1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
2
3 #include <stddef.h>
4 #include <unistd.h>
5
6 #if HAVE_SELINUX
7 #include <selinux/selinux.h>
8 #endif
9
10 #include "sd-daemon.h"
11 #include "sd-event.h"
12
13 #include "alloc-util.h"
14 #include "dirent-util.h"
15 #include "env-file.h"
16 #include "errno-util.h"
17 #include "escape.h"
18 #include "fd-util.h"
19 #include "fileio.h"
20 #include "fs-util.h"
21 #include "io-util.h"
22 #include "journald-console.h"
23 #include "journald-context.h"
24 #include "journald-kmsg.h"
25 #include "journald-server.h"
26 #include "journald-stream.h"
27 #include "journald-syslog.h"
28 #include "journald-wall.h"
29 #include "mkdir.h"
30 #include "parse-util.h"
31 #include "process-util.h"
32 #include "selinux-util.h"
33 #include "socket-util.h"
34 #include "stdio-util.h"
35 #include "string-util.h"
36 #include "syslog-util.h"
37 #include "tmpfile-util.h"
38 #include "unit-name.h"
39 #include "user-util.h"
40
41 #define STDOUT_STREAMS_MAX 4096
42
43 /* During the "setup" protocol phase of the stream logic let's define a different maximum line length than
44 * during the actual operational phase. We want to allow users to specify very short line lengths after all,
45 * but the unit name we embed in the setup protocol might be longer than that. Hence, during the setup phase
46 * let's enforce a line length matching the maximum unit name length (255) */
47 #define STDOUT_STREAM_SETUP_PROTOCOL_LINE_MAX (UNIT_NAME_MAX-1U)
48
49 typedef enum StdoutStreamState {
50 STDOUT_STREAM_IDENTIFIER,
51 STDOUT_STREAM_UNIT_ID,
52 STDOUT_STREAM_PRIORITY,
53 STDOUT_STREAM_LEVEL_PREFIX,
54 STDOUT_STREAM_FORWARD_TO_SYSLOG,
55 STDOUT_STREAM_FORWARD_TO_KMSG,
56 STDOUT_STREAM_FORWARD_TO_CONSOLE,
57 STDOUT_STREAM_RUNNING,
58 } StdoutStreamState;
59
60 /* The different types of log record terminators: a real \n was read, a NUL character was read, the maximum line length
61 * was reached, or the end of the stream was reached */
62
63 typedef enum LineBreak {
64 LINE_BREAK_NEWLINE,
65 LINE_BREAK_NUL,
66 LINE_BREAK_LINE_MAX,
67 LINE_BREAK_EOF,
68 LINE_BREAK_PID_CHANGE,
69 _LINE_BREAK_MAX,
70 _LINE_BREAK_INVALID = -EINVAL,
71 } LineBreak;
72
73 struct StdoutStream {
74 Server *server;
75 StdoutStreamState state;
76
77 int fd;
78
79 struct ucred ucred;
80 char *label;
81 char *identifier;
82 char *unit_id;
83 int priority;
84 bool level_prefix:1;
85 bool forward_to_syslog:1;
86 bool forward_to_kmsg:1;
87 bool forward_to_console:1;
88
89 bool fdstore:1;
90 bool in_notify_queue:1;
91
92 char *buffer;
93 size_t length;
94
95 sd_event_source *event_source;
96
97 char *state_file;
98
99 ClientContext *context;
100
101 LIST_FIELDS(StdoutStream, stdout_stream);
102 LIST_FIELDS(StdoutStream, stdout_stream_notify_queue);
103
104 char id_field[STRLEN("_STREAM_ID=") + SD_ID128_STRING_MAX];
105 };
106
stdout_stream_free(StdoutStream * s)107 StdoutStream* stdout_stream_free(StdoutStream *s) {
108 if (!s)
109 return NULL;
110
111 if (s->server) {
112 if (s->context)
113 client_context_release(s->server, s->context);
114
115 assert(s->server->n_stdout_streams > 0);
116 s->server->n_stdout_streams--;
117 LIST_REMOVE(stdout_stream, s->server->stdout_streams, s);
118
119 if (s->in_notify_queue)
120 LIST_REMOVE(stdout_stream_notify_queue, s->server->stdout_streams_notify_queue, s);
121
122 (void) server_start_or_stop_idle_timer(s->server); /* Maybe we are idle now? */
123 }
124
125 sd_event_source_disable_unref(s->event_source);
126 safe_close(s->fd);
127 free(s->label);
128 free(s->identifier);
129 free(s->unit_id);
130 free(s->state_file);
131 free(s->buffer);
132
133 return mfree(s);
134 }
135
136 DEFINE_TRIVIAL_CLEANUP_FUNC(StdoutStream*, stdout_stream_free);
137
stdout_stream_destroy(StdoutStream * s)138 void stdout_stream_destroy(StdoutStream *s) {
139 if (!s)
140 return;
141
142 if (s->state_file)
143 (void) unlink(s->state_file);
144
145 stdout_stream_free(s);
146 }
147
stdout_stream_save(StdoutStream * s)148 static int stdout_stream_save(StdoutStream *s) {
149 _cleanup_(unlink_and_freep) char *temp_path = NULL;
150 _cleanup_fclose_ FILE *f = NULL;
151 int r;
152
153 assert(s);
154
155 if (s->state != STDOUT_STREAM_RUNNING)
156 return 0;
157
158 if (!s->state_file) {
159 struct stat st;
160
161 r = fstat(s->fd, &st);
162 if (r < 0)
163 return log_warning_errno(errno, "Failed to stat connected stream: %m");
164
165 /* We use device and inode numbers as identifier for the stream */
166 r = asprintf(&s->state_file, "%s/streams/%lu:%lu", s->server->runtime_directory, (unsigned long) st.st_dev, (unsigned long) st.st_ino);
167 if (r < 0)
168 return log_oom();
169 }
170
171 (void) mkdir_parents(s->state_file, 0755);
172
173 r = fopen_temporary(s->state_file, &f, &temp_path);
174 if (r < 0)
175 goto fail;
176
177 fprintf(f,
178 "# This is private data. Do not parse\n"
179 "PRIORITY=%i\n"
180 "LEVEL_PREFIX=%i\n"
181 "FORWARD_TO_SYSLOG=%i\n"
182 "FORWARD_TO_KMSG=%i\n"
183 "FORWARD_TO_CONSOLE=%i\n"
184 "STREAM_ID=%s\n",
185 s->priority,
186 s->level_prefix,
187 s->forward_to_syslog,
188 s->forward_to_kmsg,
189 s->forward_to_console,
190 s->id_field + STRLEN("_STREAM_ID="));
191
192 if (!isempty(s->identifier)) {
193 _cleanup_free_ char *escaped = NULL;
194
195 escaped = cescape(s->identifier);
196 if (!escaped) {
197 r = -ENOMEM;
198 goto fail;
199 }
200
201 fprintf(f, "IDENTIFIER=%s\n", escaped);
202 }
203
204 if (!isempty(s->unit_id)) {
205 _cleanup_free_ char *escaped = NULL;
206
207 escaped = cescape(s->unit_id);
208 if (!escaped) {
209 r = -ENOMEM;
210 goto fail;
211 }
212
213 fprintf(f, "UNIT=%s\n", escaped);
214 }
215
216 r = fflush_and_check(f);
217 if (r < 0)
218 goto fail;
219
220 if (rename(temp_path, s->state_file) < 0) {
221 r = -errno;
222 goto fail;
223 }
224
225 temp_path = mfree(temp_path);
226
227 if (!s->fdstore && !s->in_notify_queue) {
228 LIST_PREPEND(stdout_stream_notify_queue, s->server->stdout_streams_notify_queue, s);
229 s->in_notify_queue = true;
230
231 if (s->server->notify_event_source) {
232 r = sd_event_source_set_enabled(s->server->notify_event_source, SD_EVENT_ON);
233 if (r < 0)
234 log_warning_errno(r, "Failed to enable notify event source: %m");
235 }
236 }
237
238 return 0;
239
240 fail:
241 (void) unlink(s->state_file);
242 return log_error_errno(r, "Failed to save stream data %s: %m", s->state_file);
243 }
244
stdout_stream_log(StdoutStream * s,const char * p,LineBreak line_break)245 static int stdout_stream_log(
246 StdoutStream *s,
247 const char *p,
248 LineBreak line_break) {
249
250 struct iovec *iovec;
251 int priority;
252 char syslog_priority[] = "PRIORITY=\0";
253 char syslog_facility[STRLEN("SYSLOG_FACILITY=") + DECIMAL_STR_MAX(int) + 1];
254 _cleanup_free_ char *message = NULL, *syslog_identifier = NULL;
255 size_t n = 0, m;
256 int r;
257
258 assert(s);
259 assert(p);
260
261 assert(line_break >= 0);
262 assert(line_break < _LINE_BREAK_MAX);
263
264 if (s->context)
265 (void) client_context_maybe_refresh(s->server, s->context, NULL, NULL, 0, NULL, USEC_INFINITY);
266 else if (pid_is_valid(s->ucred.pid)) {
267 r = client_context_acquire(s->server, s->ucred.pid, &s->ucred, s->label, strlen_ptr(s->label), s->unit_id, &s->context);
268 if (r < 0)
269 log_warning_errno(r, "Failed to acquire client context, ignoring: %m");
270 }
271
272 priority = s->priority;
273
274 if (s->level_prefix)
275 syslog_parse_priority(&p, &priority, false);
276
277 if (!client_context_test_priority(s->context, priority))
278 return 0;
279
280 if (isempty(p))
281 return 0;
282
283 if (s->forward_to_syslog || s->server->forward_to_syslog)
284 server_forward_syslog(s->server, syslog_fixup_facility(priority), s->identifier, p, &s->ucred, NULL);
285
286 if (s->forward_to_kmsg || s->server->forward_to_kmsg)
287 server_forward_kmsg(s->server, priority, s->identifier, p, &s->ucred);
288
289 if (s->forward_to_console || s->server->forward_to_console)
290 server_forward_console(s->server, priority, s->identifier, p, &s->ucred);
291
292 if (s->server->forward_to_wall)
293 server_forward_wall(s->server, priority, s->identifier, p, &s->ucred);
294
295 m = N_IOVEC_META_FIELDS + 7 + client_context_extra_fields_n_iovec(s->context);
296 iovec = newa(struct iovec, m);
297
298 iovec[n++] = IOVEC_MAKE_STRING("_TRANSPORT=stdout");
299 iovec[n++] = IOVEC_MAKE_STRING(s->id_field);
300
301 syslog_priority[STRLEN("PRIORITY=")] = '0' + LOG_PRI(priority);
302 iovec[n++] = IOVEC_MAKE_STRING(syslog_priority);
303
304 if (priority & LOG_FACMASK) {
305 xsprintf(syslog_facility, "SYSLOG_FACILITY=%i", LOG_FAC(priority));
306 iovec[n++] = IOVEC_MAKE_STRING(syslog_facility);
307 }
308
309 if (s->identifier) {
310 syslog_identifier = strjoin("SYSLOG_IDENTIFIER=", s->identifier);
311 if (syslog_identifier)
312 iovec[n++] = IOVEC_MAKE_STRING(syslog_identifier);
313 }
314
315 static const char * const line_break_field_table[_LINE_BREAK_MAX] = {
316 [LINE_BREAK_NEWLINE] = NULL, /* Do not add field if traditional newline */
317 [LINE_BREAK_NUL] = "_LINE_BREAK=nul",
318 [LINE_BREAK_LINE_MAX] = "_LINE_BREAK=line-max",
319 [LINE_BREAK_EOF] = "_LINE_BREAK=eof",
320 [LINE_BREAK_PID_CHANGE] = "_LINE_BREAK=pid-change",
321 };
322
323 const char *c = line_break_field_table[line_break];
324
325 /* If this log message was generated due to an uncommon line break then mention this in the log
326 * entry */
327 if (c)
328 iovec[n++] = IOVEC_MAKE_STRING(c);
329
330 message = strjoin("MESSAGE=", p);
331 if (message)
332 iovec[n++] = IOVEC_MAKE_STRING(message);
333
334 server_dispatch_message(s->server, iovec, n, m, s->context, NULL, priority, 0);
335 return 0;
336 }
337
syslog_parse_priority_and_facility(const char * s)338 static int syslog_parse_priority_and_facility(const char *s) {
339 int prio, r;
340
341 /* Parses both facility and priority in one value, i.e. is different from log_level_from_string()
342 * which only parses the priority and refuses any facility value */
343
344 r = safe_atoi(s, &prio);
345 if (r < 0)
346 return r;
347
348 if (prio < 0 || prio > 999)
349 return -ERANGE;
350
351 return prio;
352 }
353
stdout_stream_line(StdoutStream * s,char * p,LineBreak line_break)354 static int stdout_stream_line(StdoutStream *s, char *p, LineBreak line_break) {
355 char *orig;
356 int r;
357
358 assert(s);
359 assert(p);
360
361 orig = p;
362 p = strstrip(p);
363
364 /* line breaks by NUL, line max length or EOF are not permissible during the negotiation part of the protocol */
365 if (line_break != LINE_BREAK_NEWLINE && s->state != STDOUT_STREAM_RUNNING)
366 return log_warning_errno(SYNTHETIC_ERRNO(EINVAL),
367 "Control protocol line not properly terminated.");
368
369 switch (s->state) {
370
371 case STDOUT_STREAM_IDENTIFIER:
372 if (!isempty(p)) {
373 s->identifier = strdup(p);
374 if (!s->identifier)
375 return log_oom();
376 }
377
378 s->state = STDOUT_STREAM_UNIT_ID;
379 return 0;
380
381 case STDOUT_STREAM_UNIT_ID:
382 if (s->ucred.uid == 0 &&
383 unit_name_is_valid(p, UNIT_NAME_PLAIN|UNIT_NAME_INSTANCE)) {
384
385 s->unit_id = strdup(p);
386 if (!s->unit_id)
387 return log_oom();
388 }
389
390 s->state = STDOUT_STREAM_PRIORITY;
391 return 0;
392
393 case STDOUT_STREAM_PRIORITY: {
394 int priority;
395
396 priority = syslog_parse_priority_and_facility(p);
397 if (priority < 0)
398 return log_warning_errno(priority, "Failed to parse log priority line: %m");
399
400 s->priority = priority;
401 s->state = STDOUT_STREAM_LEVEL_PREFIX;
402 return 0;
403 }
404
405 case STDOUT_STREAM_LEVEL_PREFIX:
406 r = parse_boolean(p);
407 if (r < 0)
408 return log_warning_errno(r, "Failed to parse level prefix line: %m");
409
410 s->level_prefix = r;
411 s->state = STDOUT_STREAM_FORWARD_TO_SYSLOG;
412 return 0;
413
414 case STDOUT_STREAM_FORWARD_TO_SYSLOG:
415 r = parse_boolean(p);
416 if (r < 0)
417 return log_warning_errno(r, "Failed to parse forward to syslog line: %m");
418
419 s->forward_to_syslog = r;
420 s->state = STDOUT_STREAM_FORWARD_TO_KMSG;
421 return 0;
422
423 case STDOUT_STREAM_FORWARD_TO_KMSG:
424 r = parse_boolean(p);
425 if (r < 0)
426 return log_warning_errno(r, "Failed to parse copy to kmsg line: %m");
427
428 s->forward_to_kmsg = r;
429 s->state = STDOUT_STREAM_FORWARD_TO_CONSOLE;
430 return 0;
431
432 case STDOUT_STREAM_FORWARD_TO_CONSOLE:
433 r = parse_boolean(p);
434 if (r < 0)
435 return log_warning_errno(r, "Failed to parse copy to console line.");
436
437 s->forward_to_console = r;
438 s->state = STDOUT_STREAM_RUNNING;
439
440 /* Try to save the stream, so that journald can be restarted and we can recover */
441 (void) stdout_stream_save(s);
442 return 0;
443
444 case STDOUT_STREAM_RUNNING:
445 return stdout_stream_log(s, orig, line_break);
446 }
447
448 assert_not_reached();
449 }
450
stdout_stream_found(StdoutStream * s,char * p,size_t l,LineBreak line_break)451 static int stdout_stream_found(
452 StdoutStream *s,
453 char *p,
454 size_t l,
455 LineBreak line_break) {
456
457 char saved;
458 int r;
459
460 assert(s);
461 assert(p);
462
463 /* Let's NUL terminate the specified buffer for this call, and revert back afterwards */
464 saved = p[l];
465 p[l] = 0;
466 r = stdout_stream_line(s, p, line_break);
467 p[l] = saved;
468
469 return r;
470 }
471
stdout_stream_line_max(StdoutStream * s)472 static size_t stdout_stream_line_max(StdoutStream *s) {
473 assert(s);
474
475 /* During the "setup" phase of our protocol, let's ensure we use a line length where a full unit name
476 * can fit in */
477 if (s->state != STDOUT_STREAM_RUNNING)
478 return STDOUT_STREAM_SETUP_PROTOCOL_LINE_MAX;
479
480 /* After the protocol's "setup" phase is complete, let's use whatever the user configured */
481 return s->server->line_max;
482 }
483
stdout_stream_scan(StdoutStream * s,char * p,size_t remaining,LineBreak force_flush,size_t * ret_consumed)484 static int stdout_stream_scan(
485 StdoutStream *s,
486 char *p,
487 size_t remaining,
488 LineBreak force_flush,
489 size_t *ret_consumed) {
490
491 size_t consumed = 0, line_max;
492 int r;
493
494 assert(s);
495 assert(p);
496
497 line_max = stdout_stream_line_max(s);
498
499 for (;;) {
500 LineBreak line_break;
501 size_t skip, found;
502 char *end1, *end2;
503 size_t tmp_remaining = MIN(remaining, line_max);
504
505 end1 = memchr(p, '\n', tmp_remaining);
506 end2 = memchr(p, 0, end1 ? (size_t) (end1 - p) : tmp_remaining);
507
508 if (end2) {
509 /* We found a NUL terminator */
510 found = end2 - p;
511 skip = found + 1;
512 line_break = LINE_BREAK_NUL;
513 } else if (end1) {
514 /* We found a \n terminator */
515 found = end1 - p;
516 skip = found + 1;
517 line_break = LINE_BREAK_NEWLINE;
518 } else if (remaining >= line_max) {
519 /* Force a line break after the maximum line length */
520 found = skip = line_max;
521 line_break = LINE_BREAK_LINE_MAX;
522 } else
523 break;
524
525 r = stdout_stream_found(s, p, found, line_break);
526 if (r < 0)
527 return r;
528
529 p += skip;
530 consumed += skip;
531 remaining -= skip;
532 }
533
534 if (force_flush >= 0 && remaining > 0) {
535 r = stdout_stream_found(s, p, remaining, force_flush);
536 if (r < 0)
537 return r;
538
539 consumed += remaining;
540 }
541
542 if (ret_consumed)
543 *ret_consumed = consumed;
544
545 return 0;
546 }
547
stdout_stream_process(sd_event_source * es,int fd,uint32_t revents,void * userdata)548 static int stdout_stream_process(sd_event_source *es, int fd, uint32_t revents, void *userdata) {
549 CMSG_BUFFER_TYPE(CMSG_SPACE(sizeof(struct ucred))) control;
550 size_t limit, consumed, allocated;
551 StdoutStream *s = userdata;
552 struct ucred *ucred;
553 struct iovec iovec;
554 ssize_t l;
555 char *p;
556 int r;
557
558 struct msghdr msghdr = {
559 .msg_iov = &iovec,
560 .msg_iovlen = 1,
561 .msg_control = &control,
562 .msg_controllen = sizeof(control),
563 };
564
565 assert(s);
566
567 if ((revents|EPOLLIN|EPOLLHUP) != (EPOLLIN|EPOLLHUP)) {
568 log_error("Got invalid event from epoll for stdout stream: %"PRIx32, revents);
569 goto terminate;
570 }
571
572 /* If the buffer is almost full, add room for another 1K */
573 allocated = MALLOC_ELEMENTSOF(s->buffer);
574 if (s->length + 512 >= allocated) {
575 if (!GREEDY_REALLOC(s->buffer, s->length + 1 + 1024)) {
576 log_oom();
577 goto terminate;
578 }
579
580 allocated = MALLOC_ELEMENTSOF(s->buffer);
581 }
582
583 /* Try to make use of the allocated buffer in full, but never read more than the configured line size. Also,
584 * always leave room for a terminating NUL we might need to add. */
585 limit = MIN(allocated - 1, MAX(s->server->line_max, STDOUT_STREAM_SETUP_PROTOCOL_LINE_MAX));
586 assert(s->length <= limit);
587 iovec = IOVEC_MAKE(s->buffer + s->length, limit - s->length);
588
589 l = recvmsg(s->fd, &msghdr, MSG_DONTWAIT|MSG_CMSG_CLOEXEC);
590 if (l < 0) {
591 if (ERRNO_IS_TRANSIENT(errno))
592 return 0;
593
594 log_warning_errno(errno, "Failed to read from stream: %m");
595 goto terminate;
596 }
597 cmsg_close_all(&msghdr);
598
599 if (l == 0) {
600 (void) stdout_stream_scan(s, s->buffer, s->length, /* force_flush = */ LINE_BREAK_EOF, NULL);
601 goto terminate;
602 }
603
604 /* Invalidate the context if the PID of the sender changed. This happens when a forked process
605 * inherits stdout/stderr from a parent. In this case getpeercred() returns the ucred of the parent,
606 * which can be invalid if the parent has exited in the meantime. */
607 ucred = CMSG_FIND_DATA(&msghdr, SOL_SOCKET, SCM_CREDENTIALS, struct ucred);
608 if (ucred && ucred->pid != s->ucred.pid) {
609 /* Force out any previously half-written lines from a different process, before we switch to
610 * the new ucred structure for everything we just added */
611 r = stdout_stream_scan(s, s->buffer, s->length, /* force_flush = */ LINE_BREAK_PID_CHANGE, NULL);
612 if (r < 0)
613 goto terminate;
614
615 s->context = client_context_release(s->server, s->context);
616
617 p = s->buffer + s->length;
618 } else {
619 p = s->buffer;
620 l += s->length;
621 }
622
623 /* Always copy in the new credentials */
624 if (ucred)
625 s->ucred = *ucred;
626
627 r = stdout_stream_scan(s, p, l, _LINE_BREAK_INVALID, &consumed);
628 if (r < 0)
629 goto terminate;
630
631 /* Move what wasn't consumed to the front of the buffer */
632 assert(consumed <= (size_t) l);
633 s->length = l - consumed;
634 memmove(s->buffer, p + consumed, s->length);
635
636 return 1;
637
638 terminate:
639 stdout_stream_destroy(s);
640 return 0;
641 }
642
stdout_stream_install(Server * s,int fd,StdoutStream ** ret)643 int stdout_stream_install(Server *s, int fd, StdoutStream **ret) {
644 _cleanup_(stdout_stream_freep) StdoutStream *stream = NULL;
645 sd_id128_t id;
646 int r;
647
648 assert(s);
649 assert(fd >= 0);
650
651 r = sd_id128_randomize(&id);
652 if (r < 0)
653 return log_error_errno(r, "Failed to generate stream ID: %m");
654
655 stream = new(StdoutStream, 1);
656 if (!stream)
657 return log_oom();
658
659 *stream = (StdoutStream) {
660 .fd = -1,
661 .priority = LOG_INFO,
662 .ucred = UCRED_INVALID,
663 };
664
665 xsprintf(stream->id_field, "_STREAM_ID=" SD_ID128_FORMAT_STR, SD_ID128_FORMAT_VAL(id));
666
667 r = getpeercred(fd, &stream->ucred);
668 if (r < 0)
669 return log_error_errno(r, "Failed to determine peer credentials: %m");
670
671 r = setsockopt_int(fd, SOL_SOCKET, SO_PASSCRED, true);
672 if (r < 0)
673 return log_error_errno(r, "SO_PASSCRED failed: %m");
674
675 if (mac_selinux_use()) {
676 r = getpeersec(fd, &stream->label);
677 if (r < 0 && r != -EOPNOTSUPP)
678 (void) log_warning_errno(r, "Failed to determine peer security context: %m");
679 }
680
681 (void) shutdown(fd, SHUT_WR);
682
683 r = sd_event_add_io(s->event, &stream->event_source, fd, EPOLLIN, stdout_stream_process, stream);
684 if (r < 0)
685 return log_error_errno(r, "Failed to add stream to event loop: %m");
686
687 r = sd_event_source_set_priority(stream->event_source, SD_EVENT_PRIORITY_NORMAL+5);
688 if (r < 0)
689 return log_error_errno(r, "Failed to adjust stdout event source priority: %m");
690
691 stream->fd = fd;
692
693 stream->server = s;
694 LIST_PREPEND(stdout_stream, s->stdout_streams, stream);
695 s->n_stdout_streams++;
696
697 (void) server_start_or_stop_idle_timer(s); /* Maybe no longer idle? */
698
699 if (ret)
700 *ret = stream;
701
702 TAKE_PTR(stream);
703 return 0;
704 }
705
stdout_stream_new(sd_event_source * es,int listen_fd,uint32_t revents,void * userdata)706 static int stdout_stream_new(sd_event_source *es, int listen_fd, uint32_t revents, void *userdata) {
707 _cleanup_close_ int fd = -1;
708 Server *s = userdata;
709 int r;
710
711 assert(s);
712
713 if (revents != EPOLLIN)
714 return log_error_errno(SYNTHETIC_ERRNO(EIO),
715 "Got invalid event from epoll for stdout server fd: %" PRIx32,
716 revents);
717
718 fd = accept4(s->stdout_fd, NULL, NULL, SOCK_NONBLOCK|SOCK_CLOEXEC);
719 if (fd < 0) {
720 if (ERRNO_IS_ACCEPT_AGAIN(errno))
721 return 0;
722
723 return log_error_errno(errno, "Failed to accept stdout connection: %m");
724 }
725
726 if (s->n_stdout_streams >= STDOUT_STREAMS_MAX) {
727 struct ucred u = UCRED_INVALID;
728
729 (void) getpeercred(fd, &u);
730
731 /* By closing fd here we make sure that the client won't wait too long for journald to
732 * gather all the data it adds to the error message to find out that the connection has
733 * just been refused.
734 */
735 fd = safe_close(fd);
736
737 server_driver_message(s, u.pid, NULL, LOG_MESSAGE("Too many stdout streams, refusing connection."), NULL);
738 return 0;
739 }
740
741 r = stdout_stream_install(s, fd, NULL);
742 if (r < 0)
743 return r;
744
745 TAKE_FD(fd);
746 return 0;
747 }
748
stdout_stream_load(StdoutStream * stream,const char * fname)749 static int stdout_stream_load(StdoutStream *stream, const char *fname) {
750 _cleanup_free_ char
751 *priority = NULL,
752 *level_prefix = NULL,
753 *forward_to_syslog = NULL,
754 *forward_to_kmsg = NULL,
755 *forward_to_console = NULL,
756 *stream_id = NULL;
757 int r;
758
759 assert(stream);
760 assert(fname);
761
762 if (!stream->state_file) {
763 stream->state_file = path_join(stream->server->runtime_directory, "streams", fname);
764 if (!stream->state_file)
765 return log_oom();
766 }
767
768 r = parse_env_file(NULL, stream->state_file,
769 "PRIORITY", &priority,
770 "LEVEL_PREFIX", &level_prefix,
771 "FORWARD_TO_SYSLOG", &forward_to_syslog,
772 "FORWARD_TO_KMSG", &forward_to_kmsg,
773 "FORWARD_TO_CONSOLE", &forward_to_console,
774 "IDENTIFIER", &stream->identifier,
775 "UNIT", &stream->unit_id,
776 "STREAM_ID", &stream_id);
777 if (r < 0)
778 return log_error_errno(r, "Failed to read: %s", stream->state_file);
779
780 if (priority) {
781 int p;
782
783 p = syslog_parse_priority_and_facility(priority);
784 if (p >= 0)
785 stream->priority = p;
786 }
787
788 if (level_prefix) {
789 r = parse_boolean(level_prefix);
790 if (r >= 0)
791 stream->level_prefix = r;
792 }
793
794 if (forward_to_syslog) {
795 r = parse_boolean(forward_to_syslog);
796 if (r >= 0)
797 stream->forward_to_syslog = r;
798 }
799
800 if (forward_to_kmsg) {
801 r = parse_boolean(forward_to_kmsg);
802 if (r >= 0)
803 stream->forward_to_kmsg = r;
804 }
805
806 if (forward_to_console) {
807 r = parse_boolean(forward_to_console);
808 if (r >= 0)
809 stream->forward_to_console = r;
810 }
811
812 if (stream_id) {
813 sd_id128_t id;
814
815 r = sd_id128_from_string(stream_id, &id);
816 if (r >= 0)
817 xsprintf(stream->id_field, "_STREAM_ID=" SD_ID128_FORMAT_STR, SD_ID128_FORMAT_VAL(id));
818 }
819
820 return 0;
821 }
822
stdout_stream_restore(Server * s,const char * fname,int fd)823 static int stdout_stream_restore(Server *s, const char *fname, int fd) {
824 StdoutStream *stream;
825 int r;
826
827 assert(s);
828 assert(fname);
829 assert(fd >= 0);
830
831 if (s->n_stdout_streams >= STDOUT_STREAMS_MAX) {
832 log_warning("Too many stdout streams, refusing restoring of stream.");
833 return -ENOBUFS;
834 }
835
836 r = stdout_stream_install(s, fd, &stream);
837 if (r < 0)
838 return r;
839
840 stream->state = STDOUT_STREAM_RUNNING;
841 stream->fdstore = true;
842
843 /* Ignore all parsing errors */
844 (void) stdout_stream_load(stream, fname);
845
846 return 0;
847 }
848
server_restore_streams(Server * s,FDSet * fds)849 int server_restore_streams(Server *s, FDSet *fds) {
850 _cleanup_closedir_ DIR *d = NULL;
851 const char *path;
852 int r;
853
854 path = strjoina(s->runtime_directory, "/streams");
855 d = opendir(path);
856 if (!d) {
857 if (errno == ENOENT)
858 return 0;
859
860 return log_warning_errno(errno, "Failed to enumerate %s: %m", path);
861 }
862
863 FOREACH_DIRENT(de, d, goto fail) {
864 unsigned long st_dev, st_ino;
865 bool found = false;
866 int fd;
867
868 if (sscanf(de->d_name, "%lu:%lu", &st_dev, &st_ino) != 2)
869 continue;
870
871 FDSET_FOREACH(fd, fds) {
872 struct stat st;
873
874 if (fstat(fd, &st) < 0)
875 return log_error_errno(errno, "Failed to stat %s: %m", de->d_name);
876
877 if (S_ISSOCK(st.st_mode) && st.st_dev == st_dev && st.st_ino == st_ino) {
878 found = true;
879 break;
880 }
881 }
882
883 if (!found) {
884 /* No file descriptor? Then let's delete the state file */
885 log_debug("Cannot restore stream file %s", de->d_name);
886 if (unlinkat(dirfd(d), de->d_name, 0) < 0)
887 log_warning_errno(errno, "Failed to remove %s/%s: %m", path, de->d_name);
888 continue;
889 }
890
891 fdset_remove(fds, fd);
892
893 r = stdout_stream_restore(s, de->d_name, fd);
894 if (r < 0)
895 safe_close(fd);
896 }
897
898 return 0;
899
900 fail:
901 return log_error_errno(errno, "Failed to read streams directory: %m");
902 }
903
server_open_stdout_socket(Server * s,const char * stdout_socket)904 int server_open_stdout_socket(Server *s, const char *stdout_socket) {
905 int r;
906
907 assert(s);
908 assert(stdout_socket);
909
910 if (s->stdout_fd < 0) {
911 union sockaddr_union sa;
912 socklen_t sa_len;
913
914 r = sockaddr_un_set_path(&sa.un, stdout_socket);
915 if (r < 0)
916 return log_error_errno(r, "Unable to use namespace path %s for AF_UNIX socket: %m", stdout_socket);
917 sa_len = r;
918
919 s->stdout_fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
920 if (s->stdout_fd < 0)
921 return log_error_errno(errno, "socket() failed: %m");
922
923 (void) sockaddr_un_unlink(&sa.un);
924
925 r = bind(s->stdout_fd, &sa.sa, sa_len);
926 if (r < 0)
927 return log_error_errno(errno, "bind(%s) failed: %m", sa.un.sun_path);
928
929 (void) chmod(sa.un.sun_path, 0666);
930
931 if (listen(s->stdout_fd, SOMAXCONN) < 0)
932 return log_error_errno(errno, "listen(%s) failed: %m", sa.un.sun_path);
933 } else
934 (void) fd_nonblock(s->stdout_fd, true);
935
936 r = sd_event_add_io(s->event, &s->stdout_event_source, s->stdout_fd, EPOLLIN, stdout_stream_new, s);
937 if (r < 0)
938 return log_error_errno(r, "Failed to add stdout server fd to event source: %m");
939
940 r = sd_event_source_set_priority(s->stdout_event_source, SD_EVENT_PRIORITY_NORMAL+5);
941 if (r < 0)
942 return log_error_errno(r, "Failed to adjust priority of stdout server event source: %m");
943
944 return 0;
945 }
946
stdout_stream_send_notify(StdoutStream * s)947 void stdout_stream_send_notify(StdoutStream *s) {
948 struct iovec iovec = {
949 .iov_base = (char*) "FDSTORE=1",
950 .iov_len = STRLEN("FDSTORE=1"),
951 };
952 struct msghdr msghdr = {
953 .msg_iov = &iovec,
954 .msg_iovlen = 1,
955 };
956 struct cmsghdr *cmsg;
957 ssize_t l;
958
959 assert(s);
960 assert(!s->fdstore);
961 assert(s->in_notify_queue);
962 assert(s->server);
963 assert(s->server->notify_fd >= 0);
964
965 /* Store the connection fd in PID 1, so that we get it passed
966 * in again on next start */
967
968 msghdr.msg_controllen = CMSG_SPACE(sizeof(int));
969 msghdr.msg_control = alloca0(msghdr.msg_controllen);
970
971 cmsg = CMSG_FIRSTHDR(&msghdr);
972 cmsg->cmsg_level = SOL_SOCKET;
973 cmsg->cmsg_type = SCM_RIGHTS;
974 cmsg->cmsg_len = CMSG_LEN(sizeof(int));
975
976 memcpy(CMSG_DATA(cmsg), &s->fd, sizeof(int));
977
978 l = sendmsg(s->server->notify_fd, &msghdr, MSG_DONTWAIT|MSG_NOSIGNAL);
979 if (l < 0) {
980 if (errno == EAGAIN)
981 return;
982
983 log_error_errno(errno, "Failed to send stream file descriptor to service manager: %m");
984 } else {
985 log_debug("Successfully sent stream file descriptor to service manager.");
986 s->fdstore = 1;
987 }
988
989 LIST_REMOVE(stdout_stream_notify_queue, s->server->stdout_streams_notify_queue, s);
990 s->in_notify_queue = false;
991
992 }
993