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138 lines
4.2 KiB
138 lines
4.2 KiB
#!/usr/bin/env python
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#
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# Copyright 2015 clowwindy
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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from __future__ import absolute_import, division, print_function, \
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with_statement
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import os
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import logging
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def find_library_nt(name):
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# modified from ctypes.util
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# ctypes.util.find_library just returns first result he found
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# but we want to try them all
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# because on Windows, users may have both 32bit and 64bit version installed
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results = []
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for directory in os.environ['PATH'].split(os.pathsep):
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fname = os.path.join(directory, name)
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if os.path.isfile(fname):
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results.append(fname)
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if fname.lower().endswith(".dll"):
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continue
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fname = fname + ".dll"
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if os.path.isfile(fname):
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results.append(fname)
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return results
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def find_library(possible_lib_names, search_symbol, library_name):
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import ctypes.util
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from ctypes import CDLL
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paths = []
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if type(possible_lib_names) not in (list, tuple):
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possible_lib_names = [possible_lib_names]
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lib_names = []
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for lib_name in possible_lib_names:
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lib_names.append(lib_name)
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lib_names.append('lib' + lib_name)
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for name in lib_names:
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if os.name == "nt":
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paths.extend(find_library_nt(name))
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else:
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path = ctypes.util.find_library(name)
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if path:
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paths.append(path)
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if not paths:
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# We may get here when find_library fails because, for example,
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# the user does not have sufficient privileges to access those
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# tools underlying find_library on linux.
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import glob
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for name in lib_names:
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patterns = [
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'/usr/local/lib*/lib%s.*' % name,
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'/usr/lib*/lib%s.*' % name,
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'lib%s.*' % name,
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'%s.dll' % name]
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for pat in patterns:
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files = glob.glob(pat)
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if files:
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paths.extend(files)
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for path in paths:
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try:
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lib = CDLL(path)
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if hasattr(lib, search_symbol):
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logging.info('loading %s from %s', library_name, path)
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return lib
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else:
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logging.warn('can\'t find symbol %s in %s', search_symbol,
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path)
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except Exception:
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pass
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return None
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def run_cipher(cipher, decipher):
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from os import urandom
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import random
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import time
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BLOCK_SIZE = 16384
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rounds = 1 * 1024
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plain = urandom(BLOCK_SIZE * rounds)
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results = []
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pos = 0
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print('test start')
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start = time.time()
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while pos < len(plain):
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l = random.randint(100, 32768)
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c = cipher.update(plain[pos:pos + l])
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results.append(c)
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pos += l
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pos = 0
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c = b''.join(results)
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results = []
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while pos < len(plain):
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l = random.randint(100, 32768)
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results.append(decipher.update(c[pos:pos + l]))
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pos += l
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end = time.time()
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print('speed: %d bytes/s' % (BLOCK_SIZE * rounds / (end - start)))
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assert b''.join(results) == plain
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def test_find_library():
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assert find_library('c', 'strcpy', 'libc') is not None
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assert find_library(['c'], 'strcpy', 'libc') is not None
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assert find_library(('c',), 'strcpy', 'libc') is not None
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assert find_library(('crypto', 'eay32'), 'EVP_CipherUpdate',
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'libcrypto') is not None
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assert find_library('notexist', 'strcpy', 'libnotexist') is None
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assert find_library('c', 'symbol_not_exist', 'c') is None
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assert find_library(('notexist', 'c', 'crypto', 'eay32'),
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'EVP_CipherUpdate', 'libc') is not None
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if __name__ == '__main__':
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test_find_library()
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