lib/puppet/functions/dns_record/rev_record.rb


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require 'ipaddr'

Puppet::Functions.create_function(:'dns_record::rev_record') do
  dispatch :rev_record do
    param 'Stdlib::IP::Address::V6::Nosubnet', :ip
    param 'Stdlib::IP::Address::V6::Nosubnet', :netmask
    return_type 'Tuple[String,2]'
  end

  def rev_record(ip, netmask)
    cidr = IPAddr.new("::/#{netmask}").prefix
    addr = IPAddr.new ip
    parts = addr.ip6_arpa.split('.')

    [ parts.take(cidr/4).join('.'), 
      parts.drop(cidr/4).join('.') ]
  end
end