mirror of
https://github.com/google/bumble.git
synced 2026-04-16 00:25:31 +00:00
1257 lines
50 KiB
Python
1257 lines
50 KiB
Python
# Copyright 2021-2022 Google LLC
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# https://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# -----------------------------------------------------------------------------
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# Imports
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# -----------------------------------------------------------------------------
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import json
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import asyncio
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import logging
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from .hci import *
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from .host import Host
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from .gatt import *
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from .gap import GenericAccessService
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from .core import AdvertisingData, BT_CENTRAL_ROLE, BT_PERIPHERAL_ROLE
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from .utils import AsyncRunner, CompositeEventEmitter, setup_event_forwarding, composite_listener
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from . import gatt_client
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from . import gatt_server
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from . import smp
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from . import sdp
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from . import l2cap
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from . import keys
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# -----------------------------------------------------------------------------
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# Logging
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# -----------------------------------------------------------------------------
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logger = logging.getLogger(__name__)
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# -----------------------------------------------------------------------------
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# Constants
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# -----------------------------------------------------------------------------
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DEVICE_DEFAULT_ADDRESS = '00:00:00:00:00:00'
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DEVICE_DEFAULT_ADVERTISING_INTERVAL = 1000 # ms
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DEVICE_DEFAULT_ADVERTISING_DATA = ''
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DEVICE_DEFAULT_NAME = 'Bumble'
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DEVICE_DEFAULT_INQUIRY_LENGTH = 8 # 10.24 seconds
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DEVICE_DEFAULT_CLASS_OF_DEVICE = 0
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DEVICE_DEFAULT_SCAN_RESPONSE_DATA = b''
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DEVICE_DEFAULT_DATA_LENGTH = (27, 328, 27, 328)
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DEVICE_DEFAULT_SCAN_INTERVAL = 60 # ms
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DEVICE_DEFAULT_SCAN_WINDOW = 60 # ms
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DEVICE_MIN_SCAN_INTERVAL = 25
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DEVICE_MAX_SCAN_INTERVAL = 10240
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DEVICE_MIN_SCAN_WINDOW = 25
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DEVICE_MAX_SCAN_WINDOW = 10240
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# -----------------------------------------------------------------------------
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# Classes
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# -----------------------------------------------------------------------------
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# -----------------------------------------------------------------------------
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class AdvertisementDataAccumulator:
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def __init__(self):
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self.advertising_data = AdvertisingData()
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self.last_advertisement_type = None
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self.connectable = False
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self.flushable = False
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def update(self, data, advertisement_type):
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if advertisement_type == HCI_LE_Advertising_Report_Event.SCAN_RSP:
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if self.last_advertisement_type != HCI_LE_Advertising_Report_Event.SCAN_RSP:
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self.advertising_data.append(data)
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self.flushable = True
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else:
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self.advertising_data = AdvertisingData.from_bytes(data)
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self.flushable = self.last_advertisement_type != HCI_LE_Advertising_Report_Event.SCAN_RSP
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if advertisement_type == HCI_LE_Advertising_Report_Event.ADV_IND or advertisement_type == HCI_LE_Advertising_Report_Event.ADV_DIRECT_IND:
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self.connectable = True
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elif advertisement_type == HCI_LE_Advertising_Report_Event.ADV_SCAN_IND or advertisement_type == HCI_LE_Advertising_Report_Event.ADV_NONCONN_IND:
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self.connectable = False
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self.last_advertisement_type = advertisement_type
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# -----------------------------------------------------------------------------
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class Peer:
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def __init__(self, connection):
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self.connection = connection
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# Create a GATT client for the connection
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self.gatt_client = gatt_client.Client(connection)
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connection.gatt_client = self.gatt_client
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@property
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def services(self):
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return self.gatt_client.services
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async def request_mtu(self, mtu):
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return await self.gatt_client.request_mtu(mtu)
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async def discover_service(self, uuid):
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return await self.gatt_client.discover_service(uuid)
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async def discover_services(self, uuids = []):
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return await self.gatt_client.discover_services(uuids)
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async def discover_included_services(self, service):
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return await self.gatt_client.discover_included_services(service)
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async def discover_characteristics(self, uuids = [], service = None):
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return await self.gatt_client.discover_characteristics(uuids = uuids, service = service)
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async def discover_descriptors(self, characteristic = None, start_handle = None, end_handle = None):
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return await self.gatt_client.discover_descriptors(characteristic, start_handle, end_handle)
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async def discover_attributes(self):
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return await self.gatt_client.discover_attributes()
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async def subscribe(self, characteristic, subscriber=None):
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return await self.gatt_client.subscribe(characteristic, subscriber)
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async def read_value(self, attribute):
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return await self.gatt_client.read_value(attribute)
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async def write_value(self, attribute, value, with_response=False):
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return await self.gatt_client.write_value(attribute, value, with_response)
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async def read_characteristics_by_uuid(self, uuid, service=None):
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return await self.gatt_client.read_characteristics_by_uuid(uuid, service)
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def get_services_by_uuid(self, uuid):
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return self.gatt_client.get_services_by_uuid(uuid)
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def get_characteristics_by_uuid(self, uuid, service = None):
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return self.gatt_client.get_characteristics_by_uuid(uuid, service)
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def __str__(self):
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return f'{self.connection.peer_address} as {self.connection.role_name}'
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# -----------------------------------------------------------------------------
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class Connection(CompositeEventEmitter):
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@composite_listener
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class Listener:
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def on_disconnection(self, reason):
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pass
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def on_connection_parameters_update(self):
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pass
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def on_connection_parameters_update_failure(self, error):
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pass
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def on_connection_phy_update(self):
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pass
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def on_connection_phy_update_failure(self, error):
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pass
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def on_connection_att_mtu_update(self):
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pass
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def on_connection_encryption_change(self):
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pass
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def on_connection_encryption_key_refresh(self):
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pass
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def __init__(self, device, handle, transport, peer_address, peer_resolvable_address, role, parameters):
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super().__init__()
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self.device = device
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self.handle = handle
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self.transport = transport
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self.peer_address = peer_address
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self.peer_resolvable_address = peer_resolvable_address
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self.role = role
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self.parameters = parameters
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self.encryption = 0
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self.authenticated = False
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self.phy = ConnectionPHY(HCI_LE_1M_PHY, HCI_LE_1M_PHY)
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self.att_mtu = ATT_DEFAULT_MTU
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self.data_length = DEVICE_DEFAULT_DATA_LENGTH
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self.gatt_client = None # Per-connection client
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self.gatt_server = device.gatt_server # By default, use the device's shared server
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@property
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def role_name(self):
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return 'CENTRAL' if self.role == BT_CENTRAL_ROLE else 'PERIPHERAL'
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@property
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def is_encrypted(self):
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return self.encryption != 0
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def send_l2cap_pdu(self, cid, pdu):
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self.device.send_l2cap_pdu(self.handle, cid, pdu)
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def create_l2cap_connector(self, psm):
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return self.device.create_l2cap_connector(self, psm)
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async def disconnect(self, reason = HCI_REMOTE_USER_TERMINATED_CONNECTION_ERROR):
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return await self.device.disconnect(self, reason)
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async def pair(self):
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return await self.device.pair(self)
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def request_pairing(self):
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return self.device.request_pairing(self)
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# [Classic only]
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async def authenticate(self):
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return await self.device.authenticate(self)
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async def encrypt(self):
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return await self.device.encrypt(self)
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async def update_parameters(
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self,
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conn_interval_min,
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conn_interval_max,
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conn_latency,
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supervision_timeout
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):
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return await self.device.update_connection_parameters(
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self,
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conn_interval_min,
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conn_interval_max,
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conn_latency,
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supervision_timeout
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)
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def __str__(self):
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return f'Connection(handle=0x{self.handle:04X}, role={self.role_name}, address={self.peer_address})'
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# -----------------------------------------------------------------------------
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class DeviceConfiguration:
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def __init__(self):
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# Setup defaults
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self.name = DEVICE_DEFAULT_NAME
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self.address = DEVICE_DEFAULT_ADDRESS
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self.class_of_device = DEVICE_DEFAULT_CLASS_OF_DEVICE
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self.scan_response_data = DEVICE_DEFAULT_SCAN_RESPONSE_DATA
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self.advertising_interval_min = DEVICE_DEFAULT_ADVERTISING_INTERVAL
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self.advertising_interval_max = DEVICE_DEFAULT_ADVERTISING_INTERVAL
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self.advertising_data = bytes(
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AdvertisingData([(AdvertisingData.COMPLETE_LOCAL_NAME, bytes(self.name, 'utf-8'))])
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)
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self.irk = bytes(16) # This really must be changed for any level of security
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self.keystore = None
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def load_from_file(self, filename):
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with open(filename, 'r') as file:
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config = json.load(file)
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# Load simple properties
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self.name = config.get('name', self.name)
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self.address = Address(config.get('address', self.address))
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self.class_of_device = config.get('class_of_device', self.class_of_device)
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self.advertising_interval_min = config.get('advertising_interval', self.advertising_interval_min)
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self.advertising_interval_max = self.advertising_interval_min
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self.keystore = config.get('keystore')
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# Load or synthesize an IRK
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irk = config.get('irk')
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if irk:
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self.irk = bytes.fromhex(irk)
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else:
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# Construct an IRK from the address bytes
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# NOTE: this is not secure, but will always give the same IRK for the same address
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address_bytes = bytes(self.address)
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self.irk = (address_bytes * 3)[:16]
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# Load advertising data
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advertising_data = config.get('advertising_data')
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if advertising_data:
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self.advertising_data = bytes.fromhex(advertising_data)
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# -----------------------------------------------------------------------------
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# Decorators used with the following Device class
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# (we define them outside of the Device class, because defining decorators
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# within a class requires unnecessarily complicated acrobatics)
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# -----------------------------------------------------------------------------
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# Decorator that converts the first argument from a connection handle to a connection
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def with_connection_from_handle(function):
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@functools.wraps(function)
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def wrapper(self, connection_handle, *args, **kwargs):
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if (connection := self.lookup_connection(connection_handle)) is None:
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logger.warn(f'no connection found for handle 0x{connection_handle:04X}')
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return
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function(self, connection, *args, **kwargs)
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return wrapper
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# Decorator that adds a method to the list of event handlers for host events.
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# This assumes that the method name starts with `on_`
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def host_event_handler(function):
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device_host_event_handlers.append(function.__name__[3:])
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return function
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# List of host event handlers for the Device class.
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# (we define this list outside the class, because referencing a class in method
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# decorators is not straightforward)
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device_host_event_handlers = []
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# -----------------------------------------------------------------------------
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class Device(CompositeEventEmitter):
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@composite_listener
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class Listener:
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def on_advertisement(self, address, data, rssi, advertisement_type):
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pass
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def on_inquiry_result(self, address, class_of_device, data, rssi):
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pass
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def on_connection(self, connection):
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pass
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def on_connection_failure(self, error):
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pass
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def on_characteristic_subscription(self, connection, characteristic, notify_enabled, indicate_enabled):
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pass
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@classmethod
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def with_hci(cls, name, address, hci_source, hci_sink):
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'''
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Create a Device instance with a Host configured to communicate with a controller
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through an HCI source/sink
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'''
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host = Host(controller_source = hci_source, controller_sink = hci_sink)
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return cls(name = name, address = address, host = host)
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@classmethod
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def from_config_file(cls, filename):
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config = DeviceConfiguration()
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config.load_from_file(filename)
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return cls(config=config)
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@classmethod
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def from_config_file_with_hci(cls, filename, hci_source, hci_sink):
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config = DeviceConfiguration()
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config.load_from_file(filename)
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host = Host(controller_source = hci_source, controller_sink = hci_sink)
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return cls(config = config, host = host)
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def __init__(self, name = None, address = None, config = None, host = None, generic_access_service = True):
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super().__init__()
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self._host = None
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self.powered_on = False
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self.advertising = False
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self.auto_restart_advertising = False
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self.command_timeout = 10 # seconds
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self.gatt_server = gatt_server.Server(self)
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self.sdp_server = sdp.Server(self)
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self.l2cap_channel_manager = l2cap.ChannelManager()
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self.advertisement_data = {}
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self.scanning = False
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self.discovering = False
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self.connecting = False
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self.disconnecting = False
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self.connections = {} # Connections, by connection handle
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self.le_enabled = True
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self.classic_enabled = False
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self.discoverable = False
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self.connectable = False
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self.inquiry_response = None
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self.address_resolver = None
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# Use the initial config or a default
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self.public_address = Address('00:00:00:00:00:00')
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if config is None:
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config = DeviceConfiguration()
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self.name = config.name
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self.random_address = config.address
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self.class_of_device = config.class_of_device
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self.scan_response_data = config.scan_response_data
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self.advertising_data = config.advertising_data
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self.advertising_interval_min = config.advertising_interval_min
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self.advertising_interval_max = config.advertising_interval_max
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self.keystore = keys.KeyStore.create_for_device(config)
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self.irk = config.irk
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# If a name is passed, override the name from the config
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if name:
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self.name = name
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# If an address is passed, override the address from the config
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if address:
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if type(address) is str:
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address = Address(address)
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self.random_address = address
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# Setup SMP
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# TODO: allow using a public address
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self.smp_manager = smp.Manager(self, self.random_address)
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# Register the SDP server with the L2CAP Channel Manager
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self.sdp_server.register(self.l2cap_channel_manager)
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# Add a GAP Service if requested
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if generic_access_service:
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self.gatt_server.add_service(GenericAccessService(self.name))
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# Forward some events
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setup_event_forwarding(self.gatt_server, self, 'characteristic_subscription')
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# Set the initial host
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self.host = host
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@property
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def host(self):
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return self._host
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@host.setter
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def host(self, host):
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# Unsubscribe from events from the current host
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if self._host:
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for event_name in device_host_event_handlers:
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self._host.remove_listener(event_name, getattr(self, f'on_{event_name}'))
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# Subscribe to events from the new host
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if host:
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for event_name in device_host_event_handlers:
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host.on(event_name, getattr(self, f'on_{event_name}'))
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# Update the references to the new host
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self._host = host
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self.l2cap_channel_manager.host = host
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# Set providers for the new host
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if host:
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host.long_term_key_provider = self.get_long_term_key
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host.link_key_provider = self.get_link_key
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@property
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def sdp_service_records(self):
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return self.sdp_server.service_records
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@sdp_service_records.setter
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def sdp_service_records(self, service_records):
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self.sdp_server.service_records = service_records
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def lookup_connection(self, connection_handle):
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if connection := self.connections.get(connection_handle):
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return connection
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def register_l2cap_server(self, psm, server):
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self.l2cap_channel_manager.register_server(psm, server)
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def create_l2cap_connector(self, connection, psm):
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return lambda: self.l2cap_channel_manager.connect(connection, psm)
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def create_l2cap_registrar(self, psm):
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return lambda handler: self.register_l2cap_server(psm, handler)
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def send_l2cap_pdu(self, connection_handle, cid, pdu):
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self.host.send_l2cap_pdu(connection_handle, cid, pdu)
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async def send_command(self, command):
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try:
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return await asyncio.wait_for(self.host.send_command(command), self.command_timeout)
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except asyncio.TimeoutError:
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logger.warning('!!! Command timed out')
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async def power_on(self):
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# Reset the controller
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await self.host.reset()
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response = await self.send_command(HCI_Read_BD_ADDR_Command())
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if response.return_parameters.status == HCI_SUCCESS:
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logger.debug(color(f'BD_ADDR: {response.return_parameters.bd_addr}', 'yellow'))
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self.public_address = response.return_parameters.bd_addr
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if self.le_enabled:
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# Set the controller address
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await self.send_command(HCI_LE_Set_Random_Address_Command(
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random_address = self.random_address
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))
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# Load the address resolving list
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if self.keystore:
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await self.send_command(HCI_LE_Clear_Resolving_List_Command())
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resolving_keys = await self.keystore.get_resolving_keys()
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for (irk, address) in resolving_keys:
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await self.send_command(
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HCI_LE_Add_Device_To_Resolving_List_Command(
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peer_identity_address_type = address.address_type,
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peer_identity_address = address,
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peer_irk = irk,
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local_irk = self.irk
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)
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|
)
|
|
|
|
# Enable address resolution
|
|
# await self.send_command(
|
|
# HCI_LE_Set_Address_Resolution_Enable_Command(address_resolution_enable=1)
|
|
# )
|
|
|
|
# Create a host-side address resolver
|
|
self.address_resolver = smp.AddressResolver(resolving_keys)
|
|
|
|
if self.classic_enabled:
|
|
await self.send_command(
|
|
HCI_Write_Local_Name_Command(local_name=self.name.encode('utf8'))
|
|
)
|
|
await self.send_command(
|
|
HCI_Write_Class_Of_Device_Command(class_of_device = self.class_of_device)
|
|
)
|
|
await self.send_command(
|
|
HCI_Write_Simple_Pairing_Mode_Command(simple_pairing_mode = 0x01)
|
|
)
|
|
|
|
# Let the SMP manager know about the address
|
|
# TODO: allow using a public address
|
|
self.smp_manager.address = self.random_address
|
|
|
|
# Done
|
|
self.powered_on = True
|
|
|
|
async def start_advertising(self, auto_restart=False):
|
|
self.auto_restart_advertising = auto_restart
|
|
|
|
# If we're advertising, stop first
|
|
if self.advertising:
|
|
await self.stop_advertising()
|
|
|
|
# Set/update the advertising data
|
|
await self.send_command(HCI_LE_Set_Advertising_Data_Command(
|
|
advertising_data = self.advertising_data
|
|
))
|
|
|
|
# Set/update the scan response data
|
|
await self.send_command(HCI_LE_Set_Scan_Response_Data_Command(
|
|
scan_response_data = self.scan_response_data
|
|
))
|
|
|
|
# Set the advertising parameters
|
|
await self.send_command(HCI_LE_Set_Advertising_Parameters_Command(
|
|
# TODO: use real values, not fixed ones
|
|
advertising_interval_min = self.advertising_interval_min,
|
|
advertising_interval_max = self.advertising_interval_max,
|
|
advertising_type = HCI_LE_Set_Advertising_Parameters_Command.ADV_IND,
|
|
own_address_type = Address.RANDOM_DEVICE_ADDRESS, # TODO: allow using the public address
|
|
peer_address_type = Address.PUBLIC_DEVICE_ADDRESS,
|
|
peer_address = Address('00:00:00:00:00:00'),
|
|
advertising_channel_map = 7,
|
|
advertising_filter_policy = 0
|
|
))
|
|
|
|
# Enable advertising
|
|
await self.send_command(HCI_LE_Set_Advertising_Enable_Command(
|
|
advertising_enable = 1
|
|
))
|
|
|
|
self.advertising = True
|
|
|
|
async def stop_advertising(self):
|
|
# Disable advertising
|
|
if self.advertising:
|
|
await self.send_command(HCI_LE_Set_Advertising_Enable_Command(
|
|
advertising_enable = 0
|
|
))
|
|
|
|
self.advertising = False
|
|
|
|
@property
|
|
def is_advertising(self):
|
|
return self.advertising
|
|
|
|
async def start_scanning(
|
|
self,
|
|
active=True,
|
|
scan_interval=DEVICE_DEFAULT_SCAN_INTERVAL, # Scan interval in ms
|
|
scan_window=DEVICE_DEFAULT_SCAN_WINDOW, # Scan window in ms
|
|
own_address_type=Address.RANDOM_DEVICE_ADDRESS,
|
|
filter_duplicates=False
|
|
):
|
|
# Check that the arguments are legal
|
|
if scan_interval < scan_window:
|
|
raise ValueError('scan_interval must be >= scan_window')
|
|
if scan_interval < DEVICE_MIN_SCAN_INTERVAL or scan_interval > DEVICE_MAX_SCAN_INTERVAL:
|
|
raise ValueError('scan_interval out of range')
|
|
if scan_window < DEVICE_MIN_SCAN_WINDOW or scan_window > DEVICE_MAX_SCAN_WINDOW:
|
|
raise ValueError('scan_interval out of range')
|
|
|
|
# Set the scanning parameters
|
|
scan_type = HCI_LE_Set_Scan_Parameters_Command.ACTIVE_SCANNING if active else HCI_LE_Set_Scan_Parameters_Command.PASSIVE_SCANNING
|
|
await self.send_command(HCI_LE_Set_Scan_Parameters_Command(
|
|
le_scan_type = scan_type,
|
|
le_scan_interval = int(scan_window / 0.625),
|
|
le_scan_window = int(scan_window / 0.625),
|
|
own_address_type = own_address_type,
|
|
scanning_filter_policy = HCI_LE_Set_Scan_Parameters_Command.BASIC_UNFILTERED_POLICY
|
|
))
|
|
|
|
# Enable scanning
|
|
await self.send_command(HCI_LE_Set_Scan_Enable_Command(
|
|
le_scan_enable = 1,
|
|
filter_duplicates = 1 if filter_duplicates else 0
|
|
))
|
|
self.scanning = True
|
|
|
|
async def stop_scanning(self):
|
|
await self.send_command(HCI_LE_Set_Scan_Enable_Command(
|
|
le_scan_enable = 0,
|
|
filter_duplicates = 0
|
|
))
|
|
self.scanning = False
|
|
|
|
@property
|
|
def is_scanning(self):
|
|
return self.scanning
|
|
|
|
@host_event_handler
|
|
def on_advertising_report(self, address, data, rssi, advertisement_type):
|
|
if not (accumulator := self.advertisement_data.get(address)):
|
|
accumulator = AdvertisementDataAccumulator()
|
|
self.advertisement_data[address] = accumulator
|
|
accumulator.update(data, advertisement_type)
|
|
if accumulator.flushable:
|
|
self.emit(
|
|
'advertisement',
|
|
address,
|
|
accumulator.advertising_data,
|
|
rssi,
|
|
accumulator.connectable
|
|
)
|
|
|
|
async def start_discovery(self):
|
|
await self.host.send_command(HCI_Write_Inquiry_Mode_Command(inquiry_mode=HCI_EXTENDED_INQUIRY_MODE))
|
|
|
|
response = await self.send_command(HCI_Inquiry_Command(
|
|
lap = HCI_GENERAL_INQUIRY_LAP,
|
|
inquiry_length = DEVICE_DEFAULT_INQUIRY_LENGTH,
|
|
num_responses = 0 # Unlimited number of responses.
|
|
))
|
|
if response.status != HCI_Command_Status_Event.PENDING:
|
|
self.discovering = False
|
|
raise RuntimeError(f'HCI_Inquiry command failed: {HCI_Constant.status_name(response.status)} ({response.status})')
|
|
|
|
self.discovering = True
|
|
|
|
async def stop_discovery(self):
|
|
await self.send_command(HCI_Inquiry_Cancel_Command())
|
|
self.discovering = False
|
|
|
|
@host_event_handler
|
|
def on_inquiry_result(self, address, class_of_device, data, rssi):
|
|
self.emit(
|
|
'inquiry_result',
|
|
address,
|
|
class_of_device,
|
|
AdvertisingData.from_bytes(data),
|
|
rssi
|
|
)
|
|
|
|
async def set_scan_enable(self, inquiry_scan_enabled, page_scan_enabled):
|
|
if inquiry_scan_enabled and page_scan_enabled:
|
|
scan_enable = 0x03
|
|
elif page_scan_enabled:
|
|
scan_enable = 0x02
|
|
elif inquiry_scan_enabled:
|
|
scan_enable = 0x01
|
|
else:
|
|
scan_enable = 0x00
|
|
|
|
return await self.send_command(HCI_Write_Scan_Enable_Command(scan_enable = scan_enable))
|
|
|
|
async def set_discoverable(self, discoverable=True):
|
|
self.discoverable = discoverable
|
|
if self.classic_enabled:
|
|
# Synthesize an inquiry response if none is set already
|
|
if self.inquiry_response is None:
|
|
self.inquiry_response = bytes(
|
|
AdvertisingData([
|
|
(AdvertisingData.COMPLETE_LOCAL_NAME, bytes(self.name, 'utf-8'))
|
|
])
|
|
)
|
|
|
|
# Update the controller
|
|
await self.host.send_command(
|
|
HCI_Write_Extended_Inquiry_Response_Command(
|
|
fec_required = 0,
|
|
extended_inquiry_response = self.inquiry_response
|
|
)
|
|
)
|
|
await self.set_scan_enable(
|
|
inquiry_scan_enabled = self.discoverable,
|
|
page_scan_enabled = self.connectable
|
|
)
|
|
|
|
async def set_connectable(self, connectable=True):
|
|
self.connectable = connectable
|
|
if self.classic_enabled:
|
|
await self.set_scan_enable(
|
|
inquiry_scan_enabled = self.discoverable,
|
|
page_scan_enabled = self.connectable
|
|
)
|
|
|
|
async def connect(self, peer_address, transport=BT_LE_TRANSPORT):
|
|
'''
|
|
Request a connection to a peer.
|
|
This method cannot be called if there is already a pending connection.
|
|
'''
|
|
|
|
# Adjust the transport automatically if we need to
|
|
if transport == BT_LE_TRANSPORT and not self.le_enabled:
|
|
transport = BT_BR_EDR_TRANSPORT
|
|
elif transport == BT_BR_EDR_TRANSPORT and not self.classic_enabled:
|
|
transport = BT_LE_TRANSPORT
|
|
|
|
# Check that there isn't already a pending connection
|
|
if self.is_connecting:
|
|
raise InvalidStateError('connection already pending')
|
|
|
|
if type(peer_address) is str:
|
|
try:
|
|
peer_address = Address(peer_address)
|
|
except ValueError:
|
|
# If the address is not parssable, assume it is a name instead
|
|
logger.debug('looking for peer by name')
|
|
peer_address = await self.find_peer_by_name(peer_address, transport)
|
|
|
|
# Create a future so that we can wait for the connection's result
|
|
pending_connection = asyncio.get_running_loop().create_future()
|
|
self.on('connection', pending_connection.set_result)
|
|
self.on('connection_failure', pending_connection.set_exception)
|
|
|
|
# Tell the controller to connect
|
|
if transport == BT_LE_TRANSPORT:
|
|
# TODO: use real values, not fixed ones
|
|
result = await self.send_command(HCI_LE_Create_Connection_Command(
|
|
le_scan_interval = 96,
|
|
le_scan_window = 96,
|
|
initiator_filter_policy = 0,
|
|
peer_address_type = peer_address.address_type,
|
|
peer_address = peer_address,
|
|
own_address_type = Address.RANDOM_DEVICE_ADDRESS,
|
|
conn_interval_min = 12,
|
|
conn_interval_max = 24,
|
|
conn_latency = 0,
|
|
supervision_timeout = 72,
|
|
minimum_ce_length = 0,
|
|
maximum_ce_length = 0
|
|
))
|
|
else:
|
|
# TODO: use real values, not fixed ones
|
|
result = await self.send_command(HCI_Create_Connection_Command(
|
|
bd_addr = peer_address,
|
|
packet_type = 0xCC18, # FIXME: change
|
|
page_scan_repetition_mode = HCI_R2_PAGE_SCAN_REPETITION_MODE,
|
|
clock_offset = 0x0000,
|
|
allow_role_switch = 0x01,
|
|
reserved = 0
|
|
))
|
|
|
|
try:
|
|
if result.status != HCI_Command_Status_Event.PENDING:
|
|
raise RuntimeError(f'HCI_LE_Create_Connection_Command failed: {HCI_Constant.status_name(result.status)} ({result.status})')
|
|
|
|
# Wait for the connection process to complete
|
|
self.connecting = True
|
|
return await pending_connection
|
|
finally:
|
|
self.remove_listener('connection', pending_connection.set_result)
|
|
self.remove_listener('connection_failure', pending_connection.set_exception)
|
|
self.connecting = False
|
|
|
|
@property
|
|
def is_connecting(self):
|
|
return self.connecting
|
|
|
|
@property
|
|
def is_disconnecting(self):
|
|
return self.disconnecting
|
|
|
|
async def cancel_connection(self):
|
|
if not self.is_connecting:
|
|
return
|
|
await self.send_command(HCI_LE_Create_Connection_Cancel_Command())
|
|
|
|
async def disconnect(self, connection, reason):
|
|
# Create a future so that we can wait for the disconnection's result
|
|
pending_disconnection = asyncio.get_running_loop().create_future()
|
|
self.on('disconnection', pending_disconnection.set_result)
|
|
self.on('disconnection_failure', pending_disconnection.set_exception)
|
|
|
|
# Request a disconnection
|
|
result = await self.send_command(HCI_Disconnect_Command(connection_handle = connection.handle, reason = reason))
|
|
|
|
try:
|
|
if result.status != HCI_Command_Status_Event.PENDING:
|
|
raise RuntimeError(f'HCI_Disconnect_Command failed: {HCI_Constant.status_name(result.status)} ({result.status})')
|
|
|
|
# Wait for the disconnection process to complete
|
|
self.disconnecting = True
|
|
return await pending_disconnection
|
|
finally:
|
|
self.remove_listener('disconnection', pending_disconnection.set_result)
|
|
self.remove_listener('disconnection_failure', pending_disconnection.set_exception)
|
|
self.disconnecting = False
|
|
|
|
async def update_connection_parameters(
|
|
self,
|
|
connection,
|
|
conn_interval_min,
|
|
conn_interval_max,
|
|
conn_latency,
|
|
supervision_timeout,
|
|
minimum_ce_length = 0,
|
|
maximum_ce_length = 0
|
|
):
|
|
'''
|
|
NOTE: the name of the parameters may look odd, but it just follows the names used in the Bluetooth spec.
|
|
'''
|
|
await self.send_command(HCI_LE_Connection_Update_Command(
|
|
connection_handle = connection.handle,
|
|
conn_interval_min = conn_interval_min,
|
|
conn_interval_max = conn_interval_max,
|
|
conn_latency = conn_latency,
|
|
supervision_timeout = supervision_timeout,
|
|
minimum_ce_length = minimum_ce_length,
|
|
maximum_ce_length = maximum_ce_length
|
|
))
|
|
# TODO: check result
|
|
|
|
async def find_peer_by_name(self, name, transport=BT_LE_TRANSPORT):
|
|
"""
|
|
Scan for a peer with a give name and return its address and transport
|
|
"""
|
|
|
|
# Create a future to wait for an address to be found
|
|
peer_address = asyncio.get_running_loop().create_future()
|
|
|
|
# Scan/inquire with event handlers to handle scan/inquiry results
|
|
def on_peer_found(address, ad_data):
|
|
local_name = ad_data.get(AdvertisingData.COMPLETE_LOCAL_NAME)
|
|
if local_name is None:
|
|
local_name = ad_data.get(AdvertisingData.SHORTENED_LOCAL_NAME)
|
|
if local_name is not None:
|
|
if local_name.decode('utf-8') == name:
|
|
peer_address.set_result(address)
|
|
try:
|
|
handler = None
|
|
if transport == BT_LE_TRANSPORT:
|
|
event_name = 'advertisement'
|
|
handler = self.on(
|
|
event_name,
|
|
lambda address, ad_data, rssi, connectable:
|
|
on_peer_found(address, ad_data)
|
|
)
|
|
|
|
was_scanning = self.scanning
|
|
if not self.scanning:
|
|
await self.start_scanning(filter_duplicates=True)
|
|
|
|
elif transport == BT_BR_EDR_TRANSPORT:
|
|
event_name = 'inquiry_result'
|
|
handler = self.on(
|
|
event_name,
|
|
lambda address, class_of_device, eir_data, rssi:
|
|
on_peer_found(address, eir_data)
|
|
)
|
|
|
|
was_discovering = self.discovering
|
|
if not self.discovering:
|
|
await self.start_discovery()
|
|
else:
|
|
return None
|
|
|
|
return await peer_address
|
|
finally:
|
|
if handler is not None:
|
|
self.remove_listener(event_name, handler)
|
|
|
|
if transport == BT_LE_TRANSPORT and not was_scanning:
|
|
await self.stop_scanning()
|
|
elif transport == BT_BR_EDR_TRANSPORT and not was_discovering:
|
|
await self.stop_discovery()
|
|
|
|
@property
|
|
def pairing_config_factory(self):
|
|
return self.smp_manager.pairing_config_factory
|
|
|
|
@pairing_config_factory.setter
|
|
def pairing_config_factory(self, pairing_config_factory):
|
|
self.smp_manager.pairing_config_factory = pairing_config_factory
|
|
|
|
async def pair(self, connection):
|
|
return await self.smp_manager.pair(connection)
|
|
|
|
def request_pairing(self, connection):
|
|
return self.smp_manager.request_pairing(connection)
|
|
|
|
async def get_long_term_key(self, connection_handle, rand, ediv):
|
|
if (connection := self.lookup_connection(connection_handle)) is None:
|
|
return
|
|
|
|
# Start by looking for the key in an SMP session
|
|
ltk = self.smp_manager.get_long_term_key(connection, rand, ediv)
|
|
if ltk is not None:
|
|
return ltk
|
|
|
|
# Then look for the key in the keystore
|
|
if self.keystore is not None:
|
|
keys = await self.keystore.get(str(connection.peer_address))
|
|
if keys is not None:
|
|
logger.debug('found keys in the key store')
|
|
if keys.ltk:
|
|
return keys.ltk.value
|
|
elif connection.role == BT_CENTRAL_ROLE and keys.ltk_central:
|
|
return keys.ltk_central.value
|
|
elif connection.role == BT_PERIPHERAL_ROLE and keys.ltk_peripheral:
|
|
return keys.ltk_peripheral.value
|
|
|
|
async def get_link_key(self, address):
|
|
# Look for the key in the keystore
|
|
if self.keystore is not None:
|
|
keys = await self.keystore.get(str(address))
|
|
if keys is not None:
|
|
logger.debug('found keys in the key store')
|
|
return keys.link_key.value
|
|
|
|
# [Classic only]
|
|
async def authenticate(self, connection):
|
|
# Set up event handlers
|
|
pending_authentication = asyncio.get_running_loop().create_future()
|
|
|
|
def on_authentication_complete():
|
|
pending_authentication.set_result(None)
|
|
|
|
def on_authentication_failure(error):
|
|
pending_authentication.set_exception(error)
|
|
|
|
connection.on('connection_authentication_complete', on_authentication_complete)
|
|
connection.on('connection_authentication_failure', on_authentication_failure)
|
|
|
|
# Request the authentication
|
|
try:
|
|
result = await self.send_command(
|
|
HCI_Authentication_Requested_Command(connection_handle = connection.handle)
|
|
)
|
|
if result.status != HCI_COMMAND_STATUS_PENDING:
|
|
logger.warn(f'HCI_Authentication_Requested_Command failed: {HCI_Constant.error_name(result.status)}')
|
|
raise HCI_Error(result.status)
|
|
|
|
# Wait for the authentication to complete
|
|
await pending_authentication
|
|
finally:
|
|
connection.remove_listener('connection_authentication_complete', on_authentication_complete)
|
|
connection.remove_listener('connection_authentication_failure', on_authentication_failure)
|
|
|
|
async def encrypt(self, connection):
|
|
# Set up event handlers
|
|
pending_encryption = asyncio.get_running_loop().create_future()
|
|
|
|
def on_encryption_change():
|
|
pending_encryption.set_result(None)
|
|
|
|
def on_encryption_failure(error_code):
|
|
pending_encryption.set_exception(HCI_Error(error_code))
|
|
|
|
connection.on('connection_encryption_change', on_encryption_change)
|
|
connection.on('connection_encryption_failure', on_encryption_failure)
|
|
|
|
# Request the encryption
|
|
try:
|
|
if connection.transport == BT_LE_TRANSPORT:
|
|
# Look for a key in the key store
|
|
if self.keystore is None:
|
|
raise RuntimeError('no key store')
|
|
|
|
keys = await self.keystore.get(str(connection.peer_address))
|
|
if keys is None:
|
|
raise RuntimeError('keys not found in key store')
|
|
|
|
if keys.ltk is not None:
|
|
ltk = keys.ltk.value
|
|
rand = bytes(8)
|
|
ediv = 0
|
|
elif keys.ltk_central is not None:
|
|
ltk = keys.ltk_central.value
|
|
rand = keys.ltk_central.rand
|
|
ediv = keys.ltk_central.ediv
|
|
else:
|
|
raise RuntimeError('no LTK found for peer')
|
|
|
|
if connection.role != HCI_CENTRAL_ROLE:
|
|
raise InvalidStateError('only centrals can start encryption')
|
|
|
|
result = await self.send_command(
|
|
HCI_LE_Start_Encryption_Command(
|
|
connection_handle = connection.handle,
|
|
random_number = rand,
|
|
encrypted_diversifier = ediv,
|
|
long_term_key = ltk
|
|
)
|
|
)
|
|
|
|
if result.status != HCI_COMMAND_STATUS_PENDING:
|
|
logger.warn(f'HCI_LE_Start_Encryption_Command failed: {HCI_Constant.error_name(result.status)}')
|
|
raise HCI_Error(result.status)
|
|
else:
|
|
result = await self.send_command(
|
|
HCI_Set_Connection_Encryption_Command(
|
|
connection_handle = connection.handle,
|
|
encryption_enable = 0x01
|
|
)
|
|
)
|
|
|
|
if result.status != HCI_COMMAND_STATUS_PENDING:
|
|
logger.warn(f'HCI_Set_Connection_Encryption_Command failed: {HCI_Constant.error_name(result.status)}')
|
|
raise HCI_Error(result.status)
|
|
|
|
# Wait for the result
|
|
await pending_encryption
|
|
finally:
|
|
connection.remove_listener('connection_encryption_change', on_encryption_change)
|
|
connection.remove_listener('connection_encryption_failure', on_encryption_failure)
|
|
|
|
# [Classic only]
|
|
@host_event_handler
|
|
def on_link_key(self, bd_addr, link_key, key_type):
|
|
# Store the keys in the key store
|
|
if self.keystore:
|
|
pairing_keys = keys.PairingKeys()
|
|
pairing_keys.link_key = keys.PairingKeys.Key(value = link_key)
|
|
|
|
async def store_keys():
|
|
try:
|
|
await self.keystore.update(str(bd_addr), pairing_keys)
|
|
except Exception as error:
|
|
logger.warn(f'!!! error while storing keys: {error}')
|
|
|
|
asyncio.create_task(store_keys())
|
|
|
|
def add_service(self, service):
|
|
self.gatt_server.add_service(service)
|
|
|
|
def add_services(self, services):
|
|
self.gatt_server.add_services(services)
|
|
|
|
async def notify_subscriber(self, connection, attribute, force=False):
|
|
await self.gatt_server.notify_subscriber(connection, attribute, force)
|
|
|
|
async def notify_subscribers(self, attribute, force=False):
|
|
await self.gatt_server.notify_subscribers(attribute, force)
|
|
|
|
async def indicate_subscriber(self, connection, attribute, force=False):
|
|
await self.gatt_server.indicate_subscriber(connection, attribute, force)
|
|
|
|
async def indicate_subscribers(self, attribute):
|
|
await self.gatt_server.indicate_subscribers(attribute)
|
|
|
|
@host_event_handler
|
|
def on_connection(self, connection_handle, transport, peer_address, peer_resolvable_address, role, connection_parameters):
|
|
logger.debug(f'*** Connection: [0x{connection_handle:04X}] {peer_address} as {HCI_Constant.role_name(role)}')
|
|
if connection_handle in self.connections:
|
|
logger.warn('new connection reuses the same handle as a previous connection')
|
|
|
|
# Resolve the peer address if we can
|
|
if self.address_resolver:
|
|
if peer_address.is_resolvable:
|
|
resolved_address = self.address_resolver.resolve(peer_address)
|
|
if resolved_address is not None:
|
|
logger.debug(f'*** Address resolved as {resolved_address}')
|
|
peer_resolvable_address = peer_address
|
|
peer_address = resolved_address
|
|
|
|
# Create a new connection
|
|
connection = Connection(
|
|
self,
|
|
connection_handle,
|
|
transport,
|
|
peer_address,
|
|
peer_resolvable_address,
|
|
role,
|
|
connection_parameters
|
|
)
|
|
self.connections[connection_handle] = connection
|
|
|
|
# We are no longer advertising
|
|
self.advertising = False
|
|
|
|
# Emit an event to notify listeners of the new connection
|
|
self.emit('connection', connection)
|
|
|
|
@host_event_handler
|
|
def on_connection_failure(self, error_code):
|
|
logger.debug(f'*** Connection failed: {error_code}')
|
|
error = ConnectionError(
|
|
error_code,
|
|
'hci',
|
|
HCI_Constant.error_name(error_code)
|
|
)
|
|
self.emit('connection_failure', error)
|
|
|
|
@host_event_handler
|
|
@with_connection_from_handle
|
|
def on_disconnection(self, connection, reason):
|
|
logger.debug(f'*** Disconnection: [0x{connection.handle:04X}] {connection.peer_address} as {connection.role_name}, reason={reason}')
|
|
connection.emit('disconnection', reason)
|
|
|
|
# Remove the connection from the map
|
|
del self.connections[connection.handle]
|
|
|
|
# Cleanup subsystems that maintain per-connection state
|
|
self.gatt_server.on_disconnection(connection)
|
|
|
|
# Restart advertising if auto-restart is enabled
|
|
if self.auto_restart_advertising:
|
|
logger.debug('restarting advertising')
|
|
asyncio.create_task(self.start_advertising(auto_restart=self.auto_restart_advertising))
|
|
|
|
@host_event_handler
|
|
def on_disconnection_failure(self, error_code):
|
|
logger.debug(f'*** Disconnection failed: {error_code}')
|
|
error = ConnectionError(
|
|
error_code,
|
|
'hci',
|
|
HCI_Constant.error_name(error_code)
|
|
)
|
|
self.emit('disconnection_failure', error)
|
|
|
|
@host_event_handler
|
|
@AsyncRunner.run_in_task()
|
|
async def on_inquiry_complete(self):
|
|
if self.discovering:
|
|
# Inquire again
|
|
await self.start_discovery()
|
|
|
|
@host_event_handler
|
|
@with_connection_from_handle
|
|
def on_connection_authentication_complete(self, connection):
|
|
logger.debug(f'*** Connection Authentication Complete: [0x{connection.handle:04X}] {connection.peer_address} as {connection.role_name}')
|
|
connection.authenticated = True
|
|
connection.emit('connection_authentication_complete')
|
|
|
|
@host_event_handler
|
|
@with_connection_from_handle
|
|
def on_connection_authentication_failure(self, connection, error):
|
|
logger.debug(f'*** Connection Authentication Failure: [0x{connection.handle:04X}] {connection.peer_address} as {connection.role_name}, error={error}')
|
|
connection.emit('connection_authentication_failure', error)
|
|
|
|
@host_event_handler
|
|
@with_connection_from_handle
|
|
def on_connection_encryption_change(self, connection, encryption):
|
|
logger.debug(f'*** Connection Encryption Change: [0x{connection.handle:04X}] {connection.peer_address} as {connection.role_name}, encryption={encryption}')
|
|
connection.encryption = encryption
|
|
connection.emit('connection_encryption_change')
|
|
|
|
@host_event_handler
|
|
@with_connection_from_handle
|
|
def on_connection_encryption_failure(self, connection, error):
|
|
logger.debug(f'*** Connection Encryption Failure: [0x{connection.handle:04X}] {connection.peer_address} as {connection.role_name}, error={error}')
|
|
connection.emit('connection_encryption_failure', error)
|
|
|
|
@host_event_handler
|
|
@with_connection_from_handle
|
|
def on_connection_encryption_key_refresh(self, connection):
|
|
logger.debug(f'*** Connection Key Refresh: [0x{connection.handle:04X}] {connection.peer_address} as {connection.role_name}')
|
|
connection.emit('connection_encryption_key_refresh')
|
|
|
|
@host_event_handler
|
|
@with_connection_from_handle
|
|
def on_connection_parameters_update(self, connection, connection_parameters):
|
|
logger.debug(f'*** Connection Parameters Update: [0x{connection.handle:04X}] {connection.peer_address} as {connection.role_name}, {connection_parameters}')
|
|
connection.parameters = connection_parameters
|
|
connection.emit('connection_parameters_update')
|
|
|
|
@host_event_handler
|
|
@with_connection_from_handle
|
|
def on_connection_parameters_update_failure(self, connection, error):
|
|
logger.debug(f'*** Connection Parameters Update Failed: [0x{connection.handle:04X}] {connection.peer_address} as {connection.role_name}, error={error}')
|
|
connection.emit('connection_parameters_update_failure', error)
|
|
|
|
@host_event_handler
|
|
@with_connection_from_handle
|
|
def on_connection_phy_update(self, connection, connection_phy):
|
|
logger.debug(f'*** Connection PHY Update: [0x{connection.handle:04X}] {connection.peer_address} as {connection.role_name}, {connection_phy}')
|
|
connection.phy = connection_phy
|
|
connection.emit('connection_phy_update')
|
|
|
|
@host_event_handler
|
|
@with_connection_from_handle
|
|
def on_connection_phy_update_failure(self, connection, error):
|
|
logger.debug(f'*** Connection PHY Update Failed: [0x{connection.handle:04X}] {connection.peer_address} as {connection.role_name}, error={error}')
|
|
connection.emit('connection_phy_update_failure', error)
|
|
|
|
@host_event_handler
|
|
@with_connection_from_handle
|
|
def on_connection_att_mtu_update(self, connection, att_mtu):
|
|
logger.debug(f'*** Connection ATT MTU Update: [0x{connection.handle:04X}] {connection.peer_address} as {connection.role_name}, {att_mtu}')
|
|
connection.att_mtu = att_mtu
|
|
connection.emit('connection_att_mtu_update')
|
|
|
|
@host_event_handler
|
|
@with_connection_from_handle
|
|
def on_connection_data_length_change(self, connection, max_tx_octets, max_tx_time, max_rx_octets, max_rx_time):
|
|
logger.debug(f'*** Connection Data Length Change: [0x{connection.handle:04X}] {connection.peer_address} as {connection.role_name}')
|
|
connection.data_length = (max_tx_octets, max_tx_time, max_rx_octets, max_rx_time)
|
|
connection.emit('connection_data_length_change')
|
|
|
|
@with_connection_from_handle
|
|
def on_pairing_start(self, connection):
|
|
connection.emit('pairing_start')
|
|
|
|
@with_connection_from_handle
|
|
def on_pairing(self, connection, keys):
|
|
connection.emit('pairing', keys)
|
|
|
|
@with_connection_from_handle
|
|
def on_pairing_failure(self, connection, reason):
|
|
connection.emit('pairing_failure', reason)
|
|
|
|
@host_event_handler
|
|
@with_connection_from_handle
|
|
def on_gatt_pdu(self, connection, pdu):
|
|
# Parse the L2CAP payload into an ATT PDU object
|
|
att_pdu = ATT_PDU.from_bytes(pdu)
|
|
|
|
# Conveniently, even-numbered op codes are client->server and
|
|
# odd-numbered ones are server->client
|
|
if att_pdu.op_code & 1:
|
|
if connection.gatt_client is None:
|
|
logger.warn(color('no GATT client for connection 0x{connection_handle:04X}'))
|
|
return
|
|
connection.gatt_client.on_gatt_pdu(att_pdu)
|
|
else:
|
|
if connection.gatt_server is None:
|
|
logger.warn(color('no GATT server for connection 0x{connection_handle:04X}'))
|
|
return
|
|
connection.gatt_server.on_gatt_pdu(connection, att_pdu)
|
|
|
|
@host_event_handler
|
|
@with_connection_from_handle
|
|
def on_smp_pdu(self, connection, pdu):
|
|
self.smp_manager.on_smp_pdu(connection, pdu)
|
|
|
|
@host_event_handler
|
|
@with_connection_from_handle
|
|
def on_l2cap_pdu(self, connection, cid, pdu):
|
|
self.l2cap_channel_manager.on_pdu(connection, cid, pdu)
|
|
|
|
def __str__(self):
|
|
return f'Device(name="{self.name}", random_address="{self.random_address}"", public_address="{self.public_address}")'
|