CODEWITHSUNDEEP
pythonhashcat
friluk
friluk

Reputation: 1

continuous read from subprocess.Popen

In Python, I have a question about the subprocess.Popen function, my problem is that I can't get my head around a continuous read of stdout stream. When I use communicate() at the end of my function, I get my preferred output. But I have two problems here. First, communicate() buffers the whole output before it prints anything and it would be nice to get an continuous output. Second, I had read in the communicate() documentation that communicate() isn't meant for big data streams which is in my scenario the case.

#!/usr/bin/python

import os
import sys
from subprocess import *
import itertools


def combinate(hash_mode,hash_file,directory):
erg = Popen(['hashcat', '-a', '0', '-m', hash_mode, hash_file, '-O', '--potfile-disable'],
                     stdin=PIPE,
                     stdout=PIPE,
                     stderr=PIPE,
                     universal_newlines=True)
file = []
with os.scandir(directory) as listOfEntries:
    for entry in listOfEntries:
        if entry.is_file() and entry.name is not ".DS_Store":
            file.append(open(directory+entry.name).readlines())
    file = list(itertools.permutations(file))
    for b in range(0, len(file)):
        for i in itertools.product(*file[b]):
            test = '\n'.join(i).replace("\n", "")
            erg.stdin.writelines(test+'\n')

print(erg.communicate()[0])

This is my output with communicate:

Session..........: hashcat
Status...........: Cracked
Hash.Type........: SHA-512
Hash.Target......:          7ba4e9da57a7d3bd8b1b43c0b028a96d77721f6b33e3b85f0b2...298b56
Time.Started.....: Sat Feb 24 03:52:05 2018 (0 secs)
Time.Estimated...: Sat Feb 24 03:52:05 2018 (0 secs)
Guess.Base.......: Pipe
Speed.Dev.#2.....:   969.7 kH/s (0.13ms)
Recovered........: 1/1 (100.00%) Digests, 1/1 (100.00%) Salts
Progress.........: 384
Rejected.........: 0
Restore.Point....: 0
Candidates.#2....: telefon1telefon3telefon2 -> tasse2tasse3tasse1

And this is my output with an for loop with an stdout.readline:

Session..........: hashcat
Status...........: Running
Hash.Type........: SHA-512
Hash.Target......:  7ba4e9da57a7d3bd8b1b43c0b028a96d77721f6b33e3b85f0b2...298b56
Time.Started.....: Sat Feb 24 04:14:30 2018 (10 secs)
Time.Estimated...: Sat Feb 24 04:14:40 2018 (0 secs)
Guess.Base.......: Pipe
Speed.Dev.#2.....:        0 H/s (0.00ms)
Recovered........: 0/1 (0.00%) Digests, 0/1 (0.00%) Salts
Progress.........: 0
Rejected.........: 0
Restore.Point....: 0
Candidates.#2....: [Copying]

As you can see, I get an output, but the hashcat process doesn't get my stdin stream or doesn't process it and I don't know why.

How can I realize an continuous output with my code?

Upvotes: 0

Views: 1329

Answers (1)

friluk
friluk

Reputation: 1

The answer from JohanL in the comments was my solution. Great thanks for that.

You should consider using threads and have stdout and stdin run in separate threads, as e.g. in my answer here: [link of post][stackoverflow.com/a/48777349/7738328 – JohanL]

Upvotes: 0

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