bruteforce.py

from subprocess import Popen, PIPE
import sys
import argparse

key = "qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM"
parser = argparse.ArgumentParser()

parser.add_argument('--dest', dest='pass_to_program', action='store', default=False,
                   help='program destination')
parser.add_argument('--max', dest='max_length', action='store', type=int, default=3,
                   help='Maxlength of bf')
parser.add_argument('--min', dest='min_length', action='store', type=int, default=1,
                   help='Maxlength of bf')

arg = parser.parse_args()

res = []

a = 0
def func(depth):
    global a
    for i in key:
        res[a] = i
        if a < depth-1:
            a += 1
            func(depth)
        else:
            new_key = "".join(res)

            if arg.pass_to_program:
                sys.stdout.write(new_key+": ")

                result = Popen([arg.pass_to_program, ""], stdout=PIPE, stdin=PIPE)
                out = result.communicate(new_key)
                print out
            else:
                print new_key
    a -= 1

if arg.min_length > arg.max_length:
    print "{0} : max length is smaller than min length!".format(sys.argv[0])
    exit(0)

# initializing result objects
for i in xrange(0, arg.max_length):
    res.append("")


for i in xrange(arg.min_length, arg.max_length+1):
    a = 0
    func(i)