| /* |
| * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| package sun.management.jdp; |
| |
| import java.io.IOException; |
| import java.net.Inet6Address; |
| import java.net.InetAddress; |
| import java.net.InetSocketAddress; |
| import java.net.NetworkInterface; |
| import java.net.ProtocolFamily; |
| import java.net.StandardProtocolFamily; |
| import java.net.StandardSocketOptions; |
| import java.nio.ByteBuffer; |
| import java.nio.channels.DatagramChannel; |
| import java.nio.channels.UnsupportedAddressTypeException; |
| |
| /** |
| * JdpBroadcaster is responsible for sending pre-built JDP packet across a Net |
| * |
| * <p> Multicast group address, port number and ttl have to be chosen on upper |
| * level and passed to broadcaster constructor. Also it's possible to specify |
| * source address to broadcast from. </p> |
| * |
| * <p>JdpBradcaster doesn't perform any validation on a supplied {@code port} and {@code ttl} because |
| * the allowed values depend on an operating system setup</p> |
| * |
| */ |
| public final class JdpBroadcaster { |
| |
| private final InetAddress addr; |
| private final int port; |
| private final DatagramChannel channel; |
| |
| /** |
| * Create a new broadcaster |
| * |
| * @param address - multicast group address |
| * @param srcAddress - address of interface we should use to broadcast. |
| * @param port - udp port to use |
| * @param ttl - packet ttl |
| * @throws IOException |
| */ |
| public JdpBroadcaster(InetAddress address, InetAddress srcAddress, int port, int ttl) |
| throws IOException, JdpException { |
| this.addr = address; |
| this.port = port; |
| |
| ProtocolFamily family = (address instanceof Inet6Address) |
| ? StandardProtocolFamily.INET6 : StandardProtocolFamily.INET; |
| |
| channel = DatagramChannel.open(family); |
| channel.setOption(StandardSocketOptions.SO_REUSEADDR, true); |
| channel.setOption(StandardSocketOptions.IP_MULTICAST_TTL, ttl); |
| |
| // with srcAddress equal to null, this constructor do exactly the same as |
| // if srcAddress is not passed |
| if (srcAddress != null) { |
| // User requests particular interface to bind to |
| NetworkInterface interf = NetworkInterface.getByInetAddress(srcAddress); |
| try { |
| channel.bind(new InetSocketAddress(srcAddress, 0)); |
| } catch (UnsupportedAddressTypeException ex) { |
| throw new JdpException("Unable to bind to source address"); |
| } |
| channel.setOption(StandardSocketOptions.IP_MULTICAST_IF, interf); |
| } |
| } |
| |
| /** |
| * Create a new broadcaster |
| * |
| * @param address - multicast group address |
| * @param port - udp port to use |
| * @param ttl - packet ttl |
| * @throws IOException |
| */ |
| public JdpBroadcaster(InetAddress address, int port, int ttl) |
| throws IOException, JdpException { |
| this(address, null, port, ttl); |
| } |
| |
| /** |
| * Broadcast pre-built packet |
| * |
| * @param packet - instance of JdpPacket |
| * @throws IOException |
| */ |
| public void sendPacket(JdpPacket packet) |
| throws IOException { |
| byte[] data = packet.getPacketData(); |
| // Unlike allocate/put wrap don't need a flip afterward |
| ByteBuffer b = ByteBuffer.wrap(data); |
| channel.send(b, new InetSocketAddress(addr, port)); |
| } |
| |
| /** |
| * Shutdown broadcaster and close underlying socket channel |
| * |
| * @throws IOException |
| */ |
| public void shutdown() throws IOException { |
| channel.close(); |
| } |
| } |