Example #1
0
        // =====================

        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);
            }
        }
Example #2
0
        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)));
        }