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cc636fff21
This is a complete redesign of what was previously XmppNioTcpConnection. The new architecture allows to extend an XMPP client to server (c2s) connection with new transport bindings and other extensions.
99 lines
3.1 KiB
Java
99 lines
3.1 KiB
Java
/**
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*
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* Copyright 2013-2020 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.dnsjava;
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import java.util.ArrayList;
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import java.util.List;
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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.rce.RemoteConnectionEndpointLookupFailure;
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import org.minidns.dnsname.DnsName;
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import org.minidns.record.SRV;
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import org.xbill.DNS.Lookup;
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import org.xbill.DNS.Record;
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import org.xbill.DNS.TextParseException;
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import org.xbill.DNS.Type;
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/**
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* This implementation uses the <a href="http://www.dnsjava.org/">dnsjava</a> implementation for resolving DNS addresses.
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*
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*/
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public class DNSJavaResolver extends DNSResolver implements SmackInitializer {
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private static final DNSJavaResolver instance = new DNSJavaResolver();
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public static DNSResolver getInstance() {
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return instance;
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}
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public DNSJavaResolver() {
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super(false);
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}
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@Override
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protected List<SRV> lookupSrvRecords0(DnsName name, List<RemoteConnectionEndpointLookupFailure> lookupFailures,
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DnssecMode dnssecMode) {
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Lookup lookup;
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try {
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lookup = new Lookup(name.ace, Type.SRV);
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}
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catch (TextParseException e) {
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RemoteConnectionEndpointLookupFailure failure = new RemoteConnectionEndpointLookupFailure.DnsLookupFailure(
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name, e);
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lookupFailures.add(failure);
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return null;
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}
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Record[] recs = lookup.run();
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if (recs == null) {
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// TODO: When does this happen? Do we want/need to record a lookup failure?
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return null;
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}
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List<SRV> res = new ArrayList<>();
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for (Record record : recs) {
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org.xbill.DNS.SRVRecord srvRecord = (org.xbill.DNS.SRVRecord) record;
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if (srvRecord != null && srvRecord.getTarget() != null) {
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DnsName host = DnsName.from(srvRecord.getTarget().toString());
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int port = srvRecord.getPort();
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int priority = srvRecord.getPriority();
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int weight = srvRecord.getWeight();
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SRV r = new SRV(priority, weight, port, host);
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res.add(r);
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}
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}
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return res;
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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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@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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