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Clean up device.py (#523)

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* Clean up device.send_packet()

* Clean up device.auth()

* Clean up scan()
This commit is contained in:
Felipe Martins Diel 2021-01-25 17:00:46 -03:00 committed by Felipe Martins Diel
parent 82a20dbdda
commit 9af3a3c56c
2 changed files with 91 additions and 116 deletions
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134
broadlink/device.py
View File

@ -3,13 +3,13 @@ import socket
import threading
import random
import time
from datetime import datetime
from typing import Generator, Tuple, Union
from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
from .exceptions import check_error, exception
from .protocol import Datetime
HelloResponse = Tuple[int, Tuple[str, int], str, str, bool]
@ -33,42 +33,13 @@ def scan(
port = 0
packet = bytearray(0x30)
timezone = int(time.timezone / -3600)
if timezone < 0:
packet[0x08] = 0xFF + timezone - 1
packet[0x09] = 0xFF
packet[0x0A] = 0xFF
packet[0x0B] = 0xFF
else:
packet[0x08] = timezone
packet[0x09] = 0
packet[0x0A] = 0
packet[0x0B] = 0
year = datetime.now().year
packet[0x0C] = year & 0xFF
packet[0x0D] = year >> 8
packet[0x0E] = datetime.now().minute
packet[0x0F] = datetime.now().hour
subyear = str(year)[2:]
packet[0x10] = int(subyear)
packet[0x11] = datetime.now().isoweekday()
packet[0x12] = datetime.now().day
packet[0x13] = datetime.now().month
address = local_ip_address.split(".")
packet[0x18] = int(address[3])
packet[0x19] = int(address[2])
packet[0x1A] = int(address[1])
packet[0x1B] = int(address[0])
packet[0x1C] = port & 0xFF
packet[0x1D] = port >> 8
packet[0x08:0x14] = Datetime.pack(Datetime.now())
packet[0x18:0x1C] = socket.inet_aton(local_ip_address)[::-1]
packet[0x1C:0x1E] = port.to_bytes(2, "little")
packet[0x26] = 6
checksum = sum(packet, 0xBEAF) & 0xFFFF
packet[0x20] = checksum & 0xFF
packet[0x21] = checksum >> 8
packet[0x20:0x22] = checksum.to_bytes(2, "little")
start_time = time.time()
discovered = []
@ -81,18 +52,19 @@ def scan(
while True:
try:
response, host = conn.recvfrom(1024)
resp, host = conn.recvfrom(1024)
except socket.timeout:
break
devtype = response[0x34] | response[0x35] << 8
mac = bytes(reversed(response[0x3A:0x40]))
devtype = resp[0x34] | resp[0x35] << 8
mac = resp[0x3A:0x40][::-1]
if (host, mac, devtype) in discovered:
continue
discovered.append((host, mac, devtype))
name = response[0x40:].split(b"\x00")[0].decode("utf-8")
is_locked = bool(response[-1])
name = resp[0x40:].split(b"\x00")[0].decode()
is_locked = bool(resp[-1])
yield devtype, host, mac, name, is_locked
finally:
conn.close()
@ -123,7 +95,7 @@ class device:
self.is_locked = is_locked
self.count = random.randint(0x8000, 0xFFFF)
self.iv = bytes.fromhex("562e17996d093d28ddb3ba695a2e6f58")
self.id = bytes(4)
self.id = 0
self.type = "Unknown"
self.lock = threading.Lock()
@ -170,30 +142,10 @@ class device:
def auth(self) -> bool:
"""Authenticate to the device."""
payload = bytearray(0x50)
payload[0x04] = 0x31
payload[0x05] = 0x31
payload[0x06] = 0x31
payload[0x07] = 0x31
payload[0x08] = 0x31
payload[0x09] = 0x31
payload[0x0A] = 0x31
payload[0x0B] = 0x31
payload[0x0C] = 0x31
payload[0x0D] = 0x31
payload[0x0E] = 0x31
payload[0x0F] = 0x31
payload[0x10] = 0x31
payload[0x11] = 0x31
payload[0x12] = 0x31
payload[0x04:0x14] = [0x31]*16
payload[0x1E] = 0x01
payload[0x2D] = 0x01
payload[0x30] = ord("T")
payload[0x31] = ord("e")
payload[0x32] = ord("s")
payload[0x33] = ord("t")
payload[0x34] = ord(" ")
payload[0x35] = ord(" ")
payload[0x36] = ord("1")
payload[0x30:0x37] = "Test 1".encode()
response = self.send_packet(0x65, payload)
check_error(response[0x22:0x24])
@ -203,7 +155,7 @@ class device:
if len(key) % 16 != 0:
return False
self.id = payload[0x03::-1]
self.id = int.from_bytes(payload[:0x4], "little")
self.update_aes(key)
return True
@ -262,54 +214,28 @@ class device:
"""Return device type."""
return self.type
def send_packet(self, command: int, payload: bytes) -> bytes:
def send_packet(self, packet_type: int, payload: bytes) -> bytes:
"""Send a packet to the device."""
self.count = ((self.count + 1) | 0x8000) & 0xFFFF
packet = bytearray(0x38)
packet[0x00] = 0x5A
packet[0x01] = 0xA5
packet[0x02] = 0xAA
packet[0x03] = 0x55
packet[0x04] = 0x5A
packet[0x05] = 0xA5
packet[0x06] = 0xAA
packet[0x07] = 0x55
packet[0x24] = self.devtype & 0xFF
packet[0x25] = self.devtype >> 8
packet[0x26] = command
packet[0x28] = self.count & 0xFF
packet[0x29] = self.count >> 8
packet[0x2A] = self.mac[5]
packet[0x2B] = self.mac[4]
packet[0x2C] = self.mac[3]
packet[0x2D] = self.mac[2]
packet[0x2E] = self.mac[1]
packet[0x2F] = self.mac[0]
packet[0x30] = self.id[3]
packet[0x31] = self.id[2]
packet[0x32] = self.id[1]
packet[0x33] = self.id[0]
packet[0x00:0x08] = bytes.fromhex("5aa5aa555aa5aa55")
packet[0x24:0x26] = self.devtype.to_bytes(2, "little")
packet[0x26:0x28] = packet_type.to_bytes(2, "little")
packet[0x28:0x2a] = self.count.to_bytes(2, "little")
packet[0x2a:0x30] = self.mac[::-1]
packet[0x30:0x34] = self.id.to_bytes(4, "little")
p_checksum = sum(payload, 0xBEAF) & 0xFFFF
packet[0x34:0x36] = p_checksum.to_bytes(2, "little")
# pad the payload for AES encryption
padding = (16 - len(payload)) % 16
if padding:
payload = bytearray(payload)
payload += bytearray(padding)
checksum = sum(payload, 0xBEAF) & 0xFFFF
packet[0x34] = checksum & 0xFF
packet[0x35] = checksum >> 8
payload = self.encrypt(payload)
for i in range(len(payload)):
packet.append(payload[i])
payload = self.encrypt(payload + bytes(padding))
packet.extend(payload)
checksum = sum(packet, 0xBEAF) & 0xFFFF
packet[0x20] = checksum & 0xFF
packet[0x21] = checksum >> 8
packet[0x20:0x22] = checksum.to_bytes(2, "little")
with self.lock:
with socket.socket(socket.AF_INET, socket.SOCK_DGRAM) as conn:
with self.lock and socket.socket(socket.AF_INET, socket.SOCK_DGRAM) as conn:
timeout = self.timeout
start_time = time.time()
@ -328,7 +254,7 @@ class device:
if len(resp) < 0x30:
raise exception(-4007) # Length error.
checksum = resp[0x20] | (resp[0x21] << 8)
checksum = int.from_bytes(resp[0x20:0x22], "little")
if sum(resp, 0xBEAF) - sum(resp[0x20:0x22]) & 0xFFFF != checksum:
raise exception(-4008) # Checksum error.

49
broadlink/protocol.py Normal file
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@ -0,0 +1,49 @@
import datetime as dt
import time
class Datetime:
"""Helps to pack and unpack datetime objects for the Broadlink protocol."""
@staticmethod
def pack(datetime: dt.datetime) -> bytes:
"""Pack the timestamp to be sent over the Broadlink protocol."""
data = bytearray(12)
utcoffset = int(datetime.utcoffset().total_seconds() / 3600)
data[:0x04] = utcoffset.to_bytes(4, "little", signed=True)
data[0x04:0x06] = datetime.year.to_bytes(2, "little")
data[0x06] = datetime.minute
data[0x07] = datetime.hour
data[0x08] = int(datetime.strftime('%y'))
data[0x09] = datetime.isoweekday()
data[0x0A] = datetime.day
data[0x0B] = datetime.month
return data
@staticmethod
def unpack(data: bytes) -> dt.datetime:
"""Unpack a timestamp received over the Broadlink protocol."""
utcoffset = int.from_bytes(data[0x00:0x04], "little", signed=True)
year = int.from_bytes(data[0x04:0x06], "little")
minute = data[0x06]
hour = data[0x07]
subyear = data[0x08]
isoweekday = data[0x09]
day = data[0x0A]
month = data[0x0B]
tz_info = dt.timezone(dt.timedelta(hours=utcoffset))
datetime = dt.datetime(year, month, day, hour, minute, 0, 0, tz_info)
if datetime.isoweekday() != isoweekday:
raise ValueError("isoweekday does not match")
if int(datetime.strftime('%y')) != subyear:
raise ValueError("subyear does not match")
return datetime
@staticmethod
def now() -> dt.datetime:
"""Return the current date and time with timezone info."""
tz_info = dt.timezone(dt.timedelta(seconds=-time.timezone))
return dt.datetime.now(tz_info)