system/bta/groups/groups.cc - LeafOS-Project/android_packages_modules_Bluetooth - Gitiles

 /*
  * Copyright 2021 HIMSA II K/S - www.himsa.com.
  * Represented by EHIMA - www.ehima.com
  *
  * 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 <base/logging.h>

 #include <algorithm>
 #include <limits>
 #include <map>
 #include <mutex>
 #include <unordered_set>

 #include "bta_groups.h"
 #include "btif/include/btif_profile_storage.h"
 #include "os/logging/log_adapter.h"
 #include "stack/include/bt_types.h"
 #include "types/bluetooth/uuid.h"
 #include "types/raw_address.h"

 using bluetooth::Uuid;

 namespace bluetooth {
 namespace groups {

 class DeviceGroupsImpl;
 DeviceGroupsImpl* instance;
 std::mutex instance_mutex;
 static constexpr int kMaxGroupId = 0xEF;

 class DeviceGroup {
  public:
   DeviceGroup(int group_id, Uuid uuid)
       : group_id_(group_id), group_uuid_(uuid) {}
   void Add(const RawAddress& addr) { devices_.insert(addr); }
   void Remove(const RawAddress& addr) { devices_.erase(addr); }
   bool Contains(const RawAddress& addr) const {
     return (devices_.count(addr) != 0);
   }

   void ForEachDevice(std::function<void(const RawAddress&)> cb) const {
     for (auto const& addr : devices_) {
       cb(addr);
     }
   }

   int Size(void) const { return devices_.size(); }
   int GetGroupId(void) const { return group_id_; }
   const Uuid& GetUuid(void) const { return group_uuid_; }

  private:
   friend std::ostream& operator<<(std::ostream& out,
                                   const bluetooth::groups::DeviceGroup& value);
   int group_id_;
   Uuid group_uuid_;
   std::unordered_set<RawAddress> devices_;
 };

 class DeviceGroupsImpl : public DeviceGroups {
   static constexpr uint8_t GROUP_STORAGE_CURRENT_LAYOUT_MAGIC = 0x10;
   static constexpr size_t GROUP_STORAGE_HEADER_SZ =
       sizeof(GROUP_STORAGE_CURRENT_LAYOUT_MAGIC) +
       sizeof(uint8_t); /* num_of_groups */
   static constexpr size_t GROUP_STORAGE_ENTRY_SZ =
       sizeof(uint8_t) /* group_id */ + Uuid::kNumBytes128;

  public:
   DeviceGroupsImpl(DeviceGroupsCallbacks* callbacks) {
     AddCallbacks(callbacks);
     btif_storage_load_bonded_groups();
   }

   int GetGroupId(const RawAddress& addr, Uuid uuid) const override {
     for (const auto& [id, g] : groups_) {
       if ((g.Contains(addr)) && (uuid == g.GetUuid())) return id;
     }
     return kGroupUnknown;
   }

   void add_to_group(const RawAddress& addr, DeviceGroup* group) {
     group->Add(addr);

     bool first_device_in_group = (group->Size() == 1);

     for (auto c : callbacks_) {
       if (first_device_in_group) {
         c->OnGroupAdded(addr, group->GetUuid(), group->GetGroupId());
       } else {
         c->OnGroupMemberAdded(addr, group->GetGroupId());
       }
     }
   }

   int AddDevice(const RawAddress& addr, Uuid uuid, int group_id) override {
     DeviceGroup* group = nullptr;

     if (group_id == kGroupUnknown) {
       auto gid = GetGroupId(addr, uuid);
       if (gid != kGroupUnknown) return gid;
       group = create_group(uuid);
     } else {
       group = get_or_create_group_with_id(group_id, uuid);
       if (!group) {
         return kGroupUnknown;
       }
     }

     LOG_ASSERT(group);

     if (group->Contains(addr)) {
       LOG(ERROR) << __func__ << " device " << ADDRESS_TO_LOGGABLE_STR(addr)
                  << " already in the group: " << group_id;
       return group->GetGroupId();
     }

     add_to_group(addr, group);

     btif_storage_add_groups(addr);
     return group->GetGroupId();
   }

   void RemoveDevice(const RawAddress& addr, int group_id) override {
     int num_of_groups_dev_belongs = 0;

     /* Remove from all the groups. Usually happens on unbond */
     for (auto it = groups_.begin(); it != groups_.end();) {
       auto& [id, g] = *it;
       if (!g.Contains(addr)) {
         ++it;
         continue;
       }

       num_of_groups_dev_belongs++;

       if ((group_id != bluetooth::groups::kGroupUnknown) && (group_id != id)) {
         ++it;
         continue;
       }

       num_of_groups_dev_belongs--;

       g.Remove(addr);
       for (auto c : callbacks_) {
         c->OnGroupMemberRemoved(addr, id);
       }

       if (g.Size() == 0) {
         for (auto c : callbacks_) {
           c->OnGroupRemoved(g.GetUuid(), g.GetGroupId());
         }
         it = groups_.erase(it);
       } else {
         ++it;
       }
     }

     btif_storage_remove_groups(addr);
     if (num_of_groups_dev_belongs > 0) {
       btif_storage_add_groups(addr);
     }
   }

   bool SerializeGroups(const RawAddress& addr,
                        std::vector<uint8_t>& out) const {
     auto num_groups = std::count_if(
         groups_.begin(), groups_.end(), [&addr](auto& id_group_pair) {
           return id_group_pair.second.Contains(addr);
         });
     if ((num_groups == 0) || (num_groups > std::numeric_limits<uint8_t>::max()))
       return false;

     out.resize(GROUP_STORAGE_HEADER_SZ + (num_groups * GROUP_STORAGE_ENTRY_SZ));
     auto* ptr = out.data();

     /* header */
     UINT8_TO_STREAM(ptr, GROUP_STORAGE_CURRENT_LAYOUT_MAGIC);
     UINT8_TO_STREAM(ptr, num_groups);

     /* group entries */
     for (const auto& [id, g] : groups_) {
       if (g.Contains(addr)) {
         UINT8_TO_STREAM(ptr, id);

         Uuid::UUID128Bit uuid128 = g.GetUuid().To128BitLE();
         memcpy(ptr, uuid128.data(), Uuid::kNumBytes128);
         ptr += Uuid::kNumBytes128;
       }
     }

     return true;
   }

   void DeserializeGroups(const RawAddress& addr,
                          const std::vector<uint8_t>& in) {
     if (in.size() < GROUP_STORAGE_HEADER_SZ + GROUP_STORAGE_ENTRY_SZ) return;

     auto* ptr = in.data();

     uint8_t magic;
     STREAM_TO_UINT8(magic, ptr);

     if (magic == GROUP_STORAGE_CURRENT_LAYOUT_MAGIC) {
       uint8_t num_groups;
       STREAM_TO_UINT8(num_groups, ptr);

       if (in.size() <
           GROUP_STORAGE_HEADER_SZ + (num_groups * GROUP_STORAGE_ENTRY_SZ)) {
         LOG(ERROR) << "Invalid persistent storage data";
         return;
       }

       /* group entries */
       while (num_groups--) {
         uint8_t id;
         STREAM_TO_UINT8(id, ptr);

         Uuid::UUID128Bit uuid128;
         STREAM_TO_ARRAY(uuid128.data(), ptr, (int)Uuid::kNumBytes128);

         auto* group =
             get_or_create_group_with_id(id, Uuid::From128BitLE(uuid128));
         if (group) add_to_group(addr, group);

         for (auto c : callbacks_) {
           c->OnGroupAddFromStorage(addr, Uuid::From128BitLE(uuid128), id);
         }
       }
     }
   }

   void AddCallbacks(DeviceGroupsCallbacks* callbacks) {
     callbacks_.push_back(std::move(callbacks));

     /* Notify new user about known groups */
     for (const auto& [id, g] : groups_) {
       auto group_uuid = g.GetUuid();
       auto group_id = g.GetGroupId();
       g.ForEachDevice([&](auto& dev) {
         callbacks->OnGroupAdded(dev, group_uuid, group_id);
       });
     }
   }

   bool Clear(DeviceGroupsCallbacks* callbacks) {
     auto it = find_if(callbacks_.begin(), callbacks_.end(),
                       [callbacks](auto c) { return c == callbacks; });

     if (it != callbacks_.end()) callbacks_.erase(it);

     if (callbacks_.size() != 0) {
       return false;
     }
     /* When all clients were unregistered */
     groups_.clear();
     return true;
   }

   void Dump(int fd) {
     std::stringstream stream;

     stream << "  Num. registered clients: " << callbacks_.size() << std::endl;
     stream << "  Groups:\n";
     for (const auto& kv_pair : groups_) {
       stream << kv_pair.second << std::endl;
     }

     dprintf(fd, "%s", stream.str().c_str());
   }

  private:
   DeviceGroup* find_device_group(int group_id) {
     return groups_.count(group_id) ? &groups_.at(group_id) : nullptr;
   }

   DeviceGroup* get_or_create_group_with_id(int group_id, Uuid uuid) {
     auto group = find_device_group(group_id);
     if (group) {
       if (group->GetUuid() != uuid) {
         LOG(ERROR) << __func__ << " group " << group_id
                    << " exists but for different uuid: " << group->GetUuid()
                    << ", user request uuid: " << uuid;
         return nullptr;
       }

       LOG(INFO) << __func__ << " group already exists: " << group_id;
       return group;
     }

     DeviceGroup new_group(group_id, uuid);
     groups_.insert({group_id, std::move(new_group)});

     return &groups_.at(group_id);
   }

   DeviceGroup* create_group(Uuid& uuid) {
     /* Generate new group id and return empty group */
     /* Find first free id */

     int group_id = -1;
     for (int i = 1; i < kMaxGroupId; i++) {
       if (groups_.count(i) == 0) {
         group_id = i;
         break;
       }
     }

     if (group_id < 0) {
       LOG(ERROR) << __func__ << " too many groups";
       return nullptr;
     }

     DeviceGroup group(group_id, uuid);
     groups_.insert({group_id, std::move(group)});

     return &groups_.at(group_id);
   }

   std::map<int, DeviceGroup> groups_;
   std::list<DeviceGroupsCallbacks*> callbacks_;
 };

 void DeviceGroups::Initialize(DeviceGroupsCallbacks* callbacks) {
   std::scoped_lock<std::mutex> lock(instance_mutex);
   if (instance == nullptr) {
     instance = new DeviceGroupsImpl(callbacks);
     return;
   }

   instance->AddCallbacks(callbacks);
 }

 void DeviceGroups::AddFromStorage(const RawAddress& addr,
                                   const std::vector<uint8_t>& in) {
   if (!instance) {
     LOG(ERROR) << __func__ << ": Not initialized yet";
     return;
   }

   instance->DeserializeGroups(addr, in);
 }

 bool DeviceGroups::GetForStorage(const RawAddress& addr,
                                  std::vector<uint8_t>& out) {
   if (!instance) {
     LOG(ERROR) << __func__ << ": Not initialized yet";
     return false;
   }

   return instance->SerializeGroups(addr, out);
 }

 void DeviceGroups::CleanUp(DeviceGroupsCallbacks* callbacks) {
   std::scoped_lock<std::mutex> lock(instance_mutex);
   if (!instance) return;

   if (instance->Clear(callbacks)) {
     delete (instance);
     instance = nullptr;
   }
 }

 std::ostream& operator<<(std::ostream& out,
                          bluetooth::groups::DeviceGroup const& group) {
   out << "    == Group id: " << group.group_id_ << " == \n"
       << "      Uuid: " << group.group_uuid_ << std::endl;
   out << "      Devices:\n";
   for (auto const& addr : group.devices_) {
     out << "        " << ADDRESS_TO_LOGGABLE_STR(addr) << std::endl;
   }
   return out;
 }

 void DeviceGroups::DebugDump(int fd) {
   std::scoped_lock<std::mutex> lock(instance_mutex);
   dprintf(fd, "Device Groups Manager:\n");
   if (instance)
     instance->Dump(fd);
   else
     dprintf(fd, "  Not initialized \n");
 }

 DeviceGroups* DeviceGroups::Get() { return instance; }

 }  // namespace groups
 }  // namespace bluetooth
	/*
	* Copyright 2021 HIMSA II K/S - www.himsa.com.
	* Represented by EHIMA - www.ehima.com
	*
	* 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 <base/logging.h>

	#include <algorithm>
	#include <limits>
	#include <map>
	#include <mutex>
	#include <unordered_set>

	#include "bta_groups.h"
	#include "btif/include/btif_profile_storage.h"
	#include "os/logging/log_adapter.h"
	#include "stack/include/bt_types.h"
	#include "types/bluetooth/uuid.h"
	#include "types/raw_address.h"

	using bluetooth::Uuid;

	namespace bluetooth {
	namespace groups {

	class DeviceGroupsImpl;
	DeviceGroupsImpl* instance;
	std::mutex instance_mutex;
	static constexpr int kMaxGroupId = 0xEF;

	class DeviceGroup {
	public:
	DeviceGroup(int group_id, Uuid uuid)
	: group_id_(group_id), group_uuid_(uuid) {}
	void Add(const RawAddress& addr) { devices_.insert(addr); }
	void Remove(const RawAddress& addr) { devices_.erase(addr); }
	bool Contains(const RawAddress& addr) const {
	return (devices_.count(addr) != 0);
	}

	void ForEachDevice(std::function<void(const RawAddress&)> cb) const {
	for (auto const& addr : devices_) {
	cb(addr);
	}
	}

	int Size(void) const { return devices_.size(); }
	int GetGroupId(void) const { return group_id_; }
	const Uuid& GetUuid(void) const { return group_uuid_; }

	private:
	friend std::ostream& operator<<(std::ostream& out,
	const bluetooth::groups::DeviceGroup& value);
	int group_id_;
	Uuid group_uuid_;
	std::unordered_set<RawAddress> devices_;
	};

	class DeviceGroupsImpl : public DeviceGroups {
	static constexpr uint8_t GROUP_STORAGE_CURRENT_LAYOUT_MAGIC = 0x10;
	static constexpr size_t GROUP_STORAGE_HEADER_SZ =
	sizeof(GROUP_STORAGE_CURRENT_LAYOUT_MAGIC) +
	sizeof(uint8_t); /* num_of_groups */
	static constexpr size_t GROUP_STORAGE_ENTRY_SZ =
	sizeof(uint8_t) /* group_id */ + Uuid::kNumBytes128;

	public:
	DeviceGroupsImpl(DeviceGroupsCallbacks* callbacks) {
	AddCallbacks(callbacks);
	btif_storage_load_bonded_groups();
	}

	int GetGroupId(const RawAddress& addr, Uuid uuid) const override {
	for (const auto& [id, g] : groups_) {
	if ((g.Contains(addr)) && (uuid == g.GetUuid())) return id;
	}
	return kGroupUnknown;
	}

	void add_to_group(const RawAddress& addr, DeviceGroup* group) {
	group->Add(addr);

	bool first_device_in_group = (group->Size() == 1);

	for (auto c : callbacks_) {
	if (first_device_in_group) {
	c->OnGroupAdded(addr, group->GetUuid(), group->GetGroupId());
	} else {
	c->OnGroupMemberAdded(addr, group->GetGroupId());
	}
	}
	}

	int AddDevice(const RawAddress& addr, Uuid uuid, int group_id) override {
	DeviceGroup* group = nullptr;

	if (group_id == kGroupUnknown) {
	auto gid = GetGroupId(addr, uuid);
	if (gid != kGroupUnknown) return gid;
	group = create_group(uuid);
	} else {
	group = get_or_create_group_with_id(group_id, uuid);
	if (!group) {
	return kGroupUnknown;
	}
	}

	LOG_ASSERT(group);

	if (group->Contains(addr)) {
	LOG(ERROR) << __func__ << " device " << ADDRESS_TO_LOGGABLE_STR(addr)
	<< " already in the group: " << group_id;
	return group->GetGroupId();
	}

	add_to_group(addr, group);

	btif_storage_add_groups(addr);
	return group->GetGroupId();
	}

	void RemoveDevice(const RawAddress& addr, int group_id) override {
	int num_of_groups_dev_belongs = 0;

	/* Remove from all the groups. Usually happens on unbond */
	for (auto it = groups_.begin(); it != groups_.end();) {
	auto& [id, g] = *it;
	if (!g.Contains(addr)) {
	++it;
	continue;
	}

	num_of_groups_dev_belongs++;

	if ((group_id != bluetooth::groups::kGroupUnknown) && (group_id != id)) {
	++it;
	continue;
	}

	num_of_groups_dev_belongs--;

	g.Remove(addr);
	for (auto c : callbacks_) {
	c->OnGroupMemberRemoved(addr, id);
	}

	if (g.Size() == 0) {
	for (auto c : callbacks_) {
	c->OnGroupRemoved(g.GetUuid(), g.GetGroupId());
	}
	it = groups_.erase(it);
	} else {
	++it;
	}
	}

	btif_storage_remove_groups(addr);
	if (num_of_groups_dev_belongs > 0) {
	btif_storage_add_groups(addr);
	}
	}

	bool SerializeGroups(const RawAddress& addr,
	std::vector<uint8_t>& out) const {
	auto num_groups = std::count_if(
	groups_.begin(), groups_.end(), [&addr](auto& id_group_pair) {
	return id_group_pair.second.Contains(addr);
	});
	if ((num_groups == 0) \|\| (num_groups > std::numeric_limits<uint8_t>::max()))
	return false;

	out.resize(GROUP_STORAGE_HEADER_SZ + (num_groups * GROUP_STORAGE_ENTRY_SZ));
	auto* ptr = out.data();

	/* header */
	UINT8_TO_STREAM(ptr, GROUP_STORAGE_CURRENT_LAYOUT_MAGIC);
	UINT8_TO_STREAM(ptr, num_groups);

	/* group entries */
	for (const auto& [id, g] : groups_) {
	if (g.Contains(addr)) {
	UINT8_TO_STREAM(ptr, id);

	Uuid::UUID128Bit uuid128 = g.GetUuid().To128BitLE();
	memcpy(ptr, uuid128.data(), Uuid::kNumBytes128);
	ptr += Uuid::kNumBytes128;
	}
	}

	return true;
	}

	void DeserializeGroups(const RawAddress& addr,
	const std::vector<uint8_t>& in) {
	if (in.size() < GROUP_STORAGE_HEADER_SZ + GROUP_STORAGE_ENTRY_SZ) return;

	auto* ptr = in.data();

	uint8_t magic;
	STREAM_TO_UINT8(magic, ptr);

	if (magic == GROUP_STORAGE_CURRENT_LAYOUT_MAGIC) {
	uint8_t num_groups;
	STREAM_TO_UINT8(num_groups, ptr);

	if (in.size() <
	GROUP_STORAGE_HEADER_SZ + (num_groups * GROUP_STORAGE_ENTRY_SZ)) {
	LOG(ERROR) << "Invalid persistent storage data";
	return;
	}

	/* group entries */
	while (num_groups--) {
	uint8_t id;
	STREAM_TO_UINT8(id, ptr);

	Uuid::UUID128Bit uuid128;
	STREAM_TO_ARRAY(uuid128.data(), ptr, (int)Uuid::kNumBytes128);

	auto* group =
	get_or_create_group_with_id(id, Uuid::From128BitLE(uuid128));
	if (group) add_to_group(addr, group);

	for (auto c : callbacks_) {
	c->OnGroupAddFromStorage(addr, Uuid::From128BitLE(uuid128), id);
	}
	}
	}
	}

	void AddCallbacks(DeviceGroupsCallbacks* callbacks) {
	callbacks_.push_back(std::move(callbacks));

	/* Notify new user about known groups */
	for (const auto& [id, g] : groups_) {
	auto group_uuid = g.GetUuid();
	auto group_id = g.GetGroupId();
	g.ForEachDevice([&](auto& dev) {
	callbacks->OnGroupAdded(dev, group_uuid, group_id);
	});
	}
	}

	bool Clear(DeviceGroupsCallbacks* callbacks) {
	auto it = find_if(callbacks_.begin(), callbacks_.end(),
	[callbacks](auto c) { return c == callbacks; });

	if (it != callbacks_.end()) callbacks_.erase(it);

	if (callbacks_.size() != 0) {
	return false;
	}
	/* When all clients were unregistered */
	groups_.clear();
	return true;
	}

	void Dump(int fd) {
	std::stringstream stream;

	stream << " Num. registered clients: " << callbacks_.size() << std::endl;
	stream << " Groups:\n";
	for (const auto& kv_pair : groups_) {
	stream << kv_pair.second << std::endl;
	}

	dprintf(fd, "%s", stream.str().c_str());
	}

	private:
	DeviceGroup* find_device_group(int group_id) {
	return groups_.count(group_id) ? &groups_.at(group_id) : nullptr;
	}

	DeviceGroup* get_or_create_group_with_id(int group_id, Uuid uuid) {
	auto group = find_device_group(group_id);
	if (group) {
	if (group->GetUuid() != uuid) {
	LOG(ERROR) << __func__ << " group " << group_id
	<< " exists but for different uuid: " << group->GetUuid()
	<< ", user request uuid: " << uuid;
	return nullptr;
	}

	LOG(INFO) << __func__ << " group already exists: " << group_id;
	return group;
	}

	DeviceGroup new_group(group_id, uuid);
	groups_.insert({group_id, std::move(new_group)});

	return &groups_.at(group_id);
	}

	DeviceGroup* create_group(Uuid& uuid) {
	/* Generate new group id and return empty group */
	/* Find first free id */

	int group_id = -1;
	for (int i = 1; i < kMaxGroupId; i++) {
	if (groups_.count(i) == 0) {
	group_id = i;
	break;
	}
	}

	if (group_id < 0) {
	LOG(ERROR) << __func__ << " too many groups";
	return nullptr;
	}

	DeviceGroup group(group_id, uuid);
	groups_.insert({group_id, std::move(group)});

	return &groups_.at(group_id);
	}

	std::map<int, DeviceGroup> groups_;
	std::list<DeviceGroupsCallbacks*> callbacks_;
	};

	void DeviceGroups::Initialize(DeviceGroupsCallbacks* callbacks) {
	std::scoped_lock<std::mutex> lock(instance_mutex);
	if (instance == nullptr) {
	instance = new DeviceGroupsImpl(callbacks);
	return;
	}

	instance->AddCallbacks(callbacks);
	}

	void DeviceGroups::AddFromStorage(const RawAddress& addr,
	const std::vector<uint8_t>& in) {
	if (!instance) {
	LOG(ERROR) << __func__ << ": Not initialized yet";
	return;
	}

	instance->DeserializeGroups(addr, in);
	}

	bool DeviceGroups::GetForStorage(const RawAddress& addr,
	std::vector<uint8_t>& out) {
	if (!instance) {
	LOG(ERROR) << __func__ << ": Not initialized yet";
	return false;
	}

	return instance->SerializeGroups(addr, out);
	}

	void DeviceGroups::CleanUp(DeviceGroupsCallbacks* callbacks) {
	std::scoped_lock<std::mutex> lock(instance_mutex);
	if (!instance) return;

	if (instance->Clear(callbacks)) {
	delete (instance);
	instance = nullptr;
	}
	}

	std::ostream& operator<<(std::ostream& out,
	bluetooth::groups::DeviceGroup const& group) {
	out << " == Group id: " << group.group_id_ << " == \n"
	<< " Uuid: " << group.group_uuid_ << std::endl;
	out << " Devices:\n";
	for (auto const& addr : group.devices_) {
	out << " " << ADDRESS_TO_LOGGABLE_STR(addr) << std::endl;
	}
	return out;
	}

	void DeviceGroups::DebugDump(int fd) {
	std::scoped_lock<std::mutex> lock(instance_mutex);
	dprintf(fd, "Device Groups Manager:\n");
	if (instance)
	instance->Dump(fd);
	else
	dprintf(fd, " Not initialized \n");
	}

	DeviceGroups* DeviceGroups::Get() { return instance; }

	} // namespace groups
	} // namespace bluetooth