dlls/dnsapi/libresolv.c

   1 /*
   2  * Unix interface for libresolv
   3  *
   4  * Copyright 2021 Hans Leidekker for CodeWeavers
   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 #if 0
  22 #pragma makedep unix
  23 #endif
  24
  25 #include "config.h"
  26
  27 #ifdef HAVE_RESOLV
  28 #include <stdarg.h>
  29 #include <string.h>
  30 #include <stdio.h>
  31 #include <stdlib.h>
  32 #include <sys/types.h>
  33
  34 #ifdef HAVE_NETINET_IN_H
  35 # include <netinet/in.h>
  36 #endif
  37 #ifdef HAVE_ARPA_NAMESER_H
  38 # include <arpa/nameser.h>
  39 #endif
  40 #ifdef HAVE_RESOLV_H
  41 # include <resolv.h>
  42 #endif
  43 #ifdef HAVE_NETDB_H
  44 # include <netdb.h>
  45 #endif
  46
  47 #include "ntstatus.h"
  48 #define WIN32_NO_STATUS
  49 #include "windef.h"
  50 #include "winternl.h"
  51 #include "winbase.h"
  52 #include "windns.h"
  53 #define USE_WS_PREFIX
  54 #include "ws2def.h"
  55 #include "ws2ipdef.h"
  56
  57 #include "wine/debug.h"
  58 #include "dnsapi.h"
  59
  60 WINE_DEFAULT_DEBUG_CHANNEL(dnsapi);
  61
  62 /* call res_init() just once because of a bug in Mac OS X 10.4 */
  63 /* call once per thread on systems that have per-thread _res */
  64 static void init_resolver( void )
  65 {
  66     if (!(_res.options & RES_INIT)) res_init();
  67 }
  68
  69 static unsigned long map_options( DWORD options )
  70 {
  71     unsigned long ret = 0;
  72
  73     if (options == DNS_QUERY_STANDARD)
  74         return RES_DEFAULT;
  75
  76     if (options & DNS_QUERY_ACCEPT_TRUNCATED_RESPONSE)
  77         ret |= RES_IGNTC;
  78     if (options & DNS_QUERY_USE_TCP_ONLY)
  79         ret |= RES_USEVC;
  80     if (options & DNS_QUERY_NO_RECURSION)
  81         ret &= ~RES_RECURSE;
  82     if (options & DNS_QUERY_NO_LOCAL_NAME)
  83         ret &= ~RES_DNSRCH;
  84     if (options & DNS_QUERY_NO_HOSTS_FILE)
  85         ret |= RES_NOALIASES;
  86     if (options & DNS_QUERY_TREAT_AS_FQDN)
  87         ret &= ~RES_DEFNAMES;
  88
  89     if (options & DNS_QUERY_DONT_RESET_TTL_VALUES)
  90         FIXME( "option DNS_QUERY_DONT_RESET_TTL_VALUES not implemented\n" );
  91     if (options & DNS_QUERY_RESERVED)
  92         FIXME( "option DNS_QUERY_RESERVED not implemented\n" );
  93     if (options & DNS_QUERY_WIRE_ONLY)
  94         FIXME( "option DNS_QUERY_WIRE_ONLY not implemented\n" );
  95     if (options & DNS_QUERY_NO_WIRE_QUERY)
  96         FIXME( "option DNS_QUERY_NO_WIRE_QUERY not implemented\n" );
  97     if (options & DNS_QUERY_BYPASS_CACHE)
  98         FIXME( "option DNS_QUERY_BYPASS_CACHE not implemented\n" );
  99     if (options & DNS_QUERY_RETURN_MESSAGE)
 100         FIXME( "option DNS_QUERY_RETURN_MESSAGE not implemented\n" );
 101
 102     if (options & DNS_QUERY_NO_NETBT)
 103         TRACE( "netbios query disabled\n" );
 104
 105     return ret;
 106 }
 107
 108 static DNS_STATUS map_h_errno( int error )
 109 {
 110     switch (error)
 111     {
 112     case NO_DATA:
 113     case HOST_NOT_FOUND: return DNS_ERROR_RCODE_NAME_ERROR;
 114     case TRY_AGAIN:      return DNS_ERROR_RCODE_SERVER_FAILURE;
 115     case NO_RECOVERY:    return DNS_ERROR_RCODE_REFUSED;
 116 #ifdef NETDB_INTERNAL
 117     case NETDB_INTERNAL: return DNS_ERROR_RCODE;
 118 #endif
 119     default:
 120         FIXME( "unmapped error code: %d\n", error );
 121         return DNS_ERROR_RCODE_NOT_IMPLEMENTED;
 122     }
 123 }
 124
 125 static NTSTATUS resolv_get_searchlist( void *args )
 126 {
 127     const struct get_searchlist_params *params = args;
 128     WCHAR *list = params->list;
 129     DWORD i, needed = 0;
 130     WCHAR *ptr, *end;
 131
 132     init_resolver();
 133
 134     for (i = 0; i < MAXDNSRCH + 1 && _res.dnsrch[i]; i++)
 135         needed += (strlen(_res.dnsrch[i]) + 1) * sizeof(WCHAR);
 136     needed += sizeof(WCHAR); /* null terminator */
 137
 138     if (!list || *params->len < needed)
 139     {
 140         *params->len = needed;
 141         return !list ? ERROR_SUCCESS : ERROR_MORE_DATA;
 142     }
 143
 144     *params->len = needed;
 145
 146     ptr = list;
 147     end = ptr + needed / sizeof(WCHAR);
 148     for (i = 0; i < MAXDNSRCH + 1 && _res.dnsrch[i]; i++)
 149         ptr += ntdll_umbstowcs( _res.dnsrch[i], strlen(_res.dnsrch[i]) + 1, ptr, end - ptr );
 150     *ptr = 0; /* null terminator */
 151     return ERROR_SUCCESS;
 152 }
 153
 154
 155 static inline int filter( unsigned short sin_family, USHORT family )
 156 {
 157     if (sin_family != AF_INET && sin_family != AF_INET6) return TRUE;
 158     if (sin_family == AF_INET6 && family == WS_AF_INET) return TRUE;
 159     if (sin_family == AF_INET && family == WS_AF_INET6) return TRUE;
 160
 161     return FALSE;
 162 }
 163
 164 #ifdef HAVE_RES_GETSERVERS
 165
 166 static NTSTATUS resolv_get_serverlist( void *args )
 167 {
 168     const struct get_serverlist_params *params = args;
 169     DNS_ADDR_ARRAY *addrs = params->addrs;
 170     struct __res_state *state = &_res;
 171     DWORD i, found, total, needed;
 172     union res_sockaddr_union *buf;
 173
 174     init_resolver();
 175
 176     total = res_getservers( state, NULL, 0 );
 177     if (!total) return DNS_ERROR_NO_DNS_SERVERS;
 178
 179     if (!addrs && params->family != WS_AF_INET && params->family != WS_AF_INET6)
 180     {
 181         *params->len = FIELD_OFFSET(DNS_ADDR_ARRAY, AddrArray[total]);
 182         return ERROR_SUCCESS;
 183     }
 184
 185     buf = malloc( total * sizeof(union res_sockaddr_union) );
 186     if (!buf) return ERROR_NOT_ENOUGH_MEMORY;
 187
 188     total = res_getservers( state, buf, total );
 189
 190     for (i = 0, found = 0; i < total; i++)
 191     {
 192         if (filter( buf[i].sin.sin_family, params->family )) continue;
 193         found++;
 194     }
 195     if (!found) return DNS_ERROR_NO_DNS_SERVERS;
 196
 197     needed = FIELD_OFFSET(DNS_ADDR_ARRAY, AddrArray[found]);
 198     if (!addrs || *params->len < needed)
 199     {
 200         *params->len = needed;
 201         return !addrs ? ERROR_SUCCESS : ERROR_MORE_DATA;
 202     }
 203     *params->len = needed;
 204     memset( addrs, 0, needed );
 205     addrs->AddrCount = addrs->MaxCount = found;
 206
 207     for (i = 0, found = 0; i < total; i++)
 208     {
 209         if (filter( buf[i].sin.sin_family, params->family )) continue;
 210
 211         if (buf[i].sin6.sin6_family == AF_INET6)
 212         {
 213             SOCKADDR_IN6 *sa = (SOCKADDR_IN6 *)addrs->AddrArray[found].MaxSa;
 214             sa->sin6_family = WS_AF_INET6;
 215             memcpy( &sa->sin6_addr, &buf[i].sin6.sin6_addr, sizeof(sa->sin6_addr) );
 216             addrs->AddrArray[found].Data.DnsAddrUserDword[0] = sizeof(*sa);
 217         }
 218         else
 219         {
 220             SOCKADDR_IN *sa = (SOCKADDR_IN *)addrs->AddrArray[found].MaxSa;
 221             sa->sin_family = WS_AF_INET;
 222             sa->sin_addr.WS_s_addr = buf[i].sin.sin_addr.s_addr;
 223             addrs->AddrArray[found].Data.DnsAddrUserDword[0] = sizeof(*sa);
 224         }
 225         found++;
 226     }
 227
 228     free( buf );
 229     return ERROR_SUCCESS;
 230 }
 231
 232 #else
 233
 234 static NTSTATUS resolv_get_serverlist( void *args )
 235 {
 236     const struct get_serverlist_params *params = args;
 237     DNS_ADDR_ARRAY *addrs = params->addrs;
 238     DWORD needed, found, i;
 239
 240     init_resolver();
 241
 242     if (!_res.nscount) return DNS_ERROR_NO_DNS_SERVERS;
 243     if (!addrs && params->family != WS_AF_INET && params->family != WS_AF_INET6)
 244     {
 245         *params->len = FIELD_OFFSET(DNS_ADDR_ARRAY, AddrArray[_res.nscount]);
 246         return ERROR_SUCCESS;
 247     }
 248
 249     for (i = 0, found = 0; i < _res.nscount; i++)
 250     {
 251         unsigned short sin_family = AF_INET;
 252 #ifdef HAVE_STRUCT___RES_STATE__U__EXT_NSCOUNT6
 253         if (_res._u._ext.nsaddrs[i]) sin_family = _res._u._ext.nsaddrs[i]->sin6_family;
 254 #endif
 255         if (filter( sin_family, params->family )) continue;
 256         found++;
 257     }
 258     if (!found) return DNS_ERROR_NO_DNS_SERVERS;
 259
 260     needed = FIELD_OFFSET(DNS_ADDR_ARRAY, AddrArray[found]);
 261     if (!addrs || *params->len < needed)
 262     {
 263         *params->len = needed;
 264         return !addrs ? ERROR_SUCCESS : ERROR_MORE_DATA;
 265     }
 266     *params->len = needed;
 267     memset( addrs, 0, needed );
 268     addrs->AddrCount = addrs->MaxCount = found;
 269
 270     for (i = 0, found = 0; i < _res.nscount; i++)
 271     {
 272         unsigned short sin_family = AF_INET;
 273 #ifdef HAVE_STRUCT___RES_STATE__U__EXT_NSCOUNT6
 274         if (_res._u._ext.nsaddrs[i]) sin_family = _res._u._ext.nsaddrs[i]->sin6_family;
 275 #endif
 276         if (filter( sin_family, params->family )) continue;
 277
 278 #ifdef HAVE_STRUCT___RES_STATE__U__EXT_NSCOUNT6
 279         if (sin_family == AF_INET6)
 280         {
 281             SOCKADDR_IN6 *sa = (SOCKADDR_IN6 *)addrs->AddrArray[found].MaxSa;
 282             sa->sin6_family = WS_AF_INET6;
 283             memcpy( &sa->sin6_addr, &_res._u._ext.nsaddrs[i]->sin6_addr, sizeof(sa->sin6_addr) );
 284             addrs->AddrArray[found].Data.DnsAddrUserDword[0] = sizeof(*sa);
 285         }
 286         else
 287 #endif
 288         {
 289             SOCKADDR_IN *sa = (SOCKADDR_IN *)addrs->AddrArray[found].MaxSa;
 290             sa->sin_family = WS_AF_INET;
 291             sa->sin_addr.WS_s_addr = _res.nsaddr_list[i].sin_addr.s_addr;
 292             addrs->AddrArray[found].Data.DnsAddrUserDword[0] = sizeof(*sa);
 293         }
 294         found++;
 295     }
 296
 297     return ERROR_SUCCESS;
 298 }
 299 #endif
 300
 301 static NTSTATUS resolv_set_serverlist( void *args )
 302 {
 303     const IP4_ARRAY *addrs = args;
 304     int i;
 305
 306     init_resolver();
 307
 308     if (!addrs || !addrs->AddrCount) return ERROR_SUCCESS;
 309     if (addrs->AddrCount > MAXNS)
 310     {
 311         WARN( "too many servers: %d only using the first: %d\n",
 312               (UINT)addrs->AddrCount, MAXNS );
 313         _res.nscount = MAXNS;
 314     }
 315     else _res.nscount = addrs->AddrCount;
 316
 317     for (i = 0; i < _res.nscount; i++)
 318         _res.nsaddr_list[i].sin_addr.s_addr = addrs->AddrArray[i];
 319
 320     return ERROR_SUCCESS;
 321 }
 322
 323 static NTSTATUS resolv_query( void *args )
 324 {
 325     const struct query_params *params = args;
 326     DNS_STATUS ret = ERROR_SUCCESS;
 327     int len;
 328
 329     init_resolver();
 330     _res.options |= map_options( params->options );
 331
 332     if ((len = res_query( params->name, ns_c_in, params->type, params->buf, *params->len )) < 0)
 333         ret = map_h_errno( h_errno );
 334     else
 335         *params->len = len;
 336     return ret;
 337 }
 338
 339 const unixlib_entry_t __wine_unix_call_funcs[] =
 340 {
 341     resolv_get_searchlist,
 342     resolv_get_serverlist,
 343     resolv_set_serverlist,
 344     resolv_query,
 345 };
 346
 347 C_ASSERT( ARRAYSIZE(__wine_unix_call_funcs) == unix_funcs_count );
 348
 349 #ifdef _WIN64
 350
 351 typedef ULONG PTR32;
 352
 353 static NTSTATUS wow64_resolv_get_searchlist( void *args )
 354 {
 355     struct
 356     {
 357         PTR32  list;
 358         PTR32  len;
 359     } const *params32 = args;
 360
 361     struct get_searchlist_params params =
 362     {
 363         ULongToPtr(params32->list),
 364         ULongToPtr(params32->len)
 365     };
 366
 367     return resolv_get_searchlist( &params );
 368 }
 369
 370 static NTSTATUS wow64_resolv_get_serverlist( void *args )
 371 {
 372     struct
 373     {
 374         USHORT family;
 375         PTR32  addrs;
 376         PTR32  len;
 377     } const *params32 = args;
 378
 379     struct get_serverlist_params params =
 380     {
 381         params32->family,
 382         ULongToPtr(params32->addrs),
 383         ULongToPtr(params32->len)
 384     };
 385
 386     return resolv_get_serverlist( &params );
 387 }
 388
 389 static NTSTATUS wow64_resolv_query( void *args )
 390 {
 391     struct
 392     {
 393         PTR32  name;
 394         WORD   type;
 395         DWORD  options;
 396         PTR32  buf;
 397         PTR32  len;
 398     } const *params32 = args;
 399
 400     struct query_params params =
 401     {
 402         ULongToPtr(params32->name),
 403         params32->type,
 404         params32->options,
 405         ULongToPtr(params32->buf),
 406         ULongToPtr(params32->len)
 407     };
 408
 409     return resolv_query( &params );
 410 }
 411
 412 const unixlib_entry_t __wine_unix_call_wow64_funcs[] =
 413 {
 414     wow64_resolv_get_searchlist,
 415     wow64_resolv_get_serverlist,
 416     resolv_set_serverlist,
 417     wow64_resolv_query,
 418 };
 419
 420 C_ASSERT( ARRAYSIZE(__wine_unix_call_wow64_funcs) == unix_funcs_count );
 421
 422 #endif  /* _WIN64 */
 423
 424 #endif /* HAVE_RESOLV */