python module for nslookup

Question

Is there a python-module that\'s doing the same stuff as nslookup does? I am planning to use nslookup on digging some information regarding the domain of a URL to be scrappe

Answer 1

You need to use DNSPython

import dns.resolver

answers = dns.resolver.query('dnspython.org', 'MX')
for rdata in answers:
    print 'Host', rdata.exchange, 'has preference', rdata.preference

Answer 2

You should use socket library http://docs.python.org/2/library/socket.html

System function call is not a good practice in this case.

Answer 3

Note that socket.getfqdn() can return the full-qualified name of a hostname. See: http://docs.python.org/2/library/socket.html?highlight=socket.getaddrinfo#socket.getfqdn

For example:

python -c  'import socket; print(socket.gethostname()); print(socket.getfqdn());'
myserver
myserver.mydomain.local

But the result depends the /etc/hosts configuration. If you have:

$ cat /etc/hosts
127.0.0.1       myserver  localhost.localdomain  localhost

The result of socket.getfqdn() will be:

python -c  'import socket; print(socket.getfqdn());'
localhost.localdomain

Oooops! To solve that, the only solution I know is to change the /etc/hosts as follow:

$ cat /etc/hosts
127.0.0.1       myserver  myserver.mydomain.local  localhost.localdomain  localhost

Hope it helps!