gio/gdbusaddress.c

   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 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, write to the
  17  * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
  18  * Boston, MA 02111-1307, USA.
  19  *
  20  * Author: David Zeuthen <davidz@redhat.com>
  21  */
  22
  23 #include "config.h"
  24
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <stdio.h>
  28 #include <errno.h>
  29
  30 #include "gioerror.h"
  31 #include "gdbusutils.h"
  32 #include "gdbusaddress.h"
  33 #include "gdbuserror.h"
  34 #include "gioenumtypes.h"
  35 #include "gnetworkaddress.h"
  36 #include "gsocketclient.h"
  37 #include "giostream.h"
  38 #include "gasyncresult.h"
  39 #include "gsimpleasyncresult.h"
  40 #include "gdbusprivate.h"
  41
  42 #ifdef G_OS_UNIX
  43 #include <gio/gunixsocketaddress.h>
  44 #include <sys/wait.h>
  45 #endif
  46
  47 #include "glibintl.h"
  48
  49 /**
  50  * SECTION:gdbusaddress
  51  * @title: D-Bus Addresses
  52  * @short_description: D-Bus connection endpoints
  53  * @include: gio/gio.h
  54  *
  55  * Routines for working with D-Bus addresses. A D-Bus address is a string
  56  * like "unix:tmpdir=/tmp/my-app-name". The exact format of addresses
  57  * is explained in detail in the <link linkend="http://dbus.freedesktop.org/doc/dbus-specification.html&num;addresses">D-Bus specification</link>.
  58  */
  59
  60 static gchar *get_session_address_platform_specific (GError **error);
  61
  62 /* ---------------------------------------------------------------------------------------------------- */
  63
  64 /**
  65  * g_dbus_is_address:
  66  * @string: A string.
  67  *
  68  * Checks if @string is a D-Bus address.
  69  *
  70  * This doesn't check if @string is actually supported by #GDBusServer
  71  * or #GDBusConnection - use g_dbus_is_supported_address() to do more
  72  * checks.
  73  *
  74  * Returns: %TRUE if @string is a valid D-Bus address, %FALSE otherwise.
  75  *
  76  * Since: 2.26
  77  */
  78 gboolean
  79 g_dbus_is_address (const gchar *string)
  80 {
  81   guint n;
  82   gchar **a;
  83   gboolean ret;
  84
  85   ret = FALSE;
  86
  87   g_return_val_if_fail (string != NULL, FALSE);
  88
  89   a = g_strsplit (string, ";", 0);
  90   if (a[0] == NULL)
  91     goto out;
  92
  93   for (n = 0; a[n] != NULL; n++)
  94     {
  95       if (!_g_dbus_address_parse_entry (a[n],
  96                                         NULL,
  97                                         NULL,
  98                                         NULL))
  99         goto out;
 100     }
 101
 102   ret = TRUE;
 103
 104  out:
 105   g_strfreev (a);
 106   return ret;
 107 }
 108
 109 static gboolean
 110 is_valid_unix (const gchar  *address_entry,
 111                GHashTable   *key_value_pairs,
 112                GError      **error)
 113 {
 114   gboolean ret;
 115   GList *keys;
 116   GList *l;
 117   const gchar *path;
 118   const gchar *tmpdir;
 119   const gchar *abstract;
 120
 121   ret = FALSE;
 122   keys = NULL;
 123   path = NULL;
 124   tmpdir = NULL;
 125   abstract = NULL;
 126
 127   keys = g_hash_table_get_keys (key_value_pairs);
 128   for (l = keys; l != NULL; l = l->next)
 129     {
 130       const gchar *key = l->data;
 131       if (g_strcmp0 (key, "path") == 0)
 132         path = g_hash_table_lookup (key_value_pairs, key);
 133       else if (g_strcmp0 (key, "tmpdir") == 0)
 134         tmpdir = g_hash_table_lookup (key_value_pairs, key);
 135       else if (g_strcmp0 (key, "abstract") == 0)
 136         abstract = g_hash_table_lookup (key_value_pairs, key);
 137       else
 138         {
 139           g_set_error (error,
 140                        G_IO_ERROR,
 141                        G_IO_ERROR_INVALID_ARGUMENT,
 142                        _("Unsupported key `%s' in address entry `%s'"),
 143                        key,
 144                        address_entry);
 145           goto out;
 146         }
 147     }
 148
 149   if (path != NULL)
 150     {
 151       if (tmpdir != NULL || abstract != NULL)
 152         goto meaningless;
 153     }
 154   else if (tmpdir != NULL)
 155     {
 156       if (path != NULL || abstract != NULL)
 157         goto meaningless;
 158     }
 159   else if (abstract != NULL)
 160     {
 161       if (path != NULL || tmpdir != NULL)
 162         goto meaningless;
 163     }
 164   else
 165     {
 166       g_set_error (error,
 167                    G_IO_ERROR,
 168                    G_IO_ERROR_INVALID_ARGUMENT,
 169                    _("Address `%s' is invalid (need exactly one of path, tmpdir or abstract keys)"),
 170                    address_entry);
 171       goto out;
 172     }
 173
 174
 175   ret= TRUE;
 176   goto out;
 177
 178  meaningless:
 179   g_set_error (error,
 180                G_IO_ERROR,
 181                G_IO_ERROR_INVALID_ARGUMENT,
 182                _("Meaningless key/value pair combination in address entry `%s'"),
 183                address_entry);
 184
 185  out:
 186   g_list_free (keys);
 187
 188   return ret;
 189 }
 190
 191 static gboolean
 192 is_valid_nonce_tcp (const gchar  *address_entry,
 193                     GHashTable   *key_value_pairs,
 194                     GError      **error)
 195 {
 196   gboolean ret;
 197   GList *keys;
 198   GList *l;
 199   const gchar *host;
 200   const gchar *port;
 201   const gchar *family;
 202   const gchar *nonce_file;
 203   gint port_num;
 204   gchar *endp;
 205
 206   ret = FALSE;
 207   keys = NULL;
 208   host = NULL;
 209   port = NULL;
 210   family = NULL;
 211   nonce_file = NULL;
 212
 213   keys = g_hash_table_get_keys (key_value_pairs);
 214   for (l = keys; l != NULL; l = l->next)
 215     {
 216       const gchar *key = l->data;
 217       if (g_strcmp0 (key, "host") == 0)
 218         host = g_hash_table_lookup (key_value_pairs, key);
 219       else if (g_strcmp0 (key, "port") == 0)
 220         port = g_hash_table_lookup (key_value_pairs, key);
 221       else if (g_strcmp0 (key, "family") == 0)
 222         family = g_hash_table_lookup (key_value_pairs, key);
 223       else if (g_strcmp0 (key, "noncefile") == 0)
 224         nonce_file = g_hash_table_lookup (key_value_pairs, key);
 225       else
 226         {
 227           g_set_error (error,
 228                        G_IO_ERROR,
 229                        G_IO_ERROR_INVALID_ARGUMENT,
 230                        _("Unsupported key `%s' in address entry `%s'"),
 231                        key,
 232                        address_entry);
 233           goto out;
 234         }
 235     }
 236
 237   if (port != NULL)
 238     {
 239       port_num = strtol (port, &endp, 10);
 240       if ((*port == '\0' || *endp != '\0') || port_num < 0 || port_num >= 65536)
 241         {
 242           g_set_error (error,
 243                        G_IO_ERROR,
 244                        G_IO_ERROR_INVALID_ARGUMENT,
 245                        _("Error in address `%s' - the port attribute is malformed"),
 246                        address_entry);
 247           goto out;
 248         }
 249     }
 250
 251   if (family != NULL && !(g_strcmp0 (family, "ipv4") == 0 || g_strcmp0 (family, "ipv6") == 0))
 252     {
 253       g_set_error (error,
 254                    G_IO_ERROR,
 255                    G_IO_ERROR_INVALID_ARGUMENT,
 256                    _("Error in address `%s' - the family attribute is malformed"),
 257                    address_entry);
 258       goto out;
 259     }
 260
 261   ret= TRUE;
 262
 263  out:
 264   g_list_free (keys);
 265
 266   return ret;
 267 }
 268
 269 static gboolean
 270 is_valid_tcp (const gchar  *address_entry,
 271               GHashTable   *key_value_pairs,
 272               GError      **error)
 273 {
 274   gboolean ret;
 275   GList *keys;
 276   GList *l;
 277   const gchar *host;
 278   const gchar *port;
 279   const gchar *family;
 280   gint port_num;
 281   gchar *endp;
 282
 283   ret = FALSE;
 284   keys = NULL;
 285   host = NULL;
 286   port = NULL;
 287   family = NULL;
 288
 289   keys = g_hash_table_get_keys (key_value_pairs);
 290   for (l = keys; l != NULL; l = l->next)
 291     {
 292       const gchar *key = l->data;
 293       if (g_strcmp0 (key, "host") == 0)
 294         host = g_hash_table_lookup (key_value_pairs, key);
 295       else if (g_strcmp0 (key, "port") == 0)
 296         port = g_hash_table_lookup (key_value_pairs, key);
 297       else if (g_strcmp0 (key, "family") == 0)
 298         family = g_hash_table_lookup (key_value_pairs, key);
 299       else
 300         {
 301           g_set_error (error,
 302                        G_IO_ERROR,
 303                        G_IO_ERROR_INVALID_ARGUMENT,
 304                        _("Unsupported key `%s' in address entry `%s'"),
 305                        key,
 306                        address_entry);
 307           goto out;
 308         }
 309     }
 310
 311   if (port != NULL)
 312     {
 313       port_num = strtol (port, &endp, 10);
 314       if ((*port == '\0' || *endp != '\0') || port_num < 0 || port_num >= 65536)
 315         {
 316           g_set_error (error,
 317                        G_IO_ERROR,
 318                        G_IO_ERROR_INVALID_ARGUMENT,
 319                        _("Error in address `%s' - the port attribute is malformed"),
 320                        address_entry);
 321           goto out;
 322         }
 323     }
 324
 325   if (family != NULL && !(g_strcmp0 (family, "ipv4") == 0 || g_strcmp0 (family, "ipv6") == 0))
 326     {
 327       g_set_error (error,
 328                    G_IO_ERROR,
 329                    G_IO_ERROR_INVALID_ARGUMENT,
 330                    _("Error in address `%s' - the family attribute is malformed"),
 331                    address_entry);
 332       goto out;
 333     }
 334
 335   ret= TRUE;
 336
 337  out:
 338   g_list_free (keys);
 339
 340   return ret;
 341 }
 342
 343 /**
 344  * g_dbus_is_supported_address:
 345  * @string: A string.
 346  * @error: Return location for error or %NULL.
 347  *
 348  * Like g_dbus_is_address() but also checks if the library suppors the
 349  * transports in @string and that key/value pairs for each transport
 350  * are valid.
 351  *
 352  * Returns: %TRUE if @string is a valid D-Bus address that is
 353  * supported by this library, %FALSE if @error is set.
 354  *
 355  * Since: 2.26
 356  */
 357 gboolean
 358 g_dbus_is_supported_address (const gchar  *string,
 359                              GError      **error)
 360 {
 361   guint n;
 362   gchar **a;
 363   gboolean ret;
 364
 365   ret = FALSE;
 366
 367   g_return_val_if_fail (string != NULL, FALSE);
 368   g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
 369
 370   a = g_strsplit (string, ";", 0);
 371   for (n = 0; a[n] != NULL; n++)
 372     {
 373       gchar *transport_name;
 374       GHashTable *key_value_pairs;
 375       gboolean supported;
 376
 377       if (!_g_dbus_address_parse_entry (a[n],
 378                                         &transport_name,
 379                                         &key_value_pairs,
 380                                         error))
 381         goto out;
 382
 383       supported = FALSE;
 384       if (g_strcmp0 (transport_name, "unix") == 0)
 385         supported = is_valid_unix (a[n], key_value_pairs, error);
 386       else if (g_strcmp0 (transport_name, "tcp") == 0)
 387         supported = is_valid_tcp (a[n], key_value_pairs, error);
 388       else if (g_strcmp0 (transport_name, "nonce-tcp") == 0)
 389         supported = is_valid_nonce_tcp (a[n], key_value_pairs, error);
 390       else if (g_strcmp0 (a[n], "autolaunch:") == 0)
 391         supported = TRUE;
 392
 393       g_free (transport_name);
 394       g_hash_table_unref (key_value_pairs);
 395
 396       if (!supported)
 397         goto out;
 398     }
 399
 400   ret = TRUE;
 401
 402  out:
 403   g_strfreev (a);
 404
 405   g_assert (ret || (!ret && (error == NULL || *error != NULL)));
 406
 407   return ret;
 408 }
 409
 410 gboolean
 411 _g_dbus_address_parse_entry (const gchar  *address_entry,
 412                              gchar       **out_transport_name,
 413                              GHashTable  **out_key_value_pairs,
 414                              GError      **error)
 415 {
 416   gboolean ret;
 417   GHashTable *key_value_pairs;
 418   gchar *transport_name;
 419   gchar **kv_pairs;
 420   const gchar *s;
 421   guint n;
 422
 423   ret = FALSE;
 424   kv_pairs = NULL;
 425   transport_name = NULL;
 426   key_value_pairs = NULL;
 427
 428   s = strchr (address_entry, ':');
 429   if (s == NULL)
 430     {
 431       g_set_error (error,
 432                    G_IO_ERROR,
 433                    G_IO_ERROR_INVALID_ARGUMENT,
 434                    _("Address element `%s', does not contain a colon (:)"),
 435                    address_entry);
 436       goto out;
 437     }
 438
 439   transport_name = g_strndup (address_entry, s - address_entry);
 440   key_value_pairs = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, g_free);
 441
 442   kv_pairs = g_strsplit (s + 1, ",", 0);
 443   for (n = 0; kv_pairs != NULL && kv_pairs[n] != NULL; n++)
 444     {
 445       const gchar *kv_pair = kv_pairs[n];
 446       gchar *key;
 447       gchar *value;
 448
 449       s = strchr (kv_pair, '=');
 450       if (s == NULL)
 451         {
 452           g_set_error (error,
 453                        G_IO_ERROR,
 454                        G_IO_ERROR_INVALID_ARGUMENT,
 455                        _("Key/Value pair %d, `%s', in address element `%s', does not contain an equal sign"),
 456                        n,
 457                        kv_pair,
 458                        address_entry);
 459           goto out;
 460         }
 461
 462       key = g_uri_unescape_segment (kv_pair, s, NULL);
 463       value = g_uri_unescape_segment (s + 1, kv_pair + strlen (kv_pair), NULL);
 464       if (key == NULL || value == NULL)
 465         {
 466           g_set_error (error,
 467                        G_IO_ERROR,
 468                        G_IO_ERROR_INVALID_ARGUMENT,
 469                        _("Error unescaping key or value in Key/Value pair %d, `%s', in address element `%s'"),
 470                        n,
 471                        kv_pair,
 472                        address_entry);
 473           g_free (key);
 474           g_free (value);
 475           goto out;
 476         }
 477       g_hash_table_insert (key_value_pairs, key, value);
 478     }
 479
 480   ret = TRUE;
 481
 482 out:
 483   g_strfreev (kv_pairs);
 484   if (ret)
 485     {
 486       if (out_transport_name != NULL)
 487         *out_transport_name = transport_name;
 488       else
 489         g_free (transport_name);
 490       if (out_key_value_pairs != NULL)
 491         *out_key_value_pairs = key_value_pairs;
 492       else if (key_value_pairs != NULL)
 493         g_hash_table_unref (key_value_pairs);
 494     }
 495   else
 496     {
 497       g_free (transport_name);
 498       if (key_value_pairs != NULL)
 499         g_hash_table_unref (key_value_pairs);
 500     }
 501   return ret;
 502 }
 503
 504 /* ---------------------------------------------------------------------------------------------------- */
 505
 506 static GIOStream *
 507 g_dbus_address_try_connect_one (const gchar   *address_entry,
 508                                 gchar        **out_guid,
 509                                 GCancellable  *cancellable,
 510                                 GError       **error);
 511
 512 /* TODO: Declare an extension point called GDBusTransport (or similar)
 513  * and move code below to extensions implementing said extension
 514  * point. That way we can implement a D-Bus transport over X11 without
 515  * making libgio link to libX11...
 516  */
 517 static GIOStream *
 518 g_dbus_address_connect (const gchar   *address_entry,
 519                         const gchar   *transport_name,
 520                         GHashTable    *key_value_pairs,
 521                         GCancellable  *cancellable,
 522                         GError       **error)
 523 {
 524   GIOStream *ret;
 525   GSocketConnectable *connectable;
 526   const gchar *nonce_file;
 527
 528   connectable = NULL;
 529   ret = NULL;
 530   nonce_file = NULL;
 531
 532   if (FALSE)
 533     {
 534     }
 535 #ifdef G_OS_UNIX
 536   else if (g_strcmp0 (transport_name, "unix") == 0)
 537     {
 538       const gchar *path;
 539       const gchar *abstract;
 540       path = g_hash_table_lookup (key_value_pairs, "path");
 541       abstract = g_hash_table_lookup (key_value_pairs, "abstract");
 542       if ((path == NULL && abstract == NULL) || (path != NULL && abstract != NULL))
 543         {
 544           g_set_error (error,
 545                        G_IO_ERROR,
 546                        G_IO_ERROR_INVALID_ARGUMENT,
 547                        _("Error in address `%s' - the unix transport requires exactly one of the "
 548                          "keys `path' or `abstract' to be set"),
 549                        address_entry);
 550         }
 551       else if (path != NULL)
 552         {
 553           connectable = G_SOCKET_CONNECTABLE (g_unix_socket_address_new (path));
 554         }
 555       else if (abstract != NULL)
 556         {
 557           connectable = G_SOCKET_CONNECTABLE (g_unix_socket_address_new_with_type (abstract,
 558                                                                                    -1,
 559                                                                                    G_UNIX_SOCKET_ADDRESS_ABSTRACT));
 560         }
 561       else
 562         {
 563           g_assert_not_reached ();
 564         }
 565     }
 566 #endif
 567   else if (g_strcmp0 (transport_name, "tcp") == 0 || g_strcmp0 (transport_name, "nonce-tcp") == 0)
 568     {
 569       const gchar *s;
 570       const gchar *host;
 571       guint port;
 572       gchar *endp;
 573       gboolean is_nonce;
 574
 575       is_nonce = (g_strcmp0 (transport_name, "nonce-tcp") == 0);
 576
 577       host = g_hash_table_lookup (key_value_pairs, "host");
 578       if (host == NULL)
 579         {
 580           g_set_error (error,
 581                        G_IO_ERROR,
 582                        G_IO_ERROR_INVALID_ARGUMENT,
 583                        _("Error in address `%s' - the host attribute is missing or malformed"),
 584                        address_entry);
 585           goto out;
 586         }
 587
 588       s = g_hash_table_lookup (key_value_pairs, "port");
 589       if (s == NULL)
 590         s = "0";
 591       port = strtol (s, &endp, 10);
 592       if ((*s == '\0' || *endp != '\0') || port < 0 || port >= 65536)
 593         {
 594           g_set_error (error,
 595                        G_IO_ERROR,
 596                        G_IO_ERROR_INVALID_ARGUMENT,
 597                        _("Error in address `%s' - the port attribute is missing or malformed"),
 598                        address_entry);
 599           goto out;
 600         }
 601
 602
 603       if (is_nonce)
 604         {
 605           nonce_file = g_hash_table_lookup (key_value_pairs, "noncefile");
 606           if (nonce_file == NULL)
 607             {
 608               g_set_error (error,
 609                            G_IO_ERROR,
 610                            G_IO_ERROR_INVALID_ARGUMENT,
 611                            _("Error in address `%s' - the noncefile attribute is missing or malformed"),
 612                            address_entry);
 613               goto out;
 614             }
 615         }
 616
 617       /* TODO: deal with family key/value-pair */
 618       connectable = g_network_address_new (host, port);
 619     }
 620   else if (g_strcmp0 (address_entry, "autolaunch:") == 0)
 621     {
 622       gchar *autolaunch_address;
 623       autolaunch_address = get_session_address_platform_specific (error);
 624       if (autolaunch_address != NULL)
 625         {
 626           ret = g_dbus_address_try_connect_one (autolaunch_address, NULL, cancellable, error);
 627           g_free (autolaunch_address);
 628           goto out;
 629         }
 630       else
 631         {
 632           g_prefix_error (error, _("Error auto-launching: "));
 633         }
 634     }
 635   else
 636     {
 637       g_set_error (error,
 638                    G_IO_ERROR,
 639                    G_IO_ERROR_INVALID_ARGUMENT,
 640                    _("Unknown or unsupported transport `%s' for address `%s'"),
 641                    transport_name,
 642                    address_entry);
 643     }
 644
 645   if (connectable != NULL)
 646     {
 647       GSocketClient *client;
 648       GSocketConnection *connection;
 649
 650       g_assert (ret == NULL);
 651       client = g_socket_client_new ();
 652       connection = g_socket_client_connect (client,
 653                                             connectable,
 654                                             cancellable,
 655                                             error);
 656       g_object_unref (connectable);
 657       g_object_unref (client);
 658       if (connection == NULL)
 659         goto out;
 660
 661       ret = G_IO_STREAM (connection);
 662
 663       if (nonce_file != NULL)
 664         {
 665           gchar nonce_contents[16 + 1];
 666           size_t num_bytes_read;
 667           FILE *f;
 668
 669           /* be careful to read only 16 bytes - we also check that the file is only 16 bytes long */
 670           f = fopen (nonce_file, "rb");
 671           if (f == NULL)
 672             {
 673               g_set_error (error,
 674                            G_IO_ERROR,
 675                            G_IO_ERROR_INVALID_ARGUMENT,
 676                            _("Error opening nonce file `%s': %s"),
 677                            nonce_file,
 678                            g_strerror (errno));
 679               g_object_unref (ret);
 680               ret = NULL;
 681               goto out;
 682             }
 683           num_bytes_read = fread (nonce_contents,
 684                                   sizeof (gchar),
 685                                   16 + 1,
 686                                   f);
 687           if (num_bytes_read != 16)
 688             {
 689               if (num_bytes_read == 0)
 690                 {
 691                   g_set_error (error,
 692                                G_IO_ERROR,
 693                                G_IO_ERROR_INVALID_ARGUMENT,
 694                                _("Error reading from nonce file `%s': %s"),
 695                                nonce_file,
 696                                g_strerror (errno));
 697                 }
 698               else
 699                 {
 700                   g_set_error (error,
 701                                G_IO_ERROR,
 702                                G_IO_ERROR_INVALID_ARGUMENT,
 703                                _("Error reading from nonce file `%s', expected 16 bytes, got %d"),
 704                                nonce_file,
 705                                (gint) num_bytes_read);
 706                 }
 707               g_object_unref (ret);
 708               ret = NULL;
 709               fclose (f);
 710               goto out;
 711             }
 712           fclose (f);
 713
 714           if (!g_output_stream_write_all (g_io_stream_get_output_stream (ret),
 715                                           nonce_contents,
 716                                           16,
 717                                           NULL,
 718                                           cancellable,
 719                                           error))
 720             {
 721               g_prefix_error (error, _("Error writing contents of nonce file `%s' to stream:"), nonce_file);
 722               g_object_unref (ret);
 723               ret = NULL;
 724               goto out;
 725             }
 726         }
 727     }
 728
 729  out:
 730
 731   return ret;
 732 }
 733
 734 static GIOStream *
 735 g_dbus_address_try_connect_one (const gchar   *address_entry,
 736                                 gchar        **out_guid,
 737                                 GCancellable  *cancellable,
 738                                 GError       **error)
 739 {
 740   GIOStream *ret;
 741   GHashTable *key_value_pairs;
 742   gchar *transport_name;
 743   const gchar *guid;
 744
 745   ret = NULL;
 746   transport_name = NULL;
 747   key_value_pairs = NULL;
 748
 749   if (!_g_dbus_address_parse_entry (address_entry,
 750                                     &transport_name,
 751                                     &key_value_pairs,
 752                                     error))
 753     goto out;
 754
 755   ret = g_dbus_address_connect (address_entry,
 756                                 transport_name,
 757                                 key_value_pairs,
 758                                 cancellable,
 759                                 error);
 760   if (ret == NULL)
 761     goto out;
 762
 763   guid = g_hash_table_lookup (key_value_pairs, "guid");
 764   if (guid != NULL && out_guid != NULL)
 765     *out_guid = g_strdup (guid);
 766
 767 out:
 768   g_free (transport_name);
 769   if (key_value_pairs != NULL)
 770     g_hash_table_unref (key_value_pairs);
 771   return ret;
 772 }
 773
 774
 775 /* ---------------------------------------------------------------------------------------------------- */
 776
 777 typedef struct {
 778   gchar *address;
 779   GIOStream *stream;
 780   gchar *guid;
 781 } GetStreamData;
 782
 783 static void
 784 get_stream_data_free (GetStreamData *data)
 785 {
 786   g_free (data->address);
 787   if (data->stream != NULL)
 788     g_object_unref (data->stream);
 789   g_free (data->guid);
 790   g_free (data);
 791 }
 792
 793 static void
 794 get_stream_thread_func (GSimpleAsyncResult *res,
 795                         GObject            *object,
 796                         GCancellable       *cancellable)
 797 {
 798   GetStreamData *data;
 799   GError *error;
 800
 801   data = g_simple_async_result_get_op_res_gpointer (res);
 802
 803   error = NULL;
 804   data->stream = g_dbus_address_get_stream_sync (data->address,
 805                                                  &data->guid,
 806                                                  cancellable,
 807                                                  &error);
 808   if (data->stream == NULL)
 809     g_simple_async_result_take_error (res, error);
 810 }
 811
 812 /**
 813  * g_dbus_address_get_stream:
 814  * @address: A valid D-Bus address.
 815  * @cancellable: A #GCancellable or %NULL.
 816  * @callback: A #GAsyncReadyCallback to call when the request is satisfied.
 817  * @user_data: Data to pass to @callback.
 818  *
 819  * Asynchronously connects to an endpoint specified by @address and
 820  * sets up the connection so it is in a state to run the client-side
 821  * of the D-Bus authentication conversation.
 822  *
 823  * When the operation is finished, @callback will be invoked. You can
 824  * then call g_dbus_address_get_stream_finish() to get the result of
 825  * the operation.
 826  *
 827  * This is an asynchronous failable function. See
 828  * g_dbus_address_get_stream_sync() for the synchronous version.
 829  *
 830  * Since: 2.26
 831  */
 832 void
 833 g_dbus_address_get_stream (const gchar         *address,
 834                            GCancellable        *cancellable,
 835                            GAsyncReadyCallback  callback,
 836                            gpointer             user_data)
 837 {
 838   GSimpleAsyncResult *res;
 839   GetStreamData *data;
 840
 841   g_return_if_fail (address != NULL);
 842
 843   res = g_simple_async_result_new (NULL,
 844                                    callback,
 845                                    user_data,
 846                                    g_dbus_address_get_stream);
 847   data = g_new0 (GetStreamData, 1);
 848   data->address = g_strdup (address);
 849   g_simple_async_result_set_op_res_gpointer (res,
 850                                              data,
 851                                              (GDestroyNotify) get_stream_data_free);
 852   g_simple_async_result_run_in_thread (res,
 853                                        get_stream_thread_func,
 854                                        G_PRIORITY_DEFAULT,
 855                                        cancellable);
 856   g_object_unref (res);
 857 }
 858
 859 /**
 860  * g_dbus_address_get_stream_finish:
 861  * @res: A #GAsyncResult obtained from the GAsyncReadyCallback passed to g_dbus_address_get_stream().
 862  * @out_guid: %NULL or return location to store the GUID extracted from @address, if any.
 863  * @error: Return location for error or %NULL.
 864  *
 865  * Finishes an operation started with g_dbus_address_get_stream().
 866  *
 867  * Returns: (transfer full): A #GIOStream or %NULL if @error is set.
 868  *
 869  * Since: 2.26
 870  */
 871 GIOStream *
 872 g_dbus_address_get_stream_finish (GAsyncResult        *res,
 873                                   gchar              **out_guid,
 874                                   GError             **error)
 875 {
 876   GSimpleAsyncResult *simple = G_SIMPLE_ASYNC_RESULT (res);
 877   GetStreamData *data;
 878   GIOStream *ret;
 879
 880   g_return_val_if_fail (G_IS_ASYNC_RESULT (res), NULL);
 881   g_return_val_if_fail (error == NULL || *error == NULL, NULL);
 882
 883   g_warn_if_fail (g_simple_async_result_get_source_tag (simple) == g_dbus_address_get_stream);
 884
 885   ret = NULL;
 886
 887   data = g_simple_async_result_get_op_res_gpointer (simple);
 888   if (g_simple_async_result_propagate_error (simple, error))
 889     goto out;
 890
 891   ret = g_object_ref (data->stream);
 892   if (out_guid != NULL)
 893     *out_guid = g_strdup (data->guid);
 894
 895  out:
 896   return ret;
 897 }
 898
 899 /**
 900  * g_dbus_address_get_stream_sync:
 901  * @address: A valid D-Bus address.
 902  * @out_guid: %NULL or return location to store the GUID extracted from @address, if any.
 903  * @cancellable: A #GCancellable or %NULL.
 904  * @error: Return location for error or %NULL.
 905  *
 906  * Synchronously connects to an endpoint specified by @address and
 907  * sets up the connection so it is in a state to run the client-side
 908  * of the D-Bus authentication conversation.
 909  *
 910  * This is a synchronous failable function. See
 911  * g_dbus_address_get_stream() for the asynchronous version.
 912  *
 913  * Returns: (transfer full): A #GIOStream or %NULL if @error is set.
 914  *
 915  * Since: 2.26
 916  */
 917 GIOStream *
 918 g_dbus_address_get_stream_sync (const gchar   *address,
 919                                 gchar        **out_guid,
 920                                 GCancellable  *cancellable,
 921                                 GError       **error)
 922 {
 923   GIOStream *ret;
 924   gchar **addr_array;
 925   guint n;
 926   GError *last_error;
 927
 928   g_return_val_if_fail (address != NULL, NULL);
 929   g_return_val_if_fail (error == NULL || *error == NULL, NULL);
 930
 931   ret = NULL;
 932   last_error = NULL;
 933
 934   addr_array = g_strsplit (address, ";", 0);
 935   if (addr_array[0] == NULL)
 936     {
 937       last_error = g_error_new_literal (G_IO_ERROR,
 938                                         G_IO_ERROR_INVALID_ARGUMENT,
 939                                         _("The given address is empty"));
 940       goto out;
 941     }
 942
 943   for (n = 0; addr_array != NULL && addr_array[n] != NULL; n++)
 944     {
 945       const gchar *addr = addr_array[n];
 946       GError *this_error;
 947
 948       this_error = NULL;
 949       ret = g_dbus_address_try_connect_one (addr,
 950                                             out_guid,
 951                                             cancellable,
 952                                             &this_error);
 953       if (ret != NULL)
 954         {
 955           goto out;
 956         }
 957       else
 958         {
 959           g_assert (this_error != NULL);
 960           if (last_error != NULL)
 961             g_error_free (last_error);
 962           last_error = this_error;
 963         }
 964     }
 965
 966  out:
 967   if (ret != NULL)
 968     {
 969       if (last_error != NULL)
 970         g_error_free (last_error);
 971     }
 972   else
 973     {
 974       g_assert (last_error != NULL);
 975       g_propagate_error (error, last_error);
 976     }
 977
 978   g_strfreev (addr_array);
 979   return ret;
 980 }
 981
 982 /* ---------------------------------------------------------------------------------------------------- */
 983
 984 #ifdef G_OS_UNIX
 985 static gchar *
 986 get_session_address_dbus_launch (GError **error)
 987 {
 988   gchar *ret;
 989   gchar *machine_id;
 990   gchar *command_line;
 991   gchar *launch_stdout;
 992   gchar *launch_stderr;
 993   gint exit_status;
 994   gchar *old_dbus_verbose;
 995   gboolean restore_dbus_verbose;
 996
 997   ret = NULL;
 998   machine_id = NULL;
 999   command_line = NULL;
1000   launch_stdout = NULL;
1001   launch_stderr = NULL;
1002   restore_dbus_verbose = FALSE;
1003   old_dbus_verbose = NULL;
1004
1005   machine_id = _g_dbus_get_machine_id (error);
1006   if (machine_id == NULL)
1007     {
1008       g_prefix_error (error, _("Cannot spawn a message bus without a machine-id: "));
1009       goto out;
1010     }
1011
1012   /* We're using private libdbus facilities here. When everything
1013    * (X11, Mac OS X, Windows) is spec'ed out correctly (not even the
1014    * X11 property is correctly documented right now) we should
1015    * consider using the spec instead of dbus-launch.
1016    *
1017    *   --autolaunch=MACHINEID
1018    *          This option implies that dbus-launch should scan  for  a  previ‐
1019    *          ously-started  session  and  reuse the values found there. If no
1020    *          session is found, it will start a new session. The  --exit-with-
1021    *          session option is implied if --autolaunch is given.  This option
1022    *          is for the exclusive use of libdbus, you do not want to  use  it
1023    *          manually. It may change in the future.
1024    */
1025
1026   /* TODO: maybe provide a variable for where to look for the dbus-launch binary? */
1027   command_line = g_strdup_printf ("dbus-launch --autolaunch=%s --binary-syntax --close-stderr", machine_id);
1028
1029   if (G_UNLIKELY (_g_dbus_debug_address ()))
1030     {
1031       _g_dbus_debug_print_lock ();
1032       g_print ("GDBus-debug:Address: Running `%s' to get bus address (possibly autolaunching)\n", command_line);
1033       old_dbus_verbose = g_strdup (g_getenv ("DBUS_VERBOSE"));
1034       restore_dbus_verbose = TRUE;
1035       g_setenv ("DBUS_VERBOSE", "1", TRUE);
1036       _g_dbus_debug_print_unlock ();
1037     }
1038
1039   if (!g_spawn_command_line_sync (command_line,
1040                                   &launch_stdout,
1041                                   &launch_stderr,
1042                                   &exit_status,
1043                                   error))
1044     {
1045       g_prefix_error (error, _("Error spawning command line `%s': "), command_line);
1046       goto out;
1047     }
1048
1049   if (!WIFEXITED (exit_status))
1050     {
1051       gchar *escaped_stderr;
1052       escaped_stderr = g_strescape (launch_stderr, "");
1053       g_set_error (error,
1054                    G_IO_ERROR,
1055                    G_IO_ERROR_FAILED,
1056                    _("Abnormal program termination spawning command line `%s': %s"),
1057                    command_line,
1058                    escaped_stderr);
1059       g_free (escaped_stderr);
1060       goto out;
1061     }
1062
1063   if (WEXITSTATUS (exit_status) != 0)
1064     {
1065       gchar *escaped_stderr;
1066       escaped_stderr = g_strescape (launch_stderr, "");
1067       g_set_error (error,
1068                    G_IO_ERROR,
1069                    G_IO_ERROR_FAILED,
1070                    _("Command line `%s' exited with non-zero exit status %d: %s"),
1071                    command_line,
1072                    WEXITSTATUS (exit_status),
1073                    escaped_stderr);
1074       g_free (escaped_stderr);
1075       goto out;
1076     }
1077
1078   /* From the dbus-launch(1) man page:
1079    *
1080    *   --binary-syntax Write to stdout a nul-terminated bus address,
1081    *   then the bus PID as a binary integer of size sizeof(pid_t),
1082    *   then the bus X window ID as a binary integer of size
1083    *   sizeof(long).  Integers are in the machine's byte order, not
1084    *   network byte order or any other canonical byte order.
1085    */
1086   ret = g_strdup (launch_stdout);
1087
1088  out:
1089   if (G_UNLIKELY (_g_dbus_debug_address ()))
1090     {
1091       gchar *s;
1092       _g_dbus_debug_print_lock ();
1093       g_print ("GDBus-debug:Address: dbus-launch output:");
1094       if (launch_stdout != NULL)
1095         {
1096           s = _g_dbus_hexdump (launch_stdout, strlen (launch_stdout) + 1 + sizeof (pid_t) + sizeof (long), 2);
1097           g_print ("\n%s", s);
1098           g_free (s);
1099         }
1100       else
1101         {
1102           g_print (" (none)\n");
1103         }
1104       g_print ("GDBus-debug:Address: dbus-launch stderr output:");
1105       if (launch_stderr != NULL)
1106         g_print ("\n%s", launch_stderr);
1107       else
1108         g_print (" (none)\n");
1109       _g_dbus_debug_print_unlock ();
1110     }
1111
1112   g_free (machine_id);
1113   g_free (command_line);
1114   g_free (launch_stdout);
1115   g_free (launch_stderr);
1116   if (G_UNLIKELY (restore_dbus_verbose))
1117     {
1118       if (old_dbus_verbose != NULL)
1119         g_setenv ("DBUS_VERBOSE", old_dbus_verbose, TRUE);
1120       else
1121         g_unsetenv ("DBUS_VERBOSE");
1122     }
1123   g_free (old_dbus_verbose);
1124   return ret;
1125 }
1126 #endif
1127
1128 /* ---------------------------------------------------------------------------------------------------- */
1129
1130 static gchar *
1131 get_session_address_platform_specific (GError **error)
1132 {
1133   gchar *ret;
1134 #ifdef G_OS_UNIX
1135   /* need to handle OS X in a different way since `dbus-launch --autolaunch' probably won't work there */
1136   ret = get_session_address_dbus_launch (error);
1137 #else
1138   /* TODO: implement for UNIX, Win32 and OS X */
1139   ret = NULL;
1140   g_set_error (error,
1141                G_IO_ERROR,
1142                G_IO_ERROR_FAILED,
1143                _("Cannot determine session bus address (not implemented for this OS)"));
1144 #endif
1145   return ret;
1146 }
1147
1148 /* ---------------------------------------------------------------------------------------------------- */
1149
1150 /**
1151  * g_dbus_address_get_for_bus_sync:
1152  * @bus_type: A #GBusType.
1153  * @cancellable: A #GCancellable or %NULL.
1154  * @error: Return location for error or %NULL.
1155  *
1156  * Synchronously looks up the D-Bus address for the well-known message
1157  * bus instance specified by @bus_type. This may involve using various
1158  * platform specific mechanisms.
1159  *
1160  * Returns: A valid D-Bus address string for @bus_type or %NULL if @error is set.
1161  *
1162  * Since: 2.26
1163  */
1164 gchar *
1165 g_dbus_address_get_for_bus_sync (GBusType       bus_type,
1166                                  GCancellable  *cancellable,
1167                                  GError       **error)
1168 {
1169   gchar *ret;
1170   const gchar *starter_bus;
1171   GError *local_error;
1172
1173   g_return_val_if_fail (error == NULL || *error == NULL, NULL);
1174
1175   ret = NULL;
1176   local_error = NULL;
1177
1178   if (G_UNLIKELY (_g_dbus_debug_address ()))
1179     {
1180       guint n;
1181       _g_dbus_debug_print_lock ();
1182       g_print ("GDBus-debug:Address: In g_dbus_address_get_for_bus_sync() for bus type `%s'\n",
1183                _g_dbus_enum_to_string (G_TYPE_BUS_TYPE, bus_type));
1184       for (n = 0; n < 3; n++)
1185         {
1186           const gchar *k;
1187           const gchar *v;
1188           switch (n)
1189             {
1190             case 0: k = "DBUS_SESSION_BUS_ADDRESS"; break;
1191             case 1: k = "DBUS_SYSTEM_BUS_ADDRESS"; break;
1192             case 2: k = "DBUS_STARTER_BUS_TYPE"; break;
1193             default: g_assert_not_reached ();
1194             }
1195           v = g_getenv (k);
1196           g_print ("GDBus-debug:Address: env var %s", k);
1197           if (v != NULL)
1198             g_print ("=`%s'\n", v);
1199           else
1200             g_print (" is not set\n");
1201         }
1202       _g_dbus_debug_print_unlock ();
1203     }
1204
1205   switch (bus_type)
1206     {
1207     case G_BUS_TYPE_SYSTEM:
1208       ret = g_strdup (g_getenv ("DBUS_SYSTEM_BUS_ADDRESS"));
1209       if (ret == NULL)
1210         {
1211           ret = g_strdup ("unix:path=/var/run/dbus/system_bus_socket");
1212         }
1213       break;
1214
1215     case G_BUS_TYPE_SESSION:
1216       ret = g_strdup (g_getenv ("DBUS_SESSION_BUS_ADDRESS"));
1217       if (ret == NULL)
1218         {
1219           ret = get_session_address_platform_specific (&local_error);
1220         }
1221       break;
1222
1223     case G_BUS_TYPE_STARTER:
1224       starter_bus = g_getenv ("DBUS_STARTER_BUS_TYPE");
1225       if (g_strcmp0 (starter_bus, "session") == 0)
1226         {
1227           ret = g_dbus_address_get_for_bus_sync (G_BUS_TYPE_SESSION, cancellable, &local_error);
1228           goto out;
1229         }
1230       else if (g_strcmp0 (starter_bus, "system") == 0)
1231         {
1232           ret = g_dbus_address_get_for_bus_sync (G_BUS_TYPE_SYSTEM, cancellable, &local_error);
1233           goto out;
1234         }
1235       else
1236         {
1237           if (starter_bus != NULL)
1238             {
1239               g_set_error (&local_error,
1240                            G_IO_ERROR,
1241                            G_IO_ERROR_FAILED,
1242                            _("Cannot determine bus address from DBUS_STARTER_BUS_TYPE environment variable"
1243                              " - unknown value `%s'"),
1244                            starter_bus);
1245             }
1246           else
1247             {
1248               g_set_error_literal (&local_error,
1249                                    G_IO_ERROR,
1250                                    G_IO_ERROR_FAILED,
1251                                    _("Cannot determine bus address because the DBUS_STARTER_BUS_TYPE environment "
1252                                      "variable is not set"));
1253             }
1254         }
1255       break;
1256
1257     default:
1258       g_set_error (&local_error,
1259                    G_IO_ERROR,
1260                    G_IO_ERROR_FAILED,
1261                    _("Unknown bus type %d"),
1262                    bus_type);
1263       break;
1264     }
1265
1266  out:
1267   if (G_UNLIKELY (_g_dbus_debug_address ()))
1268     {
1269       _g_dbus_debug_print_lock ();
1270       if (ret != NULL)
1271         {
1272           g_print ("GDBus-debug:Address: Returning address `%s' for bus type `%s'\n",
1273                    ret,
1274                    _g_dbus_enum_to_string (G_TYPE_BUS_TYPE, bus_type));
1275         }
1276       else
1277         {
1278           g_print ("GDBus-debug:Address: Cannot look-up address bus type `%s': %s\n",
1279                    _g_dbus_enum_to_string (G_TYPE_BUS_TYPE, bus_type),
1280                    local_error->message);
1281         }
1282       _g_dbus_debug_print_unlock ();
1283     }
1284
1285   if (local_error != NULL)
1286     g_propagate_error (error, local_error);
1287
1288   return ret;
1289 }