python - python dns.resolver get DNS record type

Question

I am learning how to use the python dns object. Quick question as I see many examples show methods of using the dns.resolver method with the DNS record type(CNAME, NS, etc). Is there a way to use this dns object to query a DNS name and pull it's resolution with the record type. Similar to what DIG supplies in the answer section.

Thanks,

Jim

Answer 1

你可以得到类型rdatatype

>>> import dns.resolver
>>> answer = dns.resolver.query('google.com')
>>> rdt = dns.rdatatype.to_text(answer.rdtype)
>>> print(rdt)
A

Answer 2

下面是一个 CNAME 示例：

>>> cname = dns.resolver.query("mail.unixy.net", 'CNAME')
>>> for i in cname.response.answer:
...     for j in i.items:
...             print j.to_text()
... 
unixy.net.

TXT：

>>> txt = dns.resolver.query("unixy.net", 'TXT')
>>> for i in txt.response.answer:
...     for j in i.items:
...             print j.to_text()
... 
"v=spf1 ip4:..."

NS：

>>> ns = dns.resolver.query("unixy.net", 'NS')
>>> for i in ns.response.answer:
...     for j in i.items:
...             print j.to_text()
... 
ns2.unixy.net.
ns1.unixy.net.

您可以按照相同的模式获取大多数记录。多个响应查询存储在列表中。所以循环有时是必要的（例如：multiple A 和 NS recs）。

Answer 3

到目前为止，我发现确定它是 A 还是 CNAME 答案的唯一检查是测试 qname 属性是否等于 canonical_name 属性。

answer = dns.resolver.query('www.example.com')
if answer.qname == answer.canonical_name:
    print "This is A record"
else:
    print "This isn't A, probably CNAME..."

Answer 4

这个怎么样？

In [1]: import dns.resolver

In [2]: dns.resolver.query('chipy.org').__dict__
Out[2]: 
{'canonical_name': <DNS name chipy.org.>,
 'expiration': 1304632023.2383349,
 'qname': <DNS name chipy.org.>,
 'rdclass': 1,
 'rdtype': 1,
 'response': <DNS message, ID 64039>,
 'rrset': <DNS chipy.org. IN A RRset>}

Answer 5

看起来您需要推出自己的 Resolver 类。调用 dns.resolver.query 返回的 Answer 对象仅包含与请求特别匹配的记录，默认情况下恰好是 A 记录。一切都在那里，一路上迷路了。如果您打印响应，您可以明白我的意思。

#!/usr/bin/env python

import dns.resolver

answer = dns.resolver.query('www.clarkmania.com')
print answer.response
print "------"
print answer.rrset