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[Bug network/12154] Cannot resolve hosts which have aliases which follow not host name syntax


https://sourceware.org/bugzilla/show_bug.cgi?id=12154

Florian Weimer <fweimer at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |fweimer at redhat dot com
            Summary|Can not resolve chained     |Cannot resolve hosts which
                   |CNAME with a wildcard among |have aliases which follow
                   |the chained CNAME           |not host name syntax

--- Comment #4 from Florian Weimer <fweimer at redhat dot com> ---
RFC 1034 is ambiguous whether this allowed or not.  These are simply
syntactically invalid labels.  Wildcards are transmitted over the wire because
they are a zone file concept.  They are not expanded on the RHS of a CNAME
record, which is why you see the â*â label here.

I'm not sure if it is a good idea to remove the restriction entirely because
aliases could now contain shell metacharacters.  We could drop them from the
return response and no longer fail the query, though.

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