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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 LP |
24 | #include "special.h" |
25 | #include "bus-kernel.h" | |
26 | #include "bus-internal.h" | |
27 | #include "bus-util.h" | |
28 | #include "service.h" | |
29 | #include "dbus-busname.h" | |
30 | #include "busname.h" | |
bd5f920f | 31 | #include "kdbus.h" |
e821075a LP |
32 | |
33 | static const UnitActiveState state_translation_table[_BUSNAME_STATE_MAX] = { | |
34 | [BUSNAME_DEAD] = UNIT_INACTIVE, | |
a4152e3f | 35 | [BUSNAME_MAKING] = UNIT_ACTIVATING, |
5892a914 | 36 | [BUSNAME_REGISTERED] = UNIT_ACTIVE, |
e821075a LP |
37 | [BUSNAME_LISTENING] = UNIT_ACTIVE, |
38 | [BUSNAME_RUNNING] = UNIT_ACTIVE, | |
a4152e3f LP |
39 | [BUSNAME_SIGTERM] = UNIT_DEACTIVATING, |
40 | [BUSNAME_SIGKILL] = UNIT_DEACTIVATING, | |
e821075a LP |
41 | [BUSNAME_FAILED] = UNIT_FAILED |
42 | }; | |
43 | ||
44 | static int busname_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata); | |
a4152e3f | 45 | static int busname_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata); |
e821075a LP |
46 | |
47 | static void busname_init(Unit *u) { | |
48 | BusName *n = BUSNAME(u); | |
49 | ||
50 | assert(u); | |
51 | assert(u->load_state == UNIT_STUB); | |
52 | ||
53 | n->starter_fd = -1; | |
3f9da416 | 54 | n->accept_fd = true; |
4f101180 | 55 | n->activating = true; |
a4152e3f LP |
56 | |
57 | n->timeout_usec = u->manager->default_timeout_start_usec; | |
58 | } | |
59 | ||
60 | static void busname_unwatch_control_pid(BusName *n) { | |
61 | assert(n); | |
62 | ||
63 | if (n->control_pid <= 0) | |
64 | return; | |
65 | ||
66 | unit_unwatch_pid(UNIT(n), n->control_pid); | |
67 | n->control_pid = 0; | |
68 | } | |
69 | ||
70 | static void busname_free_policy(BusName *n) { | |
71 | BusNamePolicy *p; | |
72 | ||
73 | assert(n); | |
74 | ||
75 | while ((p = n->policy)) { | |
76 | LIST_REMOVE(policy, n->policy, p); | |
77 | ||
78 | free(p->name); | |
79 | free(p); | |
80 | } | |
81 | } | |
82 | ||
83 | static void busname_close_fd(BusName *n) { | |
84 | assert(n); | |
85 | ||
86 | n->starter_event_source = sd_event_source_unref(n->starter_event_source); | |
87 | n->starter_fd = safe_close(n->starter_fd); | |
e821075a LP |
88 | } |
89 | ||
90 | static void busname_done(Unit *u) { | |
91 | BusName *n = BUSNAME(u); | |
92 | ||
a4152e3f | 93 | assert(n); |
e821075a LP |
94 | |
95 | free(n->name); | |
96 | n->name = NULL; | |
97 | ||
a4152e3f LP |
98 | busname_free_policy(n); |
99 | busname_unwatch_control_pid(n); | |
100 | busname_close_fd(n); | |
101 | ||
e821075a LP |
102 | unit_ref_unset(&n->service); |
103 | ||
a4152e3f LP |
104 | n->timer_event_source = sd_event_source_unref(n->timer_event_source); |
105 | } | |
106 | ||
107 | static int busname_arm_timer(BusName *n) { | |
108 | int r; | |
109 | ||
110 | assert(n); | |
111 | ||
112 | if (n->timeout_usec <= 0) { | |
113 | n->timer_event_source = sd_event_source_unref(n->timer_event_source); | |
114 | return 0; | |
115 | } | |
116 | ||
117 | if (n->timer_event_source) { | |
118 | r = sd_event_source_set_time(n->timer_event_source, now(CLOCK_MONOTONIC) + n->timeout_usec); | |
119 | if (r < 0) | |
120 | return r; | |
121 | ||
122 | return sd_event_source_set_enabled(n->timer_event_source, SD_EVENT_ONESHOT); | |
123 | } | |
124 | ||
125 | return sd_event_add_time( | |
126 | UNIT(n)->manager->event, | |
127 | &n->timer_event_source, | |
128 | CLOCK_MONOTONIC, | |
129 | now(CLOCK_MONOTONIC) + n->timeout_usec, 0, | |
130 | busname_dispatch_timer, n); | |
e821075a LP |
131 | } |
132 | ||
133 | static int busname_add_default_default_dependencies(BusName *n) { | |
134 | int r; | |
135 | ||
136 | assert(n); | |
137 | ||
138 | r = unit_add_dependency_by_name(UNIT(n), UNIT_BEFORE, SPECIAL_BUSNAMES_TARGET, NULL, true); | |
139 | if (r < 0) | |
140 | return r; | |
141 | ||
142 | if (UNIT(n)->manager->running_as == SYSTEMD_SYSTEM) { | |
143 | r = unit_add_two_dependencies_by_name(UNIT(n), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SYSINIT_TARGET, NULL, true); | |
144 | if (r < 0) | |
145 | return r; | |
146 | } | |
147 | ||
148 | return unit_add_two_dependencies_by_name(UNIT(n), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, NULL, true); | |
149 | } | |
150 | ||
151 | static int busname_add_extras(BusName *n) { | |
152 | Unit *u = UNIT(n); | |
153 | int r; | |
154 | ||
155 | assert(n); | |
156 | ||
157 | if (!n->name) { | |
158 | n->name = unit_name_to_prefix(u->id); | |
159 | if (!n->name) | |
160 | return -ENOMEM; | |
161 | } | |
162 | ||
163 | if (!u->description) { | |
164 | r = unit_set_description(u, n->name); | |
165 | if (r < 0) | |
166 | return r; | |
167 | } | |
168 | ||
5892a914 DM |
169 | if (n->activating) { |
170 | if (!UNIT_DEREF(n->service)) { | |
171 | Unit *x; | |
e821075a | 172 | |
5892a914 DM |
173 | r = unit_load_related_unit(u, ".service", &x); |
174 | if (r < 0) | |
175 | return r; | |
176 | ||
177 | unit_ref_set(&n->service, x); | |
178 | } | |
179 | ||
180 | r = unit_add_two_dependencies(u, UNIT_BEFORE, UNIT_TRIGGERS, UNIT_DEREF(n->service), true); | |
e821075a LP |
181 | if (r < 0) |
182 | return r; | |
e821075a LP |
183 | } |
184 | ||
e821075a LP |
185 | if (u->default_dependencies) { |
186 | r = busname_add_default_default_dependencies(n); | |
187 | if (r < 0) | |
188 | return r; | |
189 | } | |
190 | ||
191 | return 0; | |
192 | } | |
193 | ||
e821075a LP |
194 | static int busname_verify(BusName *n) { |
195 | char *e; | |
196 | ||
197 | assert(n); | |
198 | ||
199 | if (UNIT(n)->load_state != UNIT_LOADED) | |
200 | return 0; | |
201 | ||
202 | if (!service_name_is_valid(n->name)) { | |
79008bdd | 203 | log_unit_error(UNIT(n)->id, "%s's Name= setting is not a valid service name Refusing.", UNIT(n)->id); |
e821075a LP |
204 | return -EINVAL; |
205 | } | |
206 | ||
207 | e = strappenda(n->name, ".busname"); | |
208 | if (!unit_has_name(UNIT(n), e)) { | |
79008bdd | 209 | log_unit_error(UNIT(n)->id, "%s's Name= setting doesn't match unit name. Refusing.", UNIT(n)->id); |
e821075a LP |
210 | return -EINVAL; |
211 | } | |
212 | ||
213 | return 0; | |
214 | } | |
215 | ||
216 | static int busname_load(Unit *u) { | |
217 | BusName *n = BUSNAME(u); | |
218 | int r; | |
219 | ||
220 | assert(u); | |
221 | assert(u->load_state == UNIT_STUB); | |
222 | ||
223 | r = unit_load_fragment_and_dropin(u); | |
224 | if (r < 0) | |
225 | return r; | |
226 | ||
227 | if (u->load_state == UNIT_LOADED) { | |
228 | /* This is a new unit? Then let's add in some extras */ | |
229 | r = busname_add_extras(n); | |
230 | if (r < 0) | |
231 | return r; | |
232 | } | |
233 | ||
234 | return busname_verify(n); | |
235 | } | |
236 | ||
237 | static void busname_dump(Unit *u, FILE *f, const char *prefix) { | |
238 | BusName *n = BUSNAME(u); | |
239 | ||
240 | assert(n); | |
241 | assert(f); | |
242 | ||
243 | fprintf(f, | |
244 | "%sBus Name State: %s\n" | |
245 | "%sResult: %s\n" | |
3f9da416 | 246 | "%sName: %s\n" |
5892a914 | 247 | "%sActivating: %s\n" |
3f9da416 | 248 | "%sAccept FD: %s\n", |
e821075a LP |
249 | prefix, busname_state_to_string(n->state), |
250 | prefix, busname_result_to_string(n->result), | |
3f9da416 | 251 | prefix, n->name, |
5892a914 | 252 | prefix, yes_no(n->activating), |
3f9da416 | 253 | prefix, yes_no(n->accept_fd)); |
a4152e3f LP |
254 | |
255 | if (n->control_pid > 0) | |
256 | fprintf(f, | |
257 | "%sControl PID: "PID_FMT"\n", | |
258 | prefix, n->control_pid); | |
e821075a LP |
259 | } |
260 | ||
261 | static void busname_unwatch_fd(BusName *n) { | |
262 | int r; | |
263 | ||
264 | assert(n); | |
265 | ||
a4152e3f | 266 | if (!n->starter_event_source) |
e821075a LP |
267 | return; |
268 | ||
a4152e3f LP |
269 | r = sd_event_source_set_enabled(n->starter_event_source, SD_EVENT_OFF); |
270 | if (r < 0) | |
79008bdd | 271 | log_unit_debug(UNIT(n)->id, "Failed to disable event source."); |
e821075a LP |
272 | } |
273 | ||
274 | static int busname_watch_fd(BusName *n) { | |
275 | int r; | |
276 | ||
277 | assert(n); | |
278 | ||
279 | if (n->starter_fd < 0) | |
280 | return 0; | |
281 | ||
a4152e3f LP |
282 | if (n->starter_event_source) |
283 | r = sd_event_source_set_enabled(n->starter_event_source, SD_EVENT_ON); | |
e821075a | 284 | else |
a4152e3f | 285 | r = sd_event_add_io(UNIT(n)->manager->event, &n->starter_event_source, n->starter_fd, EPOLLIN, busname_dispatch_io, n); |
e821075a | 286 | if (r < 0) { |
31938a85 | 287 | log_unit_warning_errno(UNIT(n)->id, r, "Failed to watch starter fd: %m"); |
e821075a LP |
288 | busname_unwatch_fd(n); |
289 | return r; | |
290 | } | |
291 | ||
292 | return 0; | |
293 | } | |
294 | ||
295 | static int busname_open_fd(BusName *n) { | |
8f077bf9 ZJS |
296 | _cleanup_free_ char *path = NULL; |
297 | const char *mode; | |
298 | ||
e821075a LP |
299 | assert(n); |
300 | ||
301 | if (n->starter_fd >= 0) | |
302 | return 0; | |
303 | ||
8f077bf9 ZJS |
304 | mode = UNIT(n)->manager->running_as == SYSTEMD_SYSTEM ? "system" : "user"; |
305 | n->starter_fd = bus_kernel_open_bus_fd(mode, &path); | |
23bbb0de MS |
306 | if (n->starter_fd < 0) |
307 | return log_unit_warning_errno(UNIT(n)->id, n->starter_fd, "Failed to open %s: %m", path ?: "kdbus"); | |
e821075a LP |
308 | |
309 | return 0; | |
310 | } | |
311 | ||
312 | static void busname_set_state(BusName *n, BusNameState state) { | |
313 | BusNameState old_state; | |
314 | assert(n); | |
315 | ||
316 | old_state = n->state; | |
317 | n->state = state; | |
318 | ||
a4152e3f LP |
319 | if (!IN_SET(state, BUSNAME_MAKING, BUSNAME_SIGTERM, BUSNAME_SIGKILL)) { |
320 | n->timer_event_source = sd_event_source_unref(n->timer_event_source); | |
321 | busname_unwatch_control_pid(n); | |
322 | } | |
323 | ||
e821075a LP |
324 | if (state != BUSNAME_LISTENING) |
325 | busname_unwatch_fd(n); | |
326 | ||
a4152e3f | 327 | if (!IN_SET(state, BUSNAME_LISTENING, BUSNAME_MAKING, BUSNAME_REGISTERED, BUSNAME_RUNNING)) |
e821075a LP |
328 | busname_close_fd(n); |
329 | ||
330 | if (state != old_state) | |
79008bdd | 331 | log_unit_debug(UNIT(n)->id, "%s changed %s -> %s", |
e821075a LP |
332 | UNIT(n)->id, busname_state_to_string(old_state), busname_state_to_string(state)); |
333 | ||
334 | unit_notify(UNIT(n), state_translation_table[old_state], state_translation_table[state], true); | |
335 | } | |
336 | ||
337 | static int busname_coldplug(Unit *u) { | |
338 | BusName *n = BUSNAME(u); | |
339 | int r; | |
340 | ||
341 | assert(n); | |
342 | assert(n->state == BUSNAME_DEAD); | |
343 | ||
344 | if (n->deserialized_state == n->state) | |
345 | return 0; | |
346 | ||
a4152e3f LP |
347 | if (IN_SET(n->deserialized_state, BUSNAME_MAKING, BUSNAME_SIGTERM, BUSNAME_SIGKILL)) { |
348 | ||
349 | if (n->control_pid <= 0) | |
350 | return -EBADMSG; | |
351 | ||
352 | r = unit_watch_pid(UNIT(n), n->control_pid); | |
353 | if (r < 0) | |
354 | return r; | |
355 | ||
356 | r = busname_arm_timer(n); | |
357 | if (r < 0) | |
358 | return r; | |
359 | } | |
360 | ||
361 | if (IN_SET(n->deserialized_state, BUSNAME_MAKING, BUSNAME_LISTENING, BUSNAME_REGISTERED, BUSNAME_RUNNING)) { | |
e821075a LP |
362 | r = busname_open_fd(n); |
363 | if (r < 0) | |
364 | return r; | |
365 | } | |
366 | ||
367 | if (n->deserialized_state == BUSNAME_LISTENING) { | |
368 | r = busname_watch_fd(n); | |
369 | if (r < 0) | |
370 | return r; | |
371 | } | |
372 | ||
373 | busname_set_state(n, n->deserialized_state); | |
374 | return 0; | |
375 | } | |
376 | ||
a4152e3f LP |
377 | static int busname_make_starter(BusName *n, pid_t *_pid) { |
378 | pid_t pid; | |
379 | int r; | |
380 | ||
381 | r = busname_arm_timer(n); | |
382 | if (r < 0) | |
383 | goto fail; | |
384 | ||
385 | /* We have to resolve the user/group names out-of-process, | |
386 | * hence let's fork here. It's messy, but well, what can we | |
387 | * do? */ | |
388 | ||
389 | pid = fork(); | |
390 | if (pid < 0) | |
391 | return -errno; | |
392 | ||
393 | if (pid == 0) { | |
394 | int ret; | |
395 | ||
396 | default_signals(SIGNALS_CRASH_HANDLER, SIGNALS_IGNORE, -1); | |
397 | ignore_signals(SIGPIPE, -1); | |
398 | log_forget_fds(); | |
399 | ||
400 | r = bus_kernel_make_starter(n->starter_fd, n->name, n->activating, n->accept_fd, n->policy, n->policy_world); | |
401 | if (r < 0) { | |
402 | ret = EXIT_MAKE_STARTER; | |
403 | goto fail_child; | |
404 | } | |
405 | ||
406 | _exit(0); | |
407 | ||
408 | fail_child: | |
409 | log_open(); | |
da927ba9 | 410 | log_error_errno(r, "Failed to create starter connection at step %s: %m", exit_status_to_string(ret, EXIT_STATUS_SYSTEMD)); |
a4152e3f LP |
411 | |
412 | _exit(ret); | |
413 | } | |
414 | ||
415 | r = unit_watch_pid(UNIT(n), pid); | |
416 | if (r < 0) | |
417 | goto fail; | |
418 | ||
419 | *_pid = pid; | |
420 | return 0; | |
421 | ||
422 | fail: | |
423 | n->timer_event_source = sd_event_source_unref(n->timer_event_source); | |
424 | return r; | |
425 | } | |
426 | ||
e821075a LP |
427 | static void busname_enter_dead(BusName *n, BusNameResult f) { |
428 | assert(n); | |
429 | ||
430 | if (f != BUSNAME_SUCCESS) | |
431 | n->result = f; | |
432 | ||
433 | busname_set_state(n, n->result != BUSNAME_SUCCESS ? BUSNAME_FAILED : BUSNAME_DEAD); | |
434 | } | |
435 | ||
a4152e3f LP |
436 | static void busname_enter_signal(BusName *n, BusNameState state, BusNameResult f) { |
437 | KillContext kill_context = {}; | |
e821075a LP |
438 | int r; |
439 | ||
440 | assert(n); | |
441 | ||
a4152e3f LP |
442 | if (f != BUSNAME_SUCCESS) |
443 | n->result = f; | |
444 | ||
445 | kill_context_init(&kill_context); | |
446 | ||
447 | r = unit_kill_context(UNIT(n), | |
448 | &kill_context, | |
db2cb23b | 449 | state != BUSNAME_SIGTERM ? KILL_KILL : KILL_TERMINATE, |
a4152e3f LP |
450 | -1, |
451 | n->control_pid, | |
452 | false); | |
e821075a | 453 | if (r < 0) { |
31938a85 | 454 | log_unit_warning_errno(UNIT(n)->id, r, "%s failed to kill control process: %m", UNIT(n)->id); |
e821075a LP |
455 | goto fail; |
456 | } | |
457 | ||
a4152e3f LP |
458 | if (r > 0) { |
459 | r = busname_arm_timer(n); | |
460 | if (r < 0) { | |
31938a85 | 461 | log_unit_warning_errno(UNIT(n)->id, r, "%s failed to arm timer: %m", UNIT(n)->id); |
a4152e3f LP |
462 | goto fail; |
463 | } | |
464 | ||
465 | busname_set_state(n, state); | |
466 | } else if (state == BUSNAME_SIGTERM) | |
467 | busname_enter_signal(n, BUSNAME_SIGKILL, BUSNAME_SUCCESS); | |
468 | else | |
469 | busname_enter_dead(n, BUSNAME_SUCCESS); | |
470 | ||
471 | return; | |
472 | ||
473 | fail: | |
474 | busname_enter_dead(n, BUSNAME_FAILURE_RESOURCES); | |
475 | } | |
476 | ||
477 | static void busname_enter_listening(BusName *n) { | |
478 | int r; | |
479 | ||
480 | assert(n); | |
481 | ||
5892a914 DM |
482 | if (n->activating) { |
483 | r = busname_watch_fd(n); | |
484 | if (r < 0) { | |
31938a85 | 485 | log_unit_warning_errno(UNIT(n)->id, r, "%s failed to watch names: %m", UNIT(n)->id); |
5892a914 DM |
486 | goto fail; |
487 | } | |
488 | ||
489 | busname_set_state(n, BUSNAME_LISTENING); | |
490 | } else | |
491 | busname_set_state(n, BUSNAME_REGISTERED); | |
e821075a | 492 | |
e821075a LP |
493 | return; |
494 | ||
a4152e3f LP |
495 | fail: |
496 | busname_enter_signal(n, BUSNAME_SIGTERM, BUSNAME_FAILURE_RESOURCES); | |
497 | } | |
498 | ||
499 | static void busname_enter_making(BusName *n) { | |
500 | int r; | |
501 | ||
502 | assert(n); | |
503 | ||
504 | r = busname_open_fd(n); | |
505 | if (r < 0) | |
506 | goto fail; | |
507 | ||
508 | if (n->policy) { | |
8d0e0ddd | 509 | /* If there is a policy, we need to resolve user/group |
a4152e3f LP |
510 | * names, which we can't do from PID1, hence let's |
511 | * fork. */ | |
512 | busname_unwatch_control_pid(n); | |
513 | ||
514 | r = busname_make_starter(n, &n->control_pid); | |
515 | if (r < 0) { | |
31938a85 | 516 | log_unit_warning_errno(UNIT(n)->id, r, "%s failed to fork 'making' task: %m", UNIT(n)->id); |
a4152e3f LP |
517 | goto fail; |
518 | } | |
519 | ||
520 | busname_set_state(n, BUSNAME_MAKING); | |
521 | } else { | |
8d0e0ddd | 522 | /* If there is no policy, we can do everything |
a4152e3f LP |
523 | * directly from PID 1, hence do so. */ |
524 | ||
525 | r = bus_kernel_make_starter(n->starter_fd, n->name, n->activating, n->accept_fd, NULL, n->policy_world); | |
526 | if (r < 0) { | |
31938a85 | 527 | log_unit_warning_errno(UNIT(n)->id, r, "%s failed to make starter: %m", UNIT(n)->id); |
a4152e3f LP |
528 | goto fail; |
529 | } | |
530 | ||
531 | busname_enter_listening(n); | |
532 | } | |
533 | ||
534 | return; | |
535 | ||
e821075a LP |
536 | fail: |
537 | busname_enter_dead(n, BUSNAME_FAILURE_RESOURCES); | |
538 | } | |
539 | ||
540 | static void busname_enter_running(BusName *n) { | |
541 | _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; | |
542 | bool pending = false; | |
543 | Unit *other; | |
544 | Iterator i; | |
545 | int r; | |
546 | ||
547 | assert(n); | |
548 | ||
5892a914 DM |
549 | if (!n->activating) |
550 | return; | |
551 | ||
e821075a LP |
552 | /* We don't take conenctions anymore if we are supposed to |
553 | * shut down anyway */ | |
554 | ||
555 | if (unit_stop_pending(UNIT(n))) { | |
79008bdd | 556 | log_unit_debug(UNIT(n)->id, "Suppressing activation request on %s since unit stop is scheduled.", UNIT(n)->id); |
16ac4014 LP |
557 | |
558 | /* Flush all queued activation reqeuest by closing and reopening the connection */ | |
ff975efb | 559 | bus_kernel_drop_one(n->starter_fd); |
16ac4014 | 560 | |
16ac4014 | 561 | busname_enter_listening(n); |
e821075a LP |
562 | return; |
563 | } | |
564 | ||
565 | /* If there's already a start pending don't bother to do | |
566 | * anything */ | |
567 | SET_FOREACH(other, UNIT(n)->dependencies[UNIT_TRIGGERS], i) | |
568 | if (unit_active_or_pending(other)) { | |
569 | pending = true; | |
570 | break; | |
571 | } | |
572 | ||
573 | if (!pending) { | |
574 | r = manager_add_job(UNIT(n)->manager, JOB_START, UNIT_DEREF(n->service), JOB_REPLACE, true, &error, NULL); | |
575 | if (r < 0) | |
576 | goto fail; | |
577 | } | |
578 | ||
579 | busname_set_state(n, BUSNAME_RUNNING); | |
580 | return; | |
581 | ||
582 | fail: | |
79008bdd | 583 | log_unit_warning(UNIT(n)->id, "%s failed to queue service startup job: %s", UNIT(n)->id, bus_error_message(&error, r)); |
e821075a LP |
584 | busname_enter_dead(n, BUSNAME_FAILURE_RESOURCES); |
585 | } | |
586 | ||
587 | static int busname_start(Unit *u) { | |
588 | BusName *n = BUSNAME(u); | |
589 | ||
590 | assert(n); | |
591 | ||
a4152e3f LP |
592 | /* We cannot fulfill this request right now, try again later |
593 | * please! */ | |
594 | if (IN_SET(n->state, BUSNAME_SIGTERM, BUSNAME_SIGKILL)) | |
595 | return -EAGAIN; | |
596 | ||
597 | /* Already on it! */ | |
598 | if (n->state == BUSNAME_MAKING) | |
599 | return 0; | |
600 | ||
5892a914 | 601 | if (n->activating && UNIT_ISSET(n->service)) { |
e821075a LP |
602 | Service *service; |
603 | ||
604 | service = SERVICE(UNIT_DEREF(n->service)); | |
605 | ||
606 | if (UNIT(service)->load_state != UNIT_LOADED) { | |
79008bdd | 607 | log_unit_error(u->id, "Bus service %s not loaded, refusing.", UNIT(service)->id); |
e821075a LP |
608 | return -ENOENT; |
609 | } | |
610 | } | |
611 | ||
612 | assert(IN_SET(n->state, BUSNAME_DEAD, BUSNAME_FAILED)); | |
613 | ||
614 | n->result = BUSNAME_SUCCESS; | |
a4152e3f | 615 | busname_enter_making(n); |
e821075a LP |
616 | |
617 | return 0; | |
618 | } | |
619 | ||
620 | static int busname_stop(Unit *u) { | |
621 | BusName *n = BUSNAME(u); | |
622 | ||
623 | assert(n); | |
a4152e3f LP |
624 | |
625 | /* Already on it */ | |
626 | if (IN_SET(n->state, BUSNAME_SIGTERM, BUSNAME_SIGKILL)) | |
627 | return 0; | |
628 | ||
629 | /* If there's already something running, we go directly into | |
630 | * kill mode. */ | |
631 | ||
632 | if (n->state == BUSNAME_MAKING) { | |
633 | busname_enter_signal(n, BUSNAME_SIGTERM, BUSNAME_SUCCESS); | |
634 | return -EAGAIN; | |
635 | } | |
636 | ||
5892a914 | 637 | assert(IN_SET(n->state, BUSNAME_REGISTERED, BUSNAME_LISTENING, BUSNAME_RUNNING)); |
e821075a LP |
638 | |
639 | busname_enter_dead(n, BUSNAME_SUCCESS); | |
640 | return 0; | |
641 | } | |
642 | ||
643 | static int busname_serialize(Unit *u, FILE *f, FDSet *fds) { | |
644 | BusName *n = BUSNAME(u); | |
645 | ||
646 | assert(n); | |
647 | assert(f); | |
648 | assert(fds); | |
649 | ||
650 | unit_serialize_item(u, f, "state", busname_state_to_string(n->state)); | |
651 | unit_serialize_item(u, f, "result", busname_result_to_string(n->result)); | |
652 | ||
a4152e3f LP |
653 | if (n->control_pid > 0) |
654 | unit_serialize_item_format(u, f, "control-pid", PID_FMT, n->control_pid); | |
655 | ||
e821075a LP |
656 | if (n->starter_fd >= 0) { |
657 | int copy; | |
658 | ||
659 | copy = fdset_put_dup(fds, n->starter_fd); | |
660 | if (copy < 0) | |
661 | return copy; | |
662 | ||
663 | unit_serialize_item_format(u, f, "starter-fd", "%i", copy); | |
664 | } | |
665 | ||
666 | return 0; | |
667 | } | |
668 | ||
669 | static int busname_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { | |
670 | BusName *n = BUSNAME(u); | |
671 | ||
672 | assert(n); | |
673 | assert(key); | |
674 | assert(value); | |
675 | ||
676 | if (streq(key, "state")) { | |
677 | BusNameState state; | |
678 | ||
679 | state = busname_state_from_string(value); | |
680 | if (state < 0) | |
79008bdd | 681 | log_unit_debug(u->id, "Failed to parse state value %s", value); |
e821075a LP |
682 | else |
683 | n->deserialized_state = state; | |
684 | ||
685 | } else if (streq(key, "result")) { | |
686 | BusNameResult f; | |
687 | ||
688 | f = busname_result_from_string(value); | |
689 | if (f < 0) | |
79008bdd | 690 | log_unit_debug(u->id, "Failed to parse result value %s", value); |
e821075a LP |
691 | else if (f != BUSNAME_SUCCESS) |
692 | n->result = f; | |
693 | ||
a4152e3f LP |
694 | } else if (streq(key, "control-pid")) { |
695 | pid_t pid; | |
696 | ||
697 | if (parse_pid(value, &pid) < 0) | |
79008bdd | 698 | log_unit_debug(u->id, "Failed to parse control-pid value %s", value); |
a4152e3f LP |
699 | else |
700 | n->control_pid = pid; | |
e821075a LP |
701 | } else if (streq(key, "starter-fd")) { |
702 | int fd; | |
703 | ||
704 | if (safe_atoi(value, &fd) < 0 || fd < 0 || !fdset_contains(fds, fd)) | |
79008bdd | 705 | log_unit_debug(u->id, "Failed to parse starter fd value %s", value); |
e821075a | 706 | else { |
03e334a1 | 707 | safe_close(n->starter_fd); |
e821075a LP |
708 | n->starter_fd = fdset_remove(fds, fd); |
709 | } | |
710 | } else | |
79008bdd | 711 | log_unit_debug(u->id, "Unknown serialization key '%s'", key); |
e821075a LP |
712 | |
713 | return 0; | |
714 | } | |
715 | ||
716 | _pure_ static UnitActiveState busname_active_state(Unit *u) { | |
717 | assert(u); | |
718 | ||
719 | return state_translation_table[BUSNAME(u)->state]; | |
720 | } | |
721 | ||
722 | _pure_ static const char *busname_sub_state_to_string(Unit *u) { | |
723 | assert(u); | |
724 | ||
725 | return busname_state_to_string(BUSNAME(u)->state); | |
726 | } | |
727 | ||
bd5f920f LP |
728 | static int busname_peek_message(BusName *n) { |
729 | struct kdbus_cmd_recv cmd_recv = { | |
730 | .flags = KDBUS_RECV_PEEK, | |
731 | }; | |
dcc2fc01 | 732 | struct kdbus_cmd_free cmd_free = {}; |
bd5f920f LP |
733 | const char *comm = NULL; |
734 | struct kdbus_item *d; | |
735 | struct kdbus_msg *k; | |
736 | size_t start, ps, sz, delta; | |
737 | void *p = NULL; | |
738 | pid_t pid = 0; | |
739 | int r; | |
740 | ||
dcc2fc01 LP |
741 | /* Generate a friendly debug log message about which process |
742 | * caused triggering of this bus name. This simply peeks the | |
743 | * metadata of the first queued message and logs it. */ | |
744 | ||
bd5f920f LP |
745 | assert(n); |
746 | ||
dcc2fc01 LP |
747 | /* Let's shortcut things a bit, if debug logging is turned off |
748 | * anyway. */ | |
749 | ||
750 | if (log_get_max_level() < LOG_DEBUG) | |
751 | return 0; | |
bd5f920f LP |
752 | |
753 | r = ioctl(n->starter_fd, KDBUS_CMD_MSG_RECV, &cmd_recv); | |
754 | if (r < 0) { | |
755 | if (errno == EINTR || errno == EAGAIN) | |
756 | return 0; | |
757 | ||
79008bdd | 758 | log_unit_error(UNIT(n)->id, "%s: Failed to query activation message: %m", UNIT(n)->id); |
bd5f920f LP |
759 | return -errno; |
760 | } | |
761 | ||
762 | /* We map as late as possible, and unmap imemdiately after | |
763 | * use. On 32bit address space is scarce and we want to be | |
764 | * able to handle a lot of activator connections at the same | |
765 | * time, and hence shouldn't keep the mmap()s around for | |
766 | * longer than necessary. */ | |
767 | ||
768 | ps = page_size(); | |
769 | start = (cmd_recv.offset / ps) * ps; | |
770 | delta = cmd_recv.offset - start; | |
771 | sz = PAGE_ALIGN(delta + cmd_recv.msg_size); | |
772 | ||
773 | p = mmap(NULL, sz, PROT_READ, MAP_SHARED, n->starter_fd, start); | |
774 | if (p == MAP_FAILED) { | |
79008bdd | 775 | log_unit_error(UNIT(n)->id, "%s: Failed to map activation message: %m", UNIT(n)->id); |
bd5f920f LP |
776 | r = -errno; |
777 | goto finish; | |
778 | } | |
779 | ||
780 | k = (struct kdbus_msg *) ((uint8_t *) p + delta); | |
781 | KDBUS_ITEM_FOREACH(d, k, items) { | |
782 | switch (d->type) { | |
783 | ||
784 | case KDBUS_ITEM_PIDS: | |
785 | pid = d->pids.pid; | |
786 | break; | |
787 | ||
788 | case KDBUS_ITEM_PID_COMM: | |
789 | comm = d->str; | |
790 | break; | |
791 | } | |
792 | } | |
793 | ||
794 | if (pid > 0) | |
79008bdd | 795 | log_unit_debug(UNIT(n)->id, "%s: Activation triggered by process " PID_FMT " (%s)", UNIT(n)->id, pid, strna(comm)); |
bd5f920f LP |
796 | |
797 | r = 0; | |
798 | ||
799 | finish: | |
800 | if (p) | |
801 | (void) munmap(p, sz); | |
802 | ||
dcc2fc01 LP |
803 | cmd_free.offset = cmd_recv.offset; |
804 | if (ioctl(n->starter_fd, KDBUS_CMD_FREE, &cmd_free) < 0) | |
79008bdd | 805 | log_unit_warning(UNIT(n)->id, "Failed to free peeked message, ignoring: %m"); |
bd5f920f LP |
806 | |
807 | return r; | |
808 | } | |
809 | ||
e821075a LP |
810 | static int busname_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) { |
811 | BusName *n = userdata; | |
812 | ||
813 | assert(n); | |
814 | assert(fd >= 0); | |
815 | ||
816 | if (n->state != BUSNAME_LISTENING) | |
817 | return 0; | |
818 | ||
79008bdd | 819 | log_unit_debug(UNIT(n)->id, "Activation request on %s", UNIT(n)->id); |
e821075a LP |
820 | |
821 | if (revents != EPOLLIN) { | |
79008bdd | 822 | log_unit_error(UNIT(n)->id, "%s: Got unexpected poll event (0x%x) on starter fd.", |
e821075a LP |
823 | UNIT(n)->id, revents); |
824 | goto fail; | |
825 | } | |
826 | ||
bd5f920f | 827 | busname_peek_message(n); |
e821075a LP |
828 | busname_enter_running(n); |
829 | return 0; | |
830 | fail: | |
831 | ||
832 | busname_enter_dead(n, BUSNAME_FAILURE_RESOURCES); | |
833 | return 0; | |
834 | } | |
835 | ||
a4152e3f LP |
836 | static void busname_sigchld_event(Unit *u, pid_t pid, int code, int status) { |
837 | BusName *n = BUSNAME(u); | |
838 | BusNameResult f; | |
839 | ||
840 | assert(n); | |
841 | assert(pid >= 0); | |
842 | ||
843 | if (pid != n->control_pid) | |
844 | return; | |
845 | ||
846 | n->control_pid = 0; | |
847 | ||
848 | if (is_clean_exit(code, status, NULL)) | |
849 | f = BUSNAME_SUCCESS; | |
850 | else if (code == CLD_EXITED) | |
851 | f = BUSNAME_FAILURE_EXIT_CODE; | |
852 | else if (code == CLD_KILLED) | |
853 | f = BUSNAME_FAILURE_SIGNAL; | |
deffddf1 | 854 | else if (code == CLD_DUMPED) |
a4152e3f LP |
855 | f = BUSNAME_FAILURE_CORE_DUMP; |
856 | else | |
857 | assert_not_reached("Unknown sigchld code"); | |
858 | ||
79008bdd LP |
859 | log_unit_full(u->id, |
860 | f == BUSNAME_SUCCESS ? LOG_DEBUG : LOG_NOTICE, | |
861 | "%s control process exited, code=%s status=%i", | |
a4152e3f LP |
862 | u->id, sigchld_code_to_string(code), status); |
863 | ||
864 | if (f != BUSNAME_SUCCESS) | |
865 | n->result = f; | |
866 | ||
867 | switch (n->state) { | |
868 | ||
869 | case BUSNAME_MAKING: | |
870 | if (f == BUSNAME_SUCCESS) | |
871 | busname_enter_listening(n); | |
872 | else | |
873 | busname_enter_signal(n, BUSNAME_SIGTERM, f); | |
874 | break; | |
875 | ||
876 | case BUSNAME_SIGTERM: | |
877 | case BUSNAME_SIGKILL: | |
878 | busname_enter_dead(n, f); | |
879 | break; | |
880 | ||
881 | default: | |
882 | assert_not_reached("Uh, control process died at wrong time."); | |
883 | } | |
884 | ||
885 | /* Notify clients about changed exit status */ | |
886 | unit_add_to_dbus_queue(u); | |
887 | } | |
888 | ||
889 | static int busname_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) { | |
890 | BusName *n = BUSNAME(userdata); | |
891 | ||
892 | assert(n); | |
893 | assert(n->timer_event_source == source); | |
894 | ||
895 | switch (n->state) { | |
896 | ||
897 | case BUSNAME_MAKING: | |
79008bdd | 898 | log_unit_warning(UNIT(n)->id, "%s making timed out. Terminating.", UNIT(n)->id); |
a4152e3f LP |
899 | busname_enter_signal(n, BUSNAME_SIGTERM, BUSNAME_FAILURE_TIMEOUT); |
900 | break; | |
901 | ||
902 | case BUSNAME_SIGTERM: | |
79008bdd | 903 | log_unit_warning(UNIT(n)->id, "%s stopping timed out. Killing.", UNIT(n)->id); |
a4152e3f LP |
904 | busname_enter_signal(n, BUSNAME_SIGKILL, BUSNAME_FAILURE_TIMEOUT); |
905 | break; | |
906 | ||
907 | case BUSNAME_SIGKILL: | |
79008bdd | 908 | log_unit_warning(UNIT(n)->id, "%s still around after SIGKILL. Ignoring.", UNIT(n)->id); |
a4152e3f LP |
909 | busname_enter_dead(n, BUSNAME_FAILURE_TIMEOUT); |
910 | break; | |
911 | ||
912 | default: | |
913 | assert_not_reached("Timeout at wrong time."); | |
914 | } | |
915 | ||
916 | return 0; | |
917 | } | |
918 | ||
e821075a LP |
919 | static void busname_reset_failed(Unit *u) { |
920 | BusName *n = BUSNAME(u); | |
921 | ||
922 | assert(n); | |
923 | ||
924 | if (n->state == BUSNAME_FAILED) | |
925 | busname_set_state(n, BUSNAME_DEAD); | |
926 | ||
927 | n->result = BUSNAME_SUCCESS; | |
928 | } | |
929 | ||
930 | static void busname_trigger_notify(Unit *u, Unit *other) { | |
931 | BusName *n = BUSNAME(u); | |
932 | Service *s; | |
933 | ||
934 | assert(n); | |
935 | assert(other); | |
936 | ||
937 | if (!IN_SET(n->state, BUSNAME_RUNNING, BUSNAME_LISTENING)) | |
938 | return; | |
939 | ||
940 | if (other->load_state != UNIT_LOADED || other->type != UNIT_SERVICE) | |
941 | return; | |
942 | ||
943 | s = SERVICE(other); | |
944 | ||
2f671520 LP |
945 | if (s->state == SERVICE_FAILED && s->result == SERVICE_FAILURE_START_LIMIT) |
946 | busname_enter_dead(n, BUSNAME_FAILURE_SERVICE_FAILED_PERMANENT); | |
947 | else if (IN_SET(s->state, | |
948 | SERVICE_DEAD, SERVICE_FAILED, | |
949 | SERVICE_STOP, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL, | |
950 | SERVICE_STOP_POST, SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL, | |
951 | SERVICE_AUTO_RESTART)) | |
e821075a LP |
952 | busname_enter_listening(n); |
953 | } | |
954 | ||
a4152e3f LP |
955 | static int busname_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) { |
956 | return unit_kill_common(u, who, signo, -1, BUSNAME(u)->control_pid, error); | |
957 | } | |
958 | ||
959 | static int busname_get_timeout(Unit *u, uint64_t *timeout) { | |
960 | BusName *n = BUSNAME(u); | |
961 | int r; | |
962 | ||
963 | if (!n->timer_event_source) | |
964 | return 0; | |
965 | ||
966 | r = sd_event_source_get_time(n->timer_event_source, timeout); | |
967 | if (r < 0) | |
968 | return r; | |
969 | ||
970 | return 1; | |
971 | } | |
972 | ||
e821075a LP |
973 | static const char* const busname_state_table[_BUSNAME_STATE_MAX] = { |
974 | [BUSNAME_DEAD] = "dead", | |
a4152e3f | 975 | [BUSNAME_MAKING] = "making", |
5892a914 | 976 | [BUSNAME_REGISTERED] = "registered", |
e821075a LP |
977 | [BUSNAME_LISTENING] = "listening", |
978 | [BUSNAME_RUNNING] = "running", | |
a4152e3f LP |
979 | [BUSNAME_SIGTERM] = "sigterm", |
980 | [BUSNAME_SIGKILL] = "sigkill", | |
981 | [BUSNAME_FAILED] = "failed", | |
e821075a LP |
982 | }; |
983 | ||
984 | DEFINE_STRING_TABLE_LOOKUP(busname_state, BusNameState); | |
985 | ||
986 | static const char* const busname_result_table[_BUSNAME_RESULT_MAX] = { | |
987 | [BUSNAME_SUCCESS] = "success", | |
988 | [BUSNAME_FAILURE_RESOURCES] = "resources", | |
a4152e3f LP |
989 | [BUSNAME_FAILURE_TIMEOUT] = "timeout", |
990 | [BUSNAME_FAILURE_EXIT_CODE] = "exit-code", | |
991 | [BUSNAME_FAILURE_SIGNAL] = "signal", | |
992 | [BUSNAME_FAILURE_CORE_DUMP] = "core-dump", | |
700ff4d9 | 993 | [BUSNAME_FAILURE_SERVICE_FAILED_PERMANENT] = "service-failed-permanent", |
e821075a LP |
994 | }; |
995 | ||
996 | DEFINE_STRING_TABLE_LOOKUP(busname_result, BusNameResult); | |
997 | ||
998 | const UnitVTable busname_vtable = { | |
999 | .object_size = sizeof(BusName), | |
1000 | ||
1001 | .sections = | |
1002 | "Unit\0" | |
1003 | "BusName\0" | |
1004 | "Install\0", | |
1005 | .private_section = "BusName", | |
1006 | ||
1007 | .init = busname_init, | |
1008 | .done = busname_done, | |
1009 | .load = busname_load, | |
1010 | ||
1011 | .coldplug = busname_coldplug, | |
1012 | ||
1013 | .dump = busname_dump, | |
1014 | ||
1015 | .start = busname_start, | |
1016 | .stop = busname_stop, | |
1017 | ||
a4152e3f LP |
1018 | .kill = busname_kill, |
1019 | ||
1020 | .get_timeout = busname_get_timeout, | |
1021 | ||
e821075a LP |
1022 | .serialize = busname_serialize, |
1023 | .deserialize_item = busname_deserialize_item, | |
1024 | ||
1025 | .active_state = busname_active_state, | |
1026 | .sub_state_to_string = busname_sub_state_to_string, | |
1027 | ||
a4152e3f LP |
1028 | .sigchld_event = busname_sigchld_event, |
1029 | ||
e821075a LP |
1030 | .trigger_notify = busname_trigger_notify, |
1031 | ||
1032 | .reset_failed = busname_reset_failed, | |
1033 | ||
1034 | .bus_interface = "org.freedesktop.systemd1.BusName", | |
1035 | .bus_vtable = bus_busname_vtable, | |
e821075a LP |
1036 | |
1037 | .status_message_formats = { | |
1038 | .finished_start_job = { | |
1039 | [JOB_DONE] = "Listening on %s.", | |
1040 | [JOB_FAILED] = "Failed to listen on %s.", | |
1041 | [JOB_DEPENDENCY] = "Dependency failed for %s.", | |
1042 | [JOB_TIMEOUT] = "Timed out starting %s.", | |
1043 | }, | |
1044 | .finished_stop_job = { | |
1045 | [JOB_DONE] = "Closed %s.", | |
1046 | [JOB_FAILED] = "Failed stopping %s.", | |
1047 | [JOB_TIMEOUT] = "Timed out stopping %s.", | |
1048 | }, | |
1049 | }, | |
1050 | }; |