//public List<DnsRecord> Lookup
//(
// string szDomain,
// UInt16 dnstype,
// UInt32 querytype
//)
//{
// return HiddenLookup (ref szDomain, dnstype, querytype);
//}
private List <DnsRecord> HiddenLookup(string domain, DnsTypes dnstype, DnsQueryTypes querytype)
{
List <DnsRecord> records = null;
try
{
UInt32 queryResultsSet = 0;
if ((BypassCache) || (_dnsServer != null))
{
querytype |= DnsQueryTypes.BypassCache;
}
byte[] data = null;
if (_dnsServer != null)
{
data = new Byte [Marshal.SizeOf(typeof(UInt32)) * 2];
var memoryWriter = new BinaryWriter(new MemoryStream(data));
memoryWriter.Write((UInt32)1);
byte [] address = _dnsServer.GetAddressBytes();
memoryWriter.Write(address);
}
uint dnsLookupResult = NativeMethods.DnsQuery(domain, (ushort)dnstype, (uint)querytype, data, ref queryResultsSet, 0);
if (dnsLookupResult == 0)
{
records = new List <DnsRecord> ();
var results = new IntPtr(queryResultsSet);
do
{
var response = (ResponseStructure)Marshal.PtrToStructure(results, typeof(ResponseStructure));
DnsRecord newRecord = ResponseDecoder.Decode(results.ToInt32(), ref response);
records.Add(newRecord);
results = response.next;
} while (results.ToInt32() != 0);
if (records.Count > 0)
{
NativeMethods.DnsRecordListFree(ref queryResultsSet, 1);
}
}
}
catch (COMException)
{
}
return(records);
}
public static extern int DnsQuery([MarshalAs(UnmanagedType.VBByRefStr)] ref string pszName, DnsQueryTypes wType, DnsQueryOptions options, int aipServers, ref IntPtr ppQueryResults, int pReserved);
public static extern int DnsQuery([MarshalAs(UnmanagedType.VBByRefStr)] ref string pszName, DnsQueryTypes wType, DnsQueryOptions options, int aipServers, ref IntPtr ppQueryResults, int pReserved);