CODEWITHSUNDEEP
pythondnsdnspython
Nigel Lee
Nigel Lee

Reputation: 11

why cannot I get the authority information with dnspython while nslookup is useful

#code like this
import dns
import dns.resolver
import dns.name
import dns.message
import dns.query

request = dns.message.make_query("google.com",dns.rdatatype.NS)
response = dns.query.udp(request,"216.239.32.10")
print response.authority

but it's null

and then when use " nslookup google.com 216.239.32.10 "

can get

Server: 216.239.32.10 Address: 216.239.32.10#53

Name: google.com Address: 216.58.221.238 Obviously,it's an authority answer but why can't I get the authority section when use dnspython?

Upvotes: 1

Views: 2118

Answers (2)

shijimi
shijimi

Reputation: 1

I also encountered the same problem. It turned out to be that some DNS resolvers do not reply with authority or additional sections (Check the packets using Wireshark).

Change the IP address to 127.0.1.1 in your python code and make sure that you have configured your DNS resolver is not pointing to your original resolver (Check cat /etc/resolv.conf).

You should see the authority section in you result.

Upvotes: 0

thebjorn
thebjorn

Reputation: 27311

Are you sure?

c:\srv>nslookup google.com 216.239.32.10
Server:  ns1.google.com
Address:  216.239.32.10

Name:    google.com
Addresses:  2a00:1450:400f:805::200e
          178.74.30.16
          178.74.30.49
          178.74.30.37
          178.74.30.24
          178.74.30.26
          178.74.30.59
          178.74.30.57
          178.74.30.48
          178.74.30.46
          178.74.30.27
          178.74.30.53
          178.74.30.35
          178.74.30.20
          178.74.30.42
          178.74.30.31
          178.74.30.38

c:\srv>python
Python 2.7.10 (default, May 23 2015, 09:40:32) [MSC v.1500 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import dns
>>> import dns.resolver, dns.name
>>> import dns.message, dns.query
>>> r = dns.message.make_query('google.com', dns.rdatatype.NS)
>>> resp = dns.query.udp(r, '216.239.32.10')
>>> print resp.authority
[]
>>> print resp
id 63079
opcode QUERY
rcode NOERROR
flags QR AA RD
;QUESTION
google.com. IN NS
;ANSWER
google.com. 345600 IN NS ns3.google.com.
google.com. 345600 IN NS ns4.google.com.
google.com. 345600 IN NS ns2.google.com.
google.com. 345600 IN NS ns1.google.com.
;AUTHORITY
;ADDITIONAL
ns3.google.com. 345600 IN A 216.239.36.10
ns4.google.com. 345600 IN A 216.239.38.10
ns2.google.com. 345600 IN A 216.239.34.10
ns1.google.com. 345600 IN A 216.239.32.10
>>>

Upvotes: 1

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