我们如何从 dnspython 获取 TXT、CNAME 和 SOA 记录? [英] How do we get TXT, CNAME and SOA records from dnspython?

问题描述

我需要一个 dns 查询功能来查询服务器的各种记录.我想出了如何获取 MX 记录(大多数示例都展示了这一点)、A 记录和 NS 记录.如何获取 TXT、CNAME 和 SOA 记录?

I have a requirement to have a dns query function to query a server for various records. I figured out how to get the MX record (most of the examples show this), A record and NS record. How do I get the TXT, CNAME and SOA records?

示例代码片段:

   import dns.resolver
   answer=dns.resolver.query("google.com", "A")
       for data in answer:
           print data.address

我尝试用 TXT 替换查询类型，用 data.text、data.data 等替换 data.address 对象，但最终出现属性错误.我前面提到的数据类型的引用是什么?

I tried replacing the query type with TXT and the data.address object with data.text, data.data etc, but ended up with attribute errors. What are the references for the data types I mentioned earlier?

推荐答案

(回答如何计算返回的数据)

(To answer how you can figure out the returned data)

您可以通过类似的方式获取 TXT、CNAME 和 SOA 记录，但您只需要根据 DNS 响应对象获取正确的属性即可.

You can get the TXT, CNAME, and SOA records a similar way but you just have to get the correct attributes depending on the DNS response object.

使用内置的 python dir() 是您的朋友，也是找出 DNS 响应对象中存在哪些属性的一种方法 - 在 API 文档不可用时很方便.

Using the python dir() built-in is your friend and one way to figure out what attributes exist in the DNS response object - handy when API documentation is not available.

要找出适当的属性，请将您的 for 循环暂时更改为以下内容:

To figure out the appropriate attributes, change your for loop temporarily to the following:

   for data in answer:
       print dir(data)
       print data

另一种更快的方法是查看 dnspython 的 API 文档，这些页面列出了每个返回对象的属性.

Another and quicker way is to look at the API documentation for dnspython, these pages list the attributes for each returned object.

最后，如果库在 python 中，您可以查看源代码，如果没有，则可以查看 C 代码是否可用.

Lastly, you could look at the source if the library is in python or if not, then if the C code is available.

(并回答您的问题:)

以下是 TXT、CNAME 和 SOA 查询的示例:

文本

http://www.dnspython.org/docs/1.15.0/dns.rdtypes.txtbase.TXTBase-class.html#section-InstanceVariables

answers = dns.resolver.query('google.com', 'TXT')
print ' query qname:', answers.qname, ' num ans.', len(answers)
for rdata in answers:
    for txt_string in rdata.strings:
      print ' TXT:', txt_string

CNAME

http://www.dnspython.org/docs/1.15.0/dns.rdtypes.ANY.CNAME.CNAME-class.html

answers = dns.resolver.query('mail.google.com', 'CNAME')
print ' query qname:', answers.qname, ' num ans.', len(answers)
for rdata in answers:
    print ' cname target address:', rdata.target

SOA

http://www.dnspython.org/docs/1.15.0/dns.rdtypes.ANY.SOA.SOA-class.html#section-InstanceVariables

answers = dns.resolver.query('google.com', 'SOA')
print 'query qname:', answers.qname, ' num ans.', len(answers)
for rdata in answers:
    print ' serial: %s  tech: %s' % (rdata.serial, rdata.rname)
    print ' refresh: %s  retry: %s' % (rdata.refresh, rdata.retry)
    print ' expire: %s  minimum: %s' % (rdata.expire, rdata.minimum)
    print ' mname: %s' % (rdata.mname)

这篇关于我们如何从 dnspython 获取 TXT、CNAME 和 SOA 记录?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！