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Dir : ~/usr/share/doc/python3-dns/examples/

Edit File: receive_notify.py

#!/usr/bin/env python3

# This is just a toy, real code would check that the received message
# really was a NOTIFY, and otherwise handle errors.

import socket

import dns.flags
import dns.message
import dns.rdataclass
import dns.rdatatype
import dns.name

from typing import cast

address = "127.0.0.1"
port = 53535

s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
s.bind((address, port))
while True:
    (wire, address) = s.recvfrom(512)
    notify = dns.message.from_wire(wire)

try:
        soa = notify.find_rrset(
            notify.answer, notify.question[0].name, dns.rdataclass.IN, dns.rdatatype.SOA
        )

# Do something with the SOA RR here
        print("The serial number for", soa.name, "is", soa[0].serial)
    except KeyError:
        # No SOA RR in the answer section.
        pass

response = dns.message.make_response(notify)  # type: dns.message.Message
    response.flags |= dns.flags.AA
    wire = response.to_wire(cast(dns.name.Name, response))
    s.sendto(wire, address)