93 lines
2.3 KiB
Python
93 lines
2.3 KiB
Python
from itertools import product
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from multiprocessing import current_process, Pool
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import signal
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from subprocess import DEVNULL, PIPE, Popen, TimeoutExpired
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chars = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ!"#$%&\'()*+,-./:;<=>?@[\\]^_`{|}~ '
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# Prevent zombie processes
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signal.signal(signal.SIGCHLD, signal.SIG_IGN)
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# Current test case pairs used for testing (local to worker process)
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current_pairs = None
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def set_pairs(pairs):
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global current_pairs
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current_pairs = pairs
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def check_pair(script, instr, outstr):
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process = Popen(
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["/usr/bin/env", "bash", "-c", "--", script],
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stdin=PIPE,
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stdout=PIPE,
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stderr=DEVNULL,
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)
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try:
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stdout, stderr = process.communicate(instr.encode(), timeout=5)
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return process.returncode == 0 and stdout == outstr.encode()
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except TimeoutExpired:
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try:
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process.kill()
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stdout, stderr = process.communicate()
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except ProcessLookupError:
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pass
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return False
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def check_script(script):
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for pair in current_pairs:
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if not check_pair(script, *pair):
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return script, False
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return script, True
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def generate_scripts(max_length):
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for length in range(max_length + 1):
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for letters in product(chars, repeat=length):
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yield "".join(letters)
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def find_script(pairs, max_length):
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candidates = []
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chars_count = len(chars)
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num_tasks = int((chars_count ** (max_length + 1) - 1) / (chars_count - 1))
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done_tasks = 0
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with Pool(processes=8, initializer=set_pairs, initargs=(pairs,)) as pool:
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for script, result in pool.imap_unordered(
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check_script,
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generate_scripts(max_length),
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chunksize=10,
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):
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done_tasks += 1
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if done_tasks % 10000 == 0:
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print(f"Progress: {done_tasks}/{num_tasks}")
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if result:
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print(f"> Found candidate: '{script}'")
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candidates.append(script)
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print("Candidates:", candidates)
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if __name__ == '__main__':
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print("\nSearching for identity")
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find_script((
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("1", "1"),
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("42", "42"),
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("1984", "1984"),
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), max_length=3)
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print("\nSearching for successor")
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find_script((
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("1", "2"),
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("42", "43"),
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("1984", "1985"),
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), max_length=5)
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