog_facility);
1434 free(syslog_identifier);
1439 static int stdout_stream_line(StdoutStream *s, char *p) {
1449 case STDOUT_STREAM_IDENTIFIER:
1451 s->identifier = NULL;
1453 s->identifier = strdup(p);
1454 if (!s->identifier) {
1455 log_error("Out of memory");
1460 s->state = STDOUT_STREAM_PRIORITY;
1463 case STDOUT_STREAM_PRIORITY:
1464 r = safe_atoi(p, &s->priority);
1465 if (r < 0 || s->priority <= 0 || s->priority >= 999) {
1466 log_warning("Failed to parse log priority line.");
1470 s->state = STDOUT_STREAM_LEVEL_PREFIX;
1473 case STDOUT_STREAM_LEVEL_PREFIX:
1474 r = parse_boolean(p);
1476 log_warning("Failed to parse level prefix line.");
1480 s->level_prefix = !!r;
1481 s->state = STDOUT_STREAM_FORWARD_TO_SYSLOG;
1484 case STDOUT_STREAM_FORWARD_TO_SYSLOG:
1485 r = parse_boolean(p);
1487 log_warning("Failed to parse forward to syslog line.");
1491 s->forward_to_syslog = !!r;
1492 s->state = STDOUT_STREAM_FORWARD_TO_KMSG;
1495 case STDOUT_STREAM_FORWARD_TO_KMSG:
1496 r = parse_boolean(p);
1498 log_warning("Failed to parse copy to kmsg line.");
1502 s->forward_to_kmsg = !!r;
1503 s->state = STDOUT_STREAM_FORWARD_TO_CONSOLE;
1506 case STDOUT_STREAM_FORWARD_TO_CONSOLE:
1507 r = parse_boolean(p);
1509 log_warning("Failed to parse copy to console line.");
1513 s->forward_to_console = !!r;
1514 s->state = STDOUT_STREAM_RUNNING;
1517 case STDOUT_STREAM_RUNNING:
1518 return stdout_stream_log(s, p);
1521 assert_not_reached("Unknown stream state");
1524 static int stdout_stream_scan(StdoutStream *s, bool force_flush) {
1532 remaining = s->length;
1537 end = memchr(p, '\n', remaining);
1540 else if (remaining >= sizeof(s->buffer) - 1) {
1541 end = p + sizeof(s->buffer) - 1;
1548 r = stdout_stream_line(s, p);
1556 if (force_flush && remaining > 0) {
1558 r = stdout_stream_line(s, p);
1566 if (p > s->buffer) {
1567 memmove(s->buffer, p, remaining);
1568 s->length = remaining;
1574 static int stdout_stream_process(StdoutStream *s) {
1580 l = read(s->fd, s->buffer+s->length, sizeof(s->buffer)-1-s->length);
1583 if (errno == EAGAIN)
1586 log_warning("Failed to read from stream: %m");
1591 r = stdout_stream_scan(s, true);
1599 r = stdout_stream_scan(s, false);
1607 static void stdout_stream_free(StdoutStream *s) {
1611 assert(s->server->n_stdout_streams > 0);
1612 s->server->n_stdout_streams --;
1613 LIST_REMOVE(StdoutStream, stdout_stream, s->server->stdout_streams, s);
1618 epoll_ctl(s->server->epoll_fd, EPOLL_CTL_DEL, s->fd, NULL);
1620 close_nointr_nofail(s->fd);
1624 if (s->security_context)
1625 freecon(s->security_context);
1628 free(s->identifier);
1632 static int stdout_stream_new(Server *s) {
1633 StdoutStream *stream;
1636 struct epoll_event ev;
1640 fd = accept4(s->stdout_fd, NULL, NULL, SOCK_NONBLOCK|SOCK_CLOEXEC);
1642 if (errno == EAGAIN)
1645 log_error("Failed to accept stdout connection: %m");
1649 if (s->n_stdout_streams >= STDOUT_STREAMS_MAX) {
1650 log_warning("Too many stdout streams, refusing connection.");
1651 close_nointr_nofail(fd);
1655 stream = new0(StdoutStream, 1);
1657 log_error("Out of memory.");
1658 close_nointr_nofail(fd);
1664 len = sizeof(stream->ucred);
1665 if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &stream->ucred, &len) < 0) {
1666 log_error("Failed to determine peer credentials: %m");
1672 if (getpeercon(fd, &stream->security_context) < 0)
1673 log_error("Failed to determine peer security context.");
1676 if (shutdown(fd, SHUT_WR) < 0) {
1677 log_error("Failed to shutdown writing side of socket: %m");
1683 ev.data.ptr = stream;
1684 ev.events = EPOLLIN;
1685 if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0) {
1686 log_error("Failed to add stream to event loop: %m");
1692 LIST_PREPEND(StdoutStream, stdout_stream, s->stdout_streams, stream);
1693 s->n_stdout_streams ++;
1698 stdout_stream_free(stream);
1702 static int parse_kernel_timestamp(char **_p, usec_t *t) {
1713 if (strlen(p) < 14 || p[0] != '[' || p[13] != ']' || p[6] != '.')
1718 for (i = 1; i <= 5; i++) {
1724 k = undecchar(p[i]);
1731 for (i = 7; i <= 12; i++) {
1734 k = undecchar(p[i]);
1743 *_p += strspn(*_p, WHITESPACE);
1748 static void proc_kmsg_line(Server *s, const char *p) {
1749 struct iovec iovec[N_IOVEC_META_FIELDS + 7];
1750 char *message = NULL, *syslog_priority = NULL, *syslog_pid = NULL, *syslog_facility = NULL, *syslog_identifier = NULL, *source_time = NULL;
1751 int priority = LOG_KERN | LOG_INFO;
1754 char *identifier = NULL, *pid = NULL;
1762 parse_syslog_priority((char **) &p, &priority);
1764 if (s->forward_to_kmsg && (priority & LOG_FACMASK) != LOG_KERN)
1767 if (parse_kernel_timestamp((char **) &p, &usec) > 0) {
1768 if (asprintf(&source_time, "_SOURCE_MONOTONIC_TIMESTAMP=%llu",
1769 (unsigned long long) usec) >= 0)
1770 IOVEC_SET_STRING(iovec[n++], source_time);
1773 IOVEC_SET_STRING(iovec[n++], "_TRANSPORT=kernel");
1775 if (asprintf(&syslog_priority, "PRIORITY=%i", priority & LOG_PRIMASK) >= 0)
1776 IOVEC_SET_STRING(iovec[n++], syslog_priority);
1778 if ((priority & LOG_FACMASK) == LOG_KERN) {
1780 if (s->forward_to_syslog)
1781 forward_syslog(s, priority, "kernel", p, NULL, NULL);
1783 IOVEC_SET_STRING(iovec[n++], "SYSLOG_IDENTIFIER=kernel");
1785 read_identifier(&p, &identifier, &pid);
1787 if (s->forward_to_syslog)
1788 forward_syslog(s, priority, identifier, p, NULL, NULL);
1791 syslog_identifier = strappend("SYSLOG_IDENTIFIER=", identifier);
1792 if (syslog_identifier)
1793 IOVEC_SET_STRING(iovec[n++], syslog_identifier);
1797 syslog_pid = strappend("SYSLOG_PID=", pid);
1799 IOVEC_SET_STRING(iovec[n++], syslog_pid);
1802 if (asprintf(&syslog_facility, "SYSLOG_FACILITY=%i", LOG_FAC(priority)) >= 0)
1803 IOVEC_SET_STRING(iovec[n++], syslog_facility);
1806 message = strappend("MESSAGE=", p);
1808 IOVEC_SET_STRING(iovec[n++], message);
1810 dispatch_message(s, iovec, n, ELEMENTSOF(iovec), NULL, NULL, NULL, 0, priority);
1813 free(syslog_priority);
1814 free(syslog_identifier);
1816 free(syslog_facility);
1822 static void proc_kmsg_scan(Server *s) {
1828 p = s->proc_kmsg_buffer;
1829 remaining = s->proc_kmsg_length;
1834 end = memchr(p, '\n', remaining);
1837 else if (remaining >= sizeof(s->proc_kmsg_buffer) - 1) {
1838 end = p + sizeof(s->proc_kmsg_buffer) - 1;
1845 proc_kmsg_line(s, p);
1851 if (p > s->proc_kmsg_buffer) {
1852 memmove(s->proc_kmsg_buffer, p, remaining);
1853 s->proc_kmsg_length = remaining;
1857 static int system_journal_open(Server *s) {
1863 r = sd_id128_get_machine(&machine);
1867 sd_id128_to_string(machine, ids);
1869 if (!s->system_journal) {
1871 /* First try to create the machine path, but not the prefix */
1872 fn = strappend("/var/log/journal/", ids);
1875 (void) mkdir(fn, 0755);
1878 /* The create the system journal file */
1879 fn = join("/var/log/journal/", ids, "/system.journal", NULL);
1883 r = journal_file_open_reliably(fn, O_RDWR|O_CREAT, 0640, NULL, &s->system_journal);
1887 journal_default_metrics(&s->system_metrics, s->system_journal->fd);
1889 s->system_journal->metrics = s->system_metrics;
1890 s->system_journal->compress = s->compress;
1892 server_fix_perms(s, s->system_journal, 0);
1895 if (r != -ENOENT && r != -EROFS)
1896 log_warning("Failed to open system journal: %s", strerror(-r));
1902 if (!s->runtime_journal) {
1904 fn = join("/run/log/journal/", ids, "/system.journal", NULL);
1908 if (s->system_journal) {
1910 /* Try to open the runtime journal, but only
1911 * if it already exists, so that we can flush
1912 * it into the system journal */
1914 r = journal_file_open_reliably(fn, O_RDWR, 0640, NULL, &s->runtime_journal);
1919 log_warning("Failed to open runtime journal: %s", strerror(-r));
1926 /* OK, we really need the runtime journal, so create
1927 * it if necessary. */
1929 (void) mkdir_parents(fn, 0755);
1930 r = journal_file_open_reliably(fn, O_RDWR|O_CREAT, 0640, NULL, &s->runtime_journal);
1934 log_error("Failed to open runtime journal: %s", strerror(-r));
1939 if (s->runtime_journal) {
1940 journal_default_metrics(&s->runtime_metrics, s->runtime_journal->fd);
1942 s->runtime_journal->metrics = s->runtime_metrics;
1943 s->runtime_journal->compress = s->compress;
1945 server_fix_perms(s, s->runtime_journal, 0);
1952 static int server_flush_to_var(Server *s) {
1953 char path[] = "/run/log/journal/xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
1962 if (!s->runtime_journal)
1965 ts = now(CLOCK_MONOTONIC);
1966 if (s->var_available_timestamp + RECHECK_VAR_AVAILABLE_USEC > ts)
1969 s->var_available_timestamp = ts;
1971 system_journal_open(s);
1973 if (!s->system_journal)
1976 log_info("Flushing to /var...");
1978 r = sd_id128_get_machine(&machine);
1980 log_error("Failed to get machine id: %s", strerror(-r));
1984 r = sd_journal_open(&j, SD_JOURNAL_RUNTIME_ONLY);
1986 log_error("Failed to read runtime journal: %s", strerror(-r));
1990 SD_JOURNAL_FOREACH(j) {
1993 f = j->current_file;
1994 assert(f && f->current_offset > 0);
1996 r = journal_file_move_to_object(f, OBJECT_ENTRY, f->current_offset, &o);
1998 log_error("Can't read entry: %s", strerror(-r));
2002 r = journal_file_copy_entry(f, s->system_journal, o, f->current_offset, NULL, NULL, NULL);
2004 log_info("Allocation limit reached.");
2006 journal_file_post_change(s->system_journal);
2010 r = journal_file_copy_entry(f, s->system_journal, o, f->current_offset, NULL, NULL, NULL);
2014 log_error("Can't write entry: %s", strerror(-r));
2020 journal_file_post_change(s->system_journal);
2022 journal_file_close(s->runtime_journal);
2023 s->runtime_journal = NULL;
2026 sd_id128_to_string(machine, path + 17);
2027 rm_rf(path, false, true, false);
2033 static int server_read_proc_kmsg(Server *s) {
2036 assert(s->proc_kmsg_fd >= 0);
2038 l = read(s->proc_kmsg_fd, s->proc_kmsg_buffer + s->proc_kmsg_length, sizeof(s->proc_kmsg_buffer) - 1 - s->proc_kmsg_length);
2041 if (errno == EAGAIN || errno == EINTR)
2044 log_error("Failed to read from kernel: %m");
2048 s->proc_kmsg_length += l;
2054 static int server_flush_proc_kmsg(Server *s) {
2059 if (s->proc_kmsg_fd < 0)
2062 log_info("Flushing /proc/kmsg...");
2065 r = server_read_proc_kmsg(s);
2076 static int process_event(Server *s, struct epoll_event *ev) {
2079 if (ev->data.fd == s->signal_fd) {
2080 struct signalfd_siginfo sfsi;
2083 if (ev->events != EPOLLIN) {
2084 log_info("Got invalid event from epoll.");
2088 n = read(s->signal_fd, &sfsi, sizeof(sfsi));
2089 if (n != sizeof(sfsi)) {
2094 if (errno == EINTR || errno == EAGAIN)
2100 if (sfsi.ssi_signo == SIGUSR1) {
2101 server_flush_to_var(s);
2105 log_debug("Received SIG%s", signal_to_string(sfsi.ssi_signo));
2108 } else if (ev->data.fd == s->proc_kmsg_fd) {
2111 if (ev->events != EPOLLIN) {
2112 log_info("Got invalid event from epoll.");
2116 r = server_read_proc_kmsg(s);
2122 } else if (ev->data.fd == s->native_fd ||
2123 ev->data.fd == s->syslog_fd) {
2125 if (ev->events != EPOLLIN) {
2126 log_info("Got invalid event from epoll.");
2131 struct msghdr msghdr;
2133 struct ucred *ucred = NULL;
2134 struct timeval *tv = NULL;
2135 struct cmsghdr *cmsg;
2137 size_t label_len = 0;
2139 struct cmsghdr cmsghdr;
2140 uint8_t buf[CMSG_SPACE(sizeof(struct ucred)) +
2141 CMSG_SPACE(sizeof(struct timeval)) +
2142 CMSG_SPACE(sizeof(int)) +
2143 CMSG_SPACE(PAGE_SIZE)]; /* selinux label */
2150 if (ioctl(ev->data.fd, SIOCINQ, &v) < 0) {
2151 log_error("SIOCINQ failed: %m");
2155 if (s->buffer_size < (size_t) v) {
2159 l = MAX(LINE_MAX + (size_t) v, s->buffer_size * 2);
2160 b = realloc(s->buffer, l+1);
2163 log_error("Couldn't increase buffer.");
2172 iovec.iov_base = s->buffer;
2173 iovec.iov_len = s->buffer_size;
2177 msghdr.msg_iov = &iovec;
2178 msghdr.msg_iovlen = 1;
2179 msghdr.msg_control = &control;
2180 msghdr.msg_controllen = sizeof(control);
2182 n = recvmsg(ev->data.fd, &msghdr, MSG_DONTWAIT|MSG_CMSG_CLOEXEC);
2185 if (errno == EINTR || errno == EAGAIN)
2188 log_error("recvmsg() failed: %m");
2192 for (cmsg = CMSG_FIRSTHDR(&msghdr); cmsg; cmsg = CMSG_NXTHDR(&msghdr, cmsg)) {
2194 if (cmsg->cmsg_level == SOL_SOCKET &&
2195 cmsg->cmsg_type == SCM_CREDENTIALS &&
2196 cmsg->cmsg_len == CMSG_LEN(sizeof(struct ucred)))
2197 ucred = (struct ucred*) CMSG_DATA(cmsg);
2198 else if (cmsg->cmsg_level == SOL_SOCKET &&
2199 cmsg->cmsg_type == SCM_SECURITY) {
2200 label = (char*) CMSG_DATA(cmsg);
2201 label_len = cmsg->cmsg_len - CMSG_LEN(0);
2202 } else if (cmsg->cmsg_level == SOL_SOCKET &&
2203 cmsg->cmsg_type == SO_TIMESTAMP &&
2204 cmsg->cmsg_len == CMSG_LEN(sizeof(struct timeval)))
2205 tv = (struct timeval*) CMSG_DATA(cmsg);
2206 else if (cmsg->cmsg_level == SOL_SOCKET &&
2207 cmsg->cmsg_type == SCM_RIGHTS) {
2208 fds = (int*) CMSG_DATA(cmsg);
2209 n_fds = (cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int);
2213 if (ev->data.fd == s->syslog_fd) {
2216 if (n > 0 && n_fds == 0) {
2217 e = memchr(s->buffer, '\n', n);
2223 process_syslog_message(s, strstrip(s->buffer), ucred, tv, label, label_len);
2224 } else if (n_fds > 0)
2225 log_warning("Got file descriptors via syslog socket. Ignoring.");
2228 if (n > 0 && n_fds == 0)
2229 process_native_message(s, s->buffer, n, ucred, tv, label, label_len);
2230 else if (n == 0 && n_fds == 1)
2231 process_native_file(s, fds[0], ucred, tv, label, label_len);
2233 log_warning("Got too many file descriptors via native socket. Ignoring.");
2236 close_many(fds, n_fds);
2241 } else if (ev->data.fd == s->stdout_fd) {
2243 if (ev->events != EPOLLIN) {
2244 log_info("Got invalid event from epoll.");
2248 stdout_stream_new(s);
2252 StdoutStream *stream;
2254 if ((ev->events|EPOLLIN|EPOLLHUP) != (EPOLLIN|EPOLLHUP)) {
2255 log_info("Got invalid event from epoll.");
2259 /* If it is none of the well-known fds, it must be an
2260 * stdout stream fd. Note that this is a bit ugly here
2261 * (since we rely that none of the well-known fds
2262 * could be interpreted as pointer), but nonetheless
2263 * safe, since the well-known fds would never get an
2264 * fd > 4096, i.e. beyond the first memory page */
2266 stream = ev->data.ptr;
2268 if (stdout_stream_process(stream) <= 0)
2269 stdout_stream_free(stream);
2274 log_error("Unknown event.");
2278 static int open_syslog_socket(Server *s) {
2279 union sockaddr_union sa;
2281 struct epoll_event ev;
2285 if (s->syslog_fd < 0) {
2287 s->syslog_fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
2288 if (s->syslog_fd < 0) {
2289 log_error("socket() failed: %m");
2294 sa.un.sun_family = AF_UNIX;
2295 strncpy(sa.un.sun_path, "/dev/log", sizeof(sa.un.sun_path));
2297 unlink(sa.un.sun_path);
2299 r = bind(s->syslog_fd, &sa.sa, offsetof(union sockaddr_union, un.sun_path) + strlen(sa.un.sun_path));
2301 log_error("bind() failed: %m");
2305 chmod(sa.un.sun_path, 0666);
2307 fd_nonblock(s->syslog_fd, 1);
2310 r = setsockopt(s->syslog_fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one));
2312 log_error("SO_PASSCRED failed: %m");
2318 r = setsockopt(s->syslog_fd, SOL_SOCKET, SO_PASSSEC, &one, sizeof(one));
2320 log_warning("SO_PASSSEC failed: %m");
2324 r = setsockopt(s->syslog_fd, SOL_SOCKET, SO_TIMESTAMP, &one, sizeof(one));
2326 log_error("SO_TIMESTAMP failed: %m");
2331 ev.events = EPOLLIN;
2332 ev.data.fd = s->syslog_fd;
2333 if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->syslog_fd, &ev) < 0) {
2334 log_error("Failed to add syslog server fd to epoll object: %m");
2341 static int open_native_socket(Server*s) {
2342 union sockaddr_union sa;
2344 struct epoll_event ev;
2348 if (s->native_fd < 0) {
2350 s->native_fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
2351 if (s->native_fd < 0) {
2352 log_error("socket() failed: %m");
2357 sa.un.sun_family = AF_UNIX;
2358 strncpy(sa.un.sun_path, "/run/systemd/journal/socket", sizeof(sa.un.sun_path));
2360 unlink(sa.un.sun_path);
2362 r = bind(s->native_fd, &sa.sa, offsetof(union sockaddr_union, un.sun_path) + strlen(sa.un.sun_path));
2364 log_error("bind() failed: %m");
2368 chmod(sa.un.sun_path, 0666);
2370 fd_nonblock(s->native_fd, 1);
2373 r = setsockopt(s->native_fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one));
2375 log_error("SO_PASSCRED failed: %m");
2381 r = setsockopt(s->syslog_fd, SOL_SOCKET, SO_PASSSEC, &one, sizeof(one));
2383 log_warning("SO_PASSSEC failed: %m");
2387 r = setsockopt(s->native_fd, SOL_SOCKET, SO_TIMESTAMP, &one, sizeof(one));
2389 log_error("SO_TIMESTAMP failed: %m");
2394 ev.events = EPOLLIN;
2395 ev.data.fd = s->native_fd;
2396 if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->native_fd, &ev) < 0) {
2397 log_error("Failed to add native server fd to epoll object: %m");
2404 static int open_stdout_socket(Server *s) {
2405 union sockaddr_union sa;
2407 struct epoll_event ev;
2411 if (s->stdout_fd < 0) {
2413 s->stdout_fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
2414 if (s->stdout_fd < 0) {
2415 log_error("socket() failed: %m");
2420 sa.un.sun_family = AF_UNIX;
2421 strncpy(sa.un.sun_path, "/run/systemd/journal/stdout", sizeof(sa.un.sun_path));
2423 unlink(sa.un.sun_path);
2425 r = bind(s->stdout_fd, &sa.sa, offsetof(union sockaddr_union, un.sun_path) + strlen(sa.un.sun_path));
2427 log_error("bind() failed: %m");
2431 chmod(sa.un.sun_path, 0666);
2433 if (listen(s->stdout_fd, SOMAXCONN) < 0) {
2434 log_error("liste() failed: %m");
2438 fd_nonblock(s->stdout_fd, 1);
2441 ev.events = EPOLLIN;
2442 ev.data.fd = s->stdout_fd;
2443 if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->stdout_fd, &ev) < 0) {
2444 log_error("Failed to add stdout server fd to epoll object: %m");
2451 static int open_proc_kmsg(Server *s) {
2452 struct epoll_event ev;
2456 if (!s->import_proc_kmsg)
2460 s->proc_kmsg_fd = open("/proc/kmsg", O_CLOEXEC|O_NONBLOCK|O_NOCTTY);
2461 if (s->proc_kmsg_fd < 0) {
2462 log_warning("Failed to open /proc/kmsg, ignoring: %m");
2467 ev.events = EPOLLIN;
2468 ev.data.fd = s->proc_kmsg_fd;
2469 if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->proc_kmsg_fd, &ev) < 0) {
2470 log_error("Failed to add /proc/kmsg fd to epoll object: %m");
2477 static int open_signalfd(Server *s) {
2479 struct epoll_event ev;
2483 assert_se(sigemptyset(&mask) == 0);
2484 sigset_add_many(&mask, SIGINT, SIGTERM, SIGUSR1, -1);
2485 assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
2487 s->signal_fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC);
2488 if (s->signal_fd < 0) {
2489 log_error("signalfd(): %m");
2494 ev.events = EPOLLIN;
2495 ev.data.fd = s->signal_fd;
2497 if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->signal_fd, &ev) < 0) {
2498 log_error("epoll_ctl(): %m");
2505 static int server_parse_proc_cmdline(Server *s) {
2506 char *line, *w, *state;
2510 if (detect_container(NULL) > 0)
2513 r = read_one_line_file("/proc/cmdline", &line);
2515 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
2519 FOREACH_WORD_QUOTED(w, l, line, state) {
2522 word = strndup(w, l);
2528 if (startswith(word, "systemd_journald.forward_to_syslog=")) {
2529 r = parse_boolean(word + 35);
2531 log_warning("Failed to parse forward to syslog switch %s. Ignoring.", word + 35);
2533 s->forward_to_syslog = r;
2534 } else if (startswith(word, "systemd_journald.forward_to_kmsg=")) {
2535 r = parse_boolean(word + 33);
2537 log_warning("Failed to parse forward to kmsg switch %s. Ignoring.", word + 33);
2539 s->forward_to_kmsg = r;
2540 } else if (startswith(word, "systemd_journald.forward_to_console=")) {
2541 r = parse_boolean(word + 36);
2543 log_warning("Failed to parse forward to console switch %s. Ignoring.", word + 36);
2545 s->forward_to_console = r;
2558 static int server_parse_config_file(Server *s) {
2565 fn = "/etc/systemd/systemd-journald.conf";
2566 f = fopen(fn, "re");
2568 if (errno == ENOENT)
2571 log_warning("Failed to open configuration file %s: %m", fn);
2575 r = config_parse(fn, f, "Journal\0", config_item_perf_lookup, (void*) journald_gperf_lookup, false, s);
2577 log_warning("Failed to parse configuration file: %s", strerror(-r));
2584 static int server_init(Server *s) {
2590 s->syslog_fd = s->native_fd = s->stdout_fd = s->signal_fd = s->epoll_fd = s->proc_kmsg_fd = -1;
2593 s->rate_limit_interval = DEFAULT_RATE_LIMIT_INTERVAL;
2594 s->rate_limit_burst = DEFAULT_RATE_LIMIT_BURST;
2596 s->forward_to_syslog = true;
2597 s->import_proc_kmsg = true;
2599 memset(&s->system_metrics, 0xFF, sizeof(s->system_metrics));
2600 memset(&s->runtime_metrics, 0xFF, sizeof(s->runtime_metrics));
2602 server_parse_config_file(s);
2603 server_parse_proc_cmdline(s);
2605 s->user_journals = hashmap_new(trivial_hash_func, trivial_compare_func);
2606 if (!s->user_journals) {
2607 log_error("Out of memory.");
2611 s->epoll_fd = epoll_create1(EPOLL_CLOEXEC);
2612 if (s->epoll_fd < 0) {
2613 log_error("Failed to create epoll object: %m");
2617 n = sd_listen_fds(true);
2619 log_error("Failed to read listening file descriptors from environment: %s", strerror(-n));
2623 for (fd = SD_LISTEN_FDS_START; fd < SD_LISTEN_FDS_START + n; fd++) {
2625 if (sd_is_socket_unix(fd, SOCK_DGRAM, -1, "/run/systemd/journal/socket", 0) > 0) {
2627 if (s->native_fd >= 0) {
2628 log_error("Too many native sockets passed.");
2634 } else if (sd_is_socket_unix(fd, SOCK_STREAM, 1, "/run/systemd/journal/stdout", 0) > 0) {
2636 if (s->stdout_fd >= 0) {
2637 log_error("Too many stdout sockets passed.");
2643 } else if (sd_is_socket_unix(fd, SOCK_DGRAM, -1, "/dev/log", 0) > 0) {
2645 if (s->syslog_fd >= 0) {
2646 log_error("Too many /dev/log sockets passed.");
2653 log_error("Unknown socket passed.");
2658 r = open_syslog_socket(s);
2662 r = open_native_socket(s);
2666 r = open_stdout_socket(s);
2670 r = open_proc_kmsg(s);
2674 r = open_signalfd(s);
2678 s->rate_limit = journal_rate_limit_new(s->rate_limit_interval, s->rate_limit_burst);
2682 r = system_journal_open(s);
2689 static void server_done(Server *s) {
2693 while (s->stdout_streams)
2694 stdout_stream_free(s->stdout_streams);
2696 if (s->system_journal)
2697 journal_file_close(s->system_journal);
2699 if (s->runtime_journal)
2700 journal_file_close(s->runtime_journal);
2702 while ((f = hashmap_steal_first(s->user_journals)))
2703 journal_file_close(f);
2705 hashmap_free(s->user_journals);
2707 if (s->epoll_fd >= 0)
2708 close_nointr_nofail(s->epoll_fd);
2710 if (s->signal_fd >= 0)
2711 close_nointr_nofail(s->signal_fd);
2713 if (s->syslog_fd >= 0)
2714 close_nointr_nofail(s->syslog_fd);
2716 if (s->native_fd >= 0)
2717 close_nointr_nofail(s->native_fd);
2719 if (s->stdout_fd >= 0)
2720 close_nointr_nofail(s->stdout_fd);
2722 if (s->proc_kmsg_fd >= 0)
2723 close_nointr_nofail(s->proc_kmsg_fd);
2726 journal_rate_limit_free(s->rate_limit);
2731 int main(int argc, char *argv[]) {
2735 /* if (getppid() != 1) { */
2736 /* log_error("This program should be invoked by init only."); */
2737 /* return EXIT_FAILURE; */
2741 log_error("This program does not take arguments.");
2742 return EXIT_FAILURE;
2745 log_set_target(LOG_TARGET_CONSOLE);
2746 log_parse_environment();
2751 r = server_init(&server);
2755 server_vacuum(&server);
2756 server_flush_to_var(&server);
2757 server_flush_proc_kmsg(&server);
2759 log_debug("systemd-journald running as pid %lu", (unsigned long) getpid());
2760 driver_message(&server, SD_MESSAGE_JOURNAL_START, "Journal started");
2764 "STATUS=Processing requests...");
2767 struct epoll_event event;
2769 r = epoll_wait(server.epoll_fd, &event, 1, -1);
2775 log_error("epoll_wait() failed: %m");
2781 r = process_event(&server, &event);
2788 log_debug("systemd-journald stopped as pid %lu", (unsigned long) getpid());
2789 driver_message(&server, SD_MESSAGE_JOURNAL_STOP, "Journal stopped");
2793 "STATUS=Shutting down...");
2795 server_done(&server);
2797 return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;