1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2010 Lennart Poettering
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.
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.
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/>.
26 #include "dbus-unit.h"
27 #include "bus-errors.h"
29 const char bus_unit_interface[] = BUS_UNIT_INTERFACE;
31 #define INVALIDATING_PROPERTIES \
35 "InactiveExitTimestamp\0" \
36 "ActiveEnterTimestamp\0" \
37 "ActiveExitTimestamp\0" \
38 "InactiveEnterTimestamp\0" \
40 "NeedDaemonReload\0" \
43 int bus_unit_append_names(Manager *m, DBusMessageIter *i, const char *property, void *data) {
49 if (!dbus_message_iter_open_container(i, DBUS_TYPE_ARRAY, "s", &sub))
52 SET_FOREACH(t, u->meta.names, j)
53 if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_STRING, &t))
56 if (!dbus_message_iter_close_container(i, &sub))
62 int bus_unit_append_following(Manager *m, DBusMessageIter *i, const char *property, void *data) {
71 f = unit_following(u);
72 d = f ? f->meta.id : "";
74 if (!dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, &d))
80 int bus_unit_append_dependencies(Manager *m, DBusMessageIter *i, const char *property, void *data) {
86 if (!dbus_message_iter_open_container(i, DBUS_TYPE_ARRAY, "s", &sub))
90 if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_STRING, &u->meta.id))
93 if (!dbus_message_iter_close_container(i, &sub))
99 int bus_unit_append_description(Manager *m, DBusMessageIter *i, const char *property, void *data) {
108 d = unit_description(u);
110 if (!dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, &d))
116 DEFINE_BUS_PROPERTY_APPEND_ENUM(bus_unit_append_load_state, unit_load_state, UnitLoadState);
118 int bus_unit_append_active_state(Manager *m, DBusMessageIter *i, const char *property, void *data) {
127 state = unit_active_state_to_string(unit_active_state(u));
129 if (!dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, &state))
135 int bus_unit_append_sub_state(Manager *m, DBusMessageIter *i, const char *property, void *data) {
144 state = unit_sub_state_to_string(u);
146 if (!dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, &state))
152 int bus_unit_append_can_start(Manager *m, DBusMessageIter *i, const char *property, void *data) {
161 b = unit_can_start(u) &&
162 !u->meta.refuse_manual_start;
164 if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &b))
170 int bus_unit_append_can_stop(Manager *m, DBusMessageIter *i, const char *property, void *data) {
179 /* On the lower levels we assume that every unit we can start
180 * we can also stop */
182 b = unit_can_start(u) &&
183 !u->meta.refuse_manual_stop;
185 if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &b))
191 int bus_unit_append_can_reload(Manager *m, DBusMessageIter *i, const char *property, void *data) {
200 b = unit_can_reload(u);
202 if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &b))
208 int bus_unit_append_job(Manager *m, DBusMessageIter *i, const char *property, void *data) {
218 if (!dbus_message_iter_open_container(i, DBUS_TYPE_STRUCT, NULL, &sub))
223 if (!(p = job_dbus_path(u->meta.job)))
226 if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_UINT32, &u->meta.job->id) ||
227 !dbus_message_iter_append_basic(&sub, DBUS_TYPE_OBJECT_PATH, &p)) {
234 /* No job, so let's fill in some placeholder
235 * data. Since we need to fill in a valid path we
236 * simple point to ourselves. */
238 if (!(p = unit_dbus_path(u)))
241 if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_UINT32, &id) ||
242 !dbus_message_iter_append_basic(&sub, DBUS_TYPE_OBJECT_PATH, &p)) {
250 if (!dbus_message_iter_close_container(i, &sub))
256 int bus_unit_append_default_cgroup(Manager *m, DBusMessageIter *i, const char *property, void *data) {
267 if ((cgb = unit_get_default_cgroup(u))) {
268 if (!(t = cgroup_bonding_to_string(cgb)))
273 success = dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, &t);
278 return success ? 0 : -ENOMEM;
281 int bus_unit_append_cgroups(Manager *m, DBusMessageIter *i, const char *property, void *data) {
286 if (!dbus_message_iter_open_container(i, DBUS_TYPE_ARRAY, "s", &sub))
289 LIST_FOREACH(by_unit, cgb, u->meta.cgroup_bondings) {
293 if (!(t = cgroup_bonding_to_string(cgb)))
296 success = dbus_message_iter_append_basic(&sub, DBUS_TYPE_STRING, &t);
303 if (!dbus_message_iter_close_container(i, &sub))
309 int bus_unit_append_need_daemon_reload(Manager *m, DBusMessageIter *i, const char *property, void *data) {
318 b = unit_need_daemon_reload(u);
320 if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &b))
326 static DBusHandlerResult bus_unit_message_dispatch(Unit *u, DBusConnection *connection, DBusMessage *message) {
327 DBusMessage *reply = NULL;
328 Manager *m = u->meta.manager;
330 JobType job_type = _JOB_TYPE_INVALID;
332 bool reload_if_possible = false;
334 dbus_error_init(&error);
336 if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Unit", "Start"))
337 job_type = JOB_START;
338 else if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Unit", "Stop"))
340 else if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Unit", "Reload"))
341 job_type = JOB_RELOAD;
342 else if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Unit", "Restart"))
343 job_type = JOB_RESTART;
344 else if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Unit", "TryRestart"))
345 job_type = JOB_TRY_RESTART;
346 else if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Unit", "ReloadOrRestart")) {
347 reload_if_possible = true;
348 job_type = JOB_RESTART;
349 } else if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Unit", "ReloadOrTryRestart")) {
350 reload_if_possible = true;
351 job_type = JOB_TRY_RESTART;
352 } else if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Unit", "ResetMaintenance")) {
354 unit_reset_maintenance(u);
356 if (!(reply = dbus_message_new_method_return(message)))
359 } else if (UNIT_VTABLE(u)->bus_message_handler)
360 return UNIT_VTABLE(u)->bus_message_handler(u, connection, message);
362 return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
364 if (job_type != _JOB_TYPE_INVALID) {
370 if ((job_type == JOB_START && u->meta.refuse_manual_start) ||
371 (job_type == JOB_STOP && u->meta.refuse_manual_stop) ||
372 ((job_type == JOB_RESTART || job_type == JOB_TRY_RESTART) &&
373 (u->meta.refuse_manual_start || u->meta.refuse_manual_stop))) {
374 dbus_set_error(&error, BUS_ERROR_ONLY_BY_DEPENDENCY, "Operation refused, may be requested by dependency only.");
375 return bus_send_error_reply(m, connection, message, &error, -EPERM);
378 if (!dbus_message_get_args(
381 DBUS_TYPE_STRING, &smode,
383 return bus_send_error_reply(m, connection, message, &error, -EINVAL);
385 if (reload_if_possible && unit_can_reload(u)) {
386 if (job_type == JOB_RESTART)
387 job_type = JOB_RELOAD_OR_START;
388 else if (job_type == JOB_TRY_RESTART)
389 job_type = JOB_RELOAD;
392 if ((mode = job_mode_from_string(smode)) == _JOB_MODE_INVALID) {
393 dbus_set_error(&error, BUS_ERROR_INVALID_JOB_MODE, "Job mode %s is invalid.", smode);
394 return bus_send_error_reply(m, connection, message, &error, -EINVAL);
397 if ((r = manager_add_job(m, job_type, u, mode, true, &error, &j)) < 0)
398 return bus_send_error_reply(m, connection, message, &error, r);
400 if (!(reply = dbus_message_new_method_return(message)))
403 if (!(path = job_dbus_path(j)))
406 if (!dbus_message_append_args(
408 DBUS_TYPE_OBJECT_PATH, &path,
416 if (!dbus_connection_send(connection, reply, NULL))
419 dbus_message_unref(reply);
422 return DBUS_HANDLER_RESULT_HANDLED;
428 dbus_message_unref(reply);
430 dbus_error_free(&error);
432 return DBUS_HANDLER_RESULT_NEED_MEMORY;
435 static DBusHandlerResult bus_unit_message_handler(DBusConnection *connection, DBusMessage *message, void *data) {
444 if ((r = manager_get_unit_from_dbus_path(m, dbus_message_get_path(message), &u)) < 0) {
447 return DBUS_HANDLER_RESULT_NEED_MEMORY;
450 return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
452 return bus_send_error_reply(m, connection, message, NULL, r);
455 return bus_unit_message_dispatch(u, connection, message);
458 const DBusObjectPathVTable bus_unit_vtable = {
459 .message_function = bus_unit_message_handler
462 void bus_unit_send_change_signal(Unit *u) {
464 DBusMessage *m = NULL;
468 if (u->meta.in_dbus_queue) {
469 LIST_REMOVE(Meta, dbus_queue, u->meta.manager->dbus_unit_queue, &u->meta);
470 u->meta.in_dbus_queue = false;
476 if (!bus_has_subscriber(u->meta.manager)) {
477 u->meta.sent_dbus_new_signal = true;
481 if (!(p = unit_dbus_path(u)))
484 if (u->meta.sent_dbus_new_signal) {
485 /* Send a properties changed signal. First for the
486 * specific type, then for the generic unit. The
487 * clients may rely on this order to get atomic
488 * behaviour if needed. */
490 if (UNIT_VTABLE(u)->bus_invalidating_properties) {
492 if (!(m = bus_properties_changed_new(p,
493 UNIT_VTABLE(u)->bus_interface,
494 UNIT_VTABLE(u)->bus_invalidating_properties)))
497 if (bus_broadcast(u->meta.manager, m) < 0)
500 dbus_message_unref(m);
503 if (!(m = bus_properties_changed_new(p, "org.freedesktop.systemd1.Unit", INVALIDATING_PROPERTIES)))
507 /* Send a new signal */
509 if (!(m = dbus_message_new_signal("/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "UnitNew")))
512 if (!dbus_message_append_args(m,
513 DBUS_TYPE_STRING, &u->meta.id,
514 DBUS_TYPE_OBJECT_PATH, &p,
519 if (bus_broadcast(u->meta.manager, m) < 0)
523 dbus_message_unref(m);
525 u->meta.sent_dbus_new_signal = true;
533 dbus_message_unref(m);
535 log_error("Failed to allocate unit change/new signal.");
538 void bus_unit_send_removed_signal(Unit *u) {
540 DBusMessage *m = NULL;
544 if (!bus_has_subscriber(u->meta.manager))
547 if (!u->meta.sent_dbus_new_signal)
548 bus_unit_send_change_signal(u);
553 if (!(p = unit_dbus_path(u)))
556 if (!(m = dbus_message_new_signal("/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "UnitRemoved")))
559 if (!dbus_message_append_args(m,
560 DBUS_TYPE_STRING, &u->meta.id,
561 DBUS_TYPE_OBJECT_PATH, &p,
565 if (bus_broadcast(u->meta.manager, m) < 0)
569 dbus_message_unref(m);
577 dbus_message_unref(m);
579 log_error("Failed to allocate unit remove signal.");