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Merge pull request #15321 from topimiettinen/dbus-execute-add-protect-clock
[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 Iterator i;
601 usec_t n;
602 int r;
603
604 assert(bus);
605 assert(bus->state < BUS_HELLO);
606
607 /* We start all method call timeouts when we enter BUS_HELLO or BUS_RUNNING mode. At this point let's convert
608 * all relative to absolute timestamps. Note that we do not reshuffle the reply callback priority queue since
609 * adding a fixed value to all entries should not alter the internal order. */
610
611 n = now(CLOCK_MONOTONIC);
612 ORDERED_HASHMAP_FOREACH(c, bus->reply_callbacks, i) {
613 if (c->timeout_usec == 0)
614 continue;
615
616 c->timeout_usec = usec_add(n, c->timeout_usec);
617 }
618
619 if (bus->bus_client) {
620 bus_set_state(bus, BUS_HELLO);
621 return 1;
622 }
623
624 bus_set_state(bus, BUS_RUNNING);
625
626 r = synthesize_connected_signal(bus);
627 if (r < 0)
628 return r;
629
630 return 1;
631 }
632
633 static int parse_address_key(const char **p, const char *key, char **value) {
634 size_t l, n = 0, allocated = 0;
635 _cleanup_free_ char *r = NULL;
636 const char *a;
637
638 assert(p);
639 assert(*p);
640 assert(value);
641
642 if (key) {
643 l = strlen(key);
644 if (strncmp(*p, key, l) != 0)
645 return 0;
646
647 if ((*p)[l] != '=')
648 return 0;
649
650 if (*value)
651 return -EINVAL;
652
653 a = *p + l + 1;
654 } else
655 a = *p;
656
657 while (!IN_SET(*a, ';', ',', 0)) {
658 char c;
659
660 if (*a == '%') {
661 int x, y;
662
663 x = unhexchar(a[1]);
664 if (x < 0)
665 return x;
666
667 y = unhexchar(a[2]);
668 if (y < 0)
669 return y;
670
671 c = (char) ((x << 4) | y);
672 a += 3;
673 } else {
674 c = *a;
675 a++;
676 }
677
678 if (!GREEDY_REALLOC(r, allocated, n + 2))
679 return -ENOMEM;
680
681 r[n++] = c;
682 }
683
684 if (!r) {
685 r = strdup("");
686 if (!r)
687 return -ENOMEM;
688 } else
689 r[n] = 0;
690
691 if (*a == ',')
692 a++;
693
694 *p = a;
695
696 free_and_replace(*value, r);
697
698 return 1;
699 }
700
701 static void skip_address_key(const char **p) {
702 assert(p);
703 assert(*p);
704
705 *p += strcspn(*p, ",");
706
707 if (**p == ',')
708 (*p)++;
709 }
710
711 static int parse_unix_address(sd_bus *b, const char **p, char **guid) {
712 _cleanup_free_ char *path = NULL, *abstract = NULL;
713 size_t l;
714 int r;
715
716 assert(b);
717 assert(p);
718 assert(*p);
719 assert(guid);
720
721 while (!IN_SET(**p, 0, ';')) {
722 r = parse_address_key(p, "guid", guid);
723 if (r < 0)
724 return r;
725 else if (r > 0)
726 continue;
727
728 r = parse_address_key(p, "path", &path);
729 if (r < 0)
730 return r;
731 else if (r > 0)
732 continue;
733
734 r = parse_address_key(p, "abstract", &abstract);
735 if (r < 0)
736 return r;
737 else if (r > 0)
738 continue;
739
740 skip_address_key(p);
741 }
742
743 if (!path && !abstract)
744 return -EINVAL;
745
746 if (path && abstract)
747 return -EINVAL;
748
749 if (path) {
750 l = strlen(path);
751 if (l >= sizeof(b->sockaddr.un.sun_path)) /* We insist on NUL termination */
752 return -E2BIG;
753
754 b->sockaddr.un = (struct sockaddr_un) {
755 .sun_family = AF_UNIX,
756 };
757
758 memcpy(b->sockaddr.un.sun_path, path, l);
759 b->sockaddr_size = offsetof(struct sockaddr_un, sun_path) + l + 1;
760
761 } else {
762 assert(abstract);
763
764 l = strlen(abstract);
765 if (l >= sizeof(b->sockaddr.un.sun_path) - 1) /* We insist on NUL termination */
766 return -E2BIG;
767
768 b->sockaddr.un = (struct sockaddr_un) {
769 .sun_family = AF_UNIX,
770 };
771
772 memcpy(b->sockaddr.un.sun_path+1, abstract, l);
773 b->sockaddr_size = offsetof(struct sockaddr_un, sun_path) + 1 + l;
774 }
775
776 b->is_local = true;
777
778 return 0;
779 }
780
781 static int parse_tcp_address(sd_bus *b, const char **p, char **guid) {
782 _cleanup_free_ char *host = NULL, *port = NULL, *family = NULL;
783 int r;
784 struct addrinfo *result, hints = {
785 .ai_socktype = SOCK_STREAM,
786 .ai_flags = AI_ADDRCONFIG,
787 };
788
789 assert(b);
790 assert(p);
791 assert(*p);
792 assert(guid);
793
794 while (!IN_SET(**p, 0, ';')) {
795 r = parse_address_key(p, "guid", guid);
796 if (r < 0)
797 return r;
798 else if (r > 0)
799 continue;
800
801 r = parse_address_key(p, "host", &host);
802 if (r < 0)
803 return r;
804 else if (r > 0)
805 continue;
806
807 r = parse_address_key(p, "port", &port);
808 if (r < 0)
809 return r;
810 else if (r > 0)
811 continue;
812
813 r = parse_address_key(p, "family", &family);
814 if (r < 0)
815 return r;
816 else if (r > 0)
817 continue;
818
819 skip_address_key(p);
820 }
821
822 if (!host || !port)
823 return -EINVAL;
824
825 if (family) {
826 if (streq(family, "ipv4"))
827 hints.ai_family = AF_INET;
828 else if (streq(family, "ipv6"))
829 hints.ai_family = AF_INET6;
830 else
831 return -EINVAL;
832 }
833
834 r = getaddrinfo(host, port, &hints, &result);
835 if (r == EAI_SYSTEM)
836 return -errno;
837 else if (r != 0)
838 return -EADDRNOTAVAIL;
839
840 memcpy(&b->sockaddr, result->ai_addr, result->ai_addrlen);
841 b->sockaddr_size = result->ai_addrlen;
842
843 freeaddrinfo(result);
844
845 b->is_local = false;
846
847 return 0;
848 }
849
850 static int parse_exec_address(sd_bus *b, const char **p, char **guid) {
851 char *path = NULL;
852 unsigned n_argv = 0, j;
853 char **argv = NULL;
854 size_t allocated = 0;
855 int r;
856
857 assert(b);
858 assert(p);
859 assert(*p);
860 assert(guid);
861
862 while (!IN_SET(**p, 0, ';')) {
863 r = parse_address_key(p, "guid", guid);
864 if (r < 0)
865 goto fail;
866 else if (r > 0)
867 continue;
868
869 r = parse_address_key(p, "path", &path);
870 if (r < 0)
871 goto fail;
872 else if (r > 0)
873 continue;
874
875 if (startswith(*p, "argv")) {
876 unsigned ul;
877
878 errno = 0;
879 ul = strtoul(*p + 4, (char**) p, 10);
880 if (errno > 0 || **p != '=' || ul > 256) {
881 r = -EINVAL;
882 goto fail;
883 }
884
885 (*p)++;
886
887 if (ul >= n_argv) {
888 if (!GREEDY_REALLOC0(argv, allocated, ul + 2)) {
889 r = -ENOMEM;
890 goto fail;
891 }
892
893 n_argv = ul + 1;
894 }
895
896 r = parse_address_key(p, NULL, argv + ul);
897 if (r < 0)
898 goto fail;
899
900 continue;
901 }
902
903 skip_address_key(p);
904 }
905
906 if (!path) {
907 r = -EINVAL;
908 goto fail;
909 }
910
911 /* Make sure there are no holes in the array, with the
912 * exception of argv[0] */
913 for (j = 1; j < n_argv; j++)
914 if (!argv[j]) {
915 r = -EINVAL;
916 goto fail;
917 }
918
919 if (argv && argv[0] == NULL) {
920 argv[0] = strdup(path);
921 if (!argv[0]) {
922 r = -ENOMEM;
923 goto fail;
924 }
925 }
926
927 b->exec_path = path;
928 b->exec_argv = argv;
929
930 b->is_local = false;
931
932 return 0;
933
934 fail:
935 for (j = 0; j < n_argv; j++)
936 free(argv[j]);
937
938 free(argv);
939 free(path);
940 return r;
941 }
942
943 static int parse_container_unix_address(sd_bus *b, const char **p, char **guid) {
944 _cleanup_free_ char *machine = NULL, *pid = NULL;
945 int r;
946
947 assert(b);
948 assert(p);
949 assert(*p);
950 assert(guid);
951
952 while (!IN_SET(**p, 0, ';')) {
953 r = parse_address_key(p, "guid", guid);
954 if (r < 0)
955 return r;
956 else if (r > 0)
957 continue;
958
959 r = parse_address_key(p, "machine", &machine);
960 if (r < 0)
961 return r;
962 else if (r > 0)
963 continue;
964
965 r = parse_address_key(p, "pid", &pid);
966 if (r < 0)
967 return r;
968 else if (r > 0)
969 continue;
970
971 skip_address_key(p);
972 }
973
974 if (!machine == !pid)
975 return -EINVAL;
976
977 if (machine) {
978 if (!streq(machine, ".host") && !machine_name_is_valid(machine))
979 return -EINVAL;
980
981 free_and_replace(b->machine, machine);
982 } else
983 b->machine = mfree(b->machine);
984
985 if (pid) {
986 r = parse_pid(pid, &b->nspid);
987 if (r < 0)
988 return r;
989 } else
990 b->nspid = 0;
991
992 b->sockaddr.un = (struct sockaddr_un) {
993 .sun_family = AF_UNIX,
994 /* Note that we use the old /var/run prefix here, to increase compatibility with really old containers */
995 .sun_path = "/var/run/dbus/system_bus_socket",
996 };
997 b->sockaddr_size = SOCKADDR_UN_LEN(b->sockaddr.un);
998 b->is_local = false;
999
1000 return 0;
1001 }
1002
1003 static void bus_reset_parsed_address(sd_bus *b) {
1004 assert(b);
1005
1006 zero(b->sockaddr);
1007 b->sockaddr_size = 0;
1008 b->exec_argv = strv_free(b->exec_argv);
1009 b->exec_path = mfree(b->exec_path);
1010 b->server_id = SD_ID128_NULL;
1011 b->machine = mfree(b->machine);
1012 b->nspid = 0;
1013 }
1014
1015 static int bus_parse_next_address(sd_bus *b) {
1016 _cleanup_free_ char *guid = NULL;
1017 const char *a;
1018 int r;
1019
1020 assert(b);
1021
1022 if (!b->address)
1023 return 0;
1024 if (b->address[b->address_index] == 0)
1025 return 0;
1026
1027 bus_reset_parsed_address(b);
1028
1029 a = b->address + b->address_index;
1030
1031 while (*a != 0) {
1032
1033 if (*a == ';') {
1034 a++;
1035 continue;
1036 }
1037
1038 if (startswith(a, "unix:")) {
1039 a += 5;
1040
1041 r = parse_unix_address(b, &a, &guid);
1042 if (r < 0)
1043 return r;
1044 break;
1045
1046 } else if (startswith(a, "tcp:")) {
1047
1048 a += 4;
1049 r = parse_tcp_address(b, &a, &guid);
1050 if (r < 0)
1051 return r;
1052
1053 break;
1054
1055 } else if (startswith(a, "unixexec:")) {
1056
1057 a += 9;
1058 r = parse_exec_address(b, &a, &guid);
1059 if (r < 0)
1060 return r;
1061
1062 break;
1063
1064 } else if (startswith(a, "x-machine-unix:")) {
1065
1066 a += 15;
1067 r = parse_container_unix_address(b, &a, &guid);
1068 if (r < 0)
1069 return r;
1070
1071 break;
1072 }
1073
1074 a = strchr(a, ';');
1075 if (!a)
1076 return 0;
1077 }
1078
1079 if (guid) {
1080 r = sd_id128_from_string(guid, &b->server_id);
1081 if (r < 0)
1082 return r;
1083 }
1084
1085 b->address_index = a - b->address;
1086 return 1;
1087 }
1088
1089 static void bus_kill_exec(sd_bus *bus) {
1090 if (pid_is_valid(bus->busexec_pid) > 0) {
1091 sigterm_wait(bus->busexec_pid);
1092 bus->busexec_pid = 0;
1093 }
1094 }
1095
1096 static int bus_start_address(sd_bus *b) {
1097 int r;
1098
1099 assert(b);
1100
1101 for (;;) {
1102 bus_close_io_fds(b);
1103 bus_close_inotify_fd(b);
1104
1105 bus_kill_exec(b);
1106
1107 /* If you provide multiple different bus-addresses, we
1108 * try all of them in order and use the first one that
1109 * succeeds. */
1110
1111 if (b->exec_path)
1112 r = bus_socket_exec(b);
1113 else if ((b->nspid > 0 || b->machine) && b->sockaddr.sa.sa_family != AF_UNSPEC)
1114 r = bus_container_connect_socket(b);
1115 else if (b->sockaddr.sa.sa_family != AF_UNSPEC)
1116 r = bus_socket_connect(b);
1117 else
1118 goto next;
1119
1120 if (r >= 0) {
1121 int q;
1122
1123 q = bus_attach_io_events(b);
1124 if (q < 0)
1125 return q;
1126
1127 q = bus_attach_inotify_event(b);
1128 if (q < 0)
1129 return q;
1130
1131 return r;
1132 }
1133
1134 b->last_connect_error = -r;
1135
1136 next:
1137 r = bus_parse_next_address(b);
1138 if (r < 0)
1139 return r;
1140 if (r == 0)
1141 return b->last_connect_error > 0 ? -b->last_connect_error : -ECONNREFUSED;
1142 }
1143 }
1144
1145 int bus_next_address(sd_bus *b) {
1146 assert(b);
1147
1148 bus_reset_parsed_address(b);
1149 return bus_start_address(b);
1150 }
1151
1152 static int bus_start_fd(sd_bus *b) {
1153 struct stat st;
1154 int r;
1155
1156 assert(b);
1157 assert(b->input_fd >= 0);
1158 assert(b->output_fd >= 0);
1159
1160 r = fd_nonblock(b->input_fd, true);
1161 if (r < 0)
1162 return r;
1163
1164 r = fd_cloexec(b->input_fd, true);
1165 if (r < 0)
1166 return r;
1167
1168 if (b->input_fd != b->output_fd) {
1169 r = fd_nonblock(b->output_fd, true);
1170 if (r < 0)
1171 return r;
1172
1173 r = fd_cloexec(b->output_fd, true);
1174 if (r < 0)
1175 return r;
1176 }
1177
1178 if (fstat(b->input_fd, &st) < 0)
1179 return -errno;
1180
1181 return bus_socket_take_fd(b);
1182 }
1183
1184 _public_ int sd_bus_start(sd_bus *bus) {
1185 int r;
1186
1187 assert_return(bus, -EINVAL);
1188 assert_return(bus = bus_resolve(bus), -ENOPKG);
1189 assert_return(bus->state == BUS_UNSET, -EPERM);
1190 assert_return(!bus_pid_changed(bus), -ECHILD);
1191
1192 bus_set_state(bus, BUS_OPENING);
1193
1194 if (bus->is_server && bus->bus_client)
1195 return -EINVAL;
1196
1197 if (bus->input_fd >= 0)
1198 r = bus_start_fd(bus);
1199 else if (bus->address || bus->sockaddr.sa.sa_family != AF_UNSPEC || bus->exec_path || bus->machine)
1200 r = bus_start_address(bus);
1201 else
1202 return -EINVAL;
1203
1204 if (r < 0) {
1205 sd_bus_close(bus);
1206 return r;
1207 }
1208
1209 return bus_send_hello(bus);
1210 }
1211
1212 _public_ int sd_bus_open_with_description(sd_bus **ret, const char *description) {
1213 const char *e;
1214 _cleanup_(bus_freep) sd_bus *b = NULL;
1215 int r;
1216
1217 assert_return(ret, -EINVAL);
1218
1219 /* Let's connect to the starter bus if it is set, and
1220 * otherwise to the bus that is appropriate for the scope
1221 * we are running in */
1222
1223 e = secure_getenv("DBUS_STARTER_BUS_TYPE");
1224 if (e) {
1225 if (streq(e, "system"))
1226 return sd_bus_open_system_with_description(ret, description);
1227 else if (STR_IN_SET(e, "session", "user"))
1228 return sd_bus_open_user_with_description(ret, description);
1229 }
1230
1231 e = secure_getenv("DBUS_STARTER_ADDRESS");
1232 if (!e) {
1233 if (cg_pid_get_owner_uid(0, NULL) >= 0)
1234 return sd_bus_open_user_with_description(ret, description);
1235 else
1236 return sd_bus_open_system_with_description(ret, description);
1237 }
1238
1239 r = sd_bus_new(&b);
1240 if (r < 0)
1241 return r;
1242
1243 r = sd_bus_set_address(b, e);
1244 if (r < 0)
1245 return r;
1246
1247 b->bus_client = true;
1248
1249 /* We don't know whether the bus is trusted or not, so better
1250 * be safe, and authenticate everything */
1251 b->trusted = false;
1252 b->is_local = false;
1253 b->creds_mask |= SD_BUS_CREDS_UID | SD_BUS_CREDS_EUID | SD_BUS_CREDS_EFFECTIVE_CAPS;
1254
1255 r = sd_bus_start(b);
1256 if (r < 0)
1257 return r;
1258
1259 *ret = TAKE_PTR(b);
1260 return 0;
1261 }
1262
1263 _public_ int sd_bus_open(sd_bus **ret) {
1264 return sd_bus_open_with_description(ret, NULL);
1265 }
1266
1267 int bus_set_address_system(sd_bus *b) {
1268 const char *e;
1269 assert(b);
1270
1271 e = secure_getenv("DBUS_SYSTEM_BUS_ADDRESS");
1272 return sd_bus_set_address(b, e ?: DEFAULT_SYSTEM_BUS_ADDRESS);
1273 }
1274
1275 _public_ int sd_bus_open_system_with_description(sd_bus **ret, const char *description) {
1276 _cleanup_(bus_freep) sd_bus *b = NULL;
1277 int r;
1278
1279 assert_return(ret, -EINVAL);
1280
1281 r = sd_bus_new(&b);
1282 if (r < 0)
1283 return r;
1284
1285 if (description) {
1286 r = sd_bus_set_description(b, description);
1287 if (r < 0)
1288 return r;
1289 }
1290
1291 r = bus_set_address_system(b);
1292 if (r < 0)
1293 return r;
1294
1295 b->bus_client = true;
1296 b->is_system = true;
1297
1298 /* Let's do per-method access control on the system bus. We
1299 * need the caller's UID and capability set for that. */
1300 b->trusted = false;
1301 b->creds_mask |= SD_BUS_CREDS_UID | SD_BUS_CREDS_EUID | SD_BUS_CREDS_EFFECTIVE_CAPS;
1302 b->is_local = true;
1303
1304 r = sd_bus_start(b);
1305 if (r < 0)
1306 return r;
1307
1308 *ret = TAKE_PTR(b);
1309 return 0;
1310 }
1311
1312 _public_ int sd_bus_open_system(sd_bus **ret) {
1313 return sd_bus_open_system_with_description(ret, NULL);
1314 }
1315
1316 int bus_set_address_user(sd_bus *b) {
1317 const char *a;
1318 _cleanup_free_ char *_a = NULL;
1319
1320 assert(b);
1321
1322 a = secure_getenv("DBUS_SESSION_BUS_ADDRESS");
1323 if (!a) {
1324 const char *e;
1325 _cleanup_free_ char *ee = NULL;
1326
1327 e = secure_getenv("XDG_RUNTIME_DIR");
1328 if (!e)
1329 return -ENOENT;
1330
1331 ee = bus_address_escape(e);
1332 if (!ee)
1333 return -ENOMEM;
1334
1335 if (asprintf(&_a, DEFAULT_USER_BUS_ADDRESS_FMT, ee) < 0)
1336 return -ENOMEM;
1337 a = _a;
1338 }
1339
1340 return sd_bus_set_address(b, a);
1341 }
1342
1343 _public_ int sd_bus_open_user_with_description(sd_bus **ret, const char *description) {
1344 _cleanup_(bus_freep) sd_bus *b = NULL;
1345 int r;
1346
1347 assert_return(ret, -EINVAL);
1348
1349 r = sd_bus_new(&b);
1350 if (r < 0)
1351 return r;
1352
1353 if (description) {
1354 r = sd_bus_set_description(b, description);
1355 if (r < 0)
1356 return r;
1357 }
1358
1359 r = bus_set_address_user(b);
1360 if (r < 0)
1361 return r;
1362
1363 b->bus_client = true;
1364 b->is_user = true;
1365
1366 /* We don't do any per-method access control on the user bus. */
1367 b->trusted = true;
1368 b->is_local = true;
1369
1370 r = sd_bus_start(b);
1371 if (r < 0)
1372 return r;
1373
1374 *ret = TAKE_PTR(b);
1375 return 0;
1376 }
1377
1378 _public_ int sd_bus_open_user(sd_bus **ret) {
1379 return sd_bus_open_user_with_description(ret, NULL);
1380 }
1381
1382 int bus_set_address_system_remote(sd_bus *b, const char *host) {
1383 _cleanup_free_ char *e = NULL;
1384 char *m = NULL, *c = NULL, *a, *rbracket = NULL, *p = NULL;
1385
1386 assert(b);
1387 assert(host);
1388
1389 /* Skip ":"s in ipv6 addresses */
1390 if (*host == '[') {
1391 char *t;
1392
1393 rbracket = strchr(host, ']');
1394 if (!rbracket)
1395 return -EINVAL;
1396 t = strndupa(host + 1, rbracket - host - 1);
1397 e = bus_address_escape(t);
1398 if (!e)
1399 return -ENOMEM;
1400 } else if ((a = strchr(host, '@'))) {
1401 if (*(a + 1) == '[') {
1402 _cleanup_free_ char *t = NULL;
1403
1404 rbracket = strchr(a + 1, ']');
1405 if (!rbracket)
1406 return -EINVAL;
1407 t = new0(char, strlen(host));
1408 if (!t)
1409 return -ENOMEM;
1410 strncat(t, host, a - host + 1);
1411 strncat(t, a + 2, rbracket - a - 2);
1412 e = bus_address_escape(t);
1413 if (!e)
1414 return -ENOMEM;
1415 } else if (*(a + 1) == '\0' || strchr(a + 1, '@'))
1416 return -EINVAL;
1417 }
1418
1419 /* Let's see if a port was given */
1420 m = strchr(rbracket ? rbracket + 1 : host, ':');
1421 if (m) {
1422 char *t;
1423 bool got_forward_slash = false;
1424
1425 p = m + 1;
1426
1427 t = strchr(p, '/');
1428 if (t) {
1429 p = strndupa(p, t - p);
1430 got_forward_slash = true;
1431 }
1432
1433 if (!in_charset(p, "0123456789") || *p == '\0') {
1434 if (!machine_name_is_valid(p) || got_forward_slash)
1435 return -EINVAL;
1436
1437 m = TAKE_PTR(p);
1438 goto interpret_port_as_machine_old_syntax;
1439 }
1440 }
1441
1442 /* Let's see if a machine was given */
1443 m = strchr(rbracket ? rbracket + 1 : host, '/');
1444 if (m) {
1445 m++;
1446 interpret_port_as_machine_old_syntax:
1447 /* Let's make sure this is not a port of some kind,
1448 * and is a valid machine name. */
1449 if (!in_charset(m, "0123456789") && machine_name_is_valid(m))
1450 c = strjoina(",argv", p ? "7" : "5", "=--machine=", m);
1451 }
1452
1453 if (!e) {
1454 char *t;
1455
1456 t = strndupa(host, strcspn(host, ":/"));
1457
1458 e = bus_address_escape(t);
1459 if (!e)
1460 return -ENOMEM;
1461 }
1462
1463 a = strjoin("unixexec:path=ssh,argv1=-xT", p ? ",argv2=-p,argv3=" : "", strempty(p),
1464 ",argv", p ? "4" : "2", "=--,argv", p ? "5" : "3", "=", e,
1465 ",argv", p ? "6" : "4", "=systemd-stdio-bridge", c);
1466 if (!a)
1467 return -ENOMEM;
1468
1469 return free_and_replace(b->address, a);
1470 }
1471
1472 _public_ int sd_bus_open_system_remote(sd_bus **ret, const char *host) {
1473 _cleanup_(bus_freep) sd_bus *b = NULL;
1474 int r;
1475
1476 assert_return(host, -EINVAL);
1477 assert_return(ret, -EINVAL);
1478
1479 r = sd_bus_new(&b);
1480 if (r < 0)
1481 return r;
1482
1483 r = bus_set_address_system_remote(b, host);
1484 if (r < 0)
1485 return r;
1486
1487 b->bus_client = true;
1488 b->trusted = false;
1489 b->is_system = true;
1490 b->is_local = false;
1491
1492 r = sd_bus_start(b);
1493 if (r < 0)
1494 return r;
1495
1496 *ret = TAKE_PTR(b);
1497 return 0;
1498 }
1499
1500 int bus_set_address_system_machine(sd_bus *b, const char *machine) {
1501 _cleanup_free_ char *e = NULL;
1502 char *a;
1503
1504 assert(b);
1505 assert(machine);
1506
1507 e = bus_address_escape(machine);
1508 if (!e)
1509 return -ENOMEM;
1510
1511 a = strjoin("x-machine-unix:machine=", e);
1512 if (!a)
1513 return -ENOMEM;
1514
1515 return free_and_replace(b->address, a);
1516 }
1517
1518 _public_ int sd_bus_open_system_machine(sd_bus **ret, const char *machine) {
1519 _cleanup_(bus_freep) sd_bus *b = NULL;
1520 int r;
1521
1522 assert_return(machine, -EINVAL);
1523 assert_return(ret, -EINVAL);
1524 assert_return(streq(machine, ".host") || machine_name_is_valid(machine), -EINVAL);
1525
1526 r = sd_bus_new(&b);
1527 if (r < 0)
1528 return r;
1529
1530 r = bus_set_address_system_machine(b, machine);
1531 if (r < 0)
1532 return r;
1533
1534 b->bus_client = true;
1535 b->trusted = false;
1536 b->is_system = true;
1537 b->is_local = false;
1538
1539 r = sd_bus_start(b);
1540 if (r < 0)
1541 return r;
1542
1543 *ret = TAKE_PTR(b);
1544 return 0;
1545 }
1546
1547 _public_ void sd_bus_close(sd_bus *bus) {
1548 if (!bus)
1549 return;
1550 if (bus->state == BUS_CLOSED)
1551 return;
1552 if (bus_pid_changed(bus))
1553 return;
1554
1555 /* Don't leave ssh hanging around */
1556 bus_kill_exec(bus);
1557
1558 bus_set_state(bus, BUS_CLOSED);
1559
1560 sd_bus_detach_event(bus);
1561
1562 /* Drop all queued messages so that they drop references to
1563 * the bus object and the bus may be freed */
1564 bus_reset_queues(bus);
1565
1566 bus_close_io_fds(bus);
1567 bus_close_inotify_fd(bus);
1568 }
1569
1570 _public_ sd_bus *sd_bus_close_unref(sd_bus *bus) {
1571 if (!bus)
1572 return NULL;
1573
1574 sd_bus_close(bus);
1575
1576 return sd_bus_unref(bus);
1577 }
1578
1579 _public_ sd_bus* sd_bus_flush_close_unref(sd_bus *bus) {
1580 if (!bus)
1581 return NULL;
1582
1583 /* Have to do this before flush() to prevent hang */
1584 bus_kill_exec(bus);
1585 sd_bus_flush(bus);
1586
1587 return sd_bus_close_unref(bus);
1588 }
1589
1590 void bus_enter_closing(sd_bus *bus) {
1591 assert(bus);
1592
1593 if (!IN_SET(bus->state, BUS_WATCH_BIND, BUS_OPENING, BUS_AUTHENTICATING, BUS_HELLO, BUS_RUNNING))
1594 return;
1595
1596 bus_set_state(bus, BUS_CLOSING);
1597 }
1598
1599 DEFINE_PUBLIC_TRIVIAL_REF_UNREF_FUNC(sd_bus, sd_bus, bus_free);
1600
1601 _public_ int sd_bus_is_open(sd_bus *bus) {
1602 assert_return(bus, -EINVAL);
1603 assert_return(bus = bus_resolve(bus), -ENOPKG);
1604 assert_return(!bus_pid_changed(bus), -ECHILD);
1605
1606 return BUS_IS_OPEN(bus->state);
1607 }
1608
1609 _public_ int sd_bus_is_ready(sd_bus *bus) {
1610 assert_return(bus, -EINVAL);
1611 assert_return(bus = bus_resolve(bus), -ENOPKG);
1612 assert_return(!bus_pid_changed(bus), -ECHILD);
1613
1614 return bus->state == BUS_RUNNING;
1615 }
1616
1617 _public_ int sd_bus_can_send(sd_bus *bus, char type) {
1618 int r;
1619
1620 assert_return(bus, -EINVAL);
1621 assert_return(bus = bus_resolve(bus), -ENOPKG);
1622 assert_return(bus->state != BUS_UNSET, -ENOTCONN);
1623 assert_return(!bus_pid_changed(bus), -ECHILD);
1624
1625 if (bus->is_monitor)
1626 return 0;
1627
1628 if (type == SD_BUS_TYPE_UNIX_FD) {
1629 if (!bus->accept_fd)
1630 return 0;
1631
1632 r = bus_ensure_running(bus);
1633 if (r < 0)
1634 return r;
1635
1636 return bus->can_fds;
1637 }
1638
1639 return bus_type_is_valid(type);
1640 }
1641
1642 _public_ int sd_bus_get_bus_id(sd_bus *bus, sd_id128_t *id) {
1643 int r;
1644
1645 assert_return(bus, -EINVAL);
1646 assert_return(bus = bus_resolve(bus), -ENOPKG);
1647 assert_return(id, -EINVAL);
1648 assert_return(!bus_pid_changed(bus), -ECHILD);
1649
1650 r = bus_ensure_running(bus);
1651 if (r < 0)
1652 return r;
1653
1654 *id = bus->server_id;
1655 return 0;
1656 }
1657
1658 #define COOKIE_CYCLED (UINT32_C(1) << 31)
1659
1660 static uint64_t cookie_inc(uint64_t cookie) {
1661
1662 /* Stay within the 32bit range, since classic D-Bus can't deal with more */
1663 if (cookie >= UINT32_MAX)
1664 return COOKIE_CYCLED; /* Don't go back to zero, but use the highest bit for checking
1665 * whether we are looping. */
1666
1667 return cookie + 1;
1668 }
1669
1670 static int next_cookie(sd_bus *b) {
1671 uint64_t new_cookie;
1672
1673 assert(b);
1674
1675 new_cookie = cookie_inc(b->cookie);
1676
1677 /* Small optimization: don't bother with checking for cookie reuse until we overran cookiespace at
1678 * least once, but then do it thorougly. */
1679 if (FLAGS_SET(new_cookie, COOKIE_CYCLED)) {
1680 uint32_t i;
1681
1682 /* Check if the cookie is currently in use. If so, pick the next one */
1683 for (i = 0; i < COOKIE_CYCLED; i++) {
1684 if (!ordered_hashmap_contains(b->reply_callbacks, &new_cookie))
1685 goto good;
1686
1687 new_cookie = cookie_inc(new_cookie);
1688 }
1689
1690 /* Can't fulfill request */
1691 return -EBUSY;
1692 }
1693
1694 good:
1695 b->cookie = new_cookie;
1696 return 0;
1697 }
1698
1699 static int bus_seal_message(sd_bus *b, sd_bus_message *m, usec_t timeout) {
1700 int r;
1701
1702 assert(b);
1703 assert(m);
1704
1705 if (m->sealed) {
1706 /* If we copy the same message to multiple
1707 * destinations, avoid using the same cookie
1708 * numbers. */
1709 b->cookie = MAX(b->cookie, BUS_MESSAGE_COOKIE(m));
1710 return 0;
1711 }
1712
1713 if (timeout == 0) {
1714 r = sd_bus_get_method_call_timeout(b, &timeout);
1715 if (r < 0)
1716 return r;
1717 }
1718
1719 if (!m->sender && b->patch_sender) {
1720 r = sd_bus_message_set_sender(m, b->patch_sender);
1721 if (r < 0)
1722 return r;
1723 }
1724
1725 r = next_cookie(b);
1726 if (r < 0)
1727 return r;
1728
1729 return sd_bus_message_seal(m, b->cookie, timeout);
1730 }
1731
1732 static int bus_remarshal_message(sd_bus *b, sd_bus_message **m) {
1733 bool remarshal = false;
1734
1735 assert(b);
1736
1737 /* wrong packet version */
1738 if (b->message_version != 0 && b->message_version != (*m)->header->version)
1739 remarshal = true;
1740
1741 /* wrong packet endianness */
1742 if (b->message_endian != 0 && b->message_endian != (*m)->header->endian)
1743 remarshal = true;
1744
1745 return remarshal ? bus_message_remarshal(b, m) : 0;
1746 }
1747
1748 int bus_seal_synthetic_message(sd_bus *b, sd_bus_message *m) {
1749 assert(b);
1750 assert(m);
1751
1752 /* Fake some timestamps, if they were requested, and not
1753 * already initialized */
1754 if (b->attach_timestamp) {
1755 if (m->realtime <= 0)
1756 m->realtime = now(CLOCK_REALTIME);
1757
1758 if (m->monotonic <= 0)
1759 m->monotonic = now(CLOCK_MONOTONIC);
1760 }
1761
1762 /* The bus specification says the serial number cannot be 0,
1763 * hence let's fill something in for synthetic messages. Since
1764 * synthetic messages might have a fake sender and we don't
1765 * want to interfere with the real sender's serial numbers we
1766 * pick a fixed, artificial one. We use (uint32_t) -1 rather
1767 * than (uint64_t) -1 since dbus1 only had 32bit identifiers,
1768 * even though kdbus can do 64bit. */
1769 return sd_bus_message_seal(m, 0xFFFFFFFFULL, 0);
1770 }
1771
1772 static int bus_write_message(sd_bus *bus, sd_bus_message *m, size_t *idx) {
1773 int r;
1774
1775 assert(bus);
1776 assert(m);
1777
1778 r = bus_socket_write_message(bus, m, idx);
1779 if (r <= 0)
1780 return r;
1781
1782 if (*idx >= BUS_MESSAGE_SIZE(m))
1783 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",
1784 bus_message_type_to_string(m->header->type),
1785 strna(sd_bus_message_get_sender(m)),
1786 strna(sd_bus_message_get_destination(m)),
1787 strna(sd_bus_message_get_path(m)),
1788 strna(sd_bus_message_get_interface(m)),
1789 strna(sd_bus_message_get_member(m)),
1790 BUS_MESSAGE_COOKIE(m),
1791 m->reply_cookie,
1792 strna(m->root_container.signature),
1793 strna(m->error.name),
1794 strna(m->error.message));
1795
1796 return r;
1797 }
1798
1799 static int dispatch_wqueue(sd_bus *bus) {
1800 int r, ret = 0;
1801
1802 assert(bus);
1803 assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO));
1804
1805 while (bus->wqueue_size > 0) {
1806
1807 r = bus_write_message(bus, bus->wqueue[0], &bus->windex);
1808 if (r < 0)
1809 return r;
1810 else if (r == 0)
1811 /* Didn't do anything this time */
1812 return ret;
1813 else if (bus->windex >= BUS_MESSAGE_SIZE(bus->wqueue[0])) {
1814 /* Fully written. Let's drop the entry from
1815 * the queue.
1816 *
1817 * This isn't particularly optimized, but
1818 * well, this is supposed to be our worst-case
1819 * buffer only, and the socket buffer is
1820 * supposed to be our primary buffer, and if
1821 * it got full, then all bets are off
1822 * anyway. */
1823
1824 bus->wqueue_size--;
1825 bus_message_unref_queued(bus->wqueue[0], bus);
1826 memmove(bus->wqueue, bus->wqueue + 1, sizeof(sd_bus_message*) * bus->wqueue_size);
1827 bus->windex = 0;
1828
1829 ret = 1;
1830 }
1831 }
1832
1833 return ret;
1834 }
1835
1836 static int bus_read_message(sd_bus *bus) {
1837 assert(bus);
1838
1839 return bus_socket_read_message(bus);
1840 }
1841
1842 int bus_rqueue_make_room(sd_bus *bus) {
1843 assert(bus);
1844
1845 if (bus->rqueue_size >= BUS_RQUEUE_MAX)
1846 return -ENOBUFS;
1847
1848 if (!GREEDY_REALLOC(bus->rqueue, bus->rqueue_allocated, bus->rqueue_size + 1))
1849 return -ENOMEM;
1850
1851 return 0;
1852 }
1853
1854 static void rqueue_drop_one(sd_bus *bus, size_t i) {
1855 assert(bus);
1856 assert(i < bus->rqueue_size);
1857
1858 bus_message_unref_queued(bus->rqueue[i], bus);
1859 memmove(bus->rqueue + i, bus->rqueue + i + 1, sizeof(sd_bus_message*) * (bus->rqueue_size - i - 1));
1860 bus->rqueue_size--;
1861 }
1862
1863 static int dispatch_rqueue(sd_bus *bus, sd_bus_message **m) {
1864 int r, ret = 0;
1865
1866 assert(bus);
1867 assert(m);
1868 assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO));
1869
1870 for (;;) {
1871 if (bus->rqueue_size > 0) {
1872 /* Dispatch a queued message */
1873 *m = sd_bus_message_ref(bus->rqueue[0]);
1874 rqueue_drop_one(bus, 0);
1875 return 1;
1876 }
1877
1878 /* Try to read a new message */
1879 r = bus_read_message(bus);
1880 if (r < 0)
1881 return r;
1882 if (r == 0) {
1883 *m = NULL;
1884 return ret;
1885 }
1886
1887 ret = 1;
1888 }
1889 }
1890
1891 _public_ int sd_bus_send(sd_bus *bus, sd_bus_message *_m, uint64_t *cookie) {
1892 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = sd_bus_message_ref(_m);
1893 int r;
1894
1895 assert_return(m, -EINVAL);
1896
1897 if (bus)
1898 assert_return(bus = bus_resolve(bus), -ENOPKG);
1899 else
1900 assert_return(bus = m->bus, -ENOTCONN);
1901 assert_return(!bus_pid_changed(bus), -ECHILD);
1902
1903 if (!BUS_IS_OPEN(bus->state))
1904 return -ENOTCONN;
1905
1906 if (m->n_fds > 0) {
1907 r = sd_bus_can_send(bus, SD_BUS_TYPE_UNIX_FD);
1908 if (r < 0)
1909 return r;
1910 if (r == 0)
1911 return -EOPNOTSUPP;
1912 }
1913
1914 /* If the cookie number isn't kept, then we know that no reply
1915 * is expected */
1916 if (!cookie && !m->sealed)
1917 m->header->flags |= BUS_MESSAGE_NO_REPLY_EXPECTED;
1918
1919 r = bus_seal_message(bus, m, 0);
1920 if (r < 0)
1921 return r;
1922
1923 /* Remarshall if we have to. This will possibly unref the
1924 * message and place a replacement in m */
1925 r = bus_remarshal_message(bus, &m);
1926 if (r < 0)
1927 return r;
1928
1929 /* If this is a reply and no reply was requested, then let's
1930 * suppress this, if we can */
1931 if (m->dont_send)
1932 goto finish;
1933
1934 if (IN_SET(bus->state, BUS_RUNNING, BUS_HELLO) && bus->wqueue_size <= 0) {
1935 size_t idx = 0;
1936
1937 r = bus_write_message(bus, m, &idx);
1938 if (r < 0) {
1939 if (ERRNO_IS_DISCONNECT(r)) {
1940 bus_enter_closing(bus);
1941 return -ECONNRESET;
1942 }
1943
1944 return r;
1945 }
1946
1947 if (idx < BUS_MESSAGE_SIZE(m)) {
1948 /* Wasn't fully written. So let's remember how
1949 * much was written. Note that the first entry
1950 * of the wqueue array is always allocated so
1951 * that we always can remember how much was
1952 * written. */
1953 bus->wqueue[0] = bus_message_ref_queued(m, bus);
1954 bus->wqueue_size = 1;
1955 bus->windex = idx;
1956 }
1957
1958 } else {
1959 /* Just append it to the queue. */
1960
1961 if (bus->wqueue_size >= BUS_WQUEUE_MAX)
1962 return -ENOBUFS;
1963
1964 if (!GREEDY_REALLOC(bus->wqueue, bus->wqueue_allocated, bus->wqueue_size + 1))
1965 return -ENOMEM;
1966
1967 bus->wqueue[bus->wqueue_size++] = bus_message_ref_queued(m, bus);
1968 }
1969
1970 finish:
1971 if (cookie)
1972 *cookie = BUS_MESSAGE_COOKIE(m);
1973
1974 return 1;
1975 }
1976
1977 _public_ int sd_bus_send_to(sd_bus *bus, sd_bus_message *m, const char *destination, uint64_t *cookie) {
1978 int r;
1979
1980 assert_return(m, -EINVAL);
1981
1982 if (bus)
1983 assert_return(bus = bus_resolve(bus), -ENOPKG);
1984 else
1985 assert_return(bus = m->bus, -ENOTCONN);
1986 assert_return(!bus_pid_changed(bus), -ECHILD);
1987
1988 if (!BUS_IS_OPEN(bus->state))
1989 return -ENOTCONN;
1990
1991 if (!streq_ptr(m->destination, destination)) {
1992
1993 if (!destination)
1994 return -EEXIST;
1995
1996 r = sd_bus_message_set_destination(m, destination);
1997 if (r < 0)
1998 return r;
1999 }
2000
2001 return sd_bus_send(bus, m, cookie);
2002 }
2003
2004 static usec_t calc_elapse(sd_bus *bus, uint64_t usec) {
2005 assert(bus);
2006
2007 if (usec == (uint64_t) -1)
2008 return 0;
2009
2010 /* We start all timeouts the instant we enter BUS_HELLO/BUS_RUNNING state, so that the don't run in parallel
2011 * with any connection setup states. Hence, if a method callback is started earlier than that we just store the
2012 * relative timestamp, and afterwards the absolute one. */
2013
2014 if (IN_SET(bus->state, BUS_WATCH_BIND, BUS_OPENING, BUS_AUTHENTICATING))
2015 return usec;
2016 else
2017 return now(CLOCK_MONOTONIC) + usec;
2018 }
2019
2020 static int timeout_compare(const void *a, const void *b) {
2021 const struct reply_callback *x = a, *y = b;
2022
2023 if (x->timeout_usec != 0 && y->timeout_usec == 0)
2024 return -1;
2025
2026 if (x->timeout_usec == 0 && y->timeout_usec != 0)
2027 return 1;
2028
2029 return CMP(x->timeout_usec, y->timeout_usec);
2030 }
2031
2032 _public_ int sd_bus_call_async(
2033 sd_bus *bus,
2034 sd_bus_slot **slot,
2035 sd_bus_message *_m,
2036 sd_bus_message_handler_t callback,
2037 void *userdata,
2038 uint64_t usec) {
2039
2040 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = sd_bus_message_ref(_m);
2041 _cleanup_(sd_bus_slot_unrefp) sd_bus_slot *s = NULL;
2042 int r;
2043
2044 assert_return(m, -EINVAL);
2045 assert_return(m->header->type == SD_BUS_MESSAGE_METHOD_CALL, -EINVAL);
2046 assert_return(!m->sealed || (!!callback == !(m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED)), -EINVAL);
2047
2048 if (bus)
2049 assert_return(bus = bus_resolve(bus), -ENOPKG);
2050 else
2051 assert_return(bus = m->bus, -ENOTCONN);
2052 assert_return(!bus_pid_changed(bus), -ECHILD);
2053
2054 if (!BUS_IS_OPEN(bus->state))
2055 return -ENOTCONN;
2056
2057 /* If no callback is specified and there's no interest in a slot, then there's no reason to ask for a reply */
2058 if (!callback && !slot && !m->sealed)
2059 m->header->flags |= BUS_MESSAGE_NO_REPLY_EXPECTED;
2060
2061 r = ordered_hashmap_ensure_allocated(&bus->reply_callbacks, &uint64_hash_ops);
2062 if (r < 0)
2063 return r;
2064
2065 r = prioq_ensure_allocated(&bus->reply_callbacks_prioq, timeout_compare);
2066 if (r < 0)
2067 return r;
2068
2069 r = bus_seal_message(bus, m, usec);
2070 if (r < 0)
2071 return r;
2072
2073 r = bus_remarshal_message(bus, &m);
2074 if (r < 0)
2075 return r;
2076
2077 if (slot || callback) {
2078 s = bus_slot_allocate(bus, !slot, BUS_REPLY_CALLBACK, sizeof(struct reply_callback), userdata);
2079 if (!s)
2080 return -ENOMEM;
2081
2082 s->reply_callback.callback = callback;
2083
2084 s->reply_callback.cookie = BUS_MESSAGE_COOKIE(m);
2085 r = ordered_hashmap_put(bus->reply_callbacks, &s->reply_callback.cookie, &s->reply_callback);
2086 if (r < 0) {
2087 s->reply_callback.cookie = 0;
2088 return r;
2089 }
2090
2091 s->reply_callback.timeout_usec = calc_elapse(bus, m->timeout);
2092 if (s->reply_callback.timeout_usec != 0) {
2093 r = prioq_put(bus->reply_callbacks_prioq, &s->reply_callback, &s->reply_callback.prioq_idx);
2094 if (r < 0) {
2095 s->reply_callback.timeout_usec = 0;
2096 return r;
2097 }
2098 }
2099 }
2100
2101 r = sd_bus_send(bus, m, s ? &s->reply_callback.cookie : NULL);
2102 if (r < 0)
2103 return r;
2104
2105 if (slot)
2106 *slot = s;
2107 s = NULL;
2108
2109 return r;
2110 }
2111
2112 int bus_ensure_running(sd_bus *bus) {
2113 int r;
2114
2115 assert(bus);
2116
2117 if (IN_SET(bus->state, BUS_UNSET, BUS_CLOSED, BUS_CLOSING))
2118 return -ENOTCONN;
2119 if (bus->state == BUS_RUNNING)
2120 return 1;
2121
2122 for (;;) {
2123 r = sd_bus_process(bus, NULL);
2124 if (r < 0)
2125 return r;
2126 if (bus->state == BUS_RUNNING)
2127 return 1;
2128 if (r > 0)
2129 continue;
2130
2131 r = sd_bus_wait(bus, (uint64_t) -1);
2132 if (r < 0)
2133 return r;
2134 }
2135 }
2136
2137 _public_ int sd_bus_call(
2138 sd_bus *bus,
2139 sd_bus_message *_m,
2140 uint64_t usec,
2141 sd_bus_error *error,
2142 sd_bus_message **reply) {
2143
2144 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = sd_bus_message_ref(_m);
2145 usec_t timeout;
2146 uint64_t cookie;
2147 size_t i;
2148 int r;
2149
2150 bus_assert_return(m, -EINVAL, error);
2151 bus_assert_return(m->header->type == SD_BUS_MESSAGE_METHOD_CALL, -EINVAL, error);
2152 bus_assert_return(!(m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED), -EINVAL, error);
2153 bus_assert_return(!bus_error_is_dirty(error), -EINVAL, error);
2154
2155 if (bus)
2156 assert_return(bus = bus_resolve(bus), -ENOPKG);
2157 else
2158 assert_return(bus = m->bus, -ENOTCONN);
2159 bus_assert_return(!bus_pid_changed(bus), -ECHILD, error);
2160
2161 if (!BUS_IS_OPEN(bus->state)) {
2162 r = -ENOTCONN;
2163 goto fail;
2164 }
2165
2166 r = bus_ensure_running(bus);
2167 if (r < 0)
2168 goto fail;
2169
2170 i = bus->rqueue_size;
2171
2172 r = bus_seal_message(bus, m, usec);
2173 if (r < 0)
2174 goto fail;
2175
2176 r = bus_remarshal_message(bus, &m);
2177 if (r < 0)
2178 goto fail;
2179
2180 r = sd_bus_send(bus, m, &cookie);
2181 if (r < 0)
2182 goto fail;
2183
2184 timeout = calc_elapse(bus, m->timeout);
2185
2186 for (;;) {
2187 usec_t left;
2188
2189 while (i < bus->rqueue_size) {
2190 _cleanup_(sd_bus_message_unrefp) sd_bus_message *incoming = NULL;
2191
2192 incoming = sd_bus_message_ref(bus->rqueue[i]);
2193
2194 if (incoming->reply_cookie == cookie) {
2195 /* Found a match! */
2196
2197 rqueue_drop_one(bus, i);
2198 log_debug_bus_message(incoming);
2199
2200 if (incoming->header->type == SD_BUS_MESSAGE_METHOD_RETURN) {
2201
2202 if (incoming->n_fds <= 0 || bus->accept_fd) {
2203 if (reply)
2204 *reply = TAKE_PTR(incoming);
2205
2206 return 1;
2207 }
2208
2209 return sd_bus_error_setf(error, SD_BUS_ERROR_INCONSISTENT_MESSAGE, "Reply message contained file descriptors which I couldn't accept. Sorry.");
2210
2211 } else if (incoming->header->type == SD_BUS_MESSAGE_METHOD_ERROR)
2212 return sd_bus_error_copy(error, &incoming->error);
2213 else {
2214 r = -EIO;
2215 goto fail;
2216 }
2217
2218 } else if (BUS_MESSAGE_COOKIE(incoming) == cookie &&
2219 bus->unique_name &&
2220 incoming->sender &&
2221 streq(bus->unique_name, incoming->sender)) {
2222
2223 rqueue_drop_one(bus, i);
2224
2225 /* Our own message? Somebody is trying to send its own client a message,
2226 * let's not dead-lock, let's fail immediately. */
2227
2228 r = -ELOOP;
2229 goto fail;
2230 }
2231
2232 /* Try to read more, right-away */
2233 i++;
2234 }
2235
2236 r = bus_read_message(bus);
2237 if (r < 0) {
2238 if (ERRNO_IS_DISCONNECT(r)) {
2239 bus_enter_closing(bus);
2240 r = -ECONNRESET;
2241 }
2242
2243 goto fail;
2244 }
2245 if (r > 0)
2246 continue;
2247
2248 if (timeout > 0) {
2249 usec_t n;
2250
2251 n = now(CLOCK_MONOTONIC);
2252 if (n >= timeout) {
2253 r = -ETIMEDOUT;
2254 goto fail;
2255 }
2256
2257 left = timeout - n;
2258 } else
2259 left = (uint64_t) -1;
2260
2261 r = bus_poll(bus, true, left);
2262 if (r < 0)
2263 goto fail;
2264 if (r == 0) {
2265 r = -ETIMEDOUT;
2266 goto fail;
2267 }
2268
2269 r = dispatch_wqueue(bus);
2270 if (r < 0) {
2271 if (ERRNO_IS_DISCONNECT(r)) {
2272 bus_enter_closing(bus);
2273 r = -ECONNRESET;
2274 }
2275
2276 goto fail;
2277 }
2278 }
2279
2280 fail:
2281 return sd_bus_error_set_errno(error, r);
2282 }
2283
2284 _public_ int sd_bus_get_fd(sd_bus *bus) {
2285 assert_return(bus, -EINVAL);
2286 assert_return(bus = bus_resolve(bus), -ENOPKG);
2287 assert_return(bus->input_fd == bus->output_fd, -EPERM);
2288 assert_return(!bus_pid_changed(bus), -ECHILD);
2289
2290 if (bus->state == BUS_CLOSED)
2291 return -ENOTCONN;
2292
2293 if (bus->inotify_fd >= 0)
2294 return bus->inotify_fd;
2295
2296 if (bus->input_fd >= 0)
2297 return bus->input_fd;
2298
2299 return -ENOTCONN;
2300 }
2301
2302 _public_ int sd_bus_get_events(sd_bus *bus) {
2303 int flags = 0;
2304
2305 assert_return(bus, -EINVAL);
2306 assert_return(bus = bus_resolve(bus), -ENOPKG);
2307 assert_return(!bus_pid_changed(bus), -ECHILD);
2308
2309 switch (bus->state) {
2310
2311 case BUS_UNSET:
2312 case BUS_CLOSED:
2313 return -ENOTCONN;
2314
2315 case BUS_WATCH_BIND:
2316 flags |= POLLIN;
2317 break;
2318
2319 case BUS_OPENING:
2320 flags |= POLLOUT;
2321 break;
2322
2323 case BUS_AUTHENTICATING:
2324 if (bus_socket_auth_needs_write(bus))
2325 flags |= POLLOUT;
2326
2327 flags |= POLLIN;
2328 break;
2329
2330 case BUS_RUNNING:
2331 case BUS_HELLO:
2332 if (bus->rqueue_size <= 0)
2333 flags |= POLLIN;
2334 if (bus->wqueue_size > 0)
2335 flags |= POLLOUT;
2336 break;
2337
2338 case BUS_CLOSING:
2339 break;
2340
2341 default:
2342 assert_not_reached("Unknown state");
2343 }
2344
2345 return flags;
2346 }
2347
2348 _public_ int sd_bus_get_timeout(sd_bus *bus, uint64_t *timeout_usec) {
2349 struct reply_callback *c;
2350
2351 assert_return(bus, -EINVAL);
2352 assert_return(bus = bus_resolve(bus), -ENOPKG);
2353 assert_return(timeout_usec, -EINVAL);
2354 assert_return(!bus_pid_changed(bus), -ECHILD);
2355
2356 if (!BUS_IS_OPEN(bus->state) && bus->state != BUS_CLOSING)
2357 return -ENOTCONN;
2358
2359 if (bus->track_queue) {
2360 *timeout_usec = 0;
2361 return 1;
2362 }
2363
2364 switch (bus->state) {
2365
2366 case BUS_AUTHENTICATING:
2367 *timeout_usec = bus->auth_timeout;
2368 return 1;
2369
2370 case BUS_RUNNING:
2371 case BUS_HELLO:
2372 if (bus->rqueue_size > 0) {
2373 *timeout_usec = 0;
2374 return 1;
2375 }
2376
2377 c = prioq_peek(bus->reply_callbacks_prioq);
2378 if (!c) {
2379 *timeout_usec = (uint64_t) -1;
2380 return 0;
2381 }
2382
2383 if (c->timeout_usec == 0) {
2384 *timeout_usec = (uint64_t) -1;
2385 return 0;
2386 }
2387
2388 *timeout_usec = c->timeout_usec;
2389 return 1;
2390
2391 case BUS_CLOSING:
2392 *timeout_usec = 0;
2393 return 1;
2394
2395 case BUS_WATCH_BIND:
2396 case BUS_OPENING:
2397 *timeout_usec = (uint64_t) -1;
2398 return 0;
2399
2400 default:
2401 assert_not_reached("Unknown or unexpected stat");
2402 }
2403 }
2404
2405 static int process_timeout(sd_bus *bus) {
2406 _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
2407 _cleanup_(sd_bus_message_unrefp) sd_bus_message* m = NULL;
2408 struct reply_callback *c;
2409 sd_bus_slot *slot;
2410 bool is_hello;
2411 usec_t n;
2412 int r;
2413
2414 assert(bus);
2415 assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO));
2416
2417 c = prioq_peek(bus->reply_callbacks_prioq);
2418 if (!c)
2419 return 0;
2420
2421 n = now(CLOCK_MONOTONIC);
2422 if (c->timeout_usec > n)
2423 return 0;
2424
2425 r = bus_message_new_synthetic_error(
2426 bus,
2427 c->cookie,
2428 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Method call timed out"),
2429 &m);
2430 if (r < 0)
2431 return r;
2432
2433 m->read_counter = ++bus->read_counter;
2434
2435 r = bus_seal_synthetic_message(bus, m);
2436 if (r < 0)
2437 return r;
2438
2439 assert_se(prioq_pop(bus->reply_callbacks_prioq) == c);
2440 c->timeout_usec = 0;
2441
2442 ordered_hashmap_remove(bus->reply_callbacks, &c->cookie);
2443 c->cookie = 0;
2444
2445 slot = container_of(c, sd_bus_slot, reply_callback);
2446
2447 bus->iteration_counter++;
2448
2449 is_hello = bus->state == BUS_HELLO && c->callback == hello_callback;
2450
2451 bus->current_message = m;
2452 bus->current_slot = sd_bus_slot_ref(slot);
2453 bus->current_handler = c->callback;
2454 bus->current_userdata = slot->userdata;
2455 r = c->callback(m, slot->userdata, &error_buffer);
2456 bus->current_userdata = NULL;
2457 bus->current_handler = NULL;
2458 bus->current_slot = NULL;
2459 bus->current_message = NULL;
2460
2461 if (slot->floating)
2462 bus_slot_disconnect(slot, true);
2463
2464 sd_bus_slot_unref(slot);
2465
2466 /* When this is the hello message and it timed out, then make sure to propagate the error up, don't just log
2467 * and ignore the callback handler's return value. */
2468 if (is_hello)
2469 return r;
2470
2471 return bus_maybe_reply_error(m, r, &error_buffer);
2472 }
2473
2474 static int process_hello(sd_bus *bus, sd_bus_message *m) {
2475 assert(bus);
2476 assert(m);
2477
2478 if (bus->state != BUS_HELLO)
2479 return 0;
2480
2481 /* Let's make sure the first message on the bus is the HELLO
2482 * reply. But note that we don't actually parse the message
2483 * here (we leave that to the usual handling), we just verify
2484 * we don't let any earlier msg through. */
2485
2486 if (!IN_SET(m->header->type, SD_BUS_MESSAGE_METHOD_RETURN, SD_BUS_MESSAGE_METHOD_ERROR))
2487 return -EIO;
2488
2489 if (m->reply_cookie != 1)
2490 return -EIO;
2491
2492 return 0;
2493 }
2494
2495 static int process_reply(sd_bus *bus, sd_bus_message *m) {
2496 _cleanup_(sd_bus_message_unrefp) sd_bus_message *synthetic_reply = NULL;
2497 _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
2498 struct reply_callback *c;
2499 sd_bus_slot *slot;
2500 bool is_hello;
2501 int r;
2502
2503 assert(bus);
2504 assert(m);
2505
2506 if (!IN_SET(m->header->type, SD_BUS_MESSAGE_METHOD_RETURN, SD_BUS_MESSAGE_METHOD_ERROR))
2507 return 0;
2508
2509 if (m->destination && bus->unique_name && !streq_ptr(m->destination, bus->unique_name))
2510 return 0;
2511
2512 c = ordered_hashmap_remove(bus->reply_callbacks, &m->reply_cookie);
2513 if (!c)
2514 return 0;
2515
2516 c->cookie = 0;
2517
2518 slot = container_of(c, sd_bus_slot, reply_callback);
2519
2520 if (m->n_fds > 0 && !bus->accept_fd) {
2521
2522 /* If the reply contained a file descriptor which we
2523 * didn't want we pass an error instead. */
2524
2525 r = bus_message_new_synthetic_error(
2526 bus,
2527 m->reply_cookie,
2528 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INCONSISTENT_MESSAGE, "Reply message contained file descriptor"),
2529 &synthetic_reply);
2530 if (r < 0)
2531 return r;
2532
2533 /* Copy over original timestamp */
2534 synthetic_reply->realtime = m->realtime;
2535 synthetic_reply->monotonic = m->monotonic;
2536 synthetic_reply->seqnum = m->seqnum;
2537 synthetic_reply->read_counter = m->read_counter;
2538
2539 r = bus_seal_synthetic_message(bus, synthetic_reply);
2540 if (r < 0)
2541 return r;
2542
2543 m = synthetic_reply;
2544 } else {
2545 r = sd_bus_message_rewind(m, true);
2546 if (r < 0)
2547 return r;
2548 }
2549
2550 if (c->timeout_usec != 0) {
2551 prioq_remove(bus->reply_callbacks_prioq, c, &c->prioq_idx);
2552 c->timeout_usec = 0;
2553 }
2554
2555 is_hello = bus->state == BUS_HELLO && c->callback == hello_callback;
2556
2557 bus->current_slot = sd_bus_slot_ref(slot);
2558 bus->current_handler = c->callback;
2559 bus->current_userdata = slot->userdata;
2560 r = c->callback(m, slot->userdata, &error_buffer);
2561 bus->current_userdata = NULL;
2562 bus->current_handler = NULL;
2563 bus->current_slot = NULL;
2564
2565 if (slot->floating)
2566 bus_slot_disconnect(slot, true);
2567
2568 sd_bus_slot_unref(slot);
2569
2570 /* When this is the hello message and it failed, then make sure to propagate the error up, don't just log and
2571 * ignore the callback handler's return value. */
2572 if (is_hello)
2573 return r;
2574
2575 return bus_maybe_reply_error(m, r, &error_buffer);
2576 }
2577
2578 static int process_filter(sd_bus *bus, sd_bus_message *m) {
2579 _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
2580 struct filter_callback *l;
2581 int r;
2582
2583 assert(bus);
2584 assert(m);
2585
2586 do {
2587 bus->filter_callbacks_modified = false;
2588
2589 LIST_FOREACH(callbacks, l, bus->filter_callbacks) {
2590 sd_bus_slot *slot;
2591
2592 if (bus->filter_callbacks_modified)
2593 break;
2594
2595 /* Don't run this more than once per iteration */
2596 if (l->last_iteration == bus->iteration_counter)
2597 continue;
2598
2599 l->last_iteration = bus->iteration_counter;
2600
2601 r = sd_bus_message_rewind(m, true);
2602 if (r < 0)
2603 return r;
2604
2605 slot = container_of(l, sd_bus_slot, filter_callback);
2606
2607 bus->current_slot = sd_bus_slot_ref(slot);
2608 bus->current_handler = l->callback;
2609 bus->current_userdata = slot->userdata;
2610 r = l->callback(m, slot->userdata, &error_buffer);
2611 bus->current_userdata = NULL;
2612 bus->current_handler = NULL;
2613 bus->current_slot = sd_bus_slot_unref(slot);
2614
2615 r = bus_maybe_reply_error(m, r, &error_buffer);
2616 if (r != 0)
2617 return r;
2618
2619 }
2620
2621 } while (bus->filter_callbacks_modified);
2622
2623 return 0;
2624 }
2625
2626 static int process_match(sd_bus *bus, sd_bus_message *m) {
2627 int r;
2628
2629 assert(bus);
2630 assert(m);
2631
2632 do {
2633 bus->match_callbacks_modified = false;
2634
2635 r = bus_match_run(bus, &bus->match_callbacks, m);
2636 if (r != 0)
2637 return r;
2638
2639 } while (bus->match_callbacks_modified);
2640
2641 return 0;
2642 }
2643
2644 static int process_builtin(sd_bus *bus, sd_bus_message *m) {
2645 _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
2646 int r;
2647
2648 assert(bus);
2649 assert(m);
2650
2651 if (bus->is_monitor)
2652 return 0;
2653
2654 if (bus->manual_peer_interface)
2655 return 0;
2656
2657 if (m->header->type != SD_BUS_MESSAGE_METHOD_CALL)
2658 return 0;
2659
2660 if (!streq_ptr(m->interface, "org.freedesktop.DBus.Peer"))
2661 return 0;
2662
2663 if (m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED)
2664 return 1;
2665
2666 if (streq_ptr(m->member, "Ping"))
2667 r = sd_bus_message_new_method_return(m, &reply);
2668 else if (streq_ptr(m->member, "GetMachineId")) {
2669 sd_id128_t id;
2670 char sid[SD_ID128_STRING_MAX];
2671
2672 r = sd_id128_get_machine(&id);
2673 if (r < 0)
2674 return r;
2675
2676 r = sd_bus_message_new_method_return(m, &reply);
2677 if (r < 0)
2678 return r;
2679
2680 r = sd_bus_message_append(reply, "s", sd_id128_to_string(id, sid));
2681 } else {
2682 r = sd_bus_message_new_method_errorf(
2683 m, &reply,
2684 SD_BUS_ERROR_UNKNOWN_METHOD,
2685 "Unknown method '%s' on interface '%s'.", m->member, m->interface);
2686 }
2687 if (r < 0)
2688 return r;
2689
2690 r = sd_bus_send(bus, reply, NULL);
2691 if (r < 0)
2692 return r;
2693
2694 return 1;
2695 }
2696
2697 static int process_fd_check(sd_bus *bus, sd_bus_message *m) {
2698 assert(bus);
2699 assert(m);
2700
2701 /* If we got a message with a file descriptor which we didn't
2702 * want to accept, then let's drop it. How can this even
2703 * happen? For example, when the kernel queues a message into
2704 * an activatable names's queue which allows fds, and then is
2705 * delivered to us later even though we ourselves did not
2706 * negotiate it. */
2707
2708 if (bus->is_monitor)
2709 return 0;
2710
2711 if (m->n_fds <= 0)
2712 return 0;
2713
2714 if (bus->accept_fd)
2715 return 0;
2716
2717 if (m->header->type != SD_BUS_MESSAGE_METHOD_CALL)
2718 return 1; /* just eat it up */
2719
2720 return sd_bus_reply_method_errorf(m, SD_BUS_ERROR_INCONSISTENT_MESSAGE, "Message contains file descriptors, which I cannot accept. Sorry.");
2721 }
2722
2723 static int process_message(sd_bus *bus, sd_bus_message *m) {
2724 int r;
2725
2726 assert(bus);
2727 assert(m);
2728
2729 bus->current_message = m;
2730 bus->iteration_counter++;
2731
2732 log_debug_bus_message(m);
2733
2734 r = process_hello(bus, m);
2735 if (r != 0)
2736 goto finish;
2737
2738 r = process_reply(bus, m);
2739 if (r != 0)
2740 goto finish;
2741
2742 r = process_fd_check(bus, m);
2743 if (r != 0)
2744 goto finish;
2745
2746 r = process_filter(bus, m);
2747 if (r != 0)
2748 goto finish;
2749
2750 r = process_match(bus, m);
2751 if (r != 0)
2752 goto finish;
2753
2754 r = process_builtin(bus, m);
2755 if (r != 0)
2756 goto finish;
2757
2758 r = bus_process_object(bus, m);
2759
2760 finish:
2761 bus->current_message = NULL;
2762 return r;
2763 }
2764
2765 static int dispatch_track(sd_bus *bus) {
2766 assert(bus);
2767
2768 if (!bus->track_queue)
2769 return 0;
2770
2771 bus_track_dispatch(bus->track_queue);
2772 return 1;
2773 }
2774
2775 static int process_running(sd_bus *bus, sd_bus_message **ret) {
2776 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
2777 int r;
2778
2779 assert(bus);
2780 assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO));
2781
2782 r = process_timeout(bus);
2783 if (r != 0)
2784 goto null_message;
2785
2786 r = dispatch_wqueue(bus);
2787 if (r != 0)
2788 goto null_message;
2789
2790 r = dispatch_track(bus);
2791 if (r != 0)
2792 goto null_message;
2793
2794 r = dispatch_rqueue(bus, &m);
2795 if (r < 0)
2796 return r;
2797 if (!m)
2798 goto null_message;
2799
2800 r = process_message(bus, m);
2801 if (r != 0)
2802 goto null_message;
2803
2804 if (ret) {
2805 r = sd_bus_message_rewind(m, true);
2806 if (r < 0)
2807 return r;
2808
2809 *ret = TAKE_PTR(m);
2810 return 1;
2811 }
2812
2813 if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL) {
2814
2815 log_debug("Unprocessed message call sender=%s object=%s interface=%s member=%s",
2816 strna(sd_bus_message_get_sender(m)),
2817 strna(sd_bus_message_get_path(m)),
2818 strna(sd_bus_message_get_interface(m)),
2819 strna(sd_bus_message_get_member(m)));
2820
2821 r = sd_bus_reply_method_errorf(
2822 m,
2823 SD_BUS_ERROR_UNKNOWN_OBJECT,
2824 "Unknown object '%s'.", m->path);
2825 if (r < 0)
2826 return r;
2827 }
2828
2829 return 1;
2830
2831 null_message:
2832 if (r >= 0 && ret)
2833 *ret = NULL;
2834
2835 return r;
2836 }
2837
2838 static int bus_exit_now(sd_bus *bus) {
2839 assert(bus);
2840
2841 /* Exit due to close, if this is requested. If this is bus object is attached to an event source, invokes
2842 * sd_event_exit(), otherwise invokes libc exit(). */
2843
2844 if (bus->exited) /* did we already exit? */
2845 return 0;
2846 if (!bus->exit_triggered) /* was the exit condition triggered? */
2847 return 0;
2848 if (!bus->exit_on_disconnect) /* Shall we actually exit on disconnection? */
2849 return 0;
2850
2851 bus->exited = true; /* never exit more than once */
2852
2853 log_debug("Bus connection disconnected, exiting.");
2854
2855 if (bus->event)
2856 return sd_event_exit(bus->event, EXIT_FAILURE);
2857 else
2858 exit(EXIT_FAILURE);
2859
2860 assert_not_reached("exit() didn't exit?");
2861 }
2862
2863 static int process_closing_reply_callback(sd_bus *bus, struct reply_callback *c) {
2864 _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
2865 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
2866 sd_bus_slot *slot;
2867 int r;
2868
2869 assert(bus);
2870 assert(c);
2871
2872 r = bus_message_new_synthetic_error(
2873 bus,
2874 c->cookie,
2875 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Connection terminated"),
2876 &m);
2877 if (r < 0)
2878 return r;
2879
2880 m->read_counter = ++bus->read_counter;
2881
2882 r = bus_seal_synthetic_message(bus, m);
2883 if (r < 0)
2884 return r;
2885
2886 if (c->timeout_usec != 0) {
2887 prioq_remove(bus->reply_callbacks_prioq, c, &c->prioq_idx);
2888 c->timeout_usec = 0;
2889 }
2890
2891 ordered_hashmap_remove(bus->reply_callbacks, &c->cookie);
2892 c->cookie = 0;
2893
2894 slot = container_of(c, sd_bus_slot, reply_callback);
2895
2896 bus->iteration_counter++;
2897
2898 bus->current_message = m;
2899 bus->current_slot = sd_bus_slot_ref(slot);
2900 bus->current_handler = c->callback;
2901 bus->current_userdata = slot->userdata;
2902 r = c->callback(m, slot->userdata, &error_buffer);
2903 bus->current_userdata = NULL;
2904 bus->current_handler = NULL;
2905 bus->current_slot = NULL;
2906 bus->current_message = NULL;
2907
2908 if (slot->floating)
2909 bus_slot_disconnect(slot, true);
2910
2911 sd_bus_slot_unref(slot);
2912
2913 return bus_maybe_reply_error(m, r, &error_buffer);
2914 }
2915
2916 static int process_closing(sd_bus *bus, sd_bus_message **ret) {
2917 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
2918 struct reply_callback *c;
2919 int r;
2920
2921 assert(bus);
2922 assert(bus->state == BUS_CLOSING);
2923
2924 /* First, fail all outstanding method calls */
2925 c = ordered_hashmap_first(bus->reply_callbacks);
2926 if (c)
2927 return process_closing_reply_callback(bus, c);
2928
2929 /* Then, fake-drop all remaining bus tracking references */
2930 if (bus->tracks) {
2931 bus_track_close(bus->tracks);
2932 return 1;
2933 }
2934
2935 /* Then, synthesize a Disconnected message */
2936 r = sd_bus_message_new_signal(
2937 bus,
2938 &m,
2939 "/org/freedesktop/DBus/Local",
2940 "org.freedesktop.DBus.Local",
2941 "Disconnected");
2942 if (r < 0)
2943 return r;
2944
2945 bus_message_set_sender_local(bus, m);
2946 m->read_counter = ++bus->read_counter;
2947
2948 r = bus_seal_synthetic_message(bus, m);
2949 if (r < 0)
2950 return r;
2951
2952 sd_bus_close(bus);
2953
2954 bus->current_message = m;
2955 bus->iteration_counter++;
2956
2957 r = process_filter(bus, m);
2958 if (r != 0)
2959 goto finish;
2960
2961 r = process_match(bus, m);
2962 if (r != 0)
2963 goto finish;
2964
2965 /* Nothing else to do, exit now, if the condition holds */
2966 bus->exit_triggered = true;
2967 (void) bus_exit_now(bus);
2968
2969 if (ret)
2970 *ret = TAKE_PTR(m);
2971
2972 r = 1;
2973
2974 finish:
2975 bus->current_message = NULL;
2976
2977 return r;
2978 }
2979
2980 static int bus_process_internal(sd_bus *bus, sd_bus_message **ret) {
2981 int r;
2982
2983 /* Returns 0 when we didn't do anything. This should cause the
2984 * caller to invoke sd_bus_wait() before returning the next
2985 * time. Returns > 0 when we did something, which possibly
2986 * means *ret is filled in with an unprocessed message. */
2987
2988 assert_return(bus, -EINVAL);
2989 assert_return(bus = bus_resolve(bus), -ENOPKG);
2990 assert_return(!bus_pid_changed(bus), -ECHILD);
2991
2992 /* We don't allow recursively invoking sd_bus_process(). */
2993 assert_return(!bus->current_message, -EBUSY);
2994 assert(!bus->current_slot); /* This should be NULL whenever bus->current_message is */
2995
2996 BUS_DONT_DESTROY(bus);
2997
2998 switch (bus->state) {
2999
3000 case BUS_UNSET:
3001 return -ENOTCONN;
3002
3003 case BUS_CLOSED:
3004 return -ECONNRESET;
3005
3006 case BUS_WATCH_BIND:
3007 r = bus_socket_process_watch_bind(bus);
3008 break;
3009
3010 case BUS_OPENING:
3011 r = bus_socket_process_opening(bus);
3012 break;
3013
3014 case BUS_AUTHENTICATING:
3015 r = bus_socket_process_authenticating(bus);
3016 break;
3017
3018 case BUS_RUNNING:
3019 case BUS_HELLO:
3020 r = process_running(bus, ret);
3021 if (r >= 0)
3022 return r;
3023
3024 /* This branch initializes *ret, hence we don't use the generic error checking below */
3025 break;
3026
3027 case BUS_CLOSING:
3028 return process_closing(bus, ret);
3029
3030 default:
3031 assert_not_reached("Unknown state");
3032 }
3033
3034 if (ERRNO_IS_DISCONNECT(r)) {
3035 bus_enter_closing(bus);
3036 r = 1;
3037 } else if (r < 0)
3038 return r;
3039
3040 if (ret)
3041 *ret = NULL;
3042
3043 return r;
3044 }
3045
3046 _public_ int sd_bus_process(sd_bus *bus, sd_bus_message **ret) {
3047 return bus_process_internal(bus, ret);
3048 }
3049
3050 _public_ int sd_bus_process_priority(sd_bus *bus, int64_t priority, sd_bus_message **ret) {
3051 return bus_process_internal(bus, ret);
3052 }
3053
3054 static int bus_poll(sd_bus *bus, bool need_more, uint64_t timeout_usec) {
3055 struct pollfd p[2] = {};
3056 int r, n;
3057 struct timespec ts;
3058 usec_t m = USEC_INFINITY;
3059
3060 assert(bus);
3061
3062 if (bus->state == BUS_CLOSING)
3063 return 1;
3064
3065 if (!BUS_IS_OPEN(bus->state))
3066 return -ENOTCONN;
3067
3068 if (bus->state == BUS_WATCH_BIND) {
3069 assert(bus->inotify_fd >= 0);
3070
3071 p[0].events = POLLIN;
3072 p[0].fd = bus->inotify_fd;
3073 n = 1;
3074 } else {
3075 int e;
3076
3077 e = sd_bus_get_events(bus);
3078 if (e < 0)
3079 return e;
3080
3081 if (need_more)
3082 /* The caller really needs some more data, he doesn't
3083 * care about what's already read, or any timeouts
3084 * except its own. */
3085 e |= POLLIN;
3086 else {
3087 usec_t until;
3088 /* The caller wants to process if there's something to
3089 * process, but doesn't care otherwise */
3090
3091 r = sd_bus_get_timeout(bus, &until);
3092 if (r < 0)
3093 return r;
3094 if (r > 0)
3095 m = usec_sub_unsigned(until, now(CLOCK_MONOTONIC));
3096 }
3097
3098 p[0].fd = bus->input_fd;
3099 if (bus->output_fd == bus->input_fd) {
3100 p[0].events = e;
3101 n = 1;
3102 } else {
3103 p[0].events = e & POLLIN;
3104 p[1].fd = bus->output_fd;
3105 p[1].events = e & POLLOUT;
3106 n = 2;
3107 }
3108 }
3109
3110 if (timeout_usec != (uint64_t) -1 && (m == USEC_INFINITY || timeout_usec < m))
3111 m = timeout_usec;
3112
3113 r = ppoll(p, n, m == USEC_INFINITY ? NULL : timespec_store(&ts, m), NULL);
3114 if (r < 0)
3115 return -errno;
3116
3117 return r > 0 ? 1 : 0;
3118 }
3119
3120 _public_ int sd_bus_wait(sd_bus *bus, uint64_t timeout_usec) {
3121
3122 assert_return(bus, -EINVAL);
3123 assert_return(bus = bus_resolve(bus), -ENOPKG);
3124 assert_return(!bus_pid_changed(bus), -ECHILD);
3125
3126 if (bus->state == BUS_CLOSING)
3127 return 0;
3128
3129 if (!BUS_IS_OPEN(bus->state))
3130 return -ENOTCONN;
3131
3132 if (bus->rqueue_size > 0)
3133 return 0;
3134
3135 return bus_poll(bus, false, timeout_usec);
3136 }
3137
3138 _public_ int sd_bus_flush(sd_bus *bus) {
3139 int r;
3140
3141 assert_return(bus, -EINVAL);
3142 assert_return(bus = bus_resolve(bus), -ENOPKG);
3143 assert_return(!bus_pid_changed(bus), -ECHILD);
3144
3145 if (bus->state == BUS_CLOSING)
3146 return 0;
3147
3148 if (!BUS_IS_OPEN(bus->state))
3149 return -ENOTCONN;
3150
3151 /* We never were connected? Don't hang in inotify for good, as there's no timeout set for it */
3152 if (bus->state == BUS_WATCH_BIND)
3153 return -EUNATCH;
3154
3155 r = bus_ensure_running(bus);
3156 if (r < 0)
3157 return r;
3158
3159 if (bus->wqueue_size <= 0)
3160 return 0;
3161
3162 for (;;) {
3163 r = dispatch_wqueue(bus);
3164 if (r < 0) {
3165 if (ERRNO_IS_DISCONNECT(r)) {
3166 bus_enter_closing(bus);
3167 return -ECONNRESET;
3168 }
3169
3170 return r;
3171 }
3172
3173 if (bus->wqueue_size <= 0)
3174 return 0;
3175
3176 r = bus_poll(bus, false, (uint64_t) -1);
3177 if (r < 0)
3178 return r;
3179 }
3180 }
3181
3182 _public_ int sd_bus_add_filter(
3183 sd_bus *bus,
3184 sd_bus_slot **slot,
3185 sd_bus_message_handler_t callback,
3186 void *userdata) {
3187
3188 sd_bus_slot *s;
3189
3190 assert_return(bus, -EINVAL);
3191 assert_return(bus = bus_resolve(bus), -ENOPKG);
3192 assert_return(callback, -EINVAL);
3193 assert_return(!bus_pid_changed(bus), -ECHILD);
3194
3195 s = bus_slot_allocate(bus, !slot, BUS_FILTER_CALLBACK, sizeof(struct filter_callback), userdata);
3196 if (!s)
3197 return -ENOMEM;
3198
3199 s->filter_callback.callback = callback;
3200
3201 bus->filter_callbacks_modified = true;
3202 LIST_PREPEND(callbacks, bus->filter_callbacks, &s->filter_callback);
3203
3204 if (slot)
3205 *slot = s;
3206
3207 return 0;
3208 }
3209
3210 static int add_match_callback(
3211 sd_bus_message *m,
3212 void *userdata,
3213 sd_bus_error *ret_error) {
3214
3215 sd_bus_slot *match_slot = userdata;
3216 bool failed = false;
3217 int r;
3218
3219 assert(m);
3220 assert(match_slot);
3221
3222 sd_bus_slot_ref(match_slot);
3223
3224 if (sd_bus_message_is_method_error(m, NULL)) {
3225 log_debug_errno(sd_bus_message_get_errno(m),
3226 "Unable to add match %s, failing connection: %s",
3227 match_slot->match_callback.match_string,
3228 sd_bus_message_get_error(m)->message);
3229
3230 failed = true;
3231 } else
3232 log_debug("Match %s successfully installed.", match_slot->match_callback.match_string);
3233
3234 if (match_slot->match_callback.install_callback) {
3235 sd_bus *bus;
3236
3237 bus = sd_bus_message_get_bus(m);
3238
3239 /* This function has been called as slot handler, and we want to call another slot handler. Let's
3240 * update the slot callback metadata temporarily with our own data, and then revert back to the old
3241 * values. */
3242
3243 assert(bus->current_slot == match_slot->match_callback.install_slot);
3244 assert(bus->current_handler == add_match_callback);
3245 assert(bus->current_userdata == userdata);
3246
3247 bus->current_slot = match_slot;
3248 bus->current_handler = match_slot->match_callback.install_callback;
3249 bus->current_userdata = match_slot->userdata;
3250
3251 r = match_slot->match_callback.install_callback(m, match_slot->userdata, ret_error);
3252
3253 bus->current_slot = match_slot->match_callback.install_slot;
3254 bus->current_handler = add_match_callback;
3255 bus->current_userdata = userdata;
3256 } else {
3257 if (failed) /* Generic failure handling: destroy the connection */
3258 bus_enter_closing(sd_bus_message_get_bus(m));
3259
3260 r = 1;
3261 }
3262
3263 /* We don't need the install method reply slot anymore, let's free it */
3264 match_slot->match_callback.install_slot = sd_bus_slot_unref(match_slot->match_callback.install_slot);
3265
3266 if (failed && match_slot->floating)
3267 bus_slot_disconnect(match_slot, true);
3268
3269 sd_bus_slot_unref(match_slot);
3270
3271 return r;
3272 }
3273
3274 static int bus_add_match_full(
3275 sd_bus *bus,
3276 sd_bus_slot **slot,
3277 bool asynchronous,
3278 const char *match,
3279 sd_bus_message_handler_t callback,
3280 sd_bus_message_handler_t install_callback,
3281 void *userdata) {
3282
3283 struct bus_match_component *components = NULL;
3284 unsigned n_components = 0;
3285 sd_bus_slot *s = NULL;
3286 int r = 0;
3287
3288 assert_return(bus, -EINVAL);
3289 assert_return(bus = bus_resolve(bus), -ENOPKG);
3290 assert_return(match, -EINVAL);
3291 assert_return(!bus_pid_changed(bus), -ECHILD);
3292
3293 r = bus_match_parse(match, &components, &n_components);
3294 if (r < 0)
3295 goto finish;
3296
3297 s = bus_slot_allocate(bus, !slot, BUS_MATCH_CALLBACK, sizeof(struct match_callback), userdata);
3298 if (!s) {
3299 r = -ENOMEM;
3300 goto finish;
3301 }
3302
3303 s->match_callback.callback = callback;
3304 s->match_callback.install_callback = install_callback;
3305
3306 if (bus->bus_client) {
3307 enum bus_match_scope scope;
3308
3309 scope = bus_match_get_scope(components, n_components);
3310
3311 /* Do not install server-side matches for matches against the local service, interface or bus path. */
3312 if (scope != BUS_MATCH_LOCAL) {
3313
3314 /* We store the original match string, so that we can use it to remove the match again. */
3315
3316 s->match_callback.match_string = strdup(match);
3317 if (!s->match_callback.match_string) {
3318 r = -ENOMEM;
3319 goto finish;
3320 }
3321
3322 if (asynchronous) {
3323 r = bus_add_match_internal_async(bus,
3324 &s->match_callback.install_slot,
3325 s->match_callback.match_string,
3326 add_match_callback,
3327 s);
3328
3329 if (r < 0)
3330 return r;
3331
3332 /* Make the slot of the match call floating now. We need the reference, but we don't
3333 * want that this match pins the bus object, hence we first create it non-floating, but
3334 * then make it floating. */
3335 r = sd_bus_slot_set_floating(s->match_callback.install_slot, true);
3336 } else
3337 r = bus_add_match_internal(bus, s->match_callback.match_string, &s->match_callback.after);
3338 if (r < 0)
3339 goto finish;
3340
3341 s->match_added = true;
3342 }
3343 }
3344
3345 bus->match_callbacks_modified = true;
3346 r = bus_match_add(&bus->match_callbacks, components, n_components, &s->match_callback);
3347 if (r < 0)
3348 goto finish;
3349
3350 if (slot)
3351 *slot = s;
3352 s = NULL;
3353
3354 finish:
3355 bus_match_parse_free(components, n_components);
3356 sd_bus_slot_unref(s);
3357
3358 return r;
3359 }
3360
3361 _public_ int sd_bus_add_match(
3362 sd_bus *bus,
3363 sd_bus_slot **slot,
3364 const char *match,
3365 sd_bus_message_handler_t callback,
3366 void *userdata) {
3367
3368 return bus_add_match_full(bus, slot, false, match, callback, NULL, userdata);
3369 }
3370
3371 _public_ int sd_bus_add_match_async(
3372 sd_bus *bus,
3373 sd_bus_slot **slot,
3374 const char *match,
3375 sd_bus_message_handler_t callback,
3376 sd_bus_message_handler_t install_callback,
3377 void *userdata) {
3378
3379 return bus_add_match_full(bus, slot, true, match, callback, install_callback, userdata);
3380 }
3381
3382 bool bus_pid_changed(sd_bus *bus) {
3383 assert(bus);
3384
3385 /* We don't support people creating a bus connection and
3386 * keeping it around over a fork(). Let's complain. */
3387
3388 return bus->original_pid != getpid_cached();
3389 }
3390
3391 static int io_callback(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
3392 sd_bus *bus = userdata;
3393 int r;
3394
3395 assert(bus);
3396
3397 /* Note that this is called both on input_fd, output_fd as well as inotify_fd events */
3398
3399 r = sd_bus_process(bus, NULL);
3400 if (r < 0) {
3401 log_debug_errno(r, "Processing of bus failed, closing down: %m");
3402 bus_enter_closing(bus);
3403 }
3404
3405 return 1;
3406 }
3407
3408 static int time_callback(sd_event_source *s, uint64_t usec, void *userdata) {
3409 sd_bus *bus = userdata;
3410 int r;
3411
3412 assert(bus);
3413
3414 r = sd_bus_process(bus, NULL);
3415 if (r < 0) {
3416 log_debug_errno(r, "Processing of bus failed, closing down: %m");
3417 bus_enter_closing(bus);
3418 }
3419
3420 return 1;
3421 }
3422
3423 static int prepare_callback(sd_event_source *s, void *userdata) {
3424 sd_bus *bus = userdata;
3425 int r, e;
3426 usec_t until;
3427
3428 assert(s);
3429 assert(bus);
3430
3431 e = sd_bus_get_events(bus);
3432 if (e < 0) {
3433 r = e;
3434 goto fail;
3435 }
3436
3437 if (bus->output_fd != bus->input_fd) {
3438
3439 r = sd_event_source_set_io_events(bus->input_io_event_source, e & POLLIN);
3440 if (r < 0)
3441 goto fail;
3442
3443 r = sd_event_source_set_io_events(bus->output_io_event_source, e & POLLOUT);
3444 } else
3445 r = sd_event_source_set_io_events(bus->input_io_event_source, e);
3446 if (r < 0)
3447 goto fail;
3448
3449 r = sd_bus_get_timeout(bus, &until);
3450 if (r < 0)
3451 goto fail;
3452 if (r > 0) {
3453 int j;
3454
3455 j = sd_event_source_set_time(bus->time_event_source, until);
3456 if (j < 0) {
3457 r = j;
3458 goto fail;
3459 }
3460 }
3461
3462 r = sd_event_source_set_enabled(bus->time_event_source, r > 0);
3463 if (r < 0)
3464 goto fail;
3465
3466 return 1;
3467
3468 fail:
3469 log_debug_errno(r, "Preparing of bus events failed, closing down: %m");
3470 bus_enter_closing(bus);
3471
3472 return 1;
3473 }
3474
3475 static int quit_callback(sd_event_source *event, void *userdata) {
3476 sd_bus *bus = userdata;
3477
3478 assert(event);
3479
3480 if (bus->close_on_exit) {
3481 sd_bus_flush(bus);
3482 sd_bus_close(bus);
3483 }
3484
3485 return 1;
3486 }
3487
3488 int bus_attach_io_events(sd_bus *bus) {
3489 int r;
3490
3491 assert(bus);
3492
3493 if (bus->input_fd < 0)
3494 return 0;
3495
3496 if (!bus->event)
3497 return 0;
3498
3499 if (!bus->input_io_event_source) {
3500 r = sd_event_add_io(bus->event, &bus->input_io_event_source, bus->input_fd, 0, io_callback, bus);
3501 if (r < 0)
3502 return r;
3503
3504 r = sd_event_source_set_prepare(bus->input_io_event_source, prepare_callback);
3505 if (r < 0)
3506 return r;
3507
3508 r = sd_event_source_set_priority(bus->input_io_event_source, bus->event_priority);
3509 if (r < 0)
3510 return r;
3511
3512 r = sd_event_source_set_description(bus->input_io_event_source, "bus-input");
3513 } else
3514 r = sd_event_source_set_io_fd(bus->input_io_event_source, bus->input_fd);
3515
3516 if (r < 0)
3517 return r;
3518
3519 if (bus->output_fd != bus->input_fd) {
3520 assert(bus->output_fd >= 0);
3521
3522 if (!bus->output_io_event_source) {
3523 r = sd_event_add_io(bus->event, &bus->output_io_event_source, bus->output_fd, 0, io_callback, bus);
3524 if (r < 0)
3525 return r;
3526
3527 r = sd_event_source_set_priority(bus->output_io_event_source, bus->event_priority);
3528 if (r < 0)
3529 return r;
3530
3531 r = sd_event_source_set_description(bus->input_io_event_source, "bus-output");
3532 } else
3533 r = sd_event_source_set_io_fd(bus->output_io_event_source, bus->output_fd);
3534
3535 if (r < 0)
3536 return r;
3537 }
3538
3539 return 0;
3540 }
3541
3542 static void bus_detach_io_events(sd_bus *bus) {
3543 assert(bus);
3544
3545 if (bus->input_io_event_source) {
3546 sd_event_source_set_enabled(bus->input_io_event_source, SD_EVENT_OFF);
3547 bus->input_io_event_source = sd_event_source_unref(bus->input_io_event_source);
3548 }
3549
3550 if (bus->output_io_event_source) {
3551 sd_event_source_set_enabled(bus->output_io_event_source, SD_EVENT_OFF);
3552 bus->output_io_event_source = sd_event_source_unref(bus->output_io_event_source);
3553 }
3554 }
3555
3556 int bus_attach_inotify_event(sd_bus *bus) {
3557 int r;
3558
3559 assert(bus);
3560
3561 if (bus->inotify_fd < 0)
3562 return 0;
3563
3564 if (!bus->event)
3565 return 0;
3566
3567 if (!bus->inotify_event_source) {
3568 r = sd_event_add_io(bus->event, &bus->inotify_event_source, bus->inotify_fd, EPOLLIN, io_callback, bus);
3569 if (r < 0)
3570 return r;
3571
3572 r = sd_event_source_set_priority(bus->inotify_event_source, bus->event_priority);
3573 if (r < 0)
3574 return r;
3575
3576 r = sd_event_source_set_description(bus->inotify_event_source, "bus-inotify");
3577 } else
3578 r = sd_event_source_set_io_fd(bus->inotify_event_source, bus->inotify_fd);
3579 if (r < 0)
3580 return r;
3581
3582 return 0;
3583 }
3584
3585 static void bus_detach_inotify_event(sd_bus *bus) {
3586 assert(bus);
3587
3588 if (bus->inotify_event_source) {
3589 sd_event_source_set_enabled(bus->inotify_event_source, SD_EVENT_OFF);
3590 bus->inotify_event_source = sd_event_source_unref(bus->inotify_event_source);
3591 }
3592 }
3593
3594 _public_ int sd_bus_attach_event(sd_bus *bus, sd_event *event, int priority) {
3595 int r;
3596
3597 assert_return(bus, -EINVAL);
3598 assert_return(bus = bus_resolve(bus), -ENOPKG);
3599 assert_return(!bus->event, -EBUSY);
3600
3601 assert(!bus->input_io_event_source);
3602 assert(!bus->output_io_event_source);
3603 assert(!bus->time_event_source);
3604
3605 if (event)
3606 bus->event = sd_event_ref(event);
3607 else {
3608 r = sd_event_default(&bus->event);
3609 if (r < 0)
3610 return r;
3611 }
3612
3613 bus->event_priority = priority;
3614
3615 r = sd_event_add_time(bus->event, &bus->time_event_source, CLOCK_MONOTONIC, 0, 0, time_callback, bus);
3616 if (r < 0)
3617 goto fail;
3618
3619 r = sd_event_source_set_priority(bus->time_event_source, priority);
3620 if (r < 0)
3621 goto fail;
3622
3623 r = sd_event_source_set_description(bus->time_event_source, "bus-time");
3624 if (r < 0)
3625 goto fail;
3626
3627 r = sd_event_add_exit(bus->event, &bus->quit_event_source, quit_callback, bus);
3628 if (r < 0)
3629 goto fail;
3630
3631 r = sd_event_source_set_description(bus->quit_event_source, "bus-exit");
3632 if (r < 0)
3633 goto fail;
3634
3635 r = bus_attach_io_events(bus);
3636 if (r < 0)
3637 goto fail;
3638
3639 r = bus_attach_inotify_event(bus);
3640 if (r < 0)
3641 goto fail;
3642
3643 return 0;
3644
3645 fail:
3646 sd_bus_detach_event(bus);
3647 return r;
3648 }
3649
3650 _public_ int sd_bus_detach_event(sd_bus *bus) {
3651 assert_return(bus, -EINVAL);
3652 assert_return(bus = bus_resolve(bus), -ENOPKG);
3653
3654 if (!bus->event)
3655 return 0;
3656
3657 bus_detach_io_events(bus);
3658 bus_detach_inotify_event(bus);
3659
3660 if (bus->time_event_source) {
3661 sd_event_source_set_enabled(bus->time_event_source, SD_EVENT_OFF);
3662 bus->time_event_source = sd_event_source_unref(bus->time_event_source);
3663 }
3664
3665 if (bus->quit_event_source) {
3666 sd_event_source_set_enabled(bus->quit_event_source, SD_EVENT_OFF);
3667 bus->quit_event_source = sd_event_source_unref(bus->quit_event_source);
3668 }
3669
3670 bus->event = sd_event_unref(bus->event);
3671 return 1;
3672 }
3673
3674 _public_ sd_event* sd_bus_get_event(sd_bus *bus) {
3675 assert_return(bus = bus_resolve(bus), NULL);
3676
3677 return bus->event;
3678 }
3679
3680 _public_ sd_bus_message* sd_bus_get_current_message(sd_bus *bus) {
3681 assert_return(bus = bus_resolve(bus), NULL);
3682
3683 return bus->current_message;
3684 }
3685
3686 _public_ sd_bus_slot* sd_bus_get_current_slot(sd_bus *bus) {
3687 assert_return(bus = bus_resolve(bus), NULL);
3688
3689 return bus->current_slot;
3690 }
3691
3692 _public_ sd_bus_message_handler_t sd_bus_get_current_handler(sd_bus *bus) {
3693 assert_return(bus = bus_resolve(bus), NULL);
3694
3695 return bus->current_handler;
3696 }
3697
3698 _public_ void* sd_bus_get_current_userdata(sd_bus *bus) {
3699 assert_return(bus = bus_resolve(bus), NULL);
3700
3701 return bus->current_userdata;
3702 }
3703
3704 static int bus_default(int (*bus_open)(sd_bus **), sd_bus **default_bus, sd_bus **ret) {
3705 sd_bus *b = NULL;
3706 int r;
3707
3708 assert(bus_open);
3709 assert(default_bus);
3710
3711 if (!ret)
3712 return !!*default_bus;
3713
3714 if (*default_bus) {
3715 *ret = sd_bus_ref(*default_bus);
3716 return 0;
3717 }
3718
3719 r = bus_open(&b);
3720 if (r < 0)
3721 return r;
3722
3723 b->default_bus_ptr = default_bus;
3724 b->tid = gettid();
3725 *default_bus = b;
3726
3727 *ret = b;
3728 return 1;
3729 }
3730
3731 _public_ int sd_bus_default_system(sd_bus **ret) {
3732 return bus_default(sd_bus_open_system, &default_system_bus, ret);
3733 }
3734
3735 _public_ int sd_bus_default_user(sd_bus **ret) {
3736 return bus_default(sd_bus_open_user, &default_user_bus, ret);
3737 }
3738
3739 _public_ int sd_bus_default(sd_bus **ret) {
3740 int (*bus_open)(sd_bus **) = NULL;
3741 sd_bus **busp;
3742
3743 busp = bus_choose_default(&bus_open);
3744 return bus_default(bus_open, busp, ret);
3745 }
3746
3747 _public_ int sd_bus_get_tid(sd_bus *b, pid_t *tid) {
3748 assert_return(b, -EINVAL);
3749 assert_return(tid, -EINVAL);
3750 assert_return(!bus_pid_changed(b), -ECHILD);
3751
3752 if (b->tid != 0) {
3753 *tid = b->tid;
3754 return 0;
3755 }
3756
3757 if (b->event)
3758 return sd_event_get_tid(b->event, tid);
3759
3760 return -ENXIO;
3761 }
3762
3763 _public_ int sd_bus_path_encode(const char *prefix, const char *external_id, char **ret_path) {
3764 _cleanup_free_ char *e = NULL;
3765 char *ret;
3766
3767 assert_return(object_path_is_valid(prefix), -EINVAL);
3768 assert_return(external_id, -EINVAL);
3769 assert_return(ret_path, -EINVAL);
3770
3771 e = bus_label_escape(external_id);
3772 if (!e)
3773 return -ENOMEM;
3774
3775 ret = path_join(prefix, e);
3776 if (!ret)
3777 return -ENOMEM;
3778
3779 *ret_path = ret;
3780 return 0;
3781 }
3782
3783 _public_ int sd_bus_path_decode(const char *path, const char *prefix, char **external_id) {
3784 const char *e;
3785 char *ret;
3786
3787 assert_return(object_path_is_valid(path), -EINVAL);
3788 assert_return(object_path_is_valid(prefix), -EINVAL);
3789 assert_return(external_id, -EINVAL);
3790
3791 e = object_path_startswith(path, prefix);
3792 if (!e) {
3793 *external_id = NULL;
3794 return 0;
3795 }
3796
3797 ret = bus_label_unescape(e);
3798 if (!ret)
3799 return -ENOMEM;
3800
3801 *external_id = ret;
3802 return 1;
3803 }
3804
3805 _public_ int sd_bus_path_encode_many(char **out, const char *path_template, ...) {
3806 _cleanup_strv_free_ char **labels = NULL;
3807 char *path, *path_pos, **label_pos;
3808 const char *sep, *template_pos;
3809 size_t path_length;
3810 va_list list;
3811 int r;
3812
3813 assert_return(out, -EINVAL);
3814 assert_return(path_template, -EINVAL);
3815
3816 path_length = strlen(path_template);
3817
3818 va_start(list, path_template);
3819 for (sep = strchr(path_template, '%'); sep; sep = strchr(sep + 1, '%')) {
3820 const char *arg;
3821 char *label;
3822
3823 arg = va_arg(list, const char *);
3824 if (!arg) {
3825 va_end(list);
3826 return -EINVAL;
3827 }
3828
3829 label = bus_label_escape(arg);
3830 if (!label) {
3831 va_end(list);
3832 return -ENOMEM;
3833 }
3834
3835 r = strv_consume(&labels, label);
3836 if (r < 0) {
3837 va_end(list);
3838 return r;
3839 }
3840
3841 /* add label length, but account for the format character */
3842 path_length += strlen(label) - 1;
3843 }
3844 va_end(list);
3845
3846 path = malloc(path_length + 1);
3847 if (!path)
3848 return -ENOMEM;
3849
3850 path_pos = path;
3851 label_pos = labels;
3852
3853 for (template_pos = path_template; *template_pos; ) {
3854 sep = strchrnul(template_pos, '%');
3855 path_pos = mempcpy(path_pos, template_pos, sep - template_pos);
3856 if (!*sep)
3857 break;
3858
3859 path_pos = stpcpy(path_pos, *label_pos++);
3860 template_pos = sep + 1;
3861 }
3862
3863 *path_pos = 0;
3864 *out = path;
3865 return 0;
3866 }
3867
3868 _public_ int sd_bus_path_decode_many(const char *path, const char *path_template, ...) {
3869 _cleanup_strv_free_ char **labels = NULL;
3870 const char *template_pos, *path_pos;
3871 char **label_pos;
3872 va_list list;
3873 int r;
3874
3875 /*
3876 * This decodes an object-path based on a template argument. The
3877 * template consists of a verbatim path, optionally including special
3878 * directives:
3879 *
3880 * - Each occurrence of '%' in the template matches an arbitrary
3881 * substring of a label in the given path. At most one such
3882 * directive is allowed per label. For each such directive, the
3883 * caller must provide an output parameter (char **) via va_arg. If
3884 * NULL is passed, the given label is verified, but not returned.
3885 * For each matched label, the *decoded* label is stored in the
3886 * passed output argument, and the caller is responsible to free
3887 * it. Note that the output arguments are only modified if the
3888 * actually path matched the template. Otherwise, they're left
3889 * untouched.
3890 *
3891 * This function returns <0 on error, 0 if the path does not match the
3892 * template, 1 if it matched.
3893 */
3894
3895 assert_return(path, -EINVAL);
3896 assert_return(path_template, -EINVAL);
3897
3898 path_pos = path;
3899
3900 for (template_pos = path_template; *template_pos; ) {
3901 const char *sep;
3902 size_t length;
3903 char *label;
3904
3905 /* verify everything until the next '%' matches verbatim */
3906 sep = strchrnul(template_pos, '%');
3907 length = sep - template_pos;
3908 if (strncmp(path_pos, template_pos, length))
3909 return 0;
3910
3911 path_pos += length;
3912 template_pos += length;
3913
3914 if (!*template_pos)
3915 break;
3916
3917 /* We found the next '%' character. Everything up until here
3918 * matched. We now skip ahead to the end of this label and make
3919 * sure it matches the tail of the label in the path. Then we
3920 * decode the string in-between and save it for later use. */
3921
3922 ++template_pos; /* skip over '%' */
3923
3924 sep = strchrnul(template_pos, '/');
3925 length = sep - template_pos; /* length of suffix to match verbatim */
3926
3927 /* verify the suffixes match */
3928 sep = strchrnul(path_pos, '/');
3929 if (sep - path_pos < (ssize_t)length ||
3930 strncmp(sep - length, template_pos, length))
3931 return 0;
3932
3933 template_pos += length; /* skip over matched label */
3934 length = sep - path_pos - length; /* length of sub-label to decode */
3935
3936 /* store unescaped label for later use */
3937 label = bus_label_unescape_n(path_pos, length);
3938 if (!label)
3939 return -ENOMEM;
3940
3941 r = strv_consume(&labels, label);
3942 if (r < 0)
3943 return r;
3944
3945 path_pos = sep; /* skip decoded label and suffix */
3946 }
3947
3948 /* end of template must match end of path */
3949 if (*path_pos)
3950 return 0;
3951
3952 /* copy the labels over to the caller */
3953 va_start(list, path_template);
3954 for (label_pos = labels; label_pos && *label_pos; ++label_pos) {
3955 char **arg;
3956
3957 arg = va_arg(list, char **);
3958 if (arg)
3959 *arg = *label_pos;
3960 else
3961 free(*label_pos);
3962 }
3963 va_end(list);
3964
3965 labels = mfree(labels);
3966 return 1;
3967 }
3968
3969 _public_ int sd_bus_try_close(sd_bus *bus) {
3970 assert_return(bus, -EINVAL);
3971 assert_return(bus = bus_resolve(bus), -ENOPKG);
3972 assert_return(!bus_pid_changed(bus), -ECHILD);
3973
3974 return -EOPNOTSUPP;
3975 }
3976
3977 _public_ int sd_bus_get_description(sd_bus *bus, const char **description) {
3978 assert_return(bus, -EINVAL);
3979 assert_return(bus = bus_resolve(bus), -ENOPKG);
3980 assert_return(description, -EINVAL);
3981 assert_return(bus->description, -ENXIO);
3982 assert_return(!bus_pid_changed(bus), -ECHILD);
3983
3984 if (bus->description)
3985 *description = bus->description;
3986 else if (bus->is_system)
3987 *description = "system";
3988 else if (bus->is_user)
3989 *description = "user";
3990 else
3991 *description = NULL;
3992
3993 return 0;
3994 }
3995
3996 _public_ int sd_bus_get_scope(sd_bus *bus, const char **scope) {
3997 assert_return(bus, -EINVAL);
3998 assert_return(bus = bus_resolve(bus), -ENOPKG);
3999 assert_return(scope, -EINVAL);
4000 assert_return(!bus_pid_changed(bus), -ECHILD);
4001
4002 if (bus->is_user) {
4003 *scope = "user";
4004 return 0;
4005 }
4006
4007 if (bus->is_system) {
4008 *scope = "system";
4009 return 0;
4010 }
4011
4012 return -ENODATA;
4013 }
4014
4015 _public_ int sd_bus_get_address(sd_bus *bus, const char **address) {
4016 assert_return(bus, -EINVAL);
4017 assert_return(bus = bus_resolve(bus), -ENOPKG);
4018 assert_return(address, -EINVAL);
4019 assert_return(!bus_pid_changed(bus), -ECHILD);
4020
4021 if (bus->address) {
4022 *address = bus->address;
4023 return 0;
4024 }
4025
4026 return -ENODATA;
4027 }
4028
4029 _public_ int sd_bus_get_creds_mask(sd_bus *bus, uint64_t *mask) {
4030 assert_return(bus, -EINVAL);
4031 assert_return(bus = bus_resolve(bus), -ENOPKG);
4032 assert_return(mask, -EINVAL);
4033 assert_return(!bus_pid_changed(bus), -ECHILD);
4034
4035 *mask = bus->creds_mask;
4036 return 0;
4037 }
4038
4039 _public_ int sd_bus_is_bus_client(sd_bus *bus) {
4040 assert_return(bus, -EINVAL);
4041 assert_return(bus = bus_resolve(bus), -ENOPKG);
4042 assert_return(!bus_pid_changed(bus), -ECHILD);
4043
4044 return bus->bus_client;
4045 }
4046
4047 _public_ int sd_bus_is_server(sd_bus *bus) {
4048 assert_return(bus, -EINVAL);
4049 assert_return(bus = bus_resolve(bus), -ENOPKG);
4050 assert_return(!bus_pid_changed(bus), -ECHILD);
4051
4052 return bus->is_server;
4053 }
4054
4055 _public_ int sd_bus_is_anonymous(sd_bus *bus) {
4056 assert_return(bus, -EINVAL);
4057 assert_return(bus = bus_resolve(bus), -ENOPKG);
4058 assert_return(!bus_pid_changed(bus), -ECHILD);
4059
4060 return bus->anonymous_auth;
4061 }
4062
4063 _public_ int sd_bus_is_trusted(sd_bus *bus) {
4064 assert_return(bus, -EINVAL);
4065 assert_return(bus = bus_resolve(bus), -ENOPKG);
4066 assert_return(!bus_pid_changed(bus), -ECHILD);
4067
4068 return bus->trusted;
4069 }
4070
4071 _public_ int sd_bus_is_monitor(sd_bus *bus) {
4072 assert_return(bus, -EINVAL);
4073 assert_return(bus = bus_resolve(bus), -ENOPKG);
4074 assert_return(!bus_pid_changed(bus), -ECHILD);
4075
4076 return bus->is_monitor;
4077 }
4078
4079 static void flush_close(sd_bus *bus) {
4080 if (!bus)
4081 return;
4082
4083 /* Flushes and closes the specified bus. We take a ref before,
4084 * to ensure the flushing does not cause the bus to be
4085 * unreferenced. */
4086
4087 sd_bus_flush_close_unref(sd_bus_ref(bus));
4088 }
4089
4090 _public_ void sd_bus_default_flush_close(void) {
4091 flush_close(default_starter_bus);
4092 flush_close(default_user_bus);
4093 flush_close(default_system_bus);
4094 }
4095
4096 _public_ int sd_bus_set_exit_on_disconnect(sd_bus *bus, int b) {
4097 assert_return(bus, -EINVAL);
4098 assert_return(bus = bus_resolve(bus), -ENOPKG);
4099
4100 /* Turns on exit-on-disconnect, and triggers it immediately if the bus connection was already
4101 * disconnected. Note that this is triggered exclusively on disconnections triggered by the server side, never
4102 * from the client side. */
4103 bus->exit_on_disconnect = b;
4104
4105 /* If the exit condition was triggered already, exit immediately. */
4106 return bus_exit_now(bus);
4107 }
4108
4109 _public_ int sd_bus_get_exit_on_disconnect(sd_bus *bus) {
4110 assert_return(bus, -EINVAL);
4111 assert_return(bus = bus_resolve(bus), -ENOPKG);
4112
4113 return bus->exit_on_disconnect;
4114 }
4115
4116 _public_ int sd_bus_set_sender(sd_bus *bus, const char *sender) {
4117 assert_return(bus, -EINVAL);
4118 assert_return(bus = bus_resolve(bus), -ENOPKG);
4119 assert_return(!bus->bus_client, -EPERM);
4120 assert_return(!sender || service_name_is_valid(sender), -EINVAL);
4121
4122 return free_and_strdup(&bus->patch_sender, sender);
4123 }
4124
4125 _public_ int sd_bus_get_sender(sd_bus *bus, const char **ret) {
4126 assert_return(bus, -EINVAL);
4127 assert_return(bus = bus_resolve(bus), -ENOPKG);
4128 assert_return(ret, -EINVAL);
4129
4130 if (!bus->patch_sender)
4131 return -ENODATA;
4132
4133 *ret = bus->patch_sender;
4134 return 0;
4135 }
4136
4137 _public_ int sd_bus_get_n_queued_read(sd_bus *bus, uint64_t *ret) {
4138 assert_return(bus, -EINVAL);
4139 assert_return(bus = bus_resolve(bus), -ENOPKG);
4140 assert_return(!bus_pid_changed(bus), -ECHILD);
4141 assert_return(ret, -EINVAL);
4142
4143 *ret = bus->rqueue_size;
4144 return 0;
4145 }
4146
4147 _public_ int sd_bus_get_n_queued_write(sd_bus *bus, uint64_t *ret) {
4148 assert_return(bus, -EINVAL);
4149 assert_return(bus = bus_resolve(bus), -ENOPKG);
4150 assert_return(!bus_pid_changed(bus), -ECHILD);
4151 assert_return(ret, -EINVAL);
4152
4153 *ret = bus->wqueue_size;
4154 return 0;
4155 }
4156
4157 _public_ int sd_bus_set_method_call_timeout(sd_bus *bus, uint64_t usec) {
4158 assert_return(bus, -EINVAL);
4159 assert_return(bus = bus_resolve(bus), -ENOPKG);
4160
4161 bus->method_call_timeout = usec;
4162 return 0;
4163 }
4164
4165 _public_ int sd_bus_get_method_call_timeout(sd_bus *bus, uint64_t *ret) {
4166 const char *e;
4167 usec_t usec;
4168
4169 assert_return(bus, -EINVAL);
4170 assert_return(bus = bus_resolve(bus), -ENOPKG);
4171 assert_return(ret, -EINVAL);
4172
4173 if (bus->method_call_timeout != 0) {
4174 *ret = bus->method_call_timeout;
4175 return 0;
4176 }
4177
4178 e = secure_getenv("SYSTEMD_BUS_TIMEOUT");
4179 if (e && parse_sec(e, &usec) >= 0 && usec != 0) {
4180 /* Save the parsed value to avoid multiple parsing. To change the timeout value,
4181 * use sd_bus_set_method_call_timeout() instead of setenv(). */
4182 *ret = bus->method_call_timeout = usec;
4183 return 0;
4184 }
4185
4186 *ret = bus->method_call_timeout = BUS_DEFAULT_TIMEOUT;
4187 return 0;
4188 }
4189
4190 _public_ int sd_bus_set_close_on_exit(sd_bus *bus, int b) {
4191 assert_return(bus, -EINVAL);
4192 assert_return(bus = bus_resolve(bus), -ENOPKG);
4193
4194 bus->close_on_exit = b;
4195 return 0;
4196 }
4197
4198 _public_ int sd_bus_get_close_on_exit(sd_bus *bus) {
4199 assert_return(bus, -EINVAL);
4200 assert_return(bus = bus_resolve(bus), -ENOPKG);
4201
4202 return bus->close_on_exit;
4203 }
4204
4205 _public_ int sd_bus_enqueue_for_read(sd_bus *bus, sd_bus_message *m) {
4206 int r;
4207
4208 assert_return(bus, -EINVAL);
4209 assert_return(bus = bus_resolve(bus), -ENOPKG);
4210 assert_return(m, -EINVAL);
4211 assert_return(m->sealed, -EINVAL);
4212 assert_return(!bus_pid_changed(bus), -ECHILD);
4213
4214 if (!BUS_IS_OPEN(bus->state))
4215 return -ENOTCONN;
4216
4217 /* Re-enqueue a message for reading. This is primarily useful for PolicyKit-style authentication,
4218 * where we accept a message, then determine we need to interactively authenticate the user, and then
4219 * we want to process the message again. */
4220
4221 r = bus_rqueue_make_room(bus);
4222 if (r < 0)
4223 return r;
4224
4225 bus->rqueue[bus->rqueue_size++] = bus_message_ref_queued(m, bus);
4226 return 0;
4227 }
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