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