1 /* GDBus - GLib D-Bus Library
2 *
3 * Copyright (C) 2008-2010 Red Hat, Inc.
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2.1 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
14 *
15 * You should have received a copy of the GNU Lesser General
16 * Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
17 *
18 * Author: David Zeuthen <davidz@redhat.com>
19 */
20
21 #include "config.h"
22
23 #include <stdlib.h>
24 #include <string.h>
25 #include <errno.h>
26
27 #include "giotypes.h"
28 #include "gioerror.h"
29 #include "gdbusaddress.h"
30 #include "gdbusutils.h"
31 #include "gdbusconnection.h"
32 #include "gdbusserver.h"
33 #include "gioenumtypes.h"
34 #include "gdbusprivate.h"
35 #include "gdbusauthobserver.h"
36 #include "ginitable.h"
37 #include "gsocketservice.h"
38 #include "gthreadedsocketservice.h"
39 #include "gresolver.h"
40 #include "glib/gstdio.h"
41 #include "ginetaddress.h"
42 #include "ginetsocketaddress.h"
43 #include "ginputstream.h"
44 #include "giostream.h"
45 #include "gmarshal-internal.h"
46
47 #ifdef G_OS_UNIX
48 #include <unistd.h>
49 #endif
50 #ifdef G_OS_WIN32
51 #include <io.h>
52 #endif
53
54 #ifdef G_OS_UNIX
55 #include "gunixsocketaddress.h"
56 #endif
57
58 #include "glibintl.h"
59
60 #define G_DBUS_SERVER_FLAGS_ALL \
61 (G_DBUS_SERVER_FLAGS_RUN_IN_THREAD | \
62 G_DBUS_SERVER_FLAGS_AUTHENTICATION_ALLOW_ANONYMOUS | \
63 G_DBUS_SERVER_FLAGS_AUTHENTICATION_REQUIRE_SAME_USER)
64
65 /**
66 * SECTION:gdbusserver
67 * @short_description: Helper for accepting connections
68 * @include: gio/gio.h
69 *
70 * #GDBusServer is a helper for listening to and accepting D-Bus
71 * connections. This can be used to create a new D-Bus server, allowing two
72 * peers to use the D-Bus protocol for their own specialized communication.
73 * A server instance provided in this way will not perform message routing or
74 * implement the org.freedesktop.DBus interface.
75 *
76 * To just export an object on a well-known name on a message bus, such as the
77 * session or system bus, you should instead use g_bus_own_name().
78 *
79 * An example of peer-to-peer communication with GDBus can be found
80 * in [gdbus-example-peer.c](https://git.gnome.org/browse/glib/tree/gio/tests/gdbus-example-peer.c).
81 *
82 * Note that a minimal #GDBusServer will accept connections from any
83 * peer. In many use-cases it will be necessary to add a #GDBusAuthObserver
84 * that only accepts connections that have successfully authenticated
85 * as the same user that is running the #GDBusServer. Since GLib 2.68 this can
86 * be achieved more simply by passing the
87 * %G_DBUS_SERVER_FLAGS_AUTHENTICATION_REQUIRE_SAME_USER flag to the server.
88 */
89
90 /**
91 * GDBusServer:
92 *
93 * The #GDBusServer structure contains only private data and
94 * should only be accessed using the provided API.
95 *
96 * Since: 2.26
97 */
98 struct _GDBusServer
99 {
100 /*< private >*/
101 GObject parent_instance;
102
103 GDBusServerFlags flags;
104 gchar *address;
105 gchar *guid;
106
107 guchar *nonce;
108 gchar *nonce_file;
109
110 gchar *client_address;
111
112 gchar *unix_socket_path;
113 GSocketListener *listener;
114 gboolean is_using_listener;
115 gulong run_signal_handler_id;
116
117 /* The result of g_main_context_ref_thread_default() when the object
118 * was created (the GObject _init() function) - this is used for delivery
119 * of the :new-connection GObject signal.
120 */
121 GMainContext *main_context_at_construction;
122
123 gboolean active;
124
125 GDBusAuthObserver *authentication_observer;
126 };
127
128 typedef struct _GDBusServerClass GDBusServerClass;
129
130 /**
131 * GDBusServerClass:
132 * @new_connection: Signal class handler for the #GDBusServer::new-connection signal.
133 *
134 * Class structure for #GDBusServer.
135 *
136 * Since: 2.26
137 */
138 struct _GDBusServerClass
139 {
140 /*< private >*/
141 GObjectClass parent_class;
142
143 /*< public >*/
144 /* Signals */
145 gboolean (*new_connection) (GDBusServer *server,
146 GDBusConnection *connection);
147 };
148
149 enum
150 {
151 PROP_0,
152 PROP_ADDRESS,
153 PROP_CLIENT_ADDRESS,
154 PROP_FLAGS,
155 PROP_GUID,
156 PROP_ACTIVE,
157 PROP_AUTHENTICATION_OBSERVER,
158 };
159
160 enum
161 {
162 NEW_CONNECTION_SIGNAL,
163 LAST_SIGNAL,
164 };
165
166 static guint _signals[LAST_SIGNAL] = {0};
167
168 static void initable_iface_init (GInitableIface *initable_iface);
169
G_DEFINE_TYPE_WITH_CODE(GDBusServer,g_dbus_server,G_TYPE_OBJECT,G_IMPLEMENT_INTERFACE (G_TYPE_INITABLE,initable_iface_init))170 G_DEFINE_TYPE_WITH_CODE (GDBusServer, g_dbus_server, G_TYPE_OBJECT,
171 G_IMPLEMENT_INTERFACE (G_TYPE_INITABLE, initable_iface_init))
172
173 static void
174 g_dbus_server_dispose (GObject *object)
175 {
176 GDBusServer *server = G_DBUS_SERVER (object);
177
178 if (server->active)
179 g_dbus_server_stop (server);
180
181 G_OBJECT_CLASS (g_dbus_server_parent_class)->dispose (object);
182 }
183
184 static void
g_dbus_server_finalize(GObject * object)185 g_dbus_server_finalize (GObject *object)
186 {
187 GDBusServer *server = G_DBUS_SERVER (object);
188
189 g_assert (!server->active);
190
191 if (server->authentication_observer != NULL)
192 g_object_unref (server->authentication_observer);
193
194 if (server->run_signal_handler_id > 0)
195 g_signal_handler_disconnect (server->listener, server->run_signal_handler_id);
196
197 if (server->listener != NULL)
198 g_object_unref (server->listener);
199
200 g_free (server->address);
201 g_free (server->guid);
202 g_free (server->client_address);
203 if (server->nonce != NULL)
204 {
205 memset (server->nonce, '\0', 16);
206 g_free (server->nonce);
207 }
208
209 g_free (server->unix_socket_path);
210 g_free (server->nonce_file);
211
212 g_main_context_unref (server->main_context_at_construction);
213
214 G_OBJECT_CLASS (g_dbus_server_parent_class)->finalize (object);
215 }
216
217 static void
g_dbus_server_get_property(GObject * object,guint prop_id,GValue * value,GParamSpec * pspec)218 g_dbus_server_get_property (GObject *object,
219 guint prop_id,
220 GValue *value,
221 GParamSpec *pspec)
222 {
223 GDBusServer *server = G_DBUS_SERVER (object);
224
225 switch (prop_id)
226 {
227 case PROP_FLAGS:
228 g_value_set_flags (value, server->flags);
229 break;
230
231 case PROP_GUID:
232 g_value_set_string (value, server->guid);
233 break;
234
235 case PROP_ADDRESS:
236 g_value_set_string (value, server->address);
237 break;
238
239 case PROP_CLIENT_ADDRESS:
240 g_value_set_string (value, server->client_address);
241 break;
242
243 case PROP_ACTIVE:
244 g_value_set_boolean (value, server->active);
245 break;
246
247 case PROP_AUTHENTICATION_OBSERVER:
248 g_value_set_object (value, server->authentication_observer);
249 break;
250
251 default:
252 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
253 break;
254 }
255 }
256
257 static void
g_dbus_server_set_property(GObject * object,guint prop_id,const GValue * value,GParamSpec * pspec)258 g_dbus_server_set_property (GObject *object,
259 guint prop_id,
260 const GValue *value,
261 GParamSpec *pspec)
262 {
263 GDBusServer *server = G_DBUS_SERVER (object);
264
265 switch (prop_id)
266 {
267 case PROP_FLAGS:
268 server->flags = g_value_get_flags (value);
269 break;
270
271 case PROP_GUID:
272 server->guid = g_value_dup_string (value);
273 break;
274
275 case PROP_ADDRESS:
276 server->address = g_value_dup_string (value);
277 break;
278
279 case PROP_AUTHENTICATION_OBSERVER:
280 server->authentication_observer = g_value_dup_object (value);
281 break;
282
283 default:
284 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
285 break;
286 }
287 }
288
289 static void
g_dbus_server_class_init(GDBusServerClass * klass)290 g_dbus_server_class_init (GDBusServerClass *klass)
291 {
292 GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
293
294 gobject_class->dispose = g_dbus_server_dispose;
295 gobject_class->finalize = g_dbus_server_finalize;
296 gobject_class->set_property = g_dbus_server_set_property;
297 gobject_class->get_property = g_dbus_server_get_property;
298
299 /**
300 * GDBusServer:flags:
301 *
302 * Flags from the #GDBusServerFlags enumeration.
303 *
304 * Since: 2.26
305 */
306 g_object_class_install_property (gobject_class,
307 PROP_FLAGS,
308 g_param_spec_flags ("flags",
309 P_("Flags"),
310 P_("Flags for the server"),
311 G_TYPE_DBUS_SERVER_FLAGS,
312 G_DBUS_SERVER_FLAGS_NONE,
313 G_PARAM_READABLE |
314 G_PARAM_WRITABLE |
315 G_PARAM_CONSTRUCT_ONLY |
316 G_PARAM_STATIC_NAME |
317 G_PARAM_STATIC_BLURB |
318 G_PARAM_STATIC_NICK));
319
320 /**
321 * GDBusServer:guid:
322 *
323 * The guid of the server.
324 *
325 * Since: 2.26
326 */
327 g_object_class_install_property (gobject_class,
328 PROP_GUID,
329 g_param_spec_string ("guid",
330 P_("GUID"),
331 P_("The guid of the server"),
332 NULL,
333 G_PARAM_READABLE |
334 G_PARAM_WRITABLE |
335 G_PARAM_CONSTRUCT_ONLY |
336 G_PARAM_STATIC_NAME |
337 G_PARAM_STATIC_BLURB |
338 G_PARAM_STATIC_NICK));
339
340 /**
341 * GDBusServer:address:
342 *
343 * The D-Bus address to listen on.
344 *
345 * Since: 2.26
346 */
347 g_object_class_install_property (gobject_class,
348 PROP_ADDRESS,
349 g_param_spec_string ("address",
350 P_("Address"),
351 P_("The address to listen on"),
352 NULL,
353 G_PARAM_READABLE |
354 G_PARAM_WRITABLE |
355 G_PARAM_CONSTRUCT_ONLY |
356 G_PARAM_STATIC_NAME |
357 G_PARAM_STATIC_BLURB |
358 G_PARAM_STATIC_NICK));
359
360 /**
361 * GDBusServer:client-address:
362 *
363 * The D-Bus address that clients can use.
364 *
365 * Since: 2.26
366 */
367 g_object_class_install_property (gobject_class,
368 PROP_CLIENT_ADDRESS,
369 g_param_spec_string ("client-address",
370 P_("Client Address"),
371 P_("The address clients can use"),
372 NULL,
373 G_PARAM_READABLE |
374 G_PARAM_STATIC_NAME |
375 G_PARAM_STATIC_BLURB |
376 G_PARAM_STATIC_NICK));
377
378 /**
379 * GDBusServer:active:
380 *
381 * Whether the server is currently active.
382 *
383 * Since: 2.26
384 */
385 g_object_class_install_property (gobject_class,
386 PROP_ACTIVE,
387 g_param_spec_boolean ("active",
388 P_("Active"),
389 P_("Whether the server is currently active"),
390 FALSE,
391 G_PARAM_READABLE |
392 G_PARAM_STATIC_NAME |
393 G_PARAM_STATIC_BLURB |
394 G_PARAM_STATIC_NICK));
395
396 /**
397 * GDBusServer:authentication-observer:
398 *
399 * A #GDBusAuthObserver object to assist in the authentication process or %NULL.
400 *
401 * Since: 2.26
402 */
403 g_object_class_install_property (gobject_class,
404 PROP_AUTHENTICATION_OBSERVER,
405 g_param_spec_object ("authentication-observer",
406 P_("Authentication Observer"),
407 P_("Object used to assist in the authentication process"),
408 G_TYPE_DBUS_AUTH_OBSERVER,
409 G_PARAM_READABLE |
410 G_PARAM_WRITABLE |
411 G_PARAM_CONSTRUCT_ONLY |
412 G_PARAM_STATIC_NAME |
413 G_PARAM_STATIC_BLURB |
414 G_PARAM_STATIC_NICK));
415
416 /**
417 * GDBusServer::new-connection:
418 * @server: The #GDBusServer emitting the signal.
419 * @connection: A #GDBusConnection for the new connection.
420 *
421 * Emitted when a new authenticated connection has been made. Use
422 * g_dbus_connection_get_peer_credentials() to figure out what
423 * identity (if any), was authenticated.
424 *
425 * If you want to accept the connection, take a reference to the
426 * @connection object and return %TRUE. When you are done with the
427 * connection call g_dbus_connection_close() and give up your
428 * reference. Note that the other peer may disconnect at any time -
429 * a typical thing to do when accepting a connection is to listen to
430 * the #GDBusConnection::closed signal.
431 *
432 * If #GDBusServer:flags contains %G_DBUS_SERVER_FLAGS_RUN_IN_THREAD
433 * then the signal is emitted in a new thread dedicated to the
434 * connection. Otherwise the signal is emitted in the
435 * [thread-default main context][g-main-context-push-thread-default]
436 * of the thread that @server was constructed in.
437 *
438 * You are guaranteed that signal handlers for this signal runs
439 * before incoming messages on @connection are processed. This means
440 * that it's suitable to call g_dbus_connection_register_object() or
441 * similar from the signal handler.
442 *
443 * Returns: %TRUE to claim @connection, %FALSE to let other handlers
444 * run.
445 *
446 * Since: 2.26
447 */
448 _signals[NEW_CONNECTION_SIGNAL] = g_signal_new (I_("new-connection"),
449 G_TYPE_DBUS_SERVER,
450 G_SIGNAL_RUN_LAST,
451 G_STRUCT_OFFSET (GDBusServerClass, new_connection),
452 g_signal_accumulator_true_handled,
453 NULL, /* accu_data */
454 _g_cclosure_marshal_BOOLEAN__OBJECT,
455 G_TYPE_BOOLEAN,
456 1,
457 G_TYPE_DBUS_CONNECTION);
458 g_signal_set_va_marshaller (_signals[NEW_CONNECTION_SIGNAL],
459 G_TYPE_FROM_CLASS (klass),
460 _g_cclosure_marshal_BOOLEAN__OBJECTv);
461 }
462
463 static void
g_dbus_server_init(GDBusServer * server)464 g_dbus_server_init (GDBusServer *server)
465 {
466 server->main_context_at_construction = g_main_context_ref_thread_default ();
467 }
468
469 static gboolean
470 on_run (GSocketService *service,
471 GSocketConnection *socket_connection,
472 GObject *source_object,
473 gpointer user_data);
474
475 /**
476 * g_dbus_server_new_sync:
477 * @address: A D-Bus address.
478 * @flags: Flags from the #GDBusServerFlags enumeration.
479 * @guid: A D-Bus GUID.
480 * @observer: (nullable): A #GDBusAuthObserver or %NULL.
481 * @cancellable: (nullable): A #GCancellable or %NULL.
482 * @error: Return location for server or %NULL.
483 *
484 * Creates a new D-Bus server that listens on the first address in
485 * @address that works.
486 *
487 * Once constructed, you can use g_dbus_server_get_client_address() to
488 * get a D-Bus address string that clients can use to connect.
489 *
490 * To have control over the available authentication mechanisms and
491 * the users that are authorized to connect, it is strongly recommended
492 * to provide a non-%NULL #GDBusAuthObserver.
493 *
494 * Connect to the #GDBusServer::new-connection signal to handle
495 * incoming connections.
496 *
497 * The returned #GDBusServer isn't active - you have to start it with
498 * g_dbus_server_start().
499 *
500 * #GDBusServer is used in this [example][gdbus-peer-to-peer].
501 *
502 * This is a synchronous failable constructor. There is currently no
503 * asynchronous version.
504 *
505 * Returns: A #GDBusServer or %NULL if @error is set. Free with
506 * g_object_unref().
507 *
508 * Since: 2.26
509 */
510 GDBusServer *
g_dbus_server_new_sync(const gchar * address,GDBusServerFlags flags,const gchar * guid,GDBusAuthObserver * observer,GCancellable * cancellable,GError ** error)511 g_dbus_server_new_sync (const gchar *address,
512 GDBusServerFlags flags,
513 const gchar *guid,
514 GDBusAuthObserver *observer,
515 GCancellable *cancellable,
516 GError **error)
517 {
518 GDBusServer *server;
519
520 g_return_val_if_fail (address != NULL, NULL);
521 g_return_val_if_fail (g_dbus_is_guid (guid), NULL);
522 g_return_val_if_fail ((flags & ~G_DBUS_SERVER_FLAGS_ALL) == 0, NULL);
523 g_return_val_if_fail (error == NULL || *error == NULL, NULL);
524
525 server = g_initable_new (G_TYPE_DBUS_SERVER,
526 cancellable,
527 error,
528 "address", address,
529 "flags", flags,
530 "guid", guid,
531 "authentication-observer", observer,
532 NULL);
533
534 return server;
535 }
536
537 /**
538 * g_dbus_server_get_client_address:
539 * @server: A #GDBusServer.
540 *
541 * Gets a
542 * [D-Bus address](https://dbus.freedesktop.org/doc/dbus-specification.html#addresses)
543 * string that can be used by clients to connect to @server.
544 *
545 * Returns: A D-Bus address string. Do not free, the string is owned
546 * by @server.
547 *
548 * Since: 2.26
549 */
550 const gchar *
g_dbus_server_get_client_address(GDBusServer * server)551 g_dbus_server_get_client_address (GDBusServer *server)
552 {
553 g_return_val_if_fail (G_IS_DBUS_SERVER (server), NULL);
554 return server->client_address;
555 }
556
557 /**
558 * g_dbus_server_get_guid:
559 * @server: A #GDBusServer.
560 *
561 * Gets the GUID for @server.
562 *
563 * Returns: A D-Bus GUID. Do not free this string, it is owned by @server.
564 *
565 * Since: 2.26
566 */
567 const gchar *
g_dbus_server_get_guid(GDBusServer * server)568 g_dbus_server_get_guid (GDBusServer *server)
569 {
570 g_return_val_if_fail (G_IS_DBUS_SERVER (server), NULL);
571 return server->guid;
572 }
573
574 /**
575 * g_dbus_server_get_flags:
576 * @server: A #GDBusServer.
577 *
578 * Gets the flags for @server.
579 *
580 * Returns: A set of flags from the #GDBusServerFlags enumeration.
581 *
582 * Since: 2.26
583 */
584 GDBusServerFlags
g_dbus_server_get_flags(GDBusServer * server)585 g_dbus_server_get_flags (GDBusServer *server)
586 {
587 g_return_val_if_fail (G_IS_DBUS_SERVER (server), G_DBUS_SERVER_FLAGS_NONE);
588 return server->flags;
589 }
590
591 /**
592 * g_dbus_server_is_active:
593 * @server: A #GDBusServer.
594 *
595 * Gets whether @server is active.
596 *
597 * Returns: %TRUE if server is active, %FALSE otherwise.
598 *
599 * Since: 2.26
600 */
601 gboolean
g_dbus_server_is_active(GDBusServer * server)602 g_dbus_server_is_active (GDBusServer *server)
603 {
604 g_return_val_if_fail (G_IS_DBUS_SERVER (server), G_DBUS_SERVER_FLAGS_NONE);
605 return server->active;
606 }
607
608 /**
609 * g_dbus_server_start:
610 * @server: A #GDBusServer.
611 *
612 * Starts @server.
613 *
614 * Since: 2.26
615 */
616 void
g_dbus_server_start(GDBusServer * server)617 g_dbus_server_start (GDBusServer *server)
618 {
619 g_return_if_fail (G_IS_DBUS_SERVER (server));
620 if (server->active)
621 return;
622 /* Right now we don't have any transport not using the listener... */
623 g_assert (server->is_using_listener);
624 server->run_signal_handler_id = g_signal_connect_data (G_SOCKET_SERVICE (server->listener),
625 "run",
626 G_CALLBACK (on_run),
627 g_object_ref (server),
628 (GClosureNotify) g_object_unref,
629 0 /* flags */);
630 g_socket_service_start (G_SOCKET_SERVICE (server->listener));
631 server->active = TRUE;
632 g_object_notify (G_OBJECT (server), "active");
633 }
634
635 /**
636 * g_dbus_server_stop:
637 * @server: A #GDBusServer.
638 *
639 * Stops @server.
640 *
641 * Since: 2.26
642 */
643 void
g_dbus_server_stop(GDBusServer * server)644 g_dbus_server_stop (GDBusServer *server)
645 {
646 g_return_if_fail (G_IS_DBUS_SERVER (server));
647 if (!server->active)
648 return;
649 /* Right now we don't have any transport not using the listener... */
650 g_assert (server->is_using_listener);
651 g_assert (server->run_signal_handler_id > 0);
652 g_clear_signal_handler (&server->run_signal_handler_id, server->listener);
653 g_socket_service_stop (G_SOCKET_SERVICE (server->listener));
654 server->active = FALSE;
655 g_object_notify (G_OBJECT (server), "active");
656
657 if (server->unix_socket_path)
658 {
659 if (g_unlink (server->unix_socket_path) != 0)
660 g_warning ("Failed to delete %s: %s", server->unix_socket_path, g_strerror (errno));
661 }
662
663 if (server->nonce_file)
664 {
665 if (g_unlink (server->nonce_file) != 0)
666 g_warning ("Failed to delete %s: %s", server->nonce_file, g_strerror (errno));
667 }
668 }
669
670 /* ---------------------------------------------------------------------------------------------------- */
671
672 #ifdef G_OS_UNIX
673
674 static gint
random_ascii(void)675 random_ascii (void)
676 {
677 gint ret;
678 ret = g_random_int_range (0, 60);
679 if (ret < 25)
680 ret += 'A';
681 else if (ret < 50)
682 ret += 'a' - 25;
683 else
684 ret += '0' - 50;
685 return ret;
686 }
687
688 /* note that address_entry has already been validated => exactly one of path, dir, tmpdir, or abstract keys are set */
689 static gboolean
try_unix(GDBusServer * server,const gchar * address_entry,GHashTable * key_value_pairs,GError ** error)690 try_unix (GDBusServer *server,
691 const gchar *address_entry,
692 GHashTable *key_value_pairs,
693 GError **error)
694 {
695 gboolean ret;
696 const gchar *path;
697 const gchar *dir;
698 const gchar *tmpdir;
699 const gchar *abstract;
700 GSocketAddress *address;
701
702 ret = FALSE;
703 address = NULL;
704
705 path = g_hash_table_lookup (key_value_pairs, "path");
706 dir = g_hash_table_lookup (key_value_pairs, "dir");
707 tmpdir = g_hash_table_lookup (key_value_pairs, "tmpdir");
708 abstract = g_hash_table_lookup (key_value_pairs, "abstract");
709
710 if (path != NULL)
711 {
712 address = g_unix_socket_address_new (path);
713 }
714 else if (dir != NULL || tmpdir != NULL)
715 {
716 gint n;
717 GString *s;
718 GError *local_error;
719
720 retry:
721 s = g_string_new (tmpdir != NULL ? tmpdir : dir);
722 g_string_append (s, "/dbus-");
723 for (n = 0; n < 8; n++)
724 g_string_append_c (s, random_ascii ());
725
726 /* prefer abstract namespace if available for tmpdir: addresses
727 * abstract namespace is disallowed for dir: addresses */
728 if (tmpdir != NULL && g_unix_socket_address_abstract_names_supported ())
729 address = g_unix_socket_address_new_with_type (s->str,
730 -1,
731 G_UNIX_SOCKET_ADDRESS_ABSTRACT);
732 else
733 address = g_unix_socket_address_new (s->str);
734 g_string_free (s, TRUE);
735
736 local_error = NULL;
737 if (!g_socket_listener_add_address (server->listener,
738 address,
739 G_SOCKET_TYPE_STREAM,
740 G_SOCKET_PROTOCOL_DEFAULT,
741 NULL, /* source_object */
742 NULL, /* effective_address */
743 &local_error))
744 {
745 if (local_error->domain == G_IO_ERROR && local_error->code == G_IO_ERROR_ADDRESS_IN_USE)
746 {
747 g_error_free (local_error);
748 goto retry;
749 }
750 g_propagate_error (error, local_error);
751 goto out;
752 }
753 ret = TRUE;
754 goto out;
755 }
756 else if (abstract != NULL)
757 {
758 if (!g_unix_socket_address_abstract_names_supported ())
759 {
760 g_set_error_literal (error,
761 G_IO_ERROR,
762 G_IO_ERROR_NOT_SUPPORTED,
763 _("Abstract namespace not supported"));
764 goto out;
765 }
766 address = g_unix_socket_address_new_with_type (abstract,
767 -1,
768 G_UNIX_SOCKET_ADDRESS_ABSTRACT);
769 }
770 else
771 {
772 g_assert_not_reached ();
773 }
774
775 if (!g_socket_listener_add_address (server->listener,
776 address,
777 G_SOCKET_TYPE_STREAM,
778 G_SOCKET_PROTOCOL_DEFAULT,
779 NULL, /* source_object */
780 NULL, /* effective_address */
781 error))
782 goto out;
783
784 ret = TRUE;
785
786 out:
787
788 if (address != NULL)
789 {
790 /* Fill out client_address if the connection attempt worked */
791 if (ret)
792 {
793 const char *address_path;
794 char *escaped_path;
795
796 server->is_using_listener = TRUE;
797 address_path = g_unix_socket_address_get_path (G_UNIX_SOCKET_ADDRESS (address));
798 escaped_path = g_dbus_address_escape_value (address_path);
799
800 switch (g_unix_socket_address_get_address_type (G_UNIX_SOCKET_ADDRESS (address)))
801 {
802 case G_UNIX_SOCKET_ADDRESS_ABSTRACT:
803 server->client_address = g_strdup_printf ("unix:abstract=%s", escaped_path);
804 break;
805
806 case G_UNIX_SOCKET_ADDRESS_PATH:
807 server->client_address = g_strdup_printf ("unix:path=%s", escaped_path);
808 server->unix_socket_path = g_strdup (address_path);
809 break;
810
811 default:
812 g_assert_not_reached ();
813 break;
814 }
815
816 g_free (escaped_path);
817 }
818 g_object_unref (address);
819 }
820 return ret;
821 }
822 #endif
823
824 /* ---------------------------------------------------------------------------------------------------- */
825
826 /* note that address_entry has already been validated =>
827 * both host and port (guaranteed to be a number in [0, 65535]) are set (family is optional)
828 */
829 static gboolean
try_tcp(GDBusServer * server,const gchar * address_entry,GHashTable * key_value_pairs,gboolean do_nonce,GError ** error)830 try_tcp (GDBusServer *server,
831 const gchar *address_entry,
832 GHashTable *key_value_pairs,
833 gboolean do_nonce,
834 GError **error)
835 {
836 gboolean ret;
837 const gchar *host;
838 const gchar *port;
839 gint port_num;
840 GResolver *resolver;
841 GList *resolved_addresses;
842 GList *l;
843
844 ret = FALSE;
845 resolver = NULL;
846 resolved_addresses = NULL;
847
848 host = g_hash_table_lookup (key_value_pairs, "host");
849 port = g_hash_table_lookup (key_value_pairs, "port");
850 /* family = g_hash_table_lookup (key_value_pairs, "family"); */
851 if (g_hash_table_lookup (key_value_pairs, "noncefile") != NULL)
852 {
853 g_set_error_literal (error,
854 G_IO_ERROR,
855 G_IO_ERROR_INVALID_ARGUMENT,
856 _("Cannot specify nonce file when creating a server"));
857 goto out;
858 }
859
860 if (host == NULL)
861 host = "localhost";
862 if (port == NULL)
863 port = "0";
864 port_num = strtol (port, NULL, 10);
865
866 resolver = g_resolver_get_default ();
867 resolved_addresses = g_resolver_lookup_by_name (resolver,
868 host,
869 NULL,
870 error);
871 if (resolved_addresses == NULL)
872 goto out;
873
874 /* TODO: handle family */
875 for (l = resolved_addresses; l != NULL; l = l->next)
876 {
877 GInetAddress *address = G_INET_ADDRESS (l->data);
878 GSocketAddress *socket_address;
879 GSocketAddress *effective_address;
880
881 socket_address = g_inet_socket_address_new (address, port_num);
882 if (!g_socket_listener_add_address (server->listener,
883 socket_address,
884 G_SOCKET_TYPE_STREAM,
885 G_SOCKET_PROTOCOL_TCP,
886 NULL, /* GObject *source_object */
887 &effective_address,
888 error))
889 {
890 g_object_unref (socket_address);
891 goto out;
892 }
893 if (port_num == 0)
894 /* make sure we allocate the same port number for other listeners */
895 port_num = g_inet_socket_address_get_port (G_INET_SOCKET_ADDRESS (effective_address));
896
897 g_object_unref (effective_address);
898 g_object_unref (socket_address);
899 }
900
901 if (do_nonce)
902 {
903 gint fd;
904 guint n;
905 gsize bytes_written;
906 gsize bytes_remaining;
907 char *file_escaped;
908 char *host_escaped;
909
910 server->nonce = g_new0 (guchar, 16);
911 for (n = 0; n < 16; n++)
912 server->nonce[n] = g_random_int_range (0, 256);
913 fd = g_file_open_tmp ("gdbus-nonce-file-XXXXXX",
914 &server->nonce_file,
915 error);
916 if (fd == -1)
917 {
918 g_socket_listener_close (server->listener);
919 goto out;
920 }
921 again:
922 bytes_written = 0;
923 bytes_remaining = 16;
924 while (bytes_remaining > 0)
925 {
926 gssize ret;
927 int errsv;
928
929 ret = write (fd, server->nonce + bytes_written, bytes_remaining);
930 errsv = errno;
931 if (ret == -1)
932 {
933 if (errsv == EINTR)
934 goto again;
935 g_set_error (error,
936 G_IO_ERROR,
937 g_io_error_from_errno (errsv),
938 _("Error writing nonce file at “%s”: %s"),
939 server->nonce_file,
940 g_strerror (errsv));
941 goto out;
942 }
943 bytes_written += ret;
944 bytes_remaining -= ret;
945 }
946 if (!g_close (fd, error))
947 goto out;
948 host_escaped = g_dbus_address_escape_value (host);
949 file_escaped = g_dbus_address_escape_value (server->nonce_file);
950 server->client_address = g_strdup_printf ("nonce-tcp:host=%s,port=%d,noncefile=%s",
951 host_escaped,
952 port_num,
953 file_escaped);
954 g_free (host_escaped);
955 g_free (file_escaped);
956 }
957 else
958 {
959 server->client_address = g_strdup_printf ("tcp:host=%s,port=%d", host, port_num);
960 }
961 server->is_using_listener = TRUE;
962 ret = TRUE;
963
964 out:
965 g_list_free_full (resolved_addresses, g_object_unref);
966 if (resolver)
967 g_object_unref (resolver);
968 return ret;
969 }
970
971 /* ---------------------------------------------------------------------------------------------------- */
972
973 typedef struct
974 {
975 GDBusServer *server;
976 GDBusConnection *connection;
977 } EmitIdleData;
978
979 static void
emit_idle_data_free(EmitIdleData * data)980 emit_idle_data_free (EmitIdleData *data)
981 {
982 g_object_unref (data->server);
983 g_object_unref (data->connection);
984 g_free (data);
985 }
986
987 static gboolean
emit_new_connection_in_idle(gpointer user_data)988 emit_new_connection_in_idle (gpointer user_data)
989 {
990 EmitIdleData *data = user_data;
991 gboolean claimed;
992
993 claimed = FALSE;
994 g_signal_emit (data->server,
995 _signals[NEW_CONNECTION_SIGNAL],
996 0,
997 data->connection,
998 &claimed);
999
1000 if (claimed)
1001 g_dbus_connection_start_message_processing (data->connection);
1002 g_object_unref (data->connection);
1003
1004 return FALSE;
1005 }
1006
1007 /* Called in new thread */
1008 static gboolean
on_run(GSocketService * service,GSocketConnection * socket_connection,GObject * source_object,gpointer user_data)1009 on_run (GSocketService *service,
1010 GSocketConnection *socket_connection,
1011 GObject *source_object,
1012 gpointer user_data)
1013 {
1014 GDBusServer *server = G_DBUS_SERVER (user_data);
1015 GDBusConnection *connection;
1016 GDBusConnectionFlags connection_flags;
1017
1018 if (server->nonce != NULL)
1019 {
1020 gchar buf[16];
1021 gsize bytes_read;
1022
1023 if (!g_input_stream_read_all (g_io_stream_get_input_stream (G_IO_STREAM (socket_connection)),
1024 buf,
1025 16,
1026 &bytes_read,
1027 NULL, /* GCancellable */
1028 NULL)) /* GError */
1029 goto out;
1030
1031 if (bytes_read != 16)
1032 goto out;
1033
1034 if (memcmp (buf, server->nonce, 16) != 0)
1035 goto out;
1036 }
1037
1038 connection_flags =
1039 G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_SERVER |
1040 G_DBUS_CONNECTION_FLAGS_DELAY_MESSAGE_PROCESSING;
1041 if (server->flags & G_DBUS_SERVER_FLAGS_AUTHENTICATION_ALLOW_ANONYMOUS)
1042 connection_flags |= G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_ALLOW_ANONYMOUS;
1043 if (server->flags & G_DBUS_SERVER_FLAGS_AUTHENTICATION_REQUIRE_SAME_USER)
1044 connection_flags |= G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_REQUIRE_SAME_USER;
1045
1046 connection = g_dbus_connection_new_sync (G_IO_STREAM (socket_connection),
1047 server->guid,
1048 connection_flags,
1049 server->authentication_observer,
1050 NULL, /* GCancellable */
1051 NULL); /* GError */
1052 if (connection == NULL)
1053 goto out;
1054
1055 if (server->flags & G_DBUS_SERVER_FLAGS_RUN_IN_THREAD)
1056 {
1057 gboolean claimed;
1058
1059 claimed = FALSE;
1060 g_signal_emit (server,
1061 _signals[NEW_CONNECTION_SIGNAL],
1062 0,
1063 connection,
1064 &claimed);
1065 if (claimed)
1066 g_dbus_connection_start_message_processing (connection);
1067 g_object_unref (connection);
1068 }
1069 else
1070 {
1071 GSource *idle_source;
1072 EmitIdleData *data;
1073
1074 data = g_new0 (EmitIdleData, 1);
1075 data->server = g_object_ref (server);
1076 data->connection = g_object_ref (connection);
1077
1078 idle_source = g_idle_source_new ();
1079 g_source_set_priority (idle_source, G_PRIORITY_DEFAULT);
1080 g_source_set_callback (idle_source,
1081 emit_new_connection_in_idle,
1082 data,
1083 (GDestroyNotify) emit_idle_data_free);
1084 g_source_set_name (idle_source, "[gio] emit_new_connection_in_idle");
1085 g_source_attach (idle_source, server->main_context_at_construction);
1086 g_source_unref (idle_source);
1087 }
1088
1089 out:
1090 return TRUE;
1091 }
1092
1093 static gboolean
initable_init(GInitable * initable,GCancellable * cancellable,GError ** error)1094 initable_init (GInitable *initable,
1095 GCancellable *cancellable,
1096 GError **error)
1097 {
1098 GDBusServer *server = G_DBUS_SERVER (initable);
1099 gboolean ret;
1100 guint n;
1101 gchar **addr_array;
1102 GError *last_error;
1103
1104 ret = FALSE;
1105 addr_array = NULL;
1106 last_error = NULL;
1107
1108 if (!g_dbus_is_guid (server->guid))
1109 {
1110 g_set_error (&last_error,
1111 G_IO_ERROR,
1112 G_IO_ERROR_INVALID_ARGUMENT,
1113 _("The string “%s” is not a valid D-Bus GUID"),
1114 server->guid);
1115 goto out;
1116 }
1117
1118 server->listener = G_SOCKET_LISTENER (g_threaded_socket_service_new (-1));
1119
1120 addr_array = g_strsplit (server->address, ";", 0);
1121 last_error = NULL;
1122 for (n = 0; addr_array != NULL && addr_array[n] != NULL; n++)
1123 {
1124 const gchar *address_entry = addr_array[n];
1125 GHashTable *key_value_pairs;
1126 gchar *transport_name;
1127 GError *this_error;
1128
1129 this_error = NULL;
1130 if (g_dbus_is_supported_address (address_entry,
1131 &this_error) &&
1132 _g_dbus_address_parse_entry (address_entry,
1133 &transport_name,
1134 &key_value_pairs,
1135 &this_error))
1136 {
1137
1138 if (FALSE)
1139 {
1140 }
1141 #ifdef G_OS_UNIX
1142 else if (g_strcmp0 (transport_name, "unix") == 0)
1143 ret = try_unix (server, address_entry, key_value_pairs, &this_error);
1144 #endif
1145 else if (g_strcmp0 (transport_name, "tcp") == 0)
1146 ret = try_tcp (server, address_entry, key_value_pairs, FALSE, &this_error);
1147 else if (g_strcmp0 (transport_name, "nonce-tcp") == 0)
1148 ret = try_tcp (server, address_entry, key_value_pairs, TRUE, &this_error);
1149 else
1150 g_set_error (&this_error,
1151 G_IO_ERROR,
1152 G_IO_ERROR_INVALID_ARGUMENT,
1153 _("Cannot listen on unsupported transport “%s”"),
1154 transport_name);
1155
1156 g_free (transport_name);
1157 if (key_value_pairs != NULL)
1158 g_hash_table_unref (key_value_pairs);
1159
1160 if (ret)
1161 {
1162 g_assert (this_error == NULL);
1163 goto out;
1164 }
1165 }
1166
1167 if (this_error != NULL)
1168 {
1169 if (last_error != NULL)
1170 g_error_free (last_error);
1171 last_error = this_error;
1172 }
1173 }
1174
1175 out:
1176
1177 g_strfreev (addr_array);
1178
1179 if (ret)
1180 {
1181 g_clear_error (&last_error);
1182 }
1183 else
1184 {
1185 g_assert (last_error != NULL);
1186 g_propagate_error (error, last_error);
1187 }
1188 return ret;
1189 }
1190
1191
1192 static void
initable_iface_init(GInitableIface * initable_iface)1193 initable_iface_init (GInitableIface *initable_iface)
1194 {
1195 initable_iface->init = initable_init;
1196 }
1197
1198 /* ---------------------------------------------------------------------------------------------------- */
1199