src/lib/format/tests/FuzzPayloadDecoder.cpp

/*
 *
 *    Copyright (c) 2020-2021 Project CHIP Authors
 *    All rights reserved.
 *
 *    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 <cstddef>
#include <cstdint>
#include <lib/format/protocol_decoder.h>
#include <lib/support/StringBuilder.h>

#include <tlv/meta/clusters_meta.h>
#include <tlv/meta/protocols_meta.h>

namespace {

using namespace chip::Decoders;
using namespace chip::FlatTree;
using namespace chip::TLV;
using namespace chip::TLVMeta;

void RunDecode(const PayloadDecoderInitParams & params, chip::ByteSpan payload)
{
    chip::Decoders::PayloadDecoder<64, 128> decoder(params);

    decoder.StartDecoding(payload);

    PayloadEntry entry;
    while (decoder.Next(entry))
    {
        // Nothing to do ...
    }
}

} // namespace

extern "C" int LLVMFuzzerTestOneInput(const uint8_t * data, size_t len)
{
    PayloadDecoderInitParams params;
    params.SetProtocolDecodeTree(chip::TLVMeta::protocols_meta).SetClusterDecodeTree(chip::TLVMeta::clusters_meta);

    chip::ByteSpan payload(data, len);

    // Try all possible IM types (including an invalid one)
    params.SetProtocol(chip::Protocols::InteractionModel::Id);
    for (uint8_t messageType = 0; messageType < 11; messageType++)
    {
        RunDecode(params.SetMessageType(messageType), payload);
    }

    // Try some SC variants
    params.SetProtocol(chip::Protocols::SecureChannel::Id);
    RunDecode(params.SetMessageType(0), payload);
    RunDecode(params.SetMessageType(1), payload);
    RunDecode(params.SetMessageType(2), payload);
    RunDecode(params.SetMessageType(10), payload);
    RunDecode(params.SetMessageType(11), payload);
    RunDecode(params.SetMessageType(20), payload);
    RunDecode(params.SetMessageType(32), payload);
    RunDecode(params.SetMessageType(33), payload);

    params.SetProtocol(chip::Protocols::BDX::Id);
    RunDecode(params.SetMessageType(1), payload);
    RunDecode(params.SetMessageType(2), payload);
    RunDecode(params.SetMessageType(3), payload);

    return 0;
}