#!/usr/bin/env bash

# Script stores the current IP in a tmp file and later checks if it changed when run. POSTS to a Telegram bot. 
# Check how you can create a bot at https://core.telegram.org/bots

old_ip=`cat /tmp/currentip`
current_ip=`wget -qO- https://ipecho.net/plain`

if [ $current_ip != $old_ip ]; then
    curl -s -X POST https://api.telegram.org/bot<TELEGRAM_BOT_TOKEN>/sendMessage -d chat_id=<CHAT_ID> -d text="Machine changed IP from: ${old_ip} to ${current_ip}"
    wget -qO- https://ipecho.net/plain > /tmp/currentip
fi