// =====================
static string LookupIPAddressUsingAltNetNS(string nodename, string AltNetNameServerIP)
{
string ip_string = "0.0.0.0";
try
{
// LogMessage("LookupIPAddressUsingAltNetNS: start: looking up: " + nodename + ", using NS at " + AltNetNameServerIP + ".");
string[] s = DnsA.GetARecords(nodename, AltNetNameServerIP);
int listlen = s.Length;
// LogMessage("LookupIPAddressUsingAltNetNS. Entries found: " + listlen.ToString());
foreach (string st in s)
{
ip_string = st;
break;
//Console.ReadLine();
}
if (ip_string.IndexOf(":") >= 0)
{
return("Error in LookupIPAddressUsingAltNetNS(): We can only handle IPv4 hosts. IPv6 address returned for " + nodename + ".");
}
LogMessage("LookupIPAddressUsingAltNetNS, success: IP: '" + ip_string + "'.");
return(ip_string);
}
catch (Exception ex)
{
// LogMessage("LookupIPAddressUsingAltNetNS, error: IP: " + ip_string + ".");
return("Error in LookupIPAddressUsingAltNetNS(): " + ex.Message);
}
}
public static string[] GetARecords(string domain, string NSIP)
{
// DNSIntercept.Main.LogMessage("GetARecords: start. Domain: '" + domain + "', NS: '" + NSIP + "'.");
IntPtr ptr1 = IntPtr.Zero;
IntPtr ptr2 = IntPtr.Zero;
ARecord recA;
if (Environment.OSVersion.Platform != PlatformID.Win32NT)
{
throw new NotSupportedException();
}
ArrayList list1 = new ArrayList();
uint address = BitConverter.ToUInt32(IPAddress.Parse(NSIP).GetAddressBytes(), 0);
// This is OK: DNSIntercept.Main.LogMessage("GetARecords: NS: " + NSIP + "=" + address.ToString());
uint[] ipArray = new uint[1];
ipArray.SetValue(address, 0);
IP4_ARRAY dnsServerArray = new IP4_ARRAY();
dnsServerArray.AddrCount = 1;
dnsServerArray.AddrArray = new uint[1];
dnsServerArray.AddrArray[0] = address;
int num1 = DnsA.DnsQuery(ref domain, QueryTypes.DNS_TYPE_A, QueryOptions.DNS_QUERY_BYPASS_CACHE, ref dnsServerArray, ref ptr1, 0);
if (num1 != 0)
{
// OK, this will throw errors like DNS host not found,
// for an NXDomain response from DNS server
// (which we trap anyhow, using a match in the error string).
throw new Win32Exception(num1);
}
long lipadd = 0;
int cnt = 1;
for (ptr2 = ptr1; !ptr2.Equals(IntPtr.Zero); ptr2 = recA.pNext)
{
recA = (ARecord)Marshal.PtrToStructure(ptr2, typeof(ARecord));
if (recA.wType == 1)
{
if (cnt == 1)
{
lipadd = recA.wIPAddress;
if (lipadd == 0)
{
// DNSIntercept.Main.LogMessage("GetARecords: DNSQuery for .altnet domain returned 0.0.0.0.");
}
string text1 = long2ip(lipadd);
list1.Add(text1);
// DNSIntercept.Main.LogMessage("GetARecords: Adding: " + text1);
}
}
cnt = cnt + 1;
}
DnsA.DnsRecordListFree(ptr2, 0);
return((string[])list1.ToArray(typeof(string)));
}