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dbus-server-unix.c

00001 /* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
00002 /* dbus-server-unix.c Server implementation for Unix network protocols.
00003  *
00004  * Copyright (C) 2002, 2003, 2004  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-unix.h"
00027 #include "dbus-server-socket.h"
00028 #include "dbus-transport-unix.h"
00029 #include "dbus-connection-internal.h"
00030 #include "dbus-sysdeps-unix.h"
00031 #include "dbus-string.h"
00032 
00052 DBusServerListenResult
00053 _dbus_server_listen_platform_specific (DBusAddressEntry *entry,
00054                                        DBusServer      **server_p,
00055                                        DBusError        *error)
00056 {
00057   const char *method;
00058 
00059   *server_p = NULL;
00060 
00061   method = dbus_address_entry_get_method (entry);
00062 
00063   if (strcmp (method, "unix") == 0)
00064     {
00065       const char *path = dbus_address_entry_get_value (entry, "path");
00066       const char *tmpdir = dbus_address_entry_get_value (entry, "tmpdir");
00067       const char *abstract = dbus_address_entry_get_value (entry, "abstract");
00068 
00069       if (path == NULL && tmpdir == NULL && abstract == NULL)
00070         {
00071           _dbus_set_bad_address(error, "unix",
00072                                 "path or tmpdir or abstract",
00073                                 NULL);
00074           return DBUS_SERVER_LISTEN_BAD_ADDRESS;
00075         }
00076 
00077       if ((path && tmpdir) ||
00078           (path && abstract) ||
00079           (tmpdir && abstract))
00080         {
00081           _dbus_set_bad_address(error, NULL, NULL,
00082                                 "cannot specify two of \"path\" and \"tmpdir\" and \"abstract\" at the same time");
00083           return DBUS_SERVER_LISTEN_BAD_ADDRESS;
00084         }
00085 
00086       if (tmpdir != NULL)
00087         {
00088           DBusString full_path;
00089           DBusString filename;
00090 
00091           if (!_dbus_string_init (&full_path))
00092             {
00093               dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
00094               return DBUS_SERVER_LISTEN_DID_NOT_CONNECT;
00095             }
00096 
00097           if (!_dbus_string_init (&filename))
00098             {
00099               _dbus_string_free (&full_path);
00100               dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
00101               return DBUS_SERVER_LISTEN_DID_NOT_CONNECT;
00102             }
00103 
00104           if (!_dbus_string_append (&filename,
00105                                     "dbus-") ||
00106               !_dbus_generate_random_ascii (&filename, 10) ||
00107               !_dbus_string_append (&full_path, tmpdir) ||
00108               !_dbus_concat_dir_and_file (&full_path, &filename))
00109             {
00110               _dbus_string_free (&full_path);
00111               _dbus_string_free (&filename);
00112               dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
00113               return DBUS_SERVER_LISTEN_DID_NOT_CONNECT;
00114             }
00115 
00116           /* Always use abstract namespace if possible with tmpdir */
00117 
00118           *server_p =
00119             _dbus_server_new_for_domain_socket (_dbus_string_get_const_data (&full_path),
00120 #ifdef HAVE_ABSTRACT_SOCKETS
00121                                                 TRUE,
00122 #else
00123                                                 FALSE,
00124 #endif
00125                                                 error);
00126 
00127           _dbus_string_free (&full_path);
00128           _dbus_string_free (&filename);
00129         }
00130       else
00131         {
00132           if (path)
00133             *server_p = _dbus_server_new_for_domain_socket (path, FALSE, error);
00134           else
00135             *server_p = _dbus_server_new_for_domain_socket (abstract, TRUE, error);
00136         }
00137 
00138       if (*server_p != NULL)
00139         {
00140           _DBUS_ASSERT_ERROR_IS_CLEAR(error);
00141           return DBUS_SERVER_LISTEN_OK;
00142         }
00143       else
00144         {
00145           _DBUS_ASSERT_ERROR_IS_SET(error);
00146           return DBUS_SERVER_LISTEN_DID_NOT_CONNECT;
00147         }
00148     }
00149   else if (strcmp (method, "systemd") == 0)
00150     {
00151       int n, *fds;
00152       DBusString address;
00153 
00154       n = _dbus_listen_systemd_sockets (&fds, error);
00155       if (n < 0)
00156         {
00157           _DBUS_ASSERT_ERROR_IS_SET (error);
00158           return DBUS_SERVER_LISTEN_DID_NOT_CONNECT;
00159         }
00160 
00161       _dbus_string_init_const (&address, "systemd:");
00162 
00163       *server_p = _dbus_server_new_for_socket (fds, n, &address, NULL);
00164       if (*server_p == NULL)
00165         {
00166           int i;
00167 
00168           for (i = 0; i < n; i++)
00169             {
00170               _dbus_close_socket (fds[i], NULL);
00171             }
00172           dbus_free (fds);
00173 
00174           dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
00175           return DBUS_SERVER_LISTEN_DID_NOT_CONNECT;
00176         }
00177 
00178       dbus_free (fds);
00179 
00180       return DBUS_SERVER_LISTEN_OK;
00181     }
00182   else
00183     {
00184       /* If we don't handle the method, we return NULL with the
00185        * error unset
00186        */
00187       _DBUS_ASSERT_ERROR_IS_CLEAR(error);
00188       return DBUS_SERVER_LISTEN_NOT_HANDLED;
00189     }
00190 }
00191 
00200 DBusServer*
00201 _dbus_server_new_for_domain_socket (const char     *path,
00202                                     dbus_bool_t     abstract,
00203                                     DBusError      *error)
00204 {
00205   DBusServer *server;
00206   int listen_fd;
00207   DBusString address;
00208   char *path_copy;
00209   DBusString path_str;
00210 
00211   _DBUS_ASSERT_ERROR_IS_CLEAR (error);
00212 
00213   if (!_dbus_string_init (&address))
00214     {
00215       dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
00216       return NULL;
00217     }
00218 
00219   _dbus_string_init_const (&path_str, path);
00220   if ((abstract &&
00221        !_dbus_string_append (&address, "unix:abstract=")) ||
00222       (!abstract &&
00223        !_dbus_string_append (&address, "unix:path=")) ||
00224       !_dbus_address_append_escaped (&address, &path_str))
00225     {
00226       dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
00227       goto failed_0;
00228     }
00229 
00230   path_copy = _dbus_strdup (path);
00231   if (path_copy == NULL)
00232     {
00233       dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
00234       goto failed_0;
00235     }
00236 
00237   listen_fd = _dbus_listen_unix_socket (path, abstract, error);
00238 
00239   if (listen_fd < 0)
00240     {
00241       _DBUS_ASSERT_ERROR_IS_SET (error);
00242       goto failed_1;
00243     }
00244 
00245   server = _dbus_server_new_for_socket (&listen_fd, 1, &address, 0);
00246   if (server == NULL)
00247     {
00248       dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
00249       goto failed_2;
00250     }
00251 
00252   _dbus_server_socket_own_filename(server, path_copy);
00253 
00254   _dbus_string_free (&address);
00255 
00256   return server;
00257 
00258  failed_2:
00259   _dbus_close_socket (listen_fd, NULL);
00260  failed_1:
00261   dbus_free (path_copy);
00262  failed_0:
00263   _dbus_string_free (&address);
00264 
00265   return NULL;
00266 }
00267 

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