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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 java.net.Socket;

/** proxyconn is glue between two Sockets wrapped in dataconn, to pss traffic between them. **/
class ProxyConn implements Runnable {

    public final boolean debug = false;
    protected Thread t;
    protected DataConn c1,  c2;

    public ProxyConn() {
    }

    public ProxyConn(DataConn _c1, DataConn _c2) {
        c1 = _c2;
        c2 = _c2;
    }

    public ProxyConn(Socket s1, Socket s2) {
        c1 = new DataConn(s1);
        c2 = new DataConn(s2);
    }

    public ProxyConn(Socket s1, String thost, int tport) {
        c1 = new DataConn(s1);
        c2 = new DataConn(thost, tport);
    }

    public void go() {
        c1.debug = debug;
        c1.debugname = "c1";
        c2.debug = debug;
        c2.debugname = "c2";
        t = new Thread(this);
        t.start();
    }

    protected void log(boolean fromc1, byte[] d) {
    }

    public void run() {
        while (dopolling()) {
        }
    }

    /* dopolling is called in run() loop. return false to close proxy connection **/
    protected boolean dopolling() {
        try {
            byte[] d;
            d = c1.read();
            if (d != null) {
                log(true, d);
                c2.write(d);
            }
            d = c2.read();
            if (d != null) {
                log(false, d);
                c1.write(d);
            }
            if (c1.error || c2.error) {
                return false;
            }
        } catch (Throwable T) {
            exception(T);
            return false;
        }
        return true;
    }

    protected void exception(Throwable T) {
        System.err.println("proxyconn ERR" + T.getMessage());
    }
}