Basic socket

dnsserver-basic.py

import socket
# DNS runs on port 53
port = 53
# The host for our DNS server is our local host
host = '127.0.0.1'

# SOCK.AF_INET tells socket to use IPv4 addressing
# SOCK.SOCK_DGRAM tells socket to use UDP 
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)

# This will make our program listen on this host and port.
sock.bind((host, port))

# Infinite loop to keep listening on this port.
# We reed 512 bytes because that is the maximum
# For now we are printing whatever request we get.
while True:
  data, addr = sock.recvfrom(512)
  print(data)