1 /*
   2  * Copyright (c) 2007, 2016, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 package java.net;
  26 
  27 import java.io.IOException;
  28 import java.util.Set;
  29 import java.util.HashSet;
  30 import sun.net.ext.ExtendedSocketOptions;
  31 
  32 /*
  33  * On Unix systems we simply delegate to native methods.
  34  *
  35  * @author Chris Hegarty
  36  */
  37 
  38 class PlainDatagramSocketImpl extends AbstractPlainDatagramSocketImpl
  39 {
  40     static {
  41         init();
  42     }
  43 
  44     static final ExtendedSocketOptions extendedOptions =
  45             ExtendedSocketOptions.getInstance();
  46 
  47     protected <T> void setOption(SocketOption<T> name, T value) throws IOException {
  48         if (!extendedOptions.isOptionSupported(name)) {
  49             if (!name.equals(StandardSocketOptions.SO_REUSEPORT)) {
  50                 super.setOption(name, value);
  51             } else {
  52                if (supportedOptions().contains(name)) {
  53                    super.setOption(name, value);
  54                } else {
  55                    throw new UnsupportedOperationException("unsupported option");
  56                }
  57             }
  58         } else {
  59             if (isClosed()) {
  60                 throw new SocketException("Socket closed");
  61             }
  62             extendedOptions.setOption(fd, name, value);
  63         }
  64     }
  65 
  66     @SuppressWarnings("unchecked")
  67     protected <T> T getOption(SocketOption<T> name) throws IOException {
  68         if (!extendedOptions.isOptionSupported(name)) {
  69             if (!name.equals(StandardSocketOptions.SO_REUSEPORT)) {
  70                 return super.getOption(name);
  71             } else {
  72                 if (supportedOptions().contains(name)) {
  73                     return super.getOption(name);
  74                 } else {
  75                     throw new UnsupportedOperationException("unsupported option");
  76                 }
  77             }
  78         } else {
  79             if (isClosed()) {
  80                 throw new SocketException("Socket closed");
  81             }
  82             return (T) extendedOptions.getOption(fd, name);
  83         }
  84     }
  85 
  86     protected Set<SocketOption<?>> supportedOptions() {
  87         HashSet<SocketOption<?>> options = new HashSet<>(super.supportedOptions());
  88         options.addAll(extendedOptions.options());
  89         return options;
  90     }
  91 
  92     protected void socketSetOption(int opt, Object val) throws SocketException {
  93         if (opt == SocketOptions.SO_REUSEPORT &&
  94             !supportedOptions().contains(StandardSocketOptions.SO_REUSEPORT)) {
  95             throw new UnsupportedOperationException("unsupported option");
  96         }
  97         try {
  98             socketSetOption0(opt, val);
  99         } catch (SocketException se) {
 100             if (!connected)
 101                 throw se;
 102         }
 103     }
 104 
 105     protected synchronized native void bind0(int lport, InetAddress laddr)
 106         throws SocketException;
 107 
 108     protected native void send(DatagramPacket p) throws IOException;
 109 
 110     protected synchronized native int peek(InetAddress i) throws IOException;
 111 
 112     protected synchronized native int peekData(DatagramPacket p) throws IOException;
 113 
 114     protected synchronized native void receive0(DatagramPacket p)
 115         throws IOException;
 116 
 117     protected native void setTimeToLive(int ttl) throws IOException;
 118 
 119     protected native int getTimeToLive() throws IOException;
 120 
 121     @Deprecated
 122     protected native void setTTL(byte ttl) throws IOException;
 123 
 124     @Deprecated
 125     protected native byte getTTL() throws IOException;
 126 
 127     protected native void join(InetAddress inetaddr, NetworkInterface netIf)
 128         throws IOException;
 129 
 130     protected native void leave(InetAddress inetaddr, NetworkInterface netIf)
 131         throws IOException;
 132 
 133     protected native void datagramSocketCreate() throws SocketException;
 134 
 135     protected native void datagramSocketClose();
 136 
 137     protected native void socketSetOption0(int opt, Object val)
 138         throws SocketException;
 139 
 140     protected native Object socketGetOption(int opt) throws SocketException;
 141 
 142     protected native void connect0(InetAddress address, int port) throws SocketException;
 143 
 144     protected native void disconnect0(int family);
 145 
 146     native int dataAvailable();
 147 
 148     /**
 149      * Perform class load-time initializations.
 150      */
 151     private static native void init();
 152 }