如何应对域名劫持

import dns.resolver
import hashlib

def get_dns_record(domain, record_type):
    try:
        answers = dns.resolver.resolve(domain, record_type)
        return [answer.to_text() for answer in answers]
    except dns.resolver.NXDOMAIN:
        return None
    except dns.resolver.NoAnswer:
        return None
    except dns.resolver.Timeout:
        return None

def check_dns_record(domain, record_type, expected_value):
    current_value = get_dns_record(domain, record_type)
    if current_value and current_value[0] == expected_value:
        return True
    else:
        return False

def main():
    domain = "example.com"
    record_type = "A"
    expected_value = "192.168.1.1"

    if check_dns_record(domain, record_type, expected_value):
        print("DNS记录未被篡改")
    else:
        print("DNS记录已被篡改，请立即采取措施")

if __name__ == "__main__":
    main()