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package ftbsc.bscv.patches;
import ftbsc.lll.processor.annotations.Injector;
import ftbsc.lll.processor.annotations.Patch;
import ftbsc.lll.processor.annotations.Target;
import io.netty.channel.ChannelHandlerContext;
import io.netty.util.concurrent.GenericFutureListener;
import net.minecraft.network.IPacket;
import net.minecraft.network.NetworkManager;
import net.minecraftforge.common.MinecraftForge;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.tree.AbstractInsnNode;
import org.objectweb.asm.tree.ClassNode;
import org.objectweb.asm.tree.InsnNode;
import org.objectweb.asm.tree.JumpInsnNode;
import org.objectweb.asm.tree.LabelNode;
import org.objectweb.asm.tree.MethodInsnNode;
import org.objectweb.asm.tree.MethodNode;
import org.objectweb.asm.tree.VarInsnNode;
import ftbsc.bscv.events.PacketEvent;
import ftbsc.lll.IInjector;
import ftbsc.lll.tools.DescriptorBuilder;
import ftbsc.lll.tools.InsnSequence;
import ftbsc.lll.tools.PatternMatcher;
public class PacketPatch {
public static class PacketHook {
public static boolean pktIn(IPacket<?> pkt) {
return MinecraftForge.EVENT_BUS.post(new PacketEvent(pkt, false));
}
public static boolean pktOut(IPacket<?> pkt) {
return MinecraftForge.EVENT_BUS.post(new PacketEvent(pkt, true));
}
}
@Patch(value = NetworkManager.class, reason = "add hook to intercept and alter/cancel incoming packets")
public abstract static class IncomingPacketInterceptor implements Opcodes {
@Target
@SuppressWarnings("rawtypes")
public abstract void channelRead0(ChannelHandlerContext ctx, IPacket pak);
@Injector
public static 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();
LabelNode skip = new LabelNode();
InsnSequence is = new InsnSequence();
is.add(new VarInsnNode(ALOAD, 2));
is.add(new MethodInsnNode(
INVOKESTATIC,
"ftbsc/bscv/patches/PacketPatch$PacketHook",
"pktIn",
"(Lnet/minecraft/network/IPacket;)Z"
));
is.add(new JumpInsnNode(IFEQ, skip));
is.add(new InsnNode(RETURN));
is.add(skip);
main.instructions.insert(found, is);
}
}
@Patch(value = NetworkManager.class, reason = "add hook to intercept and alter/cancel outgoing packets")
public abstract static class OutgoingPacketInterceptor implements Opcodes {
@Target
@SuppressWarnings("rawtypes")
public abstract void sendPacket(IPacket pak, GenericFutureListener gfl);
@Injector
public static void inject(ClassNode clazz, MethodNode main) {
// hook at the top
LabelNode skip = new LabelNode();
InsnSequence is = new InsnSequence();
is.add(new VarInsnNode(ALOAD, 1));
is.add(new MethodInsnNode(
INVOKESTATIC,
"ftbsc/bscv/patches/PacketPatch$PacketHook",
"pktOut",
"(Lnet/minecraft/network/IPacket;)Z"
));
is.add(new JumpInsnNode(IFEQ, skip));
is.add(new InsnNode(RETURN));
is.add(skip);
main.instructions.insert(is);
}
}
}
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ftbsc