summaryrefslogtreecommitdiffstats
path: root/dbus/dbus-server-unix.c
blob: fba9e9d25a9e911abaa8fc17a066a46797f75c3f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
/* dbus-server-unix.c Server implementation for Unix network protocols.
 *
 * Copyright (C) 2002, 2003, 2004  Red Hat Inc.
 *
 * Licensed under the Academic Free License version 2.1
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 */

#include "dbus-internals.h"
#include "dbus-server-unix.h"
#include "dbus-server-socket.h"
#include "dbus-transport-unix.h"
#include "dbus-connection-internal.h"
#include "dbus-sysdeps-unix.h"
#include "dbus-string.h"

/**
 * @defgroup DBusServerUnix DBusServer implementations for UNIX
 * @ingroup  DBusInternals
 * @brief Implementation details of DBusServer on UNIX
 *
 * @{
 */

/**
 * Tries to interpret the address entry in a platform-specific
 * way, creating a platform-specific server type if appropriate.
 * Sets error if the result is not OK.
 * 
 * @param entry an address entry
 * @param server_p location to store a new DBusServer, or #NULL on failure.
 * @param error location to store rationale for failure on bad address
 * @returns the outcome
 * 
 */
DBusServerListenResult
_dbus_server_listen_platform_specific (DBusAddressEntry *entry,
                                       DBusServer      **server_p,
                                       DBusError        *error)
{
  const char *method;

  *server_p = NULL;
  
  method = dbus_address_entry_get_method (entry);

  if (strcmp (method, "unix") == 0)
    {
      const char *path = dbus_address_entry_get_value (entry, "path");
      const char *tmpdir = dbus_address_entry_get_value (entry, "tmpdir");
      const char *abstract = dbus_address_entry_get_value (entry, "abstract");
          
      if (path == NULL && tmpdir == NULL && abstract == NULL)
        {
          _dbus_set_bad_address(error, "unix",
                                "path or tmpdir or abstract",
                                NULL);
          return DBUS_SERVER_LISTEN_BAD_ADDRESS;
        }

      if ((path && tmpdir) ||
          (path && abstract) ||
          (tmpdir && abstract))
        {
          _dbus_set_bad_address(error, NULL, NULL,
                                "cannot specify two of \"path\" and \"tmpdir\" and \"abstract\" at the same time");
          return DBUS_SERVER_LISTEN_BAD_ADDRESS;
        }

      if (tmpdir != NULL)
        {
          DBusString full_path;
          DBusString filename;
              
          if (!_dbus_string_init (&full_path))
            {
              dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
              return DBUS_SERVER_LISTEN_DID_NOT_CONNECT;
            }
                  
          if (!_dbus_string_init (&filename))
            {
              _dbus_string_free (&full_path);
              dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
              return DBUS_SERVER_LISTEN_DID_NOT_CONNECT;
            }
              
          if (!_dbus_string_append (&filename,
                                    "dbus-") ||
              !_dbus_generate_random_ascii (&filename, 10) ||
              !_dbus_string_append (&full_path, tmpdir) ||
              !_dbus_concat_dir_and_file (&full_path, &filename))
            {
              _dbus_string_free (&full_path);
              _dbus_string_free (&filename);
              dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
              return DBUS_SERVER_LISTEN_DID_NOT_CONNECT;
            }
              
          /* Always use abstract namespace if possible with tmpdir */
              
          *server_p =
            _dbus_server_new_for_domain_socket (_dbus_string_get_const_data (&full_path),
#ifdef HAVE_ABSTRACT_SOCKETS
                                                TRUE,
#else
                                                FALSE,
#endif
                                                error);

          _dbus_string_free (&full_path);
          _dbus_string_free (&filename);
        }
      else
        {
          if (path)
            *server_p = _dbus_server_new_for_domain_socket (path, FALSE, error);
          else
            *server_p = _dbus_server_new_for_domain_socket (abstract, TRUE, error);
        }

      if (*server_p != NULL)
        {
          _DBUS_ASSERT_ERROR_IS_CLEAR(error);
          return DBUS_SERVER_LISTEN_OK;
        }
      else
        {
          _DBUS_ASSERT_ERROR_IS_SET(error);
          return DBUS_SERVER_LISTEN_DID_NOT_CONNECT;
        }
    }
  else
    {
      /* If we don't handle the method, we return NULL with the
       * error unset
       */
      _DBUS_ASSERT_ERROR_IS_CLEAR(error);
      return DBUS_SERVER_LISTEN_NOT_HANDLED;
    }
}

/**
 * Creates a new server listening on the given Unix domain socket.
 *
 * @param path the path for the domain socket.
 * @param abstract #TRUE to use abstract socket namespace
 * @param error location to store reason for failure.
 * @returns the new server, or #NULL on failure.
 */
DBusServer*
_dbus_server_new_for_domain_socket (const char     *path,
                                    dbus_bool_t     abstract,
                                    DBusError      *error)
{
  DBusServer *server;
  int listen_fd;
  DBusString address;
  char *path_copy;
  DBusString path_str;
  
  _DBUS_ASSERT_ERROR_IS_CLEAR (error);

  if (!_dbus_string_init (&address))
    {
      dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
      return NULL;
    }

  _dbus_string_init_const (&path_str, path);
  if ((abstract &&
       !_dbus_string_append (&address, "unix:abstract=")) ||
      (!abstract &&
       !_dbus_string_append (&address, "unix:path=")) ||
      !_dbus_address_append_escaped (&address, &path_str))
    {
      dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
      goto failed_0;
    }

  path_copy = _dbus_strdup (path);
  if (path_copy == NULL)
    {
      dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
      goto failed_0;
    }
  
  listen_fd = _dbus_listen_unix_socket (path, abstract, error);
  _dbus_fd_set_close_on_exec (listen_fd);
  
  if (listen_fd < 0)
    {
      _DBUS_ASSERT_ERROR_IS_SET (error);
      goto failed_1;
    }
  
  server = _dbus_server_new_for_socket (&listen_fd, 1, &address);
  if (server == NULL)
    {
      dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
      goto failed_2;
    }

  _dbus_server_socket_own_filename(server, path_copy);
  
  _dbus_string_free (&address);
  
  return server;

 failed_2:
  _dbus_close_socket (listen_fd, NULL);
 failed_1:
  dbus_free (path_copy);
 failed_0:
  _dbus_string_free (&address);

  return NULL;
}

/** @} */