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#!/usr/bin/env python
# -*- coding: utf-8 -*-
# DLL dependency resolution and copying script.
# Copyright (C) 2010 John Stumpo
# Copyright (C) 2014 Martin Müllenhaupt
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <https://www.gnu.org/licenses/>.
import os
import shutil
import struct
import sys
def is_pe_file(file):
if not os.path.isfile(file): # Skip directories
return False
f = open(file, 'rb')
if f.read(2) != b'MZ':
return False # DOS magic number not present
f.seek(60)
peoffset = struct.unpack('<L', f.read(4))[0]
f.seek(peoffset)
if f.read(4) != b'PE\0\0':
return False # PE magic number not present
return True
def get_imports(file):
f = open(file, 'rb')
# We already know it's a PE, so don't bother checking again.
f.seek(60)
pe_header_offset = struct.unpack('<L', f.read(4))[0]
# Get sizes of tables we need.
f.seek(pe_header_offset + 6)
number_of_sections = struct.unpack('<H', f.read(2))[0]
f.seek(pe_header_offset + 116)
number_of_data_directory_entries = struct.unpack('<L', f.read(4))[0]
data_directory_offset = f.tell() # it's right after the number of entries
# Where is the import table?
f.seek(data_directory_offset + 8)
rva_of_import_table = struct.unpack('<L', f.read(4))[0]
# Get the section ranges so we can convert RVAs to file offsets.
f.seek(data_directory_offset + 8 * number_of_data_directory_entries)
sections = []
for i in range(number_of_sections):
section_descriptor_data = f.read(40)
name, size, va, rawsize, offset = \
struct.unpack('<8sLLLL', section_descriptor_data[:24])
sections.append({'min': va, 'max': va+rawsize, 'offset': offset})
def seek_to_rva(rva):
for s in sections:
if s['min'] <= rva and rva < s['max']:
f.seek(rva - s['min'] + s['offset'])
return
raise ValueError('Could not find section for RVA.')
# Walk the import table and get RVAs to the null-terminated names of DLLs
# this file uses. The table is terminated by an all-zero entry.
seek_to_rva(rva_of_import_table)
dll_rvas = []
while True:
import_descriptor = f.read(20)
if import_descriptor == b'\0' * 20:
break
dll_rvas.append(struct.unpack('<L', import_descriptor[12:16])[0])
# Read the DLL names from the RVAs we found in the import table.
dll_names = []
for rva in dll_rvas:
seek_to_rva(rva)
name = b''
while True:
c = f.read(1)
if c == b'\0':
break
name += c
dll_names.append(name.decode("ascii"))
return dll_names
if __name__ == "__main__":
import argparse
parser = argparse.ArgumentParser(
description='Recursive copy of DLL dependencies')
parser.add_argument('targetdir',
type=str,
help='target directory where to place the DLLs')
parser.add_argument('-C',
'--checkdir',
type=str,
action='append',
nargs='+',
default=[],
required=True,
help='directories whose dependencies must be ' +
'fulfilled. All PE files will be checked ' +
'(mostly .exe and .dll files)',
dest='checkdirs')
parser.add_argument('-L',
'--libdir',
type=str,
action='append',
nargs='+',
default=[],
required=True,
help='include directories to search for DLL ' +
'dependencies (only .dll files will be used ' +
'from here)',
dest='libdirs')
args = parser.parse_args()
if sys.version_info < (3, 0):
from sets import Set as set
# Map from shortname ('qtcore4.dll') to full path (eg.
# '/.../mxe/i686-w64-mingw32.shared/qt/bin/QtCore4.dll')
available_dlls = dict()
# Remember already copied DLLs (eg 'qtcore4.dll', 'qtgui4.dll')
copied_dlls = set()
# Remember which DLLs must still be checked (eg 'qtnetwork4.dll',
# 'qtgui4.dll')
dlls_to_copy = set()
not_found_dlls = set()
# Create a list of all available .dll files in the libdir directories
# Flattening list: https://stackoverflow.com/questions/952914
for libdir in [item for sublist in args.libdirs for item in sublist]:
for dll_filename in os.listdir(libdir):
dll_filename_full = os.path.join(libdir, dll_filename)
if dll_filename.endswith('.dll') and is_pe_file(dll_filename_full):
available_dlls[dll_filename.lower()] = dll_filename_full
# Create a list of initial dependencies (dlls_to_copy) and already copied
# DLLs (copied_dlls) from the checkdir arguments.
# Flattening list: https://stackoverflow.com/questions/952914
for checkdir in [item for sublist in args.checkdirs for item in sublist]:
for pe_filename in os.listdir(checkdir):
pe_filename_full = os.path.join(checkdir, pe_filename)
if is_pe_file(pe_filename_full):
for dependency_dll in get_imports(pe_filename_full):
dlls_to_copy.add(dependency_dll.lower())
if pe_filename.endswith('.dll'):
copied_dlls.add(pe_filename.lower())
while len(dlls_to_copy):
# We may not change the set during iteration
for dll_to_copy in dlls_to_copy.copy():
if dll_to_copy in copied_dlls:
None
elif dll_to_copy in not_found_dlls:
None
elif dll_to_copy in available_dlls:
shutil.copyfile(available_dlls[dll_to_copy],
os.path.join(args.targetdir,
os.path.basename(available_dlls[dll_to_copy])))
copied_dlls.add(dll_to_copy.lower())
for dependency_dll in get_imports(available_dlls[dll_to_copy]):
dlls_to_copy.add(dependency_dll.lower())
else:
not_found_dlls.add(dll_to_copy)
dlls_to_copy.remove(dll_to_copy)
print("Missing dll files: " + ", ".join(not_found_dlls))
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