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/* Domain name validation.
Copyright (C) 2006, 2007 Jan Rafaj
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
MA 02110-1301 USA */
#require dns
# boolean valid_domain (string DOMAIN)
#
# Returns true if the domain name DOMAIN has a
# corresponding A record or if it has any MX records, that is if it can
# be possible to send mail to it.
#
func valid_domain(string domain) returns number
do
return not (resolve(%domain) = "0" and not hasmx(%domain))
done
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