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#!/usr/bin/env python3 # Usage: reverse.py <zone_filename>... # # This demo script will load in all of the zones specified by the # filenames on the command line, find all the A RRs in them, and # construct a reverse mapping table that maps each IP address used to # the list of names mapping to that address. The table is then sorted # nicely and printed. # # Note! The zone name is taken from the basename of the filename, so # you must use filenames like "/wherever/you/like/dnspython.org" and # not something like "/wherever/you/like/foo.db" (unless you're # working with the ".db" GTLD, of course :)). # # If this weren't a demo script, there'd be a way of specifying the # origin for each zone instead of constructing it from the filename. import dns.zone import dns.ipv4 import os.path import sys from typing import Dict, List # pylint: disable=unused-import reverse_map = {} # type: Dict[str, List[str]] for filename in sys.argv[1:]: zone = dns.zone.from_file(filename, os.path.basename(filename), relativize=False) for (name, ttl, rdata) in zone.iterate_rdatas("A"): print(type(rdata)) try: reverse_map[rdata.address].append(name.to_text()) except KeyError: reverse_map[rdata.address] = [name.to_text()] for k in sorted(reverse_map.keys(), key=dns.ipv4.inet_aton): v = reverse_map[k] v.sort() print(k, v)