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The Netty project is an effort to provide an asynchronous event-driven network application framework and tools for rapid development of maintainable high performance and high scalability protocol servers and clients. In other words, Netty is a NIO client server framework which enables quick and easy development of network applications such as protocol servers and clients. It greatly simplifies and streamlines network programming such as TCP and UDP socket server.

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/*
 * 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.bootstrap.Bootstrap;
import io.netty.channel.Channel;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundMessageHandlerAdapter;
import io.netty.channel.ChannelOption;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.codec.socks.SocksCmdRequest;
import io.netty.codec.socks.SocksCmdResponse;
import io.netty.codec.socks.SocksMessage;


@ChannelHandler.Sharable
public final class SocksServerConnectHandler extends ChannelInboundMessageHandlerAdapter {
    private static final String name = "SOCKS_SERVER_CONNECT_HANDLER";

    public static String getName() {
        return name;
    }

    private final Bootstrap b;

    public SocksServerConnectHandler() {
        super(SocksCmdRequest.class);
        b = new Bootstrap();
    }

    @Override
    public void messageReceived(final ChannelHandlerContext ctx, final SocksCmdRequest request) throws Exception {
        CallbackNotifier cb = new CallbackNotifier() {
            @Override
            public void onSuccess(final ChannelHandlerContext outboundCtx) {
                ctx.channel().write(new SocksCmdResponse(SocksMessage.CmdStatus.SUCCESS, request.getAddressType()))
                             .addListener(new ChannelFutureListener() {
                    @Override
                    public void operationComplete(ChannelFuture channelFuture) throws Exception {
                        ctx.pipeline().remove(getName());
                        outboundCtx.channel().pipeline().addLast(new RelayHandler(ctx.channel()));
                        ctx.channel().pipeline().addLast(new RelayHandler(outboundCtx.channel()));
                    }
                });
            }

            @Override
            public void onFailure(ChannelHandlerContext outboundCtx, Throwable cause) {
                ctx.channel().write(new SocksCmdResponse(SocksMessage.CmdStatus.FAILURE, request.getAddressType()));
                SocksServerUtils.closeOnFlush(ctx.channel());
            }
        };

        final Channel inboundChannel = ctx.channel();
        b.group(inboundChannel.eventLoop())
                .channel(NioSocketChannel.class)
                .option(ChannelOption.CONNECT_TIMEOUT_MILLIS, 10000)
                .option(ChannelOption.SO_KEEPALIVE, true)
                .handler(new DirectClientInitializer(cb))
                .remoteAddress(request.getHost(), request.getPort());
        b.connect();
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
        SocksServerUtils.closeOnFlush(ctx.channel());
    }
}