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/******************************************************************************
*
* Copyright 2020 The Android Open Source Project
*
* 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.
*
******************************************************************************/
#include <base/strings/string_number_conversions.h>
#include <list>
#include "gatt_int.h"
#include "stack/crypto_toolbox/crypto_toolbox.h"
using bluetooth::Uuid;
static size_t calculate_database_info_size(std::list<tGATT_SRV_LIST_ELEM>* lst_ptr) {
size_t len = 0;
auto srv_it = lst_ptr->begin();
for (; srv_it != lst_ptr->end(); srv_it++) {
auto attr_list = &srv_it->p_db->attr_list;
auto attr_it = attr_list->begin();
for (; attr_it != attr_list->end(); attr_it++) {
if (attr_it->uuid == Uuid::From16Bit(GATT_UUID_PRI_SERVICE) ||
attr_it->uuid == Uuid::From16Bit(GATT_UUID_SEC_SERVICE)) {
// Service declaration (Handle + Type + Value)
len += 4 + gatt_build_uuid_to_stream_len(attr_it->p_value->uuid);
} else if (attr_it->uuid == Uuid::From16Bit(GATT_UUID_INCLUDE_SERVICE)){
// Included service declaration (Handle + Type + Value)
len += 8 + gatt_build_uuid_to_stream_len(attr_it->p_value->incl_handle.service_type);
} else if (attr_it->uuid == Uuid::From16Bit(GATT_UUID_CHAR_DECLARE)) {
// Characteristic declaration (Handle + Type + Value)
len += 7 + gatt_build_uuid_to_stream_len((++attr_it)->uuid);
} else if (attr_it->uuid == Uuid::From16Bit(GATT_UUID_CHAR_DESCRIPTION) ||
attr_it->uuid == Uuid::From16Bit(GATT_UUID_CHAR_CLIENT_CONFIG) ||
attr_it->uuid == Uuid::From16Bit(GATT_UUID_CHAR_SRVR_CONFIG) ||
attr_it->uuid == Uuid::From16Bit(GATT_UUID_CHAR_PRESENT_FORMAT) ||
attr_it->uuid == Uuid::From16Bit(GATT_UUID_CHAR_AGG_FORMAT)) {
// Descriptor (Handle + Type)
len += 4;
} else if (attr_it->uuid == Uuid::From16Bit(GATT_UUID_CHAR_EXT_PROP)) {
// Descriptor for ext property (Handle + Type + Value)
len += 6;
}
}
}
return len;
}
static void fill_database_info(std::list<tGATT_SRV_LIST_ELEM>* lst_ptr, uint8_t* p_data) {
auto srv_it = lst_ptr->begin();
for (; srv_it != lst_ptr->end(); srv_it++) {
auto attr_list = &srv_it->p_db->attr_list;
auto attr_it = attr_list->begin();
for (; attr_it != attr_list->end(); attr_it++) {
if (attr_it->uuid == Uuid::From16Bit(GATT_UUID_PRI_SERVICE) ||
attr_it->uuid == Uuid::From16Bit(GATT_UUID_SEC_SERVICE)) {
// Service declaration
UINT16_TO_STREAM(p_data, attr_it->handle);
if (srv_it->is_primary) {
UINT16_TO_STREAM(p_data, GATT_UUID_PRI_SERVICE);
} else {
UINT16_TO_STREAM(p_data, GATT_UUID_SEC_SERVICE);
}
gatt_build_uuid_to_stream(&p_data, attr_it->p_value->uuid);
} else if (attr_it->uuid == Uuid::From16Bit(GATT_UUID_INCLUDE_SERVICE)){
// Included service declaration
UINT16_TO_STREAM(p_data, attr_it->handle);
UINT16_TO_STREAM(p_data, GATT_UUID_INCLUDE_SERVICE);
UINT16_TO_STREAM(p_data, attr_it->p_value->incl_handle.s_handle);
UINT16_TO_STREAM(p_data, attr_it->p_value->incl_handle.e_handle);
gatt_build_uuid_to_stream(&p_data, attr_it->p_value->incl_handle.service_type);
} else if (attr_it->uuid == Uuid::From16Bit(GATT_UUID_CHAR_DECLARE)) {
// Characteristic declaration
UINT16_TO_STREAM(p_data, attr_it->handle);
UINT16_TO_STREAM(p_data, GATT_UUID_CHAR_DECLARE);
UINT8_TO_STREAM(p_data, attr_it->p_value->char_decl.property);
UINT16_TO_STREAM(p_data, attr_it->p_value->char_decl.char_val_handle);
// Increment 1 to fetch characteristic uuid from value declaration attribute
gatt_build_uuid_to_stream(&p_data, (++attr_it)->uuid);
} else if (attr_it->uuid == Uuid::From16Bit(GATT_UUID_CHAR_DESCRIPTION) ||
attr_it->uuid == Uuid::From16Bit(GATT_UUID_CHAR_CLIENT_CONFIG) ||
attr_it->uuid == Uuid::From16Bit(GATT_UUID_CHAR_SRVR_CONFIG) ||
attr_it->uuid == Uuid::From16Bit(GATT_UUID_CHAR_PRESENT_FORMAT) ||
attr_it->uuid == Uuid::From16Bit(GATT_UUID_CHAR_AGG_FORMAT)) {
// Descriptor
UINT16_TO_STREAM(p_data, attr_it->handle);
UINT16_TO_STREAM(p_data, attr_it->uuid.As16Bit());
} else if (attr_it->uuid == Uuid::From16Bit(GATT_UUID_CHAR_EXT_PROP)) {
// Descriptor
UINT16_TO_STREAM(p_data, attr_it->handle);
UINT16_TO_STREAM(p_data, attr_it->uuid.As16Bit());
UINT16_TO_STREAM(p_data, attr_it->p_value
? attr_it->p_value->char_ext_prop
: 0x0000);
}
}
}
}
Octet16 gatts_calculate_database_hash(std::list<tGATT_SRV_LIST_ELEM>* lst_ptr) {
int len = calculate_database_info_size(lst_ptr);
std::vector<uint8_t> serialized(len);
fill_database_info(lst_ptr, serialized.data());
std::reverse(serialized.begin(), serialized.end());
Octet16 db_hash = crypto_toolbox::aes_cmac(Octet16{0}, serialized.data(),
serialized.size());
LOG(INFO) << __func__ << ": hash="
<< base::HexEncode(db_hash.data(), db_hash.size());
return db_hash;
}
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