1 /* -*- mode: C; c-file-style: "gnu" -*- */
2 /* dbus-transport.c DBusTransport object (internal to D-Bus implementation)
4 * Copyright (C) 2002, 2003 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-transport-protected.h"
25 #include "dbus-transport-unix.h"
26 #include "dbus-transport-socket.h"
27 #include "dbus-connection-internal.h"
28 #include "dbus-watch.h"
29 #include "dbus-auth.h"
30 #include "dbus-address.h"
31 #include "dbus-credentials.h"
32 #ifdef DBUS_BUILD_TESTS
33 #include "dbus-server-debug-pipe.h"
37 * @defgroup DBusTransport DBusTransport object
38 * @ingroup DBusInternals
39 * @brief "Backend" for a DBusConnection.
41 * Types and functions related to DBusTransport. A transport is an
42 * abstraction that can send and receive data via various kinds of
43 * network connections or other IPC mechanisms.
49 * @typedef DBusTransport
51 * Opaque object representing a way message stream.
52 * DBusTransport abstracts various kinds of actual
53 * transport mechanism, such as different network protocols,
54 * or encryption schemes.
58 live_messages_size_notify (DBusCounter *counter,
61 DBusTransport *transport = user_data;
63 _dbus_transport_ref (transport);
66 _dbus_verbose ("Counter value is now %d\n",
67 (int) _dbus_counter_get_value (counter));
70 /* disable or re-enable the read watch for the transport if
73 if (transport->vtable->live_messages_changed)
74 (* transport->vtable->live_messages_changed) (transport);
76 _dbus_transport_unref (transport);
80 * Initializes the base class members of DBusTransport. Chained up to
81 * by subclasses in their constructor. The server GUID is the
82 * globally unique ID for the server creating this connection
83 * and will be #NULL for the client side of a connection. The GUID
86 * @param transport the transport being created.
87 * @param vtable the subclass vtable.
88 * @param server_guid non-#NULL if this transport is on the server side of a connection
89 * @param address the address of the transport
90 * @returns #TRUE on success.
93 _dbus_transport_init_base (DBusTransport *transport,
94 const DBusTransportVTable *vtable,
95 const DBusString *server_guid,
96 const DBusString *address)
98 DBusMessageLoader *loader;
100 DBusCounter *counter;
102 DBusCredentials *creds;
104 loader = _dbus_message_loader_new ();
109 auth = _dbus_auth_server_new (server_guid);
111 auth = _dbus_auth_client_new ();
114 _dbus_message_loader_unref (loader);
118 counter = _dbus_counter_new ();
121 _dbus_auth_unref (auth);
122 _dbus_message_loader_unref (loader);
126 creds = _dbus_credentials_new ();
129 _dbus_counter_unref (counter);
130 _dbus_auth_unref (auth);
131 _dbus_message_loader_unref (loader);
137 _dbus_assert (address == NULL);
142 _dbus_assert (address != NULL);
144 if (!_dbus_string_copy_data (address, &address_copy))
146 _dbus_credentials_unref (creds);
147 _dbus_counter_unref (counter);
148 _dbus_auth_unref (auth);
149 _dbus_message_loader_unref (loader);
154 transport->refcount = 1;
155 transport->vtable = vtable;
156 transport->loader = loader;
157 transport->auth = auth;
158 transport->live_messages_size = counter;
159 transport->authenticated = FALSE;
160 transport->disconnected = FALSE;
161 transport->is_server = (server_guid != NULL);
162 transport->send_credentials_pending = !transport->is_server;
163 transport->receive_credentials_pending = transport->is_server;
164 transport->address = address_copy;
166 transport->unix_user_function = NULL;
167 transport->unix_user_data = NULL;
168 transport->free_unix_user_data = NULL;
170 transport->windows_user_function = NULL;
171 transport->windows_user_data = NULL;
172 transport->free_windows_user_data = NULL;
174 transport->expected_guid = NULL;
176 /* Try to default to something that won't totally hose the system,
177 * but doesn't impose too much of a limitation.
179 transport->max_live_messages_size = _DBUS_ONE_MEGABYTE * 63;
181 /* credentials read from socket if any */
182 transport->credentials = creds;
184 _dbus_counter_set_notify (transport->live_messages_size,
185 transport->max_live_messages_size,
186 live_messages_size_notify,
189 if (transport->address)
190 _dbus_verbose ("Initialized transport on address %s\n", transport->address);
196 * Finalizes base class members of DBusTransport.
197 * Chained up to from subclass finalizers.
199 * @param transport the transport.
202 _dbus_transport_finalize_base (DBusTransport *transport)
204 if (!transport->disconnected)
205 _dbus_transport_disconnect (transport);
207 if (transport->free_unix_user_data != NULL)
208 (* transport->free_unix_user_data) (transport->unix_user_data);
210 if (transport->free_windows_user_data != NULL)
211 (* transport->free_windows_user_data) (transport->windows_user_data);
213 _dbus_message_loader_unref (transport->loader);
214 _dbus_auth_unref (transport->auth);
215 _dbus_counter_set_notify (transport->live_messages_size,
217 _dbus_counter_unref (transport->live_messages_size);
218 dbus_free (transport->address);
219 dbus_free (transport->expected_guid);
220 if (transport->credentials)
221 _dbus_credentials_unref (transport->credentials);
226 * Verifies if a given D-Bus address is a valid address
227 * by attempting to connect to it. If it is, returns the
228 * opened DBusTransport object. If it isn't, returns #NULL
231 * @param error address where an error can be returned.
232 * @returns a new transport, or #NULL on failure.
234 static DBusTransport*
235 check_address (const char *address, DBusError *error)
237 DBusAddressEntry **entries;
238 DBusTransport *transport = NULL;
241 _dbus_assert (address != NULL);
242 _dbus_assert (*address != '\0');
244 if (!dbus_parse_address (address, &entries, &len, error))
245 return FALSE; /* not a valid address */
247 for (i = 0; i < len; i++)
249 transport = _dbus_transport_open (entries[i], error);
250 if (transport != NULL)
254 dbus_address_entries_free (entries);
259 * Creates a new transport for the "autostart" method.
260 * This creates a client-side of a transport.
262 * @param error address where an error can be returned.
263 * @returns a new transport, or #NULL on failure.
265 static DBusTransport*
266 _dbus_transport_new_for_autolaunch (DBusError *error)
269 DBusTransport *result = NULL;
271 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
273 if (!_dbus_string_init (&address))
275 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
279 if (!_dbus_get_autolaunch_address (&address, error))
281 _DBUS_ASSERT_ERROR_IS_SET (error);
285 result = check_address (_dbus_string_get_const_data (&address), error);
287 _DBUS_ASSERT_ERROR_IS_SET (error);
289 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
292 _dbus_string_free (&address);
296 static DBusTransportOpenResult
297 _dbus_transport_open_autolaunch (DBusAddressEntry *entry,
298 DBusTransport **transport_p,
303 method = dbus_address_entry_get_method (entry);
304 _dbus_assert (method != NULL);
306 if (strcmp (method, "autolaunch") == 0)
308 *transport_p = _dbus_transport_new_for_autolaunch (error);
310 if (*transport_p == NULL)
312 _DBUS_ASSERT_ERROR_IS_SET (error);
313 return DBUS_TRANSPORT_OPEN_DID_NOT_CONNECT;
317 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
318 return DBUS_TRANSPORT_OPEN_OK;
323 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
324 return DBUS_TRANSPORT_OPEN_NOT_HANDLED;
328 static const struct {
329 DBusTransportOpenResult (* func) (DBusAddressEntry *entry,
330 DBusTransport **transport_p,
333 { _dbus_transport_open_socket },
334 { _dbus_transport_open_platform_specific },
335 { _dbus_transport_open_autolaunch }
336 #ifdef DBUS_BUILD_TESTS
337 , { _dbus_transport_open_debug_pipe }
342 * Try to open a new transport for the given address entry. (This
343 * opens a client-side-of-the-connection transport.)
345 * @param entry the address entry
346 * @param error location to store reason for failure.
347 * @returns new transport of #NULL on failure.
350 _dbus_transport_open (DBusAddressEntry *entry,
353 DBusTransport *transport;
354 const char *expected_guid_orig;
359 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
362 expected_guid_orig = dbus_address_entry_get_value (entry, "guid");
363 expected_guid = _dbus_strdup (expected_guid_orig);
365 if (expected_guid_orig != NULL && expected_guid == NULL)
367 _DBUS_SET_OOM (error);
371 dbus_error_init (&tmp_error);
372 for (i = 0; i < (int) _DBUS_N_ELEMENTS (open_funcs); ++i)
374 DBusTransportOpenResult result;
376 _DBUS_ASSERT_ERROR_IS_CLEAR (&tmp_error);
377 result = (* open_funcs[i].func) (entry, &transport, &tmp_error);
381 case DBUS_TRANSPORT_OPEN_OK:
382 _DBUS_ASSERT_ERROR_IS_CLEAR (&tmp_error);
385 case DBUS_TRANSPORT_OPEN_NOT_HANDLED:
386 _DBUS_ASSERT_ERROR_IS_CLEAR (&tmp_error);
387 /* keep going through the loop of open funcs */
389 case DBUS_TRANSPORT_OPEN_BAD_ADDRESS:
390 _DBUS_ASSERT_ERROR_IS_SET (&tmp_error);
393 case DBUS_TRANSPORT_OPEN_DID_NOT_CONNECT:
394 _DBUS_ASSERT_ERROR_IS_SET (&tmp_error);
402 if (transport == NULL)
404 if (!dbus_error_is_set (&tmp_error))
405 _dbus_set_bad_address (&tmp_error,
407 "Unknown address type (examples of valid types are \"tcp\" and on UNIX \"unix\")");
409 _DBUS_ASSERT_ERROR_IS_SET (&tmp_error);
410 dbus_move_error(&tmp_error, error);
411 dbus_free (expected_guid);
415 _DBUS_ASSERT_ERROR_IS_CLEAR (&tmp_error);
416 transport->expected_guid = expected_guid;
423 * Increments the reference count for the transport.
425 * @param transport the transport.
426 * @returns the transport.
429 _dbus_transport_ref (DBusTransport *transport)
431 _dbus_assert (transport->refcount > 0);
433 transport->refcount += 1;
439 * Decrements the reference count for the transport.
440 * Disconnects and finalizes the transport if
441 * the reference count reaches zero.
443 * @param transport the transport.
446 _dbus_transport_unref (DBusTransport *transport)
448 _dbus_assert (transport != NULL);
449 _dbus_assert (transport->refcount > 0);
451 transport->refcount -= 1;
452 if (transport->refcount == 0)
454 _dbus_verbose ("%s: finalizing\n", _DBUS_FUNCTION_NAME);
456 _dbus_assert (transport->vtable->finalize != NULL);
458 (* transport->vtable->finalize) (transport);
463 * Closes our end of the connection to a remote application. Further
464 * attempts to use this transport will fail. Only the first call to
465 * _dbus_transport_disconnect() will have an effect.
467 * @param transport the transport.
471 _dbus_transport_disconnect (DBusTransport *transport)
473 _dbus_verbose ("%s start\n", _DBUS_FUNCTION_NAME);
475 _dbus_assert (transport->vtable->disconnect != NULL);
477 if (transport->disconnected)
480 (* transport->vtable->disconnect) (transport);
482 transport->disconnected = TRUE;
484 _dbus_verbose ("%s end\n", _DBUS_FUNCTION_NAME);
488 * Returns #TRUE if the transport has not been disconnected.
489 * Disconnection can result from _dbus_transport_disconnect()
490 * or because the server drops its end of the connection.
492 * @param transport the transport.
493 * @returns whether we're connected
496 _dbus_transport_get_is_connected (DBusTransport *transport)
498 return !transport->disconnected;
502 auth_via_unix_user_function (DBusTransport *transport)
504 DBusCredentials *auth_identity;
506 DBusConnection *connection;
507 DBusAllowUnixUserFunction unix_user_function;
508 void *unix_user_data;
511 /* Dropping the lock here probably isn't that safe. */
513 auth_identity = _dbus_auth_get_identity (transport->auth);
514 _dbus_assert (auth_identity != NULL);
516 connection = transport->connection;
517 unix_user_function = transport->unix_user_function;
518 unix_user_data = transport->unix_user_data;
519 uid = _dbus_credentials_get_unix_uid (auth_identity),
521 _dbus_verbose ("unlock %s\n", _DBUS_FUNCTION_NAME);
522 _dbus_connection_unlock (connection);
524 allow = (* unix_user_function) (connection,
528 _dbus_verbose ("lock %s post unix user function\n", _DBUS_FUNCTION_NAME);
529 _dbus_connection_lock (connection);
533 _dbus_verbose ("Client UID "DBUS_UID_FORMAT" authorized\n", uid);
537 _dbus_verbose ("Client UID "DBUS_UID_FORMAT
538 " was rejected, disconnecting\n",
539 _dbus_credentials_get_unix_uid (auth_identity));
540 _dbus_transport_disconnect (transport);
547 auth_via_windows_user_function (DBusTransport *transport)
549 DBusCredentials *auth_identity;
551 DBusConnection *connection;
552 DBusAllowWindowsUserFunction windows_user_function;
553 void *windows_user_data;
556 /* Dropping the lock here probably isn't that safe. */
558 auth_identity = _dbus_auth_get_identity (transport->auth);
559 _dbus_assert (auth_identity != NULL);
561 connection = transport->connection;
562 windows_user_function = transport->windows_user_function;
563 windows_user_data = transport->unix_user_data;
564 windows_sid = _dbus_strdup (_dbus_credentials_get_windows_sid (auth_identity));
566 if (windows_sid == NULL)
572 _dbus_verbose ("unlock %s\n", _DBUS_FUNCTION_NAME);
573 _dbus_connection_unlock (connection);
575 allow = (* windows_user_function) (connection,
579 _dbus_verbose ("lock %s post windows user function\n", _DBUS_FUNCTION_NAME);
580 _dbus_connection_lock (connection);
584 _dbus_verbose ("Client SID '%s' authorized\n", windows_sid);
588 _dbus_verbose ("Client SID '%s' was rejected, disconnecting\n",
589 _dbus_credentials_get_windows_sid (auth_identity));
590 _dbus_transport_disconnect (transport);
597 auth_via_default_rules (DBusTransport *transport)
599 DBusCredentials *auth_identity;
600 DBusCredentials *our_identity;
603 auth_identity = _dbus_auth_get_identity (transport->auth);
604 _dbus_assert (auth_identity != NULL);
606 /* By default, connection is allowed if the client is
607 * 1) root or 2) has the same UID as us
610 our_identity = _dbus_credentials_new_from_current_process ();
611 if (our_identity == NULL)
617 if (_dbus_credentials_get_unix_uid (auth_identity) == 0 ||
618 _dbus_credentials_same_user (our_identity,
621 /* FIXME the verbose spam here is unix-specific */
622 _dbus_verbose ("Client authorized as UID "DBUS_UID_FORMAT
623 " matching our UID "DBUS_UID_FORMAT"\n",
624 _dbus_credentials_get_unix_uid(auth_identity),
625 _dbus_credentials_get_unix_uid(our_identity));
626 /* We have authenticated! */
631 /* FIXME the verbose spam here is unix-specific */
632 _dbus_verbose ("Client authorized as UID "DBUS_UID_FORMAT
633 " but our UID is "DBUS_UID_FORMAT", disconnecting\n",
634 _dbus_credentials_get_unix_uid(our_identity),
635 _dbus_credentials_get_unix_uid(our_identity));
636 _dbus_transport_disconnect (transport);
640 _dbus_credentials_unref (our_identity);
647 * Returns #TRUE if we have been authenticated. Will return #TRUE
648 * even if the transport is disconnected.
650 * @todo we drop connection->mutex when calling the unix_user_function,
651 * and windows_user_function, which may not be safe really.
653 * @param transport the transport
654 * @returns whether we're authenticated
657 _dbus_transport_get_is_authenticated (DBusTransport *transport)
659 if (transport->authenticated)
663 dbus_bool_t maybe_authenticated;
665 if (transport->disconnected)
668 /* paranoia ref since we call user callbacks sometimes */
669 _dbus_connection_ref_unlocked (transport->connection);
671 maybe_authenticated =
672 (!(transport->send_credentials_pending ||
673 transport->receive_credentials_pending));
675 if (maybe_authenticated)
677 switch (_dbus_auth_do_work (transport->auth))
679 case DBUS_AUTH_STATE_AUTHENTICATED:
680 /* leave as maybe_authenticated */
683 maybe_authenticated = FALSE;
687 /* If we're the client, verify the GUID
689 if (maybe_authenticated && !transport->is_server)
691 const char *server_guid;
693 server_guid = _dbus_auth_get_guid_from_server (transport->auth);
694 _dbus_assert (server_guid != NULL);
696 if (transport->expected_guid &&
697 strcmp (transport->expected_guid, server_guid) != 0)
699 _dbus_verbose ("Client expected GUID '%s' and we got '%s' from the server\n",
700 transport->expected_guid, server_guid);
701 _dbus_transport_disconnect (transport);
702 _dbus_connection_unref_unlocked (transport->connection);
706 if (transport->expected_guid == NULL)
708 transport->expected_guid = _dbus_strdup (server_guid);
710 if (transport->expected_guid == NULL)
712 _dbus_verbose ("No memory to complete auth in %s\n", _DBUS_FUNCTION_NAME);
718 /* If we're the server, see if we want to allow this identity to proceed.
720 if (maybe_authenticated && transport->is_server)
723 DBusCredentials *auth_identity;
725 auth_identity = _dbus_auth_get_identity (transport->auth);
726 _dbus_assert (auth_identity != NULL);
728 /* If we have an auth'd user and a user function, delegate
729 * deciding whether auth credentials are good enough to the
730 * app; otherwise, use our default decision process.
732 if (transport->unix_user_function != NULL &&
733 _dbus_credentials_include (auth_identity, DBUS_CREDENTIAL_UNIX_USER_ID))
735 allow = auth_via_unix_user_function (transport);
737 else if (transport->windows_user_function != NULL &&
738 _dbus_credentials_include (auth_identity, DBUS_CREDENTIAL_WINDOWS_SID))
740 allow = auth_via_windows_user_function (transport);
744 allow = auth_via_default_rules (transport);
748 maybe_authenticated = FALSE;
751 transport->authenticated = maybe_authenticated;
753 _dbus_connection_unref_unlocked (transport->connection);
754 return maybe_authenticated;
759 * Gets the address of a transport. It will be
760 * #NULL for a server-side transport.
762 * @param transport the transport
763 * @returns transport's address
766 _dbus_transport_get_address (DBusTransport *transport)
768 return transport->address;
772 * Handles a watch by reading data, writing data, or disconnecting
773 * the transport, as appropriate for the given condition.
775 * @param transport the transport.
776 * @param watch the watch.
777 * @param condition the current state of the watched file descriptor.
778 * @returns #FALSE if not enough memory to fully handle the watch
781 _dbus_transport_handle_watch (DBusTransport *transport,
783 unsigned int condition)
787 _dbus_assert (transport->vtable->handle_watch != NULL);
789 if (transport->disconnected)
792 if (dbus_watch_get_fd (watch) < 0)
794 _dbus_warn_check_failed ("Tried to handle an invalidated watch; this watch should have been removed\n");
798 _dbus_watch_sanitize_condition (watch, &condition);
800 _dbus_transport_ref (transport);
801 _dbus_watch_ref (watch);
802 retval = (* transport->vtable->handle_watch) (transport, watch, condition);
803 _dbus_watch_unref (watch);
804 _dbus_transport_unref (transport);
810 * Sets the connection using this transport. Allows the transport
811 * to add watches to the connection, queue incoming messages,
812 * and pull outgoing messages.
814 * @param transport the transport.
815 * @param connection the connection.
816 * @returns #FALSE if not enough memory
819 _dbus_transport_set_connection (DBusTransport *transport,
820 DBusConnection *connection)
822 _dbus_assert (transport->vtable->connection_set != NULL);
823 _dbus_assert (transport->connection == NULL);
825 transport->connection = connection;
827 _dbus_transport_ref (transport);
828 if (!(* transport->vtable->connection_set) (transport))
829 transport->connection = NULL;
830 _dbus_transport_unref (transport);
832 return transport->connection != NULL;
836 * Get the socket file descriptor, if any.
838 * @param transport the transport
839 * @param fd_p pointer to fill in with the descriptor
840 * @returns #TRUE if a descriptor was available
843 _dbus_transport_get_socket_fd (DBusTransport *transport,
848 if (transport->vtable->get_socket_fd == NULL)
851 if (transport->disconnected)
854 _dbus_transport_ref (transport);
856 retval = (* transport->vtable->get_socket_fd) (transport,
859 _dbus_transport_unref (transport);
865 * Performs a single poll()/select() on the transport's file
866 * descriptors and then reads/writes data as appropriate,
867 * queueing incoming messages and sending outgoing messages.
868 * This is the backend for _dbus_connection_do_iteration().
869 * See _dbus_connection_do_iteration() for full details.
871 * @param transport the transport.
872 * @param flags indicates whether to read or write, and whether to block.
873 * @param timeout_milliseconds if blocking, timeout or -1 for no timeout.
876 _dbus_transport_do_iteration (DBusTransport *transport,
878 int timeout_milliseconds)
880 _dbus_assert (transport->vtable->do_iteration != NULL);
882 _dbus_verbose ("Transport iteration flags 0x%x timeout %d connected = %d\n",
883 flags, timeout_milliseconds, !transport->disconnected);
885 if ((flags & (DBUS_ITERATION_DO_WRITING |
886 DBUS_ITERATION_DO_READING)) == 0)
887 return; /* Nothing to do */
889 if (transport->disconnected)
892 _dbus_transport_ref (transport);
893 (* transport->vtable->do_iteration) (transport, flags,
894 timeout_milliseconds);
895 _dbus_transport_unref (transport);
897 _dbus_verbose ("%s end\n", _DBUS_FUNCTION_NAME);
901 recover_unused_bytes (DBusTransport *transport)
903 if (_dbus_auth_needs_decoding (transport->auth))
905 DBusString plaintext;
906 const DBusString *encoded;
910 if (!_dbus_string_init (&plaintext))
913 _dbus_auth_get_unused_bytes (transport->auth,
916 if (!_dbus_auth_decode_data (transport->auth,
917 encoded, &plaintext))
919 _dbus_string_free (&plaintext);
923 _dbus_message_loader_get_buffer (transport->loader,
926 orig_len = _dbus_string_get_length (buffer);
928 if (!_dbus_string_move (&plaintext, 0, buffer,
931 _dbus_string_free (&plaintext);
935 _dbus_verbose (" %d unused bytes sent to message loader\n",
936 _dbus_string_get_length (buffer) -
939 _dbus_message_loader_return_buffer (transport->loader,
941 _dbus_string_get_length (buffer) -
944 _dbus_auth_delete_unused_bytes (transport->auth);
946 _dbus_string_free (&plaintext);
950 const DBusString *bytes;
953 dbus_bool_t succeeded;
955 _dbus_message_loader_get_buffer (transport->loader,
958 orig_len = _dbus_string_get_length (buffer);
960 _dbus_auth_get_unused_bytes (transport->auth,
964 if (!_dbus_string_copy (bytes, 0, buffer, _dbus_string_get_length (buffer)))
967 _dbus_verbose (" %d unused bytes sent to message loader\n",
968 _dbus_string_get_length (buffer) -
971 _dbus_message_loader_return_buffer (transport->loader,
973 _dbus_string_get_length (buffer) -
977 _dbus_auth_delete_unused_bytes (transport->auth);
985 _dbus_verbose ("Not enough memory to transfer unused bytes from auth conversation\n");
990 * Reports our current dispatch status (whether there's buffered
991 * data to be queued as messages, or not, or we need memory).
993 * @param transport the transport
994 * @returns current status
997 _dbus_transport_get_dispatch_status (DBusTransport *transport)
999 if (_dbus_counter_get_value (transport->live_messages_size) >= transport->max_live_messages_size)
1000 return DBUS_DISPATCH_COMPLETE; /* complete for now */
1002 if (!_dbus_transport_get_is_authenticated (transport))
1004 if (_dbus_auth_do_work (transport->auth) ==
1005 DBUS_AUTH_STATE_WAITING_FOR_MEMORY)
1006 return DBUS_DISPATCH_NEED_MEMORY;
1007 else if (!_dbus_transport_get_is_authenticated (transport))
1008 return DBUS_DISPATCH_COMPLETE;
1011 if (!transport->unused_bytes_recovered &&
1012 !recover_unused_bytes (transport))
1013 return DBUS_DISPATCH_NEED_MEMORY;
1015 transport->unused_bytes_recovered = TRUE;
1017 if (!_dbus_message_loader_queue_messages (transport->loader))
1018 return DBUS_DISPATCH_NEED_MEMORY;
1020 if (_dbus_message_loader_peek_message (transport->loader) != NULL)
1021 return DBUS_DISPATCH_DATA_REMAINS;
1023 return DBUS_DISPATCH_COMPLETE;
1027 * Processes data we've read while handling a watch, potentially
1028 * converting some of it to messages and queueing those messages on
1031 * @param transport the transport
1032 * @returns #TRUE if we had enough memory to queue all messages
1035 _dbus_transport_queue_messages (DBusTransport *transport)
1037 DBusDispatchStatus status;
1040 _dbus_verbose ("_dbus_transport_queue_messages()\n");
1043 /* Queue any messages */
1044 while ((status = _dbus_transport_get_dispatch_status (transport)) == DBUS_DISPATCH_DATA_REMAINS)
1046 DBusMessage *message;
1049 link = _dbus_message_loader_pop_message_link (transport->loader);
1050 _dbus_assert (link != NULL);
1052 message = link->data;
1054 _dbus_verbose ("queueing received message %p\n", message);
1056 if (!_dbus_message_add_size_counter (message, transport->live_messages_size))
1058 _dbus_message_loader_putback_message_link (transport->loader,
1060 status = DBUS_DISPATCH_NEED_MEMORY;
1065 /* pass ownership of link and message ref to connection */
1066 _dbus_connection_queue_received_message_link (transport->connection,
1071 if (_dbus_message_loader_get_is_corrupted (transport->loader))
1073 _dbus_verbose ("Corrupted message stream, disconnecting\n");
1074 _dbus_transport_disconnect (transport);
1077 return status != DBUS_DISPATCH_NEED_MEMORY;
1081 * See dbus_connection_set_max_message_size().
1083 * @param transport the transport
1084 * @param size the max size of a single message
1087 _dbus_transport_set_max_message_size (DBusTransport *transport,
1090 _dbus_message_loader_set_max_message_size (transport->loader, size);
1094 * See dbus_connection_get_max_message_size().
1096 * @param transport the transport
1097 * @returns max message size
1100 _dbus_transport_get_max_message_size (DBusTransport *transport)
1102 return _dbus_message_loader_get_max_message_size (transport->loader);
1106 * See dbus_connection_set_max_received_size().
1108 * @param transport the transport
1109 * @param size the max size of all incoming messages
1112 _dbus_transport_set_max_received_size (DBusTransport *transport,
1115 transport->max_live_messages_size = size;
1116 _dbus_counter_set_notify (transport->live_messages_size,
1117 transport->max_live_messages_size,
1118 live_messages_size_notify,
1124 * See dbus_connection_get_max_received_size().
1126 * @param transport the transport
1127 * @returns max bytes for all live messages
1130 _dbus_transport_get_max_received_size (DBusTransport *transport)
1132 return transport->max_live_messages_size;
1136 * See dbus_connection_get_unix_user().
1138 * @param transport the transport
1139 * @param uid return location for the user ID
1140 * @returns #TRUE if uid is filled in with a valid user ID
1143 _dbus_transport_get_unix_user (DBusTransport *transport,
1146 DBusCredentials *auth_identity;
1148 *uid = _DBUS_INT32_MAX; /* better than some root or system user in
1149 * case of bugs in the caller. Caller should
1150 * never use this value on purpose, however.
1153 if (!transport->authenticated)
1156 auth_identity = _dbus_auth_get_identity (transport->auth);
1158 if (_dbus_credentials_include (auth_identity,
1159 DBUS_CREDENTIAL_UNIX_USER_ID))
1161 *uid = _dbus_credentials_get_unix_uid (auth_identity);
1169 * See dbus_connection_get_unix_process_id().
1171 * @param transport the transport
1172 * @param pid return location for the process ID
1173 * @returns #TRUE if uid is filled in with a valid process ID
1176 _dbus_transport_get_unix_process_id (DBusTransport *transport,
1179 DBusCredentials *auth_identity;
1181 *pid = DBUS_PID_UNSET; /* Caller should never use this value on purpose,
1182 * but we set it to a safe number, INT_MAX,
1183 * just to root out possible bugs in bad callers.
1186 if (!transport->authenticated)
1189 auth_identity = _dbus_auth_get_identity (transport->auth);
1191 if (_dbus_credentials_include (auth_identity,
1192 DBUS_CREDENTIAL_UNIX_PROCESS_ID))
1194 *pid = _dbus_credentials_get_unix_pid (auth_identity);
1202 * See dbus_connection_set_unix_user_function().
1204 * @param transport the transport
1205 * @param function the predicate
1206 * @param data data to pass to the predicate
1207 * @param free_data_function function to free the data
1208 * @param old_data the old user data to be freed
1209 * @param old_free_data_function old free data function to free it with
1212 _dbus_transport_set_unix_user_function (DBusTransport *transport,
1213 DBusAllowUnixUserFunction function,
1215 DBusFreeFunction free_data_function,
1217 DBusFreeFunction *old_free_data_function)
1219 *old_data = transport->unix_user_data;
1220 *old_free_data_function = transport->free_unix_user_data;
1222 transport->unix_user_function = function;
1223 transport->unix_user_data = data;
1224 transport->free_unix_user_data = free_data_function;
1228 * See dbus_connection_get_windows_user().
1230 * @param transport the transport
1231 * @param windows_sid_p return location for the user ID
1232 * @returns #TRUE if user is available; the returned value may still be #NULL if no memory to copy it
1235 _dbus_transport_get_windows_user (DBusTransport *transport,
1236 char **windows_sid_p)
1238 DBusCredentials *auth_identity;
1240 *windows_sid_p = NULL;
1242 if (!transport->authenticated)
1245 auth_identity = _dbus_auth_get_identity (transport->auth);
1247 if (_dbus_credentials_include (auth_identity,
1248 DBUS_CREDENTIAL_WINDOWS_SID))
1250 /* If no memory, we are supposed to return TRUE and set NULL */
1251 *windows_sid_p = _dbus_strdup (_dbus_credentials_get_windows_sid (auth_identity));
1260 * See dbus_connection_set_windows_user_function().
1262 * @param transport the transport
1263 * @param function the predicate
1264 * @param data data to pass to the predicate
1265 * @param free_data_function function to free the data
1266 * @param old_data the old user data to be freed
1267 * @param old_free_data_function old free data function to free it with
1271 _dbus_transport_set_windows_user_function (DBusTransport *transport,
1272 DBusAllowWindowsUserFunction function,
1274 DBusFreeFunction free_data_function,
1276 DBusFreeFunction *old_free_data_function)
1278 *old_data = transport->windows_user_data;
1279 *old_free_data_function = transport->free_windows_user_data;
1281 transport->windows_user_function = function;
1282 transport->windows_user_data = data;
1283 transport->free_windows_user_data = free_data_function;
1287 * Sets the SASL authentication mechanisms supported by this transport.
1289 * @param transport the transport
1290 * @param mechanisms the #NULL-terminated array of mechanisms
1292 * @returns #FALSE if no memory
1295 _dbus_transport_set_auth_mechanisms (DBusTransport *transport,
1296 const char **mechanisms)
1298 return _dbus_auth_set_mechanisms (transport->auth, mechanisms);