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83 lines
2.9 KiB
Python
83 lines
2.9 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 logging
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from .hci import HCI_Packet
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from .helpers import PacketTracer
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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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class HCI_Bridge:
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class Forwarder:
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def __init__(self, hci_sink, sender_hci_sink, packet_filter, trace):
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self.hci_sink = hci_sink
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self.sender_hci_sink = sender_hci_sink
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self.packet_filter = packet_filter
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self.trace = trace
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def on_packet(self, packet):
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# Convert the packet bytes to an object
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hci_packet = HCI_Packet.from_bytes(packet)
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# Filter the packet
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if self.packet_filter is not None:
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filtered = self.packet_filter(hci_packet)
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if filtered is not None:
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packet, respond_to_sender = filtered
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hci_packet = HCI_Packet.from_bytes(packet)
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if respond_to_sender:
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self.sender_hci_sink.on_packet(packet)
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return
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# Analyze the packet
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self.trace(hci_packet)
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# Bridge the packet
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self.hci_sink.on_packet(packet)
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def __init__(
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self,
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hci_host_source,
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hci_host_sink,
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hci_controller_source,
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hci_controller_sink,
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host_to_controller_filter=None,
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controller_to_host_filter=None,
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):
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tracer = PacketTracer(emit_message=logger.info)
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host_to_controller_forwarder = HCI_Bridge.Forwarder(
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hci_controller_sink,
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hci_host_sink,
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host_to_controller_filter,
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lambda packet: tracer.trace(packet, 0),
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)
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hci_host_source.set_packet_sink(host_to_controller_forwarder)
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controller_to_host_forwarder = HCI_Bridge.Forwarder(
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hci_host_sink,
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hci_controller_sink,
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controller_to_host_filter,
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lambda packet: tracer.trace(packet, 1),
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)
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hci_controller_source.set_packet_sink(controller_to_host_forwarder)
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