public byte[] Processing(Ipv4 ip4)
{
if (ip4.NextProtocol != 0x2f)
{
return(ip4.IpData);
}
this.Data = ip4.Payload;
return(this.Payload);
}
private void AddIp(Ipv4 packet)
{
var newList = new Ip
{
Indentifivation = packet.Indentification,
IpSource = packet.Source,
IpDestination = packet.Destination,
Data = new List <byte>(packet.Payload),
NextProtocol = packet.NextProtocol
};
this.ips.Add(newList);
}
/// <summary>
/// Fragmentation packet in byte mode.
/// </summary>
/// <param name="ippacket">
/// The ippacket.
/// </param>
/// <param name="shearchIp">
/// The shearch Ip.
/// </param>
/// <returns>
/// Fragmentation packet in byte array.
/// </returns>
public byte[] Processing(byte[] ippacket, bool shearchIp = true)
{
var ipPacket = new Ipv4(ippacket);
if (ipPacket.IsCorrect())
{
if (!this.IsExist(ipPacket.Indentification))
{
if (ipPacket.Fragmentation)
{
this.AddIp(ipPacket);
return(null);
}
return(ipPacket.IpData);
}
if (this.IsExist(ipPacket.Indentification))
{
Ip selected = this.SelectIp(ipPacket.Indentification);
if (ipPacket.Fragmentation)
{
selected.Data.AddRange(ipPacket.Payload);
return(null);
}
if (!ipPacket.Fragmentation)
{
selected.Data.AddRange(ipPacket.IpData);
var result = new Ipv4(this.GenerateIp(selected));
this.fragmentedIppacket += 1;
Debug.WriteLine("Fragmetation ip packet");
return(result.IpData);
}
}
}
return(null);
}
private byte[] GenerateIp(Ip select)
{
Ip conection = select;
var result = new byte[conection.Data.Count + 20];
result[0] = 0x45;
result[1] = 0x00;
result[2] = (byte)(result.Length / 256);
result[3] = (byte)(result.Length - (result[2] * 256));
result[4] = conection.Indentifivation[0];
result[5] = conection.Indentifivation[1];
result[6] = 64;
result[7] = 0;
result[8] = 0x39;
result[9] = conection.NextProtocol;
Array.Copy(conection.IpSource, 0, result, 12, 4);
Array.Copy(conection.IpDestination, 0, result, 16, 4);
byte[] checkSum = Ipv4.CheckSum(result);
result[10] = checkSum[0];
result[11] = checkSum[1];
Array.Copy(select.Data.ToArray(), 0, result, 20, result.Length - 20);
this.ips.Remove(select);
return(result);
}
public List <byte[]> Shearch(byte[] indata)
{
if (IsBuffer)
{
var buffData = buff.GetData();
var result = new byte[indata.Length + buffData.Length];
System.Buffer.BlockCopy(buffData, 0, result, 0, buffData.Length);
System.Buffer.BlockCopy(indata, 0, result, buffData.Length, indata.Length);
indata = result;
}
var resultPacket = new List <byte[]>();
int index = StartPosition;
while (index < indata.Length - 20)
{
if (indata[index] != 0x45)
{
index += 1;
continue;
}
if (this.NextProtocol != null)
{
if (!this.NextProtocol.Contains(indata[index + 9]))
{
index += 1;
continue;
}
}
if (this.CheckChecksum)
{
if (Ipv4.ComputeHeaderIpChecksum(indata, index, 20) != 0)
{
index += 1;
continue;
}
}
int lengthPacket = indata[index + 2] << 8;
lengthPacket += indata[index + 3];
if (lengthPacket > 1600)
{
index += 1;
continue;
}
if ((lengthPacket + index) > indata.Length)
{
break;
}
var result = new byte[lengthPacket];
Buffer.BlockCopy(indata, index, result, 0, result.Length);
resultPacket.Add(result);
index += 20;
}
if (this.IsBuffer)
{
var delta = new byte[indata.Length - index];
System.Buffer.BlockCopy(indata, index, delta, 0, delta.Length);
this.buff.AddData(delta);
}
return(resultPacket);
}