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Merge pull request #9165 from ssahani/networkd-netdevsim
[thirdparty/systemd.git] / src / shared / bus-util.c
1 /* SPDX-License-Identifier: LGPL-2.1+ */
2 /***
3 This file is part of systemd.
4
5 Copyright 2013 Lennart Poettering
6 ***/
7
8 #include <errno.h>
9 #include <fcntl.h>
10 #include <inttypes.h>
11 #include <stdio.h>
12 #include <stdlib.h>
13 #include <string.h>
14 #include <sys/ioctl.h>
15 #include <sys/resource.h>
16 #include <sys/socket.h>
17 #include <unistd.h>
18
19 #include "sd-bus-protocol.h"
20 #include "sd-bus.h"
21 #include "sd-daemon.h"
22 #include "sd-event.h"
23 #include "sd-id128.h"
24
25 #include "alloc-util.h"
26 #include "bus-internal.h"
27 #include "bus-label.h"
28 #include "bus-message.h"
29 #include "bus-util.h"
30 #include "cap-list.h"
31 #include "cgroup-util.h"
32 #include "def.h"
33 #include "escape.h"
34 #include "fd-util.h"
35 #include "missing.h"
36 #include "mount-util.h"
37 #include "nsflags.h"
38 #include "parse-util.h"
39 #include "proc-cmdline.h"
40 #include "rlimit-util.h"
41 #include "stdio-util.h"
42 #include "strv.h"
43 #include "user-util.h"
44
45 static int name_owner_change_callback(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
46 sd_event *e = userdata;
47
48 assert(m);
49 assert(e);
50
51 sd_bus_close(sd_bus_message_get_bus(m));
52 sd_event_exit(e, 0);
53
54 return 1;
55 }
56
57 int bus_async_unregister_and_exit(sd_event *e, sd_bus *bus, const char *name) {
58 const char *match;
59 const char *unique;
60 int r;
61
62 assert(e);
63 assert(bus);
64 assert(name);
65
66 /* We unregister the name here and then wait for the
67 * NameOwnerChanged signal for this event to arrive before we
68 * quit. We do this in order to make sure that any queued
69 * requests are still processed before we really exit. */
70
71 r = sd_bus_get_unique_name(bus, &unique);
72 if (r < 0)
73 return r;
74
75 match = strjoina(
76 "sender='org.freedesktop.DBus',"
77 "type='signal',"
78 "interface='org.freedesktop.DBus',"
79 "member='NameOwnerChanged',"
80 "path='/org/freedesktop/DBus',"
81 "arg0='", name, "',",
82 "arg1='", unique, "',",
83 "arg2=''");
84
85 r = sd_bus_add_match_async(bus, NULL, match, name_owner_change_callback, NULL, e);
86 if (r < 0)
87 return r;
88
89 r = sd_bus_release_name_async(bus, NULL, name, NULL, NULL);
90 if (r < 0)
91 return r;
92
93 return 0;
94 }
95
96 int bus_event_loop_with_idle(
97 sd_event *e,
98 sd_bus *bus,
99 const char *name,
100 usec_t timeout,
101 check_idle_t check_idle,
102 void *userdata) {
103 bool exiting = false;
104 int r, code;
105
106 assert(e);
107 assert(bus);
108 assert(name);
109
110 for (;;) {
111 bool idle;
112
113 r = sd_event_get_state(e);
114 if (r < 0)
115 return r;
116 if (r == SD_EVENT_FINISHED)
117 break;
118
119 if (check_idle)
120 idle = check_idle(userdata);
121 else
122 idle = true;
123
124 r = sd_event_run(e, exiting || !idle ? (uint64_t) -1 : timeout);
125 if (r < 0)
126 return r;
127
128 if (r == 0 && !exiting && idle) {
129
130 r = sd_bus_try_close(bus);
131 if (r == -EBUSY)
132 continue;
133
134 /* Fallback for dbus1 connections: we
135 * unregister the name and wait for the
136 * response to come through for it */
137 if (r == -EOPNOTSUPP) {
138
139 /* Inform the service manager that we
140 * are going down, so that it will
141 * queue all further start requests,
142 * instead of assuming we are already
143 * running. */
144 sd_notify(false, "STOPPING=1");
145
146 r = bus_async_unregister_and_exit(e, bus, name);
147 if (r < 0)
148 return r;
149
150 exiting = true;
151 continue;
152 }
153
154 if (r < 0)
155 return r;
156
157 sd_event_exit(e, 0);
158 break;
159 }
160 }
161
162 r = sd_event_get_exit_code(e, &code);
163 if (r < 0)
164 return r;
165
166 return code;
167 }
168
169 int bus_name_has_owner(sd_bus *c, const char *name, sd_bus_error *error) {
170 _cleanup_(sd_bus_message_unrefp) sd_bus_message *rep = NULL;
171 int r, has_owner = 0;
172
173 assert(c);
174 assert(name);
175
176 r = sd_bus_call_method(c,
177 "org.freedesktop.DBus",
178 "/org/freedesktop/dbus",
179 "org.freedesktop.DBus",
180 "NameHasOwner",
181 error,
182 &rep,
183 "s",
184 name);
185 if (r < 0)
186 return r;
187
188 r = sd_bus_message_read_basic(rep, 'b', &has_owner);
189 if (r < 0)
190 return sd_bus_error_set_errno(error, r);
191
192 return has_owner;
193 }
194
195 static int check_good_user(sd_bus_message *m, uid_t good_user) {
196 _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
197 uid_t sender_uid;
198 int r;
199
200 assert(m);
201
202 if (good_user == UID_INVALID)
203 return 0;
204
205 r = sd_bus_query_sender_creds(m, SD_BUS_CREDS_EUID, &creds);
206 if (r < 0)
207 return r;
208
209 /* Don't trust augmented credentials for authorization */
210 assert_return((sd_bus_creds_get_augmented_mask(creds) & SD_BUS_CREDS_EUID) == 0, -EPERM);
211
212 r = sd_bus_creds_get_euid(creds, &sender_uid);
213 if (r < 0)
214 return r;
215
216 return sender_uid == good_user;
217 }
218
219 int bus_test_polkit(
220 sd_bus_message *call,
221 int capability,
222 const char *action,
223 const char **details,
224 uid_t good_user,
225 bool *_challenge,
226 sd_bus_error *e) {
227
228 int r;
229
230 assert(call);
231 assert(action);
232
233 /* Tests non-interactively! */
234
235 r = check_good_user(call, good_user);
236 if (r != 0)
237 return r;
238
239 r = sd_bus_query_sender_privilege(call, capability);
240 if (r < 0)
241 return r;
242 else if (r > 0)
243 return 1;
244 #if ENABLE_POLKIT
245 else {
246 _cleanup_(sd_bus_message_unrefp) sd_bus_message *request = NULL;
247 _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
248 int authorized = false, challenge = false;
249 const char *sender, **k, **v;
250
251 sender = sd_bus_message_get_sender(call);
252 if (!sender)
253 return -EBADMSG;
254
255 r = sd_bus_message_new_method_call(
256 call->bus,
257 &request,
258 "org.freedesktop.PolicyKit1",
259 "/org/freedesktop/PolicyKit1/Authority",
260 "org.freedesktop.PolicyKit1.Authority",
261 "CheckAuthorization");
262 if (r < 0)
263 return r;
264
265 r = sd_bus_message_append(
266 request,
267 "(sa{sv})s",
268 "system-bus-name", 1, "name", "s", sender,
269 action);
270 if (r < 0)
271 return r;
272
273 r = sd_bus_message_open_container(request, 'a', "{ss}");
274 if (r < 0)
275 return r;
276
277 STRV_FOREACH_PAIR(k, v, details) {
278 r = sd_bus_message_append(request, "{ss}", *k, *v);
279 if (r < 0)
280 return r;
281 }
282
283 r = sd_bus_message_close_container(request);
284 if (r < 0)
285 return r;
286
287 r = sd_bus_message_append(request, "us", 0, NULL);
288 if (r < 0)
289 return r;
290
291 r = sd_bus_call(call->bus, request, 0, e, &reply);
292 if (r < 0) {
293 /* Treat no PK available as access denied */
294 if (sd_bus_error_has_name(e, SD_BUS_ERROR_SERVICE_UNKNOWN)) {
295 sd_bus_error_free(e);
296 return -EACCES;
297 }
298
299 return r;
300 }
301
302 r = sd_bus_message_enter_container(reply, 'r', "bba{ss}");
303 if (r < 0)
304 return r;
305
306 r = sd_bus_message_read(reply, "bb", &authorized, &challenge);
307 if (r < 0)
308 return r;
309
310 if (authorized)
311 return 1;
312
313 if (_challenge) {
314 *_challenge = challenge;
315 return 0;
316 }
317 }
318 #endif
319
320 return -EACCES;
321 }
322
323 #if ENABLE_POLKIT
324
325 typedef struct AsyncPolkitQuery {
326 sd_bus_message *request, *reply;
327 sd_bus_message_handler_t callback;
328 void *userdata;
329 sd_bus_slot *slot;
330 Hashmap *registry;
331 } AsyncPolkitQuery;
332
333 static void async_polkit_query_free(AsyncPolkitQuery *q) {
334
335 if (!q)
336 return;
337
338 sd_bus_slot_unref(q->slot);
339
340 if (q->registry && q->request)
341 hashmap_remove(q->registry, q->request);
342
343 sd_bus_message_unref(q->request);
344 sd_bus_message_unref(q->reply);
345
346 free(q);
347 }
348
349 static int async_polkit_callback(sd_bus_message *reply, void *userdata, sd_bus_error *error) {
350 _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
351 AsyncPolkitQuery *q = userdata;
352 int r;
353
354 assert(reply);
355 assert(q);
356
357 q->slot = sd_bus_slot_unref(q->slot);
358 q->reply = sd_bus_message_ref(reply);
359
360 r = sd_bus_message_rewind(q->request, true);
361 if (r < 0) {
362 r = sd_bus_reply_method_errno(q->request, r, NULL);
363 goto finish;
364 }
365
366 r = q->callback(q->request, q->userdata, &error_buffer);
367 r = bus_maybe_reply_error(q->request, r, &error_buffer);
368
369 finish:
370 async_polkit_query_free(q);
371
372 return r;
373 }
374
375 #endif
376
377 int bus_verify_polkit_async(
378 sd_bus_message *call,
379 int capability,
380 const char *action,
381 const char **details,
382 bool interactive,
383 uid_t good_user,
384 Hashmap **registry,
385 sd_bus_error *error) {
386
387 #if ENABLE_POLKIT
388 _cleanup_(sd_bus_message_unrefp) sd_bus_message *pk = NULL;
389 AsyncPolkitQuery *q;
390 const char *sender, **k, **v;
391 sd_bus_message_handler_t callback;
392 void *userdata;
393 int c;
394 #endif
395 int r;
396
397 assert(call);
398 assert(action);
399 assert(registry);
400
401 r = check_good_user(call, good_user);
402 if (r != 0)
403 return r;
404
405 #if ENABLE_POLKIT
406 q = hashmap_get(*registry, call);
407 if (q) {
408 int authorized, challenge;
409
410 /* This is the second invocation of this function, and
411 * there's already a response from polkit, let's
412 * process it */
413 assert(q->reply);
414
415 if (sd_bus_message_is_method_error(q->reply, NULL)) {
416 const sd_bus_error *e;
417
418 /* Copy error from polkit reply */
419 e = sd_bus_message_get_error(q->reply);
420 sd_bus_error_copy(error, e);
421
422 /* Treat no PK available as access denied */
423 if (sd_bus_error_has_name(e, SD_BUS_ERROR_SERVICE_UNKNOWN))
424 return -EACCES;
425
426 return -sd_bus_error_get_errno(e);
427 }
428
429 r = sd_bus_message_enter_container(q->reply, 'r', "bba{ss}");
430 if (r >= 0)
431 r = sd_bus_message_read(q->reply, "bb", &authorized, &challenge);
432
433 if (r < 0)
434 return r;
435
436 if (authorized)
437 return 1;
438
439 if (challenge)
440 return sd_bus_error_set(error, SD_BUS_ERROR_INTERACTIVE_AUTHORIZATION_REQUIRED, "Interactive authentication required.");
441
442 return -EACCES;
443 }
444 #endif
445
446 r = sd_bus_query_sender_privilege(call, capability);
447 if (r < 0)
448 return r;
449 else if (r > 0)
450 return 1;
451
452 #if ENABLE_POLKIT
453 if (sd_bus_get_current_message(call->bus) != call)
454 return -EINVAL;
455
456 callback = sd_bus_get_current_handler(call->bus);
457 if (!callback)
458 return -EINVAL;
459
460 userdata = sd_bus_get_current_userdata(call->bus);
461
462 sender = sd_bus_message_get_sender(call);
463 if (!sender)
464 return -EBADMSG;
465
466 c = sd_bus_message_get_allow_interactive_authorization(call);
467 if (c < 0)
468 return c;
469 if (c > 0)
470 interactive = true;
471
472 r = hashmap_ensure_allocated(registry, NULL);
473 if (r < 0)
474 return r;
475
476 r = sd_bus_message_new_method_call(
477 call->bus,
478 &pk,
479 "org.freedesktop.PolicyKit1",
480 "/org/freedesktop/PolicyKit1/Authority",
481 "org.freedesktop.PolicyKit1.Authority",
482 "CheckAuthorization");
483 if (r < 0)
484 return r;
485
486 r = sd_bus_message_append(
487 pk,
488 "(sa{sv})s",
489 "system-bus-name", 1, "name", "s", sender,
490 action);
491 if (r < 0)
492 return r;
493
494 r = sd_bus_message_open_container(pk, 'a', "{ss}");
495 if (r < 0)
496 return r;
497
498 STRV_FOREACH_PAIR(k, v, details) {
499 r = sd_bus_message_append(pk, "{ss}", *k, *v);
500 if (r < 0)
501 return r;
502 }
503
504 r = sd_bus_message_close_container(pk);
505 if (r < 0)
506 return r;
507
508 r = sd_bus_message_append(pk, "us", !!interactive, NULL);
509 if (r < 0)
510 return r;
511
512 q = new0(AsyncPolkitQuery, 1);
513 if (!q)
514 return -ENOMEM;
515
516 q->request = sd_bus_message_ref(call);
517 q->callback = callback;
518 q->userdata = userdata;
519
520 r = hashmap_put(*registry, call, q);
521 if (r < 0) {
522 async_polkit_query_free(q);
523 return r;
524 }
525
526 q->registry = *registry;
527
528 r = sd_bus_call_async(call->bus, &q->slot, pk, async_polkit_callback, q, 0);
529 if (r < 0) {
530 async_polkit_query_free(q);
531 return r;
532 }
533
534 return 0;
535 #endif
536
537 return -EACCES;
538 }
539
540 void bus_verify_polkit_async_registry_free(Hashmap *registry) {
541 #if ENABLE_POLKIT
542 hashmap_free_with_destructor(registry, async_polkit_query_free);
543 #endif
544 }
545
546 int bus_check_peercred(sd_bus *c) {
547 struct ucred ucred;
548 int fd, r;
549
550 assert(c);
551
552 fd = sd_bus_get_fd(c);
553 if (fd < 0)
554 return fd;
555
556 r = getpeercred(fd, &ucred);
557 if (r < 0)
558 return r;
559
560 if (ucred.uid != 0 && ucred.uid != geteuid())
561 return -EPERM;
562
563 return 1;
564 }
565
566 int bus_connect_system_systemd(sd_bus **_bus) {
567 _cleanup_(sd_bus_unrefp) sd_bus *bus = NULL;
568 int r;
569
570 assert(_bus);
571
572 if (geteuid() != 0)
573 return sd_bus_default_system(_bus);
574
575 /* If we are root then let's talk directly to the system
576 * instance, instead of going via the bus */
577
578 r = sd_bus_new(&bus);
579 if (r < 0)
580 return r;
581
582 r = sd_bus_set_address(bus, "unix:path=/run/systemd/private");
583 if (r < 0)
584 return r;
585
586 r = sd_bus_start(bus);
587 if (r < 0)
588 return sd_bus_default_system(_bus);
589
590 r = bus_check_peercred(bus);
591 if (r < 0)
592 return r;
593
594 *_bus = TAKE_PTR(bus);
595
596 return 0;
597 }
598
599 int bus_connect_user_systemd(sd_bus **_bus) {
600 _cleanup_(sd_bus_unrefp) sd_bus *bus = NULL;
601 _cleanup_free_ char *ee = NULL;
602 const char *e;
603 int r;
604
605 assert(_bus);
606
607 e = secure_getenv("XDG_RUNTIME_DIR");
608 if (!e)
609 return sd_bus_default_user(_bus);
610
611 ee = bus_address_escape(e);
612 if (!ee)
613 return -ENOMEM;
614
615 r = sd_bus_new(&bus);
616 if (r < 0)
617 return r;
618
619 bus->address = strjoin("unix:path=", ee, "/systemd/private");
620 if (!bus->address)
621 return -ENOMEM;
622
623 r = sd_bus_start(bus);
624 if (r < 0)
625 return sd_bus_default_user(_bus);
626
627 r = bus_check_peercred(bus);
628 if (r < 0)
629 return r;
630
631 *_bus = TAKE_PTR(bus);
632
633 return 0;
634 }
635
636 #define print_property(name, fmt, ...) \
637 do { \
638 if (value) \
639 printf(fmt "\n", __VA_ARGS__); \
640 else \
641 printf("%s=" fmt "\n", name, __VA_ARGS__); \
642 } while (0)
643
644 int bus_print_property(const char *name, sd_bus_message *m, bool value, bool all) {
645 char type;
646 const char *contents;
647 int r;
648
649 assert(name);
650 assert(m);
651
652 r = sd_bus_message_peek_type(m, &type, &contents);
653 if (r < 0)
654 return r;
655
656 switch (type) {
657
658 case SD_BUS_TYPE_STRING: {
659 const char *s;
660
661 r = sd_bus_message_read_basic(m, type, &s);
662 if (r < 0)
663 return r;
664
665 if (all || !isempty(s)) {
666 bool good;
667
668 /* This property has a single value, so we need to take
669 * care not to print a new line, everything else is OK. */
670 good = !strchr(s, '\n');
671 print_property(name, "%s", good ? s : "[unprintable]");
672 }
673
674 return 1;
675 }
676
677 case SD_BUS_TYPE_BOOLEAN: {
678 int b;
679
680 r = sd_bus_message_read_basic(m, type, &b);
681 if (r < 0)
682 return r;
683
684 print_property(name, "%s", yes_no(b));
685
686 return 1;
687 }
688
689 case SD_BUS_TYPE_UINT64: {
690 uint64_t u;
691
692 r = sd_bus_message_read_basic(m, type, &u);
693 if (r < 0)
694 return r;
695
696 /* Yes, heuristics! But we can change this check
697 * should it turn out to not be sufficient */
698
699 if (endswith(name, "Timestamp") || STR_IN_SET(name, "NextElapseUSecRealtime", "LastTriggerUSec")) {
700 char timestamp[FORMAT_TIMESTAMP_MAX];
701 const char *t;
702
703 t = format_timestamp(timestamp, sizeof(timestamp), u);
704 if (t || all)
705 print_property(name, "%s", strempty(t));
706
707 } else if (strstr(name, "USec")) {
708 char timespan[FORMAT_TIMESPAN_MAX];
709
710 print_property(name, "%s", format_timespan(timespan, sizeof(timespan), u, 0));
711 } else if (streq(name, "RestrictNamespaces")) {
712 _cleanup_free_ char *s = NULL;
713 const char *result;
714
715 if ((u & NAMESPACE_FLAGS_ALL) == 0)
716 result = "yes";
717 else if ((u & NAMESPACE_FLAGS_ALL) == NAMESPACE_FLAGS_ALL)
718 result = "no";
719 else {
720 r = namespace_flags_to_string(u, &s);
721 if (r < 0)
722 return r;
723
724 result = s;
725 }
726
727 print_property(name, "%s", result);
728
729 } else if (streq(name, "MountFlags")) {
730 const char *result;
731
732 result = mount_propagation_flags_to_string(u);
733 if (!result)
734 return -EINVAL;
735
736 print_property(name, "%s", result);
737
738 } else if (STR_IN_SET(name, "CapabilityBoundingSet", "AmbientCapabilities")) {
739 _cleanup_free_ char *s = NULL;
740
741 r = capability_set_to_string_alloc(u, &s);
742 if (r < 0)
743 return r;
744
745 print_property(name, "%s", s);
746
747 } else if ((STR_IN_SET(name, "CPUWeight", "StartupCPUWeight", "IOWeight", "StartupIOWeight") && u == CGROUP_WEIGHT_INVALID) ||
748 (STR_IN_SET(name, "CPUShares", "StartupCPUShares") && u == CGROUP_CPU_SHARES_INVALID) ||
749 (STR_IN_SET(name, "BlockIOWeight", "StartupBlockIOWeight") && u == CGROUP_BLKIO_WEIGHT_INVALID) ||
750 (STR_IN_SET(name, "MemoryCurrent", "TasksCurrent") && u == (uint64_t) -1) ||
751 (endswith(name, "NSec") && u == (uint64_t) -1))
752
753 print_property(name, "%s", "[not set]");
754
755 else if ((STR_IN_SET(name, "MemoryLow", "MemoryHigh", "MemoryMax", "MemorySwapMax", "MemoryLimit") && u == CGROUP_LIMIT_MAX) ||
756 (STR_IN_SET(name, "TasksMax", "DefaultTasksMax") && u == (uint64_t) -1) ||
757 (startswith(name, "Limit") && u == (uint64_t) -1) ||
758 (startswith(name, "DefaultLimit") && u == (uint64_t) -1))
759
760 print_property(name, "%s", "infinity");
761 else
762 print_property(name, "%"PRIu64, u);
763
764 return 1;
765 }
766
767 case SD_BUS_TYPE_INT64: {
768 int64_t i;
769
770 r = sd_bus_message_read_basic(m, type, &i);
771 if (r < 0)
772 return r;
773
774 print_property(name, "%"PRIi64, i);
775
776 return 1;
777 }
778
779 case SD_BUS_TYPE_UINT32: {
780 uint32_t u;
781
782 r = sd_bus_message_read_basic(m, type, &u);
783 if (r < 0)
784 return r;
785
786 if (strstr(name, "UMask") || strstr(name, "Mode"))
787 print_property(name, "%04o", u);
788 else if (streq(name, "UID")) {
789 if (u == UID_INVALID)
790 print_property(name, "%s", "[not set]");
791 else
792 print_property(name, "%"PRIu32, u);
793 } else if (streq(name, "GID")) {
794 if (u == GID_INVALID)
795 print_property(name, "%s", "[not set]");
796 else
797 print_property(name, "%"PRIu32, u);
798 } else
799 print_property(name, "%"PRIu32, u);
800
801 return 1;
802 }
803
804 case SD_BUS_TYPE_INT32: {
805 int32_t i;
806
807 r = sd_bus_message_read_basic(m, type, &i);
808 if (r < 0)
809 return r;
810
811 print_property(name, "%"PRIi32, i);
812 return 1;
813 }
814
815 case SD_BUS_TYPE_DOUBLE: {
816 double d;
817
818 r = sd_bus_message_read_basic(m, type, &d);
819 if (r < 0)
820 return r;
821
822 print_property(name, "%g", d);
823 return 1;
824 }
825
826 case SD_BUS_TYPE_ARRAY:
827 if (streq(contents, "s")) {
828 bool first = true;
829 const char *str;
830
831 r = sd_bus_message_enter_container(m, SD_BUS_TYPE_ARRAY, contents);
832 if (r < 0)
833 return r;
834
835 while ((r = sd_bus_message_read_basic(m, SD_BUS_TYPE_STRING, &str)) > 0) {
836 bool good;
837
838 if (first && !value)
839 printf("%s=", name);
840
841 /* This property has multiple space-separated values, so
842 * neither spaces nor newlines can be allowed in a value. */
843 good = str[strcspn(str, " \n")] == '\0';
844
845 printf("%s%s", first ? "" : " ", good ? str : "[unprintable]");
846
847 first = false;
848 }
849 if (r < 0)
850 return r;
851
852 if (first && all && !value)
853 printf("%s=", name);
854 if (!first || all)
855 puts("");
856
857 r = sd_bus_message_exit_container(m);
858 if (r < 0)
859 return r;
860
861 return 1;
862
863 } else if (streq(contents, "y")) {
864 const uint8_t *u;
865 size_t n;
866
867 r = sd_bus_message_read_array(m, SD_BUS_TYPE_BYTE, (const void**) &u, &n);
868 if (r < 0)
869 return r;
870
871 if (all || n > 0) {
872 unsigned int i;
873
874 if (!value)
875 printf("%s=", name);
876
877 for (i = 0; i < n; i++)
878 printf("%02x", u[i]);
879
880 puts("");
881 }
882
883 return 1;
884
885 } else if (streq(contents, "u")) {
886 uint32_t *u;
887 size_t n;
888
889 r = sd_bus_message_read_array(m, SD_BUS_TYPE_UINT32, (const void**) &u, &n);
890 if (r < 0)
891 return r;
892
893 if (all || n > 0) {
894 unsigned int i;
895
896 if (!value)
897 printf("%s=", name);
898
899 for (i = 0; i < n; i++)
900 printf("%08x", u[i]);
901
902 puts("");
903 }
904
905 return 1;
906 }
907
908 break;
909 }
910
911 return 0;
912 }
913
914 int bus_message_print_all_properties(
915 sd_bus_message *m,
916 bus_message_print_t func,
917 char **filter,
918 bool value,
919 bool all,
920 Set **found_properties) {
921
922 int r;
923
924 assert(m);
925
926 r = sd_bus_message_enter_container(m, SD_BUS_TYPE_ARRAY, "{sv}");
927 if (r < 0)
928 return r;
929
930 while ((r = sd_bus_message_enter_container(m, SD_BUS_TYPE_DICT_ENTRY, "sv")) > 0) {
931 const char *name;
932 const char *contents;
933
934 r = sd_bus_message_read_basic(m, SD_BUS_TYPE_STRING, &name);
935 if (r < 0)
936 return r;
937
938 if (found_properties) {
939 r = set_ensure_allocated(found_properties, &string_hash_ops);
940 if (r < 0)
941 return log_oom();
942
943 r = set_put(*found_properties, name);
944 if (r < 0 && r != EEXIST)
945 return log_oom();
946 }
947
948 if (!filter || strv_find(filter, name)) {
949 r = sd_bus_message_peek_type(m, NULL, &contents);
950 if (r < 0)
951 return r;
952
953 r = sd_bus_message_enter_container(m, SD_BUS_TYPE_VARIANT, contents);
954 if (r < 0)
955 return r;
956
957 if (func)
958 r = func(name, m, value, all);
959 if (!func || r == 0)
960 r = bus_print_property(name, m, value, all);
961 if (r < 0)
962 return r;
963 if (r == 0) {
964 if (all)
965 printf("%s=[unprintable]\n", name);
966 /* skip what we didn't read */
967 r = sd_bus_message_skip(m, contents);
968 if (r < 0)
969 return r;
970 }
971
972 r = sd_bus_message_exit_container(m);
973 if (r < 0)
974 return r;
975 } else {
976 r = sd_bus_message_skip(m, "v");
977 if (r < 0)
978 return r;
979 }
980
981 r = sd_bus_message_exit_container(m);
982 if (r < 0)
983 return r;
984 }
985 if (r < 0)
986 return r;
987
988 r = sd_bus_message_exit_container(m);
989 if (r < 0)
990 return r;
991
992 return 0;
993 }
994
995 int bus_print_all_properties(
996 sd_bus *bus,
997 const char *dest,
998 const char *path,
999 bus_message_print_t func,
1000 char **filter,
1001 bool value,
1002 bool all,
1003 Set **found_properties) {
1004
1005 _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
1006 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
1007 int r;
1008
1009 assert(bus);
1010 assert(path);
1011
1012 r = sd_bus_call_method(bus,
1013 dest,
1014 path,
1015 "org.freedesktop.DBus.Properties",
1016 "GetAll",
1017 &error,
1018 &reply,
1019 "s", "");
1020 if (r < 0)
1021 return r;
1022
1023 return bus_message_print_all_properties(reply, func, filter, value, all, found_properties);
1024 }
1025
1026 int bus_map_id128(sd_bus *bus, const char *member, sd_bus_message *m, sd_bus_error *error, void *userdata) {
1027 sd_id128_t *p = userdata;
1028 const void *v;
1029 size_t n;
1030 int r;
1031
1032 r = sd_bus_message_read_array(m, SD_BUS_TYPE_BYTE, &v, &n);
1033 if (r < 0)
1034 return r;
1035
1036 if (n == 0)
1037 *p = SD_ID128_NULL;
1038 else if (n == 16)
1039 memcpy((*p).bytes, v, n);
1040 else
1041 return -EINVAL;
1042
1043 return 0;
1044 }
1045
1046 static int map_basic(sd_bus *bus, const char *member, sd_bus_message *m, unsigned flags, sd_bus_error *error, void *userdata) {
1047 char type;
1048 int r;
1049
1050 r = sd_bus_message_peek_type(m, &type, NULL);
1051 if (r < 0)
1052 return r;
1053
1054 switch (type) {
1055
1056 case SD_BUS_TYPE_STRING: {
1057 const char **p = userdata;
1058 const char *s;
1059
1060 r = sd_bus_message_read_basic(m, type, &s);
1061 if (r < 0)
1062 return r;
1063
1064 if (isempty(s))
1065 s = NULL;
1066
1067 if (flags & BUS_MAP_STRDUP)
1068 return free_and_strdup((char **) userdata, s);
1069
1070 *p = s;
1071 return 0;
1072 }
1073
1074 case SD_BUS_TYPE_ARRAY: {
1075 _cleanup_strv_free_ char **l = NULL;
1076 char ***p = userdata;
1077
1078 r = bus_message_read_strv_extend(m, &l);
1079 if (r < 0)
1080 return r;
1081
1082 return strv_free_and_replace(*p, l);
1083 }
1084
1085 case SD_BUS_TYPE_BOOLEAN: {
1086 int b;
1087
1088 r = sd_bus_message_read_basic(m, type, &b);
1089 if (r < 0)
1090 return r;
1091
1092 if (flags & BUS_MAP_BOOLEAN_AS_BOOL)
1093 * (bool*) userdata = !!b;
1094 else
1095 * (int*) userdata = b;
1096
1097 return 0;
1098 }
1099
1100 case SD_BUS_TYPE_INT32:
1101 case SD_BUS_TYPE_UINT32: {
1102 uint32_t u, *p = userdata;
1103
1104 r = sd_bus_message_read_basic(m, type, &u);
1105 if (r < 0)
1106 return r;
1107
1108 *p = u;
1109 return 0;
1110 }
1111
1112 case SD_BUS_TYPE_INT64:
1113 case SD_BUS_TYPE_UINT64: {
1114 uint64_t t, *p = userdata;
1115
1116 r = sd_bus_message_read_basic(m, type, &t);
1117 if (r < 0)
1118 return r;
1119
1120 *p = t;
1121 return 0;
1122 }
1123
1124 case SD_BUS_TYPE_DOUBLE: {
1125 double d, *p = userdata;
1126
1127 r = sd_bus_message_read_basic(m, type, &d);
1128 if (r < 0)
1129 return r;
1130
1131 *p = d;
1132 return 0;
1133 }}
1134
1135 return -EOPNOTSUPP;
1136 }
1137
1138 int bus_message_map_all_properties(
1139 sd_bus_message *m,
1140 const struct bus_properties_map *map,
1141 unsigned flags,
1142 sd_bus_error *error,
1143 void *userdata) {
1144
1145 int r;
1146
1147 assert(m);
1148 assert(map);
1149
1150 r = sd_bus_message_enter_container(m, SD_BUS_TYPE_ARRAY, "{sv}");
1151 if (r < 0)
1152 return r;
1153
1154 while ((r = sd_bus_message_enter_container(m, SD_BUS_TYPE_DICT_ENTRY, "sv")) > 0) {
1155 const struct bus_properties_map *prop;
1156 const char *member;
1157 const char *contents;
1158 void *v;
1159 unsigned i;
1160
1161 r = sd_bus_message_read_basic(m, SD_BUS_TYPE_STRING, &member);
1162 if (r < 0)
1163 return r;
1164
1165 for (i = 0, prop = NULL; map[i].member; i++)
1166 if (streq(map[i].member, member)) {
1167 prop = &map[i];
1168 break;
1169 }
1170
1171 if (prop) {
1172 r = sd_bus_message_peek_type(m, NULL, &contents);
1173 if (r < 0)
1174 return r;
1175
1176 r = sd_bus_message_enter_container(m, SD_BUS_TYPE_VARIANT, contents);
1177 if (r < 0)
1178 return r;
1179
1180 v = (uint8_t *)userdata + prop->offset;
1181 if (map[i].set)
1182 r = prop->set(sd_bus_message_get_bus(m), member, m, error, v);
1183 else
1184 r = map_basic(sd_bus_message_get_bus(m), member, m, flags, error, v);
1185 if (r < 0)
1186 return r;
1187
1188 r = sd_bus_message_exit_container(m);
1189 if (r < 0)
1190 return r;
1191 } else {
1192 r = sd_bus_message_skip(m, "v");
1193 if (r < 0)
1194 return r;
1195 }
1196
1197 r = sd_bus_message_exit_container(m);
1198 if (r < 0)
1199 return r;
1200 }
1201 if (r < 0)
1202 return r;
1203
1204 return sd_bus_message_exit_container(m);
1205 }
1206
1207 int bus_message_map_properties_changed(
1208 sd_bus_message *m,
1209 const struct bus_properties_map *map,
1210 unsigned flags,
1211 sd_bus_error *error,
1212 void *userdata) {
1213
1214 const char *member;
1215 int r, invalidated, i;
1216
1217 assert(m);
1218 assert(map);
1219
1220 r = bus_message_map_all_properties(m, map, flags, error, userdata);
1221 if (r < 0)
1222 return r;
1223
1224 r = sd_bus_message_enter_container(m, SD_BUS_TYPE_ARRAY, "s");
1225 if (r < 0)
1226 return r;
1227
1228 invalidated = 0;
1229 while ((r = sd_bus_message_read_basic(m, SD_BUS_TYPE_STRING, &member)) > 0)
1230 for (i = 0; map[i].member; i++)
1231 if (streq(map[i].member, member)) {
1232 ++invalidated;
1233 break;
1234 }
1235 if (r < 0)
1236 return r;
1237
1238 r = sd_bus_message_exit_container(m);
1239 if (r < 0)
1240 return r;
1241
1242 return invalidated;
1243 }
1244
1245 int bus_map_all_properties(
1246 sd_bus *bus,
1247 const char *destination,
1248 const char *path,
1249 const struct bus_properties_map *map,
1250 unsigned flags,
1251 sd_bus_error *error,
1252 sd_bus_message **reply,
1253 void *userdata) {
1254
1255 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
1256 int r;
1257
1258 assert(bus);
1259 assert(destination);
1260 assert(path);
1261 assert(map);
1262 assert(reply || (flags & BUS_MAP_STRDUP));
1263
1264 r = sd_bus_call_method(
1265 bus,
1266 destination,
1267 path,
1268 "org.freedesktop.DBus.Properties",
1269 "GetAll",
1270 error,
1271 &m,
1272 "s", "");
1273 if (r < 0)
1274 return r;
1275
1276 r = bus_message_map_all_properties(m, map, flags, error, userdata);
1277 if (r < 0)
1278 return r;
1279
1280 if (reply)
1281 *reply = sd_bus_message_ref(m);
1282
1283 return r;
1284 }
1285
1286 int bus_connect_transport(BusTransport transport, const char *host, bool user, sd_bus **ret) {
1287 _cleanup_(sd_bus_unrefp) sd_bus *bus = NULL;
1288 int r;
1289
1290 assert(transport >= 0);
1291 assert(transport < _BUS_TRANSPORT_MAX);
1292 assert(ret);
1293
1294 assert_return((transport == BUS_TRANSPORT_LOCAL) == !host, -EINVAL);
1295 assert_return(transport == BUS_TRANSPORT_LOCAL || !user, -EOPNOTSUPP);
1296
1297 switch (transport) {
1298
1299 case BUS_TRANSPORT_LOCAL:
1300 if (user)
1301 r = sd_bus_default_user(&bus);
1302 else {
1303 if (sd_booted() <= 0) {
1304 /* Print a friendly message when the local system is actually not running systemd as PID 1. */
1305 log_error("System has not been booted with systemd as init system (PID 1). Can't operate.");
1306
1307 return -EHOSTDOWN;
1308 }
1309 r = sd_bus_default_system(&bus);
1310 }
1311 break;
1312
1313 case BUS_TRANSPORT_REMOTE:
1314 r = sd_bus_open_system_remote(&bus, host);
1315 break;
1316
1317 case BUS_TRANSPORT_MACHINE:
1318 r = sd_bus_open_system_machine(&bus, host);
1319 break;
1320
1321 default:
1322 assert_not_reached("Hmm, unknown transport type.");
1323 }
1324 if (r < 0)
1325 return r;
1326
1327 r = sd_bus_set_exit_on_disconnect(bus, true);
1328 if (r < 0)
1329 return r;
1330
1331 *ret = TAKE_PTR(bus);
1332
1333 return 0;
1334 }
1335
1336 int bus_connect_transport_systemd(BusTransport transport, const char *host, bool user, sd_bus **bus) {
1337 int r;
1338
1339 assert(transport >= 0);
1340 assert(transport < _BUS_TRANSPORT_MAX);
1341 assert(bus);
1342
1343 assert_return((transport == BUS_TRANSPORT_LOCAL) == !host, -EINVAL);
1344 assert_return(transport == BUS_TRANSPORT_LOCAL || !user, -EOPNOTSUPP);
1345
1346 switch (transport) {
1347
1348 case BUS_TRANSPORT_LOCAL:
1349 if (user)
1350 r = bus_connect_user_systemd(bus);
1351 else {
1352 if (sd_booted() <= 0) {
1353 /* Print a friendly message when the local system is actually not running systemd as PID 1. */
1354 log_error("System has not been booted with systemd as init system (PID 1). Can't operate.");
1355
1356 return -EHOSTDOWN;
1357 }
1358 r = bus_connect_system_systemd(bus);
1359 }
1360 break;
1361
1362 case BUS_TRANSPORT_REMOTE:
1363 r = sd_bus_open_system_remote(bus, host);
1364 break;
1365
1366 case BUS_TRANSPORT_MACHINE:
1367 r = sd_bus_open_system_machine(bus, host);
1368 break;
1369
1370 default:
1371 assert_not_reached("Hmm, unknown transport type.");
1372 }
1373
1374 return r;
1375 }
1376
1377 int bus_property_get_bool(
1378 sd_bus *bus,
1379 const char *path,
1380 const char *interface,
1381 const char *property,
1382 sd_bus_message *reply,
1383 void *userdata,
1384 sd_bus_error *error) {
1385
1386 int b = *(bool*) userdata;
1387
1388 return sd_bus_message_append_basic(reply, 'b', &b);
1389 }
1390
1391 int bus_property_set_bool(
1392 sd_bus *bus,
1393 const char *path,
1394 const char *interface,
1395 const char *property,
1396 sd_bus_message *value,
1397 void *userdata,
1398 sd_bus_error *error) {
1399
1400 int b, r;
1401
1402 r = sd_bus_message_read(value, "b", &b);
1403 if (r < 0)
1404 return r;
1405
1406 *(bool *) userdata = !!b;
1407 return 0;
1408 }
1409
1410 int bus_property_get_id128(
1411 sd_bus *bus,
1412 const char *path,
1413 const char *interface,
1414 const char *property,
1415 sd_bus_message *reply,
1416 void *userdata,
1417 sd_bus_error *error) {
1418
1419 sd_id128_t *id = userdata;
1420
1421 if (sd_id128_is_null(*id)) /* Add an empty array if the ID is zero */
1422 return sd_bus_message_append(reply, "ay", 0);
1423 else
1424 return sd_bus_message_append_array(reply, 'y', id->bytes, 16);
1425 }
1426
1427 #if __SIZEOF_SIZE_T__ != 8
1428 int bus_property_get_size(
1429 sd_bus *bus,
1430 const char *path,
1431 const char *interface,
1432 const char *property,
1433 sd_bus_message *reply,
1434 void *userdata,
1435 sd_bus_error *error) {
1436
1437 uint64_t sz = *(size_t*) userdata;
1438
1439 return sd_bus_message_append_basic(reply, 't', &sz);
1440 }
1441 #endif
1442
1443 #if __SIZEOF_LONG__ != 8
1444 int bus_property_get_long(
1445 sd_bus *bus,
1446 const char *path,
1447 const char *interface,
1448 const char *property,
1449 sd_bus_message *reply,
1450 void *userdata,
1451 sd_bus_error *error) {
1452
1453 int64_t l = *(long*) userdata;
1454
1455 return sd_bus_message_append_basic(reply, 'x', &l);
1456 }
1457
1458 int bus_property_get_ulong(
1459 sd_bus *bus,
1460 const char *path,
1461 const char *interface,
1462 const char *property,
1463 sd_bus_message *reply,
1464 void *userdata,
1465 sd_bus_error *error) {
1466
1467 uint64_t ul = *(unsigned long*) userdata;
1468
1469 return sd_bus_message_append_basic(reply, 't', &ul);
1470 }
1471 #endif
1472
1473 int bus_log_parse_error(int r) {
1474 return log_error_errno(r, "Failed to parse bus message: %m");
1475 }
1476
1477 int bus_log_create_error(int r) {
1478 return log_error_errno(r, "Failed to create bus message: %m");
1479 }
1480
1481 /**
1482 * bus_path_encode_unique() - encode unique object path
1483 * @b: bus connection or NULL
1484 * @prefix: object path prefix
1485 * @sender_id: unique-name of client, or NULL
1486 * @external_id: external ID to be chosen by client, or NULL
1487 * @ret_path: storage for encoded object path pointer
1488 *
1489 * Whenever we provide a bus API that allows clients to create and manage
1490 * server-side objects, we need to provide a unique name for these objects. If
1491 * we let the server choose the name, we suffer from a race condition: If a
1492 * client creates an object asynchronously, it cannot destroy that object until
1493 * it received the method reply. It cannot know the name of the new object,
1494 * thus, it cannot destroy it. Furthermore, it enforces a round-trip.
1495 *
1496 * Therefore, many APIs allow the client to choose the unique name for newly
1497 * created objects. There're two problems to solve, though:
1498 * 1) Object names are usually defined via dbus object paths, which are
1499 * usually globally namespaced. Therefore, multiple clients must be able
1500 * to choose unique object names without interference.
1501 * 2) If multiple libraries share the same bus connection, they must be
1502 * able to choose unique object names without interference.
1503 * The first problem is solved easily by prefixing a name with the
1504 * unique-bus-name of a connection. The server side must enforce this and
1505 * reject any other name. The second problem is solved by providing unique
1506 * suffixes from within sd-bus.
1507 *
1508 * This helper allows clients to create unique object-paths. It uses the
1509 * template '/prefix/sender_id/external_id' and returns the new path in
1510 * @ret_path (must be freed by the caller).
1511 * If @sender_id is NULL, the unique-name of @b is used. If @external_id is
1512 * NULL, this function allocates a unique suffix via @b (by requesting a new
1513 * cookie). If both @sender_id and @external_id are given, @b can be passed as
1514 * NULL.
1515 *
1516 * Returns: 0 on success, negative error code on failure.
1517 */
1518 int bus_path_encode_unique(sd_bus *b, const char *prefix, const char *sender_id, const char *external_id, char **ret_path) {
1519 _cleanup_free_ char *sender_label = NULL, *external_label = NULL;
1520 char external_buf[DECIMAL_STR_MAX(uint64_t)], *p;
1521 int r;
1522
1523 assert_return(b || (sender_id && external_id), -EINVAL);
1524 assert_return(object_path_is_valid(prefix), -EINVAL);
1525 assert_return(ret_path, -EINVAL);
1526
1527 if (!sender_id) {
1528 r = sd_bus_get_unique_name(b, &sender_id);
1529 if (r < 0)
1530 return r;
1531 }
1532
1533 if (!external_id) {
1534 xsprintf(external_buf, "%"PRIu64, ++b->cookie);
1535 external_id = external_buf;
1536 }
1537
1538 sender_label = bus_label_escape(sender_id);
1539 if (!sender_label)
1540 return -ENOMEM;
1541
1542 external_label = bus_label_escape(external_id);
1543 if (!external_label)
1544 return -ENOMEM;
1545
1546 p = strjoin(prefix, "/", sender_label, "/", external_label);
1547 if (!p)
1548 return -ENOMEM;
1549
1550 *ret_path = p;
1551 return 0;
1552 }
1553
1554 /**
1555 * bus_path_decode_unique() - decode unique object path
1556 * @path: object path to decode
1557 * @prefix: object path prefix
1558 * @ret_sender: output parameter for sender-id label
1559 * @ret_external: output parameter for external-id label
1560 *
1561 * This does the reverse of bus_path_encode_unique() (see its description for
1562 * details). Both trailing labels, sender-id and external-id, are unescaped and
1563 * returned in the given output parameters (the caller must free them).
1564 *
1565 * Note that this function returns 0 if the path does not match the template
1566 * (see bus_path_encode_unique()), 1 if it matched.
1567 *
1568 * Returns: Negative error code on failure, 0 if the given object path does not
1569 * match the template (return parameters are set to NULL), 1 if it was
1570 * parsed successfully (return parameters contain allocated labels).
1571 */
1572 int bus_path_decode_unique(const char *path, const char *prefix, char **ret_sender, char **ret_external) {
1573 const char *p, *q;
1574 char *sender, *external;
1575
1576 assert(object_path_is_valid(path));
1577 assert(object_path_is_valid(prefix));
1578 assert(ret_sender);
1579 assert(ret_external);
1580
1581 p = object_path_startswith(path, prefix);
1582 if (!p) {
1583 *ret_sender = NULL;
1584 *ret_external = NULL;
1585 return 0;
1586 }
1587
1588 q = strchr(p, '/');
1589 if (!q) {
1590 *ret_sender = NULL;
1591 *ret_external = NULL;
1592 return 0;
1593 }
1594
1595 sender = bus_label_unescape_n(p, q - p);
1596 external = bus_label_unescape(q + 1);
1597 if (!sender || !external) {
1598 free(sender);
1599 free(external);
1600 return -ENOMEM;
1601 }
1602
1603 *ret_sender = sender;
1604 *ret_external = external;
1605 return 1;
1606 }
1607
1608 int bus_property_get_rlimit(
1609 sd_bus *bus,
1610 const char *path,
1611 const char *interface,
1612 const char *property,
1613 sd_bus_message *reply,
1614 void *userdata,
1615 sd_bus_error *error) {
1616
1617 const char *is_soft;
1618 struct rlimit *rl;
1619 uint64_t u;
1620 rlim_t x;
1621
1622 assert(bus);
1623 assert(reply);
1624 assert(userdata);
1625
1626 is_soft = endswith(property, "Soft");
1627
1628 rl = *(struct rlimit**) userdata;
1629 if (rl)
1630 x = is_soft ? rl->rlim_cur : rl->rlim_max;
1631 else {
1632 struct rlimit buf = {};
1633 const char *s, *p;
1634 int z;
1635
1636 /* Chop off "Soft" suffix */
1637 s = is_soft ? strndupa(property, is_soft - property) : property;
1638
1639 /* Skip over any prefix, such as "Default" */
1640 assert_se(p = strstr(s, "Limit"));
1641
1642 z = rlimit_from_string(p + 5);
1643 assert(z >= 0);
1644
1645 (void) getrlimit(z, &buf);
1646 x = is_soft ? buf.rlim_cur : buf.rlim_max;
1647 }
1648
1649 /* rlim_t might have different sizes, let's map RLIMIT_INFINITY to (uint64_t) -1, so that it is the same on all
1650 * archs */
1651 u = x == RLIM_INFINITY ? (uint64_t) -1 : (uint64_t) x;
1652
1653 return sd_bus_message_append(reply, "t", u);
1654 }
1655
1656 int bus_track_add_name_many(sd_bus_track *t, char **l) {
1657 int r = 0;
1658 char **i;
1659
1660 assert(t);
1661
1662 /* Continues adding after failure, and returns the first failure. */
1663
1664 STRV_FOREACH(i, l) {
1665 int k;
1666
1667 k = sd_bus_track_add_name(t, *i);
1668 if (k < 0 && r >= 0)
1669 r = k;
1670 }
1671
1672 return r;
1673 }
1674
1675 int bus_open_system_watch_bind_with_description(sd_bus **ret, const char *description) {
1676 _cleanup_(sd_bus_unrefp) sd_bus *bus = NULL;
1677 const char *e;
1678 int r;
1679
1680 assert(ret);
1681
1682 /* Match like sd_bus_open_system(), but with the "watch_bind" feature and the Connected() signal turned on. */
1683
1684 r = sd_bus_new(&bus);
1685 if (r < 0)
1686 return r;
1687
1688 if (description) {
1689 r = sd_bus_set_description(bus, description);
1690 if (r < 0)
1691 return r;
1692 }
1693
1694 e = secure_getenv("DBUS_SYSTEM_BUS_ADDRESS");
1695 if (!e)
1696 e = DEFAULT_SYSTEM_BUS_ADDRESS;
1697
1698 r = sd_bus_set_address(bus, e);
1699 if (r < 0)
1700 return r;
1701
1702 r = sd_bus_set_bus_client(bus, true);
1703 if (r < 0)
1704 return r;
1705
1706 r = sd_bus_set_trusted(bus, true);
1707 if (r < 0)
1708 return r;
1709
1710 r = sd_bus_negotiate_creds(bus, true, SD_BUS_CREDS_UID|SD_BUS_CREDS_EUID|SD_BUS_CREDS_EFFECTIVE_CAPS);
1711 if (r < 0)
1712 return r;
1713
1714 r = sd_bus_set_watch_bind(bus, true);
1715 if (r < 0)
1716 return r;
1717
1718 r = sd_bus_set_connected_signal(bus, true);
1719 if (r < 0)
1720 return r;
1721
1722 r = sd_bus_start(bus);
1723 if (r < 0)
1724 return r;
1725
1726 *ret = TAKE_PTR(bus);
1727
1728 return 0;
1729 }
1730
1731 struct request_name_data {
1732 unsigned n_ref;
1733
1734 const char *name;
1735 uint64_t flags;
1736 void *userdata;
1737 };
1738
1739 static void request_name_destroy_callback(void *userdata) {
1740 struct request_name_data *data = userdata;
1741
1742 assert(data);
1743 assert(data->n_ref > 0);
1744
1745 log_info("%s n_ref=%u", __func__, data->n_ref);
1746
1747 data->n_ref--;
1748 if (data->n_ref == 0)
1749 free(data);
1750 }
1751
1752 static int reload_dbus_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
1753 struct request_name_data *data = userdata;
1754 const sd_bus_error *e;
1755 int r;
1756
1757 assert(data);
1758 assert(data->name);
1759 assert(data->n_ref > 0);
1760
1761 e = sd_bus_message_get_error(m);
1762 if (e) {
1763 log_error_errno(sd_bus_error_get_errno(e), "Failed to reload DBus configuration: %s", e->message);
1764 return 1;
1765 }
1766
1767 /* Here, use the default request name handler to avoid an infinite loop of reloading and requesting. */
1768 r = sd_bus_request_name_async(sd_bus_message_get_bus(m), NULL, data->name, data->flags, NULL, data->userdata);
1769 if (r < 0)
1770 log_error_errno(r, "Failed to request name: %m");
1771
1772 return 1;
1773 }
1774
1775 static int request_name_handler_may_reload_dbus(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
1776 struct request_name_data *data = userdata;
1777 uint32_t ret;
1778 int r;
1779
1780 assert(m);
1781 assert(data);
1782
1783 if (sd_bus_message_is_method_error(m, NULL)) {
1784 const sd_bus_error *e = sd_bus_message_get_error(m);
1785 _cleanup_(sd_bus_slot_unrefp) sd_bus_slot *slot = NULL;
1786
1787 if (!sd_bus_error_has_name(e, SD_BUS_ERROR_ACCESS_DENIED)) {
1788 log_debug_errno(sd_bus_error_get_errno(e),
1789 "Unable to request name, failing connection: %s",
1790 e->message);
1791
1792 bus_enter_closing(sd_bus_message_get_bus(m));
1793 return 1;
1794 }
1795
1796 log_debug_errno(sd_bus_error_get_errno(e),
1797 "Unable to request name, will retry after reloading DBus configuration: %s",
1798 e->message);
1799
1800 /* If systemd-timesyncd.service enables DynamicUser= and dbus.service
1801 * started before the dynamic user is realized, then the DBus policy
1802 * about timesyncd has not been enabled yet. So, let's try to reload
1803 * DBus configuration, and after that request the name again. Note that it
1804 * seems that no privileges are necessary to call the following method. */
1805
1806 r = sd_bus_call_method_async(
1807 sd_bus_message_get_bus(m),
1808 &slot,
1809 "org.freedesktop.DBus",
1810 "/org/freedesktop/DBus",
1811 "org.freedesktop.DBus",
1812 "ReloadConfig",
1813 reload_dbus_handler,
1814 data, NULL);
1815 if (r < 0) {
1816 log_error_errno(r, "Failed to reload DBus configuration: %m");
1817 bus_enter_closing(sd_bus_message_get_bus(m));
1818 return 1;
1819 }
1820
1821 data->n_ref ++;
1822 assert_se(sd_bus_slot_set_destroy_callback(slot, request_name_destroy_callback) >= 0);
1823
1824 r = sd_bus_slot_set_floating(slot, true);
1825 if (r < 0)
1826 return r;
1827
1828 return 1;
1829 }
1830
1831 r = sd_bus_message_read(m, "u", &ret);
1832 if (r < 0)
1833 return r;
1834
1835 switch (ret) {
1836
1837 case BUS_NAME_ALREADY_OWNER:
1838 log_debug("Already owner of requested service name, ignoring.");
1839 return 1;
1840
1841 case BUS_NAME_IN_QUEUE:
1842 log_debug("In queue for requested service name.");
1843 return 1;
1844
1845 case BUS_NAME_PRIMARY_OWNER:
1846 log_debug("Successfully acquired requested service name.");
1847 return 1;
1848
1849 case BUS_NAME_EXISTS:
1850 log_debug("Requested service name already owned, failing connection.");
1851 bus_enter_closing(sd_bus_message_get_bus(m));
1852 return 1;
1853 }
1854
1855 log_debug("Unexpected response from RequestName(), failing connection.");
1856 bus_enter_closing(sd_bus_message_get_bus(m));
1857 return 1;
1858 }
1859
1860 int bus_request_name_async_may_reload_dbus(sd_bus *bus, sd_bus_slot **ret_slot, const char *name, uint64_t flags, void *userdata) {
1861 _cleanup_free_ struct request_name_data *data = NULL;
1862 _cleanup_(sd_bus_slot_unrefp) sd_bus_slot *slot = NULL;
1863 int r;
1864
1865 data = new(struct request_name_data, 1);
1866 if (!data)
1867 return -ENOMEM;
1868
1869 *data = (struct request_name_data) {
1870 .n_ref = 1,
1871 .name = name,
1872 .flags = flags,
1873 .userdata = userdata,
1874 };
1875
1876 r = sd_bus_request_name_async(bus, &slot, name, flags, request_name_handler_may_reload_dbus, data);
1877 if (r < 0)
1878 return r;
1879
1880 assert_se(sd_bus_slot_set_destroy_callback(slot, request_name_destroy_callback) >= 0);
1881 TAKE_PTR(data);
1882
1883 if (ret_slot)
1884 *ret_slot = TAKE_PTR(slot);
1885 else {
1886 r = sd_bus_slot_set_floating(slot, true);
1887 if (r < 0)
1888 return r;
1889 }
1890
1891 return 0;
1892 }
1893
1894 int bus_reply_pair_array(sd_bus_message *m, char **l) {
1895 _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
1896 char **k, **v;
1897 int r;
1898
1899 assert(m);
1900
1901 /* Reply to the specified message with a message containing a dictionary put together from the specified
1902 * strv */
1903
1904 r = sd_bus_message_new_method_return(m, &reply);
1905 if (r < 0)
1906 return r;
1907
1908 r = sd_bus_message_open_container(reply, 'a', "{ss}");
1909 if (r < 0)
1910 return r;
1911
1912 STRV_FOREACH_PAIR(k, v, l) {
1913 r = sd_bus_message_append(reply, "{ss}", *k, *v);
1914 if (r < 0)
1915 return r;
1916 }
1917
1918 r = sd_bus_message_close_container(reply);
1919 if (r < 0)
1920 return r;
1921
1922 return sd_bus_send(NULL, reply, NULL);
1923 }
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