#!/usr/bin/env python
#
# dnsspider.py - multithreaded subdomain bruteforcer
#
# bruteforces subdomains via wordlist or character permutation
# 
# NOTES: quick'n'dirty code
#        
# by noptrix - http://www.noptrix.net/
# improvement by bons
#

# Changelog 
# 
# v0.2:
# - append DNS and IP output to found list
# - added diffound list for subdomains resolved to different addresses
# - get right ip address from current used iface to avoid socket problems
# - fixed socket exception syntax and output
# - added usage note for fixed port and multithreaded socket exception

# v0.1:
# - first release
 
import sys
import time
import string
import itertools
import socket
import threading
import re
from optparse import OptionParser

try:
    import dns.message
    import dns.query
except ImportError:
    print('[-] ERROR: you need "dnspython" package')
    sys.exit()


BANNER = '--------------------------------------\n' \
        'dnsspider.py - http://www.noptrix.net/\n' \
        '--------------------------------------'
USAGE = '\n\n' \
        '  dnsspider.py -t <type> -a <domain> [options]'
VERSION = 'dnsspider.py v0.2'


defaults = {}
hostnames = []
prefix = ''
found = []
diffound = []
chars = string.ascii_lowercase
digits = string.digits
wordlist = ['admin', 'auth', 'backup', 'bm', 'central', 'control', 'cvs',
            'data', 'db', 'dev', 'devel', 'dns', 'external', 'firewall',
            'ftp', 'fw', 'gate', 'gateway', 'gw', 'hpc', 'info', 'internal',
            'intranet', 'it', 'login', 'mail', 'main', 'manage', 'mobile',
            'mx', 'mysql', 'noc', 'ns', 'office', 'op', 'phpmyadmin', 'plesk',
            'private', 'router', 'secure', 'server', 'shop', 'smtp', 'ssh',
            'support', 'svn', 'test', 'update', 'vpn', 'vz', 'web', 'webmail',
            'webshop', 'workstation', 'www']


def usage():
    print('\n' + USAGE)
    sys.exit()


def check_usage():
    if len(sys.argv) == 1:
        print('[-] WARNING: use -h for help and usage')
        sys.exit()


def get_default_nameserver():
    print('[+] getting default nameserver')
    lines = list(open('/etc/resolv.conf', 'r'))
    for line in lines:
        line = string.strip(line)
        if not line or line[0] == ';' or line[0] == '#':
            continue
        fields = string.split(line)
        if len(fields) < 2:
            continue
        if fields[0] == 'nameserver':
            defaults['nameserver'] = fields[1]
            return defaults


def get_default_source_ip():
    print('[+] getting default ip address')
    #try:
    #    defaults['ipaddr'] = socket.gethostbyaddr(socket.gethostname())[2][0]
    #except:
    #    print('''
    #    [-] ERROR: can\'t get your ip-address, use "-i" option and define
    #    yourself
    #    ''')
    #return defaults
    try:
        # get current used iface enstablishing temp socket
        ipsocket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
        ipsocket.connect(("gmail.com",80))
        defaults['ipaddr'] = ipsocket.getsockname()[0]
        print('-[+] found currently used interface ip '+defaults['ipaddr'])
        ipsocket.close()
    except:
            print('''
        [-] ERROR: NO INTERNET? can\'t get your ip-address, use "-i" option and define
        yourself
        ''')
    return defaults


def parse_cmdline():
    p = OptionParser(usage=USAGE, version=VERSION)
    p.add_option('-t', dest='type',
            help='attack type (0 for dictionary 1 for bruteforce)')
    p.add_option('-a', dest='domain',
            help='(sub)domain to bruteforce')
    p.add_option('-l', dest='wordlist',
            help='wordlist, one hostname per line (default predefined in code)')
    p.add_option('-d', dest='dnshost',
            help='choose another nameserver (default your system\'s)')
    p.add_option('-i', dest='ipaddr',
            help='source ip address to use (default your first)')
    p.add_option('-p', dest='port', default=0,
            help='source port to use (default %default --> first free random port)    Note: if fixed port, use max 1 thread!')
    p.add_option('-u', dest='protocol', default='udp',
            help='speak via udp or tcp (default %default)')
    p.add_option('-c', dest='charset', default=0,
            help='choose charset 0 [a-z0-9], 1 [a-z] or 2 [0-9] (default %default)')
    p.add_option('-m', dest='max', default=2,
            help='max chars to bruteforce (default %default)')
    p.add_option('-s', dest='prefix',
            help='give a prefix for bruteforce, e.g. "www" (default none)')
    p.add_option('-o', dest='timeout', default=1,
            help='when to timeout (default %default)')
    p.add_option('-w', dest='wait', default=0,
            help='seconds to wait for next request (default %default)')
    p.add_option('-x', dest='threads', default=32,
            help='number of threads to use (default %default) - choose more :)')
    p.add_option('-r', dest='logfile', default='stdout',
            help='write found subdomains to file (default %default)')
    (opts, args) = p.parse_args()
    return opts


def check_cmdline(opts):
    if not opts.type or not opts.domain:
        print('[-] ERROR: see usage, mount /dev/brain!')
        sys.exit()


def set_opts(defaults, opts):
    if not opts.dnshost:
        opts.dnshost = defaults['nameserver']
    if not opts.ipaddr:
        opts.ipaddr = defaults['ipaddr']
    if int(opts.charset) == 0:
        opts.charset = chars + digits
    elif int(opts.charset) == 1:
        opts.charset = chars
    else:
        opts.charset = digits
    if not opts.prefix:
        opts.prefix = prefix
    return opts


def read_hostnames(opts):
    print('[+] reading hostnames')
    hostnames = []
    if opts.wordlist:
        hostnames = list(open(opts.wordlist, 'r'))
        return hostnames
    else:
        return wordlist


def attack(opts, hostname, attack_pool):
    sys.stdout.write('--- trying %s \n' % hostname)
    sys.stdout.flush()
    try:
        x = dns.message.make_query(hostname, 1)
        if opts.protocol == 'udp':
            a = dns.query.udp(x, opts.dnshost, float(opts.timeout), 53, None,
                    opts.ipaddr, int(opts.port), True, False)
        else:
            a = dns.query.tcp(x, opts.dnshost, float(opts.timeout), 53, None,
                    opts.ipaddr, int(opts.port), False)
        attack_pool.release()
    except dns.exception.Timeout:
        sys.exit()
    except socket.error, e:
        print('''[-] ACTUNGSCHEISSE! Socket Error! NO INTERNET? ip|srcport incorrectly defined? 
        you can run only one thread if fixed source port specified''')
        print e
        sys.exit()
    if a.answer:
        answ = ''
        # iterate dns rrset answer (can be multiple sets) field to extract detailed info (dns and ip) 
        for i in a.answer:
            answ += str(i[0])
            answ += ' '
        answer = (hostname,answ)
        # append mergedtuple to found list
        found.append(answer)
    else:
        pass


def str_gen(opts, hostnames):
    print('[+] generating list of strings')
    tmp_hostnames = itertools.product(opts.charset, repeat=int(opts.max))
    hostnames = list(tmp_hostnames)
    hostnames = map(''.join, hostnames)
    return hostnames


def run_threads(opts, hostname, attack_pool, threads):
    t = threading.Thread(target=attack, args=(opts, hostname, attack_pool))
    attack_pool.acquire()
    t.start()
    threads.append(t)
    return threads


def prepare_attack(opts, hostnames):
    sys.stdout.write('[+] attacking \'%s\' via ' % opts.domain)
    threads = list()
    attack_pool = threading.BoundedSemaphore(value=int(opts.threads))
    if opts.type == '0':
        sys.stdout.write('dictionary\n')
        for hostname in hostnames:
            hostname = hostname.rstrip() + '.' + opts.domain
            time.sleep(float(opts.wait))
            threads = run_threads(opts, hostname, attack_pool, threads)
        for t in threads:
            t.join()
    elif opts.type == '1':
        sys.stdout.write('bruteforce\n')
        hostnames = str_gen(opts, hostnames)
        for hostname in hostnames:
            hostname = opts.prefix + hostname + '.' + opts.domain
            time.sleep(float(opts.wait))
            threads = run_threads(opts, hostname, attack_pool, threads)
        for t in threads:
            t.join()
    else:
        print('[-] ERROR: unknown attack type')
        sys.exit()

def ip_extractor(ip):
    #extract ip from string of rrset answer object
    extracted = re.findall( r'[0-9]+(?:\.[0-9]+){3}', ip )
    return extracted[0]

def analyze_results(opts, found):
    #get maindomain ip
    mainhostip = socket.gethostbyname(opts.domain)
    #append domain|ip to diffound if subdomain ip different than starting domain ip
    ([diffound.append(domain+' | '+ip) for domain,ip in found if ip_extractor(ip) != mainhostip])
    

def log_results(opts, found, diffound):
    print('[+] game over')
    if opts.logfile == 'stdout':
        print('---')
        if not found:
            print('no hosts found :(')
        else:
            print('ANSWERED DNS REQUESTS:')
            print('---')
            for f in found:
                print(f[0]+' | '+f[1])
        if not diffound:
            print('---')
            print('NO HOSTS WITH DIFFERENT IP FOUND :(')
        else:
            print('---')
            print('ANSWERED DNS REQUEST WITH DIFFERENT IP:')
            print('---')
            for domain in diffound:
                print domain
    else:
        print('[+] logging results to %s') % opts.logfile
        with open(opts.logfile, 'w') as f:
            if found:
                f.write('ANSWERED DNS REQUESTS:\n')
                f.write('---\n')
                for x in found:
                    f.write('Domain: '+x[0]+' | '+x[1]+ '\n')
            if not diffound:
                f.write('---\n')
                f.write('NO HOSTS WITH DIFFERENT IP FOUND :(\n')
            else:
                f.write('---\n')
                f.write('ANSWERED DNS REQUEST WITH DIFFERENT IP:\n')
                f.write('---\n')
                for domain in diffound:
                    
                    f.write(domain+ '\n')
        f.close()


def main():
    check_usage()
    opts = parse_cmdline()
    check_cmdline(opts)
    if not opts.dnshost:
        defaults = get_default_nameserver()
    if not opts.ipaddr:
        defaults = get_default_source_ip()
    opts = set_opts(defaults, opts)
    hostnames = read_hostnames(opts)
    prepare_attack(opts, hostnames)
    analyze_results(opts, found)
    log_results(opts, found, diffound)


if __name__ == '__main__':
    try:
        print(BANNER)
        main()
    except KeyboardInterrupt:
        print('\n[-] WARNING: aborted by user')
        raise SystemExit

# EOF