#!/usr/bin/python3
# Copyright 2022 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Fuzzer displaying insecure use of subprocess.Popen."""

import os
import sys
import subprocess
import atheris
import pysecsan


def list_files_perhaps(param):
  """Insecure call to Popen."""
  try:
    subprocess.Popen(' '.join(['ls', '-la', param]), shell=True)
    os.system(param)
  except ValueError:
    pass


def test_one_input(data):
  """Fuzzer entrypoint."""
  fdp = atheris.FuzzedDataProvider(data)

  if fdp.ConsumeIntInRange(1, 10) == 5:
    list_files_perhaps('FROMFUZZ')
  else:
    list_files_perhaps(fdp.ConsumeUnicodeNoSurrogates(24))


def main():
  """Set up and start fuzzing."""
  pysecsan.add_hooks()

  atheris.instrument_all()
  atheris.Setup(sys.argv, test_one_input, enable_python_coverage=True)
  atheris.Fuzz()


if __name__ == '__main__':
  main()