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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" | |
3c70e3bb LP |
29 | #include "kdbus.h" |
30 | #include "bus-policy.h" | |
e821075a LP |
31 | #include "dbus-busname.h" |
32 | #include "busname.h" | |
6482f626 | 33 | #include "formats-util.h" |
e821075a LP |
34 | |
35 | static const UnitActiveState state_translation_table[_BUSNAME_STATE_MAX] = { | |
36 | [BUSNAME_DEAD] = UNIT_INACTIVE, | |
a4152e3f | 37 | [BUSNAME_MAKING] = UNIT_ACTIVATING, |
5892a914 | 38 | [BUSNAME_REGISTERED] = UNIT_ACTIVE, |
e821075a LP |
39 | [BUSNAME_LISTENING] = UNIT_ACTIVE, |
40 | [BUSNAME_RUNNING] = UNIT_ACTIVE, | |
a4152e3f LP |
41 | [BUSNAME_SIGTERM] = UNIT_DEACTIVATING, |
42 | [BUSNAME_SIGKILL] = UNIT_DEACTIVATING, | |
e821075a LP |
43 | [BUSNAME_FAILED] = UNIT_FAILED |
44 | }; | |
45 | ||
46 | static int busname_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata); | |
a4152e3f | 47 | static int busname_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata); |
e821075a LP |
48 | |
49 | static void busname_init(Unit *u) { | |
50 | BusName *n = BUSNAME(u); | |
51 | ||
52 | assert(u); | |
53 | assert(u->load_state == UNIT_STUB); | |
54 | ||
55 | n->starter_fd = -1; | |
3f9da416 | 56 | n->accept_fd = true; |
4f101180 | 57 | n->activating = true; |
a4152e3f LP |
58 | |
59 | n->timeout_usec = u->manager->default_timeout_start_usec; | |
60 | } | |
61 | ||
62 | static void busname_unwatch_control_pid(BusName *n) { | |
63 | assert(n); | |
64 | ||
65 | if (n->control_pid <= 0) | |
66 | return; | |
67 | ||
68 | unit_unwatch_pid(UNIT(n), n->control_pid); | |
69 | n->control_pid = 0; | |
70 | } | |
71 | ||
72 | static void busname_free_policy(BusName *n) { | |
73 | BusNamePolicy *p; | |
74 | ||
75 | assert(n); | |
76 | ||
77 | while ((p = n->policy)) { | |
78 | LIST_REMOVE(policy, n->policy, p); | |
79 | ||
80 | free(p->name); | |
81 | free(p); | |
82 | } | |
83 | } | |
84 | ||
85 | static void busname_close_fd(BusName *n) { | |
86 | assert(n); | |
87 | ||
88 | n->starter_event_source = sd_event_source_unref(n->starter_event_source); | |
89 | n->starter_fd = safe_close(n->starter_fd); | |
e821075a LP |
90 | } |
91 | ||
92 | static void busname_done(Unit *u) { | |
93 | BusName *n = BUSNAME(u); | |
94 | ||
a4152e3f | 95 | assert(n); |
e821075a LP |
96 | |
97 | free(n->name); | |
98 | n->name = NULL; | |
99 | ||
a4152e3f LP |
100 | busname_free_policy(n); |
101 | busname_unwatch_control_pid(n); | |
102 | busname_close_fd(n); | |
103 | ||
e821075a LP |
104 | unit_ref_unset(&n->service); |
105 | ||
a4152e3f LP |
106 | n->timer_event_source = sd_event_source_unref(n->timer_event_source); |
107 | } | |
108 | ||
109 | static int busname_arm_timer(BusName *n) { | |
110 | int r; | |
111 | ||
112 | assert(n); | |
113 | ||
114 | if (n->timeout_usec <= 0) { | |
115 | n->timer_event_source = sd_event_source_unref(n->timer_event_source); | |
116 | return 0; | |
117 | } | |
118 | ||
119 | if (n->timer_event_source) { | |
120 | r = sd_event_source_set_time(n->timer_event_source, now(CLOCK_MONOTONIC) + n->timeout_usec); | |
121 | if (r < 0) | |
122 | return r; | |
123 | ||
124 | return sd_event_source_set_enabled(n->timer_event_source, SD_EVENT_ONESHOT); | |
125 | } | |
126 | ||
7dfbe2e3 | 127 | r = sd_event_add_time( |
a4152e3f LP |
128 | UNIT(n)->manager->event, |
129 | &n->timer_event_source, | |
130 | CLOCK_MONOTONIC, | |
131 | now(CLOCK_MONOTONIC) + n->timeout_usec, 0, | |
132 | busname_dispatch_timer, n); | |
7dfbe2e3 TG |
133 | if (r < 0) |
134 | return r; | |
135 | ||
136 | (void) sd_event_source_set_description(n->timer_event_source, "busname-timer"); | |
137 | ||
138 | return 0; | |
e821075a LP |
139 | } |
140 | ||
141 | static int busname_add_default_default_dependencies(BusName *n) { | |
142 | int r; | |
143 | ||
144 | assert(n); | |
145 | ||
146 | r = unit_add_dependency_by_name(UNIT(n), UNIT_BEFORE, SPECIAL_BUSNAMES_TARGET, NULL, true); | |
147 | if (r < 0) | |
148 | return r; | |
149 | ||
b2c23da8 | 150 | if (UNIT(n)->manager->running_as == MANAGER_SYSTEM) { |
e821075a LP |
151 | r = unit_add_two_dependencies_by_name(UNIT(n), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SYSINIT_TARGET, NULL, true); |
152 | if (r < 0) | |
153 | return r; | |
154 | } | |
155 | ||
156 | return unit_add_two_dependencies_by_name(UNIT(n), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, NULL, true); | |
157 | } | |
158 | ||
159 | static int busname_add_extras(BusName *n) { | |
160 | Unit *u = UNIT(n); | |
161 | int r; | |
162 | ||
163 | assert(n); | |
164 | ||
165 | if (!n->name) { | |
7410616c LP |
166 | r = unit_name_to_prefix(u->id, &n->name); |
167 | if (r < 0) | |
168 | return r; | |
e821075a LP |
169 | } |
170 | ||
171 | if (!u->description) { | |
172 | r = unit_set_description(u, n->name); | |
173 | if (r < 0) | |
174 | return r; | |
175 | } | |
176 | ||
5892a914 DM |
177 | if (n->activating) { |
178 | if (!UNIT_DEREF(n->service)) { | |
179 | Unit *x; | |
e821075a | 180 | |
5892a914 DM |
181 | r = unit_load_related_unit(u, ".service", &x); |
182 | if (r < 0) | |
183 | return r; | |
184 | ||
185 | unit_ref_set(&n->service, x); | |
186 | } | |
187 | ||
188 | r = unit_add_two_dependencies(u, UNIT_BEFORE, UNIT_TRIGGERS, UNIT_DEREF(n->service), true); | |
e821075a LP |
189 | if (r < 0) |
190 | return r; | |
e821075a LP |
191 | } |
192 | ||
e821075a LP |
193 | if (u->default_dependencies) { |
194 | r = busname_add_default_default_dependencies(n); | |
195 | if (r < 0) | |
196 | return r; | |
197 | } | |
198 | ||
199 | return 0; | |
200 | } | |
201 | ||
e821075a LP |
202 | static int busname_verify(BusName *n) { |
203 | char *e; | |
204 | ||
205 | assert(n); | |
206 | ||
207 | if (UNIT(n)->load_state != UNIT_LOADED) | |
208 | return 0; | |
209 | ||
210 | if (!service_name_is_valid(n->name)) { | |
f2341e0a | 211 | log_unit_error(UNIT(n), "Name= setting is not a valid service name Refusing."); |
e821075a LP |
212 | return -EINVAL; |
213 | } | |
214 | ||
63c372cb | 215 | e = strjoina(n->name, ".busname"); |
e821075a | 216 | if (!unit_has_name(UNIT(n), e)) { |
f2341e0a | 217 | log_unit_error(UNIT(n), "Name= setting doesn't match unit name. Refusing."); |
e821075a LP |
218 | return -EINVAL; |
219 | } | |
220 | ||
221 | return 0; | |
222 | } | |
223 | ||
224 | static int busname_load(Unit *u) { | |
225 | BusName *n = BUSNAME(u); | |
226 | int r; | |
227 | ||
228 | assert(u); | |
229 | assert(u->load_state == UNIT_STUB); | |
230 | ||
231 | r = unit_load_fragment_and_dropin(u); | |
232 | if (r < 0) | |
233 | return r; | |
234 | ||
235 | if (u->load_state == UNIT_LOADED) { | |
236 | /* This is a new unit? Then let's add in some extras */ | |
237 | r = busname_add_extras(n); | |
238 | if (r < 0) | |
239 | return r; | |
240 | } | |
241 | ||
242 | return busname_verify(n); | |
243 | } | |
244 | ||
245 | static void busname_dump(Unit *u, FILE *f, const char *prefix) { | |
246 | BusName *n = BUSNAME(u); | |
247 | ||
248 | assert(n); | |
249 | assert(f); | |
250 | ||
251 | fprintf(f, | |
252 | "%sBus Name State: %s\n" | |
253 | "%sResult: %s\n" | |
3f9da416 | 254 | "%sName: %s\n" |
5892a914 | 255 | "%sActivating: %s\n" |
3f9da416 | 256 | "%sAccept FD: %s\n", |
e821075a LP |
257 | prefix, busname_state_to_string(n->state), |
258 | prefix, busname_result_to_string(n->result), | |
3f9da416 | 259 | prefix, n->name, |
5892a914 | 260 | prefix, yes_no(n->activating), |
3f9da416 | 261 | prefix, yes_no(n->accept_fd)); |
a4152e3f LP |
262 | |
263 | if (n->control_pid > 0) | |
264 | fprintf(f, | |
265 | "%sControl PID: "PID_FMT"\n", | |
266 | prefix, n->control_pid); | |
e821075a LP |
267 | } |
268 | ||
269 | static void busname_unwatch_fd(BusName *n) { | |
270 | int r; | |
271 | ||
272 | assert(n); | |
273 | ||
a4152e3f | 274 | if (!n->starter_event_source) |
e821075a LP |
275 | return; |
276 | ||
a4152e3f LP |
277 | r = sd_event_source_set_enabled(n->starter_event_source, SD_EVENT_OFF); |
278 | if (r < 0) | |
f2341e0a | 279 | log_unit_debug_errno(UNIT(n), r, "Failed to disable event source: %m"); |
e821075a LP |
280 | } |
281 | ||
282 | static int busname_watch_fd(BusName *n) { | |
283 | int r; | |
284 | ||
285 | assert(n); | |
286 | ||
287 | if (n->starter_fd < 0) | |
288 | return 0; | |
289 | ||
a4152e3f LP |
290 | if (n->starter_event_source) |
291 | r = sd_event_source_set_enabled(n->starter_event_source, SD_EVENT_ON); | |
e821075a | 292 | else |
a4152e3f | 293 | r = sd_event_add_io(UNIT(n)->manager->event, &n->starter_event_source, n->starter_fd, EPOLLIN, busname_dispatch_io, n); |
cfa9677b | 294 | |
e821075a | 295 | if (r < 0) { |
f2341e0a | 296 | log_unit_warning_errno(UNIT(n), r, "Failed to watch starter fd: %m"); |
e821075a LP |
297 | busname_unwatch_fd(n); |
298 | return r; | |
299 | } | |
300 | ||
cfa9677b MM |
301 | (void) sd_event_source_set_description(n->starter_event_source, "busname-starter"); |
302 | ||
e821075a LP |
303 | return 0; |
304 | } | |
305 | ||
306 | static int busname_open_fd(BusName *n) { | |
8f077bf9 ZJS |
307 | _cleanup_free_ char *path = NULL; |
308 | const char *mode; | |
309 | ||
e821075a LP |
310 | assert(n); |
311 | ||
312 | if (n->starter_fd >= 0) | |
313 | return 0; | |
314 | ||
b2c23da8 | 315 | mode = UNIT(n)->manager->running_as == MANAGER_SYSTEM ? "system" : "user"; |
8f077bf9 | 316 | n->starter_fd = bus_kernel_open_bus_fd(mode, &path); |
23bbb0de | 317 | if (n->starter_fd < 0) |
f2341e0a | 318 | return log_unit_warning_errno(UNIT(n), n->starter_fd, "Failed to open %s: %m", path ?: "kdbus"); |
e821075a LP |
319 | |
320 | return 0; | |
321 | } | |
322 | ||
323 | static void busname_set_state(BusName *n, BusNameState state) { | |
324 | BusNameState old_state; | |
325 | assert(n); | |
326 | ||
327 | old_state = n->state; | |
328 | n->state = state; | |
329 | ||
a4152e3f LP |
330 | if (!IN_SET(state, BUSNAME_MAKING, BUSNAME_SIGTERM, BUSNAME_SIGKILL)) { |
331 | n->timer_event_source = sd_event_source_unref(n->timer_event_source); | |
332 | busname_unwatch_control_pid(n); | |
333 | } | |
334 | ||
e821075a LP |
335 | if (state != BUSNAME_LISTENING) |
336 | busname_unwatch_fd(n); | |
337 | ||
a4152e3f | 338 | if (!IN_SET(state, BUSNAME_LISTENING, BUSNAME_MAKING, BUSNAME_REGISTERED, BUSNAME_RUNNING)) |
e821075a LP |
339 | busname_close_fd(n); |
340 | ||
341 | if (state != old_state) | |
f2341e0a | 342 | log_unit_debug(UNIT(n), "Changed %s -> %s", busname_state_to_string(old_state), busname_state_to_string(state)); |
e821075a LP |
343 | |
344 | unit_notify(UNIT(n), state_translation_table[old_state], state_translation_table[state], true); | |
345 | } | |
346 | ||
be847e82 | 347 | static int busname_coldplug(Unit *u) { |
e821075a LP |
348 | BusName *n = BUSNAME(u); |
349 | int r; | |
350 | ||
351 | assert(n); | |
352 | assert(n->state == BUSNAME_DEAD); | |
353 | ||
354 | if (n->deserialized_state == n->state) | |
355 | return 0; | |
356 | ||
a4152e3f LP |
357 | if (IN_SET(n->deserialized_state, BUSNAME_MAKING, BUSNAME_SIGTERM, BUSNAME_SIGKILL)) { |
358 | ||
359 | if (n->control_pid <= 0) | |
360 | return -EBADMSG; | |
361 | ||
362 | r = unit_watch_pid(UNIT(n), n->control_pid); | |
363 | if (r < 0) | |
364 | return r; | |
365 | ||
366 | r = busname_arm_timer(n); | |
367 | if (r < 0) | |
368 | return r; | |
369 | } | |
370 | ||
371 | if (IN_SET(n->deserialized_state, BUSNAME_MAKING, BUSNAME_LISTENING, BUSNAME_REGISTERED, BUSNAME_RUNNING)) { | |
e821075a LP |
372 | r = busname_open_fd(n); |
373 | if (r < 0) | |
374 | return r; | |
375 | } | |
376 | ||
377 | if (n->deserialized_state == BUSNAME_LISTENING) { | |
378 | r = busname_watch_fd(n); | |
379 | if (r < 0) | |
380 | return r; | |
381 | } | |
382 | ||
383 | busname_set_state(n, n->deserialized_state); | |
384 | return 0; | |
385 | } | |
386 | ||
a4152e3f LP |
387 | static int busname_make_starter(BusName *n, pid_t *_pid) { |
388 | pid_t pid; | |
389 | int r; | |
390 | ||
391 | r = busname_arm_timer(n); | |
392 | if (r < 0) | |
393 | goto fail; | |
394 | ||
395 | /* We have to resolve the user/group names out-of-process, | |
396 | * hence let's fork here. It's messy, but well, what can we | |
397 | * do? */ | |
398 | ||
399 | pid = fork(); | |
400 | if (pid < 0) | |
401 | return -errno; | |
402 | ||
403 | if (pid == 0) { | |
404 | int ret; | |
405 | ||
406 | default_signals(SIGNALS_CRASH_HANDLER, SIGNALS_IGNORE, -1); | |
407 | ignore_signals(SIGPIPE, -1); | |
408 | log_forget_fds(); | |
409 | ||
410 | r = bus_kernel_make_starter(n->starter_fd, n->name, n->activating, n->accept_fd, n->policy, n->policy_world); | |
411 | if (r < 0) { | |
412 | ret = EXIT_MAKE_STARTER; | |
413 | goto fail_child; | |
414 | } | |
415 | ||
416 | _exit(0); | |
417 | ||
418 | fail_child: | |
419 | log_open(); | |
da927ba9 | 420 | log_error_errno(r, "Failed to create starter connection at step %s: %m", exit_status_to_string(ret, EXIT_STATUS_SYSTEMD)); |
a4152e3f LP |
421 | |
422 | _exit(ret); | |
423 | } | |
424 | ||
425 | r = unit_watch_pid(UNIT(n), pid); | |
426 | if (r < 0) | |
427 | goto fail; | |
428 | ||
429 | *_pid = pid; | |
430 | return 0; | |
431 | ||
432 | fail: | |
433 | n->timer_event_source = sd_event_source_unref(n->timer_event_source); | |
434 | return r; | |
435 | } | |
436 | ||
e821075a LP |
437 | static void busname_enter_dead(BusName *n, BusNameResult f) { |
438 | assert(n); | |
439 | ||
440 | if (f != BUSNAME_SUCCESS) | |
441 | n->result = f; | |
442 | ||
443 | busname_set_state(n, n->result != BUSNAME_SUCCESS ? BUSNAME_FAILED : BUSNAME_DEAD); | |
444 | } | |
445 | ||
a4152e3f LP |
446 | static void busname_enter_signal(BusName *n, BusNameState state, BusNameResult f) { |
447 | KillContext kill_context = {}; | |
e821075a LP |
448 | int r; |
449 | ||
450 | assert(n); | |
451 | ||
a4152e3f LP |
452 | if (f != BUSNAME_SUCCESS) |
453 | n->result = f; | |
454 | ||
455 | kill_context_init(&kill_context); | |
456 | ||
457 | r = unit_kill_context(UNIT(n), | |
458 | &kill_context, | |
db2cb23b | 459 | state != BUSNAME_SIGTERM ? KILL_KILL : KILL_TERMINATE, |
a4152e3f LP |
460 | -1, |
461 | n->control_pid, | |
462 | false); | |
e821075a | 463 | if (r < 0) { |
f2341e0a | 464 | log_unit_warning_errno(UNIT(n), r, "Failed to kill control process: %m"); |
e821075a LP |
465 | goto fail; |
466 | } | |
467 | ||
a4152e3f LP |
468 | if (r > 0) { |
469 | r = busname_arm_timer(n); | |
470 | if (r < 0) { | |
f2341e0a | 471 | log_unit_warning_errno(UNIT(n), r, "Failed to arm timer: %m"); |
a4152e3f LP |
472 | goto fail; |
473 | } | |
474 | ||
475 | busname_set_state(n, state); | |
476 | } else if (state == BUSNAME_SIGTERM) | |
477 | busname_enter_signal(n, BUSNAME_SIGKILL, BUSNAME_SUCCESS); | |
478 | else | |
479 | busname_enter_dead(n, BUSNAME_SUCCESS); | |
480 | ||
481 | return; | |
482 | ||
483 | fail: | |
484 | busname_enter_dead(n, BUSNAME_FAILURE_RESOURCES); | |
485 | } | |
486 | ||
487 | static void busname_enter_listening(BusName *n) { | |
488 | int r; | |
489 | ||
490 | assert(n); | |
491 | ||
5892a914 DM |
492 | if (n->activating) { |
493 | r = busname_watch_fd(n); | |
494 | if (r < 0) { | |
f2341e0a | 495 | log_unit_warning_errno(UNIT(n), r, "Failed to watch names: %m"); |
5892a914 DM |
496 | goto fail; |
497 | } | |
498 | ||
499 | busname_set_state(n, BUSNAME_LISTENING); | |
500 | } else | |
501 | busname_set_state(n, BUSNAME_REGISTERED); | |
e821075a | 502 | |
e821075a LP |
503 | return; |
504 | ||
a4152e3f LP |
505 | fail: |
506 | busname_enter_signal(n, BUSNAME_SIGTERM, BUSNAME_FAILURE_RESOURCES); | |
507 | } | |
508 | ||
509 | static void busname_enter_making(BusName *n) { | |
510 | int r; | |
511 | ||
512 | assert(n); | |
513 | ||
514 | r = busname_open_fd(n); | |
515 | if (r < 0) | |
516 | goto fail; | |
517 | ||
518 | if (n->policy) { | |
8d0e0ddd | 519 | /* If there is a policy, we need to resolve user/group |
a4152e3f LP |
520 | * names, which we can't do from PID1, hence let's |
521 | * fork. */ | |
522 | busname_unwatch_control_pid(n); | |
523 | ||
524 | r = busname_make_starter(n, &n->control_pid); | |
525 | if (r < 0) { | |
f2341e0a | 526 | log_unit_warning_errno(UNIT(n), r, "Failed to fork 'making' task: %m"); |
a4152e3f LP |
527 | goto fail; |
528 | } | |
529 | ||
530 | busname_set_state(n, BUSNAME_MAKING); | |
531 | } else { | |
8d0e0ddd | 532 | /* If there is no policy, we can do everything |
a4152e3f LP |
533 | * directly from PID 1, hence do so. */ |
534 | ||
535 | r = bus_kernel_make_starter(n->starter_fd, n->name, n->activating, n->accept_fd, NULL, n->policy_world); | |
536 | if (r < 0) { | |
f2341e0a | 537 | log_unit_warning_errno(UNIT(n), r, "Failed to make starter: %m"); |
a4152e3f LP |
538 | goto fail; |
539 | } | |
540 | ||
541 | busname_enter_listening(n); | |
542 | } | |
543 | ||
544 | return; | |
545 | ||
e821075a LP |
546 | fail: |
547 | busname_enter_dead(n, BUSNAME_FAILURE_RESOURCES); | |
548 | } | |
549 | ||
550 | static void busname_enter_running(BusName *n) { | |
551 | _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; | |
552 | bool pending = false; | |
553 | Unit *other; | |
554 | Iterator i; | |
555 | int r; | |
556 | ||
557 | assert(n); | |
558 | ||
5892a914 DM |
559 | if (!n->activating) |
560 | return; | |
561 | ||
05a08cb6 | 562 | /* We don't take connections anymore if we are supposed to |
e821075a LP |
563 | * shut down anyway */ |
564 | ||
565 | if (unit_stop_pending(UNIT(n))) { | |
f2341e0a | 566 | log_unit_debug(UNIT(n), "Suppressing activation request since unit stop is scheduled."); |
16ac4014 LP |
567 | |
568 | /* Flush all queued activation reqeuest by closing and reopening the connection */ | |
ff975efb | 569 | bus_kernel_drop_one(n->starter_fd); |
16ac4014 | 570 | |
16ac4014 | 571 | busname_enter_listening(n); |
e821075a LP |
572 | return; |
573 | } | |
574 | ||
575 | /* If there's already a start pending don't bother to do | |
576 | * anything */ | |
577 | SET_FOREACH(other, UNIT(n)->dependencies[UNIT_TRIGGERS], i) | |
578 | if (unit_active_or_pending(other)) { | |
579 | pending = true; | |
580 | break; | |
581 | } | |
582 | ||
583 | if (!pending) { | |
584 | r = manager_add_job(UNIT(n)->manager, JOB_START, UNIT_DEREF(n->service), JOB_REPLACE, true, &error, NULL); | |
585 | if (r < 0) | |
586 | goto fail; | |
587 | } | |
588 | ||
589 | busname_set_state(n, BUSNAME_RUNNING); | |
590 | return; | |
591 | ||
592 | fail: | |
f2341e0a | 593 | log_unit_warning(UNIT(n), "Failed to queue service startup job: %s", bus_error_message(&error, r)); |
e821075a LP |
594 | busname_enter_dead(n, BUSNAME_FAILURE_RESOURCES); |
595 | } | |
596 | ||
597 | static int busname_start(Unit *u) { | |
598 | BusName *n = BUSNAME(u); | |
599 | ||
600 | assert(n); | |
601 | ||
a4152e3f LP |
602 | /* We cannot fulfill this request right now, try again later |
603 | * please! */ | |
604 | if (IN_SET(n->state, BUSNAME_SIGTERM, BUSNAME_SIGKILL)) | |
605 | return -EAGAIN; | |
606 | ||
607 | /* Already on it! */ | |
608 | if (n->state == BUSNAME_MAKING) | |
609 | return 0; | |
610 | ||
5892a914 | 611 | if (n->activating && UNIT_ISSET(n->service)) { |
e821075a LP |
612 | Service *service; |
613 | ||
614 | service = SERVICE(UNIT_DEREF(n->service)); | |
615 | ||
616 | if (UNIT(service)->load_state != UNIT_LOADED) { | |
f2341e0a | 617 | log_unit_error(u, "Bus service %s not loaded, refusing.", UNIT(service)->id); |
e821075a LP |
618 | return -ENOENT; |
619 | } | |
620 | } | |
621 | ||
622 | assert(IN_SET(n->state, BUSNAME_DEAD, BUSNAME_FAILED)); | |
623 | ||
624 | n->result = BUSNAME_SUCCESS; | |
a4152e3f | 625 | busname_enter_making(n); |
e821075a | 626 | |
82a2b6bb | 627 | return 1; |
e821075a LP |
628 | } |
629 | ||
630 | static int busname_stop(Unit *u) { | |
631 | BusName *n = BUSNAME(u); | |
632 | ||
633 | assert(n); | |
a4152e3f LP |
634 | |
635 | /* Already on it */ | |
636 | if (IN_SET(n->state, BUSNAME_SIGTERM, BUSNAME_SIGKILL)) | |
637 | return 0; | |
638 | ||
639 | /* If there's already something running, we go directly into | |
640 | * kill mode. */ | |
641 | ||
642 | if (n->state == BUSNAME_MAKING) { | |
643 | busname_enter_signal(n, BUSNAME_SIGTERM, BUSNAME_SUCCESS); | |
644 | return -EAGAIN; | |
645 | } | |
646 | ||
5892a914 | 647 | assert(IN_SET(n->state, BUSNAME_REGISTERED, BUSNAME_LISTENING, BUSNAME_RUNNING)); |
e821075a LP |
648 | |
649 | busname_enter_dead(n, BUSNAME_SUCCESS); | |
82a2b6bb | 650 | return 1; |
e821075a LP |
651 | } |
652 | ||
653 | static int busname_serialize(Unit *u, FILE *f, FDSet *fds) { | |
654 | BusName *n = BUSNAME(u); | |
655 | ||
656 | assert(n); | |
657 | assert(f); | |
658 | assert(fds); | |
659 | ||
660 | unit_serialize_item(u, f, "state", busname_state_to_string(n->state)); | |
661 | unit_serialize_item(u, f, "result", busname_result_to_string(n->result)); | |
662 | ||
a4152e3f LP |
663 | if (n->control_pid > 0) |
664 | unit_serialize_item_format(u, f, "control-pid", PID_FMT, n->control_pid); | |
665 | ||
e821075a LP |
666 | if (n->starter_fd >= 0) { |
667 | int copy; | |
668 | ||
669 | copy = fdset_put_dup(fds, n->starter_fd); | |
670 | if (copy < 0) | |
671 | return copy; | |
672 | ||
673 | unit_serialize_item_format(u, f, "starter-fd", "%i", copy); | |
674 | } | |
675 | ||
676 | return 0; | |
677 | } | |
678 | ||
679 | static int busname_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { | |
680 | BusName *n = BUSNAME(u); | |
681 | ||
682 | assert(n); | |
683 | assert(key); | |
684 | assert(value); | |
685 | ||
686 | if (streq(key, "state")) { | |
687 | BusNameState state; | |
688 | ||
689 | state = busname_state_from_string(value); | |
690 | if (state < 0) | |
f2341e0a | 691 | log_unit_debug(u, "Failed to parse state value: %s", value); |
e821075a LP |
692 | else |
693 | n->deserialized_state = state; | |
694 | ||
695 | } else if (streq(key, "result")) { | |
696 | BusNameResult f; | |
697 | ||
698 | f = busname_result_from_string(value); | |
699 | if (f < 0) | |
f2341e0a | 700 | log_unit_debug(u, "Failed to parse result value: %s", value); |
e821075a LP |
701 | else if (f != BUSNAME_SUCCESS) |
702 | n->result = f; | |
703 | ||
a4152e3f LP |
704 | } else if (streq(key, "control-pid")) { |
705 | pid_t pid; | |
706 | ||
707 | if (parse_pid(value, &pid) < 0) | |
f2341e0a | 708 | log_unit_debug(u, "Failed to parse control-pid value: %s", value); |
a4152e3f LP |
709 | else |
710 | n->control_pid = pid; | |
e821075a LP |
711 | } else if (streq(key, "starter-fd")) { |
712 | int fd; | |
713 | ||
714 | if (safe_atoi(value, &fd) < 0 || fd < 0 || !fdset_contains(fds, fd)) | |
f2341e0a | 715 | log_unit_debug(u, "Failed to parse starter fd value: %s", value); |
e821075a | 716 | else { |
03e334a1 | 717 | safe_close(n->starter_fd); |
e821075a LP |
718 | n->starter_fd = fdset_remove(fds, fd); |
719 | } | |
720 | } else | |
f2341e0a | 721 | log_unit_debug(u, "Unknown serialization key: %s", key); |
e821075a LP |
722 | |
723 | return 0; | |
724 | } | |
725 | ||
726 | _pure_ static UnitActiveState busname_active_state(Unit *u) { | |
727 | assert(u); | |
728 | ||
729 | return state_translation_table[BUSNAME(u)->state]; | |
730 | } | |
731 | ||
732 | _pure_ static const char *busname_sub_state_to_string(Unit *u) { | |
733 | assert(u); | |
734 | ||
735 | return busname_state_to_string(BUSNAME(u)->state); | |
736 | } | |
737 | ||
bd5f920f LP |
738 | static int busname_peek_message(BusName *n) { |
739 | struct kdbus_cmd_recv cmd_recv = { | |
94e15fdc | 740 | .size = sizeof(cmd_recv), |
bd5f920f LP |
741 | .flags = KDBUS_RECV_PEEK, |
742 | }; | |
e24e415e DM |
743 | struct kdbus_cmd_free cmd_free = { |
744 | .size = sizeof(cmd_free), | |
745 | }; | |
bd5f920f LP |
746 | const char *comm = NULL; |
747 | struct kdbus_item *d; | |
748 | struct kdbus_msg *k; | |
749 | size_t start, ps, sz, delta; | |
750 | void *p = NULL; | |
751 | pid_t pid = 0; | |
752 | int r; | |
753 | ||
dcc2fc01 LP |
754 | /* Generate a friendly debug log message about which process |
755 | * caused triggering of this bus name. This simply peeks the | |
756 | * metadata of the first queued message and logs it. */ | |
757 | ||
bd5f920f LP |
758 | assert(n); |
759 | ||
dcc2fc01 LP |
760 | /* Let's shortcut things a bit, if debug logging is turned off |
761 | * anyway. */ | |
762 | ||
763 | if (log_get_max_level() < LOG_DEBUG) | |
764 | return 0; | |
bd5f920f | 765 | |
94e15fdc | 766 | r = ioctl(n->starter_fd, KDBUS_CMD_RECV, &cmd_recv); |
bd5f920f LP |
767 | if (r < 0) { |
768 | if (errno == EINTR || errno == EAGAIN) | |
769 | return 0; | |
770 | ||
f2341e0a | 771 | return log_unit_error_errno(UNIT(n), errno, "Failed to query activation message: %m"); |
bd5f920f LP |
772 | } |
773 | ||
774 | /* We map as late as possible, and unmap imemdiately after | |
775 | * use. On 32bit address space is scarce and we want to be | |
776 | * able to handle a lot of activator connections at the same | |
777 | * time, and hence shouldn't keep the mmap()s around for | |
778 | * longer than necessary. */ | |
779 | ||
780 | ps = page_size(); | |
a9c8343e DM |
781 | start = (cmd_recv.msg.offset / ps) * ps; |
782 | delta = cmd_recv.msg.offset - start; | |
783 | sz = PAGE_ALIGN(delta + cmd_recv.msg.msg_size); | |
bd5f920f LP |
784 | |
785 | p = mmap(NULL, sz, PROT_READ, MAP_SHARED, n->starter_fd, start); | |
786 | if (p == MAP_FAILED) { | |
f2341e0a | 787 | r = log_unit_error_errno(UNIT(n), errno, "Failed to map activation message: %m"); |
bd5f920f LP |
788 | goto finish; |
789 | } | |
790 | ||
791 | k = (struct kdbus_msg *) ((uint8_t *) p + delta); | |
792 | KDBUS_ITEM_FOREACH(d, k, items) { | |
793 | switch (d->type) { | |
794 | ||
795 | case KDBUS_ITEM_PIDS: | |
796 | pid = d->pids.pid; | |
797 | break; | |
798 | ||
799 | case KDBUS_ITEM_PID_COMM: | |
800 | comm = d->str; | |
801 | break; | |
802 | } | |
803 | } | |
804 | ||
805 | if (pid > 0) | |
f2341e0a | 806 | log_unit_debug(UNIT(n), "Activation triggered by process " PID_FMT " (%s)", pid, strna(comm)); |
bd5f920f LP |
807 | |
808 | r = 0; | |
809 | ||
810 | finish: | |
811 | if (p) | |
812 | (void) munmap(p, sz); | |
813 | ||
a9c8343e | 814 | cmd_free.offset = cmd_recv.msg.offset; |
dcc2fc01 | 815 | if (ioctl(n->starter_fd, KDBUS_CMD_FREE, &cmd_free) < 0) |
f2341e0a | 816 | log_unit_warning(UNIT(n), "Failed to free peeked message, ignoring: %m"); |
bd5f920f LP |
817 | |
818 | return r; | |
819 | } | |
820 | ||
e821075a LP |
821 | static int busname_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) { |
822 | BusName *n = userdata; | |
823 | ||
824 | assert(n); | |
825 | assert(fd >= 0); | |
826 | ||
827 | if (n->state != BUSNAME_LISTENING) | |
828 | return 0; | |
829 | ||
f2341e0a | 830 | log_unit_debug(UNIT(n), "Activation request"); |
e821075a LP |
831 | |
832 | if (revents != EPOLLIN) { | |
f2341e0a | 833 | log_unit_error(UNIT(n), "Got unexpected poll event (0x%x) on starter fd.", revents); |
e821075a LP |
834 | goto fail; |
835 | } | |
836 | ||
bd5f920f | 837 | busname_peek_message(n); |
e821075a LP |
838 | busname_enter_running(n); |
839 | return 0; | |
840 | fail: | |
841 | ||
842 | busname_enter_dead(n, BUSNAME_FAILURE_RESOURCES); | |
843 | return 0; | |
844 | } | |
845 | ||
a4152e3f LP |
846 | static void busname_sigchld_event(Unit *u, pid_t pid, int code, int status) { |
847 | BusName *n = BUSNAME(u); | |
848 | BusNameResult f; | |
849 | ||
850 | assert(n); | |
851 | assert(pid >= 0); | |
852 | ||
853 | if (pid != n->control_pid) | |
854 | return; | |
855 | ||
856 | n->control_pid = 0; | |
857 | ||
858 | if (is_clean_exit(code, status, NULL)) | |
859 | f = BUSNAME_SUCCESS; | |
860 | else if (code == CLD_EXITED) | |
861 | f = BUSNAME_FAILURE_EXIT_CODE; | |
862 | else if (code == CLD_KILLED) | |
863 | f = BUSNAME_FAILURE_SIGNAL; | |
deffddf1 | 864 | else if (code == CLD_DUMPED) |
a4152e3f LP |
865 | f = BUSNAME_FAILURE_CORE_DUMP; |
866 | else | |
867 | assert_not_reached("Unknown sigchld code"); | |
868 | ||
f2341e0a LP |
869 | log_unit_full(u, f == BUSNAME_SUCCESS ? LOG_DEBUG : LOG_NOTICE, 0, |
870 | "Control process exited, code=%s status=%i", sigchld_code_to_string(code), status); | |
a4152e3f LP |
871 | |
872 | if (f != BUSNAME_SUCCESS) | |
873 | n->result = f; | |
874 | ||
875 | switch (n->state) { | |
876 | ||
877 | case BUSNAME_MAKING: | |
878 | if (f == BUSNAME_SUCCESS) | |
879 | busname_enter_listening(n); | |
880 | else | |
881 | busname_enter_signal(n, BUSNAME_SIGTERM, f); | |
882 | break; | |
883 | ||
884 | case BUSNAME_SIGTERM: | |
885 | case BUSNAME_SIGKILL: | |
886 | busname_enter_dead(n, f); | |
887 | break; | |
888 | ||
889 | default: | |
890 | assert_not_reached("Uh, control process died at wrong time."); | |
891 | } | |
892 | ||
893 | /* Notify clients about changed exit status */ | |
894 | unit_add_to_dbus_queue(u); | |
895 | } | |
896 | ||
897 | static int busname_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) { | |
898 | BusName *n = BUSNAME(userdata); | |
899 | ||
900 | assert(n); | |
901 | assert(n->timer_event_source == source); | |
902 | ||
903 | switch (n->state) { | |
904 | ||
905 | case BUSNAME_MAKING: | |
f2341e0a | 906 | log_unit_warning(UNIT(n), "Making timed out. Terminating."); |
a4152e3f LP |
907 | busname_enter_signal(n, BUSNAME_SIGTERM, BUSNAME_FAILURE_TIMEOUT); |
908 | break; | |
909 | ||
910 | case BUSNAME_SIGTERM: | |
f2341e0a | 911 | log_unit_warning(UNIT(n), "Stopping timed out. Killing."); |
a4152e3f LP |
912 | busname_enter_signal(n, BUSNAME_SIGKILL, BUSNAME_FAILURE_TIMEOUT); |
913 | break; | |
914 | ||
915 | case BUSNAME_SIGKILL: | |
f2341e0a | 916 | log_unit_warning(UNIT(n), "Processes still around after SIGKILL. Ignoring."); |
a4152e3f LP |
917 | busname_enter_dead(n, BUSNAME_FAILURE_TIMEOUT); |
918 | break; | |
919 | ||
920 | default: | |
921 | assert_not_reached("Timeout at wrong time."); | |
922 | } | |
923 | ||
924 | return 0; | |
925 | } | |
926 | ||
e821075a LP |
927 | static void busname_reset_failed(Unit *u) { |
928 | BusName *n = BUSNAME(u); | |
929 | ||
930 | assert(n); | |
931 | ||
932 | if (n->state == BUSNAME_FAILED) | |
933 | busname_set_state(n, BUSNAME_DEAD); | |
934 | ||
935 | n->result = BUSNAME_SUCCESS; | |
936 | } | |
937 | ||
938 | static void busname_trigger_notify(Unit *u, Unit *other) { | |
939 | BusName *n = BUSNAME(u); | |
940 | Service *s; | |
941 | ||
942 | assert(n); | |
943 | assert(other); | |
944 | ||
945 | if (!IN_SET(n->state, BUSNAME_RUNNING, BUSNAME_LISTENING)) | |
946 | return; | |
947 | ||
948 | if (other->load_state != UNIT_LOADED || other->type != UNIT_SERVICE) | |
949 | return; | |
950 | ||
951 | s = SERVICE(other); | |
952 | ||
2f671520 LP |
953 | if (s->state == SERVICE_FAILED && s->result == SERVICE_FAILURE_START_LIMIT) |
954 | busname_enter_dead(n, BUSNAME_FAILURE_SERVICE_FAILED_PERMANENT); | |
955 | else if (IN_SET(s->state, | |
956 | SERVICE_DEAD, SERVICE_FAILED, | |
957 | SERVICE_STOP, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL, | |
958 | SERVICE_STOP_POST, SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL, | |
959 | SERVICE_AUTO_RESTART)) | |
e821075a LP |
960 | busname_enter_listening(n); |
961 | } | |
962 | ||
a4152e3f LP |
963 | static int busname_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) { |
964 | return unit_kill_common(u, who, signo, -1, BUSNAME(u)->control_pid, error); | |
965 | } | |
966 | ||
967 | static int busname_get_timeout(Unit *u, uint64_t *timeout) { | |
968 | BusName *n = BUSNAME(u); | |
969 | int r; | |
970 | ||
971 | if (!n->timer_event_source) | |
972 | return 0; | |
973 | ||
974 | r = sd_event_source_get_time(n->timer_event_source, timeout); | |
975 | if (r < 0) | |
976 | return r; | |
977 | ||
978 | return 1; | |
979 | } | |
980 | ||
1c2e9646 | 981 | static bool busname_supported(void) { |
d69a7cea | 982 | static int supported = -1; |
0faacd47 LP |
983 | |
984 | if (supported < 0) | |
d79acc30 | 985 | supported = is_kdbus_available(); |
0faacd47 LP |
986 | |
987 | return supported; | |
988 | } | |
989 | ||
e821075a LP |
990 | static const char* const busname_state_table[_BUSNAME_STATE_MAX] = { |
991 | [BUSNAME_DEAD] = "dead", | |
a4152e3f | 992 | [BUSNAME_MAKING] = "making", |
5892a914 | 993 | [BUSNAME_REGISTERED] = "registered", |
e821075a LP |
994 | [BUSNAME_LISTENING] = "listening", |
995 | [BUSNAME_RUNNING] = "running", | |
a4152e3f LP |
996 | [BUSNAME_SIGTERM] = "sigterm", |
997 | [BUSNAME_SIGKILL] = "sigkill", | |
998 | [BUSNAME_FAILED] = "failed", | |
e821075a LP |
999 | }; |
1000 | ||
1001 | DEFINE_STRING_TABLE_LOOKUP(busname_state, BusNameState); | |
1002 | ||
1003 | static const char* const busname_result_table[_BUSNAME_RESULT_MAX] = { | |
1004 | [BUSNAME_SUCCESS] = "success", | |
1005 | [BUSNAME_FAILURE_RESOURCES] = "resources", | |
a4152e3f LP |
1006 | [BUSNAME_FAILURE_TIMEOUT] = "timeout", |
1007 | [BUSNAME_FAILURE_EXIT_CODE] = "exit-code", | |
1008 | [BUSNAME_FAILURE_SIGNAL] = "signal", | |
1009 | [BUSNAME_FAILURE_CORE_DUMP] = "core-dump", | |
700ff4d9 | 1010 | [BUSNAME_FAILURE_SERVICE_FAILED_PERMANENT] = "service-failed-permanent", |
e821075a LP |
1011 | }; |
1012 | ||
1013 | DEFINE_STRING_TABLE_LOOKUP(busname_result, BusNameResult); | |
1014 | ||
1015 | const UnitVTable busname_vtable = { | |
1016 | .object_size = sizeof(BusName), | |
1017 | ||
1018 | .sections = | |
1019 | "Unit\0" | |
1020 | "BusName\0" | |
1021 | "Install\0", | |
1022 | .private_section = "BusName", | |
1023 | ||
e05ad7bc LP |
1024 | .no_alias = true, |
1025 | .no_instances = true, | |
1026 | ||
e821075a LP |
1027 | .init = busname_init, |
1028 | .done = busname_done, | |
1029 | .load = busname_load, | |
1030 | ||
1031 | .coldplug = busname_coldplug, | |
1032 | ||
1033 | .dump = busname_dump, | |
1034 | ||
1035 | .start = busname_start, | |
1036 | .stop = busname_stop, | |
1037 | ||
a4152e3f LP |
1038 | .kill = busname_kill, |
1039 | ||
1040 | .get_timeout = busname_get_timeout, | |
1041 | ||
e821075a LP |
1042 | .serialize = busname_serialize, |
1043 | .deserialize_item = busname_deserialize_item, | |
1044 | ||
1045 | .active_state = busname_active_state, | |
1046 | .sub_state_to_string = busname_sub_state_to_string, | |
1047 | ||
a4152e3f LP |
1048 | .sigchld_event = busname_sigchld_event, |
1049 | ||
e821075a LP |
1050 | .trigger_notify = busname_trigger_notify, |
1051 | ||
1052 | .reset_failed = busname_reset_failed, | |
1053 | ||
0faacd47 LP |
1054 | .supported = busname_supported, |
1055 | ||
e821075a LP |
1056 | .bus_interface = "org.freedesktop.systemd1.BusName", |
1057 | .bus_vtable = bus_busname_vtable, | |
e821075a LP |
1058 | |
1059 | .status_message_formats = { | |
1060 | .finished_start_job = { | |
1061 | [JOB_DONE] = "Listening on %s.", | |
1062 | [JOB_FAILED] = "Failed to listen on %s.", | |
1063 | [JOB_DEPENDENCY] = "Dependency failed for %s.", | |
1064 | [JOB_TIMEOUT] = "Timed out starting %s.", | |
1065 | }, | |
1066 | .finished_stop_job = { | |
1067 | [JOB_DONE] = "Closed %s.", | |
1068 | [JOB_FAILED] = "Failed stopping %s.", | |
1069 | [JOB_TIMEOUT] = "Timed out stopping %s.", | |
1070 | }, | |
1071 | }, | |
1072 | }; |