/// <summary>
/// using the raw and current system time to initialize the packet;
/// </summary>
/// <param name="raw"></param>
/// <param name="time"></param>
public Packet(byte[] raw, bool isIpv6)
{
///all the following exceptions should be caught when invoking this constructor;
if (raw == null)
{
throw new ArgumentNullException();
}
///when the orginal length is less than the header lenght of ipv6 = 40, it must be wrong;
if (raw.Length < 40)
{
throw new ArgumentException();
}
PacketV6 ipv6Data = new PacketV6();
ipv6Data = ipv6Data.Create(raw);
raw_Packet = raw;
dateTime = DateTime.Now;
headLength = ipv6Data.Ipv6HeaderLength;
src_IPAddress = ipv6Data.ipSourceAddress;
des_IPAddress = ipv6Data.ipDestinationAddress;
totalLength = ipv6Data.ipPayloadLength;
//Baseado na tabela no site da cisco https://www.cisco.com/en/US/technologies/tk648/tk872/technologies_white_paper0900aecd8054d37d.html
switch (ipv6Data.ipNextHeader)
{
case 6:
protocolType = ProtocolType.TCP;
break;
case 17:
protocolType = ProtocolType.UDP;
break;
case 58:
protocolType = ProtocolType.ICMP;
break;
default:
protocolType = ProtocolType.OTHERS;
break;
}
}
/// <summary>
/// This routine creates an instance of the Ipv6Header class from a byte
/// array that is a received IGMP packet. This is useful when a packet
/// is received from the network and the header object needs to be
/// constructed from those values.
/// </summary>
/// <param name="ipv6Packet">Byte array containing the binary IPv6 header</param>
/// <returns>Returns the Ipv6Header object created from the byte array</returns>
public PacketV6 Create(byte[] ipv6Packet)
{
PacketV6 ipv6Header = new PacketV6();
if (ipv6Packet.Length < ipv6Header.Ipv6HeaderLength)
{
return(null);
}
byte[] addressBytes = new byte[16];
uint tempVal, tempVal2;
tempVal = ipv6Packet[0];
tempVal = (tempVal >> 4) & 0xF;
ipv6Header.ipVersion = (byte)tempVal;
tempVal = ipv6Packet[0];
tempVal = (tempVal & 0xF) >> 4;
ipv6Header.ipTrafficClass = (byte)(tempVal | (uint)((ipv6Packet[1] >> 4) & 0xF));
tempVal2 = ipv6Packet[1];
tempVal2 = (tempVal2 & 0xF) << 16;
tempVal = ipv6Packet[2];
tempVal = tempVal << 8;
ipv6Header.ipFlow = tempVal2 | tempVal | ipv6Packet[3];
ipv6Header.ipNextHeader = ipv6Packet[4];
ipv6Header.ipHopLimit = ipv6Packet[5];
Array.Copy(ipv6Packet, 6, addressBytes, 0, 16);
ipv6Header.ipSourceAddress = new IPAddress(addressBytes);
Array.Copy(ipv6Packet, 24, addressBytes, 0, 16);
ipv6Header.ipDestinationAddress = new IPAddress(addressBytes);
return(ipv6Header);
}
