A wrapper around dnspython.
The wrapper adds two sets of functionality.
Firstly, it provides a single cache object, whenever possible, that is used throughout the lifetime of the process. This maximises the use of the cached information, without having to pass a cache object around to different parts of the code. The code handles the case where the timeout for the cache is different, without the caller needing to manage that.
Secondly, it includes a transparent shortcut for various DNSBL lookups where we have a mirror of the list, and the list provides only a "yes listed" or "no not listed" response (or if it provides more responses, we are not interested in them). It does this by looking up the value in a "combined" result, which provides results for many different lists, for the first lookup, and then uses that information for all subsequent checks. From the caller's point of view, the original list is being checked.
The default config_path for these lists is hardcoded to /etc/combined_lists.json.
The config path has the following structure:
{
"COMBINED": "",
"COMBINED_URL": "",
"COMBINED_DNSBL": {},
"COMBINED_DNSBL_REVERSE": {},
"COMBINED_URLBL": {},
"COMBINED_URLBL_REVERSE": {}
}This code was originally based on the dnscache in SpamBayes.
git clone git@github.com:Spamexperts/se-dns.git
cd se-dns/
pip install . --upgrade #
pip install -r requirements/tests.txt
pip install -r requirements/base.txt
Create a script to retrieve the ip of a given hostname
"""All the imports make sure the package works in python3"""
import se_dns
from se_dns import dnsutil
from se_dns.dnsutil import DNSCache
import sys
"""This part should return the ipv4 of the hostname passed as parameter"""
look_up = DNSCache()
print(look_up.lookup(question=sys.argv[1]))
Execute the script
python your_script.py example.com
You can find an example here