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Fix NPE in DNSResolver.lookupSRVRecords0

Browse source 
in case hostAddresses was null, the isEmpty() check before the log()
invocation would throw an NPE. Thanks to Ingo Bauersachs for reporting
this.

Fixes SMACK-788.
This commit is contained in:
Florian Schmaus 2017-12-01 09:28:21 +01:00
parent be4aacc71d
commit 47940ba5ad
4 changed files with 21 additions and 24 deletions
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17
smack-core/src/main/java/org/jivesoftware/smack/util/dns/DNSResolver.java
View file

@ -20,6 +20,7 @@ import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.Arrays;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.jivesoftware.smack.ConnectionConfiguration.DnssecMode;
@ -91,6 +92,22 @@ public abstract class DNSResolver {
return Arrays.asList(inetAddressArray);
}
protected final boolean shouldContinue(CharSequence name, CharSequence hostname, List<InetAddress> hostAddresses) {
if (hostAddresses == null) {
return true;
}
// 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.");
return true;
}
return false;
}
private final void checkIfDnssecRequestedAndSupported(DnssecMode dnssecMode) {
if (dnssecMode != DnssecMode.disabled && !supportsDnssec) {
throw new UnsupportedOperationException("This resolver does not support DNSSEC");