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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 <fcntl.h> | |
23 | #include <unistd.h> | |
24 | #include <sys/epoll.h> | |
25 | ||
26 | #ifdef HAVE_SELINUX | |
27 | #include <selinux/selinux.h> | |
28 | #endif | |
29 | ||
30 | #include "socket-util.h" | |
31 | #include "journald.h" | |
32 | #include "journald-stream.h" | |
33 | #include "journald-syslog.h" | |
34 | #include "journald-kmsg.h" | |
3b7124a8 | 35 | #include "journald-console.h" |
a45b9fca LP |
36 | |
37 | #define STDOUT_STREAMS_MAX 4096 | |
38 | ||
39 | typedef enum StdoutStreamState { | |
40 | STDOUT_STREAM_IDENTIFIER, | |
41 | STDOUT_STREAM_UNIT_ID, | |
42 | STDOUT_STREAM_PRIORITY, | |
43 | STDOUT_STREAM_LEVEL_PREFIX, | |
44 | STDOUT_STREAM_FORWARD_TO_SYSLOG, | |
45 | STDOUT_STREAM_FORWARD_TO_KMSG, | |
46 | STDOUT_STREAM_FORWARD_TO_CONSOLE, | |
47 | STDOUT_STREAM_RUNNING | |
48 | } StdoutStreamState; | |
49 | ||
50 | struct StdoutStream { | |
51 | Server *server; | |
52 | StdoutStreamState state; | |
53 | ||
54 | int fd; | |
55 | ||
56 | struct ucred ucred; | |
57 | #ifdef HAVE_SELINUX | |
58 | security_context_t security_context; | |
59 | #endif | |
60 | ||
61 | char *identifier; | |
62 | char *unit_id; | |
63 | int priority; | |
64 | bool level_prefix:1; | |
65 | bool forward_to_syslog:1; | |
66 | bool forward_to_kmsg:1; | |
67 | bool forward_to_console:1; | |
68 | ||
69 | char buffer[LINE_MAX+1]; | |
70 | size_t length; | |
71 | ||
72 | LIST_FIELDS(StdoutStream, stdout_stream); | |
73 | }; | |
74 | ||
75 | static int stdout_stream_log(StdoutStream *s, const char *p) { | |
76 | struct iovec iovec[N_IOVEC_META_FIELDS + 5]; | |
77 | char *message = NULL, *syslog_priority = NULL, *syslog_facility = NULL, *syslog_identifier = NULL; | |
78 | unsigned n = 0; | |
79 | int priority; | |
80 | char *label = NULL; | |
81 | size_t label_len = 0; | |
82 | ||
83 | assert(s); | |
84 | assert(p); | |
85 | ||
86 | if (isempty(p)) | |
87 | return 0; | |
88 | ||
89 | priority = s->priority; | |
90 | ||
91 | if (s->level_prefix) | |
92 | syslog_parse_priority((char**) &p, &priority); | |
93 | ||
94 | if (s->forward_to_syslog || s->server->forward_to_syslog) | |
95 | server_forward_syslog(s->server, syslog_fixup_facility(priority), s->identifier, p, &s->ucred, NULL); | |
96 | ||
97 | if (s->forward_to_kmsg || s->server->forward_to_kmsg) | |
98 | server_forward_kmsg(s->server, priority, s->identifier, p, &s->ucred); | |
99 | ||
100 | if (s->forward_to_console || s->server->forward_to_console) | |
101 | server_forward_console(s->server, priority, s->identifier, p, &s->ucred); | |
102 | ||
103 | IOVEC_SET_STRING(iovec[n++], "_TRANSPORT=stdout"); | |
104 | ||
105 | if (asprintf(&syslog_priority, "PRIORITY=%i", priority & LOG_PRIMASK) >= 0) | |
106 | IOVEC_SET_STRING(iovec[n++], syslog_priority); | |
107 | ||
108 | if (priority & LOG_FACMASK) | |
109 | if (asprintf(&syslog_facility, "SYSLOG_FACILITY=%i", LOG_FAC(priority)) >= 0) | |
110 | IOVEC_SET_STRING(iovec[n++], syslog_facility); | |
111 | ||
112 | if (s->identifier) { | |
113 | syslog_identifier = strappend("SYSLOG_IDENTIFIER=", s->identifier); | |
114 | if (syslog_identifier) | |
115 | IOVEC_SET_STRING(iovec[n++], syslog_identifier); | |
116 | } | |
117 | ||
118 | message = strappend("MESSAGE=", p); | |
119 | if (message) | |
120 | IOVEC_SET_STRING(iovec[n++], message); | |
121 | ||
122 | #ifdef HAVE_SELINUX | |
123 | if (s->security_context) { | |
124 | label = (char*) s->security_context; | |
125 | label_len = strlen((char*) s->security_context); | |
126 | } | |
127 | #endif | |
128 | ||
129 | server_dispatch_message(s->server, iovec, n, ELEMENTSOF(iovec), &s->ucred, NULL, label, label_len, s->unit_id, priority); | |
130 | ||
131 | free(message); | |
132 | free(syslog_priority); | |
133 | free(syslog_facility); | |
134 | free(syslog_identifier); | |
135 | ||
136 | return 0; | |
137 | } | |
138 | ||
139 | static int stdout_stream_line(StdoutStream *s, char *p) { | |
140 | int r; | |
141 | ||
142 | assert(s); | |
143 | assert(p); | |
144 | ||
145 | p = strstrip(p); | |
146 | ||
147 | switch (s->state) { | |
148 | ||
149 | case STDOUT_STREAM_IDENTIFIER: | |
150 | if (isempty(p)) | |
151 | s->identifier = NULL; | |
152 | else { | |
153 | s->identifier = strdup(p); | |
154 | if (!s->identifier) | |
155 | return log_oom(); | |
156 | } | |
157 | ||
158 | s->state = STDOUT_STREAM_UNIT_ID; | |
159 | return 0; | |
160 | ||
161 | case STDOUT_STREAM_UNIT_ID: | |
162 | if (s->ucred.uid == 0) { | |
163 | if (isempty(p)) | |
164 | s->unit_id = NULL; | |
165 | else { | |
166 | s->unit_id = strdup(p); | |
167 | if (!s->unit_id) | |
168 | return log_oom(); | |
169 | } | |
170 | } | |
171 | ||
172 | s->state = STDOUT_STREAM_PRIORITY; | |
173 | return 0; | |
174 | ||
175 | case STDOUT_STREAM_PRIORITY: | |
176 | r = safe_atoi(p, &s->priority); | |
177 | if (r < 0 || s->priority <= 0 || s->priority >= 999) { | |
178 | log_warning("Failed to parse log priority line."); | |
179 | return -EINVAL; | |
180 | } | |
181 | ||
182 | s->state = STDOUT_STREAM_LEVEL_PREFIX; | |
183 | return 0; | |
184 | ||
185 | case STDOUT_STREAM_LEVEL_PREFIX: | |
186 | r = parse_boolean(p); | |
187 | if (r < 0) { | |
188 | log_warning("Failed to parse level prefix line."); | |
189 | return -EINVAL; | |
190 | } | |
191 | ||
192 | s->level_prefix = !!r; | |
193 | s->state = STDOUT_STREAM_FORWARD_TO_SYSLOG; | |
194 | return 0; | |
195 | ||
196 | case STDOUT_STREAM_FORWARD_TO_SYSLOG: | |
197 | r = parse_boolean(p); | |
198 | if (r < 0) { | |
199 | log_warning("Failed to parse forward to syslog line."); | |
200 | return -EINVAL; | |
201 | } | |
202 | ||
203 | s->forward_to_syslog = !!r; | |
204 | s->state = STDOUT_STREAM_FORWARD_TO_KMSG; | |
205 | return 0; | |
206 | ||
207 | case STDOUT_STREAM_FORWARD_TO_KMSG: | |
208 | r = parse_boolean(p); | |
209 | if (r < 0) { | |
210 | log_warning("Failed to parse copy to kmsg line."); | |
211 | return -EINVAL; | |
212 | } | |
213 | ||
214 | s->forward_to_kmsg = !!r; | |
215 | s->state = STDOUT_STREAM_FORWARD_TO_CONSOLE; | |
216 | return 0; | |
217 | ||
218 | case STDOUT_STREAM_FORWARD_TO_CONSOLE: | |
219 | r = parse_boolean(p); | |
220 | if (r < 0) { | |
221 | log_warning("Failed to parse copy to console line."); | |
222 | return -EINVAL; | |
223 | } | |
224 | ||
225 | s->forward_to_console = !!r; | |
226 | s->state = STDOUT_STREAM_RUNNING; | |
227 | return 0; | |
228 | ||
229 | case STDOUT_STREAM_RUNNING: | |
230 | return stdout_stream_log(s, p); | |
231 | } | |
232 | ||
233 | assert_not_reached("Unknown stream state"); | |
234 | } | |
235 | ||
236 | static int stdout_stream_scan(StdoutStream *s, bool force_flush) { | |
237 | char *p; | |
238 | size_t remaining; | |
239 | int r; | |
240 | ||
241 | assert(s); | |
242 | ||
243 | p = s->buffer; | |
244 | remaining = s->length; | |
245 | for (;;) { | |
246 | char *end; | |
247 | size_t skip; | |
248 | ||
249 | end = memchr(p, '\n', remaining); | |
250 | if (end) | |
251 | skip = end - p + 1; | |
252 | else if (remaining >= sizeof(s->buffer) - 1) { | |
253 | end = p + sizeof(s->buffer) - 1; | |
254 | skip = remaining; | |
255 | } else | |
256 | break; | |
257 | ||
258 | *end = 0; | |
259 | ||
260 | r = stdout_stream_line(s, p); | |
261 | if (r < 0) | |
262 | return r; | |
263 | ||
264 | remaining -= skip; | |
265 | p += skip; | |
266 | } | |
267 | ||
268 | if (force_flush && remaining > 0) { | |
269 | p[remaining] = 0; | |
270 | r = stdout_stream_line(s, p); | |
271 | if (r < 0) | |
272 | return r; | |
273 | ||
274 | p += remaining; | |
275 | remaining = 0; | |
276 | } | |
277 | ||
278 | if (p > s->buffer) { | |
279 | memmove(s->buffer, p, remaining); | |
280 | s->length = remaining; | |
281 | } | |
282 | ||
283 | return 0; | |
284 | } | |
285 | ||
286 | int stdout_stream_process(StdoutStream *s) { | |
287 | ssize_t l; | |
288 | int r; | |
289 | ||
290 | assert(s); | |
291 | ||
292 | l = read(s->fd, s->buffer+s->length, sizeof(s->buffer)-1-s->length); | |
293 | if (l < 0) { | |
294 | ||
295 | if (errno == EAGAIN) | |
296 | return 0; | |
297 | ||
298 | log_warning("Failed to read from stream: %m"); | |
299 | return -errno; | |
300 | } | |
301 | ||
302 | if (l == 0) { | |
303 | r = stdout_stream_scan(s, true); | |
304 | if (r < 0) | |
305 | return r; | |
306 | ||
307 | return 0; | |
308 | } | |
309 | ||
310 | s->length += l; | |
311 | r = stdout_stream_scan(s, false); | |
312 | if (r < 0) | |
313 | return r; | |
314 | ||
315 | return 1; | |
316 | ||
317 | } | |
318 | ||
319 | void stdout_stream_free(StdoutStream *s) { | |
320 | assert(s); | |
321 | ||
322 | if (s->server) { | |
323 | assert(s->server->n_stdout_streams > 0); | |
324 | s->server->n_stdout_streams --; | |
325 | LIST_REMOVE(StdoutStream, stdout_stream, s->server->stdout_streams, s); | |
326 | } | |
327 | ||
328 | if (s->fd >= 0) { | |
329 | if (s->server) | |
330 | epoll_ctl(s->server->epoll_fd, EPOLL_CTL_DEL, s->fd, NULL); | |
331 | ||
332 | close_nointr_nofail(s->fd); | |
333 | } | |
334 | ||
335 | #ifdef HAVE_SELINUX | |
336 | if (s->security_context) | |
337 | freecon(s->security_context); | |
338 | #endif | |
339 | ||
340 | free(s->identifier); | |
341 | free(s); | |
342 | } | |
343 | ||
344 | int stdout_stream_new(Server *s) { | |
345 | StdoutStream *stream; | |
346 | int fd, r; | |
347 | socklen_t len; | |
348 | struct epoll_event ev; | |
349 | ||
350 | assert(s); | |
351 | ||
352 | fd = accept4(s->stdout_fd, NULL, NULL, SOCK_NONBLOCK|SOCK_CLOEXEC); | |
353 | if (fd < 0) { | |
354 | if (errno == EAGAIN) | |
355 | return 0; | |
356 | ||
357 | log_error("Failed to accept stdout connection: %m"); | |
358 | return -errno; | |
359 | } | |
360 | ||
361 | if (s->n_stdout_streams >= STDOUT_STREAMS_MAX) { | |
362 | log_warning("Too many stdout streams, refusing connection."); | |
363 | close_nointr_nofail(fd); | |
364 | return 0; | |
365 | } | |
366 | ||
367 | stream = new0(StdoutStream, 1); | |
368 | if (!stream) { | |
369 | close_nointr_nofail(fd); | |
370 | return log_oom(); | |
371 | } | |
372 | ||
373 | stream->fd = fd; | |
374 | ||
375 | len = sizeof(stream->ucred); | |
376 | if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &stream->ucred, &len) < 0) { | |
377 | log_error("Failed to determine peer credentials: %m"); | |
378 | r = -errno; | |
379 | goto fail; | |
380 | } | |
381 | ||
382 | #ifdef HAVE_SELINUX | |
383 | if (getpeercon(fd, &stream->security_context) < 0 && errno != ENOPROTOOPT) | |
384 | log_error("Failed to determine peer security context: %m"); | |
385 | #endif | |
386 | ||
387 | if (shutdown(fd, SHUT_WR) < 0) { | |
388 | log_error("Failed to shutdown writing side of socket: %m"); | |
389 | r = -errno; | |
390 | goto fail; | |
391 | } | |
392 | ||
393 | zero(ev); | |
394 | ev.data.ptr = stream; | |
395 | ev.events = EPOLLIN; | |
396 | if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0) { | |
397 | log_error("Failed to add stream to event loop: %m"); | |
398 | r = -errno; | |
399 | goto fail; | |
400 | } | |
401 | ||
402 | stream->server = s; | |
403 | LIST_PREPEND(StdoutStream, stdout_stream, s->stdout_streams, stream); | |
404 | s->n_stdout_streams ++; | |
405 | ||
406 | return 0; | |
407 | ||
408 | fail: | |
409 | stdout_stream_free(stream); | |
410 | return r; | |
411 | } | |
412 | ||
413 | int server_open_stdout_socket(Server *s) { | |
414 | union sockaddr_union sa; | |
415 | int r; | |
416 | struct epoll_event ev; | |
417 | ||
418 | assert(s); | |
419 | ||
420 | if (s->stdout_fd < 0) { | |
421 | ||
422 | s->stdout_fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); | |
423 | if (s->stdout_fd < 0) { | |
424 | log_error("socket() failed: %m"); | |
425 | return -errno; | |
426 | } | |
427 | ||
428 | zero(sa); | |
429 | sa.un.sun_family = AF_UNIX; | |
430 | strncpy(sa.un.sun_path, "/run/systemd/journal/stdout", sizeof(sa.un.sun_path)); | |
431 | ||
432 | unlink(sa.un.sun_path); | |
433 | ||
434 | r = bind(s->stdout_fd, &sa.sa, offsetof(union sockaddr_union, un.sun_path) + strlen(sa.un.sun_path)); | |
435 | if (r < 0) { | |
436 | log_error("bind() failed: %m"); | |
437 | return -errno; | |
438 | } | |
439 | ||
440 | chmod(sa.un.sun_path, 0666); | |
441 | ||
442 | if (listen(s->stdout_fd, SOMAXCONN) < 0) { | |
443 | log_error("liste() failed: %m"); | |
444 | return -errno; | |
445 | } | |
446 | } else | |
447 | fd_nonblock(s->stdout_fd, 1); | |
448 | ||
449 | zero(ev); | |
450 | ev.events = EPOLLIN; | |
451 | ev.data.fd = s->stdout_fd; | |
452 | if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->stdout_fd, &ev) < 0) { | |
453 | log_error("Failed to add stdout server fd to epoll object: %m"); | |
454 | return -errno; | |
455 | } | |
456 | ||
457 | return 0; | |
458 | } |