1. clean up bluetooth storage log prints; 2. reduce maximum link key storage size 3. modify so that the link key information of the latest connected device is stored at first
445 lines
11 KiB
C
445 lines
11 KiB
C
/******************************************************************************
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*
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* Copyright (C) 2014 Google, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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******************************************************************************/
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#define LOG_TAG "bt_btif_config"
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#include <ctype.h>
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#include <stdio.h>
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#include <string.h>
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#include "bt_defs.h"
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#include "bt_trace.h"
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#include "alarm.h"
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#include "allocator.h"
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#include "bdaddr.h"
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#include "btif_config.h"
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#include "btif_util.h"
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#include "config.h"
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#include "osi.h"
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#include "bt_types.h"
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static const char *CONFIG_FILE_PATH = "bt_config.conf";
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static const period_ms_t CONFIG_SETTLE_PERIOD_MS = 3000;
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static void timer_config_save(void *data);
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// TODO(zachoverflow): Move these two functions out, because they are too specific for this file
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// {grumpy-cat/no, monty-python/you-make-me-sad}
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bool btif_get_device_type(const BD_ADDR bd_addr, int *p_device_type)
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{
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if (p_device_type == NULL) {
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return FALSE;
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}
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bt_bdaddr_t bda;
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bdcpy(bda.address, bd_addr);
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bdstr_t bd_addr_str;
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bdaddr_to_string(&bda, bd_addr_str, sizeof(bd_addr_str));
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if (!btif_config_get_int(bd_addr_str, "DevType", p_device_type)) {
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return FALSE;
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}
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LOG_DEBUG("%s: Device [%s] type %d\n", __FUNCTION__, bd_addr_str, *p_device_type);
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return TRUE;
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}
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bool btif_get_address_type(const BD_ADDR bd_addr, int *p_addr_type)
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{
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if (p_addr_type == NULL) {
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return FALSE;
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}
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bt_bdaddr_t bda;
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bdcpy(bda.address, bd_addr);
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bdstr_t bd_addr_str;
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bdaddr_to_string(&bda, bd_addr_str, sizeof(bd_addr_str));
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if (!btif_config_get_int(bd_addr_str, "AddrType", p_addr_type)) {
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return FALSE;
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}
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LOG_DEBUG("%s: Device [%s] address type %d\n", __FUNCTION__, bd_addr_str, *p_addr_type);
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return TRUE;
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}
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static pthread_mutex_t lock; // protects operations on |config|.
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static config_t *config;
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static osi_alarm_t *alarm_timer;
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// Module lifecycle functions
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bool btif_config_init(void)
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{
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pthread_mutex_init(&lock, NULL);
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config = config_new(CONFIG_FILE_PATH);
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if (!config) {
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LOG_WARN("%s unable to load config file; starting unconfigured.\n", __func__);
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config = config_new_empty();
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if (!config) {
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LOG_ERROR("%s unable to allocate a config object.\n", __func__);
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goto error;
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}
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}
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if (config_save(config, CONFIG_FILE_PATH)) {
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// unlink(LEGACY_CONFIG_FILE_PATH);
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}
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// TODO(sharvil): use a non-wake alarm for this once we have
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// API support for it. There's no need to wake the system to
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// write back to disk.
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alarm_timer = osi_alarm_new("btif_config", timer_config_save, NULL, CONFIG_SETTLE_PERIOD_MS, false);
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if (!alarm_timer) {
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LOG_ERROR("%s unable to create alarm.\n", __func__);
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goto error;
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}
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return true;
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error:;
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osi_alarm_free(alarm_timer);
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config_free(config);
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pthread_mutex_destroy(&lock);
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alarm_timer = NULL;
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config = NULL;
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LOG_ERROR("%s failed\n", __func__);
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return false;
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}
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bool btif_config_shut_down(void)
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{
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btif_config_flush();
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return true;
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}
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bool btif_config_clean_up(void)
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{
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btif_config_flush();
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osi_alarm_free(alarm_timer);
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config_free(config);
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pthread_mutex_destroy(&lock);
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alarm_timer = NULL;
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config = NULL;
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return true;
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}
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bool btif_config_has_section(const char *section)
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{
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assert(config != NULL);
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assert(section != NULL);
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pthread_mutex_lock(&lock);
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bool ret = config_has_section(config, section);
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pthread_mutex_unlock(&lock);
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return ret;
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}
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bool btif_config_exist(const char *section, const char *key)
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{
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assert(config != NULL);
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assert(section != NULL);
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assert(key != NULL);
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pthread_mutex_lock(&lock);
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bool ret = config_has_key(config, section, key);
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pthread_mutex_unlock(&lock);
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return ret;
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}
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bool btif_config_get_int(const char *section, const char *key, int *value)
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{
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assert(config != NULL);
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assert(section != NULL);
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assert(key != NULL);
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assert(value != NULL);
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pthread_mutex_lock(&lock);
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bool ret = config_has_key(config, section, key);
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if (ret) {
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*value = config_get_int(config, section, key, *value);
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}
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pthread_mutex_unlock(&lock);
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return ret;
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}
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bool btif_config_set_int(const char *section, const char *key, int value)
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{
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assert(config != NULL);
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assert(section != NULL);
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assert(key != NULL);
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pthread_mutex_lock(&lock);
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config_set_int(config, section, key, value);
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pthread_mutex_unlock(&lock);
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return true;
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}
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bool btif_config_get_str(const char *section, const char *key, char *value, int *size_bytes)
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{
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assert(config != NULL);
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assert(section != NULL);
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assert(key != NULL);
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assert(value != NULL);
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assert(size_bytes != NULL);
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pthread_mutex_lock(&lock);
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const char *stored_value = config_get_string(config, section, key, NULL);
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pthread_mutex_unlock(&lock);
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if (!stored_value) {
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return false;
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}
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strlcpy(value, stored_value, *size_bytes);
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*size_bytes = strlen(value) + 1;
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return true;
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}
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bool btif_config_set_str(const char *section, const char *key, const char *value)
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{
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assert(config != NULL);
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assert(section != NULL);
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assert(key != NULL);
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assert(value != NULL);
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pthread_mutex_lock(&lock);
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config_set_string(config, section, key, value, false);
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pthread_mutex_unlock(&lock);
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return true;
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}
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bool btif_config_get_bin(const char *section, const char *key, uint8_t *value, size_t *length)
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{
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assert(config != NULL);
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assert(section != NULL);
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assert(key != NULL);
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assert(value != NULL);
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assert(length != NULL);
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pthread_mutex_lock(&lock);
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const char *value_str = config_get_string(config, section, key, NULL);
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pthread_mutex_unlock(&lock);
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if (!value_str) {
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return false;
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}
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size_t value_len = strlen(value_str);
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if ((value_len % 2) != 0 || *length < (value_len / 2)) {
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return false;
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}
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for (size_t i = 0; i < value_len; ++i)
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if (!isxdigit((unsigned char)value_str[i])) {
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return false;
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}
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for (*length = 0; *value_str; value_str += 2, *length += 1) {
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unsigned int val;
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sscanf(value_str, "%02x", &val);
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value[*length] = (uint8_t)(val);
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}
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return true;
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}
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size_t btif_config_get_bin_length(const char *section, const char *key)
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{
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assert(config != NULL);
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assert(section != NULL);
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assert(key != NULL);
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pthread_mutex_lock(&lock);
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const char *value_str = config_get_string(config, section, key, NULL);
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pthread_mutex_unlock(&lock);
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if (!value_str) {
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return 0;
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}
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size_t value_len = strlen(value_str);
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return ((value_len % 2) != 0) ? 0 : (value_len / 2);
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}
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bool btif_config_set_bin(const char *section, const char *key, const uint8_t *value, size_t length)
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{
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const char *lookup = "0123456789abcdef";
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assert(config != NULL);
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assert(section != NULL);
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assert(key != NULL);
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if (length > 0) {
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assert(value != NULL);
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}
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char *str = (char *)osi_calloc(length * 2 + 1);
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if (!str) {
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return false;
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}
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for (size_t i = 0; i < length; ++i) {
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str[(i * 2) + 0] = lookup[(value[i] >> 4) & 0x0F];
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str[(i * 2) + 1] = lookup[value[i] & 0x0F];
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}
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pthread_mutex_lock(&lock);
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config_set_string(config, section, key, str, false);
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pthread_mutex_unlock(&lock);
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osi_free(str);
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return true;
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}
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const btif_config_section_iter_t *btif_config_section_begin(void)
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{
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assert(config != NULL);
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return (const btif_config_section_iter_t *)config_section_begin(config);
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}
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const btif_config_section_iter_t *btif_config_section_end(void)
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{
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assert(config != NULL);
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return (const btif_config_section_iter_t *)config_section_end(config);
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}
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const btif_config_section_iter_t *btif_config_section_next(const btif_config_section_iter_t *section)
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{
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assert(config != NULL);
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assert(section != NULL);
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return (const btif_config_section_iter_t *)config_section_next((const config_section_node_t *)section);
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}
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const char *btif_config_section_name(const btif_config_section_iter_t *section)
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{
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assert(config != NULL);
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assert(section != NULL);
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return config_section_name((const config_section_node_t *)section);
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}
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bool btif_config_remove(const char *section, const char *key)
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{
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assert(config != NULL);
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assert(section != NULL);
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assert(key != NULL);
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pthread_mutex_lock(&lock);
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bool ret = config_remove_key(config, section, key);
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pthread_mutex_unlock(&lock);
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return ret;
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}
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void btif_config_save(void)
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{
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assert(alarm_timer != NULL);
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assert(config != NULL);
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osi_alarm_set(alarm_timer, CONFIG_SETTLE_PERIOD_MS);
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}
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void btif_config_flush(void)
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{
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assert(config != NULL);
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assert(alarm_timer != NULL);
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osi_alarm_cancel(alarm_timer);
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pthread_mutex_lock(&lock);
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config_save(config, CONFIG_FILE_PATH);
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pthread_mutex_unlock(&lock);
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}
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int btif_config_clear(void)
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{
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assert(config != NULL);
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assert(alarm_timer != NULL);
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osi_alarm_cancel(alarm_timer);
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pthread_mutex_lock(&lock);
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config_free(config);
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config = config_new_empty();
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if (config == NULL) {
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pthread_mutex_unlock(&lock);
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return false;
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}
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int ret = config_save(config, CONFIG_FILE_PATH);
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pthread_mutex_unlock(&lock);
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return ret;
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}
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static void timer_config_save(UNUSED_ATTR void *data)
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{
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assert(config != NULL);
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assert(alarm_timer != NULL);
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// Garbage collection process: the config file accumulates
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// cached information about remote devices during regular
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// inquiry scans. We remove some of these junk entries
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// so the file doesn't grow indefinitely. We have to take care
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// to make sure we don't remove information about bonded
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// devices (hence the check for link keys).
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static const size_t CACHE_MAX = 256;
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const char *keys[CACHE_MAX];
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size_t num_keys = 0;
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size_t total_candidates = 0;
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pthread_mutex_lock(&lock);
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for (const config_section_node_t *snode = config_section_begin(config); snode != config_section_end(config); snode = config_section_next(snode)) {
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const char *section = config_section_name(snode);
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if (!string_is_bdaddr(section)) {
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continue;
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}
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if (config_has_key(config, section, "LinkKey") ||
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config_has_key(config, section, "LE_KEY_PENC") ||
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config_has_key(config, section, "LE_KEY_PID") ||
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config_has_key(config, section, "LE_KEY_PCSRK") ||
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config_has_key(config, section, "LE_KEY_LENC") ||
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config_has_key(config, section, "LE_KEY_LCSRK")) {
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continue;
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}
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if (num_keys < CACHE_MAX) {
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keys[num_keys++] = section;
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}
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++total_candidates;
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}
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if (total_candidates > CACHE_MAX * 2)
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while (num_keys > 0) {
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config_remove_section(config, keys[--num_keys]);
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}
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config_save(config, CONFIG_FILE_PATH);
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pthread_mutex_unlock(&lock);
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}
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