D-Bus 1.4.0
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00001 /* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */ 00002 /* dbus-server-socket.c Server implementation for sockets 00003 * 00004 * Copyright (C) 2002, 2003, 2004, 2006 Red Hat Inc. 00005 * 00006 * Licensed under the Academic Free License version 2.1 00007 * 00008 * This program is free software; you can redistribute it and/or modify 00009 * it under the terms of the GNU General Public License as published by 00010 * the Free Software Foundation; either version 2 of the License, or 00011 * (at your option) any later version. 00012 * 00013 * This program is distributed in the hope that it will be useful, 00014 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00015 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00016 * GNU General Public License for more details. 00017 * 00018 * You should have received a copy of the GNU General Public License 00019 * along with this program; if not, write to the Free Software 00020 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00021 * 00022 */ 00023 00024 #include <config.h> 00025 #include "dbus-internals.h" 00026 #include "dbus-server-socket.h" 00027 #include "dbus-transport-socket.h" 00028 #include "dbus-connection-internal.h" 00029 #include "dbus-memory.h" 00030 #include "dbus-nonce.h" 00031 #include "dbus-string.h" 00032 00044 typedef struct DBusServerSocket DBusServerSocket; 00045 00050 struct DBusServerSocket 00051 { 00052 DBusServer base; 00053 int n_fds; 00054 int *fds; 00055 DBusWatch **watch; 00056 char *socket_name; 00057 DBusNonceFile *noncefile; 00058 }; 00059 00060 static void 00061 socket_finalize (DBusServer *server) 00062 { 00063 DBusServerSocket *socket_server = (DBusServerSocket*) server; 00064 int i; 00065 00066 _dbus_server_finalize_base (server); 00067 00068 for (i = 0 ; i < socket_server->n_fds ; i++) 00069 if (socket_server->watch[i]) 00070 { 00071 _dbus_watch_unref (socket_server->watch[i]); 00072 socket_server->watch[i] = NULL; 00073 } 00074 00075 dbus_free (socket_server->fds); 00076 dbus_free (socket_server->watch); 00077 dbus_free (socket_server->socket_name); 00078 if (socket_server->noncefile) 00079 _dbus_noncefile_delete (socket_server->noncefile, NULL); 00080 dbus_free (socket_server->noncefile); 00081 dbus_free (server); 00082 } 00083 00084 /* Return value is just for memory, not other failures. */ 00085 static dbus_bool_t 00086 handle_new_client_fd_and_unlock (DBusServer *server, 00087 int client_fd) 00088 { 00089 DBusConnection *connection; 00090 DBusTransport *transport; 00091 DBusNewConnectionFunction new_connection_function; 00092 DBusServerSocket* socket_server; 00093 void *new_connection_data; 00094 00095 socket_server = (DBusServerSocket*)server; 00096 _dbus_verbose ("Creating new client connection with fd %d\n", client_fd); 00097 00098 HAVE_LOCK_CHECK (server); 00099 00100 if (!_dbus_set_fd_nonblocking (client_fd, NULL)) 00101 { 00102 SERVER_UNLOCK (server); 00103 return TRUE; 00104 } 00105 00106 transport = _dbus_transport_new_for_socket (client_fd, &server->guid_hex, FALSE); 00107 if (transport == NULL) 00108 { 00109 _dbus_close_socket (client_fd, NULL); 00110 SERVER_UNLOCK (server); 00111 return FALSE; 00112 } 00113 00114 if (!_dbus_transport_set_auth_mechanisms (transport, 00115 (const char **) server->auth_mechanisms)) 00116 { 00117 _dbus_transport_unref (transport); 00118 SERVER_UNLOCK (server); 00119 return FALSE; 00120 } 00121 00122 /* note that client_fd is now owned by the transport, and will be 00123 * closed on transport disconnection/finalization 00124 */ 00125 00126 connection = _dbus_connection_new_for_transport (transport); 00127 _dbus_transport_unref (transport); 00128 transport = NULL; /* now under the connection lock */ 00129 00130 if (connection == NULL) 00131 { 00132 SERVER_UNLOCK (server); 00133 return FALSE; 00134 } 00135 00136 /* See if someone wants to handle this new connection, self-referencing 00137 * for paranoia. 00138 */ 00139 new_connection_function = server->new_connection_function; 00140 new_connection_data = server->new_connection_data; 00141 00142 _dbus_server_ref_unlocked (server); 00143 SERVER_UNLOCK (server); 00144 00145 if (new_connection_function) 00146 { 00147 (* new_connection_function) (server, connection, 00148 new_connection_data); 00149 } 00150 dbus_server_unref (server); 00151 00152 /* If no one grabbed a reference, the connection will die. */ 00153 _dbus_connection_close_if_only_one_ref (connection); 00154 dbus_connection_unref (connection); 00155 00156 return TRUE; 00157 } 00158 00159 static dbus_bool_t 00160 socket_handle_watch (DBusWatch *watch, 00161 unsigned int flags, 00162 void *data) 00163 { 00164 DBusServer *server = data; 00165 DBusServerSocket *socket_server = data; 00166 00167 #ifndef DBUS_DISABLE_ASSERT 00168 int i; 00169 dbus_bool_t found = FALSE; 00170 #endif 00171 00172 SERVER_LOCK (server); 00173 00174 #ifndef DBUS_DISABLE_ASSERT 00175 for (i = 0 ; i < socket_server->n_fds ; i++) 00176 { 00177 if (socket_server->watch[i] == watch) 00178 found = TRUE; 00179 } 00180 _dbus_assert (found); 00181 #endif 00182 00183 _dbus_verbose ("Handling client connection, flags 0x%x\n", flags); 00184 00185 if (flags & DBUS_WATCH_READABLE) 00186 { 00187 int client_fd; 00188 int listen_fd; 00189 00190 listen_fd = dbus_watch_get_socket (watch); 00191 00192 if (socket_server->noncefile) 00193 client_fd = _dbus_accept_with_noncefile (listen_fd, socket_server->noncefile); 00194 else 00195 client_fd = _dbus_accept (listen_fd); 00196 00197 if (client_fd < 0) 00198 { 00199 /* EINTR handled for us */ 00200 00201 if (_dbus_get_is_errno_eagain_or_ewouldblock ()) 00202 _dbus_verbose ("No client available to accept after all\n"); 00203 else 00204 _dbus_verbose ("Failed to accept a client connection: %s\n", 00205 _dbus_strerror_from_errno ()); 00206 00207 SERVER_UNLOCK (server); 00208 } 00209 else 00210 { 00211 if (!handle_new_client_fd_and_unlock (server, client_fd)) 00212 _dbus_verbose ("Rejected client connection due to lack of memory\n"); 00213 } 00214 } 00215 00216 if (flags & DBUS_WATCH_ERROR) 00217 _dbus_verbose ("Error on server listening socket\n"); 00218 00219 if (flags & DBUS_WATCH_HANGUP) 00220 _dbus_verbose ("Hangup on server listening socket\n"); 00221 00222 return TRUE; 00223 } 00224 00225 static void 00226 socket_disconnect (DBusServer *server) 00227 { 00228 DBusServerSocket *socket_server = (DBusServerSocket*) server; 00229 int i; 00230 00231 HAVE_LOCK_CHECK (server); 00232 00233 for (i = 0 ; i < socket_server->n_fds ; i++) 00234 { 00235 if (socket_server->watch[i]) 00236 { 00237 _dbus_server_remove_watch (server, 00238 socket_server->watch[i]); 00239 _dbus_watch_unref (socket_server->watch[i]); 00240 socket_server->watch[i] = NULL; 00241 } 00242 00243 _dbus_close_socket (socket_server->fds[i], NULL); 00244 socket_server->fds[i] = -1; 00245 } 00246 00247 if (socket_server->socket_name != NULL) 00248 { 00249 DBusString tmp; 00250 _dbus_string_init_const (&tmp, socket_server->socket_name); 00251 _dbus_delete_file (&tmp, NULL); 00252 } 00253 00254 HAVE_LOCK_CHECK (server); 00255 } 00256 00257 static const DBusServerVTable socket_vtable = { 00258 socket_finalize, 00259 socket_disconnect 00260 }; 00261 00277 DBusServer* 00278 _dbus_server_new_for_socket (int *fds, 00279 int n_fds, 00280 const DBusString *address, 00281 DBusNonceFile *noncefile) 00282 { 00283 DBusServerSocket *socket_server; 00284 DBusServer *server; 00285 int i; 00286 00287 socket_server = dbus_new0 (DBusServerSocket, 1); 00288 if (socket_server == NULL) 00289 return NULL; 00290 00291 socket_server->noncefile = noncefile; 00292 00293 socket_server->fds = dbus_new (int, n_fds); 00294 if (!socket_server->fds) 00295 goto failed_0; 00296 00297 socket_server->watch = dbus_new0 (DBusWatch *, n_fds); 00298 if (!socket_server->watch) 00299 goto failed_1; 00300 00301 for (i = 0 ; i < n_fds ; i++) 00302 { 00303 DBusWatch *watch; 00304 00305 watch = _dbus_watch_new (fds[i], 00306 DBUS_WATCH_READABLE, 00307 TRUE, 00308 socket_handle_watch, socket_server, 00309 NULL); 00310 if (watch == NULL) 00311 goto failed_2; 00312 00313 socket_server->n_fds++; 00314 socket_server->fds[i] = fds[i]; 00315 socket_server->watch[i] = watch; 00316 } 00317 00318 if (!_dbus_server_init_base (&socket_server->base, 00319 &socket_vtable, address)) 00320 goto failed_2; 00321 00322 server = (DBusServer*)socket_server; 00323 00324 SERVER_LOCK (server); 00325 00326 for (i = 0 ; i < n_fds ; i++) 00327 { 00328 if (!_dbus_server_add_watch (&socket_server->base, 00329 socket_server->watch[i])) 00330 { 00331 int j; 00332 for (j = 0 ; j < i ; j++) 00333 _dbus_server_remove_watch (server, 00334 socket_server->watch[j]); 00335 00336 SERVER_UNLOCK (server); 00337 _dbus_server_finalize_base (&socket_server->base); 00338 goto failed_2; 00339 } 00340 } 00341 00342 SERVER_UNLOCK (server); 00343 00344 return (DBusServer*) socket_server; 00345 00346 failed_3: 00347 if (socket_server->noncefile) 00348 { 00349 _dbus_noncefile_delete (socket_server->noncefile, NULL); 00350 dbus_free (socket_server->noncefile ); 00351 } 00352 failed_2: 00353 for (i = 0 ; i < n_fds ; i++) 00354 { 00355 if (socket_server->watch[i] != NULL) 00356 { 00357 _dbus_watch_unref (socket_server->watch[i]); 00358 socket_server->watch[i] = NULL; 00359 } 00360 } 00361 dbus_free (socket_server->watch); 00362 00363 failed_1: 00364 dbus_free (socket_server->fds); 00365 00366 failed_0: 00367 dbus_free (socket_server); 00368 return NULL; 00369 } 00370 00390 DBusServer* 00391 _dbus_server_new_for_tcp_socket (const char *host, 00392 const char *bind, 00393 const char *port, 00394 const char *family, 00395 DBusError *error, 00396 dbus_bool_t use_nonce) 00397 { 00398 DBusServer *server; 00399 int *listen_fds = NULL; 00400 int nlisten_fds = 0, i; 00401 DBusString address; 00402 DBusString host_str; 00403 DBusString port_str; 00404 DBusNonceFile *noncefile; 00405 00406 _DBUS_ASSERT_ERROR_IS_CLEAR (error); 00407 00408 noncefile = NULL; 00409 00410 if (!_dbus_string_init (&address)) 00411 { 00412 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL); 00413 return NULL; 00414 } 00415 00416 if (!_dbus_string_init (&port_str)) 00417 { 00418 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL); 00419 goto failed_0; 00420 } 00421 00422 if (host == NULL) 00423 host = "localhost"; 00424 00425 if (port == NULL) 00426 port = "0"; 00427 00428 if (bind == NULL) 00429 bind = host; 00430 else if (strcmp (bind, "*") == 0) 00431 bind = NULL; 00432 00433 nlisten_fds =_dbus_listen_tcp_socket (bind, port, family, 00434 &port_str, 00435 &listen_fds, error); 00436 if (nlisten_fds <= 0) 00437 { 00438 _DBUS_ASSERT_ERROR_IS_SET(error); 00439 goto failed_1; 00440 } 00441 00442 _dbus_string_init_const (&host_str, host); 00443 if (!_dbus_string_append (&address, use_nonce ? "nonce-tcp:host=" : "tcp:host=") || 00444 !_dbus_address_append_escaped (&address, &host_str) || 00445 !_dbus_string_append (&address, ",port=") || 00446 !_dbus_string_append (&address, _dbus_string_get_const_data(&port_str))) 00447 { 00448 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL); 00449 goto failed_2; 00450 } 00451 if (family && 00452 (!_dbus_string_append (&address, ",family=") || 00453 !_dbus_string_append (&address, family))) 00454 { 00455 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL); 00456 goto failed_2; 00457 } 00458 00459 if (use_nonce) 00460 { 00461 noncefile = dbus_new0 (DBusNonceFile, 1); 00462 if (noncefile == NULL) 00463 { 00464 goto failed_2; 00465 } 00466 00467 if (!_dbus_noncefile_create (noncefile, NULL)) 00468 goto failed_2; 00469 00470 if (!_dbus_string_append (&address, ",noncefile=") || 00471 !_dbus_address_append_escaped (&address, _dbus_noncefile_get_path (noncefile))) 00472 { 00473 goto failed_2; 00474 } 00475 00476 } 00477 00478 server = _dbus_server_new_for_socket (listen_fds, nlisten_fds, &address, noncefile); 00479 if (server == NULL) 00480 { 00481 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL); 00482 goto failed_2; 00483 } 00484 00485 _dbus_string_free (&port_str); 00486 _dbus_string_free (&address); 00487 dbus_free(listen_fds); 00488 00489 return server; 00490 00491 failed_2: 00492 for (i = 0 ; i < nlisten_fds ; i++) 00493 _dbus_close_socket (listen_fds[i], NULL); 00494 dbus_free(listen_fds); 00495 00496 failed_1: 00497 _dbus_string_free (&port_str); 00498 00499 failed_0: 00500 _dbus_string_free (&address); 00501 00502 return NULL; 00503 } 00504 00517 DBusServerListenResult 00518 _dbus_server_listen_socket (DBusAddressEntry *entry, 00519 DBusServer **server_p, 00520 DBusError *error) 00521 { 00522 const char *method; 00523 00524 *server_p = NULL; 00525 00526 method = dbus_address_entry_get_method (entry); 00527 00528 if (strcmp (method, "tcp") == 0 || strcmp (method, "nonce-tcp") == 0) 00529 { 00530 const char *host; 00531 const char *port; 00532 const char *bind; 00533 const char *family; 00534 00535 host = dbus_address_entry_get_value (entry, "host"); 00536 bind = dbus_address_entry_get_value (entry, "bind"); 00537 port = dbus_address_entry_get_value (entry, "port"); 00538 family = dbus_address_entry_get_value (entry, "family"); 00539 00540 *server_p = _dbus_server_new_for_tcp_socket (host, bind, port, 00541 family, error, strcmp (method, "nonce-tcp") == 0 ? TRUE : FALSE); 00542 00543 if (*server_p) 00544 { 00545 _DBUS_ASSERT_ERROR_IS_CLEAR(error); 00546 return DBUS_SERVER_LISTEN_OK; 00547 } 00548 else 00549 { 00550 _DBUS_ASSERT_ERROR_IS_SET(error); 00551 return DBUS_SERVER_LISTEN_DID_NOT_CONNECT; 00552 } 00553 } 00554 else 00555 { 00556 _DBUS_ASSERT_ERROR_IS_CLEAR(error); 00557 return DBUS_SERVER_LISTEN_NOT_HANDLED; 00558 } 00559 } 00560 00570 void 00571 _dbus_server_socket_own_filename (DBusServer *server, 00572 char *filename) 00573 { 00574 DBusServerSocket *socket_server = (DBusServerSocket*) server; 00575 00576 socket_server->socket_name = filename; 00577 } 00578 00579