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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.telnet;
17  
18  import io.netty.bootstrap.ServerBootstrap;
19  import io.netty.channel.EventLoopGroup;
20  import io.netty.channel.nio.NioEventLoopGroup;
21  import io.netty.channel.socket.nio.NioServerSocketChannel;
22  import io.netty.handler.logging.LogLevel;
23  import io.netty.handler.logging.LoggingHandler;
24  import io.netty.handler.ssl.SslContext;
25  import io.netty.handler.ssl.SslContextBuilder;
26  import io.netty.handler.ssl.util.SelfSignedCertificate;
27  
28  /**
29   * Simplistic telnet server.
30   */
31  public final class TelnetServer {
32  
33      static final boolean SSL = System.getProperty("ssl") != null;
34      static final int PORT = Integer.parseInt(System.getProperty("port", SSL? "8992" : "8023"));
35  
36      public static void main(String[] args) throws Exception {
37          // Configure SSL.
38          final SslContext sslCtx;
39          if (SSL) {
40              SelfSignedCertificate ssc = new SelfSignedCertificate();
41              sslCtx = SslContextBuilder.forServer(ssc.certificate(), ssc.privateKey()).build();
42          } else {
43              sslCtx = null;
44          }
45  
46          EventLoopGroup bossGroup = new NioEventLoopGroup(1);
47          EventLoopGroup workerGroup = new NioEventLoopGroup();
48          try {
49              ServerBootstrap b = new ServerBootstrap();
50              b.group(bossGroup, workerGroup)
51               .channel(NioServerSocketChannel.class)
52               .handler(new LoggingHandler(LogLevel.INFO))
53               .childHandler(new TelnetServerInitializer(sslCtx));
54  
55              b.bind(PORT).sync().channel().closeFuture().sync();
56          } finally {
57              bossGroup.shutdownGracefully();
58              workerGroup.shutdownGracefully();
59          }
60      }
61  }