#!/bin/bash

# Log file
log_file="/var/log/watchdog.log"

# Extract watchdog IP addresses
watchdog=$(sudo cat /var/lib/dhcp/* | grep -a "option watchdog" | tail -1 | \
awk '{for (i=3; i<=NF; i++) printf "%s ", $i}' | tr -d '";')
IFS=' ' read -r -a ip_array <<< "$watchdog"

# Configuration file
config_file="/etc/watchdog.conf"

# Backup current configuration
if sudo cp "$config_file" "$config_file.bak"; then
    echo "Backup of $config_file created successfully." >> "$log_file"
else
    echo "Failed to create backup of $config_file." >> "$log_file"
fi

# Clean existing configurations
sudo sed -i '/ping/d' "$config_file"
sudo sed -i '/^interval/d' "$config_file"

# Set interval
echo "interval = 60" | sudo tee -a "$config_file" > /dev/null

if [ ${#ip_array[@]} -eq 0 ]; then
    echo "No IP addresses found. Watchdog configuration cleared." >> "$log_file"
    sudo systemctl stop watchdog
else
    for ip in "${ip_array[@]}"; do
        echo "ping = $ip" | sudo tee -a "$config_file" > /dev/null
    done
    echo "Configured watchdog to ping: ${ip_array[*]}" >> "$log_file"
fi

# Restart watchdog service
if sudo systemctl restart watchdog; then
    echo "Watchdog service restarted successfully." >> "$log_file"
else
    echo "Failed to restart watchdog service." >> "$log_file"
fi

#  Version 1.1:
#  Created 2024 by Tim Eertmoed @ WiS IT-Solutions GmbH, Germany to work on Raspian as custom pxe init script.