#!/usr/bin/env python

import itertools
import ipv4


def overlap(a, b):
    if b.network.numeric_address < a.network.numeric_address:
        a, b = b, a
    return a.network.numeric_address <= b.broadcast.numeric_address and b.network.numeric_address <= a.broadcast.numeric_address


def readNets(filenames):
    for line in itertools.chain(*map(file, filenames)):
        parts = line.strip().split(None, 1)

        net = ipv4.CIDR(parts[0])
        info = parts[1] if len(parts) == 2 else None
        
        yield (net, info)


def getMatches(nets, targets):
    for (net, info) in nets:
        if any([overlap(net, target) for target in targets]):
            yield (net, info)


def main(filenames, targets):
    if not targets:
        return "no target specified"
    else:
        targetnets = map(ipv4.CIDR, targets)
        matches = 0
        for (net, info) in getMatches(readNets(filenames), targetnets):
            print "%s\n\t%s\n" % (net, info)
            matches += 1
        
        print "%d match%s for %s" % (matches, ('es' if matches != 1 else ''), ', '.join(map(str, targetnets)))


if __name__ == '__main__':
    import sys
    from os import path
    from glob import iglob
    
    filenames = iglob(path.join(path.dirname(path.realpath(__file__)), '*.net'))
    
    sys.exit(main(filenames, sys.argv[1:]))