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129 lines
5.7 KiB
129 lines
5.7 KiB
/******************************************************************************
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*
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* Copyright 2020 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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******************************************************************************/
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#include <base/strings/string_number_conversions.h>
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#include <list>
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#include "gatt_int.h"
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#include "stack/crypto_toolbox/crypto_toolbox.h"
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using bluetooth::Uuid;
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static size_t calculate_database_info_size(std::list<tGATT_SRV_LIST_ELEM>* lst_ptr) {
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size_t len = 0;
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auto srv_it = lst_ptr->begin();
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for (; srv_it != lst_ptr->end(); srv_it++) {
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auto attr_list = &srv_it->p_db->attr_list;
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auto attr_it = attr_list->begin();
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for (; attr_it != attr_list->end(); attr_it++) {
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if (attr_it->uuid == Uuid::From16Bit(GATT_UUID_PRI_SERVICE) ||
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attr_it->uuid == Uuid::From16Bit(GATT_UUID_SEC_SERVICE)) {
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// Service declaration (Handle + Type + Value)
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len += 4 + gatt_build_uuid_to_stream_len(attr_it->p_value->uuid);
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} else if (attr_it->uuid == Uuid::From16Bit(GATT_UUID_INCLUDE_SERVICE)){
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// Included service declaration (Handle + Type + Value)
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len += 8 + gatt_build_uuid_to_stream_len(attr_it->p_value->incl_handle.service_type);
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} else if (attr_it->uuid == Uuid::From16Bit(GATT_UUID_CHAR_DECLARE)) {
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// Characteristic declaration (Handle + Type + Value)
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len += 7 + gatt_build_uuid_to_stream_len((++attr_it)->uuid);
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} else if (attr_it->uuid == Uuid::From16Bit(GATT_UUID_CHAR_DESCRIPTION) ||
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attr_it->uuid == Uuid::From16Bit(GATT_UUID_CHAR_CLIENT_CONFIG) ||
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attr_it->uuid == Uuid::From16Bit(GATT_UUID_CHAR_SRVR_CONFIG) ||
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attr_it->uuid == Uuid::From16Bit(GATT_UUID_CHAR_PRESENT_FORMAT) ||
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attr_it->uuid == Uuid::From16Bit(GATT_UUID_CHAR_AGG_FORMAT)) {
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// Descriptor (Handle + Type)
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len += 4;
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} else if (attr_it->uuid == Uuid::From16Bit(GATT_UUID_CHAR_EXT_PROP)) {
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// Descriptor for ext property (Handle + Type + Value)
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len += 6;
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}
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}
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}
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return len;
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}
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static void fill_database_info(std::list<tGATT_SRV_LIST_ELEM>* lst_ptr, uint8_t* p_data) {
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auto srv_it = lst_ptr->begin();
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for (; srv_it != lst_ptr->end(); srv_it++) {
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auto attr_list = &srv_it->p_db->attr_list;
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auto attr_it = attr_list->begin();
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for (; attr_it != attr_list->end(); attr_it++) {
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if (attr_it->uuid == Uuid::From16Bit(GATT_UUID_PRI_SERVICE) ||
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attr_it->uuid == Uuid::From16Bit(GATT_UUID_SEC_SERVICE)) {
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// Service declaration
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UINT16_TO_STREAM(p_data, attr_it->handle);
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if (srv_it->is_primary) {
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UINT16_TO_STREAM(p_data, GATT_UUID_PRI_SERVICE);
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} else {
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UINT16_TO_STREAM(p_data, GATT_UUID_SEC_SERVICE);
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}
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gatt_build_uuid_to_stream(&p_data, attr_it->p_value->uuid);
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} else if (attr_it->uuid == Uuid::From16Bit(GATT_UUID_INCLUDE_SERVICE)){
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// Included service declaration
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UINT16_TO_STREAM(p_data, attr_it->handle);
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UINT16_TO_STREAM(p_data, GATT_UUID_INCLUDE_SERVICE);
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UINT16_TO_STREAM(p_data, attr_it->p_value->incl_handle.s_handle);
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UINT16_TO_STREAM(p_data, attr_it->p_value->incl_handle.e_handle);
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gatt_build_uuid_to_stream(&p_data, attr_it->p_value->incl_handle.service_type);
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} else if (attr_it->uuid == Uuid::From16Bit(GATT_UUID_CHAR_DECLARE)) {
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// Characteristic declaration
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UINT16_TO_STREAM(p_data, attr_it->handle);
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UINT16_TO_STREAM(p_data, GATT_UUID_CHAR_DECLARE);
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UINT8_TO_STREAM(p_data, attr_it->p_value->char_decl.property);
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UINT16_TO_STREAM(p_data, attr_it->p_value->char_decl.char_val_handle);
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// Increment 1 to fetch characteristic uuid from value declaration attribute
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gatt_build_uuid_to_stream(&p_data, (++attr_it)->uuid);
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} else if (attr_it->uuid == Uuid::From16Bit(GATT_UUID_CHAR_DESCRIPTION) ||
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attr_it->uuid == Uuid::From16Bit(GATT_UUID_CHAR_CLIENT_CONFIG) ||
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attr_it->uuid == Uuid::From16Bit(GATT_UUID_CHAR_SRVR_CONFIG) ||
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attr_it->uuid == Uuid::From16Bit(GATT_UUID_CHAR_PRESENT_FORMAT) ||
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attr_it->uuid == Uuid::From16Bit(GATT_UUID_CHAR_AGG_FORMAT)) {
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// Descriptor
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UINT16_TO_STREAM(p_data, attr_it->handle);
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UINT16_TO_STREAM(p_data, attr_it->uuid.As16Bit());
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} else if (attr_it->uuid == Uuid::From16Bit(GATT_UUID_CHAR_EXT_PROP)) {
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// Descriptor
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UINT16_TO_STREAM(p_data, attr_it->handle);
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UINT16_TO_STREAM(p_data, attr_it->uuid.As16Bit());
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UINT16_TO_STREAM(p_data, attr_it->p_value
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? attr_it->p_value->char_ext_prop
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: 0x0000);
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}
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}
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}
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}
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Octet16 gatts_calculate_database_hash(std::list<tGATT_SRV_LIST_ELEM>* lst_ptr) {
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int len = calculate_database_info_size(lst_ptr);
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std::vector<uint8_t> serialized(len);
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fill_database_info(lst_ptr, serialized.data());
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std::reverse(serialized.begin(), serialized.end());
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Octet16 db_hash = crypto_toolbox::aes_cmac(Octet16{0}, serialized.data(),
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serialized.size());
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LOG(INFO) << __func__ << ": hash="
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<< base::HexEncode(db_hash.data(), db_hash.size());
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return db_hash;
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}
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