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https://github.com/mjg59/python-broadlink.git
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Clean up device.py (#523)
* Clean up device.send_packet() * Clean up device.auth() * Clean up scan()
This commit is contained in:
Felipe Martins Diel
Felipe Martins Diel
parent
82a20dbdda
commit
9af3a3c56c
@ -3,13 +3,13 @@ import socket
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import threading
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import random
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import time
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from datetime import datetime
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from typing import Generator, Tuple, Union
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from cryptography.hazmat.backends import default_backend
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from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
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from .exceptions import check_error, exception
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from .protocol import Datetime
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HelloResponse = Tuple[int, Tuple[str, int], str, str, bool]
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@ -33,42 +33,13 @@ def scan(
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port = 0
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packet = bytearray(0x30)
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timezone = int(time.timezone / -3600)
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if timezone < 0:
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packet[0x08] = 0xFF + timezone - 1
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packet[0x09] = 0xFF
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packet[0x0A] = 0xFF
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packet[0x0B] = 0xFF
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else:
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packet[0x08] = timezone
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packet[0x09] = 0
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packet[0x0A] = 0
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packet[0x0B] = 0
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year = datetime.now().year
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packet[0x0C] = year & 0xFF
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packet[0x0D] = year >> 8
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packet[0x0E] = datetime.now().minute
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packet[0x0F] = datetime.now().hour
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subyear = str(year)[2:]
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packet[0x10] = int(subyear)
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packet[0x11] = datetime.now().isoweekday()
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packet[0x12] = datetime.now().day
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packet[0x13] = datetime.now().month
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address = local_ip_address.split(".")
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packet[0x18] = int(address[3])
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packet[0x19] = int(address[2])
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packet[0x1A] = int(address[1])
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packet[0x1B] = int(address[0])
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packet[0x1C] = port & 0xFF
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packet[0x1D] = port >> 8
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packet[0x08:0x14] = Datetime.pack(Datetime.now())
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packet[0x18:0x1C] = socket.inet_aton(local_ip_address)[::-1]
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packet[0x1C:0x1E] = port.to_bytes(2, "little")
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packet[0x26] = 6
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checksum = sum(packet, 0xBEAF) & 0xFFFF
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packet[0x20] = checksum & 0xFF
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packet[0x21] = checksum >> 8
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packet[0x20:0x22] = checksum.to_bytes(2, "little")
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start_time = time.time()
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discovered = []
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@ -81,18 +52,19 @@ def scan(
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while True:
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try:
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response, host = conn.recvfrom(1024)
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resp, host = conn.recvfrom(1024)
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except socket.timeout:
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break
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devtype = response[0x34] | response[0x35] << 8
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mac = bytes(reversed(response[0x3A:0x40]))
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devtype = resp[0x34] | resp[0x35] << 8
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mac = resp[0x3A:0x40][::-1]
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if (host, mac, devtype) in discovered:
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continue
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discovered.append((host, mac, devtype))
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name = response[0x40:].split(b"\x00")[0].decode("utf-8")
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is_locked = bool(response[-1])
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name = resp[0x40:].split(b"\x00")[0].decode()
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is_locked = bool(resp[-1])
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yield devtype, host, mac, name, is_locked
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finally:
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conn.close()
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@ -123,7 +95,7 @@ class device:
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self.is_locked = is_locked
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self.count = random.randint(0x8000, 0xFFFF)
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self.iv = bytes.fromhex("562e17996d093d28ddb3ba695a2e6f58")
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self.id = bytes(4)
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self.id = 0
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self.type = "Unknown"
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self.lock = threading.Lock()
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@ -170,30 +142,10 @@ class device:
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def auth(self) -> bool:
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"""Authenticate to the device."""
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payload = bytearray(0x50)
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payload[0x04] = 0x31
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payload[0x05] = 0x31
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payload[0x06] = 0x31
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payload[0x07] = 0x31
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payload[0x08] = 0x31
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payload[0x09] = 0x31
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payload[0x0A] = 0x31
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payload[0x0B] = 0x31
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payload[0x0C] = 0x31
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payload[0x0D] = 0x31
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payload[0x0E] = 0x31
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payload[0x0F] = 0x31
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payload[0x10] = 0x31
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payload[0x11] = 0x31
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payload[0x12] = 0x31
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payload[0x04:0x14] = [0x31]*16
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payload[0x1E] = 0x01
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payload[0x2D] = 0x01
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payload[0x30] = ord("T")
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payload[0x31] = ord("e")
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payload[0x32] = ord("s")
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payload[0x33] = ord("t")
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payload[0x34] = ord(" ")
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payload[0x35] = ord(" ")
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payload[0x36] = ord("1")
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payload[0x30:0x37] = "Test 1".encode()
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response = self.send_packet(0x65, payload)
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check_error(response[0x22:0x24])
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@ -203,7 +155,7 @@ class device:
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if len(key) % 16 != 0:
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return False
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self.id = payload[0x03::-1]
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self.id = int.from_bytes(payload[:0x4], "little")
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self.update_aes(key)
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return True
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@ -262,73 +214,47 @@ class device:
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"""Return device type."""
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return self.type
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def send_packet(self, command: int, payload: bytes) -> bytes:
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def send_packet(self, packet_type: int, payload: bytes) -> bytes:
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"""Send a packet to the device."""
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self.count = ((self.count + 1) | 0x8000) & 0xFFFF
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packet = bytearray(0x38)
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packet[0x00] = 0x5A
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packet[0x01] = 0xA5
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packet[0x02] = 0xAA
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packet[0x03] = 0x55
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packet[0x04] = 0x5A
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packet[0x05] = 0xA5
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packet[0x06] = 0xAA
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packet[0x07] = 0x55
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packet[0x24] = self.devtype & 0xFF
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packet[0x25] = self.devtype >> 8
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packet[0x26] = command
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packet[0x28] = self.count & 0xFF
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packet[0x29] = self.count >> 8
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packet[0x2A] = self.mac[5]
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packet[0x2B] = self.mac[4]
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packet[0x2C] = self.mac[3]
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packet[0x2D] = self.mac[2]
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packet[0x2E] = self.mac[1]
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packet[0x2F] = self.mac[0]
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packet[0x30] = self.id[3]
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packet[0x31] = self.id[2]
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packet[0x32] = self.id[1]
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packet[0x33] = self.id[0]
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packet[0x00:0x08] = bytes.fromhex("5aa5aa555aa5aa55")
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packet[0x24:0x26] = self.devtype.to_bytes(2, "little")
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packet[0x26:0x28] = packet_type.to_bytes(2, "little")
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packet[0x28:0x2a] = self.count.to_bytes(2, "little")
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packet[0x2a:0x30] = self.mac[::-1]
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packet[0x30:0x34] = self.id.to_bytes(4, "little")
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p_checksum = sum(payload, 0xBEAF) & 0xFFFF
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packet[0x34:0x36] = p_checksum.to_bytes(2, "little")
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# pad the payload for AES encryption
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padding = (16 - len(payload)) % 16
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if padding:
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payload = bytearray(payload)
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payload += bytearray(padding)
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checksum = sum(payload, 0xBEAF) & 0xFFFF
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packet[0x34] = checksum & 0xFF
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packet[0x35] = checksum >> 8
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payload = self.encrypt(payload)
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for i in range(len(payload)):
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packet.append(payload[i])
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payload = self.encrypt(payload + bytes(padding))
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packet.extend(payload)
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checksum = sum(packet, 0xBEAF) & 0xFFFF
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packet[0x20] = checksum & 0xFF
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packet[0x21] = checksum >> 8
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packet[0x20:0x22] = checksum.to_bytes(2, "little")
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with self.lock:
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with socket.socket(socket.AF_INET, socket.SOCK_DGRAM) as conn:
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timeout = self.timeout
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start_time = time.time()
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with self.lock and socket.socket(socket.AF_INET, socket.SOCK_DGRAM) as conn:
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timeout = self.timeout
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start_time = time.time()
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while True:
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time_left = timeout - (time.time() - start_time)
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conn.settimeout(min(1, time_left))
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conn.sendto(packet, self.host)
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while True:
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time_left = timeout - (time.time() - start_time)
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conn.settimeout(min(1, time_left))
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conn.sendto(packet, self.host)
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try:
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resp = conn.recvfrom(2048)[0]
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break
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except socket.timeout:
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if (time.time() - start_time) > timeout:
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raise exception(-4000) # Network timeout.
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try:
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resp = conn.recvfrom(2048)[0]
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break
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except socket.timeout:
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if (time.time() - start_time) > timeout:
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raise exception(-4000) # Network timeout.
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if len(resp) < 0x30:
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raise exception(-4007) # Length error.
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checksum = resp[0x20] | (resp[0x21] << 8)
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checksum = int.from_bytes(resp[0x20:0x22], "little")
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if sum(resp, 0xBEAF) - sum(resp[0x20:0x22]) & 0xFFFF != checksum:
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raise exception(-4008) # Checksum error.
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49
broadlink/protocol.py
Normal file
49
broadlink/protocol.py
Normal file
@ -0,0 +1,49 @@
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import datetime as dt
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import time
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class Datetime:
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"""Helps to pack and unpack datetime objects for the Broadlink protocol."""
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@staticmethod
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def pack(datetime: dt.datetime) -> bytes:
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"""Pack the timestamp to be sent over the Broadlink protocol."""
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data = bytearray(12)
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utcoffset = int(datetime.utcoffset().total_seconds() / 3600)
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data[:0x04] = utcoffset.to_bytes(4, "little", signed=True)
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data[0x04:0x06] = datetime.year.to_bytes(2, "little")
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data[0x06] = datetime.minute
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data[0x07] = datetime.hour
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data[0x08] = int(datetime.strftime('%y'))
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data[0x09] = datetime.isoweekday()
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data[0x0A] = datetime.day
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data[0x0B] = datetime.month
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return data
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@staticmethod
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def unpack(data: bytes) -> dt.datetime:
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"""Unpack a timestamp received over the Broadlink protocol."""
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utcoffset = int.from_bytes(data[0x00:0x04], "little", signed=True)
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year = int.from_bytes(data[0x04:0x06], "little")
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minute = data[0x06]
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hour = data[0x07]
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subyear = data[0x08]
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isoweekday = data[0x09]
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day = data[0x0A]
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month = data[0x0B]
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tz_info = dt.timezone(dt.timedelta(hours=utcoffset))
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datetime = dt.datetime(year, month, day, hour, minute, 0, 0, tz_info)
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if datetime.isoweekday() != isoweekday:
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raise ValueError("isoweekday does not match")
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if int(datetime.strftime('%y')) != subyear:
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raise ValueError("subyear does not match")
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return datetime
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@staticmethod
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def now() -> dt.datetime:
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"""Return the current date and time with timezone info."""
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tz_info = dt.timezone(dt.timedelta(seconds=-time.timezone))
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return dt.datetime.now(tz_info)
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