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From: "Haohui Mai (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (HDFS-7942) NFS: support regexp grouping in
 nfs.exports.allowed.hosts
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    [ https://issues.apache.org/jira/browse/HDFS-7942?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14370157#comment-14370157 ] 

Haohui Mai commented on HDFS-7942:
----------------------------------

{code}
     } else if (host.contains("*") || host.contains("?") || host.contains("[")
-        || host.contains("]")) {
+        || host.contains("]") || host.contains("(") || host.contains(")")) {
{code}

Does it need to include other escape characters, such as +, -, etc.?

> NFS: support regexp grouping in nfs.exports.allowed.hosts
> ---------------------------------------------------------
>
>                 Key: HDFS-7942
>                 URL: https://issues.apache.org/jira/browse/HDFS-7942
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: nfs
>    Affects Versions: 2.6.0
>            Reporter: Brandon Li
>            Assignee: Brandon Li
>         Attachments: HDFS-7942.001.patch
>
>
> Thanks, [~yeshavora], for reporting this problem.
> Set regex value in nfs.exports.allowed.hosts property.
> {noformat}
> <property><name>nfs.exports.allowed.hosts</name><value>206.190.52.[26|23] rw</value></property>
> {noformat}
> With this value, neither 206.190.52.26 nor 206.190.52.23 can mount nfs and act as nfs client. In conclusion, no host can mount nfs with this regex value due to access denied error.
> {noformat}
> >$ sudo su - -c "mount -o soft,proto=tcp,vers=3,rsize=1048576,wsize=1048576,nolock 206.190.52.23:/ /tmp/tmp_mnt" root
> mount.nfs: access denied by server while mounting 206.190.52.23:/
> {noformat}



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