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/*
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* Copyright (c) 1996, 2007, Oracle and/or its affiliates. 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. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package java.net;
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import java.io.FileDescriptor;
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import java.io.IOException;
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import java.io.InterruptedIOException;
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import java.util.Enumeration;
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/**
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* Abstract datagram and multicast socket implementation base class.
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* Note: This is not a public class, so that applets cannot call
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* into the implementation directly and hence cannot bypass the
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* security checks present in the DatagramSocket and MulticastSocket
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* classes.
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*
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* @author Pavani Diwanji
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*/
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abstract class AbstractPlainDatagramSocketImpl extends DatagramSocketImpl
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{
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/* timeout value for receive() */
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int timeout = 0;
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boolean connected = false;
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private int trafficClass = 0;
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private InetAddress connectedAddress = null;
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private int connectedPort = -1;
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/* cached socket options */
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private int multicastInterface = 0;
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private boolean loopbackMode = true;
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private int ttl = -1;
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/**
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* Load net library into runtime.
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*/
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static {
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java.security.AccessController.doPrivileged(
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new sun.security.action.LoadLibraryAction("net"));
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}
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/**
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* Creates a datagram socket
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*/
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protected synchronized void create() throws SocketException {
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fd = new FileDescriptor();
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datagramSocketCreate();
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}
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/**
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* Binds a datagram socket to a local port.
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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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bind0(lport, laddr);
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}
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protected abstract void bind0(int lport, InetAddress laddr)
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throws SocketException;
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/**
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* Sends a datagram packet. The packet contains the data and the
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* destination address to send the packet to.
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* @param packet to be sent.
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*/
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protected abstract void send(DatagramPacket p) throws IOException;
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/**
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* Connects a datagram socket to a remote destination. This associates the remote
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* address with the local socket so that datagrams may only be sent to this destination
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* and received from this destination.
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* @param address the remote InetAddress to connect to
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* @param port the remote port number
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*/
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protected void connect(InetAddress address, int port) throws SocketException {
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connect0(address, port);
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connectedAddress = address;
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connectedPort = port;
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connected = true;
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}
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/**
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* Disconnects a previously connected socket. Does nothing if the socket was
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* not connected already.
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*/
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protected void disconnect() {
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disconnect0(connectedAddress.family);
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connected = false;
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connectedAddress = null;
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connectedPort = -1;
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}
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/**
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* Peek at the packet to see who it is from.
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* @param return the address which the packet came from.
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*/
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protected abstract int peek(InetAddress i) throws IOException;
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protected abstract int peekData(DatagramPacket p) throws IOException;
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/**
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* Receive the datagram packet.
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* @param Packet Received.
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*/
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protected synchronized void receive(DatagramPacket p)
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throws IOException {
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receive0(p);
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}
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protected abstract void receive0(DatagramPacket p)
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throws IOException;
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/**
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* Set the TTL (time-to-live) option.
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* @param TTL to be set.
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*/
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protected abstract void setTimeToLive(int ttl) throws IOException;
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/**
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* Get the TTL (time-to-live) option.
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*/
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protected abstract int getTimeToLive() throws IOException;
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/**
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* Set the TTL (time-to-live) option.
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* @param TTL to be set.
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*/
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protected abstract void setTTL(byte ttl) throws IOException;
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/**
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* Get the TTL (time-to-live) option.
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*/
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protected abstract byte getTTL() throws IOException;
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/**
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* Join the multicast group.
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* @param multicast address to join.
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*/
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protected void join(InetAddress inetaddr) throws IOException {
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join(inetaddr, null);
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}
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/**
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* Leave the multicast group.
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* @param multicast address to leave.
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*/
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protected void leave(InetAddress inetaddr) throws IOException {
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leave(inetaddr, null);
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}
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/**
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* Join the multicast group.
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* @param multicast address to join.
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* @param netIf specifies the local interface to receive multicast
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* datagram packets
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* @throws IllegalArgumentException if mcastaddr is null or is a
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* SocketAddress subclass not supported by this socket
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* @since 1.4
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*/
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protected void joinGroup(SocketAddress mcastaddr, NetworkInterface netIf)
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throws IOException {
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if (mcastaddr == null || !(mcastaddr instanceof InetSocketAddress))
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throw new IllegalArgumentException("Unsupported address type");
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join(((InetSocketAddress)mcastaddr).getAddress(), netIf);
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}
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protected abstract void join(InetAddress inetaddr, NetworkInterface netIf)
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throws IOException;
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/**
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* Leave the multicast group.
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* @param multicast address to leave.
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* @param netIf specified the local interface to leave the group at
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* @throws IllegalArgumentException if mcastaddr is null or is a
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* SocketAddress subclass not supported by this socket
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* @since 1.4
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*/
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protected void leaveGroup(SocketAddress mcastaddr, NetworkInterface netIf)
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throws IOException {
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if (mcastaddr == null || !(mcastaddr instanceof InetSocketAddress))
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throw new IllegalArgumentException("Unsupported address type");
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leave(((InetSocketAddress)mcastaddr).getAddress(), netIf);
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}
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protected abstract void leave(InetAddress inetaddr, NetworkInterface netIf)
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throws IOException;
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/**
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* Close the socket.
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*/
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protected void close() {
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if (fd != null) {
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datagramSocketClose();
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fd = null;
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}
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}
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protected boolean isClosed() {
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return (fd == null) ? true : false;
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}
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protected void finalize() {
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close();
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}
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/**
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* set a value - since we only support (setting) binary options
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* here, o must be a Boolean
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*/
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public void setOption(int optID, Object o) 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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switch (optID) {
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/* check type safety b4 going native. These should never
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* fail, since only java.Socket* has access to
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* PlainSocketImpl.setOption().
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*/
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case SO_TIMEOUT:
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if (o == null || !(o instanceof Integer)) {
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throw new SocketException("bad argument for SO_TIMEOUT");
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}
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int tmp = ((Integer) o).intValue();
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if (tmp < 0)
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throw new IllegalArgumentException("timeout < 0");
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timeout = tmp;
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return;
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case IP_TOS:
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if (o == null || !(o instanceof Integer)) {
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throw new SocketException("bad argument for IP_TOS");
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}
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trafficClass = ((Integer)o).intValue();
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break;
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case SO_REUSEADDR:
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if (o == null || !(o instanceof Boolean)) {
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throw new SocketException("bad argument for SO_REUSEADDR");
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}
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break;
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case SO_BROADCAST:
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if (o == null || !(o instanceof Boolean)) {
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throw new SocketException("bad argument for SO_BROADCAST");
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}
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break;
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case SO_BINDADDR:
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throw new SocketException("Cannot re-bind Socket");
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case SO_RCVBUF:
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case SO_SNDBUF:
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if (o == null || !(o instanceof Integer) ||
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((Integer)o).intValue() < 0) {
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throw new SocketException("bad argument for SO_SNDBUF or " +
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"SO_RCVBUF");
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}
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break;
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case IP_MULTICAST_IF:
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if (o == null || !(o instanceof InetAddress))
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throw new SocketException("bad argument for IP_MULTICAST_IF");
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break;
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case IP_MULTICAST_IF2:
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if (o == null || !(o instanceof NetworkInterface))
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throw new SocketException("bad argument for IP_MULTICAST_IF2");
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break;
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case IP_MULTICAST_LOOP:
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if (o == null || !(o instanceof Boolean))
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throw new SocketException("bad argument for IP_MULTICAST_LOOP");
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break;
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default:
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throw new SocketException("invalid option: " + optID);
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}
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socketSetOption(optID, o);
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}
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/*
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* get option's state - set or not
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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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Object result;
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switch (optID) {
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case SO_TIMEOUT:
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result = new Integer(timeout);
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break;
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case IP_TOS:
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result = socketGetOption(optID);
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if ( ((Integer)result).intValue() == -1) {
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result = new Integer(trafficClass);
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}
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break;
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case SO_BINDADDR:
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case IP_MULTICAST_IF:
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case IP_MULTICAST_IF2:
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case SO_RCVBUF:
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case SO_SNDBUF:
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case IP_MULTICAST_LOOP:
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case SO_REUSEADDR:
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case SO_BROADCAST:
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result = socketGetOption(optID);
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break;
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default:
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throw new SocketException("invalid option: " + optID);
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}
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return result;
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}
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protected abstract void datagramSocketCreate() throws SocketException;
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protected abstract void datagramSocketClose();
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protected abstract void socketSetOption(int opt, Object val)
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throws SocketException;
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protected abstract Object socketGetOption(int opt) throws SocketException;
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protected abstract void connect0(InetAddress address, int port) throws SocketException;
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protected abstract void disconnect0(int family);
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}
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