]> git.ipfire.org Git - thirdparty/systemd.git/blob - src/libsystemd/sd-bus/sd-bus.c
projects / thirdparty / systemd.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
sd-bus: add debug logs where we try to connect
[thirdparty/systemd.git] / src / libsystemd / sd-bus / sd-bus.c
1 /* SPDX-License-Identifier: LGPL-2.1+ */
2
3 #include <endian.h>
4 #include <netdb.h>
5 #include <poll.h>
6 #include <pthread.h>
7 #include <signal.h>
8 #include <stdlib.h>
9 #include <sys/mman.h>
10 #include <sys/stat.h>
11 #include <sys/wait.h>
12 #include <unistd.h>
13
14 #include "sd-bus.h"
15
16 #include "alloc-util.h"
17 #include "bus-container.h"
18 #include "bus-control.h"
19 #include "bus-internal.h"
20 #include "bus-kernel.h"
21 #include "bus-label.h"
22 #include "bus-message.h"
23 #include "bus-objects.h"
24 #include "bus-protocol.h"
25 #include "bus-slot.h"
26 #include "bus-socket.h"
27 #include "bus-track.h"
28 #include "bus-type.h"
29 #include "bus-util.h"
30 #include "cgroup-util.h"
31 #include "def.h"
32 #include "errno-util.h"
33 #include "fd-util.h"
34 #include "hexdecoct.h"
35 #include "hostname-util.h"
36 #include "macro.h"
37 #include "memory-util.h"
38 #include "missing_syscall.h"
39 #include "parse-util.h"
40 #include "path-util.h"
41 #include "process-util.h"
42 #include "string-util.h"
43 #include "strv.h"
44
45 #define log_debug_bus_message(m) \
46 do { \
47 sd_bus_message *_mm = (m); \
48 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", \
49 bus_message_type_to_string(_mm->header->type), \
50 strna(sd_bus_message_get_sender(_mm)), \
51 strna(sd_bus_message_get_destination(_mm)), \
52 strna(sd_bus_message_get_path(_mm)), \
53 strna(sd_bus_message_get_interface(_mm)), \
54 strna(sd_bus_message_get_member(_mm)), \
55 BUS_MESSAGE_COOKIE(_mm), \
56 _mm->reply_cookie, \
57 strna(_mm->root_container.signature), \
58 strna(_mm->error.name), \
59 strna(_mm->error.message)); \
60 } while (false)
61
62 static int bus_poll(sd_bus *bus, bool need_more, uint64_t timeout_usec);
63 static void bus_detach_io_events(sd_bus *b);
64 static void bus_detach_inotify_event(sd_bus *b);
65
66 static thread_local sd_bus *default_system_bus = NULL;
67 static thread_local sd_bus *default_user_bus = NULL;
68 static thread_local sd_bus *default_starter_bus = NULL;
69
70 static sd_bus **bus_choose_default(int (**bus_open)(sd_bus **)) {
71 const char *e;
72
73 /* Let's try our best to reuse another cached connection. If
74 * the starter bus type is set, connect via our normal
75 * connection logic, ignoring $DBUS_STARTER_ADDRESS, so that
76 * we can share the connection with the user/system default
77 * bus. */
78
79 e = secure_getenv("DBUS_STARTER_BUS_TYPE");
80 if (e) {
81 if (streq(e, "system")) {
82 if (bus_open)
83 *bus_open = sd_bus_open_system;
84 return &default_system_bus;
85 } else if (STR_IN_SET(e, "user", "session")) {
86 if (bus_open)
87 *bus_open = sd_bus_open_user;
88 return &default_user_bus;
89 }
90 }
91
92 /* No type is specified, so we have not other option than to
93 * use the starter address if it is set. */
94 e = secure_getenv("DBUS_STARTER_ADDRESS");
95 if (e) {
96 if (bus_open)
97 *bus_open = sd_bus_open;
98 return &default_starter_bus;
99 }
100
101 /* Finally, if nothing is set use the cached connection for
102 * the right scope */
103
104 if (cg_pid_get_owner_uid(0, NULL) >= 0) {
105 if (bus_open)
106 *bus_open = sd_bus_open_user;
107 return &default_user_bus;
108 } else {
109 if (bus_open)
110 *bus_open = sd_bus_open_system;
111 return &default_system_bus;
112 }
113 }
114
115 sd_bus *bus_resolve(sd_bus *bus) {
116 switch ((uintptr_t) bus) {
117 case (uintptr_t) SD_BUS_DEFAULT:
118 return *(bus_choose_default(NULL));
119 case (uintptr_t) SD_BUS_DEFAULT_USER:
120 return default_user_bus;
121 case (uintptr_t) SD_BUS_DEFAULT_SYSTEM:
122 return default_system_bus;
123 default:
124 return bus;
125 }
126 }
127
128 void bus_close_io_fds(sd_bus *b) {
129 assert(b);
130
131 bus_detach_io_events(b);
132
133 if (b->input_fd != b->output_fd)
134 safe_close(b->output_fd);
135 b->output_fd = b->input_fd = safe_close(b->input_fd);
136 }
137
138 void bus_close_inotify_fd(sd_bus *b) {
139 assert(b);
140
141 bus_detach_inotify_event(b);
142
143 b->inotify_fd = safe_close(b->inotify_fd);
144 b->inotify_watches = mfree(b->inotify_watches);
145 b->n_inotify_watches = 0;
146 }
147
148 static void bus_reset_queues(sd_bus *b) {
149 assert(b);
150
151 while (b->rqueue_size > 0)
152 bus_message_unref_queued(b->rqueue[--b->rqueue_size], b);
153
154 b->rqueue = mfree(b->rqueue);
155 b->rqueue_allocated = 0;
156
157 while (b->wqueue_size > 0)
158 bus_message_unref_queued(b->wqueue[--b->wqueue_size], b);
159
160 b->wqueue = mfree(b->wqueue);
161 b->wqueue_allocated = 0;
162 }
163
164 static sd_bus* bus_free(sd_bus *b) {
165 sd_bus_slot *s;
166
167 assert(b);
168 assert(!b->track_queue);
169 assert(!b->tracks);
170
171 b->state = BUS_CLOSED;
172
173 sd_bus_detach_event(b);
174
175 while ((s = b->slots)) {
176 /* At this point only floating slots can still be
177 * around, because the non-floating ones keep a
178 * reference to the bus, and we thus couldn't be
179 * destructing right now... We forcibly disconnect the
180 * slots here, so that they still can be referenced by
181 * apps, but are dead. */
182
183 assert(s->floating);
184 bus_slot_disconnect(s, true);
185 }
186
187 if (b->default_bus_ptr)
188 *b->default_bus_ptr = NULL;
189
190 bus_close_io_fds(b);
191 bus_close_inotify_fd(b);
192
193 free(b->label);
194 free(b->groups);
195 free(b->rbuffer);
196 free(b->unique_name);
197 free(b->auth_buffer);
198 free(b->address);
199 free(b->machine);
200 free(b->description);
201 free(b->patch_sender);
202
203 free(b->exec_path);
204 strv_free(b->exec_argv);
205
206 close_many(b->fds, b->n_fds);
207 free(b->fds);
208
209 bus_reset_queues(b);
210
211 ordered_hashmap_free_free(b->reply_callbacks);
212 prioq_free(b->reply_callbacks_prioq);
213
214 assert(b->match_callbacks.type == BUS_MATCH_ROOT);
215 bus_match_free(&b->match_callbacks);
216
217 hashmap_free_free(b->vtable_methods);
218 hashmap_free_free(b->vtable_properties);
219
220 assert(hashmap_isempty(b->nodes));
221 hashmap_free(b->nodes);
222
223 bus_flush_memfd(b);
224
225 assert_se(pthread_mutex_destroy(&b->memfd_cache_mutex) == 0);
226
227 return mfree(b);
228 }
229
230 DEFINE_TRIVIAL_CLEANUP_FUNC(sd_bus*, bus_free);
231
232 _public_ int sd_bus_new(sd_bus **ret) {
233 _cleanup_free_ sd_bus *b = NULL;
234
235 assert_return(ret, -EINVAL);
236
237 b = new(sd_bus, 1);
238 if (!b)
239 return -ENOMEM;
240
241 *b = (sd_bus) {
242 .n_ref = 1,
243 .input_fd = -1,
244 .output_fd = -1,
245 .inotify_fd = -1,
246 .message_version = 1,
247 .creds_mask = SD_BUS_CREDS_WELL_KNOWN_NAMES|SD_BUS_CREDS_UNIQUE_NAME,
248 .accept_fd = true,
249 .original_pid = getpid_cached(),
250 .n_groups = (size_t) -1,
251 .close_on_exit = true,
252 };
253
254 /* We guarantee that wqueue always has space for at least one entry */
255 if (!GREEDY_REALLOC(b->wqueue, b->wqueue_allocated, 1))
256 return -ENOMEM;
257
258 assert_se(pthread_mutex_init(&b->memfd_cache_mutex, NULL) == 0);
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 assert_return(bus, -EINVAL);
266 assert_return(bus = bus_resolve(bus), -ENOPKG);
267 assert_return(bus->state == BUS_UNSET, -EPERM);
268 assert_return(address, -EINVAL);
269 assert_return(!bus_pid_changed(bus), -ECHILD);
270
271 return free_and_strdup(&bus->address, address);
272 }
273
274 _public_ int sd_bus_set_fd(sd_bus *bus, int input_fd, int output_fd) {
275 assert_return(bus, -EINVAL);
276 assert_return(bus = bus_resolve(bus), -ENOPKG);
277 assert_return(bus->state == BUS_UNSET, -EPERM);
278 assert_return(input_fd >= 0, -EBADF);
279 assert_return(output_fd >= 0, -EBADF);
280 assert_return(!bus_pid_changed(bus), -ECHILD);
281
282 bus->input_fd = input_fd;
283 bus->output_fd = output_fd;
284 return 0;
285 }
286
287 _public_ int sd_bus_set_exec(sd_bus *bus, const char *path, char *const *argv) {
288 _cleanup_strv_free_ char **a = NULL;
289 int r;
290
291 assert_return(bus, -EINVAL);
292 assert_return(bus = bus_resolve(bus), -ENOPKG);
293 assert_return(bus->state == BUS_UNSET, -EPERM);
294 assert_return(path, -EINVAL);
295 assert_return(!strv_isempty(argv), -EINVAL);
296 assert_return(!bus_pid_changed(bus), -ECHILD);
297
298 a = strv_copy(argv);
299 if (!a)
300 return -ENOMEM;
301
302 r = free_and_strdup(&bus->exec_path, path);
303 if (r < 0)
304 return r;
305
306 return strv_free_and_replace(bus->exec_argv, a);
307 }
308
309 _public_ int sd_bus_set_bus_client(sd_bus *bus, int b) {
310 assert_return(bus, -EINVAL);
311 assert_return(bus = bus_resolve(bus), -ENOPKG);
312 assert_return(bus->state == BUS_UNSET, -EPERM);
313 assert_return(!bus->patch_sender, -EPERM);
314 assert_return(!bus_pid_changed(bus), -ECHILD);
315
316 bus->bus_client = !!b;
317 return 0;
318 }
319
320 _public_ int sd_bus_set_monitor(sd_bus *bus, int b) {
321 assert_return(bus, -EINVAL);
322 assert_return(bus = bus_resolve(bus), -ENOPKG);
323 assert_return(bus->state == BUS_UNSET, -EPERM);
324 assert_return(!bus_pid_changed(bus), -ECHILD);
325
326 bus->is_monitor = !!b;
327 return 0;
328 }
329
330 _public_ int sd_bus_negotiate_fds(sd_bus *bus, int b) {
331 assert_return(bus, -EINVAL);
332 assert_return(bus = bus_resolve(bus), -ENOPKG);
333 assert_return(bus->state == BUS_UNSET, -EPERM);
334 assert_return(!bus_pid_changed(bus), -ECHILD);
335
336 bus->accept_fd = !!b;
337 return 0;
338 }
339
340 _public_ int sd_bus_negotiate_timestamp(sd_bus *bus, int b) {
341 assert_return(bus, -EINVAL);
342 assert_return(bus = bus_resolve(bus), -ENOPKG);
343 assert_return(!IN_SET(bus->state, BUS_CLOSING, BUS_CLOSED), -EPERM);
344 assert_return(!bus_pid_changed(bus), -ECHILD);
345
346 /* This is not actually supported by any of our transports these days, but we do honour it for synthetic
347 * replies, and maybe one day classic D-Bus learns this too */
348 bus->attach_timestamp = !!b;
349
350 return 0;
351 }
352
353 _public_ int sd_bus_negotiate_creds(sd_bus *bus, int b, uint64_t mask) {
354 assert_return(bus, -EINVAL);
355 assert_return(bus = bus_resolve(bus), -ENOPKG);
356 assert_return(mask <= _SD_BUS_CREDS_ALL, -EINVAL);
357 assert_return(!IN_SET(bus->state, BUS_CLOSING, BUS_CLOSED), -EPERM);
358 assert_return(!bus_pid_changed(bus), -ECHILD);
359
360 SET_FLAG(bus->creds_mask, mask, b);
361
362 /* The well knowns we need unconditionally, so that matches can work */
363 bus->creds_mask |= SD_BUS_CREDS_WELL_KNOWN_NAMES|SD_BUS_CREDS_UNIQUE_NAME;
364
365 return 0;
366 }
367
368 _public_ int sd_bus_set_server(sd_bus *bus, int b, sd_id128_t server_id) {
369 assert_return(bus, -EINVAL);
370 assert_return(bus = bus_resolve(bus), -ENOPKG);
371 assert_return(b || sd_id128_equal(server_id, SD_ID128_NULL), -EINVAL);
372 assert_return(bus->state == BUS_UNSET, -EPERM);
373 assert_return(!bus_pid_changed(bus), -ECHILD);
374
375 bus->is_server = !!b;
376 bus->server_id = server_id;
377 return 0;
378 }
379
380 _public_ int sd_bus_set_anonymous(sd_bus *bus, int b) {
381 assert_return(bus, -EINVAL);
382 assert_return(bus = bus_resolve(bus), -ENOPKG);
383 assert_return(bus->state == BUS_UNSET, -EPERM);
384 assert_return(!bus_pid_changed(bus), -ECHILD);
385
386 bus->anonymous_auth = !!b;
387 return 0;
388 }
389
390 _public_ int sd_bus_set_trusted(sd_bus *bus, int b) {
391 assert_return(bus, -EINVAL);
392 assert_return(bus = bus_resolve(bus), -ENOPKG);
393 assert_return(bus->state == BUS_UNSET, -EPERM);
394 assert_return(!bus_pid_changed(bus), -ECHILD);
395
396 bus->trusted = !!b;
397 return 0;
398 }
399
400 _public_ int sd_bus_set_description(sd_bus *bus, const char *description) {
401 assert_return(bus, -EINVAL);
402 assert_return(bus = bus_resolve(bus), -ENOPKG);
403 assert_return(bus->state == BUS_UNSET, -EPERM);
404 assert_return(!bus_pid_changed(bus), -ECHILD);
405
406 return free_and_strdup(&bus->description, description);
407 }
408
409 _public_ int sd_bus_set_allow_interactive_authorization(sd_bus *bus, int b) {
410 assert_return(bus, -EINVAL);
411 assert_return(bus = bus_resolve(bus), -ENOPKG);
412 assert_return(!bus_pid_changed(bus), -ECHILD);
413
414 bus->allow_interactive_authorization = !!b;
415 return 0;
416 }
417
418 _public_ int sd_bus_get_allow_interactive_authorization(sd_bus *bus) {
419 assert_return(bus, -EINVAL);
420 assert_return(bus = bus_resolve(bus), -ENOPKG);
421 assert_return(!bus_pid_changed(bus), -ECHILD);
422
423 return bus->allow_interactive_authorization;
424 }
425
426 _public_ int sd_bus_set_watch_bind(sd_bus *bus, int b) {
427 assert_return(bus, -EINVAL);
428 assert_return(bus = bus_resolve(bus), -ENOPKG);
429 assert_return(bus->state == BUS_UNSET, -EPERM);
430 assert_return(!bus_pid_changed(bus), -ECHILD);
431
432 bus->watch_bind = !!b;
433 return 0;
434 }
435
436 _public_ int sd_bus_get_watch_bind(sd_bus *bus) {
437 assert_return(bus, -EINVAL);
438 assert_return(bus = bus_resolve(bus), -ENOPKG);
439 assert_return(!bus_pid_changed(bus), -ECHILD);
440
441 return bus->watch_bind;
442 }
443
444 _public_ int sd_bus_set_connected_signal(sd_bus *bus, int b) {
445 assert_return(bus, -EINVAL);
446 assert_return(bus = bus_resolve(bus), -ENOPKG);
447 assert_return(bus->state == BUS_UNSET, -EPERM);
448 assert_return(!bus_pid_changed(bus), -ECHILD);
449
450 bus->connected_signal = !!b;
451 return 0;
452 }
453
454 _public_ int sd_bus_get_connected_signal(sd_bus *bus) {
455 assert_return(bus, -EINVAL);
456 assert_return(bus = bus_resolve(bus), -ENOPKG);
457 assert_return(!bus_pid_changed(bus), -ECHILD);
458
459 return bus->connected_signal;
460 }
461
462 static int synthesize_connected_signal(sd_bus *bus) {
463 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
464 int r;
465
466 assert(bus);
467
468 /* If enabled, synthesizes a local "Connected" signal mirroring the local "Disconnected" signal. This is called
469 * whenever we fully established a connection, i.e. after the authorization phase, and after receiving the
470 * Hello() reply. Or in other words, whenever we enter BUS_RUNNING state.
471 *
472 * This is useful so that clients can start doing stuff whenever the connection is fully established in a way
473 * that works independently from whether we connected to a full bus or just a direct connection. */
474
475 if (!bus->connected_signal)
476 return 0;
477
478 r = sd_bus_message_new_signal(
479 bus,
480 &m,
481 "/org/freedesktop/DBus/Local",
482 "org.freedesktop.DBus.Local",
483 "Connected");
484 if (r < 0)
485 return r;
486
487 bus_message_set_sender_local(bus, m);
488 m->read_counter = ++bus->read_counter;
489
490 r = bus_seal_synthetic_message(bus, m);
491 if (r < 0)
492 return r;
493
494 r = bus_rqueue_make_room(bus);
495 if (r < 0)
496 return r;
497
498 /* Insert at the very front */
499 memmove(bus->rqueue + 1, bus->rqueue, sizeof(sd_bus_message*) * bus->rqueue_size);
500 bus->rqueue[0] = bus_message_ref_queued(m, bus);
501 bus->rqueue_size++;
502
503 return 0;
504 }
505
506 void bus_set_state(sd_bus *bus, enum bus_state state) {
507 static const char * const table[_BUS_STATE_MAX] = {
508 [BUS_UNSET] = "UNSET",
509 [BUS_WATCH_BIND] = "WATCH_BIND",
510 [BUS_OPENING] = "OPENING",
511 [BUS_AUTHENTICATING] = "AUTHENTICATING",
512 [BUS_HELLO] = "HELLO",
513 [BUS_RUNNING] = "RUNNING",
514 [BUS_CLOSING] = "CLOSING",
515 [BUS_CLOSED] = "CLOSED",
516 };
517
518 assert(bus);
519 assert(state < _BUS_STATE_MAX);
520
521 if (state == bus->state)
522 return;
523
524 log_debug("Bus %s: changing state %s → %s", strna(bus->description), table[bus->state], table[state]);
525 bus->state = state;
526 }
527
528 static int hello_callback(sd_bus_message *reply, void *userdata, sd_bus_error *error) {
529 const char *s;
530 sd_bus *bus;
531 int r;
532
533 assert(reply);
534 bus = reply->bus;
535 assert(bus);
536 assert(IN_SET(bus->state, BUS_HELLO, BUS_CLOSING));
537
538 r = sd_bus_message_get_errno(reply);
539 if (r > 0) {
540 r = -r;
541 goto fail;
542 }
543
544 r = sd_bus_message_read(reply, "s", &s);
545 if (r < 0)
546 goto fail;
547
548 if (!service_name_is_valid(s) || s[0] != ':') {
549 r = -EBADMSG;
550 goto fail;
551 }
552
553 r = free_and_strdup(&bus->unique_name, s);
554 if (r < 0)
555 goto fail;
556
557 if (bus->state == BUS_HELLO) {
558 bus_set_state(bus, BUS_RUNNING);
559
560 r = synthesize_connected_signal(bus);
561 if (r < 0)
562 goto fail;
563 }
564
565 return 1;
566
567 fail:
568 /* When Hello() failed, let's propagate this in two ways: first we return the error immediately here,
569 * which is the propagated up towards the event loop. Let's also invalidate the connection, so that
570 * if the user then calls back into us again we won't wait any longer. */
571
572 bus_set_state(bus, BUS_CLOSING);
573 return r;
574 }
575
576 static int bus_send_hello(sd_bus *bus) {
577 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
578 int r;
579
580 assert(bus);
581
582 if (!bus->bus_client)
583 return 0;
584
585 r = sd_bus_message_new_method_call(
586 bus,
587 &m,
588 "org.freedesktop.DBus",
589 "/org/freedesktop/DBus",
590 "org.freedesktop.DBus",
591 "Hello");
592 if (r < 0)
593 return r;
594
595 return sd_bus_call_async(bus, NULL, m, hello_callback, NULL, 0);
596 }
597
598 int bus_start_running(sd_bus *bus) {
599 struct reply_callback *c;
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) {
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)) /* We insist on NUL termination */
751 return -E2BIG;
752
753 b->sockaddr.un = (struct sockaddr_un) {
754 .sun_family = AF_UNIX,
755 };
756
757 memcpy(b->sockaddr.un.sun_path, path, l);
758 b->sockaddr_size = offsetof(struct sockaddr_un, sun_path) + l + 1;
759
760 } else {
761 assert(abstract);
762
763 l = strlen(abstract);
764 if (l >= sizeof(b->sockaddr.un.sun_path) - 1) /* We insist on NUL termination */
765 return -E2BIG;
766
767 b->sockaddr.un = (struct sockaddr_un) {
768 .sun_family = AF_UNIX,
769 };
770
771 memcpy(b->sockaddr.un.sun_path+1, abstract, l);
772 b->sockaddr_size = offsetof(struct sockaddr_un, sun_path) + 1 + l;
773 }
774
775 b->is_local = true;
776
777 return 0;
778 }
779
780 static int parse_tcp_address(sd_bus *b, const char **p, char **guid) {
781 _cleanup_free_ char *host = NULL, *port = NULL, *family = NULL;
782 int r;
783 struct addrinfo *result, hints = {
784 .ai_socktype = SOCK_STREAM,
785 };
786
787 assert(b);
788 assert(p);
789 assert(*p);
790 assert(guid);
791
792 while (!IN_SET(**p, 0, ';')) {
793 r = parse_address_key(p, "guid", guid);
794 if (r < 0)
795 return r;
796 else if (r > 0)
797 continue;
798
799 r = parse_address_key(p, "host", &host);
800 if (r < 0)
801 return r;
802 else if (r > 0)
803 continue;
804
805 r = parse_address_key(p, "port", &port);
806 if (r < 0)
807 return r;
808 else if (r > 0)
809 continue;
810
811 r = parse_address_key(p, "family", &family);
812 if (r < 0)
813 return r;
814 else if (r > 0)
815 continue;
816
817 skip_address_key(p);
818 }
819
820 if (!host || !port)
821 return -EINVAL;
822
823 if (family) {
824 if (streq(family, "ipv4"))
825 hints.ai_family = AF_INET;
826 else if (streq(family, "ipv6"))
827 hints.ai_family = AF_INET6;
828 else
829 return -EINVAL;
830 }
831
832 r = getaddrinfo(host, port, &hints, &result);
833 if (r == EAI_SYSTEM)
834 return -errno;
835 else if (r != 0)
836 return -EADDRNOTAVAIL;
837
838 memcpy(&b->sockaddr, result->ai_addr, result->ai_addrlen);
839 b->sockaddr_size = result->ai_addrlen;
840
841 freeaddrinfo(result);
842
843 b->is_local = false;
844
845 return 0;
846 }
847
848 static int parse_exec_address(sd_bus *b, const char **p, char **guid) {
849 char *path = NULL;
850 unsigned n_argv = 0, j;
851 char **argv = NULL;
852 size_t allocated = 0;
853 int r;
854
855 assert(b);
856 assert(p);
857 assert(*p);
858 assert(guid);
859
860 while (!IN_SET(**p, 0, ';')) {
861 r = parse_address_key(p, "guid", guid);
862 if (r < 0)
863 goto fail;
864 else if (r > 0)
865 continue;
866
867 r = parse_address_key(p, "path", &path);
868 if (r < 0)
869 goto fail;
870 else if (r > 0)
871 continue;
872
873 if (startswith(*p, "argv")) {
874 unsigned ul;
875
876 errno = 0;
877 ul = strtoul(*p + 4, (char**) p, 10);
878 if (errno > 0 || **p != '=' || ul > 256) {
879 r = -EINVAL;
880 goto fail;
881 }
882
883 (*p)++;
884
885 if (ul >= n_argv) {
886 if (!GREEDY_REALLOC0(argv, allocated, ul + 2)) {
887 r = -ENOMEM;
888 goto fail;
889 }
890
891 n_argv = ul + 1;
892 }
893
894 r = parse_address_key(p, NULL, argv + ul);
895 if (r < 0)
896 goto fail;
897
898 continue;
899 }
900
901 skip_address_key(p);
902 }
903
904 if (!path) {
905 r = -EINVAL;
906 goto fail;
907 }
908
909 /* Make sure there are no holes in the array, with the
910 * exception of argv[0] */
911 for (j = 1; j < n_argv; j++)
912 if (!argv[j]) {
913 r = -EINVAL;
914 goto fail;
915 }
916
917 if (argv && argv[0] == NULL) {
918 argv[0] = strdup(path);
919 if (!argv[0]) {
920 r = -ENOMEM;
921 goto fail;
922 }
923 }
924
925 b->exec_path = path;
926 b->exec_argv = argv;
927
928 b->is_local = false;
929
930 return 0;
931
932 fail:
933 for (j = 0; j < n_argv; j++)
934 free(argv[j]);
935
936 free(argv);
937 free(path);
938 return r;
939 }
940
941 static int parse_container_unix_address(sd_bus *b, const char **p, char **guid) {
942 _cleanup_free_ char *machine = NULL, *pid = NULL;
943 int r;
944
945 assert(b);
946 assert(p);
947 assert(*p);
948 assert(guid);
949
950 while (!IN_SET(**p, 0, ';')) {
951 r = parse_address_key(p, "guid", guid);
952 if (r < 0)
953 return r;
954 else if (r > 0)
955 continue;
956
957 r = parse_address_key(p, "machine", &machine);
958 if (r < 0)
959 return r;
960 else if (r > 0)
961 continue;
962
963 r = parse_address_key(p, "pid", &pid);
964 if (r < 0)
965 return r;
966 else if (r > 0)
967 continue;
968
969 skip_address_key(p);
970 }
971
972 if (!machine == !pid)
973 return -EINVAL;
974
975 if (machine) {
976 if (!streq(machine, ".host") && !machine_name_is_valid(machine))
977 return -EINVAL;
978
979 free_and_replace(b->machine, machine);
980 } else
981 b->machine = mfree(b->machine);
982
983 if (pid) {
984 r = parse_pid(pid, &b->nspid);
985 if (r < 0)
986 return r;
987 } else
988 b->nspid = 0;
989
990 b->sockaddr.un = (struct sockaddr_un) {
991 .sun_family = AF_UNIX,
992 /* Note that we use the old /var/run prefix here, to increase compatibility with really old containers */
993 .sun_path = "/var/run/dbus/system_bus_socket",
994 };
995 b->sockaddr_size = SOCKADDR_UN_LEN(b->sockaddr.un);
996 b->is_local = false;
997
998 return 0;
999 }
1000
1001 static void bus_reset_parsed_address(sd_bus *b) {
1002 assert(b);
1003
1004 zero(b->sockaddr);
1005 b->sockaddr_size = 0;
1006 b->exec_argv = strv_free(b->exec_argv);
1007 b->exec_path = mfree(b->exec_path);
1008 b->server_id = SD_ID128_NULL;
1009 b->machine = mfree(b->machine);
1010 b->nspid = 0;
1011 }
1012
1013 static int bus_parse_next_address(sd_bus *b) {
1014 _cleanup_free_ char *guid = NULL;
1015 const char *a;
1016 int r;
1017
1018 assert(b);
1019
1020 if (!b->address)
1021 return 0;
1022 if (b->address[b->address_index] == 0)
1023 return 0;
1024
1025 bus_reset_parsed_address(b);
1026
1027 a = b->address + b->address_index;
1028
1029 while (*a != 0) {
1030
1031 if (*a == ';') {
1032 a++;
1033 continue;
1034 }
1035
1036 if (startswith(a, "unix:")) {
1037 a += 5;
1038
1039 r = parse_unix_address(b, &a, &guid);
1040 if (r < 0)
1041 return r;
1042 break;
1043
1044 } else if (startswith(a, "tcp:")) {
1045
1046 a += 4;
1047 r = parse_tcp_address(b, &a, &guid);
1048 if (r < 0)
1049 return r;
1050
1051 break;
1052
1053 } else if (startswith(a, "unixexec:")) {
1054
1055 a += 9;
1056 r = parse_exec_address(b, &a, &guid);
1057 if (r < 0)
1058 return r;
1059
1060 break;
1061
1062 } else if (startswith(a, "x-machine-unix:")) {
1063
1064 a += 15;
1065 r = parse_container_unix_address(b, &a, &guid);
1066 if (r < 0)
1067 return r;
1068
1069 break;
1070 }
1071
1072 a = strchr(a, ';');
1073 if (!a)
1074 return 0;
1075 }
1076
1077 if (guid) {
1078 r = sd_id128_from_string(guid, &b->server_id);
1079 if (r < 0)
1080 return r;
1081 }
1082
1083 b->address_index = a - b->address;
1084 return 1;
1085 }
1086
1087 static void bus_kill_exec(sd_bus *bus) {
1088 if (pid_is_valid(bus->busexec_pid) > 0) {
1089 sigterm_wait(bus->busexec_pid);
1090 bus->busexec_pid = 0;
1091 }
1092 }
1093
1094 static int bus_start_address(sd_bus *b) {
1095 int r;
1096
1097 assert(b);
1098
1099 for (;;) {
1100 bus_close_io_fds(b);
1101 bus_close_inotify_fd(b);
1102
1103 bus_kill_exec(b);
1104
1105 /* If you provide multiple different bus-addresses, we
1106 * try all of them in order and use the first one that
1107 * succeeds. */
1108
1109 if (b->exec_path)
1110 r = bus_socket_exec(b);
1111 else if ((b->nspid > 0 || b->machine) && b->sockaddr.sa.sa_family != AF_UNSPEC)
1112 r = bus_container_connect_socket(b);
1113 else if (b->sockaddr.sa.sa_family != AF_UNSPEC)
1114 r = bus_socket_connect(b);
1115 else
1116 goto next;
1117
1118 if (r >= 0) {
1119 int q;
1120
1121 q = bus_attach_io_events(b);
1122 if (q < 0)
1123 return q;
1124
1125 q = bus_attach_inotify_event(b);
1126 if (q < 0)
1127 return q;
1128
1129 return r;
1130 }
1131
1132 b->last_connect_error = -r;
1133
1134 next:
1135 r = bus_parse_next_address(b);
1136 if (r < 0)
1137 return r;
1138 if (r == 0)
1139 return b->last_connect_error > 0 ? -b->last_connect_error : -ECONNREFUSED;
1140 }
1141 }
1142
1143 int bus_next_address(sd_bus *b) {
1144 assert(b);
1145
1146 bus_reset_parsed_address(b);
1147 return bus_start_address(b);
1148 }
1149
1150 static int bus_start_fd(sd_bus *b) {
1151 struct stat st;
1152 int r;
1153
1154 assert(b);
1155 assert(b->input_fd >= 0);
1156 assert(b->output_fd >= 0);
1157
1158 if (DEBUG_LOGGING) {
1159 _cleanup_free_ char *pi = NULL, *po = NULL;
1160 (void) fd_get_path(b->input_fd, &pi);
1161 (void) fd_get_path(b->output_fd, &po);
1162 log_debug("sd-bus: starting bus%s%s on fds %d/%d (%s, %s)...",
1163 b->description ? " " : "", strempty(b->description),
1164 b->input_fd, b->output_fd,
1165 pi ?: "???", po ?: "???");
1166 }
1167
1168 r = fd_nonblock(b->input_fd, true);
1169 if (r < 0)
1170 return r;
1171
1172 r = fd_cloexec(b->input_fd, true);
1173 if (r < 0)
1174 return r;
1175
1176 if (b->input_fd != b->output_fd) {
1177 r = fd_nonblock(b->output_fd, true);
1178 if (r < 0)
1179 return r;
1180
1181 r = fd_cloexec(b->output_fd, true);
1182 if (r < 0)
1183 return r;
1184 }
1185
1186 if (fstat(b->input_fd, &st) < 0)
1187 return -errno;
1188
1189 return bus_socket_take_fd(b);
1190 }
1191
1192 _public_ int sd_bus_start(sd_bus *bus) {
1193 int r;
1194
1195 assert_return(bus, -EINVAL);
1196 assert_return(bus = bus_resolve(bus), -ENOPKG);
1197 assert_return(bus->state == BUS_UNSET, -EPERM);
1198 assert_return(!bus_pid_changed(bus), -ECHILD);
1199
1200 bus_set_state(bus, BUS_OPENING);
1201
1202 if (bus->is_server && bus->bus_client)
1203 return -EINVAL;
1204
1205 if (bus->input_fd >= 0)
1206 r = bus_start_fd(bus);
1207 else if (bus->address || bus->sockaddr.sa.sa_family != AF_UNSPEC || bus->exec_path || bus->machine)
1208 r = bus_start_address(bus);
1209 else
1210 return -EINVAL;
1211
1212 if (r < 0) {
1213 sd_bus_close(bus);
1214 return r;
1215 }
1216
1217 return bus_send_hello(bus);
1218 }
1219
1220 _public_ int sd_bus_open_with_description(sd_bus **ret, const char *description) {
1221 const char *e;
1222 _cleanup_(bus_freep) sd_bus *b = NULL;
1223 int r;
1224
1225 assert_return(ret, -EINVAL);
1226
1227 /* Let's connect to the starter bus if it is set, and
1228 * otherwise to the bus that is appropriate for the scope
1229 * we are running in */
1230
1231 e = secure_getenv("DBUS_STARTER_BUS_TYPE");
1232 if (e) {
1233 if (streq(e, "system"))
1234 return sd_bus_open_system_with_description(ret, description);
1235 else if (STR_IN_SET(e, "session", "user"))
1236 return sd_bus_open_user_with_description(ret, description);
1237 }
1238
1239 e = secure_getenv("DBUS_STARTER_ADDRESS");
1240 if (!e) {
1241 if (cg_pid_get_owner_uid(0, NULL) >= 0)
1242 return sd_bus_open_user_with_description(ret, description);
1243 else
1244 return sd_bus_open_system_with_description(ret, description);
1245 }
1246
1247 r = sd_bus_new(&b);
1248 if (r < 0)
1249 return r;
1250
1251 r = sd_bus_set_address(b, e);
1252 if (r < 0)
1253 return r;
1254
1255 b->bus_client = true;
1256
1257 /* We don't know whether the bus is trusted or not, so better
1258 * be safe, and authenticate everything */
1259 b->trusted = false;
1260 b->is_local = false;
1261 b->creds_mask |= SD_BUS_CREDS_UID | SD_BUS_CREDS_EUID | SD_BUS_CREDS_EFFECTIVE_CAPS;
1262
1263 r = sd_bus_start(b);
1264 if (r < 0)
1265 return r;
1266
1267 *ret = TAKE_PTR(b);
1268 return 0;
1269 }
1270
1271 _public_ int sd_bus_open(sd_bus **ret) {
1272 return sd_bus_open_with_description(ret, NULL);
1273 }
1274
1275 int bus_set_address_system(sd_bus *b) {
1276 const char *e;
1277 int r;
1278
1279 assert(b);
1280
1281 e = secure_getenv("DBUS_SYSTEM_BUS_ADDRESS");
1282
1283 r = sd_bus_set_address(b, e ?: DEFAULT_SYSTEM_BUS_ADDRESS);
1284 if (r >= 0)
1285 b->is_system = true;
1286 return r;
1287 }
1288
1289 _public_ int sd_bus_open_system_with_description(sd_bus **ret, const char *description) {
1290 _cleanup_(bus_freep) sd_bus *b = NULL;
1291 int r;
1292
1293 assert_return(ret, -EINVAL);
1294
1295 r = sd_bus_new(&b);
1296 if (r < 0)
1297 return r;
1298
1299 if (description) {
1300 r = sd_bus_set_description(b, description);
1301 if (r < 0)
1302 return r;
1303 }
1304
1305 r = bus_set_address_system(b);
1306 if (r < 0)
1307 return r;
1308
1309 b->bus_client = true;
1310
1311 /* Let's do per-method access control on the system bus. We
1312 * need the caller's UID and capability set for that. */
1313 b->trusted = false;
1314 b->creds_mask |= SD_BUS_CREDS_UID | SD_BUS_CREDS_EUID | SD_BUS_CREDS_EFFECTIVE_CAPS;
1315 b->is_local = true;
1316
1317 r = sd_bus_start(b);
1318 if (r < 0)
1319 return r;
1320
1321 *ret = TAKE_PTR(b);
1322 return 0;
1323 }
1324
1325 _public_ int sd_bus_open_system(sd_bus **ret) {
1326 return sd_bus_open_system_with_description(ret, NULL);
1327 }
1328
1329 int bus_set_address_user(sd_bus *b) {
1330 const char *a;
1331 _cleanup_free_ char *_a = NULL;
1332 int r;
1333
1334 assert(b);
1335
1336 a = secure_getenv("DBUS_SESSION_BUS_ADDRESS");
1337 if (!a) {
1338 const char *e;
1339 _cleanup_free_ char *ee = NULL;
1340
1341 e = secure_getenv("XDG_RUNTIME_DIR");
1342 if (!e)
1343 return -ENOENT;
1344
1345 ee = bus_address_escape(e);
1346 if (!ee)
1347 return -ENOMEM;
1348
1349 if (asprintf(&_a, DEFAULT_USER_BUS_ADDRESS_FMT, ee) < 0)
1350 return -ENOMEM;
1351 a = _a;
1352 }
1353
1354 r = sd_bus_set_address(b, a);
1355 if (r >= 0)
1356 b->is_user = true;
1357 return r;
1358 }
1359
1360 _public_ int sd_bus_open_user_with_description(sd_bus **ret, const char *description) {
1361 _cleanup_(bus_freep) sd_bus *b = NULL;
1362 int r;
1363
1364 assert_return(ret, -EINVAL);
1365
1366 r = sd_bus_new(&b);
1367 if (r < 0)
1368 return r;
1369
1370 if (description) {
1371 r = sd_bus_set_description(b, description);
1372 if (r < 0)
1373 return r;
1374 }
1375
1376 r = bus_set_address_user(b);
1377 if (r < 0)
1378 return r;
1379
1380 b->bus_client = true;
1381
1382 /* We don't do any per-method access control on the user bus. */
1383 b->trusted = true;
1384 b->is_local = true;
1385
1386 r = sd_bus_start(b);
1387 if (r < 0)
1388 return r;
1389
1390 *ret = TAKE_PTR(b);
1391 return 0;
1392 }
1393
1394 _public_ int sd_bus_open_user(sd_bus **ret) {
1395 return sd_bus_open_user_with_description(ret, NULL);
1396 }
1397
1398 int bus_set_address_system_remote(sd_bus *b, const char *host) {
1399 _cleanup_free_ char *e = NULL;
1400 char *m = NULL, *c = NULL, *a, *rbracket = NULL, *p = NULL;
1401
1402 assert(b);
1403 assert(host);
1404
1405 /* Skip ":"s in ipv6 addresses */
1406 if (*host == '[') {
1407 char *t;
1408
1409 rbracket = strchr(host, ']');
1410 if (!rbracket)
1411 return -EINVAL;
1412 t = strndupa(host + 1, rbracket - host - 1);
1413 e = bus_address_escape(t);
1414 if (!e)
1415 return -ENOMEM;
1416 } else if ((a = strchr(host, '@'))) {
1417 if (*(a + 1) == '[') {
1418 _cleanup_free_ char *t = NULL;
1419
1420 rbracket = strchr(a + 1, ']');
1421 if (!rbracket)
1422 return -EINVAL;
1423 t = new0(char, strlen(host));
1424 if (!t)
1425 return -ENOMEM;
1426 strncat(t, host, a - host + 1);
1427 strncat(t, a + 2, rbracket - a - 2);
1428 e = bus_address_escape(t);
1429 if (!e)
1430 return -ENOMEM;
1431 } else if (*(a + 1) == '\0' || strchr(a + 1, '@'))
1432 return -EINVAL;
1433 }
1434
1435 /* Let's see if a port was given */
1436 m = strchr(rbracket ? rbracket + 1 : host, ':');
1437 if (m) {
1438 char *t;
1439 bool got_forward_slash = false;
1440
1441 p = m + 1;
1442
1443 t = strchr(p, '/');
1444 if (t) {
1445 p = strndupa(p, t - p);
1446 got_forward_slash = true;
1447 }
1448
1449 if (!in_charset(p, "0123456789") || *p == '\0') {
1450 if (!machine_name_is_valid(p) || got_forward_slash)
1451 return -EINVAL;
1452
1453 m = TAKE_PTR(p);
1454 goto interpret_port_as_machine_old_syntax;
1455 }
1456 }
1457
1458 /* Let's see if a machine was given */
1459 m = strchr(rbracket ? rbracket + 1 : host, '/');
1460 if (m) {
1461 m++;
1462 interpret_port_as_machine_old_syntax:
1463 /* Let's make sure this is not a port of some kind,
1464 * and is a valid machine name. */
1465 if (!in_charset(m, "0123456789") && machine_name_is_valid(m))
1466 c = strjoina(",argv", p ? "7" : "5", "=--machine=", m);
1467 }
1468
1469 if (!e) {
1470 char *t;
1471
1472 t = strndupa(host, strcspn(host, ":/"));
1473
1474 e = bus_address_escape(t);
1475 if (!e)
1476 return -ENOMEM;
1477 }
1478
1479 a = strjoin("unixexec:path=ssh,argv1=-xT", p ? ",argv2=-p,argv3=" : "", strempty(p),
1480 ",argv", p ? "4" : "2", "=--,argv", p ? "5" : "3", "=", e,
1481 ",argv", p ? "6" : "4", "=systemd-stdio-bridge", c);
1482 if (!a)
1483 return -ENOMEM;
1484
1485 return free_and_replace(b->address, a);
1486 }
1487
1488 _public_ int sd_bus_open_system_remote(sd_bus **ret, const char *host) {
1489 _cleanup_(bus_freep) sd_bus *b = NULL;
1490 int r;
1491
1492 assert_return(host, -EINVAL);
1493 assert_return(ret, -EINVAL);
1494
1495 r = sd_bus_new(&b);
1496 if (r < 0)
1497 return r;
1498
1499 r = bus_set_address_system_remote(b, host);
1500 if (r < 0)
1501 return r;
1502
1503 b->bus_client = true;
1504 b->trusted = false;
1505 b->is_system = true;
1506 b->is_local = false;
1507
1508 r = sd_bus_start(b);
1509 if (r < 0)
1510 return r;
1511
1512 *ret = TAKE_PTR(b);
1513 return 0;
1514 }
1515
1516 int bus_set_address_system_machine(sd_bus *b, const char *machine) {
1517 _cleanup_free_ char *e = NULL;
1518 char *a;
1519
1520 assert(b);
1521 assert(machine);
1522
1523 e = bus_address_escape(machine);
1524 if (!e)
1525 return -ENOMEM;
1526
1527 a = strjoin("x-machine-unix:machine=", e);
1528 if (!a)
1529 return -ENOMEM;
1530
1531 return free_and_replace(b->address, a);
1532 }
1533
1534 _public_ int sd_bus_open_system_machine(sd_bus **ret, const char *machine) {
1535 _cleanup_(bus_freep) sd_bus *b = NULL;
1536 int r;
1537
1538 assert_return(machine, -EINVAL);
1539 assert_return(ret, -EINVAL);
1540 assert_return(streq(machine, ".host") || machine_name_is_valid(machine), -EINVAL);
1541
1542 r = sd_bus_new(&b);
1543 if (r < 0)
1544 return r;
1545
1546 r = bus_set_address_system_machine(b, machine);
1547 if (r < 0)
1548 return r;
1549
1550 b->bus_client = true;
1551 b->trusted = false;
1552 b->is_system = true;
1553 b->is_local = false;
1554
1555 r = sd_bus_start(b);
1556 if (r < 0)
1557 return r;
1558
1559 *ret = TAKE_PTR(b);
1560 return 0;
1561 }
1562
1563 _public_ void sd_bus_close(sd_bus *bus) {
1564 if (!bus)
1565 return;
1566 if (bus->state == BUS_CLOSED)
1567 return;
1568 if (bus_pid_changed(bus))
1569 return;
1570
1571 /* Don't leave ssh hanging around */
1572 bus_kill_exec(bus);
1573
1574 bus_set_state(bus, BUS_CLOSED);
1575
1576 sd_bus_detach_event(bus);
1577
1578 /* Drop all queued messages so that they drop references to
1579 * the bus object and the bus may be freed */
1580 bus_reset_queues(bus);
1581
1582 bus_close_io_fds(bus);
1583 bus_close_inotify_fd(bus);
1584 }
1585
1586 _public_ sd_bus *sd_bus_close_unref(sd_bus *bus) {
1587 if (!bus)
1588 return NULL;
1589
1590 sd_bus_close(bus);
1591
1592 return sd_bus_unref(bus);
1593 }
1594
1595 _public_ sd_bus* sd_bus_flush_close_unref(sd_bus *bus) {
1596 if (!bus)
1597 return NULL;
1598
1599 /* Have to do this before flush() to prevent hang */
1600 bus_kill_exec(bus);
1601 sd_bus_flush(bus);
1602
1603 return sd_bus_close_unref(bus);
1604 }
1605
1606 void bus_enter_closing(sd_bus *bus) {
1607 assert(bus);
1608
1609 if (!IN_SET(bus->state, BUS_WATCH_BIND, BUS_OPENING, BUS_AUTHENTICATING, BUS_HELLO, BUS_RUNNING))
1610 return;
1611
1612 bus_set_state(bus, BUS_CLOSING);
1613 }
1614
1615 DEFINE_PUBLIC_TRIVIAL_REF_UNREF_FUNC(sd_bus, sd_bus, bus_free);
1616
1617 _public_ int sd_bus_is_open(sd_bus *bus) {
1618 assert_return(bus, -EINVAL);
1619 assert_return(bus = bus_resolve(bus), -ENOPKG);
1620 assert_return(!bus_pid_changed(bus), -ECHILD);
1621
1622 return BUS_IS_OPEN(bus->state);
1623 }
1624
1625 _public_ int sd_bus_is_ready(sd_bus *bus) {
1626 assert_return(bus, -EINVAL);
1627 assert_return(bus = bus_resolve(bus), -ENOPKG);
1628 assert_return(!bus_pid_changed(bus), -ECHILD);
1629
1630 return bus->state == BUS_RUNNING;
1631 }
1632
1633 _public_ int sd_bus_can_send(sd_bus *bus, char type) {
1634 int r;
1635
1636 assert_return(bus, -EINVAL);
1637 assert_return(bus = bus_resolve(bus), -ENOPKG);
1638 assert_return(bus->state != BUS_UNSET, -ENOTCONN);
1639 assert_return(!bus_pid_changed(bus), -ECHILD);
1640
1641 if (bus->is_monitor)
1642 return 0;
1643
1644 if (type == SD_BUS_TYPE_UNIX_FD) {
1645 if (!bus->accept_fd)
1646 return 0;
1647
1648 r = bus_ensure_running(bus);
1649 if (r < 0)
1650 return r;
1651
1652 return bus->can_fds;
1653 }
1654
1655 return bus_type_is_valid(type);
1656 }
1657
1658 _public_ int sd_bus_get_bus_id(sd_bus *bus, sd_id128_t *id) {
1659 int r;
1660
1661 assert_return(bus, -EINVAL);
1662 assert_return(bus = bus_resolve(bus), -ENOPKG);
1663 assert_return(id, -EINVAL);
1664 assert_return(!bus_pid_changed(bus), -ECHILD);
1665
1666 r = bus_ensure_running(bus);
1667 if (r < 0)
1668 return r;
1669
1670 *id = bus->server_id;
1671 return 0;
1672 }
1673
1674 #define COOKIE_CYCLED (UINT32_C(1) << 31)
1675
1676 static uint64_t cookie_inc(uint64_t cookie) {
1677
1678 /* Stay within the 32bit range, since classic D-Bus can't deal with more */
1679 if (cookie >= UINT32_MAX)
1680 return COOKIE_CYCLED; /* Don't go back to zero, but use the highest bit for checking
1681 * whether we are looping. */
1682
1683 return cookie + 1;
1684 }
1685
1686 static int next_cookie(sd_bus *b) {
1687 uint64_t new_cookie;
1688
1689 assert(b);
1690
1691 new_cookie = cookie_inc(b->cookie);
1692
1693 /* Small optimization: don't bother with checking for cookie reuse until we overran cookiespace at
1694 * least once, but then do it thorougly. */
1695 if (FLAGS_SET(new_cookie, COOKIE_CYCLED)) {
1696 uint32_t i;
1697
1698 /* Check if the cookie is currently in use. If so, pick the next one */
1699 for (i = 0; i < COOKIE_CYCLED; i++) {
1700 if (!ordered_hashmap_contains(b->reply_callbacks, &new_cookie))
1701 goto good;
1702
1703 new_cookie = cookie_inc(new_cookie);
1704 }
1705
1706 /* Can't fulfill request */
1707 return -EBUSY;
1708 }
1709
1710 good:
1711 b->cookie = new_cookie;
1712 return 0;
1713 }
1714
1715 static int bus_seal_message(sd_bus *b, sd_bus_message *m, usec_t timeout) {
1716 int r;
1717
1718 assert(b);
1719 assert(m);
1720
1721 if (m->sealed) {
1722 /* If we copy the same message to multiple
1723 * destinations, avoid using the same cookie
1724 * numbers. */
1725 b->cookie = MAX(b->cookie, BUS_MESSAGE_COOKIE(m));
1726 return 0;
1727 }
1728
1729 if (timeout == 0) {
1730 r = sd_bus_get_method_call_timeout(b, &timeout);
1731 if (r < 0)
1732 return r;
1733 }
1734
1735 if (!m->sender && b->patch_sender) {
1736 r = sd_bus_message_set_sender(m, b->patch_sender);
1737 if (r < 0)
1738 return r;
1739 }
1740
1741 r = next_cookie(b);
1742 if (r < 0)
1743 return r;
1744
1745 return sd_bus_message_seal(m, b->cookie, timeout);
1746 }
1747
1748 static int bus_remarshal_message(sd_bus *b, sd_bus_message **m) {
1749 bool remarshal = false;
1750
1751 assert(b);
1752
1753 /* wrong packet version */
1754 if (b->message_version != 0 && b->message_version != (*m)->header->version)
1755 remarshal = true;
1756
1757 /* wrong packet endianness */
1758 if (b->message_endian != 0 && b->message_endian != (*m)->header->endian)
1759 remarshal = true;
1760
1761 return remarshal ? bus_message_remarshal(b, m) : 0;
1762 }
1763
1764 int bus_seal_synthetic_message(sd_bus *b, sd_bus_message *m) {
1765 assert(b);
1766 assert(m);
1767
1768 /* Fake some timestamps, if they were requested, and not
1769 * already initialized */
1770 if (b->attach_timestamp) {
1771 if (m->realtime <= 0)
1772 m->realtime = now(CLOCK_REALTIME);
1773
1774 if (m->monotonic <= 0)
1775 m->monotonic = now(CLOCK_MONOTONIC);
1776 }
1777
1778 /* The bus specification says the serial number cannot be 0,
1779 * hence let's fill something in for synthetic messages. Since
1780 * synthetic messages might have a fake sender and we don't
1781 * want to interfere with the real sender's serial numbers we
1782 * pick a fixed, artificial one. We use (uint32_t) -1 rather
1783 * than (uint64_t) -1 since dbus1 only had 32bit identifiers,
1784 * even though kdbus can do 64bit. */
1785 return sd_bus_message_seal(m, 0xFFFFFFFFULL, 0);
1786 }
1787
1788 static int bus_write_message(sd_bus *bus, sd_bus_message *m, size_t *idx) {
1789 int r;
1790
1791 assert(bus);
1792 assert(m);
1793
1794 r = bus_socket_write_message(bus, m, idx);
1795 if (r <= 0)
1796 return r;
1797
1798 if (*idx >= BUS_MESSAGE_SIZE(m))
1799 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",
1800 bus_message_type_to_string(m->header->type),
1801 strna(sd_bus_message_get_sender(m)),
1802 strna(sd_bus_message_get_destination(m)),
1803 strna(sd_bus_message_get_path(m)),
1804 strna(sd_bus_message_get_interface(m)),
1805 strna(sd_bus_message_get_member(m)),
1806 BUS_MESSAGE_COOKIE(m),
1807 m->reply_cookie,
1808 strna(m->root_container.signature),
1809 strna(m->error.name),
1810 strna(m->error.message));
1811
1812 return r;
1813 }
1814
1815 static int dispatch_wqueue(sd_bus *bus) {
1816 int r, ret = 0;
1817
1818 assert(bus);
1819 assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO));
1820
1821 while (bus->wqueue_size > 0) {
1822
1823 r = bus_write_message(bus, bus->wqueue[0], &bus->windex);
1824 if (r < 0)
1825 return r;
1826 else if (r == 0)
1827 /* Didn't do anything this time */
1828 return ret;
1829 else if (bus->windex >= BUS_MESSAGE_SIZE(bus->wqueue[0])) {
1830 /* Fully written. Let's drop the entry from
1831 * the queue.
1832 *
1833 * This isn't particularly optimized, but
1834 * well, this is supposed to be our worst-case
1835 * buffer only, and the socket buffer is
1836 * supposed to be our primary buffer, and if
1837 * it got full, then all bets are off
1838 * anyway. */
1839
1840 bus->wqueue_size--;
1841 bus_message_unref_queued(bus->wqueue[0], bus);
1842 memmove(bus->wqueue, bus->wqueue + 1, sizeof(sd_bus_message*) * bus->wqueue_size);
1843 bus->windex = 0;
1844
1845 ret = 1;
1846 }
1847 }
1848
1849 return ret;
1850 }
1851
1852 static int bus_read_message(sd_bus *bus) {
1853 assert(bus);
1854
1855 return bus_socket_read_message(bus);
1856 }
1857
1858 int bus_rqueue_make_room(sd_bus *bus) {
1859 assert(bus);
1860
1861 if (bus->rqueue_size >= BUS_RQUEUE_MAX)
1862 return -ENOBUFS;
1863
1864 if (!GREEDY_REALLOC(bus->rqueue, bus->rqueue_allocated, bus->rqueue_size + 1))
1865 return -ENOMEM;
1866
1867 return 0;
1868 }
1869
1870 static void rqueue_drop_one(sd_bus *bus, size_t i) {
1871 assert(bus);
1872 assert(i < bus->rqueue_size);
1873
1874 bus_message_unref_queued(bus->rqueue[i], bus);
1875 memmove(bus->rqueue + i, bus->rqueue + i + 1, sizeof(sd_bus_message*) * (bus->rqueue_size - i - 1));
1876 bus->rqueue_size--;
1877 }
1878
1879 static int dispatch_rqueue(sd_bus *bus, sd_bus_message **m) {
1880 int r, ret = 0;
1881
1882 assert(bus);
1883 assert(m);
1884 assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO));
1885
1886 for (;;) {
1887 if (bus->rqueue_size > 0) {
1888 /* Dispatch a queued message */
1889 *m = sd_bus_message_ref(bus->rqueue[0]);
1890 rqueue_drop_one(bus, 0);
1891 return 1;
1892 }
1893
1894 /* Try to read a new message */
1895 r = bus_read_message(bus);
1896 if (r < 0)
1897 return r;
1898 if (r == 0) {
1899 *m = NULL;
1900 return ret;
1901 }
1902
1903 ret = 1;
1904 }
1905 }
1906
1907 _public_ int sd_bus_send(sd_bus *bus, sd_bus_message *_m, uint64_t *cookie) {
1908 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = sd_bus_message_ref(_m);
1909 int r;
1910
1911 assert_return(m, -EINVAL);
1912
1913 if (bus)
1914 assert_return(bus = bus_resolve(bus), -ENOPKG);
1915 else
1916 assert_return(bus = m->bus, -ENOTCONN);
1917 assert_return(!bus_pid_changed(bus), -ECHILD);
1918
1919 if (!BUS_IS_OPEN(bus->state))
1920 return -ENOTCONN;
1921
1922 if (m->n_fds > 0) {
1923 r = sd_bus_can_send(bus, SD_BUS_TYPE_UNIX_FD);
1924 if (r < 0)
1925 return r;
1926 if (r == 0)
1927 return -EOPNOTSUPP;
1928 }
1929
1930 /* If the cookie number isn't kept, then we know that no reply
1931 * is expected */
1932 if (!cookie && !m->sealed)
1933 m->header->flags |= BUS_MESSAGE_NO_REPLY_EXPECTED;
1934
1935 r = bus_seal_message(bus, m, 0);
1936 if (r < 0)
1937 return r;
1938
1939 /* Remarshall if we have to. This will possibly unref the
1940 * message and place a replacement in m */
1941 r = bus_remarshal_message(bus, &m);
1942 if (r < 0)
1943 return r;
1944
1945 /* If this is a reply and no reply was requested, then let's
1946 * suppress this, if we can */
1947 if (m->dont_send)
1948 goto finish;
1949
1950 if (IN_SET(bus->state, BUS_RUNNING, BUS_HELLO) && bus->wqueue_size <= 0) {
1951 size_t idx = 0;
1952
1953 r = bus_write_message(bus, m, &idx);
1954 if (r < 0) {
1955 if (ERRNO_IS_DISCONNECT(r)) {
1956 bus_enter_closing(bus);
1957 return -ECONNRESET;
1958 }
1959
1960 return r;
1961 }
1962
1963 if (idx < BUS_MESSAGE_SIZE(m)) {
1964 /* Wasn't fully written. So let's remember how
1965 * much was written. Note that the first entry
1966 * of the wqueue array is always allocated so
1967 * that we always can remember how much was
1968 * written. */
1969 bus->wqueue[0] = bus_message_ref_queued(m, bus);
1970 bus->wqueue_size = 1;
1971 bus->windex = idx;
1972 }
1973
1974 } else {
1975 /* Just append it to the queue. */
1976
1977 if (bus->wqueue_size >= BUS_WQUEUE_MAX)
1978 return -ENOBUFS;
1979
1980 if (!GREEDY_REALLOC(bus->wqueue, bus->wqueue_allocated, bus->wqueue_size + 1))
1981 return -ENOMEM;
1982
1983 bus->wqueue[bus->wqueue_size++] = bus_message_ref_queued(m, bus);
1984 }
1985
1986 finish:
1987 if (cookie)
1988 *cookie = BUS_MESSAGE_COOKIE(m);
1989
1990 return 1;
1991 }
1992
1993 _public_ int sd_bus_send_to(sd_bus *bus, sd_bus_message *m, const char *destination, uint64_t *cookie) {
1994 int r;
1995
1996 assert_return(m, -EINVAL);
1997
1998 if (bus)
1999 assert_return(bus = bus_resolve(bus), -ENOPKG);
2000 else
2001 assert_return(bus = m->bus, -ENOTCONN);
2002 assert_return(!bus_pid_changed(bus), -ECHILD);
2003
2004 if (!BUS_IS_OPEN(bus->state))
2005 return -ENOTCONN;
2006
2007 if (!streq_ptr(m->destination, destination)) {
2008
2009 if (!destination)
2010 return -EEXIST;
2011
2012 r = sd_bus_message_set_destination(m, destination);
2013 if (r < 0)
2014 return r;
2015 }
2016
2017 return sd_bus_send(bus, m, cookie);
2018 }
2019
2020 static usec_t calc_elapse(sd_bus *bus, uint64_t usec) {
2021 assert(bus);
2022
2023 if (usec == (uint64_t) -1)
2024 return 0;
2025
2026 /* We start all timeouts the instant we enter BUS_HELLO/BUS_RUNNING state, so that the don't run in parallel
2027 * with any connection setup states. Hence, if a method callback is started earlier than that we just store the
2028 * relative timestamp, and afterwards the absolute one. */
2029
2030 if (IN_SET(bus->state, BUS_WATCH_BIND, BUS_OPENING, BUS_AUTHENTICATING))
2031 return usec;
2032 else
2033 return now(CLOCK_MONOTONIC) + usec;
2034 }
2035
2036 static int timeout_compare(const void *a, const void *b) {
2037 const struct reply_callback *x = a, *y = b;
2038
2039 if (x->timeout_usec != 0 && y->timeout_usec == 0)
2040 return -1;
2041
2042 if (x->timeout_usec == 0 && y->timeout_usec != 0)
2043 return 1;
2044
2045 return CMP(x->timeout_usec, y->timeout_usec);
2046 }
2047
2048 _public_ int sd_bus_call_async(
2049 sd_bus *bus,
2050 sd_bus_slot **slot,
2051 sd_bus_message *_m,
2052 sd_bus_message_handler_t callback,
2053 void *userdata,
2054 uint64_t usec) {
2055
2056 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = sd_bus_message_ref(_m);
2057 _cleanup_(sd_bus_slot_unrefp) sd_bus_slot *s = NULL;
2058 int r;
2059
2060 assert_return(m, -EINVAL);
2061 assert_return(m->header->type == SD_BUS_MESSAGE_METHOD_CALL, -EINVAL);
2062 assert_return(!m->sealed || (!!callback == !(m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED)), -EINVAL);
2063
2064 if (bus)
2065 assert_return(bus = bus_resolve(bus), -ENOPKG);
2066 else
2067 assert_return(bus = m->bus, -ENOTCONN);
2068 assert_return(!bus_pid_changed(bus), -ECHILD);
2069
2070 if (!BUS_IS_OPEN(bus->state))
2071 return -ENOTCONN;
2072
2073 /* If no callback is specified and there's no interest in a slot, then there's no reason to ask for a reply */
2074 if (!callback && !slot && !m->sealed)
2075 m->header->flags |= BUS_MESSAGE_NO_REPLY_EXPECTED;
2076
2077 r = ordered_hashmap_ensure_allocated(&bus->reply_callbacks, &uint64_hash_ops);
2078 if (r < 0)
2079 return r;
2080
2081 r = prioq_ensure_allocated(&bus->reply_callbacks_prioq, timeout_compare);
2082 if (r < 0)
2083 return r;
2084
2085 r = bus_seal_message(bus, m, usec);
2086 if (r < 0)
2087 return r;
2088
2089 r = bus_remarshal_message(bus, &m);
2090 if (r < 0)
2091 return r;
2092
2093 if (slot || callback) {
2094 s = bus_slot_allocate(bus, !slot, BUS_REPLY_CALLBACK, sizeof(struct reply_callback), userdata);
2095 if (!s)
2096 return -ENOMEM;
2097
2098 s->reply_callback.callback = callback;
2099
2100 s->reply_callback.cookie = BUS_MESSAGE_COOKIE(m);
2101 r = ordered_hashmap_put(bus->reply_callbacks, &s->reply_callback.cookie, &s->reply_callback);
2102 if (r < 0) {
2103 s->reply_callback.cookie = 0;
2104 return r;
2105 }
2106
2107 s->reply_callback.timeout_usec = calc_elapse(bus, m->timeout);
2108 if (s->reply_callback.timeout_usec != 0) {
2109 r = prioq_put(bus->reply_callbacks_prioq, &s->reply_callback, &s->reply_callback.prioq_idx);
2110 if (r < 0) {
2111 s->reply_callback.timeout_usec = 0;
2112 return r;
2113 }
2114 }
2115 }
2116
2117 r = sd_bus_send(bus, m, s ? &s->reply_callback.cookie : NULL);
2118 if (r < 0)
2119 return r;
2120
2121 if (slot)
2122 *slot = s;
2123 s = NULL;
2124
2125 return r;
2126 }
2127
2128 int bus_ensure_running(sd_bus *bus) {
2129 int r;
2130
2131 assert(bus);
2132
2133 if (IN_SET(bus->state, BUS_UNSET, BUS_CLOSED, BUS_CLOSING))
2134 return -ENOTCONN;
2135 if (bus->state == BUS_RUNNING)
2136 return 1;
2137
2138 for (;;) {
2139 r = sd_bus_process(bus, NULL);
2140 if (r < 0)
2141 return r;
2142 if (bus->state == BUS_RUNNING)
2143 return 1;
2144 if (r > 0)
2145 continue;
2146
2147 r = sd_bus_wait(bus, (uint64_t) -1);
2148 if (r < 0)
2149 return r;
2150 }
2151 }
2152
2153 _public_ int sd_bus_call(
2154 sd_bus *bus,
2155 sd_bus_message *_m,
2156 uint64_t usec,
2157 sd_bus_error *error,
2158 sd_bus_message **reply) {
2159
2160 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = sd_bus_message_ref(_m);
2161 usec_t timeout;
2162 uint64_t cookie;
2163 size_t i;
2164 int r;
2165
2166 bus_assert_return(m, -EINVAL, error);
2167 bus_assert_return(m->header->type == SD_BUS_MESSAGE_METHOD_CALL, -EINVAL, error);
2168 bus_assert_return(!(m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED), -EINVAL, error);
2169 bus_assert_return(!bus_error_is_dirty(error), -EINVAL, error);
2170
2171 if (bus)
2172 assert_return(bus = bus_resolve(bus), -ENOPKG);
2173 else
2174 assert_return(bus = m->bus, -ENOTCONN);
2175 bus_assert_return(!bus_pid_changed(bus), -ECHILD, error);
2176
2177 if (!BUS_IS_OPEN(bus->state)) {
2178 r = -ENOTCONN;
2179 goto fail;
2180 }
2181
2182 r = bus_ensure_running(bus);
2183 if (r < 0)
2184 goto fail;
2185
2186 i = bus->rqueue_size;
2187
2188 r = bus_seal_message(bus, m, usec);
2189 if (r < 0)
2190 goto fail;
2191
2192 r = bus_remarshal_message(bus, &m);
2193 if (r < 0)
2194 goto fail;
2195
2196 r = sd_bus_send(bus, m, &cookie);
2197 if (r < 0)
2198 goto fail;
2199
2200 timeout = calc_elapse(bus, m->timeout);
2201
2202 for (;;) {
2203 usec_t left;
2204
2205 while (i < bus->rqueue_size) {
2206 _cleanup_(sd_bus_message_unrefp) sd_bus_message *incoming = NULL;
2207
2208 incoming = sd_bus_message_ref(bus->rqueue[i]);
2209
2210 if (incoming->reply_cookie == cookie) {
2211 /* Found a match! */
2212
2213 rqueue_drop_one(bus, i);
2214 log_debug_bus_message(incoming);
2215
2216 if (incoming->header->type == SD_BUS_MESSAGE_METHOD_RETURN) {
2217
2218 if (incoming->n_fds <= 0 || bus->accept_fd) {
2219 if (reply)
2220 *reply = TAKE_PTR(incoming);
2221
2222 return 1;
2223 }
2224
2225 return sd_bus_error_setf(error, SD_BUS_ERROR_INCONSISTENT_MESSAGE, "Reply message contained file descriptors which I couldn't accept. Sorry.");
2226
2227 } else if (incoming->header->type == SD_BUS_MESSAGE_METHOD_ERROR)
2228 return sd_bus_error_copy(error, &incoming->error);
2229 else {
2230 r = -EIO;
2231 goto fail;
2232 }
2233
2234 } else if (BUS_MESSAGE_COOKIE(incoming) == cookie &&
2235 bus->unique_name &&
2236 incoming->sender &&
2237 streq(bus->unique_name, incoming->sender)) {
2238
2239 rqueue_drop_one(bus, i);
2240
2241 /* Our own message? Somebody is trying to send its own client a message,
2242 * let's not dead-lock, let's fail immediately. */
2243
2244 r = -ELOOP;
2245 goto fail;
2246 }
2247
2248 /* Try to read more, right-away */
2249 i++;
2250 }
2251
2252 r = bus_read_message(bus);
2253 if (r < 0) {
2254 if (ERRNO_IS_DISCONNECT(r)) {
2255 bus_enter_closing(bus);
2256 r = -ECONNRESET;
2257 }
2258
2259 goto fail;
2260 }
2261 if (r > 0)
2262 continue;
2263
2264 if (timeout > 0) {
2265 usec_t n;
2266
2267 n = now(CLOCK_MONOTONIC);
2268 if (n >= timeout) {
2269 r = -ETIMEDOUT;
2270 goto fail;
2271 }
2272
2273 left = timeout - n;
2274 } else
2275 left = (uint64_t) -1;
2276
2277 r = bus_poll(bus, true, left);
2278 if (r < 0)
2279 goto fail;
2280 if (r == 0) {
2281 r = -ETIMEDOUT;
2282 goto fail;
2283 }
2284
2285 r = dispatch_wqueue(bus);
2286 if (r < 0) {
2287 if (ERRNO_IS_DISCONNECT(r)) {
2288 bus_enter_closing(bus);
2289 r = -ECONNRESET;
2290 }
2291
2292 goto fail;
2293 }
2294 }
2295
2296 fail:
2297 return sd_bus_error_set_errno(error, r);
2298 }
2299
2300 _public_ int sd_bus_get_fd(sd_bus *bus) {
2301 assert_return(bus, -EINVAL);
2302 assert_return(bus = bus_resolve(bus), -ENOPKG);
2303 assert_return(bus->input_fd == bus->output_fd, -EPERM);
2304 assert_return(!bus_pid_changed(bus), -ECHILD);
2305
2306 if (bus->state == BUS_CLOSED)
2307 return -ENOTCONN;
2308
2309 if (bus->inotify_fd >= 0)
2310 return bus->inotify_fd;
2311
2312 if (bus->input_fd >= 0)
2313 return bus->input_fd;
2314
2315 return -ENOTCONN;
2316 }
2317
2318 _public_ int sd_bus_get_events(sd_bus *bus) {
2319 int flags = 0;
2320
2321 assert_return(bus, -EINVAL);
2322 assert_return(bus = bus_resolve(bus), -ENOPKG);
2323 assert_return(!bus_pid_changed(bus), -ECHILD);
2324
2325 switch (bus->state) {
2326
2327 case BUS_UNSET:
2328 case BUS_CLOSED:
2329 return -ENOTCONN;
2330
2331 case BUS_WATCH_BIND:
2332 flags |= POLLIN;
2333 break;
2334
2335 case BUS_OPENING:
2336 flags |= POLLOUT;
2337 break;
2338
2339 case BUS_AUTHENTICATING:
2340 if (bus_socket_auth_needs_write(bus))
2341 flags |= POLLOUT;
2342
2343 flags |= POLLIN;
2344 break;
2345
2346 case BUS_RUNNING:
2347 case BUS_HELLO:
2348 if (bus->rqueue_size <= 0)
2349 flags |= POLLIN;
2350 if (bus->wqueue_size > 0)
2351 flags |= POLLOUT;
2352 break;
2353
2354 case BUS_CLOSING:
2355 break;
2356
2357 default:
2358 assert_not_reached("Unknown state");
2359 }
2360
2361 return flags;
2362 }
2363
2364 _public_ int sd_bus_get_timeout(sd_bus *bus, uint64_t *timeout_usec) {
2365 struct reply_callback *c;
2366
2367 assert_return(bus, -EINVAL);
2368 assert_return(bus = bus_resolve(bus), -ENOPKG);
2369 assert_return(timeout_usec, -EINVAL);
2370 assert_return(!bus_pid_changed(bus), -ECHILD);
2371
2372 if (!BUS_IS_OPEN(bus->state) && bus->state != BUS_CLOSING)
2373 return -ENOTCONN;
2374
2375 if (bus->track_queue) {
2376 *timeout_usec = 0;
2377 return 1;
2378 }
2379
2380 switch (bus->state) {
2381
2382 case BUS_AUTHENTICATING:
2383 *timeout_usec = bus->auth_timeout;
2384 return 1;
2385
2386 case BUS_RUNNING:
2387 case BUS_HELLO:
2388 if (bus->rqueue_size > 0) {
2389 *timeout_usec = 0;
2390 return 1;
2391 }
2392
2393 c = prioq_peek(bus->reply_callbacks_prioq);
2394 if (!c) {
2395 *timeout_usec = (uint64_t) -1;
2396 return 0;
2397 }
2398
2399 if (c->timeout_usec == 0) {
2400 *timeout_usec = (uint64_t) -1;
2401 return 0;
2402 }
2403
2404 *timeout_usec = c->timeout_usec;
2405 return 1;
2406
2407 case BUS_CLOSING:
2408 *timeout_usec = 0;
2409 return 1;
2410
2411 case BUS_WATCH_BIND:
2412 case BUS_OPENING:
2413 *timeout_usec = (uint64_t) -1;
2414 return 0;
2415
2416 default:
2417 assert_not_reached("Unknown or unexpected stat");
2418 }
2419 }
2420
2421 static int process_timeout(sd_bus *bus) {
2422 _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
2423 _cleanup_(sd_bus_message_unrefp) sd_bus_message* m = NULL;
2424 struct reply_callback *c;
2425 sd_bus_slot *slot;
2426 bool is_hello;
2427 usec_t n;
2428 int r;
2429
2430 assert(bus);
2431 assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO));
2432
2433 c = prioq_peek(bus->reply_callbacks_prioq);
2434 if (!c)
2435 return 0;
2436
2437 n = now(CLOCK_MONOTONIC);
2438 if (c->timeout_usec > n)
2439 return 0;
2440
2441 r = bus_message_new_synthetic_error(
2442 bus,
2443 c->cookie,
2444 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Method call timed out"),
2445 &m);
2446 if (r < 0)
2447 return r;
2448
2449 m->read_counter = ++bus->read_counter;
2450
2451 r = bus_seal_synthetic_message(bus, m);
2452 if (r < 0)
2453 return r;
2454
2455 assert_se(prioq_pop(bus->reply_callbacks_prioq) == c);
2456 c->timeout_usec = 0;
2457
2458 ordered_hashmap_remove(bus->reply_callbacks, &c->cookie);
2459 c->cookie = 0;
2460
2461 slot = container_of(c, sd_bus_slot, reply_callback);
2462
2463 bus->iteration_counter++;
2464
2465 is_hello = bus->state == BUS_HELLO && c->callback == hello_callback;
2466
2467 bus->current_message = m;
2468 bus->current_slot = sd_bus_slot_ref(slot);
2469 bus->current_handler = c->callback;
2470 bus->current_userdata = slot->userdata;
2471 r = c->callback(m, slot->userdata, &error_buffer);
2472 bus->current_userdata = NULL;
2473 bus->current_handler = NULL;
2474 bus->current_slot = NULL;
2475 bus->current_message = NULL;
2476
2477 if (slot->floating)
2478 bus_slot_disconnect(slot, true);
2479
2480 sd_bus_slot_unref(slot);
2481
2482 /* When this is the hello message and it timed out, then make sure to propagate the error up, don't just log
2483 * and ignore the callback handler's return value. */
2484 if (is_hello)
2485 return r;
2486
2487 return bus_maybe_reply_error(m, r, &error_buffer);
2488 }
2489
2490 static int process_hello(sd_bus *bus, sd_bus_message *m) {
2491 assert(bus);
2492 assert(m);
2493
2494 if (bus->state != BUS_HELLO)
2495 return 0;
2496
2497 /* Let's make sure the first message on the bus is the HELLO
2498 * reply. But note that we don't actually parse the message
2499 * here (we leave that to the usual handling), we just verify
2500 * we don't let any earlier msg through. */
2501
2502 if (!IN_SET(m->header->type, SD_BUS_MESSAGE_METHOD_RETURN, SD_BUS_MESSAGE_METHOD_ERROR))
2503 return -EIO;
2504
2505 if (m->reply_cookie != 1)
2506 return -EIO;
2507
2508 return 0;
2509 }
2510
2511 static int process_reply(sd_bus *bus, sd_bus_message *m) {
2512 _cleanup_(sd_bus_message_unrefp) sd_bus_message *synthetic_reply = NULL;
2513 _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
2514 struct reply_callback *c;
2515 sd_bus_slot *slot;
2516 bool is_hello;
2517 int r;
2518
2519 assert(bus);
2520 assert(m);
2521
2522 if (!IN_SET(m->header->type, SD_BUS_MESSAGE_METHOD_RETURN, SD_BUS_MESSAGE_METHOD_ERROR))
2523 return 0;
2524
2525 if (m->destination && bus->unique_name && !streq_ptr(m->destination, bus->unique_name))
2526 return 0;
2527
2528 c = ordered_hashmap_remove(bus->reply_callbacks, &m->reply_cookie);
2529 if (!c)
2530 return 0;
2531
2532 c->cookie = 0;
2533
2534 slot = container_of(c, sd_bus_slot, reply_callback);
2535
2536 if (m->n_fds > 0 && !bus->accept_fd) {
2537
2538 /* If the reply contained a file descriptor which we
2539 * didn't want we pass an error instead. */
2540
2541 r = bus_message_new_synthetic_error(
2542 bus,
2543 m->reply_cookie,
2544 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INCONSISTENT_MESSAGE, "Reply message contained file descriptor"),
2545 &synthetic_reply);
2546 if (r < 0)
2547 return r;
2548
2549 /* Copy over original timestamp */
2550 synthetic_reply->realtime = m->realtime;
2551 synthetic_reply->monotonic = m->monotonic;
2552 synthetic_reply->seqnum = m->seqnum;
2553 synthetic_reply->read_counter = m->read_counter;
2554
2555 r = bus_seal_synthetic_message(bus, synthetic_reply);
2556 if (r < 0)
2557 return r;
2558
2559 m = synthetic_reply;
2560 } else {
2561 r = sd_bus_message_rewind(m, true);
2562 if (r < 0)
2563 return r;
2564 }
2565
2566 if (c->timeout_usec != 0) {
2567 prioq_remove(bus->reply_callbacks_prioq, c, &c->prioq_idx);
2568 c->timeout_usec = 0;
2569 }
2570
2571 is_hello = bus->state == BUS_HELLO && c->callback == hello_callback;
2572
2573 bus->current_slot = sd_bus_slot_ref(slot);
2574 bus->current_handler = c->callback;
2575 bus->current_userdata = slot->userdata;
2576 r = c->callback(m, slot->userdata, &error_buffer);
2577 bus->current_userdata = NULL;
2578 bus->current_handler = NULL;
2579 bus->current_slot = NULL;
2580
2581 if (slot->floating)
2582 bus_slot_disconnect(slot, true);
2583
2584 sd_bus_slot_unref(slot);
2585
2586 /* When this is the hello message and it failed, then make sure to propagate the error up, don't just log and
2587 * ignore the callback handler's return value. */
2588 if (is_hello)
2589 return r;
2590
2591 return bus_maybe_reply_error(m, r, &error_buffer);
2592 }
2593
2594 static int process_filter(sd_bus *bus, sd_bus_message *m) {
2595 _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
2596 struct filter_callback *l;
2597 int r;
2598
2599 assert(bus);
2600 assert(m);
2601
2602 do {
2603 bus->filter_callbacks_modified = false;
2604
2605 LIST_FOREACH(callbacks, l, bus->filter_callbacks) {
2606 sd_bus_slot *slot;
2607
2608 if (bus->filter_callbacks_modified)
2609 break;
2610
2611 /* Don't run this more than once per iteration */
2612 if (l->last_iteration == bus->iteration_counter)
2613 continue;
2614
2615 l->last_iteration = bus->iteration_counter;
2616
2617 r = sd_bus_message_rewind(m, true);
2618 if (r < 0)
2619 return r;
2620
2621 slot = container_of(l, sd_bus_slot, filter_callback);
2622
2623 bus->current_slot = sd_bus_slot_ref(slot);
2624 bus->current_handler = l->callback;
2625 bus->current_userdata = slot->userdata;
2626 r = l->callback(m, slot->userdata, &error_buffer);
2627 bus->current_userdata = NULL;
2628 bus->current_handler = NULL;
2629 bus->current_slot = sd_bus_slot_unref(slot);
2630
2631 r = bus_maybe_reply_error(m, r, &error_buffer);
2632 if (r != 0)
2633 return r;
2634
2635 }
2636
2637 } while (bus->filter_callbacks_modified);
2638
2639 return 0;
2640 }
2641
2642 static int process_match(sd_bus *bus, sd_bus_message *m) {
2643 int r;
2644
2645 assert(bus);
2646 assert(m);
2647
2648 do {
2649 bus->match_callbacks_modified = false;
2650
2651 r = bus_match_run(bus, &bus->match_callbacks, m);
2652 if (r != 0)
2653 return r;
2654
2655 } while (bus->match_callbacks_modified);
2656
2657 return 0;
2658 }
2659
2660 static int process_builtin(sd_bus *bus, sd_bus_message *m) {
2661 _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
2662 int r;
2663
2664 assert(bus);
2665 assert(m);
2666
2667 if (bus->is_monitor)
2668 return 0;
2669
2670 if (bus->manual_peer_interface)
2671 return 0;
2672
2673 if (m->header->type != SD_BUS_MESSAGE_METHOD_CALL)
2674 return 0;
2675
2676 if (!streq_ptr(m->interface, "org.freedesktop.DBus.Peer"))
2677 return 0;
2678
2679 if (m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED)
2680 return 1;
2681
2682 if (streq_ptr(m->member, "Ping"))
2683 r = sd_bus_message_new_method_return(m, &reply);
2684 else if (streq_ptr(m->member, "GetMachineId")) {
2685 sd_id128_t id;
2686 char sid[SD_ID128_STRING_MAX];
2687
2688 r = sd_id128_get_machine(&id);
2689 if (r < 0)
2690 return r;
2691
2692 r = sd_bus_message_new_method_return(m, &reply);
2693 if (r < 0)
2694 return r;
2695
2696 r = sd_bus_message_append(reply, "s", sd_id128_to_string(id, sid));
2697 } else {
2698 r = sd_bus_message_new_method_errorf(
2699 m, &reply,
2700 SD_BUS_ERROR_UNKNOWN_METHOD,
2701 "Unknown method '%s' on interface '%s'.", m->member, m->interface);
2702 }
2703 if (r < 0)
2704 return r;
2705
2706 r = sd_bus_send(bus, reply, NULL);
2707 if (r < 0)
2708 return r;
2709
2710 return 1;
2711 }
2712
2713 static int process_fd_check(sd_bus *bus, sd_bus_message *m) {
2714 assert(bus);
2715 assert(m);
2716
2717 /* If we got a message with a file descriptor which we didn't
2718 * want to accept, then let's drop it. How can this even
2719 * happen? For example, when the kernel queues a message into
2720 * an activatable names's queue which allows fds, and then is
2721 * delivered to us later even though we ourselves did not
2722 * negotiate it. */
2723
2724 if (bus->is_monitor)
2725 return 0;
2726
2727 if (m->n_fds <= 0)
2728 return 0;
2729
2730 if (bus->accept_fd)
2731 return 0;
2732
2733 if (m->header->type != SD_BUS_MESSAGE_METHOD_CALL)
2734 return 1; /* just eat it up */
2735
2736 return sd_bus_reply_method_errorf(m, SD_BUS_ERROR_INCONSISTENT_MESSAGE, "Message contains file descriptors, which I cannot accept. Sorry.");
2737 }
2738
2739 static int process_message(sd_bus *bus, sd_bus_message *m) {
2740 int r;
2741
2742 assert(bus);
2743 assert(m);
2744
2745 bus->current_message = m;
2746 bus->iteration_counter++;
2747
2748 log_debug_bus_message(m);
2749
2750 r = process_hello(bus, m);
2751 if (r != 0)
2752 goto finish;
2753
2754 r = process_reply(bus, m);
2755 if (r != 0)
2756 goto finish;
2757
2758 r = process_fd_check(bus, m);
2759 if (r != 0)
2760 goto finish;
2761
2762 r = process_filter(bus, m);
2763 if (r != 0)
2764 goto finish;
2765
2766 r = process_match(bus, m);
2767 if (r != 0)
2768 goto finish;
2769
2770 r = process_builtin(bus, m);
2771 if (r != 0)
2772 goto finish;
2773
2774 r = bus_process_object(bus, m);
2775
2776 finish:
2777 bus->current_message = NULL;
2778 return r;
2779 }
2780
2781 static int dispatch_track(sd_bus *bus) {
2782 assert(bus);
2783
2784 if (!bus->track_queue)
2785 return 0;
2786
2787 bus_track_dispatch(bus->track_queue);
2788 return 1;
2789 }
2790
2791 static int process_running(sd_bus *bus, sd_bus_message **ret) {
2792 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
2793 int r;
2794
2795 assert(bus);
2796 assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO));
2797
2798 r = process_timeout(bus);
2799 if (r != 0)
2800 goto null_message;
2801
2802 r = dispatch_wqueue(bus);
2803 if (r != 0)
2804 goto null_message;
2805
2806 r = dispatch_track(bus);
2807 if (r != 0)
2808 goto null_message;
2809
2810 r = dispatch_rqueue(bus, &m);
2811 if (r < 0)
2812 return r;
2813 if (!m)
2814 goto null_message;
2815
2816 r = process_message(bus, m);
2817 if (r != 0)
2818 goto null_message;
2819
2820 if (ret) {
2821 r = sd_bus_message_rewind(m, true);
2822 if (r < 0)
2823 return r;
2824
2825 *ret = TAKE_PTR(m);
2826 return 1;
2827 }
2828
2829 if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL) {
2830
2831 log_debug("Unprocessed message call sender=%s object=%s interface=%s member=%s",
2832 strna(sd_bus_message_get_sender(m)),
2833 strna(sd_bus_message_get_path(m)),
2834 strna(sd_bus_message_get_interface(m)),
2835 strna(sd_bus_message_get_member(m)));
2836
2837 r = sd_bus_reply_method_errorf(
2838 m,
2839 SD_BUS_ERROR_UNKNOWN_OBJECT,
2840 "Unknown object '%s'.", m->path);
2841 if (r < 0)
2842 return r;
2843 }
2844
2845 return 1;
2846
2847 null_message:
2848 if (r >= 0 && ret)
2849 *ret = NULL;
2850
2851 return r;
2852 }
2853
2854 static int bus_exit_now(sd_bus *bus) {
2855 assert(bus);
2856
2857 /* Exit due to close, if this is requested. If this is bus object is attached to an event source, invokes
2858 * sd_event_exit(), otherwise invokes libc exit(). */
2859
2860 if (bus->exited) /* did we already exit? */
2861 return 0;
2862 if (!bus->exit_triggered) /* was the exit condition triggered? */
2863 return 0;
2864 if (!bus->exit_on_disconnect) /* Shall we actually exit on disconnection? */
2865 return 0;
2866
2867 bus->exited = true; /* never exit more than once */
2868
2869 log_debug("Bus connection disconnected, exiting.");
2870
2871 if (bus->event)
2872 return sd_event_exit(bus->event, EXIT_FAILURE);
2873 else
2874 exit(EXIT_FAILURE);
2875
2876 assert_not_reached("exit() didn't exit?");
2877 }
2878
2879 static int process_closing_reply_callback(sd_bus *bus, struct reply_callback *c) {
2880 _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
2881 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
2882 sd_bus_slot *slot;
2883 int r;
2884
2885 assert(bus);
2886 assert(c);
2887
2888 r = bus_message_new_synthetic_error(
2889 bus,
2890 c->cookie,
2891 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Connection terminated"),
2892 &m);
2893 if (r < 0)
2894 return r;
2895
2896 m->read_counter = ++bus->read_counter;
2897
2898 r = bus_seal_synthetic_message(bus, m);
2899 if (r < 0)
2900 return r;
2901
2902 if (c->timeout_usec != 0) {
2903 prioq_remove(bus->reply_callbacks_prioq, c, &c->prioq_idx);
2904 c->timeout_usec = 0;
2905 }
2906
2907 ordered_hashmap_remove(bus->reply_callbacks, &c->cookie);
2908 c->cookie = 0;
2909
2910 slot = container_of(c, sd_bus_slot, reply_callback);
2911
2912 bus->iteration_counter++;
2913
2914 bus->current_message = m;
2915 bus->current_slot = sd_bus_slot_ref(slot);
2916 bus->current_handler = c->callback;
2917 bus->current_userdata = slot->userdata;
2918 r = c->callback(m, slot->userdata, &error_buffer);
2919 bus->current_userdata = NULL;
2920 bus->current_handler = NULL;
2921 bus->current_slot = NULL;
2922 bus->current_message = NULL;
2923
2924 if (slot->floating)
2925 bus_slot_disconnect(slot, true);
2926
2927 sd_bus_slot_unref(slot);
2928
2929 return bus_maybe_reply_error(m, r, &error_buffer);
2930 }
2931
2932 static int process_closing(sd_bus *bus, sd_bus_message **ret) {
2933 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
2934 struct reply_callback *c;
2935 int r;
2936
2937 assert(bus);
2938 assert(bus->state == BUS_CLOSING);
2939
2940 /* First, fail all outstanding method calls */
2941 c = ordered_hashmap_first(bus->reply_callbacks);
2942 if (c)
2943 return process_closing_reply_callback(bus, c);
2944
2945 /* Then, fake-drop all remaining bus tracking references */
2946 if (bus->tracks) {
2947 bus_track_close(bus->tracks);
2948 return 1;
2949 }
2950
2951 /* Then, synthesize a Disconnected message */
2952 r = sd_bus_message_new_signal(
2953 bus,
2954 &m,
2955 "/org/freedesktop/DBus/Local",
2956 "org.freedesktop.DBus.Local",
2957 "Disconnected");
2958 if (r < 0)
2959 return r;
2960
2961 bus_message_set_sender_local(bus, m);
2962 m->read_counter = ++bus->read_counter;
2963
2964 r = bus_seal_synthetic_message(bus, m);
2965 if (r < 0)
2966 return r;
2967
2968 sd_bus_close(bus);
2969
2970 bus->current_message = m;
2971 bus->iteration_counter++;
2972
2973 r = process_filter(bus, m);
2974 if (r != 0)
2975 goto finish;
2976
2977 r = process_match(bus, m);
2978 if (r != 0)
2979 goto finish;
2980
2981 /* Nothing else to do, exit now, if the condition holds */
2982 bus->exit_triggered = true;
2983 (void) bus_exit_now(bus);
2984
2985 if (ret)
2986 *ret = TAKE_PTR(m);
2987
2988 r = 1;
2989
2990 finish:
2991 bus->current_message = NULL;
2992
2993 return r;
2994 }
2995
2996 static int bus_process_internal(sd_bus *bus, sd_bus_message **ret) {
2997 int r;
2998
2999 /* Returns 0 when we didn't do anything. This should cause the
3000 * caller to invoke sd_bus_wait() before returning the next
3001 * time. Returns > 0 when we did something, which possibly
3002 * means *ret is filled in with an unprocessed message. */
3003
3004 assert_return(bus, -EINVAL);
3005 assert_return(bus = bus_resolve(bus), -ENOPKG);
3006 assert_return(!bus_pid_changed(bus), -ECHILD);
3007
3008 /* We don't allow recursively invoking sd_bus_process(). */
3009 assert_return(!bus->current_message, -EBUSY);
3010 assert(!bus->current_slot); /* This should be NULL whenever bus->current_message is */
3011
3012 BUS_DONT_DESTROY(bus);
3013
3014 switch (bus->state) {
3015
3016 case BUS_UNSET:
3017 return -ENOTCONN;
3018
3019 case BUS_CLOSED:
3020 return -ECONNRESET;
3021
3022 case BUS_WATCH_BIND:
3023 r = bus_socket_process_watch_bind(bus);
3024 break;
3025
3026 case BUS_OPENING:
3027 r = bus_socket_process_opening(bus);
3028 break;
3029
3030 case BUS_AUTHENTICATING:
3031 r = bus_socket_process_authenticating(bus);
3032 break;
3033
3034 case BUS_RUNNING:
3035 case BUS_HELLO:
3036 r = process_running(bus, ret);
3037 if (r >= 0)
3038 return r;
3039
3040 /* This branch initializes *ret, hence we don't use the generic error checking below */
3041 break;
3042
3043 case BUS_CLOSING:
3044 return process_closing(bus, ret);
3045
3046 default:
3047 assert_not_reached("Unknown state");
3048 }
3049
3050 if (ERRNO_IS_DISCONNECT(r)) {
3051 bus_enter_closing(bus);
3052 r = 1;
3053 } else if (r < 0)
3054 return r;
3055
3056 if (ret)
3057 *ret = NULL;
3058
3059 return r;
3060 }
3061
3062 _public_ int sd_bus_process(sd_bus *bus, sd_bus_message **ret) {
3063 return bus_process_internal(bus, ret);
3064 }
3065
3066 _public_ int sd_bus_process_priority(sd_bus *bus, int64_t priority, sd_bus_message **ret) {
3067 return bus_process_internal(bus, ret);
3068 }
3069
3070 static int bus_poll(sd_bus *bus, bool need_more, uint64_t timeout_usec) {
3071 struct pollfd p[2] = {};
3072 int r, n;
3073 struct timespec ts;
3074 usec_t m = USEC_INFINITY;
3075
3076 assert(bus);
3077
3078 if (bus->state == BUS_CLOSING)
3079 return 1;
3080
3081 if (!BUS_IS_OPEN(bus->state))
3082 return -ENOTCONN;
3083
3084 if (bus->state == BUS_WATCH_BIND) {
3085 assert(bus->inotify_fd >= 0);
3086
3087 p[0].events = POLLIN;
3088 p[0].fd = bus->inotify_fd;
3089 n = 1;
3090 } else {
3091 int e;
3092
3093 e = sd_bus_get_events(bus);
3094 if (e < 0)
3095 return e;
3096
3097 if (need_more)
3098 /* The caller really needs some more data, he doesn't
3099 * care about what's already read, or any timeouts
3100 * except its own. */
3101 e |= POLLIN;
3102 else {
3103 usec_t until;
3104 /* The caller wants to process if there's something to
3105 * process, but doesn't care otherwise */
3106
3107 r = sd_bus_get_timeout(bus, &until);
3108 if (r < 0)
3109 return r;
3110 if (r > 0)
3111 m = usec_sub_unsigned(until, now(CLOCK_MONOTONIC));
3112 }
3113
3114 p[0].fd = bus->input_fd;
3115 if (bus->output_fd == bus->input_fd) {
3116 p[0].events = e;
3117 n = 1;
3118 } else {
3119 p[0].events = e & POLLIN;
3120 p[1].fd = bus->output_fd;
3121 p[1].events = e & POLLOUT;
3122 n = 2;
3123 }
3124 }
3125
3126 if (timeout_usec != (uint64_t) -1 && (m == USEC_INFINITY || timeout_usec < m))
3127 m = timeout_usec;
3128
3129 r = ppoll(p, n, m == USEC_INFINITY ? NULL : timespec_store(&ts, m), NULL);
3130 if (r < 0)
3131 return -errno;
3132 if (r == 0)
3133 return 0;
3134
3135 if (p[0].revents & POLLNVAL)
3136 return -EBADF;
3137 if (n >= 2 && (p[1].revents & POLLNVAL))
3138 return -EBADF;
3139
3140 return 1;
3141 }
3142
3143 _public_ int sd_bus_wait(sd_bus *bus, uint64_t timeout_usec) {
3144
3145 assert_return(bus, -EINVAL);
3146 assert_return(bus = bus_resolve(bus), -ENOPKG);
3147 assert_return(!bus_pid_changed(bus), -ECHILD);
3148
3149 if (bus->state == BUS_CLOSING)
3150 return 0;
3151
3152 if (!BUS_IS_OPEN(bus->state))
3153 return -ENOTCONN;
3154
3155 if (bus->rqueue_size > 0)
3156 return 0;
3157
3158 return bus_poll(bus, false, timeout_usec);
3159 }
3160
3161 _public_ int sd_bus_flush(sd_bus *bus) {
3162 int r;
3163
3164 assert_return(bus, -EINVAL);
3165 assert_return(bus = bus_resolve(bus), -ENOPKG);
3166 assert_return(!bus_pid_changed(bus), -ECHILD);
3167
3168 if (bus->state == BUS_CLOSING)
3169 return 0;
3170
3171 if (!BUS_IS_OPEN(bus->state))
3172 return -ENOTCONN;
3173
3174 /* We never were connected? Don't hang in inotify for good, as there's no timeout set for it */
3175 if (bus->state == BUS_WATCH_BIND)
3176 return -EUNATCH;
3177
3178 r = bus_ensure_running(bus);
3179 if (r < 0)
3180 return r;
3181
3182 if (bus->wqueue_size <= 0)
3183 return 0;
3184
3185 for (;;) {
3186 r = dispatch_wqueue(bus);
3187 if (r < 0) {
3188 if (ERRNO_IS_DISCONNECT(r)) {
3189 bus_enter_closing(bus);
3190 return -ECONNRESET;
3191 }
3192
3193 return r;
3194 }
3195
3196 if (bus->wqueue_size <= 0)
3197 return 0;
3198
3199 r = bus_poll(bus, false, (uint64_t) -1);
3200 if (r < 0)
3201 return r;
3202 }
3203 }
3204
3205 _public_ int sd_bus_add_filter(
3206 sd_bus *bus,
3207 sd_bus_slot **slot,
3208 sd_bus_message_handler_t callback,
3209 void *userdata) {
3210
3211 sd_bus_slot *s;
3212
3213 assert_return(bus, -EINVAL);
3214 assert_return(bus = bus_resolve(bus), -ENOPKG);
3215 assert_return(callback, -EINVAL);
3216 assert_return(!bus_pid_changed(bus), -ECHILD);
3217
3218 s = bus_slot_allocate(bus, !slot, BUS_FILTER_CALLBACK, sizeof(struct filter_callback), userdata);
3219 if (!s)
3220 return -ENOMEM;
3221
3222 s->filter_callback.callback = callback;
3223
3224 bus->filter_callbacks_modified = true;
3225 LIST_PREPEND(callbacks, bus->filter_callbacks, &s->filter_callback);
3226
3227 if (slot)
3228 *slot = s;
3229
3230 return 0;
3231 }
3232
3233 static int add_match_callback(
3234 sd_bus_message *m,
3235 void *userdata,
3236 sd_bus_error *ret_error) {
3237
3238 sd_bus_slot *match_slot = userdata;
3239 bool failed = false;
3240 int r;
3241
3242 assert(m);
3243 assert(match_slot);
3244
3245 sd_bus_slot_ref(match_slot);
3246
3247 if (sd_bus_message_is_method_error(m, NULL)) {
3248 log_debug_errno(sd_bus_message_get_errno(m),
3249 "Unable to add match %s, failing connection: %s",
3250 match_slot->match_callback.match_string,
3251 sd_bus_message_get_error(m)->message);
3252
3253 failed = true;
3254 } else
3255 log_debug("Match %s successfully installed.", match_slot->match_callback.match_string);
3256
3257 if (match_slot->match_callback.install_callback) {
3258 sd_bus *bus;
3259
3260 bus = sd_bus_message_get_bus(m);
3261
3262 /* This function has been called as slot handler, and we want to call another slot handler. Let's
3263 * update the slot callback metadata temporarily with our own data, and then revert back to the old
3264 * values. */
3265
3266 assert(bus->current_slot == match_slot->match_callback.install_slot);
3267 assert(bus->current_handler == add_match_callback);
3268 assert(bus->current_userdata == userdata);
3269
3270 bus->current_slot = match_slot;
3271 bus->current_handler = match_slot->match_callback.install_callback;
3272 bus->current_userdata = match_slot->userdata;
3273
3274 r = match_slot->match_callback.install_callback(m, match_slot->userdata, ret_error);
3275
3276 bus->current_slot = match_slot->match_callback.install_slot;
3277 bus->current_handler = add_match_callback;
3278 bus->current_userdata = userdata;
3279 } else {
3280 if (failed) /* Generic failure handling: destroy the connection */
3281 bus_enter_closing(sd_bus_message_get_bus(m));
3282
3283 r = 1;
3284 }
3285
3286 /* We don't need the install method reply slot anymore, let's free it */
3287 match_slot->match_callback.install_slot = sd_bus_slot_unref(match_slot->match_callback.install_slot);
3288
3289 if (failed && match_slot->floating)
3290 bus_slot_disconnect(match_slot, true);
3291
3292 sd_bus_slot_unref(match_slot);
3293
3294 return r;
3295 }
3296
3297 static int bus_add_match_full(
3298 sd_bus *bus,
3299 sd_bus_slot **slot,
3300 bool asynchronous,
3301 const char *match,
3302 sd_bus_message_handler_t callback,
3303 sd_bus_message_handler_t install_callback,
3304 void *userdata) {
3305
3306 struct bus_match_component *components = NULL;
3307 unsigned n_components = 0;
3308 sd_bus_slot *s = NULL;
3309 int r = 0;
3310
3311 assert_return(bus, -EINVAL);
3312 assert_return(bus = bus_resolve(bus), -ENOPKG);
3313 assert_return(match, -EINVAL);
3314 assert_return(!bus_pid_changed(bus), -ECHILD);
3315
3316 r = bus_match_parse(match, &components, &n_components);
3317 if (r < 0)
3318 goto finish;
3319
3320 s = bus_slot_allocate(bus, !slot, BUS_MATCH_CALLBACK, sizeof(struct match_callback), userdata);
3321 if (!s) {
3322 r = -ENOMEM;
3323 goto finish;
3324 }
3325
3326 s->match_callback.callback = callback;
3327 s->match_callback.install_callback = install_callback;
3328
3329 if (bus->bus_client) {
3330 enum bus_match_scope scope;
3331
3332 scope = bus_match_get_scope(components, n_components);
3333
3334 /* Do not install server-side matches for matches against the local service, interface or bus path. */
3335 if (scope != BUS_MATCH_LOCAL) {
3336
3337 /* We store the original match string, so that we can use it to remove the match again. */
3338
3339 s->match_callback.match_string = strdup(match);
3340 if (!s->match_callback.match_string) {
3341 r = -ENOMEM;
3342 goto finish;
3343 }
3344
3345 if (asynchronous) {
3346 r = bus_add_match_internal_async(bus,
3347 &s->match_callback.install_slot,
3348 s->match_callback.match_string,
3349 add_match_callback,
3350 s);
3351
3352 if (r < 0)
3353 return r;
3354
3355 /* Make the slot of the match call floating now. We need the reference, but we don't
3356 * want that this match pins the bus object, hence we first create it non-floating, but
3357 * then make it floating. */
3358 r = sd_bus_slot_set_floating(s->match_callback.install_slot, true);
3359 } else
3360 r = bus_add_match_internal(bus, s->match_callback.match_string, &s->match_callback.after);
3361 if (r < 0)
3362 goto finish;
3363
3364 s->match_added = true;
3365 }
3366 }
3367
3368 bus->match_callbacks_modified = true;
3369 r = bus_match_add(&bus->match_callbacks, components, n_components, &s->match_callback);
3370 if (r < 0)
3371 goto finish;
3372
3373 if (slot)
3374 *slot = s;
3375 s = NULL;
3376
3377 finish:
3378 bus_match_parse_free(components, n_components);
3379 sd_bus_slot_unref(s);
3380
3381 return r;
3382 }
3383
3384 _public_ int sd_bus_add_match(
3385 sd_bus *bus,
3386 sd_bus_slot **slot,
3387 const char *match,
3388 sd_bus_message_handler_t callback,
3389 void *userdata) {
3390
3391 return bus_add_match_full(bus, slot, false, match, callback, NULL, userdata);
3392 }
3393
3394 _public_ int sd_bus_add_match_async(
3395 sd_bus *bus,
3396 sd_bus_slot **slot,
3397 const char *match,
3398 sd_bus_message_handler_t callback,
3399 sd_bus_message_handler_t install_callback,
3400 void *userdata) {
3401
3402 return bus_add_match_full(bus, slot, true, match, callback, install_callback, userdata);
3403 }
3404
3405 bool bus_pid_changed(sd_bus *bus) {
3406 assert(bus);
3407
3408 /* We don't support people creating a bus connection and
3409 * keeping it around over a fork(). Let's complain. */
3410
3411 return bus->original_pid != getpid_cached();
3412 }
3413
3414 static int io_callback(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
3415 sd_bus *bus = userdata;
3416 int r;
3417
3418 assert(bus);
3419
3420 /* Note that this is called both on input_fd, output_fd as well as inotify_fd events */
3421
3422 r = sd_bus_process(bus, NULL);
3423 if (r < 0) {
3424 log_debug_errno(r, "Processing of bus failed, closing down: %m");
3425 bus_enter_closing(bus);
3426 }
3427
3428 return 1;
3429 }
3430
3431 static int time_callback(sd_event_source *s, uint64_t usec, void *userdata) {
3432 sd_bus *bus = userdata;
3433 int r;
3434
3435 assert(bus);
3436
3437 r = sd_bus_process(bus, NULL);
3438 if (r < 0) {
3439 log_debug_errno(r, "Processing of bus failed, closing down: %m");
3440 bus_enter_closing(bus);
3441 }
3442
3443 return 1;
3444 }
3445
3446 static int prepare_callback(sd_event_source *s, void *userdata) {
3447 sd_bus *bus = userdata;
3448 int r, e;
3449 usec_t until;
3450
3451 assert(s);
3452 assert(bus);
3453
3454 e = sd_bus_get_events(bus);
3455 if (e < 0) {
3456 r = e;
3457 goto fail;
3458 }
3459
3460 if (bus->output_fd != bus->input_fd) {
3461
3462 r = sd_event_source_set_io_events(bus->input_io_event_source, e & POLLIN);
3463 if (r < 0)
3464 goto fail;
3465
3466 r = sd_event_source_set_io_events(bus->output_io_event_source, e & POLLOUT);
3467 } else
3468 r = sd_event_source_set_io_events(bus->input_io_event_source, e);
3469 if (r < 0)
3470 goto fail;
3471
3472 r = sd_bus_get_timeout(bus, &until);
3473 if (r < 0)
3474 goto fail;
3475 if (r > 0) {
3476 int j;
3477
3478 j = sd_event_source_set_time(bus->time_event_source, until);
3479 if (j < 0) {
3480 r = j;
3481 goto fail;
3482 }
3483 }
3484
3485 r = sd_event_source_set_enabled(bus->time_event_source, r > 0);
3486 if (r < 0)
3487 goto fail;
3488
3489 return 1;
3490
3491 fail:
3492 log_debug_errno(r, "Preparing of bus events failed, closing down: %m");
3493 bus_enter_closing(bus);
3494
3495 return 1;
3496 }
3497
3498 static int quit_callback(sd_event_source *event, void *userdata) {
3499 sd_bus *bus = userdata;
3500
3501 assert(event);
3502
3503 if (bus->close_on_exit) {
3504 sd_bus_flush(bus);
3505 sd_bus_close(bus);
3506 }
3507
3508 return 1;
3509 }
3510
3511 int bus_attach_io_events(sd_bus *bus) {
3512 int r;
3513
3514 assert(bus);
3515
3516 if (bus->input_fd < 0)
3517 return 0;
3518
3519 if (!bus->event)
3520 return 0;
3521
3522 if (!bus->input_io_event_source) {
3523 r = sd_event_add_io(bus->event, &bus->input_io_event_source, bus->input_fd, 0, io_callback, bus);
3524 if (r < 0)
3525 return r;
3526
3527 r = sd_event_source_set_prepare(bus->input_io_event_source, prepare_callback);
3528 if (r < 0)
3529 return r;
3530
3531 r = sd_event_source_set_priority(bus->input_io_event_source, bus->event_priority);
3532 if (r < 0)
3533 return r;
3534
3535 r = sd_event_source_set_description(bus->input_io_event_source, "bus-input");
3536 } else
3537 r = sd_event_source_set_io_fd(bus->input_io_event_source, bus->input_fd);
3538
3539 if (r < 0)
3540 return r;
3541
3542 if (bus->output_fd != bus->input_fd) {
3543 assert(bus->output_fd >= 0);
3544
3545 if (!bus->output_io_event_source) {
3546 r = sd_event_add_io(bus->event, &bus->output_io_event_source, bus->output_fd, 0, io_callback, bus);
3547 if (r < 0)
3548 return r;
3549
3550 r = sd_event_source_set_priority(bus->output_io_event_source, bus->event_priority);
3551 if (r < 0)
3552 return r;
3553
3554 r = sd_event_source_set_description(bus->input_io_event_source, "bus-output");
3555 } else
3556 r = sd_event_source_set_io_fd(bus->output_io_event_source, bus->output_fd);
3557
3558 if (r < 0)
3559 return r;
3560 }
3561
3562 return 0;
3563 }
3564
3565 static void bus_detach_io_events(sd_bus *bus) {
3566 assert(bus);
3567
3568 if (bus->input_io_event_source) {
3569 sd_event_source_set_enabled(bus->input_io_event_source, SD_EVENT_OFF);
3570 bus->input_io_event_source = sd_event_source_unref(bus->input_io_event_source);
3571 }
3572
3573 if (bus->output_io_event_source) {
3574 sd_event_source_set_enabled(bus->output_io_event_source, SD_EVENT_OFF);
3575 bus->output_io_event_source = sd_event_source_unref(bus->output_io_event_source);
3576 }
3577 }
3578
3579 int bus_attach_inotify_event(sd_bus *bus) {
3580 int r;
3581
3582 assert(bus);
3583
3584 if (bus->inotify_fd < 0)
3585 return 0;
3586
3587 if (!bus->event)
3588 return 0;
3589
3590 if (!bus->inotify_event_source) {
3591 r = sd_event_add_io(bus->event, &bus->inotify_event_source, bus->inotify_fd, EPOLLIN, io_callback, bus);
3592 if (r < 0)
3593 return r;
3594
3595 r = sd_event_source_set_priority(bus->inotify_event_source, bus->event_priority);
3596 if (r < 0)
3597 return r;
3598
3599 r = sd_event_source_set_description(bus->inotify_event_source, "bus-inotify");
3600 } else
3601 r = sd_event_source_set_io_fd(bus->inotify_event_source, bus->inotify_fd);
3602 if (r < 0)
3603 return r;
3604
3605 return 0;
3606 }
3607
3608 static void bus_detach_inotify_event(sd_bus *bus) {
3609 assert(bus);
3610
3611 if (bus->inotify_event_source) {
3612 sd_event_source_set_enabled(bus->inotify_event_source, SD_EVENT_OFF);
3613 bus->inotify_event_source = sd_event_source_unref(bus->inotify_event_source);
3614 }
3615 }
3616
3617 _public_ int sd_bus_attach_event(sd_bus *bus, sd_event *event, int priority) {
3618 int r;
3619
3620 assert_return(bus, -EINVAL);
3621 assert_return(bus = bus_resolve(bus), -ENOPKG);
3622 assert_return(!bus->event, -EBUSY);
3623
3624 assert(!bus->input_io_event_source);
3625 assert(!bus->output_io_event_source);
3626 assert(!bus->time_event_source);
3627
3628 if (event)
3629 bus->event = sd_event_ref(event);
3630 else {
3631 r = sd_event_default(&bus->event);
3632 if (r < 0)
3633 return r;
3634 }
3635
3636 bus->event_priority = priority;
3637
3638 r = sd_event_add_time(bus->event, &bus->time_event_source, CLOCK_MONOTONIC, 0, 0, time_callback, bus);
3639 if (r < 0)
3640 goto fail;
3641
3642 r = sd_event_source_set_priority(bus->time_event_source, priority);
3643 if (r < 0)
3644 goto fail;
3645
3646 r = sd_event_source_set_description(bus->time_event_source, "bus-time");
3647 if (r < 0)
3648 goto fail;
3649
3650 r = sd_event_add_exit(bus->event, &bus->quit_event_source, quit_callback, bus);
3651 if (r < 0)
3652 goto fail;
3653
3654 r = sd_event_source_set_description(bus->quit_event_source, "bus-exit");
3655 if (r < 0)
3656 goto fail;
3657
3658 r = bus_attach_io_events(bus);
3659 if (r < 0)
3660 goto fail;
3661
3662 r = bus_attach_inotify_event(bus);
3663 if (r < 0)
3664 goto fail;
3665
3666 return 0;
3667
3668 fail:
3669 sd_bus_detach_event(bus);
3670 return r;
3671 }
3672
3673 _public_ int sd_bus_detach_event(sd_bus *bus) {
3674 assert_return(bus, -EINVAL);
3675 assert_return(bus = bus_resolve(bus), -ENOPKG);
3676
3677 if (!bus->event)
3678 return 0;
3679
3680 bus_detach_io_events(bus);
3681 bus_detach_inotify_event(bus);
3682
3683 if (bus->time_event_source) {
3684 sd_event_source_set_enabled(bus->time_event_source, SD_EVENT_OFF);
3685 bus->time_event_source = sd_event_source_unref(bus->time_event_source);
3686 }
3687
3688 if (bus->quit_event_source) {
3689 sd_event_source_set_enabled(bus->quit_event_source, SD_EVENT_OFF);
3690 bus->quit_event_source = sd_event_source_unref(bus->quit_event_source);
3691 }
3692
3693 bus->event = sd_event_unref(bus->event);
3694 return 1;
3695 }
3696
3697 _public_ sd_event* sd_bus_get_event(sd_bus *bus) {
3698 assert_return(bus = bus_resolve(bus), NULL);
3699
3700 return bus->event;
3701 }
3702
3703 _public_ sd_bus_message* sd_bus_get_current_message(sd_bus *bus) {
3704 assert_return(bus = bus_resolve(bus), NULL);
3705
3706 return bus->current_message;
3707 }
3708
3709 _public_ sd_bus_slot* sd_bus_get_current_slot(sd_bus *bus) {
3710 assert_return(bus = bus_resolve(bus), NULL);
3711
3712 return bus->current_slot;
3713 }
3714
3715 _public_ sd_bus_message_handler_t sd_bus_get_current_handler(sd_bus *bus) {
3716 assert_return(bus = bus_resolve(bus), NULL);
3717
3718 return bus->current_handler;
3719 }
3720
3721 _public_ void* sd_bus_get_current_userdata(sd_bus *bus) {
3722 assert_return(bus = bus_resolve(bus), NULL);
3723
3724 return bus->current_userdata;
3725 }
3726
3727 static int bus_default(int (*bus_open)(sd_bus **), sd_bus **default_bus, sd_bus **ret) {
3728 sd_bus *b = NULL;
3729 int r;
3730
3731 assert(bus_open);
3732 assert(default_bus);
3733
3734 if (!ret)
3735 return !!*default_bus;
3736
3737 if (*default_bus) {
3738 *ret = sd_bus_ref(*default_bus);
3739 return 0;
3740 }
3741
3742 r = bus_open(&b);
3743 if (r < 0)
3744 return r;
3745
3746 b->default_bus_ptr = default_bus;
3747 b->tid = gettid();
3748 *default_bus = b;
3749
3750 *ret = b;
3751 return 1;
3752 }
3753
3754 _public_ int sd_bus_default_system(sd_bus **ret) {
3755 return bus_default(sd_bus_open_system, &default_system_bus, ret);
3756 }
3757
3758 _public_ int sd_bus_default_user(sd_bus **ret) {
3759 return bus_default(sd_bus_open_user, &default_user_bus, ret);
3760 }
3761
3762 _public_ int sd_bus_default(sd_bus **ret) {
3763 int (*bus_open)(sd_bus **) = NULL;
3764 sd_bus **busp;
3765
3766 busp = bus_choose_default(&bus_open);
3767 return bus_default(bus_open, busp, ret);
3768 }
3769
3770 _public_ int sd_bus_get_tid(sd_bus *b, pid_t *tid) {
3771 assert_return(b, -EINVAL);
3772 assert_return(tid, -EINVAL);
3773 assert_return(!bus_pid_changed(b), -ECHILD);
3774
3775 if (b->tid != 0) {
3776 *tid = b->tid;
3777 return 0;
3778 }
3779
3780 if (b->event)
3781 return sd_event_get_tid(b->event, tid);
3782
3783 return -ENXIO;
3784 }
3785
3786 _public_ int sd_bus_path_encode(const char *prefix, const char *external_id, char **ret_path) {
3787 _cleanup_free_ char *e = NULL;
3788 char *ret;
3789
3790 assert_return(object_path_is_valid(prefix), -EINVAL);
3791 assert_return(external_id, -EINVAL);
3792 assert_return(ret_path, -EINVAL);
3793
3794 e = bus_label_escape(external_id);
3795 if (!e)
3796 return -ENOMEM;
3797
3798 ret = path_join(prefix, e);
3799 if (!ret)
3800 return -ENOMEM;
3801
3802 *ret_path = ret;
3803 return 0;
3804 }
3805
3806 _public_ int sd_bus_path_decode(const char *path, const char *prefix, char **external_id) {
3807 const char *e;
3808 char *ret;
3809
3810 assert_return(object_path_is_valid(path), -EINVAL);
3811 assert_return(object_path_is_valid(prefix), -EINVAL);
3812 assert_return(external_id, -EINVAL);
3813
3814 e = object_path_startswith(path, prefix);
3815 if (!e) {
3816 *external_id = NULL;
3817 return 0;
3818 }
3819
3820 ret = bus_label_unescape(e);
3821 if (!ret)
3822 return -ENOMEM;
3823
3824 *external_id = ret;
3825 return 1;
3826 }
3827
3828 _public_ int sd_bus_path_encode_many(char **out, const char *path_template, ...) {
3829 _cleanup_strv_free_ char **labels = NULL;
3830 char *path, *path_pos, **label_pos;
3831 const char *sep, *template_pos;
3832 size_t path_length;
3833 va_list list;
3834 int r;
3835
3836 assert_return(out, -EINVAL);
3837 assert_return(path_template, -EINVAL);
3838
3839 path_length = strlen(path_template);
3840
3841 va_start(list, path_template);
3842 for (sep = strchr(path_template, '%'); sep; sep = strchr(sep + 1, '%')) {
3843 const char *arg;
3844 char *label;
3845
3846 arg = va_arg(list, const char *);
3847 if (!arg) {
3848 va_end(list);
3849 return -EINVAL;
3850 }
3851
3852 label = bus_label_escape(arg);
3853 if (!label) {
3854 va_end(list);
3855 return -ENOMEM;
3856 }
3857
3858 r = strv_consume(&labels, label);
3859 if (r < 0) {
3860 va_end(list);
3861 return r;
3862 }
3863
3864 /* add label length, but account for the format character */
3865 path_length += strlen(label) - 1;
3866 }
3867 va_end(list);
3868
3869 path = malloc(path_length + 1);
3870 if (!path)
3871 return -ENOMEM;
3872
3873 path_pos = path;
3874 label_pos = labels;
3875
3876 for (template_pos = path_template; *template_pos; ) {
3877 sep = strchrnul(template_pos, '%');
3878 path_pos = mempcpy(path_pos, template_pos, sep - template_pos);
3879 if (!*sep)
3880 break;
3881
3882 path_pos = stpcpy(path_pos, *label_pos++);
3883 template_pos = sep + 1;
3884 }
3885
3886 *path_pos = 0;
3887 *out = path;
3888 return 0;
3889 }
3890
3891 _public_ int sd_bus_path_decode_many(const char *path, const char *path_template, ...) {
3892 _cleanup_strv_free_ char **labels = NULL;
3893 const char *template_pos, *path_pos;
3894 char **label_pos;
3895 va_list list;
3896 int r;
3897
3898 /*
3899 * This decodes an object-path based on a template argument. The
3900 * template consists of a verbatim path, optionally including special
3901 * directives:
3902 *
3903 * - Each occurrence of '%' in the template matches an arbitrary
3904 * substring of a label in the given path. At most one such
3905 * directive is allowed per label. For each such directive, the
3906 * caller must provide an output parameter (char **) via va_arg. If
3907 * NULL is passed, the given label is verified, but not returned.
3908 * For each matched label, the *decoded* label is stored in the
3909 * passed output argument, and the caller is responsible to free
3910 * it. Note that the output arguments are only modified if the
3911 * actually path matched the template. Otherwise, they're left
3912 * untouched.
3913 *
3914 * This function returns <0 on error, 0 if the path does not match the
3915 * template, 1 if it matched.
3916 */
3917
3918 assert_return(path, -EINVAL);
3919 assert_return(path_template, -EINVAL);
3920
3921 path_pos = path;
3922
3923 for (template_pos = path_template; *template_pos; ) {
3924 const char *sep;
3925 size_t length;
3926 char *label;
3927
3928 /* verify everything until the next '%' matches verbatim */
3929 sep = strchrnul(template_pos, '%');
3930 length = sep - template_pos;
3931 if (strncmp(path_pos, template_pos, length))
3932 return 0;
3933
3934 path_pos += length;
3935 template_pos += length;
3936
3937 if (!*template_pos)
3938 break;
3939
3940 /* We found the next '%' character. Everything up until here
3941 * matched. We now skip ahead to the end of this label and make
3942 * sure it matches the tail of the label in the path. Then we
3943 * decode the string in-between and save it for later use. */
3944
3945 ++template_pos; /* skip over '%' */
3946
3947 sep = strchrnul(template_pos, '/');
3948 length = sep - template_pos; /* length of suffix to match verbatim */
3949
3950 /* verify the suffixes match */
3951 sep = strchrnul(path_pos, '/');
3952 if (sep - path_pos < (ssize_t)length ||
3953 strncmp(sep - length, template_pos, length))
3954 return 0;
3955
3956 template_pos += length; /* skip over matched label */
3957 length = sep - path_pos - length; /* length of sub-label to decode */
3958
3959 /* store unescaped label for later use */
3960 label = bus_label_unescape_n(path_pos, length);
3961 if (!label)
3962 return -ENOMEM;
3963
3964 r = strv_consume(&labels, label);
3965 if (r < 0)
3966 return r;
3967
3968 path_pos = sep; /* skip decoded label and suffix */
3969 }
3970
3971 /* end of template must match end of path */
3972 if (*path_pos)
3973 return 0;
3974
3975 /* copy the labels over to the caller */
3976 va_start(list, path_template);
3977 for (label_pos = labels; label_pos && *label_pos; ++label_pos) {
3978 char **arg;
3979
3980 arg = va_arg(list, char **);
3981 if (arg)
3982 *arg = *label_pos;
3983 else
3984 free(*label_pos);
3985 }
3986 va_end(list);
3987
3988 labels = mfree(labels);
3989 return 1;
3990 }
3991
3992 _public_ int sd_bus_try_close(sd_bus *bus) {
3993 assert_return(bus, -EINVAL);
3994 assert_return(bus = bus_resolve(bus), -ENOPKG);
3995 assert_return(!bus_pid_changed(bus), -ECHILD);
3996
3997 return -EOPNOTSUPP;
3998 }
3999
4000 _public_ int sd_bus_get_description(sd_bus *bus, const char **description) {
4001 assert_return(bus, -EINVAL);
4002 assert_return(bus = bus_resolve(bus), -ENOPKG);
4003 assert_return(description, -EINVAL);
4004 assert_return(bus->description, -ENXIO);
4005 assert_return(!bus_pid_changed(bus), -ECHILD);
4006
4007 if (bus->description)
4008 *description = bus->description;
4009 else if (bus->is_system)
4010 *description = "system";
4011 else if (bus->is_user)
4012 *description = "user";
4013 else
4014 *description = NULL;
4015
4016 return 0;
4017 }
4018
4019 _public_ int sd_bus_get_scope(sd_bus *bus, const char **scope) {
4020 assert_return(bus, -EINVAL);
4021 assert_return(bus = bus_resolve(bus), -ENOPKG);
4022 assert_return(scope, -EINVAL);
4023 assert_return(!bus_pid_changed(bus), -ECHILD);
4024
4025 if (bus->is_user) {
4026 *scope = "user";
4027 return 0;
4028 }
4029
4030 if (bus->is_system) {
4031 *scope = "system";
4032 return 0;
4033 }
4034
4035 return -ENODATA;
4036 }
4037
4038 _public_ int sd_bus_get_address(sd_bus *bus, const char **address) {
4039 assert_return(bus, -EINVAL);
4040 assert_return(bus = bus_resolve(bus), -ENOPKG);
4041 assert_return(address, -EINVAL);
4042 assert_return(!bus_pid_changed(bus), -ECHILD);
4043
4044 if (bus->address) {
4045 *address = bus->address;
4046 return 0;
4047 }
4048
4049 return -ENODATA;
4050 }
4051
4052 _public_ int sd_bus_get_creds_mask(sd_bus *bus, uint64_t *mask) {
4053 assert_return(bus, -EINVAL);
4054 assert_return(bus = bus_resolve(bus), -ENOPKG);
4055 assert_return(mask, -EINVAL);
4056 assert_return(!bus_pid_changed(bus), -ECHILD);
4057
4058 *mask = bus->creds_mask;
4059 return 0;
4060 }
4061
4062 _public_ int sd_bus_is_bus_client(sd_bus *bus) {
4063 assert_return(bus, -EINVAL);
4064 assert_return(bus = bus_resolve(bus), -ENOPKG);
4065 assert_return(!bus_pid_changed(bus), -ECHILD);
4066
4067 return bus->bus_client;
4068 }
4069
4070 _public_ int sd_bus_is_server(sd_bus *bus) {
4071 assert_return(bus, -EINVAL);
4072 assert_return(bus = bus_resolve(bus), -ENOPKG);
4073 assert_return(!bus_pid_changed(bus), -ECHILD);
4074
4075 return bus->is_server;
4076 }
4077
4078 _public_ int sd_bus_is_anonymous(sd_bus *bus) {
4079 assert_return(bus, -EINVAL);
4080 assert_return(bus = bus_resolve(bus), -ENOPKG);
4081 assert_return(!bus_pid_changed(bus), -ECHILD);
4082
4083 return bus->anonymous_auth;
4084 }
4085
4086 _public_ int sd_bus_is_trusted(sd_bus *bus) {
4087 assert_return(bus, -EINVAL);
4088 assert_return(bus = bus_resolve(bus), -ENOPKG);
4089 assert_return(!bus_pid_changed(bus), -ECHILD);
4090
4091 return bus->trusted;
4092 }
4093
4094 _public_ int sd_bus_is_monitor(sd_bus *bus) {
4095 assert_return(bus, -EINVAL);
4096 assert_return(bus = bus_resolve(bus), -ENOPKG);
4097 assert_return(!bus_pid_changed(bus), -ECHILD);
4098
4099 return bus->is_monitor;
4100 }
4101
4102 static void flush_close(sd_bus *bus) {
4103 if (!bus)
4104 return;
4105
4106 /* Flushes and closes the specified bus. We take a ref before,
4107 * to ensure the flushing does not cause the bus to be
4108 * unreferenced. */
4109
4110 sd_bus_flush_close_unref(sd_bus_ref(bus));
4111 }
4112
4113 _public_ void sd_bus_default_flush_close(void) {
4114 flush_close(default_starter_bus);
4115 flush_close(default_user_bus);
4116 flush_close(default_system_bus);
4117 }
4118
4119 _public_ int sd_bus_set_exit_on_disconnect(sd_bus *bus, int b) {
4120 assert_return(bus, -EINVAL);
4121 assert_return(bus = bus_resolve(bus), -ENOPKG);
4122
4123 /* Turns on exit-on-disconnect, and triggers it immediately if the bus connection was already
4124 * disconnected. Note that this is triggered exclusively on disconnections triggered by the server side, never
4125 * from the client side. */
4126 bus->exit_on_disconnect = b;
4127
4128 /* If the exit condition was triggered already, exit immediately. */
4129 return bus_exit_now(bus);
4130 }
4131
4132 _public_ int sd_bus_get_exit_on_disconnect(sd_bus *bus) {
4133 assert_return(bus, -EINVAL);
4134 assert_return(bus = bus_resolve(bus), -ENOPKG);
4135
4136 return bus->exit_on_disconnect;
4137 }
4138
4139 _public_ int sd_bus_set_sender(sd_bus *bus, const char *sender) {
4140 assert_return(bus, -EINVAL);
4141 assert_return(bus = bus_resolve(bus), -ENOPKG);
4142 assert_return(!bus->bus_client, -EPERM);
4143 assert_return(!sender || service_name_is_valid(sender), -EINVAL);
4144
4145 return free_and_strdup(&bus->patch_sender, sender);
4146 }
4147
4148 _public_ int sd_bus_get_sender(sd_bus *bus, const char **ret) {
4149 assert_return(bus, -EINVAL);
4150 assert_return(bus = bus_resolve(bus), -ENOPKG);
4151 assert_return(ret, -EINVAL);
4152
4153 if (!bus->patch_sender)
4154 return -ENODATA;
4155
4156 *ret = bus->patch_sender;
4157 return 0;
4158 }
4159
4160 _public_ int sd_bus_get_n_queued_read(sd_bus *bus, uint64_t *ret) {
4161 assert_return(bus, -EINVAL);
4162 assert_return(bus = bus_resolve(bus), -ENOPKG);
4163 assert_return(!bus_pid_changed(bus), -ECHILD);
4164 assert_return(ret, -EINVAL);
4165
4166 *ret = bus->rqueue_size;
4167 return 0;
4168 }
4169
4170 _public_ int sd_bus_get_n_queued_write(sd_bus *bus, uint64_t *ret) {
4171 assert_return(bus, -EINVAL);
4172 assert_return(bus = bus_resolve(bus), -ENOPKG);
4173 assert_return(!bus_pid_changed(bus), -ECHILD);
4174 assert_return(ret, -EINVAL);
4175
4176 *ret = bus->wqueue_size;
4177 return 0;
4178 }
4179
4180 _public_ int sd_bus_set_method_call_timeout(sd_bus *bus, uint64_t usec) {
4181 assert_return(bus, -EINVAL);
4182 assert_return(bus = bus_resolve(bus), -ENOPKG);
4183
4184 bus->method_call_timeout = usec;
4185 return 0;
4186 }
4187
4188 _public_ int sd_bus_get_method_call_timeout(sd_bus *bus, uint64_t *ret) {
4189 const char *e;
4190 usec_t usec;
4191
4192 assert_return(bus, -EINVAL);
4193 assert_return(bus = bus_resolve(bus), -ENOPKG);
4194 assert_return(ret, -EINVAL);
4195
4196 if (bus->method_call_timeout != 0) {
4197 *ret = bus->method_call_timeout;
4198 return 0;
4199 }
4200
4201 e = secure_getenv("SYSTEMD_BUS_TIMEOUT");
4202 if (e && parse_sec(e, &usec) >= 0 && usec != 0) {
4203 /* Save the parsed value to avoid multiple parsing. To change the timeout value,
4204 * use sd_bus_set_method_call_timeout() instead of setenv(). */
4205 *ret = bus->method_call_timeout = usec;
4206 return 0;
4207 }
4208
4209 *ret = bus->method_call_timeout = BUS_DEFAULT_TIMEOUT;
4210 return 0;
4211 }
4212
4213 _public_ int sd_bus_set_close_on_exit(sd_bus *bus, int b) {
4214 assert_return(bus, -EINVAL);
4215 assert_return(bus = bus_resolve(bus), -ENOPKG);
4216
4217 bus->close_on_exit = b;
4218 return 0;
4219 }
4220
4221 _public_ int sd_bus_get_close_on_exit(sd_bus *bus) {
4222 assert_return(bus, -EINVAL);
4223 assert_return(bus = bus_resolve(bus), -ENOPKG);
4224
4225 return bus->close_on_exit;
4226 }
4227
4228 _public_ int sd_bus_enqueue_for_read(sd_bus *bus, sd_bus_message *m) {
4229 int r;
4230
4231 assert_return(bus, -EINVAL);
4232 assert_return(bus = bus_resolve(bus), -ENOPKG);
4233 assert_return(m, -EINVAL);
4234 assert_return(m->sealed, -EINVAL);
4235 assert_return(!bus_pid_changed(bus), -ECHILD);
4236
4237 if (!BUS_IS_OPEN(bus->state))
4238 return -ENOTCONN;
4239
4240 /* Re-enqueue a message for reading. This is primarily useful for PolicyKit-style authentication,
4241 * where we accept a message, then determine we need to interactively authenticate the user, and then
4242 * we want to process the message again. */
4243
4244 r = bus_rqueue_make_room(bus);
4245 if (r < 0)
4246 return r;
4247
4248 bus->rqueue[bus->rqueue_size++] = bus_message_ref_queued(m, bus);
4249 return 0;
4250 }
Unnamed repository; edit this file 'description' to name the repository.