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From: "vincent.viallet at gmail dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sources.redhat.com
Subject: [Bug libc/12154] New: Can not resolve chained CNAME with a wildcard among the chained CNAME
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http://sourceware.org/bugzilla/show_bug.cgi?id=3D12154

           Summary: Can not resolve chained CNAME with a wildcard among
                    the chained CNAME
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
        AssignedTo: drepper.fsp@gmail.com
        ReportedBy: vincent.viallet@gmail.com


Apparently linux resolver can not resolve chained CNAME where one of the CN=
AME
is using a wildcard / *.
Or more precisely when a CNAME links to a * (star) CNAME that then resolv a=
s a
wildcard domain that links to another CNAME... (more clear in the example
below)

This behavior affects all the latest linux version I tested (CentOS 5.5 /
Ubuntu)


Reproduce the error :

run dig to resolve a chained cname record :

> dig @8.8.8.8 messenger.live.com
> ...
> ;; ANSWER SECTION:
> messenger.live.com.	2343	IN	CNAME	get.live.com.
> get.live.com.		3538	IN	CNAME	*.live.com.
> *.live.com.		3538	IN	CNAME	rds.live.com.nsatc.net.
> rds.live.com.nsatc.net.	103	IN	A	65.55.60.123

Can not resolve messenger.live.com :

> ping messenger.live.com
> ping: unknown host messenger.live.com

Resolving get.live.com is not working either.

But using the wildcard domain is working :

> ping random-domain.live.com
> PING rds.live.com.nsatc.net (65.55.60.123) 56(84) bytes of data.

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