import java.net.*;
import java.io.*;

/**
 * Telnet - connect to a given host and service
 * This does not hold a candle to a real Telnet client, but
 * shows some ideas on how to implement such a thing.
 * @version $Id: Telnet.java,v 1.8 2001/04/28 23:36:03 ian Exp $
 */
public class Telnet {
	String host;
	int portNum;
	public static void main(String[] argv) {
		new Telnet().talkTo(argv);
	}
	private void talkTo(String av[]) {
		if (av.length >= 1)
			host = av[0];
		else
			host = "localhost";
		if (av.length >= 2)
			portNum = Integer.parseInt(av[1]);
		else portNum = 23;
		System.out.println("Host " + host + "; port " + portNum);
		try {
			Socket s = new Socket(host, portNum);

			// Connect the remote to our stdout
			new Pipe(s.getInputStream(), System.out).start();

			// Connect our stdin to the remote
			new Pipe(System.in, s.getOutputStream()).start();

		} catch(IOException e) {
			System.out.println(e);
			return;
		}
		System.out.println("Connected OK");
	}
}

/** This class handles one side of the connection. */
/* This class handles one half of a full-duplex connection.
 * Line-at-a-time mode. Streams, not writers, are used.
 */
class Pipe extends Thread {
	DataInputStream is;
	PrintStream os;

	// Constructor
	Pipe(InputStream is, OutputStream os) {
		this.is = new DataInputStream(is);
		this.os = new PrintStream(os);
	}

	// Do something method
	public void run() {
		String line;
		try {
			while ((line = is.readLine()) != null) {
				os.print(line);
				os.print("\r\n");
				os.flush();
			}
		} catch(IOException e) {
			throw new RuntimeException(e.getMessage());
		}
	}
}