mirror of
https://github.com/espressif/openthread.git
synced 2026-08-02 17:17:45 +00:00
Esko DijkandJonathan Hui
48346e3924
This adds a CLI command 'simulation_ble_disconnect' in the TCAT Commissioner, to simulate a sudden BLE link disconnection while the TLS session is still active. Also no Disconnect TLV is sent in this case. This feature is useful for simulation testing of TCAT and for CI testing.
623 lines
21 KiB
Python
623 lines
21 KiB
Python
"""
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Copyright (c) 2024-2026, The OpenThread Authors.
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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3. Neither the name of the copyright holder nor the
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names of its contributors may be used to endorse or promote products
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derived from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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"""
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from abc import abstractmethod
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import asyncio
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from hashlib import sha256
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import hmac
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import logging
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from os import path
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from secrets import token_bytes
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from bleak import BLEDevice
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from ble.ble_connection_constants import BBTC_SERVICE_UUID, BBTC_TX_CHAR_UUID, BBTC_RX_CHAR_UUID
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from ble.ble_stream import BleStream
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from ble.ble_stream_secure import BleStreamSecure
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from ble import ble_scanner
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from ble.udp_stream import UdpStream
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from cli.command import Command, CommandResultNone, CommandResultTLV, CommandResult, CommandResultError
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from dataset.dataset import ThreadDataset
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from tlv.tlv import TLV
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from tlv.diagnostic_tlv import DiagnosticTLVType
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from tlv.tcat_tlv import TcatTLVType
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from utils import select_device_by_user_input
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CHALLENGE_SIZE = 8
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logger = logging.getLogger(__name__)
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class HelpCommand(Command):
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def get_help_string(self) -> str:
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return 'Display help and return.'
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async def execute_default(self, args, context) -> CommandResult:
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commands = context['commands']
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for name, command in commands.items():
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print(f'{name}')
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command.print_help(indent=1)
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return CommandResultNone()
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class DataNotPrepared(Exception):
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pass
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class BleCommand(Command):
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@abstractmethod
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def get_log_string(self) -> str:
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pass
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@abstractmethod
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def prepare_data(self, args, context) -> bytes:
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pass
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async def execute_default(self, args, context) -> CommandResult:
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if context['ble_sstream'] is None or not context['ble_sstream'].is_connected:
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return CommandResultError("TCAT Device not connected.")
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bless: BleStreamSecure = context['ble_sstream']
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print(self.get_log_string())
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try:
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data = self.prepare_data(args, context)
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response = await bless.send_with_resp(data)
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if not response:
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return CommandResultNone()
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tlv_response = TLV.from_bytes(response)
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self.process_response(tlv_response, context)
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return CommandResultTLV(tlv_response)
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except DataNotPrepared as err:
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return CommandResultError(f'Command failed: {err}')
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def process_response(self, tlv_response, context):
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pass
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class HelloCommand(BleCommand):
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def get_log_string(self) -> str:
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return 'Sending hello world...'
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def get_help_string(self) -> str:
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return 'Send round trip "Hello world!" message.'
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def prepare_data(self, args, context) -> bytes:
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return TLV(TcatTLVType.VENDOR_APPLICATION.value, bytes('Hello world!', 'ascii')).to_bytes()
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class GetApplicationLayersCommand(BleCommand):
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def get_log_string(self) -> str:
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return 'Getting application layers....'
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def get_help_string(self) -> str:
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return 'Get supported application layer service names from device.'
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def prepare_data(self, args, context) -> bytes:
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return TLV(TcatTLVType.GET_APPLICATION_LAYERS.value, bytes()).to_bytes()
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def process_response(self, tlv_response, context):
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if tlv_response.type == TcatTLVType.RESPONSE_W_PAYLOAD.value:
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payload = tlv_response.value
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i = 0
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print('Service names:')
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while payload:
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tlv_application = TLV.from_bytes(payload)
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payload = payload[2 + len(tlv_application.value):]
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i += 1
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if (tlv_application.type == TcatTLVType.SERVICE_NAME_UDP.value):
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print(f"\tApplication {i} is UDP service: {tlv_application.value.decode('ascii')}")
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elif (tlv_application.type == TcatTLVType.SERVICE_NAME_TCP.value):
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print(f"\tApplication {i} is TCP service: {tlv_application.value.decode('ascii')}")
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else:
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print('\tUnknown service type.')
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else:
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print('Dataset extraction error.')
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class SendApplicationData1(BleCommand):
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def get_log_string(self) -> str:
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return 'Sending data to application layer 1....'
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def get_help_string(self) -> str:
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return 'Send hex encoded data to application layer 1.'
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def prepare_data(self, args, context) -> bytes:
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payload = bytes.fromhex(args[0])
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return TLV(TcatTLVType.APPLICATION_DATA_1.value, payload).to_bytes()
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class SendApplicationData2(BleCommand):
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def get_log_string(self) -> str:
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return 'Sending data to application layer 2....'
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def get_help_string(self) -> str:
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return 'Send hex encoded data to application layer 2.'
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def prepare_data(self, args, context) -> bytes:
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payload = bytes.fromhex(args[0])
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return TLV(TcatTLVType.APPLICATION_DATA_2.value, payload).to_bytes()
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class SendApplicationData3(BleCommand):
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def get_log_string(self) -> str:
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return 'Sending data to application layer 3....'
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def get_help_string(self) -> str:
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return 'Send hex encoded data to application layer 3.'
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def prepare_data(self, args, context) -> bytes:
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payload = bytes.fromhex(args[0])
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return TLV(TcatTLVType.APPLICATION_DATA_3.value, payload).to_bytes()
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class SendApplicationData4(BleCommand):
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def get_log_string(self) -> str:
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return 'Sending data to application layer 4....'
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def get_help_string(self) -> str:
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return 'Send hex encoded data to application layer 4.'
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def prepare_data(self, args, context) -> bytes:
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payload = bytes.fromhex(args[0])
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return TLV(TcatTLVType.APPLICATION_DATA_4.value, payload).to_bytes()
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class SendVendorData(BleCommand):
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def get_log_string(self) -> str:
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return 'Sending data to vendor specific application layer....'
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def get_help_string(self) -> str:
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return 'Send hex encoded data to vendor specific application layer.'
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def prepare_data(self, args, context) -> bytes:
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payload = bytes.fromhex(args[0])
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return TLV(TcatTLVType.VENDOR_APPLICATION.value, payload).to_bytes()
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class CommissionCommand(BleCommand):
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def get_log_string(self) -> str:
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return 'Commissioning...'
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def get_help_string(self) -> str:
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return 'Update the connected device with current dataset.'
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def prepare_data(self, args, context) -> bytes:
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dataset: ThreadDataset = context['dataset']
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dataset_bytes = dataset.to_bytes()
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return TLV(TcatTLVType.ACTIVE_DATASET.value, dataset_bytes).to_bytes()
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class DecommissionCommand(BleCommand):
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def get_log_string(self) -> str:
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return 'Disabling Thread and decommissioning device...'
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def get_help_string(self) -> str:
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return 'Stop Thread interface and decommission device from current network.'
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def prepare_data(self, args, context) -> bytes:
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return TLV(TcatTLVType.DECOMMISSION.value, bytes()).to_bytes()
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class DisconnectCommand(Command):
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def get_help_string(self) -> str:
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return 'Disconnect client from TCAT device'
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async def execute_default(self, args, context) -> CommandResult:
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await disconnect_helper(context)
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return CommandResultNone()
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class SimulationBleDisconnectCommand(Command):
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def get_help_string(self) -> str:
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return 'Simulate a BLE link break to a simulated TCAT device (no Disconnect TLV, no TLS shutdown).'
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async def execute_default(self, args, context) -> CommandResult:
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ble_stream = context['ble_stream']
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if not isinstance(ble_stream, UdpStream):
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return CommandResultError('only available for a simulation connection (use \'simulation <id>\' first).')
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print('Disconnecting simulated BLE link...')
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# Signal the abrupt link break to the device, then drop local stream state without a TLS
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# shutdown (no close-notify), mirroring a real abrupt disconnect on the client side too.
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await ble_stream.simulation_ble_disconnect()
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await ble_stream.disconnect()
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context['ble_stream'] = None
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context['ble_sstream'] = None
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print('Done')
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return CommandResultNone()
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class ExtractDatasetCommand(BleCommand):
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def get_log_string(self) -> str:
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return 'Getting active dataset.'
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def get_help_string(self) -> str:
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return 'Get active dataset from device.'
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def prepare_data(self, args, context) -> bytes:
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return TLV(TcatTLVType.GET_ACTIVE_DATASET.value, bytes()).to_bytes()
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def process_response(self, tlv_response, context) -> None:
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if tlv_response.type == TcatTLVType.RESPONSE_W_PAYLOAD.value:
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dataset = ThreadDataset()
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dataset.set_from_bytes(tlv_response.value)
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dataset.print_content()
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else:
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print('Dataset extraction error.')
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class GetCommissionerCertificate(BleCommand):
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def get_log_string(self) -> str:
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return 'Getting commissioner certificate.'
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def get_help_string(self) -> str:
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return 'Get last-store TCAT commissioner certificate from TCAT device.'
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def prepare_data(self, args, context) -> bytes:
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return TLV(TcatTLVType.GET_COMMISSIONER_CERTIFICATE.value, bytes()).to_bytes()
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class GetDeviceIdCommand(BleCommand):
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def get_log_string(self) -> str:
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return 'Retrieving device id.'
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def get_help_string(self) -> str:
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return 'Get unique identifier for the TCAT device.'
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def prepare_data(self, args, context) -> bytes:
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return TLV(TcatTLVType.GET_DEVICE_ID.value, bytes()).to_bytes()
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class GetExtPanIDCommand(BleCommand):
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def get_log_string(self) -> str:
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return 'Retrieving extended PAN ID.'
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def get_help_string(self) -> str:
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return 'Get extended PAN ID that is commissioned in the active dataset.'
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def prepare_data(self, args, context) -> bytes:
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return TLV(TcatTLVType.GET_EXT_PAN_ID.value, bytes()).to_bytes()
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class GetProvisioningUrlCommand(BleCommand):
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def get_log_string(self) -> str:
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return 'Retrieving provisioning url.'
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def get_help_string(self) -> str:
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return 'Get a URL for an application suited to commission the TCAT device.'
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def prepare_data(self, args, context) -> bytes:
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return TLV(TcatTLVType.GET_PROVISIONING_URL.value, bytes()).to_bytes()
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class GetNetworkNameCommand(BleCommand):
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def get_log_string(self) -> str:
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return 'Retrieving network name.'
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def get_help_string(self) -> str:
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return 'Get the Thread network name that is commissioned in the active dataset.'
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def prepare_data(self, args, context) -> bytes:
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return TLV(TcatTLVType.GET_NETWORK_NAME.value, bytes()).to_bytes()
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class GetRandomNumberChallenge(BleCommand):
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def get_log_string(self) -> str:
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return 'Retrieving random challenge.'
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def get_help_string(self) -> str:
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return 'Get the device random number challenge.'
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def prepare_data(self, args, context) -> bytes:
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return TLV(TcatTLVType.GET_RANDOM_NUMBER_CHALLENGE.value, bytes()).to_bytes()
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def process_response(self, tlv_response, context) -> None:
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bless: BleStreamSecure = context['ble_sstream']
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if tlv_response.value is not None:
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if len(tlv_response.value) == CHALLENGE_SIZE:
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bless.peer_challenge = tlv_response.value
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else:
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print('Challenge format invalid.')
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class PingCommand(Command):
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def get_help_string(self) -> str:
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return 'Send echo request to TCAT device.'
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async def execute_default(self, args, context) -> CommandResult:
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bless: BleStreamSecure = context['ble_sstream']
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if bless is None or not bless.is_connected:
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return CommandResultError("TCAT Device not connected.")
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payload_size = 10
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max_payload = 512
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if len(args) > 0:
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payload_size = int(args[0])
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if payload_size > max_payload:
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return CommandResultError(f'Payload size too large. Maximum supported value is {max_payload}')
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to_send = token_bytes(payload_size)
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data = TLV(TcatTLVType.PING.value, to_send).to_bytes()
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start_time = asyncio.get_running_loop().time()
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response = await bless.send_with_resp(data)
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elapsed_time = 1e3 * (asyncio.get_running_loop().time() - start_time)
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if not response:
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return CommandResultNone()
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tlv_response = TLV.from_bytes(response)
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if tlv_response.value != to_send:
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print("Error: Ping response payload mismatch.")
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print(f"Roundtrip time: {elapsed_time} ms")
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return CommandResultTLV(tlv_response)
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class PresentHash(BleCommand):
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def get_log_string(self) -> str:
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return 'Presenting hash.'
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def get_help_string(self) -> str:
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return 'Present calculated hash.'
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def prepare_data(self, args, context) -> bytes:
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type = args[0]
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code = None
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tlv_type = None
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if type == "pskd":
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code = bytes(args[1], 'utf-8')
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tlv_type = TcatTLVType.PRESENT_PSKD_HASH.value
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elif type == "pskc":
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code = bytes.fromhex(args[1])
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tlv_type = TcatTLVType.PRESENT_PSKC_HASH.value
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elif type == "install":
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code = bytes(args[1], 'utf-8')
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tlv_type = TcatTLVType.PRESENT_INSTALL_CODE_HASH.value
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else:
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raise DataNotPrepared("Hash code name incorrect.")
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bless: BleStreamSecure = context['ble_sstream']
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if bless.peer_public_key is None:
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raise DataNotPrepared("Peer certificate not present.")
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if bless.peer_challenge is None:
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raise DataNotPrepared("Peer challenge not present.")
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hash = hmac.new(code, digestmod=sha256)
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hash.update(bless.peer_challenge)
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hash.update(bless.peer_public_key)
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data = TLV(tlv_type, hash.digest()).to_bytes()
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return data
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def _handshake_progress_bar(is_concluded: bool):
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if is_concluded:
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print('')
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else:
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print('.', end='', flush=True)
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async def connect_helper(device: BLEDevice | UdpStream,
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context: dict,
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timeout_ble=30.0,
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timeout_simulation=5.0) -> bool:
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"""Helper function for CLI and commands to establish a new secure connection with a TCAT device.
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Handles both BLE and simulated UDP connections. Loads certificates and performs handshake
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to establish a secure channel. Connection objects are stored in the context dictionary.
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Args:
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device: BLEDevice object, or UdpStream (for simulation)
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context: Dictionary containing application context including command line arguments
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timeout_ble: Timeout in seconds for handshake with real TCAT device (default: 30.0)
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timeout_simulation: Timeout in seconds for handshake for simulated TCAT device (default: 5.0)
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Returns:
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True if connection was successful, False otherwise.
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Raises:
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Exception: If certificates cannot be loaded
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"""
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is_simulation = isinstance(device, UdpStream)
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is_debug = logger.getEffectiveLevel() <= logging.DEBUG
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print(f'Connecting to {device}')
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if not is_simulation:
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ble_stream = await BleStream.create(device.address, BBTC_SERVICE_UUID, BBTC_TX_CHAR_UUID, BBTC_RX_CHAR_UUID)
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else:
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ble_stream = device
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ble_sstream = BleStreamSecure(ble_stream)
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context['ble_sstream'] = ble_sstream
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context['ble_stream'] = ble_stream
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cert_path = context['cmd_args'].cert_path if context['cmd_args'] else 'auth'
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ble_sstream.load_cert(
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certfile=path.join(cert_path, 'commissioner_cert.pem'),
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keyfile=path.join(cert_path, 'commissioner_key.pem'),
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cafile=path.join(cert_path, 'ca_cert.pem'),
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)
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logger.info(f"Certificates and key loaded from '{cert_path}'")
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print('Setting up secure channel...')
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ok = False
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try:
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cb = None
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if not is_debug:
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cb = _handshake_progress_bar
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ok = await ble_sstream.do_handshake(progress_callback=cb,
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timeout=timeout_simulation if is_simulation else timeout_ble)
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except Exception as e:
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logger.error(e)
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if ok:
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print('Done')
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return True
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else:
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if ble_stream is not None:
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await ble_stream.disconnect()
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context['ble_stream'] = None
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context['ble_sstream'] = None
|
|
return False
|
|
|
|
|
|
async def disconnect_helper(context: dict) -> None:
|
|
"""Helper function for CLI and commands to disconnect from a TCAT device."""
|
|
bless: BleStreamSecure = context['ble_sstream']
|
|
doing_disconn = False
|
|
if bless is not None and bless.is_connected:
|
|
print('Disconnecting...')
|
|
doing_disconn = True
|
|
logger.debug('Closing TLS connection.')
|
|
await bless.close(timeout=5.0)
|
|
context['ble_sstream'] = None
|
|
|
|
bles = context['ble_stream']
|
|
if bles is not None:
|
|
logger.debug('Closing BLE connection.')
|
|
await bles.disconnect()
|
|
context['ble_stream'] = None
|
|
if doing_disconn:
|
|
print('Done')
|
|
|
|
|
|
class ScanCommand(Command):
|
|
|
|
def get_help_string(self) -> str:
|
|
return 'Perform scan for TCAT devices.'
|
|
|
|
async def execute_default(self, args, context) -> CommandResult:
|
|
if context['ble_sstream'] is not None and context['ble_sstream'].is_connected:
|
|
return CommandResultError('already connected to a TCAT device. Use \'disconnect\' first.')
|
|
|
|
print('Scanning for BLE TCAT devices...')
|
|
tcat_devices = await ble_scanner.scan_tcat_devices()
|
|
device = select_device_by_user_input(tcat_devices)
|
|
if device is not None:
|
|
await connect_helper(device, context)
|
|
|
|
return CommandResultNone()
|
|
|
|
|
|
class SimulationCommand(Command):
|
|
|
|
def get_help_string(self) -> str:
|
|
return 'Connect to a simulated TCAT device over UDP.'
|
|
|
|
async def execute_default(self, args, context) -> CommandResult:
|
|
if len(args) != 1:
|
|
return CommandResultError('need index number of simulated TCAT device as first argument.')
|
|
if context['ble_sstream'] is not None and context['ble_sstream'].is_connected:
|
|
return CommandResultError('already connected to a TCAT device. Use \'disconnect\' first.')
|
|
|
|
device = UdpStream("127.0.0.1", int(args[0]))
|
|
await connect_helper(device, context)
|
|
return CommandResultNone()
|
|
|
|
|
|
class DiagnosticTlvsCommand(BleCommand):
|
|
|
|
def get_log_string(self) -> str:
|
|
return 'Retrieving diagnostic information.'
|
|
|
|
def get_help_string(self) -> str:
|
|
return 'Get diagnostic TLVs from the TCAT device.'
|
|
|
|
def prepare_data(self, args, context) -> bytes:
|
|
num_args = DiagnosticTLVType.names_to_numbers(args)
|
|
try:
|
|
if not num_args:
|
|
raise ValueError()
|
|
vals = [int(x) for x in num_args]
|
|
tlvs = bytes(vals)
|
|
except ValueError:
|
|
print('Please provide a list of diagnostic TLV types as names or numbers')
|
|
print('TLV Types:')
|
|
for key, value in DiagnosticTLVType.get_dict().items():
|
|
print(f'{key} = {value},')
|
|
raise DataNotPrepared()
|
|
|
|
return TLV(TcatTLVType.GET_DIAGNOSTIC_TLVS.value, tlvs).to_bytes()
|
|
|
|
|
|
class ThreadStartCommand(BleCommand):
|
|
|
|
def get_log_string(self) -> str:
|
|
return 'Enabling Thread...'
|
|
|
|
def get_help_string(self) -> str:
|
|
return 'Enable thread interface.'
|
|
|
|
def prepare_data(self, args, context) -> bytes:
|
|
return TLV(TcatTLVType.THREAD_START.value, bytes()).to_bytes()
|
|
|
|
|
|
class ThreadStopCommand(BleCommand):
|
|
|
|
def get_log_string(self) -> str:
|
|
return 'Disabling Thread...'
|
|
|
|
def get_help_string(self) -> str:
|
|
return 'Disable thread interface.'
|
|
|
|
def prepare_data(self, args, context) -> bytes:
|
|
return TLV(TcatTLVType.THREAD_STOP.value, bytes()).to_bytes()
|
|
|
|
|
|
class ThreadStateCommand(Command):
|
|
|
|
def __init__(self):
|
|
super().__init__()
|
|
self._subcommands = {'start': ThreadStartCommand(), 'stop': ThreadStopCommand()}
|
|
|
|
def get_help_string(self) -> str:
|
|
return 'Manipulate state of the Thread interface of the connected device.'
|
|
|
|
async def execute_default(self, args, context) -> CommandResult:
|
|
print('Invalid usage. Provide a subcommand.')
|
|
return CommandResultNone()
|