/* -*- mode: C; c-file-style: "gnu" -*- */ /* dbus-transport.c DBusTransport object (internal to D-BUS implementation) * * Copyright (C) 2002, 2003 Red Hat Inc. * * Licensed under the Academic Free License version 2.1 * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * */ #include "dbus-transport-protected.h" #include "dbus-transport-unix.h" #include "dbus-connection-internal.h" #include "dbus-watch.h" #include "dbus-auth.h" #include "dbus-address.h" #ifdef DBUS_BUILD_TESTS #include "dbus-server-debug-pipe.h" #endif /** * @defgroup DBusTransport DBusTransport object * @ingroup DBusInternals * @brief "Backend" for a DBusConnection. * * Types and functions related to DBusTransport. A transport is an * abstraction that can send and receive data via various kinds of * network connections or other IPC mechanisms. * * @{ */ /** * @typedef DBusTransport * * Opaque object representing a way message stream. * DBusTransport abstracts various kinds of actual * transport mechanism, such as different network protocols, * or encryption schemes. */ static void live_messages_size_notify (DBusCounter *counter, void *user_data) { DBusTransport *transport = user_data; _dbus_transport_ref (transport); #if 0 _dbus_verbose ("Counter value is now %d\n", (int) _dbus_counter_get_value (counter)); #endif /* disable or re-enable the read watch for the transport if * required. */ if (* transport->vtable->live_messages_changed) (* transport->vtable->live_messages_changed) (transport); _dbus_transport_unref (transport); } /** * Initializes the base class members of DBusTransport. Chained up to * by subclasses in their constructor. The server GUID is the * globally unique ID for the server creating this connection * and will be #NULL for the client side of a connection. The GUID * is in hex format. * * @param transport the transport being created. * @param vtable the subclass vtable. * @param server_guid non-#NULL if this transport is on the server side of a connection * @param address the address of the transport * @returns #TRUE on success. */ dbus_bool_t _dbus_transport_init_base (DBusTransport *transport, const DBusTransportVTable *vtable, const DBusString *server_guid, const DBusString *address) { DBusMessageLoader *loader; DBusAuth *auth; DBusCounter *counter; char *address_copy; loader = _dbus_message_loader_new (); if (loader == NULL) return FALSE; if (server_guid) auth = _dbus_auth_server_new (server_guid); else auth = _dbus_auth_client_new (); if (auth == NULL) { _dbus_message_loader_unref (loader); return FALSE; } counter = _dbus_counter_new (); if (counter == NULL) { _dbus_auth_unref (auth); _dbus_message_loader_unref (loader); return FALSE; } if (server_guid) { _dbus_assert (address == NULL); address_copy = NULL; } else { _dbus_assert (address != NULL); if (!_dbus_string_copy_data (address, &address_copy)) { _dbus_counter_unref (counter); _dbus_auth_unref (auth); _dbus_message_loader_unref (loader); return FALSE; } } transport->refcount = 1; transport->vtable = vtable; transport->loader = loader; transport->auth = auth; transport->live_messages_size = counter; transport->authenticated = FALSE; transport->disconnected = FALSE; transport->is_server = (server_guid != NULL); transport->send_credentials_pending = !transport->is_server; transport->receive_credentials_pending = transport->is_server; transport->address = address_copy; transport->unix_user_function = NULL; transport->unix_user_data = NULL; transport->free_unix_user_data = NULL; transport->expected_guid = NULL; /* Try to default to something that won't totally hose the system, * but doesn't impose too much of a limitation. */ transport->max_live_messages_size = _DBUS_ONE_MEGABYTE * 63; transport->credentials.pid = -1; transport->credentials.uid = -1; transport->credentials.gid = -1; _dbus_counter_set_notify (transport->live_messages_size, transport->max_live_messages_size, live_messages_size_notify, transport); if (transport->address) _dbus_verbose ("Initialized transport on address %s\n", transport->address); return TRUE; } /** * Finalizes base class members of DBusTransport. * Chained up to from subclass finalizers. * * @param transport the transport. */ void _dbus_transport_finalize_base (DBusTransport *transport) { if (!transport->disconnected) _dbus_transport_disconnect (transport); if (transport->free_unix_user_data != NULL) (* transport->free_unix_user_data) (transport->unix_user_data); _dbus_message_loader_unref (transport->loader); _dbus_auth_unref (transport->auth); _dbus_counter_set_notify (transport->live_messages_size, 0, NULL, NULL); _dbus_counter_unref (transport->live_messages_size); dbus_free (transport->address); dbus_free (transport->expected_guid); } /** * Try to open a new transport for the given address entry. (This * opens a client-side-of-the-connection transport.) * * @param entry the address entry * @param error location to store reason for failure. * @returns new transport of #NULL on failure. */ DBusTransport* _dbus_transport_open (DBusAddressEntry *entry, DBusError *error) { DBusTransport *transport; const char *address_problem_type; const char *address_problem_field; const char *address_problem_other; const char *method; const char *expected_guid_orig; char *expected_guid; _DBUS_ASSERT_ERROR_IS_CLEAR (error); transport = NULL; address_problem_type = NULL; address_problem_field = NULL; address_problem_other = NULL; expected_guid_orig = dbus_address_entry_get_value (entry, "guid"); expected_guid = _dbus_strdup (expected_guid_orig); if (expected_guid_orig != NULL && expected_guid == NULL) { _DBUS_SET_OOM (error); return NULL; } method = dbus_address_entry_get_method (entry); _dbus_assert (method != NULL); if (strcmp (method, "unix") == 0) { const char *path = dbus_address_entry_get_value (entry, "path"); const char *tmpdir = dbus_address_entry_get_value (entry, "tmpdir"); const char *abstract = dbus_address_entry_get_value (entry, "abstract"); if (tmpdir != NULL) { address_problem_other = "cannot use the \"tmpdir\" option for an address to connect to, only in an address to listen on"; goto bad_address; } if (path == NULL && abstract == NULL) { address_problem_type = "unix"; address_problem_field = "path or abstract"; goto bad_address; } if (path != NULL && abstract != NULL) { address_problem_other = "can't specify both \"path\" and \"abstract\" options in an address"; goto bad_address; } if (path) transport = _dbus_transport_new_for_domain_socket (path, FALSE, error); else transport = _dbus_transport_new_for_domain_socket (abstract, TRUE, error); } else if (strcmp (method, "tcp") == 0) { const char *host = dbus_address_entry_get_value (entry, "host"); const char *port = dbus_address_entry_get_value (entry, "port"); DBusString str; long lport; dbus_bool_t sresult; if (port == NULL) { address_problem_type = "tcp"; address_problem_field = "port"; goto bad_address; } _dbus_string_init_const (&str, port); sresult = _dbus_string_parse_int (&str, 0, &lport, NULL); _dbus_string_free (&str); if (sresult == FALSE || lport <= 0 || lport > 65535) { address_problem_other = "Port is not an integer between 0 and 65535"; goto bad_address; } transport = _dbus_transport_new_for_tcp_socket (host, lport, error); } #ifdef DBUS_BUILD_TESTS else if (strcmp (method, "debug-pipe") == 0) { const char *name = dbus_address_entry_get_value (entry, "name"); if (name == NULL) { address_problem_type = "debug-pipe"; address_problem_field = "name"; goto bad_address; } transport = _dbus_transport_debug_pipe_new (name, error); } #endif else { address_problem_other = "Unknown address type (examples of valid types are \"unix\" and \"tcp\")"; goto bad_address; } if (transport == NULL) { _DBUS_ASSERT_ERROR_IS_SET (error); dbus_free (expected_guid); } else { transport->expected_guid = expected_guid; } return transport; bad_address: dbus_free (expected_guid); if (address_problem_type != NULL) dbus_set_error (error, DBUS_ERROR_BAD_ADDRESS, "Address of type %s was missing argument %s", address_problem_type, address_problem_field); else dbus_set_error (error, DBUS_ERROR_BAD_ADDRESS, "Could not parse address: %s", address_problem_other); return NULL; } /** * Increments the reference count for the transport. * * @param transport the transport. * @returns the transport. */ DBusTransport * _dbus_transport_ref (DBusTransport *transport) { _dbus_assert (transport->refcount > 0); transport->refcount += 1; return transport; } /** * Decrements the reference count for the transport. * Disconnects and finalizes the transport if * the reference count reaches zero. * * @param transport the transport. */ void _dbus_transport_unref (DBusTransport *transport) { _dbus_assert (transport != NULL); _dbus_assert (transport->refcount > 0); transport->refcount -= 1; if (transport->refcount == 0) { _dbus_verbose ("%s: finalizing\n", _DBUS_FUNCTION_NAME); _dbus_assert (transport->vtable->finalize != NULL); (* transport->vtable->finalize) (transport); } } /** * Closes our end of the connection to a remote application. Further * attempts to use this transport will fail. Only the first call to * _dbus_transport_disconnect() will have an effect. * * @param transport the transport. * */ void _dbus_transport_disconnect (DBusTransport *transport) { _dbus_verbose ("%s start\n", _DBUS_FUNCTION_NAME); _dbus_assert (transport->vtable->disconnect != NULL); if (transport->disconnected) return; (* transport->vtable->disconnect) (transport); transport->disconnected = TRUE; _dbus_verbose ("%s end\n", _DBUS_FUNCTION_NAME); } /** * Returns #TRUE if the transport has not been disconnected. * Disconnection can result from _dbus_transport_disconnect() * or because the server drops its end of the connection. * * @param transport the transport. * @returns whether we're connected */ dbus_bool_t _dbus_transport_get_is_connected (DBusTransport *transport) { return !transport->disconnected; } /** * Returns #TRUE if we have been authenticated. Will return #TRUE * even if the transport is disconnected. * * @todo we drop connection->mutex when calling the unix_user_function, * which may not be safe really. * * @param transport the transport * @returns whether we're authenticated */ dbus_bool_t _dbus_transport_get_is_authenticated (DBusTransport *transport) { if (transport->authenticated) return TRUE; else { dbus_bool_t maybe_authenticated; if (transport->disconnected) return FALSE; /* paranoia ref since we call user callbacks sometimes */ _dbus_connection_ref_unlocked (transport->connection); maybe_authenticated = (!(transport->send_credentials_pending || transport->receive_credentials_pending)); if (maybe_authenticated) { switch (_dbus_auth_do_work (transport->auth)) { case DBUS_AUTH_STATE_AUTHENTICATED: /* leave as maybe_authenticated */ break; default: maybe_authenticated = FALSE; } } if (maybe_authenticated && !transport->is_server) { const char *server_guid; server_guid = _dbus_auth_get_guid_from_server (transport->auth); _dbus_assert (server_guid != NULL); if (transport->expected_guid && strcmp (transport->expected_guid, server_guid) != 0) { _dbus_verbose ("Client expected GUID '%s' and we got '%s' from the server\n", transport->expected_guid, server_guid); _dbus_transport_disconnect (transport); _dbus_connection_unref_unlocked (transport->connection); return FALSE; } if (transport->expected_guid == NULL) { transport->expected_guid = _dbus_strdup (server_guid); if (transport->expected_guid == NULL) { _dbus_verbose ("No memory to complete auth in %s\n", _DBUS_FUNCTION_NAME); return FALSE; } } } /* If we've authenticated as some identity, check that the auth * identity is the same as our own identity. In the future, we * may have API allowing applications to specify how this is * done, for example they may allow connection as any identity, * but then impose restrictions on certain identities. * Or they may give certain identities extra privileges. */ if (maybe_authenticated && transport->is_server) { DBusCredentials auth_identity; _dbus_auth_get_identity (transport->auth, &auth_identity); if (transport->unix_user_function != NULL) { dbus_bool_t allow; DBusConnection *connection; DBusAllowUnixUserFunction unix_user_function; void *unix_user_data; /* Dropping the lock here probably isn't that safe. */ connection = transport->connection; unix_user_function = transport->unix_user_function; unix_user_data = transport->unix_user_data; _dbus_verbose ("unlock %s\n", _DBUS_FUNCTION_NAME); _dbus_connection_unlock (connection); allow = (* unix_user_function) (connection, auth_identity.uid, unix_user_data); _dbus_verbose ("lock %s post unix user function\n", _DBUS_FUNCTION_NAME); _dbus_connection_lock (connection); if (allow) { _dbus_verbose ("Client UID "DBUS_UID_FORMAT" authorized\n", auth_identity.uid); } else { _dbus_verbose ("Client UID "DBUS_UID_FORMAT " was rejected, disconnecting\n", auth_identity.uid); _dbus_transport_disconnect (transport); _dbus_connection_unref_unlocked (connection); return FALSE; } } else { DBusCredentials our_identity; _dbus_credentials_from_current_process (&our_identity); if (!_dbus_credentials_match (&our_identity, &auth_identity)) { _dbus_verbose ("Client authorized as UID "DBUS_UID_FORMAT " but our UID is "DBUS_UID_FORMAT", disconnecting\n", auth_identity.uid, our_identity.uid); _dbus_transport_disconnect (transport); _dbus_connection_unref_unlocked (transport->connection); return FALSE; } else { _dbus_verbose ("Client authorized as UID "DBUS_UID_FORMAT " matching our UID "DBUS_UID_FORMAT"\n", auth_identity.uid, our_identity.uid); } } } transport->authenticated = maybe_authenticated; _dbus_connection_unref_unlocked (transport->connection); return maybe_authenticated; } } /** * Gets the address of a transport. It will be * #NULL for a server-side transport. * * @param transport the transport * @returns transport's address */ const char* _dbus_transport_get_address (DBusTransport *transport) { return transport->address; } /** * Handles a watch by reading data, writing data, or disconnecting * the transport, as appropriate for the given condition. * * @param transport the transport. * @param watch the watch. * @param condition the current state of the watched file descriptor. * @returns #FALSE if not enough memory to fully handle the watch */ dbus_bool_t _dbus_transport_handle_watch (DBusTransport *transport, DBusWatch *watch, unsigned int condition) { dbus_bool_t retval; _dbus_assert (transport->vtable->handle_watch != NULL); if (transport->disconnected) return TRUE; if (dbus_watch_get_fd (watch) < 0) { _dbus_warn ("Tried to handle an invalidated watch; this watch should have been removed\n"); return TRUE; } _dbus_watch_sanitize_condition (watch, &condition); _dbus_transport_ref (transport); _dbus_watch_ref (watch); retval = (* transport->vtable->handle_watch) (transport, watch, condition); _dbus_watch_unref (watch); _dbus_transport_unref (transport); return retval; } /** * Sets the connection using this transport. Allows the transport * to add watches to the connection, queue incoming messages, * and pull outgoing messages. * * @param transport the transport. * @param connection the connection. * @returns #FALSE if not enough memory */ dbus_bool_t _dbus_transport_set_connection (DBusTransport *transport, DBusConnection *connection) { _dbus_assert (transport->vtable->connection_set != NULL); _dbus_assert (transport->connection == NULL); transport->connection = connection; _dbus_transport_ref (transport); if (!(* transport->vtable->connection_set) (transport)) transport->connection = NULL; _dbus_transport_unref (transport); return transport->connection != NULL; } /** * Get the UNIX file descriptor, if any. * * @param transport the transport * @param fd_p pointer to fill in with the descriptor * @returns #TRUE if a descriptor was available */ dbus_bool_t _dbus_transport_get_unix_fd (DBusTransport *transport, int *fd_p) { dbus_bool_t retval; if (transport->vtable->get_unix_fd == NULL) return FALSE; if (transport->disconnected) return FALSE; _dbus_transport_ref (transport); retval = (* transport->vtable->get_unix_fd) (transport, fd_p); _dbus_transport_unref (transport); return retval; } /** * Performs a single poll()/select() on the transport's file * descriptors and then reads/writes data as appropriate, * queueing incoming messages and sending outgoing messages. * This is the backend for _dbus_connection_do_iteration(). * See _dbus_connection_do_iteration() for full details. * * @param transport the transport. * @param flags indicates whether to read or write, and whether to block. * @param timeout_milliseconds if blocking, timeout or -1 for no timeout. */ void _dbus_transport_do_iteration (DBusTransport *transport, unsigned int flags, int timeout_milliseconds) { _dbus_assert (transport->vtable->do_iteration != NULL); _dbus_verbose ("Transport iteration flags 0x%x timeout %d connected = %d\n", flags, timeout_milliseconds, !transport->disconnected); if ((flags & (DBUS_ITERATION_DO_WRITING | DBUS_ITERATION_DO_READING)) == 0) return; /* Nothing to do */ if (transport->disconnected) return; _dbus_transport_ref (transport); (* transport->vtable->do_iteration) (transport, flags, timeout_milliseconds); _dbus_transport_unref (transport); _dbus_verbose ("%s end\n", _DBUS_FUNCTION_NAME); } static dbus_bool_t recover_unused_bytes (DBusTransport *transport) { if (_dbus_auth_needs_decoding (transport->auth)) { DBusString plaintext; const DBusString *encoded; DBusString *buffer; int orig_len; if (!_dbus_string_init (&plaintext)) goto nomem; _dbus_auth_get_unused_bytes (transport->auth, &encoded); if (!_dbus_auth_decode_data (transport->auth, encoded, &plaintext)) { _dbus_string_free (&plaintext); goto nomem; } _dbus_message_loader_get_buffer (transport->loader, &buffer); orig_len = _dbus_string_get_length (buffer); if (!_dbus_string_move (&plaintext, 0, buffer, orig_len)) { _dbus_string_free (&plaintext); goto nomem; } _dbus_verbose (" %d unused bytes sent to message loader\n", _dbus_string_get_length (buffer) - orig_len); _dbus_message_loader_return_buffer (transport->loader, buffer, _dbus_string_get_length (buffer) - orig_len); _dbus_auth_delete_unused_bytes (transport->auth); _dbus_string_free (&plaintext); } else { const DBusString *bytes; DBusString *buffer; int orig_len; dbus_bool_t succeeded; _dbus_message_loader_get_buffer (transport->loader, &buffer); orig_len = _dbus_string_get_length (buffer); _dbus_auth_get_unused_bytes (transport->auth, &bytes); succeeded = TRUE; if (!_dbus_string_copy (bytes, 0, buffer, _dbus_string_get_length (buffer))) succeeded = FALSE; _dbus_verbose (" %d unused bytes sent to message loader\n", _dbus_string_get_length (buffer) - orig_len); _dbus_message_loader_return_buffer (transport->loader, buffer, _dbus_string_get_length (buffer) - orig_len); if (succeeded) _dbus_auth_delete_unused_bytes (transport->auth); else goto nomem; } return TRUE; nomem: _dbus_verbose ("Not enough memory to transfer unused bytes from auth conversation\n"); return FALSE; } /** * Reports our current dispatch status (whether there's buffered * data to be queued as messages, or not, or we need memory). * * @param transport the transport * @returns current status */ DBusDispatchStatus _dbus_transport_get_dispatch_status (DBusTransport *transport) { if (_dbus_counter_get_value (transport->live_messages_size) >= transport->max_live_messages_size) return DBUS_DISPATCH_COMPLETE; /* complete for now */ if (!_dbus_transport_get_is_authenticated (transport)) { if (_dbus_auth_do_work (transport->auth) == DBUS_AUTH_STATE_WAITING_FOR_MEMORY) return DBUS_DISPATCH_NEED_MEMORY; else if (!_dbus_transport_get_is_authenticated (transport)) return DBUS_DISPATCH_COMPLETE; } if (!transport->unused_bytes_recovered && !recover_unused_bytes (transport)) return DBUS_DISPATCH_NEED_MEMORY; transport->unused_bytes_recovered = TRUE; if (!_dbus_message_loader_queue_messages (transport->loader)) return DBUS_DISPATCH_NEED_MEMORY; if (_dbus_message_loader_peek_message (transport->loader) != NULL) return DBUS_DISPATCH_DATA_REMAINS; else return DBUS_DISPATCH_COMPLETE; } /** * Processes data we've read while handling a watch, potentially * converting some of it to messages and queueing those messages on * the connection. * * @param transport the transport * @returns #TRUE if we had enough memory to queue all messages */ dbus_bool_t _dbus_transport_queue_messages (DBusTransport *transport) { DBusDispatchStatus status; #if 0 _dbus_verbose ("_dbus_transport_queue_messages()\n"); #endif /* Queue any messages */ while ((status = _dbus_transport_get_dispatch_status (transport)) == DBUS_DISPATCH_DATA_REMAINS) { DBusMessage *message; DBusList *link; link = _dbus_message_loader_pop_message_link (transport->loader); _dbus_assert (link != NULL); message = link->data; _dbus_verbose ("queueing received message %p\n", message); if (!_dbus_message_add_size_counter (message, transport->live_messages_size)) { _dbus_message_loader_putback_message_link (transport->loader, link); status = DBUS_DISPATCH_NEED_MEMORY; break; } else { /* pass ownership of link and message ref to connection */ _dbus_connection_queue_received_message_link (transport->connection, link); } } if (_dbus_message_loader_get_is_corrupted (transport->loader)) { _dbus_verbose ("Corrupted message stream, disconnecting\n"); _dbus_transport_disconnect (transport); } return status != DBUS_DISPATCH_NEED_MEMORY; } /** * See dbus_connection_set_max_message_size(). * * @param transport the transport * @param size the max size of a single message */ void _dbus_transport_set_max_message_size (DBusTransport *transport, long size) { _dbus_message_loader_set_max_message_size (transport->loader, size); } /** * See dbus_connection_get_max_message_size(). * * @param transport the transport * @returns max message size */ long _dbus_transport_get_max_message_size (DBusTransport *transport) { return _dbus_message_loader_get_max_message_size (transport->loader); } /** * See dbus_connection_set_max_received_size(). * * @param transport the transport * @param size the max size of all incoming messages */ void _dbus_transport_set_max_received_size (DBusTransport *transport, long size) { transport->max_live_messages_size = size; _dbus_counter_set_notify (transport->live_messages_size, transport->max_live_messages_size, live_messages_size_notify, transport); } /** * See dbus_connection_get_max_received_size(). * * @param transport the transport * @returns max bytes for all live messages */ long _dbus_transport_get_max_received_size (DBusTransport *transport) { return transport->max_live_messages_size; } /** * See dbus_connection_get_unix_user(). * * @param transport the transport * @param uid return location for the user ID * @returns #TRUE if uid is filled in with a valid user ID */ dbus_bool_t _dbus_transport_get_unix_user (DBusTransport *transport, unsigned long *uid) { DBusCredentials auth_identity; *uid = _DBUS_INT32_MAX; /* better than some root or system user in * case of bugs in the caller. Caller should * never use this value on purpose, however. */ if (!transport->authenticated) return FALSE; _dbus_auth_get_identity (transport->auth, &auth_identity); if (auth_identity.uid != DBUS_UID_UNSET) { *uid = auth_identity.uid; return TRUE; } else return FALSE; } /** * See dbus_connection_get_unix_process_id(). * * @param transport the transport * @param pid return location for the process ID * @returns #TRUE if uid is filled in with a valid process ID */ dbus_bool_t _dbus_transport_get_unix_process_id (DBusTransport *transport, unsigned long *pid) { DBusCredentials auth_identity; *pid = DBUS_PID_UNSET; /* Caller should never use this value on purpose, * but we set it to a safe number, INT_MAX, * just to root out possible bugs in bad callers. */ if (!transport->authenticated) return FALSE; _dbus_auth_get_identity (transport->auth, &auth_identity); if (auth_identity.pid != DBUS_PID_UNSET) { *pid = auth_identity.pid; return TRUE; } else return FALSE; } /** * See dbus_connection_set_unix_user_function(). * * @param transport the transport * @param function the predicate * @param data data to pass to the predicate * @param free_data_function function to free the data * @param old_data the old user data to be freed * @param old_free_data_function old free data function to free it with */ void _dbus_transport_set_unix_user_function (DBusTransport *transport, DBusAllowUnixUserFunction function, void *data, DBusFreeFunction free_data_function, void **old_data, DBusFreeFunction *old_free_data_function) { *old_data = transport->unix_user_data; *old_free_data_function = transport->free_unix_user_data; transport->unix_user_function = function; transport->unix_user_data = data; transport->free_unix_user_data = free_data_function; } /** * Sets the SASL authentication mechanisms supported by this transport. * * @param transport the transport * @param mechanisms the #NULL-terminated array of mechanisms * * @returns #FALSE if no memory */ dbus_bool_t _dbus_transport_set_auth_mechanisms (DBusTransport *transport, const char **mechanisms) { return _dbus_auth_set_mechanisms (transport->auth, mechanisms); } /** @} */