1 /* GDBus - GLib D-Bus Library
3 * Copyright (C) 2008-2010 Red Hat, Inc.
5 * SPDX-License-Identifier: LGPL-2.1-or-later
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General
18 * Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
20 * Author: David Zeuthen <davidz@redhat.com>
31 #include "gdbusutils.h"
32 #include "gdbusaddress.h"
33 #include "gdbuserror.h"
34 #include "gioenumtypes.h"
35 #include "glib-private.h"
36 #include "gnetworkaddress.h"
37 #include "gsocketclient.h"
38 #include "giostream.h"
39 #include "gasyncresult.h"
41 #include "glib-private.h"
42 #include "gdbusprivate.h"
52 #include <sys/types.h>
53 #include <gio/gunixsocketaddress.h>
62 #define FO_CLOEXEC "e"
70 * Routines for working with D-Bus addresses. A D-Bus address is a string
71 * like `unix:tmpdir=/tmp/my-app-name`. The exact format of addresses
72 * is explained in detail in the
73 * [D-Bus specification](http://dbus.freedesktop.org/doc/dbus-specification.html#addresses).
75 * TCP D-Bus connections are supported, but accessing them via a proxy is
76 * currently not supported.
78 * Since GLib 2.72, `unix:` addresses are supported on Windows with `AF_UNIX`
79 * support (Windows 10).
82 static gchar *get_session_address_platform_specific (GError **error);
83 static gchar *get_session_address_dbus_launch (GError **error);
85 /* ---------------------------------------------------------------------------------------------------- */
91 * Checks if @string is a
92 * [D-Bus address](https://dbus.freedesktop.org/doc/dbus-specification.html#addresses).
94 * This doesn't check if @string is actually supported by #GDBusServer
95 * or #GDBusConnection - use g_dbus_is_supported_address() to do more
98 * Returns: %TRUE if @string is a valid D-Bus address, %FALSE otherwise.
103 g_dbus_is_address (const gchar *string)
111 g_return_val_if_fail (string != NULL, FALSE);
113 a = g_strsplit (string, ";", 0);
117 for (n = 0; a[n] != NULL; n++)
119 if (!_g_dbus_address_parse_entry (a[n],
134 is_valid_unix (const gchar *address_entry,
135 GHashTable *key_value_pairs,
143 const gchar *abstract;
151 keys = g_hash_table_get_keys_as_ptr_array (key_value_pairs);
152 for (guint i = 0; i < keys->len; ++i)
154 const gchar *key = g_ptr_array_index (keys, i);
155 if (g_strcmp0 (key, "path") == 0)
156 path = g_hash_table_lookup (key_value_pairs, key);
157 else if (g_strcmp0 (key, "dir") == 0)
158 dir = g_hash_table_lookup (key_value_pairs, key);
159 else if (g_strcmp0 (key, "tmpdir") == 0)
160 tmpdir = g_hash_table_lookup (key_value_pairs, key);
161 else if (g_strcmp0 (key, "abstract") == 0)
162 abstract = g_hash_table_lookup (key_value_pairs, key);
163 else if (g_strcmp0 (key, "guid") != 0)
167 G_IO_ERROR_INVALID_ARGUMENT,
168 _("Unsupported key “%s” in address entry “%s”"),
175 /* Exactly one key must be set */
176 if ((path != NULL) + (dir != NULL) + (tmpdir != NULL) + (abstract != NULL) > 1)
180 G_IO_ERROR_INVALID_ARGUMENT,
181 _("Meaningless key/value pair combination in address entry “%s”"),
185 else if (path == NULL && dir == NULL && tmpdir == NULL && abstract == NULL)
189 G_IO_ERROR_INVALID_ARGUMENT,
190 _("Address “%s” is invalid (need exactly one of path, dir, tmpdir, or abstract keys)"),
198 g_ptr_array_unref (keys);
204 is_valid_nonce_tcp (const gchar *address_entry,
205 GHashTable *key_value_pairs,
213 const gchar *nonce_file;
223 keys = g_hash_table_get_keys_as_ptr_array (key_value_pairs);
224 for (guint i = 0; i < keys->len; ++i)
226 const gchar *key = g_ptr_array_index (keys, i);
227 if (g_strcmp0 (key, "host") == 0)
228 host = g_hash_table_lookup (key_value_pairs, key);
229 else if (g_strcmp0 (key, "port") == 0)
230 port = g_hash_table_lookup (key_value_pairs, key);
231 else if (g_strcmp0 (key, "family") == 0)
232 family = g_hash_table_lookup (key_value_pairs, key);
233 else if (g_strcmp0 (key, "noncefile") == 0)
234 nonce_file = g_hash_table_lookup (key_value_pairs, key);
235 else if (g_strcmp0 (key, "guid") != 0)
239 G_IO_ERROR_INVALID_ARGUMENT,
240 _("Unsupported key “%s” in address entry “%s”"),
249 port_num = strtol (port, &endp, 10);
250 if ((*port == '\0' || *endp != '\0') || port_num < 0 || port_num >= 65536)
254 G_IO_ERROR_INVALID_ARGUMENT,
255 _("Error in address “%s” — the “%s” attribute is malformed"),
256 address_entry, "port");
261 if (family != NULL && !(g_strcmp0 (family, "ipv4") == 0 || g_strcmp0 (family, "ipv6") == 0))
265 G_IO_ERROR_INVALID_ARGUMENT,
266 _("Error in address “%s” — the “%s” attribute is malformed"),
267 address_entry, "family");
273 /* TODO: validate host */
276 if (nonce_file != NULL && *nonce_file == '\0')
280 G_IO_ERROR_INVALID_ARGUMENT,
281 _("Error in address “%s” — the “%s” attribute is malformed"),
282 address_entry, "noncefile");
289 g_ptr_array_unref (keys);
295 is_valid_tcp (const gchar *address_entry,
296 GHashTable *key_value_pairs,
312 keys = g_hash_table_get_keys_as_ptr_array (key_value_pairs);
313 for (guint i = 0; i < keys->len; ++i)
315 const gchar *key = g_ptr_array_index (keys, i);
316 if (g_strcmp0 (key, "host") == 0)
317 host = g_hash_table_lookup (key_value_pairs, key);
318 else if (g_strcmp0 (key, "port") == 0)
319 port = g_hash_table_lookup (key_value_pairs, key);
320 else if (g_strcmp0 (key, "family") == 0)
321 family = g_hash_table_lookup (key_value_pairs, key);
322 else if (g_strcmp0 (key, "guid") != 0)
326 G_IO_ERROR_INVALID_ARGUMENT,
327 _("Unsupported key “%s” in address entry “%s”"),
336 port_num = strtol (port, &endp, 10);
337 if ((*port == '\0' || *endp != '\0') || port_num < 0 || port_num >= 65536)
341 G_IO_ERROR_INVALID_ARGUMENT,
342 _("Error in address “%s” — the “%s” attribute is malformed"),
343 address_entry, "port");
348 if (family != NULL && !(g_strcmp0 (family, "ipv4") == 0 || g_strcmp0 (family, "ipv6") == 0))
352 G_IO_ERROR_INVALID_ARGUMENT,
353 _("Error in address “%s” — the “%s” attribute is malformed"),
354 address_entry, "family");
360 /* TODO: validate host */
366 g_ptr_array_unref (keys);
372 * g_dbus_is_supported_address:
374 * @error: Return location for error or %NULL.
376 * Like g_dbus_is_address() but also checks if the library supports the
377 * transports in @string and that key/value pairs for each transport
378 * are valid. See the specification of the
379 * [D-Bus address format](https://dbus.freedesktop.org/doc/dbus-specification.html#addresses).
381 * Returns: %TRUE if @string is a valid D-Bus address that is
382 * supported by this library, %FALSE if @error is set.
387 g_dbus_is_supported_address (const gchar *string,
396 g_return_val_if_fail (string != NULL, FALSE);
397 g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
399 a = g_strsplit (string, ";", 0);
400 for (n = 0; a[n] != NULL; n++)
402 gchar *transport_name;
403 GHashTable *key_value_pairs;
406 if (!_g_dbus_address_parse_entry (a[n],
413 if (g_strcmp0 (transport_name, "unix") == 0)
414 supported = is_valid_unix (a[n], key_value_pairs, error);
415 else if (g_strcmp0 (transport_name, "tcp") == 0)
416 supported = is_valid_tcp (a[n], key_value_pairs, error);
417 else if (g_strcmp0 (transport_name, "nonce-tcp") == 0)
418 supported = is_valid_nonce_tcp (a[n], key_value_pairs, error);
419 else if (g_strcmp0 (a[n], "autolaunch:") == 0)
422 g_set_error (error, G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT,
423 _("Unknown or unsupported transport “%s” for address “%s”"),
424 transport_name, a[n]);
426 g_free (transport_name);
427 g_hash_table_unref (key_value_pairs);
438 g_assert (ret || (!ret && (error == NULL || *error != NULL)));
444 _g_dbus_address_parse_entry (const gchar *address_entry,
445 gchar **out_transport_name,
446 GHashTable **out_key_value_pairs,
450 GHashTable *key_value_pairs;
451 gchar *transport_name;
458 transport_name = NULL;
459 key_value_pairs = NULL;
461 s = strchr (address_entry, ':');
466 G_IO_ERROR_INVALID_ARGUMENT,
467 _("Address element “%s” does not contain a colon (:)"),
471 else if (s == address_entry)
475 G_IO_ERROR_INVALID_ARGUMENT,
476 _("Transport name in address element “%s” must not be empty"),
481 transport_name = g_strndup (address_entry, s - address_entry);
482 key_value_pairs = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, g_free);
484 kv_pairs = g_strsplit (s + 1, ",", 0);
485 for (n = 0; kv_pairs[n] != NULL; n++)
487 const gchar *kv_pair = kv_pairs[n];
491 s = strchr (kv_pair, '=');
496 G_IO_ERROR_INVALID_ARGUMENT,
497 _("Key/Value pair %d, “%s”, in address element “%s” does not contain an equal sign"),
503 else if (s == kv_pair)
507 G_IO_ERROR_INVALID_ARGUMENT,
508 _("Key/Value pair %d, “%s”, in address element “%s” must not have an empty key"),
515 key = g_uri_unescape_segment (kv_pair, s, NULL);
516 value = g_uri_unescape_segment (s + 1, kv_pair + strlen (kv_pair), NULL);
517 if (key == NULL || value == NULL)
521 G_IO_ERROR_INVALID_ARGUMENT,
522 _("Error unescaping key or value in Key/Value pair %d, “%s”, in address element “%s”"),
530 g_hash_table_insert (key_value_pairs, key, value);
538 if (out_transport_name != NULL)
539 *out_transport_name = g_steal_pointer (&transport_name);
540 if (out_key_value_pairs != NULL)
541 *out_key_value_pairs = g_steal_pointer (&key_value_pairs);
544 g_clear_pointer (&key_value_pairs, g_hash_table_unref);
545 g_free (transport_name);
546 g_strfreev (kv_pairs);
551 /* ---------------------------------------------------------------------------------------------------- */
554 g_dbus_address_try_connect_one (const gchar *address_entry,
557 GCancellable *cancellable,
560 /* TODO: Declare an extension point called GDBusTransport (or similar)
561 * and move code below to extensions implementing said extension
562 * point. That way we can implement a D-Bus transport over X11 without
563 * making libgio link to libX11...
566 g_dbus_address_connect (const gchar *address_entry,
567 const gchar *transport_name,
569 GHashTable *key_value_pairs,
570 GCancellable *cancellable,
574 GSocketConnectable *connectable;
575 const gchar *nonce_file;
584 #if defined (G_OS_UNIX) && defined (KDBUS)
585 else if (kdbus_okay && g_str_equal (transport_name, "kernel"))
587 GKDBusWorker *worker;
590 path = g_hash_table_lookup (key_value_pairs, "path");
594 g_set_error (error, G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT,
595 _("Error in address '%s' - the kernel transport requires a path"),
600 worker = _g_kdbus_worker_new (path, error);
605 return G_OBJECT (worker);
609 else if (g_strcmp0 (transport_name, "unix") == 0)
612 const gchar *abstract;
613 path = g_hash_table_lookup (key_value_pairs, "path");
614 abstract = g_hash_table_lookup (key_value_pairs, "abstract");
615 if ((path == NULL && abstract == NULL) || (path != NULL && abstract != NULL))
619 G_IO_ERROR_INVALID_ARGUMENT,
620 _("Error in address “%s” — the unix transport requires exactly one of the "
621 "keys “path” or “abstract” to be set"),
624 else if (path != NULL)
626 connectable = G_SOCKET_CONNECTABLE (g_unix_socket_address_new (path));
628 else if (abstract != NULL)
630 connectable = G_SOCKET_CONNECTABLE (g_unix_socket_address_new_with_type (abstract,
632 G_UNIX_SOCKET_ADDRESS_ABSTRACT));
636 g_assert_not_reached ();
639 else if (g_strcmp0 (transport_name, "tcp") == 0 || g_strcmp0 (transport_name, "nonce-tcp") == 0)
647 is_nonce = (g_strcmp0 (transport_name, "nonce-tcp") == 0);
649 host = g_hash_table_lookup (key_value_pairs, "host");
654 G_IO_ERROR_INVALID_ARGUMENT,
655 _("Error in address “%s” — the host attribute is missing or malformed"),
660 s = g_hash_table_lookup (key_value_pairs, "port");
663 port = strtol (s, &endp, 10);
664 if ((*s == '\0' || *endp != '\0') || port < 0 || port >= 65536)
668 G_IO_ERROR_INVALID_ARGUMENT,
669 _("Error in address “%s” — the port attribute is missing or malformed"),
677 nonce_file = g_hash_table_lookup (key_value_pairs, "noncefile");
678 if (nonce_file == NULL)
682 G_IO_ERROR_INVALID_ARGUMENT,
683 _("Error in address “%s” — the noncefile attribute is missing or malformed"),
689 /* TODO: deal with family key/value-pair */
690 connectable = g_network_address_new (host, port);
692 else if (g_strcmp0 (address_entry, "autolaunch:") == 0)
694 gchar *autolaunch_address;
695 autolaunch_address = get_session_address_dbus_launch (error);
696 if (autolaunch_address != NULL)
698 ret = g_dbus_address_try_connect_one (autolaunch_address, kdbus_okay, NULL, cancellable, error);
699 g_free (autolaunch_address);
704 g_prefix_error (error, _("Error auto-launching: "));
711 G_IO_ERROR_INVALID_ARGUMENT,
712 _("Unknown or unsupported transport “%s” for address “%s”"),
717 if (connectable != NULL)
719 GSocketClient *client;
720 GSocketConnection *connection;
722 g_assert (ret == NULL);
723 client = g_socket_client_new ();
725 /* Disable proxy support to prevent a deadlock on startup, since loading a
726 * proxy resolver causes the GIO modules to be loaded, and there will
727 * almost certainly be one of them which then tries to use GDBus.
728 * See: https://bugzilla.gnome.org/show_bug.cgi?id=792499 */
729 g_socket_client_set_enable_proxy (client, FALSE);
731 connection = g_socket_client_connect (client,
735 g_object_unref (connectable);
736 g_object_unref (client);
737 if (connection == NULL)
740 ret = G_OBJECT (connection);
742 if (nonce_file != NULL)
744 gchar nonce_contents[16 + 1];
745 size_t num_bytes_read;
749 /* be careful to read only 16 bytes - we also check that the file is only 16 bytes long */
750 f = fopen (nonce_file, "rb" FO_CLOEXEC);
756 G_IO_ERROR_INVALID_ARGUMENT,
757 _("Error opening nonce file “%s”: %s"),
760 g_object_unref (ret);
764 num_bytes_read = fread (nonce_contents,
769 if (num_bytes_read != 16)
771 if (num_bytes_read == 0)
775 G_IO_ERROR_INVALID_ARGUMENT,
776 _("Error reading from nonce file “%s”: %s"),
784 G_IO_ERROR_INVALID_ARGUMENT,
785 _("Error reading from nonce file “%s”, expected 16 bytes, got %d"),
787 (gint) num_bytes_read);
789 g_object_unref (ret);
796 if (!g_output_stream_write_all (g_io_stream_get_output_stream (G_IO_STREAM (connection)),
803 g_prefix_error (error, _("Error writing contents of nonce file “%s” to stream:"), nonce_file);
804 g_object_unref (ret);
817 g_dbus_address_try_connect_one (const gchar *address_entry,
820 GCancellable *cancellable,
824 GHashTable *key_value_pairs;
825 gchar *transport_name;
829 transport_name = NULL;
830 key_value_pairs = NULL;
832 if (!_g_dbus_address_parse_entry (address_entry,
838 ret = g_dbus_address_connect (address_entry,
847 guid = g_hash_table_lookup (key_value_pairs, "guid");
848 if (guid != NULL && out_guid != NULL)
849 *out_guid = g_strdup (guid);
852 g_free (transport_name);
853 if (key_value_pairs != NULL)
854 g_hash_table_unref (key_value_pairs);
859 /* ---------------------------------------------------------------------------------------------------- */
867 get_stream_data_free (GetStreamData *data)
869 g_free (data->address);
875 get_stream_thread_func (GTask *task,
876 gpointer source_object,
878 GCancellable *cancellable)
880 GetStreamData *data = task_data;
882 GError *error = NULL;
884 stream = g_dbus_address_get_stream_sync (data->address,
889 g_task_return_pointer (task, stream, g_object_unref);
891 g_task_return_error (task, error);
895 * g_dbus_address_get_stream:
896 * @address: A valid D-Bus address.
897 * @cancellable: (nullable): A #GCancellable or %NULL.
898 * @callback: A #GAsyncReadyCallback to call when the request is satisfied.
899 * @user_data: Data to pass to @callback.
901 * Asynchronously connects to an endpoint specified by @address and
902 * sets up the connection so it is in a state to run the client-side
903 * of the D-Bus authentication conversation. @address must be in the
904 * [D-Bus address format](https://dbus.freedesktop.org/doc/dbus-specification.html#addresses).
906 * When the operation is finished, @callback will be invoked. You can
907 * then call g_dbus_address_get_stream_finish() to get the result of
910 * This is an asynchronous failable function. See
911 * g_dbus_address_get_stream_sync() for the synchronous version.
916 g_dbus_address_get_stream (const gchar *address,
917 GCancellable *cancellable,
918 GAsyncReadyCallback callback,
924 g_return_if_fail (address != NULL);
926 data = g_new0 (GetStreamData, 1);
927 data->address = g_strdup (address);
929 task = g_task_new (NULL, cancellable, callback, user_data);
930 g_task_set_source_tag (task, g_dbus_address_get_stream);
931 g_task_set_task_data (task, data, (GDestroyNotify) get_stream_data_free);
932 g_task_run_in_thread (task, get_stream_thread_func);
933 g_object_unref (task);
937 * g_dbus_address_get_stream_finish:
938 * @res: A #GAsyncResult obtained from the GAsyncReadyCallback passed to g_dbus_address_get_stream().
939 * @out_guid: (optional) (out) (nullable): %NULL or return location to store the GUID extracted from @address, if any.
940 * @error: Return location for error or %NULL.
942 * Finishes an operation started with g_dbus_address_get_stream().
944 * A server is not required to set a GUID, so @out_guid may be set to %NULL
947 * Returns: (transfer full): A #GIOStream or %NULL if @error is set.
952 g_dbus_address_get_stream_finish (GAsyncResult *res,
960 g_return_val_if_fail (g_task_is_valid (res, NULL), NULL);
961 g_return_val_if_fail (error == NULL || *error == NULL, NULL);
964 ret = g_task_propagate_pointer (task, error);
966 if (ret != NULL && out_guid != NULL)
968 data = g_task_get_task_data (task);
969 *out_guid = data->guid;
977 * g_dbus_address_get_stream_sync:
978 * @address: A valid D-Bus address.
979 * @out_guid: (optional) (out) (nullable): %NULL or return location to store the GUID extracted from @address, if any.
980 * @cancellable: (nullable): A #GCancellable or %NULL.
981 * @error: Return location for error or %NULL.
983 * Synchronously connects to an endpoint specified by @address and
984 * sets up the connection so it is in a state to run the client-side
985 * of the D-Bus authentication conversation. @address must be in the
986 * [D-Bus address format](https://dbus.freedesktop.org/doc/dbus-specification.html#addresses).
988 * A server is not required to set a GUID, so @out_guid may be set to %NULL
991 * This is a synchronous failable function. See
992 * g_dbus_address_get_stream() for the asynchronous version.
994 * Returns: (transfer full): A #GIOStream or %NULL if @error is set.
999 g_dbus_address_get_stream_sync (const gchar *address,
1001 GCancellable *cancellable,
1006 result = g_dbus_address_get_stream_internal (address, FALSE, out_guid, cancellable, error);
1007 g_assert (result == NULL || G_IS_IO_STREAM (result));
1010 return G_IO_STREAM (result);
1016 g_dbus_address_get_stream_internal (const gchar *address,
1017 gboolean kdbus_okay,
1019 GCancellable *cancellable,
1027 g_return_val_if_fail (address != NULL, NULL);
1028 g_return_val_if_fail (error == NULL || *error == NULL, NULL);
1033 addr_array = g_strsplit (address, ";", 0);
1034 if (addr_array[0] == NULL)
1036 last_error = g_error_new_literal (G_IO_ERROR,
1037 G_IO_ERROR_INVALID_ARGUMENT,
1038 _("The given address is empty"));
1042 for (n = 0; addr_array[n] != NULL; n++)
1044 const gchar *addr = addr_array[n];
1048 ret = g_dbus_address_try_connect_one (addr,
1059 g_assert (this_error != NULL);
1060 if (last_error != NULL)
1061 g_error_free (last_error);
1062 last_error = this_error;
1069 if (last_error != NULL)
1070 g_error_free (last_error);
1074 g_assert (last_error != NULL);
1075 g_propagate_error (error, last_error);
1078 g_strfreev (addr_array);
1082 /* ---------------------------------------------------------------------------------------------------- */
1085 * Return the address of XDG_RUNTIME_DIR/bus if it exists, belongs to
1086 * us, and is a socket, and we are on Unix.
1089 get_session_address_xdg (void)
1097 bus = g_build_filename (g_get_user_runtime_dir (), "bus", NULL);
1099 /* if ENOENT, EPERM, etc., quietly don't use it */
1100 if (g_stat (bus, &buf) < 0)
1103 /* if it isn't ours, we have incorrectly inherited someone else's
1104 * XDG_RUNTIME_DIR; silently don't use it
1106 if (buf.st_uid != geteuid ())
1109 /* if it isn't a socket, silently don't use it */
1110 if ((buf.st_mode & S_IFMT) != S_IFSOCK)
1113 tmp = g_dbus_address_escape_value (bus);
1114 ret = g_strconcat ("unix:path=", tmp, NULL);
1126 get_session_address_kdbus (void)
1133 bus = g_strdup_printf ("/sys/fs/kdbus/%d-user/bus", getuid());
1135 /* if ENOENT, EPERM, etc., quietly don't use it */
1136 if (g_stat (bus, &buf) < 0)
1139 ret = g_strconcat ("kernel:path=", bus, NULL);
1149 /* ---------------------------------------------------------------------------------------------------- */
1153 get_session_address_dbus_launch (GError **error)
1157 gchar *command_line;
1158 gchar *launch_stdout;
1159 gchar *launch_stderr;
1161 gchar *old_dbus_verbose;
1162 gboolean restore_dbus_verbose;
1166 command_line = NULL;
1167 launch_stdout = NULL;
1168 launch_stderr = NULL;
1169 restore_dbus_verbose = FALSE;
1170 old_dbus_verbose = NULL;
1172 /* Don't run binaries as root if we're setuid. */
1173 if (GLIB_PRIVATE_CALL (g_check_setuid) ())
1175 g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
1176 _("Cannot spawn a message bus when AT_SECURE is set"));
1180 machine_id = _g_dbus_get_machine_id (error);
1181 if (machine_id == NULL)
1183 g_prefix_error (error, _("Cannot spawn a message bus without a machine-id: "));
1187 if (g_getenv ("DISPLAY") == NULL)
1189 g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
1190 _("Cannot autolaunch D-Bus without X11 $DISPLAY"));
1194 /* We're using private libdbus facilities here. When everything
1195 * (X11, Mac OS X, Windows) is spec'ed out correctly (not even the
1196 * X11 property is correctly documented right now) we should
1197 * consider using the spec instead of dbus-launch.
1199 * --autolaunch=MACHINEID
1200 * This option implies that dbus-launch should scan for a previ‐
1201 * ously-started session and reuse the values found there. If no
1202 * session is found, it will start a new session. The --exit-with-
1203 * session option is implied if --autolaunch is given. This option
1204 * is for the exclusive use of libdbus, you do not want to use it
1205 * manually. It may change in the future.
1208 /* TODO: maybe provide a variable for where to look for the dbus-launch binary? */
1209 command_line = g_strdup_printf ("dbus-launch --autolaunch=%s --binary-syntax --close-stderr", machine_id);
1211 if (G_UNLIKELY (_g_dbus_debug_address ()))
1213 _g_dbus_debug_print_lock ();
1214 g_print ("GDBus-debug:Address: Running '%s' to get bus address (possibly autolaunching)\n", command_line);
1215 old_dbus_verbose = g_strdup (g_getenv ("DBUS_VERBOSE"));
1216 restore_dbus_verbose = TRUE;
1217 g_setenv ("DBUS_VERBOSE", "1", TRUE);
1218 _g_dbus_debug_print_unlock ();
1221 if (!g_spawn_command_line_sync (command_line,
1230 if (!g_spawn_check_wait_status (wait_status, error))
1232 g_prefix_error (error, _("Error spawning command line “%s”: "), command_line);
1236 /* From the dbus-launch(1) man page:
1238 * --binary-syntax Write to stdout a nul-terminated bus address,
1239 * then the bus PID as a binary integer of size sizeof(pid_t),
1240 * then the bus X window ID as a binary integer of size
1241 * sizeof(long). Integers are in the machine's byte order, not
1242 * network byte order or any other canonical byte order.
1244 ret = g_strdup (launch_stdout);
1247 if (G_UNLIKELY (_g_dbus_debug_address ()))
1250 _g_dbus_debug_print_lock ();
1251 g_print ("GDBus-debug:Address: dbus-launch output:");
1252 if (launch_stdout != NULL)
1254 s = _g_dbus_hexdump (launch_stdout, strlen (launch_stdout) + 1 + sizeof (pid_t) + sizeof (long), 2);
1255 g_print ("\n%s", s);
1260 g_print (" (none)\n");
1262 g_print ("GDBus-debug:Address: dbus-launch stderr output:");
1263 if (launch_stderr != NULL)
1264 g_print ("\n%s", launch_stderr);
1266 g_print (" (none)\n");
1267 _g_dbus_debug_print_unlock ();
1270 g_free (machine_id);
1271 g_free (command_line);
1272 g_free (launch_stdout);
1273 g_free (launch_stderr);
1274 if (G_UNLIKELY (restore_dbus_verbose))
1276 if (old_dbus_verbose != NULL)
1277 g_setenv ("DBUS_VERBOSE", old_dbus_verbose, TRUE);
1279 g_unsetenv ("DBUS_VERBOSE");
1281 g_free (old_dbus_verbose);
1285 /* end of G_OS_UNIX case */
1286 #elif defined(G_OS_WIN32)
1289 get_session_address_dbus_launch (GError **error)
1291 return _g_dbus_win32_get_session_address_dbus_launch (error);
1294 #else /* neither G_OS_UNIX nor G_OS_WIN32 */
1296 get_session_address_dbus_launch (GError **error)
1301 _("Cannot determine session bus address (not implemented for this OS)"));
1304 #endif /* neither G_OS_UNIX nor G_OS_WIN32 */
1306 /* ---------------------------------------------------------------------------------------------------- */
1309 get_session_address_platform_specific (GError **error)
1313 /* Use XDG_RUNTIME_DIR/bus if it exists and is suitable. This is appropriate
1314 * for systems using the "a session is a user-session" model described in
1315 * <http://lists.freedesktop.org/archives/dbus/2015-January/016522.html>,
1316 * and implemented in dbus >= 1.9.14 and sd-bus.
1318 * On systems following the more traditional "a session is a login-session"
1319 * model, this will fail and we'll fall through to X11 autolaunching
1320 * (dbus-launch) below.
1322 ret = get_session_address_xdg ();
1327 /* TODO (#694472): try launchd on OS X, like
1328 * _dbus_lookup_session_address_launchd() does, since
1329 * 'dbus-launch --autolaunch' probably won't work there
1332 /* As a last resort, try the "autolaunch:" transport. On Unix this means
1333 * X11 autolaunching; on Windows this means a different autolaunching
1334 * mechanism based on shared memory.
1336 return get_session_address_dbus_launch (error);
1339 /* ---------------------------------------------------------------------------------------------------- */
1342 * g_dbus_address_get_for_bus_sync:
1343 * @bus_type: a #GBusType
1344 * @cancellable: (nullable): a #GCancellable or %NULL
1345 * @error: return location for error or %NULL
1347 * Synchronously looks up the D-Bus address for the well-known message
1348 * bus instance specified by @bus_type. This may involve using various
1349 * platform specific mechanisms.
1351 * The returned address will be in the
1352 * [D-Bus address format](https://dbus.freedesktop.org/doc/dbus-specification.html#addresses).
1354 * Returns: (transfer full): a valid D-Bus address string for @bus_type or
1355 * %NULL if @error is set
1360 g_dbus_address_get_for_bus_sync (GBusType bus_type,
1361 GCancellable *cancellable,
1364 gboolean has_elevated_privileges = GLIB_PRIVATE_CALL (g_check_setuid) ();
1365 gchar *ret, *s = NULL;
1366 const gchar *starter_bus;
1367 GError *local_error;
1369 g_return_val_if_fail (error == NULL || *error == NULL, NULL);
1374 if (G_UNLIKELY (_g_dbus_debug_address ()))
1378 _g_dbus_debug_print_lock ();
1379 s = _g_dbus_enum_to_string (G_TYPE_BUS_TYPE, bus_type);
1380 g_print ("GDBus-debug:Address: In g_dbus_address_get_for_bus_sync() for bus type '%s'\n",
1383 for (n = 0; n < 3; n++)
1389 case 0: k = "DBUS_SESSION_BUS_ADDRESS"; break;
1390 case 1: k = "DBUS_SYSTEM_BUS_ADDRESS"; break;
1391 case 2: k = "DBUS_STARTER_BUS_TYPE"; break;
1392 default: g_assert_not_reached ();
1395 g_print ("GDBus-debug:Address: env var %s", k);
1397 g_print ("='%s'\n", v);
1399 g_print (" is not set\n");
1401 _g_dbus_debug_print_unlock ();
1404 /* Don’t load the addresses from the environment if running as setuid, as they
1405 * come from an unprivileged caller. */
1408 case G_BUS_TYPE_SYSTEM:
1409 if (has_elevated_privileges)
1412 ret = g_strdup (g_getenv ("DBUS_SYSTEM_BUS_ADDRESS"));
1416 /* While the D-Bus specification says this must be `/var/run/dbus/system_bus_socket`,
1417 * a footnote allows it to use localstatedir:
1418 * https://dbus.freedesktop.org/doc/dbus-specification.html#ftn.id-1.13.6.4.3.3
1419 * or, on systems where /run is the same as /var/run, runstatedir:
1420 * https://gitlab.freedesktop.org/dbus/dbus/-/merge_requests/209 */
1421 ret = g_strdup ("kernel:path=/sys/fs/kdbus/0-system/bus;unix:path=" GLIB_RUNSTATEDIR "/dbus/system_bus_socket");
1425 case G_BUS_TYPE_SESSION:
1426 if (has_elevated_privileges)
1429 ret = g_strdup (g_getenv ("DBUS_SESSION_BUS_ADDRESS"));
1433 ret = get_session_address_kdbus ();
1435 ret = get_session_address_platform_specific (&local_error);
1441 case G_BUS_TYPE_STARTER:
1442 starter_bus = g_getenv ("DBUS_STARTER_BUS_TYPE");
1443 if (g_strcmp0 (starter_bus, "session") == 0)
1445 ret = g_dbus_address_get_for_bus_sync (G_BUS_TYPE_SESSION, cancellable, &local_error);
1448 else if (g_strcmp0 (starter_bus, "system") == 0)
1450 ret = g_dbus_address_get_for_bus_sync (G_BUS_TYPE_SYSTEM, cancellable, &local_error);
1455 if (starter_bus != NULL)
1457 g_set_error (&local_error,
1460 _("Cannot determine bus address from DBUS_STARTER_BUS_TYPE environment variable"
1461 " — unknown value “%s”"),
1466 g_set_error_literal (&local_error,
1469 _("Cannot determine bus address because the DBUS_STARTER_BUS_TYPE environment "
1470 "variable is not set"));
1476 g_set_error (&local_error,
1479 _("Unknown bus type %d"),
1485 if (G_UNLIKELY (_g_dbus_debug_address ()))
1487 _g_dbus_debug_print_lock ();
1488 s = _g_dbus_enum_to_string (G_TYPE_BUS_TYPE, bus_type);
1491 g_print ("GDBus-debug:Address: Returning address '%s' for bus type '%s'\n",
1496 g_print ("GDBus-debug:Address: Cannot look-up address bus type '%s': %s\n",
1497 s, local_error ? local_error->message : "");
1500 _g_dbus_debug_print_unlock ();
1503 if (local_error != NULL)
1504 g_propagate_error (error, local_error);
1510 * g_dbus_address_escape_value:
1511 * @string: an unescaped string to be included in a D-Bus address
1512 * as the value in a key-value pair
1514 * Escape @string so it can appear in a D-Bus address as the value
1515 * part of a key-value pair.
1517 * For instance, if @string is `/run/bus-for-:0`,
1518 * this function would return `/run/bus-for-%3A0`,
1519 * which could be used in a D-Bus address like
1520 * `unix:nonce-tcp:host=127.0.0.1,port=42,noncefile=/run/bus-for-%3A0`.
1522 * Returns: (transfer full): a copy of @string with all
1523 * non-optionally-escaped bytes escaped
1528 g_dbus_address_escape_value (const gchar *string)
1533 g_return_val_if_fail (string != NULL, NULL);
1535 /* There will often not be anything needing escaping at all. */
1536 s = g_string_sized_new (strlen (string));
1538 /* D-Bus address escaping is mostly the same as URI escaping... */
1539 g_string_append_uri_escaped (s, string, "\\/", FALSE);
1541 /* ... but '~' is an unreserved character in URIs, but a
1542 * non-optionally-escaped character in D-Bus addresses. */
1543 for (i = 0; i < s->len; i++)
1545 if (G_UNLIKELY (s->str[i] == '~'))
1548 g_string_insert (s, i + 1, "7E");
1553 return g_string_free (s, FALSE);