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-server-launchd.h"
29 #include "dbus-transport-unix.h"
30 #include "dbus-connection-internal.h"
31 #include "dbus-sysdeps-unix.h"
32 #include "dbus-string.h"
33
34 /**
35 * @defgroup DBusServerUnix DBusServer implementations for UNIX
36 * @ingroup DBusInternals
37 * @brief Implementation details of DBusServer on UNIX
38 *
39 * @{
40 */
41
42 /**
43 * Tries to interpret the address entry in a platform-specific
44 * way, creating a platform-specific server type if appropriate.
45 * Sets error if the result is not OK.
46 *
47 * @param entry an address entry
48 * @param server_p location to store a new DBusServer, or #NULL on failure.
49 * @param error location to store rationale for failure on bad address
50 * @returns the outcome
51 *
52 */
53 DBusServerListenResult
_dbus_server_listen_platform_specific(DBusAddressEntry * entry,DBusServer ** server_p,DBusError * error)54 _dbus_server_listen_platform_specific (DBusAddressEntry *entry,
55 DBusServer **server_p,
56 DBusError *error)
57 {
58 const char *method;
59
60 *server_p = NULL;
61
62 method = dbus_address_entry_get_method (entry);
63
64 if (strcmp (method, "unix") == 0)
65 {
66 const char *path = dbus_address_entry_get_value (entry, "path");
67 const char *tmpdir = dbus_address_entry_get_value (entry, "tmpdir");
68 const char *abstract = dbus_address_entry_get_value (entry, "abstract");
69
70 if (path == NULL && tmpdir == NULL && abstract == NULL)
71 {
72 _dbus_set_bad_address(error, "unix",
73 "path or tmpdir or abstract",
74 NULL);
75 return DBUS_SERVER_LISTEN_BAD_ADDRESS;
76 }
77
78 if ((path && tmpdir) ||
79 (path && abstract) ||
80 (tmpdir && abstract))
81 {
82 _dbus_set_bad_address(error, NULL, NULL,
83 "cannot specify two of \"path\" and \"tmpdir\" and \"abstract\" at the same time");
84 return DBUS_SERVER_LISTEN_BAD_ADDRESS;
85 }
86
87 if (tmpdir != NULL)
88 {
89 DBusString full_path;
90 DBusString filename;
91
92 if (!_dbus_string_init (&full_path))
93 {
94 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
95 return DBUS_SERVER_LISTEN_DID_NOT_CONNECT;
96 }
97
98 if (!_dbus_string_init (&filename))
99 {
100 _dbus_string_free (&full_path);
101 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
102 return DBUS_SERVER_LISTEN_DID_NOT_CONNECT;
103 }
104
105 if (!_dbus_string_append (&filename,
106 "dbus-") ||
107 !_dbus_generate_random_ascii (&filename, 10) ||
108 !_dbus_string_append (&full_path, tmpdir) ||
109 !_dbus_concat_dir_and_file (&full_path, &filename))
110 {
111 _dbus_string_free (&full_path);
112 _dbus_string_free (&filename);
113 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
114 return DBUS_SERVER_LISTEN_DID_NOT_CONNECT;
115 }
116
117 /* Always use abstract namespace if possible with tmpdir */
118
119 *server_p =
120 _dbus_server_new_for_domain_socket (_dbus_string_get_const_data (&full_path),
121 #ifdef HAVE_ABSTRACT_SOCKETS
122 TRUE,
123 #else
124 FALSE,
125 #endif
126 error);
127
128 _dbus_string_free (&full_path);
129 _dbus_string_free (&filename);
130 }
131 else
132 {
133 if (path)
134 *server_p = _dbus_server_new_for_domain_socket (path, FALSE, error);
135 else
136 *server_p = _dbus_server_new_for_domain_socket (abstract, TRUE, error);
137 }
138
139 if (*server_p != NULL)
140 {
141 _DBUS_ASSERT_ERROR_IS_CLEAR(error);
142 return DBUS_SERVER_LISTEN_OK;
143 }
144 else
145 {
146 _DBUS_ASSERT_ERROR_IS_SET(error);
147 return DBUS_SERVER_LISTEN_DID_NOT_CONNECT;
148 }
149 }
150 else if (strcmp (method, "systemd") == 0)
151 {
152 int n, *fds;
153 DBusString address;
154
155 n = _dbus_listen_systemd_sockets (&fds, error);
156 if (n < 0)
157 {
158 _DBUS_ASSERT_ERROR_IS_SET (error);
159 return DBUS_SERVER_LISTEN_DID_NOT_CONNECT;
160 }
161
162 _dbus_string_init_const (&address, "systemd:");
163
164 *server_p = _dbus_server_new_for_socket (fds, n, &address, NULL);
165 if (*server_p == NULL)
166 {
167 int i;
168
169 for (i = 0; i < n; i++)
170 {
171 _dbus_close_socket (fds[i], NULL);
172 }
173 dbus_free (fds);
174
175 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
176 return DBUS_SERVER_LISTEN_DID_NOT_CONNECT;
177 }
178
179 dbus_free (fds);
180
181 return DBUS_SERVER_LISTEN_OK;
182 }
183 #ifdef DBUS_ENABLE_LAUNCHD
184 else if (strcmp (method, "launchd") == 0)
185 {
186 const char *launchd_env_var = dbus_address_entry_get_value (entry, "env");
187 if (launchd_env_var == NULL)
188 {
189 _dbus_set_bad_address (error, "launchd", "env", NULL);
190 return DBUS_SERVER_LISTEN_DID_NOT_CONNECT;
191 }
192 *server_p = _dbus_server_new_for_launchd (launchd_env_var, error);
193
194 if (*server_p != NULL)
195 {
196 _DBUS_ASSERT_ERROR_IS_CLEAR(error);
197 return DBUS_SERVER_LISTEN_OK;
198 }
199 else
200 {
201 _DBUS_ASSERT_ERROR_IS_SET(error);
202 return DBUS_SERVER_LISTEN_DID_NOT_CONNECT;
203 }
204 }
205 #endif
206 else
207 {
208 /* If we don't handle the method, we return NULL with the
209 * error unset
210 */
211 _DBUS_ASSERT_ERROR_IS_CLEAR(error);
212 return DBUS_SERVER_LISTEN_NOT_HANDLED;
213 }
214 }
215
216 /**
217 * Creates a new server listening on the given Unix domain socket.
218 *
219 * @param path the path for the domain socket.
220 * @param abstract #TRUE to use abstract socket namespace
221 * @param error location to store reason for failure.
222 * @returns the new server, or #NULL on failure.
223 */
224 DBusServer*
_dbus_server_new_for_domain_socket(const char * path,dbus_bool_t abstract,DBusError * error)225 _dbus_server_new_for_domain_socket (const char *path,
226 dbus_bool_t abstract,
227 DBusError *error)
228 {
229 DBusServer *server;
230 int listen_fd;
231 DBusString address;
232 char *path_copy;
233 DBusString path_str;
234
235 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
236
237 if (!_dbus_string_init (&address))
238 {
239 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
240 return NULL;
241 }
242
243 _dbus_string_init_const (&path_str, path);
244 if ((abstract &&
245 !_dbus_string_append (&address, "unix:abstract=")) ||
246 (!abstract &&
247 !_dbus_string_append (&address, "unix:path=")) ||
248 !_dbus_address_append_escaped (&address, &path_str))
249 {
250 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
251 goto failed_0;
252 }
253
254 if (abstract)
255 {
256 path_copy = NULL;
257 }
258 else
259 {
260 path_copy = _dbus_strdup (path);
261 if (path_copy == NULL)
262 {
263 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
264 goto failed_0;
265 }
266 }
267
268 listen_fd = _dbus_listen_unix_socket (path, abstract, error);
269
270 if (listen_fd < 0)
271 {
272 _DBUS_ASSERT_ERROR_IS_SET (error);
273 goto failed_1;
274 }
275
276 server = _dbus_server_new_for_socket (&listen_fd, 1, &address, 0);
277 if (server == NULL)
278 {
279 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
280 goto failed_2;
281 }
282
283 if (path_copy != NULL)
284 _dbus_server_socket_own_filename(server, path_copy);
285
286 _dbus_string_free (&address);
287
288 return server;
289
290 failed_2:
291 _dbus_close_socket (listen_fd, NULL);
292 failed_1:
293 dbus_free (path_copy);
294 failed_0:
295 _dbus_string_free (&address);
296
297 return NULL;
298 }
299
300 /** @} */
301