1 /* -*- mode: C; c-file-style: "gnu" -*- */
2 /* dbus-server.c DBusServer object
4 * Copyright (C) 2002, 2003, 2004 Red Hat Inc.
6 * Licensed under the Academic Free License version 2.1
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.
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.
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 #include "dbus-server.h"
25 #include "dbus-server-unix.h"
26 #include "dbus-string.h"
27 #ifdef DBUS_BUILD_TESTS
28 #include "dbus-server-debug-pipe.h"
30 #include "dbus-address.h"
31 #include "dbus-protocol.h"
34 * @defgroup DBusServer DBusServer
36 * @brief Server that listens for new connections.
38 * Types and functions related to DBusServer.
39 * A DBusServer represents a server that other applications
40 * can connect to. Each connection from another application
41 * is represented by a DBusConnection.
43 * @todo Thread safety hasn't been looked at for #DBusServer
44 * @todo Need notification to apps of disconnection, may matter for some transports
48 * @defgroup DBusServerInternals DBusServer implementation details
49 * @ingroup DBusInternals
50 * @brief Implementation details of DBusServer
56 * Initializes the members of the DBusServer base class.
57 * Chained up to by subclass constructors.
59 * @param server the server.
60 * @param vtable the vtable for the subclass.
61 * @param address the server's address
62 * @returns #TRUE on success.
65 _dbus_server_init_base (DBusServer *server,
66 const DBusServerVTable *vtable,
67 const DBusString *address)
69 server->vtable = vtable;
70 server->refcount.value = 1;
72 server->address = NULL;
73 server->watches = NULL;
74 server->timeouts = NULL;
76 if (!_dbus_string_copy_data (address, &server->address))
79 server->mutex = dbus_mutex_new ();
80 if (server->mutex == NULL)
83 server->watches = _dbus_watch_list_new ();
84 if (server->watches == NULL)
87 server->timeouts = _dbus_timeout_list_new ();
88 if (server->timeouts == NULL)
91 _dbus_data_slot_list_init (&server->slot_list);
93 _dbus_verbose ("Initialized server on address %s\n", server->address);
100 dbus_mutex_free (server->mutex);
101 server->mutex = NULL;
105 _dbus_watch_list_free (server->watches);
106 server->watches = NULL;
108 if (server->timeouts)
110 _dbus_timeout_list_free (server->timeouts);
111 server->timeouts = NULL;
115 dbus_free (server->address);
116 server->address = NULL;
123 * Finalizes the members of the DBusServer base class.
124 * Chained up to by subclass finalizers.
126 * @param server the server.
129 _dbus_server_finalize_base (DBusServer *server)
131 /* calls out to application code... */
132 _dbus_data_slot_list_free (&server->slot_list);
134 dbus_server_set_new_connection_function (server, NULL, NULL, NULL);
136 if (!server->disconnected)
137 dbus_server_disconnect (server);
139 _dbus_watch_list_free (server->watches);
140 _dbus_timeout_list_free (server->timeouts);
142 dbus_mutex_free (server->mutex);
144 dbus_free (server->address);
146 dbus_free_string_array (server->auth_mechanisms);
150 * Adds a watch for this server, chaining out to application-provided
153 * @param server the server.
154 * @param watch the watch to add.
157 _dbus_server_add_watch (DBusServer *server,
160 HAVE_LOCK_CHECK (server);
161 return _dbus_watch_list_add_watch (server->watches, watch);
165 * Removes a watch previously added with _dbus_server_remove_watch().
167 * @param server the server.
168 * @param watch the watch to remove.
171 _dbus_server_remove_watch (DBusServer *server,
174 HAVE_LOCK_CHECK (server);
175 _dbus_watch_list_remove_watch (server->watches, watch);
179 * Toggles a watch and notifies app via server's
180 * DBusWatchToggledFunction if available. It's an error to call this
181 * function on a watch that was not previously added.
183 * @param server the server.
184 * @param watch the watch to toggle.
185 * @param enabled whether to enable or disable
188 _dbus_server_toggle_watch (DBusServer *server,
192 HAVE_LOCK_CHECK (server);
194 if (server->watches) /* null during finalize */
195 _dbus_watch_list_toggle_watch (server->watches,
200 * Adds a timeout for this server, chaining out to
201 * application-provided timeout handlers. The timeout should be
202 * repeatedly handled with dbus_timeout_handle() at its given interval
203 * until it is removed.
205 * @param server the server.
206 * @param timeout the timeout to add.
209 _dbus_server_add_timeout (DBusServer *server,
210 DBusTimeout *timeout)
212 HAVE_LOCK_CHECK (server);
214 return _dbus_timeout_list_add_timeout (server->timeouts, timeout);
218 * Removes a timeout previously added with _dbus_server_add_timeout().
220 * @param server the server.
221 * @param timeout the timeout to remove.
224 _dbus_server_remove_timeout (DBusServer *server,
225 DBusTimeout *timeout)
227 HAVE_LOCK_CHECK (server);
229 _dbus_timeout_list_remove_timeout (server->timeouts, timeout);
233 * Toggles a timeout and notifies app via server's
234 * DBusTimeoutToggledFunction if available. It's an error to call this
235 * function on a timeout that was not previously added.
237 * @param server the server.
238 * @param timeout the timeout to toggle.
239 * @param enabled whether to enable or disable
242 _dbus_server_toggle_timeout (DBusServer *server,
243 DBusTimeout *timeout,
246 HAVE_LOCK_CHECK (server);
248 if (server->timeouts) /* null during finalize */
249 _dbus_timeout_list_toggle_timeout (server->timeouts,
257 * @addtogroup DBusServer
264 * @typedef DBusServer
266 * An opaque object representing a server that listens for
267 * connections from other applications. Each time a connection
268 * is made, a new DBusConnection is created and made available
269 * via an application-provided DBusNewConnectionFunction.
270 * The DBusNewConnectionFunction is provided with
271 * dbus_server_set_new_connection_function().
276 * Listens for new connections on the given address.
277 * Returns #NULL if listening fails for any reason.
278 * Otherwise returns a new #DBusServer.
279 * dbus_server_set_new_connection_function() and
280 * dbus_server_set_watch_functions() should be called
281 * immediately to render the server fully functional.
283 * @todo error messages on bad address could really be better.
284 * DBusResultCode is a bit limiting here.
286 * @param address the address of this server.
287 * @param error location to store rationale for failure.
288 * @returns a new DBusServer, or #NULL on failure.
292 dbus_server_listen (const char *address,
296 DBusAddressEntry **entries;
298 const char *address_problem_type;
299 const char *address_problem_field;
300 const char *address_problem_other;
302 _dbus_return_val_if_fail (address != NULL, NULL);
303 _dbus_return_val_if_error_is_set (error, NULL);
305 if (!dbus_parse_address (address, &entries, &len, error))
309 address_problem_type = NULL;
310 address_problem_field = NULL;
311 address_problem_other = NULL;
313 for (i = 0; i < len; i++)
315 const char *method = dbus_address_entry_get_method (entries[i]);
317 if (strcmp (method, "unix") == 0)
319 const char *path = dbus_address_entry_get_value (entries[i], "path");
320 const char *tmpdir = dbus_address_entry_get_value (entries[i], "tmpdir");
321 const char *abstract = dbus_address_entry_get_value (entries[i], "abstract");
323 if (path == NULL && tmpdir == NULL && abstract == NULL)
325 address_problem_type = "unix";
326 address_problem_field = "path or tmpdir or abstract";
330 if ((path && tmpdir) ||
331 (path && abstract) ||
332 (tmpdir && abstract))
334 address_problem_other = "cannot specify two of \"path\" and \"tmpdir\" and \"abstract\" at the same time";
340 DBusString full_path;
343 if (!_dbus_string_init (&full_path))
345 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
349 if (!_dbus_string_init (&filename))
351 _dbus_string_free (&full_path);
352 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
356 if (!_dbus_string_append (&filename,
358 !_dbus_generate_random_ascii (&filename, 10) ||
359 !_dbus_string_append (&full_path, tmpdir) ||
360 !_dbus_concat_dir_and_file (&full_path, &filename))
362 _dbus_string_free (&full_path);
363 _dbus_string_free (&filename);
364 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
368 /* FIXME - we will unconditionally unlink() the path if
369 * we don't support abstract namespace. unlink() does
370 * not follow symlinks, but would like independent
371 * confirmation this is safe enough. See also
372 * _dbus_listen_unix_socket() and comments therein.
375 /* Always use abstract namespace if possible with tmpdir */
378 _dbus_server_new_for_domain_socket (_dbus_string_get_const_data (&full_path),
379 #ifdef HAVE_ABSTRACT_SOCKETS
386 _dbus_string_free (&full_path);
387 _dbus_string_free (&filename);
392 server = _dbus_server_new_for_domain_socket (path, FALSE, error);
394 server = _dbus_server_new_for_domain_socket (abstract, TRUE, error);
397 else if (strcmp (method, "tcp") == 0)
399 const char *host = dbus_address_entry_get_value (entries[i], "host");
400 const char *port = dbus_address_entry_get_value (entries[i], "port");
407 address_problem_type = "tcp";
408 address_problem_field = "port";
412 _dbus_string_init_const (&str, port);
413 sresult = _dbus_string_parse_int (&str, 0, &lport, NULL);
414 _dbus_string_free (&str);
416 if (sresult == FALSE || lport <= 0 || lport > 65535)
418 address_problem_other = "Port is not an integer between 0 and 65535";
422 server = _dbus_server_new_for_tcp_socket (host, lport, error);
427 #ifdef DBUS_BUILD_TESTS
428 else if (strcmp (method, "debug-pipe") == 0)
430 const char *name = dbus_address_entry_get_value (entries[i], "name");
434 address_problem_type = "debug-pipe";
435 address_problem_field = "name";
439 server = _dbus_server_debug_pipe_new (name, error);
444 address_problem_other = "Unknown address type (examples of valid types are \"unix\" and \"tcp\")";
454 dbus_address_entries_free (entries);
458 dbus_address_entries_free (entries);
459 if (address_problem_type != NULL)
460 dbus_set_error (error, DBUS_ERROR_BAD_ADDRESS,
461 "Server address of type %s was missing argument %s",
462 address_problem_type, address_problem_field);
464 dbus_set_error (error, DBUS_ERROR_BAD_ADDRESS,
465 "Could not parse server address: %s",
466 address_problem_other);
472 * Increments the reference count of a DBusServer.
474 * @param server the server.
475 * @returns the server
478 dbus_server_ref (DBusServer *server)
480 _dbus_return_val_if_fail (server != NULL, NULL);
482 #ifdef DBUS_HAVE_ATOMIC_INT
483 _dbus_atomic_inc (&server->refcount);
485 SERVER_LOCK (server);
486 _dbus_assert (server->refcount.value > 0);
488 server->refcount.value += 1;
489 SERVER_UNLOCK (server);
496 * Decrements the reference count of a DBusServer. Finalizes the
497 * server if the reference count reaches zero. The server connection
498 * will be closed as with dbus_server_disconnect() when the server is
501 * @param server the server.
504 dbus_server_unref (DBusServer *server)
506 dbus_bool_t last_unref;
508 _dbus_return_if_fail (server != NULL);
510 #ifdef DBUS_HAVE_ATOMIC_INT
511 last_unref = (_dbus_atomic_dec (&server->refcount) == 1);
513 SERVER_LOCK (server);
515 _dbus_assert (server->refcount.value > 0);
517 server->refcount.value -= 1;
518 last_unref = (server->refcount.value == 0);
520 SERVER_UNLOCK (server);
525 _dbus_assert (server->vtable->finalize != NULL);
527 (* server->vtable->finalize) (server);
532 * Like dbus_server_ref() but does not acquire the lock (must already be held)
534 * @param server the server.
537 _dbus_server_ref_unlocked (DBusServer *server)
539 HAVE_LOCK_CHECK (server);
541 #ifdef DBUS_HAVE_ATOMIC_INT
542 _dbus_atomic_inc (&server->refcount);
544 _dbus_assert (server->refcount.value > 0);
546 server->refcount.value += 1;
551 * Releases the server's address and stops listening for
552 * new clients. If called more than once, only the first
553 * call has an effect. Does not modify the server's
556 * @param server the server.
559 dbus_server_disconnect (DBusServer *server)
561 _dbus_return_if_fail (server != NULL);
563 SERVER_LOCK (server);
565 _dbus_assert (server->vtable->disconnect != NULL);
567 if (server->disconnected)
570 (* server->vtable->disconnect) (server);
571 server->disconnected = TRUE;
573 SERVER_UNLOCK (server);
577 * Returns #TRUE if the server is still listening for new connections.
579 * @param server the server.
582 dbus_server_get_is_connected (DBusServer *server)
586 _dbus_return_val_if_fail (server != NULL, FALSE);
588 SERVER_LOCK (server);
589 retval = !server->disconnected;
590 SERVER_UNLOCK (server);
596 * Returns the address of the server, as a newly-allocated
597 * string which must be freed by the caller.
599 * @param server the server
600 * @returns the address or #NULL if no memory
603 dbus_server_get_address (DBusServer *server)
607 _dbus_return_val_if_fail (server != NULL, NULL);
609 SERVER_LOCK (server);
610 retval = _dbus_strdup (server->address);
611 SERVER_UNLOCK (server);
617 * Sets a function to be used for handling new connections. The given
618 * function is passed each new connection as the connection is
619 * created. If the new connection function increments the connection's
620 * reference count, the connection will stay alive. Otherwise, the
621 * connection will be unreferenced and closed.
623 * @param server the server.
624 * @param function a function to handle new connections.
625 * @param data data to pass to the new connection handler.
626 * @param free_data_function function to free the data.
629 dbus_server_set_new_connection_function (DBusServer *server,
630 DBusNewConnectionFunction function,
632 DBusFreeFunction free_data_function)
634 DBusFreeFunction old_free_function;
637 _dbus_return_if_fail (server != NULL);
639 SERVER_LOCK (server);
640 old_free_function = server->new_connection_free_data_function;
641 old_data = server->new_connection_data;
643 server->new_connection_function = function;
644 server->new_connection_data = data;
645 server->new_connection_free_data_function = free_data_function;
646 SERVER_UNLOCK (server);
648 if (old_free_function != NULL)
649 (* old_free_function) (old_data);
653 * Sets the watch functions for the connection. These functions are
654 * responsible for making the application's main loop aware of file
655 * descriptors that need to be monitored for events.
657 * This function behaves exactly like dbus_connection_set_watch_functions();
658 * see the documentation for that routine.
660 * @param server the server.
661 * @param add_function function to begin monitoring a new descriptor.
662 * @param remove_function function to stop monitoring a descriptor.
663 * @param toggled_function function to notify when the watch is enabled/disabled
664 * @param data data to pass to add_function and remove_function.
665 * @param free_data_function function to be called to free the data.
666 * @returns #FALSE on failure (no memory)
669 dbus_server_set_watch_functions (DBusServer *server,
670 DBusAddWatchFunction add_function,
671 DBusRemoveWatchFunction remove_function,
672 DBusWatchToggledFunction toggled_function,
674 DBusFreeFunction free_data_function)
677 DBusWatchList *watches;
679 _dbus_return_val_if_fail (server != NULL, FALSE);
681 SERVER_LOCK (server);
682 watches = server->watches;
683 server->watches = NULL;
686 SERVER_UNLOCK (server);
687 result = _dbus_watch_list_set_functions (watches,
693 SERVER_LOCK (server);
697 _dbus_warn ("Re-entrant call to %s\n", _DBUS_FUNCTION_NAME);
700 server->watches = watches;
701 SERVER_UNLOCK (server);
707 * Sets the timeout functions for the connection. These functions are
708 * responsible for making the application's main loop aware of timeouts.
710 * This function behaves exactly like dbus_connection_set_timeout_functions();
711 * see the documentation for that routine.
713 * @param server the server.
714 * @param add_function function to add a timeout.
715 * @param remove_function function to remove a timeout.
716 * @param toggled_function function to notify when the timeout is enabled/disabled
717 * @param data data to pass to add_function and remove_function.
718 * @param free_data_function function to be called to free the data.
719 * @returns #FALSE on failure (no memory)
722 dbus_server_set_timeout_functions (DBusServer *server,
723 DBusAddTimeoutFunction add_function,
724 DBusRemoveTimeoutFunction remove_function,
725 DBusTimeoutToggledFunction toggled_function,
727 DBusFreeFunction free_data_function)
730 DBusTimeoutList *timeouts;
732 _dbus_return_val_if_fail (server != NULL, FALSE);
734 SERVER_LOCK (server);
735 timeouts = server->timeouts;
736 server->timeouts = NULL;
739 SERVER_UNLOCK (server);
740 result = _dbus_timeout_list_set_functions (timeouts,
746 SERVER_LOCK (server);
750 _dbus_warn ("Re-entrant call to %s\n", _DBUS_FUNCTION_NAME);
753 server->timeouts = timeouts;
754 SERVER_UNLOCK (server);
760 * Sets the authentication mechanisms that this server offers
761 * to clients, as a list of SASL mechanisms. This function
762 * only affects connections created *after* it is called.
763 * Pass #NULL instead of an array to use all available mechanisms.
765 * @param server the server
766 * @param mechanisms #NULL-terminated array of mechanisms
767 * @returns #FALSE if no memory
770 dbus_server_set_auth_mechanisms (DBusServer *server,
771 const char **mechanisms)
775 _dbus_return_val_if_fail (server != NULL, FALSE);
777 SERVER_LOCK (server);
779 if (mechanisms != NULL)
781 copy = _dbus_dup_string_array (mechanisms);
788 dbus_free_string_array (server->auth_mechanisms);
789 server->auth_mechanisms = copy;
791 SERVER_UNLOCK (server);
797 static DBusDataSlotAllocator slot_allocator;
798 _DBUS_DEFINE_GLOBAL_LOCK (server_slots);
801 * Allocates an integer ID to be used for storing application-specific
802 * data on any DBusServer. The allocated ID may then be used
803 * with dbus_server_set_data() and dbus_server_get_data().
804 * The slot must be initialized with -1. If a nonnegative
805 * slot is passed in, the refcount is incremented on that
806 * slot, rather than creating a new slot.
808 * The allocated slot is global, i.e. all DBusServer objects will have
809 * a slot with the given integer ID reserved.
811 * @param slot_p address of global variable storing the slot ID
812 * @returns #FALSE on no memory
815 dbus_server_allocate_data_slot (dbus_int32_t *slot_p)
817 return _dbus_data_slot_allocator_alloc (&slot_allocator,
818 _DBUS_LOCK_NAME (server_slots),
823 * Deallocates a global ID for server data slots.
824 * dbus_server_get_data() and dbus_server_set_data()
825 * may no longer be used with this slot.
826 * Existing data stored on existing DBusServer objects
827 * will be freed when the server is finalized,
828 * but may not be retrieved (and may only be replaced
829 * if someone else reallocates the slot).
831 * @param slot_p address of the slot to deallocate
834 dbus_server_free_data_slot (dbus_int32_t *slot_p)
836 _dbus_return_if_fail (*slot_p >= 0);
838 _dbus_data_slot_allocator_free (&slot_allocator, slot_p);
842 * Stores a pointer on a DBusServer, along
843 * with an optional function to be used for freeing
844 * the data when the data is set again, or when
845 * the server is finalized. The slot number
846 * must have been allocated with dbus_server_allocate_data_slot().
848 * @param server the server
849 * @param slot the slot number
850 * @param data the data to store
851 * @param free_data_func finalizer function for the data
852 * @returns #TRUE if there was enough memory to store the data
855 dbus_server_set_data (DBusServer *server,
858 DBusFreeFunction free_data_func)
860 DBusFreeFunction old_free_func;
864 _dbus_return_val_if_fail (server != NULL, FALSE);
866 SERVER_LOCK (server);
868 retval = _dbus_data_slot_list_set (&slot_allocator,
870 slot, data, free_data_func,
871 &old_free_func, &old_data);
874 SERVER_UNLOCK (server);
878 /* Do the actual free outside the server lock */
880 (* old_free_func) (old_data);
887 * Retrieves data previously set with dbus_server_set_data().
888 * The slot must still be allocated (must not have been freed).
890 * @param server the server
891 * @param slot the slot to get data from
892 * @returns the data, or #NULL if not found
895 dbus_server_get_data (DBusServer *server,
900 _dbus_return_val_if_fail (server != NULL, NULL);
902 SERVER_LOCK (server);
904 res = _dbus_data_slot_list_get (&slot_allocator,
908 SERVER_UNLOCK (server);
915 #ifdef DBUS_BUILD_TESTS
916 #include "dbus-test.h"
919 _dbus_server_test (void)
921 const char *valid_addresses[] = {
923 "unix:path=./boogie",
924 "tcp:host=localhost,port=1234",
925 "tcp:host=localhost,port=1234;tcp:port=5678",
926 "tcp:port=1234;unix:path=./boogie",
932 for (i = 0; i < _DBUS_N_ELEMENTS (valid_addresses); i++)
934 server = dbus_server_listen (valid_addresses[i], NULL);
936 _dbus_assert_not_reached ("Failed to listen for valid address.");
938 dbus_server_unref (server);
940 /* Try disconnecting before unreffing */
941 server = dbus_server_listen (valid_addresses[i], NULL);
943 _dbus_assert_not_reached ("Failed to listen for valid address.");
945 dbus_server_disconnect (server);
947 dbus_server_unref (server);
953 #endif /* DBUS_BUILD_TESTS */