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Code Issues Releases Wiki Activity

DNS: Correctly handle broken SRV records

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where the SRV RR points to a target DNS name with no associated A or
AAAA RRs.

Fixes SMACK-781.
This commit is contained in:
Florian Schmaus 2017-10-14 13:29:46 +02:00
parent 122bf06ccc
commit 01aa6d9c18
4 changed files with 37 additions and 3 deletions
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9
smack-resolver-minidns/src/main/java/org/jivesoftware/smack/util/dns/minidns/MiniDnsResolver.java
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@ -24,6 +24,7 @@ import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
import java.util.Set;
import java.util.logging.Level;
import org.jivesoftware.smack.ConnectionConfiguration.DnssecMode;
import org.jivesoftware.smack.initializer.SmackInitializer;
@ -90,7 +91,13 @@ public class MiniDnsResolver extends DNSResolver implements SmackInitializer {
for (SRV srv : result.getAnswers()) {
String hostname = srv.name.ace;
List<InetAddress> hostAddresses = lookupHostAddress0(hostname, failedAddresses, dnssecMode);
if (hostAddresses == null) {
if (hostAddresses == null || hostAddresses.isEmpty()) {
// If hostAddresses is not null but empty, then the DNS resolution was successful but the domain did not
// have any A or AAAA resource records.
if (hostAddresses.isEmpty()) {
LOGGER.log(Level.INFO, "The DNS name " + name + ", points to a hostname (" + hostname
+ ") which has neither A or AAAA resource records. This is an indication of a broken DNS setup.");
}
continue;
}