Auto reconnect Wireguard on Debian

wg-auto-reconnect.sh

#!/bin/bash

# Function to check internet connection
check_internet() {
    if ping -q -c 1 -W 1 8.8.8.8 >/dev/null 2>&1; then
        return 0 # Internet is available
    else
        return 1 # No internet connection
    fi
}

# Function to check if WireGuard is running
check_wireguard() {
    if systemctl is-active --quiet wg-quick@wg0; then
        return 0 # WireGuard is running
    else
        return 1 # WireGuard is not running
    fi
}

# Check internet connection
if check_internet; then
    echo "Internet connection is available."

    # Check if WireGuard is running
    if check_wireguard; then
        echo "WireGuard is already running. Exiting."
        exit 0
    else
        echo "WireGuard is not running. Starting WireGuard."
        wg-quick up wg0
        exit 0
    fi
else
    echo "No internet connection. Turning off WireGuard."

    # Turn off WireGuard
    wg-quick down wg0

    # Wait for 3 seconds
    sleep 3

    # Check internet connection again
    if check_internet; then
        echo "Internet is back. Starting WireGuard."
        wg-quick up wg0
    else
        echo "No internet connection after retry. Exiting."
        exit 0
    fi
fi