gio/gthreadedresolver.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 <stdio.h>
  28 #include <string.h>
  29
  30 #include "gthreadedresolver.h"
  31 #include "gnetworkingprivate.h"
  32
  33 #include "gcancellable.h"
  34 #include "ginetaddress.h"
  35 #include "ginetsocketaddress.h"
  36 #include "gtask.h"
  37 #include "gsocketaddress.h"
  38 #include "gsrvtarget.h"
  39
  40
  41 G_DEFINE_TYPE (GThreadedResolver, g_threaded_resolver, G_TYPE_RESOLVER)
  42
  43 static void
  44 g_threaded_resolver_init (GThreadedResolver *gtr)
  45 {
  46 }
  47
  48 static GResolverError
  49 g_resolver_error_from_addrinfo_error (gint err)
  50 {
  51   switch (err)
  52     {
  53     case EAI_FAIL:
  54 #if defined(EAI_NODATA) && (EAI_NODATA != EAI_NONAME)
  55     case EAI_NODATA:
  56 #endif
  57     case EAI_NONAME:
  58       return G_RESOLVER_ERROR_NOT_FOUND;
  59
  60     case EAI_AGAIN:
  61       return G_RESOLVER_ERROR_TEMPORARY_FAILURE;
  62
  63     default:
  64       return G_RESOLVER_ERROR_INTERNAL;
  65     }
  66 }
  67
  68 static struct addrinfo addrinfo_hints;
  69
  70 static void
  71 do_lookup_by_name (GTask         *task,
  72                    gpointer       source_object,
  73                    gpointer       task_data,
  74                    GCancellable  *cancellable)
  75 {
  76   const char *hostname = task_data;
  77   struct addrinfo *res = NULL;
  78   GList *addresses;
  79   gint retval;
  80
  81   retval = getaddrinfo (hostname, NULL, &addrinfo_hints, &res);
  82
  83   if (retval == 0)
  84     {
  85       struct addrinfo *ai;
  86       GSocketAddress *sockaddr;
  87       GInetAddress *addr;
  88
  89       addresses = NULL;
  90       for (ai = res; ai; ai = ai->ai_next)
  91         {
  92           sockaddr = g_socket_address_new_from_native (ai->ai_addr, ai->ai_addrlen);
  93           if (!sockaddr || !G_IS_INET_SOCKET_ADDRESS (sockaddr))
  94             continue;
  95
  96           addr = g_object_ref (g_inet_socket_address_get_address ((GInetSocketAddress *)sockaddr));
  97           addresses = g_list_prepend (addresses, addr);
  98           g_object_unref (sockaddr);
  99         }
 100
 101       addresses = g_list_reverse (addresses);
 102       g_task_return_pointer (task, addresses,
 103                              (GDestroyNotify)g_resolver_free_addresses);
 104     }
 105   else
 106     {
 107       g_task_return_new_error (task,
 108                                G_RESOLVER_ERROR,
 109                                g_resolver_error_from_addrinfo_error (retval),
 110                                _("Error resolving '%s': %s"),
 111                                hostname, gai_strerror (retval));
 112     }
 113
 114   if (res)
 115     freeaddrinfo (res);
 116 }
 117
 118 static GList *
 119 lookup_by_name (GResolver     *resolver,
 120                 const gchar   *hostname,
 121                 GCancellable  *cancellable,
 122                 GError       **error)
 123 {
 124   GTask *task;
 125   GList *addresses;
 126
 127   task = g_task_new (resolver, cancellable, NULL, NULL);
 128   g_task_set_task_data (task, g_strdup (hostname), g_free);
 129   g_task_set_return_on_cancel (task, TRUE);
 130   g_task_run_in_thread_sync (task, do_lookup_by_name);
 131   addresses = g_task_propagate_pointer (task, error);
 132   g_object_unref (task);
 133
 134   return addresses;
 135 }
 136
 137 static void
 138 lookup_by_name_async (GResolver           *resolver,
 139                       const gchar         *hostname,
 140                       GCancellable        *cancellable,
 141                       GAsyncReadyCallback  callback,
 142                       gpointer             user_data)
 143 {
 144   GTask *task;
 145
 146   task = g_task_new (resolver, cancellable, callback, user_data);
 147   g_task_set_task_data (task, g_strdup (hostname), g_free);
 148   g_task_set_return_on_cancel (task, TRUE);
 149   g_task_run_in_thread (task, do_lookup_by_name);
 150   g_object_unref (task);
 151 }
 152
 153 static GList *
 154 lookup_by_name_finish (GResolver     *resolver,
 155                        GAsyncResult  *result,
 156                        GError       **error)
 157 {
 158   g_return_val_if_fail (g_task_is_valid (result, resolver), NULL);
 159
 160   return g_task_propagate_pointer (G_TASK (result), error);
 161 }
 162
 163
 164 static void
 165 do_lookup_by_address (GTask         *task,
 166                       gpointer       source_object,
 167                       gpointer       task_data,
 168                       GCancellable  *cancellable)
 169 {
 170   GInetAddress *address = task_data;
 171   struct sockaddr_storage sockaddr;
 172   gsize sockaddr_size;
 173   GSocketAddress *gsockaddr;
 174   gchar name[NI_MAXHOST];
 175   gint retval;
 176
 177   gsockaddr = g_inet_socket_address_new (address, 0);
 178   g_socket_address_to_native (gsockaddr, (struct sockaddr *)&sockaddr,
 179                               sizeof (sockaddr), NULL);
 180   sockaddr_size = g_socket_address_get_native_size (gsockaddr);
 181   g_object_unref (gsockaddr);
 182
 183   retval = getnameinfo ((struct sockaddr *)&sockaddr, sockaddr_size,
 184                         name, sizeof (name), NULL, 0, NI_NAMEREQD);
 185   if (retval == 0)
 186     g_task_return_pointer (task, g_strdup (name), g_free);
 187   else
 188     {
 189       gchar *phys;
 190
 191       phys = g_inet_address_to_string (address);
 192       g_task_return_new_error (task,
 193                                G_RESOLVER_ERROR,
 194                                g_resolver_error_from_addrinfo_error (retval),
 195                                _("Error reverse-resolving '%s': %s"),
 196                                phys ? phys : "(unknown)",
 197                                gai_strerror (retval));
 198       g_free (phys);
 199     }
 200 }
 201
 202 static gchar *
 203 lookup_by_address (GResolver        *resolver,
 204                    GInetAddress     *address,
 205                    GCancellable     *cancellable,
 206                    GError          **error)
 207 {
 208   GTask *task;
 209   gchar *name;
 210
 211   task = g_task_new (resolver, cancellable, NULL, NULL);
 212   g_task_set_task_data (task, g_object_ref (address), g_object_unref);
 213   g_task_set_return_on_cancel (task, TRUE);
 214   g_task_run_in_thread_sync (task, do_lookup_by_address);
 215   name = g_task_propagate_pointer (task, error);
 216   g_object_unref (task);
 217
 218   return name;
 219 }
 220
 221 static void
 222 lookup_by_address_async (GResolver           *resolver,
 223                          GInetAddress        *address,
 224                          GCancellable        *cancellable,
 225                          GAsyncReadyCallback  callback,
 226                          gpointer             user_data)
 227 {
 228   GTask *task;
 229
 230   task = g_task_new (resolver, cancellable, callback, user_data);
 231   g_task_set_task_data (task, g_object_ref (address), g_object_unref);
 232   g_task_set_return_on_cancel (task, TRUE);
 233   g_task_run_in_thread (task, do_lookup_by_address);
 234   g_object_unref (task);
 235 }
 236
 237 static gchar *
 238 lookup_by_address_finish (GResolver     *resolver,
 239                           GAsyncResult  *result,
 240                           GError       **error)
 241 {
 242   g_return_val_if_fail (g_task_is_valid (result, resolver), NULL);
 243
 244   return g_task_propagate_pointer (G_TASK (result), error);
 245 }
 246
 247
 248 #if defined(G_OS_UNIX)
 249 static GVariant *
 250 parse_res_srv (guchar  *answer,
 251                guchar  *end,
 252                guchar **p)
 253 {
 254   gchar namebuf[1024];
 255   guint16 priority, weight, port;
 256
 257   GETSHORT (priority, *p);
 258   GETSHORT (weight, *p);
 259   GETSHORT (port, *p);
 260   *p += dn_expand (answer, end, *p, namebuf, sizeof (namebuf));
 261
 262   return g_variant_new ("(qqqs)",
 263                         priority,
 264                         weight,
 265                         port,
 266                         namebuf);
 267 }
 268
 269 static GVariant *
 270 parse_res_soa (guchar  *answer,
 271                guchar  *end,
 272                guchar **p)
 273 {
 274   gchar mnamebuf[1024];
 275   gchar rnamebuf[1024];
 276   guint32 serial, refresh, retry, expire, ttl;
 277
 278   *p += dn_expand (answer, end, *p, mnamebuf, sizeof (mnamebuf));
 279   *p += dn_expand (answer, end, *p, rnamebuf, sizeof (rnamebuf));
 280
 281   GETLONG (serial, *p);
 282   GETLONG (refresh, *p);
 283   GETLONG (retry, *p);
 284   GETLONG (expire, *p);
 285   GETLONG (ttl, *p);
 286
 287   return g_variant_new ("(ssuuuuu)",
 288                         mnamebuf,
 289                         rnamebuf,
 290                         serial,
 291                         refresh,
 292                         retry,
 293                         expire,
 294                         ttl);
 295 }
 296
 297 static GVariant *
 298 parse_res_ns (guchar  *answer,
 299               guchar  *end,
 300               guchar **p)
 301 {
 302   gchar namebuf[1024];
 303
 304   *p += dn_expand (answer, end, *p, namebuf, sizeof (namebuf));
 305
 306   return g_variant_new ("(s)", namebuf);
 307 }
 308
 309 static GVariant *
 310 parse_res_mx (guchar  *answer,
 311               guchar  *end,
 312               guchar **p)
 313 {
 314   gchar namebuf[1024];
 315   guint16 preference;
 316
 317   GETSHORT (preference, *p);
 318
 319   *p += dn_expand (answer, end, *p, namebuf, sizeof (namebuf));
 320
 321   return g_variant_new ("(qs)",
 322                         preference,
 323                         namebuf);
 324 }
 325
 326 static GVariant *
 327 parse_res_txt (guchar  *answer,
 328                guchar  *end,
 329                guchar **p)
 330 {
 331   GVariant *record;
 332   GPtrArray *array;
 333   guchar *at = *p;
 334   gsize len;
 335
 336   array = g_ptr_array_new_with_free_func (g_free);
 337   while (at < end)
 338     {
 339       len = *(at++);
 340       if (len > at - end)
 341         break;
 342       g_ptr_array_add (array, g_strndup ((gchar *)at, len));
 343       at += len;
 344     }
 345
 346   *p = at;
 347   record = g_variant_new ("(@as)",
 348                           g_variant_new_strv ((const gchar **)array->pdata, array->len));
 349   g_ptr_array_free (array, TRUE);
 350   return record;
 351 }
 352
 353 static gint
 354 g_resolver_record_type_to_rrtype (GResolverRecordType type)
 355 {
 356   switch (type)
 357   {
 358     case G_RESOLVER_RECORD_SRV:
 359       return T_SRV;
 360     case G_RESOLVER_RECORD_TXT:
 361       return T_TXT;
 362     case G_RESOLVER_RECORD_SOA:
 363       return T_SOA;
 364     case G_RESOLVER_RECORD_NS:
 365       return T_NS;
 366     case G_RESOLVER_RECORD_MX:
 367       return T_MX;
 368   }
 369   g_return_val_if_reached (-1);
 370 }
 371
 372 static GList *
 373 g_resolver_records_from_res_query (const gchar      *rrname,
 374                                    gint              rrtype,
 375                                    guchar           *answer,
 376                                    gint              len,
 377                                    gint              herr,
 378                                    GError          **error)
 379 {
 380   gint count;
 381   gchar namebuf[1024];
 382   guchar *end, *p;
 383   guint16 type, qclass, rdlength;
 384   guint32 ttl;
 385   HEADER *header;
 386   GList *records;
 387   GVariant *record;
 388
 389   if (len <= 0)
 390     {
 391       GResolverError errnum;
 392       const gchar *format;
 393
 394       if (len == 0 || herr == HOST_NOT_FOUND || herr == NO_DATA)
 395         {
 396           errnum = G_RESOLVER_ERROR_NOT_FOUND;
 397           format = _("No DNS record of the requested type for '%s'");
 398         }
 399       else if (herr == TRY_AGAIN)
 400         {
 401           errnum = G_RESOLVER_ERROR_TEMPORARY_FAILURE;
 402           format = _("Temporarily unable to resolve '%s'");
 403         }
 404       else
 405         {
 406           errnum = G_RESOLVER_ERROR_INTERNAL;
 407           format = _("Error resolving '%s'");
 408         }
 409
 410       g_set_error (error, G_RESOLVER_ERROR, errnum, format, rrname);
 411       return NULL;
 412     }
 413
 414   records = NULL;
 415
 416   header = (HEADER *)answer;
 417   p = answer + sizeof (HEADER);
 418   end = answer + len;
 419
 420   /* Skip query */
 421   count = ntohs (header->qdcount);
 422   while (count-- && p < end)
 423     {
 424       p += dn_expand (answer, end, p, namebuf, sizeof (namebuf));
 425       p += 4;
 426
 427       /* To silence gcc warnings */
 428       namebuf[0] = namebuf[1];
 429     }
 430
 431   /* Read answers */
 432   count = ntohs (header->ancount);
 433   while (count-- && p < end)
 434     {
 435       p += dn_expand (answer, end, p, namebuf, sizeof (namebuf));
 436       GETSHORT (type, p);
 437       GETSHORT (qclass, p);
 438       GETLONG  (ttl, p);
 439       ttl = ttl; /* To avoid -Wunused-but-set-variable */
 440       GETSHORT (rdlength, p);
 441
 442       if (type != rrtype || qclass != C_IN)
 443         {
 444           p += rdlength;
 445           continue;
 446         }
 447
 448       switch (rrtype)
 449         {
 450         case T_SRV:
 451           record = parse_res_srv (answer, end, &p);
 452           break;
 453         case T_MX:
 454           record = parse_res_mx (answer, end, &p);
 455           break;
 456         case T_SOA:
 457           record = parse_res_soa (answer, end, &p);
 458           break;
 459         case T_NS:
 460           record = parse_res_ns (answer, end, &p);
 461           break;
 462         case T_TXT:
 463           record = parse_res_txt (answer, p + rdlength, &p);
 464           break;
 465         default:
 466           g_warn_if_reached ();
 467           record = NULL;
 468           break;
 469         }
 470
 471       if (record != NULL)
 472         records = g_list_prepend (records, record);
 473     }
 474
 475     return records;
 476 }
 477
 478 #elif defined(G_OS_WIN32)
 479
 480 static GVariant *
 481 parse_dns_srv (DNS_RECORD *rec)
 482 {
 483   return g_variant_new ("(qqqs)",
 484                         (guint16)rec->Data.SRV.wPriority,
 485                         (guint16)rec->Data.SRV.wWeight,
 486                         (guint16)rec->Data.SRV.wPort,
 487                         rec->Data.SRV.pNameTarget);
 488 }
 489
 490 static GVariant *
 491 parse_dns_soa (DNS_RECORD *rec)
 492 {
 493   return g_variant_new ("(ssuuuuu)",
 494                         rec->Data.SOA.pNamePrimaryServer,
 495                         rec->Data.SOA.pNameAdministrator,
 496                         (guint32)rec->Data.SOA.dwSerialNo,
 497                         (guint32)rec->Data.SOA.dwRefresh,
 498                         (guint32)rec->Data.SOA.dwRetry,
 499                         (guint32)rec->Data.SOA.dwExpire,
 500                         (guint32)rec->Data.SOA.dwDefaultTtl);
 501 }
 502
 503 static GVariant *
 504 parse_dns_ns (DNS_RECORD *rec)
 505 {
 506   return g_variant_new ("(s)", rec->Data.NS.pNameHost);
 507 }
 508
 509 static GVariant *
 510 parse_dns_mx (DNS_RECORD *rec)
 511 {
 512   return g_variant_new ("(qs)",
 513                         (guint16)rec->Data.MX.wPreference,
 514                         rec->Data.MX.pNameExchange);
 515 }
 516
 517 static GVariant *
 518 parse_dns_txt (DNS_RECORD *rec)
 519 {
 520   GVariant *record;
 521   GPtrArray *array;
 522   DWORD i;
 523
 524   array = g_ptr_array_new ();
 525   for (i = 0; i < rec->Data.TXT.dwStringCount; i++)
 526     g_ptr_array_add (array, rec->Data.TXT.pStringArray[i]);
 527   record = g_variant_new ("(@as)",
 528                           g_variant_new_strv ((const gchar **)array->pdata, array->len));
 529   g_ptr_array_free (array, TRUE);
 530   return record;
 531 }
 532
 533 static WORD
 534 g_resolver_record_type_to_dnstype (GResolverRecordType type)
 535 {
 536   switch (type)
 537   {
 538     case G_RESOLVER_RECORD_SRV:
 539       return DNS_TYPE_SRV;
 540     case G_RESOLVER_RECORD_TXT:
 541       return DNS_TYPE_TEXT;
 542     case G_RESOLVER_RECORD_SOA:
 543       return DNS_TYPE_SOA;
 544     case G_RESOLVER_RECORD_NS:
 545       return DNS_TYPE_NS;
 546     case G_RESOLVER_RECORD_MX:
 547       return DNS_TYPE_MX;
 548   }
 549   g_return_val_if_reached (-1);
 550 }
 551
 552 static GList *
 553 g_resolver_records_from_DnsQuery (const gchar  *rrname,
 554                                   WORD          dnstype,
 555                                   DNS_STATUS    status,
 556                                   DNS_RECORD   *results,
 557                                   GError      **error)
 558 {
 559   DNS_RECORD *rec;
 560   gpointer record;
 561   GList *records;
 562
 563   if (status != ERROR_SUCCESS)
 564     {
 565       GResolverError errnum;
 566       const gchar *format;
 567
 568       if (status == DNS_ERROR_RCODE_NAME_ERROR)
 569         {
 570           errnum = G_RESOLVER_ERROR_NOT_FOUND;
 571           format = _("No DNS record of the requested type for '%s'");
 572         }
 573       else if (status == DNS_ERROR_RCODE_SERVER_FAILURE)
 574         {
 575           errnum = G_RESOLVER_ERROR_TEMPORARY_FAILURE;
 576           format = _("Temporarily unable to resolve '%s'");
 577         }
 578       else
 579         {
 580           errnum = G_RESOLVER_ERROR_INTERNAL;
 581           format = _("Error resolving '%s'");
 582         }
 583
 584       g_set_error (error, G_RESOLVER_ERROR, errnum, format, rrname);
 585       return NULL;
 586     }
 587
 588   records = NULL;
 589   for (rec = results; rec; rec = rec->pNext)
 590     {
 591       if (rec->wType != dnstype)
 592         continue;
 593       switch (dnstype)
 594         {
 595         case DNS_TYPE_SRV:
 596           record = parse_dns_srv (rec);
 597           break;
 598         case DNS_TYPE_SOA:
 599           record = parse_dns_soa (rec);
 600           break;
 601         case DNS_TYPE_NS:
 602           record = parse_dns_ns (rec);
 603           break;
 604         case DNS_TYPE_MX:
 605           record = parse_dns_mx (rec);
 606           break;
 607         case DNS_TYPE_TEXT:
 608           record = parse_dns_txt (rec);
 609           break;
 610         default:
 611           g_warn_if_reached ();
 612           record = NULL;
 613           break;
 614         }
 615       if (record != NULL)
 616         records = g_list_prepend (records, g_variant_ref_sink (record));
 617     }
 618
 619   return records;
 620 }
 621
 622 #endif
 623
 624 typedef struct {
 625   char *rrname;
 626   GResolverRecordType record_type;
 627 } LookupRecordsData;
 628
 629 static void
 630 free_lookup_records_data (LookupRecordsData *lrd)
 631 {
 632   g_free (lrd->rrname);
 633   g_slice_free (LookupRecordsData, lrd);
 634 }
 635
 636 static void
 637 free_records (GList *records)
 638 {
 639   g_list_free_full (records, (GDestroyNotify) g_variant_unref);
 640 }
 641
 642 static void
 643 do_lookup_records (GTask         *task,
 644                    gpointer       source_object,
 645                    gpointer       task_data,
 646                    GCancellable  *cancellable)
 647 {
 648   LookupRecordsData *lrd = task_data;
 649   GList *records;
 650   GError *error = NULL;
 651
 652 #if defined(G_OS_UNIX)
 653   gint len = 512;
 654   gint herr;
 655   GByteArray *answer;
 656   gint rrtype;
 657
 658   rrtype = g_resolver_record_type_to_rrtype (lrd->record_type);
 659   answer = g_byte_array_new ();
 660   for (;;)
 661     {
 662       g_byte_array_set_size (answer, len * 2);
 663       len = res_query (lrd->rrname, C_IN, rrtype, answer->data, answer->len);
 664
 665       /* If answer fit in the buffer then we're done */
 666       if (len < 0 || len < (gint)answer->len)
 667         break;
 668
 669       /*
 670        * On overflow some res_query's return the length needed, others
 671        * return the full length entered. This code works in either case.
 672        */
 673     }
 674
 675   herr = h_errno;
 676   records = g_resolver_records_from_res_query (lrd->rrname, rrtype, answer->data, len, herr, &error);
 677   g_byte_array_free (answer, TRUE);
 678
 679 #else
 680
 681   DNS_STATUS status;
 682   DNS_RECORD *results = NULL;
 683   WORD dnstype;
 684
 685   dnstype = g_resolver_record_type_to_dnstype (lrd->record_type);
 686   status = DnsQuery_A (lrd->rrname, dnstype, DNS_QUERY_STANDARD, NULL, &results, NULL);
 687   records = g_resolver_records_from_DnsQuery (lrd->rrname, dnstype, status, results, &error);
 688   if (results != NULL)
 689     DnsRecordListFree (results, DnsFreeRecordList);
 690
 691 #endif
 692
 693   if (records)
 694     g_task_return_pointer (task, records, (GDestroyNotify) free_records);
 695   else
 696     g_task_return_error (task, error);
 697 }
 698
 699 static GList *
 700 lookup_records (GResolver              *resolver,
 701                 const gchar            *rrname,
 702                 GResolverRecordType     record_type,
 703                 GCancellable           *cancellable,
 704                 GError                **error)
 705 {
 706   GTask *task;
 707   GList *records;
 708   LookupRecordsData *lrd;
 709
 710   task = g_task_new (resolver, cancellable, NULL, NULL);
 711
 712   lrd = g_slice_new (LookupRecordsData);
 713   lrd->rrname = g_strdup (rrname);
 714   lrd->record_type = record_type;
 715   g_task_set_task_data (task, lrd, (GDestroyNotify) free_lookup_records_data);
 716
 717   g_task_set_return_on_cancel (task, TRUE);
 718   g_task_run_in_thread_sync (task, do_lookup_records);
 719   records = g_task_propagate_pointer (task, error);
 720   g_object_unref (task);
 721
 722   return records;
 723 }
 724
 725 static void
 726 lookup_records_async (GResolver           *resolver,
 727                       const char          *rrname,
 728                       GResolverRecordType  record_type,
 729                       GCancellable        *cancellable,
 730                       GAsyncReadyCallback  callback,
 731                       gpointer             user_data)
 732 {
 733   GTask *task;
 734   LookupRecordsData *lrd;
 735
 736   task = g_task_new (resolver, cancellable, callback, user_data);
 737
 738   lrd = g_slice_new (LookupRecordsData);
 739   lrd->rrname = g_strdup (rrname);
 740   lrd->record_type = record_type;
 741   g_task_set_task_data (task, lrd, (GDestroyNotify) free_lookup_records_data);
 742
 743   g_task_set_return_on_cancel (task, TRUE);
 744   g_task_run_in_thread (task, do_lookup_records);
 745   g_object_unref (task);
 746 }
 747
 748 static GList *
 749 lookup_records_finish (GResolver     *resolver,
 750                        GAsyncResult  *result,
 751                        GError       **error)
 752 {
 753   g_return_val_if_fail (g_task_is_valid (result, resolver), NULL);
 754
 755   return g_task_propagate_pointer (G_TASK (result), error);
 756 }
 757
 758
 759 static void
 760 g_threaded_resolver_class_init (GThreadedResolverClass *threaded_class)
 761 {
 762   GResolverClass *resolver_class = G_RESOLVER_CLASS (threaded_class);
 763
 764   resolver_class->lookup_by_name           = lookup_by_name;
 765   resolver_class->lookup_by_name_async     = lookup_by_name_async;
 766   resolver_class->lookup_by_name_finish    = lookup_by_name_finish;
 767   resolver_class->lookup_by_address        = lookup_by_address;
 768   resolver_class->lookup_by_address_async  = lookup_by_address_async;
 769   resolver_class->lookup_by_address_finish = lookup_by_address_finish;
 770   resolver_class->lookup_records           = lookup_records;
 771   resolver_class->lookup_records_async     = lookup_records_async;
 772   resolver_class->lookup_records_finish    = lookup_records_finish;
 773
 774   /* Initialize _g_resolver_addrinfo_hints */
 775 #ifdef AI_ADDRCONFIG
 776   addrinfo_hints.ai_flags |= AI_ADDRCONFIG;
 777 #endif
 778   /* These two don't actually matter, they just get copied into the
 779    * returned addrinfo structures (and then we ignore them). But if
 780    * we leave them unset, we'll get back duplicate answers.
 781    */
 782   addrinfo_hints.ai_socktype = SOCK_STREAM;
 783   addrinfo_hints.ai_protocol = IPPROTO_TCP;
 784 }