如何使用Python或Bash删除动态DNS记录？

Posted 2021-04-26

python更新中的以下代码

import dns.query
import dns.tsigkeyring
import dns.update
import sys
 keyring = dns.tsigkeyring.from_text({'host-example.' : 'XXXXXXXXXXXXXXXXXXXXXX=='})

update = dns.update.Update('dyn.test.example', keyring=keyring)
update.replace('host', 300, 'a', sys.argv[1])

 response = dns.query.tcp(update, '10.0.0.1')

但我无法找到如何删除dns条目。

答案

delete()的dns.update.Update方法可用于删除记录。

import dns.query
import dns.tsigkeyring
import dns.update

keyring = dns.tsigkeyring.from_text({'host-example.' : 'XXXXXXXXXXXXXXXXXXXXXX=='})
update = dns.update.Update('dyn.test.example', keyring=keyring)
update.delete('host', 'A')
response = dns.query.tcp(update, '10.0.0.1')

另一答案

dns.update.Update的delete方法总是将名称作为第一个参数。其他参数可以是：

• 没有
• rdataset ...
• 哭......
• rdtype，[string ...]

资料来源：http://www.dnspython.org/docs/1.15.0/

要从域_acme-challenge.example.com中删除内容为“Hello World”的特定TXT记录：

import dns.resolver
import dns.tsigkeyring
import dns.update
import dns.query

# Create the rdata object
txt_record = dns.rdata.from_text(dns.rdataclass.IN, dns.rdatatype.TXT, "Hello World")

# Initialize a new DNS update object
update = dns.update.Update('example.com', keyring=keyring)

# Delete the specific record passing in the rdata object
update.delete('_acme-challenge', txt_record)

# Send the request
reponse = dns.query.udp(update, '10.0.0.1', timeout=10)

# Check if the TXT record was successfully removed:
answers = dns.resolver.query('_acme-challenge.example.com', 'TXT')
txt_records = [txt_record.strings[0] for txt_record in answers]
if "Hello World" in txt_records:
    print "TXT record not successfully deleted"
else:
    print "TXT record successfully deleted"