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How to listen on a single IP Address?

Posted on 2008-06-19
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Last Modified: 2010-05-18
Hi,

I try to write a window form, that can connect to a server (here: a web server) and send information to it.

But I have problems by receiving data from the server.
I could listen on every incoming address (port 80) but that would mean that also streams of the web browser I use at that moment would be received.

So I just want to receive data from one special address.

But I get an error:
The selected IP address is not valid in this context.

Is there any way to listen on single addresses?
(the server is my own at home and firewall settings are made)
class Tranmission
 {
  private IPAddress targetAddress;
  private IPEndPoint endpoint;
  public Tranmission()
  {
   targetAddress = IPAddress.Parse("213.211.224.32");
   endpoint = new IPEndPoint(targetAddress, 80);
  }
 
  public string listen()
  {
   string result = null;
   TcpListener listener = new TcpListener(endpoint);
   try
   {
    listener.Start();
    TcpClient client = listener.AcceptTcpClient();
    StreamReader inStream = new StreamReader(client.GetStream());
    result = inStream.ReadToEnd();
    client.Close();
    listener.Stop();
   }
   catch (SocketException ex)
   {
    MessageBox.Show(ex.ToString());
   }
   catch (StackOverflowException ex)
   {
    MessageBox.Show(ex.ToString());
   }
   return result;
  }
 
  public bool sendText(string text)
  {
   int i=0;
   do
   {
    try
    {
     TcpClient client = new TcpClient("www.gruenzeuch.de", 80);
     StreamWriter outStream = new StreamWriter(client.GetStream());
     outStream.WriteLine(text);
     outStream.Close();
     return true;
    }
    catch (SocketException ex)
    {
     i++;
    }
   }while(i<10);
   return false;
  }
 }

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Question by:develc
  • 2
3 Comments
 
LVL 17

Expert Comment

by:Andres Perales
ID: 21826334
In your IIS setting you have to specifiy the IP address for that webserver to listen on...if you are using host headers this will not work...
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LVL 1

Author Comment

by:develc
ID: 21826484
it is no Web-Application, it's a window form.
Yesterday I wrote a small listener, who listend on any address and it worked.
But that's not really what I want.
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LVL 1

Accepted Solution

by:
develc earned 0 total points
ID: 21998459
After a long series of tries, I found the solution:


 public string listen(string targetIPAddress, int port)
  {
   string result = null;
   string[] target = targetIPAddress.Split('.');

   Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);

   try
   {
    IPAddress address = IPAddress.Parse(targetIPAddress);
    IPEndPoint endpoint = new IPEndPoint(address, port);
    socket.Connect(endpoint);
    socket.Listen(1000);

    Socket clientSocket = socket.Accept();
    byte[] data = new byte[1024];

    int receivedLength = clientSocket.Receive(data);

    result = Encoding.UTF8.GetString(data);

    clientSocket.Close();
    socket.Close();

    return result;
   }
   catch(SocketException ex)
   {
    MessageBox.Show(ex.Message);
    return null;
   }
  }
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