Socks4ProxyHandler.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.ChannelHandlerContext;
import io.netty.channel.ChannelPipeline;
import io.netty.handler.codec.socksx.v4.DefaultSocks4CommandRequest;
import io.netty.handler.codec.socksx.v4.Socks4ClientDecoder;
import io.netty.handler.codec.socksx.v4.Socks4ClientEncoder;
import io.netty.handler.codec.socksx.v4.Socks4CommandResponse;
import io.netty.handler.codec.socksx.v4.Socks4CommandStatus;
import io.netty.handler.codec.socksx.v4.Socks4CommandType;

import java.net.InetSocketAddress;
import java.net.SocketAddress;

/**
 * Handler that establishes a blind forwarding proxy tunnel using
 * <a href="https://www.openssh.com/txt/socks4.protocol">SOCKS4</a> protocol.
 */
public final class Socks4ProxyHandler extends ProxyHandler {

    private static final String PROTOCOL = "socks4";
    private static final String AUTH_USERNAME = "username";

    private final String username;

    private String decoderName;
    private String encoderName;

    public Socks4ProxyHandler(SocketAddress proxyAddress) {
        this(proxyAddress, null);
    }

    public Socks4ProxyHandler(SocketAddress proxyAddress, String username) {
        super(proxyAddress);
        if (username != null && username.isEmpty()) {
            username = null;
        }
        this.username = username;
    }

    @Override
    public String protocol() {
        return PROTOCOL;
    }
// ... (61 more lines)