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Merge pull request #11144 from keszybz/dissect-image-fix
[thirdparty/systemd.git] / src / core / service.c
1 /* SPDX-License-Identifier: LGPL-2.1+ */
2
3 #include <errno.h>
4 #include <signal.h>
5 #include <unistd.h>
6
7 #include "sd-messages.h"
8
9 #include "alloc-util.h"
10 #include "async.h"
11 #include "bus-error.h"
12 #include "bus-kernel.h"
13 #include "bus-util.h"
14 #include "dbus-service.h"
15 #include "dbus-unit.h"
16 #include "def.h"
17 #include "env-util.h"
18 #include "escape.h"
19 #include "exit-status.h"
20 #include "fd-util.h"
21 #include "fileio.h"
22 #include "format-util.h"
23 #include "fs-util.h"
24 #include "load-dropin.h"
25 #include "load-fragment.h"
26 #include "log.h"
27 #include "manager.h"
28 #include "parse-util.h"
29 #include "path-util.h"
30 #include "process-util.h"
31 #include "serialize.h"
32 #include "service.h"
33 #include "signal-util.h"
34 #include "special.h"
35 #include "stdio-util.h"
36 #include "string-table.h"
37 #include "string-util.h"
38 #include "strv.h"
39 #include "unit-name.h"
40 #include "unit.h"
41 #include "utf8.h"
42 #include "util.h"
43
44 static const UnitActiveState state_translation_table[_SERVICE_STATE_MAX] = {
45 [SERVICE_DEAD] = UNIT_INACTIVE,
46 [SERVICE_START_PRE] = UNIT_ACTIVATING,
47 [SERVICE_START] = UNIT_ACTIVATING,
48 [SERVICE_START_POST] = UNIT_ACTIVATING,
49 [SERVICE_RUNNING] = UNIT_ACTIVE,
50 [SERVICE_EXITED] = UNIT_ACTIVE,
51 [SERVICE_RELOAD] = UNIT_RELOADING,
52 [SERVICE_STOP] = UNIT_DEACTIVATING,
53 [SERVICE_STOP_WATCHDOG] = UNIT_DEACTIVATING,
54 [SERVICE_STOP_SIGTERM] = UNIT_DEACTIVATING,
55 [SERVICE_STOP_SIGKILL] = UNIT_DEACTIVATING,
56 [SERVICE_STOP_POST] = UNIT_DEACTIVATING,
57 [SERVICE_FINAL_SIGTERM] = UNIT_DEACTIVATING,
58 [SERVICE_FINAL_SIGKILL] = UNIT_DEACTIVATING,
59 [SERVICE_FAILED] = UNIT_FAILED,
60 [SERVICE_AUTO_RESTART] = UNIT_ACTIVATING
61 };
62
63 /* For Type=idle we never want to delay any other jobs, hence we
64 * consider idle jobs active as soon as we start working on them */
65 static const UnitActiveState state_translation_table_idle[_SERVICE_STATE_MAX] = {
66 [SERVICE_DEAD] = UNIT_INACTIVE,
67 [SERVICE_START_PRE] = UNIT_ACTIVE,
68 [SERVICE_START] = UNIT_ACTIVE,
69 [SERVICE_START_POST] = UNIT_ACTIVE,
70 [SERVICE_RUNNING] = UNIT_ACTIVE,
71 [SERVICE_EXITED] = UNIT_ACTIVE,
72 [SERVICE_RELOAD] = UNIT_RELOADING,
73 [SERVICE_STOP] = UNIT_DEACTIVATING,
74 [SERVICE_STOP_WATCHDOG] = UNIT_DEACTIVATING,
75 [SERVICE_STOP_SIGTERM] = UNIT_DEACTIVATING,
76 [SERVICE_STOP_SIGKILL] = UNIT_DEACTIVATING,
77 [SERVICE_STOP_POST] = UNIT_DEACTIVATING,
78 [SERVICE_FINAL_SIGTERM] = UNIT_DEACTIVATING,
79 [SERVICE_FINAL_SIGKILL] = UNIT_DEACTIVATING,
80 [SERVICE_FAILED] = UNIT_FAILED,
81 [SERVICE_AUTO_RESTART] = UNIT_ACTIVATING
82 };
83
84 static int service_dispatch_inotify_io(sd_event_source *source, int fd, uint32_t events, void *userdata);
85 static int service_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata);
86 static int service_dispatch_watchdog(sd_event_source *source, usec_t usec, void *userdata);
87 static int service_dispatch_exec_io(sd_event_source *source, int fd, uint32_t events, void *userdata);
88
89 static void service_enter_signal(Service *s, ServiceState state, ServiceResult f);
90 static void service_enter_reload_by_notify(Service *s);
91
92 static void service_init(Unit *u) {
93 Service *s = SERVICE(u);
94
95 assert(u);
96 assert(u->load_state == UNIT_STUB);
97
98 s->timeout_start_usec = u->manager->default_timeout_start_usec;
99 s->timeout_stop_usec = u->manager->default_timeout_stop_usec;
100 s->restart_usec = u->manager->default_restart_usec;
101 s->runtime_max_usec = USEC_INFINITY;
102 s->type = _SERVICE_TYPE_INVALID;
103 s->socket_fd = -1;
104 s->stdin_fd = s->stdout_fd = s->stderr_fd = -1;
105 s->guess_main_pid = true;
106
107 s->control_command_id = _SERVICE_EXEC_COMMAND_INVALID;
108
109 s->exec_context.keyring_mode = MANAGER_IS_SYSTEM(u->manager) ?
110 EXEC_KEYRING_PRIVATE : EXEC_KEYRING_INHERIT;
111
112 s->watchdog_original_usec = USEC_INFINITY;
113 }
114
115 static void service_unwatch_control_pid(Service *s) {
116 assert(s);
117
118 if (s->control_pid <= 0)
119 return;
120
121 unit_unwatch_pid(UNIT(s), s->control_pid);
122 s->control_pid = 0;
123 }
124
125 static void service_unwatch_main_pid(Service *s) {
126 assert(s);
127
128 if (s->main_pid <= 0)
129 return;
130
131 unit_unwatch_pid(UNIT(s), s->main_pid);
132 s->main_pid = 0;
133 }
134
135 static void service_unwatch_pid_file(Service *s) {
136 if (!s->pid_file_pathspec)
137 return;
138
139 log_unit_debug(UNIT(s), "Stopping watch for PID file %s", s->pid_file_pathspec->path);
140 path_spec_unwatch(s->pid_file_pathspec);
141 path_spec_done(s->pid_file_pathspec);
142 s->pid_file_pathspec = mfree(s->pid_file_pathspec);
143 }
144
145 static int service_set_main_pid(Service *s, pid_t pid) {
146 pid_t ppid;
147
148 assert(s);
149
150 if (pid <= 1)
151 return -EINVAL;
152
153 if (pid == getpid_cached())
154 return -EINVAL;
155
156 if (s->main_pid == pid && s->main_pid_known)
157 return 0;
158
159 if (s->main_pid != pid) {
160 service_unwatch_main_pid(s);
161 exec_status_start(&s->main_exec_status, pid);
162 }
163
164 s->main_pid = pid;
165 s->main_pid_known = true;
166
167 if (get_process_ppid(pid, &ppid) >= 0 && ppid != getpid_cached()) {
168 log_unit_warning(UNIT(s), "Supervising process "PID_FMT" which is not our child. We'll most likely not notice when it exits.", pid);
169 s->main_pid_alien = true;
170 } else
171 s->main_pid_alien = false;
172
173 return 0;
174 }
175
176 void service_close_socket_fd(Service *s) {
177 assert(s);
178
179 /* Undo the effect of service_set_socket_fd(). */
180
181 s->socket_fd = asynchronous_close(s->socket_fd);
182
183 if (UNIT_ISSET(s->accept_socket)) {
184 socket_connection_unref(SOCKET(UNIT_DEREF(s->accept_socket)));
185 unit_ref_unset(&s->accept_socket);
186 }
187 }
188
189 static void service_stop_watchdog(Service *s) {
190 assert(s);
191
192 s->watchdog_event_source = sd_event_source_unref(s->watchdog_event_source);
193 s->watchdog_timestamp = DUAL_TIMESTAMP_NULL;
194 }
195
196 static usec_t service_get_watchdog_usec(Service *s) {
197 assert(s);
198
199 if (s->watchdog_override_enable)
200 return s->watchdog_override_usec;
201
202 return s->watchdog_original_usec;
203 }
204
205 static void service_start_watchdog(Service *s) {
206 usec_t watchdog_usec;
207 int r;
208
209 assert(s);
210
211 watchdog_usec = service_get_watchdog_usec(s);
212 if (IN_SET(watchdog_usec, 0, USEC_INFINITY)) {
213 service_stop_watchdog(s);
214 return;
215 }
216
217 if (s->watchdog_event_source) {
218 r = sd_event_source_set_time(s->watchdog_event_source, usec_add(s->watchdog_timestamp.monotonic, watchdog_usec));
219 if (r < 0) {
220 log_unit_warning_errno(UNIT(s), r, "Failed to reset watchdog timer: %m");
221 return;
222 }
223
224 r = sd_event_source_set_enabled(s->watchdog_event_source, SD_EVENT_ONESHOT);
225 } else {
226 r = sd_event_add_time(
227 UNIT(s)->manager->event,
228 &s->watchdog_event_source,
229 CLOCK_MONOTONIC,
230 usec_add(s->watchdog_timestamp.monotonic, watchdog_usec), 0,
231 service_dispatch_watchdog, s);
232 if (r < 0) {
233 log_unit_warning_errno(UNIT(s), r, "Failed to add watchdog timer: %m");
234 return;
235 }
236
237 (void) sd_event_source_set_description(s->watchdog_event_source, "service-watchdog");
238
239 /* Let's process everything else which might be a sign
240 * of living before we consider a service died. */
241 r = sd_event_source_set_priority(s->watchdog_event_source, SD_EVENT_PRIORITY_IDLE);
242 }
243 if (r < 0)
244 log_unit_warning_errno(UNIT(s), r, "Failed to install watchdog timer: %m");
245 }
246
247 static void service_extend_event_source_timeout(Service *s, sd_event_source *source, usec_t extended) {
248 usec_t current;
249 int r;
250
251 assert(s);
252
253 /* Extends the specified event source timer to at least the specified time, unless it is already later
254 * anyway. */
255
256 if (!source)
257 return;
258
259 r = sd_event_source_get_time(source, &current);
260 if (r < 0) {
261 const char *desc;
262 (void) sd_event_source_get_description(s->timer_event_source, &desc);
263 log_unit_warning_errno(UNIT(s), r, "Failed to retrieve timeout time for event source '%s', ignoring: %m", strna(desc));
264 return;
265 }
266
267 if (current >= extended) /* Current timeout is already longer, ignore this. */
268 return;
269
270 r = sd_event_source_set_time(source, extended);
271 if (r < 0) {
272 const char *desc;
273 (void) sd_event_source_get_description(s->timer_event_source, &desc);
274 log_unit_warning_errno(UNIT(s), r, "Failed to set timeout time for even source '%s', ignoring %m", strna(desc));
275 }
276 }
277
278 static void service_extend_timeout(Service *s, usec_t extend_timeout_usec) {
279 usec_t extended;
280
281 assert(s);
282
283 if (IN_SET(extend_timeout_usec, 0, USEC_INFINITY))
284 return;
285
286 extended = usec_add(now(CLOCK_MONOTONIC), extend_timeout_usec);
287
288 service_extend_event_source_timeout(s, s->timer_event_source, extended);
289 service_extend_event_source_timeout(s, s->watchdog_event_source, extended);
290 }
291
292 static void service_reset_watchdog(Service *s) {
293 assert(s);
294
295 dual_timestamp_get(&s->watchdog_timestamp);
296 service_start_watchdog(s);
297 }
298
299 static void service_override_watchdog_timeout(Service *s, usec_t watchdog_override_usec) {
300 assert(s);
301
302 s->watchdog_override_enable = true;
303 s->watchdog_override_usec = watchdog_override_usec;
304 service_reset_watchdog(s);
305
306 log_unit_debug(UNIT(s), "watchdog_usec="USEC_FMT, s->watchdog_usec);
307 log_unit_debug(UNIT(s), "watchdog_override_usec="USEC_FMT, s->watchdog_override_usec);
308 }
309
310 static void service_fd_store_unlink(ServiceFDStore *fs) {
311
312 if (!fs)
313 return;
314
315 if (fs->service) {
316 assert(fs->service->n_fd_store > 0);
317 LIST_REMOVE(fd_store, fs->service->fd_store, fs);
318 fs->service->n_fd_store--;
319 }
320
321 if (fs->event_source) {
322 sd_event_source_set_enabled(fs->event_source, SD_EVENT_OFF);
323 sd_event_source_unref(fs->event_source);
324 }
325
326 free(fs->fdname);
327 safe_close(fs->fd);
328 free(fs);
329 }
330
331 static void service_release_fd_store(Service *s) {
332 assert(s);
333
334 if (s->n_keep_fd_store > 0)
335 return;
336
337 log_unit_debug(UNIT(s), "Releasing all stored fds");
338 while (s->fd_store)
339 service_fd_store_unlink(s->fd_store);
340
341 assert(s->n_fd_store == 0);
342 }
343
344 static void service_release_resources(Unit *u) {
345 Service *s = SERVICE(u);
346
347 assert(s);
348
349 if (!s->fd_store && s->stdin_fd < 0 && s->stdout_fd < 0 && s->stderr_fd < 0)
350 return;
351
352 log_unit_debug(u, "Releasing resources.");
353
354 s->stdin_fd = safe_close(s->stdin_fd);
355 s->stdout_fd = safe_close(s->stdout_fd);
356 s->stderr_fd = safe_close(s->stderr_fd);
357
358 service_release_fd_store(s);
359 }
360
361 static void service_done(Unit *u) {
362 Service *s = SERVICE(u);
363
364 assert(s);
365
366 s->pid_file = mfree(s->pid_file);
367 s->status_text = mfree(s->status_text);
368
369 s->exec_runtime = exec_runtime_unref(s->exec_runtime, false);
370 exec_command_free_array(s->exec_command, _SERVICE_EXEC_COMMAND_MAX);
371 s->control_command = NULL;
372 s->main_command = NULL;
373
374 dynamic_creds_unref(&s->dynamic_creds);
375
376 exit_status_set_free(&s->restart_prevent_status);
377 exit_status_set_free(&s->restart_force_status);
378 exit_status_set_free(&s->success_status);
379
380 /* This will leak a process, but at least no memory or any of
381 * our resources */
382 service_unwatch_main_pid(s);
383 service_unwatch_control_pid(s);
384 service_unwatch_pid_file(s);
385
386 if (s->bus_name) {
387 unit_unwatch_bus_name(u, s->bus_name);
388 s->bus_name = mfree(s->bus_name);
389 }
390
391 s->bus_name_owner = mfree(s->bus_name_owner);
392
393 s->usb_function_descriptors = mfree(s->usb_function_descriptors);
394 s->usb_function_strings = mfree(s->usb_function_strings);
395
396 service_close_socket_fd(s);
397 s->peer = socket_peer_unref(s->peer);
398
399 unit_ref_unset(&s->accept_socket);
400
401 service_stop_watchdog(s);
402
403 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
404 s->exec_fd_event_source = sd_event_source_unref(s->exec_fd_event_source);
405
406 service_release_resources(u);
407 }
408
409 static int on_fd_store_io(sd_event_source *e, int fd, uint32_t revents, void *userdata) {
410 ServiceFDStore *fs = userdata;
411
412 assert(e);
413 assert(fs);
414
415 /* If we get either EPOLLHUP or EPOLLERR, it's time to remove this entry from the fd store */
416 log_unit_debug(UNIT(fs->service),
417 "Received %s on stored fd %d (%s), closing.",
418 revents & EPOLLERR ? "EPOLLERR" : "EPOLLHUP",
419 fs->fd, strna(fs->fdname));
420 service_fd_store_unlink(fs);
421 return 0;
422 }
423
424 static int service_add_fd_store(Service *s, int fd, const char *name) {
425 ServiceFDStore *fs;
426 int r;
427
428 /* fd is always consumed if we return >= 0 */
429
430 assert(s);
431 assert(fd >= 0);
432
433 if (s->n_fd_store >= s->n_fd_store_max)
434 return -EXFULL; /* Our store is full.
435 * Use this errno rather than E[NM]FILE to distinguish from
436 * the case where systemd itself hits the file limit. */
437
438 LIST_FOREACH(fd_store, fs, s->fd_store) {
439 r = same_fd(fs->fd, fd);
440 if (r < 0)
441 return r;
442 if (r > 0) {
443 safe_close(fd);
444 return 0; /* fd already included */
445 }
446 }
447
448 fs = new0(ServiceFDStore, 1);
449 if (!fs)
450 return -ENOMEM;
451
452 fs->fd = fd;
453 fs->service = s;
454 fs->fdname = strdup(name ?: "stored");
455 if (!fs->fdname) {
456 free(fs);
457 return -ENOMEM;
458 }
459
460 r = sd_event_add_io(UNIT(s)->manager->event, &fs->event_source, fd, 0, on_fd_store_io, fs);
461 if (r < 0 && r != -EPERM) { /* EPERM indicates fds that aren't pollable, which is OK */
462 free(fs->fdname);
463 free(fs);
464 return r;
465 } else if (r >= 0)
466 (void) sd_event_source_set_description(fs->event_source, "service-fd-store");
467
468 LIST_PREPEND(fd_store, s->fd_store, fs);
469 s->n_fd_store++;
470
471 return 1; /* fd newly stored */
472 }
473
474 static int service_add_fd_store_set(Service *s, FDSet *fds, const char *name) {
475 int r;
476
477 assert(s);
478
479 while (fdset_size(fds) > 0) {
480 _cleanup_close_ int fd = -1;
481
482 fd = fdset_steal_first(fds);
483 if (fd < 0)
484 break;
485
486 r = service_add_fd_store(s, fd, name);
487 if (r == -EXFULL)
488 return log_unit_warning_errno(UNIT(s), r,
489 "Cannot store more fds than FileDescriptorStoreMax=%u, closing remaining.",
490 s->n_fd_store_max);
491 if (r < 0)
492 return log_unit_error_errno(UNIT(s), r, "Failed to add fd to store: %m");
493 if (r > 0)
494 log_unit_debug(UNIT(s), "Added fd %u (%s) to fd store.", fd, strna(name));
495 fd = -1;
496 }
497
498 return 0;
499 }
500
501 static void service_remove_fd_store(Service *s, const char *name) {
502 ServiceFDStore *fs, *n;
503
504 assert(s);
505 assert(name);
506
507 LIST_FOREACH_SAFE(fd_store, fs, n, s->fd_store) {
508 if (!streq(fs->fdname, name))
509 continue;
510
511 log_unit_debug(UNIT(s), "Got explicit request to remove fd %i (%s), closing.", fs->fd, name);
512 service_fd_store_unlink(fs);
513 }
514 }
515
516 static int service_arm_timer(Service *s, usec_t usec) {
517 int r;
518
519 assert(s);
520
521 if (s->timer_event_source) {
522 r = sd_event_source_set_time(s->timer_event_source, usec);
523 if (r < 0)
524 return r;
525
526 return sd_event_source_set_enabled(s->timer_event_source, SD_EVENT_ONESHOT);
527 }
528
529 if (usec == USEC_INFINITY)
530 return 0;
531
532 r = sd_event_add_time(
533 UNIT(s)->manager->event,
534 &s->timer_event_source,
535 CLOCK_MONOTONIC,
536 usec, 0,
537 service_dispatch_timer, s);
538 if (r < 0)
539 return r;
540
541 (void) sd_event_source_set_description(s->timer_event_source, "service-timer");
542
543 return 0;
544 }
545
546 static int service_verify(Service *s) {
547 assert(s);
548
549 if (UNIT(s)->load_state != UNIT_LOADED)
550 return 0;
551
552 if (!s->exec_command[SERVICE_EXEC_START] && !s->exec_command[SERVICE_EXEC_STOP]
553 && UNIT(s)->success_action == EMERGENCY_ACTION_NONE) {
554 /* FailureAction= only makes sense if one of the start or stop commands is specified.
555 * SuccessAction= will be executed unconditionally if no commands are specified. Hence,
556 * either a command or SuccessAction= are required. */
557
558 log_unit_error(UNIT(s), "Service has no ExecStart=, ExecStop=, or SuccessAction=. Refusing.");
559 return -ENOEXEC;
560 }
561
562 if (s->type != SERVICE_ONESHOT && !s->exec_command[SERVICE_EXEC_START]) {
563 log_unit_error(UNIT(s), "Service has no ExecStart= setting, which is only allowed for Type=oneshot services. Refusing.");
564 return -ENOEXEC;
565 }
566
567 if (!s->remain_after_exit && !s->exec_command[SERVICE_EXEC_START] && UNIT(s)->success_action == EMERGENCY_ACTION_NONE) {
568 log_unit_error(UNIT(s), "Service has no ExecStart= and no SuccessAction= settings and does not have RemainAfterExit=yes set. Refusing.");
569 return -ENOEXEC;
570 }
571
572 if (s->type != SERVICE_ONESHOT && s->exec_command[SERVICE_EXEC_START]->command_next) {
573 log_unit_error(UNIT(s), "Service has more than one ExecStart= setting, which is only allowed for Type=oneshot services. Refusing.");
574 return -ENOEXEC;
575 }
576
577 if (s->type == SERVICE_ONESHOT && s->restart != SERVICE_RESTART_NO) {
578 log_unit_error(UNIT(s), "Service has Restart= setting other than no, which isn't allowed for Type=oneshot services. Refusing.");
579 return -ENOEXEC;
580 }
581
582 if (s->type == SERVICE_ONESHOT && !exit_status_set_is_empty(&s->restart_force_status)) {
583 log_unit_error(UNIT(s), "Service has RestartForceStatus= set, which isn't allowed for Type=oneshot services. Refusing.");
584 return -ENOEXEC;
585 }
586
587 if (s->type == SERVICE_DBUS && !s->bus_name) {
588 log_unit_error(UNIT(s), "Service is of type D-Bus but no D-Bus service name has been specified. Refusing.");
589 return -ENOEXEC;
590 }
591
592 if (s->bus_name && s->type != SERVICE_DBUS)
593 log_unit_warning(UNIT(s), "Service has a D-Bus service name specified, but is not of type dbus. Ignoring.");
594
595 if (s->exec_context.pam_name && !IN_SET(s->kill_context.kill_mode, KILL_CONTROL_GROUP, KILL_MIXED)) {
596 log_unit_error(UNIT(s), "Service has PAM enabled. Kill mode must be set to 'control-group' or 'mixed'. Refusing.");
597 return -ENOEXEC;
598 }
599
600 if (s->usb_function_descriptors && !s->usb_function_strings)
601 log_unit_warning(UNIT(s), "Service has USBFunctionDescriptors= setting, but no USBFunctionStrings=. Ignoring.");
602
603 if (!s->usb_function_descriptors && s->usb_function_strings)
604 log_unit_warning(UNIT(s), "Service has USBFunctionStrings= setting, but no USBFunctionDescriptors=. Ignoring.");
605
606 if (s->runtime_max_usec != USEC_INFINITY && s->type == SERVICE_ONESHOT)
607 log_unit_warning(UNIT(s), "MaxRuntimeSec= has no effect in combination with Type=oneshot. Ignoring.");
608
609 return 0;
610 }
611
612 static int service_add_default_dependencies(Service *s) {
613 int r;
614
615 assert(s);
616
617 if (!UNIT(s)->default_dependencies)
618 return 0;
619
620 /* Add a number of automatic dependencies useful for the
621 * majority of services. */
622
623 if (MANAGER_IS_SYSTEM(UNIT(s)->manager)) {
624 /* First, pull in the really early boot stuff, and
625 * require it, so that we fail if we can't acquire
626 * it. */
627
628 r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SYSINIT_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
629 if (r < 0)
630 return r;
631 } else {
632
633 /* In the --user instance there's no sysinit.target,
634 * in that case require basic.target instead. */
635
636 r = unit_add_dependency_by_name(UNIT(s), UNIT_REQUIRES, SPECIAL_BASIC_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
637 if (r < 0)
638 return r;
639 }
640
641 /* Second, if the rest of the base system is in the same
642 * transaction, order us after it, but do not pull it in or
643 * even require it. */
644 r = unit_add_dependency_by_name(UNIT(s), UNIT_AFTER, SPECIAL_BASIC_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
645 if (r < 0)
646 return r;
647
648 /* Third, add us in for normal shutdown. */
649 return unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
650 }
651
652 static void service_fix_output(Service *s) {
653 assert(s);
654
655 /* If nothing has been explicitly configured, patch default output in. If input is socket/tty we avoid this
656 * however, since in that case we want output to default to the same place as we read input from. */
657
658 if (s->exec_context.std_error == EXEC_OUTPUT_INHERIT &&
659 s->exec_context.std_output == EXEC_OUTPUT_INHERIT &&
660 s->exec_context.std_input == EXEC_INPUT_NULL)
661 s->exec_context.std_error = UNIT(s)->manager->default_std_error;
662
663 if (s->exec_context.std_output == EXEC_OUTPUT_INHERIT &&
664 s->exec_context.std_input == EXEC_INPUT_NULL)
665 s->exec_context.std_output = UNIT(s)->manager->default_std_output;
666
667 if (s->exec_context.std_input == EXEC_INPUT_NULL &&
668 s->exec_context.stdin_data_size > 0)
669 s->exec_context.std_input = EXEC_INPUT_DATA;
670 }
671
672 static int service_setup_bus_name(Service *s) {
673 int r;
674
675 assert(s);
676
677 if (!s->bus_name)
678 return 0;
679
680 r = unit_add_dependency_by_name(UNIT(s), UNIT_REQUIRES, SPECIAL_DBUS_SOCKET, true, UNIT_DEPENDENCY_FILE);
681 if (r < 0)
682 return log_unit_error_errno(UNIT(s), r, "Failed to add dependency on " SPECIAL_DBUS_SOCKET ": %m");
683
684 /* We always want to be ordered against dbus.socket if both are in the transaction. */
685 r = unit_add_dependency_by_name(UNIT(s), UNIT_AFTER, SPECIAL_DBUS_SOCKET, true, UNIT_DEPENDENCY_FILE);
686 if (r < 0)
687 return log_unit_error_errno(UNIT(s), r, "Failed to add dependency on " SPECIAL_DBUS_SOCKET ": %m");
688
689 r = unit_watch_bus_name(UNIT(s), s->bus_name);
690 if (r == -EEXIST)
691 return log_unit_error_errno(UNIT(s), r, "Two services allocated for the same bus name %s, refusing operation.", s->bus_name);
692 if (r < 0)
693 return log_unit_error_errno(UNIT(s), r, "Cannot watch bus name %s: %m", s->bus_name);
694
695 return 0;
696 }
697
698 static int service_add_extras(Service *s) {
699 int r;
700
701 assert(s);
702
703 if (s->type == _SERVICE_TYPE_INVALID) {
704 /* Figure out a type automatically */
705 if (s->bus_name)
706 s->type = SERVICE_DBUS;
707 else if (s->exec_command[SERVICE_EXEC_START])
708 s->type = SERVICE_SIMPLE;
709 else
710 s->type = SERVICE_ONESHOT;
711 }
712
713 /* Oneshot services have disabled start timeout by default */
714 if (s->type == SERVICE_ONESHOT && !s->start_timeout_defined)
715 s->timeout_start_usec = USEC_INFINITY;
716
717 service_fix_output(s);
718
719 r = unit_patch_contexts(UNIT(s));
720 if (r < 0)
721 return r;
722
723 r = unit_add_exec_dependencies(UNIT(s), &s->exec_context);
724 if (r < 0)
725 return r;
726
727 r = unit_set_default_slice(UNIT(s));
728 if (r < 0)
729 return r;
730
731 /* If the service needs the notify socket, let's enable it automatically. */
732 if (s->notify_access == NOTIFY_NONE &&
733 (s->type == SERVICE_NOTIFY || s->watchdog_usec > 0 || s->n_fd_store_max > 0))
734 s->notify_access = NOTIFY_MAIN;
735
736 r = service_add_default_dependencies(s);
737 if (r < 0)
738 return r;
739
740 r = service_setup_bus_name(s);
741 if (r < 0)
742 return r;
743
744 return 0;
745 }
746
747 static int service_load(Unit *u) {
748 Service *s = SERVICE(u);
749 int r;
750
751 assert(s);
752
753 /* Load a .service file */
754 r = unit_load_fragment(u);
755 if (r < 0)
756 return r;
757
758 /* Still nothing found? Then let's give up */
759 if (u->load_state == UNIT_STUB)
760 return -ENOENT;
761
762 /* This is a new unit? Then let's add in some extras */
763 if (u->load_state == UNIT_LOADED) {
764
765 /* We were able to load something, then let's add in
766 * the dropin directories. */
767 r = unit_load_dropin(u);
768 if (r < 0)
769 return r;
770
771 /* This is a new unit? Then let's add in some
772 * extras */
773 r = service_add_extras(s);
774 if (r < 0)
775 return r;
776 }
777
778 return service_verify(s);
779 }
780
781 static void service_dump(Unit *u, FILE *f, const char *prefix) {
782 char buf_restart[FORMAT_TIMESPAN_MAX], buf_start[FORMAT_TIMESPAN_MAX], buf_stop[FORMAT_TIMESPAN_MAX];
783 char buf_runtime[FORMAT_TIMESPAN_MAX], buf_watchdog[FORMAT_TIMESPAN_MAX];
784 ServiceExecCommand c;
785 Service *s = SERVICE(u);
786 const char *prefix2;
787
788 assert(s);
789
790 prefix = strempty(prefix);
791 prefix2 = strjoina(prefix, "\t");
792
793 fprintf(f,
794 "%sService State: %s\n"
795 "%sResult: %s\n"
796 "%sReload Result: %s\n"
797 "%sPermissionsStartOnly: %s\n"
798 "%sRootDirectoryStartOnly: %s\n"
799 "%sRemainAfterExit: %s\n"
800 "%sGuessMainPID: %s\n"
801 "%sType: %s\n"
802 "%sRestart: %s\n"
803 "%sNotifyAccess: %s\n"
804 "%sNotifyState: %s\n",
805 prefix, service_state_to_string(s->state),
806 prefix, service_result_to_string(s->result),
807 prefix, service_result_to_string(s->reload_result),
808 prefix, yes_no(s->permissions_start_only),
809 prefix, yes_no(s->root_directory_start_only),
810 prefix, yes_no(s->remain_after_exit),
811 prefix, yes_no(s->guess_main_pid),
812 prefix, service_type_to_string(s->type),
813 prefix, service_restart_to_string(s->restart),
814 prefix, notify_access_to_string(s->notify_access),
815 prefix, notify_state_to_string(s->notify_state));
816
817 if (s->control_pid > 0)
818 fprintf(f,
819 "%sControl PID: "PID_FMT"\n",
820 prefix, s->control_pid);
821
822 if (s->main_pid > 0)
823 fprintf(f,
824 "%sMain PID: "PID_FMT"\n"
825 "%sMain PID Known: %s\n"
826 "%sMain PID Alien: %s\n",
827 prefix, s->main_pid,
828 prefix, yes_no(s->main_pid_known),
829 prefix, yes_no(s->main_pid_alien));
830
831 if (s->pid_file)
832 fprintf(f,
833 "%sPIDFile: %s\n",
834 prefix, s->pid_file);
835
836 if (s->bus_name)
837 fprintf(f,
838 "%sBusName: %s\n"
839 "%sBus Name Good: %s\n",
840 prefix, s->bus_name,
841 prefix, yes_no(s->bus_name_good));
842
843 if (UNIT_ISSET(s->accept_socket))
844 fprintf(f,
845 "%sAccept Socket: %s\n",
846 prefix, UNIT_DEREF(s->accept_socket)->id);
847
848 fprintf(f,
849 "%sRestartSec: %s\n"
850 "%sTimeoutStartSec: %s\n"
851 "%sTimeoutStopSec: %s\n"
852 "%sRuntimeMaxSec: %s\n"
853 "%sWatchdogSec: %s\n",
854 prefix, format_timespan(buf_restart, sizeof(buf_restart), s->restart_usec, USEC_PER_SEC),
855 prefix, format_timespan(buf_start, sizeof(buf_start), s->timeout_start_usec, USEC_PER_SEC),
856 prefix, format_timespan(buf_stop, sizeof(buf_stop), s->timeout_stop_usec, USEC_PER_SEC),
857 prefix, format_timespan(buf_runtime, sizeof(buf_runtime), s->runtime_max_usec, USEC_PER_SEC),
858 prefix, format_timespan(buf_watchdog, sizeof(buf_watchdog), s->watchdog_usec, USEC_PER_SEC));
859
860 kill_context_dump(&s->kill_context, f, prefix);
861 exec_context_dump(&s->exec_context, f, prefix);
862
863 for (c = 0; c < _SERVICE_EXEC_COMMAND_MAX; c++) {
864
865 if (!s->exec_command[c])
866 continue;
867
868 fprintf(f, "%s-> %s:\n",
869 prefix, service_exec_command_to_string(c));
870
871 exec_command_dump_list(s->exec_command[c], f, prefix2);
872 }
873
874 if (s->status_text)
875 fprintf(f, "%sStatus Text: %s\n",
876 prefix, s->status_text);
877
878 if (s->n_fd_store_max > 0)
879 fprintf(f,
880 "%sFile Descriptor Store Max: %u\n"
881 "%sFile Descriptor Store Current: %zu\n",
882 prefix, s->n_fd_store_max,
883 prefix, s->n_fd_store);
884
885 cgroup_context_dump(&s->cgroup_context, f, prefix);
886 }
887
888 static int service_is_suitable_main_pid(Service *s, pid_t pid, int prio) {
889 Unit *owner;
890
891 assert(s);
892 assert(pid_is_valid(pid));
893
894 /* Checks whether the specified PID is suitable as main PID for this service. returns negative if not, 0 if the
895 * PID is questionnable but should be accepted if the source of configuration is trusted. > 0 if the PID is
896 * good */
897
898 if (pid == getpid_cached() || pid == 1) {
899 log_unit_full(UNIT(s), prio, 0, "New main PID "PID_FMT" is the manager, refusing.", pid);
900 return -EPERM;
901 }
902
903 if (pid == s->control_pid) {
904 log_unit_full(UNIT(s), prio, 0, "New main PID "PID_FMT" is the control process, refusing.", pid);
905 return -EPERM;
906 }
907
908 if (!pid_is_alive(pid)) {
909 log_unit_full(UNIT(s), prio, 0, "New main PID "PID_FMT" does not exist or is a zombie.", pid);
910 return -ESRCH;
911 }
912
913 owner = manager_get_unit_by_pid(UNIT(s)->manager, pid);
914 if (owner == UNIT(s)) {
915 log_unit_debug(UNIT(s), "New main PID "PID_FMT" belongs to service, we are happy.", pid);
916 return 1; /* Yay, it's definitely a good PID */
917 }
918
919 return 0; /* Hmm it's a suspicious PID, let's accept it if configuration source is trusted */
920 }
921
922 static int service_load_pid_file(Service *s, bool may_warn) {
923 char procfs[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
924 bool questionable_pid_file = false;
925 _cleanup_free_ char *k = NULL;
926 _cleanup_close_ int fd = -1;
927 int r, prio;
928 pid_t pid;
929
930 assert(s);
931
932 if (!s->pid_file)
933 return -ENOENT;
934
935 prio = may_warn ? LOG_INFO : LOG_DEBUG;
936
937 fd = chase_symlinks(s->pid_file, NULL, CHASE_OPEN|CHASE_SAFE, NULL);
938 if (fd == -ENOLINK) {
939 log_unit_full(UNIT(s), LOG_DEBUG, fd, "Potentially unsafe symlink chain, will now retry with relaxed checks: %s", s->pid_file);
940
941 questionable_pid_file = true;
942
943 fd = chase_symlinks(s->pid_file, NULL, CHASE_OPEN, NULL);
944 }
945 if (fd < 0)
946 return log_unit_full(UNIT(s), prio, fd, "Can't open PID file %s (yet?) after %s: %m", s->pid_file, service_state_to_string(s->state));
947
948 /* Let's read the PID file now that we chased it down. But we need to convert the O_PATH fd chase_symlinks() returned us into a proper fd first. */
949 xsprintf(procfs, "/proc/self/fd/%i", fd);
950 r = read_one_line_file(procfs, &k);
951 if (r < 0)
952 return log_unit_error_errno(UNIT(s), r, "Can't convert PID files %s O_PATH file descriptor to proper file descriptor: %m", s->pid_file);
953
954 r = parse_pid(k, &pid);
955 if (r < 0)
956 return log_unit_full(UNIT(s), prio, r, "Failed to parse PID from file %s: %m", s->pid_file);
957
958 if (s->main_pid_known && pid == s->main_pid)
959 return 0;
960
961 r = service_is_suitable_main_pid(s, pid, prio);
962 if (r < 0)
963 return r;
964 if (r == 0) {
965 struct stat st;
966
967 if (questionable_pid_file) {
968 log_unit_error(UNIT(s), "Refusing to accept PID outside of service control group, acquired through unsafe symlink chain: %s", s->pid_file);
969 return -EPERM;
970 }
971
972 /* Hmm, it's not clear if the new main PID is safe. Let's allow this if the PID file is owned by root */
973
974 if (fstat(fd, &st) < 0)
975 return log_unit_error_errno(UNIT(s), errno, "Failed to fstat() PID file O_PATH fd: %m");
976
977 if (st.st_uid != 0) {
978 log_unit_error(UNIT(s), "New main PID "PID_FMT" does not belong to service, and PID file is not owned by root. Refusing.", pid);
979 return -EPERM;
980 }
981
982 log_unit_debug(UNIT(s), "New main PID "PID_FMT" does not belong to service, but we'll accept it since PID file is owned by root.", pid);
983 }
984
985 if (s->main_pid_known) {
986 log_unit_debug(UNIT(s), "Main PID changing: "PID_FMT" -> "PID_FMT, s->main_pid, pid);
987
988 service_unwatch_main_pid(s);
989 s->main_pid_known = false;
990 } else
991 log_unit_debug(UNIT(s), "Main PID loaded: "PID_FMT, pid);
992
993 r = service_set_main_pid(s, pid);
994 if (r < 0)
995 return r;
996
997 r = unit_watch_pid(UNIT(s), pid);
998 if (r < 0) /* FIXME: we need to do something here */
999 return log_unit_warning_errno(UNIT(s), r, "Failed to watch PID "PID_FMT" for service: %m", pid);
1000
1001 return 1;
1002 }
1003
1004 static void service_search_main_pid(Service *s) {
1005 pid_t pid = 0;
1006 int r;
1007
1008 assert(s);
1009
1010 /* If we know it anyway, don't ever fallback to unreliable
1011 * heuristics */
1012 if (s->main_pid_known)
1013 return;
1014
1015 if (!s->guess_main_pid)
1016 return;
1017
1018 assert(s->main_pid <= 0);
1019
1020 if (unit_search_main_pid(UNIT(s), &pid) < 0)
1021 return;
1022
1023 log_unit_debug(UNIT(s), "Main PID guessed: "PID_FMT, pid);
1024 if (service_set_main_pid(s, pid) < 0)
1025 return;
1026
1027 r = unit_watch_pid(UNIT(s), pid);
1028 if (r < 0)
1029 /* FIXME: we need to do something here */
1030 log_unit_warning_errno(UNIT(s), r, "Failed to watch PID "PID_FMT" from: %m", pid);
1031 }
1032
1033 static void service_set_state(Service *s, ServiceState state) {
1034 ServiceState old_state;
1035 const UnitActiveState *table;
1036
1037 assert(s);
1038
1039 if (s->state != state)
1040 bus_unit_send_pending_change_signal(UNIT(s), false);
1041
1042 table = s->type == SERVICE_IDLE ? state_translation_table_idle : state_translation_table;
1043
1044 old_state = s->state;
1045 s->state = state;
1046
1047 service_unwatch_pid_file(s);
1048
1049 if (!IN_SET(state,
1050 SERVICE_START_PRE, SERVICE_START, SERVICE_START_POST,
1051 SERVICE_RUNNING,
1052 SERVICE_RELOAD,
1053 SERVICE_STOP, SERVICE_STOP_WATCHDOG, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL, SERVICE_STOP_POST,
1054 SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL,
1055 SERVICE_AUTO_RESTART))
1056 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
1057
1058 if (!IN_SET(state,
1059 SERVICE_START, SERVICE_START_POST,
1060 SERVICE_RUNNING, SERVICE_RELOAD,
1061 SERVICE_STOP, SERVICE_STOP_WATCHDOG, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL, SERVICE_STOP_POST,
1062 SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL)) {
1063 service_unwatch_main_pid(s);
1064 s->main_command = NULL;
1065 }
1066
1067 if (!IN_SET(state,
1068 SERVICE_START_PRE, SERVICE_START, SERVICE_START_POST,
1069 SERVICE_RELOAD,
1070 SERVICE_STOP, SERVICE_STOP_WATCHDOG, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL, SERVICE_STOP_POST,
1071 SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL)) {
1072 service_unwatch_control_pid(s);
1073 s->control_command = NULL;
1074 s->control_command_id = _SERVICE_EXEC_COMMAND_INVALID;
1075 }
1076
1077 if (IN_SET(state, SERVICE_DEAD, SERVICE_FAILED, SERVICE_AUTO_RESTART)) {
1078 unit_unwatch_all_pids(UNIT(s));
1079 unit_dequeue_rewatch_pids(UNIT(s));
1080 }
1081
1082 if (!IN_SET(state,
1083 SERVICE_START_PRE, SERVICE_START, SERVICE_START_POST,
1084 SERVICE_RUNNING, SERVICE_RELOAD,
1085 SERVICE_STOP, SERVICE_STOP_WATCHDOG, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL, SERVICE_STOP_POST,
1086 SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL) &&
1087 !(state == SERVICE_DEAD && UNIT(s)->job))
1088 service_close_socket_fd(s);
1089
1090 if (state != SERVICE_START)
1091 s->exec_fd_event_source = sd_event_source_unref(s->exec_fd_event_source);
1092
1093 if (!IN_SET(state, SERVICE_START_POST, SERVICE_RUNNING, SERVICE_RELOAD))
1094 service_stop_watchdog(s);
1095
1096 /* For the inactive states unit_notify() will trim the cgroup,
1097 * but for exit we have to do that ourselves... */
1098 if (state == SERVICE_EXITED && !MANAGER_IS_RELOADING(UNIT(s)->manager))
1099 unit_prune_cgroup(UNIT(s));
1100
1101 if (old_state != state)
1102 log_unit_debug(UNIT(s), "Changed %s -> %s", service_state_to_string(old_state), service_state_to_string(state));
1103
1104 unit_notify(UNIT(s), table[old_state], table[state],
1105 (s->reload_result == SERVICE_SUCCESS ? 0 : UNIT_NOTIFY_RELOAD_FAILURE) |
1106 (s->will_auto_restart ? UNIT_NOTIFY_WILL_AUTO_RESTART : 0));
1107 }
1108
1109 static usec_t service_coldplug_timeout(Service *s) {
1110 assert(s);
1111
1112 switch (s->deserialized_state) {
1113
1114 case SERVICE_START_PRE:
1115 case SERVICE_START:
1116 case SERVICE_START_POST:
1117 case SERVICE_RELOAD:
1118 return usec_add(UNIT(s)->state_change_timestamp.monotonic, s->timeout_start_usec);
1119
1120 case SERVICE_RUNNING:
1121 return usec_add(UNIT(s)->active_enter_timestamp.monotonic, s->runtime_max_usec);
1122
1123 case SERVICE_STOP:
1124 case SERVICE_STOP_WATCHDOG:
1125 case SERVICE_STOP_SIGTERM:
1126 case SERVICE_STOP_SIGKILL:
1127 case SERVICE_STOP_POST:
1128 case SERVICE_FINAL_SIGTERM:
1129 case SERVICE_FINAL_SIGKILL:
1130 return usec_add(UNIT(s)->state_change_timestamp.monotonic, s->timeout_stop_usec);
1131
1132 case SERVICE_AUTO_RESTART:
1133 return usec_add(UNIT(s)->inactive_enter_timestamp.monotonic, s->restart_usec);
1134
1135 default:
1136 return USEC_INFINITY;
1137 }
1138 }
1139
1140 static int service_coldplug(Unit *u) {
1141 Service *s = SERVICE(u);
1142 int r;
1143
1144 assert(s);
1145 assert(s->state == SERVICE_DEAD);
1146
1147 if (s->deserialized_state == s->state)
1148 return 0;
1149
1150 r = service_arm_timer(s, service_coldplug_timeout(s));
1151 if (r < 0)
1152 return r;
1153
1154 if (s->main_pid > 0 &&
1155 pid_is_unwaited(s->main_pid) &&
1156 (IN_SET(s->deserialized_state,
1157 SERVICE_START, SERVICE_START_POST,
1158 SERVICE_RUNNING, SERVICE_RELOAD,
1159 SERVICE_STOP, SERVICE_STOP_WATCHDOG, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL, SERVICE_STOP_POST,
1160 SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL))) {
1161 r = unit_watch_pid(UNIT(s), s->main_pid);
1162 if (r < 0)
1163 return r;
1164 }
1165
1166 if (s->control_pid > 0 &&
1167 pid_is_unwaited(s->control_pid) &&
1168 IN_SET(s->deserialized_state,
1169 SERVICE_START_PRE, SERVICE_START, SERVICE_START_POST,
1170 SERVICE_RELOAD,
1171 SERVICE_STOP, SERVICE_STOP_WATCHDOG, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL, SERVICE_STOP_POST,
1172 SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL)) {
1173 r = unit_watch_pid(UNIT(s), s->control_pid);
1174 if (r < 0)
1175 return r;
1176 }
1177
1178 if (!IN_SET(s->deserialized_state, SERVICE_DEAD, SERVICE_FAILED, SERVICE_AUTO_RESTART)) {
1179 (void) unit_enqueue_rewatch_pids(u);
1180 (void) unit_setup_dynamic_creds(u);
1181 (void) unit_setup_exec_runtime(u);
1182 }
1183
1184 if (IN_SET(s->deserialized_state, SERVICE_START_POST, SERVICE_RUNNING, SERVICE_RELOAD))
1185 service_start_watchdog(s);
1186
1187 if (UNIT_ISSET(s->accept_socket)) {
1188 Socket* socket = SOCKET(UNIT_DEREF(s->accept_socket));
1189
1190 if (socket->max_connections_per_source > 0) {
1191 SocketPeer *peer;
1192
1193 /* Make a best-effort attempt at bumping the connection count */
1194 if (socket_acquire_peer(socket, s->socket_fd, &peer) > 0) {
1195 socket_peer_unref(s->peer);
1196 s->peer = peer;
1197 }
1198 }
1199 }
1200
1201 service_set_state(s, s->deserialized_state);
1202 return 0;
1203 }
1204
1205 static int service_collect_fds(
1206 Service *s,
1207 int **fds,
1208 char ***fd_names,
1209 size_t *n_socket_fds,
1210 size_t *n_storage_fds) {
1211
1212 _cleanup_strv_free_ char **rfd_names = NULL;
1213 _cleanup_free_ int *rfds = NULL;
1214 size_t rn_socket_fds = 0, rn_storage_fds = 0;
1215 int r;
1216
1217 assert(s);
1218 assert(fds);
1219 assert(fd_names);
1220 assert(n_socket_fds);
1221 assert(n_storage_fds);
1222
1223 if (s->socket_fd >= 0) {
1224
1225 /* Pass the per-connection socket */
1226
1227 rfds = new(int, 1);
1228 if (!rfds)
1229 return -ENOMEM;
1230 rfds[0] = s->socket_fd;
1231
1232 rfd_names = strv_new("connection");
1233 if (!rfd_names)
1234 return -ENOMEM;
1235
1236 rn_socket_fds = 1;
1237 } else {
1238 Iterator i;
1239 void *v;
1240 Unit *u;
1241
1242 /* Pass all our configured sockets for singleton services */
1243
1244 HASHMAP_FOREACH_KEY(v, u, UNIT(s)->dependencies[UNIT_TRIGGERED_BY], i) {
1245 _cleanup_free_ int *cfds = NULL;
1246 Socket *sock;
1247 int cn_fds;
1248
1249 if (u->type != UNIT_SOCKET)
1250 continue;
1251
1252 sock = SOCKET(u);
1253
1254 cn_fds = socket_collect_fds(sock, &cfds);
1255 if (cn_fds < 0)
1256 return cn_fds;
1257
1258 if (cn_fds <= 0)
1259 continue;
1260
1261 if (!rfds) {
1262 rfds = TAKE_PTR(cfds);
1263 rn_socket_fds = cn_fds;
1264 } else {
1265 int *t;
1266
1267 t = reallocarray(rfds, rn_socket_fds + cn_fds, sizeof(int));
1268 if (!t)
1269 return -ENOMEM;
1270
1271 memcpy(t + rn_socket_fds, cfds, cn_fds * sizeof(int));
1272
1273 rfds = t;
1274 rn_socket_fds += cn_fds;
1275 }
1276
1277 r = strv_extend_n(&rfd_names, socket_fdname(sock), cn_fds);
1278 if (r < 0)
1279 return r;
1280 }
1281 }
1282
1283 if (s->n_fd_store > 0) {
1284 ServiceFDStore *fs;
1285 size_t n_fds;
1286 char **nl;
1287 int *t;
1288
1289 t = reallocarray(rfds, rn_socket_fds + s->n_fd_store, sizeof(int));
1290 if (!t)
1291 return -ENOMEM;
1292
1293 rfds = t;
1294
1295 nl = reallocarray(rfd_names, rn_socket_fds + s->n_fd_store + 1, sizeof(char *));
1296 if (!nl)
1297 return -ENOMEM;
1298
1299 rfd_names = nl;
1300 n_fds = rn_socket_fds;
1301
1302 LIST_FOREACH(fd_store, fs, s->fd_store) {
1303 rfds[n_fds] = fs->fd;
1304 rfd_names[n_fds] = strdup(strempty(fs->fdname));
1305 if (!rfd_names[n_fds])
1306 return -ENOMEM;
1307
1308 rn_storage_fds++;
1309 n_fds++;
1310 }
1311
1312 rfd_names[n_fds] = NULL;
1313 }
1314
1315 *fds = TAKE_PTR(rfds);
1316 *fd_names = TAKE_PTR(rfd_names);
1317 *n_socket_fds = rn_socket_fds;
1318 *n_storage_fds = rn_storage_fds;
1319
1320 return 0;
1321 }
1322
1323 static int service_allocate_exec_fd_event_source(
1324 Service *s,
1325 int fd,
1326 sd_event_source **ret_event_source) {
1327
1328 _cleanup_(sd_event_source_unrefp) sd_event_source *source = NULL;
1329 int r;
1330
1331 assert(s);
1332 assert(fd >= 0);
1333 assert(ret_event_source);
1334
1335 r = sd_event_add_io(UNIT(s)->manager->event, &source, fd, 0, service_dispatch_exec_io, s);
1336 if (r < 0)
1337 return log_unit_error_errno(UNIT(s), r, "Failed to allocate exec_fd event source: %m");
1338
1339 /* This is a bit lower priority than SIGCHLD, as that carries a lot more interesting failure information */
1340
1341 r = sd_event_source_set_priority(source, SD_EVENT_PRIORITY_NORMAL-3);
1342 if (r < 0)
1343 return log_unit_error_errno(UNIT(s), r, "Failed to adjust priority of exec_fd event source: %m");
1344
1345 (void) sd_event_source_set_description(source, "service event_fd");
1346
1347 r = sd_event_source_set_io_fd_own(source, true);
1348 if (r < 0)
1349 return log_unit_error_errno(UNIT(s), r, "Failed to pass ownership of fd to event source: %m");
1350
1351 *ret_event_source = TAKE_PTR(source);
1352 return 0;
1353 }
1354
1355 static int service_allocate_exec_fd(
1356 Service *s,
1357 sd_event_source **ret_event_source,
1358 int* ret_exec_fd) {
1359
1360 _cleanup_close_pair_ int p[2] = { -1, -1 };
1361 int r;
1362
1363 assert(s);
1364 assert(ret_event_source);
1365 assert(ret_exec_fd);
1366
1367 if (pipe2(p, O_CLOEXEC|O_NONBLOCK) < 0)
1368 return log_unit_error_errno(UNIT(s), errno, "Failed to allocate exec_fd pipe: %m");
1369
1370 r = service_allocate_exec_fd_event_source(s, p[0], ret_event_source);
1371 if (r < 0)
1372 return r;
1373
1374 p[0] = -1;
1375 *ret_exec_fd = TAKE_FD(p[1]);
1376
1377 return 0;
1378 }
1379
1380 static bool service_exec_needs_notify_socket(Service *s, ExecFlags flags) {
1381 assert(s);
1382
1383 /* Notifications are accepted depending on the process and
1384 * the access setting of the service:
1385 * process: \ access: NONE MAIN EXEC ALL
1386 * main no yes yes yes
1387 * control no no yes yes
1388 * other (forked) no no no yes */
1389
1390 if (flags & EXEC_IS_CONTROL)
1391 /* A control process */
1392 return IN_SET(s->notify_access, NOTIFY_EXEC, NOTIFY_ALL);
1393
1394 /* We only spawn main processes and control processes, so any
1395 * process that is not a control process is a main process */
1396 return s->notify_access != NOTIFY_NONE;
1397 }
1398
1399 static int service_spawn(
1400 Service *s,
1401 ExecCommand *c,
1402 usec_t timeout,
1403 ExecFlags flags,
1404 pid_t *_pid) {
1405
1406 _cleanup_(exec_params_clear) ExecParameters exec_params = {
1407 .flags = flags,
1408 .stdin_fd = -1,
1409 .stdout_fd = -1,
1410 .stderr_fd = -1,
1411 .exec_fd = -1,
1412 };
1413 _cleanup_strv_free_ char **final_env = NULL, **our_env = NULL, **fd_names = NULL;
1414 _cleanup_(sd_event_source_unrefp) sd_event_source *exec_fd_source = NULL;
1415 size_t n_socket_fds = 0, n_storage_fds = 0, n_env = 0;
1416 _cleanup_close_ int exec_fd = -1;
1417 _cleanup_free_ int *fds = NULL;
1418 pid_t pid;
1419 int r;
1420
1421 assert(s);
1422 assert(c);
1423 assert(_pid);
1424
1425 r = unit_prepare_exec(UNIT(s)); /* This realizes the cgroup, among other things */
1426 if (r < 0)
1427 return r;
1428
1429 if (flags & EXEC_IS_CONTROL) {
1430 /* If this is a control process, mask the permissions/chroot application if this is requested. */
1431 if (s->permissions_start_only)
1432 exec_params.flags &= ~EXEC_APPLY_SANDBOXING;
1433 if (s->root_directory_start_only)
1434 exec_params.flags &= ~EXEC_APPLY_CHROOT;
1435 }
1436
1437 if ((flags & EXEC_PASS_FDS) ||
1438 s->exec_context.std_input == EXEC_INPUT_SOCKET ||
1439 s->exec_context.std_output == EXEC_OUTPUT_SOCKET ||
1440 s->exec_context.std_error == EXEC_OUTPUT_SOCKET) {
1441
1442 r = service_collect_fds(s, &fds, &fd_names, &n_socket_fds, &n_storage_fds);
1443 if (r < 0)
1444 return r;
1445
1446 log_unit_debug(UNIT(s), "Passing %zu fds to service", n_socket_fds + n_storage_fds);
1447 }
1448
1449 if (!FLAGS_SET(flags, EXEC_IS_CONTROL) && s->type == SERVICE_EXEC) {
1450 assert(!s->exec_fd_event_source);
1451
1452 r = service_allocate_exec_fd(s, &exec_fd_source, &exec_fd);
1453 if (r < 0)
1454 return r;
1455 }
1456
1457 r = service_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), timeout));
1458 if (r < 0)
1459 return r;
1460
1461 our_env = new0(char*, 9);
1462 if (!our_env)
1463 return -ENOMEM;
1464
1465 if (service_exec_needs_notify_socket(s, flags))
1466 if (asprintf(our_env + n_env++, "NOTIFY_SOCKET=%s", UNIT(s)->manager->notify_socket) < 0)
1467 return -ENOMEM;
1468
1469 if (s->main_pid > 0)
1470 if (asprintf(our_env + n_env++, "MAINPID="PID_FMT, s->main_pid) < 0)
1471 return -ENOMEM;
1472
1473 if (MANAGER_IS_USER(UNIT(s)->manager))
1474 if (asprintf(our_env + n_env++, "MANAGERPID="PID_FMT, getpid_cached()) < 0)
1475 return -ENOMEM;
1476
1477 if (s->socket_fd >= 0) {
1478 union sockaddr_union sa;
1479 socklen_t salen = sizeof(sa);
1480
1481 /* If this is a per-connection service instance, let's set $REMOTE_ADDR and $REMOTE_PORT to something
1482 * useful. Note that we do this only when we are still connected at this point in time, which we might
1483 * very well not be. Hence we ignore all errors when retrieving peer information (as that might result
1484 * in ENOTCONN), and just use whate we can use. */
1485
1486 if (getpeername(s->socket_fd, &sa.sa, &salen) >= 0 &&
1487 IN_SET(sa.sa.sa_family, AF_INET, AF_INET6, AF_VSOCK)) {
1488
1489 _cleanup_free_ char *addr = NULL;
1490 char *t;
1491 unsigned port;
1492
1493 r = sockaddr_pretty(&sa.sa, salen, true, false, &addr);
1494 if (r < 0)
1495 return r;
1496
1497 t = strappend("REMOTE_ADDR=", addr);
1498 if (!t)
1499 return -ENOMEM;
1500 our_env[n_env++] = t;
1501
1502 r = sockaddr_port(&sa.sa, &port);
1503 if (r < 0)
1504 return r;
1505
1506 if (asprintf(&t, "REMOTE_PORT=%u", port) < 0)
1507 return -ENOMEM;
1508 our_env[n_env++] = t;
1509 }
1510 }
1511
1512 if (flags & EXEC_SETENV_RESULT) {
1513 if (asprintf(our_env + n_env++, "SERVICE_RESULT=%s", service_result_to_string(s->result)) < 0)
1514 return -ENOMEM;
1515
1516 if (s->main_exec_status.pid > 0 &&
1517 dual_timestamp_is_set(&s->main_exec_status.exit_timestamp)) {
1518 if (asprintf(our_env + n_env++, "EXIT_CODE=%s", sigchld_code_to_string(s->main_exec_status.code)) < 0)
1519 return -ENOMEM;
1520
1521 if (s->main_exec_status.code == CLD_EXITED)
1522 r = asprintf(our_env + n_env++, "EXIT_STATUS=%i", s->main_exec_status.status);
1523 else
1524 r = asprintf(our_env + n_env++, "EXIT_STATUS=%s", signal_to_string(s->main_exec_status.status));
1525 if (r < 0)
1526 return -ENOMEM;
1527 }
1528 }
1529
1530 r = unit_set_exec_params(UNIT(s), &exec_params);
1531 if (r < 0)
1532 return r;
1533
1534 final_env = strv_env_merge(2, exec_params.environment, our_env, NULL);
1535 if (!final_env)
1536 return -ENOMEM;
1537
1538 /* System D-Bus needs nss-systemd disabled, so that we don't deadlock */
1539 SET_FLAG(exec_params.flags, EXEC_NSS_BYPASS_BUS,
1540 MANAGER_IS_SYSTEM(UNIT(s)->manager) && unit_has_name(UNIT(s), SPECIAL_DBUS_SERVICE));
1541
1542 strv_free_and_replace(exec_params.environment, final_env);
1543 exec_params.fds = fds;
1544 exec_params.fd_names = fd_names;
1545 exec_params.n_socket_fds = n_socket_fds;
1546 exec_params.n_storage_fds = n_storage_fds;
1547 exec_params.watchdog_usec = service_get_watchdog_usec(s);
1548 exec_params.selinux_context_net = s->socket_fd_selinux_context_net;
1549 if (s->type == SERVICE_IDLE)
1550 exec_params.idle_pipe = UNIT(s)->manager->idle_pipe;
1551 exec_params.stdin_fd = s->stdin_fd;
1552 exec_params.stdout_fd = s->stdout_fd;
1553 exec_params.stderr_fd = s->stderr_fd;
1554 exec_params.exec_fd = exec_fd;
1555
1556 r = exec_spawn(UNIT(s),
1557 c,
1558 &s->exec_context,
1559 &exec_params,
1560 s->exec_runtime,
1561 &s->dynamic_creds,
1562 &pid);
1563 if (r < 0)
1564 return r;
1565
1566 s->exec_fd_event_source = TAKE_PTR(exec_fd_source);
1567 s->exec_fd_hot = false;
1568
1569 r = unit_watch_pid(UNIT(s), pid);
1570 if (r < 0) /* FIXME: we need to do something here */
1571 return r;
1572
1573 *_pid = pid;
1574
1575 return 0;
1576 }
1577
1578 static int main_pid_good(Service *s) {
1579 assert(s);
1580
1581 /* Returns 0 if the pid is dead, > 0 if it is good, < 0 if we don't know */
1582
1583 /* If we know the pid file, then let's just check if it is
1584 * still valid */
1585 if (s->main_pid_known) {
1586
1587 /* If it's an alien child let's check if it is still
1588 * alive ... */
1589 if (s->main_pid_alien && s->main_pid > 0)
1590 return pid_is_alive(s->main_pid);
1591
1592 /* .. otherwise assume we'll get a SIGCHLD for it,
1593 * which we really should wait for to collect exit
1594 * status and code */
1595 return s->main_pid > 0;
1596 }
1597
1598 /* We don't know the pid */
1599 return -EAGAIN;
1600 }
1601
1602 static int control_pid_good(Service *s) {
1603 assert(s);
1604
1605 /* Returns 0 if the control PID is dead, > 0 if it is good. We never actually return < 0 here, but in order to
1606 * make this function as similar as possible to main_pid_good() and cgroup_good(), we pretend that < 0 also
1607 * means: we can't figure it out. */
1608
1609 return s->control_pid > 0;
1610 }
1611
1612 static int cgroup_good(Service *s) {
1613 int r;
1614
1615 assert(s);
1616
1617 /* Returns 0 if the cgroup is empty or doesn't exist, > 0 if it is exists and is populated, < 0 if we can't
1618 * figure it out */
1619
1620 if (!UNIT(s)->cgroup_path)
1621 return 0;
1622
1623 r = cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER, UNIT(s)->cgroup_path);
1624 if (r < 0)
1625 return r;
1626
1627 return r == 0;
1628 }
1629
1630 static bool service_shall_restart(Service *s) {
1631 assert(s);
1632
1633 /* Don't restart after manual stops */
1634 if (s->forbid_restart)
1635 return false;
1636
1637 /* Never restart if this is configured as special exception */
1638 if (exit_status_set_test(&s->restart_prevent_status, s->main_exec_status.code, s->main_exec_status.status))
1639 return false;
1640
1641 /* Restart if the exit code/status are configured as restart triggers */
1642 if (exit_status_set_test(&s->restart_force_status, s->main_exec_status.code, s->main_exec_status.status))
1643 return true;
1644
1645 switch (s->restart) {
1646
1647 case SERVICE_RESTART_NO:
1648 return false;
1649
1650 case SERVICE_RESTART_ALWAYS:
1651 return true;
1652
1653 case SERVICE_RESTART_ON_SUCCESS:
1654 return s->result == SERVICE_SUCCESS;
1655
1656 case SERVICE_RESTART_ON_FAILURE:
1657 return s->result != SERVICE_SUCCESS;
1658
1659 case SERVICE_RESTART_ON_ABNORMAL:
1660 return !IN_SET(s->result, SERVICE_SUCCESS, SERVICE_FAILURE_EXIT_CODE);
1661
1662 case SERVICE_RESTART_ON_WATCHDOG:
1663 return s->result == SERVICE_FAILURE_WATCHDOG;
1664
1665 case SERVICE_RESTART_ON_ABORT:
1666 return IN_SET(s->result, SERVICE_FAILURE_SIGNAL, SERVICE_FAILURE_CORE_DUMP);
1667
1668 default:
1669 assert_not_reached("unknown restart setting");
1670 }
1671 }
1672
1673 static bool service_will_restart(Unit *u) {
1674 Service *s = SERVICE(u);
1675
1676 assert(s);
1677
1678 if (s->will_auto_restart)
1679 return true;
1680 if (s->state == SERVICE_AUTO_RESTART)
1681 return true;
1682 if (!UNIT(s)->job)
1683 return false;
1684 if (UNIT(s)->job->type == JOB_START)
1685 return true;
1686
1687 return false;
1688 }
1689
1690 static void service_enter_dead(Service *s, ServiceResult f, bool allow_restart) {
1691 int r;
1692
1693 assert(s);
1694
1695 /* If there's a stop job queued before we enter the DEAD state, we shouldn't act on Restart=, in order to not
1696 * undo what has already been enqueued. */
1697 if (unit_stop_pending(UNIT(s)))
1698 allow_restart = false;
1699
1700 if (s->result == SERVICE_SUCCESS)
1701 s->result = f;
1702
1703 unit_log_result(UNIT(s), s->result == SERVICE_SUCCESS, service_result_to_string(s->result));
1704
1705 if (allow_restart && service_shall_restart(s))
1706 s->will_auto_restart = true;
1707
1708 /* Make sure service_release_resources() doesn't destroy our FD store, while we are changing through
1709 * SERVICE_FAILED/SERVICE_DEAD before entering into SERVICE_AUTO_RESTART. */
1710 s->n_keep_fd_store ++;
1711
1712 service_set_state(s, s->result != SERVICE_SUCCESS ? SERVICE_FAILED : SERVICE_DEAD);
1713
1714 if (s->will_auto_restart) {
1715 s->will_auto_restart = false;
1716
1717 r = service_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->restart_usec));
1718 if (r < 0) {
1719 s->n_keep_fd_store--;
1720 goto fail;
1721 }
1722
1723 service_set_state(s, SERVICE_AUTO_RESTART);
1724 } else
1725 /* If we shan't restart, then flush out the restart counter. But don't do that immediately, so that the
1726 * user can still introspect the counter. Do so on the next start. */
1727 s->flush_n_restarts = true;
1728
1729 /* The new state is in effect, let's decrease the fd store ref counter again. Let's also readd us to the GC
1730 * queue, so that the fd store is possibly gc'ed again */
1731 s->n_keep_fd_store--;
1732 unit_add_to_gc_queue(UNIT(s));
1733
1734 /* The next restart might not be a manual stop, hence reset the flag indicating manual stops */
1735 s->forbid_restart = false;
1736
1737 /* We want fresh tmpdirs in case service is started again immediately */
1738 s->exec_runtime = exec_runtime_unref(s->exec_runtime, true);
1739
1740 if (s->exec_context.runtime_directory_preserve_mode == EXEC_PRESERVE_NO ||
1741 (s->exec_context.runtime_directory_preserve_mode == EXEC_PRESERVE_RESTART && !service_will_restart(UNIT(s))))
1742 /* Also, remove the runtime directory */
1743 exec_context_destroy_runtime_directory(&s->exec_context, UNIT(s)->manager->prefix[EXEC_DIRECTORY_RUNTIME]);
1744
1745 /* Get rid of the IPC bits of the user */
1746 unit_unref_uid_gid(UNIT(s), true);
1747
1748 /* Release the user, and destroy it if we are the only remaining owner */
1749 dynamic_creds_destroy(&s->dynamic_creds);
1750
1751 /* Try to delete the pid file. At this point it will be
1752 * out-of-date, and some software might be confused by it, so
1753 * let's remove it. */
1754 if (s->pid_file)
1755 (void) unlink(s->pid_file);
1756
1757 return;
1758
1759 fail:
1760 log_unit_warning_errno(UNIT(s), r, "Failed to run install restart timer: %m");
1761 service_enter_dead(s, SERVICE_FAILURE_RESOURCES, false);
1762 }
1763
1764 static void service_enter_stop_post(Service *s, ServiceResult f) {
1765 int r;
1766 assert(s);
1767
1768 if (s->result == SERVICE_SUCCESS)
1769 s->result = f;
1770
1771 service_unwatch_control_pid(s);
1772 (void) unit_enqueue_rewatch_pids(UNIT(s));
1773
1774 s->control_command = s->exec_command[SERVICE_EXEC_STOP_POST];
1775 if (s->control_command) {
1776 s->control_command_id = SERVICE_EXEC_STOP_POST;
1777
1778 r = service_spawn(s,
1779 s->control_command,
1780 s->timeout_stop_usec,
1781 EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN|EXEC_IS_CONTROL|EXEC_SETENV_RESULT|EXEC_CONTROL_CGROUP,
1782 &s->control_pid);
1783 if (r < 0)
1784 goto fail;
1785
1786 service_set_state(s, SERVICE_STOP_POST);
1787 } else
1788 service_enter_signal(s, SERVICE_FINAL_SIGTERM, SERVICE_SUCCESS);
1789
1790 return;
1791
1792 fail:
1793 log_unit_warning_errno(UNIT(s), r, "Failed to run 'stop-post' task: %m");
1794 service_enter_signal(s, SERVICE_FINAL_SIGTERM, SERVICE_FAILURE_RESOURCES);
1795 }
1796
1797 static int state_to_kill_operation(ServiceState state) {
1798 switch (state) {
1799
1800 case SERVICE_STOP_WATCHDOG:
1801 return KILL_WATCHDOG;
1802
1803 case SERVICE_STOP_SIGTERM:
1804 case SERVICE_FINAL_SIGTERM:
1805 return KILL_TERMINATE;
1806
1807 case SERVICE_STOP_SIGKILL:
1808 case SERVICE_FINAL_SIGKILL:
1809 return KILL_KILL;
1810
1811 default:
1812 return _KILL_OPERATION_INVALID;
1813 }
1814 }
1815
1816 static void service_enter_signal(Service *s, ServiceState state, ServiceResult f) {
1817 int r;
1818
1819 assert(s);
1820
1821 if (s->result == SERVICE_SUCCESS)
1822 s->result = f;
1823
1824 /* Before sending any signal, make sure we track all members of this cgroup */
1825 (void) unit_watch_all_pids(UNIT(s));
1826
1827 /* Also, enqueue a job that we recheck all our PIDs a bit later, given that it's likely some processes have
1828 * died now */
1829 (void) unit_enqueue_rewatch_pids(UNIT(s));
1830
1831 r = unit_kill_context(
1832 UNIT(s),
1833 &s->kill_context,
1834 state_to_kill_operation(state),
1835 s->main_pid,
1836 s->control_pid,
1837 s->main_pid_alien);
1838 if (r < 0)
1839 goto fail;
1840
1841 if (r > 0) {
1842 r = service_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_stop_usec));
1843 if (r < 0)
1844 goto fail;
1845
1846 service_set_state(s, state);
1847 } else if (IN_SET(state, SERVICE_STOP_WATCHDOG, SERVICE_STOP_SIGTERM) && s->kill_context.send_sigkill)
1848 service_enter_signal(s, SERVICE_STOP_SIGKILL, SERVICE_SUCCESS);
1849 else if (IN_SET(state, SERVICE_STOP_WATCHDOG, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL))
1850 service_enter_stop_post(s, SERVICE_SUCCESS);
1851 else if (state == SERVICE_FINAL_SIGTERM && s->kill_context.send_sigkill)
1852 service_enter_signal(s, SERVICE_FINAL_SIGKILL, SERVICE_SUCCESS);
1853 else
1854 service_enter_dead(s, SERVICE_SUCCESS, true);
1855
1856 return;
1857
1858 fail:
1859 log_unit_warning_errno(UNIT(s), r, "Failed to kill processes: %m");
1860
1861 if (IN_SET(state, SERVICE_STOP_WATCHDOG, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL))
1862 service_enter_stop_post(s, SERVICE_FAILURE_RESOURCES);
1863 else
1864 service_enter_dead(s, SERVICE_FAILURE_RESOURCES, true);
1865 }
1866
1867 static void service_enter_stop_by_notify(Service *s) {
1868 assert(s);
1869
1870 (void) unit_enqueue_rewatch_pids(UNIT(s));
1871
1872 service_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_stop_usec));
1873
1874 /* The service told us it's stopping, so it's as if we SIGTERM'd it. */
1875 service_set_state(s, SERVICE_STOP_SIGTERM);
1876 }
1877
1878 static void service_enter_stop(Service *s, ServiceResult f) {
1879 int r;
1880
1881 assert(s);
1882
1883 if (s->result == SERVICE_SUCCESS)
1884 s->result = f;
1885
1886 service_unwatch_control_pid(s);
1887 (void) unit_enqueue_rewatch_pids(UNIT(s));
1888
1889 s->control_command = s->exec_command[SERVICE_EXEC_STOP];
1890 if (s->control_command) {
1891 s->control_command_id = SERVICE_EXEC_STOP;
1892
1893 r = service_spawn(s,
1894 s->control_command,
1895 s->timeout_stop_usec,
1896 EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_IS_CONTROL|EXEC_SETENV_RESULT|EXEC_CONTROL_CGROUP,
1897 &s->control_pid);
1898 if (r < 0)
1899 goto fail;
1900
1901 service_set_state(s, SERVICE_STOP);
1902 } else
1903 service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_SUCCESS);
1904
1905 return;
1906
1907 fail:
1908 log_unit_warning_errno(UNIT(s), r, "Failed to run 'stop' task: %m");
1909 service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_FAILURE_RESOURCES);
1910 }
1911
1912 static bool service_good(Service *s) {
1913 int main_pid_ok;
1914 assert(s);
1915
1916 if (s->type == SERVICE_DBUS && !s->bus_name_good)
1917 return false;
1918
1919 main_pid_ok = main_pid_good(s);
1920 if (main_pid_ok > 0) /* It's alive */
1921 return true;
1922 if (main_pid_ok == 0) /* It's dead */
1923 return false;
1924
1925 /* OK, we don't know anything about the main PID, maybe
1926 * because there is none. Let's check the control group
1927 * instead. */
1928
1929 return cgroup_good(s) != 0;
1930 }
1931
1932 static void service_enter_running(Service *s, ServiceResult f) {
1933 assert(s);
1934
1935 if (s->result == SERVICE_SUCCESS)
1936 s->result = f;
1937
1938 service_unwatch_control_pid(s);
1939
1940 if (s->result != SERVICE_SUCCESS)
1941 service_enter_signal(s, SERVICE_STOP_SIGTERM, f);
1942 else if (service_good(s)) {
1943
1944 /* If there are any queued up sd_notify() notifications, process them now */
1945 if (s->notify_state == NOTIFY_RELOADING)
1946 service_enter_reload_by_notify(s);
1947 else if (s->notify_state == NOTIFY_STOPPING)
1948 service_enter_stop_by_notify(s);
1949 else {
1950 service_set_state(s, SERVICE_RUNNING);
1951 service_arm_timer(s, usec_add(UNIT(s)->active_enter_timestamp.monotonic, s->runtime_max_usec));
1952 }
1953
1954 } else if (s->remain_after_exit)
1955 service_set_state(s, SERVICE_EXITED);
1956 else
1957 service_enter_stop(s, SERVICE_SUCCESS);
1958 }
1959
1960 static void service_enter_start_post(Service *s) {
1961 int r;
1962 assert(s);
1963
1964 service_unwatch_control_pid(s);
1965 service_reset_watchdog(s);
1966
1967 s->control_command = s->exec_command[SERVICE_EXEC_START_POST];
1968 if (s->control_command) {
1969 s->control_command_id = SERVICE_EXEC_START_POST;
1970
1971 r = service_spawn(s,
1972 s->control_command,
1973 s->timeout_start_usec,
1974 EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_IS_CONTROL|EXEC_CONTROL_CGROUP,
1975 &s->control_pid);
1976 if (r < 0)
1977 goto fail;
1978
1979 service_set_state(s, SERVICE_START_POST);
1980 } else
1981 service_enter_running(s, SERVICE_SUCCESS);
1982
1983 return;
1984
1985 fail:
1986 log_unit_warning_errno(UNIT(s), r, "Failed to run 'start-post' task: %m");
1987 service_enter_stop(s, SERVICE_FAILURE_RESOURCES);
1988 }
1989
1990 static void service_kill_control_process(Service *s) {
1991 int r;
1992
1993 assert(s);
1994
1995 if (s->control_pid <= 0)
1996 return;
1997
1998 r = kill_and_sigcont(s->control_pid, SIGKILL);
1999 if (r < 0) {
2000 _cleanup_free_ char *comm = NULL;
2001
2002 (void) get_process_comm(s->control_pid, &comm);
2003
2004 log_unit_debug_errno(UNIT(s), r, "Failed to kill control process " PID_FMT " (%s), ignoring: %m",
2005 s->control_pid, strna(comm));
2006 }
2007 }
2008
2009 static void service_enter_start(Service *s) {
2010 ExecCommand *c;
2011 usec_t timeout;
2012 pid_t pid;
2013 int r;
2014
2015 assert(s);
2016
2017 service_unwatch_control_pid(s);
2018 service_unwatch_main_pid(s);
2019
2020 unit_warn_leftover_processes(UNIT(s));
2021
2022 if (s->type == SERVICE_FORKING) {
2023 s->control_command_id = SERVICE_EXEC_START;
2024 c = s->control_command = s->exec_command[SERVICE_EXEC_START];
2025
2026 s->main_command = NULL;
2027 } else {
2028 s->control_command_id = _SERVICE_EXEC_COMMAND_INVALID;
2029 s->control_command = NULL;
2030
2031 c = s->main_command = s->exec_command[SERVICE_EXEC_START];
2032 }
2033
2034 if (!c) {
2035 if (s->type != SERVICE_ONESHOT) {
2036 /* There's no command line configured for the main command? Hmm, that is strange. This can only
2037 * happen if the configuration changes at runtime. In this case, let's enter a failure
2038 * state. */
2039 log_unit_error(UNIT(s), "There's no 'start' task anymore we could start.");
2040 r = -ENXIO;
2041 goto fail;
2042 }
2043
2044 /* We force a fake state transition here. Otherwise, the unit would go directly from
2045 * SERVICE_DEAD to SERVICE_DEAD without SERVICE_ACTIVATING or SERVICE_ACTIVE
2046 * inbetween. This way we can later trigger actions that depend on the state
2047 * transition, including SuccessAction=. */
2048 service_set_state(s, SERVICE_START);
2049
2050 service_enter_start_post(s);
2051 return;
2052 }
2053
2054 if (IN_SET(s->type, SERVICE_SIMPLE, SERVICE_IDLE))
2055 /* For simple + idle this is the main process. We don't apply any timeout here, but
2056 * service_enter_running() will later apply the .runtime_max_usec timeout. */
2057 timeout = USEC_INFINITY;
2058 else
2059 timeout = s->timeout_start_usec;
2060
2061 r = service_spawn(s,
2062 c,
2063 timeout,
2064 EXEC_PASS_FDS|EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN|EXEC_SET_WATCHDOG,
2065 &pid);
2066 if (r < 0)
2067 goto fail;
2068
2069 if (IN_SET(s->type, SERVICE_SIMPLE, SERVICE_IDLE)) {
2070 /* For simple services we immediately start
2071 * the START_POST binaries. */
2072
2073 service_set_main_pid(s, pid);
2074 service_enter_start_post(s);
2075
2076 } else if (s->type == SERVICE_FORKING) {
2077
2078 /* For forking services we wait until the start
2079 * process exited. */
2080
2081 s->control_pid = pid;
2082 service_set_state(s, SERVICE_START);
2083
2084 } else if (IN_SET(s->type, SERVICE_ONESHOT, SERVICE_DBUS, SERVICE_NOTIFY, SERVICE_EXEC)) {
2085
2086 /* For oneshot services we wait until the start process exited, too, but it is our main process. */
2087
2088 /* For D-Bus services we know the main pid right away, but wait for the bus name to appear on the
2089 * bus. 'notify' and 'exec' services are similar. */
2090
2091 service_set_main_pid(s, pid);
2092 service_set_state(s, SERVICE_START);
2093 } else
2094 assert_not_reached("Unknown service type");
2095
2096 return;
2097
2098 fail:
2099 log_unit_warning_errno(UNIT(s), r, "Failed to run 'start' task: %m");
2100 service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_FAILURE_RESOURCES);
2101 }
2102
2103 static void service_enter_start_pre(Service *s) {
2104 int r;
2105
2106 assert(s);
2107
2108 service_unwatch_control_pid(s);
2109
2110 s->control_command = s->exec_command[SERVICE_EXEC_START_PRE];
2111 if (s->control_command) {
2112
2113 unit_warn_leftover_processes(UNIT(s));
2114
2115 s->control_command_id = SERVICE_EXEC_START_PRE;
2116
2117 r = service_spawn(s,
2118 s->control_command,
2119 s->timeout_start_usec,
2120 EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_IS_CONTROL|EXEC_APPLY_TTY_STDIN,
2121 &s->control_pid);
2122 if (r < 0)
2123 goto fail;
2124
2125 service_set_state(s, SERVICE_START_PRE);
2126 } else
2127 service_enter_start(s);
2128
2129 return;
2130
2131 fail:
2132 log_unit_warning_errno(UNIT(s), r, "Failed to run 'start-pre' task: %m");
2133 service_enter_dead(s, SERVICE_FAILURE_RESOURCES, true);
2134 }
2135
2136 static void service_enter_restart(Service *s) {
2137 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
2138 int r;
2139
2140 assert(s);
2141
2142 if (UNIT(s)->job && UNIT(s)->job->type == JOB_STOP) {
2143 /* Don't restart things if we are going down anyway */
2144 log_unit_info(UNIT(s), "Stop job pending for unit, delaying automatic restart.");
2145
2146 r = service_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->restart_usec));
2147 if (r < 0)
2148 goto fail;
2149
2150 return;
2151 }
2152
2153 /* Any units that are bound to this service must also be
2154 * restarted. We use JOB_RESTART (instead of the more obvious
2155 * JOB_START) here so that those dependency jobs will be added
2156 * as well. */
2157 r = manager_add_job(UNIT(s)->manager, JOB_RESTART, UNIT(s), JOB_FAIL, &error, NULL);
2158 if (r < 0)
2159 goto fail;
2160
2161 /* Count the jobs we enqueue for restarting. This counter is maintained as long as the unit isn't fully
2162 * stopped, i.e. as long as it remains up or remains in auto-start states. The use can reset the counter
2163 * explicitly however via the usual "systemctl reset-failure" logic. */
2164 s->n_restarts ++;
2165 s->flush_n_restarts = false;
2166
2167 log_struct(LOG_INFO,
2168 "MESSAGE_ID=" SD_MESSAGE_UNIT_RESTART_SCHEDULED_STR,
2169 LOG_UNIT_ID(UNIT(s)),
2170 LOG_UNIT_INVOCATION_ID(UNIT(s)),
2171 LOG_UNIT_MESSAGE(UNIT(s), "Scheduled restart job, restart counter is at %u.", s->n_restarts),
2172 "N_RESTARTS=%u", s->n_restarts);
2173
2174 /* Notify clients about changed restart counter */
2175 unit_add_to_dbus_queue(UNIT(s));
2176
2177 /* Note that we stay in the SERVICE_AUTO_RESTART state here,
2178 * it will be canceled as part of the service_stop() call that
2179 * is executed as part of JOB_RESTART. */
2180
2181 return;
2182
2183 fail:
2184 log_unit_warning(UNIT(s), "Failed to schedule restart job: %s", bus_error_message(&error, -r));
2185 service_enter_dead(s, SERVICE_FAILURE_RESOURCES, false);
2186 }
2187
2188 static void service_enter_reload_by_notify(Service *s) {
2189 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
2190 int r;
2191
2192 assert(s);
2193
2194 service_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_start_usec));
2195 service_set_state(s, SERVICE_RELOAD);
2196
2197 /* service_enter_reload_by_notify is never called during a reload, thus no loops are possible. */
2198 r = manager_propagate_reload(UNIT(s)->manager, UNIT(s), JOB_FAIL, &error);
2199 if (r < 0)
2200 log_unit_warning(UNIT(s), "Failed to schedule propagation of reload: %s", bus_error_message(&error, -r));
2201 }
2202
2203 static void service_enter_reload(Service *s) {
2204 int r;
2205
2206 assert(s);
2207
2208 service_unwatch_control_pid(s);
2209 s->reload_result = SERVICE_SUCCESS;
2210
2211 s->control_command = s->exec_command[SERVICE_EXEC_RELOAD];
2212 if (s->control_command) {
2213 s->control_command_id = SERVICE_EXEC_RELOAD;
2214
2215 r = service_spawn(s,
2216 s->control_command,
2217 s->timeout_start_usec,
2218 EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_IS_CONTROL|EXEC_CONTROL_CGROUP,
2219 &s->control_pid);
2220 if (r < 0)
2221 goto fail;
2222
2223 service_set_state(s, SERVICE_RELOAD);
2224 } else
2225 service_enter_running(s, SERVICE_SUCCESS);
2226
2227 return;
2228
2229 fail:
2230 log_unit_warning_errno(UNIT(s), r, "Failed to run 'reload' task: %m");
2231 s->reload_result = SERVICE_FAILURE_RESOURCES;
2232 service_enter_running(s, SERVICE_SUCCESS);
2233 }
2234
2235 static void service_run_next_control(Service *s) {
2236 usec_t timeout;
2237 int r;
2238
2239 assert(s);
2240 assert(s->control_command);
2241 assert(s->control_command->command_next);
2242
2243 assert(s->control_command_id != SERVICE_EXEC_START);
2244
2245 s->control_command = s->control_command->command_next;
2246 service_unwatch_control_pid(s);
2247
2248 if (IN_SET(s->state, SERVICE_START_PRE, SERVICE_START, SERVICE_START_POST, SERVICE_RUNNING, SERVICE_RELOAD))
2249 timeout = s->timeout_start_usec;
2250 else
2251 timeout = s->timeout_stop_usec;
2252
2253 r = service_spawn(s,
2254 s->control_command,
2255 timeout,
2256 EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_IS_CONTROL|
2257 (IN_SET(s->control_command_id, SERVICE_EXEC_START_PRE, SERVICE_EXEC_STOP_POST) ? EXEC_APPLY_TTY_STDIN : 0)|
2258 (IN_SET(s->control_command_id, SERVICE_EXEC_STOP, SERVICE_EXEC_STOP_POST) ? EXEC_SETENV_RESULT : 0)|
2259 (IN_SET(s->control_command_id, SERVICE_EXEC_START_POST, SERVICE_EXEC_RELOAD, SERVICE_EXEC_STOP, SERVICE_EXEC_STOP_POST) ? EXEC_CONTROL_CGROUP : 0),
2260 &s->control_pid);
2261 if (r < 0)
2262 goto fail;
2263
2264 return;
2265
2266 fail:
2267 log_unit_warning_errno(UNIT(s), r, "Failed to run next control task: %m");
2268
2269 if (IN_SET(s->state, SERVICE_START_PRE, SERVICE_START_POST, SERVICE_STOP))
2270 service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_FAILURE_RESOURCES);
2271 else if (s->state == SERVICE_STOP_POST)
2272 service_enter_dead(s, SERVICE_FAILURE_RESOURCES, true);
2273 else if (s->state == SERVICE_RELOAD) {
2274 s->reload_result = SERVICE_FAILURE_RESOURCES;
2275 service_enter_running(s, SERVICE_SUCCESS);
2276 } else
2277 service_enter_stop(s, SERVICE_FAILURE_RESOURCES);
2278 }
2279
2280 static void service_run_next_main(Service *s) {
2281 pid_t pid;
2282 int r;
2283
2284 assert(s);
2285 assert(s->main_command);
2286 assert(s->main_command->command_next);
2287 assert(s->type == SERVICE_ONESHOT);
2288
2289 s->main_command = s->main_command->command_next;
2290 service_unwatch_main_pid(s);
2291
2292 r = service_spawn(s,
2293 s->main_command,
2294 s->timeout_start_usec,
2295 EXEC_PASS_FDS|EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN|EXEC_SET_WATCHDOG,
2296 &pid);
2297 if (r < 0)
2298 goto fail;
2299
2300 service_set_main_pid(s, pid);
2301
2302 return;
2303
2304 fail:
2305 log_unit_warning_errno(UNIT(s), r, "Failed to run next main task: %m");
2306 service_enter_stop(s, SERVICE_FAILURE_RESOURCES);
2307 }
2308
2309 static int service_start(Unit *u) {
2310 Service *s = SERVICE(u);
2311 int r;
2312
2313 assert(s);
2314
2315 /* We cannot fulfill this request right now, try again later
2316 * please! */
2317 if (IN_SET(s->state,
2318 SERVICE_STOP, SERVICE_STOP_WATCHDOG, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL, SERVICE_STOP_POST,
2319 SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL))
2320 return -EAGAIN;
2321
2322 /* Already on it! */
2323 if (IN_SET(s->state, SERVICE_START_PRE, SERVICE_START, SERVICE_START_POST))
2324 return 0;
2325
2326 /* A service that will be restarted must be stopped first to
2327 * trigger BindsTo and/or OnFailure dependencies. If a user
2328 * does not want to wait for the holdoff time to elapse, the
2329 * service should be manually restarted, not started. We
2330 * simply return EAGAIN here, so that any start jobs stay
2331 * queued, and assume that the auto restart timer will
2332 * eventually trigger the restart. */
2333 if (s->state == SERVICE_AUTO_RESTART)
2334 return -EAGAIN;
2335
2336 assert(IN_SET(s->state, SERVICE_DEAD, SERVICE_FAILED));
2337
2338 /* Make sure we don't enter a busy loop of some kind. */
2339 r = unit_start_limit_test(u);
2340 if (r < 0) {
2341 service_enter_dead(s, SERVICE_FAILURE_START_LIMIT_HIT, false);
2342 return r;
2343 }
2344
2345 r = unit_acquire_invocation_id(u);
2346 if (r < 0)
2347 return r;
2348
2349 s->result = SERVICE_SUCCESS;
2350 s->reload_result = SERVICE_SUCCESS;
2351 s->main_pid_known = false;
2352 s->main_pid_alien = false;
2353 s->forbid_restart = false;
2354
2355 s->status_text = mfree(s->status_text);
2356 s->status_errno = 0;
2357
2358 s->notify_state = NOTIFY_UNKNOWN;
2359
2360 s->watchdog_original_usec = s->watchdog_usec;
2361 s->watchdog_override_enable = false;
2362 s->watchdog_override_usec = USEC_INFINITY;
2363
2364 exec_command_reset_status_list_array(s->exec_command, _SERVICE_EXEC_COMMAND_MAX);
2365 exec_status_reset(&s->main_exec_status);
2366
2367 /* This is not an automatic restart? Flush the restart counter then */
2368 if (s->flush_n_restarts) {
2369 s->n_restarts = 0;
2370 s->flush_n_restarts = false;
2371 }
2372
2373 u->reset_accounting = true;
2374
2375 service_enter_start_pre(s);
2376 return 1;
2377 }
2378
2379 static int service_stop(Unit *u) {
2380 Service *s = SERVICE(u);
2381
2382 assert(s);
2383
2384 /* Don't create restart jobs from manual stops. */
2385 s->forbid_restart = true;
2386
2387 /* Already on it */
2388 if (IN_SET(s->state,
2389 SERVICE_STOP, SERVICE_STOP_WATCHDOG, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL, SERVICE_STOP_POST,
2390 SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL))
2391 return 0;
2392
2393 /* A restart will be scheduled or is in progress. */
2394 if (s->state == SERVICE_AUTO_RESTART) {
2395 service_set_state(s, SERVICE_DEAD);
2396 return 0;
2397 }
2398
2399 /* If there's already something running we go directly into
2400 * kill mode. */
2401 if (IN_SET(s->state, SERVICE_START_PRE, SERVICE_START, SERVICE_START_POST, SERVICE_RELOAD)) {
2402 service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_SUCCESS);
2403 return 0;
2404 }
2405
2406 assert(IN_SET(s->state, SERVICE_RUNNING, SERVICE_EXITED));
2407
2408 service_enter_stop(s, SERVICE_SUCCESS);
2409 return 1;
2410 }
2411
2412 static int service_reload(Unit *u) {
2413 Service *s = SERVICE(u);
2414
2415 assert(s);
2416
2417 assert(IN_SET(s->state, SERVICE_RUNNING, SERVICE_EXITED));
2418
2419 service_enter_reload(s);
2420 return 1;
2421 }
2422
2423 _pure_ static bool service_can_reload(Unit *u) {
2424 Service *s = SERVICE(u);
2425
2426 assert(s);
2427
2428 return !!s->exec_command[SERVICE_EXEC_RELOAD];
2429 }
2430
2431 static unsigned service_exec_command_index(Unit *u, ServiceExecCommand id, ExecCommand *current) {
2432 Service *s = SERVICE(u);
2433 unsigned idx = 0;
2434 ExecCommand *first, *c;
2435
2436 assert(s);
2437
2438 first = s->exec_command[id];
2439
2440 /* Figure out where we are in the list by walking back to the beginning */
2441 for (c = current; c != first; c = c->command_prev)
2442 idx++;
2443
2444 return idx;
2445 }
2446
2447 static int service_serialize_exec_command(Unit *u, FILE *f, ExecCommand *command) {
2448 _cleanup_free_ char *args = NULL, *p = NULL;
2449 size_t allocated = 0, length = 0;
2450 Service *s = SERVICE(u);
2451 const char *type, *key;
2452 ServiceExecCommand id;
2453 unsigned idx;
2454 char **arg;
2455
2456 assert(s);
2457 assert(f);
2458
2459 if (!command)
2460 return 0;
2461
2462 if (command == s->control_command) {
2463 type = "control";
2464 id = s->control_command_id;
2465 } else {
2466 type = "main";
2467 id = SERVICE_EXEC_START;
2468 }
2469
2470 idx = service_exec_command_index(u, id, command);
2471
2472 STRV_FOREACH(arg, command->argv) {
2473 _cleanup_free_ char *e = NULL;
2474 size_t n;
2475
2476 e = cescape(*arg);
2477 if (!e)
2478 return log_oom();
2479
2480 n = strlen(e);
2481 if (!GREEDY_REALLOC(args, allocated, length + 1 + n + 1))
2482 return log_oom();
2483
2484 if (length > 0)
2485 args[length++] = ' ';
2486
2487 memcpy(args + length, e, n);
2488 length += n;
2489 }
2490
2491 if (!GREEDY_REALLOC(args, allocated, length + 1))
2492 return log_oom();
2493
2494 args[length++] = 0;
2495
2496 p = cescape(command->path);
2497 if (!p)
2498 return -ENOMEM;
2499
2500 key = strjoina(type, "-command");
2501 return serialize_item_format(f, key, "%s %u %s %s", service_exec_command_to_string(id), idx, p, args);
2502 }
2503
2504 static int service_serialize(Unit *u, FILE *f, FDSet *fds) {
2505 Service *s = SERVICE(u);
2506 ServiceFDStore *fs;
2507 int r;
2508
2509 assert(u);
2510 assert(f);
2511 assert(fds);
2512
2513 (void) serialize_item(f, "state", service_state_to_string(s->state));
2514 (void) serialize_item(f, "result", service_result_to_string(s->result));
2515 (void) serialize_item(f, "reload-result", service_result_to_string(s->reload_result));
2516
2517 if (s->control_pid > 0)
2518 (void) serialize_item_format(f, "control-pid", PID_FMT, s->control_pid);
2519
2520 if (s->main_pid_known && s->main_pid > 0)
2521 (void) serialize_item_format(f, "main-pid", PID_FMT, s->main_pid);
2522
2523 (void) serialize_bool(f, "main-pid-known", s->main_pid_known);
2524 (void) serialize_bool(f, "bus-name-good", s->bus_name_good);
2525 (void) serialize_bool(f, "bus-name-owner", s->bus_name_owner);
2526
2527 (void) serialize_item_format(f, "n-restarts", "%u", s->n_restarts);
2528 (void) serialize_bool(f, "flush-n-restarts", s->flush_n_restarts);
2529
2530 r = serialize_item_escaped(f, "status-text", s->status_text);
2531 if (r < 0)
2532 return r;
2533
2534 service_serialize_exec_command(u, f, s->control_command);
2535 service_serialize_exec_command(u, f, s->main_command);
2536
2537 r = serialize_fd(f, fds, "stdin-fd", s->stdin_fd);
2538 if (r < 0)
2539 return r;
2540 r = serialize_fd(f, fds, "stdout-fd", s->stdout_fd);
2541 if (r < 0)
2542 return r;
2543 r = serialize_fd(f, fds, "stderr-fd", s->stderr_fd);
2544 if (r < 0)
2545 return r;
2546
2547 if (s->exec_fd_event_source) {
2548 r = serialize_fd(f, fds, "exec-fd", sd_event_source_get_io_fd(s->exec_fd_event_source));
2549 if (r < 0)
2550 return r;
2551
2552 (void) serialize_bool(f, "exec-fd-hot", s->exec_fd_hot);
2553 }
2554
2555 if (UNIT_ISSET(s->accept_socket)) {
2556 r = serialize_item(f, "accept-socket", UNIT_DEREF(s->accept_socket)->id);
2557 if (r < 0)
2558 return r;
2559 }
2560
2561 r = serialize_fd(f, fds, "socket-fd", s->socket_fd);
2562 if (r < 0)
2563 return r;
2564
2565 LIST_FOREACH(fd_store, fs, s->fd_store) {
2566 _cleanup_free_ char *c = NULL;
2567 int copy;
2568
2569 copy = fdset_put_dup(fds, fs->fd);
2570 if (copy < 0)
2571 return log_error_errno(copy, "Failed to copy file descriptor for serialization: %m");
2572
2573 c = cescape(fs->fdname);
2574 if (!c)
2575 return log_oom();
2576
2577 (void) serialize_item_format(f, "fd-store-fd", "%i %s", copy, c);
2578 }
2579
2580 if (s->main_exec_status.pid > 0) {
2581 (void) serialize_item_format(f, "main-exec-status-pid", PID_FMT, s->main_exec_status.pid);
2582 (void) serialize_dual_timestamp(f, "main-exec-status-start", &s->main_exec_status.start_timestamp);
2583 (void) serialize_dual_timestamp(f, "main-exec-status-exit", &s->main_exec_status.exit_timestamp);
2584
2585 if (dual_timestamp_is_set(&s->main_exec_status.exit_timestamp)) {
2586 (void) serialize_item_format(f, "main-exec-status-code", "%i", s->main_exec_status.code);
2587 (void) serialize_item_format(f, "main-exec-status-status", "%i", s->main_exec_status.status);
2588 }
2589 }
2590
2591 (void) serialize_dual_timestamp(f, "watchdog-timestamp", &s->watchdog_timestamp);
2592 (void) serialize_bool(f, "forbid-restart", s->forbid_restart);
2593
2594 if (s->watchdog_override_enable)
2595 (void) serialize_item_format(f, "watchdog-override-usec", USEC_FMT, s->watchdog_override_usec);
2596
2597 if (s->watchdog_original_usec != USEC_INFINITY)
2598 (void) serialize_item_format(f, "watchdog-original-usec", USEC_FMT, s->watchdog_original_usec);
2599
2600 return 0;
2601 }
2602
2603 static int service_deserialize_exec_command(Unit *u, const char *key, const char *value) {
2604 Service *s = SERVICE(u);
2605 int r;
2606 unsigned idx = 0, i;
2607 bool control, found = false;
2608 ServiceExecCommand id = _SERVICE_EXEC_COMMAND_INVALID;
2609 ExecCommand *command = NULL;
2610 _cleanup_free_ char *path = NULL;
2611 _cleanup_strv_free_ char **argv = NULL;
2612
2613 enum ExecCommandState {
2614 STATE_EXEC_COMMAND_TYPE,
2615 STATE_EXEC_COMMAND_INDEX,
2616 STATE_EXEC_COMMAND_PATH,
2617 STATE_EXEC_COMMAND_ARGS,
2618 _STATE_EXEC_COMMAND_MAX,
2619 _STATE_EXEC_COMMAND_INVALID = -1,
2620 } state;
2621
2622 assert(s);
2623 assert(key);
2624 assert(value);
2625
2626 control = streq(key, "control-command");
2627
2628 state = STATE_EXEC_COMMAND_TYPE;
2629
2630 for (;;) {
2631 _cleanup_free_ char *arg = NULL;
2632
2633 r = extract_first_word(&value, &arg, NULL, EXTRACT_CUNESCAPE);
2634 if (r < 0)
2635 return r;
2636 if (r == 0)
2637 break;
2638
2639 switch (state) {
2640 case STATE_EXEC_COMMAND_TYPE:
2641 id = service_exec_command_from_string(arg);
2642 if (id < 0)
2643 return -EINVAL;
2644
2645 state = STATE_EXEC_COMMAND_INDEX;
2646 break;
2647 case STATE_EXEC_COMMAND_INDEX:
2648 r = safe_atou(arg, &idx);
2649 if (r < 0)
2650 return -EINVAL;
2651
2652 state = STATE_EXEC_COMMAND_PATH;
2653 break;
2654 case STATE_EXEC_COMMAND_PATH:
2655 path = TAKE_PTR(arg);
2656 state = STATE_EXEC_COMMAND_ARGS;
2657
2658 if (!path_is_absolute(path))
2659 return -EINVAL;
2660 break;
2661 case STATE_EXEC_COMMAND_ARGS:
2662 r = strv_extend(&argv, arg);
2663 if (r < 0)
2664 return -ENOMEM;
2665 break;
2666 default:
2667 assert_not_reached("Unknown error at deserialization of exec command");
2668 break;
2669 }
2670 }
2671
2672 if (state != STATE_EXEC_COMMAND_ARGS)
2673 return -EINVAL;
2674
2675 /* Let's check whether exec command on given offset matches data that we just deserialized */
2676 for (command = s->exec_command[id], i = 0; command; command = command->command_next, i++) {
2677 if (i != idx)
2678 continue;
2679
2680 found = strv_equal(argv, command->argv) && streq(command->path, path);
2681 break;
2682 }
2683
2684 if (!found) {
2685 /* Command at the index we serialized is different, let's look for command that exactly
2686 * matches but is on different index. If there is no such command we will not resume execution. */
2687 for (command = s->exec_command[id]; command; command = command->command_next)
2688 if (strv_equal(command->argv, argv) && streq(command->path, path))
2689 break;
2690 }
2691
2692 if (command && control)
2693 s->control_command = command;
2694 else if (command)
2695 s->main_command = command;
2696 else
2697 log_unit_warning(u, "Current command vanished from the unit file, execution of the command list won't be resumed.");
2698
2699 return 0;
2700 }
2701
2702 static int service_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
2703 Service *s = SERVICE(u);
2704 int r;
2705
2706 assert(u);
2707 assert(key);
2708 assert(value);
2709 assert(fds);
2710
2711 if (streq(key, "state")) {
2712 ServiceState state;
2713
2714 state = service_state_from_string(value);
2715 if (state < 0)
2716 log_unit_debug(u, "Failed to parse state value: %s", value);
2717 else
2718 s->deserialized_state = state;
2719 } else if (streq(key, "result")) {
2720 ServiceResult f;
2721
2722 f = service_result_from_string(value);
2723 if (f < 0)
2724 log_unit_debug(u, "Failed to parse result value: %s", value);
2725 else if (f != SERVICE_SUCCESS)
2726 s->result = f;
2727
2728 } else if (streq(key, "reload-result")) {
2729 ServiceResult f;
2730
2731 f = service_result_from_string(value);
2732 if (f < 0)
2733 log_unit_debug(u, "Failed to parse reload result value: %s", value);
2734 else if (f != SERVICE_SUCCESS)
2735 s->reload_result = f;
2736
2737 } else if (streq(key, "control-pid")) {
2738 pid_t pid;
2739
2740 if (parse_pid(value, &pid) < 0)
2741 log_unit_debug(u, "Failed to parse control-pid value: %s", value);
2742 else
2743 s->control_pid = pid;
2744 } else if (streq(key, "main-pid")) {
2745 pid_t pid;
2746
2747 if (parse_pid(value, &pid) < 0)
2748 log_unit_debug(u, "Failed to parse main-pid value: %s", value);
2749 else
2750 (void) service_set_main_pid(s, pid);
2751 } else if (streq(key, "main-pid-known")) {
2752 int b;
2753
2754 b = parse_boolean(value);
2755 if (b < 0)
2756 log_unit_debug(u, "Failed to parse main-pid-known value: %s", value);
2757 else
2758 s->main_pid_known = b;
2759 } else if (streq(key, "bus-name-good")) {
2760 int b;
2761
2762 b = parse_boolean(value);
2763 if (b < 0)
2764 log_unit_debug(u, "Failed to parse bus-name-good value: %s", value);
2765 else
2766 s->bus_name_good = b;
2767 } else if (streq(key, "bus-name-owner")) {
2768 r = free_and_strdup(&s->bus_name_owner, value);
2769 if (r < 0)
2770 log_unit_error_errno(u, r, "Unable to deserialize current bus owner %s: %m", value);
2771 } else if (streq(key, "status-text")) {
2772 char *t;
2773
2774 r = cunescape(value, 0, &t);
2775 if (r < 0)
2776 log_unit_debug_errno(u, r, "Failed to unescape status text '%s': %m", value);
2777 else
2778 free_and_replace(s->status_text, t);
2779
2780 } else if (streq(key, "accept-socket")) {
2781 Unit *socket;
2782
2783 r = manager_load_unit(u->manager, value, NULL, NULL, &socket);
2784 if (r < 0)
2785 log_unit_debug_errno(u, r, "Failed to load accept-socket unit '%s': %m", value);
2786 else {
2787 unit_ref_set(&s->accept_socket, u, socket);
2788 SOCKET(socket)->n_connections++;
2789 }
2790
2791 } else if (streq(key, "socket-fd")) {
2792 int fd;
2793
2794 if (safe_atoi(value, &fd) < 0 || fd < 0 || !fdset_contains(fds, fd))
2795 log_unit_debug(u, "Failed to parse socket-fd value: %s", value);
2796 else {
2797 asynchronous_close(s->socket_fd);
2798 s->socket_fd = fdset_remove(fds, fd);
2799 }
2800 } else if (streq(key, "fd-store-fd")) {
2801 const char *fdv;
2802 size_t pf;
2803 int fd;
2804
2805 pf = strcspn(value, WHITESPACE);
2806 fdv = strndupa(value, pf);
2807
2808 if (safe_atoi(fdv, &fd) < 0 || fd < 0 || !fdset_contains(fds, fd))
2809 log_unit_debug(u, "Failed to parse fd-store-fd value: %s", value);
2810 else {
2811 _cleanup_free_ char *t = NULL;
2812 const char *fdn;
2813
2814 fdn = value + pf;
2815 fdn += strspn(fdn, WHITESPACE);
2816 (void) cunescape(fdn, 0, &t);
2817
2818 r = service_add_fd_store(s, fd, t);
2819 if (r < 0)
2820 log_unit_error_errno(u, r, "Failed to add fd to store: %m");
2821 else
2822 fdset_remove(fds, fd);
2823 }
2824
2825 } else if (streq(key, "main-exec-status-pid")) {
2826 pid_t pid;
2827
2828 if (parse_pid(value, &pid) < 0)
2829 log_unit_debug(u, "Failed to parse main-exec-status-pid value: %s", value);
2830 else
2831 s->main_exec_status.pid = pid;
2832 } else if (streq(key, "main-exec-status-code")) {
2833 int i;
2834
2835 if (safe_atoi(value, &i) < 0)
2836 log_unit_debug(u, "Failed to parse main-exec-status-code value: %s", value);
2837 else
2838 s->main_exec_status.code = i;
2839 } else if (streq(key, "main-exec-status-status")) {
2840 int i;
2841
2842 if (safe_atoi(value, &i) < 0)
2843 log_unit_debug(u, "Failed to parse main-exec-status-status value: %s", value);
2844 else
2845 s->main_exec_status.status = i;
2846 } else if (streq(key, "main-exec-status-start"))
2847 deserialize_dual_timestamp(value, &s->main_exec_status.start_timestamp);
2848 else if (streq(key, "main-exec-status-exit"))
2849 deserialize_dual_timestamp(value, &s->main_exec_status.exit_timestamp);
2850 else if (streq(key, "watchdog-timestamp"))
2851 deserialize_dual_timestamp(value, &s->watchdog_timestamp);
2852 else if (streq(key, "forbid-restart")) {
2853 int b;
2854
2855 b = parse_boolean(value);
2856 if (b < 0)
2857 log_unit_debug(u, "Failed to parse forbid-restart value: %s", value);
2858 else
2859 s->forbid_restart = b;
2860 } else if (streq(key, "stdin-fd")) {
2861 int fd;
2862
2863 if (safe_atoi(value, &fd) < 0 || fd < 0 || !fdset_contains(fds, fd))
2864 log_unit_debug(u, "Failed to parse stdin-fd value: %s", value);
2865 else {
2866 asynchronous_close(s->stdin_fd);
2867 s->stdin_fd = fdset_remove(fds, fd);
2868 s->exec_context.stdio_as_fds = true;
2869 }
2870 } else if (streq(key, "stdout-fd")) {
2871 int fd;
2872
2873 if (safe_atoi(value, &fd) < 0 || fd < 0 || !fdset_contains(fds, fd))
2874 log_unit_debug(u, "Failed to parse stdout-fd value: %s", value);
2875 else {
2876 asynchronous_close(s->stdout_fd);
2877 s->stdout_fd = fdset_remove(fds, fd);
2878 s->exec_context.stdio_as_fds = true;
2879 }
2880 } else if (streq(key, "stderr-fd")) {
2881 int fd;
2882
2883 if (safe_atoi(value, &fd) < 0 || fd < 0 || !fdset_contains(fds, fd))
2884 log_unit_debug(u, "Failed to parse stderr-fd value: %s", value);
2885 else {
2886 asynchronous_close(s->stderr_fd);
2887 s->stderr_fd = fdset_remove(fds, fd);
2888 s->exec_context.stdio_as_fds = true;
2889 }
2890 } else if (streq(key, "exec-fd")) {
2891 int fd;
2892
2893 if (safe_atoi(value, &fd) < 0 || fd < 0 || !fdset_contains(fds, fd))
2894 log_unit_debug(u, "Failed to parse exec-fd value: %s", value);
2895 else {
2896 s->exec_fd_event_source = sd_event_source_unref(s->exec_fd_event_source);
2897
2898 fd = fdset_remove(fds, fd);
2899 if (service_allocate_exec_fd_event_source(s, fd, &s->exec_fd_event_source) < 0)
2900 safe_close(fd);
2901 }
2902 } else if (streq(key, "watchdog-override-usec")) {
2903 if (deserialize_usec(value, &s->watchdog_override_usec) < 0)
2904 log_unit_debug(u, "Failed to parse watchdog_override_usec value: %s", value);
2905 else
2906 s->watchdog_override_enable = true;
2907
2908 } else if (streq(key, "watchdog-original-usec")) {
2909 if (deserialize_usec(value, &s->watchdog_original_usec) < 0)
2910 log_unit_debug(u, "Failed to parse watchdog_original_usec value: %s", value);
2911
2912 } else if (STR_IN_SET(key, "main-command", "control-command")) {
2913 r = service_deserialize_exec_command(u, key, value);
2914 if (r < 0)
2915 log_unit_debug_errno(u, r, "Failed to parse serialized command \"%s\": %m", value);
2916
2917 } else if (streq(key, "n-restarts")) {
2918 r = safe_atou(value, &s->n_restarts);
2919 if (r < 0)
2920 log_unit_debug_errno(u, r, "Failed to parse serialized restart counter '%s': %m", value);
2921
2922 } else if (streq(key, "flush-n-restarts")) {
2923 r = parse_boolean(value);
2924 if (r < 0)
2925 log_unit_debug_errno(u, r, "Failed to parse serialized flush restart counter setting '%s': %m", value);
2926 else
2927 s->flush_n_restarts = r;
2928 } else
2929 log_unit_debug(u, "Unknown serialization key: %s", key);
2930
2931 return 0;
2932 }
2933
2934 _pure_ static UnitActiveState service_active_state(Unit *u) {
2935 const UnitActiveState *table;
2936
2937 assert(u);
2938
2939 table = SERVICE(u)->type == SERVICE_IDLE ? state_translation_table_idle : state_translation_table;
2940
2941 return table[SERVICE(u)->state];
2942 }
2943
2944 static const char *service_sub_state_to_string(Unit *u) {
2945 assert(u);
2946
2947 return service_state_to_string(SERVICE(u)->state);
2948 }
2949
2950 static bool service_may_gc(Unit *u) {
2951 Service *s = SERVICE(u);
2952
2953 assert(s);
2954
2955 /* Never clean up services that still have a process around, even if the service is formally dead. Note that
2956 * unit_may_gc() already checked our cgroup for us, we just check our two additional PIDs, too, in case they
2957 * have moved outside of the cgroup. */
2958
2959 if (main_pid_good(s) > 0 ||
2960 control_pid_good(s) > 0)
2961 return false;
2962
2963 return true;
2964 }
2965
2966 static int service_retry_pid_file(Service *s) {
2967 int r;
2968
2969 assert(s->pid_file);
2970 assert(IN_SET(s->state, SERVICE_START, SERVICE_START_POST));
2971
2972 r = service_load_pid_file(s, false);
2973 if (r < 0)
2974 return r;
2975
2976 service_unwatch_pid_file(s);
2977
2978 service_enter_running(s, SERVICE_SUCCESS);
2979 return 0;
2980 }
2981
2982 static int service_watch_pid_file(Service *s) {
2983 int r;
2984
2985 log_unit_debug(UNIT(s), "Setting watch for PID file %s", s->pid_file_pathspec->path);
2986
2987 r = path_spec_watch(s->pid_file_pathspec, service_dispatch_inotify_io);
2988 if (r < 0)
2989 goto fail;
2990
2991 /* the pidfile might have appeared just before we set the watch */
2992 log_unit_debug(UNIT(s), "Trying to read PID file %s in case it changed", s->pid_file_pathspec->path);
2993 service_retry_pid_file(s);
2994
2995 return 0;
2996 fail:
2997 log_unit_error_errno(UNIT(s), r, "Failed to set a watch for PID file %s: %m", s->pid_file_pathspec->path);
2998 service_unwatch_pid_file(s);
2999 return r;
3000 }
3001
3002 static int service_demand_pid_file(Service *s) {
3003 PathSpec *ps;
3004
3005 assert(s->pid_file);
3006 assert(!s->pid_file_pathspec);
3007
3008 ps = new0(PathSpec, 1);
3009 if (!ps)
3010 return -ENOMEM;
3011
3012 ps->unit = UNIT(s);
3013 ps->path = strdup(s->pid_file);
3014 if (!ps->path) {
3015 free(ps);
3016 return -ENOMEM;
3017 }
3018
3019 path_simplify(ps->path, false);
3020
3021 /* PATH_CHANGED would not be enough. There are daemons (sendmail) that
3022 * keep their PID file open all the time. */
3023 ps->type = PATH_MODIFIED;
3024 ps->inotify_fd = -1;
3025
3026 s->pid_file_pathspec = ps;
3027
3028 return service_watch_pid_file(s);
3029 }
3030
3031 static int service_dispatch_inotify_io(sd_event_source *source, int fd, uint32_t events, void *userdata) {
3032 PathSpec *p = userdata;
3033 Service *s;
3034
3035 assert(p);
3036
3037 s = SERVICE(p->unit);
3038
3039 assert(s);
3040 assert(fd >= 0);
3041 assert(IN_SET(s->state, SERVICE_START, SERVICE_START_POST));
3042 assert(s->pid_file_pathspec);
3043 assert(path_spec_owns_inotify_fd(s->pid_file_pathspec, fd));
3044
3045 log_unit_debug(UNIT(s), "inotify event");
3046
3047 if (path_spec_fd_event(p, events) < 0)
3048 goto fail;
3049
3050 if (service_retry_pid_file(s) == 0)
3051 return 0;
3052
3053 if (service_watch_pid_file(s) < 0)
3054 goto fail;
3055
3056 return 0;
3057
3058 fail:
3059 service_unwatch_pid_file(s);
3060 service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_FAILURE_RESOURCES);
3061 return 0;
3062 }
3063
3064 static int service_dispatch_exec_io(sd_event_source *source, int fd, uint32_t events, void *userdata) {
3065 Service *s = SERVICE(userdata);
3066
3067 assert(s);
3068
3069 log_unit_debug(UNIT(s), "got exec-fd event");
3070
3071 /* If Type=exec is set, we'll consider a service started successfully the instant we invoked execve()
3072 * successfully for it. We implement this through a pipe() towards the child, which the kernel automatically
3073 * closes for us due to O_CLOEXEC on execve() in the child, which then triggers EOF on the pipe in the
3074 * parent. We need to be careful however, as there are other reasons that we might cause the child's side of
3075 * the pipe to be closed (for example, a simple exit()). To deal with that we'll ignore EOFs on the pipe unless
3076 * the child signalled us first that it is about to call the execve(). It does so by sending us a simple
3077 * non-zero byte via the pipe. We also provide the child with a way to inform us in case execve() failed: if it
3078 * sends a zero byte we'll ignore POLLHUP on the fd again. */
3079
3080 for (;;) {
3081 uint8_t x;
3082 ssize_t n;
3083
3084 n = read(fd, &x, sizeof(x));
3085 if (n < 0) {
3086 if (errno == EAGAIN) /* O_NONBLOCK in effect → everything queued has now been processed. */
3087 return 0;
3088
3089 return log_unit_error_errno(UNIT(s), errno, "Failed to read from exec_fd: %m");
3090 }
3091 if (n == 0) { /* EOF → the event we are waiting for */
3092
3093 s->exec_fd_event_source = sd_event_source_unref(s->exec_fd_event_source);
3094
3095 if (s->exec_fd_hot) { /* Did the child tell us to expect EOF now? */
3096 log_unit_debug(UNIT(s), "Got EOF on exec-fd");
3097
3098 s->exec_fd_hot = false;
3099
3100 /* Nice! This is what we have been waiting for. Transition to next state. */
3101 if (s->type == SERVICE_EXEC && s->state == SERVICE_START)
3102 service_enter_start_post(s);
3103 } else
3104 log_unit_debug(UNIT(s), "Got EOF on exec-fd while it was disabled, ignoring.");
3105
3106 return 0;
3107 }
3108
3109 /* A byte was read → this turns on/off the exec fd logic */
3110 assert(n == sizeof(x));
3111 s->exec_fd_hot = x;
3112 }
3113
3114 return 0;
3115 }
3116
3117 static void service_notify_cgroup_empty_event(Unit *u) {
3118 Service *s = SERVICE(u);
3119
3120 assert(u);
3121
3122 log_unit_debug(u, "cgroup is empty");
3123
3124 switch (s->state) {
3125
3126 /* Waiting for SIGCHLD is usually more interesting,
3127 * because it includes return codes/signals. Which is
3128 * why we ignore the cgroup events for most cases,
3129 * except when we don't know pid which to expect the
3130 * SIGCHLD for. */
3131
3132 case SERVICE_START:
3133 if (s->type == SERVICE_NOTIFY &&
3134 main_pid_good(s) == 0 &&
3135 control_pid_good(s) == 0) {
3136 /* No chance of getting a ready notification anymore */
3137 service_enter_stop_post(s, SERVICE_FAILURE_PROTOCOL);
3138 break;
3139 }
3140
3141 _fallthrough_;
3142 case SERVICE_START_POST:
3143 if (s->pid_file_pathspec &&
3144 main_pid_good(s) == 0 &&
3145 control_pid_good(s) == 0) {
3146
3147 /* Give up hoping for the daemon to write its PID file */
3148 log_unit_warning(u, "Daemon never wrote its PID file. Failing.");
3149
3150 service_unwatch_pid_file(s);
3151 if (s->state == SERVICE_START)
3152 service_enter_stop_post(s, SERVICE_FAILURE_PROTOCOL);
3153 else
3154 service_enter_stop(s, SERVICE_FAILURE_PROTOCOL);
3155 }
3156 break;
3157
3158 case SERVICE_RUNNING:
3159 /* service_enter_running() will figure out what to do */
3160 service_enter_running(s, SERVICE_SUCCESS);
3161 break;
3162
3163 case SERVICE_STOP_WATCHDOG:
3164 case SERVICE_STOP_SIGTERM:
3165 case SERVICE_STOP_SIGKILL:
3166
3167 if (main_pid_good(s) <= 0 && control_pid_good(s) <= 0)
3168 service_enter_stop_post(s, SERVICE_SUCCESS);
3169
3170 break;
3171
3172 case SERVICE_STOP_POST:
3173 case SERVICE_FINAL_SIGTERM:
3174 case SERVICE_FINAL_SIGKILL:
3175 if (main_pid_good(s) <= 0 && control_pid_good(s) <= 0)
3176 service_enter_dead(s, SERVICE_SUCCESS, true);
3177
3178 break;
3179
3180 default:
3181 ;
3182 }
3183 }
3184
3185 static void service_sigchld_event(Unit *u, pid_t pid, int code, int status) {
3186 bool notify_dbus = true;
3187 Service *s = SERVICE(u);
3188 ServiceResult f;
3189
3190 assert(s);
3191 assert(pid >= 0);
3192
3193 if (is_clean_exit(code, status, s->type == SERVICE_ONESHOT ? EXIT_CLEAN_COMMAND : EXIT_CLEAN_DAEMON, &s->success_status))
3194 f = SERVICE_SUCCESS;
3195 else if (code == CLD_EXITED)
3196 f = SERVICE_FAILURE_EXIT_CODE;
3197 else if (code == CLD_KILLED)
3198 f = SERVICE_FAILURE_SIGNAL;
3199 else if (code == CLD_DUMPED)
3200 f = SERVICE_FAILURE_CORE_DUMP;
3201 else
3202 assert_not_reached("Unknown code");
3203
3204 if (s->main_pid == pid) {
3205 /* Forking services may occasionally move to a new PID.
3206 * As long as they update the PID file before exiting the old
3207 * PID, they're fine. */
3208 if (service_load_pid_file(s, false) > 0)
3209 return;
3210
3211 s->main_pid = 0;
3212 exec_status_exit(&s->main_exec_status, &s->exec_context, pid, code, status);
3213
3214 if (s->main_command) {
3215 /* If this is not a forking service than the
3216 * main process got started and hence we copy
3217 * the exit status so that it is recorded both
3218 * as main and as control process exit
3219 * status */
3220
3221 s->main_command->exec_status = s->main_exec_status;
3222
3223 if (s->main_command->flags & EXEC_COMMAND_IGNORE_FAILURE)
3224 f = SERVICE_SUCCESS;
3225 } else if (s->exec_command[SERVICE_EXEC_START]) {
3226
3227 /* If this is a forked process, then we should
3228 * ignore the return value if this was
3229 * configured for the starter process */
3230
3231 if (s->exec_command[SERVICE_EXEC_START]->flags & EXEC_COMMAND_IGNORE_FAILURE)
3232 f = SERVICE_SUCCESS;
3233 }
3234
3235 /* When this is a successful exit, let's log about the exit code on DEBUG level. If this is a failure
3236 * and the process exited on its own via exit(), then let's make this a NOTICE, under the assumption
3237 * that the service already logged the reason at a higher log level on its own. (Internally,
3238 * unit_log_process_exit() will possibly bump this to WARNING if the service died due to a signal.) */
3239 unit_log_process_exit(
3240 u, f == SERVICE_SUCCESS ? LOG_DEBUG : LOG_NOTICE,
3241 "Main process",
3242 service_exec_command_to_string(SERVICE_EXEC_START),
3243 code, status);
3244
3245 if (s->result == SERVICE_SUCCESS)
3246 s->result = f;
3247
3248 if (s->main_command &&
3249 s->main_command->command_next &&
3250 s->type == SERVICE_ONESHOT &&
3251 f == SERVICE_SUCCESS) {
3252
3253 /* There is another command to *
3254 * execute, so let's do that. */
3255
3256 log_unit_debug(u, "Running next main command for state %s.", service_state_to_string(s->state));
3257 service_run_next_main(s);
3258
3259 } else {
3260
3261 /* The service exited, so the service is officially
3262 * gone. */
3263 s->main_command = NULL;
3264
3265 switch (s->state) {
3266
3267 case SERVICE_START_POST:
3268 case SERVICE_RELOAD:
3269 case SERVICE_STOP:
3270 /* Need to wait until the operation is
3271 * done */
3272 break;
3273
3274 case SERVICE_START:
3275 if (s->type == SERVICE_ONESHOT) {
3276 /* This was our main goal, so let's go on */
3277 if (f == SERVICE_SUCCESS)
3278 service_enter_start_post(s);
3279 else
3280 service_enter_signal(s, SERVICE_STOP_SIGTERM, f);
3281 break;
3282 } else if (s->type == SERVICE_NOTIFY) {
3283 /* Only enter running through a notification, so that the
3284 * SERVICE_START state signifies that no ready notification
3285 * has been received */
3286 if (f != SERVICE_SUCCESS)
3287 service_enter_signal(s, SERVICE_STOP_SIGTERM, f);
3288 else if (!s->remain_after_exit || s->notify_access == NOTIFY_MAIN)
3289 /* The service has never been and will never be active */
3290 service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_FAILURE_PROTOCOL);
3291 break;
3292 }
3293
3294 _fallthrough_;
3295 case SERVICE_RUNNING:
3296 service_enter_running(s, f);
3297 break;
3298
3299 case SERVICE_STOP_WATCHDOG:
3300 case SERVICE_STOP_SIGTERM:
3301 case SERVICE_STOP_SIGKILL:
3302
3303 if (control_pid_good(s) <= 0)
3304 service_enter_stop_post(s, f);
3305
3306 /* If there is still a control process, wait for that first */
3307 break;
3308
3309 case SERVICE_STOP_POST:
3310 case SERVICE_FINAL_SIGTERM:
3311 case SERVICE_FINAL_SIGKILL:
3312
3313 if (control_pid_good(s) <= 0)
3314 service_enter_dead(s, f, true);
3315 break;
3316
3317 default:
3318 assert_not_reached("Uh, main process died at wrong time.");
3319 }
3320 }
3321
3322 } else if (s->control_pid == pid) {
3323 s->control_pid = 0;
3324
3325 if (s->control_command) {
3326 exec_status_exit(&s->control_command->exec_status, &s->exec_context, pid, code, status);
3327
3328 if (s->control_command->flags & EXEC_COMMAND_IGNORE_FAILURE)
3329 f = SERVICE_SUCCESS;
3330 }
3331
3332 unit_log_process_exit(
3333 u, f == SERVICE_SUCCESS ? LOG_DEBUG : LOG_NOTICE,
3334 "Control process",
3335 service_exec_command_to_string(s->control_command_id),
3336 code, status);
3337
3338 if (s->result == SERVICE_SUCCESS)
3339 s->result = f;
3340
3341 if (s->control_command &&
3342 s->control_command->command_next &&
3343 f == SERVICE_SUCCESS) {
3344
3345 /* There is another command to *
3346 * execute, so let's do that. */
3347
3348 log_unit_debug(u, "Running next control command for state %s.", service_state_to_string(s->state));
3349 service_run_next_control(s);
3350
3351 } else {
3352 /* No further commands for this step, so let's
3353 * figure out what to do next */
3354
3355 s->control_command = NULL;
3356 s->control_command_id = _SERVICE_EXEC_COMMAND_INVALID;
3357
3358 log_unit_debug(u, "Got final SIGCHLD for state %s.", service_state_to_string(s->state));
3359
3360 switch (s->state) {
3361
3362 case SERVICE_START_PRE:
3363 if (f == SERVICE_SUCCESS)
3364 service_enter_start(s);
3365 else
3366 service_enter_signal(s, SERVICE_STOP_SIGTERM, f);
3367 break;
3368
3369 case SERVICE_START:
3370 if (s->type != SERVICE_FORKING)
3371 /* Maybe spurious event due to a reload that changed the type? */
3372 break;
3373
3374 if (f != SERVICE_SUCCESS) {
3375 service_enter_signal(s, SERVICE_STOP_SIGTERM, f);
3376 break;
3377 }
3378
3379 if (s->pid_file) {
3380 bool has_start_post;
3381 int r;
3382
3383 /* Let's try to load the pid file here if we can.
3384 * The PID file might actually be created by a START_POST
3385 * script. In that case don't worry if the loading fails. */
3386
3387 has_start_post = s->exec_command[SERVICE_EXEC_START_POST];
3388 r = service_load_pid_file(s, !has_start_post);
3389 if (!has_start_post && r < 0) {
3390 r = service_demand_pid_file(s);
3391 if (r < 0 || cgroup_good(s) == 0)
3392 service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_FAILURE_PROTOCOL);
3393 break;
3394 }
3395 } else
3396 service_search_main_pid(s);
3397
3398 service_enter_start_post(s);
3399 break;
3400
3401 case SERVICE_START_POST:
3402 if (f != SERVICE_SUCCESS) {
3403 service_enter_signal(s, SERVICE_STOP_SIGTERM, f);
3404 break;
3405 }
3406
3407 if (s->pid_file) {
3408 int r;
3409
3410 r = service_load_pid_file(s, true);
3411 if (r < 0) {
3412 r = service_demand_pid_file(s);
3413 if (r < 0 || cgroup_good(s) == 0)
3414 service_enter_stop(s, SERVICE_FAILURE_PROTOCOL);
3415 break;
3416 }
3417 } else
3418 service_search_main_pid(s);
3419
3420 service_enter_running(s, SERVICE_SUCCESS);
3421 break;
3422
3423 case SERVICE_RELOAD:
3424 if (f == SERVICE_SUCCESS)
3425 if (service_load_pid_file(s, true) < 0)
3426 service_search_main_pid(s);
3427
3428 s->reload_result = f;
3429 service_enter_running(s, SERVICE_SUCCESS);
3430 break;
3431
3432 case SERVICE_STOP:
3433 service_enter_signal(s, SERVICE_STOP_SIGTERM, f);
3434 break;
3435
3436 case SERVICE_STOP_WATCHDOG:
3437 case SERVICE_STOP_SIGTERM:
3438 case SERVICE_STOP_SIGKILL:
3439 if (main_pid_good(s) <= 0)
3440 service_enter_stop_post(s, f);
3441
3442 /* If there is still a service
3443 * process around, wait until
3444 * that one quit, too */
3445 break;
3446
3447 case SERVICE_STOP_POST:
3448 case SERVICE_FINAL_SIGTERM:
3449 case SERVICE_FINAL_SIGKILL:
3450 if (main_pid_good(s) <= 0)
3451 service_enter_dead(s, f, true);
3452 break;
3453
3454 default:
3455 assert_not_reached("Uh, control process died at wrong time.");
3456 }
3457 }
3458 } else /* Neither control nor main PID? If so, don't notify about anything */
3459 notify_dbus = false;
3460
3461 /* Notify clients about changed exit status */
3462 if (notify_dbus)
3463 unit_add_to_dbus_queue(u);
3464
3465 /* If we get a SIGCHLD event for one of the processes we were interested in, then we look for others to watch,
3466 * under the assumption that we'll sooner or later get a SIGCHLD for them, as the original process we watched
3467 * was probably the parent of them, and they are hence now our children. */
3468 (void) unit_enqueue_rewatch_pids(u);
3469 }
3470
3471 static int service_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) {
3472 Service *s = SERVICE(userdata);
3473
3474 assert(s);
3475 assert(source == s->timer_event_source);
3476
3477 switch (s->state) {
3478
3479 case SERVICE_START_PRE:
3480 case SERVICE_START:
3481 log_unit_warning(UNIT(s), "%s operation timed out. Terminating.", s->state == SERVICE_START ? "Start" : "Start-pre");
3482 service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_FAILURE_TIMEOUT);
3483 break;
3484
3485 case SERVICE_START_POST:
3486 log_unit_warning(UNIT(s), "Start-post operation timed out. Stopping.");
3487 service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_FAILURE_TIMEOUT);
3488 break;
3489
3490 case SERVICE_RUNNING:
3491 log_unit_warning(UNIT(s), "Service reached runtime time limit. Stopping.");
3492 service_enter_stop(s, SERVICE_FAILURE_TIMEOUT);
3493 break;
3494
3495 case SERVICE_RELOAD:
3496 log_unit_warning(UNIT(s), "Reload operation timed out. Killing reload process.");
3497 service_kill_control_process(s);
3498 s->reload_result = SERVICE_FAILURE_TIMEOUT;
3499 service_enter_running(s, SERVICE_SUCCESS);
3500 break;
3501
3502 case SERVICE_STOP:
3503 log_unit_warning(UNIT(s), "Stopping timed out. Terminating.");
3504 service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_FAILURE_TIMEOUT);
3505 break;
3506
3507 case SERVICE_STOP_WATCHDOG:
3508 log_unit_warning(UNIT(s), "State 'stop-watchdog' timed out. Terminating.");
3509 service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_FAILURE_TIMEOUT);
3510 break;
3511
3512 case SERVICE_STOP_SIGTERM:
3513 if (s->kill_context.send_sigkill) {
3514 log_unit_warning(UNIT(s), "State 'stop-sigterm' timed out. Killing.");
3515 service_enter_signal(s, SERVICE_STOP_SIGKILL, SERVICE_FAILURE_TIMEOUT);
3516 } else {
3517 log_unit_warning(UNIT(s), "State 'stop-sigterm' timed out. Skipping SIGKILL.");
3518 service_enter_stop_post(s, SERVICE_FAILURE_TIMEOUT);
3519 }
3520
3521 break;
3522
3523 case SERVICE_STOP_SIGKILL:
3524 /* Uh, we sent a SIGKILL and it is still not gone?
3525 * Must be something we cannot kill, so let's just be
3526 * weirded out and continue */
3527
3528 log_unit_warning(UNIT(s), "Processes still around after SIGKILL. Ignoring.");
3529 service_enter_stop_post(s, SERVICE_FAILURE_TIMEOUT);
3530 break;
3531
3532 case SERVICE_STOP_POST:
3533 log_unit_warning(UNIT(s), "State 'stop-post' timed out. Terminating.");
3534 service_enter_signal(s, SERVICE_FINAL_SIGTERM, SERVICE_FAILURE_TIMEOUT);
3535 break;
3536
3537 case SERVICE_FINAL_SIGTERM:
3538 if (s->kill_context.send_sigkill) {
3539 log_unit_warning(UNIT(s), "State 'stop-final-sigterm' timed out. Killing.");
3540 service_enter_signal(s, SERVICE_FINAL_SIGKILL, SERVICE_FAILURE_TIMEOUT);
3541 } else {
3542 log_unit_warning(UNIT(s), "State 'stop-final-sigterm' timed out. Skipping SIGKILL. Entering failed mode.");
3543 service_enter_dead(s, SERVICE_FAILURE_TIMEOUT, false);
3544 }
3545
3546 break;
3547
3548 case SERVICE_FINAL_SIGKILL:
3549 log_unit_warning(UNIT(s), "Processes still around after final SIGKILL. Entering failed mode.");
3550 service_enter_dead(s, SERVICE_FAILURE_TIMEOUT, true);
3551 break;
3552
3553 case SERVICE_AUTO_RESTART:
3554 if (s->restart_usec > 0) {
3555 char buf_restart[FORMAT_TIMESPAN_MAX];
3556 log_unit_info(UNIT(s),
3557 "Service RestartSec=%s expired, scheduling restart.",
3558 format_timespan(buf_restart, sizeof buf_restart, s->restart_usec, USEC_PER_SEC));
3559 } else
3560 log_unit_info(UNIT(s),
3561 "Service has no hold-off time (RestartSec=0), scheduling restart.");
3562
3563 service_enter_restart(s);
3564 break;
3565
3566 default:
3567 assert_not_reached("Timeout at wrong time.");
3568 }
3569
3570 return 0;
3571 }
3572
3573 static int service_dispatch_watchdog(sd_event_source *source, usec_t usec, void *userdata) {
3574 Service *s = SERVICE(userdata);
3575 char t[FORMAT_TIMESPAN_MAX];
3576 usec_t watchdog_usec;
3577
3578 assert(s);
3579 assert(source == s->watchdog_event_source);
3580
3581 watchdog_usec = service_get_watchdog_usec(s);
3582
3583 if (UNIT(s)->manager->service_watchdogs) {
3584 log_unit_error(UNIT(s), "Watchdog timeout (limit %s)!",
3585 format_timespan(t, sizeof(t), watchdog_usec, 1));
3586
3587 service_enter_signal(s, SERVICE_STOP_WATCHDOG, SERVICE_FAILURE_WATCHDOG);
3588 } else
3589 log_unit_warning(UNIT(s), "Watchdog disabled! Ignoring watchdog timeout (limit %s)!",
3590 format_timespan(t, sizeof(t), watchdog_usec, 1));
3591
3592 return 0;
3593 }
3594
3595 static bool service_notify_message_authorized(Service *s, pid_t pid, char **tags, FDSet *fds) {
3596 assert(s);
3597
3598 if (s->notify_access == NOTIFY_NONE) {
3599 log_unit_warning(UNIT(s), "Got notification message from PID "PID_FMT", but reception is disabled.", pid);
3600 return false;
3601 }
3602
3603 if (s->notify_access == NOTIFY_MAIN && pid != s->main_pid) {
3604 if (s->main_pid != 0)
3605 log_unit_warning(UNIT(s), "Got notification message from PID "PID_FMT", but reception only permitted for main PID "PID_FMT, pid, s->main_pid);
3606 else
3607 log_unit_warning(UNIT(s), "Got notification message from PID "PID_FMT", but reception only permitted for main PID which is currently not known", pid);
3608
3609 return false;
3610 }
3611
3612 if (s->notify_access == NOTIFY_EXEC && pid != s->main_pid && pid != s->control_pid) {
3613 if (s->main_pid != 0 && s->control_pid != 0)
3614 log_unit_warning(UNIT(s), "Got notification message from PID "PID_FMT", but reception only permitted for main PID "PID_FMT" and control PID "PID_FMT,
3615 pid, s->main_pid, s->control_pid);
3616 else if (s->main_pid != 0)
3617 log_unit_warning(UNIT(s), "Got notification message from PID "PID_FMT", but reception only permitted for main PID "PID_FMT, pid, s->main_pid);
3618 else if (s->control_pid != 0)
3619 log_unit_warning(UNIT(s), "Got notification message from PID "PID_FMT", but reception only permitted for control PID "PID_FMT, pid, s->control_pid);
3620 else
3621 log_unit_warning(UNIT(s), "Got notification message from PID "PID_FMT", but reception only permitted for main PID and control PID which are currently not known", pid);
3622
3623 return false;
3624 }
3625
3626 return true;
3627 }
3628
3629 static void service_notify_message(
3630 Unit *u,
3631 const struct ucred *ucred,
3632 char **tags,
3633 FDSet *fds) {
3634
3635 Service *s = SERVICE(u);
3636 bool notify_dbus = false;
3637 const char *e;
3638 char **i;
3639 int r;
3640
3641 assert(u);
3642 assert(ucred);
3643
3644 if (!service_notify_message_authorized(SERVICE(u), ucred->pid, tags, fds))
3645 return;
3646
3647 if (DEBUG_LOGGING) {
3648 _cleanup_free_ char *cc = NULL;
3649
3650 cc = strv_join(tags, ", ");
3651 log_unit_debug(u, "Got notification message from PID "PID_FMT" (%s)", ucred->pid, isempty(cc) ? "n/a" : cc);
3652 }
3653
3654 /* Interpret MAINPID= */
3655 e = strv_find_startswith(tags, "MAINPID=");
3656 if (e && IN_SET(s->state, SERVICE_START, SERVICE_START_POST, SERVICE_RUNNING, SERVICE_RELOAD)) {
3657 pid_t new_main_pid;
3658
3659 if (parse_pid(e, &new_main_pid) < 0)
3660 log_unit_warning(u, "Failed to parse MAINPID= field in notification message, ignoring: %s", e);
3661 else if (!s->main_pid_known || new_main_pid != s->main_pid) {
3662
3663 r = service_is_suitable_main_pid(s, new_main_pid, LOG_WARNING);
3664 if (r == 0) {
3665 /* The new main PID is a bit suspicous, which is OK if the sender is privileged. */
3666
3667 if (ucred->uid == 0) {
3668 log_unit_debug(u, "New main PID "PID_FMT" does not belong to service, but we'll accept it as the request to change it came from a privileged process.", new_main_pid);
3669 r = 1;
3670 } else
3671 log_unit_debug(u, "New main PID "PID_FMT" does not belong to service, refusing.", new_main_pid);
3672 }
3673 if (r > 0) {
3674 service_set_main_pid(s, new_main_pid);
3675
3676 r = unit_watch_pid(UNIT(s), new_main_pid);
3677 if (r < 0)
3678 log_unit_warning_errno(UNIT(s), r, "Failed to watch new main PID "PID_FMT" for service: %m", new_main_pid);
3679
3680 notify_dbus = true;
3681 }
3682 }
3683 }
3684
3685 /* Interpret READY=/STOPPING=/RELOADING=. Last one wins. */
3686 STRV_FOREACH_BACKWARDS(i, tags) {
3687
3688 if (streq(*i, "READY=1")) {
3689 s->notify_state = NOTIFY_READY;
3690
3691 /* Type=notify services inform us about completed
3692 * initialization with READY=1 */
3693 if (s->type == SERVICE_NOTIFY && s->state == SERVICE_START)
3694 service_enter_start_post(s);
3695
3696 /* Sending READY=1 while we are reloading informs us
3697 * that the reloading is complete */
3698 if (s->state == SERVICE_RELOAD && s->control_pid == 0)
3699 service_enter_running(s, SERVICE_SUCCESS);
3700
3701 notify_dbus = true;
3702 break;
3703
3704 } else if (streq(*i, "RELOADING=1")) {
3705 s->notify_state = NOTIFY_RELOADING;
3706
3707 if (s->state == SERVICE_RUNNING)
3708 service_enter_reload_by_notify(s);
3709
3710 notify_dbus = true;
3711 break;
3712
3713 } else if (streq(*i, "STOPPING=1")) {
3714 s->notify_state = NOTIFY_STOPPING;
3715
3716 if (s->state == SERVICE_RUNNING)
3717 service_enter_stop_by_notify(s);
3718
3719 notify_dbus = true;
3720 break;
3721 }
3722 }
3723
3724 /* Interpret STATUS= */
3725 e = strv_find_startswith(tags, "STATUS=");
3726 if (e) {
3727 _cleanup_free_ char *t = NULL;
3728
3729 if (!isempty(e)) {
3730 /* Note that this size limit check is mostly paranoia: since the datagram size we are willing
3731 * to process is already limited to NOTIFY_BUFFER_MAX, this limit here should never be hit. */
3732 if (strlen(e) > STATUS_TEXT_MAX)
3733 log_unit_warning(u, "Status message overly long (%zu > %u), ignoring.", strlen(e), STATUS_TEXT_MAX);
3734 else if (!utf8_is_valid(e))
3735 log_unit_warning(u, "Status message in notification message is not UTF-8 clean, ignoring.");
3736 else {
3737 t = strdup(e);
3738 if (!t)
3739 log_oom();
3740 }
3741 }
3742
3743 if (!streq_ptr(s->status_text, t)) {
3744 free_and_replace(s->status_text, t);
3745 notify_dbus = true;
3746 }
3747 }
3748
3749 /* Interpret ERRNO= */
3750 e = strv_find_startswith(tags, "ERRNO=");
3751 if (e) {
3752 int status_errno;
3753
3754 status_errno = parse_errno(e);
3755 if (status_errno < 0)
3756 log_unit_warning_errno(u, status_errno,
3757 "Failed to parse ERRNO= field value '%s' in notification message: %m", e);
3758 else if (s->status_errno != status_errno) {
3759 s->status_errno = status_errno;
3760 notify_dbus = true;
3761 }
3762 }
3763
3764 /* Interpret EXTEND_TIMEOUT= */
3765 e = strv_find_startswith(tags, "EXTEND_TIMEOUT_USEC=");
3766 if (e) {
3767 usec_t extend_timeout_usec;
3768 if (safe_atou64(e, &extend_timeout_usec) < 0)
3769 log_unit_warning(u, "Failed to parse EXTEND_TIMEOUT_USEC=%s", e);
3770 else
3771 service_extend_timeout(s, extend_timeout_usec);
3772 }
3773
3774 /* Interpret WATCHDOG= */
3775 if (strv_find(tags, "WATCHDOG=1"))
3776 service_reset_watchdog(s);
3777
3778 e = strv_find_startswith(tags, "WATCHDOG_USEC=");
3779 if (e) {
3780 usec_t watchdog_override_usec;
3781 if (safe_atou64(e, &watchdog_override_usec) < 0)
3782 log_unit_warning(u, "Failed to parse WATCHDOG_USEC=%s", e);
3783 else
3784 service_override_watchdog_timeout(s, watchdog_override_usec);
3785 }
3786
3787 /* Process FD store messages. Either FDSTOREREMOVE=1 for removal, or FDSTORE=1 for addition. In both cases,
3788 * process FDNAME= for picking the file descriptor name to use. Note that FDNAME= is required when removing
3789 * fds, but optional when pushing in new fds, for compatibility reasons. */
3790 if (strv_find(tags, "FDSTOREREMOVE=1")) {
3791 const char *name;
3792
3793 name = strv_find_startswith(tags, "FDNAME=");
3794 if (!name || !fdname_is_valid(name))
3795 log_unit_warning(u, "FDSTOREREMOVE=1 requested, but no valid file descriptor name passed, ignoring.");
3796 else
3797 service_remove_fd_store(s, name);
3798
3799 } else if (strv_find(tags, "FDSTORE=1")) {
3800 const char *name;
3801
3802 name = strv_find_startswith(tags, "FDNAME=");
3803 if (name && !fdname_is_valid(name)) {
3804 log_unit_warning(u, "Passed FDNAME= name is invalid, ignoring.");
3805 name = NULL;
3806 }
3807
3808 (void) service_add_fd_store_set(s, fds, name);
3809 }
3810
3811 /* Notify clients about changed status or main pid */
3812 if (notify_dbus)
3813 unit_add_to_dbus_queue(u);
3814 }
3815
3816 static int service_get_timeout(Unit *u, usec_t *timeout) {
3817 Service *s = SERVICE(u);
3818 uint64_t t;
3819 int r;
3820
3821 if (!s->timer_event_source)
3822 return 0;
3823
3824 r = sd_event_source_get_time(s->timer_event_source, &t);
3825 if (r < 0)
3826 return r;
3827 if (t == USEC_INFINITY)
3828 return 0;
3829
3830 *timeout = t;
3831 return 1;
3832 }
3833
3834 static void service_bus_name_owner_change(
3835 Unit *u,
3836 const char *name,
3837 const char *old_owner,
3838 const char *new_owner) {
3839
3840 Service *s = SERVICE(u);
3841 int r;
3842
3843 assert(s);
3844 assert(name);
3845
3846 assert(streq(s->bus_name, name));
3847 assert(old_owner || new_owner);
3848
3849 if (old_owner && new_owner)
3850 log_unit_debug(u, "D-Bus name %s changed owner from %s to %s", name, old_owner, new_owner);
3851 else if (old_owner)
3852 log_unit_debug(u, "D-Bus name %s no longer registered by %s", name, old_owner);
3853 else
3854 log_unit_debug(u, "D-Bus name %s now registered by %s", name, new_owner);
3855
3856 s->bus_name_good = !!new_owner;
3857
3858 /* Track the current owner, so we can reconstruct changes after a daemon reload */
3859 r = free_and_strdup(&s->bus_name_owner, new_owner);
3860 if (r < 0) {
3861 log_unit_error_errno(u, r, "Unable to set new bus name owner %s: %m", new_owner);
3862 return;
3863 }
3864
3865 if (s->type == SERVICE_DBUS) {
3866
3867 /* service_enter_running() will figure out what to
3868 * do */
3869 if (s->state == SERVICE_RUNNING)
3870 service_enter_running(s, SERVICE_SUCCESS);
3871 else if (s->state == SERVICE_START && new_owner)
3872 service_enter_start_post(s);
3873
3874 } else if (new_owner &&
3875 s->main_pid <= 0 &&
3876 IN_SET(s->state,
3877 SERVICE_START,
3878 SERVICE_START_POST,
3879 SERVICE_RUNNING,
3880 SERVICE_RELOAD)) {
3881
3882 _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
3883 pid_t pid;
3884
3885 /* Try to acquire PID from bus service */
3886
3887 r = sd_bus_get_name_creds(u->manager->api_bus, name, SD_BUS_CREDS_PID, &creds);
3888 if (r >= 0)
3889 r = sd_bus_creds_get_pid(creds, &pid);
3890 if (r >= 0) {
3891 log_unit_debug(u, "D-Bus name %s is now owned by process " PID_FMT, name, pid);
3892
3893 service_set_main_pid(s, pid);
3894 unit_watch_pid(UNIT(s), pid);
3895 }
3896 }
3897 }
3898
3899 int service_set_socket_fd(Service *s, int fd, Socket *sock, bool selinux_context_net) {
3900 _cleanup_free_ char *peer = NULL;
3901 int r;
3902
3903 assert(s);
3904 assert(fd >= 0);
3905
3906 /* This is called by the socket code when instantiating a new service for a stream socket and the socket needs
3907 * to be configured. We take ownership of the passed fd on success. */
3908
3909 if (UNIT(s)->load_state != UNIT_LOADED)
3910 return -EINVAL;
3911
3912 if (s->socket_fd >= 0)
3913 return -EBUSY;
3914
3915 if (s->state != SERVICE_DEAD)
3916 return -EAGAIN;
3917
3918 if (getpeername_pretty(fd, true, &peer) >= 0) {
3919
3920 if (UNIT(s)->description) {
3921 _cleanup_free_ char *a;
3922
3923 a = strjoin(UNIT(s)->description, " (", peer, ")");
3924 if (!a)
3925 return -ENOMEM;
3926
3927 r = unit_set_description(UNIT(s), a);
3928 } else
3929 r = unit_set_description(UNIT(s), peer);
3930
3931 if (r < 0)
3932 return r;
3933 }
3934
3935 r = unit_add_two_dependencies(UNIT(sock), UNIT_BEFORE, UNIT_TRIGGERS, UNIT(s), false, UNIT_DEPENDENCY_IMPLICIT);
3936 if (r < 0)
3937 return r;
3938
3939 s->socket_fd = fd;
3940 s->socket_fd_selinux_context_net = selinux_context_net;
3941
3942 unit_ref_set(&s->accept_socket, UNIT(s), UNIT(sock));
3943 return 0;
3944 }
3945
3946 static void service_reset_failed(Unit *u) {
3947 Service *s = SERVICE(u);
3948
3949 assert(s);
3950
3951 if (s->state == SERVICE_FAILED)
3952 service_set_state(s, SERVICE_DEAD);
3953
3954 s->result = SERVICE_SUCCESS;
3955 s->reload_result = SERVICE_SUCCESS;
3956 s->n_restarts = 0;
3957 s->flush_n_restarts = false;
3958 }
3959
3960 static int service_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) {
3961 Service *s = SERVICE(u);
3962
3963 assert(s);
3964
3965 return unit_kill_common(u, who, signo, s->main_pid, s->control_pid, error);
3966 }
3967
3968 static int service_main_pid(Unit *u) {
3969 Service *s = SERVICE(u);
3970
3971 assert(s);
3972
3973 return s->main_pid;
3974 }
3975
3976 static int service_control_pid(Unit *u) {
3977 Service *s = SERVICE(u);
3978
3979 assert(s);
3980
3981 return s->control_pid;
3982 }
3983
3984 static bool service_needs_console(Unit *u) {
3985 Service *s = SERVICE(u);
3986
3987 assert(s);
3988
3989 /* We provide our own implementation of this here, instead of relying of the generic implementation
3990 * unit_needs_console() provides, since we want to return false if we are in SERVICE_EXITED state. */
3991
3992 if (!exec_context_may_touch_console(&s->exec_context))
3993 return false;
3994
3995 return IN_SET(s->state,
3996 SERVICE_START_PRE,
3997 SERVICE_START,
3998 SERVICE_START_POST,
3999 SERVICE_RUNNING,
4000 SERVICE_RELOAD,
4001 SERVICE_STOP,
4002 SERVICE_STOP_WATCHDOG,
4003 SERVICE_STOP_SIGTERM,
4004 SERVICE_STOP_SIGKILL,
4005 SERVICE_STOP_POST,
4006 SERVICE_FINAL_SIGTERM,
4007 SERVICE_FINAL_SIGKILL);
4008 }
4009
4010 static int service_exit_status(Unit *u) {
4011 Service *s = SERVICE(u);
4012
4013 assert(u);
4014
4015 if (s->main_exec_status.pid <= 0 ||
4016 !dual_timestamp_is_set(&s->main_exec_status.exit_timestamp))
4017 return -ENODATA;
4018
4019 if (s->main_exec_status.code != CLD_EXITED)
4020 return -EBADE;
4021
4022 return s->main_exec_status.status;
4023 }
4024
4025 static const char* const service_restart_table[_SERVICE_RESTART_MAX] = {
4026 [SERVICE_RESTART_NO] = "no",
4027 [SERVICE_RESTART_ON_SUCCESS] = "on-success",
4028 [SERVICE_RESTART_ON_FAILURE] = "on-failure",
4029 [SERVICE_RESTART_ON_ABNORMAL] = "on-abnormal",
4030 [SERVICE_RESTART_ON_WATCHDOG] = "on-watchdog",
4031 [SERVICE_RESTART_ON_ABORT] = "on-abort",
4032 [SERVICE_RESTART_ALWAYS] = "always",
4033 };
4034
4035 DEFINE_STRING_TABLE_LOOKUP(service_restart, ServiceRestart);
4036
4037 static const char* const service_type_table[_SERVICE_TYPE_MAX] = {
4038 [SERVICE_SIMPLE] = "simple",
4039 [SERVICE_FORKING] = "forking",
4040 [SERVICE_ONESHOT] = "oneshot",
4041 [SERVICE_DBUS] = "dbus",
4042 [SERVICE_NOTIFY] = "notify",
4043 [SERVICE_IDLE] = "idle",
4044 [SERVICE_EXEC] = "exec",
4045 };
4046
4047 DEFINE_STRING_TABLE_LOOKUP(service_type, ServiceType);
4048
4049 static const char* const service_exec_command_table[_SERVICE_EXEC_COMMAND_MAX] = {
4050 [SERVICE_EXEC_START_PRE] = "ExecStartPre",
4051 [SERVICE_EXEC_START] = "ExecStart",
4052 [SERVICE_EXEC_START_POST] = "ExecStartPost",
4053 [SERVICE_EXEC_RELOAD] = "ExecReload",
4054 [SERVICE_EXEC_STOP] = "ExecStop",
4055 [SERVICE_EXEC_STOP_POST] = "ExecStopPost",
4056 };
4057
4058 DEFINE_STRING_TABLE_LOOKUP(service_exec_command, ServiceExecCommand);
4059
4060 static const char* const notify_state_table[_NOTIFY_STATE_MAX] = {
4061 [NOTIFY_UNKNOWN] = "unknown",
4062 [NOTIFY_READY] = "ready",
4063 [NOTIFY_RELOADING] = "reloading",
4064 [NOTIFY_STOPPING] = "stopping",
4065 };
4066
4067 DEFINE_STRING_TABLE_LOOKUP(notify_state, NotifyState);
4068
4069 static const char* const service_result_table[_SERVICE_RESULT_MAX] = {
4070 [SERVICE_SUCCESS] = "success",
4071 [SERVICE_FAILURE_RESOURCES] = "resources",
4072 [SERVICE_FAILURE_PROTOCOL] = "protocol",
4073 [SERVICE_FAILURE_TIMEOUT] = "timeout",
4074 [SERVICE_FAILURE_EXIT_CODE] = "exit-code",
4075 [SERVICE_FAILURE_SIGNAL] = "signal",
4076 [SERVICE_FAILURE_CORE_DUMP] = "core-dump",
4077 [SERVICE_FAILURE_WATCHDOG] = "watchdog",
4078 [SERVICE_FAILURE_START_LIMIT_HIT] = "start-limit-hit",
4079 };
4080
4081 DEFINE_STRING_TABLE_LOOKUP(service_result, ServiceResult);
4082
4083 const UnitVTable service_vtable = {
4084 .object_size = sizeof(Service),
4085 .exec_context_offset = offsetof(Service, exec_context),
4086 .cgroup_context_offset = offsetof(Service, cgroup_context),
4087 .kill_context_offset = offsetof(Service, kill_context),
4088 .exec_runtime_offset = offsetof(Service, exec_runtime),
4089 .dynamic_creds_offset = offsetof(Service, dynamic_creds),
4090
4091 .sections =
4092 "Unit\0"
4093 "Service\0"
4094 "Install\0",
4095 .private_section = "Service",
4096
4097 .can_transient = true,
4098 .can_delegate = true,
4099
4100 .init = service_init,
4101 .done = service_done,
4102 .load = service_load,
4103 .release_resources = service_release_resources,
4104
4105 .coldplug = service_coldplug,
4106
4107 .dump = service_dump,
4108
4109 .start = service_start,
4110 .stop = service_stop,
4111 .reload = service_reload,
4112
4113 .can_reload = service_can_reload,
4114
4115 .kill = service_kill,
4116
4117 .serialize = service_serialize,
4118 .deserialize_item = service_deserialize_item,
4119
4120 .active_state = service_active_state,
4121 .sub_state_to_string = service_sub_state_to_string,
4122
4123 .will_restart = service_will_restart,
4124
4125 .may_gc = service_may_gc,
4126
4127 .sigchld_event = service_sigchld_event,
4128
4129 .reset_failed = service_reset_failed,
4130
4131 .notify_cgroup_empty = service_notify_cgroup_empty_event,
4132 .notify_message = service_notify_message,
4133
4134 .main_pid = service_main_pid,
4135 .control_pid = service_control_pid,
4136
4137 .bus_name_owner_change = service_bus_name_owner_change,
4138
4139 .bus_vtable = bus_service_vtable,
4140 .bus_set_property = bus_service_set_property,
4141 .bus_commit_properties = bus_service_commit_properties,
4142
4143 .get_timeout = service_get_timeout,
4144 .needs_console = service_needs_console,
4145 .exit_status = service_exit_status,
4146
4147 .status_message_formats = {
4148 .starting_stopping = {
4149 [0] = "Starting %s...",
4150 [1] = "Stopping %s...",
4151 },
4152 .finished_start_job = {
4153 [JOB_DONE] = "Started %s.",
4154 [JOB_FAILED] = "Failed to start %s.",
4155 },
4156 .finished_stop_job = {
4157 [JOB_DONE] = "Stopped %s.",
4158 [JOB_FAILED] = "Stopped (with error) %s.",
4159 },
4160 },
4161 };
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