ruby.rb

require 'ipaddr'
 
module Puppet::Parser::Functions
	# args -> ['ip address', [['name', 'CIDR network', vlanid],...]]
    newfunction(:find_vlan_id, :type => :rvalue) do |args|
        subnet = args[1].select do |name, net, vlan|
            raise Puppet::ParseError, "2: " + name.to_s + "-" + net.to_s + "-" + vlan.to_s
            IPAddr.new(net) === args[0]
        end

        return subnet ? subnet[2] : nil
    end
end