| /****************************************************************************** |
| * |
| * Copyright (C) 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 <base/logging.h> |
| #include <ctype.h> |
| #include <stdio.h> |
| #include <string.h> |
| #include <time.h> |
| #include <unistd.h> |
| #include <string> |
| |
| #include <mutex> |
| |
| #include "bt_types.h" |
| #include "btcore/include/bdaddr.h" |
| #include "btcore/include/module.h" |
| #include "btif_api.h" |
| #include "btif_common.h" |
| #include "btif_config_transcode.h" |
| #include "btif_util.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" |
| |
| #define BT_CONFIG_SOURCE_TAG_NUM 1010001 |
| |
| #define INFO_SECTION "Info" |
| #define FILE_TIMESTAMP "TimeCreated" |
| #define FILE_SOURCE "FileSource" |
| #define TIME_STRING_LENGTH sizeof("YYYY-MM-DD HH:MM:SS") |
| static const char* TIME_STRING_FORMAT = "%Y-%m-%d %H:%M:%S"; |
| |
| // 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 period_ms_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 void btif_config_remove_unpaired(config_t* config); |
| static void btif_config_remove_restricted(config_t* config); |
| static config_t* btif_config_open(const char* filename); |
| |
| static enum ConfigSource { |
| NOT_LOADED, |
| ORIGINAL, |
| BACKUP, |
| LEGACY, |
| NEW_FILE, |
| RESET |
| } btif_config_source = NOT_LOADED; |
| |
| static int btif_config_devices_loaded = -1; |
| static char btif_config_time_created[TIME_STRING_LENGTH]; |
| |
| // 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 BD_ADDR bd_addr, int* p_device_type) { |
| if (p_device_type == NULL) return false; |
| |
| bt_bdaddr_t bda; |
| bdcpy(bda.address, bd_addr); |
| |
| bdstr_t bd_addr_str; |
| bdaddr_to_string(&bda, bd_addr_str, sizeof(bd_addr_str)); |
| |
| if (!btif_config_get_int(bd_addr_str, "DevType", p_device_type)) return false; |
| |
| LOG_DEBUG(LOG_TAG, "%s: Device [%s] type %d", __func__, bd_addr_str, |
| *p_device_type); |
| return true; |
| } |
| |
| bool btif_get_address_type(const BD_ADDR bd_addr, int* p_addr_type) { |
| if (p_addr_type == NULL) return false; |
| |
| bt_bdaddr_t bda; |
| bdcpy(bda.address, bd_addr); |
| |
| bdstr_t bd_addr_str; |
| bdaddr_to_string(&bda, bd_addr_str, sizeof(bd_addr_str)); |
| |
| if (!btif_config_get_int(bd_addr_str, "AddrType", p_addr_type)) return false; |
| |
| LOG_DEBUG(LOG_TAG, "%s: Device [%s] address type %d", __func__, bd_addr_str, |
| *p_addr_type); |
| return true; |
| } |
| |
| static std::mutex config_lock; // protects operations on |config|. |
| static config_t* config; |
| static alarm_t* config_timer; |
| |
| // Module lifecycle functions |
| |
| static future_t* init(void) { |
| std::unique_lock<std::mutex> lock(config_lock); |
| |
| if (is_factory_reset()) delete_config_files(); |
| |
| std::string file_source; |
| |
| config = btif_config_open(CONFIG_FILE_PATH); |
| btif_config_source = ORIGINAL; |
| if (!config) { |
| LOG_WARN(LOG_TAG, "%s unable to load config file: %s; using backup.", |
| __func__, CONFIG_FILE_PATH); |
| config = btif_config_open(CONFIG_BACKUP_PATH); |
| btif_config_source = BACKUP; |
| file_source = "Backup"; |
| } |
| if (!config) { |
| LOG_WARN(LOG_TAG, |
| "%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(LOG_TAG, |
| "%s unable to transcode legacy file; creating empty config.", |
| __func__); |
| config = config_new_empty(); |
| btif_config_source = NEW_FILE; |
| file_source = "Empty"; |
| } |
| |
| if (!file_source.empty()) |
| config_set_string(config, INFO_SECTION, FILE_SOURCE, file_source.c_str()); |
| |
| if (!config) { |
| LOG_ERROR(LOG_TAG, "%s unable to allocate a config object.", __func__); |
| goto error; |
| } |
| |
| btif_config_remove_unpaired(config); |
| |
| // Cleanup temporary pairings if we have left guest mode |
| if (!is_restricted_mode()) btif_config_remove_restricted(config); |
| |
| // Read or set config file creation timestamp |
| const char* time_str; |
| time_str = config_get_string(config, INFO_SECTION, FILE_TIMESTAMP, NULL); |
| if (time_str != NULL) { |
| strlcpy(btif_config_time_created, time_str, TIME_STRING_LENGTH); |
| } else { |
| 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); |
| config_set_string(config, INFO_SECTION, FILE_TIMESTAMP, |
| btif_config_time_created); |
| } |
| |
| // 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(LOG_TAG, "%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_free(config); |
| config_timer = NULL; |
| config = NULL; |
| btif_config_source = NOT_LOADED; |
| return future_new_immediate(FUTURE_FAIL); |
| } |
| |
| static config_t* btif_config_open(const char* filename) { |
| config_t* config = config_new(filename); |
| if (!config) return NULL; |
| |
| if (!config_has_section(config, "Adapter")) { |
| LOG_ERROR(LOG_TAG, "Config is missing adapter section"); |
| config_free(config); |
| return NULL; |
| } |
| |
| return config; |
| } |
| |
| static future_t* shut_down(void) { |
| btif_config_flush(); |
| return future_new_immediate(FUTURE_SUCCESS); |
| } |
| |
| static future_t* clean_up(void) { |
| btif_config_flush(); |
| |
| alarm_free(config_timer); |
| config_free(config); |
| config_timer = NULL; |
| config = NULL; |
| 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_has_section(const char* section) { |
| CHECK(config != NULL); |
| CHECK(section != NULL); |
| |
| std::unique_lock<std::mutex> lock(config_lock); |
| return config_has_section(config, section); |
| } |
| |
| bool btif_config_exist(const char* section, const char* key) { |
| CHECK(config != NULL); |
| CHECK(section != NULL); |
| CHECK(key != NULL); |
| |
| std::unique_lock<std::mutex> lock(config_lock); |
| return config_has_key(config, section, key); |
| } |
| |
| bool btif_config_get_int(const char* section, const char* key, int* value) { |
| CHECK(config != NULL); |
| CHECK(section != NULL); |
| CHECK(key != NULL); |
| CHECK(value != NULL); |
| |
| std::unique_lock<std::mutex> lock(config_lock); |
| bool ret = config_has_key(config, section, key); |
| if (ret) *value = config_get_int(config, section, key, *value); |
| |
| return ret; |
| } |
| |
| bool btif_config_set_int(const char* section, const char* key, int value) { |
| CHECK(config != NULL); |
| CHECK(section != NULL); |
| CHECK(key != NULL); |
| |
| std::unique_lock<std::mutex> lock(config_lock); |
| config_set_int(config, section, key, value); |
| |
| return true; |
| } |
| |
| bool btif_config_get_str(const char* section, const char* key, char* value, |
| int* size_bytes) { |
| CHECK(config != NULL); |
| CHECK(section != NULL); |
| CHECK(key != NULL); |
| CHECK(value != NULL); |
| CHECK(size_bytes != NULL); |
| |
| { |
| std::unique_lock<std::mutex> lock(config_lock); |
| const char* stored_value = config_get_string(config, section, key, NULL); |
| if (!stored_value) return false; |
| strlcpy(value, stored_value, *size_bytes); |
| } |
| |
| *size_bytes = strlen(value) + 1; |
| return true; |
| } |
| |
| bool btif_config_set_str(const char* section, const char* key, |
| const char* value) { |
| CHECK(config != NULL); |
| CHECK(section != NULL); |
| CHECK(key != NULL); |
| CHECK(value != NULL); |
| |
| std::unique_lock<std::mutex> lock(config_lock); |
| config_set_string(config, section, key, value); |
| return true; |
| } |
| |
| bool btif_config_get_bin(const char* section, const char* key, uint8_t* value, |
| size_t* length) { |
| CHECK(config != NULL); |
| CHECK(section != NULL); |
| CHECK(key != NULL); |
| CHECK(value != NULL); |
| CHECK(length != NULL); |
| |
| std::unique_lock<std::mutex> lock(config_lock); |
| const char* value_str = config_get_string(config, section, key, NULL); |
| |
| if (!value_str) return false; |
| |
| size_t value_len = strlen(value_str); |
| if ((value_len % 2) != 0 || *length < (value_len / 2)) return false; |
| |
| for (size_t i = 0; i < value_len; ++i) |
| if (!isxdigit(value_str[i])) return false; |
| |
| for (*length = 0; *value_str; value_str += 2, *length += 1) |
| sscanf(value_str, "%02hhx", &value[*length]); |
| |
| return true; |
| } |
| |
| size_t btif_config_get_bin_length(const char* section, const char* key) { |
| CHECK(config != NULL); |
| CHECK(section != NULL); |
| CHECK(key != NULL); |
| |
| std::unique_lock<std::mutex> lock(config_lock); |
| const char* value_str = config_get_string(config, section, key, NULL); |
| if (!value_str) return 0; |
| |
| size_t value_len = strlen(value_str); |
| return ((value_len % 2) != 0) ? 0 : (value_len / 2); |
| } |
| |
| bool btif_config_set_bin(const char* section, const char* key, |
| const uint8_t* value, size_t length) { |
| const char* lookup = "0123456789abcdef"; |
| |
| CHECK(config != NULL); |
| CHECK(section != NULL); |
| CHECK(key != NULL); |
| |
| if (length > 0) CHECK(value != NULL); |
| |
| 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::unique_lock<std::mutex> lock(config_lock); |
| config_set_string(config, section, key, str); |
| } |
| |
| osi_free(str); |
| return true; |
| } |
| |
| const btif_config_section_iter_t* btif_config_section_begin(void) { |
| CHECK(config != NULL); |
| return (const btif_config_section_iter_t*)config_section_begin(config); |
| } |
| |
| const btif_config_section_iter_t* btif_config_section_end(void) { |
| CHECK(config != NULL); |
| return (const btif_config_section_iter_t*)config_section_end(config); |
| } |
| |
| const btif_config_section_iter_t* btif_config_section_next( |
| const btif_config_section_iter_t* section) { |
| CHECK(config != NULL); |
| CHECK(section != NULL); |
| return (const btif_config_section_iter_t*)config_section_next( |
| (const config_section_node_t*)section); |
| } |
| |
| const char* btif_config_section_name( |
| const btif_config_section_iter_t* section) { |
| CHECK(config != NULL); |
| CHECK(section != NULL); |
| return config_section_name((const config_section_node_t*)section); |
| } |
| |
| bool btif_config_remove(const char* section, const char* key) { |
| CHECK(config != NULL); |
| CHECK(section != NULL); |
| CHECK(key != NULL); |
| |
| std::unique_lock<std::mutex> lock(config_lock); |
| return config_remove_key(config, section, key); |
| } |
| |
| void btif_config_save(void) { |
| CHECK(config != NULL); |
| CHECK(config_timer != NULL); |
| |
| alarm_set(config_timer, CONFIG_SETTLE_PERIOD_MS, timer_config_save_cb, NULL); |
| } |
| |
| void btif_config_flush(void) { |
| CHECK(config != NULL); |
| CHECK(config_timer != NULL); |
| |
| alarm_cancel(config_timer); |
| btif_config_write(0, NULL); |
| } |
| |
| bool btif_config_clear(void) { |
| CHECK(config != NULL); |
| CHECK(config_timer != NULL); |
| |
| alarm_cancel(config_timer); |
| |
| std::unique_lock<std::mutex> lock(config_lock); |
| config_free(config); |
| |
| config = config_new_empty(); |
| if (config == NULL) return false; |
| |
| bool ret = config_save(config, 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 != NULL); |
| CHECK(config_timer != NULL); |
| |
| std::unique_lock<std::mutex> lock(config_lock); |
| rename(CONFIG_FILE_PATH, CONFIG_BACKUP_PATH); |
| config_t* config_paired = config_new_clone(config); |
| btif_config_remove_unpaired(config_paired); |
| config_save(config_paired, CONFIG_FILE_PATH); |
| config_free(config_paired); |
| } |
| |
| static void btif_config_remove_unpaired(config_t* conf) { |
| CHECK(conf != NULL); |
| int paired_devices = 0; |
| |
| // The paired config used to carry information about |
| // discovered devices during regular inquiry scans. |
| // We remove these now and cache them in memory instead. |
| const config_section_node_t* snode = config_section_begin(conf); |
| while (snode != config_section_end(conf)) { |
| const char* section = config_section_name(snode); |
| if (string_is_bdaddr(section)) { |
| if (!config_has_key(conf, section, "LinkKey") && |
| !config_has_key(conf, section, "LE_KEY_PENC") && |
| !config_has_key(conf, section, "LE_KEY_PID") && |
| !config_has_key(conf, section, "LE_KEY_PCSRK") && |
| !config_has_key(conf, section, "LE_KEY_LENC") && |
| !config_has_key(conf, section, "LE_KEY_LCSRK")) { |
| snode = config_section_next(snode); |
| config_remove_section(conf, section); |
| continue; |
| } |
| paired_devices++; |
| } |
| snode = config_section_next(snode); |
| } |
| |
| // should only happen once, at initial load time |
| if (btif_config_devices_loaded == -1) |
| btif_config_devices_loaded = paired_devices; |
| } |
| |
| 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; |
| } |
| |
| dprintf(fd, " Devices loaded: %d\n", btif_config_devices_loaded); |
| dprintf(fd, " File created/tagged: %s\n", btif_config_time_created); |
| dprintf(fd, " File source: %s\n", |
| config_get_string(config, INFO_SECTION, FILE_SOURCE, "Original")); |
| } |
| |
| static void btif_config_remove_restricted(config_t* config) { |
| CHECK(config != NULL); |
| |
| const config_section_node_t* snode = config_section_begin(config); |
| while (snode != config_section_end(config)) { |
| const char* section = config_section_name(snode); |
| if (string_is_bdaddr(section) && |
| config_has_key(config, section, "Restricted")) { |
| BTIF_TRACE_DEBUG("%s: Removing restricted device %s", __func__, section); |
| config_remove_section(config, section); |
| } |
| snode = config_section_next(snode); |
| } |
| } |
| |
| 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"); |
| } |