pers.zlf.fhsp.socks.RelayHandler.java Source code

Introduction

Here is the source code for pers.zlf.fhsp.socks.RelayHandler.java

Source

/*
 * 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 pers.zlf.fhsp.socks;

import java.net.InetSocketAddress;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import io.netty.buffer.Unpooled;
import io.netty.channel.Channel;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.util.ReferenceCountUtil;
import pers.zlf.fhsp.config.Configuration;
import pers.zlf.fhsp.splitter.ByteBufSplitter;

public final class RelayHandler extends ChannelInboundHandlerAdapter {
    private static final Logger LOGGER = LoggerFactory.getLogger(RelayHandler.class);
    private static final ByteBufSplitter SPLITTER = Configuration.splitter();

    private final Channel relayChannel;

    public RelayHandler(Channel relayChannel) {
        this.relayChannel = relayChannel;
    }

    @Override
    public void handlerAdded(ChannelHandlerContext ctx) throws Exception {
        // Split plaintext transferred within HTTP only
        if (((InetSocketAddress) relayChannel.remoteAddress()).getPort() == 80) {
            ctx.pipeline().addBefore(ctx.name(), ByteBufSplitter.class.getName(), SPLITTER);
        }
    }

    @Override
    public void channelActive(ChannelHandlerContext ctx) {
        ctx.writeAndFlush(Unpooled.EMPTY_BUFFER);
    }

    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) {
        if (relayChannel.isActive()) {
            relayChannel.writeAndFlush(msg);
        } else {
            ReferenceCountUtil.release(msg);
        }
    }

    @Override
    public void channelInactive(ChannelHandlerContext ctx) {
        if (relayChannel.isActive()) {
            SocksServerUtils.closeOnFlush(relayChannel);
        }
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
        if (LOGGER.isErrorEnabled()) {
            LOGGER.error("Exception caught", cause);
        }
        ctx.close();
    }
}