Exemple #1
0
        private void ParseData(byte[] byteData, int nReceived)
        {
            IPHeader ipHeader = new IPHeader(byteData, nReceived);

            switch (ipHeader.ProtocolType)
            {
            /*case Protocol.TCP: {
             *  TCPHeader tcpHeader = new TCPHeader(ipHeader.Data, ipHeader.MessageLength);
             *  if (tcpHeader.Flags.Equals("0x18 (PSH, ACK)")) {
             *      byte[] data = new byte[(int)ipHeader.MessageLength];
             *      for (int i = 0; i < data.Length; i++) data[i] = tcpHeader.Data[i];
             *      string content = Encoding.ASCII.GetString(data);
             *      if (content.StartsWith("GET ")) parseData(ipHeader, tcpHeader, content, true);
             *      else if (content.StartsWith("HTTP/1.1 ")) parseData(ipHeader, tcpHeader, content, false);
             *  }
             *  break;
             * }*/
            case Protocol.UDP: {
                UDPHeader udpHeader       = new UDPHeader(ipHeader.Data, ipHeader.MessageLength);
                int       destinationPort = Int32.Parse(udpHeader.DestinationPort);
                int       sourcePort      = Int32.Parse(udpHeader.SourcePort);

                if (destinationPort == 53 || sourcePort == 53)
                {
                    byte[] fillBuffer = new byte[ipHeader.MessageLength];
                    string result     = string.Empty;
                    for (int i = 0, c = 0; i < fillBuffer.Length; i++)
                    {
                        int byteInt = ipHeader.Data[i];
                        if (byteInt < 32)
                        {
                            if (c > 3 && result.Length > 0)
                            {
                                result += ".";
                            }
                            else
                            {
                                c++;
                            }
                        }
                        else if (byteInt > 32 && byteInt < 127)
                        {
                            result += (char)byteInt;
                        }
                    }

                    char[] charArray = result.ToCharArray();
                    char   oldChar   = '.';
                    for (int i = 0; i < charArray.Length; i++)
                    {
                        if (i > 3 && charArray[i] != oldChar && charArray[i - 1] == oldChar && charArray[i - 2] == oldChar)
                        {
                            result = string.Empty;
                            for (int j = i; j < charArray.Length; j++)
                            {
                                result += charArray[j];
                            }
                            break;
                        }
                        oldChar = charArray[i];
                    }
                    result = result.Replace(".....", "");
                    Console.WriteLine("DNS: " + result);
                }
                break;
            }

            default: {
                break;
            }
            }
        }
Exemple #2
0
        private void ParseData(byte[] byteData, int nReceived)
        {
            IPHeader ipHeader = new IPHeader(byteData, nReceived);
            switch (ipHeader.ProtocolType) {
                /*case Protocol.TCP: {
                    TCPHeader tcpHeader = new TCPHeader(ipHeader.Data, ipHeader.MessageLength);
                    if (tcpHeader.Flags.Equals("0x18 (PSH, ACK)")) {
                        byte[] data = new byte[(int)ipHeader.MessageLength];
                        for (int i = 0; i < data.Length; i++) data[i] = tcpHeader.Data[i];
                        string content = Encoding.ASCII.GetString(data);
                        if (content.StartsWith("GET ")) parseData(ipHeader, tcpHeader, content, true);
                        else if (content.StartsWith("HTTP/1.1 ")) parseData(ipHeader, tcpHeader, content, false);
                    }
                    break;
                }*/
                case Protocol.UDP: {
                    UDPHeader udpHeader = new UDPHeader(ipHeader.Data, ipHeader.MessageLength);
                    int destinationPort = Int32.Parse(udpHeader.DestinationPort);
                    int sourcePort = Int32.Parse(udpHeader.SourcePort);

                    if (destinationPort == 53 || sourcePort == 53) {
                        byte[] fillBuffer = new byte[ipHeader.MessageLength];
                        string result = string.Empty;
                        for (int i = 0, c=0; i < fillBuffer.Length; i++) {
                            int byteInt = ipHeader.Data[i];
                            if (byteInt < 32) {
                                if (c > 3 && result.Length > 0) result += ".";
                                else c++;
                            }
                            else if (byteInt > 32 && byteInt < 127) result += (char)byteInt;
                        }

                        char[] charArray = result.ToCharArray();
                        char oldChar = '.';
                        for (int i = 0; i < charArray.Length; i++) {
                            if (i > 3 && charArray[i] != oldChar && charArray[i-1] == oldChar && charArray[i-2] == oldChar) {
                                result = string.Empty;
                                for (int j = i; j < charArray.Length; j++) result += charArray[j];
                                break;
                            }
                            oldChar = charArray[i];
                        }
                        result = result.Replace(".....", "");
                        Console.WriteLine("DNS: " + result);
                    }
                    break;
                }
                default: {
                    break;
                }
            }
        }