/
NetworkUtils.java
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/
NetworkUtils.java
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/**
* OpenKM, Open Document Management System (http://www.openkm.com)
* Copyright (c) 2006-2017 Paco Avila & Josep Llort
* <p>
* No bytes were intentionally harmed during the development of this application.
* <p>
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
* <p>
* 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 General Public License for more details.
* <p>
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
package com.openkm.util;
import org.xbill.DNS.*;
import java.io.IOException;
import java.net.InetAddress;
import java.net.UnknownHostException;
public class NetworkUtils {
/**
* Get hostname
*/
public static String getHostname() {
try {
return InetAddress.getLocalHost().getCanonicalHostName();
} catch (UnknownHostException e) {
return "unknown";
}
}
public static String reverseDns(String hostIp) throws IOException {
Resolver res = new ExtendedResolver();
Name name = ReverseMap.fromAddress(hostIp);
int type = Type.PTR;
int dclass = DClass.IN;
Record rec = Record.newRecord(name, type, dclass);
Message query = Message.newQuery(rec);
Message response = res.send(query);
Record[] answers = response.getSectionArray(Section.ANSWER);
if (answers.length == 0)
return hostIp;
else
return answers[0].rdataToString();
}
}