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 java.util.Iterator;
31 import sun.net.ext.ExtendedSocketOptions;
32
33 /*
34 * On Unix systems we simply delegate to native methods.
35 *
36 * @author Chris Hegarty
37 */
38
39 class PlainDatagramSocketImpl extends AbstractPlainDatagramSocketImpl
40 {
41 static {
42 init();
43 }
44
45 static final ExtendedSocketOptions extendedOptions =
46 ExtendedSocketOptions.getInstance();
47
48 protected <T> void setOption(SocketOption<T> name, T value) throws IOException {
49 if (!extendedOptions.isOptionSupported(name)) {
50 if (!name.equals(StandardSocketOptions.SO_REUSEPORT)) {
51 super.setOption(name, value);
52 } else {
53 if (supportedOptions().contains(name)) {
54 super.setOption(name, value);
55 } else {
56 throw new UnsupportedOperationException("unsupported option");
57 }
58 }
59 } else {
60 if (isClosed()) {
61 throw new SocketException("Socket closed");
62 }
63 extendedOptions.setOption(fd, name, value);
64 }
65 }
66
67 @SuppressWarnings("unchecked")
68 protected <T> T getOption(SocketOption<T> name) throws IOException {
69 if (!extendedOptions.isOptionSupported(name)) {
70 if (!name.equals(StandardSocketOptions.SO_REUSEPORT)) {
71 return super.getOption(name);
72 } else {
73 if (supportedOptions().contains(name)) {
74 return super.getOption(name);
75 } else {
76 throw new UnsupportedOperationException("unsupported option");
77 }
78 }
79 } else {
80 if (isClosed()) {
81 throw new SocketException("Socket closed");
82 }
83 return (T) extendedOptions.getOption(fd, name);
84 }
85 }
86
87 protected Set<SocketOption<?>> supportedOptions() {
88 HashSet<SocketOption<?>> options = new HashSet<>(super.supportedOptions());
89 options.addAll(filterSocketOption(extendedOptions.options()));
90 return options;
91 }
92
93 private Set<SocketOption<?>> filterSocketOption(Set<SocketOption<?>> options) {
94 Set<SocketOption<?>> opt = new HashSet<>(options);
95 final Iterator<SocketOption<?>> iterator = opt.iterator();
96 while (iterator.hasNext()) {
97 SocketOption<?> option = iterator.next();
98 // SO_QUICKACK is applicable for TCP Sockets only.
99 if (option.name().equals("SO_QUICKACK")) {
100 iterator.remove();
101 break;
102 }
103 }
104 return opt;
105 }
106
107 protected void socketSetOption(int opt, Object val) throws SocketException {
108 if (opt == SocketOptions.SO_REUSEPORT &&
109 !supportedOptions().contains(StandardSocketOptions.SO_REUSEPORT)) {
110 throw new UnsupportedOperationException("unsupported option");
111 }
112 try {
113 socketSetOption0(opt, val);
114 } catch (SocketException se) {
115 if (!connected)
116 throw se;
117 }
118 }
119
120 protected synchronized native void bind0(int lport, InetAddress laddr)
121 throws SocketException;
122
123 protected native void send(DatagramPacket p) throws IOException;
124
125 protected synchronized native int peek(InetAddress i) throws IOException;
126
127 protected synchronized native int peekData(DatagramPacket p) throws IOException;
128
129 protected synchronized native void receive0(DatagramPacket p)
130 throws IOException;
131
132 protected native void setTimeToLive(int ttl) throws IOException;
133
134 protected native int getTimeToLive() throws IOException;
135
136 @Deprecated
137 protected native void setTTL(byte ttl) throws IOException;
138
139 @Deprecated
140 protected native byte getTTL() throws IOException;
141
142 protected native void join(InetAddress inetaddr, NetworkInterface netIf)
143 throws IOException;
144
145 protected native void leave(InetAddress inetaddr, NetworkInterface netIf)
146 throws IOException;
147
148 protected native void datagramSocketCreate() throws SocketException;
149
150 protected native void datagramSocketClose();
151
152 protected native void socketSetOption0(int opt, Object val)
153 throws SocketException;
154
155 protected native Object socketGetOption(int opt) throws SocketException;
156
157 protected native void connect0(InetAddress address, int port) throws SocketException;
158
159 protected native void disconnect0(int family);
160
161 native int dataAvailable();
162
163 /**
164 * Perform class load-time initializations.
165 */
166 private static native void init();
167 }