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Merge pull request #11099 from abogdanenko/udev-test-fix-missing-dir
[thirdparty/systemd.git] / src / core / service.c
1 /* SPDX-License-Identifier: LGPL-2.1+ */
2
3 #include <errno.h>
4 #include <signal.h>
5 #include <unistd.h>
6
7 #include "sd-messages.h"
8
9 #include "alloc-util.h"
10 #include "async.h"
11 #include "bus-error.h"
12 #include "bus-kernel.h"
13 #include "bus-util.h"
14 #include "dbus-service.h"
15 #include "dbus-unit.h"
16 #include "def.h"
17 #include "env-util.h"
18 #include "escape.h"
19 #include "exit-status.h"
20 #include "fd-util.h"
21 #include "fileio.h"
22 #include "format-util.h"
23 #include "fs-util.h"
24 #include "load-dropin.h"
25 #include "load-fragment.h"
26 #include "log.h"
27 #include "manager.h"
28 #include "parse-util.h"
29 #include "path-util.h"
30 #include "process-util.h"
31 #include "serialize.h"
32 #include "service.h"
33 #include "signal-util.h"
34 #include "special.h"
35 #include "stdio-util.h"
36 #include "string-table.h"
37 #include "string-util.h"
38 #include "strv.h"
39 #include "unit-name.h"
40 #include "unit.h"
41 #include "utf8.h"
42 #include "util.h"
43
44 static const UnitActiveState state_translation_table[_SERVICE_STATE_MAX] = {
45 [SERVICE_DEAD] = UNIT_INACTIVE,
46 [SERVICE_START_PRE] = UNIT_ACTIVATING,
47 [SERVICE_START] = UNIT_ACTIVATING,
48 [SERVICE_START_POST] = UNIT_ACTIVATING,
49 [SERVICE_RUNNING] = UNIT_ACTIVE,
50 [SERVICE_EXITED] = UNIT_ACTIVE,
51 [SERVICE_RELOAD] = UNIT_RELOADING,
52 [SERVICE_STOP] = UNIT_DEACTIVATING,
53 [SERVICE_STOP_WATCHDOG] = UNIT_DEACTIVATING,
54 [SERVICE_STOP_SIGTERM] = UNIT_DEACTIVATING,
55 [SERVICE_STOP_SIGKILL] = UNIT_DEACTIVATING,
56 [SERVICE_STOP_POST] = UNIT_DEACTIVATING,
57 [SERVICE_FINAL_SIGTERM] = UNIT_DEACTIVATING,
58 [SERVICE_FINAL_SIGKILL] = UNIT_DEACTIVATING,
59 [SERVICE_FAILED] = UNIT_FAILED,
60 [SERVICE_AUTO_RESTART] = UNIT_ACTIVATING
61 };
62
63 /* For Type=idle we never want to delay any other jobs, hence we
64 * consider idle jobs active as soon as we start working on them */
65 static const UnitActiveState state_translation_table_idle[_SERVICE_STATE_MAX] = {
66 [SERVICE_DEAD] = UNIT_INACTIVE,
67 [SERVICE_START_PRE] = UNIT_ACTIVE,
68 [SERVICE_START] = UNIT_ACTIVE,
69 [SERVICE_START_POST] = UNIT_ACTIVE,
70 [SERVICE_RUNNING] = UNIT_ACTIVE,
71 [SERVICE_EXITED] = UNIT_ACTIVE,
72 [SERVICE_RELOAD] = UNIT_RELOADING,
73 [SERVICE_STOP] = UNIT_DEACTIVATING,
74 [SERVICE_STOP_WATCHDOG] = UNIT_DEACTIVATING,
75 [SERVICE_STOP_SIGTERM] = UNIT_DEACTIVATING,
76 [SERVICE_STOP_SIGKILL] = UNIT_DEACTIVATING,
77 [SERVICE_STOP_POST] = UNIT_DEACTIVATING,
78 [SERVICE_FINAL_SIGTERM] = UNIT_DEACTIVATING,
79 [SERVICE_FINAL_SIGKILL] = UNIT_DEACTIVATING,
80 [SERVICE_FAILED] = UNIT_FAILED,
81 [SERVICE_AUTO_RESTART] = UNIT_ACTIVATING
82 };
83
84 static int service_dispatch_inotify_io(sd_event_source *source, int fd, uint32_t events, void *userdata);
85 static int service_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata);
86 static int service_dispatch_watchdog(sd_event_source *source, usec_t usec, void *userdata);
87 static int service_dispatch_exec_io(sd_event_source *source, int fd, uint32_t events, void *userdata);
88
89 static void service_enter_signal(Service *s, ServiceState state, ServiceResult f);
90 static void service_enter_reload_by_notify(Service *s);
91
92 static void service_init(Unit *u) {
93 Service *s = SERVICE(u);
94
95 assert(u);
96 assert(u->load_state == UNIT_STUB);
97
98 s->timeout_start_usec = u->manager->default_timeout_start_usec;
99 s->timeout_stop_usec = u->manager->default_timeout_stop_usec;
100 s->restart_usec = u->manager->default_restart_usec;
101 s->runtime_max_usec = USEC_INFINITY;
102 s->type = _SERVICE_TYPE_INVALID;
103 s->socket_fd = -1;
104 s->stdin_fd = s->stdout_fd = s->stderr_fd = -1;
105 s->guess_main_pid = true;
106
107 s->control_command_id = _SERVICE_EXEC_COMMAND_INVALID;
108
109 s->exec_context.keyring_mode = MANAGER_IS_SYSTEM(u->manager) ?
110 EXEC_KEYRING_PRIVATE : EXEC_KEYRING_INHERIT;
111
112 s->watchdog_original_usec = USEC_INFINITY;
113 }
114
115 static void service_unwatch_control_pid(Service *s) {
116 assert(s);
117
118 if (s->control_pid <= 0)
119 return;
120
121 unit_unwatch_pid(UNIT(s), s->control_pid);
122 s->control_pid = 0;
123 }
124
125 static void service_unwatch_main_pid(Service *s) {
126 assert(s);
127
128 if (s->main_pid <= 0)
129 return;
130
131 unit_unwatch_pid(UNIT(s), s->main_pid);
132 s->main_pid = 0;
133 }
134
135 static void service_unwatch_pid_file(Service *s) {
136 if (!s->pid_file_pathspec)
137 return;
138
139 log_unit_debug(UNIT(s), "Stopping watch for PID file %s", s->pid_file_pathspec->path);
140 path_spec_unwatch(s->pid_file_pathspec);
141 path_spec_done(s->pid_file_pathspec);
142 s->pid_file_pathspec = mfree(s->pid_file_pathspec);
143 }
144
145 static int service_set_main_pid(Service *s, pid_t pid) {
146 pid_t ppid;
147
148 assert(s);
149
150 if (pid <= 1)
151 return -EINVAL;
152
153 if (pid == getpid_cached())
154 return -EINVAL;
155
156 if (s->main_pid == pid && s->main_pid_known)
157 return 0;
158
159 if (s->main_pid != pid) {
160 service_unwatch_main_pid(s);
161 exec_status_start(&s->main_exec_status, pid);
162 }
163
164 s->main_pid = pid;
165 s->main_pid_known = true;
166
167 if (get_process_ppid(pid, &ppid) >= 0 && ppid != getpid_cached()) {
168 log_unit_warning(UNIT(s), "Supervising process "PID_FMT" which is not our child. We'll most likely not notice when it exits.", pid);
169 s->main_pid_alien = true;
170 } else
171 s->main_pid_alien = false;
172
173 return 0;
174 }
175
176 void service_close_socket_fd(Service *s) {
177 assert(s);
178
179 /* Undo the effect of service_set_socket_fd(). */
180
181 s->socket_fd = asynchronous_close(s->socket_fd);
182
183 if (UNIT_ISSET(s->accept_socket)) {
184 socket_connection_unref(SOCKET(UNIT_DEREF(s->accept_socket)));
185 unit_ref_unset(&s->accept_socket);
186 }
187 }
188
189 static void service_stop_watchdog(Service *s) {
190 assert(s);
191
192 s->watchdog_event_source = sd_event_source_unref(s->watchdog_event_source);
193 s->watchdog_timestamp = DUAL_TIMESTAMP_NULL;
194 }
195
196 static usec_t service_get_watchdog_usec(Service *s) {
197 assert(s);
198
199 if (s->watchdog_override_enable)
200 return s->watchdog_override_usec;
201
202 return s->watchdog_original_usec;
203 }
204
205 static void service_start_watchdog(Service *s) {
206 usec_t watchdog_usec;
207 int r;
208
209 assert(s);
210
211 watchdog_usec = service_get_watchdog_usec(s);
212 if (IN_SET(watchdog_usec, 0, USEC_INFINITY)) {
213 service_stop_watchdog(s);
214 return;
215 }
216
217 if (s->watchdog_event_source) {
218 r = sd_event_source_set_time(s->watchdog_event_source, usec_add(s->watchdog_timestamp.monotonic, watchdog_usec));
219 if (r < 0) {
220 log_unit_warning_errno(UNIT(s), r, "Failed to reset watchdog timer: %m");
221 return;
222 }
223
224 r = sd_event_source_set_enabled(s->watchdog_event_source, SD_EVENT_ONESHOT);
225 } else {
226 r = sd_event_add_time(
227 UNIT(s)->manager->event,
228 &s->watchdog_event_source,
229 CLOCK_MONOTONIC,
230 usec_add(s->watchdog_timestamp.monotonic, watchdog_usec), 0,
231 service_dispatch_watchdog, s);
232 if (r < 0) {
233 log_unit_warning_errno(UNIT(s), r, "Failed to add watchdog timer: %m");
234 return;
235 }
236
237 (void) sd_event_source_set_description(s->watchdog_event_source, "service-watchdog");
238
239 /* Let's process everything else which might be a sign
240 * of living before we consider a service died. */
241 r = sd_event_source_set_priority(s->watchdog_event_source, SD_EVENT_PRIORITY_IDLE);
242 }
243 if (r < 0)
244 log_unit_warning_errno(UNIT(s), r, "Failed to install watchdog timer: %m");
245 }
246
247 static void service_extend_event_source_timeout(Service *s, sd_event_source *source, usec_t extended) {
248 usec_t current;
249 int r;
250
251 assert(s);
252
253 /* Extends the specified event source timer to at least the specified time, unless it is already later
254 * anyway. */
255
256 if (!source)
257 return;
258
259 r = sd_event_source_get_time(source, &current);
260 if (r < 0) {
261 const char *desc;
262 (void) sd_event_source_get_description(s->timer_event_source, &desc);
263 log_unit_warning_errno(UNIT(s), r, "Failed to retrieve timeout time for event source '%s', ignoring: %m", strna(desc));
264 return;
265 }
266
267 if (current >= extended) /* Current timeout is already longer, ignore this. */
268 return;
269
270 r = sd_event_source_set_time(source, extended);
271 if (r < 0) {
272 const char *desc;
273 (void) sd_event_source_get_description(s->timer_event_source, &desc);
274 log_unit_warning_errno(UNIT(s), r, "Failed to set timeout time for even source '%s', ignoring %m", strna(desc));
275 }
276 }
277
278 static void service_extend_timeout(Service *s, usec_t extend_timeout_usec) {
279 usec_t extended;
280
281 assert(s);
282
283 if (IN_SET(extend_timeout_usec, 0, USEC_INFINITY))
284 return;
285
286 extended = usec_add(now(CLOCK_MONOTONIC), extend_timeout_usec);
287
288 service_extend_event_source_timeout(s, s->timer_event_source, extended);
289 service_extend_event_source_timeout(s, s->watchdog_event_source, extended);
290 }
291
292 static void service_reset_watchdog(Service *s) {
293 assert(s);
294
295 dual_timestamp_get(&s->watchdog_timestamp);
296 service_start_watchdog(s);
297 }
298
299 static void service_override_watchdog_timeout(Service *s, usec_t watchdog_override_usec) {
300 assert(s);
301
302 s->watchdog_override_enable = true;
303 s->watchdog_override_usec = watchdog_override_usec;
304 service_reset_watchdog(s);
305
306 log_unit_debug(UNIT(s), "watchdog_usec="USEC_FMT, s->watchdog_usec);
307 log_unit_debug(UNIT(s), "watchdog_override_usec="USEC_FMT, s->watchdog_override_usec);
308 }
309
310 static void service_fd_store_unlink(ServiceFDStore *fs) {
311
312 if (!fs)
313 return;
314
315 if (fs->service) {
316 assert(fs->service->n_fd_store > 0);
317 LIST_REMOVE(fd_store, fs->service->fd_store, fs);
318 fs->service->n_fd_store--;
319 }
320
321 if (fs->event_source) {
322 sd_event_source_set_enabled(fs->event_source, SD_EVENT_OFF);
323 sd_event_source_unref(fs->event_source);
324 }
325
326 free(fs->fdname);
327 safe_close(fs->fd);
328 free(fs);
329 }
330
331 static void service_release_fd_store(Service *s) {
332 assert(s);
333
334 if (s->n_keep_fd_store > 0)
335 return;
336
337 log_unit_debug(UNIT(s), "Releasing all stored fds");
338 while (s->fd_store)
339 service_fd_store_unlink(s->fd_store);
340
341 assert(s->n_fd_store == 0);
342 }
343
344 static void service_release_resources(Unit *u) {
345 Service *s = SERVICE(u);
346
347 assert(s);
348
349 if (!s->fd_store && s->stdin_fd < 0 && s->stdout_fd < 0 && s->stderr_fd < 0)
350 return;
351
352 log_unit_debug(u, "Releasing resources.");
353
354 s->stdin_fd = safe_close(s->stdin_fd);
355 s->stdout_fd = safe_close(s->stdout_fd);
356 s->stderr_fd = safe_close(s->stderr_fd);
357
358 service_release_fd_store(s);
359 }
360
361 static void service_done(Unit *u) {
362 Service *s = SERVICE(u);
363
364 assert(s);
365
366 s->pid_file = mfree(s->pid_file);
367 s->status_text = mfree(s->status_text);
368
369 s->exec_runtime = exec_runtime_unref(s->exec_runtime, false);
370 exec_command_free_array(s->exec_command, _SERVICE_EXEC_COMMAND_MAX);
371 s->control_command = NULL;
372 s->main_command = NULL;
373
374 dynamic_creds_unref(&s->dynamic_creds);
375
376 exit_status_set_free(&s->restart_prevent_status);
377 exit_status_set_free(&s->restart_force_status);
378 exit_status_set_free(&s->success_status);
379
380 /* This will leak a process, but at least no memory or any of
381 * our resources */
382 service_unwatch_main_pid(s);
383 service_unwatch_control_pid(s);
384 service_unwatch_pid_file(s);
385
386 if (s->bus_name) {
387 unit_unwatch_bus_name(u, s->bus_name);
388 s->bus_name = mfree(s->bus_name);
389 }
390
391 s->bus_name_owner = mfree(s->bus_name_owner);
392
393 s->usb_function_descriptors = mfree(s->usb_function_descriptors);
394 s->usb_function_strings = mfree(s->usb_function_strings);
395
396 service_close_socket_fd(s);
397 s->peer = socket_peer_unref(s->peer);
398
399 unit_ref_unset(&s->accept_socket);
400
401 service_stop_watchdog(s);
402
403 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
404 s->exec_fd_event_source = sd_event_source_unref(s->exec_fd_event_source);
405
406 service_release_resources(u);
407 }
408
409 static int on_fd_store_io(sd_event_source *e, int fd, uint32_t revents, void *userdata) {
410 ServiceFDStore *fs = userdata;
411
412 assert(e);
413 assert(fs);
414
415 /* If we get either EPOLLHUP or EPOLLERR, it's time to remove this entry from the fd store */
416 log_unit_debug(UNIT(fs->service),
417 "Received %s on stored fd %d (%s), closing.",
418 revents & EPOLLERR ? "EPOLLERR" : "EPOLLHUP",
419 fs->fd, strna(fs->fdname));
420 service_fd_store_unlink(fs);
421 return 0;
422 }
423
424 static int service_add_fd_store(Service *s, int fd, const char *name) {
425 ServiceFDStore *fs;
426 int r;
427
428 /* fd is always consumed if we return >= 0 */
429
430 assert(s);
431 assert(fd >= 0);
432
433 if (s->n_fd_store >= s->n_fd_store_max)
434 return -EXFULL; /* Our store is full.
435 * Use this errno rather than E[NM]FILE to distinguish from
436 * the case where systemd itself hits the file limit. */
437
438 LIST_FOREACH(fd_store, fs, s->fd_store) {
439 r = same_fd(fs->fd, fd);
440 if (r < 0)
441 return r;
442 if (r > 0) {
443 safe_close(fd);
444 return 0; /* fd already included */
445 }
446 }
447
448 fs = new0(ServiceFDStore, 1);
449 if (!fs)
450 return -ENOMEM;
451
452 fs->fd = fd;
453 fs->service = s;
454 fs->fdname = strdup(name ?: "stored");
455 if (!fs->fdname) {
456 free(fs);
457 return -ENOMEM;
458 }
459
460 r = sd_event_add_io(UNIT(s)->manager->event, &fs->event_source, fd, 0, on_fd_store_io, fs);
461 if (r < 0 && r != -EPERM) { /* EPERM indicates fds that aren't pollable, which is OK */
462 free(fs->fdname);
463 free(fs);
464 return r;
465 } else if (r >= 0)
466 (void) sd_event_source_set_description(fs->event_source, "service-fd-store");
467
468 LIST_PREPEND(fd_store, s->fd_store, fs);
469 s->n_fd_store++;
470
471 return 1; /* fd newly stored */
472 }
473
474 static int service_add_fd_store_set(Service *s, FDSet *fds, const char *name) {
475 int r;
476
477 assert(s);
478
479 while (fdset_size(fds) > 0) {
480 _cleanup_close_ int fd = -1;
481
482 fd = fdset_steal_first(fds);
483 if (fd < 0)
484 break;
485
486 r = service_add_fd_store(s, fd, name);
487 if (r == -EXFULL)
488 return log_unit_warning_errno(UNIT(s), r,
489 "Cannot store more fds than FileDescriptorStoreMax=%u, closing remaining.",
490 s->n_fd_store_max);
491 if (r < 0)
492 return log_unit_error_errno(UNIT(s), r, "Failed to add fd to store: %m");
493 if (r > 0)
494 log_unit_debug(UNIT(s), "Added fd %u (%s) to fd store.", fd, strna(name));
495 fd = -1;
496 }
497
498 return 0;
499 }
500
501 static void service_remove_fd_store(Service *s, const char *name) {
502 ServiceFDStore *fs, *n;
503
504 assert(s);
505 assert(name);
506
507 LIST_FOREACH_SAFE(fd_store, fs, n, s->fd_store) {
508 if (!streq(fs->fdname, name))
509 continue;
510
511 log_unit_debug(UNIT(s), "Got explicit request to remove fd %i (%s), closing.", fs->fd, name);
512 service_fd_store_unlink(fs);
513 }
514 }
515
516 static int service_arm_timer(Service *s, usec_t usec) {
517 int r;
518
519 assert(s);
520
521 if (s->timer_event_source) {
522 r = sd_event_source_set_time(s->timer_event_source, usec);
523 if (r < 0)
524 return r;
525
526 return sd_event_source_set_enabled(s->timer_event_source, SD_EVENT_ONESHOT);
527 }
528
529 if (usec == USEC_INFINITY)
530 return 0;
531
532 r = sd_event_add_time(
533 UNIT(s)->manager->event,
534 &s->timer_event_source,
535 CLOCK_MONOTONIC,
536 usec, 0,
537 service_dispatch_timer, s);
538 if (r < 0)
539 return r;
540
541 (void) sd_event_source_set_description(s->timer_event_source, "service-timer");
542
543 return 0;
544 }
545
546 static int service_verify(Service *s) {
547 assert(s);
548
549 if (UNIT(s)->load_state != UNIT_LOADED)
550 return 0;
551
552 if (!s->exec_command[SERVICE_EXEC_START] && !s->exec_command[SERVICE_EXEC_STOP]
553 && UNIT(s)->success_action == EMERGENCY_ACTION_NONE) {
554 /* FailureAction= only makes sense if one of the start or stop commands is specified.
555 * SuccessAction= will be executed unconditionally if no commands are specified. Hence,
556 * either a command or SuccessAction= are required. */
557
558 log_unit_error(UNIT(s), "Service has no ExecStart=, ExecStop=, or SuccessAction=. Refusing.");
559 return -ENOEXEC;
560 }
561
562 if (s->type != SERVICE_ONESHOT && !s->exec_command[SERVICE_EXEC_START]) {
563 log_unit_error(UNIT(s), "Service has no ExecStart= setting, which is only allowed for Type=oneshot services. Refusing.");
564 return -ENOEXEC;
565 }
566
567 if (!s->remain_after_exit && !s->exec_command[SERVICE_EXEC_START] && UNIT(s)->success_action == EMERGENCY_ACTION_NONE) {
568 log_unit_error(UNIT(s), "Service has no ExecStart= and no SuccessAction= settings and does not have RemainAfterExit=yes set. Refusing.");
569 return -ENOEXEC;
570 }
571
572 if (s->type != SERVICE_ONESHOT && s->exec_command[SERVICE_EXEC_START]->command_next) {
573 log_unit_error(UNIT(s), "Service has more than one ExecStart= setting, which is only allowed for Type=oneshot services. Refusing.");
574 return -ENOEXEC;
575 }
576
577 if (s->type == SERVICE_ONESHOT && s->restart != SERVICE_RESTART_NO) {
578 log_unit_error(UNIT(s), "Service has Restart= setting other than no, which isn't allowed for Type=oneshot services. Refusing.");
579 return -ENOEXEC;
580 }
581
582 if (s->type == SERVICE_ONESHOT && !exit_status_set_is_empty(&s->restart_force_status)) {
583 log_unit_error(UNIT(s), "Service has RestartForceStatus= set, which isn't allowed for Type=oneshot services. Refusing.");
584 return -ENOEXEC;
585 }
586
587 if (s->type == SERVICE_DBUS && !s->bus_name) {
588 log_unit_error(UNIT(s), "Service is of type D-Bus but no D-Bus service name has been specified. Refusing.");
589 return -ENOEXEC;
590 }
591
592 if (s->bus_name && s->type != SERVICE_DBUS)
593 log_unit_warning(UNIT(s), "Service has a D-Bus service name specified, but is not of type dbus. Ignoring.");
594
595 if (s->exec_context.pam_name && !IN_SET(s->kill_context.kill_mode, KILL_CONTROL_GROUP, KILL_MIXED)) {
596 log_unit_error(UNIT(s), "Service has PAM enabled. Kill mode must be set to 'control-group' or 'mixed'. Refusing.");
597 return -ENOEXEC;
598 }
599
600 if (s->usb_function_descriptors && !s->usb_function_strings)
601 log_unit_warning(UNIT(s), "Service has USBFunctionDescriptors= setting, but no USBFunctionStrings=. Ignoring.");
602
603 if (!s->usb_function_descriptors && s->usb_function_strings)
604 log_unit_warning(UNIT(s), "Service has USBFunctionStrings= setting, but no USBFunctionDescriptors=. Ignoring.");
605
606 if (s->runtime_max_usec != USEC_INFINITY && s->type == SERVICE_ONESHOT)
607 log_unit_warning(UNIT(s), "MaxRuntimeSec= has no effect in combination with Type=oneshot. Ignoring.");
608
609 return 0;
610 }
611
612 static int service_add_default_dependencies(Service *s) {
613 int r;
614
615 assert(s);
616
617 if (!UNIT(s)->default_dependencies)
618 return 0;
619
620 /* Add a number of automatic dependencies useful for the
621 * majority of services. */
622
623 if (MANAGER_IS_SYSTEM(UNIT(s)->manager)) {
624 /* First, pull in the really early boot stuff, and
625 * require it, so that we fail if we can't acquire
626 * it. */
627
628 r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SYSINIT_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
629 if (r < 0)
630 return r;
631 } else {
632
633 /* In the --user instance there's no sysinit.target,
634 * in that case require basic.target instead. */
635
636 r = unit_add_dependency_by_name(UNIT(s), UNIT_REQUIRES, SPECIAL_BASIC_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
637 if (r < 0)
638 return r;
639 }
640
641 /* Second, if the rest of the base system is in the same
642 * transaction, order us after it, but do not pull it in or
643 * even require it. */
644 r = unit_add_dependency_by_name(UNIT(s), UNIT_AFTER, SPECIAL_BASIC_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
645 if (r < 0)
646 return r;
647
648 /* Third, add us in for normal shutdown. */
649 return unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
650 }
651
652 static void service_fix_output(Service *s) {
653 assert(s);
654
655 /* If nothing has been explicitly configured, patch default output in. If input is socket/tty we avoid this
656 * however, since in that case we want output to default to the same place as we read input from. */
657
658 if (s->exec_context.std_error == EXEC_OUTPUT_INHERIT &&
659 s->exec_context.std_output == EXEC_OUTPUT_INHERIT &&
660 s->exec_context.std_input == EXEC_INPUT_NULL)
661 s->exec_context.std_error = UNIT(s)->manager->default_std_error;
662
663 if (s->exec_context.std_output == EXEC_OUTPUT_INHERIT &&
664 s->exec_context.std_input == EXEC_INPUT_NULL)
665 s->exec_context.std_output = UNIT(s)->manager->default_std_output;
666
667 if (s->exec_context.std_input == EXEC_INPUT_NULL &&
668 s->exec_context.stdin_data_size > 0)
669 s->exec_context.std_input = EXEC_INPUT_DATA;
670 }
671
672 static int service_setup_bus_name(Service *s) {
673 int r;
674
675 assert(s);
676
677 if (!s->bus_name)
678 return 0;
679
680 r = unit_add_dependency_by_name(UNIT(s), UNIT_REQUIRES, SPECIAL_DBUS_SOCKET, true, UNIT_DEPENDENCY_FILE);
681 if (r < 0)
682 return log_unit_error_errno(UNIT(s), r, "Failed to add dependency on " SPECIAL_DBUS_SOCKET ": %m");
683
684 /* We always want to be ordered against dbus.socket if both are in the transaction. */
685 r = unit_add_dependency_by_name(UNIT(s), UNIT_AFTER, SPECIAL_DBUS_SOCKET, true, UNIT_DEPENDENCY_FILE);
686 if (r < 0)
687 return log_unit_error_errno(UNIT(s), r, "Failed to add dependency on " SPECIAL_DBUS_SOCKET ": %m");
688
689 r = unit_watch_bus_name(UNIT(s), s->bus_name);
690 if (r == -EEXIST)
691 return log_unit_error_errno(UNIT(s), r, "Two services allocated for the same bus name %s, refusing operation.", s->bus_name);
692 if (r < 0)
693 return log_unit_error_errno(UNIT(s), r, "Cannot watch bus name %s: %m", s->bus_name);
694
695 return 0;
696 }
697
698 static int service_add_extras(Service *s) {
699 int r;
700
701 assert(s);
702
703 if (s->type == _SERVICE_TYPE_INVALID) {
704 /* Figure out a type automatically */
705 if (s->bus_name)
706 s->type = SERVICE_DBUS;
707 else if (s->exec_command[SERVICE_EXEC_START])
708 s->type = SERVICE_SIMPLE;
709 else
710 s->type = SERVICE_ONESHOT;
711 }
712
713 /* Oneshot services have disabled start timeout by default */
714 if (s->type == SERVICE_ONESHOT && !s->start_timeout_defined)
715 s->timeout_start_usec = USEC_INFINITY;
716
717 service_fix_output(s);
718
719 r = unit_patch_contexts(UNIT(s));
720 if (r < 0)
721 return r;
722
723 r = unit_add_exec_dependencies(UNIT(s), &s->exec_context);
724 if (r < 0)
725 return r;
726
727 r = unit_set_default_slice(UNIT(s));
728 if (r < 0)
729 return r;
730
731 /* If the service needs the notify socket, let's enable it automatically. */
732 if (s->notify_access == NOTIFY_NONE &&
733 (s->type == SERVICE_NOTIFY || s->watchdog_usec > 0 || s->n_fd_store_max > 0))
734 s->notify_access = NOTIFY_MAIN;
735
736 r = service_add_default_dependencies(s);
737 if (r < 0)
738 return r;
739
740 r = service_setup_bus_name(s);
741 if (r < 0)
742 return r;
743
744 return 0;
745 }
746
747 static int service_load(Unit *u) {
748 Service *s = SERVICE(u);
749 int r;
750
751 assert(s);
752
753 /* Load a .service file */
754 r = unit_load_fragment(u);
755 if (r < 0)
756 return r;
757
758 /* Still nothing found? Then let's give up */
759 if (u->load_state == UNIT_STUB)
760 return -ENOENT;
761
762 /* This is a new unit? Then let's add in some extras */
763 if (u->load_state == UNIT_LOADED) {
764
765 /* We were able to load something, then let's add in
766 * the dropin directories. */
767 r = unit_load_dropin(u);
768 if (r < 0)
769 return r;
770
771 /* This is a new unit? Then let's add in some
772 * extras */
773 r = service_add_extras(s);
774 if (r < 0)
775 return r;
776 }
777
778 return service_verify(s);
779 }
780
781 static void service_dump(Unit *u, FILE *f, const char *prefix) {
782 char buf_restart[FORMAT_TIMESPAN_MAX], buf_start[FORMAT_TIMESPAN_MAX], buf_stop[FORMAT_TIMESPAN_MAX];
783 char buf_runtime[FORMAT_TIMESPAN_MAX], buf_watchdog[FORMAT_TIMESPAN_MAX];
784 ServiceExecCommand c;
785 Service *s = SERVICE(u);
786 const char *prefix2;
787
788 assert(s);
789
790 prefix = strempty(prefix);
791 prefix2 = strjoina(prefix, "\t");
792
793 fprintf(f,
794 "%sService State: %s\n"
795 "%sResult: %s\n"
796 "%sReload Result: %s\n"
797 "%sPermissionsStartOnly: %s\n"
798 "%sRootDirectoryStartOnly: %s\n"
799 "%sRemainAfterExit: %s\n"
800 "%sGuessMainPID: %s\n"
801 "%sType: %s\n"
802 "%sRestart: %s\n"
803 "%sNotifyAccess: %s\n"
804 "%sNotifyState: %s\n",
805 prefix, service_state_to_string(s->state),
806 prefix, service_result_to_string(s->result),
807 prefix, service_result_to_string(s->reload_result),
808 prefix, yes_no(s->permissions_start_only),
809 prefix, yes_no(s->root_directory_start_only),
810 prefix, yes_no(s->remain_after_exit),
811 prefix, yes_no(s->guess_main_pid),
812 prefix, service_type_to_string(s->type),
813 prefix, service_restart_to_string(s->restart),
814 prefix, notify_access_to_string(s->notify_access),
815 prefix, notify_state_to_string(s->notify_state));
816
817 if (s->control_pid > 0)
818 fprintf(f,
819 "%sControl PID: "PID_FMT"\n",
820 prefix, s->control_pid);
821
822 if (s->main_pid > 0)
823 fprintf(f,
824 "%sMain PID: "PID_FMT"\n"
825 "%sMain PID Known: %s\n"
826 "%sMain PID Alien: %s\n",
827 prefix, s->main_pid,
828 prefix, yes_no(s->main_pid_known),
829 prefix, yes_no(s->main_pid_alien));
830
831 if (s->pid_file)
832 fprintf(f,
833 "%sPIDFile: %s\n",
834 prefix, s->pid_file);
835
836 if (s->bus_name)
837 fprintf(f,
838 "%sBusName: %s\n"
839 "%sBus Name Good: %s\n",
840 prefix, s->bus_name,
841 prefix, yes_no(s->bus_name_good));
842
843 if (UNIT_ISSET(s->accept_socket))
844 fprintf(f,
845 "%sAccept Socket: %s\n",
846 prefix, UNIT_DEREF(s->accept_socket)->id);
847
848 fprintf(f,
849 "%sRestartSec: %s\n"
850 "%sTimeoutStartSec: %s\n"
851 "%sTimeoutStopSec: %s\n"
852 "%sRuntimeMaxSec: %s\n"
853 "%sWatchdogSec: %s\n",
854 prefix, format_timespan(buf_restart, sizeof(buf_restart), s->restart_usec, USEC_PER_SEC),
855 prefix, format_timespan(buf_start, sizeof(buf_start), s->timeout_start_usec, USEC_PER_SEC),
856 prefix, format_timespan(buf_stop, sizeof(buf_stop), s->timeout_stop_usec, USEC_PER_SEC),
857 prefix, format_timespan(buf_runtime, sizeof(buf_runtime), s->runtime_max_usec, USEC_PER_SEC),
858 prefix, format_timespan(buf_watchdog, sizeof(buf_watchdog), s->watchdog_usec, USEC_PER_SEC));
859
860 kill_context_dump(&s->kill_context, f, prefix);
861 exec_context_dump(&s->exec_context, f, prefix);
862
863 for (c = 0; c < _SERVICE_EXEC_COMMAND_MAX; c++) {
864
865 if (!s->exec_command[c])
866 continue;
867
868 fprintf(f, "%s-> %s:\n",
869 prefix, service_exec_command_to_string(c));
870
871 exec_command_dump_list(s->exec_command[c], f, prefix2);
872 }
873
874 if (s->status_text)
875 fprintf(f, "%sStatus Text: %s\n",
876 prefix, s->status_text);
877
878 if (s->n_fd_store_max > 0)
879 fprintf(f,
880 "%sFile Descriptor Store Max: %u\n"
881 "%sFile Descriptor Store Current: %zu\n",
882 prefix, s->n_fd_store_max,
883 prefix, s->n_fd_store);
884
885 cgroup_context_dump(&s->cgroup_context, f, prefix);
886 }
887
888 static int service_is_suitable_main_pid(Service *s, pid_t pid, int prio) {
889 Unit *owner;
890
891 assert(s);
892 assert(pid_is_valid(pid));
893
894 /* Checks whether the specified PID is suitable as main PID for this service. returns negative if not, 0 if the
895 * PID is questionnable but should be accepted if the source of configuration is trusted. > 0 if the PID is
896 * good */
897
898 if (pid == getpid_cached() || pid == 1) {
899 log_unit_full(UNIT(s), prio, 0, "New main PID "PID_FMT" is the manager, refusing.", pid);
900 return -EPERM;
901 }
902
903 if (pid == s->control_pid) {
904 log_unit_full(UNIT(s), prio, 0, "New main PID "PID_FMT" is the control process, refusing.", pid);
905 return -EPERM;
906 }
907
908 if (!pid_is_alive(pid)) {
909 log_unit_full(UNIT(s), prio, 0, "New main PID "PID_FMT" does not exist or is a zombie.", pid);
910 return -ESRCH;
911 }
912
913 owner = manager_get_unit_by_pid(UNIT(s)->manager, pid);
914 if (owner == UNIT(s)) {
915 log_unit_debug(UNIT(s), "New main PID "PID_FMT" belongs to service, we are happy.", pid);
916 return 1; /* Yay, it's definitely a good PID */
917 }
918
919 return 0; /* Hmm it's a suspicious PID, let's accept it if configuration source is trusted */
920 }
921
922 static int service_load_pid_file(Service *s, bool may_warn) {
923 char procfs[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
924 bool questionable_pid_file = false;
925 _cleanup_free_ char *k = NULL;
926 _cleanup_close_ int fd = -1;
927 int r, prio;
928 pid_t pid;
929
930 assert(s);
931
932 if (!s->pid_file)
933 return -ENOENT;
934
935 prio = may_warn ? LOG_INFO : LOG_DEBUG;
936
937 fd = chase_symlinks(s->pid_file, NULL, CHASE_OPEN|CHASE_SAFE, NULL);
938 if (fd == -ENOLINK) {
939 log_unit_full(UNIT(s), LOG_DEBUG, fd, "Potentially unsafe symlink chain, will now retry with relaxed checks: %s", s->pid_file);
940
941 questionable_pid_file = true;
942
943 fd = chase_symlinks(s->pid_file, NULL, CHASE_OPEN, NULL);
944 }
945 if (fd < 0)
946 return log_unit_full(UNIT(s), prio, fd, "Can't open PID file %s (yet?) after %s: %m", s->pid_file, service_state_to_string(s->state));
947
948 /* Let's read the PID file now that we chased it down. But we need to convert the O_PATH fd chase_symlinks() returned us into a proper fd first. */
949 xsprintf(procfs, "/proc/self/fd/%i", fd);
950 r = read_one_line_file(procfs, &k);
951 if (r < 0)
952 return log_unit_error_errno(UNIT(s), r, "Can't convert PID files %s O_PATH file descriptor to proper file descriptor: %m", s->pid_file);
953
954 r = parse_pid(k, &pid);
955 if (r < 0)
956 return log_unit_full(UNIT(s), prio, r, "Failed to parse PID from file %s: %m", s->pid_file);
957
958 if (s->main_pid_known && pid == s->main_pid)
959 return 0;
960
961 r = service_is_suitable_main_pid(s, pid, prio);
962 if (r < 0)
963 return r;
964 if (r == 0) {
965 struct stat st;
966
967 if (questionable_pid_file) {
968 log_unit_error(UNIT(s), "Refusing to accept PID outside of service control group, acquired through unsafe symlink chain: %s", s->pid_file);
969 return -EPERM;
970 }
971
972 /* Hmm, it's not clear if the new main PID is safe. Let's allow this if the PID file is owned by root */
973
974 if (fstat(fd, &st) < 0)
975 return log_unit_error_errno(UNIT(s), errno, "Failed to fstat() PID file O_PATH fd: %m");
976
977 if (st.st_uid != 0) {
978 log_unit_error(UNIT(s), "New main PID "PID_FMT" does not belong to service, and PID file is not owned by root. Refusing.", pid);
979 return -EPERM;
980 }
981
982 log_unit_debug(UNIT(s), "New main PID "PID_FMT" does not belong to service, but we'll accept it since PID file is owned by root.", pid);
983 }
984
985 if (s->main_pid_known) {
986 log_unit_debug(UNIT(s), "Main PID changing: "PID_FMT" -> "PID_FMT, s->main_pid, pid);
987
988 service_unwatch_main_pid(s);
989 s->main_pid_known = false;
990 } else
991 log_unit_debug(UNIT(s), "Main PID loaded: "PID_FMT, pid);
992
993 r = service_set_main_pid(s, pid);
994 if (r < 0)
995 return r;
996
997 r = unit_watch_pid(UNIT(s), pid);
998 if (r < 0) /* FIXME: we need to do something here */
999 return log_unit_warning_errno(UNIT(s), r, "Failed to watch PID "PID_FMT" for service: %m", pid);
1000
1001 return 1;
1002 }
1003
1004 static void service_search_main_pid(Service *s) {
1005 pid_t pid = 0;
1006 int r;
1007
1008 assert(s);
1009
1010 /* If we know it anyway, don't ever fallback to unreliable
1011 * heuristics */
1012 if (s->main_pid_known)
1013 return;
1014
1015 if (!s->guess_main_pid)
1016 return;
1017
1018 assert(s->main_pid <= 0);
1019
1020 if (unit_search_main_pid(UNIT(s), &pid) < 0)
1021 return;
1022
1023 log_unit_debug(UNIT(s), "Main PID guessed: "PID_FMT, pid);
1024 if (service_set_main_pid(s, pid) < 0)
1025 return;
1026
1027 r = unit_watch_pid(UNIT(s), pid);
1028 if (r < 0)
1029 /* FIXME: we need to do something here */
1030 log_unit_warning_errno(UNIT(s), r, "Failed to watch PID "PID_FMT" from: %m", pid);
1031 }
1032
1033 static void service_set_state(Service *s, ServiceState state) {
1034 ServiceState old_state;
1035 const UnitActiveState *table;
1036
1037 assert(s);
1038
1039 if (s->state != state)
1040 bus_unit_send_pending_change_signal(UNIT(s), false);
1041
1042 table = s->type == SERVICE_IDLE ? state_translation_table_idle : state_translation_table;
1043
1044 old_state = s->state;
1045 s->state = state;
1046
1047 service_unwatch_pid_file(s);
1048
1049 if (!IN_SET(state,
1050 SERVICE_START_PRE, SERVICE_START, SERVICE_START_POST,
1051 SERVICE_RUNNING,
1052 SERVICE_RELOAD,
1053 SERVICE_STOP, SERVICE_STOP_WATCHDOG, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL, SERVICE_STOP_POST,
1054 SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL,
1055 SERVICE_AUTO_RESTART))
1056 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
1057
1058 if (!IN_SET(state,
1059 SERVICE_START, SERVICE_START_POST,
1060 SERVICE_RUNNING, SERVICE_RELOAD,
1061 SERVICE_STOP, SERVICE_STOP_WATCHDOG, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL, SERVICE_STOP_POST,
1062 SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL)) {
1063 service_unwatch_main_pid(s);
1064 s->main_command = NULL;
1065 }
1066
1067 if (!IN_SET(state,
1068 SERVICE_START_PRE, SERVICE_START, SERVICE_START_POST,
1069 SERVICE_RELOAD,
1070 SERVICE_STOP, SERVICE_STOP_WATCHDOG, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL, SERVICE_STOP_POST,
1071 SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL)) {
1072 service_unwatch_control_pid(s);
1073 s->control_command = NULL;
1074 s->control_command_id = _SERVICE_EXEC_COMMAND_INVALID;
1075 }
1076
1077 if (IN_SET(state, SERVICE_DEAD, SERVICE_FAILED, SERVICE_AUTO_RESTART)) {
1078 unit_unwatch_all_pids(UNIT(s));
1079 unit_dequeue_rewatch_pids(UNIT(s));
1080 }
1081
1082 if (!IN_SET(state,
1083 SERVICE_START_PRE, SERVICE_START, SERVICE_START_POST,
1084 SERVICE_RUNNING, SERVICE_RELOAD,
1085 SERVICE_STOP, SERVICE_STOP_WATCHDOG, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL, SERVICE_STOP_POST,
1086 SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL) &&
1087 !(state == SERVICE_DEAD && UNIT(s)->job))
1088 service_close_socket_fd(s);
1089
1090 if (state != SERVICE_START)
1091 s->exec_fd_event_source = sd_event_source_unref(s->exec_fd_event_source);
1092
1093 if (!IN_SET(state, SERVICE_START_POST, SERVICE_RUNNING, SERVICE_RELOAD))
1094 service_stop_watchdog(s);
1095
1096 /* For the inactive states unit_notify() will trim the cgroup,
1097 * but for exit we have to do that ourselves... */
1098 if (state == SERVICE_EXITED && !MANAGER_IS_RELOADING(UNIT(s)->manager))
1099 unit_prune_cgroup(UNIT(s));
1100
1101 if (old_state != state)
1102 log_unit_debug(UNIT(s), "Changed %s -> %s", service_state_to_string(old_state), service_state_to_string(state));
1103
1104 unit_notify(UNIT(s), table[old_state], table[state],
1105 (s->reload_result == SERVICE_SUCCESS ? 0 : UNIT_NOTIFY_RELOAD_FAILURE) |
1106 (s->will_auto_restart ? UNIT_NOTIFY_WILL_AUTO_RESTART : 0));
1107 }
1108
1109 static usec_t service_coldplug_timeout(Service *s) {
1110 assert(s);
1111
1112 switch (s->deserialized_state) {
1113
1114 case SERVICE_START_PRE:
1115 case SERVICE_START:
1116 case SERVICE_START_POST:
1117 case SERVICE_RELOAD:
1118 return usec_add(UNIT(s)->state_change_timestamp.monotonic, s->timeout_start_usec);
1119
1120 case SERVICE_RUNNING:
1121 return usec_add(UNIT(s)->active_enter_timestamp.monotonic, s->runtime_max_usec);
1122
1123 case SERVICE_STOP:
1124 case SERVICE_STOP_WATCHDOG:
1125 case SERVICE_STOP_SIGTERM:
1126 case SERVICE_STOP_SIGKILL:
1127 case SERVICE_STOP_POST:
1128 case SERVICE_FINAL_SIGTERM:
1129 case SERVICE_FINAL_SIGKILL:
1130 return usec_add(UNIT(s)->state_change_timestamp.monotonic, s->timeout_stop_usec);
1131
1132 case SERVICE_AUTO_RESTART:
1133 return usec_add(UNIT(s)->inactive_enter_timestamp.monotonic, s->restart_usec);
1134
1135 default:
1136 return USEC_INFINITY;
1137 }
1138 }
1139
1140 static int service_coldplug(Unit *u) {
1141 Service *s = SERVICE(u);
1142 int r;
1143
1144 assert(s);
1145 assert(s->state == SERVICE_DEAD);
1146
1147 if (s->deserialized_state == s->state)
1148 return 0;
1149
1150 r = service_arm_timer(s, service_coldplug_timeout(s));
1151 if (r < 0)
1152 return r;
1153
1154 if (s->main_pid > 0 &&
1155 pid_is_unwaited(s->main_pid) &&
1156 (IN_SET(s->deserialized_state,
1157 SERVICE_START, SERVICE_START_POST,
1158 SERVICE_RUNNING, SERVICE_RELOAD,
1159 SERVICE_STOP, SERVICE_STOP_WATCHDOG, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL, SERVICE_STOP_POST,
1160 SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL))) {
1161 r = unit_watch_pid(UNIT(s), s->main_pid);
1162 if (r < 0)
1163 return r;
1164 }
1165
1166 if (s->control_pid > 0 &&
1167 pid_is_unwaited(s->control_pid) &&
1168 IN_SET(s->deserialized_state,
1169 SERVICE_START_PRE, SERVICE_START, SERVICE_START_POST,
1170 SERVICE_RELOAD,
1171 SERVICE_STOP, SERVICE_STOP_WATCHDOG, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL, SERVICE_STOP_POST,
1172 SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL)) {
1173 r = unit_watch_pid(UNIT(s), s->control_pid);
1174 if (r < 0)
1175 return r;
1176 }
1177
1178 if (!IN_SET(s->deserialized_state, SERVICE_DEAD, SERVICE_FAILED, SERVICE_AUTO_RESTART)) {
1179 (void) unit_enqueue_rewatch_pids(u);
1180 (void) unit_setup_dynamic_creds(u);
1181 (void) unit_setup_exec_runtime(u);
1182 }
1183
1184 if (IN_SET(s->deserialized_state, SERVICE_START_POST, SERVICE_RUNNING, SERVICE_RELOAD))
1185 service_start_watchdog(s);
1186
1187 if (UNIT_ISSET(s->accept_socket)) {
1188 Socket* socket = SOCKET(UNIT_DEREF(s->accept_socket));
1189
1190 if (socket->max_connections_per_source > 0) {
1191 SocketPeer *peer;
1192
1193 /* Make a best-effort attempt at bumping the connection count */
1194 if (socket_acquire_peer(socket, s->socket_fd, &peer) > 0) {
1195 socket_peer_unref(s->peer);
1196 s->peer = peer;
1197 }
1198 }
1199 }
1200
1201 service_set_state(s, s->deserialized_state);
1202 return 0;
1203 }
1204
1205 static int service_collect_fds(
1206 Service *s,
1207 int **fds,
1208 char ***fd_names,
1209 size_t *n_socket_fds,
1210 size_t *n_storage_fds) {
1211
1212 _cleanup_strv_free_ char **rfd_names = NULL;
1213 _cleanup_free_ int *rfds = NULL;
1214 size_t rn_socket_fds = 0, rn_storage_fds = 0;
1215 int r;
1216
1217 assert(s);
1218 assert(fds);
1219 assert(fd_names);
1220 assert(n_socket_fds);
1221 assert(n_storage_fds);
1222
1223 if (s->socket_fd >= 0) {
1224
1225 /* Pass the per-connection socket */
1226
1227 rfds = new(int, 1);
1228 if (!rfds)
1229 return -ENOMEM;
1230 rfds[0] = s->socket_fd;
1231
1232 rfd_names = strv_new("connection");
1233 if (!rfd_names)
1234 return -ENOMEM;
1235
1236 rn_socket_fds = 1;
1237 } else {
1238 Iterator i;
1239 void *v;
1240 Unit *u;
1241
1242 /* Pass all our configured sockets for singleton services */
1243
1244 HASHMAP_FOREACH_KEY(v, u, UNIT(s)->dependencies[UNIT_TRIGGERED_BY], i) {
1245 _cleanup_free_ int *cfds = NULL;
1246 Socket *sock;
1247 int cn_fds;
1248
1249 if (u->type != UNIT_SOCKET)
1250 continue;
1251
1252 sock = SOCKET(u);
1253
1254 cn_fds = socket_collect_fds(sock, &cfds);
1255 if (cn_fds < 0)
1256 return cn_fds;
1257
1258 if (cn_fds <= 0)
1259 continue;
1260
1261 if (!rfds) {
1262 rfds = TAKE_PTR(cfds);
1263 rn_socket_fds = cn_fds;
1264 } else {
1265 int *t;
1266
1267 t = reallocarray(rfds, rn_socket_fds + cn_fds, sizeof(int));
1268 if (!t)
1269 return -ENOMEM;
1270
1271 memcpy(t + rn_socket_fds, cfds, cn_fds * sizeof(int));
1272
1273 rfds = t;
1274 rn_socket_fds += cn_fds;
1275 }
1276
1277 r = strv_extend_n(&rfd_names, socket_fdname(sock), cn_fds);
1278 if (r < 0)
1279 return r;
1280 }
1281 }
1282
1283 if (s->n_fd_store > 0) {
1284 ServiceFDStore *fs;
1285 size_t n_fds;
1286 char **nl;
1287 int *t;
1288
1289 t = reallocarray(rfds, rn_socket_fds + s->n_fd_store, sizeof(int));
1290 if (!t)
1291 return -ENOMEM;
1292
1293 rfds = t;
1294
1295 nl = reallocarray(rfd_names, rn_socket_fds + s->n_fd_store + 1, sizeof(char *));
1296 if (!nl)
1297 return -ENOMEM;
1298
1299 rfd_names = nl;
1300 n_fds = rn_socket_fds;
1301
1302 LIST_FOREACH(fd_store, fs, s->fd_store) {
1303 rfds[n_fds] = fs->fd;
1304 rfd_names[n_fds] = strdup(strempty(fs->fdname));
1305 if (!rfd_names[n_fds])
1306 return -ENOMEM;
1307
1308 rn_storage_fds++;
1309 n_fds++;
1310 }
1311
1312 rfd_names[n_fds] = NULL;
1313 }
1314
1315 *fds = TAKE_PTR(rfds);
1316 *fd_names = TAKE_PTR(rfd_names);
1317 *n_socket_fds = rn_socket_fds;
1318 *n_storage_fds = rn_storage_fds;
1319
1320 return 0;
1321 }
1322
1323 static int service_allocate_exec_fd_event_source(
1324 Service *s,
1325 int fd,
1326 sd_event_source **ret_event_source) {
1327
1328 _cleanup_(sd_event_source_unrefp) sd_event_source *source = NULL;
1329 int r;
1330
1331 assert(s);
1332 assert(fd >= 0);
1333 assert(ret_event_source);
1334
1335 r = sd_event_add_io(UNIT(s)->manager->event, &source, fd, 0, service_dispatch_exec_io, s);
1336 if (r < 0)
1337 return log_unit_error_errno(UNIT(s), r, "Failed to allocate exec_fd event source: %m");
1338
1339 /* This is a bit lower priority than SIGCHLD, as that carries a lot more interesting failure information */
1340
1341 r = sd_event_source_set_priority(source, SD_EVENT_PRIORITY_NORMAL-3);
1342 if (r < 0)
1343 return log_unit_error_errno(UNIT(s), r, "Failed to adjust priority of exec_fd event source: %m");
1344
1345 (void) sd_event_source_set_description(source, "service event_fd");
1346
1347 r = sd_event_source_set_io_fd_own(source, true);
1348 if (r < 0)
1349 return log_unit_error_errno(UNIT(s), r, "Failed to pass ownership of fd to event source: %m");
1350
1351 *ret_event_source = TAKE_PTR(source);
1352 return 0;
1353 }
1354
1355 static int service_allocate_exec_fd(
1356 Service *s,
1357 sd_event_source **ret_event_source,
1358 int* ret_exec_fd) {
1359
1360 _cleanup_close_pair_ int p[2] = { -1, -1 };
1361 int r;
1362
1363 assert(s);
1364 assert(ret_event_source);
1365 assert(ret_exec_fd);
1366
1367 if (pipe2(p, O_CLOEXEC|O_NONBLOCK) < 0)
1368 return log_unit_error_errno(UNIT(s), errno, "Failed to allocate exec_fd pipe: %m");
1369
1370 r = service_allocate_exec_fd_event_source(s, p[0], ret_event_source);
1371 if (r < 0)
1372 return r;
1373
1374 p[0] = -1;
1375 *ret_exec_fd = TAKE_FD(p[1]);
1376
1377 return 0;
1378 }
1379
1380 static bool service_exec_needs_notify_socket(Service *s, ExecFlags flags) {
1381 assert(s);
1382
1383 /* Notifications are accepted depending on the process and
1384 * the access setting of the service:
1385 * process: \ access: NONE MAIN EXEC ALL
1386 * main no yes yes yes
1387 * control no no yes yes
1388 * other (forked) no no no yes */
1389
1390 if (flags & EXEC_IS_CONTROL)
1391 /* A control process */
1392 return IN_SET(s->notify_access, NOTIFY_EXEC, NOTIFY_ALL);
1393
1394 /* We only spawn main processes and control processes, so any
1395 * process that is not a control process is a main process */
1396 return s->notify_access != NOTIFY_NONE;
1397 }
1398
1399 static int service_spawn(
1400 Service *s,
1401 ExecCommand *c,
1402 usec_t timeout,
1403 ExecFlags flags,
1404 pid_t *_pid) {
1405
1406 _cleanup_(exec_params_clear) ExecParameters exec_params = {
1407 .flags = flags,
1408 .stdin_fd = -1,
1409 .stdout_fd = -1,
1410 .stderr_fd = -1,
1411 .exec_fd = -1,
1412 };
1413 _cleanup_strv_free_ char **final_env = NULL, **our_env = NULL, **fd_names = NULL;
1414 _cleanup_(sd_event_source_unrefp) sd_event_source *exec_fd_source = NULL;
1415 size_t n_socket_fds = 0, n_storage_fds = 0, n_env = 0;
1416 _cleanup_close_ int exec_fd = -1;
1417 _cleanup_free_ int *fds = NULL;
1418 pid_t pid;
1419 int r;
1420
1421 assert(s);
1422 assert(c);
1423 assert(_pid);
1424
1425 r = unit_prepare_exec(UNIT(s)); /* This realizes the cgroup, among other things */
1426 if (r < 0)
1427 return r;
1428
1429 if (flags & EXEC_IS_CONTROL) {
1430 /* If this is a control process, mask the permissions/chroot application if this is requested. */
1431 if (s->permissions_start_only)
1432 exec_params.flags &= ~EXEC_APPLY_SANDBOXING;
1433 if (s->root_directory_start_only)
1434 exec_params.flags &= ~EXEC_APPLY_CHROOT;
1435 }
1436
1437 if ((flags & EXEC_PASS_FDS) ||
1438 s->exec_context.std_input == EXEC_INPUT_SOCKET ||
1439 s->exec_context.std_output == EXEC_OUTPUT_SOCKET ||
1440 s->exec_context.std_error == EXEC_OUTPUT_SOCKET) {
1441
1442 r = service_collect_fds(s, &fds, &fd_names, &n_socket_fds, &n_storage_fds);
1443 if (r < 0)
1444 return r;
1445
1446 log_unit_debug(UNIT(s), "Passing %zu fds to service", n_socket_fds + n_storage_fds);
1447 }
1448
1449 if (!FLAGS_SET(flags, EXEC_IS_CONTROL) && s->type == SERVICE_EXEC) {
1450 assert(!s->exec_fd_event_source);
1451
1452 r = service_allocate_exec_fd(s, &exec_fd_source, &exec_fd);
1453 if (r < 0)
1454 return r;
1455 }
1456
1457 r = service_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), timeout));
1458 if (r < 0)
1459 return r;
1460
1461 our_env = new0(char*, 9);
1462 if (!our_env)
1463 return -ENOMEM;
1464
1465 if (service_exec_needs_notify_socket(s, flags))
1466 if (asprintf(our_env + n_env++, "NOTIFY_SOCKET=%s", UNIT(s)->manager->notify_socket) < 0)
1467 return -ENOMEM;
1468
1469 if (s->main_pid > 0)
1470 if (asprintf(our_env + n_env++, "MAINPID="PID_FMT, s->main_pid) < 0)
1471 return -ENOMEM;
1472
1473 if (MANAGER_IS_USER(UNIT(s)->manager))
1474 if (asprintf(our_env + n_env++, "MANAGERPID="PID_FMT, getpid_cached()) < 0)
1475 return -ENOMEM;
1476
1477 if (s->socket_fd >= 0) {
1478 union sockaddr_union sa;
1479 socklen_t salen = sizeof(sa);
1480
1481 /* If this is a per-connection service instance, let's set $REMOTE_ADDR and $REMOTE_PORT to something
1482 * useful. Note that we do this only when we are still connected at this point in time, which we might
1483 * very well not be. Hence we ignore all errors when retrieving peer information (as that might result
1484 * in ENOTCONN), and just use whate we can use. */
1485
1486 if (getpeername(s->socket_fd, &sa.sa, &salen) >= 0 &&
1487 IN_SET(sa.sa.sa_family, AF_INET, AF_INET6, AF_VSOCK)) {
1488
1489 _cleanup_free_ char *addr = NULL;
1490 char *t;
1491 unsigned port;
1492
1493 r = sockaddr_pretty(&sa.sa, salen, true, false, &addr);
1494 if (r < 0)
1495 return r;
1496
1497 t = strappend("REMOTE_ADDR=", addr);
1498 if (!t)
1499 return -ENOMEM;
1500 our_env[n_env++] = t;
1501
1502 r = sockaddr_port(&sa.sa, &port);
1503 if (r < 0)
1504 return r;
1505
1506 if (asprintf(&t, "REMOTE_PORT=%u", port) < 0)
1507 return -ENOMEM;
1508 our_env[n_env++] = t;
1509 }
1510 }
1511
1512 if (flags & EXEC_SETENV_RESULT) {
1513 if (asprintf(our_env + n_env++, "SERVICE_RESULT=%s", service_result_to_string(s->result)) < 0)
1514 return -ENOMEM;
1515
1516 if (s->main_exec_status.pid > 0 &&
1517 dual_timestamp_is_set(&s->main_exec_status.exit_timestamp)) {
1518 if (asprintf(our_env + n_env++, "EXIT_CODE=%s", sigchld_code_to_string(s->main_exec_status.code)) < 0)
1519 return -ENOMEM;
1520
1521 if (s->main_exec_status.code == CLD_EXITED)
1522 r = asprintf(our_env + n_env++, "EXIT_STATUS=%i", s->main_exec_status.status);
1523 else
1524 r = asprintf(our_env + n_env++, "EXIT_STATUS=%s", signal_to_string(s->main_exec_status.status));
1525 if (r < 0)
1526 return -ENOMEM;
1527 }
1528 }
1529
1530 r = unit_set_exec_params(UNIT(s), &exec_params);
1531 if (r < 0)
1532 return r;
1533
1534 final_env = strv_env_merge(2, exec_params.environment, our_env, NULL);
1535 if (!final_env)
1536 return -ENOMEM;
1537
1538 /* System services should get a new keyring by default. */
1539 SET_FLAG(exec_params.flags, EXEC_NEW_KEYRING, MANAGER_IS_SYSTEM(UNIT(s)->manager));
1540
1541 /* System D-Bus needs nss-systemd disabled, so that we don't deadlock */
1542 SET_FLAG(exec_params.flags, EXEC_NSS_BYPASS_BUS,
1543 MANAGER_IS_SYSTEM(UNIT(s)->manager) && unit_has_name(UNIT(s), SPECIAL_DBUS_SERVICE));
1544
1545 strv_free_and_replace(exec_params.environment, final_env);
1546 exec_params.fds = fds;
1547 exec_params.fd_names = fd_names;
1548 exec_params.n_socket_fds = n_socket_fds;
1549 exec_params.n_storage_fds = n_storage_fds;
1550 exec_params.watchdog_usec = service_get_watchdog_usec(s);
1551 exec_params.selinux_context_net = s->socket_fd_selinux_context_net;
1552 if (s->type == SERVICE_IDLE)
1553 exec_params.idle_pipe = UNIT(s)->manager->idle_pipe;
1554 exec_params.stdin_fd = s->stdin_fd;
1555 exec_params.stdout_fd = s->stdout_fd;
1556 exec_params.stderr_fd = s->stderr_fd;
1557 exec_params.exec_fd = exec_fd;
1558
1559 r = exec_spawn(UNIT(s),
1560 c,
1561 &s->exec_context,
1562 &exec_params,
1563 s->exec_runtime,
1564 &s->dynamic_creds,
1565 &pid);
1566 if (r < 0)
1567 return r;
1568
1569 s->exec_fd_event_source = TAKE_PTR(exec_fd_source);
1570 s->exec_fd_hot = false;
1571
1572 r = unit_watch_pid(UNIT(s), pid);
1573 if (r < 0) /* FIXME: we need to do something here */
1574 return r;
1575
1576 *_pid = pid;
1577
1578 return 0;
1579 }
1580
1581 static int main_pid_good(Service *s) {
1582 assert(s);
1583
1584 /* Returns 0 if the pid is dead, > 0 if it is good, < 0 if we don't know */
1585
1586 /* If we know the pid file, then let's just check if it is
1587 * still valid */
1588 if (s->main_pid_known) {
1589
1590 /* If it's an alien child let's check if it is still
1591 * alive ... */
1592 if (s->main_pid_alien && s->main_pid > 0)
1593 return pid_is_alive(s->main_pid);
1594
1595 /* .. otherwise assume we'll get a SIGCHLD for it,
1596 * which we really should wait for to collect exit
1597 * status and code */
1598 return s->main_pid > 0;
1599 }
1600
1601 /* We don't know the pid */
1602 return -EAGAIN;
1603 }
1604
1605 static int control_pid_good(Service *s) {
1606 assert(s);
1607
1608 /* Returns 0 if the control PID is dead, > 0 if it is good. We never actually return < 0 here, but in order to
1609 * make this function as similar as possible to main_pid_good() and cgroup_good(), we pretend that < 0 also
1610 * means: we can't figure it out. */
1611
1612 return s->control_pid > 0;
1613 }
1614
1615 static int cgroup_good(Service *s) {
1616 int r;
1617
1618 assert(s);
1619
1620 /* Returns 0 if the cgroup is empty or doesn't exist, > 0 if it is exists and is populated, < 0 if we can't
1621 * figure it out */
1622
1623 if (!UNIT(s)->cgroup_path)
1624 return 0;
1625
1626 r = cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER, UNIT(s)->cgroup_path);
1627 if (r < 0)
1628 return r;
1629
1630 return r == 0;
1631 }
1632
1633 static bool service_shall_restart(Service *s) {
1634 assert(s);
1635
1636 /* Don't restart after manual stops */
1637 if (s->forbid_restart)
1638 return false;
1639
1640 /* Never restart if this is configured as special exception */
1641 if (exit_status_set_test(&s->restart_prevent_status, s->main_exec_status.code, s->main_exec_status.status))
1642 return false;
1643
1644 /* Restart if the exit code/status are configured as restart triggers */
1645 if (exit_status_set_test(&s->restart_force_status, s->main_exec_status.code, s->main_exec_status.status))
1646 return true;
1647
1648 switch (s->restart) {
1649
1650 case SERVICE_RESTART_NO:
1651 return false;
1652
1653 case SERVICE_RESTART_ALWAYS:
1654 return true;
1655
1656 case SERVICE_RESTART_ON_SUCCESS:
1657 return s->result == SERVICE_SUCCESS;
1658
1659 case SERVICE_RESTART_ON_FAILURE:
1660 return s->result != SERVICE_SUCCESS;
1661
1662 case SERVICE_RESTART_ON_ABNORMAL:
1663 return !IN_SET(s->result, SERVICE_SUCCESS, SERVICE_FAILURE_EXIT_CODE);
1664
1665 case SERVICE_RESTART_ON_WATCHDOG:
1666 return s->result == SERVICE_FAILURE_WATCHDOG;
1667
1668 case SERVICE_RESTART_ON_ABORT:
1669 return IN_SET(s->result, SERVICE_FAILURE_SIGNAL, SERVICE_FAILURE_CORE_DUMP);
1670
1671 default:
1672 assert_not_reached("unknown restart setting");
1673 }
1674 }
1675
1676 static bool service_will_restart(Unit *u) {
1677 Service *s = SERVICE(u);
1678
1679 assert(s);
1680
1681 if (s->will_auto_restart)
1682 return true;
1683 if (s->state == SERVICE_AUTO_RESTART)
1684 return true;
1685 if (!UNIT(s)->job)
1686 return false;
1687 if (UNIT(s)->job->type == JOB_START)
1688 return true;
1689
1690 return false;
1691 }
1692
1693 static void service_enter_dead(Service *s, ServiceResult f, bool allow_restart) {
1694 int r;
1695
1696 assert(s);
1697
1698 /* If there's a stop job queued before we enter the DEAD state, we shouldn't act on Restart=, in order to not
1699 * undo what has already been enqueued. */
1700 if (unit_stop_pending(UNIT(s)))
1701 allow_restart = false;
1702
1703 if (s->result == SERVICE_SUCCESS)
1704 s->result = f;
1705
1706 unit_log_result(UNIT(s), s->result == SERVICE_SUCCESS, service_result_to_string(s->result));
1707
1708 if (allow_restart && service_shall_restart(s))
1709 s->will_auto_restart = true;
1710
1711 /* Make sure service_release_resources() doesn't destroy our FD store, while we are changing through
1712 * SERVICE_FAILED/SERVICE_DEAD before entering into SERVICE_AUTO_RESTART. */
1713 s->n_keep_fd_store ++;
1714
1715 service_set_state(s, s->result != SERVICE_SUCCESS ? SERVICE_FAILED : SERVICE_DEAD);
1716
1717 if (s->will_auto_restart) {
1718 s->will_auto_restart = false;
1719
1720 r = service_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->restart_usec));
1721 if (r < 0) {
1722 s->n_keep_fd_store--;
1723 goto fail;
1724 }
1725
1726 service_set_state(s, SERVICE_AUTO_RESTART);
1727 } else
1728 /* If we shan't restart, then flush out the restart counter. But don't do that immediately, so that the
1729 * user can still introspect the counter. Do so on the next start. */
1730 s->flush_n_restarts = true;
1731
1732 /* The new state is in effect, let's decrease the fd store ref counter again. Let's also readd us to the GC
1733 * queue, so that the fd store is possibly gc'ed again */
1734 s->n_keep_fd_store--;
1735 unit_add_to_gc_queue(UNIT(s));
1736
1737 /* The next restart might not be a manual stop, hence reset the flag indicating manual stops */
1738 s->forbid_restart = false;
1739
1740 /* We want fresh tmpdirs in case service is started again immediately */
1741 s->exec_runtime = exec_runtime_unref(s->exec_runtime, true);
1742
1743 if (s->exec_context.runtime_directory_preserve_mode == EXEC_PRESERVE_NO ||
1744 (s->exec_context.runtime_directory_preserve_mode == EXEC_PRESERVE_RESTART && !service_will_restart(UNIT(s))))
1745 /* Also, remove the runtime directory */
1746 exec_context_destroy_runtime_directory(&s->exec_context, UNIT(s)->manager->prefix[EXEC_DIRECTORY_RUNTIME]);
1747
1748 /* Get rid of the IPC bits of the user */
1749 unit_unref_uid_gid(UNIT(s), true);
1750
1751 /* Release the user, and destroy it if we are the only remaining owner */
1752 dynamic_creds_destroy(&s->dynamic_creds);
1753
1754 /* Try to delete the pid file. At this point it will be
1755 * out-of-date, and some software might be confused by it, so
1756 * let's remove it. */
1757 if (s->pid_file)
1758 (void) unlink(s->pid_file);
1759
1760 return;
1761
1762 fail:
1763 log_unit_warning_errno(UNIT(s), r, "Failed to run install restart timer: %m");
1764 service_enter_dead(s, SERVICE_FAILURE_RESOURCES, false);
1765 }
1766
1767 static void service_enter_stop_post(Service *s, ServiceResult f) {
1768 int r;
1769 assert(s);
1770
1771 if (s->result == SERVICE_SUCCESS)
1772 s->result = f;
1773
1774 service_unwatch_control_pid(s);
1775 (void) unit_enqueue_rewatch_pids(UNIT(s));
1776
1777 s->control_command = s->exec_command[SERVICE_EXEC_STOP_POST];
1778 if (s->control_command) {
1779 s->control_command_id = SERVICE_EXEC_STOP_POST;
1780
1781 r = service_spawn(s,
1782 s->control_command,
1783 s->timeout_stop_usec,
1784 EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN|EXEC_IS_CONTROL|EXEC_SETENV_RESULT|EXEC_CONTROL_CGROUP,
1785 &s->control_pid);
1786 if (r < 0)
1787 goto fail;
1788
1789 service_set_state(s, SERVICE_STOP_POST);
1790 } else
1791 service_enter_signal(s, SERVICE_FINAL_SIGTERM, SERVICE_SUCCESS);
1792
1793 return;
1794
1795 fail:
1796 log_unit_warning_errno(UNIT(s), r, "Failed to run 'stop-post' task: %m");
1797 service_enter_signal(s, SERVICE_FINAL_SIGTERM, SERVICE_FAILURE_RESOURCES);
1798 }
1799
1800 static int state_to_kill_operation(ServiceState state) {
1801 switch (state) {
1802
1803 case SERVICE_STOP_WATCHDOG:
1804 return KILL_WATCHDOG;
1805
1806 case SERVICE_STOP_SIGTERM:
1807 case SERVICE_FINAL_SIGTERM:
1808 return KILL_TERMINATE;
1809
1810 case SERVICE_STOP_SIGKILL:
1811 case SERVICE_FINAL_SIGKILL:
1812 return KILL_KILL;
1813
1814 default:
1815 return _KILL_OPERATION_INVALID;
1816 }
1817 }
1818
1819 static void service_enter_signal(Service *s, ServiceState state, ServiceResult f) {
1820 int r;
1821
1822 assert(s);
1823
1824 if (s->result == SERVICE_SUCCESS)
1825 s->result = f;
1826
1827 /* Before sending any signal, make sure we track all members of this cgroup */
1828 (void) unit_watch_all_pids(UNIT(s));
1829
1830 /* Also, enqueue a job that we recheck all our PIDs a bit later, given that it's likely some processes have
1831 * died now */
1832 (void) unit_enqueue_rewatch_pids(UNIT(s));
1833
1834 r = unit_kill_context(
1835 UNIT(s),
1836 &s->kill_context,
1837 state_to_kill_operation(state),
1838 s->main_pid,
1839 s->control_pid,
1840 s->main_pid_alien);
1841 if (r < 0)
1842 goto fail;
1843
1844 if (r > 0) {
1845 r = service_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_stop_usec));
1846 if (r < 0)
1847 goto fail;
1848
1849 service_set_state(s, state);
1850 } else if (IN_SET(state, SERVICE_STOP_WATCHDOG, SERVICE_STOP_SIGTERM) && s->kill_context.send_sigkill)
1851 service_enter_signal(s, SERVICE_STOP_SIGKILL, SERVICE_SUCCESS);
1852 else if (IN_SET(state, SERVICE_STOP_WATCHDOG, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL))
1853 service_enter_stop_post(s, SERVICE_SUCCESS);
1854 else if (state == SERVICE_FINAL_SIGTERM && s->kill_context.send_sigkill)
1855 service_enter_signal(s, SERVICE_FINAL_SIGKILL, SERVICE_SUCCESS);
1856 else
1857 service_enter_dead(s, SERVICE_SUCCESS, true);
1858
1859 return;
1860
1861 fail:
1862 log_unit_warning_errno(UNIT(s), r, "Failed to kill processes: %m");
1863
1864 if (IN_SET(state, SERVICE_STOP_WATCHDOG, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL))
1865 service_enter_stop_post(s, SERVICE_FAILURE_RESOURCES);
1866 else
1867 service_enter_dead(s, SERVICE_FAILURE_RESOURCES, true);
1868 }
1869
1870 static void service_enter_stop_by_notify(Service *s) {
1871 assert(s);
1872
1873 (void) unit_enqueue_rewatch_pids(UNIT(s));
1874
1875 service_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_stop_usec));
1876
1877 /* The service told us it's stopping, so it's as if we SIGTERM'd it. */
1878 service_set_state(s, SERVICE_STOP_SIGTERM);
1879 }
1880
1881 static void service_enter_stop(Service *s, ServiceResult f) {
1882 int r;
1883
1884 assert(s);
1885
1886 if (s->result == SERVICE_SUCCESS)
1887 s->result = f;
1888
1889 service_unwatch_control_pid(s);
1890 (void) unit_enqueue_rewatch_pids(UNIT(s));
1891
1892 s->control_command = s->exec_command[SERVICE_EXEC_STOP];
1893 if (s->control_command) {
1894 s->control_command_id = SERVICE_EXEC_STOP;
1895
1896 r = service_spawn(s,
1897 s->control_command,
1898 s->timeout_stop_usec,
1899 EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_IS_CONTROL|EXEC_SETENV_RESULT|EXEC_CONTROL_CGROUP,
1900 &s->control_pid);
1901 if (r < 0)
1902 goto fail;
1903
1904 service_set_state(s, SERVICE_STOP);
1905 } else
1906 service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_SUCCESS);
1907
1908 return;
1909
1910 fail:
1911 log_unit_warning_errno(UNIT(s), r, "Failed to run 'stop' task: %m");
1912 service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_FAILURE_RESOURCES);
1913 }
1914
1915 static bool service_good(Service *s) {
1916 int main_pid_ok;
1917 assert(s);
1918
1919 if (s->type == SERVICE_DBUS && !s->bus_name_good)
1920 return false;
1921
1922 main_pid_ok = main_pid_good(s);
1923 if (main_pid_ok > 0) /* It's alive */
1924 return true;
1925 if (main_pid_ok == 0) /* It's dead */
1926 return false;
1927
1928 /* OK, we don't know anything about the main PID, maybe
1929 * because there is none. Let's check the control group
1930 * instead. */
1931
1932 return cgroup_good(s) != 0;
1933 }
1934
1935 static void service_enter_running(Service *s, ServiceResult f) {
1936 assert(s);
1937
1938 if (s->result == SERVICE_SUCCESS)
1939 s->result = f;
1940
1941 service_unwatch_control_pid(s);
1942
1943 if (s->result != SERVICE_SUCCESS)
1944 service_enter_signal(s, SERVICE_STOP_SIGTERM, f);
1945 else if (service_good(s)) {
1946
1947 /* If there are any queued up sd_notify() notifications, process them now */
1948 if (s->notify_state == NOTIFY_RELOADING)
1949 service_enter_reload_by_notify(s);
1950 else if (s->notify_state == NOTIFY_STOPPING)
1951 service_enter_stop_by_notify(s);
1952 else {
1953 service_set_state(s, SERVICE_RUNNING);
1954 service_arm_timer(s, usec_add(UNIT(s)->active_enter_timestamp.monotonic, s->runtime_max_usec));
1955 }
1956
1957 } else if (s->remain_after_exit)
1958 service_set_state(s, SERVICE_EXITED);
1959 else
1960 service_enter_stop(s, SERVICE_SUCCESS);
1961 }
1962
1963 static void service_enter_start_post(Service *s) {
1964 int r;
1965 assert(s);
1966
1967 service_unwatch_control_pid(s);
1968 service_reset_watchdog(s);
1969
1970 s->control_command = s->exec_command[SERVICE_EXEC_START_POST];
1971 if (s->control_command) {
1972 s->control_command_id = SERVICE_EXEC_START_POST;
1973
1974 r = service_spawn(s,
1975 s->control_command,
1976 s->timeout_start_usec,
1977 EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_IS_CONTROL|EXEC_CONTROL_CGROUP,
1978 &s->control_pid);
1979 if (r < 0)
1980 goto fail;
1981
1982 service_set_state(s, SERVICE_START_POST);
1983 } else
1984 service_enter_running(s, SERVICE_SUCCESS);
1985
1986 return;
1987
1988 fail:
1989 log_unit_warning_errno(UNIT(s), r, "Failed to run 'start-post' task: %m");
1990 service_enter_stop(s, SERVICE_FAILURE_RESOURCES);
1991 }
1992
1993 static void service_kill_control_process(Service *s) {
1994 int r;
1995
1996 assert(s);
1997
1998 if (s->control_pid <= 0)
1999 return;
2000
2001 r = kill_and_sigcont(s->control_pid, SIGKILL);
2002 if (r < 0) {
2003 _cleanup_free_ char *comm = NULL;
2004
2005 (void) get_process_comm(s->control_pid, &comm);
2006
2007 log_unit_debug_errno(UNIT(s), r, "Failed to kill control process " PID_FMT " (%s), ignoring: %m",
2008 s->control_pid, strna(comm));
2009 }
2010 }
2011
2012 static void service_enter_start(Service *s) {
2013 ExecCommand *c;
2014 usec_t timeout;
2015 pid_t pid;
2016 int r;
2017
2018 assert(s);
2019
2020 service_unwatch_control_pid(s);
2021 service_unwatch_main_pid(s);
2022
2023 unit_warn_leftover_processes(UNIT(s));
2024
2025 if (s->type == SERVICE_FORKING) {
2026 s->control_command_id = SERVICE_EXEC_START;
2027 c = s->control_command = s->exec_command[SERVICE_EXEC_START];
2028
2029 s->main_command = NULL;
2030 } else {
2031 s->control_command_id = _SERVICE_EXEC_COMMAND_INVALID;
2032 s->control_command = NULL;
2033
2034 c = s->main_command = s->exec_command[SERVICE_EXEC_START];
2035 }
2036
2037 if (!c) {
2038 if (s->type != SERVICE_ONESHOT) {
2039 /* There's no command line configured for the main command? Hmm, that is strange. This can only
2040 * happen if the configuration changes at runtime. In this case, let's enter a failure
2041 * state. */
2042 log_unit_error(UNIT(s), "There's no 'start' task anymore we could start.");
2043 r = -ENXIO;
2044 goto fail;
2045 }
2046
2047 /* We force a fake state transition here. Otherwise, the unit would go directly from
2048 * SERVICE_DEAD to SERVICE_DEAD without SERVICE_ACTIVATING or SERVICE_ACTIVE
2049 * inbetween. This way we can later trigger actions that depend on the state
2050 * transition, including SuccessAction=. */
2051 service_set_state(s, SERVICE_START);
2052
2053 service_enter_start_post(s);
2054 return;
2055 }
2056
2057 if (IN_SET(s->type, SERVICE_SIMPLE, SERVICE_IDLE))
2058 /* For simple + idle this is the main process. We don't apply any timeout here, but
2059 * service_enter_running() will later apply the .runtime_max_usec timeout. */
2060 timeout = USEC_INFINITY;
2061 else
2062 timeout = s->timeout_start_usec;
2063
2064 r = service_spawn(s,
2065 c,
2066 timeout,
2067 EXEC_PASS_FDS|EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN|EXEC_SET_WATCHDOG,
2068 &pid);
2069 if (r < 0)
2070 goto fail;
2071
2072 if (IN_SET(s->type, SERVICE_SIMPLE, SERVICE_IDLE)) {
2073 /* For simple services we immediately start
2074 * the START_POST binaries. */
2075
2076 service_set_main_pid(s, pid);
2077 service_enter_start_post(s);
2078
2079 } else if (s->type == SERVICE_FORKING) {
2080
2081 /* For forking services we wait until the start
2082 * process exited. */
2083
2084 s->control_pid = pid;
2085 service_set_state(s, SERVICE_START);
2086
2087 } else if (IN_SET(s->type, SERVICE_ONESHOT, SERVICE_DBUS, SERVICE_NOTIFY, SERVICE_EXEC)) {
2088
2089 /* For oneshot services we wait until the start process exited, too, but it is our main process. */
2090
2091 /* For D-Bus services we know the main pid right away, but wait for the bus name to appear on the
2092 * bus. 'notify' and 'exec' services are similar. */
2093
2094 service_set_main_pid(s, pid);
2095 service_set_state(s, SERVICE_START);
2096 } else
2097 assert_not_reached("Unknown service type");
2098
2099 return;
2100
2101 fail:
2102 log_unit_warning_errno(UNIT(s), r, "Failed to run 'start' task: %m");
2103 service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_FAILURE_RESOURCES);
2104 }
2105
2106 static void service_enter_start_pre(Service *s) {
2107 int r;
2108
2109 assert(s);
2110
2111 service_unwatch_control_pid(s);
2112
2113 s->control_command = s->exec_command[SERVICE_EXEC_START_PRE];
2114 if (s->control_command) {
2115
2116 unit_warn_leftover_processes(UNIT(s));
2117
2118 s->control_command_id = SERVICE_EXEC_START_PRE;
2119
2120 r = service_spawn(s,
2121 s->control_command,
2122 s->timeout_start_usec,
2123 EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_IS_CONTROL|EXEC_APPLY_TTY_STDIN,
2124 &s->control_pid);
2125 if (r < 0)
2126 goto fail;
2127
2128 service_set_state(s, SERVICE_START_PRE);
2129 } else
2130 service_enter_start(s);
2131
2132 return;
2133
2134 fail:
2135 log_unit_warning_errno(UNIT(s), r, "Failed to run 'start-pre' task: %m");
2136 service_enter_dead(s, SERVICE_FAILURE_RESOURCES, true);
2137 }
2138
2139 static void service_enter_restart(Service *s) {
2140 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
2141 int r;
2142
2143 assert(s);
2144
2145 if (UNIT(s)->job && UNIT(s)->job->type == JOB_STOP) {
2146 /* Don't restart things if we are going down anyway */
2147 log_unit_info(UNIT(s), "Stop job pending for unit, delaying automatic restart.");
2148
2149 r = service_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->restart_usec));
2150 if (r < 0)
2151 goto fail;
2152
2153 return;
2154 }
2155
2156 /* Any units that are bound to this service must also be
2157 * restarted. We use JOB_RESTART (instead of the more obvious
2158 * JOB_START) here so that those dependency jobs will be added
2159 * as well. */
2160 r = manager_add_job(UNIT(s)->manager, JOB_RESTART, UNIT(s), JOB_FAIL, &error, NULL);
2161 if (r < 0)
2162 goto fail;
2163
2164 /* Count the jobs we enqueue for restarting. This counter is maintained as long as the unit isn't fully
2165 * stopped, i.e. as long as it remains up or remains in auto-start states. The use can reset the counter
2166 * explicitly however via the usual "systemctl reset-failure" logic. */
2167 s->n_restarts ++;
2168 s->flush_n_restarts = false;
2169
2170 log_struct(LOG_INFO,
2171 "MESSAGE_ID=" SD_MESSAGE_UNIT_RESTART_SCHEDULED_STR,
2172 LOG_UNIT_ID(UNIT(s)),
2173 LOG_UNIT_INVOCATION_ID(UNIT(s)),
2174 LOG_UNIT_MESSAGE(UNIT(s), "Scheduled restart job, restart counter is at %u.", s->n_restarts),
2175 "N_RESTARTS=%u", s->n_restarts);
2176
2177 /* Notify clients about changed restart counter */
2178 unit_add_to_dbus_queue(UNIT(s));
2179
2180 /* Note that we stay in the SERVICE_AUTO_RESTART state here,
2181 * it will be canceled as part of the service_stop() call that
2182 * is executed as part of JOB_RESTART. */
2183
2184 return;
2185
2186 fail:
2187 log_unit_warning(UNIT(s), "Failed to schedule restart job: %s", bus_error_message(&error, -r));
2188 service_enter_dead(s, SERVICE_FAILURE_RESOURCES, false);
2189 }
2190
2191 static void service_enter_reload_by_notify(Service *s) {
2192 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
2193 int r;
2194
2195 assert(s);
2196
2197 service_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_start_usec));
2198 service_set_state(s, SERVICE_RELOAD);
2199
2200 /* service_enter_reload_by_notify is never called during a reload, thus no loops are possible. */
2201 r = manager_propagate_reload(UNIT(s)->manager, UNIT(s), JOB_FAIL, &error);
2202 if (r < 0)
2203 log_unit_warning(UNIT(s), "Failed to schedule propagation of reload: %s", bus_error_message(&error, -r));
2204 }
2205
2206 static void service_enter_reload(Service *s) {
2207 int r;
2208
2209 assert(s);
2210
2211 service_unwatch_control_pid(s);
2212 s->reload_result = SERVICE_SUCCESS;
2213
2214 s->control_command = s->exec_command[SERVICE_EXEC_RELOAD];
2215 if (s->control_command) {
2216 s->control_command_id = SERVICE_EXEC_RELOAD;
2217
2218 r = service_spawn(s,
2219 s->control_command,
2220 s->timeout_start_usec,
2221 EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_IS_CONTROL|EXEC_CONTROL_CGROUP,
2222 &s->control_pid);
2223 if (r < 0)
2224 goto fail;
2225
2226 service_set_state(s, SERVICE_RELOAD);
2227 } else
2228 service_enter_running(s, SERVICE_SUCCESS);
2229
2230 return;
2231
2232 fail:
2233 log_unit_warning_errno(UNIT(s), r, "Failed to run 'reload' task: %m");
2234 s->reload_result = SERVICE_FAILURE_RESOURCES;
2235 service_enter_running(s, SERVICE_SUCCESS);
2236 }
2237
2238 static void service_run_next_control(Service *s) {
2239 usec_t timeout;
2240 int r;
2241
2242 assert(s);
2243 assert(s->control_command);
2244 assert(s->control_command->command_next);
2245
2246 assert(s->control_command_id != SERVICE_EXEC_START);
2247
2248 s->control_command = s->control_command->command_next;
2249 service_unwatch_control_pid(s);
2250
2251 if (IN_SET(s->state, SERVICE_START_PRE, SERVICE_START, SERVICE_START_POST, SERVICE_RUNNING, SERVICE_RELOAD))
2252 timeout = s->timeout_start_usec;
2253 else
2254 timeout = s->timeout_stop_usec;
2255
2256 r = service_spawn(s,
2257 s->control_command,
2258 timeout,
2259 EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_IS_CONTROL|
2260 (IN_SET(s->control_command_id, SERVICE_EXEC_START_PRE, SERVICE_EXEC_STOP_POST) ? EXEC_APPLY_TTY_STDIN : 0)|
2261 (IN_SET(s->control_command_id, SERVICE_EXEC_STOP, SERVICE_EXEC_STOP_POST) ? EXEC_SETENV_RESULT : 0)|
2262 (IN_SET(s->control_command_id, SERVICE_EXEC_START_POST, SERVICE_EXEC_RELOAD, SERVICE_EXEC_STOP, SERVICE_EXEC_STOP_POST) ? EXEC_CONTROL_CGROUP : 0),
2263 &s->control_pid);
2264 if (r < 0)
2265 goto fail;
2266
2267 return;
2268
2269 fail:
2270 log_unit_warning_errno(UNIT(s), r, "Failed to run next control task: %m");
2271
2272 if (IN_SET(s->state, SERVICE_START_PRE, SERVICE_START_POST, SERVICE_STOP))
2273 service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_FAILURE_RESOURCES);
2274 else if (s->state == SERVICE_STOP_POST)
2275 service_enter_dead(s, SERVICE_FAILURE_RESOURCES, true);
2276 else if (s->state == SERVICE_RELOAD) {
2277 s->reload_result = SERVICE_FAILURE_RESOURCES;
2278 service_enter_running(s, SERVICE_SUCCESS);
2279 } else
2280 service_enter_stop(s, SERVICE_FAILURE_RESOURCES);
2281 }
2282
2283 static void service_run_next_main(Service *s) {
2284 pid_t pid;
2285 int r;
2286
2287 assert(s);
2288 assert(s->main_command);
2289 assert(s->main_command->command_next);
2290 assert(s->type == SERVICE_ONESHOT);
2291
2292 s->main_command = s->main_command->command_next;
2293 service_unwatch_main_pid(s);
2294
2295 r = service_spawn(s,
2296 s->main_command,
2297 s->timeout_start_usec,
2298 EXEC_PASS_FDS|EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN|EXEC_SET_WATCHDOG,
2299 &pid);
2300 if (r < 0)
2301 goto fail;
2302
2303 service_set_main_pid(s, pid);
2304
2305 return;
2306
2307 fail:
2308 log_unit_warning_errno(UNIT(s), r, "Failed to run next main task: %m");
2309 service_enter_stop(s, SERVICE_FAILURE_RESOURCES);
2310 }
2311
2312 static int service_start(Unit *u) {
2313 Service *s = SERVICE(u);
2314 int r;
2315
2316 assert(s);
2317
2318 /* We cannot fulfill this request right now, try again later
2319 * please! */
2320 if (IN_SET(s->state,
2321 SERVICE_STOP, SERVICE_STOP_WATCHDOG, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL, SERVICE_STOP_POST,
2322 SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL))
2323 return -EAGAIN;
2324
2325 /* Already on it! */
2326 if (IN_SET(s->state, SERVICE_START_PRE, SERVICE_START, SERVICE_START_POST))
2327 return 0;
2328
2329 /* A service that will be restarted must be stopped first to
2330 * trigger BindsTo and/or OnFailure dependencies. If a user
2331 * does not want to wait for the holdoff time to elapse, the
2332 * service should be manually restarted, not started. We
2333 * simply return EAGAIN here, so that any start jobs stay
2334 * queued, and assume that the auto restart timer will
2335 * eventually trigger the restart. */
2336 if (s->state == SERVICE_AUTO_RESTART)
2337 return -EAGAIN;
2338
2339 assert(IN_SET(s->state, SERVICE_DEAD, SERVICE_FAILED));
2340
2341 /* Make sure we don't enter a busy loop of some kind. */
2342 r = unit_start_limit_test(u);
2343 if (r < 0) {
2344 service_enter_dead(s, SERVICE_FAILURE_START_LIMIT_HIT, false);
2345 return r;
2346 }
2347
2348 r = unit_acquire_invocation_id(u);
2349 if (r < 0)
2350 return r;
2351
2352 s->result = SERVICE_SUCCESS;
2353 s->reload_result = SERVICE_SUCCESS;
2354 s->main_pid_known = false;
2355 s->main_pid_alien = false;
2356 s->forbid_restart = false;
2357
2358 s->status_text = mfree(s->status_text);
2359 s->status_errno = 0;
2360
2361 s->notify_state = NOTIFY_UNKNOWN;
2362
2363 s->watchdog_original_usec = s->watchdog_usec;
2364 s->watchdog_override_enable = false;
2365 s->watchdog_override_usec = USEC_INFINITY;
2366
2367 exec_command_reset_status_list_array(s->exec_command, _SERVICE_EXEC_COMMAND_MAX);
2368 exec_status_reset(&s->main_exec_status);
2369
2370 /* This is not an automatic restart? Flush the restart counter then */
2371 if (s->flush_n_restarts) {
2372 s->n_restarts = 0;
2373 s->flush_n_restarts = false;
2374 }
2375
2376 u->reset_accounting = true;
2377
2378 service_enter_start_pre(s);
2379 return 1;
2380 }
2381
2382 static int service_stop(Unit *u) {
2383 Service *s = SERVICE(u);
2384
2385 assert(s);
2386
2387 /* Don't create restart jobs from manual stops. */
2388 s->forbid_restart = true;
2389
2390 /* Already on it */
2391 if (IN_SET(s->state,
2392 SERVICE_STOP, SERVICE_STOP_WATCHDOG, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL, SERVICE_STOP_POST,
2393 SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL))
2394 return 0;
2395
2396 /* A restart will be scheduled or is in progress. */
2397 if (s->state == SERVICE_AUTO_RESTART) {
2398 service_set_state(s, SERVICE_DEAD);
2399 return 0;
2400 }
2401
2402 /* If there's already something running we go directly into
2403 * kill mode. */
2404 if (IN_SET(s->state, SERVICE_START_PRE, SERVICE_START, SERVICE_START_POST, SERVICE_RELOAD)) {
2405 service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_SUCCESS);
2406 return 0;
2407 }
2408
2409 assert(IN_SET(s->state, SERVICE_RUNNING, SERVICE_EXITED));
2410
2411 service_enter_stop(s, SERVICE_SUCCESS);
2412 return 1;
2413 }
2414
2415 static int service_reload(Unit *u) {
2416 Service *s = SERVICE(u);
2417
2418 assert(s);
2419
2420 assert(IN_SET(s->state, SERVICE_RUNNING, SERVICE_EXITED));
2421
2422 service_enter_reload(s);
2423 return 1;
2424 }
2425
2426 _pure_ static bool service_can_reload(Unit *u) {
2427 Service *s = SERVICE(u);
2428
2429 assert(s);
2430
2431 return !!s->exec_command[SERVICE_EXEC_RELOAD];
2432 }
2433
2434 static unsigned service_exec_command_index(Unit *u, ServiceExecCommand id, ExecCommand *current) {
2435 Service *s = SERVICE(u);
2436 unsigned idx = 0;
2437 ExecCommand *first, *c;
2438
2439 assert(s);
2440
2441 first = s->exec_command[id];
2442
2443 /* Figure out where we are in the list by walking back to the beginning */
2444 for (c = current; c != first; c = c->command_prev)
2445 idx++;
2446
2447 return idx;
2448 }
2449
2450 static int service_serialize_exec_command(Unit *u, FILE *f, ExecCommand *command) {
2451 _cleanup_free_ char *args = NULL, *p = NULL;
2452 size_t allocated = 0, length = 0;
2453 Service *s = SERVICE(u);
2454 const char *type, *key;
2455 ServiceExecCommand id;
2456 unsigned idx;
2457 char **arg;
2458
2459 assert(s);
2460 assert(f);
2461
2462 if (!command)
2463 return 0;
2464
2465 if (command == s->control_command) {
2466 type = "control";
2467 id = s->control_command_id;
2468 } else {
2469 type = "main";
2470 id = SERVICE_EXEC_START;
2471 }
2472
2473 idx = service_exec_command_index(u, id, command);
2474
2475 STRV_FOREACH(arg, command->argv) {
2476 _cleanup_free_ char *e = NULL;
2477 size_t n;
2478
2479 e = cescape(*arg);
2480 if (!e)
2481 return log_oom();
2482
2483 n = strlen(e);
2484 if (!GREEDY_REALLOC(args, allocated, length + 1 + n + 1))
2485 return log_oom();
2486
2487 if (length > 0)
2488 args[length++] = ' ';
2489
2490 memcpy(args + length, e, n);
2491 length += n;
2492 }
2493
2494 if (!GREEDY_REALLOC(args, allocated, length + 1))
2495 return log_oom();
2496
2497 args[length++] = 0;
2498
2499 p = cescape(command->path);
2500 if (!p)
2501 return -ENOMEM;
2502
2503 key = strjoina(type, "-command");
2504 return serialize_item_format(f, key, "%s %u %s %s", service_exec_command_to_string(id), idx, p, args);
2505 }
2506
2507 static int service_serialize(Unit *u, FILE *f, FDSet *fds) {
2508 Service *s = SERVICE(u);
2509 ServiceFDStore *fs;
2510 int r;
2511
2512 assert(u);
2513 assert(f);
2514 assert(fds);
2515
2516 (void) serialize_item(f, "state", service_state_to_string(s->state));
2517 (void) serialize_item(f, "result", service_result_to_string(s->result));
2518 (void) serialize_item(f, "reload-result", service_result_to_string(s->reload_result));
2519
2520 if (s->control_pid > 0)
2521 (void) serialize_item_format(f, "control-pid", PID_FMT, s->control_pid);
2522
2523 if (s->main_pid_known && s->main_pid > 0)
2524 (void) serialize_item_format(f, "main-pid", PID_FMT, s->main_pid);
2525
2526 (void) serialize_bool(f, "main-pid-known", s->main_pid_known);
2527 (void) serialize_bool(f, "bus-name-good", s->bus_name_good);
2528 (void) serialize_bool(f, "bus-name-owner", s->bus_name_owner);
2529
2530 (void) serialize_item_format(f, "n-restarts", "%u", s->n_restarts);
2531 (void) serialize_bool(f, "flush-n-restarts", s->flush_n_restarts);
2532
2533 r = serialize_item_escaped(f, "status-text", s->status_text);
2534 if (r < 0)
2535 return r;
2536
2537 service_serialize_exec_command(u, f, s->control_command);
2538 service_serialize_exec_command(u, f, s->main_command);
2539
2540 r = serialize_fd(f, fds, "stdin-fd", s->stdin_fd);
2541 if (r < 0)
2542 return r;
2543 r = serialize_fd(f, fds, "stdout-fd", s->stdout_fd);
2544 if (r < 0)
2545 return r;
2546 r = serialize_fd(f, fds, "stderr-fd", s->stderr_fd);
2547 if (r < 0)
2548 return r;
2549
2550 if (s->exec_fd_event_source) {
2551 r = serialize_fd(f, fds, "exec-fd", sd_event_source_get_io_fd(s->exec_fd_event_source));
2552 if (r < 0)
2553 return r;
2554
2555 (void) serialize_bool(f, "exec-fd-hot", s->exec_fd_hot);
2556 }
2557
2558 if (UNIT_ISSET(s->accept_socket)) {
2559 r = serialize_item(f, "accept-socket", UNIT_DEREF(s->accept_socket)->id);
2560 if (r < 0)
2561 return r;
2562 }
2563
2564 r = serialize_fd(f, fds, "socket-fd", s->socket_fd);
2565 if (r < 0)
2566 return r;
2567
2568 LIST_FOREACH(fd_store, fs, s->fd_store) {
2569 _cleanup_free_ char *c = NULL;
2570 int copy;
2571
2572 copy = fdset_put_dup(fds, fs->fd);
2573 if (copy < 0)
2574 return log_error_errno(copy, "Failed to copy file descriptor for serialization: %m");
2575
2576 c = cescape(fs->fdname);
2577 if (!c)
2578 return log_oom();
2579
2580 (void) serialize_item_format(f, "fd-store-fd", "%i %s", copy, c);
2581 }
2582
2583 if (s->main_exec_status.pid > 0) {
2584 (void) serialize_item_format(f, "main-exec-status-pid", PID_FMT, s->main_exec_status.pid);
2585 (void) serialize_dual_timestamp(f, "main-exec-status-start", &s->main_exec_status.start_timestamp);
2586 (void) serialize_dual_timestamp(f, "main-exec-status-exit", &s->main_exec_status.exit_timestamp);
2587
2588 if (dual_timestamp_is_set(&s->main_exec_status.exit_timestamp)) {
2589 (void) serialize_item_format(f, "main-exec-status-code", "%i", s->main_exec_status.code);
2590 (void) serialize_item_format(f, "main-exec-status-status", "%i", s->main_exec_status.status);
2591 }
2592 }
2593
2594 (void) serialize_dual_timestamp(f, "watchdog-timestamp", &s->watchdog_timestamp);
2595 (void) serialize_bool(f, "forbid-restart", s->forbid_restart);
2596
2597 if (s->watchdog_override_enable)
2598 (void) serialize_item_format(f, "watchdog-override-usec", USEC_FMT, s->watchdog_override_usec);
2599
2600 if (s->watchdog_original_usec != USEC_INFINITY)
2601 (void) serialize_item_format(f, "watchdog-original-usec", USEC_FMT, s->watchdog_original_usec);
2602
2603 return 0;
2604 }
2605
2606 static int service_deserialize_exec_command(Unit *u, const char *key, const char *value) {
2607 Service *s = SERVICE(u);
2608 int r;
2609 unsigned idx = 0, i;
2610 bool control, found = false;
2611 ServiceExecCommand id = _SERVICE_EXEC_COMMAND_INVALID;
2612 ExecCommand *command = NULL;
2613 _cleanup_free_ char *path = NULL;
2614 _cleanup_strv_free_ char **argv = NULL;
2615
2616 enum ExecCommandState {
2617 STATE_EXEC_COMMAND_TYPE,
2618 STATE_EXEC_COMMAND_INDEX,
2619 STATE_EXEC_COMMAND_PATH,
2620 STATE_EXEC_COMMAND_ARGS,
2621 _STATE_EXEC_COMMAND_MAX,
2622 _STATE_EXEC_COMMAND_INVALID = -1,
2623 } state;
2624
2625 assert(s);
2626 assert(key);
2627 assert(value);
2628
2629 control = streq(key, "control-command");
2630
2631 state = STATE_EXEC_COMMAND_TYPE;
2632
2633 for (;;) {
2634 _cleanup_free_ char *arg = NULL;
2635
2636 r = extract_first_word(&value, &arg, NULL, EXTRACT_CUNESCAPE);
2637 if (r < 0)
2638 return r;
2639 if (r == 0)
2640 break;
2641
2642 switch (state) {
2643 case STATE_EXEC_COMMAND_TYPE:
2644 id = service_exec_command_from_string(arg);
2645 if (id < 0)
2646 return -EINVAL;
2647
2648 state = STATE_EXEC_COMMAND_INDEX;
2649 break;
2650 case STATE_EXEC_COMMAND_INDEX:
2651 r = safe_atou(arg, &idx);
2652 if (r < 0)
2653 return -EINVAL;
2654
2655 state = STATE_EXEC_COMMAND_PATH;
2656 break;
2657 case STATE_EXEC_COMMAND_PATH:
2658 path = TAKE_PTR(arg);
2659 state = STATE_EXEC_COMMAND_ARGS;
2660
2661 if (!path_is_absolute(path))
2662 return -EINVAL;
2663 break;
2664 case STATE_EXEC_COMMAND_ARGS:
2665 r = strv_extend(&argv, arg);
2666 if (r < 0)
2667 return -ENOMEM;
2668 break;
2669 default:
2670 assert_not_reached("Unknown error at deserialization of exec command");
2671 break;
2672 }
2673 }
2674
2675 if (state != STATE_EXEC_COMMAND_ARGS)
2676 return -EINVAL;
2677
2678 /* Let's check whether exec command on given offset matches data that we just deserialized */
2679 for (command = s->exec_command[id], i = 0; command; command = command->command_next, i++) {
2680 if (i != idx)
2681 continue;
2682
2683 found = strv_equal(argv, command->argv) && streq(command->path, path);
2684 break;
2685 }
2686
2687 if (!found) {
2688 /* Command at the index we serialized is different, let's look for command that exactly
2689 * matches but is on different index. If there is no such command we will not resume execution. */
2690 for (command = s->exec_command[id]; command; command = command->command_next)
2691 if (strv_equal(command->argv, argv) && streq(command->path, path))
2692 break;
2693 }
2694
2695 if (command && control)
2696 s->control_command = command;
2697 else if (command)
2698 s->main_command = command;
2699 else
2700 log_unit_warning(u, "Current command vanished from the unit file, execution of the command list won't be resumed.");
2701
2702 return 0;
2703 }
2704
2705 static int service_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
2706 Service *s = SERVICE(u);
2707 int r;
2708
2709 assert(u);
2710 assert(key);
2711 assert(value);
2712 assert(fds);
2713
2714 if (streq(key, "state")) {
2715 ServiceState state;
2716
2717 state = service_state_from_string(value);
2718 if (state < 0)
2719 log_unit_debug(u, "Failed to parse state value: %s", value);
2720 else
2721 s->deserialized_state = state;
2722 } else if (streq(key, "result")) {
2723 ServiceResult f;
2724
2725 f = service_result_from_string(value);
2726 if (f < 0)
2727 log_unit_debug(u, "Failed to parse result value: %s", value);
2728 else if (f != SERVICE_SUCCESS)
2729 s->result = f;
2730
2731 } else if (streq(key, "reload-result")) {
2732 ServiceResult f;
2733
2734 f = service_result_from_string(value);
2735 if (f < 0)
2736 log_unit_debug(u, "Failed to parse reload result value: %s", value);
2737 else if (f != SERVICE_SUCCESS)
2738 s->reload_result = f;
2739
2740 } else if (streq(key, "control-pid")) {
2741 pid_t pid;
2742
2743 if (parse_pid(value, &pid) < 0)
2744 log_unit_debug(u, "Failed to parse control-pid value: %s", value);
2745 else
2746 s->control_pid = pid;
2747 } else if (streq(key, "main-pid")) {
2748 pid_t pid;
2749
2750 if (parse_pid(value, &pid) < 0)
2751 log_unit_debug(u, "Failed to parse main-pid value: %s", value);
2752 else
2753 (void) service_set_main_pid(s, pid);
2754 } else if (streq(key, "main-pid-known")) {
2755 int b;
2756
2757 b = parse_boolean(value);
2758 if (b < 0)
2759 log_unit_debug(u, "Failed to parse main-pid-known value: %s", value);
2760 else
2761 s->main_pid_known = b;
2762 } else if (streq(key, "bus-name-good")) {
2763 int b;
2764
2765 b = parse_boolean(value);
2766 if (b < 0)
2767 log_unit_debug(u, "Failed to parse bus-name-good value: %s", value);
2768 else
2769 s->bus_name_good = b;
2770 } else if (streq(key, "bus-name-owner")) {
2771 r = free_and_strdup(&s->bus_name_owner, value);
2772 if (r < 0)
2773 log_unit_error_errno(u, r, "Unable to deserialize current bus owner %s: %m", value);
2774 } else if (streq(key, "status-text")) {
2775 char *t;
2776
2777 r = cunescape(value, 0, &t);
2778 if (r < 0)
2779 log_unit_debug_errno(u, r, "Failed to unescape status text '%s': %m", value);
2780 else
2781 free_and_replace(s->status_text, t);
2782
2783 } else if (streq(key, "accept-socket")) {
2784 Unit *socket;
2785
2786 r = manager_load_unit(u->manager, value, NULL, NULL, &socket);
2787 if (r < 0)
2788 log_unit_debug_errno(u, r, "Failed to load accept-socket unit '%s': %m", value);
2789 else {
2790 unit_ref_set(&s->accept_socket, u, socket);
2791 SOCKET(socket)->n_connections++;
2792 }
2793
2794 } else if (streq(key, "socket-fd")) {
2795 int fd;
2796
2797 if (safe_atoi(value, &fd) < 0 || fd < 0 || !fdset_contains(fds, fd))
2798 log_unit_debug(u, "Failed to parse socket-fd value: %s", value);
2799 else {
2800 asynchronous_close(s->socket_fd);
2801 s->socket_fd = fdset_remove(fds, fd);
2802 }
2803 } else if (streq(key, "fd-store-fd")) {
2804 const char *fdv;
2805 size_t pf;
2806 int fd;
2807
2808 pf = strcspn(value, WHITESPACE);
2809 fdv = strndupa(value, pf);
2810
2811 if (safe_atoi(fdv, &fd) < 0 || fd < 0 || !fdset_contains(fds, fd))
2812 log_unit_debug(u, "Failed to parse fd-store-fd value: %s", value);
2813 else {
2814 _cleanup_free_ char *t = NULL;
2815 const char *fdn;
2816
2817 fdn = value + pf;
2818 fdn += strspn(fdn, WHITESPACE);
2819 (void) cunescape(fdn, 0, &t);
2820
2821 r = service_add_fd_store(s, fd, t);
2822 if (r < 0)
2823 log_unit_error_errno(u, r, "Failed to add fd to store: %m");
2824 else
2825 fdset_remove(fds, fd);
2826 }
2827
2828 } else if (streq(key, "main-exec-status-pid")) {
2829 pid_t pid;
2830
2831 if (parse_pid(value, &pid) < 0)
2832 log_unit_debug(u, "Failed to parse main-exec-status-pid value: %s", value);
2833 else
2834 s->main_exec_status.pid = pid;
2835 } else if (streq(key, "main-exec-status-code")) {
2836 int i;
2837
2838 if (safe_atoi(value, &i) < 0)
2839 log_unit_debug(u, "Failed to parse main-exec-status-code value: %s", value);
2840 else
2841 s->main_exec_status.code = i;
2842 } else if (streq(key, "main-exec-status-status")) {
2843 int i;
2844
2845 if (safe_atoi(value, &i) < 0)
2846 log_unit_debug(u, "Failed to parse main-exec-status-status value: %s", value);
2847 else
2848 s->main_exec_status.status = i;
2849 } else if (streq(key, "main-exec-status-start"))
2850 deserialize_dual_timestamp(value, &s->main_exec_status.start_timestamp);
2851 else if (streq(key, "main-exec-status-exit"))
2852 deserialize_dual_timestamp(value, &s->main_exec_status.exit_timestamp);
2853 else if (streq(key, "watchdog-timestamp"))
2854 deserialize_dual_timestamp(value, &s->watchdog_timestamp);
2855 else if (streq(key, "forbid-restart")) {
2856 int b;
2857
2858 b = parse_boolean(value);
2859 if (b < 0)
2860 log_unit_debug(u, "Failed to parse forbid-restart value: %s", value);
2861 else
2862 s->forbid_restart = b;
2863 } else if (streq(key, "stdin-fd")) {
2864 int fd;
2865
2866 if (safe_atoi(value, &fd) < 0 || fd < 0 || !fdset_contains(fds, fd))
2867 log_unit_debug(u, "Failed to parse stdin-fd value: %s", value);
2868 else {
2869 asynchronous_close(s->stdin_fd);
2870 s->stdin_fd = fdset_remove(fds, fd);
2871 s->exec_context.stdio_as_fds = true;
2872 }
2873 } else if (streq(key, "stdout-fd")) {
2874 int fd;
2875
2876 if (safe_atoi(value, &fd) < 0 || fd < 0 || !fdset_contains(fds, fd))
2877 log_unit_debug(u, "Failed to parse stdout-fd value: %s", value);
2878 else {
2879 asynchronous_close(s->stdout_fd);
2880 s->stdout_fd = fdset_remove(fds, fd);
2881 s->exec_context.stdio_as_fds = true;
2882 }
2883 } else if (streq(key, "stderr-fd")) {
2884 int fd;
2885
2886 if (safe_atoi(value, &fd) < 0 || fd < 0 || !fdset_contains(fds, fd))
2887 log_unit_debug(u, "Failed to parse stderr-fd value: %s", value);
2888 else {
2889 asynchronous_close(s->stderr_fd);
2890 s->stderr_fd = fdset_remove(fds, fd);
2891 s->exec_context.stdio_as_fds = true;
2892 }
2893 } else if (streq(key, "exec-fd")) {
2894 int fd;
2895
2896 if (safe_atoi(value, &fd) < 0 || fd < 0 || !fdset_contains(fds, fd))
2897 log_unit_debug(u, "Failed to parse exec-fd value: %s", value);
2898 else {
2899 s->exec_fd_event_source = sd_event_source_unref(s->exec_fd_event_source);
2900
2901 fd = fdset_remove(fds, fd);
2902 if (service_allocate_exec_fd_event_source(s, fd, &s->exec_fd_event_source) < 0)
2903 safe_close(fd);
2904 }
2905 } else if (streq(key, "watchdog-override-usec")) {
2906 if (deserialize_usec(value, &s->watchdog_override_usec) < 0)
2907 log_unit_debug(u, "Failed to parse watchdog_override_usec value: %s", value);
2908 else
2909 s->watchdog_override_enable = true;
2910
2911 } else if (streq(key, "watchdog-original-usec")) {
2912 if (deserialize_usec(value, &s->watchdog_original_usec) < 0)
2913 log_unit_debug(u, "Failed to parse watchdog_original_usec value: %s", value);
2914
2915 } else if (STR_IN_SET(key, "main-command", "control-command")) {
2916 r = service_deserialize_exec_command(u, key, value);
2917 if (r < 0)
2918 log_unit_debug_errno(u, r, "Failed to parse serialized command \"%s\": %m", value);
2919
2920 } else if (streq(key, "n-restarts")) {
2921 r = safe_atou(value, &s->n_restarts);
2922 if (r < 0)
2923 log_unit_debug_errno(u, r, "Failed to parse serialized restart counter '%s': %m", value);
2924
2925 } else if (streq(key, "flush-n-restarts")) {
2926 r = parse_boolean(value);
2927 if (r < 0)
2928 log_unit_debug_errno(u, r, "Failed to parse serialized flush restart counter setting '%s': %m", value);
2929 else
2930 s->flush_n_restarts = r;
2931 } else
2932 log_unit_debug(u, "Unknown serialization key: %s", key);
2933
2934 return 0;
2935 }
2936
2937 _pure_ static UnitActiveState service_active_state(Unit *u) {
2938 const UnitActiveState *table;
2939
2940 assert(u);
2941
2942 table = SERVICE(u)->type == SERVICE_IDLE ? state_translation_table_idle : state_translation_table;
2943
2944 return table[SERVICE(u)->state];
2945 }
2946
2947 static const char *service_sub_state_to_string(Unit *u) {
2948 assert(u);
2949
2950 return service_state_to_string(SERVICE(u)->state);
2951 }
2952
2953 static bool service_may_gc(Unit *u) {
2954 Service *s = SERVICE(u);
2955
2956 assert(s);
2957
2958 /* Never clean up services that still have a process around, even if the service is formally dead. Note that
2959 * unit_may_gc() already checked our cgroup for us, we just check our two additional PIDs, too, in case they
2960 * have moved outside of the cgroup. */
2961
2962 if (main_pid_good(s) > 0 ||
2963 control_pid_good(s) > 0)
2964 return false;
2965
2966 return true;
2967 }
2968
2969 static int service_retry_pid_file(Service *s) {
2970 int r;
2971
2972 assert(s->pid_file);
2973 assert(IN_SET(s->state, SERVICE_START, SERVICE_START_POST));
2974
2975 r = service_load_pid_file(s, false);
2976 if (r < 0)
2977 return r;
2978
2979 service_unwatch_pid_file(s);
2980
2981 service_enter_running(s, SERVICE_SUCCESS);
2982 return 0;
2983 }
2984
2985 static int service_watch_pid_file(Service *s) {
2986 int r;
2987
2988 log_unit_debug(UNIT(s), "Setting watch for PID file %s", s->pid_file_pathspec->path);
2989
2990 r = path_spec_watch(s->pid_file_pathspec, service_dispatch_inotify_io);
2991 if (r < 0)
2992 goto fail;
2993
2994 /* the pidfile might have appeared just before we set the watch */
2995 log_unit_debug(UNIT(s), "Trying to read PID file %s in case it changed", s->pid_file_pathspec->path);
2996 service_retry_pid_file(s);
2997
2998 return 0;
2999 fail:
3000 log_unit_error_errno(UNIT(s), r, "Failed to set a watch for PID file %s: %m", s->pid_file_pathspec->path);
3001 service_unwatch_pid_file(s);
3002 return r;
3003 }
3004
3005 static int service_demand_pid_file(Service *s) {
3006 PathSpec *ps;
3007
3008 assert(s->pid_file);
3009 assert(!s->pid_file_pathspec);
3010
3011 ps = new0(PathSpec, 1);
3012 if (!ps)
3013 return -ENOMEM;
3014
3015 ps->unit = UNIT(s);
3016 ps->path = strdup(s->pid_file);
3017 if (!ps->path) {
3018 free(ps);
3019 return -ENOMEM;
3020 }
3021
3022 path_simplify(ps->path, false);
3023
3024 /* PATH_CHANGED would not be enough. There are daemons (sendmail) that
3025 * keep their PID file open all the time. */
3026 ps->type = PATH_MODIFIED;
3027 ps->inotify_fd = -1;
3028
3029 s->pid_file_pathspec = ps;
3030
3031 return service_watch_pid_file(s);
3032 }
3033
3034 static int service_dispatch_inotify_io(sd_event_source *source, int fd, uint32_t events, void *userdata) {
3035 PathSpec *p = userdata;
3036 Service *s;
3037
3038 assert(p);
3039
3040 s = SERVICE(p->unit);
3041
3042 assert(s);
3043 assert(fd >= 0);
3044 assert(IN_SET(s->state, SERVICE_START, SERVICE_START_POST));
3045 assert(s->pid_file_pathspec);
3046 assert(path_spec_owns_inotify_fd(s->pid_file_pathspec, fd));
3047
3048 log_unit_debug(UNIT(s), "inotify event");
3049
3050 if (path_spec_fd_event(p, events) < 0)
3051 goto fail;
3052
3053 if (service_retry_pid_file(s) == 0)
3054 return 0;
3055
3056 if (service_watch_pid_file(s) < 0)
3057 goto fail;
3058
3059 return 0;
3060
3061 fail:
3062 service_unwatch_pid_file(s);
3063 service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_FAILURE_RESOURCES);
3064 return 0;
3065 }
3066
3067 static int service_dispatch_exec_io(sd_event_source *source, int fd, uint32_t events, void *userdata) {
3068 Service *s = SERVICE(userdata);
3069
3070 assert(s);
3071
3072 log_unit_debug(UNIT(s), "got exec-fd event");
3073
3074 /* If Type=exec is set, we'll consider a service started successfully the instant we invoked execve()
3075 * successfully for it. We implement this through a pipe() towards the child, which the kernel automatically
3076 * closes for us due to O_CLOEXEC on execve() in the child, which then triggers EOF on the pipe in the
3077 * parent. We need to be careful however, as there are other reasons that we might cause the child's side of
3078 * the pipe to be closed (for example, a simple exit()). To deal with that we'll ignore EOFs on the pipe unless
3079 * the child signalled us first that it is about to call the execve(). It does so by sending us a simple
3080 * non-zero byte via the pipe. We also provide the child with a way to inform us in case execve() failed: if it
3081 * sends a zero byte we'll ignore POLLHUP on the fd again. */
3082
3083 for (;;) {
3084 uint8_t x;
3085 ssize_t n;
3086
3087 n = read(fd, &x, sizeof(x));
3088 if (n < 0) {
3089 if (errno == EAGAIN) /* O_NONBLOCK in effect → everything queued has now been processed. */
3090 return 0;
3091
3092 return log_unit_error_errno(UNIT(s), errno, "Failed to read from exec_fd: %m");
3093 }
3094 if (n == 0) { /* EOF → the event we are waiting for */
3095
3096 s->exec_fd_event_source = sd_event_source_unref(s->exec_fd_event_source);
3097
3098 if (s->exec_fd_hot) { /* Did the child tell us to expect EOF now? */
3099 log_unit_debug(UNIT(s), "Got EOF on exec-fd");
3100
3101 s->exec_fd_hot = false;
3102
3103 /* Nice! This is what we have been waiting for. Transition to next state. */
3104 if (s->type == SERVICE_EXEC && s->state == SERVICE_START)
3105 service_enter_start_post(s);
3106 } else
3107 log_unit_debug(UNIT(s), "Got EOF on exec-fd while it was disabled, ignoring.");
3108
3109 return 0;
3110 }
3111
3112 /* A byte was read → this turns on/off the exec fd logic */
3113 assert(n == sizeof(x));
3114 s->exec_fd_hot = x;
3115 }
3116
3117 return 0;
3118 }
3119
3120 static void service_notify_cgroup_empty_event(Unit *u) {
3121 Service *s = SERVICE(u);
3122
3123 assert(u);
3124
3125 log_unit_debug(u, "cgroup is empty");
3126
3127 switch (s->state) {
3128
3129 /* Waiting for SIGCHLD is usually more interesting,
3130 * because it includes return codes/signals. Which is
3131 * why we ignore the cgroup events for most cases,
3132 * except when we don't know pid which to expect the
3133 * SIGCHLD for. */
3134
3135 case SERVICE_START:
3136 if (s->type == SERVICE_NOTIFY &&
3137 main_pid_good(s) == 0 &&
3138 control_pid_good(s) == 0) {
3139 /* No chance of getting a ready notification anymore */
3140 service_enter_stop_post(s, SERVICE_FAILURE_PROTOCOL);
3141 break;
3142 }
3143
3144 _fallthrough_;
3145 case SERVICE_START_POST:
3146 if (s->pid_file_pathspec &&
3147 main_pid_good(s) == 0 &&
3148 control_pid_good(s) == 0) {
3149
3150 /* Give up hoping for the daemon to write its PID file */
3151 log_unit_warning(u, "Daemon never wrote its PID file. Failing.");
3152
3153 service_unwatch_pid_file(s);
3154 if (s->state == SERVICE_START)
3155 service_enter_stop_post(s, SERVICE_FAILURE_PROTOCOL);
3156 else
3157 service_enter_stop(s, SERVICE_FAILURE_PROTOCOL);
3158 }
3159 break;
3160
3161 case SERVICE_RUNNING:
3162 /* service_enter_running() will figure out what to do */
3163 service_enter_running(s, SERVICE_SUCCESS);
3164 break;
3165
3166 case SERVICE_STOP_WATCHDOG:
3167 case SERVICE_STOP_SIGTERM:
3168 case SERVICE_STOP_SIGKILL:
3169
3170 if (main_pid_good(s) <= 0 && control_pid_good(s) <= 0)
3171 service_enter_stop_post(s, SERVICE_SUCCESS);
3172
3173 break;
3174
3175 case SERVICE_STOP_POST:
3176 case SERVICE_FINAL_SIGTERM:
3177 case SERVICE_FINAL_SIGKILL:
3178 if (main_pid_good(s) <= 0 && control_pid_good(s) <= 0)
3179 service_enter_dead(s, SERVICE_SUCCESS, true);
3180
3181 break;
3182
3183 default:
3184 ;
3185 }
3186 }
3187
3188 static void service_sigchld_event(Unit *u, pid_t pid, int code, int status) {
3189 bool notify_dbus = true;
3190 Service *s = SERVICE(u);
3191 ServiceResult f;
3192
3193 assert(s);
3194 assert(pid >= 0);
3195
3196 if (is_clean_exit(code, status, s->type == SERVICE_ONESHOT ? EXIT_CLEAN_COMMAND : EXIT_CLEAN_DAEMON, &s->success_status))
3197 f = SERVICE_SUCCESS;
3198 else if (code == CLD_EXITED)
3199 f = SERVICE_FAILURE_EXIT_CODE;
3200 else if (code == CLD_KILLED)
3201 f = SERVICE_FAILURE_SIGNAL;
3202 else if (code == CLD_DUMPED)
3203 f = SERVICE_FAILURE_CORE_DUMP;
3204 else
3205 assert_not_reached("Unknown code");
3206
3207 if (s->main_pid == pid) {
3208 /* Forking services may occasionally move to a new PID.
3209 * As long as they update the PID file before exiting the old
3210 * PID, they're fine. */
3211 if (service_load_pid_file(s, false) > 0)
3212 return;
3213
3214 s->main_pid = 0;
3215 exec_status_exit(&s->main_exec_status, &s->exec_context, pid, code, status);
3216
3217 if (s->main_command) {
3218 /* If this is not a forking service than the
3219 * main process got started and hence we copy
3220 * the exit status so that it is recorded both
3221 * as main and as control process exit
3222 * status */
3223
3224 s->main_command->exec_status = s->main_exec_status;
3225
3226 if (s->main_command->flags & EXEC_COMMAND_IGNORE_FAILURE)
3227 f = SERVICE_SUCCESS;
3228 } else if (s->exec_command[SERVICE_EXEC_START]) {
3229
3230 /* If this is a forked process, then we should
3231 * ignore the return value if this was
3232 * configured for the starter process */
3233
3234 if (s->exec_command[SERVICE_EXEC_START]->flags & EXEC_COMMAND_IGNORE_FAILURE)
3235 f = SERVICE_SUCCESS;
3236 }
3237
3238 /* When this is a successful exit, let's log about the exit code on DEBUG level. If this is a failure
3239 * and the process exited on its own via exit(), then let's make this a NOTICE, under the assumption
3240 * that the service already logged the reason at a higher log level on its own. (Internally,
3241 * unit_log_process_exit() will possibly bump this to WARNING if the service died due to a signal.) */
3242 unit_log_process_exit(
3243 u, f == SERVICE_SUCCESS ? LOG_DEBUG : LOG_NOTICE,
3244 "Main process",
3245 service_exec_command_to_string(SERVICE_EXEC_START),
3246 code, status);
3247
3248 if (s->result == SERVICE_SUCCESS)
3249 s->result = f;
3250
3251 if (s->main_command &&
3252 s->main_command->command_next &&
3253 s->type == SERVICE_ONESHOT &&
3254 f == SERVICE_SUCCESS) {
3255
3256 /* There is another command to *
3257 * execute, so let's do that. */
3258
3259 log_unit_debug(u, "Running next main command for state %s.", service_state_to_string(s->state));
3260 service_run_next_main(s);
3261
3262 } else {
3263
3264 /* The service exited, so the service is officially
3265 * gone. */
3266 s->main_command = NULL;
3267
3268 switch (s->state) {
3269
3270 case SERVICE_START_POST:
3271 case SERVICE_RELOAD:
3272 case SERVICE_STOP:
3273 /* Need to wait until the operation is
3274 * done */
3275 break;
3276
3277 case SERVICE_START:
3278 if (s->type == SERVICE_ONESHOT) {
3279 /* This was our main goal, so let's go on */
3280 if (f == SERVICE_SUCCESS)
3281 service_enter_start_post(s);
3282 else
3283 service_enter_signal(s, SERVICE_STOP_SIGTERM, f);
3284 break;
3285 } else if (s->type == SERVICE_NOTIFY) {
3286 /* Only enter running through a notification, so that the
3287 * SERVICE_START state signifies that no ready notification
3288 * has been received */
3289 if (f != SERVICE_SUCCESS)
3290 service_enter_signal(s, SERVICE_STOP_SIGTERM, f);
3291 else if (!s->remain_after_exit || s->notify_access == NOTIFY_MAIN)
3292 /* The service has never been and will never be active */
3293 service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_FAILURE_PROTOCOL);
3294 break;
3295 }
3296
3297 _fallthrough_;
3298 case SERVICE_RUNNING:
3299 service_enter_running(s, f);
3300 break;
3301
3302 case SERVICE_STOP_WATCHDOG:
3303 case SERVICE_STOP_SIGTERM:
3304 case SERVICE_STOP_SIGKILL:
3305
3306 if (control_pid_good(s) <= 0)
3307 service_enter_stop_post(s, f);
3308
3309 /* If there is still a control process, wait for that first */
3310 break;
3311
3312 case SERVICE_STOP_POST:
3313 case SERVICE_FINAL_SIGTERM:
3314 case SERVICE_FINAL_SIGKILL:
3315
3316 if (control_pid_good(s) <= 0)
3317 service_enter_dead(s, f, true);
3318 break;
3319
3320 default:
3321 assert_not_reached("Uh, main process died at wrong time.");
3322 }
3323 }
3324
3325 } else if (s->control_pid == pid) {
3326 s->control_pid = 0;
3327
3328 if (s->control_command) {
3329 exec_status_exit(&s->control_command->exec_status, &s->exec_context, pid, code, status);
3330
3331 if (s->control_command->flags & EXEC_COMMAND_IGNORE_FAILURE)
3332 f = SERVICE_SUCCESS;
3333 }
3334
3335 unit_log_process_exit(
3336 u, f == SERVICE_SUCCESS ? LOG_DEBUG : LOG_NOTICE,
3337 "Control process",
3338 service_exec_command_to_string(s->control_command_id),
3339 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 int service_exit_status(Unit *u) {
4014 Service *s = SERVICE(u);
4015
4016 assert(u);
4017
4018 if (s->main_exec_status.pid <= 0 ||
4019 !dual_timestamp_is_set(&s->main_exec_status.exit_timestamp))
4020 return -ENODATA;
4021
4022 if (s->main_exec_status.code != CLD_EXITED)
4023 return -EBADE;
4024
4025 return s->main_exec_status.status;
4026 }
4027
4028 static const char* const service_restart_table[_SERVICE_RESTART_MAX] = {
4029 [SERVICE_RESTART_NO] = "no",
4030 [SERVICE_RESTART_ON_SUCCESS] = "on-success",
4031 [SERVICE_RESTART_ON_FAILURE] = "on-failure",
4032 [SERVICE_RESTART_ON_ABNORMAL] = "on-abnormal",
4033 [SERVICE_RESTART_ON_WATCHDOG] = "on-watchdog",
4034 [SERVICE_RESTART_ON_ABORT] = "on-abort",
4035 [SERVICE_RESTART_ALWAYS] = "always",
4036 };
4037
4038 DEFINE_STRING_TABLE_LOOKUP(service_restart, ServiceRestart);
4039
4040 static const char* const service_type_table[_SERVICE_TYPE_MAX] = {
4041 [SERVICE_SIMPLE] = "simple",
4042 [SERVICE_FORKING] = "forking",
4043 [SERVICE_ONESHOT] = "oneshot",
4044 [SERVICE_DBUS] = "dbus",
4045 [SERVICE_NOTIFY] = "notify",
4046 [SERVICE_IDLE] = "idle",
4047 [SERVICE_EXEC] = "exec",
4048 };
4049
4050 DEFINE_STRING_TABLE_LOOKUP(service_type, ServiceType);
4051
4052 static const char* const service_exec_command_table[_SERVICE_EXEC_COMMAND_MAX] = {
4053 [SERVICE_EXEC_START_PRE] = "ExecStartPre",
4054 [SERVICE_EXEC_START] = "ExecStart",
4055 [SERVICE_EXEC_START_POST] = "ExecStartPost",
4056 [SERVICE_EXEC_RELOAD] = "ExecReload",
4057 [SERVICE_EXEC_STOP] = "ExecStop",
4058 [SERVICE_EXEC_STOP_POST] = "ExecStopPost",
4059 };
4060
4061 DEFINE_STRING_TABLE_LOOKUP(service_exec_command, ServiceExecCommand);
4062
4063 static const char* const notify_state_table[_NOTIFY_STATE_MAX] = {
4064 [NOTIFY_UNKNOWN] = "unknown",
4065 [NOTIFY_READY] = "ready",
4066 [NOTIFY_RELOADING] = "reloading",
4067 [NOTIFY_STOPPING] = "stopping",
4068 };
4069
4070 DEFINE_STRING_TABLE_LOOKUP(notify_state, NotifyState);
4071
4072 static const char* const service_result_table[_SERVICE_RESULT_MAX] = {
4073 [SERVICE_SUCCESS] = "success",
4074 [SERVICE_FAILURE_RESOURCES] = "resources",
4075 [SERVICE_FAILURE_PROTOCOL] = "protocol",
4076 [SERVICE_FAILURE_TIMEOUT] = "timeout",
4077 [SERVICE_FAILURE_EXIT_CODE] = "exit-code",
4078 [SERVICE_FAILURE_SIGNAL] = "signal",
4079 [SERVICE_FAILURE_CORE_DUMP] = "core-dump",
4080 [SERVICE_FAILURE_WATCHDOG] = "watchdog",
4081 [SERVICE_FAILURE_START_LIMIT_HIT] = "start-limit-hit",
4082 };
4083
4084 DEFINE_STRING_TABLE_LOOKUP(service_result, ServiceResult);
4085
4086 const UnitVTable service_vtable = {
4087 .object_size = sizeof(Service),
4088 .exec_context_offset = offsetof(Service, exec_context),
4089 .cgroup_context_offset = offsetof(Service, cgroup_context),
4090 .kill_context_offset = offsetof(Service, kill_context),
4091 .exec_runtime_offset = offsetof(Service, exec_runtime),
4092 .dynamic_creds_offset = offsetof(Service, dynamic_creds),
4093
4094 .sections =
4095 "Unit\0"
4096 "Service\0"
4097 "Install\0",
4098 .private_section = "Service",
4099
4100 .can_transient = true,
4101 .can_delegate = true,
4102
4103 .init = service_init,
4104 .done = service_done,
4105 .load = service_load,
4106 .release_resources = service_release_resources,
4107
4108 .coldplug = service_coldplug,
4109
4110 .dump = service_dump,
4111
4112 .start = service_start,
4113 .stop = service_stop,
4114 .reload = service_reload,
4115
4116 .can_reload = service_can_reload,
4117
4118 .kill = service_kill,
4119
4120 .serialize = service_serialize,
4121 .deserialize_item = service_deserialize_item,
4122
4123 .active_state = service_active_state,
4124 .sub_state_to_string = service_sub_state_to_string,
4125
4126 .will_restart = service_will_restart,
4127
4128 .may_gc = service_may_gc,
4129
4130 .sigchld_event = service_sigchld_event,
4131
4132 .reset_failed = service_reset_failed,
4133
4134 .notify_cgroup_empty = service_notify_cgroup_empty_event,
4135 .notify_message = service_notify_message,
4136
4137 .main_pid = service_main_pid,
4138 .control_pid = service_control_pid,
4139
4140 .bus_name_owner_change = service_bus_name_owner_change,
4141
4142 .bus_vtable = bus_service_vtable,
4143 .bus_set_property = bus_service_set_property,
4144 .bus_commit_properties = bus_service_commit_properties,
4145
4146 .get_timeout = service_get_timeout,
4147 .needs_console = service_needs_console,
4148 .exit_status = service_exit_status,
4149
4150 .status_message_formats = {
4151 .starting_stopping = {
4152 [0] = "Starting %s...",
4153 [1] = "Stopping %s...",
4154 },
4155 .finished_start_job = {
4156 [JOB_DONE] = "Started %s.",
4157 [JOB_FAILED] = "Failed to start %s.",
4158 },
4159 .finished_stop_job = {
4160 [JOB_DONE] = "Stopped %s.",
4161 [JOB_FAILED] = "Stopped (with error) %s.",
4162 },
4163 },
4164 };
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