Give a program to simulate a local DNS client and server. The server has a short table made of two columns domain name and IP address. The client can send two types of requests normal and reverse. The?

To simulate a local DNS client and server, you can use Python's socket library. The server will maintain a dictionary mapping domain names to IP addresses and listen for requests. The client can send a normal request (domain to IP) or a reverse request (IP to domain) and receive the corresponding response. Here's a simple example:

<code class="language-python"># DNS Server
import socket
dns_table = {'example.com': '192.0.2.1', 'example.org': '192.0.2.2'} server = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) server.bind(('localhost', 53))
while True: data, addr = server.recvfrom(1024) request = data.decode().split() if request[0] == 'NORMAL': response = dns_table.get(request[1], 'NOT FOUND') elif request[0] == 'REVERSE': response = next((domain for domain, ip in dns_table.items() if ip == request[1]), 'NOT FOUND') server.sendto(response.encode(), addr)
<h1>DNS Client</h1>
client = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) request_type = 'NORMAL'  # or 'REVERSE' request_value = 'example.com'  # or '192.0.2.1' client.sendto(f"{request_type} {request_value}".encode(), ('localhost', 53)) response, _ = client.recvfrom(1024) print(response.decode())
</code>

This code sets up a basic DNS server and client that can handle normal and reverse DNS queries. Adjust the dns_table as needed for testing.