+class Socks5Auth(object):
+ AUTH_NONE = 0x00
+ AUTH_GSSAPI = 0x01
+ AUTH_USER_PASS = 0x02
+ AUTH_NO_ACCEPTABLE = 0xFF # For server response
+
+
+class Socks5AddressType(object):
+ ATYP_IPV4 = 0x01
+ ATYP_DOMAINNAME = 0x03
+ ATYP_IPV6 = 0x04
+
+
+class ProxyError(socket.error):
+ ERR_SUCCESS = 0x00
+
+ def __init__(self, code=None, msg=None):
+ if code is not None and msg is None:
+ msg = self.CODES.get(code) or 'unknown error'
+ super(ProxyError, self).__init__(code, msg)
+
+
+class InvalidVersionError(ProxyError):
+ def __init__(self, expected_version, got_version):
+ msg = ('Invalid response version from server. Expected {0:02x} got '
+ '{1:02x}'.format(expected_version, got_version))
+ super(InvalidVersionError, self).__init__(0, msg)