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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 | ||
22 | #include <unistd.h> | |
23 | #include <sys/epoll.h> | |
24 | ||
25 | #include "socket-util.h" | |
26 | #include "journald.h" | |
27 | #include "journald-syslog.h" | |
28 | #include "journald-kmsg.h" | |
3b7124a8 | 29 | #include "journald-console.h" |
35e2e347 LP |
30 | |
31 | static void forward_syslog_iovec(Server *s, const struct iovec *iovec, unsigned n_iovec, struct ucred *ucred, struct timeval *tv) { | |
32 | struct msghdr msghdr; | |
33 | struct cmsghdr *cmsg; | |
34 | union { | |
35 | struct cmsghdr cmsghdr; | |
36 | uint8_t buf[CMSG_SPACE(sizeof(struct ucred))]; | |
37 | } control; | |
38 | union sockaddr_union sa; | |
39 | ||
40 | assert(s); | |
41 | assert(iovec); | |
42 | assert(n_iovec > 0); | |
43 | ||
44 | zero(msghdr); | |
45 | msghdr.msg_iov = (struct iovec*) iovec; | |
46 | msghdr.msg_iovlen = n_iovec; | |
47 | ||
48 | zero(sa); | |
49 | sa.un.sun_family = AF_UNIX; | |
50 | strncpy(sa.un.sun_path, "/run/systemd/journal/syslog", sizeof(sa.un.sun_path)); | |
51 | msghdr.msg_name = &sa; | |
52 | msghdr.msg_namelen = offsetof(union sockaddr_union, un.sun_path) + strlen(sa.un.sun_path); | |
53 | ||
54 | if (ucred) { | |
55 | zero(control); | |
56 | msghdr.msg_control = &control; | |
57 | msghdr.msg_controllen = sizeof(control); | |
58 | ||
59 | cmsg = CMSG_FIRSTHDR(&msghdr); | |
60 | cmsg->cmsg_level = SOL_SOCKET; | |
61 | cmsg->cmsg_type = SCM_CREDENTIALS; | |
62 | cmsg->cmsg_len = CMSG_LEN(sizeof(struct ucred)); | |
63 | memcpy(CMSG_DATA(cmsg), ucred, sizeof(struct ucred)); | |
64 | msghdr.msg_controllen = cmsg->cmsg_len; | |
65 | } | |
66 | ||
67 | /* Forward the syslog message we received via /dev/log to | |
68 | * /run/systemd/syslog. Unfortunately we currently can't set | |
69 | * the SO_TIMESTAMP auxiliary data, and hence we don't. */ | |
70 | ||
71 | if (sendmsg(s->syslog_fd, &msghdr, MSG_NOSIGNAL) >= 0) | |
72 | return; | |
73 | ||
74 | /* The socket is full? I guess the syslog implementation is | |
75 | * too slow, and we shouldn't wait for that... */ | |
76 | if (errno == EAGAIN) | |
77 | return; | |
78 | ||
79 | if (ucred && errno == ESRCH) { | |
80 | struct ucred u; | |
81 | ||
82 | /* Hmm, presumably the sender process vanished | |
83 | * by now, so let's fix it as good as we | |
84 | * can, and retry */ | |
85 | ||
86 | u = *ucred; | |
87 | u.pid = getpid(); | |
88 | memcpy(CMSG_DATA(cmsg), &u, sizeof(struct ucred)); | |
89 | ||
90 | if (sendmsg(s->syslog_fd, &msghdr, MSG_NOSIGNAL) >= 0) | |
91 | return; | |
92 | ||
93 | if (errno == EAGAIN) | |
94 | return; | |
95 | } | |
96 | ||
97 | if (errno != ENOENT) | |
98 | log_debug("Failed to forward syslog message: %m"); | |
99 | } | |
100 | ||
101 | static void forward_syslog_raw(Server *s, int priority, const char *buffer, struct ucred *ucred, struct timeval *tv) { | |
102 | struct iovec iovec; | |
103 | ||
104 | assert(s); | |
105 | assert(buffer); | |
106 | ||
107 | if (LOG_PRI(priority) > s->max_level_syslog) | |
108 | return; | |
109 | ||
110 | IOVEC_SET_STRING(iovec, buffer); | |
111 | forward_syslog_iovec(s, &iovec, 1, ucred, tv); | |
112 | } | |
113 | ||
114 | void server_forward_syslog(Server *s, int priority, const char *identifier, const char *message, struct ucred *ucred, struct timeval *tv) { | |
115 | struct iovec iovec[5]; | |
116 | char header_priority[6], header_time[64], header_pid[16]; | |
117 | int n = 0; | |
118 | time_t t; | |
119 | struct tm *tm; | |
120 | char *ident_buf = NULL; | |
121 | ||
122 | assert(s); | |
123 | assert(priority >= 0); | |
124 | assert(priority <= 999); | |
125 | assert(message); | |
126 | ||
127 | if (LOG_PRI(priority) > s->max_level_syslog) | |
128 | return; | |
129 | ||
130 | /* First: priority field */ | |
131 | snprintf(header_priority, sizeof(header_priority), "<%i>", priority); | |
132 | char_array_0(header_priority); | |
133 | IOVEC_SET_STRING(iovec[n++], header_priority); | |
134 | ||
135 | /* Second: timestamp */ | |
136 | t = tv ? tv->tv_sec : ((time_t) (now(CLOCK_REALTIME) / USEC_PER_SEC)); | |
137 | tm = localtime(&t); | |
138 | if (!tm) | |
139 | return; | |
140 | if (strftime(header_time, sizeof(header_time), "%h %e %T ", tm) <= 0) | |
141 | return; | |
142 | IOVEC_SET_STRING(iovec[n++], header_time); | |
143 | ||
144 | /* Third: identifier and PID */ | |
145 | if (ucred) { | |
146 | if (!identifier) { | |
147 | get_process_comm(ucred->pid, &ident_buf); | |
148 | identifier = ident_buf; | |
149 | } | |
150 | ||
151 | snprintf(header_pid, sizeof(header_pid), "[%lu]: ", (unsigned long) ucred->pid); | |
152 | char_array_0(header_pid); | |
153 | ||
154 | if (identifier) | |
155 | IOVEC_SET_STRING(iovec[n++], identifier); | |
156 | ||
157 | IOVEC_SET_STRING(iovec[n++], header_pid); | |
158 | } else if (identifier) { | |
159 | IOVEC_SET_STRING(iovec[n++], identifier); | |
160 | IOVEC_SET_STRING(iovec[n++], ": "); | |
161 | } | |
162 | ||
163 | /* Fourth: message */ | |
164 | IOVEC_SET_STRING(iovec[n++], message); | |
165 | ||
166 | forward_syslog_iovec(s, iovec, n, ucred, tv); | |
167 | ||
168 | free(ident_buf); | |
169 | } | |
170 | ||
171 | int syslog_fixup_facility(int priority) { | |
172 | ||
173 | if ((priority & LOG_FACMASK) == 0) | |
174 | return (priority & LOG_PRIMASK) | LOG_USER; | |
175 | ||
176 | return priority; | |
177 | } | |
178 | ||
5809560d | 179 | void syslog_parse_identifier(const char **buf, char **identifier, char **pid) { |
35e2e347 LP |
180 | const char *p; |
181 | char *t; | |
182 | size_t l, e; | |
183 | ||
184 | assert(buf); | |
185 | assert(identifier); | |
186 | assert(pid); | |
187 | ||
188 | p = *buf; | |
189 | ||
190 | p += strspn(p, WHITESPACE); | |
191 | l = strcspn(p, WHITESPACE); | |
192 | ||
193 | if (l <= 0 || | |
194 | p[l-1] != ':') | |
195 | return; | |
196 | ||
197 | e = l; | |
198 | l--; | |
199 | ||
200 | if (p[l-1] == ']') { | |
201 | size_t k = l-1; | |
202 | ||
203 | for (;;) { | |
204 | ||
205 | if (p[k] == '[') { | |
206 | t = strndup(p+k+1, l-k-2); | |
207 | if (t) | |
208 | *pid = t; | |
209 | ||
210 | l = k; | |
211 | break; | |
212 | } | |
213 | ||
214 | if (k == 0) | |
215 | break; | |
216 | ||
217 | k--; | |
218 | } | |
219 | } | |
220 | ||
221 | t = strndup(p, l); | |
222 | if (t) | |
223 | *identifier = t; | |
224 | ||
225 | *buf = p + e; | |
226 | *buf += strspn(*buf, WHITESPACE); | |
227 | } | |
228 | ||
5809560d LP |
229 | void syslog_parse_priority(char **p, int *priority) { |
230 | int a = 0, b = 0, c = 0; | |
231 | int k; | |
232 | ||
233 | assert(p); | |
234 | assert(*p); | |
235 | assert(priority); | |
236 | ||
237 | if ((*p)[0] != '<') | |
238 | return; | |
239 | ||
240 | if (!strchr(*p, '>')) | |
241 | return; | |
242 | ||
243 | if ((*p)[2] == '>') { | |
244 | c = undecchar((*p)[1]); | |
245 | k = 3; | |
246 | } else if ((*p)[3] == '>') { | |
247 | b = undecchar((*p)[1]); | |
248 | c = undecchar((*p)[2]); | |
249 | k = 4; | |
250 | } else if ((*p)[4] == '>') { | |
251 | a = undecchar((*p)[1]); | |
252 | b = undecchar((*p)[2]); | |
253 | c = undecchar((*p)[3]); | |
254 | k = 5; | |
255 | } else | |
256 | return; | |
257 | ||
258 | if (a < 0 || b < 0 || c < 0) | |
259 | return; | |
260 | ||
261 | *priority = a*100+b*10+c; | |
262 | *p += k; | |
263 | } | |
264 | ||
265 | static void syslog_skip_date(char **buf) { | |
266 | enum { | |
267 | LETTER, | |
268 | SPACE, | |
269 | NUMBER, | |
270 | SPACE_OR_NUMBER, | |
271 | COLON | |
272 | } sequence[] = { | |
273 | LETTER, LETTER, LETTER, | |
274 | SPACE, | |
275 | SPACE_OR_NUMBER, NUMBER, | |
276 | SPACE, | |
277 | SPACE_OR_NUMBER, NUMBER, | |
278 | COLON, | |
279 | SPACE_OR_NUMBER, NUMBER, | |
280 | COLON, | |
281 | SPACE_OR_NUMBER, NUMBER, | |
282 | SPACE | |
283 | }; | |
284 | ||
285 | char *p; | |
286 | unsigned i; | |
287 | ||
288 | assert(buf); | |
289 | assert(*buf); | |
290 | ||
291 | p = *buf; | |
292 | ||
293 | for (i = 0; i < ELEMENTSOF(sequence); i++, p++) { | |
294 | ||
295 | if (!*p) | |
296 | return; | |
297 | ||
298 | switch (sequence[i]) { | |
299 | ||
300 | case SPACE: | |
301 | if (*p != ' ') | |
302 | return; | |
303 | break; | |
304 | ||
305 | case SPACE_OR_NUMBER: | |
306 | if (*p == ' ') | |
307 | break; | |
308 | ||
309 | /* fall through */ | |
310 | ||
311 | case NUMBER: | |
312 | if (*p < '0' || *p > '9') | |
313 | return; | |
314 | ||
315 | break; | |
316 | ||
317 | case LETTER: | |
318 | if (!(*p >= 'A' && *p <= 'Z') && | |
319 | !(*p >= 'a' && *p <= 'z')) | |
320 | return; | |
321 | ||
322 | break; | |
323 | ||
324 | case COLON: | |
325 | if (*p != ':') | |
326 | return; | |
327 | break; | |
328 | ||
329 | } | |
330 | } | |
331 | ||
332 | *buf = p; | |
333 | } | |
334 | ||
35e2e347 LP |
335 | void server_process_syslog_message( |
336 | Server *s, | |
337 | const char *buf, | |
338 | struct ucred *ucred, | |
339 | struct timeval *tv, | |
340 | const char *label, | |
341 | size_t label_len) { | |
342 | ||
343 | char *message = NULL, *syslog_priority = NULL, *syslog_facility = NULL, *syslog_identifier = NULL, *syslog_pid = NULL; | |
344 | struct iovec iovec[N_IOVEC_META_FIELDS + 6]; | |
345 | unsigned n = 0; | |
346 | int priority = LOG_USER | LOG_INFO; | |
347 | char *identifier = NULL, *pid = NULL; | |
348 | const char *orig; | |
349 | ||
350 | assert(s); | |
351 | assert(buf); | |
352 | ||
353 | orig = buf; | |
354 | syslog_parse_priority((char**) &buf, &priority); | |
355 | ||
356 | if (s->forward_to_syslog) | |
357 | forward_syslog_raw(s, priority, orig, ucred, tv); | |
358 | ||
359 | syslog_skip_date((char**) &buf); | |
5809560d | 360 | syslog_parse_identifier(&buf, &identifier, &pid); |
35e2e347 LP |
361 | |
362 | if (s->forward_to_kmsg) | |
363 | server_forward_kmsg(s, priority, identifier, buf, ucred); | |
364 | ||
365 | if (s->forward_to_console) | |
366 | server_forward_console(s, priority, identifier, buf, ucred); | |
367 | ||
368 | IOVEC_SET_STRING(iovec[n++], "_TRANSPORT=syslog"); | |
369 | ||
370 | if (asprintf(&syslog_priority, "PRIORITY=%i", priority & LOG_PRIMASK) >= 0) | |
371 | IOVEC_SET_STRING(iovec[n++], syslog_priority); | |
372 | ||
373 | if (priority & LOG_FACMASK) | |
374 | if (asprintf(&syslog_facility, "SYSLOG_FACILITY=%i", LOG_FAC(priority)) >= 0) | |
375 | IOVEC_SET_STRING(iovec[n++], syslog_facility); | |
376 | ||
377 | if (identifier) { | |
378 | syslog_identifier = strappend("SYSLOG_IDENTIFIER=", identifier); | |
379 | if (syslog_identifier) | |
380 | IOVEC_SET_STRING(iovec[n++], syslog_identifier); | |
381 | } | |
382 | ||
383 | if (pid) { | |
384 | syslog_pid = strappend("SYSLOG_PID=", pid); | |
385 | if (syslog_pid) | |
386 | IOVEC_SET_STRING(iovec[n++], syslog_pid); | |
387 | } | |
388 | ||
389 | message = strappend("MESSAGE=", buf); | |
390 | if (message) | |
391 | IOVEC_SET_STRING(iovec[n++], message); | |
392 | ||
393 | server_dispatch_message(s, iovec, n, ELEMENTSOF(iovec), ucred, tv, label, label_len, NULL, priority); | |
394 | ||
395 | free(message); | |
396 | free(identifier); | |
397 | free(pid); | |
398 | free(syslog_priority); | |
399 | free(syslog_facility); | |
400 | free(syslog_identifier); | |
401 | free(syslog_pid); | |
402 | } | |
403 | ||
404 | int server_open_syslog_socket(Server *s) { | |
405 | union sockaddr_union sa; | |
406 | int one, r; | |
407 | struct epoll_event ev; | |
408 | ||
409 | assert(s); | |
410 | ||
411 | if (s->syslog_fd < 0) { | |
412 | ||
413 | s->syslog_fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); | |
414 | if (s->syslog_fd < 0) { | |
415 | log_error("socket() failed: %m"); | |
416 | return -errno; | |
417 | } | |
418 | ||
419 | zero(sa); | |
420 | sa.un.sun_family = AF_UNIX; | |
421 | strncpy(sa.un.sun_path, "/dev/log", sizeof(sa.un.sun_path)); | |
422 | ||
423 | unlink(sa.un.sun_path); | |
424 | ||
425 | r = bind(s->syslog_fd, &sa.sa, offsetof(union sockaddr_union, un.sun_path) + strlen(sa.un.sun_path)); | |
426 | if (r < 0) { | |
427 | log_error("bind() failed: %m"); | |
428 | return -errno; | |
429 | } | |
430 | ||
431 | chmod(sa.un.sun_path, 0666); | |
432 | } else | |
433 | fd_nonblock(s->syslog_fd, 1); | |
434 | ||
435 | one = 1; | |
436 | r = setsockopt(s->syslog_fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)); | |
437 | if (r < 0) { | |
438 | log_error("SO_PASSCRED failed: %m"); | |
439 | return -errno; | |
440 | } | |
441 | ||
442 | #ifdef HAVE_SELINUX | |
443 | one = 1; | |
444 | r = setsockopt(s->syslog_fd, SOL_SOCKET, SO_PASSSEC, &one, sizeof(one)); | |
445 | if (r < 0) | |
446 | log_warning("SO_PASSSEC failed: %m"); | |
447 | #endif | |
448 | ||
449 | one = 1; | |
450 | r = setsockopt(s->syslog_fd, SOL_SOCKET, SO_TIMESTAMP, &one, sizeof(one)); | |
451 | if (r < 0) { | |
452 | log_error("SO_TIMESTAMP failed: %m"); | |
453 | return -errno; | |
454 | } | |
455 | ||
456 | zero(ev); | |
457 | ev.events = EPOLLIN; | |
458 | ev.data.fd = s->syslog_fd; | |
459 | if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->syslog_fd, &ev) < 0) { | |
460 | log_error("Failed to add syslog server fd to epoll object: %m"); | |
461 | return -errno; | |
462 | } | |
463 | ||
464 | return 0; | |
465 | } |