Wireguard connection script

wg-switch.sh

#!/bin/sh

CONFDIR="/etc/wireguard/"

readarray -t AVAILABLE_INTERFACES < <(ls $CONFDIR | awk -F '.' '{print $1}')
readarray -t ACTIVE_INTERFACES < <(wg show | grep 'interface: ' | awk -F 'interface: ' '{print $2}')

list_available_interfaces()
{
    for i in "${!AVAILABLE_INTERFACES[@]}"
    do
        interface=${AVAILABLE_INTERFACES[$i]}
        echo $interface
    done
}

list_active_interfaces()
{
    for i in "${!ACTIVE_INTERFACES[@]}"
    do
        interface=${ACTIVE_INTERFACES[$i]}
        echo $interface
    done
}

stop_all_active()
{
    for i in "${!ACTIVE_INTERFACES[@]}"
    do
        interface=${ACTIVE_INTERFACES[$i]}
        systemctl stop wg-quick@$interface
        systemctl disable wg-quick@$interface
    done
}

activate_random()
{
    stop_all_active
    RANDOM=$$$(date +%s)
    NEW=${AVAILABLE_INTERFACES[ $RANDOM % ${#AVAILABLE_INTERFACES[@]} ]}
    systemctl enable --now wg-quick@$NEW
}

print_ip()
{
    wget -qO- http://ipecho.net/plain | xargs echo
}

if [ "$1" = "random" ];
then
    activate_random
elif [ "$1" = "stopall" ];
then
    stop_all_active
elif [ "$1" = "active" ];
then
    list_active_interfaces
elif [ "$1" = "available" ];
then
    list_available_interfaces
elif [ "$1" = "ip" ];
then
    print_ip
fi