public static string GetTXTRecord(string domain)
{
IntPtr recordsArray = IntPtr.Zero;
IntPtr dnsRecord = IntPtr.Zero;
flags.TXTRecord txtRecord;
flags.IP4_ARRAY dnsServerArray = new flags.IP4_ARRAY();
uint address = BitConverter.ToUInt32(IPAddress.Parse(GetDnsAdress().ToString()).GetAddressBytes(), 0);
uint[] ipArray = new uint[1];
ipArray.SetValue(address, 0);
dnsServerArray.AddrCount = 1;
dnsServerArray.AddrArray = new uint[1];
dnsServerArray.AddrArray[0] = address;
ArrayList recordList = new ArrayList();
try
{
int queryResult = Interop.DnsQuery(ref domain, flags.DnsRecordTypes.DNS_TYPE_TXT, flags.DnsQueryOptions.DNS_QUERY_BYPASS_CACHE, ref dnsServerArray, ref recordsArray, 0);
if (queryResult != 0)
{
throw new Win32Exception(queryResult);
}
for (dnsRecord = recordsArray; !dnsRecord.Equals(IntPtr.Zero); dnsRecord = txtRecord.pNext)
{
txtRecord = (flags.TXTRecord)Marshal.PtrToStructure(dnsRecord, typeof(flags.TXTRecord));
if (txtRecord.wType == (int)flags.DnsRecordTypes.DNS_TYPE_TXT)
{
string txt = Marshal.PtrToStringAuto(txtRecord.pStringArray);
recordList.Add(txt);
}
}
}
finally
{
Interop.DnsRecordListFree(recordsArray, 0);
}
return((string)recordList[0]);
}
public static extern int DnsQuery([MarshalAs(UnmanagedType.VBByRefStr)] ref string pszName, flags.DnsRecordTypes wType, flags.DnsQueryOptions options, ref flags.IP4_ARRAY dnsServerIpArray, ref IntPtr ppQueryResults, int pReserved);