/****************************************************************************** * * Copyright 2014 Google, Inc. * * 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. * ******************************************************************************/ #define LOG_TAG "bt_btif_config" #include "btif_config.h" #include #include #include #include #include #include #include #include #include #include #include #include #include "btcore/include/module.h" #include "btif_api.h" #include "btif_common.h" #include "btif_config_cache.h" #include "btif_config_transcode.h" #include "btif_keystore.h" #include "btif_metrics_logging.h" #include "common/address_obfuscator.h" #include "common/metric_id_allocator.h" #include "main/shim/config.h" #include "main/shim/shim.h" #include "osi/include/alarm.h" #include "osi/include/allocator.h" #include "osi/include/compat.h" #include "osi/include/config.h" #include "osi/include/log.h" #include "osi/include/osi.h" #include "osi/include/properties.h" #include "raw_address.h" #define BT_CONFIG_SOURCE_TAG_NUM 1010001 #define TEMPORARY_SECTION_CAPACITY 10000 #define INFO_SECTION "Info" #define FILE_TIMESTAMP "TimeCreated" #define FILE_SOURCE "FileSource" #define TIME_STRING_LENGTH sizeof("YYYY-MM-DD HH:MM:SS") #define DISABLED "disabled" static const char* TIME_STRING_FORMAT = "%Y-%m-%d %H:%M:%S"; #define BT_CONFIG_METRICS_SECTION "Metrics" #define BT_CONFIG_METRICS_SALT_256BIT "Salt256Bit" #define BT_CONFIG_METRICS_ID_KEY "MetricsId" using bluetooth::bluetooth_keystore::BluetoothKeystoreInterface; using bluetooth::common::AddressObfuscator; using bluetooth::common::MetricIdAllocator; // TODO(armansito): Find a better way than searching by a hardcoded path. #if defined(OS_GENERIC) static const char* CONFIG_FILE_PATH = "bt_config.conf"; static const char* CONFIG_BACKUP_PATH = "bt_config.bak"; static const char* CONFIG_LEGACY_FILE_PATH = "bt_config.xml"; #else // !defined(OS_GENERIC) static const char* CONFIG_FILE_PATH = "/data/misc/bluedroid/bt_config.conf"; static const char* CONFIG_BACKUP_PATH = "/data/misc/bluedroid/bt_config.bak"; static const char* CONFIG_LEGACY_FILE_PATH = "/data/misc/bluedroid/bt_config.xml"; #endif // defined(OS_GENERIC) static const uint64_t CONFIG_SETTLE_PERIOD_MS = 3000; static void timer_config_save_cb(void* data); static void btif_config_write(uint16_t event, char* p_param); static bool is_factory_reset(void); static void delete_config_files(void); static std::unique_ptr btif_config_open(const char* filename); // Key attestation static bool config_checksum_pass(int check_bit) { return ((get_common_criteria_config_compare_result() & check_bit) == check_bit); } static bool btif_in_encrypt_key_name_list(std::string key); static const int CONFIG_FILE_COMPARE_PASS = 1; static const int CONFIG_BACKUP_COMPARE_PASS = 2; static const std::string ENCRYPTED_STR = "encrypted"; static const std::string CONFIG_FILE_PREFIX = "bt_config-origin"; static const std::string CONFIG_FILE_HASH = "hash"; static const int ENCRYPT_KEY_NAME_LIST_SIZE = 7; static const std::string encrypt_key_name_list[] = { "LinkKey", "LE_KEY_PENC", "LE_KEY_PID", "LE_KEY_LID", "LE_KEY_PCSRK", "LE_KEY_LENC", "LE_KEY_LCSRK"}; static enum ConfigSource { NOT_LOADED, ORIGINAL, BACKUP, LEGACY, NEW_FILE, RESET } btif_config_source = NOT_LOADED; static char btif_config_time_created[TIME_STRING_LENGTH]; static BluetoothKeystoreInterface* get_bluetooth_keystore_interface() { return bluetooth::bluetooth_keystore::getBluetoothKeystoreInterface(); } // TODO(zachoverflow): Move these two functions out, because they are too // specific for this file // {grumpy-cat/no, monty-python/you-make-me-sad} bool btif_get_device_type(const RawAddress& bda, int* p_device_type) { if (p_device_type == NULL) return false; std::string addrstr = bda.ToString(); const char* bd_addr_str = addrstr.c_str(); if (!btif_config_get_int(bd_addr_str, "DevType", p_device_type)) return false; LOG_INFO("Device [%s] device type %d", bd_addr_str, *p_device_type); return true; } bool btif_get_address_type(const RawAddress& bda, tBLE_ADDR_TYPE* p_addr_type) { if (p_addr_type == NULL) return false; std::string addrstr = bda.ToString(); const char* bd_addr_str = addrstr.c_str(); int val = 0; if (!btif_config_get_int(bd_addr_str, "AddrType", &val)) return false; *p_addr_type = static_cast(val); LOG_DEBUG("Device [%s] address type %s", bd_addr_str, AddressTypeText(*p_addr_type).c_str()); return true; } /** * Read metrics salt from config file, if salt is invalid or does not exist, * generate new one and save it to config */ static void read_or_set_metrics_salt() { AddressObfuscator::Octet32 metrics_salt = {}; size_t metrics_salt_length = metrics_salt.size(); if (!btif_config_get_bin(BT_CONFIG_METRICS_SECTION, BT_CONFIG_METRICS_SALT_256BIT, metrics_salt.data(), &metrics_salt_length)) { LOG(WARNING) << __func__ << ": Failed to read metrics salt from config"; // Invalidate salt metrics_salt.fill(0); } if (metrics_salt_length != metrics_salt.size()) { LOG(ERROR) << __func__ << ": Metrics salt length incorrect, " << metrics_salt_length << " instead of " << metrics_salt.size(); // Invalidate salt metrics_salt.fill(0); } if (!AddressObfuscator::IsSaltValid(metrics_salt)) { LOG(INFO) << __func__ << ": Metrics salt is not invalid, creating new one"; if (RAND_bytes(metrics_salt.data(), metrics_salt.size()) != 1) { LOG(FATAL) << __func__ << "Failed to generate salt for metrics"; } if (!btif_config_set_bin(BT_CONFIG_METRICS_SECTION, BT_CONFIG_METRICS_SALT_256BIT, metrics_salt.data(), metrics_salt.size())) { LOG(FATAL) << __func__ << "Failed to write metrics salt to config"; } } AddressObfuscator::GetInstance()->Initialize(metrics_salt); } /** * Initialize metric id allocator by reading metric_id from config by mac * address. If there is no metric id for a mac address, then allocate it a new * metric id. */ static void init_metric_id_allocator() { std::unordered_map paired_device_map; // When user update the system, there will be devices paired with older // version of android without a metric id. std::vector addresses_without_id; for (const auto& mac_address : btif_config_get_paired_devices()) { auto addr_str = mac_address.ToString(); // if the section name is a mac address bool is_valid_id_found = false; if (btif_config_exist(addr_str, BT_CONFIG_METRICS_ID_KEY)) { // there is one metric id under this mac_address int id = 0; btif_config_get_int(addr_str, BT_CONFIG_METRICS_ID_KEY, &id); if (is_valid_id_from_metric_id_allocator(id)) { paired_device_map[mac_address] = id; is_valid_id_found = true; } } if (!is_valid_id_found) { addresses_without_id.push_back(mac_address); } } // Initialize MetricIdAllocator MetricIdAllocator::Callback save_device_callback = [](const RawAddress& address, const int id) { return btif_config_set_int(address.ToString(), BT_CONFIG_METRICS_ID_KEY, id); }; MetricIdAllocator::Callback forget_device_callback = [](const RawAddress& address, const int id) { return btif_config_remove(address.ToString(), BT_CONFIG_METRICS_ID_KEY); }; if (!init_metric_id_allocator(paired_device_map, std::move(save_device_callback), std::move(forget_device_callback))) { LOG(FATAL) << __func__ << "Failed to initialize MetricIdAllocator"; } // Add device_without_id for (auto& address : addresses_without_id) { allocate_metric_id_from_metric_id_allocator(address); save_metric_id_from_metric_id_allocator(address); } } static std::recursive_mutex config_lock; // protects operations on |config|. static alarm_t* config_timer; // limited btif config cache capacity static BtifConfigCache btif_config_cache(TEMPORARY_SECTION_CAPACITY); // Module lifecycle functions static future_t* init(void) { if (bluetooth::shim::is_any_gd_enabled()) { CHECK(bluetooth::shim::is_gd_stack_started_up()); // TODO (b/158035889) Migrate metrics module to GD read_or_set_metrics_salt(); init_metric_id_allocator(); return future_new_immediate(FUTURE_SUCCESS); } std::unique_lock lock(config_lock); std::unique_ptr config; if (is_factory_reset()) delete_config_files(); std::string file_source; if (config_checksum_pass(CONFIG_FILE_COMPARE_PASS)) { config = btif_config_open(CONFIG_FILE_PATH); btif_config_source = ORIGINAL; } if (!config) { LOG_WARN("%s unable to load config file: %s; using backup.", __func__, CONFIG_FILE_PATH); if (config_checksum_pass(CONFIG_BACKUP_COMPARE_PASS)) { config = btif_config_open(CONFIG_BACKUP_PATH); btif_config_source = BACKUP; file_source = "Backup"; } } if (!config) { LOG_WARN("%s unable to load backup; attempting to transcode legacy file.", __func__); config = btif_config_transcode(CONFIG_LEGACY_FILE_PATH); btif_config_source = LEGACY; file_source = "Legacy"; } if (!config) { LOG_ERROR("%s unable to transcode legacy file; creating empty config.", __func__); config = config_new_empty(); btif_config_source = NEW_FILE; file_source = "Empty"; } // move persistent config data from btif_config file to btif config cache btif_config_cache.Init(std::move(config)); if (!file_source.empty()) { btif_config_cache.SetString(INFO_SECTION, FILE_SOURCE, file_source); } // Cleanup temporary pairings if we have left guest mode if (!is_restricted_mode()) { btif_config_cache.RemovePersistentSectionsWithKey("Restricted"); } // Read or set config file creation timestamp auto time_str = btif_config_cache.GetString(INFO_SECTION, FILE_TIMESTAMP); if (!time_str) { time_t current_time = time(NULL); struct tm* time_created = localtime(¤t_time); strftime(btif_config_time_created, TIME_STRING_LENGTH, TIME_STRING_FORMAT, time_created); btif_config_cache.SetString(INFO_SECTION, FILE_TIMESTAMP, btif_config_time_created); } else { strlcpy(btif_config_time_created, time_str->c_str(), TIME_STRING_LENGTH); } // Read or set metrics 256 bit hashing salt read_or_set_metrics_salt(); // Initialize MetricIdAllocator init_metric_id_allocator(); // TODO(sharvil): use a non-wake alarm for this once we have // API support for it. There's no need to wake the system to // write back to disk. config_timer = alarm_new("btif.config"); if (!config_timer) { LOG_ERROR("%s unable to create alarm.", __func__); goto error; } LOG_EVENT_INT(BT_CONFIG_SOURCE_TAG_NUM, btif_config_source); return future_new_immediate(FUTURE_SUCCESS); error: alarm_free(config_timer); config.reset(); btif_config_cache.Clear(); config_timer = NULL; btif_config_source = NOT_LOADED; return future_new_immediate(FUTURE_FAIL); } static std::unique_ptr btif_config_open(const char* filename) { std::unique_ptr config = config_new(filename); if (!config) return nullptr; if (!config_has_section(*config, "Adapter")) { LOG_ERROR("Config is missing adapter section"); return nullptr; } return config; } static future_t* shut_down(void) { btif_config_flush(); return future_new_immediate(FUTURE_SUCCESS); } static future_t* clean_up(void) { if (bluetooth::shim::is_any_gd_enabled()) { CHECK(bluetooth::shim::is_gd_stack_started_up()); // GD storage module cleanup by itself std::unique_lock lock(config_lock); close_metric_id_allocator(); return future_new_immediate(FUTURE_SUCCESS); } btif_config_flush(); alarm_free(config_timer); config_timer = NULL; std::unique_lock lock(config_lock); get_bluetooth_keystore_interface()->clear_map(); close_metric_id_allocator(); btif_config_cache.Clear(); return future_new_immediate(FUTURE_SUCCESS); } EXPORT_SYMBOL module_t btif_config_module = {.name = BTIF_CONFIG_MODULE, .init = init, .start_up = NULL, .shut_down = shut_down, .clean_up = clean_up}; bool btif_config_exist(const std::string& section, const std::string& key) { if (bluetooth::shim::is_any_gd_enabled()) { CHECK(bluetooth::shim::is_gd_stack_started_up()); return bluetooth::shim::BtifConfigInterface::HasProperty(section, key); } std::unique_lock lock(config_lock); return btif_config_cache.HasKey(section, key); } bool btif_config_get_int(const std::string& section, const std::string& key, int* value) { if (bluetooth::shim::is_any_gd_enabled()) { CHECK(bluetooth::shim::is_gd_stack_started_up()); return bluetooth::shim::BtifConfigInterface::GetInt(section, key, value); } CHECK(value != NULL); std::unique_lock lock(config_lock); auto ret = btif_config_cache.GetInt(section, key); if (!ret) { return false; } *value = *ret; return true; } bool btif_config_set_int(const std::string& section, const std::string& key, int value) { if (bluetooth::shim::is_any_gd_enabled()) { CHECK(bluetooth::shim::is_gd_stack_started_up()); return bluetooth::shim::BtifConfigInterface::SetInt(section, key, value); } std::unique_lock lock(config_lock); btif_config_cache.SetInt(section, key, value); return true; } bool btif_config_get_uint64(const std::string& section, const std::string& key, uint64_t* value) { if (bluetooth::shim::is_any_gd_enabled()) { CHECK(bluetooth::shim::is_gd_stack_started_up()); return bluetooth::shim::BtifConfigInterface::GetUint64(section, key, value); } CHECK(value != NULL); std::unique_lock lock(config_lock); auto ret = btif_config_cache.GetUint64(section, key); if (!ret) { return false; } *value = *ret; return true; } bool btif_config_set_uint64(const std::string& section, const std::string& key, uint64_t value) { if (bluetooth::shim::is_any_gd_enabled()) { CHECK(bluetooth::shim::is_gd_stack_started_up()); return bluetooth::shim::BtifConfigInterface::SetUint64(section, key, value); } std::unique_lock lock(config_lock); btif_config_cache.SetUint64(section, key, value); return true; } /******************************************************************************* * * Function btif_config_get_str * * Description Get the string value associated with a particular section * and key. * * section : The section name (i.e "Adapter") * key : The key name (i.e "Address") * value : A pointer to a buffer where we will store the value * size_bytes : The size of the buffer we have available to * write the value into. Will be updated upon * returning to contain the number of bytes * written. * * Returns True if a value was found, False otherwise. * ******************************************************************************/ bool btif_config_get_str(const std::string& section, const std::string& key, char* value, int* size_bytes) { if (bluetooth::shim::is_any_gd_enabled()) { CHECK(bluetooth::shim::is_gd_stack_started_up()); return bluetooth::shim::BtifConfigInterface::GetStr(section, key, value, size_bytes); } CHECK(value != NULL); CHECK(size_bytes != NULL); { std::unique_lock lock(config_lock); auto stored_value = btif_config_cache.GetString(section, key); if (!stored_value) return false; strlcpy(value, stored_value->c_str(), *size_bytes); } *size_bytes = strlen(value) + 1; return true; } bool btif_config_set_str(const std::string& section, const std::string& key, const std::string& value) { if (bluetooth::shim::is_any_gd_enabled()) { CHECK(bluetooth::shim::is_gd_stack_started_up()); return bluetooth::shim::BtifConfigInterface::SetStr(section, key, value); } std::unique_lock lock(config_lock); btif_config_cache.SetString(section, key, value); return true; } static bool btif_in_encrypt_key_name_list(std::string key) { return std::find(encrypt_key_name_list, encrypt_key_name_list + ENCRYPT_KEY_NAME_LIST_SIZE, key) != (encrypt_key_name_list + ENCRYPT_KEY_NAME_LIST_SIZE); } bool btif_config_get_bin(const std::string& section, const std::string& key, uint8_t* value, size_t* length) { if (bluetooth::shim::is_any_gd_enabled()) { CHECK(bluetooth::shim::is_gd_stack_started_up()); return bluetooth::shim::BtifConfigInterface::GetBin(section, key, value, length); } CHECK(value != NULL); CHECK(length != NULL); std::unique_lock lock(config_lock); const std::string* value_str; auto value_str_from_config = btif_config_cache.GetString(section, key); if (!value_str_from_config) { VLOG(1) << __func__ << ": cannot find string for section " << section << ", key " << key; return false; } bool in_encrypt_key_name_list = btif_in_encrypt_key_name_list(key); bool is_key_encrypted = *value_str_from_config == ENCRYPTED_STR; std::string string; if (!value_str_from_config->empty() && in_encrypt_key_name_list && is_key_encrypted) { string = get_bluetooth_keystore_interface()->get_key(section + "-" + key); value_str = &string; } else { value_str = &value_str_from_config.value(); } size_t value_len = value_str->length(); if ((value_len % 2) != 0 || *length < (value_len / 2)) { LOG(WARNING) << ": value size not divisible by 2, size is " << value_len; return false; } for (size_t i = 0; i < value_len; ++i) if (!isxdigit(value_str->c_str()[i])) { LOG(WARNING) << ": value is not hex digit"; return false; } const char* ptr = value_str->c_str(); for (*length = 0; *ptr; ptr += 2, *length += 1) { sscanf(ptr, "%02hhx", &value[*length]); } if (is_common_criteria_mode()) { if (!value_str_from_config->empty() && in_encrypt_key_name_list && !is_key_encrypted) { get_bluetooth_keystore_interface()->set_encrypt_key_or_remove_key( section + "-" + key, *value_str_from_config); btif_config_cache.SetString(section, key, ENCRYPTED_STR); } } else { if (in_encrypt_key_name_list && is_key_encrypted) { btif_config_cache.SetString(section, key, *value_str); } } return true; } size_t btif_config_get_bin_length(const std::string& section, const std::string& key) { if (bluetooth::shim::is_any_gd_enabled()) { CHECK(bluetooth::shim::is_gd_stack_started_up()); return bluetooth::shim::BtifConfigInterface::GetBinLength(section, key); } std::unique_lock lock(config_lock); auto value_str = btif_config_cache.GetString(section, key); if (!value_str) return 0; size_t value_len = value_str->length(); return ((value_len % 2) != 0) ? 0 : (value_len / 2); } bool btif_config_set_bin(const std::string& section, const std::string& key, const uint8_t* value, size_t length) { if (bluetooth::shim::is_any_gd_enabled()) { CHECK(bluetooth::shim::is_gd_stack_started_up()); return bluetooth::shim::BtifConfigInterface::SetBin(section, key, value, length); } const char* lookup = "0123456789abcdef"; if (length > 0) CHECK(value != NULL); size_t max_value = ((size_t)-1); if (((max_value - 1) / 2) < length) { LOG(ERROR) << __func__ << ": length too long"; return false; } char* str = (char*)osi_calloc(length * 2 + 1); for (size_t i = 0; i < length; ++i) { str[(i * 2) + 0] = lookup[(value[i] >> 4) & 0x0F]; str[(i * 2) + 1] = lookup[value[i] & 0x0F]; } std::string value_str; if ((length > 0) && is_common_criteria_mode() && btif_in_encrypt_key_name_list(key)) { get_bluetooth_keystore_interface()->set_encrypt_key_or_remove_key( section + "-" + key, str); value_str = ENCRYPTED_STR; } else { value_str = str; } { std::unique_lock lock(config_lock); btif_config_cache.SetString(section, key, value_str); } osi_free(str); return true; } std::vector btif_config_get_paired_devices() { std::vector names; if (bluetooth::shim::is_any_gd_enabled()) { CHECK(bluetooth::shim::is_gd_stack_started_up()); names = bluetooth::shim::BtifConfigInterface::GetPersistentDevices(); } else { std::unique_lock lock(config_lock); names = btif_config_cache.GetPersistentSectionNames(); } std::vector result; result.reserve(names.size()); for (const auto& name : names) { RawAddress addr = {}; // Gather up known devices from configuration section names if (RawAddress::FromString(name, addr)) { result.emplace_back(addr); } } return result; } bool btif_config_remove(const std::string& section, const std::string& key) { if (bluetooth::shim::is_any_gd_enabled()) { CHECK(bluetooth::shim::is_gd_stack_started_up()); return bluetooth::shim::BtifConfigInterface::RemoveProperty(section, key); } if (is_common_criteria_mode() && btif_in_encrypt_key_name_list(key)) { get_bluetooth_keystore_interface()->set_encrypt_key_or_remove_key( section + "-" + key, ""); } std::unique_lock lock(config_lock); return btif_config_cache.RemoveKey(section, key); } void btif_config_save(void) { if (bluetooth::shim::is_any_gd_enabled()) { CHECK(bluetooth::shim::is_gd_stack_started_up()); bluetooth::shim::BtifConfigInterface::Save(); return; } CHECK(config_timer != NULL); alarm_set(config_timer, CONFIG_SETTLE_PERIOD_MS, timer_config_save_cb, NULL); } void btif_config_flush(void) { if (bluetooth::shim::is_any_gd_enabled()) { CHECK(bluetooth::shim::is_gd_stack_started_up()); bluetooth::shim::BtifConfigInterface::Flush(); return; } CHECK(config_timer != NULL); alarm_cancel(config_timer); btif_config_write(0, NULL); } bool btif_config_clear(void) { if (bluetooth::shim::is_any_gd_enabled()) { CHECK(bluetooth::shim::is_gd_stack_started_up()); bluetooth::shim::BtifConfigInterface::Clear(); bluetooth::shim::BtifConfigInterface::Save(); return true; } CHECK(config_timer != NULL); alarm_cancel(config_timer); std::unique_lock lock(config_lock); btif_config_cache.Clear(); bool ret = config_save(btif_config_cache.PersistentSectionCopy(), CONFIG_FILE_PATH); btif_config_source = RESET; return ret; } static void timer_config_save_cb(UNUSED_ATTR void* data) { // Moving file I/O to btif context instead of timer callback because // it usually takes a lot of time to be completed, introducing // delays during A2DP playback causing blips or choppiness. btif_transfer_context(btif_config_write, 0, NULL, 0, NULL); } static void btif_config_write(UNUSED_ATTR uint16_t event, UNUSED_ATTR char* p_param) { CHECK(config_timer != NULL); std::unique_lock lock(config_lock); rename(CONFIG_FILE_PATH, CONFIG_BACKUP_PATH); config_save(btif_config_cache.PersistentSectionCopy(), CONFIG_FILE_PATH); if (is_common_criteria_mode()) { get_bluetooth_keystore_interface()->set_encrypt_key_or_remove_key( CONFIG_FILE_PREFIX, CONFIG_FILE_HASH); } } void btif_debug_config_dump(int fd) { dprintf(fd, "\nBluetooth Config:\n"); dprintf(fd, " Config Source: "); switch (btif_config_source) { case NOT_LOADED: dprintf(fd, "Not loaded\n"); break; case ORIGINAL: dprintf(fd, "Original file\n"); break; case BACKUP: dprintf(fd, "Backup file\n"); break; case LEGACY: dprintf(fd, "Legacy file\n"); break; case NEW_FILE: dprintf(fd, "New file\n"); break; case RESET: dprintf(fd, "Reset file\n"); break; } std::optional file_source; if (bluetooth::shim::is_gd_stack_started_up()) { CHECK(bluetooth::shim::is_any_gd_enabled()); file_source = bluetooth::shim::BtifConfigInterface::GetStr(INFO_SECTION, FILE_SOURCE); } else { file_source = btif_config_cache.GetString(INFO_SECTION, FILE_SOURCE); } if (!file_source) { file_source.emplace("Original"); } auto devices = btif_config_cache.GetPersistentSectionNames(); dprintf(fd, " Devices loaded: %zu\n", devices.size()); dprintf(fd, " File created/tagged: %s\n", btif_config_time_created); dprintf(fd, " File source: %s\n", file_source->c_str()); } static bool is_factory_reset(void) { char factory_reset[PROPERTY_VALUE_MAX] = {0}; osi_property_get("persist.bluetooth.factoryreset", factory_reset, "false"); return strncmp(factory_reset, "true", 4) == 0; } static void delete_config_files(void) { remove(CONFIG_FILE_PATH); remove(CONFIG_BACKUP_PATH); osi_property_set("persist.bluetooth.factoryreset", "false"); }