author | chegar |
Thu, 01 Sep 2011 13:53:59 +0100 | |
changeset 10422 | 83581a2cf49d |
parent 5506 | 202f599c92aa |
child 10437 | dfca69ed7f87 |
permissions | -rw-r--r-- |
2 | 1 |
/* |
5506 | 2 |
* Copyright (c) 1995, 2007, Oracle and/or its affiliates. All rights reserved. |
2 | 3 |
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 |
* |
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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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5506 | 7 |
* published by the Free Software Foundation. Oracle designates this |
2 | 8 |
* particular file as subject to the "Classpath" exception as provided |
5506 | 9 |
* by Oracle in the LICENSE file that accompanied this code. |
2 | 10 |
* |
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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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5506 | 21 |
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
22 |
* 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.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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42 |
* <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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51 |
* 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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203 |
public void setTTL(byte ttl) throws IOException { |
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if (isClosed()) |
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throw new SocketException("Socket is closed"); |
|
206 |
getImpl().setTTL(ttl); |
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} |
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||
209 |
/** |
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* Set the default time-to-live for multicast packets sent out |
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211 |
* 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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223 |
* 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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229 |
if (ttl < 0 || ttl > 255) { |
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throw new IllegalArgumentException("ttl out of range"); |
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} |
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232 |
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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||
237 |
/** |
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* Get the default time-to-live for multicast packets sent out on |
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239 |
* the socket. |
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* |
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241 |
* @exception IOException if an I/O exception occurs |
|
242 |
* while getting the default time-to-live value |
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243 |
* @return the default time-to-live value |
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244 |
* @deprecated use the getTimeToLive method instead, which returns |
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245 |
* an <b>int</b> instead of a <b>byte</b>. |
|
246 |
* @see #setTTL(byte) |
|
247 |
*/ |
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248 |
@Deprecated |
|
249 |
public byte getTTL() throws IOException { |
|
250 |
if (isClosed()) |
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251 |
throw new SocketException("Socket is closed"); |
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252 |
return getImpl().getTTL(); |
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} |
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||
255 |
/** |
|
256 |
* Get the default time-to-live for multicast packets sent out on |
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257 |
* the socket. |
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258 |
* @exception IOException if an I/O exception occurs while |
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259 |
* getting the default time-to-live value |
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260 |
* @return the default time-to-live value |
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261 |
* @see #setTimeToLive(int) |
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*/ |
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263 |
public int getTimeToLive() throws IOException { |
|
264 |
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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||
269 |
/** |
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270 |
* Joins a multicast group. Its behavior may be affected by |
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271 |
* <code>setInterface</code> or <code>setNetworkInterface</code>. |
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272 |
* |
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273 |
* <p>If there is a security manager, this method first |
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274 |
* 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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279 |
* |
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* @exception IOException if there is an error joining |
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281 |
* or when the address is not a multicast address. |
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282 |
* @exception SecurityException if a security manager exists and its |
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283 |
* <code>checkMulticast</code> method doesn't allow the join. |
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* |
|
285 |
* @see SecurityManager#checkMulticast(InetAddress) |
|
286 |
*/ |
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287 |
public void joinGroup(InetAddress mcastaddr) throws IOException { |
|
288 |
if (isClosed()) { |
|
289 |
throw new SocketException("Socket is closed"); |
|
290 |
} |
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5180
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6893954: Subclasses of InetAddress may incorrectly interpret network addresses
michaelm
parents:
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diff
changeset
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checkAddress(mcastaddr, "joinGroup"); |
2 | 293 |
SecurityManager security = System.getSecurityManager(); |
294 |
if (security != null) { |
|
295 |
security.checkMulticast(mcastaddr); |
|
296 |
} |
|
297 |
||
298 |
if (!mcastaddr.isMulticastAddress()) { |
|
299 |
throw new SocketException("Not a multicast address"); |
|
300 |
} |
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301 |
||
302 |
getImpl().join(mcastaddr); |
|
303 |
} |
|
304 |
||
305 |
/** |
|
306 |
* Leave a multicast group. Its behavior may be affected by |
|
307 |
* <code>setInterface</code> or <code>setNetworkInterface</code>. |
|
308 |
* |
|
309 |
* <p>If there is a security manager, this method first |
|
310 |
* calls its <code>checkMulticast</code> method |
|
311 |
* with the <code>mcastaddr</code> argument |
|
312 |
* as its argument. |
|
313 |
* |
|
314 |
* @param mcastaddr is the multicast address to leave |
|
315 |
* @exception IOException if there is an error leaving |
|
316 |
* or when the address is not a multicast address. |
|
317 |
* @exception SecurityException if a security manager exists and its |
|
318 |
* <code>checkMulticast</code> method doesn't allow the operation. |
|
319 |
* |
|
320 |
* @see SecurityManager#checkMulticast(InetAddress) |
|
321 |
*/ |
|
322 |
public void leaveGroup(InetAddress mcastaddr) throws IOException { |
|
323 |
if (isClosed()) { |
|
324 |
throw new SocketException("Socket is closed"); |
|
325 |
} |
|
326 |
||
5180
8161f879d704
6893954: Subclasses of InetAddress may incorrectly interpret network addresses
michaelm
parents:
2
diff
changeset
|
327 |
checkAddress(mcastaddr, "leaveGroup"); |
2 | 328 |
SecurityManager security = System.getSecurityManager(); |
329 |
if (security != null) { |
|
330 |
security.checkMulticast(mcastaddr); |
|
331 |
} |
|
332 |
||
333 |
if (!mcastaddr.isMulticastAddress()) { |
|
334 |
throw new SocketException("Not a multicast address"); |
|
335 |
} |
|
336 |
||
337 |
getImpl().leave(mcastaddr); |
|
338 |
} |
|
339 |
||
340 |
/** |
|
341 |
* Joins the specified multicast group at the specified interface. |
|
342 |
* |
|
343 |
* <p>If there is a security manager, this method first |
|
344 |
* calls its <code>checkMulticast</code> method |
|
345 |
* with the <code>mcastaddr</code> argument |
|
346 |
* as its argument. |
|
347 |
* |
|
348 |
* @param mcastaddr is the multicast address to join |
|
349 |
* @param netIf specifies the local interface to receive multicast |
|
350 |
* datagram packets, or <i>null</i> to defer to the interface set by |
|
351 |
* {@link MulticastSocket#setInterface(InetAddress)} or |
|
352 |
* {@link MulticastSocket#setNetworkInterface(NetworkInterface)} |
|
353 |
* |
|
354 |
* @exception IOException if there is an error joining |
|
355 |
* or when the address is not a multicast address. |
|
356 |
* @exception SecurityException if a security manager exists and its |
|
357 |
* <code>checkMulticast</code> method doesn't allow the join. |
|
358 |
* @throws IllegalArgumentException if mcastaddr is null or is a |
|
359 |
* SocketAddress subclass not supported by this socket |
|
360 |
* |
|
361 |
* @see SecurityManager#checkMulticast(InetAddress) |
|
362 |
* @since 1.4 |
|
363 |
*/ |
|
364 |
public void joinGroup(SocketAddress mcastaddr, NetworkInterface netIf) |
|
365 |
throws IOException { |
|
366 |
if (isClosed()) |
|
367 |
throw new SocketException("Socket is closed"); |
|
368 |
||
369 |
if (mcastaddr == null || !(mcastaddr instanceof InetSocketAddress)) |
|
370 |
throw new IllegalArgumentException("Unsupported address type"); |
|
371 |
||
372 |
if (oldImpl) |
|
373 |
throw new UnsupportedOperationException(); |
|
374 |
||
5180
8161f879d704
6893954: Subclasses of InetAddress may incorrectly interpret network addresses
michaelm
parents:
2
diff
changeset
|
375 |
checkAddress(((InetSocketAddress)mcastaddr).getAddress(), "joinGroup"); |
2 | 376 |
SecurityManager security = System.getSecurityManager(); |
377 |
if (security != null) { |
|
378 |
security.checkMulticast(((InetSocketAddress)mcastaddr).getAddress()); |
|
379 |
} |
|
380 |
||
381 |
if (!((InetSocketAddress)mcastaddr).getAddress().isMulticastAddress()) { |
|
382 |
throw new SocketException("Not a multicast address"); |
|
383 |
} |
|
384 |
||
385 |
getImpl().joinGroup(mcastaddr, netIf); |
|
386 |
} |
|
387 |
||
388 |
/** |
|
389 |
* Leave a multicast group on a specified local interface. |
|
390 |
* |
|
391 |
* <p>If there is a security manager, this method first |
|
392 |
* calls its <code>checkMulticast</code> method |
|
393 |
* with the <code>mcastaddr</code> argument |
|
394 |
* as its argument. |
|
395 |
* |
|
396 |
* @param mcastaddr is the multicast address to leave |
|
397 |
* @param netIf specifies the local interface or <i>null</i> to defer |
|
398 |
* to the interface set by |
|
399 |
* {@link MulticastSocket#setInterface(InetAddress)} or |
|
400 |
* {@link MulticastSocket#setNetworkInterface(NetworkInterface)} |
|
401 |
* @exception IOException if there is an error leaving |
|
402 |
* or when the address is not a multicast address. |
|
403 |
* @exception SecurityException if a security manager exists and its |
|
404 |
* <code>checkMulticast</code> method doesn't allow the operation. |
|
405 |
* @throws IllegalArgumentException if mcastaddr is null or is a |
|
406 |
* SocketAddress subclass not supported by this socket |
|
407 |
* |
|
408 |
* @see SecurityManager#checkMulticast(InetAddress) |
|
409 |
* @since 1.4 |
|
410 |
*/ |
|
411 |
public void leaveGroup(SocketAddress mcastaddr, NetworkInterface netIf) |
|
412 |
throws IOException { |
|
413 |
if (isClosed()) |
|
414 |
throw new SocketException("Socket is closed"); |
|
415 |
||
416 |
if (mcastaddr == null || !(mcastaddr instanceof InetSocketAddress)) |
|
417 |
throw new IllegalArgumentException("Unsupported address type"); |
|
418 |
||
419 |
if (oldImpl) |
|
420 |
throw new UnsupportedOperationException(); |
|
421 |
||
5180
8161f879d704
6893954: Subclasses of InetAddress may incorrectly interpret network addresses
michaelm
parents:
2
diff
changeset
|
422 |
checkAddress(((InetSocketAddress)mcastaddr).getAddress(), "leaveGroup"); |
2 | 423 |
SecurityManager security = System.getSecurityManager(); |
424 |
if (security != null) { |
|
425 |
security.checkMulticast(((InetSocketAddress)mcastaddr).getAddress()); |
|
426 |
} |
|
427 |
||
428 |
if (!((InetSocketAddress)mcastaddr).getAddress().isMulticastAddress()) { |
|
429 |
throw new SocketException("Not a multicast address"); |
|
430 |
} |
|
431 |
||
432 |
getImpl().leaveGroup(mcastaddr, netIf); |
|
433 |
} |
|
434 |
||
435 |
/** |
|
436 |
* Set the multicast network interface used by methods |
|
437 |
* whose behavior would be affected by the value of the |
|
438 |
* network interface. Useful for multihomed hosts. |
|
439 |
* @param inf the InetAddress |
|
440 |
* @exception SocketException if there is an error in |
|
441 |
* the underlying protocol, such as a TCP error. |
|
442 |
* @see #getInterface() |
|
443 |
*/ |
|
444 |
public void setInterface(InetAddress inf) throws SocketException { |
|
445 |
if (isClosed()) { |
|
446 |
throw new SocketException("Socket is closed"); |
|
447 |
} |
|
5180
8161f879d704
6893954: Subclasses of InetAddress may incorrectly interpret network addresses
michaelm
parents:
2
diff
changeset
|
448 |
checkAddress(inf, "setInterface"); |
2 | 449 |
synchronized (infLock) { |
450 |
getImpl().setOption(SocketOptions.IP_MULTICAST_IF, inf); |
|
451 |
infAddress = inf; |
|
452 |
} |
|
453 |
} |
|
454 |
||
455 |
/** |
|
456 |
* Retrieve the address of the network interface used for |
|
457 |
* multicast packets. |
|
458 |
* |
|
459 |
* @return An <code>InetAddress</code> representing |
|
460 |
* the address of the network interface used for |
|
461 |
* multicast packets. |
|
462 |
* |
|
463 |
* @exception SocketException if there is an error in |
|
464 |
* the underlying protocol, such as a TCP error. |
|
465 |
* |
|
466 |
* @see #setInterface(java.net.InetAddress) |
|
467 |
*/ |
|
468 |
public InetAddress getInterface() throws SocketException { |
|
469 |
if (isClosed()) { |
|
470 |
throw new SocketException("Socket is closed"); |
|
471 |
} |
|
472 |
synchronized (infLock) { |
|
473 |
InetAddress ia = |
|
474 |
(InetAddress)getImpl().getOption(SocketOptions.IP_MULTICAST_IF); |
|
475 |
||
476 |
/** |
|
477 |
* No previous setInterface or interface can be |
|
478 |
* set using setNetworkInterface |
|
479 |
*/ |
|
480 |
if (infAddress == null) { |
|
481 |
return ia; |
|
482 |
} |
|
483 |
||
484 |
/** |
|
485 |
* Same interface set with setInterface? |
|
486 |
*/ |
|
487 |
if (ia.equals(infAddress)) { |
|
488 |
return ia; |
|
489 |
} |
|
490 |
||
491 |
/** |
|
492 |
* Different InetAddress from what we set with setInterface |
|
493 |
* so enumerate the current interface to see if the |
|
494 |
* address set by setInterface is bound to this interface. |
|
495 |
*/ |
|
496 |
try { |
|
497 |
NetworkInterface ni = NetworkInterface.getByInetAddress(ia); |
|
498 |
Enumeration addrs = ni.getInetAddresses(); |
|
499 |
while (addrs.hasMoreElements()) { |
|
500 |
InetAddress addr = (InetAddress)(addrs.nextElement()); |
|
501 |
if (addr.equals(infAddress)) { |
|
502 |
return infAddress; |
|
503 |
} |
|
504 |
} |
|
505 |
||
506 |
/** |
|
507 |
* No match so reset infAddress to indicate that the |
|
508 |
* interface has changed via means |
|
509 |
*/ |
|
510 |
infAddress = null; |
|
511 |
return ia; |
|
512 |
} catch (Exception e) { |
|
513 |
return ia; |
|
514 |
} |
|
515 |
} |
|
516 |
} |
|
517 |
||
518 |
/** |
|
519 |
* Specify the network interface for outgoing multicast datagrams |
|
520 |
* sent on this socket. |
|
521 |
* |
|
522 |
* @param netIf the interface |
|
523 |
* @exception SocketException if there is an error in |
|
524 |
* the underlying protocol, such as a TCP error. |
|
525 |
* @see #getNetworkInterface() |
|
526 |
* @since 1.4 |
|
527 |
*/ |
|
528 |
public void setNetworkInterface(NetworkInterface netIf) |
|
529 |
throws SocketException { |
|
530 |
||
531 |
synchronized (infLock) { |
|
532 |
getImpl().setOption(SocketOptions.IP_MULTICAST_IF2, netIf); |
|
533 |
infAddress = null; |
|
534 |
} |
|
535 |
} |
|
536 |
||
537 |
/** |
|
538 |
* Get the multicast network interface set. |
|
539 |
* |
|
540 |
* @exception SocketException if there is an error in |
|
541 |
* the underlying protocol, such as a TCP error. |
|
542 |
* @return the multicast <code>NetworkInterface</code> currently set |
|
543 |
* @see #setNetworkInterface(NetworkInterface) |
|
544 |
* @since 1.4 |
|
545 |
*/ |
|
546 |
public NetworkInterface getNetworkInterface() throws SocketException { |
|
547 |
NetworkInterface ni |
|
548 |
= (NetworkInterface)getImpl().getOption(SocketOptions.IP_MULTICAST_IF2); |
|
549 |
if (ni.getIndex() == 0) { |
|
550 |
InetAddress[] addrs = new InetAddress[1]; |
|
551 |
addrs[0] = InetAddress.anyLocalAddress(); |
|
552 |
return new NetworkInterface(addrs[0].getHostName(), 0, addrs); |
|
553 |
} else { |
|
554 |
return ni; |
|
555 |
} |
|
556 |
} |
|
557 |
||
558 |
/** |
|
559 |
* Disable/Enable local loopback of multicast datagrams |
|
560 |
* The option is used by the platform's networking code as a hint |
|
561 |
* for setting whether multicast data will be looped back to |
|
562 |
* the local socket. |
|
563 |
* |
|
564 |
* <p>Because this option is a hint, applications that want to |
|
565 |
* verify what loopback mode is set to should call |
|
566 |
* {@link #getLoopbackMode()} |
|
567 |
* @param disable <code>true</code> to disable the LoopbackMode |
|
568 |
* @throws SocketException if an error occurs while setting the value |
|
569 |
* @since 1.4 |
|
570 |
* @see #getLoopbackMode |
|
571 |
*/ |
|
572 |
public void setLoopbackMode(boolean disable) throws SocketException { |
|
573 |
getImpl().setOption(SocketOptions.IP_MULTICAST_LOOP, Boolean.valueOf(disable)); |
|
574 |
} |
|
575 |
||
576 |
/** |
|
577 |
* Get the setting for local loopback of multicast datagrams. |
|
578 |
* |
|
579 |
* @throws SocketException if an error occurs while getting the value |
|
580 |
* @return true if the LoopbackMode has been disabled |
|
581 |
* @since 1.4 |
|
582 |
* @see #setLoopbackMode |
|
583 |
*/ |
|
584 |
public boolean getLoopbackMode() throws SocketException { |
|
585 |
return ((Boolean)getImpl().getOption(SocketOptions.IP_MULTICAST_LOOP)).booleanValue(); |
|
586 |
} |
|
587 |
||
588 |
/** |
|
589 |
* Sends a datagram packet to the destination, with a TTL (time- |
|
590 |
* to-live) other than the default for the socket. This method |
|
591 |
* need only be used in instances where a particular TTL is desired; |
|
592 |
* otherwise it is preferable to set a TTL once on the socket, and |
|
593 |
* use that default TTL for all packets. This method does <B>not |
|
594 |
* </B> alter the default TTL for the socket. Its behavior may be |
|
595 |
* affected by <code>setInterface</code>. |
|
596 |
* |
|
597 |
* <p>If there is a security manager, this method first performs some |
|
598 |
* security checks. First, if <code>p.getAddress().isMulticastAddress()</code> |
|
599 |
* is true, this method calls the |
|
600 |
* security manager's <code>checkMulticast</code> method |
|
601 |
* with <code>p.getAddress()</code> and <code>ttl</code> as its arguments. |
|
602 |
* If the evaluation of that expression is false, |
|
603 |
* this method instead calls the security manager's |
|
604 |
* <code>checkConnect</code> method with arguments |
|
605 |
* <code>p.getAddress().getHostAddress()</code> and |
|
606 |
* <code>p.getPort()</code>. Each call to a security manager method |
|
607 |
* could result in a SecurityException if the operation is not allowed. |
|
608 |
* |
|
609 |
* @param p is the packet to be sent. The packet should contain |
|
610 |
* the destination multicast ip address and the data to be sent. |
|
611 |
* One does not need to be the member of the group to send |
|
612 |
* packets to a destination multicast address. |
|
613 |
* @param ttl optional time to live for multicast packet. |
|
614 |
* default ttl is 1. |
|
615 |
* |
|
616 |
* @exception IOException is raised if an error occurs i.e |
|
617 |
* error while setting ttl. |
|
618 |
* @exception SecurityException if a security manager exists and its |
|
619 |
* <code>checkMulticast</code> or <code>checkConnect</code> |
|
620 |
* method doesn't allow the send. |
|
621 |
* |
|
622 |
* @deprecated Use the following code or its equivalent instead: |
|
623 |
* ...... |
|
624 |
* int ttl = mcastSocket.getTimeToLive(); |
|
625 |
* mcastSocket.setTimeToLive(newttl); |
|
626 |
* mcastSocket.send(p); |
|
627 |
* mcastSocket.setTimeToLive(ttl); |
|
628 |
* ...... |
|
629 |
* |
|
630 |
* @see DatagramSocket#send |
|
631 |
* @see DatagramSocket#receive |
|
632 |
* @see SecurityManager#checkMulticast(java.net.InetAddress, byte) |
|
633 |
* @see SecurityManager#checkConnect |
|
634 |
*/ |
|
635 |
@Deprecated |
|
636 |
public void send(DatagramPacket p, byte ttl) |
|
637 |
throws IOException { |
|
638 |
if (isClosed()) |
|
639 |
throw new SocketException("Socket is closed"); |
|
5180
8161f879d704
6893954: Subclasses of InetAddress may incorrectly interpret network addresses
michaelm
parents:
2
diff
changeset
|
640 |
checkAddress(p.getAddress(), "send"); |
2 | 641 |
synchronized(ttlLock) { |
642 |
synchronized(p) { |
|
643 |
if (connectState == ST_NOT_CONNECTED) { |
|
644 |
// Security manager makes sure that the multicast address |
|
645 |
// is allowed one and that the ttl used is less |
|
646 |
// than the allowed maxttl. |
|
647 |
SecurityManager security = System.getSecurityManager(); |
|
648 |
if (security != null) { |
|
649 |
if (p.getAddress().isMulticastAddress()) { |
|
650 |
security.checkMulticast(p.getAddress(), ttl); |
|
651 |
} else { |
|
652 |
security.checkConnect(p.getAddress().getHostAddress(), |
|
653 |
p.getPort()); |
|
654 |
} |
|
655 |
} |
|
656 |
} else { |
|
657 |
// we're connected |
|
658 |
InetAddress packetAddress = null; |
|
659 |
packetAddress = p.getAddress(); |
|
660 |
if (packetAddress == null) { |
|
661 |
p.setAddress(connectedAddress); |
|
662 |
p.setPort(connectedPort); |
|
663 |
} else if ((!packetAddress.equals(connectedAddress)) || |
|
664 |
p.getPort() != connectedPort) { |
|
665 |
throw new SecurityException("connected address and packet address" + |
|
666 |
" differ"); |
|
667 |
} |
|
668 |
} |
|
669 |
byte dttl = getTTL(); |
|
670 |
try { |
|
671 |
if (ttl != dttl) { |
|
672 |
// set the ttl |
|
673 |
getImpl().setTTL(ttl); |
|
674 |
} |
|
675 |
// call the datagram method to send |
|
676 |
getImpl().send(p); |
|
677 |
} finally { |
|
678 |
// set it back to default |
|
679 |
if (ttl != dttl) { |
|
680 |
getImpl().setTTL(dttl); |
|
681 |
} |
|
682 |
} |
|
683 |
} // synch p |
|
684 |
} //synch ttl |
|
685 |
} //method |
|
686 |
} |