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

D-Bus 1.16.2

dbus-transport-unix.c
1/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
2/* dbus-transport-unix.c UNIX socket subclasses of DBusTransport
3 *
4 * Copyright (C) 2002, 2003, 2004 Red Hat Inc.
5 *
6 * SPDX-License-Identifier: AFL-2.1 OR GPL-2.0-or-later
7 *
8 * Licensed under the Academic Free License version 2.1
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 *
24 */
25
26#include <config.h>
27
28#include <stdio.h>
29
30#include "dbus-internals.h"
31#include "dbus-connection-internal.h"
32#include "dbus-transport-unix.h"
33#include "dbus-transport-socket.h"
34#include "dbus-transport-protected.h"
35#include "dbus-watch.h"
36#include "dbus-sysdeps-unix.h"
37#include "dbus-test.h"
38
58static DBusTransport*
59_dbus_transport_new_for_exec (const char *path,
60 char *const argv[],
61 DBusError *error)
62{
63 DBusSocket fd = DBUS_SOCKET_INIT;
64 DBusTransport *transport;
65 DBusString address;
66 unsigned i;
67 char *escaped;
68
69 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
70
71 if (!_dbus_string_init (&address))
72 {
73 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
74 return NULL;
75 }
76
77 escaped = dbus_address_escape_value (path);
78 if (!escaped)
79 {
80 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
81 goto failed;
82 }
83
84 if (!_dbus_string_append (&address, "unixexec:path=") ||
85 !_dbus_string_append (&address, escaped))
86 {
87 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
88 dbus_free (escaped);
89 goto failed;
90 }
91
92 dbus_free (escaped);
93
94 if (argv)
95 {
96 for (i = 0; argv[i]; i++)
97 {
98 dbus_bool_t success;
99
100 escaped = dbus_address_escape_value (argv[i]);
101 if (!escaped)
102 {
103 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
104 goto failed;
105 }
106
107 success = _dbus_string_append_printf (&address, ",argv%u=%s", i, escaped);
108 dbus_free (escaped);
109
110 if (!success)
111 {
112 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
113 goto failed;
114 }
115 }
116 }
117
118 fd = _dbus_connect_exec (path, argv, error);
119 if (!_dbus_socket_is_valid (fd))
120 {
121 _DBUS_ASSERT_ERROR_IS_SET (error);
122 goto failed;
123 }
124
125 _dbus_verbose ("Successfully connected to process %s\n",
126 path);
127
128 transport = _dbus_transport_new_for_socket (fd, NULL, &address);
129 if (transport == NULL)
130 {
131 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
132 goto failed;
133 }
134
135 _dbus_string_free (&address);
136
137 return transport;
138
139 failed:
140 if (_dbus_socket_is_valid (fd))
141 _dbus_close_socket (&fd, NULL);
142
143 _dbus_string_free (&address);
144 return NULL;
145}
146
147
148DBusTransportOpenResult
149_dbus_transport_open_unixexec (DBusAddressEntry *entry,
150 DBusTransport **transport_p,
151 DBusError *error)
152{
153 const char *method;
154
155 method = dbus_address_entry_get_method (entry);
156 _dbus_assert (method != NULL);
157
158 if (strcmp (method, "unixexec") == 0)
159 {
160 const char *path;
161 unsigned i;
162 char **argv;
163
164 path = dbus_address_entry_get_value (entry, "path");
165 if (path == NULL)
166 {
167 _dbus_set_bad_address (error, NULL, NULL,
168 "No process path specified");
169 return DBUS_TRANSPORT_OPEN_BAD_ADDRESS;
170 }
171
172 /* First count argv arguments */
173 for (i = 1; ; i++)
174 {
175 char t[4+20+1]; /* "argv" plus space for a formatted base 10 64bit integer, plus NUL */
176
177 snprintf (t, sizeof(t), "argv%u", i);
178
179 if (!dbus_address_entry_get_value (entry, t))
180 break;
181 }
182
183 /* Allocate string array */
184 argv = dbus_new0 (char*, i+1);
185 if (!argv)
186 {
187 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
188 return DBUS_TRANSPORT_OPEN_DID_NOT_CONNECT;
189 }
190
191 /* Fill in string array */
192 for (i = 0; ; i++)
193 {
194 char t[4+20+1];
195 const char *p;
196
197 snprintf (t, sizeof(t), "argv%u", i);
198
199 p = dbus_address_entry_get_value (entry, t);
200 if (!p)
201 {
202 if (i == 0)
203 /* If argv0 isn't specified, fill in the path instead */
204 p = path;
205 else
206 break;
207 }
208
209 argv[i] = _dbus_strdup (p);
210 if (!argv[i])
211 {
212 dbus_free_string_array (argv);
213 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
214 return DBUS_TRANSPORT_OPEN_DID_NOT_CONNECT;
215 }
216 }
217
218 *transport_p = _dbus_transport_new_for_exec (path, argv, error);
219 dbus_free_string_array (argv);
220
221 if (*transport_p == NULL)
222 {
223 _DBUS_ASSERT_ERROR_IS_SET (error);
224 return DBUS_TRANSPORT_OPEN_DID_NOT_CONNECT;
225 }
226 else
227 {
228 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
229 return DBUS_TRANSPORT_OPEN_OK;
230 }
231 }
232 else
233 {
234 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
235 return DBUS_TRANSPORT_OPEN_NOT_HANDLED;
236 }
237}
238
247DBusTransportOpenResult
248_dbus_transport_open_platform_specific (DBusAddressEntry *entry,
249 DBusTransport **transport_p,
250 DBusError *error)
251{
252#ifdef DBUS_ENABLE_LAUNCHD
253 const char *method;
254
255 method = dbus_address_entry_get_method (entry);
256 _dbus_assert (method != NULL);
257
258 if (strcmp (method, "launchd") == 0)
259 {
260 DBusError tmp_error = DBUS_ERROR_INIT;
261 const char *launchd_env_var = dbus_address_entry_get_value (entry, "env");
262 const char *launchd_socket;
263 DBusString socket_path;
264 dbus_bool_t valid_socket;
265
266 if (!_dbus_string_init (&socket_path))
267 {
268 _DBUS_SET_OOM (error);
269 return FALSE;
270 }
271
272 if (launchd_env_var == NULL)
273 {
274 _dbus_set_bad_address (error, "launchd", "env", NULL);
275 return DBUS_TRANSPORT_OPEN_BAD_ADDRESS;
276 }
277
278 valid_socket = _dbus_lookup_launchd_socket (&socket_path, launchd_env_var, error);
279
280 if (dbus_error_is_set(error))
281 {
282 _dbus_string_free(&socket_path);
283 return DBUS_TRANSPORT_OPEN_DID_NOT_CONNECT;
284 }
285
286 if (!valid_socket)
287 {
288 dbus_set_error(&tmp_error, DBUS_ERROR_BAD_ADDRESS,
289 "launchd's env var %s does not exist", launchd_env_var);
290 dbus_error_free(error);
291 dbus_move_error(&tmp_error, error);
292 return DBUS_TRANSPORT_OPEN_DID_NOT_CONNECT;
293 }
294
295 launchd_socket = _dbus_string_get_const_data(&socket_path);
296 *transport_p = _dbus_transport_new_for_domain_socket (launchd_socket, FALSE, error);
297
298 if (*transport_p == NULL)
299 {
300 _DBUS_ASSERT_ERROR_IS_SET (error);
301 return DBUS_TRANSPORT_OPEN_DID_NOT_CONNECT;
302 }
303 else
304 {
305 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
306 return DBUS_TRANSPORT_OPEN_OK;
307 }
308 }
309 else
310#endif /* DBUS_ENABLE_LAUNCHD */
311 {
312 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
313 return DBUS_TRANSPORT_OPEN_NOT_HANDLED;
314 }
315}
316
_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:70
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:232
dbus_address_escape_value
char * dbus_address_escape_value(const char *value)
Escapes the given string as a value in a key=value pair for a D-Bus address.
Definition dbus-address.c:588
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:249
DBUS_ERROR_INIT
#define DBUS_ERROR_INIT
Expands to a suitable initializer for a DBusError on the stack.
Definition dbus-errors.h:64
dbus_move_error
void dbus_move_error(DBusError *src, DBusError *dest)
Moves an error src into dest, freeing src and overwriting dest.
Definition dbus-errors.c:281
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:356
dbus_error_free
void dbus_error_free(DBusError *error)
Frees an error that's been set (or just initialized), then reinitializes the error as in dbus_error_i...
Definition dbus-errors.c:213
dbus_error_is_set
dbus_bool_t dbus_error_is_set(const DBusError *error)
Checks whether an error occurred (the error is set).
Definition dbus-errors.c:331
_dbus_assert
#define _dbus_assert(condition)
Aborts with an error message if the condition is false.
Definition dbus-internals.h:153
_dbus_strdup
char * _dbus_strdup(const char *str)
Duplicates a string.
Definition dbus-internals.c:621
NULL
#define NULL
A null pointer, defined appropriately for C or C++.
Definition dbus-macros.h:51
FALSE
#define FALSE
Expands to "0".
Definition dbus-macros.h:44
dbus_free
void dbus_free(void *memory)
Frees a block of memory previously allocated by dbus_malloc() or dbus_malloc0().
Definition dbus-memory.c:710
dbus_new0
#define dbus_new0(type, count)
Safe macro for using dbus_malloc0().
Definition dbus-memory.h:60
dbus_free_string_array
void dbus_free_string_array(char **str_array)
Frees a NULL-terminated array of strings.
Definition dbus-memory.c:758
DBUS_ERROR_BAD_ADDRESS
#define DBUS_ERROR_BAD_ADDRESS
A D-Bus bus address was malformed.
Definition dbus-protocol.h:373
DBUS_ERROR_NO_MEMORY
#define DBUS_ERROR_NO_MEMORY
There was not enough memory to complete an operation.
Definition dbus-protocol.h:363
_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:980
_dbus_string_init
dbus_bool_t _dbus_string_init(DBusString *str)
Initializes a string.
Definition dbus-string.c:182
_dbus_string_free
void _dbus_string_free(DBusString *str)
Frees a string created by _dbus_string_init(), and fills it with the same contents as _DBUS_STRING_IN...
Definition dbus-string.c:278
_dbus_string_append_printf
dbus_bool_t _dbus_string_append_printf(DBusString *str, const char *format,...)
Appends a printf-style formatted string to the DBusString.
Definition dbus-string.c:1147
_dbus_lookup_launchd_socket
dbus_bool_t _dbus_lookup_launchd_socket(DBusString *socket_path, const char *launchd_env_var, DBusError *error)
quries launchd for a specific env var which holds the socket path.
Definition dbus-sysdeps-unix.c:4486
_dbus_close_socket
dbus_bool_t _dbus_close_socket(DBusSocket *fd, DBusError *error)
Closes a socket and invalidates it.
Definition dbus-sysdeps-unix.c:314
_dbus_connect_exec
DBusSocket _dbus_connect_exec(const char *path, char *const argv[], DBusError *error)
Creates a UNIX domain socket and connects it to the specified process to execute.
Definition dbus-sysdeps-unix.c:1054
_dbus_transport_new_for_socket
DBusTransport * _dbus_transport_new_for_socket(DBusSocket fd, const DBusString *server_guid, const DBusString *address)
Creates a new transport for the given socket file descriptor.
Definition dbus-transport-socket.c:1295
_dbus_transport_new_for_domain_socket
DBusTransport * _dbus_transport_new_for_domain_socket(const char *path, dbus_bool_t abstract, DBusError *error)
Creates a new transport for the given Unix domain socket path.
Definition dbus-transport-socket.c:1518
_dbus_transport_open_platform_specific
DBusTransportOpenResult _dbus_transport_open_platform_specific(DBusAddressEntry *entry, DBusTransport **transport_p, DBusError *error)
Opens platform specific transport types.
Definition dbus-transport-unix.c:248
DBusAddressEntry
Internals of DBusAddressEntry.
Definition dbus-address.c:49
DBusError
Object representing an exception.
Definition dbus-errors.h:51
DBusSocket
Socket interface.
Definition dbus-sysdeps.h:185
DBusString
Definition dbus-string.h:47
DBusTransport
Object representing a transport such as a socket.
Definition dbus-transport-protected.h:83