1/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
2/* dbus-server-unix.c Server implementation for Unix network protocols.
3 *
4 * Copyright (C) 2002, 2003, 2004  Red Hat Inc.
5 *
6 * Licensed under the Academic Free License version 2.1
7 *
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.
12 *
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.
17 *
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
21 *
22 */
23
24#include <config.h>
25#include "dbus-internals.h"
26#include "dbus-server-unix.h"
27#include "dbus-server-socket.h"
28#include "dbus-transport-unix.h"
29#include "dbus-connection-internal.h"
30#include "dbus-sysdeps-unix.h"
31#include "dbus-string.h"
32
33/**
34 * @defgroup DBusServerUnix DBusServer implementations for UNIX
35 * @ingroup  DBusInternals
36 * @brief Implementation details of DBusServer on UNIX
37 *
38 * @{
39 */
40
41/**
42 * Tries to interpret the address entry in a platform-specific
43 * way, creating a platform-specific server type if appropriate.
44 * Sets error if the result is not OK.
45 *
46 * @param entry an address entry
47 * @param server_p location to store a new DBusServer, or #NULL on failure.
48 * @param error location to store rationale for failure on bad address
49 * @returns the outcome
50 *
51 */
52DBusServerListenResult
53_dbus_server_listen_platform_specific (DBusAddressEntry *entry,
54                                       DBusServer      **server_p,
55                                       DBusError        *error)
56{
57  const char *method;
58
59  *server_p = NULL;
60
61  method = dbus_address_entry_get_method (entry);
62
63  if (strcmp (method, "unix") == 0)
64    {
65      const char *path = dbus_address_entry_get_value (entry, "path");
66      const char *tmpdir = dbus_address_entry_get_value (entry, "tmpdir");
67      const char *abstract = dbus_address_entry_get_value (entry, "abstract");
68
69      if (path == NULL && tmpdir == NULL && abstract == NULL)
70        {
71          _dbus_set_bad_address(error, "unix",
72                                "path or tmpdir or abstract",
73                                NULL);
74          return DBUS_SERVER_LISTEN_BAD_ADDRESS;
75        }
76
77      if ((path && tmpdir) ||
78          (path && abstract) ||
79          (tmpdir && abstract))
80        {
81          _dbus_set_bad_address(error, NULL, NULL,
82                                "cannot specify two of \"path\" and \"tmpdir\" and \"abstract\" at the same time");
83          return DBUS_SERVER_LISTEN_BAD_ADDRESS;
84        }
85
86      if (tmpdir != NULL)
87        {
88          DBusString full_path;
89          DBusString filename;
90
91          if (!_dbus_string_init (&full_path))
92            {
93              dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
94              return DBUS_SERVER_LISTEN_DID_NOT_CONNECT;
95            }
96
97          if (!_dbus_string_init (&filename))
98            {
99              _dbus_string_free (&full_path);
100              dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
101              return DBUS_SERVER_LISTEN_DID_NOT_CONNECT;
102            }
103
104          if (!_dbus_string_append (&filename,
105                                    "dbus-") ||
106              !_dbus_generate_random_ascii (&filename, 10) ||
107              !_dbus_string_append (&full_path, tmpdir) ||
108              !_dbus_concat_dir_and_file (&full_path, &filename))
109            {
110              _dbus_string_free (&full_path);
111              _dbus_string_free (&filename);
112              dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
113              return DBUS_SERVER_LISTEN_DID_NOT_CONNECT;
114            }
115
116          /* Always use abstract namespace if possible with tmpdir */
117
118          *server_p =
119            _dbus_server_new_for_domain_socket (_dbus_string_get_const_data (&full_path),
120#ifdef HAVE_ABSTRACT_SOCKETS
121                                                TRUE,
122#else
123                                                FALSE,
124#endif
125                                                error);
126
127          _dbus_string_free (&full_path);
128          _dbus_string_free (&filename);
129        }
130      else
131        {
132          if (path)
133            *server_p = _dbus_server_new_for_domain_socket (path, FALSE, error);
134          else
135            *server_p = _dbus_server_new_for_domain_socket (abstract, TRUE, error);
136        }
137
138      if (*server_p != NULL)
139        {
140          _DBUS_ASSERT_ERROR_IS_CLEAR(error);
141          return DBUS_SERVER_LISTEN_OK;
142        }
143      else
144        {
145          _DBUS_ASSERT_ERROR_IS_SET(error);
146          return DBUS_SERVER_LISTEN_DID_NOT_CONNECT;
147        }
148    }
149  else if (strcmp (method, "systemd") == 0)
150    {
151      int n, *fds;
152      DBusString address;
153
154      n = _dbus_listen_systemd_sockets (&fds, error);
155      if (n < 0)
156        {
157          _DBUS_ASSERT_ERROR_IS_SET (error);
158          return DBUS_SERVER_LISTEN_DID_NOT_CONNECT;
159        }
160
161      _dbus_string_init_const (&address, "systemd:");
162
163      *server_p = _dbus_server_new_for_socket (fds, n, &address, NULL);
164      if (*server_p == NULL)
165        {
166          int i;
167
168          for (i = 0; i < n; i++)
169            {
170              _dbus_close_socket (fds[i], NULL);
171            }
172          dbus_free (fds);
173
174          dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
175          return DBUS_SERVER_LISTEN_DID_NOT_CONNECT;
176        }
177
178      dbus_free (fds);
179
180      return DBUS_SERVER_LISTEN_OK;
181    }
182  else
183    {
184      /* If we don't handle the method, we return NULL with the
185       * error unset
186       */
187      _DBUS_ASSERT_ERROR_IS_CLEAR(error);
188      return DBUS_SERVER_LISTEN_NOT_HANDLED;
189    }
190}
191
192/**
193 * Creates a new server listening on the given Unix domain socket.
194 *
195 * @param path the path for the domain socket.
196 * @param abstract #TRUE to use abstract socket namespace
197 * @param error location to store reason for failure.
198 * @returns the new server, or #NULL on failure.
199 */
200DBusServer*
201_dbus_server_new_for_domain_socket (const char     *path,
202                                    dbus_bool_t     abstract,
203                                    DBusError      *error)
204{
205  DBusServer *server;
206  int listen_fd;
207  DBusString address;
208  char *path_copy;
209  DBusString path_str;
210
211  _DBUS_ASSERT_ERROR_IS_CLEAR (error);
212
213  if (!_dbus_string_init (&address))
214    {
215      dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
216      return NULL;
217    }
218
219  _dbus_string_init_const (&path_str, path);
220  if ((abstract &&
221       !_dbus_string_append (&address, "unix:abstract=")) ||
222      (!abstract &&
223       !_dbus_string_append (&address, "unix:path=")) ||
224      !_dbus_address_append_escaped (&address, &path_str))
225    {
226      dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
227      goto failed_0;
228    }
229
230  path_copy = _dbus_strdup (path);
231  if (path_copy == NULL)
232    {
233      dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
234      goto failed_0;
235    }
236
237  listen_fd = _dbus_listen_unix_socket (path, abstract, error);
238
239  if (listen_fd < 0)
240    {
241      _DBUS_ASSERT_ERROR_IS_SET (error);
242      goto failed_1;
243    }
244
245  server = _dbus_server_new_for_socket (&listen_fd, 1, &address, 0);
246  if (server == NULL)
247    {
248      dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
249      goto failed_2;
250    }
251
252  _dbus_server_socket_own_filename(server, path_copy);
253
254  _dbus_string_free (&address);
255
256  return server;
257
258 failed_2:
259  _dbus_close_socket (listen_fd, NULL);
260 failed_1:
261  dbus_free (path_copy);
262 failed_0:
263  _dbus_string_free (&address);
264
265  return NULL;
266}
267
268/** @} */
269