| /****************************************************************************** |
| * |
| * 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; |
| } |