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ea430986 LP |
1 | /*-*- Mode: C; c-basic-offset: 8 -*-*/ |
2 | ||
a7334b09 LP |
3 | /*** |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2010 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
ea430986 LP |
22 | #include <errno.h> |
23 | ||
24 | #include "dbus.h" | |
25 | #include "log.h" | |
4139c1b2 | 26 | #include "dbus-unit.h" |
398ef8ba | 27 | #include "bus-errors.h" |
ea430986 | 28 | |
4288f619 LP |
29 | const char bus_unit_interface[] = BUS_UNIT_INTERFACE; |
30 | ||
4139c1b2 LP |
31 | int bus_unit_append_names(Manager *m, DBusMessageIter *i, const char *property, void *data) { |
32 | char *t; | |
33 | Iterator j; | |
34 | DBusMessageIter sub; | |
35 | Unit *u = data; | |
36 | ||
37 | if (!dbus_message_iter_open_container(i, DBUS_TYPE_ARRAY, "s", &sub)) | |
38 | return -ENOMEM; | |
39 | ||
40 | SET_FOREACH(t, u->meta.names, j) | |
41 | if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_STRING, &t)) | |
42 | return -ENOMEM; | |
43 | ||
44 | if (!dbus_message_iter_close_container(i, &sub)) | |
45 | return -ENOMEM; | |
46 | ||
47 | return 0; | |
48 | } | |
49 | ||
8fe914ec LP |
50 | int bus_unit_append_following(Manager *m, DBusMessageIter *i, const char *property, void *data) { |
51 | Unit *u = data; | |
52 | const char *d; | |
53 | ||
54 | assert(m); | |
55 | assert(i); | |
56 | assert(property); | |
57 | assert(u); | |
58 | ||
59 | d = u->meta.following ? u->meta.following->meta.id : ""; | |
60 | ||
61 | if (!dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, &d)) | |
62 | return -ENOMEM; | |
63 | ||
64 | return 0; | |
65 | } | |
66 | ||
5301be81 LP |
67 | int bus_unit_append_dependencies(Manager *m, DBusMessageIter *i, const char *property, void *data) { |
68 | Unit *u; | |
69 | Iterator j; | |
70 | DBusMessageIter sub; | |
71 | Set *s = data; | |
72 | ||
73 | if (!dbus_message_iter_open_container(i, DBUS_TYPE_ARRAY, "s", &sub)) | |
74 | return -ENOMEM; | |
75 | ||
76 | SET_FOREACH(u, s, j) | |
77 | if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_STRING, &u->meta.id)) | |
78 | return -ENOMEM; | |
79 | ||
80 | if (!dbus_message_iter_close_container(i, &sub)) | |
81 | return -ENOMEM; | |
82 | ||
83 | return 0; | |
84 | } | |
85 | ||
4139c1b2 | 86 | int bus_unit_append_description(Manager *m, DBusMessageIter *i, const char *property, void *data) { |
ea430986 LP |
87 | Unit *u = data; |
88 | const char *d; | |
89 | ||
90 | assert(m); | |
91 | assert(i); | |
92 | assert(property); | |
93 | assert(u); | |
94 | ||
95 | d = unit_description(u); | |
96 | ||
97 | if (!dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, &d)) | |
98 | return -ENOMEM; | |
99 | ||
100 | return 0; | |
101 | } | |
102 | ||
6f4706b7 | 103 | DEFINE_BUS_PROPERTY_APPEND_ENUM(bus_unit_append_load_state, unit_load_state, UnitLoadState); |
ea430986 | 104 | |
4139c1b2 | 105 | int bus_unit_append_active_state(Manager *m, DBusMessageIter *i, const char *property, void *data) { |
ea430986 LP |
106 | Unit *u = data; |
107 | const char *state; | |
108 | ||
109 | assert(m); | |
110 | assert(i); | |
111 | assert(property); | |
112 | assert(u); | |
113 | ||
114 | state = unit_active_state_to_string(unit_active_state(u)); | |
115 | ||
116 | if (!dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, &state)) | |
117 | return -ENOMEM; | |
118 | ||
119 | return 0; | |
120 | } | |
121 | ||
4139c1b2 | 122 | int bus_unit_append_sub_state(Manager *m, DBusMessageIter *i, const char *property, void *data) { |
10a94420 LP |
123 | Unit *u = data; |
124 | const char *state; | |
125 | ||
126 | assert(m); | |
127 | assert(i); | |
128 | assert(property); | |
129 | assert(u); | |
130 | ||
131 | state = unit_sub_state_to_string(u); | |
132 | ||
133 | if (!dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, &state)) | |
134 | return -ENOMEM; | |
135 | ||
136 | return 0; | |
137 | } | |
138 | ||
4139c1b2 | 139 | int bus_unit_append_can_start(Manager *m, DBusMessageIter *i, const char *property, void *data) { |
38131695 LP |
140 | Unit *u = data; |
141 | dbus_bool_t b; | |
142 | ||
143 | assert(m); | |
144 | assert(i); | |
145 | assert(property); | |
146 | assert(u); | |
147 | ||
064f51fa LP |
148 | b = unit_can_start(u) && |
149 | !u->meta.only_by_dependency; | |
38131695 LP |
150 | |
151 | if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &b)) | |
152 | return -ENOMEM; | |
153 | ||
154 | return 0; | |
155 | } | |
156 | ||
4139c1b2 | 157 | int bus_unit_append_can_reload(Manager *m, DBusMessageIter *i, const char *property, void *data) { |
38131695 LP |
158 | Unit *u = data; |
159 | dbus_bool_t b; | |
160 | ||
161 | assert(m); | |
162 | assert(i); | |
163 | assert(property); | |
164 | assert(u); | |
165 | ||
4139c1b2 | 166 | b = unit_can_reload(u); |
38131695 LP |
167 | |
168 | if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &b)) | |
169 | return -ENOMEM; | |
170 | ||
171 | return 0; | |
172 | } | |
173 | ||
4139c1b2 | 174 | int bus_unit_append_job(Manager *m, DBusMessageIter *i, const char *property, void *data) { |
38131695 LP |
175 | Unit *u = data; |
176 | DBusMessageIter sub; | |
177 | char *p; | |
178 | ||
179 | assert(m); | |
180 | assert(i); | |
181 | assert(property); | |
182 | assert(u); | |
183 | ||
184 | if (!dbus_message_iter_open_container(i, DBUS_TYPE_STRUCT, NULL, &sub)) | |
185 | return -ENOMEM; | |
186 | ||
187 | if (u->meta.job) { | |
188 | ||
189 | if (!(p = job_dbus_path(u->meta.job))) | |
190 | return -ENOMEM; | |
191 | ||
192 | if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_UINT32, &u->meta.job->id) || | |
86ad3bc1 | 193 | !dbus_message_iter_append_basic(&sub, DBUS_TYPE_OBJECT_PATH, &p)) { |
38131695 LP |
194 | free(p); |
195 | return -ENOMEM; | |
196 | } | |
197 | } else { | |
198 | uint32_t id = 0; | |
199 | ||
200 | /* No job, so let's fill in some placeholder | |
201 | * data. Since we need to fill in a valid path we | |
202 | * simple point to ourselves. */ | |
203 | ||
204 | if (!(p = unit_dbus_path(u))) | |
205 | return -ENOMEM; | |
206 | ||
207 | if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_UINT32, &id) || | |
86ad3bc1 | 208 | !dbus_message_iter_append_basic(&sub, DBUS_TYPE_OBJECT_PATH, &p)) { |
38131695 LP |
209 | free(p); |
210 | return -ENOMEM; | |
211 | } | |
212 | } | |
213 | ||
214 | free(p); | |
215 | ||
216 | if (!dbus_message_iter_close_container(i, &sub)) | |
217 | return -ENOMEM; | |
218 | ||
219 | return 0; | |
220 | } | |
221 | ||
4139c1b2 LP |
222 | int bus_unit_append_default_cgroup(Manager *m, DBusMessageIter *i, const char *property, void *data) { |
223 | Unit *u = data; | |
224 | char *t; | |
225 | CGroupBonding *cgb; | |
226 | bool success; | |
ea430986 | 227 | |
4139c1b2 LP |
228 | assert(m); |
229 | assert(i); | |
230 | assert(property); | |
231 | assert(u); | |
232 | ||
233 | if ((cgb = unit_get_default_cgroup(u))) { | |
234 | if (!(t = cgroup_bonding_to_string(cgb))) | |
235 | return -ENOMEM; | |
236 | } else | |
237 | t = (char*) ""; | |
ea430986 | 238 | |
4139c1b2 LP |
239 | success = dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, &t); |
240 | ||
241 | if (cgb) | |
242 | free(t); | |
243 | ||
244 | return success ? 0 : -ENOMEM; | |
245 | } | |
246 | ||
247 | int bus_unit_append_cgroups(Manager *m, DBusMessageIter *i, const char *property, void *data) { | |
248 | Unit *u = data; | |
249 | CGroupBonding *cgb; | |
250 | DBusMessageIter sub; | |
251 | ||
252 | if (!dbus_message_iter_open_container(i, DBUS_TYPE_ARRAY, "s", &sub)) | |
253 | return -ENOMEM; | |
254 | ||
255 | LIST_FOREACH(by_unit, cgb, u->meta.cgroup_bondings) { | |
256 | char *t; | |
257 | bool success; | |
258 | ||
259 | if (!(t = cgroup_bonding_to_string(cgb))) | |
260 | return -ENOMEM; | |
261 | ||
262 | success = dbus_message_iter_append_basic(&sub, DBUS_TYPE_STRING, &t); | |
263 | free(t); | |
264 | ||
265 | if (!success) | |
266 | return -ENOMEM; | |
267 | } | |
268 | ||
269 | if (!dbus_message_iter_close_container(i, &sub)) | |
270 | return -ENOMEM; | |
271 | ||
272 | return 0; | |
273 | } | |
274 | ||
45fb0699 LP |
275 | int bus_unit_append_need_daemon_reload(Manager *m, DBusMessageIter *i, const char *property, void *data) { |
276 | Unit *u = data; | |
277 | dbus_bool_t b; | |
278 | ||
279 | assert(m); | |
280 | assert(i); | |
281 | assert(property); | |
282 | assert(u); | |
283 | ||
284 | b = unit_need_daemon_reload(u); | |
285 | ||
286 | if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &b)) | |
287 | return -ENOMEM; | |
288 | ||
289 | return 0; | |
290 | } | |
291 | ||
5e8d1c9a | 292 | static DBusHandlerResult bus_unit_message_dispatch(Unit *u, DBusConnection *connection, DBusMessage *message) { |
b548631a LP |
293 | DBusMessage *reply = NULL; |
294 | Manager *m = u->meta.manager; | |
295 | DBusError error; | |
296 | JobType job_type = _JOB_TYPE_INVALID; | |
c87eba54 | 297 | char *path = NULL; |
6f28c033 | 298 | bool reload_if_possible = false; |
b548631a LP |
299 | |
300 | dbus_error_init(&error); | |
301 | ||
302 | if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Unit", "Start")) | |
303 | job_type = JOB_START; | |
304 | else if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Unit", "Stop")) | |
305 | job_type = JOB_STOP; | |
306 | else if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Unit", "Reload")) | |
307 | job_type = JOB_RELOAD; | |
308 | else if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Unit", "Restart")) | |
309 | job_type = JOB_RESTART; | |
9a1ac7b9 LP |
310 | else if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Unit", "TryRestart")) |
311 | job_type = JOB_TRY_RESTART; | |
6f28c033 LP |
312 | else if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Unit", "ReloadOrRestart")) { |
313 | reload_if_possible = true; | |
314 | job_type = JOB_RESTART; | |
315 | } else if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Unit", "ReloadOrTryRestart")) { | |
316 | reload_if_possible = true; | |
317 | job_type = JOB_TRY_RESTART; | |
5632e374 LP |
318 | } else if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Unit", "ResetMaintenance")) { |
319 | ||
320 | unit_reset_maintenance(u); | |
321 | ||
322 | if (!(reply = dbus_message_new_method_return(message))) | |
323 | goto oom; | |
324 | ||
6f28c033 | 325 | } else if (UNIT_VTABLE(u)->bus_message_handler) |
5e8d1c9a | 326 | return UNIT_VTABLE(u)->bus_message_handler(u, connection, message); |
b548631a | 327 | else |
4139c1b2 | 328 | return DBUS_HANDLER_RESULT_NOT_YET_HANDLED; |
b548631a LP |
329 | |
330 | if (job_type != _JOB_TYPE_INVALID) { | |
331 | const char *smode; | |
332 | JobMode mode; | |
333 | Job *j; | |
334 | int r; | |
b548631a | 335 | |
398ef8ba LP |
336 | if (job_type == JOB_START && u->meta.only_by_dependency) { |
337 | dbus_set_error(&error, BUS_ERROR_ONLY_BY_DEPENDENCY, "Unit may be activated by dependency only."); | |
338 | return bus_send_error_reply(m, connection, message, &error, -EPERM); | |
339 | } | |
bc0f8771 | 340 | |
b548631a LP |
341 | if (!dbus_message_get_args( |
342 | message, | |
343 | &error, | |
344 | DBUS_TYPE_STRING, &smode, | |
345 | DBUS_TYPE_INVALID)) | |
5e8d1c9a | 346 | return bus_send_error_reply(m, connection, message, &error, -EINVAL); |
b548631a | 347 | |
6f28c033 LP |
348 | if (reload_if_possible && unit_can_reload(u)) { |
349 | if (job_type == JOB_RESTART) | |
350 | job_type = JOB_RELOAD_OR_START; | |
351 | else if (job_type == JOB_TRY_RESTART) | |
352 | job_type = JOB_RELOAD; | |
353 | } | |
354 | ||
398ef8ba LP |
355 | if ((mode = job_mode_from_string(smode)) == _JOB_MODE_INVALID) { |
356 | dbus_set_error(&error, BUS_ERROR_INVALID_JOB_MODE, "Job mode %s is invalid.", smode); | |
357 | return bus_send_error_reply(m, connection, message, &error, -EINVAL); | |
358 | } | |
b548631a | 359 | |
398ef8ba LP |
360 | if ((r = manager_add_job(m, job_type, u, mode, true, &error, &j)) < 0) |
361 | return bus_send_error_reply(m, connection, message, &error, r); | |
b548631a LP |
362 | |
363 | if (!(reply = dbus_message_new_method_return(message))) | |
364 | goto oom; | |
365 | ||
366 | if (!(path = job_dbus_path(j))) | |
367 | goto oom; | |
368 | ||
369 | if (!dbus_message_append_args( | |
370 | reply, | |
371 | DBUS_TYPE_OBJECT_PATH, &path, | |
372 | DBUS_TYPE_INVALID)) | |
373 | goto oom; | |
374 | } | |
375 | ||
c87eba54 LP |
376 | free(path); |
377 | ||
b548631a | 378 | if (reply) { |
5e8d1c9a | 379 | if (!dbus_connection_send(connection, reply, NULL)) |
b548631a LP |
380 | goto oom; |
381 | ||
382 | dbus_message_unref(reply); | |
383 | } | |
384 | ||
385 | return DBUS_HANDLER_RESULT_HANDLED; | |
386 | ||
387 | oom: | |
c87eba54 LP |
388 | free(path); |
389 | ||
b548631a LP |
390 | if (reply) |
391 | dbus_message_unref(reply); | |
392 | ||
393 | dbus_error_free(&error); | |
394 | ||
395 | return DBUS_HANDLER_RESULT_NEED_MEMORY; | |
ea430986 LP |
396 | } |
397 | ||
5e8d1c9a | 398 | static DBusHandlerResult bus_unit_message_handler(DBusConnection *connection, DBusMessage *message, void *data) { |
ea430986 LP |
399 | Manager *m = data; |
400 | Unit *u; | |
401 | int r; | |
402 | ||
403 | assert(connection); | |
404 | assert(message); | |
405 | assert(m); | |
406 | ||
ea430986 LP |
407 | if ((r = manager_get_unit_from_dbus_path(m, dbus_message_get_path(message), &u)) < 0) { |
408 | ||
409 | if (r == -ENOMEM) | |
410 | return DBUS_HANDLER_RESULT_NEED_MEMORY; | |
411 | ||
412 | if (r == -ENOENT) | |
413 | return DBUS_HANDLER_RESULT_NOT_YET_HANDLED; | |
414 | ||
5e8d1c9a | 415 | return bus_send_error_reply(m, connection, message, NULL, r); |
ea430986 LP |
416 | } |
417 | ||
5e8d1c9a | 418 | return bus_unit_message_dispatch(u, connection, message); |
ea430986 LP |
419 | } |
420 | ||
421 | const DBusObjectPathVTable bus_unit_vtable = { | |
422 | .message_function = bus_unit_message_handler | |
423 | }; | |
c1e1601e LP |
424 | |
425 | void bus_unit_send_change_signal(Unit *u) { | |
426 | char *p = NULL; | |
427 | DBusMessage *m = NULL; | |
428 | ||
429 | assert(u); | |
c1e1601e | 430 | |
c0bd0cf7 LP |
431 | if (u->meta.in_dbus_queue) { |
432 | LIST_REMOVE(Meta, dbus_queue, u->meta.manager->dbus_unit_queue, &u->meta); | |
433 | u->meta.in_dbus_queue = false; | |
434 | } | |
c1e1601e | 435 | |
a567261a | 436 | if (!bus_has_subscriber(u->meta.manager)) { |
94b6dfa2 | 437 | u->meta.sent_dbus_new_signal = true; |
c1e1601e | 438 | return; |
94b6dfa2 | 439 | } |
c1e1601e LP |
440 | |
441 | if (!(p = unit_dbus_path(u))) | |
442 | goto oom; | |
443 | ||
444 | if (u->meta.sent_dbus_new_signal) { | |
445 | /* Send a change signal */ | |
446 | ||
447 | if (!(m = dbus_message_new_signal(p, "org.freedesktop.systemd1.Unit", "Changed"))) | |
448 | goto oom; | |
449 | } else { | |
c1e1601e LP |
450 | /* Send a new signal */ |
451 | ||
701cc384 | 452 | if (!(m = dbus_message_new_signal("/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "UnitNew"))) |
c1e1601e LP |
453 | goto oom; |
454 | ||
c1e1601e | 455 | if (!dbus_message_append_args(m, |
9e2f7c11 | 456 | DBUS_TYPE_STRING, &u->meta.id, |
c1e1601e LP |
457 | DBUS_TYPE_OBJECT_PATH, &p, |
458 | DBUS_TYPE_INVALID)) | |
459 | goto oom; | |
460 | } | |
461 | ||
5e8d1c9a | 462 | if (bus_broadcast(u->meta.manager, m) < 0) |
c1e1601e LP |
463 | goto oom; |
464 | ||
465 | free(p); | |
466 | dbus_message_unref(m); | |
467 | ||
468 | u->meta.sent_dbus_new_signal = true; | |
469 | ||
470 | return; | |
471 | ||
472 | oom: | |
473 | free(p); | |
474 | ||
475 | if (m) | |
476 | dbus_message_unref(m); | |
477 | ||
478 | log_error("Failed to allocate unit change/new signal."); | |
479 | } | |
480 | ||
481 | void bus_unit_send_removed_signal(Unit *u) { | |
482 | char *p = NULL; | |
483 | DBusMessage *m = NULL; | |
c1e1601e LP |
484 | |
485 | assert(u); | |
486 | ||
a567261a | 487 | if (!bus_has_subscriber(u->meta.manager)) |
c1e1601e LP |
488 | return; |
489 | ||
7535cc78 LP |
490 | if (!u->meta.sent_dbus_new_signal) |
491 | bus_unit_send_change_signal(u); | |
492 | ||
c1e1601e LP |
493 | if (!(p = unit_dbus_path(u))) |
494 | goto oom; | |
495 | ||
701cc384 | 496 | if (!(m = dbus_message_new_signal("/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "UnitRemoved"))) |
c1e1601e LP |
497 | goto oom; |
498 | ||
c1e1601e | 499 | if (!dbus_message_append_args(m, |
9e2f7c11 | 500 | DBUS_TYPE_STRING, &u->meta.id, |
c1e1601e LP |
501 | DBUS_TYPE_OBJECT_PATH, &p, |
502 | DBUS_TYPE_INVALID)) | |
503 | goto oom; | |
504 | ||
5e8d1c9a | 505 | if (bus_broadcast(u->meta.manager, m) < 0) |
c1e1601e LP |
506 | goto oom; |
507 | ||
508 | free(p); | |
509 | dbus_message_unref(m); | |
510 | ||
511 | return; | |
512 | ||
513 | oom: | |
514 | free(p); | |
515 | ||
516 | if (m) | |
517 | dbus_message_unref(m); | |
518 | ||
519 | log_error("Failed to allocate unit remove signal."); | |
520 | } |