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>
33 static void bus_dispatch_status(DBusConnection
*bus
, DBusDispatchStatus status
, void *data
) {
39 m
->request_bus_dispatch
= status
!= DBUS_DISPATCH_COMPLETE
;
42 static uint32_t bus_flags_to_events(DBusWatch
*bus_watch
) {
48 /* no watch flags for disabled watches */
49 if (!dbus_watch_get_enabled(bus_watch
))
52 flags
= dbus_watch_get_flags(bus_watch
);
54 if (flags
& DBUS_WATCH_READABLE
)
56 if (flags
& DBUS_WATCH_WRITABLE
)
59 return events
| EPOLLHUP
| EPOLLERR
;
62 static unsigned events_to_bus_flags(uint32_t events
) {
66 flags
|= DBUS_WATCH_READABLE
;
67 if (events
& EPOLLOUT
)
68 flags
|= DBUS_WATCH_WRITABLE
;
69 if (events
& EPOLLHUP
)
70 flags
|= DBUS_WATCH_HANGUP
;
71 if (events
& EPOLLERR
)
72 flags
|= DBUS_WATCH_ERROR
;
77 void bus_watch_event(Manager
*m
, Watch
*w
, int events
) {
81 /* This is called by the event loop whenever there is
82 * something happening on D-Bus' file handles. */
84 if (!(dbus_watch_get_enabled(w
->data
.bus_watch
)))
87 dbus_watch_handle(w
->data
.bus_watch
, events_to_bus_flags(events
));
90 static dbus_bool_t
bus_add_watch(DBusWatch
*bus_watch
, void *data
) {
93 struct epoll_event ev
;
98 if (!(w
= new0(Watch
, 1)))
101 w
->fd
= dbus_watch_get_unix_fd(bus_watch
);
102 w
->type
= WATCH_DBUS_WATCH
;
103 w
->data
.bus_watch
= bus_watch
;
106 ev
.events
= bus_flags_to_events(bus_watch
);
109 if (epoll_ctl(m
->epoll_fd
, EPOLL_CTL_ADD
, w
->fd
, &ev
) < 0) {
111 if (errno
!= EEXIST
) {
116 /* Hmm, bloody D-Bus creates multiple watches on the
117 * same fd. epoll() does not like that. As a dirty
118 * hack we simply dup() the fd and hence get a second
119 * one we can safely add to the epoll(). */
121 if ((w
->fd
= dup(w
->fd
)) < 0) {
126 if (epoll_ctl(m
->epoll_fd
, EPOLL_CTL_ADD
, w
->fd
, &ev
) < 0) {
128 close_nointr_nofail(w
->fd
);
132 w
->fd_is_dupped
= true;
135 dbus_watch_set_data(bus_watch
, w
, NULL
);
140 static void bus_remove_watch(DBusWatch
*bus_watch
, void *data
) {
147 if (!(w
= dbus_watch_get_data(bus_watch
)))
150 assert(w
->type
== WATCH_DBUS_WATCH
);
151 assert_se(epoll_ctl(m
->epoll_fd
, EPOLL_CTL_DEL
, w
->fd
, NULL
) >= 0);
154 close_nointr_nofail(w
->fd
);
159 static void bus_toggle_watch(DBusWatch
*bus_watch
, void *data
) {
162 struct epoll_event ev
;
167 assert_se(w
= dbus_watch_get_data(bus_watch
));
168 assert(w
->type
== WATCH_DBUS_WATCH
);
171 ev
.events
= bus_flags_to_events(bus_watch
);
174 assert_se(epoll_ctl(m
->epoll_fd
, EPOLL_CTL_MOD
, w
->fd
, &ev
) == 0);
177 static int bus_timeout_arm(Manager
*m
, Watch
*w
) {
178 struct itimerspec its
;
185 if (dbus_timeout_get_enabled(w
->data
.bus_timeout
)) {
186 timespec_store(&its
.it_value
, dbus_timeout_get_interval(w
->data
.bus_timeout
) * USEC_PER_MSEC
);
187 its
.it_interval
= its
.it_interval
;
190 if (timerfd_settime(w
->fd
, 0, &its
, NULL
) < 0)
196 void bus_timeout_event(Manager
*m
, Watch
*w
, int events
) {
200 /* This is called by the event loop whenever there is
201 * something happening on D-Bus' file handles. */
203 if (!(dbus_timeout_get_enabled(w
->data
.bus_timeout
)))
206 dbus_timeout_handle(w
->data
.bus_timeout
);
209 static dbus_bool_t
bus_add_timeout(DBusTimeout
*timeout
, void *data
) {
212 struct epoll_event ev
;
217 if (!(w
= new0(Watch
, 1)))
220 if (!(w
->fd
= timerfd_create(CLOCK_MONOTONIC
, TFD_NONBLOCK
|TFD_CLOEXEC
)) < 0)
223 w
->type
= WATCH_DBUS_TIMEOUT
;
224 w
->data
.bus_timeout
= timeout
;
226 if (bus_timeout_arm(m
, w
) < 0)
233 if (epoll_ctl(m
->epoll_fd
, EPOLL_CTL_ADD
, w
->fd
, &ev
) < 0)
236 dbus_timeout_set_data(timeout
, w
, NULL
);
242 close_nointr_nofail(w
->fd
);
248 static void bus_remove_timeout(DBusTimeout
*timeout
, void *data
) {
255 if (!(w
= dbus_timeout_get_data(timeout
)))
258 assert(w
->type
== WATCH_DBUS_TIMEOUT
);
259 assert_se(epoll_ctl(m
->epoll_fd
, EPOLL_CTL_DEL
, w
->fd
, NULL
) >= 0);
260 close_nointr_nofail(w
->fd
);
264 static void bus_toggle_timeout(DBusTimeout
*timeout
, void *data
) {
272 assert_se(w
= dbus_timeout_get_data(timeout
));
273 assert(w
->type
== WATCH_DBUS_TIMEOUT
);
275 if ((r
= bus_timeout_arm(m
, w
)) < 0)
276 log_error("Failed to rearm timer: %s", strerror(-r
));
279 static DBusHandlerResult
bus_message_filter(DBusConnection
*connection
, DBusMessage
*message
, void *data
) {
287 dbus_error_init(&error
);
289 /* log_debug("Got D-Bus request: %s.%s() on %s", */
290 /* dbus_message_get_interface(message), */
291 /* dbus_message_get_member(message), */
292 /* dbus_message_get_path(message)); */
294 if (dbus_message_is_signal(message
, DBUS_INTERFACE_LOCAL
, "Disconnected")) {
295 log_error("Warning! D-Bus connection terminated.");
297 /* FIXME: we probably should restart D-Bus here */
299 } else if (dbus_message_is_signal(message
, DBUS_INTERFACE_DBUS
, "NameOwnerChanged")) {
300 const char *name
, *old
, *new;
302 if (!dbus_message_get_args(message
, &error
,
303 DBUS_TYPE_STRING
, &name
,
304 DBUS_TYPE_STRING
, &old
,
305 DBUS_TYPE_STRING
, &new,
307 log_error("Failed to parse NameOwnerChanged message: %s", error
.message
);
309 if (set_remove(m
->subscribed
, (char*) name
))
310 log_debug("Subscription client vanished: %s (left: %u)", name
, set_size(m
->subscribed
));
314 dbus_error_free(&error
);
315 return DBUS_HANDLER_RESULT_NOT_YET_HANDLED
;
318 unsigned bus_dispatch(Manager
*m
) {
321 if (!m
->request_bus_dispatch
)
324 if (dbus_connection_dispatch(m
->bus
) == DBUS_DISPATCH_COMPLETE
)
325 m
->request_bus_dispatch
= false;
330 static int request_name(Manager
*m
) {
331 DBusMessage
*message
;
332 const char *name
= "org.freedesktop.systemd1";
335 if (!(message
= dbus_message_new_method_call(
342 if (!dbus_message_append_args(
344 DBUS_TYPE_STRING
, &name
,
345 DBUS_TYPE_UINT32
, &flags
,
346 DBUS_TYPE_INVALID
)) {
347 dbus_message_unref(message
);
351 if (!dbus_connection_send(m
->bus
, message
, NULL
)) {
352 dbus_message_unref(message
);
356 /* We simple ask for the name and don't wait for it. Sooner or
357 * later we'll have it, and we wouldn't know what to do on
360 dbus_message_unref(message
);
365 int bus_init(Manager
*m
) {
375 if (!(m
->subscribed
= set_new(string_hash_func
, string_compare_func
)))
378 dbus_connection_set_change_sigpipe(FALSE
);
380 dbus_error_init(&error
);
381 if (!(m
->bus
= dbus_bus_get_private(m
->is_init
? DBUS_BUS_SYSTEM
: DBUS_BUS_SESSION
, &error
))) {
382 log_error("Failed to get D-Bus connection: %s", error
.message
);
383 dbus_error_free(&error
);
384 return -ECONNREFUSED
;
387 dbus_connection_set_exit_on_disconnect(m
->bus
, FALSE
);
388 dbus_connection_set_dispatch_status_function(m
->bus
, bus_dispatch_status
, m
, NULL
);
389 if (!dbus_connection_set_watch_functions(m
->bus
, bus_add_watch
, bus_remove_watch
, bus_toggle_watch
, m
, NULL
) ||
390 !dbus_connection_set_timeout_functions(m
->bus
, bus_add_timeout
, bus_remove_timeout
, bus_toggle_timeout
, m
, NULL
) ||
391 !dbus_connection_register_object_path(m
->bus
, "/org/freedesktop/systemd1", &bus_manager_vtable
, m
) ||
392 !dbus_connection_register_fallback(m
->bus
, "/org/freedesktop/systemd1/unit", &bus_unit_vtable
, m
) ||
393 !dbus_connection_register_fallback(m
->bus
, "/org/freedesktop/systemd1/job", &bus_job_vtable
, m
) ||
394 !dbus_connection_add_filter(m
->bus
, bus_message_filter
, m
, NULL
)) {
399 dbus_bus_add_match(m
->bus
,
401 "sender='"DBUS_SERVICE_DBUS
"',"
402 "interface='"DBUS_INTERFACE_DBUS
"',"
403 "path='"DBUS_PATH_DBUS
"'",
406 if (dbus_error_is_set(&error
)) {
407 log_error("Failed to register match: %s", error
.message
);
408 dbus_error_free(&error
);
413 if ((r
= request_name(m
)) < 0) {
418 log_debug("Successfully connected to D-Bus bus %s as %s",
419 strnull((id
= dbus_connection_get_server_id(m
->bus
))),
420 strnull(dbus_bus_get_unique_name(m
->bus
)));
423 m
->request_bus_dispatch
= true;
428 void bus_done(Manager
*m
) {
432 dbus_connection_close(m
->bus
);
433 dbus_connection_unref(m
->bus
);
440 while ((c
= set_steal_first(m
->subscribed
)))
443 set_free(m
->subscribed
);
444 m
->subscribed
= NULL
;
448 DBusHandlerResult
bus_default_message_handler(Manager
*m
, DBusMessage
*message
, const char*introspection
, const BusProperty
*properties
) {
450 DBusMessage
*reply
= NULL
;
456 dbus_error_init(&error
);
458 if (dbus_message_is_method_call(message
, "org.freedesktop.DBus.Introspectable", "Introspect") && introspection
) {
460 if (!(reply
= dbus_message_new_method_return(message
)))
463 if (!dbus_message_append_args(reply
, DBUS_TYPE_STRING
, &introspection
, DBUS_TYPE_INVALID
))
466 } else if (dbus_message_is_method_call(message
, "org.freedesktop.DBus.Properties", "Get") && properties
) {
467 const char *interface
, *property
;
468 const BusProperty
*p
;
470 if (!dbus_message_get_args(
473 DBUS_TYPE_STRING
, &interface
,
474 DBUS_TYPE_STRING
, &property
,
476 return bus_send_error_reply(m
, message
, &error
, -EINVAL
);
478 for (p
= properties
; p
->property
; p
++)
479 if (streq(p
->interface
, interface
) && streq(p
->property
, property
))
483 DBusMessageIter iter
, sub
;
485 if (!(reply
= dbus_message_new_method_return(message
)))
488 dbus_message_iter_init_append(reply
, &iter
);
490 if (!dbus_message_iter_open_container(&iter
, DBUS_TYPE_VARIANT
, p
->signature
, &sub
))
493 if ((r
= p
->append(m
, &sub
, property
, p
->data
)) < 0) {
498 dbus_message_unref(reply
);
499 return bus_send_error_reply(m
, message
, NULL
, r
);
502 if (!dbus_message_iter_close_container(&iter
, &sub
))
505 } else if (dbus_message_is_method_call(message
, "org.freedesktop.DBus.Properties", "GetAll") && properties
) {
506 const char *interface
;
507 const BusProperty
*p
;
508 DBusMessageIter iter
, sub
, sub2
, sub3
;
511 if (!dbus_message_get_args(
514 DBUS_TYPE_STRING
, &interface
,
516 return bus_send_error_reply(m
, message
, &error
, -EINVAL
);
518 if (!(reply
= dbus_message_new_method_return(message
)))
521 dbus_message_iter_init_append(reply
, &iter
);
523 if (!dbus_message_iter_open_container(&iter
, DBUS_TYPE_ARRAY
, "{sv}", &sub
))
526 for (p
= properties
; p
->property
; p
++) {
527 if (!streq(p
->interface
, interface
))
530 if (!dbus_message_iter_open_container(&sub
, DBUS_TYPE_DICT_ENTRY
, NULL
, &sub2
) ||
531 !dbus_message_iter_append_basic(&sub2
, DBUS_TYPE_STRING
, &p
->property
) ||
532 !dbus_message_iter_open_container(&sub2
, DBUS_TYPE_VARIANT
, p
->signature
, &sub3
))
535 if ((r
= p
->append(m
, &sub3
, p
->property
, p
->data
)) < 0) {
540 dbus_message_unref(reply
);
541 return bus_send_error_reply(m
, message
, NULL
, r
);
544 if (!dbus_message_iter_close_container(&sub2
, &sub3
) ||
545 !dbus_message_iter_close_container(&sub
, &sub2
))
551 if (!dbus_message_iter_close_container(&iter
, &sub
))
556 if (!dbus_connection_send(m
->bus
, reply
, NULL
))
559 dbus_message_unref(reply
);
560 return DBUS_HANDLER_RESULT_HANDLED
;
563 return DBUS_HANDLER_RESULT_NOT_YET_HANDLED
;
567 dbus_message_unref(reply
);
569 dbus_error_free(&error
);
571 return DBUS_HANDLER_RESULT_NEED_MEMORY
;
576 static const char *error_to_dbus(int error
) {
581 return DBUS_ERROR_INVALID_ARGS
;
584 return DBUS_ERROR_NO_MEMORY
;
588 return DBUS_ERROR_ACCESS_DENIED
;
591 return DBUS_ERROR_UNIX_PROCESS_ID_UNKNOWN
;
594 return DBUS_ERROR_FILE_NOT_FOUND
;
597 return DBUS_ERROR_FILE_EXISTS
;
600 return DBUS_ERROR_TIMEOUT
;
603 return DBUS_ERROR_IO_ERROR
;
608 return DBUS_ERROR_DISCONNECTED
;
611 return DBUS_ERROR_FAILED
;
614 DBusHandlerResult
bus_send_error_reply(Manager
*m
, DBusMessage
*message
, DBusError
*bus_error
, int error
) {
615 DBusMessage
*reply
= NULL
;
616 const char *name
, *text
;
618 if (bus_error
&& dbus_error_is_set(bus_error
)) {
619 name
= bus_error
->name
;
620 text
= bus_error
->message
;
622 name
= error_to_dbus(error
);
623 text
= strerror(-error
);
626 if (!(reply
= dbus_message_new_error(message
, name
, text
)))
629 if (!dbus_connection_send(m
->bus
, reply
, NULL
))
632 dbus_message_unref(reply
);
635 dbus_error_free(bus_error
);
637 return DBUS_HANDLER_RESULT_HANDLED
;
641 dbus_message_unref(reply
);
644 dbus_error_free(bus_error
);
646 return DBUS_HANDLER_RESULT_NEED_MEMORY
;
649 int bus_property_append_string(Manager
*m
, DBusMessageIter
*i
, const char *property
, void *data
) {
650 const char *t
= data
;
659 if (!dbus_message_iter_append_basic(i
, DBUS_TYPE_STRING
, &t
))
665 int bus_property_append_strv(Manager
*m
, DBusMessageIter
*i
, const char *property
, void *data
) {
673 if (!dbus_message_iter_open_container(i
, DBUS_TYPE_ARRAY
, "s", &sub
))
677 if (!dbus_message_iter_append_basic(&sub
, DBUS_TYPE_STRING
, t
))
680 if (!dbus_message_iter_close_container(i
, &sub
))
686 int bus_property_append_bool(Manager
*m
, DBusMessageIter
*i
, const char *property
, void *data
) {
697 if (!dbus_message_iter_append_basic(i
, DBUS_TYPE_BOOLEAN
, &db
))
703 int bus_property_append_uint64(Manager
*m
, DBusMessageIter
*i
, const char *property
, void *data
) {
709 if (!dbus_message_iter_append_basic(i
, DBUS_TYPE_UINT64
, data
))
715 int bus_property_append_uint32(Manager
*m
, DBusMessageIter
*i
, const char *property
, void *data
) {
721 if (!dbus_message_iter_append_basic(i
, DBUS_TYPE_UINT32
, data
))