136 lines
4.5 KiB
Java
136 lines
4.5 KiB
Java
/**
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*
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* Copyright 2013-2017 Florian Schmaus
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.jivesoftware.smack.util.dns.javax;
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import java.net.InetAddress;
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import java.util.ArrayList;
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import java.util.Hashtable;
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import java.util.List;
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import java.util.logging.Level;
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import javax.naming.NameNotFoundException;
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import javax.naming.NamingEnumeration;
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import javax.naming.NamingException;
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import javax.naming.directory.Attribute;
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import javax.naming.directory.Attributes;
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import javax.naming.directory.DirContext;
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import javax.naming.directory.InitialDirContext;
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import org.jivesoftware.smack.ConnectionConfiguration.DnssecMode;
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import org.jivesoftware.smack.initializer.SmackInitializer;
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import org.jivesoftware.smack.util.DNSUtil;
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import org.jivesoftware.smack.util.dns.DNSResolver;
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import org.jivesoftware.smack.util.dns.HostAddress;
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import org.jivesoftware.smack.util.dns.SRVRecord;
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/**
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* A DNS resolver (mostly for SRV records), which makes use of the API provided in the javax.* namespace.
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*
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* @author Florian Schmaus
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*
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*/
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public class JavaxResolver extends DNSResolver implements SmackInitializer {
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private static JavaxResolver instance;
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private static DirContext dirContext;
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static {
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try {
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Hashtable<String, String> env = new Hashtable<String, String>();
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env.put("java.naming.factory.initial", "com.sun.jndi.dns.DnsContextFactory");
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dirContext = new InitialDirContext(env);
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} catch (Exception e) {
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// Ignore.
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}
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// Try to set this DNS resolver as primary one
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setup();
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}
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public static synchronized DNSResolver getInstance() {
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if (instance == null && isSupported()) {
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instance = new JavaxResolver();
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}
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return instance;
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}
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public static boolean isSupported() {
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return dirContext != null;
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}
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public static void setup() {
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DNSUtil.setDNSResolver(getInstance());
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}
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public JavaxResolver() {
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super(false);
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}
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@Override
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protected List<SRVRecord> lookupSRVRecords0(String name, List<HostAddress> failedAddresses, DnssecMode dnssecMode) {
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List<SRVRecord> res = null;
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Attribute srvAttribute;
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try {
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Attributes dnsLookup = dirContext.getAttributes(name, new String[] { "SRV" });
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srvAttribute = dnsLookup.get("SRV");
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if (srvAttribute == null)
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return null;
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} catch (NameNotFoundException e) {
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LOGGER.log(Level.FINEST, "No DNS SRV RR found for " + name, e);
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return null;
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} catch (NamingException e) {
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LOGGER.log(Level.WARNING, "Exception while resolving DNS SRV RR for " + name, e);
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return null;
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}
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try {
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@SuppressWarnings("unchecked")
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NamingEnumeration<String> srvRecords = (NamingEnumeration<String>) srvAttribute.getAll();
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res = new ArrayList<>();
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while (srvRecords.hasMore()) {
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String srvRecordString = srvRecords.next();
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String[] srvRecordEntries = srvRecordString.split(" ");
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int priority = Integer.parseInt(srvRecordEntries[srvRecordEntries.length - 4]);
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int port = Integer.parseInt(srvRecordEntries[srvRecordEntries.length - 2]);
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int weight = Integer.parseInt(srvRecordEntries[srvRecordEntries.length - 3]);
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String host = srvRecordEntries[srvRecordEntries.length - 1];
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List<InetAddress> hostAddresses = lookupHostAddress0(host, failedAddresses, dnssecMode);
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if (hostAddresses == null) {
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continue;
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}
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SRVRecord srvRecord = new SRVRecord(host, port, priority, weight, hostAddresses);
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res.add(srvRecord);
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}
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}
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catch (NamingException e) {
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LOGGER.log(Level.SEVERE, "Exception while resolving DNS SRV RR for" + name, e);
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}
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return res;
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}
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@Override
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public List<Exception> initialize() {
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setup();
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return null;
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}
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}
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