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feat: initial work on packet patch

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ftbsc 2023-02-08 00:10:31 +01:00
parent 0591511859
commit 382e57a2cf
4 changed files with 78 additions and 54 deletions
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2
build.gradle
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@ -88,7 +88,7 @@ sourceSets.main.resources { srcDir 'src/generated/resources' }
dependencies {
minecraft "net.minecraftforge:forge:${minecraftVersion}-${forgeVersion}"
implementation 'ftbsc:lll:0.0.3'
implementation 'ftbsc:lll:0.1.1'
}
jar {

76
src/main/java/ftbsc/bscv/patches/PacketPatch.java Normal file
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@ -0,0 +1,76 @@
package ftbsc.bscv.patches;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.tree.AbstractInsnNode;
import org.objectweb.asm.tree.ClassNode;
import org.objectweb.asm.tree.InsnList;
import org.objectweb.asm.tree.InsnNode;
import org.objectweb.asm.tree.MethodInsnNode;
import org.objectweb.asm.tree.MethodNode;
import org.objectweb.asm.tree.VarInsnNode;
import ftbsc.bscv.BoSCoVicino;
import ftbsc.lll.IInjector;
import ftbsc.lll.tools.DescriptorBuilder;
import ftbsc.lll.tools.InsnSequence;
import ftbsc.lll.tools.PatternMatcher;
import net.minecraft.network.IPacket;
public class PacketPatch {
public static class LazyPacketCatcher {
private static LazyPacketCatcher INSTANCE = new LazyPacketCatcher();
public static LazyPacketCatcher getInstance() {
return LazyPacketCatcher.INSTANCE;
}
public void debug_pkt(IPacket<?> pkt) {
BoSCoVicino.LOGGER.info("got pkt : {}", pkt.toString());
}
public static void debug_static_pkt(IPacket<?> pkt) {
BoSCoVicino.LOGGER.info("got pkt : {}", pkt.toString());
}
}
public static class IncomingPacketInterceptor implements IInjector, Opcodes {
public String name() { return "IncomingPacketInterceptor"; }
public String reason() { return "add hook to intercept and alter/cancel incoming packets"; }
public String targetClass() { return "net.minecraft.network.NetworkManager"; }
public String methodName() { return "channelRead0"; }
public String methodDesc() {
return
new DescriptorBuilder()
.setReturnType(void.class)
.addParameter("io.netty.channel.ChannelHandlerContext")
.addParameter("net.minecraft.network.IPacket")
.build();
}
public void inject(ClassNode clazz, MethodNode main) {
// ALOAD, GETFIELD, INVOKEINTERFACE, IFEQ
AbstractInsnNode found = PatternMatcher.builder()
.opcodes(ALOAD, GETFIELD, INVOKEINTERFACE, IFEQ)
.ignoreFrames()
.ignoreLabels()
.ignoreLineNumbers()
.build()
.find(main)
.getLast();
InsnSequence is = new InsnSequence();
is.add(new VarInsnNode(ALOAD, 2));
is.add(new MethodInsnNode(
INVOKESTATIC,
"ftbsc/bscv/patches/PacketPatch$LazyPacketCatcher",
"debug_static_pkt",
new DescriptorBuilder().addParameter("net.minecraft.network.IPacket").build()
));
main.instructions.insert(found, is);
}
}
}

51
src/main/java/ftbsc/bscv/patches/TestPatch.java
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@ -1,51 +0,0 @@
package ftbsc.bscv.patches;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.tree.ClassNode;
import org.objectweb.asm.tree.InsnList;
import org.objectweb.asm.tree.InsnNode;
import org.objectweb.asm.tree.MethodNode;
import ftbsc.lll.IInjector;
/**
* When working as intended, this patch will crash the game
* as soon it finished loading with a NegativeArraySizeException.
*/
public class TestPatch {
public static class FramerateFix implements IInjector, Opcodes {
public String name() { return "FramerateFix"; }
public String targetClass() { return "net.minecraft.client.Minecraft"; }
public String methodName() { return "func_213243_aC"; } // getFramerateLimit()
public String methodDesc() { return "()I"; }
public void inject(ClassNode clazz, MethodNode main) {
// InsnList insnList = new InsnList();
// insnList.add(new InsnNode(POP));
// main.instructions.insert(insnList);
}
}
public static class TickPatch implements IInjector, Opcodes {
public String name() { return "TickPatch"; }
public String targetClass() { return "net.minecraft.client.Minecraft"; }
public String methodName() { return "func_71407_l"; } // tick()
public String methodDesc() { return "()V"; }
public void inject(ClassNode clazz, MethodNode main) {
// InsnList insnList = new InsnList();
// insnList.add(new InsnNode(POP));
// insnList.add(new InsnNode(POP));
// insnList.add(new InsnNode(POP));
// insnList.add(new InsnNode(POP));
// insnList.add(new InsnNode(POP));
// insnList.add(new InsnNode(POP));
// insnList.add(new InsnNode(POP));
// insnList.add(new InsnNode(POP));
// main.instructions.insert(insnList);
}
}
}

3
src/main/resources/META-INF/services/ftbsc.lll.IInjector
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@ -1,2 +1 @@
ftbsc.bscv.patches.TestPatch$FramerateFix
ftbsc.bscv.patches.TestPatch$TickPatch
ftbsc.bscv.patches.PacketPatch$IncomingPacketInterceptor