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 sum += (uint64_t) st.st_blocks * (uint64_t) st.st_blksize;
177 avail = sum >= m->max_use ? 0 : m->max_use - sum;
179 ss_avail = ss.f_bsize * ss.f_bavail;
181 ss_avail = ss_avail < m->keep_free ? 0 : ss_avail - m->keep_free;
183 if (ss_avail < avail)
186 s->cached_available_space = avail;
187 s->cached_available_space_timestamp = ts;
195 static void server_read_file_gid(Server *s) {
196 const char *adm = "adm";
201 if (s->file_gid_valid)
204 r = get_group_creds(&adm, &s->file_gid);
206 log_warning("Failed to resolve 'adm' group: %s", strerror(-r));
208 /* if we couldn't read the gid, then it will be 0, but that's
209 * fine and we shouldn't try to resolve the group again, so
210 * let's just pretend it worked right-away. */
211 s->file_gid_valid = true;
214 static void server_fix_perms(Server *s, JournalFile *f, uid_t uid) {
219 acl_permset_t permset;
224 server_read_file_gid(s);
226 r = fchmod_and_fchown(f->fd, 0640, 0, s->file_gid);
228 log_warning("Failed to fix access mode/rights on %s, ignoring: %s", f->path, strerror(-r));
234 acl = acl_get_fd(f->fd);
236 log_warning("Failed to read ACL on %s, ignoring: %m", f->path);
240 r = acl_find_uid(acl, uid, &entry);
243 if (acl_create_entry(&acl, &entry) < 0 ||
244 acl_set_tag_type(entry, ACL_USER) < 0 ||
245 acl_set_qualifier(entry, &uid) < 0) {
246 log_warning("Failed to patch ACL on %s, ignoring: %m", f->path);
251 if (acl_get_permset(entry, &permset) < 0 ||
252 acl_add_perm(permset, ACL_READ) < 0 ||
253 acl_calc_mask(&acl) < 0) {
254 log_warning("Failed to patch ACL on %s, ignoring: %m", f->path);
258 if (acl_set_fd(f->fd, acl) < 0)
259 log_warning("Failed to set ACL on %s, ignoring: %m", f->path);
266 static JournalFile* find_journal(Server *s, uid_t uid) {
275 /* We split up user logs only on /var, not on /run. If the
276 * runtime file is open, we write to it exclusively, in order
277 * to guarantee proper order as soon as we flush /run to
278 * /var and close the runtime file. */
280 if (s->runtime_journal)
281 return s->runtime_journal;
284 return s->system_journal;
286 r = sd_id128_get_machine(&machine);
288 return s->system_journal;
290 f = hashmap_get(s->user_journals, UINT32_TO_PTR(uid));
294 if (asprintf(&p, "/var/log/journal/%s/user-%lu.journal", sd_id128_to_string(machine, ids), (unsigned long) uid) < 0)
295 return s->system_journal;
297 while (hashmap_size(s->user_journals) >= USER_JOURNALS_MAX) {
298 /* Too many open? Then let's close one */
299 f = hashmap_steal_first(s->user_journals);
301 journal_file_close(f);
304 r = journal_file_open_reliably(p, O_RDWR|O_CREAT, 0640, s->system_journal, &f);
308 return s->system_journal;
310 server_fix_perms(s, f, uid);
311 f->metrics = s->system_metrics;
312 f->compress = s->compress;
314 r = hashmap_put(s->user_journals, UINT32_TO_PTR(uid), f);
316 journal_file_close(f);
317 return s->system_journal;
323 static void server_rotate(Server *s) {
329 log_info("Rotating...");
331 if (s->runtime_journal) {
332 r = journal_file_rotate(&s->runtime_journal);
334 log_error("Failed to rotate %s: %s", s->runtime_journal->path, strerror(-r));
337 if (s->system_journal) {
338 r = journal_file_rotate(&s->system_journal);
340 log_error("Failed to rotate %s: %s", s->system_journal->path, strerror(-r));
343 HASHMAP_FOREACH_KEY(f, k, s->user_journals, i) {
344 r = journal_file_rotate(&f);
346 log_error("Failed to rotate %s: %s", f->path, strerror(-r));
348 hashmap_replace(s->user_journals, k, f);
352 static void server_vacuum(Server *s) {
358 log_info("Vacuuming...");
360 r = sd_id128_get_machine(&machine);
362 log_error("Failed to get machine ID: %s", strerror(-r));
366 sd_id128_to_string(machine, ids);
368 if (s->system_journal) {
369 if (asprintf(&p, "/var/log/journal/%s", ids) < 0) {
370 log_error("Out of memory.");
374 r = journal_directory_vacuum(p, s->system_metrics.max_use, s->system_metrics.keep_free);
375 if (r < 0 && r != -ENOENT)
376 log_error("Failed to vacuum %s: %s", p, strerror(-r));
381 if (s->runtime_journal) {
382 if (asprintf(&p, "/run/log/journal/%s", ids) < 0) {
383 log_error("Out of memory.");
387 r = journal_directory_vacuum(p, s->runtime_metrics.max_use, s->runtime_metrics.keep_free);
388 if (r < 0 && r != -ENOENT)
389 log_error("Failed to vacuum %s: %s", p, strerror(-r));
393 s->cached_available_space_timestamp = 0;
396 static char *shortened_cgroup_path(pid_t pid) {
398 char *process_path, *init_path, *path;
402 r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, pid, &process_path);
406 r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, 1, &init_path);
412 if (endswith(init_path, "/system"))
413 init_path[strlen(init_path) - 7] = 0;
414 else if (streq(init_path, "/"))
417 if (startswith(process_path, init_path)) {
420 p = strdup(process_path + strlen(init_path));
438 static void dispatch_message_real(
440 struct iovec *iovec, unsigned n, unsigned m,
443 const char *label, size_t label_len) {
445 char *pid = NULL, *uid = NULL, *gid = NULL,
446 *source_time = NULL, *boot_id = NULL, *machine_id = NULL,
447 *comm = NULL, *cmdline = NULL, *hostname = NULL,
448 *audit_session = NULL, *audit_loginuid = NULL,
449 *exe = NULL, *cgroup = NULL, *session = NULL,
450 *owner_uid = NULL, *unit = NULL, *selinux_context = NULL;
456 uid_t loginuid = 0, realuid = 0;
458 bool vacuumed = false;
463 assert(n + N_IOVEC_META_FIELDS <= m);
469 realuid = ucred->uid;
471 if (asprintf(&pid, "_PID=%lu", (unsigned long) ucred->pid) >= 0)
472 IOVEC_SET_STRING(iovec[n++], pid);
474 if (asprintf(&uid, "_UID=%lu", (unsigned long) ucred->uid) >= 0)
475 IOVEC_SET_STRING(iovec[n++], uid);
477 if (asprintf(&gid, "_GID=%lu", (unsigned long) ucred->gid) >= 0)
478 IOVEC_SET_STRING(iovec[n++], gid);
480 r = get_process_comm(ucred->pid, &t);
482 comm = strappend("_COMM=", t);
486 IOVEC_SET_STRING(iovec[n++], comm);
489 r = get_process_exe(ucred->pid, &t);
491 exe = strappend("_EXE=", t);
495 IOVEC_SET_STRING(iovec[n++], exe);
498 r = get_process_cmdline(ucred->pid, LINE_MAX, false, &t);
500 cmdline = strappend("_CMDLINE=", t);
504 IOVEC_SET_STRING(iovec[n++], cmdline);
507 r = audit_session_from_pid(ucred->pid, &audit);
509 if (asprintf(&audit_session, "_AUDIT_SESSION=%lu", (unsigned long) audit) >= 0)
510 IOVEC_SET_STRING(iovec[n++], audit_session);
512 r = audit_loginuid_from_pid(ucred->pid, &loginuid);
514 if (asprintf(&audit_loginuid, "_AUDIT_LOGINUID=%lu", (unsigned long) loginuid) >= 0)
515 IOVEC_SET_STRING(iovec[n++], audit_loginuid);
517 t = shortened_cgroup_path(ucred->pid);
519 cgroup = strappend("_SYSTEMD_CGROUP=", t);
523 IOVEC_SET_STRING(iovec[n++], cgroup);
526 if (sd_pid_get_session(ucred->pid, &t) >= 0) {
527 session = strappend("_SYSTEMD_SESSION=", t);
531 IOVEC_SET_STRING(iovec[n++], session);
534 if (sd_pid_get_unit(ucred->pid, &t) >= 0) {
535 unit = strappend("_SYSTEMD_UNIT=", t);
539 IOVEC_SET_STRING(iovec[n++], unit);
542 if (sd_pid_get_owner_uid(ucred->uid, &owner) >= 0)
543 if (asprintf(&owner_uid, "_SYSTEMD_OWNER_UID=%lu", (unsigned long) owner) >= 0)
544 IOVEC_SET_STRING(iovec[n++], owner_uid);
548 selinux_context = malloc(sizeof("_SELINUX_CONTEXT=") + label_len);
549 if (selinux_context) {
550 memcpy(selinux_context, "_SELINUX_CONTEXT=", sizeof("_SELINUX_CONTEXT=")-1);
551 memcpy(selinux_context+sizeof("_SELINUX_CONTEXT=")-1, label, label_len);
552 selinux_context[sizeof("_SELINUX_CONTEXT=")-1+label_len] = 0;
553 IOVEC_SET_STRING(iovec[n++], selinux_context);
556 security_context_t con;
558 if (getpidcon(ucred->pid, &con) >= 0) {
559 selinux_context = strappend("_SELINUX_CONTEXT=", con);
561 IOVEC_SET_STRING(iovec[n++], selinux_context);
570 if (asprintf(&source_time, "_SOURCE_REALTIME_TIMESTAMP=%llu",
571 (unsigned long long) timeval_load(tv)) >= 0)
572 IOVEC_SET_STRING(iovec[n++], source_time);
575 /* Note that strictly speaking storing the boot id here is
576 * redundant since the entry includes this in-line
577 * anyway. However, we need this indexed, too. */
578 r = sd_id128_get_boot(&id);
580 if (asprintf(&boot_id, "_BOOT_ID=%s", sd_id128_to_string(id, idbuf)) >= 0)
581 IOVEC_SET_STRING(iovec[n++], boot_id);
583 r = sd_id128_get_machine(&id);
585 if (asprintf(&machine_id, "_MACHINE_ID=%s", sd_id128_to_string(id, idbuf)) >= 0)
586 IOVEC_SET_STRING(iovec[n++], machine_id);
588 t = gethostname_malloc();
590 hostname = strappend("_HOSTNAME=", t);
593 IOVEC_SET_STRING(iovec[n++], hostname);
598 server_flush_to_var(s);
601 f = find_journal(s, realuid == 0 ? 0 : loginuid);
603 log_warning("Dropping message, as we can't find a place to store the data.");
605 r = journal_file_append_entry(f, NULL, iovec, n, &s->seqnum, NULL, NULL);
607 if ((r == -EBADMSG || r == -E2BIG) && !vacuumed) {
610 log_info("Allocation limit reached, rotating.");
612 log_warning("Journal file corrupted, rotating.");
618 log_info("Retrying write.");
623 log_error("Failed to write entry, ignoring: %s", strerror(-r));
637 free(audit_loginuid);
642 free(selinux_context);
645 static void driver_message(Server *s, sd_id128_t message_id, const char *format, ...) {
646 char mid[11 + 32 + 1];
647 char buffer[16 + LINE_MAX + 1];
648 struct iovec iovec[N_IOVEC_META_FIELDS + 4];
656 IOVEC_SET_STRING(iovec[n++], "PRIORITY=5");
657 IOVEC_SET_STRING(iovec[n++], "_TRANSPORT=driver");
659 memcpy(buffer, "MESSAGE=", 8);
660 va_start(ap, format);
661 vsnprintf(buffer + 8, sizeof(buffer) - 8, format, ap);
663 char_array_0(buffer);
664 IOVEC_SET_STRING(iovec[n++], buffer);
666 snprintf(mid, sizeof(mid), "MESSAGE_ID=" SD_ID128_FORMAT_STR, SD_ID128_FORMAT_VAL(message_id));
668 IOVEC_SET_STRING(iovec[n++], mid);
671 ucred.pid = getpid();
672 ucred.uid = getuid();
673 ucred.gid = getgid();
675 dispatch_message_real(s, iovec, n, ELEMENTSOF(iovec), &ucred, NULL, NULL, 0);
678 static void dispatch_message(Server *s,
679 struct iovec *iovec, unsigned n, unsigned m,
682 const char *label, size_t label_len,
685 char *path = NULL, *c;
688 assert(iovec || n == 0);
696 path = shortened_cgroup_path(ucred->pid);
700 /* example: /user/lennart/3/foobar
701 * /system/dbus.service/foobar
703 * So let's cut of everything past the third /, since that is
704 * wher user directories start */
706 c = strchr(path, '/');
708 c = strchr(c+1, '/');
710 c = strchr(c+1, '/');
716 rl = journal_rate_limit_test(s->rate_limit, path, priority & LOG_PRIMASK, available_space(s));
723 /* Write a suppression message if we suppressed something */
725 driver_message(s, SD_MESSAGE_JOURNAL_DROPPED, "Suppressed %u messages from %s", rl - 1, path);
730 dispatch_message_real(s, iovec, n, m, ucred, tv, label, label_len);
733 static void forward_syslog_iovec(Server *s, const struct iovec *iovec, unsigned n_iovec, struct ucred *ucred, struct timeval *tv) {
734 struct msghdr msghdr;
735 struct cmsghdr *cmsg;
737 struct cmsghdr cmsghdr;
738 uint8_t buf[CMSG_SPACE(sizeof(struct ucred))];
740 union sockaddr_union sa;
747 msghdr.msg_iov = (struct iovec*) iovec;
748 msghdr.msg_iovlen = n_iovec;
751 sa.un.sun_family = AF_UNIX;
752 strncpy(sa.un.sun_path, "/run/systemd/journal/syslog", sizeof(sa.un.sun_path));
753 msghdr.msg_name = &sa;
754 msghdr.msg_namelen = offsetof(union sockaddr_union, un.sun_path) + strlen(sa.un.sun_path);
758 msghdr.msg_control = &control;
759 msghdr.msg_controllen = sizeof(control);
761 cmsg = CMSG_FIRSTHDR(&msghdr);
762 cmsg->cmsg_level = SOL_SOCKET;
763 cmsg->cmsg_type = SCM_CREDENTIALS;
764 cmsg->cmsg_len = CMSG_LEN(sizeof(struct ucred));
765 memcpy(CMSG_DATA(cmsg), ucred, sizeof(struct ucred));
766 msghdr.msg_controllen = cmsg->cmsg_len;
769 /* Forward the syslog message we received via /dev/log to
770 * /run/systemd/syslog. Unfortunately we currently can't set
771 * the SO_TIMESTAMP auxiliary data, and hence we don't. */
773 if (sendmsg(s->syslog_fd, &msghdr, MSG_NOSIGNAL) >= 0)
776 /* The socket is full? I guess the syslog implementation is
777 * too slow, and we shouldn't wait for that... */
781 if (ucred && errno == ESRCH) {
784 /* Hmm, presumably the sender process vanished
785 * by now, so let's fix it as good as we
790 memcpy(CMSG_DATA(cmsg), &u, sizeof(struct ucred));
792 if (sendmsg(s->syslog_fd, &msghdr, MSG_NOSIGNAL) >= 0)
799 log_debug("Failed to forward syslog message: %m");
802 static void forward_syslog_raw(Server *s, const char *buffer, struct ucred *ucred, struct timeval *tv) {
808 IOVEC_SET_STRING(iovec, buffer);
809 forward_syslog_iovec(s, &iovec, 1, ucred, tv);
812 static void forward_syslog(Server *s, int priority, const char *identifier, const char *message, struct ucred *ucred, struct timeval *tv) {
813 struct iovec iovec[5];
814 char header_priority[6], header_time[64], header_pid[16];
818 char *ident_buf = NULL;
821 assert(priority >= 0);
822 assert(priority <= 999);
825 /* First: priority field */
826 snprintf(header_priority, sizeof(header_priority), "<%i>", priority);
827 char_array_0(header_priority);
828 IOVEC_SET_STRING(iovec[n++], header_priority);
830 /* Second: timestamp */
831 t = tv ? tv->tv_sec : ((time_t) (now(CLOCK_REALTIME) / USEC_PER_SEC));
835 if (strftime(header_time, sizeof(header_time), "%h %e %T ", tm) <= 0)
837 IOVEC_SET_STRING(iovec[n++], header_time);
839 /* Third: identifier and PID */
842 get_process_comm(ucred->pid, &ident_buf);
843 identifier = ident_buf;
846 snprintf(header_pid, sizeof(header_pid), "[%lu]: ", (unsigned long) ucred->pid);
847 char_array_0(header_pid);
850 IOVEC_SET_STRING(iovec[n++], identifier);
852 IOVEC_SET_STRING(iovec[n++], header_pid);
853 } else if (identifier) {
854 IOVEC_SET_STRING(iovec[n++], identifier);
855 IOVEC_SET_STRING(iovec[n++], ": ");
858 /* Fourth: message */
859 IOVEC_SET_STRING(iovec[n++], message);
861 forward_syslog_iovec(s, iovec, n, ucred, tv);
866 static int fixup_priority(int priority) {
868 if ((priority & LOG_FACMASK) == 0)
869 return (priority & LOG_PRIMASK) | LOG_USER;
874 static void forward_kmsg(Server *s, int priority, const char *identifier, const char *message, struct ucred *ucred) {
875 struct iovec iovec[5];
876 char header_priority[6], header_pid[16];
878 char *ident_buf = NULL;
882 assert(priority >= 0);
883 assert(priority <= 999);
886 /* Never allow messages with kernel facility to be written to
887 * kmsg, regardless where the data comes from. */
888 priority = fixup_priority(priority);
890 /* First: priority field */
891 snprintf(header_priority, sizeof(header_priority), "<%i>", priority);
892 char_array_0(header_priority);
893 IOVEC_SET_STRING(iovec[n++], header_priority);
895 /* Second: identifier and PID */
898 get_process_comm(ucred->pid, &ident_buf);
899 identifier = ident_buf;
902 snprintf(header_pid, sizeof(header_pid), "[%lu]: ", (unsigned long) ucred->pid);
903 char_array_0(header_pid);
906 IOVEC_SET_STRING(iovec[n++], identifier);
908 IOVEC_SET_STRING(iovec[n++], header_pid);
909 } else if (identifier) {
910 IOVEC_SET_STRING(iovec[n++], identifier);
911 IOVEC_SET_STRING(iovec[n++], ": ");
914 /* Fourth: message */
915 IOVEC_SET_STRING(iovec[n++], message);
916 IOVEC_SET_STRING(iovec[n++], "\n");
918 fd = open("/dev/kmsg", O_WRONLY|O_NOCTTY|O_CLOEXEC);
920 log_debug("Failed to open /dev/kmsg for logging: %s", strerror(errno));
924 if (writev(fd, iovec, n) < 0)
925 log_debug("Failed to write to /dev/kmsg for logging: %s", strerror(errno));
927 close_nointr_nofail(fd);
933 static void forward_console(Server *s, const char *identifier, const char *message, struct ucred *ucred) {
934 struct iovec iovec[4];
937 char *ident_buf = NULL;
942 /* First: identifier and PID */
945 get_process_comm(ucred->pid, &ident_buf);
946 identifier = ident_buf;
949 snprintf(header_pid, sizeof(header_pid), "[%lu]: ", (unsigned long) ucred->pid);
950 char_array_0(header_pid);
953 IOVEC_SET_STRING(iovec[n++], identifier);
955 IOVEC_SET_STRING(iovec[n++], header_pid);
956 } else if (identifier) {
957 IOVEC_SET_STRING(iovec[n++], identifier);
958 IOVEC_SET_STRING(iovec[n++], ": ");
962 IOVEC_SET_STRING(iovec[n++], message);
963 IOVEC_SET_STRING(iovec[n++], "\n");
965 fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC);
967 log_debug("Failed to open /dev/console for logging: %s", strerror(errno));
971 if (writev(fd, iovec, n) < 0)
972 log_debug("Failed to write to /dev/console for logging: %s", strerror(errno));
974 close_nointr_nofail(fd);
980 static void read_identifier(const char **buf, char **identifier, char **pid) {
991 p += strspn(p, WHITESPACE);
992 l = strcspn(p, WHITESPACE);
1001 if (p[l-1] == ']') {
1007 t = strndup(p+k+1, l-k-2);
1027 *buf += strspn(*buf, WHITESPACE);
1030 static void process_syslog_message(Server *s, const char *buf, struct ucred *ucred, struct timeval *tv, const char *label, size_t label_len) {
1031 char *message = NULL, *syslog_priority = NULL, *syslog_facility = NULL, *syslog_identifier = NULL, *syslog_pid = NULL;
1032 struct iovec iovec[N_IOVEC_META_FIELDS + 6];
1034 int priority = LOG_USER | LOG_INFO;
1035 char *identifier = NULL, *pid = NULL;
1040 if (s->forward_to_syslog)
1041 forward_syslog_raw(s, buf, ucred, tv);
1043 parse_syslog_priority((char**) &buf, &priority);
1044 skip_syslog_date((char**) &buf);
1045 read_identifier(&buf, &identifier, &pid);
1047 if (s->forward_to_kmsg)
1048 forward_kmsg(s, priority, identifier, buf, ucred);
1050 if (s->forward_to_console)
1051 forward_console(s, identifier, buf, ucred);
1053 IOVEC_SET_STRING(iovec[n++], "_TRANSPORT=syslog");
1055 if (asprintf(&syslog_priority, "PRIORITY=%i", priority & LOG_PRIMASK) >= 0)
1056 IOVEC_SET_STRING(iovec[n++], syslog_priority);
1058 if (priority & LOG_FACMASK)
1059 if (asprintf(&syslog_facility, "SYSLOG_FACILITY=%i", LOG_FAC(priority)) >= 0)
1060 IOVEC_SET_STRING(iovec[n++], syslog_facility);
1063 syslog_identifier = strappend("SYSLOG_IDENTIFIER=", identifier);
1064 if (syslog_identifier)
1065 IOVEC_SET_STRING(iovec[n++], syslog_identifier);
1069 syslog_pid = strappend("SYSLOG_PID=", pid);
1071 IOVEC_SET_STRING(iovec[n++], syslog_pid);
1074 message = strappend("MESSAGE=", buf);
1076 IOVEC_SET_STRING(iovec[n++], message);
1078 dispatch_message(s, iovec, n, ELEMENTSOF(iovec), ucred, tv, label, label_len, priority);
1083 free(syslog_priority);
1084 free(syslog_facility);
1085 free(syslog_identifier);
1088 static bool valid_user_field(const char *p, size_t l) {
1091 /* We kinda enforce POSIX syntax recommendations for
1092 environment variables here, but make a couple of additional
1095 http://pubs.opengroup.org/onlinepubs/000095399/basedefs/xbd_chap08.html */
1097 /* No empty field names */
1101 /* Don't allow names longer than 64 chars */
1105 /* Variables starting with an underscore are protected */
1109 /* Don't allow digits as first character */
1110 if (p[0] >= '0' && p[0] <= '9')
1113 /* Only allow A-Z0-9 and '_' */
1114 for (a = p; a < p + l; a++)
1115 if (!((*a >= 'A' && *a <= 'Z') ||
1116 (*a >= '0' && *a <= '9') ||
1123 static void process_native_message(
1125 const void *buffer, size_t buffer_size,
1126 struct ucred *ucred,
1128 const char *label, size_t label_len) {
1130 struct iovec *iovec = NULL;
1131 unsigned n = 0, m = 0, j, tn = (unsigned) -1;
1134 int priority = LOG_INFO;
1135 char *identifier = NULL, *message = NULL;
1138 assert(buffer || n == 0);
1141 remaining = buffer_size;
1143 while (remaining > 0) {
1146 e = memchr(p, '\n', remaining);
1149 /* Trailing noise, let's ignore it, and flush what we collected */
1150 log_debug("Received message with trailing noise, ignoring.");
1155 /* Entry separator */
1156 dispatch_message(s, iovec, n, m, ucred, tv, label, label_len, priority);
1158 priority = LOG_INFO;
1165 if (*p == '.' || *p == '#') {
1166 /* Ignore control commands for now, and
1168 remaining -= (e - p) + 1;
1173 /* A property follows */
1175 if (n+N_IOVEC_META_FIELDS >= m) {
1179 u = MAX((n+N_IOVEC_META_FIELDS+1) * 2U, 4U);
1180 c = realloc(iovec, u * sizeof(struct iovec));
1182 log_error("Out of memory");
1190 q = memchr(p, '=', e - p);
1192 if (valid_user_field(p, q - p)) {
1197 /* If the field name starts with an
1198 * underscore, skip the variable,
1199 * since that indidates a trusted
1201 iovec[n].iov_base = (char*) p;
1202 iovec[n].iov_len = l;
1205 /* We need to determine the priority
1206 * of this entry for the rate limiting
1209 memcmp(p, "PRIORITY=", 9) == 0 &&
1210 p[9] >= '0' && p[9] <= '9')
1211 priority = (priority & LOG_FACMASK) | (p[9] - '0');
1214 memcmp(p, "SYSLOG_FACILITY=", 16) == 0 &&
1215 p[16] >= '0' && p[16] <= '9')
1216 priority = (priority & LOG_PRIMASK) | ((p[16] - '0') << 3);
1219 memcmp(p, "SYSLOG_FACILITY=", 16) == 0 &&
1220 p[16] >= '0' && p[16] <= '9' &&
1221 p[17] >= '0' && p[17] <= '9')
1222 priority = (priority & LOG_PRIMASK) | (((p[16] - '0')*10 + (p[17] - '0')) << 3);
1225 memcmp(p, "SYSLOG_IDENTIFIER=", 11) == 0) {
1228 t = strndup(p + 11, l - 11);
1233 } else if (l >= 8 &&
1234 memcmp(p, "MESSAGE=", 8) == 0) {
1237 t = strndup(p + 8, l - 8);
1245 remaining -= (e - p) + 1;
1252 if (remaining < e - p + 1 + sizeof(uint64_t) + 1) {
1253 log_debug("Failed to parse message, ignoring.");
1257 memcpy(&l, e + 1, sizeof(uint64_t));
1260 if (remaining < e - p + 1 + sizeof(uint64_t) + l + 1 ||
1261 e[1+sizeof(uint64_t)+l] != '\n') {
1262 log_debug("Failed to parse message, ignoring.");
1266 k = malloc((e - p) + 1 + l);
1268 log_error("Out of memory");
1272 memcpy(k, p, e - p);
1274 memcpy(k + (e - p) + 1, e + 1 + sizeof(uint64_t), l);
1276 if (valid_user_field(p, e - p)) {
1277 iovec[n].iov_base = k;
1278 iovec[n].iov_len = (e - p) + 1 + l;
1283 remaining -= (e - p) + 1 + sizeof(uint64_t) + l + 1;
1284 p = e + 1 + sizeof(uint64_t) + l + 1;
1292 IOVEC_SET_STRING(iovec[tn], "_TRANSPORT=journal");
1295 if (s->forward_to_syslog)
1296 forward_syslog(s, priority, identifier, message, ucred, tv);
1298 if (s->forward_to_kmsg)
1299 forward_kmsg(s, priority, identifier, message, ucred);
1301 if (s->forward_to_console)
1302 forward_console(s, identifier, message, ucred);
1305 dispatch_message(s, iovec, n, m, ucred, tv, label, label_len, priority);
1308 for (j = 0; j < n; j++) {
1312 if (iovec[j].iov_base < buffer ||
1313 (const uint8_t*) iovec[j].iov_base >= (const uint8_t*) buffer + buffer_size)
1314 free(iovec[j].iov_base);
1322 static void process_native_file(
1325 struct ucred *ucred,
1327 const char *label, size_t label_len) {
1336 /* Data is in the passed file, since it didn't fit in a
1337 * datagram. We can't map the file here, since clients might
1338 * then truncate it and trigger a SIGBUS for us. So let's
1339 * stupidly read it */
1341 if (fstat(fd, &st) < 0) {
1342 log_error("Failed to stat passed file, ignoring: %m");
1346 if (!S_ISREG(st.st_mode)) {
1347 log_error("File passed is not regular. Ignoring.");
1351 if (st.st_size <= 0)
1354 if (st.st_size > ENTRY_SIZE_MAX) {
1355 log_error("File passed too large. Ignoring.");
1359 p = malloc(st.st_size);
1361 log_error("Out of memory");
1365 n = pread(fd, p, st.st_size, 0);
1367 log_error("Failed to read file, ignoring: %s", strerror(-n));
1369 process_native_message(s, p, n, ucred, tv, label, label_len);
1374 static int stdout_stream_log(StdoutStream *s, const char *p) {
1375 struct iovec iovec[N_IOVEC_META_FIELDS + 5];
1376 char *message = NULL, *syslog_priority = NULL, *syslog_facility = NULL, *syslog_identifier = NULL;
1380 size_t label_len = 0;
1388 priority = s->priority;
1390 if (s->level_prefix)
1391 parse_syslog_priority((char**) &p, &priority);
1393 if (s->forward_to_syslog || s->server->forward_to_syslog)
1394 forward_syslog(s->server, fixup_priority(priority), s->identifier, p, &s->ucred, NULL);
1396 if (s->forward_to_kmsg || s->server->forward_to_kmsg)
1397 forward_kmsg(s->server, priority, s->identifier, p, &s->ucred);
1399 if (s->forward_to_console || s->server->forward_to_console)
1400 forward_console(s->server, s->identifier, p, &s->ucred);
1402 IOVEC_SET_STRING(iovec[n++], "_TRANSPORT=stdout");
1404 if (asprintf(&syslog_priority, "PRIORITY=%i", priority & LOG_PRIMASK) >= 0)
1405 IOVEC_SET_STRING(iovec[n++], syslog_priority);
1407 if (priority & LOG_FACMASK)
1408 if (asprintf(&syslog_facility, "SYSLOG_FACILITY=%i", LOG_FAC(priority)) >= 0)
1409 IOVEC_SET_STRING(iovec[n++], syslog_facility);
1411 if (s->identifier) {
1412 syslog_identifier = strappend("SYSLOG_IDENTIFIER=", s->identifier);
1413 if (syslog_identifier)
1414 IOVEC_SET_STRING(iovec[n++], syslog_identifier);
1417 message = strappend("MESSAGE=", p);
1419 IOVEC_SET_STRING(iovec[n++], message);
1422 if (s->security_context) {
1423 label = (char*) s->security_context;
1424 label_len = strlen((char*) s->security_context);
1428 dispatch_message(s->server, iovec, n, ELEMENTSOF(iovec), &s->ucred, NULL, label, label_len, priority);
1431 free(syslog_priority);
1432 free(syslog_facility);
1433 free(syslog_identifier);
1438 static int stdout_stream_line(StdoutStream *s, char *p) {
1448 case STDOUT_STREAM_IDENTIFIER:
1450 s->identifier = NULL;
1452 s->identifier = strdup(p);
1453 if (!s->identifier) {
1454 log_error("Out of memory");
1459 s->state = STDOUT_STREAM_PRIORITY;
1462 case STDOUT_STREAM_PRIORITY:
1463 r = safe_atoi(p, &s->priority);
1464 if (r < 0 || s->priority <= 0 || s->priority >= 999) {
1465 log_warning("Failed to parse log priority line.");
1469 s->state = STDOUT_STREAM_LEVEL_PREFIX;
1472 case STDOUT_STREAM_LEVEL_PREFIX:
1473 r = parse_boolean(p);
1475 log_warning("Failed to parse level prefix line.");
1479 s->level_prefix = !!r;
1480 s->state = STDOUT_STREAM_FORWARD_TO_SYSLOG;
1483 case STDOUT_STREAM_FORWARD_TO_SYSLOG:
1484 r = parse_boolean(p);
1486 log_warning("Failed to parse forward to syslog line.");
1490 s->forward_to_syslog = !!r;
1491 s->state = STDOUT_STREAM_FORWARD_TO_KMSG;
1494 case STDOUT_STREAM_FORWARD_TO_KMSG:
1495 r = parse_boolean(p);
1497 log_warning("Failed to parse copy to kmsg line.");
1501 s->forward_to_kmsg = !!r;
1502 s->state = STDOUT_STREAM_FORWARD_TO_CONSOLE;
1505 case STDOUT_STREAM_FORWARD_TO_CONSOLE:
1506 r = parse_boolean(p);
1508 log_warning("Failed to parse copy to console line.");
1512 s->forward_to_console = !!r;
1513 s->state = STDOUT_STREAM_RUNNING;
1516 case STDOUT_STREAM_RUNNING:
1517 return stdout_stream_log(s, p);
1520 assert_not_reached("Unknown stream state");
1523 static int stdout_stream_scan(StdoutStream *s, bool force_flush) {
1531 remaining = s->length;
1536 end = memchr(p, '\n', remaining);
1539 else if (remaining >= sizeof(s->buffer) - 1) {
1540 end = p + sizeof(s->buffer) - 1;
1547 r = stdout_stream_line(s, p);
1555 if (force_flush && remaining > 0) {
1557 r = stdout_stream_line(s, p);
1565 if (p > s->buffer) {
1566 memmove(s->buffer, p, remaining);
1567 s->length = remaining;
1573 static int stdout_stream_process(StdoutStream *s) {
1579 l = read(s->fd, s->buffer+s->length, sizeof(s->buffer)-1-s->length);
1582 if (errno == EAGAIN)
1585 log_warning("Failed to read from stream: %m");
1590 r = stdout_stream_scan(s, true);
1598 r = stdout_stream_scan(s, false);
1606 static void stdout_stream_free(StdoutStream *s) {
1610 assert(s->server->n_stdout_streams > 0);
1611 s->server->n_stdout_streams --;
1612 LIST_REMOVE(StdoutStream, stdout_stream, s->server->stdout_streams, s);
1617 epoll_ctl(s->server->epoll_fd, EPOLL_CTL_DEL, s->fd, NULL);
1619 close_nointr_nofail(s->fd);
1623 if (s->security_context)
1624 freecon(s->security_context);
1627 free(s->identifier);
1631 static int stdout_stream_new(Server *s) {
1632 StdoutStream *stream;
1635 struct epoll_event ev;
1639 fd = accept4(s->stdout_fd, NULL, NULL, SOCK_NONBLOCK|SOCK_CLOEXEC);
1641 if (errno == EAGAIN)
1644 log_error("Failed to accept stdout connection: %m");
1648 if (s->n_stdout_streams >= STDOUT_STREAMS_MAX) {
1649 log_warning("Too many stdout streams, refusing connection.");
1650 close_nointr_nofail(fd);
1654 stream = new0(StdoutStream, 1);
1656 log_error("Out of memory.");
1657 close_nointr_nofail(fd);
1663 len = sizeof(stream->ucred);
1664 if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &stream->ucred, &len) < 0) {
1665 log_error("Failed to determine peer credentials: %m");
1671 if (getpeercon(fd, &stream->security_context) < 0)
1672 log_error("Failed to determine peer security context.");
1675 if (shutdown(fd, SHUT_WR) < 0) {
1676 log_error("Failed to shutdown writing side of socket: %m");
1682 ev.data.ptr = stream;
1683 ev.events = EPOLLIN;
1684 if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0) {
1685 log_error("Failed to add stream to event loop: %m");
1691 LIST_PREPEND(StdoutStream, stdout_stream, s->stdout_streams, stream);
1692 s->n_stdout_streams ++;
1697 stdout_stream_free(stream);
1701 static int parse_kernel_timestamp(char **_p, usec_t *t) {
1712 if (strlen(p) < 14 || p[0] != '[' || p[13] != ']' || p[6] != '.')
1717 for (i = 1; i <= 5; i++) {
1723 k = undecchar(p[i]);
1730 for (i = 7; i <= 12; i++) {
1733 k = undecchar(p[i]);
1742 *_p += strspn(*_p, WHITESPACE);
1747 static void proc_kmsg_line(Server *s, const char *p) {
1748 struct iovec iovec[N_IOVEC_META_FIELDS + 7];
1749 char *message = NULL, *syslog_priority = NULL, *syslog_pid = NULL, *syslog_facility = NULL, *syslog_identifier = NULL, *source_time = NULL;
1750 int priority = LOG_KERN | LOG_INFO;
1753 char *identifier = NULL, *pid = NULL;
1761 parse_syslog_priority((char **) &p, &priority);
1763 if (s->forward_to_kmsg && (priority & LOG_FACMASK) != LOG_KERN)
1766 if (parse_kernel_timestamp((char **) &p, &usec) > 0) {
1767 if (asprintf(&source_time, "_SOURCE_MONOTONIC_TIMESTAMP=%llu",
1768 (unsigned long long) usec) >= 0)
1769 IOVEC_SET_STRING(iovec[n++], source_time);
1772 IOVEC_SET_STRING(iovec[n++], "_TRANSPORT=kernel");
1774 if (asprintf(&syslog_priority, "PRIORITY=%i", priority & LOG_PRIMASK) >= 0)
1775 IOVEC_SET_STRING(iovec[n++], syslog_priority);
1777 if ((priority & LOG_FACMASK) == LOG_KERN) {
1779 if (s->forward_to_syslog)
1780 forward_syslog(s, priority, "kernel", p, NULL, NULL);
1782 IOVEC_SET_STRING(iovec[n++], "SYSLOG_IDENTIFIER=kernel");
1784 read_identifier(&p, &identifier, &pid);
1786 if (s->forward_to_syslog)
1787 forward_syslog(s, priority, identifier, p, NULL, NULL);
1790 syslog_identifier = strappend("SYSLOG_IDENTIFIER=", identifier);
1791 if (syslog_identifier)
1792 IOVEC_SET_STRING(iovec[n++], syslog_identifier);
1796 syslog_pid = strappend("SYSLOG_PID=", pid);
1798 IOVEC_SET_STRING(iovec[n++], syslog_pid);
1801 if (asprintf(&syslog_facility, "SYSLOG_FACILITY=%i", LOG_FAC(priority)) >= 0)
1802 IOVEC_SET_STRING(iovec[n++], syslog_facility);
1805 message = strappend("MESSAGE=", p);
1807 IOVEC_SET_STRING(iovec[n++], message);
1809 dispatch_message(s, iovec, n, ELEMENTSOF(iovec), NULL, NULL, NULL, 0, priority);
1812 free(syslog_priority);
1813 free(syslog_identifier);
1815 free(syslog_facility);
1821 static void proc_kmsg_scan(Server *s) {
1827 p = s->proc_kmsg_buffer;
1828 remaining = s->proc_kmsg_length;
1833 end = memchr(p, '\n', remaining);
1836 else if (remaining >= sizeof(s->proc_kmsg_buffer) - 1) {
1837 end = p + sizeof(s->proc_kmsg_buffer) - 1;
1844 proc_kmsg_line(s, p);
1850 if (p > s->proc_kmsg_buffer) {
1851 memmove(s->proc_kmsg_buffer, p, remaining);
1852 s->proc_kmsg_length = remaining;
1856 static int system_journal_open(Server *s) {
1862 r = sd_id128_get_machine(&machine);
1866 sd_id128_to_string(machine, ids);
1868 if (!s->system_journal) {
1870 /* First try to create the machine path, but not the prefix */
1871 fn = strappend("/var/log/journal/", ids);
1874 (void) mkdir(fn, 0755);
1877 /* The create the system journal file */
1878 fn = join("/var/log/journal/", ids, "/system.journal", NULL);
1882 r = journal_file_open_reliably(fn, O_RDWR|O_CREAT, 0640, NULL, &s->system_journal);
1886 journal_default_metrics(&s->system_metrics, s->system_journal->fd);
1888 s->system_journal->metrics = s->system_metrics;
1889 s->system_journal->compress = s->compress;
1891 server_fix_perms(s, s->system_journal, 0);
1894 if (r != -ENOENT && r != -EROFS)
1895 log_warning("Failed to open system journal: %s", strerror(-r));
1901 if (!s->runtime_journal) {
1903 fn = join("/run/log/journal/", ids, "/system.journal", NULL);
1907 if (s->system_journal) {
1909 /* Try to open the runtime journal, but only
1910 * if it already exists, so that we can flush
1911 * it into the system journal */
1913 r = journal_file_open_reliably(fn, O_RDWR, 0640, NULL, &s->runtime_journal);
1918 log_warning("Failed to open runtime journal: %s", strerror(-r));
1925 /* OK, we really need the runtime journal, so create
1926 * it if necessary. */
1928 (void) mkdir_parents(fn, 0755);
1929 r = journal_file_open_reliably(fn, O_RDWR|O_CREAT, 0640, NULL, &s->runtime_journal);
1933 log_error("Failed to open runtime journal: %s", strerror(-r));
1938 if (s->runtime_journal) {
1939 journal_default_metrics(&s->runtime_metrics, s->runtime_journal->fd);
1941 s->runtime_journal->metrics = s->runtime_metrics;
1942 s->runtime_journal->compress = s->compress;
1944 server_fix_perms(s, s->runtime_journal, 0);
1951 static int server_flush_to_var(Server *s) {
1952 char path[] = "/run/log/journal/xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
1961 if (!s->runtime_journal)
1964 ts = now(CLOCK_MONOTONIC);
1965 if (s->var_available_timestamp + RECHECK_VAR_AVAILABLE_USEC > ts)
1968 s->var_available_timestamp = ts;
1970 system_journal_open(s);
1972 if (!s->system_journal)
1975 log_info("Flushing to /var...");
1977 r = sd_id128_get_machine(&machine);
1979 log_error("Failed to get machine id: %s", strerror(-r));
1983 r = sd_journal_open(&j, SD_JOURNAL_RUNTIME_ONLY);
1985 log_error("Failed to read runtime journal: %s", strerror(-r));
1989 SD_JOURNAL_FOREACH(j) {
1992 f = j->current_file;
1993 assert(f && f->current_offset > 0);
1995 r = journal_file_move_to_object(f, OBJECT_ENTRY, f->current_offset, &o);
1997 log_error("Can't read entry: %s", strerror(-r));
2001 r = journal_file_copy_entry(f, s->system_journal, o, f->current_offset, NULL, NULL, NULL);
2003 log_info("Allocation limit reached.");
2005 journal_file_post_change(s->system_journal);
2009 r = journal_file_copy_entry(f, s->system_journal, o, f->current_offset, NULL, NULL, NULL);
2013 log_error("Can't write entry: %s", strerror(-r));
2019 journal_file_post_change(s->system_journal);
2021 journal_file_close(s->runtime_journal);
2022 s->runtime_journal = NULL;
2025 sd_id128_to_string(machine, path + 17);
2026 rm_rf(path, false, true, false);
2032 static int server_read_proc_kmsg(Server *s) {
2035 assert(s->proc_kmsg_fd >= 0);
2037 l = read(s->proc_kmsg_fd, s->proc_kmsg_buffer + s->proc_kmsg_length, sizeof(s->proc_kmsg_buffer) - 1 - s->proc_kmsg_length);
2040 if (errno == EAGAIN || errno == EINTR)
2043 log_error("Failed to read from kernel: %m");
2047 s->proc_kmsg_length += l;
2053 static int server_flush_proc_kmsg(Server *s) {
2058 if (s->proc_kmsg_fd < 0)
2061 log_info("Flushing /proc/kmsg...");
2064 r = server_read_proc_kmsg(s);
2075 static int process_event(Server *s, struct epoll_event *ev) {
2078 if (ev->data.fd == s->signal_fd) {
2079 struct signalfd_siginfo sfsi;
2082 if (ev->events != EPOLLIN) {
2083 log_info("Got invalid event from epoll.");
2087 n = read(s->signal_fd, &sfsi, sizeof(sfsi));
2088 if (n != sizeof(sfsi)) {
2093 if (errno == EINTR || errno == EAGAIN)
2099 if (sfsi.ssi_signo == SIGUSR1) {
2100 server_flush_to_var(s);
2104 log_debug("Received SIG%s", signal_to_string(sfsi.ssi_signo));
2107 } else if (ev->data.fd == s->proc_kmsg_fd) {
2110 if (ev->events != EPOLLIN) {
2111 log_info("Got invalid event from epoll.");
2115 r = server_read_proc_kmsg(s);
2121 } else if (ev->data.fd == s->native_fd ||
2122 ev->data.fd == s->syslog_fd) {
2124 if (ev->events != EPOLLIN) {
2125 log_info("Got invalid event from epoll.");
2130 struct msghdr msghdr;
2132 struct ucred *ucred = NULL;
2133 struct timeval *tv = NULL;
2134 struct cmsghdr *cmsg;
2136 size_t label_len = 0;
2138 struct cmsghdr cmsghdr;
2139 uint8_t buf[CMSG_SPACE(sizeof(struct ucred)) +
2140 CMSG_SPACE(sizeof(struct timeval)) +
2141 CMSG_SPACE(sizeof(int)) +
2142 CMSG_SPACE(PAGE_SIZE)]; /* selinux label */
2149 if (ioctl(ev->data.fd, SIOCINQ, &v) < 0) {
2150 log_error("SIOCINQ failed: %m");
2154 if (s->buffer_size < (size_t) v) {
2158 l = MAX(LINE_MAX + (size_t) v, s->buffer_size * 2);
2159 b = realloc(s->buffer, l+1);
2162 log_error("Couldn't increase buffer.");
2171 iovec.iov_base = s->buffer;
2172 iovec.iov_len = s->buffer_size;
2176 msghdr.msg_iov = &iovec;
2177 msghdr.msg_iovlen = 1;
2178 msghdr.msg_control = &control;
2179 msghdr.msg_controllen = sizeof(control);
2181 n = recvmsg(ev->data.fd, &msghdr, MSG_DONTWAIT|MSG_CMSG_CLOEXEC);
2184 if (errno == EINTR || errno == EAGAIN)
2187 log_error("recvmsg() failed: %m");
2191 for (cmsg = CMSG_FIRSTHDR(&msghdr); cmsg; cmsg = CMSG_NXTHDR(&msghdr, cmsg)) {
2193 if (cmsg->cmsg_level == SOL_SOCKET &&
2194 cmsg->cmsg_type == SCM_CREDENTIALS &&
2195 cmsg->cmsg_len == CMSG_LEN(sizeof(struct ucred)))
2196 ucred = (struct ucred*) CMSG_DATA(cmsg);
2197 else if (cmsg->cmsg_level == SOL_SOCKET &&
2198 cmsg->cmsg_type == SCM_SECURITY) {
2199 label = (char*) CMSG_DATA(cmsg);
2200 label_len = cmsg->cmsg_len - CMSG_LEN(0);
2201 } else if (cmsg->cmsg_level == SOL_SOCKET &&
2202 cmsg->cmsg_type == SO_TIMESTAMP &&
2203 cmsg->cmsg_len == CMSG_LEN(sizeof(struct timeval)))
2204 tv = (struct timeval*) CMSG_DATA(cmsg);
2205 else if (cmsg->cmsg_level == SOL_SOCKET &&
2206 cmsg->cmsg_type == SCM_RIGHTS) {
2207 fds = (int*) CMSG_DATA(cmsg);
2208 n_fds = (cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int);
2212 if (ev->data.fd == s->syslog_fd) {
2215 if (n > 0 && n_fds == 0) {
2216 e = memchr(s->buffer, '\n', n);
2222 process_syslog_message(s, strstrip(s->buffer), ucred, tv, label, label_len);
2223 } else if (n_fds > 0)
2224 log_warning("Got file descriptors via syslog socket. Ignoring.");
2227 if (n > 0 && n_fds == 0)
2228 process_native_message(s, s->buffer, n, ucred, tv, label, label_len);
2229 else if (n == 0 && n_fds == 1)
2230 process_native_file(s, fds[0], ucred, tv, label, label_len);
2232 log_warning("Got too many file descriptors via native socket. Ignoring.");
2235 close_many(fds, n_fds);
2240 } else if (ev->data.fd == s->stdout_fd) {
2242 if (ev->events != EPOLLIN) {
2243 log_info("Got invalid event from epoll.");
2247 stdout_stream_new(s);
2251 StdoutStream *stream;
2253 if ((ev->events|EPOLLIN|EPOLLHUP) != (EPOLLIN|EPOLLHUP)) {
2254 log_info("Got invalid event from epoll.");
2258 /* If it is none of the well-known fds, it must be an
2259 * stdout stream fd. Note that this is a bit ugly here
2260 * (since we rely that none of the well-known fds
2261 * could be interpreted as pointer), but nonetheless
2262 * safe, since the well-known fds would never get an
2263 * fd > 4096, i.e. beyond the first memory page */
2265 stream = ev->data.ptr;
2267 if (stdout_stream_process(stream) <= 0)
2268 stdout_stream_free(stream);
2273 log_error("Unknown event.");
2277 static int open_syslog_socket(Server *s) {
2278 union sockaddr_union sa;
2280 struct epoll_event ev;
2284 if (s->syslog_fd < 0) {
2286 s->syslog_fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
2287 if (s->syslog_fd < 0) {
2288 log_error("socket() failed: %m");
2293 sa.un.sun_family = AF_UNIX;
2294 strncpy(sa.un.sun_path, "/dev/log", sizeof(sa.un.sun_path));
2296 unlink(sa.un.sun_path);
2298 r = bind(s->syslog_fd, &sa.sa, offsetof(union sockaddr_union, un.sun_path) + strlen(sa.un.sun_path));
2300 log_error("bind() failed: %m");
2304 chmod(sa.un.sun_path, 0666);
2306 fd_nonblock(s->syslog_fd, 1);
2309 r = setsockopt(s->syslog_fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one));
2311 log_error("SO_PASSCRED failed: %m");
2317 r = setsockopt(s->syslog_fd, SOL_SOCKET, SO_PASSSEC, &one, sizeof(one));
2319 log_warning("SO_PASSSEC failed: %m");
2323 r = setsockopt(s->syslog_fd, SOL_SOCKET, SO_TIMESTAMP, &one, sizeof(one));
2325 log_error("SO_TIMESTAMP failed: %m");
2330 ev.events = EPOLLIN;
2331 ev.data.fd = s->syslog_fd;
2332 if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->syslog_fd, &ev) < 0) {
2333 log_error("Failed to add syslog server fd to epoll object: %m");
2340 static int open_native_socket(Server*s) {
2341 union sockaddr_union sa;
2343 struct epoll_event ev;
2347 if (s->native_fd < 0) {
2349 s->native_fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
2350 if (s->native_fd < 0) {
2351 log_error("socket() failed: %m");
2356 sa.un.sun_family = AF_UNIX;
2357 strncpy(sa.un.sun_path, "/run/systemd/journal/socket", sizeof(sa.un.sun_path));
2359 unlink(sa.un.sun_path);
2361 r = bind(s->native_fd, &sa.sa, offsetof(union sockaddr_union, un.sun_path) + strlen(sa.un.sun_path));
2363 log_error("bind() failed: %m");
2367 chmod(sa.un.sun_path, 0666);
2369 fd_nonblock(s->native_fd, 1);
2372 r = setsockopt(s->native_fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one));
2374 log_error("SO_PASSCRED failed: %m");
2380 r = setsockopt(s->syslog_fd, SOL_SOCKET, SO_PASSSEC, &one, sizeof(one));
2382 log_warning("SO_PASSSEC failed: %m");
2386 r = setsockopt(s->native_fd, SOL_SOCKET, SO_TIMESTAMP, &one, sizeof(one));
2388 log_error("SO_TIMESTAMP failed: %m");
2393 ev.events = EPOLLIN;
2394 ev.data.fd = s->native_fd;
2395 if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->native_fd, &ev) < 0) {
2396 log_error("Failed to add native server fd to epoll object: %m");
2403 static int open_stdout_socket(Server *s) {
2404 union sockaddr_union sa;
2406 struct epoll_event ev;
2410 if (s->stdout_fd < 0) {
2412 s->stdout_fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
2413 if (s->stdout_fd < 0) {
2414 log_error("socket() failed: %m");
2419 sa.un.sun_family = AF_UNIX;
2420 strncpy(sa.un.sun_path, "/run/systemd/journal/stdout", sizeof(sa.un.sun_path));
2422 unlink(sa.un.sun_path);
2424 r = bind(s->stdout_fd, &sa.sa, offsetof(union sockaddr_union, un.sun_path) + strlen(sa.un.sun_path));
2426 log_error("bind() failed: %m");
2430 chmod(sa.un.sun_path, 0666);
2432 if (listen(s->stdout_fd, SOMAXCONN) < 0) {
2433 log_error("liste() failed: %m");
2437 fd_nonblock(s->stdout_fd, 1);
2440 ev.events = EPOLLIN;
2441 ev.data.fd = s->stdout_fd;
2442 if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->stdout_fd, &ev) < 0) {
2443 log_error("Failed to add stdout server fd to epoll object: %m");
2450 static int open_proc_kmsg(Server *s) {
2451 struct epoll_event ev;
2455 if (!s->import_proc_kmsg)
2459 s->proc_kmsg_fd = open("/proc/kmsg", O_CLOEXEC|O_NONBLOCK|O_NOCTTY);
2460 if (s->proc_kmsg_fd < 0) {
2461 log_warning("Failed to open /proc/kmsg, ignoring: %m");
2466 ev.events = EPOLLIN;
2467 ev.data.fd = s->proc_kmsg_fd;
2468 if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->proc_kmsg_fd, &ev) < 0) {
2469 log_error("Failed to add /proc/kmsg fd to epoll object: %m");
2476 static int open_signalfd(Server *s) {
2478 struct epoll_event ev;
2482 assert_se(sigemptyset(&mask) == 0);
2483 sigset_add_many(&mask, SIGINT, SIGTERM, SIGUSR1, -1);
2484 assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
2486 s->signal_fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC);
2487 if (s->signal_fd < 0) {
2488 log_error("signalfd(): %m");
2493 ev.events = EPOLLIN;
2494 ev.data.fd = s->signal_fd;
2496 if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->signal_fd, &ev) < 0) {
2497 log_error("epoll_ctl(): %m");
2504 static int server_parse_proc_cmdline(Server *s) {
2505 char *line, *w, *state;
2509 if (detect_container(NULL) > 0)
2512 r = read_one_line_file("/proc/cmdline", &line);
2514 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
2518 FOREACH_WORD_QUOTED(w, l, line, state) {
2521 word = strndup(w, l);
2527 if (startswith(word, "systemd_journald.forward_to_syslog=")) {
2528 r = parse_boolean(word + 35);
2530 log_warning("Failed to parse forward to syslog switch %s. Ignoring.", word + 35);
2532 s->forward_to_syslog = r;
2533 } else if (startswith(word, "systemd_journald.forward_to_kmsg=")) {
2534 r = parse_boolean(word + 33);
2536 log_warning("Failed to parse forward to kmsg switch %s. Ignoring.", word + 33);
2538 s->forward_to_kmsg = r;
2539 } else if (startswith(word, "systemd_journald.forward_to_console=")) {
2540 r = parse_boolean(word + 36);
2542 log_warning("Failed to parse forward to console switch %s. Ignoring.", word + 36);
2544 s->forward_to_console = r;
2557 static int server_parse_config_file(Server *s) {
2564 fn = "/etc/systemd/systemd-journald.conf";
2565 f = fopen(fn, "re");
2567 if (errno == ENOENT)
2570 log_warning("Failed to open configuration file %s: %m", fn);
2574 r = config_parse(fn, f, "Journal\0", config_item_perf_lookup, (void*) journald_gperf_lookup, false, s);
2576 log_warning("Failed to parse configuration file: %s", strerror(-r));
2583 static int server_init(Server *s) {
2589 s->syslog_fd = s->native_fd = s->stdout_fd = s->signal_fd = s->epoll_fd = s->proc_kmsg_fd = -1;
2592 s->rate_limit_interval = DEFAULT_RATE_LIMIT_INTERVAL;
2593 s->rate_limit_burst = DEFAULT_RATE_LIMIT_BURST;
2595 s->forward_to_syslog = true;
2596 s->import_proc_kmsg = true;
2598 memset(&s->system_metrics, 0xFF, sizeof(s->system_metrics));
2599 memset(&s->runtime_metrics, 0xFF, sizeof(s->runtime_metrics));
2601 server_parse_config_file(s);
2602 server_parse_proc_cmdline(s);
2604 s->user_journals = hashmap_new(trivial_hash_func, trivial_compare_func);
2605 if (!s->user_journals) {
2606 log_error("Out of memory.");
2610 s->epoll_fd = epoll_create1(EPOLL_CLOEXEC);
2611 if (s->epoll_fd < 0) {
2612 log_error("Failed to create epoll object: %m");
2616 n = sd_listen_fds(true);
2618 log_error("Failed to read listening file descriptors from environment: %s", strerror(-n));
2622 for (fd = SD_LISTEN_FDS_START; fd < SD_LISTEN_FDS_START + n; fd++) {
2624 if (sd_is_socket_unix(fd, SOCK_DGRAM, -1, "/run/systemd/journal/socket", 0) > 0) {
2626 if (s->native_fd >= 0) {
2627 log_error("Too many native sockets passed.");
2633 } else if (sd_is_socket_unix(fd, SOCK_STREAM, 1, "/run/systemd/journal/stdout", 0) > 0) {
2635 if (s->stdout_fd >= 0) {
2636 log_error("Too many stdout sockets passed.");
2642 } else if (sd_is_socket_unix(fd, SOCK_DGRAM, -1, "/dev/log", 0) > 0) {
2644 if (s->syslog_fd >= 0) {
2645 log_error("Too many /dev/log sockets passed.");
2652 log_error("Unknown socket passed.");
2657 r = open_syslog_socket(s);
2661 r = open_native_socket(s);
2665 r = open_stdout_socket(s);
2669 r = open_proc_kmsg(s);
2673 r = open_signalfd(s);
2677 s->rate_limit = journal_rate_limit_new(s->rate_limit_interval, s->rate_limit_burst);
2681 r = system_journal_open(s);
2688 static void server_done(Server *s) {
2692 while (s->stdout_streams)
2693 stdout_stream_free(s->stdout_streams);
2695 if (s->system_journal)
2696 journal_file_close(s->system_journal);
2698 if (s->runtime_journal)
2699 journal_file_close(s->runtime_journal);
2701 while ((f = hashmap_steal_first(s->user_journals)))
2702 journal_file_close(f);
2704 hashmap_free(s->user_journals);
2706 if (s->epoll_fd >= 0)
2707 close_nointr_nofail(s->epoll_fd);
2709 if (s->signal_fd >= 0)
2710 close_nointr_nofail(s->signal_fd);
2712 if (s->syslog_fd >= 0)
2713 close_nointr_nofail(s->syslog_fd);
2715 if (s->native_fd >= 0)
2716 close_nointr_nofail(s->native_fd);
2718 if (s->stdout_fd >= 0)
2719 close_nointr_nofail(s->stdout_fd);
2721 if (s->proc_kmsg_fd >= 0)
2722 close_nointr_nofail(s->proc_kmsg_fd);
2725 journal_rate_limit_free(s->rate_limit);
2730 int main(int argc, char *argv[]) {
2734 /* if (getppid() != 1) { */
2735 /* log_error("This program should be invoked by init only."); */
2736 /* return EXIT_FAILURE; */
2740 log_error("This program does not take arguments.");
2741 return EXIT_FAILURE;
2744 log_set_target(LOG_TARGET_CONSOLE);
2745 log_parse_environment();
2750 r = server_init(&server);
2754 server_vacuum(&server);
2755 server_flush_to_var(&server);
2756 server_flush_proc_kmsg(&server);
2758 log_debug("systemd-journald running as pid %lu", (unsigned long) getpid());
2759 driver_message(&server, SD_MESSAGE_JOURNAL_START, "Journal started");
2763 "STATUS=Processing requests...");
2766 struct epoll_event event;
2768 r = epoll_wait(server.epoll_fd, &event, 1, -1);
2774 log_error("epoll_wait() failed: %m");
2780 r = process_event(&server, &event);
2787 log_debug("systemd-journald stopped as pid %lu", (unsigned long) getpid());
2788 driver_message(&server, SD_MESSAGE_JOURNAL_STOP, "Journal stopped");
2792 "STATUS=Shutting down...");
2794 server_done(&server);
2796 return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;