1 /*
2 *
3 * D-Bus helper library
4 *
5 * Copyright (C) 2004-2011 Marcel Holtmann <marcel@holtmann.org>
6 *
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it 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 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
21 *
22 */
23
24 #ifdef HAVE_CONFIG_H
25 #include <config.h>
26 #endif
27
28 #include <glib.h>
29 #include <dbus/dbus.h>
30
31 #ifdef NEED_DBUS_WATCH_GET_UNIX_FD
32 #define dbus_watch_get_unix_fd dbus_watch_get_fd
33 #endif
34
35 #include "gdbus.h"
36
37 #define DISPATCH_TIMEOUT 0
38
39 #define info(fmt...)
40 #define error(fmt...)
41 #define debug(fmt...)
42
43 struct timeout_handler {
44 guint id;
45 DBusTimeout *timeout;
46 };
47
48 struct watch_info {
49 guint id;
50 DBusWatch *watch;
51 DBusConnection *conn;
52 };
53
54 struct disconnect_data {
55 GDBusWatchFunction function;
56 void *user_data;
57 };
58
disconnected_signal(DBusConnection * conn,DBusMessage * msg,void * data)59 static gboolean disconnected_signal(DBusConnection *conn,
60 DBusMessage *msg, void *data)
61 {
62 struct disconnect_data *dc_data = data;
63
64 error("Got disconnected from the system message bus");
65
66 dc_data->function(conn, dc_data->user_data);
67
68 dbus_connection_unref(conn);
69
70 return TRUE;
71 }
72
message_dispatch(void * data)73 static gboolean message_dispatch(void *data)
74 {
75 DBusConnection *conn = data;
76
77 dbus_connection_ref(conn);
78
79 /* Dispatch messages */
80 while (dbus_connection_dispatch(conn) == DBUS_DISPATCH_DATA_REMAINS);
81
82 dbus_connection_unref(conn);
83
84 return FALSE;
85 }
86
queue_dispatch(DBusConnection * conn,DBusDispatchStatus status)87 static inline void queue_dispatch(DBusConnection *conn,
88 DBusDispatchStatus status)
89 {
90 if (status == DBUS_DISPATCH_DATA_REMAINS)
91 g_timeout_add(DISPATCH_TIMEOUT, message_dispatch, conn);
92 }
93
watch_func(GIOChannel * chan,GIOCondition cond,gpointer data)94 static gboolean watch_func(GIOChannel *chan, GIOCondition cond, gpointer data)
95 {
96 struct watch_info *info = data;
97 unsigned int flags = 0;
98 DBusDispatchStatus status;
99
100 dbus_connection_ref(info->conn);
101
102 if (cond & G_IO_IN) flags |= DBUS_WATCH_READABLE;
103 if (cond & G_IO_OUT) flags |= DBUS_WATCH_WRITABLE;
104 if (cond & G_IO_HUP) flags |= DBUS_WATCH_HANGUP;
105 if (cond & G_IO_ERR) flags |= DBUS_WATCH_ERROR;
106
107 dbus_watch_handle(info->watch, flags);
108
109 status = dbus_connection_get_dispatch_status(info->conn);
110 queue_dispatch(info->conn, status);
111
112 dbus_connection_unref(info->conn);
113
114 return TRUE;
115 }
116
watch_info_free(void * data)117 static void watch_info_free(void *data)
118 {
119 struct watch_info *info = data;
120
121 if (info->id > 0) {
122 g_source_remove(info->id);
123 info->id = 0;
124 }
125
126 dbus_connection_unref(info->conn);
127
128 g_free(info);
129 }
130
add_watch(DBusWatch * watch,void * data)131 static dbus_bool_t add_watch(DBusWatch *watch, void *data)
132 {
133 DBusConnection *conn = data;
134 GIOCondition cond = G_IO_HUP | G_IO_ERR;
135 GIOChannel *chan;
136 struct watch_info *info;
137 unsigned int flags;
138 int fd;
139
140 if (!dbus_watch_get_enabled(watch))
141 return TRUE;
142
143 info = g_new0(struct watch_info, 1);
144
145 fd = dbus_watch_get_unix_fd(watch);
146 chan = g_io_channel_unix_new(fd);
147
148 info->watch = watch;
149 info->conn = dbus_connection_ref(conn);
150
151 dbus_watch_set_data(watch, info, watch_info_free);
152
153 flags = dbus_watch_get_flags(watch);
154
155 if (flags & DBUS_WATCH_READABLE) cond |= G_IO_IN;
156 if (flags & DBUS_WATCH_WRITABLE) cond |= G_IO_OUT;
157
158 info->id = g_io_add_watch(chan, cond, watch_func, info);
159
160 g_io_channel_unref(chan);
161
162 return TRUE;
163 }
164
remove_watch(DBusWatch * watch,void * data)165 static void remove_watch(DBusWatch *watch, void *data)
166 {
167 if (dbus_watch_get_enabled(watch))
168 return;
169
170 /* will trigger watch_info_free() */
171 dbus_watch_set_data(watch, NULL, NULL);
172 }
173
watch_toggled(DBusWatch * watch,void * data)174 static void watch_toggled(DBusWatch *watch, void *data)
175 {
176 /* Because we just exit on OOM, enable/disable is
177 * no different from add/remove */
178 if (dbus_watch_get_enabled(watch))
179 add_watch(watch, data);
180 else
181 remove_watch(watch, data);
182 }
183
timeout_handler_dispatch(gpointer data)184 static gboolean timeout_handler_dispatch(gpointer data)
185 {
186 struct timeout_handler *handler = data;
187
188 handler->id = 0;
189
190 /* if not enabled should not be polled by the main loop */
191 if (!dbus_timeout_get_enabled(handler->timeout))
192 return FALSE;
193
194 dbus_timeout_handle(handler->timeout);
195
196 return FALSE;
197 }
198
timeout_handler_free(void * data)199 static void timeout_handler_free(void *data)
200 {
201 struct timeout_handler *handler = data;
202
203 if (handler->id > 0) {
204 g_source_remove(handler->id);
205 handler->id = 0;
206 }
207
208 g_free(handler);
209 }
210
add_timeout(DBusTimeout * timeout,void * data)211 static dbus_bool_t add_timeout(DBusTimeout *timeout, void *data)
212 {
213 int interval = dbus_timeout_get_interval(timeout);
214 struct timeout_handler *handler;
215
216 if (!dbus_timeout_get_enabled(timeout))
217 return TRUE;
218
219 handler = g_new0(struct timeout_handler, 1);
220
221 handler->timeout = timeout;
222
223 dbus_timeout_set_data(timeout, handler, timeout_handler_free);
224
225 handler->id = g_timeout_add(interval, timeout_handler_dispatch,
226 handler);
227
228 return TRUE;
229 }
230
remove_timeout(DBusTimeout * timeout,void * data)231 static void remove_timeout(DBusTimeout *timeout, void *data)
232 {
233 /* will trigger timeout_handler_free() */
234 dbus_timeout_set_data(timeout, NULL, NULL);
235 }
236
timeout_toggled(DBusTimeout * timeout,void * data)237 static void timeout_toggled(DBusTimeout *timeout, void *data)
238 {
239 if (dbus_timeout_get_enabled(timeout))
240 add_timeout(timeout, data);
241 else
242 remove_timeout(timeout, data);
243 }
244
dispatch_status(DBusConnection * conn,DBusDispatchStatus status,void * data)245 static void dispatch_status(DBusConnection *conn,
246 DBusDispatchStatus status, void *data)
247 {
248 if (!dbus_connection_get_is_connected(conn))
249 return;
250
251 queue_dispatch(conn, status);
252 }
253
setup_dbus_with_main_loop(DBusConnection * conn)254 static inline void setup_dbus_with_main_loop(DBusConnection *conn)
255 {
256 dbus_connection_set_watch_functions(conn, add_watch, remove_watch,
257 watch_toggled, conn, NULL);
258
259 dbus_connection_set_timeout_functions(conn, add_timeout, remove_timeout,
260 timeout_toggled, NULL, NULL);
261
262 dbus_connection_set_dispatch_status_function(conn, dispatch_status,
263 NULL, NULL);
264 }
265
setup_bus(DBusConnection * conn,const char * name,DBusError * error)266 static gboolean setup_bus(DBusConnection *conn, const char *name,
267 DBusError *error)
268 {
269 gboolean result;
270 DBusDispatchStatus status;
271
272 if (name != NULL) {
273 result = g_dbus_request_name(conn, name, error);
274
275 if (error != NULL) {
276 if (dbus_error_is_set(error) == TRUE)
277 return FALSE;
278 }
279
280 if (result == FALSE)
281 return FALSE;
282 }
283
284 setup_dbus_with_main_loop(conn);
285
286 status = dbus_connection_get_dispatch_status(conn);
287 queue_dispatch(conn, status);
288
289 return TRUE;
290 }
291
g_dbus_setup_bus(DBusBusType type,const char * name,DBusError * error)292 DBusConnection *g_dbus_setup_bus(DBusBusType type, const char *name,
293 DBusError *error)
294 {
295 DBusConnection *conn;
296
297 conn = dbus_bus_get(type, error);
298
299 if (error != NULL) {
300 if (dbus_error_is_set(error) == TRUE)
301 return NULL;
302 }
303
304 if (conn == NULL)
305 return NULL;
306
307 if (setup_bus(conn, name, error) == FALSE) {
308 dbus_connection_unref(conn);
309 return NULL;
310 }
311
312 return conn;
313 }
314
g_dbus_setup_private(DBusBusType type,const char * name,DBusError * error)315 DBusConnection *g_dbus_setup_private(DBusBusType type, const char *name,
316 DBusError *error)
317 {
318 DBusConnection *conn;
319
320 conn = dbus_bus_get_private(type, error);
321
322 if (error != NULL) {
323 if (dbus_error_is_set(error) == TRUE)
324 return NULL;
325 }
326
327 if (conn == NULL)
328 return NULL;
329
330 if (setup_bus(conn, name, error) == FALSE) {
331 dbus_connection_unref(conn);
332 return NULL;
333 }
334
335 return conn;
336 }
337
g_dbus_request_name(DBusConnection * connection,const char * name,DBusError * error)338 gboolean g_dbus_request_name(DBusConnection *connection, const char *name,
339 DBusError *error)
340 {
341 int result;
342
343 result = dbus_bus_request_name(connection, name,
344 DBUS_NAME_FLAG_DO_NOT_QUEUE, error);
345
346 if (error != NULL) {
347 if (dbus_error_is_set(error) == TRUE)
348 return FALSE;
349 }
350
351 if (result != DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER) {
352 if (error != NULL)
353 dbus_set_error(error, name, "Name already in use");
354
355 return FALSE;
356 }
357
358 return TRUE;
359 }
360
g_dbus_set_disconnect_function(DBusConnection * connection,GDBusWatchFunction function,void * user_data,DBusFreeFunction destroy)361 gboolean g_dbus_set_disconnect_function(DBusConnection *connection,
362 GDBusWatchFunction function,
363 void *user_data, DBusFreeFunction destroy)
364 {
365 struct disconnect_data *dc_data;
366
367 dc_data = g_new0(struct disconnect_data, 1);
368
369 dc_data->function = function;
370 dc_data->user_data = user_data;
371
372 dbus_connection_set_exit_on_disconnect(connection, FALSE);
373
374 if (g_dbus_add_signal_watch(connection, NULL, NULL,
375 DBUS_INTERFACE_LOCAL, "Disconnected",
376 disconnected_signal, dc_data, g_free) == 0) {
377 error("Failed to add watch for D-Bus Disconnected signal");
378 g_free(dc_data);
379 return FALSE;
380 }
381
382 return TRUE;
383 }
384