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1   /*
2    * Copyright 2012 The Netty Project
3    *
4    * The Netty Project licenses this file to you under the Apache License,
5    * version 2.0 (the "License"); you may not use this file except in compliance
6    * with the License. You may obtain a copy of the License at:
7    *
8    *   http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13   * License for the specific language governing permissions and limitations
14   * under the License.
15   */
16  package io.netty.example.socksproxy;
17  
18  import io.netty.buffer.Unpooled;
19  import io.netty.channel.Channel;
20  import io.netty.channel.ChannelHandlerAdapter;
21  import io.netty.channel.ChannelHandlerContext;
22  import io.netty.util.ReferenceCountUtil;
23  
24  
25  public final class RelayHandler extends ChannelHandlerAdapter {
26  
27      private final Channel relayChannel;
28  
29      public RelayHandler(Channel relayChannel) {
30          this.relayChannel = relayChannel;
31      }
32  
33      @Override
34      public void channelActive(ChannelHandlerContext ctx) {
35          ctx.writeAndFlush(Unpooled.EMPTY_BUFFER);
36      }
37  
38      @Override
39      public void channelRead(ChannelHandlerContext ctx, Object msg) {
40          if (relayChannel.isActive()) {
41              relayChannel.writeAndFlush(msg);
42          } else {
43              ReferenceCountUtil.release(msg);
44          }
45      }
46  
47      @Override
48      public void channelInactive(ChannelHandlerContext ctx) {
49          if (relayChannel.isActive()) {
50              SocksServerUtils.closeOnFlush(relayChannel);
51          }
52      }
53  
54      @Override
55      public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
56          cause.printStackTrace();
57          ctx.close();
58      }
59  }