4lw

#!/usr/bin/env python

# written by magical
# based on http://blog.rabidgremlin.com.nyud.net/2010/11/28/4-little-words/
# licensed under WTFPL
# works with python2 and python3

WORDS = [ "A", "AID", "ANA", "ARC", "AT", "AWN", "BAR", "BET", "BOG", "BUG", "CAB", "COD", "COY", "DAD",
 "DES", "DOE", "DUE", "EGO", "ETC", "FAT", "FIR", "FUM", "GAP", "GIL", "GUY", "HAP", "HER", "HIT", "HOW", "ICY", "ION",
 "IVY", "JET", "JOY", "KIM", "LAM", "LEN", "LIT", "LOW", "MAN", "MEL", "MOD", "MUG", "NAY", "NIP", "NOV", "OAR", "OIL",
 "ORR", "OWL", "PAP", "PEP", "PIT", "PRO", "RAG", "RED", "RIP", "RUB", "SAG", "SEA", "SIN", "SO", "SPY", "TAD", "TEN",
 "TO", "TOY", "UP", "WAG", "WET", "WOW", "YES", "ACHE", "ADEN", "AIDS", "ALLY", "AMES", "ANNA", "ARGO", "AUNT", "AWAY",
 "BAIT", "BAND", "BARN", "BAWD", "BEAU", "BELT", "BETA", "BILL", "BLED", "BLUR", "BOHR", "BONE", "BORE", "BOYD", "BRIG",
 "BULL", "BURT", "CAFE", "CANE", "CASH", "CHAD", "CHIN", "CLAD", "CLUB", "CODE", "COLT", "CORD", "CRAG", "CUBE", "CURL",
 "DANG", "DATE", "DEAN", "DEFY", "DIET", "DISH", "DOME", "DOUR", "DRUB", "DUKE", "EACH", "EDDY", "ELBA", "EROS", "FAIL",
 "FAST", "FELL", "FILE", "FISH", "FLAT", "FLOW", "FOLK", "FORK", "FRAY", "FULL", "GAGE", "GAME", "GAVE", "GIBE", "GIST",
 "GLOW", "GOES", "GORY", "GREW", "GULF", "HAAG", "HALO", "HARM", "HAWK", "HEED", "HERE", "HIKE", "HOBO", "HONE", "HOST",
 "HUFF", "HURD", "IDEA", "IOWA", "JACK", "JERK", "JOBS", "JOVE", "JUNE", "KANE", "KERN", "KISS", "KNOW", "LACK", "LAME",
 "LATE", "LEAK", "LENT", "LICK", "LILA", "LINK", "LOAM", "LONG", "LOST", "LULU", "LYLE", "MAIL", "MANN", "MASH", "MEAD",
 "MEMO", "MILD", "MINI", "MOAN", "MONA", "MORN", "MUDD", "MUTT", "NASH", "NEIL", "NIBS", "NOEL", "NOUN", "ODIN", "OLIN",
 "ONUS", "OUTS", "QUOD", "RAIN", "RAYS", "REEK", "RICE", "RINK", "ROCK", "ROOM", "ROVE", "RULE", "RUST", "SALK", "SAUL",
 "SEAM", "SELF", "SHAW", "SHOW", "SILK", "SITE", "SKIT", "SLIM", "SLUR", "SOAK", "SOME", "SOWN", "STIR", "SUMS", "SWAN",
 "TAKE", "TEAL", "TEND", "THEE", "TICK", "TIME", "TOIL", "TOOT", "TRAM", "TROT", "TUNE", "ULAN", "VAIN", "VEIN", "VINE",
 "WAIL", "WANE", "WAST", "WEAN", "WENT", "WHET", "WINE", "WOLF", "WORN", "YARN"
 ]

class WordError(ValueError):
    def __init__(self, word):
        self.word = word

def words2ip(words):
    ip = []
    for w in words:
        w_ = w.upper().strip()
        try:
            n = WORDS.index(w_)
        except ValueError:
            raise WordError(w)
        ip.append(n)

    return '.'.join(str(n) for n in ip)

def ip2words(ip):
    words = [WORDS[n] for n in ip]
    return words

def splitip(ip):
    if ip.count('.') != 3:
        raise ValueError(ip)
    return list(map(int, ip.split('.')))

from sys import argv, exit, stdout, exc_info

args = argv[1:]

if len(args) == 4:
    try:
        print(words2ip(args))
        exit(0)
    except WordError:
        import sys
        e = exc_info()[1]
        stdout.write("unknown word: %s\n" % str(e.word))
        exit(1)
elif len(args) == 1:
    arg = args[0]
    if arg == '-h' or arg == '--help':
        pass
    elif '.' in arg:
        try:
            ip = splitip(arg)
            try:
                words = ip2words(ip)
            except ValueError:
                stdout.write("invalid ip: %s\n" % arg)
                exit(1)
        except ValueError:
            import socket
            try:
                ip = socket.gethostbyname(arg)
            except socket.error:
                e = exc_info()[1]
                stdout.write(str(e))
                stdout.write("\n")
                exit(1)

            ip = splitip(ip)
        words = ip2words(ip)
        print(' '.join(words))
        exit(0)
    else:
        words = arg.split()
        try:
            ip = words2ip(words)
        except WordError:
            e = exc_info()[1]
            stdout.write("unknown word: %s\n" % str(e.word))
            exit(1)
        else:
            print(ip)
            exit(0)

stdout.write("Usage: 4lw [ip]\n       4lw [host]\n       4lw [words]\n")
exit(1)