convert pihole dnsmasq static dhcp hosts to isc-kea kea dhcp-server json format

dnsmasq2kea.sh

#!/bin/bash

# Check if jq is installed
if ! command -v jq &> /dev/null; then
  echo "Error: jq is not installed. Please install jq using 'sudo apt install jq'"
  exit 1
fi

# Source the dnsmasq static DHCP list
static_leases=$(cat /etc/dnsmasq.d/04-pihole-static-dhcp.conf)

# Define output file
output_file="/etc/kea/kea-dhcp4.conf"

# Start the JSON structure for reservations
echo '{ "reservations": [' > "$output_file"

# Process each line in the dnsmasq static DHCP list
while IFS= read -r line; do
  # Extract the MAC address, IP address, and hostname from the line
  mac_address=$(echo "$line" | cut -d',' -f1 | cut -d'=' -f2 | xargs)
  ip_address=$(echo "$line" | cut -d',' -f2 | xargs)
  hostname=$(echo "$line" | cut -d',' -f3- | xargs)

  # Create a JSON object for the static lease
  json_object="{ \"hw-address\": \"$mac_address\", \"ip-address\": \"$ip_address\", \"hostname\": \"$hostname\" }"

  # Append the JSON object to the output file with a newline
  echo "  $json_object," >> "$output_file"
done <<< "$static_leases"

# Remove the trailing comma from the last entry
sed -i '$ s/,$//' "$output_file"

# Close the JSON array
echo "]}" >> "$output_file"

echo "Kea DHCP4 configuration file ($output_file) updated successfully."