Dynamic DNS client updater for no-ip.com service

noip.rb

#!/usr/bin/env ruby
#
# Dynamic DNS client updater for no-ip.com service
#

require 'rubygems'
require 'logger'
require 'net/http'
require 'optparse'
require 'uri'

class NOIP
  VERSION = '0.1'
  UPDATE_HOST = "dynupdate.no-ip.com"
  MYIP_HOST = "ip1.dynupdate.no-ip.com"

  def self.MyIP
    Net::HTTP.get(URI.parse("http://#{MYIP_HOST}"))
  end

  def self.Update(host, user, pass, myip=nil)
    uri = URI.parse("https://#{UPDATE_HOST}/nic/update")

    uri.query = "hostname=#{host}"
    uri.query += "&myip=#{myip}" if myip

    ua = "noip.rb/#{VERSION} pranay.kanwar@gmail.com"

    http = Net::HTTP.new(uri.host, uri.port)
    http.use_ssl = true if uri.scheme == "https"
    http.ssl_version = :TLSv1

    req = Net::HTTP::Get.new(uri.request_uri, {"UserAgent" => ua})
    req.basic_auth user, pass

    res = http.start {|h| h.request(req) }
    res.body
  end

  def self.run(args)
    options = {}
    options[:myip] = false

    opts = OptionParser.new do |opts|
      opts.banner = "Usage: #{__FILE__} [options]"
      opts.separator ""

      opts.on("-h", "--host HOSTNAME", "Update HOSTNAME") do |host|
        options[:host] = host
      end

      opts.on("-u", "--username USERNAME", "Access USERNAME") do |user|
        options[:user] = user
      end

      opts.on("-p", "--password PASSWORD", "Access PASSWORD") do |pass|
        options[:pass] = pass
      end

      opts.on("-m", "--myip", "Use #{MYIP_HOST} to get IP address") do
        options[:myip] = true
      end

      opts.on_tail("-H", "--help", "Show this message") do
        puts opts
        exit
      end
    end

    log = Logger.new(STDOUT)

    begin
      opts.parse!(args)
      myip = nil

      raise OptionParser::MissingArgument, "-h, no host given."\
        if not options[:host]

      raise OptionParser::MissingArgument, "-u, no username given."\
        if not options[:user]

      raise OptionParser::MissingArgument, "-p, no password given."\
        if not options[:pass]

      if options[:myip]
        log.info "Requesting IP Address from #{MYIP_HOST}"
        myip = MyIP()
        log.info "IP Address #{myip}"
      end

      resp = Update(options[:host], options[:user], options[:pass], myip)
      log.info "Resposnse #{resp}"
    rescue Errno::ECONNRESET
      # ignore
    rescue SystemExit
      exit
    rescue Exception => e
      log.fatal "#{e.class} #{e.message}"
      exit
    end
  end
end

NOIP.run(ARGV)