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