Siyao Meng created HADOOP-20020:
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Summary: DNS.reverseDns throws NullPointerException when the
answer has no PTR record
Key: HADOOP-20020
URL: https://issues.apache.org/jira/browse/HADOOP-20020
Project: Hadoop Common
Issue Type: Bug
Reporter: Siyao Meng
Assignee: Siyao Meng
{{DNS.reverseDns}} reads {{attribute.get("PTR").get()}} without a null check.
When the DNS server answers the reverse query with NOERROR but no PTR record (a
NODATA answer), JNDI returns no PTR attribute and {{reverseDns}} throws
{{NullPointerException}}.
The callers, {{DNS.getHosts}} and {{DNSDomainNameResolver.getHostnameByIP}},
only catch {{NamingException}}, so the exception escapes instead of falling
back. Through {{getHostnameByIP}} it reaches
{{SecurityUtil.getServerPrincipal(String, InetAddress)}} and
{{ServiceAuthorizationManager.authorize}}. A name that does not exist
(NXDOMAIN) already fails with {{NameNotFoundException}} and is handled.
Throw {{NameNotFoundException}} when the answer has no PTR record. This applies
to IPv4 and IPv6 addresses alike. It was seen with a resolver that answers
NODATA for the {{ip6.arpa}} name of {{::}}.
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