Dynamic DNS updater by dot for Zerigo

zerigoddns.rb

#!/usr/bin/env ruby
# -*- coding: utf-8 -*-
# Dynamic DNS updater by dot for Zerigo
#
# need gem 'net-dns'

require 'yaml'
require 'ipaddr'
require 'open-uri'
require 'logger'
require 'pp'
require 'timeout'

configpath = File.expand_path('info.yml', File.dirname(__FILE__))
unless File.exists? configpath
  File.open(configpath, 'w+') do |f|
    f.write({}.to_yaml)
  end
end
config = YAML.load_file(configpath) || {} rescue {}


API_KEY = 'myzerigoapikey'          # your Zerigo API key
USER = '[email protected]'           # your Zerigo username
NS = 'a.ns.zerigo.net'     # Zerigo nameserver to query
HOSTS = ['test.example.com', 'test.example.jp'] # the host you want to dynamically update
# for get local grobal ip
URLS = ['http://dyn.value-domain.com/cgi-bin/dyn.fcg?ip',
        'http://ieserver.net/ipcheck.shtml']

logger = Logger.new('./update.log')
logger.level = Logger::INFO

# ---
current_ip = config[:current_ip]
new_ip = nil
dns_ip = nil

# diff ipaddr local store
URLS.each do |uri|
  begin
    new_ip = IPAddr.new(open(uri).read)
    break
  rescue StandardError, Timeout::Error => e
    logger.warn(e)
    next
  end
end

if !new_ip
  logger.info('cannot get wan address.')
  exit
elsif new_ip.to_s == current_ip
  logger.debug('not necessary to change wan address.')
  exit
end

# Load more libraries
require 'resolv'
require 'rubygems'
require 'net/dns/resolver'

# Resolving the IP address stored in the DNS server
ns_ip = Resolv.getaddress(NS).to_s
res = Net::DNS::Resolver.new(:nameservers => ns_ip)
failures = []
HOSTS.each do |host|
  begin
    # make sure you query the right Nameserver
    res.search(host).each_address { |ip| dns_ip = ip }

    if new_ip.to_s != dns_ip
      url = "http://update.zerigo.com/dynamic?host=#{host}&user=#{USER}&password=#{API_KEY}"
      puts open(url).read
    end
  rescue => e
    failures << host
    logger.error(e)
  end
end

if failures.empty?
  config[:current_ip] = new_ip.to_s
  config[:updated_at] = Time.now
  File.open(configpath, 'w+') do |f|
    f.write(config.to_yaml)
  end

  puts "Succeeded ip address updateing: #{current_ip} to #{new_ip.to_s}"
else
  puts "at #{failures.inspect}: update ip failure (see logs)"
end