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# Copyright 2023 The Chromium Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""
Parses .apiset section from a DLL (e.g. ApiSetSchema.dll) to determine which
functions are "exported" on a given Windows version by apisets. Only supports
version 6 (Windows 10+) of the schema.
This script is not run automatically as we do not ship a specimen ApiSetSchema
with the build.
vpython3 .\chrome\test\delayload\generate_supported_apisets.py \
--dll c:\Windows\System32\ApisetSchema.dll \
--out-file .\chrome\test\delayload\supported_apisets_10.0.10240.inc
See: https://www.geoffchappell.com/studies/windows/win32/apisetschema/index.htm
"""
import argparse
import hashlib
import os
import sys
import struct
import ctypes
USE_PYTHON_3 = f'This script will only run under python3.'
# Assume this script is under chrome\test\delayload
_SCRIPT_DIR = os.path.dirname(__file__)
_ROOT_DIR = os.path.join(_SCRIPT_DIR, os.pardir, os.pardir, os.pardir)
_PEFILE_DIR = os.path.join(_ROOT_DIR, 'third_party', 'pefile_py3')
sys.path.insert(1, _PEFILE_DIR)
import pefile
def from_utf16(data, start, length):
return data[start:start + length].decode("utf-16-le")
class StructHelper(ctypes.Structure):
def __init__(self, data):
super(StructHelper, self).__init__()
ctypes.memmove(ctypes.addressof(self), data, ctypes.sizeof(self))
class ApiSetNamespaceEntryV6(StructHelper):
_fields_ = [
('Flags', ctypes.c_uint32),
('NameOffset', ctypes.c_uint32),
('NameLength', ctypes.c_uint32),
('HashedLength', ctypes.c_uint32),
('ValueOffset', ctypes.c_uint32),
('ValueCount', ctypes.c_uint32)
]
class ApiSetNamespaceV6(StructHelper):
_fields_ = [
('Version', ctypes.c_uint32),
('Size', ctypes.c_uint32),
('Flags', ctypes.c_uint32),
('Count', ctypes.c_uint32),
('EntryOffset', ctypes.c_uint32),
('HashOffset', ctypes.c_uint32),
('HashFactor', ctypes.c_uint32)
]
class ApiSetSchemaV6:
def __init__(self, data):
self._data = data
self._apisets = []
header = ApiSetNamespaceV6(self._data)
self._flag = header.Flags
self._version = header.Version
self._load_apisets(header.EntryOffset, header.Count)
@property
def apisets(self):
return self._apisets
def _load_apisets(self, offset, count):
for _ in range(count):
entry = ApiSetNamespaceEntryV6(
self._data[offset:offset + ctypes.sizeof(ApiSetNamespaceEntryV6)])
entry_name = from_utf16(self._data, entry.NameOffset, entry.NameLength)
self._apisets.append(entry_name)
offset += ctypes.sizeof(ApiSetNamespaceEntryV6)
def parse_apiset_names(data):
version = struct.unpack("B", data[0:1])[0]
if version != 6:
raise Exception(f'Unsupported schema version: {version}')
apiset_schema = ApiSetSchemaV6(data)
return apiset_schema.apisets
def get_file_version(pe):
for fileinfo in pe.FileInfo[0]:
if fileinfo.Key.decode() == 'StringFileInfo':
for st in fileinfo.StringTable:
for entry in st.entries.items():
if entry[0] == b'FileVersion':
return entry[1].decode('utf8')
raise Exception("FileVersion not found in dll")
def read_apiset_section(filename):
pe = pefile.PE(filename)
product_version = get_file_version(pe)
for section in pe.sections:
if section.Name == b'.apiset\0':
return (product_version, section.get_data())
raise Exception(".apiset section not Found")
# apiset_name: api-ms-win-core-synch-l1-2-0.dll
# -> (api-ms-win-core-synch-l1-2, 0)
def apiset_dll_to_version(apiset_name):
last_dash = apiset_name.rindex('-')
apiset_maj_min = apiset_name[0:last_dash]
apiset_subversion = apiset_name[last_dash+1:]
return (apiset_maj_min, apiset_subversion)
def main():
parser = argparse.ArgumentParser(
description=__doc__, formatter_class=argparse.RawTextHelpFormatter)
parser.add_argument('--dll',
metavar='FILE_NAME',
help='Dll with a .apiset section')
parser.add_argument('--out-file',
default='apisets.inc',
metavar='FILE_NAME',
help='path to write .inc file to')
args, _ = parser.parse_known_args()
shasum = hashlib.sha256(open(args.dll, 'rb').read()).hexdigest()
dll_basename = os.path.basename(args.dll)
(dll_version, data) = read_apiset_section(args.dll)
apiset_names = parse_apiset_names(data)
# Only keep api- entries (skip ext- as these are for kernel modules).
apiset_names = filter(lambda s: s.startswith("api-"), apiset_names)
apiset_entries = [apiset_dll_to_version(s) for s in apiset_names]
with open(args.out_file, 'w', encoding='utf8') as f:
f.write(f'// Generated from {dll_basename}\n')
f.write(f'// FileVersion: {dll_version}\n')
f.write(f'// sha256: {shasum}\n')
f.write(',\n'.join([f'{{"{e[0]}", {e[1]}}}' for e in apiset_entries]))
f.write('\n')
if __name__ == '__main__':
sys.exit(main())
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