update-dyndns-host.py

# -*- coding: utf-8 -*-
import requests
import json
import socket

DDNS_HOST = 'myhost.dyndns.org'
CHEKIP_URL = "http://thisisnt.com/api/getRemoteIp.php"
DDNS_UPDATE_URL = "https://members.dyndns.com/nic/update"

user = "myuser"
password = "mypassword"

print("Obteniendo ip host dyndns")
current_ip_ddns = socket.gethostbyname(DDNS_HOST)
print("obteniendo ip publica...")
request_ip = requests.get(CHEKIP_URL)

if request_ip.status_code is not 200:
  raise "No podemos obtener la ip publica, quiza se deba a un error con su internet"
  exit
  
ip_public = request_ip.json()['REMOTE_ADDR']

print (current_ip_ddns, "--->", ip_public)
if current_ip_ddns != ip_public:
    print(DDNS_HOST, " debe actualizarse")
    headers = {'user-agent': 'mPythonClient/0.0.3'}
    dyn = requests.get(DDNS_UPDATE_URL, headers=headers, auth=(user, password), params={'hostname': DDNS_HOST, 'myip': ip_public, 'wildcard': 'NOCHG',})
    if dyn.status_code is not 200:
        print("La actualización falló", str(dyn.status_code))
    if "good" in dyn.text:
        print("actualizamos correctamente")
    else:
        print("La actualización falló: ", dyn.text.strip())
else:
    print("no es necesario actualizar!!!")

Actualiza automáticamente tu host dyndns con python.