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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
35e2e347 | 2 | |
4871690d | 3 | #include <stddef.h> |
35e2e347 | 4 | #include <sys/epoll.h> |
07630cea | 5 | #include <unistd.h> |
35e2e347 | 6 | |
07630cea LP |
7 | #include "sd-messages.h" |
8 | ||
b5efdb8a | 9 | #include "alloc-util.h" |
3ffd4af2 | 10 | #include "fd-util.h" |
f97b34a6 | 11 | #include "format-util.h" |
afc5dbf3 | 12 | #include "io-util.h" |
3b7124a8 | 13 | #include "journald-console.h" |
07630cea LP |
14 | #include "journald-kmsg.h" |
15 | #include "journald-server.h" | |
3ffd4af2 | 16 | #include "journald-syslog.h" |
40b71e89 | 17 | #include "journald-wall.h" |
0b452006 | 18 | #include "process-util.h" |
07630cea LP |
19 | #include "selinux-util.h" |
20 | #include "socket-util.h" | |
15a5e950 | 21 | #include "stdio-util.h" |
07630cea | 22 | #include "string-util.h" |
7ccbd1ae | 23 | #include "syslog-util.h" |
35e2e347 | 24 | |
178cc770 LP |
25 | /* Warn once every 30s if we missed syslog message */ |
26 | #define WARN_FORWARD_SYSLOG_MISSED_USEC (30 * USEC_PER_SEC) | |
27 | ||
3b3154df | 28 | static void forward_syslog_iovec(Server *s, const struct iovec *iovec, unsigned n_iovec, const struct ucred *ucred, const struct timeval *tv) { |
b92bea5d | 29 | |
46b13157 | 30 | static const union sockaddr_union sa = { |
b92bea5d ZJS |
31 | .un.sun_family = AF_UNIX, |
32 | .un.sun_path = "/run/systemd/journal/syslog", | |
33 | }; | |
34 | struct msghdr msghdr = { | |
35 | .msg_iov = (struct iovec *) iovec, | |
36 | .msg_iovlen = n_iovec, | |
46b13157 | 37 | .msg_name = (struct sockaddr*) &sa.sa, |
fc2fffe7 | 38 | .msg_namelen = SOCKADDR_UN_LEN(sa.un), |
b92bea5d | 39 | }; |
35e2e347 LP |
40 | struct cmsghdr *cmsg; |
41 | union { | |
42 | struct cmsghdr cmsghdr; | |
43 | uint8_t buf[CMSG_SPACE(sizeof(struct ucred))]; | |
44 | } control; | |
35e2e347 LP |
45 | |
46 | assert(s); | |
47 | assert(iovec); | |
48 | assert(n_iovec > 0); | |
49 | ||
35e2e347 LP |
50 | if (ucred) { |
51 | zero(control); | |
52 | msghdr.msg_control = &control; | |
53 | msghdr.msg_controllen = sizeof(control); | |
54 | ||
55 | cmsg = CMSG_FIRSTHDR(&msghdr); | |
56 | cmsg->cmsg_level = SOL_SOCKET; | |
57 | cmsg->cmsg_type = SCM_CREDENTIALS; | |
58 | cmsg->cmsg_len = CMSG_LEN(sizeof(struct ucred)); | |
59 | memcpy(CMSG_DATA(cmsg), ucred, sizeof(struct ucred)); | |
60 | msghdr.msg_controllen = cmsg->cmsg_len; | |
61 | } | |
62 | ||
63 | /* Forward the syslog message we received via /dev/log to | |
64 | * /run/systemd/syslog. Unfortunately we currently can't set | |
65 | * the SO_TIMESTAMP auxiliary data, and hence we don't. */ | |
66 | ||
67 | if (sendmsg(s->syslog_fd, &msghdr, MSG_NOSIGNAL) >= 0) | |
68 | return; | |
69 | ||
70 | /* The socket is full? I guess the syslog implementation is | |
71 | * too slow, and we shouldn't wait for that... */ | |
178cc770 LP |
72 | if (errno == EAGAIN) { |
73 | s->n_forward_syslog_missed++; | |
35e2e347 | 74 | return; |
178cc770 | 75 | } |
35e2e347 | 76 | |
3742095b | 77 | if (ucred && IN_SET(errno, ESRCH, EPERM)) { |
35e2e347 LP |
78 | struct ucred u; |
79 | ||
80 | /* Hmm, presumably the sender process vanished | |
ccf23ad5 CS |
81 | * by now, or we don't have CAP_SYS_AMDIN, so |
82 | * let's fix it as good as we can, and retry */ | |
35e2e347 LP |
83 | |
84 | u = *ucred; | |
df0ff127 | 85 | u.pid = getpid_cached(); |
35e2e347 LP |
86 | memcpy(CMSG_DATA(cmsg), &u, sizeof(struct ucred)); |
87 | ||
88 | if (sendmsg(s->syslog_fd, &msghdr, MSG_NOSIGNAL) >= 0) | |
89 | return; | |
90 | ||
178cc770 LP |
91 | if (errno == EAGAIN) { |
92 | s->n_forward_syslog_missed++; | |
35e2e347 | 93 | return; |
178cc770 | 94 | } |
35e2e347 LP |
95 | } |
96 | ||
97 | if (errno != ENOENT) | |
56f64d95 | 98 | log_debug_errno(errno, "Failed to forward syslog message: %m"); |
35e2e347 LP |
99 | } |
100 | ||
bb3ff70a | 101 | static void forward_syslog_raw(Server *s, int priority, const char *buffer, size_t buffer_len, const struct ucred *ucred, const struct timeval *tv) { |
35e2e347 LP |
102 | struct iovec iovec; |
103 | ||
104 | assert(s); | |
105 | assert(buffer); | |
106 | ||
107 | if (LOG_PRI(priority) > s->max_level_syslog) | |
108 | return; | |
109 | ||
bb3ff70a | 110 | iovec = IOVEC_MAKE((char *) buffer, buffer_len); |
35e2e347 LP |
111 | forward_syslog_iovec(s, &iovec, 1, ucred, tv); |
112 | } | |
113 | ||
3b3154df | 114 | void server_forward_syslog(Server *s, int priority, const char *identifier, const char *message, const struct ucred *ucred, const struct timeval *tv) { |
35e2e347 | 115 | struct iovec iovec[5]; |
3b97fcbd | 116 | char header_priority[DECIMAL_STR_MAX(priority) + 3], header_time[64], |
fbd0b64f | 117 | header_pid[STRLEN("[]: ") + DECIMAL_STR_MAX(pid_t) + 1]; |
35e2e347 LP |
118 | int n = 0; |
119 | time_t t; | |
120 | struct tm *tm; | |
e6a7ec4b | 121 | _cleanup_free_ char *ident_buf = NULL; |
35e2e347 LP |
122 | |
123 | assert(s); | |
124 | assert(priority >= 0); | |
125 | assert(priority <= 999); | |
126 | assert(message); | |
127 | ||
128 | if (LOG_PRI(priority) > s->max_level_syslog) | |
129 | return; | |
130 | ||
131 | /* First: priority field */ | |
5ffa8c81 | 132 | xsprintf(header_priority, "<%i>", priority); |
e6a7ec4b | 133 | iovec[n++] = IOVEC_MAKE_STRING(header_priority); |
35e2e347 LP |
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; | |
e6a7ec4b | 142 | iovec[n++] = IOVEC_MAKE_STRING(header_time); |
35e2e347 LP |
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 | ||
5ffa8c81 | 151 | xsprintf(header_pid, "["PID_FMT"]: ", ucred->pid); |
35e2e347 LP |
152 | |
153 | if (identifier) | |
e6a7ec4b | 154 | iovec[n++] = IOVEC_MAKE_STRING(identifier); |
35e2e347 | 155 | |
e6a7ec4b | 156 | iovec[n++] = IOVEC_MAKE_STRING(header_pid); |
35e2e347 | 157 | } else if (identifier) { |
e6a7ec4b LP |
158 | iovec[n++] = IOVEC_MAKE_STRING(identifier); |
159 | iovec[n++] = IOVEC_MAKE_STRING(": "); | |
35e2e347 LP |
160 | } |
161 | ||
162 | /* Fourth: message */ | |
e6a7ec4b | 163 | iovec[n++] = IOVEC_MAKE_STRING(message); |
35e2e347 LP |
164 | |
165 | forward_syslog_iovec(s, iovec, n, ucred, tv); | |
35e2e347 LP |
166 | } |
167 | ||
168 | int syslog_fixup_facility(int priority) { | |
169 | ||
170 | if ((priority & LOG_FACMASK) == 0) | |
171 | return (priority & LOG_PRIMASK) | LOG_USER; | |
172 | ||
173 | return priority; | |
174 | } | |
175 | ||
e88baee8 | 176 | size_t syslog_parse_identifier(const char **buf, char **identifier, char **pid) { |
35e2e347 LP |
177 | const char *p; |
178 | char *t; | |
179 | size_t l, e; | |
180 | ||
181 | assert(buf); | |
182 | assert(identifier); | |
183 | assert(pid); | |
184 | ||
185 | p = *buf; | |
186 | ||
187 | p += strspn(p, WHITESPACE); | |
188 | l = strcspn(p, WHITESPACE); | |
189 | ||
190 | if (l <= 0 || | |
191 | p[l-1] != ':') | |
e88baee8 | 192 | return 0; |
35e2e347 LP |
193 | |
194 | e = l; | |
195 | l--; | |
196 | ||
197 | if (p[l-1] == ']') { | |
198 | size_t k = l-1; | |
199 | ||
200 | for (;;) { | |
201 | ||
202 | if (p[k] == '[') { | |
203 | t = strndup(p+k+1, l-k-2); | |
204 | if (t) | |
205 | *pid = t; | |
206 | ||
207 | l = k; | |
208 | break; | |
209 | } | |
210 | ||
211 | if (k == 0) | |
212 | break; | |
213 | ||
214 | k--; | |
215 | } | |
216 | } | |
217 | ||
218 | t = strndup(p, l); | |
219 | if (t) | |
220 | *identifier = t; | |
221 | ||
ec5ff444 FB |
222 | if (strchr(WHITESPACE, p[e])) |
223 | e++; | |
35e2e347 | 224 | *buf = p + e; |
e88baee8 | 225 | return e; |
35e2e347 LP |
226 | } |
227 | ||
c3950a9b | 228 | static void syslog_skip_date(const char **buf) { |
5809560d LP |
229 | enum { |
230 | LETTER, | |
231 | SPACE, | |
232 | NUMBER, | |
233 | SPACE_OR_NUMBER, | |
234 | COLON | |
235 | } sequence[] = { | |
236 | LETTER, LETTER, LETTER, | |
237 | SPACE, | |
238 | SPACE_OR_NUMBER, NUMBER, | |
239 | SPACE, | |
240 | SPACE_OR_NUMBER, NUMBER, | |
241 | COLON, | |
242 | SPACE_OR_NUMBER, NUMBER, | |
243 | COLON, | |
244 | SPACE_OR_NUMBER, NUMBER, | |
245 | SPACE | |
246 | }; | |
247 | ||
c3950a9b | 248 | const char *p; |
5809560d LP |
249 | unsigned i; |
250 | ||
251 | assert(buf); | |
252 | assert(*buf); | |
253 | ||
254 | p = *buf; | |
255 | ||
256 | for (i = 0; i < ELEMENTSOF(sequence); i++, p++) { | |
257 | ||
258 | if (!*p) | |
259 | return; | |
260 | ||
261 | switch (sequence[i]) { | |
262 | ||
263 | case SPACE: | |
264 | if (*p != ' ') | |
265 | return; | |
266 | break; | |
267 | ||
268 | case SPACE_OR_NUMBER: | |
269 | if (*p == ' ') | |
270 | break; | |
271 | ||
4831981d | 272 | _fallthrough_; |
5809560d LP |
273 | case NUMBER: |
274 | if (*p < '0' || *p > '9') | |
275 | return; | |
276 | ||
277 | break; | |
278 | ||
279 | case LETTER: | |
280 | if (!(*p >= 'A' && *p <= 'Z') && | |
281 | !(*p >= 'a' && *p <= 'z')) | |
282 | return; | |
283 | ||
284 | break; | |
285 | ||
286 | case COLON: | |
287 | if (*p != ':') | |
288 | return; | |
289 | break; | |
290 | ||
291 | } | |
292 | } | |
293 | ||
294 | *buf = p; | |
295 | } | |
296 | ||
35e2e347 | 297 | void server_process_syslog_message( |
23be5709 LP |
298 | Server *s, |
299 | const char *buf, | |
c3950a9b | 300 | size_t raw_len, |
23be5709 LP |
301 | const struct ucred *ucred, |
302 | const struct timeval *tv, | |
303 | const char *label, | |
304 | size_t label_len) { | |
35e2e347 | 305 | |
8457f8d6 | 306 | char syslog_priority[sizeof("PRIORITY=") + DECIMAL_STR_MAX(int)], |
c3950a9b ZJS |
307 | syslog_facility[sizeof("SYSLOG_FACILITY=") + DECIMAL_STR_MAX(int)]; |
308 | const char *message = NULL, *syslog_identifier = NULL, *syslog_pid = NULL, *msg; | |
8457f8d6 | 309 | _cleanup_free_ char *identifier = NULL, *pid = NULL; |
22e3a02b LP |
310 | int priority = LOG_USER | LOG_INFO, r; |
311 | ClientContext *context = NULL; | |
d3070fbd | 312 | struct iovec *iovec; |
c3950a9b | 313 | size_t n = 0, m, i, leading_ws; |
35e2e347 LP |
314 | |
315 | assert(s); | |
316 | assert(buf); | |
c3950a9b ZJS |
317 | /* The message cannot be empty. */ |
318 | assert(raw_len > 0); | |
319 | /* The buffer NUL-terminated and can be used a string. raw_len is the length | |
320 | * without the terminating NUL byte, the buffer is actually one bigger. */ | |
321 | assert(buf[raw_len] == '\0'); | |
35e2e347 | 322 | |
d3070fbd LP |
323 | if (ucred && pid_is_valid(ucred->pid)) { |
324 | r = client_context_get(s, ucred->pid, ucred, label, label_len, NULL, &context); | |
325 | if (r < 0) | |
326 | log_warning_errno(r, "Failed to retrieve credentials for PID " PID_FMT ", ignoring: %m", ucred->pid); | |
327 | } | |
328 | ||
c3950a9b ZJS |
329 | /* We are creating a copy of the message because we want to forward the original message |
330 | verbatim to the legacy syslog implementation */ | |
331 | for (i = raw_len; i > 0; i--) | |
bb3ff70a MS |
332 | if (!strchr(WHITESPACE, buf[i-1])) |
333 | break; | |
334 | ||
c3950a9b ZJS |
335 | leading_ws = strspn(buf, WHITESPACE); |
336 | ||
337 | if (i == raw_len) | |
338 | /* Nice! No need to strip anything on the end, let's optimize this a bit */ | |
339 | msg = buf + leading_ws; | |
340 | else { | |
341 | char *t; | |
342 | ||
343 | msg = t = newa(char, i - leading_ws + 1); | |
344 | memcpy(t, buf + leading_ws, i - leading_ws); | |
345 | t[i - leading_ws] = 0; | |
346 | } | |
bb3ff70a | 347 | |
c3950a9b | 348 | syslog_parse_priority(&msg, &priority, true); |
35e2e347 | 349 | |
d3070fbd LP |
350 | if (!client_context_test_priority(context, priority)) |
351 | return; | |
352 | ||
bb3ff70a | 353 | syslog_skip_date(&msg); |
c3950a9b ZJS |
354 | syslog_parse_identifier(&msg, &identifier, &pid); |
355 | ||
356 | if (s->forward_to_syslog) | |
357 | forward_syslog_raw(s, priority, buf, raw_len, ucred, tv); | |
35e2e347 LP |
358 | |
359 | if (s->forward_to_kmsg) | |
bb3ff70a | 360 | server_forward_kmsg(s, priority, identifier, msg, ucred); |
35e2e347 LP |
361 | |
362 | if (s->forward_to_console) | |
bb3ff70a | 363 | server_forward_console(s, priority, identifier, msg, ucred); |
35e2e347 | 364 | |
40b71e89 | 365 | if (s->forward_to_wall) |
bb3ff70a | 366 | server_forward_wall(s, priority, identifier, msg, ucred); |
40b71e89 | 367 | |
d3070fbd LP |
368 | m = N_IOVEC_META_FIELDS + 6 + client_context_extra_fields_n_iovec(context); |
369 | iovec = newa(struct iovec, m); | |
370 | ||
e6a7ec4b | 371 | iovec[n++] = IOVEC_MAKE_STRING("_TRANSPORT=syslog"); |
35e2e347 | 372 | |
d054f0a4 | 373 | xsprintf(syslog_priority, "PRIORITY=%i", priority & LOG_PRIMASK); |
e6a7ec4b | 374 | iovec[n++] = IOVEC_MAKE_STRING(syslog_priority); |
35e2e347 | 375 | |
8457f8d6 | 376 | if (priority & LOG_FACMASK) { |
d054f0a4 | 377 | xsprintf(syslog_facility, "SYSLOG_FACILITY=%i", LOG_FAC(priority)); |
e6a7ec4b | 378 | iovec[n++] = IOVEC_MAKE_STRING(syslog_facility); |
8457f8d6 | 379 | } |
35e2e347 LP |
380 | |
381 | if (identifier) { | |
63c372cb | 382 | syslog_identifier = strjoina("SYSLOG_IDENTIFIER=", identifier); |
e6a7ec4b | 383 | iovec[n++] = IOVEC_MAKE_STRING(syslog_identifier); |
35e2e347 LP |
384 | } |
385 | ||
386 | if (pid) { | |
63c372cb | 387 | syslog_pid = strjoina("SYSLOG_PID=", pid); |
e6a7ec4b | 388 | iovec[n++] = IOVEC_MAKE_STRING(syslog_pid); |
35e2e347 LP |
389 | } |
390 | ||
bb3ff70a | 391 | message = strjoina("MESSAGE=", msg); |
35e2e347 | 392 | if (message) |
e6a7ec4b | 393 | iovec[n++] = IOVEC_MAKE_STRING(message); |
35e2e347 | 394 | |
d3070fbd | 395 | server_dispatch_message(s, iovec, n, m, context, tv, priority, 0); |
35e2e347 LP |
396 | } |
397 | ||
398 | int server_open_syslog_socket(Server *s) { | |
fc2fffe7 LP |
399 | |
400 | static const union sockaddr_union sa = { | |
401 | .un.sun_family = AF_UNIX, | |
402 | .un.sun_path = "/run/systemd/journal/dev-log", | |
403 | }; | |
3b3154df LP |
404 | static const int one = 1; |
405 | int r; | |
35e2e347 LP |
406 | |
407 | assert(s); | |
408 | ||
409 | if (s->syslog_fd < 0) { | |
35e2e347 | 410 | s->syslog_fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); |
4a62c710 MS |
411 | if (s->syslog_fd < 0) |
412 | return log_error_errno(errno, "socket() failed: %m"); | |
35e2e347 | 413 | |
fc2fffe7 | 414 | (void) unlink(sa.un.sun_path); |
35e2e347 | 415 | |
fc2fffe7 | 416 | r = bind(s->syslog_fd, &sa.sa, SOCKADDR_UN_LEN(sa.un)); |
4a62c710 MS |
417 | if (r < 0) |
418 | return log_error_errno(errno, "bind(%s) failed: %m", sa.un.sun_path); | |
35e2e347 | 419 | |
4a61c3e5 | 420 | (void) chmod(sa.un.sun_path, 0666); |
35e2e347 LP |
421 | } else |
422 | fd_nonblock(s->syslog_fd, 1); | |
423 | ||
35e2e347 | 424 | r = setsockopt(s->syslog_fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)); |
4a62c710 MS |
425 | if (r < 0) |
426 | return log_error_errno(errno, "SO_PASSCRED failed: %m"); | |
35e2e347 | 427 | |
349cc4a5 | 428 | #if HAVE_SELINUX |
6d395665 | 429 | if (mac_selinux_use()) { |
d682b3a7 LP |
430 | r = setsockopt(s->syslog_fd, SOL_SOCKET, SO_PASSSEC, &one, sizeof(one)); |
431 | if (r < 0) | |
56f64d95 | 432 | log_warning_errno(errno, "SO_PASSSEC failed: %m"); |
d682b3a7 | 433 | } |
35e2e347 LP |
434 | #endif |
435 | ||
35e2e347 | 436 | r = setsockopt(s->syslog_fd, SOL_SOCKET, SO_TIMESTAMP, &one, sizeof(one)); |
4a62c710 MS |
437 | if (r < 0) |
438 | return log_error_errno(errno, "SO_TIMESTAMP failed: %m"); | |
35e2e347 | 439 | |
8531ae70 | 440 | r = sd_event_add_io(s->event, &s->syslog_event_source, s->syslog_fd, EPOLLIN, server_process_datagram, s); |
23bbb0de MS |
441 | if (r < 0) |
442 | return log_error_errno(r, "Failed to add syslog server fd to event loop: %m"); | |
35e2e347 | 443 | |
48cef295 VC |
444 | r = sd_event_source_set_priority(s->syslog_event_source, SD_EVENT_PRIORITY_NORMAL+5); |
445 | if (r < 0) | |
446 | return log_error_errno(r, "Failed to adjust syslog event source priority: %m"); | |
447 | ||
35e2e347 LP |
448 | return 0; |
449 | } | |
178cc770 LP |
450 | |
451 | void server_maybe_warn_forward_syslog_missed(Server *s) { | |
452 | usec_t n; | |
fc2fffe7 | 453 | |
178cc770 LP |
454 | assert(s); |
455 | ||
456 | if (s->n_forward_syslog_missed <= 0) | |
457 | return; | |
458 | ||
459 | n = now(CLOCK_MONOTONIC); | |
460 | if (s->last_warn_forward_syslog_missed + WARN_FORWARD_SYSLOG_MISSED_USEC > n) | |
461 | return; | |
462 | ||
13181942 | 463 | server_driver_message(s, 0, |
2b044526 | 464 | "MESSAGE_ID=" SD_MESSAGE_FORWARD_SYSLOG_MISSED_STR, |
8a03c9ef ZJS |
465 | LOG_MESSAGE("Forwarding to syslog missed %u messages.", |
466 | s->n_forward_syslog_missed), | |
467 | NULL); | |
178cc770 LP |
468 | |
469 | s->n_forward_syslog_missed = 0; | |
470 | s->last_warn_forward_syslog_missed = n; | |
471 | } |