1 /* GDBus - GLib D-Bus Library
2 *
3 * Copyright (C) 2008-2010 Red Hat, Inc.
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2.1 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
14 *
15 * You should have received a copy of the GNU Lesser General
16 * Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
17 *
18 * Author: David Zeuthen <davidz@redhat.com>
19 */
20
21 #include "config.h"
22
23 #include <stdlib.h>
24 #include <string.h>
25 #include <stdio.h>
26 #include <errno.h>
27
28 #include "gioerror.h"
29 #include "gdbusutils.h"
30 #include "gdbusaddress.h"
31 #include "gdbuserror.h"
32 #include "gioenumtypes.h"
33 #include "glib-private.h"
34 #include "gnetworkaddress.h"
35 #include "gsocketclient.h"
36 #include "giostream.h"
37 #include "gasyncresult.h"
38 #include "gtask.h"
39 #include "glib-private.h"
40 #include "gdbusprivate.h"
41 #include "gstdio.h"
42
43 #ifdef G_OS_UNIX
44 #include <unistd.h>
45 #include <sys/stat.h>
46 #include <sys/types.h>
47 #include <gio/gunixsocketaddress.h>
48 #endif
49
50 #ifdef G_OS_WIN32
51 #include <windows.h>
52 #endif
53
54 #include "glibintl.h"
55
56 /**
57 * SECTION:gdbusaddress
58 * @title: D-Bus Addresses
59 * @short_description: D-Bus connection endpoints
60 * @include: gio/gio.h
61 *
62 * Routines for working with D-Bus addresses. A D-Bus address is a string
63 * like `unix:tmpdir=/tmp/my-app-name`. The exact format of addresses
64 * is explained in detail in the
65 * [D-Bus specification](http://dbus.freedesktop.org/doc/dbus-specification.html#addresses).
66 *
67 * TCP D-Bus connections are supported, but accessing them via a proxy is
68 * currently not supported.
69 */
70
71 static gchar *get_session_address_platform_specific (GError **error);
72 static gchar *get_session_address_dbus_launch (GError **error);
73
74 /* ---------------------------------------------------------------------------------------------------- */
75
76 /**
77 * g_dbus_is_address:
78 * @string: A string.
79 *
80 * Checks if @string is a
81 * [D-Bus address](https://dbus.freedesktop.org/doc/dbus-specification.html#addresses).
82 *
83 * This doesn't check if @string is actually supported by #GDBusServer
84 * or #GDBusConnection - use g_dbus_is_supported_address() to do more
85 * checks.
86 *
87 * Returns: %TRUE if @string is a valid D-Bus address, %FALSE otherwise.
88 *
89 * Since: 2.26
90 */
91 gboolean
g_dbus_is_address(const gchar * string)92 g_dbus_is_address (const gchar *string)
93 {
94 guint n;
95 gchar **a;
96 gboolean ret;
97
98 ret = FALSE;
99
100 g_return_val_if_fail (string != NULL, FALSE);
101
102 a = g_strsplit (string, ";", 0);
103 if (a[0] == NULL)
104 goto out;
105
106 for (n = 0; a[n] != NULL; n++)
107 {
108 if (!_g_dbus_address_parse_entry (a[n],
109 NULL,
110 NULL,
111 NULL))
112 goto out;
113 }
114
115 ret = TRUE;
116
117 out:
118 g_strfreev (a);
119 return ret;
120 }
121
122 static gboolean
is_valid_unix(const gchar * address_entry,GHashTable * key_value_pairs,GError ** error)123 is_valid_unix (const gchar *address_entry,
124 GHashTable *key_value_pairs,
125 GError **error)
126 {
127 gboolean ret;
128 GList *keys;
129 GList *l;
130 const gchar *path;
131 const gchar *dir;
132 const gchar *tmpdir;
133 const gchar *abstract;
134
135 ret = FALSE;
136 keys = NULL;
137 path = NULL;
138 dir = NULL;
139 tmpdir = NULL;
140 abstract = NULL;
141
142 keys = g_hash_table_get_keys (key_value_pairs);
143 for (l = keys; l != NULL; l = l->next)
144 {
145 const gchar *key = l->data;
146 if (g_strcmp0 (key, "path") == 0)
147 path = g_hash_table_lookup (key_value_pairs, key);
148 else if (g_strcmp0 (key, "dir") == 0)
149 dir = g_hash_table_lookup (key_value_pairs, key);
150 else if (g_strcmp0 (key, "tmpdir") == 0)
151 tmpdir = g_hash_table_lookup (key_value_pairs, key);
152 else if (g_strcmp0 (key, "abstract") == 0)
153 abstract = g_hash_table_lookup (key_value_pairs, key);
154 else if (g_strcmp0 (key, "guid") != 0)
155 {
156 g_set_error (error,
157 G_IO_ERROR,
158 G_IO_ERROR_INVALID_ARGUMENT,
159 _("Unsupported key “%s” in address entry “%s”"),
160 key,
161 address_entry);
162 goto out;
163 }
164 }
165
166 /* Exactly one key must be set */
167 if ((path != NULL) + (dir != NULL) + (tmpdir != NULL) + (abstract != NULL) > 1)
168 {
169 g_set_error (error,
170 G_IO_ERROR,
171 G_IO_ERROR_INVALID_ARGUMENT,
172 _("Meaningless key/value pair combination in address entry “%s”"),
173 address_entry);
174 goto out;
175 }
176 else if (path == NULL && dir == NULL && tmpdir == NULL && abstract == NULL)
177 {
178 g_set_error (error,
179 G_IO_ERROR,
180 G_IO_ERROR_INVALID_ARGUMENT,
181 _("Address “%s” is invalid (need exactly one of path, dir, tmpdir, or abstract keys)"),
182 address_entry);
183 goto out;
184 }
185
186 ret = TRUE;
187
188 out:
189 g_list_free (keys);
190
191 return ret;
192 }
193
194 static gboolean
is_valid_nonce_tcp(const gchar * address_entry,GHashTable * key_value_pairs,GError ** error)195 is_valid_nonce_tcp (const gchar *address_entry,
196 GHashTable *key_value_pairs,
197 GError **error)
198 {
199 gboolean ret;
200 GList *keys;
201 GList *l;
202 const gchar *host;
203 const gchar *port;
204 const gchar *family;
205 const gchar *nonce_file;
206 gint port_num;
207 gchar *endp;
208
209 ret = FALSE;
210 keys = NULL;
211 host = NULL;
212 port = NULL;
213 family = NULL;
214 nonce_file = NULL;
215
216 keys = g_hash_table_get_keys (key_value_pairs);
217 for (l = keys; l != NULL; l = l->next)
218 {
219 const gchar *key = l->data;
220 if (g_strcmp0 (key, "host") == 0)
221 host = g_hash_table_lookup (key_value_pairs, key);
222 else if (g_strcmp0 (key, "port") == 0)
223 port = g_hash_table_lookup (key_value_pairs, key);
224 else if (g_strcmp0 (key, "family") == 0)
225 family = g_hash_table_lookup (key_value_pairs, key);
226 else if (g_strcmp0 (key, "noncefile") == 0)
227 nonce_file = g_hash_table_lookup (key_value_pairs, key);
228 else if (g_strcmp0 (key, "guid") != 0)
229 {
230 g_set_error (error,
231 G_IO_ERROR,
232 G_IO_ERROR_INVALID_ARGUMENT,
233 _("Unsupported key “%s” in address entry “%s”"),
234 key,
235 address_entry);
236 goto out;
237 }
238 }
239
240 if (port != NULL)
241 {
242 port_num = strtol (port, &endp, 10);
243 if ((*port == '\0' || *endp != '\0') || port_num < 0 || port_num >= 65536)
244 {
245 g_set_error (error,
246 G_IO_ERROR,
247 G_IO_ERROR_INVALID_ARGUMENT,
248 _("Error in address “%s” — the “%s” attribute is malformed"),
249 address_entry, "port");
250 goto out;
251 }
252 }
253
254 if (family != NULL && !(g_strcmp0 (family, "ipv4") == 0 || g_strcmp0 (family, "ipv6") == 0))
255 {
256 g_set_error (error,
257 G_IO_ERROR,
258 G_IO_ERROR_INVALID_ARGUMENT,
259 _("Error in address “%s” — the “%s” attribute is malformed"),
260 address_entry, "family");
261 goto out;
262 }
263
264 if (host != NULL)
265 {
266 /* TODO: validate host */
267 }
268
269 if (nonce_file != NULL && *nonce_file == '\0')
270 {
271 g_set_error (error,
272 G_IO_ERROR,
273 G_IO_ERROR_INVALID_ARGUMENT,
274 _("Error in address “%s” — the “%s” attribute is malformed"),
275 address_entry, "noncefile");
276 goto out;
277 }
278
279 ret = TRUE;
280
281 out:
282 g_list_free (keys);
283
284 return ret;
285 }
286
287 static gboolean
is_valid_tcp(const gchar * address_entry,GHashTable * key_value_pairs,GError ** error)288 is_valid_tcp (const gchar *address_entry,
289 GHashTable *key_value_pairs,
290 GError **error)
291 {
292 gboolean ret;
293 GList *keys;
294 GList *l;
295 const gchar *host;
296 const gchar *port;
297 const gchar *family;
298 gint port_num;
299 gchar *endp;
300
301 ret = FALSE;
302 keys = NULL;
303 host = NULL;
304 port = NULL;
305 family = NULL;
306
307 keys = g_hash_table_get_keys (key_value_pairs);
308 for (l = keys; l != NULL; l = l->next)
309 {
310 const gchar *key = l->data;
311 if (g_strcmp0 (key, "host") == 0)
312 host = g_hash_table_lookup (key_value_pairs, key);
313 else if (g_strcmp0 (key, "port") == 0)
314 port = g_hash_table_lookup (key_value_pairs, key);
315 else if (g_strcmp0 (key, "family") == 0)
316 family = g_hash_table_lookup (key_value_pairs, key);
317 else if (g_strcmp0 (key, "guid") != 0)
318 {
319 g_set_error (error,
320 G_IO_ERROR,
321 G_IO_ERROR_INVALID_ARGUMENT,
322 _("Unsupported key “%s” in address entry “%s”"),
323 key,
324 address_entry);
325 goto out;
326 }
327 }
328
329 if (port != NULL)
330 {
331 port_num = strtol (port, &endp, 10);
332 if ((*port == '\0' || *endp != '\0') || port_num < 0 || port_num >= 65536)
333 {
334 g_set_error (error,
335 G_IO_ERROR,
336 G_IO_ERROR_INVALID_ARGUMENT,
337 _("Error in address “%s” — the “%s” attribute is malformed"),
338 address_entry, "port");
339 goto out;
340 }
341 }
342
343 if (family != NULL && !(g_strcmp0 (family, "ipv4") == 0 || g_strcmp0 (family, "ipv6") == 0))
344 {
345 g_set_error (error,
346 G_IO_ERROR,
347 G_IO_ERROR_INVALID_ARGUMENT,
348 _("Error in address “%s” — the “%s” attribute is malformed"),
349 address_entry, "family");
350 goto out;
351 }
352
353 if (host != NULL)
354 {
355 /* TODO: validate host */
356 }
357
358 ret= TRUE;
359
360 out:
361 g_list_free (keys);
362
363 return ret;
364 }
365
366 /**
367 * g_dbus_is_supported_address:
368 * @string: A string.
369 * @error: Return location for error or %NULL.
370 *
371 * Like g_dbus_is_address() but also checks if the library supports the
372 * transports in @string and that key/value pairs for each transport
373 * are valid. See the specification of the
374 * [D-Bus address format](https://dbus.freedesktop.org/doc/dbus-specification.html#addresses).
375 *
376 * Returns: %TRUE if @string is a valid D-Bus address that is
377 * supported by this library, %FALSE if @error is set.
378 *
379 * Since: 2.26
380 */
381 gboolean
g_dbus_is_supported_address(const gchar * string,GError ** error)382 g_dbus_is_supported_address (const gchar *string,
383 GError **error)
384 {
385 guint n;
386 gchar **a;
387 gboolean ret;
388
389 ret = FALSE;
390
391 g_return_val_if_fail (string != NULL, FALSE);
392 g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
393
394 a = g_strsplit (string, ";", 0);
395 for (n = 0; a[n] != NULL; n++)
396 {
397 gchar *transport_name;
398 GHashTable *key_value_pairs;
399 gboolean supported;
400
401 if (!_g_dbus_address_parse_entry (a[n],
402 &transport_name,
403 &key_value_pairs,
404 error))
405 goto out;
406
407 supported = FALSE;
408 if (g_strcmp0 (transport_name, "unix") == 0)
409 supported = is_valid_unix (a[n], key_value_pairs, error);
410 else if (g_strcmp0 (transport_name, "tcp") == 0)
411 supported = is_valid_tcp (a[n], key_value_pairs, error);
412 else if (g_strcmp0 (transport_name, "nonce-tcp") == 0)
413 supported = is_valid_nonce_tcp (a[n], key_value_pairs, error);
414 else if (g_strcmp0 (a[n], "autolaunch:") == 0)
415 supported = TRUE;
416 else
417 g_set_error (error, G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT,
418 _("Unknown or unsupported transport “%s” for address “%s”"),
419 transport_name, a[n]);
420
421 g_free (transport_name);
422 g_hash_table_unref (key_value_pairs);
423
424 if (!supported)
425 goto out;
426 }
427
428 ret = TRUE;
429
430 out:
431 g_strfreev (a);
432
433 g_assert (ret || (!ret && (error == NULL || *error != NULL)));
434
435 return ret;
436 }
437
438 gboolean
_g_dbus_address_parse_entry(const gchar * address_entry,gchar ** out_transport_name,GHashTable ** out_key_value_pairs,GError ** error)439 _g_dbus_address_parse_entry (const gchar *address_entry,
440 gchar **out_transport_name,
441 GHashTable **out_key_value_pairs,
442 GError **error)
443 {
444 gboolean ret;
445 GHashTable *key_value_pairs;
446 gchar *transport_name;
447 gchar **kv_pairs;
448 const gchar *s;
449 guint n;
450
451 ret = FALSE;
452 kv_pairs = NULL;
453 transport_name = NULL;
454 key_value_pairs = NULL;
455
456 s = strchr (address_entry, ':');
457 if (s == NULL)
458 {
459 g_set_error (error,
460 G_IO_ERROR,
461 G_IO_ERROR_INVALID_ARGUMENT,
462 _("Address element “%s” does not contain a colon (:)"),
463 address_entry);
464 goto out;
465 }
466 else if (s == address_entry)
467 {
468 g_set_error (error,
469 G_IO_ERROR,
470 G_IO_ERROR_INVALID_ARGUMENT,
471 _("Transport name in address element “%s” must not be empty"),
472 address_entry);
473 goto out;
474 }
475
476 transport_name = g_strndup (address_entry, s - address_entry);
477 key_value_pairs = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, g_free);
478
479 kv_pairs = g_strsplit (s + 1, ",", 0);
480 for (n = 0; kv_pairs[n] != NULL; n++)
481 {
482 const gchar *kv_pair = kv_pairs[n];
483 gchar *key;
484 gchar *value;
485
486 s = strchr (kv_pair, '=');
487 if (s == NULL)
488 {
489 g_set_error (error,
490 G_IO_ERROR,
491 G_IO_ERROR_INVALID_ARGUMENT,
492 _("Key/Value pair %d, “%s”, in address element “%s” does not contain an equal sign"),
493 n,
494 kv_pair,
495 address_entry);
496 goto out;
497 }
498 else if (s == kv_pair)
499 {
500 g_set_error (error,
501 G_IO_ERROR,
502 G_IO_ERROR_INVALID_ARGUMENT,
503 _("Key/Value pair %d, “%s”, in address element “%s” must not have an empty key"),
504 n,
505 kv_pair,
506 address_entry);
507 goto out;
508 }
509
510 key = g_uri_unescape_segment (kv_pair, s, NULL);
511 value = g_uri_unescape_segment (s + 1, kv_pair + strlen (kv_pair), NULL);
512 if (key == NULL || value == NULL)
513 {
514 g_set_error (error,
515 G_IO_ERROR,
516 G_IO_ERROR_INVALID_ARGUMENT,
517 _("Error unescaping key or value in Key/Value pair %d, “%s”, in address element “%s”"),
518 n,
519 kv_pair,
520 address_entry);
521 g_free (key);
522 g_free (value);
523 goto out;
524 }
525 g_hash_table_insert (key_value_pairs, key, value);
526 }
527
528 ret = TRUE;
529
530 out:
531 if (ret)
532 {
533 if (out_transport_name != NULL)
534 *out_transport_name = g_steal_pointer (&transport_name);
535 if (out_key_value_pairs != NULL)
536 *out_key_value_pairs = g_steal_pointer (&key_value_pairs);
537 }
538
539 g_clear_pointer (&key_value_pairs, g_hash_table_unref);
540 g_free (transport_name);
541 g_strfreev (kv_pairs);
542
543 return ret;
544 }
545
546 /* ---------------------------------------------------------------------------------------------------- */
547
548 static GIOStream *
549 g_dbus_address_try_connect_one (const gchar *address_entry,
550 gchar **out_guid,
551 GCancellable *cancellable,
552 GError **error);
553
554 /* TODO: Declare an extension point called GDBusTransport (or similar)
555 * and move code below to extensions implementing said extension
556 * point. That way we can implement a D-Bus transport over X11 without
557 * making libgio link to libX11...
558 */
559 static GIOStream *
g_dbus_address_connect(const gchar * address_entry,const gchar * transport_name,GHashTable * key_value_pairs,GCancellable * cancellable,GError ** error)560 g_dbus_address_connect (const gchar *address_entry,
561 const gchar *transport_name,
562 GHashTable *key_value_pairs,
563 GCancellable *cancellable,
564 GError **error)
565 {
566 GIOStream *ret;
567 GSocketConnectable *connectable;
568 const gchar *nonce_file;
569
570 connectable = NULL;
571 ret = NULL;
572 nonce_file = NULL;
573
574 if (FALSE)
575 {
576 }
577 #ifdef G_OS_UNIX
578 else if (g_strcmp0 (transport_name, "unix") == 0)
579 {
580 const gchar *path;
581 const gchar *abstract;
582 path = g_hash_table_lookup (key_value_pairs, "path");
583 abstract = g_hash_table_lookup (key_value_pairs, "abstract");
584 if ((path == NULL && abstract == NULL) || (path != NULL && abstract != NULL))
585 {
586 g_set_error (error,
587 G_IO_ERROR,
588 G_IO_ERROR_INVALID_ARGUMENT,
589 _("Error in address “%s” — the unix transport requires exactly one of the "
590 "keys “path” or “abstract” to be set"),
591 address_entry);
592 }
593 else if (path != NULL)
594 {
595 connectable = G_SOCKET_CONNECTABLE (g_unix_socket_address_new (path));
596 }
597 else if (abstract != NULL)
598 {
599 connectable = G_SOCKET_CONNECTABLE (g_unix_socket_address_new_with_type (abstract,
600 -1,
601 G_UNIX_SOCKET_ADDRESS_ABSTRACT));
602 }
603 else
604 {
605 g_assert_not_reached ();
606 }
607 }
608 #endif
609 else if (g_strcmp0 (transport_name, "tcp") == 0 || g_strcmp0 (transport_name, "nonce-tcp") == 0)
610 {
611 const gchar *s;
612 const gchar *host;
613 glong port;
614 gchar *endp;
615 gboolean is_nonce;
616
617 is_nonce = (g_strcmp0 (transport_name, "nonce-tcp") == 0);
618
619 host = g_hash_table_lookup (key_value_pairs, "host");
620 if (host == NULL)
621 {
622 g_set_error (error,
623 G_IO_ERROR,
624 G_IO_ERROR_INVALID_ARGUMENT,
625 _("Error in address “%s” — the host attribute is missing or malformed"),
626 address_entry);
627 goto out;
628 }
629
630 s = g_hash_table_lookup (key_value_pairs, "port");
631 if (s == NULL)
632 s = "0";
633 port = strtol (s, &endp, 10);
634 if ((*s == '\0' || *endp != '\0') || port < 0 || port >= 65536)
635 {
636 g_set_error (error,
637 G_IO_ERROR,
638 G_IO_ERROR_INVALID_ARGUMENT,
639 _("Error in address “%s” — the port attribute is missing or malformed"),
640 address_entry);
641 goto out;
642 }
643
644
645 if (is_nonce)
646 {
647 nonce_file = g_hash_table_lookup (key_value_pairs, "noncefile");
648 if (nonce_file == NULL)
649 {
650 g_set_error (error,
651 G_IO_ERROR,
652 G_IO_ERROR_INVALID_ARGUMENT,
653 _("Error in address “%s” — the noncefile attribute is missing or malformed"),
654 address_entry);
655 goto out;
656 }
657 }
658
659 /* TODO: deal with family key/value-pair */
660 connectable = g_network_address_new (host, port);
661 }
662 else if (g_strcmp0 (address_entry, "autolaunch:") == 0)
663 {
664 gchar *autolaunch_address;
665 autolaunch_address = get_session_address_dbus_launch (error);
666 if (autolaunch_address != NULL)
667 {
668 ret = g_dbus_address_try_connect_one (autolaunch_address, NULL, cancellable, error);
669 g_free (autolaunch_address);
670 goto out;
671 }
672 else
673 {
674 g_prefix_error (error, _("Error auto-launching: "));
675 }
676 }
677 else
678 {
679 g_set_error (error,
680 G_IO_ERROR,
681 G_IO_ERROR_INVALID_ARGUMENT,
682 _("Unknown or unsupported transport “%s” for address “%s”"),
683 transport_name,
684 address_entry);
685 }
686
687 if (connectable != NULL)
688 {
689 GSocketClient *client;
690 GSocketConnection *connection;
691
692 g_assert (ret == NULL);
693 client = g_socket_client_new ();
694
695 /* Disable proxy support to prevent a deadlock on startup, since loading a
696 * proxy resolver causes the GIO modules to be loaded, and there will
697 * almost certainly be one of them which then tries to use GDBus.
698 * See: https://bugzilla.gnome.org/show_bug.cgi?id=792499 */
699 g_socket_client_set_enable_proxy (client, FALSE);
700
701 connection = g_socket_client_connect (client,
702 connectable,
703 cancellable,
704 error);
705 g_object_unref (connectable);
706 g_object_unref (client);
707 if (connection == NULL)
708 goto out;
709
710 ret = G_IO_STREAM (connection);
711
712 if (nonce_file != NULL)
713 {
714 gchar nonce_contents[16 + 1];
715 size_t num_bytes_read;
716 FILE *f;
717 int errsv;
718
719 /* be careful to read only 16 bytes - we also check that the file is only 16 bytes long */
720 f = fopen (nonce_file, "rb");
721 errsv = errno;
722 if (f == NULL)
723 {
724 g_set_error (error,
725 G_IO_ERROR,
726 G_IO_ERROR_INVALID_ARGUMENT,
727 _("Error opening nonce file “%s”: %s"),
728 nonce_file,
729 g_strerror (errsv));
730 g_object_unref (ret);
731 ret = NULL;
732 goto out;
733 }
734 num_bytes_read = fread (nonce_contents,
735 sizeof (gchar),
736 16 + 1,
737 f);
738 errsv = errno;
739 if (num_bytes_read != 16)
740 {
741 if (num_bytes_read == 0)
742 {
743 g_set_error (error,
744 G_IO_ERROR,
745 G_IO_ERROR_INVALID_ARGUMENT,
746 _("Error reading from nonce file “%s”: %s"),
747 nonce_file,
748 g_strerror (errsv));
749 }
750 else
751 {
752 g_set_error (error,
753 G_IO_ERROR,
754 G_IO_ERROR_INVALID_ARGUMENT,
755 _("Error reading from nonce file “%s”, expected 16 bytes, got %d"),
756 nonce_file,
757 (gint) num_bytes_read);
758 }
759 g_object_unref (ret);
760 ret = NULL;
761 fclose (f);
762 goto out;
763 }
764 fclose (f);
765
766 if (!g_output_stream_write_all (g_io_stream_get_output_stream (ret),
767 nonce_contents,
768 16,
769 NULL,
770 cancellable,
771 error))
772 {
773 g_prefix_error (error, _("Error writing contents of nonce file “%s” to stream:"), nonce_file);
774 g_object_unref (ret);
775 ret = NULL;
776 goto out;
777 }
778 }
779 }
780
781 out:
782
783 return ret;
784 }
785
786 static GIOStream *
g_dbus_address_try_connect_one(const gchar * address_entry,gchar ** out_guid,GCancellable * cancellable,GError ** error)787 g_dbus_address_try_connect_one (const gchar *address_entry,
788 gchar **out_guid,
789 GCancellable *cancellable,
790 GError **error)
791 {
792 GIOStream *ret;
793 GHashTable *key_value_pairs;
794 gchar *transport_name;
795 const gchar *guid;
796
797 ret = NULL;
798 transport_name = NULL;
799 key_value_pairs = NULL;
800
801 if (!_g_dbus_address_parse_entry (address_entry,
802 &transport_name,
803 &key_value_pairs,
804 error))
805 goto out;
806
807 ret = g_dbus_address_connect (address_entry,
808 transport_name,
809 key_value_pairs,
810 cancellable,
811 error);
812 if (ret == NULL)
813 goto out;
814
815 guid = g_hash_table_lookup (key_value_pairs, "guid");
816 if (guid != NULL && out_guid != NULL)
817 *out_guid = g_strdup (guid);
818
819 out:
820 g_free (transport_name);
821 if (key_value_pairs != NULL)
822 g_hash_table_unref (key_value_pairs);
823 return ret;
824 }
825
826
827 /* ---------------------------------------------------------------------------------------------------- */
828
829 typedef struct {
830 gchar *address;
831 gchar *guid;
832 } GetStreamData;
833
834 static void
get_stream_data_free(GetStreamData * data)835 get_stream_data_free (GetStreamData *data)
836 {
837 g_free (data->address);
838 g_free (data->guid);
839 g_free (data);
840 }
841
842 static void
get_stream_thread_func(GTask * task,gpointer source_object,gpointer task_data,GCancellable * cancellable)843 get_stream_thread_func (GTask *task,
844 gpointer source_object,
845 gpointer task_data,
846 GCancellable *cancellable)
847 {
848 GetStreamData *data = task_data;
849 GIOStream *stream;
850 GError *error = NULL;
851
852 stream = g_dbus_address_get_stream_sync (data->address,
853 &data->guid,
854 cancellable,
855 &error);
856 if (stream)
857 g_task_return_pointer (task, stream, g_object_unref);
858 else
859 g_task_return_error (task, error);
860 }
861
862 /**
863 * g_dbus_address_get_stream:
864 * @address: A valid D-Bus address.
865 * @cancellable: (nullable): A #GCancellable or %NULL.
866 * @callback: A #GAsyncReadyCallback to call when the request is satisfied.
867 * @user_data: Data to pass to @callback.
868 *
869 * Asynchronously connects to an endpoint specified by @address and
870 * sets up the connection so it is in a state to run the client-side
871 * of the D-Bus authentication conversation. @address must be in the
872 * [D-Bus address format](https://dbus.freedesktop.org/doc/dbus-specification.html#addresses).
873 *
874 * When the operation is finished, @callback will be invoked. You can
875 * then call g_dbus_address_get_stream_finish() to get the result of
876 * the operation.
877 *
878 * This is an asynchronous failable function. See
879 * g_dbus_address_get_stream_sync() for the synchronous version.
880 *
881 * Since: 2.26
882 */
883 void
g_dbus_address_get_stream(const gchar * address,GCancellable * cancellable,GAsyncReadyCallback callback,gpointer user_data)884 g_dbus_address_get_stream (const gchar *address,
885 GCancellable *cancellable,
886 GAsyncReadyCallback callback,
887 gpointer user_data)
888 {
889 GTask *task;
890 GetStreamData *data;
891
892 g_return_if_fail (address != NULL);
893
894 data = g_new0 (GetStreamData, 1);
895 data->address = g_strdup (address);
896
897 task = g_task_new (NULL, cancellable, callback, user_data);
898 g_task_set_source_tag (task, g_dbus_address_get_stream);
899 g_task_set_task_data (task, data, (GDestroyNotify) get_stream_data_free);
900 g_task_run_in_thread (task, get_stream_thread_func);
901 g_object_unref (task);
902 }
903
904 /**
905 * g_dbus_address_get_stream_finish:
906 * @res: A #GAsyncResult obtained from the GAsyncReadyCallback passed to g_dbus_address_get_stream().
907 * @out_guid: (optional) (out) (nullable): %NULL or return location to store the GUID extracted from @address, if any.
908 * @error: Return location for error or %NULL.
909 *
910 * Finishes an operation started with g_dbus_address_get_stream().
911 *
912 * A server is not required to set a GUID, so @out_guid may be set to %NULL
913 * even on success.
914 *
915 * Returns: (transfer full): A #GIOStream or %NULL if @error is set.
916 *
917 * Since: 2.26
918 */
919 GIOStream *
g_dbus_address_get_stream_finish(GAsyncResult * res,gchar ** out_guid,GError ** error)920 g_dbus_address_get_stream_finish (GAsyncResult *res,
921 gchar **out_guid,
922 GError **error)
923 {
924 GTask *task;
925 GetStreamData *data;
926 GIOStream *ret;
927
928 g_return_val_if_fail (g_task_is_valid (res, NULL), NULL);
929 g_return_val_if_fail (error == NULL || *error == NULL, NULL);
930
931 task = G_TASK (res);
932 ret = g_task_propagate_pointer (task, error);
933
934 if (ret != NULL && out_guid != NULL)
935 {
936 data = g_task_get_task_data (task);
937 *out_guid = data->guid;
938 data->guid = NULL;
939 }
940
941 return ret;
942 }
943
944 /**
945 * g_dbus_address_get_stream_sync:
946 * @address: A valid D-Bus address.
947 * @out_guid: (optional) (out) (nullable): %NULL or return location to store the GUID extracted from @address, if any.
948 * @cancellable: (nullable): A #GCancellable or %NULL.
949 * @error: Return location for error or %NULL.
950 *
951 * Synchronously connects to an endpoint specified by @address and
952 * sets up the connection so it is in a state to run the client-side
953 * of the D-Bus authentication conversation. @address must be in the
954 * [D-Bus address format](https://dbus.freedesktop.org/doc/dbus-specification.html#addresses).
955 *
956 * A server is not required to set a GUID, so @out_guid may be set to %NULL
957 * even on success.
958 *
959 * This is a synchronous failable function. See
960 * g_dbus_address_get_stream() for the asynchronous version.
961 *
962 * Returns: (transfer full): A #GIOStream or %NULL if @error is set.
963 *
964 * Since: 2.26
965 */
966 GIOStream *
g_dbus_address_get_stream_sync(const gchar * address,gchar ** out_guid,GCancellable * cancellable,GError ** error)967 g_dbus_address_get_stream_sync (const gchar *address,
968 gchar **out_guid,
969 GCancellable *cancellable,
970 GError **error)
971 {
972 GIOStream *ret;
973 gchar **addr_array;
974 guint n;
975 GError *last_error;
976
977 g_return_val_if_fail (address != NULL, NULL);
978 g_return_val_if_fail (error == NULL || *error == NULL, NULL);
979
980 ret = NULL;
981 last_error = NULL;
982
983 addr_array = g_strsplit (address, ";", 0);
984 if (addr_array[0] == NULL)
985 {
986 last_error = g_error_new_literal (G_IO_ERROR,
987 G_IO_ERROR_INVALID_ARGUMENT,
988 _("The given address is empty"));
989 goto out;
990 }
991
992 for (n = 0; addr_array[n] != NULL; n++)
993 {
994 const gchar *addr = addr_array[n];
995 GError *this_error;
996
997 this_error = NULL;
998 ret = g_dbus_address_try_connect_one (addr,
999 out_guid,
1000 cancellable,
1001 &this_error);
1002 if (ret != NULL)
1003 {
1004 goto out;
1005 }
1006 else
1007 {
1008 g_assert (this_error != NULL);
1009 if (last_error != NULL)
1010 g_error_free (last_error);
1011 last_error = this_error;
1012 }
1013 }
1014
1015 out:
1016 if (ret != NULL)
1017 {
1018 if (last_error != NULL)
1019 g_error_free (last_error);
1020 }
1021 else
1022 {
1023 g_assert (last_error != NULL);
1024 g_propagate_error (error, last_error);
1025 }
1026
1027 g_strfreev (addr_array);
1028 return ret;
1029 }
1030
1031 /* ---------------------------------------------------------------------------------------------------- */
1032
1033 /*
1034 * Return the address of XDG_RUNTIME_DIR/bus if it exists, belongs to
1035 * us, and is a socket, and we are on Unix.
1036 */
1037 static gchar *
get_session_address_xdg(void)1038 get_session_address_xdg (void)
1039 {
1040 #ifdef G_OS_UNIX
1041 gchar *ret = NULL;
1042 gchar *bus;
1043 gchar *tmp;
1044 GStatBuf buf;
1045
1046 bus = g_build_filename (g_get_user_runtime_dir (), "bus", NULL);
1047
1048 /* if ENOENT, EPERM, etc., quietly don't use it */
1049 if (g_stat (bus, &buf) < 0)
1050 goto out;
1051
1052 /* if it isn't ours, we have incorrectly inherited someone else's
1053 * XDG_RUNTIME_DIR; silently don't use it
1054 */
1055 if (buf.st_uid != geteuid ())
1056 goto out;
1057
1058 /* if it isn't a socket, silently don't use it */
1059 if ((buf.st_mode & S_IFMT) != S_IFSOCK)
1060 goto out;
1061
1062 tmp = g_dbus_address_escape_value (bus);
1063 ret = g_strconcat ("unix:path=", tmp, NULL);
1064 g_free (tmp);
1065
1066 out:
1067 g_free (bus);
1068 return ret;
1069 #else
1070 return NULL;
1071 #endif
1072 }
1073
1074 /* ---------------------------------------------------------------------------------------------------- */
1075
1076 #ifdef G_OS_UNIX
1077 static gchar *
get_session_address_dbus_launch(GError ** error)1078 get_session_address_dbus_launch (GError **error)
1079 {
1080 gchar *ret;
1081 gchar *machine_id;
1082 gchar *command_line;
1083 gchar *launch_stdout;
1084 gchar *launch_stderr;
1085 gint exit_status;
1086 gchar *old_dbus_verbose;
1087 gboolean restore_dbus_verbose;
1088
1089 ret = NULL;
1090 machine_id = NULL;
1091 command_line = NULL;
1092 launch_stdout = NULL;
1093 launch_stderr = NULL;
1094 restore_dbus_verbose = FALSE;
1095 old_dbus_verbose = NULL;
1096
1097 /* Don't run binaries as root if we're setuid. */
1098 if (GLIB_PRIVATE_CALL (g_check_setuid) ())
1099 {
1100 g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
1101 _("Cannot spawn a message bus when setuid"));
1102 goto out;
1103 }
1104
1105 machine_id = _g_dbus_get_machine_id (error);
1106 if (machine_id == NULL)
1107 {
1108 g_prefix_error (error, _("Cannot spawn a message bus without a machine-id: "));
1109 goto out;
1110 }
1111
1112 if (g_getenv ("DISPLAY") == NULL)
1113 {
1114 g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
1115 _("Cannot autolaunch D-Bus without X11 $DISPLAY"));
1116 goto out;
1117 }
1118
1119 /* We're using private libdbus facilities here. When everything
1120 * (X11, Mac OS X, Windows) is spec'ed out correctly (not even the
1121 * X11 property is correctly documented right now) we should
1122 * consider using the spec instead of dbus-launch.
1123 *
1124 * --autolaunch=MACHINEID
1125 * This option implies that dbus-launch should scan for a previ‐
1126 * ously-started session and reuse the values found there. If no
1127 * session is found, it will start a new session. The --exit-with-
1128 * session option is implied if --autolaunch is given. This option
1129 * is for the exclusive use of libdbus, you do not want to use it
1130 * manually. It may change in the future.
1131 */
1132
1133 /* TODO: maybe provide a variable for where to look for the dbus-launch binary? */
1134 command_line = g_strdup_printf ("dbus-launch --autolaunch=%s --binary-syntax --close-stderr", machine_id);
1135
1136 if (G_UNLIKELY (_g_dbus_debug_address ()))
1137 {
1138 _g_dbus_debug_print_lock ();
1139 g_print ("GDBus-debug:Address: Running '%s' to get bus address (possibly autolaunching)\n", command_line);
1140 old_dbus_verbose = g_strdup (g_getenv ("DBUS_VERBOSE"));
1141 restore_dbus_verbose = TRUE;
1142 g_setenv ("DBUS_VERBOSE", "1", TRUE);
1143 _g_dbus_debug_print_unlock ();
1144 }
1145
1146 if (!g_spawn_command_line_sync (command_line,
1147 &launch_stdout,
1148 &launch_stderr,
1149 &exit_status,
1150 error))
1151 {
1152 goto out;
1153 }
1154
1155 if (!g_spawn_check_exit_status (exit_status, error))
1156 {
1157 g_prefix_error (error, _("Error spawning command line “%s”: "), command_line);
1158 goto out;
1159 }
1160
1161 /* From the dbus-launch(1) man page:
1162 *
1163 * --binary-syntax Write to stdout a nul-terminated bus address,
1164 * then the bus PID as a binary integer of size sizeof(pid_t),
1165 * then the bus X window ID as a binary integer of size
1166 * sizeof(long). Integers are in the machine's byte order, not
1167 * network byte order or any other canonical byte order.
1168 */
1169 ret = g_strdup (launch_stdout);
1170
1171 out:
1172 if (G_UNLIKELY (_g_dbus_debug_address ()))
1173 {
1174 gchar *s;
1175 _g_dbus_debug_print_lock ();
1176 g_print ("GDBus-debug:Address: dbus-launch output:");
1177 if (launch_stdout != NULL)
1178 {
1179 s = _g_dbus_hexdump (launch_stdout, strlen (launch_stdout) + 1 + sizeof (pid_t) + sizeof (long), 2);
1180 g_print ("\n%s", s);
1181 g_free (s);
1182 }
1183 else
1184 {
1185 g_print (" (none)\n");
1186 }
1187 g_print ("GDBus-debug:Address: dbus-launch stderr output:");
1188 if (launch_stderr != NULL)
1189 g_print ("\n%s", launch_stderr);
1190 else
1191 g_print (" (none)\n");
1192 _g_dbus_debug_print_unlock ();
1193 }
1194
1195 g_free (machine_id);
1196 g_free (command_line);
1197 g_free (launch_stdout);
1198 g_free (launch_stderr);
1199 if (G_UNLIKELY (restore_dbus_verbose))
1200 {
1201 if (old_dbus_verbose != NULL)
1202 g_setenv ("DBUS_VERBOSE", old_dbus_verbose, TRUE);
1203 else
1204 g_unsetenv ("DBUS_VERBOSE");
1205 }
1206 g_free (old_dbus_verbose);
1207 return ret;
1208 }
1209
1210 /* end of G_OS_UNIX case */
1211 #elif defined(G_OS_WIN32)
1212
1213 static gchar *
get_session_address_dbus_launch(GError ** error)1214 get_session_address_dbus_launch (GError **error)
1215 {
1216 return _g_dbus_win32_get_session_address_dbus_launch (error);
1217 }
1218
1219 #else /* neither G_OS_UNIX nor G_OS_WIN32 */
1220 static gchar *
get_session_address_dbus_launch(GError ** error)1221 get_session_address_dbus_launch (GError **error)
1222 {
1223 g_set_error (error,
1224 G_IO_ERROR,
1225 G_IO_ERROR_FAILED,
1226 _("Cannot determine session bus address (not implemented for this OS)"));
1227 return NULL;
1228 }
1229 #endif /* neither G_OS_UNIX nor G_OS_WIN32 */
1230
1231 /* ---------------------------------------------------------------------------------------------------- */
1232
1233 static gchar *
get_session_address_platform_specific(GError ** error)1234 get_session_address_platform_specific (GError **error)
1235 {
1236 gchar *ret;
1237
1238 /* Use XDG_RUNTIME_DIR/bus if it exists and is suitable. This is appropriate
1239 * for systems using the "a session is a user-session" model described in
1240 * <http://lists.freedesktop.org/archives/dbus/2015-January/016522.html>,
1241 * and implemented in dbus >= 1.9.14 and sd-bus.
1242 *
1243 * On systems following the more traditional "a session is a login-session"
1244 * model, this will fail and we'll fall through to X11 autolaunching
1245 * (dbus-launch) below.
1246 */
1247 ret = get_session_address_xdg ();
1248
1249 if (ret != NULL)
1250 return ret;
1251
1252 /* TODO (#694472): try launchd on OS X, like
1253 * _dbus_lookup_session_address_launchd() does, since
1254 * 'dbus-launch --autolaunch' probably won't work there
1255 */
1256
1257 /* As a last resort, try the "autolaunch:" transport. On Unix this means
1258 * X11 autolaunching; on Windows this means a different autolaunching
1259 * mechanism based on shared memory.
1260 */
1261 return get_session_address_dbus_launch (error);
1262 }
1263
1264 /* ---------------------------------------------------------------------------------------------------- */
1265
1266 /**
1267 * g_dbus_address_get_for_bus_sync:
1268 * @bus_type: a #GBusType
1269 * @cancellable: (nullable): a #GCancellable or %NULL
1270 * @error: return location for error or %NULL
1271 *
1272 * Synchronously looks up the D-Bus address for the well-known message
1273 * bus instance specified by @bus_type. This may involve using various
1274 * platform specific mechanisms.
1275 *
1276 * The returned address will be in the
1277 * [D-Bus address format](https://dbus.freedesktop.org/doc/dbus-specification.html#addresses).
1278 *
1279 * Returns: (transfer full): a valid D-Bus address string for @bus_type or
1280 * %NULL if @error is set
1281 *
1282 * Since: 2.26
1283 */
1284 gchar *
g_dbus_address_get_for_bus_sync(GBusType bus_type,GCancellable * cancellable,GError ** error)1285 g_dbus_address_get_for_bus_sync (GBusType bus_type,
1286 GCancellable *cancellable,
1287 GError **error)
1288 {
1289 gboolean has_elevated_privileges = GLIB_PRIVATE_CALL (g_check_setuid) ();
1290 gchar *ret, *s = NULL;
1291 const gchar *starter_bus;
1292 GError *local_error;
1293
1294 g_return_val_if_fail (error == NULL || *error == NULL, NULL);
1295
1296 ret = NULL;
1297 local_error = NULL;
1298
1299 if (G_UNLIKELY (_g_dbus_debug_address ()))
1300 {
1301 guint n;
1302 _g_dbus_debug_print_lock ();
1303 s = _g_dbus_enum_to_string (G_TYPE_BUS_TYPE, bus_type);
1304 g_print ("GDBus-debug:Address: In g_dbus_address_get_for_bus_sync() for bus type '%s'\n",
1305 s);
1306 g_free (s);
1307 for (n = 0; n < 3; n++)
1308 {
1309 const gchar *k;
1310 const gchar *v;
1311 switch (n)
1312 {
1313 case 0: k = "DBUS_SESSION_BUS_ADDRESS"; break;
1314 case 1: k = "DBUS_SYSTEM_BUS_ADDRESS"; break;
1315 case 2: k = "DBUS_STARTER_BUS_TYPE"; break;
1316 default: g_assert_not_reached ();
1317 }
1318 v = g_getenv (k);
1319 g_print ("GDBus-debug:Address: env var %s", k);
1320 if (v != NULL)
1321 g_print ("='%s'\n", v);
1322 else
1323 g_print (" is not set\n");
1324 }
1325 _g_dbus_debug_print_unlock ();
1326 }
1327
1328 /* Don’t load the addresses from the environment if running as setuid, as they
1329 * come from an unprivileged caller. */
1330 switch (bus_type)
1331 {
1332 case G_BUS_TYPE_SYSTEM:
1333 if (has_elevated_privileges)
1334 ret = NULL;
1335 else
1336 ret = g_strdup (g_getenv ("DBUS_SYSTEM_BUS_ADDRESS"));
1337
1338 if (ret == NULL)
1339 {
1340 ret = g_strdup ("unix:path=/var/run/dbus/system_bus_socket");
1341 }
1342 break;
1343
1344 case G_BUS_TYPE_SESSION:
1345 if (has_elevated_privileges)
1346 {
1347 #ifdef G_OS_UNIX
1348 if (geteuid () == getuid ())
1349 {
1350 /* Ideally we shouldn't do this, because setgid and
1351 * filesystem capabilities are also elevated privileges
1352 * with which we should not be trusting environment variables
1353 * from the caller. Unfortunately, there are programs with
1354 * elevated privileges that rely on the session bus being
1355 * available. We already prevent the really dangerous
1356 * transports like autolaunch: and unixexec: when our
1357 * privileges are elevated, so this can only make us connect
1358 * to the wrong AF_UNIX or TCP socket. */
1359 ret = g_strdup (g_getenv ("DBUS_SESSION_BUS_ADDRESS"));
1360 }
1361 else
1362 #endif
1363 {
1364 ret = NULL;
1365 }
1366 }
1367 else
1368 {
1369 ret = g_strdup (g_getenv ("DBUS_SESSION_BUS_ADDRESS"));
1370 }
1371
1372 if (ret == NULL)
1373 {
1374 ret = get_session_address_platform_specific (&local_error);
1375 }
1376 break;
1377
1378 case G_BUS_TYPE_STARTER:
1379 starter_bus = g_getenv ("DBUS_STARTER_BUS_TYPE");
1380 if (g_strcmp0 (starter_bus, "session") == 0)
1381 {
1382 ret = g_dbus_address_get_for_bus_sync (G_BUS_TYPE_SESSION, cancellable, &local_error);
1383 goto out;
1384 }
1385 else if (g_strcmp0 (starter_bus, "system") == 0)
1386 {
1387 ret = g_dbus_address_get_for_bus_sync (G_BUS_TYPE_SYSTEM, cancellable, &local_error);
1388 goto out;
1389 }
1390 else
1391 {
1392 if (starter_bus != NULL)
1393 {
1394 g_set_error (&local_error,
1395 G_IO_ERROR,
1396 G_IO_ERROR_FAILED,
1397 _("Cannot determine bus address from DBUS_STARTER_BUS_TYPE environment variable"
1398 " — unknown value “%s”"),
1399 starter_bus);
1400 }
1401 else
1402 {
1403 g_set_error_literal (&local_error,
1404 G_IO_ERROR,
1405 G_IO_ERROR_FAILED,
1406 _("Cannot determine bus address because the DBUS_STARTER_BUS_TYPE environment "
1407 "variable is not set"));
1408 }
1409 }
1410 break;
1411
1412 default:
1413 g_set_error (&local_error,
1414 G_IO_ERROR,
1415 G_IO_ERROR_FAILED,
1416 _("Unknown bus type %d"),
1417 bus_type);
1418 break;
1419 }
1420
1421 out:
1422 if (G_UNLIKELY (_g_dbus_debug_address ()))
1423 {
1424 _g_dbus_debug_print_lock ();
1425 s = _g_dbus_enum_to_string (G_TYPE_BUS_TYPE, bus_type);
1426 if (ret != NULL)
1427 {
1428 g_print ("GDBus-debug:Address: Returning address '%s' for bus type '%s'\n",
1429 ret, s);
1430 }
1431 else
1432 {
1433 g_print ("GDBus-debug:Address: Cannot look-up address bus type '%s': %s\n",
1434 s, local_error ? local_error->message : "");
1435 }
1436 g_free (s);
1437 _g_dbus_debug_print_unlock ();
1438 }
1439
1440 if (local_error != NULL)
1441 g_propagate_error (error, local_error);
1442
1443 return ret;
1444 }
1445
1446 /**
1447 * g_dbus_address_escape_value:
1448 * @string: an unescaped string to be included in a D-Bus address
1449 * as the value in a key-value pair
1450 *
1451 * Escape @string so it can appear in a D-Bus address as the value
1452 * part of a key-value pair.
1453 *
1454 * For instance, if @string is `/run/bus-for-:0`,
1455 * this function would return `/run/bus-for-%3A0`,
1456 * which could be used in a D-Bus address like
1457 * `unix:nonce-tcp:host=127.0.0.1,port=42,noncefile=/run/bus-for-%3A0`.
1458 *
1459 * Returns: (transfer full): a copy of @string with all
1460 * non-optionally-escaped bytes escaped
1461 *
1462 * Since: 2.36
1463 */
1464 gchar *
g_dbus_address_escape_value(const gchar * string)1465 g_dbus_address_escape_value (const gchar *string)
1466 {
1467 GString *s;
1468 gsize i;
1469
1470 g_return_val_if_fail (string != NULL, NULL);
1471
1472 /* There will often not be anything needing escaping at all. */
1473 s = g_string_sized_new (strlen (string));
1474
1475 /* D-Bus address escaping is mostly the same as URI escaping... */
1476 g_string_append_uri_escaped (s, string, "\\/", FALSE);
1477
1478 /* ... but '~' is an unreserved character in URIs, but a
1479 * non-optionally-escaped character in D-Bus addresses. */
1480 for (i = 0; i < s->len; i++)
1481 {
1482 if (G_UNLIKELY (s->str[i] == '~'))
1483 {
1484 s->str[i] = '%';
1485 g_string_insert (s, i + 1, "7E");
1486 i += 2;
1487 }
1488 }
1489
1490 return g_string_free (s, FALSE);
1491 }
1492