public TCPPacket(IPv4Packet Packet) : base(Packet)
{
SourcePort = (payload[0] << 8) | payload[1];
DestPort = (payload[2] << 8) | payload[3];
SeqNumber = (payload[4] << 24) | (payload[5] << 16)
| (payload[6] << 8) | payload[7];
AckNumber = (payload[8] << 24) | (payload[9] << 16)
| (payload[10] << 8) | payload[11];
DataOffset = (payload[12] & 0xF0) >> 4;
NS = (payload[12] & 0x01) == 1;
CWR = (payload[13] & 0x80) == 1;
ECE = (payload[13] & 0x40) == 1;
URG = (payload[13] & 0x20) == 1;
ACK = (payload[13] & 0x10) == 1;
PSH = (payload[13] & 0x08) == 1;
RST = (payload[13] & 0x04) == 1;
SYN = (payload[13] & 0x02) == 1;
FIN = (payload[13] & 0x01) == 1;
WindowSize = (payload[14] << 8) | payload[15];
Checksum = (payload[16] << 8) | payload[17];
UrgentPointer = (payload[18] << 8) | payload[19];
if (DataOffset > 5)
{
Options = new byte[(DataOffset - 5) * 4];
Buffer.BlockCopy(payload, 20, Options, 0, (DataOffset - 5) * 4);
}
Data = new byte[Header.TotalLength - Header.IHL * 4 - DataOffset * 4];
Buffer.BlockCopy(payload, DataOffset * 4, Data, 0, Header.TotalLength - Header.IHL * 4 - DataOffset * 4);
}
public UDPPacket(IPv4Packet Packet) : base(Packet)
{
SourcePort = (payload[0] << 8) | payload[1];
DestPort = (payload[2] << 8) | payload[3];
Length = (payload[4] << 8) | payload[5];
Checksum = (payload[6] << 8) | payload[7];
Data = new byte[Length - 8];
Buffer.BlockCopy(payload, 8, Data, 0, Length - 8);
}
public ICMPPacket(IPv4Packet Packet) : base(Packet)
{
Type = payload[0];
Code = payload[1];
Checksum = (payload[2] << 8) | payload[3];
PingId = (payload[4] << 8) | payload[5];
PingSeq = (payload[6] << 8) | payload[7];
Data = new byte[payload.Length - 8];
Buffer.BlockCopy(payload, 8, Data, 0, payload.Length - 8);
}
public IPv4Packet(IPv4Packet Packet) : this(Packet.Header, Packet.payload)
{
}