Ansible filter convert IP to arpaname

arpaname.py

# arpaname.py, (C)2022 by Jan-Piet Mens <[email protected]>
# Convert an IPv4 or IPv6 address in textual form into a string whose value is
# the reverse-map domain name of the address.
#
#     - debug: msg="{{ "192.168.1.3" | arpaname }}"
#           "3.1.168.192.in-addr.arpa."
#
#     - debug: msg="{{ "2001:DB8::7" | arpaname }}"
#           "7.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.8.b.d.0.1.0.0.2.ip6.arpa."

import dns.reversename

def arpaname(ip_addr):
    rev = dns.reversename.from_address(str(ip_addr))
    
    return str(rev)

class FilterModule(object):

    def filters(self):
        return {
            'arpaname' : arpaname,
            'revip'    : arpaname,
        }

- hosts: localhost
  connection: local
  gather_facts: no
  tasks:
     - debug: msg="192.168.1.3 is {{ "192.168.1.3" | arpaname }}"
     - debug: msg="2001:DB8::7 is {{ "2001:DB8::7" | arpaname }}"

TIL that | ansible.utils.ipaddr('revdns') exists.