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nearby/internal/platform/implementation/linux/ble_v2_medium.cc
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// 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.
#include <algorithm>
#include <array>
#include <cassert>
#include <cerrno>
#include <cstring>
#include <bluetooth/bluetooth.h>
#include <bluetooth/l2cap.h>
#include <sys/socket.h>
#include <unistd.h>
#include <sdbus-c++/IProxy.h>
#include <sdbus-c++/Types.h>
#include "absl/synchronization/mutex.h"
#include "internal/platform/implementation/ble.h"
// #include "internal/platform/implementation/linux/ble_gatt_client.h"
// #include "internal/platform/implementation/linux/ble_gatt_server.h"
#include "internal/platform/implementation/linux/ble_v2_medium.h"
#include "connections/implementation/flags/nearby_connections_feature_flags.h"
#include "absl/types/span.h"
#include "absl/time/time.h"
#include "ble_gatt_client.h"
#include "ble_gatt_server.h"
#include "ble_l2cap_server_socket.h"
#include "ble_l2cap_socket.h"
#include "internal/base/observer_list.h"
#include "internal/platform/implementation/linux/bluetooth_classic_device.h"
#include "internal/platform/implementation/linux/bluetooth_devices.h"
#include "internal/platform/implementation/linux/bluez.h"
#include "internal/platform/implementation/linux/bluez_advertisement_monitor.h"
#include "internal/platform/implementation/linux/bluez_advertisement_monitor_manager.h"
#include "internal/platform/implementation/linux/bluez_le_advertisement.h"
#include "internal/platform/implementation/linux/dbus.h"
#include "internal/platform/implementation/linux/generated/dbus/bluez/advertisement_monitor_server.h"
#include "internal/platform/implementation/linux/generated/dbus/bluez/le_advertisement_manager_client.h"
#include "internal/platform/mac_address.h"
#include "internal/platform/prng.h"
#include "internal/flags/nearby_flags.h"
namespace nearby {
namespace linux {
namespace {
using nearby::connections::config_package_nearby::nearby_connections_feature::kRefactorBleL2cap;
BleL2capSocket::ProtocolMode GetL2capProtocolMode() {
const bool refactor_enabled = NearbyFlags::GetInstance().GetBoolFlag(kRefactorBleL2cap);
return refactor_enabled ? BleL2capSocket::ProtocolMode::kRefactored
: BleL2capSocket::ProtocolMode::kLegacy;
}
} // namespace
BleV2Medium::BleV2Medium(BluetoothAdapter &adapter)
: system_bus_(adapter.GetConnection()),
adapter_(adapter),
gatt_discovery_(std::make_shared<BluezGattDiscovery>(system_bus_)),
observers_(std::make_shared<ObserverList<api::BluetoothClassicMedium::Observer>>()),
devices_(std::make_unique<BluetoothDevices>(
system_bus_, adapter_.GetObjectPath(), *observers_)),
root_object_manager_(std::make_unique<RootObjectManager>(*system_bus_, "/com/google/nearby/medium/ble/advertisement/monitor")),
adv_monitor_manager_(
bluez::AdvertisementMonitorManager::
DiscoverAdvertisementMonitorManager(*system_bus_, adapter_)),
adv_manager_(std::make_unique<bluez::LEAdvertisementManager>(*system_bus_,
adapter)),
cur_adv_(nullptr) {
// generating psm value for l2cap socket
Prng prng;
psm_ = 0x80 + (prng.NextUint32() % 0x80);
if (adv_monitor_manager_) {
LOG(INFO)
<< __func__
<< ": Registering path /com/google/nearby/medium/ble/advertisement/monitor with AdvertisementMonitorManager at "
<< adv_monitor_manager_->getObjectPath();
try {
adv_monitor_manager_->RegisterMonitor(root_object_manager_->getObjectPath());
} catch (const sdbus::Error &e) {
DBUS_LOG_METHOD_CALL_ERROR(adv_monitor_manager_, "RegisterMonitor", e);
}
}
// if (gatt_discovery_->InitializeKnownServices()) {
// LOG(ERROR) << __func__
// << ": Could not initialize known GATT services";
// }
}
// sync api
// called twice. Once with extended regular advertisement ( when IsExtendedAdvertisementsAvailable() == true )
// and another for GATT-backed header advertisement for legacy devices
bool BleV2Medium::StartAdvertising(
const api::ble::BleAdvertisementData &advertising_data,
api::ble::AdvertiseParameters advertise_set_parameters) {
if (!advertising_data.is_extended_advertisement)
{
// can't send two LE advertisements at the same
return true;
}
if (!adapter_.IsEnabled()) {
LOG(WARNING) << "BLE cannot start advertising because the "
"bluetooth adapter is not enabled.";
return false;
}
if (advertising_data.service_data.empty()) {
LOG(WARNING)
<< "BLE cannot start to advertise due to invalid service data.";
return false;
}
absl::MutexLock l (&advs_mutex_);
advs_.push_front(bluez::LEAdvertisement::CreateLEAdvertisement(
*system_bus_, advertising_data, advertise_set_parameters));
auto it = advs_.begin();
LOG(INFO) << __func__ << ": Registering advertisement, is_extended: " << advertising_data.is_extended_advertisement
<< " " << (*it) -> getObjectPath() << " on bluetooth adapter "
<< adapter_.GetObjectPath();
try {
adv_manager_->RegisterAdvertisement((*it)->getObjectPath(), {});
} catch (const sdbus::Error &e) {
advs_.erase(it);
DBUS_LOG_METHOD_CALL_ERROR(adv_manager_, "RegisterAdvertisement", e);
return false;
}
return true;
}
//async api
// runs with nearby presence
std::unique_ptr<api::ble::BleMedium::AdvertisingSession>
BleV2Medium::StartAdvertising(
const api::ble::BleAdvertisementData &advertising_data,
api::ble::AdvertiseParameters advertise_set_parameters,
AdvertisingCallback callback) {
if (!adapter_.IsEnabled()) {
LOG(WARNING) << ": BLE cannot start advertising because the "
"bluetooth adapter is not enabled.";
return nullptr;
}
if (advertising_data.service_data.empty()) {
LOG(WARNING)
<< ": BLE cannot start to advertise due to invalid service data.";
return nullptr;
}
std::shared_ptr<AdvertisingCallback> shared_cb =
std::make_shared<AdvertisingCallback>(std::move(callback));
absl::MutexLock lock(&advs_mutex_);
advs_.push_front(bluez::LEAdvertisement::CreateLEAdvertisement(
*system_bus_, advertising_data, advertise_set_parameters));
auto adv_it = advs_.begin();
// Keep async API surface, but register using the same typed DBus path as the
// working sync implementation to avoid signature mismatch (oa{sv} vs sa{sv}).
try {
adv_manager_->RegisterAdvertisement((*adv_it)->getObjectPath(), {});
shared_cb->start_advertising_result(absl::OkStatus());
} catch (const sdbus::Error &e) {
advs_.erase(adv_it);
DBUS_LOG_METHOD_CALL_ERROR(adv_manager_, "RegisterAdvertisement", e);
auto name = e.getName();
std::string msg = e.getMessage();
absl::Status status;
if (name == "org.bluez.Error.InvalidArguments" ||
name == "org.bluez.Error.InvalidLength") {
status = absl::InvalidArgumentError(msg);
} else if (name == "org.bluez.Error.AlreadyExists") {
status = absl::AlreadyExistsError(msg);
} else if (name == "org.bluez.Error.NotPermitted") {
status = absl::ResourceExhaustedError(msg);
} else {
status = absl::UnknownError(msg);
}
shared_cb->start_advertising_result(std::move(status));
return nullptr;
}
absl::AnyInvocable<absl::Status()> stop_adv = [&, adv_it]() {
LOG(INFO) << __func__ << ": Unregistering advertisement object "
<< (*adv_it)->getObjectPath();
absl::MutexLock lock(&advs_mutex_);
try {
adv_manager_->UnregisterAdvertisement((*adv_it)->getObjectPath());
} catch (const sdbus::Error &e) {
DBUS_LOG_METHOD_CALL_ERROR(adv_manager_, "UnregisterAdvertisement", e);
return absl::UnknownError(e.getMessage());
}
advs_.erase(adv_it);
return absl::OkStatus();
};
return std::make_unique<api::ble::BleMedium::AdvertisingSession>(
api::ble::BleMedium::AdvertisingSession{std::move(stop_adv)});
}
bool BleV2Medium::StopAdvertising() {
absl::MutexLock l(&advs_mutex_);
try {
for (auto& adv: advs_)
{
adv_manager_->UnregisterAdvertisement(adv->getObjectPath());
}
} catch (const sdbus::Error &e) {
DBUS_LOG_METHOD_CALL_ERROR(adv_manager_, "UnregisterAdvertisement", e);
return false;
}
advs_.clear();
return true;
}
bool BleV2Medium::StartScanning(const Uuid &service_uuid,
api::ble::TxPowerLevel tx_power_level,
ScanCallback callback) {
if (cur_monitored_service_uuid_.has_value()) {
LOG(ERROR) << __func__
<< ": A sync scanning session is already active for "
<< std::string{*cur_monitored_service_uuid_};
return false;
}
if (adv_monitor_manager_ == nullptr) {
LOG(WARNING) << __func__
<< ": Advertising monitor not supported by BlueZ";
// TODO: Implement manual monitoring.
return false;
}
if (!MonitorManagerSupportsOr()) {
LOG(WARNING)
<< __func__
<< ": \"or_patterns\" not supported by AdvertisementMonitorManager";
// TODO: Implement manual monitoring.
return false;
}
absl::MutexLock lock(&active_adv_monitors_mutex_);
if (active_adv_monitors_.count(service_uuid) == 1) {
LOG(ERROR) << __func__ << ": an advertising session for service "
<< std::string{service_uuid} << " already exists";
return false;
}
auto monitor = std::make_unique<bluez::AdvertisementMonitor>(
*system_bus_, service_uuid, tx_power_level, "or_patterns", devices_,
std::move(callback));
try {
// why is this emitted?
monitor->emitInterfacesAddedSignal(
{org::bluez::AdvertisementMonitor1_adaptor::INTERFACE_NAME});
// adv_monitor_manager_ -> RegisterMonitor(monitor -> getObjectPath());
LOG(INFO)<< __func__ << ": Registered advertisement monitor with path " << monitor -> getObjectPath();
} catch (const sdbus::Error &e) {
LOG(ERROR)
<< __func__
<< ": error emitting InterfacesAdded signal for object path "
<< monitor->getObjectPath() << " with name '" << e.getName()
<< "' and message '" << e.getMessage() << "'";
return false;
}
auto device_watcher = std::make_unique<DeviceWatcher>(
*system_bus_, adapter_.GetObjectPath(), adapter_, devices_);
if (!StartLEDiscovery()) {
LOG(ERROR) << __func__
<< ": Could not start LE discovery on adapter "
<< adapter_.GetObjectPath();
device_watcher = nullptr;
try {
monitor->emitInterfacesRemovedSignal(
{org::bluez::AdvertisementMonitor1_adaptor::INTERFACE_NAME});
} catch (const sdbus::Error &e) {
LOG(ERROR)
<< __func__
<< ": error emitting InterfacesRemoved signal for object path "
<< monitor->getObjectPath() << " with name '" << e.getName()
<< "' and message '" << e.getMessage() << "'";
}
return false;
}
LOG(INFO) << __func__ << " :Started monitoring for service UUID: " << std::string(service_uuid);
active_adv_monitors_[service_uuid] =
std::make_pair(std::move(monitor), std::move(device_watcher));
cur_monitored_service_uuid_ = service_uuid;
return true;
}
bool BleV2Medium::StopScanning() {
if (!cur_monitored_service_uuid_.has_value()) {
LOG(ERROR) << __func__
<< ": No sync scanning session is currently active.";
return false;
}
if (adv_monitor_manager_ == nullptr) {
// TODO: Implement manual monitoring.
return false;
}
auto &adapter = adapter_.GetBluezAdapterObject();
LOG(INFO) << __func__ << ": Stopping discovery for adapter "
<< adapter.getObjectPath();
try {
adapter.StopDiscovery(); // this will stop bluetooth classic discovery as well. do we want this?
} catch (const sdbus::Error &e) {
DBUS_LOG_METHOD_CALL_ERROR(&adapter, "StopDiscovery", e);
}
absl::MutexLock lock(&active_adv_monitors_mutex_);
auto monitor_it = active_adv_monitors_.find(*cur_monitored_service_uuid_);
assert(monitor_it != active_adv_monitors_.end());
{
auto &[_uuid, session] = *monitor_it;
auto &[adv_monitor, _watcher] = session;
LOG(INFO) << __func__ << ": Removing advertising monitor "
<< adv_monitor->getObjectPath();
adv_monitor->emitInterfacesRemovedSignal(
{org::bluez::AdvertisementMonitor1_adaptor::INTERFACE_NAME});
}
active_adv_monitors_.erase(monitor_it);
cur_monitored_service_uuid_ = std::nullopt;
return true;
}
std::unique_ptr<api::ble::BleMedium::ScanningSession>
BleV2Medium::StartScanning(const Uuid &service_uuid,
api::ble::TxPowerLevel tx_power_level,
ScanningCallback callback) {
if (adv_monitor_manager_ == nullptr) {
// TODO: Implement manual monitoring.
return nullptr;
}
absl::MutexLock lock(&active_adv_monitors_mutex_);
if (active_adv_monitors_.count(service_uuid) == 1) {
LOG(ERROR) << __func__ << ": Service " << std::string{service_uuid}
<< " is already being advertised";
return nullptr;
}
auto monitor = std::make_unique<bluez::AdvertisementMonitor>(
*system_bus_, service_uuid, tx_power_level, "or_patterns", devices_,
std::move(callback));
try {
monitor->emitInterfacesAddedSignal(
{org::bluez::AdvertisementMonitor1_adaptor::INTERFACE_NAME});
} catch (const sdbus::Error &e) {
LOG(ERROR)
<< __func__
<< ": error emitting InterfacesAdded signal for object path "
<< monitor->getObjectPath() << " with name '" << e.getName()
<< "' and message '" << e.getMessage() << "'";
return nullptr;
}
auto device_watcher = std::make_unique<DeviceWatcher>(
*system_bus_, adapter_.GetObjectPath(),adapter_, devices_);
if (!StartLEDiscovery()) {
LOG(ERROR) << __func__
<< ": Could not start LE discovery on adapter "
<< adapter_.GetObjectPath();
try {
monitor->emitInterfacesRemovedSignal(
{org::bluez::AdvertisementMonitor1_adaptor::INTERFACE_NAME});
} catch (const sdbus::Error &e) {
LOG(ERROR)
<< __func__
<< ": error emitting InterfacesRemoved signal for object path "
<< monitor->getObjectPath() << " with name '" << e.getName()
<< "' and message '" << e.getMessage() << "'";
}
return nullptr;
}
active_adv_monitors_[service_uuid] =
std::make_pair(std::move(monitor), std::move(device_watcher));
return std::make_unique<ScanningSession>(
ScanningSession{.stop_scanning = [this, service_uuid]() {
absl::MutexLock lock(&active_adv_monitors_mutex_);
if (active_adv_monitors_.count(service_uuid) == 0) {
LOG(ERROR)
<< __func__ << ": Advertising monitor for service "
<< std::string{service_uuid} << " does not exist anymore";
return absl::NotFoundError(
"Advertising monitor for this service does not exist");
}
auto &[monitor, watcher] = active_adv_monitors_[service_uuid];
try {
monitor->emitInterfacesRemovedSignal(
{org::bluez::AdvertisementMonitor1_adaptor::INTERFACE_NAME});
} catch (const sdbus::Error &e) {
LOG(ERROR)
<< __func__
<< ": error emitting InterfacesRemoved signal for object path "
<< monitor->getObjectPath() << " with name '" << e.getName()
<< "' and message '" << e.getMessage() << "'";
}
auto &adapter = adapter_.GetBluezAdapterObject();
absl::Status status;
try {
adapter.StopDiscovery();
status = absl::OkStatus();
} catch (const sdbus::Error &e) {
DBUS_LOG_METHOD_CALL_ERROR(&adapter, "StopDiscovery", e);
status = absl::InternalError(e.getMessage());
}
active_adv_monitors_.erase(service_uuid);
return status;
}});
}
std::unique_ptr<api::ble::GattServer> BleV2Medium::StartGattServer(
api::ble::ServerGattConnectionCallback callback) {
// (void)callback;
// return nullptr;
return std::make_unique<GattServer>(
*system_bus_, adapter_, devices_,std::move(callback)
);
}
std::unique_ptr<api::ble::GattClient> BleV2Medium::ConnectToGattServer(
api::ble::BlePeripheral::UniqueId peripheral_id,
api::ble::TxPowerLevel tx_power_level,
api::ble::ClientGattConnectionCallback callback) {
(void)peripheral_id;
(void)tx_power_level;
(void)callback;
LOG(WARNING) << __func__
<< ": GATT client connection is not supported on Linux yet.";
return nullptr;
}
std::unique_ptr<api::ble::BleServerSocket> BleV2Medium::OpenServerSocket(
const std::string &service_id) {
LOG(INFO) << __func__ << ": Opening BLE server socket for service "
<< service_id;
return std::make_unique<BleV2ServerSocket>(service_id);
}
std::unique_ptr<api::ble::BleL2capServerSocket>
BleV2Medium::OpenL2capServerSocket(const std::string &service_id) {
// return nullptr;
LOG(INFO) << __func__ << ": Opening L2CAP server socket for service "
<< service_id;
auto server_socket = std::make_unique<linux::BleL2capServerSocket>(
psm_, GetL2capProtocolMode(), service_id);
return server_socket;
}
// This is supposed to be for a socket on top of Weave protocol.
std::unique_ptr<api::ble::BleSocket> BleV2Medium::Connect(
const std::string &service_id, api::ble::TxPowerLevel tx_power_level,
api::ble::BlePeripheral::UniqueId peripheral_id,
CancellationFlag *cancellation_flag) {
LOG(INFO) << __func__ << ": Not implemented on linux ";
return nullptr;
}
bool BleV2Medium::IsExtendedAdvertisementsAvailable() {
try {
auto supported_channels = adv_manager_->SupportedSecondaryChannels();
return !supported_channels.empty();
} catch (const sdbus::Error &e) {
DBUS_LOG_PROPERTY_GET_ERROR(adv_manager_, "SupportedSecondaryChannels", e);
return false;
}
}
bool BleV2Medium::StartLEDiscovery() {
std::map<std::string, sdbus::Variant> filter;
filter["Transport"] = "auto";
filter["DuplicateData"] = true;
auto &adapter = adapter_.GetBluezAdapterObject();
try {
adapter.SetDiscoveryFilter(filter);
} catch (const sdbus::Error &e) {
DBUS_LOG_METHOD_CALL_ERROR(&adapter, "SetDiscoveryFilter", e);
return false;
}
try {
LOG(INFO) << __func__ << ": Starting LE discovery on "
<< adapter.getObjectPath();
adapter.StartDiscovery();
} catch (const sdbus::Error &e) {
if (e.getName() != "org.bluez.Error.InProgress") {
DBUS_LOG_METHOD_CALL_ERROR(&adapter, "StartDiscovery", e);
return false;
}
}
return true;
}
// std::unique_ptr<api::ble::BleSocket> BleV2Medium::Connect(
// const std::string &service_id, api::ble::TxPowerLevel tx_power_level,
// api::ble::BlePeripheral &peripheral,
// CancellationFlag *cancellation_flag) {
// LOG(WARNING) << __func__ << ": BLE socket connections not implemented on Linux";
// return nullptr;
// }
std::unique_ptr<api::ble::BleL2capSocket> BleV2Medium::ConnectOverL2cap(
int psm, const std::string &service_id,
api::ble::TxPowerLevel tx_power_level,
api::ble::BlePeripheral::UniqueId peripheral_id,
CancellationFlag *cancellation_flag) {
// return nullptr;
auto device = devices_->get_device_by_unique_id(peripheral_id);
if (!device) {
LOG(ERROR) << __func__ << ": Failed to find device with unique ID "
<< peripheral_id;
return nullptr;
}
LOG(INFO) << __func__ << ": Connecting to L2CAP PSM " << psm
<< " on device " << device->GetMacAddress().ToString();
int fd = socket(AF_BLUETOOTH, SOCK_SEQPACKET, BTPROTO_L2CAP);
if (fd < 0) {
LOG(ERROR) << __func__ << ": Failed to create L2CAP socket: "
<< std::strerror(errno);
return nullptr;
}
// Set receive MTU before connect (for LE CoC)
struct sockaddr_l2 addr;
std::memset(&addr, 0, sizeof(addr));
addr.l2_family = AF_BLUETOOTH;
addr.l2_psm = htobs(psm);
if (device -> GetAddressType() == "random") {
addr.l2_bdaddr_type = BDADDR_LE_RANDOM;
}else {
addr.l2_bdaddr_type = BDADDR_LE_PUBLIC;
}
if (bind(fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
LOG(INFO) << "Failed to bind L2CAP socket";
}
struct l2cap_options opts;
opts.omtu = 0;
opts.imtu = 672;
if (setsockopt(fd, SOL_BLUETOOTH, BT_RCVMTU, &opts.imtu, sizeof(opts.imtu)) < 0) {
LOG(WARNING) << __func__ << ": Failed to set BT_RCVMTU: "
<< std::strerror(errno);
}
std::string mac_addr = device->GetMacAddress().ToString();
if (str2ba(mac_addr.c_str(), &addr.l2_bdaddr) < 0) {
LOG(ERROR) << __func__ << ": Invalid Bluetooth address: " << mac_addr;
close(fd);
return nullptr;
}
if (connect(fd, (struct sockaddr*)&addr, sizeof(addr)) < 0) {
LOG(ERROR) << __func__ << ": Failed to connect to L2CAP socket: "
<< std::strerror(errno);
close(fd);
return nullptr;
}
LOG(INFO) << __func__ << ": Successfully connected to L2CAP socket";
auto protocol_mode = GetL2capProtocolMode();
auto socket = std::make_unique<BleL2capSocket>(
fd, peripheral_id, protocol_mode, service_id,
/*incoming_connection=*/false);
if (protocol_mode == BleL2capSocket::ProtocolMode::kLegacy &&
!socket->PerformLegacyOutgoingHandshake(absl::Seconds(5))) {
LOG(ERROR) << __func__ << ": Legacy L2CAP handshake failed.";
socket->Close();
return nullptr;
}
return socket;
}
bool BleV2Medium::StartMultipleServicesScanning(
const std::vector<Uuid> &service_uuids,
api::ble::TxPowerLevel tx_power_level, ScanCallback callback) {
LOG(WARNING) << __func__
<< ": Multiple services scanning not implemented on Linux. "
<< "Use single service scanning instead.";
return false;
}
bool BleV2Medium::PauseMediumScanning() {
LOG(INFO) << __func__ << ": Pause scanning not implemented, returning success";
return true;
}
bool BleV2Medium::ResumeMediumScanning() {
LOG(INFO) << __func__ << ": Resume scanning not implemented, returning success";
return true;
}
void BleV2Medium::AddAlternateUuidForService(uint16_t uuid,
const std::string &service_id) {
LOG(INFO) << __func__ << ": Alternate UUID mapping not implemented. UUID: "
<< uuid << ", service_id: " << service_id;
}
std::optional<api::ble::BlePeripheral::UniqueId>
BleV2Medium::RetrieveBlePeripheralIdFromNativeId(
const std::string &ble_peripheral_native_id) {
LOG(WARNING) << __func__
<< ": Retrieval from native ID not implemented. Native ID: "
<< ble_peripheral_native_id;
return std::nullopt;
}
} // namespace linux
} // namespace nearby
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