interfacethread.java

Security Java Chat. This is security simple console chat written in java.

package sjc;

import java.io.*;
import java.net.*;
import javax.net.*;
import javax.net.ssl.*;

public class InterfaceThread extends Thread {
	public InterfaceThread(ManagerThread mt) {
		mthread = mt;
	}
	private BufferedReader console = null;
	private ManagerThread mthread = null;

	private ObjectQueue queue = new ObjectQueue();
	public ObjectQueue getQueue() {
		return queue;
	}
	public void run() {
		initConsole();
		askForConnect();
		while (!isInterrupted()) {
			proceed(queue.get());
		}
	}

	private void initConsole() {
		console = new BufferedReader(new InputStreamReader(System.in));
	}
	private void askForConnect() {
		try {
			boolean correct = false;
			while (!correct) {
				System.out.print("Connect to another host (Y) or listen for connections (N)?");
				System.out.flush();
				char yn = (console.readLine() + " ").charAt(0); /*the " " is a bugfix in case someone just presses enter */
				/* it is faster to chack both uppercase and lowercase than to use toLowerCase() method */
				if (yn == 'y' || yn == 'Y') {
					mthread.getQueue().put(ManagerThread.YES);
					correct = true;
				} else if (yn == 'n' || yn == 'N') {
					mthread.getQueue().put(ManagerThread.NO);
					correct = true;
				} else {
					System.out.println("Please enter a Y or N");
				}
			}
		} catch (IOException e) {
		}
	}

	private void proceed(Object obj) {
		try {
			if (obj == ManagerThread.CONNECT) {
				boolean correct = false;
				InetAddress addr = null;
				while (!correct) {
					System.out.print("IP Address or Hostname:");
					System.out.flush();
					String ipaddr = console.readLine();
					if (ipaddr == "") {
						System.out.println("Please enter an IP Address or a Hostname");
					} else {
						try {
							addr=InetAddress.getByName(ipaddr);
							SSLSocket sslsock = (SSLSocket) SSLSocketFactory.getDefault().createSocket(addr, 40000);
							sslsock.setEnabledCipherSuites(new String[] {"SSL_DH_anon_WITH_3DES_EDE_CBC_SHA"/* "SSL_DH_anon_WITH_RC4_128_MD5" */});
							System.out.println("Connection successful");
							mthread.getQueue().put(sslsock);
							correct = true;
						} catch (UnknownHostException e) {
							System.out.println("Please enter a valid IP Address or Hostname");
						} catch (IOException e) {
							System.out.println("Error connecting to host: Host might not be online");
						}
					}
				}
			} else if (obj instanceof SSLSocket) {
				SSLSocket socket =(SSLSocket) obj;
				ConsoleWriteThread toHost = new ConsoleWriteThread(System.in, socket.getOutputStream());
				InetReadThread fromHost = new InetReadThread(socket.getInputStream(), System.out);
				fromHost.start();
				toHost.start();
				System.out.println("Chat connection established");
			}
		} catch (IOException e) {
			e.printStackTrace();
			System.out.println("Connection terminated");
			System.out.println("Press <enter> to exit");
			try {
				console.readLine();
			} catch (IOException ex) {
			}
			System.exit(0);
		}
	}
}