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Java example source code file (SocksServerHandler.java)

This example Java source code file (SocksServerHandler.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

instance, override, simplechannelinboundhandler, socks4a, socks4commandrequest, socks5commandrequest, socks5commandrequestdecoder, socks5initialrequest, socks5passwordauthrequest, socksmessage, socksserverconnecthandler, socksserverhandler, throwable, unknown

The SocksServerHandler.java Java example source code

/*
 * Copyright 2012 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:
 *
 *   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.netty.example.socksproxy;

import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.handler.codec.socksx.SocksMessage;
import io.netty.handler.codec.socksx.v4.Socks4CommandRequest;
import io.netty.handler.codec.socksx.v4.Socks4CommandType;
import io.netty.handler.codec.socksx.v5.DefaultSocks5InitialResponse;
import io.netty.handler.codec.socksx.v5.DefaultSocks5PasswordAuthResponse;
import io.netty.handler.codec.socksx.v5.Socks5AuthMethod;
import io.netty.handler.codec.socksx.v5.Socks5InitialRequest;
import io.netty.handler.codec.socksx.v5.Socks5CommandRequest;
import io.netty.handler.codec.socksx.v5.Socks5CommandRequestDecoder;
import io.netty.handler.codec.socksx.v5.Socks5CommandType;
import io.netty.handler.codec.socksx.v5.Socks5PasswordAuthRequest;
import io.netty.handler.codec.socksx.v5.Socks5PasswordAuthStatus;

@ChannelHandler.Sharable
public final class SocksServerHandler extends SimpleChannelInboundHandler<SocksMessage> {

    public static final SocksServerHandler INSTANCE = new SocksServerHandler();

    private SocksServerHandler() { }

    @Override
    public void channelRead0(ChannelHandlerContext ctx, SocksMessage socksRequest) throws Exception {
        switch (socksRequest.version()) {
            case SOCKS4a:
                Socks4CommandRequest socksV4CmdRequest = (Socks4CommandRequest) socksRequest;
                if (socksV4CmdRequest.type() == Socks4CommandType.CONNECT) {
                    ctx.pipeline().addLast(new SocksServerConnectHandler());
                    ctx.pipeline().remove(this);
                    ctx.fireChannelRead(socksRequest);
                } else {
                    ctx.close();
                }
                break;
            case SOCKS5:
                if (socksRequest instanceof Socks5InitialRequest) {
                    // auth support example
                    //ctx.pipeline().addFirst(new Socks5PasswordAuthRequestDecoder());
                    //ctx.write(new DefaultSocks5AuthMethodResponse(Socks5AuthMethod.PASSWORD));
                    ctx.pipeline().addFirst(new Socks5CommandRequestDecoder());
                    ctx.write(new DefaultSocks5InitialResponse(Socks5AuthMethod.NO_AUTH));
                } else if (socksRequest instanceof Socks5PasswordAuthRequest) {
                    ctx.pipeline().addFirst(new Socks5CommandRequestDecoder());
                    ctx.write(new DefaultSocks5PasswordAuthResponse(Socks5PasswordAuthStatus.SUCCESS));
                } else if (socksRequest instanceof Socks5CommandRequest) {
                    Socks5CommandRequest socks5CmdRequest = (Socks5CommandRequest) socksRequest;
                    if (socks5CmdRequest.type() == Socks5CommandType.CONNECT) {
                        ctx.pipeline().addLast(new SocksServerConnectHandler());
                        ctx.pipeline().remove(this);
                        ctx.fireChannelRead(socksRequest);
                    } else {
                        ctx.close();
                    }
                } else {
                    ctx.close();
                }
                break;
            case UNKNOWN:
                ctx.close();
                break;
        }
    }

    @Override
    public void channelReadComplete(ChannelHandlerContext ctx) {
        ctx.flush();
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable throwable) {
        throwable.printStackTrace();
        SocksServerUtils.closeOnFlush(ctx.channel());
    }
}

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