gen_subdomains

#!/usr/bin/env python3

import os
import sys
import argparse

if __name__ == '__main__':
    desc = 'Generate wordlists for DNS brute forcing.'

    parser = argparse.ArgumentParser(description=desc)
    parser.add_argument('-w', '--wordlist',
                        nargs='?',
                        type=argparse.FileType('r'),
                        action='store',
                        help='a list of words to use for brute force attack (default: %s/wordlists/dns/hostnames.txt)' % os.path.   dirname(os.path.realpath(__file__)),
                        metavar='FILE',
                        default="%s/wordlists/dns/hostnames.txt" % os.path.dirname(os.path.realpath(__file__)))
    parser.add_argument('file',
                        nargs='?',
                        type=argparse.FileType('r'),
                        action='store',
                        help='file containing a list of hostnames split by a newline, otherwise read from STDIN',
                        metavar='FILE',
                        default=sys.stdin)
    args = parser.parse_args()

    wordlist = [line.strip().lower() for line in args.wordlist if len(line)>0 and line[0] != '#']
    domains = [line.strip().lower() for line in args.file if len(line)>0 and line[0] != '#']

    for domain in domains:
        for word in wordlist:
            if not word.strip(): 
                continue
            print('{}.{}'.format(word.strip(), domain.strip()))