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Merge pull request #8824 from keszybz/analyze-show-config
[thirdparty/systemd.git] / src / libsystemd / sd-bus / sd-bus.c
1 /* SPDX-License-Identifier: LGPL-2.1+ */
2 /***
3 This file is part of systemd.
4
5 Copyright 2013 Lennart Poettering
6 ***/
7
8 #include <endian.h>
9 #include <netdb.h>
10 #include <poll.h>
11 #include <pthread.h>
12 #include <signal.h>
13 #include <stdlib.h>
14 #include <sys/mman.h>
15 #include <sys/wait.h>
16 #include <unistd.h>
17
18 #include "sd-bus.h"
19
20 #include "alloc-util.h"
21 #include "bus-container.h"
22 #include "bus-control.h"
23 #include "bus-internal.h"
24 #include "bus-kernel.h"
25 #include "bus-label.h"
26 #include "bus-message.h"
27 #include "bus-objects.h"
28 #include "bus-protocol.h"
29 #include "bus-slot.h"
30 #include "bus-socket.h"
31 #include "bus-track.h"
32 #include "bus-type.h"
33 #include "bus-util.h"
34 #include "cgroup-util.h"
35 #include "def.h"
36 #include "fd-util.h"
37 #include "hexdecoct.h"
38 #include "hostname-util.h"
39 #include "macro.h"
40 #include "missing.h"
41 #include "parse-util.h"
42 #include "process-util.h"
43 #include "string-util.h"
44 #include "strv.h"
45 #include "util.h"
46
47 #define log_debug_bus_message(m) \
48 do { \
49 sd_bus_message *_mm = (m); \
50 log_debug("Got message type=%s sender=%s destination=%s path=%s interface=%s member=%s cookie=%" PRIu64 " reply_cookie=%" PRIu64 " signature=%s error-name=%s error-message=%s", \
51 bus_message_type_to_string(_mm->header->type), \
52 strna(sd_bus_message_get_sender(_mm)), \
53 strna(sd_bus_message_get_destination(_mm)), \
54 strna(sd_bus_message_get_path(_mm)), \
55 strna(sd_bus_message_get_interface(_mm)), \
56 strna(sd_bus_message_get_member(_mm)), \
57 BUS_MESSAGE_COOKIE(_mm), \
58 _mm->reply_cookie, \
59 strna(_mm->root_container.signature), \
60 strna(_mm->error.name), \
61 strna(_mm->error.message)); \
62 } while (false)
63
64 static int bus_poll(sd_bus *bus, bool need_more, uint64_t timeout_usec);
65 static void bus_detach_io_events(sd_bus *b);
66 static void bus_detach_inotify_event(sd_bus *b);
67
68 static thread_local sd_bus *default_system_bus = NULL;
69 static thread_local sd_bus *default_user_bus = NULL;
70 static thread_local sd_bus *default_starter_bus = NULL;
71
72 static sd_bus **bus_choose_default(int (**bus_open)(sd_bus **)) {
73 const char *e;
74
75 /* Let's try our best to reuse another cached connection. If
76 * the starter bus type is set, connect via our normal
77 * connection logic, ignoring $DBUS_STARTER_ADDRESS, so that
78 * we can share the connection with the user/system default
79 * bus. */
80
81 e = secure_getenv("DBUS_STARTER_BUS_TYPE");
82 if (e) {
83 if (streq(e, "system")) {
84 if (bus_open)
85 *bus_open = sd_bus_open_system;
86 return &default_system_bus;
87 } else if (STR_IN_SET(e, "user", "session")) {
88 if (bus_open)
89 *bus_open = sd_bus_open_user;
90 return &default_user_bus;
91 }
92 }
93
94 /* No type is specified, so we have not other option than to
95 * use the starter address if it is set. */
96 e = secure_getenv("DBUS_STARTER_ADDRESS");
97 if (e) {
98 if (bus_open)
99 *bus_open = sd_bus_open;
100 return &default_starter_bus;
101 }
102
103 /* Finally, if nothing is set use the cached connection for
104 * the right scope */
105
106 if (cg_pid_get_owner_uid(0, NULL) >= 0) {
107 if (bus_open)
108 *bus_open = sd_bus_open_user;
109 return &default_user_bus;
110 } else {
111 if (bus_open)
112 *bus_open = sd_bus_open_system;
113 return &default_system_bus;
114 }
115 }
116
117 sd_bus *bus_resolve(sd_bus *bus) {
118 switch ((uintptr_t) bus) {
119 case (uintptr_t) SD_BUS_DEFAULT:
120 return *(bus_choose_default(NULL));
121 case (uintptr_t) SD_BUS_DEFAULT_USER:
122 return default_user_bus;
123 case (uintptr_t) SD_BUS_DEFAULT_SYSTEM:
124 return default_system_bus;
125 default:
126 return bus;
127 }
128 }
129
130 void bus_close_io_fds(sd_bus *b) {
131 assert(b);
132
133 bus_detach_io_events(b);
134
135 if (b->input_fd != b->output_fd)
136 safe_close(b->output_fd);
137 b->output_fd = b->input_fd = safe_close(b->input_fd);
138 }
139
140 void bus_close_inotify_fd(sd_bus *b) {
141 assert(b);
142
143 bus_detach_inotify_event(b);
144
145 b->inotify_fd = safe_close(b->inotify_fd);
146 b->inotify_watches = mfree(b->inotify_watches);
147 b->n_inotify_watches = 0;
148 }
149
150 static void bus_reset_queues(sd_bus *b) {
151 assert(b);
152
153 while (b->rqueue_size > 0)
154 sd_bus_message_unref(b->rqueue[--b->rqueue_size]);
155
156 b->rqueue = mfree(b->rqueue);
157 b->rqueue_allocated = 0;
158
159 while (b->wqueue_size > 0)
160 sd_bus_message_unref(b->wqueue[--b->wqueue_size]);
161
162 b->wqueue = mfree(b->wqueue);
163 b->wqueue_allocated = 0;
164 }
165
166 static sd_bus* bus_free(sd_bus *b) {
167 sd_bus_slot *s;
168
169 assert(b);
170 assert(!b->track_queue);
171 assert(!b->tracks);
172
173 b->state = BUS_CLOSED;
174
175 sd_bus_detach_event(b);
176
177 while ((s = b->slots)) {
178 /* At this point only floating slots can still be
179 * around, because the non-floating ones keep a
180 * reference to the bus, and we thus couldn't be
181 * destructing right now... We forcibly disconnect the
182 * slots here, so that they still can be referenced by
183 * apps, but are dead. */
184
185 assert(s->floating);
186 bus_slot_disconnect(s);
187 sd_bus_slot_unref(s);
188 }
189
190 if (b->default_bus_ptr)
191 *b->default_bus_ptr = NULL;
192
193 bus_close_io_fds(b);
194 bus_close_inotify_fd(b);
195
196 free(b->label);
197 free(b->groups);
198 free(b->rbuffer);
199 free(b->unique_name);
200 free(b->auth_buffer);
201 free(b->address);
202 free(b->machine);
203 free(b->cgroup_root);
204 free(b->description);
205 free(b->patch_sender);
206
207 free(b->exec_path);
208 strv_free(b->exec_argv);
209
210 close_many(b->fds, b->n_fds);
211 free(b->fds);
212
213 bus_reset_queues(b);
214
215 ordered_hashmap_free_free(b->reply_callbacks);
216 prioq_free(b->reply_callbacks_prioq);
217
218 assert(b->match_callbacks.type == BUS_MATCH_ROOT);
219 bus_match_free(&b->match_callbacks);
220
221 hashmap_free_free(b->vtable_methods);
222 hashmap_free_free(b->vtable_properties);
223
224 assert(hashmap_isempty(b->nodes));
225 hashmap_free(b->nodes);
226
227 bus_flush_memfd(b);
228
229 assert_se(pthread_mutex_destroy(&b->memfd_cache_mutex) == 0);
230
231 return mfree(b);
232 }
233
234 DEFINE_TRIVIAL_CLEANUP_FUNC(sd_bus*, bus_free);
235
236 _public_ int sd_bus_new(sd_bus **ret) {
237 _cleanup_free_ sd_bus *b = NULL;
238
239 assert_return(ret, -EINVAL);
240
241 b = new0(sd_bus, 1);
242 if (!b)
243 return -ENOMEM;
244
245 b->n_ref = REFCNT_INIT;
246 b->input_fd = b->output_fd = -1;
247 b->inotify_fd = -1;
248 b->message_version = 1;
249 b->creds_mask |= SD_BUS_CREDS_WELL_KNOWN_NAMES|SD_BUS_CREDS_UNIQUE_NAME;
250 b->accept_fd = true;
251 b->original_pid = getpid_cached();
252 b->n_groups = (size_t) -1;
253
254 assert_se(pthread_mutex_init(&b->memfd_cache_mutex, NULL) == 0);
255
256 /* We guarantee that wqueue always has space for at least one entry */
257 if (!GREEDY_REALLOC(b->wqueue, b->wqueue_allocated, 1))
258 return -ENOMEM;
259
260 *ret = TAKE_PTR(b);
261 return 0;
262 }
263
264 _public_ int sd_bus_set_address(sd_bus *bus, const char *address) {
265 char *a;
266
267 assert_return(bus, -EINVAL);
268 assert_return(bus = bus_resolve(bus), -ENOPKG);
269 assert_return(bus->state == BUS_UNSET, -EPERM);
270 assert_return(address, -EINVAL);
271 assert_return(!bus_pid_changed(bus), -ECHILD);
272
273 a = strdup(address);
274 if (!a)
275 return -ENOMEM;
276
277 return free_and_replace(bus->address, a);
278 }
279
280 _public_ int sd_bus_set_fd(sd_bus *bus, int input_fd, int output_fd) {
281 assert_return(bus, -EINVAL);
282 assert_return(bus = bus_resolve(bus), -ENOPKG);
283 assert_return(bus->state == BUS_UNSET, -EPERM);
284 assert_return(input_fd >= 0, -EBADF);
285 assert_return(output_fd >= 0, -EBADF);
286 assert_return(!bus_pid_changed(bus), -ECHILD);
287
288 bus->input_fd = input_fd;
289 bus->output_fd = output_fd;
290 return 0;
291 }
292
293 _public_ int sd_bus_set_exec(sd_bus *bus, const char *path, char *const argv[]) {
294 _cleanup_free_ char *p = NULL;
295 char **a;
296
297 assert_return(bus, -EINVAL);
298 assert_return(bus = bus_resolve(bus), -ENOPKG);
299 assert_return(bus->state == BUS_UNSET, -EPERM);
300 assert_return(path, -EINVAL);
301 assert_return(!strv_isempty(argv), -EINVAL);
302 assert_return(!bus_pid_changed(bus), -ECHILD);
303
304 p = strdup(path);
305 if (!p)
306 return -ENOMEM;
307
308 a = strv_copy(argv);
309 if (!a)
310 return -ENOMEM;
311
312 free_and_replace(bus->exec_path, p);
313 strv_free_and_replace(bus->exec_argv, a);
314 return 0;
315 }
316
317 _public_ int sd_bus_set_bus_client(sd_bus *bus, int b) {
318 assert_return(bus, -EINVAL);
319 assert_return(bus = bus_resolve(bus), -ENOPKG);
320 assert_return(bus->state == BUS_UNSET, -EPERM);
321 assert_return(!bus->patch_sender, -EPERM);
322 assert_return(!bus_pid_changed(bus), -ECHILD);
323
324 bus->bus_client = !!b;
325 return 0;
326 }
327
328 _public_ int sd_bus_set_monitor(sd_bus *bus, int b) {
329 assert_return(bus, -EINVAL);
330 assert_return(bus = bus_resolve(bus), -ENOPKG);
331 assert_return(bus->state == BUS_UNSET, -EPERM);
332 assert_return(!bus_pid_changed(bus), -ECHILD);
333
334 bus->is_monitor = !!b;
335 return 0;
336 }
337
338 _public_ int sd_bus_negotiate_fds(sd_bus *bus, int b) {
339 assert_return(bus, -EINVAL);
340 assert_return(bus = bus_resolve(bus), -ENOPKG);
341 assert_return(bus->state == BUS_UNSET, -EPERM);
342 assert_return(!bus_pid_changed(bus), -ECHILD);
343
344 bus->accept_fd = !!b;
345 return 0;
346 }
347
348 _public_ int sd_bus_negotiate_timestamp(sd_bus *bus, int b) {
349 assert_return(bus, -EINVAL);
350 assert_return(bus = bus_resolve(bus), -ENOPKG);
351 assert_return(!IN_SET(bus->state, BUS_CLOSING, BUS_CLOSED), -EPERM);
352 assert_return(!bus_pid_changed(bus), -ECHILD);
353
354 /* This is not actually supported by any of our transports these days, but we do honour it for synthetic
355 * replies, and maybe one day classic D-Bus learns this too */
356 bus->attach_timestamp = !!b;
357
358 return 0;
359 }
360
361 _public_ int sd_bus_negotiate_creds(sd_bus *bus, int b, uint64_t mask) {
362 assert_return(bus, -EINVAL);
363 assert_return(bus = bus_resolve(bus), -ENOPKG);
364 assert_return(mask <= _SD_BUS_CREDS_ALL, -EINVAL);
365 assert_return(!IN_SET(bus->state, BUS_CLOSING, BUS_CLOSED), -EPERM);
366 assert_return(!bus_pid_changed(bus), -ECHILD);
367
368 SET_FLAG(bus->creds_mask, mask, b);
369
370 /* The well knowns we need unconditionally, so that matches can work */
371 bus->creds_mask |= SD_BUS_CREDS_WELL_KNOWN_NAMES|SD_BUS_CREDS_UNIQUE_NAME;
372
373 return 0;
374 }
375
376 _public_ int sd_bus_set_server(sd_bus *bus, int b, sd_id128_t server_id) {
377 assert_return(bus, -EINVAL);
378 assert_return(bus = bus_resolve(bus), -ENOPKG);
379 assert_return(b || sd_id128_equal(server_id, SD_ID128_NULL), -EINVAL);
380 assert_return(bus->state == BUS_UNSET, -EPERM);
381 assert_return(!bus_pid_changed(bus), -ECHILD);
382
383 bus->is_server = !!b;
384 bus->server_id = server_id;
385 return 0;
386 }
387
388 _public_ int sd_bus_set_anonymous(sd_bus *bus, int b) {
389 assert_return(bus, -EINVAL);
390 assert_return(bus = bus_resolve(bus), -ENOPKG);
391 assert_return(bus->state == BUS_UNSET, -EPERM);
392 assert_return(!bus_pid_changed(bus), -ECHILD);
393
394 bus->anonymous_auth = !!b;
395 return 0;
396 }
397
398 _public_ int sd_bus_set_trusted(sd_bus *bus, int b) {
399 assert_return(bus, -EINVAL);
400 assert_return(bus = bus_resolve(bus), -ENOPKG);
401 assert_return(bus->state == BUS_UNSET, -EPERM);
402 assert_return(!bus_pid_changed(bus), -ECHILD);
403
404 bus->trusted = !!b;
405 return 0;
406 }
407
408 _public_ int sd_bus_set_description(sd_bus *bus, const char *description) {
409 assert_return(bus, -EINVAL);
410 assert_return(bus = bus_resolve(bus), -ENOPKG);
411 assert_return(bus->state == BUS_UNSET, -EPERM);
412 assert_return(!bus_pid_changed(bus), -ECHILD);
413
414 return free_and_strdup(&bus->description, description);
415 }
416
417 _public_ int sd_bus_set_allow_interactive_authorization(sd_bus *bus, int b) {
418 assert_return(bus, -EINVAL);
419 assert_return(bus = bus_resolve(bus), -ENOPKG);
420 assert_return(!bus_pid_changed(bus), -ECHILD);
421
422 bus->allow_interactive_authorization = !!b;
423 return 0;
424 }
425
426 _public_ int sd_bus_get_allow_interactive_authorization(sd_bus *bus) {
427 assert_return(bus, -EINVAL);
428 assert_return(bus = bus_resolve(bus), -ENOPKG);
429 assert_return(!bus_pid_changed(bus), -ECHILD);
430
431 return bus->allow_interactive_authorization;
432 }
433
434 _public_ int sd_bus_set_watch_bind(sd_bus *bus, int b) {
435 assert_return(bus, -EINVAL);
436 assert_return(bus = bus_resolve(bus), -ENOPKG);
437 assert_return(bus->state == BUS_UNSET, -EPERM);
438 assert_return(!bus_pid_changed(bus), -ECHILD);
439
440 bus->watch_bind = !!b;
441 return 0;
442 }
443
444 _public_ int sd_bus_get_watch_bind(sd_bus *bus) {
445 assert_return(bus, -EINVAL);
446 assert_return(bus = bus_resolve(bus), -ENOPKG);
447 assert_return(!bus_pid_changed(bus), -ECHILD);
448
449 return bus->watch_bind;
450 }
451
452 _public_ int sd_bus_set_connected_signal(sd_bus *bus, int b) {
453 assert_return(bus, -EINVAL);
454 assert_return(bus = bus_resolve(bus), -ENOPKG);
455 assert_return(bus->state == BUS_UNSET, -EPERM);
456 assert_return(!bus_pid_changed(bus), -ECHILD);
457
458 bus->connected_signal = !!b;
459 return 0;
460 }
461
462 _public_ int sd_bus_get_connected_signal(sd_bus *bus) {
463 assert_return(bus, -EINVAL);
464 assert_return(bus = bus_resolve(bus), -ENOPKG);
465 assert_return(!bus_pid_changed(bus), -ECHILD);
466
467 return bus->connected_signal;
468 }
469
470 static int synthesize_connected_signal(sd_bus *bus) {
471 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
472 int r;
473
474 assert(bus);
475
476 /* If enabled, synthesizes a local "Connected" signal mirroring the local "Disconnected" signal. This is called
477 * whenever we fully established a connection, i.e. after the authorization phase, and after receiving the
478 * Hello() reply. Or in other words, whenver we enter BUS_RUNNING state.
479 *
480 * This is useful so that clients can start doing stuff whenver the connection is fully established in a way
481 * that works independently from whether we connected to a full bus or just a direct connection. */
482
483 if (!bus->connected_signal)
484 return 0;
485
486 r = sd_bus_message_new_signal(
487 bus,
488 &m,
489 "/org/freedesktop/DBus/Local",
490 "org.freedesktop.DBus.Local",
491 "Connected");
492 if (r < 0)
493 return r;
494
495 bus_message_set_sender_local(bus, m);
496
497 r = bus_seal_synthetic_message(bus, m);
498 if (r < 0)
499 return r;
500
501 r = bus_rqueue_make_room(bus);
502 if (r < 0)
503 return r;
504
505 /* Insert at the very front */
506 memmove(bus->rqueue + 1, bus->rqueue, sizeof(sd_bus_message*) * bus->rqueue_size);
507 bus->rqueue[0] = TAKE_PTR(m);
508 bus->rqueue_size++;
509
510 return 0;
511 }
512
513 void bus_set_state(sd_bus *bus, enum bus_state state) {
514
515 static const char * const table[_BUS_STATE_MAX] = {
516 [BUS_UNSET] = "UNSET",
517 [BUS_WATCH_BIND] = "WATCH_BIND",
518 [BUS_OPENING] = "OPENING",
519 [BUS_AUTHENTICATING] = "AUTHENTICATING",
520 [BUS_HELLO] = "HELLO",
521 [BUS_RUNNING] = "RUNNING",
522 [BUS_CLOSING] = "CLOSING",
523 [BUS_CLOSED] = "CLOSED",
524 };
525
526 assert(bus);
527 assert(state < _BUS_STATE_MAX);
528
529 if (state == bus->state)
530 return;
531
532 log_debug("Bus %s: changing state %s → %s", strna(bus->description), table[bus->state], table[state]);
533 bus->state = state;
534 }
535
536 static int hello_callback(sd_bus_message *reply, void *userdata, sd_bus_error *error) {
537 const char *s;
538 char *t;
539 sd_bus *bus;
540 int r;
541
542 assert(reply);
543 bus = reply->bus;
544 assert(bus);
545 assert(IN_SET(bus->state, BUS_HELLO, BUS_CLOSING));
546
547 r = sd_bus_message_get_errno(reply);
548 if (r > 0)
549 return -r;
550
551 r = sd_bus_message_read(reply, "s", &s);
552 if (r < 0)
553 return r;
554
555 if (!service_name_is_valid(s) || s[0] != ':')
556 return -EBADMSG;
557
558 t = strdup(s);
559 if (!t)
560 return -ENOMEM;
561
562 free_and_replace(bus->unique_name, t);
563
564 if (bus->state == BUS_HELLO) {
565 bus_set_state(bus, BUS_RUNNING);
566
567 r = synthesize_connected_signal(bus);
568 if (r < 0)
569 return r;
570 }
571
572 return 1;
573 }
574
575 static int bus_send_hello(sd_bus *bus) {
576 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
577 int r;
578
579 assert(bus);
580
581 if (!bus->bus_client)
582 return 0;
583
584 r = sd_bus_message_new_method_call(
585 bus,
586 &m,
587 "org.freedesktop.DBus",
588 "/org/freedesktop/DBus",
589 "org.freedesktop.DBus",
590 "Hello");
591 if (r < 0)
592 return r;
593
594 return sd_bus_call_async(bus, NULL, m, hello_callback, NULL, 0);
595 }
596
597 int bus_start_running(sd_bus *bus) {
598 struct reply_callback *c;
599 Iterator i;
600 usec_t n;
601 int r;
602
603 assert(bus);
604 assert(bus->state < BUS_HELLO);
605
606 /* We start all method call timeouts when we enter BUS_HELLO or BUS_RUNNING mode. At this point let's convert
607 * all relative to absolute timestamps. Note that we do not reshuffle the reply callback priority queue since
608 * adding a fixed value to all entries should not alter the internal order. */
609
610 n = now(CLOCK_MONOTONIC);
611 ORDERED_HASHMAP_FOREACH(c, bus->reply_callbacks, i) {
612 if (c->timeout_usec == 0)
613 continue;
614
615 c->timeout_usec = usec_add(n, c->timeout_usec);
616 }
617
618 if (bus->bus_client) {
619 bus_set_state(bus, BUS_HELLO);
620 return 1;
621 }
622
623 bus_set_state(bus, BUS_RUNNING);
624
625 r = synthesize_connected_signal(bus);
626 if (r < 0)
627 return r;
628
629 return 1;
630 }
631
632 static int parse_address_key(const char **p, const char *key, char **value) {
633 size_t l, n = 0, allocated = 0;
634 _cleanup_free_ char *r = NULL;
635 const char *a;
636
637 assert(p);
638 assert(*p);
639 assert(value);
640
641 if (key) {
642 l = strlen(key);
643 if (strncmp(*p, key, l) != 0)
644 return 0;
645
646 if ((*p)[l] != '=')
647 return 0;
648
649 if (*value)
650 return -EINVAL;
651
652 a = *p + l + 1;
653 } else
654 a = *p;
655
656 while (!IN_SET(*a, ';', ',', 0)) {
657 char c;
658
659 if (*a == '%') {
660 int x, y;
661
662 x = unhexchar(a[1]);
663 if (x < 0)
664 return x;
665
666 y = unhexchar(a[2]);
667 if (y < 0)
668 return y;
669
670 c = (char) ((x << 4) | y);
671 a += 3;
672 } else {
673 c = *a;
674 a++;
675 }
676
677 if (!GREEDY_REALLOC(r, allocated, n + 2))
678 return -ENOMEM;
679
680 r[n++] = c;
681 }
682
683 if (!r) {
684 r = strdup("");
685 if (!r)
686 return -ENOMEM;
687 } else
688 r[n] = 0;
689
690 if (*a == ',')
691 a++;
692
693 *p = a;
694
695 free_and_replace(*value, r);
696
697 return 1;
698 }
699
700 static void skip_address_key(const char **p) {
701 assert(p);
702 assert(*p);
703
704 *p += strcspn(*p, ",");
705
706 if (**p == ',')
707 (*p)++;
708 }
709
710 static int parse_unix_address(sd_bus *b, const char **p, char **guid) {
711 _cleanup_free_ char *path = NULL, *abstract = NULL;
712 size_t l;
713 int r;
714
715 assert(b);
716 assert(p);
717 assert(*p);
718 assert(guid);
719
720 while (!IN_SET(**p, 0, ';')) {
721 r = parse_address_key(p, "guid", guid);
722 if (r < 0)
723 return r;
724 else if (r > 0)
725 continue;
726
727 r = parse_address_key(p, "path", &path);
728 if (r < 0)
729 return r;
730 else if (r > 0)
731 continue;
732
733 r = parse_address_key(p, "abstract", &abstract);
734 if (r < 0)
735 return r;
736 else if (r > 0)
737 continue;
738
739 skip_address_key(p);
740 }
741
742 if (!path && !abstract)
743 return -EINVAL;
744
745 if (path && abstract)
746 return -EINVAL;
747
748 if (path) {
749 l = strlen(path);
750 if (l > sizeof(b->sockaddr.un.sun_path))
751 return -E2BIG;
752
753 b->sockaddr.un.sun_family = AF_UNIX;
754 strncpy(b->sockaddr.un.sun_path, path, sizeof(b->sockaddr.un.sun_path));
755 b->sockaddr_size = offsetof(struct sockaddr_un, sun_path) + l;
756 } else if (abstract) {
757 l = strlen(abstract);
758 if (l > sizeof(b->sockaddr.un.sun_path) - 1)
759 return -E2BIG;
760
761 b->sockaddr.un.sun_family = AF_UNIX;
762 b->sockaddr.un.sun_path[0] = 0;
763 strncpy(b->sockaddr.un.sun_path+1, abstract, sizeof(b->sockaddr.un.sun_path)-1);
764 b->sockaddr_size = offsetof(struct sockaddr_un, sun_path) + 1 + l;
765 }
766
767 b->is_local = true;
768
769 return 0;
770 }
771
772 static int parse_tcp_address(sd_bus *b, const char **p, char **guid) {
773 _cleanup_free_ char *host = NULL, *port = NULL, *family = NULL;
774 int r;
775 struct addrinfo *result, hints = {
776 .ai_socktype = SOCK_STREAM,
777 .ai_flags = AI_ADDRCONFIG,
778 };
779
780 assert(b);
781 assert(p);
782 assert(*p);
783 assert(guid);
784
785 while (!IN_SET(**p, 0, ';')) {
786 r = parse_address_key(p, "guid", guid);
787 if (r < 0)
788 return r;
789 else if (r > 0)
790 continue;
791
792 r = parse_address_key(p, "host", &host);
793 if (r < 0)
794 return r;
795 else if (r > 0)
796 continue;
797
798 r = parse_address_key(p, "port", &port);
799 if (r < 0)
800 return r;
801 else if (r > 0)
802 continue;
803
804 r = parse_address_key(p, "family", &family);
805 if (r < 0)
806 return r;
807 else if (r > 0)
808 continue;
809
810 skip_address_key(p);
811 }
812
813 if (!host || !port)
814 return -EINVAL;
815
816 if (family) {
817 if (streq(family, "ipv4"))
818 hints.ai_family = AF_INET;
819 else if (streq(family, "ipv6"))
820 hints.ai_family = AF_INET6;
821 else
822 return -EINVAL;
823 }
824
825 r = getaddrinfo(host, port, &hints, &result);
826 if (r == EAI_SYSTEM)
827 return -errno;
828 else if (r != 0)
829 return -EADDRNOTAVAIL;
830
831 memcpy(&b->sockaddr, result->ai_addr, result->ai_addrlen);
832 b->sockaddr_size = result->ai_addrlen;
833
834 freeaddrinfo(result);
835
836 b->is_local = false;
837
838 return 0;
839 }
840
841 static int parse_exec_address(sd_bus *b, const char **p, char **guid) {
842 char *path = NULL;
843 unsigned n_argv = 0, j;
844 char **argv = NULL;
845 size_t allocated = 0;
846 int r;
847
848 assert(b);
849 assert(p);
850 assert(*p);
851 assert(guid);
852
853 while (!IN_SET(**p, 0, ';')) {
854 r = parse_address_key(p, "guid", guid);
855 if (r < 0)
856 goto fail;
857 else if (r > 0)
858 continue;
859
860 r = parse_address_key(p, "path", &path);
861 if (r < 0)
862 goto fail;
863 else if (r > 0)
864 continue;
865
866 if (startswith(*p, "argv")) {
867 unsigned ul;
868
869 errno = 0;
870 ul = strtoul(*p + 4, (char**) p, 10);
871 if (errno > 0 || **p != '=' || ul > 256) {
872 r = -EINVAL;
873 goto fail;
874 }
875
876 (*p)++;
877
878 if (ul >= n_argv) {
879 if (!GREEDY_REALLOC0(argv, allocated, ul + 2)) {
880 r = -ENOMEM;
881 goto fail;
882 }
883
884 n_argv = ul + 1;
885 }
886
887 r = parse_address_key(p, NULL, argv + ul);
888 if (r < 0)
889 goto fail;
890
891 continue;
892 }
893
894 skip_address_key(p);
895 }
896
897 if (!path) {
898 r = -EINVAL;
899 goto fail;
900 }
901
902 /* Make sure there are no holes in the array, with the
903 * exception of argv[0] */
904 for (j = 1; j < n_argv; j++)
905 if (!argv[j]) {
906 r = -EINVAL;
907 goto fail;
908 }
909
910 if (argv && argv[0] == NULL) {
911 argv[0] = strdup(path);
912 if (!argv[0]) {
913 r = -ENOMEM;
914 goto fail;
915 }
916 }
917
918 b->exec_path = path;
919 b->exec_argv = argv;
920
921 b->is_local = false;
922
923 return 0;
924
925 fail:
926 for (j = 0; j < n_argv; j++)
927 free(argv[j]);
928
929 free(argv);
930 free(path);
931 return r;
932 }
933
934 static int parse_container_unix_address(sd_bus *b, const char **p, char **guid) {
935 _cleanup_free_ char *machine = NULL, *pid = NULL;
936 int r;
937
938 assert(b);
939 assert(p);
940 assert(*p);
941 assert(guid);
942
943 while (!IN_SET(**p, 0, ';')) {
944 r = parse_address_key(p, "guid", guid);
945 if (r < 0)
946 return r;
947 else if (r > 0)
948 continue;
949
950 r = parse_address_key(p, "machine", &machine);
951 if (r < 0)
952 return r;
953 else if (r > 0)
954 continue;
955
956 r = parse_address_key(p, "pid", &pid);
957 if (r < 0)
958 return r;
959 else if (r > 0)
960 continue;
961
962 skip_address_key(p);
963 }
964
965 if (!machine == !pid)
966 return -EINVAL;
967
968 if (machine) {
969 if (!machine_name_is_valid(machine))
970 return -EINVAL;
971
972 free_and_replace(b->machine, machine);
973 } else {
974 b->machine = mfree(b->machine);
975 }
976
977 if (pid) {
978 r = parse_pid(pid, &b->nspid);
979 if (r < 0)
980 return r;
981 } else
982 b->nspid = 0;
983
984 b->sockaddr.un.sun_family = AF_UNIX;
985 /* Note that we use the old /var/run prefix here, to increase compatibility with really old containers */
986 strncpy(b->sockaddr.un.sun_path, "/var/run/dbus/system_bus_socket", sizeof(b->sockaddr.un.sun_path));
987 b->sockaddr_size = SOCKADDR_UN_LEN(b->sockaddr.un);
988 b->is_local = false;
989
990 return 0;
991 }
992
993 static void bus_reset_parsed_address(sd_bus *b) {
994 assert(b);
995
996 zero(b->sockaddr);
997 b->sockaddr_size = 0;
998 b->exec_argv = strv_free(b->exec_argv);
999 b->exec_path = mfree(b->exec_path);
1000 b->server_id = SD_ID128_NULL;
1001 b->machine = mfree(b->machine);
1002 b->nspid = 0;
1003 }
1004
1005 static int bus_parse_next_address(sd_bus *b) {
1006 _cleanup_free_ char *guid = NULL;
1007 const char *a;
1008 int r;
1009
1010 assert(b);
1011
1012 if (!b->address)
1013 return 0;
1014 if (b->address[b->address_index] == 0)
1015 return 0;
1016
1017 bus_reset_parsed_address(b);
1018
1019 a = b->address + b->address_index;
1020
1021 while (*a != 0) {
1022
1023 if (*a == ';') {
1024 a++;
1025 continue;
1026 }
1027
1028 if (startswith(a, "unix:")) {
1029 a += 5;
1030
1031 r = parse_unix_address(b, &a, &guid);
1032 if (r < 0)
1033 return r;
1034 break;
1035
1036 } else if (startswith(a, "tcp:")) {
1037
1038 a += 4;
1039 r = parse_tcp_address(b, &a, &guid);
1040 if (r < 0)
1041 return r;
1042
1043 break;
1044
1045 } else if (startswith(a, "unixexec:")) {
1046
1047 a += 9;
1048 r = parse_exec_address(b, &a, &guid);
1049 if (r < 0)
1050 return r;
1051
1052 break;
1053
1054 } else if (startswith(a, "x-machine-unix:")) {
1055
1056 a += 15;
1057 r = parse_container_unix_address(b, &a, &guid);
1058 if (r < 0)
1059 return r;
1060
1061 break;
1062 }
1063
1064 a = strchr(a, ';');
1065 if (!a)
1066 return 0;
1067 }
1068
1069 if (guid) {
1070 r = sd_id128_from_string(guid, &b->server_id);
1071 if (r < 0)
1072 return r;
1073 }
1074
1075 b->address_index = a - b->address;
1076 return 1;
1077 }
1078
1079 static void bus_kill_exec(sd_bus *bus) {
1080 if (pid_is_valid(bus->busexec_pid) > 0) {
1081 sigterm_wait(bus->busexec_pid);
1082 bus->busexec_pid = 0;
1083 }
1084 }
1085
1086 static int bus_start_address(sd_bus *b) {
1087 int r;
1088
1089 assert(b);
1090
1091 for (;;) {
1092 bus_close_io_fds(b);
1093 bus_close_inotify_fd(b);
1094
1095 bus_kill_exec(b);
1096
1097 /* If you provide multiple different bus-addresses, we
1098 * try all of them in order and use the first one that
1099 * succeeds. */
1100
1101 if (b->exec_path)
1102 r = bus_socket_exec(b);
1103 else if ((b->nspid > 0 || b->machine) && b->sockaddr.sa.sa_family != AF_UNSPEC)
1104 r = bus_container_connect_socket(b);
1105 else if (b->sockaddr.sa.sa_family != AF_UNSPEC)
1106 r = bus_socket_connect(b);
1107 else
1108 goto next;
1109
1110 if (r >= 0) {
1111 int q;
1112
1113 q = bus_attach_io_events(b);
1114 if (q < 0)
1115 return q;
1116
1117 q = bus_attach_inotify_event(b);
1118 if (q < 0)
1119 return q;
1120
1121 return r;
1122 }
1123
1124 b->last_connect_error = -r;
1125
1126 next:
1127 r = bus_parse_next_address(b);
1128 if (r < 0)
1129 return r;
1130 if (r == 0)
1131 return b->last_connect_error > 0 ? -b->last_connect_error : -ECONNREFUSED;
1132 }
1133 }
1134
1135 int bus_next_address(sd_bus *b) {
1136 assert(b);
1137
1138 bus_reset_parsed_address(b);
1139 return bus_start_address(b);
1140 }
1141
1142 static int bus_start_fd(sd_bus *b) {
1143 struct stat st;
1144 int r;
1145
1146 assert(b);
1147 assert(b->input_fd >= 0);
1148 assert(b->output_fd >= 0);
1149
1150 r = fd_nonblock(b->input_fd, true);
1151 if (r < 0)
1152 return r;
1153
1154 r = fd_cloexec(b->input_fd, true);
1155 if (r < 0)
1156 return r;
1157
1158 if (b->input_fd != b->output_fd) {
1159 r = fd_nonblock(b->output_fd, true);
1160 if (r < 0)
1161 return r;
1162
1163 r = fd_cloexec(b->output_fd, true);
1164 if (r < 0)
1165 return r;
1166 }
1167
1168 if (fstat(b->input_fd, &st) < 0)
1169 return -errno;
1170
1171 return bus_socket_take_fd(b);
1172 }
1173
1174 _public_ int sd_bus_start(sd_bus *bus) {
1175 int r;
1176
1177 assert_return(bus, -EINVAL);
1178 assert_return(bus = bus_resolve(bus), -ENOPKG);
1179 assert_return(bus->state == BUS_UNSET, -EPERM);
1180 assert_return(!bus_pid_changed(bus), -ECHILD);
1181
1182 bus_set_state(bus, BUS_OPENING);
1183
1184 if (bus->is_server && bus->bus_client)
1185 return -EINVAL;
1186
1187 if (bus->input_fd >= 0)
1188 r = bus_start_fd(bus);
1189 else if (bus->address || bus->sockaddr.sa.sa_family != AF_UNSPEC || bus->exec_path || bus->machine)
1190 r = bus_start_address(bus);
1191 else
1192 return -EINVAL;
1193
1194 if (r < 0) {
1195 sd_bus_close(bus);
1196 return r;
1197 }
1198
1199 return bus_send_hello(bus);
1200 }
1201
1202 _public_ int sd_bus_open_with_description(sd_bus **ret, const char *description) {
1203 const char *e;
1204 _cleanup_(bus_freep) sd_bus *b = NULL;
1205 int r;
1206
1207 assert_return(ret, -EINVAL);
1208
1209 /* Let's connect to the starter bus if it is set, and
1210 * otherwise to the bus that is appropropriate for the scope
1211 * we are running in */
1212
1213 e = secure_getenv("DBUS_STARTER_BUS_TYPE");
1214 if (e) {
1215 if (streq(e, "system"))
1216 return sd_bus_open_system_with_description(ret, description);
1217 else if (STR_IN_SET(e, "session", "user"))
1218 return sd_bus_open_user_with_description(ret, description);
1219 }
1220
1221 e = secure_getenv("DBUS_STARTER_ADDRESS");
1222 if (!e) {
1223 if (cg_pid_get_owner_uid(0, NULL) >= 0)
1224 return sd_bus_open_user_with_description(ret, description);
1225 else
1226 return sd_bus_open_system_with_description(ret, description);
1227 }
1228
1229 r = sd_bus_new(&b);
1230 if (r < 0)
1231 return r;
1232
1233 r = sd_bus_set_address(b, e);
1234 if (r < 0)
1235 return r;
1236
1237 b->bus_client = true;
1238
1239 /* We don't know whether the bus is trusted or not, so better
1240 * be safe, and authenticate everything */
1241 b->trusted = false;
1242 b->is_local = false;
1243 b->creds_mask |= SD_BUS_CREDS_UID | SD_BUS_CREDS_EUID | SD_BUS_CREDS_EFFECTIVE_CAPS;
1244
1245 r = sd_bus_start(b);
1246 if (r < 0)
1247 return r;
1248
1249 *ret = TAKE_PTR(b);
1250 return 0;
1251 }
1252
1253 _public_ int sd_bus_open(sd_bus **ret) {
1254 return sd_bus_open_with_description(ret, NULL);
1255 }
1256
1257 int bus_set_address_system(sd_bus *b) {
1258 const char *e;
1259 assert(b);
1260
1261 e = secure_getenv("DBUS_SYSTEM_BUS_ADDRESS");
1262 if (e)
1263 return sd_bus_set_address(b, e);
1264
1265 return sd_bus_set_address(b, DEFAULT_SYSTEM_BUS_ADDRESS);
1266 }
1267
1268 _public_ int sd_bus_open_system_with_description(sd_bus **ret, const char *description) {
1269 _cleanup_(bus_freep) sd_bus *b = NULL;
1270 int r;
1271
1272 assert_return(ret, -EINVAL);
1273
1274 r = sd_bus_new(&b);
1275 if (r < 0)
1276 return r;
1277
1278 if (description) {
1279 r = sd_bus_set_description(b, description);
1280 if (r < 0)
1281 return r;
1282 }
1283
1284 r = bus_set_address_system(b);
1285 if (r < 0)
1286 return r;
1287
1288 b->bus_client = true;
1289 b->is_system = true;
1290
1291 /* Let's do per-method access control on the system bus. We
1292 * need the caller's UID and capability set for that. */
1293 b->trusted = false;
1294 b->creds_mask |= SD_BUS_CREDS_UID | SD_BUS_CREDS_EUID | SD_BUS_CREDS_EFFECTIVE_CAPS;
1295 b->is_local = true;
1296
1297 r = sd_bus_start(b);
1298 if (r < 0)
1299 return r;
1300
1301 *ret = TAKE_PTR(b);
1302 return 0;
1303 }
1304
1305 _public_ int sd_bus_open_system(sd_bus **ret) {
1306 return sd_bus_open_system_with_description(ret, NULL);
1307 }
1308
1309 int bus_set_address_user(sd_bus *b) {
1310 const char *e;
1311 _cleanup_free_ char *ee = NULL, *s = NULL;
1312
1313 assert(b);
1314
1315 e = secure_getenv("DBUS_SESSION_BUS_ADDRESS");
1316 if (e)
1317 return sd_bus_set_address(b, e);
1318
1319 e = secure_getenv("XDG_RUNTIME_DIR");
1320 if (!e)
1321 return -ENOENT;
1322
1323 ee = bus_address_escape(e);
1324 if (!ee)
1325 return -ENOMEM;
1326
1327 if (asprintf(&s, DEFAULT_USER_BUS_ADDRESS_FMT, ee) < 0)
1328 return -ENOMEM;
1329
1330 b->address = TAKE_PTR(s);
1331
1332 return 0;
1333 }
1334
1335 _public_ int sd_bus_open_user_with_description(sd_bus **ret, const char *description) {
1336 _cleanup_(bus_freep) sd_bus *b = NULL;
1337 int r;
1338
1339 assert_return(ret, -EINVAL);
1340
1341 r = sd_bus_new(&b);
1342 if (r < 0)
1343 return r;
1344
1345 if (description) {
1346 r = sd_bus_set_description(b, description);
1347 if (r < 0)
1348 return r;
1349 }
1350
1351 r = bus_set_address_user(b);
1352 if (r < 0)
1353 return r;
1354
1355 b->bus_client = true;
1356 b->is_user = true;
1357
1358 /* We don't do any per-method access control on the user
1359 * bus. */
1360 b->trusted = true;
1361 b->is_local = true;
1362
1363 r = sd_bus_start(b);
1364 if (r < 0)
1365 return r;
1366
1367 *ret = TAKE_PTR(b);
1368 return 0;
1369 }
1370
1371 _public_ int sd_bus_open_user(sd_bus **ret) {
1372 return sd_bus_open_user_with_description(ret, NULL);
1373 }
1374
1375 int bus_set_address_system_remote(sd_bus *b, const char *host) {
1376 _cleanup_free_ char *e = NULL;
1377 char *m = NULL, *c = NULL, *a;
1378
1379 assert(b);
1380 assert(host);
1381
1382 /* Let's see if we shall enter some container */
1383 m = strchr(host, ':');
1384 if (m) {
1385 m++;
1386
1387 /* Let's make sure this is not a port of some kind,
1388 * and is a valid machine name. */
1389 if (!in_charset(m, DIGITS) && machine_name_is_valid(m)) {
1390 char *t;
1391
1392 /* Cut out the host part */
1393 t = strndupa(host, m - host - 1);
1394 e = bus_address_escape(t);
1395 if (!e)
1396 return -ENOMEM;
1397
1398 c = strjoina(",argv5=--machine=", m);
1399 }
1400 }
1401
1402 if (!e) {
1403 e = bus_address_escape(host);
1404 if (!e)
1405 return -ENOMEM;
1406 }
1407
1408 a = strjoin("unixexec:path=ssh,argv1=-xT,argv2=--,argv3=", e, ",argv4=systemd-stdio-bridge", c);
1409 if (!a)
1410 return -ENOMEM;
1411
1412 return free_and_replace(b->address, a);
1413 }
1414
1415 _public_ int sd_bus_open_system_remote(sd_bus **ret, const char *host) {
1416 _cleanup_(bus_freep) sd_bus *b = NULL;
1417 int r;
1418
1419 assert_return(host, -EINVAL);
1420 assert_return(ret, -EINVAL);
1421
1422 r = sd_bus_new(&b);
1423 if (r < 0)
1424 return r;
1425
1426 r = bus_set_address_system_remote(b, host);
1427 if (r < 0)
1428 return r;
1429
1430 b->bus_client = true;
1431 b->trusted = false;
1432 b->is_system = true;
1433 b->is_local = false;
1434
1435 r = sd_bus_start(b);
1436 if (r < 0)
1437 return r;
1438
1439 *ret = TAKE_PTR(b);
1440 return 0;
1441 }
1442
1443 int bus_set_address_system_machine(sd_bus *b, const char *machine) {
1444 _cleanup_free_ char *e = NULL;
1445 char *a;
1446
1447 assert(b);
1448 assert(machine);
1449
1450 e = bus_address_escape(machine);
1451 if (!e)
1452 return -ENOMEM;
1453
1454 a = strjoin("x-machine-unix:machine=", e);
1455 if (!a)
1456 return -ENOMEM;
1457
1458 return free_and_replace(b->address, a);
1459 }
1460
1461 _public_ int sd_bus_open_system_machine(sd_bus **ret, const char *machine) {
1462 _cleanup_(bus_freep) sd_bus *b = NULL;
1463 int r;
1464
1465 assert_return(machine, -EINVAL);
1466 assert_return(ret, -EINVAL);
1467 assert_return(machine_name_is_valid(machine), -EINVAL);
1468
1469 r = sd_bus_new(&b);
1470 if (r < 0)
1471 return r;
1472
1473 r = bus_set_address_system_machine(b, machine);
1474 if (r < 0)
1475 return r;
1476
1477 b->bus_client = true;
1478 b->trusted = false;
1479 b->is_system = true;
1480 b->is_local = false;
1481
1482 r = sd_bus_start(b);
1483 if (r < 0)
1484 return r;
1485
1486 *ret = TAKE_PTR(b);
1487 return 0;
1488 }
1489
1490 _public_ void sd_bus_close(sd_bus *bus) {
1491 if (!bus)
1492 return;
1493 if (bus->state == BUS_CLOSED)
1494 return;
1495 if (bus_pid_changed(bus))
1496 return;
1497
1498 /* Don't leave ssh hanging around */
1499 bus_kill_exec(bus);
1500
1501 bus_set_state(bus, BUS_CLOSED);
1502
1503 sd_bus_detach_event(bus);
1504
1505 /* Drop all queued messages so that they drop references to
1506 * the bus object and the bus may be freed */
1507 bus_reset_queues(bus);
1508
1509 bus_close_io_fds(bus);
1510 bus_close_inotify_fd(bus);
1511 }
1512
1513 _public_ sd_bus* sd_bus_flush_close_unref(sd_bus *bus) {
1514 if (!bus)
1515 return NULL;
1516
1517 /* Have to do this before flush() to prevent hang */
1518 bus_kill_exec(bus);
1519
1520 sd_bus_flush(bus);
1521 sd_bus_close(bus);
1522
1523 return sd_bus_unref(bus);
1524 }
1525
1526 void bus_enter_closing(sd_bus *bus) {
1527 assert(bus);
1528
1529 if (!IN_SET(bus->state, BUS_WATCH_BIND, BUS_OPENING, BUS_AUTHENTICATING, BUS_HELLO, BUS_RUNNING))
1530 return;
1531
1532 bus_set_state(bus, BUS_CLOSING);
1533 }
1534
1535 _public_ sd_bus *sd_bus_ref(sd_bus *bus) {
1536 if (!bus)
1537 return NULL;
1538
1539 assert_se(REFCNT_INC(bus->n_ref) >= 2);
1540
1541 return bus;
1542 }
1543
1544 _public_ sd_bus *sd_bus_unref(sd_bus *bus) {
1545 unsigned i;
1546
1547 if (!bus)
1548 return NULL;
1549
1550 i = REFCNT_DEC(bus->n_ref);
1551 if (i > 0)
1552 return NULL;
1553
1554 return bus_free(bus);
1555 }
1556
1557 _public_ int sd_bus_is_open(sd_bus *bus) {
1558 assert_return(bus, -EINVAL);
1559 assert_return(bus = bus_resolve(bus), -ENOPKG);
1560 assert_return(!bus_pid_changed(bus), -ECHILD);
1561
1562 return BUS_IS_OPEN(bus->state);
1563 }
1564
1565 _public_ int sd_bus_is_ready(sd_bus *bus) {
1566 assert_return(bus, -EINVAL);
1567 assert_return(bus = bus_resolve(bus), -ENOPKG);
1568 assert_return(!bus_pid_changed(bus), -ECHILD);
1569
1570 return bus->state == BUS_RUNNING;
1571 }
1572
1573 _public_ int sd_bus_can_send(sd_bus *bus, char type) {
1574 int r;
1575
1576 assert_return(bus, -EINVAL);
1577 assert_return(bus = bus_resolve(bus), -ENOPKG);
1578 assert_return(bus->state != BUS_UNSET, -ENOTCONN);
1579 assert_return(!bus_pid_changed(bus), -ECHILD);
1580
1581 if (bus->is_monitor)
1582 return 0;
1583
1584 if (type == SD_BUS_TYPE_UNIX_FD) {
1585 if (!bus->accept_fd)
1586 return 0;
1587
1588 r = bus_ensure_running(bus);
1589 if (r < 0)
1590 return r;
1591
1592 return bus->can_fds;
1593 }
1594
1595 return bus_type_is_valid(type);
1596 }
1597
1598 _public_ int sd_bus_get_bus_id(sd_bus *bus, sd_id128_t *id) {
1599 int r;
1600
1601 assert_return(bus, -EINVAL);
1602 assert_return(bus = bus_resolve(bus), -ENOPKG);
1603 assert_return(id, -EINVAL);
1604 assert_return(!bus_pid_changed(bus), -ECHILD);
1605
1606 r = bus_ensure_running(bus);
1607 if (r < 0)
1608 return r;
1609
1610 *id = bus->server_id;
1611 return 0;
1612 }
1613
1614 static int bus_seal_message(sd_bus *b, sd_bus_message *m, usec_t timeout) {
1615 int r;
1616
1617 assert(b);
1618 assert(m);
1619
1620 if (m->sealed) {
1621 /* If we copy the same message to multiple
1622 * destinations, avoid using the same cookie
1623 * numbers. */
1624 b->cookie = MAX(b->cookie, BUS_MESSAGE_COOKIE(m));
1625 return 0;
1626 }
1627
1628 if (timeout == 0)
1629 timeout = BUS_DEFAULT_TIMEOUT;
1630
1631 if (!m->sender && b->patch_sender) {
1632 r = sd_bus_message_set_sender(m, b->patch_sender);
1633 if (r < 0)
1634 return r;
1635 }
1636
1637 return sd_bus_message_seal(m, ++b->cookie, timeout);
1638 }
1639
1640 static int bus_remarshal_message(sd_bus *b, sd_bus_message **m) {
1641 bool remarshal = false;
1642
1643 assert(b);
1644
1645 /* wrong packet version */
1646 if (b->message_version != 0 && b->message_version != (*m)->header->version)
1647 remarshal = true;
1648
1649 /* wrong packet endianness */
1650 if (b->message_endian != 0 && b->message_endian != (*m)->header->endian)
1651 remarshal = true;
1652
1653 return remarshal ? bus_message_remarshal(b, m) : 0;
1654 }
1655
1656 int bus_seal_synthetic_message(sd_bus *b, sd_bus_message *m) {
1657 assert(b);
1658 assert(m);
1659
1660 /* Fake some timestamps, if they were requested, and not
1661 * already initialized */
1662 if (b->attach_timestamp) {
1663 if (m->realtime <= 0)
1664 m->realtime = now(CLOCK_REALTIME);
1665
1666 if (m->monotonic <= 0)
1667 m->monotonic = now(CLOCK_MONOTONIC);
1668 }
1669
1670 /* The bus specification says the serial number cannot be 0,
1671 * hence let's fill something in for synthetic messages. Since
1672 * synthetic messages might have a fake sender and we don't
1673 * want to interfere with the real sender's serial numbers we
1674 * pick a fixed, artificial one. We use (uint32_t) -1 rather
1675 * than (uint64_t) -1 since dbus1 only had 32bit identifiers,
1676 * even though kdbus can do 64bit. */
1677 return sd_bus_message_seal(m, 0xFFFFFFFFULL, 0);
1678 }
1679
1680 static int bus_write_message(sd_bus *bus, sd_bus_message *m, size_t *idx) {
1681 int r;
1682
1683 assert(bus);
1684 assert(m);
1685
1686 r = bus_socket_write_message(bus, m, idx);
1687 if (r <= 0)
1688 return r;
1689
1690 if (*idx >= BUS_MESSAGE_SIZE(m))
1691 log_debug("Sent message type=%s sender=%s destination=%s path=%s interface=%s member=%s cookie=%" PRIu64 " reply_cookie=%" PRIu64 " signature=%s error-name=%s error-message=%s",
1692 bus_message_type_to_string(m->header->type),
1693 strna(sd_bus_message_get_sender(m)),
1694 strna(sd_bus_message_get_destination(m)),
1695 strna(sd_bus_message_get_path(m)),
1696 strna(sd_bus_message_get_interface(m)),
1697 strna(sd_bus_message_get_member(m)),
1698 BUS_MESSAGE_COOKIE(m),
1699 m->reply_cookie,
1700 strna(m->root_container.signature),
1701 strna(m->error.name),
1702 strna(m->error.message));
1703
1704 return r;
1705 }
1706
1707 static int dispatch_wqueue(sd_bus *bus) {
1708 int r, ret = 0;
1709
1710 assert(bus);
1711 assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO));
1712
1713 while (bus->wqueue_size > 0) {
1714
1715 r = bus_write_message(bus, bus->wqueue[0], &bus->windex);
1716 if (r < 0)
1717 return r;
1718 else if (r == 0)
1719 /* Didn't do anything this time */
1720 return ret;
1721 else if (bus->windex >= BUS_MESSAGE_SIZE(bus->wqueue[0])) {
1722 /* Fully written. Let's drop the entry from
1723 * the queue.
1724 *
1725 * This isn't particularly optimized, but
1726 * well, this is supposed to be our worst-case
1727 * buffer only, and the socket buffer is
1728 * supposed to be our primary buffer, and if
1729 * it got full, then all bets are off
1730 * anyway. */
1731
1732 bus->wqueue_size--;
1733 sd_bus_message_unref(bus->wqueue[0]);
1734 memmove(bus->wqueue, bus->wqueue + 1, sizeof(sd_bus_message*) * bus->wqueue_size);
1735 bus->windex = 0;
1736
1737 ret = 1;
1738 }
1739 }
1740
1741 return ret;
1742 }
1743
1744 static int bus_read_message(sd_bus *bus, bool hint_priority, int64_t priority) {
1745 assert(bus);
1746
1747 return bus_socket_read_message(bus);
1748 }
1749
1750 int bus_rqueue_make_room(sd_bus *bus) {
1751 assert(bus);
1752
1753 if (bus->rqueue_size >= BUS_RQUEUE_MAX)
1754 return -ENOBUFS;
1755
1756 if (!GREEDY_REALLOC(bus->rqueue, bus->rqueue_allocated, bus->rqueue_size + 1))
1757 return -ENOMEM;
1758
1759 return 0;
1760 }
1761
1762 static int dispatch_rqueue(sd_bus *bus, bool hint_priority, int64_t priority, sd_bus_message **m) {
1763 int r, ret = 0;
1764
1765 assert(bus);
1766 assert(m);
1767 assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO));
1768
1769 /* Note that the priority logic is only available on kdbus,
1770 * where the rqueue is unused. We check the rqueue here
1771 * anyway, because it's simple... */
1772
1773 for (;;) {
1774 if (bus->rqueue_size > 0) {
1775 /* Dispatch a queued message */
1776
1777 *m = bus->rqueue[0];
1778 bus->rqueue_size--;
1779 memmove(bus->rqueue, bus->rqueue + 1, sizeof(sd_bus_message*) * bus->rqueue_size);
1780 return 1;
1781 }
1782
1783 /* Try to read a new message */
1784 r = bus_read_message(bus, hint_priority, priority);
1785 if (r < 0)
1786 return r;
1787 if (r == 0)
1788 return ret;
1789
1790 ret = 1;
1791 }
1792 }
1793
1794 _public_ int sd_bus_send(sd_bus *bus, sd_bus_message *_m, uint64_t *cookie) {
1795 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = sd_bus_message_ref(_m);
1796 int r;
1797
1798 assert_return(m, -EINVAL);
1799
1800 if (!bus)
1801 bus = m->bus;
1802
1803 assert_return(!bus_pid_changed(bus), -ECHILD);
1804
1805 if (!BUS_IS_OPEN(bus->state))
1806 return -ENOTCONN;
1807
1808 if (m->n_fds > 0) {
1809 r = sd_bus_can_send(bus, SD_BUS_TYPE_UNIX_FD);
1810 if (r < 0)
1811 return r;
1812 if (r == 0)
1813 return -EOPNOTSUPP;
1814 }
1815
1816 /* If the cookie number isn't kept, then we know that no reply
1817 * is expected */
1818 if (!cookie && !m->sealed)
1819 m->header->flags |= BUS_MESSAGE_NO_REPLY_EXPECTED;
1820
1821 r = bus_seal_message(bus, m, 0);
1822 if (r < 0)
1823 return r;
1824
1825 /* Remarshall if we have to. This will possibly unref the
1826 * message and place a replacement in m */
1827 r = bus_remarshal_message(bus, &m);
1828 if (r < 0)
1829 return r;
1830
1831 /* If this is a reply and no reply was requested, then let's
1832 * suppress this, if we can */
1833 if (m->dont_send)
1834 goto finish;
1835
1836 if (IN_SET(bus->state, BUS_RUNNING, BUS_HELLO) && bus->wqueue_size <= 0) {
1837 size_t idx = 0;
1838
1839 r = bus_write_message(bus, m, &idx);
1840 if (r < 0) {
1841 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
1842 bus_enter_closing(bus);
1843 return -ECONNRESET;
1844 }
1845
1846 return r;
1847 }
1848
1849 if (idx < BUS_MESSAGE_SIZE(m)) {
1850 /* Wasn't fully written. So let's remember how
1851 * much was written. Note that the first entry
1852 * of the wqueue array is always allocated so
1853 * that we always can remember how much was
1854 * written. */
1855 bus->wqueue[0] = sd_bus_message_ref(m);
1856 bus->wqueue_size = 1;
1857 bus->windex = idx;
1858 }
1859
1860 } else {
1861 /* Just append it to the queue. */
1862
1863 if (bus->wqueue_size >= BUS_WQUEUE_MAX)
1864 return -ENOBUFS;
1865
1866 if (!GREEDY_REALLOC(bus->wqueue, bus->wqueue_allocated, bus->wqueue_size + 1))
1867 return -ENOMEM;
1868
1869 bus->wqueue[bus->wqueue_size++] = sd_bus_message_ref(m);
1870 }
1871
1872 finish:
1873 if (cookie)
1874 *cookie = BUS_MESSAGE_COOKIE(m);
1875
1876 return 1;
1877 }
1878
1879 _public_ int sd_bus_send_to(sd_bus *bus, sd_bus_message *m, const char *destination, uint64_t *cookie) {
1880 int r;
1881
1882 assert_return(m, -EINVAL);
1883
1884 if (!bus)
1885 bus = m->bus;
1886
1887 assert_return(!bus_pid_changed(bus), -ECHILD);
1888
1889 if (!BUS_IS_OPEN(bus->state))
1890 return -ENOTCONN;
1891
1892 if (!streq_ptr(m->destination, destination)) {
1893
1894 if (!destination)
1895 return -EEXIST;
1896
1897 r = sd_bus_message_set_destination(m, destination);
1898 if (r < 0)
1899 return r;
1900 }
1901
1902 return sd_bus_send(bus, m, cookie);
1903 }
1904
1905 static usec_t calc_elapse(sd_bus *bus, uint64_t usec) {
1906 assert(bus);
1907
1908 if (usec == (uint64_t) -1)
1909 return 0;
1910
1911 /* We start all timeouts the instant we enter BUS_HELLO/BUS_RUNNING state, so that the don't run in parallel
1912 * with any connection setup states. Hence, if a method callback is started earlier than that we just store the
1913 * relative timestamp, and afterwards the absolute one. */
1914
1915 if (IN_SET(bus->state, BUS_WATCH_BIND, BUS_OPENING, BUS_AUTHENTICATING))
1916 return usec;
1917 else
1918 return now(CLOCK_MONOTONIC) + usec;
1919 }
1920
1921 static int timeout_compare(const void *a, const void *b) {
1922 const struct reply_callback *x = a, *y = b;
1923
1924 if (x->timeout_usec != 0 && y->timeout_usec == 0)
1925 return -1;
1926
1927 if (x->timeout_usec == 0 && y->timeout_usec != 0)
1928 return 1;
1929
1930 if (x->timeout_usec < y->timeout_usec)
1931 return -1;
1932
1933 if (x->timeout_usec > y->timeout_usec)
1934 return 1;
1935
1936 return 0;
1937 }
1938
1939 _public_ int sd_bus_call_async(
1940 sd_bus *bus,
1941 sd_bus_slot **slot,
1942 sd_bus_message *_m,
1943 sd_bus_message_handler_t callback,
1944 void *userdata,
1945 uint64_t usec) {
1946
1947 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = sd_bus_message_ref(_m);
1948 _cleanup_(sd_bus_slot_unrefp) sd_bus_slot *s = NULL;
1949 int r;
1950
1951 assert_return(m, -EINVAL);
1952 assert_return(m->header->type == SD_BUS_MESSAGE_METHOD_CALL, -EINVAL);
1953 assert_return(!m->sealed || (!!callback == !(m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED)), -EINVAL);
1954
1955 if (!bus)
1956 bus = m->bus;
1957
1958 assert_return(!bus_pid_changed(bus), -ECHILD);
1959
1960 if (!BUS_IS_OPEN(bus->state))
1961 return -ENOTCONN;
1962
1963 /* If no callback is specified and there's no interest in a slot, then there's no reason to ask for a reply */
1964 if (!callback && !slot && !m->sealed)
1965 m->header->flags |= BUS_MESSAGE_NO_REPLY_EXPECTED;
1966
1967 r = ordered_hashmap_ensure_allocated(&bus->reply_callbacks, &uint64_hash_ops);
1968 if (r < 0)
1969 return r;
1970
1971 r = prioq_ensure_allocated(&bus->reply_callbacks_prioq, timeout_compare);
1972 if (r < 0)
1973 return r;
1974
1975 r = bus_seal_message(bus, m, usec);
1976 if (r < 0)
1977 return r;
1978
1979 r = bus_remarshal_message(bus, &m);
1980 if (r < 0)
1981 return r;
1982
1983 if (slot || callback) {
1984 s = bus_slot_allocate(bus, !slot, BUS_REPLY_CALLBACK, sizeof(struct reply_callback), userdata);
1985 if (!s)
1986 return -ENOMEM;
1987
1988 s->reply_callback.callback = callback;
1989
1990 s->reply_callback.cookie = BUS_MESSAGE_COOKIE(m);
1991 r = ordered_hashmap_put(bus->reply_callbacks, &s->reply_callback.cookie, &s->reply_callback);
1992 if (r < 0) {
1993 s->reply_callback.cookie = 0;
1994 return r;
1995 }
1996
1997 s->reply_callback.timeout_usec = calc_elapse(bus, m->timeout);
1998 if (s->reply_callback.timeout_usec != 0) {
1999 r = prioq_put(bus->reply_callbacks_prioq, &s->reply_callback, &s->reply_callback.prioq_idx);
2000 if (r < 0) {
2001 s->reply_callback.timeout_usec = 0;
2002 return r;
2003 }
2004 }
2005 }
2006
2007 r = sd_bus_send(bus, m, s ? &s->reply_callback.cookie : NULL);
2008 if (r < 0)
2009 return r;
2010
2011 if (slot)
2012 *slot = s;
2013 s = NULL;
2014
2015 return r;
2016 }
2017
2018 int bus_ensure_running(sd_bus *bus) {
2019 int r;
2020
2021 assert(bus);
2022
2023 if (IN_SET(bus->state, BUS_UNSET, BUS_CLOSED, BUS_CLOSING))
2024 return -ENOTCONN;
2025 if (bus->state == BUS_RUNNING)
2026 return 1;
2027
2028 for (;;) {
2029 r = sd_bus_process(bus, NULL);
2030 if (r < 0)
2031 return r;
2032 if (bus->state == BUS_RUNNING)
2033 return 1;
2034 if (r > 0)
2035 continue;
2036
2037 r = sd_bus_wait(bus, (uint64_t) -1);
2038 if (r < 0)
2039 return r;
2040 }
2041 }
2042
2043 _public_ int sd_bus_call(
2044 sd_bus *bus,
2045 sd_bus_message *_m,
2046 uint64_t usec,
2047 sd_bus_error *error,
2048 sd_bus_message **reply) {
2049
2050 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = sd_bus_message_ref(_m);
2051 usec_t timeout;
2052 uint64_t cookie;
2053 unsigned i;
2054 int r;
2055
2056 bus_assert_return(m, -EINVAL, error);
2057 bus_assert_return(m->header->type == SD_BUS_MESSAGE_METHOD_CALL, -EINVAL, error);
2058 bus_assert_return(!(m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED), -EINVAL, error);
2059 bus_assert_return(!bus_error_is_dirty(error), -EINVAL, error);
2060
2061 if (!bus)
2062 bus = m->bus;
2063
2064 bus_assert_return(!bus_pid_changed(bus), -ECHILD, error);
2065
2066 if (!BUS_IS_OPEN(bus->state)) {
2067 r = -ENOTCONN;
2068 goto fail;
2069 }
2070
2071 r = bus_ensure_running(bus);
2072 if (r < 0)
2073 goto fail;
2074
2075 i = bus->rqueue_size;
2076
2077 r = bus_seal_message(bus, m, usec);
2078 if (r < 0)
2079 goto fail;
2080
2081 r = bus_remarshal_message(bus, &m);
2082 if (r < 0)
2083 goto fail;
2084
2085 r = sd_bus_send(bus, m, &cookie);
2086 if (r < 0)
2087 goto fail;
2088
2089 timeout = calc_elapse(bus, m->timeout);
2090
2091 for (;;) {
2092 usec_t left;
2093
2094 while (i < bus->rqueue_size) {
2095 sd_bus_message *incoming = NULL;
2096
2097 incoming = bus->rqueue[i];
2098
2099 if (incoming->reply_cookie == cookie) {
2100 /* Found a match! */
2101
2102 memmove(bus->rqueue + i, bus->rqueue + i + 1, sizeof(sd_bus_message*) * (bus->rqueue_size - i - 1));
2103 bus->rqueue_size--;
2104 log_debug_bus_message(incoming);
2105
2106 if (incoming->header->type == SD_BUS_MESSAGE_METHOD_RETURN) {
2107
2108 if (incoming->n_fds <= 0 || bus->accept_fd) {
2109 if (reply)
2110 *reply = incoming;
2111 else
2112 sd_bus_message_unref(incoming);
2113
2114 return 1;
2115 }
2116
2117 r = sd_bus_error_setf(error, SD_BUS_ERROR_INCONSISTENT_MESSAGE, "Reply message contained file descriptors which I couldn't accept. Sorry.");
2118 sd_bus_message_unref(incoming);
2119 return r;
2120
2121 } else if (incoming->header->type == SD_BUS_MESSAGE_METHOD_ERROR) {
2122 r = sd_bus_error_copy(error, &incoming->error);
2123 sd_bus_message_unref(incoming);
2124 return r;
2125 } else {
2126 r = -EIO;
2127 goto fail;
2128 }
2129
2130 } else if (BUS_MESSAGE_COOKIE(incoming) == cookie &&
2131 bus->unique_name &&
2132 incoming->sender &&
2133 streq(bus->unique_name, incoming->sender)) {
2134
2135 memmove(bus->rqueue + i, bus->rqueue + i + 1, sizeof(sd_bus_message*) * (bus->rqueue_size - i - 1));
2136 bus->rqueue_size--;
2137
2138 /* Our own message? Somebody is trying
2139 * to send its own client a message,
2140 * let's not dead-lock, let's fail
2141 * immediately. */
2142
2143 sd_bus_message_unref(incoming);
2144 r = -ELOOP;
2145 goto fail;
2146 }
2147
2148 /* Try to read more, right-away */
2149 i++;
2150 }
2151
2152 r = bus_read_message(bus, false, 0);
2153 if (r < 0) {
2154 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
2155 bus_enter_closing(bus);
2156 r = -ECONNRESET;
2157 }
2158
2159 goto fail;
2160 }
2161 if (r > 0)
2162 continue;
2163
2164 if (timeout > 0) {
2165 usec_t n;
2166
2167 n = now(CLOCK_MONOTONIC);
2168 if (n >= timeout) {
2169 r = -ETIMEDOUT;
2170 goto fail;
2171 }
2172
2173 left = timeout - n;
2174 } else
2175 left = (uint64_t) -1;
2176
2177 r = bus_poll(bus, true, left);
2178 if (r < 0)
2179 goto fail;
2180 if (r == 0) {
2181 r = -ETIMEDOUT;
2182 goto fail;
2183 }
2184
2185 r = dispatch_wqueue(bus);
2186 if (r < 0) {
2187 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
2188 bus_enter_closing(bus);
2189 r = -ECONNRESET;
2190 }
2191
2192 goto fail;
2193 }
2194 }
2195
2196 fail:
2197 return sd_bus_error_set_errno(error, r);
2198 }
2199
2200 _public_ int sd_bus_get_fd(sd_bus *bus) {
2201
2202 assert_return(bus, -EINVAL);
2203 assert_return(bus = bus_resolve(bus), -ENOPKG);
2204 assert_return(bus->input_fd == bus->output_fd, -EPERM);
2205 assert_return(!bus_pid_changed(bus), -ECHILD);
2206
2207 if (bus->state == BUS_CLOSED)
2208 return -ENOTCONN;
2209
2210 if (bus->inotify_fd >= 0)
2211 return bus->inotify_fd;
2212
2213 if (bus->input_fd >= 0)
2214 return bus->input_fd;
2215
2216 return -ENOTCONN;
2217 }
2218
2219 _public_ int sd_bus_get_events(sd_bus *bus) {
2220 int flags = 0;
2221
2222 assert_return(bus, -EINVAL);
2223 assert_return(bus = bus_resolve(bus), -ENOPKG);
2224 assert_return(!bus_pid_changed(bus), -ECHILD);
2225
2226 switch (bus->state) {
2227
2228 case BUS_UNSET:
2229 case BUS_CLOSED:
2230 return -ENOTCONN;
2231
2232 case BUS_WATCH_BIND:
2233 flags |= POLLIN;
2234 break;
2235
2236 case BUS_OPENING:
2237 flags |= POLLOUT;
2238 break;
2239
2240 case BUS_AUTHENTICATING:
2241 if (bus_socket_auth_needs_write(bus))
2242 flags |= POLLOUT;
2243
2244 flags |= POLLIN;
2245 break;
2246
2247 case BUS_RUNNING:
2248 case BUS_HELLO:
2249 if (bus->rqueue_size <= 0)
2250 flags |= POLLIN;
2251 if (bus->wqueue_size > 0)
2252 flags |= POLLOUT;
2253 break;
2254
2255 case BUS_CLOSING:
2256 break;
2257
2258 default:
2259 assert_not_reached("Unknown state");
2260 }
2261
2262 return flags;
2263 }
2264
2265 _public_ int sd_bus_get_timeout(sd_bus *bus, uint64_t *timeout_usec) {
2266 struct reply_callback *c;
2267
2268 assert_return(bus, -EINVAL);
2269 assert_return(bus = bus_resolve(bus), -ENOPKG);
2270 assert_return(timeout_usec, -EINVAL);
2271 assert_return(!bus_pid_changed(bus), -ECHILD);
2272
2273 if (!BUS_IS_OPEN(bus->state) && bus->state != BUS_CLOSING)
2274 return -ENOTCONN;
2275
2276 if (bus->track_queue) {
2277 *timeout_usec = 0;
2278 return 1;
2279 }
2280
2281 switch (bus->state) {
2282
2283 case BUS_AUTHENTICATING:
2284 *timeout_usec = bus->auth_timeout;
2285 return 1;
2286
2287 case BUS_RUNNING:
2288 case BUS_HELLO:
2289 if (bus->rqueue_size > 0) {
2290 *timeout_usec = 0;
2291 return 1;
2292 }
2293
2294 c = prioq_peek(bus->reply_callbacks_prioq);
2295 if (!c) {
2296 *timeout_usec = (uint64_t) -1;
2297 return 0;
2298 }
2299
2300 if (c->timeout_usec == 0) {
2301 *timeout_usec = (uint64_t) -1;
2302 return 0;
2303 }
2304
2305 *timeout_usec = c->timeout_usec;
2306 return 1;
2307
2308 case BUS_CLOSING:
2309 *timeout_usec = 0;
2310 return 1;
2311
2312 case BUS_WATCH_BIND:
2313 case BUS_OPENING:
2314 *timeout_usec = (uint64_t) -1;
2315 return 0;
2316
2317 default:
2318 assert_not_reached("Unknown or unexpected stat");
2319 }
2320 }
2321
2322 static int process_timeout(sd_bus *bus) {
2323 _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
2324 _cleanup_(sd_bus_message_unrefp) sd_bus_message* m = NULL;
2325 struct reply_callback *c;
2326 sd_bus_slot *slot;
2327 bool is_hello;
2328 usec_t n;
2329 int r;
2330
2331 assert(bus);
2332 assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO));
2333
2334 c = prioq_peek(bus->reply_callbacks_prioq);
2335 if (!c)
2336 return 0;
2337
2338 n = now(CLOCK_MONOTONIC);
2339 if (c->timeout_usec > n)
2340 return 0;
2341
2342 r = bus_message_new_synthetic_error(
2343 bus,
2344 c->cookie,
2345 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Method call timed out"),
2346 &m);
2347 if (r < 0)
2348 return r;
2349
2350 r = bus_seal_synthetic_message(bus, m);
2351 if (r < 0)
2352 return r;
2353
2354 assert_se(prioq_pop(bus->reply_callbacks_prioq) == c);
2355 c->timeout_usec = 0;
2356
2357 ordered_hashmap_remove(bus->reply_callbacks, &c->cookie);
2358 c->cookie = 0;
2359
2360 slot = container_of(c, sd_bus_slot, reply_callback);
2361
2362 bus->iteration_counter++;
2363
2364 is_hello = bus->state == BUS_HELLO && c->callback == hello_callback;
2365
2366 bus->current_message = m;
2367 bus->current_slot = sd_bus_slot_ref(slot);
2368 bus->current_handler = c->callback;
2369 bus->current_userdata = slot->userdata;
2370 r = c->callback(m, slot->userdata, &error_buffer);
2371 bus->current_userdata = NULL;
2372 bus->current_handler = NULL;
2373 bus->current_slot = NULL;
2374 bus->current_message = NULL;
2375
2376 if (slot->floating) {
2377 bus_slot_disconnect(slot);
2378 sd_bus_slot_unref(slot);
2379 }
2380
2381 sd_bus_slot_unref(slot);
2382
2383 /* When this is the hello message and it timed out, then make sure to propagate the error up, don't just log
2384 * and ignore the callback handler's return value. */
2385 if (is_hello)
2386 return r;
2387
2388 return bus_maybe_reply_error(m, r, &error_buffer);
2389 }
2390
2391 static int process_hello(sd_bus *bus, sd_bus_message *m) {
2392 assert(bus);
2393 assert(m);
2394
2395 if (bus->state != BUS_HELLO)
2396 return 0;
2397
2398 /* Let's make sure the first message on the bus is the HELLO
2399 * reply. But note that we don't actually parse the message
2400 * here (we leave that to the usual handling), we just verify
2401 * we don't let any earlier msg through. */
2402
2403 if (!IN_SET(m->header->type, SD_BUS_MESSAGE_METHOD_RETURN, SD_BUS_MESSAGE_METHOD_ERROR))
2404 return -EIO;
2405
2406 if (m->reply_cookie != 1)
2407 return -EIO;
2408
2409 return 0;
2410 }
2411
2412 static int process_reply(sd_bus *bus, sd_bus_message *m) {
2413 _cleanup_(sd_bus_message_unrefp) sd_bus_message *synthetic_reply = NULL;
2414 _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
2415 struct reply_callback *c;
2416 sd_bus_slot *slot;
2417 bool is_hello;
2418 int r;
2419
2420 assert(bus);
2421 assert(m);
2422
2423 if (!IN_SET(m->header->type, SD_BUS_MESSAGE_METHOD_RETURN, SD_BUS_MESSAGE_METHOD_ERROR))
2424 return 0;
2425
2426 if (m->destination && bus->unique_name && !streq_ptr(m->destination, bus->unique_name))
2427 return 0;
2428
2429 c = ordered_hashmap_remove(bus->reply_callbacks, &m->reply_cookie);
2430 if (!c)
2431 return 0;
2432
2433 c->cookie = 0;
2434
2435 slot = container_of(c, sd_bus_slot, reply_callback);
2436
2437 if (m->n_fds > 0 && !bus->accept_fd) {
2438
2439 /* If the reply contained a file descriptor which we
2440 * didn't want we pass an error instead. */
2441
2442 r = bus_message_new_synthetic_error(
2443 bus,
2444 m->reply_cookie,
2445 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INCONSISTENT_MESSAGE, "Reply message contained file descriptor"),
2446 &synthetic_reply);
2447 if (r < 0)
2448 return r;
2449
2450 /* Copy over original timestamp */
2451 synthetic_reply->realtime = m->realtime;
2452 synthetic_reply->monotonic = m->monotonic;
2453 synthetic_reply->seqnum = m->seqnum;
2454
2455 r = bus_seal_synthetic_message(bus, synthetic_reply);
2456 if (r < 0)
2457 return r;
2458
2459 m = synthetic_reply;
2460 } else {
2461 r = sd_bus_message_rewind(m, true);
2462 if (r < 0)
2463 return r;
2464 }
2465
2466 if (c->timeout_usec != 0) {
2467 prioq_remove(bus->reply_callbacks_prioq, c, &c->prioq_idx);
2468 c->timeout_usec = 0;
2469 }
2470
2471 is_hello = bus->state == BUS_HELLO && c->callback == hello_callback;
2472
2473 bus->current_slot = sd_bus_slot_ref(slot);
2474 bus->current_handler = c->callback;
2475 bus->current_userdata = slot->userdata;
2476 r = c->callback(m, slot->userdata, &error_buffer);
2477 bus->current_userdata = NULL;
2478 bus->current_handler = NULL;
2479 bus->current_slot = NULL;
2480
2481 if (slot->floating) {
2482 bus_slot_disconnect(slot);
2483 sd_bus_slot_unref(slot);
2484 }
2485
2486 sd_bus_slot_unref(slot);
2487
2488 /* When this is the hello message and it failed, then make sure to propagate the error up, don't just log and
2489 * ignore the callback handler's return value. */
2490 if (is_hello)
2491 return r;
2492
2493 return bus_maybe_reply_error(m, r, &error_buffer);
2494 }
2495
2496 static int process_filter(sd_bus *bus, sd_bus_message *m) {
2497 _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
2498 struct filter_callback *l;
2499 int r;
2500
2501 assert(bus);
2502 assert(m);
2503
2504 do {
2505 bus->filter_callbacks_modified = false;
2506
2507 LIST_FOREACH(callbacks, l, bus->filter_callbacks) {
2508 sd_bus_slot *slot;
2509
2510 if (bus->filter_callbacks_modified)
2511 break;
2512
2513 /* Don't run this more than once per iteration */
2514 if (l->last_iteration == bus->iteration_counter)
2515 continue;
2516
2517 l->last_iteration = bus->iteration_counter;
2518
2519 r = sd_bus_message_rewind(m, true);
2520 if (r < 0)
2521 return r;
2522
2523 slot = container_of(l, sd_bus_slot, filter_callback);
2524
2525 bus->current_slot = sd_bus_slot_ref(slot);
2526 bus->current_handler = l->callback;
2527 bus->current_userdata = slot->userdata;
2528 r = l->callback(m, slot->userdata, &error_buffer);
2529 bus->current_userdata = NULL;
2530 bus->current_handler = NULL;
2531 bus->current_slot = sd_bus_slot_unref(slot);
2532
2533 r = bus_maybe_reply_error(m, r, &error_buffer);
2534 if (r != 0)
2535 return r;
2536
2537 }
2538
2539 } while (bus->filter_callbacks_modified);
2540
2541 return 0;
2542 }
2543
2544 static int process_match(sd_bus *bus, sd_bus_message *m) {
2545 int r;
2546
2547 assert(bus);
2548 assert(m);
2549
2550 do {
2551 bus->match_callbacks_modified = false;
2552
2553 r = bus_match_run(bus, &bus->match_callbacks, m);
2554 if (r != 0)
2555 return r;
2556
2557 } while (bus->match_callbacks_modified);
2558
2559 return 0;
2560 }
2561
2562 static int process_builtin(sd_bus *bus, sd_bus_message *m) {
2563 _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
2564 int r;
2565
2566 assert(bus);
2567 assert(m);
2568
2569 if (bus->is_monitor)
2570 return 0;
2571
2572 if (bus->manual_peer_interface)
2573 return 0;
2574
2575 if (m->header->type != SD_BUS_MESSAGE_METHOD_CALL)
2576 return 0;
2577
2578 if (!streq_ptr(m->interface, "org.freedesktop.DBus.Peer"))
2579 return 0;
2580
2581 if (m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED)
2582 return 1;
2583
2584 if (streq_ptr(m->member, "Ping"))
2585 r = sd_bus_message_new_method_return(m, &reply);
2586 else if (streq_ptr(m->member, "GetMachineId")) {
2587 sd_id128_t id;
2588 char sid[33];
2589
2590 r = sd_id128_get_machine(&id);
2591 if (r < 0)
2592 return r;
2593
2594 r = sd_bus_message_new_method_return(m, &reply);
2595 if (r < 0)
2596 return r;
2597
2598 r = sd_bus_message_append(reply, "s", sd_id128_to_string(id, sid));
2599 } else {
2600 r = sd_bus_message_new_method_errorf(
2601 m, &reply,
2602 SD_BUS_ERROR_UNKNOWN_METHOD,
2603 "Unknown method '%s' on interface '%s'.", m->member, m->interface);
2604 }
2605
2606 if (r < 0)
2607 return r;
2608
2609 r = sd_bus_send(bus, reply, NULL);
2610 if (r < 0)
2611 return r;
2612
2613 return 1;
2614 }
2615
2616 static int process_fd_check(sd_bus *bus, sd_bus_message *m) {
2617 assert(bus);
2618 assert(m);
2619
2620 /* If we got a message with a file descriptor which we didn't
2621 * want to accept, then let's drop it. How can this even
2622 * happen? For example, when the kernel queues a message into
2623 * an activatable names's queue which allows fds, and then is
2624 * delivered to us later even though we ourselves did not
2625 * negotiate it. */
2626
2627 if (bus->is_monitor)
2628 return 0;
2629
2630 if (m->n_fds <= 0)
2631 return 0;
2632
2633 if (bus->accept_fd)
2634 return 0;
2635
2636 if (m->header->type != SD_BUS_MESSAGE_METHOD_CALL)
2637 return 1; /* just eat it up */
2638
2639 return sd_bus_reply_method_errorf(m, SD_BUS_ERROR_INCONSISTENT_MESSAGE, "Message contains file descriptors, which I cannot accept. Sorry.");
2640 }
2641
2642 static int process_message(sd_bus *bus, sd_bus_message *m) {
2643 int r;
2644
2645 assert(bus);
2646 assert(m);
2647
2648 bus->current_message = m;
2649 bus->iteration_counter++;
2650
2651 log_debug_bus_message(m);
2652
2653 r = process_hello(bus, m);
2654 if (r != 0)
2655 goto finish;
2656
2657 r = process_reply(bus, m);
2658 if (r != 0)
2659 goto finish;
2660
2661 r = process_fd_check(bus, m);
2662 if (r != 0)
2663 goto finish;
2664
2665 r = process_filter(bus, m);
2666 if (r != 0)
2667 goto finish;
2668
2669 r = process_match(bus, m);
2670 if (r != 0)
2671 goto finish;
2672
2673 r = process_builtin(bus, m);
2674 if (r != 0)
2675 goto finish;
2676
2677 r = bus_process_object(bus, m);
2678
2679 finish:
2680 bus->current_message = NULL;
2681 return r;
2682 }
2683
2684 static int dispatch_track(sd_bus *bus) {
2685 assert(bus);
2686
2687 if (!bus->track_queue)
2688 return 0;
2689
2690 bus_track_dispatch(bus->track_queue);
2691 return 1;
2692 }
2693
2694 static int process_running(sd_bus *bus, bool hint_priority, int64_t priority, sd_bus_message **ret) {
2695 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
2696 int r;
2697
2698 assert(bus);
2699 assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO));
2700
2701 r = process_timeout(bus);
2702 if (r != 0)
2703 goto null_message;
2704
2705 r = dispatch_wqueue(bus);
2706 if (r != 0)
2707 goto null_message;
2708
2709 r = dispatch_track(bus);
2710 if (r != 0)
2711 goto null_message;
2712
2713 r = dispatch_rqueue(bus, hint_priority, priority, &m);
2714 if (r < 0)
2715 return r;
2716 if (!m)
2717 goto null_message;
2718
2719 r = process_message(bus, m);
2720 if (r != 0)
2721 goto null_message;
2722
2723 if (ret) {
2724 r = sd_bus_message_rewind(m, true);
2725 if (r < 0)
2726 return r;
2727
2728 *ret = TAKE_PTR(m);
2729
2730 return 1;
2731 }
2732
2733 if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL) {
2734
2735 log_debug("Unprocessed message call sender=%s object=%s interface=%s member=%s",
2736 strna(sd_bus_message_get_sender(m)),
2737 strna(sd_bus_message_get_path(m)),
2738 strna(sd_bus_message_get_interface(m)),
2739 strna(sd_bus_message_get_member(m)));
2740
2741 r = sd_bus_reply_method_errorf(
2742 m,
2743 SD_BUS_ERROR_UNKNOWN_OBJECT,
2744 "Unknown object '%s'.", m->path);
2745 if (r < 0)
2746 return r;
2747 }
2748
2749 return 1;
2750
2751 null_message:
2752 if (r >= 0 && ret)
2753 *ret = NULL;
2754
2755 return r;
2756 }
2757
2758 static int bus_exit_now(sd_bus *bus) {
2759 assert(bus);
2760
2761 /* Exit due to close, if this is requested. If this is bus object is attached to an event source, invokes
2762 * sd_event_exit(), otherwise invokes libc exit(). */
2763
2764 if (bus->exited) /* did we already exit? */
2765 return 0;
2766 if (!bus->exit_triggered) /* was the exit condition triggered? */
2767 return 0;
2768 if (!bus->exit_on_disconnect) /* Shall we actually exit on disconnection? */
2769 return 0;
2770
2771 bus->exited = true; /* never exit more than once */
2772
2773 log_debug("Bus connection disconnected, exiting.");
2774
2775 if (bus->event)
2776 return sd_event_exit(bus->event, EXIT_FAILURE);
2777 else
2778 exit(EXIT_FAILURE);
2779
2780 assert_not_reached("exit() didn't exit?");
2781 }
2782
2783 static int process_closing_reply_callback(sd_bus *bus, struct reply_callback *c) {
2784 _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
2785 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
2786 sd_bus_slot *slot;
2787 int r;
2788
2789 assert(bus);
2790 assert(c);
2791
2792 r = bus_message_new_synthetic_error(
2793 bus,
2794 c->cookie,
2795 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Connection terminated"),
2796 &m);
2797 if (r < 0)
2798 return r;
2799
2800 r = bus_seal_synthetic_message(bus, m);
2801 if (r < 0)
2802 return r;
2803
2804 if (c->timeout_usec != 0) {
2805 prioq_remove(bus->reply_callbacks_prioq, c, &c->prioq_idx);
2806 c->timeout_usec = 0;
2807 }
2808
2809 ordered_hashmap_remove(bus->reply_callbacks, &c->cookie);
2810 c->cookie = 0;
2811
2812 slot = container_of(c, sd_bus_slot, reply_callback);
2813
2814 bus->iteration_counter++;
2815
2816 bus->current_message = m;
2817 bus->current_slot = sd_bus_slot_ref(slot);
2818 bus->current_handler = c->callback;
2819 bus->current_userdata = slot->userdata;
2820 r = c->callback(m, slot->userdata, &error_buffer);
2821 bus->current_userdata = NULL;
2822 bus->current_handler = NULL;
2823 bus->current_slot = NULL;
2824 bus->current_message = NULL;
2825
2826 if (slot->floating) {
2827 bus_slot_disconnect(slot);
2828 sd_bus_slot_unref(slot);
2829 }
2830
2831 sd_bus_slot_unref(slot);
2832
2833 return bus_maybe_reply_error(m, r, &error_buffer);
2834 }
2835
2836 static int process_closing(sd_bus *bus, sd_bus_message **ret) {
2837 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
2838 struct reply_callback *c;
2839 int r;
2840
2841 assert(bus);
2842 assert(bus->state == BUS_CLOSING);
2843
2844 /* First, fail all outstanding method calls */
2845 c = ordered_hashmap_first(bus->reply_callbacks);
2846 if (c)
2847 return process_closing_reply_callback(bus, c);
2848
2849 /* Then, fake-drop all remaining bus tracking references */
2850 if (bus->tracks) {
2851 bus_track_close(bus->tracks);
2852 return 1;
2853 }
2854
2855 /* Then, synthesize a Disconnected message */
2856 r = sd_bus_message_new_signal(
2857 bus,
2858 &m,
2859 "/org/freedesktop/DBus/Local",
2860 "org.freedesktop.DBus.Local",
2861 "Disconnected");
2862 if (r < 0)
2863 return r;
2864
2865 bus_message_set_sender_local(bus, m);
2866
2867 r = bus_seal_synthetic_message(bus, m);
2868 if (r < 0)
2869 return r;
2870
2871 sd_bus_close(bus);
2872
2873 bus->current_message = m;
2874 bus->iteration_counter++;
2875
2876 r = process_filter(bus, m);
2877 if (r != 0)
2878 goto finish;
2879
2880 r = process_match(bus, m);
2881 if (r != 0)
2882 goto finish;
2883
2884 /* Nothing else to do, exit now, if the condition holds */
2885 bus->exit_triggered = true;
2886 (void) bus_exit_now(bus);
2887
2888 if (ret)
2889 *ret = TAKE_PTR(m);
2890
2891 r = 1;
2892
2893 finish:
2894 bus->current_message = NULL;
2895
2896 return r;
2897 }
2898
2899 static int bus_process_internal(sd_bus *bus, bool hint_priority, int64_t priority, sd_bus_message **ret) {
2900 BUS_DONT_DESTROY(bus);
2901 int r;
2902
2903 /* Returns 0 when we didn't do anything. This should cause the
2904 * caller to invoke sd_bus_wait() before returning the next
2905 * time. Returns > 0 when we did something, which possibly
2906 * means *ret is filled in with an unprocessed message. */
2907
2908 assert_return(bus, -EINVAL);
2909 assert_return(bus = bus_resolve(bus), -ENOPKG);
2910 assert_return(!bus_pid_changed(bus), -ECHILD);
2911
2912 /* We don't allow recursively invoking sd_bus_process(). */
2913 assert_return(!bus->current_message, -EBUSY);
2914 assert(!bus->current_slot);
2915
2916 switch (bus->state) {
2917
2918 case BUS_UNSET:
2919 return -ENOTCONN;
2920
2921 case BUS_CLOSED:
2922 return -ECONNRESET;
2923
2924 case BUS_WATCH_BIND:
2925 r = bus_socket_process_watch_bind(bus);
2926 break;
2927
2928 case BUS_OPENING:
2929 r = bus_socket_process_opening(bus);
2930 break;
2931
2932 case BUS_AUTHENTICATING:
2933 r = bus_socket_process_authenticating(bus);
2934 break;
2935
2936 case BUS_RUNNING:
2937 case BUS_HELLO:
2938 r = process_running(bus, hint_priority, priority, ret);
2939 if (r >= 0)
2940 return r;
2941
2942 /* This branch initializes *ret, hence we don't use the generic error checking below */
2943 break;
2944
2945 case BUS_CLOSING:
2946 return process_closing(bus, ret);
2947
2948 default:
2949 assert_not_reached("Unknown state");
2950 }
2951
2952 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
2953 bus_enter_closing(bus);
2954 r = 1;
2955 } else if (r < 0)
2956 return r;
2957
2958 if (ret)
2959 *ret = NULL;
2960
2961 return r;
2962 }
2963
2964 _public_ int sd_bus_process(sd_bus *bus, sd_bus_message **ret) {
2965 return bus_process_internal(bus, false, 0, ret);
2966 }
2967
2968 _public_ int sd_bus_process_priority(sd_bus *bus, int64_t priority, sd_bus_message **ret) {
2969 return bus_process_internal(bus, true, priority, ret);
2970 }
2971
2972 static int bus_poll(sd_bus *bus, bool need_more, uint64_t timeout_usec) {
2973 struct pollfd p[2] = {};
2974 int r, n;
2975 struct timespec ts;
2976 usec_t m = USEC_INFINITY;
2977
2978 assert(bus);
2979
2980 if (bus->state == BUS_CLOSING)
2981 return 1;
2982
2983 if (!BUS_IS_OPEN(bus->state))
2984 return -ENOTCONN;
2985
2986 if (bus->state == BUS_WATCH_BIND) {
2987 assert(bus->inotify_fd >= 0);
2988
2989 p[0].events = POLLIN;
2990 p[0].fd = bus->inotify_fd;
2991 n = 1;
2992 } else {
2993 int e;
2994
2995 e = sd_bus_get_events(bus);
2996 if (e < 0)
2997 return e;
2998
2999 if (need_more)
3000 /* The caller really needs some more data, he doesn't
3001 * care about what's already read, or any timeouts
3002 * except its own. */
3003 e |= POLLIN;
3004 else {
3005 usec_t until;
3006 /* The caller wants to process if there's something to
3007 * process, but doesn't care otherwise */
3008
3009 r = sd_bus_get_timeout(bus, &until);
3010 if (r < 0)
3011 return r;
3012 if (r > 0)
3013 m = usec_sub_unsigned(until, now(CLOCK_MONOTONIC));
3014 }
3015
3016 p[0].fd = bus->input_fd;
3017 if (bus->output_fd == bus->input_fd) {
3018 p[0].events = e;
3019 n = 1;
3020 } else {
3021 p[0].events = e & POLLIN;
3022 p[1].fd = bus->output_fd;
3023 p[1].events = e & POLLOUT;
3024 n = 2;
3025 }
3026 }
3027
3028 if (timeout_usec != (uint64_t) -1 && (m == USEC_INFINITY || timeout_usec < m))
3029 m = timeout_usec;
3030
3031 r = ppoll(p, n, m == USEC_INFINITY ? NULL : timespec_store(&ts, m), NULL);
3032 if (r < 0)
3033 return -errno;
3034
3035 return r > 0 ? 1 : 0;
3036 }
3037
3038 _public_ int sd_bus_wait(sd_bus *bus, uint64_t timeout_usec) {
3039
3040 assert_return(bus, -EINVAL);
3041 assert_return(bus = bus_resolve(bus), -ENOPKG);
3042 assert_return(!bus_pid_changed(bus), -ECHILD);
3043
3044 if (bus->state == BUS_CLOSING)
3045 return 0;
3046
3047 if (!BUS_IS_OPEN(bus->state))
3048 return -ENOTCONN;
3049
3050 if (bus->rqueue_size > 0)
3051 return 0;
3052
3053 return bus_poll(bus, false, timeout_usec);
3054 }
3055
3056 _public_ int sd_bus_flush(sd_bus *bus) {
3057 int r;
3058
3059 assert_return(bus, -EINVAL);
3060 assert_return(bus = bus_resolve(bus), -ENOPKG);
3061 assert_return(!bus_pid_changed(bus), -ECHILD);
3062
3063 if (bus->state == BUS_CLOSING)
3064 return 0;
3065
3066 if (!BUS_IS_OPEN(bus->state))
3067 return -ENOTCONN;
3068
3069 /* We never were connected? Don't hang in inotify for good, as there's no timeout set for it */
3070 if (bus->state == BUS_WATCH_BIND)
3071 return -EUNATCH;
3072
3073 r = bus_ensure_running(bus);
3074 if (r < 0)
3075 return r;
3076
3077 if (bus->wqueue_size <= 0)
3078 return 0;
3079
3080 for (;;) {
3081 r = dispatch_wqueue(bus);
3082 if (r < 0) {
3083 if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) {
3084 bus_enter_closing(bus);
3085 return -ECONNRESET;
3086 }
3087
3088 return r;
3089 }
3090
3091 if (bus->wqueue_size <= 0)
3092 return 0;
3093
3094 r = bus_poll(bus, false, (uint64_t) -1);
3095 if (r < 0)
3096 return r;
3097 }
3098 }
3099
3100 _public_ int sd_bus_add_filter(
3101 sd_bus *bus,
3102 sd_bus_slot **slot,
3103 sd_bus_message_handler_t callback,
3104 void *userdata) {
3105
3106 sd_bus_slot *s;
3107
3108 assert_return(bus, -EINVAL);
3109 assert_return(bus = bus_resolve(bus), -ENOPKG);
3110 assert_return(callback, -EINVAL);
3111 assert_return(!bus_pid_changed(bus), -ECHILD);
3112
3113 s = bus_slot_allocate(bus, !slot, BUS_FILTER_CALLBACK, sizeof(struct filter_callback), userdata);
3114 if (!s)
3115 return -ENOMEM;
3116
3117 s->filter_callback.callback = callback;
3118
3119 bus->filter_callbacks_modified = true;
3120 LIST_PREPEND(callbacks, bus->filter_callbacks, &s->filter_callback);
3121
3122 if (slot)
3123 *slot = s;
3124
3125 return 0;
3126 }
3127
3128 static int add_match_callback(
3129 sd_bus_message *m,
3130 void *userdata,
3131 sd_bus_error *ret_error) {
3132
3133 sd_bus_slot *match_slot = userdata;
3134 bool failed = false;
3135 int r;
3136
3137 assert(m);
3138 assert(match_slot);
3139
3140 sd_bus_slot_ref(match_slot);
3141
3142 if (sd_bus_message_is_method_error(m, NULL)) {
3143 log_debug_errno(sd_bus_message_get_errno(m),
3144 "Unable to add match %s, failing connection: %s",
3145 match_slot->match_callback.match_string,
3146 sd_bus_message_get_error(m)->message);
3147
3148 failed = true;
3149 } else
3150 log_debug("Match %s successfully installed.", match_slot->match_callback.match_string);
3151
3152 if (match_slot->match_callback.install_callback) {
3153 sd_bus *bus;
3154
3155 bus = sd_bus_message_get_bus(m);
3156
3157 /* This function has been called as slot handler, and we want to call another slot handler. Let's
3158 * update the slot callback metadata temporarily with our own data, and then revert back to the old
3159 * values. */
3160
3161 assert(bus->current_slot == match_slot->match_callback.install_slot);
3162 assert(bus->current_handler == add_match_callback);
3163 assert(bus->current_userdata == userdata);
3164
3165 bus->current_slot = match_slot;
3166 bus->current_handler = match_slot->match_callback.install_callback;
3167 bus->current_userdata = match_slot->userdata;
3168
3169 r = match_slot->match_callback.install_callback(m, match_slot->userdata, ret_error);
3170
3171 bus->current_slot = match_slot->match_callback.install_slot;
3172 bus->current_handler = add_match_callback;
3173 bus->current_userdata = userdata;
3174
3175 match_slot->match_callback.install_slot = sd_bus_slot_unref(match_slot->match_callback.install_slot);
3176 } else {
3177 if (failed) /* Generic failure handling: destroy the connection */
3178 bus_enter_closing(sd_bus_message_get_bus(m));
3179
3180 r = 1;
3181 }
3182
3183 if (failed && match_slot->floating) {
3184 bus_slot_disconnect(match_slot);
3185 sd_bus_slot_unref(match_slot);
3186 }
3187
3188 sd_bus_slot_unref(match_slot);
3189
3190 return r;
3191 }
3192
3193 static int bus_add_match_full(
3194 sd_bus *bus,
3195 sd_bus_slot **slot,
3196 bool asynchronous,
3197 const char *match,
3198 sd_bus_message_handler_t callback,
3199 sd_bus_message_handler_t install_callback,
3200 void *userdata) {
3201
3202 struct bus_match_component *components = NULL;
3203 unsigned n_components = 0;
3204 sd_bus_slot *s = NULL;
3205 int r = 0;
3206
3207 assert_return(bus, -EINVAL);
3208 assert_return(bus = bus_resolve(bus), -ENOPKG);
3209 assert_return(match, -EINVAL);
3210 assert_return(!bus_pid_changed(bus), -ECHILD);
3211
3212 r = bus_match_parse(match, &components, &n_components);
3213 if (r < 0)
3214 goto finish;
3215
3216 s = bus_slot_allocate(bus, !slot, BUS_MATCH_CALLBACK, sizeof(struct match_callback), userdata);
3217 if (!s) {
3218 r = -ENOMEM;
3219 goto finish;
3220 }
3221
3222 s->match_callback.callback = callback;
3223 s->match_callback.install_callback = install_callback;
3224
3225 if (bus->bus_client) {
3226 enum bus_match_scope scope;
3227
3228 scope = bus_match_get_scope(components, n_components);
3229
3230 /* Do not install server-side matches for matches against the local service, interface or bus path. */
3231 if (scope != BUS_MATCH_LOCAL) {
3232
3233 /* We store the original match string, so that we can use it to remove the match again. */
3234
3235 s->match_callback.match_string = strdup(match);
3236 if (!s->match_callback.match_string) {
3237 r = -ENOMEM;
3238 goto finish;
3239 }
3240
3241 if (asynchronous)
3242 r = bus_add_match_internal_async(bus,
3243 &s->match_callback.install_slot,
3244 s->match_callback.match_string,
3245 add_match_callback,
3246 s);
3247 else
3248 r = bus_add_match_internal(bus, s->match_callback.match_string);
3249 if (r < 0)
3250 goto finish;
3251
3252 s->match_added = true;
3253 }
3254 }
3255
3256 bus->match_callbacks_modified = true;
3257 r = bus_match_add(&bus->match_callbacks, components, n_components, &s->match_callback);
3258 if (r < 0)
3259 goto finish;
3260
3261 if (slot)
3262 *slot = s;
3263 s = NULL;
3264
3265 finish:
3266 bus_match_parse_free(components, n_components);
3267 sd_bus_slot_unref(s);
3268
3269 return r;
3270 }
3271
3272 _public_ int sd_bus_add_match(
3273 sd_bus *bus,
3274 sd_bus_slot **slot,
3275 const char *match,
3276 sd_bus_message_handler_t callback,
3277 void *userdata) {
3278
3279 return bus_add_match_full(bus, slot, false, match, callback, NULL, userdata);
3280 }
3281
3282 _public_ int sd_bus_add_match_async(
3283 sd_bus *bus,
3284 sd_bus_slot **slot,
3285 const char *match,
3286 sd_bus_message_handler_t callback,
3287 sd_bus_message_handler_t install_callback,
3288 void *userdata) {
3289
3290 return bus_add_match_full(bus, slot, true, match, callback, install_callback, userdata);
3291 }
3292
3293 bool bus_pid_changed(sd_bus *bus) {
3294 assert(bus);
3295
3296 /* We don't support people creating a bus connection and
3297 * keeping it around over a fork(). Let's complain. */
3298
3299 return bus->original_pid != getpid_cached();
3300 }
3301
3302 static int io_callback(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
3303 sd_bus *bus = userdata;
3304 int r;
3305
3306 assert(bus);
3307
3308 /* Note that this is called both on input_fd, output_fd as well as inotify_fd events */
3309
3310 r = sd_bus_process(bus, NULL);
3311 if (r < 0) {
3312 log_debug_errno(r, "Processing of bus failed, closing down: %m");
3313 bus_enter_closing(bus);
3314 }
3315
3316 return 1;
3317 }
3318
3319 static int time_callback(sd_event_source *s, uint64_t usec, void *userdata) {
3320 sd_bus *bus = userdata;
3321 int r;
3322
3323 assert(bus);
3324
3325 r = sd_bus_process(bus, NULL);
3326 if (r < 0) {
3327 log_debug_errno(r, "Processing of bus failed, closing down: %m");
3328 bus_enter_closing(bus);
3329 }
3330
3331 return 1;
3332 }
3333
3334 static int prepare_callback(sd_event_source *s, void *userdata) {
3335 sd_bus *bus = userdata;
3336 int r, e;
3337 usec_t until;
3338
3339 assert(s);
3340 assert(bus);
3341
3342 e = sd_bus_get_events(bus);
3343 if (e < 0) {
3344 r = e;
3345 goto fail;
3346 }
3347
3348 if (bus->output_fd != bus->input_fd) {
3349
3350 r = sd_event_source_set_io_events(bus->input_io_event_source, e & POLLIN);
3351 if (r < 0)
3352 goto fail;
3353
3354 r = sd_event_source_set_io_events(bus->output_io_event_source, e & POLLOUT);
3355 } else
3356 r = sd_event_source_set_io_events(bus->input_io_event_source, e);
3357 if (r < 0)
3358 goto fail;
3359
3360 r = sd_bus_get_timeout(bus, &until);
3361 if (r < 0)
3362 goto fail;
3363 if (r > 0) {
3364 int j;
3365
3366 j = sd_event_source_set_time(bus->time_event_source, until);
3367 if (j < 0) {
3368 r = j;
3369 goto fail;
3370 }
3371 }
3372
3373 r = sd_event_source_set_enabled(bus->time_event_source, r > 0);
3374 if (r < 0)
3375 goto fail;
3376
3377 return 1;
3378
3379 fail:
3380 log_debug_errno(r, "Preparing of bus events failed, closing down: %m");
3381 bus_enter_closing(bus);
3382
3383 return 1;
3384 }
3385
3386 static int quit_callback(sd_event_source *event, void *userdata) {
3387 sd_bus *bus = userdata;
3388
3389 assert(event);
3390
3391 sd_bus_flush(bus);
3392 sd_bus_close(bus);
3393
3394 return 1;
3395 }
3396
3397 int bus_attach_io_events(sd_bus *bus) {
3398 int r;
3399
3400 assert(bus);
3401
3402 if (bus->input_fd < 0)
3403 return 0;
3404
3405 if (!bus->event)
3406 return 0;
3407
3408 if (!bus->input_io_event_source) {
3409 r = sd_event_add_io(bus->event, &bus->input_io_event_source, bus->input_fd, 0, io_callback, bus);
3410 if (r < 0)
3411 return r;
3412
3413 r = sd_event_source_set_prepare(bus->input_io_event_source, prepare_callback);
3414 if (r < 0)
3415 return r;
3416
3417 r = sd_event_source_set_priority(bus->input_io_event_source, bus->event_priority);
3418 if (r < 0)
3419 return r;
3420
3421 r = sd_event_source_set_description(bus->input_io_event_source, "bus-input");
3422 } else
3423 r = sd_event_source_set_io_fd(bus->input_io_event_source, bus->input_fd);
3424
3425 if (r < 0)
3426 return r;
3427
3428 if (bus->output_fd != bus->input_fd) {
3429 assert(bus->output_fd >= 0);
3430
3431 if (!bus->output_io_event_source) {
3432 r = sd_event_add_io(bus->event, &bus->output_io_event_source, bus->output_fd, 0, io_callback, bus);
3433 if (r < 0)
3434 return r;
3435
3436 r = sd_event_source_set_priority(bus->output_io_event_source, bus->event_priority);
3437 if (r < 0)
3438 return r;
3439
3440 r = sd_event_source_set_description(bus->input_io_event_source, "bus-output");
3441 } else
3442 r = sd_event_source_set_io_fd(bus->output_io_event_source, bus->output_fd);
3443
3444 if (r < 0)
3445 return r;
3446 }
3447
3448 return 0;
3449 }
3450
3451 static void bus_detach_io_events(sd_bus *bus) {
3452 assert(bus);
3453
3454 if (bus->input_io_event_source) {
3455 sd_event_source_set_enabled(bus->input_io_event_source, SD_EVENT_OFF);
3456 bus->input_io_event_source = sd_event_source_unref(bus->input_io_event_source);
3457 }
3458
3459 if (bus->output_io_event_source) {
3460 sd_event_source_set_enabled(bus->output_io_event_source, SD_EVENT_OFF);
3461 bus->output_io_event_source = sd_event_source_unref(bus->output_io_event_source);
3462 }
3463 }
3464
3465 int bus_attach_inotify_event(sd_bus *bus) {
3466 int r;
3467
3468 assert(bus);
3469
3470 if (bus->inotify_fd < 0)
3471 return 0;
3472
3473 if (!bus->event)
3474 return 0;
3475
3476 if (!bus->inotify_event_source) {
3477 r = sd_event_add_io(bus->event, &bus->inotify_event_source, bus->inotify_fd, EPOLLIN, io_callback, bus);
3478 if (r < 0)
3479 return r;
3480
3481 r = sd_event_source_set_priority(bus->inotify_event_source, bus->event_priority);
3482 if (r < 0)
3483 return r;
3484
3485 r = sd_event_source_set_description(bus->inotify_event_source, "bus-inotify");
3486 } else
3487 r = sd_event_source_set_io_fd(bus->inotify_event_source, bus->inotify_fd);
3488 if (r < 0)
3489 return r;
3490
3491 return 0;
3492 }
3493
3494 static void bus_detach_inotify_event(sd_bus *bus) {
3495 assert(bus);
3496
3497 if (bus->inotify_event_source) {
3498 sd_event_source_set_enabled(bus->inotify_event_source, SD_EVENT_OFF);
3499 bus->inotify_event_source = sd_event_source_unref(bus->inotify_event_source);
3500 }
3501 }
3502
3503 _public_ int sd_bus_attach_event(sd_bus *bus, sd_event *event, int priority) {
3504 int r;
3505
3506 assert_return(bus, -EINVAL);
3507 assert_return(bus = bus_resolve(bus), -ENOPKG);
3508 assert_return(!bus->event, -EBUSY);
3509
3510 assert(!bus->input_io_event_source);
3511 assert(!bus->output_io_event_source);
3512 assert(!bus->time_event_source);
3513
3514 if (event)
3515 bus->event = sd_event_ref(event);
3516 else {
3517 r = sd_event_default(&bus->event);
3518 if (r < 0)
3519 return r;
3520 }
3521
3522 bus->event_priority = priority;
3523
3524 r = sd_event_add_time(bus->event, &bus->time_event_source, CLOCK_MONOTONIC, 0, 0, time_callback, bus);
3525 if (r < 0)
3526 goto fail;
3527
3528 r = sd_event_source_set_priority(bus->time_event_source, priority);
3529 if (r < 0)
3530 goto fail;
3531
3532 r = sd_event_source_set_description(bus->time_event_source, "bus-time");
3533 if (r < 0)
3534 goto fail;
3535
3536 r = sd_event_add_exit(bus->event, &bus->quit_event_source, quit_callback, bus);
3537 if (r < 0)
3538 goto fail;
3539
3540 r = sd_event_source_set_description(bus->quit_event_source, "bus-exit");
3541 if (r < 0)
3542 goto fail;
3543
3544 r = bus_attach_io_events(bus);
3545 if (r < 0)
3546 goto fail;
3547
3548 r = bus_attach_inotify_event(bus);
3549 if (r < 0)
3550 goto fail;
3551
3552 return 0;
3553
3554 fail:
3555 sd_bus_detach_event(bus);
3556 return r;
3557 }
3558
3559 _public_ int sd_bus_detach_event(sd_bus *bus) {
3560 assert_return(bus, -EINVAL);
3561 assert_return(bus = bus_resolve(bus), -ENOPKG);
3562
3563 if (!bus->event)
3564 return 0;
3565
3566 bus_detach_io_events(bus);
3567 bus_detach_inotify_event(bus);
3568
3569 if (bus->time_event_source) {
3570 sd_event_source_set_enabled(bus->time_event_source, SD_EVENT_OFF);
3571 bus->time_event_source = sd_event_source_unref(bus->time_event_source);
3572 }
3573
3574 if (bus->quit_event_source) {
3575 sd_event_source_set_enabled(bus->quit_event_source, SD_EVENT_OFF);
3576 bus->quit_event_source = sd_event_source_unref(bus->quit_event_source);
3577 }
3578
3579 bus->event = sd_event_unref(bus->event);
3580 return 1;
3581 }
3582
3583 _public_ sd_event* sd_bus_get_event(sd_bus *bus) {
3584 assert_return(bus, NULL);
3585
3586 return bus->event;
3587 }
3588
3589 _public_ sd_bus_message* sd_bus_get_current_message(sd_bus *bus) {
3590 assert_return(bus, NULL);
3591
3592 return bus->current_message;
3593 }
3594
3595 _public_ sd_bus_slot* sd_bus_get_current_slot(sd_bus *bus) {
3596 assert_return(bus, NULL);
3597
3598 return bus->current_slot;
3599 }
3600
3601 _public_ sd_bus_message_handler_t sd_bus_get_current_handler(sd_bus *bus) {
3602 assert_return(bus, NULL);
3603
3604 return bus->current_handler;
3605 }
3606
3607 _public_ void* sd_bus_get_current_userdata(sd_bus *bus) {
3608 assert_return(bus, NULL);
3609
3610 return bus->current_userdata;
3611 }
3612
3613 static int bus_default(int (*bus_open)(sd_bus **), sd_bus **default_bus, sd_bus **ret) {
3614 sd_bus *b = NULL;
3615 int r;
3616
3617 assert(bus_open);
3618 assert(default_bus);
3619
3620 if (!ret)
3621 return !!*default_bus;
3622
3623 if (*default_bus) {
3624 *ret = sd_bus_ref(*default_bus);
3625 return 0;
3626 }
3627
3628 r = bus_open(&b);
3629 if (r < 0)
3630 return r;
3631
3632 b->default_bus_ptr = default_bus;
3633 b->tid = gettid();
3634 *default_bus = b;
3635
3636 *ret = b;
3637 return 1;
3638 }
3639
3640 _public_ int sd_bus_default_system(sd_bus **ret) {
3641 return bus_default(sd_bus_open_system, &default_system_bus, ret);
3642 }
3643
3644 _public_ int sd_bus_default_user(sd_bus **ret) {
3645 return bus_default(sd_bus_open_user, &default_user_bus, ret);
3646 }
3647
3648 _public_ int sd_bus_default(sd_bus **ret) {
3649 int (*bus_open)(sd_bus **) = NULL;
3650 sd_bus **busp;
3651
3652 busp = bus_choose_default(&bus_open);
3653 return bus_default(bus_open, busp, ret);
3654 }
3655
3656 _public_ int sd_bus_get_tid(sd_bus *b, pid_t *tid) {
3657 assert_return(b, -EINVAL);
3658 assert_return(tid, -EINVAL);
3659 assert_return(!bus_pid_changed(b), -ECHILD);
3660
3661 if (b->tid != 0) {
3662 *tid = b->tid;
3663 return 0;
3664 }
3665
3666 if (b->event)
3667 return sd_event_get_tid(b->event, tid);
3668
3669 return -ENXIO;
3670 }
3671
3672 _public_ int sd_bus_path_encode(const char *prefix, const char *external_id, char **ret_path) {
3673 _cleanup_free_ char *e = NULL;
3674 char *ret;
3675
3676 assert_return(object_path_is_valid(prefix), -EINVAL);
3677 assert_return(external_id, -EINVAL);
3678 assert_return(ret_path, -EINVAL);
3679
3680 e = bus_label_escape(external_id);
3681 if (!e)
3682 return -ENOMEM;
3683
3684 ret = strjoin(prefix, "/", e);
3685 if (!ret)
3686 return -ENOMEM;
3687
3688 *ret_path = ret;
3689 return 0;
3690 }
3691
3692 _public_ int sd_bus_path_decode(const char *path, const char *prefix, char **external_id) {
3693 const char *e;
3694 char *ret;
3695
3696 assert_return(object_path_is_valid(path), -EINVAL);
3697 assert_return(object_path_is_valid(prefix), -EINVAL);
3698 assert_return(external_id, -EINVAL);
3699
3700 e = object_path_startswith(path, prefix);
3701 if (!e) {
3702 *external_id = NULL;
3703 return 0;
3704 }
3705
3706 ret = bus_label_unescape(e);
3707 if (!ret)
3708 return -ENOMEM;
3709
3710 *external_id = ret;
3711 return 1;
3712 }
3713
3714 _public_ int sd_bus_path_encode_many(char **out, const char *path_template, ...) {
3715 _cleanup_strv_free_ char **labels = NULL;
3716 char *path, *path_pos, **label_pos;
3717 const char *sep, *template_pos;
3718 size_t path_length;
3719 va_list list;
3720 int r;
3721
3722 assert_return(out, -EINVAL);
3723 assert_return(path_template, -EINVAL);
3724
3725 path_length = strlen(path_template);
3726
3727 va_start(list, path_template);
3728 for (sep = strchr(path_template, '%'); sep; sep = strchr(sep + 1, '%')) {
3729 const char *arg;
3730 char *label;
3731
3732 arg = va_arg(list, const char *);
3733 if (!arg) {
3734 va_end(list);
3735 return -EINVAL;
3736 }
3737
3738 label = bus_label_escape(arg);
3739 if (!label) {
3740 va_end(list);
3741 return -ENOMEM;
3742 }
3743
3744 r = strv_consume(&labels, label);
3745 if (r < 0) {
3746 va_end(list);
3747 return r;
3748 }
3749
3750 /* add label length, but account for the format character */
3751 path_length += strlen(label) - 1;
3752 }
3753 va_end(list);
3754
3755 path = malloc(path_length + 1);
3756 if (!path)
3757 return -ENOMEM;
3758
3759 path_pos = path;
3760 label_pos = labels;
3761
3762 for (template_pos = path_template; *template_pos; ) {
3763 sep = strchrnul(template_pos, '%');
3764 path_pos = mempcpy(path_pos, template_pos, sep - template_pos);
3765 if (!*sep)
3766 break;
3767
3768 path_pos = stpcpy(path_pos, *label_pos++);
3769 template_pos = sep + 1;
3770 }
3771
3772 *path_pos = 0;
3773 *out = path;
3774 return 0;
3775 }
3776
3777 _public_ int sd_bus_path_decode_many(const char *path, const char *path_template, ...) {
3778 _cleanup_strv_free_ char **labels = NULL;
3779 const char *template_pos, *path_pos;
3780 char **label_pos;
3781 va_list list;
3782 int r;
3783
3784 /*
3785 * This decodes an object-path based on a template argument. The
3786 * template consists of a verbatim path, optionally including special
3787 * directives:
3788 *
3789 * - Each occurrence of '%' in the template matches an arbitrary
3790 * substring of a label in the given path. At most one such
3791 * directive is allowed per label. For each such directive, the
3792 * caller must provide an output parameter (char **) via va_arg. If
3793 * NULL is passed, the given label is verified, but not returned.
3794 * For each matched label, the *decoded* label is stored in the
3795 * passed output argument, and the caller is responsible to free
3796 * it. Note that the output arguments are only modified if the
3797 * actualy path matched the template. Otherwise, they're left
3798 * untouched.
3799 *
3800 * This function returns <0 on error, 0 if the path does not match the
3801 * template, 1 if it matched.
3802 */
3803
3804 assert_return(path, -EINVAL);
3805 assert_return(path_template, -EINVAL);
3806
3807 path_pos = path;
3808
3809 for (template_pos = path_template; *template_pos; ) {
3810 const char *sep;
3811 size_t length;
3812 char *label;
3813
3814 /* verify everything until the next '%' matches verbatim */
3815 sep = strchrnul(template_pos, '%');
3816 length = sep - template_pos;
3817 if (strncmp(path_pos, template_pos, length))
3818 return 0;
3819
3820 path_pos += length;
3821 template_pos += length;
3822
3823 if (!*template_pos)
3824 break;
3825
3826 /* We found the next '%' character. Everything up until here
3827 * matched. We now skip ahead to the end of this label and make
3828 * sure it matches the tail of the label in the path. Then we
3829 * decode the string in-between and save it for later use. */
3830
3831 ++template_pos; /* skip over '%' */
3832
3833 sep = strchrnul(template_pos, '/');
3834 length = sep - template_pos; /* length of suffix to match verbatim */
3835
3836 /* verify the suffixes match */
3837 sep = strchrnul(path_pos, '/');
3838 if (sep - path_pos < (ssize_t)length ||
3839 strncmp(sep - length, template_pos, length))
3840 return 0;
3841
3842 template_pos += length; /* skip over matched label */
3843 length = sep - path_pos - length; /* length of sub-label to decode */
3844
3845 /* store unescaped label for later use */
3846 label = bus_label_unescape_n(path_pos, length);
3847 if (!label)
3848 return -ENOMEM;
3849
3850 r = strv_consume(&labels, label);
3851 if (r < 0)
3852 return r;
3853
3854 path_pos = sep; /* skip decoded label and suffix */
3855 }
3856
3857 /* end of template must match end of path */
3858 if (*path_pos)
3859 return 0;
3860
3861 /* copy the labels over to the caller */
3862 va_start(list, path_template);
3863 for (label_pos = labels; label_pos && *label_pos; ++label_pos) {
3864 char **arg;
3865
3866 arg = va_arg(list, char **);
3867 if (arg)
3868 *arg = *label_pos;
3869 else
3870 free(*label_pos);
3871 }
3872 va_end(list);
3873
3874 labels = mfree(labels);
3875 return 1;
3876 }
3877
3878 _public_ int sd_bus_try_close(sd_bus *bus) {
3879 assert_return(bus, -EINVAL);
3880 assert_return(bus = bus_resolve(bus), -ENOPKG);
3881 assert_return(!bus_pid_changed(bus), -ECHILD);
3882
3883 return -EOPNOTSUPP;
3884 }
3885
3886 _public_ int sd_bus_get_description(sd_bus *bus, const char **description) {
3887 assert_return(bus, -EINVAL);
3888 assert_return(bus = bus_resolve(bus), -ENOPKG);
3889 assert_return(description, -EINVAL);
3890 assert_return(bus->description, -ENXIO);
3891 assert_return(!bus_pid_changed(bus), -ECHILD);
3892
3893 if (bus->description)
3894 *description = bus->description;
3895 else if (bus->is_system)
3896 *description = "system";
3897 else if (bus->is_user)
3898 *description = "user";
3899 else
3900 *description = NULL;
3901
3902 return 0;
3903 }
3904
3905 int bus_get_root_path(sd_bus *bus) {
3906 int r;
3907
3908 if (bus->cgroup_root)
3909 return 0;
3910
3911 r = cg_get_root_path(&bus->cgroup_root);
3912 if (r == -ENOENT) {
3913 bus->cgroup_root = strdup("/");
3914 if (!bus->cgroup_root)
3915 return -ENOMEM;
3916
3917 r = 0;
3918 }
3919
3920 return r;
3921 }
3922
3923 _public_ int sd_bus_get_scope(sd_bus *bus, const char **scope) {
3924 assert_return(bus, -EINVAL);
3925 assert_return(bus = bus_resolve(bus), -ENOPKG);
3926 assert_return(scope, -EINVAL);
3927 assert_return(!bus_pid_changed(bus), -ECHILD);
3928
3929 if (bus->is_user) {
3930 *scope = "user";
3931 return 0;
3932 }
3933
3934 if (bus->is_system) {
3935 *scope = "system";
3936 return 0;
3937 }
3938
3939 return -ENODATA;
3940 }
3941
3942 _public_ int sd_bus_get_address(sd_bus *bus, const char **address) {
3943
3944 assert_return(bus, -EINVAL);
3945 assert_return(bus = bus_resolve(bus), -ENOPKG);
3946 assert_return(address, -EINVAL);
3947 assert_return(!bus_pid_changed(bus), -ECHILD);
3948
3949 if (bus->address) {
3950 *address = bus->address;
3951 return 0;
3952 }
3953
3954 return -ENODATA;
3955 }
3956
3957 _public_ int sd_bus_get_creds_mask(sd_bus *bus, uint64_t *mask) {
3958 assert_return(bus, -EINVAL);
3959 assert_return(bus = bus_resolve(bus), -ENOPKG);
3960 assert_return(mask, -EINVAL);
3961 assert_return(!bus_pid_changed(bus), -ECHILD);
3962
3963 *mask = bus->creds_mask;
3964 return 0;
3965 }
3966
3967 _public_ int sd_bus_is_bus_client(sd_bus *bus) {
3968 assert_return(bus, -EINVAL);
3969 assert_return(bus = bus_resolve(bus), -ENOPKG);
3970 assert_return(!bus_pid_changed(bus), -ECHILD);
3971
3972 return bus->bus_client;
3973 }
3974
3975 _public_ int sd_bus_is_server(sd_bus *bus) {
3976 assert_return(bus, -EINVAL);
3977 assert_return(bus = bus_resolve(bus), -ENOPKG);
3978 assert_return(!bus_pid_changed(bus), -ECHILD);
3979
3980 return bus->is_server;
3981 }
3982
3983 _public_ int sd_bus_is_anonymous(sd_bus *bus) {
3984 assert_return(bus, -EINVAL);
3985 assert_return(bus = bus_resolve(bus), -ENOPKG);
3986 assert_return(!bus_pid_changed(bus), -ECHILD);
3987
3988 return bus->anonymous_auth;
3989 }
3990
3991 _public_ int sd_bus_is_trusted(sd_bus *bus) {
3992 assert_return(bus, -EINVAL);
3993 assert_return(bus = bus_resolve(bus), -ENOPKG);
3994 assert_return(!bus_pid_changed(bus), -ECHILD);
3995
3996 return bus->trusted;
3997 }
3998
3999 _public_ int sd_bus_is_monitor(sd_bus *bus) {
4000 assert_return(bus, -EINVAL);
4001 assert_return(bus = bus_resolve(bus), -ENOPKG);
4002 assert_return(!bus_pid_changed(bus), -ECHILD);
4003
4004 return bus->is_monitor;
4005 }
4006
4007 static void flush_close(sd_bus *bus) {
4008 if (!bus)
4009 return;
4010
4011 /* Flushes and closes the specified bus. We take a ref before,
4012 * to ensure the flushing does not cause the bus to be
4013 * unreferenced. */
4014
4015 sd_bus_flush_close_unref(sd_bus_ref(bus));
4016 }
4017
4018 _public_ void sd_bus_default_flush_close(void) {
4019 flush_close(default_starter_bus);
4020 flush_close(default_user_bus);
4021 flush_close(default_system_bus);
4022 }
4023
4024 _public_ int sd_bus_set_exit_on_disconnect(sd_bus *bus, int b) {
4025 assert_return(bus, -EINVAL);
4026 assert_return(bus = bus_resolve(bus), -ENOPKG);
4027
4028 /* Turns on exit-on-disconnect, and triggers it immediately if the bus connection was already
4029 * disconnected. Note that this is triggered exclusively on disconnections triggered by the server side, never
4030 * from the client side. */
4031 bus->exit_on_disconnect = b;
4032
4033 /* If the exit condition was triggered already, exit immediately. */
4034 return bus_exit_now(bus);
4035 }
4036
4037 _public_ int sd_bus_get_exit_on_disconnect(sd_bus *bus) {
4038 assert_return(bus, -EINVAL);
4039 assert_return(bus = bus_resolve(bus), -ENOPKG);
4040
4041 return bus->exit_on_disconnect;
4042 }
4043
4044 _public_ int sd_bus_set_sender(sd_bus *bus, const char *sender) {
4045 assert_return(bus, -EINVAL);
4046 assert_return(bus = bus_resolve(bus), -ENOPKG);
4047 assert_return(!bus->bus_client, -EPERM);
4048 assert_return(!sender || service_name_is_valid(sender), -EINVAL);
4049
4050 return free_and_strdup(&bus->patch_sender, sender);
4051 }
4052
4053 _public_ int sd_bus_get_sender(sd_bus *bus, const char **ret) {
4054 assert_return(bus, -EINVAL);
4055 assert_return(bus = bus_resolve(bus), -ENOPKG);
4056 assert_return(ret, -EINVAL);
4057
4058 if (!bus->patch_sender)
4059 return -ENODATA;
4060
4061 *ret = bus->patch_sender;
4062 return 0;
4063 }
4064
4065 _public_ int sd_bus_get_n_queued_read(sd_bus *bus, uint64_t *ret) {
4066 assert_return(bus, -EINVAL);
4067 assert_return(bus = bus_resolve(bus), -ENOPKG);
4068 assert_return(!bus_pid_changed(bus), -ECHILD);
4069 assert_return(ret, -EINVAL);
4070
4071 *ret = bus->rqueue_size;
4072 return 0;
4073 }
4074
4075 _public_ int sd_bus_get_n_queued_write(sd_bus *bus, uint64_t *ret) {
4076 assert_return(bus, -EINVAL);
4077 assert_return(bus = bus_resolve(bus), -ENOPKG);
4078 assert_return(!bus_pid_changed(bus), -ECHILD);
4079 assert_return(ret, -EINVAL);
4080
4081 *ret = bus->wqueue_size;
4082 return 0;
4083 }
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