/*
* Copyright (c) 2007, 2008, 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
* questions.
*/
package java.net;
import java.io.IOException;
import java.io.FileDescriptor;
import sun.misc.SharedSecrets;
import sun.misc.JavaIOFileDescriptorAccess;
/**
* This class defines the plain SocketImpl that is used on Windows platforms
* greater or equal to Windows Vista. These platforms have a dual
* layer TCP/IP stack and can handle both IPv4 and IPV6 through a
* single file descriptor.
*
* @author Chris Hegarty
*/
class DualStackPlainSocketImpl extends AbstractPlainSocketImpl
{
static JavaIOFileDescriptorAccess fdAccess = SharedSecrets.getJavaIOFileDescriptorAccess();
// true if this socket is exclusively bound
private final boolean exclusiveBind;
// emulates SO_REUSEADDR when exclusiveBind is true
private boolean isReuseAddress;
public DualStackPlainSocketImpl(boolean exclBind) {
exclusiveBind = exclBind;
}
public DualStackPlainSocketImpl(FileDescriptor fd, boolean exclBind) {
this.fd = fd;
exclusiveBind = exclBind;
}
void socketCreate(boolean stream) throws IOException {
if (fd == null)
throw new SocketException("Socket closed");
int newfd = socket0(stream, false /*v6 Only*/);
fdAccess.set(fd, newfd);
}
void socketConnect(InetAddress address, int port, int timeout)
throws IOException {
int nativefd = checkAndReturnNativeFD();
if (address == null)
throw new NullPointerException("inet address argument is null.");
int connectResult;
if (timeout <= 0) {
connectResult = connect0(nativefd, address, port);
} else {
configureBlocking(nativefd, false);
try {
connectResult = connect0(nativefd, address, port);
if (connectResult == WOULDBLOCK) {
waitForConnect(nativefd, timeout);
}
} finally {
configureBlocking(nativefd, true);
}
}
/*
* We need to set the local port field. If bind was called
* previous to the connect (by the client) then localport field
* will already be set.
*/
if (localport == 0)
localport = localPort0(nativefd);
}
void socketBind(InetAddress address, int port) throws IOException {
int nativefd = checkAndReturnNativeFD();
if (address == null)
throw new NullPointerException("inet address argument is null.");
bind0(nativefd, address, port, exclusiveBind);
if (port == 0) {
localport = localPort0(nativefd);
} else {
localport = port;
}
this.address = address;
}
void socketListen(int backlog) throws IOException {
int nativefd = checkAndReturnNativeFD();
listen0(nativefd, backlog);
}
void socketAccept(SocketImpl s) throws IOException {
int nativefd = checkAndReturnNativeFD();
if (s == null)
throw new NullPointerException("socket is null");
int newfd = -1;
InetSocketAddress[] isaa = new InetSocketAddress[1];
if (timeout <= 0) {
newfd = accept0(nativefd, isaa);
} else {
configureBlocking(nativefd, false);
try {
waitForNewConnection(nativefd, timeout);
newfd = accept0(nativefd, isaa);
if (newfd != -1) {
configureBlocking(newfd, true);
}
} finally {
configureBlocking(nativefd, true);
}
}
/* Update (SocketImpl)s' fd */
fdAccess.set(s.fd, newfd);
/* Update socketImpls remote port, address and localport */
InetSocketAddress isa = isaa[0];
s.port = isa.getPort();
s.address = isa.getAddress();
s.localport = localport;
}
int socketAvailable() throws IOException {
int nativefd = checkAndReturnNativeFD();
return available0(nativefd);
}
void socketClose0(boolean useDeferredClose/*unused*/) throws IOException {
if (fd == null)
throw new SocketException("Socket closed");
if (!fd.valid())
return;
final int nativefd = fdAccess.get(fd);
fdAccess.set(fd, -1);
close0(nativefd);
}
void socketShutdown(int howto) throws IOException {
int nativefd = checkAndReturnNativeFD();
shutdown0(nativefd, howto);
}
// Intentional fallthrough after SO_REUSEADDR
@SuppressWarnings("fallthrough")
void socketSetOption(int opt, boolean on, Object value)
throws SocketException {
int nativefd = checkAndReturnNativeFD();
if (opt == SO_TIMEOUT) { // timeout implemented through select.
return;
}
int optionValue = 0;
switch(opt) {
case SO_REUSEADDR :
if (exclusiveBind) {
// SO_REUSEADDR emulated when using exclusive bind
isReuseAddress = on;
return;
}
// intentional fallthrough
case TCP_NODELAY :
case SO_OOBINLINE :
case SO_KEEPALIVE :
optionValue = on ? 1 : 0;
break;
case SO_SNDBUF :
case SO_RCVBUF :
case IP_TOS :
optionValue = ((Integer)value).intValue();
break;
case SO_LINGER :
if (on) {
optionValue = ((Integer)value).intValue();
} else {
optionValue = -1;
}
break;
default :/* shouldn't get here */
throw new SocketException("Option not supported");
}
setIntOption(nativefd, opt, optionValue);
}
int socketGetOption(int opt, Object iaContainerObj) throws SocketException {
int nativefd = checkAndReturnNativeFD();
// SO_BINDADDR is not a socket option.
if (opt == SO_BINDADDR) {
localAddress(nativefd, (InetAddressContainer)iaContainerObj);
return 0; // return value doesn't matter.
}
// SO_REUSEADDR emulated when using exclusive bind
if (opt == SO_REUSEADDR && exclusiveBind)
return isReuseAddress? 1 : -1;
int value = getIntOption(nativefd, opt);
switch (opt) {
case TCP_NODELAY :
case SO_OOBINLINE :
case SO_KEEPALIVE :
case SO_REUSEADDR :
return (value == 0) ? -1 : 1;
}
return value;
}
void socketSendUrgentData(int data) throws IOException {
int nativefd = checkAndReturnNativeFD();
sendOOB(nativefd, data);
}
private int checkAndReturnNativeFD() throws SocketException {
if (fd == null || !fd.valid())
throw new SocketException("Socket closed");
return fdAccess.get(fd);
}
static final int WOULDBLOCK = -2; // Nothing available (non-blocking)
static {
initIDs();
}
/* Native methods */
static native void initIDs();
static native int socket0(boolean stream, boolean v6Only) throws IOException;
static native void bind0(int fd, InetAddress localAddress, int localport,
boolean exclBind)
throws IOException;
static native int connect0(int fd, InetAddress remote, int remotePort)
throws IOException;
static native void waitForConnect(int fd, int timeout) throws IOException;
static native int localPort0(int fd) throws IOException;
static native void localAddress(int fd, InetAddressContainer in) throws SocketException;
static native void listen0(int fd, int backlog) throws IOException;
static native int accept0(int fd, InetSocketAddress[] isaa) throws IOException;
static native void waitForNewConnection(int fd, int timeout) throws IOException;
static native int available0(int fd) throws IOException;
static native void close0(int fd) throws IOException;
static native void shutdown0(int fd, int howto) throws IOException;
static native void setIntOption(int fd, int cmd, int optionValue) throws SocketException;
static native int getIntOption(int fd, int cmd) throws SocketException;
static native void sendOOB(int fd, int data) throws IOException;
static native void configureBlocking(int fd, boolean blocking) throws IOException;
}