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60f067b4 JS |
1 | /*** |
2 | This file is part of systemd. | |
3 | ||
4 | Copyright 2013 Lennart Poettering | |
5 | ||
6 | systemd is free software; you can redistribute it and/or modify it | |
7 | under the terms of the GNU Lesser General Public License as published by | |
8 | the Free Software Foundation; either version 2.1 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | systemd is distributed in the hope that it will be useful, but | |
12 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public License | |
17 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
18 | ***/ | |
19 | ||
f47781d8 MP |
20 | #include <sys/mman.h> |
21 | ||
db2df898 | 22 | #include "alloc-util.h" |
60f067b4 | 23 | #include "bus-internal.h" |
db2df898 MP |
24 | #include "bus-kernel.h" |
25 | #include "bus-policy.h" | |
60f067b4 | 26 | #include "bus-util.h" |
db2df898 MP |
27 | #include "busname.h" |
28 | #include "dbus-busname.h" | |
29 | #include "fd-util.h" | |
30 | #include "formats-util.h" | |
e735f4d4 | 31 | #include "kdbus.h" |
db2df898 MP |
32 | #include "parse-util.h" |
33 | #include "process-util.h" | |
86f210e9 | 34 | #include "service.h" |
db2df898 MP |
35 | #include "signal-util.h" |
36 | #include "special.h" | |
37 | #include "string-table.h" | |
38 | #include "string-util.h" | |
60f067b4 JS |
39 | |
40 | static const UnitActiveState state_translation_table[_BUSNAME_STATE_MAX] = { | |
41 | [BUSNAME_DEAD] = UNIT_INACTIVE, | |
42 | [BUSNAME_MAKING] = UNIT_ACTIVATING, | |
43 | [BUSNAME_REGISTERED] = UNIT_ACTIVE, | |
44 | [BUSNAME_LISTENING] = UNIT_ACTIVE, | |
45 | [BUSNAME_RUNNING] = UNIT_ACTIVE, | |
46 | [BUSNAME_SIGTERM] = UNIT_DEACTIVATING, | |
47 | [BUSNAME_SIGKILL] = UNIT_DEACTIVATING, | |
48 | [BUSNAME_FAILED] = UNIT_FAILED | |
49 | }; | |
50 | ||
51 | static int busname_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata); | |
52 | static int busname_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata); | |
53 | ||
54 | static void busname_init(Unit *u) { | |
55 | BusName *n = BUSNAME(u); | |
56 | ||
57 | assert(u); | |
58 | assert(u->load_state == UNIT_STUB); | |
59 | ||
60 | n->starter_fd = -1; | |
61 | n->accept_fd = true; | |
62 | n->activating = true; | |
63 | ||
64 | n->timeout_usec = u->manager->default_timeout_start_usec; | |
65 | } | |
66 | ||
67 | static void busname_unwatch_control_pid(BusName *n) { | |
68 | assert(n); | |
69 | ||
70 | if (n->control_pid <= 0) | |
71 | return; | |
72 | ||
73 | unit_unwatch_pid(UNIT(n), n->control_pid); | |
74 | n->control_pid = 0; | |
75 | } | |
76 | ||
77 | static void busname_free_policy(BusName *n) { | |
78 | BusNamePolicy *p; | |
79 | ||
80 | assert(n); | |
81 | ||
82 | while ((p = n->policy)) { | |
83 | LIST_REMOVE(policy, n->policy, p); | |
84 | ||
85 | free(p->name); | |
86 | free(p); | |
87 | } | |
88 | } | |
89 | ||
90 | static void busname_close_fd(BusName *n) { | |
91 | assert(n); | |
92 | ||
93 | n->starter_event_source = sd_event_source_unref(n->starter_event_source); | |
94 | n->starter_fd = safe_close(n->starter_fd); | |
95 | } | |
96 | ||
97 | static void busname_done(Unit *u) { | |
98 | BusName *n = BUSNAME(u); | |
99 | ||
100 | assert(n); | |
101 | ||
6300502b | 102 | n->name = mfree(n->name); |
60f067b4 JS |
103 | |
104 | busname_free_policy(n); | |
105 | busname_unwatch_control_pid(n); | |
106 | busname_close_fd(n); | |
107 | ||
108 | unit_ref_unset(&n->service); | |
109 | ||
110 | n->timer_event_source = sd_event_source_unref(n->timer_event_source); | |
111 | } | |
112 | ||
4c89c718 | 113 | static int busname_arm_timer(BusName *n, usec_t usec) { |
60f067b4 JS |
114 | int r; |
115 | ||
116 | assert(n); | |
117 | ||
60f067b4 | 118 | if (n->timer_event_source) { |
4c89c718 | 119 | r = sd_event_source_set_time(n->timer_event_source, usec); |
60f067b4 JS |
120 | if (r < 0) |
121 | return r; | |
122 | ||
123 | return sd_event_source_set_enabled(n->timer_event_source, SD_EVENT_ONESHOT); | |
124 | } | |
125 | ||
4c89c718 MP |
126 | if (usec == USEC_INFINITY) |
127 | return 0; | |
128 | ||
86f210e9 | 129 | r = sd_event_add_time( |
60f067b4 JS |
130 | UNIT(n)->manager->event, |
131 | &n->timer_event_source, | |
132 | CLOCK_MONOTONIC, | |
4c89c718 | 133 | usec, 0, |
60f067b4 | 134 | busname_dispatch_timer, n); |
e3bff60a MP |
135 | if (r < 0) |
136 | return r; | |
137 | ||
138 | (void) sd_event_source_set_description(n->timer_event_source, "busname-timer"); | |
139 | ||
140 | return 0; | |
60f067b4 JS |
141 | } |
142 | ||
143 | static int busname_add_default_default_dependencies(BusName *n) { | |
144 | int r; | |
145 | ||
146 | assert(n); | |
147 | ||
148 | r = unit_add_dependency_by_name(UNIT(n), UNIT_BEFORE, SPECIAL_BUSNAMES_TARGET, NULL, true); | |
149 | if (r < 0) | |
150 | return r; | |
151 | ||
e3bff60a | 152 | if (UNIT(n)->manager->running_as == MANAGER_SYSTEM) { |
60f067b4 JS |
153 | r = unit_add_two_dependencies_by_name(UNIT(n), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SYSINIT_TARGET, NULL, true); |
154 | if (r < 0) | |
155 | return r; | |
156 | } | |
157 | ||
158 | return unit_add_two_dependencies_by_name(UNIT(n), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, NULL, true); | |
159 | } | |
160 | ||
161 | static int busname_add_extras(BusName *n) { | |
162 | Unit *u = UNIT(n); | |
163 | int r; | |
164 | ||
165 | assert(n); | |
166 | ||
167 | if (!n->name) { | |
e3bff60a MP |
168 | r = unit_name_to_prefix(u->id, &n->name); |
169 | if (r < 0) | |
170 | return r; | |
60f067b4 JS |
171 | } |
172 | ||
173 | if (!u->description) { | |
174 | r = unit_set_description(u, n->name); | |
175 | if (r < 0) | |
176 | return r; | |
177 | } | |
178 | ||
179 | if (n->activating) { | |
180 | if (!UNIT_DEREF(n->service)) { | |
181 | Unit *x; | |
182 | ||
183 | r = unit_load_related_unit(u, ".service", &x); | |
184 | if (r < 0) | |
185 | return r; | |
186 | ||
187 | unit_ref_set(&n->service, x); | |
188 | } | |
189 | ||
190 | r = unit_add_two_dependencies(u, UNIT_BEFORE, UNIT_TRIGGERS, UNIT_DEREF(n->service), true); | |
191 | if (r < 0) | |
192 | return r; | |
193 | } | |
194 | ||
195 | if (u->default_dependencies) { | |
196 | r = busname_add_default_default_dependencies(n); | |
197 | if (r < 0) | |
198 | return r; | |
199 | } | |
200 | ||
201 | return 0; | |
202 | } | |
203 | ||
204 | static int busname_verify(BusName *n) { | |
205 | char *e; | |
206 | ||
207 | assert(n); | |
208 | ||
209 | if (UNIT(n)->load_state != UNIT_LOADED) | |
210 | return 0; | |
211 | ||
212 | if (!service_name_is_valid(n->name)) { | |
e3bff60a | 213 | log_unit_error(UNIT(n), "Name= setting is not a valid service name Refusing."); |
60f067b4 JS |
214 | return -EINVAL; |
215 | } | |
216 | ||
e735f4d4 | 217 | e = strjoina(n->name, ".busname"); |
60f067b4 | 218 | if (!unit_has_name(UNIT(n), e)) { |
e3bff60a | 219 | log_unit_error(UNIT(n), "Name= setting doesn't match unit name. Refusing."); |
60f067b4 JS |
220 | return -EINVAL; |
221 | } | |
222 | ||
223 | return 0; | |
224 | } | |
225 | ||
226 | static int busname_load(Unit *u) { | |
227 | BusName *n = BUSNAME(u); | |
228 | int r; | |
229 | ||
230 | assert(u); | |
231 | assert(u->load_state == UNIT_STUB); | |
232 | ||
233 | r = unit_load_fragment_and_dropin(u); | |
234 | if (r < 0) | |
235 | return r; | |
236 | ||
237 | if (u->load_state == UNIT_LOADED) { | |
238 | /* This is a new unit? Then let's add in some extras */ | |
239 | r = busname_add_extras(n); | |
240 | if (r < 0) | |
241 | return r; | |
242 | } | |
243 | ||
244 | return busname_verify(n); | |
245 | } | |
246 | ||
247 | static void busname_dump(Unit *u, FILE *f, const char *prefix) { | |
248 | BusName *n = BUSNAME(u); | |
249 | ||
250 | assert(n); | |
251 | assert(f); | |
252 | ||
253 | fprintf(f, | |
254 | "%sBus Name State: %s\n" | |
255 | "%sResult: %s\n" | |
256 | "%sName: %s\n" | |
257 | "%sActivating: %s\n" | |
258 | "%sAccept FD: %s\n", | |
259 | prefix, busname_state_to_string(n->state), | |
260 | prefix, busname_result_to_string(n->result), | |
261 | prefix, n->name, | |
262 | prefix, yes_no(n->activating), | |
263 | prefix, yes_no(n->accept_fd)); | |
264 | ||
265 | if (n->control_pid > 0) | |
266 | fprintf(f, | |
267 | "%sControl PID: "PID_FMT"\n", | |
268 | prefix, n->control_pid); | |
269 | } | |
270 | ||
271 | static void busname_unwatch_fd(BusName *n) { | |
272 | int r; | |
273 | ||
274 | assert(n); | |
275 | ||
276 | if (!n->starter_event_source) | |
277 | return; | |
278 | ||
279 | r = sd_event_source_set_enabled(n->starter_event_source, SD_EVENT_OFF); | |
280 | if (r < 0) | |
e3bff60a | 281 | log_unit_debug_errno(UNIT(n), r, "Failed to disable event source: %m"); |
60f067b4 JS |
282 | } |
283 | ||
284 | static int busname_watch_fd(BusName *n) { | |
285 | int r; | |
286 | ||
287 | assert(n); | |
288 | ||
289 | if (n->starter_fd < 0) | |
290 | return 0; | |
291 | ||
e3bff60a | 292 | if (n->starter_event_source) { |
60f067b4 | 293 | r = sd_event_source_set_enabled(n->starter_event_source, SD_EVENT_ON); |
e3bff60a MP |
294 | if (r < 0) |
295 | goto fail; | |
296 | } else { | |
60f067b4 | 297 | r = sd_event_add_io(UNIT(n)->manager->event, &n->starter_event_source, n->starter_fd, EPOLLIN, busname_dispatch_io, n); |
e3bff60a MP |
298 | if (r < 0) |
299 | goto fail; | |
300 | ||
301 | (void) sd_event_source_set_description(n->starter_event_source, "busname-starter"); | |
60f067b4 JS |
302 | } |
303 | ||
304 | return 0; | |
e3bff60a MP |
305 | |
306 | fail: | |
307 | log_unit_warning_errno(UNIT(n), r, "Failed to watch starter fd: %m"); | |
308 | busname_unwatch_fd(n); | |
309 | return r; | |
60f067b4 JS |
310 | } |
311 | ||
312 | static int busname_open_fd(BusName *n) { | |
5eef597e MP |
313 | _cleanup_free_ char *path = NULL; |
314 | const char *mode; | |
315 | ||
60f067b4 JS |
316 | assert(n); |
317 | ||
318 | if (n->starter_fd >= 0) | |
319 | return 0; | |
320 | ||
e3bff60a | 321 | mode = UNIT(n)->manager->running_as == MANAGER_SYSTEM ? "system" : "user"; |
5eef597e | 322 | n->starter_fd = bus_kernel_open_bus_fd(mode, &path); |
f47781d8 | 323 | if (n->starter_fd < 0) |
e3bff60a | 324 | return log_unit_warning_errno(UNIT(n), n->starter_fd, "Failed to open %s: %m", path ?: "kdbus"); |
60f067b4 JS |
325 | |
326 | return 0; | |
327 | } | |
328 | ||
329 | static void busname_set_state(BusName *n, BusNameState state) { | |
330 | BusNameState old_state; | |
331 | assert(n); | |
332 | ||
333 | old_state = n->state; | |
334 | n->state = state; | |
335 | ||
336 | if (!IN_SET(state, BUSNAME_MAKING, BUSNAME_SIGTERM, BUSNAME_SIGKILL)) { | |
337 | n->timer_event_source = sd_event_source_unref(n->timer_event_source); | |
338 | busname_unwatch_control_pid(n); | |
339 | } | |
340 | ||
341 | if (state != BUSNAME_LISTENING) | |
342 | busname_unwatch_fd(n); | |
343 | ||
344 | if (!IN_SET(state, BUSNAME_LISTENING, BUSNAME_MAKING, BUSNAME_REGISTERED, BUSNAME_RUNNING)) | |
345 | busname_close_fd(n); | |
346 | ||
347 | if (state != old_state) | |
e3bff60a | 348 | log_unit_debug(UNIT(n), "Changed %s -> %s", busname_state_to_string(old_state), busname_state_to_string(state)); |
60f067b4 JS |
349 | |
350 | unit_notify(UNIT(n), state_translation_table[old_state], state_translation_table[state], true); | |
351 | } | |
352 | ||
353 | static int busname_coldplug(Unit *u) { | |
354 | BusName *n = BUSNAME(u); | |
355 | int r; | |
356 | ||
357 | assert(n); | |
358 | assert(n->state == BUSNAME_DEAD); | |
359 | ||
360 | if (n->deserialized_state == n->state) | |
361 | return 0; | |
362 | ||
db2df898 MP |
363 | if (n->control_pid > 0 && |
364 | pid_is_unwaited(n->control_pid) && | |
365 | IN_SET(n->deserialized_state, BUSNAME_MAKING, BUSNAME_SIGTERM, BUSNAME_SIGKILL)) { | |
60f067b4 JS |
366 | |
367 | r = unit_watch_pid(UNIT(n), n->control_pid); | |
368 | if (r < 0) | |
369 | return r; | |
370 | ||
4c89c718 | 371 | r = busname_arm_timer(n, usec_add(u->state_change_timestamp.monotonic, n->timeout_usec)); |
60f067b4 JS |
372 | if (r < 0) |
373 | return r; | |
374 | } | |
375 | ||
376 | if (IN_SET(n->deserialized_state, BUSNAME_MAKING, BUSNAME_LISTENING, BUSNAME_REGISTERED, BUSNAME_RUNNING)) { | |
377 | r = busname_open_fd(n); | |
378 | if (r < 0) | |
379 | return r; | |
380 | } | |
381 | ||
382 | if (n->deserialized_state == BUSNAME_LISTENING) { | |
383 | r = busname_watch_fd(n); | |
384 | if (r < 0) | |
385 | return r; | |
386 | } | |
387 | ||
388 | busname_set_state(n, n->deserialized_state); | |
389 | return 0; | |
390 | } | |
391 | ||
392 | static int busname_make_starter(BusName *n, pid_t *_pid) { | |
393 | pid_t pid; | |
394 | int r; | |
395 | ||
4c89c718 | 396 | r = busname_arm_timer(n, usec_add(now(CLOCK_MONOTONIC), n->timeout_usec)); |
60f067b4 JS |
397 | if (r < 0) |
398 | goto fail; | |
399 | ||
400 | /* We have to resolve the user/group names out-of-process, | |
401 | * hence let's fork here. It's messy, but well, what can we | |
402 | * do? */ | |
403 | ||
404 | pid = fork(); | |
405 | if (pid < 0) | |
406 | return -errno; | |
407 | ||
408 | if (pid == 0) { | |
409 | int ret; | |
410 | ||
86f210e9 MP |
411 | (void) default_signals(SIGNALS_CRASH_HANDLER, SIGNALS_IGNORE, -1); |
412 | (void) ignore_signals(SIGPIPE, -1); | |
60f067b4 JS |
413 | log_forget_fds(); |
414 | ||
415 | r = bus_kernel_make_starter(n->starter_fd, n->name, n->activating, n->accept_fd, n->policy, n->policy_world); | |
416 | if (r < 0) { | |
417 | ret = EXIT_MAKE_STARTER; | |
418 | goto fail_child; | |
419 | } | |
420 | ||
421 | _exit(0); | |
422 | ||
423 | fail_child: | |
424 | log_open(); | |
f47781d8 | 425 | log_error_errno(r, "Failed to create starter connection at step %s: %m", exit_status_to_string(ret, EXIT_STATUS_SYSTEMD)); |
60f067b4 JS |
426 | |
427 | _exit(ret); | |
428 | } | |
429 | ||
430 | r = unit_watch_pid(UNIT(n), pid); | |
431 | if (r < 0) | |
432 | goto fail; | |
433 | ||
434 | *_pid = pid; | |
435 | return 0; | |
436 | ||
437 | fail: | |
438 | n->timer_event_source = sd_event_source_unref(n->timer_event_source); | |
439 | return r; | |
440 | } | |
441 | ||
442 | static void busname_enter_dead(BusName *n, BusNameResult f) { | |
443 | assert(n); | |
444 | ||
445 | if (f != BUSNAME_SUCCESS) | |
446 | n->result = f; | |
447 | ||
448 | busname_set_state(n, n->result != BUSNAME_SUCCESS ? BUSNAME_FAILED : BUSNAME_DEAD); | |
449 | } | |
450 | ||
451 | static void busname_enter_signal(BusName *n, BusNameState state, BusNameResult f) { | |
452 | KillContext kill_context = {}; | |
453 | int r; | |
454 | ||
455 | assert(n); | |
456 | ||
457 | if (f != BUSNAME_SUCCESS) | |
458 | n->result = f; | |
459 | ||
460 | kill_context_init(&kill_context); | |
461 | ||
462 | r = unit_kill_context(UNIT(n), | |
463 | &kill_context, | |
5eef597e | 464 | state != BUSNAME_SIGTERM ? KILL_KILL : KILL_TERMINATE, |
60f067b4 JS |
465 | -1, |
466 | n->control_pid, | |
467 | false); | |
468 | if (r < 0) { | |
e3bff60a | 469 | log_unit_warning_errno(UNIT(n), r, "Failed to kill control process: %m"); |
60f067b4 JS |
470 | goto fail; |
471 | } | |
472 | ||
473 | if (r > 0) { | |
4c89c718 | 474 | r = busname_arm_timer(n, usec_add(now(CLOCK_MONOTONIC), n->timeout_usec)); |
60f067b4 | 475 | if (r < 0) { |
e3bff60a | 476 | log_unit_warning_errno(UNIT(n), r, "Failed to arm timer: %m"); |
60f067b4 JS |
477 | goto fail; |
478 | } | |
479 | ||
480 | busname_set_state(n, state); | |
481 | } else if (state == BUSNAME_SIGTERM) | |
482 | busname_enter_signal(n, BUSNAME_SIGKILL, BUSNAME_SUCCESS); | |
483 | else | |
484 | busname_enter_dead(n, BUSNAME_SUCCESS); | |
485 | ||
486 | return; | |
487 | ||
488 | fail: | |
489 | busname_enter_dead(n, BUSNAME_FAILURE_RESOURCES); | |
490 | } | |
491 | ||
492 | static void busname_enter_listening(BusName *n) { | |
493 | int r; | |
494 | ||
495 | assert(n); | |
496 | ||
497 | if (n->activating) { | |
498 | r = busname_watch_fd(n); | |
499 | if (r < 0) { | |
e3bff60a | 500 | log_unit_warning_errno(UNIT(n), r, "Failed to watch names: %m"); |
60f067b4 JS |
501 | goto fail; |
502 | } | |
503 | ||
504 | busname_set_state(n, BUSNAME_LISTENING); | |
505 | } else | |
506 | busname_set_state(n, BUSNAME_REGISTERED); | |
507 | ||
508 | return; | |
509 | ||
510 | fail: | |
511 | busname_enter_signal(n, BUSNAME_SIGTERM, BUSNAME_FAILURE_RESOURCES); | |
512 | } | |
513 | ||
514 | static void busname_enter_making(BusName *n) { | |
515 | int r; | |
516 | ||
517 | assert(n); | |
518 | ||
519 | r = busname_open_fd(n); | |
520 | if (r < 0) | |
521 | goto fail; | |
522 | ||
523 | if (n->policy) { | |
e842803a | 524 | /* If there is a policy, we need to resolve user/group |
60f067b4 JS |
525 | * names, which we can't do from PID1, hence let's |
526 | * fork. */ | |
527 | busname_unwatch_control_pid(n); | |
528 | ||
529 | r = busname_make_starter(n, &n->control_pid); | |
530 | if (r < 0) { | |
e3bff60a | 531 | log_unit_warning_errno(UNIT(n), r, "Failed to fork 'making' task: %m"); |
60f067b4 JS |
532 | goto fail; |
533 | } | |
534 | ||
535 | busname_set_state(n, BUSNAME_MAKING); | |
536 | } else { | |
e842803a | 537 | /* If there is no policy, we can do everything |
60f067b4 JS |
538 | * directly from PID 1, hence do so. */ |
539 | ||
540 | r = bus_kernel_make_starter(n->starter_fd, n->name, n->activating, n->accept_fd, NULL, n->policy_world); | |
541 | if (r < 0) { | |
e3bff60a | 542 | log_unit_warning_errno(UNIT(n), r, "Failed to make starter: %m"); |
60f067b4 JS |
543 | goto fail; |
544 | } | |
545 | ||
546 | busname_enter_listening(n); | |
547 | } | |
548 | ||
549 | return; | |
550 | ||
551 | fail: | |
552 | busname_enter_dead(n, BUSNAME_FAILURE_RESOURCES); | |
553 | } | |
554 | ||
555 | static void busname_enter_running(BusName *n) { | |
4c89c718 | 556 | _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; |
60f067b4 JS |
557 | bool pending = false; |
558 | Unit *other; | |
559 | Iterator i; | |
560 | int r; | |
561 | ||
562 | assert(n); | |
563 | ||
564 | if (!n->activating) | |
565 | return; | |
566 | ||
e3bff60a | 567 | /* We don't take connections anymore if we are supposed to |
60f067b4 JS |
568 | * shut down anyway */ |
569 | ||
570 | if (unit_stop_pending(UNIT(n))) { | |
e3bff60a | 571 | log_unit_debug(UNIT(n), "Suppressing activation request since unit stop is scheduled."); |
60f067b4 JS |
572 | |
573 | /* Flush all queued activation reqeuest by closing and reopening the connection */ | |
574 | bus_kernel_drop_one(n->starter_fd); | |
575 | ||
576 | busname_enter_listening(n); | |
577 | return; | |
578 | } | |
579 | ||
580 | /* If there's already a start pending don't bother to do | |
581 | * anything */ | |
582 | SET_FOREACH(other, UNIT(n)->dependencies[UNIT_TRIGGERS], i) | |
583 | if (unit_active_or_pending(other)) { | |
584 | pending = true; | |
585 | break; | |
586 | } | |
587 | ||
588 | if (!pending) { | |
db2df898 MP |
589 | if (!UNIT_ISSET(n->service)) { |
590 | log_unit_error(UNIT(n), "Service to activate vanished, refusing activation."); | |
591 | r = -ENOENT; | |
592 | goto fail; | |
593 | } | |
594 | ||
595 | r = manager_add_job(UNIT(n)->manager, JOB_START, UNIT_DEREF(n->service), JOB_REPLACE, &error, NULL); | |
60f067b4 JS |
596 | if (r < 0) |
597 | goto fail; | |
598 | } | |
599 | ||
600 | busname_set_state(n, BUSNAME_RUNNING); | |
601 | return; | |
602 | ||
603 | fail: | |
e3bff60a | 604 | log_unit_warning(UNIT(n), "Failed to queue service startup job: %s", bus_error_message(&error, r)); |
60f067b4 JS |
605 | busname_enter_dead(n, BUSNAME_FAILURE_RESOURCES); |
606 | } | |
607 | ||
608 | static int busname_start(Unit *u) { | |
609 | BusName *n = BUSNAME(u); | |
610 | ||
611 | assert(n); | |
612 | ||
613 | /* We cannot fulfill this request right now, try again later | |
614 | * please! */ | |
615 | if (IN_SET(n->state, BUSNAME_SIGTERM, BUSNAME_SIGKILL)) | |
616 | return -EAGAIN; | |
617 | ||
618 | /* Already on it! */ | |
619 | if (n->state == BUSNAME_MAKING) | |
620 | return 0; | |
621 | ||
622 | if (n->activating && UNIT_ISSET(n->service)) { | |
623 | Service *service; | |
624 | ||
625 | service = SERVICE(UNIT_DEREF(n->service)); | |
626 | ||
627 | if (UNIT(service)->load_state != UNIT_LOADED) { | |
e3bff60a | 628 | log_unit_error(u, "Bus service %s not loaded, refusing.", UNIT(service)->id); |
60f067b4 JS |
629 | return -ENOENT; |
630 | } | |
631 | } | |
632 | ||
633 | assert(IN_SET(n->state, BUSNAME_DEAD, BUSNAME_FAILED)); | |
634 | ||
635 | n->result = BUSNAME_SUCCESS; | |
636 | busname_enter_making(n); | |
637 | ||
e735f4d4 | 638 | return 1; |
60f067b4 JS |
639 | } |
640 | ||
641 | static int busname_stop(Unit *u) { | |
642 | BusName *n = BUSNAME(u); | |
643 | ||
644 | assert(n); | |
645 | ||
646 | /* Already on it */ | |
647 | if (IN_SET(n->state, BUSNAME_SIGTERM, BUSNAME_SIGKILL)) | |
648 | return 0; | |
649 | ||
650 | /* If there's already something running, we go directly into | |
651 | * kill mode. */ | |
652 | ||
653 | if (n->state == BUSNAME_MAKING) { | |
654 | busname_enter_signal(n, BUSNAME_SIGTERM, BUSNAME_SUCCESS); | |
655 | return -EAGAIN; | |
656 | } | |
657 | ||
658 | assert(IN_SET(n->state, BUSNAME_REGISTERED, BUSNAME_LISTENING, BUSNAME_RUNNING)); | |
659 | ||
660 | busname_enter_dead(n, BUSNAME_SUCCESS); | |
e735f4d4 | 661 | return 1; |
60f067b4 JS |
662 | } |
663 | ||
664 | static int busname_serialize(Unit *u, FILE *f, FDSet *fds) { | |
665 | BusName *n = BUSNAME(u); | |
db2df898 | 666 | int r; |
60f067b4 JS |
667 | |
668 | assert(n); | |
669 | assert(f); | |
670 | assert(fds); | |
671 | ||
672 | unit_serialize_item(u, f, "state", busname_state_to_string(n->state)); | |
673 | unit_serialize_item(u, f, "result", busname_result_to_string(n->result)); | |
674 | ||
675 | if (n->control_pid > 0) | |
676 | unit_serialize_item_format(u, f, "control-pid", PID_FMT, n->control_pid); | |
677 | ||
db2df898 MP |
678 | r = unit_serialize_item_fd(u, f, fds, "starter-fd", n->starter_fd); |
679 | if (r < 0) | |
680 | return r; | |
60f067b4 JS |
681 | |
682 | return 0; | |
683 | } | |
684 | ||
685 | static int busname_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { | |
686 | BusName *n = BUSNAME(u); | |
687 | ||
688 | assert(n); | |
689 | assert(key); | |
690 | assert(value); | |
691 | ||
692 | if (streq(key, "state")) { | |
693 | BusNameState state; | |
694 | ||
695 | state = busname_state_from_string(value); | |
696 | if (state < 0) | |
e3bff60a | 697 | log_unit_debug(u, "Failed to parse state value: %s", value); |
60f067b4 JS |
698 | else |
699 | n->deserialized_state = state; | |
700 | ||
701 | } else if (streq(key, "result")) { | |
702 | BusNameResult f; | |
703 | ||
704 | f = busname_result_from_string(value); | |
705 | if (f < 0) | |
e3bff60a | 706 | log_unit_debug(u, "Failed to parse result value: %s", value); |
60f067b4 JS |
707 | else if (f != BUSNAME_SUCCESS) |
708 | n->result = f; | |
709 | ||
710 | } else if (streq(key, "control-pid")) { | |
711 | pid_t pid; | |
712 | ||
713 | if (parse_pid(value, &pid) < 0) | |
e3bff60a | 714 | log_unit_debug(u, "Failed to parse control-pid value: %s", value); |
60f067b4 JS |
715 | else |
716 | n->control_pid = pid; | |
717 | } else if (streq(key, "starter-fd")) { | |
718 | int fd; | |
719 | ||
720 | if (safe_atoi(value, &fd) < 0 || fd < 0 || !fdset_contains(fds, fd)) | |
e3bff60a | 721 | log_unit_debug(u, "Failed to parse starter fd value: %s", value); |
60f067b4 JS |
722 | else { |
723 | safe_close(n->starter_fd); | |
724 | n->starter_fd = fdset_remove(fds, fd); | |
725 | } | |
726 | } else | |
e3bff60a | 727 | log_unit_debug(u, "Unknown serialization key: %s", key); |
60f067b4 JS |
728 | |
729 | return 0; | |
730 | } | |
731 | ||
732 | _pure_ static UnitActiveState busname_active_state(Unit *u) { | |
733 | assert(u); | |
734 | ||
735 | return state_translation_table[BUSNAME(u)->state]; | |
736 | } | |
737 | ||
738 | _pure_ static const char *busname_sub_state_to_string(Unit *u) { | |
739 | assert(u); | |
740 | ||
741 | return busname_state_to_string(BUSNAME(u)->state); | |
742 | } | |
743 | ||
f47781d8 MP |
744 | static int busname_peek_message(BusName *n) { |
745 | struct kdbus_cmd_recv cmd_recv = { | |
e735f4d4 | 746 | .size = sizeof(cmd_recv), |
f47781d8 MP |
747 | .flags = KDBUS_RECV_PEEK, |
748 | }; | |
e735f4d4 MP |
749 | struct kdbus_cmd_free cmd_free = { |
750 | .size = sizeof(cmd_free), | |
751 | }; | |
f47781d8 MP |
752 | const char *comm = NULL; |
753 | struct kdbus_item *d; | |
754 | struct kdbus_msg *k; | |
755 | size_t start, ps, sz, delta; | |
756 | void *p = NULL; | |
757 | pid_t pid = 0; | |
758 | int r; | |
759 | ||
760 | /* Generate a friendly debug log message about which process | |
761 | * caused triggering of this bus name. This simply peeks the | |
762 | * metadata of the first queued message and logs it. */ | |
763 | ||
764 | assert(n); | |
765 | ||
766 | /* Let's shortcut things a bit, if debug logging is turned off | |
767 | * anyway. */ | |
768 | ||
769 | if (log_get_max_level() < LOG_DEBUG) | |
770 | return 0; | |
771 | ||
e735f4d4 | 772 | r = ioctl(n->starter_fd, KDBUS_CMD_RECV, &cmd_recv); |
f47781d8 MP |
773 | if (r < 0) { |
774 | if (errno == EINTR || errno == EAGAIN) | |
775 | return 0; | |
776 | ||
e3bff60a | 777 | return log_unit_error_errno(UNIT(n), errno, "Failed to query activation message: %m"); |
f47781d8 MP |
778 | } |
779 | ||
780 | /* We map as late as possible, and unmap imemdiately after | |
781 | * use. On 32bit address space is scarce and we want to be | |
782 | * able to handle a lot of activator connections at the same | |
783 | * time, and hence shouldn't keep the mmap()s around for | |
784 | * longer than necessary. */ | |
785 | ||
786 | ps = page_size(); | |
e735f4d4 MP |
787 | start = (cmd_recv.msg.offset / ps) * ps; |
788 | delta = cmd_recv.msg.offset - start; | |
789 | sz = PAGE_ALIGN(delta + cmd_recv.msg.msg_size); | |
f47781d8 MP |
790 | |
791 | p = mmap(NULL, sz, PROT_READ, MAP_SHARED, n->starter_fd, start); | |
792 | if (p == MAP_FAILED) { | |
e3bff60a | 793 | r = log_unit_error_errno(UNIT(n), errno, "Failed to map activation message: %m"); |
f47781d8 MP |
794 | goto finish; |
795 | } | |
796 | ||
797 | k = (struct kdbus_msg *) ((uint8_t *) p + delta); | |
798 | KDBUS_ITEM_FOREACH(d, k, items) { | |
799 | switch (d->type) { | |
800 | ||
801 | case KDBUS_ITEM_PIDS: | |
802 | pid = d->pids.pid; | |
803 | break; | |
804 | ||
805 | case KDBUS_ITEM_PID_COMM: | |
806 | comm = d->str; | |
807 | break; | |
808 | } | |
809 | } | |
810 | ||
811 | if (pid > 0) | |
e3bff60a | 812 | log_unit_debug(UNIT(n), "Activation triggered by process " PID_FMT " (%s)", pid, strna(comm)); |
f47781d8 MP |
813 | |
814 | r = 0; | |
815 | ||
816 | finish: | |
817 | if (p) | |
818 | (void) munmap(p, sz); | |
819 | ||
e735f4d4 | 820 | cmd_free.offset = cmd_recv.msg.offset; |
f47781d8 | 821 | if (ioctl(n->starter_fd, KDBUS_CMD_FREE, &cmd_free) < 0) |
e3bff60a | 822 | log_unit_warning(UNIT(n), "Failed to free peeked message, ignoring: %m"); |
f47781d8 MP |
823 | |
824 | return r; | |
825 | } | |
826 | ||
60f067b4 JS |
827 | static int busname_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) { |
828 | BusName *n = userdata; | |
829 | ||
830 | assert(n); | |
831 | assert(fd >= 0); | |
832 | ||
833 | if (n->state != BUSNAME_LISTENING) | |
834 | return 0; | |
835 | ||
e3bff60a | 836 | log_unit_debug(UNIT(n), "Activation request"); |
60f067b4 JS |
837 | |
838 | if (revents != EPOLLIN) { | |
e3bff60a | 839 | log_unit_error(UNIT(n), "Got unexpected poll event (0x%x) on starter fd.", revents); |
60f067b4 JS |
840 | goto fail; |
841 | } | |
842 | ||
f47781d8 | 843 | busname_peek_message(n); |
60f067b4 JS |
844 | busname_enter_running(n); |
845 | return 0; | |
846 | fail: | |
847 | ||
848 | busname_enter_dead(n, BUSNAME_FAILURE_RESOURCES); | |
849 | return 0; | |
850 | } | |
851 | ||
852 | static void busname_sigchld_event(Unit *u, pid_t pid, int code, int status) { | |
853 | BusName *n = BUSNAME(u); | |
854 | BusNameResult f; | |
855 | ||
856 | assert(n); | |
857 | assert(pid >= 0); | |
858 | ||
859 | if (pid != n->control_pid) | |
860 | return; | |
861 | ||
862 | n->control_pid = 0; | |
863 | ||
864 | if (is_clean_exit(code, status, NULL)) | |
865 | f = BUSNAME_SUCCESS; | |
866 | else if (code == CLD_EXITED) | |
867 | f = BUSNAME_FAILURE_EXIT_CODE; | |
868 | else if (code == CLD_KILLED) | |
869 | f = BUSNAME_FAILURE_SIGNAL; | |
5eef597e | 870 | else if (code == CLD_DUMPED) |
60f067b4 JS |
871 | f = BUSNAME_FAILURE_CORE_DUMP; |
872 | else | |
873 | assert_not_reached("Unknown sigchld code"); | |
874 | ||
e3bff60a MP |
875 | log_unit_full(u, f == BUSNAME_SUCCESS ? LOG_DEBUG : LOG_NOTICE, 0, |
876 | "Control process exited, code=%s status=%i", sigchld_code_to_string(code), status); | |
60f067b4 JS |
877 | |
878 | if (f != BUSNAME_SUCCESS) | |
879 | n->result = f; | |
880 | ||
881 | switch (n->state) { | |
882 | ||
883 | case BUSNAME_MAKING: | |
884 | if (f == BUSNAME_SUCCESS) | |
885 | busname_enter_listening(n); | |
886 | else | |
887 | busname_enter_signal(n, BUSNAME_SIGTERM, f); | |
888 | break; | |
889 | ||
890 | case BUSNAME_SIGTERM: | |
891 | case BUSNAME_SIGKILL: | |
892 | busname_enter_dead(n, f); | |
893 | break; | |
894 | ||
895 | default: | |
896 | assert_not_reached("Uh, control process died at wrong time."); | |
897 | } | |
898 | ||
899 | /* Notify clients about changed exit status */ | |
900 | unit_add_to_dbus_queue(u); | |
901 | } | |
902 | ||
903 | static int busname_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) { | |
904 | BusName *n = BUSNAME(userdata); | |
905 | ||
906 | assert(n); | |
907 | assert(n->timer_event_source == source); | |
908 | ||
909 | switch (n->state) { | |
910 | ||
911 | case BUSNAME_MAKING: | |
e3bff60a | 912 | log_unit_warning(UNIT(n), "Making timed out. Terminating."); |
60f067b4 JS |
913 | busname_enter_signal(n, BUSNAME_SIGTERM, BUSNAME_FAILURE_TIMEOUT); |
914 | break; | |
915 | ||
916 | case BUSNAME_SIGTERM: | |
e3bff60a | 917 | log_unit_warning(UNIT(n), "Stopping timed out. Killing."); |
60f067b4 JS |
918 | busname_enter_signal(n, BUSNAME_SIGKILL, BUSNAME_FAILURE_TIMEOUT); |
919 | break; | |
920 | ||
921 | case BUSNAME_SIGKILL: | |
e3bff60a | 922 | log_unit_warning(UNIT(n), "Processes still around after SIGKILL. Ignoring."); |
60f067b4 JS |
923 | busname_enter_dead(n, BUSNAME_FAILURE_TIMEOUT); |
924 | break; | |
925 | ||
926 | default: | |
927 | assert_not_reached("Timeout at wrong time."); | |
928 | } | |
929 | ||
930 | return 0; | |
931 | } | |
932 | ||
933 | static void busname_reset_failed(Unit *u) { | |
934 | BusName *n = BUSNAME(u); | |
935 | ||
936 | assert(n); | |
937 | ||
938 | if (n->state == BUSNAME_FAILED) | |
939 | busname_set_state(n, BUSNAME_DEAD); | |
940 | ||
941 | n->result = BUSNAME_SUCCESS; | |
942 | } | |
943 | ||
944 | static void busname_trigger_notify(Unit *u, Unit *other) { | |
945 | BusName *n = BUSNAME(u); | |
60f067b4 JS |
946 | |
947 | assert(n); | |
948 | assert(other); | |
949 | ||
950 | if (!IN_SET(n->state, BUSNAME_RUNNING, BUSNAME_LISTENING)) | |
951 | return; | |
952 | ||
4c89c718 MP |
953 | if (other->start_limit_hit) { |
954 | busname_enter_dead(n, BUSNAME_FAILURE_SERVICE_START_LIMIT_HIT); | |
60f067b4 | 955 | return; |
4c89c718 | 956 | } |
60f067b4 | 957 | |
4c89c718 MP |
958 | if (other->load_state != UNIT_LOADED || other->type != UNIT_SERVICE) |
959 | return; | |
60f067b4 | 960 | |
4c89c718 MP |
961 | if (IN_SET(SERVICE(other)->state, |
962 | SERVICE_DEAD, SERVICE_FAILED, | |
963 | SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL, | |
964 | SERVICE_AUTO_RESTART)) | |
60f067b4 | 965 | busname_enter_listening(n); |
4c89c718 MP |
966 | |
967 | if (SERVICE(other)->state == SERVICE_RUNNING) | |
968 | busname_set_state(n, BUSNAME_RUNNING); | |
60f067b4 JS |
969 | } |
970 | ||
971 | static int busname_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) { | |
972 | return unit_kill_common(u, who, signo, -1, BUSNAME(u)->control_pid, error); | |
973 | } | |
974 | ||
4c89c718 | 975 | static int busname_get_timeout(Unit *u, usec_t *timeout) { |
60f067b4 | 976 | BusName *n = BUSNAME(u); |
4c89c718 | 977 | usec_t t; |
60f067b4 JS |
978 | int r; |
979 | ||
980 | if (!n->timer_event_source) | |
981 | return 0; | |
982 | ||
4c89c718 | 983 | r = sd_event_source_get_time(n->timer_event_source, &t); |
60f067b4 JS |
984 | if (r < 0) |
985 | return r; | |
4c89c718 MP |
986 | if (t == USEC_INFINITY) |
987 | return 0; | |
60f067b4 | 988 | |
4c89c718 | 989 | *timeout = t; |
60f067b4 JS |
990 | return 1; |
991 | } | |
992 | ||
e3bff60a | 993 | static bool busname_supported(void) { |
e735f4d4 | 994 | static int supported = -1; |
e735f4d4 MP |
995 | |
996 | if (supported < 0) | |
e3bff60a | 997 | supported = is_kdbus_available(); |
e735f4d4 MP |
998 | |
999 | return supported; | |
1000 | } | |
1001 | ||
60f067b4 JS |
1002 | static const char* const busname_result_table[_BUSNAME_RESULT_MAX] = { |
1003 | [BUSNAME_SUCCESS] = "success", | |
1004 | [BUSNAME_FAILURE_RESOURCES] = "resources", | |
1005 | [BUSNAME_FAILURE_TIMEOUT] = "timeout", | |
1006 | [BUSNAME_FAILURE_EXIT_CODE] = "exit-code", | |
1007 | [BUSNAME_FAILURE_SIGNAL] = "signal", | |
1008 | [BUSNAME_FAILURE_CORE_DUMP] = "core-dump", | |
4c89c718 | 1009 | [BUSNAME_FAILURE_SERVICE_START_LIMIT_HIT] = "service-start-limit-hit", |
60f067b4 JS |
1010 | }; |
1011 | ||
1012 | DEFINE_STRING_TABLE_LOOKUP(busname_result, BusNameResult); | |
1013 | ||
60f067b4 JS |
1014 | const UnitVTable busname_vtable = { |
1015 | .object_size = sizeof(BusName), | |
1016 | ||
1017 | .sections = | |
1018 | "Unit\0" | |
1019 | "BusName\0" | |
1020 | "Install\0", | |
1021 | .private_section = "BusName", | |
1022 | ||
e3bff60a MP |
1023 | .no_alias = true, |
1024 | .no_instances = true, | |
1025 | ||
60f067b4 JS |
1026 | .init = busname_init, |
1027 | .done = busname_done, | |
1028 | .load = busname_load, | |
1029 | ||
1030 | .coldplug = busname_coldplug, | |
1031 | ||
1032 | .dump = busname_dump, | |
1033 | ||
1034 | .start = busname_start, | |
1035 | .stop = busname_stop, | |
1036 | ||
1037 | .kill = busname_kill, | |
1038 | ||
1039 | .get_timeout = busname_get_timeout, | |
1040 | ||
1041 | .serialize = busname_serialize, | |
1042 | .deserialize_item = busname_deserialize_item, | |
1043 | ||
1044 | .active_state = busname_active_state, | |
1045 | .sub_state_to_string = busname_sub_state_to_string, | |
1046 | ||
1047 | .sigchld_event = busname_sigchld_event, | |
1048 | ||
1049 | .trigger_notify = busname_trigger_notify, | |
1050 | ||
1051 | .reset_failed = busname_reset_failed, | |
1052 | ||
e735f4d4 MP |
1053 | .supported = busname_supported, |
1054 | ||
60f067b4 JS |
1055 | .bus_vtable = bus_busname_vtable, |
1056 | ||
1057 | .status_message_formats = { | |
1058 | .finished_start_job = { | |
1059 | [JOB_DONE] = "Listening on %s.", | |
1060 | [JOB_FAILED] = "Failed to listen on %s.", | |
60f067b4 JS |
1061 | }, |
1062 | .finished_stop_job = { | |
1063 | [JOB_DONE] = "Closed %s.", | |
1064 | [JOB_FAILED] = "Failed stopping %s.", | |
60f067b4 JS |
1065 | }, |
1066 | }, | |
1067 | }; |