94 lines
4.1 KiB
Java
94 lines
4.1 KiB
Java
/*
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* Copyright 2012 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.example.socksproxy;
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import io.netty.channel.ChannelHandler;
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import io.netty.channel.ChannelHandlerContext;
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import io.netty.channel.SimpleChannelInboundHandler;
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import io.netty.handler.codec.socksx.SocksMessage;
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import io.netty.handler.codec.socksx.v4.Socks4CommandRequest;
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import io.netty.handler.codec.socksx.v4.Socks4CommandType;
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import io.netty.handler.codec.socksx.v5.DefaultSocks5InitialResponse;
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import io.netty.handler.codec.socksx.v5.DefaultSocks5PasswordAuthResponse;
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import io.netty.handler.codec.socksx.v5.Socks5AuthMethod;
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import io.netty.handler.codec.socksx.v5.Socks5InitialRequest;
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import io.netty.handler.codec.socksx.v5.Socks5CommandRequest;
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import io.netty.handler.codec.socksx.v5.Socks5CommandRequestDecoder;
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import io.netty.handler.codec.socksx.v5.Socks5CommandType;
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import io.netty.handler.codec.socksx.v5.Socks5PasswordAuthRequest;
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import io.netty.handler.codec.socksx.v5.Socks5PasswordAuthStatus;
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@ChannelHandler.Sharable
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public final class SocksServerHandler extends SimpleChannelInboundHandler<SocksMessage> {
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public static final SocksServerHandler INSTANCE = new SocksServerHandler();
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private SocksServerHandler() { }
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@Override
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public void messageReceived(ChannelHandlerContext ctx, SocksMessage socksRequest) throws Exception {
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switch (socksRequest.version()) {
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case SOCKS4a:
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Socks4CommandRequest socksV4CmdRequest = (Socks4CommandRequest) socksRequest;
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if (socksV4CmdRequest.type() == Socks4CommandType.CONNECT) {
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ctx.pipeline().addLast(new SocksServerConnectHandler());
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ctx.fireChannelRead(socksRequest);
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ctx.pipeline().remove(this);
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} else {
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ctx.close();
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}
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break;
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case SOCKS5:
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if (socksRequest instanceof Socks5InitialRequest) {
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// auth support example
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//ctx.pipeline().addFirst(new Socks5PasswordAuthRequestDecoder());
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//ctx.write(new DefaultSocks5AuthMethodResponse(Socks5AuthMethod.PASSWORD));
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ctx.pipeline().addFirst(new Socks5CommandRequestDecoder());
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ctx.write(new DefaultSocks5InitialResponse(Socks5AuthMethod.NO_AUTH));
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} else if (socksRequest instanceof Socks5PasswordAuthRequest) {
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ctx.pipeline().addFirst(new Socks5CommandRequestDecoder());
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ctx.write(new DefaultSocks5PasswordAuthResponse(Socks5PasswordAuthStatus.SUCCESS));
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} else if (socksRequest instanceof Socks5CommandRequest) {
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Socks5CommandRequest socks5CmdRequest = (Socks5CommandRequest) socksRequest;
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if (socks5CmdRequest.type() == Socks5CommandType.CONNECT) {
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ctx.pipeline().addLast(new SocksServerConnectHandler());
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ctx.fireChannelRead(socksRequest);
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ctx.pipeline().remove(this);
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} else {
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ctx.close();
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}
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} else {
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ctx.close();
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}
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break;
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case UNKNOWN:
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ctx.close();
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break;
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}
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}
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@Override
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public void channelReadComplete(ChannelHandlerContext ctx) {
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ctx.flush();
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}
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@Override
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public void exceptionCaught(ChannelHandlerContext ctx, Throwable throwable) {
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throwable.printStackTrace();
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SocksServerUtils.closeOnFlush(ctx.channel());
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}
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}
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