Add PacketOrderK

src/main/java/ac/grim/grimac/checks/impl/packetorder/PacketOrderK.java

@@ -0,0 +1,65 @@
+package ac.grim.grimac.checks.impl.packetorder;
+
+import ac.grim.grimac.checks.Check;
+import ac.grim.grimac.checks.CheckData;
+import ac.grim.grimac.checks.type.PostPredictionCheck;
+import ac.grim.grimac.player.GrimPlayer;
+import ac.grim.grimac.utils.anticheat.update.PredictionComplete;
+import com.github.retrooper.packetevents.event.PacketReceiveEvent;
+import com.github.retrooper.packetevents.protocol.packettype.PacketType;
+import com.github.retrooper.packetevents.protocol.player.ClientVersion;
+import com.github.retrooper.packetevents.wrapper.play.client.WrapperPlayClientInteractEntity;
+import com.github.retrooper.packetevents.wrapper.play.client.WrapperPlayClientPlayerFlying;
+
+import java.util.ArrayDeque;
+import java.util.ArrayList;
+
+@CheckData(name = "PacketOrderK", experimental = true)
+public class PacketOrderK extends Check implements PostPredictionCheck {
+    public PacketOrderK(final GrimPlayer player) {
+        super(player);
+    }
+
+    private final ArrayDeque<String> flags = new ArrayDeque<>();
+    private int lastEntity;
+    private boolean hasInteracted = false;
+
+    @Override
+    public void onPacketReceive(PacketReceiveEvent event) {
+        if (event.getPacketType() == PacketType.Play.Client.INTERACT_ENTITY) {
+            int entity = new WrapperPlayClientInteractEntity(event).getEntityId();
+            if (hasInteracted && entity != lastEntity) {
+                String verbose = "lastEntity=" + lastEntity + ", entity=" + entity;
+                if (player.getClientVersion().isOlderThanOrEquals(ClientVersion.V_1_8)) {
+                    if (flagAndAlert(verbose) && shouldModifyPackets()) {
+                        event.setCancelled(true);
+                        player.onPacketCancel();
+                    }
+                } else {
+                    flags.add(verbose);
+                }
+            }
+            lastEntity = entity;
+            hasInteracted = true;
+        }
+
+        if (WrapperPlayClientPlayerFlying.isFlying(event.getPacketType()) && player.getClientVersion().isOlderThanOrEquals(ClientVersion.V_1_8) && !player.packetStateData.lastPacketWasTeleport) {
+            hasInteracted = false;
+        }
+    }
+
+    @Override
+    public void onPredictionComplete(PredictionComplete predictionComplete) {
+        // we don't need to check pre-1.9 players here (no tick skipping)
+        if (player.getClientVersion().isOlderThanOrEquals(ClientVersion.V_1_8)) return;
+
+        if (!player.skippedTickInActualMovement) {
+            for (String verbose : flags) {
+                flagAndAlert(verbose);
+            }
+        }
+
+        flags.clear();
+        hasInteracted = false;
+    }
+}

src/main/java/ac/grim/grimac/manager/CheckManager.java

@@ -125,6 +125,7 @@ public CheckManager(GrimPlayer player) {
                 .put(PacketOrderH.class, new PacketOrderH(player))
                 .put(PacketOrderI.class, new PacketOrderI(player))
                 .put(PacketOrderJ.class, new PacketOrderJ(player))
+                .put(PacketOrderK.class, new PacketOrderK(player))
                 .put(NoFallB.class, new NoFallB(player))
                 .put(OffsetHandler.class, new OffsetHandler(player))
                 .put(SuperDebug.class, new SuperDebug(player))