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
 451   if (G_IS_SIMPLE_ASYNC_RESULT (result))
 452     {
 453       GSimpleAsyncResult *simple = G_SIMPLE_ASYNC_RESULT (result);
 454
 455       /* Handle the stringified-IP-addr case */
 456       if (g_simple_async_result_get_source_tag (simple) == g_resolver_lookup_by_name_async)
 457         {
 458           GInetAddress *addr;
 459
 460           addr = g_simple_async_result_get_op_res_gpointer (simple);
 461           return g_list_append (NULL, g_object_ref (addr));
 462         }
 463     }
 464
 465   addrs = G_RESOLVER_GET_CLASS (resolver)->
 466     lookup_by_name_finish (resolver, result, error);
 467
 468   remove_duplicates (addrs);
 469
 470   return addrs;
 471 }
 472
 473 /**
 474  * g_resolver_free_addresses: (skip)
 475  * @addresses: a #GList of #GInetAddress
 476  *
 477  * Frees @addresses (which should be the return value from
 478  * g_resolver_lookup_by_name() or g_resolver_lookup_by_name_finish()).
 479  * (This is a convenience method; you can also simply free the results
 480  * by hand.)
 481  *
 482  * Since: 2.22
 483  */
 484 void
 485 g_resolver_free_addresses (GList *addresses)
 486 {
 487   GList *a;
 488
 489   for (a = addresses; a; a = a->next)
 490     g_object_unref (a->data);
 491   g_list_free (addresses);
 492 }
 493
 494 /**
 495  * g_resolver_lookup_by_address:
 496  * @resolver: a #GResolver
 497  * @address: the address to reverse-resolve
 498  * @cancellable: (allow-none): a #GCancellable, or %NULL
 499  * @error: return location for a #GError, or %NULL
 500  *
 501  * Synchronously reverse-resolves @address to determine its
 502  * associated hostname.
 503  *
 504  * If the DNS resolution fails, @error (if non-%NULL) will be set to
 505  * a value from #GResolverError.
 506  *
 507  * If @cancellable is non-%NULL, it can be used to cancel the
 508  * operation, in which case @error (if non-%NULL) will be set to
 509  * %G_IO_ERROR_CANCELLED.
 510  *
 511  * Return value: a hostname (either ASCII-only, or in ASCII-encoded
 512  *     form), or %NULL on error.
 513  *
 514  * Since: 2.22
 515  */
 516 gchar *
 517 g_resolver_lookup_by_address (GResolver     *resolver,
 518                               GInetAddress  *address,
 519                               GCancellable  *cancellable,
 520                               GError       **error)
 521 {
 522   g_return_val_if_fail (G_IS_RESOLVER (resolver), NULL);
 523   g_return_val_if_fail (G_IS_INET_ADDRESS (address), NULL);
 524
 525   g_resolver_maybe_reload (resolver);
 526   return G_RESOLVER_GET_CLASS (resolver)->
 527     lookup_by_address (resolver, address, cancellable, error);
 528 }
 529
 530 /**
 531  * g_resolver_lookup_by_address_async:
 532  * @resolver: a #GResolver
 533  * @address: the address to reverse-resolve
 534  * @cancellable: (allow-none): a #GCancellable, or %NULL
 535  * @callback: (scope async): callback to call after resolution completes
 536  * @user_data: (closure): data for @callback
 537  *
 538  * Begins asynchronously reverse-resolving @address to determine its
 539  * associated hostname, and eventually calls @callback, which must
 540  * call g_resolver_lookup_by_address_finish() to get the final result.
 541  *
 542  * Since: 2.22
 543  */
 544 void
 545 g_resolver_lookup_by_address_async (GResolver           *resolver,
 546                                     GInetAddress        *address,
 547                                     GCancellable        *cancellable,
 548                                     GAsyncReadyCallback  callback,
 549                                     gpointer             user_data)
 550 {
 551   g_return_if_fail (G_IS_RESOLVER (resolver));
 552   g_return_if_fail (G_IS_INET_ADDRESS (address));
 553
 554   g_resolver_maybe_reload (resolver);
 555   G_RESOLVER_GET_CLASS (resolver)->
 556     lookup_by_address_async (resolver, address, cancellable, callback, user_data);
 557 }
 558
 559 /**
 560  * g_resolver_lookup_by_address_finish:
 561  * @resolver: a #GResolver
 562  * @result: the result passed to your #GAsyncReadyCallback
 563  * @error: return location for a #GError, or %NULL
 564  *
 565  * Retrieves the result of a previous call to
 566  * g_resolver_lookup_by_address_async().
 567  *
 568  * If the DNS resolution failed, @error (if non-%NULL) will be set to
 569  * a value from #GResolverError. If the operation was cancelled,
 570  * @error will be set to %G_IO_ERROR_CANCELLED.
 571  *
 572  * Return value: a hostname (either ASCII-only, or in ASCII-encoded
 573  * form), or %NULL on error.
 574  *
 575  * Since: 2.22
 576  */
 577 gchar *
 578 g_resolver_lookup_by_address_finish (GResolver     *resolver,
 579                                      GAsyncResult  *result,
 580                                      GError       **error)
 581 {
 582   g_return_val_if_fail (G_IS_RESOLVER (resolver), NULL);
 583
 584   if (g_async_result_legacy_propagate_error (result, error))
 585     return NULL;
 586
 587   return G_RESOLVER_GET_CLASS (resolver)->
 588     lookup_by_address_finish (resolver, result, error);
 589 }
 590
 591 static gchar *
 592 g_resolver_get_service_rrname (const char *service,
 593                                const char *protocol,
 594                                const char *domain)
 595 {
 596   gchar *rrname, *ascii_domain = NULL;
 597
 598   if (g_hostname_is_non_ascii (domain))
 599     domain = ascii_domain = g_hostname_to_ascii (domain);
 600
 601   rrname = g_strdup_printf ("_%s._%s.%s", service, protocol, domain);
 602
 603   g_free (ascii_domain);
 604   return rrname;
 605 }
 606
 607 /**
 608  * g_resolver_lookup_service:
 609  * @resolver: a #GResolver
 610  * @service: the service type to look up (eg, "ldap")
 611  * @protocol: the networking protocol to use for @service (eg, "tcp")
 612  * @domain: the DNS domain to look up the service in
 613  * @cancellable: (allow-none): a #GCancellable, or %NULL
 614  * @error: return location for a #GError, or %NULL
 615  *
 616  * Synchronously performs a DNS SRV lookup for the given @service and
 617  * @protocol in the given @domain and returns an array of #GSrvTarget.
 618  * @domain may be an ASCII-only or UTF-8 hostname. Note also that the
 619  * @service and @protocol arguments <emphasis>do not</emphasis>
 620  * include the leading underscore that appears in the actual DNS
 621  * entry.
 622  *
 623  * On success, g_resolver_lookup_service() will return a #GList of
 624  * #GSrvTarget, sorted in order of preference. (That is, you should
 625  * attempt to connect to the first target first, then the second if
 626  * the first fails, etc.)
 627  *
 628  * If the DNS resolution fails, @error (if non-%NULL) will be set to
 629  * a value from #GResolverError.
 630  *
 631  * If @cancellable is non-%NULL, it can be used to cancel the
 632  * operation, in which case @error (if non-%NULL) will be set to
 633  * %G_IO_ERROR_CANCELLED.
 634  *
 635  * If you are planning to connect to the service, it is usually easier
 636  * to create a #GNetworkService and use its #GSocketConnectable
 637  * interface.
 638  *
 639  * Return value: (element-type GSrvTarget) (transfer full): a #GList of #GSrvTarget,
 640  * or %NULL on error. You must free each of the targets and the list when you are
 641  * done with it. (You can use g_resolver_free_targets() to do this.)
 642  *
 643  * Since: 2.22
 644  */
 645 GList *
 646 g_resolver_lookup_service (GResolver     *resolver,
 647                            const gchar   *service,
 648                            const gchar   *protocol,
 649                            const gchar   *domain,
 650                            GCancellable  *cancellable,
 651                            GError       **error)
 652 {
 653   GList *targets;
 654   gchar *rrname;
 655
 656   g_return_val_if_fail (G_IS_RESOLVER (resolver), NULL);
 657   g_return_val_if_fail (service != NULL, NULL);
 658   g_return_val_if_fail (protocol != NULL, NULL);
 659   g_return_val_if_fail (domain != NULL, NULL);
 660
 661   rrname = g_resolver_get_service_rrname (service, protocol, domain);
 662
 663   g_resolver_maybe_reload (resolver);
 664   targets = G_RESOLVER_GET_CLASS (resolver)->
 665     lookup_service (resolver, rrname, cancellable, error);
 666
 667   g_free (rrname);
 668   return targets;
 669 }
 670
 671 /**
 672  * g_resolver_lookup_service_async:
 673  * @resolver: a #GResolver
 674  * @service: the service type to look up (eg, "ldap")
 675  * @protocol: the networking protocol to use for @service (eg, "tcp")
 676  * @domain: the DNS domain to look up the service in
 677  * @cancellable: (allow-none): a #GCancellable, or %NULL
 678  * @callback: (scope async): callback to call after resolution completes
 679  * @user_data: (closure): data for @callback
 680  *
 681  * Begins asynchronously performing a DNS SRV lookup for the given
 682  * @service and @protocol in the given @domain, and eventually calls
 683  * @callback, which must call g_resolver_lookup_service_finish() to
 684  * get the final result. See g_resolver_lookup_service() for more
 685  * details.
 686  *
 687  * Since: 2.22
 688  */
 689 void
 690 g_resolver_lookup_service_async (GResolver           *resolver,
 691                                  const gchar         *service,
 692                                  const gchar         *protocol,
 693                                  const gchar         *domain,
 694                                  GCancellable        *cancellable,
 695                                  GAsyncReadyCallback  callback,
 696                                  gpointer             user_data)
 697 {
 698   gchar *rrname;
 699
 700   g_return_if_fail (G_IS_RESOLVER (resolver));
 701   g_return_if_fail (service != NULL);
 702   g_return_if_fail (protocol != NULL);
 703   g_return_if_fail (domain != NULL);
 704
 705   rrname = g_resolver_get_service_rrname (service, protocol, domain);
 706
 707   g_resolver_maybe_reload (resolver);
 708   G_RESOLVER_GET_CLASS (resolver)->
 709     lookup_service_async (resolver, rrname, cancellable, callback, user_data);
 710
 711   g_free (rrname);
 712 }
 713
 714 /**
 715  * g_resolver_lookup_service_finish:
 716  * @resolver: a #GResolver
 717  * @result: the result passed to your #GAsyncReadyCallback
 718  * @error: return location for a #GError, or %NULL
 719  *
 720  * Retrieves the result of a previous call to
 721  * g_resolver_lookup_service_async().
 722  *
 723  * If the DNS resolution failed, @error (if non-%NULL) will be set to
 724  * a value from #GResolverError. If the operation was cancelled,
 725  * @error will be set to %G_IO_ERROR_CANCELLED.
 726  *
 727  * Return value: (element-type GSrvTarget) (transfer full): a #GList of #GSrvTarget,
 728  * or %NULL on error. See g_resolver_lookup_service() for more details.
 729  *
 730  * Since: 2.22
 731  */
 732 GList *
 733 g_resolver_lookup_service_finish (GResolver     *resolver,
 734                                   GAsyncResult  *result,
 735                                   GError       **error)
 736 {
 737   g_return_val_if_fail (G_IS_RESOLVER (resolver), NULL);
 738
 739   if (g_async_result_legacy_propagate_error (result, error))
 740     return NULL;
 741
 742   return G_RESOLVER_GET_CLASS (resolver)->
 743     lookup_service_finish (resolver, result, error);
 744 }
 745
 746 /**
 747  * g_resolver_free_targets: (skip)
 748  * @targets: a #GList of #GSrvTarget
 749  *
 750  * Frees @targets (which should be the return value from
 751  * g_resolver_lookup_service() or g_resolver_lookup_service_finish()).
 752  * (This is a convenience method; you can also simply free the
 753  * results by hand.)
 754  *
 755  * Since: 2.22
 756  */
 757 void
 758 g_resolver_free_targets (GList *targets)
 759 {
 760   GList *t;
 761
 762   for (t = targets; t; t = t->next)
 763     g_srv_target_free (t->data);
 764   g_list_free (targets);
 765 }
 766
 767 /**
 768  * g_resolver_lookup_records:
 769  * @resolver: a #GResolver
 770  * @rrname: the DNS name to lookup the record for
 771  * @record_type: the type of DNS record to lookup
 772  * @cancellable: (allow-none): a #GCancellable, or %NULL
 773  * @error: return location for a #GError, or %NULL
 774  *
 775  * Synchronously performs a DNS record lookup for the given @rrname and returns
 776  * a list of records as #GVariant tuples. See #GResolverRecordType for
 777  * information on what the records contain for each @record_type.
 778  *
 779  * If the DNS resolution fails, @error (if non-%NULL) will be set to
 780  * a value from #GResolverError.
 781  *
 782  * If @cancellable is non-%NULL, it can be used to cancel the
 783  * operation, in which case @error (if non-%NULL) will be set to
 784  * %G_IO_ERROR_CANCELLED.
 785  *
 786  * Return value: (element-type GVariant) (transfer full): a #GList of #GVariant,
 787  * or %NULL on error. You must free each of the records and the list when you are
 788  * done with it. (You can use g_list_free_full() with g_variant_unref() to do this.)
 789  *
 790  * Since: 2.34
 791  */
 792 GList *
 793 g_resolver_lookup_records (GResolver            *resolver,
 794                            const gchar          *rrname,
 795                            GResolverRecordType   record_type,
 796                            GCancellable         *cancellable,
 797                            GError              **error)
 798 {
 799   GList *records;
 800
 801   g_return_val_if_fail (G_IS_RESOLVER (resolver), NULL);
 802   g_return_val_if_fail (rrname != NULL, NULL);
 803
 804   g_resolver_maybe_reload (resolver);
 805   records = G_RESOLVER_GET_CLASS (resolver)->
 806     lookup_records (resolver, rrname, record_type, cancellable, error);
 807
 808   return records;
 809 }
 810
 811 /**
 812  * g_resolver_lookup_records_async:
 813  * @resolver: a #GResolver
 814  * @rrname: the DNS name to lookup the record for
 815  * @record_type: the type of DNS record to lookup
 816  * @cancellable: (allow-none): a #GCancellable, or %NULL
 817  * @callback: (scope async): callback to call after resolution completes
 818  * @user_data: (closure): data for @callback
 819  *
 820  * Begins asynchronously performing a DNS lookup for the given
 821  * @rrname, and eventually calls @callback, which must call
 822  * g_resolver_lookup_records_finish() to get the final result. See
 823  * g_resolver_lookup_records() for more details.
 824  *
 825  * Since: 2.34
 826  */
 827 void
 828 g_resolver_lookup_records_async (GResolver           *resolver,
 829                                  const gchar         *rrname,
 830                                  GResolverRecordType  record_type,
 831                                  GCancellable        *cancellable,
 832                                  GAsyncReadyCallback  callback,
 833                                  gpointer             user_data)
 834 {
 835   g_return_if_fail (G_IS_RESOLVER (resolver));
 836   g_return_if_fail (rrname != NULL);
 837
 838   g_resolver_maybe_reload (resolver);
 839   G_RESOLVER_GET_CLASS (resolver)->
 840     lookup_records_async (resolver, rrname, record_type, cancellable, callback, user_data);
 841 }
 842
 843 /**
 844  * g_resolver_lookup_records_finish:
 845  * @resolver: a #GResolver
 846  * @result: the result passed to your #GAsyncReadyCallback
 847  * @error: return location for a #GError, or %NULL
 848  *
 849  * Retrieves the result of a previous call to
 850  * g_resolver_lookup_records_async(). Returns a list of records as #GVariant
 851  * tuples. See #GResolverRecordType for information on what the records contain.
 852  *
 853  * If the DNS resolution failed, @error (if non-%NULL) will be set to
 854  * a value from #GResolverError. If the operation was cancelled,
 855  * @error will be set to %G_IO_ERROR_CANCELLED.
 856  *
 857  * Return value: (element-type GVariant) (transfer full): a #GList of #GVariant,
 858  * or %NULL on error. You must free each of the records and the list when you are
 859  * done with it. (You can use g_list_free_full() with g_variant_unref() to do this.)
 860  *
 861  * Since: 2.34
 862  */
 863 GList *
 864 g_resolver_lookup_records_finish (GResolver     *resolver,
 865                                   GAsyncResult  *result,
 866                                   GError       **error)
 867 {
 868   g_return_val_if_fail (G_IS_RESOLVER (resolver), NULL);
 869   return G_RESOLVER_GET_CLASS (resolver)->
 870     lookup_records_finish (resolver, result, error);
 871 }
 872
 873 /**
 874  * g_resolver_error_quark:
 875  *
 876  * Gets the #GResolver Error Quark.
 877  *
 878  * Return value: a #GQuark.
 879  *
 880  * Since: 2.22
 881  */
 882 GQuark
 883 g_resolver_error_quark (void)
 884 {
 885   return g_quark_from_static_string ("g-resolver-error-quark");
 886 }
 887
 888
 889 static GResolverError
 890 g_resolver_error_from_addrinfo_error (gint err)
 891 {
 892   switch (err)
 893     {
 894     case EAI_FAIL:
 895 #if defined(EAI_NODATA) && (EAI_NODATA != EAI_NONAME)
 896     case EAI_NODATA:
 897 #endif
 898     case EAI_NONAME:
 899       return G_RESOLVER_ERROR_NOT_FOUND;
 900
 901     case EAI_AGAIN:
 902       return G_RESOLVER_ERROR_TEMPORARY_FAILURE;
 903
 904     default:
 905       return G_RESOLVER_ERROR_INTERNAL;
 906     }
 907 }
 908
 909 struct addrinfo _g_resolver_addrinfo_hints;
 910
 911 /* Private method to process a getaddrinfo() response. */
 912 GList *
 913 _g_resolver_addresses_from_addrinfo (const char       *hostname,
 914                                      struct addrinfo  *res,
 915                                      gint              gai_retval,
 916                                      GError          **error)
 917 {
 918   struct addrinfo *ai;
 919   GSocketAddress *sockaddr;
 920   GInetAddress *addr;
 921   GList *addrs;
 922
 923   if (gai_retval != 0)
 924     {
 925       g_set_error (error, G_RESOLVER_ERROR,
 926                    g_resolver_error_from_addrinfo_error (gai_retval),
 927                    _("Error resolving '%s': %s"),
 928                    hostname, gai_strerror (gai_retval));
 929       return NULL;
 930     }
 931
 932   g_return_val_if_fail (res != NULL, NULL);
 933
 934   addrs = NULL;
 935   for (ai = res; ai; ai = ai->ai_next)
 936     {
 937       sockaddr = g_socket_address_new_from_native (ai->ai_addr, ai->ai_addrlen);
 938       if (!sockaddr || !G_IS_INET_SOCKET_ADDRESS (sockaddr))
 939         continue;
 940
 941       addr = g_object_ref (g_inet_socket_address_get_address ((GInetSocketAddress *)sockaddr));
 942       addrs = g_list_prepend (addrs, addr);
 943       g_object_unref (sockaddr);
 944     }
 945
 946   return g_list_reverse (addrs);
 947 }
 948
 949 /* Private method to set up a getnameinfo() request */
 950 void
 951 _g_resolver_address_to_sockaddr (GInetAddress            *address,
 952                                  struct sockaddr_storage *sa,
 953                                  gsize                   *len)
 954 {
 955   GSocketAddress *sockaddr;
 956
 957   sockaddr = g_inet_socket_address_new (address, 0);
 958   g_socket_address_to_native (sockaddr, (struct sockaddr *)sa, sizeof (*sa), NULL);
 959   *len = g_socket_address_get_native_size (sockaddr);
 960   g_object_unref (sockaddr);
 961 }
 962
 963 /* Private method to process a getnameinfo() response. */
 964 char *
 965 _g_resolver_name_from_nameinfo (GInetAddress  *address,
 966                                 const gchar   *name,
 967                                 gint           gni_retval,
 968                                 GError       **error)
 969 {
 970   if (gni_retval != 0)
 971     {
 972       gchar *phys;
 973
 974       phys = g_inet_address_to_string (address);
 975       g_set_error (error, G_RESOLVER_ERROR,
 976                    g_resolver_error_from_addrinfo_error (gni_retval),
 977                    _("Error reverse-resolving '%s': %s"),
 978                    phys ? phys : "(unknown)", gai_strerror (gni_retval));
 979       g_free (phys);
 980       return NULL;
 981     }
 982
 983   return g_strdup (name);
 984 }
 985
 986 #if defined(G_OS_UNIX)
 987
 988 static gboolean
 989 parse_short (guchar  **p,
 990              guchar   *end,
 991              guint16  *value)
 992 {
 993   if (*p + 2 > end)
 994     return FALSE;
 995   GETSHORT (*value, *p);
 996   return TRUE;
 997 }
 998
 999 static gboolean
1000 parse_long (guchar  **p,
1001             guchar   *end,
1002             guint32  *value)
1003 {
1004   if (*p + 4 > end)
1005     return FALSE;
1006   GETLONG (*value, *p);
1007   return TRUE;
1008 }
1009
1010 static GVariant *
1011 parse_res_srv (guchar  *answer,
1012                guchar  *end,
1013                guchar  *p)
1014 {
1015   gchar namebuf[1024];
1016   guint16 priority, weight, port;
1017   gint n;
1018
1019   if (!parse_short (&p, end, &priority) ||
1020       !parse_short (&p, end, &weight) ||
1021       !parse_short (&p, end, &port))
1022     return NULL;
1023
1024   n = dn_expand (answer, end, p, namebuf, sizeof (namebuf));
1025   if (n < 0)
1026     return NULL;
1027   *p += n;
1028
1029   return g_variant_new ("(qqqs)",
1030                         priority,
1031                         weight,
1032                         port,
1033                         namebuf);
1034 }
1035
1036 static GVariant *
1037 parse_res_soa (guchar  *answer,
1038                guchar  *end,
1039                guchar  *p)
1040 {
1041   gchar mnamebuf[1024];
1042   gchar rnamebuf[1024];
1043   guint32 serial, refresh, retry, expire, ttl;
1044   gint n;
1045
1046   n = dn_expand (answer, end, p, mnamebuf, sizeof (mnamebuf));
1047   if (n < 0)
1048     return NULL;
1049   p += n;
1050
1051   n = dn_expand (answer, end, p, rnamebuf, sizeof (rnamebuf));
1052   if (n < 0)
1053     return NULL;
1054   p += n;
1055
1056   if (!parse_long (&p, end, &serial) ||
1057       !parse_long (&p, end, &refresh) ||
1058       !parse_long (&p, end, &retry) ||
1059       !parse_long (&p, end, &expire) ||
1060       !parse_long (&p, end, &ttl))
1061     return NULL;
1062
1063   return g_variant_new ("(ssuuuuu)",
1064                         mnamebuf,
1065                         rnamebuf,
1066                         serial,
1067                         refresh,
1068                         retry,
1069                         expire,
1070                         ttl);
1071 }
1072
1073 static GVariant *
1074 parse_res_ns (guchar  *answer,
1075               guchar  *end,
1076               guchar  *p)
1077 {
1078   gchar namebuf[1024];
1079   gint n;
1080
1081   n = dn_expand (answer, end, p, namebuf, sizeof (namebuf));
1082   if (n < 0)
1083     return NULL;
1084
1085   return g_variant_new ("(s)", namebuf);
1086 }
1087
1088 static GVariant *
1089 parse_res_mx (guchar  *answer,
1090               guchar  *end,
1091               guchar  *p)
1092 {
1093   gchar namebuf[1024];
1094   guint16 preference;
1095   gint n;
1096
1097   if (!parse_short (&p, end, &preference))
1098     return NULL;
1099
1100   n = dn_expand (answer, end, p, namebuf, sizeof (namebuf));
1101   if (n < 0)
1102     return NULL;
1103   p += n;
1104
1105   return g_variant_new ("(qs)",
1106                         preference,
1107                         namebuf);
1108 }
1109
1110 static GVariant *
1111 parse_res_txt (guchar  *answer,
1112                guchar  *end,
1113                guchar  *p)
1114 {
1115   GVariant *record;
1116   GPtrArray *array;
1117   gsize len;
1118
1119   array = g_ptr_array_new_with_free_func (g_free);
1120   while (p < end)
1121     {
1122       len = *(p++);
1123       if (len > p - end)
1124         break;
1125       g_ptr_array_add (array, g_strndup ((gchar *)p, len));
1126       p += len;
1127     }
1128
1129   record = g_variant_new ("(@as)",
1130                           g_variant_new_strv ((const gchar **)array->pdata, array->len));
1131   g_ptr_array_free (array, TRUE);
1132   return record;
1133 }
1134
1135 gint
1136 _g_resolver_record_type_to_rrtype (GResolverRecordType type)
1137 {
1138   switch (type)
1139   {
1140     case G_RESOLVER_RECORD_SRV:
1141       return T_SRV;
1142     case G_RESOLVER_RECORD_TXT:
1143       return T_TXT;
1144     case G_RESOLVER_RECORD_SOA:
1145       return T_SOA;
1146     case G_RESOLVER_RECORD_NS:
1147       return T_NS;
1148     case G_RESOLVER_RECORD_MX:
1149       return T_MX;
1150   }
1151   g_return_val_if_reached (-1);
1152 }
1153
1154 /* Private method to process a res_query response into GSrvTargets */
1155 GList *
1156 _g_resolver_records_from_res_query (const gchar      *rrname,
1157                                     gint              rrtype,
1158                                     guchar           *answer,
1159                                     gint              len,
1160                                     gint              herr,
1161                                     GError          **error)
1162 {
1163   gint count;
1164   guchar *end, *p;
1165   guint16 type, qclass, rdlength;
1166   guint32 ttl;
1167   HEADER *header;
1168   GList *records;
1169   GVariant *record;
1170   gint n, i;
1171
1172   if (len <= 0)
1173     {
1174       GResolverError errnum;
1175       const gchar *format;
1176
1177       if (len == 0 || herr == HOST_NOT_FOUND || herr == NO_DATA)
1178         {
1179           errnum = G_RESOLVER_ERROR_NOT_FOUND;
1180           format = _("No DNS record of the requested type for '%s'");
1181         }
1182       else if (herr == TRY_AGAIN)
1183         {
1184           errnum = G_RESOLVER_ERROR_TEMPORARY_FAILURE;
1185           format = _("Temporarily unable to resolve '%s'");
1186         }
1187       else
1188         {
1189           errnum = G_RESOLVER_ERROR_INTERNAL;
1190           format = _("Error resolving '%s'");
1191         }
1192
1193       g_set_error (error, G_RESOLVER_ERROR, errnum, format, rrname);
1194       return NULL;
1195     }
1196
1197   records = NULL;
1198
1199   header = (HEADER *)answer;
1200   p = answer + sizeof (HEADER);
1201   end = answer + len;
1202
1203   /* Skip query */
1204   count = ntohs (header->qdcount);
1205   for (i = 0; i < count && p < end; i++)
1206     {
1207       n = dn_skipname (p, end);
1208       if (n < 0)
1209         break;
1210       p += n;
1211       p += 4;
1212     }
1213
1214   /* Incomplete response */
1215   if (i < count)
1216     {
1217       g_set_error (error, G_RESOLVER_ERROR, G_RESOLVER_ERROR_TEMPORARY_FAILURE,
1218                    _("Incomplete data received for '%s'"), rrname);
1219       return NULL;
1220     }
1221
1222   /* Read answers */
1223   count = ntohs (header->ancount);
1224   for (i = 0; i < count && p < end; i++)
1225     {
1226       n = dn_skipname (p, end);
1227       if (n < 0)
1228         break;
1229       p += n;
1230
1231       if (!parse_short (&p, end, &type) ||
1232           !parse_short (&p, end, &qclass) ||
1233           !parse_long (&p, end, &ttl) ||
1234           !parse_short (&p, end, &rdlength))
1235         break;
1236
1237       ttl = ttl; /* To avoid -Wunused-but-set-variable */
1238
1239       if (p + rdlength > end)
1240         break;
1241
1242       if (type == rrtype && qclass == C_IN)
1243         {
1244           switch (rrtype)
1245             {
1246             case T_SRV:
1247               record = parse_res_srv (answer, end, p);
1248               break;
1249             case T_MX:
1250               record = parse_res_mx (answer, end, p);
1251               break;
1252             case T_SOA:
1253               record = parse_res_soa (answer, end, p);
1254               break;
1255             case T_NS:
1256               record = parse_res_ns (answer, end, p);
1257               break;
1258             case T_TXT:
1259               record = parse_res_txt (answer, p + rdlength, p);
1260               break;
1261             default:
1262               g_warn_if_reached ();
1263               record = NULL;
1264               break;
1265             }
1266
1267           if (record != NULL)
1268             records = g_list_prepend (records, record);
1269         }
1270
1271       p += rdlength;
1272     }
1273
1274   /* Somehow got a truncated response */
1275   if (i < count)
1276     {
1277       g_list_free_full (records, (GDestroyNotify)g_variant_unref);
1278       g_set_error (error, G_RESOLVER_ERROR, G_RESOLVER_ERROR_TEMPORARY_FAILURE,
1279                    _("Incomplete data received for '%s'"), rrname);
1280       return NULL;
1281     }
1282
1283   return records;
1284 }
1285
1286 #elif defined(G_OS_WIN32)
1287 static GVariant *
1288 parse_dns_srv (DNS_RECORD *rec)
1289 {
1290   return g_variant_new ("(qqqs)",
1291                         (guint16)rec->Data.SRV.wPriority,
1292                         (guint16)rec->Data.SRV.wWeight,
1293                         (guint16)rec->Data.SRV.wPort,
1294                         rec->Data.SRV.pNameTarget);
1295 }
1296
1297 static GVariant *
1298 parse_dns_soa (DNS_RECORD *rec)
1299 {
1300   return g_variant_new ("(ssuuuuu)",
1301                         rec->Data.SOA.pNamePrimaryServer,
1302                         rec->Data.SOA.pNameAdministrator,
1303                         (guint32)rec->Data.SOA.dwSerialNo,
1304                         (guint32)rec->Data.SOA.dwRefresh,
1305                         (guint32)rec->Data.SOA.dwRetry,
1306                         (guint32)rec->Data.SOA.dwExpire,
1307                         (guint32)rec->Data.SOA.dwDefaultTtl);
1308 }
1309
1310 static GVariant *
1311 parse_dns_ns (DNS_RECORD *rec)
1312 {
1313   return g_variant_new ("(s)", rec->Data.NS.pNameHost);
1314 }
1315
1316 static GVariant *
1317 parse_dns_mx (DNS_RECORD *rec)
1318 {
1319   return g_variant_new ("(qs)",
1320                         (guint16)rec->Data.MX.wPreference,
1321                         rec->Data.MX.pNameExchange);
1322 }
1323
1324 static GVariant *
1325 parse_dns_txt (DNS_RECORD *rec)
1326 {
1327   GVariant *record;
1328   GPtrArray *array;
1329   DWORD i;
1330
1331   array = g_ptr_array_new ();
1332   for (i = 0; i < rec->Data.TXT.dwStringCount; i++)
1333     g_ptr_array_add (array, rec->Data.TXT.pStringArray[i]);
1334   record = g_variant_new ("(@as)",
1335                           g_variant_new_strv ((const gchar **)array->pdata, array->len));
1336   g_ptr_array_free (array, TRUE);
1337   return record;
1338 }
1339
1340 WORD
1341 _g_resolver_record_type_to_dnstype (GResolverRecordType type)
1342 {
1343   switch (type)
1344   {
1345     case G_RESOLVER_RECORD_SRV:
1346       return DNS_TYPE_SRV;
1347     case G_RESOLVER_RECORD_TXT:
1348       return DNS_TYPE_TEXT;
1349     case G_RESOLVER_RECORD_SOA:
1350       return DNS_TYPE_SOA;
1351     case G_RESOLVER_RECORD_NS:
1352       return DNS_TYPE_NS;
1353     case G_RESOLVER_RECORD_MX:
1354       return DNS_TYPE_MX;
1355   }
1356   g_return_val_if_reached (-1);
1357 }
1358
1359 /* Private method to process a DnsQuery response into GVariants */
1360 GList *
1361 _g_resolver_records_from_DnsQuery (const gchar  *rrname,
1362                                    WORD          dnstype,
1363                                    DNS_STATUS    status,
1364                                    DNS_RECORD   *results,
1365                                    GError      **error)
1366 {
1367   DNS_RECORD *rec;
1368   gpointer record;
1369   GList *records;
1370
1371   if (status != ERROR_SUCCESS)
1372     {
1373       GResolverError errnum;
1374       const gchar *format;
1375
1376       if (status == DNS_ERROR_RCODE_NAME_ERROR)
1377         {
1378           errnum = G_RESOLVER_ERROR_NOT_FOUND;
1379           format = _("No DNS record of the requested type for '%s'");
1380         }
1381       else if (status == DNS_ERROR_RCODE_SERVER_FAILURE)
1382         {
1383           errnum = G_RESOLVER_ERROR_TEMPORARY_FAILURE;
1384           format = _("Temporarily unable to resolve '%s'");
1385         }
1386       else
1387         {
1388           errnum = G_RESOLVER_ERROR_INTERNAL;
1389           format = _("Error resolving '%s'");
1390         }
1391
1392       g_set_error (error, G_RESOLVER_ERROR, errnum, format, rrname);
1393       return NULL;
1394     }
1395
1396   records = NULL;
1397   for (rec = results; rec; rec = rec->pNext)
1398     {
1399       if (rec->wType != dnstype)
1400         continue;
1401       switch (dnstype)
1402         {
1403         case DNS_TYPE_SRV:
1404           record = parse_dns_srv (rec);
1405           break;
1406         case DNS_TYPE_SOA:
1407           record = parse_dns_soa (rec);
1408           break;
1409         case DNS_TYPE_NS:
1410           record = parse_dns_ns (rec);
1411           break;
1412         case DNS_TYPE_MX:
1413           record = parse_dns_mx (rec);
1414           break;
1415         case DNS_TYPE_TEXT:
1416           record = parse_dns_txt (rec);
1417           break;
1418         default:
1419           g_warn_if_reached ();
1420           record = NULL;
1421           break;
1422         }
1423       if (record != NULL)
1424         records = g_list_prepend (records, g_variant_ref_sink (record));
1425     }
1426
1427   return records;
1428 }
1429
1430 #endif