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1   /*
2    * Copyright 2014 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.channel.epoll;
17  
18  import io.netty.channel.Channel;
19  import io.netty.channel.EventLoop;
20  import io.netty.channel.socket.ServerSocketChannel;
21  import io.netty.channel.unix.FileDescriptor;
22  import io.netty.channel.unix.Socket;
23  
24  import java.io.IOException;
25  import java.net.InetAddress;
26  import java.net.InetSocketAddress;
27  import java.net.SocketAddress;
28  import java.util.Collection;
29  import java.util.Collections;
30  import java.util.Map;
31  
32  import static io.netty.channel.unix.NativeInetAddress.address;
33  import static io.netty.channel.unix.Socket.newSocketStream;
34  
35  /**
36   * {@link ServerSocketChannel} implementation that uses linux EPOLL Edge-Triggered Mode for
37   * maximal performance.
38   */
39  public final class EpollServerSocketChannel extends AbstractEpollServerChannel implements ServerSocketChannel {
40  
41      private final EpollServerSocketChannelConfig config;
42      private volatile Collection<InetAddress> tcpMd5SigAddresses = Collections.emptyList();
43  
44      public EpollServerSocketChannel() {
45          super(newSocketStream(), false);
46          config = new EpollServerSocketChannelConfig(this);
47      }
48  
49      /**
50       * @deprecated Use {@link #EpollServerSocketChannel(Socket, boolean)}.
51       * Creates a new {@link EpollServerSocketChannel} from an existing {@link FileDescriptor}.
52       */
53      @Deprecated
54      public EpollServerSocketChannel(FileDescriptor fd) {
55          // Must call this constructor to ensure this object's local address is configured correctly.
56          // The local address can only be obtained from a Socket object.
57          this(new Socket(fd.intValue()));
58      }
59  
60      /**
61       * @deprecated Use {@link #EpollServerSocketChannel(Socket, boolean)}.
62       * Creates a new {@link EpollServerSocketChannel} from an existing {@link Socket}.
63       */
64      @Deprecated
65      public EpollServerSocketChannel(Socket fd) {
66          super(fd);
67          config = new EpollServerSocketChannelConfig(this);
68      }
69  
70      public EpollServerSocketChannel(Socket fd, boolean active) {
71          super(fd, active);
72          config = new EpollServerSocketChannelConfig(this);
73      }
74  
75      @Override
76      protected boolean isCompatible(EventLoop loop) {
77          return loop instanceof EpollEventLoop;
78      }
79  
80      @Override
81      protected void doBind(SocketAddress localAddress) throws Exception {
82          super.doBind(localAddress);
83          if (Native.IS_SUPPORTING_TCP_FASTOPEN && config.getTcpFastopen() > 0) {
84              Native.setTcpFastopen(fd().intValue(), config.getTcpFastopen());
85          }
86          fd().listen(config.getBacklog());
87          active = true;
88      }
89  
90      @Override
91      public InetSocketAddress remoteAddress() {
92          return (InetSocketAddress) super.remoteAddress();
93      }
94  
95      @Override
96      public InetSocketAddress localAddress() {
97          return (InetSocketAddress) super.localAddress();
98      }
99  
100     @Override
101     public EpollServerSocketChannelConfig config() {
102         return config;
103     }
104 
105     @Override
106     protected Channel newChildChannel(int fd, byte[] address, int offset, int len) throws Exception {
107         return new EpollSocketChannel(this, new Socket(fd), address(address, offset, len));
108     }
109 
110     Collection<InetAddress> tcpMd5SigAddresses() {
111         return tcpMd5SigAddresses;
112     }
113 
114     void setTcpMd5Sig(Map<InetAddress, byte[]> keys) throws IOException {
115         tcpMd5SigAddresses = TcpMd5Util.newTcpMd5Sigs(this, tcpMd5SigAddresses, keys);
116     }
117 }