J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2007 Sun Microsystems, Inc. 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. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | package java.net; |
| 26 | |
| 27 | import java.io.IOException; |
| 28 | import java.io.FileDescriptor; |
| 29 | |
| 30 | /** |
| 31 | * This class defines the plain DatagramSocketImpl that is used for all |
| 32 | * Windows versions lower than Vista. It adds support for IPv6 on |
| 33 | * these platforms where available. |
| 34 | * |
| 35 | * For backward compatibility windows platforms that do not have IPv6 |
| 36 | * support also use this implementation, and fd1 gets set to null |
| 37 | * during socket creation. |
| 38 | * |
| 39 | * @author Chris Hegarty |
| 40 | */ |
| 41 | |
| 42 | class TwoStacksPlainDatagramSocketImpl extends AbstractPlainDatagramSocketImpl |
| 43 | { |
| 44 | /* Used for IPv6 on Windows only */ |
| 45 | private FileDescriptor fd1; |
| 46 | |
| 47 | /* |
| 48 | * Needed for ipv6 on windows because we need to know |
| 49 | * if the socket was bound to ::0 or 0.0.0.0, when a caller |
| 50 | * asks for it. In this case, both sockets are used, but we |
| 51 | * don't know whether the caller requested ::0 or 0.0.0.0 |
| 52 | * and need to remember it here. |
| 53 | */ |
| 54 | private InetAddress anyLocalBoundAddr=null; |
| 55 | |
| 56 | private int fduse=-1; /* saved between peek() and receive() calls */ |
| 57 | |
| 58 | /* saved between successive calls to receive, if data is detected |
| 59 | * on both sockets at same time. To ensure that one socket is not |
| 60 | * starved, they rotate using this field |
| 61 | */ |
| 62 | private int lastfd=-1; |
| 63 | |
| 64 | static { |
| 65 | init(); |
| 66 | } |
| 67 | |
| 68 | protected synchronized void create() throws SocketException { |
| 69 | fd1 = new FileDescriptor(); |
| 70 | super.create(); |
| 71 | } |
| 72 | |
| 73 | protected synchronized void bind(int lport, InetAddress laddr) |
| 74 | throws SocketException { |
| 75 | super.bind(lport, laddr); |
| 76 | if (laddr.isAnyLocalAddress()) { |
| 77 | anyLocalBoundAddr = laddr; |
| 78 | } |
| 79 | } |
| 80 | |
| 81 | protected synchronized void receive(DatagramPacket p) |
| 82 | throws IOException { |
| 83 | try { |
| 84 | receive0(p); |
| 85 | } finally { |
| 86 | fduse = -1; |
| 87 | } |
| 88 | } |
| 89 | |
| 90 | public Object getOption(int optID) throws SocketException { |
| 91 | if (isClosed()) { |
| 92 | throw new SocketException("Socket Closed"); |
| 93 | } |
| 94 | |
| 95 | if (optID == SO_BINDADDR) { |
| 96 | if (fd != null && fd1 != null) { |
| 97 | return anyLocalBoundAddr; |
| 98 | } |
| 99 | return socketGetOption(optID); |
| 100 | } else |
| 101 | return super.getOption(optID); |
| 102 | } |
| 103 | |
| 104 | protected boolean isClosed() { |
| 105 | return (fd == null && fd1 == null) ? true : false; |
| 106 | } |
| 107 | |
| 108 | protected void close() { |
| 109 | if (fd != null || fd1 != null) { |
| 110 | datagramSocketClose(); |
| 111 | fd = null; |
| 112 | fd1 = null; |
| 113 | } |
| 114 | } |
| 115 | |
| 116 | /* Native methods */ |
| 117 | |
| 118 | protected synchronized native void bind0(int lport, InetAddress laddr) |
| 119 | throws SocketException; |
| 120 | |
| 121 | protected native void send(DatagramPacket p) throws IOException; |
| 122 | |
| 123 | protected synchronized native int peek(InetAddress i) throws IOException; |
| 124 | |
| 125 | protected synchronized native int peekData(DatagramPacket p) throws IOException; |
| 126 | |
| 127 | protected synchronized native void receive0(DatagramPacket p) |
| 128 | throws IOException; |
| 129 | |
| 130 | protected native void setTimeToLive(int ttl) throws IOException; |
| 131 | |
| 132 | protected native int getTimeToLive() throws IOException; |
| 133 | |
| 134 | protected native void setTTL(byte ttl) throws IOException; |
| 135 | |
| 136 | protected native byte getTTL() throws IOException; |
| 137 | |
| 138 | protected native void join(InetAddress inetaddr, NetworkInterface netIf) |
| 139 | throws IOException; |
| 140 | |
| 141 | protected native void leave(InetAddress inetaddr, NetworkInterface netIf) |
| 142 | throws IOException; |
| 143 | |
| 144 | protected native void datagramSocketCreate() throws SocketException; |
| 145 | |
| 146 | protected native void datagramSocketClose(); |
| 147 | |
| 148 | protected native void socketSetOption(int opt, Object val) |
| 149 | throws SocketException; |
| 150 | |
| 151 | protected native Object socketGetOption(int opt) throws SocketException; |
| 152 | |
| 153 | protected native void connect0(InetAddress address, int port) throws SocketException; |
| 154 | |
| 155 | protected native void disconnect0(int family); |
| 156 | |
| 157 | /** |
| 158 | * Perform class load-time initializations. |
| 159 | */ |
| 160 | private native static void init(); |
| 161 | } |