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