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 */
25package java.net;
26
27import java.io.IOException;
28import java.util.Set;
29import java.util.HashSet;
30import sun.net.ext.ExtendedSocketOptions;
31
32/*
33 * On Unix systems we simply delegate to native methods.
34 *
35 * @author Chris Hegarty
36 */
37
38class 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}
153