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 2.1 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, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include "config.h"
  22 #include <glib.h>
  23 #include "glibintl.h"
  24
  25 #include <stdio.h>
  26 #include <string.h>
  27
  28 #include "gthreadedresolver.h"
  29 #include "gnetworkingprivate.h"
  30
  31 #include "gcancellable.h"
  32 #include "ginetaddress.h"
  33 #include "ginetsocketaddress.h"
  34 #include "gtask.h"
  35 #include "gsocketaddress.h"
  36 #include "gsrvtarget.h"
  37
  38
  39 G_DEFINE_TYPE (GThreadedResolver, g_threaded_resolver, G_TYPE_RESOLVER)
  40
  41 static void
  42 g_threaded_resolver_init (GThreadedResolver *gtr)
  43 {
  44 }
  45
  46 static GResolverError
  47 g_resolver_error_from_addrinfo_error (gint err)
  48 {
  49   switch (err)
  50     {
  51     case EAI_FAIL:
  52 #if defined(EAI_NODATA) && (EAI_NODATA != EAI_NONAME)
  53     case EAI_NODATA:
  54 #endif
  55     case EAI_NONAME:
  56       return G_RESOLVER_ERROR_NOT_FOUND;
  57
  58     case EAI_AGAIN:
  59       return G_RESOLVER_ERROR_TEMPORARY_FAILURE;
  60
  61     default:
  62       return G_RESOLVER_ERROR_INTERNAL;
  63     }
  64 }
  65
  66 static struct addrinfo addrinfo_hints;
  67
  68 static void
  69 do_lookup_by_name (GTask         *task,
  70                    gpointer       source_object,
  71                    gpointer       task_data,
  72                    GCancellable  *cancellable)
  73 {
  74   const char *hostname = task_data;
  75   struct addrinfo *res = NULL;
  76   GList *addresses;
  77   gint retval;
  78
  79   retval = getaddrinfo (hostname, NULL, &addrinfo_hints, &res);
  80
  81   if (retval == 0)
  82     {
  83       struct addrinfo *ai;
  84       GSocketAddress *sockaddr;
  85       GInetAddress *addr;
  86
  87       addresses = NULL;
  88       for (ai = res; ai; ai = ai->ai_next)
  89         {
  90           sockaddr = g_socket_address_new_from_native (ai->ai_addr, ai->ai_addrlen);
  91           if (!sockaddr)
  92             continue;
  93           if (!G_IS_INET_SOCKET_ADDRESS (sockaddr))
  94             {
  95               g_clear_object (&sockaddr);
  96               continue;
  97             }
  98
  99           addr = g_object_ref (g_inet_socket_address_get_address ((GInetSocketAddress *)sockaddr));
 100           addresses = g_list_prepend (addresses, addr);
 101           g_object_unref (sockaddr);
 102         }
 103
 104       if (addresses != NULL)
 105         {
 106           addresses = g_list_reverse (addresses);
 107           g_task_return_pointer (task, addresses,
 108                                  (GDestroyNotify)g_resolver_free_addresses);
 109         }
 110       else
 111         {
 112           /* All addresses failed to be converted to GSocketAddresses. */
 113           g_task_return_new_error (task,
 114                                    G_RESOLVER_ERROR,
 115                                    G_RESOLVER_ERROR_NOT_FOUND,
 116                                    _("Error resolving “%s”: %s"),
 117                                    hostname,
 118                                    _("No valid addresses were found"));
 119         }
 120     }
 121   else
 122     {
 123       g_task_return_new_error (task,
 124                                G_RESOLVER_ERROR,
 125                                g_resolver_error_from_addrinfo_error (retval),
 126                                _("Error resolving “%s”: %s"),
 127                                hostname, gai_strerror (retval));
 128     }
 129
 130   if (res)
 131     freeaddrinfo (res);
 132 }
 133
 134 static GList *
 135 lookup_by_name (GResolver     *resolver,
 136                 const gchar   *hostname,
 137                 GCancellable  *cancellable,
 138                 GError       **error)
 139 {
 140   GTask *task;
 141   GList *addresses;
 142
 143   task = g_task_new (resolver, cancellable, NULL, NULL);
 144   g_task_set_source_tag (task, lookup_by_name);
 145   g_task_set_task_data (task, g_strdup (hostname), g_free);
 146   g_task_set_return_on_cancel (task, TRUE);
 147   g_task_run_in_thread_sync (task, do_lookup_by_name);
 148   addresses = g_task_propagate_pointer (task, error);
 149   g_object_unref (task);
 150
 151   return addresses;
 152 }
 153
 154 static void
 155 lookup_by_name_async (GResolver           *resolver,
 156                       const gchar         *hostname,
 157                       GCancellable        *cancellable,
 158                       GAsyncReadyCallback  callback,
 159                       gpointer             user_data)
 160 {
 161   GTask *task;
 162
 163   task = g_task_new (resolver, cancellable, callback, user_data);
 164   g_task_set_source_tag (task, lookup_by_name_async);
 165   g_task_set_task_data (task, g_strdup (hostname), g_free);
 166   g_task_set_return_on_cancel (task, TRUE);
 167   g_task_run_in_thread (task, do_lookup_by_name);
 168   g_object_unref (task);
 169 }
 170
 171 static GList *
 172 lookup_by_name_finish (GResolver     *resolver,
 173                        GAsyncResult  *result,
 174                        GError       **error)
 175 {
 176   g_return_val_if_fail (g_task_is_valid (result, resolver), NULL);
 177
 178   return g_task_propagate_pointer (G_TASK (result), error);
 179 }
 180
 181
 182 static void
 183 do_lookup_by_address (GTask         *task,
 184                       gpointer       source_object,
 185                       gpointer       task_data,
 186                       GCancellable  *cancellable)
 187 {
 188   GInetAddress *address = task_data;
 189   struct sockaddr_storage sockaddr;
 190   gsize sockaddr_size;
 191   GSocketAddress *gsockaddr;
 192   gchar name[NI_MAXHOST];
 193   gint retval;
 194
 195   gsockaddr = g_inet_socket_address_new (address, 0);
 196   g_socket_address_to_native (gsockaddr, (struct sockaddr *)&sockaddr,
 197                               sizeof (sockaddr), NULL);
 198   sockaddr_size = g_socket_address_get_native_size (gsockaddr);
 199   g_object_unref (gsockaddr);
 200
 201   retval = getnameinfo ((struct sockaddr *)&sockaddr, sockaddr_size,
 202                         name, sizeof (name), NULL, 0, NI_NAMEREQD);
 203   if (retval == 0)
 204     g_task_return_pointer (task, g_strdup (name), g_free);
 205   else
 206     {
 207       gchar *phys;
 208
 209       phys = g_inet_address_to_string (address);
 210       g_task_return_new_error (task,
 211                                G_RESOLVER_ERROR,
 212                                g_resolver_error_from_addrinfo_error (retval),
 213                                _("Error reverse-resolving “%s”: %s"),
 214                                phys ? phys : "(unknown)",
 215                                gai_strerror (retval));
 216       g_free (phys);
 217     }
 218 }
 219
 220 static gchar *
 221 lookup_by_address (GResolver        *resolver,
 222                    GInetAddress     *address,
 223                    GCancellable     *cancellable,
 224                    GError          **error)
 225 {
 226   GTask *task;
 227   gchar *name;
 228
 229   task = g_task_new (resolver, cancellable, NULL, NULL);
 230   g_task_set_source_tag (task, lookup_by_address);
 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_sync (task, do_lookup_by_address);
 234   name = g_task_propagate_pointer (task, error);
 235   g_object_unref (task);
 236
 237   return name;
 238 }
 239
 240 static void
 241 lookup_by_address_async (GResolver           *resolver,
 242                          GInetAddress        *address,
 243                          GCancellable        *cancellable,
 244                          GAsyncReadyCallback  callback,
 245                          gpointer             user_data)
 246 {
 247   GTask *task;
 248
 249   task = g_task_new (resolver, cancellable, callback, user_data);
 250   g_task_set_source_tag (task, lookup_by_address_async);
 251   g_task_set_task_data (task, g_object_ref (address), g_object_unref);
 252   g_task_set_return_on_cancel (task, TRUE);
 253   g_task_run_in_thread (task, do_lookup_by_address);
 254   g_object_unref (task);
 255 }
 256
 257 static gchar *
 258 lookup_by_address_finish (GResolver     *resolver,
 259                           GAsyncResult  *result,
 260                           GError       **error)
 261 {
 262   g_return_val_if_fail (g_task_is_valid (result, resolver), NULL);
 263
 264   return g_task_propagate_pointer (G_TASK (result), error);
 265 }
 266
 267
 268 #if defined(G_OS_UNIX)
 269
 270 #if defined __BIONIC__ && !defined BIND_4_COMPAT
 271 /* Copy from bionic/libc/private/arpa_nameser_compat.h
 272  * and bionic/libc/private/arpa_nameser.h */
 273 typedef struct {
 274         unsigned        id :16;         /* query identification number */
 275 #if BYTE_ORDER == BIG_ENDIAN
 276                         /* fields in third byte */
 277         unsigned        qr: 1;          /* response flag */
 278         unsigned        opcode: 4;      /* purpose of message */
 279         unsigned        aa: 1;          /* authoritive answer */
 280         unsigned        tc: 1;          /* truncated message */
 281         unsigned        rd: 1;          /* recursion desired */
 282                         /* fields in fourth byte */
 283         unsigned        ra: 1;          /* recursion available */
 284         unsigned        unused :1;      /* unused bits (MBZ as of 4.9.3a3) */
 285         unsigned        ad: 1;          /* authentic data from named */
 286         unsigned        cd: 1;          /* checking disabled by resolver */
 287         unsigned        rcode :4;       /* response code */
 288 #endif
 289 #if BYTE_ORDER == LITTLE_ENDIAN || BYTE_ORDER == PDP_ENDIAN
 290                         /* fields in third byte */
 291         unsigned        rd :1;          /* recursion desired */
 292         unsigned        tc :1;          /* truncated message */
 293         unsigned        aa :1;          /* authoritive answer */
 294         unsigned        opcode :4;      /* purpose of message */
 295         unsigned        qr :1;          /* response flag */
 296                         /* fields in fourth byte */
 297         unsigned        rcode :4;       /* response code */
 298         unsigned        cd: 1;          /* checking disabled by resolver */
 299         unsigned        ad: 1;          /* authentic data from named */
 300         unsigned        unused :1;      /* unused bits (MBZ as of 4.9.3a3) */
 301         unsigned        ra :1;          /* recursion available */
 302 #endif
 303                         /* remaining bytes */
 304         unsigned        qdcount :16;    /* number of question entries */
 305         unsigned        ancount :16;    /* number of answer entries */
 306         unsigned        nscount :16;    /* number of authority entries */
 307         unsigned        arcount :16;    /* number of resource entries */
 308 } HEADER;
 309
 310 #define NS_INT32SZ      4       /* #/bytes of data in a uint32_t */
 311 #define NS_INT16SZ      2       /* #/bytes of data in a uint16_t */
 312
 313 #define NS_GET16(s, cp) do { \
 314         const u_char *t_cp = (const u_char *)(cp); \
 315         (s) = ((uint16_t)t_cp[0] << 8) \
 316             | ((uint16_t)t_cp[1]) \
 317             ; \
 318         (cp) += NS_INT16SZ; \
 319 } while (/*CONSTCOND*/0)
 320
 321 #define NS_GET32(l, cp) do { \
 322         const u_char *t_cp = (const u_char *)(cp); \
 323         (l) = ((uint32_t)t_cp[0] << 24) \
 324             | ((uint32_t)t_cp[1] << 16) \
 325             | ((uint32_t)t_cp[2] << 8) \
 326             | ((uint32_t)t_cp[3]) \
 327             ; \
 328         (cp) += NS_INT32SZ; \
 329 } while (/*CONSTCOND*/0)
 330
 331 #define GETSHORT                NS_GET16
 332 #define GETLONG                 NS_GET32
 333
 334 #define C_IN 1
 335
 336 /* From bionic/libc/private/resolv_private.h */
 337 int dn_expand(const u_char *, const u_char *, const u_char *, char *, int);
 338 #define dn_skipname __dn_skipname
 339 int dn_skipname(const u_char *, const u_char *);
 340
 341 /* From bionic/libc/private/arpa_nameser_compat.h */
 342 #define T_MX            ns_t_mx
 343 #define T_TXT           ns_t_txt
 344 #define T_SOA           ns_t_soa
 345 #define T_NS            ns_t_ns
 346
 347 /* From bionic/libc/private/arpa_nameser.h */
 348 typedef enum __ns_type {
 349         ns_t_invalid = 0,       /* Cookie. */
 350         ns_t_a = 1,             /* Host address. */
 351         ns_t_ns = 2,            /* Authoritative server. */
 352         ns_t_md = 3,            /* Mail destination. */
 353         ns_t_mf = 4,            /* Mail forwarder. */
 354         ns_t_cname = 5,         /* Canonical name. */
 355         ns_t_soa = 6,           /* Start of authority zone. */
 356         ns_t_mb = 7,            /* Mailbox domain name. */
 357         ns_t_mg = 8,            /* Mail group member. */
 358         ns_t_mr = 9,            /* Mail rename name. */
 359         ns_t_null = 10,         /* Null resource record. */
 360         ns_t_wks = 11,          /* Well known service. */
 361         ns_t_ptr = 12,          /* Domain name pointer. */
 362         ns_t_hinfo = 13,        /* Host information. */
 363         ns_t_minfo = 14,        /* Mailbox information. */
 364         ns_t_mx = 15,           /* Mail routing information. */
 365         ns_t_txt = 16,          /* Text strings. */
 366         ns_t_rp = 17,           /* Responsible person. */
 367         ns_t_afsdb = 18,        /* AFS cell database. */
 368         ns_t_x25 = 19,          /* X_25 calling address. */
 369         ns_t_isdn = 20,         /* ISDN calling address. */
 370         ns_t_rt = 21,           /* Router. */
 371         ns_t_nsap = 22,         /* NSAP address. */
 372         ns_t_nsap_ptr = 23,     /* Reverse NSAP lookup (deprecated). */
 373         ns_t_sig = 24,          /* Security signature. */
 374         ns_t_key = 25,          /* Security key. */
 375         ns_t_px = 26,           /* X.400 mail mapping. */
 376         ns_t_gpos = 27,         /* Geographical position (withdrawn). */
 377         ns_t_aaaa = 28,         /* Ip6 Address. */
 378         ns_t_loc = 29,          /* Location Information. */
 379         ns_t_nxt = 30,          /* Next domain (security). */
 380         ns_t_eid = 31,          /* Endpoint identifier. */
 381         ns_t_nimloc = 32,       /* Nimrod Locator. */
 382         ns_t_srv = 33,          /* Server Selection. */
 383         ns_t_atma = 34,         /* ATM Address */
 384         ns_t_naptr = 35,        /* Naming Authority PoinTeR */
 385         ns_t_kx = 36,           /* Key Exchange */
 386         ns_t_cert = 37,         /* Certification record */
 387         ns_t_a6 = 38,           /* IPv6 address (deprecates AAAA) */
 388         ns_t_dname = 39,        /* Non-terminal DNAME (for IPv6) */
 389         ns_t_sink = 40,         /* Kitchen sink (experimentatl) */
 390         ns_t_opt = 41,          /* EDNS0 option (meta-RR) */
 391         ns_t_apl = 42,          /* Address prefix list (RFC 3123) */
 392         ns_t_tkey = 249,        /* Transaction key */
 393         ns_t_tsig = 250,        /* Transaction signature. */
 394         ns_t_ixfr = 251,        /* Incremental zone transfer. */
 395         ns_t_axfr = 252,        /* Transfer zone of authority. */
 396         ns_t_mailb = 253,       /* Transfer mailbox records. */
 397         ns_t_maila = 254,       /* Transfer mail agent records. */
 398         ns_t_any = 255,         /* Wildcard match. */
 399         ns_t_zxfr = 256,        /* BIND-specific, nonstandard. */
 400         ns_t_max = 65536
 401 } ns_type;
 402
 403 #endif /* __BIONIC__ */
 404
 405 static GVariant *
 406 parse_res_srv (guchar  *answer,
 407                guchar  *end,
 408                guchar **p)
 409 {
 410   gchar namebuf[1024];
 411   guint16 priority, weight, port;
 412
 413   GETSHORT (priority, *p);
 414   GETSHORT (weight, *p);
 415   GETSHORT (port, *p);
 416   *p += dn_expand (answer, end, *p, namebuf, sizeof (namebuf));
 417
 418   return g_variant_new ("(qqqs)",
 419                         priority,
 420                         weight,
 421                         port,
 422                         namebuf);
 423 }
 424
 425 static GVariant *
 426 parse_res_soa (guchar  *answer,
 427                guchar  *end,
 428                guchar **p)
 429 {
 430   gchar mnamebuf[1024];
 431   gchar rnamebuf[1024];
 432   guint32 serial, refresh, retry, expire, ttl;
 433
 434   *p += dn_expand (answer, end, *p, mnamebuf, sizeof (mnamebuf));
 435   *p += dn_expand (answer, end, *p, rnamebuf, sizeof (rnamebuf));
 436
 437   GETLONG (serial, *p);
 438   GETLONG (refresh, *p);
 439   GETLONG (retry, *p);
 440   GETLONG (expire, *p);
 441   GETLONG (ttl, *p);
 442
 443   return g_variant_new ("(ssuuuuu)",
 444                         mnamebuf,
 445                         rnamebuf,
 446                         serial,
 447                         refresh,
 448                         retry,
 449                         expire,
 450                         ttl);
 451 }
 452
 453 static GVariant *
 454 parse_res_ns (guchar  *answer,
 455               guchar  *end,
 456               guchar **p)
 457 {
 458   gchar namebuf[1024];
 459
 460   *p += dn_expand (answer, end, *p, namebuf, sizeof (namebuf));
 461
 462   return g_variant_new ("(s)", namebuf);
 463 }
 464
 465 static GVariant *
 466 parse_res_mx (guchar  *answer,
 467               guchar  *end,
 468               guchar **p)
 469 {
 470   gchar namebuf[1024];
 471   guint16 preference;
 472
 473   GETSHORT (preference, *p);
 474
 475   *p += dn_expand (answer, end, *p, namebuf, sizeof (namebuf));
 476
 477   return g_variant_new ("(qs)",
 478                         preference,
 479                         namebuf);
 480 }
 481
 482 static GVariant *
 483 parse_res_txt (guchar  *answer,
 484                guchar  *end,
 485                guchar **p)
 486 {
 487   GVariant *record;
 488   GPtrArray *array;
 489   guchar *at = *p;
 490   gsize len;
 491
 492   array = g_ptr_array_new_with_free_func (g_free);
 493   while (at < end)
 494     {
 495       len = *(at++);
 496       if (len > at - end)
 497         break;
 498       g_ptr_array_add (array, g_strndup ((gchar *)at, len));
 499       at += len;
 500     }
 501
 502   *p = at;
 503   record = g_variant_new ("(@as)",
 504                           g_variant_new_strv ((const gchar **)array->pdata, array->len));
 505   g_ptr_array_free (array, TRUE);
 506   return record;
 507 }
 508
 509 static gint
 510 g_resolver_record_type_to_rrtype (GResolverRecordType type)
 511 {
 512   switch (type)
 513   {
 514     case G_RESOLVER_RECORD_SRV:
 515       return T_SRV;
 516     case G_RESOLVER_RECORD_TXT:
 517       return T_TXT;
 518     case G_RESOLVER_RECORD_SOA:
 519       return T_SOA;
 520     case G_RESOLVER_RECORD_NS:
 521       return T_NS;
 522     case G_RESOLVER_RECORD_MX:
 523       return T_MX;
 524   }
 525   g_return_val_if_reached (-1);
 526 }
 527
 528 static GList *
 529 g_resolver_records_from_res_query (const gchar      *rrname,
 530                                    gint              rrtype,
 531                                    guchar           *answer,
 532                                    gint              len,
 533                                    gint              herr,
 534                                    GError          **error)
 535 {
 536   gint count;
 537   gchar namebuf[1024];
 538   guchar *end, *p;
 539   guint16 type, qclass, rdlength;
 540   HEADER *header;
 541   GList *records;
 542   GVariant *record;
 543
 544   if (len <= 0)
 545     {
 546       if (len == 0 || herr == HOST_NOT_FOUND || herr == NO_DATA)
 547         {
 548           g_set_error (error, G_RESOLVER_ERROR, G_RESOLVER_ERROR_NOT_FOUND,
 549                        _("No DNS record of the requested type for “%s”"), rrname);
 550         }
 551       else if (herr == TRY_AGAIN)
 552         {
 553           g_set_error (error, G_RESOLVER_ERROR, G_RESOLVER_ERROR_TEMPORARY_FAILURE,
 554                        _("Temporarily unable to resolve “%s”"), rrname);
 555         }
 556       else
 557         {
 558           g_set_error (error, G_RESOLVER_ERROR, G_RESOLVER_ERROR_INTERNAL,
 559                        _("Error resolving “%s”"), rrname);
 560         }
 561
 562       return NULL;
 563     }
 564
 565   records = NULL;
 566
 567   header = (HEADER *)answer;
 568   p = answer + sizeof (HEADER);
 569   end = answer + len;
 570
 571   /* Skip query */
 572   count = ntohs (header->qdcount);
 573   while (count-- && p < end)
 574     {
 575       p += dn_expand (answer, end, p, namebuf, sizeof (namebuf));
 576       p += 4;
 577
 578       /* To silence gcc warnings */
 579       namebuf[0] = namebuf[1];
 580     }
 581
 582   /* Read answers */
 583   count = ntohs (header->ancount);
 584   while (count-- && p < end)
 585     {
 586       p += dn_expand (answer, end, p, namebuf, sizeof (namebuf));
 587       GETSHORT (type, p);
 588       GETSHORT (qclass, p);
 589       p += 4; /* ignore the ttl (type=long) value */
 590       GETSHORT (rdlength, p);
 591
 592       if (type != rrtype || qclass != C_IN)
 593         {
 594           p += rdlength;
 595           continue;
 596         }
 597
 598       switch (rrtype)
 599         {
 600         case T_SRV:
 601           record = parse_res_srv (answer, end, &p);
 602           break;
 603         case T_MX:
 604           record = parse_res_mx (answer, end, &p);
 605           break;
 606         case T_SOA:
 607           record = parse_res_soa (answer, end, &p);
 608           break;
 609         case T_NS:
 610           record = parse_res_ns (answer, end, &p);
 611           break;
 612         case T_TXT:
 613           record = parse_res_txt (answer, p + rdlength, &p);
 614           break;
 615         default:
 616           g_warn_if_reached ();
 617           record = NULL;
 618           break;
 619         }
 620
 621       if (record != NULL)
 622         records = g_list_prepend (records, record);
 623     }
 624
 625   if (records == NULL)
 626     {
 627       g_set_error (error, G_RESOLVER_ERROR, G_RESOLVER_ERROR_NOT_FOUND,
 628                    _("No DNS record of the requested type for “%s”"), rrname);
 629
 630       return NULL;
 631     }
 632   else
 633     return records;
 634 }
 635
 636 #elif defined(G_OS_WIN32)
 637
 638 static GVariant *
 639 parse_dns_srv (DNS_RECORD *rec)
 640 {
 641   return g_variant_new ("(qqqs)",
 642                         (guint16)rec->Data.SRV.wPriority,
 643                         (guint16)rec->Data.SRV.wWeight,
 644                         (guint16)rec->Data.SRV.wPort,
 645                         rec->Data.SRV.pNameTarget);
 646 }
 647
 648 static GVariant *
 649 parse_dns_soa (DNS_RECORD *rec)
 650 {
 651   return g_variant_new ("(ssuuuuu)",
 652                         rec->Data.SOA.pNamePrimaryServer,
 653                         rec->Data.SOA.pNameAdministrator,
 654                         (guint32)rec->Data.SOA.dwSerialNo,
 655                         (guint32)rec->Data.SOA.dwRefresh,
 656                         (guint32)rec->Data.SOA.dwRetry,
 657                         (guint32)rec->Data.SOA.dwExpire,
 658                         (guint32)rec->Data.SOA.dwDefaultTtl);
 659 }
 660
 661 static GVariant *
 662 parse_dns_ns (DNS_RECORD *rec)
 663 {
 664   return g_variant_new ("(s)", rec->Data.NS.pNameHost);
 665 }
 666
 667 static GVariant *
 668 parse_dns_mx (DNS_RECORD *rec)
 669 {
 670   return g_variant_new ("(qs)",
 671                         (guint16)rec->Data.MX.wPreference,
 672                         rec->Data.MX.pNameExchange);
 673 }
 674
 675 static GVariant *
 676 parse_dns_txt (DNS_RECORD *rec)
 677 {
 678   GVariant *record;
 679   GPtrArray *array;
 680   DWORD i;
 681
 682   array = g_ptr_array_new ();
 683   for (i = 0; i < rec->Data.TXT.dwStringCount; i++)
 684     g_ptr_array_add (array, rec->Data.TXT.pStringArray[i]);
 685   record = g_variant_new ("(@as)",
 686                           g_variant_new_strv ((const gchar **)array->pdata, array->len));
 687   g_ptr_array_free (array, TRUE);
 688   return record;
 689 }
 690
 691 static WORD
 692 g_resolver_record_type_to_dnstype (GResolverRecordType type)
 693 {
 694   switch (type)
 695   {
 696     case G_RESOLVER_RECORD_SRV:
 697       return DNS_TYPE_SRV;
 698     case G_RESOLVER_RECORD_TXT:
 699       return DNS_TYPE_TEXT;
 700     case G_RESOLVER_RECORD_SOA:
 701       return DNS_TYPE_SOA;
 702     case G_RESOLVER_RECORD_NS:
 703       return DNS_TYPE_NS;
 704     case G_RESOLVER_RECORD_MX:
 705       return DNS_TYPE_MX;
 706   }
 707   g_return_val_if_reached (-1);
 708 }
 709
 710 static GList *
 711 g_resolver_records_from_DnsQuery (const gchar  *rrname,
 712                                   WORD          dnstype,
 713                                   DNS_STATUS    status,
 714                                   DNS_RECORD   *results,
 715                                   GError      **error)
 716 {
 717   DNS_RECORD *rec;
 718   gpointer record;
 719   GList *records;
 720
 721   if (status != ERROR_SUCCESS)
 722     {
 723       if (status == DNS_ERROR_RCODE_NAME_ERROR)
 724         {
 725           g_set_error (error, G_RESOLVER_ERROR, G_RESOLVER_ERROR_NOT_FOUND,
 726                        _("No DNS record of the requested type for “%s”"), rrname);
 727         }
 728       else if (status == DNS_ERROR_RCODE_SERVER_FAILURE)
 729         {
 730           g_set_error (error, G_RESOLVER_ERROR, G_RESOLVER_ERROR_TEMPORARY_FAILURE,
 731                        _("Temporarily unable to resolve “%s”"), rrname);
 732         }
 733       else
 734         {
 735           g_set_error (error, G_RESOLVER_ERROR, G_RESOLVER_ERROR_INTERNAL,
 736                        _("Error resolving “%s”"), rrname);
 737         }
 738
 739       return NULL;
 740     }
 741
 742   records = NULL;
 743   for (rec = results; rec; rec = rec->pNext)
 744     {
 745       if (rec->wType != dnstype)
 746         continue;
 747       switch (dnstype)
 748         {
 749         case DNS_TYPE_SRV:
 750           record = parse_dns_srv (rec);
 751           break;
 752         case DNS_TYPE_SOA:
 753           record = parse_dns_soa (rec);
 754           break;
 755         case DNS_TYPE_NS:
 756           record = parse_dns_ns (rec);
 757           break;
 758         case DNS_TYPE_MX:
 759           record = parse_dns_mx (rec);
 760           break;
 761         case DNS_TYPE_TEXT:
 762           record = parse_dns_txt (rec);
 763           break;
 764         default:
 765           g_warn_if_reached ();
 766           record = NULL;
 767           break;
 768         }
 769       if (record != NULL)
 770         records = g_list_prepend (records, g_variant_ref_sink (record));
 771     }
 772
 773   if (records == NULL)
 774     {
 775       g_set_error (error, G_RESOLVER_ERROR, G_RESOLVER_ERROR_NOT_FOUND,
 776                    _("No DNS record of the requested type for “%s”"), rrname);
 777
 778       return NULL;
 779     }
 780   else
 781     return records;
 782 }
 783
 784 #endif
 785
 786 typedef struct {
 787   char *rrname;
 788   GResolverRecordType record_type;
 789 } LookupRecordsData;
 790
 791 static void
 792 free_lookup_records_data (LookupRecordsData *lrd)
 793 {
 794   g_free (lrd->rrname);
 795   g_slice_free (LookupRecordsData, lrd);
 796 }
 797
 798 static void
 799 free_records (GList *records)
 800 {
 801   g_list_free_full (records, (GDestroyNotify) g_variant_unref);
 802 }
 803
 804 #if defined(G_OS_UNIX)
 805 #ifdef __BIONIC__
 806 #define C_IN 1
 807 int res_query(const char *, int, int, u_char *, int);
 808 #endif
 809 #endif
 810
 811 static void
 812 do_lookup_records (GTask         *task,
 813                    gpointer       source_object,
 814                    gpointer       task_data,
 815                    GCancellable  *cancellable)
 816 {
 817   LookupRecordsData *lrd = task_data;
 818   GList *records;
 819   GError *error = NULL;
 820
 821 #if defined(G_OS_UNIX)
 822   gint len = 512;
 823   gint herr;
 824   GByteArray *answer;
 825   gint rrtype;
 826
 827   rrtype = g_resolver_record_type_to_rrtype (lrd->record_type);
 828   answer = g_byte_array_new ();
 829   for (;;)
 830     {
 831       g_byte_array_set_size (answer, len * 2);
 832       len = res_query (lrd->rrname, C_IN, rrtype, answer->data, answer->len);
 833
 834       /* If answer fit in the buffer then we're done */
 835       if (len < 0 || len < (gint)answer->len)
 836         break;
 837
 838       /*
 839        * On overflow some res_query's return the length needed, others
 840        * return the full length entered. This code works in either case.
 841        */
 842     }
 843
 844   herr = h_errno;
 845   records = g_resolver_records_from_res_query (lrd->rrname, rrtype, answer->data, len, herr, &error);
 846   g_byte_array_free (answer, TRUE);
 847
 848 #else
 849
 850   DNS_STATUS status;
 851   DNS_RECORD *results = NULL;
 852   WORD dnstype;
 853
 854   dnstype = g_resolver_record_type_to_dnstype (lrd->record_type);
 855   status = DnsQuery_A (lrd->rrname, dnstype, DNS_QUERY_STANDARD, NULL, &results, NULL);
 856   records = g_resolver_records_from_DnsQuery (lrd->rrname, dnstype, status, results, &error);
 857   if (results != NULL)
 858     DnsRecordListFree (results, DnsFreeRecordList);
 859
 860 #endif
 861
 862   if (records)
 863     g_task_return_pointer (task, records, (GDestroyNotify) free_records);
 864   else
 865     g_task_return_error (task, error);
 866 }
 867
 868 static GList *
 869 lookup_records (GResolver              *resolver,
 870                 const gchar            *rrname,
 871                 GResolverRecordType     record_type,
 872                 GCancellable           *cancellable,
 873                 GError                **error)
 874 {
 875   GTask *task;
 876   GList *records;
 877   LookupRecordsData *lrd;
 878
 879   task = g_task_new (resolver, cancellable, NULL, NULL);
 880   g_task_set_source_tag (task, lookup_records);
 881
 882   lrd = g_slice_new (LookupRecordsData);
 883   lrd->rrname = g_strdup (rrname);
 884   lrd->record_type = record_type;
 885   g_task_set_task_data (task, lrd, (GDestroyNotify) free_lookup_records_data);
 886
 887   g_task_set_return_on_cancel (task, TRUE);
 888   g_task_run_in_thread_sync (task, do_lookup_records);
 889   records = g_task_propagate_pointer (task, error);
 890   g_object_unref (task);
 891
 892   return records;
 893 }
 894
 895 static void
 896 lookup_records_async (GResolver           *resolver,
 897                       const char          *rrname,
 898                       GResolverRecordType  record_type,
 899                       GCancellable        *cancellable,
 900                       GAsyncReadyCallback  callback,
 901                       gpointer             user_data)
 902 {
 903   GTask *task;
 904   LookupRecordsData *lrd;
 905
 906   task = g_task_new (resolver, cancellable, callback, user_data);
 907   g_task_set_source_tag (task, lookup_records_async);
 908
 909   lrd = g_slice_new (LookupRecordsData);
 910   lrd->rrname = g_strdup (rrname);
 911   lrd->record_type = record_type;
 912   g_task_set_task_data (task, lrd, (GDestroyNotify) free_lookup_records_data);
 913
 914   g_task_set_return_on_cancel (task, TRUE);
 915   g_task_run_in_thread (task, do_lookup_records);
 916   g_object_unref (task);
 917 }
 918
 919 static GList *
 920 lookup_records_finish (GResolver     *resolver,
 921                        GAsyncResult  *result,
 922                        GError       **error)
 923 {
 924   g_return_val_if_fail (g_task_is_valid (result, resolver), NULL);
 925
 926   return g_task_propagate_pointer (G_TASK (result), error);
 927 }
 928
 929
 930 static void
 931 g_threaded_resolver_class_init (GThreadedResolverClass *threaded_class)
 932 {
 933   GResolverClass *resolver_class = G_RESOLVER_CLASS (threaded_class);
 934
 935   resolver_class->lookup_by_name           = lookup_by_name;
 936   resolver_class->lookup_by_name_async     = lookup_by_name_async;
 937   resolver_class->lookup_by_name_finish    = lookup_by_name_finish;
 938   resolver_class->lookup_by_address        = lookup_by_address;
 939   resolver_class->lookup_by_address_async  = lookup_by_address_async;
 940   resolver_class->lookup_by_address_finish = lookup_by_address_finish;
 941   resolver_class->lookup_records           = lookup_records;
 942   resolver_class->lookup_records_async     = lookup_records_async;
 943   resolver_class->lookup_records_finish    = lookup_records_finish;
 944
 945   /* Initialize addrinfo_hints */
 946 #ifdef AI_ADDRCONFIG
 947   addrinfo_hints.ai_flags |= AI_ADDRCONFIG;
 948 #endif
 949   /* These two don't actually matter, they just get copied into the
 950    * returned addrinfo structures (and then we ignore them). But if
 951    * we leave them unset, we'll get back duplicate answers.
 952    */
 953   addrinfo_hints.ai_socktype = SOCK_STREAM;
 954   addrinfo_hints.ai_protocol = IPPROTO_TCP;
 955 }