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, 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   guint32 ttl;
 541   HEADER *header;
 542   GList *records;
 543   GVariant *record;
 544
 545   if (len <= 0)
 546     {
 547       if (len == 0 || herr == HOST_NOT_FOUND || herr == NO_DATA)
 548         {
 549           g_set_error (error, G_RESOLVER_ERROR, G_RESOLVER_ERROR_NOT_FOUND,
 550                        _("No DNS record of the requested type for “%s”"), rrname);
 551         }
 552       else if (herr == TRY_AGAIN)
 553         {
 554           g_set_error (error, G_RESOLVER_ERROR, G_RESOLVER_ERROR_TEMPORARY_FAILURE,
 555                        _("Temporarily unable to resolve “%s”"), rrname);
 556         }
 557       else
 558         {
 559           g_set_error (error, G_RESOLVER_ERROR, G_RESOLVER_ERROR_INTERNAL,
 560                        _("Error resolving “%s”"), rrname);
 561         }
 562
 563       return NULL;
 564     }
 565
 566   records = NULL;
 567
 568   header = (HEADER *)answer;
 569   p = answer + sizeof (HEADER);
 570   end = answer + len;
 571
 572   /* Skip query */
 573   count = ntohs (header->qdcount);
 574   while (count-- && p < end)
 575     {
 576       p += dn_expand (answer, end, p, namebuf, sizeof (namebuf));
 577       p += 4;
 578
 579       /* To silence gcc warnings */
 580       namebuf[0] = namebuf[1];
 581     }
 582
 583   /* Read answers */
 584   count = ntohs (header->ancount);
 585   while (count-- && p < end)
 586     {
 587       p += dn_expand (answer, end, p, namebuf, sizeof (namebuf));
 588       GETSHORT (type, p);
 589       GETSHORT (qclass, p);
 590       GETLONG  (ttl, p);
 591       ttl = ttl; /* To avoid -Wunused-but-set-variable */
 592       GETSHORT (rdlength, p);
 593
 594       if (type != rrtype || qclass != C_IN)
 595         {
 596           p += rdlength;
 597           continue;
 598         }
 599
 600       switch (rrtype)
 601         {
 602         case T_SRV:
 603           record = parse_res_srv (answer, end, &p);
 604           break;
 605         case T_MX:
 606           record = parse_res_mx (answer, end, &p);
 607           break;
 608         case T_SOA:
 609           record = parse_res_soa (answer, end, &p);
 610           break;
 611         case T_NS:
 612           record = parse_res_ns (answer, end, &p);
 613           break;
 614         case T_TXT:
 615           record = parse_res_txt (answer, p + rdlength, &p);
 616           break;
 617         default:
 618           g_warn_if_reached ();
 619           record = NULL;
 620           break;
 621         }
 622
 623       if (record != NULL)
 624         records = g_list_prepend (records, record);
 625     }
 626
 627   if (records == NULL)
 628     {
 629       g_set_error (error, G_RESOLVER_ERROR, G_RESOLVER_ERROR_NOT_FOUND,
 630                    _("No DNS record of the requested type for “%s”"), rrname);
 631
 632       return NULL;
 633     }
 634   else
 635     return records;
 636 }
 637
 638 #elif defined(G_OS_WIN32)
 639
 640 static GVariant *
 641 parse_dns_srv (DNS_RECORD *rec)
 642 {
 643   return g_variant_new ("(qqqs)",
 644                         (guint16)rec->Data.SRV.wPriority,
 645                         (guint16)rec->Data.SRV.wWeight,
 646                         (guint16)rec->Data.SRV.wPort,
 647                         rec->Data.SRV.pNameTarget);
 648 }
 649
 650 static GVariant *
 651 parse_dns_soa (DNS_RECORD *rec)
 652 {
 653   return g_variant_new ("(ssuuuuu)",
 654                         rec->Data.SOA.pNamePrimaryServer,
 655                         rec->Data.SOA.pNameAdministrator,
 656                         (guint32)rec->Data.SOA.dwSerialNo,
 657                         (guint32)rec->Data.SOA.dwRefresh,
 658                         (guint32)rec->Data.SOA.dwRetry,
 659                         (guint32)rec->Data.SOA.dwExpire,
 660                         (guint32)rec->Data.SOA.dwDefaultTtl);
 661 }
 662
 663 static GVariant *
 664 parse_dns_ns (DNS_RECORD *rec)
 665 {
 666   return g_variant_new ("(s)", rec->Data.NS.pNameHost);
 667 }
 668
 669 static GVariant *
 670 parse_dns_mx (DNS_RECORD *rec)
 671 {
 672   return g_variant_new ("(qs)",
 673                         (guint16)rec->Data.MX.wPreference,
 674                         rec->Data.MX.pNameExchange);
 675 }
 676
 677 static GVariant *
 678 parse_dns_txt (DNS_RECORD *rec)
 679 {
 680   GVariant *record;
 681   GPtrArray *array;
 682   DWORD i;
 683
 684   array = g_ptr_array_new ();
 685   for (i = 0; i < rec->Data.TXT.dwStringCount; i++)
 686     g_ptr_array_add (array, rec->Data.TXT.pStringArray[i]);
 687   record = g_variant_new ("(@as)",
 688                           g_variant_new_strv ((const gchar **)array->pdata, array->len));
 689   g_ptr_array_free (array, TRUE);
 690   return record;
 691 }
 692
 693 static WORD
 694 g_resolver_record_type_to_dnstype (GResolverRecordType type)
 695 {
 696   switch (type)
 697   {
 698     case G_RESOLVER_RECORD_SRV:
 699       return DNS_TYPE_SRV;
 700     case G_RESOLVER_RECORD_TXT:
 701       return DNS_TYPE_TEXT;
 702     case G_RESOLVER_RECORD_SOA:
 703       return DNS_TYPE_SOA;
 704     case G_RESOLVER_RECORD_NS:
 705       return DNS_TYPE_NS;
 706     case G_RESOLVER_RECORD_MX:
 707       return DNS_TYPE_MX;
 708   }
 709   g_return_val_if_reached (-1);
 710 }
 711
 712 static GList *
 713 g_resolver_records_from_DnsQuery (const gchar  *rrname,
 714                                   WORD          dnstype,
 715                                   DNS_STATUS    status,
 716                                   DNS_RECORD   *results,
 717                                   GError      **error)
 718 {
 719   DNS_RECORD *rec;
 720   gpointer record;
 721   GList *records;
 722
 723   if (status != ERROR_SUCCESS)
 724     {
 725       if (status == DNS_ERROR_RCODE_NAME_ERROR)
 726         {
 727           g_set_error (error, G_RESOLVER_ERROR, G_RESOLVER_ERROR_NOT_FOUND,
 728                        _("No DNS record of the requested type for “%s”"), rrname);
 729         }
 730       else if (status == DNS_ERROR_RCODE_SERVER_FAILURE)
 731         {
 732           g_set_error (error, G_RESOLVER_ERROR, G_RESOLVER_ERROR_TEMPORARY_FAILURE,
 733                        _("Temporarily unable to resolve “%s”"), rrname);
 734         }
 735       else
 736         {
 737           g_set_error (error, G_RESOLVER_ERROR, G_RESOLVER_ERROR_INTERNAL,
 738                        _("Error resolving “%s”"), rrname);
 739         }
 740
 741       return NULL;
 742     }
 743
 744   records = NULL;
 745   for (rec = results; rec; rec = rec->pNext)
 746     {
 747       if (rec->wType != dnstype)
 748         continue;
 749       switch (dnstype)
 750         {
 751         case DNS_TYPE_SRV:
 752           record = parse_dns_srv (rec);
 753           break;
 754         case DNS_TYPE_SOA:
 755           record = parse_dns_soa (rec);
 756           break;
 757         case DNS_TYPE_NS:
 758           record = parse_dns_ns (rec);
 759           break;
 760         case DNS_TYPE_MX:
 761           record = parse_dns_mx (rec);
 762           break;
 763         case DNS_TYPE_TEXT:
 764           record = parse_dns_txt (rec);
 765           break;
 766         default:
 767           g_warn_if_reached ();
 768           record = NULL;
 769           break;
 770         }
 771       if (record != NULL)
 772         records = g_list_prepend (records, g_variant_ref_sink (record));
 773     }
 774
 775   if (records == NULL)
 776     {
 777       g_set_error (error, G_RESOLVER_ERROR, G_RESOLVER_ERROR_NOT_FOUND,
 778                    _("No DNS record of the requested type for “%s”"), rrname);
 779
 780       return NULL;
 781     }
 782   else
 783     return records;
 784 }
 785
 786 #endif
 787
 788 typedef struct {
 789   char *rrname;
 790   GResolverRecordType record_type;
 791 } LookupRecordsData;
 792
 793 static void
 794 free_lookup_records_data (LookupRecordsData *lrd)
 795 {
 796   g_free (lrd->rrname);
 797   g_slice_free (LookupRecordsData, lrd);
 798 }
 799
 800 static void
 801 free_records (GList *records)
 802 {
 803   g_list_free_full (records, (GDestroyNotify) g_variant_unref);
 804 }
 805
 806 #if defined(G_OS_UNIX)
 807 #ifdef __BIONIC__
 808 #define C_IN 1
 809 int res_query(const char *, int, int, u_char *, int);
 810 #endif
 811 #endif
 812
 813 static void
 814 do_lookup_records (GTask         *task,
 815                    gpointer       source_object,
 816                    gpointer       task_data,
 817                    GCancellable  *cancellable)
 818 {
 819   LookupRecordsData *lrd = task_data;
 820   GList *records;
 821   GError *error = NULL;
 822
 823 #if defined(G_OS_UNIX)
 824   gint len = 512;
 825   gint herr;
 826   GByteArray *answer;
 827   gint rrtype;
 828
 829   rrtype = g_resolver_record_type_to_rrtype (lrd->record_type);
 830   answer = g_byte_array_new ();
 831   for (;;)
 832     {
 833       g_byte_array_set_size (answer, len * 2);
 834       len = res_query (lrd->rrname, C_IN, rrtype, answer->data, answer->len);
 835
 836       /* If answer fit in the buffer then we're done */
 837       if (len < 0 || len < (gint)answer->len)
 838         break;
 839
 840       /*
 841        * On overflow some res_query's return the length needed, others
 842        * return the full length entered. This code works in either case.
 843        */
 844     }
 845
 846   herr = h_errno;
 847   records = g_resolver_records_from_res_query (lrd->rrname, rrtype, answer->data, len, herr, &error);
 848   g_byte_array_free (answer, TRUE);
 849
 850 #else
 851
 852   DNS_STATUS status;
 853   DNS_RECORD *results = NULL;
 854   WORD dnstype;
 855
 856   dnstype = g_resolver_record_type_to_dnstype (lrd->record_type);
 857   status = DnsQuery_A (lrd->rrname, dnstype, DNS_QUERY_STANDARD, NULL, &results, NULL);
 858   records = g_resolver_records_from_DnsQuery (lrd->rrname, dnstype, status, results, &error);
 859   if (results != NULL)
 860     DnsRecordListFree (results, DnsFreeRecordList);
 861
 862 #endif
 863
 864   if (records)
 865     g_task_return_pointer (task, records, (GDestroyNotify) free_records);
 866   else
 867     g_task_return_error (task, error);
 868 }
 869
 870 static GList *
 871 lookup_records (GResolver              *resolver,
 872                 const gchar            *rrname,
 873                 GResolverRecordType     record_type,
 874                 GCancellable           *cancellable,
 875                 GError                **error)
 876 {
 877   GTask *task;
 878   GList *records;
 879   LookupRecordsData *lrd;
 880
 881   task = g_task_new (resolver, cancellable, NULL, NULL);
 882   g_task_set_source_tag (task, lookup_records);
 883
 884   lrd = g_slice_new (LookupRecordsData);
 885   lrd->rrname = g_strdup (rrname);
 886   lrd->record_type = record_type;
 887   g_task_set_task_data (task, lrd, (GDestroyNotify) free_lookup_records_data);
 888
 889   g_task_set_return_on_cancel (task, TRUE);
 890   g_task_run_in_thread_sync (task, do_lookup_records);
 891   records = g_task_propagate_pointer (task, error);
 892   g_object_unref (task);
 893
 894   return records;
 895 }
 896
 897 static void
 898 lookup_records_async (GResolver           *resolver,
 899                       const char          *rrname,
 900                       GResolverRecordType  record_type,
 901                       GCancellable        *cancellable,
 902                       GAsyncReadyCallback  callback,
 903                       gpointer             user_data)
 904 {
 905   GTask *task;
 906   LookupRecordsData *lrd;
 907
 908   task = g_task_new (resolver, cancellable, callback, user_data);
 909   g_task_set_source_tag (task, lookup_records_async);
 910
 911   lrd = g_slice_new (LookupRecordsData);
 912   lrd->rrname = g_strdup (rrname);
 913   lrd->record_type = record_type;
 914   g_task_set_task_data (task, lrd, (GDestroyNotify) free_lookup_records_data);
 915
 916   g_task_set_return_on_cancel (task, TRUE);
 917   g_task_run_in_thread (task, do_lookup_records);
 918   g_object_unref (task);
 919 }
 920
 921 static GList *
 922 lookup_records_finish (GResolver     *resolver,
 923                        GAsyncResult  *result,
 924                        GError       **error)
 925 {
 926   g_return_val_if_fail (g_task_is_valid (result, resolver), NULL);
 927
 928   return g_task_propagate_pointer (G_TASK (result), error);
 929 }
 930
 931
 932 static void
 933 g_threaded_resolver_class_init (GThreadedResolverClass *threaded_class)
 934 {
 935   GResolverClass *resolver_class = G_RESOLVER_CLASS (threaded_class);
 936
 937   resolver_class->lookup_by_name           = lookup_by_name;
 938   resolver_class->lookup_by_name_async     = lookup_by_name_async;
 939   resolver_class->lookup_by_name_finish    = lookup_by_name_finish;
 940   resolver_class->lookup_by_address        = lookup_by_address;
 941   resolver_class->lookup_by_address_async  = lookup_by_address_async;
 942   resolver_class->lookup_by_address_finish = lookup_by_address_finish;
 943   resolver_class->lookup_records           = lookup_records;
 944   resolver_class->lookup_records_async     = lookup_records_async;
 945   resolver_class->lookup_records_finish    = lookup_records_finish;
 946
 947   /* Initialize addrinfo_hints */
 948 #ifdef AI_ADDRCONFIG
 949   addrinfo_hints.ai_flags |= AI_ADDRCONFIG;
 950 #endif
 951   /* These two don't actually matter, they just get copied into the
 952    * returned addrinfo structures (and then we ignore them). But if
 953    * we leave them unset, we'll get back duplicate answers.
 954    */
 955   addrinfo_hints.ai_socktype = SOCK_STREAM;
 956   addrinfo_hints.ai_protocol = IPPROTO_TCP;
 957 }