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#!/usr/bin/env python

#

# Use a TSIG-signed DDNS update to update our hostname-to-address

# mapping.

#

# usage: ddns.py <ip-address>

#

# On linux systems, you can automatically update your DNS any time an

# interface comes up by adding an ifup-local script that invokes this

# python code.

#

# E.g. on my systems I have this

#

# #!/bin/sh

#

# DEVICE=$1

#

# if [ "X${DEVICE}" == "Xeth0" ]; then

# IPADDR=`LANG= LC_ALL= ifconfig ${DEVICE} | grep 'inet addr' |

# awk -F: '{ print $2 } ' | awk '{ print $1 }'`

# /usr/local/sbin/ddns.py $IPADDR

# fi

#

# in /etc/ifup-local.

#

import sys

import dns.update

import dns.query

import dns.tsigkeyring

#

# Replace the keyname and secret with appropriate values for your

# configuration.

#

keyring = dns.tsigkeyring.from_text({

'keyname.': 'NjHwPsMKjdN++dOfE5iAiQ=='

})

#

# Replace "example." with your domain, and "host" with your hostname.

#

update = dns.update.Update('example.', keyring=keyring)

update.replace('host', 300, 'A', sys.argv[1])

#

# Replace "10.0.0.1" with the IP address of your master server.

#

response = dns.query.tcp(update, '10.0.0.1', timeout=10)