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#! /usr/bin/env ruby
# --
# 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)
#
def fatal_error(message)
puts message
exit -1
end
unless ARGV.length == 1
fatal_error("Usage: #{$0} name")
end
domain = ARGV[0]
resolver = Dnsruby::DNS.new
begin
resolver.each_resource(domain, 'MX') do |rr|
print rr.preference, "\t", rr.exchange, "\n"
end
rescue Exception => e
fatal_error("Can't find MX hosts for #{domain}: #{e}")
end
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