#!/bin/bash
# Namecheap Dynamic DNS Updater
# https://www.namecheap.com/support/knowledgebase/article.aspx/29/11/how-to-dynamically-update-the-hosts-ip-with-an-https-request/

declare -a domains
           domains=( "primal.host" )
declare -a ipAddrs
           ipAddrs=( "0.0.0.0" )
declare -a passwords
           passwords=( "4e6b91f434284c6d9261d5779b1d560f" )

while true ; do
  ipPublic=$(curl --no-progress-meter 'https://api.ipify.org?format=text')
  echo "$(date '+%Y-%m-%d %H:%M:%S') Public IP: ${ipPublic}"
  for i in ${!domains[@]} ; do
    domain=${domains[$i]}
    ipAddr=${ipAddrs[$i]}
    password=${passwords[$i]}
    if [[ "$ipPublic" != "$ipAddr" ]] ; then
      for host in '@' '*' ; do
        response="$(curl --no-progress-meter -G -d "host=$host" -d "domain=$domain" -d "password=$password" -d "ip=$ipPublic" https://dynamicdns.park-your-domain.com/update)"
        if [[ $(echo $response | grep -c "<ErrCount>0</ErrCount>" -) -ne 1 ]] ; then
          echo "  ERROR updating ${host}.${domain}: $response"
        else
          ipAddrs[${i}]="$ipPublic"
          echo "  Updated ${host}.${domain} -> ${ipPublic}"
        fi
      done
    fi
  done
  sleep 3600
done