D-Bus: dbus-server-unix.c Source File

D-Bus 1.12.20

dbus-server-unix.c
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
53 DBusServerListenResult
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 *dir = dbus_address_entry_get_value (entry, "dir");
68 const char *tmpdir = dbus_address_entry_get_value (entry, "tmpdir");
69 const char *abstract = dbus_address_entry_get_value (entry, "abstract");
70 const char *runtime = dbus_address_entry_get_value (entry, "runtime");
71 int mutually_exclusive_modes = 0;
72
73 mutually_exclusive_modes = (path != NULL) + (tmpdir != NULL) +
74 (abstract != NULL) + (runtime != NULL) + (dir != NULL);
75
76 if (mutually_exclusive_modes < 1)
77 {
78 _dbus_set_bad_address(error, "unix",
79 "path or tmpdir or abstract or runtime or dir",
80 NULL);
81 return DBUS_SERVER_LISTEN_BAD_ADDRESS;
82 }
83
84 if (mutually_exclusive_modes > 1)
85 {
86 _dbus_set_bad_address(error, NULL, NULL,
87 "cannot specify two of \"path\", \"tmpdir\", \"abstract\", \"runtime\" and \"dir\" at the same time");
88 return DBUS_SERVER_LISTEN_BAD_ADDRESS;
89 }
90
91 if (runtime != NULL)
92 {
93 DBusString full_path;
94 DBusString filename;
95 const char *runtimedir;
96
97 if (strcmp (runtime, "yes") != 0)
98 {
99 _dbus_set_bad_address(error, NULL, NULL,
100 "if given, the only value allowed for \"runtime\" is \"yes\"");
101 return DBUS_SERVER_LISTEN_BAD_ADDRESS;
102 }
103
104 runtimedir = _dbus_getenv ("XDG_RUNTIME_DIR");
105
106 if (runtimedir == NULL)
107 {
108 dbus_set_error (error,
109 DBUS_ERROR_NOT_SUPPORTED, "\"XDG_RUNTIME_DIR\" is not set");
110 return DBUS_SERVER_LISTEN_DID_NOT_CONNECT;
111 }
112
113 _dbus_string_init_const (&filename, "bus");
114
115 if (!_dbus_string_init (&full_path))
116 {
117 _DBUS_SET_OOM (error);
118 return DBUS_SERVER_LISTEN_DID_NOT_CONNECT;
119 }
120
121 if (!_dbus_string_append (&full_path, runtimedir) ||
122 !_dbus_concat_dir_and_file (&full_path, &filename))
123 {
124 _dbus_string_free (&full_path);
125 _DBUS_SET_OOM (error);
126 return DBUS_SERVER_LISTEN_DID_NOT_CONNECT;
127 }
128
129 /* We can safely use filesystem sockets in the runtime directory,
130 * and they are preferred because they can be bind-mounted between
131 * Linux containers. */
132 *server_p = _dbus_server_new_for_domain_socket (
133 _dbus_string_get_const_data (&full_path),
134 FALSE, error);
135
136 _dbus_string_free (&full_path);
137 }
138 else if (tmpdir != NULL || dir != NULL)
139 {
140 DBusString full_path;
141 DBusString filename;
142 dbus_bool_t use_abstract = FALSE;
143
144 if (tmpdir != NULL)
145 {
146 dir = tmpdir;
147
148 #ifdef __linux__
149 /* Use abstract sockets for tmpdir if supported, so that it
150 * never needs to be cleaned up. Use dir instead if you want a
151 * path-based socket. */
152 use_abstract = TRUE;
153 #endif
154 }
155
156 if (!_dbus_string_init (&full_path))
157 {
158 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
159 return DBUS_SERVER_LISTEN_DID_NOT_CONNECT;
160 }
161
162 if (!_dbus_string_init (&filename))
163 {
164 _dbus_string_free (&full_path);
165 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
166 return DBUS_SERVER_LISTEN_DID_NOT_CONNECT;
167 }
168
169 if (!_dbus_string_append (&filename, "dbus-"))
170 {
171 _dbus_string_free (&full_path);
172 _dbus_string_free (&filename);
173 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
174 return DBUS_SERVER_LISTEN_DID_NOT_CONNECT;
175 }
176
177 if (!_dbus_generate_random_ascii (&filename, 10, error))
178 {
179 _dbus_string_free (&full_path);
180 _dbus_string_free (&filename);
181 return DBUS_SERVER_LISTEN_DID_NOT_CONNECT;
182 }
183
184 if (!_dbus_string_append (&full_path, dir) ||
185 !_dbus_concat_dir_and_file (&full_path, &filename))
186 {
187 _dbus_string_free (&full_path);
188 _dbus_string_free (&filename);
189 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
190 return DBUS_SERVER_LISTEN_DID_NOT_CONNECT;
191 }
192
193 *server_p =
194 _dbus_server_new_for_domain_socket (_dbus_string_get_const_data (&full_path),
195 use_abstract,
196 error);
197
198 _dbus_string_free (&full_path);
199 _dbus_string_free (&filename);
200 }
201 else
202 {
203 if (path)
204 *server_p = _dbus_server_new_for_domain_socket (path, FALSE, error);
205 else
206 *server_p = _dbus_server_new_for_domain_socket (abstract, TRUE, error);
207 }
208
209 if (*server_p != NULL)
210 {
211 _DBUS_ASSERT_ERROR_IS_CLEAR(error);
212 return DBUS_SERVER_LISTEN_OK;
213 }
214 else
215 {
216 _DBUS_ASSERT_ERROR_IS_SET(error);
217 return DBUS_SERVER_LISTEN_DID_NOT_CONNECT;
218 }
219 }
220 else if (strcmp (method, "systemd") == 0)
221 {
222 int i, n;
223 DBusSocket *fds;
224 DBusString address;
225
226 n = _dbus_listen_systemd_sockets (&fds, error);
227 if (n < 0)
228 {
229 _DBUS_ASSERT_ERROR_IS_SET (error);
230 return DBUS_SERVER_LISTEN_DID_NOT_CONNECT;
231 }
232
233 if (!_dbus_string_init (&address))
234 goto systemd_oom;
235
236 for (i = 0; i < n; i++)
237 {
238 if (i > 0)
239 {
240 if (!_dbus_string_append (&address, ";"))
241 goto systemd_oom;
242 }
243 if (!_dbus_append_address_from_socket (fds[i], &address, error))
244 goto systemd_err;
245 }
246
247 *server_p = _dbus_server_new_for_socket (fds, n, &address, NULL, error);
248 if (*server_p == NULL)
249 goto systemd_err;
250
251 dbus_free (fds);
252 _dbus_string_free (&address);
253
254 return DBUS_SERVER_LISTEN_OK;
255
256 systemd_oom:
257 _DBUS_SET_OOM (error);
258 systemd_err:
259 for (i = 0; i < n; i++)
260 {
261 _dbus_close_socket (fds[i], NULL);
262 }
263 dbus_free (fds);
264 _dbus_string_free (&address);
265
266 return DBUS_SERVER_LISTEN_DID_NOT_CONNECT;
267 }
268 #ifdef DBUS_ENABLE_LAUNCHD
269 else if (strcmp (method, "launchd") == 0)
270 {
271 const char *launchd_env_var = dbus_address_entry_get_value (entry, "env");
272 if (launchd_env_var == NULL)
273 {
274 _dbus_set_bad_address (error, "launchd", "env", NULL);
275 return DBUS_SERVER_LISTEN_DID_NOT_CONNECT;
276 }
277 *server_p = _dbus_server_new_for_launchd (launchd_env_var, error);
278
279 if (*server_p != NULL)
280 {
281 _DBUS_ASSERT_ERROR_IS_CLEAR(error);
282 return DBUS_SERVER_LISTEN_OK;
283 }
284 else
285 {
286 _DBUS_ASSERT_ERROR_IS_SET(error);
287 return DBUS_SERVER_LISTEN_DID_NOT_CONNECT;
288 }
289 }
290 #endif
291 else
292 {
293 /* If we don't handle the method, we return NULL with the
294 * error unset
295 */
296 _DBUS_ASSERT_ERROR_IS_CLEAR(error);
297 return DBUS_SERVER_LISTEN_NOT_HANDLED;
298 }
299 }
300
309 DBusServer*
310 _dbus_server_new_for_domain_socket (const char *path,
311 dbus_bool_t abstract,
312 DBusError *error)
313 {
314 DBusServer *server;
315 DBusSocket listen_fd;
316 DBusString address;
317 char *path_copy;
318 DBusString path_str;
319
320 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
321
322 if (!_dbus_string_init (&address))
323 {
324 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
325 return NULL;
326 }
327
328 _dbus_string_init_const (&path_str, path);
329 if ((abstract &&
330 !_dbus_string_append (&address, "unix:abstract=")) ||
331 (!abstract &&
332 !_dbus_string_append (&address, "unix:path=")) ||
333 !_dbus_address_append_escaped (&address, &path_str))
334 {
335 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
336 goto failed_0;
337 }
338
339 if (abstract)
340 {
341 path_copy = NULL;
342 }
343 else
344 {
345 path_copy = _dbus_strdup (path);
346 if (path_copy == NULL)
347 {
348 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
349 goto failed_0;
350 }
351 }
352
353 listen_fd.fd = _dbus_listen_unix_socket (path, abstract, error);
354
355 if (listen_fd.fd < 0)
356 {
357 _DBUS_ASSERT_ERROR_IS_SET (error);
358 goto failed_1;
359 }
360
361 server = _dbus_server_new_for_socket (&listen_fd, 1, &address, 0, error);
362 if (server == NULL)
363 {
364 goto failed_2;
365 }
366
367 if (path_copy != NULL)
368 _dbus_server_socket_own_filename(server, path_copy);
369
370 _dbus_string_free (&address);
371
372 return server;
373
374 failed_2:
375 _dbus_close_socket (listen_fd, NULL);
376 failed_1:
377 dbus_free (path_copy);
378 failed_0:
379 _dbus_string_free (&address);
380
381 return NULL;
382 }
383
_dbus_server_new_for_socket
DBusServer * _dbus_server_new_for_socket(DBusSocket *fds, int n_fds, const DBusString *address, DBusNonceFile *noncefile, DBusError *error)
Creates a new server listening on the given file descriptor.
Definition: dbus-server-socket.c:288
_dbus_append_address_from_socket
dbus_bool_t _dbus_append_address_from_socket(DBusSocket fd, DBusString *address, DBusError *error)
Read the address from the socket and append it to the string.
Definition: dbus-sysdeps-unix.c:4593
_dbus_concat_dir_and_file
dbus_bool_t _dbus_concat_dir_and_file(DBusString *dir, const DBusString *next_component)
Appends the given filename to the given directory.
Definition: dbus-sysdeps-unix.c:3109
_dbus_string_free
void _dbus_string_free(DBusString *str)
Frees a string created by _dbus_string_init().
Definition: dbus-string.c:259
_dbus_server_socket_own_filename
void _dbus_server_socket_own_filename(DBusServer *server, char *filename)
This is a bad hack since it's really unix domain socket specific.
Definition: dbus-server-socket.c:607
_dbus_listen_systemd_sockets
int _dbus_listen_systemd_sockets(DBusSocket **fds, DBusError *error)
Acquires one or more sockets passed in from systemd.
Definition: dbus-sysdeps-unix.c:1266
DBusServer
Definition: dbus-server-protected.h:57
dbus_address_entry_get_method
const char * dbus_address_entry_get_method(DBusAddressEntry *entry)
Returns the method string of an address entry.
Definition: dbus-address.c:227
_dbus_server_listen_platform_specific
DBusServerListenResult _dbus_server_listen_platform_specific(DBusAddressEntry *entry, DBusServer **server_p, DBusError *error)
Tries to interpret the address entry in a platform-specific way, creating a platform-specific server ...
Definition: dbus-server-unix.c:54
_dbus_listen_unix_socket
int _dbus_listen_unix_socket(const char *path, dbus_bool_t abstract, DBusError *error)
Creates a socket and binds it to the given path, then listens on the socket.
Definition: dbus-sysdeps-unix.c:1139
_dbus_string_init
dbus_bool_t _dbus_string_init(DBusString *str)
Initializes a string.
Definition: dbus-string.c:175
TRUE
#define TRUE
dbus_address_entry_get_value
const char * dbus_address_entry_get_value(DBusAddressEntry *entry, const char *key)
Returns a value from a key of an entry.
Definition: dbus-address.c:244
dbus_free
void dbus_free(void *memory)
Frees a block of memory previously allocated by dbus_malloc() or dbus_malloc0().
Definition: dbus-memory.c:702
_dbus_generate_random_ascii
dbus_bool_t _dbus_generate_random_ascii(DBusString *str, int n_bytes, DBusError *error)
Generates the given number of random bytes, where the bytes are chosen from the alphanumeric ASCII su...
Definition: dbus-sysdeps.c:552
DBusString
Definition: dbus-string.h:43
DBusSocket
Socket interface.
Definition: dbus-sysdeps.h:175
DBusAddressEntry
Internals of DBusAddressEntry.
Definition: dbus-address.c:44
FALSE
#define FALSE
DBUS_ERROR_NO_MEMORY
#define DBUS_ERROR_NO_MEMORY
There was not enough memory to complete an operation.
Definition: dbus-protocol.h:357
_dbus_set_bad_address
void _dbus_set_bad_address(DBusError *error, const char *address_problem_type, const char *address_problem_field, const char *address_problem_other)
Sets DBUS_ERROR_BAD_ADDRESS.
Definition: dbus-address.c:65
_dbus_getenv
const char * _dbus_getenv(const char *varname)
Wrapper for getenv().
Definition: dbus-sysdeps.c:187
_dbus_close_socket
dbus_bool_t _dbus_close_socket(DBusSocket fd, DBusError *error)
Closes a socket.
Definition: dbus-sysdeps-unix.c:286
_dbus_address_append_escaped
dbus_bool_t _dbus_address_append_escaped(DBusString *escaped, const DBusString *unescaped)
Appends an escaped version of one string to another string, using the D-Bus address escaping mechanis...
Definition: dbus-address.c:104
_dbus_strdup
char * _dbus_strdup(const char *str)
Duplicates a string.
Definition: dbus-internals.c:536
_dbus_server_new_for_domain_socket
DBusServer * _dbus_server_new_for_domain_socket(const char *path, dbus_bool_t abstract, DBusError *error)
Creates a new server listening on the given Unix domain socket.
Definition: dbus-server-unix.c:310
DBusError
Object representing an exception.
Definition: dbus-errors.h:49
dbus_set_error
void dbus_set_error(DBusError *error, const char *name, const char *format,...)
Assigns an error name and message to a DBusError.
Definition: dbus-errors.c:354
_dbus_server_new_for_launchd
DBusServer * _dbus_server_new_for_launchd(const char *launchd_env_var, DBusError *error)
Creates a new server from launchd.
Definition: dbus-server-launchd.c:66
_dbus_string_init_const
void _dbus_string_init_const(DBusString *str, const char *value)
Initializes a constant string.
Definition: dbus-string.c:190
DBUS_ERROR_NOT_SUPPORTED
#define DBUS_ERROR_NOT_SUPPORTED
Requested operation isn't supported (like ENOSYS on UNIX).
Definition: dbus-protocol.h:369
_dbus_string_append
dbus_bool_t _dbus_string_append(DBusString *str, const char *buffer)
Appends a nul-terminated C-style string to a DBusString.
Definition: dbus-string.c:935
dbus_bool_t
dbus_uint32_t dbus_bool_t
Definition: dbus-types.h:35
NULL
#define NULL