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/*
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* Copyright 2007-2008 Sun Microsystems, Inc. All Rights Reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* - Neither the name of Sun Microsystems nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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import java.nio.channels.*;
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import java.nio.charset.*;
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import java.nio.ByteBuffer;
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import java.net.*;
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import java.io.IOException;
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import java.util.*;
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public class Reader {
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static void usage() {
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System.err.println("usage: java Reader group:port@interf [-only source...] [-block source...]");
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System.exit(-1);
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}
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static void printDatagram(SocketAddress sa, ByteBuffer buf) {
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System.out.format("-- datagram from %s --\n",
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((InetSocketAddress)sa).getAddress().getHostAddress());
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System.out.println(Charset.defaultCharset().decode(buf));
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}
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static void parseAddessList(String s, List<InetAddress> list)
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throws UnknownHostException
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{
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String[] sources = s.split(",");
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for (int i=0; i<sources.length; i++) {
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list.add(InetAddress.getByName(sources[i]));
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}
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}
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public static void main(String[] args) throws IOException {
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if (args.length == 0)
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usage();
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// first parameter is the multicast address (interface required)
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MulticastAddress target = MulticastAddress.parse(args[0]);
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if (target.interf() == null)
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usage();
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// addition arguments are source addresses to include or exclude
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List<InetAddress> includeList = new ArrayList<InetAddress>();
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List<InetAddress> excludeList = new ArrayList<InetAddress>();
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int argc = 1;
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while (argc < args.length) {
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String option = args[argc++];
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if (argc >= args.length)
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usage();
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String value = args[argc++];
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if (option.equals("-only")) {
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parseAddessList(value, includeList);
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continue;
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}
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if (option.equals("-block")) {
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parseAddessList(value, excludeList);
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continue;
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}
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usage();
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}
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if (!includeList.isEmpty() && !excludeList.isEmpty()) {
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usage();
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}
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// create and bind socket
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ProtocolFamily family = StandardProtocolFamily.INET;
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if (target.group() instanceof Inet6Address) {
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family = StandardProtocolFamily.INET6;
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}
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DatagramChannel dc = DatagramChannel.open(family)
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.setOption(StandardSocketOption.SO_REUSEADDR, true)
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.bind(new InetSocketAddress(target.port()));
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if (includeList.isEmpty()) {
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// join group and block addresses on the exclude list
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MembershipKey key = dc.join(target.group(), target.interf());
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for (InetAddress source: excludeList) {
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key.block(source);
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}
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} else {
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// join with source-specific membership for each source
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for (InetAddress source: includeList) {
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dc.join(target.group(), target.interf(), source);
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}
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}
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// register socket with Selector
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Selector sel = Selector.open();
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dc.configureBlocking(false);
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dc.register(sel, SelectionKey.OP_READ);
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// print out each datagram that we receive
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ByteBuffer buf = ByteBuffer.allocateDirect(4096);
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for (;;) {
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int updated = sel.select();
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if (updated > 0) {
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Iterator<SelectionKey> iter = sel.selectedKeys().iterator();
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while (iter.hasNext()) {
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SelectionKey sk = iter.next();
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iter.remove();
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DatagramChannel ch = (DatagramChannel)sk.channel();
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SocketAddress sa = ch.receive(buf);
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if (sa != null) {
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buf.flip();
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printDatagram(sa, buf);
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buf.rewind();
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buf.limit(buf.capacity());
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}
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}
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}
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}
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}
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}
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