ASM трансформер для лимита максимального размера пакета C17PacketCustomPayload

Pa4ok · 9 Фев 2021

вот так выглядит майновский класс с пакетом, который юзается форжем, мне нужно снять ограничение на размер пакета в 32кб

C17PacketCustomPayload:

public class C17PacketCustomPayload extends Packet
{
    private String field_149562_a;
    private int field_149560_b;
    private byte[] field_149561_c;
    private static final String __OBFID = "CL_00001356";

    public C17PacketCustomPayload() {}

    @SideOnly(Side.CLIENT)
    public C17PacketCustomPayload(String p_i45248_1_, ByteBuf p_i45248_2_)
    {
        this(p_i45248_1_, p_i45248_2_.array());
    }

    @SideOnly(Side.CLIENT)
    public C17PacketCustomPayload(String p_i45249_1_, byte[] p_i45249_2_)
    {
        this.field_149562_a = p_i45249_1_;
        this.field_149561_c = p_i45249_2_;

        if (p_i45249_2_ != null)
        {
            this.field_149560_b = p_i45249_2_.length;

            if (this.field_149560_b >= 32767)
            {
                throw new IllegalArgumentException("Payload may not be larger than 32k");
            }
        }
    }

    /**
     * Reads the raw packet data from the data stream.
     */
    public void readPacketData(PacketBuffer p_148837_1_) throws IOException
    {
        this.field_149562_a = p_148837_1_.readStringFromBuffer(20);
        this.field_149560_b = p_148837_1_.readShort();

        if (this.field_149560_b > 0 && this.field_149560_b < 32767)
        {
            this.field_149561_c = new byte[this.field_149560_b];
            p_148837_1_.readBytes(this.field_149561_c);
        }
    }

    /**
     * Writes the raw packet data to the data stream.
     */
    public void writePacketData(PacketBuffer p_148840_1_) throws IOException
    {
        p_148840_1_.writeStringToBuffer(this.field_149562_a);
        p_148840_1_.writeShort((short)this.field_149560_b);

        if (this.field_149561_c != null)
        {
            p_148840_1_.writeBytes(this.field_149561_c);
        }
    }

    /**
     * Passes this Packet on to the NetHandler for processing.
     */
    public void processPacket(INetHandlerPlayServer p_148833_1_)
    {
        p_148833_1_.processVanilla250Packet(this);
    }

    public String func_149559_c()
    {
        return this.field_149562_a;
    }

    public byte[] func_149558_e()
    {
        return this.field_149561_c;
    }

    /**
     * Passes this Packet on to the NetHandler for processing.
     */
    public void processPacket(INetHandler p_148833_1_)
    {
        this.processPacket((INetHandlerPlayServer)p_148833_1_);
    }
}

я вытужил из себя (ненавижу гребаный asm) вот такой трансформер

мой трансформер:

public class ClassTransformer implements IClassTransformer
{
    @Override
    public byte[] transform(String name, String transformedName, byte[] basicClass)
    {
        if(transformedName.equals("net.minecraft.network.play.client.C17PacketCustomPayload")) {
            return transformC17PacketCustomPayload(basicClass);
        }

        return basicClass;
    }

    private byte[] transformC17PacketCustomPayload(byte[] basicClass)
    {
        ClassReader cr = new ClassReader(basicClass);
        ClassWriter cw = new ClassWriter(cr, 0);

        cr.accept(new ClassVisitor(Opcodes.ASM5, cw)
        {
            @Override
            public MethodVisitor visitMethod(int access, String name, String desc, String signature, String[] exceptions)
            {
                MethodVisitor mv = super.visitMethod(access, name, desc, signature, exceptions);
                if(name.equals("<init>") && desc.equals("(Ljava/lang/String;[B)V"))
                {
                    System.out.println("mark1");
                    return new MethodVisitor(Opcodes.ASM5, mv)
                    {
                        @Override
                        public void visitIntInsn(int opcode, int operand)
                        {
                            System.out.println(opcode + " | " + operand);
                            if(opcode == Opcodes.SIPUSH && operand == 32767) {
                                System.out.println("mark2");
                                operand = 2097151;
                            }
                            super.visitIntInsn(opcode, operand);
                        }
                    };
                }
                return mv;
            }
        }, 0);

        return cw.toByteArray();
    }
}

отладка работает мне в консоль выводится

Java:

[00:25:02] [Netty Client IO #0/INFO] [STDOUT]: [ru.pa4ok.anticheat.common.asm.ClassTransformer$1:visitMethod:31]: mark1
[00:25:02] [Netty Client IO #0/INFO] [STDOUT]: [ru.pa4ok.anticheat.common.asm.ClassTransformer$1$1:visitIntInsn:37]: 17 | 32767
[00:25:02] [Netty Client IO #0/INFO] [STDOUT]: [ru.pa4ok.anticheat.common.asm.ClassTransformer$1$1:visitIntInsn:39]: mark2

после чего при попытке захода на сервер я получаю эксцепшен и уведомление на экране о макс. размере пакета 32кб

Java:

00:25:05] [Netty Client IO #1/ERROR] [FML]: NetworkDispatcher exception
java.lang.IllegalArgumentException: Payload may not be larger than 32k
    at net.minecraft.network.play.client.C17PacketCustomPayload.<init>(SourceFile:38) ~[iz.class:?]
    at cpw.mods.fml.common.network.internal.FMLProxyPacket.toC17Packet(FMLProxyPacket.java:120) ~[FMLProxyPacket.class:?]
    at cpw.mods.fml.common.network.handshake.NetworkDispatcher.write(NetworkDispatcher.java:434) ~[NetworkDispatcher.class:?]
    at io.netty.channel.DefaultChannelHandlerContext.invokeWrite(DefaultChannelHandlerContext.java:644) ~[DefaultChannelHandlerContext.class:?]
    at io.netty.channel.DefaultChannelHandlerContext.write(DefaultChannelHandlerContext.java:698) ~[DefaultChannelHandlerContext.class:?]
    at io.netty.channel.DefaultChannelHandlerContext.writeAndFlush(DefaultChannelHandlerContext.java:688) ~[DefaultChannelHandlerContext.class:?]
    at io.netty.channel.DefaultChannelHandlerContext.writeAndFlush(DefaultChannelHandlerContext.java:717) ~[DefaultChannelHandlerContext.class:?]
    at io.netty.channel.DefaultChannelPipeline.writeAndFlush(DefaultChannelPipeline.java:893) ~[DefaultChannelPipeline.class:?]
    at io.netty.channel.AbstractChannel.writeAndFlush(AbstractChannel.java:239) ~[AbstractChannel.class:?]
    at net.minecraft.network.NetworkManager.func_150732_b(NetworkManager.java:160) [ej.class:?]
    at net.minecraft.network.NetworkManager.func_150725_a(NetworkManager.java:134) [ej.class:?]
    at cpw.mods.fml.common.network.handshake.NetworkDispatcher.sendProxy(NetworkDispatcher.java:365) [NetworkDispatcher.class:?]
    at cpw.mods.fml.common.network.handshake.HandshakeInjector.write(HandshakeInjector.java:20) [HandshakeInjector.class:?]
    at io.netty.channel.DefaultChannelHandlerContext.invokeWrite(DefaultChannelHandlerContext.java:644) [DefaultChannelHandlerContext.class:?]
    at io.netty.channel.DefaultChannelHandlerContext.write(DefaultChannelHandlerContext.java:698) [DefaultChannelHandlerContext.class:?]
    at io.netty.channel.DefaultChannelHandlerContext.write(DefaultChannelHandlerContext.java:637) [DefaultChannelHandlerContext.class:?]
    at io.netty.handler.codec.MessageToMessageEncoder.write(MessageToMessageEncoder.java:102) [MessageToMessageEncoder.class:?]
    at io.netty.handler.codec.MessageToMessageCodec.write(MessageToMessageCodec.java:116) [MessageToMessageCodec.class:?]
    at io.netty.channel.DefaultChannelHandlerContext.invokeWrite(DefaultChannelHandlerContext.java:644) [DefaultChannelHandlerContext.class:?]
    at io.netty.channel.DefaultChannelHandlerContext.write(DefaultChannelHandlerContext.java:698) [DefaultChannelHandlerContext.class:?]
    at io.netty.channel.DefaultChannelHandlerContext.writeAndFlush(DefaultChannelHandlerContext.java:688) [DefaultChannelHandlerContext.class:?]
    at io.netty.channel.DefaultChannelHandlerContext.writeAndFlush(DefaultChannelHandlerContext.java:717) [DefaultChannelHandlerContext.class:?]
    at cpw.mods.fml.common.network.handshake.FMLHandshakeClientState$2.accept(FMLHandshakeClientState.java:45) [FMLHandshakeClientState$2.class:?]
    at cpw.mods.fml.common.network.handshake.FMLHandshakeClientState$2.accept(FMLHandshakeClientState.java:39) [FMLHandshakeClientState$2.class:?]
    at cpw.mods.fml.common.network.handshake.HandshakeMessageHandler.channelRead0(HandshakeMessageHandler.java:27) [HandshakeMessageHandler.class:?]
    at cpw.mods.fml.common.network.handshake.HandshakeMessageHandler.channelRead0(HandshakeMessageHandler.java:9) [HandshakeMessageHandler.class:?]
    at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:98) [SimpleChannelInboundHandler.class:?]
    at io.netty.channel.DefaultChannelHandlerContext.invokeChannelRead(DefaultChannelHandlerContext.java:337) [DefaultChannelHandlerContext.class:?]
    at io.netty.channel.DefaultChannelHandlerContext.fireChannelRead(DefaultChannelHandlerContext.java:323) [DefaultChannelHandlerContext.class:?]
    at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:103) [MessageToMessageDecoder.class:?]
    at io.netty.handler.codec.MessageToMessageCodec.channelRead(MessageToMessageCodec.java:111) [MessageToMessageCodec.class:?]
    at io.netty.channel.DefaultChannelHandlerContext.invokeChannelRead(DefaultChannelHandlerContext.java:337) [DefaultChannelHandlerContext.class:?]
    at io.netty.channel.DefaultChannelHandlerContext.fireChannelRead(DefaultChannelHandlerContext.java:323) [DefaultChannelHandlerContext.class:?]
    at cpw.mods.fml.common.network.handshake.ChannelRegistrationHandler.channelRead0(ChannelRegistrationHandler.java:32) [ChannelRegistrationHandler.class:?]
    at cpw.mods.fml.common.network.handshake.ChannelRegistrationHandler.channelRead0(ChannelRegistrationHandler.java:15) [ChannelRegistrationHandler.class:?]
    at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:98) [SimpleChannelInboundHandler.class:?]
    at io.netty.channel.DefaultChannelHandlerContext.invokeChannelRead(DefaultChannelHandlerContext.java:337) [DefaultChannelHandlerContext.class:?]
    at io.netty.channel.DefaultChannelHandlerContext.fireChannelRead(DefaultChannelHandlerContext.java:323) [DefaultChannelHandlerContext.class:?]
    at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:785) [DefaultChannelPipeline.class:?]
    at io.netty.channel.embedded.EmbeddedChannel.writeInbound(EmbeddedChannel.java:169) [EmbeddedChannel.class:?]
    at cpw.mods.fml.common.network.handshake.NetworkDispatcher.handleClientSideCustomPacket(NetworkDispatcher.java:274) [NetworkDispatcher.class:?]
    at cpw.mods.fml.common.network.handshake.NetworkDispatcher.channelRead0(NetworkDispatcher.java:202) [NetworkDispatcher.class:?]
    at cpw.mods.fml.common.network.handshake.NetworkDispatcher.channelRead0(NetworkDispatcher.java:47) [NetworkDispatcher.class:?]
    at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:98) [SimpleChannelInboundHandler.class:?]
    at io.netty.channel.DefaultChannelHandlerContext.invokeChannelRead(DefaultChannelHandlerContext.java:337) [DefaultChannelHandlerContext.class:?]
    at io.netty.channel.DefaultChannelHandlerContext.fireChannelRead(DefaultChannelHandlerContext.java:323) [DefaultChannelHandlerContext.class:?]
    at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:173) [ByteToMessageDecoder.class:?]
    at io.netty.channel.DefaultChannelHandlerContext.invokeChannelRead(DefaultChannelHandlerContext.java:337) [DefaultChannelHandlerContext.class:?]
    at io.netty.channel.DefaultChannelHandlerContext.fireChannelRead(DefaultChannelHandlerContext.java:323) [DefaultChannelHandlerContext.class:?]
    at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:173) [ByteToMessageDecoder.class:?]
    at io.netty.channel.DefaultChannelHandlerContext.invokeChannelRead(DefaultChannelHandlerContext.java:337) [DefaultChannelHandlerContext.class:?]
    at io.netty.channel.DefaultChannelHandlerContext.fireChannelRead(DefaultChannelHandlerContext.java:323) [DefaultChannelHandlerContext.class:?]
    at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:103) [MessageToMessageDecoder.class:?]
    at io.netty.channel.DefaultChannelHandlerContext.invokeChannelRead(DefaultChannelHandlerContext.java:337) [DefaultChannelHandlerContext.class:?]
    at io.netty.channel.DefaultChannelHandlerContext.fireChannelRead(DefaultChannelHandlerContext.java:323) [DefaultChannelHandlerContext.class:?]
    at io.netty.handler.timeout.ReadTimeoutHandler.channelRead(ReadTimeoutHandler.java:149) [ReadTimeoutHandler.class:?]
    at io.netty.channel.DefaultChannelHandlerContext.invokeChannelRead(DefaultChannelHandlerContext.java:337) [DefaultChannelHandlerContext.class:?]
    at io.netty.channel.DefaultChannelHandlerContext.fireChannelRead(DefaultChannelHandlerContext.java:323) [DefaultChannelHandlerContext.class:?]
    at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:785) [DefaultChannelPipeline.class:?]
    at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:100) [AbstractNioByteChannel$NioByteUnsafe.class:?]
    at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:480) [NioEventLoop.class:?]
    at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:447) [NioEventLoop.class:?]
    at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:341) [NioEventLoop.class:?]
    at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:101) [SingleThreadEventExecutor$2.class:?]
    at java.lang.Thread.run(Thread.java:748) [?:1.8.0_202]

что делать дальше я хз

NotYuki · 9 Фев 2021

gamerforEA/Minecraft-PacketUnlimiter 2 минуты поиска по форуму

Pa4ok · 9 Фев 2021

Спасибо, сам бы не догадался, лишь бы он еще это тоже делал, он отключает ограничение на передачу nbt, но никак не C17PacketCustomPayload

will0376 · 9 Фев 2021

Pa4ok написал(а):
C17PacketCustomPayload

Ну можешь попробовать на основе его асм - сделать свой.

BlesseNtumble · 9 Фев 2021

Ну так может ты превышаешь новый лимит в 2097151?
И надо еще в readPacketData менять.

Pa4ok · 9 Фев 2021

Опять же нет, потому что я отправляю 142кб, а устанавливаю 2мб

в readPacketData я тоже вижу, но эксцепшн вылетает из конструктора

tox1cozZ · 9 Фев 2021

Я делал хуками:

Java:

@Hook(returnCondition = ReturnCondition.ALWAYS)
    public static void readPacketData(C17PacketCustomPayload packet, PacketBuffer packetBuffer){
        try{
            ReflectionHelper.setPrivateValue(C17PacketCustomPayload.class, packet, packetBuffer.readStringFromBuffer(20), 0);

            int size = packetBuffer.readInt();
            ReflectionHelper.setPrivateValue(C17PacketCustomPayload.class, packet, size, 1);

            if(size > 0 && size < 0x1FFF9A){
                byte[] bytes = new byte[size];
                packetBuffer.readBytes(bytes);
                ReflectionHelper.setPrivateValue(C17PacketCustomPayload.class, packet, bytes, 2);
            }
        }catch(IOException e){
            e.printStackTrace();
        }
    }

    @Hook(returnCondition = ReturnCondition.ALWAYS)
    public static void writePacketData(C17PacketCustomPayload packet, PacketBuffer packetBuffer){
        try{
            String channel = ReflectionHelper.getPrivateValue(C17PacketCustomPayload.class, packet, 0);
            int size = ReflectionHelper.getPrivateValue(C17PacketCustomPayload.class, packet, 1);
            byte[] bytes = ReflectionHelper.getPrivateValue(C17PacketCustomPayload.class, packet, 2);

            packetBuffer.writeStringToBuffer(channel);
            packetBuffer.writeInt(size);

            if(bytes != null){
                packetBuffer.writeBytes(bytes);
            }
        }catch(IOException e){
            e.printStackTrace();
        }
    }

    @Hook(returnCondition = ReturnCondition.ALWAYS, targetMethod = "<init>")
    @SideOnly(Side.CLIENT)
    public static void C17PacketCustomPayload(C17PacketCustomPayload packet, String channel, byte[] bytes){
        ReflectionHelper.setPrivateValue(C17PacketCustomPayload.class, packet, channel, 0);
        ReflectionHelper.setPrivateValue(C17PacketCustomPayload.class, packet, bytes, 2);

        if(bytes != null){
            ReflectionHelper.setPrivateValue(C17PacketCustomPayload.class, packet, bytes.length, 1);

            if(bytes.length > 0x1FFF9A){
                throw new IllegalArgumentException("Payload may not be larger than 2097050 bytes");
            }
        }
    }

Вместо рефлексии лучше снять приваты AT'шкой, просто по своим причинам не мог использовать.

Pa4ok · 9 Фев 2021

так, как буду накрывать мод через 2 обфускатора, не хочу еще хуклибу подтаскивать, чтобы не париться с исключениями ремапа и лишний раз палиться, тк трансформировать нужно 1 класс

Pa4ok · 10 Фев 2021

up, вопрос все еще не решен, как это сделать без хуклибы, на чистом asm

ASM трансформер для лимита максимального размера пакета C17PacketCustomPayload

Pa4ok

Вложения

NotYuki

Pa4ok

Вложения

will0376

Токсичная личность

BlesseNtumble

Pa4ok

Вложения

tox1cozZ

aka Agravaine

Pa4ok

Pa4ok