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Merge pull request #857 from dvdhrm/proxy-reload
[thirdparty/systemd.git] / src / libsystemd / sd-bus / sd-bus.c
1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
2
3 /***
4 This file is part of systemd.
5
6 Copyright 2013 Lennart Poettering
7
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU Lesser General Public License as published by
10 the Free Software Foundation; either version 2.1 of the License, or
11 (at your option) any later version.
12
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 Lesser General Public License for more details.
17
18 You should have received a copy of the GNU Lesser General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
20 ***/
21
22 #include <endian.h>
23 #include <stdlib.h>
24 #include <unistd.h>
25 #include <netdb.h>
26 #include <poll.h>
27 #include <sys/mman.h>
28 #include <pthread.h>
29
30 #include "util.h"
31 #include "macro.h"
32 #include "strv.h"
33 #include "missing.h"
34 #include "def.h"
35 #include "cgroup-util.h"
36 #include "bus-label.h"
37
38 #include "sd-bus.h"
39 #include "bus-internal.h"
40 #include "bus-message.h"
41 #include "bus-type.h"
42 #include "bus-socket.h"
43 #include "bus-kernel.h"
44 #include "bus-control.h"
45 #include "bus-objects.h"
46 #include "bus-util.h"
47 #include "bus-container.h"
48 #include "bus-protocol.h"
49 #include "bus-track.h"
50 #include "bus-slot.h"
51
52 #define log_debug_bus_message(m) \
53 do { \
54 sd_bus_message *_mm = (m); \
55 log_debug("Got message type=%s sender=%s destination=%s object=%s interface=%s member=%s cookie=%" PRIu64 " reply_cookie=%" PRIu64 " error=%s", \
56 bus_message_type_to_string(_mm->header->type), \
57 strna(sd_bus_message_get_sender(_mm)), \
58 strna(sd_bus_message_get_destination(_mm)), \
59 strna(sd_bus_message_get_path(_mm)), \
60 strna(sd_bus_message_get_interface(_mm)), \
61 strna(sd_bus_message_get_member(_mm)), \
62 BUS_MESSAGE_COOKIE(_mm), \
63 _mm->reply_cookie, \
64 strna(_mm->error.message)); \
65 } while (false)
66
67 static int bus_poll(sd_bus *bus, bool need_more, uint64_t timeout_usec);
68 static int attach_io_events(sd_bus *b);
69 static void detach_io_events(sd_bus *b);
70
71 static void bus_close_fds(sd_bus *b) {
72 assert(b);
73
74 detach_io_events(b);
75
76 if (b->input_fd != b->output_fd)
77 safe_close(b->output_fd);
78 b->output_fd = b->input_fd = safe_close(b->input_fd);
79 }
80
81 static void bus_reset_queues(sd_bus *b) {
82 assert(b);
83
84 while (b->rqueue_size > 0)
85 sd_bus_message_unref(b->rqueue[--b->rqueue_size]);
86
87 b->rqueue = mfree(b->rqueue);
88 b->rqueue_allocated = 0;
89
90 while (b->wqueue_size > 0)
91 sd_bus_message_unref(b->wqueue[--b->wqueue_size]);
92
93 b->wqueue = mfree(b->wqueue);
94 b->wqueue_allocated = 0;
95 }
96
97 static void bus_free(sd_bus *b) {
98 sd_bus_slot *s;
99
100 assert(b);
101 assert(!b->track_queue);
102
103 b->state = BUS_CLOSED;
104
105 sd_bus_detach_event(b);
106
107 while ((s = b->slots)) {
108 /* At this point only floating slots can still be
109 * around, because the non-floating ones keep a
110 * reference to the bus, and we thus couldn't be
111 * destructing right now... We forcibly disconnect the
112 * slots here, so that they still can be referenced by
113 * apps, but are dead. */
114
115 assert(s->floating);
116 bus_slot_disconnect(s);
117 sd_bus_slot_unref(s);
118 }
119
120 if (b->default_bus_ptr)
121 *b->default_bus_ptr = NULL;
122
123 bus_close_fds(b);
124
125 if (b->kdbus_buffer)
126 munmap(b->kdbus_buffer, KDBUS_POOL_SIZE);
127
128 free(b->label);
129 free(b->rbuffer);
130 free(b->unique_name);
131 free(b->auth_buffer);
132 free(b->address);
133 free(b->kernel);
134 free(b->machine);
135 free(b->fake_label);
136 free(b->cgroup_root);
137 free(b->description);
138
139 free(b->exec_path);
140 strv_free(b->exec_argv);
141
142 close_many(b->fds, b->n_fds);
143 free(b->fds);
144
145 bus_reset_queues(b);
146
147 ordered_hashmap_free_free(b->reply_callbacks);
148 prioq_free(b->reply_callbacks_prioq);
149
150 assert(b->match_callbacks.type == BUS_MATCH_ROOT);
151 bus_match_free(&b->match_callbacks);
152
153 hashmap_free_free(b->vtable_methods);
154 hashmap_free_free(b->vtable_properties);
155
156 assert(hashmap_isempty(b->nodes));
157 hashmap_free(b->nodes);
158
159 bus_kernel_flush_memfd(b);
160
161 assert_se(pthread_mutex_destroy(&b->memfd_cache_mutex) == 0);
162
163 free(b);
164 }
165
166 _public_ int sd_bus_new(sd_bus **ret) {
167 sd_bus *r;
168
169 assert_return(ret, -EINVAL);
170
171 r = new0(sd_bus, 1);
172 if (!r)
173 return -ENOMEM;
174
175 r->n_ref = REFCNT_INIT;
176 r->input_fd = r->output_fd = -1;
177 r->message_version = 1;
178 r->creds_mask |= SD_BUS_CREDS_WELL_KNOWN_NAMES|SD_BUS_CREDS_UNIQUE_NAME;
179 r->hello_flags |= KDBUS_HELLO_ACCEPT_FD;
180 r->attach_flags |= KDBUS_ATTACH_NAMES;
181 r->original_pid = getpid();
182
183 assert_se(pthread_mutex_init(&r->memfd_cache_mutex, NULL) == 0);
184
185 /* We guarantee that wqueue always has space for at least one
186 * entry */
187 if (!GREEDY_REALLOC(r->wqueue, r->wqueue_allocated, 1)) {
188 free(r);
189 return -ENOMEM;
190 }
191
192 *ret = r;
193 return 0;
194 }
195
196 _public_ int sd_bus_set_address(sd_bus *bus, const char *address) {
197 char *a;
198
199 assert_return(bus, -EINVAL);
200 assert_return(bus->state == BUS_UNSET, -EPERM);
201 assert_return(address, -EINVAL);
202 assert_return(!bus_pid_changed(bus), -ECHILD);
203
204 a = strdup(address);
205 if (!a)
206 return -ENOMEM;
207
208 free(bus->address);
209 bus->address = a;
210
211 return 0;
212 }
213
214 _public_ int sd_bus_set_fd(sd_bus *bus, int input_fd, int output_fd) {
215 assert_return(bus, -EINVAL);
216 assert_return(bus->state == BUS_UNSET, -EPERM);
217 assert_return(input_fd >= 0, -EINVAL);
218 assert_return(output_fd >= 0, -EINVAL);
219 assert_return(!bus_pid_changed(bus), -ECHILD);
220
221 bus->input_fd = input_fd;
222 bus->output_fd = output_fd;
223 return 0;
224 }
225
226 _public_ int sd_bus_set_exec(sd_bus *bus, const char *path, char *const argv[]) {
227 char *p, **a;
228
229 assert_return(bus, -EINVAL);
230 assert_return(bus->state == BUS_UNSET, -EPERM);
231 assert_return(path, -EINVAL);
232 assert_return(!strv_isempty(argv), -EINVAL);
233 assert_return(!bus_pid_changed(bus), -ECHILD);
234
235 p = strdup(path);
236 if (!p)
237 return -ENOMEM;
238
239 a = strv_copy(argv);
240 if (!a) {
241 free(p);
242 return -ENOMEM;
243 }
244
245 free(bus->exec_path);
246 strv_free(bus->exec_argv);
247
248 bus->exec_path = p;
249 bus->exec_argv = a;
250
251 return 0;
252 }
253
254 _public_ int sd_bus_set_bus_client(sd_bus *bus, int b) {
255 assert_return(bus, -EINVAL);
256 assert_return(bus->state == BUS_UNSET, -EPERM);
257 assert_return(!bus_pid_changed(bus), -ECHILD);
258
259 bus->bus_client = !!b;
260 return 0;
261 }
262
263 _public_ int sd_bus_set_monitor(sd_bus *bus, int b) {
264 assert_return(bus, -EINVAL);
265 assert_return(bus->state == BUS_UNSET, -EPERM);
266 assert_return(!bus_pid_changed(bus), -ECHILD);
267
268 SET_FLAG(bus->hello_flags, KDBUS_HELLO_MONITOR, b);
269 return 0;
270 }
271
272 _public_ int sd_bus_negotiate_fds(sd_bus *bus, int b) {
273 assert_return(bus, -EINVAL);
274 assert_return(bus->state == BUS_UNSET, -EPERM);
275 assert_return(!bus_pid_changed(bus), -ECHILD);
276
277 SET_FLAG(bus->hello_flags, KDBUS_HELLO_ACCEPT_FD, b);
278 return 0;
279 }
280
281 _public_ int sd_bus_negotiate_timestamp(sd_bus *bus, int b) {
282 uint64_t new_flags;
283 assert_return(bus, -EINVAL);
284 assert_return(!IN_SET(bus->state, BUS_CLOSING, BUS_CLOSED), -EPERM);
285 assert_return(!bus_pid_changed(bus), -ECHILD);
286
287 new_flags = bus->attach_flags;
288 SET_FLAG(new_flags, KDBUS_ATTACH_TIMESTAMP, b);
289
290 if (bus->attach_flags == new_flags)
291 return 0;
292
293 bus->attach_flags = new_flags;
294 if (bus->state != BUS_UNSET && bus->is_kernel)
295 bus_kernel_realize_attach_flags(bus);
296
297 return 0;
298 }
299
300 _public_ int sd_bus_negotiate_creds(sd_bus *bus, int b, uint64_t mask) {
301 uint64_t new_flags;
302
303 assert_return(bus, -EINVAL);
304 assert_return(mask <= _SD_BUS_CREDS_ALL, -EINVAL);
305 assert_return(!IN_SET(bus->state, BUS_CLOSING, BUS_CLOSED), -EPERM);
306 assert_return(!bus_pid_changed(bus), -ECHILD);
307
308 if (b)
309 bus->creds_mask |= mask;
310 else
311 bus->creds_mask &= ~mask;
312
313 /* The well knowns we need unconditionally, so that matches can work */
314 bus->creds_mask |= SD_BUS_CREDS_WELL_KNOWN_NAMES|SD_BUS_CREDS_UNIQUE_NAME;
315
316 /* Make sure we don't lose the timestamp flag */
317 new_flags = (bus->attach_flags & KDBUS_ATTACH_TIMESTAMP) | attach_flags_to_kdbus(bus->creds_mask);
318 if (bus->attach_flags == new_flags)
319 return 0;
320
321 bus->attach_flags = new_flags;
322 if (bus->state != BUS_UNSET && bus->is_kernel)
323 bus_kernel_realize_attach_flags(bus);
324
325 return 0;
326 }
327
328 _public_ int sd_bus_set_server(sd_bus *bus, int b, sd_id128_t server_id) {
329 assert_return(bus, -EINVAL);
330 assert_return(b || sd_id128_equal(server_id, SD_ID128_NULL), -EINVAL);
331 assert_return(bus->state == BUS_UNSET, -EPERM);
332 assert_return(!bus_pid_changed(bus), -ECHILD);
333
334 bus->is_server = !!b;
335 bus->server_id = server_id;
336 return 0;
337 }
338
339 _public_ int sd_bus_set_anonymous(sd_bus *bus, int b) {
340 assert_return(bus, -EINVAL);
341 assert_return(bus->state == BUS_UNSET, -EPERM);
342 assert_return(!bus_pid_changed(bus), -ECHILD);
343
344 bus->anonymous_auth = !!b;
345 return 0;
346 }
347
348 _public_ int sd_bus_set_trusted(sd_bus *bus, int b) {
349 assert_return(bus, -EINVAL);
350 assert_return(bus->state == BUS_UNSET, -EPERM);
351 assert_return(!bus_pid_changed(bus), -ECHILD);
352
353 bus->trusted = !!b;
354 return 0;
355 }
356
357 _public_ int sd_bus_set_description(sd_bus *bus, const char *description) {
358 assert_return(bus, -EINVAL);
359 assert_return(bus->state == BUS_UNSET, -EPERM);
360 assert_return(!bus_pid_changed(bus), -ECHILD);
361
362 return free_and_strdup(&bus->description, description);
363 }
364
365 _public_ int sd_bus_set_allow_interactive_authorization(sd_bus *bus, int b) {
366 assert_return(bus, -EINVAL);
367 assert_return(!bus_pid_changed(bus), -ECHILD);
368
369 bus->allow_interactive_authorization = !!b;
370 return 0;
371 }
372
373 _public_ int sd_bus_get_allow_interactive_authorization(sd_bus *bus) {
374 assert_return(bus, -EINVAL);
375 assert_return(!bus_pid_changed(bus), -ECHILD);
376
377 return bus->allow_interactive_authorization;
378 }
379
380 static int hello_callback(sd_bus_message *reply, void *userdata, sd_bus_error *error) {
381 const char *s;
382 sd_bus *bus;
383 int r;
384
385 assert(reply);
386 bus = reply->bus;
387 assert(bus);
388 assert(bus->state == BUS_HELLO || bus->state == BUS_CLOSING);
389
390 r = sd_bus_message_get_errno(reply);
391 if (r > 0)
392 return -r;
393
394 r = sd_bus_message_read(reply, "s", &s);
395 if (r < 0)
396 return r;
397
398 if (!service_name_is_valid(s) || s[0] != ':')
399 return -EBADMSG;
400
401 bus->unique_name = strdup(s);
402 if (!bus->unique_name)
403 return -ENOMEM;
404
405 if (bus->state == BUS_HELLO)
406 bus->state = BUS_RUNNING;
407
408 return 1;
409 }
410
411 static int bus_send_hello(sd_bus *bus) {
412 _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
413 int r;
414
415 assert(bus);
416
417 if (!bus->bus_client || bus->is_kernel)
418 return 0;
419
420 r = sd_bus_message_new_method_call(
421 bus,
422 &m,
423 "org.freedesktop.DBus",
424 "/org/freedesktop/DBus",
425 "org.freedesktop.DBus",
426 "Hello");
427 if (r < 0)
428 return r;
429
430 return sd_bus_call_async(bus, NULL, m, hello_callback, NULL, 0);
431 }
432
433 int bus_start_running(sd_bus *bus) {
434 assert(bus);
435
436 if (bus->bus_client && !bus->is_kernel) {
437 bus->state = BUS_HELLO;
438 return 1;
439 }
440
441 bus->state = BUS_RUNNING;
442 return 1;
443 }
444
445 static int parse_address_key(const char **p, const char *key, char **value) {
446 size_t l, n = 0, allocated = 0;
447 const char *a;
448 char *r = NULL;
449
450 assert(p);
451 assert(*p);
452 assert(value);
453
454 if (key) {
455 l = strlen(key);
456 if (strncmp(*p, key, l) != 0)
457 return 0;
458
459 if ((*p)[l] != '=')
460 return 0;
461
462 if (*value)
463 return -EINVAL;
464
465 a = *p + l + 1;
466 } else
467 a = *p;
468
469 while (*a != ';' && *a != ',' && *a != 0) {
470 char c;
471
472 if (*a == '%') {
473 int x, y;
474
475 x = unhexchar(a[1]);
476 if (x < 0) {
477 free(r);
478 return x;
479 }
480
481 y = unhexchar(a[2]);
482 if (y < 0) {
483 free(r);
484 return y;
485 }
486
487 c = (char) ((x << 4) | y);
488 a += 3;
489 } else {
490 c = *a;
491 a++;
492 }
493
494 if (!GREEDY_REALLOC(r, allocated, n + 2))
495 return -ENOMEM;
496
497 r[n++] = c;
498 }
499
500 if (!r) {
501 r = strdup("");
502 if (!r)
503 return -ENOMEM;
504 } else
505 r[n] = 0;
506
507 if (*a == ',')
508 a++;
509
510 *p = a;
511
512 free(*value);
513 *value = r;
514
515 return 1;
516 }
517
518 static void skip_address_key(const char **p) {
519 assert(p);
520 assert(*p);
521
522 *p += strcspn(*p, ",");
523
524 if (**p == ',')
525 (*p) ++;
526 }
527
528 static int parse_unix_address(sd_bus *b, const char **p, char **guid) {
529 _cleanup_free_ char *path = NULL, *abstract = NULL;
530 size_t l;
531 int r;
532
533 assert(b);
534 assert(p);
535 assert(*p);
536 assert(guid);
537
538 while (**p != 0 && **p != ';') {
539 r = parse_address_key(p, "guid", guid);
540 if (r < 0)
541 return r;
542 else if (r > 0)
543 continue;
544
545 r = parse_address_key(p, "path", &path);
546 if (r < 0)
547 return r;
548 else if (r > 0)
549 continue;
550
551 r = parse_address_key(p, "abstract", &abstract);
552 if (r < 0)
553 return r;
554 else if (r > 0)
555 continue;
556
557 skip_address_key(p);
558 }
559
560 if (!path && !abstract)
561 return -EINVAL;
562
563 if (path && abstract)
564 return -EINVAL;
565
566 if (path) {
567 l = strlen(path);
568 if (l > sizeof(b->sockaddr.un.sun_path))
569 return -E2BIG;
570
571 b->sockaddr.un.sun_family = AF_UNIX;
572 strncpy(b->sockaddr.un.sun_path, path, sizeof(b->sockaddr.un.sun_path));
573 b->sockaddr_size = offsetof(struct sockaddr_un, sun_path) + l;
574 } else if (abstract) {
575 l = strlen(abstract);
576 if (l > sizeof(b->sockaddr.un.sun_path) - 1)
577 return -E2BIG;
578
579 b->sockaddr.un.sun_family = AF_UNIX;
580 b->sockaddr.un.sun_path[0] = 0;
581 strncpy(b->sockaddr.un.sun_path+1, abstract, sizeof(b->sockaddr.un.sun_path)-1);
582 b->sockaddr_size = offsetof(struct sockaddr_un, sun_path) + 1 + l;
583 }
584
585 return 0;
586 }
587
588 static int parse_tcp_address(sd_bus *b, const char **p, char **guid) {
589 _cleanup_free_ char *host = NULL, *port = NULL, *family = NULL;
590 int r;
591 struct addrinfo *result, hints = {
592 .ai_socktype = SOCK_STREAM,
593 .ai_flags = AI_ADDRCONFIG,
594 };
595
596 assert(b);
597 assert(p);
598 assert(*p);
599 assert(guid);
600
601 while (**p != 0 && **p != ';') {
602 r = parse_address_key(p, "guid", guid);
603 if (r < 0)
604 return r;
605 else if (r > 0)
606 continue;
607
608 r = parse_address_key(p, "host", &host);
609 if (r < 0)
610 return r;
611 else if (r > 0)
612 continue;
613
614 r = parse_address_key(p, "port", &port);
615 if (r < 0)
616 return r;
617 else if (r > 0)
618 continue;
619
620 r = parse_address_key(p, "family", &family);
621 if (r < 0)
622 return r;
623 else if (r > 0)
624 continue;
625
626 skip_address_key(p);
627 }
628
629 if (!host || !port)
630 return -EINVAL;
631
632 if (family) {
633 if (streq(family, "ipv4"))
634 hints.ai_family = AF_INET;
635 else if (streq(family, "ipv6"))
636 hints.ai_family = AF_INET6;
637 else
638 return -EINVAL;
639 }
640
641 r = getaddrinfo(host, port, &hints, &result);
642 if (r == EAI_SYSTEM)
643 return -errno;
644 else if (r != 0)
645 return -EADDRNOTAVAIL;
646
647 memcpy(&b->sockaddr, result->ai_addr, result->ai_addrlen);
648 b->sockaddr_size = result->ai_addrlen;
649
650 freeaddrinfo(result);
651
652 return 0;
653 }
654
655 static int parse_exec_address(sd_bus *b, const char **p, char **guid) {
656 char *path = NULL;
657 unsigned n_argv = 0, j;
658 char **argv = NULL;
659 size_t allocated = 0;
660 int r;
661
662 assert(b);
663 assert(p);
664 assert(*p);
665 assert(guid);
666
667 while (**p != 0 && **p != ';') {
668 r = parse_address_key(p, "guid", guid);
669 if (r < 0)
670 goto fail;
671 else if (r > 0)
672 continue;
673
674 r = parse_address_key(p, "path", &path);
675 if (r < 0)
676 goto fail;
677 else if (r > 0)
678 continue;
679
680 if (startswith(*p, "argv")) {
681 unsigned ul;
682
683 errno = 0;
684 ul = strtoul(*p + 4, (char**) p, 10);
685 if (errno > 0 || **p != '=' || ul > 256) {
686 r = -EINVAL;
687 goto fail;
688 }
689
690 (*p) ++;
691
692 if (ul >= n_argv) {
693 if (!GREEDY_REALLOC0(argv, allocated, ul + 2)) {
694 r = -ENOMEM;
695 goto fail;
696 }
697
698 n_argv = ul + 1;
699 }
700
701 r = parse_address_key(p, NULL, argv + ul);
702 if (r < 0)
703 goto fail;
704
705 continue;
706 }
707
708 skip_address_key(p);
709 }
710
711 if (!path) {
712 r = -EINVAL;
713 goto fail;
714 }
715
716 /* Make sure there are no holes in the array, with the
717 * exception of argv[0] */
718 for (j = 1; j < n_argv; j++)
719 if (!argv[j]) {
720 r = -EINVAL;
721 goto fail;
722 }
723
724 if (argv && argv[0] == NULL) {
725 argv[0] = strdup(path);
726 if (!argv[0]) {
727 r = -ENOMEM;
728 goto fail;
729 }
730 }
731
732 b->exec_path = path;
733 b->exec_argv = argv;
734 return 0;
735
736 fail:
737 for (j = 0; j < n_argv; j++)
738 free(argv[j]);
739
740 free(argv);
741 free(path);
742 return r;
743 }
744
745 static int parse_kernel_address(sd_bus *b, const char **p, char **guid) {
746 _cleanup_free_ char *path = NULL;
747 int r;
748
749 assert(b);
750 assert(p);
751 assert(*p);
752 assert(guid);
753
754 while (**p != 0 && **p != ';') {
755 r = parse_address_key(p, "guid", guid);
756 if (r < 0)
757 return r;
758 else if (r > 0)
759 continue;
760
761 r = parse_address_key(p, "path", &path);
762 if (r < 0)
763 return r;
764 else if (r > 0)
765 continue;
766
767 skip_address_key(p);
768 }
769
770 if (!path)
771 return -EINVAL;
772
773 free(b->kernel);
774 b->kernel = path;
775 path = NULL;
776
777 return 0;
778 }
779
780 static int parse_container_unix_address(sd_bus *b, const char **p, char **guid) {
781 _cleanup_free_ char *machine = NULL, *pid = NULL;
782 int r;
783
784 assert(b);
785 assert(p);
786 assert(*p);
787 assert(guid);
788
789 while (**p != 0 && **p != ';') {
790 r = parse_address_key(p, "guid", guid);
791 if (r < 0)
792 return r;
793 else if (r > 0)
794 continue;
795
796 r = parse_address_key(p, "machine", &machine);
797 if (r < 0)
798 return r;
799 else if (r > 0)
800 continue;
801
802 r = parse_address_key(p, "pid", &pid);
803 if (r < 0)
804 return r;
805 else if (r > 0)
806 continue;
807
808 skip_address_key(p);
809 }
810
811 if (!machine == !pid)
812 return -EINVAL;
813
814 if (machine) {
815 if (!machine_name_is_valid(machine))
816 return -EINVAL;
817
818 free(b->machine);
819 b->machine = machine;
820 machine = NULL;
821 } else {
822 free(b->machine);
823 b->machine = NULL;
824 }
825
826 if (pid) {
827 r = parse_pid(pid, &b->nspid);
828 if (r < 0)
829 return r;
830 } else
831 b->nspid = 0;
832
833 b->sockaddr.un.sun_family = AF_UNIX;
834 strncpy(b->sockaddr.un.sun_path, "/var/run/dbus/system_bus_socket", sizeof(b->sockaddr.un.sun_path));
835 b->sockaddr_size = offsetof(struct sockaddr_un, sun_path) + strlen("/var/run/dbus/system_bus_socket");
836
837 return 0;
838 }
839
840 static int parse_container_kernel_address(sd_bus *b, const char **p, char **guid) {
841 _cleanup_free_ char *machine = NULL, *pid = NULL;
842 int r;
843
844 assert(b);
845 assert(p);
846 assert(*p);
847 assert(guid);
848
849 while (**p != 0 && **p != ';') {
850 r = parse_address_key(p, "guid", guid);
851 if (r < 0)
852 return r;
853 else if (r > 0)
854 continue;
855
856 r = parse_address_key(p, "machine", &machine);
857 if (r < 0)
858 return r;
859 else if (r > 0)
860 continue;
861
862 r = parse_address_key(p, "pid", &pid);
863 if (r < 0)
864 return r;
865 else if (r > 0)
866 continue;
867
868 skip_address_key(p);
869 }
870
871 if (!machine == !pid)
872 return -EINVAL;
873
874 if (machine) {
875 if (!machine_name_is_valid(machine))
876 return -EINVAL;
877
878 free(b->machine);
879 b->machine = machine;
880 machine = NULL;
881 } else {
882 free(b->machine);
883 b->machine = NULL;
884 }
885
886 if (pid) {
887 r = parse_pid(pid, &b->nspid);
888 if (r < 0)
889 return r;
890 } else
891 b->nspid = 0;
892
893 r = free_and_strdup(&b->kernel, "/sys/fs/kdbus/0-system/bus");
894 if (r < 0)
895 return r;
896
897 return 0;
898 }
899
900 static void bus_reset_parsed_address(sd_bus *b) {
901 assert(b);
902
903 zero(b->sockaddr);
904 b->sockaddr_size = 0;
905 b->exec_argv = strv_free(b->exec_argv);
906 b->exec_path = mfree(b->exec_path);
907 b->server_id = SD_ID128_NULL;
908 b->kernel = mfree(b->kernel);
909 b->machine = mfree(b->machine);
910 b->nspid = 0;
911 }
912
913 static int bus_parse_next_address(sd_bus *b) {
914 _cleanup_free_ char *guid = NULL;
915 const char *a;
916 int r;
917
918 assert(b);
919
920 if (!b->address)
921 return 0;
922 if (b->address[b->address_index] == 0)
923 return 0;
924
925 bus_reset_parsed_address(b);
926
927 a = b->address + b->address_index;
928
929 while (*a != 0) {
930
931 if (*a == ';') {
932 a++;
933 continue;
934 }
935
936 if (startswith(a, "unix:")) {
937 a += 5;
938
939 r = parse_unix_address(b, &a, &guid);
940 if (r < 0)
941 return r;
942 break;
943
944 } else if (startswith(a, "tcp:")) {
945
946 a += 4;
947 r = parse_tcp_address(b, &a, &guid);
948 if (r < 0)
949 return r;
950
951 break;
952
953 } else if (startswith(a, "unixexec:")) {
954
955 a += 9;
956 r = parse_exec_address(b, &a, &guid);
957 if (r < 0)
958 return r;
959
960 break;
961
962 } else if (startswith(a, "kernel:")) {
963
964 a += 7;
965 r = parse_kernel_address(b, &a, &guid);
966 if (r < 0)
967 return r;
968
969 break;
970 } else if (startswith(a, "x-machine-unix:")) {
971
972 a += 15;
973 r = parse_container_unix_address(b, &a, &guid);
974 if (r < 0)
975 return r;
976
977 break;
978 } else if (startswith(a, "x-machine-kernel:")) {
979
980 a += 17;
981 r = parse_container_kernel_address(b, &a, &guid);
982 if (r < 0)
983 return r;
984
985 break;
986 }
987
988 a = strchr(a, ';');
989 if (!a)
990 return 0;
991 }
992
993 if (guid) {
994 r = sd_id128_from_string(guid, &b->server_id);
995 if (r < 0)
996 return r;
997 }
998
999 b->address_index = a - b->address;
1000 return 1;
1001 }
1002
1003 static int bus_start_address(sd_bus *b) {
1004 int r;
1005
1006 assert(b);
1007
1008 for (;;) {
1009 bool skipped = false;
1010
1011 bus_close_fds(b);
1012
1013 if (b->exec_path)
1014 r = bus_socket_exec(b);
1015 else if ((b->nspid > 0 || b->machine) && b->kernel)
1016 r = bus_container_connect_kernel(b);
1017 else if ((b->nspid > 0 || b->machine) && b->sockaddr.sa.sa_family != AF_UNSPEC)
1018 r = bus_container_connect_socket(b);
1019 else if (b->kernel)
1020 r = bus_kernel_connect(b);
1021 else if (b->sockaddr.sa.sa_family != AF_UNSPEC)
1022 r = bus_socket_connect(b);
1023 else
1024 skipped = true;
1025
1026 if (!skipped) {
1027 if (r >= 0) {
1028 r = attach_io_events(b);
1029 if (r >= 0)
1030 return r;
1031 }
1032
1033 b->last_connect_error = -r;
1034 }
1035
1036 r = bus_parse_next_address(b);
1037 if (r < 0)
1038 return r;
1039 if (r == 0)
1040 return b->last_connect_error ? -b->last_connect_error : -ECONNREFUSED;
1041 }
1042 }
1043
1044 int bus_next_address(sd_bus *b) {
1045 assert(b);
1046
1047 bus_reset_parsed_address(b);
1048 return bus_start_address(b);
1049 }
1050
1051 static int bus_start_fd(sd_bus *b) {
1052 struct stat st;
1053 int r;
1054
1055 assert(b);
1056 assert(b->input_fd >= 0);
1057 assert(b->output_fd >= 0);
1058
1059 r = fd_nonblock(b->input_fd, true);
1060 if (r < 0)
1061 return r;
1062
1063 r = fd_cloexec(b->input_fd, true);
1064 if (r < 0)
1065 return r;
1066
1067 if (b->input_fd != b->output_fd) {
1068 r = fd_nonblock(b->output_fd, true);
1069 if (r < 0)
1070 return r;
1071
1072 r = fd_cloexec(b->output_fd, true);
1073 if (r < 0)
1074 return r;
1075 }
1076
1077 if (fstat(b->input_fd, &st) < 0)
1078 return -errno;
1079
1080 if (S_ISCHR(b->input_fd))
1081 return bus_kernel_take_fd(b);
1082 else
1083 return bus_socket_take_fd(b);
1084 }
1085
1086 _public_ int sd_bus_start(sd_bus *bus) {
1087 int r;
1088
1089 assert_return(bus, -EINVAL);
1090 assert_return(bus->state == BUS_UNSET, -EPERM);
1091 assert_return(!bus_pid_changed(bus), -ECHILD);
1092
1093 bus->state = BUS_OPENING;
1094
1095 if (bus->is_server && bus->bus_client)
1096 return -EINVAL;
1097
1098 if (bus->input_fd >= 0)
1099 r = bus_start_fd(bus);
1100 else if (bus->address || bus->sockaddr.sa.sa_family != AF_UNSPEC || bus->exec_path || bus->kernel || bus->machine)
1101 r = bus_start_address(bus);
1102 else
1103 return -EINVAL;
1104
1105 if (r < 0) {
1106 sd_bus_close(bus);
1107 return r;
1108 }
1109
1110 return bus_send_hello(bus);
1111 }
1112
1113 _public_ int sd_bus_open(sd_bus **ret) {
1114 const char *e;
1115 sd_bus *b;
1116 int r;
1117
1118 assert_return(ret, -EINVAL);
1119
1120 /* Let's connect to the starter bus if it is set, and
1121 * otherwise to the bus that is appropropriate for the scope
1122 * we are running in */
1123
1124 e = secure_getenv("DBUS_STARTER_BUS_TYPE");
1125 if (e) {
1126 if (streq(e, "system"))
1127 return sd_bus_open_system(ret);
1128 else if (STR_IN_SET(e, "session", "user"))
1129 return sd_bus_open_user(ret);
1130 }
1131
1132 e = secure_getenv("DBUS_STARTER_ADDRESS");
1133 if (!e) {
1134 if (cg_pid_get_owner_uid(0, NULL) >= 0)
1135 return sd_bus_open_user(ret);
1136 else
1137 return sd_bus_open_system(ret);
1138 }
1139
1140 r = sd_bus_new(&b);
1141 if (r < 0)
1142 return r;
1143
1144 r = sd_bus_set_address(b, e);
1145 if (r < 0)
1146 goto fail;
1147
1148 b->bus_client = true;
1149
1150 /* We don't know whether the bus is trusted or not, so better
1151 * be safe, and authenticate everything */
1152 b->trusted = false;
1153 b->attach_flags |= KDBUS_ATTACH_CAPS | KDBUS_ATTACH_CREDS;
1154 b->creds_mask |= SD_BUS_CREDS_UID | SD_BUS_CREDS_EUID | SD_BUS_CREDS_EFFECTIVE_CAPS;
1155
1156 r = sd_bus_start(b);
1157 if (r < 0)
1158 goto fail;
1159
1160 *ret = b;
1161 return 0;
1162
1163 fail:
1164 bus_free(b);
1165 return r;
1166 }
1167
1168 int bus_set_address_system(sd_bus *b) {
1169 const char *e;
1170 assert(b);
1171
1172 e = secure_getenv("DBUS_SYSTEM_BUS_ADDRESS");
1173 if (e)
1174 return sd_bus_set_address(b, e);
1175
1176 return sd_bus_set_address(b, DEFAULT_SYSTEM_BUS_ADDRESS);
1177 }
1178
1179 _public_ int sd_bus_open_system(sd_bus **ret) {
1180 sd_bus *b;
1181 int r;
1182
1183 assert_return(ret, -EINVAL);
1184
1185 r = sd_bus_new(&b);
1186 if (r < 0)
1187 return r;
1188
1189 r = bus_set_address_system(b);
1190 if (r < 0)
1191 goto fail;
1192
1193 b->bus_client = true;
1194 b->is_system = true;
1195
1196 /* Let's do per-method access control on the system bus. We
1197 * need the caller's UID and capability set for that. */
1198 b->trusted = false;
1199 b->attach_flags |= KDBUS_ATTACH_CAPS | KDBUS_ATTACH_CREDS;
1200 b->creds_mask |= SD_BUS_CREDS_UID | SD_BUS_CREDS_EUID | SD_BUS_CREDS_EFFECTIVE_CAPS;
1201
1202 r = sd_bus_start(b);
1203 if (r < 0)
1204 goto fail;
1205
1206 *ret = b;
1207 return 0;
1208
1209 fail:
1210 bus_free(b);
1211 return r;
1212 }
1213
1214 int bus_set_address_user(sd_bus *b) {
1215 const char *e;
1216
1217 assert(b);
1218
1219 e = secure_getenv("DBUS_SESSION_BUS_ADDRESS");
1220 if (e)
1221 return sd_bus_set_address(b, e);
1222
1223 e = secure_getenv("XDG_RUNTIME_DIR");
1224 if (e) {
1225 _cleanup_free_ char *ee = NULL;
1226
1227 ee = bus_address_escape(e);
1228 if (!ee)
1229 return -ENOMEM;
1230
1231 (void) asprintf(&b->address, KERNEL_USER_BUS_ADDRESS_FMT ";" UNIX_USER_BUS_ADDRESS_FMT, getuid(), ee);
1232 } else
1233 (void) asprintf(&b->address, KERNEL_USER_BUS_ADDRESS_FMT, getuid());
1234
1235 if (!b->address)
1236 return -ENOMEM;
1237
1238 return 0;
1239 }
1240
1241 _public_ int sd_bus_open_user(sd_bus **ret) {
1242 sd_bus *b;
1243 int r;
1244
1245 assert_return(ret, -EINVAL);
1246
1247 r = sd_bus_new(&b);
1248 if (r < 0)
1249 return r;
1250
1251 r = bus_set_address_user(b);
1252 if (r < 0)
1253 return r;
1254
1255 b->bus_client = true;
1256 b->is_user = true;
1257
1258 /* We don't do any per-method access control on the user
1259 * bus. */
1260 b->trusted = true;
1261
1262 r = sd_bus_start(b);
1263 if (r < 0)
1264 goto fail;
1265
1266 *ret = b;
1267 return 0;
1268
1269 fail:
1270 bus_free(b);
1271 return r;
1272 }
1273
1274 int bus_set_address_system_remote(sd_bus *b, const char *host) {
1275 _cleanup_free_ char *e = NULL;
1276 char *m = NULL, *c = NULL;
1277
1278 assert(b);
1279 assert(host);
1280
1281 /* Let's see if we shall enter some container */
1282 m = strchr(host, ':');
1283 if (m) {
1284 m++;
1285
1286 /* Let's make sure this is not a port of some kind,
1287 * and is a valid machine name. */
1288 if (!in_charset(m, "0123456789") && machine_name_is_valid(m)) {
1289 char *t;
1290
1291 /* Cut out the host part */
1292 t = strndupa(host, m - host - 1);
1293 e = bus_address_escape(t);
1294 if (!e)
1295 return -ENOMEM;
1296
1297 c = strjoina(",argv4=--machine=", m);
1298 }
1299 }
1300
1301 if (!e) {
1302 e = bus_address_escape(host);
1303 if (!e)
1304 return -ENOMEM;
1305 }
1306
1307 b->address = strjoin("unixexec:path=ssh,argv1=-xT,argv2=", e, ",argv3=systemd-stdio-bridge", c, NULL);
1308 if (!b->address)
1309 return -ENOMEM;
1310
1311 return 0;
1312 }
1313
1314 _public_ int sd_bus_open_system_remote(sd_bus **ret, const char *host) {
1315 sd_bus *bus;
1316 int r;
1317
1318 assert_return(host, -EINVAL);
1319 assert_return(ret, -EINVAL);
1320
1321 r = sd_bus_new(&bus);
1322 if (r < 0)
1323 return r;
1324
1325 r = bus_set_address_system_remote(bus, host);
1326 if (r < 0)
1327 goto fail;
1328
1329 bus->bus_client = true;
1330 bus->trusted = false;
1331 bus->is_system = true;
1332
1333 r = sd_bus_start(bus);
1334 if (r < 0)
1335 goto fail;
1336
1337 *ret = bus;
1338 return 0;
1339
1340 fail:
1341 bus_free(bus);
1342 return r;
1343 }
1344
1345 int bus_set_address_system_machine(sd_bus *b, const char *machine) {
1346 _cleanup_free_ char *e = NULL;
1347
1348 assert(b);
1349 assert(machine);
1350
1351 e = bus_address_escape(machine);
1352 if (!e)
1353 return -ENOMEM;
1354
1355 b->address = strjoin("x-machine-kernel:machine=", e, ";x-machine-unix:machine=", e, NULL);
1356 if (!b->address)
1357 return -ENOMEM;
1358
1359 return 0;
1360 }
1361
1362 _public_ int sd_bus_open_system_machine(sd_bus **ret, const char *machine) {
1363 sd_bus *bus;
1364 int r;
1365
1366 assert_return(machine, -EINVAL);
1367 assert_return(ret, -EINVAL);
1368 assert_return(machine_name_is_valid(machine), -EINVAL);
1369
1370 r = sd_bus_new(&bus);
1371 if (r < 0)
1372 return r;
1373
1374 r = bus_set_address_system_machine(bus, machine);
1375 if (r < 0)
1376 goto fail;
1377
1378 bus->bus_client = true;
1379 bus->trusted = false;
1380 bus->is_system = true;
1381
1382 r = sd_bus_start(bus);
1383 if (r < 0)
1384 goto fail;
1385
1386 *ret = bus;
1387 return 0;
1388
1389 fail:
1390 bus_free(bus);
1391 return r;
1392 }
1393
1394 _public_ void sd_bus_close(sd_bus *bus) {
1395
1396 if (!bus)
1397 return;
1398 if (bus->state == BUS_CLOSED)
1399 return;
1400 if (bus_pid_changed(bus))
1401 return;
1402
1403 bus->state = BUS_CLOSED;
1404
1405 sd_bus_detach_event(bus);
1406
1407 /* Drop all queued messages so that they drop references to
1408 * the bus object and the bus may be freed */
1409 bus_reset_queues(bus);
1410
1411 if (!bus->is_kernel)
1412 bus_close_fds(bus);
1413
1414 /* We'll leave the fd open in case this is a kernel bus, since
1415 * there might still be memblocks around that reference this
1416 * bus, and they might need to invoke the KDBUS_CMD_FREE
1417 * ioctl on the fd when they are freed. */
1418 }
1419
1420 _public_ sd_bus* sd_bus_flush_close_unref(sd_bus *bus) {
1421
1422 if (!bus)
1423 return NULL;
1424
1425 sd_bus_flush(bus);
1426 sd_bus_close(bus);
1427
1428 return sd_bus_unref(bus);
1429 }
1430
1431 static void bus_enter_closing(sd_bus *bus) {
1432 assert(bus);
1433
1434 if (bus->state != BUS_OPENING &&
1435 bus->state != BUS_AUTHENTICATING &&
1436 bus->state != BUS_HELLO &&
1437 bus->state != BUS_RUNNING)
1438 return;
1439
1440 bus->state = BUS_CLOSING;
1441 }
1442
1443 _public_ sd_bus *sd_bus_ref(sd_bus *bus) {
1444 assert_return(bus, NULL);
1445
1446 assert_se(REFCNT_INC(bus->n_ref) >= 2);
1447
1448 return bus;
1449 }
1450
1451 _public_ sd_bus *sd_bus_unref(sd_bus *bus) {
1452 unsigned i;
1453
1454 if (!bus)
1455 return NULL;
1456
1457 i = REFCNT_DEC(bus->n_ref);
1458 if (i > 0)
1459 return NULL;
1460
1461 bus_free(bus);
1462 return NULL;
1463 }
1464
1465 _public_ int sd_bus_is_open(sd_bus *bus) {
1466
1467 assert_return(bus, -EINVAL);
1468 assert_return(!bus_pid_changed(bus), -ECHILD);
1469
1470 return BUS_IS_OPEN(bus->state);
1471 }
1472
1473 _public_ int sd_bus_can_send(sd_bus *bus, char type) {
1474 int r;
1475
1476 assert_return(bus, -EINVAL);
1477 assert_return(bus->state != BUS_UNSET, -ENOTCONN);
1478 assert_return(!bus_pid_changed(bus), -ECHILD);
1479
1480 if (bus->hello_flags & KDBUS_HELLO_MONITOR)
1481 return 0;
1482
1483 if (type == SD_BUS_TYPE_UNIX_FD) {
1484 if (!(bus->hello_flags & KDBUS_HELLO_ACCEPT_FD))
1485 return 0;
1486
1487 r = bus_ensure_running(bus);
1488 if (r < 0)
1489 return r;
1490
1491 return bus->can_fds;
1492 }
1493
1494 return bus_type_is_valid(type);
1495 }
1496
1497 _public_ int sd_bus_get_bus_id(sd_bus *bus, sd_id128_t *id) {
1498 int r;
1499
1500 assert_return(bus, -EINVAL);
1501 assert_return(id, -EINVAL);
1502 assert_return(!bus_pid_changed(bus), -ECHILD);
1503
1504 r = bus_ensure_running(bus);
1505 if (r < 0)
1506 return r;
1507
1508 *id = bus->server_id;
1509 return 0;
1510 }
1511
1512 static int bus_seal_message(sd_bus *b, sd_bus_message *m, usec_t timeout) {
1513 assert(b);
1514 assert(m);
1515
1516 if (m->sealed) {
1517 /* If we copy the same message to multiple
1518 * destinations, avoid using the same cookie
1519 * numbers. */
1520 b->cookie = MAX(b->cookie, BUS_MESSAGE_COOKIE(m));
1521 return 0;
1522 }
1523
1524 if (timeout == 0)
1525 timeout = BUS_DEFAULT_TIMEOUT;
1526
1527 return bus_message_seal(m, ++b->cookie, timeout);
1528 }
1529
1530 static int bus_remarshal_message(sd_bus *b, sd_bus_message **m) {
1531 bool remarshal = false;
1532
1533 assert(b);
1534
1535 /* wrong packet version */
1536 if (b->message_version != 0 && b->message_version != (*m)->header->version)
1537 remarshal = true;
1538
1539 /* wrong packet endianness */
1540 if (b->message_endian != 0 && b->message_endian != (*m)->header->endian)
1541 remarshal = true;
1542
1543 /* TODO: kdbus-messages received from the kernel contain data which is
1544 * not allowed to be passed to KDBUS_CMD_SEND. Therefore, we have to
1545 * force remarshaling of the message. Technically, we could just
1546 * recreate the kdbus message, but that is non-trivial as other parts of
1547 * the message refer to m->kdbus already. This should be fixed! */
1548 if ((*m)->kdbus && (*m)->release_kdbus)
1549 remarshal = true;
1550
1551 return remarshal ? bus_message_remarshal(b, m) : 0;
1552 }
1553
1554 int bus_seal_synthetic_message(sd_bus *b, sd_bus_message *m) {
1555 assert(b);
1556 assert(m);
1557
1558 /* Fake some timestamps, if they were requested, and not
1559 * already initialized */
1560 if (b->attach_flags & KDBUS_ATTACH_TIMESTAMP) {
1561 if (m->realtime <= 0)
1562 m->realtime = now(CLOCK_REALTIME);
1563
1564 if (m->monotonic <= 0)
1565 m->monotonic = now(CLOCK_MONOTONIC);
1566 }
1567
1568 /* The bus specification says the serial number cannot be 0,
1569 * hence let's fill something in for synthetic messages. Since
1570 * synthetic messages might have a fake sender and we don't
1571 * want to interfere with the real sender's serial numbers we
1572 * pick a fixed, artificial one. We use (uint32_t) -1 rather
1573 * than (uint64_t) -1 since dbus1 only had 32bit identifiers,
1574 * even though kdbus can do 64bit. */
1575 return bus_message_seal(m, 0xFFFFFFFFULL, 0);
1576 }
1577
1578 static int bus_write_message(sd_bus *bus, sd_bus_message *m, bool hint_sync_call, size_t *idx) {
1579 int r;
1580
1581 assert(bus);
1582 assert(m);
1583
1584 if (bus->is_kernel)
1585 r = bus_kernel_write_message(bus, m, hint_sync_call);
1586 else
1587 r = bus_socket_write_message(bus, m, idx);
1588
1589 if (r <= 0)
1590 return r;
1591
1592 if (bus->is_kernel || *idx >= BUS_MESSAGE_SIZE(m))
1593 log_debug("Sent message type=%s sender=%s destination=%s object=%s interface=%s member=%s cookie=%" PRIu64 " reply_cookie=%" PRIu64 " error=%s",
1594 bus_message_type_to_string(m->header->type),
1595 strna(sd_bus_message_get_sender(m)),
1596 strna(sd_bus_message_get_destination(m)),
1597 strna(sd_bus_message_get_path(m)),
1598 strna(sd_bus_message_get_interface(m)),
1599 strna(sd_bus_message_get_member(m)),
1600 BUS_MESSAGE_COOKIE(m),
1601 m->reply_cookie,
1602 strna(m->error.message));
1603
1604 return r;
1605 }
1606
1607 static int dispatch_wqueue(sd_bus *bus) {
1608 int r, ret = 0;
1609
1610 assert(bus);
1611 assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO);
1612
1613 while (bus->wqueue_size > 0) {
1614
1615 r = bus_write_message(bus, bus->wqueue[0], false, &bus->windex);
1616 if (r < 0)
1617 return r;
1618 else if (r == 0)
1619 /* Didn't do anything this time */
1620 return ret;
1621 else if (bus->is_kernel || bus->windex >= BUS_MESSAGE_SIZE(bus->wqueue[0])) {
1622 /* Fully written. Let's drop the entry from
1623 * the queue.
1624 *
1625 * This isn't particularly optimized, but
1626 * well, this is supposed to be our worst-case
1627 * buffer only, and the socket buffer is
1628 * supposed to be our primary buffer, and if
1629 * it got full, then all bets are off
1630 * anyway. */
1631
1632 bus->wqueue_size --;
1633 sd_bus_message_unref(bus->wqueue[0]);
1634 memmove(bus->wqueue, bus->wqueue + 1, sizeof(sd_bus_message*) * bus->wqueue_size);
1635 bus->windex = 0;
1636
1637 ret = 1;
1638 }
1639 }
1640
1641 return ret;
1642 }
1643
1644 static int bus_read_message(sd_bus *bus, bool hint_priority, int64_t priority) {
1645 assert(bus);
1646
1647 if (bus->is_kernel)
1648 return bus_kernel_read_message(bus, hint_priority, priority);
1649 else
1650 return bus_socket_read_message(bus);
1651 }
1652
1653 int bus_rqueue_make_room(sd_bus *bus) {
1654 assert(bus);
1655
1656 if (bus->rqueue_size >= BUS_RQUEUE_MAX)
1657 return -ENOBUFS;
1658
1659 if (!GREEDY_REALLOC(bus->rqueue, bus->rqueue_allocated, bus->rqueue_size + 1))
1660 return -ENOMEM;
1661
1662 return 0;
1663 }
1664
1665 static int dispatch_rqueue(sd_bus *bus, bool hint_priority, int64_t priority, sd_bus_message **m) {
1666 int r, ret = 0;
1667
1668 assert(bus);
1669 assert(m);
1670 assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO);
1671
1672 /* Note that the priority logic is only available on kdbus,
1673 * where the rqueue is unused. We check the rqueue here
1674 * anyway, because it's simple... */
1675
1676 for (;;) {
1677 if (bus->rqueue_size > 0) {
1678 /* Dispatch a queued message */
1679
1680 *m = bus->rqueue[0];
1681 bus->rqueue_size --;
1682 memmove(bus->rqueue, bus->rqueue + 1, sizeof(sd_bus_message*) * bus->rqueue_size);
1683 return 1;
1684 }
1685
1686 /* Try to read a new message */
1687 r = bus_read_message(bus, hint_priority, priority);
1688 if (r < 0)
1689 return r;
1690 if (r == 0)
1691 return ret;
1692
1693 ret = 1;
1694 }
1695 }
1696
1697 static int bus_send_internal(sd_bus *bus, sd_bus_message *_m, uint64_t *cookie, bool hint_sync_call) {
1698 _cleanup_bus_message_unref_ sd_bus_message *m = sd_bus_message_ref(_m);
1699 int r;
1700
1701 assert_return(m, -EINVAL);
1702
1703 if (!bus)
1704 bus = m->bus;
1705
1706 assert_return(!bus_pid_changed(bus), -ECHILD);
1707 assert_return(!bus->is_kernel || !(bus->hello_flags & KDBUS_HELLO_MONITOR), -EROFS);
1708
1709 if (!BUS_IS_OPEN(bus->state))
1710 return -ENOTCONN;
1711
1712 if (m->n_fds > 0) {
1713 r = sd_bus_can_send(bus, SD_BUS_TYPE_UNIX_FD);
1714 if (r < 0)
1715 return r;
1716 if (r == 0)
1717 return -EOPNOTSUPP;
1718 }
1719
1720 /* If the cookie number isn't kept, then we know that no reply
1721 * is expected */
1722 if (!cookie && !m->sealed)
1723 m->header->flags |= BUS_MESSAGE_NO_REPLY_EXPECTED;
1724
1725 r = bus_seal_message(bus, m, 0);
1726 if (r < 0)
1727 return r;
1728
1729 /* Remarshall if we have to. This will possibly unref the
1730 * message and place a replacement in m */
1731 r = bus_remarshal_message(bus, &m);
1732 if (r < 0)
1733 return r;
1734
1735 /* If this is a reply and no reply was requested, then let's
1736 * suppress this, if we can */
1737 if (m->dont_send)
1738 goto finish;
1739
1740 if ((bus->state == BUS_RUNNING || bus->state == BUS_HELLO) && bus->wqueue_size <= 0) {
1741 size_t idx = 0;
1742
1743 r = bus_write_message(bus, m, hint_sync_call, &idx);
1744 if (r < 0) {
1745 if (r == -ENOTCONN || r == -ECONNRESET || r == -EPIPE || r == -ESHUTDOWN) {
1746 bus_enter_closing(bus);
1747 return -ECONNRESET;
1748 }
1749
1750 return r;
1751 }
1752
1753 if (!bus->is_kernel && idx < BUS_MESSAGE_SIZE(m)) {
1754 /* Wasn't fully written. So let's remember how
1755 * much was written. Note that the first entry
1756 * of the wqueue array is always allocated so
1757 * that we always can remember how much was
1758 * written. */
1759 bus->wqueue[0] = sd_bus_message_ref(m);
1760 bus->wqueue_size = 1;
1761 bus->windex = idx;
1762 }
1763
1764 } else {
1765 /* Just append it to the queue. */
1766
1767 if (bus->wqueue_size >= BUS_WQUEUE_MAX)
1768 return -ENOBUFS;
1769
1770 if (!GREEDY_REALLOC(bus->wqueue, bus->wqueue_allocated, bus->wqueue_size + 1))
1771 return -ENOMEM;
1772
1773 bus->wqueue[bus->wqueue_size ++] = sd_bus_message_ref(m);
1774 }
1775
1776 finish:
1777 if (cookie)
1778 *cookie = BUS_MESSAGE_COOKIE(m);
1779
1780 return 1;
1781 }
1782
1783 _public_ int sd_bus_send(sd_bus *bus, sd_bus_message *m, uint64_t *cookie) {
1784 return bus_send_internal(bus, m, cookie, false);
1785 }
1786
1787 _public_ int sd_bus_send_to(sd_bus *bus, sd_bus_message *m, const char *destination, uint64_t *cookie) {
1788 int r;
1789
1790 assert_return(m, -EINVAL);
1791
1792 if (!bus)
1793 bus = m->bus;
1794
1795 assert_return(!bus_pid_changed(bus), -ECHILD);
1796
1797 if (!BUS_IS_OPEN(bus->state))
1798 return -ENOTCONN;
1799
1800 if (!streq_ptr(m->destination, destination)) {
1801
1802 if (!destination)
1803 return -EEXIST;
1804
1805 r = sd_bus_message_set_destination(m, destination);
1806 if (r < 0)
1807 return r;
1808 }
1809
1810 return sd_bus_send(bus, m, cookie);
1811 }
1812
1813 static usec_t calc_elapse(uint64_t usec) {
1814 if (usec == (uint64_t) -1)
1815 return 0;
1816
1817 return now(CLOCK_MONOTONIC) + usec;
1818 }
1819
1820 static int timeout_compare(const void *a, const void *b) {
1821 const struct reply_callback *x = a, *y = b;
1822
1823 if (x->timeout != 0 && y->timeout == 0)
1824 return -1;
1825
1826 if (x->timeout == 0 && y->timeout != 0)
1827 return 1;
1828
1829 if (x->timeout < y->timeout)
1830 return -1;
1831
1832 if (x->timeout > y->timeout)
1833 return 1;
1834
1835 return 0;
1836 }
1837
1838 _public_ int sd_bus_call_async(
1839 sd_bus *bus,
1840 sd_bus_slot **slot,
1841 sd_bus_message *_m,
1842 sd_bus_message_handler_t callback,
1843 void *userdata,
1844 uint64_t usec) {
1845
1846 _cleanup_bus_message_unref_ sd_bus_message *m = sd_bus_message_ref(_m);
1847 _cleanup_bus_slot_unref_ sd_bus_slot *s = NULL;
1848 int r;
1849
1850 assert_return(m, -EINVAL);
1851 assert_return(m->header->type == SD_BUS_MESSAGE_METHOD_CALL, -EINVAL);
1852 assert_return(!(m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED), -EINVAL);
1853 assert_return(callback, -EINVAL);
1854
1855 if (!bus)
1856 bus = m->bus;
1857
1858 assert_return(!bus_pid_changed(bus), -ECHILD);
1859 assert_return(!bus->is_kernel || !(bus->hello_flags & KDBUS_HELLO_MONITOR), -EROFS);
1860
1861 if (!BUS_IS_OPEN(bus->state))
1862 return -ENOTCONN;
1863
1864 r = ordered_hashmap_ensure_allocated(&bus->reply_callbacks, &uint64_hash_ops);
1865 if (r < 0)
1866 return r;
1867
1868 r = prioq_ensure_allocated(&bus->reply_callbacks_prioq, timeout_compare);
1869 if (r < 0)
1870 return r;
1871
1872 r = bus_seal_message(bus, m, usec);
1873 if (r < 0)
1874 return r;
1875
1876 r = bus_remarshal_message(bus, &m);
1877 if (r < 0)
1878 return r;
1879
1880 s = bus_slot_allocate(bus, !slot, BUS_REPLY_CALLBACK, sizeof(struct reply_callback), userdata);
1881 if (!s)
1882 return -ENOMEM;
1883
1884 s->reply_callback.callback = callback;
1885
1886 s->reply_callback.cookie = BUS_MESSAGE_COOKIE(m);
1887 r = ordered_hashmap_put(bus->reply_callbacks, &s->reply_callback.cookie, &s->reply_callback);
1888 if (r < 0) {
1889 s->reply_callback.cookie = 0;
1890 return r;
1891 }
1892
1893 s->reply_callback.timeout = calc_elapse(m->timeout);
1894 if (s->reply_callback.timeout != 0) {
1895 r = prioq_put(bus->reply_callbacks_prioq, &s->reply_callback, &s->reply_callback.prioq_idx);
1896 if (r < 0) {
1897 s->reply_callback.timeout = 0;
1898 return r;
1899 }
1900 }
1901
1902 r = sd_bus_send(bus, m, &s->reply_callback.cookie);
1903 if (r < 0)
1904 return r;
1905
1906 if (slot)
1907 *slot = s;
1908 s = NULL;
1909
1910 return r;
1911 }
1912
1913 int bus_ensure_running(sd_bus *bus) {
1914 int r;
1915
1916 assert(bus);
1917
1918 if (bus->state == BUS_UNSET || bus->state == BUS_CLOSED || bus->state == BUS_CLOSING)
1919 return -ENOTCONN;
1920 if (bus->state == BUS_RUNNING)
1921 return 1;
1922
1923 for (;;) {
1924 r = sd_bus_process(bus, NULL);
1925 if (r < 0)
1926 return r;
1927 if (bus->state == BUS_RUNNING)
1928 return 1;
1929 if (r > 0)
1930 continue;
1931
1932 r = sd_bus_wait(bus, (uint64_t) -1);
1933 if (r < 0)
1934 return r;
1935 }
1936 }
1937
1938 _public_ int sd_bus_call(
1939 sd_bus *bus,
1940 sd_bus_message *_m,
1941 uint64_t usec,
1942 sd_bus_error *error,
1943 sd_bus_message **reply) {
1944
1945 _cleanup_bus_message_unref_ sd_bus_message *m = sd_bus_message_ref(_m);
1946 usec_t timeout;
1947 uint64_t cookie;
1948 unsigned i;
1949 int r;
1950
1951 assert_return(m, -EINVAL);
1952 assert_return(m->header->type == SD_BUS_MESSAGE_METHOD_CALL, -EINVAL);
1953 assert_return(!(m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED), -EINVAL);
1954 assert_return(!bus_error_is_dirty(error), -EINVAL);
1955
1956 if (!bus)
1957 bus = m->bus;
1958
1959 assert_return(!bus_pid_changed(bus), -ECHILD);
1960 assert_return(!bus->is_kernel || !(bus->hello_flags & KDBUS_HELLO_MONITOR), -EROFS);
1961
1962 if (!BUS_IS_OPEN(bus->state))
1963 return -ENOTCONN;
1964
1965 r = bus_ensure_running(bus);
1966 if (r < 0)
1967 return r;
1968
1969 i = bus->rqueue_size;
1970
1971 r = bus_seal_message(bus, m, usec);
1972 if (r < 0)
1973 return r;
1974
1975 r = bus_remarshal_message(bus, &m);
1976 if (r < 0)
1977 return r;
1978
1979 r = bus_send_internal(bus, m, &cookie, true);
1980 if (r < 0)
1981 return r;
1982
1983 timeout = calc_elapse(m->timeout);
1984
1985 for (;;) {
1986 usec_t left;
1987
1988 while (i < bus->rqueue_size) {
1989 sd_bus_message *incoming = NULL;
1990
1991 incoming = bus->rqueue[i];
1992
1993 if (incoming->reply_cookie == cookie) {
1994 /* Found a match! */
1995
1996 memmove(bus->rqueue + i, bus->rqueue + i + 1, sizeof(sd_bus_message*) * (bus->rqueue_size - i - 1));
1997 bus->rqueue_size--;
1998 log_debug_bus_message(incoming);
1999
2000 if (incoming->header->type == SD_BUS_MESSAGE_METHOD_RETURN) {
2001
2002 if (incoming->n_fds <= 0 || (bus->hello_flags & KDBUS_HELLO_ACCEPT_FD)) {
2003 if (reply)
2004 *reply = incoming;
2005 else
2006 sd_bus_message_unref(incoming);
2007
2008 return 1;
2009 }
2010
2011 r = sd_bus_error_setf(error, SD_BUS_ERROR_INCONSISTENT_MESSAGE, "Reply message contained file descriptors which I couldn't accept. Sorry.");
2012
2013 } else if (incoming->header->type == SD_BUS_MESSAGE_METHOD_ERROR)
2014 r = sd_bus_error_copy(error, &incoming->error);
2015 else
2016 r = -EIO;
2017
2018 sd_bus_message_unref(incoming);
2019 return r;
2020
2021 } else if (BUS_MESSAGE_COOKIE(incoming) == cookie &&
2022 bus->unique_name &&
2023 incoming->sender &&
2024 streq(bus->unique_name, incoming->sender)) {
2025
2026 memmove(bus->rqueue + i, bus->rqueue + i + 1, sizeof(sd_bus_message*) * (bus->rqueue_size - i - 1));
2027 bus->rqueue_size--;
2028
2029 /* Our own message? Somebody is trying
2030 * to send its own client a message,
2031 * let's not dead-lock, let's fail
2032 * immediately. */
2033
2034 sd_bus_message_unref(incoming);
2035 return -ELOOP;
2036 }
2037
2038 /* Try to read more, right-away */
2039 i++;
2040 }
2041
2042 r = bus_read_message(bus, false, 0);
2043 if (r < 0) {
2044 if (r == -ENOTCONN || r == -ECONNRESET || r == -EPIPE || r == -ESHUTDOWN) {
2045 bus_enter_closing(bus);
2046 return -ECONNRESET;
2047 }
2048
2049 return r;
2050 }
2051 if (r > 0)
2052 continue;
2053
2054 if (timeout > 0) {
2055 usec_t n;
2056
2057 n = now(CLOCK_MONOTONIC);
2058 if (n >= timeout)
2059 return -ETIMEDOUT;
2060
2061 left = timeout - n;
2062 } else
2063 left = (uint64_t) -1;
2064
2065 r = bus_poll(bus, true, left);
2066 if (r < 0)
2067 return r;
2068 if (r == 0)
2069 return -ETIMEDOUT;
2070
2071 r = dispatch_wqueue(bus);
2072 if (r < 0) {
2073 if (r == -ENOTCONN || r == -ECONNRESET || r == -EPIPE || r == -ESHUTDOWN) {
2074 bus_enter_closing(bus);
2075 return -ECONNRESET;
2076 }
2077
2078 return r;
2079 }
2080 }
2081 }
2082
2083 _public_ int sd_bus_get_fd(sd_bus *bus) {
2084
2085 assert_return(bus, -EINVAL);
2086 assert_return(bus->input_fd == bus->output_fd, -EPERM);
2087 assert_return(!bus_pid_changed(bus), -ECHILD);
2088
2089 return bus->input_fd;
2090 }
2091
2092 _public_ int sd_bus_get_events(sd_bus *bus) {
2093 int flags = 0;
2094
2095 assert_return(bus, -EINVAL);
2096 assert_return(!bus_pid_changed(bus), -ECHILD);
2097
2098 if (!BUS_IS_OPEN(bus->state) && bus->state != BUS_CLOSING)
2099 return -ENOTCONN;
2100
2101 if (bus->state == BUS_OPENING)
2102 flags |= POLLOUT;
2103 else if (bus->state == BUS_AUTHENTICATING) {
2104
2105 if (bus_socket_auth_needs_write(bus))
2106 flags |= POLLOUT;
2107
2108 flags |= POLLIN;
2109
2110 } else if (bus->state == BUS_RUNNING || bus->state == BUS_HELLO) {
2111 if (bus->rqueue_size <= 0)
2112 flags |= POLLIN;
2113 if (bus->wqueue_size > 0)
2114 flags |= POLLOUT;
2115 }
2116
2117 return flags;
2118 }
2119
2120 _public_ int sd_bus_get_timeout(sd_bus *bus, uint64_t *timeout_usec) {
2121 struct reply_callback *c;
2122
2123 assert_return(bus, -EINVAL);
2124 assert_return(timeout_usec, -EINVAL);
2125 assert_return(!bus_pid_changed(bus), -ECHILD);
2126
2127 if (!BUS_IS_OPEN(bus->state) && bus->state != BUS_CLOSING)
2128 return -ENOTCONN;
2129
2130 if (bus->track_queue) {
2131 *timeout_usec = 0;
2132 return 1;
2133 }
2134
2135 if (bus->state == BUS_CLOSING) {
2136 *timeout_usec = 0;
2137 return 1;
2138 }
2139
2140 if (bus->state == BUS_AUTHENTICATING) {
2141 *timeout_usec = bus->auth_timeout;
2142 return 1;
2143 }
2144
2145 if (bus->state != BUS_RUNNING && bus->state != BUS_HELLO) {
2146 *timeout_usec = (uint64_t) -1;
2147 return 0;
2148 }
2149
2150 if (bus->rqueue_size > 0) {
2151 *timeout_usec = 0;
2152 return 1;
2153 }
2154
2155 c = prioq_peek(bus->reply_callbacks_prioq);
2156 if (!c) {
2157 *timeout_usec = (uint64_t) -1;
2158 return 0;
2159 }
2160
2161 if (c->timeout == 0) {
2162 *timeout_usec = (uint64_t) -1;
2163 return 0;
2164 }
2165
2166 *timeout_usec = c->timeout;
2167 return 1;
2168 }
2169
2170 static int process_timeout(sd_bus *bus) {
2171 _cleanup_bus_error_free_ sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
2172 _cleanup_bus_message_unref_ sd_bus_message* m = NULL;
2173 struct reply_callback *c;
2174 sd_bus_slot *slot;
2175 usec_t n;
2176 int r;
2177
2178 assert(bus);
2179
2180 c = prioq_peek(bus->reply_callbacks_prioq);
2181 if (!c)
2182 return 0;
2183
2184 n = now(CLOCK_MONOTONIC);
2185 if (c->timeout > n)
2186 return 0;
2187
2188 r = bus_message_new_synthetic_error(
2189 bus,
2190 c->cookie,
2191 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Method call timed out"),
2192 &m);
2193 if (r < 0)
2194 return r;
2195
2196 r = bus_seal_synthetic_message(bus, m);
2197 if (r < 0)
2198 return r;
2199
2200 assert_se(prioq_pop(bus->reply_callbacks_prioq) == c);
2201 c->timeout = 0;
2202
2203 ordered_hashmap_remove(bus->reply_callbacks, &c->cookie);
2204 c->cookie = 0;
2205
2206 slot = container_of(c, sd_bus_slot, reply_callback);
2207
2208 bus->iteration_counter ++;
2209
2210 bus->current_message = m;
2211 bus->current_slot = sd_bus_slot_ref(slot);
2212 bus->current_handler = c->callback;
2213 bus->current_userdata = slot->userdata;
2214 r = c->callback(m, slot->userdata, &error_buffer);
2215 bus->current_userdata = NULL;
2216 bus->current_handler = NULL;
2217 bus->current_slot = NULL;
2218 bus->current_message = NULL;
2219
2220 if (slot->floating) {
2221 bus_slot_disconnect(slot);
2222 sd_bus_slot_unref(slot);
2223 }
2224
2225 sd_bus_slot_unref(slot);
2226
2227 return bus_maybe_reply_error(m, r, &error_buffer);
2228 }
2229
2230 static int process_hello(sd_bus *bus, sd_bus_message *m) {
2231 assert(bus);
2232 assert(m);
2233
2234 if (bus->state != BUS_HELLO)
2235 return 0;
2236
2237 /* Let's make sure the first message on the bus is the HELLO
2238 * reply. But note that we don't actually parse the message
2239 * here (we leave that to the usual handling), we just verify
2240 * we don't let any earlier msg through. */
2241
2242 if (m->header->type != SD_BUS_MESSAGE_METHOD_RETURN &&
2243 m->header->type != SD_BUS_MESSAGE_METHOD_ERROR)
2244 return -EIO;
2245
2246 if (m->reply_cookie != 1)
2247 return -EIO;
2248
2249 return 0;
2250 }
2251
2252 static int process_reply(sd_bus *bus, sd_bus_message *m) {
2253 _cleanup_bus_message_unref_ sd_bus_message *synthetic_reply = NULL;
2254 _cleanup_bus_error_free_ sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
2255 struct reply_callback *c;
2256 sd_bus_slot *slot;
2257 int r;
2258
2259 assert(bus);
2260 assert(m);
2261
2262 if (m->header->type != SD_BUS_MESSAGE_METHOD_RETURN &&
2263 m->header->type != SD_BUS_MESSAGE_METHOD_ERROR)
2264 return 0;
2265
2266 if (bus->is_kernel && (bus->hello_flags & KDBUS_HELLO_MONITOR))
2267 return 0;
2268
2269 if (m->destination && bus->unique_name && !streq_ptr(m->destination, bus->unique_name))
2270 return 0;
2271
2272 c = ordered_hashmap_remove(bus->reply_callbacks, &m->reply_cookie);
2273 if (!c)
2274 return 0;
2275
2276 c->cookie = 0;
2277
2278 slot = container_of(c, sd_bus_slot, reply_callback);
2279
2280 if (m->n_fds > 0 && !(bus->hello_flags & KDBUS_HELLO_ACCEPT_FD)) {
2281
2282 /* If the reply contained a file descriptor which we
2283 * didn't want we pass an error instead. */
2284
2285 r = bus_message_new_synthetic_error(
2286 bus,
2287 m->reply_cookie,
2288 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INCONSISTENT_MESSAGE, "Reply message contained file descriptor"),
2289 &synthetic_reply);
2290 if (r < 0)
2291 return r;
2292
2293 /* Copy over original timestamp */
2294 synthetic_reply->realtime = m->realtime;
2295 synthetic_reply->monotonic = m->monotonic;
2296 synthetic_reply->seqnum = m->seqnum;
2297
2298 r = bus_seal_synthetic_message(bus, synthetic_reply);
2299 if (r < 0)
2300 return r;
2301
2302 m = synthetic_reply;
2303 } else {
2304 r = sd_bus_message_rewind(m, true);
2305 if (r < 0)
2306 return r;
2307 }
2308
2309 if (c->timeout != 0) {
2310 prioq_remove(bus->reply_callbacks_prioq, c, &c->prioq_idx);
2311 c->timeout = 0;
2312 }
2313
2314 bus->current_slot = sd_bus_slot_ref(slot);
2315 bus->current_handler = c->callback;
2316 bus->current_userdata = slot->userdata;
2317 r = c->callback(m, slot->userdata, &error_buffer);
2318 bus->current_userdata = NULL;
2319 bus->current_handler = NULL;
2320 bus->current_slot = NULL;
2321
2322 if (slot->floating) {
2323 bus_slot_disconnect(slot);
2324 sd_bus_slot_unref(slot);
2325 }
2326
2327 sd_bus_slot_unref(slot);
2328
2329 return bus_maybe_reply_error(m, r, &error_buffer);
2330 }
2331
2332 static int process_filter(sd_bus *bus, sd_bus_message *m) {
2333 _cleanup_bus_error_free_ sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
2334 struct filter_callback *l;
2335 int r;
2336
2337 assert(bus);
2338 assert(m);
2339
2340 do {
2341 bus->filter_callbacks_modified = false;
2342
2343 LIST_FOREACH(callbacks, l, bus->filter_callbacks) {
2344 sd_bus_slot *slot;
2345
2346 if (bus->filter_callbacks_modified)
2347 break;
2348
2349 /* Don't run this more than once per iteration */
2350 if (l->last_iteration == bus->iteration_counter)
2351 continue;
2352
2353 l->last_iteration = bus->iteration_counter;
2354
2355 r = sd_bus_message_rewind(m, true);
2356 if (r < 0)
2357 return r;
2358
2359 slot = container_of(l, sd_bus_slot, filter_callback);
2360
2361 bus->current_slot = sd_bus_slot_ref(slot);
2362 bus->current_handler = l->callback;
2363 bus->current_userdata = slot->userdata;
2364 r = l->callback(m, slot->userdata, &error_buffer);
2365 bus->current_userdata = NULL;
2366 bus->current_handler = NULL;
2367 bus->current_slot = sd_bus_slot_unref(slot);
2368
2369 r = bus_maybe_reply_error(m, r, &error_buffer);
2370 if (r != 0)
2371 return r;
2372
2373 }
2374
2375 } while (bus->filter_callbacks_modified);
2376
2377 return 0;
2378 }
2379
2380 static int process_match(sd_bus *bus, sd_bus_message *m) {
2381 int r;
2382
2383 assert(bus);
2384 assert(m);
2385
2386 do {
2387 bus->match_callbacks_modified = false;
2388
2389 r = bus_match_run(bus, &bus->match_callbacks, m);
2390 if (r != 0)
2391 return r;
2392
2393 } while (bus->match_callbacks_modified);
2394
2395 return 0;
2396 }
2397
2398 static int process_builtin(sd_bus *bus, sd_bus_message *m) {
2399 _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
2400 int r;
2401
2402 assert(bus);
2403 assert(m);
2404
2405 if (bus->hello_flags & KDBUS_HELLO_MONITOR)
2406 return 0;
2407
2408 if (bus->manual_peer_interface)
2409 return 0;
2410
2411 if (m->header->type != SD_BUS_MESSAGE_METHOD_CALL)
2412 return 0;
2413
2414 if (!streq_ptr(m->interface, "org.freedesktop.DBus.Peer"))
2415 return 0;
2416
2417 if (m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED)
2418 return 1;
2419
2420 if (streq_ptr(m->member, "Ping"))
2421 r = sd_bus_message_new_method_return(m, &reply);
2422 else if (streq_ptr(m->member, "GetMachineId")) {
2423 sd_id128_t id;
2424 char sid[33];
2425
2426 r = sd_id128_get_machine(&id);
2427 if (r < 0)
2428 return r;
2429
2430 r = sd_bus_message_new_method_return(m, &reply);
2431 if (r < 0)
2432 return r;
2433
2434 r = sd_bus_message_append(reply, "s", sd_id128_to_string(id, sid));
2435 } else {
2436 r = sd_bus_message_new_method_errorf(
2437 m, &reply,
2438 SD_BUS_ERROR_UNKNOWN_METHOD,
2439 "Unknown method '%s' on interface '%s'.", m->member, m->interface);
2440 }
2441
2442 if (r < 0)
2443 return r;
2444
2445 r = sd_bus_send(bus, reply, NULL);
2446 if (r < 0)
2447 return r;
2448
2449 return 1;
2450 }
2451
2452 static int process_fd_check(sd_bus *bus, sd_bus_message *m) {
2453 assert(bus);
2454 assert(m);
2455
2456 /* If we got a message with a file descriptor which we didn't
2457 * want to accept, then let's drop it. How can this even
2458 * happen? For example, when the kernel queues a message into
2459 * an activatable names's queue which allows fds, and then is
2460 * delivered to us later even though we ourselves did not
2461 * negotiate it. */
2462
2463 if (bus->hello_flags & KDBUS_HELLO_MONITOR)
2464 return 0;
2465
2466 if (m->n_fds <= 0)
2467 return 0;
2468
2469 if (bus->hello_flags & KDBUS_HELLO_ACCEPT_FD)
2470 return 0;
2471
2472 if (m->header->type != SD_BUS_MESSAGE_METHOD_CALL)
2473 return 1; /* just eat it up */
2474
2475 return sd_bus_reply_method_errorf(m, SD_BUS_ERROR_INCONSISTENT_MESSAGE, "Message contains file descriptors, which I cannot accept. Sorry.");
2476 }
2477
2478 static int process_message(sd_bus *bus, sd_bus_message *m) {
2479 int r;
2480
2481 assert(bus);
2482 assert(m);
2483
2484 bus->current_message = m;
2485 bus->iteration_counter++;
2486
2487 log_debug_bus_message(m);
2488
2489 r = process_hello(bus, m);
2490 if (r != 0)
2491 goto finish;
2492
2493 r = process_reply(bus, m);
2494 if (r != 0)
2495 goto finish;
2496
2497 r = process_fd_check(bus, m);
2498 if (r != 0)
2499 goto finish;
2500
2501 r = process_filter(bus, m);
2502 if (r != 0)
2503 goto finish;
2504
2505 r = process_match(bus, m);
2506 if (r != 0)
2507 goto finish;
2508
2509 r = process_builtin(bus, m);
2510 if (r != 0)
2511 goto finish;
2512
2513 r = bus_process_object(bus, m);
2514
2515 finish:
2516 bus->current_message = NULL;
2517 return r;
2518 }
2519
2520 static int dispatch_track(sd_bus *bus) {
2521 assert(bus);
2522
2523 if (!bus->track_queue)
2524 return 0;
2525
2526 bus_track_dispatch(bus->track_queue);
2527 return 1;
2528 }
2529
2530 static int process_running(sd_bus *bus, bool hint_priority, int64_t priority, sd_bus_message **ret) {
2531 _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
2532 int r;
2533
2534 assert(bus);
2535 assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO);
2536
2537 r = process_timeout(bus);
2538 if (r != 0)
2539 goto null_message;
2540
2541 r = dispatch_wqueue(bus);
2542 if (r != 0)
2543 goto null_message;
2544
2545 r = dispatch_track(bus);
2546 if (r != 0)
2547 goto null_message;
2548
2549 r = dispatch_rqueue(bus, hint_priority, priority, &m);
2550 if (r < 0)
2551 return r;
2552 if (!m)
2553 goto null_message;
2554
2555 r = process_message(bus, m);
2556 if (r != 0)
2557 goto null_message;
2558
2559 if (ret) {
2560 r = sd_bus_message_rewind(m, true);
2561 if (r < 0)
2562 return r;
2563
2564 *ret = m;
2565 m = NULL;
2566 return 1;
2567 }
2568
2569 if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL) {
2570
2571 log_debug("Unprocessed message call sender=%s object=%s interface=%s member=%s",
2572 strna(sd_bus_message_get_sender(m)),
2573 strna(sd_bus_message_get_path(m)),
2574 strna(sd_bus_message_get_interface(m)),
2575 strna(sd_bus_message_get_member(m)));
2576
2577 r = sd_bus_reply_method_errorf(
2578 m,
2579 SD_BUS_ERROR_UNKNOWN_OBJECT,
2580 "Unknown object '%s'.", m->path);
2581 if (r < 0)
2582 return r;
2583 }
2584
2585 return 1;
2586
2587 null_message:
2588 if (r >= 0 && ret)
2589 *ret = NULL;
2590
2591 return r;
2592 }
2593
2594 static int process_closing(sd_bus *bus, sd_bus_message **ret) {
2595 _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
2596 struct reply_callback *c;
2597 int r;
2598
2599 assert(bus);
2600 assert(bus->state == BUS_CLOSING);
2601
2602 c = ordered_hashmap_first(bus->reply_callbacks);
2603 if (c) {
2604 _cleanup_bus_error_free_ sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
2605 sd_bus_slot *slot;
2606
2607 /* First, fail all outstanding method calls */
2608 r = bus_message_new_synthetic_error(
2609 bus,
2610 c->cookie,
2611 &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Connection terminated"),
2612 &m);
2613 if (r < 0)
2614 return r;
2615
2616 r = bus_seal_synthetic_message(bus, m);
2617 if (r < 0)
2618 return r;
2619
2620 if (c->timeout != 0) {
2621 prioq_remove(bus->reply_callbacks_prioq, c, &c->prioq_idx);
2622 c->timeout = 0;
2623 }
2624
2625 ordered_hashmap_remove(bus->reply_callbacks, &c->cookie);
2626 c->cookie = 0;
2627
2628 slot = container_of(c, sd_bus_slot, reply_callback);
2629
2630 bus->iteration_counter++;
2631
2632 bus->current_message = m;
2633 bus->current_slot = sd_bus_slot_ref(slot);
2634 bus->current_handler = c->callback;
2635 bus->current_userdata = slot->userdata;
2636 r = c->callback(m, slot->userdata, &error_buffer);
2637 bus->current_userdata = NULL;
2638 bus->current_handler = NULL;
2639 bus->current_slot = NULL;
2640 bus->current_message = NULL;
2641
2642 if (slot->floating) {
2643 bus_slot_disconnect(slot);
2644 sd_bus_slot_unref(slot);
2645 }
2646
2647 sd_bus_slot_unref(slot);
2648
2649 return bus_maybe_reply_error(m, r, &error_buffer);
2650 }
2651
2652 /* Then, synthesize a Disconnected message */
2653 r = sd_bus_message_new_signal(
2654 bus,
2655 &m,
2656 "/org/freedesktop/DBus/Local",
2657 "org.freedesktop.DBus.Local",
2658 "Disconnected");
2659 if (r < 0)
2660 return r;
2661
2662 bus_message_set_sender_local(bus, m);
2663
2664 r = bus_seal_synthetic_message(bus, m);
2665 if (r < 0)
2666 return r;
2667
2668 sd_bus_close(bus);
2669
2670 bus->current_message = m;
2671 bus->iteration_counter++;
2672
2673 r = process_filter(bus, m);
2674 if (r != 0)
2675 goto finish;
2676
2677 r = process_match(bus, m);
2678 if (r != 0)
2679 goto finish;
2680
2681 if (ret) {
2682 *ret = m;
2683 m = NULL;
2684 }
2685
2686 r = 1;
2687
2688 finish:
2689 bus->current_message = NULL;
2690
2691 return r;
2692 }
2693
2694 static int bus_process_internal(sd_bus *bus, bool hint_priority, int64_t priority, sd_bus_message **ret) {
2695 BUS_DONT_DESTROY(bus);
2696 int r;
2697
2698 /* Returns 0 when we didn't do anything. This should cause the
2699 * caller to invoke sd_bus_wait() before returning the next
2700 * time. Returns > 0 when we did something, which possibly
2701 * means *ret is filled in with an unprocessed message. */
2702
2703 assert_return(bus, -EINVAL);
2704 assert_return(!bus_pid_changed(bus), -ECHILD);
2705
2706 /* We don't allow recursively invoking sd_bus_process(). */
2707 assert_return(!bus->current_message, -EBUSY);
2708 assert(!bus->current_slot);
2709
2710 switch (bus->state) {
2711
2712 case BUS_UNSET:
2713 return -ENOTCONN;
2714
2715 case BUS_CLOSED:
2716 return -ECONNRESET;
2717
2718 case BUS_OPENING:
2719 r = bus_socket_process_opening(bus);
2720 if (r == -ENOTCONN || r == -ECONNRESET || r == -EPIPE || r == -ESHUTDOWN) {
2721 bus_enter_closing(bus);
2722 r = 1;
2723 } else if (r < 0)
2724 return r;
2725 if (ret)
2726 *ret = NULL;
2727 return r;
2728
2729 case BUS_AUTHENTICATING:
2730 r = bus_socket_process_authenticating(bus);
2731 if (r == -ENOTCONN || r == -ECONNRESET || r == -EPIPE || r == -ESHUTDOWN) {
2732 bus_enter_closing(bus);
2733 r = 1;
2734 } else if (r < 0)
2735 return r;
2736
2737 if (ret)
2738 *ret = NULL;
2739
2740 return r;
2741
2742 case BUS_RUNNING:
2743 case BUS_HELLO:
2744 r = process_running(bus, hint_priority, priority, ret);
2745 if (r == -ENOTCONN || r == -ECONNRESET || r == -EPIPE || r == -ESHUTDOWN) {
2746 bus_enter_closing(bus);
2747 r = 1;
2748
2749 if (ret)
2750 *ret = NULL;
2751 }
2752
2753 return r;
2754
2755 case BUS_CLOSING:
2756 return process_closing(bus, ret);
2757 }
2758
2759 assert_not_reached("Unknown state");
2760 }
2761
2762 _public_ int sd_bus_process(sd_bus *bus, sd_bus_message **ret) {
2763 return bus_process_internal(bus, false, 0, ret);
2764 }
2765
2766 _public_ int sd_bus_process_priority(sd_bus *bus, int64_t priority, sd_bus_message **ret) {
2767 return bus_process_internal(bus, true, priority, ret);
2768 }
2769
2770 static int bus_poll(sd_bus *bus, bool need_more, uint64_t timeout_usec) {
2771 struct pollfd p[2] = {};
2772 int r, e, n;
2773 struct timespec ts;
2774 usec_t m = USEC_INFINITY;
2775
2776 assert(bus);
2777
2778 if (bus->state == BUS_CLOSING)
2779 return 1;
2780
2781 if (!BUS_IS_OPEN(bus->state))
2782 return -ENOTCONN;
2783
2784 e = sd_bus_get_events(bus);
2785 if (e < 0)
2786 return e;
2787
2788 if (need_more)
2789 /* The caller really needs some more data, he doesn't
2790 * care about what's already read, or any timeouts
2791 * except its own. */
2792 e |= POLLIN;
2793 else {
2794 usec_t until;
2795 /* The caller wants to process if there's something to
2796 * process, but doesn't care otherwise */
2797
2798 r = sd_bus_get_timeout(bus, &until);
2799 if (r < 0)
2800 return r;
2801 if (r > 0) {
2802 usec_t nw;
2803 nw = now(CLOCK_MONOTONIC);
2804 m = until > nw ? until - nw : 0;
2805 }
2806 }
2807
2808 if (timeout_usec != (uint64_t) -1 && (m == (uint64_t) -1 || timeout_usec < m))
2809 m = timeout_usec;
2810
2811 p[0].fd = bus->input_fd;
2812 if (bus->output_fd == bus->input_fd) {
2813 p[0].events = e;
2814 n = 1;
2815 } else {
2816 p[0].events = e & POLLIN;
2817 p[1].fd = bus->output_fd;
2818 p[1].events = e & POLLOUT;
2819 n = 2;
2820 }
2821
2822 r = ppoll(p, n, m == (uint64_t) -1 ? NULL : timespec_store(&ts, m), NULL);
2823 if (r < 0)
2824 return -errno;
2825
2826 return r > 0 ? 1 : 0;
2827 }
2828
2829 _public_ int sd_bus_wait(sd_bus *bus, uint64_t timeout_usec) {
2830
2831 assert_return(bus, -EINVAL);
2832 assert_return(!bus_pid_changed(bus), -ECHILD);
2833
2834 if (bus->state == BUS_CLOSING)
2835 return 0;
2836
2837 if (!BUS_IS_OPEN(bus->state))
2838 return -ENOTCONN;
2839
2840 if (bus->rqueue_size > 0)
2841 return 0;
2842
2843 return bus_poll(bus, false, timeout_usec);
2844 }
2845
2846 _public_ int sd_bus_flush(sd_bus *bus) {
2847 int r;
2848
2849 assert_return(bus, -EINVAL);
2850 assert_return(!bus_pid_changed(bus), -ECHILD);
2851
2852 if (bus->state == BUS_CLOSING)
2853 return 0;
2854
2855 if (!BUS_IS_OPEN(bus->state))
2856 return -ENOTCONN;
2857
2858 r = bus_ensure_running(bus);
2859 if (r < 0)
2860 return r;
2861
2862 if (bus->wqueue_size <= 0)
2863 return 0;
2864
2865 for (;;) {
2866 r = dispatch_wqueue(bus);
2867 if (r < 0) {
2868 if (r == -ENOTCONN || r == -ECONNRESET || r == -EPIPE || r == -ESHUTDOWN) {
2869 bus_enter_closing(bus);
2870 return -ECONNRESET;
2871 }
2872
2873 return r;
2874 }
2875
2876 if (bus->wqueue_size <= 0)
2877 return 0;
2878
2879 r = bus_poll(bus, false, (uint64_t) -1);
2880 if (r < 0)
2881 return r;
2882 }
2883 }
2884
2885 _public_ int sd_bus_add_filter(
2886 sd_bus *bus,
2887 sd_bus_slot **slot,
2888 sd_bus_message_handler_t callback,
2889 void *userdata) {
2890
2891 sd_bus_slot *s;
2892
2893 assert_return(bus, -EINVAL);
2894 assert_return(callback, -EINVAL);
2895 assert_return(!bus_pid_changed(bus), -ECHILD);
2896
2897 s = bus_slot_allocate(bus, !slot, BUS_FILTER_CALLBACK, sizeof(struct filter_callback), userdata);
2898 if (!s)
2899 return -ENOMEM;
2900
2901 s->filter_callback.callback = callback;
2902
2903 bus->filter_callbacks_modified = true;
2904 LIST_PREPEND(callbacks, bus->filter_callbacks, &s->filter_callback);
2905
2906 if (slot)
2907 *slot = s;
2908
2909 return 0;
2910 }
2911
2912 _public_ int sd_bus_add_match(
2913 sd_bus *bus,
2914 sd_bus_slot **slot,
2915 const char *match,
2916 sd_bus_message_handler_t callback,
2917 void *userdata) {
2918
2919 struct bus_match_component *components = NULL;
2920 unsigned n_components = 0;
2921 sd_bus_slot *s = NULL;
2922 int r = 0;
2923
2924 assert_return(bus, -EINVAL);
2925 assert_return(match, -EINVAL);
2926 assert_return(!bus_pid_changed(bus), -ECHILD);
2927
2928 r = bus_match_parse(match, &components, &n_components);
2929 if (r < 0)
2930 goto finish;
2931
2932 s = bus_slot_allocate(bus, !slot, BUS_MATCH_CALLBACK, sizeof(struct match_callback), userdata);
2933 if (!s) {
2934 r = -ENOMEM;
2935 goto finish;
2936 }
2937
2938 s->match_callback.callback = callback;
2939 s->match_callback.cookie = ++bus->match_cookie;
2940
2941 if (bus->bus_client) {
2942 enum bus_match_scope scope;
2943
2944 scope = bus_match_get_scope(components, n_components);
2945
2946 /* Do not install server-side matches for matches
2947 * against the local service, interface or bus
2948 * path. */
2949 if (scope != BUS_MATCH_LOCAL) {
2950
2951 if (!bus->is_kernel) {
2952 /* When this is not a kernel transport, we
2953 * store the original match string, so that we
2954 * can use it to remove the match again */
2955
2956 s->match_callback.match_string = strdup(match);
2957 if (!s->match_callback.match_string) {
2958 r = -ENOMEM;
2959 goto finish;
2960 }
2961 }
2962
2963 r = bus_add_match_internal(bus, s->match_callback.match_string, components, n_components, s->match_callback.cookie);
2964 if (r < 0)
2965 goto finish;
2966
2967 s->match_added = true;
2968 }
2969 }
2970
2971 bus->match_callbacks_modified = true;
2972 r = bus_match_add(&bus->match_callbacks, components, n_components, &s->match_callback);
2973 if (r < 0)
2974 goto finish;
2975
2976 if (slot)
2977 *slot = s;
2978 s = NULL;
2979
2980 finish:
2981 bus_match_parse_free(components, n_components);
2982 sd_bus_slot_unref(s);
2983
2984 return r;
2985 }
2986
2987 int bus_remove_match_by_string(
2988 sd_bus *bus,
2989 const char *match,
2990 sd_bus_message_handler_t callback,
2991 void *userdata) {
2992
2993 struct bus_match_component *components = NULL;
2994 unsigned n_components = 0;
2995 struct match_callback *c;
2996 int r = 0;
2997
2998 assert_return(bus, -EINVAL);
2999 assert_return(match, -EINVAL);
3000 assert_return(!bus_pid_changed(bus), -ECHILD);
3001
3002 r = bus_match_parse(match, &components, &n_components);
3003 if (r < 0)
3004 goto finish;
3005
3006 r = bus_match_find(&bus->match_callbacks, components, n_components, NULL, NULL, &c);
3007 if (r <= 0)
3008 goto finish;
3009
3010 sd_bus_slot_unref(container_of(c, sd_bus_slot, match_callback));
3011
3012 finish:
3013 bus_match_parse_free(components, n_components);
3014
3015 return r;
3016 }
3017
3018 bool bus_pid_changed(sd_bus *bus) {
3019 assert(bus);
3020
3021 /* We don't support people creating a bus connection and
3022 * keeping it around over a fork(). Let's complain. */
3023
3024 return bus->original_pid != getpid();
3025 }
3026
3027 static int io_callback(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
3028 sd_bus *bus = userdata;
3029 int r;
3030
3031 assert(bus);
3032
3033 r = sd_bus_process(bus, NULL);
3034 if (r < 0)
3035 return r;
3036
3037 return 1;
3038 }
3039
3040 static int time_callback(sd_event_source *s, uint64_t usec, void *userdata) {
3041 sd_bus *bus = userdata;
3042 int r;
3043
3044 assert(bus);
3045
3046 r = sd_bus_process(bus, NULL);
3047 if (r < 0)
3048 return r;
3049
3050 return 1;
3051 }
3052
3053 static int prepare_callback(sd_event_source *s, void *userdata) {
3054 sd_bus *bus = userdata;
3055 int r, e;
3056 usec_t until;
3057
3058 assert(s);
3059 assert(bus);
3060
3061 e = sd_bus_get_events(bus);
3062 if (e < 0)
3063 return e;
3064
3065 if (bus->output_fd != bus->input_fd) {
3066
3067 r = sd_event_source_set_io_events(bus->input_io_event_source, e & POLLIN);
3068 if (r < 0)
3069 return r;
3070
3071 r = sd_event_source_set_io_events(bus->output_io_event_source, e & POLLOUT);
3072 if (r < 0)
3073 return r;
3074 } else {
3075 r = sd_event_source_set_io_events(bus->input_io_event_source, e);
3076 if (r < 0)
3077 return r;
3078 }
3079
3080 r = sd_bus_get_timeout(bus, &until);
3081 if (r < 0)
3082 return r;
3083 if (r > 0) {
3084 int j;
3085
3086 j = sd_event_source_set_time(bus->time_event_source, until);
3087 if (j < 0)
3088 return j;
3089 }
3090
3091 r = sd_event_source_set_enabled(bus->time_event_source, r > 0);
3092 if (r < 0)
3093 return r;
3094
3095 return 1;
3096 }
3097
3098 static int quit_callback(sd_event_source *event, void *userdata) {
3099 sd_bus *bus = userdata;
3100
3101 assert(event);
3102
3103 sd_bus_flush(bus);
3104 sd_bus_close(bus);
3105
3106 return 1;
3107 }
3108
3109 static int attach_io_events(sd_bus *bus) {
3110 int r;
3111
3112 assert(bus);
3113
3114 if (bus->input_fd < 0)
3115 return 0;
3116
3117 if (!bus->event)
3118 return 0;
3119
3120 if (!bus->input_io_event_source) {
3121 r = sd_event_add_io(bus->event, &bus->input_io_event_source, bus->input_fd, 0, io_callback, bus);
3122 if (r < 0)
3123 return r;
3124
3125 r = sd_event_source_set_prepare(bus->input_io_event_source, prepare_callback);
3126 if (r < 0)
3127 return r;
3128
3129 r = sd_event_source_set_priority(bus->input_io_event_source, bus->event_priority);
3130 if (r < 0)
3131 return r;
3132
3133 r = sd_event_source_set_description(bus->input_io_event_source, "bus-input");
3134 } else
3135 r = sd_event_source_set_io_fd(bus->input_io_event_source, bus->input_fd);
3136
3137 if (r < 0)
3138 return r;
3139
3140 if (bus->output_fd != bus->input_fd) {
3141 assert(bus->output_fd >= 0);
3142
3143 if (!bus->output_io_event_source) {
3144 r = sd_event_add_io(bus->event, &bus->output_io_event_source, bus->output_fd, 0, io_callback, bus);
3145 if (r < 0)
3146 return r;
3147
3148 r = sd_event_source_set_priority(bus->output_io_event_source, bus->event_priority);
3149 if (r < 0)
3150 return r;
3151
3152 r = sd_event_source_set_description(bus->input_io_event_source, "bus-output");
3153 } else
3154 r = sd_event_source_set_io_fd(bus->output_io_event_source, bus->output_fd);
3155
3156 if (r < 0)
3157 return r;
3158 }
3159
3160 return 0;
3161 }
3162
3163 static void detach_io_events(sd_bus *bus) {
3164 assert(bus);
3165
3166 if (bus->input_io_event_source) {
3167 sd_event_source_set_enabled(bus->input_io_event_source, SD_EVENT_OFF);
3168 bus->input_io_event_source = sd_event_source_unref(bus->input_io_event_source);
3169 }
3170
3171 if (bus->output_io_event_source) {
3172 sd_event_source_set_enabled(bus->output_io_event_source, SD_EVENT_OFF);
3173 bus->output_io_event_source = sd_event_source_unref(bus->output_io_event_source);
3174 }
3175 }
3176
3177 _public_ int sd_bus_attach_event(sd_bus *bus, sd_event *event, int priority) {
3178 int r;
3179
3180 assert_return(bus, -EINVAL);
3181 assert_return(!bus->event, -EBUSY);
3182
3183 assert(!bus->input_io_event_source);
3184 assert(!bus->output_io_event_source);
3185 assert(!bus->time_event_source);
3186
3187 if (event)
3188 bus->event = sd_event_ref(event);
3189 else {
3190 r = sd_event_default(&bus->event);
3191 if (r < 0)
3192 return r;
3193 }
3194
3195 bus->event_priority = priority;
3196
3197 r = sd_event_add_time(bus->event, &bus->time_event_source, CLOCK_MONOTONIC, 0, 0, time_callback, bus);
3198 if (r < 0)
3199 goto fail;
3200
3201 r = sd_event_source_set_priority(bus->time_event_source, priority);
3202 if (r < 0)
3203 goto fail;
3204
3205 r = sd_event_source_set_description(bus->time_event_source, "bus-time");
3206 if (r < 0)
3207 goto fail;
3208
3209 r = sd_event_add_exit(bus->event, &bus->quit_event_source, quit_callback, bus);
3210 if (r < 0)
3211 goto fail;
3212
3213 r = sd_event_source_set_description(bus->quit_event_source, "bus-exit");
3214 if (r < 0)
3215 goto fail;
3216
3217 r = attach_io_events(bus);
3218 if (r < 0)
3219 goto fail;
3220
3221 return 0;
3222
3223 fail:
3224 sd_bus_detach_event(bus);
3225 return r;
3226 }
3227
3228 _public_ int sd_bus_detach_event(sd_bus *bus) {
3229 assert_return(bus, -EINVAL);
3230
3231 if (!bus->event)
3232 return 0;
3233
3234 detach_io_events(bus);
3235
3236 if (bus->time_event_source) {
3237 sd_event_source_set_enabled(bus->time_event_source, SD_EVENT_OFF);
3238 bus->time_event_source = sd_event_source_unref(bus->time_event_source);
3239 }
3240
3241 if (bus->quit_event_source) {
3242 sd_event_source_set_enabled(bus->quit_event_source, SD_EVENT_OFF);
3243 bus->quit_event_source = sd_event_source_unref(bus->quit_event_source);
3244 }
3245
3246 bus->event = sd_event_unref(bus->event);
3247 return 1;
3248 }
3249
3250 _public_ sd_event* sd_bus_get_event(sd_bus *bus) {
3251 assert_return(bus, NULL);
3252
3253 return bus->event;
3254 }
3255
3256 _public_ sd_bus_message* sd_bus_get_current_message(sd_bus *bus) {
3257 assert_return(bus, NULL);
3258
3259 return bus->current_message;
3260 }
3261
3262 _public_ sd_bus_slot* sd_bus_get_current_slot(sd_bus *bus) {
3263 assert_return(bus, NULL);
3264
3265 return bus->current_slot;
3266 }
3267
3268 _public_ sd_bus_message_handler_t sd_bus_get_current_handler(sd_bus *bus) {
3269 assert_return(bus, NULL);
3270
3271 return bus->current_handler;
3272 }
3273
3274 _public_ void* sd_bus_get_current_userdata(sd_bus *bus) {
3275 assert_return(bus, NULL);
3276
3277 return bus->current_userdata;
3278 }
3279
3280 static int bus_default(int (*bus_open)(sd_bus **), sd_bus **default_bus, sd_bus **ret) {
3281 sd_bus *b = NULL;
3282 int r;
3283
3284 assert(bus_open);
3285 assert(default_bus);
3286
3287 if (!ret)
3288 return !!*default_bus;
3289
3290 if (*default_bus) {
3291 *ret = sd_bus_ref(*default_bus);
3292 return 0;
3293 }
3294
3295 r = bus_open(&b);
3296 if (r < 0)
3297 return r;
3298
3299 b->default_bus_ptr = default_bus;
3300 b->tid = gettid();
3301 *default_bus = b;
3302
3303 *ret = b;
3304 return 1;
3305 }
3306
3307 _public_ int sd_bus_default_system(sd_bus **ret) {
3308 static thread_local sd_bus *default_system_bus = NULL;
3309
3310 return bus_default(sd_bus_open_system, &default_system_bus, ret);
3311 }
3312
3313 _public_ int sd_bus_default_user(sd_bus **ret) {
3314 static thread_local sd_bus *default_user_bus = NULL;
3315
3316 return bus_default(sd_bus_open_user, &default_user_bus, ret);
3317 }
3318
3319 _public_ int sd_bus_default(sd_bus **ret) {
3320
3321 const char *e;
3322
3323 /* Let's try our best to reuse another cached connection. If
3324 * the starter bus type is set, connect via our normal
3325 * connection logic, ignoring $DBUS_STARTER_ADDRESS, so that
3326 * we can share the connection with the user/system default
3327 * bus. */
3328
3329 e = secure_getenv("DBUS_STARTER_BUS_TYPE");
3330 if (e) {
3331 if (streq(e, "system"))
3332 return sd_bus_default_system(ret);
3333 else if (STR_IN_SET(e, "user", "session"))
3334 return sd_bus_default_user(ret);
3335 }
3336
3337 /* No type is specified, so we have not other option than to
3338 * use the starter address if it is set. */
3339
3340 e = secure_getenv("DBUS_STARTER_ADDRESS");
3341 if (e) {
3342 static thread_local sd_bus *default_starter_bus = NULL;
3343
3344 return bus_default(sd_bus_open, &default_starter_bus, ret);
3345 }
3346
3347 /* Finally, if nothing is set use the cached connection for
3348 * the right scope */
3349
3350 if (cg_pid_get_owner_uid(0, NULL) >= 0)
3351 return sd_bus_default_user(ret);
3352 else
3353 return sd_bus_default_system(ret);
3354 }
3355
3356 _public_ int sd_bus_get_tid(sd_bus *b, pid_t *tid) {
3357 assert_return(b, -EINVAL);
3358 assert_return(tid, -EINVAL);
3359 assert_return(!bus_pid_changed(b), -ECHILD);
3360
3361 if (b->tid != 0) {
3362 *tid = b->tid;
3363 return 0;
3364 }
3365
3366 if (b->event)
3367 return sd_event_get_tid(b->event, tid);
3368
3369 return -ENXIO;
3370 }
3371
3372 _public_ int sd_bus_path_encode(const char *prefix, const char *external_id, char **ret_path) {
3373 _cleanup_free_ char *e = NULL;
3374 char *ret;
3375
3376 assert_return(object_path_is_valid(prefix), -EINVAL);
3377 assert_return(external_id, -EINVAL);
3378 assert_return(ret_path, -EINVAL);
3379
3380 e = bus_label_escape(external_id);
3381 if (!e)
3382 return -ENOMEM;
3383
3384 ret = strjoin(prefix, "/", e, NULL);
3385 if (!ret)
3386 return -ENOMEM;
3387
3388 *ret_path = ret;
3389 return 0;
3390 }
3391
3392 _public_ int sd_bus_path_decode(const char *path, const char *prefix, char **external_id) {
3393 const char *e;
3394 char *ret;
3395
3396 assert_return(object_path_is_valid(path), -EINVAL);
3397 assert_return(object_path_is_valid(prefix), -EINVAL);
3398 assert_return(external_id, -EINVAL);
3399
3400 e = object_path_startswith(path, prefix);
3401 if (!e) {
3402 *external_id = NULL;
3403 return 0;
3404 }
3405
3406 ret = bus_label_unescape(e);
3407 if (!ret)
3408 return -ENOMEM;
3409
3410 *external_id = ret;
3411 return 1;
3412 }
3413
3414 _public_ int sd_bus_try_close(sd_bus *bus) {
3415 int r;
3416
3417 assert_return(bus, -EINVAL);
3418 assert_return(!bus_pid_changed(bus), -ECHILD);
3419
3420 if (!bus->is_kernel)
3421 return -EOPNOTSUPP;
3422
3423 if (!BUS_IS_OPEN(bus->state))
3424 return -ENOTCONN;
3425
3426 if (bus->rqueue_size > 0)
3427 return -EBUSY;
3428
3429 if (bus->wqueue_size > 0)
3430 return -EBUSY;
3431
3432 r = bus_kernel_try_close(bus);
3433 if (r < 0)
3434 return r;
3435
3436 sd_bus_close(bus);
3437 return 0;
3438 }
3439
3440 _public_ int sd_bus_get_description(sd_bus *bus, const char **description) {
3441 assert_return(bus, -EINVAL);
3442 assert_return(description, -EINVAL);
3443 assert_return(bus->description, -ENXIO);
3444 assert_return(!bus_pid_changed(bus), -ECHILD);
3445
3446 *description = bus->description;
3447 return 0;
3448 }
3449
3450 int bus_get_root_path(sd_bus *bus) {
3451 int r;
3452
3453 if (bus->cgroup_root)
3454 return 0;
3455
3456 r = cg_get_root_path(&bus->cgroup_root);
3457 if (r == -ENOENT) {
3458 bus->cgroup_root = strdup("/");
3459 if (!bus->cgroup_root)
3460 return -ENOMEM;
3461
3462 r = 0;
3463 }
3464
3465 return r;
3466 }
3467
3468 _public_ int sd_bus_get_scope(sd_bus *bus, const char **scope) {
3469 int r;
3470
3471 assert_return(bus, -EINVAL);
3472 assert_return(scope, -EINVAL);
3473 assert_return(!bus_pid_changed(bus), -ECHILD);
3474
3475 if (bus->is_kernel) {
3476 _cleanup_free_ char *n = NULL;
3477 const char *dash;
3478
3479 r = bus_kernel_get_bus_name(bus, &n);
3480 if (r < 0)
3481 return r;
3482
3483 if (streq(n, "0-system")) {
3484 *scope = "system";
3485 return 0;
3486 }
3487
3488 dash = strchr(n, '-');
3489 if (streq_ptr(dash, "-user")) {
3490 *scope = "user";
3491 return 0;
3492 }
3493 }
3494
3495 if (bus->is_user) {
3496 *scope = "user";
3497 return 0;
3498 }
3499
3500 if (bus->is_system) {
3501 *scope = "system";
3502 return 0;
3503 }
3504
3505 return -ENODATA;
3506 }
3507
3508 _public_ int sd_bus_get_address(sd_bus *bus, const char **address) {
3509
3510 assert_return(bus, -EINVAL);
3511 assert_return(address, -EINVAL);
3512 assert_return(!bus_pid_changed(bus), -ECHILD);
3513
3514 if (bus->address) {
3515 *address = bus->address;
3516 return 0;
3517 }
3518
3519 return -ENODATA;
3520 }
3521
3522 _public_ int sd_bus_get_creds_mask(sd_bus *bus, uint64_t *mask) {
3523 assert_return(bus, -EINVAL);
3524 assert_return(mask, -EINVAL);
3525 assert_return(!bus_pid_changed(bus), -ECHILD);
3526
3527 *mask = bus->creds_mask;
3528 return 0;
3529 }
3530
3531 _public_ int sd_bus_is_bus_client(sd_bus *bus) {
3532 assert_return(bus, -EINVAL);
3533 assert_return(!bus_pid_changed(bus), -ECHILD);
3534
3535 return bus->bus_client;
3536 }
3537
3538 _public_ int sd_bus_is_server(sd_bus *bus) {
3539 assert_return(bus, -EINVAL);
3540 assert_return(!bus_pid_changed(bus), -ECHILD);
3541
3542 return bus->is_server;
3543 }
3544
3545 _public_ int sd_bus_is_anonymous(sd_bus *bus) {
3546 assert_return(bus, -EINVAL);
3547 assert_return(!bus_pid_changed(bus), -ECHILD);
3548
3549 return bus->anonymous_auth;
3550 }
3551
3552 _public_ int sd_bus_is_trusted(sd_bus *bus) {
3553 assert_return(bus, -EINVAL);
3554 assert_return(!bus_pid_changed(bus), -ECHILD);
3555
3556 return bus->trusted;
3557 }
3558
3559 _public_ int sd_bus_is_monitor(sd_bus *bus) {
3560 assert_return(bus, -EINVAL);
3561 assert_return(!bus_pid_changed(bus), -ECHILD);
3562
3563 return !!(bus->hello_flags & KDBUS_HELLO_MONITOR);
3564 }
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