pers.zlf.sslocal.handler.socks.SocksServerHandler.java Source code

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Here is the source code for pers.zlf.sslocal.handler.socks.SocksServerHandler.java

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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 pers.zlf.sslocal.handler.socks;

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

import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.handler.codec.socks.SocksAuthResponse;
import io.netty.handler.codec.socks.SocksAuthScheme;
import io.netty.handler.codec.socks.SocksAuthStatus;
import io.netty.handler.codec.socks.SocksCmdRequest;
import io.netty.handler.codec.socks.SocksCmdRequestDecoder;
import io.netty.handler.codec.socks.SocksCmdType;
import io.netty.handler.codec.socks.SocksInitResponse;
import io.netty.handler.codec.socks.SocksRequest;
import pers.zlf.sslocal.handler.shadowsocks.ShadowsocksServerConnectHandler;
import pers.zlf.sslocal.utils.ChannelUtils;

@ChannelHandler.Sharable
public final class SocksServerHandler extends SimpleChannelInboundHandler<SocksRequest> {
    private Logger logger = LoggerFactory.getLogger(SocksServerHandler.class);

    @Override
    public void channelRead0(ChannelHandlerContext ctx, SocksRequest socksRequest) throws Exception {
        switch (socksRequest.requestType()) {
        case INIT: {
            ctx.pipeline().addFirst(new SocksCmdRequestDecoder());
            ctx.write(new SocksInitResponse(SocksAuthScheme.NO_AUTH));
            break;
        }
        case AUTH:
            ctx.pipeline().addFirst(new SocksCmdRequestDecoder());
            ctx.write(new SocksAuthResponse(SocksAuthStatus.SUCCESS));
            break;
        case CMD:
            SocksCmdRequest req = (SocksCmdRequest) socksRequest;
            if (req.cmdType() == SocksCmdType.CONNECT) {
                ctx.pipeline().addLast(new ShadowsocksServerConnectHandler());
                ctx.pipeline().remove(this);
                ctx.fireChannelRead(socksRequest);
            } 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) {
        logger.error("Exception caught on channel {}", ctx.channel(), throwable);
        ChannelUtils.closeOnFlush(ctx.channel());
    }
}