public List <byte> ToArray()
{
byte x;
TotalLength = SetTotalLength();
List <byte> ret = new List <byte>();
ret.Add(BytesOP.MakeByte(Version, HeaderLength));
ret.Add(TypeOfService);
ret.Add(BytesOP.GetHighByte(TotalLength));
ret.Add(BytesOP.GetLowByte(TotalLength));
ret.Add(BytesOP.GetHighByte(Identification));
ret.Add(BytesOP.GetLowByte(Identification));
x = (byte)(Flags << 5);
x += (byte)(FragmentOffset >> 8);
ret.Add(x);
ret.Add(BytesOP.GetLowByte(FragmentOffset));
ret.Add(TimeToLive);
ret.Add(Protocol);
ret.Add(0x00);//校验和
ret.Add(0x00);
ret.Add(SourceAddress[0]);
ret.Add(SourceAddress[1]);
ret.Add(SourceAddress[2]);
ret.Add(SourceAddress[3]);
ret.Add(DastinationAddress[0]);
ret.Add(DastinationAddress[1]);
ret.Add(DastinationAddress[2]);
ret.Add(DastinationAddress[3]);
if (HeaderLength > 0x05)
{
for (int i = 0; i < ((HeaderLength - 0x05) * 4); i++)
{
ret.Add(Options[i]);
}
}
HeaderVerify = Verify.GetVerify_IP(ret.ToArray());
ret[10] = BytesOP.GetHighByte(HeaderVerify);
ret[11] = BytesOP.GetLowByte(HeaderVerify);
switch (Protocol)
{
case 0x06: //TCP
FakeTcpHeader fh = new FakeTcpHeader(SourceAddress, DastinationAddress);
fh.count = (ushort)(TotalLength - HeaderLength * 4);
TCPPacket tcp = (TCPPacket)oProtocolContent;
List <Byte> TCPList = tcp.ToArray(fh);
foreach (byte b in TCPList)
{
ret.Add(b);
}
break;
}
Identification++;
return(ret);
}
public List <byte> ToArray(FakeTcpHeader fh)
{
List <Byte> FakeTCP = new List <Byte>();
//构建TCP的伪首部
FakeTCP.Add(fh.SourceAddress[0]);
FakeTCP.Add(fh.SourceAddress[1]);
FakeTCP.Add(fh.SourceAddress[2]);
FakeTCP.Add(fh.SourceAddress[3]);
FakeTCP.Add(fh.DastinationAddress[0]);
FakeTCP.Add(fh.DastinationAddress[1]);
FakeTCP.Add(fh.DastinationAddress[2]);
FakeTCP.Add(fh.DastinationAddress[3]);
FakeTCP.Add(0x00);
FakeTCP.Add(0x06);
FakeTCP.Add(BytesOP.GetHighByte(fh.count));
FakeTCP.Add(BytesOP.GetLowByte(fh.count));
//伪首部完成
FakeTCP.Add(BytesOP.GetHighByte(SourcePort));
FakeTCP.Add(BytesOP.GetLowByte(SourcePort));
FakeTCP.Add(BytesOP.GetHighByte(DastinationPort));
FakeTCP.Add(BytesOP.GetLowByte(DastinationPort));
Union_UInt32 u32 = new Union_UInt32();
u32.ofs_32 = InitialSeqNumber;
FakeTCP.Add(u32.ofs_h.ofs_h);
FakeTCP.Add(u32.ofs_h.ofs_l);
FakeTCP.Add(u32.ofs_l.ofs_h);
FakeTCP.Add(u32.ofs_l.ofs_l);
u32.ofs_32 = AckSeqNumber;
FakeTCP.Add(u32.ofs_h.ofs_h);
FakeTCP.Add(u32.ofs_h.ofs_l);
FakeTCP.Add(u32.ofs_l.ofs_h);
FakeTCP.Add(u32.ofs_l.ofs_l);
FakeTCP.Add((byte)(DataOffset << 4));
FakeTCP.Add(TCPFlags);
FakeTCP.Add(BytesOP.GetHighByte(Window));
FakeTCP.Add(BytesOP.GetLowByte(Window));
int sumaddr = FakeTCP.Count;
FakeTCP.Add(0x00);
FakeTCP.Add(0x00);
FakeTCP.Add(BytesOP.GetHighByte(UrgentPoint));
FakeTCP.Add(BytesOP.GetLowByte(UrgentPoint));
if (DataOffset > 0x05)
{
for (int i = 0; i < ((DataOffset - 0x05) * 4); i++)
{
FakeTCP.Add(TCPOptions[i]);
}
}
foreach (byte b in Datas)
{
FakeTCP.Add(b);
}
CheckSum = Verify.GetVerify_IP(FakeTCP.ToArray());
FakeTCP[sumaddr] = BytesOP.GetHighByte(CheckSum);
FakeTCP[sumaddr + 1] = BytesOP.GetLowByte(CheckSum);
FakeTCP.RemoveRange(0, 12);
if (Datas.Count == 0)
{
if (TCPFlags == 0x02)
{
InitialSeqNumber++;
}
}
else
{
InitialSeqNumber += (uint)Datas.Count;
}
return(FakeTCP);
}