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https://issues.apache.org/jira/browse/HADOOP-20020?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18127364#comment-18127364
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ASF GitHub Bot commented on HADOOP-20020:
-----------------------------------------
smengcl merged PR #8820:
URL: https://github.com/apache/hadoop/pull/8820
> 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: Sub-task
> Reporter: Siyao Meng
> Assignee: Siyao Meng
> Priority: Major
> Labels: pull-request-available
>
> {{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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