How can I make ddclient update my dyndns address whenever NetworkManager makes or cuts a connection?


NetworkManager automatically calls scripts placed in /etc/NetworkManager/dispatcher.d with some interesting environment variables set. This is documented to some degree under man NetworkManager, but not all environment variables are explained there. I use a script like the one below, because i prefer the IP-Adress of the VPN-connection to be used on dyndns. The script also uses the last of multiple listed addresses, in the hope that it will be the most current, most important one.

#!/usr/bin/env python

import sys
import os
import subprocess

env = os.environ
n = int(env['IP4_NUM_ADDRESSES'])
nvpn = int(env.get('VPN_IP4_NUM_ADDRESSES',0))

if nvpn>0:
    ip = env['VPN_IP4_ADDRESS_'+str(nvpn-1)].split('/')[0]
    ip = env['IP4_ADDRESS_'+str(n-1)].split('/')[0]

ret = subprocess.call(['/usr/sbin/ddclient', '-daemon=0', '-syslog', '-use=ip', '-ip='+ip])

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.