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git.ipfire.org Git - thirdparty/systemd.git/blob - src/journal/journald.c
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>
30 #include "journal-private.h"
31 #include "sd-daemon.h"
32 #include "socket-util.h"
34 typedef struct Server
{
39 JournalFile
*system_journal
;
40 Hashmap
*user_journals
;
43 static void process_message(Server
*s
, const char *buf
, struct ucred
*ucred
, struct timeval
*tv
) {
44 char *message
= NULL
, *pid
= NULL
, *uid
= NULL
, *gid
= NULL
,
45 *source_time
= NULL
, *boot_id
= NULL
, *machine_id
= NULL
,
46 *comm
= NULL
, *cmdline
= NULL
, *hostname
= NULL
,
47 *audit_session
= NULL
, *audit_loginuid
= NULL
,
48 *syslog_priority
= NULL
, *syslog_facility
= NULL
,
51 struct iovec iovec
[15];
57 int priority
= LOG_USER
| LOG_INFO
;
59 dual_timestamp_get(&ts
);
61 parse_syslog_priority((char**) &buf
, &priority
);
62 skip_syslog_date((char**) &buf
);
64 if (asprintf(&syslog_priority
, "PRIORITY=%i", priority
& LOG_PRIMASK
) >= 0)
65 IOVEC_SET_STRING(iovec
[n
++], syslog_priority
);
67 if (asprintf(&syslog_facility
, "SYSLOG_FACILITY=%i", LOG_FAC(priority
)) >= 0)
68 IOVEC_SET_STRING(iovec
[n
++], syslog_facility
);
70 message
= strappend("MESSAGE=", buf
);
72 IOVEC_SET_STRING(iovec
[n
++], message
);
78 if (asprintf(&pid
, "PID=%lu", (unsigned long) ucred
->pid
) >= 0)
79 IOVEC_SET_STRING(iovec
[n
++], pid
);
81 if (asprintf(&uid
, "UID=%lu", (unsigned long) ucred
->uid
) >= 0)
82 IOVEC_SET_STRING(iovec
[n
++], uid
);
84 if (asprintf(&gid
, "GID=%lu", (unsigned long) ucred
->gid
) >= 0)
85 IOVEC_SET_STRING(iovec
[n
++], gid
);
87 r
= get_process_comm(ucred
->pid
, &t
);
89 comm
= strappend("COMM=", t
);
91 IOVEC_SET_STRING(iovec
[n
++], comm
);
95 r
= get_process_exe(ucred
->pid
, &t
);
97 exe
= strappend("EXE=", t
);
99 IOVEC_SET_STRING(iovec
[n
++], exe
);
103 r
= get_process_cmdline(ucred
->pid
, LINE_MAX
, false, &t
);
105 cmdline
= strappend("CMDLINE=", t
);
107 IOVEC_SET_STRING(iovec
[n
++], cmdline
);
111 r
= audit_session_from_pid(ucred
->pid
, &session
);
113 if (asprintf(&audit_session
, "AUDIT_SESSION=%lu", (unsigned long) session
) >= 0)
114 IOVEC_SET_STRING(iovec
[n
++], audit_session
);
116 r
= audit_loginuid_from_pid(ucred
->pid
, &loginuid
);
118 if (asprintf(&audit_loginuid
, "AUDIT_LOGINUID=%lu", (unsigned long) loginuid
) >= 0)
119 IOVEC_SET_STRING(iovec
[n
++], audit_loginuid
);
123 if (asprintf(&source_time
, "SOURCE_REALTIME_TIMESTAMP=%llu",
124 (unsigned long long) timeval_load(tv
)) >= 0)
125 IOVEC_SET_STRING(iovec
[n
++], source_time
);
128 r
= sd_id128_get_boot(&id
);
130 if (asprintf(&boot_id
, "BOOT_ID=%s", sd_id128_to_string(id
, idbuf
)) >= 0)
131 IOVEC_SET_STRING(iovec
[n
++], boot_id
);
133 r
= sd_id128_get_machine(&id
);
135 if (asprintf(&machine_id
, "MACHINE_ID=%s", sd_id128_to_string(id
, idbuf
)) >= 0)
136 IOVEC_SET_STRING(iovec
[n
++], machine_id
);
138 t
= gethostname_malloc();
140 hostname
= strappend("HOSTNAME=", t
);
142 IOVEC_SET_STRING(iovec
[n
++], hostname
);
146 r
= journal_file_append_entry(s
->system_journal
, &ts
, iovec
, n
, NULL
, NULL
);
148 log_error("Failed to write entry: %s", strerror(-r
));
162 free(audit_loginuid
);
163 free(syslog_facility
);
164 free(syslog_priority
);
167 static int process_event(Server
*s
, struct epoll_event
*ev
) {
170 if (ev
->events
!= EPOLLIN
) {
171 log_info("Got invalid event from epoll.");
175 if (ev
->data
.fd
== s
->signal_fd
) {
176 struct signalfd_siginfo sfsi
;
179 n
= read(s
->signal_fd
, &sfsi
, sizeof(sfsi
));
180 if (n
!= sizeof(sfsi
)) {
185 if (errno
== EINTR
|| errno
== EAGAIN
)
191 log_debug("Received SIG%s", signal_to_string(sfsi
.ssi_signo
));
196 char buf
[LINE_MAX
+1];
197 struct msghdr msghdr
;
199 struct ucred
*ucred
= NULL
;
200 struct timeval
*tv
= NULL
;
201 struct cmsghdr
*cmsg
;
203 struct cmsghdr cmsghdr
;
204 uint8_t buf
[CMSG_SPACE(sizeof(struct ucred
)) +
205 CMSG_SPACE(sizeof(struct timeval
))];
211 iovec
.iov_base
= buf
;
212 iovec
.iov_len
= sizeof(buf
)-1;
216 msghdr
.msg_iov
= &iovec
;
217 msghdr
.msg_iovlen
= 1;
218 msghdr
.msg_control
= &control
;
219 msghdr
.msg_controllen
= sizeof(control
);
221 n
= recvmsg(ev
->data
.fd
, &msghdr
, MSG_DONTWAIT
);
224 if (errno
== EINTR
|| errno
== EAGAIN
)
227 log_error("recvmsg() failed: %m");
231 for (cmsg
= CMSG_FIRSTHDR(&msghdr
); cmsg
; cmsg
= CMSG_NXTHDR(&msghdr
, cmsg
)) {
233 if (cmsg
->cmsg_level
== SOL_SOCKET
&&
234 cmsg
->cmsg_type
== SCM_CREDENTIALS
&&
235 cmsg
->cmsg_len
== CMSG_LEN(sizeof(struct ucred
)))
236 ucred
= (struct ucred
*) CMSG_DATA(cmsg
);
237 else if (cmsg
->cmsg_level
== SOL_SOCKET
&&
238 cmsg
->cmsg_type
== SO_TIMESTAMP
&&
239 cmsg
->cmsg_len
== CMSG_LEN(sizeof(struct timeval
)))
240 tv
= (struct timeval
*) CMSG_DATA(cmsg
);
243 e
= memchr(buf
, '\n', n
);
249 process_message(s
, strstrip(buf
), ucred
, tv
);
257 static int open_system_journal(JournalFile
**f
) {
260 r
= journal_file_open("/var/log/journal/system.journal", O_RDWR
|O_CREAT
, 0644, f
);
262 mkdir_p("/run/log/journal", 0755);
264 r
= journal_file_open("/run/log/journal/system.journal", O_RDWR
|O_CREAT
, 0644, f
);
270 static int server_init(Server
*s
) {
272 struct epoll_event ev
;
278 s
->syslog_fd
= s
->signal_fd
= -1;
280 s
->epoll_fd
= epoll_create1(EPOLL_CLOEXEC
);
281 if (s
->epoll_fd
< 0) {
282 log_error("Failed to create epoll object: %m");
286 n
= sd_listen_fds(true);
288 log_error("Failed to read listening file descriptors from environment: %s", strerror(-n
));
293 log_error("Too many file descriptors passed.");
298 s
->syslog_fd
= SD_LISTEN_FDS_START
;
300 union sockaddr_union sa
;
302 s
->syslog_fd
= socket(AF_UNIX
, SOCK_DGRAM
|SOCK_CLOEXEC
, 0);
303 if (s
->syslog_fd
< 0) {
304 log_error("socket() failed: %m");
309 sa
.un
.sun_family
= AF_UNIX
;
310 strncpy(sa
.un
.sun_path
, "/run/systemd/syslog", sizeof(sa
.un
.sun_path
));
312 unlink(sa
.un
.sun_path
);
314 r
= bind(s
->syslog_fd
, &sa
.sa
, sizeof(sa
.un
));
316 log_error("bind() failed: %m");
320 chmod(sa
.un
.sun_path
, 0666);
324 r
= setsockopt(s
->syslog_fd
, SOL_SOCKET
, SO_PASSCRED
, &one
, sizeof(one
));
326 log_error("SO_PASSCRED failed: %m");
331 r
= setsockopt(s
->syslog_fd
, SOL_SOCKET
, SO_TIMESTAMP
, &one
, sizeof(one
));
333 log_error("SO_TIMESTAMP failed: %m");
339 ev
.data
.fd
= s
->syslog_fd
;
340 if (epoll_ctl(s
->epoll_fd
, EPOLL_CTL_ADD
, s
->syslog_fd
, &ev
) < 0) {
341 log_error("Failed to add server fd to epoll object: %m");
345 s
->user_journals
= hashmap_new(trivial_hash_func
, trivial_compare_func
);
346 if (!s
->user_journals
) {
347 log_error("Out of memory.");
351 r
= open_system_journal(&s
->system_journal
);
353 log_error("Failed to open journal: %s", strerror(-r
));
357 assert_se(sigemptyset(&mask
) == 0);
358 sigset_add_many(&mask
, SIGINT
, SIGTERM
, -1);
359 assert_se(sigprocmask(SIG_SETMASK
, &mask
, NULL
) == 0);
361 s
->signal_fd
= signalfd(-1, &mask
, SFD_NONBLOCK
|SFD_CLOEXEC
);
362 if (s
->signal_fd
< 0) {
363 log_error("signalfd(): %m");
369 ev
.data
.fd
= s
->signal_fd
;
371 if (epoll_ctl(s
->epoll_fd
, EPOLL_CTL_ADD
, s
->signal_fd
, &ev
) < 0) {
372 log_error("epoll_ctl(): %m");
379 static void server_done(Server
*s
) {
383 if (s
->system_journal
)
384 journal_file_close(s
->system_journal
);
386 while ((f
= hashmap_steal_first(s
->user_journals
)))
387 journal_file_close(f
);
389 hashmap_free(s
->user_journals
);
391 if (s
->epoll_fd
>= 0)
392 close_nointr_nofail(s
->epoll_fd
);
394 if (s
->signal_fd
>= 0)
395 close_nointr_nofail(s
->signal_fd
);
397 if (s
->syslog_fd
>= 0)
398 close_nointr_nofail(s
->syslog_fd
);
401 int main(int argc
, char *argv
[]) {
405 /* if (getppid() != 1) { */
406 /* log_error("This program should be invoked by init only."); */
407 /* return EXIT_FAILURE; */
411 log_error("This program does not take arguments.");
415 log_set_target(LOG_TARGET_AUTO
);
416 log_parse_environment();
421 r
= server_init(&server
);
425 log_debug("systemd-journald running as pid %lu", (unsigned long) getpid());
429 "STATUS=Processing messages...");
432 struct epoll_event event
;
434 r
= epoll_wait(server
.epoll_fd
, &event
, 1, -1);
440 log_error("epoll_wait() failed: %m");
446 r
= process_event(&server
, &event
);
455 "STATUS=Shutting down...");
457 server_done(&server
);
459 return r
< 0 ? EXIT_FAILURE
: EXIT_SUCCESS
;