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35e2e347 LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2011 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
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 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
4871690d | 22 | #include <stddef.h> |
35e2e347 | 23 | #include <sys/epoll.h> |
07630cea | 24 | #include <unistd.h> |
35e2e347 | 25 | |
07630cea LP |
26 | #include "sd-messages.h" |
27 | ||
3ffd4af2 | 28 | #include "fd-util.h" |
07630cea | 29 | #include "formats-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" | |
38 | #include "string-util.h" | |
35e2e347 | 39 | |
178cc770 LP |
40 | /* Warn once every 30s if we missed syslog message */ |
41 | #define WARN_FORWARD_SYSLOG_MISSED_USEC (30 * USEC_PER_SEC) | |
42 | ||
3b3154df | 43 | static void forward_syslog_iovec(Server *s, const struct iovec *iovec, unsigned n_iovec, const struct ucred *ucred, const struct timeval *tv) { |
b92bea5d | 44 | |
46b13157 | 45 | static const union sockaddr_union sa = { |
b92bea5d ZJS |
46 | .un.sun_family = AF_UNIX, |
47 | .un.sun_path = "/run/systemd/journal/syslog", | |
48 | }; | |
49 | struct msghdr msghdr = { | |
50 | .msg_iov = (struct iovec *) iovec, | |
51 | .msg_iovlen = n_iovec, | |
46b13157 | 52 | .msg_name = (struct sockaddr*) &sa.sa, |
b92bea5d | 53 | .msg_namelen = offsetof(union sockaddr_union, un.sun_path) |
f8294e41 | 54 | + strlen("/run/systemd/journal/syslog"), |
b92bea5d | 55 | }; |
35e2e347 LP |
56 | struct cmsghdr *cmsg; |
57 | union { | |
58 | struct cmsghdr cmsghdr; | |
59 | uint8_t buf[CMSG_SPACE(sizeof(struct ucred))]; | |
60 | } control; | |
35e2e347 LP |
61 | |
62 | assert(s); | |
63 | assert(iovec); | |
64 | assert(n_iovec > 0); | |
65 | ||
35e2e347 LP |
66 | if (ucred) { |
67 | zero(control); | |
68 | msghdr.msg_control = &control; | |
69 | msghdr.msg_controllen = sizeof(control); | |
70 | ||
71 | cmsg = CMSG_FIRSTHDR(&msghdr); | |
72 | cmsg->cmsg_level = SOL_SOCKET; | |
73 | cmsg->cmsg_type = SCM_CREDENTIALS; | |
74 | cmsg->cmsg_len = CMSG_LEN(sizeof(struct ucred)); | |
75 | memcpy(CMSG_DATA(cmsg), ucred, sizeof(struct ucred)); | |
76 | msghdr.msg_controllen = cmsg->cmsg_len; | |
77 | } | |
78 | ||
79 | /* Forward the syslog message we received via /dev/log to | |
80 | * /run/systemd/syslog. Unfortunately we currently can't set | |
81 | * the SO_TIMESTAMP auxiliary data, and hence we don't. */ | |
82 | ||
83 | if (sendmsg(s->syslog_fd, &msghdr, MSG_NOSIGNAL) >= 0) | |
84 | return; | |
85 | ||
86 | /* The socket is full? I guess the syslog implementation is | |
87 | * too slow, and we shouldn't wait for that... */ | |
178cc770 LP |
88 | if (errno == EAGAIN) { |
89 | s->n_forward_syslog_missed++; | |
35e2e347 | 90 | return; |
178cc770 | 91 | } |
35e2e347 | 92 | |
ccf23ad5 | 93 | if (ucred && (errno == ESRCH || errno == EPERM)) { |
35e2e347 LP |
94 | struct ucred u; |
95 | ||
96 | /* Hmm, presumably the sender process vanished | |
ccf23ad5 CS |
97 | * by now, or we don't have CAP_SYS_AMDIN, so |
98 | * let's fix it as good as we can, and retry */ | |
35e2e347 LP |
99 | |
100 | u = *ucred; | |
101 | u.pid = getpid(); | |
102 | memcpy(CMSG_DATA(cmsg), &u, sizeof(struct ucred)); | |
103 | ||
104 | if (sendmsg(s->syslog_fd, &msghdr, MSG_NOSIGNAL) >= 0) | |
105 | return; | |
106 | ||
178cc770 LP |
107 | if (errno == EAGAIN) { |
108 | s->n_forward_syslog_missed++; | |
35e2e347 | 109 | return; |
178cc770 | 110 | } |
35e2e347 LP |
111 | } |
112 | ||
113 | if (errno != ENOENT) | |
56f64d95 | 114 | log_debug_errno(errno, "Failed to forward syslog message: %m"); |
35e2e347 LP |
115 | } |
116 | ||
3b3154df | 117 | static void forward_syslog_raw(Server *s, int priority, const char *buffer, const struct ucred *ucred, const struct timeval *tv) { |
35e2e347 LP |
118 | struct iovec iovec; |
119 | ||
120 | assert(s); | |
121 | assert(buffer); | |
122 | ||
123 | if (LOG_PRI(priority) > s->max_level_syslog) | |
124 | return; | |
125 | ||
126 | IOVEC_SET_STRING(iovec, buffer); | |
127 | forward_syslog_iovec(s, &iovec, 1, ucred, tv); | |
128 | } | |
129 | ||
3b3154df | 130 | void server_forward_syslog(Server *s, int priority, const char *identifier, const char *message, const struct ucred *ucred, const struct timeval *tv) { |
35e2e347 | 131 | struct iovec iovec[5]; |
3b97fcbd | 132 | char header_priority[DECIMAL_STR_MAX(priority) + 3], header_time[64], |
5ffa8c81 | 133 | header_pid[sizeof("[]: ")-1 + DECIMAL_STR_MAX(pid_t) + 1]; |
35e2e347 LP |
134 | int n = 0; |
135 | time_t t; | |
136 | struct tm *tm; | |
137 | char *ident_buf = NULL; | |
138 | ||
139 | assert(s); | |
140 | assert(priority >= 0); | |
141 | assert(priority <= 999); | |
142 | assert(message); | |
143 | ||
144 | if (LOG_PRI(priority) > s->max_level_syslog) | |
145 | return; | |
146 | ||
147 | /* First: priority field */ | |
5ffa8c81 | 148 | xsprintf(header_priority, "<%i>", priority); |
35e2e347 LP |
149 | IOVEC_SET_STRING(iovec[n++], header_priority); |
150 | ||
151 | /* Second: timestamp */ | |
152 | t = tv ? tv->tv_sec : ((time_t) (now(CLOCK_REALTIME) / USEC_PER_SEC)); | |
153 | tm = localtime(&t); | |
154 | if (!tm) | |
155 | return; | |
156 | if (strftime(header_time, sizeof(header_time), "%h %e %T ", tm) <= 0) | |
157 | return; | |
158 | IOVEC_SET_STRING(iovec[n++], header_time); | |
159 | ||
160 | /* Third: identifier and PID */ | |
161 | if (ucred) { | |
162 | if (!identifier) { | |
163 | get_process_comm(ucred->pid, &ident_buf); | |
164 | identifier = ident_buf; | |
165 | } | |
166 | ||
5ffa8c81 | 167 | xsprintf(header_pid, "["PID_FMT"]: ", ucred->pid); |
35e2e347 LP |
168 | |
169 | if (identifier) | |
170 | IOVEC_SET_STRING(iovec[n++], identifier); | |
171 | ||
172 | IOVEC_SET_STRING(iovec[n++], header_pid); | |
173 | } else if (identifier) { | |
174 | IOVEC_SET_STRING(iovec[n++], identifier); | |
175 | IOVEC_SET_STRING(iovec[n++], ": "); | |
176 | } | |
177 | ||
178 | /* Fourth: message */ | |
179 | IOVEC_SET_STRING(iovec[n++], message); | |
180 | ||
181 | forward_syslog_iovec(s, iovec, n, ucred, tv); | |
182 | ||
183 | free(ident_buf); | |
184 | } | |
185 | ||
186 | int syslog_fixup_facility(int priority) { | |
187 | ||
188 | if ((priority & LOG_FACMASK) == 0) | |
189 | return (priority & LOG_PRIMASK) | LOG_USER; | |
190 | ||
191 | return priority; | |
192 | } | |
193 | ||
e88baee8 | 194 | size_t syslog_parse_identifier(const char **buf, char **identifier, char **pid) { |
35e2e347 LP |
195 | const char *p; |
196 | char *t; | |
197 | size_t l, e; | |
198 | ||
199 | assert(buf); | |
200 | assert(identifier); | |
201 | assert(pid); | |
202 | ||
203 | p = *buf; | |
204 | ||
205 | p += strspn(p, WHITESPACE); | |
206 | l = strcspn(p, WHITESPACE); | |
207 | ||
208 | if (l <= 0 || | |
209 | p[l-1] != ':') | |
e88baee8 | 210 | return 0; |
35e2e347 LP |
211 | |
212 | e = l; | |
213 | l--; | |
214 | ||
215 | if (p[l-1] == ']') { | |
216 | size_t k = l-1; | |
217 | ||
218 | for (;;) { | |
219 | ||
220 | if (p[k] == '[') { | |
221 | t = strndup(p+k+1, l-k-2); | |
222 | if (t) | |
223 | *pid = t; | |
224 | ||
225 | l = k; | |
226 | break; | |
227 | } | |
228 | ||
229 | if (k == 0) | |
230 | break; | |
231 | ||
232 | k--; | |
233 | } | |
234 | } | |
235 | ||
236 | t = strndup(p, l); | |
237 | if (t) | |
238 | *identifier = t; | |
239 | ||
ec5ff444 FB |
240 | if (strchr(WHITESPACE, p[e])) |
241 | e++; | |
35e2e347 | 242 | *buf = p + e; |
e88baee8 | 243 | return e; |
35e2e347 LP |
244 | } |
245 | ||
5809560d LP |
246 | static void syslog_skip_date(char **buf) { |
247 | enum { | |
248 | LETTER, | |
249 | SPACE, | |
250 | NUMBER, | |
251 | SPACE_OR_NUMBER, | |
252 | COLON | |
253 | } sequence[] = { | |
254 | LETTER, LETTER, LETTER, | |
255 | SPACE, | |
256 | SPACE_OR_NUMBER, NUMBER, | |
257 | SPACE, | |
258 | SPACE_OR_NUMBER, NUMBER, | |
259 | COLON, | |
260 | SPACE_OR_NUMBER, NUMBER, | |
261 | COLON, | |
262 | SPACE_OR_NUMBER, NUMBER, | |
263 | SPACE | |
264 | }; | |
265 | ||
266 | char *p; | |
267 | unsigned i; | |
268 | ||
269 | assert(buf); | |
270 | assert(*buf); | |
271 | ||
272 | p = *buf; | |
273 | ||
274 | for (i = 0; i < ELEMENTSOF(sequence); i++, p++) { | |
275 | ||
276 | if (!*p) | |
277 | return; | |
278 | ||
279 | switch (sequence[i]) { | |
280 | ||
281 | case SPACE: | |
282 | if (*p != ' ') | |
283 | return; | |
284 | break; | |
285 | ||
286 | case SPACE_OR_NUMBER: | |
287 | if (*p == ' ') | |
288 | break; | |
289 | ||
290 | /* fall through */ | |
291 | ||
292 | case NUMBER: | |
293 | if (*p < '0' || *p > '9') | |
294 | return; | |
295 | ||
296 | break; | |
297 | ||
298 | case LETTER: | |
299 | if (!(*p >= 'A' && *p <= 'Z') && | |
300 | !(*p >= 'a' && *p <= 'z')) | |
301 | return; | |
302 | ||
303 | break; | |
304 | ||
305 | case COLON: | |
306 | if (*p != ':') | |
307 | return; | |
308 | break; | |
309 | ||
310 | } | |
311 | } | |
312 | ||
313 | *buf = p; | |
314 | } | |
315 | ||
35e2e347 LP |
316 | void server_process_syslog_message( |
317 | Server *s, | |
318 | const char *buf, | |
3b3154df LP |
319 | const struct ucred *ucred, |
320 | const struct timeval *tv, | |
35e2e347 LP |
321 | const char *label, |
322 | size_t label_len) { | |
323 | ||
8457f8d6 LP |
324 | char syslog_priority[sizeof("PRIORITY=") + DECIMAL_STR_MAX(int)], |
325 | syslog_facility[sizeof("SYSLOG_FACILITY") + DECIMAL_STR_MAX(int)]; | |
326 | const char *message = NULL, *syslog_identifier = NULL, *syslog_pid = NULL; | |
35e2e347 LP |
327 | struct iovec iovec[N_IOVEC_META_FIELDS + 6]; |
328 | unsigned n = 0; | |
329 | int priority = LOG_USER | LOG_INFO; | |
8457f8d6 | 330 | _cleanup_free_ char *identifier = NULL, *pid = NULL; |
35e2e347 LP |
331 | const char *orig; |
332 | ||
333 | assert(s); | |
334 | assert(buf); | |
335 | ||
336 | orig = buf; | |
e3bfb7be | 337 | syslog_parse_priority(&buf, &priority, true); |
35e2e347 LP |
338 | |
339 | if (s->forward_to_syslog) | |
340 | forward_syslog_raw(s, priority, orig, ucred, tv); | |
341 | ||
342 | syslog_skip_date((char**) &buf); | |
5809560d | 343 | syslog_parse_identifier(&buf, &identifier, &pid); |
35e2e347 LP |
344 | |
345 | if (s->forward_to_kmsg) | |
346 | server_forward_kmsg(s, priority, identifier, buf, ucred); | |
347 | ||
348 | if (s->forward_to_console) | |
349 | server_forward_console(s, priority, identifier, buf, ucred); | |
350 | ||
40b71e89 ST |
351 | if (s->forward_to_wall) |
352 | server_forward_wall(s, priority, identifier, buf, ucred); | |
353 | ||
35e2e347 LP |
354 | IOVEC_SET_STRING(iovec[n++], "_TRANSPORT=syslog"); |
355 | ||
8457f8d6 LP |
356 | sprintf(syslog_priority, "PRIORITY=%i", priority & LOG_PRIMASK); |
357 | IOVEC_SET_STRING(iovec[n++], syslog_priority); | |
35e2e347 | 358 | |
8457f8d6 LP |
359 | if (priority & LOG_FACMASK) { |
360 | sprintf(syslog_facility, "SYSLOG_FACILITY=%i", LOG_FAC(priority)); | |
361 | IOVEC_SET_STRING(iovec[n++], syslog_facility); | |
362 | } | |
35e2e347 LP |
363 | |
364 | if (identifier) { | |
63c372cb | 365 | syslog_identifier = strjoina("SYSLOG_IDENTIFIER=", identifier); |
35e2e347 LP |
366 | if (syslog_identifier) |
367 | IOVEC_SET_STRING(iovec[n++], syslog_identifier); | |
368 | } | |
369 | ||
370 | if (pid) { | |
63c372cb | 371 | syslog_pid = strjoina("SYSLOG_PID=", pid); |
35e2e347 LP |
372 | if (syslog_pid) |
373 | IOVEC_SET_STRING(iovec[n++], syslog_pid); | |
374 | } | |
375 | ||
63c372cb | 376 | message = strjoina("MESSAGE=", buf); |
35e2e347 LP |
377 | if (message) |
378 | IOVEC_SET_STRING(iovec[n++], message); | |
379 | ||
968f3196 | 380 | server_dispatch_message(s, iovec, n, ELEMENTSOF(iovec), ucred, tv, label, label_len, NULL, priority, 0); |
35e2e347 LP |
381 | } |
382 | ||
383 | int server_open_syslog_socket(Server *s) { | |
3b3154df LP |
384 | static const int one = 1; |
385 | int r; | |
35e2e347 LP |
386 | |
387 | assert(s); | |
388 | ||
389 | if (s->syslog_fd < 0) { | |
46b13157 | 390 | static const union sockaddr_union sa = { |
b92bea5d | 391 | .un.sun_family = AF_UNIX, |
03ee5c38 | 392 | .un.sun_path = "/run/systemd/journal/dev-log", |
b92bea5d | 393 | }; |
35e2e347 LP |
394 | |
395 | s->syslog_fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); | |
4a62c710 MS |
396 | if (s->syslog_fd < 0) |
397 | return log_error_errno(errno, "socket() failed: %m"); | |
35e2e347 | 398 | |
35e2e347 LP |
399 | unlink(sa.un.sun_path); |
400 | ||
401 | r = bind(s->syslog_fd, &sa.sa, offsetof(union sockaddr_union, un.sun_path) + strlen(sa.un.sun_path)); | |
4a62c710 MS |
402 | if (r < 0) |
403 | return log_error_errno(errno, "bind(%s) failed: %m", sa.un.sun_path); | |
35e2e347 | 404 | |
4a61c3e5 | 405 | (void) chmod(sa.un.sun_path, 0666); |
35e2e347 LP |
406 | } else |
407 | fd_nonblock(s->syslog_fd, 1); | |
408 | ||
35e2e347 | 409 | r = setsockopt(s->syslog_fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)); |
4a62c710 MS |
410 | if (r < 0) |
411 | return log_error_errno(errno, "SO_PASSCRED failed: %m"); | |
35e2e347 LP |
412 | |
413 | #ifdef HAVE_SELINUX | |
6baa7db0 | 414 | if (mac_selinux_use()) { |
d682b3a7 LP |
415 | r = setsockopt(s->syslog_fd, SOL_SOCKET, SO_PASSSEC, &one, sizeof(one)); |
416 | if (r < 0) | |
56f64d95 | 417 | log_warning_errno(errno, "SO_PASSSEC failed: %m"); |
d682b3a7 | 418 | } |
35e2e347 LP |
419 | #endif |
420 | ||
35e2e347 | 421 | r = setsockopt(s->syslog_fd, SOL_SOCKET, SO_TIMESTAMP, &one, sizeof(one)); |
4a62c710 MS |
422 | if (r < 0) |
423 | return log_error_errno(errno, "SO_TIMESTAMP failed: %m"); | |
35e2e347 | 424 | |
8531ae70 | 425 | r = sd_event_add_io(s->event, &s->syslog_event_source, s->syslog_fd, EPOLLIN, server_process_datagram, s); |
23bbb0de MS |
426 | if (r < 0) |
427 | return log_error_errno(r, "Failed to add syslog server fd to event loop: %m"); | |
35e2e347 LP |
428 | |
429 | return 0; | |
430 | } | |
178cc770 LP |
431 | |
432 | void server_maybe_warn_forward_syslog_missed(Server *s) { | |
433 | usec_t n; | |
434 | assert(s); | |
435 | ||
436 | if (s->n_forward_syslog_missed <= 0) | |
437 | return; | |
438 | ||
439 | n = now(CLOCK_MONOTONIC); | |
440 | if (s->last_warn_forward_syslog_missed + WARN_FORWARD_SYSLOG_MISSED_USEC > n) | |
441 | return; | |
442 | ||
443 | server_driver_message(s, SD_MESSAGE_FORWARD_SYSLOG_MISSED, "Forwarding to syslog missed %u messages.", s->n_forward_syslog_missed); | |
444 | ||
445 | s->n_forward_syslog_missed = 0; | |
446 | s->last_warn_forward_syslog_missed = n; | |
447 | } |