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package ftbsc.bscv.patches;
import ftbsc.lll.processor.annotations.Find;
import ftbsc.lll.processor.annotations.Injector;
import ftbsc.lll.processor.annotations.Patch;
import ftbsc.lll.processor.annotations.Target;
import ftbsc.lll.proxies.MethodProxy;
import ftbsc.lll.tools.InsnSequence;
import ftbsc.lll.tools.PatternMatcher;
import ftbsc.lll.tools.debug.BytecodePrinter;
import ftbsc.lll.tools.nodes.MethodProxyInsnNode;
import io.netty.channel.ChannelHandlerContext;
import io.netty.util.concurrent.Future;
import io.netty.util.concurrent.GenericFutureListener;
import net.minecraft.network.IPacket;
import net.minecraft.network.NetworkManager;
import net.minecraftforge.common.MinecraftForge;
import net.minecraftforge.eventbus.api.Cancelable;
import net.minecraftforge.eventbus.api.Event;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.tree.*;
public class PacketPatch {
public static class PacketEvent {
@Cancelable
public static class Outgoing extends Event {
public final IPacket<?> packet;
public Outgoing(IPacket<?> packet) {
this.packet = packet;
}
}
@Cancelable
public static class Incoming extends Event {
public final IPacket<?> packet;
public Incoming(IPacket<?> packet) {
this.packet = packet;
}
}
}
public static boolean pktIn(IPacket<?> pkt) {
return MinecraftForge.EVENT_BUS.post(new PacketEvent.Incoming(pkt));
}
public static boolean pktOut(IPacket<?> pkt) {
return MinecraftForge.EVENT_BUS.post(new PacketEvent.Outgoing(pkt));
}
@Patch(value = NetworkManager.class, reason = "add hook to intercept and alter/cancel incoming packets")
public abstract static class IncomingPacketInterceptor implements Opcodes {
@Find(parent = PacketPatch.class)
abstract MethodProxy pktIn();
@Target
public abstract void channelRead0(ChannelHandlerContext ctx, IPacket<?> pak);
@Injector
public void inject(ClassNode clazz, MethodNode main) {
AbstractInsnNode found = PatternMatcher.builder()
.opcodes(ALOAD, GETFIELD, INVOKEINTERFACE, IFEQ)
.ignoreFrames()
.ignoreLabels()
.ignoreLineNumbers()
.build()
.find(main)
.getLast();
LabelNode skip = new LabelNode();
InsnSequence is = new InsnSequence();
is.add(new VarInsnNode(ALOAD, 2));
is.add(new MethodProxyInsnNode(INVOKESTATIC, pktIn()));
is.add(new JumpInsnNode(IFEQ, skip));
is.add(new InsnNode(RETURN));
is.add(skip);
main.instructions.insert(found, is);
}
}
@Patch(value = NetworkManager.class, reason = "add hook to intercept and alter/cancel outgoing packets")
public abstract static class OutgoingPacketInterceptor implements Opcodes {
@Find(parent = PacketPatch.class)
abstract MethodProxy pktOut();
@Target
public abstract void sendPacket(IPacket<?> pak, GenericFutureListener<? extends Future<? super Void>> gfl);
@Injector
public void inject(ClassNode clazz, MethodNode main) {
// hook at the top
LabelNode skip = new LabelNode();
InsnSequence is = new InsnSequence();
is.add(new VarInsnNode(ALOAD, 1));
is.add(new MethodProxyInsnNode(INVOKESTATIC, pktOut()));
is.add(new JumpInsnNode(IFEQ, skip));
is.add(new InsnNode(RETURN));
is.add(skip);
main.instructions.insert(is);
}
}
}
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ftbsc