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/*
* Copyright (C) 2008-2017, Juick
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package com.juick.server.xmpp.s2s;
import org.apache.commons.lang3.math.NumberUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.net.InetSocketAddress;
import java.util.Hashtable;
import java.util.Random;
import javax.naming.NamingException;
import javax.naming.directory.Attribute;
import javax.naming.directory.DirContext;
import javax.naming.directory.InitialDirContext;
/**
*
* @author ugnich
*/
public class DNSQueries {
private static final Logger logger = LoggerFactory.getLogger(DNSQueries.class);
private static Random rand = new Random();
public static InetSocketAddress getServerAddress(String hostname) {
String host = hostname;
int port = 5269;
Hashtable<String, String> env = new Hashtable<>(5);
env.put("java.naming.factory.initial", "com.sun.jndi.dns.DnsContextFactory");
try {
DirContext ctx = new InitialDirContext(env);
Attribute att = ctx.getAttributes("_xmpp-server._tcp." + hostname, new String[]{"SRV"}).get("SRV");
if (att != null && att.size() > 0) {
int i = rand.nextInt(att.size());
String srv[] = att.get(i).toString().split(" ");
port = NumberUtils.toInt(srv[2], 5269);
host = srv[3];
}
ctx.close();
} catch (NamingException e) {
logger.info("SRV record for {} is not resolved, falling back to A record", hostname);
}
return new InetSocketAddress(host, port);
}
}
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