#atom

Quick Dynamic Network System protocol for dynamic DNS updates

Core Idea: QDNS (Quick Dynamic Network System) is a lightweight protocol for updating dynamic DNS records, designed to be simpler than GnuDIP while maintaining security and reliability.

Key Elements

Key Features

• Simple text-based protocol
• Minimal resource requirements
• Authentication mechanisms
• Compatible with multiple DNS systems
• Language-independent implementation

Technical Specifications

• Text-based command protocol
• TCP/IP communication
• Simple request-response format
• Authentication through tokens or username/password
• Support for both IPv4 and IPv6 updates

Protocol Design

The QDNS protocol uses simple text commands sent over TCP:

1. Authentication: AUTH [username] [password] or TOKEN [token-value]
2. Update: UPDATE [hostname] [ip-address]
3. Query: QUERY [hostname]
4. Response: Server returns status codes and requested information

Implementation Examples

Server-side implementation (simplified Python):

import socketserver

class QDNSHandler(socketserver.BaseRequestHandler):
    def handle(self):
        data = self.request.recv(1024).strip().decode('utf-8')
        command = data.split(' ')[0]
        
        if command == "AUTH":
            # Handle authentication
            self.request.sendall(b"200 OK\n")
        elif command == "UPDATE":
            # Update DNS record
            hostname = data.split(' ')[1]
            ip = data.split(' ')[2]
            # Update DNS record logic here
            self.request.sendall(b"200 Updated\n")
        elif command == "QUERY":
            # Return IP for hostname
            self.request.sendall(b"200 192.168.1.1\n")

Client update example:

import socket

def update_dns(hostname, ip):
    with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
        s.connect(("qdns-server.example.com", 7393))
        s.sendall(f"AUTH username password\n".encode())
        response = s.recv(1024).decode()
        if "200" in response:
            s.sendall(f"UPDATE {hostname} {ip}\n".encode())
            response = s.recv(1024).decode()
            return "200" in response
    return False

Additional Connections

• Broader Context: Dynamic DNS (QDNS is a protocol for implementing DDNS)
• Applications: Self-hosted DDNS (QDNS can be used for private implementations)
• See Also: GnuDIP (alternative protocol), DNS UPDATE Protocol (RFC 2136)

References

1. QDNS Protocol Specification
2. Open-source implementations on GitHub

#dynamic-dns #networking #protocols #dns #self-hosting

Connections:

Sources:

• From: Worklog n8n.guiom.dev