dyndns.php

dyndns.php

<?php
$domain_list = array('deer', 'hippo', 'lion');

$domain = empty($_GET['domain']) ? '' : $_GET['domain'];
$address = empty($_GET['address']) ? '' : $_GET['address'];

if ($domain && $address && in_array($domain, $domain_list)) {
    file_put_contents($domain.'.txt', $address);
    echo 'OK';
} else {
    echo 'Wrong parameters';
}

update-dns.sh

#!/bin/bash

domain='deer'
address=$(hostname -I | awk '{print $1}') 
server="http://balblaaa.com/dyndns.php?domain=$domain&address=$address"

if curl $server; then
    echo 'OK'
else
    echo 'Error'
fi