UA-.NETStandard/fuzzing/Opc.Ua.PubSub.Fuzz/FuzzableCode.Uadp.cs

/* ========================================================================
 * Copyright (c) 2005-2026 The OPC Foundation, Inc. All rights reserved.
 *
 * OPC Foundation MIT License 1.00
 *
 * Permission is hereby granted, free of charge, to any person
 * obtaining a copy of this software and associated documentation
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 * copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following
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 *
 * The above copyright notice and this permission notice shall be
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using System;
using System.IO;
using Opc.Ua.PubSub.Encoding.Uadp;

namespace Opc.Ua.Fuzzing
{
    public static partial class FuzzableCode
    {
        public static void AflfuzzUadpNetworkMessageDecode(Stream stream)
        {
            LibfuzzUadpNetworkMessageDecode(ReadCapped(stream));
        }

        public static void LibfuzzUadpNetworkMessageDecode(ReadOnlySpan<byte> input)
        {
            try
            {
                _ = UadpDecoder.Decode(CopyCapped(input), NewContext());
            }
            catch (Exception ex) when (IsExpected(ex))
            {
            }
        }

        public static void AflfuzzUadpChunkReassembly(Stream stream)
        {
            LibfuzzUadpChunkReassembly(ReadCapped(stream));
        }

        public static void LibfuzzUadpChunkReassembly(ReadOnlySpan<byte> input)
        {
            try
            {
                byte[] data = CopyCapped(input);
                using var reassembler = new UadpReassembler(TimeProvider.System);
                _ = reassembler.TryAddChunk(
                    Opc.Ua.PubSub.Encoding.PublisherId.FromUInt32(0xF00DBABEU),
                    writerGroupId: 1,
                    data,
                    out ReadOnlyMemory<byte>? reassembled);
                _ = reassembled?.Length;

                if (data.Length > 0)
                {
                    var chunker = new UadpChunker();
                    int maxFrameSize = Math.Max(UadpChunker.ChunkHeaderSize + 1, Math.Min(256, data.Length + 10));
                    foreach (byte[] chunk in chunker.Split(data, messageSequenceNumber: 1, maxFrameSize))
                    {
                        _ = reassembler.TryAddChunk(
                            Opc.Ua.PubSub.Encoding.PublisherId.FromUInt32(0xF00DBABEU),
                            writerGroupId: 1,
                            chunk,
                            out reassembled);
                    }
                }
            }
            catch (Exception ex) when (IsExpected(ex))
            {
            }
        }
    }
}