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Commit | Line | Data |
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e821075a LP |
1 | /*** |
2 | This file is part of systemd. | |
3 | ||
4 | Copyright 2013 Lennart Poettering | |
5 | ||
6 | systemd is free software; you can redistribute it and/or modify it | |
7 | under the terms of the GNU Lesser General Public License as published by | |
8 | the Free Software Foundation; either version 2.1 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | systemd is distributed in the hope that it will be useful, but | |
12 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public License | |
17 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
18 | ***/ | |
19 | ||
bd5f920f LP |
20 | #include <sys/mman.h> |
21 | ||
b5efdb8a | 22 | #include "alloc-util.h" |
e821075a | 23 | #include "bus-internal.h" |
07630cea LP |
24 | #include "bus-kernel.h" |
25 | #include "bus-policy.h" | |
e821075a | 26 | #include "bus-util.h" |
3ffd4af2 | 27 | #include "busname.h" |
07630cea | 28 | #include "dbus-busname.h" |
3ffd4af2 | 29 | #include "fd-util.h" |
07630cea | 30 | #include "formats-util.h" |
3c70e3bb | 31 | #include "kdbus.h" |
6bedfcbb | 32 | #include "parse-util.h" |
7b3e062c | 33 | #include "process-util.h" |
24882e06 | 34 | #include "service.h" |
07630cea LP |
35 | #include "signal-util.h" |
36 | #include "special.h" | |
8b43440b | 37 | #include "string-table.h" |
07630cea | 38 | #include "string-util.h" |
e821075a LP |
39 | |
40 | static const UnitActiveState state_translation_table[_BUSNAME_STATE_MAX] = { | |
41 | [BUSNAME_DEAD] = UNIT_INACTIVE, | |
a4152e3f | 42 | [BUSNAME_MAKING] = UNIT_ACTIVATING, |
5892a914 | 43 | [BUSNAME_REGISTERED] = UNIT_ACTIVE, |
e821075a LP |
44 | [BUSNAME_LISTENING] = UNIT_ACTIVE, |
45 | [BUSNAME_RUNNING] = UNIT_ACTIVE, | |
a4152e3f LP |
46 | [BUSNAME_SIGTERM] = UNIT_DEACTIVATING, |
47 | [BUSNAME_SIGKILL] = UNIT_DEACTIVATING, | |
e821075a LP |
48 | [BUSNAME_FAILED] = UNIT_FAILED |
49 | }; | |
50 | ||
51 | static int busname_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata); | |
a4152e3f | 52 | static int busname_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata); |
e821075a LP |
53 | |
54 | static void busname_init(Unit *u) { | |
55 | BusName *n = BUSNAME(u); | |
56 | ||
57 | assert(u); | |
58 | assert(u->load_state == UNIT_STUB); | |
59 | ||
60 | n->starter_fd = -1; | |
3f9da416 | 61 | n->accept_fd = true; |
4f101180 | 62 | n->activating = true; |
a4152e3f LP |
63 | |
64 | n->timeout_usec = u->manager->default_timeout_start_usec; | |
65 | } | |
66 | ||
67 | static void busname_unwatch_control_pid(BusName *n) { | |
68 | assert(n); | |
69 | ||
70 | if (n->control_pid <= 0) | |
71 | return; | |
72 | ||
73 | unit_unwatch_pid(UNIT(n), n->control_pid); | |
74 | n->control_pid = 0; | |
75 | } | |
76 | ||
77 | static void busname_free_policy(BusName *n) { | |
78 | BusNamePolicy *p; | |
79 | ||
80 | assert(n); | |
81 | ||
82 | while ((p = n->policy)) { | |
83 | LIST_REMOVE(policy, n->policy, p); | |
84 | ||
85 | free(p->name); | |
86 | free(p); | |
87 | } | |
88 | } | |
89 | ||
90 | static void busname_close_fd(BusName *n) { | |
91 | assert(n); | |
92 | ||
93 | n->starter_event_source = sd_event_source_unref(n->starter_event_source); | |
94 | n->starter_fd = safe_close(n->starter_fd); | |
e821075a LP |
95 | } |
96 | ||
97 | static void busname_done(Unit *u) { | |
98 | BusName *n = BUSNAME(u); | |
99 | ||
a4152e3f | 100 | assert(n); |
e821075a | 101 | |
a1e58e8e | 102 | n->name = mfree(n->name); |
e821075a | 103 | |
a4152e3f LP |
104 | busname_free_policy(n); |
105 | busname_unwatch_control_pid(n); | |
106 | busname_close_fd(n); | |
107 | ||
e821075a LP |
108 | unit_ref_unset(&n->service); |
109 | ||
a4152e3f LP |
110 | n->timer_event_source = sd_event_source_unref(n->timer_event_source); |
111 | } | |
112 | ||
36c16a7c | 113 | static int busname_arm_timer(BusName *n, usec_t usec) { |
a4152e3f LP |
114 | int r; |
115 | ||
116 | assert(n); | |
117 | ||
a4152e3f | 118 | if (n->timer_event_source) { |
36c16a7c | 119 | r = sd_event_source_set_time(n->timer_event_source, usec); |
a4152e3f LP |
120 | if (r < 0) |
121 | return r; | |
122 | ||
123 | return sd_event_source_set_enabled(n->timer_event_source, SD_EVENT_ONESHOT); | |
124 | } | |
125 | ||
36c16a7c LP |
126 | if (usec == USEC_INFINITY) |
127 | return 0; | |
128 | ||
920b52e4 | 129 | r = sd_event_add_time( |
a4152e3f LP |
130 | UNIT(n)->manager->event, |
131 | &n->timer_event_source, | |
132 | CLOCK_MONOTONIC, | |
36c16a7c | 133 | usec, 0, |
a4152e3f | 134 | busname_dispatch_timer, n); |
7dfbe2e3 TG |
135 | if (r < 0) |
136 | return r; | |
137 | ||
138 | (void) sd_event_source_set_description(n->timer_event_source, "busname-timer"); | |
139 | ||
140 | return 0; | |
e821075a LP |
141 | } |
142 | ||
143 | static int busname_add_default_default_dependencies(BusName *n) { | |
144 | int r; | |
145 | ||
146 | assert(n); | |
147 | ||
148 | r = unit_add_dependency_by_name(UNIT(n), UNIT_BEFORE, SPECIAL_BUSNAMES_TARGET, NULL, true); | |
149 | if (r < 0) | |
150 | return r; | |
151 | ||
463d0d15 | 152 | if (MANAGER_IS_SYSTEM(UNIT(n)->manager)) { |
e821075a LP |
153 | r = unit_add_two_dependencies_by_name(UNIT(n), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SYSINIT_TARGET, NULL, true); |
154 | if (r < 0) | |
155 | return r; | |
156 | } | |
157 | ||
158 | return unit_add_two_dependencies_by_name(UNIT(n), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, NULL, true); | |
159 | } | |
160 | ||
161 | static int busname_add_extras(BusName *n) { | |
162 | Unit *u = UNIT(n); | |
163 | int r; | |
164 | ||
165 | assert(n); | |
166 | ||
167 | if (!n->name) { | |
7410616c LP |
168 | r = unit_name_to_prefix(u->id, &n->name); |
169 | if (r < 0) | |
170 | return r; | |
e821075a LP |
171 | } |
172 | ||
173 | if (!u->description) { | |
174 | r = unit_set_description(u, n->name); | |
175 | if (r < 0) | |
176 | return r; | |
177 | } | |
178 | ||
5892a914 DM |
179 | if (n->activating) { |
180 | if (!UNIT_DEREF(n->service)) { | |
181 | Unit *x; | |
e821075a | 182 | |
5892a914 DM |
183 | r = unit_load_related_unit(u, ".service", &x); |
184 | if (r < 0) | |
185 | return r; | |
186 | ||
187 | unit_ref_set(&n->service, x); | |
188 | } | |
189 | ||
190 | r = unit_add_two_dependencies(u, UNIT_BEFORE, UNIT_TRIGGERS, UNIT_DEREF(n->service), true); | |
e821075a LP |
191 | if (r < 0) |
192 | return r; | |
e821075a LP |
193 | } |
194 | ||
e821075a LP |
195 | if (u->default_dependencies) { |
196 | r = busname_add_default_default_dependencies(n); | |
197 | if (r < 0) | |
198 | return r; | |
199 | } | |
200 | ||
201 | return 0; | |
202 | } | |
203 | ||
e821075a LP |
204 | static int busname_verify(BusName *n) { |
205 | char *e; | |
206 | ||
207 | assert(n); | |
208 | ||
209 | if (UNIT(n)->load_state != UNIT_LOADED) | |
210 | return 0; | |
211 | ||
212 | if (!service_name_is_valid(n->name)) { | |
f2341e0a | 213 | log_unit_error(UNIT(n), "Name= setting is not a valid service name Refusing."); |
e821075a LP |
214 | return -EINVAL; |
215 | } | |
216 | ||
63c372cb | 217 | e = strjoina(n->name, ".busname"); |
e821075a | 218 | if (!unit_has_name(UNIT(n), e)) { |
f2341e0a | 219 | log_unit_error(UNIT(n), "Name= setting doesn't match unit name. Refusing."); |
e821075a LP |
220 | return -EINVAL; |
221 | } | |
222 | ||
223 | return 0; | |
224 | } | |
225 | ||
226 | static int busname_load(Unit *u) { | |
227 | BusName *n = BUSNAME(u); | |
228 | int r; | |
229 | ||
230 | assert(u); | |
231 | assert(u->load_state == UNIT_STUB); | |
232 | ||
233 | r = unit_load_fragment_and_dropin(u); | |
234 | if (r < 0) | |
235 | return r; | |
236 | ||
237 | if (u->load_state == UNIT_LOADED) { | |
238 | /* This is a new unit? Then let's add in some extras */ | |
239 | r = busname_add_extras(n); | |
240 | if (r < 0) | |
241 | return r; | |
242 | } | |
243 | ||
244 | return busname_verify(n); | |
245 | } | |
246 | ||
247 | static void busname_dump(Unit *u, FILE *f, const char *prefix) { | |
248 | BusName *n = BUSNAME(u); | |
249 | ||
250 | assert(n); | |
251 | assert(f); | |
252 | ||
253 | fprintf(f, | |
254 | "%sBus Name State: %s\n" | |
255 | "%sResult: %s\n" | |
3f9da416 | 256 | "%sName: %s\n" |
5892a914 | 257 | "%sActivating: %s\n" |
3f9da416 | 258 | "%sAccept FD: %s\n", |
e821075a LP |
259 | prefix, busname_state_to_string(n->state), |
260 | prefix, busname_result_to_string(n->result), | |
3f9da416 | 261 | prefix, n->name, |
5892a914 | 262 | prefix, yes_no(n->activating), |
3f9da416 | 263 | prefix, yes_no(n->accept_fd)); |
a4152e3f LP |
264 | |
265 | if (n->control_pid > 0) | |
266 | fprintf(f, | |
267 | "%sControl PID: "PID_FMT"\n", | |
268 | prefix, n->control_pid); | |
e821075a LP |
269 | } |
270 | ||
271 | static void busname_unwatch_fd(BusName *n) { | |
272 | int r; | |
273 | ||
274 | assert(n); | |
275 | ||
a4152e3f | 276 | if (!n->starter_event_source) |
e821075a LP |
277 | return; |
278 | ||
a4152e3f LP |
279 | r = sd_event_source_set_enabled(n->starter_event_source, SD_EVENT_OFF); |
280 | if (r < 0) | |
f2341e0a | 281 | log_unit_debug_errno(UNIT(n), r, "Failed to disable event source: %m"); |
e821075a LP |
282 | } |
283 | ||
284 | static int busname_watch_fd(BusName *n) { | |
285 | int r; | |
286 | ||
287 | assert(n); | |
288 | ||
289 | if (n->starter_fd < 0) | |
290 | return 0; | |
291 | ||
cbf60d0a | 292 | if (n->starter_event_source) { |
a4152e3f | 293 | r = sd_event_source_set_enabled(n->starter_event_source, SD_EVENT_ON); |
cbf60d0a LP |
294 | if (r < 0) |
295 | goto fail; | |
296 | } else { | |
a4152e3f | 297 | r = sd_event_add_io(UNIT(n)->manager->event, &n->starter_event_source, n->starter_fd, EPOLLIN, busname_dispatch_io, n); |
cbf60d0a LP |
298 | if (r < 0) |
299 | goto fail; | |
cfa9677b | 300 | |
cbf60d0a | 301 | (void) sd_event_source_set_description(n->starter_event_source, "busname-starter"); |
e821075a LP |
302 | } |
303 | ||
304 | return 0; | |
cbf60d0a LP |
305 | |
306 | fail: | |
307 | log_unit_warning_errno(UNIT(n), r, "Failed to watch starter fd: %m"); | |
308 | busname_unwatch_fd(n); | |
309 | return r; | |
e821075a LP |
310 | } |
311 | ||
312 | static int busname_open_fd(BusName *n) { | |
8f077bf9 ZJS |
313 | _cleanup_free_ char *path = NULL; |
314 | const char *mode; | |
315 | ||
e821075a LP |
316 | assert(n); |
317 | ||
318 | if (n->starter_fd >= 0) | |
319 | return 0; | |
320 | ||
463d0d15 | 321 | mode = MANAGER_IS_SYSTEM(UNIT(n)->manager) ? "system" : "user"; |
8f077bf9 | 322 | n->starter_fd = bus_kernel_open_bus_fd(mode, &path); |
23bbb0de | 323 | if (n->starter_fd < 0) |
f2341e0a | 324 | return log_unit_warning_errno(UNIT(n), n->starter_fd, "Failed to open %s: %m", path ?: "kdbus"); |
e821075a LP |
325 | |
326 | return 0; | |
327 | } | |
328 | ||
329 | static void busname_set_state(BusName *n, BusNameState state) { | |
330 | BusNameState old_state; | |
331 | assert(n); | |
332 | ||
333 | old_state = n->state; | |
334 | n->state = state; | |
335 | ||
a4152e3f LP |
336 | if (!IN_SET(state, BUSNAME_MAKING, BUSNAME_SIGTERM, BUSNAME_SIGKILL)) { |
337 | n->timer_event_source = sd_event_source_unref(n->timer_event_source); | |
338 | busname_unwatch_control_pid(n); | |
339 | } | |
340 | ||
e821075a LP |
341 | if (state != BUSNAME_LISTENING) |
342 | busname_unwatch_fd(n); | |
343 | ||
a4152e3f | 344 | if (!IN_SET(state, BUSNAME_LISTENING, BUSNAME_MAKING, BUSNAME_REGISTERED, BUSNAME_RUNNING)) |
e821075a LP |
345 | busname_close_fd(n); |
346 | ||
347 | if (state != old_state) | |
f2341e0a | 348 | log_unit_debug(UNIT(n), "Changed %s -> %s", busname_state_to_string(old_state), busname_state_to_string(state)); |
e821075a LP |
349 | |
350 | unit_notify(UNIT(n), state_translation_table[old_state], state_translation_table[state], true); | |
351 | } | |
352 | ||
be847e82 | 353 | static int busname_coldplug(Unit *u) { |
e821075a LP |
354 | BusName *n = BUSNAME(u); |
355 | int r; | |
356 | ||
357 | assert(n); | |
358 | assert(n->state == BUSNAME_DEAD); | |
359 | ||
360 | if (n->deserialized_state == n->state) | |
361 | return 0; | |
362 | ||
c386f588 LP |
363 | if (n->control_pid > 0 && |
364 | pid_is_unwaited(n->control_pid) && | |
365 | IN_SET(n->deserialized_state, BUSNAME_MAKING, BUSNAME_SIGTERM, BUSNAME_SIGKILL)) { | |
a4152e3f LP |
366 | |
367 | r = unit_watch_pid(UNIT(n), n->control_pid); | |
368 | if (r < 0) | |
369 | return r; | |
370 | ||
36c16a7c | 371 | r = busname_arm_timer(n, usec_add(u->state_change_timestamp.monotonic, n->timeout_usec)); |
a4152e3f LP |
372 | if (r < 0) |
373 | return r; | |
374 | } | |
375 | ||
376 | if (IN_SET(n->deserialized_state, BUSNAME_MAKING, BUSNAME_LISTENING, BUSNAME_REGISTERED, BUSNAME_RUNNING)) { | |
e821075a LP |
377 | r = busname_open_fd(n); |
378 | if (r < 0) | |
379 | return r; | |
380 | } | |
381 | ||
382 | if (n->deserialized_state == BUSNAME_LISTENING) { | |
383 | r = busname_watch_fd(n); | |
384 | if (r < 0) | |
385 | return r; | |
386 | } | |
387 | ||
388 | busname_set_state(n, n->deserialized_state); | |
389 | return 0; | |
390 | } | |
391 | ||
a4152e3f LP |
392 | static int busname_make_starter(BusName *n, pid_t *_pid) { |
393 | pid_t pid; | |
394 | int r; | |
395 | ||
36c16a7c | 396 | r = busname_arm_timer(n, usec_add(now(CLOCK_MONOTONIC), n->timeout_usec)); |
a4152e3f LP |
397 | if (r < 0) |
398 | goto fail; | |
399 | ||
400 | /* We have to resolve the user/group names out-of-process, | |
401 | * hence let's fork here. It's messy, but well, what can we | |
402 | * do? */ | |
403 | ||
404 | pid = fork(); | |
405 | if (pid < 0) | |
406 | return -errno; | |
407 | ||
408 | if (pid == 0) { | |
409 | int ret; | |
410 | ||
ce30c8dc LP |
411 | (void) default_signals(SIGNALS_CRASH_HANDLER, SIGNALS_IGNORE, -1); |
412 | (void) ignore_signals(SIGPIPE, -1); | |
a4152e3f LP |
413 | log_forget_fds(); |
414 | ||
415 | r = bus_kernel_make_starter(n->starter_fd, n->name, n->activating, n->accept_fd, n->policy, n->policy_world); | |
416 | if (r < 0) { | |
417 | ret = EXIT_MAKE_STARTER; | |
418 | goto fail_child; | |
419 | } | |
420 | ||
421 | _exit(0); | |
422 | ||
423 | fail_child: | |
424 | log_open(); | |
da927ba9 | 425 | log_error_errno(r, "Failed to create starter connection at step %s: %m", exit_status_to_string(ret, EXIT_STATUS_SYSTEMD)); |
a4152e3f LP |
426 | |
427 | _exit(ret); | |
428 | } | |
429 | ||
430 | r = unit_watch_pid(UNIT(n), pid); | |
431 | if (r < 0) | |
432 | goto fail; | |
433 | ||
434 | *_pid = pid; | |
435 | return 0; | |
436 | ||
437 | fail: | |
438 | n->timer_event_source = sd_event_source_unref(n->timer_event_source); | |
439 | return r; | |
440 | } | |
441 | ||
e821075a LP |
442 | static void busname_enter_dead(BusName *n, BusNameResult f) { |
443 | assert(n); | |
444 | ||
a0fef983 | 445 | if (n->result == BUSNAME_SUCCESS) |
e821075a LP |
446 | n->result = f; |
447 | ||
448 | busname_set_state(n, n->result != BUSNAME_SUCCESS ? BUSNAME_FAILED : BUSNAME_DEAD); | |
449 | } | |
450 | ||
a4152e3f LP |
451 | static void busname_enter_signal(BusName *n, BusNameState state, BusNameResult f) { |
452 | KillContext kill_context = {}; | |
e821075a LP |
453 | int r; |
454 | ||
455 | assert(n); | |
456 | ||
a0fef983 | 457 | if (n->result == BUSNAME_SUCCESS) |
a4152e3f LP |
458 | n->result = f; |
459 | ||
460 | kill_context_init(&kill_context); | |
461 | ||
462 | r = unit_kill_context(UNIT(n), | |
463 | &kill_context, | |
db2cb23b | 464 | state != BUSNAME_SIGTERM ? KILL_KILL : KILL_TERMINATE, |
a4152e3f LP |
465 | -1, |
466 | n->control_pid, | |
467 | false); | |
e821075a | 468 | if (r < 0) { |
f2341e0a | 469 | log_unit_warning_errno(UNIT(n), r, "Failed to kill control process: %m"); |
e821075a LP |
470 | goto fail; |
471 | } | |
472 | ||
a4152e3f | 473 | if (r > 0) { |
36c16a7c | 474 | r = busname_arm_timer(n, usec_add(now(CLOCK_MONOTONIC), n->timeout_usec)); |
a4152e3f | 475 | if (r < 0) { |
f2341e0a | 476 | log_unit_warning_errno(UNIT(n), r, "Failed to arm timer: %m"); |
a4152e3f LP |
477 | goto fail; |
478 | } | |
479 | ||
480 | busname_set_state(n, state); | |
481 | } else if (state == BUSNAME_SIGTERM) | |
482 | busname_enter_signal(n, BUSNAME_SIGKILL, BUSNAME_SUCCESS); | |
483 | else | |
484 | busname_enter_dead(n, BUSNAME_SUCCESS); | |
485 | ||
486 | return; | |
487 | ||
488 | fail: | |
489 | busname_enter_dead(n, BUSNAME_FAILURE_RESOURCES); | |
490 | } | |
491 | ||
492 | static void busname_enter_listening(BusName *n) { | |
493 | int r; | |
494 | ||
495 | assert(n); | |
496 | ||
5892a914 DM |
497 | if (n->activating) { |
498 | r = busname_watch_fd(n); | |
499 | if (r < 0) { | |
f2341e0a | 500 | log_unit_warning_errno(UNIT(n), r, "Failed to watch names: %m"); |
5892a914 DM |
501 | goto fail; |
502 | } | |
503 | ||
504 | busname_set_state(n, BUSNAME_LISTENING); | |
505 | } else | |
506 | busname_set_state(n, BUSNAME_REGISTERED); | |
e821075a | 507 | |
e821075a LP |
508 | return; |
509 | ||
a4152e3f LP |
510 | fail: |
511 | busname_enter_signal(n, BUSNAME_SIGTERM, BUSNAME_FAILURE_RESOURCES); | |
512 | } | |
513 | ||
514 | static void busname_enter_making(BusName *n) { | |
515 | int r; | |
516 | ||
517 | assert(n); | |
518 | ||
519 | r = busname_open_fd(n); | |
520 | if (r < 0) | |
521 | goto fail; | |
522 | ||
523 | if (n->policy) { | |
8d0e0ddd | 524 | /* If there is a policy, we need to resolve user/group |
a4152e3f LP |
525 | * names, which we can't do from PID1, hence let's |
526 | * fork. */ | |
527 | busname_unwatch_control_pid(n); | |
528 | ||
529 | r = busname_make_starter(n, &n->control_pid); | |
530 | if (r < 0) { | |
f2341e0a | 531 | log_unit_warning_errno(UNIT(n), r, "Failed to fork 'making' task: %m"); |
a4152e3f LP |
532 | goto fail; |
533 | } | |
534 | ||
535 | busname_set_state(n, BUSNAME_MAKING); | |
536 | } else { | |
8d0e0ddd | 537 | /* If there is no policy, we can do everything |
a4152e3f LP |
538 | * directly from PID 1, hence do so. */ |
539 | ||
540 | r = bus_kernel_make_starter(n->starter_fd, n->name, n->activating, n->accept_fd, NULL, n->policy_world); | |
541 | if (r < 0) { | |
f2341e0a | 542 | log_unit_warning_errno(UNIT(n), r, "Failed to make starter: %m"); |
a4152e3f LP |
543 | goto fail; |
544 | } | |
545 | ||
546 | busname_enter_listening(n); | |
547 | } | |
548 | ||
549 | return; | |
550 | ||
e821075a LP |
551 | fail: |
552 | busname_enter_dead(n, BUSNAME_FAILURE_RESOURCES); | |
553 | } | |
554 | ||
555 | static void busname_enter_running(BusName *n) { | |
4afd3348 | 556 | _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; |
e821075a LP |
557 | bool pending = false; |
558 | Unit *other; | |
559 | Iterator i; | |
560 | int r; | |
561 | ||
562 | assert(n); | |
563 | ||
5892a914 DM |
564 | if (!n->activating) |
565 | return; | |
566 | ||
05a08cb6 | 567 | /* We don't take connections anymore if we are supposed to |
e821075a LP |
568 | * shut down anyway */ |
569 | ||
570 | if (unit_stop_pending(UNIT(n))) { | |
f2341e0a | 571 | log_unit_debug(UNIT(n), "Suppressing activation request since unit stop is scheduled."); |
16ac4014 LP |
572 | |
573 | /* Flush all queued activation reqeuest by closing and reopening the connection */ | |
ff975efb | 574 | bus_kernel_drop_one(n->starter_fd); |
16ac4014 | 575 | |
16ac4014 | 576 | busname_enter_listening(n); |
e821075a LP |
577 | return; |
578 | } | |
579 | ||
580 | /* If there's already a start pending don't bother to do | |
581 | * anything */ | |
582 | SET_FOREACH(other, UNIT(n)->dependencies[UNIT_TRIGGERS], i) | |
583 | if (unit_active_or_pending(other)) { | |
584 | pending = true; | |
585 | break; | |
586 | } | |
587 | ||
588 | if (!pending) { | |
995c5e96 LP |
589 | if (!UNIT_ISSET(n->service)) { |
590 | log_unit_error(UNIT(n), "Service to activate vanished, refusing activation."); | |
591 | r = -ENOENT; | |
592 | goto fail; | |
593 | } | |
594 | ||
4bd29fe5 | 595 | r = manager_add_job(UNIT(n)->manager, JOB_START, UNIT_DEREF(n->service), JOB_REPLACE, &error, NULL); |
e821075a LP |
596 | if (r < 0) |
597 | goto fail; | |
598 | } | |
599 | ||
600 | busname_set_state(n, BUSNAME_RUNNING); | |
601 | return; | |
602 | ||
603 | fail: | |
f2341e0a | 604 | log_unit_warning(UNIT(n), "Failed to queue service startup job: %s", bus_error_message(&error, r)); |
e821075a LP |
605 | busname_enter_dead(n, BUSNAME_FAILURE_RESOURCES); |
606 | } | |
607 | ||
608 | static int busname_start(Unit *u) { | |
609 | BusName *n = BUSNAME(u); | |
07299350 | 610 | int r; |
e821075a LP |
611 | |
612 | assert(n); | |
613 | ||
a4152e3f LP |
614 | /* We cannot fulfill this request right now, try again later |
615 | * please! */ | |
616 | if (IN_SET(n->state, BUSNAME_SIGTERM, BUSNAME_SIGKILL)) | |
617 | return -EAGAIN; | |
618 | ||
619 | /* Already on it! */ | |
620 | if (n->state == BUSNAME_MAKING) | |
621 | return 0; | |
622 | ||
5892a914 | 623 | if (n->activating && UNIT_ISSET(n->service)) { |
e821075a LP |
624 | Service *service; |
625 | ||
626 | service = SERVICE(UNIT_DEREF(n->service)); | |
627 | ||
628 | if (UNIT(service)->load_state != UNIT_LOADED) { | |
f2341e0a | 629 | log_unit_error(u, "Bus service %s not loaded, refusing.", UNIT(service)->id); |
e821075a LP |
630 | return -ENOENT; |
631 | } | |
632 | } | |
633 | ||
634 | assert(IN_SET(n->state, BUSNAME_DEAD, BUSNAME_FAILED)); | |
635 | ||
07299350 LP |
636 | r = unit_start_limit_test(u); |
637 | if (r < 0) { | |
638 | busname_enter_dead(n, BUSNAME_FAILURE_START_LIMIT_HIT); | |
639 | return r; | |
640 | } | |
641 | ||
4b58153d LP |
642 | r = unit_acquire_invocation_id(u); |
643 | if (r < 0) | |
644 | return r; | |
645 | ||
e821075a | 646 | n->result = BUSNAME_SUCCESS; |
a4152e3f | 647 | busname_enter_making(n); |
e821075a | 648 | |
82a2b6bb | 649 | return 1; |
e821075a LP |
650 | } |
651 | ||
652 | static int busname_stop(Unit *u) { | |
653 | BusName *n = BUSNAME(u); | |
654 | ||
655 | assert(n); | |
a4152e3f LP |
656 | |
657 | /* Already on it */ | |
658 | if (IN_SET(n->state, BUSNAME_SIGTERM, BUSNAME_SIGKILL)) | |
659 | return 0; | |
660 | ||
661 | /* If there's already something running, we go directly into | |
662 | * kill mode. */ | |
663 | ||
664 | if (n->state == BUSNAME_MAKING) { | |
665 | busname_enter_signal(n, BUSNAME_SIGTERM, BUSNAME_SUCCESS); | |
666 | return -EAGAIN; | |
667 | } | |
668 | ||
5892a914 | 669 | assert(IN_SET(n->state, BUSNAME_REGISTERED, BUSNAME_LISTENING, BUSNAME_RUNNING)); |
e821075a LP |
670 | |
671 | busname_enter_dead(n, BUSNAME_SUCCESS); | |
82a2b6bb | 672 | return 1; |
e821075a LP |
673 | } |
674 | ||
675 | static int busname_serialize(Unit *u, FILE *f, FDSet *fds) { | |
676 | BusName *n = BUSNAME(u); | |
a34ceba6 | 677 | int r; |
e821075a LP |
678 | |
679 | assert(n); | |
680 | assert(f); | |
681 | assert(fds); | |
682 | ||
683 | unit_serialize_item(u, f, "state", busname_state_to_string(n->state)); | |
684 | unit_serialize_item(u, f, "result", busname_result_to_string(n->result)); | |
685 | ||
a4152e3f LP |
686 | if (n->control_pid > 0) |
687 | unit_serialize_item_format(u, f, "control-pid", PID_FMT, n->control_pid); | |
688 | ||
a34ceba6 LP |
689 | r = unit_serialize_item_fd(u, f, fds, "starter-fd", n->starter_fd); |
690 | if (r < 0) | |
691 | return r; | |
e821075a LP |
692 | |
693 | return 0; | |
694 | } | |
695 | ||
696 | static int busname_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { | |
697 | BusName *n = BUSNAME(u); | |
698 | ||
699 | assert(n); | |
700 | assert(key); | |
701 | assert(value); | |
702 | ||
703 | if (streq(key, "state")) { | |
704 | BusNameState state; | |
705 | ||
706 | state = busname_state_from_string(value); | |
707 | if (state < 0) | |
f2341e0a | 708 | log_unit_debug(u, "Failed to parse state value: %s", value); |
e821075a LP |
709 | else |
710 | n->deserialized_state = state; | |
711 | ||
712 | } else if (streq(key, "result")) { | |
713 | BusNameResult f; | |
714 | ||
715 | f = busname_result_from_string(value); | |
716 | if (f < 0) | |
f2341e0a | 717 | log_unit_debug(u, "Failed to parse result value: %s", value); |
e821075a LP |
718 | else if (f != BUSNAME_SUCCESS) |
719 | n->result = f; | |
720 | ||
a4152e3f LP |
721 | } else if (streq(key, "control-pid")) { |
722 | pid_t pid; | |
723 | ||
724 | if (parse_pid(value, &pid) < 0) | |
f2341e0a | 725 | log_unit_debug(u, "Failed to parse control-pid value: %s", value); |
a4152e3f LP |
726 | else |
727 | n->control_pid = pid; | |
e821075a LP |
728 | } else if (streq(key, "starter-fd")) { |
729 | int fd; | |
730 | ||
731 | if (safe_atoi(value, &fd) < 0 || fd < 0 || !fdset_contains(fds, fd)) | |
f2341e0a | 732 | log_unit_debug(u, "Failed to parse starter fd value: %s", value); |
e821075a | 733 | else { |
03e334a1 | 734 | safe_close(n->starter_fd); |
e821075a LP |
735 | n->starter_fd = fdset_remove(fds, fd); |
736 | } | |
737 | } else | |
f2341e0a | 738 | log_unit_debug(u, "Unknown serialization key: %s", key); |
e821075a LP |
739 | |
740 | return 0; | |
741 | } | |
742 | ||
743 | _pure_ static UnitActiveState busname_active_state(Unit *u) { | |
744 | assert(u); | |
745 | ||
746 | return state_translation_table[BUSNAME(u)->state]; | |
747 | } | |
748 | ||
749 | _pure_ static const char *busname_sub_state_to_string(Unit *u) { | |
750 | assert(u); | |
751 | ||
752 | return busname_state_to_string(BUSNAME(u)->state); | |
753 | } | |
754 | ||
bd5f920f LP |
755 | static int busname_peek_message(BusName *n) { |
756 | struct kdbus_cmd_recv cmd_recv = { | |
94e15fdc | 757 | .size = sizeof(cmd_recv), |
bd5f920f LP |
758 | .flags = KDBUS_RECV_PEEK, |
759 | }; | |
e24e415e DM |
760 | struct kdbus_cmd_free cmd_free = { |
761 | .size = sizeof(cmd_free), | |
762 | }; | |
bd5f920f LP |
763 | const char *comm = NULL; |
764 | struct kdbus_item *d; | |
765 | struct kdbus_msg *k; | |
766 | size_t start, ps, sz, delta; | |
767 | void *p = NULL; | |
768 | pid_t pid = 0; | |
769 | int r; | |
770 | ||
dcc2fc01 LP |
771 | /* Generate a friendly debug log message about which process |
772 | * caused triggering of this bus name. This simply peeks the | |
773 | * metadata of the first queued message and logs it. */ | |
774 | ||
bd5f920f LP |
775 | assert(n); |
776 | ||
dcc2fc01 LP |
777 | /* Let's shortcut things a bit, if debug logging is turned off |
778 | * anyway. */ | |
779 | ||
780 | if (log_get_max_level() < LOG_DEBUG) | |
781 | return 0; | |
bd5f920f | 782 | |
94e15fdc | 783 | r = ioctl(n->starter_fd, KDBUS_CMD_RECV, &cmd_recv); |
bd5f920f LP |
784 | if (r < 0) { |
785 | if (errno == EINTR || errno == EAGAIN) | |
786 | return 0; | |
787 | ||
f2341e0a | 788 | return log_unit_error_errno(UNIT(n), errno, "Failed to query activation message: %m"); |
bd5f920f LP |
789 | } |
790 | ||
791 | /* We map as late as possible, and unmap imemdiately after | |
792 | * use. On 32bit address space is scarce and we want to be | |
793 | * able to handle a lot of activator connections at the same | |
794 | * time, and hence shouldn't keep the mmap()s around for | |
795 | * longer than necessary. */ | |
796 | ||
797 | ps = page_size(); | |
a9c8343e DM |
798 | start = (cmd_recv.msg.offset / ps) * ps; |
799 | delta = cmd_recv.msg.offset - start; | |
800 | sz = PAGE_ALIGN(delta + cmd_recv.msg.msg_size); | |
bd5f920f LP |
801 | |
802 | p = mmap(NULL, sz, PROT_READ, MAP_SHARED, n->starter_fd, start); | |
803 | if (p == MAP_FAILED) { | |
f2341e0a | 804 | r = log_unit_error_errno(UNIT(n), errno, "Failed to map activation message: %m"); |
bd5f920f LP |
805 | goto finish; |
806 | } | |
807 | ||
808 | k = (struct kdbus_msg *) ((uint8_t *) p + delta); | |
809 | KDBUS_ITEM_FOREACH(d, k, items) { | |
810 | switch (d->type) { | |
811 | ||
812 | case KDBUS_ITEM_PIDS: | |
813 | pid = d->pids.pid; | |
814 | break; | |
815 | ||
816 | case KDBUS_ITEM_PID_COMM: | |
817 | comm = d->str; | |
818 | break; | |
819 | } | |
820 | } | |
821 | ||
822 | if (pid > 0) | |
f2341e0a | 823 | log_unit_debug(UNIT(n), "Activation triggered by process " PID_FMT " (%s)", pid, strna(comm)); |
bd5f920f LP |
824 | |
825 | r = 0; | |
826 | ||
827 | finish: | |
828 | if (p) | |
829 | (void) munmap(p, sz); | |
830 | ||
a9c8343e | 831 | cmd_free.offset = cmd_recv.msg.offset; |
dcc2fc01 | 832 | if (ioctl(n->starter_fd, KDBUS_CMD_FREE, &cmd_free) < 0) |
f2341e0a | 833 | log_unit_warning(UNIT(n), "Failed to free peeked message, ignoring: %m"); |
bd5f920f LP |
834 | |
835 | return r; | |
836 | } | |
837 | ||
e821075a LP |
838 | static int busname_dispatch_io(sd_event_source *source, int fd, uint32_t revents, void *userdata) { |
839 | BusName *n = userdata; | |
840 | ||
841 | assert(n); | |
842 | assert(fd >= 0); | |
843 | ||
844 | if (n->state != BUSNAME_LISTENING) | |
845 | return 0; | |
846 | ||
f2341e0a | 847 | log_unit_debug(UNIT(n), "Activation request"); |
e821075a LP |
848 | |
849 | if (revents != EPOLLIN) { | |
f2341e0a | 850 | log_unit_error(UNIT(n), "Got unexpected poll event (0x%x) on starter fd.", revents); |
e821075a LP |
851 | goto fail; |
852 | } | |
853 | ||
bd5f920f | 854 | busname_peek_message(n); |
e821075a LP |
855 | busname_enter_running(n); |
856 | return 0; | |
857 | fail: | |
858 | ||
859 | busname_enter_dead(n, BUSNAME_FAILURE_RESOURCES); | |
860 | return 0; | |
861 | } | |
862 | ||
a4152e3f LP |
863 | static void busname_sigchld_event(Unit *u, pid_t pid, int code, int status) { |
864 | BusName *n = BUSNAME(u); | |
865 | BusNameResult f; | |
866 | ||
867 | assert(n); | |
868 | assert(pid >= 0); | |
869 | ||
870 | if (pid != n->control_pid) | |
871 | return; | |
872 | ||
873 | n->control_pid = 0; | |
874 | ||
875 | if (is_clean_exit(code, status, NULL)) | |
876 | f = BUSNAME_SUCCESS; | |
877 | else if (code == CLD_EXITED) | |
878 | f = BUSNAME_FAILURE_EXIT_CODE; | |
879 | else if (code == CLD_KILLED) | |
880 | f = BUSNAME_FAILURE_SIGNAL; | |
deffddf1 | 881 | else if (code == CLD_DUMPED) |
a4152e3f LP |
882 | f = BUSNAME_FAILURE_CORE_DUMP; |
883 | else | |
884 | assert_not_reached("Unknown sigchld code"); | |
885 | ||
f2341e0a LP |
886 | log_unit_full(u, f == BUSNAME_SUCCESS ? LOG_DEBUG : LOG_NOTICE, 0, |
887 | "Control process exited, code=%s status=%i", sigchld_code_to_string(code), status); | |
a4152e3f | 888 | |
a0fef983 | 889 | if (n->result == BUSNAME_SUCCESS) |
a4152e3f LP |
890 | n->result = f; |
891 | ||
892 | switch (n->state) { | |
893 | ||
894 | case BUSNAME_MAKING: | |
895 | if (f == BUSNAME_SUCCESS) | |
896 | busname_enter_listening(n); | |
897 | else | |
898 | busname_enter_signal(n, BUSNAME_SIGTERM, f); | |
899 | break; | |
900 | ||
901 | case BUSNAME_SIGTERM: | |
902 | case BUSNAME_SIGKILL: | |
903 | busname_enter_dead(n, f); | |
904 | break; | |
905 | ||
906 | default: | |
907 | assert_not_reached("Uh, control process died at wrong time."); | |
908 | } | |
909 | ||
910 | /* Notify clients about changed exit status */ | |
911 | unit_add_to_dbus_queue(u); | |
912 | } | |
913 | ||
914 | static int busname_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) { | |
915 | BusName *n = BUSNAME(userdata); | |
916 | ||
917 | assert(n); | |
918 | assert(n->timer_event_source == source); | |
919 | ||
920 | switch (n->state) { | |
921 | ||
922 | case BUSNAME_MAKING: | |
f2341e0a | 923 | log_unit_warning(UNIT(n), "Making timed out. Terminating."); |
a4152e3f LP |
924 | busname_enter_signal(n, BUSNAME_SIGTERM, BUSNAME_FAILURE_TIMEOUT); |
925 | break; | |
926 | ||
927 | case BUSNAME_SIGTERM: | |
f2341e0a | 928 | log_unit_warning(UNIT(n), "Stopping timed out. Killing."); |
a4152e3f LP |
929 | busname_enter_signal(n, BUSNAME_SIGKILL, BUSNAME_FAILURE_TIMEOUT); |
930 | break; | |
931 | ||
932 | case BUSNAME_SIGKILL: | |
f2341e0a | 933 | log_unit_warning(UNIT(n), "Processes still around after SIGKILL. Ignoring."); |
a4152e3f LP |
934 | busname_enter_dead(n, BUSNAME_FAILURE_TIMEOUT); |
935 | break; | |
936 | ||
937 | default: | |
938 | assert_not_reached("Timeout at wrong time."); | |
939 | } | |
940 | ||
941 | return 0; | |
942 | } | |
943 | ||
e821075a LP |
944 | static void busname_reset_failed(Unit *u) { |
945 | BusName *n = BUSNAME(u); | |
946 | ||
947 | assert(n); | |
948 | ||
949 | if (n->state == BUSNAME_FAILED) | |
950 | busname_set_state(n, BUSNAME_DEAD); | |
951 | ||
952 | n->result = BUSNAME_SUCCESS; | |
953 | } | |
954 | ||
955 | static void busname_trigger_notify(Unit *u, Unit *other) { | |
956 | BusName *n = BUSNAME(u); | |
e821075a LP |
957 | |
958 | assert(n); | |
959 | assert(other); | |
960 | ||
961 | if (!IN_SET(n->state, BUSNAME_RUNNING, BUSNAME_LISTENING)) | |
962 | return; | |
963 | ||
6bf0f408 LP |
964 | if (other->start_limit_hit) { |
965 | busname_enter_dead(n, BUSNAME_FAILURE_SERVICE_START_LIMIT_HIT); | |
e821075a | 966 | return; |
6bf0f408 | 967 | } |
e821075a | 968 | |
6bf0f408 LP |
969 | if (other->load_state != UNIT_LOADED || other->type != UNIT_SERVICE) |
970 | return; | |
e821075a | 971 | |
6bf0f408 LP |
972 | if (IN_SET(SERVICE(other)->state, |
973 | SERVICE_DEAD, SERVICE_FAILED, | |
974 | SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL, | |
975 | SERVICE_AUTO_RESTART)) | |
e821075a | 976 | busname_enter_listening(n); |
6bf0f408 LP |
977 | |
978 | if (SERVICE(other)->state == SERVICE_RUNNING) | |
979 | busname_set_state(n, BUSNAME_RUNNING); | |
e821075a LP |
980 | } |
981 | ||
a4152e3f LP |
982 | static int busname_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) { |
983 | return unit_kill_common(u, who, signo, -1, BUSNAME(u)->control_pid, error); | |
984 | } | |
985 | ||
7a7821c8 | 986 | static int busname_get_timeout(Unit *u, usec_t *timeout) { |
a4152e3f | 987 | BusName *n = BUSNAME(u); |
7a7821c8 | 988 | usec_t t; |
a4152e3f LP |
989 | int r; |
990 | ||
991 | if (!n->timer_event_source) | |
992 | return 0; | |
993 | ||
7a7821c8 | 994 | r = sd_event_source_get_time(n->timer_event_source, &t); |
a4152e3f LP |
995 | if (r < 0) |
996 | return r; | |
7a7821c8 LP |
997 | if (t == USEC_INFINITY) |
998 | return 0; | |
a4152e3f | 999 | |
7a7821c8 | 1000 | *timeout = t; |
a4152e3f LP |
1001 | return 1; |
1002 | } | |
1003 | ||
1c2e9646 | 1004 | static bool busname_supported(void) { |
222953e8 | 1005 | return false; |
0faacd47 LP |
1006 | } |
1007 | ||
291d565a LP |
1008 | static int busname_control_pid(Unit *u) { |
1009 | BusName *n = BUSNAME(u); | |
1010 | ||
1011 | assert(n); | |
1012 | ||
1013 | return n->control_pid; | |
1014 | } | |
1015 | ||
e821075a LP |
1016 | static const char* const busname_result_table[_BUSNAME_RESULT_MAX] = { |
1017 | [BUSNAME_SUCCESS] = "success", | |
1018 | [BUSNAME_FAILURE_RESOURCES] = "resources", | |
a4152e3f LP |
1019 | [BUSNAME_FAILURE_TIMEOUT] = "timeout", |
1020 | [BUSNAME_FAILURE_EXIT_CODE] = "exit-code", | |
1021 | [BUSNAME_FAILURE_SIGNAL] = "signal", | |
1022 | [BUSNAME_FAILURE_CORE_DUMP] = "core-dump", | |
07299350 | 1023 | [BUSNAME_FAILURE_START_LIMIT_HIT] = "start-limit-hit", |
6bf0f408 | 1024 | [BUSNAME_FAILURE_SERVICE_START_LIMIT_HIT] = "service-start-limit-hit", |
e821075a LP |
1025 | }; |
1026 | ||
1027 | DEFINE_STRING_TABLE_LOOKUP(busname_result, BusNameResult); | |
1028 | ||
1029 | const UnitVTable busname_vtable = { | |
1030 | .object_size = sizeof(BusName), | |
1031 | ||
1032 | .sections = | |
1033 | "Unit\0" | |
1034 | "BusName\0" | |
1035 | "Install\0", | |
1036 | .private_section = "BusName", | |
1037 | ||
1038 | .init = busname_init, | |
1039 | .done = busname_done, | |
1040 | .load = busname_load, | |
1041 | ||
1042 | .coldplug = busname_coldplug, | |
1043 | ||
1044 | .dump = busname_dump, | |
1045 | ||
1046 | .start = busname_start, | |
1047 | .stop = busname_stop, | |
1048 | ||
a4152e3f LP |
1049 | .kill = busname_kill, |
1050 | ||
1051 | .get_timeout = busname_get_timeout, | |
1052 | ||
e821075a LP |
1053 | .serialize = busname_serialize, |
1054 | .deserialize_item = busname_deserialize_item, | |
1055 | ||
1056 | .active_state = busname_active_state, | |
1057 | .sub_state_to_string = busname_sub_state_to_string, | |
1058 | ||
a4152e3f LP |
1059 | .sigchld_event = busname_sigchld_event, |
1060 | ||
e821075a LP |
1061 | .trigger_notify = busname_trigger_notify, |
1062 | ||
1063 | .reset_failed = busname_reset_failed, | |
1064 | ||
0faacd47 LP |
1065 | .supported = busname_supported, |
1066 | ||
291d565a LP |
1067 | .control_pid = busname_control_pid, |
1068 | ||
e821075a | 1069 | .bus_vtable = bus_busname_vtable, |
e821075a LP |
1070 | |
1071 | .status_message_formats = { | |
1072 | .finished_start_job = { | |
1073 | [JOB_DONE] = "Listening on %s.", | |
1074 | [JOB_FAILED] = "Failed to listen on %s.", | |
e821075a LP |
1075 | }, |
1076 | .finished_stop_job = { | |
1077 | [JOB_DONE] = "Closed %s.", | |
1078 | [JOB_FAILED] = "Failed stopping %s.", | |
e821075a LP |
1079 | }, |
1080 | }, | |
1081 | }; |