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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    *   https://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.InternetProtocolFamily;
21  import io.netty.channel.socket.ServerSocketChannel;
22  
23  import java.io.IOException;
24  import java.net.InetAddress;
25  import java.net.InetSocketAddress;
26  import java.net.SocketAddress;
27  import java.util.Collection;
28  import java.util.Collections;
29  import java.util.Map;
30  
31  import static io.netty.channel.epoll.LinuxSocket.newSocketStream;
32  import static io.netty.channel.epoll.Native.IS_SUPPORTING_TCP_FASTOPEN_SERVER;
33  import static io.netty.channel.unix.NativeInetAddress.address;
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          this((InternetProtocolFamily) null);
46      }
47  
48      public EpollServerSocketChannel(InternetProtocolFamily protocol) {
49          super(newSocketStream(protocol), false);
50          config = new EpollServerSocketChannelConfig(this);
51      }
52  
53      public EpollServerSocketChannel(int fd) {
54          // Must call this constructor to ensure this object's local address is configured correctly.
55          // The local address can only be obtained from a Socket object.
56          this(new LinuxSocket(fd));
57      }
58  
59      EpollServerSocketChannel(LinuxSocket fd) {
60          super(fd);
61          config = new EpollServerSocketChannelConfig(this);
62      }
63  
64      EpollServerSocketChannel(LinuxSocket fd, boolean active) {
65          super(fd, active);
66          config = new EpollServerSocketChannelConfig(this);
67      }
68  
69      @Override
70      protected boolean isCompatible(EventLoop loop) {
71          return loop instanceof EpollEventLoop;
72      }
73  
74      @Override
75      protected void doBind(SocketAddress localAddress) throws Exception {
76          super.doBind(localAddress);
77          final int tcpFastopen;
78          if (IS_SUPPORTING_TCP_FASTOPEN_SERVER && (tcpFastopen = config.getTcpFastopen()) > 0) {
79              socket.setTcpFastOpen(tcpFastopen);
80          }
81          socket.listen(config.getBacklog());
82          active = true;
83      }
84  
85      @Override
86      public InetSocketAddress remoteAddress() {
87          return (InetSocketAddress) super.remoteAddress();
88      }
89  
90      @Override
91      public InetSocketAddress localAddress() {
92          return (InetSocketAddress) super.localAddress();
93      }
94  
95      @Override
96      public EpollServerSocketChannelConfig config() {
97          return config;
98      }
99  
100     @Override
101     protected Channel newChildChannel(int fd, byte[] address, int offset, int len) throws Exception {
102         return new EpollSocketChannel(this, new LinuxSocket(fd), address(address, offset, len));
103     }
104 
105     Collection<InetAddress> tcpMd5SigAddresses() {
106         return tcpMd5SigAddresses;
107     }
108 
109     void setTcpMd5Sig(Map<InetAddress, byte[]> keys) throws IOException {
110         tcpMd5SigAddresses = TcpMd5Util.newTcpMd5Sigs(this, tcpMd5SigAddresses, keys);
111     }
112 }