bta_gattc_cache.cc revision da3ebfd175b223b9f070b143e66ffffb8ea58532 
1/******************************************************************************
2 *
3 *  Copyright (C) 2003-2012 Broadcom Corporation
4 *
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:
8 *
9 *  http://www.apache.org/licenses/LICENSE-2.0
10 *
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.
16 *
17 ******************************************************************************/
18
19/******************************************************************************
20 *
21 *  This file contains the GATT client discovery procedures and cache
22 *  related functions.
23 *
24 ******************************************************************************/
25
26#define LOG_TAG "bt_bta_gattc"
27
28#include "bt_target.h"
29
30#include <errno.h>
31#include <stdio.h>
32#include <string.h>
33#include <unistd.h>
34
35#include "bt_common.h"
36#include "bta_gattc_int.h"
37#include "bta_sys.h"
38#include "btm_api.h"
39#include "btm_ble_api.h"
40#include "btm_int.h"
41#include "osi/include/log.h"
42#include "osi/include/osi.h"
43#include "sdp_api.h"
44#include "sdpdefs.h"
45#include "utl.h"
46
47using bluetooth::Uuid;
48using base::StringPrintf;
49
50static void bta_gattc_cache_write(const RawAddress& server_bda,
51                                  uint16_t num_attr, tBTA_GATTC_NV_ATTR* attr);
52static void bta_gattc_char_dscpt_disc_cmpl(uint16_t conn_id,
53                                           tBTA_GATTC_SERV* p_srvc_cb);
54static tGATT_STATUS bta_gattc_sdp_service_disc(uint16_t conn_id,
55                                               tBTA_GATTC_SERV* p_server_cb);
56const tBTA_GATTC_DESCRIPTOR* bta_gattc_get_descriptor_srcb(
57    tBTA_GATTC_SERV* p_srcb, uint16_t handle);
58tBTA_GATTC_CHARACTERISTIC* bta_gattc_get_characteristic_srcb(
59    tBTA_GATTC_SERV* p_srcb, uint16_t handle);
60
61#define BTA_GATT_SDP_DB_SIZE 4096
62
63#define GATT_CACHE_PREFIX "/data/misc/bluetooth/gatt_cache_"
64#define GATT_CACHE_VERSION 2
65
66static void bta_gattc_generate_cache_file_name(char* buffer, size_t buffer_len,
67                                               const RawAddress& bda) {
68  snprintf(buffer, buffer_len, "%s%02x%02x%02x%02x%02x%02x", GATT_CACHE_PREFIX,
69           bda.address[0], bda.address[1], bda.address[2], bda.address[3],
70           bda.address[4], bda.address[5]);
71}
72
73/*****************************************************************************
74 *  Constants and data types
75 ****************************************************************************/
76
77typedef struct {
78  tSDP_DISCOVERY_DB* p_sdp_db;
79  uint16_t sdp_conn_id;
80} tBTA_GATTC_CB_DATA;
81
82#if (BTA_GATT_DEBUG == TRUE)
83/* utility functions */
84
85/* debug function to display the server cache */
86static void bta_gattc_display_cache_server(
87    const std::list<tBTA_GATTC_SERVICE>& cache) {
88  LOG(ERROR) << "<================Start Server Cache =============>";
89
90  for (const tBTA_GATTC_SERVICE& service : cache) {
91    LOG(ERROR) << "Service: s_handle=" << loghex(service.s_handle)
92               << ", e_handle=" << loghex(service.e_handle)
93               << ", inst=" << loghex(service.handle)
94               << ", uuid=" << service.uuid;
95
96    if (service.characteristics.empty()) {
97      LOG(ERROR) << "\t No characteristics";
98      continue;
99    }
100
101    for (const tBTA_GATTC_CHARACTERISTIC& c : service.characteristics) {
102      LOG(ERROR) << "\t Characteristic handle=" << loghex(c.handle)
103                 << ", uuid=" << c.uuid << ", prop=" << loghex(c.properties);
104
105      if (c.descriptors.empty()) {
106        LOG(ERROR) << "\t\t No descriptors";
107        continue;
108      }
109
110      for (const tBTA_GATTC_DESCRIPTOR& d : c.descriptors) {
111        LOG(ERROR) << "\t\t Descriptor handle=" << loghex(d.handle)
112                   << ", uuid=" << d.uuid;
113      }
114    }
115  }
116
117  LOG(ERROR) << "<================End Server Cache =============>";
118  LOG(ERROR) << " ";
119}
120
121/*******************************************************************************
122 *
123 * Function         bta_gattc_display_explore_record
124 *
125 * Description      debug function to display the exploration list
126 *
127 * Returns          none.
128 *
129 ******************************************************************************/
130static void bta_gattc_display_explore_record(tBTA_GATTC_ATTR_REC* p_rec,
131                                             uint8_t num_rec) {
132  uint8_t i;
133  tBTA_GATTC_ATTR_REC* pp = p_rec;
134
135  LOG(ERROR) << "<================Start Explore Queue =============>";
136  for (i = 0; i < num_rec; i++, pp++) {
137    LOG(ERROR) << StringPrintf(
138        "\t rec[%d] uuid[%s] s_handle[%d] e_handle[%d] is_primary[%d]", i + 1,
139        pp->uuid.ToString().c_str(), pp->s_handle, pp->e_handle,
140        pp->is_primary);
141  }
142  LOG(ERROR) << "<================ End Explore Queue =============>";
143  LOG(ERROR) << " ";
144}
145#endif /* BTA_GATT_DEBUG == TRUE */
146
147/*******************************************************************************
148 *
149 * Function         bta_gattc_init_cache
150 *
151 * Description      Initialize the database cache and discovery related
152 *                  resources.
153 *
154 * Returns          status
155 *
156 ******************************************************************************/
157tGATT_STATUS bta_gattc_init_cache(tBTA_GATTC_SERV* p_srvc_cb) {
158  p_srvc_cb->srvc_cache.clear();
159
160  osi_free(p_srvc_cb->p_srvc_list);
161  p_srvc_cb->p_srvc_list =
162      (tBTA_GATTC_ATTR_REC*)osi_malloc(BTA_GATTC_ATTR_LIST_SIZE);
163  p_srvc_cb->total_srvc = 0;
164  p_srvc_cb->cur_srvc_idx = 0;
165  p_srvc_cb->cur_char_idx = 0;
166  p_srvc_cb->next_avail_idx = 0;
167
168  return GATT_SUCCESS;
169}
170
171tBTA_GATTC_SERVICE* bta_gattc_find_matching_service(
172    std::list<tBTA_GATTC_SERVICE>& services, uint16_t handle) {
173  for (tBTA_GATTC_SERVICE& service : services) {
174    if (handle >= service.s_handle && handle <= service.e_handle)
175      return &service;
176  }
177
178  return nullptr;
179}
180
181/** Add a service into GATT database */
182static void add_service_to_gatt_db(std::list<tBTA_GATTC_SERVICE>& gatt_db,
183                                   uint16_t s_handle, uint16_t e_handle,
184                                   const Uuid& uuid, bool is_primary) {
185#if (BTA_GATT_DEBUG == TRUE)
186  VLOG(1) << "Add a service into Service";
187#endif
188
189  gatt_db.emplace_back(tBTA_GATTC_SERVICE{
190      .s_handle = s_handle,
191      .e_handle = e_handle,
192      .is_primary = is_primary,
193      .uuid = uuid,
194      .handle = s_handle,
195  });
196}
197
198/** Add a characteristic into GATT database */
199static void add_characteristic_to_gatt_db(
200    std::list<tBTA_GATTC_SERVICE>& gatt_db, uint16_t attr_handle,
201    uint16_t value_handle, const Uuid& uuid, uint8_t property) {
202#if (BTA_GATT_DEBUG == TRUE)
203  VLOG(1) << __func__
204          << ": Add a characteristic into service. handle:" << +value_handle
205          << " uuid:" << uuid << " property=0x" << std::hex << +property;
206#endif
207
208  tBTA_GATTC_SERVICE* service =
209      bta_gattc_find_matching_service(gatt_db, attr_handle);
210  if (!service) {
211    LOG(ERROR) << "Illegal action to add char/descr/incl srvc for non-existing "
212                  "service!";
213    return;
214  }
215
216  /* TODO(jpawlowski): We should use attribute handle, not value handle to refer
217     to characteristic.
218     This is just a temporary workaround.
219  */
220  if (service->e_handle < value_handle) service->e_handle = value_handle;
221
222  service->characteristics.emplace_back(
223      tBTA_GATTC_CHARACTERISTIC{.handle = value_handle,
224                                .properties = property,
225                                .uuid = uuid,
226                                .service = service});
227  return;
228}
229
230/* Add an descriptor into database cache buffer */
231static void add_descriptor_to_gatt_db(std::list<tBTA_GATTC_SERVICE>& gatt_db,
232                                      uint16_t handle, const Uuid& uuid) {
233#if (BTA_GATT_DEBUG == TRUE)
234  VLOG(1) << __func__ << ": add descriptor, handle=" << loghex(handle)
235          << ", uuid=" << uuid;
236#endif
237
238  tBTA_GATTC_SERVICE* service =
239      bta_gattc_find_matching_service(gatt_db, handle);
240  if (!service) {
241    LOG(ERROR) << "Illegal action to add descriptor for non-existing service!";
242    return;
243  }
244
245  if (service->characteristics.empty()) {
246    LOG(ERROR) << __func__
247               << ": Illegal action to add descriptor before adding a "
248                  "characteristic!";
249    return;
250  }
251
252  tBTA_GATTC_CHARACTERISTIC& char_node = service->characteristics.back();
253  char_node.descriptors.emplace_back(tBTA_GATTC_DESCRIPTOR{
254      .handle = handle, .uuid = uuid, .characteristic = &char_node,
255  });
256}
257
258/* Add an attribute into database cache buffer */
259static void add_incl_srvc_to_gatt_db(std::list<tBTA_GATTC_SERVICE>& gatt_db,
260                                     uint16_t handle, const Uuid& uuid,
261                                     uint16_t incl_srvc_s_handle) {
262#if (BTA_GATT_DEBUG == TRUE)
263  VLOG(1) << __func__ << ": add included service, handle=" << loghex(handle)
264          << ", uuid=" << uuid;
265#endif
266
267  tBTA_GATTC_SERVICE* service =
268      bta_gattc_find_matching_service(gatt_db, handle);
269  if (!service) {
270    LOG(ERROR) << "Illegal action to add incl srvc for non-existing service!";
271    return;
272  }
273
274  tBTA_GATTC_SERVICE* included_service =
275      bta_gattc_find_matching_service(gatt_db, incl_srvc_s_handle);
276  if (!included_service) {
277    LOG(ERROR) << __func__
278               << ": Illegal action to add non-existing included service!";
279    return;
280  }
281
282  service->included_svc.emplace_back(tBTA_GATTC_INCLUDED_SVC{
283      .handle = handle,
284      .uuid = uuid,
285      .owning_service = service,
286      .included_service = included_service,
287  });
288}
289
290/*******************************************************************************
291 *
292 * Function         bta_gattc_get_disc_range
293 *
294 * Description      get discovery stating and ending handle range.
295 *
296 * Returns          None.
297 *
298 ******************************************************************************/
299void bta_gattc_get_disc_range(tBTA_GATTC_SERV* p_srvc_cb, uint16_t* p_s_hdl,
300                              uint16_t* p_e_hdl, bool is_srvc) {
301  tBTA_GATTC_ATTR_REC* p_rec = NULL;
302
303  if (is_srvc) {
304    p_rec = p_srvc_cb->p_srvc_list + p_srvc_cb->cur_srvc_idx;
305    *p_s_hdl = p_rec->s_handle;
306  } else {
307    p_rec = p_srvc_cb->p_srvc_list + p_srvc_cb->cur_char_idx;
308    *p_s_hdl = p_rec->s_handle + 1;
309  }
310
311  *p_e_hdl = p_rec->e_handle;
312#if (BTA_GATT_DEBUG == TRUE)
313  VLOG(1) << StringPrintf("discover range [%d ~ %d]", p_rec->s_handle,
314                          p_rec->e_handle);
315#endif
316  return;
317}
318
319/** Start primary service discovery */
320tGATT_STATUS bta_gattc_discover_pri_service(uint16_t conn_id,
321                                            tBTA_GATTC_SERV* p_server_cb,
322                                            uint8_t disc_type) {
323  tBTA_GATTC_CLCB* p_clcb = bta_gattc_find_clcb_by_conn_id(conn_id);
324  if (!p_clcb) return GATT_ERROR;
325
326  if (p_clcb->transport == BTA_TRANSPORT_LE)
327    return bta_gattc_discover_procedure(conn_id, p_server_cb, disc_type);
328
329  return bta_gattc_sdp_service_disc(conn_id, p_server_cb);
330}
331
332/*******************************************************************************
333 *
334 * Function         bta_gattc_discover_procedure
335 *
336 * Description      Start a particular type of discovery procedure on server.
337 *
338 * Returns          status of the operation.
339 *
340 ******************************************************************************/
341tGATT_STATUS bta_gattc_discover_procedure(uint16_t conn_id,
342                                          tBTA_GATTC_SERV* p_server_cb,
343                                          uint8_t disc_type) {
344  tGATT_DISC_PARAM param;
345  bool is_service = true;
346
347  memset(&param, 0, sizeof(tGATT_DISC_PARAM));
348
349  if (disc_type == GATT_DISC_SRVC_ALL || disc_type == GATT_DISC_SRVC_BY_UUID) {
350    param.s_handle = 1;
351    param.e_handle = 0xFFFF;
352  } else {
353    if (disc_type == GATT_DISC_CHAR_DSCPT) is_service = false;
354
355    bta_gattc_get_disc_range(p_server_cb, &param.s_handle, &param.e_handle,
356                             is_service);
357
358    if (param.s_handle > param.e_handle) {
359      return GATT_ERROR;
360    }
361  }
362  return GATTC_Discover(conn_id, disc_type, &param);
363}
364
365/** Start discovery for characteristic descriptor */
366void bta_gattc_start_disc_char_dscp(uint16_t conn_id,
367                                    tBTA_GATTC_SERV* p_srvc_cb) {
368  VLOG(1) << "starting discover characteristics descriptor";
369
370  if (bta_gattc_discover_procedure(conn_id, p_srvc_cb, GATT_DISC_CHAR_DSCPT) !=
371      0)
372    bta_gattc_char_dscpt_disc_cmpl(conn_id, p_srvc_cb);
373}
374
375/** process the service discovery complete event */
376static void bta_gattc_explore_srvc(uint16_t conn_id,
377                                   tBTA_GATTC_SERV* p_srvc_cb) {
378  tBTA_GATTC_CLCB* p_clcb = bta_gattc_find_clcb_by_conn_id(conn_id);
379  if (!p_clcb) {
380    LOG(ERROR) << "unknown connection ID";
381    return;
382  }
383
384  /* start expore a service if there is service not been explored */
385  if (p_srvc_cb->cur_srvc_idx < p_srvc_cb->total_srvc) {
386    tBTA_GATTC_ATTR_REC* p_rec =
387        p_srvc_cb->p_srvc_list + p_srvc_cb->cur_srvc_idx;
388    VLOG(1) << "Start service discovery: srvc_idx:" << +p_srvc_cb->cur_srvc_idx;
389
390    p_srvc_cb->cur_char_idx = p_srvc_cb->next_avail_idx = p_srvc_cb->total_srvc;
391
392    /* add the first service into cache */
393    add_service_to_gatt_db(p_srvc_cb->srvc_cache, p_rec->s_handle,
394                           p_rec->e_handle, p_rec->uuid, p_rec->is_primary);
395
396    /* start discovering included services */
397    bta_gattc_discover_procedure(conn_id, p_srvc_cb, GATT_DISC_INC_SRVC);
398    return;
399  }
400
401  /* no service found at all, the end of server discovery*/
402  LOG_WARN(LOG_TAG, "%s no more services found", __func__);
403
404#if (BTA_GATT_DEBUG == TRUE)
405  bta_gattc_display_cache_server(p_srvc_cb->srvc_cache);
406#endif
407  /* save cache to NV */
408  p_clcb->p_srcb->state = BTA_GATTC_SERV_SAVE;
409
410  if (btm_sec_is_a_bonded_dev(p_srvc_cb->server_bda)) {
411    bta_gattc_cache_save(p_clcb->p_srcb, p_clcb->bta_conn_id);
412  }
413
414  bta_gattc_reset_discover_st(p_clcb->p_srcb, GATT_SUCCESS);
415}
416
417/*******************************************************************************
418 *
419 * Function         bta_gattc_char_disc_cmpl
420 *
421 * Description      process the characteristic discovery complete event
422 *
423 * Returns          status
424 *
425 ******************************************************************************/
426static void bta_gattc_char_disc_cmpl(uint16_t conn_id,
427                                     tBTA_GATTC_SERV* p_srvc_cb) {
428  tBTA_GATTC_ATTR_REC* p_rec = p_srvc_cb->p_srvc_list + p_srvc_cb->cur_char_idx;
429
430  /* if there are characteristic needs to be explored */
431  if (p_srvc_cb->total_char > 0) {
432    /* add the first characteristic into cache */
433    add_characteristic_to_gatt_db(p_srvc_cb->srvc_cache,
434                                  p_rec->char_decl_handle, p_rec->s_handle,
435                                  p_rec->uuid, p_rec->property);
436
437    /* start discoverying characteristic descriptor , if failed, disc for next
438     * char*/
439    bta_gattc_start_disc_char_dscp(conn_id, p_srvc_cb);
440  } else /* otherwise start with next service */
441  {
442    p_srvc_cb->cur_srvc_idx++;
443
444    bta_gattc_explore_srvc(conn_id, p_srvc_cb);
445  }
446}
447/*******************************************************************************
448 *
449 * Function         bta_gattc_char_dscpt_disc_cmpl
450 *
451 * Description      process the char descriptor discovery complete event
452 *
453 * Returns          status
454 *
455 ******************************************************************************/
456static void bta_gattc_char_dscpt_disc_cmpl(uint16_t conn_id,
457                                           tBTA_GATTC_SERV* p_srvc_cb) {
458  tBTA_GATTC_ATTR_REC* p_rec = NULL;
459
460  if (--p_srvc_cb->total_char > 0) {
461    p_rec = p_srvc_cb->p_srvc_list + (++p_srvc_cb->cur_char_idx);
462    /* add the next characteristic into cache */
463    add_characteristic_to_gatt_db(p_srvc_cb->srvc_cache,
464                                  p_rec->char_decl_handle, p_rec->s_handle,
465                                  p_rec->uuid, p_rec->property);
466
467    /* start discoverying next characteristic for char descriptor */
468    bta_gattc_start_disc_char_dscp(conn_id, p_srvc_cb);
469  } else
470  /* all characteristic has been explored, start with next service if any */
471  {
472#if (BTA_GATT_DEBUG == TRUE)
473    LOG(ERROR) << "all char has been explored";
474#endif
475    p_srvc_cb->cur_srvc_idx++;
476    bta_gattc_explore_srvc(conn_id, p_srvc_cb);
477  }
478}
479
480static bool bta_gattc_srvc_in_list(tBTA_GATTC_SERV* p_srvc_cb,
481                                   uint16_t s_handle, uint16_t e_handle, Uuid) {
482  if (!GATT_HANDLE_IS_VALID(s_handle) || !GATT_HANDLE_IS_VALID(e_handle)) {
483    LOG(ERROR) << "invalid included service s_handle=" << loghex(s_handle)
484               << ", e_handle=" << loghex(e_handle);
485    return true;
486  }
487
488  for (uint8_t i = 0; i < p_srvc_cb->next_avail_idx; i++) {
489    tBTA_GATTC_ATTR_REC* p_rec = p_srvc_cb->p_srvc_list + i;
490
491    /* new service should not have any overlap with other service */
492    if (p_rec->s_handle == s_handle || p_rec->e_handle == e_handle) {
493      return true;
494    }
495  }
496
497  return false;
498}
499
500/** Add a service into explore pending list */
501static void bta_gattc_add_srvc_to_list(tBTA_GATTC_SERV* p_srvc_cb,
502                                       uint16_t s_handle, uint16_t e_handle,
503                                       const Uuid& uuid, bool is_primary) {
504  if (!p_srvc_cb->p_srvc_list ||
505      p_srvc_cb->next_avail_idx >= BTA_GATTC_MAX_CACHE_CHAR) {
506    /* allocate bigger buffer ?? */
507    LOG(ERROR) << "service not added, no resources or wrong state";
508    return;
509  }
510
511  tBTA_GATTC_ATTR_REC* p_rec =
512      p_srvc_cb->p_srvc_list + p_srvc_cb->next_avail_idx;
513
514  VLOG(1) << __func__ << "handle:" << loghex(s_handle)
515          << " service type=" << uuid;
516
517  p_rec->s_handle = s_handle;
518  p_rec->e_handle = e_handle;
519  p_rec->is_primary = is_primary;
520  p_rec->uuid = uuid;
521
522  p_srvc_cb->total_srvc++;
523  p_srvc_cb->next_avail_idx++;
524}
525
526/** Add a characteristic into explore pending list */
527static void bta_gattc_add_char_to_list(tBTA_GATTC_SERV* p_srvc_cb,
528                                       uint16_t decl_handle,
529                                       uint16_t value_handle, const Uuid& uuid,
530                                       uint8_t property) {
531  if (!p_srvc_cb->p_srvc_list) {
532    LOG(ERROR) << "No service available, unexpected char discovery result";
533    return;
534  }
535
536  if (p_srvc_cb->next_avail_idx >= BTA_GATTC_MAX_CACHE_CHAR) {
537    LOG(ERROR) << "char not added, no resources";
538    /* allocate bigger buffer ?? */
539    return;
540  }
541
542  tBTA_GATTC_ATTR_REC* p_rec =
543      p_srvc_cb->p_srvc_list + p_srvc_cb->next_avail_idx;
544
545  p_srvc_cb->total_char++;
546
547  p_rec->s_handle = value_handle;
548  p_rec->char_decl_handle = decl_handle;
549  p_rec->property = property;
550  p_rec->e_handle =
551      (p_srvc_cb->p_srvc_list + p_srvc_cb->cur_srvc_idx)->e_handle;
552  p_rec->uuid = uuid;
553
554  /* update the endind handle of pervious characteristic if available */
555  if (p_srvc_cb->total_char > 1) {
556    p_rec -= 1;
557    p_rec->e_handle = decl_handle - 1;
558  }
559  p_srvc_cb->next_avail_idx++;
560}
561
562/*******************************************************************************
563 *
564 * Function         bta_gattc_sdp_callback
565 *
566 * Description      Process the discovery result from sdp
567 *
568 * Returns          void
569 *
570 ******************************************************************************/
571void bta_gattc_sdp_callback(uint16_t sdp_status, void* user_data) {
572  tSDP_PROTOCOL_ELEM pe;
573  tBTA_GATTC_CB_DATA* cb_data = (tBTA_GATTC_CB_DATA*)user_data;
574  tBTA_GATTC_SERV* p_srvc_cb = bta_gattc_find_scb_by_cid(cb_data->sdp_conn_id);
575
576  if (((sdp_status == SDP_SUCCESS) || (sdp_status == SDP_DB_FULL)) &&
577      p_srvc_cb != NULL) {
578    tSDP_DISC_REC* p_sdp_rec = NULL;
579    do {
580      /* find a service record, report it */
581      p_sdp_rec = SDP_FindServiceInDb(cb_data->p_sdp_db, 0, p_sdp_rec);
582      if (p_sdp_rec) {
583        Uuid service_uuid;
584        if (SDP_FindServiceUUIDInRec(p_sdp_rec, &service_uuid)) {
585          if (SDP_FindProtocolListElemInRec(p_sdp_rec, UUID_PROTOCOL_ATT,
586                                            &pe)) {
587            uint16_t start_handle = (uint16_t)pe.params[0];
588            uint16_t end_handle = (uint16_t)pe.params[1];
589
590#if (BTA_GATT_DEBUG == TRUE)
591            VLOG(1) << "Found ATT service uuid=" << service_uuid
592                    << ", s_handle=" << loghex(start_handle)
593                    << ", e_handle=" << loghex(end_handle);
594#endif
595
596            if (GATT_HANDLE_IS_VALID(start_handle) &&
597                GATT_HANDLE_IS_VALID(end_handle) && p_srvc_cb != NULL) {
598              /* discover services result, add services into a service list */
599              bta_gattc_add_srvc_to_list(p_srvc_cb, start_handle, end_handle,
600                                         service_uuid, true);
601            } else {
602              LOG(ERROR) << "invalid start_handle=" << loghex(start_handle)
603                         << ", end_handle=" << loghex(end_handle);
604            }
605          }
606        }
607      }
608    } while (p_sdp_rec);
609  }
610
611  if (p_srvc_cb != NULL) {
612    /* start discover primary service */
613    bta_gattc_explore_srvc(cb_data->sdp_conn_id, p_srvc_cb);
614  } else {
615    LOG(ERROR) << "GATT service discovery is done on unknown connection";
616  }
617
618  /* both were allocated in bta_gattc_sdp_service_disc */
619  osi_free(cb_data->p_sdp_db);
620  osi_free(cb_data);
621}
622/*******************************************************************************
623 *
624 * Function         bta_gattc_sdp_service_disc
625 *
626 * Description      Start DSP Service Discovert
627 *
628 * Returns          void
629 *
630 ******************************************************************************/
631static tGATT_STATUS bta_gattc_sdp_service_disc(uint16_t conn_id,
632                                               tBTA_GATTC_SERV* p_server_cb) {
633  uint16_t num_attrs = 2;
634  uint16_t attr_list[2];
635
636  /*
637   * On success, cb_data will be freed inside bta_gattc_sdp_callback,
638   * otherwise it will be freed within this function.
639   */
640  tBTA_GATTC_CB_DATA* cb_data =
641      (tBTA_GATTC_CB_DATA*)osi_malloc(sizeof(tBTA_GATTC_CB_DATA));
642
643  cb_data->p_sdp_db = (tSDP_DISCOVERY_DB*)osi_malloc(BTA_GATT_SDP_DB_SIZE);
644  attr_list[0] = ATTR_ID_SERVICE_CLASS_ID_LIST;
645  attr_list[1] = ATTR_ID_PROTOCOL_DESC_LIST;
646
647  Uuid uuid = Uuid::From16Bit(UUID_PROTOCOL_ATT);
648  SDP_InitDiscoveryDb(cb_data->p_sdp_db, BTA_GATT_SDP_DB_SIZE, 1, &uuid,
649                      num_attrs, attr_list);
650
651  if (!SDP_ServiceSearchAttributeRequest2(p_server_cb->server_bda,
652                                          cb_data->p_sdp_db,
653                                          &bta_gattc_sdp_callback, cb_data)) {
654    osi_free(cb_data->p_sdp_db);
655    osi_free(cb_data);
656    return GATT_ERROR;
657  }
658
659  cb_data->sdp_conn_id = conn_id;
660  return GATT_SUCCESS;
661}
662
663/** callback function to GATT client stack */
664void bta_gattc_disc_res_cback(uint16_t conn_id, tGATT_DISC_TYPE disc_type,
665                              tGATT_DISC_RES* p_data) {
666  tBTA_GATTC_CLCB* p_clcb = bta_gattc_find_clcb_by_conn_id(conn_id);
667  tBTA_GATTC_SERV* p_srvc_cb = bta_gattc_find_scb_by_cid(conn_id);
668
669  if (!p_srvc_cb || !p_clcb || p_clcb->state != BTA_GATTC_DISCOVER_ST) return;
670
671  switch (disc_type) {
672    case GATT_DISC_SRVC_ALL:
673      /* discover services result, add services into a service list */
674      bta_gattc_add_srvc_to_list(p_srvc_cb, p_data->handle,
675                                 p_data->value.group_value.e_handle,
676                                 p_data->value.group_value.service_type, true);
677
678      break;
679    case GATT_DISC_SRVC_BY_UUID:
680      bta_gattc_add_srvc_to_list(p_srvc_cb, p_data->handle,
681                                 p_data->value.group_value.e_handle,
682                                 p_data->value.group_value.service_type, true);
683      break;
684
685    case GATT_DISC_INC_SRVC:
686      /* add included service into service list if it's secondary or it never
687         showed up in the primary service search */
688      if (!bta_gattc_srvc_in_list(p_srvc_cb,
689                                  p_data->value.incl_service.s_handle,
690                                  p_data->value.incl_service.e_handle,
691                                  p_data->value.incl_service.service_type)) {
692        bta_gattc_add_srvc_to_list(
693            p_srvc_cb, p_data->value.incl_service.s_handle,
694            p_data->value.incl_service.e_handle,
695            p_data->value.incl_service.service_type, false);
696      }
697
698      /* add into database */
699      add_incl_srvc_to_gatt_db(p_srvc_cb->srvc_cache, p_data->handle,
700                               p_data->value.incl_service.service_type,
701                               p_data->value.incl_service.s_handle);
702      break;
703
704    case GATT_DISC_CHAR:
705      /* add char value into database */
706      bta_gattc_add_char_to_list(p_srvc_cb, p_data->handle,
707                                 p_data->value.dclr_value.val_handle,
708                                 p_data->value.dclr_value.char_uuid,
709                                 p_data->value.dclr_value.char_prop);
710      break;
711
712    case GATT_DISC_CHAR_DSCPT:
713      add_descriptor_to_gatt_db(p_srvc_cb->srvc_cache, p_data->handle,
714                                p_data->type);
715      break;
716  }
717}
718
719void bta_gattc_disc_cmpl_cback(uint16_t conn_id, tGATT_DISC_TYPE disc_type,
720                               tGATT_STATUS status) {
721  tBTA_GATTC_CLCB* p_clcb = bta_gattc_find_clcb_by_conn_id(conn_id);
722
723  if (p_clcb && (status != GATT_SUCCESS || p_clcb->status != GATT_SUCCESS)) {
724    if (status == GATT_SUCCESS) p_clcb->status = status;
725    bta_gattc_sm_execute(p_clcb, BTA_GATTC_DISCOVER_CMPL_EVT, NULL);
726    return;
727  }
728
729  tBTA_GATTC_SERV* p_srvc_cb = bta_gattc_find_scb_by_cid(conn_id);
730  if (!p_srvc_cb) return;
731
732  switch (disc_type) {
733    case GATT_DISC_SRVC_ALL:
734    case GATT_DISC_SRVC_BY_UUID:
735#if (BTA_GATT_DEBUG == TRUE)
736      bta_gattc_display_explore_record(p_srvc_cb->p_srvc_list,
737                                       p_srvc_cb->next_avail_idx);
738#endif
739      bta_gattc_explore_srvc(conn_id, p_srvc_cb);
740      break;
741
742    case GATT_DISC_INC_SRVC:
743      /* start discoverying characteristic */
744      p_srvc_cb->cur_char_idx = p_srvc_cb->total_srvc;
745      p_srvc_cb->total_char = 0;
746      bta_gattc_discover_procedure(conn_id, p_srvc_cb, GATT_DISC_CHAR);
747      break;
748
749    case GATT_DISC_CHAR:
750#if (BTA_GATT_DEBUG == TRUE)
751      bta_gattc_display_explore_record(p_srvc_cb->p_srvc_list,
752                                       p_srvc_cb->next_avail_idx);
753#endif
754      bta_gattc_char_disc_cmpl(conn_id, p_srvc_cb);
755      break;
756
757    case GATT_DISC_CHAR_DSCPT:
758      bta_gattc_char_dscpt_disc_cmpl(conn_id, p_srvc_cb);
759      break;
760  }
761}
762
763/*******************************************************************************
764 *
765 * Function         bta_gattc_search_service
766 *
767 * Description      search local cache for matching service record.
768 *
769 * Returns          false if map can not be found.
770 *
771 ******************************************************************************/
772void bta_gattc_search_service(tBTA_GATTC_CLCB* p_clcb, Uuid* p_uuid) {
773  for (const tBTA_GATTC_SERVICE& service : p_clcb->p_srcb->srvc_cache) {
774    if (p_uuid && *p_uuid != service.uuid) continue;
775
776#if (BTA_GATT_DEBUG == TRUE)
777    VLOG(1) << __func__ << "found service " << service.uuid
778            << ", inst:" << +service.handle << " handle:" << +service.s_handle;
779#endif
780    if (!p_clcb->p_rcb->p_cback) continue;
781
782    tBTA_GATTC cb_data;
783    memset(&cb_data, 0, sizeof(tBTA_GATTC));
784    cb_data.srvc_res.conn_id = p_clcb->bta_conn_id;
785    cb_data.srvc_res.service_uuid.inst_id = service.handle;
786    cb_data.srvc_res.service_uuid.uuid = service.uuid;
787
788    (*p_clcb->p_rcb->p_cback)(BTA_GATTC_SEARCH_RES_EVT, &cb_data);
789  }
790}
791
792std::list<tBTA_GATTC_SERVICE>* bta_gattc_get_services_srcb(
793    tBTA_GATTC_SERV* p_srcb) {
794  if (!p_srcb || p_srcb->srvc_cache.empty()) return NULL;
795
796  return &p_srcb->srvc_cache;
797}
798
799std::list<tBTA_GATTC_SERVICE>* bta_gattc_get_services(uint16_t conn_id) {
800  tBTA_GATTC_CLCB* p_clcb = bta_gattc_find_clcb_by_conn_id(conn_id);
801
802  if (p_clcb == NULL) return NULL;
803
804  tBTA_GATTC_SERV* p_srcb = p_clcb->p_srcb;
805
806  return bta_gattc_get_services_srcb(p_srcb);
807}
808
809static tBTA_GATTC_SERVICE* bta_gattc_get_service_for_handle_srcb(
810    tBTA_GATTC_SERV* p_srcb, uint16_t handle) {
811  std::list<tBTA_GATTC_SERVICE>* services = bta_gattc_get_services_srcb(p_srcb);
812  if (services == NULL) return NULL;
813  return bta_gattc_find_matching_service(*services, handle);
814}
815
816const tBTA_GATTC_SERVICE* bta_gattc_get_service_for_handle(uint16_t conn_id,
817                                                           uint16_t handle) {
818  std::list<tBTA_GATTC_SERVICE>* services = bta_gattc_get_services(conn_id);
819  if (services == NULL) return NULL;
820
821  return bta_gattc_find_matching_service(*services, handle);
822}
823
824tBTA_GATTC_CHARACTERISTIC* bta_gattc_get_characteristic_srcb(
825    tBTA_GATTC_SERV* p_srcb, uint16_t handle) {
826  tBTA_GATTC_SERVICE* service =
827      bta_gattc_get_service_for_handle_srcb(p_srcb, handle);
828
829  if (!service) return NULL;
830
831  for (tBTA_GATTC_CHARACTERISTIC& charac : service->characteristics) {
832    if (handle == charac.handle) return &charac;
833  }
834
835  return NULL;
836}
837
838tBTA_GATTC_CHARACTERISTIC* bta_gattc_get_characteristic(uint16_t conn_id,
839                                                        uint16_t handle) {
840  tBTA_GATTC_CLCB* p_clcb = bta_gattc_find_clcb_by_conn_id(conn_id);
841
842  if (p_clcb == NULL) return NULL;
843
844  tBTA_GATTC_SERV* p_srcb = p_clcb->p_srcb;
845  return bta_gattc_get_characteristic_srcb(p_srcb, handle);
846}
847
848const tBTA_GATTC_DESCRIPTOR* bta_gattc_get_descriptor_srcb(
849    tBTA_GATTC_SERV* p_srcb, uint16_t handle) {
850  const tBTA_GATTC_SERVICE* service =
851      bta_gattc_get_service_for_handle_srcb(p_srcb, handle);
852
853  if (!service) {
854    return NULL;
855  }
856
857  for (const tBTA_GATTC_CHARACTERISTIC& charac : service->characteristics) {
858    for (const tBTA_GATTC_DESCRIPTOR& desc : charac.descriptors) {
859      if (handle == desc.handle) return &desc;
860    }
861  }
862
863  return NULL;
864}
865
866const tBTA_GATTC_DESCRIPTOR* bta_gattc_get_descriptor(uint16_t conn_id,
867                                                      uint16_t handle) {
868  tBTA_GATTC_CLCB* p_clcb = bta_gattc_find_clcb_by_conn_id(conn_id);
869
870  if (p_clcb == NULL) return NULL;
871
872  tBTA_GATTC_SERV* p_srcb = p_clcb->p_srcb;
873  return bta_gattc_get_descriptor_srcb(p_srcb, handle);
874}
875
876/*******************************************************************************
877 *
878 * Function         bta_gattc_fill_gatt_db_el
879 *
880 * Description      fill a btgatt_db_element_t value
881 *
882 * Returns          None.
883 *
884 ******************************************************************************/
885void bta_gattc_fill_gatt_db_el(btgatt_db_element_t* p_attr,
886                               bt_gatt_db_attribute_type_t type,
887                               uint16_t att_handle, uint16_t s_handle,
888                               uint16_t e_handle, uint16_t id, const Uuid& uuid,
889                               uint8_t prop) {
890  p_attr->type = type;
891  p_attr->attribute_handle = att_handle;
892  p_attr->start_handle = s_handle;
893  p_attr->end_handle = e_handle;
894  p_attr->id = id;
895  p_attr->properties = prop;
896
897  // Permissions are not discoverable using the attribute protocol.
898  // Core 5.0, Part F, 3.2.5 Attribute Permissions
899  p_attr->permissions = 0;
900  p_attr->uuid = uuid;
901}
902
903/*******************************************************************************
904 * Returns          number of elements inside db from start_handle to end_handle
905 ******************************************************************************/
906static size_t bta_gattc_get_db_size(
907    const std::list<tBTA_GATTC_SERVICE>& services, uint16_t start_handle,
908    uint16_t end_handle) {
909  if (services.empty()) return 0;
910
911  size_t db_size = 0;
912
913  for (const tBTA_GATTC_SERVICE& service : services) {
914    if (service.s_handle < start_handle) continue;
915
916    if (service.e_handle > end_handle) break;
917
918    db_size++;
919
920    for (const tBTA_GATTC_CHARACTERISTIC& charac : service.characteristics) {
921      db_size++;
922
923      db_size += charac.descriptors.size();
924    }
925
926    db_size += service.included_svc.size();
927  }
928
929  return db_size;
930}
931
932/*******************************************************************************
933 *
934 * Function         bta_gattc_get_gatt_db_impl
935 *
936 * Description      copy the server GATT database into db parameter.
937 *
938 * Parameters       p_srvc_cb: server.
939 *                  db: output parameter which will contain GATT database copy.
940 *                      Caller is responsible for freeing it.
941 *                  count: output parameter which will contain number of
942 *                  elements in database.
943 *
944 * Returns          None.
945 *
946 ******************************************************************************/
947static void bta_gattc_get_gatt_db_impl(tBTA_GATTC_SERV* p_srvc_cb,
948                                       uint16_t start_handle,
949                                       uint16_t end_handle,
950                                       btgatt_db_element_t** db, int* count) {
951  VLOG(1) << __func__
952          << StringPrintf(": start_handle 0x%04x, end_handle 0x%04x",
953                          start_handle, end_handle);
954
955  if (p_srvc_cb->srvc_cache.empty()) {
956    *count = 0;
957    *db = NULL;
958    return;
959  }
960
961  size_t db_size =
962      bta_gattc_get_db_size(p_srvc_cb->srvc_cache, start_handle, end_handle);
963
964  void* buffer = osi_malloc(db_size * sizeof(btgatt_db_element_t));
965  btgatt_db_element_t* curr_db_attr = (btgatt_db_element_t*)buffer;
966
967  for (const tBTA_GATTC_SERVICE& service : p_srvc_cb->srvc_cache) {
968    if (service.s_handle < start_handle) continue;
969
970    if (service.e_handle > end_handle) break;
971
972    bta_gattc_fill_gatt_db_el(curr_db_attr,
973                              service.is_primary ? BTGATT_DB_PRIMARY_SERVICE
974                                                 : BTGATT_DB_SECONDARY_SERVICE,
975                              0 /* att_handle */, service.s_handle,
976                              service.e_handle, service.s_handle, service.uuid,
977                              0 /* prop */);
978    curr_db_attr++;
979
980    for (const tBTA_GATTC_CHARACTERISTIC& charac : service.characteristics) {
981      bta_gattc_fill_gatt_db_el(curr_db_attr, BTGATT_DB_CHARACTERISTIC,
982                                charac.handle, 0 /* s_handle */,
983                                0 /* e_handle */, charac.handle, charac.uuid,
984                                charac.properties);
985      curr_db_attr++;
986
987      for (const tBTA_GATTC_DESCRIPTOR& desc : charac.descriptors) {
988        bta_gattc_fill_gatt_db_el(
989            curr_db_attr, BTGATT_DB_DESCRIPTOR, desc.handle, 0 /* s_handle */,
990            0 /* e_handle */, desc.handle, desc.uuid, 0 /* property */);
991        curr_db_attr++;
992      }
993    }
994
995    for (const tBTA_GATTC_INCLUDED_SVC& p_isvc : service.included_svc) {
996      bta_gattc_fill_gatt_db_el(
997          curr_db_attr, BTGATT_DB_INCLUDED_SERVICE, p_isvc.handle,
998          p_isvc.included_service ? p_isvc.included_service->s_handle : 0,
999          0 /* e_handle */, p_isvc.handle, p_isvc.uuid, 0 /* property */);
1000      curr_db_attr++;
1001    }
1002  }
1003
1004  *db = (btgatt_db_element_t*)buffer;
1005  *count = db_size;
1006}
1007
1008/*******************************************************************************
1009 *
1010 * Function         bta_gattc_get_gatt_db
1011 *
1012 * Description      copy the server GATT database into db parameter.
1013 *
1014 * Parameters       conn_id: connection ID which identify the server.
1015 *                  db: output parameter which will contain GATT database copy.
1016 *                      Caller is responsible for freeing it.
1017 *                  count: number of elements in database.
1018 *
1019 * Returns          None.
1020 *
1021 ******************************************************************************/
1022void bta_gattc_get_gatt_db(uint16_t conn_id, uint16_t start_handle,
1023                           uint16_t end_handle, btgatt_db_element_t** db,
1024                           int* count) {
1025  tBTA_GATTC_CLCB* p_clcb = bta_gattc_find_clcb_by_conn_id(conn_id);
1026
1027  LOG_DEBUG(LOG_TAG, "%s", __func__);
1028  if (p_clcb == NULL) {
1029    LOG(ERROR) << "Unknown conn_id=" << loghex(conn_id);
1030    return;
1031  }
1032
1033  if (p_clcb->state != BTA_GATTC_CONN_ST) {
1034    LOG(ERROR) << "server cache not available, CLCB state=" << +p_clcb->state;
1035    return;
1036  }
1037
1038  if (!p_clcb->p_srcb ||
1039      p_clcb->p_srcb->p_srvc_list || /* no active discovery */
1040      p_clcb->p_srcb->srvc_cache.empty()) {
1041    LOG(ERROR) << "No server cache available";
1042    return;
1043  }
1044
1045  bta_gattc_get_gatt_db_impl(p_clcb->p_srcb, start_handle, end_handle, db,
1046                             count);
1047}
1048
1049/*******************************************************************************
1050 *
1051 * Function         bta_gattc_rebuild_cache
1052 *
1053 * Description      rebuild server cache from NV cache.
1054 *
1055 * Parameters
1056 *
1057 * Returns          None.
1058 *
1059 ******************************************************************************/
1060void bta_gattc_rebuild_cache(tBTA_GATTC_SERV* p_srvc_cb, uint16_t num_attr,
1061                             tBTA_GATTC_NV_ATTR* p_attr) {
1062  /* first attribute loading, initialize buffer */
1063  LOG(ERROR) << __func__;
1064
1065  p_srvc_cb->srvc_cache.clear();
1066
1067  while (num_attr > 0 && p_attr != NULL) {
1068    switch (p_attr->attr_type) {
1069      case BTA_GATTC_ATTR_TYPE_SRVC:
1070        add_service_to_gatt_db(p_srvc_cb->srvc_cache, p_attr->s_handle,
1071                               p_attr->e_handle, p_attr->uuid,
1072                               p_attr->is_primary);
1073        break;
1074
1075      case BTA_GATTC_ATTR_TYPE_CHAR:
1076        // TODO(jpawlowski): store decl_handle properly.
1077        add_characteristic_to_gatt_db(p_srvc_cb->srvc_cache, p_attr->s_handle,
1078                                      p_attr->s_handle, p_attr->uuid,
1079                                      p_attr->prop);
1080        break;
1081
1082      case BTA_GATTC_ATTR_TYPE_CHAR_DESCR:
1083        add_descriptor_to_gatt_db(p_srvc_cb->srvc_cache, p_attr->s_handle,
1084                                  p_attr->uuid);
1085        break;
1086      case BTA_GATTC_ATTR_TYPE_INCL_SRVC:
1087        add_incl_srvc_to_gatt_db(p_srvc_cb->srvc_cache, p_attr->s_handle,
1088                                 p_attr->uuid, p_attr->incl_srvc_handle);
1089        break;
1090    }
1091    p_attr++;
1092    num_attr--;
1093  }
1094}
1095
1096/*******************************************************************************
1097 *
1098 * Function         bta_gattc_fill_nv_attr
1099 *
1100 * Description      fill a NV attribute entry value
1101 *
1102 * Returns          None.
1103 *
1104 ******************************************************************************/
1105void bta_gattc_fill_nv_attr(tBTA_GATTC_NV_ATTR* p_attr, uint8_t type,
1106                            uint16_t s_handle, uint16_t e_handle, Uuid uuid,
1107                            uint8_t prop, uint16_t incl_srvc_handle,
1108                            bool is_primary) {
1109  p_attr->s_handle = s_handle;
1110  p_attr->e_handle = e_handle;
1111  p_attr->attr_type = type;
1112  p_attr->is_primary = is_primary;
1113  p_attr->id = 0;
1114  p_attr->prop = prop;
1115  p_attr->incl_srvc_handle = incl_srvc_handle;
1116  p_attr->uuid = uuid;
1117}
1118
1119/*******************************************************************************
1120 *
1121 * Function         bta_gattc_cache_save
1122 *
1123 * Description      save the server cache into NV
1124 *
1125 * Returns          None.
1126 *
1127 ******************************************************************************/
1128void bta_gattc_cache_save(tBTA_GATTC_SERV* p_srvc_cb, uint16_t conn_id) {
1129  if (p_srvc_cb->srvc_cache.empty()) return;
1130
1131  int i = 0;
1132  size_t db_size = bta_gattc_get_db_size(p_srvc_cb->srvc_cache, 0x0000, 0xFFFF);
1133  tBTA_GATTC_NV_ATTR* nv_attr =
1134      (tBTA_GATTC_NV_ATTR*)osi_malloc(db_size * sizeof(tBTA_GATTC_NV_ATTR));
1135
1136  for (const tBTA_GATTC_SERVICE& service : p_srvc_cb->srvc_cache) {
1137    bta_gattc_fill_nv_attr(&nv_attr[i++], BTA_GATTC_ATTR_TYPE_SRVC,
1138                           service.s_handle, service.e_handle, service.uuid,
1139                           0 /* properties */, 0 /* incl_srvc_handle */,
1140                           service.is_primary);
1141  }
1142
1143  for (const tBTA_GATTC_SERVICE& service : p_srvc_cb->srvc_cache) {
1144    for (const tBTA_GATTC_CHARACTERISTIC& charac : service.characteristics) {
1145      bta_gattc_fill_nv_attr(&nv_attr[i++], BTA_GATTC_ATTR_TYPE_CHAR,
1146                             charac.handle, 0, charac.uuid, charac.properties,
1147                             0 /* incl_srvc_handle */, false);
1148
1149      for (const tBTA_GATTC_DESCRIPTOR& desc : charac.descriptors) {
1150        bta_gattc_fill_nv_attr(&nv_attr[i++], BTA_GATTC_ATTR_TYPE_CHAR_DESCR,
1151                               desc.handle, 0, desc.uuid, 0 /* properties */,
1152                               0 /* incl_srvc_handle */, false);
1153      }
1154    }
1155
1156    for (const tBTA_GATTC_INCLUDED_SVC& p_isvc : service.included_svc) {
1157      bta_gattc_fill_nv_attr(&nv_attr[i++], BTA_GATTC_ATTR_TYPE_INCL_SRVC,
1158                             p_isvc.handle, 0, p_isvc.uuid, 0 /* properties */,
1159                             p_isvc.included_service->s_handle, false);
1160    }
1161  }
1162
1163  bta_gattc_cache_write(p_srvc_cb->server_bda, db_size, nv_attr);
1164  osi_free(nv_attr);
1165}
1166
1167/*******************************************************************************
1168 *
1169 * Function         bta_gattc_cache_load
1170 *
1171 * Description      Load GATT cache from storage for server.
1172 *
1173 * Parameter        p_clcb: pointer to server clcb, that will
1174 *                          be filled from storage
1175 * Returns          true on success, false otherwise
1176 *
1177 ******************************************************************************/
1178bool bta_gattc_cache_load(tBTA_GATTC_CLCB* p_clcb) {
1179  char fname[255] = {0};
1180  bta_gattc_generate_cache_file_name(fname, sizeof(fname),
1181                                     p_clcb->p_srcb->server_bda);
1182
1183  FILE* fd = fopen(fname, "rb");
1184  if (!fd) {
1185    LOG(ERROR) << __func__ << ": can't open GATT cache file " << fname
1186               << " for reading, error: " << strerror(errno);
1187    return false;
1188  }
1189
1190  uint16_t cache_ver = 0;
1191  tBTA_GATTC_NV_ATTR* attr = NULL;
1192  bool success = false;
1193  uint16_t num_attr = 0;
1194
1195  if (fread(&cache_ver, sizeof(uint16_t), 1, fd) != 1) {
1196    LOG(ERROR) << __func__ << ": can't read GATT cache version from: " << fname;
1197    goto done;
1198  }
1199
1200  if (cache_ver != GATT_CACHE_VERSION) {
1201    LOG(ERROR) << __func__ << ": wrong GATT cache version: " << fname;
1202    goto done;
1203  }
1204
1205  if (fread(&num_attr, sizeof(uint16_t), 1, fd) != 1) {
1206    LOG(ERROR) << __func__
1207               << ": can't read number of GATT attributes: " << fname;
1208    goto done;
1209  }
1210
1211  if (num_attr > 0xFFFF) {
1212    LOG(ERROR) << __func__ << ": more than 0xFFFF GATT attributes: " << fname;
1213    goto done;
1214  }
1215
1216  attr = (tBTA_GATTC_NV_ATTR*)osi_malloc(sizeof(tBTA_GATTC_NV_ATTR) * num_attr);
1217
1218  if (fread(attr, sizeof(tBTA_GATTC_NV_ATTR), num_attr, fd) != num_attr) {
1219    LOG(ERROR) << __func__ << "s: can't read GATT attributes: " << fname;
1220    goto done;
1221  }
1222
1223  bta_gattc_rebuild_cache(p_clcb->p_srcb, num_attr, attr);
1224
1225  success = true;
1226
1227done:
1228  osi_free(attr);
1229  fclose(fd);
1230  return success;
1231}
1232
1233/*******************************************************************************
1234 *
1235 * Function         bta_gattc_cache_write
1236 *
1237 * Description      This callout function is executed by GATT when a server
1238 *                  cache is available to save.
1239 *
1240 * Parameter        server_bda: server bd address of this cache belongs to
1241 *                  num_attr: number of attribute to be save.
1242 *                  attr: pointer to the list of attributes to save.
1243 * Returns
1244 *
1245 ******************************************************************************/
1246static void bta_gattc_cache_write(const RawAddress& server_bda,
1247                                  uint16_t num_attr, tBTA_GATTC_NV_ATTR* attr) {
1248  char fname[255] = {0};
1249  bta_gattc_generate_cache_file_name(fname, sizeof(fname), server_bda);
1250
1251  FILE* fd = fopen(fname, "wb");
1252  if (!fd) {
1253    LOG(ERROR) << __func__
1254               << ": can't open GATT cache file for writing: " << fname;
1255    return;
1256  }
1257
1258  uint16_t cache_ver = GATT_CACHE_VERSION;
1259  if (fwrite(&cache_ver, sizeof(uint16_t), 1, fd) != 1) {
1260    LOG(ERROR) << __func__ << ": can't write GATT cache version: " << fname;
1261    fclose(fd);
1262    return;
1263  }
1264
1265  if (fwrite(&num_attr, sizeof(uint16_t), 1, fd) != 1) {
1266    LOG(ERROR) << __func__
1267               << ": can't write GATT cache attribute count: " << fname;
1268    fclose(fd);
1269    return;
1270  }
1271
1272  if (fwrite(attr, sizeof(tBTA_GATTC_NV_ATTR), num_attr, fd) != num_attr) {
1273    LOG(ERROR) << __func__ << ": can't write GATT cache attributes: " << fname;
1274    fclose(fd);
1275    return;
1276  }
1277
1278  fclose(fd);
1279}
1280
1281/*******************************************************************************
1282 *
1283 * Function         bta_gattc_cache_reset
1284 *
1285 * Description      This callout function is executed by GATTC to reset cache in
1286 *                  application
1287 *
1288 * Parameter        server_bda: server bd address of this cache belongs to
1289 *
1290 * Returns          void.
1291 *
1292 ******************************************************************************/
1293void bta_gattc_cache_reset(const RawAddress& server_bda) {
1294  VLOG(1) << __func__;
1295  char fname[255] = {0};
1296  bta_gattc_generate_cache_file_name(fname, sizeof(fname), server_bda);
1297  unlink(fname);
1298}
1299