Creating a dynamic DNS (Domain Name System) service in Python involves several components: a server that listens for DNS queries, a database to store mappings between domain names and IP addresses, and functionality to update these mappings dynamically. Below is a simple example of a Python-based dynamic DNS service using Flask, a lightweight web framework, and SQLite, a simple SQL database. from flask import Flask, request, jsonify
import sqlite3
app = Flask(__name__)
DATABASE = 'dns.db'
def init_db():
conn = sqlite3.connect(DATABASE)
cursor = conn.cursor()
cursor.execute('''
CREATE TABLE IF NOT EXISTS dns_records (
domain TEXT PRIMARY KEY,
ip_address TEXT
)
''')
conn.commit()
conn.close()
@app.route('/update_dns', methods=['POST'])
def update_dns():
data = request.get_json()
domain = data.get('domain')
ip_address = data.get('ip_address')
if not domain or not ip_address:
return jsonify({'message': 'Domain and IP address are required.'}), 400
conn = sqlite3.connect(DATABASE)
cursor = conn.cursor()
cursor.execute('INSERT OR REPLACE INTO dns_records (domain, ip_address) VALUES (?, ?)', (domain, ip_address))
conn.commit()
conn.close()
return jsonify({'message': f'DNS record for {domain} updated successfully.'})
@app.route('/resolve_dns', methods=['GET'])
def resolve_dns():
domain = request.args.get('domain')
if not domain:
return jsonify({'message': 'Domain is required.'}), 400
conn = sqlite3.connect(DATABASE)
cursor = conn.cursor()
cursor.execute('SELECT ip_address FROM dns_records WHERE domain=?', (domain,))
result = cursor.fetchone()
conn.close()
if result:
return jsonify({'ip_address': result[0]})
else:
return jsonify({'message': 'Domain not found.'}), 404
if __name__ == '__main__':
init_db()
app.run(debug=True)
This code sets up a basic Flask web application with two endpoints: - /update_dns: This endpoint allows clients to update DNS records by sending a POST request with JSON data containing the domain name and corresponding IP address.
- /resolve_dns: This endpoint resolves DNS queries by accepting a domain name as a query parameter and returning the associated IP address.
The DNS records are stored in an SQLite database named dns.db. The init_db() function initializes the database by creating a table named dns_records if it doesn't already exist. To run this code: - Install Flask (pip install Flask).
- Save the code in a file (e.g., dynamic_dns.py).
- Run the file (python dynamic_dns.py).
- The server will start, and you can use tools like cURL or Postman to send requests to the /update_dns and /resolve_dns endpoints.
Please note that this example is for educational purposes and lacks several features found in a production-grade dynamic DNS service, such as authentication, rate limiting, and error handling. Tags: DNS Database Management Dynamic DNS Flask Networking Python SQLite Server Management Tutorial Web Development
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