public static byte[] AddUdpIpHeader(IPEndPoint srcAdr, IPEndPoint dstAdr, byte[] packet)
{
srcAdr = new IPEndPoint(IPAddress.Parse("25.175.152.176"), 9959);
dstAdr = new IPEndPoint(IPAddress.Parse("25.175.152.176"), 9958);
byte[] builtPacket = new byte[packet.Length];
ArrayList headerList = new ArrayList();
UdpHeader udpPacket = new UdpHeader();
udpPacket.SourcePort = (ushort)srcAdr.Port;
udpPacket.DestinationPort = (ushort)dstAdr.Port;
udpPacket.Length = (ushort)(UdpHeader.UdpHeaderLength + packet.Length);
udpPacket.Checksum = 0;
if (srcAdr.AddressFamily == AddressFamily.InterNetwork)
{
Ipv4Header ipv4Packet = new Ipv4Header();
ipv4Packet.Version = 4;
ipv4Packet.Protocol = (byte)ProtocolType.Udp;
ipv4Packet.Ttl = 2;
ipv4Packet.Offset = 0;
ipv4Packet.Length = (byte)Ipv4Header.Ipv4HeaderLength;
ipv4Packet.TotalLength =
Convert.ToUInt16(Ipv4Header.Ipv4HeaderLength + UdpHeader.UdpHeaderLength + packet.Length);
ipv4Packet.SourceAddress = srcAdr.Address;
ipv4Packet.DestinationAddress = dstAdr.Address;
udpPacket.Ipv4PacketHeader = ipv4Packet;
headerList.Add(ipv4Packet);
}
else if (srcAdr.AddressFamily == AddressFamily.InterNetworkV6)
{
Ipv6Header ipv6Packet = new Ipv6Header();
ipv6Packet.Version = 6;
ipv6Packet.TrafficClass = 1;
ipv6Packet.Flow = 2;
ipv6Packet.HopLimit = 2;
ipv6Packet.NextHeader = (byte)ProtocolType.Udp;
ipv6Packet.PayloadLength = (ushort)(UdpHeader.UdpHeaderLength + packet.Length);
ipv6Packet.SourceAddress = srcAdr.Address;
ipv6Packet.DestinationAddress = dstAdr.Address;
udpPacket.Ipv6PacketHeader = ipv6Packet;
headerList.Add(ipv6Packet);
}
headerList.Add(udpPacket);
builtPacket = udpPacket.BuildPacket(headerList, packet);
return(builtPacket);
}
public static byte[] Construct(IPAddress sourceAddress, ushort sourcePort, IPAddress destinationAddress, ushort destinationPort, byte[] payload)
{
var bindAddress = IPAddress.Any;
// Make sure parameters are consistent
//if ((sourceAddress.AddressFamily != destinationAddress.AddressFamily) || (sourceAddress.AddressFamily != bindAddress.AddressFamily))
//{
// throw new Exception("Source and destination address families don't match!");
//}
// Start building the headers
byte[] builtPacket;
UdpHeader udpPacket = new UdpHeader();
ArrayList headerList = new ArrayList();
//Socket rawSocket = null;
//SocketOptionLevel socketLevel = SocketOptionLevel.IP;
// Fill out the UDP header first
Console.WriteLine("Filling out the UDP header...");
udpPacket.SourcePort = sourcePort;
udpPacket.DestinationPort = destinationPort;
udpPacket.Length = (ushort)(UdpHeader.UdpHeaderLength + payload.Length);
udpPacket.Checksum = 0;
if (sourceAddress.AddressFamily == AddressFamily.InterNetwork)
{
Ipv4Header ipv4Packet = new Ipv4Header();
// Build the IPv4 header
Console.WriteLine("Building the IPv4 header...");
ipv4Packet.Version = 4;
ipv4Packet.Protocol = (byte)ProtocolType.Udp;
ipv4Packet.Ttl = 2;
ipv4Packet.Offset = 0;
ipv4Packet.Length = (byte)Ipv4Header.Ipv4HeaderLength;
ipv4Packet.TotalLength = (ushort)System.Convert.ToUInt16(Ipv4Header.Ipv4HeaderLength + UdpHeader.UdpHeaderLength + payload.Length);
ipv4Packet.SourceAddress = sourceAddress;
ipv4Packet.DestinationAddress = destinationAddress;
// Set the IPv4 header in the UDP header since it is required to calculate the
// pseudo header checksum
Console.WriteLine("Setting the IPv4 header for pseudo header checksum...");
udpPacket.ipv4PacketHeader = ipv4Packet;
// Add IPv4 header to list of headers -- headers should be added in th order
// they appear in the packet (i.e. IP first then UDP)
Console.WriteLine("Adding the IPv4 header to the list of header, encapsulating packet...");
headerList.Add(ipv4Packet);
//socketLevel = SocketOptionLevel.IP;
}
else if (sourceAddress.AddressFamily == AddressFamily.InterNetworkV6)
{
Ipv6Header ipv6Packet = new Ipv6Header();
// Build the IPv6 header
Console.WriteLine("Building the IPv6 header...");
ipv6Packet.Version = 6;
ipv6Packet.TrafficClass = 1;
ipv6Packet.Flow = 2;
ipv6Packet.HopLimit = 2;
ipv6Packet.NextHeader = (byte)ProtocolType.Udp;
ipv6Packet.PayloadLength = (ushort)(UdpHeader.UdpHeaderLength + payload.Length);
ipv6Packet.SourceAddress = sourceAddress;
ipv6Packet.DestinationAddress = destinationAddress;
// Set the IPv6 header in the UDP header since it is required to calculate the
// pseudo header checksum
Console.WriteLine("Setting the IPv6 header for pseudo header checksum...");
udpPacket.ipv6PacketHeader = ipv6Packet;
// Add the IPv6 header to the list of headers - headers should be added in the order
// they appear in the packet (i.e. IP first then UDP)
Console.WriteLine("Adding the IPv6 header to the list of header, encapsulating packet...");
headerList.Add(ipv6Packet);
//socketLevel = SocketOptionLevel.IPv6;
}
// Add the UDP header to list of headers after the IP header has been added
Console.WriteLine("Adding the UDP header to the list of header, after IP header...");
headerList.Add(udpPacket);
// Convert the header classes into the binary on-the-wire representation
Console.WriteLine("Converting the header classes into the binary...");
builtPacket = udpPacket.BuildPacket(headerList, payload);
/*
* // Create the raw socket for this packet
* Console.WriteLine("Creating the raw socket using Socket()...");
* rawSocket = new Socket(sourceAddress.AddressFamily, SocketType.Raw, ProtocolType.Udp);
*
* // Bind the socket to the interface specified
* Console.WriteLine("Binding the socket to the specified interface using Bind()...");
* rawSocket.Bind(new IPEndPoint(bindAddress, 0));
*
* // Set the HeaderIncluded option since we include the IP header
* Console.WriteLine("Setting the HeaderIncluded option for IP header...");
* rawSocket.SetSocketOption(socketLevel, SocketOptionName.HeaderIncluded, 1);
*
* try
* {
* // Send the packet!
* Console.WriteLine("Sending the packet...");
* int rc = rawSocket.SendTo(builtPacket, new IPEndPoint(destinationAddress, destinationPort));
* Console.WriteLine("send {0} bytes to {1}", rc, destinationAddress.ToString());
* }
* catch (SocketException err)
* {
* Console.WriteLine("Socket error occurred: {0}", err.Message);
* // http://msdn.microsoft.com/en-us/library/ms740668.aspx
* }
* finally
* {
* // Close the socket
* Console.WriteLine("Closing the socket...");
* rawSocket.Close();
* }
*/
return(builtPacket);
}
