No-IP update script

noip-update.rb

#!/usr/bin/env ruby 

require 'logger'

USERNAME = "me%40example.org"
PASSWORD = "password"
HOSTNAME = "subdomain.no-ip.biz"
TEMPFILE = "/tmp/ip_address"
TTL = 86400
LOGFILE = "/var/log/noip.log"

current_ip = `curl http://curlmyip.com 2>/dev/null`.strip

if File.exist?(TEMPFILE)
  last_ip = open(TEMPFILE).read.strip 
  last_updated = File.mtime(TEMPFILE)
else
  last_ip = ""
  last_updated = 0
end

log = Logger.new(LOGFILE)

if last_ip != current_ip || (Time.now - last_updated) > TTL
  result = `curl -k "https://#{USERNAME}:#{PASSWORD}@dynupdate.no-ip.com/nic/update?hostname=#{HOSTNAME}" 2>/dev/null`
  File.open(TEMPFILE, 'w') { |file| file.write(current_ip) }
  log.info(result)
end

noip.log

I, [2014-01-14T11:07:38.425934 #848]  INFO -- : Hello World
I, [2014-01-17T12:15:20.406824 #5554]  INFO -- : nochg 94.173.20.56
I, [2014-01-18T12:30:01.656793 #8910]  INFO -- : nochg 94.173.20.56
I, [2014-01-19T12:30:02.419608 #16856]  INFO -- : nochg 94.173.20.56
I, [2014-01-20T12:45:05.396566 #20786]  INFO -- : 
I, [2014-01-21T13:00:02.216972 #22767]  INFO -- : nochg 94.173.20.56
I, [2014-01-22T13:15:02.167938 #24953]  INFO -- : nochg 94.173.20.56
I, [2014-01-23T19:00:02.265888 #27297]  INFO -- : nochg 94.173.20.56
I, [2014-01-24T19:15:02.764824 #31664]  INFO -- : nochg 94.173.20.56
I, [2014-01-25T19:30:02.090007 #35850]  INFO -- : nochg 94.173.20.56
I, [2014-01-26T19:45:02.079662 #48628]  INFO -- : nochg 94.173.20.56
I, [2014-01-27T20:00:01.792617 #71181]  INFO -- : nochg 94.173.20.56
I, [2014-01-28T20:00:02.612154 #74402]  INFO -- : nochg 94.173.20.56
I, [2014-01-29T20:15:02.737142 #78330]  INFO -- : nochg 94.173.20.56
I, [2014-01-30T20:30:02.506062 #81007]  INFO -- : nochg 94.173.20.56
I, [2014-01-31T20:45:02.407692 #89233]  INFO -- : nochg 94.173.20.56
I, [2014-02-01T21:00:03.410672 #94081]  INFO -- : nochg 94.173.20.56
I, [2014-02-02T21:15:02.319380 #98939]  INFO -- : nochg 94.173.20.56
I, [2014-02-03T21:30:02.180255 #3782]  INFO -- : nochg 94.173.20.56
I, [2014-02-04T21:45:02.027728 #7192]  INFO -- : nochg 94.173.20.56
I, [2014-02-05T21:45:03.348978 #11484]  INFO -- : nochg 94.173.20.56