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dnsapi: Fall back to a netbios query when a dns query fails.

This commit is contained in:
Hans Leidekker 2006-05-31 15:46:58 +02:00 committed by Alexandre Julliard
parent 0b6dbde473
commit 02ca30e8f9
2 changed files with 79 additions and 1 deletions
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2
dlls/dnsapi/Makefile.in
View File

@ -4,7 +4,7 @@ SRCDIR = @srcdir@
VPATH = @srcdir@
MODULE = dnsapi.dll
IMPORTLIB = libdnsapi.$(IMPLIBEXT)
IMPORTS = kernel32
IMPORTS = netapi32 kernel32
EXTRALIBS = $(LIBUNICODE) @RESOLVLIBS@
C_SRCS = \

78
dlls/dnsapi/query.c
View File

@ -44,6 +44,7 @@
#include "winerror.h"
#include "winnls.h"
#include "windns.h"
#include "nb30.h"
#include "dnsapi.h"
@ -472,6 +473,76 @@ static DNS_STATUS dns_copy_record( ns_msg msg, ns_sect section,
return ERROR_SUCCESS;
}
#define DEFAULT_TTL 1200
static DNS_STATUS dns_do_query_netbios( PCSTR name, DNS_RECORDA **recp )
{
NCB ncb;
UCHAR ret;
DNS_RRSET rrset;
FIND_NAME_BUFFER *buffer;
FIND_NAME_HEADER *header;
DNS_RECORDA *record = NULL;
unsigned int i, len;
len = strlen( name );
if (len >= NCBNAMSZ) return DNS_ERROR_RCODE_NAME_ERROR;
DNS_RRSET_INIT( rrset );
memset( &ncb, 0, sizeof(ncb) );
ncb.ncb_command = NCBFINDNAME;
memset( ncb.ncb_callname, ' ', sizeof(ncb.ncb_callname) );
memcpy( ncb.ncb_callname, name, len );
ncb.ncb_callname[NCBNAMSZ] = '\0';
ret = Netbios( &ncb );
if (ret != NRC_GOODRET) return ERROR_INVALID_NAME;
header = (FIND_NAME_HEADER *)ncb.ncb_buffer;
buffer = (FIND_NAME_BUFFER *)((char *)header + sizeof(FIND_NAME_HEADER));
for (i = 0; i < header->node_count; i++)
{
record = dns_zero_alloc( sizeof(DNS_RECORDA) );
if (!record)
{
ret = ERROR_NOT_ENOUGH_MEMORY;
goto exit;
}
else
{
record->pName = dns_strdup_u( name );
if (!record->pName)
{
ret = ERROR_NOT_ENOUGH_MEMORY;
goto exit;
}
record->wType = DNS_TYPE_A;
record->Flags.S.Section = DnsSectionAnswer;
record->Flags.S.CharSet = DnsCharSetUtf8;
record->dwTtl = DEFAULT_TTL;
/* FIXME: network byte order? */
record->Data.A.IpAddress = *(DWORD *)((char *)buffer[i].destination_addr + 2);
DNS_RRSET_ADD( rrset, (DNS_RECORD *)record );
}
}
exit:
DNS_RRSET_TERMINATE( rrset );
if (ret != ERROR_SUCCESS)
DnsRecordListFree( (DNS_RECORD *)record, DnsFreeRecordList );
else
*recp = (DNS_RECORDA *)rrset.pFirstRR;
return ret;
}
/* The resolver lock must be held and res_init() must have been
* called before calling these three functions.
*/
@ -636,6 +707,13 @@ DNS_STATUS WINAPI DnsQuery_UTF8( PCSTR name, WORD type, DWORD options, PIP4_ARRA
ret = dns_do_query( name, type, options, result );
if (ret == DNS_ERROR_RCODE_NAME_ERROR && type == DNS_TYPE_A &&
!(options & DNS_QUERY_NO_NETBT))
{
TRACE( "dns lookup failed, trying netbios query\n" );
ret = dns_do_query_netbios( name, result );
}
UNLOCK_RESOLVER();
#endif