ddns_client

import os
import socket
import requests

SERVER = ''
ZONE = ''

def public_ip():
    try:
        resp = requests.get('http://httpbin.org/ip')
        return resp.json()['origin']
    except Exception, e:
        pass
    return "cannot get public ip."

def update(key, domain, ip):
    p = os.popen('nsupdate -k %s' % key, 'w')
    p.write('server %s\n' % SERVER)
    p.write('zone %s\n' % ZONE)
    p.write('update del %s A\n' % domain)
    p.write('update add %s 600 A %s\n' % (domain, ip))
    p.write('send\n')
    p.close()


if __name__=='__main__':
    cur_ip = socket.gethostbyname('')
    pub_ip = public_ip()
    if cur_ip != pub_ip:
        update('', '', pub_ip)