85 lines
2.8 KiB
Java
85 lines
2.8 KiB
Java
|
/**
|
||
|
*
|
||
|
* Copyright 2014 Florian Schmaus
|
||
|
*
|
||
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
||
|
* you may not use this file except in compliance with the License.
|
||
|
* You may obtain a copy of the License at
|
||
|
*
|
||
|
* http://www.apache.org/licenses/LICENSE-2.0
|
||
|
*
|
||
|
* Unless required by applicable law or agreed to in writing, software
|
||
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
||
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||
|
* See the License for the specific language governing permissions and
|
||
|
* limitations under the License.
|
||
|
*/
|
||
|
package org.jivesoftware.smack.util.dns.minidns;
|
||
|
|
||
|
import java.util.LinkedList;
|
||
|
import java.util.List;
|
||
|
|
||
|
import org.jivesoftware.smack.util.dns.DNSResolver;
|
||
|
import org.jivesoftware.smack.util.dns.SRVRecord;
|
||
|
import org.jxmpp.util.cache.ExpirationCache;
|
||
|
|
||
|
import de.measite.minidns.Client;
|
||
|
import de.measite.minidns.DNSCache;
|
||
|
import de.measite.minidns.DNSMessage;
|
||
|
import de.measite.minidns.Question;
|
||
|
import de.measite.minidns.Record;
|
||
|
import de.measite.minidns.Record.CLASS;
|
||
|
import de.measite.minidns.Record.TYPE;
|
||
|
import de.measite.minidns.record.SRV;
|
||
|
|
||
|
|
||
|
/**
|
||
|
* This implementation uses the <a href="https://github.com/rtreffer/minidns/">minidns</a> implementation for
|
||
|
* resolving DNS addresses.
|
||
|
*/
|
||
|
public class MiniDnsResolver implements DNSResolver {
|
||
|
|
||
|
private static final long ONE_DAY = 24*60*60*1000;
|
||
|
private static final MiniDnsResolver instance = new MiniDnsResolver();
|
||
|
private static final ExpirationCache<Question, DNSMessage> cache = new ExpirationCache<Question, DNSMessage>(10, ONE_DAY);
|
||
|
private final Client client;
|
||
|
|
||
|
private MiniDnsResolver() {
|
||
|
client = new Client(new DNSCache() {
|
||
|
|
||
|
@Override
|
||
|
public DNSMessage get(Question question) {
|
||
|
return cache.get(question);
|
||
|
}
|
||
|
|
||
|
@Override
|
||
|
public void put(Question question, DNSMessage message) {
|
||
|
long expirationTime = ONE_DAY;
|
||
|
for (Record record : message.getAnswers()) {
|
||
|
if (record.isAnswer(question)) {
|
||
|
expirationTime = record.getTtl();
|
||
|
break;
|
||
|
}
|
||
|
}
|
||
|
cache.put(question, message, expirationTime);
|
||
|
}
|
||
|
|
||
|
});
|
||
|
}
|
||
|
|
||
|
public static DNSResolver getInstance() {
|
||
|
return instance;
|
||
|
}
|
||
|
|
||
|
@Override
|
||
|
public List<SRVRecord> lookupSRVRecords(String name) {
|
||
|
List<SRVRecord> res = new LinkedList<SRVRecord>();
|
||
|
DNSMessage message = client.query(name, TYPE.SRV, CLASS.IN);
|
||
|
for (Record record : message.getAnswers()) {
|
||
|
SRV srv = (SRV) record.getPayload();
|
||
|
res.add(new SRVRecord(srv.getName(), srv.getPort(), srv.getPriority(), srv.getWeight()));
|
||
|
}
|
||
|
return res;
|
||
|
}
|
||
|
}
|