78 lines
2.4 KiB
Bash
78 lines
2.4 KiB
Bash
#!/bin/bash
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# Log file
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log_file="/var/log/watchdog.log"
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# Configuration file
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config_file="/etc/watchdog.conf"
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# Function to update watchdog configuration
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update_watchdog_config() {
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# Extract watchdog IP addresses
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watchdog=$(sudo cat /var/lib/dhcp/* | grep -a "option watchdog" | tail -1 | \
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awk '{for (i=3; i<=NF; i++) printf "%s ", $i}' | tr -d '";')
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IFS=' ' read -r -a ip_array <<< "$watchdog"
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# Backup current configuration
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if sudo cp "$config_file" "$config_file.bak"; then
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echo "Backup of $config_file created successfully." >> "$log_file"
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else
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echo "Failed to create backup of $config_file." >> "$log_file"
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fi
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# Clean existing configurations
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sudo sed -i '/ping/d' "$config_file"
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sudo sed -i '/^interval/d' "$config_file"
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# Set interval
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echo "interval = 60" | sudo tee -a "$config_file" > /dev/null
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if [ ${#ip_array[@]} -eq 0 ]; then
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echo "No IP addresses found. Watchdog configuration cleared." >> "$log_file"
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else
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for ip in "${ip_array[@]}"; do
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echo "ping = $ip" | sudo tee -a "$config_file" > /dev/null
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done
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echo "Configured watchdog to ping: ${ip_array[*]}" >> "$log_file"
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# Restart watchdog service since IP addresses were found
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if sudo systemctl restart watchdog; then
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echo "Watchdog service restarted successfully." >> "$log_file"
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else
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echo "Failed to restart watchdog service." >> "$log_file"
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fi
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return 1 # Indicate that IP addresses were found
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fi
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return 0 # Indicate that no IP addresses were found
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}
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# Main loop
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start_time=$(date +%s)
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end_time=$((start_time + 300)) # 5 minutes in seconds
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interval=30 # Initial interval of 30 seconds
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while true; do
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if update_watchdog_config; then
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echo "IP addresses found and watchdog restarted. Exiting loop." >> "$log_file"
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break # Exit the loop if IP addresses were found
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fi
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current_time=$(date +%s)
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# Check if 5 minutes have passed
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if [ "$current_time" -ge "$end_time" ]; then
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echo "5 minutes have passed. Stopping the watchdog service." >> "$log_file"
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sudo systemctl stop watchdog
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break # Exit the loop
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fi
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echo "Waiting for $interval seconds before checking for IP addresses again..." >> "$log_file"
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sleep $interval
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done
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# Version 1.4:
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# Created 2024 by Tim Eertmoed @ WiS IT-Solutions GmbH, Germany to work on Raspian as custom PXE init script.
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