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Merge pull request #15681 from vcaputo/buslocator
[thirdparty/systemd.git] / src / core / dbus-unit.c
1 /* SPDX-License-Identifier: LGPL-2.1+ */
2
3 #include "sd-bus.h"
4
5 #include "alloc-util.h"
6 #include "bpf-firewall.h"
7 #include "bus-common-errors.h"
8 #include "bus-polkit.h"
9 #include "bus-util.h"
10 #include "cgroup-util.h"
11 #include "condition.h"
12 #include "dbus-job.h"
13 #include "dbus-unit.h"
14 #include "dbus-util.h"
15 #include "dbus.h"
16 #include "fd-util.h"
17 #include "install.h"
18 #include "locale-util.h"
19 #include "log.h"
20 #include "path-util.h"
21 #include "process-util.h"
22 #include "selinux-access.h"
23 #include "signal-util.h"
24 #include "special.h"
25 #include "string-table.h"
26 #include "string-util.h"
27 #include "strv.h"
28 #include "user-util.h"
29 #include "web-util.h"
30
31 static bool unit_can_start_refuse_manual(Unit *u) {
32 return unit_can_start(u) && !u->refuse_manual_start;
33 }
34
35 static bool unit_can_stop_refuse_manual(Unit *u) {
36 return unit_can_stop(u) && !u->refuse_manual_stop;
37 }
38
39 static bool unit_can_isolate_refuse_manual(Unit *u) {
40 return unit_can_isolate(u) && !u->refuse_manual_start;
41 }
42
43 static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_collect_mode, collect_mode, CollectMode);
44 static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_load_state, unit_load_state, UnitLoadState);
45 static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_job_mode, job_mode, JobMode);
46 static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_emergency_action, emergency_action, EmergencyAction);
47 static BUS_DEFINE_PROPERTY_GET(property_get_description, "s", Unit, unit_description);
48 static BUS_DEFINE_PROPERTY_GET2(property_get_active_state, "s", Unit, unit_active_state, unit_active_state_to_string);
49 static BUS_DEFINE_PROPERTY_GET2(property_get_freezer_state, "s", Unit, unit_freezer_state, freezer_state_to_string);
50 static BUS_DEFINE_PROPERTY_GET(property_get_sub_state, "s", Unit, unit_sub_state_to_string);
51 static BUS_DEFINE_PROPERTY_GET2(property_get_unit_file_state, "s", Unit, unit_get_unit_file_state, unit_file_state_to_string);
52 static BUS_DEFINE_PROPERTY_GET(property_get_can_reload, "b", Unit, unit_can_reload);
53 static BUS_DEFINE_PROPERTY_GET(property_get_can_start, "b", Unit, unit_can_start_refuse_manual);
54 static BUS_DEFINE_PROPERTY_GET(property_get_can_stop, "b", Unit, unit_can_stop_refuse_manual);
55 static BUS_DEFINE_PROPERTY_GET(property_get_can_isolate, "b", Unit, unit_can_isolate_refuse_manual);
56 static BUS_DEFINE_PROPERTY_GET(property_get_can_freeze, "b", Unit, unit_can_freeze);
57 static BUS_DEFINE_PROPERTY_GET(property_get_need_daemon_reload, "b", Unit, unit_need_daemon_reload);
58 static BUS_DEFINE_PROPERTY_GET_GLOBAL(property_get_empty_strv, "as", 0);
59
60 static int property_get_can_clean(
61 sd_bus *bus,
62 const char *path,
63 const char *interface,
64 const char *property,
65 sd_bus_message *reply,
66 void *userdata,
67 sd_bus_error *error) {
68
69 Unit *u = userdata;
70 ExecCleanMask mask;
71 int r;
72
73 assert(bus);
74 assert(reply);
75
76 r = unit_can_clean(u, &mask);
77 if (r < 0)
78 return r;
79
80 r = sd_bus_message_open_container(reply, 'a', "s");
81 if (r < 0)
82 return r;
83
84 for (ExecDirectoryType t = 0; t < _EXEC_DIRECTORY_TYPE_MAX; t++) {
85 if (!FLAGS_SET(mask, 1U << t))
86 continue;
87
88 r = sd_bus_message_append(reply, "s", exec_resource_type_to_string(t));
89 if (r < 0)
90 return r;
91 }
92
93 return sd_bus_message_close_container(reply);
94 }
95
96 static int property_get_names(
97 sd_bus *bus,
98 const char *path,
99 const char *interface,
100 const char *property,
101 sd_bus_message *reply,
102 void *userdata,
103 sd_bus_error *error) {
104
105 Set **s = userdata;
106 Iterator i;
107 const char *t;
108 int r;
109
110 assert(bus);
111 assert(reply);
112 assert(s);
113
114 r = sd_bus_message_open_container(reply, 'a', "s");
115 if (r < 0)
116 return r;
117
118 SET_FOREACH(t, *s, i) {
119 r = sd_bus_message_append(reply, "s", t);
120 if (r < 0)
121 return r;
122 }
123
124 return sd_bus_message_close_container(reply);
125 }
126
127 static int property_get_following(
128 sd_bus *bus,
129 const char *path,
130 const char *interface,
131 const char *property,
132 sd_bus_message *reply,
133 void *userdata,
134 sd_bus_error *error) {
135
136 Unit *u = userdata, *f;
137
138 assert(bus);
139 assert(reply);
140 assert(u);
141
142 f = unit_following(u);
143 return sd_bus_message_append(reply, "s", f ? f->id : NULL);
144 }
145
146 static int property_get_dependencies(
147 sd_bus *bus,
148 const char *path,
149 const char *interface,
150 const char *property,
151 sd_bus_message *reply,
152 void *userdata,
153 sd_bus_error *error) {
154
155 Hashmap **h = userdata;
156 Iterator j;
157 Unit *u;
158 void *v;
159 int r;
160
161 assert(bus);
162 assert(reply);
163 assert(h);
164
165 r = sd_bus_message_open_container(reply, 'a', "s");
166 if (r < 0)
167 return r;
168
169 HASHMAP_FOREACH_KEY(v, u, *h, j) {
170 r = sd_bus_message_append(reply, "s", u->id);
171 if (r < 0)
172 return r;
173 }
174
175 return sd_bus_message_close_container(reply);
176 }
177
178 static int property_get_requires_mounts_for(
179 sd_bus *bus,
180 const char *path,
181 const char *interface,
182 const char *property,
183 sd_bus_message *reply,
184 void *userdata,
185 sd_bus_error *error) {
186
187 Hashmap **h = userdata;
188 const char *p;
189 Iterator j;
190 void *v;
191 int r;
192
193 assert(bus);
194 assert(reply);
195 assert(h);
196
197 r = sd_bus_message_open_container(reply, 'a', "s");
198 if (r < 0)
199 return r;
200
201 HASHMAP_FOREACH_KEY(v, p, *h, j) {
202 r = sd_bus_message_append(reply, "s", p);
203 if (r < 0)
204 return r;
205 }
206
207 return sd_bus_message_close_container(reply);
208 }
209
210 static int property_get_unit_file_preset(
211 sd_bus *bus,
212 const char *path,
213 const char *interface,
214 const char *property,
215 sd_bus_message *reply,
216 void *userdata,
217 sd_bus_error *error) {
218
219 Unit *u = userdata;
220 int r;
221
222 assert(bus);
223 assert(reply);
224 assert(u);
225
226 r = unit_get_unit_file_preset(u);
227
228 return sd_bus_message_append(reply, "s",
229 r < 0 ? NULL:
230 r > 0 ? "enabled" : "disabled");
231 }
232
233 static int property_get_job(
234 sd_bus *bus,
235 const char *path,
236 const char *interface,
237 const char *property,
238 sd_bus_message *reply,
239 void *userdata,
240 sd_bus_error *error) {
241
242 _cleanup_free_ char *p = NULL;
243 Job **j = userdata;
244
245 assert(bus);
246 assert(reply);
247 assert(j);
248
249 if (!*j)
250 return sd_bus_message_append(reply, "(uo)", 0, "/");
251
252 p = job_dbus_path(*j);
253 if (!p)
254 return -ENOMEM;
255
256 return sd_bus_message_append(reply, "(uo)", (*j)->id, p);
257 }
258
259 static int property_get_conditions(
260 sd_bus *bus,
261 const char *path,
262 const char *interface,
263 const char *property,
264 sd_bus_message *reply,
265 void *userdata,
266 sd_bus_error *error) {
267
268 const char *(*to_string)(ConditionType type) = NULL;
269 Condition **list = userdata, *c;
270 int r;
271
272 assert(bus);
273 assert(reply);
274 assert(list);
275
276 to_string = streq(property, "Asserts") ? assert_type_to_string : condition_type_to_string;
277
278 r = sd_bus_message_open_container(reply, 'a', "(sbbsi)");
279 if (r < 0)
280 return r;
281
282 LIST_FOREACH(conditions, c, *list) {
283 int tristate;
284
285 tristate =
286 c->result == CONDITION_UNTESTED ? 0 :
287 c->result == CONDITION_SUCCEEDED ? 1 : -1;
288
289 r = sd_bus_message_append(reply, "(sbbsi)",
290 to_string(c->type),
291 c->trigger, c->negate,
292 c->parameter, tristate);
293 if (r < 0)
294 return r;
295
296 }
297
298 return sd_bus_message_close_container(reply);
299 }
300
301 static int property_get_load_error(
302 sd_bus *bus,
303 const char *path,
304 const char *interface,
305 const char *property,
306 sd_bus_message *reply,
307 void *userdata,
308 sd_bus_error *error) {
309
310 _cleanup_(sd_bus_error_free) sd_bus_error e = SD_BUS_ERROR_NULL;
311 Unit *u = userdata;
312 int r;
313
314 assert(bus);
315 assert(reply);
316 assert(u);
317
318 r = bus_unit_validate_load_state(u, &e);
319 if (r < 0)
320 return sd_bus_message_append(reply, "(ss)", e.name, e.message);
321
322 return sd_bus_message_append(reply, "(ss)", NULL, NULL);
323 }
324
325 static int bus_verify_manage_units_async_full(
326 Unit *u,
327 const char *verb,
328 int capability,
329 const char *polkit_message,
330 bool interactive,
331 sd_bus_message *call,
332 sd_bus_error *error) {
333
334 const char *details[9] = {
335 "unit", u->id,
336 "verb", verb,
337 };
338
339 if (polkit_message) {
340 details[4] = "polkit.message";
341 details[5] = polkit_message;
342 details[6] = "polkit.gettext_domain";
343 details[7] = GETTEXT_PACKAGE;
344 }
345
346 return bus_verify_polkit_async(
347 call,
348 capability,
349 "org.freedesktop.systemd1.manage-units",
350 details,
351 interactive,
352 UID_INVALID,
353 &u->manager->polkit_registry,
354 error);
355 }
356
357 static const char *const polkit_message_for_job[_JOB_TYPE_MAX] = {
358 [JOB_START] = N_("Authentication is required to start '$(unit)'."),
359 [JOB_STOP] = N_("Authentication is required to stop '$(unit)'."),
360 [JOB_RELOAD] = N_("Authentication is required to reload '$(unit)'."),
361 [JOB_RESTART] = N_("Authentication is required to restart '$(unit)'."),
362 [JOB_TRY_RESTART] = N_("Authentication is required to restart '$(unit)'."),
363 };
364
365 int bus_unit_method_start_generic(
366 sd_bus_message *message,
367 Unit *u,
368 JobType job_type,
369 bool reload_if_possible,
370 sd_bus_error *error) {
371
372 const char *smode, *verb;
373 JobMode mode;
374 int r;
375
376 assert(message);
377 assert(u);
378 assert(job_type >= 0 && job_type < _JOB_TYPE_MAX);
379
380 r = mac_selinux_unit_access_check(
381 u, message,
382 job_type_to_access_method(job_type),
383 error);
384 if (r < 0)
385 return r;
386
387 r = sd_bus_message_read(message, "s", &smode);
388 if (r < 0)
389 return r;
390
391 mode = job_mode_from_string(smode);
392 if (mode < 0)
393 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Job mode %s invalid", smode);
394
395 if (reload_if_possible)
396 verb = strjoina("reload-or-", job_type_to_string(job_type));
397 else
398 verb = job_type_to_string(job_type);
399
400 r = bus_verify_manage_units_async_full(
401 u,
402 verb,
403 CAP_SYS_ADMIN,
404 polkit_message_for_job[job_type],
405 true,
406 message,
407 error);
408 if (r < 0)
409 return r;
410 if (r == 0)
411 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
412
413 return bus_unit_queue_job(message, u, job_type, mode,
414 reload_if_possible ? BUS_UNIT_QUEUE_RELOAD_IF_POSSIBLE : 0, error);
415 }
416
417 static int method_start(sd_bus_message *message, void *userdata, sd_bus_error *error) {
418 return bus_unit_method_start_generic(message, userdata, JOB_START, false, error);
419 }
420
421 static int method_stop(sd_bus_message *message, void *userdata, sd_bus_error *error) {
422 return bus_unit_method_start_generic(message, userdata, JOB_STOP, false, error);
423 }
424
425 static int method_reload(sd_bus_message *message, void *userdata, sd_bus_error *error) {
426 return bus_unit_method_start_generic(message, userdata, JOB_RELOAD, false, error);
427 }
428
429 static int method_restart(sd_bus_message *message, void *userdata, sd_bus_error *error) {
430 return bus_unit_method_start_generic(message, userdata, JOB_RESTART, false, error);
431 }
432
433 static int method_try_restart(sd_bus_message *message, void *userdata, sd_bus_error *error) {
434 return bus_unit_method_start_generic(message, userdata, JOB_TRY_RESTART, false, error);
435 }
436
437 static int method_reload_or_restart(sd_bus_message *message, void *userdata, sd_bus_error *error) {
438 return bus_unit_method_start_generic(message, userdata, JOB_RESTART, true, error);
439 }
440
441 static int method_reload_or_try_restart(sd_bus_message *message, void *userdata, sd_bus_error *error) {
442 return bus_unit_method_start_generic(message, userdata, JOB_TRY_RESTART, true, error);
443 }
444
445 int bus_unit_method_enqueue_job(sd_bus_message *message, void *userdata, sd_bus_error *error) {
446 BusUnitQueueFlags flags = BUS_UNIT_QUEUE_VERBOSE_REPLY;
447 const char *jtype, *smode;
448 Unit *u = userdata;
449 JobType type;
450 JobMode mode;
451 int r;
452
453 assert(message);
454 assert(u);
455
456 r = sd_bus_message_read(message, "ss", &jtype, &smode);
457 if (r < 0)
458 return r;
459
460 /* Parse the two magic reload types "reload-or-…" manually */
461 if (streq(jtype, "reload-or-restart")) {
462 type = JOB_RESTART;
463 flags |= BUS_UNIT_QUEUE_RELOAD_IF_POSSIBLE;
464 } else if (streq(jtype, "reload-or-try-restart")) {
465 type = JOB_TRY_RESTART;
466 flags |= BUS_UNIT_QUEUE_RELOAD_IF_POSSIBLE;
467 } else {
468 /* And the rest generically */
469 type = job_type_from_string(jtype);
470 if (type < 0)
471 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Job type %s invalid", jtype);
472 }
473
474 mode = job_mode_from_string(smode);
475 if (mode < 0)
476 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Job mode %s invalid", smode);
477
478 r = mac_selinux_unit_access_check(
479 u, message,
480 job_type_to_access_method(type),
481 error);
482 if (r < 0)
483 return r;
484
485 r = bus_verify_manage_units_async_full(
486 u,
487 jtype,
488 CAP_SYS_ADMIN,
489 polkit_message_for_job[type],
490 true,
491 message,
492 error);
493 if (r < 0)
494 return r;
495 if (r == 0)
496 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
497
498 return bus_unit_queue_job(message, u, type, mode, flags, error);
499 }
500
501 int bus_unit_method_kill(sd_bus_message *message, void *userdata, sd_bus_error *error) {
502 Unit *u = userdata;
503 const char *swho;
504 int32_t signo;
505 KillWho who;
506 int r;
507
508 assert(message);
509 assert(u);
510
511 r = mac_selinux_unit_access_check(u, message, "stop", error);
512 if (r < 0)
513 return r;
514
515 r = sd_bus_message_read(message, "si", &swho, &signo);
516 if (r < 0)
517 return r;
518
519 if (isempty(swho))
520 who = KILL_ALL;
521 else {
522 who = kill_who_from_string(swho);
523 if (who < 0)
524 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid who argument %s", swho);
525 }
526
527 if (!SIGNAL_VALID(signo))
528 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Signal number out of range.");
529
530 r = bus_verify_manage_units_async_full(
531 u,
532 "kill",
533 CAP_KILL,
534 N_("Authentication is required to send a UNIX signal to the processes of '$(unit)'."),
535 true,
536 message,
537 error);
538 if (r < 0)
539 return r;
540 if (r == 0)
541 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
542
543 r = unit_kill(u, who, signo, error);
544 if (r < 0)
545 return r;
546
547 return sd_bus_reply_method_return(message, NULL);
548 }
549
550 int bus_unit_method_reset_failed(sd_bus_message *message, void *userdata, sd_bus_error *error) {
551 Unit *u = userdata;
552 int r;
553
554 assert(message);
555 assert(u);
556
557 r = mac_selinux_unit_access_check(u, message, "reload", error);
558 if (r < 0)
559 return r;
560
561 r = bus_verify_manage_units_async_full(
562 u,
563 "reset-failed",
564 CAP_SYS_ADMIN,
565 N_("Authentication is required to reset the \"failed\" state of '$(unit)'."),
566 true,
567 message,
568 error);
569 if (r < 0)
570 return r;
571 if (r == 0)
572 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
573
574 unit_reset_failed(u);
575
576 return sd_bus_reply_method_return(message, NULL);
577 }
578
579 int bus_unit_method_set_properties(sd_bus_message *message, void *userdata, sd_bus_error *error) {
580 Unit *u = userdata;
581 int runtime, r;
582
583 assert(message);
584 assert(u);
585
586 r = mac_selinux_unit_access_check(u, message, "start", error);
587 if (r < 0)
588 return r;
589
590 r = sd_bus_message_read(message, "b", &runtime);
591 if (r < 0)
592 return r;
593
594 r = bus_verify_manage_units_async_full(
595 u,
596 "set-property",
597 CAP_SYS_ADMIN,
598 N_("Authentication is required to set properties on '$(unit)'."),
599 true,
600 message,
601 error);
602 if (r < 0)
603 return r;
604 if (r == 0)
605 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
606
607 r = bus_unit_set_properties(u, message, runtime ? UNIT_RUNTIME : UNIT_PERSISTENT, true, error);
608 if (r < 0)
609 return r;
610
611 return sd_bus_reply_method_return(message, NULL);
612 }
613
614 int bus_unit_method_ref(sd_bus_message *message, void *userdata, sd_bus_error *error) {
615 Unit *u = userdata;
616 int r;
617
618 assert(message);
619 assert(u);
620
621 r = mac_selinux_unit_access_check(u, message, "start", error);
622 if (r < 0)
623 return r;
624
625 r = bus_verify_manage_units_async_full(
626 u,
627 "ref",
628 CAP_SYS_ADMIN,
629 NULL,
630 false,
631 message,
632 error);
633 if (r < 0)
634 return r;
635 if (r == 0)
636 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
637
638 r = bus_unit_track_add_sender(u, message);
639 if (r < 0)
640 return r;
641
642 return sd_bus_reply_method_return(message, NULL);
643 }
644
645 int bus_unit_method_unref(sd_bus_message *message, void *userdata, sd_bus_error *error) {
646 Unit *u = userdata;
647 int r;
648
649 assert(message);
650 assert(u);
651
652 r = bus_unit_track_remove_sender(u, message);
653 if (r == -EUNATCH)
654 return sd_bus_error_setf(error, BUS_ERROR_NOT_REFERENCED, "Unit has not been referenced yet.");
655 if (r < 0)
656 return r;
657
658 return sd_bus_reply_method_return(message, NULL);
659 }
660
661 int bus_unit_method_clean(sd_bus_message *message, void *userdata, sd_bus_error *error) {
662 ExecCleanMask mask = 0;
663 Unit *u = userdata;
664 int r;
665
666 assert(message);
667 assert(u);
668
669 r = mac_selinux_unit_access_check(u, message, "stop", error);
670 if (r < 0)
671 return r;
672
673 r = sd_bus_message_enter_container(message, 'a', "s");
674 if (r < 0)
675 return r;
676
677 for (;;) {
678 const char *i;
679
680 r = sd_bus_message_read(message, "s", &i);
681 if (r < 0)
682 return r;
683 if (r == 0)
684 break;
685
686 if (streq(i, "all"))
687 mask |= EXEC_CLEAN_ALL;
688 else {
689 ExecDirectoryType t;
690
691 t = exec_resource_type_from_string(i);
692 if (t < 0)
693 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid resource type: %s", i);
694
695 mask |= 1U << t;
696 }
697 }
698
699 r = sd_bus_message_exit_container(message);
700 if (r < 0)
701 return r;
702
703 r = bus_verify_manage_units_async_full(
704 u,
705 "clean",
706 CAP_DAC_OVERRIDE,
707 N_("Authentication is required to delete files and directories associated with '$(unit)'."),
708 true,
709 message,
710 error);
711 if (r < 0)
712 return r;
713 if (r == 0)
714 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
715
716 r = unit_clean(u, mask);
717 if (r == -EOPNOTSUPP)
718 return sd_bus_error_setf(error, SD_BUS_ERROR_NOT_SUPPORTED, "Unit '%s' does not supporting cleaning.", u->id);
719 if (r == -EUNATCH)
720 return sd_bus_error_setf(error, BUS_ERROR_NOTHING_TO_CLEAN, "No matching resources found.");
721 if (r == -EBUSY)
722 return sd_bus_error_setf(error, BUS_ERROR_UNIT_BUSY, "Unit is not inactive or has pending job.");
723 if (r < 0)
724 return r;
725
726 return sd_bus_reply_method_return(message, NULL);
727 }
728
729 static int bus_unit_method_freezer_generic(sd_bus_message *message, void *userdata, sd_bus_error *error, FreezerAction action) {
730 const char* perm;
731 int (*method)(Unit*);
732 Unit *u = userdata;
733 bool reply_no_delay = false;
734 int r;
735
736 assert(message);
737 assert(u);
738 assert(IN_SET(action, FREEZER_FREEZE, FREEZER_THAW));
739
740 if (action == FREEZER_FREEZE) {
741 perm = "stop";
742 method = unit_freeze;
743 } else {
744 perm = "start";
745 method = unit_thaw;
746 }
747
748 r = mac_selinux_unit_access_check(u, message, perm, error);
749 if (r < 0)
750 return r;
751
752 r = bus_verify_manage_units_async_full(
753 u,
754 perm,
755 CAP_SYS_ADMIN,
756 N_("Authentication is required to freeze or thaw the processes of '$(unit)' unit."),
757 true,
758 message,
759 error);
760 if (r < 0)
761 return r;
762 if (r == 0)
763 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
764
765 r = method(u);
766 if (r == -EOPNOTSUPP)
767 return sd_bus_error_setf(error, SD_BUS_ERROR_NOT_SUPPORTED, "Unit '%s' does not support freezing.", u->id);
768 if (r == -EBUSY)
769 return sd_bus_error_setf(error, BUS_ERROR_UNIT_BUSY, "Unit has a pending job.");
770 if (r == -EHOSTDOWN)
771 return sd_bus_error_setf(error, BUS_ERROR_UNIT_INACTIVE, "Unit is inactive.");
772 if (r == -EALREADY)
773 return sd_bus_error_setf(error, SD_BUS_ERROR_FAILED, "Previously requested freezer operation for unit '%s' is still in progress.", u->id);
774 if (r < 0)
775 return r;
776 if (r == 0)
777 reply_no_delay = true;
778
779 assert(!u->pending_freezer_message);
780
781 r = sd_bus_message_new_method_return(message, &u->pending_freezer_message);
782 if (r < 0)
783 return r;
784
785 if (reply_no_delay) {
786 r = bus_unit_send_pending_freezer_message(u);
787 if (r < 0)
788 return r;
789 }
790
791 return 1;
792 }
793
794 int bus_unit_method_thaw(sd_bus_message *message, void *userdata, sd_bus_error *error) {
795 return bus_unit_method_freezer_generic(message, userdata, error, FREEZER_THAW);
796 }
797
798 int bus_unit_method_freeze(sd_bus_message *message, void *userdata, sd_bus_error *error) {
799 return bus_unit_method_freezer_generic(message, userdata, error, FREEZER_FREEZE);
800 }
801
802 static int property_get_refs(
803 sd_bus *bus,
804 const char *path,
805 const char *interface,
806 const char *property,
807 sd_bus_message *reply,
808 void *userdata,
809 sd_bus_error *error) {
810
811 Unit *u = userdata;
812 const char *i;
813 int r;
814
815 assert(bus);
816 assert(reply);
817
818 r = sd_bus_message_open_container(reply, 'a', "s");
819 if (r < 0)
820 return r;
821
822 for (i = sd_bus_track_first(u->bus_track); i; i = sd_bus_track_next(u->bus_track)) {
823 int c, k;
824
825 c = sd_bus_track_count_name(u->bus_track, i);
826 if (c < 0)
827 return c;
828
829 /* Add the item multiple times if the ref count for each is above 1 */
830 for (k = 0; k < c; k++) {
831 r = sd_bus_message_append(reply, "s", i);
832 if (r < 0)
833 return r;
834 }
835 }
836
837 return sd_bus_message_close_container(reply);
838 }
839
840 const sd_bus_vtable bus_unit_vtable[] = {
841 SD_BUS_VTABLE_START(0),
842
843 SD_BUS_PROPERTY("Id", "s", NULL, offsetof(Unit, id), SD_BUS_VTABLE_PROPERTY_CONST),
844 SD_BUS_PROPERTY("Names", "as", property_get_names, offsetof(Unit, names), SD_BUS_VTABLE_PROPERTY_CONST),
845 SD_BUS_PROPERTY("Following", "s", property_get_following, 0, 0),
846 SD_BUS_PROPERTY("Requires", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_REQUIRES]), SD_BUS_VTABLE_PROPERTY_CONST),
847 SD_BUS_PROPERTY("Requisite", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_REQUISITE]), SD_BUS_VTABLE_PROPERTY_CONST),
848 SD_BUS_PROPERTY("Wants", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_WANTS]), SD_BUS_VTABLE_PROPERTY_CONST),
849 SD_BUS_PROPERTY("BindsTo", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_BINDS_TO]), SD_BUS_VTABLE_PROPERTY_CONST),
850 SD_BUS_PROPERTY("PartOf", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_PART_OF]), SD_BUS_VTABLE_PROPERTY_CONST),
851 SD_BUS_PROPERTY("RequiredBy", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_REQUIRED_BY]), SD_BUS_VTABLE_PROPERTY_CONST),
852 SD_BUS_PROPERTY("RequisiteOf", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_REQUISITE_OF]), SD_BUS_VTABLE_PROPERTY_CONST),
853 SD_BUS_PROPERTY("WantedBy", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_WANTED_BY]), SD_BUS_VTABLE_PROPERTY_CONST),
854 SD_BUS_PROPERTY("BoundBy", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_BOUND_BY]), SD_BUS_VTABLE_PROPERTY_CONST),
855 SD_BUS_PROPERTY("ConsistsOf", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_CONSISTS_OF]), SD_BUS_VTABLE_PROPERTY_CONST),
856 SD_BUS_PROPERTY("Conflicts", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_CONFLICTS]), SD_BUS_VTABLE_PROPERTY_CONST),
857 SD_BUS_PROPERTY("ConflictedBy", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_CONFLICTED_BY]), SD_BUS_VTABLE_PROPERTY_CONST),
858 SD_BUS_PROPERTY("Before", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_BEFORE]), SD_BUS_VTABLE_PROPERTY_CONST),
859 SD_BUS_PROPERTY("After", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_AFTER]), SD_BUS_VTABLE_PROPERTY_CONST),
860 SD_BUS_PROPERTY("OnFailure", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_ON_FAILURE]), SD_BUS_VTABLE_PROPERTY_CONST),
861 SD_BUS_PROPERTY("Triggers", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_TRIGGERS]), SD_BUS_VTABLE_PROPERTY_CONST),
862 SD_BUS_PROPERTY("TriggeredBy", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_TRIGGERED_BY]), SD_BUS_VTABLE_PROPERTY_CONST),
863 SD_BUS_PROPERTY("PropagatesReloadTo", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_PROPAGATES_RELOAD_TO]), SD_BUS_VTABLE_PROPERTY_CONST),
864 SD_BUS_PROPERTY("ReloadPropagatedFrom", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_RELOAD_PROPAGATED_FROM]), SD_BUS_VTABLE_PROPERTY_CONST),
865 SD_BUS_PROPERTY("JoinsNamespaceOf", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_JOINS_NAMESPACE_OF]), SD_BUS_VTABLE_PROPERTY_CONST),
866 SD_BUS_PROPERTY("RequiresMountsFor", "as", property_get_requires_mounts_for, offsetof(Unit, requires_mounts_for), SD_BUS_VTABLE_PROPERTY_CONST),
867 SD_BUS_PROPERTY("Documentation", "as", NULL, offsetof(Unit, documentation), SD_BUS_VTABLE_PROPERTY_CONST),
868 SD_BUS_PROPERTY("Description", "s", property_get_description, 0, SD_BUS_VTABLE_PROPERTY_CONST),
869 SD_BUS_PROPERTY("LoadState", "s", property_get_load_state, offsetof(Unit, load_state), SD_BUS_VTABLE_PROPERTY_CONST),
870 SD_BUS_PROPERTY("ActiveState", "s", property_get_active_state, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
871 SD_BUS_PROPERTY("FreezerState", "s", property_get_freezer_state, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
872 SD_BUS_PROPERTY("SubState", "s", property_get_sub_state, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
873 SD_BUS_PROPERTY("FragmentPath", "s", NULL, offsetof(Unit, fragment_path), SD_BUS_VTABLE_PROPERTY_CONST),
874 SD_BUS_PROPERTY("SourcePath", "s", NULL, offsetof(Unit, source_path), SD_BUS_VTABLE_PROPERTY_CONST),
875 SD_BUS_PROPERTY("DropInPaths", "as", NULL, offsetof(Unit, dropin_paths), SD_BUS_VTABLE_PROPERTY_CONST),
876 SD_BUS_PROPERTY("UnitFileState", "s", property_get_unit_file_state, 0, 0),
877 SD_BUS_PROPERTY("UnitFilePreset", "s", property_get_unit_file_preset, 0, 0),
878 BUS_PROPERTY_DUAL_TIMESTAMP("StateChangeTimestamp", offsetof(Unit, state_change_timestamp), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
879 BUS_PROPERTY_DUAL_TIMESTAMP("InactiveExitTimestamp", offsetof(Unit, inactive_exit_timestamp), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
880 BUS_PROPERTY_DUAL_TIMESTAMP("ActiveEnterTimestamp", offsetof(Unit, active_enter_timestamp), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
881 BUS_PROPERTY_DUAL_TIMESTAMP("ActiveExitTimestamp", offsetof(Unit, active_exit_timestamp), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
882 BUS_PROPERTY_DUAL_TIMESTAMP("InactiveEnterTimestamp", offsetof(Unit, inactive_enter_timestamp), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
883 SD_BUS_PROPERTY("CanStart", "b", property_get_can_start, 0, SD_BUS_VTABLE_PROPERTY_CONST),
884 SD_BUS_PROPERTY("CanStop", "b", property_get_can_stop, 0, SD_BUS_VTABLE_PROPERTY_CONST),
885 SD_BUS_PROPERTY("CanReload", "b", property_get_can_reload, 0, SD_BUS_VTABLE_PROPERTY_CONST),
886 SD_BUS_PROPERTY("CanIsolate", "b", property_get_can_isolate, 0, SD_BUS_VTABLE_PROPERTY_CONST),
887 SD_BUS_PROPERTY("CanClean", "as", property_get_can_clean, 0, SD_BUS_VTABLE_PROPERTY_CONST),
888 SD_BUS_PROPERTY("CanFreeze", "b", property_get_can_freeze, 0, SD_BUS_VTABLE_PROPERTY_CONST),
889 SD_BUS_PROPERTY("Job", "(uo)", property_get_job, offsetof(Unit, job), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
890 SD_BUS_PROPERTY("StopWhenUnneeded", "b", bus_property_get_bool, offsetof(Unit, stop_when_unneeded), SD_BUS_VTABLE_PROPERTY_CONST),
891 SD_BUS_PROPERTY("RefuseManualStart", "b", bus_property_get_bool, offsetof(Unit, refuse_manual_start), SD_BUS_VTABLE_PROPERTY_CONST),
892 SD_BUS_PROPERTY("RefuseManualStop", "b", bus_property_get_bool, offsetof(Unit, refuse_manual_stop), SD_BUS_VTABLE_PROPERTY_CONST),
893 SD_BUS_PROPERTY("AllowIsolate", "b", bus_property_get_bool, offsetof(Unit, allow_isolate), SD_BUS_VTABLE_PROPERTY_CONST),
894 SD_BUS_PROPERTY("DefaultDependencies", "b", bus_property_get_bool, offsetof(Unit, default_dependencies), SD_BUS_VTABLE_PROPERTY_CONST),
895 SD_BUS_PROPERTY("OnFailureJobMode", "s", property_get_job_mode, offsetof(Unit, on_failure_job_mode), SD_BUS_VTABLE_PROPERTY_CONST),
896 SD_BUS_PROPERTY("IgnoreOnIsolate", "b", bus_property_get_bool, offsetof(Unit, ignore_on_isolate), SD_BUS_VTABLE_PROPERTY_CONST),
897 SD_BUS_PROPERTY("NeedDaemonReload", "b", property_get_need_daemon_reload, 0, SD_BUS_VTABLE_PROPERTY_CONST),
898 SD_BUS_PROPERTY("JobTimeoutUSec", "t", bus_property_get_usec, offsetof(Unit, job_timeout), SD_BUS_VTABLE_PROPERTY_CONST),
899 SD_BUS_PROPERTY("JobRunningTimeoutUSec", "t", bus_property_get_usec, offsetof(Unit, job_running_timeout), SD_BUS_VTABLE_PROPERTY_CONST),
900 SD_BUS_PROPERTY("JobTimeoutAction", "s", property_get_emergency_action, offsetof(Unit, job_timeout_action), SD_BUS_VTABLE_PROPERTY_CONST),
901 SD_BUS_PROPERTY("JobTimeoutRebootArgument", "s", NULL, offsetof(Unit, job_timeout_reboot_arg), SD_BUS_VTABLE_PROPERTY_CONST),
902 SD_BUS_PROPERTY("ConditionResult", "b", bus_property_get_bool, offsetof(Unit, condition_result), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
903 SD_BUS_PROPERTY("AssertResult", "b", bus_property_get_bool, offsetof(Unit, assert_result), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
904 BUS_PROPERTY_DUAL_TIMESTAMP("ConditionTimestamp", offsetof(Unit, condition_timestamp), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
905 BUS_PROPERTY_DUAL_TIMESTAMP("AssertTimestamp", offsetof(Unit, assert_timestamp), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
906 SD_BUS_PROPERTY("Conditions", "a(sbbsi)", property_get_conditions, offsetof(Unit, conditions), SD_BUS_VTABLE_PROPERTY_EMITS_INVALIDATION),
907 SD_BUS_PROPERTY("Asserts", "a(sbbsi)", property_get_conditions, offsetof(Unit, asserts), SD_BUS_VTABLE_PROPERTY_EMITS_INVALIDATION),
908 SD_BUS_PROPERTY("LoadError", "(ss)", property_get_load_error, 0, SD_BUS_VTABLE_PROPERTY_CONST),
909 SD_BUS_PROPERTY("Transient", "b", bus_property_get_bool, offsetof(Unit, transient), SD_BUS_VTABLE_PROPERTY_CONST),
910 SD_BUS_PROPERTY("Perpetual", "b", bus_property_get_bool, offsetof(Unit, perpetual), SD_BUS_VTABLE_PROPERTY_CONST),
911 SD_BUS_PROPERTY("StartLimitIntervalUSec", "t", bus_property_get_usec, offsetof(Unit, start_ratelimit.interval), SD_BUS_VTABLE_PROPERTY_CONST),
912 SD_BUS_PROPERTY("StartLimitBurst", "u", bus_property_get_unsigned, offsetof(Unit, start_ratelimit.burst), SD_BUS_VTABLE_PROPERTY_CONST),
913 SD_BUS_PROPERTY("StartLimitAction", "s", property_get_emergency_action, offsetof(Unit, start_limit_action), SD_BUS_VTABLE_PROPERTY_CONST),
914 SD_BUS_PROPERTY("FailureAction", "s", property_get_emergency_action, offsetof(Unit, failure_action), SD_BUS_VTABLE_PROPERTY_CONST),
915 SD_BUS_PROPERTY("FailureActionExitStatus", "i", bus_property_get_int, offsetof(Unit, failure_action_exit_status), SD_BUS_VTABLE_PROPERTY_CONST),
916 SD_BUS_PROPERTY("SuccessAction", "s", property_get_emergency_action, offsetof(Unit, success_action), SD_BUS_VTABLE_PROPERTY_CONST),
917 SD_BUS_PROPERTY("SuccessActionExitStatus", "i", bus_property_get_int, offsetof(Unit, success_action_exit_status), SD_BUS_VTABLE_PROPERTY_CONST),
918 SD_BUS_PROPERTY("RebootArgument", "s", NULL, offsetof(Unit, reboot_arg), SD_BUS_VTABLE_PROPERTY_CONST),
919 SD_BUS_PROPERTY("InvocationID", "ay", bus_property_get_id128, offsetof(Unit, invocation_id), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
920 SD_BUS_PROPERTY("CollectMode", "s", property_get_collect_mode, offsetof(Unit, collect_mode), SD_BUS_VTABLE_PROPERTY_CONST),
921 SD_BUS_PROPERTY("Refs", "as", property_get_refs, 0, 0),
922
923 SD_BUS_METHOD_WITH_NAMES("Start",
924 "s",
925 SD_BUS_PARAM(mode),
926 "o",
927 SD_BUS_PARAM(job),
928 method_start,
929 SD_BUS_VTABLE_UNPRIVILEGED),
930 SD_BUS_METHOD_WITH_NAMES("Stop",
931 "s",
932 SD_BUS_PARAM(mode),
933 "o",
934 SD_BUS_PARAM(job),
935 method_stop,
936 SD_BUS_VTABLE_UNPRIVILEGED),
937 SD_BUS_METHOD_WITH_NAMES("Reload",
938 "s",
939 SD_BUS_PARAM(mode),
940 "o",
941 SD_BUS_PARAM(job),
942 method_reload,
943 SD_BUS_VTABLE_UNPRIVILEGED),
944 SD_BUS_METHOD_WITH_NAMES("Restart",
945 "s",
946 SD_BUS_PARAM(mode),
947 "o",
948 SD_BUS_PARAM(job),
949 method_restart,
950 SD_BUS_VTABLE_UNPRIVILEGED),
951 SD_BUS_METHOD_WITH_NAMES("TryRestart",
952 "s",
953 SD_BUS_PARAM(mode),
954 "o",
955 SD_BUS_PARAM(job),
956 method_try_restart,
957 SD_BUS_VTABLE_UNPRIVILEGED),
958 SD_BUS_METHOD_WITH_NAMES("ReloadOrRestart",
959 "s",
960 SD_BUS_PARAM(mode),
961 "o",
962 SD_BUS_PARAM(job),
963 method_reload_or_restart,
964 SD_BUS_VTABLE_UNPRIVILEGED),
965 SD_BUS_METHOD_WITH_NAMES("ReloadOrTryRestart",
966 "s",
967 SD_BUS_PARAM(mode),
968 "o",
969 SD_BUS_PARAM(job),
970 method_reload_or_try_restart,
971 SD_BUS_VTABLE_UNPRIVILEGED),
972 SD_BUS_METHOD_WITH_NAMES("EnqueueJob",
973 "ss",
974 SD_BUS_PARAM(job_type)
975 SD_BUS_PARAM(job_mode),
976 "uososa(uosos)",
977 SD_BUS_PARAM(job_id)
978 SD_BUS_PARAM(job_path)
979 SD_BUS_PARAM(unit_id)
980 SD_BUS_PARAM(unit_path)
981 SD_BUS_PARAM(job_type)
982 SD_BUS_PARAM(affected_jobs),
983 bus_unit_method_enqueue_job,
984 SD_BUS_VTABLE_UNPRIVILEGED),
985 SD_BUS_METHOD_WITH_NAMES("Kill",
986 "si",
987 SD_BUS_PARAM(whom)
988 SD_BUS_PARAM(signal),
989 NULL,,
990 bus_unit_method_kill,
991 SD_BUS_VTABLE_UNPRIVILEGED),
992 SD_BUS_METHOD("ResetFailed",
993 NULL,
994 NULL,
995 bus_unit_method_reset_failed,
996 SD_BUS_VTABLE_UNPRIVILEGED),
997 SD_BUS_METHOD_WITH_NAMES("SetProperties",
998 "ba(sv)",
999 SD_BUS_PARAM(runtime)
1000 SD_BUS_PARAM(properties),
1001 NULL,,
1002 bus_unit_method_set_properties,
1003 SD_BUS_VTABLE_UNPRIVILEGED),
1004 SD_BUS_METHOD("Ref",
1005 NULL,
1006 NULL,
1007 bus_unit_method_ref,
1008 SD_BUS_VTABLE_UNPRIVILEGED),
1009 SD_BUS_METHOD("Unref",
1010 NULL,
1011 NULL,
1012 bus_unit_method_unref,
1013 SD_BUS_VTABLE_UNPRIVILEGED),
1014 SD_BUS_METHOD_WITH_NAMES("Clean",
1015 "as",
1016 SD_BUS_PARAM(mask),
1017 NULL,,
1018 bus_unit_method_clean,
1019 SD_BUS_VTABLE_UNPRIVILEGED),
1020 SD_BUS_METHOD("Freeze",
1021 NULL,
1022 NULL,
1023 bus_unit_method_freeze,
1024 SD_BUS_VTABLE_UNPRIVILEGED),
1025 SD_BUS_METHOD("Thaw",
1026 NULL,
1027 NULL,
1028 bus_unit_method_thaw,
1029 SD_BUS_VTABLE_UNPRIVILEGED),
1030
1031 /* For dependency types we don't support anymore always return an empty array */
1032 SD_BUS_PROPERTY("RequiresOverridable", "as", property_get_empty_strv, 0, SD_BUS_VTABLE_HIDDEN),
1033 SD_BUS_PROPERTY("RequisiteOverridable", "as", property_get_empty_strv, 0, SD_BUS_VTABLE_HIDDEN),
1034 SD_BUS_PROPERTY("RequiredByOverridable", "as", property_get_empty_strv, 0, SD_BUS_VTABLE_HIDDEN),
1035 SD_BUS_PROPERTY("RequisiteOfOverridable", "as", property_get_empty_strv, 0, SD_BUS_VTABLE_HIDDEN),
1036 /* Obsolete alias names */
1037 SD_BUS_PROPERTY("StartLimitInterval", "t", bus_property_get_usec, offsetof(Unit, start_ratelimit.interval), SD_BUS_VTABLE_PROPERTY_CONST|SD_BUS_VTABLE_HIDDEN),
1038 SD_BUS_PROPERTY("StartLimitIntervalSec", "t", bus_property_get_usec, offsetof(Unit, start_ratelimit.interval), SD_BUS_VTABLE_PROPERTY_CONST|SD_BUS_VTABLE_HIDDEN),
1039
1040 SD_BUS_VTABLE_END
1041 };
1042
1043 static int property_get_slice(
1044 sd_bus *bus,
1045 const char *path,
1046 const char *interface,
1047 const char *property,
1048 sd_bus_message *reply,
1049 void *userdata,
1050 sd_bus_error *error) {
1051
1052 Unit *u = userdata;
1053
1054 assert(bus);
1055 assert(reply);
1056 assert(u);
1057
1058 return sd_bus_message_append(reply, "s", unit_slice_name(u));
1059 }
1060
1061 static int property_get_current_memory(
1062 sd_bus *bus,
1063 const char *path,
1064 const char *interface,
1065 const char *property,
1066 sd_bus_message *reply,
1067 void *userdata,
1068 sd_bus_error *error) {
1069
1070 uint64_t sz = (uint64_t) -1;
1071 Unit *u = userdata;
1072 int r;
1073
1074 assert(bus);
1075 assert(reply);
1076 assert(u);
1077
1078 r = unit_get_memory_current(u, &sz);
1079 if (r < 0 && r != -ENODATA)
1080 log_unit_warning_errno(u, r, "Failed to get memory.usage_in_bytes attribute: %m");
1081
1082 return sd_bus_message_append(reply, "t", sz);
1083 }
1084
1085 static int property_get_current_tasks(
1086 sd_bus *bus,
1087 const char *path,
1088 const char *interface,
1089 const char *property,
1090 sd_bus_message *reply,
1091 void *userdata,
1092 sd_bus_error *error) {
1093
1094 uint64_t cn = (uint64_t) -1;
1095 Unit *u = userdata;
1096 int r;
1097
1098 assert(bus);
1099 assert(reply);
1100 assert(u);
1101
1102 r = unit_get_tasks_current(u, &cn);
1103 if (r < 0 && r != -ENODATA)
1104 log_unit_warning_errno(u, r, "Failed to get pids.current attribute: %m");
1105
1106 return sd_bus_message_append(reply, "t", cn);
1107 }
1108
1109 static int property_get_cpu_usage(
1110 sd_bus *bus,
1111 const char *path,
1112 const char *interface,
1113 const char *property,
1114 sd_bus_message *reply,
1115 void *userdata,
1116 sd_bus_error *error) {
1117
1118 nsec_t ns = (nsec_t) -1;
1119 Unit *u = userdata;
1120 int r;
1121
1122 assert(bus);
1123 assert(reply);
1124 assert(u);
1125
1126 r = unit_get_cpu_usage(u, &ns);
1127 if (r < 0 && r != -ENODATA)
1128 log_unit_warning_errno(u, r, "Failed to get cpuacct.usage attribute: %m");
1129
1130 return sd_bus_message_append(reply, "t", ns);
1131 }
1132
1133 static int property_get_cpuset_cpus(
1134 sd_bus *bus,
1135 const char *path,
1136 const char *interface,
1137 const char *property,
1138 sd_bus_message *reply,
1139 void *userdata,
1140 sd_bus_error *error) {
1141
1142 Unit *u = userdata;
1143 _cleanup_(cpu_set_reset) CPUSet cpus = {};
1144 _cleanup_free_ uint8_t *array = NULL;
1145 size_t allocated;
1146
1147 assert(bus);
1148 assert(reply);
1149 assert(u);
1150
1151 (void) unit_get_cpuset(u, &cpus, "cpuset.cpus.effective");
1152 (void) cpu_set_to_dbus(&cpus, &array, &allocated);
1153 return sd_bus_message_append_array(reply, 'y', array, allocated);
1154 }
1155
1156 static int property_get_cpuset_mems(
1157 sd_bus *bus,
1158 const char *path,
1159 const char *interface,
1160 const char *property,
1161 sd_bus_message *reply,
1162 void *userdata,
1163 sd_bus_error *error) {
1164
1165 Unit *u = userdata;
1166 _cleanup_(cpu_set_reset) CPUSet mems = {};
1167 _cleanup_free_ uint8_t *array = NULL;
1168 size_t allocated;
1169
1170 assert(bus);
1171 assert(reply);
1172 assert(u);
1173
1174 (void) unit_get_cpuset(u, &mems, "cpuset.mems.effective");
1175 (void) cpu_set_to_dbus(&mems, &array, &allocated);
1176 return sd_bus_message_append_array(reply, 'y', array, allocated);
1177 }
1178
1179 static int property_get_cgroup(
1180 sd_bus *bus,
1181 const char *path,
1182 const char *interface,
1183 const char *property,
1184 sd_bus_message *reply,
1185 void *userdata,
1186 sd_bus_error *error) {
1187
1188 Unit *u = userdata;
1189 const char *t = NULL;
1190
1191 assert(bus);
1192 assert(reply);
1193 assert(u);
1194
1195 /* Three cases: a) u->cgroup_path is NULL, in which case the
1196 * unit has no control group, which we report as the empty
1197 * string. b) u->cgroup_path is the empty string, which
1198 * indicates the root cgroup, which we report as "/". c) all
1199 * other cases we report as-is. */
1200
1201 if (u->cgroup_path)
1202 t = empty_to_root(u->cgroup_path);
1203
1204 return sd_bus_message_append(reply, "s", t);
1205 }
1206
1207 static int append_process(sd_bus_message *reply, const char *p, pid_t pid, Set *pids) {
1208 _cleanup_free_ char *buf = NULL, *cmdline = NULL;
1209 int r;
1210
1211 assert(reply);
1212 assert(pid > 0);
1213
1214 r = set_put(pids, PID_TO_PTR(pid));
1215 if (IN_SET(r, 0, -EEXIST))
1216 return 0;
1217 if (r < 0)
1218 return r;
1219
1220 if (!p) {
1221 r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, pid, &buf);
1222 if (r == -ESRCH)
1223 return 0;
1224 if (r < 0)
1225 return r;
1226
1227 p = buf;
1228 }
1229
1230 (void) get_process_cmdline(pid, SIZE_MAX, PROCESS_CMDLINE_COMM_FALLBACK, &cmdline);
1231
1232 return sd_bus_message_append(reply,
1233 "(sus)",
1234 p,
1235 (uint32_t) pid,
1236 cmdline);
1237 }
1238
1239 static int append_cgroup(sd_bus_message *reply, const char *p, Set *pids) {
1240 _cleanup_closedir_ DIR *d = NULL;
1241 _cleanup_fclose_ FILE *f = NULL;
1242 int r;
1243
1244 assert(reply);
1245 assert(p);
1246
1247 r = cg_enumerate_processes(SYSTEMD_CGROUP_CONTROLLER, p, &f);
1248 if (r == -ENOENT)
1249 return 0;
1250 if (r < 0)
1251 return r;
1252
1253 for (;;) {
1254 pid_t pid;
1255
1256 r = cg_read_pid(f, &pid);
1257 if (r < 0)
1258 return r;
1259 if (r == 0)
1260 break;
1261
1262 if (is_kernel_thread(pid) > 0)
1263 continue;
1264
1265 r = append_process(reply, p, pid, pids);
1266 if (r < 0)
1267 return r;
1268 }
1269
1270 r = cg_enumerate_subgroups(SYSTEMD_CGROUP_CONTROLLER, p, &d);
1271 if (r == -ENOENT)
1272 return 0;
1273 if (r < 0)
1274 return r;
1275
1276 for (;;) {
1277 _cleanup_free_ char *g = NULL, *j = NULL;
1278
1279 r = cg_read_subgroup(d, &g);
1280 if (r < 0)
1281 return r;
1282 if (r == 0)
1283 break;
1284
1285 j = path_join(empty_to_root(p), g);
1286 if (!j)
1287 return -ENOMEM;
1288
1289 r = append_cgroup(reply, j, pids);
1290 if (r < 0)
1291 return r;
1292 }
1293
1294 return 0;
1295 }
1296
1297 int bus_unit_method_get_processes(sd_bus_message *message, void *userdata, sd_bus_error *error) {
1298 _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
1299 _cleanup_set_free_ Set *pids = NULL;
1300 Unit *u = userdata;
1301 pid_t pid;
1302 int r;
1303
1304 assert(message);
1305
1306 r = mac_selinux_unit_access_check(u, message, "status", error);
1307 if (r < 0)
1308 return r;
1309
1310 pids = set_new(NULL);
1311 if (!pids)
1312 return -ENOMEM;
1313
1314 r = sd_bus_message_new_method_return(message, &reply);
1315 if (r < 0)
1316 return r;
1317
1318 r = sd_bus_message_open_container(reply, 'a', "(sus)");
1319 if (r < 0)
1320 return r;
1321
1322 if (u->cgroup_path) {
1323 r = append_cgroup(reply, u->cgroup_path, pids);
1324 if (r < 0)
1325 return r;
1326 }
1327
1328 /* The main and control pids might live outside of the cgroup, hence fetch them separately */
1329 pid = unit_main_pid(u);
1330 if (pid > 0) {
1331 r = append_process(reply, NULL, pid, pids);
1332 if (r < 0)
1333 return r;
1334 }
1335
1336 pid = unit_control_pid(u);
1337 if (pid > 0) {
1338 r = append_process(reply, NULL, pid, pids);
1339 if (r < 0)
1340 return r;
1341 }
1342
1343 r = sd_bus_message_close_container(reply);
1344 if (r < 0)
1345 return r;
1346
1347 return sd_bus_send(NULL, reply, NULL);
1348 }
1349
1350 static int property_get_ip_counter(
1351 sd_bus *bus,
1352 const char *path,
1353 const char *interface,
1354 const char *property,
1355 sd_bus_message *reply,
1356 void *userdata,
1357 sd_bus_error *error) {
1358
1359 static const char *const table[_CGROUP_IP_ACCOUNTING_METRIC_MAX] = {
1360 [CGROUP_IP_INGRESS_BYTES] = "IPIngressBytes",
1361 [CGROUP_IP_EGRESS_BYTES] = "IPEgressBytes",
1362 [CGROUP_IP_INGRESS_PACKETS] = "IPIngressPackets",
1363 [CGROUP_IP_EGRESS_PACKETS] = "IPEgressPackets",
1364 };
1365
1366 uint64_t value = UINT64_MAX;
1367 Unit *u = userdata;
1368 ssize_t metric;
1369
1370 assert(bus);
1371 assert(reply);
1372 assert(property);
1373 assert(u);
1374
1375 assert_se((metric = string_table_lookup(table, ELEMENTSOF(table), property)) >= 0);
1376 (void) unit_get_ip_accounting(u, metric, &value);
1377 return sd_bus_message_append(reply, "t", value);
1378 }
1379
1380 static int property_get_io_counter(
1381 sd_bus *bus,
1382 const char *path,
1383 const char *interface,
1384 const char *property,
1385 sd_bus_message *reply,
1386 void *userdata,
1387 sd_bus_error *error) {
1388
1389 static const char *const table[_CGROUP_IO_ACCOUNTING_METRIC_MAX] = {
1390 [CGROUP_IO_READ_BYTES] = "IOReadBytes",
1391 [CGROUP_IO_WRITE_BYTES] = "IOWriteBytes",
1392 [CGROUP_IO_READ_OPERATIONS] = "IOReadOperations",
1393 [CGROUP_IO_WRITE_OPERATIONS] = "IOWriteOperations",
1394 };
1395
1396 uint64_t value = UINT64_MAX;
1397 Unit *u = userdata;
1398 ssize_t metric;
1399
1400 assert(bus);
1401 assert(reply);
1402 assert(property);
1403 assert(u);
1404
1405 assert_se((metric = string_table_lookup(table, ELEMENTSOF(table), property)) >= 0);
1406 (void) unit_get_io_accounting(u, metric, false, &value);
1407 return sd_bus_message_append(reply, "t", value);
1408 }
1409
1410 int bus_unit_method_attach_processes(sd_bus_message *message, void *userdata, sd_bus_error *error) {
1411
1412 _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
1413 _cleanup_set_free_ Set *pids = NULL;
1414 Unit *u = userdata;
1415 const char *path;
1416 int r;
1417
1418 assert(message);
1419
1420 /* This migrates the processes with the specified PIDs into the cgroup of this unit, optionally below a
1421 * specified cgroup path. Obviously this only works for units that actually maintain a cgroup
1422 * representation. If a process is already in the cgroup no operation is executed – in this case the specified
1423 * subcgroup path has no effect! */
1424
1425 r = mac_selinux_unit_access_check(u, message, "start", error);
1426 if (r < 0)
1427 return r;
1428
1429 r = sd_bus_message_read(message, "s", &path);
1430 if (r < 0)
1431 return r;
1432
1433 path = empty_to_null(path);
1434 if (path) {
1435 if (!path_is_absolute(path))
1436 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Control group path is not absolute: %s", path);
1437
1438 if (!path_is_normalized(path))
1439 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Control group path is not normalized: %s", path);
1440 }
1441
1442 if (!unit_cgroup_delegate(u))
1443 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Process migration not available on non-delegated units.");
1444
1445 if (UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(u)))
1446 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Unit is not active, refusing.");
1447
1448 r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_EUID|SD_BUS_CREDS_PID, &creds);
1449 if (r < 0)
1450 return r;
1451
1452 r = sd_bus_message_enter_container(message, 'a', "u");
1453 if (r < 0)
1454 return r;
1455 for (;;) {
1456 uid_t process_uid, sender_uid;
1457 uint32_t upid;
1458 pid_t pid;
1459
1460 r = sd_bus_message_read(message, "u", &upid);
1461 if (r < 0)
1462 return r;
1463 if (r == 0)
1464 break;
1465
1466 if (upid == 0) {
1467 r = sd_bus_creds_get_pid(creds, &pid);
1468 if (r < 0)
1469 return r;
1470 } else
1471 pid = (uid_t) upid;
1472
1473 /* Filter out duplicates */
1474 if (set_contains(pids, PID_TO_PTR(pid)))
1475 continue;
1476
1477 /* Check if this process is suitable for attaching to this unit */
1478 r = unit_pid_attachable(u, pid, error);
1479 if (r < 0)
1480 return r;
1481
1482 /* Let's query the sender's UID, so that we can make our security decisions */
1483 r = sd_bus_creds_get_euid(creds, &sender_uid);
1484 if (r < 0)
1485 return r;
1486
1487 /* Let's validate security: if the sender is root, then all is OK. If the sender is any other unit,
1488 * then the process' UID and the target unit's UID have to match the sender's UID */
1489 if (sender_uid != 0 && sender_uid != getuid()) {
1490 r = get_process_uid(pid, &process_uid);
1491 if (r < 0)
1492 return sd_bus_error_set_errnof(error, r, "Failed to retrieve process UID: %m");
1493
1494 if (process_uid != sender_uid)
1495 return sd_bus_error_setf(error, SD_BUS_ERROR_ACCESS_DENIED, "Process " PID_FMT " not owned by client's UID. Refusing.", pid);
1496 if (process_uid != u->ref_uid)
1497 return sd_bus_error_setf(error, SD_BUS_ERROR_ACCESS_DENIED, "Process " PID_FMT " not owned by target unit's UID. Refusing.", pid);
1498 }
1499
1500 if (!pids) {
1501 pids = set_new(NULL);
1502 if (!pids)
1503 return -ENOMEM;
1504 }
1505
1506 r = set_put(pids, PID_TO_PTR(pid));
1507 if (r < 0)
1508 return r;
1509 }
1510
1511 r = sd_bus_message_exit_container(message);
1512 if (r < 0)
1513 return r;
1514
1515 r = unit_attach_pids_to_cgroup(u, pids, path);
1516 if (r < 0)
1517 return sd_bus_error_set_errnof(error, r, "Failed to attach processes to control group: %m");
1518
1519 return sd_bus_reply_method_return(message, NULL);
1520 }
1521
1522 const sd_bus_vtable bus_unit_cgroup_vtable[] = {
1523 SD_BUS_VTABLE_START(0),
1524 SD_BUS_PROPERTY("Slice", "s", property_get_slice, 0, 0),
1525 SD_BUS_PROPERTY("ControlGroup", "s", property_get_cgroup, 0, 0),
1526 SD_BUS_PROPERTY("MemoryCurrent", "t", property_get_current_memory, 0, 0),
1527 SD_BUS_PROPERTY("CPUUsageNSec", "t", property_get_cpu_usage, 0, 0),
1528 SD_BUS_PROPERTY("EffectiveCPUs", "ay", property_get_cpuset_cpus, 0, 0),
1529 SD_BUS_PROPERTY("EffectiveMemoryNodes", "ay", property_get_cpuset_mems, 0, 0),
1530 SD_BUS_PROPERTY("TasksCurrent", "t", property_get_current_tasks, 0, 0),
1531 SD_BUS_PROPERTY("IPIngressBytes", "t", property_get_ip_counter, 0, 0),
1532 SD_BUS_PROPERTY("IPIngressPackets", "t", property_get_ip_counter, 0, 0),
1533 SD_BUS_PROPERTY("IPEgressBytes", "t", property_get_ip_counter, 0, 0),
1534 SD_BUS_PROPERTY("IPEgressPackets", "t", property_get_ip_counter, 0, 0),
1535 SD_BUS_PROPERTY("IOReadBytes", "t", property_get_io_counter, 0, 0),
1536 SD_BUS_PROPERTY("IOReadOperations", "t", property_get_io_counter, 0, 0),
1537 SD_BUS_PROPERTY("IOWriteBytes", "t", property_get_io_counter, 0, 0),
1538 SD_BUS_PROPERTY("IOWriteOperations", "t", property_get_io_counter, 0, 0),
1539
1540 SD_BUS_METHOD_WITH_NAMES("GetProcesses",
1541 NULL,,
1542 "a(sus)",
1543 SD_BUS_PARAM(processes),
1544 bus_unit_method_get_processes,
1545 SD_BUS_VTABLE_UNPRIVILEGED),
1546
1547 SD_BUS_METHOD_WITH_NAMES("AttachProcesses",
1548 "sau",
1549 SD_BUS_PARAM(subcgroup)
1550 SD_BUS_PARAM(pids),
1551 NULL,,
1552 bus_unit_method_attach_processes,
1553 SD_BUS_VTABLE_UNPRIVILEGED),
1554
1555 SD_BUS_VTABLE_END
1556 };
1557
1558 static int send_new_signal(sd_bus *bus, void *userdata) {
1559 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
1560 _cleanup_free_ char *p = NULL;
1561 Unit *u = userdata;
1562 int r;
1563
1564 assert(bus);
1565 assert(u);
1566
1567 p = unit_dbus_path(u);
1568 if (!p)
1569 return -ENOMEM;
1570
1571 r = sd_bus_message_new_signal(
1572 bus,
1573 &m,
1574 "/org/freedesktop/systemd1",
1575 "org.freedesktop.systemd1.Manager",
1576 "UnitNew");
1577 if (r < 0)
1578 return r;
1579
1580 r = sd_bus_message_append(m, "so", u->id, p);
1581 if (r < 0)
1582 return r;
1583
1584 return sd_bus_send(bus, m, NULL);
1585 }
1586
1587 static int send_changed_signal(sd_bus *bus, void *userdata) {
1588 _cleanup_free_ char *p = NULL;
1589 Unit *u = userdata;
1590 int r;
1591
1592 assert(bus);
1593 assert(u);
1594
1595 p = unit_dbus_path(u);
1596 if (!p)
1597 return -ENOMEM;
1598
1599 /* Send a properties changed signal. First for the specific
1600 * type, then for the generic unit. The clients may rely on
1601 * this order to get atomic behavior if needed. */
1602
1603 r = sd_bus_emit_properties_changed_strv(
1604 bus, p,
1605 unit_dbus_interface_from_type(u->type),
1606 NULL);
1607 if (r < 0)
1608 return r;
1609
1610 return sd_bus_emit_properties_changed_strv(
1611 bus, p,
1612 "org.freedesktop.systemd1.Unit",
1613 NULL);
1614 }
1615
1616 void bus_unit_send_change_signal(Unit *u) {
1617 int r;
1618 assert(u);
1619
1620 if (u->in_dbus_queue) {
1621 LIST_REMOVE(dbus_queue, u->manager->dbus_unit_queue, u);
1622 u->in_dbus_queue = false;
1623 }
1624
1625 if (!u->id)
1626 return;
1627
1628 r = bus_foreach_bus(u->manager, u->bus_track, u->sent_dbus_new_signal ? send_changed_signal : send_new_signal, u);
1629 if (r < 0)
1630 log_unit_debug_errno(u, r, "Failed to send unit change signal for %s: %m", u->id);
1631
1632 u->sent_dbus_new_signal = true;
1633 }
1634
1635 void bus_unit_send_pending_change_signal(Unit *u, bool including_new) {
1636
1637 /* Sends out any pending change signals, but only if they really are pending. This call is used when we are
1638 * about to change state in order to force out a PropertiesChanged signal beforehand if there was one pending
1639 * so that clients can follow the full state transition */
1640
1641 if (!u->in_dbus_queue) /* If not enqueued, don't bother */
1642 return;
1643
1644 if (!u->sent_dbus_new_signal && !including_new) /* If the unit was never announced, don't bother, it's fine if
1645 * the unit appears in the new state right-away (except if the
1646 * caller explicitly asked us to send it anyway) */
1647 return;
1648
1649 if (MANAGER_IS_RELOADING(u->manager)) /* Don't generate unnecessary PropertiesChanged signals for the same unit
1650 * when we are reloading. */
1651 return;
1652
1653 bus_unit_send_change_signal(u);
1654 }
1655
1656 int bus_unit_send_pending_freezer_message(Unit *u) {
1657 int r;
1658
1659 assert(u);
1660
1661 if (!u->pending_freezer_message)
1662 return 0;
1663
1664 r = sd_bus_send(NULL, u->pending_freezer_message, NULL);
1665 if (r < 0)
1666 log_warning_errno(r, "Failed to send queued message, ignoring: %m");
1667
1668 u->pending_freezer_message = sd_bus_message_unref(u->pending_freezer_message);
1669
1670 return 0;
1671 }
1672
1673 static int send_removed_signal(sd_bus *bus, void *userdata) {
1674 _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
1675 _cleanup_free_ char *p = NULL;
1676 Unit *u = userdata;
1677 int r;
1678
1679 assert(bus);
1680 assert(u);
1681
1682 p = unit_dbus_path(u);
1683 if (!p)
1684 return -ENOMEM;
1685
1686 r = sd_bus_message_new_signal(
1687 bus,
1688 &m,
1689 "/org/freedesktop/systemd1",
1690 "org.freedesktop.systemd1.Manager",
1691 "UnitRemoved");
1692 if (r < 0)
1693 return r;
1694
1695 r = sd_bus_message_append(m, "so", u->id, p);
1696 if (r < 0)
1697 return r;
1698
1699 return sd_bus_send(bus, m, NULL);
1700 }
1701
1702 void bus_unit_send_removed_signal(Unit *u) {
1703 int r;
1704 assert(u);
1705
1706 if (!u->sent_dbus_new_signal || u->in_dbus_queue)
1707 bus_unit_send_change_signal(u);
1708
1709 if (!u->id)
1710 return;
1711
1712 r = bus_foreach_bus(u->manager, u->bus_track, send_removed_signal, u);
1713 if (r < 0)
1714 log_unit_debug_errno(u, r, "Failed to send unit remove signal for %s: %m", u->id);
1715 }
1716
1717 int bus_unit_queue_job(
1718 sd_bus_message *message,
1719 Unit *u,
1720 JobType type,
1721 JobMode mode,
1722 BusUnitQueueFlags flags,
1723 sd_bus_error *error) {
1724
1725 _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
1726 _cleanup_free_ char *job_path = NULL, *unit_path = NULL;
1727 _cleanup_set_free_ Set *affected = NULL;
1728 Iterator i;
1729 Job *j, *a;
1730 int r;
1731
1732 assert(message);
1733 assert(u);
1734 assert(type >= 0 && type < _JOB_TYPE_MAX);
1735 assert(mode >= 0 && mode < _JOB_MODE_MAX);
1736
1737 r = mac_selinux_unit_access_check(
1738 u, message,
1739 job_type_to_access_method(type),
1740 error);
1741 if (r < 0)
1742 return r;
1743
1744 if (FLAGS_SET(flags, BUS_UNIT_QUEUE_RELOAD_IF_POSSIBLE) && unit_can_reload(u)) {
1745 if (type == JOB_RESTART)
1746 type = JOB_RELOAD_OR_START;
1747 else if (type == JOB_TRY_RESTART)
1748 type = JOB_TRY_RELOAD;
1749 }
1750
1751 if (type == JOB_STOP &&
1752 IN_SET(u->load_state, UNIT_NOT_FOUND, UNIT_ERROR, UNIT_BAD_SETTING) &&
1753 unit_active_state(u) == UNIT_INACTIVE)
1754 return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_UNIT, "Unit %s not loaded.", u->id);
1755
1756 if ((type == JOB_START && u->refuse_manual_start) ||
1757 (type == JOB_STOP && u->refuse_manual_stop) ||
1758 (IN_SET(type, JOB_RESTART, JOB_TRY_RESTART) && (u->refuse_manual_start || u->refuse_manual_stop)) ||
1759 (type == JOB_RELOAD_OR_START && job_type_collapse(type, u) == JOB_START && u->refuse_manual_start))
1760 return sd_bus_error_setf(error, BUS_ERROR_ONLY_BY_DEPENDENCY, "Operation refused, unit %s may be requested by dependency only (it is configured to refuse manual start/stop).", u->id);
1761
1762 if (FLAGS_SET(flags, BUS_UNIT_QUEUE_VERBOSE_REPLY)) {
1763 affected = set_new(NULL);
1764 if (!affected)
1765 return -ENOMEM;
1766 }
1767
1768 r = manager_add_job(u->manager, type, u, mode, affected, error, &j);
1769 if (r < 0)
1770 return r;
1771
1772 r = bus_job_track_sender(j, message);
1773 if (r < 0)
1774 return r;
1775
1776 /* Before we send the method reply, force out the announcement JobNew for this job */
1777 bus_job_send_pending_change_signal(j, true);
1778
1779 job_path = job_dbus_path(j);
1780 if (!job_path)
1781 return -ENOMEM;
1782
1783 /* The classic response is just a job object path */
1784 if (!FLAGS_SET(flags, BUS_UNIT_QUEUE_VERBOSE_REPLY))
1785 return sd_bus_reply_method_return(message, "o", job_path);
1786
1787 /* In verbose mode respond with the anchor job plus everything that has been affected */
1788 r = sd_bus_message_new_method_return(message, &reply);
1789 if (r < 0)
1790 return r;
1791
1792 unit_path = unit_dbus_path(j->unit);
1793 if (!unit_path)
1794 return -ENOMEM;
1795
1796 r = sd_bus_message_append(reply, "uosos",
1797 j->id, job_path,
1798 j->unit->id, unit_path,
1799 job_type_to_string(j->type));
1800 if (r < 0)
1801 return r;
1802
1803 r = sd_bus_message_open_container(reply, 'a', "(uosos)");
1804 if (r < 0)
1805 return r;
1806
1807 SET_FOREACH(a, affected, i) {
1808
1809 if (a->id == j->id)
1810 continue;
1811
1812 /* Free paths from previous iteration */
1813 job_path = mfree(job_path);
1814 unit_path = mfree(unit_path);
1815
1816 job_path = job_dbus_path(a);
1817 if (!job_path)
1818 return -ENOMEM;
1819
1820 unit_path = unit_dbus_path(a->unit);
1821 if (!unit_path)
1822 return -ENOMEM;
1823
1824 r = sd_bus_message_append(reply, "(uosos)",
1825 a->id, job_path,
1826 a->unit->id, unit_path,
1827 job_type_to_string(a->type));
1828 if (r < 0)
1829 return r;
1830 }
1831
1832 r = sd_bus_message_close_container(reply);
1833 if (r < 0)
1834 return r;
1835
1836 return sd_bus_send(NULL, reply, NULL);
1837 }
1838
1839 static int bus_unit_set_live_property(
1840 Unit *u,
1841 const char *name,
1842 sd_bus_message *message,
1843 UnitWriteFlags flags,
1844 sd_bus_error *error) {
1845
1846 int r;
1847
1848 assert(u);
1849 assert(name);
1850 assert(message);
1851
1852 /* Handles setting properties both "live" (i.e. at any time during runtime), and during creation (for transient
1853 * units that are being created). */
1854
1855 if (streq(name, "Description")) {
1856 const char *d;
1857
1858 r = sd_bus_message_read(message, "s", &d);
1859 if (r < 0)
1860 return r;
1861
1862 if (!UNIT_WRITE_FLAGS_NOOP(flags)) {
1863 r = unit_set_description(u, d);
1864 if (r < 0)
1865 return r;
1866
1867 unit_write_settingf(u, flags|UNIT_ESCAPE_SPECIFIERS, name, "Description=%s", d);
1868 }
1869
1870 return 1;
1871 }
1872
1873 return 0;
1874 }
1875
1876 static int bus_set_transient_emergency_action(
1877 Unit *u,
1878 const char *name,
1879 EmergencyAction *p,
1880 sd_bus_message *message,
1881 UnitWriteFlags flags,
1882 sd_bus_error *error) {
1883
1884 const char *s;
1885 EmergencyAction v;
1886 int r;
1887 bool system;
1888
1889 assert(p);
1890
1891 r = sd_bus_message_read(message, "s", &s);
1892 if (r < 0)
1893 return r;
1894
1895 system = MANAGER_IS_SYSTEM(u->manager);
1896 r = parse_emergency_action(s, system, &v);
1897 if (r < 0)
1898 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS,
1899 r == -EOPNOTSUPP ? "%s setting invalid for manager type: %s"
1900 : "Invalid %s setting: %s",
1901 name, s);
1902
1903 if (!UNIT_WRITE_FLAGS_NOOP(flags)) {
1904 *p = v;
1905 unit_write_settingf(u, flags, name,
1906 "%s=%s", name, s);
1907 }
1908
1909 return 1;
1910 }
1911
1912 static int bus_set_transient_exit_status(
1913 Unit *u,
1914 const char *name,
1915 int *p,
1916 sd_bus_message *message,
1917 UnitWriteFlags flags,
1918 sd_bus_error *error) {
1919
1920 int32_t k;
1921 int r;
1922
1923 assert(p);
1924
1925 r = sd_bus_message_read(message, "i", &k);
1926 if (r < 0)
1927 return r;
1928
1929 if (k > 255)
1930 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Exit status must be in range 0…255 or negative.");
1931
1932 if (!UNIT_WRITE_FLAGS_NOOP(flags)) {
1933 *p = k < 0 ? -1 : k;
1934
1935 if (k < 0)
1936 unit_write_settingf(u, flags, name, "%s=", name);
1937 else
1938 unit_write_settingf(u, flags, name, "%s=%i", name, k);
1939 }
1940
1941 return 1;
1942 }
1943
1944 static BUS_DEFINE_SET_TRANSIENT_PARSE(collect_mode, CollectMode, collect_mode_from_string);
1945 static BUS_DEFINE_SET_TRANSIENT_PARSE(job_mode, JobMode, job_mode_from_string);
1946
1947 static int bus_set_transient_conditions(
1948 Unit *u,
1949 const char *name,
1950 Condition **list,
1951 bool is_condition,
1952 sd_bus_message *message,
1953 UnitWriteFlags flags,
1954 sd_bus_error *error) {
1955
1956 const char *type_name, *param;
1957 int trigger, negate, r;
1958 bool empty = true;
1959
1960 assert(list);
1961
1962 r = sd_bus_message_enter_container(message, 'a', "(sbbs)");
1963 if (r < 0)
1964 return r;
1965
1966 while ((r = sd_bus_message_read(message, "(sbbs)", &type_name, &trigger, &negate, &param)) > 0) {
1967 ConditionType t;
1968
1969 t = is_condition ? condition_type_from_string(type_name) : assert_type_from_string(type_name);
1970 if (t < 0)
1971 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid condition type: %s", type_name);
1972
1973 if (t != CONDITION_NULL) {
1974 if (isempty(param))
1975 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Condition parameter in %s is empty", type_name);
1976
1977 if (condition_takes_path(t) && !path_is_absolute(param))
1978 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Path in condition %s is not absolute: %s", type_name, param);
1979 } else
1980 param = NULL;
1981
1982 if (!UNIT_WRITE_FLAGS_NOOP(flags)) {
1983 Condition *c;
1984
1985 c = condition_new(t, param, trigger, negate);
1986 if (!c)
1987 return -ENOMEM;
1988
1989 LIST_PREPEND(conditions, *list, c);
1990
1991 if (t != CONDITION_NULL)
1992 unit_write_settingf(u, flags|UNIT_ESCAPE_SPECIFIERS, name,
1993 "%s=%s%s%s", type_name,
1994 trigger ? "|" : "", negate ? "!" : "", param);
1995 else
1996 unit_write_settingf(u, flags, name,
1997 "%s=%s%s", type_name,
1998 trigger ? "|" : "", yes_no(!negate));
1999 }
2000
2001 empty = false;
2002 }
2003 if (r < 0)
2004 return r;
2005
2006 r = sd_bus_message_exit_container(message);
2007 if (r < 0)
2008 return r;
2009
2010 if (!UNIT_WRITE_FLAGS_NOOP(flags) && empty) {
2011 *list = condition_free_list(*list);
2012 unit_write_settingf(u, flags, name, "%sNull=", is_condition ? "Condition" : "Assert");
2013 }
2014
2015 return 1;
2016 }
2017
2018 static int bus_unit_set_transient_property(
2019 Unit *u,
2020 const char *name,
2021 sd_bus_message *message,
2022 UnitWriteFlags flags,
2023 sd_bus_error *error) {
2024
2025 UnitDependency d = _UNIT_DEPENDENCY_INVALID;
2026 int r;
2027
2028 assert(u);
2029 assert(name);
2030 assert(message);
2031
2032 /* Handles settings when transient units are created. This settings cannot be altered anymore after the unit
2033 * has been created. */
2034
2035 if (streq(name, "SourcePath"))
2036 return bus_set_transient_path(u, name, &u->source_path, message, flags, error);
2037
2038 if (streq(name, "StopWhenUnneeded"))
2039 return bus_set_transient_bool(u, name, &u->stop_when_unneeded, message, flags, error);
2040
2041 if (streq(name, "RefuseManualStart"))
2042 return bus_set_transient_bool(u, name, &u->refuse_manual_start, message, flags, error);
2043
2044 if (streq(name, "RefuseManualStop"))
2045 return bus_set_transient_bool(u, name, &u->refuse_manual_stop, message, flags, error);
2046
2047 if (streq(name, "AllowIsolate"))
2048 return bus_set_transient_bool(u, name, &u->allow_isolate, message, flags, error);
2049
2050 if (streq(name, "DefaultDependencies"))
2051 return bus_set_transient_bool(u, name, &u->default_dependencies, message, flags, error);
2052
2053 if (streq(name, "OnFailureJobMode"))
2054 return bus_set_transient_job_mode(u, name, &u->on_failure_job_mode, message, flags, error);
2055
2056 if (streq(name, "IgnoreOnIsolate"))
2057 return bus_set_transient_bool(u, name, &u->ignore_on_isolate, message, flags, error);
2058
2059 if (streq(name, "JobTimeoutUSec")) {
2060 r = bus_set_transient_usec_fix_0(u, name, &u->job_timeout, message, flags, error);
2061 if (r >= 0 && !UNIT_WRITE_FLAGS_NOOP(flags) && !u->job_running_timeout_set)
2062 u->job_running_timeout = u->job_timeout;
2063 }
2064
2065 if (streq(name, "JobRunningTimeoutUSec")) {
2066 r = bus_set_transient_usec_fix_0(u, name, &u->job_running_timeout, message, flags, error);
2067 if (r >= 0 && !UNIT_WRITE_FLAGS_NOOP(flags))
2068 u->job_running_timeout_set = true;
2069
2070 return r;
2071 }
2072
2073 if (streq(name, "JobTimeoutAction"))
2074 return bus_set_transient_emergency_action(u, name, &u->job_timeout_action, message, flags, error);
2075
2076 if (streq(name, "JobTimeoutRebootArgument"))
2077 return bus_set_transient_string(u, name, &u->job_timeout_reboot_arg, message, flags, error);
2078
2079 if (streq(name, "StartLimitIntervalUSec"))
2080 return bus_set_transient_usec(u, name, &u->start_ratelimit.interval, message, flags, error);
2081
2082 if (streq(name, "StartLimitBurst"))
2083 return bus_set_transient_unsigned(u, name, &u->start_ratelimit.burst, message, flags, error);
2084
2085 if (streq(name, "StartLimitAction"))
2086 return bus_set_transient_emergency_action(u, name, &u->start_limit_action, message, flags, error);
2087
2088 if (streq(name, "FailureAction"))
2089 return bus_set_transient_emergency_action(u, name, &u->failure_action, message, flags, error);
2090
2091 if (streq(name, "SuccessAction"))
2092 return bus_set_transient_emergency_action(u, name, &u->success_action, message, flags, error);
2093
2094 if (streq(name, "FailureActionExitStatus"))
2095 return bus_set_transient_exit_status(u, name, &u->failure_action_exit_status, message, flags, error);
2096
2097 if (streq(name, "SuccessActionExitStatus"))
2098 return bus_set_transient_exit_status(u, name, &u->success_action_exit_status, message, flags, error);
2099
2100 if (streq(name, "RebootArgument"))
2101 return bus_set_transient_string(u, name, &u->reboot_arg, message, flags, error);
2102
2103 if (streq(name, "CollectMode"))
2104 return bus_set_transient_collect_mode(u, name, &u->collect_mode, message, flags, error);
2105
2106 if (streq(name, "Conditions"))
2107 return bus_set_transient_conditions(u, name, &u->conditions, true, message, flags, error);
2108
2109 if (streq(name, "Asserts"))
2110 return bus_set_transient_conditions(u, name, &u->asserts, false, message, flags, error);
2111
2112 if (streq(name, "Documentation")) {
2113 _cleanup_strv_free_ char **l = NULL;
2114 char **p;
2115
2116 r = sd_bus_message_read_strv(message, &l);
2117 if (r < 0)
2118 return r;
2119
2120 STRV_FOREACH(p, l) {
2121 if (!documentation_url_is_valid(*p))
2122 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid URL in %s: %s", name, *p);
2123 }
2124
2125 if (!UNIT_WRITE_FLAGS_NOOP(flags)) {
2126 if (strv_isempty(l)) {
2127 u->documentation = strv_free(u->documentation);
2128 unit_write_settingf(u, flags, name, "%s=", name);
2129 } else {
2130 strv_extend_strv(&u->documentation, l, false);
2131
2132 STRV_FOREACH(p, l)
2133 unit_write_settingf(u, flags, name, "%s=%s", name, *p);
2134 }
2135 }
2136
2137 return 1;
2138
2139 } else if (streq(name, "Slice")) {
2140 Unit *slice;
2141 const char *s;
2142
2143 if (!UNIT_HAS_CGROUP_CONTEXT(u))
2144 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "The slice property is only available for units with control groups.");
2145 if (u->type == UNIT_SLICE)
2146 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Slice may not be set for slice units.");
2147 if (unit_has_name(u, SPECIAL_INIT_SCOPE))
2148 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Cannot set slice for init.scope");
2149
2150 r = sd_bus_message_read(message, "s", &s);
2151 if (r < 0)
2152 return r;
2153
2154 if (!unit_name_is_valid(s, UNIT_NAME_PLAIN))
2155 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid unit name '%s'", s);
2156
2157 /* Note that we do not dispatch the load queue here yet, as we don't want our own transient unit to be
2158 * loaded while we are still setting it up. Or in other words, we use manager_load_unit_prepare()
2159 * instead of manager_load_unit() on purpose, here. */
2160 r = manager_load_unit_prepare(u->manager, s, NULL, error, &slice);
2161 if (r < 0)
2162 return r;
2163
2164 if (slice->type != UNIT_SLICE)
2165 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Unit name '%s' is not a slice", s);
2166
2167 if (!UNIT_WRITE_FLAGS_NOOP(flags)) {
2168 r = unit_set_slice(u, slice);
2169 if (r < 0)
2170 return r;
2171
2172 unit_write_settingf(u, flags|UNIT_PRIVATE, name, "Slice=%s", s);
2173 }
2174
2175 return 1;
2176
2177 } else if (streq(name, "RequiresMountsFor")) {
2178 _cleanup_strv_free_ char **l = NULL;
2179 char **p;
2180
2181 r = sd_bus_message_read_strv(message, &l);
2182 if (r < 0)
2183 return r;
2184
2185 STRV_FOREACH(p, l) {
2186 path_simplify(*p, true);
2187
2188 if (!path_is_absolute(*p))
2189 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Path specified in %s is not absolute: %s", name, *p);
2190
2191 if (!path_is_valid(*p))
2192 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Path specified in %s has invalid length: %s", name, *p);
2193
2194 if (!path_is_normalized(*p))
2195 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Path specified in %s is not normalized: %s", name, *p);
2196
2197 if (!UNIT_WRITE_FLAGS_NOOP(flags)) {
2198 r = unit_require_mounts_for(u, *p, UNIT_DEPENDENCY_FILE);
2199 if (r < 0)
2200 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Failed to add required mount \"%s\": %m", *p);
2201
2202 unit_write_settingf(u, flags, name, "%s=%s", name, *p);
2203 }
2204 }
2205
2206 return 1;
2207 }
2208
2209 if (streq(name, "RequiresOverridable"))
2210 d = UNIT_REQUIRES; /* redirect for obsolete unit dependency type */
2211 else if (streq(name, "RequisiteOverridable"))
2212 d = UNIT_REQUISITE; /* same here */
2213 else
2214 d = unit_dependency_from_string(name);
2215
2216 if (d >= 0) {
2217 const char *other;
2218
2219 if (!IN_SET(d,
2220 UNIT_REQUIRES,
2221 UNIT_REQUISITE,
2222 UNIT_WANTS,
2223 UNIT_BINDS_TO,
2224 UNIT_PART_OF,
2225 UNIT_CONFLICTS,
2226 UNIT_BEFORE,
2227 UNIT_AFTER,
2228 UNIT_ON_FAILURE,
2229 UNIT_PROPAGATES_RELOAD_TO,
2230 UNIT_RELOAD_PROPAGATED_FROM,
2231 UNIT_JOINS_NAMESPACE_OF))
2232 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Dependency type %s may not be created transiently.", unit_dependency_to_string(d));
2233
2234 r = sd_bus_message_enter_container(message, 'a', "s");
2235 if (r < 0)
2236 return r;
2237
2238 while ((r = sd_bus_message_read(message, "s", &other)) > 0) {
2239 if (!unit_name_is_valid(other, UNIT_NAME_PLAIN|UNIT_NAME_INSTANCE))
2240 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid unit name %s", other);
2241
2242 if (!UNIT_WRITE_FLAGS_NOOP(flags)) {
2243 _cleanup_free_ char *label = NULL;
2244
2245 r = unit_add_dependency_by_name(u, d, other, true, UNIT_DEPENDENCY_FILE);
2246 if (r < 0)
2247 return r;
2248
2249 label = strjoin(name, "-", other);
2250 if (!label)
2251 return -ENOMEM;
2252
2253 unit_write_settingf(u, flags, label, "%s=%s", unit_dependency_to_string(d), other);
2254 }
2255
2256 }
2257 if (r < 0)
2258 return r;
2259
2260 r = sd_bus_message_exit_container(message);
2261 if (r < 0)
2262 return r;
2263
2264 return 1;
2265
2266 } else if (streq(name, "AddRef")) {
2267
2268 int b;
2269
2270 /* Why is this called "AddRef" rather than just "Ref", or "Reference"? There's already a "Ref()" method
2271 * on the Unit interface, and it's probably not a good idea to expose a property and a method on the
2272 * same interface (well, strictly speaking AddRef isn't exposed as full property, we just read it for
2273 * transient units, but still). And "References" and "ReferencedBy" is already used as unit reference
2274 * dependency type, hence let's not confuse things with that.
2275 *
2276 * Note that we don't actually add the reference to the bus track. We do that only after the setup of
2277 * the transient unit is complete, so that setting this property multiple times in the same transient
2278 * unit creation call doesn't count as individual references. */
2279
2280 r = sd_bus_message_read(message, "b", &b);
2281 if (r < 0)
2282 return r;
2283
2284 if (!UNIT_WRITE_FLAGS_NOOP(flags))
2285 u->bus_track_add = b;
2286
2287 return 1;
2288 }
2289
2290 return 0;
2291 }
2292
2293 int bus_unit_set_properties(
2294 Unit *u,
2295 sd_bus_message *message,
2296 UnitWriteFlags flags,
2297 bool commit,
2298 sd_bus_error *error) {
2299
2300 bool for_real = false;
2301 unsigned n = 0;
2302 int r;
2303
2304 assert(u);
2305 assert(message);
2306
2307 /* We iterate through the array twice. First run we just check
2308 * if all passed data is valid, second run actually applies
2309 * it. This is to implement transaction-like behaviour without
2310 * actually providing full transactions. */
2311
2312 r = sd_bus_message_enter_container(message, 'a', "(sv)");
2313 if (r < 0)
2314 return r;
2315
2316 for (;;) {
2317 const char *name;
2318 UnitWriteFlags f;
2319
2320 r = sd_bus_message_enter_container(message, 'r', "sv");
2321 if (r < 0)
2322 return r;
2323 if (r == 0) {
2324 if (for_real || UNIT_WRITE_FLAGS_NOOP(flags))
2325 break;
2326
2327 /* Reached EOF. Let's try again, and this time for realz... */
2328 r = sd_bus_message_rewind(message, false);
2329 if (r < 0)
2330 return r;
2331
2332 for_real = true;
2333 continue;
2334 }
2335
2336 r = sd_bus_message_read(message, "s", &name);
2337 if (r < 0)
2338 return r;
2339
2340 if (!UNIT_VTABLE(u)->bus_set_property)
2341 return sd_bus_error_setf(error, SD_BUS_ERROR_PROPERTY_READ_ONLY, "Objects of this type do not support setting properties.");
2342
2343 r = sd_bus_message_enter_container(message, 'v', NULL);
2344 if (r < 0)
2345 return r;
2346
2347 /* If not for real, then mask out the two target flags */
2348 f = for_real ? flags : (flags & ~(UNIT_RUNTIME|UNIT_PERSISTENT));
2349
2350 r = UNIT_VTABLE(u)->bus_set_property(u, name, message, f, error);
2351 if (r == 0 && u->transient && u->load_state == UNIT_STUB)
2352 r = bus_unit_set_transient_property(u, name, message, f, error);
2353 if (r == 0)
2354 r = bus_unit_set_live_property(u, name, message, f, error);
2355 if (r < 0)
2356 return r;
2357
2358 if (r == 0)
2359 return sd_bus_error_setf(error, SD_BUS_ERROR_PROPERTY_READ_ONLY, "Cannot set property %s, or unknown property.", name);
2360
2361 r = sd_bus_message_exit_container(message);
2362 if (r < 0)
2363 return r;
2364
2365 r = sd_bus_message_exit_container(message);
2366 if (r < 0)
2367 return r;
2368
2369 n += for_real;
2370 }
2371
2372 r = sd_bus_message_exit_container(message);
2373 if (r < 0)
2374 return r;
2375
2376 if (commit && n > 0 && UNIT_VTABLE(u)->bus_commit_properties)
2377 UNIT_VTABLE(u)->bus_commit_properties(u);
2378
2379 return n;
2380 }
2381
2382 int bus_unit_validate_load_state(Unit *u, sd_bus_error *error) {
2383 assert(u);
2384
2385 /* Generates a pretty error if a unit isn't properly loaded. */
2386
2387 switch (u->load_state) {
2388
2389 case UNIT_LOADED:
2390 return 0;
2391
2392 case UNIT_NOT_FOUND:
2393 return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_UNIT, "Unit %s not found.", u->id);
2394
2395 case UNIT_BAD_SETTING:
2396 return sd_bus_error_setf(error, BUS_ERROR_BAD_UNIT_SETTING, "Unit %s has a bad unit file setting.", u->id);
2397
2398 case UNIT_ERROR: /* Only show .load_error in UNIT_ERROR state */
2399 return sd_bus_error_set_errnof(error, u->load_error, "Unit %s failed to load properly: %m.", u->id);
2400
2401 case UNIT_MASKED:
2402 return sd_bus_error_setf(error, BUS_ERROR_UNIT_MASKED, "Unit %s is masked.", u->id);
2403
2404 case UNIT_STUB:
2405 case UNIT_MERGED:
2406 default:
2407 return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_UNIT, "Unexpected load state of unit %s", u->id);
2408 }
2409 }
2410
2411 static int bus_unit_track_handler(sd_bus_track *t, void *userdata) {
2412 Unit *u = userdata;
2413
2414 assert(t);
2415 assert(u);
2416
2417 u->bus_track = sd_bus_track_unref(u->bus_track); /* make sure we aren't called again */
2418
2419 /* If the client that tracks us disappeared, then there's reason to believe that the cgroup is empty now too,
2420 * let's see */
2421 unit_add_to_cgroup_empty_queue(u);
2422
2423 /* Also add the unit to the GC queue, after all if the client left it might be time to GC this unit */
2424 unit_add_to_gc_queue(u);
2425
2426 return 0;
2427 }
2428
2429 static int bus_unit_allocate_bus_track(Unit *u) {
2430 int r;
2431
2432 assert(u);
2433
2434 if (u->bus_track)
2435 return 0;
2436
2437 r = sd_bus_track_new(u->manager->api_bus, &u->bus_track, bus_unit_track_handler, u);
2438 if (r < 0)
2439 return r;
2440
2441 r = sd_bus_track_set_recursive(u->bus_track, true);
2442 if (r < 0) {
2443 u->bus_track = sd_bus_track_unref(u->bus_track);
2444 return r;
2445 }
2446
2447 return 0;
2448 }
2449
2450 int bus_unit_track_add_name(Unit *u, const char *name) {
2451 int r;
2452
2453 assert(u);
2454
2455 r = bus_unit_allocate_bus_track(u);
2456 if (r < 0)
2457 return r;
2458
2459 return sd_bus_track_add_name(u->bus_track, name);
2460 }
2461
2462 int bus_unit_track_add_sender(Unit *u, sd_bus_message *m) {
2463 int r;
2464
2465 assert(u);
2466
2467 r = bus_unit_allocate_bus_track(u);
2468 if (r < 0)
2469 return r;
2470
2471 return sd_bus_track_add_sender(u->bus_track, m);
2472 }
2473
2474 int bus_unit_track_remove_sender(Unit *u, sd_bus_message *m) {
2475 assert(u);
2476
2477 /* If we haven't allocated the bus track object yet, then there's definitely no reference taken yet, return an
2478 * error */
2479 if (!u->bus_track)
2480 return -EUNATCH;
2481
2482 return sd_bus_track_remove_sender(u->bus_track, m);
2483 }
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