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/*
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* Copyright 2007 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Sun designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Sun in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*/
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package java.net;
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import java.io.IOException;
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import java.io.FileDescriptor;
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/**
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* This class defines the plain DatagramSocketImpl that is used for all
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* Windows versions lower than Vista. It adds support for IPv6 on
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* these platforms where available.
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*
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* For backward compatibility windows platforms that do not have IPv6
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* support also use this implementation, and fd1 gets set to null
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* during socket creation.
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*
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* @author Chris Hegarty
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*/
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class TwoStacksPlainDatagramSocketImpl extends AbstractPlainDatagramSocketImpl
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{
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/* Used for IPv6 on Windows only */
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private FileDescriptor fd1;
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/*
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* Needed for ipv6 on windows because we need to know
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* if the socket was bound to ::0 or 0.0.0.0, when a caller
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* asks for it. In this case, both sockets are used, but we
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* don't know whether the caller requested ::0 or 0.0.0.0
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* and need to remember it here.
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*/
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private InetAddress anyLocalBoundAddr=null;
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private int fduse=-1; /* saved between peek() and receive() calls */
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/* saved between successive calls to receive, if data is detected
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* on both sockets at same time. To ensure that one socket is not
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* starved, they rotate using this field
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*/
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private int lastfd=-1;
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static {
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init();
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}
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protected synchronized void create() throws SocketException {
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fd1 = new FileDescriptor();
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super.create();
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}
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protected synchronized void bind(int lport, InetAddress laddr)
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throws SocketException {
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super.bind(lport, laddr);
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if (laddr.isAnyLocalAddress()) {
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anyLocalBoundAddr = laddr;
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}
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}
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protected synchronized void receive(DatagramPacket p)
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throws IOException {
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try {
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receive0(p);
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} finally {
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fduse = -1;
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}
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}
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public Object getOption(int optID) throws SocketException {
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if (isClosed()) {
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throw new SocketException("Socket Closed");
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}
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if (optID == SO_BINDADDR) {
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if (fd != null && fd1 != null) {
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return anyLocalBoundAddr;
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}
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return socketGetOption(optID);
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} else
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return super.getOption(optID);
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}
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protected boolean isClosed() {
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return (fd == null && fd1 == null) ? true : false;
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}
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protected void close() {
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if (fd != null || fd1 != null) {
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datagramSocketClose();
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fd = null;
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fd1 = null;
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}
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}
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/* Native methods */
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protected synchronized native void bind0(int lport, InetAddress laddr)
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throws SocketException;
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protected native void send(DatagramPacket p) throws IOException;
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protected synchronized native int peek(InetAddress i) throws IOException;
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protected synchronized native int peekData(DatagramPacket p) throws IOException;
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protected synchronized native void receive0(DatagramPacket p)
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throws IOException;
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protected native void setTimeToLive(int ttl) throws IOException;
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protected native int getTimeToLive() throws IOException;
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protected native void setTTL(byte ttl) throws IOException;
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protected native byte getTTL() throws IOException;
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protected native void join(InetAddress inetaddr, NetworkInterface netIf)
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throws IOException;
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protected native void leave(InetAddress inetaddr, NetworkInterface netIf)
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throws IOException;
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protected native void datagramSocketCreate() throws SocketException;
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protected native void datagramSocketClose();
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protected native void socketSetOption(int opt, Object val)
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throws SocketException;
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protected native Object socketGetOption(int opt) throws SocketException;
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protected native void connect0(InetAddress address, int port) throws SocketException;
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protected native void disconnect0(int family);
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/**
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* Perform class load-time initializations.
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*/
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private native static void init();
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}
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