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1#!/usr/bin/env python3
2#
3# Copyright 2015 The Chromium Authors
4# Use of this source code is governed by a BSD-style license that can be
5# found in the LICENSE file.
6"""Generate or update an existing config (.options file) for libfuzzer test.
7
8Invoked by GN from fuzzer_test.gni.
9"""
10
11import argparse
12import os
13import sys
14
15if sys.version_info.major == 2:
16  from ConfigParser import ConfigParser
17else:
18  from configparser import ConfigParser
19
20
21def AddSectionOptions(config, section_name, options):
22  """Add |options| to the |section_name| section of |config|.
23
24  Throws an
25  assertion error if any option in |options| does not have exactly two
26  elements.
27  """
28  if not options:
29    return
30
31  config.add_section(section_name)
32  for option_and_value in options:
33    assert len(option_and_value) == 2, ('%s is not an option, value pair' %
34                                        option_and_value)
35
36    config.set(section_name, *option_and_value)
37
38
39def main():
40  parser = argparse.ArgumentParser(description='Generate fuzzer config.')
41  parser.add_argument('--config', required=True)
42  parser.add_argument('--dict')
43  parser.add_argument('--libfuzzer_options', nargs='+', default=[])
44  parser.add_argument('--centipede_options', nargs='+', default=[])
45  parser.add_argument('--asan_options', nargs='+', default=[])
46  parser.add_argument('--msan_options', nargs='+', default=[])
47  parser.add_argument('--ubsan_options', nargs='+', default=[])
48  parser.add_argument('--grammar_options', nargs='+', default=[])
49  parser.add_argument('--environment_variables',
50                      nargs='+',
51                      default=[],
52                      choices=['AFL_DRIVER_DONT_DEFER=1'])
53  args = parser.parse_args()
54
55  # Script shouldn't be invoked without any arguments, but just in case.
56  if not (args.dict or args.libfuzzer_options or args.environment_variables
57          or args.asan_options or args.msan_options or args.ubsan_options
58          or args.grammar_options):
59    return
60
61  config = ConfigParser()
62  libfuzzer_options = []
63  if args.dict:
64    libfuzzer_options.append(('dict', os.path.basename(args.dict)))
65  libfuzzer_options.extend(
66      option.split('=') for option in args.libfuzzer_options)
67
68  AddSectionOptions(config, 'libfuzzer', libfuzzer_options)
69
70  centipede_options = []
71  if args.dict:
72    centipede_options.append(('dictionary', os.path.basename(args.dict)))
73  centipede_options.extend(
74      option.split('=') for option in args.centipede_options)
75  AddSectionOptions(config, 'centipede', centipede_options)
76
77  AddSectionOptions(config, 'asan',
78                    [option.split('=') for option in args.asan_options])
79
80  AddSectionOptions(config, 'msan',
81                    [option.split('=') for option in args.msan_options])
82
83  AddSectionOptions(config, 'ubsan',
84                    [option.split('=') for option in args.ubsan_options])
85
86  AddSectionOptions(config, 'grammar',
87                    [option.split('=') for option in args.grammar_options])
88
89  AddSectionOptions(
90      config, 'env',
91      [option.split('=') for option in args.environment_variables])
92
93  # Generate .options file.
94  config_path = args.config
95  with open(config_path, 'w') as options_file:
96    options_file.write(
97        '# This is an automatically generated config for ClusterFuzz.\n')
98    config.write(options_file)
99
100
101if __name__ == '__main__':
102  main()
103