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#!.\venv\Scripts\python.exe
# -*- coding: utf-8 -*-
#
# for Python version 3.10
# Author：William Huang
# Date：2022/10/06
# program：checkdns.py
# pip install dnspython
# Ref.
# https://pypi.org/project/dnspython/
# https://dnspython.readthedocs.io/en/stable/resolver-class.html
import dns.resolver
from time import sleep, ctime
# DNS查詢的網域名稱
dm = ".yourname.com"
# DNS查詢的主機名稱，加上網域名稱，即 FQDN
dnsa = ['www', 'eip', 'cms', 'erp']
# DNS伺服器IPs
nsl = ['dns-ip1', 'dns-ip2', 'dns-ip3', 'dns-ip4']
# 產生Resolver物件
resl = dns.resolver.Resolver(configure=False)
# 持續執行不中止
while True:
＃ 逐一對DNS伺服器，查詢FQDN
for ns in nsl:
# 一次設定一個，用於查詢的DNS伺服器
resl.nameservers = [ns]
# 逐一查詢主機名稱
for nm in dnsa:
# 將主機名稱和網域名稱合併成FQDN
tmp = nm + dm
# 錯誤處理
try:
＃ 查FQDN的A記錄
result = resl.resolve(tmp, 'A')
# 輸出查詢結果
for ipval in result:
print(nm + "'s IP=", ipval.to_text())
except Exception as e:
# 列印錯誤訊息
# 請自行增加：出現錯誤，發email alert功能
print(e)
＃ 輸出用於查詢的DNS伺服器與當下時間
print('NS = ' + ns + " ---- " + ctime())
# 休息60秒
sleep(60)
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