dynv6 python script

dynv6.py

#!/usr/bin/env python2

import subprocess
import re
import urllib2
import os

hostname = "xxx.dynv6.net"
token    = "your-secret-token"

output = subprocess.check_output(["ip", "addr", "list", "dev", "pppoe0", "scope", "global"])
inet4  = re.search('inet ([\d\.]+)', output).group(1)
inet6  = re.search('inet6 ([\da-f:]+)', output).group(1)

output = subprocess.check_output(["ip", "addr", "list", "dev", "switch0", "scope", "global"])
prefix = re.search('inet6 ([\da-f:]+/\d+)', output).group(1)


with os.fdopen(os.open('/tmp/dynv6.addr', os.O_RDWR | os.O_CREAT), "r+") as fd:
    # read current address
    current = fd.read()

    if current != inet4:
      url = "http://dynv6.com/api/update?token=%s&hostname=%s&ipv4=%s&ipv6=%s" % (token, hostname, inet4, prefix)
      print urllib2.urlopen(url).read()

      # save current address
      fd.seek(0)
      fd.truncate(0)
      fd.write(inet4)
      fd.close()