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Milton Community Edition: Supports DAV level 1 and is available on Apache2 license
There is a newer version: 4.0.3.2215
/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package io.milton.proxy;

import io.milton.common.Service;
import java.net.ServerSocket;
import java.net.Socket;

/** proxyserver listens on given lport, forwards traffic to tport on thost **/
public class ProxyServer implements Runnable, Service {
    private boolean debug = false;
    private int targetPort;
    private int listenPort;
    private String targetHost;
    protected Thread thread;
    private boolean running;

    public ProxyServer() {
    }


    public ProxyServer(String targetHost, int targetPort, int listenPort) {
        this.targetHost = targetHost;
        this.targetPort = targetPort;
        this.listenPort = listenPort;
    }

    public void go() {
        running = true;
        thread = new Thread(this);
        thread.start();
    }

    public void run() {
        System.out.println("starting listening on: " + listenPort);
        try {
            ServerSocket ss = new ServerSocket(listenPort);
            if (debug) {
                System.err.println("proxyserver: " + listenPort + " listening");
            }
            while (running) {
                Socket sconn = ss.accept();
                if (debug) {
                    System.err.print(" gotConn: " + listenPort + " ");
                }
                gotconn(sconn);
            }
        } catch (Throwable e) {
            if (debug) {
                System.err.println("proxyserver: " + listenPort + " " + e.toString());
            }
            e.printStackTrace();
        }
    }

    protected void gotconn(Socket sconn) throws Exception {
        ProxyConn pc = new ProxyConn(sconn, targetHost, targetPort);
        pc.go();
    }

    public static void main(String[] args) {
        String targetHost = args[0];
        Integer targetPort = new Integer(args[1]);
        Integer listenPort = new Integer(args[2]);
        ProxyServer us = new ProxyServer(targetHost, targetPort, listenPort);
        us.go();
    }

    public void start() {
        go();
    }

    public void stop() {
        thread.interrupt();
    }

    /**
     * @return the debug
     */
    public boolean isDebug() {
        return debug;
    }

    /**
     * @param debug the debug to set
     */
    public void setDebug(boolean debug) {
        this.debug = debug;
    }

    /**
     * @return the targetPort
     */
    public int getTargetPort() {
        return targetPort;
    }

    /**
     * @param targetPort the targetPort to set
     */
    public void setTargetPort(int targetPort) {
        this.targetPort = targetPort;
    }

    /**
     * @return the listenPort
     */
    public int getListenPort() {
        return listenPort;
    }

    /**
     * @param listenPort the listenPort to set
     */
    public void setListenPort(int listenPort) {
        this.listenPort = listenPort;
    }

    /**
     * @return the targetHost
     */
    public String getTargetHost() {
        return targetHost;
    }

    /**
     * @param targetHost the targetHost to set
     */
    public void setTargetHost(String targetHost) {
        this.targetHost = targetHost;
    }
    

}