1 /*-*- Mode: C; c-basic-offset: 8 -*-*/
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/>.
22 #include <dbus/dbus.h>
24 #include <sys/epoll.h>
25 #include <sys/timerfd.h>
34 static void api_bus_dispatch_status(DBusConnection
*bus
, DBusDispatchStatus status
, void *data
) {
43 assert(m
->api_bus
== bus
);
45 m
->request_api_bus_dispatch
= status
!= DBUS_DISPATCH_COMPLETE
;
48 static void system_bus_dispatch_status(DBusConnection
*bus
, DBusDispatchStatus status
, void *data
) {
57 assert(m
->system_bus
== bus
);
59 m
->request_system_bus_dispatch
= status
!= DBUS_DISPATCH_COMPLETE
;
62 static uint32_t bus_flags_to_events(DBusWatch
*bus_watch
) {
68 /* no watch flags for disabled watches */
69 if (!dbus_watch_get_enabled(bus_watch
))
72 flags
= dbus_watch_get_flags(bus_watch
);
74 if (flags
& DBUS_WATCH_READABLE
)
76 if (flags
& DBUS_WATCH_WRITABLE
)
79 return events
| EPOLLHUP
| EPOLLERR
;
82 static unsigned events_to_bus_flags(uint32_t events
) {
86 flags
|= DBUS_WATCH_READABLE
;
87 if (events
& EPOLLOUT
)
88 flags
|= DBUS_WATCH_WRITABLE
;
89 if (events
& EPOLLHUP
)
90 flags
|= DBUS_WATCH_HANGUP
;
91 if (events
& EPOLLERR
)
92 flags
|= DBUS_WATCH_ERROR
;
97 void bus_watch_event(Manager
*m
, Watch
*w
, int events
) {
101 /* This is called by the event loop whenever there is
102 * something happening on D-Bus' file handles. */
104 if (!dbus_watch_get_enabled(w
->data
.bus_watch
))
107 dbus_watch_handle(w
->data
.bus_watch
, events_to_bus_flags(events
));
110 static dbus_bool_t
bus_add_watch(DBusWatch
*bus_watch
, void *data
) {
113 struct epoll_event ev
;
118 if (!(w
= new0(Watch
, 1)))
121 w
->fd
= dbus_watch_get_unix_fd(bus_watch
);
122 w
->type
= WATCH_DBUS_WATCH
;
123 w
->data
.bus_watch
= bus_watch
;
126 ev
.events
= bus_flags_to_events(bus_watch
);
129 if (epoll_ctl(m
->epoll_fd
, EPOLL_CTL_ADD
, w
->fd
, &ev
) < 0) {
131 if (errno
!= EEXIST
) {
136 /* Hmm, bloody D-Bus creates multiple watches on the
137 * same fd. epoll() does not like that. As a dirty
138 * hack we simply dup() the fd and hence get a second
139 * one we can safely add to the epoll(). */
141 if ((w
->fd
= dup(w
->fd
)) < 0) {
146 if (epoll_ctl(m
->epoll_fd
, EPOLL_CTL_ADD
, w
->fd
, &ev
) < 0) {
148 close_nointr_nofail(w
->fd
);
152 w
->fd_is_dupped
= true;
155 dbus_watch_set_data(bus_watch
, w
, NULL
);
160 static void bus_remove_watch(DBusWatch
*bus_watch
, void *data
) {
167 if (!(w
= dbus_watch_get_data(bus_watch
)))
170 assert(w
->type
== WATCH_DBUS_WATCH
);
171 assert_se(epoll_ctl(m
->epoll_fd
, EPOLL_CTL_DEL
, w
->fd
, NULL
) >= 0);
174 close_nointr_nofail(w
->fd
);
179 static void bus_toggle_watch(DBusWatch
*bus_watch
, void *data
) {
182 struct epoll_event ev
;
187 assert_se(w
= dbus_watch_get_data(bus_watch
));
188 assert(w
->type
== WATCH_DBUS_WATCH
);
191 ev
.events
= bus_flags_to_events(bus_watch
);
194 assert_se(epoll_ctl(m
->epoll_fd
, EPOLL_CTL_MOD
, w
->fd
, &ev
) == 0);
197 static int bus_timeout_arm(Manager
*m
, Watch
*w
) {
198 struct itimerspec its
;
205 if (dbus_timeout_get_enabled(w
->data
.bus_timeout
)) {
206 timespec_store(&its
.it_value
, dbus_timeout_get_interval(w
->data
.bus_timeout
) * USEC_PER_MSEC
);
207 its
.it_interval
= its
.it_interval
;
210 if (timerfd_settime(w
->fd
, 0, &its
, NULL
) < 0)
216 void bus_timeout_event(Manager
*m
, Watch
*w
, int events
) {
220 /* This is called by the event loop whenever there is
221 * something happening on D-Bus' file handles. */
223 if (!(dbus_timeout_get_enabled(w
->data
.bus_timeout
)))
226 dbus_timeout_handle(w
->data
.bus_timeout
);
229 static dbus_bool_t
bus_add_timeout(DBusTimeout
*timeout
, void *data
) {
232 struct epoll_event ev
;
237 if (!(w
= new0(Watch
, 1)))
240 if (!(w
->fd
= timerfd_create(CLOCK_MONOTONIC
, TFD_NONBLOCK
|TFD_CLOEXEC
)) < 0)
243 w
->type
= WATCH_DBUS_TIMEOUT
;
244 w
->data
.bus_timeout
= timeout
;
246 if (bus_timeout_arm(m
, w
) < 0)
253 if (epoll_ctl(m
->epoll_fd
, EPOLL_CTL_ADD
, w
->fd
, &ev
) < 0)
256 dbus_timeout_set_data(timeout
, w
, NULL
);
262 close_nointr_nofail(w
->fd
);
268 static void bus_remove_timeout(DBusTimeout
*timeout
, void *data
) {
275 if (!(w
= dbus_timeout_get_data(timeout
)))
278 assert(w
->type
== WATCH_DBUS_TIMEOUT
);
279 assert_se(epoll_ctl(m
->epoll_fd
, EPOLL_CTL_DEL
, w
->fd
, NULL
) >= 0);
280 close_nointr_nofail(w
->fd
);
284 static void bus_toggle_timeout(DBusTimeout
*timeout
, void *data
) {
292 assert_se(w
= dbus_timeout_get_data(timeout
));
293 assert(w
->type
== WATCH_DBUS_TIMEOUT
);
295 if ((r
= bus_timeout_arm(m
, w
)) < 0)
296 log_error("Failed to rearm timer: %s", strerror(-r
));
299 static DBusHandlerResult
api_bus_message_filter(DBusConnection
*connection
, DBusMessage
*message
, void *data
) {
307 dbus_error_init(&error
);
309 /* log_debug("Got D-Bus request: %s.%s() on %s", */
310 /* dbus_message_get_interface(message), */
311 /* dbus_message_get_member(message), */
312 /* dbus_message_get_path(message)); */
314 if (dbus_message_is_signal(message
, DBUS_INTERFACE_LOCAL
, "Disconnected")) {
315 log_error("Warning! API D-Bus connection terminated.");
318 } else if (dbus_message_is_signal(message
, DBUS_INTERFACE_DBUS
, "NameOwnerChanged")) {
319 const char *name
, *old
, *new;
321 if (!dbus_message_get_args(message
, &error
,
322 DBUS_TYPE_STRING
, &name
,
323 DBUS_TYPE_STRING
, &old
,
324 DBUS_TYPE_STRING
, &new,
326 log_error("Failed to parse NameOwnerChanged message: %s", error
.message
);
328 if (set_remove(m
->subscribed
, (char*) name
))
329 log_debug("Subscription client vanished: %s (left: %u)", name
, set_size(m
->subscribed
));
333 dbus_error_free(&error
);
334 return DBUS_HANDLER_RESULT_NOT_YET_HANDLED
;
337 static DBusHandlerResult
system_bus_message_filter(DBusConnection
*connection
, DBusMessage
*message
, void *data
) {
345 dbus_error_init(&error
);
347 /* log_debug("Got D-Bus request: %s.%s() on %s", */
348 /* dbus_message_get_interface(message), */
349 /* dbus_message_get_member(message), */
350 /* dbus_message_get_path(message)); */
352 if (dbus_message_is_signal(message
, DBUS_INTERFACE_LOCAL
, "Disconnected")) {
353 log_error("Warning! System D-Bus connection terminated.");
356 } if (dbus_message_is_signal(message
, "org.freedesktop.systemd1.Agent", "Released")) {
359 if (!dbus_message_get_args(message
, &error
,
360 DBUS_TYPE_STRING
, &cgroup
,
362 log_error("Failed to parse Released message: %s", error
.message
);
364 cgroup_notify_empty(m
, cgroup
);
367 dbus_error_free(&error
);
368 return DBUS_HANDLER_RESULT_NOT_YET_HANDLED
;
371 unsigned bus_dispatch(Manager
*m
) {
374 if (m
->request_api_bus_dispatch
) {
375 if (dbus_connection_dispatch(m
->api_bus
) == DBUS_DISPATCH_COMPLETE
)
376 m
->request_api_bus_dispatch
= false;
381 if (m
->request_system_bus_dispatch
) {
382 if (dbus_connection_dispatch(m
->system_bus
) == DBUS_DISPATCH_COMPLETE
)
383 m
->request_system_bus_dispatch
= false;
391 static void pending_cb(DBusPendingCall
*pending
, void *userdata
) {
395 dbus_error_init(&error
);
397 assert_se(reply
= dbus_pending_call_steal_reply(pending
));
399 switch (dbus_message_get_type(reply
)) {
401 case DBUS_MESSAGE_TYPE_ERROR
:
403 assert_se(dbus_set_error_from_message(&error
, reply
));
404 log_warning("RequestName() failed: %s", error
.message
);
407 case DBUS_MESSAGE_TYPE_METHOD_RETURN
: {
410 if (!dbus_message_get_args(reply
,
412 DBUS_TYPE_UINT32
, &r
,
413 DBUS_TYPE_INVALID
)) {
414 log_error("Failed to parse RequestName() reply: %s", error
.message
);
419 log_debug("Successfully acquired name.");
421 log_error("Name already owned.");
427 assert_not_reached("Invalid reply message");
430 dbus_message_unref(reply
);
431 dbus_error_free(&error
);
434 static int request_name(Manager
*m
) {
435 DBusMessage
*message
;
436 const char *name
= "org.freedesktop.systemd1";
438 DBusPendingCall
*pending
;
440 if (!(message
= dbus_message_new_method_call(
447 if (!dbus_message_append_args(
449 DBUS_TYPE_STRING
, &name
,
450 DBUS_TYPE_UINT32
, &flags
,
451 DBUS_TYPE_INVALID
)) {
452 dbus_message_unref(message
);
456 if (!dbus_connection_send_with_reply(m
->api_bus
, message
, &pending
, -1)) {
457 dbus_message_unref(message
);
462 dbus_message_unref(message
);
464 if (!dbus_pending_call_set_notify(pending
, pending_cb
, NULL
, NULL
)) {
465 dbus_pending_call_cancel(pending
);
466 dbus_pending_call_unref(pending
);
471 dbus_pending_call_unref(pending
);
473 /* We simple ask for the name and don't wait for it. Sooner or
474 * later we'll have it. */
479 static int bus_setup_loop(Manager
*m
, DBusConnection
*bus
) {
483 dbus_connection_set_exit_on_disconnect(bus
, FALSE
);
485 if (!dbus_connection_set_watch_functions(bus
, bus_add_watch
, bus_remove_watch
, bus_toggle_watch
, m
, NULL
) ||
486 !dbus_connection_set_timeout_functions(bus
, bus_add_timeout
, bus_remove_timeout
, bus_toggle_timeout
, m
, NULL
))
492 int bus_init_system(Manager
*m
) {
499 dbus_error_init(&error
);
504 if (m
->running_as
!= MANAGER_SESSION
&& m
->api_bus
)
505 m
->system_bus
= m
->api_bus
;
507 if (!(m
->system_bus
= dbus_bus_get_private(DBUS_BUS_SYSTEM
, &error
))) {
508 log_debug("Failed to get system D-Bus connection, retrying later: %s", error
.message
);
509 dbus_error_free(&error
);
513 dbus_connection_set_dispatch_status_function(m
->system_bus
, system_bus_dispatch_status
, m
, NULL
);
514 m
->request_system_bus_dispatch
= true;
516 if ((r
= bus_setup_loop(m
, m
->system_bus
)) < 0) {
522 if (!dbus_connection_add_filter(m
->system_bus
, system_bus_message_filter
, m
, NULL
)) {
527 dbus_bus_add_match(m
->system_bus
,
529 "interface='org.freedesktop.systemd1.Agent',"
530 "path='/org/freedesktop/systemd1/agent'",
533 if (dbus_error_is_set(&error
)) {
534 log_error("Failed to register match: %s", error
.message
);
535 dbus_error_free(&error
);
540 log_debug("Successfully connected to system D-Bus bus %s as %s",
541 strnull((id
= dbus_connection_get_server_id(m
->system_bus
))),
542 strnull(dbus_bus_get_unique_name(m
->system_bus
)));
548 int bus_init_api(Manager
*m
) {
555 dbus_error_init(&error
);
560 if (m
->running_as
!= MANAGER_SESSION
&& m
->system_bus
)
561 m
->api_bus
= m
->system_bus
;
563 if (!(m
->api_bus
= dbus_bus_get_private(m
->running_as
== MANAGER_SESSION
? DBUS_BUS_SESSION
: DBUS_BUS_SYSTEM
, &error
))) {
564 log_debug("Failed to get API D-Bus connection, retrying later: %s", error
.message
);
565 dbus_error_free(&error
);
569 dbus_connection_set_dispatch_status_function(m
->api_bus
, api_bus_dispatch_status
, m
, NULL
);
570 m
->request_api_bus_dispatch
= true;
572 if ((r
= bus_setup_loop(m
, m
->api_bus
)) < 0) {
578 if (!dbus_connection_register_object_path(m
->api_bus
, "/org/freedesktop/systemd1", &bus_manager_vtable
, m
) ||
579 !dbus_connection_register_fallback(m
->api_bus
, "/org/freedesktop/systemd1/unit", &bus_unit_vtable
, m
) ||
580 !dbus_connection_register_fallback(m
->api_bus
, "/org/freedesktop/systemd1/job", &bus_job_vtable
, m
) ||
581 !dbus_connection_add_filter(m
->api_bus
, api_bus_message_filter
, m
, NULL
)) {
586 dbus_bus_add_match(m
->api_bus
,
588 "sender='"DBUS_SERVICE_DBUS
"',"
589 "interface='"DBUS_INTERFACE_DBUS
"',"
590 "path='"DBUS_PATH_DBUS
"'",
593 if (dbus_error_is_set(&error
)) {
594 log_error("Failed to register match: %s", error
.message
);
595 dbus_error_free(&error
);
600 if ((r
= request_name(m
)) < 0) {
605 log_debug("Successfully connected to API D-Bus bus %s as %s",
606 strnull((id
= dbus_connection_get_server_id(m
->api_bus
))),
607 strnull(dbus_bus_get_unique_name(m
->api_bus
)));
611 if (!(m
->subscribed
= set_new(string_hash_func
, string_compare_func
)))
617 void bus_done_api(Manager
*m
) {
621 if (m
->system_bus
== m
->api_bus
)
622 m
->system_bus
= NULL
;
624 dbus_connection_set_dispatch_status_function(m
->api_bus
, NULL
, NULL
, NULL
);
625 dbus_connection_close(m
->api_bus
);
626 dbus_connection_unref(m
->api_bus
);
633 while ((c
= set_steal_first(m
->subscribed
)))
636 set_free(m
->subscribed
);
637 m
->subscribed
= NULL
;
641 void bus_done_system(Manager
*m
) {
644 if (m
->system_bus
== m
->api_bus
)
648 dbus_connection_set_dispatch_status_function(m
->system_bus
, NULL
, NULL
, NULL
);
649 dbus_connection_close(m
->system_bus
);
650 dbus_connection_unref(m
->system_bus
);
651 m
->system_bus
= NULL
;
655 DBusHandlerResult
bus_default_message_handler(Manager
*m
, DBusMessage
*message
, const char*introspection
, const BusProperty
*properties
) {
657 DBusMessage
*reply
= NULL
;
663 dbus_error_init(&error
);
665 if (dbus_message_is_method_call(message
, "org.freedesktop.DBus.Introspectable", "Introspect") && introspection
) {
667 if (!(reply
= dbus_message_new_method_return(message
)))
670 if (!dbus_message_append_args(reply
, DBUS_TYPE_STRING
, &introspection
, DBUS_TYPE_INVALID
))
673 } else if (dbus_message_is_method_call(message
, "org.freedesktop.DBus.Properties", "Get") && properties
) {
674 const char *interface
, *property
;
675 const BusProperty
*p
;
677 if (!dbus_message_get_args(
680 DBUS_TYPE_STRING
, &interface
,
681 DBUS_TYPE_STRING
, &property
,
683 return bus_send_error_reply(m
, message
, &error
, -EINVAL
);
685 for (p
= properties
; p
->property
; p
++)
686 if (streq(p
->interface
, interface
) && streq(p
->property
, property
))
690 DBusMessageIter iter
, sub
;
692 if (!(reply
= dbus_message_new_method_return(message
)))
695 dbus_message_iter_init_append(reply
, &iter
);
697 if (!dbus_message_iter_open_container(&iter
, DBUS_TYPE_VARIANT
, p
->signature
, &sub
))
700 if ((r
= p
->append(m
, &sub
, property
, (void*) p
->data
)) < 0) {
705 dbus_message_unref(reply
);
706 return bus_send_error_reply(m
, message
, NULL
, r
);
709 if (!dbus_message_iter_close_container(&iter
, &sub
))
712 } else if (dbus_message_is_method_call(message
, "org.freedesktop.DBus.Properties", "GetAll") && properties
) {
713 const char *interface
;
714 const BusProperty
*p
;
715 DBusMessageIter iter
, sub
, sub2
, sub3
;
718 if (!dbus_message_get_args(
721 DBUS_TYPE_STRING
, &interface
,
723 return bus_send_error_reply(m
, message
, &error
, -EINVAL
);
725 if (!(reply
= dbus_message_new_method_return(message
)))
728 dbus_message_iter_init_append(reply
, &iter
);
730 if (!dbus_message_iter_open_container(&iter
, DBUS_TYPE_ARRAY
, "{sv}", &sub
))
733 for (p
= properties
; p
->property
; p
++) {
734 if (!streq(p
->interface
, interface
))
737 if (!dbus_message_iter_open_container(&sub
, DBUS_TYPE_DICT_ENTRY
, NULL
, &sub2
) ||
738 !dbus_message_iter_append_basic(&sub2
, DBUS_TYPE_STRING
, &p
->property
) ||
739 !dbus_message_iter_open_container(&sub2
, DBUS_TYPE_VARIANT
, p
->signature
, &sub3
))
742 if ((r
= p
->append(m
, &sub3
, p
->property
, (void*) p
->data
)) < 0) {
747 dbus_message_unref(reply
);
748 return bus_send_error_reply(m
, message
, NULL
, r
);
751 if (!dbus_message_iter_close_container(&sub2
, &sub3
) ||
752 !dbus_message_iter_close_container(&sub
, &sub2
))
758 if (!dbus_message_iter_close_container(&iter
, &sub
))
763 if (!dbus_connection_send(m
->api_bus
, reply
, NULL
))
766 dbus_message_unref(reply
);
767 return DBUS_HANDLER_RESULT_HANDLED
;
770 return DBUS_HANDLER_RESULT_NOT_YET_HANDLED
;
774 dbus_message_unref(reply
);
776 dbus_error_free(&error
);
778 return DBUS_HANDLER_RESULT_NEED_MEMORY
;
781 static const char *error_to_dbus(int error
) {
786 return DBUS_ERROR_INVALID_ARGS
;
789 return DBUS_ERROR_NO_MEMORY
;
793 return DBUS_ERROR_ACCESS_DENIED
;
796 return DBUS_ERROR_UNIX_PROCESS_ID_UNKNOWN
;
799 return DBUS_ERROR_FILE_NOT_FOUND
;
802 return DBUS_ERROR_FILE_EXISTS
;
805 return DBUS_ERROR_TIMEOUT
;
808 return DBUS_ERROR_IO_ERROR
;
813 return DBUS_ERROR_DISCONNECTED
;
816 return DBUS_ERROR_FAILED
;
819 DBusHandlerResult
bus_send_error_reply(Manager
*m
, DBusMessage
*message
, DBusError
*bus_error
, int error
) {
820 DBusMessage
*reply
= NULL
;
821 const char *name
, *text
;
823 if (bus_error
&& dbus_error_is_set(bus_error
)) {
824 name
= bus_error
->name
;
825 text
= bus_error
->message
;
827 name
= error_to_dbus(error
);
828 text
= strerror(-error
);
831 if (!(reply
= dbus_message_new_error(message
, name
, text
)))
834 if (!dbus_connection_send(m
->api_bus
, reply
, NULL
))
837 dbus_message_unref(reply
);
840 dbus_error_free(bus_error
);
842 return DBUS_HANDLER_RESULT_HANDLED
;
846 dbus_message_unref(reply
);
849 dbus_error_free(bus_error
);
851 return DBUS_HANDLER_RESULT_NEED_MEMORY
;
854 int bus_property_append_string(Manager
*m
, DBusMessageIter
*i
, const char *property
, void *data
) {
855 const char *t
= data
;
864 if (!dbus_message_iter_append_basic(i
, DBUS_TYPE_STRING
, &t
))
870 int bus_property_append_strv(Manager
*m
, DBusMessageIter
*i
, const char *property
, void *data
) {
878 if (!dbus_message_iter_open_container(i
, DBUS_TYPE_ARRAY
, "s", &sub
))
882 if (!dbus_message_iter_append_basic(&sub
, DBUS_TYPE_STRING
, t
))
885 if (!dbus_message_iter_close_container(i
, &sub
))
891 int bus_property_append_bool(Manager
*m
, DBusMessageIter
*i
, const char *property
, void *data
) {
902 if (!dbus_message_iter_append_basic(i
, DBUS_TYPE_BOOLEAN
, &db
))
908 int bus_property_append_uint64(Manager
*m
, DBusMessageIter
*i
, const char *property
, void *data
) {
914 if (!dbus_message_iter_append_basic(i
, DBUS_TYPE_UINT64
, data
))
920 int bus_property_append_uint32(Manager
*m
, DBusMessageIter
*i
, const char *property
, void *data
) {
926 if (!dbus_message_iter_append_basic(i
, DBUS_TYPE_UINT32
, data
))