1 /******************************************************************************
3 * Copyright (C) 2014 Google, Inc.
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at:
9 * http://www.apache.org/licenses/LICENSE-2.0
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
17 ******************************************************************************/
19 #define LOG_TAG "bt_btif_config"
21 #include "btif_config.h"
31 #include "btcore/include/bdaddr.h"
32 #include "btcore/include/module.h"
33 #include "btif_common.h"
34 #include "btif_config.h"
35 #include "btif_config_transcode.h"
36 #include "btif_util.h"
37 #include "osi/include/alarm.h"
38 #include "osi/include/allocator.h"
39 #include "osi/include/compat.h"
40 #include "osi/include/config.h"
41 #include "osi/include/log.h"
42 #include "osi/include/osi.h"
44 // TODO(armansito): Find a better way than searching by a hardcoded path.
45 #if defined(OS_GENERIC)
46 static const char *CONFIG_FILE_PATH = "bt_config.conf";
47 #else // !defined(OS_GENERIC)
48 static const char *CONFIG_FILE_PATH = "/data/misc/bluedroid/bt_config.conf";
49 #endif // defined(OS_GENERIC)
50 static const char *LEGACY_CONFIG_FILE_PATH = "/data/misc/bluedroid/bt_config.xml";
51 static const period_ms_t CONFIG_SETTLE_PERIOD_MS = 3000;
53 static void timer_config_save_cb(void *data);
54 static void btif_config_write(UINT16 event, char *p_param);
55 static void btif_config_devcache_cleanup(void);
57 // TODO(zachoverflow): Move these two functions out, because they are too specific for this file
58 // {grumpy-cat/no, monty-python/you-make-me-sad}
59 bool btif_get_device_type(const BD_ADDR bd_addr, int *p_device_type)
61 if (p_device_type == NULL)
65 bdcpy(bda.address, bd_addr);
68 bdaddr_to_string(&bda, bd_addr_str, sizeof(bd_addr_str));
70 if (!btif_config_get_int(bd_addr_str, "DevType", p_device_type))
73 LOG_DEBUG(LOG_TAG, "%s: Device [%s] type %d", __FUNCTION__, bd_addr_str, *p_device_type);
77 bool btif_get_address_type(const BD_ADDR bd_addr, int *p_addr_type)
79 if (p_addr_type == NULL)
83 bdcpy(bda.address, bd_addr);
86 bdaddr_to_string(&bda, bd_addr_str, sizeof(bd_addr_str));
88 if (!btif_config_get_int(bd_addr_str, "AddrType", p_addr_type))
91 LOG_DEBUG(LOG_TAG, "%s: Device [%s] address type %d", __FUNCTION__, bd_addr_str, *p_addr_type);
95 static pthread_mutex_t lock; // protects operations on |config|.
96 static config_t *config;
97 static alarm_t *config_timer;
99 // Module lifecycle functions
101 static future_t *init(void) {
102 pthread_mutex_init(&lock, NULL);
103 config = config_new(CONFIG_FILE_PATH);
105 LOG_WARN(LOG_TAG, "%s unable to load config file; attempting to transcode legacy file.", __func__);
106 config = btif_config_transcode(LEGACY_CONFIG_FILE_PATH);
108 LOG_WARN(LOG_TAG, "%s unable to transcode legacy file, starting unconfigured.", __func__);
109 config = config_new_empty();
111 LOG_ERROR(LOG_TAG, "%s unable to allocate a config object.", __func__);
116 if (config_save(config, CONFIG_FILE_PATH))
117 unlink(LEGACY_CONFIG_FILE_PATH);
120 btif_config_devcache_cleanup();
122 // TODO(sharvil): use a non-wake alarm for this once we have
123 // API support for it. There's no need to wake the system to
124 // write back to disk.
125 config_timer = alarm_new("btif.config");
127 LOG_ERROR(LOG_TAG, "%s unable to create alarm.", __func__);
131 return future_new_immediate(FUTURE_SUCCESS);
134 alarm_free(config_timer);
136 pthread_mutex_destroy(&lock);
139 return future_new_immediate(FUTURE_FAIL);
142 static future_t *shut_down(void) {
144 return future_new_immediate(FUTURE_SUCCESS);
147 static future_t *clean_up(void) {
150 alarm_free(config_timer);
152 pthread_mutex_destroy(&lock);
155 return future_new_immediate(FUTURE_SUCCESS);
158 EXPORT_SYMBOL const module_t btif_config_module = {
159 .name = BTIF_CONFIG_MODULE,
162 .shut_down = shut_down,
163 .clean_up = clean_up,
169 bool btif_config_has_section(const char *section) {
170 assert(config != NULL);
171 assert(section != NULL);
173 pthread_mutex_lock(&lock);
174 bool ret = config_has_section(config, section);
175 pthread_mutex_unlock(&lock);
180 bool btif_config_exist(const char *section, const char *key) {
181 assert(config != NULL);
182 assert(section != NULL);
185 pthread_mutex_lock(&lock);
186 bool ret = config_has_key(config, section, key);
187 pthread_mutex_unlock(&lock);
192 bool btif_config_get_int(const char *section, const char *key, int *value) {
193 assert(config != NULL);
194 assert(section != NULL);
196 assert(value != NULL);
198 pthread_mutex_lock(&lock);
199 bool ret = config_has_key(config, section, key);
201 *value = config_get_int(config, section, key, *value);
202 pthread_mutex_unlock(&lock);
207 bool btif_config_set_int(const char *section, const char *key, int value) {
208 assert(config != NULL);
209 assert(section != NULL);
212 pthread_mutex_lock(&lock);
213 config_set_int(config, section, key, value);
214 pthread_mutex_unlock(&lock);
219 bool btif_config_get_str(const char *section, const char *key, char *value, int *size_bytes) {
220 assert(config != NULL);
221 assert(section != NULL);
223 assert(value != NULL);
224 assert(size_bytes != NULL);
226 pthread_mutex_lock(&lock);
227 const char *stored_value = config_get_string(config, section, key, NULL);
228 pthread_mutex_unlock(&lock);
233 strlcpy(value, stored_value, *size_bytes);
234 *size_bytes = strlen(value) + 1;
239 bool btif_config_set_str(const char *section, const char *key, const char *value) {
240 assert(config != NULL);
241 assert(section != NULL);
243 assert(value != NULL);
245 pthread_mutex_lock(&lock);
246 config_set_string(config, section, key, value);
247 pthread_mutex_unlock(&lock);
252 bool btif_config_get_bin(const char *section, const char *key, uint8_t *value, size_t *length) {
253 assert(config != NULL);
254 assert(section != NULL);
256 assert(value != NULL);
257 assert(length != NULL);
259 pthread_mutex_lock(&lock);
260 const char *value_str = config_get_string(config, section, key, NULL);
261 pthread_mutex_unlock(&lock);
266 size_t value_len = strlen(value_str);
267 if ((value_len % 2) != 0 || *length < (value_len / 2))
270 for (size_t i = 0; i < value_len; ++i)
271 if (!isxdigit(value_str[i]))
274 for (*length = 0; *value_str; value_str += 2, *length += 1)
275 sscanf(value_str, "%02hhx", &value[*length]);
280 size_t btif_config_get_bin_length(const char *section, const char *key) {
281 assert(config != NULL);
282 assert(section != NULL);
285 pthread_mutex_lock(&lock);
286 const char *value_str = config_get_string(config, section, key, NULL);
287 pthread_mutex_unlock(&lock);
292 size_t value_len = strlen(value_str);
293 return ((value_len % 2) != 0) ? 0 : (value_len / 2);
296 bool btif_config_set_bin(const char *section, const char *key, const uint8_t *value, size_t length) {
297 const char *lookup = "0123456789abcdef";
299 assert(config != NULL);
300 assert(section != NULL);
304 assert(value != NULL);
306 char *str = (char *)osi_calloc(length * 2 + 1);
310 for (size_t i = 0; i < length; ++i) {
311 str[(i * 2) + 0] = lookup[(value[i] >> 4) & 0x0F];
312 str[(i * 2) + 1] = lookup[value[i] & 0x0F];
315 pthread_mutex_lock(&lock);
316 config_set_string(config, section, key, str);
317 pthread_mutex_unlock(&lock);
323 const btif_config_section_iter_t *btif_config_section_begin(void) {
324 assert(config != NULL);
325 return (const btif_config_section_iter_t *)config_section_begin(config);
328 const btif_config_section_iter_t *btif_config_section_end(void) {
329 assert(config != NULL);
330 return (const btif_config_section_iter_t *)config_section_end(config);
333 const btif_config_section_iter_t *btif_config_section_next(const btif_config_section_iter_t *section) {
334 assert(config != NULL);
335 assert(section != NULL);
336 return (const btif_config_section_iter_t *)config_section_next((const config_section_node_t *)section);
339 const char *btif_config_section_name(const btif_config_section_iter_t *section) {
340 assert(config != NULL);
341 assert(section != NULL);
342 return config_section_name((const config_section_node_t *)section);
345 bool btif_config_remove(const char *section, const char *key) {
346 assert(config != NULL);
347 assert(section != NULL);
350 pthread_mutex_lock(&lock);
351 bool ret = config_remove_key(config, section, key);
352 pthread_mutex_unlock(&lock);
357 void btif_config_save(void) {
358 assert(config_timer != NULL);
359 assert(config != NULL);
361 alarm_set(config_timer, CONFIG_SETTLE_PERIOD_MS, timer_config_save_cb, NULL);
364 void btif_config_flush(void) {
365 assert(config != NULL);
366 assert(config_timer != NULL);
368 alarm_cancel(config_timer);
369 btif_config_write(0, NULL);
371 pthread_mutex_lock(&lock);
372 config_save(config, CONFIG_FILE_PATH);
373 pthread_mutex_unlock(&lock);
376 int btif_config_clear(void){
377 assert(config != NULL);
378 assert(config_timer != NULL);
380 alarm_cancel(config_timer);
382 pthread_mutex_lock(&lock);
385 config = config_new_empty();
386 if (config == NULL) {
387 pthread_mutex_unlock(&lock);
391 int ret = config_save(config, CONFIG_FILE_PATH);
392 pthread_mutex_unlock(&lock);
396 static void timer_config_save_cb(UNUSED_ATTR void *data) {
397 // Moving file I/O to btif context instead of timer callback because
398 // it usually takes a lot of time to be completed, introducing
399 // delays during A2DP playback causing blips or choppiness.
400 btif_transfer_context(btif_config_write, 0, NULL, 0, NULL);
403 static void btif_config_write(UNUSED_ATTR UINT16 event, UNUSED_ATTR char *p_param) {
404 assert(config != NULL);
405 assert(config_timer != NULL);
407 btif_config_devcache_cleanup();
409 pthread_mutex_lock(&lock);
410 config_save(config, CONFIG_FILE_PATH);
411 pthread_mutex_unlock(&lock);
414 static void btif_config_devcache_cleanup(void) {
415 assert(config != NULL);
417 // The config accumulates cached information about remote
418 // devices during regular inquiry scans. We remove some of these
419 // so the cache doesn't grow indefinitely.
420 // We don't remove information about bonded devices (which have link keys).
421 static const size_t ADDRS_MAX = 512;
422 size_t total_addrs = 0;
424 pthread_mutex_lock(&lock);
425 const config_section_node_t *snode = config_section_begin(config);
426 while (snode != config_section_end(config)) {
427 const char *section = config_section_name(snode);
428 if (string_is_bdaddr(section)) {
431 if ((total_addrs > ADDRS_MAX) &&
432 !config_has_key(config, section, "LinkKey") &&
433 !config_has_key(config, section, "LE_KEY_PENC") &&
434 !config_has_key(config, section, "LE_KEY_PID") &&
435 !config_has_key(config, section, "LE_KEY_PCSRK") &&
436 !config_has_key(config, section, "LE_KEY_LENC") &&
437 !config_has_key(config, section, "LE_KEY_LCSRK")) {
438 snode = config_section_next(snode);
439 config_remove_section(config, section);
443 snode = config_section_next(snode);
445 pthread_mutex_unlock(&lock);