ProxyHandler.java — netty Source File

Source Code

/*
 * Copyright 2014 The Netty Project
 *
 * The Netty Project 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:
 *
 *   https://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.netty.handler.proxy;

import io.netty.channel.Channel;
import io.netty.channel.ChannelDuplexHandler;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelPromise;
import io.netty.channel.PendingWriteQueue;
import io.netty.util.ReferenceCountUtil;
import io.netty.util.concurrent.DefaultPromise;
import io.netty.util.concurrent.EventExecutor;
import io.netty.util.concurrent.Future;
import io.netty.util.internal.ObjectUtil;
import io.netty.util.internal.logging.InternalLogger;
import io.netty.util.internal.logging.InternalLoggerFactory;

import java.net.SocketAddress;
import java.nio.channels.ConnectionPendingException;
import java.util.concurrent.TimeUnit;

/**
 * A common abstraction for protocols that establish blind forwarding proxy tunnels.
 */
public abstract class ProxyHandler extends ChannelDuplexHandler {

    private static final InternalLogger logger = InternalLoggerFactory.getInstance(ProxyHandler.class);

    /**
     * The default connect timeout: 10 seconds.
     */
    private static final long DEFAULT_CONNECT_TIMEOUT_MILLIS = 10000;

    /**
     * A string that signifies 'no authentication' or 'anonymous'.
     */
    static final String AUTH_NONE = "none";

    private final SocketAddress proxyAddress;
    private volatile SocketAddress destinationAddress;
    private volatile long connectTimeoutMillis = DEFAULT_CONNECT_TIMEOUT_MILLIS;

    private volatile ChannelHandlerContext ctx;
    private PendingWriteQueue pendingWrites;
    private boolean finished;
// ... (396 more lines)