Python script for updating google domains dyndns entries

update-dns.py

import requests
import psutil
import socket
import click
import pprint
import numpy as np


INTERFACES = psutil.net_if_addrs()

@click.command()
@click.option('--iface',    prompt='interface', default='eth1')
@click.option('--user',     prompt='username',  default="")
@click.option('--passwd',   prompt='pass',      default='')
@click.option('--domain',   prompt='domain',    default='symlink.pw')
@click.option('--hostname', prompt='hostname',  default=socket.gethostname())

def update(iface, user,passwd,domain,hostname):

    # iface='enp9s0'
    interfaces = psutil.net_if_addrs()
    inet_ip = interfaces[iface][0].address
    auth='{}:{}'.format(user,passwd)

    host = 'domains.google.com'
    endpoint = '/nic/update'

    url='https://{}@{}{}'.format(auth,host,endpoint)
    print('POST: ',url)
    print()
    payload = {
            'hostname':'{}.{}'.format(hostname,domain),
            'myip':inet_ip,
            }
    print(payload)
    print()

    r = requests.post(url, params=payload)

    print('response:')
    print()
    print(r.text)

if __name__ == '__main__':
    pp = pprint.PrettyPrinter(indent=4)
    exclude = ['docker','lo']

    interfaces = psutil.net_if_addrs()
    ex = [[k.startswith(e) for k in interfaces.keys()] for e in exclude]

    # keys = np.array(interfaces.keys())[np.logical_or(*ex)]
    keys = interfaces.keys()
    interfaces = {k:interfaces[k][0].address for k in keys}
    print('interfaces:')
    pp.pprint(interfaces)

    update()