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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 | ||
b5efdb8a | 24 | #include "alloc-util.h" |
e821075a | 25 | #include "bus-internal.h" |
07630cea LP |
26 | #include "bus-kernel.h" |
27 | #include "bus-policy.h" | |
e821075a | 28 | #include "bus-util.h" |
3ffd4af2 | 29 | #include "busname.h" |
07630cea | 30 | #include "dbus-busname.h" |
3ffd4af2 | 31 | #include "fd-util.h" |
07630cea | 32 | #include "formats-util.h" |
3c70e3bb | 33 | #include "kdbus.h" |
6bedfcbb | 34 | #include "parse-util.h" |
7b3e062c | 35 | #include "process-util.h" |
24882e06 | 36 | #include "service.h" |
07630cea LP |
37 | #include "signal-util.h" |
38 | #include "special.h" | |
8b43440b | 39 | #include "string-table.h" |
07630cea | 40 | #include "string-util.h" |
e821075a LP |
41 | |
42 | static const UnitActiveState state_translation_table[_BUSNAME_STATE_MAX] = { | |
43 | [BUSNAME_DEAD] = UNIT_INACTIVE, | |
a4152e3f | 44 | [BUSNAME_MAKING] = UNIT_ACTIVATING, |
5892a914 | 45 | [BUSNAME_REGISTERED] = UNIT_ACTIVE, |
e821075a LP |
46 | [BUSNAME_LISTENING] = UNIT_ACTIVE, |
47 | [BUSNAME_RUNNING] = UNIT_ACTIVE, | |
a4152e3f LP |
48 | [BUSNAME_SIGTERM] = UNIT_DEACTIVATING, |
49 | [BUSNAME_SIGKILL] = UNIT_DEACTIVATING, | |
e821075a LP |
50 | [BUSNAME_FAILED] = UNIT_FAILED |
51 | }; | |
52 | ||
53 | static int busname_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata); | |
a4152e3f | 54 | static int busname_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata); |
e821075a LP |
55 | |
56 | static void busname_init(Unit *u) { | |
57 | BusName *n = BUSNAME(u); | |
58 | ||
59 | assert(u); | |
60 | assert(u->load_state == UNIT_STUB); | |
61 | ||
62 | n->starter_fd = -1; | |
3f9da416 | 63 | n->accept_fd = true; |
4f101180 | 64 | n->activating = true; |
a4152e3f LP |
65 | |
66 | n->timeout_usec = u->manager->default_timeout_start_usec; | |
67 | } | |
68 | ||
69 | static void busname_unwatch_control_pid(BusName *n) { | |
70 | assert(n); | |
71 | ||
72 | if (n->control_pid <= 0) | |
73 | return; | |
74 | ||
75 | unit_unwatch_pid(UNIT(n), n->control_pid); | |
76 | n->control_pid = 0; | |
77 | } | |
78 | ||
79 | static void busname_free_policy(BusName *n) { | |
80 | BusNamePolicy *p; | |
81 | ||
82 | assert(n); | |
83 | ||
84 | while ((p = n->policy)) { | |
85 | LIST_REMOVE(policy, n->policy, p); | |
86 | ||
87 | free(p->name); | |
88 | free(p); | |
89 | } | |
90 | } | |
91 | ||
92 | static void busname_close_fd(BusName *n) { | |
93 | assert(n); | |
94 | ||
95 | n->starter_event_source = sd_event_source_unref(n->starter_event_source); | |
96 | n->starter_fd = safe_close(n->starter_fd); | |
e821075a LP |
97 | } |
98 | ||
99 | static void busname_done(Unit *u) { | |
100 | BusName *n = BUSNAME(u); | |
101 | ||
a4152e3f | 102 | assert(n); |
e821075a | 103 | |
a1e58e8e | 104 | n->name = mfree(n->name); |
e821075a | 105 | |
a4152e3f LP |
106 | busname_free_policy(n); |
107 | busname_unwatch_control_pid(n); | |
108 | busname_close_fd(n); | |
109 | ||
e821075a LP |
110 | unit_ref_unset(&n->service); |
111 | ||
a4152e3f LP |
112 | n->timer_event_source = sd_event_source_unref(n->timer_event_source); |
113 | } | |
114 | ||
115 | static int busname_arm_timer(BusName *n) { | |
116 | int r; | |
117 | ||
118 | assert(n); | |
119 | ||
120 | if (n->timeout_usec <= 0) { | |
121 | n->timer_event_source = sd_event_source_unref(n->timer_event_source); | |
122 | return 0; | |
123 | } | |
124 | ||
125 | if (n->timer_event_source) { | |
126 | r = sd_event_source_set_time(n->timer_event_source, now(CLOCK_MONOTONIC) + n->timeout_usec); | |
127 | if (r < 0) | |
128 | return r; | |
129 | ||
130 | return sd_event_source_set_enabled(n->timer_event_source, SD_EVENT_ONESHOT); | |
131 | } | |
132 | ||
920b52e4 | 133 | r = sd_event_add_time( |
a4152e3f LP |
134 | UNIT(n)->manager->event, |
135 | &n->timer_event_source, | |
136 | CLOCK_MONOTONIC, | |
137 | now(CLOCK_MONOTONIC) + n->timeout_usec, 0, | |
138 | busname_dispatch_timer, n); | |
7dfbe2e3 TG |
139 | if (r < 0) |
140 | return r; | |
141 | ||
142 | (void) sd_event_source_set_description(n->timer_event_source, "busname-timer"); | |
143 | ||
144 | return 0; | |
e821075a LP |
145 | } |
146 | ||
147 | static int busname_add_default_default_dependencies(BusName *n) { | |
148 | int r; | |
149 | ||
150 | assert(n); | |
151 | ||
152 | r = unit_add_dependency_by_name(UNIT(n), UNIT_BEFORE, SPECIAL_BUSNAMES_TARGET, NULL, true); | |
153 | if (r < 0) | |
154 | return r; | |
155 | ||
b2c23da8 | 156 | if (UNIT(n)->manager->running_as == MANAGER_SYSTEM) { |
e821075a LP |
157 | r = unit_add_two_dependencies_by_name(UNIT(n), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SYSINIT_TARGET, NULL, true); |
158 | if (r < 0) | |
159 | return r; | |
160 | } | |
161 | ||
162 | return unit_add_two_dependencies_by_name(UNIT(n), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, NULL, true); | |
163 | } | |
164 | ||
165 | static int busname_add_extras(BusName *n) { | |
166 | Unit *u = UNIT(n); | |
167 | int r; | |
168 | ||
169 | assert(n); | |
170 | ||
171 | if (!n->name) { | |
7410616c LP |
172 | r = unit_name_to_prefix(u->id, &n->name); |
173 | if (r < 0) | |
174 | return r; | |
e821075a LP |
175 | } |
176 | ||
177 | if (!u->description) { | |
178 | r = unit_set_description(u, n->name); | |
179 | if (r < 0) | |
180 | return r; | |
181 | } | |
182 | ||
5892a914 DM |
183 | if (n->activating) { |
184 | if (!UNIT_DEREF(n->service)) { | |
185 | Unit *x; | |
e821075a | 186 | |
5892a914 DM |
187 | r = unit_load_related_unit(u, ".service", &x); |
188 | if (r < 0) | |
189 | return r; | |
190 | ||
191 | unit_ref_set(&n->service, x); | |
192 | } | |
193 | ||
194 | r = unit_add_two_dependencies(u, UNIT_BEFORE, UNIT_TRIGGERS, UNIT_DEREF(n->service), true); | |
e821075a LP |
195 | if (r < 0) |
196 | return r; | |
e821075a LP |
197 | } |
198 | ||
e821075a LP |
199 | if (u->default_dependencies) { |
200 | r = busname_add_default_default_dependencies(n); | |
201 | if (r < 0) | |
202 | return r; | |
203 | } | |
204 | ||
205 | return 0; | |
206 | } | |
207 | ||
e821075a LP |
208 | static int busname_verify(BusName *n) { |
209 | char *e; | |
210 | ||
211 | assert(n); | |
212 | ||
213 | if (UNIT(n)->load_state != UNIT_LOADED) | |
214 | return 0; | |
215 | ||
216 | if (!service_name_is_valid(n->name)) { | |
f2341e0a | 217 | log_unit_error(UNIT(n), "Name= setting is not a valid service name Refusing."); |
e821075a LP |
218 | return -EINVAL; |
219 | } | |
220 | ||
63c372cb | 221 | e = strjoina(n->name, ".busname"); |
e821075a | 222 | if (!unit_has_name(UNIT(n), e)) { |
f2341e0a | 223 | log_unit_error(UNIT(n), "Name= setting doesn't match unit name. Refusing."); |
e821075a LP |
224 | return -EINVAL; |
225 | } | |
226 | ||
227 | return 0; | |
228 | } | |
229 | ||
230 | static int busname_load(Unit *u) { | |
231 | BusName *n = BUSNAME(u); | |
232 | int r; | |
233 | ||
234 | assert(u); | |
235 | assert(u->load_state == UNIT_STUB); | |
236 | ||
237 | r = unit_load_fragment_and_dropin(u); | |
238 | if (r < 0) | |
239 | return r; | |
240 | ||
241 | if (u->load_state == UNIT_LOADED) { | |
242 | /* This is a new unit? Then let's add in some extras */ | |
243 | r = busname_add_extras(n); | |
244 | if (r < 0) | |
245 | return r; | |
246 | } | |
247 | ||
248 | return busname_verify(n); | |
249 | } | |
250 | ||
251 | static void busname_dump(Unit *u, FILE *f, const char *prefix) { | |
252 | BusName *n = BUSNAME(u); | |
253 | ||
254 | assert(n); | |
255 | assert(f); | |
256 | ||
257 | fprintf(f, | |
258 | "%sBus Name State: %s\n" | |
259 | "%sResult: %s\n" | |
3f9da416 | 260 | "%sName: %s\n" |
5892a914 | 261 | "%sActivating: %s\n" |
3f9da416 | 262 | "%sAccept FD: %s\n", |
e821075a LP |
263 | prefix, busname_state_to_string(n->state), |
264 | prefix, busname_result_to_string(n->result), | |
3f9da416 | 265 | prefix, n->name, |
5892a914 | 266 | prefix, yes_no(n->activating), |
3f9da416 | 267 | prefix, yes_no(n->accept_fd)); |
a4152e3f LP |
268 | |
269 | if (n->control_pid > 0) | |
270 | fprintf(f, | |
271 | "%sControl PID: "PID_FMT"\n", | |
272 | prefix, n->control_pid); | |
e821075a LP |
273 | } |
274 | ||
275 | static void busname_unwatch_fd(BusName *n) { | |
276 | int r; | |
277 | ||
278 | assert(n); | |
279 | ||
a4152e3f | 280 | if (!n->starter_event_source) |
e821075a LP |
281 | return; |
282 | ||
a4152e3f LP |
283 | r = sd_event_source_set_enabled(n->starter_event_source, SD_EVENT_OFF); |
284 | if (r < 0) | |
f2341e0a | 285 | log_unit_debug_errno(UNIT(n), r, "Failed to disable event source: %m"); |
e821075a LP |
286 | } |
287 | ||
288 | static int busname_watch_fd(BusName *n) { | |
289 | int r; | |
290 | ||
291 | assert(n); | |
292 | ||
293 | if (n->starter_fd < 0) | |
294 | return 0; | |
295 | ||
cbf60d0a | 296 | if (n->starter_event_source) { |
a4152e3f | 297 | r = sd_event_source_set_enabled(n->starter_event_source, SD_EVENT_ON); |
cbf60d0a LP |
298 | if (r < 0) |
299 | goto fail; | |
300 | } else { | |
a4152e3f | 301 | r = sd_event_add_io(UNIT(n)->manager->event, &n->starter_event_source, n->starter_fd, EPOLLIN, busname_dispatch_io, n); |
cbf60d0a LP |
302 | if (r < 0) |
303 | goto fail; | |
cfa9677b | 304 | |
cbf60d0a | 305 | (void) sd_event_source_set_description(n->starter_event_source, "busname-starter"); |
e821075a LP |
306 | } |
307 | ||
308 | return 0; | |
cbf60d0a LP |
309 | |
310 | fail: | |
311 | log_unit_warning_errno(UNIT(n), r, "Failed to watch starter fd: %m"); | |
312 | busname_unwatch_fd(n); | |
313 | return r; | |
e821075a LP |
314 | } |
315 | ||
316 | static int busname_open_fd(BusName *n) { | |
8f077bf9 ZJS |
317 | _cleanup_free_ char *path = NULL; |
318 | const char *mode; | |
319 | ||
e821075a LP |
320 | assert(n); |
321 | ||
322 | if (n->starter_fd >= 0) | |
323 | return 0; | |
324 | ||
b2c23da8 | 325 | mode = UNIT(n)->manager->running_as == MANAGER_SYSTEM ? "system" : "user"; |
8f077bf9 | 326 | n->starter_fd = bus_kernel_open_bus_fd(mode, &path); |
23bbb0de | 327 | if (n->starter_fd < 0) |
f2341e0a | 328 | return log_unit_warning_errno(UNIT(n), n->starter_fd, "Failed to open %s: %m", path ?: "kdbus"); |
e821075a LP |
329 | |
330 | return 0; | |
331 | } | |
332 | ||
333 | static void busname_set_state(BusName *n, BusNameState state) { | |
334 | BusNameState old_state; | |
335 | assert(n); | |
336 | ||
337 | old_state = n->state; | |
338 | n->state = state; | |
339 | ||
a4152e3f LP |
340 | if (!IN_SET(state, BUSNAME_MAKING, BUSNAME_SIGTERM, BUSNAME_SIGKILL)) { |
341 | n->timer_event_source = sd_event_source_unref(n->timer_event_source); | |
342 | busname_unwatch_control_pid(n); | |
343 | } | |
344 | ||
e821075a LP |
345 | if (state != BUSNAME_LISTENING) |
346 | busname_unwatch_fd(n); | |
347 | ||
a4152e3f | 348 | if (!IN_SET(state, BUSNAME_LISTENING, BUSNAME_MAKING, BUSNAME_REGISTERED, BUSNAME_RUNNING)) |
e821075a LP |
349 | busname_close_fd(n); |
350 | ||
351 | if (state != old_state) | |
f2341e0a | 352 | log_unit_debug(UNIT(n), "Changed %s -> %s", busname_state_to_string(old_state), busname_state_to_string(state)); |
e821075a LP |
353 | |
354 | unit_notify(UNIT(n), state_translation_table[old_state], state_translation_table[state], true); | |
355 | } | |
356 | ||
be847e82 | 357 | static int busname_coldplug(Unit *u) { |
e821075a LP |
358 | BusName *n = BUSNAME(u); |
359 | int r; | |
360 | ||
361 | assert(n); | |
362 | assert(n->state == BUSNAME_DEAD); | |
363 | ||
364 | if (n->deserialized_state == n->state) | |
365 | return 0; | |
366 | ||
a4152e3f LP |
367 | if (IN_SET(n->deserialized_state, BUSNAME_MAKING, BUSNAME_SIGTERM, BUSNAME_SIGKILL)) { |
368 | ||
369 | if (n->control_pid <= 0) | |
370 | return -EBADMSG; | |
371 | ||
372 | r = unit_watch_pid(UNIT(n), n->control_pid); | |
373 | if (r < 0) | |
374 | return r; | |
375 | ||
376 | r = busname_arm_timer(n); | |
377 | if (r < 0) | |
378 | return r; | |
379 | } | |
380 | ||
381 | if (IN_SET(n->deserialized_state, BUSNAME_MAKING, BUSNAME_LISTENING, BUSNAME_REGISTERED, BUSNAME_RUNNING)) { | |
e821075a LP |
382 | r = busname_open_fd(n); |
383 | if (r < 0) | |
384 | return r; | |
385 | } | |
386 | ||
387 | if (n->deserialized_state == BUSNAME_LISTENING) { | |
388 | r = busname_watch_fd(n); | |
389 | if (r < 0) | |
390 | return r; | |
391 | } | |
392 | ||
393 | busname_set_state(n, n->deserialized_state); | |
394 | return 0; | |
395 | } | |
396 | ||
a4152e3f LP |
397 | static int busname_make_starter(BusName *n, pid_t *_pid) { |
398 | pid_t pid; | |
399 | int r; | |
400 | ||
401 | r = busname_arm_timer(n); | |
402 | if (r < 0) | |
403 | goto fail; | |
404 | ||
405 | /* We have to resolve the user/group names out-of-process, | |
406 | * hence let's fork here. It's messy, but well, what can we | |
407 | * do? */ | |
408 | ||
409 | pid = fork(); | |
410 | if (pid < 0) | |
411 | return -errno; | |
412 | ||
413 | if (pid == 0) { | |
414 | int ret; | |
415 | ||
ce30c8dc LP |
416 | (void) default_signals(SIGNALS_CRASH_HANDLER, SIGNALS_IGNORE, -1); |
417 | (void) ignore_signals(SIGPIPE, -1); | |
a4152e3f LP |
418 | log_forget_fds(); |
419 | ||
420 | r = bus_kernel_make_starter(n->starter_fd, n->name, n->activating, n->accept_fd, n->policy, n->policy_world); | |
421 | if (r < 0) { | |
422 | ret = EXIT_MAKE_STARTER; | |
423 | goto fail_child; | |
424 | } | |
425 | ||
426 | _exit(0); | |
427 | ||
428 | fail_child: | |
429 | log_open(); | |
da927ba9 | 430 | log_error_errno(r, "Failed to create starter connection at step %s: %m", exit_status_to_string(ret, EXIT_STATUS_SYSTEMD)); |
a4152e3f LP |
431 | |
432 | _exit(ret); | |
433 | } | |
434 | ||
435 | r = unit_watch_pid(UNIT(n), pid); | |
436 | if (r < 0) | |
437 | goto fail; | |
438 | ||
439 | *_pid = pid; | |
440 | return 0; | |
441 | ||
442 | fail: | |
443 | n->timer_event_source = sd_event_source_unref(n->timer_event_source); | |
444 | return r; | |
445 | } | |
446 | ||
e821075a LP |
447 | static void busname_enter_dead(BusName *n, BusNameResult f) { |
448 | assert(n); | |
449 | ||
450 | if (f != BUSNAME_SUCCESS) | |
451 | n->result = f; | |
452 | ||
453 | busname_set_state(n, n->result != BUSNAME_SUCCESS ? BUSNAME_FAILED : BUSNAME_DEAD); | |
454 | } | |
455 | ||
a4152e3f LP |
456 | static void busname_enter_signal(BusName *n, BusNameState state, BusNameResult f) { |
457 | KillContext kill_context = {}; | |
e821075a LP |
458 | int r; |
459 | ||
460 | assert(n); | |
461 | ||
a4152e3f LP |
462 | if (f != BUSNAME_SUCCESS) |
463 | n->result = f; | |
464 | ||
465 | kill_context_init(&kill_context); | |
466 | ||
467 | r = unit_kill_context(UNIT(n), | |
468 | &kill_context, | |
db2cb23b | 469 | state != BUSNAME_SIGTERM ? KILL_KILL : KILL_TERMINATE, |
a4152e3f LP |
470 | -1, |
471 | n->control_pid, | |
472 | false); | |
e821075a | 473 | if (r < 0) { |
f2341e0a | 474 | log_unit_warning_errno(UNIT(n), r, "Failed to kill control process: %m"); |
e821075a LP |
475 | goto fail; |
476 | } | |
477 | ||
a4152e3f LP |
478 | if (r > 0) { |
479 | r = busname_arm_timer(n); | |
480 | if (r < 0) { | |
f2341e0a | 481 | log_unit_warning_errno(UNIT(n), r, "Failed to arm timer: %m"); |
a4152e3f LP |
482 | goto fail; |
483 | } | |
484 | ||
485 | busname_set_state(n, state); | |
486 | } else if (state == BUSNAME_SIGTERM) | |
487 | busname_enter_signal(n, BUSNAME_SIGKILL, BUSNAME_SUCCESS); | |
488 | else | |
489 | busname_enter_dead(n, BUSNAME_SUCCESS); | |
490 | ||
491 | return; | |
492 | ||
493 | fail: | |
494 | busname_enter_dead(n, BUSNAME_FAILURE_RESOURCES); | |
495 | } | |
496 | ||
497 | static void busname_enter_listening(BusName *n) { | |
498 | int r; | |
499 | ||
500 | assert(n); | |
501 | ||
5892a914 DM |
502 | if (n->activating) { |
503 | r = busname_watch_fd(n); | |
504 | if (r < 0) { | |
f2341e0a | 505 | log_unit_warning_errno(UNIT(n), r, "Failed to watch names: %m"); |
5892a914 DM |
506 | goto fail; |
507 | } | |
508 | ||
509 | busname_set_state(n, BUSNAME_LISTENING); | |
510 | } else | |
511 | busname_set_state(n, BUSNAME_REGISTERED); | |
e821075a | 512 | |
e821075a LP |
513 | return; |
514 | ||
a4152e3f LP |
515 | fail: |
516 | busname_enter_signal(n, BUSNAME_SIGTERM, BUSNAME_FAILURE_RESOURCES); | |
517 | } | |
518 | ||
519 | static void busname_enter_making(BusName *n) { | |
520 | int r; | |
521 | ||
522 | assert(n); | |
523 | ||
524 | r = busname_open_fd(n); | |
525 | if (r < 0) | |
526 | goto fail; | |
527 | ||
528 | if (n->policy) { | |
8d0e0ddd | 529 | /* If there is a policy, we need to resolve user/group |
a4152e3f LP |
530 | * names, which we can't do from PID1, hence let's |
531 | * fork. */ | |
532 | busname_unwatch_control_pid(n); | |
533 | ||
534 | r = busname_make_starter(n, &n->control_pid); | |
535 | if (r < 0) { | |
f2341e0a | 536 | log_unit_warning_errno(UNIT(n), r, "Failed to fork 'making' task: %m"); |
a4152e3f LP |
537 | goto fail; |
538 | } | |
539 | ||
540 | busname_set_state(n, BUSNAME_MAKING); | |
541 | } else { | |
8d0e0ddd | 542 | /* If there is no policy, we can do everything |
a4152e3f LP |
543 | * directly from PID 1, hence do so. */ |
544 | ||
545 | r = bus_kernel_make_starter(n->starter_fd, n->name, n->activating, n->accept_fd, NULL, n->policy_world); | |
546 | if (r < 0) { | |
f2341e0a | 547 | log_unit_warning_errno(UNIT(n), r, "Failed to make starter: %m"); |
a4152e3f LP |
548 | goto fail; |
549 | } | |
550 | ||
551 | busname_enter_listening(n); | |
552 | } | |
553 | ||
554 | return; | |
555 | ||
e821075a LP |
556 | fail: |
557 | busname_enter_dead(n, BUSNAME_FAILURE_RESOURCES); | |
558 | } | |
559 | ||
560 | static void busname_enter_running(BusName *n) { | |
561 | _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; | |
562 | bool pending = false; | |
563 | Unit *other; | |
564 | Iterator i; | |
565 | int r; | |
566 | ||
567 | assert(n); | |
568 | ||
5892a914 DM |
569 | if (!n->activating) |
570 | return; | |
571 | ||
05a08cb6 | 572 | /* We don't take connections anymore if we are supposed to |
e821075a LP |
573 | * shut down anyway */ |
574 | ||
575 | if (unit_stop_pending(UNIT(n))) { | |
f2341e0a | 576 | log_unit_debug(UNIT(n), "Suppressing activation request since unit stop is scheduled."); |
16ac4014 LP |
577 | |
578 | /* Flush all queued activation reqeuest by closing and reopening the connection */ | |
ff975efb | 579 | bus_kernel_drop_one(n->starter_fd); |
16ac4014 | 580 | |
16ac4014 | 581 | busname_enter_listening(n); |
e821075a LP |
582 | return; |
583 | } | |
584 | ||
585 | /* If there's already a start pending don't bother to do | |
586 | * anything */ | |
587 | SET_FOREACH(other, UNIT(n)->dependencies[UNIT_TRIGGERS], i) | |
588 | if (unit_active_or_pending(other)) { | |
589 | pending = true; | |
590 | break; | |
591 | } | |
592 | ||
593 | if (!pending) { | |
995c5e96 LP |
594 | if (!UNIT_ISSET(n->service)) { |
595 | log_unit_error(UNIT(n), "Service to activate vanished, refusing activation."); | |
596 | r = -ENOENT; | |
597 | goto fail; | |
598 | } | |
599 | ||
e821075a LP |
600 | r = manager_add_job(UNIT(n)->manager, JOB_START, UNIT_DEREF(n->service), JOB_REPLACE, true, &error, NULL); |
601 | if (r < 0) | |
602 | goto fail; | |
603 | } | |
604 | ||
605 | busname_set_state(n, BUSNAME_RUNNING); | |
606 | return; | |
607 | ||
608 | fail: | |
f2341e0a | 609 | log_unit_warning(UNIT(n), "Failed to queue service startup job: %s", bus_error_message(&error, r)); |
e821075a LP |
610 | busname_enter_dead(n, BUSNAME_FAILURE_RESOURCES); |
611 | } | |
612 | ||
613 | static int busname_start(Unit *u) { | |
614 | BusName *n = BUSNAME(u); | |
615 | ||
616 | assert(n); | |
617 | ||
a4152e3f LP |
618 | /* We cannot fulfill this request right now, try again later |
619 | * please! */ | |
620 | if (IN_SET(n->state, BUSNAME_SIGTERM, BUSNAME_SIGKILL)) | |
621 | return -EAGAIN; | |
622 | ||
623 | /* Already on it! */ | |
624 | if (n->state == BUSNAME_MAKING) | |
625 | return 0; | |
626 | ||
5892a914 | 627 | if (n->activating && UNIT_ISSET(n->service)) { |
e821075a LP |
628 | Service *service; |
629 | ||
630 | service = SERVICE(UNIT_DEREF(n->service)); | |
631 | ||
632 | if (UNIT(service)->load_state != UNIT_LOADED) { | |
f2341e0a | 633 | log_unit_error(u, "Bus service %s not loaded, refusing.", UNIT(service)->id); |
e821075a LP |
634 | return -ENOENT; |
635 | } | |
636 | } | |
637 | ||
638 | assert(IN_SET(n->state, BUSNAME_DEAD, BUSNAME_FAILED)); | |
639 | ||
640 | n->result = BUSNAME_SUCCESS; | |
a4152e3f | 641 | busname_enter_making(n); |
e821075a | 642 | |
82a2b6bb | 643 | return 1; |
e821075a LP |
644 | } |
645 | ||
646 | static int busname_stop(Unit *u) { | |
647 | BusName *n = BUSNAME(u); | |
648 | ||
649 | assert(n); | |
a4152e3f LP |
650 | |
651 | /* Already on it */ | |
652 | if (IN_SET(n->state, BUSNAME_SIGTERM, BUSNAME_SIGKILL)) | |
653 | return 0; | |
654 | ||
655 | /* If there's already something running, we go directly into | |
656 | * kill mode. */ | |
657 | ||
658 | if (n->state == BUSNAME_MAKING) { | |
659 | busname_enter_signal(n, BUSNAME_SIGTERM, BUSNAME_SUCCESS); | |
660 | return -EAGAIN; | |
661 | } | |
662 | ||
5892a914 | 663 | assert(IN_SET(n->state, BUSNAME_REGISTERED, BUSNAME_LISTENING, BUSNAME_RUNNING)); |
e821075a LP |
664 | |
665 | busname_enter_dead(n, BUSNAME_SUCCESS); | |
82a2b6bb | 666 | return 1; |
e821075a LP |
667 | } |
668 | ||
669 | static int busname_serialize(Unit *u, FILE *f, FDSet *fds) { | |
670 | BusName *n = BUSNAME(u); | |
a34ceba6 | 671 | int r; |
e821075a LP |
672 | |
673 | assert(n); | |
674 | assert(f); | |
675 | assert(fds); | |
676 | ||
677 | unit_serialize_item(u, f, "state", busname_state_to_string(n->state)); | |
678 | unit_serialize_item(u, f, "result", busname_result_to_string(n->result)); | |
679 | ||
a4152e3f LP |
680 | if (n->control_pid > 0) |
681 | unit_serialize_item_format(u, f, "control-pid", PID_FMT, n->control_pid); | |
682 | ||
a34ceba6 LP |
683 | r = unit_serialize_item_fd(u, f, fds, "starter-fd", n->starter_fd); |
684 | if (r < 0) | |
685 | return r; | |
e821075a LP |
686 | |
687 | return 0; | |
688 | } | |
689 | ||
690 | static int busname_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { | |
691 | BusName *n = BUSNAME(u); | |
692 | ||
693 | assert(n); | |
694 | assert(key); | |
695 | assert(value); | |
696 | ||
697 | if (streq(key, "state")) { | |
698 | BusNameState state; | |
699 | ||
700 | state = busname_state_from_string(value); | |
701 | if (state < 0) | |
f2341e0a | 702 | log_unit_debug(u, "Failed to parse state value: %s", value); |
e821075a LP |
703 | else |
704 | n->deserialized_state = state; | |
705 | ||
706 | } else if (streq(key, "result")) { | |
707 | BusNameResult f; | |
708 | ||
709 | f = busname_result_from_string(value); | |
710 | if (f < 0) | |
f2341e0a | 711 | log_unit_debug(u, "Failed to parse result value: %s", value); |
e821075a LP |
712 | else if (f != BUSNAME_SUCCESS) |
713 | n->result = f; | |
714 | ||
a4152e3f LP |
715 | } else if (streq(key, "control-pid")) { |
716 | pid_t pid; | |
717 | ||
718 | if (parse_pid(value, &pid) < 0) | |
f2341e0a | 719 | log_unit_debug(u, "Failed to parse control-pid value: %s", value); |
a4152e3f LP |
720 | else |
721 | n->control_pid = pid; | |
e821075a LP |
722 | } else if (streq(key, "starter-fd")) { |
723 | int fd; | |
724 | ||
725 | if (safe_atoi(value, &fd) < 0 || fd < 0 || !fdset_contains(fds, fd)) | |
f2341e0a | 726 | log_unit_debug(u, "Failed to parse starter fd value: %s", value); |
e821075a | 727 | else { |
03e334a1 | 728 | safe_close(n->starter_fd); |
e821075a LP |
729 | n->starter_fd = fdset_remove(fds, fd); |
730 | } | |
731 | } else | |
f2341e0a | 732 | log_unit_debug(u, "Unknown serialization key: %s", key); |
e821075a LP |
733 | |
734 | return 0; | |
735 | } | |
736 | ||
737 | _pure_ static UnitActiveState busname_active_state(Unit *u) { | |
738 | assert(u); | |
739 | ||
740 | return state_translation_table[BUSNAME(u)->state]; | |
741 | } | |
742 | ||
743 | _pure_ static const char *busname_sub_state_to_string(Unit *u) { | |
744 | assert(u); | |
745 | ||
746 | return busname_state_to_string(BUSNAME(u)->state); | |
747 | } | |
748 | ||
bd5f920f LP |
749 | static int busname_peek_message(BusName *n) { |
750 | struct kdbus_cmd_recv cmd_recv = { | |
94e15fdc | 751 | .size = sizeof(cmd_recv), |
bd5f920f LP |
752 | .flags = KDBUS_RECV_PEEK, |
753 | }; | |
e24e415e DM |
754 | struct kdbus_cmd_free cmd_free = { |
755 | .size = sizeof(cmd_free), | |
756 | }; | |
bd5f920f LP |
757 | const char *comm = NULL; |
758 | struct kdbus_item *d; | |
759 | struct kdbus_msg *k; | |
760 | size_t start, ps, sz, delta; | |
761 | void *p = NULL; | |
762 | pid_t pid = 0; | |
763 | int r; | |
764 | ||
dcc2fc01 LP |
765 | /* Generate a friendly debug log message about which process |
766 | * caused triggering of this bus name. This simply peeks the | |
767 | * metadata of the first queued message and logs it. */ | |
768 | ||
bd5f920f LP |
769 | assert(n); |
770 | ||
dcc2fc01 LP |
771 | /* Let's shortcut things a bit, if debug logging is turned off |
772 | * anyway. */ | |
773 | ||
774 | if (log_get_max_level() < LOG_DEBUG) | |
775 | return 0; | |
bd5f920f | 776 | |
94e15fdc | 777 | r = ioctl(n->starter_fd, KDBUS_CMD_RECV, &cmd_recv); |
bd5f920f LP |
778 | if (r < 0) { |
779 | if (errno == EINTR || errno == EAGAIN) | |
780 | return 0; | |
781 | ||
f2341e0a | 782 | return log_unit_error_errno(UNIT(n), errno, "Failed to query activation message: %m"); |
bd5f920f LP |
783 | } |
784 | ||
785 | /* We map as late as possible, and unmap imemdiately after | |
786 | * use. On 32bit address space is scarce and we want to be | |
787 | * able to handle a lot of activator connections at the same | |
788 | * time, and hence shouldn't keep the mmap()s around for | |
789 | * longer than necessary. */ | |
790 | ||
791 | ps = page_size(); | |
a9c8343e DM |
792 | start = (cmd_recv.msg.offset / ps) * ps; |
793 | delta = cmd_recv.msg.offset - start; | |
794 | sz = PAGE_ALIGN(delta + cmd_recv.msg.msg_size); | |
bd5f920f LP |
795 | |
796 | p = mmap(NULL, sz, PROT_READ, MAP_SHARED, n->starter_fd, start); | |
797 | if (p == MAP_FAILED) { | |
f2341e0a | 798 | r = log_unit_error_errno(UNIT(n), errno, "Failed to map activation message: %m"); |
bd5f920f LP |
799 | goto finish; |
800 | } | |
801 | ||
802 | k = (struct kdbus_msg *) ((uint8_t *) p + delta); | |
803 | KDBUS_ITEM_FOREACH(d, k, items) { | |
804 | switch (d->type) { | |
805 | ||
806 | case KDBUS_ITEM_PIDS: | |
807 | pid = d->pids.pid; | |
808 | break; | |
809 | ||
810 | case KDBUS_ITEM_PID_COMM: | |
811 | comm = d->str; | |
812 | break; | |
813 | } | |
814 | } | |
815 | ||
816 | if (pid > 0) | |
f2341e0a | 817 | log_unit_debug(UNIT(n), "Activation triggered by process " PID_FMT " (%s)", pid, strna(comm)); |
bd5f920f LP |
818 | |
819 | r = 0; | |
820 | ||
821 | finish: | |
822 | if (p) | |
823 | (void) munmap(p, sz); | |
824 | ||
a9c8343e | 825 | cmd_free.offset = cmd_recv.msg.offset; |
dcc2fc01 | 826 | if (ioctl(n->starter_fd, KDBUS_CMD_FREE, &cmd_free) < 0) |
f2341e0a | 827 | log_unit_warning(UNIT(n), "Failed to free peeked message, ignoring: %m"); |
bd5f920f LP |
828 | |
829 | return r; | |
830 | } | |
831 | ||
e821075a LP |
832 | static int busname_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) { |
833 | BusName *n = userdata; | |
834 | ||
835 | assert(n); | |
836 | assert(fd >= 0); | |
837 | ||
838 | if (n->state != BUSNAME_LISTENING) | |
839 | return 0; | |
840 | ||
f2341e0a | 841 | log_unit_debug(UNIT(n), "Activation request"); |
e821075a LP |
842 | |
843 | if (revents != EPOLLIN) { | |
f2341e0a | 844 | log_unit_error(UNIT(n), "Got unexpected poll event (0x%x) on starter fd.", revents); |
e821075a LP |
845 | goto fail; |
846 | } | |
847 | ||
bd5f920f | 848 | busname_peek_message(n); |
e821075a LP |
849 | busname_enter_running(n); |
850 | return 0; | |
851 | fail: | |
852 | ||
853 | busname_enter_dead(n, BUSNAME_FAILURE_RESOURCES); | |
854 | return 0; | |
855 | } | |
856 | ||
a4152e3f LP |
857 | static void busname_sigchld_event(Unit *u, pid_t pid, int code, int status) { |
858 | BusName *n = BUSNAME(u); | |
859 | BusNameResult f; | |
860 | ||
861 | assert(n); | |
862 | assert(pid >= 0); | |
863 | ||
864 | if (pid != n->control_pid) | |
865 | return; | |
866 | ||
867 | n->control_pid = 0; | |
868 | ||
869 | if (is_clean_exit(code, status, NULL)) | |
870 | f = BUSNAME_SUCCESS; | |
871 | else if (code == CLD_EXITED) | |
872 | f = BUSNAME_FAILURE_EXIT_CODE; | |
873 | else if (code == CLD_KILLED) | |
874 | f = BUSNAME_FAILURE_SIGNAL; | |
deffddf1 | 875 | else if (code == CLD_DUMPED) |
a4152e3f LP |
876 | f = BUSNAME_FAILURE_CORE_DUMP; |
877 | else | |
878 | assert_not_reached("Unknown sigchld code"); | |
879 | ||
f2341e0a LP |
880 | log_unit_full(u, f == BUSNAME_SUCCESS ? LOG_DEBUG : LOG_NOTICE, 0, |
881 | "Control process exited, code=%s status=%i", sigchld_code_to_string(code), status); | |
a4152e3f LP |
882 | |
883 | if (f != BUSNAME_SUCCESS) | |
884 | n->result = f; | |
885 | ||
886 | switch (n->state) { | |
887 | ||
888 | case BUSNAME_MAKING: | |
889 | if (f == BUSNAME_SUCCESS) | |
890 | busname_enter_listening(n); | |
891 | else | |
892 | busname_enter_signal(n, BUSNAME_SIGTERM, f); | |
893 | break; | |
894 | ||
895 | case BUSNAME_SIGTERM: | |
896 | case BUSNAME_SIGKILL: | |
897 | busname_enter_dead(n, f); | |
898 | break; | |
899 | ||
900 | default: | |
901 | assert_not_reached("Uh, control process died at wrong time."); | |
902 | } | |
903 | ||
904 | /* Notify clients about changed exit status */ | |
905 | unit_add_to_dbus_queue(u); | |
906 | } | |
907 | ||
908 | static int busname_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) { | |
909 | BusName *n = BUSNAME(userdata); | |
910 | ||
911 | assert(n); | |
912 | assert(n->timer_event_source == source); | |
913 | ||
914 | switch (n->state) { | |
915 | ||
916 | case BUSNAME_MAKING: | |
f2341e0a | 917 | log_unit_warning(UNIT(n), "Making timed out. Terminating."); |
a4152e3f LP |
918 | busname_enter_signal(n, BUSNAME_SIGTERM, BUSNAME_FAILURE_TIMEOUT); |
919 | break; | |
920 | ||
921 | case BUSNAME_SIGTERM: | |
f2341e0a | 922 | log_unit_warning(UNIT(n), "Stopping timed out. Killing."); |
a4152e3f LP |
923 | busname_enter_signal(n, BUSNAME_SIGKILL, BUSNAME_FAILURE_TIMEOUT); |
924 | break; | |
925 | ||
926 | case BUSNAME_SIGKILL: | |
f2341e0a | 927 | log_unit_warning(UNIT(n), "Processes still around after SIGKILL. Ignoring."); |
a4152e3f LP |
928 | busname_enter_dead(n, BUSNAME_FAILURE_TIMEOUT); |
929 | break; | |
930 | ||
931 | default: | |
932 | assert_not_reached("Timeout at wrong time."); | |
933 | } | |
934 | ||
935 | return 0; | |
936 | } | |
937 | ||
e821075a LP |
938 | static void busname_reset_failed(Unit *u) { |
939 | BusName *n = BUSNAME(u); | |
940 | ||
941 | assert(n); | |
942 | ||
943 | if (n->state == BUSNAME_FAILED) | |
944 | busname_set_state(n, BUSNAME_DEAD); | |
945 | ||
946 | n->result = BUSNAME_SUCCESS; | |
947 | } | |
948 | ||
949 | static void busname_trigger_notify(Unit *u, Unit *other) { | |
950 | BusName *n = BUSNAME(u); | |
951 | Service *s; | |
952 | ||
953 | assert(n); | |
954 | assert(other); | |
955 | ||
956 | if (!IN_SET(n->state, BUSNAME_RUNNING, BUSNAME_LISTENING)) | |
957 | return; | |
958 | ||
959 | if (other->load_state != UNIT_LOADED || other->type != UNIT_SERVICE) | |
960 | return; | |
961 | ||
962 | s = SERVICE(other); | |
963 | ||
2f671520 LP |
964 | if (s->state == SERVICE_FAILED && s->result == SERVICE_FAILURE_START_LIMIT) |
965 | busname_enter_dead(n, BUSNAME_FAILURE_SERVICE_FAILED_PERMANENT); | |
966 | else if (IN_SET(s->state, | |
967 | SERVICE_DEAD, SERVICE_FAILED, | |
968 | SERVICE_STOP, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL, | |
969 | SERVICE_STOP_POST, SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL, | |
970 | SERVICE_AUTO_RESTART)) | |
e821075a LP |
971 | busname_enter_listening(n); |
972 | } | |
973 | ||
a4152e3f LP |
974 | static int busname_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) { |
975 | return unit_kill_common(u, who, signo, -1, BUSNAME(u)->control_pid, error); | |
976 | } | |
977 | ||
978 | static int busname_get_timeout(Unit *u, uint64_t *timeout) { | |
979 | BusName *n = BUSNAME(u); | |
980 | int r; | |
981 | ||
982 | if (!n->timer_event_source) | |
983 | return 0; | |
984 | ||
985 | r = sd_event_source_get_time(n->timer_event_source, timeout); | |
986 | if (r < 0) | |
987 | return r; | |
988 | ||
989 | return 1; | |
990 | } | |
991 | ||
1c2e9646 | 992 | static bool busname_supported(void) { |
d69a7cea | 993 | static int supported = -1; |
0faacd47 LP |
994 | |
995 | if (supported < 0) | |
d79acc30 | 996 | supported = is_kdbus_available(); |
0faacd47 LP |
997 | |
998 | return supported; | |
999 | } | |
1000 | ||
e821075a LP |
1001 | static const char* const busname_result_table[_BUSNAME_RESULT_MAX] = { |
1002 | [BUSNAME_SUCCESS] = "success", | |
1003 | [BUSNAME_FAILURE_RESOURCES] = "resources", | |
a4152e3f LP |
1004 | [BUSNAME_FAILURE_TIMEOUT] = "timeout", |
1005 | [BUSNAME_FAILURE_EXIT_CODE] = "exit-code", | |
1006 | [BUSNAME_FAILURE_SIGNAL] = "signal", | |
1007 | [BUSNAME_FAILURE_CORE_DUMP] = "core-dump", | |
700ff4d9 | 1008 | [BUSNAME_FAILURE_SERVICE_FAILED_PERMANENT] = "service-failed-permanent", |
e821075a LP |
1009 | }; |
1010 | ||
1011 | DEFINE_STRING_TABLE_LOOKUP(busname_result, BusNameResult); | |
1012 | ||
1013 | const UnitVTable busname_vtable = { | |
1014 | .object_size = sizeof(BusName), | |
1015 | ||
1016 | .sections = | |
1017 | "Unit\0" | |
1018 | "BusName\0" | |
1019 | "Install\0", | |
1020 | .private_section = "BusName", | |
1021 | ||
e05ad7bc LP |
1022 | .no_alias = true, |
1023 | .no_instances = true, | |
1024 | ||
e821075a LP |
1025 | .init = busname_init, |
1026 | .done = busname_done, | |
1027 | .load = busname_load, | |
1028 | ||
1029 | .coldplug = busname_coldplug, | |
1030 | ||
1031 | .dump = busname_dump, | |
1032 | ||
1033 | .start = busname_start, | |
1034 | .stop = busname_stop, | |
1035 | ||
a4152e3f LP |
1036 | .kill = busname_kill, |
1037 | ||
1038 | .get_timeout = busname_get_timeout, | |
1039 | ||
e821075a LP |
1040 | .serialize = busname_serialize, |
1041 | .deserialize_item = busname_deserialize_item, | |
1042 | ||
1043 | .active_state = busname_active_state, | |
1044 | .sub_state_to_string = busname_sub_state_to_string, | |
1045 | ||
a4152e3f LP |
1046 | .sigchld_event = busname_sigchld_event, |
1047 | ||
e821075a LP |
1048 | .trigger_notify = busname_trigger_notify, |
1049 | ||
1050 | .reset_failed = busname_reset_failed, | |
1051 | ||
0faacd47 LP |
1052 | .supported = busname_supported, |
1053 | ||
e821075a | 1054 | .bus_vtable = bus_busname_vtable, |
e821075a LP |
1055 | |
1056 | .status_message_formats = { | |
1057 | .finished_start_job = { | |
1058 | [JOB_DONE] = "Listening on %s.", | |
1059 | [JOB_FAILED] = "Failed to listen on %s.", | |
e821075a LP |
1060 | }, |
1061 | .finished_stop_job = { | |
1062 | [JOB_DONE] = "Closed %s.", | |
1063 | [JOB_FAILED] = "Failed stopping %s.", | |
e821075a LP |
1064 | }, |
1065 | }, | |
1066 | }; |