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
;
48 static void fix_perms(JournalFile
*f
, uid_t uid
) {
51 acl_permset_t permset
;
56 r
= fchmod_and_fchown(f
->fd
, 0640, 0, 0);
58 log_warning("Failed to fix access mode/rights on %s, ignoring: %s", f
->path
, strerror(-r
));
63 acl
= acl_get_fd(f
->fd
);
65 log_warning("Failed to read ACL on %s, ignoring: %m", f
->path
);
69 r
= acl_find_uid(acl
, uid
, &entry
);
72 if (acl_create_entry(&acl
, &entry
) < 0 ||
73 acl_set_tag_type(entry
, ACL_USER
) < 0 ||
74 acl_set_qualifier(entry
, &uid
) < 0) {
75 log_warning("Failed to patch ACL on %s, ignoring: %m", f
->path
);
80 if (acl_get_permset(entry
, &permset
) < 0 ||
81 acl_add_perm(permset
, ACL_READ
) < 0 ||
82 acl_calc_mask(&acl
) < 0) {
83 log_warning("Failed to patch ACL on %s, ignoring: %m", f
->path
);
87 if (acl_set_fd(f
->fd
, acl
) < 0)
88 log_warning("Failed to set ACL on %s, ignoring: %m", f
->path
);
94 static JournalFile
* find_journal(Server
*s
, uid_t uid
) {
101 /* We split up user logs only on /var, not on /run */
102 if (!s
->system_journal
)
103 return s
->runtime_journal
;
106 return s
->system_journal
;
108 f
= hashmap_get(s
->user_journals
, UINT32_TO_PTR(uid
));
112 if (asprintf(&p
, "/var/log/journal/user-%lu.journal", (unsigned long) uid
) < 0)
113 return s
->system_journal
;
115 r
= journal_file_open(p
, O_RDWR
|O_CREAT
, 0640, NULL
, &f
);
119 return s
->system_journal
;
123 r
= hashmap_put(s
->user_journals
, UINT32_TO_PTR(uid
), f
);
125 journal_file_close(f
);
126 return s
->system_journal
;
132 static void process_message(Server
*s
, const char *buf
, struct ucred
*ucred
, struct timeval
*tv
) {
133 char *message
= NULL
, *pid
= NULL
, *uid
= NULL
, *gid
= NULL
,
134 *source_time
= NULL
, *boot_id
= NULL
, *machine_id
= NULL
,
135 *comm
= NULL
, *cmdline
= NULL
, *hostname
= NULL
,
136 *audit_session
= NULL
, *audit_loginuid
= NULL
,
137 *syslog_priority
= NULL
, *syslog_facility
= NULL
,
138 *exe
= NULL
, *cgroup
= NULL
;
139 struct iovec iovec
[16];
145 int priority
= LOG_USER
| LOG_INFO
;
149 parse_syslog_priority((char**) &buf
, &priority
);
150 skip_syslog_date((char**) &buf
);
152 if (asprintf(&syslog_priority
, "PRIORITY=%i", priority
& LOG_PRIMASK
) >= 0)
153 IOVEC_SET_STRING(iovec
[n
++], syslog_priority
);
155 if (asprintf(&syslog_facility
, "SYSLOG_FACILITY=%i", LOG_FAC(priority
)) >= 0)
156 IOVEC_SET_STRING(iovec
[n
++], syslog_facility
);
158 message
= strappend("MESSAGE=", buf
);
160 IOVEC_SET_STRING(iovec
[n
++], message
);
166 if (asprintf(&pid
, "PID=%lu", (unsigned long) ucred
->pid
) >= 0)
167 IOVEC_SET_STRING(iovec
[n
++], pid
);
169 if (asprintf(&uid
, "UID=%lu", (unsigned long) ucred
->uid
) >= 0)
170 IOVEC_SET_STRING(iovec
[n
++], uid
);
172 if (asprintf(&gid
, "GID=%lu", (unsigned long) ucred
->gid
) >= 0)
173 IOVEC_SET_STRING(iovec
[n
++], gid
);
175 r
= get_process_comm(ucred
->pid
, &t
);
177 comm
= strappend("COMM=", t
);
179 IOVEC_SET_STRING(iovec
[n
++], comm
);
183 r
= get_process_exe(ucred
->pid
, &t
);
185 exe
= strappend("EXE=", t
);
187 IOVEC_SET_STRING(iovec
[n
++], exe
);
191 r
= get_process_cmdline(ucred
->pid
, LINE_MAX
, false, &t
);
193 cmdline
= strappend("CMDLINE=", t
);
195 IOVEC_SET_STRING(iovec
[n
++], cmdline
);
199 r
= audit_session_from_pid(ucred
->pid
, &session
);
201 if (asprintf(&audit_session
, "AUDIT_SESSION=%lu", (unsigned long) session
) >= 0)
202 IOVEC_SET_STRING(iovec
[n
++], audit_session
);
204 r
= audit_loginuid_from_pid(ucred
->pid
, &loginuid
);
206 if (asprintf(&audit_loginuid
, "AUDIT_LOGINUID=%lu", (unsigned long) loginuid
) >= 0)
207 IOVEC_SET_STRING(iovec
[n
++], audit_loginuid
);
209 r
= cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER
, ucred
->pid
, &path
);
211 cgroup
= strappend("SYSTEMD_CGROUP=", path
);
213 IOVEC_SET_STRING(iovec
[n
++], cgroup
);
219 if (asprintf(&source_time
, "SOURCE_REALTIME_TIMESTAMP=%llu",
220 (unsigned long long) timeval_load(tv
)) >= 0)
221 IOVEC_SET_STRING(iovec
[n
++], source_time
);
224 /* Note that strictly speaking storing the boot id here is
225 * redundant since the entry includes this in-line
226 * anyway. However, we need this indexed, too. */
227 r
= sd_id128_get_boot(&id
);
229 if (asprintf(&boot_id
, "BOOT_ID=%s", sd_id128_to_string(id
, idbuf
)) >= 0)
230 IOVEC_SET_STRING(iovec
[n
++], boot_id
);
232 r
= sd_id128_get_machine(&id
);
234 if (asprintf(&machine_id
, "MACHINE_ID=%s", sd_id128_to_string(id
, idbuf
)) >= 0)
235 IOVEC_SET_STRING(iovec
[n
++], machine_id
);
237 t
= gethostname_malloc();
239 hostname
= strappend("HOSTNAME=", t
);
241 IOVEC_SET_STRING(iovec
[n
++], hostname
);
245 f
= find_journal(s
, loginuid
);
247 log_warning("Dropping message, as we can't find a place to store the data.");
249 r
= journal_file_append_entry(f
, NULL
, iovec
, n
, NULL
, NULL
);
252 log_error("Failed to write entry, ignoring: %s", strerror(-r
));
267 free(audit_loginuid
);
268 free(syslog_facility
);
269 free(syslog_priority
);
273 static int process_event(Server
*s
, struct epoll_event
*ev
) {
276 if (ev
->events
!= EPOLLIN
) {
277 log_info("Got invalid event from epoll.");
281 if (ev
->data
.fd
== s
->signal_fd
) {
282 struct signalfd_siginfo sfsi
;
285 n
= read(s
->signal_fd
, &sfsi
, sizeof(sfsi
));
286 if (n
!= sizeof(sfsi
)) {
291 if (errno
== EINTR
|| errno
== EAGAIN
)
297 log_debug("Received SIG%s", signal_to_string(sfsi
.ssi_signo
));
302 if (ev
->data
.fd
== s
->syslog_fd
) {
304 char buf
[LINE_MAX
+1];
305 struct msghdr msghdr
;
307 struct ucred
*ucred
= NULL
;
308 struct timeval
*tv
= NULL
;
309 struct cmsghdr
*cmsg
;
311 struct cmsghdr cmsghdr
;
312 uint8_t buf
[CMSG_SPACE(sizeof(struct ucred
)) +
313 CMSG_SPACE(sizeof(struct timeval
))];
319 iovec
.iov_base
= buf
;
320 iovec
.iov_len
= sizeof(buf
)-1;
324 msghdr
.msg_iov
= &iovec
;
325 msghdr
.msg_iovlen
= 1;
326 msghdr
.msg_control
= &control
;
327 msghdr
.msg_controllen
= sizeof(control
);
329 n
= recvmsg(ev
->data
.fd
, &msghdr
, MSG_DONTWAIT
);
332 if (errno
== EINTR
|| errno
== EAGAIN
)
335 log_error("recvmsg() failed: %m");
339 for (cmsg
= CMSG_FIRSTHDR(&msghdr
); cmsg
; cmsg
= CMSG_NXTHDR(&msghdr
, cmsg
)) {
341 if (cmsg
->cmsg_level
== SOL_SOCKET
&&
342 cmsg
->cmsg_type
== SCM_CREDENTIALS
&&
343 cmsg
->cmsg_len
== CMSG_LEN(sizeof(struct ucred
)))
344 ucred
= (struct ucred
*) CMSG_DATA(cmsg
);
345 else if (cmsg
->cmsg_level
== SOL_SOCKET
&&
346 cmsg
->cmsg_type
== SO_TIMESTAMP
&&
347 cmsg
->cmsg_len
== CMSG_LEN(sizeof(struct timeval
)))
348 tv
= (struct timeval
*) CMSG_DATA(cmsg
);
351 e
= memchr(buf
, '\n', n
);
357 process_message(s
, strstrip(buf
), ucred
, tv
);
363 log_error("Unknown event.");
367 static int system_journal_open(Server
*s
) {
373 r
= sd_id128_get_machine(&machine
);
377 /* First try to create the machine path, but not the prefix */
378 fn
= strappend("/var/log/journal/", sd_id128_to_string(machine
, ids
));
381 (void) mkdir(fn
, 0755);
384 /* The create the system journal file */
385 fn
= join("/var/log/journal/", ids
, "/system.journal", NULL
);
389 r
= journal_file_open(fn
, O_RDWR
|O_CREAT
, 0640, NULL
, &s
->system_journal
);
393 fix_perms(s
->system_journal
, 0);
397 if (r
< 0 && r
!= -ENOENT
) {
398 log_error("Failed to open system journal: %s", strerror(-r
));
402 /* /var didn't work, so try /run, but this time we
403 * create the prefix too */
404 fn
= strappend("/run/log/journal/", ids
);
407 (void) mkdir_p(fn
, 0755);
410 /* Then create the runtime journal file */
411 fn
= join("/run/log/journal/", ids
, "/system.journal", NULL
);
414 r
= journal_file_open(fn
, O_RDWR
|O_CREAT
, 0640, NULL
, &s
->runtime_journal
);
418 log_error("Failed to open runtime journal: %s", strerror(-r
));
422 fix_perms(s
->runtime_journal
, 0);
426 static int server_init(Server
*s
) {
428 struct epoll_event ev
;
434 s
->syslog_fd
= s
->signal_fd
= -1;
436 s
->epoll_fd
= epoll_create1(EPOLL_CLOEXEC
);
437 if (s
->epoll_fd
< 0) {
438 log_error("Failed to create epoll object: %m");
442 n
= sd_listen_fds(true);
444 log_error("Failed to read listening file descriptors from environment: %s", strerror(-n
));
449 log_error("Too many file descriptors passed.");
454 s
->syslog_fd
= SD_LISTEN_FDS_START
;
456 union sockaddr_union sa
;
458 s
->syslog_fd
= socket(AF_UNIX
, SOCK_DGRAM
|SOCK_CLOEXEC
, 0);
459 if (s
->syslog_fd
< 0) {
460 log_error("socket() failed: %m");
465 sa
.un
.sun_family
= AF_UNIX
;
466 strncpy(sa
.un
.sun_path
, "/run/systemd/syslog", sizeof(sa
.un
.sun_path
));
468 unlink(sa
.un
.sun_path
);
470 r
= bind(s
->syslog_fd
, &sa
.sa
, sizeof(sa
.un
));
472 log_error("bind() failed: %m");
476 chmod(sa
.un
.sun_path
, 0666);
480 r
= setsockopt(s
->syslog_fd
, SOL_SOCKET
, SO_PASSCRED
, &one
, sizeof(one
));
482 log_error("SO_PASSCRED failed: %m");
487 r
= setsockopt(s
->syslog_fd
, SOL_SOCKET
, SO_TIMESTAMP
, &one
, sizeof(one
));
489 log_error("SO_TIMESTAMP failed: %m");
495 ev
.data
.fd
= s
->syslog_fd
;
496 if (epoll_ctl(s
->epoll_fd
, EPOLL_CTL_ADD
, s
->syslog_fd
, &ev
) < 0) {
497 log_error("Failed to add server fd to epoll object: %m");
501 s
->user_journals
= hashmap_new(trivial_hash_func
, trivial_compare_func
);
502 if (!s
->user_journals
) {
503 log_error("Out of memory.");
507 r
= system_journal_open(s
);
511 assert_se(sigemptyset(&mask
) == 0);
512 sigset_add_many(&mask
, SIGINT
, SIGTERM
, -1);
513 assert_se(sigprocmask(SIG_SETMASK
, &mask
, NULL
) == 0);
515 s
->signal_fd
= signalfd(-1, &mask
, SFD_NONBLOCK
|SFD_CLOEXEC
);
516 if (s
->signal_fd
< 0) {
517 log_error("signalfd(): %m");
523 ev
.data
.fd
= s
->signal_fd
;
525 if (epoll_ctl(s
->epoll_fd
, EPOLL_CTL_ADD
, s
->signal_fd
, &ev
) < 0) {
526 log_error("epoll_ctl(): %m");
533 static void server_done(Server
*s
) {
537 if (s
->system_journal
)
538 journal_file_close(s
->system_journal
);
540 if (s
->runtime_journal
)
541 journal_file_close(s
->runtime_journal
);
543 while ((f
= hashmap_steal_first(s
->user_journals
)))
544 journal_file_close(f
);
546 hashmap_free(s
->user_journals
);
548 if (s
->epoll_fd
>= 0)
549 close_nointr_nofail(s
->epoll_fd
);
551 if (s
->signal_fd
>= 0)
552 close_nointr_nofail(s
->signal_fd
);
554 if (s
->syslog_fd
>= 0)
555 close_nointr_nofail(s
->syslog_fd
);
558 int main(int argc
, char *argv
[]) {
562 /* if (getppid() != 1) { */
563 /* log_error("This program should be invoked by init only."); */
564 /* return EXIT_FAILURE; */
568 log_error("This program does not take arguments.");
572 log_set_target(LOG_TARGET_CONSOLE
);
573 log_parse_environment();
578 r
= server_init(&server
);
582 log_debug("systemd-journald running as pid %lu", (unsigned long) getpid());
586 "STATUS=Processing messages...");
589 struct epoll_event event
;
591 r
= epoll_wait(server
.epoll_fd
, &event
, 1, -1);
597 log_error("epoll_wait() failed: %m");
603 r
= process_event(&server
, &event
);
612 "STATUS=Shutting down...");
614 server_done(&server
);
616 return r
< 0 ? EXIT_FAILURE
: EXIT_SUCCESS
;