#!/bin/sh passwd='dyndnshosts' hostname=$(hostname | tr '[:upper:]' '[:lower:]') platform='unknown' unamestr=$(uname) if [ "$unamestr" = 'Linux' ]; then platform='linux' elif [ "$unamestr" = 'FreeBSD' ]; then platform='freebsd' fi ip6addr='' ip4addr='' if [ $platform = 'linux' ]; then ip6addr=$(ip -6 addr show scope global | grep inet6 | tail -1 | egrep -o '([0-9abcdef]{4}[0-9:abcdef]*)') # filter local IPv4 address ranges (172.16.0.0/12, 10.0.0.0/8, 192.168.0.0/16) ip4addr=$(ip -4 addr show scope global | grep inet | egrep -o '([0-9]{1,3}\.){3}[0-9]{1,3}' | grep -Ev '172.(1[6-9]|2[0-9]|3[0-1])' | grep -Ev '10.' | grep -Ev '192.168.' | head -n 1) elif [ $platform = 'freebsd' ]; then ip6addr=$(ifconfig em0 | grep inet6 | tail -1 | egrep -o '([0-9abcdef]{4}[0-9:abcdef]*)') ip4addr=$(ifconfig em0 inet | grep inet | egrep -o '([0-9]{1,3}\.){3}[0-9]{1,3}' | head -n 1) fi echo "Current IP addresses of $hostname are: $ip4addr, $ip6addr" if [ $ip4addr ]; then echo "Updating IPv4 DNS entry..." else echo "No public IPv4 address, updating DNS entry anyway..." fi # API always returns 200, so check for response payload to begin with {"Success":true, url="https://dyndns.jtbx.de/update?secret=$passwd&domain=$hostname&addr=$ip4addr" statuscode=$(curl -s $url) case "$statuscode" in {\"Success\":true*) echo "IPv4 Success" ;; *) (>&2 echo "IPv4 DynDNS update failed: API response:\n$statuscode") ;; esac if [ $ip6addr ]; then echo "Updating IPv6 DNS entry..." # API always returns 200, so check for response payload to begin with {"Success":true, url="https://dyndns.jtbx.de/update?secret=$passwd&domain=$hostname&addr=$ip6addr" statuscode=$(curl -s $url) case "$statuscode" in {\"Success\":true*) echo "IPv6 Success" ;; *) (>&2 echo "IPv6 DynDNS update failed: API response:\n$statuscode") ;; esac else echo "No public IPv6 Address, skipping DNS update." fi