/****************************************************************************** * * Copyright 2003-2012 Broadcom Corporation * * 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. * ******************************************************************************/ /****************************************************************************** * * This file contains the GATT client discovery procedures and cache * related functions. * ******************************************************************************/ #define LOG_TAG "bt_bta_gattc" #include "bt_target.h" #include #include #include #include #include "bt_common.h" #include "bta_gattc_int.h" #include "bta_sys.h" #include "btm_api.h" #include "btm_ble_api.h" #include "btm_int.h" #include "osi/include/log.h" #include "osi/include/osi.h" #include "sdp_api.h" #include "sdpdefs.h" #include "utl.h" using bluetooth::Uuid; using base::StringPrintf; static void bta_gattc_cache_write(const RawAddress& server_bda, uint16_t num_attr, tBTA_GATTC_NV_ATTR* attr); static void bta_gattc_char_dscpt_disc_cmpl(uint16_t conn_id, tBTA_GATTC_SERV* p_srvc_cb); static tGATT_STATUS bta_gattc_sdp_service_disc(uint16_t conn_id, tBTA_GATTC_SERV* p_server_cb); const tBTA_GATTC_DESCRIPTOR* bta_gattc_get_descriptor_srcb( tBTA_GATTC_SERV* p_srcb, uint16_t handle); tBTA_GATTC_CHARACTERISTIC* bta_gattc_get_characteristic_srcb( tBTA_GATTC_SERV* p_srcb, uint16_t handle); #define BTA_GATT_SDP_DB_SIZE 4096 #define GATT_CACHE_PREFIX "/data/misc/bluetooth/gatt_cache_" #define GATT_CACHE_VERSION 4 static void bta_gattc_generate_cache_file_name(char* buffer, size_t buffer_len, const RawAddress& bda) { snprintf(buffer, buffer_len, "%s%02x%02x%02x%02x%02x%02x", GATT_CACHE_PREFIX, bda.address[0], bda.address[1], bda.address[2], bda.address[3], bda.address[4], bda.address[5]); } /***************************************************************************** * Constants and data types ****************************************************************************/ typedef struct { tSDP_DISCOVERY_DB* p_sdp_db; uint16_t sdp_conn_id; } tBTA_GATTC_CB_DATA; #if (BTA_GATT_DEBUG == TRUE) /* utility functions */ /* debug function to display the server cache */ static void display_db(const std::vector& cache) { for (const tBTA_GATTC_SERVICE& service : cache) { LOG(ERROR) << "Service: s_handle=" << loghex(service.s_handle) << ", e_handle=" << loghex(service.e_handle) << ", inst=" << loghex(service.handle) << ", uuid=" << service.uuid; if (service.characteristics.empty()) { LOG(ERROR) << "\t No characteristics"; continue; } for (const tBTA_GATTC_CHARACTERISTIC& c : service.characteristics) { LOG(ERROR) << "\t Characteristic value_handle=" << loghex(c.value_handle) << ", uuid=" << c.uuid << ", prop=" << loghex(c.properties); if (c.descriptors.empty()) { LOG(ERROR) << "\t\t No descriptors"; continue; } for (const tBTA_GATTC_DESCRIPTOR& d : c.descriptors) { LOG(ERROR) << "\t\t Descriptor handle=" << loghex(d.handle) << ", uuid=" << d.uuid; } } } } /* debug function to display the server cache */ static void bta_gattc_display_cache_server( const std::vector& cache) { LOG(ERROR) << "<================Start Server Cache =============>"; display_db(cache); LOG(ERROR) << "<================End Server Cache =============>"; LOG(ERROR) << " "; } /** debug function to display the exploration list */ static void bta_gattc_display_explore_record( const std::vector& cache) { LOG(ERROR) << "<================Start Explore Queue =============>"; display_db(cache); LOG(ERROR) << "<================ End Explore Queue =============>"; LOG(ERROR) << " "; } #endif /* BTA_GATT_DEBUG == TRUE */ /******************************************************************************* * * Function bta_gattc_init_cache * * Description Initialize the database cache and discovery related * resources. * * Returns status * ******************************************************************************/ tGATT_STATUS bta_gattc_init_cache(tBTA_GATTC_SERV* p_srvc_cb) { // clear reallocating std::vector().swap(p_srvc_cb->srvc_cache); std::vector().swap(p_srvc_cb->pending_discovery); return GATT_SUCCESS; } tBTA_GATTC_SERVICE* bta_gattc_find_matching_service( std::vector& services, uint16_t handle) { for (tBTA_GATTC_SERVICE& service : services) { if (handle >= service.s_handle && handle <= service.e_handle) return &service; } return nullptr; } /** Add a service into GATT database */ static void add_service_to_gatt_db(std::vector& gatt_db, uint16_t s_handle, uint16_t e_handle, const Uuid& uuid, bool is_primary) { #if (BTA_GATT_DEBUG == TRUE) VLOG(1) << "Add a service into GATT DB"; #endif gatt_db.emplace_back(tBTA_GATTC_SERVICE{ .s_handle = s_handle, .e_handle = e_handle, .is_primary = is_primary, .uuid = uuid, .handle = s_handle, }); } /** Add a characteristic into GATT database */ static void add_characteristic_to_gatt_db( std::vector& gatt_db, uint16_t attr_handle, uint16_t value_handle, const Uuid& uuid, uint8_t property) { #if (BTA_GATT_DEBUG == TRUE) VLOG(1) << __func__ << ": Add a characteristic into service. handle:" << +value_handle << " uuid:" << uuid << " property=0x" << std::hex << +property; #endif tBTA_GATTC_SERVICE* service = bta_gattc_find_matching_service(gatt_db, attr_handle); if (!service) { LOG(ERROR) << "Illegal action to add char/descr/incl srvc for non-existing " "service!"; return; } /* TODO(jpawlowski): We should use attribute handle, not value handle to refer to characteristic. This is just a temporary workaround. */ if (service->e_handle < value_handle) service->e_handle = value_handle; service->characteristics.emplace_back( tBTA_GATTC_CHARACTERISTIC{.declaration_handle = attr_handle, .value_handle = value_handle, .properties = property, .uuid = uuid}); return; } /* Add an descriptor into database cache buffer */ static void add_descriptor_to_gatt_db(std::vector& gatt_db, uint16_t handle, const Uuid& uuid) { #if (BTA_GATT_DEBUG == TRUE) VLOG(1) << __func__ << ": add descriptor, handle=" << loghex(handle) << ", uuid=" << uuid; #endif tBTA_GATTC_SERVICE* service = bta_gattc_find_matching_service(gatt_db, handle); if (!service) { LOG(ERROR) << "Illegal action to add descriptor for non-existing service!"; return; } if (service->characteristics.empty()) { LOG(ERROR) << __func__ << ": Illegal action to add descriptor before adding a " "characteristic!"; return; } tBTA_GATTC_CHARACTERISTIC* char_node = &service->characteristics.front(); for (auto it = service->characteristics.begin(); it != service->characteristics.end(); it++) { if (it->value_handle > handle) break; char_node = &(*it); } char_node->descriptors.emplace_back( tBTA_GATTC_DESCRIPTOR{.handle = handle, .uuid = uuid}); } /* Add an attribute into database cache buffer */ static void add_incl_srvc_to_gatt_db(std::vector& gatt_db, uint16_t handle, const Uuid& uuid, uint16_t incl_srvc_s_handle) { #if (BTA_GATT_DEBUG == TRUE) VLOG(1) << __func__ << ": add included service, handle=" << loghex(handle) << ", uuid=" << uuid; #endif tBTA_GATTC_SERVICE* service = bta_gattc_find_matching_service(gatt_db, handle); if (!service) { LOG(ERROR) << "Illegal action to add incl srvc for non-existing service!"; return; } tBTA_GATTC_SERVICE* included_service = bta_gattc_find_matching_service(gatt_db, incl_srvc_s_handle); if (!included_service) { LOG(ERROR) << __func__ << ": Illegal action to add non-existing included service!"; return; } service->included_svc.emplace_back(tBTA_GATTC_INCLUDED_SVC{ .handle = handle, .uuid = uuid, .owning_service = service, .included_service = included_service, }); } /** Start primary service discovery */ tGATT_STATUS bta_gattc_discover_pri_service(uint16_t conn_id, tBTA_GATTC_SERV* p_server_cb, uint8_t disc_type) { tBTA_GATTC_CLCB* p_clcb = bta_gattc_find_clcb_by_conn_id(conn_id); if (!p_clcb) return GATT_ERROR; if (p_clcb->transport == BTA_TRANSPORT_LE) { tGATT_DISC_PARAM param{.s_handle = 0x0001, .e_handle = 0xFFFF}; return GATTC_Discover(conn_id, disc_type, ¶m); } return bta_gattc_sdp_service_disc(conn_id, p_server_cb); } /** Start discovery for characteristic descriptor */ void bta_gattc_start_disc_char_dscp(uint16_t conn_id, tBTA_GATTC_SERV* p_srvc_cb) { VLOG(1) << "starting discover characteristics descriptor"; auto& characteristic = p_srvc_cb->pending_char; uint16_t end_handle = 0xFFFF; // if there are more characteristics in the service if (std::next(p_srvc_cb->pending_char) != p_srvc_cb->pending_service->characteristics.end()) { // end at beginning of next characteristic end_handle = std::next(p_srvc_cb->pending_char)->declaration_handle - 1; } else { // end at the end of current service end_handle = p_srvc_cb->pending_service->e_handle; } tGATT_DISC_PARAM param{ .s_handle = (uint16_t)(characteristic->value_handle + 1), .e_handle = end_handle}; if (GATTC_Discover(conn_id, GATT_DISC_CHAR_DSCPT, ¶m) != 0) { bta_gattc_char_dscpt_disc_cmpl(conn_id, p_srvc_cb); } } /** process the service discovery complete event */ static void bta_gattc_explore_srvc(uint16_t conn_id, tBTA_GATTC_SERV* p_srvc_cb) { tBTA_GATTC_CLCB* p_clcb = bta_gattc_find_clcb_by_conn_id(conn_id); if (!p_clcb) { LOG(ERROR) << "unknown conn_id=" << +conn_id; return; } /* start expore a service if there is service not been explored */ if (p_srvc_cb->pending_service != p_srvc_cb->pending_discovery.end()) { auto& service = *p_srvc_cb->pending_service; VLOG(1) << "Start service discovery"; /* start discovering included services */ tGATT_DISC_PARAM param = {.s_handle = service.s_handle, .e_handle = service.e_handle}; GATTC_Discover(conn_id, GATT_DISC_INC_SRVC, ¶m); return; } /* no service found at all, the end of server discovery*/ LOG(INFO) << __func__ << ": no more services found"; p_srvc_cb->srvc_cache.swap(p_srvc_cb->pending_discovery); std::vector().swap(p_srvc_cb->pending_discovery); #if (BTA_GATT_DEBUG == TRUE) bta_gattc_display_cache_server(p_srvc_cb->srvc_cache); #endif /* save cache to NV */ p_clcb->p_srcb->state = BTA_GATTC_SERV_SAVE; if (btm_sec_is_a_bonded_dev(p_srvc_cb->server_bda)) { bta_gattc_cache_save(p_clcb->p_srcb, p_clcb->bta_conn_id); } bta_gattc_reset_discover_st(p_clcb->p_srcb, GATT_SUCCESS); } /** process the char descriptor discovery complete event */ static void bta_gattc_char_dscpt_disc_cmpl(uint16_t conn_id, tBTA_GATTC_SERV* p_srvc_cb) { ++p_srvc_cb->pending_char; if (p_srvc_cb->pending_char != p_srvc_cb->pending_service->characteristics.end()) { /* start discoverying next characteristic for char descriptor */ bta_gattc_start_disc_char_dscp(conn_id, p_srvc_cb); return; } /* all characteristic has been explored, start with next service if any */ #if (BTA_GATT_DEBUG == TRUE) LOG(ERROR) << "all char has been explored"; #endif p_srvc_cb->pending_service++; bta_gattc_explore_srvc(conn_id, p_srvc_cb); } static bool bta_gattc_srvc_in_list(std::vector& services, uint16_t s_handle, uint16_t e_handle, Uuid) { if (!GATT_HANDLE_IS_VALID(s_handle) || !GATT_HANDLE_IS_VALID(e_handle)) { LOG(ERROR) << "invalid included service s_handle=" << loghex(s_handle) << ", e_handle=" << loghex(e_handle); return true; } for (tBTA_GATTC_SERVICE& service : services) { if (service.s_handle == s_handle || service.e_handle == e_handle) return true; } return false; } /******************************************************************************* * * Function bta_gattc_sdp_callback * * Description Process the discovery result from sdp * * Returns void * ******************************************************************************/ void bta_gattc_sdp_callback(uint16_t sdp_status, void* user_data) { tBTA_GATTC_CB_DATA* cb_data = (tBTA_GATTC_CB_DATA*)user_data; tBTA_GATTC_SERV* p_srvc_cb = bta_gattc_find_scb_by_cid(cb_data->sdp_conn_id); if (p_srvc_cb == nullptr) { LOG(ERROR) << "GATT service discovery is done on unknown connection"; } else { bool no_pending_disc = p_srvc_cb->pending_discovery.empty(); if ((sdp_status == SDP_SUCCESS) || (sdp_status == SDP_DB_FULL)) { tSDP_DISC_REC* p_sdp_rec = NULL; do { /* find a service record, report it */ p_sdp_rec = SDP_FindServiceInDb(cb_data->p_sdp_db, 0, p_sdp_rec); if (p_sdp_rec) { Uuid service_uuid; if (SDP_FindServiceUUIDInRec(p_sdp_rec, &service_uuid)) { tSDP_PROTOCOL_ELEM pe; if (SDP_FindProtocolListElemInRec(p_sdp_rec, UUID_PROTOCOL_ATT, &pe)) { uint16_t start_handle = (uint16_t)pe.params[0]; uint16_t end_handle = (uint16_t)pe.params[1]; #if (BTA_GATT_DEBUG == TRUE) VLOG(1) << "Found ATT service uuid=" << service_uuid << ", s_handle=" << loghex(start_handle) << ", e_handle=" << loghex(end_handle); #endif if (GATT_HANDLE_IS_VALID(start_handle) && GATT_HANDLE_IS_VALID(end_handle) && p_srvc_cb != NULL) { /* discover services result, add services into a service list */ add_service_to_gatt_db(p_srvc_cb->pending_discovery, start_handle, end_handle, service_uuid, true); } else { LOG(ERROR) << "invalid start_handle=" << loghex(start_handle) << ", end_handle=" << loghex(end_handle); } } } } } while (p_sdp_rec); } if (no_pending_disc) { p_srvc_cb->pending_service = p_srvc_cb->pending_discovery.begin(); } /* start discover primary service */ bta_gattc_explore_srvc(cb_data->sdp_conn_id, p_srvc_cb); } /* both were allocated in bta_gattc_sdp_service_disc */ osi_free(cb_data->p_sdp_db); osi_free(cb_data); } /******************************************************************************* * * Function bta_gattc_sdp_service_disc * * Description Start DSP Service Discovert * * Returns void * ******************************************************************************/ static tGATT_STATUS bta_gattc_sdp_service_disc(uint16_t conn_id, tBTA_GATTC_SERV* p_server_cb) { uint16_t num_attrs = 2; uint16_t attr_list[2]; /* * On success, cb_data will be freed inside bta_gattc_sdp_callback, * otherwise it will be freed within this function. */ tBTA_GATTC_CB_DATA* cb_data = (tBTA_GATTC_CB_DATA*)osi_malloc(sizeof(tBTA_GATTC_CB_DATA)); cb_data->p_sdp_db = (tSDP_DISCOVERY_DB*)osi_malloc(BTA_GATT_SDP_DB_SIZE); attr_list[0] = ATTR_ID_SERVICE_CLASS_ID_LIST; attr_list[1] = ATTR_ID_PROTOCOL_DESC_LIST; Uuid uuid = Uuid::From16Bit(UUID_PROTOCOL_ATT); SDP_InitDiscoveryDb(cb_data->p_sdp_db, BTA_GATT_SDP_DB_SIZE, 1, &uuid, num_attrs, attr_list); if (!SDP_ServiceSearchAttributeRequest2(p_server_cb->server_bda, cb_data->p_sdp_db, &bta_gattc_sdp_callback, cb_data)) { osi_free(cb_data->p_sdp_db); osi_free(cb_data); return GATT_ERROR; } cb_data->sdp_conn_id = conn_id; return GATT_SUCCESS; } /** callback function to GATT client stack */ void bta_gattc_disc_res_cback(uint16_t conn_id, tGATT_DISC_TYPE disc_type, tGATT_DISC_RES* p_data) { tBTA_GATTC_CLCB* p_clcb = bta_gattc_find_clcb_by_conn_id(conn_id); tBTA_GATTC_SERV* p_srvc_cb = bta_gattc_find_scb_by_cid(conn_id); if (!p_srvc_cb || !p_clcb || p_clcb->state != BTA_GATTC_DISCOVER_ST) return; switch (disc_type) { case GATT_DISC_SRVC_ALL: case GATT_DISC_SRVC_BY_UUID: /* discover services result, add services into a service list */ add_service_to_gatt_db(p_srvc_cb->pending_discovery, p_data->handle, p_data->value.group_value.e_handle, p_data->value.group_value.service_type, true); break; case GATT_DISC_INC_SRVC: /* add included service into service list if it's secondary or it never showed up in the primary service search */ if (!bta_gattc_srvc_in_list(p_srvc_cb->pending_discovery, p_data->value.incl_service.s_handle, p_data->value.incl_service.e_handle, p_data->value.incl_service.service_type)) { add_service_to_gatt_db(p_srvc_cb->pending_discovery, p_data->value.incl_service.s_handle, p_data->value.incl_service.e_handle, p_data->value.incl_service.service_type, false); } /* add into database */ add_incl_srvc_to_gatt_db(p_srvc_cb->pending_discovery, p_data->handle, p_data->value.incl_service.service_type, p_data->value.incl_service.s_handle); break; case GATT_DISC_CHAR: /* add char value into database */ add_characteristic_to_gatt_db(p_srvc_cb->pending_discovery, p_data->handle, p_data->value.dclr_value.val_handle, p_data->value.dclr_value.char_uuid, p_data->value.dclr_value.char_prop); break; case GATT_DISC_CHAR_DSCPT: add_descriptor_to_gatt_db(p_srvc_cb->pending_discovery, p_data->handle, p_data->type); break; } } void bta_gattc_disc_cmpl_cback(uint16_t conn_id, tGATT_DISC_TYPE disc_type, tGATT_STATUS status) { tBTA_GATTC_CLCB* p_clcb = bta_gattc_find_clcb_by_conn_id(conn_id); if (p_clcb && (status != GATT_SUCCESS || p_clcb->status != GATT_SUCCESS)) { if (status == GATT_SUCCESS) p_clcb->status = status; bta_gattc_sm_execute(p_clcb, BTA_GATTC_DISCOVER_CMPL_EVT, NULL); return; } tBTA_GATTC_SERV* p_srvc_cb = bta_gattc_find_scb_by_cid(conn_id); if (!p_srvc_cb) return; switch (disc_type) { case GATT_DISC_SRVC_ALL: case GATT_DISC_SRVC_BY_UUID: // definition of all services are discovered, now it's time to discover // their content #if (BTA_GATT_DEBUG == TRUE) bta_gattc_display_explore_record(p_srvc_cb->pending_discovery); #endif p_srvc_cb->pending_service = p_srvc_cb->pending_discovery.begin(); bta_gattc_explore_srvc(conn_id, p_srvc_cb); break; case GATT_DISC_INC_SRVC: { auto& service = *p_srvc_cb->pending_service; /* start discoverying characteristic */ tGATT_DISC_PARAM param = {.s_handle = service.s_handle, .e_handle = service.e_handle}; GATTC_Discover(conn_id, GATT_DISC_CHAR, ¶m); break; } case GATT_DISC_CHAR: { #if (BTA_GATT_DEBUG == TRUE) bta_gattc_display_explore_record(p_srvc_cb->pending_discovery); #endif auto& service = *p_srvc_cb->pending_service; if (!service.characteristics.empty()) { /* discover descriptors */ p_srvc_cb->pending_char = service.characteristics.begin(); bta_gattc_start_disc_char_dscp(conn_id, p_srvc_cb); return; } /* start next service */ ++p_srvc_cb->pending_service; bta_gattc_explore_srvc(conn_id, p_srvc_cb); break; } case GATT_DISC_CHAR_DSCPT: bta_gattc_char_dscpt_disc_cmpl(conn_id, p_srvc_cb); break; } } /** search local cache for matching service record */ void bta_gattc_search_service(tBTA_GATTC_CLCB* p_clcb, Uuid* p_uuid) { for (const tBTA_GATTC_SERVICE& service : p_clcb->p_srcb->srvc_cache) { if (p_uuid && *p_uuid != service.uuid) continue; #if (BTA_GATT_DEBUG == TRUE) VLOG(1) << __func__ << "found service " << service.uuid << ", inst:" << +service.handle << " handle:" << +service.s_handle; #endif if (!p_clcb->p_rcb->p_cback) continue; tBTA_GATTC cb_data; memset(&cb_data, 0, sizeof(tBTA_GATTC)); cb_data.srvc_res.conn_id = p_clcb->bta_conn_id; cb_data.srvc_res.service_uuid.inst_id = service.handle; cb_data.srvc_res.service_uuid.uuid = service.uuid; (*p_clcb->p_rcb->p_cback)(BTA_GATTC_SEARCH_RES_EVT, &cb_data); } } std::vector* bta_gattc_get_services_srcb( tBTA_GATTC_SERV* p_srcb) { if (!p_srcb || p_srcb->srvc_cache.empty()) return NULL; return &p_srcb->srvc_cache; } std::vector* bta_gattc_get_services(uint16_t conn_id) { tBTA_GATTC_CLCB* p_clcb = bta_gattc_find_clcb_by_conn_id(conn_id); if (p_clcb == NULL) return NULL; tBTA_GATTC_SERV* p_srcb = p_clcb->p_srcb; return bta_gattc_get_services_srcb(p_srcb); } tBTA_GATTC_SERVICE* bta_gattc_get_service_for_handle_srcb( tBTA_GATTC_SERV* p_srcb, uint16_t handle) { std::vector* services = bta_gattc_get_services_srcb(p_srcb); if (services == NULL) return NULL; return bta_gattc_find_matching_service(*services, handle); } const tBTA_GATTC_SERVICE* bta_gattc_get_service_for_handle(uint16_t conn_id, uint16_t handle) { std::vector* services = bta_gattc_get_services(conn_id); if (services == NULL) return NULL; return bta_gattc_find_matching_service(*services, handle); } tBTA_GATTC_CHARACTERISTIC* bta_gattc_get_characteristic_srcb( tBTA_GATTC_SERV* p_srcb, uint16_t handle) { tBTA_GATTC_SERVICE* service = bta_gattc_get_service_for_handle_srcb(p_srcb, handle); if (!service) return NULL; for (tBTA_GATTC_CHARACTERISTIC& charac : service->characteristics) { if (handle == charac.value_handle) return &charac; } return NULL; } tBTA_GATTC_CHARACTERISTIC* bta_gattc_get_characteristic(uint16_t conn_id, uint16_t handle) { tBTA_GATTC_CLCB* p_clcb = bta_gattc_find_clcb_by_conn_id(conn_id); if (p_clcb == NULL) return NULL; tBTA_GATTC_SERV* p_srcb = p_clcb->p_srcb; return bta_gattc_get_characteristic_srcb(p_srcb, handle); } const tBTA_GATTC_DESCRIPTOR* bta_gattc_get_descriptor_srcb( tBTA_GATTC_SERV* p_srcb, uint16_t handle) { const tBTA_GATTC_SERVICE* service = bta_gattc_get_service_for_handle_srcb(p_srcb, handle); if (!service) { return NULL; } for (const tBTA_GATTC_CHARACTERISTIC& charac : service->characteristics) { for (const tBTA_GATTC_DESCRIPTOR& desc : charac.descriptors) { if (handle == desc.handle) return &desc; } } return NULL; } const tBTA_GATTC_DESCRIPTOR* bta_gattc_get_descriptor(uint16_t conn_id, uint16_t handle) { tBTA_GATTC_CLCB* p_clcb = bta_gattc_find_clcb_by_conn_id(conn_id); if (p_clcb == NULL) return NULL; tBTA_GATTC_SERV* p_srcb = p_clcb->p_srcb; return bta_gattc_get_descriptor_srcb(p_srcb, handle); } tBTA_GATTC_CHARACTERISTIC* bta_gattc_get_owning_characteristic_srcb( tBTA_GATTC_SERV* p_srcb, uint16_t handle) { tBTA_GATTC_SERVICE* service = bta_gattc_get_service_for_handle_srcb(p_srcb, handle); if (!service) return NULL; for (tBTA_GATTC_CHARACTERISTIC& charac : service->characteristics) { for (const tBTA_GATTC_DESCRIPTOR& desc : charac.descriptors) { if (handle == desc.handle) return &charac; } } return NULL; } const tBTA_GATTC_CHARACTERISTIC* bta_gattc_get_owning_characteristic( uint16_t conn_id, uint16_t handle) { tBTA_GATTC_CLCB* p_clcb = bta_gattc_find_clcb_by_conn_id(conn_id); if (!p_clcb) return NULL; return bta_gattc_get_owning_characteristic_srcb(p_clcb->p_srcb, handle); } /******************************************************************************* * * Function bta_gattc_fill_gatt_db_el * * Description fill a btgatt_db_element_t value * * Returns None. * ******************************************************************************/ void bta_gattc_fill_gatt_db_el(btgatt_db_element_t* p_attr, bt_gatt_db_attribute_type_t type, uint16_t att_handle, uint16_t s_handle, uint16_t e_handle, uint16_t id, const Uuid& uuid, uint8_t prop) { p_attr->type = type; p_attr->attribute_handle = att_handle; p_attr->start_handle = s_handle; p_attr->end_handle = e_handle; p_attr->id = id; p_attr->properties = prop; // Permissions are not discoverable using the attribute protocol. // Core 5.0, Part F, 3.2.5 Attribute Permissions p_attr->permissions = 0; p_attr->uuid = uuid; } /******************************************************************************* * Returns number of elements inside db from start_handle to end_handle ******************************************************************************/ static size_t bta_gattc_get_db_size( const std::vector& services, uint16_t start_handle, uint16_t end_handle) { if (services.empty()) return 0; size_t db_size = 0; for (const tBTA_GATTC_SERVICE& service : services) { if (service.s_handle < start_handle) continue; if (service.e_handle > end_handle) break; db_size++; for (const tBTA_GATTC_CHARACTERISTIC& charac : service.characteristics) { db_size++; db_size += charac.descriptors.size(); } db_size += service.included_svc.size(); } return db_size; } /******************************************************************************* * * Function bta_gattc_get_gatt_db_impl * * Description copy the server GATT database into db parameter. * * Parameters p_srvc_cb: server. * db: output parameter which will contain GATT database copy. * Caller is responsible for freeing it. * count: output parameter which will contain number of * elements in database. * * Returns None. * ******************************************************************************/ static void bta_gattc_get_gatt_db_impl(tBTA_GATTC_SERV* p_srvc_cb, uint16_t start_handle, uint16_t end_handle, btgatt_db_element_t** db, int* count) { VLOG(1) << __func__ << StringPrintf(": start_handle 0x%04x, end_handle 0x%04x", start_handle, end_handle); if (p_srvc_cb->srvc_cache.empty()) { *count = 0; *db = NULL; return; } size_t db_size = bta_gattc_get_db_size(p_srvc_cb->srvc_cache, start_handle, end_handle); void* buffer = osi_malloc(db_size * sizeof(btgatt_db_element_t)); btgatt_db_element_t* curr_db_attr = (btgatt_db_element_t*)buffer; for (const tBTA_GATTC_SERVICE& service : p_srvc_cb->srvc_cache) { if (service.s_handle < start_handle) continue; if (service.e_handle > end_handle) break; bta_gattc_fill_gatt_db_el(curr_db_attr, service.is_primary ? BTGATT_DB_PRIMARY_SERVICE : BTGATT_DB_SECONDARY_SERVICE, 0 /* att_handle */, service.s_handle, service.e_handle, service.s_handle, service.uuid, 0 /* prop */); curr_db_attr++; for (const tBTA_GATTC_CHARACTERISTIC& charac : service.characteristics) { bta_gattc_fill_gatt_db_el(curr_db_attr, BTGATT_DB_CHARACTERISTIC, charac.value_handle, 0 /* s_handle */, 0 /* e_handle */, charac.value_handle, charac.uuid, charac.properties); curr_db_attr++; for (const tBTA_GATTC_DESCRIPTOR& desc : charac.descriptors) { bta_gattc_fill_gatt_db_el( curr_db_attr, BTGATT_DB_DESCRIPTOR, desc.handle, 0 /* s_handle */, 0 /* e_handle */, desc.handle, desc.uuid, 0 /* property */); curr_db_attr++; } } for (const tBTA_GATTC_INCLUDED_SVC& p_isvc : service.included_svc) { bta_gattc_fill_gatt_db_el( curr_db_attr, BTGATT_DB_INCLUDED_SERVICE, p_isvc.handle, p_isvc.included_service ? p_isvc.included_service->s_handle : 0, 0 /* e_handle */, p_isvc.handle, p_isvc.uuid, 0 /* property */); curr_db_attr++; } } *db = (btgatt_db_element_t*)buffer; *count = db_size; } /******************************************************************************* * * Function bta_gattc_get_gatt_db * * Description copy the server GATT database into db parameter. * * Parameters conn_id: connection ID which identify the server. * db: output parameter which will contain GATT database copy. * Caller is responsible for freeing it. * count: number of elements in database. * * Returns None. * ******************************************************************************/ void bta_gattc_get_gatt_db(uint16_t conn_id, uint16_t start_handle, uint16_t end_handle, btgatt_db_element_t** db, int* count) { tBTA_GATTC_CLCB* p_clcb = bta_gattc_find_clcb_by_conn_id(conn_id); LOG_DEBUG(LOG_TAG, "%s", __func__); if (p_clcb == NULL) { LOG(ERROR) << "Unknown conn_id=" << loghex(conn_id); return; } if (p_clcb->state != BTA_GATTC_CONN_ST) { LOG(ERROR) << "server cache not available, CLCB state=" << +p_clcb->state; return; } if (!p_clcb->p_srcb || !p_clcb->p_srcb->pending_discovery.empty() || /* no active discovery */ p_clcb->p_srcb->srvc_cache.empty()) { LOG(ERROR) << "No server cache available"; return; } bta_gattc_get_gatt_db_impl(p_clcb->p_srcb, start_handle, end_handle, db, count); } /* rebuild server cache from NV cache */ void bta_gattc_rebuild_cache(tBTA_GATTC_SERV* p_srvc_cb, uint16_t num_attr, tBTA_GATTC_NV_ATTR* p_attr) { /* first attribute loading, initialize buffer */ LOG(INFO) << __func__ << " " << num_attr; // clear reallocating std::vector().swap(p_srvc_cb->srvc_cache); while (num_attr > 0 && p_attr != NULL) { switch (p_attr->attr_type) { case BTA_GATTC_ATTR_TYPE_SRVC: add_service_to_gatt_db(p_srvc_cb->srvc_cache, p_attr->s_handle, p_attr->e_handle, p_attr->uuid, p_attr->is_primary); break; case BTA_GATTC_ATTR_TYPE_CHAR: add_characteristic_to_gatt_db(p_srvc_cb->srvc_cache, p_attr->s_handle, p_attr->s_handle, p_attr->uuid, p_attr->prop); break; case BTA_GATTC_ATTR_TYPE_CHAR_DESCR: add_descriptor_to_gatt_db(p_srvc_cb->srvc_cache, p_attr->s_handle, p_attr->uuid); break; case BTA_GATTC_ATTR_TYPE_INCL_SRVC: add_incl_srvc_to_gatt_db(p_srvc_cb->srvc_cache, p_attr->s_handle, p_attr->uuid, p_attr->incl_srvc_handle); break; } p_attr++; num_attr--; } } /******************************************************************************* * * Function bta_gattc_fill_nv_attr * * Description fill a NV attribute entry value * * Returns None. * ******************************************************************************/ void bta_gattc_fill_nv_attr(tBTA_GATTC_NV_ATTR* p_attr, uint8_t type, uint16_t s_handle, uint16_t e_handle, Uuid uuid, uint8_t prop, uint16_t incl_srvc_handle, bool is_primary) { p_attr->s_handle = s_handle; p_attr->e_handle = e_handle; p_attr->attr_type = type; p_attr->is_primary = is_primary; p_attr->id = 0; p_attr->prop = prop; p_attr->incl_srvc_handle = incl_srvc_handle; p_attr->uuid = uuid; } /******************************************************************************* * * Function bta_gattc_cache_save * * Description save the server cache into NV * * Returns None. * ******************************************************************************/ void bta_gattc_cache_save(tBTA_GATTC_SERV* p_srvc_cb, uint16_t conn_id) { if (p_srvc_cb->srvc_cache.empty()) return; int i = 0; size_t db_size = bta_gattc_get_db_size(p_srvc_cb->srvc_cache, 0x0000, 0xFFFF); tBTA_GATTC_NV_ATTR* nv_attr = (tBTA_GATTC_NV_ATTR*)osi_malloc(db_size * sizeof(tBTA_GATTC_NV_ATTR)); for (const tBTA_GATTC_SERVICE& service : p_srvc_cb->srvc_cache) { bta_gattc_fill_nv_attr(&nv_attr[i++], BTA_GATTC_ATTR_TYPE_SRVC, service.s_handle, service.e_handle, service.uuid, 0 /* properties */, 0 /* incl_srvc_handle */, service.is_primary); } for (const tBTA_GATTC_SERVICE& service : p_srvc_cb->srvc_cache) { for (const tBTA_GATTC_CHARACTERISTIC& charac : service.characteristics) { bta_gattc_fill_nv_attr( &nv_attr[i++], BTA_GATTC_ATTR_TYPE_CHAR, charac.value_handle, 0, charac.uuid, charac.properties, 0 /* incl_srvc_handle */, false); for (const tBTA_GATTC_DESCRIPTOR& desc : charac.descriptors) { bta_gattc_fill_nv_attr(&nv_attr[i++], BTA_GATTC_ATTR_TYPE_CHAR_DESCR, desc.handle, 0, desc.uuid, 0 /* properties */, 0 /* incl_srvc_handle */, false); } } for (const tBTA_GATTC_INCLUDED_SVC& p_isvc : service.included_svc) { bta_gattc_fill_nv_attr(&nv_attr[i++], BTA_GATTC_ATTR_TYPE_INCL_SRVC, p_isvc.handle, 0, p_isvc.uuid, 0 /* properties */, p_isvc.included_service->s_handle, false); } } bta_gattc_cache_write(p_srvc_cb->server_bda, db_size, nv_attr); osi_free(nv_attr); } /******************************************************************************* * * Function bta_gattc_cache_load * * Description Load GATT cache from storage for server. * * Parameter p_clcb: pointer to server clcb, that will * be filled from storage * Returns true on success, false otherwise * ******************************************************************************/ bool bta_gattc_cache_load(tBTA_GATTC_CLCB* p_clcb) { char fname[255] = {0}; bta_gattc_generate_cache_file_name(fname, sizeof(fname), p_clcb->p_srcb->server_bda); FILE* fd = fopen(fname, "rb"); if (!fd) { LOG(ERROR) << __func__ << ": can't open GATT cache file " << fname << " for reading, error: " << strerror(errno); return false; } uint16_t cache_ver = 0; tBTA_GATTC_NV_ATTR* attr = NULL; bool success = false; uint16_t num_attr = 0; if (fread(&cache_ver, sizeof(uint16_t), 1, fd) != 1) { LOG(ERROR) << __func__ << ": can't read GATT cache version from: " << fname; goto done; } if (cache_ver != GATT_CACHE_VERSION) { LOG(ERROR) << __func__ << ": wrong GATT cache version: " << fname; goto done; } if (fread(&num_attr, sizeof(uint16_t), 1, fd) != 1) { LOG(ERROR) << __func__ << ": can't read number of GATT attributes: " << fname; goto done; } attr = (tBTA_GATTC_NV_ATTR*)osi_malloc(sizeof(tBTA_GATTC_NV_ATTR) * num_attr); if (fread(attr, sizeof(tBTA_GATTC_NV_ATTR), num_attr, fd) != num_attr) { LOG(ERROR) << __func__ << "s: can't read GATT attributes: " << fname; goto done; } bta_gattc_rebuild_cache(p_clcb->p_srcb, num_attr, attr); success = true; done: osi_free(attr); fclose(fd); return success; } /******************************************************************************* * * Function bta_gattc_cache_write * * Description This callout function is executed by GATT when a server * cache is available to save. * * Parameter server_bda: server bd address of this cache belongs to * num_attr: number of attribute to be save. * attr: pointer to the list of attributes to save. * Returns * ******************************************************************************/ static void bta_gattc_cache_write(const RawAddress& server_bda, uint16_t num_attr, tBTA_GATTC_NV_ATTR* attr) { char fname[255] = {0}; bta_gattc_generate_cache_file_name(fname, sizeof(fname), server_bda); FILE* fd = fopen(fname, "wb"); if (!fd) { LOG(ERROR) << __func__ << ": can't open GATT cache file for writing: " << fname; return; } uint16_t cache_ver = GATT_CACHE_VERSION; if (fwrite(&cache_ver, sizeof(uint16_t), 1, fd) != 1) { LOG(ERROR) << __func__ << ": can't write GATT cache version: " << fname; fclose(fd); return; } if (fwrite(&num_attr, sizeof(uint16_t), 1, fd) != 1) { LOG(ERROR) << __func__ << ": can't write GATT cache attribute count: " << fname; fclose(fd); return; } if (fwrite(attr, sizeof(tBTA_GATTC_NV_ATTR), num_attr, fd) != num_attr) { LOG(ERROR) << __func__ << ": can't write GATT cache attributes: " << fname; fclose(fd); return; } fclose(fd); } /******************************************************************************* * * Function bta_gattc_cache_reset * * Description This callout function is executed by GATTC to reset cache in * application * * Parameter server_bda: server bd address of this cache belongs to * * Returns void. * ******************************************************************************/ void bta_gattc_cache_reset(const RawAddress& server_bda) { VLOG(1) << __func__; char fname[255] = {0}; bta_gattc_generate_cache_file_name(fname, sizeof(fname), server_bda); unlink(fname); }