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https://github.com/python-kasa/python-kasa.git
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119 lines
3.6 KiB
Python
119 lines
3.6 KiB
Python
import json
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import socket
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import struct
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import logging
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from typing import Any, Dict, Union
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_LOGGER = logging.getLogger(__name__)
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class TPLinkSmartHomeProtocol:
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"""
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Implementation of the TP-Link Smart Home Protocol
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Encryption/Decryption methods based on the works of
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Lubomir Stroetmann and Tobias Esser
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https://www.softscheck.com/en/reverse-engineering-tp-link-hs110/
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https://github.com/softScheck/tplink-smartplug/
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which are licensed under the Apache License, Version 2.0
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http://www.apache.org/licenses/LICENSE-2.0
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"""
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INITIALIZATION_VECTOR = 171
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DEFAULT_PORT = 9999
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DEFAULT_TIMEOUT = 5
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@staticmethod
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def query(host: str,
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request: Union[str, Dict],
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port: int = DEFAULT_PORT) -> Any:
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"""
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Request information from a TP-Link SmartHome Device and return the
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response.
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:param str host: host name or ip address of the device
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:param int port: port on the device (default: 9999)
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:param request: command to send to the device (can be either dict or
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json string)
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:return:
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"""
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if isinstance(request, dict):
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request = json.dumps(request)
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timeout = TPLinkSmartHomeProtocol.DEFAULT_TIMEOUT
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try:
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sock = socket.create_connection((host, port), timeout)
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_LOGGER.debug("> (%i) %s", len(request), request)
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sock.send(TPLinkSmartHomeProtocol.encrypt(request))
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buffer = bytes()
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# Some devices send responses with a length header of 0 and
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# terminate with a zero size chunk. Others send the length and
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# will hang if we attempt to read more data.
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length = -1
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while True:
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chunk = sock.recv(4096)
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if length == -1:
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length = struct.unpack(">I", chunk[0:4])[0]
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buffer += chunk
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if (length > 0 and len(buffer) >= length + 4) or not chunk:
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break
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finally:
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try:
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sock.shutdown(socket.SHUT_RDWR)
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except OSError:
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# OSX raises OSError when shutdown() gets called on a closed
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# socket. We ignore it here as the data has already been read
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# into the buffer at this point.
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pass
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finally:
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sock.close()
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response = TPLinkSmartHomeProtocol.decrypt(buffer[4:])
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_LOGGER.debug("< (%i) %s", len(response), response)
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return json.loads(response)
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@staticmethod
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def encrypt(request: str) -> bytearray:
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"""
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Encrypt a request for a TP-Link Smart Home Device.
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:param request: plaintext request data
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:return: ciphertext request
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"""
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key = TPLinkSmartHomeProtocol.INITIALIZATION_VECTOR
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buffer = bytearray(struct.pack(">I", len(request)))
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for char in request:
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cipher = key ^ ord(char)
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key = cipher
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buffer.append(cipher)
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return buffer
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@staticmethod
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def decrypt(ciphertext: bytes) -> str:
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"""
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Decrypt a response of a TP-Link Smart Home Device.
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:param ciphertext: encrypted response data
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:return: plaintext response
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"""
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key = TPLinkSmartHomeProtocol.INITIALIZATION_VECTOR
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buffer = []
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ciphertext_str = ciphertext.decode('latin-1')
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for char in ciphertext_str:
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plain = key ^ ord(char)
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key = ord(char)
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buffer.append(chr(plain))
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plaintext = ''.join(buffer)
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return plaintext
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