Ejemplo n.º 1
0
 /// <summary>
 /// Creates a new instance of this class
 /// </summary>
 public IPv4Frame()
 {
     this.iVersion         = 4;
     this.tosTypeOfService = new IPTypeOfService();
     this.iIdentification  = 0;
     this.ifFlags          = new IPFlags(false, false);
     this.iFragmentOffset  = 0;
     this.iTimeToLive      = 0xFF;
     this.iProtocol        = IPProtocol.Other;
     this.ipaSource        = IPAddress.Any;
     this.ipaDestination   = IPAddress.Any;
     this.ipoOptions       = new IPv4Options();
 }
Ejemplo n.º 2
0
        /// <summary>
        /// Creates a new instance of this class by parsing the given data.
        /// </summary>
        /// <param name="bRaw">The data to parse</param>
        public IPv4Frame(byte[] bRaw)
        {
            int iHeaderLength;
            int iTotalLength;

            if (bRaw.Length < 20)
            {
                throw new ArgumentException("Invalid packet");
            }

            this.iVersion      = (bRaw[0] & 0xF0) >> 4;
            iHeaderLength      = (bRaw[0] & 0x0F) * 4;
            this.iHeaderLength = iHeaderLength;

            if (iHeaderLength < 20)
            {
                throw new ArgumentException("Invalid packet header");
            }

            this.tosTypeOfService = new IPTypeOfService(bRaw[1]);
            iTotalLength          = (int)bRaw[2] * 256 + (int)bRaw[3];

            if (iTotalLength > bRaw.Length)
            {
                throw new ArgumentException("Corrupt packet length");
            }

            this.iIdentification  = bRaw[4] * (uint)256 + bRaw[5];
            this.ifFlags          = new IPFlags((bRaw[6] & 0x40) != 0, ((bRaw[6] & 0x20)) != 0);
            this.iFragmentOffset  = 0;
            this.iFragmentOffset |= (byte)((bRaw[6] & 0x1F) << 8);
            this.iFragmentOffset |= (byte)(bRaw[7]);
            this.iTimeToLive      = bRaw[8];

            if (Enum.IsDefined(typeof(IPProtocol), (int)bRaw[9]))
            {
                this.iProtocol = (IPProtocol)bRaw[9];
            }
            else
            {
                this.iProtocol = IPProtocol.Other;
            }

            ipaSource      = new IPAddress(BitConverter.ToUInt32(bRaw, 12));
            ipaDestination = new IPAddress(BitConverter.ToUInt32(bRaw, 16));

            if (iHeaderLength > 20)
            {
                byte[] bOptionData = new byte[iHeaderLength - 20];

                for (int iC1 = 20; iC1 < iHeaderLength - 20; iC1++)
                {
                    bOptionData[iC1] = bRaw[iC1 + 20];
                }
                this.ipoOptions = new IPv4Options(bOptionData);
            }
            else
            {
                this.ipoOptions = new IPv4Options();
            }

            Encapsulate(bRaw, iHeaderLength, iTotalLength - iHeaderLength);
        }