unsafe public int GetINTERNETPart(int CurrentPtr)
{
byte b = 0;
ushort us = 0;
byte * ptr = ( byte * )CurrentPtr;
ushort *usptr = ( ushort * )CurrentPtr;
b = *(ptr++);
PInternet.Version = (byte)((int)b >> 4);
PInternet.HeaderLength = (byte)(((int)b & 0x0f) * 4);
b = *(ptr++);
PInternet.DifferentiatedServicesField = b;
PInternet.DifferentiatedServicesFieldStr = "";
if ((b & 0x0d) > 0)
{
PInternet.DifferentiatedServicesFieldStr += "Differentiated Services Codepoint ( Default : 0x00 ),";
}
if ((b & 0x02) > 0)
{
PInternet.DifferentiatedServicesFieldStr += "ECN Capable Transport ( ECT ),";
}
if ((b & 0x01) > 0)
{
PInternet.DifferentiatedServicesFieldStr += "ECN-CE,";
}
if (PInternet.DifferentiatedServicesFieldStr != "")
{
PInternet.DifferentiatedServicesFieldStr = PInternet.DifferentiatedServicesFieldStr.Substring(0, PInternet.DifferentiatedServicesFieldStr.Length - 1);
}
us = AllFunctions.Get2Bytes(ptr, NORMAL); ptr += 2;
PInternet.Length = us;
us = AllFunctions.Get2Bytes(ptr, NORMAL); ptr += 2;
PInternet.Identification = us;
us = AllFunctions.Get2Bytes(ptr, NORMAL); ptr += 2;
PInternet.Flags = (byte)((int)us >> 12);
if ((PInternet.Flags & 0x04) > 0)
{
PInternet.FlagsStr = "Dont fragment";
}
if ((PInternet.Flags & 0x02) > 0)
{
PInternet.FlagsStr = "More fragments";
}
PInternet.FragmentOffset = (ushort)((int)us & 0x0f);
b = *(ptr++);
PInternet.TimeToLive = b;
b = *(ptr++);
PInternet.Protocol = b;
PInternet.ProtocolStr = GetProtocolStr((int)b);
us = AllFunctions.Get2Bytes(ptr, NORMAL); ptr += 2;
PInternet.HeaderChecksum = us;
PInternet.SourceStr = "";
b = *(ptr++);
PInternet.SourceStr += b.ToString() + ".";
b = *(ptr++);
PInternet.SourceStr += b.ToString() + ".";
b = *(ptr++);
PInternet.SourceStr += b.ToString() + ".";
b = *(ptr++);
PInternet.SourceStr += b.ToString();
PInternet.Source = (uint)AllFunctions.IpAddressToInt(PInternet.SourceStr);
PInternet.DestinationStr = "";
b = *(ptr++);
PInternet.DestinationStr += b.ToString() + ".";
b = *(ptr++);
PInternet.DestinationStr += b.ToString() + ".";
b = *(ptr++);
PInternet.DestinationStr += b.ToString() + ".";
b = *(ptr++);
PInternet.DestinationStr += b.ToString();
PInternet.Destination = (uint)AllFunctions.IpAddressToInt(PInternet.DestinationStr);
return(CurrentPtr + PACKET_INTERNET_LENGTH);
}