// Timed at taking 8.5 sec for 10,000 ports
import java.io.*;
import java.net.*;
public class ProbeServer {

    public static void main(String[] args)
    {
	// Check input parameters
	if (args.length != 3) {
	    System.out.println("Usage: java ProbeServer <server> "
			       + "<start-port> <end-port>");
	    return;
	}
	
	String serverName = args[0];
	int startPort = Integer.parseInt(args[1]);
	int endPort = Integer.parseInt(args[2]);
	
	InetAddress ip = null;
	try {
	    ip = InetAddress.getByName(serverName);
	}
	catch (Exception e) {
	    System.out.println("Unable to get details for " 
			       + serverName + ", " + e);
	    return;
	}
	
	System.out.println("Probing " + serverName + " between ports " 
			   + startPort + " and " + endPort);

	for (int port=startPort; port<endPort; port++) {
	    try {
		// Try and connect socket to this port
		Socket s = new Socket(ip,port);
		System.out.println(serverName + " is listening on port " 
				   + port);
	    }
	    catch (IOException e) {
		// weren't able to connect on this port
	    }
	}
	
	System.out.println();
	System.out.println("Probe complete");
	
    }
}