/*
* Copyright (c) 2007, 2016, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
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*/
package java.net;
import java.io.IOException;
import java.io.FileDescriptor;
import sun.net.ResourceManager;
/**
* This class defines the plain DatagramSocketImpl that is used for all
* Windows versions lower than Vista. It adds support for IPv6 on
* these platforms where available.
*
* For backward compatibility windows platforms that do not have IPv6
* support also use this implementation, and fd1 gets set to null
* during socket creation.
*
* @author Chris Hegarty
*/
class TwoStacksPlainDatagramSocketImpl extends AbstractPlainDatagramSocketImpl
{
/* Used for IPv6 on Windows only */
private FileDescriptor fd1;
/*
* Needed for ipv6 on windows because we need to know
* if the socket was bound to ::0 or 0.0.0.0, when a caller
* asks for it. In this case, both sockets are used, but we
* don't know whether the caller requested ::0 or 0.0.0.0
* and need to remember it here.
*/
private InetAddress anyLocalBoundAddr=null;
private int fduse=-1; /* saved between peek() and receive() calls */
/* saved between successive calls to receive, if data is detected
* on both sockets at same time. To ensure that one socket is not
* starved, they rotate using this field
*/
private int lastfd=-1;
static {
init();
}
// true if this socket is exclusively bound
private final boolean exclusiveBind;
/*
* Set to true if SO_REUSEADDR is set after the socket is bound to
* indicate SO_REUSEADDR is being emulated
*/
private boolean reuseAddressEmulated;
// emulates SO_REUSEADDR when exclusiveBind is true and socket is bound
private boolean isReuseAddress;
TwoStacksPlainDatagramSocketImpl(boolean exclBind) {
exclusiveBind = exclBind;
}
protected synchronized void create() throws SocketException {
fd1 = new FileDescriptor();
try {
super.create();
} catch (SocketException e) {
fd1 = null;
throw e;
}
}
protected synchronized void bind(int lport, InetAddress laddr)
throws SocketException {
super.bind(lport, laddr);
if (laddr.isAnyLocalAddress()) {
anyLocalBoundAddr = laddr;
}
}
@Override
protected synchronized void bind0(int lport, InetAddress laddr)
throws SocketException
{
bind0(lport, laddr, exclusiveBind);
}
protected synchronized void receive(DatagramPacket p)
throws IOException {
try {
receive0(p);
} finally {
fduse = -1;
}
}
public Object getOption(int optID) throws SocketException {
if (isClosed()) {
throw new SocketException("Socket Closed");
}
if (optID == SO_BINDADDR) {
if ((fd != null && fd1 != null) && !connected) {
return anyLocalBoundAddr;
}
int family = connectedAddress == null ? -1 : connectedAddress.holder().getFamily();
return socketLocalAddress(family);
} else if (optID == SO_REUSEADDR && reuseAddressEmulated) {
return isReuseAddress;
} else if (optID == SO_REUSEPORT) {
// SO_REUSEPORT is not supported on Windows.
throw new UnsupportedOperationException("unsupported option");
} else {
return super.getOption(optID);
}
}
protected void socketSetOption(int opt, Object val)
throws SocketException
{
if (opt == SO_REUSEADDR && exclusiveBind && localPort != 0) {
// socket already bound, emulate
reuseAddressEmulated = true;
isReuseAddress = (Boolean)val;
} else if (opt == SO_REUSEPORT) {
// SO_REUSEPORT is not supported on Windows.
throw new UnsupportedOperationException("unsupported option");
} else {
socketNativeSetOption(opt, val);
}
}
protected boolean isClosed() {
return (fd == null && fd1 == null) ? true : false;
}
protected void close() {
if (fd != null || fd1 != null) {
datagramSocketClose();
ResourceManager.afterUdpClose();
fd = null;
fd1 = null;
}
}
/* Native methods */
protected synchronized native void bind0(int lport, InetAddress laddr,
boolean exclBind)
throws SocketException;
protected native void send(DatagramPacket p) throws IOException;
protected synchronized native int peek(InetAddress i) throws IOException;
protected synchronized native int peekData(DatagramPacket p) throws IOException;
protected synchronized native void receive0(DatagramPacket p)
throws IOException;
protected native void setTimeToLive(int ttl) throws IOException;
protected native int getTimeToLive() throws IOException;
@Deprecated
protected native void setTTL(byte ttl) throws IOException;
@Deprecated
protected native byte getTTL() throws IOException;
protected native void join(InetAddress inetaddr, NetworkInterface netIf)
throws IOException;
protected native void leave(InetAddress inetaddr, NetworkInterface netIf)
throws IOException;
protected native void datagramSocketCreate() throws SocketException;
protected native void datagramSocketClose();
protected native void socketNativeSetOption(int opt, Object val)
throws SocketException;
protected native Object socketGetOption(int opt) throws SocketException;
protected native void connect0(InetAddress address, int port) throws SocketException;
protected native Object socketLocalAddress(int family) throws SocketException;
protected native void disconnect0(int family);
native int dataAvailable();
/**
* Perform class load-time initializations.
*/
private static native void init();
}