在我的C＃嗅探器中设置套接字选项时，不知道为什么我收到错误代码10022（无效参数）

Question

I'm writing a packet sniffer as an exercise in learning .Net 4 socket development on in C#. My goal is to sniff IP packets coming in and out out my computer.

My problem is that I'm getting error code 10022, invalid argument, on my call to SetSocketOption. I don't see where I have an invalid argument. I have some admin privs on my computer, but perhaps I don't have enough. It's my work computer and the IT department is pretty strict. With that said, if it was a permissions problem I would expect a different exception.

I'm not sure what my next step should be to debug this problem. Anyone have an idea?

Here's the code follows:

public Sniffer()
{
    try
    {
        socket = new Socket(
            AddressFamily.InterNetwork, SocketType.Raw, ProtocolType.IP);

        IPAddress[] ipAddresses = Dns.GetHostEntry(
            Dns.GetHostName()).AddressList;

        socket.Bind(new IPEndPoint(ipAddresses[0], 0));

        socket.SetSocketOption(
            SocketOptionLevel.IP, SocketOptionName.HeaderIncluded, true);

        byte[] inputData = new byte[4] { 1, 0, 0, 0 };
        byte[] outValue = new byte[4];

        socket.IOControl(IOControlCode.ReceiveAll, inputData, outValue);
    }
    catch (SocketException ex)
    {
        string ErrorMessage = ex.Message;
    }
}

Answer 1

Due to abuse by viruses in the early 2000's Microsoft has restricted the use of raw sockets on non server editions of the the windows OS on all OS's newer than XP SP2.

You can read more on what restrictions are in plance from the page on TCP/IP Raw Sockets on the MSDN.

Answer 2

WSAEINVAL 10022

Invalid argument.

Some invalid argument was supplied (for example, specifying an invalid level to the setsockopt function). In some instances, it also refers to the current state of the socket—for instance, calling accept on a socket that is not listening.

Take a look about this error here: http://msdn.microsoft.com/en-us/library/ms740668(v=vs.85).aspx