wireguard watchdog

wg-watchdog.sh

#!/bin/bash
#
# This watchdog script restart systemctl wireguard service if ping timeout for 3 times
#
# Usage:
# ./wg-watchdog.sh [interface] [ip]
#
# Example:
# ./wg-watchdog.sh wg0 192.168.40.1
#
# Example in Crontab:
# */10 * * * * /root/tools/wg-watchdog.sh wg0 192.168.40.1
#

check_peer_activity() {
  interface=$1
  peer=$2

  tries=0
  while [[ $tries -lt 3 ]]
  do
    if ping -c 1 -W 3 $peer > /dev/null 2>&1
    then
      echo "[wg-watchdog] $interface $peer connected"
      return
    fi
    echo "[wg-watchdog] $interface $peer timeout"
    tries=$((tries+1))
  done

  echo "[wg-watchdog] restarting $interface"
  systemctl restart "wg-quick@$interface"

}

check_peer_activity "$1" "$2"