dbus-server-socket.c

00001 /* -*- mode: C; c-file-style: "gnu" -*- */
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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
00021  *
00022  */
00023 
00024 #include "dbus-internals.h"
00025 #include "dbus-server-socket.h"
00026 #include "dbus-transport-socket.h"
00027 #include "dbus-connection-internal.h"
00028 #include "dbus-string.h"
00029 
00041 typedef struct DBusServerSocket DBusServerSocket;
00042 
00047 struct DBusServerSocket
00048 {
00049   DBusServer base;   
00050   int fd;            
00051   DBusWatch *watch;  
00052   char *socket_name; 
00053 };
00054 
00055 static void
00056 socket_finalize (DBusServer *server)
00057 {
00058   DBusServerSocket *socket_server = (DBusServerSocket*) server;
00059   
00060   _dbus_server_finalize_base (server);
00061 
00062   if (socket_server->watch)
00063     {
00064       _dbus_watch_unref (socket_server->watch);
00065       socket_server->watch = NULL;
00066     }
00067   
00068   dbus_free (socket_server->socket_name);
00069   dbus_free (server);
00070 }
00071 
00072 /* Return value is just for memory, not other failures. */
00073 static dbus_bool_t
00074 handle_new_client_fd_and_unlock (DBusServer *server,
00075                                  int         client_fd)
00076 {
00077   DBusConnection *connection;
00078   DBusTransport *transport;
00079   DBusNewConnectionFunction new_connection_function;
00080   void *new_connection_data;
00081   
00082   _dbus_verbose ("Creating new client connection with fd %d\n", client_fd);
00083 
00084   HAVE_LOCK_CHECK (server);
00085   
00086   if (!_dbus_set_fd_nonblocking (client_fd, NULL))
00087     {
00088       SERVER_UNLOCK (server);
00089       return TRUE;
00090     }
00091   
00092   transport = _dbus_transport_new_for_socket (client_fd, &server->guid_hex, NULL);
00093   if (transport == NULL)
00094     {
00095       _dbus_close_socket (client_fd, NULL);
00096       SERVER_UNLOCK (server);
00097       return FALSE;
00098     }
00099 
00100   if (!_dbus_transport_set_auth_mechanisms (transport,
00101                                             (const char **) server->auth_mechanisms))
00102     {
00103       _dbus_transport_unref (transport);
00104       SERVER_UNLOCK (server);
00105       return FALSE;
00106     }
00107   
00108   /* note that client_fd is now owned by the transport, and will be
00109    * closed on transport disconnection/finalization
00110    */
00111   
00112   connection = _dbus_connection_new_for_transport (transport);
00113   _dbus_transport_unref (transport);
00114   transport = NULL; /* now under the connection lock */
00115   
00116   if (connection == NULL)
00117     {
00118       SERVER_UNLOCK (server);
00119       return FALSE;
00120     }
00121   
00122   /* See if someone wants to handle this new connection, self-referencing
00123    * for paranoia.
00124    */
00125   new_connection_function = server->new_connection_function;
00126   new_connection_data = server->new_connection_data;
00127 
00128   _dbus_server_ref_unlocked (server);
00129   SERVER_UNLOCK (server);
00130   
00131   if (new_connection_function)
00132     {
00133       (* new_connection_function) (server, connection,
00134                                    new_connection_data);
00135     }
00136   dbus_server_unref (server);
00137   
00138   /* If no one grabbed a reference, the connection will die. */
00139   _dbus_connection_close_if_only_one_ref (connection);
00140   dbus_connection_unref (connection);
00141 
00142   return TRUE;
00143 }
00144 
00145 static dbus_bool_t
00146 socket_handle_watch (DBusWatch    *watch,
00147                    unsigned int  flags,
00148                    void         *data)
00149 {
00150   DBusServer *server = data;
00151   DBusServerSocket *socket_server = data;
00152 
00153   SERVER_LOCK (server);
00154   
00155   _dbus_assert (watch == socket_server->watch);
00156 
00157   _dbus_verbose ("Handling client connection, flags 0x%x\n", flags);
00158   
00159   if (flags & DBUS_WATCH_READABLE)
00160     {
00161       int client_fd;
00162       int listen_fd;
00163       
00164       listen_fd = dbus_watch_get_fd (watch);
00165 
00166       client_fd = _dbus_accept (listen_fd);
00167       
00168       if (client_fd < 0)
00169         {
00170           /* EINTR handled for us */
00171           
00172           if (errno == EAGAIN || errno == EWOULDBLOCK)
00173             _dbus_verbose ("No client available to accept after all\n");
00174           else
00175             _dbus_verbose ("Failed to accept a client connection: %s\n",
00176                            _dbus_strerror (errno));
00177 
00178           SERVER_UNLOCK (server);
00179         }
00180       else
00181         {
00182           _dbus_fd_set_close_on_exec (client_fd);         
00183 
00184           if (!handle_new_client_fd_and_unlock (server, client_fd))
00185             _dbus_verbose ("Rejected client connection due to lack of memory\n");
00186         }
00187     }
00188 
00189   if (flags & DBUS_WATCH_ERROR)
00190     _dbus_verbose ("Error on server listening socket\n");
00191 
00192   if (flags & DBUS_WATCH_HANGUP)
00193     _dbus_verbose ("Hangup on server listening socket\n");
00194 
00195   return TRUE;
00196 }
00197   
00198 static void
00199 socket_disconnect (DBusServer *server)
00200 {
00201   DBusServerSocket *socket_server = (DBusServerSocket*) server;
00202 
00203   HAVE_LOCK_CHECK (server);
00204   
00205   if (socket_server->watch)
00206     {
00207       _dbus_server_remove_watch (server,
00208                                  socket_server->watch);
00209       _dbus_watch_unref (socket_server->watch);
00210       socket_server->watch = NULL;
00211     }
00212   
00213   _dbus_close_socket (socket_server->fd, NULL);
00214   socket_server->fd = -1;
00215 
00216   if (socket_server->socket_name != NULL)
00217     {
00218       DBusString tmp;
00219       _dbus_string_init_const (&tmp, socket_server->socket_name);
00220       _dbus_delete_file (&tmp, NULL);
00221     }
00222 
00223   HAVE_LOCK_CHECK (server);
00224 }
00225 
00226 static const DBusServerVTable socket_vtable = {
00227   socket_finalize,
00228   socket_disconnect
00229 };
00230 
00244 DBusServer*
00245 _dbus_server_new_for_socket (int               fd,
00246                              const DBusString *address)
00247 {
00248   DBusServerSocket *socket_server;
00249   DBusServer *server;
00250   DBusWatch *watch;
00251   
00252   socket_server = dbus_new0 (DBusServerSocket, 1);
00253   if (socket_server == NULL)
00254     return NULL;
00255   
00256   watch = _dbus_watch_new (fd,
00257                            DBUS_WATCH_READABLE,
00258                            TRUE,
00259                            socket_handle_watch, socket_server,
00260                            NULL);
00261   if (watch == NULL)
00262     {
00263       dbus_free (socket_server);
00264       return NULL;
00265     }
00266   
00267   if (!_dbus_server_init_base (&socket_server->base,
00268                                &socket_vtable, address))
00269     {
00270       _dbus_watch_unref (watch);
00271       dbus_free (socket_server);
00272       return NULL;
00273     }
00274 
00275   server = (DBusServer*) socket_server;
00276 
00277   SERVER_LOCK (server);
00278   
00279   if (!_dbus_server_add_watch (&socket_server->base,
00280                                watch))
00281     {
00282       SERVER_UNLOCK (server);
00283       _dbus_server_finalize_base (&socket_server->base);
00284       _dbus_watch_unref (watch);
00285       dbus_free (socket_server);
00286       return NULL;
00287     }
00288   
00289   socket_server->fd = fd;
00290   socket_server->watch = watch;
00291 
00292   SERVER_UNLOCK (server);
00293   
00294   return (DBusServer*) socket_server;
00295 }
00296 
00306 DBusServer*
00307 _dbus_server_new_for_tcp_socket (const char     *host,
00308                                  dbus_uint32_t   port,
00309                                  DBusError      *error)
00310 {
00311   DBusServer *server;
00312   int listen_fd;
00313   DBusString address;
00314   DBusString host_str;
00315   
00316   _DBUS_ASSERT_ERROR_IS_CLEAR (error);
00317 
00318   if (!_dbus_string_init (&address))
00319     {
00320       dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
00321       return NULL;
00322     }
00323 
00324   if (host == NULL)
00325     host = "localhost";
00326 
00327   _dbus_string_init_const (&host_str, host);
00328   if (!_dbus_string_append (&address, "tcp:host=") ||
00329       !_dbus_address_append_escaped (&address, &host_str) ||
00330       !_dbus_string_append (&address, ",port=") ||
00331       !_dbus_string_append_int (&address, port))
00332     {
00333       _dbus_string_free (&address);
00334       dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
00335       return NULL;
00336     }
00337   
00338   listen_fd = _dbus_listen_tcp_socket (host, port, error);
00339   _dbus_fd_set_close_on_exec (listen_fd);
00340   
00341   if (listen_fd < 0)
00342     {
00343       _dbus_string_free (&address);
00344       return NULL;
00345     }
00346   
00347   server = _dbus_server_new_for_socket (listen_fd, &address);
00348   if (server == NULL)
00349     {
00350       dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
00351       _dbus_close_socket (listen_fd, NULL);
00352       _dbus_string_free (&address);
00353       return NULL;
00354     }
00355 
00356   _dbus_string_free (&address);
00357   
00358   return server;
00359 
00360 
00361 }
00362 
00375 DBusServerListenResult
00376 _dbus_server_listen_socket (DBusAddressEntry *entry,
00377                             DBusServer      **server_p,
00378                             DBusError        *error)
00379 {
00380   const char *method;
00381 
00382   *server_p = NULL;
00383   
00384   method = dbus_address_entry_get_method (entry);
00385   
00386   if (strcmp (method, "tcp") == 0)
00387     {
00388       const char *host = dbus_address_entry_get_value (entry, "host");
00389       const char *port = dbus_address_entry_get_value (entry, "port");
00390       DBusString  str;
00391       long lport;
00392       dbus_bool_t sresult;
00393           
00394       if (port == NULL)
00395         {
00396           _dbus_set_bad_address(error, "tcp", "port", NULL);
00397           return DBUS_SERVER_LISTEN_BAD_ADDRESS;
00398         }
00399 
00400       _dbus_string_init_const (&str, port);
00401       sresult = _dbus_string_parse_int (&str, 0, &lport, NULL);
00402       _dbus_string_free (&str);
00403           
00404       if (sresult == FALSE || lport <= 0 || lport > 65535)
00405         {
00406           _dbus_set_bad_address(error, NULL, NULL, 
00407                                 "Port is not an integer between 0 and 65535");
00408           return DBUS_SERVER_LISTEN_BAD_ADDRESS;
00409         }
00410           
00411       *server_p = _dbus_server_new_for_tcp_socket (host, lport, error);
00412 
00413       if (*server_p)
00414         {
00415           _DBUS_ASSERT_ERROR_IS_CLEAR(error);
00416           return DBUS_SERVER_LISTEN_OK;
00417         }
00418       else
00419         {
00420           _DBUS_ASSERT_ERROR_IS_SET(error);
00421           return DBUS_SERVER_LISTEN_DID_NOT_CONNECT;
00422         }
00423     }
00424   else
00425     {
00426       _DBUS_ASSERT_ERROR_IS_CLEAR(error);
00427       return DBUS_SERVER_LISTEN_NOT_HANDLED;
00428     }
00429 }
00430 
00440 void
00441 _dbus_server_socket_own_filename (DBusServer *server,
00442                                   char       *filename)
00443 {
00444   DBusServerSocket *socket_server = (DBusServerSocket*) server;
00445 
00446   socket_server->socket_name = filename;
00447 }
00448 
00449 

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