dlls/dnsapi/query.c

   1 /*
   2  * DNS support
   3  *
   4  * Copyright (C) 2006 Hans Leidekker
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 #include "config.h"
  22 #include "wine/port.h"
  23 #include "wine/debug.h"
  24
  25 #include <stdarg.h>
  26 #include <string.h>
  27 #include <sys/types.h>
  28
  29 #ifdef HAVE_NETINET_IN_H
  30 # include <netinet/in.h>
  31 #endif
  32 #ifdef HAVE_ARPA_NAMESER_H
  33 # include <arpa/nameser.h>
  34 #endif
  35 #ifdef HAVE_RESOLV_H
  36 # include <resolv.h>
  37 #endif
  38 #ifdef HAVE_NETDB_H
  39 # include <netdb.h>
  40 #endif
  41
  42 #include "windef.h"
  43 #include "winbase.h"
  44 #include "winerror.h"
  45 #include "winnls.h"
  46 #include "windns.h"
  47 #include "nb30.h"
  48
  49 #include "dnsapi.h"
  50
  51 WINE_DEFAULT_DEBUG_CHANNEL(dnsapi);
  52
  53 #ifdef HAVE_RESOLV
  54
  55 static CRITICAL_SECTION resolver_cs;
  56 static CRITICAL_SECTION_DEBUG resolver_cs_debug =
  57 {
  58     0, 0, &resolver_cs,
  59     { &resolver_cs_debug.ProcessLocksList,
  60       &resolver_cs_debug.ProcessLocksList },
  61       0, 0, { (DWORD_PTR)(__FILE__ ": resolver_cs") }
  62 };
  63 static CRITICAL_SECTION resolver_cs = { &resolver_cs_debug, -1, 0, 0, 0, 0 };
  64
  65 #define LOCK_RESOLVER()     do { EnterCriticalSection( &resolver_cs ); } while (0)
  66 #define UNLOCK_RESOLVER()   do { LeaveCriticalSection( &resolver_cs ); } while (0)
  67
  68
  69 static const char *dns_section_to_str( ns_sect section )
  70 {
  71     switch (section)
  72     {
  73     case ns_s_qd:   return "Question";
  74     case ns_s_an:   return "Answer";
  75     case ns_s_ns:   return "Authority";
  76     case ns_s_ar:   return "Additional";
  77     default:
  78     {
  79         static char tmp[5];
  80         FIXME( "unknown section: 0x%02x\n", section );
  81         sprintf( tmp, "0x%02x", section );
  82         return tmp;
  83     }
  84     }
  85 }
  86
  87 static unsigned long dns_map_options( DWORD options )
  88 {
  89     unsigned long ret = 0;
  90
  91     if (options == DNS_QUERY_STANDARD)
  92         return RES_DEFAULT;
  93
  94     if (options & DNS_QUERY_ACCEPT_TRUNCATED_RESPONSE)
  95         ret |= RES_IGNTC;
  96     if (options & DNS_QUERY_USE_TCP_ONLY)
  97         ret |= RES_USEVC;
  98     if (options & DNS_QUERY_NO_RECURSION)
  99         ret &= ~RES_RECURSE;
 100     if (options & DNS_QUERY_NO_LOCAL_NAME)
 101         ret &= ~RES_DNSRCH;
 102     if (options & DNS_QUERY_NO_HOSTS_FILE)
 103         ret |= RES_NOALIASES;
 104     if (options & DNS_QUERY_TREAT_AS_FQDN)
 105         ret &= ~RES_DEFNAMES;
 106
 107     if (options & DNS_QUERY_DONT_RESET_TTL_VALUES)
 108         FIXME( "option DNS_QUERY_DONT_RESET_TTL_VALUES not implemented\n" );
 109     if (options & DNS_QUERY_RESERVED)
 110         FIXME( "option DNS_QUERY_RESERVED not implemented\n" );
 111     if (options & DNS_QUERY_WIRE_ONLY)
 112         FIXME( "option DNS_QUERY_WIRE_ONLY not implemented\n" );
 113     if (options & DNS_QUERY_NO_WIRE_QUERY)
 114         FIXME( "option DNS_QUERY_NO_WIRE_QUERY not implemented\n" );
 115     if (options & DNS_QUERY_BYPASS_CACHE)
 116         FIXME( "option DNS_QUERY_BYPASS_CACHE not implemented\n" );
 117     if (options & DNS_QUERY_RETURN_MESSAGE)
 118         FIXME( "option DNS_QUERY_RETURN_MESSAGE not implemented\n" );
 119
 120     if (options & DNS_QUERY_NO_NETBT)
 121         TRACE( "netbios query disabled\n" );
 122
 123     return ret;
 124 }
 125
 126 static DNS_STATUS dns_map_error( int error )
 127 {
 128     switch (error)
 129     {
 130     case ns_r_noerror:  return ERROR_SUCCESS;
 131     case ns_r_formerr:  return DNS_ERROR_RCODE_FORMAT_ERROR;
 132     case ns_r_servfail: return DNS_ERROR_RCODE_SERVER_FAILURE;
 133     case ns_r_nxdomain: return DNS_ERROR_RCODE_NAME_ERROR;
 134     case ns_r_notimpl:  return DNS_ERROR_RCODE_NOT_IMPLEMENTED;
 135     case ns_r_refused:  return DNS_ERROR_RCODE_REFUSED;
 136     case ns_r_yxdomain: return DNS_ERROR_RCODE_YXDOMAIN;
 137     case ns_r_yxrrset:  return DNS_ERROR_RCODE_YXRRSET;
 138     case ns_r_nxrrset:  return DNS_ERROR_RCODE_NXRRSET;
 139     case ns_r_notauth:  return DNS_ERROR_RCODE_NOTAUTH;
 140     case ns_r_notzone:  return DNS_ERROR_RCODE_NOTZONE;
 141     default:
 142         FIXME( "unmapped error code: %d\n", error );
 143         return DNS_ERROR_RCODE_NOT_IMPLEMENTED;
 144     }
 145 }
 146
 147 static DNS_STATUS dns_map_h_errno( int error )
 148 {
 149     switch (error)
 150     {
 151     case NO_DATA:
 152     case HOST_NOT_FOUND: return DNS_ERROR_RCODE_NAME_ERROR;
 153     case TRY_AGAIN:      return DNS_ERROR_RCODE_SERVER_FAILURE;
 154     case NO_RECOVERY:    return DNS_ERROR_RCODE_REFUSED;
 155     case NETDB_INTERNAL: return DNS_ERROR_RCODE;
 156     default:
 157         FIXME( "unmapped error code: %d\n", error );
 158         return DNS_ERROR_RCODE_NOT_IMPLEMENTED;
 159     }
 160 }
 161
 162 static char *dns_dname_from_msg( ns_msg msg, const unsigned char *pos )
 163 {
 164     int len;
 165     char *str, dname[NS_MAXDNAME] = ".";
 166
 167     /* returns *compressed* length, ignore it */
 168     len = dns_ns_name_uncompress( ns_msg_base( msg ), ns_msg_end( msg ),
 169                                   pos, dname, sizeof(dname) );
 170
 171     len = strlen( dname );
 172     str = dns_alloc( len + 1 );
 173     if (str) strcpy( str, dname );
 174     return str;
 175 }
 176
 177 static char *dns_str_from_rdata( const unsigned char *rdata )
 178 {
 179     char *str;
 180     unsigned int len = rdata[0];
 181
 182     str = dns_alloc( len + 1 );
 183     if (str)
 184     {
 185         memcpy( str, ++rdata, len );
 186         str[len] = '\0';
 187     }
 188     return str;
 189 }
 190
 191 static unsigned int dns_get_record_size( ns_rr *rr )
 192 {
 193     const unsigned char *pos = rr->rdata;
 194     unsigned int num = 0, size = sizeof(DNS_RECORDA);
 195
 196     switch (rr->type)
 197     {
 198     case ns_t_key:
 199     {
 200         pos += sizeof(WORD) + sizeof(BYTE) + sizeof(BYTE);
 201         size += rr->rdata + rr->rdlength - pos - 1;
 202         break;
 203     }
 204     case ns_t_sig:
 205     {
 206         pos += sizeof(PCHAR) + sizeof(WORD) + 2 * sizeof(BYTE);
 207         pos += 3 * sizeof(DWORD) + 2 * sizeof(WORD);
 208         size += rr->rdata + rr->rdlength - pos - 1;
 209         break;
 210     }
 211     case ns_t_hinfo:
 212     case ns_t_isdn:
 213     case ns_t_txt:
 214     case ns_t_x25:
 215     {
 216         while (pos[0] && pos < rr->rdata + rr->rdlength)
 217         {
 218             num++;
 219             pos += pos[0] + 1;
 220         }
 221         size += (num - 1) * sizeof(PCHAR);
 222         break;
 223     }
 224     case ns_t_null:
 225     {
 226         size += rr->rdlength - 1;
 227         break;
 228     }
 229     case ns_t_nxt:
 230     case ns_t_wks:
 231     case 0xff01:  /* WINS */
 232     {
 233         FIXME( "unhandled type: %s\n", dns_type_to_str( rr->type ) );
 234         break;
 235     }
 236     default:
 237         break;
 238     }
 239     return size;
 240 }
 241
 242 static DNS_STATUS dns_copy_rdata( ns_msg msg, ns_rr *rr, DNS_RECORDA *r, WORD *dlen )
 243 {
 244     DNS_STATUS ret = ERROR_SUCCESS;
 245     const unsigned char *pos = rr->rdata;
 246     unsigned int i, size;
 247
 248     switch (rr->type)
 249     {
 250     case ns_t_a:
 251     {
 252         r->Data.A.IpAddress = *(const DWORD *)pos;
 253         *dlen = sizeof(DNS_A_DATA);
 254         break;
 255     }
 256     case ns_t_aaaa:
 257     {
 258         for (i = 0; i < sizeof(IP6_ADDRESS)/sizeof(DWORD); i++)
 259         {
 260             r->Data.AAAA.Ip6Address.IP6Dword[i] = *(const DWORD *)pos;
 261             pos += sizeof(DWORD);
 262         }
 263
 264         *dlen = sizeof(DNS_AAAA_DATA);
 265         break;
 266     }
 267     case ns_t_key:
 268     {
 269         /* FIXME: byte order? */
 270         r->Data.KEY.wFlags      = *(const WORD *)pos;   pos += sizeof(WORD);
 271         r->Data.KEY.chProtocol  = *(const BYTE *)pos++;
 272         r->Data.KEY.chAlgorithm = *(const BYTE *)pos++;
 273
 274         size = rr->rdata + rr->rdlength - pos;
 275
 276         for (i = 0; i < size; i++)
 277             r->Data.KEY.Key[i] = *(const BYTE *)pos++;
 278
 279         *dlen = sizeof(DNS_KEY_DATA) + (size - 1) * sizeof(BYTE);
 280         break;
 281     }
 282     case ns_t_rp:
 283     case ns_t_minfo:
 284     {
 285         r->Data.MINFO.pNameMailbox = dns_dname_from_msg( msg, pos );
 286         if (!r->Data.MINFO.pNameMailbox) return ERROR_NOT_ENOUGH_MEMORY;
 287
 288         if (dns_ns_name_skip( &pos, ns_msg_end( msg ) ) < 0)
 289             return DNS_ERROR_BAD_PACKET;
 290
 291         r->Data.MINFO.pNameErrorsMailbox = dns_dname_from_msg( msg, pos );
 292         if (!r->Data.MINFO.pNameErrorsMailbox)
 293         {
 294             dns_free( r->Data.MINFO.pNameMailbox );
 295             return ERROR_NOT_ENOUGH_MEMORY;
 296         }
 297
 298         *dlen = sizeof(DNS_MINFO_DATAA);
 299         break;
 300     }
 301     case ns_t_afsdb:
 302     case ns_t_rt:
 303     case ns_t_mx:
 304     {
 305         r->Data.MX.wPreference = ntohs( *(const WORD *)pos );
 306         r->Data.MX.pNameExchange = dns_dname_from_msg( msg, pos + sizeof(WORD) );
 307         if (!r->Data.MX.pNameExchange) return ERROR_NOT_ENOUGH_MEMORY;
 308
 309         *dlen = sizeof(DNS_MX_DATAA);
 310         break;
 311     }
 312     case ns_t_null:
 313     {
 314         r->Data.Null.dwByteCount = rr->rdlength;
 315         memcpy( r->Data.Null.Data, rr->rdata, rr->rdlength );
 316
 317         *dlen = sizeof(DNS_NULL_DATA) + rr->rdlength - 1;
 318         break;
 319     }
 320     case ns_t_cname:
 321     case ns_t_ns:
 322     case ns_t_mb:
 323     case ns_t_md:
 324     case ns_t_mf:
 325     case ns_t_mg:
 326     case ns_t_mr:
 327     case ns_t_ptr:
 328     {
 329         r->Data.PTR.pNameHost = dns_dname_from_msg( msg, pos );
 330         if (!r->Data.PTR.pNameHost) return ERROR_NOT_ENOUGH_MEMORY;
 331
 332         *dlen = sizeof(DNS_PTR_DATAA);
 333         break;
 334     }
 335     case ns_t_sig:
 336     {
 337         r->Data.SIG.pNameSigner = dns_dname_from_msg( msg, pos );
 338         if (!r->Data.SIG.pNameSigner) return ERROR_NOT_ENOUGH_MEMORY;
 339
 340         if (dns_ns_name_skip( &pos, ns_msg_end( msg ) ) < 0)
 341             return DNS_ERROR_BAD_PACKET;
 342
 343         /* FIXME: byte order? */
 344         r->Data.SIG.wTypeCovered  = *(const WORD *)pos;   pos += sizeof(WORD);
 345         r->Data.SIG.chAlgorithm   = *(const BYTE *)pos++;
 346         r->Data.SIG.chLabelCount  = *(const BYTE *)pos++;
 347         r->Data.SIG.dwOriginalTtl = *(const DWORD *)pos;  pos += sizeof(DWORD);
 348         r->Data.SIG.dwExpiration  = *(const DWORD *)pos;  pos += sizeof(DWORD);
 349         r->Data.SIG.dwTimeSigned  = *(const DWORD *)pos;  pos += sizeof(DWORD);
 350         r->Data.SIG.wKeyTag       = *(const WORD *)pos;
 351
 352         size = rr->rdata + rr->rdlength - pos;
 353
 354         for (i = 0; i < size; i++)
 355             r->Data.SIG.Signature[i] = *(const BYTE *)pos++;
 356
 357         *dlen = sizeof(DNS_SIG_DATAA) + (size - 1) * sizeof(BYTE);
 358         break;
 359     }
 360     case ns_t_soa:
 361     {
 362         r->Data.SOA.pNamePrimaryServer = dns_dname_from_msg( msg, pos );
 363         if (!r->Data.SOA.pNamePrimaryServer) return ERROR_NOT_ENOUGH_MEMORY;
 364
 365         if (dns_ns_name_skip( &pos, ns_msg_end( msg ) ) < 0)
 366             return DNS_ERROR_BAD_PACKET;
 367
 368         r->Data.SOA.pNameAdministrator = dns_dname_from_msg( msg, pos );
 369         if (!r->Data.SOA.pNameAdministrator)
 370         {
 371             dns_free( r->Data.SOA.pNamePrimaryServer );
 372             return ERROR_NOT_ENOUGH_MEMORY;
 373         }
 374
 375         if (dns_ns_name_skip( &pos, ns_msg_end( msg ) ) < 0)
 376             return DNS_ERROR_BAD_PACKET;
 377
 378         r->Data.SOA.dwSerialNo   = ntohl( *(const DWORD *)pos ); pos += sizeof(DWORD);
 379         r->Data.SOA.dwRefresh    = ntohl( *(const DWORD *)pos ); pos += sizeof(DWORD);
 380         r->Data.SOA.dwRetry      = ntohl( *(const DWORD *)pos ); pos += sizeof(DWORD);
 381         r->Data.SOA.dwExpire     = ntohl( *(const DWORD *)pos ); pos += sizeof(DWORD);
 382         r->Data.SOA.dwDefaultTtl = ntohl( *(const DWORD *)pos ); pos += sizeof(DWORD);
 383
 384         *dlen = sizeof(DNS_SOA_DATAA);
 385         break;
 386     }
 387     case ns_t_srv:
 388     {
 389         r->Data.SRV.wPriority = ntohs( *(const WORD *)pos ); pos += sizeof(WORD);
 390         r->Data.SRV.wWeight   = ntohs( *(const WORD *)pos ); pos += sizeof(WORD);
 391         r->Data.SRV.wPort     = ntohs( *(const WORD *)pos ); pos += sizeof(WORD);
 392
 393         r->Data.SRV.pNameTarget = dns_dname_from_msg( msg, pos );
 394         if (!r->Data.SRV.pNameTarget) return ERROR_NOT_ENOUGH_MEMORY;
 395
 396         *dlen = sizeof(DNS_SRV_DATAA);
 397         break;
 398     }
 399     case ns_t_hinfo:
 400     case ns_t_isdn:
 401     case ns_t_x25:
 402     case ns_t_txt:
 403     {
 404         i = 0;
 405         while (pos[0] && pos < rr->rdata + rr->rdlength)
 406         {
 407             r->Data.TXT.pStringArray[i] = dns_str_from_rdata( pos );
 408             if (!r->Data.TXT.pStringArray[i])
 409             {
 410                 for (--i; i >= 0; i--)
 411                     dns_free( r->Data.TXT.pStringArray[i] );
 412                 return ERROR_NOT_ENOUGH_MEMORY;
 413             }
 414             i++;
 415             pos += pos[0] + 1;
 416         }
 417         r->Data.TXT.dwStringCount = i;
 418         *dlen = sizeof(DNS_TXT_DATAA) + (i - 1) * sizeof(PCHAR);
 419         break;
 420     }
 421     case ns_t_atma:
 422     case ns_t_loc:
 423     case ns_t_nxt:
 424     case ns_t_tsig:
 425     case ns_t_wks:
 426     case 0x00f9:  /* TKEY */
 427     case 0xff01:  /* WINS */
 428     case 0xff02:  /* WINSR */
 429     default:
 430         FIXME( "unhandled type: %s\n", dns_type_to_str( rr->type ) );
 431         return DNS_ERROR_RCODE_NOT_IMPLEMENTED;
 432     }
 433
 434     return ret;
 435 }
 436
 437 static DNS_STATUS dns_copy_record( ns_msg msg, ns_sect section,
 438                                    unsigned short num, DNS_RECORDA **recp )
 439 {
 440     DNS_STATUS ret;
 441     DNS_RECORDA *record;
 442     WORD dlen;
 443     ns_rr rr;
 444
 445     if (dns_ns_parserr( &msg, section, num, &rr ) < 0)
 446         return DNS_ERROR_BAD_PACKET;
 447
 448     if (!(record = dns_zero_alloc( dns_get_record_size( &rr ) )))
 449         return ERROR_NOT_ENOUGH_MEMORY;
 450
 451     record->pName = dns_strdup_u( rr.name );
 452     if (!record->pName)
 453     {
 454         dns_free( record );
 455         return ERROR_NOT_ENOUGH_MEMORY;
 456     }
 457
 458     record->wType = rr.type;
 459     record->Flags.S.Section = section;
 460     record->Flags.S.CharSet = DnsCharSetUtf8;
 461     record->dwTtl = rr.ttl;
 462
 463     if ((ret = dns_copy_rdata( msg, &rr, record, &dlen )))
 464     {
 465         dns_free( record->pName );
 466         dns_free( record );
 467         return ret;
 468     }
 469     record->wDataLength = dlen;
 470     *recp = record;
 471
 472     TRACE( "found %s record in %s section\n",
 473            dns_type_to_str( rr.type ), dns_section_to_str( section ) );
 474     return ERROR_SUCCESS;
 475 }
 476
 477 #define DEFAULT_TTL  1200
 478
 479 static DNS_STATUS dns_do_query_netbios( PCSTR name, DNS_RECORDA **recp )
 480 {
 481     NCB ncb;
 482     UCHAR ret;
 483     DNS_RRSET rrset;
 484     FIND_NAME_BUFFER *buffer;
 485     FIND_NAME_HEADER *header;
 486     DNS_RECORDA *record = NULL;
 487     unsigned int i, len;
 488     DNS_STATUS status = ERROR_INVALID_NAME;
 489
 490     len = strlen( name );
 491     if (len >= NCBNAMSZ) return DNS_ERROR_RCODE_NAME_ERROR;
 492
 493     DNS_RRSET_INIT( rrset );
 494
 495     memset( &ncb, 0, sizeof(ncb) );
 496     ncb.ncb_command = NCBFINDNAME;
 497
 498     memset( ncb.ncb_callname, ' ', sizeof(ncb.ncb_callname) );
 499     memcpy( ncb.ncb_callname, name, len );
 500     ncb.ncb_callname[NCBNAMSZ - 1] = '\0';
 501
 502     ret = Netbios( &ncb );
 503     if (ret != NRC_GOODRET) return ERROR_INVALID_NAME;
 504
 505     header = (FIND_NAME_HEADER *)ncb.ncb_buffer;
 506     buffer = (FIND_NAME_BUFFER *)((char *)header + sizeof(FIND_NAME_HEADER));
 507
 508     for (i = 0; i < header->node_count; i++)
 509     {
 510         record = dns_zero_alloc( sizeof(DNS_RECORDA) );
 511         if (!record)
 512         {
 513             status = ERROR_NOT_ENOUGH_MEMORY;
 514             goto exit;
 515         }
 516         else
 517         {
 518             record->pName = dns_strdup_u( name );
 519             if (!record->pName)
 520             {
 521                 status = ERROR_NOT_ENOUGH_MEMORY;
 522                 goto exit;
 523             }
 524
 525             record->wType = DNS_TYPE_A;
 526             record->Flags.S.Section = DnsSectionAnswer;
 527             record->Flags.S.CharSet = DnsCharSetUtf8;
 528             record->dwTtl = DEFAULT_TTL;
 529
 530             /* FIXME: network byte order? */
 531             record->Data.A.IpAddress = *(DWORD *)((char *)buffer[i].destination_addr + 2);
 532
 533             DNS_RRSET_ADD( rrset, (DNS_RECORD *)record );
 534         }
 535     }
 536     status = ERROR_SUCCESS;
 537
 538 exit:
 539     DNS_RRSET_TERMINATE( rrset );
 540
 541     if (status != ERROR_SUCCESS)
 542         DnsRecordListFree( rrset.pFirstRR, DnsFreeRecordList );
 543     else
 544         *recp = (DNS_RECORDA *)rrset.pFirstRR;
 545
 546     return status;
 547 }
 548
 549 /*  The resolver lock must be held and res_init() must have been
 550  *  called before calling these three functions.
 551  */
 552 static DNS_STATUS dns_set_serverlist( PIP4_ARRAY addrs )
 553 {
 554     unsigned int i;
 555
 556     if (addrs->AddrCount > MAXNS)
 557     {
 558         WARN( "too many servers: %d only using the first: %d\n",
 559               addrs->AddrCount, MAXNS );
 560         _res.nscount = MAXNS;
 561     }
 562     else _res.nscount = addrs->AddrCount;
 563
 564     for (i = 0; i < _res.nscount; i++)
 565         _res.nsaddr_list[i].sin_addr.s_addr = addrs->AddrArray[i];
 566
 567     return ERROR_SUCCESS;
 568 }
 569
 570 static DNS_STATUS dns_get_serverlist( PIP4_ARRAY addrs, PDWORD len )
 571 {
 572     unsigned int i, size;
 573
 574     size = sizeof(IP4_ARRAY) + sizeof(IP4_ADDRESS) * (_res.nscount - 1);
 575     if (!addrs || *len < size)
 576     {
 577         *len = size;
 578         return ERROR_INSUFFICIENT_BUFFER;
 579     }
 580
 581     addrs->AddrCount = _res.nscount;
 582
 583     for (i = 0; i < _res.nscount; i++)
 584         addrs->AddrArray[i] = _res.nsaddr_list[i].sin_addr.s_addr;
 585
 586     return ERROR_SUCCESS;
 587 }
 588
 589 static DNS_STATUS dns_do_query( PCSTR name, WORD type, DWORD options,
 590                                 PDNS_RECORDA *result )
 591 {
 592     DNS_STATUS ret = DNS_ERROR_RCODE_NOT_IMPLEMENTED;
 593
 594     unsigned int i, num;
 595     unsigned char answer[NS_PACKETSZ];
 596     ns_sect sections[] = { ns_s_an, ns_s_ar };
 597     ns_msg msg;
 598
 599     DNS_RECORDA *record = NULL;
 600     DNS_RRSET rrset;
 601     int len;
 602
 603     DNS_RRSET_INIT( rrset );
 604
 605     len = res_query( name, ns_c_in, type, answer, sizeof(answer) );
 606     if (len < 0)
 607     {
 608         ret = dns_map_h_errno( h_errno );
 609         goto exit;
 610     }
 611
 612     if (dns_ns_initparse( answer, len, &msg ) < 0)
 613     {
 614         ret = DNS_ERROR_BAD_PACKET;
 615         goto exit;
 616     }
 617
 618 #define RCODE_MASK 0x0f
 619     if ((msg._flags & RCODE_MASK) != ns_r_noerror)
 620     {
 621         ret = dns_map_error( msg._flags & RCODE_MASK );
 622         goto exit;
 623     }
 624
 625     for (i = 0; i < sizeof(sections)/sizeof(sections[0]); i++)
 626     {
 627         for (num = 0; num < ns_msg_count( msg, sections[i] ); num++)
 628         {
 629             ret = dns_copy_record( msg, sections[i], num, &record );
 630             if (ret != ERROR_SUCCESS) goto exit;
 631
 632             DNS_RRSET_ADD( rrset, (DNS_RECORD *)record );
 633         }
 634     }
 635
 636 exit:
 637     DNS_RRSET_TERMINATE( rrset );
 638
 639     if (ret != ERROR_SUCCESS)
 640         DnsRecordListFree( rrset.pFirstRR, DnsFreeRecordList );
 641     else
 642         *result = (DNS_RECORDA *)rrset.pFirstRR;
 643
 644     return ret;
 645 }
 646
 647 #endif /* HAVE_RESOLV */
 648
 649 /******************************************************************************
 650  * DnsQuery_A           [DNSAPI.@]
 651  *
 652  */
 653 DNS_STATUS WINAPI DnsQuery_A( PCSTR name, WORD type, DWORD options, PIP4_ARRAY servers,
 654                               PDNS_RECORDA *result, PVOID *reserved )
 655 {
 656     WCHAR *nameW;
 657     DNS_RECORDW *resultW;
 658     DNS_STATUS status;
 659
 660     TRACE( "(%s,%s,0x%08x,%p,%p,%p)\n", debugstr_a(name), dns_type_to_str( type ),
 661            options, servers, result, reserved );
 662
 663     if (!name || !result)
 664         return ERROR_INVALID_PARAMETER;
 665
 666     nameW = dns_strdup_aw( name );
 667     if (!nameW) return ERROR_NOT_ENOUGH_MEMORY;
 668
 669     status = DnsQuery_W( nameW, type, options, servers, &resultW, reserved );
 670
 671     if (status == ERROR_SUCCESS)
 672     {
 673         *result = (DNS_RECORDA *)DnsRecordSetCopyEx(
 674              (DNS_RECORD *)resultW, DnsCharSetUnicode, DnsCharSetAnsi );
 675
 676         if (!*result) status = ERROR_NOT_ENOUGH_MEMORY;
 677         DnsRecordListFree( (DNS_RECORD *)resultW, DnsFreeRecordList );
 678     }
 679
 680     dns_free( nameW );
 681     return status;
 682 }
 683
 684 /******************************************************************************
 685  * DnsQuery_UTF8              [DNSAPI.@]
 686  *
 687  */
 688 DNS_STATUS WINAPI DnsQuery_UTF8( PCSTR name, WORD type, DWORD options, PIP4_ARRAY servers,
 689                                  PDNS_RECORDA *result, PVOID *reserved )
 690 {
 691     DNS_STATUS ret = DNS_ERROR_RCODE_NOT_IMPLEMENTED;
 692 #ifdef HAVE_RESOLV
 693
 694     TRACE( "(%s,%s,0x%08x,%p,%p,%p)\n", debugstr_a(name), dns_type_to_str( type ),
 695            options, servers, result, reserved );
 696
 697     if (!name || !result)
 698         return ERROR_INVALID_PARAMETER;
 699
 700     LOCK_RESOLVER();
 701
 702     res_init();
 703     _res.options |= dns_map_options( options );
 704
 705     if (servers && (ret = dns_set_serverlist( servers )))
 706     {
 707         UNLOCK_RESOLVER();
 708         return ret;
 709     }
 710
 711     ret = dns_do_query( name, type, options, result );
 712
 713     if (ret == DNS_ERROR_RCODE_NAME_ERROR && type == DNS_TYPE_A &&
 714         !(options & DNS_QUERY_NO_NETBT))
 715     {
 716         TRACE( "dns lookup failed, trying netbios query\n" );
 717         ret = dns_do_query_netbios( name, result );
 718     }
 719
 720     UNLOCK_RESOLVER();
 721
 722 #endif
 723     return ret;
 724 }
 725
 726 /******************************************************************************
 727  * DnsQuery_W              [DNSAPI.@]
 728  *
 729  */
 730 DNS_STATUS WINAPI DnsQuery_W( PCWSTR name, WORD type, DWORD options, PIP4_ARRAY servers,
 731                               PDNS_RECORDW *result, PVOID *reserved )
 732 {
 733     char *nameU;
 734     DNS_RECORDA *resultA;
 735     DNS_STATUS status;
 736
 737     TRACE( "(%s,%s,0x%08x,%p,%p,%p)\n", debugstr_w(name), dns_type_to_str( type ),
 738            options, servers, result, reserved );
 739
 740     if (!name || !result)
 741         return ERROR_INVALID_PARAMETER;
 742
 743     nameU = dns_strdup_wu( name );
 744     if (!nameU) return ERROR_NOT_ENOUGH_MEMORY;
 745
 746     status = DnsQuery_UTF8( nameU, type, options, servers, &resultA, reserved );
 747
 748     if (status == ERROR_SUCCESS)
 749     {
 750         *result = (DNS_RECORDW *)DnsRecordSetCopyEx(
 751             (DNS_RECORD *)resultA, DnsCharSetUtf8, DnsCharSetUnicode );
 752
 753         if (!*result) status = ERROR_NOT_ENOUGH_MEMORY;
 754         DnsRecordListFree( (DNS_RECORD *)resultA, DnsFreeRecordList );
 755     }
 756
 757     dns_free( nameU );
 758     return status;
 759 }
 760
 761 static DNS_STATUS dns_get_hostname_a( COMPUTER_NAME_FORMAT format,
 762                                       LPSTR buffer, PDWORD len )
 763 {
 764     char name[256];
 765     DWORD size = sizeof(name);
 766
 767     if (!GetComputerNameExA( format, name, &size ))
 768         return DNS_ERROR_NAME_DOES_NOT_EXIST;
 769
 770     if (!buffer || (size = lstrlenA( name ) + 1) > *len)
 771     {
 772         *len = size;
 773         return ERROR_INSUFFICIENT_BUFFER;
 774     }
 775
 776     lstrcpyA( buffer, name );
 777     return ERROR_SUCCESS;
 778 }
 779
 780 static DNS_STATUS dns_get_hostname_w( COMPUTER_NAME_FORMAT format,
 781                                       LPWSTR buffer, PDWORD len )
 782 {
 783     WCHAR name[256];
 784     DWORD size = sizeof(name);
 785
 786     if (!GetComputerNameExW( format, name, &size ))
 787         return DNS_ERROR_NAME_DOES_NOT_EXIST;
 788
 789     if (!buffer || (size = lstrlenW( name ) + 1) > *len)
 790     {
 791         *len = size;
 792         return ERROR_INSUFFICIENT_BUFFER;
 793     }
 794
 795     lstrcpyW( buffer, name );
 796     return ERROR_SUCCESS;
 797 }
 798
 799 /******************************************************************************
 800  * DnsQueryConfig          [DNSAPI.@]
 801  *
 802  */
 803 DNS_STATUS WINAPI DnsQueryConfig( DNS_CONFIG_TYPE config, DWORD flag, PWSTR adapter,
 804                                   PVOID reserved, PVOID buffer, PDWORD len )
 805 {
 806     DNS_STATUS ret = ERROR_INVALID_PARAMETER;
 807
 808     TRACE( "(%d,0x%08x,%s,%p,%p,%p)\n", config, flag, debugstr_w(adapter),
 809            reserved, buffer, len );
 810
 811     if (!len) return ERROR_INVALID_PARAMETER;
 812
 813     switch (config)
 814     {
 815     case DnsConfigDnsServerList:
 816     {
 817 #ifdef HAVE_RESOLV
 818         LOCK_RESOLVER();
 819
 820         res_init();
 821         ret = dns_get_serverlist( buffer, len );
 822
 823         UNLOCK_RESOLVER();
 824         break;
 825 #else
 826         WARN( "compiled without resolver support\n" );
 827         break;
 828 #endif
 829     }
 830     case DnsConfigHostName_A:
 831     case DnsConfigHostName_UTF8:
 832         return dns_get_hostname_a( ComputerNameDnsHostname, buffer, len );
 833
 834     case DnsConfigFullHostName_A:
 835     case DnsConfigFullHostName_UTF8:
 836         return dns_get_hostname_a( ComputerNameDnsFullyQualified, buffer, len );
 837
 838     case DnsConfigPrimaryDomainName_A:
 839     case DnsConfigPrimaryDomainName_UTF8:
 840         return dns_get_hostname_a( ComputerNameDnsDomain, buffer, len );
 841
 842     case DnsConfigHostName_W:
 843         return dns_get_hostname_w( ComputerNameDnsHostname, buffer, len );
 844
 845     case DnsConfigFullHostName_W:
 846         return dns_get_hostname_w( ComputerNameDnsFullyQualified, buffer, len );
 847
 848     case DnsConfigPrimaryDomainName_W:
 849         return dns_get_hostname_w( ComputerNameDnsDomain, buffer, len );
 850
 851     case DnsConfigAdapterDomainName_A:
 852     case DnsConfigAdapterDomainName_W:
 853     case DnsConfigAdapterDomainName_UTF8:
 854     case DnsConfigSearchList:
 855     case DnsConfigAdapterInfo:
 856     case DnsConfigPrimaryHostNameRegistrationEnabled:
 857     case DnsConfigAdapterHostNameRegistrationEnabled:
 858     case DnsConfigAddressRegistrationMaxCount:
 859         FIXME( "unimplemented config type %d\n", config );
 860         break;
 861
 862     default:
 863         WARN( "unknown config type: %d\n", config );
 864         break;
 865     }
 866     return ret;
 867 }