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