tools/ipc_fuzzer/mutate/utils.py

   1 #!/usr/bin/env python
   2 # Copyright 2014 The Chromium Authors. All rights reserved.
   3 # Use of this source code is governed by a BSD-style license that can be
   4 # found in the LICENSE file.
   5
   6 """Utility functions used by Generational and Mutational ClusterFuzz
   7 fuzzers."""
   8
   9 import argparse
  10 import os
  11 import random
  12 import string
  13 import sys
  14 import tempfile
  15
  16 APP_PATH_KEY = 'APP_PATH'
  17 FLAGS_PREFIX = 'flags-'
  18 FUZZ_PREFIX = 'fuzz-'
  19 IPC_REPLAY_APPLICATION = 'ipc_fuzzer_replay'
  20 IPCDUMP_EXTENSION = '.ipcdump'
  21 LAUNCH_PREFIXES = [
  22   '--gpu-launcher',
  23   '--plugin-launcher',
  24   '--ppapi-plugin-launcher',
  25   '--renderer-cmd-prefix',
  26   '--utility-cmd-prefix',
  27 ]
  28
  29 def application_name_for_platform(application_name):
  30   """Return application name for current platform."""
  31   if platform() == 'WINDOWS':
  32     return application_name + '.exe'
  33   return application_name
  34
  35 def create_flags_file(ipcdump_testcase_path, ipc_replay_application_path):
  36   """Create a flags file to add launch prefix to application command line."""
  37   random_launch_prefix = random.choice(LAUNCH_PREFIXES)
  38   file_content = '%s=%s' % (random_launch_prefix, ipc_replay_application_path)
  39
  40   flags_file_path = ipcdump_testcase_path.replace(FUZZ_PREFIX, FLAGS_PREFIX)
  41   file_handle = open(flags_file_path, 'w')
  42   file_handle.write(file_content)
  43   file_handle.close()
  44
  45 def create_temp_file():
  46   """Create a temporary file."""
  47   temp_file = tempfile.NamedTemporaryFile(delete=False)
  48   temp_file.close()
  49   return temp_file.name
  50
  51 def parse_arguments():
  52   """Parse fuzzer arguments."""
  53   parser = argparse.ArgumentParser()
  54   parser.add_argument('--input_dir')
  55   parser.add_argument('--output_dir')
  56   parser.add_argument('--no_of_files', type=int)
  57   args = parser.parse_args();
  58   if (not args.input_dir or
  59       not args.output_dir or
  60       not args.no_of_files):
  61     parser.print_help()
  62     sys.exit(1)
  63
  64   return args
  65
  66 def random_id(size=16, chars=string.ascii_lowercase):
  67   """Return a random id string, default 16 characters long."""
  68   return ''.join(random.choice(chars) for _ in range(size))
  69
  70 def random_ipcdump_testcase_path(ipcdump_directory):
  71   """Return a random ipc testcase path."""
  72   return os.path.join(
  73       ipcdump_directory,
  74       '%s%s%s' % (FUZZ_PREFIX, random_id(), IPCDUMP_EXTENSION))
  75
  76 def platform():
  77   """Return running platform."""
  78   if sys.platform.startswith('win'):
  79     return 'WINDOWS'
  80   if sys.platform.startswith('linux'):
  81     return 'LINUX'
  82   if sys.platform == 'darwin':
  83     return 'MAC'
  84
  85   assert False, 'Unknown platform'
  86
  87 def get_application_path():
  88   """Return chrome application path."""
  89   if APP_PATH_KEY not in os.environ:
  90     sys.exit(
  91         'Environment variable %s should be set to chrome path.' % APP_PATH_KEY)
  92
  93   return os.environ[APP_PATH_KEY]