#!/bin/bash
# Siemens SE 587 freedns update script
# Jonathan Cutting mcmlxxii.co.uk
# 20/9/2009

# Config
router_login="your_login_name"
router_password="your_login_password"
router_address="192.168.1.1"
afraid_url="your_dynamic_dns_url"
afraid_update_url="http://freedns.afraid.org/dynamic/update.php?YOUR_UPDATE_CODE"
# End config

dns_record=$(dig +short $afraid_url)
ip_address=$(expect -c "
    set timeout 15
    spawn telnet $router_address
    expect gin:
    send \"$router_login\r\"
    expect word:
    send \"$router_password\r\"
    expect >
    send \"ip show interface ipwan\r\"
    expect >
    exit
" | grep Ipaddr | awk '{print $3}' | sed -e 's/^M//')

if [ $ip_address != $dns_record ]
then
    date
    curl $afraid_update_url
fi