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/*
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* Copyright 1995-2007 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.InterruptedIOException;
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import java.util.Enumeration;
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/**
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* The multicast datagram socket class is useful for sending
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* and receiving IP multicast packets. A MulticastSocket is
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* a (UDP) DatagramSocket, with additional capabilities for
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* joining "groups" of other multicast hosts on the internet.
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* <P>
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* A multicast group is specified by a class D IP address
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* and by a standard UDP port number. Class D IP addresses
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* are in the range <CODE>224.0.0.0</CODE> to <CODE>239.255.255.255</CODE>,
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* inclusive. The address 224.0.0.0 is reserved and should not be used.
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* <P>
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* One would join a multicast group by first creating a MulticastSocket
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* with the desired port, then invoking the
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* <CODE>joinGroup(InetAddress groupAddr)</CODE>
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* method:
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* <PRE>
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* // join a Multicast group and send the group salutations
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* ...
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* String msg = "Hello";
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* InetAddress group = InetAddress.getByName("228.5.6.7");
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* MulticastSocket s = new MulticastSocket(6789);
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* s.joinGroup(group);
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* DatagramPacket hi = new DatagramPacket(msg.getBytes(), msg.length(),
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* group, 6789);
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* s.send(hi);
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* // get their responses!
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* byte[] buf = new byte[1000];
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* DatagramPacket recv = new DatagramPacket(buf, buf.length);
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* s.receive(recv);
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* ...
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* // OK, I'm done talking - leave the group...
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* s.leaveGroup(group);
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* </PRE>
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*
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* When one sends a message to a multicast group, <B>all</B> subscribing
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* recipients to that host and port receive the message (within the
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* time-to-live range of the packet, see below). The socket needn't
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* be a member of the multicast group to send messages to it.
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* <P>
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* When a socket subscribes to a multicast group/port, it receives
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* datagrams sent by other hosts to the group/port, as do all other
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* members of the group and port. A socket relinquishes membership
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* in a group by the leaveGroup(InetAddress addr) method. <B>
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* Multiple MulticastSocket's</B> may subscribe to a multicast group
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* and port concurrently, and they will all receive group datagrams.
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* <P>
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* Currently applets are not allowed to use multicast sockets.
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*
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* @author Pavani Diwanji
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* @since JDK1.1
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*/
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public
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class MulticastSocket extends DatagramSocket {
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/**
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* Create a multicast socket.
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*
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* <p>If there is a security manager,
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* its <code>checkListen</code> method is first called
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* with 0 as its argument to ensure the operation is allowed.
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* This could result in a SecurityException.
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* <p>
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* When the socket is created the
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* {@link DatagramSocket#setReuseAddress(boolean)} method is
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* called to enable the SO_REUSEADDR socket option.
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*
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* @exception IOException if an I/O exception occurs
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* while creating the MulticastSocket
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* @exception SecurityException if a security manager exists and its
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* <code>checkListen</code> method doesn't allow the operation.
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* @see SecurityManager#checkListen
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* @see java.net.DatagramSocket#setReuseAddress(boolean)
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*/
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public MulticastSocket() throws IOException {
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this(new InetSocketAddress(0));
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}
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/**
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* Create a multicast socket and bind it to a specific port.
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*
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* <p>If there is a security manager,
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* its <code>checkListen</code> method is first called
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* with the <code>port</code> argument
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* as its argument to ensure the operation is allowed.
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* This could result in a SecurityException.
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* <p>
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* When the socket is created the
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* {@link DatagramSocket#setReuseAddress(boolean)} method is
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* called to enable the SO_REUSEADDR socket option.
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*
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* @param port port to use
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* @exception IOException if an I/O exception occurs
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* while creating the MulticastSocket
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* @exception SecurityException if a security manager exists and its
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* <code>checkListen</code> method doesn't allow the operation.
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* @see SecurityManager#checkListen
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* @see java.net.DatagramSocket#setReuseAddress(boolean)
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*/
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public MulticastSocket(int port) throws IOException {
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this(new InetSocketAddress(port));
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}
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/**
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* Create a MulticastSocket bound to the specified socket address.
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* <p>
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* Or, if the address is <code>null</code>, create an unbound socket.
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* <p>
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* <p>If there is a security manager,
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* its <code>checkListen</code> method is first called
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* with the SocketAddress port as its argument to ensure the operation is allowed.
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* This could result in a SecurityException.
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* <p>
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* When the socket is created the
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* {@link DatagramSocket#setReuseAddress(boolean)} method is
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* called to enable the SO_REUSEADDR socket option.
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*
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* @param bindaddr Socket address to bind to, or <code>null</code> for
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* an unbound socket.
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* @exception IOException if an I/O exception occurs
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* while creating the MulticastSocket
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* @exception SecurityException if a security manager exists and its
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* <code>checkListen</code> method doesn't allow the operation.
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* @see SecurityManager#checkListen
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* @see java.net.DatagramSocket#setReuseAddress(boolean)
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*
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* @since 1.4
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*/
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public MulticastSocket(SocketAddress bindaddr) throws IOException {
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super((SocketAddress) null);
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// Enable SO_REUSEADDR before binding
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setReuseAddress(true);
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if (bindaddr != null) {
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bind(bindaddr);
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}
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}
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/**
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* The lock on the socket's TTL. This is for set/getTTL and
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* send(packet,ttl).
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*/
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private Object ttlLock = new Object();
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/**
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* The lock on the socket's interface - used by setInterface
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* and getInterface
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*/
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private Object infLock = new Object();
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/**
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* The "last" interface set by setInterface on this MulticastSocket
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*/
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private InetAddress infAddress = null;
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/**
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* Set the default time-to-live for multicast packets sent out
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* on this <code>MulticastSocket</code> in order to control the
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* scope of the multicasts.
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*
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* <p>The ttl is an <b>unsigned</b> 8-bit quantity, and so <B>must</B> be
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* in the range <code> 0 <= ttl <= 0xFF </code>.
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*
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* @param ttl the time-to-live
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* @exception IOException if an I/O exception occurs
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* while setting the default time-to-live value
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* @deprecated use the setTimeToLive method instead, which uses
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* <b>int</b> instead of <b>byte</b> as the type for ttl.
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* @see #getTTL()
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*/
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@Deprecated
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public void setTTL(byte ttl) throws IOException {
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if (isClosed())
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throw new SocketException("Socket is closed");
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getImpl().setTTL(ttl);
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}
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/**
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* Set the default time-to-live for multicast packets sent out
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* on this {@code MulticastSocket} in order to control the
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* scope of the multicasts.
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*
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* <P> The ttl <B>must</B> be in the range {@code 0 <= ttl <=
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* 255} or an {@code IllegalArgumentException} will be thrown.
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* Multicast packets sent with a TTL of {@code 0} are not transmitted
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* on the network but may be delivered locally.
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*
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* @param ttl
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* the time-to-live
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*
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* @throws IOException
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* if an I/O exception occurs while setting the
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* default time-to-live value
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*
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* @see #getTimeToLive()
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*/
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public void setTimeToLive(int ttl) throws IOException {
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if (ttl < 0 || ttl > 255) {
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throw new IllegalArgumentException("ttl out of range");
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}
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if (isClosed())
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throw new SocketException("Socket is closed");
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getImpl().setTimeToLive(ttl);
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}
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/**
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* Get the default time-to-live for multicast packets sent out on
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* the socket.
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*
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* @exception IOException if an I/O exception occurs
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* while getting the default time-to-live value
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* @return the default time-to-live value
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* @deprecated use the getTimeToLive method instead, which returns
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* an <b>int</b> instead of a <b>byte</b>.
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* @see #setTTL(byte)
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*/
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@Deprecated
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public byte getTTL() throws IOException {
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if (isClosed())
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throw new SocketException("Socket is closed");
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return getImpl().getTTL();
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}
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/**
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* Get the default time-to-live for multicast packets sent out on
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* the socket.
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* @exception IOException if an I/O exception occurs while
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* getting the default time-to-live value
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* @return the default time-to-live value
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* @see #setTimeToLive(int)
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*/
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public int getTimeToLive() throws IOException {
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if (isClosed())
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throw new SocketException("Socket is closed");
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return getImpl().getTimeToLive();
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}
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/**
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* Joins a multicast group. Its behavior may be affected by
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* <code>setInterface</code> or <code>setNetworkInterface</code>.
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*
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* <p>If there is a security manager, this method first
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* calls its <code>checkMulticast</code> method
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* with the <code>mcastaddr</code> argument
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* as its argument.
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*
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* @param mcastaddr is the multicast address to join
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*
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* @exception IOException if there is an error joining
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* or when the address is not a multicast address.
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* @exception SecurityException if a security manager exists and its
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* <code>checkMulticast</code> method doesn't allow the join.
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*
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* @see SecurityManager#checkMulticast(InetAddress)
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*/
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public void joinGroup(InetAddress mcastaddr) throws IOException {
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if (isClosed()) {
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throw new SocketException("Socket is closed");
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}
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SecurityManager security = System.getSecurityManager();
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if (security != null) {
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security.checkMulticast(mcastaddr);
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}
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if (!mcastaddr.isMulticastAddress()) {
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throw new SocketException("Not a multicast address");
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}
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getImpl().join(mcastaddr);
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}
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/**
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* Leave a multicast group. Its behavior may be affected by
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* <code>setInterface</code> or <code>setNetworkInterface</code>.
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*
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* <p>If there is a security manager, this method first
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* calls its <code>checkMulticast</code> method
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* with the <code>mcastaddr</code> argument
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* as its argument.
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*
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* @param mcastaddr is the multicast address to leave
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* @exception IOException if there is an error leaving
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* or when the address is not a multicast address.
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* @exception SecurityException if a security manager exists and its
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* <code>checkMulticast</code> method doesn't allow the operation.
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*
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* @see SecurityManager#checkMulticast(InetAddress)
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*/
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public void leaveGroup(InetAddress mcastaddr) throws IOException {
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if (isClosed()) {
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throw new SocketException("Socket is closed");
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}
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SecurityManager security = System.getSecurityManager();
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if (security != null) {
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security.checkMulticast(mcastaddr);
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}
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if (!mcastaddr.isMulticastAddress()) {
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throw new SocketException("Not a multicast address");
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}
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getImpl().leave(mcastaddr);
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}
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/**
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* Joins the specified multicast group at the specified interface.
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*
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* <p>If there is a security manager, this method first
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* calls its <code>checkMulticast</code> method
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* with the <code>mcastaddr</code> argument
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* as its argument.
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*
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* @param mcastaddr is the multicast address to join
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* @param netIf specifies the local interface to receive multicast
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* datagram packets, or <i>null</i> to defer to the interface set by
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* {@link MulticastSocket#setInterface(InetAddress)} or
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* {@link MulticastSocket#setNetworkInterface(NetworkInterface)}
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*
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* @exception IOException if there is an error joining
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353 |
* or when the address is not a multicast address.
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* @exception SecurityException if a security manager exists and its
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* <code>checkMulticast</code> method doesn't allow the join.
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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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*
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* @see SecurityManager#checkMulticast(InetAddress)
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|
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* @since 1.4
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|
361 |
*/
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362 |
public void joinGroup(SocketAddress mcastaddr, NetworkInterface netIf)
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|
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throws IOException {
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|
364 |
if (isClosed())
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throw new SocketException("Socket is closed");
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366 |
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367 |
if (mcastaddr == null || !(mcastaddr instanceof InetSocketAddress))
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368 |
throw new IllegalArgumentException("Unsupported address type");
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369 |
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370 |
if (oldImpl)
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|
371 |
throw new UnsupportedOperationException();
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|
372 |
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|
373 |
SecurityManager security = System.getSecurityManager();
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|
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if (security != null) {
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|
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security.checkMulticast(((InetSocketAddress)mcastaddr).getAddress());
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|
376 |
}
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377 |
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|
378 |
if (!((InetSocketAddress)mcastaddr).getAddress().isMulticastAddress()) {
|
|
379 |
throw new SocketException("Not a multicast address");
|
|
380 |
}
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|
381 |
|
|
382 |
getImpl().joinGroup(mcastaddr, netIf);
|
|
383 |
}
|
|
384 |
|
|
385 |
/**
|
|
386 |
* Leave a multicast group on a specified local interface.
|
|
387 |
*
|
|
388 |
* <p>If there is a security manager, this method first
|
|
389 |
* calls its <code>checkMulticast</code> method
|
|
390 |
* with the <code>mcastaddr</code> argument
|
|
391 |
* as its argument.
|
|
392 |
*
|
|
393 |
* @param mcastaddr is the multicast address to leave
|
|
394 |
* @param netIf specifies the local interface or <i>null</i> to defer
|
|
395 |
* to the interface set by
|
|
396 |
* {@link MulticastSocket#setInterface(InetAddress)} or
|
|
397 |
* {@link MulticastSocket#setNetworkInterface(NetworkInterface)}
|
|
398 |
* @exception IOException if there is an error leaving
|
|
399 |
* or when the address is not a multicast address.
|
|
400 |
* @exception SecurityException if a security manager exists and its
|
|
401 |
* <code>checkMulticast</code> method doesn't allow the operation.
|
|
402 |
* @throws IllegalArgumentException if mcastaddr is null or is a
|
|
403 |
* SocketAddress subclass not supported by this socket
|
|
404 |
*
|
|
405 |
* @see SecurityManager#checkMulticast(InetAddress)
|
|
406 |
* @since 1.4
|
|
407 |
*/
|
|
408 |
public void leaveGroup(SocketAddress mcastaddr, NetworkInterface netIf)
|
|
409 |
throws IOException {
|
|
410 |
if (isClosed())
|
|
411 |
throw new SocketException("Socket is closed");
|
|
412 |
|
|
413 |
if (mcastaddr == null || !(mcastaddr instanceof InetSocketAddress))
|
|
414 |
throw new IllegalArgumentException("Unsupported address type");
|
|
415 |
|
|
416 |
if (oldImpl)
|
|
417 |
throw new UnsupportedOperationException();
|
|
418 |
|
|
419 |
SecurityManager security = System.getSecurityManager();
|
|
420 |
if (security != null) {
|
|
421 |
security.checkMulticast(((InetSocketAddress)mcastaddr).getAddress());
|
|
422 |
}
|
|
423 |
|
|
424 |
if (!((InetSocketAddress)mcastaddr).getAddress().isMulticastAddress()) {
|
|
425 |
throw new SocketException("Not a multicast address");
|
|
426 |
}
|
|
427 |
|
|
428 |
getImpl().leaveGroup(mcastaddr, netIf);
|
|
429 |
}
|
|
430 |
|
|
431 |
/**
|
|
432 |
* Set the multicast network interface used by methods
|
|
433 |
* whose behavior would be affected by the value of the
|
|
434 |
* network interface. Useful for multihomed hosts.
|
|
435 |
* @param inf the InetAddress
|
|
436 |
* @exception SocketException if there is an error in
|
|
437 |
* the underlying protocol, such as a TCP error.
|
|
438 |
* @see #getInterface()
|
|
439 |
*/
|
|
440 |
public void setInterface(InetAddress inf) throws SocketException {
|
|
441 |
if (isClosed()) {
|
|
442 |
throw new SocketException("Socket is closed");
|
|
443 |
}
|
|
444 |
synchronized (infLock) {
|
|
445 |
getImpl().setOption(SocketOptions.IP_MULTICAST_IF, inf);
|
|
446 |
infAddress = inf;
|
|
447 |
}
|
|
448 |
}
|
|
449 |
|
|
450 |
/**
|
|
451 |
* Retrieve the address of the network interface used for
|
|
452 |
* multicast packets.
|
|
453 |
*
|
|
454 |
* @return An <code>InetAddress</code> representing
|
|
455 |
* the address of the network interface used for
|
|
456 |
* multicast packets.
|
|
457 |
*
|
|
458 |
* @exception SocketException if there is an error in
|
|
459 |
* the underlying protocol, such as a TCP error.
|
|
460 |
*
|
|
461 |
* @see #setInterface(java.net.InetAddress)
|
|
462 |
*/
|
|
463 |
public InetAddress getInterface() throws SocketException {
|
|
464 |
if (isClosed()) {
|
|
465 |
throw new SocketException("Socket is closed");
|
|
466 |
}
|
|
467 |
synchronized (infLock) {
|
|
468 |
InetAddress ia =
|
|
469 |
(InetAddress)getImpl().getOption(SocketOptions.IP_MULTICAST_IF);
|
|
470 |
|
|
471 |
/**
|
|
472 |
* No previous setInterface or interface can be
|
|
473 |
* set using setNetworkInterface
|
|
474 |
*/
|
|
475 |
if (infAddress == null) {
|
|
476 |
return ia;
|
|
477 |
}
|
|
478 |
|
|
479 |
/**
|
|
480 |
* Same interface set with setInterface?
|
|
481 |
*/
|
|
482 |
if (ia.equals(infAddress)) {
|
|
483 |
return ia;
|
|
484 |
}
|
|
485 |
|
|
486 |
/**
|
|
487 |
* Different InetAddress from what we set with setInterface
|
|
488 |
* so enumerate the current interface to see if the
|
|
489 |
* address set by setInterface is bound to this interface.
|
|
490 |
*/
|
|
491 |
try {
|
|
492 |
NetworkInterface ni = NetworkInterface.getByInetAddress(ia);
|
|
493 |
Enumeration addrs = ni.getInetAddresses();
|
|
494 |
while (addrs.hasMoreElements()) {
|
|
495 |
InetAddress addr = (InetAddress)(addrs.nextElement());
|
|
496 |
if (addr.equals(infAddress)) {
|
|
497 |
return infAddress;
|
|
498 |
}
|
|
499 |
}
|
|
500 |
|
|
501 |
/**
|
|
502 |
* No match so reset infAddress to indicate that the
|
|
503 |
* interface has changed via means
|
|
504 |
*/
|
|
505 |
infAddress = null;
|
|
506 |
return ia;
|
|
507 |
} catch (Exception e) {
|
|
508 |
return ia;
|
|
509 |
}
|
|
510 |
}
|
|
511 |
}
|
|
512 |
|
|
513 |
/**
|
|
514 |
* Specify the network interface for outgoing multicast datagrams
|
|
515 |
* sent on this socket.
|
|
516 |
*
|
|
517 |
* @param netIf the interface
|
|
518 |
* @exception SocketException if there is an error in
|
|
519 |
* the underlying protocol, such as a TCP error.
|
|
520 |
* @see #getNetworkInterface()
|
|
521 |
* @since 1.4
|
|
522 |
*/
|
|
523 |
public void setNetworkInterface(NetworkInterface netIf)
|
|
524 |
throws SocketException {
|
|
525 |
|
|
526 |
synchronized (infLock) {
|
|
527 |
getImpl().setOption(SocketOptions.IP_MULTICAST_IF2, netIf);
|
|
528 |
infAddress = null;
|
|
529 |
}
|
|
530 |
}
|
|
531 |
|
|
532 |
/**
|
|
533 |
* Get the multicast network interface set.
|
|
534 |
*
|
|
535 |
* @exception SocketException if there is an error in
|
|
536 |
* the underlying protocol, such as a TCP error.
|
|
537 |
* @return the multicast <code>NetworkInterface</code> currently set
|
|
538 |
* @see #setNetworkInterface(NetworkInterface)
|
|
539 |
* @since 1.4
|
|
540 |
*/
|
|
541 |
public NetworkInterface getNetworkInterface() throws SocketException {
|
|
542 |
NetworkInterface ni
|
|
543 |
= (NetworkInterface)getImpl().getOption(SocketOptions.IP_MULTICAST_IF2);
|
|
544 |
if (ni.getIndex() == 0) {
|
|
545 |
InetAddress[] addrs = new InetAddress[1];
|
|
546 |
addrs[0] = InetAddress.anyLocalAddress();
|
|
547 |
return new NetworkInterface(addrs[0].getHostName(), 0, addrs);
|
|
548 |
} else {
|
|
549 |
return ni;
|
|
550 |
}
|
|
551 |
}
|
|
552 |
|
|
553 |
/**
|
|
554 |
* Disable/Enable local loopback of multicast datagrams
|
|
555 |
* The option is used by the platform's networking code as a hint
|
|
556 |
* for setting whether multicast data will be looped back to
|
|
557 |
* the local socket.
|
|
558 |
*
|
|
559 |
* <p>Because this option is a hint, applications that want to
|
|
560 |
* verify what loopback mode is set to should call
|
|
561 |
* {@link #getLoopbackMode()}
|
|
562 |
* @param disable <code>true</code> to disable the LoopbackMode
|
|
563 |
* @throws SocketException if an error occurs while setting the value
|
|
564 |
* @since 1.4
|
|
565 |
* @see #getLoopbackMode
|
|
566 |
*/
|
|
567 |
public void setLoopbackMode(boolean disable) throws SocketException {
|
|
568 |
getImpl().setOption(SocketOptions.IP_MULTICAST_LOOP, Boolean.valueOf(disable));
|
|
569 |
}
|
|
570 |
|
|
571 |
/**
|
|
572 |
* Get the setting for local loopback of multicast datagrams.
|
|
573 |
*
|
|
574 |
* @throws SocketException if an error occurs while getting the value
|
|
575 |
* @return true if the LoopbackMode has been disabled
|
|
576 |
* @since 1.4
|
|
577 |
* @see #setLoopbackMode
|
|
578 |
*/
|
|
579 |
public boolean getLoopbackMode() throws SocketException {
|
|
580 |
return ((Boolean)getImpl().getOption(SocketOptions.IP_MULTICAST_LOOP)).booleanValue();
|
|
581 |
}
|
|
582 |
|
|
583 |
/**
|
|
584 |
* Sends a datagram packet to the destination, with a TTL (time-
|
|
585 |
* to-live) other than the default for the socket. This method
|
|
586 |
* need only be used in instances where a particular TTL is desired;
|
|
587 |
* otherwise it is preferable to set a TTL once on the socket, and
|
|
588 |
* use that default TTL for all packets. This method does <B>not
|
|
589 |
* </B> alter the default TTL for the socket. Its behavior may be
|
|
590 |
* affected by <code>setInterface</code>.
|
|
591 |
*
|
|
592 |
* <p>If there is a security manager, this method first performs some
|
|
593 |
* security checks. First, if <code>p.getAddress().isMulticastAddress()</code>
|
|
594 |
* is true, this method calls the
|
|
595 |
* security manager's <code>checkMulticast</code> method
|
|
596 |
* with <code>p.getAddress()</code> and <code>ttl</code> as its arguments.
|
|
597 |
* If the evaluation of that expression is false,
|
|
598 |
* this method instead calls the security manager's
|
|
599 |
* <code>checkConnect</code> method with arguments
|
|
600 |
* <code>p.getAddress().getHostAddress()</code> and
|
|
601 |
* <code>p.getPort()</code>. Each call to a security manager method
|
|
602 |
* could result in a SecurityException if the operation is not allowed.
|
|
603 |
*
|
|
604 |
* @param p is the packet to be sent. The packet should contain
|
|
605 |
* the destination multicast ip address and the data to be sent.
|
|
606 |
* One does not need to be the member of the group to send
|
|
607 |
* packets to a destination multicast address.
|
|
608 |
* @param ttl optional time to live for multicast packet.
|
|
609 |
* default ttl is 1.
|
|
610 |
*
|
|
611 |
* @exception IOException is raised if an error occurs i.e
|
|
612 |
* error while setting ttl.
|
|
613 |
* @exception SecurityException if a security manager exists and its
|
|
614 |
* <code>checkMulticast</code> or <code>checkConnect</code>
|
|
615 |
* method doesn't allow the send.
|
|
616 |
*
|
|
617 |
* @deprecated Use the following code or its equivalent instead:
|
|
618 |
* ......
|
|
619 |
* int ttl = mcastSocket.getTimeToLive();
|
|
620 |
* mcastSocket.setTimeToLive(newttl);
|
|
621 |
* mcastSocket.send(p);
|
|
622 |
* mcastSocket.setTimeToLive(ttl);
|
|
623 |
* ......
|
|
624 |
*
|
|
625 |
* @see DatagramSocket#send
|
|
626 |
* @see DatagramSocket#receive
|
|
627 |
* @see SecurityManager#checkMulticast(java.net.InetAddress, byte)
|
|
628 |
* @see SecurityManager#checkConnect
|
|
629 |
*/
|
|
630 |
@Deprecated
|
|
631 |
public void send(DatagramPacket p, byte ttl)
|
|
632 |
throws IOException {
|
|
633 |
if (isClosed())
|
|
634 |
throw new SocketException("Socket is closed");
|
|
635 |
synchronized(ttlLock) {
|
|
636 |
synchronized(p) {
|
|
637 |
if (connectState == ST_NOT_CONNECTED) {
|
|
638 |
// Security manager makes sure that the multicast address
|
|
639 |
// is allowed one and that the ttl used is less
|
|
640 |
// than the allowed maxttl.
|
|
641 |
SecurityManager security = System.getSecurityManager();
|
|
642 |
if (security != null) {
|
|
643 |
if (p.getAddress().isMulticastAddress()) {
|
|
644 |
security.checkMulticast(p.getAddress(), ttl);
|
|
645 |
} else {
|
|
646 |
security.checkConnect(p.getAddress().getHostAddress(),
|
|
647 |
p.getPort());
|
|
648 |
}
|
|
649 |
}
|
|
650 |
} else {
|
|
651 |
// we're connected
|
|
652 |
InetAddress packetAddress = null;
|
|
653 |
packetAddress = p.getAddress();
|
|
654 |
if (packetAddress == null) {
|
|
655 |
p.setAddress(connectedAddress);
|
|
656 |
p.setPort(connectedPort);
|
|
657 |
} else if ((!packetAddress.equals(connectedAddress)) ||
|
|
658 |
p.getPort() != connectedPort) {
|
|
659 |
throw new SecurityException("connected address and packet address" +
|
|
660 |
" differ");
|
|
661 |
}
|
|
662 |
}
|
|
663 |
byte dttl = getTTL();
|
|
664 |
try {
|
|
665 |
if (ttl != dttl) {
|
|
666 |
// set the ttl
|
|
667 |
getImpl().setTTL(ttl);
|
|
668 |
}
|
|
669 |
// call the datagram method to send
|
|
670 |
getImpl().send(p);
|
|
671 |
} finally {
|
|
672 |
// set it back to default
|
|
673 |
if (ttl != dttl) {
|
|
674 |
getImpl().setTTL(dttl);
|
|
675 |
}
|
|
676 |
}
|
|
677 |
} // synch p
|
|
678 |
} //synch ttl
|
|
679 |
} //method
|
|
680 |
}
|