#--
#Copyright 2007 Nominet UK
#
#Licensed under the Apache License, Version 2.0 (the "License");
#you may not use this file except in compliance with the License.
#You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
#Unless required by applicable law or agreed to in writing, software
#distributed under the License is distributed on an "AS IS" BASIS,
#WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#See the License for the specific language governing permissions and
#limitations under the License.
#++

require 'dnsruby'

#= NAME
#
#mx - Print a domain's MX records
#
#= SYNOPSIS
#
#mx domain
#
#= DESCRIPTION
#
#mx prints a domain's MX records, sorted by preference.
#
#= AUTHOR
#
#Michael Fuhr <mike@fuhr.org>
#(Ruby port AlexD, Nominet UK)
#

if ARGV.length == 1
  dname = ARGV[0]
  res   = Dnsruby::DNS.new
  begin
    res.each_resource(dname, 'MX') { |rr|
      print rr.preference, "\t", rr.exchange, "\n"
    }
  rescue Exception => e
    print "Can't find MX hosts for #{dname}: ", e, "\n"
  end
else
  print "Usage: #{$0} domain\n"
end