#!/usr/bin/env python3

import http.server
import argparse

class DNSUpdateHandler(http.server.BaseHTTPRequestHandler):
    def do_GET(self):
        self.send_response(200)
        self.send_header('Content-type', 'text/plain')
        self.end_headers()
        self.wfile.write(b'DNS Update Service is running.\n')

def run(server_class=http.server.HTTPServer, handler_class=DNSUpdateHandler, address='127.0.0.1', port=8080):
    server_address = (address, port)
    httpd = server_class(server_address, handler_class)
    print(f'Starting DNS Update Service on {address}:{port}...')
    httpd.serve_forever()

if __name__ == "__main__":
    parser = argparse.ArgumentParser(description='Run the DNS Update Service.')
    parser.add_argument('--port', type=int, default=8080, help='Port to run the server on')
    parser.add_argument('--address', type=str, default='127.0.0.1', help='IP address to listen on (not used in this simple example)')
    args = parser.parse_args()

    try:
        run(address=args.address, port=args.port)
    except KeyboardInterrupt:
        print("\nShutting down DNS Update Service.")