[Python] お名前ドットコムのDNS更新スクリプト

#!/usr/bin/env python3

import ssl
import json
import socket
import urllib.request
import datetime
import os
from dotenv import load_dotenv

# .env ファイルの内容を環境変数に読み込む
load_dotenv()

# OnamaeID/Pass
user_id=os.getenv("USER_ID")
password=os.getenv("PASSWORD")

# サブドメインとメインドメイン
sub_domains=[
    "",
    "sub"
    ]
domname="example.com"

# inet-ipのAPIでIPアドレスを取得する
def getip():
    url = "http://inet-ip.info/ip"
    req = urllib.request.Request(url)
    res = urllib.request.urlopen(req)
    ip = res.read().decode()

    return ip

# DNS更新API URL
def getdns(domain):
    url = "https://dns.google.com/resolve?name={domain}&type=A".format(domain=domain)
    req = urllib.request.Request(url)
    res = urllib.request.urlopen(req)
    data = json.loads(res.read().decode())
    return data["Answer"][0]["data"]

# IPアドレスの更新
def updateip(ip):
    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    sock.settimeout(10)
    s = ssl.wrap_socket(sock)
    s.connect(("ddnsclient.onamae.com", 65010))
    #print(s.recv(1024).decode())

    data = """LOGIN
USERID:{uid}
PASSWORD:{pwd}
.
MODIP
HOSTNAME:{h}
DOMNAME:{domain}
IPV4:{ip}
.
LOGOUT
.""".format(uid=user_id,pwd=password,h=sub_domain,domain=domname,ip=ip)

    print("DATA STRINGS:\n", data)

    for line in data.split("\n"):
        s.send(line.encode() + b"\r\n")
        if line == ".":
            print(s.recv(1024).decode())

    s.close()

## Main function
if __name__ == "__main__":
    dt_now = datetime.datetime.now()
    print(dt_now.strftime('%Y年%m月%d日 %H:%M:%S'))

    current_ip = getip()
    print("Current Global IP:", current_ip)

    # Set host name
    for sub_domain in sub_domains:

        # Host check
        if sub_domain != "":
            print("Target Host Name:", sub_domain + "." + domname)
            dns_record_ip = getdns(sub_domain + "." + domname)
        else:
            print("Target Host Name:", domname)
            dns_record_ip = getdns(domname)

        print("DNS Registered IP:", dns_record_ip)

        if dns_record_ip == current_ip:
            print("No update is required.")
        else:
            print("Sending update request...")
            updateip(current_ip)
            print("The request is completed.")

USER_ID="onamae_user_id"
PASSWORD="onamae_password"