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[thirdparty/systemd.git] / src / core / service.c
1 /* SPDX-License-Identifier: LGPL-2.1+ */
2
3 #include <errno.h>
4 #include <signal.h>
5 #include <unistd.h>
6
7 #include "sd-messages.h"
8
9 #include "alloc-util.h"
10 #include "async.h"
11 #include "bus-error.h"
12 #include "bus-kernel.h"
13 #include "bus-util.h"
14 #include "dbus-service.h"
15 #include "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 assert(s);
147
148 if (pid <= 1)
149 return -EINVAL;
150
151 if (pid == getpid_cached())
152 return -EINVAL;
153
154 if (s->main_pid == pid && s->main_pid_known)
155 return 0;
156
157 if (s->main_pid != pid) {
158 service_unwatch_main_pid(s);
159 exec_status_start(&s->main_exec_status, pid);
160 }
161
162 s->main_pid = pid;
163 s->main_pid_known = true;
164 s->main_pid_alien = pid_is_my_child(pid) == 0;
165
166 if (s->main_pid_alien)
167 log_unit_warning(UNIT(s), "Supervising process "PID_FMT" which is not our child. We'll most likely not notice when it exits.", pid);
168
169 return 0;
170 }
171
172 void service_close_socket_fd(Service *s) {
173 assert(s);
174
175 /* Undo the effect of service_set_socket_fd(). */
176
177 s->socket_fd = asynchronous_close(s->socket_fd);
178
179 if (UNIT_ISSET(s->accept_socket)) {
180 socket_connection_unref(SOCKET(UNIT_DEREF(s->accept_socket)));
181 unit_ref_unset(&s->accept_socket);
182 }
183 }
184
185 static void service_stop_watchdog(Service *s) {
186 assert(s);
187
188 s->watchdog_event_source = sd_event_source_unref(s->watchdog_event_source);
189 s->watchdog_timestamp = DUAL_TIMESTAMP_NULL;
190 }
191
192 static usec_t service_get_watchdog_usec(Service *s) {
193 assert(s);
194
195 if (s->watchdog_override_enable)
196 return s->watchdog_override_usec;
197
198 return s->watchdog_original_usec;
199 }
200
201 static void service_start_watchdog(Service *s) {
202 usec_t watchdog_usec;
203 int r;
204
205 assert(s);
206
207 watchdog_usec = service_get_watchdog_usec(s);
208 if (IN_SET(watchdog_usec, 0, USEC_INFINITY)) {
209 service_stop_watchdog(s);
210 return;
211 }
212
213 if (s->watchdog_event_source) {
214 r = sd_event_source_set_time(s->watchdog_event_source, usec_add(s->watchdog_timestamp.monotonic, watchdog_usec));
215 if (r < 0) {
216 log_unit_warning_errno(UNIT(s), r, "Failed to reset watchdog timer: %m");
217 return;
218 }
219
220 r = sd_event_source_set_enabled(s->watchdog_event_source, SD_EVENT_ONESHOT);
221 } else {
222 r = sd_event_add_time(
223 UNIT(s)->manager->event,
224 &s->watchdog_event_source,
225 CLOCK_MONOTONIC,
226 usec_add(s->watchdog_timestamp.monotonic, watchdog_usec), 0,
227 service_dispatch_watchdog, s);
228 if (r < 0) {
229 log_unit_warning_errno(UNIT(s), r, "Failed to add watchdog timer: %m");
230 return;
231 }
232
233 (void) sd_event_source_set_description(s->watchdog_event_source, "service-watchdog");
234
235 /* Let's process everything else which might be a sign
236 * of living before we consider a service died. */
237 r = sd_event_source_set_priority(s->watchdog_event_source, SD_EVENT_PRIORITY_IDLE);
238 }
239 if (r < 0)
240 log_unit_warning_errno(UNIT(s), r, "Failed to install watchdog timer: %m");
241 }
242
243 static void service_extend_event_source_timeout(Service *s, sd_event_source *source, usec_t extended) {
244 usec_t current;
245 int r;
246
247 assert(s);
248
249 /* Extends the specified event source timer to at least the specified time, unless it is already later
250 * anyway. */
251
252 if (!source)
253 return;
254
255 r = sd_event_source_get_time(source, &current);
256 if (r < 0) {
257 const char *desc;
258 (void) sd_event_source_get_description(s->timer_event_source, &desc);
259 log_unit_warning_errno(UNIT(s), r, "Failed to retrieve timeout time for event source '%s', ignoring: %m", strna(desc));
260 return;
261 }
262
263 if (current >= extended) /* Current timeout is already longer, ignore this. */
264 return;
265
266 r = sd_event_source_set_time(source, extended);
267 if (r < 0) {
268 const char *desc;
269 (void) sd_event_source_get_description(s->timer_event_source, &desc);
270 log_unit_warning_errno(UNIT(s), r, "Failed to set timeout time for even source '%s', ignoring %m", strna(desc));
271 }
272 }
273
274 static void service_extend_timeout(Service *s, usec_t extend_timeout_usec) {
275 usec_t extended;
276
277 assert(s);
278
279 if (IN_SET(extend_timeout_usec, 0, USEC_INFINITY))
280 return;
281
282 extended = usec_add(now(CLOCK_MONOTONIC), extend_timeout_usec);
283
284 service_extend_event_source_timeout(s, s->timer_event_source, extended);
285 service_extend_event_source_timeout(s, s->watchdog_event_source, extended);
286 }
287
288 static void service_reset_watchdog(Service *s) {
289 assert(s);
290
291 dual_timestamp_get(&s->watchdog_timestamp);
292 service_start_watchdog(s);
293 }
294
295 static void service_override_watchdog_timeout(Service *s, usec_t watchdog_override_usec) {
296 assert(s);
297
298 s->watchdog_override_enable = true;
299 s->watchdog_override_usec = watchdog_override_usec;
300 service_reset_watchdog(s);
301
302 log_unit_debug(UNIT(s), "watchdog_usec="USEC_FMT, s->watchdog_usec);
303 log_unit_debug(UNIT(s), "watchdog_override_usec="USEC_FMT, s->watchdog_override_usec);
304 }
305
306 static void service_fd_store_unlink(ServiceFDStore *fs) {
307
308 if (!fs)
309 return;
310
311 if (fs->service) {
312 assert(fs->service->n_fd_store > 0);
313 LIST_REMOVE(fd_store, fs->service->fd_store, fs);
314 fs->service->n_fd_store--;
315 }
316
317 if (fs->event_source) {
318 sd_event_source_set_enabled(fs->event_source, SD_EVENT_OFF);
319 sd_event_source_unref(fs->event_source);
320 }
321
322 free(fs->fdname);
323 safe_close(fs->fd);
324 free(fs);
325 }
326
327 static void service_release_fd_store(Service *s) {
328 assert(s);
329
330 if (s->n_keep_fd_store > 0)
331 return;
332
333 log_unit_debug(UNIT(s), "Releasing all stored fds");
334 while (s->fd_store)
335 service_fd_store_unlink(s->fd_store);
336
337 assert(s->n_fd_store == 0);
338 }
339
340 static void service_release_resources(Unit *u) {
341 Service *s = SERVICE(u);
342
343 assert(s);
344
345 if (!s->fd_store && s->stdin_fd < 0 && s->stdout_fd < 0 && s->stderr_fd < 0)
346 return;
347
348 log_unit_debug(u, "Releasing resources.");
349
350 s->stdin_fd = safe_close(s->stdin_fd);
351 s->stdout_fd = safe_close(s->stdout_fd);
352 s->stderr_fd = safe_close(s->stderr_fd);
353
354 service_release_fd_store(s);
355 }
356
357 static void service_done(Unit *u) {
358 Service *s = SERVICE(u);
359
360 assert(s);
361
362 s->pid_file = mfree(s->pid_file);
363 s->status_text = mfree(s->status_text);
364
365 s->exec_runtime = exec_runtime_unref(s->exec_runtime, false);
366 exec_command_free_array(s->exec_command, _SERVICE_EXEC_COMMAND_MAX);
367 s->control_command = NULL;
368 s->main_command = NULL;
369
370 dynamic_creds_unref(&s->dynamic_creds);
371
372 exit_status_set_free(&s->restart_prevent_status);
373 exit_status_set_free(&s->restart_force_status);
374 exit_status_set_free(&s->success_status);
375
376 /* This will leak a process, but at least no memory or any of
377 * our resources */
378 service_unwatch_main_pid(s);
379 service_unwatch_control_pid(s);
380 service_unwatch_pid_file(s);
381
382 if (s->bus_name) {
383 unit_unwatch_bus_name(u, s->bus_name);
384 s->bus_name = mfree(s->bus_name);
385 }
386
387 s->bus_name_owner = mfree(s->bus_name_owner);
388
389 s->usb_function_descriptors = mfree(s->usb_function_descriptors);
390 s->usb_function_strings = mfree(s->usb_function_strings);
391
392 service_close_socket_fd(s);
393 s->peer = socket_peer_unref(s->peer);
394
395 unit_ref_unset(&s->accept_socket);
396
397 service_stop_watchdog(s);
398
399 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
400 s->exec_fd_event_source = sd_event_source_unref(s->exec_fd_event_source);
401
402 service_release_resources(u);
403 }
404
405 static int on_fd_store_io(sd_event_source *e, int fd, uint32_t revents, void *userdata) {
406 ServiceFDStore *fs = userdata;
407
408 assert(e);
409 assert(fs);
410
411 /* If we get either EPOLLHUP or EPOLLERR, it's time to remove this entry from the fd store */
412 log_unit_debug(UNIT(fs->service),
413 "Received %s on stored fd %d (%s), closing.",
414 revents & EPOLLERR ? "EPOLLERR" : "EPOLLHUP",
415 fs->fd, strna(fs->fdname));
416 service_fd_store_unlink(fs);
417 return 0;
418 }
419
420 static int service_add_fd_store(Service *s, int fd, const char *name) {
421 ServiceFDStore *fs;
422 int r;
423
424 /* fd is always consumed if we return >= 0 */
425
426 assert(s);
427 assert(fd >= 0);
428
429 if (s->n_fd_store >= s->n_fd_store_max)
430 return -EXFULL; /* Our store is full.
431 * Use this errno rather than E[NM]FILE to distinguish from
432 * the case where systemd itself hits the file limit. */
433
434 LIST_FOREACH(fd_store, fs, s->fd_store) {
435 r = same_fd(fs->fd, fd);
436 if (r < 0)
437 return r;
438 if (r > 0) {
439 safe_close(fd);
440 return 0; /* fd already included */
441 }
442 }
443
444 fs = new0(ServiceFDStore, 1);
445 if (!fs)
446 return -ENOMEM;
447
448 fs->fd = fd;
449 fs->service = s;
450 fs->fdname = strdup(name ?: "stored");
451 if (!fs->fdname) {
452 free(fs);
453 return -ENOMEM;
454 }
455
456 r = sd_event_add_io(UNIT(s)->manager->event, &fs->event_source, fd, 0, on_fd_store_io, fs);
457 if (r < 0 && r != -EPERM) { /* EPERM indicates fds that aren't pollable, which is OK */
458 free(fs->fdname);
459 free(fs);
460 return r;
461 } else if (r >= 0)
462 (void) sd_event_source_set_description(fs->event_source, "service-fd-store");
463
464 LIST_PREPEND(fd_store, s->fd_store, fs);
465 s->n_fd_store++;
466
467 return 1; /* fd newly stored */
468 }
469
470 static int service_add_fd_store_set(Service *s, FDSet *fds, const char *name) {
471 int r;
472
473 assert(s);
474
475 while (fdset_size(fds) > 0) {
476 _cleanup_close_ int fd = -1;
477
478 fd = fdset_steal_first(fds);
479 if (fd < 0)
480 break;
481
482 r = service_add_fd_store(s, fd, name);
483 if (r == -EXFULL)
484 return log_unit_warning_errno(UNIT(s), r,
485 "Cannot store more fds than FileDescriptorStoreMax=%u, closing remaining.",
486 s->n_fd_store_max);
487 if (r < 0)
488 return log_unit_error_errno(UNIT(s), r, "Failed to add fd to store: %m");
489 if (r > 0)
490 log_unit_debug(UNIT(s), "Added fd %u (%s) to fd store.", fd, strna(name));
491 fd = -1;
492 }
493
494 return 0;
495 }
496
497 static void service_remove_fd_store(Service *s, const char *name) {
498 ServiceFDStore *fs, *n;
499
500 assert(s);
501 assert(name);
502
503 LIST_FOREACH_SAFE(fd_store, fs, n, s->fd_store) {
504 if (!streq(fs->fdname, name))
505 continue;
506
507 log_unit_debug(UNIT(s), "Got explicit request to remove fd %i (%s), closing.", fs->fd, name);
508 service_fd_store_unlink(fs);
509 }
510 }
511
512 static int service_arm_timer(Service *s, usec_t usec) {
513 int r;
514
515 assert(s);
516
517 if (s->timer_event_source) {
518 r = sd_event_source_set_time(s->timer_event_source, usec);
519 if (r < 0)
520 return r;
521
522 return sd_event_source_set_enabled(s->timer_event_source, SD_EVENT_ONESHOT);
523 }
524
525 if (usec == USEC_INFINITY)
526 return 0;
527
528 r = sd_event_add_time(
529 UNIT(s)->manager->event,
530 &s->timer_event_source,
531 CLOCK_MONOTONIC,
532 usec, 0,
533 service_dispatch_timer, s);
534 if (r < 0)
535 return r;
536
537 (void) sd_event_source_set_description(s->timer_event_source, "service-timer");
538
539 return 0;
540 }
541
542 static int service_verify(Service *s) {
543 assert(s);
544
545 if (UNIT(s)->load_state != UNIT_LOADED)
546 return 0;
547
548 if (!s->exec_command[SERVICE_EXEC_START] && !s->exec_command[SERVICE_EXEC_STOP]
549 && UNIT(s)->success_action == EMERGENCY_ACTION_NONE) {
550 /* FailureAction= only makes sense if one of the start or stop commands is specified.
551 * SuccessAction= will be executed unconditionally if no commands are specified. Hence,
552 * either a command or SuccessAction= are required. */
553
554 log_unit_error(UNIT(s), "Service has no ExecStart=, ExecStop=, or SuccessAction=. Refusing.");
555 return -ENOEXEC;
556 }
557
558 if (s->type != SERVICE_ONESHOT && !s->exec_command[SERVICE_EXEC_START]) {
559 log_unit_error(UNIT(s), "Service has no ExecStart= setting, which is only allowed for Type=oneshot services. Refusing.");
560 return -ENOEXEC;
561 }
562
563 if (!s->remain_after_exit && !s->exec_command[SERVICE_EXEC_START] && UNIT(s)->success_action == EMERGENCY_ACTION_NONE) {
564 log_unit_error(UNIT(s), "Service has no ExecStart= and no SuccessAction= settings and does not have RemainAfterExit=yes set. Refusing.");
565 return -ENOEXEC;
566 }
567
568 if (s->type != SERVICE_ONESHOT && s->exec_command[SERVICE_EXEC_START]->command_next) {
569 log_unit_error(UNIT(s), "Service has more than one ExecStart= setting, which is only allowed for Type=oneshot services. Refusing.");
570 return -ENOEXEC;
571 }
572
573 if (s->type == SERVICE_ONESHOT && s->restart != SERVICE_RESTART_NO) {
574 log_unit_error(UNIT(s), "Service has Restart= setting other than no, which isn't allowed for Type=oneshot services. Refusing.");
575 return -ENOEXEC;
576 }
577
578 if (s->type == SERVICE_ONESHOT && !exit_status_set_is_empty(&s->restart_force_status)) {
579 log_unit_error(UNIT(s), "Service has RestartForceStatus= set, which isn't allowed for Type=oneshot services. Refusing.");
580 return -ENOEXEC;
581 }
582
583 if (s->type == SERVICE_DBUS && !s->bus_name) {
584 log_unit_error(UNIT(s), "Service is of type D-Bus but no D-Bus service name has been specified. Refusing.");
585 return -ENOEXEC;
586 }
587
588 if (s->bus_name && s->type != SERVICE_DBUS)
589 log_unit_warning(UNIT(s), "Service has a D-Bus service name specified, but is not of type dbus. Ignoring.");
590
591 if (s->exec_context.pam_name && !IN_SET(s->kill_context.kill_mode, KILL_CONTROL_GROUP, KILL_MIXED)) {
592 log_unit_error(UNIT(s), "Service has PAM enabled. Kill mode must be set to 'control-group' or 'mixed'. Refusing.");
593 return -ENOEXEC;
594 }
595
596 if (s->usb_function_descriptors && !s->usb_function_strings)
597 log_unit_warning(UNIT(s), "Service has USBFunctionDescriptors= setting, but no USBFunctionStrings=. Ignoring.");
598
599 if (!s->usb_function_descriptors && s->usb_function_strings)
600 log_unit_warning(UNIT(s), "Service has USBFunctionStrings= setting, but no USBFunctionDescriptors=. Ignoring.");
601
602 if (s->runtime_max_usec != USEC_INFINITY && s->type == SERVICE_ONESHOT)
603 log_unit_warning(UNIT(s), "MaxRuntimeSec= has no effect in combination with Type=oneshot. Ignoring.");
604
605 return 0;
606 }
607
608 static int service_add_default_dependencies(Service *s) {
609 int r;
610
611 assert(s);
612
613 if (!UNIT(s)->default_dependencies)
614 return 0;
615
616 /* Add a number of automatic dependencies useful for the
617 * majority of services. */
618
619 if (MANAGER_IS_SYSTEM(UNIT(s)->manager)) {
620 /* First, pull in the really early boot stuff, and
621 * require it, so that we fail if we can't acquire
622 * it. */
623
624 r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SYSINIT_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
625 if (r < 0)
626 return r;
627 } else {
628
629 /* In the --user instance there's no sysinit.target,
630 * in that case require basic.target instead. */
631
632 r = unit_add_dependency_by_name(UNIT(s), UNIT_REQUIRES, SPECIAL_BASIC_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
633 if (r < 0)
634 return r;
635 }
636
637 /* Second, if the rest of the base system is in the same
638 * transaction, order us after it, but do not pull it in or
639 * even require it. */
640 r = unit_add_dependency_by_name(UNIT(s), UNIT_AFTER, SPECIAL_BASIC_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
641 if (r < 0)
642 return r;
643
644 /* Third, add us in for normal shutdown. */
645 return unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
646 }
647
648 static void service_fix_output(Service *s) {
649 assert(s);
650
651 /* If nothing has been explicitly configured, patch default output in. If input is socket/tty we avoid this
652 * however, since in that case we want output to default to the same place as we read input from. */
653
654 if (s->exec_context.std_error == EXEC_OUTPUT_INHERIT &&
655 s->exec_context.std_output == EXEC_OUTPUT_INHERIT &&
656 s->exec_context.std_input == EXEC_INPUT_NULL)
657 s->exec_context.std_error = UNIT(s)->manager->default_std_error;
658
659 if (s->exec_context.std_output == EXEC_OUTPUT_INHERIT &&
660 s->exec_context.std_input == EXEC_INPUT_NULL)
661 s->exec_context.std_output = UNIT(s)->manager->default_std_output;
662
663 if (s->exec_context.std_input == EXEC_INPUT_NULL &&
664 s->exec_context.stdin_data_size > 0)
665 s->exec_context.std_input = EXEC_INPUT_DATA;
666 }
667
668 static int service_setup_bus_name(Service *s) {
669 int r;
670
671 assert(s);
672
673 if (!s->bus_name)
674 return 0;
675
676 r = unit_add_dependency_by_name(UNIT(s), UNIT_REQUIRES, SPECIAL_DBUS_SOCKET, true, UNIT_DEPENDENCY_FILE);
677 if (r < 0)
678 return log_unit_error_errno(UNIT(s), r, "Failed to add dependency on " SPECIAL_DBUS_SOCKET ": %m");
679
680 /* We always want to be ordered against dbus.socket if both are in the transaction. */
681 r = unit_add_dependency_by_name(UNIT(s), UNIT_AFTER, SPECIAL_DBUS_SOCKET, true, UNIT_DEPENDENCY_FILE);
682 if (r < 0)
683 return log_unit_error_errno(UNIT(s), r, "Failed to add dependency on " SPECIAL_DBUS_SOCKET ": %m");
684
685 r = unit_watch_bus_name(UNIT(s), s->bus_name);
686 if (r == -EEXIST)
687 return log_unit_error_errno(UNIT(s), r, "Two services allocated for the same bus name %s, refusing operation.", s->bus_name);
688 if (r < 0)
689 return log_unit_error_errno(UNIT(s), r, "Cannot watch bus name %s: %m", s->bus_name);
690
691 return 0;
692 }
693
694 static int service_add_extras(Service *s) {
695 int r;
696
697 assert(s);
698
699 if (s->type == _SERVICE_TYPE_INVALID) {
700 /* Figure out a type automatically */
701 if (s->bus_name)
702 s->type = SERVICE_DBUS;
703 else if (s->exec_command[SERVICE_EXEC_START])
704 s->type = SERVICE_SIMPLE;
705 else
706 s->type = SERVICE_ONESHOT;
707 }
708
709 /* Oneshot services have disabled start timeout by default */
710 if (s->type == SERVICE_ONESHOT && !s->start_timeout_defined)
711 s->timeout_start_usec = USEC_INFINITY;
712
713 service_fix_output(s);
714
715 r = unit_patch_contexts(UNIT(s));
716 if (r < 0)
717 return r;
718
719 r = unit_add_exec_dependencies(UNIT(s), &s->exec_context);
720 if (r < 0)
721 return r;
722
723 r = unit_set_default_slice(UNIT(s));
724 if (r < 0)
725 return r;
726
727 /* If the service needs the notify socket, let's enable it automatically. */
728 if (s->notify_access == NOTIFY_NONE &&
729 (s->type == SERVICE_NOTIFY || s->watchdog_usec > 0 || s->n_fd_store_max > 0))
730 s->notify_access = NOTIFY_MAIN;
731
732 r = service_add_default_dependencies(s);
733 if (r < 0)
734 return r;
735
736 r = service_setup_bus_name(s);
737 if (r < 0)
738 return r;
739
740 return 0;
741 }
742
743 static int service_load(Unit *u) {
744 Service *s = SERVICE(u);
745 int r;
746
747 assert(s);
748
749 /* Load a .service file */
750 r = unit_load_fragment(u);
751 if (r < 0)
752 return r;
753
754 /* Still nothing found? Then let's give up */
755 if (u->load_state == UNIT_STUB)
756 return -ENOENT;
757
758 /* This is a new unit? Then let's add in some extras */
759 if (u->load_state == UNIT_LOADED) {
760
761 /* We were able to load something, then let's add in
762 * the dropin directories. */
763 r = unit_load_dropin(u);
764 if (r < 0)
765 return r;
766
767 /* This is a new unit? Then let's add in some
768 * extras */
769 r = service_add_extras(s);
770 if (r < 0)
771 return r;
772 }
773
774 return service_verify(s);
775 }
776
777 static void service_dump(Unit *u, FILE *f, const char *prefix) {
778 char buf_restart[FORMAT_TIMESPAN_MAX], buf_start[FORMAT_TIMESPAN_MAX], buf_stop[FORMAT_TIMESPAN_MAX];
779 char buf_runtime[FORMAT_TIMESPAN_MAX], buf_watchdog[FORMAT_TIMESPAN_MAX];
780 ServiceExecCommand c;
781 Service *s = SERVICE(u);
782 const char *prefix2;
783
784 assert(s);
785
786 prefix = strempty(prefix);
787 prefix2 = strjoina(prefix, "\t");
788
789 fprintf(f,
790 "%sService State: %s\n"
791 "%sResult: %s\n"
792 "%sReload Result: %s\n"
793 "%sPermissionsStartOnly: %s\n"
794 "%sRootDirectoryStartOnly: %s\n"
795 "%sRemainAfterExit: %s\n"
796 "%sGuessMainPID: %s\n"
797 "%sType: %s\n"
798 "%sRestart: %s\n"
799 "%sNotifyAccess: %s\n"
800 "%sNotifyState: %s\n",
801 prefix, service_state_to_string(s->state),
802 prefix, service_result_to_string(s->result),
803 prefix, service_result_to_string(s->reload_result),
804 prefix, yes_no(s->permissions_start_only),
805 prefix, yes_no(s->root_directory_start_only),
806 prefix, yes_no(s->remain_after_exit),
807 prefix, yes_no(s->guess_main_pid),
808 prefix, service_type_to_string(s->type),
809 prefix, service_restart_to_string(s->restart),
810 prefix, notify_access_to_string(s->notify_access),
811 prefix, notify_state_to_string(s->notify_state));
812
813 if (s->control_pid > 0)
814 fprintf(f,
815 "%sControl PID: "PID_FMT"\n",
816 prefix, s->control_pid);
817
818 if (s->main_pid > 0)
819 fprintf(f,
820 "%sMain PID: "PID_FMT"\n"
821 "%sMain PID Known: %s\n"
822 "%sMain PID Alien: %s\n",
823 prefix, s->main_pid,
824 prefix, yes_no(s->main_pid_known),
825 prefix, yes_no(s->main_pid_alien));
826
827 if (s->pid_file)
828 fprintf(f,
829 "%sPIDFile: %s\n",
830 prefix, s->pid_file);
831
832 if (s->bus_name)
833 fprintf(f,
834 "%sBusName: %s\n"
835 "%sBus Name Good: %s\n",
836 prefix, s->bus_name,
837 prefix, yes_no(s->bus_name_good));
838
839 if (UNIT_ISSET(s->accept_socket))
840 fprintf(f,
841 "%sAccept Socket: %s\n",
842 prefix, UNIT_DEREF(s->accept_socket)->id);
843
844 fprintf(f,
845 "%sRestartSec: %s\n"
846 "%sTimeoutStartSec: %s\n"
847 "%sTimeoutStopSec: %s\n"
848 "%sRuntimeMaxSec: %s\n"
849 "%sWatchdogSec: %s\n",
850 prefix, format_timespan(buf_restart, sizeof(buf_restart), s->restart_usec, USEC_PER_SEC),
851 prefix, format_timespan(buf_start, sizeof(buf_start), s->timeout_start_usec, USEC_PER_SEC),
852 prefix, format_timespan(buf_stop, sizeof(buf_stop), s->timeout_stop_usec, USEC_PER_SEC),
853 prefix, format_timespan(buf_runtime, sizeof(buf_runtime), s->runtime_max_usec, USEC_PER_SEC),
854 prefix, format_timespan(buf_watchdog, sizeof(buf_watchdog), s->watchdog_usec, USEC_PER_SEC));
855
856 kill_context_dump(&s->kill_context, f, prefix);
857 exec_context_dump(&s->exec_context, f, prefix);
858
859 for (c = 0; c < _SERVICE_EXEC_COMMAND_MAX; c++) {
860
861 if (!s->exec_command[c])
862 continue;
863
864 fprintf(f, "%s-> %s:\n",
865 prefix, service_exec_command_to_string(c));
866
867 exec_command_dump_list(s->exec_command[c], f, prefix2);
868 }
869
870 if (s->status_text)
871 fprintf(f, "%sStatus Text: %s\n",
872 prefix, s->status_text);
873
874 if (s->n_fd_store_max > 0)
875 fprintf(f,
876 "%sFile Descriptor Store Max: %u\n"
877 "%sFile Descriptor Store Current: %zu\n",
878 prefix, s->n_fd_store_max,
879 prefix, s->n_fd_store);
880
881 cgroup_context_dump(&s->cgroup_context, f, prefix);
882 }
883
884 static int service_is_suitable_main_pid(Service *s, pid_t pid, int prio) {
885 Unit *owner;
886
887 assert(s);
888 assert(pid_is_valid(pid));
889
890 /* Checks whether the specified PID is suitable as main PID for this service. returns negative if not, 0 if the
891 * PID is questionnable but should be accepted if the source of configuration is trusted. > 0 if the PID is
892 * good */
893
894 if (pid == getpid_cached() || pid == 1) {
895 log_unit_full(UNIT(s), prio, 0, "New main PID "PID_FMT" is the manager, refusing.", pid);
896 return -EPERM;
897 }
898
899 if (pid == s->control_pid) {
900 log_unit_full(UNIT(s), prio, 0, "New main PID "PID_FMT" is the control process, refusing.", pid);
901 return -EPERM;
902 }
903
904 if (!pid_is_alive(pid)) {
905 log_unit_full(UNIT(s), prio, 0, "New main PID "PID_FMT" does not exist or is a zombie.", pid);
906 return -ESRCH;
907 }
908
909 owner = manager_get_unit_by_pid(UNIT(s)->manager, pid);
910 if (owner == UNIT(s)) {
911 log_unit_debug(UNIT(s), "New main PID "PID_FMT" belongs to service, we are happy.", pid);
912 return 1; /* Yay, it's definitely a good PID */
913 }
914
915 return 0; /* Hmm it's a suspicious PID, let's accept it if configuration source is trusted */
916 }
917
918 static int service_load_pid_file(Service *s, bool may_warn) {
919 char procfs[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
920 bool questionable_pid_file = false;
921 _cleanup_free_ char *k = NULL;
922 _cleanup_close_ int fd = -1;
923 int r, prio;
924 pid_t pid;
925
926 assert(s);
927
928 if (!s->pid_file)
929 return -ENOENT;
930
931 prio = may_warn ? LOG_INFO : LOG_DEBUG;
932
933 fd = chase_symlinks(s->pid_file, NULL, CHASE_OPEN|CHASE_SAFE, NULL);
934 if (fd == -ENOLINK) {
935 log_unit_full(UNIT(s), LOG_DEBUG, fd, "Potentially unsafe symlink chain, will now retry with relaxed checks: %s", s->pid_file);
936
937 questionable_pid_file = true;
938
939 fd = chase_symlinks(s->pid_file, NULL, CHASE_OPEN, NULL);
940 }
941 if (fd < 0)
942 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));
943
944 /* 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. */
945 xsprintf(procfs, "/proc/self/fd/%i", fd);
946 r = read_one_line_file(procfs, &k);
947 if (r < 0)
948 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);
949
950 r = parse_pid(k, &pid);
951 if (r < 0)
952 return log_unit_full(UNIT(s), prio, r, "Failed to parse PID from file %s: %m", s->pid_file);
953
954 if (s->main_pid_known && pid == s->main_pid)
955 return 0;
956
957 r = service_is_suitable_main_pid(s, pid, prio);
958 if (r < 0)
959 return r;
960 if (r == 0) {
961 struct stat st;
962
963 if (questionable_pid_file) {
964 log_unit_error(UNIT(s), "Refusing to accept PID outside of service control group, acquired through unsafe symlink chain: %s", s->pid_file);
965 return -EPERM;
966 }
967
968 /* Hmm, it's not clear if the new main PID is safe. Let's allow this if the PID file is owned by root */
969
970 if (fstat(fd, &st) < 0)
971 return log_unit_error_errno(UNIT(s), errno, "Failed to fstat() PID file O_PATH fd: %m");
972
973 if (st.st_uid != 0) {
974 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);
975 return -EPERM;
976 }
977
978 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);
979 }
980
981 if (s->main_pid_known) {
982 log_unit_debug(UNIT(s), "Main PID changing: "PID_FMT" -> "PID_FMT, s->main_pid, pid);
983
984 service_unwatch_main_pid(s);
985 s->main_pid_known = false;
986 } else
987 log_unit_debug(UNIT(s), "Main PID loaded: "PID_FMT, pid);
988
989 r = service_set_main_pid(s, pid);
990 if (r < 0)
991 return r;
992
993 r = unit_watch_pid(UNIT(s), pid, false);
994 if (r < 0) /* FIXME: we need to do something here */
995 return log_unit_warning_errno(UNIT(s), r, "Failed to watch PID "PID_FMT" for service: %m", pid);
996
997 return 1;
998 }
999
1000 static void service_search_main_pid(Service *s) {
1001 pid_t pid = 0;
1002 int r;
1003
1004 assert(s);
1005
1006 /* If we know it anyway, don't ever fallback to unreliable
1007 * heuristics */
1008 if (s->main_pid_known)
1009 return;
1010
1011 if (!s->guess_main_pid)
1012 return;
1013
1014 assert(s->main_pid <= 0);
1015
1016 if (unit_search_main_pid(UNIT(s), &pid) < 0)
1017 return;
1018
1019 log_unit_debug(UNIT(s), "Main PID guessed: "PID_FMT, pid);
1020 if (service_set_main_pid(s, pid) < 0)
1021 return;
1022
1023 r = unit_watch_pid(UNIT(s), pid, false);
1024 if (r < 0)
1025 /* FIXME: we need to do something here */
1026 log_unit_warning_errno(UNIT(s), r, "Failed to watch PID "PID_FMT" from: %m", pid);
1027 }
1028
1029 static void service_set_state(Service *s, ServiceState state) {
1030 ServiceState old_state;
1031 const UnitActiveState *table;
1032
1033 assert(s);
1034
1035 if (s->state != state)
1036 bus_unit_send_pending_change_signal(UNIT(s), false);
1037
1038 table = s->type == SERVICE_IDLE ? state_translation_table_idle : state_translation_table;
1039
1040 old_state = s->state;
1041 s->state = state;
1042
1043 service_unwatch_pid_file(s);
1044
1045 if (!IN_SET(state,
1046 SERVICE_START_PRE, SERVICE_START, SERVICE_START_POST,
1047 SERVICE_RUNNING,
1048 SERVICE_RELOAD,
1049 SERVICE_STOP, SERVICE_STOP_WATCHDOG, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL, SERVICE_STOP_POST,
1050 SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL,
1051 SERVICE_AUTO_RESTART))
1052 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
1053
1054 if (!IN_SET(state,
1055 SERVICE_START, SERVICE_START_POST,
1056 SERVICE_RUNNING, SERVICE_RELOAD,
1057 SERVICE_STOP, SERVICE_STOP_WATCHDOG, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL, SERVICE_STOP_POST,
1058 SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL)) {
1059 service_unwatch_main_pid(s);
1060 s->main_command = NULL;
1061 }
1062
1063 if (!IN_SET(state,
1064 SERVICE_START_PRE, SERVICE_START, SERVICE_START_POST,
1065 SERVICE_RELOAD,
1066 SERVICE_STOP, SERVICE_STOP_WATCHDOG, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL, SERVICE_STOP_POST,
1067 SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL)) {
1068 service_unwatch_control_pid(s);
1069 s->control_command = NULL;
1070 s->control_command_id = _SERVICE_EXEC_COMMAND_INVALID;
1071 }
1072
1073 if (IN_SET(state, SERVICE_DEAD, SERVICE_FAILED, SERVICE_AUTO_RESTART)) {
1074 unit_unwatch_all_pids(UNIT(s));
1075 unit_dequeue_rewatch_pids(UNIT(s));
1076 }
1077
1078 if (!IN_SET(state,
1079 SERVICE_START_PRE, SERVICE_START, SERVICE_START_POST,
1080 SERVICE_RUNNING, SERVICE_RELOAD,
1081 SERVICE_STOP, SERVICE_STOP_WATCHDOG, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL, SERVICE_STOP_POST,
1082 SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL) &&
1083 !(state == SERVICE_DEAD && UNIT(s)->job))
1084 service_close_socket_fd(s);
1085
1086 if (state != SERVICE_START)
1087 s->exec_fd_event_source = sd_event_source_unref(s->exec_fd_event_source);
1088
1089 if (!IN_SET(state, SERVICE_START_POST, SERVICE_RUNNING, SERVICE_RELOAD))
1090 service_stop_watchdog(s);
1091
1092 /* For the inactive states unit_notify() will trim the cgroup,
1093 * but for exit we have to do that ourselves... */
1094 if (state == SERVICE_EXITED && !MANAGER_IS_RELOADING(UNIT(s)->manager))
1095 unit_prune_cgroup(UNIT(s));
1096
1097 if (old_state != state)
1098 log_unit_debug(UNIT(s), "Changed %s -> %s", service_state_to_string(old_state), service_state_to_string(state));
1099
1100 unit_notify(UNIT(s), table[old_state], table[state],
1101 (s->reload_result == SERVICE_SUCCESS ? 0 : UNIT_NOTIFY_RELOAD_FAILURE) |
1102 (s->will_auto_restart ? UNIT_NOTIFY_WILL_AUTO_RESTART : 0));
1103 }
1104
1105 static usec_t service_coldplug_timeout(Service *s) {
1106 assert(s);
1107
1108 switch (s->deserialized_state) {
1109
1110 case SERVICE_START_PRE:
1111 case SERVICE_START:
1112 case SERVICE_START_POST:
1113 case SERVICE_RELOAD:
1114 return usec_add(UNIT(s)->state_change_timestamp.monotonic, s->timeout_start_usec);
1115
1116 case SERVICE_RUNNING:
1117 return usec_add(UNIT(s)->active_enter_timestamp.monotonic, s->runtime_max_usec);
1118
1119 case SERVICE_STOP:
1120 case SERVICE_STOP_WATCHDOG:
1121 case SERVICE_STOP_SIGTERM:
1122 case SERVICE_STOP_SIGKILL:
1123 case SERVICE_STOP_POST:
1124 case SERVICE_FINAL_SIGTERM:
1125 case SERVICE_FINAL_SIGKILL:
1126 return usec_add(UNIT(s)->state_change_timestamp.monotonic, s->timeout_stop_usec);
1127
1128 case SERVICE_AUTO_RESTART:
1129 return usec_add(UNIT(s)->inactive_enter_timestamp.monotonic, s->restart_usec);
1130
1131 default:
1132 return USEC_INFINITY;
1133 }
1134 }
1135
1136 static int service_coldplug(Unit *u) {
1137 Service *s = SERVICE(u);
1138 int r;
1139
1140 assert(s);
1141 assert(s->state == SERVICE_DEAD);
1142
1143 if (s->deserialized_state == s->state)
1144 return 0;
1145
1146 r = service_arm_timer(s, service_coldplug_timeout(s));
1147 if (r < 0)
1148 return r;
1149
1150 if (s->main_pid > 0 &&
1151 pid_is_unwaited(s->main_pid) &&
1152 (IN_SET(s->deserialized_state,
1153 SERVICE_START, SERVICE_START_POST,
1154 SERVICE_RUNNING, SERVICE_RELOAD,
1155 SERVICE_STOP, SERVICE_STOP_WATCHDOG, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL, SERVICE_STOP_POST,
1156 SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL))) {
1157 r = unit_watch_pid(UNIT(s), s->main_pid, false);
1158 if (r < 0)
1159 return r;
1160 }
1161
1162 if (s->control_pid > 0 &&
1163 pid_is_unwaited(s->control_pid) &&
1164 IN_SET(s->deserialized_state,
1165 SERVICE_START_PRE, SERVICE_START, SERVICE_START_POST,
1166 SERVICE_RELOAD,
1167 SERVICE_STOP, SERVICE_STOP_WATCHDOG, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL, SERVICE_STOP_POST,
1168 SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL)) {
1169 r = unit_watch_pid(UNIT(s), s->control_pid, false);
1170 if (r < 0)
1171 return r;
1172 }
1173
1174 if (!IN_SET(s->deserialized_state, SERVICE_DEAD, SERVICE_FAILED, SERVICE_AUTO_RESTART)) {
1175 (void) unit_enqueue_rewatch_pids(u);
1176 (void) unit_setup_dynamic_creds(u);
1177 (void) unit_setup_exec_runtime(u);
1178 }
1179
1180 if (IN_SET(s->deserialized_state, SERVICE_START_POST, SERVICE_RUNNING, SERVICE_RELOAD))
1181 service_start_watchdog(s);
1182
1183 if (UNIT_ISSET(s->accept_socket)) {
1184 Socket* socket = SOCKET(UNIT_DEREF(s->accept_socket));
1185
1186 if (socket->max_connections_per_source > 0) {
1187 SocketPeer *peer;
1188
1189 /* Make a best-effort attempt at bumping the connection count */
1190 if (socket_acquire_peer(socket, s->socket_fd, &peer) > 0) {
1191 socket_peer_unref(s->peer);
1192 s->peer = peer;
1193 }
1194 }
1195 }
1196
1197 service_set_state(s, s->deserialized_state);
1198 return 0;
1199 }
1200
1201 static int service_collect_fds(
1202 Service *s,
1203 int **fds,
1204 char ***fd_names,
1205 size_t *n_socket_fds,
1206 size_t *n_storage_fds) {
1207
1208 _cleanup_strv_free_ char **rfd_names = NULL;
1209 _cleanup_free_ int *rfds = NULL;
1210 size_t rn_socket_fds = 0, rn_storage_fds = 0;
1211 int r;
1212
1213 assert(s);
1214 assert(fds);
1215 assert(fd_names);
1216 assert(n_socket_fds);
1217 assert(n_storage_fds);
1218
1219 if (s->socket_fd >= 0) {
1220
1221 /* Pass the per-connection socket */
1222
1223 rfds = new(int, 1);
1224 if (!rfds)
1225 return -ENOMEM;
1226 rfds[0] = s->socket_fd;
1227
1228 rfd_names = strv_new("connection");
1229 if (!rfd_names)
1230 return -ENOMEM;
1231
1232 rn_socket_fds = 1;
1233 } else {
1234 Iterator i;
1235 void *v;
1236 Unit *u;
1237
1238 /* Pass all our configured sockets for singleton services */
1239
1240 HASHMAP_FOREACH_KEY(v, u, UNIT(s)->dependencies[UNIT_TRIGGERED_BY], i) {
1241 _cleanup_free_ int *cfds = NULL;
1242 Socket *sock;
1243 int cn_fds;
1244
1245 if (u->type != UNIT_SOCKET)
1246 continue;
1247
1248 sock = SOCKET(u);
1249
1250 cn_fds = socket_collect_fds(sock, &cfds);
1251 if (cn_fds < 0)
1252 return cn_fds;
1253
1254 if (cn_fds <= 0)
1255 continue;
1256
1257 if (!rfds) {
1258 rfds = TAKE_PTR(cfds);
1259 rn_socket_fds = cn_fds;
1260 } else {
1261 int *t;
1262
1263 t = reallocarray(rfds, rn_socket_fds + cn_fds, sizeof(int));
1264 if (!t)
1265 return -ENOMEM;
1266
1267 memcpy(t + rn_socket_fds, cfds, cn_fds * sizeof(int));
1268
1269 rfds = t;
1270 rn_socket_fds += cn_fds;
1271 }
1272
1273 r = strv_extend_n(&rfd_names, socket_fdname(sock), cn_fds);
1274 if (r < 0)
1275 return r;
1276 }
1277 }
1278
1279 if (s->n_fd_store > 0) {
1280 ServiceFDStore *fs;
1281 size_t n_fds;
1282 char **nl;
1283 int *t;
1284
1285 t = reallocarray(rfds, rn_socket_fds + s->n_fd_store, sizeof(int));
1286 if (!t)
1287 return -ENOMEM;
1288
1289 rfds = t;
1290
1291 nl = reallocarray(rfd_names, rn_socket_fds + s->n_fd_store + 1, sizeof(char *));
1292 if (!nl)
1293 return -ENOMEM;
1294
1295 rfd_names = nl;
1296 n_fds = rn_socket_fds;
1297
1298 LIST_FOREACH(fd_store, fs, s->fd_store) {
1299 rfds[n_fds] = fs->fd;
1300 rfd_names[n_fds] = strdup(strempty(fs->fdname));
1301 if (!rfd_names[n_fds])
1302 return -ENOMEM;
1303
1304 rn_storage_fds++;
1305 n_fds++;
1306 }
1307
1308 rfd_names[n_fds] = NULL;
1309 }
1310
1311 *fds = TAKE_PTR(rfds);
1312 *fd_names = TAKE_PTR(rfd_names);
1313 *n_socket_fds = rn_socket_fds;
1314 *n_storage_fds = rn_storage_fds;
1315
1316 return 0;
1317 }
1318
1319 static int service_allocate_exec_fd_event_source(
1320 Service *s,
1321 int fd,
1322 sd_event_source **ret_event_source) {
1323
1324 _cleanup_(sd_event_source_unrefp) sd_event_source *source = NULL;
1325 int r;
1326
1327 assert(s);
1328 assert(fd >= 0);
1329 assert(ret_event_source);
1330
1331 r = sd_event_add_io(UNIT(s)->manager->event, &source, fd, 0, service_dispatch_exec_io, s);
1332 if (r < 0)
1333 return log_unit_error_errno(UNIT(s), r, "Failed to allocate exec_fd event source: %m");
1334
1335 /* This is a bit lower priority than SIGCHLD, as that carries a lot more interesting failure information */
1336
1337 r = sd_event_source_set_priority(source, SD_EVENT_PRIORITY_NORMAL-3);
1338 if (r < 0)
1339 return log_unit_error_errno(UNIT(s), r, "Failed to adjust priority of exec_fd event source: %m");
1340
1341 (void) sd_event_source_set_description(source, "service event_fd");
1342
1343 r = sd_event_source_set_io_fd_own(source, true);
1344 if (r < 0)
1345 return log_unit_error_errno(UNIT(s), r, "Failed to pass ownership of fd to event source: %m");
1346
1347 *ret_event_source = TAKE_PTR(source);
1348 return 0;
1349 }
1350
1351 static int service_allocate_exec_fd(
1352 Service *s,
1353 sd_event_source **ret_event_source,
1354 int* ret_exec_fd) {
1355
1356 _cleanup_close_pair_ int p[2] = { -1, -1 };
1357 int r;
1358
1359 assert(s);
1360 assert(ret_event_source);
1361 assert(ret_exec_fd);
1362
1363 if (pipe2(p, O_CLOEXEC|O_NONBLOCK) < 0)
1364 return log_unit_error_errno(UNIT(s), errno, "Failed to allocate exec_fd pipe: %m");
1365
1366 r = service_allocate_exec_fd_event_source(s, p[0], ret_event_source);
1367 if (r < 0)
1368 return r;
1369
1370 p[0] = -1;
1371 *ret_exec_fd = TAKE_FD(p[1]);
1372
1373 return 0;
1374 }
1375
1376 static bool service_exec_needs_notify_socket(Service *s, ExecFlags flags) {
1377 assert(s);
1378
1379 /* Notifications are accepted depending on the process and
1380 * the access setting of the service:
1381 * process: \ access: NONE MAIN EXEC ALL
1382 * main no yes yes yes
1383 * control no no yes yes
1384 * other (forked) no no no yes */
1385
1386 if (flags & EXEC_IS_CONTROL)
1387 /* A control process */
1388 return IN_SET(s->notify_access, NOTIFY_EXEC, NOTIFY_ALL);
1389
1390 /* We only spawn main processes and control processes, so any
1391 * process that is not a control process is a main process */
1392 return s->notify_access != NOTIFY_NONE;
1393 }
1394
1395 static int service_spawn(
1396 Service *s,
1397 ExecCommand *c,
1398 usec_t timeout,
1399 ExecFlags flags,
1400 pid_t *_pid) {
1401
1402 _cleanup_(exec_params_clear) ExecParameters exec_params = {
1403 .flags = flags,
1404 .stdin_fd = -1,
1405 .stdout_fd = -1,
1406 .stderr_fd = -1,
1407 .exec_fd = -1,
1408 };
1409 _cleanup_strv_free_ char **final_env = NULL, **our_env = NULL, **fd_names = NULL;
1410 _cleanup_(sd_event_source_unrefp) sd_event_source *exec_fd_source = NULL;
1411 size_t n_socket_fds = 0, n_storage_fds = 0, n_env = 0;
1412 _cleanup_close_ int exec_fd = -1;
1413 _cleanup_free_ int *fds = NULL;
1414 pid_t pid;
1415 int r;
1416
1417 assert(s);
1418 assert(c);
1419 assert(_pid);
1420
1421 r = unit_prepare_exec(UNIT(s)); /* This realizes the cgroup, among other things */
1422 if (r < 0)
1423 return r;
1424
1425 if (flags & EXEC_IS_CONTROL) {
1426 /* If this is a control process, mask the permissions/chroot application if this is requested. */
1427 if (s->permissions_start_only)
1428 exec_params.flags &= ~EXEC_APPLY_SANDBOXING;
1429 if (s->root_directory_start_only)
1430 exec_params.flags &= ~EXEC_APPLY_CHROOT;
1431 }
1432
1433 if ((flags & EXEC_PASS_FDS) ||
1434 s->exec_context.std_input == EXEC_INPUT_SOCKET ||
1435 s->exec_context.std_output == EXEC_OUTPUT_SOCKET ||
1436 s->exec_context.std_error == EXEC_OUTPUT_SOCKET) {
1437
1438 r = service_collect_fds(s, &fds, &fd_names, &n_socket_fds, &n_storage_fds);
1439 if (r < 0)
1440 return r;
1441
1442 log_unit_debug(UNIT(s), "Passing %zu fds to service", n_socket_fds + n_storage_fds);
1443 }
1444
1445 if (!FLAGS_SET(flags, EXEC_IS_CONTROL) && s->type == SERVICE_EXEC) {
1446 assert(!s->exec_fd_event_source);
1447
1448 r = service_allocate_exec_fd(s, &exec_fd_source, &exec_fd);
1449 if (r < 0)
1450 return r;
1451 }
1452
1453 r = service_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), timeout));
1454 if (r < 0)
1455 return r;
1456
1457 our_env = new0(char*, 10);
1458 if (!our_env)
1459 return -ENOMEM;
1460
1461 if (service_exec_needs_notify_socket(s, flags))
1462 if (asprintf(our_env + n_env++, "NOTIFY_SOCKET=%s", UNIT(s)->manager->notify_socket) < 0)
1463 return -ENOMEM;
1464
1465 if (s->main_pid > 0)
1466 if (asprintf(our_env + n_env++, "MAINPID="PID_FMT, s->main_pid) < 0)
1467 return -ENOMEM;
1468
1469 if (MANAGER_IS_USER(UNIT(s)->manager))
1470 if (asprintf(our_env + n_env++, "MANAGERPID="PID_FMT, getpid_cached()) < 0)
1471 return -ENOMEM;
1472
1473 if (s->pid_file)
1474 if (asprintf(our_env + n_env++, "PIDFILE=%s", s->pid_file) < 0)
1475 return -ENOMEM;
1476
1477 if (s->socket_fd >= 0) {
1478 union sockaddr_union sa;
1479 socklen_t salen = sizeof(sa);
1480
1481 /* If this is a per-connection service instance, let's set $REMOTE_ADDR and $REMOTE_PORT to something
1482 * useful. Note that we do this only when we are still connected at this point in time, which we might
1483 * very well not be. Hence we ignore all errors when retrieving peer information (as that might result
1484 * in ENOTCONN), and just use whate we can use. */
1485
1486 if (getpeername(s->socket_fd, &sa.sa, &salen) >= 0 &&
1487 IN_SET(sa.sa.sa_family, AF_INET, AF_INET6, AF_VSOCK)) {
1488
1489 _cleanup_free_ char *addr = NULL;
1490 char *t;
1491 unsigned port;
1492
1493 r = sockaddr_pretty(&sa.sa, salen, true, false, &addr);
1494 if (r < 0)
1495 return r;
1496
1497 t = strappend("REMOTE_ADDR=", addr);
1498 if (!t)
1499 return -ENOMEM;
1500 our_env[n_env++] = t;
1501
1502 r = sockaddr_port(&sa.sa, &port);
1503 if (r < 0)
1504 return r;
1505
1506 if (asprintf(&t, "REMOTE_PORT=%u", port) < 0)
1507 return -ENOMEM;
1508 our_env[n_env++] = t;
1509 }
1510 }
1511
1512 if (flags & EXEC_SETENV_RESULT) {
1513 if (asprintf(our_env + n_env++, "SERVICE_RESULT=%s", service_result_to_string(s->result)) < 0)
1514 return -ENOMEM;
1515
1516 if (s->main_exec_status.pid > 0 &&
1517 dual_timestamp_is_set(&s->main_exec_status.exit_timestamp)) {
1518 if (asprintf(our_env + n_env++, "EXIT_CODE=%s", sigchld_code_to_string(s->main_exec_status.code)) < 0)
1519 return -ENOMEM;
1520
1521 if (s->main_exec_status.code == CLD_EXITED)
1522 r = asprintf(our_env + n_env++, "EXIT_STATUS=%i", s->main_exec_status.status);
1523 else
1524 r = asprintf(our_env + n_env++, "EXIT_STATUS=%s", signal_to_string(s->main_exec_status.status));
1525 if (r < 0)
1526 return -ENOMEM;
1527 }
1528 }
1529
1530 r = unit_set_exec_params(UNIT(s), &exec_params);
1531 if (r < 0)
1532 return r;
1533
1534 final_env = strv_env_merge(2, exec_params.environment, our_env, NULL);
1535 if (!final_env)
1536 return -ENOMEM;
1537
1538 /* System D-Bus needs nss-systemd disabled, so that we don't deadlock */
1539 SET_FLAG(exec_params.flags, EXEC_NSS_BYPASS_BUS,
1540 MANAGER_IS_SYSTEM(UNIT(s)->manager) && unit_has_name(UNIT(s), SPECIAL_DBUS_SERVICE));
1541
1542 strv_free_and_replace(exec_params.environment, final_env);
1543 exec_params.fds = fds;
1544 exec_params.fd_names = fd_names;
1545 exec_params.n_socket_fds = n_socket_fds;
1546 exec_params.n_storage_fds = n_storage_fds;
1547 exec_params.watchdog_usec = service_get_watchdog_usec(s);
1548 exec_params.selinux_context_net = s->socket_fd_selinux_context_net;
1549 if (s->type == SERVICE_IDLE)
1550 exec_params.idle_pipe = UNIT(s)->manager->idle_pipe;
1551 exec_params.stdin_fd = s->stdin_fd;
1552 exec_params.stdout_fd = s->stdout_fd;
1553 exec_params.stderr_fd = s->stderr_fd;
1554 exec_params.exec_fd = exec_fd;
1555
1556 r = exec_spawn(UNIT(s),
1557 c,
1558 &s->exec_context,
1559 &exec_params,
1560 s->exec_runtime,
1561 &s->dynamic_creds,
1562 &pid);
1563 if (r < 0)
1564 return r;
1565
1566 s->exec_fd_event_source = TAKE_PTR(exec_fd_source);
1567 s->exec_fd_hot = false;
1568
1569 r = unit_watch_pid(UNIT(s), pid, true);
1570 if (r < 0)
1571 return r;
1572
1573 *_pid = pid;
1574
1575 return 0;
1576 }
1577
1578 static int main_pid_good(Service *s) {
1579 assert(s);
1580
1581 /* Returns 0 if the pid is dead, > 0 if it is good, < 0 if we don't know */
1582
1583 /* If we know the pid file, then let's just check if it is
1584 * still valid */
1585 if (s->main_pid_known) {
1586
1587 /* If it's an alien child let's check if it is still
1588 * alive ... */
1589 if (s->main_pid_alien && s->main_pid > 0)
1590 return pid_is_alive(s->main_pid);
1591
1592 /* .. otherwise assume we'll get a SIGCHLD for it,
1593 * which we really should wait for to collect exit
1594 * status and code */
1595 return s->main_pid > 0;
1596 }
1597
1598 /* We don't know the pid */
1599 return -EAGAIN;
1600 }
1601
1602 static int control_pid_good(Service *s) {
1603 assert(s);
1604
1605 /* Returns 0 if the control PID is dead, > 0 if it is good. We never actually return < 0 here, but in order to
1606 * make this function as similar as possible to main_pid_good() and cgroup_good(), we pretend that < 0 also
1607 * means: we can't figure it out. */
1608
1609 return s->control_pid > 0;
1610 }
1611
1612 static int cgroup_good(Service *s) {
1613 int r;
1614
1615 assert(s);
1616
1617 /* Returns 0 if the cgroup is empty or doesn't exist, > 0 if it is exists and is populated, < 0 if we can't
1618 * figure it out */
1619
1620 if (!UNIT(s)->cgroup_path)
1621 return 0;
1622
1623 r = cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER, UNIT(s)->cgroup_path);
1624 if (r < 0)
1625 return r;
1626
1627 return r == 0;
1628 }
1629
1630 static bool service_shall_restart(Service *s) {
1631 assert(s);
1632
1633 /* Don't restart after manual stops */
1634 if (s->forbid_restart)
1635 return false;
1636
1637 /* Never restart if this is configured as special exception */
1638 if (exit_status_set_test(&s->restart_prevent_status, s->main_exec_status.code, s->main_exec_status.status))
1639 return false;
1640
1641 /* Restart if the exit code/status are configured as restart triggers */
1642 if (exit_status_set_test(&s->restart_force_status, s->main_exec_status.code, s->main_exec_status.status))
1643 return true;
1644
1645 switch (s->restart) {
1646
1647 case SERVICE_RESTART_NO:
1648 return false;
1649
1650 case SERVICE_RESTART_ALWAYS:
1651 return true;
1652
1653 case SERVICE_RESTART_ON_SUCCESS:
1654 return s->result == SERVICE_SUCCESS;
1655
1656 case SERVICE_RESTART_ON_FAILURE:
1657 return s->result != SERVICE_SUCCESS;
1658
1659 case SERVICE_RESTART_ON_ABNORMAL:
1660 return !IN_SET(s->result, SERVICE_SUCCESS, SERVICE_FAILURE_EXIT_CODE);
1661
1662 case SERVICE_RESTART_ON_WATCHDOG:
1663 return s->result == SERVICE_FAILURE_WATCHDOG;
1664
1665 case SERVICE_RESTART_ON_ABORT:
1666 return IN_SET(s->result, SERVICE_FAILURE_SIGNAL, SERVICE_FAILURE_CORE_DUMP);
1667
1668 default:
1669 assert_not_reached("unknown restart setting");
1670 }
1671 }
1672
1673 static bool service_will_restart(Unit *u) {
1674 Service *s = SERVICE(u);
1675
1676 assert(s);
1677
1678 if (s->will_auto_restart)
1679 return true;
1680 if (s->state == SERVICE_AUTO_RESTART)
1681 return true;
1682 if (!UNIT(s)->job)
1683 return false;
1684 if (UNIT(s)->job->type == JOB_START)
1685 return true;
1686
1687 return false;
1688 }
1689
1690 static void service_enter_dead(Service *s, ServiceResult f, bool allow_restart) {
1691 int r;
1692
1693 assert(s);
1694
1695 /* If there's a stop job queued before we enter the DEAD state, we shouldn't act on Restart=, in order to not
1696 * undo what has already been enqueued. */
1697 if (unit_stop_pending(UNIT(s)))
1698 allow_restart = false;
1699
1700 if (s->result == SERVICE_SUCCESS)
1701 s->result = f;
1702
1703 unit_log_result(UNIT(s), s->result == SERVICE_SUCCESS, service_result_to_string(s->result));
1704
1705 if (allow_restart && service_shall_restart(s))
1706 s->will_auto_restart = true;
1707
1708 /* Make sure service_release_resources() doesn't destroy our FD store, while we are changing through
1709 * SERVICE_FAILED/SERVICE_DEAD before entering into SERVICE_AUTO_RESTART. */
1710 s->n_keep_fd_store ++;
1711
1712 service_set_state(s, s->result != SERVICE_SUCCESS ? SERVICE_FAILED : SERVICE_DEAD);
1713
1714 if (s->will_auto_restart) {
1715 s->will_auto_restart = false;
1716
1717 r = service_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->restart_usec));
1718 if (r < 0) {
1719 s->n_keep_fd_store--;
1720 goto fail;
1721 }
1722
1723 service_set_state(s, SERVICE_AUTO_RESTART);
1724 } else
1725 /* If we shan't restart, then flush out the restart counter. But don't do that immediately, so that the
1726 * user can still introspect the counter. Do so on the next start. */
1727 s->flush_n_restarts = true;
1728
1729 /* The new state is in effect, let's decrease the fd store ref counter again. Let's also readd us to the GC
1730 * queue, so that the fd store is possibly gc'ed again */
1731 s->n_keep_fd_store--;
1732 unit_add_to_gc_queue(UNIT(s));
1733
1734 /* The next restart might not be a manual stop, hence reset the flag indicating manual stops */
1735 s->forbid_restart = false;
1736
1737 /* We want fresh tmpdirs in case service is started again immediately */
1738 s->exec_runtime = exec_runtime_unref(s->exec_runtime, true);
1739
1740 if (s->exec_context.runtime_directory_preserve_mode == EXEC_PRESERVE_NO ||
1741 (s->exec_context.runtime_directory_preserve_mode == EXEC_PRESERVE_RESTART && !service_will_restart(UNIT(s))))
1742 /* Also, remove the runtime directory */
1743 exec_context_destroy_runtime_directory(&s->exec_context, UNIT(s)->manager->prefix[EXEC_DIRECTORY_RUNTIME]);
1744
1745 /* Get rid of the IPC bits of the user */
1746 unit_unref_uid_gid(UNIT(s), true);
1747
1748 /* Release the user, and destroy it if we are the only remaining owner */
1749 dynamic_creds_destroy(&s->dynamic_creds);
1750
1751 /* Try to delete the pid file. At this point it will be
1752 * out-of-date, and some software might be confused by it, so
1753 * let's remove it. */
1754 if (s->pid_file)
1755 (void) unlink(s->pid_file);
1756
1757 return;
1758
1759 fail:
1760 log_unit_warning_errno(UNIT(s), r, "Failed to run install restart timer: %m");
1761 service_enter_dead(s, SERVICE_FAILURE_RESOURCES, false);
1762 }
1763
1764 static void service_enter_stop_post(Service *s, ServiceResult f) {
1765 int r;
1766 assert(s);
1767
1768 if (s->result == SERVICE_SUCCESS)
1769 s->result = f;
1770
1771 service_unwatch_control_pid(s);
1772 (void) unit_enqueue_rewatch_pids(UNIT(s));
1773
1774 s->control_command = s->exec_command[SERVICE_EXEC_STOP_POST];
1775 if (s->control_command) {
1776 s->control_command_id = SERVICE_EXEC_STOP_POST;
1777
1778 r = service_spawn(s,
1779 s->control_command,
1780 s->timeout_stop_usec,
1781 EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN|EXEC_IS_CONTROL|EXEC_SETENV_RESULT|EXEC_CONTROL_CGROUP,
1782 &s->control_pid);
1783 if (r < 0)
1784 goto fail;
1785
1786 service_set_state(s, SERVICE_STOP_POST);
1787 } else
1788 service_enter_signal(s, SERVICE_FINAL_SIGTERM, SERVICE_SUCCESS);
1789
1790 return;
1791
1792 fail:
1793 log_unit_warning_errno(UNIT(s), r, "Failed to run 'stop-post' task: %m");
1794 service_enter_signal(s, SERVICE_FINAL_SIGTERM, SERVICE_FAILURE_RESOURCES);
1795 }
1796
1797 static int state_to_kill_operation(ServiceState state) {
1798 switch (state) {
1799
1800 case SERVICE_STOP_WATCHDOG:
1801 return KILL_WATCHDOG;
1802
1803 case SERVICE_STOP_SIGTERM:
1804 case SERVICE_FINAL_SIGTERM:
1805 return KILL_TERMINATE;
1806
1807 case SERVICE_STOP_SIGKILL:
1808 case SERVICE_FINAL_SIGKILL:
1809 return KILL_KILL;
1810
1811 default:
1812 return _KILL_OPERATION_INVALID;
1813 }
1814 }
1815
1816 static void service_enter_signal(Service *s, ServiceState state, ServiceResult f) {
1817 int r;
1818
1819 assert(s);
1820
1821 if (s->result == SERVICE_SUCCESS)
1822 s->result = f;
1823
1824 /* Before sending any signal, make sure we track all members of this cgroup */
1825 (void) unit_watch_all_pids(UNIT(s));
1826
1827 /* Also, enqueue a job that we recheck all our PIDs a bit later, given that it's likely some processes have
1828 * died now */
1829 (void) unit_enqueue_rewatch_pids(UNIT(s));
1830
1831 r = unit_kill_context(
1832 UNIT(s),
1833 &s->kill_context,
1834 state_to_kill_operation(state),
1835 s->main_pid,
1836 s->control_pid,
1837 s->main_pid_alien);
1838 if (r < 0)
1839 goto fail;
1840
1841 if (r > 0) {
1842 r = service_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_stop_usec));
1843 if (r < 0)
1844 goto fail;
1845
1846 service_set_state(s, state);
1847 } else if (IN_SET(state, SERVICE_STOP_WATCHDOG, SERVICE_STOP_SIGTERM) && s->kill_context.send_sigkill)
1848 service_enter_signal(s, SERVICE_STOP_SIGKILL, SERVICE_SUCCESS);
1849 else if (IN_SET(state, SERVICE_STOP_WATCHDOG, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL))
1850 service_enter_stop_post(s, SERVICE_SUCCESS);
1851 else if (state == SERVICE_FINAL_SIGTERM && s->kill_context.send_sigkill)
1852 service_enter_signal(s, SERVICE_FINAL_SIGKILL, SERVICE_SUCCESS);
1853 else
1854 service_enter_dead(s, SERVICE_SUCCESS, true);
1855
1856 return;
1857
1858 fail:
1859 log_unit_warning_errno(UNIT(s), r, "Failed to kill processes: %m");
1860
1861 if (IN_SET(state, SERVICE_STOP_WATCHDOG, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL))
1862 service_enter_stop_post(s, SERVICE_FAILURE_RESOURCES);
1863 else
1864 service_enter_dead(s, SERVICE_FAILURE_RESOURCES, true);
1865 }
1866
1867 static void service_enter_stop_by_notify(Service *s) {
1868 assert(s);
1869
1870 (void) unit_enqueue_rewatch_pids(UNIT(s));
1871
1872 service_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_stop_usec));
1873
1874 /* The service told us it's stopping, so it's as if we SIGTERM'd it. */
1875 service_set_state(s, SERVICE_STOP_SIGTERM);
1876 }
1877
1878 static void service_enter_stop(Service *s, ServiceResult f) {
1879 int r;
1880
1881 assert(s);
1882
1883 if (s->result == SERVICE_SUCCESS)
1884 s->result = f;
1885
1886 service_unwatch_control_pid(s);
1887 (void) unit_enqueue_rewatch_pids(UNIT(s));
1888
1889 s->control_command = s->exec_command[SERVICE_EXEC_STOP];
1890 if (s->control_command) {
1891 s->control_command_id = SERVICE_EXEC_STOP;
1892
1893 r = service_spawn(s,
1894 s->control_command,
1895 s->timeout_stop_usec,
1896 EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_IS_CONTROL|EXEC_SETENV_RESULT|EXEC_CONTROL_CGROUP,
1897 &s->control_pid);
1898 if (r < 0)
1899 goto fail;
1900
1901 service_set_state(s, SERVICE_STOP);
1902 } else
1903 service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_SUCCESS);
1904
1905 return;
1906
1907 fail:
1908 log_unit_warning_errno(UNIT(s), r, "Failed to run 'stop' task: %m");
1909 service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_FAILURE_RESOURCES);
1910 }
1911
1912 static bool service_good(Service *s) {
1913 int main_pid_ok;
1914 assert(s);
1915
1916 if (s->type == SERVICE_DBUS && !s->bus_name_good)
1917 return false;
1918
1919 main_pid_ok = main_pid_good(s);
1920 if (main_pid_ok > 0) /* It's alive */
1921 return true;
1922 if (main_pid_ok == 0) /* It's dead */
1923 return false;
1924
1925 /* OK, we don't know anything about the main PID, maybe
1926 * because there is none. Let's check the control group
1927 * instead. */
1928
1929 return cgroup_good(s) != 0;
1930 }
1931
1932 static void service_enter_running(Service *s, ServiceResult f) {
1933 assert(s);
1934
1935 if (s->result == SERVICE_SUCCESS)
1936 s->result = f;
1937
1938 service_unwatch_control_pid(s);
1939
1940 if (s->result != SERVICE_SUCCESS)
1941 service_enter_signal(s, SERVICE_STOP_SIGTERM, f);
1942 else if (service_good(s)) {
1943
1944 /* If there are any queued up sd_notify() notifications, process them now */
1945 if (s->notify_state == NOTIFY_RELOADING)
1946 service_enter_reload_by_notify(s);
1947 else if (s->notify_state == NOTIFY_STOPPING)
1948 service_enter_stop_by_notify(s);
1949 else {
1950 service_set_state(s, SERVICE_RUNNING);
1951 service_arm_timer(s, usec_add(UNIT(s)->active_enter_timestamp.monotonic, s->runtime_max_usec));
1952 }
1953
1954 } else if (s->remain_after_exit)
1955 service_set_state(s, SERVICE_EXITED);
1956 else
1957 service_enter_stop(s, SERVICE_SUCCESS);
1958 }
1959
1960 static void service_enter_start_post(Service *s) {
1961 int r;
1962 assert(s);
1963
1964 service_unwatch_control_pid(s);
1965 service_reset_watchdog(s);
1966
1967 s->control_command = s->exec_command[SERVICE_EXEC_START_POST];
1968 if (s->control_command) {
1969 s->control_command_id = SERVICE_EXEC_START_POST;
1970
1971 r = service_spawn(s,
1972 s->control_command,
1973 s->timeout_start_usec,
1974 EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_IS_CONTROL|EXEC_CONTROL_CGROUP,
1975 &s->control_pid);
1976 if (r < 0)
1977 goto fail;
1978
1979 service_set_state(s, SERVICE_START_POST);
1980 } else
1981 service_enter_running(s, SERVICE_SUCCESS);
1982
1983 return;
1984
1985 fail:
1986 log_unit_warning_errno(UNIT(s), r, "Failed to run 'start-post' task: %m");
1987 service_enter_stop(s, SERVICE_FAILURE_RESOURCES);
1988 }
1989
1990 static void service_kill_control_process(Service *s) {
1991 int r;
1992
1993 assert(s);
1994
1995 if (s->control_pid <= 0)
1996 return;
1997
1998 r = kill_and_sigcont(s->control_pid, SIGKILL);
1999 if (r < 0) {
2000 _cleanup_free_ char *comm = NULL;
2001
2002 (void) get_process_comm(s->control_pid, &comm);
2003
2004 log_unit_debug_errno(UNIT(s), r, "Failed to kill control process " PID_FMT " (%s), ignoring: %m",
2005 s->control_pid, strna(comm));
2006 }
2007 }
2008
2009 static int service_adverse_to_leftover_processes(Service *s) {
2010 assert(s);
2011
2012 /* KillMode=mixed and control group are used to indicate that all process should be killed off.
2013 * SendSIGKILL is used for services that require a clean shutdown. These are typically database
2014 * service where a SigKilled process would result in a lengthy recovery and who's shutdown or
2015 * startup time is quite variable (so Timeout settings aren't of use).
2016 *
2017 * Here we take these two factors and refuse to start a service if there are existing processes
2018 * within a control group. Databases, while generally having some protection against multiple
2019 * instances running, lets not stress the rigor of these. Also ExecStartPre parts of the service
2020 * aren't as rigoriously written to protect aganst against multiple use. */
2021 if (unit_warn_leftover_processes(UNIT(s)) &&
2022 IN_SET(s->kill_context.kill_mode, KILL_MIXED, KILL_CONTROL_GROUP) &&
2023 !s->kill_context.send_sigkill) {
2024 return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(EBUSY), "Will not start SendSIGKILL=no service of type KillMode=control-group or mixed while processes exist");
2025 }
2026 return 0;
2027 }
2028
2029 static void service_enter_start(Service *s) {
2030 ExecCommand *c;
2031 usec_t timeout;
2032 pid_t pid;
2033 int r;
2034
2035 assert(s);
2036
2037 service_unwatch_control_pid(s);
2038 service_unwatch_main_pid(s);
2039
2040 r = service_adverse_to_leftover_processes(s);
2041 if (r < 0)
2042 goto fail;
2043
2044 if (s->type == SERVICE_FORKING) {
2045 s->control_command_id = SERVICE_EXEC_START;
2046 c = s->control_command = s->exec_command[SERVICE_EXEC_START];
2047
2048 s->main_command = NULL;
2049 } else {
2050 s->control_command_id = _SERVICE_EXEC_COMMAND_INVALID;
2051 s->control_command = NULL;
2052
2053 c = s->main_command = s->exec_command[SERVICE_EXEC_START];
2054 }
2055
2056 if (!c) {
2057 if (s->type != SERVICE_ONESHOT) {
2058 /* There's no command line configured for the main command? Hmm, that is strange. This can only
2059 * happen if the configuration changes at runtime. In this case, let's enter a failure
2060 * state. */
2061 log_unit_error(UNIT(s), "There's no 'start' task anymore we could start.");
2062 r = -ENXIO;
2063 goto fail;
2064 }
2065
2066 /* We force a fake state transition here. Otherwise, the unit would go directly from
2067 * SERVICE_DEAD to SERVICE_DEAD without SERVICE_ACTIVATING or SERVICE_ACTIVE
2068 * inbetween. This way we can later trigger actions that depend on the state
2069 * transition, including SuccessAction=. */
2070 service_set_state(s, SERVICE_START);
2071
2072 service_enter_start_post(s);
2073 return;
2074 }
2075
2076 if (IN_SET(s->type, SERVICE_SIMPLE, SERVICE_IDLE))
2077 /* For simple + idle this is the main process. We don't apply any timeout here, but
2078 * service_enter_running() will later apply the .runtime_max_usec timeout. */
2079 timeout = USEC_INFINITY;
2080 else
2081 timeout = s->timeout_start_usec;
2082
2083 r = service_spawn(s,
2084 c,
2085 timeout,
2086 EXEC_PASS_FDS|EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN|EXEC_SET_WATCHDOG,
2087 &pid);
2088 if (r < 0)
2089 goto fail;
2090
2091 if (IN_SET(s->type, SERVICE_SIMPLE, SERVICE_IDLE)) {
2092 /* For simple services we immediately start
2093 * the START_POST binaries. */
2094
2095 service_set_main_pid(s, pid);
2096 service_enter_start_post(s);
2097
2098 } else if (s->type == SERVICE_FORKING) {
2099
2100 /* For forking services we wait until the start
2101 * process exited. */
2102
2103 s->control_pid = pid;
2104 service_set_state(s, SERVICE_START);
2105
2106 } else if (IN_SET(s->type, SERVICE_ONESHOT, SERVICE_DBUS, SERVICE_NOTIFY, SERVICE_EXEC)) {
2107
2108 /* For oneshot services we wait until the start process exited, too, but it is our main process. */
2109
2110 /* For D-Bus services we know the main pid right away, but wait for the bus name to appear on the
2111 * bus. 'notify' and 'exec' services are similar. */
2112
2113 service_set_main_pid(s, pid);
2114 service_set_state(s, SERVICE_START);
2115 } else
2116 assert_not_reached("Unknown service type");
2117
2118 return;
2119
2120 fail:
2121 log_unit_warning_errno(UNIT(s), r, "Failed to run 'start' task: %m");
2122 service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_FAILURE_RESOURCES);
2123 }
2124
2125 static void service_enter_start_pre(Service *s) {
2126 int r;
2127
2128 assert(s);
2129
2130 service_unwatch_control_pid(s);
2131
2132 s->control_command = s->exec_command[SERVICE_EXEC_START_PRE];
2133 if (s->control_command) {
2134
2135 r = service_adverse_to_leftover_processes(s);
2136 if (r < 0)
2137 goto fail;
2138
2139 s->control_command_id = SERVICE_EXEC_START_PRE;
2140
2141 r = service_spawn(s,
2142 s->control_command,
2143 s->timeout_start_usec,
2144 EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_IS_CONTROL|EXEC_APPLY_TTY_STDIN,
2145 &s->control_pid);
2146 if (r < 0)
2147 goto fail;
2148
2149 service_set_state(s, SERVICE_START_PRE);
2150 } else
2151 service_enter_start(s);
2152
2153 return;
2154
2155 fail:
2156 log_unit_warning_errno(UNIT(s), r, "Failed to run 'start-pre' task: %m");
2157 service_enter_dead(s, SERVICE_FAILURE_RESOURCES, true);
2158 }
2159
2160 static void service_enter_restart(Service *s) {
2161 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
2162 int r;
2163
2164 assert(s);
2165
2166 if (UNIT(s)->job && UNIT(s)->job->type == JOB_STOP) {
2167 /* Don't restart things if we are going down anyway */
2168 log_unit_info(UNIT(s), "Stop job pending for unit, delaying automatic restart.");
2169
2170 r = service_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->restart_usec));
2171 if (r < 0)
2172 goto fail;
2173
2174 return;
2175 }
2176
2177 /* Any units that are bound to this service must also be
2178 * restarted. We use JOB_RESTART (instead of the more obvious
2179 * JOB_START) here so that those dependency jobs will be added
2180 * as well. */
2181 r = manager_add_job(UNIT(s)->manager, JOB_RESTART, UNIT(s), JOB_REPLACE, &error, NULL);
2182 if (r < 0)
2183 goto fail;
2184
2185 /* Count the jobs we enqueue for restarting. This counter is maintained as long as the unit isn't fully
2186 * stopped, i.e. as long as it remains up or remains in auto-start states. The use can reset the counter
2187 * explicitly however via the usual "systemctl reset-failure" logic. */
2188 s->n_restarts ++;
2189 s->flush_n_restarts = false;
2190
2191 log_struct(LOG_INFO,
2192 "MESSAGE_ID=" SD_MESSAGE_UNIT_RESTART_SCHEDULED_STR,
2193 LOG_UNIT_ID(UNIT(s)),
2194 LOG_UNIT_INVOCATION_ID(UNIT(s)),
2195 LOG_UNIT_MESSAGE(UNIT(s), "Scheduled restart job, restart counter is at %u.", s->n_restarts),
2196 "N_RESTARTS=%u", s->n_restarts);
2197
2198 /* Notify clients about changed restart counter */
2199 unit_add_to_dbus_queue(UNIT(s));
2200
2201 /* Note that we stay in the SERVICE_AUTO_RESTART state here,
2202 * it will be canceled as part of the service_stop() call that
2203 * is executed as part of JOB_RESTART. */
2204
2205 return;
2206
2207 fail:
2208 log_unit_warning(UNIT(s), "Failed to schedule restart job: %s", bus_error_message(&error, -r));
2209 service_enter_dead(s, SERVICE_FAILURE_RESOURCES, false);
2210 }
2211
2212 static void service_enter_reload_by_notify(Service *s) {
2213 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
2214 int r;
2215
2216 assert(s);
2217
2218 service_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_start_usec));
2219 service_set_state(s, SERVICE_RELOAD);
2220
2221 /* service_enter_reload_by_notify is never called during a reload, thus no loops are possible. */
2222 r = manager_propagate_reload(UNIT(s)->manager, UNIT(s), JOB_FAIL, &error);
2223 if (r < 0)
2224 log_unit_warning(UNIT(s), "Failed to schedule propagation of reload: %s", bus_error_message(&error, -r));
2225 }
2226
2227 static void service_enter_reload(Service *s) {
2228 int r;
2229
2230 assert(s);
2231
2232 service_unwatch_control_pid(s);
2233 s->reload_result = SERVICE_SUCCESS;
2234
2235 s->control_command = s->exec_command[SERVICE_EXEC_RELOAD];
2236 if (s->control_command) {
2237 s->control_command_id = SERVICE_EXEC_RELOAD;
2238
2239 r = service_spawn(s,
2240 s->control_command,
2241 s->timeout_start_usec,
2242 EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_IS_CONTROL|EXEC_CONTROL_CGROUP,
2243 &s->control_pid);
2244 if (r < 0)
2245 goto fail;
2246
2247 service_set_state(s, SERVICE_RELOAD);
2248 } else
2249 service_enter_running(s, SERVICE_SUCCESS);
2250
2251 return;
2252
2253 fail:
2254 log_unit_warning_errno(UNIT(s), r, "Failed to run 'reload' task: %m");
2255 s->reload_result = SERVICE_FAILURE_RESOURCES;
2256 service_enter_running(s, SERVICE_SUCCESS);
2257 }
2258
2259 static void service_run_next_control(Service *s) {
2260 usec_t timeout;
2261 int r;
2262
2263 assert(s);
2264 assert(s->control_command);
2265 assert(s->control_command->command_next);
2266
2267 assert(s->control_command_id != SERVICE_EXEC_START);
2268
2269 s->control_command = s->control_command->command_next;
2270 service_unwatch_control_pid(s);
2271
2272 if (IN_SET(s->state, SERVICE_START_PRE, SERVICE_START, SERVICE_START_POST, SERVICE_RUNNING, SERVICE_RELOAD))
2273 timeout = s->timeout_start_usec;
2274 else
2275 timeout = s->timeout_stop_usec;
2276
2277 r = service_spawn(s,
2278 s->control_command,
2279 timeout,
2280 EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_IS_CONTROL|
2281 (IN_SET(s->control_command_id, SERVICE_EXEC_START_PRE, SERVICE_EXEC_STOP_POST) ? EXEC_APPLY_TTY_STDIN : 0)|
2282 (IN_SET(s->control_command_id, SERVICE_EXEC_STOP, SERVICE_EXEC_STOP_POST) ? EXEC_SETENV_RESULT : 0)|
2283 (IN_SET(s->control_command_id, SERVICE_EXEC_START_POST, SERVICE_EXEC_RELOAD, SERVICE_EXEC_STOP, SERVICE_EXEC_STOP_POST) ? EXEC_CONTROL_CGROUP : 0),
2284 &s->control_pid);
2285 if (r < 0)
2286 goto fail;
2287
2288 return;
2289
2290 fail:
2291 log_unit_warning_errno(UNIT(s), r, "Failed to run next control task: %m");
2292
2293 if (IN_SET(s->state, SERVICE_START_PRE, SERVICE_START_POST, SERVICE_STOP))
2294 service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_FAILURE_RESOURCES);
2295 else if (s->state == SERVICE_STOP_POST)
2296 service_enter_dead(s, SERVICE_FAILURE_RESOURCES, true);
2297 else if (s->state == SERVICE_RELOAD) {
2298 s->reload_result = SERVICE_FAILURE_RESOURCES;
2299 service_enter_running(s, SERVICE_SUCCESS);
2300 } else
2301 service_enter_stop(s, SERVICE_FAILURE_RESOURCES);
2302 }
2303
2304 static void service_run_next_main(Service *s) {
2305 pid_t pid;
2306 int r;
2307
2308 assert(s);
2309 assert(s->main_command);
2310 assert(s->main_command->command_next);
2311 assert(s->type == SERVICE_ONESHOT);
2312
2313 s->main_command = s->main_command->command_next;
2314 service_unwatch_main_pid(s);
2315
2316 r = service_spawn(s,
2317 s->main_command,
2318 s->timeout_start_usec,
2319 EXEC_PASS_FDS|EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN|EXEC_SET_WATCHDOG,
2320 &pid);
2321 if (r < 0)
2322 goto fail;
2323
2324 service_set_main_pid(s, pid);
2325
2326 return;
2327
2328 fail:
2329 log_unit_warning_errno(UNIT(s), r, "Failed to run next main task: %m");
2330 service_enter_stop(s, SERVICE_FAILURE_RESOURCES);
2331 }
2332
2333 static int service_start(Unit *u) {
2334 Service *s = SERVICE(u);
2335 int r;
2336
2337 assert(s);
2338
2339 /* We cannot fulfill this request right now, try again later
2340 * please! */
2341 if (IN_SET(s->state,
2342 SERVICE_STOP, SERVICE_STOP_WATCHDOG, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL, SERVICE_STOP_POST,
2343 SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL))
2344 return -EAGAIN;
2345
2346 /* Already on it! */
2347 if (IN_SET(s->state, SERVICE_START_PRE, SERVICE_START, SERVICE_START_POST))
2348 return 0;
2349
2350 /* A service that will be restarted must be stopped first to
2351 * trigger BindsTo and/or OnFailure dependencies. If a user
2352 * does not want to wait for the holdoff time to elapse, the
2353 * service should be manually restarted, not started. We
2354 * simply return EAGAIN here, so that any start jobs stay
2355 * queued, and assume that the auto restart timer will
2356 * eventually trigger the restart. */
2357 if (s->state == SERVICE_AUTO_RESTART)
2358 return -EAGAIN;
2359
2360 assert(IN_SET(s->state, SERVICE_DEAD, SERVICE_FAILED));
2361
2362 /* Make sure we don't enter a busy loop of some kind. */
2363 r = unit_test_start_limit(u);
2364 if (r < 0) {
2365 service_enter_dead(s, SERVICE_FAILURE_START_LIMIT_HIT, false);
2366 return r;
2367 }
2368
2369 r = unit_acquire_invocation_id(u);
2370 if (r < 0)
2371 return r;
2372
2373 s->result = SERVICE_SUCCESS;
2374 s->reload_result = SERVICE_SUCCESS;
2375 s->main_pid_known = false;
2376 s->main_pid_alien = false;
2377 s->forbid_restart = false;
2378
2379 s->status_text = mfree(s->status_text);
2380 s->status_errno = 0;
2381
2382 s->notify_state = NOTIFY_UNKNOWN;
2383
2384 s->watchdog_original_usec = s->watchdog_usec;
2385 s->watchdog_override_enable = false;
2386 s->watchdog_override_usec = USEC_INFINITY;
2387
2388 exec_command_reset_status_list_array(s->exec_command, _SERVICE_EXEC_COMMAND_MAX);
2389 exec_status_reset(&s->main_exec_status);
2390
2391 /* This is not an automatic restart? Flush the restart counter then */
2392 if (s->flush_n_restarts) {
2393 s->n_restarts = 0;
2394 s->flush_n_restarts = false;
2395 }
2396
2397 u->reset_accounting = true;
2398
2399 service_enter_start_pre(s);
2400 return 1;
2401 }
2402
2403 static int service_stop(Unit *u) {
2404 Service *s = SERVICE(u);
2405
2406 assert(s);
2407
2408 /* Don't create restart jobs from manual stops. */
2409 s->forbid_restart = true;
2410
2411 /* Already on it */
2412 if (IN_SET(s->state,
2413 SERVICE_STOP, SERVICE_STOP_WATCHDOG, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL, SERVICE_STOP_POST,
2414 SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL))
2415 return 0;
2416
2417 /* A restart will be scheduled or is in progress. */
2418 if (s->state == SERVICE_AUTO_RESTART) {
2419 service_set_state(s, SERVICE_DEAD);
2420 return 0;
2421 }
2422
2423 /* If there's already something running we go directly into
2424 * kill mode. */
2425 if (IN_SET(s->state, SERVICE_START_PRE, SERVICE_START, SERVICE_START_POST, SERVICE_RELOAD)) {
2426 service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_SUCCESS);
2427 return 0;
2428 }
2429
2430 assert(IN_SET(s->state, SERVICE_RUNNING, SERVICE_EXITED));
2431
2432 service_enter_stop(s, SERVICE_SUCCESS);
2433 return 1;
2434 }
2435
2436 static int service_reload(Unit *u) {
2437 Service *s = SERVICE(u);
2438
2439 assert(s);
2440
2441 assert(IN_SET(s->state, SERVICE_RUNNING, SERVICE_EXITED));
2442
2443 service_enter_reload(s);
2444 return 1;
2445 }
2446
2447 _pure_ static bool service_can_reload(Unit *u) {
2448 Service *s = SERVICE(u);
2449
2450 assert(s);
2451
2452 return !!s->exec_command[SERVICE_EXEC_RELOAD];
2453 }
2454
2455 static unsigned service_exec_command_index(Unit *u, ServiceExecCommand id, ExecCommand *current) {
2456 Service *s = SERVICE(u);
2457 unsigned idx = 0;
2458 ExecCommand *first, *c;
2459
2460 assert(s);
2461
2462 first = s->exec_command[id];
2463
2464 /* Figure out where we are in the list by walking back to the beginning */
2465 for (c = current; c != first; c = c->command_prev)
2466 idx++;
2467
2468 return idx;
2469 }
2470
2471 static int service_serialize_exec_command(Unit *u, FILE *f, ExecCommand *command) {
2472 _cleanup_free_ char *args = NULL, *p = NULL;
2473 size_t allocated = 0, length = 0;
2474 Service *s = SERVICE(u);
2475 const char *type, *key;
2476 ServiceExecCommand id;
2477 unsigned idx;
2478 char **arg;
2479
2480 assert(s);
2481 assert(f);
2482
2483 if (!command)
2484 return 0;
2485
2486 if (command == s->control_command) {
2487 type = "control";
2488 id = s->control_command_id;
2489 } else {
2490 type = "main";
2491 id = SERVICE_EXEC_START;
2492 }
2493
2494 idx = service_exec_command_index(u, id, command);
2495
2496 STRV_FOREACH(arg, command->argv) {
2497 _cleanup_free_ char *e = NULL;
2498 size_t n;
2499
2500 e = cescape(*arg);
2501 if (!e)
2502 return log_oom();
2503
2504 n = strlen(e);
2505 if (!GREEDY_REALLOC(args, allocated, length + 1 + n + 1))
2506 return log_oom();
2507
2508 if (length > 0)
2509 args[length++] = ' ';
2510
2511 memcpy(args + length, e, n);
2512 length += n;
2513 }
2514
2515 if (!GREEDY_REALLOC(args, allocated, length + 1))
2516 return log_oom();
2517
2518 args[length++] = 0;
2519
2520 p = cescape(command->path);
2521 if (!p)
2522 return -ENOMEM;
2523
2524 key = strjoina(type, "-command");
2525 return serialize_item_format(f, key, "%s %u %s %s", service_exec_command_to_string(id), idx, p, args);
2526 }
2527
2528 static int service_serialize(Unit *u, FILE *f, FDSet *fds) {
2529 Service *s = SERVICE(u);
2530 ServiceFDStore *fs;
2531 int r;
2532
2533 assert(u);
2534 assert(f);
2535 assert(fds);
2536
2537 (void) serialize_item(f, "state", service_state_to_string(s->state));
2538 (void) serialize_item(f, "result", service_result_to_string(s->result));
2539 (void) serialize_item(f, "reload-result", service_result_to_string(s->reload_result));
2540
2541 if (s->control_pid > 0)
2542 (void) serialize_item_format(f, "control-pid", PID_FMT, s->control_pid);
2543
2544 if (s->main_pid_known && s->main_pid > 0)
2545 (void) serialize_item_format(f, "main-pid", PID_FMT, s->main_pid);
2546
2547 (void) serialize_bool(f, "main-pid-known", s->main_pid_known);
2548 (void) serialize_bool(f, "bus-name-good", s->bus_name_good);
2549 (void) serialize_bool(f, "bus-name-owner", s->bus_name_owner);
2550
2551 (void) serialize_item_format(f, "n-restarts", "%u", s->n_restarts);
2552 (void) serialize_bool(f, "flush-n-restarts", s->flush_n_restarts);
2553
2554 r = serialize_item_escaped(f, "status-text", s->status_text);
2555 if (r < 0)
2556 return r;
2557
2558 service_serialize_exec_command(u, f, s->control_command);
2559 service_serialize_exec_command(u, f, s->main_command);
2560
2561 r = serialize_fd(f, fds, "stdin-fd", s->stdin_fd);
2562 if (r < 0)
2563 return r;
2564 r = serialize_fd(f, fds, "stdout-fd", s->stdout_fd);
2565 if (r < 0)
2566 return r;
2567 r = serialize_fd(f, fds, "stderr-fd", s->stderr_fd);
2568 if (r < 0)
2569 return r;
2570
2571 if (s->exec_fd_event_source) {
2572 r = serialize_fd(f, fds, "exec-fd", sd_event_source_get_io_fd(s->exec_fd_event_source));
2573 if (r < 0)
2574 return r;
2575
2576 (void) serialize_bool(f, "exec-fd-hot", s->exec_fd_hot);
2577 }
2578
2579 if (UNIT_ISSET(s->accept_socket)) {
2580 r = serialize_item(f, "accept-socket", UNIT_DEREF(s->accept_socket)->id);
2581 if (r < 0)
2582 return r;
2583 }
2584
2585 r = serialize_fd(f, fds, "socket-fd", s->socket_fd);
2586 if (r < 0)
2587 return r;
2588
2589 LIST_FOREACH(fd_store, fs, s->fd_store) {
2590 _cleanup_free_ char *c = NULL;
2591 int copy;
2592
2593 copy = fdset_put_dup(fds, fs->fd);
2594 if (copy < 0)
2595 return log_error_errno(copy, "Failed to copy file descriptor for serialization: %m");
2596
2597 c = cescape(fs->fdname);
2598 if (!c)
2599 return log_oom();
2600
2601 (void) serialize_item_format(f, "fd-store-fd", "%i %s", copy, c);
2602 }
2603
2604 if (s->main_exec_status.pid > 0) {
2605 (void) serialize_item_format(f, "main-exec-status-pid", PID_FMT, s->main_exec_status.pid);
2606 (void) serialize_dual_timestamp(f, "main-exec-status-start", &s->main_exec_status.start_timestamp);
2607 (void) serialize_dual_timestamp(f, "main-exec-status-exit", &s->main_exec_status.exit_timestamp);
2608
2609 if (dual_timestamp_is_set(&s->main_exec_status.exit_timestamp)) {
2610 (void) serialize_item_format(f, "main-exec-status-code", "%i", s->main_exec_status.code);
2611 (void) serialize_item_format(f, "main-exec-status-status", "%i", s->main_exec_status.status);
2612 }
2613 }
2614
2615 (void) serialize_dual_timestamp(f, "watchdog-timestamp", &s->watchdog_timestamp);
2616 (void) serialize_bool(f, "forbid-restart", s->forbid_restart);
2617
2618 if (s->watchdog_override_enable)
2619 (void) serialize_item_format(f, "watchdog-override-usec", USEC_FMT, s->watchdog_override_usec);
2620
2621 if (s->watchdog_original_usec != USEC_INFINITY)
2622 (void) serialize_item_format(f, "watchdog-original-usec", USEC_FMT, s->watchdog_original_usec);
2623
2624 return 0;
2625 }
2626
2627 static int service_deserialize_exec_command(Unit *u, const char *key, const char *value) {
2628 Service *s = SERVICE(u);
2629 int r;
2630 unsigned idx = 0, i;
2631 bool control, found = false;
2632 ServiceExecCommand id = _SERVICE_EXEC_COMMAND_INVALID;
2633 ExecCommand *command = NULL;
2634 _cleanup_free_ char *path = NULL;
2635 _cleanup_strv_free_ char **argv = NULL;
2636
2637 enum ExecCommandState {
2638 STATE_EXEC_COMMAND_TYPE,
2639 STATE_EXEC_COMMAND_INDEX,
2640 STATE_EXEC_COMMAND_PATH,
2641 STATE_EXEC_COMMAND_ARGS,
2642 _STATE_EXEC_COMMAND_MAX,
2643 _STATE_EXEC_COMMAND_INVALID = -1,
2644 } state;
2645
2646 assert(s);
2647 assert(key);
2648 assert(value);
2649
2650 control = streq(key, "control-command");
2651
2652 state = STATE_EXEC_COMMAND_TYPE;
2653
2654 for (;;) {
2655 _cleanup_free_ char *arg = NULL;
2656
2657 r = extract_first_word(&value, &arg, NULL, EXTRACT_CUNESCAPE);
2658 if (r < 0)
2659 return r;
2660 if (r == 0)
2661 break;
2662
2663 switch (state) {
2664 case STATE_EXEC_COMMAND_TYPE:
2665 id = service_exec_command_from_string(arg);
2666 if (id < 0)
2667 return -EINVAL;
2668
2669 state = STATE_EXEC_COMMAND_INDEX;
2670 break;
2671 case STATE_EXEC_COMMAND_INDEX:
2672 r = safe_atou(arg, &idx);
2673 if (r < 0)
2674 return -EINVAL;
2675
2676 state = STATE_EXEC_COMMAND_PATH;
2677 break;
2678 case STATE_EXEC_COMMAND_PATH:
2679 path = TAKE_PTR(arg);
2680 state = STATE_EXEC_COMMAND_ARGS;
2681
2682 if (!path_is_absolute(path))
2683 return -EINVAL;
2684 break;
2685 case STATE_EXEC_COMMAND_ARGS:
2686 r = strv_extend(&argv, arg);
2687 if (r < 0)
2688 return -ENOMEM;
2689 break;
2690 default:
2691 assert_not_reached("Unknown error at deserialization of exec command");
2692 break;
2693 }
2694 }
2695
2696 if (state != STATE_EXEC_COMMAND_ARGS)
2697 return -EINVAL;
2698
2699 /* Let's check whether exec command on given offset matches data that we just deserialized */
2700 for (command = s->exec_command[id], i = 0; command; command = command->command_next, i++) {
2701 if (i != idx)
2702 continue;
2703
2704 found = strv_equal(argv, command->argv) && streq(command->path, path);
2705 break;
2706 }
2707
2708 if (!found) {
2709 /* Command at the index we serialized is different, let's look for command that exactly
2710 * matches but is on different index. If there is no such command we will not resume execution. */
2711 for (command = s->exec_command[id]; command; command = command->command_next)
2712 if (strv_equal(command->argv, argv) && streq(command->path, path))
2713 break;
2714 }
2715
2716 if (command && control)
2717 s->control_command = command;
2718 else if (command)
2719 s->main_command = command;
2720 else
2721 log_unit_warning(u, "Current command vanished from the unit file, execution of the command list won't be resumed.");
2722
2723 return 0;
2724 }
2725
2726 static int service_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
2727 Service *s = SERVICE(u);
2728 int r;
2729
2730 assert(u);
2731 assert(key);
2732 assert(value);
2733 assert(fds);
2734
2735 if (streq(key, "state")) {
2736 ServiceState state;
2737
2738 state = service_state_from_string(value);
2739 if (state < 0)
2740 log_unit_debug(u, "Failed to parse state value: %s", value);
2741 else
2742 s->deserialized_state = state;
2743 } else if (streq(key, "result")) {
2744 ServiceResult f;
2745
2746 f = service_result_from_string(value);
2747 if (f < 0)
2748 log_unit_debug(u, "Failed to parse result value: %s", value);
2749 else if (f != SERVICE_SUCCESS)
2750 s->result = f;
2751
2752 } else if (streq(key, "reload-result")) {
2753 ServiceResult f;
2754
2755 f = service_result_from_string(value);
2756 if (f < 0)
2757 log_unit_debug(u, "Failed to parse reload result value: %s", value);
2758 else if (f != SERVICE_SUCCESS)
2759 s->reload_result = f;
2760
2761 } else if (streq(key, "control-pid")) {
2762 pid_t pid;
2763
2764 if (parse_pid(value, &pid) < 0)
2765 log_unit_debug(u, "Failed to parse control-pid value: %s", value);
2766 else
2767 s->control_pid = pid;
2768 } else if (streq(key, "main-pid")) {
2769 pid_t pid;
2770
2771 if (parse_pid(value, &pid) < 0)
2772 log_unit_debug(u, "Failed to parse main-pid value: %s", value);
2773 else
2774 (void) service_set_main_pid(s, pid);
2775 } else if (streq(key, "main-pid-known")) {
2776 int b;
2777
2778 b = parse_boolean(value);
2779 if (b < 0)
2780 log_unit_debug(u, "Failed to parse main-pid-known value: %s", value);
2781 else
2782 s->main_pid_known = b;
2783 } else if (streq(key, "bus-name-good")) {
2784 int b;
2785
2786 b = parse_boolean(value);
2787 if (b < 0)
2788 log_unit_debug(u, "Failed to parse bus-name-good value: %s", value);
2789 else
2790 s->bus_name_good = b;
2791 } else if (streq(key, "bus-name-owner")) {
2792 r = free_and_strdup(&s->bus_name_owner, value);
2793 if (r < 0)
2794 log_unit_error_errno(u, r, "Unable to deserialize current bus owner %s: %m", value);
2795 } else if (streq(key, "status-text")) {
2796 char *t;
2797
2798 r = cunescape(value, 0, &t);
2799 if (r < 0)
2800 log_unit_debug_errno(u, r, "Failed to unescape status text '%s': %m", value);
2801 else
2802 free_and_replace(s->status_text, t);
2803
2804 } else if (streq(key, "accept-socket")) {
2805 Unit *socket;
2806
2807 r = manager_load_unit(u->manager, value, NULL, NULL, &socket);
2808 if (r < 0)
2809 log_unit_debug_errno(u, r, "Failed to load accept-socket unit '%s': %m", value);
2810 else {
2811 unit_ref_set(&s->accept_socket, u, socket);
2812 SOCKET(socket)->n_connections++;
2813 }
2814
2815 } else if (streq(key, "socket-fd")) {
2816 int fd;
2817
2818 if (safe_atoi(value, &fd) < 0 || fd < 0 || !fdset_contains(fds, fd))
2819 log_unit_debug(u, "Failed to parse socket-fd value: %s", value);
2820 else {
2821 asynchronous_close(s->socket_fd);
2822 s->socket_fd = fdset_remove(fds, fd);
2823 }
2824 } else if (streq(key, "fd-store-fd")) {
2825 const char *fdv;
2826 size_t pf;
2827 int fd;
2828
2829 pf = strcspn(value, WHITESPACE);
2830 fdv = strndupa(value, pf);
2831
2832 if (safe_atoi(fdv, &fd) < 0 || fd < 0 || !fdset_contains(fds, fd))
2833 log_unit_debug(u, "Failed to parse fd-store-fd value: %s", value);
2834 else {
2835 _cleanup_free_ char *t = NULL;
2836 const char *fdn;
2837
2838 fdn = value + pf;
2839 fdn += strspn(fdn, WHITESPACE);
2840 (void) cunescape(fdn, 0, &t);
2841
2842 r = service_add_fd_store(s, fd, t);
2843 if (r < 0)
2844 log_unit_error_errno(u, r, "Failed to add fd to store: %m");
2845 else
2846 fdset_remove(fds, fd);
2847 }
2848
2849 } else if (streq(key, "main-exec-status-pid")) {
2850 pid_t pid;
2851
2852 if (parse_pid(value, &pid) < 0)
2853 log_unit_debug(u, "Failed to parse main-exec-status-pid value: %s", value);
2854 else
2855 s->main_exec_status.pid = pid;
2856 } else if (streq(key, "main-exec-status-code")) {
2857 int i;
2858
2859 if (safe_atoi(value, &i) < 0)
2860 log_unit_debug(u, "Failed to parse main-exec-status-code value: %s", value);
2861 else
2862 s->main_exec_status.code = i;
2863 } else if (streq(key, "main-exec-status-status")) {
2864 int i;
2865
2866 if (safe_atoi(value, &i) < 0)
2867 log_unit_debug(u, "Failed to parse main-exec-status-status value: %s", value);
2868 else
2869 s->main_exec_status.status = i;
2870 } else if (streq(key, "main-exec-status-start"))
2871 deserialize_dual_timestamp(value, &s->main_exec_status.start_timestamp);
2872 else if (streq(key, "main-exec-status-exit"))
2873 deserialize_dual_timestamp(value, &s->main_exec_status.exit_timestamp);
2874 else if (streq(key, "watchdog-timestamp"))
2875 deserialize_dual_timestamp(value, &s->watchdog_timestamp);
2876 else if (streq(key, "forbid-restart")) {
2877 int b;
2878
2879 b = parse_boolean(value);
2880 if (b < 0)
2881 log_unit_debug(u, "Failed to parse forbid-restart value: %s", value);
2882 else
2883 s->forbid_restart = b;
2884 } else if (streq(key, "stdin-fd")) {
2885 int fd;
2886
2887 if (safe_atoi(value, &fd) < 0 || fd < 0 || !fdset_contains(fds, fd))
2888 log_unit_debug(u, "Failed to parse stdin-fd value: %s", value);
2889 else {
2890 asynchronous_close(s->stdin_fd);
2891 s->stdin_fd = fdset_remove(fds, fd);
2892 s->exec_context.stdio_as_fds = true;
2893 }
2894 } else if (streq(key, "stdout-fd")) {
2895 int fd;
2896
2897 if (safe_atoi(value, &fd) < 0 || fd < 0 || !fdset_contains(fds, fd))
2898 log_unit_debug(u, "Failed to parse stdout-fd value: %s", value);
2899 else {
2900 asynchronous_close(s->stdout_fd);
2901 s->stdout_fd = fdset_remove(fds, fd);
2902 s->exec_context.stdio_as_fds = true;
2903 }
2904 } else if (streq(key, "stderr-fd")) {
2905 int fd;
2906
2907 if (safe_atoi(value, &fd) < 0 || fd < 0 || !fdset_contains(fds, fd))
2908 log_unit_debug(u, "Failed to parse stderr-fd value: %s", value);
2909 else {
2910 asynchronous_close(s->stderr_fd);
2911 s->stderr_fd = fdset_remove(fds, fd);
2912 s->exec_context.stdio_as_fds = true;
2913 }
2914 } else if (streq(key, "exec-fd")) {
2915 int fd;
2916
2917 if (safe_atoi(value, &fd) < 0 || fd < 0 || !fdset_contains(fds, fd))
2918 log_unit_debug(u, "Failed to parse exec-fd value: %s", value);
2919 else {
2920 s->exec_fd_event_source = sd_event_source_unref(s->exec_fd_event_source);
2921
2922 fd = fdset_remove(fds, fd);
2923 if (service_allocate_exec_fd_event_source(s, fd, &s->exec_fd_event_source) < 0)
2924 safe_close(fd);
2925 }
2926 } else if (streq(key, "watchdog-override-usec")) {
2927 if (deserialize_usec(value, &s->watchdog_override_usec) < 0)
2928 log_unit_debug(u, "Failed to parse watchdog_override_usec value: %s", value);
2929 else
2930 s->watchdog_override_enable = true;
2931
2932 } else if (streq(key, "watchdog-original-usec")) {
2933 if (deserialize_usec(value, &s->watchdog_original_usec) < 0)
2934 log_unit_debug(u, "Failed to parse watchdog_original_usec value: %s", value);
2935
2936 } else if (STR_IN_SET(key, "main-command", "control-command")) {
2937 r = service_deserialize_exec_command(u, key, value);
2938 if (r < 0)
2939 log_unit_debug_errno(u, r, "Failed to parse serialized command \"%s\": %m", value);
2940
2941 } else if (streq(key, "n-restarts")) {
2942 r = safe_atou(value, &s->n_restarts);
2943 if (r < 0)
2944 log_unit_debug_errno(u, r, "Failed to parse serialized restart counter '%s': %m", value);
2945
2946 } else if (streq(key, "flush-n-restarts")) {
2947 r = parse_boolean(value);
2948 if (r < 0)
2949 log_unit_debug_errno(u, r, "Failed to parse serialized flush restart counter setting '%s': %m", value);
2950 else
2951 s->flush_n_restarts = r;
2952 } else
2953 log_unit_debug(u, "Unknown serialization key: %s", key);
2954
2955 return 0;
2956 }
2957
2958 _pure_ static UnitActiveState service_active_state(Unit *u) {
2959 const UnitActiveState *table;
2960
2961 assert(u);
2962
2963 table = SERVICE(u)->type == SERVICE_IDLE ? state_translation_table_idle : state_translation_table;
2964
2965 return table[SERVICE(u)->state];
2966 }
2967
2968 static const char *service_sub_state_to_string(Unit *u) {
2969 assert(u);
2970
2971 return service_state_to_string(SERVICE(u)->state);
2972 }
2973
2974 static bool service_may_gc(Unit *u) {
2975 Service *s = SERVICE(u);
2976
2977 assert(s);
2978
2979 /* Never clean up services that still have a process around, even if the service is formally dead. Note that
2980 * unit_may_gc() already checked our cgroup for us, we just check our two additional PIDs, too, in case they
2981 * have moved outside of the cgroup. */
2982
2983 if (main_pid_good(s) > 0 ||
2984 control_pid_good(s) > 0)
2985 return false;
2986
2987 return true;
2988 }
2989
2990 static int service_retry_pid_file(Service *s) {
2991 int r;
2992
2993 assert(s->pid_file);
2994 assert(IN_SET(s->state, SERVICE_START, SERVICE_START_POST));
2995
2996 r = service_load_pid_file(s, false);
2997 if (r < 0)
2998 return r;
2999
3000 service_unwatch_pid_file(s);
3001
3002 service_enter_running(s, SERVICE_SUCCESS);
3003 return 0;
3004 }
3005
3006 static int service_watch_pid_file(Service *s) {
3007 int r;
3008
3009 log_unit_debug(UNIT(s), "Setting watch for PID file %s", s->pid_file_pathspec->path);
3010
3011 r = path_spec_watch(s->pid_file_pathspec, service_dispatch_inotify_io);
3012 if (r < 0)
3013 goto fail;
3014
3015 /* the pidfile might have appeared just before we set the watch */
3016 log_unit_debug(UNIT(s), "Trying to read PID file %s in case it changed", s->pid_file_pathspec->path);
3017 service_retry_pid_file(s);
3018
3019 return 0;
3020 fail:
3021 log_unit_error_errno(UNIT(s), r, "Failed to set a watch for PID file %s: %m", s->pid_file_pathspec->path);
3022 service_unwatch_pid_file(s);
3023 return r;
3024 }
3025
3026 static int service_demand_pid_file(Service *s) {
3027 PathSpec *ps;
3028
3029 assert(s->pid_file);
3030 assert(!s->pid_file_pathspec);
3031
3032 ps = new0(PathSpec, 1);
3033 if (!ps)
3034 return -ENOMEM;
3035
3036 ps->unit = UNIT(s);
3037 ps->path = strdup(s->pid_file);
3038 if (!ps->path) {
3039 free(ps);
3040 return -ENOMEM;
3041 }
3042
3043 path_simplify(ps->path, false);
3044
3045 /* PATH_CHANGED would not be enough. There are daemons (sendmail) that
3046 * keep their PID file open all the time. */
3047 ps->type = PATH_MODIFIED;
3048 ps->inotify_fd = -1;
3049
3050 s->pid_file_pathspec = ps;
3051
3052 return service_watch_pid_file(s);
3053 }
3054
3055 static int service_dispatch_inotify_io(sd_event_source *source, int fd, uint32_t events, void *userdata) {
3056 PathSpec *p = userdata;
3057 Service *s;
3058
3059 assert(p);
3060
3061 s = SERVICE(p->unit);
3062
3063 assert(s);
3064 assert(fd >= 0);
3065 assert(IN_SET(s->state, SERVICE_START, SERVICE_START_POST));
3066 assert(s->pid_file_pathspec);
3067 assert(path_spec_owns_inotify_fd(s->pid_file_pathspec, fd));
3068
3069 log_unit_debug(UNIT(s), "inotify event");
3070
3071 if (path_spec_fd_event(p, events) < 0)
3072 goto fail;
3073
3074 if (service_retry_pid_file(s) == 0)
3075 return 0;
3076
3077 if (service_watch_pid_file(s) < 0)
3078 goto fail;
3079
3080 return 0;
3081
3082 fail:
3083 service_unwatch_pid_file(s);
3084 service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_FAILURE_RESOURCES);
3085 return 0;
3086 }
3087
3088 static int service_dispatch_exec_io(sd_event_source *source, int fd, uint32_t events, void *userdata) {
3089 Service *s = SERVICE(userdata);
3090
3091 assert(s);
3092
3093 log_unit_debug(UNIT(s), "got exec-fd event");
3094
3095 /* If Type=exec is set, we'll consider a service started successfully the instant we invoked execve()
3096 * successfully for it. We implement this through a pipe() towards the child, which the kernel automatically
3097 * closes for us due to O_CLOEXEC on execve() in the child, which then triggers EOF on the pipe in the
3098 * parent. We need to be careful however, as there are other reasons that we might cause the child's side of
3099 * the pipe to be closed (for example, a simple exit()). To deal with that we'll ignore EOFs on the pipe unless
3100 * the child signalled us first that it is about to call the execve(). It does so by sending us a simple
3101 * non-zero byte via the pipe. We also provide the child with a way to inform us in case execve() failed: if it
3102 * sends a zero byte we'll ignore POLLHUP on the fd again. */
3103
3104 for (;;) {
3105 uint8_t x;
3106 ssize_t n;
3107
3108 n = read(fd, &x, sizeof(x));
3109 if (n < 0) {
3110 if (errno == EAGAIN) /* O_NONBLOCK in effect → everything queued has now been processed. */
3111 return 0;
3112
3113 return log_unit_error_errno(UNIT(s), errno, "Failed to read from exec_fd: %m");
3114 }
3115 if (n == 0) { /* EOF → the event we are waiting for */
3116
3117 s->exec_fd_event_source = sd_event_source_unref(s->exec_fd_event_source);
3118
3119 if (s->exec_fd_hot) { /* Did the child tell us to expect EOF now? */
3120 log_unit_debug(UNIT(s), "Got EOF on exec-fd");
3121
3122 s->exec_fd_hot = false;
3123
3124 /* Nice! This is what we have been waiting for. Transition to next state. */
3125 if (s->type == SERVICE_EXEC && s->state == SERVICE_START)
3126 service_enter_start_post(s);
3127 } else
3128 log_unit_debug(UNIT(s), "Got EOF on exec-fd while it was disabled, ignoring.");
3129
3130 return 0;
3131 }
3132
3133 /* A byte was read → this turns on/off the exec fd logic */
3134 assert(n == sizeof(x));
3135 s->exec_fd_hot = x;
3136 }
3137
3138 return 0;
3139 }
3140
3141 static void service_notify_cgroup_empty_event(Unit *u) {
3142 Service *s = SERVICE(u);
3143
3144 assert(u);
3145
3146 log_unit_debug(u, "cgroup is empty");
3147
3148 switch (s->state) {
3149
3150 /* Waiting for SIGCHLD is usually more interesting,
3151 * because it includes return codes/signals. Which is
3152 * why we ignore the cgroup events for most cases,
3153 * except when we don't know pid which to expect the
3154 * SIGCHLD for. */
3155
3156 case SERVICE_START:
3157 if (s->type == SERVICE_NOTIFY &&
3158 main_pid_good(s) == 0 &&
3159 control_pid_good(s) == 0) {
3160 /* No chance of getting a ready notification anymore */
3161 service_enter_stop_post(s, SERVICE_FAILURE_PROTOCOL);
3162 break;
3163 }
3164
3165 _fallthrough_;
3166 case SERVICE_START_POST:
3167 if (s->pid_file_pathspec &&
3168 main_pid_good(s) == 0 &&
3169 control_pid_good(s) == 0) {
3170
3171 /* Give up hoping for the daemon to write its PID file */
3172 log_unit_warning(u, "Daemon never wrote its PID file. Failing.");
3173
3174 service_unwatch_pid_file(s);
3175 if (s->state == SERVICE_START)
3176 service_enter_stop_post(s, SERVICE_FAILURE_PROTOCOL);
3177 else
3178 service_enter_stop(s, SERVICE_FAILURE_PROTOCOL);
3179 }
3180 break;
3181
3182 case SERVICE_RUNNING:
3183 /* service_enter_running() will figure out what to do */
3184 service_enter_running(s, SERVICE_SUCCESS);
3185 break;
3186
3187 case SERVICE_STOP_WATCHDOG:
3188 case SERVICE_STOP_SIGTERM:
3189 case SERVICE_STOP_SIGKILL:
3190
3191 if (main_pid_good(s) <= 0 && control_pid_good(s) <= 0)
3192 service_enter_stop_post(s, SERVICE_SUCCESS);
3193
3194 break;
3195
3196 case SERVICE_STOP_POST:
3197 case SERVICE_FINAL_SIGTERM:
3198 case SERVICE_FINAL_SIGKILL:
3199 if (main_pid_good(s) <= 0 && control_pid_good(s) <= 0)
3200 service_enter_dead(s, SERVICE_SUCCESS, true);
3201
3202 break;
3203
3204 default:
3205 ;
3206 }
3207 }
3208
3209 static void service_sigchld_event(Unit *u, pid_t pid, int code, int status) {
3210 bool notify_dbus = true;
3211 Service *s = SERVICE(u);
3212 ServiceResult f;
3213 ExitClean clean_mode;
3214
3215 assert(s);
3216 assert(pid >= 0);
3217
3218 /* Oneshot services and non-SERVICE_EXEC_START commands should not be
3219 * considered daemons as they are typically not long running. */
3220 if (s->type == SERVICE_ONESHOT || (s->control_pid == pid && s->control_command_id != SERVICE_EXEC_START))
3221 clean_mode = EXIT_CLEAN_COMMAND;
3222 else
3223 clean_mode = EXIT_CLEAN_DAEMON;
3224
3225 if (is_clean_exit(code, status, clean_mode, &s->success_status))
3226 f = SERVICE_SUCCESS;
3227 else if (code == CLD_EXITED)
3228 f = SERVICE_FAILURE_EXIT_CODE;
3229 else if (code == CLD_KILLED)
3230 f = SERVICE_FAILURE_SIGNAL;
3231 else if (code == CLD_DUMPED)
3232 f = SERVICE_FAILURE_CORE_DUMP;
3233 else
3234 assert_not_reached("Unknown code");
3235
3236 if (s->main_pid == pid) {
3237 /* Forking services may occasionally move to a new PID.
3238 * As long as they update the PID file before exiting the old
3239 * PID, they're fine. */
3240 if (service_load_pid_file(s, false) > 0)
3241 return;
3242
3243 s->main_pid = 0;
3244 exec_status_exit(&s->main_exec_status, &s->exec_context, pid, code, status);
3245
3246 if (s->main_command) {
3247 /* If this is not a forking service than the
3248 * main process got started and hence we copy
3249 * the exit status so that it is recorded both
3250 * as main and as control process exit
3251 * status */
3252
3253 s->main_command->exec_status = s->main_exec_status;
3254
3255 if (s->main_command->flags & EXEC_COMMAND_IGNORE_FAILURE)
3256 f = SERVICE_SUCCESS;
3257 } else if (s->exec_command[SERVICE_EXEC_START]) {
3258
3259 /* If this is a forked process, then we should
3260 * ignore the return value if this was
3261 * configured for the starter process */
3262
3263 if (s->exec_command[SERVICE_EXEC_START]->flags & EXEC_COMMAND_IGNORE_FAILURE)
3264 f = SERVICE_SUCCESS;
3265 }
3266
3267 /* When this is a successful exit, let's log about the exit code on DEBUG level. If this is a failure
3268 * and the process exited on its own via exit(), then let's make this a NOTICE, under the assumption
3269 * that the service already logged the reason at a higher log level on its own. (Internally,
3270 * unit_log_process_exit() will possibly bump this to WARNING if the service died due to a signal.) */
3271 unit_log_process_exit(
3272 u, f == SERVICE_SUCCESS ? LOG_DEBUG : LOG_NOTICE,
3273 "Main process",
3274 service_exec_command_to_string(SERVICE_EXEC_START),
3275 code, status);
3276
3277 if (s->result == SERVICE_SUCCESS)
3278 s->result = f;
3279
3280 if (s->main_command &&
3281 s->main_command->command_next &&
3282 s->type == SERVICE_ONESHOT &&
3283 f == SERVICE_SUCCESS) {
3284
3285 /* There is another command to *
3286 * execute, so let's do that. */
3287
3288 log_unit_debug(u, "Running next main command for state %s.", service_state_to_string(s->state));
3289 service_run_next_main(s);
3290
3291 } else {
3292
3293 /* The service exited, so the service is officially
3294 * gone. */
3295 s->main_command = NULL;
3296
3297 switch (s->state) {
3298
3299 case SERVICE_START_POST:
3300 case SERVICE_RELOAD:
3301 case SERVICE_STOP:
3302 /* Need to wait until the operation is
3303 * done */
3304 break;
3305
3306 case SERVICE_START:
3307 if (s->type == SERVICE_ONESHOT) {
3308 /* This was our main goal, so let's go on */
3309 if (f == SERVICE_SUCCESS)
3310 service_enter_start_post(s);
3311 else
3312 service_enter_signal(s, SERVICE_STOP_SIGTERM, f);
3313 break;
3314 } else if (s->type == SERVICE_NOTIFY) {
3315 /* Only enter running through a notification, so that the
3316 * SERVICE_START state signifies that no ready notification
3317 * has been received */
3318 if (f != SERVICE_SUCCESS)
3319 service_enter_signal(s, SERVICE_STOP_SIGTERM, f);
3320 else if (!s->remain_after_exit || s->notify_access == NOTIFY_MAIN)
3321 /* The service has never been and will never be active */
3322 service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_FAILURE_PROTOCOL);
3323 break;
3324 }
3325
3326 _fallthrough_;
3327 case SERVICE_RUNNING:
3328 service_enter_running(s, f);
3329 break;
3330
3331 case SERVICE_STOP_WATCHDOG:
3332 case SERVICE_STOP_SIGTERM:
3333 case SERVICE_STOP_SIGKILL:
3334
3335 if (control_pid_good(s) <= 0)
3336 service_enter_stop_post(s, f);
3337
3338 /* If there is still a control process, wait for that first */
3339 break;
3340
3341 case SERVICE_STOP_POST:
3342 case SERVICE_FINAL_SIGTERM:
3343 case SERVICE_FINAL_SIGKILL:
3344
3345 if (control_pid_good(s) <= 0)
3346 service_enter_dead(s, f, true);
3347 break;
3348
3349 default:
3350 assert_not_reached("Uh, main process died at wrong time.");
3351 }
3352 }
3353
3354 } else if (s->control_pid == pid) {
3355 s->control_pid = 0;
3356
3357 if (s->control_command) {
3358 exec_status_exit(&s->control_command->exec_status, &s->exec_context, pid, code, status);
3359
3360 if (s->control_command->flags & EXEC_COMMAND_IGNORE_FAILURE)
3361 f = SERVICE_SUCCESS;
3362 }
3363
3364 unit_log_process_exit(
3365 u, f == SERVICE_SUCCESS ? LOG_DEBUG : LOG_NOTICE,
3366 "Control process",
3367 service_exec_command_to_string(s->control_command_id),
3368 code, status);
3369
3370 if (s->result == SERVICE_SUCCESS)
3371 s->result = f;
3372
3373 if (s->control_command &&
3374 s->control_command->command_next &&
3375 f == SERVICE_SUCCESS) {
3376
3377 /* There is another command to *
3378 * execute, so let's do that. */
3379
3380 log_unit_debug(u, "Running next control command for state %s.", service_state_to_string(s->state));
3381 service_run_next_control(s);
3382
3383 } else {
3384 /* No further commands for this step, so let's
3385 * figure out what to do next */
3386
3387 s->control_command = NULL;
3388 s->control_command_id = _SERVICE_EXEC_COMMAND_INVALID;
3389
3390 log_unit_debug(u, "Got final SIGCHLD for state %s.", service_state_to_string(s->state));
3391
3392 switch (s->state) {
3393
3394 case SERVICE_START_PRE:
3395 if (f == SERVICE_SUCCESS)
3396 service_enter_start(s);
3397 else
3398 service_enter_signal(s, SERVICE_STOP_SIGTERM, f);
3399 break;
3400
3401 case SERVICE_START:
3402 if (s->type != SERVICE_FORKING)
3403 /* Maybe spurious event due to a reload that changed the type? */
3404 break;
3405
3406 if (f != SERVICE_SUCCESS) {
3407 service_enter_signal(s, SERVICE_STOP_SIGTERM, f);
3408 break;
3409 }
3410
3411 if (s->pid_file) {
3412 bool has_start_post;
3413 int r;
3414
3415 /* Let's try to load the pid file here if we can.
3416 * The PID file might actually be created by a START_POST
3417 * script. In that case don't worry if the loading fails. */
3418
3419 has_start_post = s->exec_command[SERVICE_EXEC_START_POST];
3420 r = service_load_pid_file(s, !has_start_post);
3421 if (!has_start_post && r < 0) {
3422 r = service_demand_pid_file(s);
3423 if (r < 0 || cgroup_good(s) == 0)
3424 service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_FAILURE_PROTOCOL);
3425 break;
3426 }
3427 } else
3428 service_search_main_pid(s);
3429
3430 service_enter_start_post(s);
3431 break;
3432
3433 case SERVICE_START_POST:
3434 if (f != SERVICE_SUCCESS) {
3435 service_enter_signal(s, SERVICE_STOP_SIGTERM, f);
3436 break;
3437 }
3438
3439 if (s->pid_file) {
3440 int r;
3441
3442 r = service_load_pid_file(s, true);
3443 if (r < 0) {
3444 r = service_demand_pid_file(s);
3445 if (r < 0 || cgroup_good(s) == 0)
3446 service_enter_stop(s, SERVICE_FAILURE_PROTOCOL);
3447 break;
3448 }
3449 } else
3450 service_search_main_pid(s);
3451
3452 service_enter_running(s, SERVICE_SUCCESS);
3453 break;
3454
3455 case SERVICE_RELOAD:
3456 if (f == SERVICE_SUCCESS)
3457 if (service_load_pid_file(s, true) < 0)
3458 service_search_main_pid(s);
3459
3460 s->reload_result = f;
3461 service_enter_running(s, SERVICE_SUCCESS);
3462 break;
3463
3464 case SERVICE_STOP:
3465 service_enter_signal(s, SERVICE_STOP_SIGTERM, f);
3466 break;
3467
3468 case SERVICE_STOP_WATCHDOG:
3469 case SERVICE_STOP_SIGTERM:
3470 case SERVICE_STOP_SIGKILL:
3471 if (main_pid_good(s) <= 0)
3472 service_enter_stop_post(s, f);
3473
3474 /* If there is still a service process around, wait until
3475 * that one quit, too */
3476 break;
3477
3478 case SERVICE_STOP_POST:
3479 case SERVICE_FINAL_SIGTERM:
3480 case SERVICE_FINAL_SIGKILL:
3481 if (main_pid_good(s) <= 0)
3482 service_enter_dead(s, f, true);
3483 break;
3484
3485 default:
3486 assert_not_reached("Uh, control process died at wrong time.");
3487 }
3488 }
3489 } else /* Neither control nor main PID? If so, don't notify about anything */
3490 notify_dbus = false;
3491
3492 /* Notify clients about changed exit status */
3493 if (notify_dbus)
3494 unit_add_to_dbus_queue(u);
3495
3496 /* We watch the main/control process otherwise we can't retrieve the unit they
3497 * belong to with cgroupv1. But if they are not our direct child, we won't get a
3498 * SIGCHLD for them. Therefore we need to look for others to watch so we can
3499 * detect when the cgroup becomes empty. Note that the control process is always
3500 * our child so it's pointless to watch all other processes. */
3501 if (!control_pid_good(s))
3502 if (!s->main_pid_known || s->main_pid_alien)
3503 (void) unit_enqueue_rewatch_pids(u);
3504 }
3505
3506 static int service_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) {
3507 Service *s = SERVICE(userdata);
3508
3509 assert(s);
3510 assert(source == s->timer_event_source);
3511
3512 switch (s->state) {
3513
3514 case SERVICE_START_PRE:
3515 case SERVICE_START:
3516 log_unit_warning(UNIT(s), "%s operation timed out. Terminating.", s->state == SERVICE_START ? "Start" : "Start-pre");
3517 service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_FAILURE_TIMEOUT);
3518 break;
3519
3520 case SERVICE_START_POST:
3521 log_unit_warning(UNIT(s), "Start-post operation timed out. Stopping.");
3522 service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_FAILURE_TIMEOUT);
3523 break;
3524
3525 case SERVICE_RUNNING:
3526 log_unit_warning(UNIT(s), "Service reached runtime time limit. Stopping.");
3527 service_enter_stop(s, SERVICE_FAILURE_TIMEOUT);
3528 break;
3529
3530 case SERVICE_RELOAD:
3531 log_unit_warning(UNIT(s), "Reload operation timed out. Killing reload process.");
3532 service_kill_control_process(s);
3533 s->reload_result = SERVICE_FAILURE_TIMEOUT;
3534 service_enter_running(s, SERVICE_SUCCESS);
3535 break;
3536
3537 case SERVICE_STOP:
3538 log_unit_warning(UNIT(s), "Stopping timed out. Terminating.");
3539 service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_FAILURE_TIMEOUT);
3540 break;
3541
3542 case SERVICE_STOP_WATCHDOG:
3543 log_unit_warning(UNIT(s), "State 'stop-watchdog' timed out. Terminating.");
3544 service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_FAILURE_TIMEOUT);
3545 break;
3546
3547 case SERVICE_STOP_SIGTERM:
3548 if (s->kill_context.send_sigkill) {
3549 log_unit_warning(UNIT(s), "State 'stop-sigterm' timed out. Killing.");
3550 service_enter_signal(s, SERVICE_STOP_SIGKILL, SERVICE_FAILURE_TIMEOUT);
3551 } else {
3552 log_unit_warning(UNIT(s), "State 'stop-sigterm' timed out. Skipping SIGKILL.");
3553 service_enter_stop_post(s, SERVICE_FAILURE_TIMEOUT);
3554 }
3555
3556 break;
3557
3558 case SERVICE_STOP_SIGKILL:
3559 /* Uh, we sent a SIGKILL and it is still not gone?
3560 * Must be something we cannot kill, so let's just be
3561 * weirded out and continue */
3562
3563 log_unit_warning(UNIT(s), "Processes still around after SIGKILL. Ignoring.");
3564 service_enter_stop_post(s, SERVICE_FAILURE_TIMEOUT);
3565 break;
3566
3567 case SERVICE_STOP_POST:
3568 log_unit_warning(UNIT(s), "State 'stop-post' timed out. Terminating.");
3569 service_enter_signal(s, SERVICE_FINAL_SIGTERM, SERVICE_FAILURE_TIMEOUT);
3570 break;
3571
3572 case SERVICE_FINAL_SIGTERM:
3573 if (s->kill_context.send_sigkill) {
3574 log_unit_warning(UNIT(s), "State 'stop-final-sigterm' timed out. Killing.");
3575 service_enter_signal(s, SERVICE_FINAL_SIGKILL, SERVICE_FAILURE_TIMEOUT);
3576 } else {
3577 log_unit_warning(UNIT(s), "State 'stop-final-sigterm' timed out. Skipping SIGKILL. Entering failed mode.");
3578 service_enter_dead(s, SERVICE_FAILURE_TIMEOUT, false);
3579 }
3580
3581 break;
3582
3583 case SERVICE_FINAL_SIGKILL:
3584 log_unit_warning(UNIT(s), "Processes still around after final SIGKILL. Entering failed mode.");
3585 service_enter_dead(s, SERVICE_FAILURE_TIMEOUT, true);
3586 break;
3587
3588 case SERVICE_AUTO_RESTART:
3589 if (s->restart_usec > 0) {
3590 char buf_restart[FORMAT_TIMESPAN_MAX];
3591 log_unit_info(UNIT(s),
3592 "Service RestartSec=%s expired, scheduling restart.",
3593 format_timespan(buf_restart, sizeof buf_restart, s->restart_usec, USEC_PER_SEC));
3594 } else
3595 log_unit_info(UNIT(s),
3596 "Service has no hold-off time (RestartSec=0), scheduling restart.");
3597
3598 service_enter_restart(s);
3599 break;
3600
3601 default:
3602 assert_not_reached("Timeout at wrong time.");
3603 }
3604
3605 return 0;
3606 }
3607
3608 static int service_dispatch_watchdog(sd_event_source *source, usec_t usec, void *userdata) {
3609 Service *s = SERVICE(userdata);
3610 char t[FORMAT_TIMESPAN_MAX];
3611 usec_t watchdog_usec;
3612
3613 assert(s);
3614 assert(source == s->watchdog_event_source);
3615
3616 watchdog_usec = service_get_watchdog_usec(s);
3617
3618 if (UNIT(s)->manager->service_watchdogs) {
3619 log_unit_error(UNIT(s), "Watchdog timeout (limit %s)!",
3620 format_timespan(t, sizeof(t), watchdog_usec, 1));
3621
3622 service_enter_signal(s, SERVICE_STOP_WATCHDOG, SERVICE_FAILURE_WATCHDOG);
3623 } else
3624 log_unit_warning(UNIT(s), "Watchdog disabled! Ignoring watchdog timeout (limit %s)!",
3625 format_timespan(t, sizeof(t), watchdog_usec, 1));
3626
3627 return 0;
3628 }
3629
3630 static bool service_notify_message_authorized(Service *s, pid_t pid, char **tags, FDSet *fds) {
3631 assert(s);
3632
3633 if (s->notify_access == NOTIFY_NONE) {
3634 log_unit_warning(UNIT(s), "Got notification message from PID "PID_FMT", but reception is disabled.", pid);
3635 return false;
3636 }
3637
3638 if (s->notify_access == NOTIFY_MAIN && pid != s->main_pid) {
3639 if (s->main_pid != 0)
3640 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);
3641 else
3642 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);
3643
3644 return false;
3645 }
3646
3647 if (s->notify_access == NOTIFY_EXEC && pid != s->main_pid && pid != s->control_pid) {
3648 if (s->main_pid != 0 && s->control_pid != 0)
3649 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,
3650 pid, s->main_pid, s->control_pid);
3651 else if (s->main_pid != 0)
3652 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);
3653 else if (s->control_pid != 0)
3654 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);
3655 else
3656 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);
3657
3658 return false;
3659 }
3660
3661 return true;
3662 }
3663
3664 static void service_notify_message(
3665 Unit *u,
3666 const struct ucred *ucred,
3667 char **tags,
3668 FDSet *fds) {
3669
3670 Service *s = SERVICE(u);
3671 bool notify_dbus = false;
3672 const char *e;
3673 char **i;
3674 int r;
3675
3676 assert(u);
3677 assert(ucred);
3678
3679 if (!service_notify_message_authorized(SERVICE(u), ucred->pid, tags, fds))
3680 return;
3681
3682 if (DEBUG_LOGGING) {
3683 _cleanup_free_ char *cc = NULL;
3684
3685 cc = strv_join(tags, ", ");
3686 log_unit_debug(u, "Got notification message from PID "PID_FMT" (%s)", ucred->pid, isempty(cc) ? "n/a" : cc);
3687 }
3688
3689 /* Interpret MAINPID= */
3690 e = strv_find_startswith(tags, "MAINPID=");
3691 if (e && IN_SET(s->state, SERVICE_START, SERVICE_START_POST, SERVICE_RUNNING, SERVICE_RELOAD)) {
3692 pid_t new_main_pid;
3693
3694 if (parse_pid(e, &new_main_pid) < 0)
3695 log_unit_warning(u, "Failed to parse MAINPID= field in notification message, ignoring: %s", e);
3696 else if (!s->main_pid_known || new_main_pid != s->main_pid) {
3697
3698 r = service_is_suitable_main_pid(s, new_main_pid, LOG_WARNING);
3699 if (r == 0) {
3700 /* The new main PID is a bit suspicous, which is OK if the sender is privileged. */
3701
3702 if (ucred->uid == 0) {
3703 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);
3704 r = 1;
3705 } else
3706 log_unit_debug(u, "New main PID "PID_FMT" does not belong to service, refusing.", new_main_pid);
3707 }
3708 if (r > 0) {
3709 service_set_main_pid(s, new_main_pid);
3710
3711 r = unit_watch_pid(UNIT(s), new_main_pid, false);
3712 if (r < 0)
3713 log_unit_warning_errno(UNIT(s), r, "Failed to watch new main PID "PID_FMT" for service: %m", new_main_pid);
3714
3715 notify_dbus = true;
3716 }
3717 }
3718 }
3719
3720 /* Interpret READY=/STOPPING=/RELOADING=. Last one wins. */
3721 STRV_FOREACH_BACKWARDS(i, tags) {
3722
3723 if (streq(*i, "READY=1")) {
3724 s->notify_state = NOTIFY_READY;
3725
3726 /* Type=notify services inform us about completed
3727 * initialization with READY=1 */
3728 if (s->type == SERVICE_NOTIFY && s->state == SERVICE_START)
3729 service_enter_start_post(s);
3730
3731 /* Sending READY=1 while we are reloading informs us
3732 * that the reloading is complete */
3733 if (s->state == SERVICE_RELOAD && s->control_pid == 0)
3734 service_enter_running(s, SERVICE_SUCCESS);
3735
3736 notify_dbus = true;
3737 break;
3738
3739 } else if (streq(*i, "RELOADING=1")) {
3740 s->notify_state = NOTIFY_RELOADING;
3741
3742 if (s->state == SERVICE_RUNNING)
3743 service_enter_reload_by_notify(s);
3744
3745 notify_dbus = true;
3746 break;
3747
3748 } else if (streq(*i, "STOPPING=1")) {
3749 s->notify_state = NOTIFY_STOPPING;
3750
3751 if (s->state == SERVICE_RUNNING)
3752 service_enter_stop_by_notify(s);
3753
3754 notify_dbus = true;
3755 break;
3756 }
3757 }
3758
3759 /* Interpret STATUS= */
3760 e = strv_find_startswith(tags, "STATUS=");
3761 if (e) {
3762 _cleanup_free_ char *t = NULL;
3763
3764 if (!isempty(e)) {
3765 /* Note that this size limit check is mostly paranoia: since the datagram size we are willing
3766 * to process is already limited to NOTIFY_BUFFER_MAX, this limit here should never be hit. */
3767 if (strlen(e) > STATUS_TEXT_MAX)
3768 log_unit_warning(u, "Status message overly long (%zu > %u), ignoring.", strlen(e), STATUS_TEXT_MAX);
3769 else if (!utf8_is_valid(e))
3770 log_unit_warning(u, "Status message in notification message is not UTF-8 clean, ignoring.");
3771 else {
3772 t = strdup(e);
3773 if (!t)
3774 log_oom();
3775 }
3776 }
3777
3778 if (!streq_ptr(s->status_text, t)) {
3779 free_and_replace(s->status_text, t);
3780 notify_dbus = true;
3781 }
3782 }
3783
3784 /* Interpret ERRNO= */
3785 e = strv_find_startswith(tags, "ERRNO=");
3786 if (e) {
3787 int status_errno;
3788
3789 status_errno = parse_errno(e);
3790 if (status_errno < 0)
3791 log_unit_warning_errno(u, status_errno,
3792 "Failed to parse ERRNO= field value '%s' in notification message: %m", e);
3793 else if (s->status_errno != status_errno) {
3794 s->status_errno = status_errno;
3795 notify_dbus = true;
3796 }
3797 }
3798
3799 /* Interpret EXTEND_TIMEOUT= */
3800 e = strv_find_startswith(tags, "EXTEND_TIMEOUT_USEC=");
3801 if (e) {
3802 usec_t extend_timeout_usec;
3803 if (safe_atou64(e, &extend_timeout_usec) < 0)
3804 log_unit_warning(u, "Failed to parse EXTEND_TIMEOUT_USEC=%s", e);
3805 else
3806 service_extend_timeout(s, extend_timeout_usec);
3807 }
3808
3809 /* Interpret WATCHDOG= */
3810 if (strv_find(tags, "WATCHDOG=1"))
3811 service_reset_watchdog(s);
3812
3813 e = strv_find_startswith(tags, "WATCHDOG_USEC=");
3814 if (e) {
3815 usec_t watchdog_override_usec;
3816 if (safe_atou64(e, &watchdog_override_usec) < 0)
3817 log_unit_warning(u, "Failed to parse WATCHDOG_USEC=%s", e);
3818 else
3819 service_override_watchdog_timeout(s, watchdog_override_usec);
3820 }
3821
3822 /* Process FD store messages. Either FDSTOREREMOVE=1 for removal, or FDSTORE=1 for addition. In both cases,
3823 * process FDNAME= for picking the file descriptor name to use. Note that FDNAME= is required when removing
3824 * fds, but optional when pushing in new fds, for compatibility reasons. */
3825 if (strv_find(tags, "FDSTOREREMOVE=1")) {
3826 const char *name;
3827
3828 name = strv_find_startswith(tags, "FDNAME=");
3829 if (!name || !fdname_is_valid(name))
3830 log_unit_warning(u, "FDSTOREREMOVE=1 requested, but no valid file descriptor name passed, ignoring.");
3831 else
3832 service_remove_fd_store(s, name);
3833
3834 } else if (strv_find(tags, "FDSTORE=1")) {
3835 const char *name;
3836
3837 name = strv_find_startswith(tags, "FDNAME=");
3838 if (name && !fdname_is_valid(name)) {
3839 log_unit_warning(u, "Passed FDNAME= name is invalid, ignoring.");
3840 name = NULL;
3841 }
3842
3843 (void) service_add_fd_store_set(s, fds, name);
3844 }
3845
3846 /* Notify clients about changed status or main pid */
3847 if (notify_dbus)
3848 unit_add_to_dbus_queue(u);
3849 }
3850
3851 static int service_get_timeout(Unit *u, usec_t *timeout) {
3852 Service *s = SERVICE(u);
3853 uint64_t t;
3854 int r;
3855
3856 if (!s->timer_event_source)
3857 return 0;
3858
3859 r = sd_event_source_get_time(s->timer_event_source, &t);
3860 if (r < 0)
3861 return r;
3862 if (t == USEC_INFINITY)
3863 return 0;
3864
3865 *timeout = t;
3866 return 1;
3867 }
3868
3869 static void service_bus_name_owner_change(
3870 Unit *u,
3871 const char *name,
3872 const char *old_owner,
3873 const char *new_owner) {
3874
3875 Service *s = SERVICE(u);
3876 int r;
3877
3878 assert(s);
3879 assert(name);
3880
3881 assert(streq(s->bus_name, name));
3882 assert(old_owner || new_owner);
3883
3884 if (old_owner && new_owner)
3885 log_unit_debug(u, "D-Bus name %s changed owner from %s to %s", name, old_owner, new_owner);
3886 else if (old_owner)
3887 log_unit_debug(u, "D-Bus name %s no longer registered by %s", name, old_owner);
3888 else
3889 log_unit_debug(u, "D-Bus name %s now registered by %s", name, new_owner);
3890
3891 s->bus_name_good = !!new_owner;
3892
3893 /* Track the current owner, so we can reconstruct changes after a daemon reload */
3894 r = free_and_strdup(&s->bus_name_owner, new_owner);
3895 if (r < 0) {
3896 log_unit_error_errno(u, r, "Unable to set new bus name owner %s: %m", new_owner);
3897 return;
3898 }
3899
3900 if (s->type == SERVICE_DBUS) {
3901
3902 /* service_enter_running() will figure out what to
3903 * do */
3904 if (s->state == SERVICE_RUNNING)
3905 service_enter_running(s, SERVICE_SUCCESS);
3906 else if (s->state == SERVICE_START && new_owner)
3907 service_enter_start_post(s);
3908
3909 } else if (new_owner &&
3910 s->main_pid <= 0 &&
3911 IN_SET(s->state,
3912 SERVICE_START,
3913 SERVICE_START_POST,
3914 SERVICE_RUNNING,
3915 SERVICE_RELOAD)) {
3916
3917 _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
3918 pid_t pid;
3919
3920 /* Try to acquire PID from bus service */
3921
3922 r = sd_bus_get_name_creds(u->manager->api_bus, name, SD_BUS_CREDS_PID, &creds);
3923 if (r >= 0)
3924 r = sd_bus_creds_get_pid(creds, &pid);
3925 if (r >= 0) {
3926 log_unit_debug(u, "D-Bus name %s is now owned by process " PID_FMT, name, pid);
3927
3928 service_set_main_pid(s, pid);
3929 unit_watch_pid(UNIT(s), pid, false);
3930 }
3931 }
3932 }
3933
3934 int service_set_socket_fd(Service *s, int fd, Socket *sock, bool selinux_context_net) {
3935 _cleanup_free_ char *peer = NULL;
3936 int r;
3937
3938 assert(s);
3939 assert(fd >= 0);
3940
3941 /* This is called by the socket code when instantiating a new service for a stream socket and the socket needs
3942 * to be configured. We take ownership of the passed fd on success. */
3943
3944 if (UNIT(s)->load_state != UNIT_LOADED)
3945 return -EINVAL;
3946
3947 if (s->socket_fd >= 0)
3948 return -EBUSY;
3949
3950 if (s->state != SERVICE_DEAD)
3951 return -EAGAIN;
3952
3953 if (getpeername_pretty(fd, true, &peer) >= 0) {
3954
3955 if (UNIT(s)->description) {
3956 _cleanup_free_ char *a;
3957
3958 a = strjoin(UNIT(s)->description, " (", peer, ")");
3959 if (!a)
3960 return -ENOMEM;
3961
3962 r = unit_set_description(UNIT(s), a);
3963 } else
3964 r = unit_set_description(UNIT(s), peer);
3965
3966 if (r < 0)
3967 return r;
3968 }
3969
3970 r = unit_add_two_dependencies(UNIT(sock), UNIT_BEFORE, UNIT_TRIGGERS, UNIT(s), false, UNIT_DEPENDENCY_IMPLICIT);
3971 if (r < 0)
3972 return r;
3973
3974 s->socket_fd = fd;
3975 s->socket_fd_selinux_context_net = selinux_context_net;
3976
3977 unit_ref_set(&s->accept_socket, UNIT(s), UNIT(sock));
3978 return 0;
3979 }
3980
3981 static void service_reset_failed(Unit *u) {
3982 Service *s = SERVICE(u);
3983
3984 assert(s);
3985
3986 if (s->state == SERVICE_FAILED)
3987 service_set_state(s, SERVICE_DEAD);
3988
3989 s->result = SERVICE_SUCCESS;
3990 s->reload_result = SERVICE_SUCCESS;
3991 s->n_restarts = 0;
3992 s->flush_n_restarts = false;
3993 }
3994
3995 static int service_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) {
3996 Service *s = SERVICE(u);
3997
3998 assert(s);
3999
4000 return unit_kill_common(u, who, signo, s->main_pid, s->control_pid, error);
4001 }
4002
4003 static int service_main_pid(Unit *u) {
4004 Service *s = SERVICE(u);
4005
4006 assert(s);
4007
4008 return s->main_pid;
4009 }
4010
4011 static int service_control_pid(Unit *u) {
4012 Service *s = SERVICE(u);
4013
4014 assert(s);
4015
4016 return s->control_pid;
4017 }
4018
4019 static bool service_needs_console(Unit *u) {
4020 Service *s = SERVICE(u);
4021
4022 assert(s);
4023
4024 /* We provide our own implementation of this here, instead of relying of the generic implementation
4025 * unit_needs_console() provides, since we want to return false if we are in SERVICE_EXITED state. */
4026
4027 if (!exec_context_may_touch_console(&s->exec_context))
4028 return false;
4029
4030 return IN_SET(s->state,
4031 SERVICE_START_PRE,
4032 SERVICE_START,
4033 SERVICE_START_POST,
4034 SERVICE_RUNNING,
4035 SERVICE_RELOAD,
4036 SERVICE_STOP,
4037 SERVICE_STOP_WATCHDOG,
4038 SERVICE_STOP_SIGTERM,
4039 SERVICE_STOP_SIGKILL,
4040 SERVICE_STOP_POST,
4041 SERVICE_FINAL_SIGTERM,
4042 SERVICE_FINAL_SIGKILL);
4043 }
4044
4045 static int service_exit_status(Unit *u) {
4046 Service *s = SERVICE(u);
4047
4048 assert(u);
4049
4050 if (s->main_exec_status.pid <= 0 ||
4051 !dual_timestamp_is_set(&s->main_exec_status.exit_timestamp))
4052 return -ENODATA;
4053
4054 if (s->main_exec_status.code != CLD_EXITED)
4055 return -EBADE;
4056
4057 return s->main_exec_status.status;
4058 }
4059
4060 static const char* const service_restart_table[_SERVICE_RESTART_MAX] = {
4061 [SERVICE_RESTART_NO] = "no",
4062 [SERVICE_RESTART_ON_SUCCESS] = "on-success",
4063 [SERVICE_RESTART_ON_FAILURE] = "on-failure",
4064 [SERVICE_RESTART_ON_ABNORMAL] = "on-abnormal",
4065 [SERVICE_RESTART_ON_WATCHDOG] = "on-watchdog",
4066 [SERVICE_RESTART_ON_ABORT] = "on-abort",
4067 [SERVICE_RESTART_ALWAYS] = "always",
4068 };
4069
4070 DEFINE_STRING_TABLE_LOOKUP(service_restart, ServiceRestart);
4071
4072 static const char* const service_type_table[_SERVICE_TYPE_MAX] = {
4073 [SERVICE_SIMPLE] = "simple",
4074 [SERVICE_FORKING] = "forking",
4075 [SERVICE_ONESHOT] = "oneshot",
4076 [SERVICE_DBUS] = "dbus",
4077 [SERVICE_NOTIFY] = "notify",
4078 [SERVICE_IDLE] = "idle",
4079 [SERVICE_EXEC] = "exec",
4080 };
4081
4082 DEFINE_STRING_TABLE_LOOKUP(service_type, ServiceType);
4083
4084 static const char* const service_exec_command_table[_SERVICE_EXEC_COMMAND_MAX] = {
4085 [SERVICE_EXEC_START_PRE] = "ExecStartPre",
4086 [SERVICE_EXEC_START] = "ExecStart",
4087 [SERVICE_EXEC_START_POST] = "ExecStartPost",
4088 [SERVICE_EXEC_RELOAD] = "ExecReload",
4089 [SERVICE_EXEC_STOP] = "ExecStop",
4090 [SERVICE_EXEC_STOP_POST] = "ExecStopPost",
4091 };
4092
4093 DEFINE_STRING_TABLE_LOOKUP(service_exec_command, ServiceExecCommand);
4094
4095 static const char* const notify_state_table[_NOTIFY_STATE_MAX] = {
4096 [NOTIFY_UNKNOWN] = "unknown",
4097 [NOTIFY_READY] = "ready",
4098 [NOTIFY_RELOADING] = "reloading",
4099 [NOTIFY_STOPPING] = "stopping",
4100 };
4101
4102 DEFINE_STRING_TABLE_LOOKUP(notify_state, NotifyState);
4103
4104 static const char* const service_result_table[_SERVICE_RESULT_MAX] = {
4105 [SERVICE_SUCCESS] = "success",
4106 [SERVICE_FAILURE_RESOURCES] = "resources",
4107 [SERVICE_FAILURE_PROTOCOL] = "protocol",
4108 [SERVICE_FAILURE_TIMEOUT] = "timeout",
4109 [SERVICE_FAILURE_EXIT_CODE] = "exit-code",
4110 [SERVICE_FAILURE_SIGNAL] = "signal",
4111 [SERVICE_FAILURE_CORE_DUMP] = "core-dump",
4112 [SERVICE_FAILURE_WATCHDOG] = "watchdog",
4113 [SERVICE_FAILURE_START_LIMIT_HIT] = "start-limit-hit",
4114 };
4115
4116 DEFINE_STRING_TABLE_LOOKUP(service_result, ServiceResult);
4117
4118 const UnitVTable service_vtable = {
4119 .object_size = sizeof(Service),
4120 .exec_context_offset = offsetof(Service, exec_context),
4121 .cgroup_context_offset = offsetof(Service, cgroup_context),
4122 .kill_context_offset = offsetof(Service, kill_context),
4123 .exec_runtime_offset = offsetof(Service, exec_runtime),
4124 .dynamic_creds_offset = offsetof(Service, dynamic_creds),
4125
4126 .sections =
4127 "Unit\0"
4128 "Service\0"
4129 "Install\0",
4130 .private_section = "Service",
4131
4132 .can_transient = true,
4133 .can_delegate = true,
4134
4135 .init = service_init,
4136 .done = service_done,
4137 .load = service_load,
4138 .release_resources = service_release_resources,
4139
4140 .coldplug = service_coldplug,
4141
4142 .dump = service_dump,
4143
4144 .start = service_start,
4145 .stop = service_stop,
4146 .reload = service_reload,
4147
4148 .can_reload = service_can_reload,
4149
4150 .kill = service_kill,
4151
4152 .serialize = service_serialize,
4153 .deserialize_item = service_deserialize_item,
4154
4155 .active_state = service_active_state,
4156 .sub_state_to_string = service_sub_state_to_string,
4157
4158 .will_restart = service_will_restart,
4159
4160 .may_gc = service_may_gc,
4161
4162 .sigchld_event = service_sigchld_event,
4163
4164 .reset_failed = service_reset_failed,
4165
4166 .notify_cgroup_empty = service_notify_cgroup_empty_event,
4167 .notify_message = service_notify_message,
4168
4169 .main_pid = service_main_pid,
4170 .control_pid = service_control_pid,
4171
4172 .bus_name_owner_change = service_bus_name_owner_change,
4173
4174 .bus_vtable = bus_service_vtable,
4175 .bus_set_property = bus_service_set_property,
4176 .bus_commit_properties = bus_service_commit_properties,
4177
4178 .get_timeout = service_get_timeout,
4179 .needs_console = service_needs_console,
4180 .exit_status = service_exit_status,
4181
4182 .status_message_formats = {
4183 .starting_stopping = {
4184 [0] = "Starting %s...",
4185 [1] = "Stopping %s...",
4186 },
4187 .finished_start_job = {
4188 [JOB_DONE] = "Started %s.",
4189 [JOB_FAILED] = "Failed to start %s.",
4190 },
4191 .finished_stop_job = {
4192 [JOB_DONE] = "Stopped %s.",
4193 [JOB_FAILED] = "Stopped (with error) %s.",
4194 },
4195 },
4196 };
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