gd/hal/hci_hal_host_rootcanal.cc - platform/system/bt - Git at Google

 /*
  * Copyright 2019 The Android Open Source Project
  *
  * 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
  *
  *      http://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 "hal/hci_hal_host_rootcanal.h"
 #include "hal/hci_hal.h"

 #include <netdb.h>
 #include <sys/socket.h>
 #include <sys/types.h>
 #include <unistd.h>
 #include <chrono>
 #include <csignal>
 #include <mutex>
 #include <queue>

 #include "hal/snoop_logger.h"
 #include "os/log.h"
 #include "os/reactor.h"
 #include "os/thread.h"

 namespace {
 constexpr int INVALID_FD = -1;

 constexpr uint8_t kH4Command = 0x01;
 constexpr uint8_t kH4Acl = 0x02;
 constexpr uint8_t kH4Sco = 0x03;
 constexpr uint8_t kH4Event = 0x04;

 constexpr uint8_t kH4HeaderSize = 1;
 constexpr uint8_t kHciAclHeaderSize = 4;
 constexpr uint8_t kHciScoHeaderSize = 3;
 constexpr uint8_t kHciEvtHeaderSize = 2;
 constexpr int kBufSize = 1024 + 4 + 1;  // DeviceProperties::acl_data_packet_size_ + ACL header + H4 header

 int ConnectToRootCanal(const std::string& server, int port) {
   int socket_fd = socket(AF_INET, SOCK_STREAM, 0);
   if (socket_fd < 1) {
     LOG_ERROR("can't create socket: %s", strerror(errno));
     return INVALID_FD;
   }

   struct hostent* host;
   host = gethostbyname(server.c_str());
   if (host == nullptr) {
     LOG_ERROR("can't get server name");
     return INVALID_FD;
   }

   struct sockaddr_in serv_addr;
   memset((void*)&serv_addr, 0, sizeof(serv_addr));
   serv_addr.sin_family = AF_INET;
   serv_addr.sin_addr.s_addr = INADDR_ANY;
   serv_addr.sin_port = htons(port);

   int result = connect(socket_fd, (struct sockaddr*)&serv_addr, sizeof(serv_addr));
   if (result < 0) {
     LOG_ERROR("can't connect: %s", strerror(errno));
     return INVALID_FD;
   }

   timeval socket_timeout{
       .tv_sec = 3,
       .tv_usec = 0,
   };
   int ret = setsockopt(socket_fd, SOL_SOCKET, SO_RCVTIMEO, &socket_timeout, sizeof(socket_timeout));
   if (ret == -1) {
     LOG_ERROR("can't control socket fd: %s", strerror(errno));
     return INVALID_FD;
   }
   return socket_fd;
 }
 }  // namespace

 namespace bluetooth {
 namespace hal {

 const std::string SnoopLogger::DefaultFilePath = "/tmp/btsnoop_hci.log";
 const bool SnoopLogger::AlwaysFlush = true;

 class HciHalHostRootcanal : public HciHal {
  public:
   void registerIncomingPacketCallback(HciHalCallbacks* callback) override {
     std::lock_guard<std::mutex> lock(api_mutex_);
     LOG_INFO("%s before", __func__);
     {
       std::lock_guard<std::mutex> incoming_packet_callback_lock(incoming_packet_callback_mutex_);
       ASSERT(incoming_packet_callback_ == nullptr && callback != nullptr);
       incoming_packet_callback_ = callback;
     }
     LOG_INFO("%s after", __func__);
   }

   void unregisterIncomingPacketCallback() override {
     std::lock_guard<std::mutex> lock(api_mutex_);
     LOG_INFO("%s before", __func__);
     {
       std::lock_guard<std::mutex> incoming_packet_callback_lock(incoming_packet_callback_mutex_);
       incoming_packet_callback_ = nullptr;
     }
     LOG_INFO("%s after", __func__);
   }

   void sendHciCommand(HciPacket command) override {
     std::lock_guard<std::mutex> lock(api_mutex_);
     ASSERT(sock_fd_ != INVALID_FD);
     std::vector<uint8_t> packet = std::move(command);
     btsnoop_logger_->capture(packet, SnoopLogger::Direction::OUTGOING, SnoopLogger::PacketType::CMD);
     packet.insert(packet.cbegin(), kH4Command);
     write_to_rootcanal_fd(packet);
   }

   void sendAclData(HciPacket data) override {
     std::lock_guard<std::mutex> lock(api_mutex_);
     ASSERT(sock_fd_ != INVALID_FD);
     std::vector<uint8_t> packet = std::move(data);
     btsnoop_logger_->capture(packet, SnoopLogger::Direction::OUTGOING, SnoopLogger::PacketType::ACL);
     packet.insert(packet.cbegin(), kH4Acl);
     write_to_rootcanal_fd(packet);
   }

   void sendScoData(HciPacket data) override {
     std::lock_guard<std::mutex> lock(api_mutex_);
     ASSERT(sock_fd_ != INVALID_FD);
     std::vector<uint8_t> packet = std::move(data);
     btsnoop_logger_->capture(packet, SnoopLogger::Direction::OUTGOING, SnoopLogger::PacketType::SCO);
     packet.insert(packet.cbegin(), kH4Sco);
     write_to_rootcanal_fd(packet);
   }

  protected:
   void ListDependencies(ModuleList* list) override {
     list->add<SnoopLogger>();
   }

   void Start() override {
     std::lock_guard<std::mutex> lock(api_mutex_);
     ASSERT(sock_fd_ == INVALID_FD);
     sock_fd_ = ConnectToRootCanal(config_->GetServerAddress(), config_->GetPort());
     ASSERT(sock_fd_ != INVALID_FD);
     reactable_ = hci_incoming_thread_.GetReactor()->Register(
         sock_fd_, common::Bind(&HciHalHostRootcanal::incoming_packet_received, common::Unretained(this)),
         common::Closure());
     btsnoop_logger_ = GetDependency<SnoopLogger>();
     LOG_INFO("Rootcanal HAL opened successfully");
   }

   void Stop() override {
     std::lock_guard<std::mutex> lock(api_mutex_);
     LOG_INFO("Rootcanal HAL is closing");
     if (reactable_ != nullptr) {
       hci_incoming_thread_.GetReactor()->Unregister(reactable_);
       LOG_INFO("Rootcanal HAL is stopping, start waiting for last callback");
       // Wait up to 1 second for the last incoming packet callback to finish
       hci_incoming_thread_.GetReactor()->WaitForUnregisteredReactable(std::chrono::milliseconds(1000));
       LOG_INFO("Rootcanal HAL is stopping, finished waiting for last callback");
       ASSERT(sock_fd_ != INVALID_FD);
     }
     reactable_ = nullptr;
     {
       std::lock_guard<std::mutex> incoming_packet_callback_lock(incoming_packet_callback_mutex_);
       incoming_packet_callback_ = nullptr;
     }
     ::close(sock_fd_);
     sock_fd_ = INVALID_FD;
     LOG_INFO("Rootcanal HAL is closed");
   }

  private:
   // Held when APIs are called, NOT to be held during callbacks
   std::mutex api_mutex_;
   HciHalHostRootcanalConfig* config_ = HciHalHostRootcanalConfig::Get();
   HciHalCallbacks* incoming_packet_callback_ = nullptr;
   std::mutex incoming_packet_callback_mutex_;
   int sock_fd_ = INVALID_FD;
   bluetooth::os::Thread hci_incoming_thread_ =
       bluetooth::os::Thread("hci_incoming_thread", bluetooth::os::Thread::Priority::NORMAL);
   bluetooth::os::Reactor::Reactable* reactable_ = nullptr;
   std::queue<std::vector<uint8_t>> hci_outgoing_queue_;
   SnoopLogger* btsnoop_logger_ = nullptr;

   void write_to_rootcanal_fd(HciPacket packet) {
     // TODO: replace this with new queue when it's ready
     hci_outgoing_queue_.emplace(packet);
     if (hci_outgoing_queue_.size() == 1) {
       hci_incoming_thread_.GetReactor()->ModifyRegistration(
           reactable_, common::Bind(&HciHalHostRootcanal::incoming_packet_received, common::Unretained(this)),
           common::Bind(&HciHalHostRootcanal::send_packet_ready, common::Unretained(this)));
     }
   }

   void send_packet_ready() {
     std::lock_guard<std::mutex> lock(this->api_mutex_);
     auto packet_to_send = this->hci_outgoing_queue_.front();
     auto bytes_written = write(this->sock_fd_, (void*)packet_to_send.data(), packet_to_send.size());
     this->hci_outgoing_queue_.pop();
     if (bytes_written == -1) {
       abort();
     }
     if (hci_outgoing_queue_.empty()) {
       this->hci_incoming_thread_.GetReactor()->ModifyRegistration(
           this->reactable_, common::Bind(&HciHalHostRootcanal::incoming_packet_received, common::Unretained(this)),
           common::Closure());
     }
   }

   void incoming_packet_received() {
     {
       std::lock_guard<std::mutex> incoming_packet_callback_lock(incoming_packet_callback_mutex_);
       if (incoming_packet_callback_ == nullptr) {
         LOG_INFO("Dropping a packet");
         return;
       }
     }
     uint8_t buf[kBufSize] = {};

     ssize_t received_size;
     RUN_NO_INTR(received_size = recv(sock_fd_, buf, kH4HeaderSize, 0));
     ASSERT_LOG(received_size != -1, "Can't receive from socket: %s", strerror(errno));
     if (received_size == 0) {
       LOG_WARN("Can't read H4 header. EOF received");
       raise(SIGINT);
       return;
     }

     if (buf[0] == kH4Event) {
       RUN_NO_INTR(received_size = recv(sock_fd_, buf + kH4HeaderSize, kHciEvtHeaderSize, 0));
       ASSERT_LOG(received_size != -1, "Can't receive from socket: %s", strerror(errno));
       ASSERT_LOG(received_size == kHciEvtHeaderSize, "malformed HCI event header received");

       uint8_t hci_evt_parameter_total_length = buf[2];
       ssize_t payload_size;
       RUN_NO_INTR(payload_size =
                       recv(sock_fd_, buf + kH4HeaderSize + kHciEvtHeaderSize, hci_evt_parameter_total_length, 0));
       ASSERT_LOG(payload_size != -1, "Can't receive from socket: %s", strerror(errno));
       ASSERT_LOG(payload_size == hci_evt_parameter_total_length,
                  "malformed HCI event total parameter size received: %zu != %d", payload_size,
                  hci_evt_parameter_total_length);

       HciPacket receivedHciPacket;
       receivedHciPacket.assign(buf + kH4HeaderSize, buf + kH4HeaderSize + kHciEvtHeaderSize + payload_size);
       btsnoop_logger_->capture(receivedHciPacket, SnoopLogger::Direction::INCOMING, SnoopLogger::PacketType::EVT);
       {
         std::lock_guard<std::mutex> incoming_packet_callback_lock(incoming_packet_callback_mutex_);
         if (incoming_packet_callback_ == nullptr) {
           LOG_INFO("Dropping an event after processing");
           return;
         }
         incoming_packet_callback_->hciEventReceived(receivedHciPacket);
       }
     }

     if (buf[0] == kH4Acl) {
       RUN_NO_INTR(received_size = recv(sock_fd_, buf + kH4HeaderSize, kHciAclHeaderSize, 0));
       ASSERT_LOG(received_size != -1, "Can't receive from socket: %s", strerror(errno));
       ASSERT_LOG(received_size == kHciAclHeaderSize, "malformed ACL header received");

       uint16_t hci_acl_data_total_length = (buf[4] << 8) + buf[3];
       int payload_size;
       RUN_NO_INTR(payload_size = recv(sock_fd_, buf + kH4HeaderSize + kHciAclHeaderSize, hci_acl_data_total_length, 0));
       ASSERT_LOG(payload_size != -1, "Can't receive from socket: %s", strerror(errno));
       ASSERT_LOG(payload_size == hci_acl_data_total_length, "malformed ACL length received: %d != %d", payload_size,
                  hci_acl_data_total_length);
       ASSERT_LOG(hci_acl_data_total_length <= kBufSize - kH4HeaderSize - kHciAclHeaderSize, "packet too long");

       HciPacket receivedHciPacket;
       receivedHciPacket.assign(buf + kH4HeaderSize, buf + kH4HeaderSize + kHciAclHeaderSize + payload_size);
       btsnoop_logger_->capture(receivedHciPacket, SnoopLogger::Direction::INCOMING, SnoopLogger::PacketType::ACL);
       {
         std::lock_guard<std::mutex> incoming_packet_callback_lock(incoming_packet_callback_mutex_);
         if (incoming_packet_callback_ == nullptr) {
           LOG_INFO("Dropping an ACL packet after processing");
           return;
         }
         incoming_packet_callback_->aclDataReceived(receivedHciPacket);
       }
     }

     if (buf[0] == kH4Sco) {
       RUN_NO_INTR(received_size = recv(sock_fd_, buf + kH4HeaderSize, kHciScoHeaderSize, 0));
       ASSERT_LOG(received_size != -1, "Can't receive from socket: %s", strerror(errno));
       ASSERT_LOG(received_size == kHciScoHeaderSize, "malformed SCO header received");

       uint8_t hci_sco_data_total_length = buf[3];
       int payload_size;
       RUN_NO_INTR(payload_size = recv(sock_fd_, buf + kH4HeaderSize + kHciScoHeaderSize, hci_sco_data_total_length, 0));
       ASSERT_LOG(payload_size != -1, "Can't receive from socket: %s", strerror(errno));
       ASSERT_LOG(payload_size == hci_sco_data_total_length, "malformed SCO packet received: size mismatch");

       HciPacket receivedHciPacket;
       receivedHciPacket.assign(buf + kH4HeaderSize, buf + kH4HeaderSize + kHciScoHeaderSize + payload_size);
       btsnoop_logger_->capture(receivedHciPacket, SnoopLogger::Direction::INCOMING, SnoopLogger::PacketType::SCO);
       {
         std::lock_guard<std::mutex> incoming_packet_callback_lock(incoming_packet_callback_mutex_);
         if (incoming_packet_callback_ == nullptr) {
           LOG_INFO("Dropping a SCO packet after processing");
           return;
         }
         incoming_packet_callback_->scoDataReceived(receivedHciPacket);
       }
     }
     memset(buf, 0, kBufSize);
   }
 };

 const ModuleFactory HciHal::Factory = ModuleFactory([]() { return new HciHalHostRootcanal(); });

 }  // namespace hal
 }  // namespace bluetooth
	/*
	* Copyright 2019 The Android Open Source Project
	*
	* 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
	*
	* http://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 "hal/hci_hal_host_rootcanal.h"
	#include "hal/hci_hal.h"

	#include <netdb.h>
	#include <sys/socket.h>
	#include <sys/types.h>
	#include <unistd.h>
	#include <chrono>
	#include <csignal>
	#include <mutex>
	#include <queue>

	#include "hal/snoop_logger.h"
	#include "os/log.h"
	#include "os/reactor.h"
	#include "os/thread.h"

	namespace {
	constexpr int INVALID_FD = -1;

	constexpr uint8_t kH4Command = 0x01;
	constexpr uint8_t kH4Acl = 0x02;
	constexpr uint8_t kH4Sco = 0x03;
	constexpr uint8_t kH4Event = 0x04;

	constexpr uint8_t kH4HeaderSize = 1;
	constexpr uint8_t kHciAclHeaderSize = 4;
	constexpr uint8_t kHciScoHeaderSize = 3;
	constexpr uint8_t kHciEvtHeaderSize = 2;
	constexpr int kBufSize = 1024 + 4 + 1; // DeviceProperties::acl_data_packet_size_ + ACL header + H4 header

	int ConnectToRootCanal(const std::string& server, int port) {
	int socket_fd = socket(AF_INET, SOCK_STREAM, 0);
	if (socket_fd < 1) {
	LOG_ERROR("can't create socket: %s", strerror(errno));
	return INVALID_FD;
	}

	struct hostent* host;
	host = gethostbyname(server.c_str());
	if (host == nullptr) {
	LOG_ERROR("can't get server name");
	return INVALID_FD;
	}

	struct sockaddr_in serv_addr;
	memset((void*)&serv_addr, 0, sizeof(serv_addr));
	serv_addr.sin_family = AF_INET;
	serv_addr.sin_addr.s_addr = INADDR_ANY;
	serv_addr.sin_port = htons(port);

	int result = connect(socket_fd, (struct sockaddr*)&serv_addr, sizeof(serv_addr));
	if (result < 0) {
	LOG_ERROR("can't connect: %s", strerror(errno));
	return INVALID_FD;
	}

	timeval socket_timeout{
	.tv_sec = 3,
	.tv_usec = 0,
	};
	int ret = setsockopt(socket_fd, SOL_SOCKET, SO_RCVTIMEO, &socket_timeout, sizeof(socket_timeout));
	if (ret == -1) {
	LOG_ERROR("can't control socket fd: %s", strerror(errno));
	return INVALID_FD;
	}
	return socket_fd;
	}
	} // namespace

	namespace bluetooth {
	namespace hal {

	const std::string SnoopLogger::DefaultFilePath = "/tmp/btsnoop_hci.log";
	const bool SnoopLogger::AlwaysFlush = true;

	class HciHalHostRootcanal : public HciHal {
	public:
	void registerIncomingPacketCallback(HciHalCallbacks* callback) override {
	std::lock_guard<std::mutex> lock(api_mutex_);
	LOG_INFO("%s before", __func__);
	{
	std::lock_guard<std::mutex> incoming_packet_callback_lock(incoming_packet_callback_mutex_);
	ASSERT(incoming_packet_callback_ == nullptr && callback != nullptr);
	incoming_packet_callback_ = callback;
	}
	LOG_INFO("%s after", __func__);
	}

	void unregisterIncomingPacketCallback() override {
	std::lock_guard<std::mutex> lock(api_mutex_);
	LOG_INFO("%s before", __func__);
	{
	std::lock_guard<std::mutex> incoming_packet_callback_lock(incoming_packet_callback_mutex_);
	incoming_packet_callback_ = nullptr;
	}
	LOG_INFO("%s after", __func__);
	}

	void sendHciCommand(HciPacket command) override {
	std::lock_guard<std::mutex> lock(api_mutex_);
	ASSERT(sock_fd_ != INVALID_FD);
	std::vector<uint8_t> packet = std::move(command);
	btsnoop_logger_->capture(packet, SnoopLogger::Direction::OUTGOING, SnoopLogger::PacketType::CMD);
	packet.insert(packet.cbegin(), kH4Command);
	write_to_rootcanal_fd(packet);
	}

	void sendAclData(HciPacket data) override {
	std::lock_guard<std::mutex> lock(api_mutex_);
	ASSERT(sock_fd_ != INVALID_FD);
	std::vector<uint8_t> packet = std::move(data);
	btsnoop_logger_->capture(packet, SnoopLogger::Direction::OUTGOING, SnoopLogger::PacketType::ACL);
	packet.insert(packet.cbegin(), kH4Acl);
	write_to_rootcanal_fd(packet);
	}

	void sendScoData(HciPacket data) override {
	std::lock_guard<std::mutex> lock(api_mutex_);
	ASSERT(sock_fd_ != INVALID_FD);
	std::vector<uint8_t> packet = std::move(data);
	btsnoop_logger_->capture(packet, SnoopLogger::Direction::OUTGOING, SnoopLogger::PacketType::SCO);
	packet.insert(packet.cbegin(), kH4Sco);
	write_to_rootcanal_fd(packet);
	}

	protected:
	void ListDependencies(ModuleList* list) override {
	list->add<SnoopLogger>();
	}

	void Start() override {
	std::lock_guard<std::mutex> lock(api_mutex_);
	ASSERT(sock_fd_ == INVALID_FD);
	sock_fd_ = ConnectToRootCanal(config_->GetServerAddress(), config_->GetPort());
	ASSERT(sock_fd_ != INVALID_FD);
	reactable_ = hci_incoming_thread_.GetReactor()->Register(
	sock_fd_, common::Bind(&HciHalHostRootcanal::incoming_packet_received, common::Unretained(this)),
	common::Closure());
	btsnoop_logger_ = GetDependency<SnoopLogger>();
	LOG_INFO("Rootcanal HAL opened successfully");
	}

	void Stop() override {
	std::lock_guard<std::mutex> lock(api_mutex_);
	LOG_INFO("Rootcanal HAL is closing");
	if (reactable_ != nullptr) {
	hci_incoming_thread_.GetReactor()->Unregister(reactable_);
	LOG_INFO("Rootcanal HAL is stopping, start waiting for last callback");
	// Wait up to 1 second for the last incoming packet callback to finish
	hci_incoming_thread_.GetReactor()->WaitForUnregisteredReactable(std::chrono::milliseconds(1000));
	LOG_INFO("Rootcanal HAL is stopping, finished waiting for last callback");
	ASSERT(sock_fd_ != INVALID_FD);
	}
	reactable_ = nullptr;
	{
	std::lock_guard<std::mutex> incoming_packet_callback_lock(incoming_packet_callback_mutex_);
	incoming_packet_callback_ = nullptr;
	}
	::close(sock_fd_);
	sock_fd_ = INVALID_FD;
	LOG_INFO("Rootcanal HAL is closed");
	}

	private:
	// Held when APIs are called, NOT to be held during callbacks
	std::mutex api_mutex_;
	HciHalHostRootcanalConfig* config_ = HciHalHostRootcanalConfig::Get();
	HciHalCallbacks* incoming_packet_callback_ = nullptr;
	std::mutex incoming_packet_callback_mutex_;
	int sock_fd_ = INVALID_FD;
	bluetooth::os::Thread hci_incoming_thread_ =
	bluetooth::os::Thread("hci_incoming_thread", bluetooth::os::Thread::Priority::NORMAL);
	bluetooth::os::Reactor::Reactable* reactable_ = nullptr;
	std::queue<std::vector<uint8_t>> hci_outgoing_queue_;
	SnoopLogger* btsnoop_logger_ = nullptr;

	void write_to_rootcanal_fd(HciPacket packet) {
	// TODO: replace this with new queue when it's ready
	hci_outgoing_queue_.emplace(packet);
	if (hci_outgoing_queue_.size() == 1) {
	hci_incoming_thread_.GetReactor()->ModifyRegistration(
	reactable_, common::Bind(&HciHalHostRootcanal::incoming_packet_received, common::Unretained(this)),
	common::Bind(&HciHalHostRootcanal::send_packet_ready, common::Unretained(this)));
	}
	}

	void send_packet_ready() {
	std::lock_guard<std::mutex> lock(this->api_mutex_);
	auto packet_to_send = this->hci_outgoing_queue_.front();
	auto bytes_written = write(this->sock_fd_, (void*)packet_to_send.data(), packet_to_send.size());
	this->hci_outgoing_queue_.pop();
	if (bytes_written == -1) {
	abort();
	}
	if (hci_outgoing_queue_.empty()) {
	this->hci_incoming_thread_.GetReactor()->ModifyRegistration(
	this->reactable_, common::Bind(&HciHalHostRootcanal::incoming_packet_received, common::Unretained(this)),
	common::Closure());
	}
	}

	void incoming_packet_received() {
	{
	std::lock_guard<std::mutex> incoming_packet_callback_lock(incoming_packet_callback_mutex_);
	if (incoming_packet_callback_ == nullptr) {
	LOG_INFO("Dropping a packet");
	return;
	}
	}
	uint8_t buf[kBufSize] = {};

	ssize_t received_size;
	RUN_NO_INTR(received_size = recv(sock_fd_, buf, kH4HeaderSize, 0));
	ASSERT_LOG(received_size != -1, "Can't receive from socket: %s", strerror(errno));
	if (received_size == 0) {
	LOG_WARN("Can't read H4 header. EOF received");
	raise(SIGINT);
	return;
	}

	if (buf[0] == kH4Event) {
	RUN_NO_INTR(received_size = recv(sock_fd_, buf + kH4HeaderSize, kHciEvtHeaderSize, 0));
	ASSERT_LOG(received_size != -1, "Can't receive from socket: %s", strerror(errno));
	ASSERT_LOG(received_size == kHciEvtHeaderSize, "malformed HCI event header received");

	uint8_t hci_evt_parameter_total_length = buf[2];
	ssize_t payload_size;
	RUN_NO_INTR(payload_size =
	recv(sock_fd_, buf + kH4HeaderSize + kHciEvtHeaderSize, hci_evt_parameter_total_length, 0));
	ASSERT_LOG(payload_size != -1, "Can't receive from socket: %s", strerror(errno));
	ASSERT_LOG(payload_size == hci_evt_parameter_total_length,
	"malformed HCI event total parameter size received: %zu != %d", payload_size,
	hci_evt_parameter_total_length);

	HciPacket receivedHciPacket;
	receivedHciPacket.assign(buf + kH4HeaderSize, buf + kH4HeaderSize + kHciEvtHeaderSize + payload_size);
	btsnoop_logger_->capture(receivedHciPacket, SnoopLogger::Direction::INCOMING, SnoopLogger::PacketType::EVT);
	{
	std::lock_guard<std::mutex> incoming_packet_callback_lock(incoming_packet_callback_mutex_);
	if (incoming_packet_callback_ == nullptr) {
	LOG_INFO("Dropping an event after processing");
	return;
	}
	incoming_packet_callback_->hciEventReceived(receivedHciPacket);
	}
	}

	if (buf[0] == kH4Acl) {
	RUN_NO_INTR(received_size = recv(sock_fd_, buf + kH4HeaderSize, kHciAclHeaderSize, 0));
	ASSERT_LOG(received_size != -1, "Can't receive from socket: %s", strerror(errno));
	ASSERT_LOG(received_size == kHciAclHeaderSize, "malformed ACL header received");

	uint16_t hci_acl_data_total_length = (buf[4] << 8) + buf[3];
	int payload_size;
	RUN_NO_INTR(payload_size = recv(sock_fd_, buf + kH4HeaderSize + kHciAclHeaderSize, hci_acl_data_total_length, 0));
	ASSERT_LOG(payload_size != -1, "Can't receive from socket: %s", strerror(errno));
	ASSERT_LOG(payload_size == hci_acl_data_total_length, "malformed ACL length received: %d != %d", payload_size,
	hci_acl_data_total_length);
	ASSERT_LOG(hci_acl_data_total_length <= kBufSize - kH4HeaderSize - kHciAclHeaderSize, "packet too long");

	HciPacket receivedHciPacket;
	receivedHciPacket.assign(buf + kH4HeaderSize, buf + kH4HeaderSize + kHciAclHeaderSize + payload_size);
	btsnoop_logger_->capture(receivedHciPacket, SnoopLogger::Direction::INCOMING, SnoopLogger::PacketType::ACL);
	{
	std::lock_guard<std::mutex> incoming_packet_callback_lock(incoming_packet_callback_mutex_);
	if (incoming_packet_callback_ == nullptr) {
	LOG_INFO("Dropping an ACL packet after processing");
	return;
	}
	incoming_packet_callback_->aclDataReceived(receivedHciPacket);
	}
	}

	if (buf[0] == kH4Sco) {
	RUN_NO_INTR(received_size = recv(sock_fd_, buf + kH4HeaderSize, kHciScoHeaderSize, 0));
	ASSERT_LOG(received_size != -1, "Can't receive from socket: %s", strerror(errno));
	ASSERT_LOG(received_size == kHciScoHeaderSize, "malformed SCO header received");

	uint8_t hci_sco_data_total_length = buf[3];
	int payload_size;
	RUN_NO_INTR(payload_size = recv(sock_fd_, buf + kH4HeaderSize + kHciScoHeaderSize, hci_sco_data_total_length, 0));
	ASSERT_LOG(payload_size != -1, "Can't receive from socket: %s", strerror(errno));
	ASSERT_LOG(payload_size == hci_sco_data_total_length, "malformed SCO packet received: size mismatch");

	HciPacket receivedHciPacket;
	receivedHciPacket.assign(buf + kH4HeaderSize, buf + kH4HeaderSize + kHciScoHeaderSize + payload_size);
	btsnoop_logger_->capture(receivedHciPacket, SnoopLogger::Direction::INCOMING, SnoopLogger::PacketType::SCO);
	{
	std::lock_guard<std::mutex> incoming_packet_callback_lock(incoming_packet_callback_mutex_);
	if (incoming_packet_callback_ == nullptr) {
	LOG_INFO("Dropping a SCO packet after processing");
	return;
	}
	incoming_packet_callback_->scoDataReceived(receivedHciPacket);
	}
	}
	memset(buf, 0, kBufSize);
	}
	};

	const ModuleFactory HciHal::Factory = ModuleFactory([]() { return new HciHalHostRootcanal(); });

	} // namespace hal
	} // namespace bluetooth