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
24 #include "dbus-internals.h"
25 #include "dbus-server-socket.h"
26 #include "dbus-transport-socket.h"
27 #include "dbus-connection-internal.h"
28 #include "dbus-memory.h"
29 #include "dbus-nonce.h"
30 #include "dbus-string.h"
33 * @defgroup DBusServerSocket DBusServer implementations for SOCKET
34 * @ingroup DBusInternals
35 * @brief Implementation details of DBusServer on SOCKET
41 * Opaque object representing a Socket server implementation.
43 typedef struct DBusServerSocket DBusServerSocket;
46 * Implementation details of DBusServerSocket. All members
49 struct DBusServerSocket
51 DBusServer base; /**< Parent class members. */
52 int n_fds; /**< Number of active file handles */
53 int *fds; /**< File descriptor or -1 if disconnected. */
54 DBusWatch **watch; /**< File descriptor watch. */
55 char *socket_name; /**< Name of domain socket, to unlink if appropriate */
56 DBusNonceFile *noncefile; /**< Nonce file used to authenticate clients */
60 socket_finalize (DBusServer *server)
62 DBusServerSocket *socket_server = (DBusServerSocket*) server;
65 _dbus_server_finalize_base (server);
67 for (i = 0 ; i < socket_server->n_fds ; i++)
68 if (socket_server->watch[i])
70 _dbus_watch_unref (socket_server->watch[i]);
71 socket_server->watch[i] = NULL;
74 dbus_free (socket_server->fds);
75 dbus_free (socket_server->watch);
76 dbus_free (socket_server->socket_name);
77 if (socket_server->noncefile)
78 _dbus_noncefile_delete (socket_server->noncefile, NULL);
79 dbus_free (socket_server->noncefile);
83 /* Return value is just for memory, not other failures. */
85 handle_new_client_fd_and_unlock (DBusServer *server,
88 DBusConnection *connection;
89 DBusTransport *transport;
90 DBusNewConnectionFunction new_connection_function;
91 DBusServerSocket* socket_server;
92 void *new_connection_data;
94 socket_server = (DBusServerSocket*)server;
95 _dbus_verbose ("Creating new client connection with fd %d\n", client_fd);
97 HAVE_LOCK_CHECK (server);
99 if (!_dbus_set_fd_nonblocking (client_fd, NULL))
101 SERVER_UNLOCK (server);
105 transport = _dbus_transport_new_for_socket (client_fd, &server->guid_hex, FALSE);
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)
189 listen_fd = dbus_watch_get_socket (watch);
191 client_fd = _dbus_accept_with_noncefile (listen_fd, socket_server->noncefile);
195 /* EINTR handled for us */
197 if (_dbus_get_is_errno_eagain_or_ewouldblock ())
198 _dbus_verbose ("No client available to accept after all\n");
200 _dbus_verbose ("Failed to accept a client connection: %s\n",
201 _dbus_strerror_from_errno ());
203 SERVER_UNLOCK (server);
207 if (!handle_new_client_fd_and_unlock (server, client_fd))
208 _dbus_verbose ("Rejected client connection due to lack of memory\n");
212 if (flags & DBUS_WATCH_ERROR)
213 _dbus_verbose ("Error on server listening socket\n");
215 if (flags & DBUS_WATCH_HANGUP)
216 _dbus_verbose ("Hangup on server listening socket\n");
222 socket_disconnect (DBusServer *server)
224 DBusServerSocket *socket_server = (DBusServerSocket*) server;
227 HAVE_LOCK_CHECK (server);
229 for (i = 0 ; i < socket_server->n_fds ; i++)
231 if (socket_server->watch[i])
233 _dbus_server_remove_watch (server,
234 socket_server->watch[i]);
235 _dbus_watch_unref (socket_server->watch[i]);
236 socket_server->watch[i] = NULL;
239 _dbus_close_socket (socket_server->fds[i], NULL);
240 socket_server->fds[i] = -1;
243 if (socket_server->socket_name != NULL)
246 _dbus_string_init_const (&tmp, socket_server->socket_name);
247 _dbus_delete_file (&tmp, NULL);
250 HAVE_LOCK_CHECK (server);
253 static const DBusServerVTable socket_vtable = {
259 * Creates a new server listening on the given file descriptor. The
260 * file descriptor should be nonblocking (use
261 * _dbus_set_fd_nonblocking() to make it so). The file descriptor
262 * should be listening for connections, that is, listen() should have
263 * been successfully invoked on it. The server will use accept() to
264 * accept new client connections.
266 * @param fds list of file descriptors.
267 * @param n_fds number of file descriptors
268 * @param address the server's address
269 * @param use_nonce whether to create and use a nonce for authentication
270 * @returns the new server, or #NULL if no memory.
274 _dbus_server_new_for_socket (int *fds,
276 const DBusString *address,
277 DBusNonceFile *noncefile)
279 DBusServerSocket *socket_server;
283 socket_server = dbus_new0 (DBusServerSocket, 1);
284 if (socket_server == NULL)
287 socket_server->noncefile = noncefile;
289 socket_server->fds = dbus_new (int, n_fds);
290 if (!socket_server->fds)
293 socket_server->watch = dbus_new0 (DBusWatch *, n_fds);
294 if (!socket_server->watch)
297 for (i = 0 ; i < n_fds ; i++)
301 watch = _dbus_watch_new (fds[i],
304 socket_handle_watch, socket_server,
309 socket_server->n_fds++;
310 socket_server->fds[i] = fds[i];
311 socket_server->watch[i] = watch;
314 if (!_dbus_server_init_base (&socket_server->base,
315 &socket_vtable, address))
318 server = (DBusServer*)socket_server;
320 SERVER_LOCK (server);
322 for (i = 0 ; i < n_fds ; i++)
324 if (!_dbus_server_add_watch (&socket_server->base,
325 socket_server->watch[i]))
328 for (j = 0 ; j < i ; j++)
329 _dbus_server_remove_watch (server,
330 socket_server->watch[j]);
332 SERVER_UNLOCK (server);
333 _dbus_server_finalize_base (&socket_server->base);
338 SERVER_UNLOCK (server);
340 return (DBusServer*) socket_server;
343 _dbus_noncefile_delete (socket_server->noncefile, NULL);
344 dbus_free (socket_server->noncefile );
346 for (i = 0 ; i < n_fds ; i++)
348 if (socket_server->watch[i] != NULL)
350 _dbus_watch_unref (socket_server->watch[i]);
351 socket_server->watch[i] = NULL;
354 dbus_free (socket_server->watch);
357 dbus_free (socket_server->fds);
360 dbus_free (socket_server);
365 * Creates a new server listening on TCP.
366 * If host is NULL, it will default to localhost.
367 * If bind is NULL, it will default to the value for the host
368 * parameter, and if that is NULL, then localhost
369 * If bind is a hostname, it will be resolved and will listen
370 * on all returned addresses.
371 * If family is NULL, hostname resolution will try all address
372 * families, otherwise it can be ipv4 or ipv6 to restrict the
373 * addresses considered.
375 * @param host the hostname to report for the listen address
376 * @param bind the hostname to listen on
377 * @param port the port to listen on or 0 to let the OS choose
379 * @param error location to store reason for failure.
380 * @param use_nonce whether to use a nonce for low-level authentication (nonce-tcp transport) or not (tcp transport)
381 * @returns the new server, or #NULL on failure.
384 _dbus_server_new_for_tcp_socket (const char *host,
389 dbus_bool_t use_nonce)
392 int *listen_fds = NULL;
393 int nlisten_fds = 0, i;
397 DBusNonceFile *noncefile;
399 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
403 if (!_dbus_string_init (&address))
405 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
409 if (!_dbus_string_init (&port_str))
411 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
423 else if (strcmp (bind, "*") == 0)
426 nlisten_fds =_dbus_listen_tcp_socket (bind, port, family,
429 if (nlisten_fds <= 0)
431 _DBUS_ASSERT_ERROR_IS_SET(error);
435 _dbus_string_init_const (&host_str, host);
436 if (!_dbus_string_append (&address, use_nonce ? "nonce-tcp:host=" : "tcp:host=") ||
437 !_dbus_address_append_escaped (&address, &host_str) ||
438 !_dbus_string_append (&address, ",port=") ||
439 !_dbus_string_append (&address, _dbus_string_get_const_data(&port_str)))
441 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
445 (!_dbus_string_append (&address, ",family=") ||
446 !_dbus_string_append (&address, family)))
448 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
454 noncefile = dbus_new0 (DBusNonceFile, 1);
455 if (noncefile == NULL)
460 if (!_dbus_noncefile_create (noncefile, NULL))
463 if (!_dbus_string_append (&address, ",noncefile=") ||
464 !_dbus_address_append_escaped (&address, _dbus_noncefile_get_path (noncefile)))
471 server = _dbus_server_new_for_socket (listen_fds, nlisten_fds, &address, noncefile);
474 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
478 _dbus_string_free (&port_str);
479 _dbus_string_free (&address);
480 dbus_free(listen_fds);
485 for (i = 0 ; i < nlisten_fds ; i++)
486 _dbus_close_socket (listen_fds[i], NULL);
487 dbus_free(listen_fds);
490 _dbus_string_free (&port_str);
493 _dbus_string_free (&address);
499 * Tries to interpret the address entry for various socket-related
500 * addresses (well, currently only tcp and nonce-tcp).
502 * Sets error if the result is not OK.
504 * @param entry an address entry
505 * @param server_p a new DBusServer, or #NULL on failure.
506 * @param error location to store rationale for failure on bad address
507 * @returns the outcome
510 DBusServerListenResult
511 _dbus_server_listen_socket (DBusAddressEntry *entry,
512 DBusServer **server_p,
519 method = dbus_address_entry_get_method (entry);
521 if (strcmp (method, "tcp") == 0 || strcmp (method, "nonce-tcp") == 0)
528 host = dbus_address_entry_get_value (entry, "host");
529 bind = dbus_address_entry_get_value (entry, "bind");
530 port = dbus_address_entry_get_value (entry, "port");
531 family = dbus_address_entry_get_value (entry, "family");
533 *server_p = _dbus_server_new_for_tcp_socket (host, bind, port,
534 family, error, strcmp (method, "nonce-tcp") == 0 ? TRUE : FALSE);
538 _DBUS_ASSERT_ERROR_IS_CLEAR(error);
539 return DBUS_SERVER_LISTEN_OK;
543 _DBUS_ASSERT_ERROR_IS_SET(error);
544 return DBUS_SERVER_LISTEN_DID_NOT_CONNECT;
549 _DBUS_ASSERT_ERROR_IS_CLEAR(error);
550 return DBUS_SERVER_LISTEN_NOT_HANDLED;
555 * This is a bad hack since it's really unix domain socket
556 * specific. Also, the function weirdly adopts ownership
557 * of the passed-in string.
559 * @param server a socket server
560 * @param filename socket filename to report/delete
564 _dbus_server_socket_own_filename (DBusServer *server,
567 DBusServerSocket *socket_server = (DBusServerSocket*) server;
569 socket_server->socket_name = filename;