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Merge pull request #9594 from filbranden/cpu_quota_period1
[thirdparty/systemd.git] / src / core / service.c
1 /* SPDX-License-Identifier: LGPL-2.1+ */
2
3 #include <errno.h>
4 #include <signal.h>
5 #include <unistd.h>
6
7 #include "sd-messages.h"
8
9 #include "alloc-util.h"
10 #include "async.h"
11 #include "bus-error.h"
12 #include "bus-kernel.h"
13 #include "bus-util.h"
14 #include "dbus-service.h"
15 #include "dbus-unit.h"
16 #include "def.h"
17 #include "env-util.h"
18 #include "escape.h"
19 #include "exit-status.h"
20 #include "fd-util.h"
21 #include "fileio.h"
22 #include "format-util.h"
23 #include "fs-util.h"
24 #include "load-dropin.h"
25 #include "load-fragment.h"
26 #include "log.h"
27 #include "manager.h"
28 #include "parse-util.h"
29 #include "path-util.h"
30 #include "process-util.h"
31 #include "serialize.h"
32 #include "service.h"
33 #include "signal-util.h"
34 #include "special.h"
35 #include "stdio-util.h"
36 #include "string-table.h"
37 #include "string-util.h"
38 #include "strv.h"
39 #include "unit-name.h"
40 #include "unit.h"
41 #include "utf8.h"
42 #include "util.h"
43
44 static const UnitActiveState state_translation_table[_SERVICE_STATE_MAX] = {
45 [SERVICE_DEAD] = UNIT_INACTIVE,
46 [SERVICE_START_PRE] = UNIT_ACTIVATING,
47 [SERVICE_START] = UNIT_ACTIVATING,
48 [SERVICE_START_POST] = UNIT_ACTIVATING,
49 [SERVICE_RUNNING] = UNIT_ACTIVE,
50 [SERVICE_EXITED] = UNIT_ACTIVE,
51 [SERVICE_RELOAD] = UNIT_RELOADING,
52 [SERVICE_STOP] = UNIT_DEACTIVATING,
53 [SERVICE_STOP_WATCHDOG] = UNIT_DEACTIVATING,
54 [SERVICE_STOP_SIGTERM] = UNIT_DEACTIVATING,
55 [SERVICE_STOP_SIGKILL] = UNIT_DEACTIVATING,
56 [SERVICE_STOP_POST] = UNIT_DEACTIVATING,
57 [SERVICE_FINAL_SIGTERM] = UNIT_DEACTIVATING,
58 [SERVICE_FINAL_SIGKILL] = UNIT_DEACTIVATING,
59 [SERVICE_FAILED] = UNIT_FAILED,
60 [SERVICE_AUTO_RESTART] = UNIT_ACTIVATING
61 };
62
63 /* For Type=idle we never want to delay any other jobs, hence we
64 * consider idle jobs active as soon as we start working on them */
65 static const UnitActiveState state_translation_table_idle[_SERVICE_STATE_MAX] = {
66 [SERVICE_DEAD] = UNIT_INACTIVE,
67 [SERVICE_START_PRE] = UNIT_ACTIVE,
68 [SERVICE_START] = UNIT_ACTIVE,
69 [SERVICE_START_POST] = UNIT_ACTIVE,
70 [SERVICE_RUNNING] = UNIT_ACTIVE,
71 [SERVICE_EXITED] = UNIT_ACTIVE,
72 [SERVICE_RELOAD] = UNIT_RELOADING,
73 [SERVICE_STOP] = UNIT_DEACTIVATING,
74 [SERVICE_STOP_WATCHDOG] = UNIT_DEACTIVATING,
75 [SERVICE_STOP_SIGTERM] = UNIT_DEACTIVATING,
76 [SERVICE_STOP_SIGKILL] = UNIT_DEACTIVATING,
77 [SERVICE_STOP_POST] = UNIT_DEACTIVATING,
78 [SERVICE_FINAL_SIGTERM] = UNIT_DEACTIVATING,
79 [SERVICE_FINAL_SIGKILL] = UNIT_DEACTIVATING,
80 [SERVICE_FAILED] = UNIT_FAILED,
81 [SERVICE_AUTO_RESTART] = UNIT_ACTIVATING
82 };
83
84 static int service_dispatch_inotify_io(sd_event_source *source, int fd, uint32_t events, void *userdata);
85 static int service_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata);
86 static int service_dispatch_watchdog(sd_event_source *source, usec_t usec, void *userdata);
87 static int service_dispatch_exec_io(sd_event_source *source, int fd, uint32_t events, void *userdata);
88
89 static void service_enter_signal(Service *s, ServiceState state, ServiceResult f);
90 static void service_enter_reload_by_notify(Service *s);
91
92 static void service_init(Unit *u) {
93 Service *s = SERVICE(u);
94
95 assert(u);
96 assert(u->load_state == UNIT_STUB);
97
98 s->timeout_start_usec = u->manager->default_timeout_start_usec;
99 s->timeout_stop_usec = u->manager->default_timeout_stop_usec;
100 s->restart_usec = u->manager->default_restart_usec;
101 s->runtime_max_usec = USEC_INFINITY;
102 s->type = _SERVICE_TYPE_INVALID;
103 s->socket_fd = -1;
104 s->stdin_fd = s->stdout_fd = s->stderr_fd = -1;
105 s->guess_main_pid = true;
106
107 s->control_command_id = _SERVICE_EXEC_COMMAND_INVALID;
108
109 s->exec_context.keyring_mode = MANAGER_IS_SYSTEM(u->manager) ?
110 EXEC_KEYRING_PRIVATE : EXEC_KEYRING_INHERIT;
111
112 s->watchdog_original_usec = USEC_INFINITY;
113 }
114
115 static void service_unwatch_control_pid(Service *s) {
116 assert(s);
117
118 if (s->control_pid <= 0)
119 return;
120
121 unit_unwatch_pid(UNIT(s), s->control_pid);
122 s->control_pid = 0;
123 }
124
125 static void service_unwatch_main_pid(Service *s) {
126 assert(s);
127
128 if (s->main_pid <= 0)
129 return;
130
131 unit_unwatch_pid(UNIT(s), s->main_pid);
132 s->main_pid = 0;
133 }
134
135 static void service_unwatch_pid_file(Service *s) {
136 if (!s->pid_file_pathspec)
137 return;
138
139 log_unit_debug(UNIT(s), "Stopping watch for PID file %s", s->pid_file_pathspec->path);
140 path_spec_unwatch(s->pid_file_pathspec);
141 path_spec_done(s->pid_file_pathspec);
142 s->pid_file_pathspec = mfree(s->pid_file_pathspec);
143 }
144
145 static int service_set_main_pid(Service *s, pid_t pid) {
146 pid_t ppid;
147
148 assert(s);
149
150 if (pid <= 1)
151 return -EINVAL;
152
153 if (pid == getpid_cached())
154 return -EINVAL;
155
156 if (s->main_pid == pid && s->main_pid_known)
157 return 0;
158
159 if (s->main_pid != pid) {
160 service_unwatch_main_pid(s);
161 exec_status_start(&s->main_exec_status, pid);
162 }
163
164 s->main_pid = pid;
165 s->main_pid_known = true;
166
167 if (get_process_ppid(pid, &ppid) >= 0 && ppid != getpid_cached()) {
168 log_unit_warning(UNIT(s), "Supervising process "PID_FMT" which is not our child. We'll most likely not notice when it exits.", pid);
169 s->main_pid_alien = true;
170 } else
171 s->main_pid_alien = false;
172
173 return 0;
174 }
175
176 void service_close_socket_fd(Service *s) {
177 assert(s);
178
179 /* Undo the effect of service_set_socket_fd(). */
180
181 s->socket_fd = asynchronous_close(s->socket_fd);
182
183 if (UNIT_ISSET(s->accept_socket)) {
184 socket_connection_unref(SOCKET(UNIT_DEREF(s->accept_socket)));
185 unit_ref_unset(&s->accept_socket);
186 }
187 }
188
189 static void service_stop_watchdog(Service *s) {
190 assert(s);
191
192 s->watchdog_event_source = sd_event_source_unref(s->watchdog_event_source);
193 s->watchdog_timestamp = DUAL_TIMESTAMP_NULL;
194 }
195
196 static usec_t service_get_watchdog_usec(Service *s) {
197 assert(s);
198
199 if (s->watchdog_override_enable)
200 return s->watchdog_override_usec;
201
202 return s->watchdog_original_usec;
203 }
204
205 static void service_start_watchdog(Service *s) {
206 usec_t watchdog_usec;
207 int r;
208
209 assert(s);
210
211 watchdog_usec = service_get_watchdog_usec(s);
212 if (IN_SET(watchdog_usec, 0, USEC_INFINITY)) {
213 service_stop_watchdog(s);
214 return;
215 }
216
217 if (s->watchdog_event_source) {
218 r = sd_event_source_set_time(s->watchdog_event_source, usec_add(s->watchdog_timestamp.monotonic, watchdog_usec));
219 if (r < 0) {
220 log_unit_warning_errno(UNIT(s), r, "Failed to reset watchdog timer: %m");
221 return;
222 }
223
224 r = sd_event_source_set_enabled(s->watchdog_event_source, SD_EVENT_ONESHOT);
225 } else {
226 r = sd_event_add_time(
227 UNIT(s)->manager->event,
228 &s->watchdog_event_source,
229 CLOCK_MONOTONIC,
230 usec_add(s->watchdog_timestamp.monotonic, watchdog_usec), 0,
231 service_dispatch_watchdog, s);
232 if (r < 0) {
233 log_unit_warning_errno(UNIT(s), r, "Failed to add watchdog timer: %m");
234 return;
235 }
236
237 (void) sd_event_source_set_description(s->watchdog_event_source, "service-watchdog");
238
239 /* Let's process everything else which might be a sign
240 * of living before we consider a service died. */
241 r = sd_event_source_set_priority(s->watchdog_event_source, SD_EVENT_PRIORITY_IDLE);
242 }
243 if (r < 0)
244 log_unit_warning_errno(UNIT(s), r, "Failed to install watchdog timer: %m");
245 }
246
247 static void service_extend_event_source_timeout(Service *s, sd_event_source *source, usec_t extended) {
248 usec_t current;
249 int r;
250
251 assert(s);
252
253 /* Extends the specified event source timer to at least the specified time, unless it is already later
254 * anyway. */
255
256 if (!source)
257 return;
258
259 r = sd_event_source_get_time(source, &current);
260 if (r < 0) {
261 const char *desc;
262 (void) sd_event_source_get_description(s->timer_event_source, &desc);
263 log_unit_warning_errno(UNIT(s), r, "Failed to retrieve timeout time for event source '%s', ignoring: %m", strna(desc));
264 return;
265 }
266
267 if (current >= extended) /* Current timeout is already longer, ignore this. */
268 return;
269
270 r = sd_event_source_set_time(source, extended);
271 if (r < 0) {
272 const char *desc;
273 (void) sd_event_source_get_description(s->timer_event_source, &desc);
274 log_unit_warning_errno(UNIT(s), r, "Failed to set timeout time for even source '%s', ignoring %m", strna(desc));
275 }
276 }
277
278 static void service_extend_timeout(Service *s, usec_t extend_timeout_usec) {
279 usec_t extended;
280
281 assert(s);
282
283 if (IN_SET(extend_timeout_usec, 0, USEC_INFINITY))
284 return;
285
286 extended = usec_add(now(CLOCK_MONOTONIC), extend_timeout_usec);
287
288 service_extend_event_source_timeout(s, s->timer_event_source, extended);
289 service_extend_event_source_timeout(s, s->watchdog_event_source, extended);
290 }
291
292 static void service_reset_watchdog(Service *s) {
293 assert(s);
294
295 dual_timestamp_get(&s->watchdog_timestamp);
296 service_start_watchdog(s);
297 }
298
299 static void service_override_watchdog_timeout(Service *s, usec_t watchdog_override_usec) {
300 assert(s);
301
302 s->watchdog_override_enable = true;
303 s->watchdog_override_usec = watchdog_override_usec;
304 service_reset_watchdog(s);
305
306 log_unit_debug(UNIT(s), "watchdog_usec="USEC_FMT, s->watchdog_usec);
307 log_unit_debug(UNIT(s), "watchdog_override_usec="USEC_FMT, s->watchdog_override_usec);
308 }
309
310 static void service_fd_store_unlink(ServiceFDStore *fs) {
311
312 if (!fs)
313 return;
314
315 if (fs->service) {
316 assert(fs->service->n_fd_store > 0);
317 LIST_REMOVE(fd_store, fs->service->fd_store, fs);
318 fs->service->n_fd_store--;
319 }
320
321 if (fs->event_source) {
322 sd_event_source_set_enabled(fs->event_source, SD_EVENT_OFF);
323 sd_event_source_unref(fs->event_source);
324 }
325
326 free(fs->fdname);
327 safe_close(fs->fd);
328 free(fs);
329 }
330
331 static void service_release_fd_store(Service *s) {
332 assert(s);
333
334 if (s->n_keep_fd_store > 0)
335 return;
336
337 log_unit_debug(UNIT(s), "Releasing all stored fds");
338 while (s->fd_store)
339 service_fd_store_unlink(s->fd_store);
340
341 assert(s->n_fd_store == 0);
342 }
343
344 static void service_release_resources(Unit *u) {
345 Service *s = SERVICE(u);
346
347 assert(s);
348
349 if (!s->fd_store && s->stdin_fd < 0 && s->stdout_fd < 0 && s->stderr_fd < 0)
350 return;
351
352 log_unit_debug(u, "Releasing resources.");
353
354 s->stdin_fd = safe_close(s->stdin_fd);
355 s->stdout_fd = safe_close(s->stdout_fd);
356 s->stderr_fd = safe_close(s->stderr_fd);
357
358 service_release_fd_store(s);
359 }
360
361 static void service_done(Unit *u) {
362 Service *s = SERVICE(u);
363
364 assert(s);
365
366 s->pid_file = mfree(s->pid_file);
367 s->status_text = mfree(s->status_text);
368
369 s->exec_runtime = exec_runtime_unref(s->exec_runtime, false);
370 exec_command_free_array(s->exec_command, _SERVICE_EXEC_COMMAND_MAX);
371 s->control_command = NULL;
372 s->main_command = NULL;
373
374 dynamic_creds_unref(&s->dynamic_creds);
375
376 exit_status_set_free(&s->restart_prevent_status);
377 exit_status_set_free(&s->restart_force_status);
378 exit_status_set_free(&s->success_status);
379
380 /* This will leak a process, but at least no memory or any of
381 * our resources */
382 service_unwatch_main_pid(s);
383 service_unwatch_control_pid(s);
384 service_unwatch_pid_file(s);
385
386 if (s->bus_name) {
387 unit_unwatch_bus_name(u, s->bus_name);
388 s->bus_name = mfree(s->bus_name);
389 }
390
391 s->bus_name_owner = mfree(s->bus_name_owner);
392
393 s->usb_function_descriptors = mfree(s->usb_function_descriptors);
394 s->usb_function_strings = mfree(s->usb_function_strings);
395
396 service_close_socket_fd(s);
397 s->peer = socket_peer_unref(s->peer);
398
399 unit_ref_unset(&s->accept_socket);
400
401 service_stop_watchdog(s);
402
403 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
404 s->exec_fd_event_source = sd_event_source_unref(s->exec_fd_event_source);
405
406 service_release_resources(u);
407 }
408
409 static int on_fd_store_io(sd_event_source *e, int fd, uint32_t revents, void *userdata) {
410 ServiceFDStore *fs = userdata;
411
412 assert(e);
413 assert(fs);
414
415 /* If we get either EPOLLHUP or EPOLLERR, it's time to remove this entry from the fd store */
416 log_unit_debug(UNIT(fs->service),
417 "Received %s on stored fd %d (%s), closing.",
418 revents & EPOLLERR ? "EPOLLERR" : "EPOLLHUP",
419 fs->fd, strna(fs->fdname));
420 service_fd_store_unlink(fs);
421 return 0;
422 }
423
424 static int service_add_fd_store(Service *s, int fd, const char *name) {
425 ServiceFDStore *fs;
426 int r;
427
428 /* fd is always consumed if we return >= 0 */
429
430 assert(s);
431 assert(fd >= 0);
432
433 if (s->n_fd_store >= s->n_fd_store_max)
434 return -EXFULL; /* Our store is full.
435 * Use this errno rather than E[NM]FILE to distinguish from
436 * the case where systemd itself hits the file limit. */
437
438 LIST_FOREACH(fd_store, fs, s->fd_store) {
439 r = same_fd(fs->fd, fd);
440 if (r < 0)
441 return r;
442 if (r > 0) {
443 safe_close(fd);
444 return 0; /* fd already included */
445 }
446 }
447
448 fs = new0(ServiceFDStore, 1);
449 if (!fs)
450 return -ENOMEM;
451
452 fs->fd = fd;
453 fs->service = s;
454 fs->fdname = strdup(name ?: "stored");
455 if (!fs->fdname) {
456 free(fs);
457 return -ENOMEM;
458 }
459
460 r = sd_event_add_io(UNIT(s)->manager->event, &fs->event_source, fd, 0, on_fd_store_io, fs);
461 if (r < 0 && r != -EPERM) { /* EPERM indicates fds that aren't pollable, which is OK */
462 free(fs->fdname);
463 free(fs);
464 return r;
465 } else if (r >= 0)
466 (void) sd_event_source_set_description(fs->event_source, "service-fd-store");
467
468 LIST_PREPEND(fd_store, s->fd_store, fs);
469 s->n_fd_store++;
470
471 return 1; /* fd newly stored */
472 }
473
474 static int service_add_fd_store_set(Service *s, FDSet *fds, const char *name) {
475 int r;
476
477 assert(s);
478
479 while (fdset_size(fds) > 0) {
480 _cleanup_close_ int fd = -1;
481
482 fd = fdset_steal_first(fds);
483 if (fd < 0)
484 break;
485
486 r = service_add_fd_store(s, fd, name);
487 if (r == -EXFULL)
488 return log_unit_warning_errno(UNIT(s), r,
489 "Cannot store more fds than FileDescriptorStoreMax=%u, closing remaining.",
490 s->n_fd_store_max);
491 if (r < 0)
492 return log_unit_error_errno(UNIT(s), r, "Failed to add fd to store: %m");
493 if (r > 0)
494 log_unit_debug(UNIT(s), "Added fd %u (%s) to fd store.", fd, strna(name));
495 fd = -1;
496 }
497
498 return 0;
499 }
500
501 static void service_remove_fd_store(Service *s, const char *name) {
502 ServiceFDStore *fs, *n;
503
504 assert(s);
505 assert(name);
506
507 LIST_FOREACH_SAFE(fd_store, fs, n, s->fd_store) {
508 if (!streq(fs->fdname, name))
509 continue;
510
511 log_unit_debug(UNIT(s), "Got explicit request to remove fd %i (%s), closing.", fs->fd, name);
512 service_fd_store_unlink(fs);
513 }
514 }
515
516 static int service_arm_timer(Service *s, usec_t usec) {
517 int r;
518
519 assert(s);
520
521 if (s->timer_event_source) {
522 r = sd_event_source_set_time(s->timer_event_source, usec);
523 if (r < 0)
524 return r;
525
526 return sd_event_source_set_enabled(s->timer_event_source, SD_EVENT_ONESHOT);
527 }
528
529 if (usec == USEC_INFINITY)
530 return 0;
531
532 r = sd_event_add_time(
533 UNIT(s)->manager->event,
534 &s->timer_event_source,
535 CLOCK_MONOTONIC,
536 usec, 0,
537 service_dispatch_timer, s);
538 if (r < 0)
539 return r;
540
541 (void) sd_event_source_set_description(s->timer_event_source, "service-timer");
542
543 return 0;
544 }
545
546 static int service_verify(Service *s) {
547 assert(s);
548
549 if (UNIT(s)->load_state != UNIT_LOADED)
550 return 0;
551
552 if (!s->exec_command[SERVICE_EXEC_START] && !s->exec_command[SERVICE_EXEC_STOP]
553 && UNIT(s)->success_action == EMERGENCY_ACTION_NONE) {
554 /* FailureAction= only makes sense if one of the start or stop commands is specified.
555 * SuccessAction= will be executed unconditionally if no commands are specified. Hence,
556 * either a command or SuccessAction= are required. */
557
558 log_unit_error(UNIT(s), "Service has no ExecStart=, ExecStop=, or SuccessAction=. Refusing.");
559 return -ENOEXEC;
560 }
561
562 if (s->type != SERVICE_ONESHOT && !s->exec_command[SERVICE_EXEC_START]) {
563 log_unit_error(UNIT(s), "Service has no ExecStart= setting, which is only allowed for Type=oneshot services. Refusing.");
564 return -ENOEXEC;
565 }
566
567 if (!s->remain_after_exit && !s->exec_command[SERVICE_EXEC_START] && UNIT(s)->success_action == EMERGENCY_ACTION_NONE) {
568 log_unit_error(UNIT(s), "Service has no ExecStart= and no SuccessAction= settings and does not have RemainAfterExit=yes set. Refusing.");
569 return -ENOEXEC;
570 }
571
572 if (s->type != SERVICE_ONESHOT && s->exec_command[SERVICE_EXEC_START]->command_next) {
573 log_unit_error(UNIT(s), "Service has more than one ExecStart= setting, which is only allowed for Type=oneshot services. Refusing.");
574 return -ENOEXEC;
575 }
576
577 if (s->type == SERVICE_ONESHOT && s->restart != SERVICE_RESTART_NO) {
578 log_unit_error(UNIT(s), "Service has Restart= setting other than no, which isn't allowed for Type=oneshot services. Refusing.");
579 return -ENOEXEC;
580 }
581
582 if (s->type == SERVICE_ONESHOT && !exit_status_set_is_empty(&s->restart_force_status)) {
583 log_unit_error(UNIT(s), "Service has RestartForceStatus= set, which isn't allowed for Type=oneshot services. Refusing.");
584 return -ENOEXEC;
585 }
586
587 if (s->type == SERVICE_DBUS && !s->bus_name) {
588 log_unit_error(UNIT(s), "Service is of type D-Bus but no D-Bus service name has been specified. Refusing.");
589 return -ENOEXEC;
590 }
591
592 if (s->bus_name && s->type != SERVICE_DBUS)
593 log_unit_warning(UNIT(s), "Service has a D-Bus service name specified, but is not of type dbus. Ignoring.");
594
595 if (s->exec_context.pam_name && !IN_SET(s->kill_context.kill_mode, KILL_CONTROL_GROUP, KILL_MIXED)) {
596 log_unit_error(UNIT(s), "Service has PAM enabled. Kill mode must be set to 'control-group' or 'mixed'. Refusing.");
597 return -ENOEXEC;
598 }
599
600 if (s->usb_function_descriptors && !s->usb_function_strings)
601 log_unit_warning(UNIT(s), "Service has USBFunctionDescriptors= setting, but no USBFunctionStrings=. Ignoring.");
602
603 if (!s->usb_function_descriptors && s->usb_function_strings)
604 log_unit_warning(UNIT(s), "Service has USBFunctionStrings= setting, but no USBFunctionDescriptors=. Ignoring.");
605
606 if (s->runtime_max_usec != USEC_INFINITY && s->type == SERVICE_ONESHOT)
607 log_unit_warning(UNIT(s), "MaxRuntimeSec= has no effect in combination with Type=oneshot. Ignoring.");
608
609 return 0;
610 }
611
612 static int service_add_default_dependencies(Service *s) {
613 int r;
614
615 assert(s);
616
617 if (!UNIT(s)->default_dependencies)
618 return 0;
619
620 /* Add a number of automatic dependencies useful for the
621 * majority of services. */
622
623 if (MANAGER_IS_SYSTEM(UNIT(s)->manager)) {
624 /* First, pull in the really early boot stuff, and
625 * require it, so that we fail if we can't acquire
626 * it. */
627
628 r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SYSINIT_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
629 if (r < 0)
630 return r;
631 } else {
632
633 /* In the --user instance there's no sysinit.target,
634 * in that case require basic.target instead. */
635
636 r = unit_add_dependency_by_name(UNIT(s), UNIT_REQUIRES, SPECIAL_BASIC_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
637 if (r < 0)
638 return r;
639 }
640
641 /* Second, if the rest of the base system is in the same
642 * transaction, order us after it, but do not pull it in or
643 * even require it. */
644 r = unit_add_dependency_by_name(UNIT(s), UNIT_AFTER, SPECIAL_BASIC_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
645 if (r < 0)
646 return r;
647
648 /* Third, add us in for normal shutdown. */
649 return unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, true, UNIT_DEPENDENCY_DEFAULT);
650 }
651
652 static void service_fix_output(Service *s) {
653 assert(s);
654
655 /* If nothing has been explicitly configured, patch default output in. If input is socket/tty we avoid this
656 * however, since in that case we want output to default to the same place as we read input from. */
657
658 if (s->exec_context.std_error == EXEC_OUTPUT_INHERIT &&
659 s->exec_context.std_output == EXEC_OUTPUT_INHERIT &&
660 s->exec_context.std_input == EXEC_INPUT_NULL)
661 s->exec_context.std_error = UNIT(s)->manager->default_std_error;
662
663 if (s->exec_context.std_output == EXEC_OUTPUT_INHERIT &&
664 s->exec_context.std_input == EXEC_INPUT_NULL)
665 s->exec_context.std_output = UNIT(s)->manager->default_std_output;
666
667 if (s->exec_context.std_input == EXEC_INPUT_NULL &&
668 s->exec_context.stdin_data_size > 0)
669 s->exec_context.std_input = EXEC_INPUT_DATA;
670 }
671
672 static int service_setup_bus_name(Service *s) {
673 int r;
674
675 assert(s);
676
677 if (!s->bus_name)
678 return 0;
679
680 r = unit_add_dependency_by_name(UNIT(s), UNIT_REQUIRES, SPECIAL_DBUS_SOCKET, true, UNIT_DEPENDENCY_FILE);
681 if (r < 0)
682 return log_unit_error_errno(UNIT(s), r, "Failed to add dependency on " SPECIAL_DBUS_SOCKET ": %m");
683
684 /* We always want to be ordered against dbus.socket if both are in the transaction. */
685 r = unit_add_dependency_by_name(UNIT(s), UNIT_AFTER, SPECIAL_DBUS_SOCKET, true, UNIT_DEPENDENCY_FILE);
686 if (r < 0)
687 return log_unit_error_errno(UNIT(s), r, "Failed to add dependency on " SPECIAL_DBUS_SOCKET ": %m");
688
689 r = unit_watch_bus_name(UNIT(s), s->bus_name);
690 if (r == -EEXIST)
691 return log_unit_error_errno(UNIT(s), r, "Two services allocated for the same bus name %s, refusing operation.", s->bus_name);
692 if (r < 0)
693 return log_unit_error_errno(UNIT(s), r, "Cannot watch bus name %s: %m", s->bus_name);
694
695 return 0;
696 }
697
698 static int service_add_extras(Service *s) {
699 int r;
700
701 assert(s);
702
703 if (s->type == _SERVICE_TYPE_INVALID) {
704 /* Figure out a type automatically */
705 if (s->bus_name)
706 s->type = SERVICE_DBUS;
707 else if (s->exec_command[SERVICE_EXEC_START])
708 s->type = SERVICE_SIMPLE;
709 else
710 s->type = SERVICE_ONESHOT;
711 }
712
713 /* Oneshot services have disabled start timeout by default */
714 if (s->type == SERVICE_ONESHOT && !s->start_timeout_defined)
715 s->timeout_start_usec = USEC_INFINITY;
716
717 service_fix_output(s);
718
719 r = unit_patch_contexts(UNIT(s));
720 if (r < 0)
721 return r;
722
723 r = unit_add_exec_dependencies(UNIT(s), &s->exec_context);
724 if (r < 0)
725 return r;
726
727 r = unit_set_default_slice(UNIT(s));
728 if (r < 0)
729 return r;
730
731 /* If the service needs the notify socket, let's enable it automatically. */
732 if (s->notify_access == NOTIFY_NONE &&
733 (s->type == SERVICE_NOTIFY || s->watchdog_usec > 0 || s->n_fd_store_max > 0))
734 s->notify_access = NOTIFY_MAIN;
735
736 r = service_add_default_dependencies(s);
737 if (r < 0)
738 return r;
739
740 r = service_setup_bus_name(s);
741 if (r < 0)
742 return r;
743
744 return 0;
745 }
746
747 static int service_load(Unit *u) {
748 Service *s = SERVICE(u);
749 int r;
750
751 assert(s);
752
753 /* Load a .service file */
754 r = unit_load_fragment(u);
755 if (r < 0)
756 return r;
757
758 /* Still nothing found? Then let's give up */
759 if (u->load_state == UNIT_STUB)
760 return -ENOENT;
761
762 /* This is a new unit? Then let's add in some extras */
763 if (u->load_state == UNIT_LOADED) {
764
765 /* We were able to load something, then let's add in
766 * the dropin directories. */
767 r = unit_load_dropin(u);
768 if (r < 0)
769 return r;
770
771 /* This is a new unit? Then let's add in some
772 * extras */
773 r = service_add_extras(s);
774 if (r < 0)
775 return r;
776 }
777
778 return service_verify(s);
779 }
780
781 static void service_dump(Unit *u, FILE *f, const char *prefix) {
782 char buf_restart[FORMAT_TIMESPAN_MAX], buf_start[FORMAT_TIMESPAN_MAX], buf_stop[FORMAT_TIMESPAN_MAX];
783 char buf_runtime[FORMAT_TIMESPAN_MAX], buf_watchdog[FORMAT_TIMESPAN_MAX];
784 ServiceExecCommand c;
785 Service *s = SERVICE(u);
786 const char *prefix2;
787
788 assert(s);
789
790 prefix = strempty(prefix);
791 prefix2 = strjoina(prefix, "\t");
792
793 fprintf(f,
794 "%sService State: %s\n"
795 "%sResult: %s\n"
796 "%sReload Result: %s\n"
797 "%sPermissionsStartOnly: %s\n"
798 "%sRootDirectoryStartOnly: %s\n"
799 "%sRemainAfterExit: %s\n"
800 "%sGuessMainPID: %s\n"
801 "%sType: %s\n"
802 "%sRestart: %s\n"
803 "%sNotifyAccess: %s\n"
804 "%sNotifyState: %s\n",
805 prefix, service_state_to_string(s->state),
806 prefix, service_result_to_string(s->result),
807 prefix, service_result_to_string(s->reload_result),
808 prefix, yes_no(s->permissions_start_only),
809 prefix, yes_no(s->root_directory_start_only),
810 prefix, yes_no(s->remain_after_exit),
811 prefix, yes_no(s->guess_main_pid),
812 prefix, service_type_to_string(s->type),
813 prefix, service_restart_to_string(s->restart),
814 prefix, notify_access_to_string(s->notify_access),
815 prefix, notify_state_to_string(s->notify_state));
816
817 if (s->control_pid > 0)
818 fprintf(f,
819 "%sControl PID: "PID_FMT"\n",
820 prefix, s->control_pid);
821
822 if (s->main_pid > 0)
823 fprintf(f,
824 "%sMain PID: "PID_FMT"\n"
825 "%sMain PID Known: %s\n"
826 "%sMain PID Alien: %s\n",
827 prefix, s->main_pid,
828 prefix, yes_no(s->main_pid_known),
829 prefix, yes_no(s->main_pid_alien));
830
831 if (s->pid_file)
832 fprintf(f,
833 "%sPIDFile: %s\n",
834 prefix, s->pid_file);
835
836 if (s->bus_name)
837 fprintf(f,
838 "%sBusName: %s\n"
839 "%sBus Name Good: %s\n",
840 prefix, s->bus_name,
841 prefix, yes_no(s->bus_name_good));
842
843 if (UNIT_ISSET(s->accept_socket))
844 fprintf(f,
845 "%sAccept Socket: %s\n",
846 prefix, UNIT_DEREF(s->accept_socket)->id);
847
848 fprintf(f,
849 "%sRestartSec: %s\n"
850 "%sTimeoutStartSec: %s\n"
851 "%sTimeoutStopSec: %s\n"
852 "%sRuntimeMaxSec: %s\n"
853 "%sWatchdogSec: %s\n",
854 prefix, format_timespan(buf_restart, sizeof(buf_restart), s->restart_usec, USEC_PER_SEC),
855 prefix, format_timespan(buf_start, sizeof(buf_start), s->timeout_start_usec, USEC_PER_SEC),
856 prefix, format_timespan(buf_stop, sizeof(buf_stop), s->timeout_stop_usec, USEC_PER_SEC),
857 prefix, format_timespan(buf_runtime, sizeof(buf_runtime), s->runtime_max_usec, USEC_PER_SEC),
858 prefix, format_timespan(buf_watchdog, sizeof(buf_watchdog), s->watchdog_usec, USEC_PER_SEC));
859
860 kill_context_dump(&s->kill_context, f, prefix);
861 exec_context_dump(&s->exec_context, f, prefix);
862
863 for (c = 0; c < _SERVICE_EXEC_COMMAND_MAX; c++) {
864
865 if (!s->exec_command[c])
866 continue;
867
868 fprintf(f, "%s-> %s:\n",
869 prefix, service_exec_command_to_string(c));
870
871 exec_command_dump_list(s->exec_command[c], f, prefix2);
872 }
873
874 if (s->status_text)
875 fprintf(f, "%sStatus Text: %s\n",
876 prefix, s->status_text);
877
878 if (s->n_fd_store_max > 0)
879 fprintf(f,
880 "%sFile Descriptor Store Max: %u\n"
881 "%sFile Descriptor Store Current: %zu\n",
882 prefix, s->n_fd_store_max,
883 prefix, s->n_fd_store);
884
885 cgroup_context_dump(&s->cgroup_context, f, prefix);
886 }
887
888 static int service_is_suitable_main_pid(Service *s, pid_t pid, int prio) {
889 Unit *owner;
890
891 assert(s);
892 assert(pid_is_valid(pid));
893
894 /* Checks whether the specified PID is suitable as main PID for this service. returns negative if not, 0 if the
895 * PID is questionnable but should be accepted if the source of configuration is trusted. > 0 if the PID is
896 * good */
897
898 if (pid == getpid_cached() || pid == 1) {
899 log_unit_full(UNIT(s), prio, 0, "New main PID "PID_FMT" is the manager, refusing.", pid);
900 return -EPERM;
901 }
902
903 if (pid == s->control_pid) {
904 log_unit_full(UNIT(s), prio, 0, "New main PID "PID_FMT" is the control process, refusing.", pid);
905 return -EPERM;
906 }
907
908 if (!pid_is_alive(pid)) {
909 log_unit_full(UNIT(s), prio, 0, "New main PID "PID_FMT" does not exist or is a zombie.", pid);
910 return -ESRCH;
911 }
912
913 owner = manager_get_unit_by_pid(UNIT(s)->manager, pid);
914 if (owner == UNIT(s)) {
915 log_unit_debug(UNIT(s), "New main PID "PID_FMT" belongs to service, we are happy.", pid);
916 return 1; /* Yay, it's definitely a good PID */
917 }
918
919 return 0; /* Hmm it's a suspicious PID, let's accept it if configuration source is trusted */
920 }
921
922 static int service_load_pid_file(Service *s, bool may_warn) {
923 char procfs[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
924 bool questionable_pid_file = false;
925 _cleanup_free_ char *k = NULL;
926 _cleanup_close_ int fd = -1;
927 int r, prio;
928 pid_t pid;
929
930 assert(s);
931
932 if (!s->pid_file)
933 return -ENOENT;
934
935 prio = may_warn ? LOG_INFO : LOG_DEBUG;
936
937 fd = chase_symlinks(s->pid_file, NULL, CHASE_OPEN|CHASE_SAFE, NULL);
938 if (fd == -ENOLINK) {
939 log_unit_full(UNIT(s), LOG_DEBUG, fd, "Potentially unsafe symlink chain, will now retry with relaxed checks: %s", s->pid_file);
940
941 questionable_pid_file = true;
942
943 fd = chase_symlinks(s->pid_file, NULL, CHASE_OPEN, NULL);
944 }
945 if (fd < 0)
946 return log_unit_full(UNIT(s), prio, fd, "Can't open PID file %s (yet?) after %s: %m", s->pid_file, service_state_to_string(s->state));
947
948 /* Let's read the PID file now that we chased it down. But we need to convert the O_PATH fd chase_symlinks() returned us into a proper fd first. */
949 xsprintf(procfs, "/proc/self/fd/%i", fd);
950 r = read_one_line_file(procfs, &k);
951 if (r < 0)
952 return log_unit_error_errno(UNIT(s), r, "Can't convert PID files %s O_PATH file descriptor to proper file descriptor: %m", s->pid_file);
953
954 r = parse_pid(k, &pid);
955 if (r < 0)
956 return log_unit_full(UNIT(s), prio, r, "Failed to parse PID from file %s: %m", s->pid_file);
957
958 if (s->main_pid_known && pid == s->main_pid)
959 return 0;
960
961 r = service_is_suitable_main_pid(s, pid, prio);
962 if (r < 0)
963 return r;
964 if (r == 0) {
965 struct stat st;
966
967 if (questionable_pid_file) {
968 log_unit_error(UNIT(s), "Refusing to accept PID outside of service control group, acquired through unsafe symlink chain: %s", s->pid_file);
969 return -EPERM;
970 }
971
972 /* Hmm, it's not clear if the new main PID is safe. Let's allow this if the PID file is owned by root */
973
974 if (fstat(fd, &st) < 0)
975 return log_unit_error_errno(UNIT(s), errno, "Failed to fstat() PID file O_PATH fd: %m");
976
977 if (st.st_uid != 0) {
978 log_unit_error(UNIT(s), "New main PID "PID_FMT" does not belong to service, and PID file is not owned by root. Refusing.", pid);
979 return -EPERM;
980 }
981
982 log_unit_debug(UNIT(s), "New main PID "PID_FMT" does not belong to service, but we'll accept it since PID file is owned by root.", pid);
983 }
984
985 if (s->main_pid_known) {
986 log_unit_debug(UNIT(s), "Main PID changing: "PID_FMT" -> "PID_FMT, s->main_pid, pid);
987
988 service_unwatch_main_pid(s);
989 s->main_pid_known = false;
990 } else
991 log_unit_debug(UNIT(s), "Main PID loaded: "PID_FMT, pid);
992
993 r = service_set_main_pid(s, pid);
994 if (r < 0)
995 return r;
996
997 r = unit_watch_pid(UNIT(s), pid);
998 if (r < 0) /* FIXME: we need to do something here */
999 return log_unit_warning_errno(UNIT(s), r, "Failed to watch PID "PID_FMT" for service: %m", pid);
1000
1001 return 1;
1002 }
1003
1004 static void service_search_main_pid(Service *s) {
1005 pid_t pid = 0;
1006 int r;
1007
1008 assert(s);
1009
1010 /* If we know it anyway, don't ever fallback to unreliable
1011 * heuristics */
1012 if (s->main_pid_known)
1013 return;
1014
1015 if (!s->guess_main_pid)
1016 return;
1017
1018 assert(s->main_pid <= 0);
1019
1020 if (unit_search_main_pid(UNIT(s), &pid) < 0)
1021 return;
1022
1023 log_unit_debug(UNIT(s), "Main PID guessed: "PID_FMT, pid);
1024 if (service_set_main_pid(s, pid) < 0)
1025 return;
1026
1027 r = unit_watch_pid(UNIT(s), pid);
1028 if (r < 0)
1029 /* FIXME: we need to do something here */
1030 log_unit_warning_errno(UNIT(s), r, "Failed to watch PID "PID_FMT" from: %m", pid);
1031 }
1032
1033 static void service_set_state(Service *s, ServiceState state) {
1034 ServiceState old_state;
1035 const UnitActiveState *table;
1036
1037 assert(s);
1038
1039 if (s->state != state)
1040 bus_unit_send_pending_change_signal(UNIT(s), false);
1041
1042 table = s->type == SERVICE_IDLE ? state_translation_table_idle : state_translation_table;
1043
1044 old_state = s->state;
1045 s->state = state;
1046
1047 service_unwatch_pid_file(s);
1048
1049 if (!IN_SET(state,
1050 SERVICE_START_PRE, SERVICE_START, SERVICE_START_POST,
1051 SERVICE_RUNNING,
1052 SERVICE_RELOAD,
1053 SERVICE_STOP, SERVICE_STOP_WATCHDOG, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL, SERVICE_STOP_POST,
1054 SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL,
1055 SERVICE_AUTO_RESTART))
1056 s->timer_event_source = sd_event_source_unref(s->timer_event_source);
1057
1058 if (!IN_SET(state,
1059 SERVICE_START, SERVICE_START_POST,
1060 SERVICE_RUNNING, SERVICE_RELOAD,
1061 SERVICE_STOP, SERVICE_STOP_WATCHDOG, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL, SERVICE_STOP_POST,
1062 SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL)) {
1063 service_unwatch_main_pid(s);
1064 s->main_command = NULL;
1065 }
1066
1067 if (!IN_SET(state,
1068 SERVICE_START_PRE, SERVICE_START, SERVICE_START_POST,
1069 SERVICE_RELOAD,
1070 SERVICE_STOP, SERVICE_STOP_WATCHDOG, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL, SERVICE_STOP_POST,
1071 SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL)) {
1072 service_unwatch_control_pid(s);
1073 s->control_command = NULL;
1074 s->control_command_id = _SERVICE_EXEC_COMMAND_INVALID;
1075 }
1076
1077 if (IN_SET(state, SERVICE_DEAD, SERVICE_FAILED, SERVICE_AUTO_RESTART)) {
1078 unit_unwatch_all_pids(UNIT(s));
1079 unit_dequeue_rewatch_pids(UNIT(s));
1080 }
1081
1082 if (!IN_SET(state,
1083 SERVICE_START_PRE, SERVICE_START, SERVICE_START_POST,
1084 SERVICE_RUNNING, SERVICE_RELOAD,
1085 SERVICE_STOP, SERVICE_STOP_WATCHDOG, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL, SERVICE_STOP_POST,
1086 SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL) &&
1087 !(state == SERVICE_DEAD && UNIT(s)->job))
1088 service_close_socket_fd(s);
1089
1090 if (state != SERVICE_START)
1091 s->exec_fd_event_source = sd_event_source_unref(s->exec_fd_event_source);
1092
1093 if (!IN_SET(state, SERVICE_START_POST, SERVICE_RUNNING, SERVICE_RELOAD))
1094 service_stop_watchdog(s);
1095
1096 /* For the inactive states unit_notify() will trim the cgroup,
1097 * but for exit we have to do that ourselves... */
1098 if (state == SERVICE_EXITED && !MANAGER_IS_RELOADING(UNIT(s)->manager))
1099 unit_prune_cgroup(UNIT(s));
1100
1101 if (old_state != state)
1102 log_unit_debug(UNIT(s), "Changed %s -> %s", service_state_to_string(old_state), service_state_to_string(state));
1103
1104 unit_notify(UNIT(s), table[old_state], table[state],
1105 (s->reload_result == SERVICE_SUCCESS ? 0 : UNIT_NOTIFY_RELOAD_FAILURE) |
1106 (s->will_auto_restart ? UNIT_NOTIFY_WILL_AUTO_RESTART : 0));
1107 }
1108
1109 static usec_t service_coldplug_timeout(Service *s) {
1110 assert(s);
1111
1112 switch (s->deserialized_state) {
1113
1114 case SERVICE_START_PRE:
1115 case SERVICE_START:
1116 case SERVICE_START_POST:
1117 case SERVICE_RELOAD:
1118 return usec_add(UNIT(s)->state_change_timestamp.monotonic, s->timeout_start_usec);
1119
1120 case SERVICE_RUNNING:
1121 return usec_add(UNIT(s)->active_enter_timestamp.monotonic, s->runtime_max_usec);
1122
1123 case SERVICE_STOP:
1124 case SERVICE_STOP_WATCHDOG:
1125 case SERVICE_STOP_SIGTERM:
1126 case SERVICE_STOP_SIGKILL:
1127 case SERVICE_STOP_POST:
1128 case SERVICE_FINAL_SIGTERM:
1129 case SERVICE_FINAL_SIGKILL:
1130 return usec_add(UNIT(s)->state_change_timestamp.monotonic, s->timeout_stop_usec);
1131
1132 case SERVICE_AUTO_RESTART:
1133 return usec_add(UNIT(s)->inactive_enter_timestamp.monotonic, s->restart_usec);
1134
1135 default:
1136 return USEC_INFINITY;
1137 }
1138 }
1139
1140 static int service_coldplug(Unit *u) {
1141 Service *s = SERVICE(u);
1142 int r;
1143
1144 assert(s);
1145 assert(s->state == SERVICE_DEAD);
1146
1147 if (s->deserialized_state == s->state)
1148 return 0;
1149
1150 r = service_arm_timer(s, service_coldplug_timeout(s));
1151 if (r < 0)
1152 return r;
1153
1154 if (s->main_pid > 0 &&
1155 pid_is_unwaited(s->main_pid) &&
1156 (IN_SET(s->deserialized_state,
1157 SERVICE_START, SERVICE_START_POST,
1158 SERVICE_RUNNING, SERVICE_RELOAD,
1159 SERVICE_STOP, SERVICE_STOP_WATCHDOG, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL, SERVICE_STOP_POST,
1160 SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL))) {
1161 r = unit_watch_pid(UNIT(s), s->main_pid);
1162 if (r < 0)
1163 return r;
1164 }
1165
1166 if (s->control_pid > 0 &&
1167 pid_is_unwaited(s->control_pid) &&
1168 IN_SET(s->deserialized_state,
1169 SERVICE_START_PRE, SERVICE_START, SERVICE_START_POST,
1170 SERVICE_RELOAD,
1171 SERVICE_STOP, SERVICE_STOP_WATCHDOG, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL, SERVICE_STOP_POST,
1172 SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL)) {
1173 r = unit_watch_pid(UNIT(s), s->control_pid);
1174 if (r < 0)
1175 return r;
1176 }
1177
1178 if (!IN_SET(s->deserialized_state, SERVICE_DEAD, SERVICE_FAILED, SERVICE_AUTO_RESTART)) {
1179 (void) unit_enqueue_rewatch_pids(u);
1180 (void) unit_setup_dynamic_creds(u);
1181 (void) unit_setup_exec_runtime(u);
1182 }
1183
1184 if (IN_SET(s->deserialized_state, SERVICE_START_POST, SERVICE_RUNNING, SERVICE_RELOAD))
1185 service_start_watchdog(s);
1186
1187 if (UNIT_ISSET(s->accept_socket)) {
1188 Socket* socket = SOCKET(UNIT_DEREF(s->accept_socket));
1189
1190 if (socket->max_connections_per_source > 0) {
1191 SocketPeer *peer;
1192
1193 /* Make a best-effort attempt at bumping the connection count */
1194 if (socket_acquire_peer(socket, s->socket_fd, &peer) > 0) {
1195 socket_peer_unref(s->peer);
1196 s->peer = peer;
1197 }
1198 }
1199 }
1200
1201 service_set_state(s, s->deserialized_state);
1202 return 0;
1203 }
1204
1205 static int service_collect_fds(
1206 Service *s,
1207 int **fds,
1208 char ***fd_names,
1209 size_t *n_socket_fds,
1210 size_t *n_storage_fds) {
1211
1212 _cleanup_strv_free_ char **rfd_names = NULL;
1213 _cleanup_free_ int *rfds = NULL;
1214 size_t rn_socket_fds = 0, rn_storage_fds = 0;
1215 int r;
1216
1217 assert(s);
1218 assert(fds);
1219 assert(fd_names);
1220 assert(n_socket_fds);
1221 assert(n_storage_fds);
1222
1223 if (s->socket_fd >= 0) {
1224
1225 /* Pass the per-connection socket */
1226
1227 rfds = new(int, 1);
1228 if (!rfds)
1229 return -ENOMEM;
1230 rfds[0] = s->socket_fd;
1231
1232 rfd_names = strv_new("connection");
1233 if (!rfd_names)
1234 return -ENOMEM;
1235
1236 rn_socket_fds = 1;
1237 } else {
1238 Iterator i;
1239 void *v;
1240 Unit *u;
1241
1242 /* Pass all our configured sockets for singleton services */
1243
1244 HASHMAP_FOREACH_KEY(v, u, UNIT(s)->dependencies[UNIT_TRIGGERED_BY], i) {
1245 _cleanup_free_ int *cfds = NULL;
1246 Socket *sock;
1247 int cn_fds;
1248
1249 if (u->type != UNIT_SOCKET)
1250 continue;
1251
1252 sock = SOCKET(u);
1253
1254 cn_fds = socket_collect_fds(sock, &cfds);
1255 if (cn_fds < 0)
1256 return cn_fds;
1257
1258 if (cn_fds <= 0)
1259 continue;
1260
1261 if (!rfds) {
1262 rfds = TAKE_PTR(cfds);
1263 rn_socket_fds = cn_fds;
1264 } else {
1265 int *t;
1266
1267 t = reallocarray(rfds, rn_socket_fds + cn_fds, sizeof(int));
1268 if (!t)
1269 return -ENOMEM;
1270
1271 memcpy(t + rn_socket_fds, cfds, cn_fds * sizeof(int));
1272
1273 rfds = t;
1274 rn_socket_fds += cn_fds;
1275 }
1276
1277 r = strv_extend_n(&rfd_names, socket_fdname(sock), cn_fds);
1278 if (r < 0)
1279 return r;
1280 }
1281 }
1282
1283 if (s->n_fd_store > 0) {
1284 ServiceFDStore *fs;
1285 size_t n_fds;
1286 char **nl;
1287 int *t;
1288
1289 t = reallocarray(rfds, rn_socket_fds + s->n_fd_store, sizeof(int));
1290 if (!t)
1291 return -ENOMEM;
1292
1293 rfds = t;
1294
1295 nl = reallocarray(rfd_names, rn_socket_fds + s->n_fd_store + 1, sizeof(char *));
1296 if (!nl)
1297 return -ENOMEM;
1298
1299 rfd_names = nl;
1300 n_fds = rn_socket_fds;
1301
1302 LIST_FOREACH(fd_store, fs, s->fd_store) {
1303 rfds[n_fds] = fs->fd;
1304 rfd_names[n_fds] = strdup(strempty(fs->fdname));
1305 if (!rfd_names[n_fds])
1306 return -ENOMEM;
1307
1308 rn_storage_fds++;
1309 n_fds++;
1310 }
1311
1312 rfd_names[n_fds] = NULL;
1313 }
1314
1315 *fds = TAKE_PTR(rfds);
1316 *fd_names = TAKE_PTR(rfd_names);
1317 *n_socket_fds = rn_socket_fds;
1318 *n_storage_fds = rn_storage_fds;
1319
1320 return 0;
1321 }
1322
1323 static int service_allocate_exec_fd_event_source(
1324 Service *s,
1325 int fd,
1326 sd_event_source **ret_event_source) {
1327
1328 _cleanup_(sd_event_source_unrefp) sd_event_source *source = NULL;
1329 int r;
1330
1331 assert(s);
1332 assert(fd >= 0);
1333 assert(ret_event_source);
1334
1335 r = sd_event_add_io(UNIT(s)->manager->event, &source, fd, 0, service_dispatch_exec_io, s);
1336 if (r < 0)
1337 return log_unit_error_errno(UNIT(s), r, "Failed to allocate exec_fd event source: %m");
1338
1339 /* This is a bit lower priority than SIGCHLD, as that carries a lot more interesting failure information */
1340
1341 r = sd_event_source_set_priority(source, SD_EVENT_PRIORITY_NORMAL-3);
1342 if (r < 0)
1343 return log_unit_error_errno(UNIT(s), r, "Failed to adjust priority of exec_fd event source: %m");
1344
1345 (void) sd_event_source_set_description(source, "service event_fd");
1346
1347 r = sd_event_source_set_io_fd_own(source, true);
1348 if (r < 0)
1349 return log_unit_error_errno(UNIT(s), r, "Failed to pass ownership of fd to event source: %m");
1350
1351 *ret_event_source = TAKE_PTR(source);
1352 return 0;
1353 }
1354
1355 static int service_allocate_exec_fd(
1356 Service *s,
1357 sd_event_source **ret_event_source,
1358 int* ret_exec_fd) {
1359
1360 _cleanup_close_pair_ int p[2] = { -1, -1 };
1361 int r;
1362
1363 assert(s);
1364 assert(ret_event_source);
1365 assert(ret_exec_fd);
1366
1367 if (pipe2(p, O_CLOEXEC|O_NONBLOCK) < 0)
1368 return log_unit_error_errno(UNIT(s), errno, "Failed to allocate exec_fd pipe: %m");
1369
1370 r = service_allocate_exec_fd_event_source(s, p[0], ret_event_source);
1371 if (r < 0)
1372 return r;
1373
1374 p[0] = -1;
1375 *ret_exec_fd = TAKE_FD(p[1]);
1376
1377 return 0;
1378 }
1379
1380 static bool service_exec_needs_notify_socket(Service *s, ExecFlags flags) {
1381 assert(s);
1382
1383 /* Notifications are accepted depending on the process and
1384 * the access setting of the service:
1385 * process: \ access: NONE MAIN EXEC ALL
1386 * main no yes yes yes
1387 * control no no yes yes
1388 * other (forked) no no no yes */
1389
1390 if (flags & EXEC_IS_CONTROL)
1391 /* A control process */
1392 return IN_SET(s->notify_access, NOTIFY_EXEC, NOTIFY_ALL);
1393
1394 /* We only spawn main processes and control processes, so any
1395 * process that is not a control process is a main process */
1396 return s->notify_access != NOTIFY_NONE;
1397 }
1398
1399 static int service_spawn(
1400 Service *s,
1401 ExecCommand *c,
1402 usec_t timeout,
1403 ExecFlags flags,
1404 pid_t *_pid) {
1405
1406 _cleanup_(exec_params_clear) ExecParameters exec_params = {
1407 .flags = flags,
1408 .stdin_fd = -1,
1409 .stdout_fd = -1,
1410 .stderr_fd = -1,
1411 .exec_fd = -1,
1412 };
1413 _cleanup_strv_free_ char **final_env = NULL, **our_env = NULL, **fd_names = NULL;
1414 _cleanup_(sd_event_source_unrefp) sd_event_source *exec_fd_source = NULL;
1415 size_t n_socket_fds = 0, n_storage_fds = 0, n_env = 0;
1416 _cleanup_close_ int exec_fd = -1;
1417 _cleanup_free_ int *fds = NULL;
1418 pid_t pid;
1419 int r;
1420
1421 assert(s);
1422 assert(c);
1423 assert(_pid);
1424
1425 r = unit_prepare_exec(UNIT(s)); /* This realizes the cgroup, among other things */
1426 if (r < 0)
1427 return r;
1428
1429 if (flags & EXEC_IS_CONTROL) {
1430 /* If this is a control process, mask the permissions/chroot application if this is requested. */
1431 if (s->permissions_start_only)
1432 exec_params.flags &= ~EXEC_APPLY_SANDBOXING;
1433 if (s->root_directory_start_only)
1434 exec_params.flags &= ~EXEC_APPLY_CHROOT;
1435 }
1436
1437 if ((flags & EXEC_PASS_FDS) ||
1438 s->exec_context.std_input == EXEC_INPUT_SOCKET ||
1439 s->exec_context.std_output == EXEC_OUTPUT_SOCKET ||
1440 s->exec_context.std_error == EXEC_OUTPUT_SOCKET) {
1441
1442 r = service_collect_fds(s, &fds, &fd_names, &n_socket_fds, &n_storage_fds);
1443 if (r < 0)
1444 return r;
1445
1446 log_unit_debug(UNIT(s), "Passing %zu fds to service", n_socket_fds + n_storage_fds);
1447 }
1448
1449 if (!FLAGS_SET(flags, EXEC_IS_CONTROL) && s->type == SERVICE_EXEC) {
1450 assert(!s->exec_fd_event_source);
1451
1452 r = service_allocate_exec_fd(s, &exec_fd_source, &exec_fd);
1453 if (r < 0)
1454 return r;
1455 }
1456
1457 r = service_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), timeout));
1458 if (r < 0)
1459 return r;
1460
1461 our_env = new0(char*, 10);
1462 if (!our_env)
1463 return -ENOMEM;
1464
1465 if (service_exec_needs_notify_socket(s, flags))
1466 if (asprintf(our_env + n_env++, "NOTIFY_SOCKET=%s", UNIT(s)->manager->notify_socket) < 0)
1467 return -ENOMEM;
1468
1469 if (s->main_pid > 0)
1470 if (asprintf(our_env + n_env++, "MAINPID="PID_FMT, s->main_pid) < 0)
1471 return -ENOMEM;
1472
1473 if (MANAGER_IS_USER(UNIT(s)->manager))
1474 if (asprintf(our_env + n_env++, "MANAGERPID="PID_FMT, getpid_cached()) < 0)
1475 return -ENOMEM;
1476
1477 if (s->pid_file)
1478 if (asprintf(our_env + n_env++, "PIDFILE=%s", s->pid_file) < 0)
1479 return -ENOMEM;
1480
1481 if (s->socket_fd >= 0) {
1482 union sockaddr_union sa;
1483 socklen_t salen = sizeof(sa);
1484
1485 /* If this is a per-connection service instance, let's set $REMOTE_ADDR and $REMOTE_PORT to something
1486 * useful. Note that we do this only when we are still connected at this point in time, which we might
1487 * very well not be. Hence we ignore all errors when retrieving peer information (as that might result
1488 * in ENOTCONN), and just use whate we can use. */
1489
1490 if (getpeername(s->socket_fd, &sa.sa, &salen) >= 0 &&
1491 IN_SET(sa.sa.sa_family, AF_INET, AF_INET6, AF_VSOCK)) {
1492
1493 _cleanup_free_ char *addr = NULL;
1494 char *t;
1495 unsigned port;
1496
1497 r = sockaddr_pretty(&sa.sa, salen, true, false, &addr);
1498 if (r < 0)
1499 return r;
1500
1501 t = strappend("REMOTE_ADDR=", addr);
1502 if (!t)
1503 return -ENOMEM;
1504 our_env[n_env++] = t;
1505
1506 r = sockaddr_port(&sa.sa, &port);
1507 if (r < 0)
1508 return r;
1509
1510 if (asprintf(&t, "REMOTE_PORT=%u", port) < 0)
1511 return -ENOMEM;
1512 our_env[n_env++] = t;
1513 }
1514 }
1515
1516 if (flags & EXEC_SETENV_RESULT) {
1517 if (asprintf(our_env + n_env++, "SERVICE_RESULT=%s", service_result_to_string(s->result)) < 0)
1518 return -ENOMEM;
1519
1520 if (s->main_exec_status.pid > 0 &&
1521 dual_timestamp_is_set(&s->main_exec_status.exit_timestamp)) {
1522 if (asprintf(our_env + n_env++, "EXIT_CODE=%s", sigchld_code_to_string(s->main_exec_status.code)) < 0)
1523 return -ENOMEM;
1524
1525 if (s->main_exec_status.code == CLD_EXITED)
1526 r = asprintf(our_env + n_env++, "EXIT_STATUS=%i", s->main_exec_status.status);
1527 else
1528 r = asprintf(our_env + n_env++, "EXIT_STATUS=%s", signal_to_string(s->main_exec_status.status));
1529 if (r < 0)
1530 return -ENOMEM;
1531 }
1532 }
1533
1534 r = unit_set_exec_params(UNIT(s), &exec_params);
1535 if (r < 0)
1536 return r;
1537
1538 final_env = strv_env_merge(2, exec_params.environment, our_env, NULL);
1539 if (!final_env)
1540 return -ENOMEM;
1541
1542 /* System D-Bus needs nss-systemd disabled, so that we don't deadlock */
1543 SET_FLAG(exec_params.flags, EXEC_NSS_BYPASS_BUS,
1544 MANAGER_IS_SYSTEM(UNIT(s)->manager) && unit_has_name(UNIT(s), SPECIAL_DBUS_SERVICE));
1545
1546 strv_free_and_replace(exec_params.environment, final_env);
1547 exec_params.fds = fds;
1548 exec_params.fd_names = fd_names;
1549 exec_params.n_socket_fds = n_socket_fds;
1550 exec_params.n_storage_fds = n_storage_fds;
1551 exec_params.watchdog_usec = service_get_watchdog_usec(s);
1552 exec_params.selinux_context_net = s->socket_fd_selinux_context_net;
1553 if (s->type == SERVICE_IDLE)
1554 exec_params.idle_pipe = UNIT(s)->manager->idle_pipe;
1555 exec_params.stdin_fd = s->stdin_fd;
1556 exec_params.stdout_fd = s->stdout_fd;
1557 exec_params.stderr_fd = s->stderr_fd;
1558 exec_params.exec_fd = exec_fd;
1559
1560 r = exec_spawn(UNIT(s),
1561 c,
1562 &s->exec_context,
1563 &exec_params,
1564 s->exec_runtime,
1565 &s->dynamic_creds,
1566 &pid);
1567 if (r < 0)
1568 return r;
1569
1570 s->exec_fd_event_source = TAKE_PTR(exec_fd_source);
1571 s->exec_fd_hot = false;
1572
1573 r = unit_watch_pid(UNIT(s), pid);
1574 if (r < 0) /* FIXME: we need to do something here */
1575 return r;
1576
1577 *_pid = pid;
1578
1579 return 0;
1580 }
1581
1582 static int main_pid_good(Service *s) {
1583 assert(s);
1584
1585 /* Returns 0 if the pid is dead, > 0 if it is good, < 0 if we don't know */
1586
1587 /* If we know the pid file, then let's just check if it is
1588 * still valid */
1589 if (s->main_pid_known) {
1590
1591 /* If it's an alien child let's check if it is still
1592 * alive ... */
1593 if (s->main_pid_alien && s->main_pid > 0)
1594 return pid_is_alive(s->main_pid);
1595
1596 /* .. otherwise assume we'll get a SIGCHLD for it,
1597 * which we really should wait for to collect exit
1598 * status and code */
1599 return s->main_pid > 0;
1600 }
1601
1602 /* We don't know the pid */
1603 return -EAGAIN;
1604 }
1605
1606 static int control_pid_good(Service *s) {
1607 assert(s);
1608
1609 /* Returns 0 if the control PID is dead, > 0 if it is good. We never actually return < 0 here, but in order to
1610 * make this function as similar as possible to main_pid_good() and cgroup_good(), we pretend that < 0 also
1611 * means: we can't figure it out. */
1612
1613 return s->control_pid > 0;
1614 }
1615
1616 static int cgroup_good(Service *s) {
1617 int r;
1618
1619 assert(s);
1620
1621 /* Returns 0 if the cgroup is empty or doesn't exist, > 0 if it is exists and is populated, < 0 if we can't
1622 * figure it out */
1623
1624 if (!UNIT(s)->cgroup_path)
1625 return 0;
1626
1627 r = cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER, UNIT(s)->cgroup_path);
1628 if (r < 0)
1629 return r;
1630
1631 return r == 0;
1632 }
1633
1634 static bool service_shall_restart(Service *s) {
1635 assert(s);
1636
1637 /* Don't restart after manual stops */
1638 if (s->forbid_restart)
1639 return false;
1640
1641 /* Never restart if this is configured as special exception */
1642 if (exit_status_set_test(&s->restart_prevent_status, s->main_exec_status.code, s->main_exec_status.status))
1643 return false;
1644
1645 /* Restart if the exit code/status are configured as restart triggers */
1646 if (exit_status_set_test(&s->restart_force_status, s->main_exec_status.code, s->main_exec_status.status))
1647 return true;
1648
1649 switch (s->restart) {
1650
1651 case SERVICE_RESTART_NO:
1652 return false;
1653
1654 case SERVICE_RESTART_ALWAYS:
1655 return true;
1656
1657 case SERVICE_RESTART_ON_SUCCESS:
1658 return s->result == SERVICE_SUCCESS;
1659
1660 case SERVICE_RESTART_ON_FAILURE:
1661 return s->result != SERVICE_SUCCESS;
1662
1663 case SERVICE_RESTART_ON_ABNORMAL:
1664 return !IN_SET(s->result, SERVICE_SUCCESS, SERVICE_FAILURE_EXIT_CODE);
1665
1666 case SERVICE_RESTART_ON_WATCHDOG:
1667 return s->result == SERVICE_FAILURE_WATCHDOG;
1668
1669 case SERVICE_RESTART_ON_ABORT:
1670 return IN_SET(s->result, SERVICE_FAILURE_SIGNAL, SERVICE_FAILURE_CORE_DUMP);
1671
1672 default:
1673 assert_not_reached("unknown restart setting");
1674 }
1675 }
1676
1677 static bool service_will_restart(Unit *u) {
1678 Service *s = SERVICE(u);
1679
1680 assert(s);
1681
1682 if (s->will_auto_restart)
1683 return true;
1684 if (s->state == SERVICE_AUTO_RESTART)
1685 return true;
1686 if (!UNIT(s)->job)
1687 return false;
1688 if (UNIT(s)->job->type == JOB_START)
1689 return true;
1690
1691 return false;
1692 }
1693
1694 static void service_enter_dead(Service *s, ServiceResult f, bool allow_restart) {
1695 int r;
1696
1697 assert(s);
1698
1699 /* If there's a stop job queued before we enter the DEAD state, we shouldn't act on Restart=, in order to not
1700 * undo what has already been enqueued. */
1701 if (unit_stop_pending(UNIT(s)))
1702 allow_restart = false;
1703
1704 if (s->result == SERVICE_SUCCESS)
1705 s->result = f;
1706
1707 unit_log_result(UNIT(s), s->result == SERVICE_SUCCESS, service_result_to_string(s->result));
1708
1709 if (allow_restart && service_shall_restart(s))
1710 s->will_auto_restart = true;
1711
1712 /* Make sure service_release_resources() doesn't destroy our FD store, while we are changing through
1713 * SERVICE_FAILED/SERVICE_DEAD before entering into SERVICE_AUTO_RESTART. */
1714 s->n_keep_fd_store ++;
1715
1716 service_set_state(s, s->result != SERVICE_SUCCESS ? SERVICE_FAILED : SERVICE_DEAD);
1717
1718 if (s->will_auto_restart) {
1719 s->will_auto_restart = false;
1720
1721 r = service_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->restart_usec));
1722 if (r < 0) {
1723 s->n_keep_fd_store--;
1724 goto fail;
1725 }
1726
1727 service_set_state(s, SERVICE_AUTO_RESTART);
1728 } else
1729 /* If we shan't restart, then flush out the restart counter. But don't do that immediately, so that the
1730 * user can still introspect the counter. Do so on the next start. */
1731 s->flush_n_restarts = true;
1732
1733 /* The new state is in effect, let's decrease the fd store ref counter again. Let's also readd us to the GC
1734 * queue, so that the fd store is possibly gc'ed again */
1735 s->n_keep_fd_store--;
1736 unit_add_to_gc_queue(UNIT(s));
1737
1738 /* The next restart might not be a manual stop, hence reset the flag indicating manual stops */
1739 s->forbid_restart = false;
1740
1741 /* We want fresh tmpdirs in case service is started again immediately */
1742 s->exec_runtime = exec_runtime_unref(s->exec_runtime, true);
1743
1744 if (s->exec_context.runtime_directory_preserve_mode == EXEC_PRESERVE_NO ||
1745 (s->exec_context.runtime_directory_preserve_mode == EXEC_PRESERVE_RESTART && !service_will_restart(UNIT(s))))
1746 /* Also, remove the runtime directory */
1747 exec_context_destroy_runtime_directory(&s->exec_context, UNIT(s)->manager->prefix[EXEC_DIRECTORY_RUNTIME]);
1748
1749 /* Get rid of the IPC bits of the user */
1750 unit_unref_uid_gid(UNIT(s), true);
1751
1752 /* Release the user, and destroy it if we are the only remaining owner */
1753 dynamic_creds_destroy(&s->dynamic_creds);
1754
1755 /* Try to delete the pid file. At this point it will be
1756 * out-of-date, and some software might be confused by it, so
1757 * let's remove it. */
1758 if (s->pid_file)
1759 (void) unlink(s->pid_file);
1760
1761 return;
1762
1763 fail:
1764 log_unit_warning_errno(UNIT(s), r, "Failed to run install restart timer: %m");
1765 service_enter_dead(s, SERVICE_FAILURE_RESOURCES, false);
1766 }
1767
1768 static void service_enter_stop_post(Service *s, ServiceResult f) {
1769 int r;
1770 assert(s);
1771
1772 if (s->result == SERVICE_SUCCESS)
1773 s->result = f;
1774
1775 service_unwatch_control_pid(s);
1776 (void) unit_enqueue_rewatch_pids(UNIT(s));
1777
1778 s->control_command = s->exec_command[SERVICE_EXEC_STOP_POST];
1779 if (s->control_command) {
1780 s->control_command_id = SERVICE_EXEC_STOP_POST;
1781
1782 r = service_spawn(s,
1783 s->control_command,
1784 s->timeout_stop_usec,
1785 EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN|EXEC_IS_CONTROL|EXEC_SETENV_RESULT|EXEC_CONTROL_CGROUP,
1786 &s->control_pid);
1787 if (r < 0)
1788 goto fail;
1789
1790 service_set_state(s, SERVICE_STOP_POST);
1791 } else
1792 service_enter_signal(s, SERVICE_FINAL_SIGTERM, SERVICE_SUCCESS);
1793
1794 return;
1795
1796 fail:
1797 log_unit_warning_errno(UNIT(s), r, "Failed to run 'stop-post' task: %m");
1798 service_enter_signal(s, SERVICE_FINAL_SIGTERM, SERVICE_FAILURE_RESOURCES);
1799 }
1800
1801 static int state_to_kill_operation(ServiceState state) {
1802 switch (state) {
1803
1804 case SERVICE_STOP_WATCHDOG:
1805 return KILL_WATCHDOG;
1806
1807 case SERVICE_STOP_SIGTERM:
1808 case SERVICE_FINAL_SIGTERM:
1809 return KILL_TERMINATE;
1810
1811 case SERVICE_STOP_SIGKILL:
1812 case SERVICE_FINAL_SIGKILL:
1813 return KILL_KILL;
1814
1815 default:
1816 return _KILL_OPERATION_INVALID;
1817 }
1818 }
1819
1820 static void service_enter_signal(Service *s, ServiceState state, ServiceResult f) {
1821 int r;
1822
1823 assert(s);
1824
1825 if (s->result == SERVICE_SUCCESS)
1826 s->result = f;
1827
1828 /* Before sending any signal, make sure we track all members of this cgroup */
1829 (void) unit_watch_all_pids(UNIT(s));
1830
1831 /* Also, enqueue a job that we recheck all our PIDs a bit later, given that it's likely some processes have
1832 * died now */
1833 (void) unit_enqueue_rewatch_pids(UNIT(s));
1834
1835 r = unit_kill_context(
1836 UNIT(s),
1837 &s->kill_context,
1838 state_to_kill_operation(state),
1839 s->main_pid,
1840 s->control_pid,
1841 s->main_pid_alien);
1842 if (r < 0)
1843 goto fail;
1844
1845 if (r > 0) {
1846 r = service_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_stop_usec));
1847 if (r < 0)
1848 goto fail;
1849
1850 service_set_state(s, state);
1851 } else if (IN_SET(state, SERVICE_STOP_WATCHDOG, SERVICE_STOP_SIGTERM) && s->kill_context.send_sigkill)
1852 service_enter_signal(s, SERVICE_STOP_SIGKILL, SERVICE_SUCCESS);
1853 else if (IN_SET(state, SERVICE_STOP_WATCHDOG, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL))
1854 service_enter_stop_post(s, SERVICE_SUCCESS);
1855 else if (state == SERVICE_FINAL_SIGTERM && s->kill_context.send_sigkill)
1856 service_enter_signal(s, SERVICE_FINAL_SIGKILL, SERVICE_SUCCESS);
1857 else
1858 service_enter_dead(s, SERVICE_SUCCESS, true);
1859
1860 return;
1861
1862 fail:
1863 log_unit_warning_errno(UNIT(s), r, "Failed to kill processes: %m");
1864
1865 if (IN_SET(state, SERVICE_STOP_WATCHDOG, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL))
1866 service_enter_stop_post(s, SERVICE_FAILURE_RESOURCES);
1867 else
1868 service_enter_dead(s, SERVICE_FAILURE_RESOURCES, true);
1869 }
1870
1871 static void service_enter_stop_by_notify(Service *s) {
1872 assert(s);
1873
1874 (void) unit_enqueue_rewatch_pids(UNIT(s));
1875
1876 service_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_stop_usec));
1877
1878 /* The service told us it's stopping, so it's as if we SIGTERM'd it. */
1879 service_set_state(s, SERVICE_STOP_SIGTERM);
1880 }
1881
1882 static void service_enter_stop(Service *s, ServiceResult f) {
1883 int r;
1884
1885 assert(s);
1886
1887 if (s->result == SERVICE_SUCCESS)
1888 s->result = f;
1889
1890 service_unwatch_control_pid(s);
1891 (void) unit_enqueue_rewatch_pids(UNIT(s));
1892
1893 s->control_command = s->exec_command[SERVICE_EXEC_STOP];
1894 if (s->control_command) {
1895 s->control_command_id = SERVICE_EXEC_STOP;
1896
1897 r = service_spawn(s,
1898 s->control_command,
1899 s->timeout_stop_usec,
1900 EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_IS_CONTROL|EXEC_SETENV_RESULT|EXEC_CONTROL_CGROUP,
1901 &s->control_pid);
1902 if (r < 0)
1903 goto fail;
1904
1905 service_set_state(s, SERVICE_STOP);
1906 } else
1907 service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_SUCCESS);
1908
1909 return;
1910
1911 fail:
1912 log_unit_warning_errno(UNIT(s), r, "Failed to run 'stop' task: %m");
1913 service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_FAILURE_RESOURCES);
1914 }
1915
1916 static bool service_good(Service *s) {
1917 int main_pid_ok;
1918 assert(s);
1919
1920 if (s->type == SERVICE_DBUS && !s->bus_name_good)
1921 return false;
1922
1923 main_pid_ok = main_pid_good(s);
1924 if (main_pid_ok > 0) /* It's alive */
1925 return true;
1926 if (main_pid_ok == 0) /* It's dead */
1927 return false;
1928
1929 /* OK, we don't know anything about the main PID, maybe
1930 * because there is none. Let's check the control group
1931 * instead. */
1932
1933 return cgroup_good(s) != 0;
1934 }
1935
1936 static void service_enter_running(Service *s, ServiceResult f) {
1937 assert(s);
1938
1939 if (s->result == SERVICE_SUCCESS)
1940 s->result = f;
1941
1942 service_unwatch_control_pid(s);
1943
1944 if (s->result != SERVICE_SUCCESS)
1945 service_enter_signal(s, SERVICE_STOP_SIGTERM, f);
1946 else if (service_good(s)) {
1947
1948 /* If there are any queued up sd_notify() notifications, process them now */
1949 if (s->notify_state == NOTIFY_RELOADING)
1950 service_enter_reload_by_notify(s);
1951 else if (s->notify_state == NOTIFY_STOPPING)
1952 service_enter_stop_by_notify(s);
1953 else {
1954 service_set_state(s, SERVICE_RUNNING);
1955 service_arm_timer(s, usec_add(UNIT(s)->active_enter_timestamp.monotonic, s->runtime_max_usec));
1956 }
1957
1958 } else if (s->remain_after_exit)
1959 service_set_state(s, SERVICE_EXITED);
1960 else
1961 service_enter_stop(s, SERVICE_SUCCESS);
1962 }
1963
1964 static void service_enter_start_post(Service *s) {
1965 int r;
1966 assert(s);
1967
1968 service_unwatch_control_pid(s);
1969 service_reset_watchdog(s);
1970
1971 s->control_command = s->exec_command[SERVICE_EXEC_START_POST];
1972 if (s->control_command) {
1973 s->control_command_id = SERVICE_EXEC_START_POST;
1974
1975 r = service_spawn(s,
1976 s->control_command,
1977 s->timeout_start_usec,
1978 EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_IS_CONTROL|EXEC_CONTROL_CGROUP,
1979 &s->control_pid);
1980 if (r < 0)
1981 goto fail;
1982
1983 service_set_state(s, SERVICE_START_POST);
1984 } else
1985 service_enter_running(s, SERVICE_SUCCESS);
1986
1987 return;
1988
1989 fail:
1990 log_unit_warning_errno(UNIT(s), r, "Failed to run 'start-post' task: %m");
1991 service_enter_stop(s, SERVICE_FAILURE_RESOURCES);
1992 }
1993
1994 static void service_kill_control_process(Service *s) {
1995 int r;
1996
1997 assert(s);
1998
1999 if (s->control_pid <= 0)
2000 return;
2001
2002 r = kill_and_sigcont(s->control_pid, SIGKILL);
2003 if (r < 0) {
2004 _cleanup_free_ char *comm = NULL;
2005
2006 (void) get_process_comm(s->control_pid, &comm);
2007
2008 log_unit_debug_errno(UNIT(s), r, "Failed to kill control process " PID_FMT " (%s), ignoring: %m",
2009 s->control_pid, strna(comm));
2010 }
2011 }
2012
2013 static void service_enter_start(Service *s) {
2014 ExecCommand *c;
2015 usec_t timeout;
2016 pid_t pid;
2017 int r;
2018
2019 assert(s);
2020
2021 service_unwatch_control_pid(s);
2022 service_unwatch_main_pid(s);
2023
2024 unit_warn_leftover_processes(UNIT(s));
2025
2026 if (s->type == SERVICE_FORKING) {
2027 s->control_command_id = SERVICE_EXEC_START;
2028 c = s->control_command = s->exec_command[SERVICE_EXEC_START];
2029
2030 s->main_command = NULL;
2031 } else {
2032 s->control_command_id = _SERVICE_EXEC_COMMAND_INVALID;
2033 s->control_command = NULL;
2034
2035 c = s->main_command = s->exec_command[SERVICE_EXEC_START];
2036 }
2037
2038 if (!c) {
2039 if (s->type != SERVICE_ONESHOT) {
2040 /* There's no command line configured for the main command? Hmm, that is strange. This can only
2041 * happen if the configuration changes at runtime. In this case, let's enter a failure
2042 * state. */
2043 log_unit_error(UNIT(s), "There's no 'start' task anymore we could start.");
2044 r = -ENXIO;
2045 goto fail;
2046 }
2047
2048 /* We force a fake state transition here. Otherwise, the unit would go directly from
2049 * SERVICE_DEAD to SERVICE_DEAD without SERVICE_ACTIVATING or SERVICE_ACTIVE
2050 * inbetween. This way we can later trigger actions that depend on the state
2051 * transition, including SuccessAction=. */
2052 service_set_state(s, SERVICE_START);
2053
2054 service_enter_start_post(s);
2055 return;
2056 }
2057
2058 if (IN_SET(s->type, SERVICE_SIMPLE, SERVICE_IDLE))
2059 /* For simple + idle this is the main process. We don't apply any timeout here, but
2060 * service_enter_running() will later apply the .runtime_max_usec timeout. */
2061 timeout = USEC_INFINITY;
2062 else
2063 timeout = s->timeout_start_usec;
2064
2065 r = service_spawn(s,
2066 c,
2067 timeout,
2068 EXEC_PASS_FDS|EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN|EXEC_SET_WATCHDOG,
2069 &pid);
2070 if (r < 0)
2071 goto fail;
2072
2073 if (IN_SET(s->type, SERVICE_SIMPLE, SERVICE_IDLE)) {
2074 /* For simple services we immediately start
2075 * the START_POST binaries. */
2076
2077 service_set_main_pid(s, pid);
2078 service_enter_start_post(s);
2079
2080 } else if (s->type == SERVICE_FORKING) {
2081
2082 /* For forking services we wait until the start
2083 * process exited. */
2084
2085 s->control_pid = pid;
2086 service_set_state(s, SERVICE_START);
2087
2088 } else if (IN_SET(s->type, SERVICE_ONESHOT, SERVICE_DBUS, SERVICE_NOTIFY, SERVICE_EXEC)) {
2089
2090 /* For oneshot services we wait until the start process exited, too, but it is our main process. */
2091
2092 /* For D-Bus services we know the main pid right away, but wait for the bus name to appear on the
2093 * bus. 'notify' and 'exec' services are similar. */
2094
2095 service_set_main_pid(s, pid);
2096 service_set_state(s, SERVICE_START);
2097 } else
2098 assert_not_reached("Unknown service type");
2099
2100 return;
2101
2102 fail:
2103 log_unit_warning_errno(UNIT(s), r, "Failed to run 'start' task: %m");
2104 service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_FAILURE_RESOURCES);
2105 }
2106
2107 static void service_enter_start_pre(Service *s) {
2108 int r;
2109
2110 assert(s);
2111
2112 service_unwatch_control_pid(s);
2113
2114 s->control_command = s->exec_command[SERVICE_EXEC_START_PRE];
2115 if (s->control_command) {
2116
2117 unit_warn_leftover_processes(UNIT(s));
2118
2119 s->control_command_id = SERVICE_EXEC_START_PRE;
2120
2121 r = service_spawn(s,
2122 s->control_command,
2123 s->timeout_start_usec,
2124 EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_IS_CONTROL|EXEC_APPLY_TTY_STDIN,
2125 &s->control_pid);
2126 if (r < 0)
2127 goto fail;
2128
2129 service_set_state(s, SERVICE_START_PRE);
2130 } else
2131 service_enter_start(s);
2132
2133 return;
2134
2135 fail:
2136 log_unit_warning_errno(UNIT(s), r, "Failed to run 'start-pre' task: %m");
2137 service_enter_dead(s, SERVICE_FAILURE_RESOURCES, true);
2138 }
2139
2140 static void service_enter_restart(Service *s) {
2141 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
2142 int r;
2143
2144 assert(s);
2145
2146 if (UNIT(s)->job && UNIT(s)->job->type == JOB_STOP) {
2147 /* Don't restart things if we are going down anyway */
2148 log_unit_info(UNIT(s), "Stop job pending for unit, delaying automatic restart.");
2149
2150 r = service_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->restart_usec));
2151 if (r < 0)
2152 goto fail;
2153
2154 return;
2155 }
2156
2157 /* Any units that are bound to this service must also be
2158 * restarted. We use JOB_RESTART (instead of the more obvious
2159 * JOB_START) here so that those dependency jobs will be added
2160 * as well. */
2161 r = manager_add_job(UNIT(s)->manager, JOB_RESTART, UNIT(s), JOB_REPLACE, &error, NULL);
2162 if (r < 0)
2163 goto fail;
2164
2165 /* Count the jobs we enqueue for restarting. This counter is maintained as long as the unit isn't fully
2166 * stopped, i.e. as long as it remains up or remains in auto-start states. The use can reset the counter
2167 * explicitly however via the usual "systemctl reset-failure" logic. */
2168 s->n_restarts ++;
2169 s->flush_n_restarts = false;
2170
2171 log_struct(LOG_INFO,
2172 "MESSAGE_ID=" SD_MESSAGE_UNIT_RESTART_SCHEDULED_STR,
2173 LOG_UNIT_ID(UNIT(s)),
2174 LOG_UNIT_INVOCATION_ID(UNIT(s)),
2175 LOG_UNIT_MESSAGE(UNIT(s), "Scheduled restart job, restart counter is at %u.", s->n_restarts),
2176 "N_RESTARTS=%u", s->n_restarts);
2177
2178 /* Notify clients about changed restart counter */
2179 unit_add_to_dbus_queue(UNIT(s));
2180
2181 /* Note that we stay in the SERVICE_AUTO_RESTART state here,
2182 * it will be canceled as part of the service_stop() call that
2183 * is executed as part of JOB_RESTART. */
2184
2185 return;
2186
2187 fail:
2188 log_unit_warning(UNIT(s), "Failed to schedule restart job: %s", bus_error_message(&error, -r));
2189 service_enter_dead(s, SERVICE_FAILURE_RESOURCES, false);
2190 }
2191
2192 static void service_enter_reload_by_notify(Service *s) {
2193 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
2194 int r;
2195
2196 assert(s);
2197
2198 service_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_start_usec));
2199 service_set_state(s, SERVICE_RELOAD);
2200
2201 /* service_enter_reload_by_notify is never called during a reload, thus no loops are possible. */
2202 r = manager_propagate_reload(UNIT(s)->manager, UNIT(s), JOB_FAIL, &error);
2203 if (r < 0)
2204 log_unit_warning(UNIT(s), "Failed to schedule propagation of reload: %s", bus_error_message(&error, -r));
2205 }
2206
2207 static void service_enter_reload(Service *s) {
2208 int r;
2209
2210 assert(s);
2211
2212 service_unwatch_control_pid(s);
2213 s->reload_result = SERVICE_SUCCESS;
2214
2215 s->control_command = s->exec_command[SERVICE_EXEC_RELOAD];
2216 if (s->control_command) {
2217 s->control_command_id = SERVICE_EXEC_RELOAD;
2218
2219 r = service_spawn(s,
2220 s->control_command,
2221 s->timeout_start_usec,
2222 EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_IS_CONTROL|EXEC_CONTROL_CGROUP,
2223 &s->control_pid);
2224 if (r < 0)
2225 goto fail;
2226
2227 service_set_state(s, SERVICE_RELOAD);
2228 } else
2229 service_enter_running(s, SERVICE_SUCCESS);
2230
2231 return;
2232
2233 fail:
2234 log_unit_warning_errno(UNIT(s), r, "Failed to run 'reload' task: %m");
2235 s->reload_result = SERVICE_FAILURE_RESOURCES;
2236 service_enter_running(s, SERVICE_SUCCESS);
2237 }
2238
2239 static void service_run_next_control(Service *s) {
2240 usec_t timeout;
2241 int r;
2242
2243 assert(s);
2244 assert(s->control_command);
2245 assert(s->control_command->command_next);
2246
2247 assert(s->control_command_id != SERVICE_EXEC_START);
2248
2249 s->control_command = s->control_command->command_next;
2250 service_unwatch_control_pid(s);
2251
2252 if (IN_SET(s->state, SERVICE_START_PRE, SERVICE_START, SERVICE_START_POST, SERVICE_RUNNING, SERVICE_RELOAD))
2253 timeout = s->timeout_start_usec;
2254 else
2255 timeout = s->timeout_stop_usec;
2256
2257 r = service_spawn(s,
2258 s->control_command,
2259 timeout,
2260 EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_IS_CONTROL|
2261 (IN_SET(s->control_command_id, SERVICE_EXEC_START_PRE, SERVICE_EXEC_STOP_POST) ? EXEC_APPLY_TTY_STDIN : 0)|
2262 (IN_SET(s->control_command_id, SERVICE_EXEC_STOP, SERVICE_EXEC_STOP_POST) ? EXEC_SETENV_RESULT : 0)|
2263 (IN_SET(s->control_command_id, SERVICE_EXEC_START_POST, SERVICE_EXEC_RELOAD, SERVICE_EXEC_STOP, SERVICE_EXEC_STOP_POST) ? EXEC_CONTROL_CGROUP : 0),
2264 &s->control_pid);
2265 if (r < 0)
2266 goto fail;
2267
2268 return;
2269
2270 fail:
2271 log_unit_warning_errno(UNIT(s), r, "Failed to run next control task: %m");
2272
2273 if (IN_SET(s->state, SERVICE_START_PRE, SERVICE_START_POST, SERVICE_STOP))
2274 service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_FAILURE_RESOURCES);
2275 else if (s->state == SERVICE_STOP_POST)
2276 service_enter_dead(s, SERVICE_FAILURE_RESOURCES, true);
2277 else if (s->state == SERVICE_RELOAD) {
2278 s->reload_result = SERVICE_FAILURE_RESOURCES;
2279 service_enter_running(s, SERVICE_SUCCESS);
2280 } else
2281 service_enter_stop(s, SERVICE_FAILURE_RESOURCES);
2282 }
2283
2284 static void service_run_next_main(Service *s) {
2285 pid_t pid;
2286 int r;
2287
2288 assert(s);
2289 assert(s->main_command);
2290 assert(s->main_command->command_next);
2291 assert(s->type == SERVICE_ONESHOT);
2292
2293 s->main_command = s->main_command->command_next;
2294 service_unwatch_main_pid(s);
2295
2296 r = service_spawn(s,
2297 s->main_command,
2298 s->timeout_start_usec,
2299 EXEC_PASS_FDS|EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN|EXEC_SET_WATCHDOG,
2300 &pid);
2301 if (r < 0)
2302 goto fail;
2303
2304 service_set_main_pid(s, pid);
2305
2306 return;
2307
2308 fail:
2309 log_unit_warning_errno(UNIT(s), r, "Failed to run next main task: %m");
2310 service_enter_stop(s, SERVICE_FAILURE_RESOURCES);
2311 }
2312
2313 static int service_start(Unit *u) {
2314 Service *s = SERVICE(u);
2315 int r;
2316
2317 assert(s);
2318
2319 /* We cannot fulfill this request right now, try again later
2320 * please! */
2321 if (IN_SET(s->state,
2322 SERVICE_STOP, SERVICE_STOP_WATCHDOG, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL, SERVICE_STOP_POST,
2323 SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL))
2324 return -EAGAIN;
2325
2326 /* Already on it! */
2327 if (IN_SET(s->state, SERVICE_START_PRE, SERVICE_START, SERVICE_START_POST))
2328 return 0;
2329
2330 /* A service that will be restarted must be stopped first to
2331 * trigger BindsTo and/or OnFailure dependencies. If a user
2332 * does not want to wait for the holdoff time to elapse, the
2333 * service should be manually restarted, not started. We
2334 * simply return EAGAIN here, so that any start jobs stay
2335 * queued, and assume that the auto restart timer will
2336 * eventually trigger the restart. */
2337 if (s->state == SERVICE_AUTO_RESTART)
2338 return -EAGAIN;
2339
2340 assert(IN_SET(s->state, SERVICE_DEAD, SERVICE_FAILED));
2341
2342 /* Make sure we don't enter a busy loop of some kind. */
2343 r = unit_start_limit_test(u);
2344 if (r < 0) {
2345 service_enter_dead(s, SERVICE_FAILURE_START_LIMIT_HIT, false);
2346 return r;
2347 }
2348
2349 r = unit_acquire_invocation_id(u);
2350 if (r < 0)
2351 return r;
2352
2353 s->result = SERVICE_SUCCESS;
2354 s->reload_result = SERVICE_SUCCESS;
2355 s->main_pid_known = false;
2356 s->main_pid_alien = false;
2357 s->forbid_restart = false;
2358
2359 s->status_text = mfree(s->status_text);
2360 s->status_errno = 0;
2361
2362 s->notify_state = NOTIFY_UNKNOWN;
2363
2364 s->watchdog_original_usec = s->watchdog_usec;
2365 s->watchdog_override_enable = false;
2366 s->watchdog_override_usec = USEC_INFINITY;
2367
2368 exec_command_reset_status_list_array(s->exec_command, _SERVICE_EXEC_COMMAND_MAX);
2369 exec_status_reset(&s->main_exec_status);
2370
2371 /* This is not an automatic restart? Flush the restart counter then */
2372 if (s->flush_n_restarts) {
2373 s->n_restarts = 0;
2374 s->flush_n_restarts = false;
2375 }
2376
2377 u->reset_accounting = true;
2378
2379 service_enter_start_pre(s);
2380 return 1;
2381 }
2382
2383 static int service_stop(Unit *u) {
2384 Service *s = SERVICE(u);
2385
2386 assert(s);
2387
2388 /* Don't create restart jobs from manual stops. */
2389 s->forbid_restart = true;
2390
2391 /* Already on it */
2392 if (IN_SET(s->state,
2393 SERVICE_STOP, SERVICE_STOP_WATCHDOG, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL, SERVICE_STOP_POST,
2394 SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL))
2395 return 0;
2396
2397 /* A restart will be scheduled or is in progress. */
2398 if (s->state == SERVICE_AUTO_RESTART) {
2399 service_set_state(s, SERVICE_DEAD);
2400 return 0;
2401 }
2402
2403 /* If there's already something running we go directly into
2404 * kill mode. */
2405 if (IN_SET(s->state, SERVICE_START_PRE, SERVICE_START, SERVICE_START_POST, SERVICE_RELOAD)) {
2406 service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_SUCCESS);
2407 return 0;
2408 }
2409
2410 assert(IN_SET(s->state, SERVICE_RUNNING, SERVICE_EXITED));
2411
2412 service_enter_stop(s, SERVICE_SUCCESS);
2413 return 1;
2414 }
2415
2416 static int service_reload(Unit *u) {
2417 Service *s = SERVICE(u);
2418
2419 assert(s);
2420
2421 assert(IN_SET(s->state, SERVICE_RUNNING, SERVICE_EXITED));
2422
2423 service_enter_reload(s);
2424 return 1;
2425 }
2426
2427 _pure_ static bool service_can_reload(Unit *u) {
2428 Service *s = SERVICE(u);
2429
2430 assert(s);
2431
2432 return !!s->exec_command[SERVICE_EXEC_RELOAD];
2433 }
2434
2435 static unsigned service_exec_command_index(Unit *u, ServiceExecCommand id, ExecCommand *current) {
2436 Service *s = SERVICE(u);
2437 unsigned idx = 0;
2438 ExecCommand *first, *c;
2439
2440 assert(s);
2441
2442 first = s->exec_command[id];
2443
2444 /* Figure out where we are in the list by walking back to the beginning */
2445 for (c = current; c != first; c = c->command_prev)
2446 idx++;
2447
2448 return idx;
2449 }
2450
2451 static int service_serialize_exec_command(Unit *u, FILE *f, ExecCommand *command) {
2452 _cleanup_free_ char *args = NULL, *p = NULL;
2453 size_t allocated = 0, length = 0;
2454 Service *s = SERVICE(u);
2455 const char *type, *key;
2456 ServiceExecCommand id;
2457 unsigned idx;
2458 char **arg;
2459
2460 assert(s);
2461 assert(f);
2462
2463 if (!command)
2464 return 0;
2465
2466 if (command == s->control_command) {
2467 type = "control";
2468 id = s->control_command_id;
2469 } else {
2470 type = "main";
2471 id = SERVICE_EXEC_START;
2472 }
2473
2474 idx = service_exec_command_index(u, id, command);
2475
2476 STRV_FOREACH(arg, command->argv) {
2477 _cleanup_free_ char *e = NULL;
2478 size_t n;
2479
2480 e = cescape(*arg);
2481 if (!e)
2482 return log_oom();
2483
2484 n = strlen(e);
2485 if (!GREEDY_REALLOC(args, allocated, length + 1 + n + 1))
2486 return log_oom();
2487
2488 if (length > 0)
2489 args[length++] = ' ';
2490
2491 memcpy(args + length, e, n);
2492 length += n;
2493 }
2494
2495 if (!GREEDY_REALLOC(args, allocated, length + 1))
2496 return log_oom();
2497
2498 args[length++] = 0;
2499
2500 p = cescape(command->path);
2501 if (!p)
2502 return -ENOMEM;
2503
2504 key = strjoina(type, "-command");
2505 return serialize_item_format(f, key, "%s %u %s %s", service_exec_command_to_string(id), idx, p, args);
2506 }
2507
2508 static int service_serialize(Unit *u, FILE *f, FDSet *fds) {
2509 Service *s = SERVICE(u);
2510 ServiceFDStore *fs;
2511 int r;
2512
2513 assert(u);
2514 assert(f);
2515 assert(fds);
2516
2517 (void) serialize_item(f, "state", service_state_to_string(s->state));
2518 (void) serialize_item(f, "result", service_result_to_string(s->result));
2519 (void) serialize_item(f, "reload-result", service_result_to_string(s->reload_result));
2520
2521 if (s->control_pid > 0)
2522 (void) serialize_item_format(f, "control-pid", PID_FMT, s->control_pid);
2523
2524 if (s->main_pid_known && s->main_pid > 0)
2525 (void) serialize_item_format(f, "main-pid", PID_FMT, s->main_pid);
2526
2527 (void) serialize_bool(f, "main-pid-known", s->main_pid_known);
2528 (void) serialize_bool(f, "bus-name-good", s->bus_name_good);
2529 (void) serialize_bool(f, "bus-name-owner", s->bus_name_owner);
2530
2531 (void) serialize_item_format(f, "n-restarts", "%u", s->n_restarts);
2532 (void) serialize_bool(f, "flush-n-restarts", s->flush_n_restarts);
2533
2534 r = serialize_item_escaped(f, "status-text", s->status_text);
2535 if (r < 0)
2536 return r;
2537
2538 service_serialize_exec_command(u, f, s->control_command);
2539 service_serialize_exec_command(u, f, s->main_command);
2540
2541 r = serialize_fd(f, fds, "stdin-fd", s->stdin_fd);
2542 if (r < 0)
2543 return r;
2544 r = serialize_fd(f, fds, "stdout-fd", s->stdout_fd);
2545 if (r < 0)
2546 return r;
2547 r = serialize_fd(f, fds, "stderr-fd", s->stderr_fd);
2548 if (r < 0)
2549 return r;
2550
2551 if (s->exec_fd_event_source) {
2552 r = serialize_fd(f, fds, "exec-fd", sd_event_source_get_io_fd(s->exec_fd_event_source));
2553 if (r < 0)
2554 return r;
2555
2556 (void) serialize_bool(f, "exec-fd-hot", s->exec_fd_hot);
2557 }
2558
2559 if (UNIT_ISSET(s->accept_socket)) {
2560 r = serialize_item(f, "accept-socket", UNIT_DEREF(s->accept_socket)->id);
2561 if (r < 0)
2562 return r;
2563 }
2564
2565 r = serialize_fd(f, fds, "socket-fd", s->socket_fd);
2566 if (r < 0)
2567 return r;
2568
2569 LIST_FOREACH(fd_store, fs, s->fd_store) {
2570 _cleanup_free_ char *c = NULL;
2571 int copy;
2572
2573 copy = fdset_put_dup(fds, fs->fd);
2574 if (copy < 0)
2575 return log_error_errno(copy, "Failed to copy file descriptor for serialization: %m");
2576
2577 c = cescape(fs->fdname);
2578 if (!c)
2579 return log_oom();
2580
2581 (void) serialize_item_format(f, "fd-store-fd", "%i %s", copy, c);
2582 }
2583
2584 if (s->main_exec_status.pid > 0) {
2585 (void) serialize_item_format(f, "main-exec-status-pid", PID_FMT, s->main_exec_status.pid);
2586 (void) serialize_dual_timestamp(f, "main-exec-status-start", &s->main_exec_status.start_timestamp);
2587 (void) serialize_dual_timestamp(f, "main-exec-status-exit", &s->main_exec_status.exit_timestamp);
2588
2589 if (dual_timestamp_is_set(&s->main_exec_status.exit_timestamp)) {
2590 (void) serialize_item_format(f, "main-exec-status-code", "%i", s->main_exec_status.code);
2591 (void) serialize_item_format(f, "main-exec-status-status", "%i", s->main_exec_status.status);
2592 }
2593 }
2594
2595 (void) serialize_dual_timestamp(f, "watchdog-timestamp", &s->watchdog_timestamp);
2596 (void) serialize_bool(f, "forbid-restart", s->forbid_restart);
2597
2598 if (s->watchdog_override_enable)
2599 (void) serialize_item_format(f, "watchdog-override-usec", USEC_FMT, s->watchdog_override_usec);
2600
2601 if (s->watchdog_original_usec != USEC_INFINITY)
2602 (void) serialize_item_format(f, "watchdog-original-usec", USEC_FMT, s->watchdog_original_usec);
2603
2604 return 0;
2605 }
2606
2607 static int service_deserialize_exec_command(Unit *u, const char *key, const char *value) {
2608 Service *s = SERVICE(u);
2609 int r;
2610 unsigned idx = 0, i;
2611 bool control, found = false;
2612 ServiceExecCommand id = _SERVICE_EXEC_COMMAND_INVALID;
2613 ExecCommand *command = NULL;
2614 _cleanup_free_ char *path = NULL;
2615 _cleanup_strv_free_ char **argv = NULL;
2616
2617 enum ExecCommandState {
2618 STATE_EXEC_COMMAND_TYPE,
2619 STATE_EXEC_COMMAND_INDEX,
2620 STATE_EXEC_COMMAND_PATH,
2621 STATE_EXEC_COMMAND_ARGS,
2622 _STATE_EXEC_COMMAND_MAX,
2623 _STATE_EXEC_COMMAND_INVALID = -1,
2624 } state;
2625
2626 assert(s);
2627 assert(key);
2628 assert(value);
2629
2630 control = streq(key, "control-command");
2631
2632 state = STATE_EXEC_COMMAND_TYPE;
2633
2634 for (;;) {
2635 _cleanup_free_ char *arg = NULL;
2636
2637 r = extract_first_word(&value, &arg, NULL, EXTRACT_CUNESCAPE);
2638 if (r < 0)
2639 return r;
2640 if (r == 0)
2641 break;
2642
2643 switch (state) {
2644 case STATE_EXEC_COMMAND_TYPE:
2645 id = service_exec_command_from_string(arg);
2646 if (id < 0)
2647 return -EINVAL;
2648
2649 state = STATE_EXEC_COMMAND_INDEX;
2650 break;
2651 case STATE_EXEC_COMMAND_INDEX:
2652 r = safe_atou(arg, &idx);
2653 if (r < 0)
2654 return -EINVAL;
2655
2656 state = STATE_EXEC_COMMAND_PATH;
2657 break;
2658 case STATE_EXEC_COMMAND_PATH:
2659 path = TAKE_PTR(arg);
2660 state = STATE_EXEC_COMMAND_ARGS;
2661
2662 if (!path_is_absolute(path))
2663 return -EINVAL;
2664 break;
2665 case STATE_EXEC_COMMAND_ARGS:
2666 r = strv_extend(&argv, arg);
2667 if (r < 0)
2668 return -ENOMEM;
2669 break;
2670 default:
2671 assert_not_reached("Unknown error at deserialization of exec command");
2672 break;
2673 }
2674 }
2675
2676 if (state != STATE_EXEC_COMMAND_ARGS)
2677 return -EINVAL;
2678
2679 /* Let's check whether exec command on given offset matches data that we just deserialized */
2680 for (command = s->exec_command[id], i = 0; command; command = command->command_next, i++) {
2681 if (i != idx)
2682 continue;
2683
2684 found = strv_equal(argv, command->argv) && streq(command->path, path);
2685 break;
2686 }
2687
2688 if (!found) {
2689 /* Command at the index we serialized is different, let's look for command that exactly
2690 * matches but is on different index. If there is no such command we will not resume execution. */
2691 for (command = s->exec_command[id]; command; command = command->command_next)
2692 if (strv_equal(command->argv, argv) && streq(command->path, path))
2693 break;
2694 }
2695
2696 if (command && control)
2697 s->control_command = command;
2698 else if (command)
2699 s->main_command = command;
2700 else
2701 log_unit_warning(u, "Current command vanished from the unit file, execution of the command list won't be resumed.");
2702
2703 return 0;
2704 }
2705
2706 static int service_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
2707 Service *s = SERVICE(u);
2708 int r;
2709
2710 assert(u);
2711 assert(key);
2712 assert(value);
2713 assert(fds);
2714
2715 if (streq(key, "state")) {
2716 ServiceState state;
2717
2718 state = service_state_from_string(value);
2719 if (state < 0)
2720 log_unit_debug(u, "Failed to parse state value: %s", value);
2721 else
2722 s->deserialized_state = state;
2723 } else if (streq(key, "result")) {
2724 ServiceResult f;
2725
2726 f = service_result_from_string(value);
2727 if (f < 0)
2728 log_unit_debug(u, "Failed to parse result value: %s", value);
2729 else if (f != SERVICE_SUCCESS)
2730 s->result = f;
2731
2732 } else if (streq(key, "reload-result")) {
2733 ServiceResult f;
2734
2735 f = service_result_from_string(value);
2736 if (f < 0)
2737 log_unit_debug(u, "Failed to parse reload result value: %s", value);
2738 else if (f != SERVICE_SUCCESS)
2739 s->reload_result = f;
2740
2741 } else if (streq(key, "control-pid")) {
2742 pid_t pid;
2743
2744 if (parse_pid(value, &pid) < 0)
2745 log_unit_debug(u, "Failed to parse control-pid value: %s", value);
2746 else
2747 s->control_pid = pid;
2748 } else if (streq(key, "main-pid")) {
2749 pid_t pid;
2750
2751 if (parse_pid(value, &pid) < 0)
2752 log_unit_debug(u, "Failed to parse main-pid value: %s", value);
2753 else
2754 (void) service_set_main_pid(s, pid);
2755 } else if (streq(key, "main-pid-known")) {
2756 int b;
2757
2758 b = parse_boolean(value);
2759 if (b < 0)
2760 log_unit_debug(u, "Failed to parse main-pid-known value: %s", value);
2761 else
2762 s->main_pid_known = b;
2763 } else if (streq(key, "bus-name-good")) {
2764 int b;
2765
2766 b = parse_boolean(value);
2767 if (b < 0)
2768 log_unit_debug(u, "Failed to parse bus-name-good value: %s", value);
2769 else
2770 s->bus_name_good = b;
2771 } else if (streq(key, "bus-name-owner")) {
2772 r = free_and_strdup(&s->bus_name_owner, value);
2773 if (r < 0)
2774 log_unit_error_errno(u, r, "Unable to deserialize current bus owner %s: %m", value);
2775 } else if (streq(key, "status-text")) {
2776 char *t;
2777
2778 r = cunescape(value, 0, &t);
2779 if (r < 0)
2780 log_unit_debug_errno(u, r, "Failed to unescape status text '%s': %m", value);
2781 else
2782 free_and_replace(s->status_text, t);
2783
2784 } else if (streq(key, "accept-socket")) {
2785 Unit *socket;
2786
2787 r = manager_load_unit(u->manager, value, NULL, NULL, &socket);
2788 if (r < 0)
2789 log_unit_debug_errno(u, r, "Failed to load accept-socket unit '%s': %m", value);
2790 else {
2791 unit_ref_set(&s->accept_socket, u, socket);
2792 SOCKET(socket)->n_connections++;
2793 }
2794
2795 } else if (streq(key, "socket-fd")) {
2796 int fd;
2797
2798 if (safe_atoi(value, &fd) < 0 || fd < 0 || !fdset_contains(fds, fd))
2799 log_unit_debug(u, "Failed to parse socket-fd value: %s", value);
2800 else {
2801 asynchronous_close(s->socket_fd);
2802 s->socket_fd = fdset_remove(fds, fd);
2803 }
2804 } else if (streq(key, "fd-store-fd")) {
2805 const char *fdv;
2806 size_t pf;
2807 int fd;
2808
2809 pf = strcspn(value, WHITESPACE);
2810 fdv = strndupa(value, pf);
2811
2812 if (safe_atoi(fdv, &fd) < 0 || fd < 0 || !fdset_contains(fds, fd))
2813 log_unit_debug(u, "Failed to parse fd-store-fd value: %s", value);
2814 else {
2815 _cleanup_free_ char *t = NULL;
2816 const char *fdn;
2817
2818 fdn = value + pf;
2819 fdn += strspn(fdn, WHITESPACE);
2820 (void) cunescape(fdn, 0, &t);
2821
2822 r = service_add_fd_store(s, fd, t);
2823 if (r < 0)
2824 log_unit_error_errno(u, r, "Failed to add fd to store: %m");
2825 else
2826 fdset_remove(fds, fd);
2827 }
2828
2829 } else if (streq(key, "main-exec-status-pid")) {
2830 pid_t pid;
2831
2832 if (parse_pid(value, &pid) < 0)
2833 log_unit_debug(u, "Failed to parse main-exec-status-pid value: %s", value);
2834 else
2835 s->main_exec_status.pid = pid;
2836 } else if (streq(key, "main-exec-status-code")) {
2837 int i;
2838
2839 if (safe_atoi(value, &i) < 0)
2840 log_unit_debug(u, "Failed to parse main-exec-status-code value: %s", value);
2841 else
2842 s->main_exec_status.code = i;
2843 } else if (streq(key, "main-exec-status-status")) {
2844 int i;
2845
2846 if (safe_atoi(value, &i) < 0)
2847 log_unit_debug(u, "Failed to parse main-exec-status-status value: %s", value);
2848 else
2849 s->main_exec_status.status = i;
2850 } else if (streq(key, "main-exec-status-start"))
2851 deserialize_dual_timestamp(value, &s->main_exec_status.start_timestamp);
2852 else if (streq(key, "main-exec-status-exit"))
2853 deserialize_dual_timestamp(value, &s->main_exec_status.exit_timestamp);
2854 else if (streq(key, "watchdog-timestamp"))
2855 deserialize_dual_timestamp(value, &s->watchdog_timestamp);
2856 else if (streq(key, "forbid-restart")) {
2857 int b;
2858
2859 b = parse_boolean(value);
2860 if (b < 0)
2861 log_unit_debug(u, "Failed to parse forbid-restart value: %s", value);
2862 else
2863 s->forbid_restart = b;
2864 } else if (streq(key, "stdin-fd")) {
2865 int fd;
2866
2867 if (safe_atoi(value, &fd) < 0 || fd < 0 || !fdset_contains(fds, fd))
2868 log_unit_debug(u, "Failed to parse stdin-fd value: %s", value);
2869 else {
2870 asynchronous_close(s->stdin_fd);
2871 s->stdin_fd = fdset_remove(fds, fd);
2872 s->exec_context.stdio_as_fds = true;
2873 }
2874 } else if (streq(key, "stdout-fd")) {
2875 int fd;
2876
2877 if (safe_atoi(value, &fd) < 0 || fd < 0 || !fdset_contains(fds, fd))
2878 log_unit_debug(u, "Failed to parse stdout-fd value: %s", value);
2879 else {
2880 asynchronous_close(s->stdout_fd);
2881 s->stdout_fd = fdset_remove(fds, fd);
2882 s->exec_context.stdio_as_fds = true;
2883 }
2884 } else if (streq(key, "stderr-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 stderr-fd value: %s", value);
2889 else {
2890 asynchronous_close(s->stderr_fd);
2891 s->stderr_fd = fdset_remove(fds, fd);
2892 s->exec_context.stdio_as_fds = true;
2893 }
2894 } else if (streq(key, "exec-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 exec-fd value: %s", value);
2899 else {
2900 s->exec_fd_event_source = sd_event_source_unref(s->exec_fd_event_source);
2901
2902 fd = fdset_remove(fds, fd);
2903 if (service_allocate_exec_fd_event_source(s, fd, &s->exec_fd_event_source) < 0)
2904 safe_close(fd);
2905 }
2906 } else if (streq(key, "watchdog-override-usec")) {
2907 if (deserialize_usec(value, &s->watchdog_override_usec) < 0)
2908 log_unit_debug(u, "Failed to parse watchdog_override_usec value: %s", value);
2909 else
2910 s->watchdog_override_enable = true;
2911
2912 } else if (streq(key, "watchdog-original-usec")) {
2913 if (deserialize_usec(value, &s->watchdog_original_usec) < 0)
2914 log_unit_debug(u, "Failed to parse watchdog_original_usec value: %s", value);
2915
2916 } else if (STR_IN_SET(key, "main-command", "control-command")) {
2917 r = service_deserialize_exec_command(u, key, value);
2918 if (r < 0)
2919 log_unit_debug_errno(u, r, "Failed to parse serialized command \"%s\": %m", value);
2920
2921 } else if (streq(key, "n-restarts")) {
2922 r = safe_atou(value, &s->n_restarts);
2923 if (r < 0)
2924 log_unit_debug_errno(u, r, "Failed to parse serialized restart counter '%s': %m", value);
2925
2926 } else if (streq(key, "flush-n-restarts")) {
2927 r = parse_boolean(value);
2928 if (r < 0)
2929 log_unit_debug_errno(u, r, "Failed to parse serialized flush restart counter setting '%s': %m", value);
2930 else
2931 s->flush_n_restarts = r;
2932 } else
2933 log_unit_debug(u, "Unknown serialization key: %s", key);
2934
2935 return 0;
2936 }
2937
2938 _pure_ static UnitActiveState service_active_state(Unit *u) {
2939 const UnitActiveState *table;
2940
2941 assert(u);
2942
2943 table = SERVICE(u)->type == SERVICE_IDLE ? state_translation_table_idle : state_translation_table;
2944
2945 return table[SERVICE(u)->state];
2946 }
2947
2948 static const char *service_sub_state_to_string(Unit *u) {
2949 assert(u);
2950
2951 return service_state_to_string(SERVICE(u)->state);
2952 }
2953
2954 static bool service_may_gc(Unit *u) {
2955 Service *s = SERVICE(u);
2956
2957 assert(s);
2958
2959 /* Never clean up services that still have a process around, even if the service is formally dead. Note that
2960 * unit_may_gc() already checked our cgroup for us, we just check our two additional PIDs, too, in case they
2961 * have moved outside of the cgroup. */
2962
2963 if (main_pid_good(s) > 0 ||
2964 control_pid_good(s) > 0)
2965 return false;
2966
2967 return true;
2968 }
2969
2970 static int service_retry_pid_file(Service *s) {
2971 int r;
2972
2973 assert(s->pid_file);
2974 assert(IN_SET(s->state, SERVICE_START, SERVICE_START_POST));
2975
2976 r = service_load_pid_file(s, false);
2977 if (r < 0)
2978 return r;
2979
2980 service_unwatch_pid_file(s);
2981
2982 service_enter_running(s, SERVICE_SUCCESS);
2983 return 0;
2984 }
2985
2986 static int service_watch_pid_file(Service *s) {
2987 int r;
2988
2989 log_unit_debug(UNIT(s), "Setting watch for PID file %s", s->pid_file_pathspec->path);
2990
2991 r = path_spec_watch(s->pid_file_pathspec, service_dispatch_inotify_io);
2992 if (r < 0)
2993 goto fail;
2994
2995 /* the pidfile might have appeared just before we set the watch */
2996 log_unit_debug(UNIT(s), "Trying to read PID file %s in case it changed", s->pid_file_pathspec->path);
2997 service_retry_pid_file(s);
2998
2999 return 0;
3000 fail:
3001 log_unit_error_errno(UNIT(s), r, "Failed to set a watch for PID file %s: %m", s->pid_file_pathspec->path);
3002 service_unwatch_pid_file(s);
3003 return r;
3004 }
3005
3006 static int service_demand_pid_file(Service *s) {
3007 PathSpec *ps;
3008
3009 assert(s->pid_file);
3010 assert(!s->pid_file_pathspec);
3011
3012 ps = new0(PathSpec, 1);
3013 if (!ps)
3014 return -ENOMEM;
3015
3016 ps->unit = UNIT(s);
3017 ps->path = strdup(s->pid_file);
3018 if (!ps->path) {
3019 free(ps);
3020 return -ENOMEM;
3021 }
3022
3023 path_simplify(ps->path, false);
3024
3025 /* PATH_CHANGED would not be enough. There are daemons (sendmail) that
3026 * keep their PID file open all the time. */
3027 ps->type = PATH_MODIFIED;
3028 ps->inotify_fd = -1;
3029
3030 s->pid_file_pathspec = ps;
3031
3032 return service_watch_pid_file(s);
3033 }
3034
3035 static int service_dispatch_inotify_io(sd_event_source *source, int fd, uint32_t events, void *userdata) {
3036 PathSpec *p = userdata;
3037 Service *s;
3038
3039 assert(p);
3040
3041 s = SERVICE(p->unit);
3042
3043 assert(s);
3044 assert(fd >= 0);
3045 assert(IN_SET(s->state, SERVICE_START, SERVICE_START_POST));
3046 assert(s->pid_file_pathspec);
3047 assert(path_spec_owns_inotify_fd(s->pid_file_pathspec, fd));
3048
3049 log_unit_debug(UNIT(s), "inotify event");
3050
3051 if (path_spec_fd_event(p, events) < 0)
3052 goto fail;
3053
3054 if (service_retry_pid_file(s) == 0)
3055 return 0;
3056
3057 if (service_watch_pid_file(s) < 0)
3058 goto fail;
3059
3060 return 0;
3061
3062 fail:
3063 service_unwatch_pid_file(s);
3064 service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_FAILURE_RESOURCES);
3065 return 0;
3066 }
3067
3068 static int service_dispatch_exec_io(sd_event_source *source, int fd, uint32_t events, void *userdata) {
3069 Service *s = SERVICE(userdata);
3070
3071 assert(s);
3072
3073 log_unit_debug(UNIT(s), "got exec-fd event");
3074
3075 /* If Type=exec is set, we'll consider a service started successfully the instant we invoked execve()
3076 * successfully for it. We implement this through a pipe() towards the child, which the kernel automatically
3077 * closes for us due to O_CLOEXEC on execve() in the child, which then triggers EOF on the pipe in the
3078 * parent. We need to be careful however, as there are other reasons that we might cause the child's side of
3079 * the pipe to be closed (for example, a simple exit()). To deal with that we'll ignore EOFs on the pipe unless
3080 * the child signalled us first that it is about to call the execve(). It does so by sending us a simple
3081 * non-zero byte via the pipe. We also provide the child with a way to inform us in case execve() failed: if it
3082 * sends a zero byte we'll ignore POLLHUP on the fd again. */
3083
3084 for (;;) {
3085 uint8_t x;
3086 ssize_t n;
3087
3088 n = read(fd, &x, sizeof(x));
3089 if (n < 0) {
3090 if (errno == EAGAIN) /* O_NONBLOCK in effect → everything queued has now been processed. */
3091 return 0;
3092
3093 return log_unit_error_errno(UNIT(s), errno, "Failed to read from exec_fd: %m");
3094 }
3095 if (n == 0) { /* EOF → the event we are waiting for */
3096
3097 s->exec_fd_event_source = sd_event_source_unref(s->exec_fd_event_source);
3098
3099 if (s->exec_fd_hot) { /* Did the child tell us to expect EOF now? */
3100 log_unit_debug(UNIT(s), "Got EOF on exec-fd");
3101
3102 s->exec_fd_hot = false;
3103
3104 /* Nice! This is what we have been waiting for. Transition to next state. */
3105 if (s->type == SERVICE_EXEC && s->state == SERVICE_START)
3106 service_enter_start_post(s);
3107 } else
3108 log_unit_debug(UNIT(s), "Got EOF on exec-fd while it was disabled, ignoring.");
3109
3110 return 0;
3111 }
3112
3113 /* A byte was read → this turns on/off the exec fd logic */
3114 assert(n == sizeof(x));
3115 s->exec_fd_hot = x;
3116 }
3117
3118 return 0;
3119 }
3120
3121 static void service_notify_cgroup_empty_event(Unit *u) {
3122 Service *s = SERVICE(u);
3123
3124 assert(u);
3125
3126 log_unit_debug(u, "cgroup is empty");
3127
3128 switch (s->state) {
3129
3130 /* Waiting for SIGCHLD is usually more interesting,
3131 * because it includes return codes/signals. Which is
3132 * why we ignore the cgroup events for most cases,
3133 * except when we don't know pid which to expect the
3134 * SIGCHLD for. */
3135
3136 case SERVICE_START:
3137 if (s->type == SERVICE_NOTIFY &&
3138 main_pid_good(s) == 0 &&
3139 control_pid_good(s) == 0) {
3140 /* No chance of getting a ready notification anymore */
3141 service_enter_stop_post(s, SERVICE_FAILURE_PROTOCOL);
3142 break;
3143 }
3144
3145 _fallthrough_;
3146 case SERVICE_START_POST:
3147 if (s->pid_file_pathspec &&
3148 main_pid_good(s) == 0 &&
3149 control_pid_good(s) == 0) {
3150
3151 /* Give up hoping for the daemon to write its PID file */
3152 log_unit_warning(u, "Daemon never wrote its PID file. Failing.");
3153
3154 service_unwatch_pid_file(s);
3155 if (s->state == SERVICE_START)
3156 service_enter_stop_post(s, SERVICE_FAILURE_PROTOCOL);
3157 else
3158 service_enter_stop(s, SERVICE_FAILURE_PROTOCOL);
3159 }
3160 break;
3161
3162 case SERVICE_RUNNING:
3163 /* service_enter_running() will figure out what to do */
3164 service_enter_running(s, SERVICE_SUCCESS);
3165 break;
3166
3167 case SERVICE_STOP_WATCHDOG:
3168 case SERVICE_STOP_SIGTERM:
3169 case SERVICE_STOP_SIGKILL:
3170
3171 if (main_pid_good(s) <= 0 && control_pid_good(s) <= 0)
3172 service_enter_stop_post(s, SERVICE_SUCCESS);
3173
3174 break;
3175
3176 case SERVICE_STOP_POST:
3177 case SERVICE_FINAL_SIGTERM:
3178 case SERVICE_FINAL_SIGKILL:
3179 if (main_pid_good(s) <= 0 && control_pid_good(s) <= 0)
3180 service_enter_dead(s, SERVICE_SUCCESS, true);
3181
3182 break;
3183
3184 default:
3185 ;
3186 }
3187 }
3188
3189 static void service_sigchld_event(Unit *u, pid_t pid, int code, int status) {
3190 bool notify_dbus = true;
3191 Service *s = SERVICE(u);
3192 ServiceResult f;
3193
3194 assert(s);
3195 assert(pid >= 0);
3196
3197 if (is_clean_exit(code, status, s->type == SERVICE_ONESHOT ? EXIT_CLEAN_COMMAND : EXIT_CLEAN_DAEMON, &s->success_status))
3198 f = SERVICE_SUCCESS;
3199 else if (code == CLD_EXITED)
3200 f = SERVICE_FAILURE_EXIT_CODE;
3201 else if (code == CLD_KILLED)
3202 f = SERVICE_FAILURE_SIGNAL;
3203 else if (code == CLD_DUMPED)
3204 f = SERVICE_FAILURE_CORE_DUMP;
3205 else
3206 assert_not_reached("Unknown code");
3207
3208 if (s->main_pid == pid) {
3209 /* Forking services may occasionally move to a new PID.
3210 * As long as they update the PID file before exiting the old
3211 * PID, they're fine. */
3212 if (service_load_pid_file(s, false) > 0)
3213 return;
3214
3215 s->main_pid = 0;
3216 exec_status_exit(&s->main_exec_status, &s->exec_context, pid, code, status);
3217
3218 if (s->main_command) {
3219 /* If this is not a forking service than the
3220 * main process got started and hence we copy
3221 * the exit status so that it is recorded both
3222 * as main and as control process exit
3223 * status */
3224
3225 s->main_command->exec_status = s->main_exec_status;
3226
3227 if (s->main_command->flags & EXEC_COMMAND_IGNORE_FAILURE)
3228 f = SERVICE_SUCCESS;
3229 } else if (s->exec_command[SERVICE_EXEC_START]) {
3230
3231 /* If this is a forked process, then we should
3232 * ignore the return value if this was
3233 * configured for the starter process */
3234
3235 if (s->exec_command[SERVICE_EXEC_START]->flags & EXEC_COMMAND_IGNORE_FAILURE)
3236 f = SERVICE_SUCCESS;
3237 }
3238
3239 /* When this is a successful exit, let's log about the exit code on DEBUG level. If this is a failure
3240 * and the process exited on its own via exit(), then let's make this a NOTICE, under the assumption
3241 * that the service already logged the reason at a higher log level on its own. (Internally,
3242 * unit_log_process_exit() will possibly bump this to WARNING if the service died due to a signal.) */
3243 unit_log_process_exit(
3244 u, f == SERVICE_SUCCESS ? LOG_DEBUG : LOG_NOTICE,
3245 "Main process",
3246 service_exec_command_to_string(SERVICE_EXEC_START),
3247 code, status);
3248
3249 if (s->result == SERVICE_SUCCESS)
3250 s->result = f;
3251
3252 if (s->main_command &&
3253 s->main_command->command_next &&
3254 s->type == SERVICE_ONESHOT &&
3255 f == SERVICE_SUCCESS) {
3256
3257 /* There is another command to *
3258 * execute, so let's do that. */
3259
3260 log_unit_debug(u, "Running next main command for state %s.", service_state_to_string(s->state));
3261 service_run_next_main(s);
3262
3263 } else {
3264
3265 /* The service exited, so the service is officially
3266 * gone. */
3267 s->main_command = NULL;
3268
3269 switch (s->state) {
3270
3271 case SERVICE_START_POST:
3272 case SERVICE_RELOAD:
3273 case SERVICE_STOP:
3274 /* Need to wait until the operation is
3275 * done */
3276 break;
3277
3278 case SERVICE_START:
3279 if (s->type == SERVICE_ONESHOT) {
3280 /* This was our main goal, so let's go on */
3281 if (f == SERVICE_SUCCESS)
3282 service_enter_start_post(s);
3283 else
3284 service_enter_signal(s, SERVICE_STOP_SIGTERM, f);
3285 break;
3286 } else if (s->type == SERVICE_NOTIFY) {
3287 /* Only enter running through a notification, so that the
3288 * SERVICE_START state signifies that no ready notification
3289 * has been received */
3290 if (f != SERVICE_SUCCESS)
3291 service_enter_signal(s, SERVICE_STOP_SIGTERM, f);
3292 else if (!s->remain_after_exit || s->notify_access == NOTIFY_MAIN)
3293 /* The service has never been and will never be active */
3294 service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_FAILURE_PROTOCOL);
3295 break;
3296 }
3297
3298 _fallthrough_;
3299 case SERVICE_RUNNING:
3300 service_enter_running(s, f);
3301 break;
3302
3303 case SERVICE_STOP_WATCHDOG:
3304 case SERVICE_STOP_SIGTERM:
3305 case SERVICE_STOP_SIGKILL:
3306
3307 if (control_pid_good(s) <= 0)
3308 service_enter_stop_post(s, f);
3309
3310 /* If there is still a control process, wait for that first */
3311 break;
3312
3313 case SERVICE_STOP_POST:
3314 case SERVICE_FINAL_SIGTERM:
3315 case SERVICE_FINAL_SIGKILL:
3316
3317 if (control_pid_good(s) <= 0)
3318 service_enter_dead(s, f, true);
3319 break;
3320
3321 default:
3322 assert_not_reached("Uh, main process died at wrong time.");
3323 }
3324 }
3325
3326 } else if (s->control_pid == pid) {
3327 s->control_pid = 0;
3328
3329 if (s->control_command) {
3330 exec_status_exit(&s->control_command->exec_status, &s->exec_context, pid, code, status);
3331
3332 if (s->control_command->flags & EXEC_COMMAND_IGNORE_FAILURE)
3333 f = SERVICE_SUCCESS;
3334 }
3335
3336 unit_log_process_exit(
3337 u, f == SERVICE_SUCCESS ? LOG_DEBUG : LOG_NOTICE,
3338 "Control process",
3339 service_exec_command_to_string(s->control_command_id),
3340 code, status);
3341
3342 if (s->result == SERVICE_SUCCESS)
3343 s->result = f;
3344
3345 if (s->control_command &&
3346 s->control_command->command_next &&
3347 f == SERVICE_SUCCESS) {
3348
3349 /* There is another command to *
3350 * execute, so let's do that. */
3351
3352 log_unit_debug(u, "Running next control command for state %s.", service_state_to_string(s->state));
3353 service_run_next_control(s);
3354
3355 } else {
3356 /* No further commands for this step, so let's
3357 * figure out what to do next */
3358
3359 s->control_command = NULL;
3360 s->control_command_id = _SERVICE_EXEC_COMMAND_INVALID;
3361
3362 log_unit_debug(u, "Got final SIGCHLD for state %s.", service_state_to_string(s->state));
3363
3364 switch (s->state) {
3365
3366 case SERVICE_START_PRE:
3367 if (f == SERVICE_SUCCESS)
3368 service_enter_start(s);
3369 else
3370 service_enter_signal(s, SERVICE_STOP_SIGTERM, f);
3371 break;
3372
3373 case SERVICE_START:
3374 if (s->type != SERVICE_FORKING)
3375 /* Maybe spurious event due to a reload that changed the type? */
3376 break;
3377
3378 if (f != SERVICE_SUCCESS) {
3379 service_enter_signal(s, SERVICE_STOP_SIGTERM, f);
3380 break;
3381 }
3382
3383 if (s->pid_file) {
3384 bool has_start_post;
3385 int r;
3386
3387 /* Let's try to load the pid file here if we can.
3388 * The PID file might actually be created by a START_POST
3389 * script. In that case don't worry if the loading fails. */
3390
3391 has_start_post = s->exec_command[SERVICE_EXEC_START_POST];
3392 r = service_load_pid_file(s, !has_start_post);
3393 if (!has_start_post && r < 0) {
3394 r = service_demand_pid_file(s);
3395 if (r < 0 || cgroup_good(s) == 0)
3396 service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_FAILURE_PROTOCOL);
3397 break;
3398 }
3399 } else
3400 service_search_main_pid(s);
3401
3402 service_enter_start_post(s);
3403 break;
3404
3405 case SERVICE_START_POST:
3406 if (f != SERVICE_SUCCESS) {
3407 service_enter_signal(s, SERVICE_STOP_SIGTERM, f);
3408 break;
3409 }
3410
3411 if (s->pid_file) {
3412 int r;
3413
3414 r = service_load_pid_file(s, true);
3415 if (r < 0) {
3416 r = service_demand_pid_file(s);
3417 if (r < 0 || cgroup_good(s) == 0)
3418 service_enter_stop(s, SERVICE_FAILURE_PROTOCOL);
3419 break;
3420 }
3421 } else
3422 service_search_main_pid(s);
3423
3424 service_enter_running(s, SERVICE_SUCCESS);
3425 break;
3426
3427 case SERVICE_RELOAD:
3428 if (f == SERVICE_SUCCESS)
3429 if (service_load_pid_file(s, true) < 0)
3430 service_search_main_pid(s);
3431
3432 s->reload_result = f;
3433 service_enter_running(s, SERVICE_SUCCESS);
3434 break;
3435
3436 case SERVICE_STOP:
3437 service_enter_signal(s, SERVICE_STOP_SIGTERM, f);
3438 break;
3439
3440 case SERVICE_STOP_WATCHDOG:
3441 case SERVICE_STOP_SIGTERM:
3442 case SERVICE_STOP_SIGKILL:
3443 if (main_pid_good(s) <= 0)
3444 service_enter_stop_post(s, f);
3445
3446 /* If there is still a service
3447 * process around, wait until
3448 * that one quit, too */
3449 break;
3450
3451 case SERVICE_STOP_POST:
3452 case SERVICE_FINAL_SIGTERM:
3453 case SERVICE_FINAL_SIGKILL:
3454 if (main_pid_good(s) <= 0)
3455 service_enter_dead(s, f, true);
3456 break;
3457
3458 default:
3459 assert_not_reached("Uh, control process died at wrong time.");
3460 }
3461 }
3462 } else /* Neither control nor main PID? If so, don't notify about anything */
3463 notify_dbus = false;
3464
3465 /* Notify clients about changed exit status */
3466 if (notify_dbus)
3467 unit_add_to_dbus_queue(u);
3468
3469 /* If we get a SIGCHLD event for one of the processes we were interested in, then we look for others to watch,
3470 * under the assumption that we'll sooner or later get a SIGCHLD for them, as the original process we watched
3471 * was probably the parent of them, and they are hence now our children. */
3472 (void) unit_enqueue_rewatch_pids(u);
3473 }
3474
3475 static int service_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) {
3476 Service *s = SERVICE(userdata);
3477
3478 assert(s);
3479 assert(source == s->timer_event_source);
3480
3481 switch (s->state) {
3482
3483 case SERVICE_START_PRE:
3484 case SERVICE_START:
3485 log_unit_warning(UNIT(s), "%s operation timed out. Terminating.", s->state == SERVICE_START ? "Start" : "Start-pre");
3486 service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_FAILURE_TIMEOUT);
3487 break;
3488
3489 case SERVICE_START_POST:
3490 log_unit_warning(UNIT(s), "Start-post operation timed out. Stopping.");
3491 service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_FAILURE_TIMEOUT);
3492 break;
3493
3494 case SERVICE_RUNNING:
3495 log_unit_warning(UNIT(s), "Service reached runtime time limit. Stopping.");
3496 service_enter_stop(s, SERVICE_FAILURE_TIMEOUT);
3497 break;
3498
3499 case SERVICE_RELOAD:
3500 log_unit_warning(UNIT(s), "Reload operation timed out. Killing reload process.");
3501 service_kill_control_process(s);
3502 s->reload_result = SERVICE_FAILURE_TIMEOUT;
3503 service_enter_running(s, SERVICE_SUCCESS);
3504 break;
3505
3506 case SERVICE_STOP:
3507 log_unit_warning(UNIT(s), "Stopping timed out. Terminating.");
3508 service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_FAILURE_TIMEOUT);
3509 break;
3510
3511 case SERVICE_STOP_WATCHDOG:
3512 log_unit_warning(UNIT(s), "State 'stop-watchdog' timed out. Terminating.");
3513 service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_FAILURE_TIMEOUT);
3514 break;
3515
3516 case SERVICE_STOP_SIGTERM:
3517 if (s->kill_context.send_sigkill) {
3518 log_unit_warning(UNIT(s), "State 'stop-sigterm' timed out. Killing.");
3519 service_enter_signal(s, SERVICE_STOP_SIGKILL, SERVICE_FAILURE_TIMEOUT);
3520 } else {
3521 log_unit_warning(UNIT(s), "State 'stop-sigterm' timed out. Skipping SIGKILL.");
3522 service_enter_stop_post(s, SERVICE_FAILURE_TIMEOUT);
3523 }
3524
3525 break;
3526
3527 case SERVICE_STOP_SIGKILL:
3528 /* Uh, we sent a SIGKILL and it is still not gone?
3529 * Must be something we cannot kill, so let's just be
3530 * weirded out and continue */
3531
3532 log_unit_warning(UNIT(s), "Processes still around after SIGKILL. Ignoring.");
3533 service_enter_stop_post(s, SERVICE_FAILURE_TIMEOUT);
3534 break;
3535
3536 case SERVICE_STOP_POST:
3537 log_unit_warning(UNIT(s), "State 'stop-post' timed out. Terminating.");
3538 service_enter_signal(s, SERVICE_FINAL_SIGTERM, SERVICE_FAILURE_TIMEOUT);
3539 break;
3540
3541 case SERVICE_FINAL_SIGTERM:
3542 if (s->kill_context.send_sigkill) {
3543 log_unit_warning(UNIT(s), "State 'stop-final-sigterm' timed out. Killing.");
3544 service_enter_signal(s, SERVICE_FINAL_SIGKILL, SERVICE_FAILURE_TIMEOUT);
3545 } else {
3546 log_unit_warning(UNIT(s), "State 'stop-final-sigterm' timed out. Skipping SIGKILL. Entering failed mode.");
3547 service_enter_dead(s, SERVICE_FAILURE_TIMEOUT, false);
3548 }
3549
3550 break;
3551
3552 case SERVICE_FINAL_SIGKILL:
3553 log_unit_warning(UNIT(s), "Processes still around after final SIGKILL. Entering failed mode.");
3554 service_enter_dead(s, SERVICE_FAILURE_TIMEOUT, true);
3555 break;
3556
3557 case SERVICE_AUTO_RESTART:
3558 if (s->restart_usec > 0) {
3559 char buf_restart[FORMAT_TIMESPAN_MAX];
3560 log_unit_info(UNIT(s),
3561 "Service RestartSec=%s expired, scheduling restart.",
3562 format_timespan(buf_restart, sizeof buf_restart, s->restart_usec, USEC_PER_SEC));
3563 } else
3564 log_unit_info(UNIT(s),
3565 "Service has no hold-off time (RestartSec=0), scheduling restart.");
3566
3567 service_enter_restart(s);
3568 break;
3569
3570 default:
3571 assert_not_reached("Timeout at wrong time.");
3572 }
3573
3574 return 0;
3575 }
3576
3577 static int service_dispatch_watchdog(sd_event_source *source, usec_t usec, void *userdata) {
3578 Service *s = SERVICE(userdata);
3579 char t[FORMAT_TIMESPAN_MAX];
3580 usec_t watchdog_usec;
3581
3582 assert(s);
3583 assert(source == s->watchdog_event_source);
3584
3585 watchdog_usec = service_get_watchdog_usec(s);
3586
3587 if (UNIT(s)->manager->service_watchdogs) {
3588 log_unit_error(UNIT(s), "Watchdog timeout (limit %s)!",
3589 format_timespan(t, sizeof(t), watchdog_usec, 1));
3590
3591 service_enter_signal(s, SERVICE_STOP_WATCHDOG, SERVICE_FAILURE_WATCHDOG);
3592 } else
3593 log_unit_warning(UNIT(s), "Watchdog disabled! Ignoring watchdog timeout (limit %s)!",
3594 format_timespan(t, sizeof(t), watchdog_usec, 1));
3595
3596 return 0;
3597 }
3598
3599 static bool service_notify_message_authorized(Service *s, pid_t pid, char **tags, FDSet *fds) {
3600 assert(s);
3601
3602 if (s->notify_access == NOTIFY_NONE) {
3603 log_unit_warning(UNIT(s), "Got notification message from PID "PID_FMT", but reception is disabled.", pid);
3604 return false;
3605 }
3606
3607 if (s->notify_access == NOTIFY_MAIN && pid != s->main_pid) {
3608 if (s->main_pid != 0)
3609 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);
3610 else
3611 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);
3612
3613 return false;
3614 }
3615
3616 if (s->notify_access == NOTIFY_EXEC && pid != s->main_pid && pid != s->control_pid) {
3617 if (s->main_pid != 0 && s->control_pid != 0)
3618 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,
3619 pid, s->main_pid, s->control_pid);
3620 else if (s->main_pid != 0)
3621 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);
3622 else if (s->control_pid != 0)
3623 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);
3624 else
3625 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);
3626
3627 return false;
3628 }
3629
3630 return true;
3631 }
3632
3633 static void service_notify_message(
3634 Unit *u,
3635 const struct ucred *ucred,
3636 char **tags,
3637 FDSet *fds) {
3638
3639 Service *s = SERVICE(u);
3640 bool notify_dbus = false;
3641 const char *e;
3642 char **i;
3643 int r;
3644
3645 assert(u);
3646 assert(ucred);
3647
3648 if (!service_notify_message_authorized(SERVICE(u), ucred->pid, tags, fds))
3649 return;
3650
3651 if (DEBUG_LOGGING) {
3652 _cleanup_free_ char *cc = NULL;
3653
3654 cc = strv_join(tags, ", ");
3655 log_unit_debug(u, "Got notification message from PID "PID_FMT" (%s)", ucred->pid, isempty(cc) ? "n/a" : cc);
3656 }
3657
3658 /* Interpret MAINPID= */
3659 e = strv_find_startswith(tags, "MAINPID=");
3660 if (e && IN_SET(s->state, SERVICE_START, SERVICE_START_POST, SERVICE_RUNNING, SERVICE_RELOAD)) {
3661 pid_t new_main_pid;
3662
3663 if (parse_pid(e, &new_main_pid) < 0)
3664 log_unit_warning(u, "Failed to parse MAINPID= field in notification message, ignoring: %s", e);
3665 else if (!s->main_pid_known || new_main_pid != s->main_pid) {
3666
3667 r = service_is_suitable_main_pid(s, new_main_pid, LOG_WARNING);
3668 if (r == 0) {
3669 /* The new main PID is a bit suspicous, which is OK if the sender is privileged. */
3670
3671 if (ucred->uid == 0) {
3672 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);
3673 r = 1;
3674 } else
3675 log_unit_debug(u, "New main PID "PID_FMT" does not belong to service, refusing.", new_main_pid);
3676 }
3677 if (r > 0) {
3678 service_set_main_pid(s, new_main_pid);
3679
3680 r = unit_watch_pid(UNIT(s), new_main_pid);
3681 if (r < 0)
3682 log_unit_warning_errno(UNIT(s), r, "Failed to watch new main PID "PID_FMT" for service: %m", new_main_pid);
3683
3684 notify_dbus = true;
3685 }
3686 }
3687 }
3688
3689 /* Interpret READY=/STOPPING=/RELOADING=. Last one wins. */
3690 STRV_FOREACH_BACKWARDS(i, tags) {
3691
3692 if (streq(*i, "READY=1")) {
3693 s->notify_state = NOTIFY_READY;
3694
3695 /* Type=notify services inform us about completed
3696 * initialization with READY=1 */
3697 if (s->type == SERVICE_NOTIFY && s->state == SERVICE_START)
3698 service_enter_start_post(s);
3699
3700 /* Sending READY=1 while we are reloading informs us
3701 * that the reloading is complete */
3702 if (s->state == SERVICE_RELOAD && s->control_pid == 0)
3703 service_enter_running(s, SERVICE_SUCCESS);
3704
3705 notify_dbus = true;
3706 break;
3707
3708 } else if (streq(*i, "RELOADING=1")) {
3709 s->notify_state = NOTIFY_RELOADING;
3710
3711 if (s->state == SERVICE_RUNNING)
3712 service_enter_reload_by_notify(s);
3713
3714 notify_dbus = true;
3715 break;
3716
3717 } else if (streq(*i, "STOPPING=1")) {
3718 s->notify_state = NOTIFY_STOPPING;
3719
3720 if (s->state == SERVICE_RUNNING)
3721 service_enter_stop_by_notify(s);
3722
3723 notify_dbus = true;
3724 break;
3725 }
3726 }
3727
3728 /* Interpret STATUS= */
3729 e = strv_find_startswith(tags, "STATUS=");
3730 if (e) {
3731 _cleanup_free_ char *t = NULL;
3732
3733 if (!isempty(e)) {
3734 /* Note that this size limit check is mostly paranoia: since the datagram size we are willing
3735 * to process is already limited to NOTIFY_BUFFER_MAX, this limit here should never be hit. */
3736 if (strlen(e) > STATUS_TEXT_MAX)
3737 log_unit_warning(u, "Status message overly long (%zu > %u), ignoring.", strlen(e), STATUS_TEXT_MAX);
3738 else if (!utf8_is_valid(e))
3739 log_unit_warning(u, "Status message in notification message is not UTF-8 clean, ignoring.");
3740 else {
3741 t = strdup(e);
3742 if (!t)
3743 log_oom();
3744 }
3745 }
3746
3747 if (!streq_ptr(s->status_text, t)) {
3748 free_and_replace(s->status_text, t);
3749 notify_dbus = true;
3750 }
3751 }
3752
3753 /* Interpret ERRNO= */
3754 e = strv_find_startswith(tags, "ERRNO=");
3755 if (e) {
3756 int status_errno;
3757
3758 status_errno = parse_errno(e);
3759 if (status_errno < 0)
3760 log_unit_warning_errno(u, status_errno,
3761 "Failed to parse ERRNO= field value '%s' in notification message: %m", e);
3762 else if (s->status_errno != status_errno) {
3763 s->status_errno = status_errno;
3764 notify_dbus = true;
3765 }
3766 }
3767
3768 /* Interpret EXTEND_TIMEOUT= */
3769 e = strv_find_startswith(tags, "EXTEND_TIMEOUT_USEC=");
3770 if (e) {
3771 usec_t extend_timeout_usec;
3772 if (safe_atou64(e, &extend_timeout_usec) < 0)
3773 log_unit_warning(u, "Failed to parse EXTEND_TIMEOUT_USEC=%s", e);
3774 else
3775 service_extend_timeout(s, extend_timeout_usec);
3776 }
3777
3778 /* Interpret WATCHDOG= */
3779 if (strv_find(tags, "WATCHDOG=1"))
3780 service_reset_watchdog(s);
3781
3782 e = strv_find_startswith(tags, "WATCHDOG_USEC=");
3783 if (e) {
3784 usec_t watchdog_override_usec;
3785 if (safe_atou64(e, &watchdog_override_usec) < 0)
3786 log_unit_warning(u, "Failed to parse WATCHDOG_USEC=%s", e);
3787 else
3788 service_override_watchdog_timeout(s, watchdog_override_usec);
3789 }
3790
3791 /* Process FD store messages. Either FDSTOREREMOVE=1 for removal, or FDSTORE=1 for addition. In both cases,
3792 * process FDNAME= for picking the file descriptor name to use. Note that FDNAME= is required when removing
3793 * fds, but optional when pushing in new fds, for compatibility reasons. */
3794 if (strv_find(tags, "FDSTOREREMOVE=1")) {
3795 const char *name;
3796
3797 name = strv_find_startswith(tags, "FDNAME=");
3798 if (!name || !fdname_is_valid(name))
3799 log_unit_warning(u, "FDSTOREREMOVE=1 requested, but no valid file descriptor name passed, ignoring.");
3800 else
3801 service_remove_fd_store(s, name);
3802
3803 } else if (strv_find(tags, "FDSTORE=1")) {
3804 const char *name;
3805
3806 name = strv_find_startswith(tags, "FDNAME=");
3807 if (name && !fdname_is_valid(name)) {
3808 log_unit_warning(u, "Passed FDNAME= name is invalid, ignoring.");
3809 name = NULL;
3810 }
3811
3812 (void) service_add_fd_store_set(s, fds, name);
3813 }
3814
3815 /* Notify clients about changed status or main pid */
3816 if (notify_dbus)
3817 unit_add_to_dbus_queue(u);
3818 }
3819
3820 static int service_get_timeout(Unit *u, usec_t *timeout) {
3821 Service *s = SERVICE(u);
3822 uint64_t t;
3823 int r;
3824
3825 if (!s->timer_event_source)
3826 return 0;
3827
3828 r = sd_event_source_get_time(s->timer_event_source, &t);
3829 if (r < 0)
3830 return r;
3831 if (t == USEC_INFINITY)
3832 return 0;
3833
3834 *timeout = t;
3835 return 1;
3836 }
3837
3838 static void service_bus_name_owner_change(
3839 Unit *u,
3840 const char *name,
3841 const char *old_owner,
3842 const char *new_owner) {
3843
3844 Service *s = SERVICE(u);
3845 int r;
3846
3847 assert(s);
3848 assert(name);
3849
3850 assert(streq(s->bus_name, name));
3851 assert(old_owner || new_owner);
3852
3853 if (old_owner && new_owner)
3854 log_unit_debug(u, "D-Bus name %s changed owner from %s to %s", name, old_owner, new_owner);
3855 else if (old_owner)
3856 log_unit_debug(u, "D-Bus name %s no longer registered by %s", name, old_owner);
3857 else
3858 log_unit_debug(u, "D-Bus name %s now registered by %s", name, new_owner);
3859
3860 s->bus_name_good = !!new_owner;
3861
3862 /* Track the current owner, so we can reconstruct changes after a daemon reload */
3863 r = free_and_strdup(&s->bus_name_owner, new_owner);
3864 if (r < 0) {
3865 log_unit_error_errno(u, r, "Unable to set new bus name owner %s: %m", new_owner);
3866 return;
3867 }
3868
3869 if (s->type == SERVICE_DBUS) {
3870
3871 /* service_enter_running() will figure out what to
3872 * do */
3873 if (s->state == SERVICE_RUNNING)
3874 service_enter_running(s, SERVICE_SUCCESS);
3875 else if (s->state == SERVICE_START && new_owner)
3876 service_enter_start_post(s);
3877
3878 } else if (new_owner &&
3879 s->main_pid <= 0 &&
3880 IN_SET(s->state,
3881 SERVICE_START,
3882 SERVICE_START_POST,
3883 SERVICE_RUNNING,
3884 SERVICE_RELOAD)) {
3885
3886 _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
3887 pid_t pid;
3888
3889 /* Try to acquire PID from bus service */
3890
3891 r = sd_bus_get_name_creds(u->manager->api_bus, name, SD_BUS_CREDS_PID, &creds);
3892 if (r >= 0)
3893 r = sd_bus_creds_get_pid(creds, &pid);
3894 if (r >= 0) {
3895 log_unit_debug(u, "D-Bus name %s is now owned by process " PID_FMT, name, pid);
3896
3897 service_set_main_pid(s, pid);
3898 unit_watch_pid(UNIT(s), pid);
3899 }
3900 }
3901 }
3902
3903 int service_set_socket_fd(Service *s, int fd, Socket *sock, bool selinux_context_net) {
3904 _cleanup_free_ char *peer = NULL;
3905 int r;
3906
3907 assert(s);
3908 assert(fd >= 0);
3909
3910 /* This is called by the socket code when instantiating a new service for a stream socket and the socket needs
3911 * to be configured. We take ownership of the passed fd on success. */
3912
3913 if (UNIT(s)->load_state != UNIT_LOADED)
3914 return -EINVAL;
3915
3916 if (s->socket_fd >= 0)
3917 return -EBUSY;
3918
3919 if (s->state != SERVICE_DEAD)
3920 return -EAGAIN;
3921
3922 if (getpeername_pretty(fd, true, &peer) >= 0) {
3923
3924 if (UNIT(s)->description) {
3925 _cleanup_free_ char *a;
3926
3927 a = strjoin(UNIT(s)->description, " (", peer, ")");
3928 if (!a)
3929 return -ENOMEM;
3930
3931 r = unit_set_description(UNIT(s), a);
3932 } else
3933 r = unit_set_description(UNIT(s), peer);
3934
3935 if (r < 0)
3936 return r;
3937 }
3938
3939 r = unit_add_two_dependencies(UNIT(sock), UNIT_BEFORE, UNIT_TRIGGERS, UNIT(s), false, UNIT_DEPENDENCY_IMPLICIT);
3940 if (r < 0)
3941 return r;
3942
3943 s->socket_fd = fd;
3944 s->socket_fd_selinux_context_net = selinux_context_net;
3945
3946 unit_ref_set(&s->accept_socket, UNIT(s), UNIT(sock));
3947 return 0;
3948 }
3949
3950 static void service_reset_failed(Unit *u) {
3951 Service *s = SERVICE(u);
3952
3953 assert(s);
3954
3955 if (s->state == SERVICE_FAILED)
3956 service_set_state(s, SERVICE_DEAD);
3957
3958 s->result = SERVICE_SUCCESS;
3959 s->reload_result = SERVICE_SUCCESS;
3960 s->n_restarts = 0;
3961 s->flush_n_restarts = false;
3962 }
3963
3964 static int service_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) {
3965 Service *s = SERVICE(u);
3966
3967 assert(s);
3968
3969 return unit_kill_common(u, who, signo, s->main_pid, s->control_pid, error);
3970 }
3971
3972 static int service_main_pid(Unit *u) {
3973 Service *s = SERVICE(u);
3974
3975 assert(s);
3976
3977 return s->main_pid;
3978 }
3979
3980 static int service_control_pid(Unit *u) {
3981 Service *s = SERVICE(u);
3982
3983 assert(s);
3984
3985 return s->control_pid;
3986 }
3987
3988 static bool service_needs_console(Unit *u) {
3989 Service *s = SERVICE(u);
3990
3991 assert(s);
3992
3993 /* We provide our own implementation of this here, instead of relying of the generic implementation
3994 * unit_needs_console() provides, since we want to return false if we are in SERVICE_EXITED state. */
3995
3996 if (!exec_context_may_touch_console(&s->exec_context))
3997 return false;
3998
3999 return IN_SET(s->state,
4000 SERVICE_START_PRE,
4001 SERVICE_START,
4002 SERVICE_START_POST,
4003 SERVICE_RUNNING,
4004 SERVICE_RELOAD,
4005 SERVICE_STOP,
4006 SERVICE_STOP_WATCHDOG,
4007 SERVICE_STOP_SIGTERM,
4008 SERVICE_STOP_SIGKILL,
4009 SERVICE_STOP_POST,
4010 SERVICE_FINAL_SIGTERM,
4011 SERVICE_FINAL_SIGKILL);
4012 }
4013
4014 static int service_exit_status(Unit *u) {
4015 Service *s = SERVICE(u);
4016
4017 assert(u);
4018
4019 if (s->main_exec_status.pid <= 0 ||
4020 !dual_timestamp_is_set(&s->main_exec_status.exit_timestamp))
4021 return -ENODATA;
4022
4023 if (s->main_exec_status.code != CLD_EXITED)
4024 return -EBADE;
4025
4026 return s->main_exec_status.status;
4027 }
4028
4029 static const char* const service_restart_table[_SERVICE_RESTART_MAX] = {
4030 [SERVICE_RESTART_NO] = "no",
4031 [SERVICE_RESTART_ON_SUCCESS] = "on-success",
4032 [SERVICE_RESTART_ON_FAILURE] = "on-failure",
4033 [SERVICE_RESTART_ON_ABNORMAL] = "on-abnormal",
4034 [SERVICE_RESTART_ON_WATCHDOG] = "on-watchdog",
4035 [SERVICE_RESTART_ON_ABORT] = "on-abort",
4036 [SERVICE_RESTART_ALWAYS] = "always",
4037 };
4038
4039 DEFINE_STRING_TABLE_LOOKUP(service_restart, ServiceRestart);
4040
4041 static const char* const service_type_table[_SERVICE_TYPE_MAX] = {
4042 [SERVICE_SIMPLE] = "simple",
4043 [SERVICE_FORKING] = "forking",
4044 [SERVICE_ONESHOT] = "oneshot",
4045 [SERVICE_DBUS] = "dbus",
4046 [SERVICE_NOTIFY] = "notify",
4047 [SERVICE_IDLE] = "idle",
4048 [SERVICE_EXEC] = "exec",
4049 };
4050
4051 DEFINE_STRING_TABLE_LOOKUP(service_type, ServiceType);
4052
4053 static const char* const service_exec_command_table[_SERVICE_EXEC_COMMAND_MAX] = {
4054 [SERVICE_EXEC_START_PRE] = "ExecStartPre",
4055 [SERVICE_EXEC_START] = "ExecStart",
4056 [SERVICE_EXEC_START_POST] = "ExecStartPost",
4057 [SERVICE_EXEC_RELOAD] = "ExecReload",
4058 [SERVICE_EXEC_STOP] = "ExecStop",
4059 [SERVICE_EXEC_STOP_POST] = "ExecStopPost",
4060 };
4061
4062 DEFINE_STRING_TABLE_LOOKUP(service_exec_command, ServiceExecCommand);
4063
4064 static const char* const notify_state_table[_NOTIFY_STATE_MAX] = {
4065 [NOTIFY_UNKNOWN] = "unknown",
4066 [NOTIFY_READY] = "ready",
4067 [NOTIFY_RELOADING] = "reloading",
4068 [NOTIFY_STOPPING] = "stopping",
4069 };
4070
4071 DEFINE_STRING_TABLE_LOOKUP(notify_state, NotifyState);
4072
4073 static const char* const service_result_table[_SERVICE_RESULT_MAX] = {
4074 [SERVICE_SUCCESS] = "success",
4075 [SERVICE_FAILURE_RESOURCES] = "resources",
4076 [SERVICE_FAILURE_PROTOCOL] = "protocol",
4077 [SERVICE_FAILURE_TIMEOUT] = "timeout",
4078 [SERVICE_FAILURE_EXIT_CODE] = "exit-code",
4079 [SERVICE_FAILURE_SIGNAL] = "signal",
4080 [SERVICE_FAILURE_CORE_DUMP] = "core-dump",
4081 [SERVICE_FAILURE_WATCHDOG] = "watchdog",
4082 [SERVICE_FAILURE_START_LIMIT_HIT] = "start-limit-hit",
4083 };
4084
4085 DEFINE_STRING_TABLE_LOOKUP(service_result, ServiceResult);
4086
4087 const UnitVTable service_vtable = {
4088 .object_size = sizeof(Service),
4089 .exec_context_offset = offsetof(Service, exec_context),
4090 .cgroup_context_offset = offsetof(Service, cgroup_context),
4091 .kill_context_offset = offsetof(Service, kill_context),
4092 .exec_runtime_offset = offsetof(Service, exec_runtime),
4093 .dynamic_creds_offset = offsetof(Service, dynamic_creds),
4094
4095 .sections =
4096 "Unit\0"
4097 "Service\0"
4098 "Install\0",
4099 .private_section = "Service",
4100
4101 .can_transient = true,
4102 .can_delegate = true,
4103
4104 .init = service_init,
4105 .done = service_done,
4106 .load = service_load,
4107 .release_resources = service_release_resources,
4108
4109 .coldplug = service_coldplug,
4110
4111 .dump = service_dump,
4112
4113 .start = service_start,
4114 .stop = service_stop,
4115 .reload = service_reload,
4116
4117 .can_reload = service_can_reload,
4118
4119 .kill = service_kill,
4120
4121 .serialize = service_serialize,
4122 .deserialize_item = service_deserialize_item,
4123
4124 .active_state = service_active_state,
4125 .sub_state_to_string = service_sub_state_to_string,
4126
4127 .will_restart = service_will_restart,
4128
4129 .may_gc = service_may_gc,
4130
4131 .sigchld_event = service_sigchld_event,
4132
4133 .reset_failed = service_reset_failed,
4134
4135 .notify_cgroup_empty = service_notify_cgroup_empty_event,
4136 .notify_message = service_notify_message,
4137
4138 .main_pid = service_main_pid,
4139 .control_pid = service_control_pid,
4140
4141 .bus_name_owner_change = service_bus_name_owner_change,
4142
4143 .bus_vtable = bus_service_vtable,
4144 .bus_set_property = bus_service_set_property,
4145 .bus_commit_properties = bus_service_commit_properties,
4146
4147 .get_timeout = service_get_timeout,
4148 .needs_console = service_needs_console,
4149 .exit_status = service_exit_status,
4150
4151 .status_message_formats = {
4152 .starting_stopping = {
4153 [0] = "Starting %s...",
4154 [1] = "Stopping %s...",
4155 },
4156 .finished_start_job = {
4157 [JOB_DONE] = "Started %s.",
4158 [JOB_FAILED] = "Failed to start %s.",
4159 },
4160 .finished_stop_job = {
4161 [JOB_DONE] = "Stopped %s.",
4162 [JOB_FAILED] = "Stopped (with error) %s.",
4163 },
4164 },
4165 };
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