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// Copyright (C) 2020-2021 Bayerische Motoren Werke Aktiengesellschaft (BMW AG)
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
#include <iomanip>
#include <vsomeip/internal/logger.hpp>
#include "../../../../include/e2e/profile/profile04/checker.hpp"
#include "../../../../../utility/include/byteorder.hpp"
namespace vsomeip_v3 {
namespace e2e {
namespace profile04 {
// [SWS_E2E_00355]
void profile_04_checker::check(const e2e_buffer &_buffer, instance_t _instance,
e2e::profile_interface::check_status_t &_generic_check_status) {
std::lock_guard<std::mutex> lock(check_mutex_);
_generic_check_status = e2e::profile_interface::generic_check_status::E2E_ERROR;
if (_instance > VSOMEIP_E2E_PROFILE04_MAX_INSTANCE) {
VSOMEIP_ERROR << "E2E Profile 4 can only be used for instances [1-255]";
return;
}
/** @req [SWS_E2E_356] */
if (verify_input(_buffer)) {
/** @req [SWS_E2E_357] */
uint16_t its_received_length;
if (read_16(_buffer, its_received_length, 0)) {
/** @req [SWS_E2E_358] */
uint16_t its_received_counter;
if (read_16(_buffer, its_received_counter, 2)) {
/** @req [SWS_E2E_359] */
uint32_t its_received_data_id;
if (read_32(_buffer, its_received_data_id, 4)) {
/** @req [SWS_E2E_360] */
uint32_t its_received_crc;
if (read_32(_buffer, its_received_crc, 8)) {
uint32_t its_crc = profile_04::compute_crc(config_, _buffer);
/** @req [SWS_E2E_361] */
if (its_received_crc != its_crc) {
_generic_check_status = e2e::profile_interface::generic_check_status::E2E_WRONG_CRC;
VSOMEIP_ERROR << std::hex << "E2E P04 protection: CRC32 does not match: calculated CRC: "
<< its_crc << " received CRC: " << its_received_crc;
} else {
uint32_t its_data_id(uint32_t(_instance) << 24 | config_.data_id_);
if (its_received_data_id == its_data_id
&& static_cast<size_t>(its_received_length) == _buffer.size()
&& verify_counter(_instance, its_received_counter)) {
_generic_check_status = e2e::profile_interface::generic_check_status::E2E_OK;
}
}
}
}
}
}
}
}
bool
profile_04_checker::verify_input(const e2e_buffer &_buffer) const {
auto its_length = _buffer.size();
return (its_length >= config_.min_data_length_
&& its_length <= config_.max_data_length_);
}
bool
profile_04_checker::verify_counter(instance_t _instance, uint16_t _received_counter) {
uint16_t its_delta(0);
auto find_counter = counter_.find(_instance);
if (find_counter != counter_.end()) {
uint16_t its_counter = find_counter->second;
if (its_counter < _received_counter)
its_delta = uint16_t(_received_counter - its_counter);
else
its_delta = uint16_t(uint16_t(0xffff) - its_counter + _received_counter);
} else {
counter_[_instance] = _received_counter;
}
return (its_delta <= config_.max_delta_counter_);
}
bool
profile_04_checker::read_16(const e2e_buffer &_buffer,
uint16_t &_data, size_t _index) const {
_data = VSOMEIP_BYTES_TO_WORD(_buffer[config_.offset_ + _index],
_buffer[config_.offset_ + _index + 1]);
return (true);
}
bool
profile_04_checker::read_32(const e2e_buffer &_buffer,
uint32_t &_data, size_t _index) const {
_data = VSOMEIP_BYTES_TO_LONG(_buffer[config_.offset_ + _index],
_buffer[config_.offset_ + _index + 1],
_buffer[config_.offset_ + _index + 2],
_buffer[config_.offset_ + _index + 3]);
return (true);
}
} // namespace profile01
} // namespace e2e
} // namespace vsomeip_v3
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