Check if nameservers for domains are correct

verify-nameservers.rb

#!/usr/bin/env ruby
# Check if nameservers for domains are correct
# List of domains goes in on STDIN. 
# comma seperated list of nameservers as arg

interval = 25

require 'rubygems'
require 'whois'

if ARGV.empty?
	print "Usage: cat list-of-domains.txt | "
	puts "verify-nameservers.rb ns1.example.net,ns2.example.net"
	exit 1
end

nameservers = ARGV.shift.split(',')

c = Whois::Client.new

ARGF.each_line do |domain|
	domain.chomp!
	begin
		r = c.lookup(domain)
	rescue Whois::ServerNotFound
		print domain + " no whois server found?" + "\n"
		next
	rescue
		print domain + " unknown error" + "\n"
		next
	end

	if r.available?
		print domain + " not registered?" + "\n"
		next
	end

	# check if wrong number of nameservers
	if r.nameservers.length != nameservers.length
		print domain + " nameservers " + r.nameservers.join(", ") + "\n"
		next
	end
		
	# check nameservers, case insensitive but order matters
	badns = false
	nameservers.each_with_index do |ns, idx|
		domns = r.nameservers[idx]
		if not ns.casecmp domns.name
			badns = true
		end
	end
	if badns == true
		print domain + " nameservers " + r.nameservers.join(", ") + "\n"
	end
	
	sleep(interval) # because PIR rate limiting
end