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DependencyWalker.py
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DependencyWalker.py
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import sys, os, pefile, ctypes, pprint, shutil, json, time
from PyVutils import File
class DependencyWalker:
# Dependency Walker
g_list_checked_files = set()
def __init__(self, target: str, dirs: list, exts: list, verbose: bool):
# Constructor
self.m_verbose = verbose
self.m_print = pprint.PrettyPrinter(indent=2)
self.m_pe_target = target
if not File.IsFileExists(self.m_pe_target): return
target_dir = File.ExtractFileDirectory(self.m_pe_target)
if not target_dir: target_dir = "."
target_dir = self._normalize_dirs([target_dir])[0]
self.m_dependency_exts = exts
self.m_pe_dependency_dirs = self._normalize_dirs(dirs)
self.m_pe_dependency_files = self.walk_dependency_dirs(self.m_pe_dependency_dirs)
self.m_dependency_file_exists = self.walk_dependency_dir(target_dir)
self.m_pe_dependency_files.update({target_dir: self.m_dependency_file_exists})
self._log(self.m_pe_dependency_files)
self.m_pe_target_dependencies = set()
self.m_prefs = self._load_prefs()
self.m_list_ignore_prefix = self.m_prefs.get("ignore_prefix", [])
# self._log(self.m_list_ignore_prefix)
def _log(self, *args):
# Logging message
if self.m_verbose and len(*args) != 0: self.m_print.pprint(*args)
return
def _normalize_dirs(self, dirs: list):
# Normalize all directories
result = []
for dir in dirs: result.append(File.NormalizePath(dir, True))
return result
def _get_relative_current_dir(self):
# Get relative current directory
result = ""
if getattr(sys, "frozen", False):
result = os.path.dirname(sys.executable)
elif __file__:
result = os.path.dirname(__file__)
return result
def _load_prefs(self):
# Load preferences from a json file
result = {}
prefs_file_path = self._get_relative_current_dir()
prefs_file_path = os.path.join(prefs_file_path, "DW.json")
if not File.IsFileExists(prefs_file_path): return result
try:
data = File.Read(prefs_file_path)
if data: result = json.loads(data)
except Exception as e:
result = {}
self._log("prefs failed", e)
return result
def _is_file_checked(self, file_path: str):
# Determine that a file is checked or not
s = file_path.lower()
if s in DependencyWalker.g_list_checked_files: return True
DependencyWalker.g_list_checked_files.add(s)
# self._log(file_path)
return False
def walk_dependency_dirs(self, dirs: list):
# Walk directories to list dependency files
DependencyWalker.g_list_checked_files.clear()
result = {}
for dir in dirs:
l = self.walk_dependency_dir(dir)
if l: result[dir] = l
return result
def is_dependency_file(self, file_path: str):
# Determine that a file is a dependency file or not
start_time = time.perf_counter()
if self._is_file_checked(file_path):
return False
with open(file_path, "rb") as file:
if file.read(2) != b"MZ": return False
pe = pefile.PE(file_path, fast_load=True)
# IMAGE_DIRECTORY_ENTRY_EXPORT/IMPORT
pe.parse_data_directories([0, 1], True, True) # IMAGE_DIRECTORY_ENTRY_EXPORT/IMPORT
delta_time = time.perf_counter() - start_time
self._log(f"{File.ExtractFileName(file_path)} -> {delta_time:.3f}s")
if not hasattr(pe, "DIRECTORY_ENTRY_EXPORT"): return False
return True
def walk_dependency_dir(self, dir: str):
# Walk a single directory to list dependency files
result = []
len_dir = len(dir)
assert len_dir != 0
def fn_callback(file_path, file_dir, file_name):
if self.is_dependency_file(file_path): result.append(os.path.split(file_path))
return
File.LSRecursive(dir, fn_callback, self.m_dependency_exts)
return result
def _walk_dependency_file(self, file_path: str):
# Walk a single file
start_time = time.perf_counter()
if not File.IsFileExists(file_path): return []
if self._is_file_checked(file_path): return []
pe = pefile.PE(file_path, fast_load=True)
pe.parse_data_directories([0, 1], True, True) # IMAGE_DIRECTORY_ENTRY_EXPORT/IMPORT
delta_time = time.perf_counter() - start_time
self._log(f"{File.ExtractFileName(file_path)} -> {delta_time:.3f}s")
if not hasattr(pe, "DIRECTORY_ENTRY_IMPORT"): return []
result = set()
for idi in pe.DIRECTORY_ENTRY_IMPORT:
dependency_file_name = idi.dll.decode("utf-8")
if not dependency_file_name.lower().startswith(tuple(self.m_list_ignore_prefix)):
result.add(dependency_file_name)
return result
# return set(map(lambda idi: idi.dll.decode("utf-8"), pe.DIRECTORY_ENTRY_IMPORT))
def _get_nonsys_dependency_files(self, dependency_files: set):
# Get non-system dependency files
result = set()
for dependency_file in dependency_files:
module = None
try: module = ctypes.cdll.LoadLibrary(dependency_file)
except: pass
finally:
if module: del module # ctypes.windll.kernel32.FreeLibrary(module)
else: result.add(dependency_file)
return result
def _get_file_path_by_file_name(self, dependency_file_name: str):
# Get dependency file path by file name
result = ""
for _, files in self.m_pe_dependency_files.items():
for file in files:
file_dir, file_name = file
if dependency_file_name.lower() == file_name.lower():
result = os.path.join(file_dir, file_name)
break
return result
def _walk_recursive_dependency_files(self, dependency_files: set):
# Recursive walking dependency files and their dependencies
result = dependency_files.copy()
for dependency_file in dependency_files:
file_path = self._get_file_path_by_file_name(dependency_file)
dependencies = self._walk_dependency_file(file_path)
dependencies = self._get_nonsys_dependency_files(dependencies)
if dependencies:
dependencies = self._walk_recursive_dependency_files(dependencies)
result.update(dependencies)
else: continue
return result
def _remove_exist_dependency_files(self, dependency_files: set):
# Remove dependencies that exists in the target directory
result = dependency_files.copy()
if self.m_dependency_file_exists:
_, dependency_file_exists = list(zip(*self.m_dependency_file_exists))
result -= set(dependency_file_exists)
return result
def walk(self):
# Walk all dependencies in the target
if not File.IsFileExists(self.m_pe_target): return None
DependencyWalker.g_list_checked_files.clear()
self.m_pe_target_dependencies =\
self._walk_dependency_file(self.m_pe_target)
self._log(self.m_pe_target_dependencies)
self.m_pe_target_dependencies =\
self._get_nonsys_dependency_files(self.m_pe_target_dependencies)
self._log(self.m_pe_target_dependencies)
self.m_pe_target_dependencies =\
self._walk_recursive_dependency_files(self.m_pe_target_dependencies)
self._log(self.m_pe_target_dependencies)
self.m_pe_target_dependencies =\
self._remove_exist_dependency_files(self.m_pe_target_dependencies)
self._log(self.m_pe_target_dependencies)
result = {"resolvable": {}, "unresolvable": {}}
for dependency in self.m_pe_target_dependencies:
file_path = self._get_file_path_by_file_name(dependency)
key = "resolvable" if File.IsFileExists(file_path) else "unresolvable"
result[key].update({dependency: file_path})
return result