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e821075a LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2013 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
bd5f920f LP |
22 | #include <sys/mman.h> |
23 | ||
e821075a | 24 | #include "special.h" |
24882e06 LP |
25 | #include "formats-util.h" |
26 | #include "signal-util.h" | |
e821075a LP |
27 | #include "bus-kernel.h" |
28 | #include "bus-internal.h" | |
29 | #include "bus-util.h" | |
3c70e3bb LP |
30 | #include "kdbus.h" |
31 | #include "bus-policy.h" | |
24882e06 | 32 | #include "service.h" |
e821075a LP |
33 | #include "dbus-busname.h" |
34 | #include "busname.h" | |
35 | ||
36 | static const UnitActiveState state_translation_table[_BUSNAME_STATE_MAX] = { | |
37 | [BUSNAME_DEAD] = UNIT_INACTIVE, | |
a4152e3f | 38 | [BUSNAME_MAKING] = UNIT_ACTIVATING, |
5892a914 | 39 | [BUSNAME_REGISTERED] = UNIT_ACTIVE, |
e821075a LP |
40 | [BUSNAME_LISTENING] = UNIT_ACTIVE, |
41 | [BUSNAME_RUNNING] = UNIT_ACTIVE, | |
a4152e3f LP |
42 | [BUSNAME_SIGTERM] = UNIT_DEACTIVATING, |
43 | [BUSNAME_SIGKILL] = UNIT_DEACTIVATING, | |
e821075a LP |
44 | [BUSNAME_FAILED] = UNIT_FAILED |
45 | }; | |
46 | ||
47 | static int busname_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata); | |
a4152e3f | 48 | static int busname_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata); |
e821075a LP |
49 | |
50 | static void busname_init(Unit *u) { | |
51 | BusName *n = BUSNAME(u); | |
52 | ||
53 | assert(u); | |
54 | assert(u->load_state == UNIT_STUB); | |
55 | ||
56 | n->starter_fd = -1; | |
3f9da416 | 57 | n->accept_fd = true; |
4f101180 | 58 | n->activating = true; |
a4152e3f LP |
59 | |
60 | n->timeout_usec = u->manager->default_timeout_start_usec; | |
61 | } | |
62 | ||
63 | static void busname_unwatch_control_pid(BusName *n) { | |
64 | assert(n); | |
65 | ||
66 | if (n->control_pid <= 0) | |
67 | return; | |
68 | ||
69 | unit_unwatch_pid(UNIT(n), n->control_pid); | |
70 | n->control_pid = 0; | |
71 | } | |
72 | ||
73 | static void busname_free_policy(BusName *n) { | |
74 | BusNamePolicy *p; | |
75 | ||
76 | assert(n); | |
77 | ||
78 | while ((p = n->policy)) { | |
79 | LIST_REMOVE(policy, n->policy, p); | |
80 | ||
81 | free(p->name); | |
82 | free(p); | |
83 | } | |
84 | } | |
85 | ||
86 | static void busname_close_fd(BusName *n) { | |
87 | assert(n); | |
88 | ||
89 | n->starter_event_source = sd_event_source_unref(n->starter_event_source); | |
90 | n->starter_fd = safe_close(n->starter_fd); | |
e821075a LP |
91 | } |
92 | ||
93 | static void busname_done(Unit *u) { | |
94 | BusName *n = BUSNAME(u); | |
95 | ||
a4152e3f | 96 | assert(n); |
e821075a LP |
97 | |
98 | free(n->name); | |
99 | n->name = NULL; | |
100 | ||
a4152e3f LP |
101 | busname_free_policy(n); |
102 | busname_unwatch_control_pid(n); | |
103 | busname_close_fd(n); | |
104 | ||
e821075a LP |
105 | unit_ref_unset(&n->service); |
106 | ||
a4152e3f LP |
107 | n->timer_event_source = sd_event_source_unref(n->timer_event_source); |
108 | } | |
109 | ||
110 | static int busname_arm_timer(BusName *n) { | |
111 | int r; | |
112 | ||
113 | assert(n); | |
114 | ||
115 | if (n->timeout_usec <= 0) { | |
116 | n->timer_event_source = sd_event_source_unref(n->timer_event_source); | |
117 | return 0; | |
118 | } | |
119 | ||
120 | if (n->timer_event_source) { | |
121 | r = sd_event_source_set_time(n->timer_event_source, now(CLOCK_MONOTONIC) + n->timeout_usec); | |
122 | if (r < 0) | |
123 | return r; | |
124 | ||
125 | return sd_event_source_set_enabled(n->timer_event_source, SD_EVENT_ONESHOT); | |
126 | } | |
127 | ||
920b52e4 | 128 | r = sd_event_add_time( |
a4152e3f LP |
129 | UNIT(n)->manager->event, |
130 | &n->timer_event_source, | |
131 | CLOCK_MONOTONIC, | |
132 | now(CLOCK_MONOTONIC) + n->timeout_usec, 0, | |
133 | busname_dispatch_timer, n); | |
7dfbe2e3 TG |
134 | if (r < 0) |
135 | return r; | |
136 | ||
137 | (void) sd_event_source_set_description(n->timer_event_source, "busname-timer"); | |
138 | ||
139 | return 0; | |
e821075a LP |
140 | } |
141 | ||
142 | static int busname_add_default_default_dependencies(BusName *n) { | |
143 | int r; | |
144 | ||
145 | assert(n); | |
146 | ||
147 | r = unit_add_dependency_by_name(UNIT(n), UNIT_BEFORE, SPECIAL_BUSNAMES_TARGET, NULL, true); | |
148 | if (r < 0) | |
149 | return r; | |
150 | ||
b2c23da8 | 151 | if (UNIT(n)->manager->running_as == MANAGER_SYSTEM) { |
e821075a LP |
152 | r = unit_add_two_dependencies_by_name(UNIT(n), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SYSINIT_TARGET, NULL, true); |
153 | if (r < 0) | |
154 | return r; | |
155 | } | |
156 | ||
157 | return unit_add_two_dependencies_by_name(UNIT(n), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, NULL, true); | |
158 | } | |
159 | ||
160 | static int busname_add_extras(BusName *n) { | |
161 | Unit *u = UNIT(n); | |
162 | int r; | |
163 | ||
164 | assert(n); | |
165 | ||
166 | if (!n->name) { | |
7410616c LP |
167 | r = unit_name_to_prefix(u->id, &n->name); |
168 | if (r < 0) | |
169 | return r; | |
e821075a LP |
170 | } |
171 | ||
172 | if (!u->description) { | |
173 | r = unit_set_description(u, n->name); | |
174 | if (r < 0) | |
175 | return r; | |
176 | } | |
177 | ||
5892a914 DM |
178 | if (n->activating) { |
179 | if (!UNIT_DEREF(n->service)) { | |
180 | Unit *x; | |
e821075a | 181 | |
5892a914 DM |
182 | r = unit_load_related_unit(u, ".service", &x); |
183 | if (r < 0) | |
184 | return r; | |
185 | ||
186 | unit_ref_set(&n->service, x); | |
187 | } | |
188 | ||
189 | r = unit_add_two_dependencies(u, UNIT_BEFORE, UNIT_TRIGGERS, UNIT_DEREF(n->service), true); | |
e821075a LP |
190 | if (r < 0) |
191 | return r; | |
e821075a LP |
192 | } |
193 | ||
e821075a LP |
194 | if (u->default_dependencies) { |
195 | r = busname_add_default_default_dependencies(n); | |
196 | if (r < 0) | |
197 | return r; | |
198 | } | |
199 | ||
200 | return 0; | |
201 | } | |
202 | ||
e821075a LP |
203 | static int busname_verify(BusName *n) { |
204 | char *e; | |
205 | ||
206 | assert(n); | |
207 | ||
208 | if (UNIT(n)->load_state != UNIT_LOADED) | |
209 | return 0; | |
210 | ||
211 | if (!service_name_is_valid(n->name)) { | |
f2341e0a | 212 | log_unit_error(UNIT(n), "Name= setting is not a valid service name Refusing."); |
e821075a LP |
213 | return -EINVAL; |
214 | } | |
215 | ||
63c372cb | 216 | e = strjoina(n->name, ".busname"); |
e821075a | 217 | if (!unit_has_name(UNIT(n), e)) { |
f2341e0a | 218 | log_unit_error(UNIT(n), "Name= setting doesn't match unit name. Refusing."); |
e821075a LP |
219 | return -EINVAL; |
220 | } | |
221 | ||
222 | return 0; | |
223 | } | |
224 | ||
225 | static int busname_load(Unit *u) { | |
226 | BusName *n = BUSNAME(u); | |
227 | int r; | |
228 | ||
229 | assert(u); | |
230 | assert(u->load_state == UNIT_STUB); | |
231 | ||
232 | r = unit_load_fragment_and_dropin(u); | |
233 | if (r < 0) | |
234 | return r; | |
235 | ||
236 | if (u->load_state == UNIT_LOADED) { | |
237 | /* This is a new unit? Then let's add in some extras */ | |
238 | r = busname_add_extras(n); | |
239 | if (r < 0) | |
240 | return r; | |
241 | } | |
242 | ||
243 | return busname_verify(n); | |
244 | } | |
245 | ||
246 | static void busname_dump(Unit *u, FILE *f, const char *prefix) { | |
247 | BusName *n = BUSNAME(u); | |
248 | ||
249 | assert(n); | |
250 | assert(f); | |
251 | ||
252 | fprintf(f, | |
253 | "%sBus Name State: %s\n" | |
254 | "%sResult: %s\n" | |
3f9da416 | 255 | "%sName: %s\n" |
5892a914 | 256 | "%sActivating: %s\n" |
3f9da416 | 257 | "%sAccept FD: %s\n", |
e821075a LP |
258 | prefix, busname_state_to_string(n->state), |
259 | prefix, busname_result_to_string(n->result), | |
3f9da416 | 260 | prefix, n->name, |
5892a914 | 261 | prefix, yes_no(n->activating), |
3f9da416 | 262 | prefix, yes_no(n->accept_fd)); |
a4152e3f LP |
263 | |
264 | if (n->control_pid > 0) | |
265 | fprintf(f, | |
266 | "%sControl PID: "PID_FMT"\n", | |
267 | prefix, n->control_pid); | |
e821075a LP |
268 | } |
269 | ||
270 | static void busname_unwatch_fd(BusName *n) { | |
271 | int r; | |
272 | ||
273 | assert(n); | |
274 | ||
a4152e3f | 275 | if (!n->starter_event_source) |
e821075a LP |
276 | return; |
277 | ||
a4152e3f LP |
278 | r = sd_event_source_set_enabled(n->starter_event_source, SD_EVENT_OFF); |
279 | if (r < 0) | |
f2341e0a | 280 | log_unit_debug_errno(UNIT(n), r, "Failed to disable event source: %m"); |
e821075a LP |
281 | } |
282 | ||
283 | static int busname_watch_fd(BusName *n) { | |
284 | int r; | |
285 | ||
286 | assert(n); | |
287 | ||
288 | if (n->starter_fd < 0) | |
289 | return 0; | |
290 | ||
cbf60d0a | 291 | if (n->starter_event_source) { |
a4152e3f | 292 | r = sd_event_source_set_enabled(n->starter_event_source, SD_EVENT_ON); |
cbf60d0a LP |
293 | if (r < 0) |
294 | goto fail; | |
295 | } else { | |
a4152e3f | 296 | r = sd_event_add_io(UNIT(n)->manager->event, &n->starter_event_source, n->starter_fd, EPOLLIN, busname_dispatch_io, n); |
cbf60d0a LP |
297 | if (r < 0) |
298 | goto fail; | |
cfa9677b | 299 | |
cbf60d0a | 300 | (void) sd_event_source_set_description(n->starter_event_source, "busname-starter"); |
e821075a LP |
301 | } |
302 | ||
303 | return 0; | |
cbf60d0a LP |
304 | |
305 | fail: | |
306 | log_unit_warning_errno(UNIT(n), r, "Failed to watch starter fd: %m"); | |
307 | busname_unwatch_fd(n); | |
308 | return r; | |
e821075a LP |
309 | } |
310 | ||
311 | static int busname_open_fd(BusName *n) { | |
8f077bf9 ZJS |
312 | _cleanup_free_ char *path = NULL; |
313 | const char *mode; | |
314 | ||
e821075a LP |
315 | assert(n); |
316 | ||
317 | if (n->starter_fd >= 0) | |
318 | return 0; | |
319 | ||
b2c23da8 | 320 | mode = UNIT(n)->manager->running_as == MANAGER_SYSTEM ? "system" : "user"; |
8f077bf9 | 321 | n->starter_fd = bus_kernel_open_bus_fd(mode, &path); |
23bbb0de | 322 | if (n->starter_fd < 0) |
f2341e0a | 323 | return log_unit_warning_errno(UNIT(n), n->starter_fd, "Failed to open %s: %m", path ?: "kdbus"); |
e821075a LP |
324 | |
325 | return 0; | |
326 | } | |
327 | ||
328 | static void busname_set_state(BusName *n, BusNameState state) { | |
329 | BusNameState old_state; | |
330 | assert(n); | |
331 | ||
332 | old_state = n->state; | |
333 | n->state = state; | |
334 | ||
a4152e3f LP |
335 | if (!IN_SET(state, BUSNAME_MAKING, BUSNAME_SIGTERM, BUSNAME_SIGKILL)) { |
336 | n->timer_event_source = sd_event_source_unref(n->timer_event_source); | |
337 | busname_unwatch_control_pid(n); | |
338 | } | |
339 | ||
e821075a LP |
340 | if (state != BUSNAME_LISTENING) |
341 | busname_unwatch_fd(n); | |
342 | ||
a4152e3f | 343 | if (!IN_SET(state, BUSNAME_LISTENING, BUSNAME_MAKING, BUSNAME_REGISTERED, BUSNAME_RUNNING)) |
e821075a LP |
344 | busname_close_fd(n); |
345 | ||
346 | if (state != old_state) | |
f2341e0a | 347 | log_unit_debug(UNIT(n), "Changed %s -> %s", busname_state_to_string(old_state), busname_state_to_string(state)); |
e821075a LP |
348 | |
349 | unit_notify(UNIT(n), state_translation_table[old_state], state_translation_table[state], true); | |
350 | } | |
351 | ||
be847e82 | 352 | static int busname_coldplug(Unit *u) { |
e821075a LP |
353 | BusName *n = BUSNAME(u); |
354 | int r; | |
355 | ||
356 | assert(n); | |
357 | assert(n->state == BUSNAME_DEAD); | |
358 | ||
359 | if (n->deserialized_state == n->state) | |
360 | return 0; | |
361 | ||
a4152e3f LP |
362 | if (IN_SET(n->deserialized_state, BUSNAME_MAKING, BUSNAME_SIGTERM, BUSNAME_SIGKILL)) { |
363 | ||
364 | if (n->control_pid <= 0) | |
365 | return -EBADMSG; | |
366 | ||
367 | r = unit_watch_pid(UNIT(n), n->control_pid); | |
368 | if (r < 0) | |
369 | return r; | |
370 | ||
371 | r = busname_arm_timer(n); | |
372 | if (r < 0) | |
373 | return r; | |
374 | } | |
375 | ||
376 | if (IN_SET(n->deserialized_state, BUSNAME_MAKING, BUSNAME_LISTENING, BUSNAME_REGISTERED, BUSNAME_RUNNING)) { | |
e821075a LP |
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 | ||
a4152e3f LP |
392 | static int busname_make_starter(BusName *n, pid_t *_pid) { |
393 | pid_t pid; | |
394 | int r; | |
395 | ||
396 | r = busname_arm_timer(n); | |
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 | ||
ce30c8dc LP |
411 | (void) default_signals(SIGNALS_CRASH_HANDLER, SIGNALS_IGNORE, -1); |
412 | (void) ignore_signals(SIGPIPE, -1); | |
a4152e3f LP |
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(); | |
da927ba9 | 425 | log_error_errno(r, "Failed to create starter connection at step %s: %m", exit_status_to_string(ret, EXIT_STATUS_SYSTEMD)); |
a4152e3f LP |
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 | ||
e821075a LP |
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 | ||
a4152e3f LP |
451 | static void busname_enter_signal(BusName *n, BusNameState state, BusNameResult f) { |
452 | KillContext kill_context = {}; | |
e821075a LP |
453 | int r; |
454 | ||
455 | assert(n); | |
456 | ||
a4152e3f LP |
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, | |
db2cb23b | 464 | state != BUSNAME_SIGTERM ? KILL_KILL : KILL_TERMINATE, |
a4152e3f LP |
465 | -1, |
466 | n->control_pid, | |
467 | false); | |
e821075a | 468 | if (r < 0) { |
f2341e0a | 469 | log_unit_warning_errno(UNIT(n), r, "Failed to kill control process: %m"); |
e821075a LP |
470 | goto fail; |
471 | } | |
472 | ||
a4152e3f LP |
473 | if (r > 0) { |
474 | r = busname_arm_timer(n); | |
475 | if (r < 0) { | |
f2341e0a | 476 | log_unit_warning_errno(UNIT(n), r, "Failed to arm timer: %m"); |
a4152e3f LP |
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 | ||
5892a914 DM |
497 | if (n->activating) { |
498 | r = busname_watch_fd(n); | |
499 | if (r < 0) { | |
f2341e0a | 500 | log_unit_warning_errno(UNIT(n), r, "Failed to watch names: %m"); |
5892a914 DM |
501 | goto fail; |
502 | } | |
503 | ||
504 | busname_set_state(n, BUSNAME_LISTENING); | |
505 | } else | |
506 | busname_set_state(n, BUSNAME_REGISTERED); | |
e821075a | 507 | |
e821075a LP |
508 | return; |
509 | ||
a4152e3f LP |
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) { | |
8d0e0ddd | 524 | /* If there is a policy, we need to resolve user/group |
a4152e3f LP |
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) { | |
f2341e0a | 531 | log_unit_warning_errno(UNIT(n), r, "Failed to fork 'making' task: %m"); |
a4152e3f LP |
532 | goto fail; |
533 | } | |
534 | ||
535 | busname_set_state(n, BUSNAME_MAKING); | |
536 | } else { | |
8d0e0ddd | 537 | /* If there is no policy, we can do everything |
a4152e3f LP |
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) { | |
f2341e0a | 542 | log_unit_warning_errno(UNIT(n), r, "Failed to make starter: %m"); |
a4152e3f LP |
543 | goto fail; |
544 | } | |
545 | ||
546 | busname_enter_listening(n); | |
547 | } | |
548 | ||
549 | return; | |
550 | ||
e821075a LP |
551 | fail: |
552 | busname_enter_dead(n, BUSNAME_FAILURE_RESOURCES); | |
553 | } | |
554 | ||
555 | static void busname_enter_running(BusName *n) { | |
556 | _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; | |
557 | bool pending = false; | |
558 | Unit *other; | |
559 | Iterator i; | |
560 | int r; | |
561 | ||
562 | assert(n); | |
563 | ||
5892a914 DM |
564 | if (!n->activating) |
565 | return; | |
566 | ||
05a08cb6 | 567 | /* We don't take connections anymore if we are supposed to |
e821075a LP |
568 | * shut down anyway */ |
569 | ||
570 | if (unit_stop_pending(UNIT(n))) { | |
f2341e0a | 571 | log_unit_debug(UNIT(n), "Suppressing activation request since unit stop is scheduled."); |
16ac4014 LP |
572 | |
573 | /* Flush all queued activation reqeuest by closing and reopening the connection */ | |
ff975efb | 574 | bus_kernel_drop_one(n->starter_fd); |
16ac4014 | 575 | |
16ac4014 | 576 | busname_enter_listening(n); |
e821075a LP |
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) { | |
589 | r = manager_add_job(UNIT(n)->manager, JOB_START, UNIT_DEREF(n->service), JOB_REPLACE, true, &error, NULL); | |
590 | if (r < 0) | |
591 | goto fail; | |
592 | } | |
593 | ||
594 | busname_set_state(n, BUSNAME_RUNNING); | |
595 | return; | |
596 | ||
597 | fail: | |
f2341e0a | 598 | log_unit_warning(UNIT(n), "Failed to queue service startup job: %s", bus_error_message(&error, r)); |
e821075a LP |
599 | busname_enter_dead(n, BUSNAME_FAILURE_RESOURCES); |
600 | } | |
601 | ||
602 | static int busname_start(Unit *u) { | |
603 | BusName *n = BUSNAME(u); | |
604 | ||
605 | assert(n); | |
606 | ||
a4152e3f LP |
607 | /* We cannot fulfill this request right now, try again later |
608 | * please! */ | |
609 | if (IN_SET(n->state, BUSNAME_SIGTERM, BUSNAME_SIGKILL)) | |
610 | return -EAGAIN; | |
611 | ||
612 | /* Already on it! */ | |
613 | if (n->state == BUSNAME_MAKING) | |
614 | return 0; | |
615 | ||
5892a914 | 616 | if (n->activating && UNIT_ISSET(n->service)) { |
e821075a LP |
617 | Service *service; |
618 | ||
619 | service = SERVICE(UNIT_DEREF(n->service)); | |
620 | ||
621 | if (UNIT(service)->load_state != UNIT_LOADED) { | |
f2341e0a | 622 | log_unit_error(u, "Bus service %s not loaded, refusing.", UNIT(service)->id); |
e821075a LP |
623 | return -ENOENT; |
624 | } | |
625 | } | |
626 | ||
627 | assert(IN_SET(n->state, BUSNAME_DEAD, BUSNAME_FAILED)); | |
628 | ||
629 | n->result = BUSNAME_SUCCESS; | |
a4152e3f | 630 | busname_enter_making(n); |
e821075a | 631 | |
82a2b6bb | 632 | return 1; |
e821075a LP |
633 | } |
634 | ||
635 | static int busname_stop(Unit *u) { | |
636 | BusName *n = BUSNAME(u); | |
637 | ||
638 | assert(n); | |
a4152e3f LP |
639 | |
640 | /* Already on it */ | |
641 | if (IN_SET(n->state, BUSNAME_SIGTERM, BUSNAME_SIGKILL)) | |
642 | return 0; | |
643 | ||
644 | /* If there's already something running, we go directly into | |
645 | * kill mode. */ | |
646 | ||
647 | if (n->state == BUSNAME_MAKING) { | |
648 | busname_enter_signal(n, BUSNAME_SIGTERM, BUSNAME_SUCCESS); | |
649 | return -EAGAIN; | |
650 | } | |
651 | ||
5892a914 | 652 | assert(IN_SET(n->state, BUSNAME_REGISTERED, BUSNAME_LISTENING, BUSNAME_RUNNING)); |
e821075a LP |
653 | |
654 | busname_enter_dead(n, BUSNAME_SUCCESS); | |
82a2b6bb | 655 | return 1; |
e821075a LP |
656 | } |
657 | ||
658 | static int busname_serialize(Unit *u, FILE *f, FDSet *fds) { | |
659 | BusName *n = BUSNAME(u); | |
660 | ||
661 | assert(n); | |
662 | assert(f); | |
663 | assert(fds); | |
664 | ||
665 | unit_serialize_item(u, f, "state", busname_state_to_string(n->state)); | |
666 | unit_serialize_item(u, f, "result", busname_result_to_string(n->result)); | |
667 | ||
a4152e3f LP |
668 | if (n->control_pid > 0) |
669 | unit_serialize_item_format(u, f, "control-pid", PID_FMT, n->control_pid); | |
670 | ||
e821075a LP |
671 | if (n->starter_fd >= 0) { |
672 | int copy; | |
673 | ||
674 | copy = fdset_put_dup(fds, n->starter_fd); | |
675 | if (copy < 0) | |
676 | return copy; | |
677 | ||
678 | unit_serialize_item_format(u, f, "starter-fd", "%i", copy); | |
679 | } | |
680 | ||
681 | return 0; | |
682 | } | |
683 | ||
684 | static int busname_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { | |
685 | BusName *n = BUSNAME(u); | |
686 | ||
687 | assert(n); | |
688 | assert(key); | |
689 | assert(value); | |
690 | ||
691 | if (streq(key, "state")) { | |
692 | BusNameState state; | |
693 | ||
694 | state = busname_state_from_string(value); | |
695 | if (state < 0) | |
f2341e0a | 696 | log_unit_debug(u, "Failed to parse state value: %s", value); |
e821075a LP |
697 | else |
698 | n->deserialized_state = state; | |
699 | ||
700 | } else if (streq(key, "result")) { | |
701 | BusNameResult f; | |
702 | ||
703 | f = busname_result_from_string(value); | |
704 | if (f < 0) | |
f2341e0a | 705 | log_unit_debug(u, "Failed to parse result value: %s", value); |
e821075a LP |
706 | else if (f != BUSNAME_SUCCESS) |
707 | n->result = f; | |
708 | ||
a4152e3f LP |
709 | } else if (streq(key, "control-pid")) { |
710 | pid_t pid; | |
711 | ||
712 | if (parse_pid(value, &pid) < 0) | |
f2341e0a | 713 | log_unit_debug(u, "Failed to parse control-pid value: %s", value); |
a4152e3f LP |
714 | else |
715 | n->control_pid = pid; | |
e821075a LP |
716 | } else if (streq(key, "starter-fd")) { |
717 | int fd; | |
718 | ||
719 | if (safe_atoi(value, &fd) < 0 || fd < 0 || !fdset_contains(fds, fd)) | |
f2341e0a | 720 | log_unit_debug(u, "Failed to parse starter fd value: %s", value); |
e821075a | 721 | else { |
03e334a1 | 722 | safe_close(n->starter_fd); |
e821075a LP |
723 | n->starter_fd = fdset_remove(fds, fd); |
724 | } | |
725 | } else | |
f2341e0a | 726 | log_unit_debug(u, "Unknown serialization key: %s", key); |
e821075a LP |
727 | |
728 | return 0; | |
729 | } | |
730 | ||
731 | _pure_ static UnitActiveState busname_active_state(Unit *u) { | |
732 | assert(u); | |
733 | ||
734 | return state_translation_table[BUSNAME(u)->state]; | |
735 | } | |
736 | ||
737 | _pure_ static const char *busname_sub_state_to_string(Unit *u) { | |
738 | assert(u); | |
739 | ||
740 | return busname_state_to_string(BUSNAME(u)->state); | |
741 | } | |
742 | ||
bd5f920f LP |
743 | static int busname_peek_message(BusName *n) { |
744 | struct kdbus_cmd_recv cmd_recv = { | |
94e15fdc | 745 | .size = sizeof(cmd_recv), |
bd5f920f LP |
746 | .flags = KDBUS_RECV_PEEK, |
747 | }; | |
e24e415e DM |
748 | struct kdbus_cmd_free cmd_free = { |
749 | .size = sizeof(cmd_free), | |
750 | }; | |
bd5f920f LP |
751 | const char *comm = NULL; |
752 | struct kdbus_item *d; | |
753 | struct kdbus_msg *k; | |
754 | size_t start, ps, sz, delta; | |
755 | void *p = NULL; | |
756 | pid_t pid = 0; | |
757 | int r; | |
758 | ||
dcc2fc01 LP |
759 | /* Generate a friendly debug log message about which process |
760 | * caused triggering of this bus name. This simply peeks the | |
761 | * metadata of the first queued message and logs it. */ | |
762 | ||
bd5f920f LP |
763 | assert(n); |
764 | ||
dcc2fc01 LP |
765 | /* Let's shortcut things a bit, if debug logging is turned off |
766 | * anyway. */ | |
767 | ||
768 | if (log_get_max_level() < LOG_DEBUG) | |
769 | return 0; | |
bd5f920f | 770 | |
94e15fdc | 771 | r = ioctl(n->starter_fd, KDBUS_CMD_RECV, &cmd_recv); |
bd5f920f LP |
772 | if (r < 0) { |
773 | if (errno == EINTR || errno == EAGAIN) | |
774 | return 0; | |
775 | ||
f2341e0a | 776 | return log_unit_error_errno(UNIT(n), errno, "Failed to query activation message: %m"); |
bd5f920f LP |
777 | } |
778 | ||
779 | /* We map as late as possible, and unmap imemdiately after | |
780 | * use. On 32bit address space is scarce and we want to be | |
781 | * able to handle a lot of activator connections at the same | |
782 | * time, and hence shouldn't keep the mmap()s around for | |
783 | * longer than necessary. */ | |
784 | ||
785 | ps = page_size(); | |
a9c8343e DM |
786 | start = (cmd_recv.msg.offset / ps) * ps; |
787 | delta = cmd_recv.msg.offset - start; | |
788 | sz = PAGE_ALIGN(delta + cmd_recv.msg.msg_size); | |
bd5f920f LP |
789 | |
790 | p = mmap(NULL, sz, PROT_READ, MAP_SHARED, n->starter_fd, start); | |
791 | if (p == MAP_FAILED) { | |
f2341e0a | 792 | r = log_unit_error_errno(UNIT(n), errno, "Failed to map activation message: %m"); |
bd5f920f LP |
793 | goto finish; |
794 | } | |
795 | ||
796 | k = (struct kdbus_msg *) ((uint8_t *) p + delta); | |
797 | KDBUS_ITEM_FOREACH(d, k, items) { | |
798 | switch (d->type) { | |
799 | ||
800 | case KDBUS_ITEM_PIDS: | |
801 | pid = d->pids.pid; | |
802 | break; | |
803 | ||
804 | case KDBUS_ITEM_PID_COMM: | |
805 | comm = d->str; | |
806 | break; | |
807 | } | |
808 | } | |
809 | ||
810 | if (pid > 0) | |
f2341e0a | 811 | log_unit_debug(UNIT(n), "Activation triggered by process " PID_FMT " (%s)", pid, strna(comm)); |
bd5f920f LP |
812 | |
813 | r = 0; | |
814 | ||
815 | finish: | |
816 | if (p) | |
817 | (void) munmap(p, sz); | |
818 | ||
a9c8343e | 819 | cmd_free.offset = cmd_recv.msg.offset; |
dcc2fc01 | 820 | if (ioctl(n->starter_fd, KDBUS_CMD_FREE, &cmd_free) < 0) |
f2341e0a | 821 | log_unit_warning(UNIT(n), "Failed to free peeked message, ignoring: %m"); |
bd5f920f LP |
822 | |
823 | return r; | |
824 | } | |
825 | ||
e821075a LP |
826 | static int busname_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) { |
827 | BusName *n = userdata; | |
828 | ||
829 | assert(n); | |
830 | assert(fd >= 0); | |
831 | ||
832 | if (n->state != BUSNAME_LISTENING) | |
833 | return 0; | |
834 | ||
f2341e0a | 835 | log_unit_debug(UNIT(n), "Activation request"); |
e821075a LP |
836 | |
837 | if (revents != EPOLLIN) { | |
f2341e0a | 838 | log_unit_error(UNIT(n), "Got unexpected poll event (0x%x) on starter fd.", revents); |
e821075a LP |
839 | goto fail; |
840 | } | |
841 | ||
bd5f920f | 842 | busname_peek_message(n); |
e821075a LP |
843 | busname_enter_running(n); |
844 | return 0; | |
845 | fail: | |
846 | ||
847 | busname_enter_dead(n, BUSNAME_FAILURE_RESOURCES); | |
848 | return 0; | |
849 | } | |
850 | ||
a4152e3f LP |
851 | static void busname_sigchld_event(Unit *u, pid_t pid, int code, int status) { |
852 | BusName *n = BUSNAME(u); | |
853 | BusNameResult f; | |
854 | ||
855 | assert(n); | |
856 | assert(pid >= 0); | |
857 | ||
858 | if (pid != n->control_pid) | |
859 | return; | |
860 | ||
861 | n->control_pid = 0; | |
862 | ||
863 | if (is_clean_exit(code, status, NULL)) | |
864 | f = BUSNAME_SUCCESS; | |
865 | else if (code == CLD_EXITED) | |
866 | f = BUSNAME_FAILURE_EXIT_CODE; | |
867 | else if (code == CLD_KILLED) | |
868 | f = BUSNAME_FAILURE_SIGNAL; | |
deffddf1 | 869 | else if (code == CLD_DUMPED) |
a4152e3f LP |
870 | f = BUSNAME_FAILURE_CORE_DUMP; |
871 | else | |
872 | assert_not_reached("Unknown sigchld code"); | |
873 | ||
f2341e0a LP |
874 | log_unit_full(u, f == BUSNAME_SUCCESS ? LOG_DEBUG : LOG_NOTICE, 0, |
875 | "Control process exited, code=%s status=%i", sigchld_code_to_string(code), status); | |
a4152e3f LP |
876 | |
877 | if (f != BUSNAME_SUCCESS) | |
878 | n->result = f; | |
879 | ||
880 | switch (n->state) { | |
881 | ||
882 | case BUSNAME_MAKING: | |
883 | if (f == BUSNAME_SUCCESS) | |
884 | busname_enter_listening(n); | |
885 | else | |
886 | busname_enter_signal(n, BUSNAME_SIGTERM, f); | |
887 | break; | |
888 | ||
889 | case BUSNAME_SIGTERM: | |
890 | case BUSNAME_SIGKILL: | |
891 | busname_enter_dead(n, f); | |
892 | break; | |
893 | ||
894 | default: | |
895 | assert_not_reached("Uh, control process died at wrong time."); | |
896 | } | |
897 | ||
898 | /* Notify clients about changed exit status */ | |
899 | unit_add_to_dbus_queue(u); | |
900 | } | |
901 | ||
902 | static int busname_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) { | |
903 | BusName *n = BUSNAME(userdata); | |
904 | ||
905 | assert(n); | |
906 | assert(n->timer_event_source == source); | |
907 | ||
908 | switch (n->state) { | |
909 | ||
910 | case BUSNAME_MAKING: | |
f2341e0a | 911 | log_unit_warning(UNIT(n), "Making timed out. Terminating."); |
a4152e3f LP |
912 | busname_enter_signal(n, BUSNAME_SIGTERM, BUSNAME_FAILURE_TIMEOUT); |
913 | break; | |
914 | ||
915 | case BUSNAME_SIGTERM: | |
f2341e0a | 916 | log_unit_warning(UNIT(n), "Stopping timed out. Killing."); |
a4152e3f LP |
917 | busname_enter_signal(n, BUSNAME_SIGKILL, BUSNAME_FAILURE_TIMEOUT); |
918 | break; | |
919 | ||
920 | case BUSNAME_SIGKILL: | |
f2341e0a | 921 | log_unit_warning(UNIT(n), "Processes still around after SIGKILL. Ignoring."); |
a4152e3f LP |
922 | busname_enter_dead(n, BUSNAME_FAILURE_TIMEOUT); |
923 | break; | |
924 | ||
925 | default: | |
926 | assert_not_reached("Timeout at wrong time."); | |
927 | } | |
928 | ||
929 | return 0; | |
930 | } | |
931 | ||
e821075a LP |
932 | static void busname_reset_failed(Unit *u) { |
933 | BusName *n = BUSNAME(u); | |
934 | ||
935 | assert(n); | |
936 | ||
937 | if (n->state == BUSNAME_FAILED) | |
938 | busname_set_state(n, BUSNAME_DEAD); | |
939 | ||
940 | n->result = BUSNAME_SUCCESS; | |
941 | } | |
942 | ||
943 | static void busname_trigger_notify(Unit *u, Unit *other) { | |
944 | BusName *n = BUSNAME(u); | |
945 | Service *s; | |
946 | ||
947 | assert(n); | |
948 | assert(other); | |
949 | ||
950 | if (!IN_SET(n->state, BUSNAME_RUNNING, BUSNAME_LISTENING)) | |
951 | return; | |
952 | ||
953 | if (other->load_state != UNIT_LOADED || other->type != UNIT_SERVICE) | |
954 | return; | |
955 | ||
956 | s = SERVICE(other); | |
957 | ||
2f671520 LP |
958 | if (s->state == SERVICE_FAILED && s->result == SERVICE_FAILURE_START_LIMIT) |
959 | busname_enter_dead(n, BUSNAME_FAILURE_SERVICE_FAILED_PERMANENT); | |
960 | else if (IN_SET(s->state, | |
961 | SERVICE_DEAD, SERVICE_FAILED, | |
962 | SERVICE_STOP, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL, | |
963 | SERVICE_STOP_POST, SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL, | |
964 | SERVICE_AUTO_RESTART)) | |
e821075a LP |
965 | busname_enter_listening(n); |
966 | } | |
967 | ||
a4152e3f LP |
968 | static int busname_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) { |
969 | return unit_kill_common(u, who, signo, -1, BUSNAME(u)->control_pid, error); | |
970 | } | |
971 | ||
972 | static int busname_get_timeout(Unit *u, uint64_t *timeout) { | |
973 | BusName *n = BUSNAME(u); | |
974 | int r; | |
975 | ||
976 | if (!n->timer_event_source) | |
977 | return 0; | |
978 | ||
979 | r = sd_event_source_get_time(n->timer_event_source, timeout); | |
980 | if (r < 0) | |
981 | return r; | |
982 | ||
983 | return 1; | |
984 | } | |
985 | ||
1c2e9646 | 986 | static bool busname_supported(void) { |
d69a7cea | 987 | static int supported = -1; |
0faacd47 LP |
988 | |
989 | if (supported < 0) | |
d79acc30 | 990 | supported = is_kdbus_available(); |
0faacd47 LP |
991 | |
992 | return supported; | |
993 | } | |
994 | ||
e821075a LP |
995 | static const char* const busname_state_table[_BUSNAME_STATE_MAX] = { |
996 | [BUSNAME_DEAD] = "dead", | |
a4152e3f | 997 | [BUSNAME_MAKING] = "making", |
5892a914 | 998 | [BUSNAME_REGISTERED] = "registered", |
e821075a LP |
999 | [BUSNAME_LISTENING] = "listening", |
1000 | [BUSNAME_RUNNING] = "running", | |
a4152e3f LP |
1001 | [BUSNAME_SIGTERM] = "sigterm", |
1002 | [BUSNAME_SIGKILL] = "sigkill", | |
1003 | [BUSNAME_FAILED] = "failed", | |
e821075a LP |
1004 | }; |
1005 | ||
1006 | DEFINE_STRING_TABLE_LOOKUP(busname_state, BusNameState); | |
1007 | ||
1008 | static const char* const busname_result_table[_BUSNAME_RESULT_MAX] = { | |
1009 | [BUSNAME_SUCCESS] = "success", | |
1010 | [BUSNAME_FAILURE_RESOURCES] = "resources", | |
a4152e3f LP |
1011 | [BUSNAME_FAILURE_TIMEOUT] = "timeout", |
1012 | [BUSNAME_FAILURE_EXIT_CODE] = "exit-code", | |
1013 | [BUSNAME_FAILURE_SIGNAL] = "signal", | |
1014 | [BUSNAME_FAILURE_CORE_DUMP] = "core-dump", | |
700ff4d9 | 1015 | [BUSNAME_FAILURE_SERVICE_FAILED_PERMANENT] = "service-failed-permanent", |
e821075a LP |
1016 | }; |
1017 | ||
1018 | DEFINE_STRING_TABLE_LOOKUP(busname_result, BusNameResult); | |
1019 | ||
1020 | const UnitVTable busname_vtable = { | |
1021 | .object_size = sizeof(BusName), | |
1022 | ||
1023 | .sections = | |
1024 | "Unit\0" | |
1025 | "BusName\0" | |
1026 | "Install\0", | |
1027 | .private_section = "BusName", | |
1028 | ||
e05ad7bc LP |
1029 | .no_alias = true, |
1030 | .no_instances = true, | |
1031 | ||
e821075a LP |
1032 | .init = busname_init, |
1033 | .done = busname_done, | |
1034 | .load = busname_load, | |
1035 | ||
1036 | .coldplug = busname_coldplug, | |
1037 | ||
1038 | .dump = busname_dump, | |
1039 | ||
1040 | .start = busname_start, | |
1041 | .stop = busname_stop, | |
1042 | ||
a4152e3f LP |
1043 | .kill = busname_kill, |
1044 | ||
1045 | .get_timeout = busname_get_timeout, | |
1046 | ||
e821075a LP |
1047 | .serialize = busname_serialize, |
1048 | .deserialize_item = busname_deserialize_item, | |
1049 | ||
1050 | .active_state = busname_active_state, | |
1051 | .sub_state_to_string = busname_sub_state_to_string, | |
1052 | ||
a4152e3f LP |
1053 | .sigchld_event = busname_sigchld_event, |
1054 | ||
e821075a LP |
1055 | .trigger_notify = busname_trigger_notify, |
1056 | ||
1057 | .reset_failed = busname_reset_failed, | |
1058 | ||
0faacd47 LP |
1059 | .supported = busname_supported, |
1060 | ||
e821075a | 1061 | .bus_vtable = bus_busname_vtable, |
e821075a LP |
1062 | |
1063 | .status_message_formats = { | |
1064 | .finished_start_job = { | |
1065 | [JOB_DONE] = "Listening on %s.", | |
1066 | [JOB_FAILED] = "Failed to listen on %s.", | |
e821075a LP |
1067 | }, |
1068 | .finished_stop_job = { | |
1069 | [JOB_DONE] = "Closed %s.", | |
1070 | [JOB_FAILED] = "Failed stopping %s.", | |
e821075a LP |
1071 | }, |
1072 | }, | |
1073 | }; |