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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 "bus-internal.h" |
07630cea LP |
25 | #include "bus-kernel.h" |
26 | #include "bus-policy.h" | |
e821075a | 27 | #include "bus-util.h" |
07630cea LP |
28 | #include "dbus-busname.h" |
29 | #include "formats-util.h" | |
3c70e3bb | 30 | #include "kdbus.h" |
24882e06 | 31 | #include "service.h" |
07630cea LP |
32 | #include "signal-util.h" |
33 | #include "special.h" | |
34 | #include "string-util.h" | |
e821075a LP |
35 | #include "busname.h" |
36 | ||
37 | static const UnitActiveState state_translation_table[_BUSNAME_STATE_MAX] = { | |
38 | [BUSNAME_DEAD] = UNIT_INACTIVE, | |
a4152e3f | 39 | [BUSNAME_MAKING] = UNIT_ACTIVATING, |
5892a914 | 40 | [BUSNAME_REGISTERED] = UNIT_ACTIVE, |
e821075a LP |
41 | [BUSNAME_LISTENING] = UNIT_ACTIVE, |
42 | [BUSNAME_RUNNING] = UNIT_ACTIVE, | |
a4152e3f LP |
43 | [BUSNAME_SIGTERM] = UNIT_DEACTIVATING, |
44 | [BUSNAME_SIGKILL] = UNIT_DEACTIVATING, | |
e821075a LP |
45 | [BUSNAME_FAILED] = UNIT_FAILED |
46 | }; | |
47 | ||
48 | static int busname_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata); | |
a4152e3f | 49 | static int busname_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata); |
e821075a LP |
50 | |
51 | static void busname_init(Unit *u) { | |
52 | BusName *n = BUSNAME(u); | |
53 | ||
54 | assert(u); | |
55 | assert(u->load_state == UNIT_STUB); | |
56 | ||
57 | n->starter_fd = -1; | |
3f9da416 | 58 | n->accept_fd = true; |
4f101180 | 59 | n->activating = true; |
a4152e3f LP |
60 | |
61 | n->timeout_usec = u->manager->default_timeout_start_usec; | |
62 | } | |
63 | ||
64 | static void busname_unwatch_control_pid(BusName *n) { | |
65 | assert(n); | |
66 | ||
67 | if (n->control_pid <= 0) | |
68 | return; | |
69 | ||
70 | unit_unwatch_pid(UNIT(n), n->control_pid); | |
71 | n->control_pid = 0; | |
72 | } | |
73 | ||
74 | static void busname_free_policy(BusName *n) { | |
75 | BusNamePolicy *p; | |
76 | ||
77 | assert(n); | |
78 | ||
79 | while ((p = n->policy)) { | |
80 | LIST_REMOVE(policy, n->policy, p); | |
81 | ||
82 | free(p->name); | |
83 | free(p); | |
84 | } | |
85 | } | |
86 | ||
87 | static void busname_close_fd(BusName *n) { | |
88 | assert(n); | |
89 | ||
90 | n->starter_event_source = sd_event_source_unref(n->starter_event_source); | |
91 | n->starter_fd = safe_close(n->starter_fd); | |
e821075a LP |
92 | } |
93 | ||
94 | static void busname_done(Unit *u) { | |
95 | BusName *n = BUSNAME(u); | |
96 | ||
a4152e3f | 97 | assert(n); |
e821075a | 98 | |
a1e58e8e | 99 | n->name = mfree(n->name); |
e821075a | 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) { | |
995c5e96 LP |
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 | ||
e821075a LP |
595 | r = manager_add_job(UNIT(n)->manager, JOB_START, UNIT_DEREF(n->service), JOB_REPLACE, true, &error, NULL); |
596 | if (r < 0) | |
597 | goto fail; | |
598 | } | |
599 | ||
600 | busname_set_state(n, BUSNAME_RUNNING); | |
601 | return; | |
602 | ||
603 | fail: | |
f2341e0a | 604 | log_unit_warning(UNIT(n), "Failed to queue service startup job: %s", bus_error_message(&error, r)); |
e821075a LP |
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 | ||
a4152e3f LP |
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 | ||
5892a914 | 622 | if (n->activating && UNIT_ISSET(n->service)) { |
e821075a LP |
623 | Service *service; |
624 | ||
625 | service = SERVICE(UNIT_DEREF(n->service)); | |
626 | ||
627 | if (UNIT(service)->load_state != UNIT_LOADED) { | |
f2341e0a | 628 | log_unit_error(u, "Bus service %s not loaded, refusing.", UNIT(service)->id); |
e821075a LP |
629 | return -ENOENT; |
630 | } | |
631 | } | |
632 | ||
633 | assert(IN_SET(n->state, BUSNAME_DEAD, BUSNAME_FAILED)); | |
634 | ||
635 | n->result = BUSNAME_SUCCESS; | |
a4152e3f | 636 | busname_enter_making(n); |
e821075a | 637 | |
82a2b6bb | 638 | return 1; |
e821075a LP |
639 | } |
640 | ||
641 | static int busname_stop(Unit *u) { | |
642 | BusName *n = BUSNAME(u); | |
643 | ||
644 | assert(n); | |
a4152e3f LP |
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 | ||
5892a914 | 658 | assert(IN_SET(n->state, BUSNAME_REGISTERED, BUSNAME_LISTENING, BUSNAME_RUNNING)); |
e821075a LP |
659 | |
660 | busname_enter_dead(n, BUSNAME_SUCCESS); | |
82a2b6bb | 661 | return 1; |
e821075a LP |
662 | } |
663 | ||
664 | static int busname_serialize(Unit *u, FILE *f, FDSet *fds) { | |
665 | BusName *n = BUSNAME(u); | |
a34ceba6 | 666 | int r; |
e821075a LP |
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 | ||
a4152e3f LP |
675 | if (n->control_pid > 0) |
676 | unit_serialize_item_format(u, f, "control-pid", PID_FMT, n->control_pid); | |
677 | ||
a34ceba6 LP |
678 | r = unit_serialize_item_fd(u, f, fds, "starter-fd", n->starter_fd); |
679 | if (r < 0) | |
680 | return r; | |
e821075a LP |
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) | |
f2341e0a | 697 | log_unit_debug(u, "Failed to parse state value: %s", value); |
e821075a LP |
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) | |
f2341e0a | 706 | log_unit_debug(u, "Failed to parse result value: %s", value); |
e821075a LP |
707 | else if (f != BUSNAME_SUCCESS) |
708 | n->result = f; | |
709 | ||
a4152e3f LP |
710 | } else if (streq(key, "control-pid")) { |
711 | pid_t pid; | |
712 | ||
713 | if (parse_pid(value, &pid) < 0) | |
f2341e0a | 714 | log_unit_debug(u, "Failed to parse control-pid value: %s", value); |
a4152e3f LP |
715 | else |
716 | n->control_pid = pid; | |
e821075a LP |
717 | } else if (streq(key, "starter-fd")) { |
718 | int fd; | |
719 | ||
720 | if (safe_atoi(value, &fd) < 0 || fd < 0 || !fdset_contains(fds, fd)) | |
f2341e0a | 721 | log_unit_debug(u, "Failed to parse starter fd value: %s", value); |
e821075a | 722 | else { |
03e334a1 | 723 | safe_close(n->starter_fd); |
e821075a LP |
724 | n->starter_fd = fdset_remove(fds, fd); |
725 | } | |
726 | } else | |
f2341e0a | 727 | log_unit_debug(u, "Unknown serialization key: %s", key); |
e821075a LP |
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 | ||
bd5f920f LP |
744 | static int busname_peek_message(BusName *n) { |
745 | struct kdbus_cmd_recv cmd_recv = { | |
94e15fdc | 746 | .size = sizeof(cmd_recv), |
bd5f920f LP |
747 | .flags = KDBUS_RECV_PEEK, |
748 | }; | |
e24e415e DM |
749 | struct kdbus_cmd_free cmd_free = { |
750 | .size = sizeof(cmd_free), | |
751 | }; | |
bd5f920f LP |
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 | ||
dcc2fc01 LP |
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 | ||
bd5f920f LP |
764 | assert(n); |
765 | ||
dcc2fc01 LP |
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; | |
bd5f920f | 771 | |
94e15fdc | 772 | r = ioctl(n->starter_fd, KDBUS_CMD_RECV, &cmd_recv); |
bd5f920f LP |
773 | if (r < 0) { |
774 | if (errno == EINTR || errno == EAGAIN) | |
775 | return 0; | |
776 | ||
f2341e0a | 777 | return log_unit_error_errno(UNIT(n), errno, "Failed to query activation message: %m"); |
bd5f920f LP |
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(); | |
a9c8343e DM |
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); | |
bd5f920f LP |
790 | |
791 | p = mmap(NULL, sz, PROT_READ, MAP_SHARED, n->starter_fd, start); | |
792 | if (p == MAP_FAILED) { | |
f2341e0a | 793 | r = log_unit_error_errno(UNIT(n), errno, "Failed to map activation message: %m"); |
bd5f920f LP |
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) | |
f2341e0a | 812 | log_unit_debug(UNIT(n), "Activation triggered by process " PID_FMT " (%s)", pid, strna(comm)); |
bd5f920f LP |
813 | |
814 | r = 0; | |
815 | ||
816 | finish: | |
817 | if (p) | |
818 | (void) munmap(p, sz); | |
819 | ||
a9c8343e | 820 | cmd_free.offset = cmd_recv.msg.offset; |
dcc2fc01 | 821 | if (ioctl(n->starter_fd, KDBUS_CMD_FREE, &cmd_free) < 0) |
f2341e0a | 822 | log_unit_warning(UNIT(n), "Failed to free peeked message, ignoring: %m"); |
bd5f920f LP |
823 | |
824 | return r; | |
825 | } | |
826 | ||
e821075a LP |
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 | ||
f2341e0a | 836 | log_unit_debug(UNIT(n), "Activation request"); |
e821075a LP |
837 | |
838 | if (revents != EPOLLIN) { | |
f2341e0a | 839 | log_unit_error(UNIT(n), "Got unexpected poll event (0x%x) on starter fd.", revents); |
e821075a LP |
840 | goto fail; |
841 | } | |
842 | ||
bd5f920f | 843 | busname_peek_message(n); |
e821075a LP |
844 | busname_enter_running(n); |
845 | return 0; | |
846 | fail: | |
847 | ||
848 | busname_enter_dead(n, BUSNAME_FAILURE_RESOURCES); | |
849 | return 0; | |
850 | } | |
851 | ||
a4152e3f LP |
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; | |
deffddf1 | 870 | else if (code == CLD_DUMPED) |
a4152e3f LP |
871 | f = BUSNAME_FAILURE_CORE_DUMP; |
872 | else | |
873 | assert_not_reached("Unknown sigchld code"); | |
874 | ||
f2341e0a LP |
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); | |
a4152e3f LP |
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: | |
f2341e0a | 912 | log_unit_warning(UNIT(n), "Making timed out. Terminating."); |
a4152e3f LP |
913 | busname_enter_signal(n, BUSNAME_SIGTERM, BUSNAME_FAILURE_TIMEOUT); |
914 | break; | |
915 | ||
916 | case BUSNAME_SIGTERM: | |
f2341e0a | 917 | log_unit_warning(UNIT(n), "Stopping timed out. Killing."); |
a4152e3f LP |
918 | busname_enter_signal(n, BUSNAME_SIGKILL, BUSNAME_FAILURE_TIMEOUT); |
919 | break; | |
920 | ||
921 | case BUSNAME_SIGKILL: | |
f2341e0a | 922 | log_unit_warning(UNIT(n), "Processes still around after SIGKILL. Ignoring."); |
a4152e3f LP |
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 | ||
e821075a LP |
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); | |
946 | Service *s; | |
947 | ||
948 | assert(n); | |
949 | assert(other); | |
950 | ||
951 | if (!IN_SET(n->state, BUSNAME_RUNNING, BUSNAME_LISTENING)) | |
952 | return; | |
953 | ||
954 | if (other->load_state != UNIT_LOADED || other->type != UNIT_SERVICE) | |
955 | return; | |
956 | ||
957 | s = SERVICE(other); | |
958 | ||
2f671520 LP |
959 | if (s->state == SERVICE_FAILED && s->result == SERVICE_FAILURE_START_LIMIT) |
960 | busname_enter_dead(n, BUSNAME_FAILURE_SERVICE_FAILED_PERMANENT); | |
961 | else if (IN_SET(s->state, | |
962 | SERVICE_DEAD, SERVICE_FAILED, | |
963 | SERVICE_STOP, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL, | |
964 | SERVICE_STOP_POST, SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL, | |
965 | SERVICE_AUTO_RESTART)) | |
e821075a LP |
966 | busname_enter_listening(n); |
967 | } | |
968 | ||
a4152e3f LP |
969 | static int busname_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) { |
970 | return unit_kill_common(u, who, signo, -1, BUSNAME(u)->control_pid, error); | |
971 | } | |
972 | ||
973 | static int busname_get_timeout(Unit *u, uint64_t *timeout) { | |
974 | BusName *n = BUSNAME(u); | |
975 | int r; | |
976 | ||
977 | if (!n->timer_event_source) | |
978 | return 0; | |
979 | ||
980 | r = sd_event_source_get_time(n->timer_event_source, timeout); | |
981 | if (r < 0) | |
982 | return r; | |
983 | ||
984 | return 1; | |
985 | } | |
986 | ||
1c2e9646 | 987 | static bool busname_supported(void) { |
d69a7cea | 988 | static int supported = -1; |
0faacd47 LP |
989 | |
990 | if (supported < 0) | |
d79acc30 | 991 | supported = is_kdbus_available(); |
0faacd47 LP |
992 | |
993 | return supported; | |
994 | } | |
995 | ||
e821075a LP |
996 | static const char* const busname_result_table[_BUSNAME_RESULT_MAX] = { |
997 | [BUSNAME_SUCCESS] = "success", | |
998 | [BUSNAME_FAILURE_RESOURCES] = "resources", | |
a4152e3f LP |
999 | [BUSNAME_FAILURE_TIMEOUT] = "timeout", |
1000 | [BUSNAME_FAILURE_EXIT_CODE] = "exit-code", | |
1001 | [BUSNAME_FAILURE_SIGNAL] = "signal", | |
1002 | [BUSNAME_FAILURE_CORE_DUMP] = "core-dump", | |
700ff4d9 | 1003 | [BUSNAME_FAILURE_SERVICE_FAILED_PERMANENT] = "service-failed-permanent", |
e821075a LP |
1004 | }; |
1005 | ||
1006 | DEFINE_STRING_TABLE_LOOKUP(busname_result, BusNameResult); | |
1007 | ||
1008 | const UnitVTable busname_vtable = { | |
1009 | .object_size = sizeof(BusName), | |
1010 | ||
1011 | .sections = | |
1012 | "Unit\0" | |
1013 | "BusName\0" | |
1014 | "Install\0", | |
1015 | .private_section = "BusName", | |
1016 | ||
e05ad7bc LP |
1017 | .no_alias = true, |
1018 | .no_instances = true, | |
1019 | ||
e821075a LP |
1020 | .init = busname_init, |
1021 | .done = busname_done, | |
1022 | .load = busname_load, | |
1023 | ||
1024 | .coldplug = busname_coldplug, | |
1025 | ||
1026 | .dump = busname_dump, | |
1027 | ||
1028 | .start = busname_start, | |
1029 | .stop = busname_stop, | |
1030 | ||
a4152e3f LP |
1031 | .kill = busname_kill, |
1032 | ||
1033 | .get_timeout = busname_get_timeout, | |
1034 | ||
e821075a LP |
1035 | .serialize = busname_serialize, |
1036 | .deserialize_item = busname_deserialize_item, | |
1037 | ||
1038 | .active_state = busname_active_state, | |
1039 | .sub_state_to_string = busname_sub_state_to_string, | |
1040 | ||
a4152e3f LP |
1041 | .sigchld_event = busname_sigchld_event, |
1042 | ||
e821075a LP |
1043 | .trigger_notify = busname_trigger_notify, |
1044 | ||
1045 | .reset_failed = busname_reset_failed, | |
1046 | ||
0faacd47 LP |
1047 | .supported = busname_supported, |
1048 | ||
e821075a | 1049 | .bus_vtable = bus_busname_vtable, |
e821075a LP |
1050 | |
1051 | .status_message_formats = { | |
1052 | .finished_start_job = { | |
1053 | [JOB_DONE] = "Listening on %s.", | |
1054 | [JOB_FAILED] = "Failed to listen on %s.", | |
e821075a LP |
1055 | }, |
1056 | .finished_stop_job = { | |
1057 | [JOB_DONE] = "Closed %s.", | |
1058 | [JOB_FAILED] = "Failed stopping %s.", | |
e821075a LP |
1059 | }, |
1060 | }, | |
1061 | }; |