监控外网访问域名解析

import dns.resolver
import time

def check_domain_resolution(domain):
    try:
        answers = dns.resolver.resolve(domain, 'A')
        for rdata in answers:
            print(f"{domain} resolved to {rdata.address}")
        return True
    except dns.resolver.NXDOMAIN:
        print(f"{domain} does not exist.")
        return False
    except dns.resolver.NoAnswer:
        print(f"{domain} has no A records.")
        return False
    except dns.resolver.Timeout:
        print(f"Timeout while resolving {domain}.")
        return False
    except Exception as e:
        print(f"An error occurred: {e}")
        return False

if __name__ == "__main__":
    domain = "example.com"
    while True:
        if check_domain_resolution(domain):
            print("Domain resolution successful.")
        else:
            print("Domain resolution failed.")
        time.sleep(60)  # 每分钟检查一次