1 /* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
2 /* dbus-server-socket.c Server implementation for sockets
4 * Copyright (C) 2002, 2003, 2004, 2006 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
25 #include "dbus-internals.h"
26 #include "dbus-server-socket.h"
27 #include "dbus-transport-socket.h"
28 #include "dbus-connection-internal.h"
29 #include "dbus-memory.h"
30 #include "dbus-nonce.h"
31 #include "dbus-string.h"
34 * @defgroup DBusServerSocket DBusServer implementations for SOCKET
35 * @ingroup DBusInternals
36 * @brief Implementation details of DBusServer on SOCKET
42 * Opaque object representing a Socket server implementation.
44 typedef struct DBusServerSocket DBusServerSocket;
47 * Implementation details of DBusServerSocket. All members
50 struct DBusServerSocket
52 DBusServer base; /**< Parent class members. */
53 int n_fds; /**< Number of active file handles */
54 DBusSocket *fds; /**< File descriptor or DBUS_SOCKET_INVALID if disconnected. */
55 DBusWatch **watch; /**< File descriptor watch. */
56 char *socket_name; /**< Name of domain socket, to unlink if appropriate */
57 DBusNonceFile *noncefile; /**< Nonce file used to authenticate clients */
61 socket_finalize (DBusServer *server)
63 DBusServerSocket *socket_server = (DBusServerSocket*) server;
66 _dbus_server_finalize_base (server);
68 for (i = 0 ; i < socket_server->n_fds ; i++)
69 if (socket_server->watch[i])
71 _dbus_watch_unref (socket_server->watch[i]);
72 socket_server->watch[i] = NULL;
75 dbus_free (socket_server->fds);
76 dbus_free (socket_server->watch);
77 dbus_free (socket_server->socket_name);
78 if (socket_server->noncefile)
79 _dbus_noncefile_delete (socket_server->noncefile, NULL);
80 dbus_free (socket_server->noncefile);
84 /* Return value is just for memory, not other failures. */
86 handle_new_client_fd_and_unlock (DBusServer *server,
89 DBusConnection *connection;
90 DBusTransport *transport;
91 DBusNewConnectionFunction new_connection_function;
92 void *new_connection_data;
94 _dbus_verbose ("Creating new client connection with fd %" DBUS_SOCKET_FORMAT "\n",
95 _dbus_socket_printable (client_fd));
97 HAVE_LOCK_CHECK (server);
99 if (!_dbus_set_socket_nonblocking (client_fd, NULL))
101 SERVER_UNLOCK (server);
105 transport = _dbus_transport_new_for_socket (client_fd, &server->guid_hex, NULL);
106 if (transport == NULL)
108 _dbus_close_socket (client_fd, NULL);
109 SERVER_UNLOCK (server);
113 if (!_dbus_transport_set_auth_mechanisms (transport,
114 (const char **) server->auth_mechanisms))
116 _dbus_transport_unref (transport);
117 SERVER_UNLOCK (server);
121 /* note that client_fd is now owned by the transport, and will be
122 * closed on transport disconnection/finalization
125 connection = _dbus_connection_new_for_transport (transport);
126 _dbus_transport_unref (transport);
127 transport = NULL; /* now under the connection lock */
129 if (connection == NULL)
131 SERVER_UNLOCK (server);
135 /* See if someone wants to handle this new connection, self-referencing
138 new_connection_function = server->new_connection_function;
139 new_connection_data = server->new_connection_data;
141 _dbus_server_ref_unlocked (server);
142 SERVER_UNLOCK (server);
144 if (new_connection_function)
146 (* new_connection_function) (server, connection,
147 new_connection_data);
149 dbus_server_unref (server);
151 /* If no one grabbed a reference, the connection will die. */
152 _dbus_connection_close_if_only_one_ref (connection);
153 dbus_connection_unref (connection);
159 socket_handle_watch (DBusWatch *watch,
163 DBusServer *server = data;
164 DBusServerSocket *socket_server = data;
166 #ifndef DBUS_DISABLE_ASSERT
168 dbus_bool_t found = FALSE;
171 SERVER_LOCK (server);
173 #ifndef DBUS_DISABLE_ASSERT
174 for (i = 0 ; i < socket_server->n_fds ; i++)
176 if (socket_server->watch[i] == watch)
179 _dbus_assert (found);
182 _dbus_verbose ("Handling client connection, flags 0x%x\n", flags);
184 if (flags & DBUS_WATCH_READABLE)
186 DBusSocket client_fd;
187 DBusSocket listen_fd;
190 listen_fd = _dbus_watch_get_socket (watch);
192 if (socket_server->noncefile)
193 client_fd = _dbus_accept_with_noncefile (listen_fd, socket_server->noncefile);
195 client_fd = _dbus_accept (listen_fd);
197 saved_errno = _dbus_save_socket_errno ();
199 if (!_dbus_socket_is_valid (client_fd))
201 /* EINTR handled for us */
203 if (_dbus_get_is_errno_eagain_or_ewouldblock (saved_errno))
204 _dbus_verbose ("No client available to accept after all\n");
206 _dbus_verbose ("Failed to accept a client connection: %s\n",
207 _dbus_strerror (saved_errno));
209 SERVER_UNLOCK (server);
213 if (!handle_new_client_fd_and_unlock (server, client_fd))
214 _dbus_verbose ("Rejected client connection due to lack of memory\n");
218 if (flags & DBUS_WATCH_ERROR)
219 _dbus_verbose ("Error on server listening socket\n");
221 if (flags & DBUS_WATCH_HANGUP)
222 _dbus_verbose ("Hangup on server listening socket\n");
228 socket_disconnect (DBusServer *server)
230 DBusServerSocket *socket_server = (DBusServerSocket*) server;
233 HAVE_LOCK_CHECK (server);
235 for (i = 0 ; i < socket_server->n_fds ; i++)
237 if (socket_server->watch[i])
239 _dbus_server_remove_watch (server,
240 socket_server->watch[i]);
241 _dbus_watch_invalidate (socket_server->watch[i]);
242 _dbus_watch_unref (socket_server->watch[i]);
243 socket_server->watch[i] = NULL;
246 if (_dbus_socket_is_valid (socket_server->fds[i]))
248 _dbus_close_socket (socket_server->fds[i], NULL);
249 _dbus_socket_invalidate (&socket_server->fds[i]);
253 if (socket_server->socket_name != NULL)
256 _dbus_string_init_const (&tmp, socket_server->socket_name);
257 _dbus_delete_file (&tmp, NULL);
260 if (server->published_address)
261 _dbus_daemon_unpublish_session_bus_address();
263 HAVE_LOCK_CHECK (server);
266 static const DBusServerVTable socket_vtable = {
272 * Creates a new server listening on the given file descriptor. The
273 * file descriptor should be nonblocking (use
274 * _dbus_set_fd_nonblocking() to make it so). The file descriptor
275 * should be listening for connections, that is, listen() should have
276 * been successfully invoked on it. The server will use accept() to
277 * accept new client connections.
279 * @param fds list of file descriptors.
280 * @param n_fds number of file descriptors
281 * @param address the server's address
282 * @param noncefile to be used for authentication (NULL if not needed)
283 * @param error location to store reason for failure
284 * @returns the new server, or #NULL on OOM or other error.
288 _dbus_server_new_for_socket (DBusSocket *fds,
290 const DBusString *address,
291 DBusNonceFile *noncefile,
294 DBusServerSocket *socket_server;
298 socket_server = dbus_new0 (DBusServerSocket, 1);
299 if (socket_server == NULL)
302 socket_server->noncefile = noncefile;
304 socket_server->fds = dbus_new (DBusSocket, n_fds);
305 if (!socket_server->fds)
308 socket_server->watch = dbus_new0 (DBusWatch *, n_fds);
309 if (!socket_server->watch)
312 for (i = 0 ; i < n_fds ; i++)
316 watch = _dbus_watch_new (_dbus_socket_get_pollable (fds[i]),
319 socket_handle_watch, socket_server,
324 socket_server->n_fds++;
325 socket_server->fds[i] = fds[i];
326 socket_server->watch[i] = watch;
329 if (!_dbus_server_init_base (&socket_server->base,
330 &socket_vtable, address,
334 server = (DBusServer*)socket_server;
336 SERVER_LOCK (server);
338 for (i = 0 ; i < n_fds ; i++)
340 if (!_dbus_server_add_watch (&socket_server->base,
341 socket_server->watch[i]))
345 /* The caller is still responsible for closing the fds until
346 * we return successfully, so don't let socket_disconnect()
348 for (j = 0; j < n_fds; j++)
349 _dbus_socket_invalidate (&socket_server->fds[j]);
351 /* socket_disconnect() will try to remove all the watches;
352 * make sure it doesn't see the ones that weren't even added
354 for (j = i; j < n_fds; j++)
356 _dbus_watch_invalidate (socket_server->watch[j]);
357 _dbus_watch_unref (socket_server->watch[j]);
358 socket_server->watch[j] = NULL;
361 _dbus_server_disconnect_unlocked (server);
362 SERVER_UNLOCK (server);
363 _dbus_server_finalize_base (&socket_server->base);
368 SERVER_UNLOCK (server);
370 _dbus_server_trace_ref (&socket_server->base, 0, 1, "new_for_socket");
371 return (DBusServer*) socket_server;
374 for (i = 0 ; i < n_fds ; i++)
376 if (socket_server->watch[i] != NULL)
378 _dbus_watch_invalidate (socket_server->watch[i]);
379 _dbus_watch_unref (socket_server->watch[i]);
380 socket_server->watch[i] = NULL;
383 dbus_free (socket_server->watch);
386 dbus_free (socket_server->fds);
389 dbus_free (socket_server);
391 if (error != NULL && !dbus_error_is_set (error))
392 _DBUS_SET_OOM (error);
398 * Creates a new server listening on TCP.
399 * If host is NULL, it will default to localhost.
400 * If bind is NULL, it will default to the value for the host
401 * parameter, and if that is NULL, then localhost
402 * If bind is a hostname, it will be resolved and will listen
403 * on all returned addresses.
404 * If family is NULL, hostname resolution will try all address
405 * families, otherwise it can be ipv4 or ipv6 to restrict the
406 * addresses considered.
408 * @param host the hostname to report for the listen address
409 * @param bind the hostname to listen on
410 * @param port the port to listen on or 0 to let the OS choose
412 * @param error location to store reason for failure.
413 * @param use_nonce whether to use a nonce for low-level authentication (nonce-tcp transport) or not (tcp transport)
414 * @returns the new server, or #NULL on failure.
417 _dbus_server_new_for_tcp_socket (const char *host,
422 dbus_bool_t use_nonce)
425 DBusSocket *listen_fds = NULL;
426 int nlisten_fds = 0, i;
430 DBusNonceFile *noncefile;
432 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
436 if (!_dbus_string_init (&address))
438 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
442 if (!_dbus_string_init (&port_str))
444 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
456 else if (strcmp (bind, "*") == 0)
459 nlisten_fds =_dbus_listen_tcp_socket (bind, port, family,
462 if (nlisten_fds <= 0)
464 _DBUS_ASSERT_ERROR_IS_SET(error);
468 _dbus_string_init_const (&host_str, host);
469 if (!_dbus_string_append (&address, use_nonce ? "nonce-tcp:host=" : "tcp:host=") ||
470 !_dbus_address_append_escaped (&address, &host_str) ||
471 !_dbus_string_append (&address, ",port=") ||
472 !_dbus_string_append (&address, _dbus_string_get_const_data(&port_str)))
474 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
478 (!_dbus_string_append (&address, ",family=") ||
479 !_dbus_string_append (&address, family)))
481 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
487 noncefile = dbus_new0 (DBusNonceFile, 1);
488 if (noncefile == NULL)
490 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
494 if (!_dbus_noncefile_create (noncefile, error))
497 if (!_dbus_string_append (&address, ",noncefile=") ||
498 !_dbus_address_append_escaped (&address, _dbus_noncefile_get_path (noncefile)))
500 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
506 server = _dbus_server_new_for_socket (listen_fds, nlisten_fds, &address, noncefile, error);
509 if (noncefile != NULL)
515 _dbus_string_free (&port_str);
516 _dbus_string_free (&address);
517 dbus_free(listen_fds);
522 _dbus_noncefile_delete (noncefile, NULL);
525 dbus_free (noncefile);
528 for (i = 0 ; i < nlisten_fds ; i++)
529 _dbus_close_socket (listen_fds[i], NULL);
530 dbus_free(listen_fds);
533 _dbus_string_free (&port_str);
536 _dbus_string_free (&address);
542 * Tries to interpret the address entry for various socket-related
543 * addresses (well, currently only tcp and nonce-tcp).
545 * Sets error if the result is not OK.
547 * @param entry an address entry
548 * @param server_p a new DBusServer, or #NULL on failure.
549 * @param error location to store rationale for failure on bad address
550 * @returns the outcome
553 DBusServerListenResult
554 _dbus_server_listen_socket (DBusAddressEntry *entry,
555 DBusServer **server_p,
562 method = dbus_address_entry_get_method (entry);
564 if (strcmp (method, "tcp") == 0 || strcmp (method, "nonce-tcp") == 0)
571 host = dbus_address_entry_get_value (entry, "host");
572 bind = dbus_address_entry_get_value (entry, "bind");
573 port = dbus_address_entry_get_value (entry, "port");
574 family = dbus_address_entry_get_value (entry, "family");
576 *server_p = _dbus_server_new_for_tcp_socket (host, bind, port,
577 family, error, strcmp (method, "nonce-tcp") == 0 ? TRUE : FALSE);
581 _DBUS_ASSERT_ERROR_IS_CLEAR(error);
582 return DBUS_SERVER_LISTEN_OK;
586 _DBUS_ASSERT_ERROR_IS_SET(error);
587 return DBUS_SERVER_LISTEN_DID_NOT_CONNECT;
592 _DBUS_ASSERT_ERROR_IS_CLEAR(error);
593 return DBUS_SERVER_LISTEN_NOT_HANDLED;
598 * This is a bad hack since it's really unix domain socket
599 * specific. Also, the function weirdly adopts ownership
600 * of the passed-in string.
602 * @param server a socket server
603 * @param filename socket filename to report/delete
607 _dbus_server_socket_own_filename (DBusServer *server,
610 DBusServerSocket *socket_server = (DBusServerSocket*) server;
612 socket_server->socket_name = filename;