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Commit | Line | Data |
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35e2e347 LP |
1 | /*** |
2 | This file is part of systemd. | |
3 | ||
4 | Copyright 2011 Lennart Poettering | |
5 | ||
6 | systemd is free software; you can redistribute it and/or modify it | |
7 | under the terms of the GNU Lesser General Public License as published by | |
8 | the Free Software Foundation; either version 2.1 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | systemd is distributed in the hope that it will be useful, but | |
12 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public License | |
17 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
18 | ***/ | |
19 | ||
4871690d | 20 | #include <stddef.h> |
35e2e347 | 21 | #include <sys/epoll.h> |
07630cea | 22 | #include <unistd.h> |
35e2e347 | 23 | |
07630cea LP |
24 | #include "sd-messages.h" |
25 | ||
b5efdb8a | 26 | #include "alloc-util.h" |
3ffd4af2 | 27 | #include "fd-util.h" |
07630cea | 28 | #include "formats-util.h" |
afc5dbf3 | 29 | #include "io-util.h" |
3b7124a8 | 30 | #include "journald-console.h" |
07630cea LP |
31 | #include "journald-kmsg.h" |
32 | #include "journald-server.h" | |
3ffd4af2 | 33 | #include "journald-syslog.h" |
40b71e89 | 34 | #include "journald-wall.h" |
0b452006 | 35 | #include "process-util.h" |
07630cea LP |
36 | #include "selinux-util.h" |
37 | #include "socket-util.h" | |
15a5e950 | 38 | #include "stdio-util.h" |
07630cea | 39 | #include "string-util.h" |
7ccbd1ae | 40 | #include "syslog-util.h" |
35e2e347 | 41 | |
178cc770 LP |
42 | /* Warn once every 30s if we missed syslog message */ |
43 | #define WARN_FORWARD_SYSLOG_MISSED_USEC (30 * USEC_PER_SEC) | |
44 | ||
3b3154df | 45 | static void forward_syslog_iovec(Server *s, const struct iovec *iovec, unsigned n_iovec, const struct ucred *ucred, const struct timeval *tv) { |
b92bea5d | 46 | |
46b13157 | 47 | static const union sockaddr_union sa = { |
b92bea5d ZJS |
48 | .un.sun_family = AF_UNIX, |
49 | .un.sun_path = "/run/systemd/journal/syslog", | |
50 | }; | |
51 | struct msghdr msghdr = { | |
52 | .msg_iov = (struct iovec *) iovec, | |
53 | .msg_iovlen = n_iovec, | |
46b13157 | 54 | .msg_name = (struct sockaddr*) &sa.sa, |
b92bea5d | 55 | .msg_namelen = offsetof(union sockaddr_union, un.sun_path) |
f8294e41 | 56 | + strlen("/run/systemd/journal/syslog"), |
b92bea5d | 57 | }; |
35e2e347 LP |
58 | struct cmsghdr *cmsg; |
59 | union { | |
60 | struct cmsghdr cmsghdr; | |
61 | uint8_t buf[CMSG_SPACE(sizeof(struct ucred))]; | |
62 | } control; | |
35e2e347 LP |
63 | |
64 | assert(s); | |
65 | assert(iovec); | |
66 | assert(n_iovec > 0); | |
67 | ||
35e2e347 LP |
68 | if (ucred) { |
69 | zero(control); | |
70 | msghdr.msg_control = &control; | |
71 | msghdr.msg_controllen = sizeof(control); | |
72 | ||
73 | cmsg = CMSG_FIRSTHDR(&msghdr); | |
74 | cmsg->cmsg_level = SOL_SOCKET; | |
75 | cmsg->cmsg_type = SCM_CREDENTIALS; | |
76 | cmsg->cmsg_len = CMSG_LEN(sizeof(struct ucred)); | |
77 | memcpy(CMSG_DATA(cmsg), ucred, sizeof(struct ucred)); | |
78 | msghdr.msg_controllen = cmsg->cmsg_len; | |
79 | } | |
80 | ||
81 | /* Forward the syslog message we received via /dev/log to | |
82 | * /run/systemd/syslog. Unfortunately we currently can't set | |
83 | * the SO_TIMESTAMP auxiliary data, and hence we don't. */ | |
84 | ||
85 | if (sendmsg(s->syslog_fd, &msghdr, MSG_NOSIGNAL) >= 0) | |
86 | return; | |
87 | ||
88 | /* The socket is full? I guess the syslog implementation is | |
89 | * too slow, and we shouldn't wait for that... */ | |
178cc770 LP |
90 | if (errno == EAGAIN) { |
91 | s->n_forward_syslog_missed++; | |
35e2e347 | 92 | return; |
178cc770 | 93 | } |
35e2e347 | 94 | |
ccf23ad5 | 95 | if (ucred && (errno == ESRCH || errno == EPERM)) { |
35e2e347 LP |
96 | struct ucred u; |
97 | ||
98 | /* Hmm, presumably the sender process vanished | |
ccf23ad5 CS |
99 | * by now, or we don't have CAP_SYS_AMDIN, so |
100 | * let's fix it as good as we can, and retry */ | |
35e2e347 LP |
101 | |
102 | u = *ucred; | |
103 | u.pid = getpid(); | |
104 | memcpy(CMSG_DATA(cmsg), &u, sizeof(struct ucred)); | |
105 | ||
106 | if (sendmsg(s->syslog_fd, &msghdr, MSG_NOSIGNAL) >= 0) | |
107 | return; | |
108 | ||
178cc770 LP |
109 | if (errno == EAGAIN) { |
110 | s->n_forward_syslog_missed++; | |
35e2e347 | 111 | return; |
178cc770 | 112 | } |
35e2e347 LP |
113 | } |
114 | ||
115 | if (errno != ENOENT) | |
56f64d95 | 116 | log_debug_errno(errno, "Failed to forward syslog message: %m"); |
35e2e347 LP |
117 | } |
118 | ||
3b3154df | 119 | static void forward_syslog_raw(Server *s, int priority, const char *buffer, const struct ucred *ucred, const struct timeval *tv) { |
35e2e347 LP |
120 | struct iovec iovec; |
121 | ||
122 | assert(s); | |
123 | assert(buffer); | |
124 | ||
125 | if (LOG_PRI(priority) > s->max_level_syslog) | |
126 | return; | |
127 | ||
128 | IOVEC_SET_STRING(iovec, buffer); | |
129 | forward_syslog_iovec(s, &iovec, 1, ucred, tv); | |
130 | } | |
131 | ||
3b3154df | 132 | void server_forward_syslog(Server *s, int priority, const char *identifier, const char *message, const struct ucred *ucred, const struct timeval *tv) { |
35e2e347 | 133 | struct iovec iovec[5]; |
3b97fcbd | 134 | char header_priority[DECIMAL_STR_MAX(priority) + 3], header_time[64], |
5ffa8c81 | 135 | header_pid[sizeof("[]: ")-1 + DECIMAL_STR_MAX(pid_t) + 1]; |
35e2e347 LP |
136 | int n = 0; |
137 | time_t t; | |
138 | struct tm *tm; | |
139 | char *ident_buf = NULL; | |
140 | ||
141 | assert(s); | |
142 | assert(priority >= 0); | |
143 | assert(priority <= 999); | |
144 | assert(message); | |
145 | ||
146 | if (LOG_PRI(priority) > s->max_level_syslog) | |
147 | return; | |
148 | ||
149 | /* First: priority field */ | |
5ffa8c81 | 150 | xsprintf(header_priority, "<%i>", priority); |
35e2e347 LP |
151 | IOVEC_SET_STRING(iovec[n++], header_priority); |
152 | ||
153 | /* Second: timestamp */ | |
154 | t = tv ? tv->tv_sec : ((time_t) (now(CLOCK_REALTIME) / USEC_PER_SEC)); | |
155 | tm = localtime(&t); | |
156 | if (!tm) | |
157 | return; | |
158 | if (strftime(header_time, sizeof(header_time), "%h %e %T ", tm) <= 0) | |
159 | return; | |
160 | IOVEC_SET_STRING(iovec[n++], header_time); | |
161 | ||
162 | /* Third: identifier and PID */ | |
163 | if (ucred) { | |
164 | if (!identifier) { | |
165 | get_process_comm(ucred->pid, &ident_buf); | |
166 | identifier = ident_buf; | |
167 | } | |
168 | ||
5ffa8c81 | 169 | xsprintf(header_pid, "["PID_FMT"]: ", ucred->pid); |
35e2e347 LP |
170 | |
171 | if (identifier) | |
172 | IOVEC_SET_STRING(iovec[n++], identifier); | |
173 | ||
174 | IOVEC_SET_STRING(iovec[n++], header_pid); | |
175 | } else if (identifier) { | |
176 | IOVEC_SET_STRING(iovec[n++], identifier); | |
177 | IOVEC_SET_STRING(iovec[n++], ": "); | |
178 | } | |
179 | ||
180 | /* Fourth: message */ | |
181 | IOVEC_SET_STRING(iovec[n++], message); | |
182 | ||
183 | forward_syslog_iovec(s, iovec, n, ucred, tv); | |
184 | ||
185 | free(ident_buf); | |
186 | } | |
187 | ||
188 | int syslog_fixup_facility(int priority) { | |
189 | ||
190 | if ((priority & LOG_FACMASK) == 0) | |
191 | return (priority & LOG_PRIMASK) | LOG_USER; | |
192 | ||
193 | return priority; | |
194 | } | |
195 | ||
e88baee8 | 196 | size_t syslog_parse_identifier(const char **buf, char **identifier, char **pid) { |
35e2e347 LP |
197 | const char *p; |
198 | char *t; | |
199 | size_t l, e; | |
200 | ||
201 | assert(buf); | |
202 | assert(identifier); | |
203 | assert(pid); | |
204 | ||
205 | p = *buf; | |
206 | ||
207 | p += strspn(p, WHITESPACE); | |
208 | l = strcspn(p, WHITESPACE); | |
209 | ||
210 | if (l <= 0 || | |
211 | p[l-1] != ':') | |
e88baee8 | 212 | return 0; |
35e2e347 LP |
213 | |
214 | e = l; | |
215 | l--; | |
216 | ||
217 | if (p[l-1] == ']') { | |
218 | size_t k = l-1; | |
219 | ||
220 | for (;;) { | |
221 | ||
222 | if (p[k] == '[') { | |
223 | t = strndup(p+k+1, l-k-2); | |
224 | if (t) | |
225 | *pid = t; | |
226 | ||
227 | l = k; | |
228 | break; | |
229 | } | |
230 | ||
231 | if (k == 0) | |
232 | break; | |
233 | ||
234 | k--; | |
235 | } | |
236 | } | |
237 | ||
238 | t = strndup(p, l); | |
239 | if (t) | |
240 | *identifier = t; | |
241 | ||
ec5ff444 FB |
242 | if (strchr(WHITESPACE, p[e])) |
243 | e++; | |
35e2e347 | 244 | *buf = p + e; |
e88baee8 | 245 | return e; |
35e2e347 LP |
246 | } |
247 | ||
5809560d LP |
248 | static void syslog_skip_date(char **buf) { |
249 | enum { | |
250 | LETTER, | |
251 | SPACE, | |
252 | NUMBER, | |
253 | SPACE_OR_NUMBER, | |
254 | COLON | |
255 | } sequence[] = { | |
256 | LETTER, LETTER, LETTER, | |
257 | SPACE, | |
258 | SPACE_OR_NUMBER, NUMBER, | |
259 | SPACE, | |
260 | SPACE_OR_NUMBER, NUMBER, | |
261 | COLON, | |
262 | SPACE_OR_NUMBER, NUMBER, | |
263 | COLON, | |
264 | SPACE_OR_NUMBER, NUMBER, | |
265 | SPACE | |
266 | }; | |
267 | ||
268 | char *p; | |
269 | unsigned i; | |
270 | ||
271 | assert(buf); | |
272 | assert(*buf); | |
273 | ||
274 | p = *buf; | |
275 | ||
276 | for (i = 0; i < ELEMENTSOF(sequence); i++, p++) { | |
277 | ||
278 | if (!*p) | |
279 | return; | |
280 | ||
281 | switch (sequence[i]) { | |
282 | ||
283 | case SPACE: | |
284 | if (*p != ' ') | |
285 | return; | |
286 | break; | |
287 | ||
288 | case SPACE_OR_NUMBER: | |
289 | if (*p == ' ') | |
290 | break; | |
291 | ||
292 | /* fall through */ | |
293 | ||
294 | case NUMBER: | |
295 | if (*p < '0' || *p > '9') | |
296 | return; | |
297 | ||
298 | break; | |
299 | ||
300 | case LETTER: | |
301 | if (!(*p >= 'A' && *p <= 'Z') && | |
302 | !(*p >= 'a' && *p <= 'z')) | |
303 | return; | |
304 | ||
305 | break; | |
306 | ||
307 | case COLON: | |
308 | if (*p != ':') | |
309 | return; | |
310 | break; | |
311 | ||
312 | } | |
313 | } | |
314 | ||
315 | *buf = p; | |
316 | } | |
317 | ||
35e2e347 LP |
318 | void server_process_syslog_message( |
319 | Server *s, | |
320 | const char *buf, | |
3b3154df LP |
321 | const struct ucred *ucred, |
322 | const struct timeval *tv, | |
35e2e347 LP |
323 | const char *label, |
324 | size_t label_len) { | |
325 | ||
8457f8d6 | 326 | char syslog_priority[sizeof("PRIORITY=") + DECIMAL_STR_MAX(int)], |
13f5402c | 327 | syslog_facility[sizeof("SYSLOG_FACILITY=") + DECIMAL_STR_MAX(int)]; |
8457f8d6 | 328 | const char *message = NULL, *syslog_identifier = NULL, *syslog_pid = NULL; |
35e2e347 LP |
329 | struct iovec iovec[N_IOVEC_META_FIELDS + 6]; |
330 | unsigned n = 0; | |
331 | int priority = LOG_USER | LOG_INFO; | |
8457f8d6 | 332 | _cleanup_free_ char *identifier = NULL, *pid = NULL; |
35e2e347 LP |
333 | const char *orig; |
334 | ||
335 | assert(s); | |
336 | assert(buf); | |
337 | ||
338 | orig = buf; | |
e3bfb7be | 339 | syslog_parse_priority(&buf, &priority, true); |
35e2e347 LP |
340 | |
341 | if (s->forward_to_syslog) | |
342 | forward_syslog_raw(s, priority, orig, ucred, tv); | |
343 | ||
344 | syslog_skip_date((char**) &buf); | |
5809560d | 345 | syslog_parse_identifier(&buf, &identifier, &pid); |
35e2e347 LP |
346 | |
347 | if (s->forward_to_kmsg) | |
348 | server_forward_kmsg(s, priority, identifier, buf, ucred); | |
349 | ||
350 | if (s->forward_to_console) | |
351 | server_forward_console(s, priority, identifier, buf, ucred); | |
352 | ||
40b71e89 ST |
353 | if (s->forward_to_wall) |
354 | server_forward_wall(s, priority, identifier, buf, ucred); | |
355 | ||
35e2e347 LP |
356 | IOVEC_SET_STRING(iovec[n++], "_TRANSPORT=syslog"); |
357 | ||
d054f0a4 | 358 | xsprintf(syslog_priority, "PRIORITY=%i", priority & LOG_PRIMASK); |
8457f8d6 | 359 | IOVEC_SET_STRING(iovec[n++], syslog_priority); |
35e2e347 | 360 | |
8457f8d6 | 361 | if (priority & LOG_FACMASK) { |
d054f0a4 | 362 | xsprintf(syslog_facility, "SYSLOG_FACILITY=%i", LOG_FAC(priority)); |
8457f8d6 LP |
363 | IOVEC_SET_STRING(iovec[n++], syslog_facility); |
364 | } | |
35e2e347 LP |
365 | |
366 | if (identifier) { | |
63c372cb | 367 | syslog_identifier = strjoina("SYSLOG_IDENTIFIER=", identifier); |
35e2e347 LP |
368 | if (syslog_identifier) |
369 | IOVEC_SET_STRING(iovec[n++], syslog_identifier); | |
370 | } | |
371 | ||
372 | if (pid) { | |
63c372cb | 373 | syslog_pid = strjoina("SYSLOG_PID=", pid); |
35e2e347 LP |
374 | if (syslog_pid) |
375 | IOVEC_SET_STRING(iovec[n++], syslog_pid); | |
376 | } | |
377 | ||
63c372cb | 378 | message = strjoina("MESSAGE=", buf); |
35e2e347 LP |
379 | if (message) |
380 | IOVEC_SET_STRING(iovec[n++], message); | |
381 | ||
968f3196 | 382 | server_dispatch_message(s, iovec, n, ELEMENTSOF(iovec), ucred, tv, label, label_len, NULL, priority, 0); |
35e2e347 LP |
383 | } |
384 | ||
385 | int server_open_syslog_socket(Server *s) { | |
3b3154df LP |
386 | static const int one = 1; |
387 | int r; | |
35e2e347 LP |
388 | |
389 | assert(s); | |
390 | ||
391 | if (s->syslog_fd < 0) { | |
46b13157 | 392 | static const union sockaddr_union sa = { |
b92bea5d | 393 | .un.sun_family = AF_UNIX, |
03ee5c38 | 394 | .un.sun_path = "/run/systemd/journal/dev-log", |
b92bea5d | 395 | }; |
35e2e347 LP |
396 | |
397 | s->syslog_fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); | |
4a62c710 MS |
398 | if (s->syslog_fd < 0) |
399 | return log_error_errno(errno, "socket() failed: %m"); | |
35e2e347 | 400 | |
35e2e347 LP |
401 | unlink(sa.un.sun_path); |
402 | ||
403 | r = bind(s->syslog_fd, &sa.sa, offsetof(union sockaddr_union, un.sun_path) + strlen(sa.un.sun_path)); | |
4a62c710 MS |
404 | if (r < 0) |
405 | return log_error_errno(errno, "bind(%s) failed: %m", sa.un.sun_path); | |
35e2e347 | 406 | |
4a61c3e5 | 407 | (void) chmod(sa.un.sun_path, 0666); |
35e2e347 LP |
408 | } else |
409 | fd_nonblock(s->syslog_fd, 1); | |
410 | ||
35e2e347 | 411 | r = setsockopt(s->syslog_fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)); |
4a62c710 MS |
412 | if (r < 0) |
413 | return log_error_errno(errno, "SO_PASSCRED failed: %m"); | |
35e2e347 LP |
414 | |
415 | #ifdef HAVE_SELINUX | |
6355e756 | 416 | if (mac_selinux_have()) { |
d682b3a7 LP |
417 | r = setsockopt(s->syslog_fd, SOL_SOCKET, SO_PASSSEC, &one, sizeof(one)); |
418 | if (r < 0) | |
56f64d95 | 419 | log_warning_errno(errno, "SO_PASSSEC failed: %m"); |
d682b3a7 | 420 | } |
35e2e347 LP |
421 | #endif |
422 | ||
35e2e347 | 423 | r = setsockopt(s->syslog_fd, SOL_SOCKET, SO_TIMESTAMP, &one, sizeof(one)); |
4a62c710 MS |
424 | if (r < 0) |
425 | return log_error_errno(errno, "SO_TIMESTAMP failed: %m"); | |
35e2e347 | 426 | |
8531ae70 | 427 | r = sd_event_add_io(s->event, &s->syslog_event_source, s->syslog_fd, EPOLLIN, server_process_datagram, s); |
23bbb0de MS |
428 | if (r < 0) |
429 | return log_error_errno(r, "Failed to add syslog server fd to event loop: %m"); | |
35e2e347 | 430 | |
48cef295 VC |
431 | r = sd_event_source_set_priority(s->syslog_event_source, SD_EVENT_PRIORITY_NORMAL+5); |
432 | if (r < 0) | |
433 | return log_error_errno(r, "Failed to adjust syslog event source priority: %m"); | |
434 | ||
35e2e347 LP |
435 | return 0; |
436 | } | |
178cc770 LP |
437 | |
438 | void server_maybe_warn_forward_syslog_missed(Server *s) { | |
439 | usec_t n; | |
440 | assert(s); | |
441 | ||
442 | if (s->n_forward_syslog_missed <= 0) | |
443 | return; | |
444 | ||
445 | n = now(CLOCK_MONOTONIC); | |
446 | if (s->last_warn_forward_syslog_missed + WARN_FORWARD_SYSLOG_MISSED_USEC > n) | |
447 | return; | |
448 | ||
8a03c9ef ZJS |
449 | server_driver_message(s, SD_MESSAGE_FORWARD_SYSLOG_MISSED, |
450 | LOG_MESSAGE("Forwarding to syslog missed %u messages.", | |
451 | s->n_forward_syslog_missed), | |
452 | NULL); | |
178cc770 LP |
453 | |
454 | s->n_forward_syslog_missed = 0; | |
455 | s->last_warn_forward_syslog_missed = n; | |
456 | } |