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#!/usr/bin/env python

# 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

reverse_map = {}

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'):

try:

reverse_map[rdata.address].append(name.to_text())

except KeyError:

reverse_map[rdata.address] = [name.to_text()]

keys = reverse_map.keys()

keys.sort(lambda a1, a2: cmp(dns.ipv4.inet_aton(a1), dns.ipv4.inet_aton(a2)))

for k in keys:

v = reverse_map[k]

v.sort()

print k, v