make-dns - switches between default & alternative DNS to bypass legal shit.

#! /bin/sh
# make-dns 1.0 - switches between default & alternative DNS (CyberGhost) to bypass legal shit.

ERROR(){
    printf "\033[31mERROR! $1 argument. Must be either ON or OFF.\033[0m\n"
    exit 1
}

EDIT(){
    [ "$(id -u)" -eq 0 ] || exec sudo sh "$0" $1
    chattr -i /etc/resolv.conf
    printf "$CONTENT" > /etc/resolv.conf
    chattr +i /etc/resolv.conf
    echo "Done - DNS server set $2."
}

if [ $# -gt 0 ]; then
    if [ "$1" = "on" ] || [ "$1" = "ON" ]; then
        CONTENT="# Generated by NetworkManager
#search fritz.box
#nameserver 192.168.178.1
#nameserver fd00::f2b0:14ff:fe67:ea25\n
#CyberGhost
nameserver 38.132.106.139
nameserver 194.187.251.67\n"
        EDIT $1 "to CyberGhost"
    elif [ "$1" = "off" ] || [ "$1" = "OFF" ]; then
        CONTENT="# Generated by NetworkManager
search fritz.box
nameserver 192.168.178.1
nameserver fd00::f2b0:14ff:fe67:ea25\n
#CyberGhost
#nameserver 38.132.106.139
#nameserver 194.187.251.67\n"
        EDIT $1 "back to default"
    else
        ERROR "Wrong"
    fi
else
    ERROR "No"
fi