gistfile1.txt

#!/usr/bin/env ruby
#
#  Parse a zone file and dump output suitable for a cucumber test data set
# 

class DnsZoneParser
  require 'socket'

  attr_accessor :records
  def initialize(filename)
    @records = Array.new

    File.open(filename, 'r').each_line do |line|
      next if (line =~ /^\s*;/)
      next if (line =~ /^\s*@/)
      next if (line =~ /^\s*\*/)
      parts = line.split
      next if parts.empty?
      next unless parts[2] =~ /A|CNAME/
      ap = {
        :type => parts[2],
        :name => parts[0],
        :dest => parts[3]
      }

      @records << ap
    end
  end

  def sort_type(type)
    (@records.find_all {|r| r[:type] == type }).sort{|a,b| a[:name] <=> b[:name]}
  end

  def print
    failed = []
    sort_type("A").each do |r|
      puts "|#{r[:name]}|#{r[:dest]}|"
    end

    sort_type("CNAME").each do |r|
      # determine if its an internal redir to an ip. 
      # if not just print as-s
      follow = @records.find{|i| i[:name] == r[:dest] }
      dest = follow ? follow[:dest] :  r[:dest]

      # if we end in a . try looking it up from here
      if dest =~ /.*\.$/
        begin
          s = ::Socket.getaddrinfo(dest.chop!,nil)
          dest = s[0][2]
        rescue
          failed << {:name => r[:name], :dest => dest.chop!}
          next
        end
      end
      puts "|#{r[:name]}|#{dest}| "
    end
    out = (failed.map {|k| "#{k[:name]}->#{k[:dest]}\n"}).join(" ")
    puts "-"*80
    puts "\nThese CNAMES failed:\n #{out}"
  end
end

z = DnsZoneParser.new(ARGV[0])
z.print