| /* |
| * Copyright (c) 2007, 2011, 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.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(); |
| } |
| |
| 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; |
| } |
| } |
| |
| 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.family; |
| return socketLocalAddress(family); |
| } else |
| return super.getOption(optID); |
| } |
| |
| 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) |
| 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 socketSetOption(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); |
| |
| /** |
| * Perform class load-time initializations. |
| */ |
| private native static void init(); |
| } |