README.md

Bash script to update the ddns entry of a namecheap domain

Needs yq (pip install yq) and dig to be installed

Usage

curl -s https://gist.githubusercontent.com/jroehl/25dcd6a35d5cf7809d3274439a1e6783/raw/update-ddns.sh | bash -s "host" "domain" "password"

update-ddns.sh

#!/usr/bin/env bash

HOST="$1"
DOMAIN="$2"
PASSWORD="$3"

if [ "$HOST" == "@" ]; then
  SET_IP=$(dig +short ${DOMAIN})
else
  SET_IP=$(dig +short ${HOST}.${DOMAIN})
fi

CURRENT_IP=$(dig +short myip.opendns.com @resolver1.opendns.com)

echo "IP of a-record \"${HOST}.${DOMAIN}\" = \"${SET_IP}\" / current ip \"${CURRENT_IP}\""
if [ "$CURRENT_IP" != "$SET_IP" ]; then
  RES=`curl -s -X GET "https://dynamicdns.park-your-domain.com/update?host=${HOST}&domain=${DOMAIN}&password=${PASSWORD}&ip=${CURRENT_IP}"`
  if command -v xq >/dev/null 2>&1; then
    echo $RES | xq '.'
  else
    echo $RES
  fi
else
  echo "DDNS entry already up to date (${CURRENT_IP})"
fi