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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.
# ++
# = NAME
#
# digitar - Ruby script to perform DNS queries, validated against the IANA TAR
# (trust anchor repository).
#
# = SYNOPSIS
#
# digroot name [ type [ class ] ]
#
# = DESCRIPTION
#
# Performs a DNS query on the given name. The record type
# and class can also be specified; if left blank they default
# to A and IN. The program firstly performs the requested DNS
# query. The response is then validated from the signed root.
#
# = AUTHOR
#
# Michael Fuhr <mike@fuhr.org>
# Alex D <alexd@nominet.org.uk>
require 'dnsruby'
def fatal_error(message)
puts message
exit -1
end
unless (1..3).include?(ARGV.length)
fatal_error("Usage: #{$0} name [ type [ class ] ]")
end
inner_resolver = Dnsruby::Resolver.new
inner_resolver.do_validation = true
inner_resolver.dnssec = true
resolver = Dnsruby::Recursor.new(inner_resolver)
resolver.dnssec = true
# Dnsruby::TheLog.level=Logger::DEBUG
name, type, klass = ARGV
type ||= 'A'
klass ||= 'IN'
begin
answer = resolver.query(name, type, klass)
print answer
rescue Exception => e
fatal_error("query failed: #{e}")
end
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