public override void CalculateCheckSum(byte[] srcIP, byte[] dstIP)
{
int pHeaderLen = (12) + HeaderLength + data.Length;
if ((pHeaderLen & 1) != 0)
{
pHeaderLen += 1;
}
byte[] headerSegment = new byte[pHeaderLen];
byte[] nullBytes = new byte[2];
Utils.memcpy(ref headerSegment, 0, srcIP, 0, 4);
Utils.memcpy(ref headerSegment, 4, dstIP, 0, 4);
//[8] = 0
headerSegment[9] = 0x11;
Utils.memcpy(ref headerSegment, 10, BitConverter.GetBytes(NO_Length), 0, 2);
//Pseudo Header added
//Rest of data is normal neader+data
Utils.memcpy(ref headerSegment, 12, BitConverter.GetBytes(NO_srcPort), 0, 2);
Utils.memcpy(ref headerSegment, 14, BitConverter.GetBytes(NO_dstPort), 0, 2);
Utils.memcpy(ref headerSegment, 16, BitConverter.GetBytes(NO_Length), 0, 2);
Utils.memcpy(ref headerSegment, 18, nullBytes, 0, 2); //zero out csum
Utils.memcpy(ref headerSegment, 20, data, 0, data.Length);
Checksum = IPPacket.InternetChecksum(headerSegment); //For performance, we can set this to = zero
Console.Error.WriteLine();
}
public override bool VerifyCheckSum(byte[] srcIP, byte[] dstIP)
{
int pHeaderLen = (12) + HeaderLength + data.Length;
if ((pHeaderLen & 1) != 0)
{
//Console.Error.WriteLine("OddSizedPacket");
pHeaderLen += 1;
}
byte[] headerSegment = new byte[pHeaderLen];
Utils.memcpy(ref headerSegment, 0, srcIP, 0, 4);
Utils.memcpy(ref headerSegment, 4, dstIP, 0, 4);
//[8] = 0
headerSegment[9] = 0x11;
Utils.memcpy(ref headerSegment, 10, BitConverter.GetBytes(NO_Length), 0, 2);
//Pseudo Header added
//Rest of data is normal neader+data
Utils.memcpy(ref headerSegment, 12, BitConverter.GetBytes(NO_srcPort), 0, 2);
Utils.memcpy(ref headerSegment, 14, BitConverter.GetBytes(NO_dstPort), 0, 2);
Utils.memcpy(ref headerSegment, 16, BitConverter.GetBytes(NO_Length), 0, 2);
Utils.memcpy(ref headerSegment, 18, BitConverter.GetBytes(NO_csum), 0, 2);
Utils.memcpy(ref headerSegment, 20, data, 0, data.Length);
UInt16 CsumCal = IPPacket.InternetChecksum(headerSegment);
//Console.Error.WriteLine("UDP Checksum Good = " + (CsumCal == 0));
return(CsumCal == 0);
}
public override bool VerifyCheckSum(byte[] srcIP, byte[] dstIP)
{
int pHeaderLen = ((Length));
if ((pHeaderLen & 1) != 0)
{
//Console.Error.WriteLine("OddSizedPacket");
pHeaderLen += 1;
}
byte[] headerSegment = new byte[pHeaderLen];
Utils.memcpy(ref headerSegment, 0, GetBytes(), 0, Length);
UInt16 CsumCal = IPPacket.InternetChecksum(headerSegment);
//Console.Error.WriteLine("IMCP Checksum Good = " + (CsumCal == 0));
return(CsumCal == 0);
}
public override void CalculateCheckSum(byte[] srcIP, byte[] dstIP)
{
int pHeaderLen = ((Length));
if ((pHeaderLen & 1) != 0)
{
//Console.Error.WriteLine("OddSizedPacket");
pHeaderLen += 1;
}
byte[] headerSegment = new byte[pHeaderLen];
Utils.memcpy(ref headerSegment, 0, GetBytes(), 0, Length);
byte[] nullcsum = new byte[2];
Utils.memcpy(ref headerSegment, 2, nullcsum, 0, 2);
Checksum = IPPacket.InternetChecksum(headerSegment);
}