bundlewrap/bundles/pppd/files/check_dyndns_update

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#!/bin/bash
[[ -n "$DEBUG" ]] && set -x
interface="$(ip link show | awk '/ ppp/ {print substr($2, 1, length($2)-1)}')"
addr="$(ip addr show dev "$interface" | awk '/inet / {print $2}')"
resolved="$(dig +short "${domain}" A)"
if [[ -z "$addr" ]] || [[ -z "$resolved" ]]
then
echo "Address on '$interface' is '$addr' - resolved '$resolved'"
exit 3
elif [[ "$addr" == "$resolved" ]]
then
echo "Resolved IP for ${domain} matches current ip on $interface"
exit 0
else
echo "Resolved $resolved for ${domain}, but got $addr on $interface!"
exit 2
fi