lxc-config/hooks/update-hetzner-rdns

#!/usr/bin/env ruby
require "netaddr"
require_relative "lib/lxc"

def update_hetzner_rdns6(user, password, domain, network)
  api = Lxc::Hetzner.new(user, password)
  rdns = api.get("/rdns")
  records = {}
  rdns.each do |val|
    rec = val["rdns"]
    cidr = NetAddr::CIDR.create(rec["ip"])
    next if cidr.version == 4
    records[cidr.ip] = rec["ptr"]
  end
  network.each do |host, data|
    cidr = data["ipv6"]
    next if cidr.nil?
    ipv6 = NetAddr::CIDR.create(cidr).ip
    hostname = data["rdns6"] || "#{host}.#{domain}"
    ptr = records.delete(ipv6)
    if ptr.nil? or ptr != hostname
      api.post("/rdns/#{ipv6}", ptr: hostname)
    end
  end
  records.each do |ip, ptr|
    api.delete("/rnds/#{ip}")
  end
end

credentials = File.read(Lxc::CONFIG_ROOT.join("hetzner.key"))
user, password = credentials.split(":")
registry = Lxc::Registry.new
registry.data["zone"] ||= {}
domain = registry.data["zone"]["domain"]
update_hetzner_rdns6(user, password, domain, registry.data["network"] || {})