1 /*
2 * Copyright (c) 2007, 2017, 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 addExtSocketOptions(extendedOptions.options(), options);
89 return options;
90 }
91
92 private void addExtSocketOptions(Set<SocketOption<?>> extOptions,
93 Set<SocketOption<?>> options) {
94 extOptions.stream().filter((option) -> (!option.name().
95 equals("TCP_QUICKACK"))).forEachOrdered((option) -> {
96 options.add(option);
97 }); // TCP_QUICKACK is applicable for TCP Sockets only.
98 }
99
100 protected void socketSetOption(int opt, Object val) throws SocketException {
101 if (opt == SocketOptions.SO_REUSEPORT &&
102 !supportedOptions().contains(StandardSocketOptions.SO_REUSEPORT)) {
103 throw new UnsupportedOperationException("unsupported option");
104 }
105 try {
106 socketSetOption0(opt, val);
107 } catch (SocketException se) {
108 if (!connected)
109 throw se;
110 }
111 }
112
113 protected synchronized native void bind0(int lport, InetAddress laddr)
114 throws SocketException;
115
116 protected native void send(DatagramPacket p) throws IOException;
117
118 protected synchronized native int peek(InetAddress i) throws IOException;
119
120 protected synchronized native int peekData(DatagramPacket p) throws IOException;
121
122 protected synchronized native void receive0(DatagramPacket p)
123 throws IOException;
124
125 protected native void setTimeToLive(int ttl) throws IOException;
126
127 protected native int getTimeToLive() throws IOException;
128
129 @Deprecated
130 protected native void setTTL(byte ttl) throws IOException;
131
132 @Deprecated
133 protected native byte getTTL() throws IOException;
134
135 protected native void join(InetAddress inetaddr, NetworkInterface netIf)
136 throws IOException;
137
138 protected native void leave(InetAddress inetaddr, NetworkInterface netIf)
139 throws IOException;
140
141 protected native void datagramSocketCreate() throws SocketException;
142
143 protected native void datagramSocketClose();
144
145 protected native void socketSetOption0(int opt, Object val)
146 throws SocketException;
147
148 protected native Object socketGetOption(int opt) throws SocketException;
149
150 protected native void connect0(InetAddress address, int port) throws SocketException;
151
152 protected native void disconnect0(int family);
153
154 native int dataAvailable();
155
156 /**
157 * Perform class load-time initializations.
158 */
159 private static native void init();
160 }