gio/gresolver.c

   1 /* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
   2
   3 /* GIO - GLib Input, Output and Streaming Library
   4  *
   5  * Copyright (C) 2008 Red Hat, Inc.
   6  *
   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 of the License, or (at your option) any later version.
  11  *
  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.
  16  *
  17  * You should have received a copy of the GNU Lesser General
  18  * Public License along with this library; if not, write to the
  19  * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
  20  * Boston, MA 02111-1307, USA.
  21  */
  22
  23 #include "config.h"
  24 #include <glib.h>
  25 #include "glibintl.h"
  26
  27 #include "gresolver.h"
  28 #include "gnetworkingprivate.h"
  29 #include "gasyncresult.h"
  30 #include "ginetaddress.h"
  31 #include "ginetsocketaddress.h"
  32 #include "gsimpleasyncresult.h"
  33 #include "gsrvtarget.h"
  34 #include "gthreadedresolver.h"
  35
  36 #ifdef G_OS_UNIX
  37 #include <sys/stat.h>
  38 #endif
  39
  40 #include <stdlib.h>
  41
  42
  43 /**
  44  * SECTION:gresolver
  45  * @short_description: Asynchronous and cancellable DNS resolver
  46  * @include: gio/gio.h
  47  *
  48  * #GResolver provides cancellable synchronous and asynchronous DNS
  49  * resolution, for hostnames (g_resolver_lookup_by_address(),
  50  * g_resolver_lookup_by_name() and their async variants) and SRV
  51  * (service) records (g_resolver_lookup_service()).
  52  *
  53  * #GNetworkAddress and #GNetworkService provide wrappers around
  54  * #GResolver functionality that also implement #GSocketConnectable,
  55  * making it easy to connect to a remote host/service.
  56  */
  57
  58 enum {
  59   RELOAD,
  60   LAST_SIGNAL
  61 };
  62
  63 static guint signals[LAST_SIGNAL] = { 0 };
  64
  65 struct _GResolverPrivate {
  66 #ifdef G_OS_UNIX
  67   time_t resolv_conf_timestamp;
  68 #else
  69   int dummy;
  70 #endif
  71 };
  72
  73 /**
  74  * GResolver:
  75  *
  76  * The object that handles DNS resolution. Use g_resolver_get_default()
  77  * to get the default resolver.
  78  */
  79 G_DEFINE_TYPE (GResolver, g_resolver, G_TYPE_OBJECT)
  80
  81 static GList *
  82 srv_records_to_targets (GList *records)
  83 {
  84   const gchar *hostname;
  85   guint16 port, priority, weight;
  86   GSrvTarget *target;
  87   GList *l;
  88
  89   for (l = records; l != NULL; l = g_list_next (l))
  90     {
  91       g_variant_get (l->data, "(qqq&s)", &priority, &weight, &port, &hostname);
  92       target = g_srv_target_new (hostname, port, priority, weight);
  93       g_variant_unref (l->data);
  94       l->data = target;
  95     }
  96
  97   return g_srv_target_list_sort (records);
  98 }
  99
 100 static GList *
 101 g_resolver_real_lookup_service (GResolver            *resolver,
 102                                 const gchar          *rrname,
 103                                 GCancellable         *cancellable,
 104                                 GError              **error)
 105 {
 106   GList *records;
 107
 108   records = G_RESOLVER_GET_CLASS (resolver)->lookup_records (resolver,
 109                                                              rrname,
 110                                                              G_RESOLVER_RECORD_SRV,
 111                                                              cancellable,
 112                                                              error);
 113
 114   return srv_records_to_targets (records);
 115 }
 116
 117 static void
 118 g_resolver_real_lookup_service_async (GResolver            *resolver,
 119                                       const gchar          *rrname,
 120                                       GCancellable         *cancellable,
 121                                       GAsyncReadyCallback   callback,
 122                                       gpointer              user_data)
 123 {
 124   G_RESOLVER_GET_CLASS (resolver)->lookup_records_async (resolver,
 125                                                          rrname,
 126                                                          G_RESOLVER_RECORD_SRV,
 127                                                          cancellable,
 128                                                          callback,
 129                                                          user_data);
 130 }
 131
 132 static GList *
 133 g_resolver_real_lookup_service_finish (GResolver            *resolver,
 134                                        GAsyncResult         *result,
 135                                        GError              **error)
 136 {
 137   GList *records;
 138
 139   records = G_RESOLVER_GET_CLASS (resolver)->lookup_records_finish (resolver,
 140                                                                     result,
 141                                                                     error);
 142
 143   return srv_records_to_targets (records);
 144 }
 145
 146 static void
 147 g_resolver_class_init (GResolverClass *resolver_class)
 148 {
 149   /* Automatically pass these over to the lookup_records methods */
 150   resolver_class->lookup_service = g_resolver_real_lookup_service;
 151   resolver_class->lookup_service_async = g_resolver_real_lookup_service_async;
 152   resolver_class->lookup_service_finish = g_resolver_real_lookup_service_finish;
 153
 154   g_type_class_add_private (resolver_class, sizeof (GResolverPrivate));
 155
 156   /* Make sure _g_networking_init() has been called */
 157   g_type_ensure (G_TYPE_INET_ADDRESS);
 158
 159   /* Initialize _g_resolver_addrinfo_hints */
 160 #ifdef AI_ADDRCONFIG
 161   _g_resolver_addrinfo_hints.ai_flags |= AI_ADDRCONFIG;
 162 #endif
 163   /* These two don't actually matter, they just get copied into the
 164    * returned addrinfo structures (and then we ignore them). But if
 165    * we leave them unset, we'll get back duplicate answers.
 166    */
 167   _g_resolver_addrinfo_hints.ai_socktype = SOCK_STREAM;
 168   _g_resolver_addrinfo_hints.ai_protocol = IPPROTO_TCP;
 169
 170   /**
 171    * GResolver::reload:
 172    * @resolver: a #GResolver
 173    *
 174    * Emitted when the resolver notices that the system resolver
 175    * configuration has changed.
 176    **/
 177   signals[RELOAD] =
 178     g_signal_new (I_("reload"),
 179                   G_TYPE_RESOLVER,
 180                   G_SIGNAL_RUN_LAST,
 181                   G_STRUCT_OFFSET (GResolverClass, reload),
 182                   NULL, NULL,
 183                   g_cclosure_marshal_VOID__VOID,
 184                   G_TYPE_NONE, 0);
 185 }
 186
 187 static void
 188 g_resolver_init (GResolver *resolver)
 189 {
 190 #ifdef G_OS_UNIX
 191   struct stat st;
 192 #endif
 193
 194   resolver->priv = G_TYPE_INSTANCE_GET_PRIVATE (resolver, G_TYPE_RESOLVER, GResolverPrivate);
 195
 196 #ifdef G_OS_UNIX
 197   if (stat (_PATH_RESCONF, &st) == 0)
 198     resolver->priv->resolv_conf_timestamp = st.st_mtime;
 199 #endif
 200 }
 201
 202 static GResolver *default_resolver;
 203
 204 /**
 205  * g_resolver_get_default:
 206  *
 207  * Gets the default #GResolver. You should unref it when you are done
 208  * with it. #GResolver may use its reference count as a hint about how
 209  * many threads it should allocate for concurrent DNS resolutions.
 210  *
 211  * Return value: (transfer full): the default #GResolver.
 212  *
 213  * Since: 2.22
 214  */
 215 GResolver *
 216 g_resolver_get_default (void)
 217 {
 218   if (!default_resolver)
 219     default_resolver = g_object_new (G_TYPE_THREADED_RESOLVER, NULL);
 220
 221   return g_object_ref (default_resolver);
 222 }
 223
 224 /**
 225  * g_resolver_set_default:
 226  * @resolver: the new default #GResolver
 227  *
 228  * Sets @resolver to be the application's default resolver (reffing
 229  * @resolver, and unreffing the previous default resolver, if any).
 230  * Future calls to g_resolver_get_default() will return this resolver.
 231  *
 232  * This can be used if an application wants to perform any sort of DNS
 233  * caching or "pinning"; it can implement its own #GResolver that
 234  * calls the original default resolver for DNS operations, and
 235  * implements its own cache policies on top of that, and then set
 236  * itself as the default resolver for all later code to use.
 237  *
 238  * Since: 2.22
 239  */
 240 void
 241 g_resolver_set_default (GResolver *resolver)
 242 {
 243   if (default_resolver)
 244     g_object_unref (default_resolver);
 245   default_resolver = g_object_ref (resolver);
 246 }
 247
 248
 249 static void
 250 g_resolver_maybe_reload (GResolver *resolver)
 251 {
 252 #ifdef G_OS_UNIX
 253   struct stat st;
 254
 255   if (stat (_PATH_RESCONF, &st) == 0)
 256     {
 257       if (st.st_mtime != resolver->priv->resolv_conf_timestamp)
 258         {
 259           resolver->priv->resolv_conf_timestamp = st.st_mtime;
 260           res_init ();
 261           g_signal_emit (resolver, signals[RELOAD], 0);
 262         }
 263     }
 264 #endif
 265 }
 266
 267 /* filter out duplicates, cf. https://bugzilla.gnome.org/show_bug.cgi?id=631379 */
 268 static void
 269 remove_duplicates (GList *addrs)
 270 {
 271   GList *l;
 272   GList *ll;
 273   GList *lll;
 274
 275   /* TODO: if this is too slow (it's O(n^2) but n is typically really
 276    * small), we can do something more clever but note that we must not
 277    * change the order of elements...
 278    */
 279   for (l = addrs; l != NULL; l = l->next)
 280     {
 281       GInetAddress *address = G_INET_ADDRESS (l->data);
 282       for (ll = l->next; ll != NULL; ll = lll)
 283         {
 284           GInetAddress *other_address = G_INET_ADDRESS (ll->data);
 285           lll = ll->next;
 286           if (g_inet_address_equal (address, other_address))
 287             {
 288               g_object_unref (other_address);
 289               /* we never return the first element */
 290               g_warn_if_fail (g_list_delete_link (addrs, ll) == addrs);
 291             }
 292         }
 293     }
 294 }
 295
 296
 297 /**
 298  * g_resolver_lookup_by_name:
 299  * @resolver: a #GResolver
 300  * @hostname: the hostname to look up
 301  * @cancellable: (allow-none): a #GCancellable, or %NULL
 302  * @error: return location for a #GError, or %NULL
 303  *
 304  * Synchronously resolves @hostname to determine its associated IP
 305  * address(es). @hostname may be an ASCII-only or UTF-8 hostname, or
 306  * the textual form of an IP address (in which case this just becomes
 307  * a wrapper around g_inet_address_new_from_string()).
 308  *
 309  * On success, g_resolver_lookup_by_name() will return a #GList of
 310  * #GInetAddress, sorted in order of preference and guaranteed to not
 311  * contain duplicates. That is, if using the result to connect to
 312  * @hostname, you should attempt to connect to the first address
 313  * first, then the second if the first fails, etc. If you are using
 314  * the result to listen on a socket, it is appropriate to add each
 315  * result using e.g. g_socket_listener_add_address().
 316  *
 317  * If the DNS resolution fails, @error (if non-%NULL) will be set to a
 318  * value from #GResolverError.
 319  *
 320  * If @cancellable is non-%NULL, it can be used to cancel the
 321  * operation, in which case @error (if non-%NULL) will be set to
 322  * %G_IO_ERROR_CANCELLED.
 323  *
 324  * If you are planning to connect to a socket on the resolved IP
 325  * address, it may be easier to create a #GNetworkAddress and use its
 326  * #GSocketConnectable interface.
 327  *
 328  * Return value: (element-type GInetAddress) (transfer full): a #GList
 329  * of #GInetAddress, or %NULL on error. You
 330  * must unref each of the addresses and free the list when you are
 331  * done with it. (You can use g_resolver_free_addresses() to do this.)
 332  *
 333  * Since: 2.22
 334  */
 335 GList *
 336 g_resolver_lookup_by_name (GResolver     *resolver,
 337                            const gchar   *hostname,
 338                            GCancellable  *cancellable,
 339                            GError       **error)
 340 {
 341   GInetAddress *addr;
 342   GList *addrs;
 343   gchar *ascii_hostname = NULL;
 344
 345   g_return_val_if_fail (G_IS_RESOLVER (resolver), NULL);
 346   g_return_val_if_fail (hostname != NULL, NULL);
 347
 348   /* Check if @hostname is just an IP address */
 349   addr = g_inet_address_new_from_string (hostname);
 350   if (addr)
 351     return g_list_append (NULL, addr);
 352
 353   if (g_hostname_is_non_ascii (hostname))
 354     hostname = ascii_hostname = g_hostname_to_ascii (hostname);
 355
 356   g_resolver_maybe_reload (resolver);
 357   addrs = G_RESOLVER_GET_CLASS (resolver)->
 358     lookup_by_name (resolver, hostname, cancellable, error);
 359
 360   remove_duplicates (addrs);
 361
 362   g_free (ascii_hostname);
 363   return addrs;
 364 }
 365
 366 /**
 367  * g_resolver_lookup_by_name_async:
 368  * @resolver: a #GResolver
 369  * @hostname: the hostname to look up the address of
 370  * @cancellable: (allow-none): a #GCancellable, or %NULL
 371  * @callback: (scope async): callback to call after resolution completes
 372  * @user_data: (closure): data for @callback
 373  *
 374  * Begins asynchronously resolving @hostname to determine its
 375  * associated IP address(es), and eventually calls @callback, which
 376  * must call g_resolver_lookup_by_name_finish() to get the result.
 377  * See g_resolver_lookup_by_name() for more details.
 378  *
 379  * Since: 2.22
 380  */
 381 void
 382 g_resolver_lookup_by_name_async (GResolver           *resolver,
 383                                  const gchar         *hostname,
 384                                  GCancellable        *cancellable,
 385                                  GAsyncReadyCallback  callback,
 386                                  gpointer             user_data)
 387 {
 388   GInetAddress *addr;
 389   gchar *ascii_hostname = NULL;
 390
 391   g_return_if_fail (G_IS_RESOLVER (resolver));
 392   g_return_if_fail (hostname != NULL);
 393
 394   /* Check if @hostname is just an IP address */
 395   addr = g_inet_address_new_from_string (hostname);
 396   if (addr)
 397     {
 398       GSimpleAsyncResult *simple;
 399
 400       simple = g_simple_async_result_new (G_OBJECT (resolver),
 401                                           callback, user_data,
 402                                           g_resolver_lookup_by_name_async);
 403
 404       g_simple_async_result_set_op_res_gpointer (simple, addr, g_object_unref);
 405       g_simple_async_result_complete_in_idle (simple);
 406       g_object_unref (simple);
 407       return;
 408     }
 409
 410   if (g_hostname_is_non_ascii (hostname))
 411     hostname = ascii_hostname = g_hostname_to_ascii (hostname);
 412
 413   g_resolver_maybe_reload (resolver);
 414   G_RESOLVER_GET_CLASS (resolver)->
 415     lookup_by_name_async (resolver, hostname, cancellable, callback, user_data);
 416
 417   g_free (ascii_hostname);
 418 }
 419
 420 /**
 421  * g_resolver_lookup_by_name_finish:
 422  * @resolver: a #GResolver
 423  * @result: the result passed to your #GAsyncReadyCallback
 424  * @error: return location for a #GError, or %NULL
 425  *
 426  * Retrieves the result of a call to
 427  * g_resolver_lookup_by_name_async().
 428  *
 429  * If the DNS resolution failed, @error (if non-%NULL) will be set to
 430  * a value from #GResolverError. If the operation was cancelled,
 431  * @error will be set to %G_IO_ERROR_CANCELLED.
 432  *
 433  * Return value: (element-type GInetAddress) (transfer full): a #GList
 434  * of #GInetAddress, or %NULL on error. See g_resolver_lookup_by_name()
 435  * for more details.
 436  *
 437  * Since: 2.22
 438  */
 439 GList *
 440 g_resolver_lookup_by_name_finish (GResolver     *resolver,
 441                                   GAsyncResult  *result,
 442                                   GError       **error)
 443 {
 444   GList *addrs;
 445
 446   g_return_val_if_fail (G_IS_RESOLVER (resolver), NULL);
 447
 448   if (g_async_result_legacy_propagate_error (result, error))
 449     return NULL;
 450   else if (g_async_result_is_tagged (result, g_resolver_lookup_by_name_async))
 451     {
 452       GSimpleAsyncResult *simple = G_SIMPLE_ASYNC_RESULT (result);
 453       GInetAddress *addr;
 454
 455       /* Handle the stringified-IP-addr case */
 456       addr = g_simple_async_result_get_op_res_gpointer (simple);
 457       return g_list_append (NULL, g_object_ref (addr));
 458     }
 459
 460   addrs = G_RESOLVER_GET_CLASS (resolver)->
 461     lookup_by_name_finish (resolver, result, error);
 462
 463   remove_duplicates (addrs);
 464
 465   return addrs;
 466 }
 467
 468 /**
 469  * g_resolver_free_addresses: (skip)
 470  * @addresses: a #GList of #GInetAddress
 471  *
 472  * Frees @addresses (which should be the return value from
 473  * g_resolver_lookup_by_name() or g_resolver_lookup_by_name_finish()).
 474  * (This is a convenience method; you can also simply free the results
 475  * by hand.)
 476  *
 477  * Since: 2.22
 478  */
 479 void
 480 g_resolver_free_addresses (GList *addresses)
 481 {
 482   GList *a;
 483
 484   for (a = addresses; a; a = a->next)
 485     g_object_unref (a->data);
 486   g_list_free (addresses);
 487 }
 488
 489 /**
 490  * g_resolver_lookup_by_address:
 491  * @resolver: a #GResolver
 492  * @address: the address to reverse-resolve
 493  * @cancellable: (allow-none): a #GCancellable, or %NULL
 494  * @error: return location for a #GError, or %NULL
 495  *
 496  * Synchronously reverse-resolves @address to determine its
 497  * associated hostname.
 498  *
 499  * If the DNS resolution fails, @error (if non-%NULL) will be set to
 500  * a value from #GResolverError.
 501  *
 502  * If @cancellable is non-%NULL, it can be used to cancel the
 503  * operation, in which case @error (if non-%NULL) will be set to
 504  * %G_IO_ERROR_CANCELLED.
 505  *
 506  * Return value: a hostname (either ASCII-only, or in ASCII-encoded
 507  *     form), or %NULL on error.
 508  *
 509  * Since: 2.22
 510  */
 511 gchar *
 512 g_resolver_lookup_by_address (GResolver     *resolver,
 513                               GInetAddress  *address,
 514                               GCancellable  *cancellable,
 515                               GError       **error)
 516 {
 517   g_return_val_if_fail (G_IS_RESOLVER (resolver), NULL);
 518   g_return_val_if_fail (G_IS_INET_ADDRESS (address), NULL);
 519
 520   g_resolver_maybe_reload (resolver);
 521   return G_RESOLVER_GET_CLASS (resolver)->
 522     lookup_by_address (resolver, address, cancellable, error);
 523 }
 524
 525 /**
 526  * g_resolver_lookup_by_address_async:
 527  * @resolver: a #GResolver
 528  * @address: the address to reverse-resolve
 529  * @cancellable: (allow-none): a #GCancellable, or %NULL
 530  * @callback: (scope async): callback to call after resolution completes
 531  * @user_data: (closure): data for @callback
 532  *
 533  * Begins asynchronously reverse-resolving @address to determine its
 534  * associated hostname, and eventually calls @callback, which must
 535  * call g_resolver_lookup_by_address_finish() to get the final result.
 536  *
 537  * Since: 2.22
 538  */
 539 void
 540 g_resolver_lookup_by_address_async (GResolver           *resolver,
 541                                     GInetAddress        *address,
 542                                     GCancellable        *cancellable,
 543                                     GAsyncReadyCallback  callback,
 544                                     gpointer             user_data)
 545 {
 546   g_return_if_fail (G_IS_RESOLVER (resolver));
 547   g_return_if_fail (G_IS_INET_ADDRESS (address));
 548
 549   g_resolver_maybe_reload (resolver);
 550   G_RESOLVER_GET_CLASS (resolver)->
 551     lookup_by_address_async (resolver, address, cancellable, callback, user_data);
 552 }
 553
 554 /**
 555  * g_resolver_lookup_by_address_finish:
 556  * @resolver: a #GResolver
 557  * @result: the result passed to your #GAsyncReadyCallback
 558  * @error: return location for a #GError, or %NULL
 559  *
 560  * Retrieves the result of a previous call to
 561  * g_resolver_lookup_by_address_async().
 562  *
 563  * If the DNS resolution failed, @error (if non-%NULL) will be set to
 564  * a value from #GResolverError. If the operation was cancelled,
 565  * @error will be set to %G_IO_ERROR_CANCELLED.
 566  *
 567  * Return value: a hostname (either ASCII-only, or in ASCII-encoded
 568  * form), or %NULL on error.
 569  *
 570  * Since: 2.22
 571  */
 572 gchar *
 573 g_resolver_lookup_by_address_finish (GResolver     *resolver,
 574                                      GAsyncResult  *result,
 575                                      GError       **error)
 576 {
 577   g_return_val_if_fail (G_IS_RESOLVER (resolver), NULL);
 578
 579   if (g_async_result_legacy_propagate_error (result, error))
 580     return NULL;
 581
 582   return G_RESOLVER_GET_CLASS (resolver)->
 583     lookup_by_address_finish (resolver, result, error);
 584 }
 585
 586 static gchar *
 587 g_resolver_get_service_rrname (const char *service,
 588                                const char *protocol,
 589                                const char *domain)
 590 {
 591   gchar *rrname, *ascii_domain = NULL;
 592
 593   if (g_hostname_is_non_ascii (domain))
 594     domain = ascii_domain = g_hostname_to_ascii (domain);
 595
 596   rrname = g_strdup_printf ("_%s._%s.%s", service, protocol, domain);
 597
 598   g_free (ascii_domain);
 599   return rrname;
 600 }
 601
 602 /**
 603  * g_resolver_lookup_service:
 604  * @resolver: a #GResolver
 605  * @service: the service type to look up (eg, "ldap")
 606  * @protocol: the networking protocol to use for @service (eg, "tcp")
 607  * @domain: the DNS domain to look up the service in
 608  * @cancellable: (allow-none): a #GCancellable, or %NULL
 609  * @error: return location for a #GError, or %NULL
 610  *
 611  * Synchronously performs a DNS SRV lookup for the given @service and
 612  * @protocol in the given @domain and returns an array of #GSrvTarget.
 613  * @domain may be an ASCII-only or UTF-8 hostname. Note also that the
 614  * @service and @protocol arguments <emphasis>do not</emphasis>
 615  * include the leading underscore that appears in the actual DNS
 616  * entry.
 617  *
 618  * On success, g_resolver_lookup_service() will return a #GList of
 619  * #GSrvTarget, sorted in order of preference. (That is, you should
 620  * attempt to connect to the first target first, then the second if
 621  * the first fails, etc.)
 622  *
 623  * If the DNS resolution fails, @error (if non-%NULL) will be set to
 624  * a value from #GResolverError.
 625  *
 626  * If @cancellable is non-%NULL, it can be used to cancel the
 627  * operation, in which case @error (if non-%NULL) will be set to
 628  * %G_IO_ERROR_CANCELLED.
 629  *
 630  * If you are planning to connect to the service, it is usually easier
 631  * to create a #GNetworkService and use its #GSocketConnectable
 632  * interface.
 633  *
 634  * Return value: (element-type GSrvTarget) (transfer full): a #GList of #GSrvTarget,
 635  * or %NULL on error. You must free each of the targets and the list when you are
 636  * done with it. (You can use g_resolver_free_targets() to do this.)
 637  *
 638  * Since: 2.22
 639  */
 640 GList *
 641 g_resolver_lookup_service (GResolver     *resolver,
 642                            const gchar   *service,
 643                            const gchar   *protocol,
 644                            const gchar   *domain,
 645                            GCancellable  *cancellable,
 646                            GError       **error)
 647 {
 648   GList *targets;
 649   gchar *rrname;
 650
 651   g_return_val_if_fail (G_IS_RESOLVER (resolver), NULL);
 652   g_return_val_if_fail (service != NULL, NULL);
 653   g_return_val_if_fail (protocol != NULL, NULL);
 654   g_return_val_if_fail (domain != NULL, NULL);
 655
 656   rrname = g_resolver_get_service_rrname (service, protocol, domain);
 657
 658   g_resolver_maybe_reload (resolver);
 659   targets = G_RESOLVER_GET_CLASS (resolver)->
 660     lookup_service (resolver, rrname, cancellable, error);
 661
 662   g_free (rrname);
 663   return targets;
 664 }
 665
 666 /**
 667  * g_resolver_lookup_service_async:
 668  * @resolver: a #GResolver
 669  * @service: the service type to look up (eg, "ldap")
 670  * @protocol: the networking protocol to use for @service (eg, "tcp")
 671  * @domain: the DNS domain to look up the service in
 672  * @cancellable: (allow-none): a #GCancellable, or %NULL
 673  * @callback: (scope async): callback to call after resolution completes
 674  * @user_data: (closure): data for @callback
 675  *
 676  * Begins asynchronously performing a DNS SRV lookup for the given
 677  * @service and @protocol in the given @domain, and eventually calls
 678  * @callback, which must call g_resolver_lookup_service_finish() to
 679  * get the final result. See g_resolver_lookup_service() for more
 680  * details.
 681  *
 682  * Since: 2.22
 683  */
 684 void
 685 g_resolver_lookup_service_async (GResolver           *resolver,
 686                                  const gchar         *service,
 687                                  const gchar         *protocol,
 688                                  const gchar         *domain,
 689                                  GCancellable        *cancellable,
 690                                  GAsyncReadyCallback  callback,
 691                                  gpointer             user_data)
 692 {
 693   gchar *rrname;
 694
 695   g_return_if_fail (G_IS_RESOLVER (resolver));
 696   g_return_if_fail (service != NULL);
 697   g_return_if_fail (protocol != NULL);
 698   g_return_if_fail (domain != NULL);
 699
 700   rrname = g_resolver_get_service_rrname (service, protocol, domain);
 701
 702   g_resolver_maybe_reload (resolver);
 703   G_RESOLVER_GET_CLASS (resolver)->
 704     lookup_service_async (resolver, rrname, cancellable, callback, user_data);
 705
 706   g_free (rrname);
 707 }
 708
 709 /**
 710  * g_resolver_lookup_service_finish:
 711  * @resolver: a #GResolver
 712  * @result: the result passed to your #GAsyncReadyCallback
 713  * @error: return location for a #GError, or %NULL
 714  *
 715  * Retrieves the result of a previous call to
 716  * g_resolver_lookup_service_async().
 717  *
 718  * If the DNS resolution failed, @error (if non-%NULL) will be set to
 719  * a value from #GResolverError. If the operation was cancelled,
 720  * @error will be set to %G_IO_ERROR_CANCELLED.
 721  *
 722  * Return value: (element-type GSrvTarget) (transfer full): a #GList of #GSrvTarget,
 723  * or %NULL on error. See g_resolver_lookup_service() for more details.
 724  *
 725  * Since: 2.22
 726  */
 727 GList *
 728 g_resolver_lookup_service_finish (GResolver     *resolver,
 729                                   GAsyncResult  *result,
 730                                   GError       **error)
 731 {
 732   g_return_val_if_fail (G_IS_RESOLVER (resolver), NULL);
 733
 734   if (g_async_result_legacy_propagate_error (result, error))
 735     return NULL;
 736
 737   return G_RESOLVER_GET_CLASS (resolver)->
 738     lookup_service_finish (resolver, result, error);
 739 }
 740
 741 /**
 742  * g_resolver_free_targets: (skip)
 743  * @targets: a #GList of #GSrvTarget
 744  *
 745  * Frees @targets (which should be the return value from
 746  * g_resolver_lookup_service() or g_resolver_lookup_service_finish()).
 747  * (This is a convenience method; you can also simply free the
 748  * results by hand.)
 749  *
 750  * Since: 2.22
 751  */
 752 void
 753 g_resolver_free_targets (GList *targets)
 754 {
 755   GList *t;
 756
 757   for (t = targets; t; t = t->next)
 758     g_srv_target_free (t->data);
 759   g_list_free (targets);
 760 }
 761
 762 /**
 763  * g_resolver_lookup_records:
 764  * @resolver: a #GResolver
 765  * @rrname: the DNS name to lookup the record for
 766  * @record_type: the type of DNS record to lookup
 767  * @cancellable: (allow-none): a #GCancellable, or %NULL
 768  * @error: return location for a #GError, or %NULL
 769  *
 770  * Synchronously performs a DNS record lookup for the given @rrname and returns
 771  * a list of records as #GVariant tuples. See #GResolverRecordType for
 772  * information on what the records contain for each @record_type.
 773  *
 774  * If the DNS resolution fails, @error (if non-%NULL) will be set to
 775  * a value from #GResolverError.
 776  *
 777  * If @cancellable is non-%NULL, it can be used to cancel the
 778  * operation, in which case @error (if non-%NULL) will be set to
 779  * %G_IO_ERROR_CANCELLED.
 780  *
 781  * Return value: (element-type GVariant) (transfer full): a #GList of #GVariant,
 782  * or %NULL on error. You must free each of the records and the list when you are
 783  * done with it. (You can use g_list_free_full() with g_variant_unref() to do this.)
 784  *
 785  * Since: 2.34
 786  */
 787 GList *
 788 g_resolver_lookup_records (GResolver            *resolver,
 789                            const gchar          *rrname,
 790                            GResolverRecordType   record_type,
 791                            GCancellable         *cancellable,
 792                            GError              **error)
 793 {
 794   GList *records;
 795
 796   g_return_val_if_fail (G_IS_RESOLVER (resolver), NULL);
 797   g_return_val_if_fail (rrname != NULL, NULL);
 798
 799   g_resolver_maybe_reload (resolver);
 800   records = G_RESOLVER_GET_CLASS (resolver)->
 801     lookup_records (resolver, rrname, record_type, cancellable, error);
 802
 803   return records;
 804 }
 805
 806 /**
 807  * g_resolver_lookup_records_async:
 808  * @resolver: a #GResolver
 809  * @rrname: the DNS name to lookup the record for
 810  * @record_type: the type of DNS record to lookup
 811  * @cancellable: (allow-none): a #GCancellable, or %NULL
 812  * @callback: (scope async): callback to call after resolution completes
 813  * @user_data: (closure): data for @callback
 814  *
 815  * Begins asynchronously performing a DNS lookup for the given
 816  * @rrname, and eventually calls @callback, which must call
 817  * g_resolver_lookup_records_finish() to get the final result. See
 818  * g_resolver_lookup_records() for more details.
 819  *
 820  * Since: 2.34
 821  */
 822 void
 823 g_resolver_lookup_records_async (GResolver           *resolver,
 824                                  const gchar         *rrname,
 825                                  GResolverRecordType  record_type,
 826                                  GCancellable        *cancellable,
 827                                  GAsyncReadyCallback  callback,
 828                                  gpointer             user_data)
 829 {
 830   g_return_if_fail (G_IS_RESOLVER (resolver));
 831   g_return_if_fail (rrname != NULL);
 832
 833   g_resolver_maybe_reload (resolver);
 834   G_RESOLVER_GET_CLASS (resolver)->
 835     lookup_records_async (resolver, rrname, record_type, cancellable, callback, user_data);
 836 }
 837
 838 /**
 839  * g_resolver_lookup_records_finish:
 840  * @resolver: a #GResolver
 841  * @result: the result passed to your #GAsyncReadyCallback
 842  * @error: return location for a #GError, or %NULL
 843  *
 844  * Retrieves the result of a previous call to
 845  * g_resolver_lookup_records_async(). Returns a list of records as #GVariant
 846  * tuples. See #GResolverRecordType for information on what the records contain.
 847  *
 848  * If the DNS resolution failed, @error (if non-%NULL) will be set to
 849  * a value from #GResolverError. If the operation was cancelled,
 850  * @error will be set to %G_IO_ERROR_CANCELLED.
 851  *
 852  * Return value: (element-type GVariant) (transfer full): a #GList of #GVariant,
 853  * or %NULL on error. You must free each of the records and the list when you are
 854  * done with it. (You can use g_list_free_full() with g_variant_unref() to do this.)
 855  *
 856  * Since: 2.34
 857  */
 858 GList *
 859 g_resolver_lookup_records_finish (GResolver     *resolver,
 860                                   GAsyncResult  *result,
 861                                   GError       **error)
 862 {
 863   g_return_val_if_fail (G_IS_RESOLVER (resolver), NULL);
 864   return G_RESOLVER_GET_CLASS (resolver)->
 865     lookup_records_finish (resolver, result, error);
 866 }
 867
 868 /**
 869  * g_resolver_error_quark:
 870  *
 871  * Gets the #GResolver Error Quark.
 872  *
 873  * Return value: a #GQuark.
 874  *
 875  * Since: 2.22
 876  */
 877 G_DEFINE_QUARK (g-resolver-error-quark, g_resolver_error)
 878
 879 static GResolverError
 880 g_resolver_error_from_addrinfo_error (gint err)
 881 {
 882   switch (err)
 883     {
 884     case EAI_FAIL:
 885 #if defined(EAI_NODATA) && (EAI_NODATA != EAI_NONAME)
 886     case EAI_NODATA:
 887 #endif
 888     case EAI_NONAME:
 889       return G_RESOLVER_ERROR_NOT_FOUND;
 890
 891     case EAI_AGAIN:
 892       return G_RESOLVER_ERROR_TEMPORARY_FAILURE;
 893
 894     default:
 895       return G_RESOLVER_ERROR_INTERNAL;
 896     }
 897 }
 898
 899 struct addrinfo _g_resolver_addrinfo_hints;
 900
 901 /* Private method to process a getaddrinfo() response. */
 902 GList *
 903 _g_resolver_addresses_from_addrinfo (const char       *hostname,
 904                                      struct addrinfo  *res,
 905                                      gint              gai_retval,
 906                                      GError          **error)
 907 {
 908   struct addrinfo *ai;
 909   GSocketAddress *sockaddr;
 910   GInetAddress *addr;
 911   GList *addrs;
 912
 913   if (gai_retval != 0)
 914     {
 915       g_set_error (error, G_RESOLVER_ERROR,
 916                    g_resolver_error_from_addrinfo_error (gai_retval),
 917                    _("Error resolving '%s': %s"),
 918                    hostname, gai_strerror (gai_retval));
 919       return NULL;
 920     }
 921
 922   g_return_val_if_fail (res != NULL, NULL);
 923
 924   addrs = NULL;
 925   for (ai = res; ai; ai = ai->ai_next)
 926     {
 927       sockaddr = g_socket_address_new_from_native (ai->ai_addr, ai->ai_addrlen);
 928       if (!sockaddr || !G_IS_INET_SOCKET_ADDRESS (sockaddr))
 929         continue;
 930
 931       addr = g_object_ref (g_inet_socket_address_get_address ((GInetSocketAddress *)sockaddr));
 932       addrs = g_list_prepend (addrs, addr);
 933       g_object_unref (sockaddr);
 934     }
 935
 936   return g_list_reverse (addrs);
 937 }
 938
 939 /* Private method to set up a getnameinfo() request */
 940 void
 941 _g_resolver_address_to_sockaddr (GInetAddress            *address,
 942                                  struct sockaddr_storage *sa,
 943                                  gsize                   *len)
 944 {
 945   GSocketAddress *sockaddr;
 946
 947   sockaddr = g_inet_socket_address_new (address, 0);
 948   g_socket_address_to_native (sockaddr, (struct sockaddr *)sa, sizeof (*sa), NULL);
 949   *len = g_socket_address_get_native_size (sockaddr);
 950   g_object_unref (sockaddr);
 951 }
 952
 953 /* Private method to process a getnameinfo() response. */
 954 char *
 955 _g_resolver_name_from_nameinfo (GInetAddress  *address,
 956                                 const gchar   *name,
 957                                 gint           gni_retval,
 958                                 GError       **error)
 959 {
 960   if (gni_retval != 0)
 961     {
 962       gchar *phys;
 963
 964       phys = g_inet_address_to_string (address);
 965       g_set_error (error, G_RESOLVER_ERROR,
 966                    g_resolver_error_from_addrinfo_error (gni_retval),
 967                    _("Error reverse-resolving '%s': %s"),
 968                    phys ? phys : "(unknown)", gai_strerror (gni_retval));
 969       g_free (phys);
 970       return NULL;
 971     }
 972
 973   return g_strdup (name);
 974 }
 975
 976 #if defined(G_OS_UNIX)
 977
 978 static gboolean
 979 parse_short (guchar  **p,
 980              guchar   *end,
 981              guint16  *value)
 982 {
 983   if (*p + 2 > end)
 984     return FALSE;
 985   GETSHORT (*value, *p);
 986   return TRUE;
 987 }
 988
 989 static gboolean
 990 parse_long (guchar  **p,
 991             guchar   *end,
 992             guint32  *value)
 993 {
 994   if (*p + 4 > end)
 995     return FALSE;
 996   GETLONG (*value, *p);
 997   return TRUE;
 998 }
 999
1000 static GVariant *
1001 parse_res_srv (guchar  *answer,
1002                guchar  *end,
1003                guchar  *p)
1004 {
1005   gchar namebuf[1024];
1006   guint16 priority, weight, port;
1007   gint n;
1008
1009   if (!parse_short (&p, end, &priority) ||
1010       !parse_short (&p, end, &weight) ||
1011       !parse_short (&p, end, &port))
1012     return NULL;
1013
1014   n = dn_expand (answer, end, p, namebuf, sizeof (namebuf));
1015   if (n < 0)
1016     return NULL;
1017   *p += n;
1018
1019   return g_variant_new ("(qqqs)",
1020                         priority,
1021                         weight,
1022                         port,
1023                         namebuf);
1024 }
1025
1026 static GVariant *
1027 parse_res_soa (guchar  *answer,
1028                guchar  *end,
1029                guchar  *p)
1030 {
1031   gchar mnamebuf[1024];
1032   gchar rnamebuf[1024];
1033   guint32 serial, refresh, retry, expire, ttl;
1034   gint n;
1035
1036   n = dn_expand (answer, end, p, mnamebuf, sizeof (mnamebuf));
1037   if (n < 0)
1038     return NULL;
1039   p += n;
1040
1041   n = dn_expand (answer, end, p, rnamebuf, sizeof (rnamebuf));
1042   if (n < 0)
1043     return NULL;
1044   p += n;
1045
1046   if (!parse_long (&p, end, &serial) ||
1047       !parse_long (&p, end, &refresh) ||
1048       !parse_long (&p, end, &retry) ||
1049       !parse_long (&p, end, &expire) ||
1050       !parse_long (&p, end, &ttl))
1051     return NULL;
1052
1053   return g_variant_new ("(ssuuuuu)",
1054                         mnamebuf,
1055                         rnamebuf,
1056                         serial,
1057                         refresh,
1058                         retry,
1059                         expire,
1060                         ttl);
1061 }
1062
1063 static GVariant *
1064 parse_res_ns (guchar  *answer,
1065               guchar  *end,
1066               guchar  *p)
1067 {
1068   gchar namebuf[1024];
1069   gint n;
1070
1071   n = dn_expand (answer, end, p, namebuf, sizeof (namebuf));
1072   if (n < 0)
1073     return NULL;
1074
1075   return g_variant_new ("(s)", namebuf);
1076 }
1077
1078 static GVariant *
1079 parse_res_mx (guchar  *answer,
1080               guchar  *end,
1081               guchar  *p)
1082 {
1083   gchar namebuf[1024];
1084   guint16 preference;
1085   gint n;
1086
1087   if (!parse_short (&p, end, &preference))
1088     return NULL;
1089
1090   n = dn_expand (answer, end, p, namebuf, sizeof (namebuf));
1091   if (n < 0)
1092     return NULL;
1093   p += n;
1094
1095   return g_variant_new ("(qs)",
1096                         preference,
1097                         namebuf);
1098 }
1099
1100 static GVariant *
1101 parse_res_txt (guchar  *answer,
1102                guchar  *end,
1103                guchar  *p)
1104 {
1105   GVariant *record;
1106   GPtrArray *array;
1107   gsize len;
1108
1109   array = g_ptr_array_new_with_free_func (g_free);
1110   while (p < end)
1111     {
1112       len = *(p++);
1113       if (len > p - end)
1114         break;
1115       g_ptr_array_add (array, g_strndup ((gchar *)p, len));
1116       p += len;
1117     }
1118
1119   record = g_variant_new ("(@as)",
1120                           g_variant_new_strv ((const gchar **)array->pdata, array->len));
1121   g_ptr_array_free (array, TRUE);
1122   return record;
1123 }
1124
1125 gint
1126 _g_resolver_record_type_to_rrtype (GResolverRecordType type)
1127 {
1128   switch (type)
1129   {
1130     case G_RESOLVER_RECORD_SRV:
1131       return T_SRV;
1132     case G_RESOLVER_RECORD_TXT:
1133       return T_TXT;
1134     case G_RESOLVER_RECORD_SOA:
1135       return T_SOA;
1136     case G_RESOLVER_RECORD_NS:
1137       return T_NS;
1138     case G_RESOLVER_RECORD_MX:
1139       return T_MX;
1140   }
1141   g_return_val_if_reached (-1);
1142 }
1143
1144 /* Private method to process a res_query response into GSrvTargets */
1145 GList *
1146 _g_resolver_records_from_res_query (const gchar      *rrname,
1147                                     gint              rrtype,
1148                                     guchar           *answer,
1149                                     gint              len,
1150                                     gint              herr,
1151                                     GError          **error)
1152 {
1153   gint count;
1154   guchar *end, *p;
1155   guint16 type, qclass, rdlength;
1156   guint32 ttl;
1157   HEADER *header;
1158   GList *records;
1159   GVariant *record;
1160   gint n, i;
1161
1162   if (len <= 0)
1163     {
1164       GResolverError errnum;
1165       const gchar *format;
1166
1167       if (len == 0 || herr == HOST_NOT_FOUND || herr == NO_DATA)
1168         {
1169           errnum = G_RESOLVER_ERROR_NOT_FOUND;
1170           format = _("No DNS record of the requested type for '%s'");
1171         }
1172       else if (herr == TRY_AGAIN)
1173         {
1174           errnum = G_RESOLVER_ERROR_TEMPORARY_FAILURE;
1175           format = _("Temporarily unable to resolve '%s'");
1176         }
1177       else
1178         {
1179           errnum = G_RESOLVER_ERROR_INTERNAL;
1180           format = _("Error resolving '%s'");
1181         }
1182
1183       g_set_error (error, G_RESOLVER_ERROR, errnum, format, rrname);
1184       return NULL;
1185     }
1186
1187   records = NULL;
1188
1189   header = (HEADER *)answer;
1190   p = answer + sizeof (HEADER);
1191   end = answer + len;
1192
1193   /* Skip query */
1194   count = ntohs (header->qdcount);
1195   for (i = 0; i < count && p < end; i++)
1196     {
1197       n = dn_skipname (p, end);
1198       if (n < 0)
1199         break;
1200       p += n;
1201       p += 4;
1202     }
1203
1204   /* Incomplete response */
1205   if (i < count)
1206     {
1207       g_set_error (error, G_RESOLVER_ERROR, G_RESOLVER_ERROR_TEMPORARY_FAILURE,
1208                    _("Incomplete data received for '%s'"), rrname);
1209       return NULL;
1210     }
1211
1212   /* Read answers */
1213   count = ntohs (header->ancount);
1214   for (i = 0; i < count && p < end; i++)
1215     {
1216       n = dn_skipname (p, end);
1217       if (n < 0)
1218         break;
1219       p += n;
1220
1221       if (!parse_short (&p, end, &type) ||
1222           !parse_short (&p, end, &qclass) ||
1223           !parse_long (&p, end, &ttl) ||
1224           !parse_short (&p, end, &rdlength))
1225         break;
1226
1227       ttl = ttl; /* To avoid -Wunused-but-set-variable */
1228
1229       if (p + rdlength > end)
1230         break;
1231
1232       if (type == rrtype && qclass == C_IN)
1233         {
1234           switch (rrtype)
1235             {
1236             case T_SRV:
1237               record = parse_res_srv (answer, end, p);
1238               break;
1239             case T_MX:
1240               record = parse_res_mx (answer, end, p);
1241               break;
1242             case T_SOA:
1243               record = parse_res_soa (answer, end, p);
1244               break;
1245             case T_NS:
1246               record = parse_res_ns (answer, end, p);
1247               break;
1248             case T_TXT:
1249               record = parse_res_txt (answer, p + rdlength, p);
1250               break;
1251             default:
1252               g_warn_if_reached ();
1253               record = NULL;
1254               break;
1255             }
1256
1257           if (record != NULL)
1258             records = g_list_prepend (records, record);
1259         }
1260
1261       p += rdlength;
1262     }
1263
1264   /* Somehow got a truncated response */
1265   if (i < count)
1266     {
1267       g_list_free_full (records, (GDestroyNotify)g_variant_unref);
1268       g_set_error (error, G_RESOLVER_ERROR, G_RESOLVER_ERROR_TEMPORARY_FAILURE,
1269                    _("Incomplete data received for '%s'"), rrname);
1270       return NULL;
1271     }
1272
1273   return records;
1274 }
1275
1276 #elif defined(G_OS_WIN32)
1277 static GVariant *
1278 parse_dns_srv (DNS_RECORD *rec)
1279 {
1280   return g_variant_new ("(qqqs)",
1281                         (guint16)rec->Data.SRV.wPriority,
1282                         (guint16)rec->Data.SRV.wWeight,
1283                         (guint16)rec->Data.SRV.wPort,
1284                         rec->Data.SRV.pNameTarget);
1285 }
1286
1287 static GVariant *
1288 parse_dns_soa (DNS_RECORD *rec)
1289 {
1290   return g_variant_new ("(ssuuuuu)",
1291                         rec->Data.SOA.pNamePrimaryServer,
1292                         rec->Data.SOA.pNameAdministrator,
1293                         (guint32)rec->Data.SOA.dwSerialNo,
1294                         (guint32)rec->Data.SOA.dwRefresh,
1295                         (guint32)rec->Data.SOA.dwRetry,
1296                         (guint32)rec->Data.SOA.dwExpire,
1297                         (guint32)rec->Data.SOA.dwDefaultTtl);
1298 }
1299
1300 static GVariant *
1301 parse_dns_ns (DNS_RECORD *rec)
1302 {
1303   return g_variant_new ("(s)", rec->Data.NS.pNameHost);
1304 }
1305
1306 static GVariant *
1307 parse_dns_mx (DNS_RECORD *rec)
1308 {
1309   return g_variant_new ("(qs)",
1310                         (guint16)rec->Data.MX.wPreference,
1311                         rec->Data.MX.pNameExchange);
1312 }
1313
1314 static GVariant *
1315 parse_dns_txt (DNS_RECORD *rec)
1316 {
1317   GVariant *record;
1318   GPtrArray *array;
1319   DWORD i;
1320
1321   array = g_ptr_array_new ();
1322   for (i = 0; i < rec->Data.TXT.dwStringCount; i++)
1323     g_ptr_array_add (array, rec->Data.TXT.pStringArray[i]);
1324   record = g_variant_new ("(@as)",
1325                           g_variant_new_strv ((const gchar **)array->pdata, array->len));
1326   g_ptr_array_free (array, TRUE);
1327   return record;
1328 }
1329
1330 WORD
1331 _g_resolver_record_type_to_dnstype (GResolverRecordType type)
1332 {
1333   switch (type)
1334   {
1335     case G_RESOLVER_RECORD_SRV:
1336       return DNS_TYPE_SRV;
1337     case G_RESOLVER_RECORD_TXT:
1338       return DNS_TYPE_TEXT;
1339     case G_RESOLVER_RECORD_SOA:
1340       return DNS_TYPE_SOA;
1341     case G_RESOLVER_RECORD_NS:
1342       return DNS_TYPE_NS;
1343     case G_RESOLVER_RECORD_MX:
1344       return DNS_TYPE_MX;
1345   }
1346   g_return_val_if_reached (-1);
1347 }
1348
1349 /* Private method to process a DnsQuery response into GVariants */
1350 GList *
1351 _g_resolver_records_from_DnsQuery (const gchar  *rrname,
1352                                    WORD          dnstype,
1353                                    DNS_STATUS    status,
1354                                    DNS_RECORD   *results,
1355                                    GError      **error)
1356 {
1357   DNS_RECORD *rec;
1358   gpointer record;
1359   GList *records;
1360
1361   if (status != ERROR_SUCCESS)
1362     {
1363       GResolverError errnum;
1364       const gchar *format;
1365
1366       if (status == DNS_ERROR_RCODE_NAME_ERROR)
1367         {
1368           errnum = G_RESOLVER_ERROR_NOT_FOUND;
1369           format = _("No DNS record of the requested type for '%s'");
1370         }
1371       else if (status == DNS_ERROR_RCODE_SERVER_FAILURE)
1372         {
1373           errnum = G_RESOLVER_ERROR_TEMPORARY_FAILURE;
1374           format = _("Temporarily unable to resolve '%s'");
1375         }
1376       else
1377         {
1378           errnum = G_RESOLVER_ERROR_INTERNAL;
1379           format = _("Error resolving '%s'");
1380         }
1381
1382       g_set_error (error, G_RESOLVER_ERROR, errnum, format, rrname);
1383       return NULL;
1384     }
1385
1386   records = NULL;
1387   for (rec = results; rec; rec = rec->pNext)
1388     {
1389       if (rec->wType != dnstype)
1390         continue;
1391       switch (dnstype)
1392         {
1393         case DNS_TYPE_SRV:
1394           record = parse_dns_srv (rec);
1395           break;
1396         case DNS_TYPE_SOA:
1397           record = parse_dns_soa (rec);
1398           break;
1399         case DNS_TYPE_NS:
1400           record = parse_dns_ns (rec);
1401           break;
1402         case DNS_TYPE_MX:
1403           record = parse_dns_mx (rec);
1404           break;
1405         case DNS_TYPE_TEXT:
1406           record = parse_dns_txt (rec);
1407           break;
1408         default:
1409           g_warn_if_reached ();
1410           record = NULL;
1411           break;
1412         }
1413       if (record != NULL)
1414         records = g_list_prepend (records, g_variant_ref_sink (record));
1415     }
1416
1417   return records;
1418 }
1419
1420 #endif