Python disableZlib Examples

Example #1

File: __init__.py Project: SunilMohanAdapa/PySocksipyChain

def DisableSSLCompression():
    # Why? Disabling compression in OpenSSL may reduce memory usage *lots*.

    # If there is a sslzliboff module available, prefer that.
    # See https://github.com/hausen/SSLZlibOff for working code.
    try:
        import sslzliboff
        sslzliboff.disableZlib()
        return
    except:
        pass

    # Otherwise, fall through to the following hack.
    # Source:
    #   http://journal.paul.querna.org/articles/2011/04/05/openssl-memory-use/
    try:
        import ctypes
        import glob
        openssl = ctypes.CDLL(None, ctypes.RTLD_GLOBAL)
        try:
            f = openssl.SSL_COMP_get_compression_methods
        except AttributeError:
            ssllib = sorted(glob.glob("/usr/lib/libssl.so.*"))[0]
            openssl = ctypes.CDLL(ssllib, ctypes.RTLD_GLOBAL)

        openssl.SSL_COMP_get_compression_methods.restype = ctypes.c_void_p
        openssl.sk_zero.argtypes = [ctypes.c_void_p]
        openssl.sk_zero(openssl.SSL_COMP_get_compression_methods())
    except Exception:
        if DEBUG: DEBUG('disableSSLCompression: Failed')

Example #2

File: sockschain.py Project: vinnybod/Empire

def DisableSSLCompression():
    # Why? Disabling compression in OpenSSL may reduce memory usage *lots*.

    # If there is a sslzliboff module available, prefer that.
    # See https://github.com/hausen/SSLZlibOff for working code.
    try:
        import sslzliboff
        sslzliboff.disableZlib()
        return
    except:
        pass

    # Otherwise, fall through to the following hack.
    # Source:
    #   http://journal.paul.querna.org/articles/2011/04/05/openssl-memory-use/
    try:
        import ctypes
        import glob
        openssl = ctypes.CDLL(None, ctypes.RTLD_GLOBAL)
        try:
            f = openssl.SSL_COMP_get_compression_methods
        except AttributeError:
            ssllib = sorted(glob.glob("/usr/lib/libssl.so.*"))[0]
            openssl = ctypes.CDLL(ssllib, ctypes.RTLD_GLOBAL)

        openssl.SSL_COMP_get_compression_methods.restype = ctypes.c_void_p
        openssl.sk_zero.argtypes = [ctypes.c_void_p]
        openssl.sk_zero(openssl.SSL_COMP_get_compression_methods())
    except Exception:
        if DEBUG: DEBUG('disableSSLCompression: Failed')

Example #3

File: test.py Project: hausen/SSLZlibOff

#!/usr/bin/python
# Tests if sslzliboff has been built and installed correctly.

try:
    import sslzliboff
    sslzliboff.disableZlib()
    print("OK. sslzliboff loaded correctly.")
except Exception as e:
    print("ERROR: sslzliboff not loaded. This shouldn't have happened.")