dn42-router/roles/edb-bird-filter/files/script.rb

require 'psych'
require 'ipaddr'

prefixes = []

exl = ["schema.json"]

Dir['/var/lib/bird/crxn/entitydb/*.json'].each do |entity_file|
  if ! exl.include? File.basename(entity_file)
  entity_json = File.read entity_file
  entity = Psych.safe_load entity_json

  entity_prefixes = entity['route']

  final_prefixes = []

  # avoid injection of code
  entity_prefixes.each_pair do |prefix, value|
    ip = IPAddr.new prefix

    maxlen = "64";
    if value['max-len']
        maxlen = value['max-len'].to_i.to_s
    end

    if ip.ipv6? && ip.private?
      final_prefixes << "#{ip}/#{ip.prefix}{#{ip.prefix},#{maxlen}}"
    else
      puts "Found illeagl ip #{ip.inspect}"
    end
  end

  prefixes.push(*final_prefixes)

  end

  rescue
    puts "Generic error: #{$!}"
end

conf_file = File.new '/var/lib/bird/crxn/crxn_ips.conf', 'w'

conf_file.puts 'define CRXN_IPs = ['
conf_file.puts "\t#{prefixes.join(",\n\t")}"
conf_file.puts '];'

conf_file.close