]>
Commit | Line | Data |
---|---|---|
1 | /*-*- Mode: C; c-basic-offset: 8 -*-*/ | |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2010 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 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 | General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
22 | #include <sys/epoll.h> | |
23 | #include <sys/timerfd.h> | |
24 | #include <errno.h> | |
25 | #include <unistd.h> | |
26 | #include <dbus/dbus.h> | |
27 | ||
28 | #include "dbus.h" | |
29 | #include "log.h" | |
30 | #include "strv.h" | |
31 | #include "cgroup.h" | |
32 | #include "dbus-unit.h" | |
33 | #include "dbus-job.h" | |
34 | #include "dbus-manager.h" | |
35 | ||
36 | static void api_bus_dispatch_status(DBusConnection *bus, DBusDispatchStatus status, void *data) { | |
37 | Manager *m = data; | |
38 | ||
39 | assert(bus); | |
40 | assert(m); | |
41 | ||
42 | if (!m->api_bus) | |
43 | return; | |
44 | ||
45 | assert(m->api_bus == bus); | |
46 | ||
47 | m->request_api_bus_dispatch = status != DBUS_DISPATCH_COMPLETE; | |
48 | } | |
49 | ||
50 | static void system_bus_dispatch_status(DBusConnection *bus, DBusDispatchStatus status, void *data) { | |
51 | Manager *m = data; | |
52 | ||
53 | assert(bus); | |
54 | assert(m); | |
55 | ||
56 | if (!m->system_bus) | |
57 | return; | |
58 | ||
59 | assert(m->system_bus == bus); | |
60 | ||
61 | m->request_system_bus_dispatch = status != DBUS_DISPATCH_COMPLETE; | |
62 | } | |
63 | ||
64 | static uint32_t bus_flags_to_events(DBusWatch *bus_watch) { | |
65 | unsigned flags; | |
66 | uint32_t events = 0; | |
67 | ||
68 | assert(bus_watch); | |
69 | ||
70 | /* no watch flags for disabled watches */ | |
71 | if (!dbus_watch_get_enabled(bus_watch)) | |
72 | return 0; | |
73 | ||
74 | flags = dbus_watch_get_flags(bus_watch); | |
75 | ||
76 | if (flags & DBUS_WATCH_READABLE) | |
77 | events |= EPOLLIN; | |
78 | if (flags & DBUS_WATCH_WRITABLE) | |
79 | events |= EPOLLOUT; | |
80 | ||
81 | return events | EPOLLHUP | EPOLLERR; | |
82 | } | |
83 | ||
84 | static unsigned events_to_bus_flags(uint32_t events) { | |
85 | unsigned flags = 0; | |
86 | ||
87 | if (events & EPOLLIN) | |
88 | flags |= DBUS_WATCH_READABLE; | |
89 | if (events & EPOLLOUT) | |
90 | flags |= DBUS_WATCH_WRITABLE; | |
91 | if (events & EPOLLHUP) | |
92 | flags |= DBUS_WATCH_HANGUP; | |
93 | if (events & EPOLLERR) | |
94 | flags |= DBUS_WATCH_ERROR; | |
95 | ||
96 | return flags; | |
97 | } | |
98 | ||
99 | void bus_watch_event(Manager *m, Watch *w, int events) { | |
100 | assert(m); | |
101 | assert(w); | |
102 | ||
103 | /* This is called by the event loop whenever there is | |
104 | * something happening on D-Bus' file handles. */ | |
105 | ||
106 | if (!dbus_watch_get_enabled(w->data.bus_watch)) | |
107 | return; | |
108 | ||
109 | dbus_watch_handle(w->data.bus_watch, events_to_bus_flags(events)); | |
110 | } | |
111 | ||
112 | static dbus_bool_t bus_add_watch(DBusWatch *bus_watch, void *data) { | |
113 | Manager *m = data; | |
114 | Watch *w; | |
115 | struct epoll_event ev; | |
116 | ||
117 | assert(bus_watch); | |
118 | assert(m); | |
119 | ||
120 | if (!(w = new0(Watch, 1))) | |
121 | return FALSE; | |
122 | ||
123 | w->fd = dbus_watch_get_unix_fd(bus_watch); | |
124 | w->type = WATCH_DBUS_WATCH; | |
125 | w->data.bus_watch = bus_watch; | |
126 | ||
127 | zero(ev); | |
128 | ev.events = bus_flags_to_events(bus_watch); | |
129 | ev.data.ptr = w; | |
130 | ||
131 | if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, w->fd, &ev) < 0) { | |
132 | ||
133 | if (errno != EEXIST) { | |
134 | free(w); | |
135 | return FALSE; | |
136 | } | |
137 | ||
138 | /* Hmm, bloody D-Bus creates multiple watches on the | |
139 | * same fd. epoll() does not like that. As a dirty | |
140 | * hack we simply dup() the fd and hence get a second | |
141 | * one we can safely add to the epoll(). */ | |
142 | ||
143 | if ((w->fd = dup(w->fd)) < 0) { | |
144 | free(w); | |
145 | return FALSE; | |
146 | } | |
147 | ||
148 | if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, w->fd, &ev) < 0) { | |
149 | free(w); | |
150 | close_nointr_nofail(w->fd); | |
151 | return FALSE; | |
152 | } | |
153 | ||
154 | w->fd_is_dupped = true; | |
155 | } | |
156 | ||
157 | dbus_watch_set_data(bus_watch, w, NULL); | |
158 | ||
159 | return TRUE; | |
160 | } | |
161 | ||
162 | static void bus_remove_watch(DBusWatch *bus_watch, void *data) { | |
163 | Manager *m = data; | |
164 | Watch *w; | |
165 | ||
166 | assert(bus_watch); | |
167 | assert(m); | |
168 | ||
169 | if (!(w = dbus_watch_get_data(bus_watch))) | |
170 | return; | |
171 | ||
172 | assert(w->type == WATCH_DBUS_WATCH); | |
173 | assert_se(epoll_ctl(m->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0); | |
174 | ||
175 | if (w->fd_is_dupped) | |
176 | close_nointr_nofail(w->fd); | |
177 | ||
178 | free(w); | |
179 | } | |
180 | ||
181 | static void bus_toggle_watch(DBusWatch *bus_watch, void *data) { | |
182 | Manager *m = data; | |
183 | Watch *w; | |
184 | struct epoll_event ev; | |
185 | ||
186 | assert(bus_watch); | |
187 | assert(m); | |
188 | ||
189 | assert_se(w = dbus_watch_get_data(bus_watch)); | |
190 | assert(w->type == WATCH_DBUS_WATCH); | |
191 | ||
192 | zero(ev); | |
193 | ev.events = bus_flags_to_events(bus_watch); | |
194 | ev.data.ptr = w; | |
195 | ||
196 | assert_se(epoll_ctl(m->epoll_fd, EPOLL_CTL_MOD, w->fd, &ev) == 0); | |
197 | } | |
198 | ||
199 | static int bus_timeout_arm(Manager *m, Watch *w) { | |
200 | struct itimerspec its; | |
201 | ||
202 | assert(m); | |
203 | assert(w); | |
204 | ||
205 | zero(its); | |
206 | ||
207 | if (dbus_timeout_get_enabled(w->data.bus_timeout)) { | |
208 | timespec_store(&its.it_value, dbus_timeout_get_interval(w->data.bus_timeout) * USEC_PER_MSEC); | |
209 | its.it_interval = its.it_interval; | |
210 | } | |
211 | ||
212 | if (timerfd_settime(w->fd, 0, &its, NULL) < 0) | |
213 | return -errno; | |
214 | ||
215 | return 0; | |
216 | } | |
217 | ||
218 | void bus_timeout_event(Manager *m, Watch *w, int events) { | |
219 | assert(m); | |
220 | assert(w); | |
221 | ||
222 | /* This is called by the event loop whenever there is | |
223 | * something happening on D-Bus' file handles. */ | |
224 | ||
225 | if (!(dbus_timeout_get_enabled(w->data.bus_timeout))) | |
226 | return; | |
227 | ||
228 | dbus_timeout_handle(w->data.bus_timeout); | |
229 | } | |
230 | ||
231 | static dbus_bool_t bus_add_timeout(DBusTimeout *timeout, void *data) { | |
232 | Manager *m = data; | |
233 | Watch *w; | |
234 | struct epoll_event ev; | |
235 | ||
236 | assert(timeout); | |
237 | assert(m); | |
238 | ||
239 | if (!(w = new0(Watch, 1))) | |
240 | return FALSE; | |
241 | ||
242 | if (!(w->fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC)) < 0) | |
243 | goto fail; | |
244 | ||
245 | w->type = WATCH_DBUS_TIMEOUT; | |
246 | w->data.bus_timeout = timeout; | |
247 | ||
248 | if (bus_timeout_arm(m, w) < 0) | |
249 | goto fail; | |
250 | ||
251 | zero(ev); | |
252 | ev.events = EPOLLIN; | |
253 | ev.data.ptr = w; | |
254 | ||
255 | if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, w->fd, &ev) < 0) | |
256 | goto fail; | |
257 | ||
258 | dbus_timeout_set_data(timeout, w, NULL); | |
259 | ||
260 | return TRUE; | |
261 | ||
262 | fail: | |
263 | if (w->fd >= 0) | |
264 | close_nointr_nofail(w->fd); | |
265 | ||
266 | free(w); | |
267 | return FALSE; | |
268 | } | |
269 | ||
270 | static void bus_remove_timeout(DBusTimeout *timeout, void *data) { | |
271 | Manager *m = data; | |
272 | Watch *w; | |
273 | ||
274 | assert(timeout); | |
275 | assert(m); | |
276 | ||
277 | if (!(w = dbus_timeout_get_data(timeout))) | |
278 | return; | |
279 | ||
280 | assert(w->type == WATCH_DBUS_TIMEOUT); | |
281 | assert_se(epoll_ctl(m->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0); | |
282 | close_nointr_nofail(w->fd); | |
283 | free(w); | |
284 | } | |
285 | ||
286 | static void bus_toggle_timeout(DBusTimeout *timeout, void *data) { | |
287 | Manager *m = data; | |
288 | Watch *w; | |
289 | int r; | |
290 | ||
291 | assert(timeout); | |
292 | assert(m); | |
293 | ||
294 | assert_se(w = dbus_timeout_get_data(timeout)); | |
295 | assert(w->type == WATCH_DBUS_TIMEOUT); | |
296 | ||
297 | if ((r = bus_timeout_arm(m, w)) < 0) | |
298 | log_error("Failed to rearm timer: %s", strerror(-r)); | |
299 | } | |
300 | ||
301 | static DBusHandlerResult api_bus_message_filter(DBusConnection *connection, DBusMessage *message, void *data) { | |
302 | Manager *m = data; | |
303 | DBusError error; | |
304 | ||
305 | assert(connection); | |
306 | assert(message); | |
307 | assert(m); | |
308 | ||
309 | dbus_error_init(&error); | |
310 | ||
311 | /* log_debug("Got D-Bus request: %s.%s() on %s", */ | |
312 | /* dbus_message_get_interface(message), */ | |
313 | /* dbus_message_get_member(message), */ | |
314 | /* dbus_message_get_path(message)); */ | |
315 | ||
316 | if (dbus_message_is_signal(message, DBUS_INTERFACE_LOCAL, "Disconnected")) { | |
317 | log_error("Warning! API D-Bus connection terminated."); | |
318 | bus_done_api(m); | |
319 | ||
320 | } else if (dbus_message_is_signal(message, DBUS_INTERFACE_DBUS, "NameOwnerChanged")) { | |
321 | const char *name, *old_owner, *new_owner; | |
322 | ||
323 | if (!dbus_message_get_args(message, &error, | |
324 | DBUS_TYPE_STRING, &name, | |
325 | DBUS_TYPE_STRING, &old_owner, | |
326 | DBUS_TYPE_STRING, &new_owner, | |
327 | DBUS_TYPE_INVALID)) | |
328 | log_error("Failed to parse NameOwnerChanged message: %s", error.message); | |
329 | else { | |
330 | if (set_remove(m->subscribed, (char*) name)) | |
331 | log_debug("Subscription client vanished: %s (left: %u)", name, set_size(m->subscribed)); | |
332 | ||
333 | if (old_owner[0] == 0) | |
334 | old_owner = NULL; | |
335 | ||
336 | if (new_owner[0] == 0) | |
337 | new_owner = NULL; | |
338 | ||
339 | manager_dispatch_bus_name_owner_changed(m, name, old_owner, new_owner); | |
340 | } | |
341 | } | |
342 | ||
343 | dbus_error_free(&error); | |
344 | return DBUS_HANDLER_RESULT_NOT_YET_HANDLED; | |
345 | } | |
346 | ||
347 | static DBusHandlerResult system_bus_message_filter(DBusConnection *connection, DBusMessage *message, void *data) { | |
348 | Manager *m = data; | |
349 | DBusError error; | |
350 | ||
351 | assert(connection); | |
352 | assert(message); | |
353 | assert(m); | |
354 | ||
355 | dbus_error_init(&error); | |
356 | ||
357 | /* log_debug("Got D-Bus request: %s.%s() on %s", */ | |
358 | /* dbus_message_get_interface(message), */ | |
359 | /* dbus_message_get_member(message), */ | |
360 | /* dbus_message_get_path(message)); */ | |
361 | ||
362 | if (dbus_message_is_signal(message, DBUS_INTERFACE_LOCAL, "Disconnected")) { | |
363 | log_error("Warning! System D-Bus connection terminated."); | |
364 | bus_done_system(m); | |
365 | ||
366 | } if (dbus_message_is_signal(message, "org.freedesktop.systemd1.Agent", "Released")) { | |
367 | const char *cgroup; | |
368 | ||
369 | if (!dbus_message_get_args(message, &error, | |
370 | DBUS_TYPE_STRING, &cgroup, | |
371 | DBUS_TYPE_INVALID)) | |
372 | log_error("Failed to parse Released message: %s", error.message); | |
373 | else | |
374 | cgroup_notify_empty(m, cgroup); | |
375 | } | |
376 | ||
377 | dbus_error_free(&error); | |
378 | return DBUS_HANDLER_RESULT_NOT_YET_HANDLED; | |
379 | } | |
380 | ||
381 | unsigned bus_dispatch(Manager *m) { | |
382 | assert(m); | |
383 | ||
384 | if (m->queued_message) { | |
385 | /* If we cannot get rid of this message we won't | |
386 | * dispatch any D-Bus messages, so that we won't end | |
387 | * up wanting to queue another message. */ | |
388 | ||
389 | if (!dbus_connection_send(m->api_bus, m->queued_message, NULL)) | |
390 | return 0; | |
391 | ||
392 | dbus_message_unref(m->queued_message); | |
393 | m->queued_message = NULL; | |
394 | } | |
395 | ||
396 | if (m->request_api_bus_dispatch) { | |
397 | if (dbus_connection_dispatch(m->api_bus) == DBUS_DISPATCH_COMPLETE) | |
398 | m->request_api_bus_dispatch = false; | |
399 | ||
400 | return 1; | |
401 | } | |
402 | ||
403 | if (m->request_system_bus_dispatch) { | |
404 | if (dbus_connection_dispatch(m->system_bus) == DBUS_DISPATCH_COMPLETE) | |
405 | m->request_system_bus_dispatch = false; | |
406 | ||
407 | return 1; | |
408 | } | |
409 | ||
410 | return 0; | |
411 | } | |
412 | ||
413 | static void request_name_pending_cb(DBusPendingCall *pending, void *userdata) { | |
414 | DBusMessage *reply; | |
415 | DBusError error; | |
416 | ||
417 | dbus_error_init(&error); | |
418 | ||
419 | assert_se(reply = dbus_pending_call_steal_reply(pending)); | |
420 | ||
421 | switch (dbus_message_get_type(reply)) { | |
422 | ||
423 | case DBUS_MESSAGE_TYPE_ERROR: | |
424 | ||
425 | assert_se(dbus_set_error_from_message(&error, reply)); | |
426 | log_warning("RequestName() failed: %s", error.message); | |
427 | break; | |
428 | ||
429 | case DBUS_MESSAGE_TYPE_METHOD_RETURN: { | |
430 | uint32_t r; | |
431 | ||
432 | if (!dbus_message_get_args(reply, | |
433 | &error, | |
434 | DBUS_TYPE_UINT32, &r, | |
435 | DBUS_TYPE_INVALID)) { | |
436 | log_error("Failed to parse RequestName() reply: %s", error.message); | |
437 | break; | |
438 | } | |
439 | ||
440 | if (r == 1) | |
441 | log_debug("Successfully acquired name."); | |
442 | else | |
443 | log_error("Name already owned."); | |
444 | ||
445 | break; | |
446 | } | |
447 | ||
448 | default: | |
449 | assert_not_reached("Invalid reply message"); | |
450 | } | |
451 | ||
452 | dbus_message_unref(reply); | |
453 | dbus_error_free(&error); | |
454 | } | |
455 | ||
456 | static int request_name(Manager *m) { | |
457 | const char *name = "org.freedesktop.systemd1"; | |
458 | uint32_t flags = 0; | |
459 | DBusMessage *message = NULL; | |
460 | DBusPendingCall *pending = NULL; | |
461 | ||
462 | if (!(message = dbus_message_new_method_call( | |
463 | DBUS_SERVICE_DBUS, | |
464 | DBUS_PATH_DBUS, | |
465 | DBUS_INTERFACE_DBUS, | |
466 | "RequestName"))) | |
467 | goto oom; | |
468 | ||
469 | if (!dbus_message_append_args( | |
470 | message, | |
471 | DBUS_TYPE_STRING, &name, | |
472 | DBUS_TYPE_UINT32, &flags, | |
473 | DBUS_TYPE_INVALID)) | |
474 | goto oom; | |
475 | ||
476 | if (!dbus_connection_send_with_reply(m->api_bus, message, &pending, -1)) | |
477 | goto oom; | |
478 | ||
479 | if (!dbus_pending_call_set_notify(pending, request_name_pending_cb, m, NULL)) | |
480 | goto oom; | |
481 | ||
482 | dbus_message_unref(message); | |
483 | dbus_pending_call_unref(pending); | |
484 | ||
485 | /* We simple ask for the name and don't wait for it. Sooner or | |
486 | * later we'll have it. */ | |
487 | ||
488 | return 0; | |
489 | ||
490 | oom: | |
491 | if (pending) { | |
492 | dbus_pending_call_cancel(pending); | |
493 | dbus_pending_call_unref(pending); | |
494 | } | |
495 | ||
496 | if (message) | |
497 | dbus_message_unref(message); | |
498 | ||
499 | return -ENOMEM; | |
500 | } | |
501 | ||
502 | static int bus_setup_loop(Manager *m, DBusConnection *bus) { | |
503 | assert(m); | |
504 | assert(bus); | |
505 | ||
506 | dbus_connection_set_exit_on_disconnect(bus, FALSE); | |
507 | ||
508 | if (!dbus_connection_set_watch_functions(bus, bus_add_watch, bus_remove_watch, bus_toggle_watch, m, NULL) || | |
509 | !dbus_connection_set_timeout_functions(bus, bus_add_timeout, bus_remove_timeout, bus_toggle_timeout, m, NULL)) | |
510 | return -ENOMEM; | |
511 | ||
512 | return 0; | |
513 | } | |
514 | ||
515 | int bus_init_system(Manager *m) { | |
516 | DBusError error; | |
517 | char *id; | |
518 | int r; | |
519 | ||
520 | assert(m); | |
521 | ||
522 | dbus_error_init(&error); | |
523 | ||
524 | if (m->system_bus) | |
525 | return 0; | |
526 | ||
527 | if (m->running_as != MANAGER_SESSION && m->api_bus) | |
528 | m->system_bus = m->api_bus; | |
529 | else { | |
530 | if (!(m->system_bus = dbus_bus_get_private(DBUS_BUS_SYSTEM, &error))) { | |
531 | log_debug("Failed to get system D-Bus connection, retrying later: %s", error.message); | |
532 | dbus_error_free(&error); | |
533 | return 0; | |
534 | } | |
535 | ||
536 | dbus_connection_set_dispatch_status_function(m->system_bus, system_bus_dispatch_status, m, NULL); | |
537 | m->request_system_bus_dispatch = true; | |
538 | ||
539 | if ((r = bus_setup_loop(m, m->system_bus)) < 0) { | |
540 | bus_done_system(m); | |
541 | return r; | |
542 | } | |
543 | } | |
544 | ||
545 | if (!dbus_connection_add_filter(m->system_bus, system_bus_message_filter, m, NULL)) { | |
546 | bus_done_system(m); | |
547 | return -ENOMEM; | |
548 | } | |
549 | ||
550 | dbus_bus_add_match(m->system_bus, | |
551 | "type='signal'," | |
552 | "interface='org.freedesktop.systemd1.Agent'," | |
553 | "path='/org/freedesktop/systemd1/agent'", | |
554 | &error); | |
555 | ||
556 | if (dbus_error_is_set(&error)) { | |
557 | log_error("Failed to register match: %s", error.message); | |
558 | dbus_error_free(&error); | |
559 | bus_done_system(m); | |
560 | return -ENOMEM; | |
561 | } | |
562 | ||
563 | log_debug("Successfully connected to system D-Bus bus %s as %s", | |
564 | strnull((id = dbus_connection_get_server_id(m->system_bus))), | |
565 | strnull(dbus_bus_get_unique_name(m->system_bus))); | |
566 | dbus_free(id); | |
567 | ||
568 | return 0; | |
569 | } | |
570 | ||
571 | int bus_init_api(Manager *m) { | |
572 | DBusError error; | |
573 | char *id; | |
574 | int r; | |
575 | ||
576 | assert(m); | |
577 | ||
578 | dbus_error_init(&error); | |
579 | ||
580 | if (m->api_bus) | |
581 | return 0; | |
582 | ||
583 | if (m->name_data_slot < 0) | |
584 | if (!dbus_pending_call_allocate_data_slot(&m->name_data_slot)) | |
585 | return -ENOMEM; | |
586 | ||
587 | if (m->running_as != MANAGER_SESSION && m->system_bus) | |
588 | m->api_bus = m->system_bus; | |
589 | else { | |
590 | if (!(m->api_bus = dbus_bus_get_private(m->running_as == MANAGER_SESSION ? DBUS_BUS_SESSION : DBUS_BUS_SYSTEM, &error))) { | |
591 | log_debug("Failed to get API D-Bus connection, retrying later: %s", error.message); | |
592 | dbus_error_free(&error); | |
593 | return 0; | |
594 | } | |
595 | ||
596 | dbus_connection_set_dispatch_status_function(m->api_bus, api_bus_dispatch_status, m, NULL); | |
597 | m->request_api_bus_dispatch = true; | |
598 | ||
599 | if ((r = bus_setup_loop(m, m->api_bus)) < 0) { | |
600 | bus_done_api(m); | |
601 | return r; | |
602 | } | |
603 | } | |
604 | ||
605 | if (!dbus_connection_register_object_path(m->api_bus, "/org/freedesktop/systemd1", &bus_manager_vtable, m) || | |
606 | !dbus_connection_register_fallback(m->api_bus, "/org/freedesktop/systemd1/unit", &bus_unit_vtable, m) || | |
607 | !dbus_connection_register_fallback(m->api_bus, "/org/freedesktop/systemd1/job", &bus_job_vtable, m) || | |
608 | !dbus_connection_add_filter(m->api_bus, api_bus_message_filter, m, NULL)) { | |
609 | bus_done_api(m); | |
610 | return -ENOMEM; | |
611 | } | |
612 | ||
613 | dbus_bus_add_match(m->api_bus, | |
614 | "type='signal'," | |
615 | "sender='"DBUS_SERVICE_DBUS"'," | |
616 | "interface='"DBUS_INTERFACE_DBUS"'," | |
617 | "path='"DBUS_PATH_DBUS"'", | |
618 | &error); | |
619 | ||
620 | if (dbus_error_is_set(&error)) { | |
621 | log_error("Failed to register match: %s", error.message); | |
622 | dbus_error_free(&error); | |
623 | bus_done_api(m); | |
624 | return -ENOMEM; | |
625 | } | |
626 | ||
627 | if ((r = request_name(m)) < 0) { | |
628 | bus_done_api(m); | |
629 | return r; | |
630 | } | |
631 | ||
632 | log_debug("Successfully connected to API D-Bus bus %s as %s", | |
633 | strnull((id = dbus_connection_get_server_id(m->api_bus))), | |
634 | strnull(dbus_bus_get_unique_name(m->api_bus))); | |
635 | dbus_free(id); | |
636 | ||
637 | if (!m->subscribed) | |
638 | if (!(m->subscribed = set_new(string_hash_func, string_compare_func))) | |
639 | return -ENOMEM; | |
640 | ||
641 | return 0; | |
642 | } | |
643 | ||
644 | void bus_done_api(Manager *m) { | |
645 | assert(m); | |
646 | ||
647 | if (m->api_bus) { | |
648 | if (m->system_bus == m->api_bus) | |
649 | m->system_bus = NULL; | |
650 | ||
651 | dbus_connection_set_dispatch_status_function(m->api_bus, NULL, NULL, NULL); | |
652 | dbus_connection_flush(m->api_bus); | |
653 | dbus_connection_close(m->api_bus); | |
654 | dbus_connection_unref(m->api_bus); | |
655 | m->api_bus = NULL; | |
656 | } | |
657 | ||
658 | if (m->subscribed) { | |
659 | char *c; | |
660 | ||
661 | while ((c = set_steal_first(m->subscribed))) | |
662 | free(c); | |
663 | ||
664 | set_free(m->subscribed); | |
665 | m->subscribed = NULL; | |
666 | } | |
667 | ||
668 | if (m->name_data_slot >= 0) | |
669 | dbus_pending_call_free_data_slot(&m->name_data_slot); | |
670 | ||
671 | if (m->queued_message) { | |
672 | dbus_message_unref(m->queued_message); | |
673 | m->queued_message = NULL; | |
674 | } | |
675 | } | |
676 | ||
677 | void bus_done_system(Manager *m) { | |
678 | assert(m); | |
679 | ||
680 | if (m->system_bus == m->api_bus) | |
681 | bus_done_api(m); | |
682 | ||
683 | if (m->system_bus) { | |
684 | dbus_connection_set_dispatch_status_function(m->system_bus, NULL, NULL, NULL); | |
685 | dbus_connection_flush(m->system_bus); | |
686 | dbus_connection_close(m->system_bus); | |
687 | dbus_connection_unref(m->system_bus); | |
688 | m->system_bus = NULL; | |
689 | } | |
690 | } | |
691 | ||
692 | static void query_pid_pending_cb(DBusPendingCall *pending, void *userdata) { | |
693 | Manager *m = userdata; | |
694 | DBusMessage *reply; | |
695 | DBusError error; | |
696 | const char *name; | |
697 | ||
698 | dbus_error_init(&error); | |
699 | ||
700 | assert_se(name = dbus_pending_call_get_data(pending, m->name_data_slot)); | |
701 | assert_se(reply = dbus_pending_call_steal_reply(pending)); | |
702 | ||
703 | switch (dbus_message_get_type(reply)) { | |
704 | ||
705 | case DBUS_MESSAGE_TYPE_ERROR: | |
706 | ||
707 | assert_se(dbus_set_error_from_message(&error, reply)); | |
708 | log_warning("GetConnectionUnixProcessID() failed: %s", error.message); | |
709 | break; | |
710 | ||
711 | case DBUS_MESSAGE_TYPE_METHOD_RETURN: { | |
712 | uint32_t r; | |
713 | ||
714 | if (!dbus_message_get_args(reply, | |
715 | &error, | |
716 | DBUS_TYPE_UINT32, &r, | |
717 | DBUS_TYPE_INVALID)) { | |
718 | log_error("Failed to parse GetConnectionUnixProcessID() reply: %s", error.message); | |
719 | break; | |
720 | } | |
721 | ||
722 | manager_dispatch_bus_query_pid_done(m, name, (pid_t) r); | |
723 | break; | |
724 | } | |
725 | ||
726 | default: | |
727 | assert_not_reached("Invalid reply message"); | |
728 | } | |
729 | ||
730 | dbus_message_unref(reply); | |
731 | dbus_error_free(&error); | |
732 | } | |
733 | ||
734 | int bus_query_pid(Manager *m, const char *name) { | |
735 | DBusMessage *message = NULL; | |
736 | DBusPendingCall *pending = NULL; | |
737 | char *n = NULL; | |
738 | ||
739 | assert(m); | |
740 | assert(name); | |
741 | ||
742 | if (!(message = dbus_message_new_method_call( | |
743 | DBUS_SERVICE_DBUS, | |
744 | DBUS_PATH_DBUS, | |
745 | DBUS_INTERFACE_DBUS, | |
746 | "GetConnectionUnixProcessID"))) | |
747 | goto oom; | |
748 | ||
749 | if (!(dbus_message_append_args( | |
750 | message, | |
751 | DBUS_TYPE_STRING, &name, | |
752 | DBUS_TYPE_INVALID))) | |
753 | goto oom; | |
754 | ||
755 | if (!dbus_connection_send_with_reply(m->api_bus, message, &pending, -1)) | |
756 | goto oom; | |
757 | ||
758 | if (!(n = strdup(name))) | |
759 | goto oom; | |
760 | ||
761 | if (!dbus_pending_call_set_data(pending, m->name_data_slot, n, free)) | |
762 | goto oom; | |
763 | ||
764 | n = NULL; | |
765 | ||
766 | if (!dbus_pending_call_set_notify(pending, query_pid_pending_cb, m, NULL)) | |
767 | goto oom; | |
768 | ||
769 | dbus_message_unref(message); | |
770 | dbus_pending_call_unref(pending); | |
771 | ||
772 | return 0; | |
773 | ||
774 | oom: | |
775 | free(n); | |
776 | ||
777 | if (pending) { | |
778 | dbus_pending_call_cancel(pending); | |
779 | dbus_pending_call_unref(pending); | |
780 | } | |
781 | ||
782 | if (message) | |
783 | dbus_message_unref(message); | |
784 | ||
785 | return -ENOMEM; | |
786 | } | |
787 | ||
788 | DBusHandlerResult bus_default_message_handler(Manager *m, DBusMessage *message, const char*introspection, const BusProperty *properties) { | |
789 | DBusError error; | |
790 | DBusMessage *reply = NULL; | |
791 | int r; | |
792 | ||
793 | assert(m); | |
794 | assert(message); | |
795 | ||
796 | dbus_error_init(&error); | |
797 | ||
798 | if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Introspectable", "Introspect") && introspection) { | |
799 | ||
800 | if (!(reply = dbus_message_new_method_return(message))) | |
801 | goto oom; | |
802 | ||
803 | if (!dbus_message_append_args(reply, DBUS_TYPE_STRING, &introspection, DBUS_TYPE_INVALID)) | |
804 | goto oom; | |
805 | ||
806 | } else if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Properties", "Get") && properties) { | |
807 | const char *interface, *property; | |
808 | const BusProperty *p; | |
809 | ||
810 | if (!dbus_message_get_args( | |
811 | message, | |
812 | &error, | |
813 | DBUS_TYPE_STRING, &interface, | |
814 | DBUS_TYPE_STRING, &property, | |
815 | DBUS_TYPE_INVALID)) | |
816 | return bus_send_error_reply(m, message, &error, -EINVAL); | |
817 | ||
818 | for (p = properties; p->property; p++) | |
819 | if (streq(p->interface, interface) && streq(p->property, property)) | |
820 | break; | |
821 | ||
822 | if (p->property) { | |
823 | DBusMessageIter iter, sub; | |
824 | ||
825 | if (!(reply = dbus_message_new_method_return(message))) | |
826 | goto oom; | |
827 | ||
828 | dbus_message_iter_init_append(reply, &iter); | |
829 | ||
830 | if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_VARIANT, p->signature, &sub)) | |
831 | goto oom; | |
832 | ||
833 | if ((r = p->append(m, &sub, property, (void*) p->data)) < 0) { | |
834 | ||
835 | if (r == -ENOMEM) | |
836 | goto oom; | |
837 | ||
838 | dbus_message_unref(reply); | |
839 | return bus_send_error_reply(m, message, NULL, r); | |
840 | } | |
841 | ||
842 | if (!dbus_message_iter_close_container(&iter, &sub)) | |
843 | goto oom; | |
844 | } | |
845 | } else if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Properties", "GetAll") && properties) { | |
846 | const char *interface; | |
847 | const BusProperty *p; | |
848 | DBusMessageIter iter, sub, sub2, sub3; | |
849 | bool any = false; | |
850 | ||
851 | if (!dbus_message_get_args( | |
852 | message, | |
853 | &error, | |
854 | DBUS_TYPE_STRING, &interface, | |
855 | DBUS_TYPE_INVALID)) | |
856 | return bus_send_error_reply(m, message, &error, -EINVAL); | |
857 | ||
858 | if (!(reply = dbus_message_new_method_return(message))) | |
859 | goto oom; | |
860 | ||
861 | dbus_message_iter_init_append(reply, &iter); | |
862 | ||
863 | if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, "{sv}", &sub)) | |
864 | goto oom; | |
865 | ||
866 | for (p = properties; p->property; p++) { | |
867 | if (!streq(p->interface, interface)) | |
868 | continue; | |
869 | ||
870 | if (!dbus_message_iter_open_container(&sub, DBUS_TYPE_DICT_ENTRY, NULL, &sub2) || | |
871 | !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &p->property) || | |
872 | !dbus_message_iter_open_container(&sub2, DBUS_TYPE_VARIANT, p->signature, &sub3)) | |
873 | goto oom; | |
874 | ||
875 | if ((r = p->append(m, &sub3, p->property, (void*) p->data)) < 0) { | |
876 | ||
877 | if (r == -ENOMEM) | |
878 | goto oom; | |
879 | ||
880 | dbus_message_unref(reply); | |
881 | return bus_send_error_reply(m, message, NULL, r); | |
882 | } | |
883 | ||
884 | if (!dbus_message_iter_close_container(&sub2, &sub3) || | |
885 | !dbus_message_iter_close_container(&sub, &sub2)) | |
886 | goto oom; | |
887 | ||
888 | any = true; | |
889 | } | |
890 | ||
891 | if (!dbus_message_iter_close_container(&iter, &sub)) | |
892 | goto oom; | |
893 | } | |
894 | ||
895 | if (reply) { | |
896 | if (!dbus_connection_send(m->api_bus, reply, NULL)) | |
897 | goto oom; | |
898 | ||
899 | dbus_message_unref(reply); | |
900 | return DBUS_HANDLER_RESULT_HANDLED; | |
901 | } | |
902 | ||
903 | return DBUS_HANDLER_RESULT_NOT_YET_HANDLED; | |
904 | ||
905 | oom: | |
906 | if (reply) | |
907 | dbus_message_unref(reply); | |
908 | ||
909 | dbus_error_free(&error); | |
910 | ||
911 | return DBUS_HANDLER_RESULT_NEED_MEMORY; | |
912 | } | |
913 | ||
914 | static const char *error_to_dbus(int error) { | |
915 | ||
916 | switch(error) { | |
917 | ||
918 | case -EINVAL: | |
919 | return DBUS_ERROR_INVALID_ARGS; | |
920 | ||
921 | case -ENOMEM: | |
922 | return DBUS_ERROR_NO_MEMORY; | |
923 | ||
924 | case -EPERM: | |
925 | case -EACCES: | |
926 | return DBUS_ERROR_ACCESS_DENIED; | |
927 | ||
928 | case -ESRCH: | |
929 | return DBUS_ERROR_UNIX_PROCESS_ID_UNKNOWN; | |
930 | ||
931 | case -ENOENT: | |
932 | return DBUS_ERROR_FILE_NOT_FOUND; | |
933 | ||
934 | case -EEXIST: | |
935 | return DBUS_ERROR_FILE_EXISTS; | |
936 | ||
937 | case -ETIMEDOUT: | |
938 | return DBUS_ERROR_TIMEOUT; | |
939 | ||
940 | case -EIO: | |
941 | return DBUS_ERROR_IO_ERROR; | |
942 | ||
943 | case -ENETRESET: | |
944 | case -ECONNABORTED: | |
945 | case -ECONNRESET: | |
946 | return DBUS_ERROR_DISCONNECTED; | |
947 | } | |
948 | ||
949 | return DBUS_ERROR_FAILED; | |
950 | } | |
951 | ||
952 | DBusHandlerResult bus_send_error_reply(Manager *m, DBusMessage *message, DBusError *bus_error, int error) { | |
953 | DBusMessage *reply = NULL; | |
954 | const char *name, *text; | |
955 | ||
956 | if (bus_error && dbus_error_is_set(bus_error)) { | |
957 | name = bus_error->name; | |
958 | text = bus_error->message; | |
959 | } else { | |
960 | name = error_to_dbus(error); | |
961 | text = strerror(-error); | |
962 | } | |
963 | ||
964 | if (!(reply = dbus_message_new_error(message, name, text))) | |
965 | goto oom; | |
966 | ||
967 | if (!dbus_connection_send(m->api_bus, reply, NULL)) | |
968 | goto oom; | |
969 | ||
970 | dbus_message_unref(reply); | |
971 | ||
972 | if (bus_error) | |
973 | dbus_error_free(bus_error); | |
974 | ||
975 | return DBUS_HANDLER_RESULT_HANDLED; | |
976 | ||
977 | oom: | |
978 | if (reply) | |
979 | dbus_message_unref(reply); | |
980 | ||
981 | if (bus_error) | |
982 | dbus_error_free(bus_error); | |
983 | ||
984 | return DBUS_HANDLER_RESULT_NEED_MEMORY; | |
985 | } | |
986 | ||
987 | int bus_property_append_string(Manager *m, DBusMessageIter *i, const char *property, void *data) { | |
988 | const char *t = data; | |
989 | ||
990 | assert(m); | |
991 | assert(i); | |
992 | assert(property); | |
993 | ||
994 | if (!t) | |
995 | t = ""; | |
996 | ||
997 | if (!dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, &t)) | |
998 | return -ENOMEM; | |
999 | ||
1000 | return 0; | |
1001 | } | |
1002 | ||
1003 | int bus_property_append_strv(Manager *m, DBusMessageIter *i, const char *property, void *data) { | |
1004 | DBusMessageIter sub; | |
1005 | char **t = data; | |
1006 | ||
1007 | assert(m); | |
1008 | assert(i); | |
1009 | assert(property); | |
1010 | ||
1011 | if (!dbus_message_iter_open_container(i, DBUS_TYPE_ARRAY, "s", &sub)) | |
1012 | return -ENOMEM; | |
1013 | ||
1014 | STRV_FOREACH(t, t) | |
1015 | if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_STRING, t)) | |
1016 | return -ENOMEM; | |
1017 | ||
1018 | if (!dbus_message_iter_close_container(i, &sub)) | |
1019 | return -ENOMEM; | |
1020 | ||
1021 | return 0; | |
1022 | } | |
1023 | ||
1024 | int bus_property_append_bool(Manager *m, DBusMessageIter *i, const char *property, void *data) { | |
1025 | bool *b = data; | |
1026 | dbus_bool_t db; | |
1027 | ||
1028 | assert(m); | |
1029 | assert(i); | |
1030 | assert(property); | |
1031 | assert(b); | |
1032 | ||
1033 | db = *b; | |
1034 | ||
1035 | if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &db)) | |
1036 | return -ENOMEM; | |
1037 | ||
1038 | return 0; | |
1039 | } | |
1040 | ||
1041 | int bus_property_append_uint64(Manager *m, DBusMessageIter *i, const char *property, void *data) { | |
1042 | assert(m); | |
1043 | assert(i); | |
1044 | assert(property); | |
1045 | assert(data); | |
1046 | ||
1047 | /* Let's ensure that pid_t is actually 64bit, and hence this | |
1048 | * function can be used for usec_t */ | |
1049 | assert_cc(sizeof(uint64_t) == sizeof(usec_t)); | |
1050 | ||
1051 | if (!dbus_message_iter_append_basic(i, DBUS_TYPE_UINT64, data)) | |
1052 | return -ENOMEM; | |
1053 | ||
1054 | return 0; | |
1055 | } | |
1056 | ||
1057 | int bus_property_append_uint32(Manager *m, DBusMessageIter *i, const char *property, void *data) { | |
1058 | assert(m); | |
1059 | assert(i); | |
1060 | assert(property); | |
1061 | assert(data); | |
1062 | ||
1063 | /* Let's ensure that pid_t and mode_t is actually 32bit, and | |
1064 | * hence this function can be used for pid_t/mode_t */ | |
1065 | assert_cc(sizeof(uint32_t) == sizeof(pid_t)); | |
1066 | assert_cc(sizeof(uint32_t) == sizeof(mode_t)); | |
1067 | assert_cc(sizeof(uint32_t) == sizeof(unsigned)); | |
1068 | ||
1069 | if (!dbus_message_iter_append_basic(i, DBUS_TYPE_UINT32, data)) | |
1070 | return -ENOMEM; | |
1071 | ||
1072 | return 0; | |
1073 | } | |
1074 | ||
1075 | int bus_property_append_int32(Manager *m, DBusMessageIter *i, const char *property, void *data) { | |
1076 | assert(m); | |
1077 | assert(i); | |
1078 | assert(property); | |
1079 | assert(data); | |
1080 | ||
1081 | assert_cc(sizeof(int32_t) == sizeof(int)); | |
1082 | ||
1083 | if (!dbus_message_iter_append_basic(i, DBUS_TYPE_INT32, data)) | |
1084 | return -ENOMEM; | |
1085 | ||
1086 | return 0; | |
1087 | } |