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Merge pull request #265 from smcv/logind-runtimedir-race-write-earlier
[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 >= 0)
77 safe_close(b->input_fd);
78
79 if (b->output_fd >= 0 && b->output_fd != b->input_fd)
80 safe_close(b->output_fd);
81
82 b->input_fd = b->output_fd = -1;
83 }
84
85 static void bus_reset_queues(sd_bus *b) {
86 assert(b);
87
88 while (b->rqueue_size > 0)
89 sd_bus_message_unref(b->rqueue[--b->rqueue_size]);
90
91 free(b->rqueue);
92 b->rqueue = NULL;
93 b->rqueue_allocated = 0;
94
95 while (b->wqueue_size > 0)
96 sd_bus_message_unref(b->wqueue[--b->wqueue_size]);
97
98 free(b->wqueue);
99 b->wqueue = NULL;
100 b->wqueue_allocated = 0;
101 }
102
103 static void bus_free(sd_bus *b) {
104 sd_bus_slot *s;
105
106 assert(b);
107 assert(!b->track_queue);
108
109 b->state = BUS_CLOSED;
110
111 sd_bus_detach_event(b);
112
113 while ((s = b->slots)) {
114 /* At this point only floating slots can still be
115 * around, because the non-floating ones keep a
116 * reference to the bus, and we thus couldn't be
117 * destructing right now... We forcibly disconnect the
118 * slots here, so that they still can be referenced by
119 * apps, but are dead. */
120
121 assert(s->floating);
122 bus_slot_disconnect(s);
123 sd_bus_slot_unref(s);
124 }
125
126 if (b->default_bus_ptr)
127 *b->default_bus_ptr = NULL;
128
129 bus_close_fds(b);
130
131 if (b->kdbus_buffer)
132 munmap(b->kdbus_buffer, KDBUS_POOL_SIZE);
133
134 free(b->label);
135 free(b->rbuffer);
136 free(b->unique_name);
137 free(b->auth_buffer);
138 free(b->address);
139 free(b->kernel);
140 free(b->machine);
141 free(b->fake_label);
142 free(b->cgroup_root);
143 free(b->description);
144
145 free(b->exec_path);
146 strv_free(b->exec_argv);
147
148 close_many(b->fds, b->n_fds);
149 free(b->fds);
150
151 bus_reset_queues(b);
152
153 ordered_hashmap_free_free(b->reply_callbacks);
154 prioq_free(b->reply_callbacks_prioq);
155
156 assert(b->match_callbacks.type == BUS_MATCH_ROOT);
157 bus_match_free(&b->match_callbacks);
158
159 hashmap_free_free(b->vtable_methods);
160 hashmap_free_free(b->vtable_properties);
161
162 assert(hashmap_isempty(b->nodes));
163 hashmap_free(b->nodes);
164
165 bus_kernel_flush_memfd(b);
166
167 assert_se(pthread_mutex_destroy(&b->memfd_cache_mutex) == 0);
168
169 free(b);
170 }
171
172 _public_ int sd_bus_new(sd_bus **ret) {
173 sd_bus *r;
174
175 assert_return(ret, -EINVAL);
176
177 r = new0(sd_bus, 1);
178 if (!r)
179 return -ENOMEM;
180
181 r->n_ref = REFCNT_INIT;
182 r->input_fd = r->output_fd = -1;
183 r->message_version = 1;
184 r->creds_mask |= SD_BUS_CREDS_WELL_KNOWN_NAMES|SD_BUS_CREDS_UNIQUE_NAME;
185 r->hello_flags |= KDBUS_HELLO_ACCEPT_FD;
186 r->attach_flags |= KDBUS_ATTACH_NAMES;
187 r->original_pid = getpid();
188
189 assert_se(pthread_mutex_init(&r->memfd_cache_mutex, NULL) == 0);
190
191 /* We guarantee that wqueue always has space for at least one
192 * entry */
193 if (!GREEDY_REALLOC(r->wqueue, r->wqueue_allocated, 1)) {
194 free(r);
195 return -ENOMEM;
196 }
197
198 *ret = r;
199 return 0;
200 }
201
202 _public_ int sd_bus_set_address(sd_bus *bus, const char *address) {
203 char *a;
204
205 assert_return(bus, -EINVAL);
206 assert_return(bus->state == BUS_UNSET, -EPERM);
207 assert_return(address, -EINVAL);
208 assert_return(!bus_pid_changed(bus), -ECHILD);
209
210 a = strdup(address);
211 if (!a)
212 return -ENOMEM;
213
214 free(bus->address);
215 bus->address = a;
216
217 return 0;
218 }
219
220 _public_ int sd_bus_set_fd(sd_bus *bus, int input_fd, int output_fd) {
221 assert_return(bus, -EINVAL);
222 assert_return(bus->state == BUS_UNSET, -EPERM);
223 assert_return(input_fd >= 0, -EINVAL);
224 assert_return(output_fd >= 0, -EINVAL);
225 assert_return(!bus_pid_changed(bus), -ECHILD);
226
227 bus->input_fd = input_fd;
228 bus->output_fd = output_fd;
229 return 0;
230 }
231
232 _public_ int sd_bus_set_exec(sd_bus *bus, const char *path, char *const argv[]) {
233 char *p, **a;
234
235 assert_return(bus, -EINVAL);
236 assert_return(bus->state == BUS_UNSET, -EPERM);
237 assert_return(path, -EINVAL);
238 assert_return(!strv_isempty(argv), -EINVAL);
239 assert_return(!bus_pid_changed(bus), -ECHILD);
240
241 p = strdup(path);
242 if (!p)
243 return -ENOMEM;
244
245 a = strv_copy(argv);
246 if (!a) {
247 free(p);
248 return -ENOMEM;
249 }
250
251 free(bus->exec_path);
252 strv_free(bus->exec_argv);
253
254 bus->exec_path = p;
255 bus->exec_argv = a;
256
257 return 0;
258 }
259
260 _public_ int sd_bus_set_bus_client(sd_bus *bus, int b) {
261 assert_return(bus, -EINVAL);
262 assert_return(bus->state == BUS_UNSET, -EPERM);
263 assert_return(!bus_pid_changed(bus), -ECHILD);
264
265 bus->bus_client = !!b;
266 return 0;
267 }
268
269 _public_ int sd_bus_set_monitor(sd_bus *bus, int b) {
270 assert_return(bus, -EINVAL);
271 assert_return(bus->state == BUS_UNSET, -EPERM);
272 assert_return(!bus_pid_changed(bus), -ECHILD);
273
274 SET_FLAG(bus->hello_flags, KDBUS_HELLO_MONITOR, b);
275 return 0;
276 }
277
278 _public_ int sd_bus_negotiate_fds(sd_bus *bus, int b) {
279 assert_return(bus, -EINVAL);
280 assert_return(bus->state == BUS_UNSET, -EPERM);
281 assert_return(!bus_pid_changed(bus), -ECHILD);
282
283 SET_FLAG(bus->hello_flags, KDBUS_HELLO_ACCEPT_FD, b);
284 return 0;
285 }
286
287 _public_ int sd_bus_negotiate_timestamp(sd_bus *bus, int b) {
288 uint64_t new_flags;
289 assert_return(bus, -EINVAL);
290 assert_return(!IN_SET(bus->state, BUS_CLOSING, BUS_CLOSED), -EPERM);
291 assert_return(!bus_pid_changed(bus), -ECHILD);
292
293 new_flags = bus->attach_flags;
294 SET_FLAG(new_flags, KDBUS_ATTACH_TIMESTAMP, b);
295
296 if (bus->attach_flags == new_flags)
297 return 0;
298
299 bus->attach_flags = new_flags;
300 if (bus->state != BUS_UNSET && bus->is_kernel)
301 bus_kernel_realize_attach_flags(bus);
302
303 return 0;
304 }
305
306 _public_ int sd_bus_negotiate_creds(sd_bus *bus, int b, uint64_t mask) {
307 uint64_t new_flags;
308
309 assert_return(bus, -EINVAL);
310 assert_return(mask <= _SD_BUS_CREDS_ALL, -EINVAL);
311 assert_return(!IN_SET(bus->state, BUS_CLOSING, BUS_CLOSED), -EPERM);
312 assert_return(!bus_pid_changed(bus), -ECHILD);
313
314 if (b)
315 bus->creds_mask |= mask;
316 else
317 bus->creds_mask &= ~mask;
318
319 /* The well knowns we need unconditionally, so that matches can work */
320 bus->creds_mask |= SD_BUS_CREDS_WELL_KNOWN_NAMES|SD_BUS_CREDS_UNIQUE_NAME;
321
322 /* Make sure we don't lose the timestamp flag */
323 new_flags = (bus->attach_flags & KDBUS_ATTACH_TIMESTAMP) | attach_flags_to_kdbus(bus->creds_mask);
324 if (bus->attach_flags == new_flags)
325 return 0;
326
327 bus->attach_flags = new_flags;
328 if (bus->state != BUS_UNSET && bus->is_kernel)
329 bus_kernel_realize_attach_flags(bus);
330
331 return 0;
332 }
333
334 _public_ int sd_bus_set_server(sd_bus *bus, int b, sd_id128_t server_id) {
335 assert_return(bus, -EINVAL);
336 assert_return(b || sd_id128_equal(server_id, SD_ID128_NULL), -EINVAL);
337 assert_return(bus->state == BUS_UNSET, -EPERM);
338 assert_return(!bus_pid_changed(bus), -ECHILD);
339
340 bus->is_server = !!b;
341 bus->server_id = server_id;
342 return 0;
343 }
344
345 _public_ int sd_bus_set_anonymous(sd_bus *bus, int b) {
346 assert_return(bus, -EINVAL);
347 assert_return(bus->state == BUS_UNSET, -EPERM);
348 assert_return(!bus_pid_changed(bus), -ECHILD);
349
350 bus->anonymous_auth = !!b;
351 return 0;
352 }
353
354 _public_ int sd_bus_set_trusted(sd_bus *bus, int b) {
355 assert_return(bus, -EINVAL);
356 assert_return(bus->state == BUS_UNSET, -EPERM);
357 assert_return(!bus_pid_changed(bus), -ECHILD);
358
359 bus->trusted = !!b;
360 return 0;
361 }
362
363 _public_ int sd_bus_set_description(sd_bus *bus, const char *description) {
364 assert_return(bus, -EINVAL);
365 assert_return(bus->state == BUS_UNSET, -EPERM);
366 assert_return(!bus_pid_changed(bus), -ECHILD);
367
368 return free_and_strdup(&bus->description, description);
369 }
370
371 _public_ int sd_bus_set_allow_interactive_authorization(sd_bus *bus, int b) {
372 assert_return(bus, -EINVAL);
373 assert_return(!bus_pid_changed(bus), -ECHILD);
374
375 bus->allow_interactive_authorization = !!b;
376 return 0;
377 }
378
379 _public_ int sd_bus_get_allow_interactive_authorization(sd_bus *bus) {
380 assert_return(bus, -EINVAL);
381 assert_return(!bus_pid_changed(bus), -ECHILD);
382
383 return bus->allow_interactive_authorization;
384 }
385
386 static int hello_callback(sd_bus_message *reply, void *userdata, sd_bus_error *error) {
387 const char *s;
388 sd_bus *bus;
389 int r;
390
391 assert(reply);
392 bus = reply->bus;
393 assert(bus);
394 assert(bus->state == BUS_HELLO || bus->state == BUS_CLOSING);
395
396 r = sd_bus_message_get_errno(reply);
397 if (r > 0)
398 return -r;
399
400 r = sd_bus_message_read(reply, "s", &s);
401 if (r < 0)
402 return r;
403
404 if (!service_name_is_valid(s) || s[0] != ':')
405 return -EBADMSG;
406
407 bus->unique_name = strdup(s);
408 if (!bus->unique_name)
409 return -ENOMEM;
410
411 if (bus->state == BUS_HELLO)
412 bus->state = BUS_RUNNING;
413
414 return 1;
415 }
416
417 static int bus_send_hello(sd_bus *bus) {
418 _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
419 int r;
420
421 assert(bus);
422
423 if (!bus->bus_client || bus->is_kernel)
424 return 0;
425
426 r = sd_bus_message_new_method_call(
427 bus,
428 &m,
429 "org.freedesktop.DBus",
430 "/org/freedesktop/DBus",
431 "org.freedesktop.DBus",
432 "Hello");
433 if (r < 0)
434 return r;
435
436 return sd_bus_call_async(bus, NULL, m, hello_callback, NULL, 0);
437 }
438
439 int bus_start_running(sd_bus *bus) {
440 assert(bus);
441
442 if (bus->bus_client && !bus->is_kernel) {
443 bus->state = BUS_HELLO;
444 return 1;
445 }
446
447 bus->state = BUS_RUNNING;
448 return 1;
449 }
450
451 static int parse_address_key(const char **p, const char *key, char **value) {
452 size_t l, n = 0, allocated = 0;
453 const char *a;
454 char *r = NULL;
455
456 assert(p);
457 assert(*p);
458 assert(value);
459
460 if (key) {
461 l = strlen(key);
462 if (strncmp(*p, key, l) != 0)
463 return 0;
464
465 if ((*p)[l] != '=')
466 return 0;
467
468 if (*value)
469 return -EINVAL;
470
471 a = *p + l + 1;
472 } else
473 a = *p;
474
475 while (*a != ';' && *a != ',' && *a != 0) {
476 char c;
477
478 if (*a == '%') {
479 int x, y;
480
481 x = unhexchar(a[1]);
482 if (x < 0) {
483 free(r);
484 return x;
485 }
486
487 y = unhexchar(a[2]);
488 if (y < 0) {
489 free(r);
490 return y;
491 }
492
493 c = (char) ((x << 4) | y);
494 a += 3;
495 } else {
496 c = *a;
497 a++;
498 }
499
500 if (!GREEDY_REALLOC(r, allocated, n + 2))
501 return -ENOMEM;
502
503 r[n++] = c;
504 }
505
506 if (!r) {
507 r = strdup("");
508 if (!r)
509 return -ENOMEM;
510 } else
511 r[n] = 0;
512
513 if (*a == ',')
514 a++;
515
516 *p = a;
517
518 free(*value);
519 *value = r;
520
521 return 1;
522 }
523
524 static void skip_address_key(const char **p) {
525 assert(p);
526 assert(*p);
527
528 *p += strcspn(*p, ",");
529
530 if (**p == ',')
531 (*p) ++;
532 }
533
534 static int parse_unix_address(sd_bus *b, const char **p, char **guid) {
535 _cleanup_free_ char *path = NULL, *abstract = NULL;
536 size_t l;
537 int r;
538
539 assert(b);
540 assert(p);
541 assert(*p);
542 assert(guid);
543
544 while (**p != 0 && **p != ';') {
545 r = parse_address_key(p, "guid", guid);
546 if (r < 0)
547 return r;
548 else if (r > 0)
549 continue;
550
551 r = parse_address_key(p, "path", &path);
552 if (r < 0)
553 return r;
554 else if (r > 0)
555 continue;
556
557 r = parse_address_key(p, "abstract", &abstract);
558 if (r < 0)
559 return r;
560 else if (r > 0)
561 continue;
562
563 skip_address_key(p);
564 }
565
566 if (!path && !abstract)
567 return -EINVAL;
568
569 if (path && abstract)
570 return -EINVAL;
571
572 if (path) {
573 l = strlen(path);
574 if (l > sizeof(b->sockaddr.un.sun_path))
575 return -E2BIG;
576
577 b->sockaddr.un.sun_family = AF_UNIX;
578 strncpy(b->sockaddr.un.sun_path, path, sizeof(b->sockaddr.un.sun_path));
579 b->sockaddr_size = offsetof(struct sockaddr_un, sun_path) + l;
580 } else if (abstract) {
581 l = strlen(abstract);
582 if (l > sizeof(b->sockaddr.un.sun_path) - 1)
583 return -E2BIG;
584
585 b->sockaddr.un.sun_family = AF_UNIX;
586 b->sockaddr.un.sun_path[0] = 0;
587 strncpy(b->sockaddr.un.sun_path+1, abstract, sizeof(b->sockaddr.un.sun_path)-1);
588 b->sockaddr_size = offsetof(struct sockaddr_un, sun_path) + 1 + l;
589 }
590
591 return 0;
592 }
593
594 static int parse_tcp_address(sd_bus *b, const char **p, char **guid) {
595 _cleanup_free_ char *host = NULL, *port = NULL, *family = NULL;
596 int r;
597 struct addrinfo *result, hints = {
598 .ai_socktype = SOCK_STREAM,
599 .ai_flags = AI_ADDRCONFIG,
600 };
601
602 assert(b);
603 assert(p);
604 assert(*p);
605 assert(guid);
606
607 while (**p != 0 && **p != ';') {
608 r = parse_address_key(p, "guid", guid);
609 if (r < 0)
610 return r;
611 else if (r > 0)
612 continue;
613
614 r = parse_address_key(p, "host", &host);
615 if (r < 0)
616 return r;
617 else if (r > 0)
618 continue;
619
620 r = parse_address_key(p, "port", &port);
621 if (r < 0)
622 return r;
623 else if (r > 0)
624 continue;
625
626 r = parse_address_key(p, "family", &family);
627 if (r < 0)
628 return r;
629 else if (r > 0)
630 continue;
631
632 skip_address_key(p);
633 }
634
635 if (!host || !port)
636 return -EINVAL;
637
638 if (family) {
639 if (streq(family, "ipv4"))
640 hints.ai_family = AF_INET;
641 else if (streq(family, "ipv6"))
642 hints.ai_family = AF_INET6;
643 else
644 return -EINVAL;
645 }
646
647 r = getaddrinfo(host, port, &hints, &result);
648 if (r == EAI_SYSTEM)
649 return -errno;
650 else if (r != 0)
651 return -EADDRNOTAVAIL;
652
653 memcpy(&b->sockaddr, result->ai_addr, result->ai_addrlen);
654 b->sockaddr_size = result->ai_addrlen;
655
656 freeaddrinfo(result);
657
658 return 0;
659 }
660
661 static int parse_exec_address(sd_bus *b, const char **p, char **guid) {
662 char *path = NULL;
663 unsigned n_argv = 0, j;
664 char **argv = NULL;
665 size_t allocated = 0;
666 int r;
667
668 assert(b);
669 assert(p);
670 assert(*p);
671 assert(guid);
672
673 while (**p != 0 && **p != ';') {
674 r = parse_address_key(p, "guid", guid);
675 if (r < 0)
676 goto fail;
677 else if (r > 0)
678 continue;
679
680 r = parse_address_key(p, "path", &path);
681 if (r < 0)
682 goto fail;
683 else if (r > 0)
684 continue;
685
686 if (startswith(*p, "argv")) {
687 unsigned ul;
688
689 errno = 0;
690 ul = strtoul(*p + 4, (char**) p, 10);
691 if (errno > 0 || **p != '=' || ul > 256) {
692 r = -EINVAL;
693 goto fail;
694 }
695
696 (*p) ++;
697
698 if (ul >= n_argv) {
699 if (!GREEDY_REALLOC0(argv, allocated, ul + 2)) {
700 r = -ENOMEM;
701 goto fail;
702 }
703
704 n_argv = ul + 1;
705 }
706
707 r = parse_address_key(p, NULL, argv + ul);
708 if (r < 0)
709 goto fail;
710
711 continue;
712 }
713
714 skip_address_key(p);
715 }
716
717 if (!path) {
718 r = -EINVAL;
719 goto fail;
720 }
721
722 /* Make sure there are no holes in the array, with the
723 * exception of argv[0] */
724 for (j = 1; j < n_argv; j++)
725 if (!argv[j]) {
726 r = -EINVAL;
727 goto fail;
728 }
729
730 if (argv && argv[0] == NULL) {
731 argv[0] = strdup(path);
732 if (!argv[0]) {
733 r = -ENOMEM;
734 goto fail;
735 }
736 }
737
738 b->exec_path = path;
739 b->exec_argv = argv;
740 return 0;
741
742 fail:
743 for (j = 0; j < n_argv; j++)
744 free(argv[j]);
745
746 free(argv);
747 free(path);
748 return r;
749 }
750
751 static int parse_kernel_address(sd_bus *b, const char **p, char **guid) {
752 _cleanup_free_ char *path = NULL;
753 int r;
754
755 assert(b);
756 assert(p);
757 assert(*p);
758 assert(guid);
759
760 while (**p != 0 && **p != ';') {
761 r = parse_address_key(p, "guid", guid);
762 if (r < 0)
763 return r;
764 else if (r > 0)
765 continue;
766
767 r = parse_address_key(p, "path", &path);
768 if (r < 0)
769 return r;
770 else if (r > 0)
771 continue;
772
773 skip_address_key(p);
774 }
775
776 if (!path)
777 return -EINVAL;
778
779 free(b->kernel);
780 b->kernel = path;
781 path = NULL;
782
783 return 0;
784 }
785
786 static int parse_container_unix_address(sd_bus *b, const char **p, char **guid) {
787 _cleanup_free_ char *machine = NULL, *pid = NULL;
788 int r;
789
790 assert(b);
791 assert(p);
792 assert(*p);
793 assert(guid);
794
795 while (**p != 0 && **p != ';') {
796 r = parse_address_key(p, "guid", guid);
797 if (r < 0)
798 return r;
799 else if (r > 0)
800 continue;
801
802 r = parse_address_key(p, "machine", &machine);
803 if (r < 0)
804 return r;
805 else if (r > 0)
806 continue;
807
808 r = parse_address_key(p, "pid", &pid);
809 if (r < 0)
810 return r;
811 else if (r > 0)
812 continue;
813
814 skip_address_key(p);
815 }
816
817 if (!machine == !pid)
818 return -EINVAL;
819
820 if (machine) {
821 if (!machine_name_is_valid(machine))
822 return -EINVAL;
823
824 free(b->machine);
825 b->machine = machine;
826 machine = NULL;
827 } else {
828 free(b->machine);
829 b->machine = NULL;
830 }
831
832 if (pid) {
833 r = parse_pid(pid, &b->nspid);
834 if (r < 0)
835 return r;
836 } else
837 b->nspid = 0;
838
839 b->sockaddr.un.sun_family = AF_UNIX;
840 strncpy(b->sockaddr.un.sun_path, "/var/run/dbus/system_bus_socket", sizeof(b->sockaddr.un.sun_path));
841 b->sockaddr_size = offsetof(struct sockaddr_un, sun_path) + strlen("/var/run/dbus/system_bus_socket");
842
843 return 0;
844 }
845
846 static int parse_container_kernel_address(sd_bus *b, const char **p, char **guid) {
847 _cleanup_free_ char *machine = NULL, *pid = NULL;
848 int r;
849
850 assert(b);
851 assert(p);
852 assert(*p);
853 assert(guid);
854
855 while (**p != 0 && **p != ';') {
856 r = parse_address_key(p, "guid", guid);
857 if (r < 0)
858 return r;
859 else if (r > 0)
860 continue;
861
862 r = parse_address_key(p, "machine", &machine);
863 if (r < 0)
864 return r;
865 else if (r > 0)
866 continue;
867
868 r = parse_address_key(p, "pid", &pid);
869 if (r < 0)
870 return r;
871 else if (r > 0)
872 continue;
873
874 skip_address_key(p);
875 }
876
877 if (!machine == !pid)
878 return -EINVAL;
879
880 if (machine) {
881 if (!machine_name_is_valid(machine))
882 return -EINVAL;
883
884 free(b->machine);
885 b->machine = machine;
886 machine = NULL;
887 } else {
888 free(b->machine);
889 b->machine = NULL;
890 }
891
892 if (pid) {
893 r = parse_pid(pid, &b->nspid);
894 if (r < 0)
895 return r;
896 } else
897 b->nspid = 0;
898
899 free(b->kernel);
900 b->kernel = strdup("/sys/fs/kdbus/0-system/bus");
901 if (!b->kernel)
902 return -ENOMEM;
903
904 return 0;
905 }
906
907 static void bus_reset_parsed_address(sd_bus *b) {
908 assert(b);
909
910 zero(b->sockaddr);
911 b->sockaddr_size = 0;
912 strv_free(b->exec_argv);
913 free(b->exec_path);
914 b->exec_path = NULL;
915 b->exec_argv = NULL;
916 b->server_id = SD_ID128_NULL;
917 free(b->kernel);
918 b->kernel = NULL;
919 free(b->machine);
920 b->machine = NULL;
921 b->nspid = 0;
922 }
923
924 static int bus_parse_next_address(sd_bus *b) {
925 _cleanup_free_ char *guid = NULL;
926 const char *a;
927 int r;
928
929 assert(b);
930
931 if (!b->address)
932 return 0;
933 if (b->address[b->address_index] == 0)
934 return 0;
935
936 bus_reset_parsed_address(b);
937
938 a = b->address + b->address_index;
939
940 while (*a != 0) {
941
942 if (*a == ';') {
943 a++;
944 continue;
945 }
946
947 if (startswith(a, "unix:")) {
948 a += 5;
949
950 r = parse_unix_address(b, &a, &guid);
951 if (r < 0)
952 return r;
953 break;
954
955 } else if (startswith(a, "tcp:")) {
956
957 a += 4;
958 r = parse_tcp_address(b, &a, &guid);
959 if (r < 0)
960 return r;
961
962 break;
963
964 } else if (startswith(a, "unixexec:")) {
965
966 a += 9;
967 r = parse_exec_address(b, &a, &guid);
968 if (r < 0)
969 return r;
970
971 break;
972
973 } else if (startswith(a, "kernel:")) {
974
975 a += 7;
976 r = parse_kernel_address(b, &a, &guid);
977 if (r < 0)
978 return r;
979
980 break;
981 } else if (startswith(a, "x-machine-unix:")) {
982
983 a += 15;
984 r = parse_container_unix_address(b, &a, &guid);
985 if (r < 0)
986 return r;
987
988 break;
989 } else if (startswith(a, "x-machine-kernel:")) {
990
991 a += 17;
992 r = parse_container_kernel_address(b, &a, &guid);
993 if (r < 0)
994 return r;
995
996 break;
997 }
998
999 a = strchr(a, ';');
1000 if (!a)
1001 return 0;
1002 }
1003
1004 if (guid) {
1005 r = sd_id128_from_string(guid, &b->server_id);
1006 if (r < 0)
1007 return r;
1008 }
1009
1010 b->address_index = a - b->address;
1011 return 1;
1012 }
1013
1014 static int bus_start_address(sd_bus *b) {
1015 int r;
1016
1017 assert(b);
1018
1019 for (;;) {
1020 bool skipped = false;
1021
1022 bus_close_fds(b);
1023
1024 if (b->exec_path)
1025 r = bus_socket_exec(b);
1026 else if ((b->nspid > 0 || b->machine) && b->kernel)
1027 r = bus_container_connect_kernel(b);
1028 else if ((b->nspid > 0 || b->machine) && b->sockaddr.sa.sa_family != AF_UNSPEC)
1029 r = bus_container_connect_socket(b);
1030 else if (b->kernel)
1031 r = bus_kernel_connect(b);
1032 else if (b->sockaddr.sa.sa_family != AF_UNSPEC)
1033 r = bus_socket_connect(b);
1034 else
1035 skipped = true;
1036
1037 if (!skipped) {
1038 if (r >= 0) {
1039 r = attach_io_events(b);
1040 if (r >= 0)
1041 return r;
1042 }
1043
1044 b->last_connect_error = -r;
1045 }
1046
1047 r = bus_parse_next_address(b);
1048 if (r < 0)
1049 return r;
1050 if (r == 0)
1051 return b->last_connect_error ? -b->last_connect_error : -ECONNREFUSED;
1052 }
1053 }
1054
1055 int bus_next_address(sd_bus *b) {
1056 assert(b);
1057
1058 bus_reset_parsed_address(b);
1059 return bus_start_address(b);
1060 }
1061
1062 static int bus_start_fd(sd_bus *b) {
1063 struct stat st;
1064 int r;
1065
1066 assert(b);
1067 assert(b->input_fd >= 0);
1068 assert(b->output_fd >= 0);
1069
1070 r = fd_nonblock(b->input_fd, true);
1071 if (r < 0)
1072 return r;
1073
1074 r = fd_cloexec(b->input_fd, true);
1075 if (r < 0)
1076 return r;
1077
1078 if (b->input_fd != b->output_fd) {
1079 r = fd_nonblock(b->output_fd, true);
1080 if (r < 0)
1081 return r;
1082
1083 r = fd_cloexec(b->output_fd, true);
1084 if (r < 0)
1085 return r;
1086 }
1087
1088 if (fstat(b->input_fd, &st) < 0)
1089 return -errno;
1090
1091 if (S_ISCHR(b->input_fd))
1092 return bus_kernel_take_fd(b);
1093 else
1094 return bus_socket_take_fd(b);
1095 }
1096
1097 _public_ int sd_bus_start(sd_bus *bus) {
1098 int r;
1099
1100 assert_return(bus, -EINVAL);
1101 assert_return(bus->state == BUS_UNSET, -EPERM);
1102 assert_return(!bus_pid_changed(bus), -ECHILD);
1103
1104 bus->state = BUS_OPENING;
1105
1106 if (bus->is_server && bus->bus_client)
1107 return -EINVAL;
1108
1109 if (bus->input_fd >= 0)
1110 r = bus_start_fd(bus);
1111 else if (bus->address || bus->sockaddr.sa.sa_family != AF_UNSPEC || bus->exec_path || bus->kernel || bus->machine)
1112 r = bus_start_address(bus);
1113 else
1114 return -EINVAL;
1115
1116 if (r < 0) {
1117 sd_bus_close(bus);
1118 return r;
1119 }
1120
1121 return bus_send_hello(bus);
1122 }
1123
1124 _public_ int sd_bus_open(sd_bus **ret) {
1125 const char *e;
1126 sd_bus *b;
1127 int r;
1128
1129 assert_return(ret, -EINVAL);
1130
1131 /* Let's connect to the starter bus if it is set, and
1132 * otherwise to the bus that is appropropriate for the scope
1133 * we are running in */
1134
1135 e = secure_getenv("DBUS_STARTER_BUS_TYPE");
1136 if (e) {
1137 if (streq(e, "system"))
1138 return sd_bus_open_system(ret);
1139 else if (STR_IN_SET(e, "session", "user"))
1140 return sd_bus_open_user(ret);
1141 }
1142
1143 e = secure_getenv("DBUS_STARTER_ADDRESS");
1144 if (!e) {
1145 if (cg_pid_get_owner_uid(0, NULL) >= 0)
1146 return sd_bus_open_user(ret);
1147 else
1148 return sd_bus_open_system(ret);
1149 }
1150
1151 r = sd_bus_new(&b);
1152 if (r < 0)
1153 return r;
1154
1155 r = sd_bus_set_address(b, e);
1156 if (r < 0)
1157 goto fail;
1158
1159 b->bus_client = true;
1160
1161 /* We don't know whether the bus is trusted or not, so better
1162 * be safe, and authenticate everything */
1163 b->trusted = false;
1164 b->attach_flags |= KDBUS_ATTACH_CAPS | KDBUS_ATTACH_CREDS;
1165 b->creds_mask |= SD_BUS_CREDS_UID | SD_BUS_CREDS_EUID | SD_BUS_CREDS_EFFECTIVE_CAPS;
1166
1167 r = sd_bus_start(b);
1168 if (r < 0)
1169 goto fail;
1170
1171 *ret = b;
1172 return 0;
1173
1174 fail:
1175 bus_free(b);
1176 return r;
1177 }
1178
1179 int bus_set_address_system(sd_bus *b) {
1180 const char *e;
1181 assert(b);
1182
1183 e = secure_getenv("DBUS_SYSTEM_BUS_ADDRESS");
1184 if (e)
1185 return sd_bus_set_address(b, e);
1186
1187 return sd_bus_set_address(b, DEFAULT_SYSTEM_BUS_ADDRESS);
1188 }
1189
1190 _public_ int sd_bus_open_system(sd_bus **ret) {
1191 sd_bus *b;
1192 int r;
1193
1194 assert_return(ret, -EINVAL);
1195
1196 r = sd_bus_new(&b);
1197 if (r < 0)
1198 return r;
1199
1200 r = bus_set_address_system(b);
1201 if (r < 0)
1202 goto fail;
1203
1204 b->bus_client = true;
1205 b->is_system = true;
1206
1207 /* Let's do per-method access control on the system bus. We
1208 * need the caller's UID and capability set for that. */
1209 b->trusted = false;
1210 b->attach_flags |= KDBUS_ATTACH_CAPS | KDBUS_ATTACH_CREDS;
1211 b->creds_mask |= SD_BUS_CREDS_UID | SD_BUS_CREDS_EUID | SD_BUS_CREDS_EFFECTIVE_CAPS;
1212
1213 r = sd_bus_start(b);
1214 if (r < 0)
1215 goto fail;
1216
1217 *ret = b;
1218 return 0;
1219
1220 fail:
1221 bus_free(b);
1222 return r;
1223 }
1224
1225 int bus_set_address_user(sd_bus *b) {
1226 const char *e;
1227
1228 assert(b);
1229
1230 e = secure_getenv("DBUS_SESSION_BUS_ADDRESS");
1231 if (e)
1232 return sd_bus_set_address(b, e);
1233
1234 e = secure_getenv("XDG_RUNTIME_DIR");
1235 if (e) {
1236 _cleanup_free_ char *ee = NULL;
1237
1238 ee = bus_address_escape(e);
1239 if (!ee)
1240 return -ENOMEM;
1241
1242 (void) asprintf(&b->address, KERNEL_USER_BUS_ADDRESS_FMT ";" UNIX_USER_BUS_ADDRESS_FMT, getuid(), ee);
1243 } else
1244 (void) asprintf(&b->address, KERNEL_USER_BUS_ADDRESS_FMT, getuid());
1245
1246 if (!b->address)
1247 return -ENOMEM;
1248
1249 return 0;
1250 }
1251
1252 _public_ int sd_bus_open_user(sd_bus **ret) {
1253 sd_bus *b;
1254 int r;
1255
1256 assert_return(ret, -EINVAL);
1257
1258 r = sd_bus_new(&b);
1259 if (r < 0)
1260 return r;
1261
1262 r = bus_set_address_user(b);
1263 if (r < 0)
1264 return r;
1265
1266 b->bus_client = true;
1267 b->is_user = true;
1268
1269 /* We don't do any per-method access control on the user
1270 * bus. */
1271 b->trusted = true;
1272
1273 r = sd_bus_start(b);
1274 if (r < 0)
1275 goto fail;
1276
1277 *ret = b;
1278 return 0;
1279
1280 fail:
1281 bus_free(b);
1282 return r;
1283 }
1284
1285 int bus_set_address_system_remote(sd_bus *b, const char *host) {
1286 _cleanup_free_ char *e = NULL;
1287 char *m = NULL, *c = NULL;
1288
1289 assert(b);
1290 assert(host);
1291
1292 /* Let's see if we shall enter some container */
1293 m = strchr(host, ':');
1294 if (m) {
1295 m++;
1296
1297 /* Let's make sure this is not a port of some kind,
1298 * and is a valid machine name. */
1299 if (!in_charset(m, "0123456789") && machine_name_is_valid(m)) {
1300 char *t;
1301
1302 /* Cut out the host part */
1303 t = strndupa(host, m - host - 1);
1304 e = bus_address_escape(t);
1305 if (!e)
1306 return -ENOMEM;
1307
1308 c = strjoina(",argv4=--machine=", m);
1309 }
1310 }
1311
1312 if (!e) {
1313 e = bus_address_escape(host);
1314 if (!e)
1315 return -ENOMEM;
1316 }
1317
1318 b->address = strjoin("unixexec:path=ssh,argv1=-xT,argv2=", e, ",argv3=systemd-stdio-bridge", c, NULL);
1319 if (!b->address)
1320 return -ENOMEM;
1321
1322 return 0;
1323 }
1324
1325 _public_ int sd_bus_open_system_remote(sd_bus **ret, const char *host) {
1326 sd_bus *bus;
1327 int r;
1328
1329 assert_return(host, -EINVAL);
1330 assert_return(ret, -EINVAL);
1331
1332 r = sd_bus_new(&bus);
1333 if (r < 0)
1334 return r;
1335
1336 r = bus_set_address_system_remote(bus, host);
1337 if (r < 0)
1338 goto fail;
1339
1340 bus->bus_client = true;
1341 bus->trusted = false;
1342 bus->is_system = true;
1343
1344 r = sd_bus_start(bus);
1345 if (r < 0)
1346 goto fail;
1347
1348 *ret = bus;
1349 return 0;
1350
1351 fail:
1352 bus_free(bus);
1353 return r;
1354 }
1355
1356 int bus_set_address_system_machine(sd_bus *b, const char *machine) {
1357 _cleanup_free_ char *e = NULL;
1358
1359 assert(b);
1360 assert(machine);
1361
1362 e = bus_address_escape(machine);
1363 if (!e)
1364 return -ENOMEM;
1365
1366 b->address = strjoin("x-machine-kernel:machine=", e, ";x-machine-unix:machine=", e, NULL);
1367 if (!b->address)
1368 return -ENOMEM;
1369
1370 return 0;
1371 }
1372
1373 _public_ int sd_bus_open_system_machine(sd_bus **ret, const char *machine) {
1374 sd_bus *bus;
1375 int r;
1376
1377 assert_return(machine, -EINVAL);
1378 assert_return(ret, -EINVAL);
1379 assert_return(machine_name_is_valid(machine), -EINVAL);
1380
1381 r = sd_bus_new(&bus);
1382 if (r < 0)
1383 return r;
1384
1385 r = bus_set_address_system_machine(bus, machine);
1386 if (r < 0)
1387 goto fail;
1388
1389 bus->bus_client = true;
1390 bus->trusted = false;
1391 bus->is_system = true;
1392
1393 r = sd_bus_start(bus);
1394 if (r < 0)
1395 goto fail;
1396
1397 *ret = bus;
1398 return 0;
1399
1400 fail:
1401 bus_free(bus);
1402 return r;
1403 }
1404
1405 _public_ void sd_bus_close(sd_bus *bus) {
1406
1407 if (!bus)
1408 return;
1409 if (bus->state == BUS_CLOSED)
1410 return;
1411 if (bus_pid_changed(bus))
1412 return;
1413
1414 bus->state = BUS_CLOSED;
1415
1416 sd_bus_detach_event(bus);
1417
1418 /* Drop all queued messages so that they drop references to
1419 * the bus object and the bus may be freed */
1420 bus_reset_queues(bus);
1421
1422 if (!bus->is_kernel)
1423 bus_close_fds(bus);
1424
1425 /* We'll leave the fd open in case this is a kernel bus, since
1426 * there might still be memblocks around that reference this
1427 * bus, and they might need to invoke the KDBUS_CMD_FREE
1428 * ioctl on the fd when they are freed. */
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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