public TcpPacket HandleTcpPacket()
{
TcpPacket packet = new TcpPacket();
int source_port = HeaderParser.ToInt(this.Data, 0, 16);
int dest_port = HeaderParser.ToInt(this.Data, 16, 16);
int offset = HeaderParser.ToInt(this.Data, 96, 4) * 4;
packet.Source = new IPEndPoint(this.Source, source_port);
packet.Destination = new IPEndPoint(this.Destination, dest_port);
packet.Sequence = HeaderParser.ToUInt(this.Data, 32, 32);
packet.Acknowledgement = HeaderParser.ToUInt(this.Data, 64, 32);
packet.DataOffset = offset;
packet.Urgent = HeaderParser.ToByte(this.Data, 106, 1) != 0;
packet.Ack = HeaderParser.ToByte(this.Data, 107, 1) != 0;
packet.Push = HeaderParser.ToByte(this.Data, 108, 1) != 0;
packet.Reset = HeaderParser.ToByte(this.Data, 109, 1) != 0;
packet.Syn = HeaderParser.ToByte(this.Data, 110, 1) != 0;
packet.Fin = HeaderParser.ToByte(this.Data, 111, 1) != 0;
packet.WindowSize = HeaderParser.ToInt(this.Data, 112, 16);
packet.Checksum = HeaderParser.ToInt(this.Data, 128, 16);
packet.UrgentPointer = HeaderParser.ToInt(this.Data, 144, 16);
if (offset > 20)
{
packet.SetData(this.Data, 20, offset - 20);
}
packet.SetData(this.Data, offset, this.Data.Length - offset);
return(packet);
}
public bool SetFields(Byte[] buffer)
{
if (buffer.Length >= this.HeaderLength_)
{
int [] x = new int[2];
for (int i = 0; i < Keys_.Count; i++)
{
x = (int[])FieldLengths_[Keys_[i]];
if (x[1] <= 8)
{
Fields_.Add(Keys_[i], HeaderParser.ToByte(buffer, x[0], x[1]));
}
else if (x[1] <= 16)
{
Fields_.Add(Keys_[i], HeaderParser.ToInt(buffer, x[0], x[1]));
}
else if (x[1] <= 32)
{
Fields_.Add(Keys_[i], HeaderParser.ToUInt(buffer, x[0], x[1]));
}
}
this.SetData(buffer, this.HeaderLength_, buffer.Length - this.HeaderLength_);
Length_ = buffer.Length;
return(true);
}
return(false);
}
public IcmpPacket HandleIcmpPacket()
{
IcmpPacket packet = new IcmpPacket();
packet.Source = new IPEndPoint(this.Source, 0);
packet.Destination = new IPEndPoint(this.Destination, 0);
packet.Type = HeaderParser.ToByte(this.Data, 0, 8);
packet.Code = HeaderParser.ToByte(this.Data, 8, 8);
packet.Checksum = HeaderParser.ToUShort(this.Data, 16, 16);
packet.SetData(this.Data, 4, this.Data.Length - 4);
return(packet);
}
