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 <acl/libacl.h>
32 #include "journal-file.h"
33 #include "sd-daemon.h"
34 #include "socket-util.h"
36 #include "cgroup-util.h"
38 typedef struct Server {
43 JournalFile *runtime_journal;
44 JournalFile *system_journal;
45 Hashmap *user_journals;
50 static void fix_perms(JournalFile *f, uid_t uid) {
53 acl_permset_t permset;
58 r = fchmod_and_fchown(f->fd, 0640, 0, 0);
60 log_warning("Failed to fix access mode/rights on %s, ignoring: %s", f->path, strerror(-r));
65 acl = acl_get_fd(f->fd);
67 log_warning("Failed to read ACL on %s, ignoring: %m", f->path);
71 r = acl_find_uid(acl, uid, &entry);
74 if (acl_create_entry(&acl, &entry) < 0 ||
75 acl_set_tag_type(entry, ACL_USER) < 0 ||
76 acl_set_qualifier(entry, &uid) < 0) {
77 log_warning("Failed to patch ACL on %s, ignoring: %m", f->path);
82 if (acl_get_permset(entry, &permset) < 0 ||
83 acl_add_perm(permset, ACL_READ) < 0 ||
84 acl_calc_mask(&acl) < 0) {
85 log_warning("Failed to patch ACL on %s, ignoring: %m", f->path);
89 if (acl_set_fd(f->fd, acl) < 0)
90 log_warning("Failed to set ACL on %s, ignoring: %m", f->path);
96 static JournalFile* find_journal(Server *s, uid_t uid) {
105 /* We split up user logs only on /var, not on /run */
106 if (!s->system_journal)
107 return s->runtime_journal;
110 return s->system_journal;
112 r = sd_id128_get_machine(&machine);
114 return s->system_journal;
116 f = hashmap_get(s->user_journals, UINT32_TO_PTR(uid));
120 if (asprintf(&p, "/var/log/journal/%s/user-%lu.journal", sd_id128_to_string(machine, ids), (unsigned long) uid) < 0)
121 return s->system_journal;
123 r = journal_file_open(p, O_RDWR|O_CREAT, 0640, s->system_journal, &f);
127 return s->system_journal;
131 r = hashmap_put(s->user_journals, UINT32_TO_PTR(uid), f);
133 journal_file_close(f);
134 return s->system_journal;
140 static void process_message(Server *s, const char *buf, struct ucred *ucred, struct timeval *tv) {
141 char *message = NULL, *pid = NULL, *uid = NULL, *gid = NULL,
142 *source_time = NULL, *boot_id = NULL, *machine_id = NULL,
143 *comm = NULL, *cmdline = NULL, *hostname = NULL,
144 *audit_session = NULL, *audit_loginuid = NULL,
145 *syslog_priority = NULL, *syslog_facility = NULL,
146 *exe = NULL, *cgroup = NULL;
147 struct iovec iovec[17];
153 int priority = LOG_USER | LOG_INFO;
154 uid_t loginuid = 0, realuid = 0;
157 parse_syslog_priority((char**) &buf, &priority);
158 skip_syslog_date((char**) &buf);
160 if (asprintf(&syslog_priority, "PRIORITY=%i", priority & LOG_PRIMASK) >= 0)
161 IOVEC_SET_STRING(iovec[n++], syslog_priority);
163 if (asprintf(&syslog_facility, "SYSLOG_FACILITY=%i", LOG_FAC(priority)) >= 0)
164 IOVEC_SET_STRING(iovec[n++], syslog_facility);
166 message = strappend("MESSAGE=", buf);
168 IOVEC_SET_STRING(iovec[n++], message);
174 realuid = ucred->uid;
176 if (asprintf(&pid, "_PID=%lu", (unsigned long) ucred->pid) >= 0)
177 IOVEC_SET_STRING(iovec[n++], pid);
179 if (asprintf(&uid, "_UID=%lu", (unsigned long) ucred->uid) >= 0)
180 IOVEC_SET_STRING(iovec[n++], uid);
182 if (asprintf(&gid, "_GID=%lu", (unsigned long) ucred->gid) >= 0)
183 IOVEC_SET_STRING(iovec[n++], gid);
185 r = get_process_comm(ucred->pid, &t);
187 comm = strappend("_COMM=", t);
189 IOVEC_SET_STRING(iovec[n++], comm);
193 r = get_process_exe(ucred->pid, &t);
195 exe = strappend("_EXE=", t);
197 IOVEC_SET_STRING(iovec[n++], exe);
201 r = get_process_cmdline(ucred->pid, LINE_MAX, false, &t);
203 cmdline = strappend("_CMDLINE=", t);
205 IOVEC_SET_STRING(iovec[n++], cmdline);
209 r = audit_session_from_pid(ucred->pid, &session);
211 if (asprintf(&audit_session, "_AUDIT_SESSION=%lu", (unsigned long) session) >= 0)
212 IOVEC_SET_STRING(iovec[n++], audit_session);
214 r = audit_loginuid_from_pid(ucred->pid, &loginuid);
216 if (asprintf(&audit_loginuid, "_AUDIT_LOGINUID=%lu", (unsigned long) loginuid) >= 0)
217 IOVEC_SET_STRING(iovec[n++], audit_loginuid);
219 r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, ucred->pid, &path);
221 cgroup = strappend("_SYSTEMD_CGROUP=", path);
223 IOVEC_SET_STRING(iovec[n++], cgroup);
229 if (asprintf(&source_time, "_SOURCE_REALTIME_TIMESTAMP=%llu",
230 (unsigned long long) timeval_load(tv)) >= 0)
231 IOVEC_SET_STRING(iovec[n++], source_time);
234 /* Note that strictly speaking storing the boot id here is
235 * redundant since the entry includes this in-line
236 * anyway. However, we need this indexed, too. */
237 r = sd_id128_get_boot(&id);
239 if (asprintf(&boot_id, "_BOOT_ID=%s", sd_id128_to_string(id, idbuf)) >= 0)
240 IOVEC_SET_STRING(iovec[n++], boot_id);
242 r = sd_id128_get_machine(&id);
244 if (asprintf(&machine_id, "_MACHINE_ID=%s", sd_id128_to_string(id, idbuf)) >= 0)
245 IOVEC_SET_STRING(iovec[n++], machine_id);
247 t = gethostname_malloc();
249 hostname = strappend("_HOSTNAME=", t);
251 IOVEC_SET_STRING(iovec[n++], hostname);
255 f = find_journal(s, realuid == 0 ? 0 : loginuid);
257 log_warning("Dropping message, as we can't find a place to store the data.");
259 r = journal_file_append_entry(f, NULL, iovec, n, &s->seqnum, NULL, NULL);
262 log_error("Failed to write entry, ignoring: %s", strerror(-r));
277 free(audit_loginuid);
278 free(syslog_facility);
279 free(syslog_priority);
283 static int process_event(Server *s, struct epoll_event *ev) {
286 if (ev->events != EPOLLIN) {
287 log_info("Got invalid event from epoll.");
291 if (ev->data.fd == s->signal_fd) {
292 struct signalfd_siginfo sfsi;
295 n = read(s->signal_fd, &sfsi, sizeof(sfsi));
296 if (n != sizeof(sfsi)) {
301 if (errno == EINTR || errno == EAGAIN)
307 log_debug("Received SIG%s", signal_to_string(sfsi.ssi_signo));
312 if (ev->data.fd == s->syslog_fd) {
314 char buf[LINE_MAX+1];
315 struct msghdr msghdr;
317 struct ucred *ucred = NULL;
318 struct timeval *tv = NULL;
319 struct cmsghdr *cmsg;
321 struct cmsghdr cmsghdr;
322 uint8_t buf[CMSG_SPACE(sizeof(struct ucred)) +
323 CMSG_SPACE(sizeof(struct timeval))];
329 iovec.iov_base = buf;
330 iovec.iov_len = sizeof(buf)-1;
334 msghdr.msg_iov = &iovec;
335 msghdr.msg_iovlen = 1;
336 msghdr.msg_control = &control;
337 msghdr.msg_controllen = sizeof(control);
339 n = recvmsg(ev->data.fd, &msghdr, MSG_DONTWAIT);
342 if (errno == EINTR || errno == EAGAIN)
345 log_error("recvmsg() failed: %m");
349 for (cmsg = CMSG_FIRSTHDR(&msghdr); cmsg; cmsg = CMSG_NXTHDR(&msghdr, cmsg)) {
351 if (cmsg->cmsg_level == SOL_SOCKET &&
352 cmsg->cmsg_type == SCM_CREDENTIALS &&
353 cmsg->cmsg_len == CMSG_LEN(sizeof(struct ucred)))
354 ucred = (struct ucred*) CMSG_DATA(cmsg);
355 else if (cmsg->cmsg_level == SOL_SOCKET &&
356 cmsg->cmsg_type == SO_TIMESTAMP &&
357 cmsg->cmsg_len == CMSG_LEN(sizeof(struct timeval)))
358 tv = (struct timeval*) CMSG_DATA(cmsg);
361 e = memchr(buf, '\n', n);
367 process_message(s, strstrip(buf), ucred, tv);
373 log_error("Unknown event.");
377 static int system_journal_open(Server *s) {
383 r = sd_id128_get_machine(&machine);
387 /* First try to create the machine path, but not the prefix */
388 fn = strappend("/var/log/journal/", sd_id128_to_string(machine, ids));
391 (void) mkdir(fn, 0755);
394 /* The create the system journal file */
395 fn = join("/var/log/journal/", ids, "/system.journal", NULL);
399 r = journal_file_open(fn, O_RDWR|O_CREAT, 0640, NULL, &s->system_journal);
403 fix_perms(s->system_journal, 0);
407 if (r < 0 && r != -ENOENT) {
408 log_error("Failed to open system journal: %s", strerror(-r));
412 /* /var didn't work, so try /run, but this time we
413 * create the prefix too */
414 fn = join("/run/log/journal/", ids, "/system.journal", NULL);
418 (void) mkdir_parents(fn, 0755);
419 r = journal_file_open(fn, O_RDWR|O_CREAT, 0640, NULL, &s->runtime_journal);
423 log_error("Failed to open runtime journal: %s", strerror(-r));
427 fix_perms(s->runtime_journal, 0);
431 static int server_init(Server *s) {
433 struct epoll_event ev;
439 s->syslog_fd = s->signal_fd = -1;
441 s->epoll_fd = epoll_create1(EPOLL_CLOEXEC);
442 if (s->epoll_fd < 0) {
443 log_error("Failed to create epoll object: %m");
447 n = sd_listen_fds(true);
449 log_error("Failed to read listening file descriptors from environment: %s", strerror(-n));
454 log_error("Too many file descriptors passed.");
459 s->syslog_fd = SD_LISTEN_FDS_START;
461 union sockaddr_union sa;
463 s->syslog_fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0);
464 if (s->syslog_fd < 0) {
465 log_error("socket() failed: %m");
470 sa.un.sun_family = AF_UNIX;
471 strncpy(sa.un.sun_path, "/run/systemd/syslog", sizeof(sa.un.sun_path));
473 unlink(sa.un.sun_path);
475 r = bind(s->syslog_fd, &sa.sa, sizeof(sa.un));
477 log_error("bind() failed: %m");
481 chmod(sa.un.sun_path, 0666);
485 r = setsockopt(s->syslog_fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one));
487 log_error("SO_PASSCRED failed: %m");
492 r = setsockopt(s->syslog_fd, SOL_SOCKET, SO_TIMESTAMP, &one, sizeof(one));
494 log_error("SO_TIMESTAMP failed: %m");
500 ev.data.fd = s->syslog_fd;
501 if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->syslog_fd, &ev) < 0) {
502 log_error("Failed to add server fd to epoll object: %m");
506 s->user_journals = hashmap_new(trivial_hash_func, trivial_compare_func);
507 if (!s->user_journals) {
508 log_error("Out of memory.");
512 r = system_journal_open(s);
516 assert_se(sigemptyset(&mask) == 0);
517 sigset_add_many(&mask, SIGINT, SIGTERM, -1);
518 assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
520 s->signal_fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC);
521 if (s->signal_fd < 0) {
522 log_error("signalfd(): %m");
528 ev.data.fd = s->signal_fd;
530 if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->signal_fd, &ev) < 0) {
531 log_error("epoll_ctl(): %m");
538 static void server_done(Server *s) {
542 if (s->system_journal)
543 journal_file_close(s->system_journal);
545 if (s->runtime_journal)
546 journal_file_close(s->runtime_journal);
548 while ((f = hashmap_steal_first(s->user_journals)))
549 journal_file_close(f);
551 hashmap_free(s->user_journals);
553 if (s->epoll_fd >= 0)
554 close_nointr_nofail(s->epoll_fd);
556 if (s->signal_fd >= 0)
557 close_nointr_nofail(s->signal_fd);
559 if (s->syslog_fd >= 0)
560 close_nointr_nofail(s->syslog_fd);
563 int main(int argc, char *argv[]) {
567 /* if (getppid() != 1) { */
568 /* log_error("This program should be invoked by init only."); */
569 /* return EXIT_FAILURE; */
573 log_error("This program does not take arguments.");
577 log_set_target(LOG_TARGET_CONSOLE);
578 log_parse_environment();
583 r = server_init(&server);
587 log_debug("systemd-journald running as pid %lu", (unsigned long) getpid());
591 "STATUS=Processing messages...");
594 struct epoll_event event;
596 r = epoll_wait(server.epoll_fd, &event, 1, -1);
602 log_error("epoll_wait() failed: %m");
608 r = process_event(&server, &event);
617 "STATUS=Shutting down...");
619 server_done(&server);
621 return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;