lib/dnspython/examples/ddns.py

   1 #!/usr/bin/env python
   2
   3 #
   4 # Use a TSIG-signed DDNS update to update our hostname-to-address
   5 # mapping.
   6 #
   7 # usage: ddns.py <ip-address>
   8 #
   9 # On linux systems, you can automatically update your DNS any time an
  10 # interface comes up by adding an ifup-local script that invokes this
  11 # python code.
  12 #
  13 # E.g. on my systems I have this
  14 #
  15 #       #!/bin/sh
  16 #
  17 #       DEVICE=$1
  18 #
  19 #       if [ "X${DEVICE}" == "Xeth0" ]; then
  20 #               IPADDR=`LANG= LC_ALL= ifconfig ${DEVICE} | grep 'inet addr' |
  21 #                       awk -F: '{ print $2 } ' | awk '{ print $1 }'`
  22 #               /usr/local/sbin/ddns.py $IPADDR
  23 #       fi
  24 #
  25 # in /etc/ifup-local.
  26 #
  27
  28 import sys
  29
  30 import dns.update
  31 import dns.query
  32 import dns.tsigkeyring
  33
  34 #
  35 # Replace the keyname and secret with appropriate values for your
  36 # configuration.
  37 #
  38 keyring = dns.tsigkeyring.from_text({
  39     'keyname.' : 'NjHwPsMKjdN++dOfE5iAiQ=='
  40     })
  41
  42 #
  43 # Replace "example." with your domain, and "host" with your hostname.
  44 #
  45 update = dns.update.Update('example.', keyring=keyring)
  46 update.replace('host', 300, 'A', sys.argv[1])
  47
  48 #
  49 # Replace "10.0.0.1" with the IP address of your master server.
  50 #
  51 response = dns.query.tcp(update, '10.0.0.1', timeout=10)