Can't Listen to Port 80

**globalarchitect** · March 8th, 2010 02:11 PM

I am attempting to create a socket listener in a Windows application using a System.Net.Sockets.Socket but I could not bind to port 80 on my Windows 7 machine, I could bind to any other port without issue but attempting to bind to 80 always resulted in:

an attempt was made to access a socket in a way forbidden by its access permissions

I discovered that IIS running locally locked up port 80 and that I had to move IIS to another port - you can read how to d os by going to http://www.ultimateproxylist.com/ChangingIIS.aspx

The problem I still have - even after moving IIS off of Port 80 - is that no listener is actually working. I even grabbed the following code sample directly off the MSDN site and even IT does not work! I am on a Windows 7 machine - any ideas?!?

if (!HttpListener.IsSupported)
{
Console.WriteLine("Windows XP SP2 or Server 2003 is required to use the HttpListener class.");
return;
}

// Create a listener.
HttpListener listener = new HttpListener();

// Add the prefixes.
listener.Prefixes.Add("http://*:80/");
listener.Start();
Console.WriteLine("Listening...");
// Note: The GetContext method blocks while waiting for a request.
HttpListenerContext context = listener.GetContext();
HttpListenerRequest request = context.Request;
// Obtain a response object.
HttpListenerResponse response = context.Response;
// Construct a response.
string responseString = "<HTML><BODY> Hello world!</BODY></HTML>";
byte[] buffer = System.Text.Encoding.UTF8.GetBytes(responseString);
// Get a response stream and write the response to it.
response.ContentLength64 = buffer.Length;
System.IO.Stream output = response.OutputStream;
output.Write(buffer, 0, buffer.Length);
// You must close the output stream.
output.Close();
listener.Stop();

**SonOfMyMom** · March 9th, 2010 05:24 AM

I have another approach which works for me to sniff a network

Code:

                string ip1 = @"127.0.0.1";
                socket = new Socket(AddressFamily.InterNetwork, SocketType.Raw, ProtocolType.IP);
                byte[] buffer = new byte[2048];
                //SocketPair socketpair = new SocketPair(socket, buffer);
                //socket.Blocking = true;
                socket.Bind(new IPEndPoint(IPAddress.Parse(ip1), 80));
                socket.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.HeaderIncluded, true);
                byte[] IN = new byte[4] { 1, 0, 0, 0 };
                byte[] OUT = new byte[4];

                int ret_code = socket.IOControl(IOControlCode.ReceiveAll, IN, OUT);

                ret_code = OUT[0] + OUT[1] + OUT[2] + OUT[3];
                //if (ret_code != 0)
                //    ret_val = false;

                socket.BeginReceive(byteData, 0, byteData.Length, SocketFlags.None, new AsyncCallback(Onreceive), null);

....

**globalarchitect** · March 9th, 2010 07:37 AM

Thank you for your code sample - I am testing it out now. When I get to the following line:

int ret_code = socket.IOControl(IOControlCode.ReceiveAll, IN, OUT);

I get an invalid argument (10022) socket exception. Any ideas on why that does not work?

**SonOfMyMom** · March 10th, 2010 02:13 AM

the IP is not valid ...use ipconfig and assign a valid IP....

**globalarchitect** · March 10th, 2010 06:56 AM

As it turns out, it was the byte[] IN array that was thei ssue - here is the correct code:

Code:

mainSocket = new Socket(AddressFamily.InterNetwork,
                        SocketType.Raw, ProtocolType.IP);

            //Bind the socket to the selected IP address
            mainSocket.Bind(new IPEndPoint(IPAddress.Parse("192.168.1.7"), 80));

            //Set the socket  options
            mainSocket.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
            mainSocket.IOControl(IOControlCode.ReceiveAll,              //Equivalent to SIO_RCVALL constant
                //of Winsock 2
                                 byTrue,
                                 byOut);

            //Start receiving the packets asynchronously
            mainSocket.BeginReceive(byteData, 0, byteData.Length, SocketFlags.None,
                new AsyncCallback(OnReceive), null);

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