#!/bin/bash
# Script to update dynu.com dynamic hosts
# Cron this to run occasionally
# Requirements: wget and dig
# Limitations: IPv4 only
# Script made by Snorkasaurus, last edited 2023-08-30
# https://snork.ca/gitsucks/#dynu-updater

# To get MYPWD run
# echo -n "YOURPASSWORD" | sha256sum | cut -d " " -f 1
# or paste your password at https://www.dynu.com/en-US/NetworkTools/Hash and hit SHA256

# If you do not want a log, just set MYLOG to "/dev/null"

# Modify these variables
MYHOST="EXAMPLE.freeddns.org"
MYUSER="USERNAME"
MYPWD="XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"
MYLOG="/path/to/${MYHOST}.log"
# Modifying these variables is discouraged
WANIP=`wget -4 -qO- https://ipinfo.io/ip`
DNSIP=`dig +short ${MYHOST} @ns1.dynu.com`
APIURL="https://api.dynu.com/nic/update"
# Here's the actual work of the script
if [ ${DNSIP} != ${WANIP} ]; then
  echo $(date +%Y)-$(date +%m)-$(date +%d) at $(date +%k):$(date +%M) - ${WANIP} >> ${MYLOG}
  wget -O /dev/null "${APIURL}?hostname=${MYHOST}&myip=${WANIP}myipv6=no&username=${MYUSER}&password=${MYPWD}"
fi