#!/bin/bash


## This simple shell script is a "DNS LOOP CHANGER" to change the DNS of the Linux operating system
## regularly, especially when using multihop-VPN's.
## It can be freely copied, distributed, modified.
## This script should be used with base numbered DNS files.
## Using it as is without the numbered DNS base files is dangerous.
## Read the script before using it. 

## Ce script shell simple est un "DNS LOOP CHANGER" pour changer le DNS du sytème d'exploitation Linux
## régulièrement, notamment lors de l'usage de VPN's multihop.
## Il peut être librement copié, diffusé, modifié.
## Ce script doit être utilisé avec des fichiers base numéroté de DNS.
## Son utilisation telle quelle sans les fichiers base de DNS numérotés est dangereuse.
## Lisez le script avant de l'utiliser.

## Questo semplice script di shell è un "DNS LOOP CHANGER" per cambiare regolarmente il DNS del sistema operativo Linux,
## specialmente quando si usano VPN multihop.
## Può essere liberamente copiato, distribuito, modificato.
## Questo script deve essere utilizzato con i file DNS numerati base.
## Usarlo così com'è senza i file base DNS numerati è pericoloso.
## Leggi lo script prima di usarlo.


   systemctl stop resolvconf.service
      echo " !! Stop resolvconf.service !!";
   systemctl start resolvconf.service
      echo " ...";
      echo " ...";
      echo " ...";
      echo " !! Start resolvconf.service !!"



  let incre=$((1));
  let loopnumber=$((0));
  let QW=$((0))
  let loopnumber=$((loopnumber+incre));

 while [[ 1 ]]; do

  let QW=$((QW+1));

      echo "  ...";
      echo "  ...";
      echo "  ...";

      echo "  Loop n° "$loopnumber;
      echo "  ...";
      echo "  ...";
      echo "  ...";
      echo "  >>> DNS BASE $QW <<<";

   rm /etc/resolv.conf

   cp /etc/resolvconf/resolv.conf.d/base$QW /etc/resolvconf/resolv.conf.d/base
   cp /etc/resolvconf/resolv.conf.d/base$QW /etc/resolv.conf

   systemctl restart resolvconf.service
   systemctl status dnsloopchanger.service

  sleep 975

      echo " ...";
      echo " - DNS BASE $QW ENDED -";
      echo " ...";
      echo " - NOW NEXT DNS BASE -";
      echo " ...";

  if [[ $QW == 11 ]]; then

     let QW=$((0));

     let loopnumber=$((loopnumber+incre));

  fi


 done

exit 0;