#!/usr/bin/python

import os, pickle, sys

OUI_ALLOCATIONS="http://standards.ieee.org/regauth/oui/oui.txt"
CACHE_FILE="/home/ianw/.mac2prod.cache"

class MACCache:

    maccache = {}

    def __init__(self, recache):

        if (recache):
            self.setup_cache()
            return
        try:
            f = open(CACHE_FILE, "r")
            unpickler = pickle.Unpickler(f)
            self.maccache = unpickler.load() 
        except:
            self.setup_cache()

    def setup_cache(self):
        f = os.popen("wget --quiet -O - " + OUI_ALLOCATIONS)
        for l in f.readlines():
            if l.find("(hex)") > 0:
                sl = l.split("\t")
                name = sl[2].strip()
                mac = sl[0][0:8].replace("-",":")
                self.maccache[mac] = name

        of = open(CACHE_FILE, 'w')
        pickler = pickle.Pickler(of)
        pickler.dump(self.maccache)


def usage():
    print "usage: mac2prod [-re-cache] 00:00:00:00:00:00"
    sys.exit(1)

if not len(sys.argv):
    usage()

if (sys.argv[1] == "-re-cache"):
    recache = True
    sys.argv.remove(sys.argv[1])
else:
    recache = False

if len(sys.argv[1]) != 17 or len(sys.argv[1].split(":")) != 6 :
    usage()
    
mc = MACCache(recache)

try:
    print mc.maccache[sys.argv[1][0:8].upper()]
except:
    print "Unknown Producer"