c# how to send raw packets ?

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Hi,

How to send a message to this receiving function :

C#

Socket sok = new Socket(AddressFamily.InterNetwork,System.Net.Sockets.SocketType.Raw, ProtocolType.IP);
//Bind the socket to the selected IP address
sok.Bind(new IPEndPoint(IPAddress.Parse("192.168.1.21"), 6223));
//Set the socket  options
sok.SetSocketOption(SocketOptionLevel.IP,            //Applies only to IP packets
SocketOptionName.HeaderIncluded, //Set the include the header
                 true);          //option to true
byte[] byTrue = new byte[4] { 1, 0, 0, 0 };
byte[] byOut = new byte[4] { 1, 0, 0, 0 }; //Capture outgoing packets

//Socket.IOControl is analogous to the WSAIoctl method of Winsock 2
sok.IOControl(IOControlCode.ReceiveAll, byTrue, byOut); //Equivalent to SIO_RCVALL constant of Winsock 2
while (true)
{
    byte[] buffer = new byte[4096];
    int read = sok.Receive(buffer);
    if (read > 42)
    {
      if ((long)BitConverter.ToUInt32(buffer, 12) == (long)BitConverter.ToUInt32(buffer, 16))
      {
         Console.WriteLine(Encoding.ASCII.GetString(buffer, 40, read));
      }
     }
}

Posted 11-May-11 12:31pm

canard29

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Sandeep Mewara 12-May-11 1:39am

Elaborate!

1 solution

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Fredrik Bornander · Answer 1 · 2011-05-12T05:37:00

Broadcast something and it should be picked up by that code;
Working example:

C#

using System;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;
namespace SocketSample
{
    class Program
    {
        private static void Server()
        {
            try
            {
                Socket sok = new Socket(AddressFamily.InterNetwork, System.Net.Sockets.SocketType.Raw, ProtocolType.IP);
                sok.Bind(new IPEndPoint(IPAddress.Parse("10.201.170.106"), 6223));
                sok.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.HeaderIncluded, true);
                byte[] byTrue = new byte[4] { 1, 0, 0, 0 };
                byte[] byOut =  new byte[4] { 1, 0, 0, 0 }; 
                sok.IOControl(IOControlCode.ReceiveAll, byTrue, byOut); 
                int c = 0;
                while (++c < 40) // Only run for a little while
                {
                    byte[] buffer = new byte[4096];
                    int read = sok.Receive(buffer);
                    
                    for (int i = 0; i < buffer.Length; ++i)
                        Console.Write((char)buffer[i]);
                }
            }
            catch (Exception e)
            {
                Console.WriteLine(e.Message);
            }
        }
        private static void Client()
        {
            try
            {
                byte[] data = Encoding.ASCII.GetBytes("The quick red fox jumps over the lazy brown dog");
                Socket sendSocket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
                sendSocket.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.MulticastTimeToLive, 8);
                sendSocket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
                EndPoint sendEndPoint = new IPEndPoint(IPAddress.Parse("192.168.1.21"), 62508);
                sendSocket.SendTo(data, data.Length, SocketFlags.None, sendEndPoint);
                sendSocket.Close();
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
        }
        static void Main(string[] args)
        {
            Thread server = new Thread(Server);
            server.Start();
            Thread.Sleep(250); // Wait a while before sending;
            Thread client = new Thread(Client);
            client.Start();
            Console.ReadKey();
        }
    }
}

You probably will have to run it as administrator due to the way the socket is opened.

Hope this helps,
Fredrik Bornander