FD allows DNS entries with '_' (underscores) in hostnames

In Debian Edu we discovered a problem with GOsa² that also applies to FusionDirectory: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=653562

Quoting from the bug report:

""" when adding a network system to gosa it is possible to give it a name with an underscore. This leads into a LDAP error when I try to use this added host afterwards in the netgroups plugin. As far as I know underscores are not allowed in host names. There should be an input validation in gosa that only allows correct host names. """

DNS hostnames should not contain underscores as suggested by http://www.ietf.org/rfc/rfc952.txt

For further insights see: http://domainkeys.sourceforge.net/underscore.html

(from redmine: issue id 567, created on 2011-12-29, closed on 2012-03-02)

• Changesets:
  • Revision 136a4f59 by Benoit MORTIER on 2012-02-29T10:22:05.000Z:

Fixes: #567 FD allows DNS entries with '_' (underscores) in hostnames