gthreadedresolver.c 27.4 KB
Newer Older
1 2 3
/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */

/* GIO - GLib Input, Output and Streaming Library
Matthias Clasen's avatar
Matthias Clasen committed
4
 *
5 6 7 8 9 10 11 12 13 14 15 16 17
 * Copyright (C) 2008 Red Hat, Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * 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 22 23 24 25 26 27 28 29 30 31
 */

#include "config.h"
#include <glib.h>
#include "glibintl.h"

#include <stdio.h>
#include <string.h>

#include "gthreadedresolver.h"
#include "gnetworkingprivate.h"

#include "gcancellable.h"
32 33
#include "ginetaddress.h"
#include "ginetsocketaddress.h"
34
#include "gtask.h"
35
#include "gsocketaddress.h"
36
#include "gsrvtarget.h"
37 38 39 40 41 42 43 44 45


G_DEFINE_TYPE (GThreadedResolver, g_threaded_resolver, G_TYPE_RESOLVER)

static void
g_threaded_resolver_init (GThreadedResolver *gtr)
{
}

46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67
static GResolverError
g_resolver_error_from_addrinfo_error (gint err)
{
  switch (err)
    {
    case EAI_FAIL:
#if defined(EAI_NODATA) && (EAI_NODATA != EAI_NONAME)
    case EAI_NODATA:
#endif
    case EAI_NONAME:
      return G_RESOLVER_ERROR_NOT_FOUND;

    case EAI_AGAIN:
      return G_RESOLVER_ERROR_TEMPORARY_FAILURE;

    default:
      return G_RESOLVER_ERROR_INTERNAL;
    }
}

static struct addrinfo addrinfo_hints;

68
static void
69 70 71 72
do_lookup_by_name (GTask         *task,
                   gpointer       source_object,
                   gpointer       task_data,
                   GCancellable  *cancellable)
73
{
74
  const char *hostname = task_data;
75
  struct addrinfo *res = NULL;
76
  GList *addresses;
77 78
  gint retval;

79
  retval = getaddrinfo (hostname, NULL, &addrinfo_hints, &res);
80

81
  if (retval == 0)
82
    {
83 84 85 86 87 88 89 90
      struct addrinfo *ai;
      GSocketAddress *sockaddr;
      GInetAddress *addr;

      addresses = NULL;
      for (ai = res; ai; ai = ai->ai_next)
        {
          sockaddr = g_socket_address_new_from_native (ai->ai_addr, ai->ai_addrlen);
91
          if (!sockaddr)
92
            continue;
93 94 95 96 97
          if (!G_IS_INET_SOCKET_ADDRESS (sockaddr))
            {
              g_clear_object (&sockaddr);
              continue;
            }
98 99 100 101 102 103

          addr = g_object_ref (g_inet_socket_address_get_address ((GInetSocketAddress *)sockaddr));
          addresses = g_list_prepend (addresses, addr);
          g_object_unref (sockaddr);
        }

104 105 106 107 108 109 110 111 112 113 114 115
      if (addresses != NULL)
        {
          addresses = g_list_reverse (addresses);
          g_task_return_pointer (task, addresses,
                                 (GDestroyNotify)g_resolver_free_addresses);
        }
      else
        {
          /* All addresses failed to be converted to GSocketAddresses. */
          g_task_return_new_error (task,
                                   G_RESOLVER_ERROR,
                                   G_RESOLVER_ERROR_NOT_FOUND,
116
                                   _("Error resolving “%s”: %s"),
117 118 119
                                   hostname,
                                   _("No valid addresses were found"));
        }
120 121
    }
  else
122 123 124 125
    {
      g_task_return_new_error (task,
                               G_RESOLVER_ERROR,
                               g_resolver_error_from_addrinfo_error (retval),
126
                               _("Error resolving “%s”: %s"),
127 128 129 130 131
                               hostname, gai_strerror (retval));
    }

  if (res)
    freeaddrinfo (res);
132 133 134 135 136 137 138 139
}

static GList *
lookup_by_name (GResolver     *resolver,
                const gchar   *hostname,
                GCancellable  *cancellable,
                GError       **error)
{
140
  GTask *task;
141 142
  GList *addresses;

143
  task = g_task_new (resolver, cancellable, NULL, NULL);
144
  g_task_set_source_tag (task, lookup_by_name);
145 146 147 148 149
  g_task_set_task_data (task, g_strdup (hostname), g_free);
  g_task_set_return_on_cancel (task, TRUE);
  g_task_run_in_thread_sync (task, do_lookup_by_name);
  addresses = g_task_propagate_pointer (task, error);
  g_object_unref (task);
150 151 152 153 154 155 156 157 158 159 160

  return addresses;
}

static void
lookup_by_name_async (GResolver           *resolver,
                      const gchar         *hostname,
                      GCancellable        *cancellable,
                      GAsyncReadyCallback  callback,
                      gpointer             user_data)
{
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);
165 166 167 168
  g_task_set_task_data (task, g_strdup (hostname), g_free);
  g_task_set_return_on_cancel (task, TRUE);
  g_task_run_in_thread (task, do_lookup_by_name);
  g_object_unref (task);
169 170 171 172 173 174 175
}

static GList *
lookup_by_name_finish (GResolver     *resolver,
                       GAsyncResult  *result,
                       GError       **error)
{
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
183 184 185 186
do_lookup_by_address (GTask         *task,
                      gpointer       source_object,
                      gpointer       task_data,
                      GCancellable  *cancellable)
187
{
188
  GInetAddress *address = task_data;
189 190
  struct sockaddr_storage sockaddr;
  gsize sockaddr_size;
191 192
  GSocketAddress *gsockaddr;
  gchar name[NI_MAXHOST];
193 194
  gint retval;

195 196 197 198 199
  gsockaddr = g_inet_socket_address_new (address, 0);
  g_socket_address_to_native (gsockaddr, (struct sockaddr *)&sockaddr,
                              sizeof (sockaddr), NULL);
  sockaddr_size = g_socket_address_get_native_size (gsockaddr);
  g_object_unref (gsockaddr);
200

201 202 203 204
  retval = getnameinfo ((struct sockaddr *)&sockaddr, sockaddr_size,
                        name, sizeof (name), NULL, 0, NI_NAMEREQD);
  if (retval == 0)
    g_task_return_pointer (task, g_strdup (name), g_free);
205
  else
206 207 208 209 210 211 212
    {
      gchar *phys;

      phys = g_inet_address_to_string (address);
      g_task_return_new_error (task,
                               G_RESOLVER_ERROR,
                               g_resolver_error_from_addrinfo_error (retval),
213
                               _("Error reverse-resolving “%s”: %s"),
214 215 216 217
                               phys ? phys : "(unknown)",
                               gai_strerror (retval));
      g_free (phys);
    }
218 219 220 221 222 223 224 225
}

static gchar *
lookup_by_address (GResolver        *resolver,
                   GInetAddress     *address,
                   GCancellable     *cancellable,
                   GError          **error)
{
226
  GTask *task;
227 228
  gchar *name;

229
  task = g_task_new (resolver, cancellable, NULL, NULL);
230
  g_task_set_source_tag (task, lookup_by_address);
231 232 233 234 235
  g_task_set_task_data (task, g_object_ref (address), g_object_unref);
  g_task_set_return_on_cancel (task, TRUE);
  g_task_run_in_thread_sync (task, do_lookup_by_address);
  name = g_task_propagate_pointer (task, error);
  g_object_unref (task);
236 237 238 239 240 241 242 243 244 245 246

  return name;
}

static void
lookup_by_address_async (GResolver           *resolver,
                         GInetAddress        *address,
                         GCancellable        *cancellable,
                         GAsyncReadyCallback  callback,
                         gpointer             user_data)
{
247 248 249
  GTask *task;

  task = g_task_new (resolver, cancellable, callback, user_data);
250
  g_task_set_source_tag (task, lookup_by_address_async);
251 252 253 254
  g_task_set_task_data (task, g_object_ref (address), g_object_unref);
  g_task_set_return_on_cancel (task, TRUE);
  g_task_run_in_thread (task, do_lookup_by_address);
  g_object_unref (task);
255 256 257 258 259 260 261
}

static gchar *
lookup_by_address_finish (GResolver     *resolver,
                          GAsyncResult  *result,
                          GError       **error)
{
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
271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404
/* Copy from bionic/libc/private/arpa_nameser_compat.h
 * and bionic/libc/private/arpa_nameser.h */
typedef struct {
	unsigned	id :16;		/* query identification number */
#if BYTE_ORDER == BIG_ENDIAN
			/* fields in third byte */
	unsigned	qr: 1;		/* response flag */
	unsigned	opcode: 4;	/* purpose of message */
	unsigned	aa: 1;		/* authoritive answer */
	unsigned	tc: 1;		/* truncated message */
	unsigned	rd: 1;		/* recursion desired */
			/* fields in fourth byte */
	unsigned	ra: 1;		/* recursion available */
	unsigned	unused :1;	/* unused bits (MBZ as of 4.9.3a3) */
	unsigned	ad: 1;		/* authentic data from named */
	unsigned	cd: 1;		/* checking disabled by resolver */
	unsigned	rcode :4;	/* response code */
#endif
#if BYTE_ORDER == LITTLE_ENDIAN || BYTE_ORDER == PDP_ENDIAN
			/* fields in third byte */
	unsigned	rd :1;		/* recursion desired */
	unsigned	tc :1;		/* truncated message */
	unsigned	aa :1;		/* authoritive answer */
	unsigned	opcode :4;	/* purpose of message */
	unsigned	qr :1;		/* response flag */
			/* fields in fourth byte */
	unsigned	rcode :4;	/* response code */
	unsigned	cd: 1;		/* checking disabled by resolver */
	unsigned	ad: 1;		/* authentic data from named */
	unsigned	unused :1;	/* unused bits (MBZ as of 4.9.3a3) */
	unsigned	ra :1;		/* recursion available */
#endif
			/* remaining bytes */
	unsigned	qdcount :16;	/* number of question entries */
	unsigned	ancount :16;	/* number of answer entries */
	unsigned	nscount :16;	/* number of authority entries */
	unsigned	arcount :16;	/* number of resource entries */
} HEADER;

#define NS_INT32SZ	4	/* #/bytes of data in a uint32_t */
#define NS_INT16SZ	2	/* #/bytes of data in a uint16_t */

#define NS_GET16(s, cp) do { \
	const u_char *t_cp = (const u_char *)(cp); \
	(s) = ((uint16_t)t_cp[0] << 8) \
	    | ((uint16_t)t_cp[1]) \
	    ; \
	(cp) += NS_INT16SZ; \
} while (/*CONSTCOND*/0)

#define NS_GET32(l, cp) do { \
	const u_char *t_cp = (const u_char *)(cp); \
	(l) = ((uint32_t)t_cp[0] << 24) \
	    | ((uint32_t)t_cp[1] << 16) \
	    | ((uint32_t)t_cp[2] << 8) \
	    | ((uint32_t)t_cp[3]) \
	    ; \
	(cp) += NS_INT32SZ; \
} while (/*CONSTCOND*/0)

#define	GETSHORT		NS_GET16
#define	GETLONG			NS_GET32

#define C_IN 1

/* From bionic/libc/private/resolv_private.h */
int dn_expand(const u_char *, const u_char *, const u_char *, char *, int);
#define dn_skipname __dn_skipname
int dn_skipname(const u_char *, const u_char *);

/* From bionic/libc/private/arpa_nameser_compat.h */
#define T_MX		ns_t_mx
#define T_TXT		ns_t_txt
#define T_SOA		ns_t_soa
#define T_NS		ns_t_ns

/* From bionic/libc/private/arpa_nameser.h */
typedef enum __ns_type {
	ns_t_invalid = 0,	/* Cookie. */
	ns_t_a = 1,		/* Host address. */
	ns_t_ns = 2,		/* Authoritative server. */
	ns_t_md = 3,		/* Mail destination. */
	ns_t_mf = 4,		/* Mail forwarder. */
	ns_t_cname = 5,		/* Canonical name. */
	ns_t_soa = 6,		/* Start of authority zone. */
	ns_t_mb = 7,		/* Mailbox domain name. */
	ns_t_mg = 8,		/* Mail group member. */
	ns_t_mr = 9,		/* Mail rename name. */
	ns_t_null = 10,		/* Null resource record. */
	ns_t_wks = 11,		/* Well known service. */
	ns_t_ptr = 12,		/* Domain name pointer. */
	ns_t_hinfo = 13,	/* Host information. */
	ns_t_minfo = 14,	/* Mailbox information. */
	ns_t_mx = 15,		/* Mail routing information. */
	ns_t_txt = 16,		/* Text strings. */
	ns_t_rp = 17,		/* Responsible person. */
	ns_t_afsdb = 18,	/* AFS cell database. */
	ns_t_x25 = 19,		/* X_25 calling address. */
	ns_t_isdn = 20,		/* ISDN calling address. */
	ns_t_rt = 21,		/* Router. */
	ns_t_nsap = 22,		/* NSAP address. */
	ns_t_nsap_ptr = 23,	/* Reverse NSAP lookup (deprecated). */
	ns_t_sig = 24,		/* Security signature. */
	ns_t_key = 25,		/* Security key. */
	ns_t_px = 26,		/* X.400 mail mapping. */
	ns_t_gpos = 27,		/* Geographical position (withdrawn). */
	ns_t_aaaa = 28,		/* Ip6 Address. */
	ns_t_loc = 29,		/* Location Information. */
	ns_t_nxt = 30,		/* Next domain (security). */
	ns_t_eid = 31,		/* Endpoint identifier. */
	ns_t_nimloc = 32,	/* Nimrod Locator. */
	ns_t_srv = 33,		/* Server Selection. */
	ns_t_atma = 34,		/* ATM Address */
	ns_t_naptr = 35,	/* Naming Authority PoinTeR */
	ns_t_kx = 36,		/* Key Exchange */
	ns_t_cert = 37,		/* Certification record */
	ns_t_a6 = 38,		/* IPv6 address (deprecates AAAA) */
	ns_t_dname = 39,	/* Non-terminal DNAME (for IPv6) */
	ns_t_sink = 40,		/* Kitchen sink (experimentatl) */
	ns_t_opt = 41,		/* EDNS0 option (meta-RR) */
	ns_t_apl = 42,		/* Address prefix list (RFC 3123) */
	ns_t_tkey = 249,	/* Transaction key */
	ns_t_tsig = 250,	/* Transaction signature. */
	ns_t_ixfr = 251,	/* Incremental zone transfer. */
	ns_t_axfr = 252,	/* Transfer zone of authority. */
	ns_t_mailb = 253,	/* Transfer mailbox records. */
	ns_t_maila = 254,	/* Transfer mail agent records. */
	ns_t_any = 255,		/* Wildcard match. */
	ns_t_zxfr = 256,	/* BIND-specific, nonstandard. */
	ns_t_max = 65536
} ns_type;

#endif /* __BIONIC__ */

405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548
static GVariant *
parse_res_srv (guchar  *answer,
               guchar  *end,
               guchar **p)
{
  gchar namebuf[1024];
  guint16 priority, weight, port;

  GETSHORT (priority, *p);
  GETSHORT (weight, *p);
  GETSHORT (port, *p);
  *p += dn_expand (answer, end, *p, namebuf, sizeof (namebuf));

  return g_variant_new ("(qqqs)",
                        priority,
                        weight,
                        port,
                        namebuf);
}

static GVariant *
parse_res_soa (guchar  *answer,
               guchar  *end,
               guchar **p)
{
  gchar mnamebuf[1024];
  gchar rnamebuf[1024];
  guint32 serial, refresh, retry, expire, ttl;

  *p += dn_expand (answer, end, *p, mnamebuf, sizeof (mnamebuf));
  *p += dn_expand (answer, end, *p, rnamebuf, sizeof (rnamebuf));

  GETLONG (serial, *p);
  GETLONG (refresh, *p);
  GETLONG (retry, *p);
  GETLONG (expire, *p);
  GETLONG (ttl, *p);

  return g_variant_new ("(ssuuuuu)",
                        mnamebuf,
                        rnamebuf,
                        serial,
                        refresh,
                        retry,
                        expire,
                        ttl);
}

static GVariant *
parse_res_ns (guchar  *answer,
              guchar  *end,
              guchar **p)
{
  gchar namebuf[1024];

  *p += dn_expand (answer, end, *p, namebuf, sizeof (namebuf));

  return g_variant_new ("(s)", namebuf);
}

static GVariant *
parse_res_mx (guchar  *answer,
              guchar  *end,
              guchar **p)
{
  gchar namebuf[1024];
  guint16 preference;

  GETSHORT (preference, *p);

  *p += dn_expand (answer, end, *p, namebuf, sizeof (namebuf));

  return g_variant_new ("(qs)",
                        preference,
                        namebuf);
}

static GVariant *
parse_res_txt (guchar  *answer,
               guchar  *end,
               guchar **p)
{
  GVariant *record;
  GPtrArray *array;
  guchar *at = *p;
  gsize len;

  array = g_ptr_array_new_with_free_func (g_free);
  while (at < end)
    {
      len = *(at++);
      if (len > at - end)
        break;
      g_ptr_array_add (array, g_strndup ((gchar *)at, len));
      at += len;
    }

  *p = at;
  record = g_variant_new ("(@as)",
                          g_variant_new_strv ((const gchar **)array->pdata, array->len));
  g_ptr_array_free (array, TRUE);
  return record;
}

static gint
g_resolver_record_type_to_rrtype (GResolverRecordType type)
{
  switch (type)
  {
    case G_RESOLVER_RECORD_SRV:
      return T_SRV;
    case G_RESOLVER_RECORD_TXT:
      return T_TXT;
    case G_RESOLVER_RECORD_SOA:
      return T_SOA;
    case G_RESOLVER_RECORD_NS:
      return T_NS;
    case G_RESOLVER_RECORD_MX:
      return T_MX;
  }
  g_return_val_if_reached (-1);
}

static GList *
g_resolver_records_from_res_query (const gchar      *rrname,
                                   gint              rrtype,
                                   guchar           *answer,
                                   gint              len,
                                   gint              herr,
                                   GError          **error)
{
  gint count;
  gchar namebuf[1024];
  guchar *end, *p;
  guint16 type, qclass, rdlength;
  guint32 ttl;
  HEADER *header;
  GList *records;
  GVariant *record;

  if (len <= 0)
    {
      if (len == 0 || herr == HOST_NOT_FOUND || herr == NO_DATA)
        {
549
          g_set_error (error, G_RESOLVER_ERROR, G_RESOLVER_ERROR_NOT_FOUND,
550
                       _("No DNS record of the requested type for “%s”"), rrname);
551 552 553
        }
      else if (herr == TRY_AGAIN)
        {
554
          g_set_error (error, G_RESOLVER_ERROR, G_RESOLVER_ERROR_TEMPORARY_FAILURE,
555
                       _("Temporarily unable to resolve “%s”"), rrname);
556 557 558
        }
      else
        {
559
          g_set_error (error, G_RESOLVER_ERROR, G_RESOLVER_ERROR_INTERNAL,
560
                       _("Error resolving “%s”"), rrname);
561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626
        }

      return NULL;
    }

  records = NULL;

  header = (HEADER *)answer;
  p = answer + sizeof (HEADER);
  end = answer + len;

  /* Skip query */
  count = ntohs (header->qdcount);
  while (count-- && p < end)
    {
      p += dn_expand (answer, end, p, namebuf, sizeof (namebuf));
      p += 4;

      /* To silence gcc warnings */
      namebuf[0] = namebuf[1];
    }

  /* Read answers */
  count = ntohs (header->ancount);
  while (count-- && p < end)
    {
      p += dn_expand (answer, end, p, namebuf, sizeof (namebuf));
      GETSHORT (type, p);
      GETSHORT (qclass, p);
      GETLONG  (ttl, p);
      ttl = ttl; /* To avoid -Wunused-but-set-variable */
      GETSHORT (rdlength, p);

      if (type != rrtype || qclass != C_IN)
        {
          p += rdlength;
          continue;
        }

      switch (rrtype)
        {
        case T_SRV:
          record = parse_res_srv (answer, end, &p);
          break;
        case T_MX:
          record = parse_res_mx (answer, end, &p);
          break;
        case T_SOA:
          record = parse_res_soa (answer, end, &p);
          break;
        case T_NS:
          record = parse_res_ns (answer, end, &p);
          break;
        case T_TXT:
          record = parse_res_txt (answer, p + rdlength, &p);
          break;
        default:
          g_warn_if_reached ();
          record = NULL;
          break;
        }

      if (record != NULL)
        records = g_list_prepend (records, record);
    }

627 628 629
  if (records == NULL)
    {
      g_set_error (error, G_RESOLVER_ERROR, G_RESOLVER_ERROR_NOT_FOUND,
630
                   _("No DNS record of the requested type for “%s”"), rrname);
631 632 633 634

      return NULL;
    }
  else
635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726
    return records;
}

#elif defined(G_OS_WIN32)

static GVariant *
parse_dns_srv (DNS_RECORD *rec)
{
  return g_variant_new ("(qqqs)",
                        (guint16)rec->Data.SRV.wPriority,
                        (guint16)rec->Data.SRV.wWeight,
                        (guint16)rec->Data.SRV.wPort,
                        rec->Data.SRV.pNameTarget);
}

static GVariant *
parse_dns_soa (DNS_RECORD *rec)
{
  return g_variant_new ("(ssuuuuu)",
                        rec->Data.SOA.pNamePrimaryServer,
                        rec->Data.SOA.pNameAdministrator,
                        (guint32)rec->Data.SOA.dwSerialNo,
                        (guint32)rec->Data.SOA.dwRefresh,
                        (guint32)rec->Data.SOA.dwRetry,
                        (guint32)rec->Data.SOA.dwExpire,
                        (guint32)rec->Data.SOA.dwDefaultTtl);
}

static GVariant *
parse_dns_ns (DNS_RECORD *rec)
{
  return g_variant_new ("(s)", rec->Data.NS.pNameHost);
}

static GVariant *
parse_dns_mx (DNS_RECORD *rec)
{
  return g_variant_new ("(qs)",
                        (guint16)rec->Data.MX.wPreference,
                        rec->Data.MX.pNameExchange);
}

static GVariant *
parse_dns_txt (DNS_RECORD *rec)
{
  GVariant *record;
  GPtrArray *array;
  DWORD i;

  array = g_ptr_array_new ();
  for (i = 0; i < rec->Data.TXT.dwStringCount; i++)
    g_ptr_array_add (array, rec->Data.TXT.pStringArray[i]);
  record = g_variant_new ("(@as)",
                          g_variant_new_strv ((const gchar **)array->pdata, array->len));
  g_ptr_array_free (array, TRUE);
  return record;
}

static WORD
g_resolver_record_type_to_dnstype (GResolverRecordType type)
{
  switch (type)
  {
    case G_RESOLVER_RECORD_SRV:
      return DNS_TYPE_SRV;
    case G_RESOLVER_RECORD_TXT:
      return DNS_TYPE_TEXT;
    case G_RESOLVER_RECORD_SOA:
      return DNS_TYPE_SOA;
    case G_RESOLVER_RECORD_NS:
      return DNS_TYPE_NS;
    case G_RESOLVER_RECORD_MX:
      return DNS_TYPE_MX;
  }
  g_return_val_if_reached (-1);
}

static GList *
g_resolver_records_from_DnsQuery (const gchar  *rrname,
                                  WORD          dnstype,
                                  DNS_STATUS    status,
                                  DNS_RECORD   *results,
                                  GError      **error)
{
  DNS_RECORD *rec;
  gpointer record;
  GList *records;

  if (status != ERROR_SUCCESS)
    {
      if (status == DNS_ERROR_RCODE_NAME_ERROR)
        {
727
          g_set_error (error, G_RESOLVER_ERROR, G_RESOLVER_ERROR_NOT_FOUND,
728
                       _("No DNS record of the requested type for “%s”"), rrname);
729 730 731
        }
      else if (status == DNS_ERROR_RCODE_SERVER_FAILURE)
        {
732
          g_set_error (error, G_RESOLVER_ERROR, G_RESOLVER_ERROR_TEMPORARY_FAILURE,
733
                       _("Temporarily unable to resolve “%s”"), rrname);
734 735 736
        }
      else
        {
737
          g_set_error (error, G_RESOLVER_ERROR, G_RESOLVER_ERROR_INTERNAL,
738
                       _("Error resolving “%s”"), rrname);
739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774
        }

      return NULL;
    }

  records = NULL;
  for (rec = results; rec; rec = rec->pNext)
    {
      if (rec->wType != dnstype)
        continue;
      switch (dnstype)
        {
        case DNS_TYPE_SRV:
          record = parse_dns_srv (rec);
          break;
        case DNS_TYPE_SOA:
          record = parse_dns_soa (rec);
          break;
        case DNS_TYPE_NS:
          record = parse_dns_ns (rec);
          break;
        case DNS_TYPE_MX:
          record = parse_dns_mx (rec);
          break;
        case DNS_TYPE_TEXT:
          record = parse_dns_txt (rec);
          break;
        default:
          g_warn_if_reached ();
          record = NULL;
          break;
        }
      if (record != NULL)
        records = g_list_prepend (records, g_variant_ref_sink (record));
    }

775 776 777
  if (records == NULL)
    {
      g_set_error (error, G_RESOLVER_ERROR, G_RESOLVER_ERROR_NOT_FOUND,
778
                   _("No DNS record of the requested type for “%s”"), rrname);
779 780 781 782 783

      return NULL;
    }
  else
    return records;
784 785 786 787
}

#endif

788 789 790 791 792 793 794 795 796 797 798 799
typedef struct {
  char *rrname;
  GResolverRecordType record_type;
} LookupRecordsData;

static void
free_lookup_records_data (LookupRecordsData *lrd)
{
  g_free (lrd->rrname);
  g_slice_free (LookupRecordsData, lrd);
}

800 801 802 803 804 805
static void
free_records (GList *records)
{
  g_list_free_full (records, (GDestroyNotify) g_variant_unref);
}

806 807 808 809 810 811 812
#if defined(G_OS_UNIX)
#ifdef __BIONIC__
#define C_IN 1
int res_query(const char *, int, int, u_char *, int);
#endif
#endif

813
static void
814 815 816 817
do_lookup_records (GTask         *task,
                   gpointer       source_object,
                   gpointer       task_data,
                   GCancellable  *cancellable)
818
{
819
  LookupRecordsData *lrd = task_data;
820
  GList *records;
821
  GError *error = NULL;
822

823
#if defined(G_OS_UNIX)
824 825 826 827 828
  gint len = 512;
  gint herr;
  GByteArray *answer;
  gint rrtype;

829
  rrtype = g_resolver_record_type_to_rrtype (lrd->record_type);
830 831 832 833
  answer = g_byte_array_new ();
  for (;;)
    {
      g_byte_array_set_size (answer, len * 2);
834
      len = res_query (lrd->rrname, C_IN, rrtype, answer->data, answer->len);
835 836 837 838 839 840 841 842 843

      /* If answer fit in the buffer then we're done */
      if (len < 0 || len < (gint)answer->len)
        break;

      /*
       * On overflow some res_query's return the length needed, others
       * return the full length entered. This code works in either case.
       */
844
    }
845 846

  herr = h_errno;
847
  records = g_resolver_records_from_res_query (lrd->rrname, rrtype, answer->data, len, herr, &error);
848 849
  g_byte_array_free (answer, TRUE);

850 851
#else

852 853 854 855
  DNS_STATUS status;
  DNS_RECORD *results = NULL;
  WORD dnstype;

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);
859 860
  if (results != NULL)
    DnsRecordListFree (results, DnsFreeRecordList);
861

862
#endif
863

864
  if (records)
865
    g_task_return_pointer (task, records, (GDestroyNotify) free_records);
866 867
  else
    g_task_return_error (task, error);
868 869 870
}

static GList *
871 872
lookup_records (GResolver              *resolver,
                const gchar            *rrname,
873 874 875
                GResolverRecordType     record_type,
                GCancellable           *cancellable,
                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);
883 884 885 886 887 888 889 890

  lrd = g_slice_new (LookupRecordsData);
  lrd->rrname = g_strdup (rrname);
  lrd->record_type = record_type;
  g_task_set_task_data (task, lrd, (GDestroyNotify) free_lookup_records_data);

  g_task_set_return_on_cancel (task, TRUE);
  g_task_run_in_thread_sync (task, do_lookup_records);
891
  records = g_task_propagate_pointer (task, error);
892 893
  g_object_unref (task);

894
  return records;
895 896 897
}

static void
898
lookup_records_async (GResolver           *resolver,
899
                      const char          *rrname,
900 901
                      GResolverRecordType  record_type,
                      GCancellable        *cancellable,
902
                      GAsyncReadyCallback  callback,
903
                      gpointer             user_data)
904
{
905 906 907 908
  GTask *task;
  LookupRecordsData *lrd;

  task = g_task_new (resolver, cancellable, callback, user_data);
909
  g_task_set_source_tag (task, lookup_records_async);
910 911 912 913 914 915 916 917 918

  lrd = g_slice_new (LookupRecordsData);
  lrd->rrname = g_strdup (rrname);
  lrd->record_type = record_type;
  g_task_set_task_data (task, lrd, (GDestroyNotify) free_lookup_records_data);

  g_task_set_return_on_cancel (task, TRUE);
  g_task_run_in_thread (task, do_lookup_records);
  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);
929 930 931 932 933 934 935 936 937 938 939 940 941 942
}


static void
g_threaded_resolver_class_init (GThreadedResolverClass *threaded_class)
{
  GResolverClass *resolver_class = G_RESOLVER_CLASS (threaded_class);

  resolver_class->lookup_by_name           = lookup_by_name;
  resolver_class->lookup_by_name_async     = lookup_by_name_async;
  resolver_class->lookup_by_name_finish    = lookup_by_name_finish;
  resolver_class->lookup_by_address        = lookup_by_address;
  resolver_class->lookup_by_address_async  = lookup_by_address_async;
  resolver_class->lookup_by_address_finish = lookup_by_address_finish;
943 944 945
  resolver_class->lookup_records           = lookup_records;
  resolver_class->lookup_records_async     = lookup_records_async;
  resolver_class->lookup_records_finish    = lookup_records_finish;
946

947
  /* Initialize addrinfo_hints */
948 949 950 951 952 953 954 955 956
#ifdef AI_ADDRCONFIG
  addrinfo_hints.ai_flags |= AI_ADDRCONFIG;
#endif
  /* These two don't actually matter, they just get copied into the
   * returned addrinfo structures (and then we ignore them). But if
   * we leave them unset, we'll get back duplicate answers.
   */
  addrinfo_hints.ai_socktype = SOCK_STREAM;
  addrinfo_hints.ai_protocol = IPPROTO_TCP;
957
}