rust/daemon/src/echip/bluetooth.rs

// Copyright 2023 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

use crate::devices::chip::FacadeIdentifier;
use crate::ffi::ffi_bluetooth;
use crate::{devices::device::DeviceIdentifier, echip::EmulatedChip};

use cxx::let_cxx_string;
use netsim_proto::common::ChipKind as ProtoChipKind;
use netsim_proto::config::Bluetooth as BluetoothConfig;
use netsim_proto::configuration::Controller as RootcanalController;
use netsim_proto::model::chip::Bluetooth as ProtoBluetooth;
use netsim_proto::model::Chip as ProtoChip;
use protobuf::{Message, MessageField};

use std::rc::Rc;

/// Parameters for creating Bluetooth chips
pub struct CreateParams {
    device_id: DeviceIdentifier,
    address: String,
    bt_properties: MessageField<RootcanalController>,
}

/// Bluetooth struct will keep track of facade_id
pub struct Bluetooth {
    facade_id: FacadeIdentifier,
}

impl EmulatedChip for Bluetooth {
    fn handle_request(&self, packet: &[u8]) {
        ffi_bluetooth::handle_bt_request(self.facade_id, packet[0], &packet[1..].to_vec())
    }

    fn reset(&self) {
        ffi_bluetooth::bluetooth_reset(self.facade_id);
    }

    fn get(&self) -> ProtoChip {
        let bluetooth_bytes = ffi_bluetooth::bluetooth_get_cxx(self.facade_id);
        let bt_proto = ProtoBluetooth::parse_from_bytes(&bluetooth_bytes).unwrap();
        let mut chip_proto = ProtoChip::new();
        chip_proto.mut_bt().clone_from(&bt_proto);
        chip_proto
    }

    fn patch(&self, chip: ProtoChip) {
        let bluetooth_bytes = chip.bt().write_to_bytes().unwrap();
        ffi_bluetooth::bluetooth_patch_cxx(self.facade_id, &bluetooth_bytes);
    }

    fn get_kind(&self) -> ProtoChipKind {
        ProtoChipKind::BLUETOOTH
    }
}

impl Drop for Bluetooth {
    /// At drop, Remove the emulated chip from the virtual device. No further calls will
    /// be made on this emulated chip. This is called when the packet stream from
    /// the virtual device closes.
    fn drop(&mut self) {
        ffi_bluetooth::bluetooth_remove(self.facade_id);
    }
}

/// Create a new Emulated Bluetooth Chip
pub fn new(create_params: CreateParams) -> Rc<dyn EmulatedChip> {
    let_cxx_string!(cxx_address = create_params.address);
    let proto_bytes =
        create_params.bt_properties.as_ref().unwrap_or_default().write_to_bytes().unwrap();
    let facade_id =
        ffi_bluetooth::bluetooth_add(create_params.device_id, &cxx_address, &proto_bytes);
    let echip = Bluetooth { facade_id };
    Rc::new(echip)
}

/// Starts the Bluetooth service.
pub fn bluetooth_start(
    config: &MessageField<BluetoothConfig>,
    instance_num: u16,
    disable_address_reuse: bool,
) {
    let proto_bytes = config.as_ref().unwrap_or_default().write_to_bytes().unwrap();
    ffi_bluetooth::bluetooth_start(&proto_bytes, instance_num, disable_address_reuse);
}

/// Stops the Bluetooth service.
pub fn bluetooth_stop() {
    ffi_bluetooth::bluetooth_stop();
}