From a48c7b312795329b42df69488a4cdf6664760005 Mon Sep 17 00:00:00 2001
From: Soda5601 <62250232+ThebestkillerTBK@users.noreply.github.com>
Date: Sun, 12 Feb 2023 00:08:42 +0800
Subject: [PATCH] AntiCrash (#225)

---
 README.md                                     |  1 +
 .../anticope/rejects/MeteorRejectsAddon.java  |  1 +
 .../anticope/rejects/modules/AntiCrash.java   | 61 +++++++++++++++++++
 3 files changed, 63 insertions(+)
 create mode 100644 src/main/java/anticope/rejects/modules/AntiCrash.java

diff --git a/README.md b/README.md
index 174449b..4f83f03 100644
--- a/README.md
+++ b/README.md
@@ -32,6 +32,7 @@
 # Features
 ## Modules
 - AntiBot (Removed from Meteor in [166fc](https://github.com/MeteorDevelopment/meteor-client/commit/166fccc73e53de6cfdbe41ea58dc593a2f5011f6))
+- AntiCrash (Ported from [Anti-ClientCrasher](https://github.com/wagyourtail/Anti-ClientCrasher))
 - AntiSpawnpoint
 - AntiVanish
 - ArrowDmg (Ported from [Wurst](https://github.com/Wurst-Imperium/Wurst7/tree))
diff --git a/src/main/java/anticope/rejects/MeteorRejectsAddon.java b/src/main/java/anticope/rejects/MeteorRejectsAddon.java
index ddd39a6..016bafd 100644
--- a/src/main/java/anticope/rejects/MeteorRejectsAddon.java
+++ b/src/main/java/anticope/rejects/MeteorRejectsAddon.java
@@ -33,6 +33,7 @@ public class MeteorRejectsAddon extends MeteorAddon {
         // Modules
         Modules modules = Modules.get();
         modules.add(new AntiBot());
+        modules.add(new AntiCrash());
         modules.add(new AntiSpawnpoint());
         modules.add(new AntiVanish());
         modules.add(new ArrowDmg());
diff --git a/src/main/java/anticope/rejects/modules/AntiCrash.java b/src/main/java/anticope/rejects/modules/AntiCrash.java
new file mode 100644
index 0000000..166ea91
--- /dev/null
+++ b/src/main/java/anticope/rejects/modules/AntiCrash.java
@@ -0,0 +1,61 @@
+package anticope.rejects.modules;
+
+import anticope.rejects.MeteorRejectsAddon;
+import meteordevelopment.meteorclient.events.packets.PacketEvent;
+import meteordevelopment.meteorclient.settings.BoolSetting;
+import meteordevelopment.meteorclient.settings.Setting;
+import meteordevelopment.meteorclient.settings.SettingGroup;
+import meteordevelopment.meteorclient.systems.modules.Module;
+import meteordevelopment.orbit.EventHandler;
+import net.minecraft.network.packet.s2c.play.EntityVelocityUpdateS2CPacket;
+import net.minecraft.network.packet.s2c.play.ExplosionS2CPacket;
+import net.minecraft.network.packet.s2c.play.ParticleS2CPacket;
+import net.minecraft.network.packet.s2c.play.PlayerPositionLookS2CPacket;
+
+public class AntiCrash extends Module {
+    private final SettingGroup sgGeneral = settings.getDefaultGroup();
+
+    private final Setting<Boolean> log = sgGeneral.add(new BoolSetting.Builder()
+            .name("log")
+            .description("Logs when crash packet detected.")
+            .defaultValue(false)
+            .build()
+    );
+
+    public AntiCrash() {
+        super(MeteorRejectsAddon.CATEGORY, "anti-crash", "Attempts to cancel packets that may crash the client.");
+    }
+
+    @EventHandler
+    private void onPacketReceive(PacketEvent.Receive event) {
+        if (event.packet instanceof ExplosionS2CPacket packet) {
+            if (/* outside of world */ packet.getX() > 30_000_000 || packet.getY() > 30_000_000 || packet.getZ() > 30_000_000 || packet.getX() < -30_000_000 || packet.getY() < -30_000_000 || packet.getZ() < -30_000_000 ||
+                    // power too high
+                    packet.getRadius() > 1000 ||
+                    // too many blocks
+                    packet.getAffectedBlocks().size() > 100_000 ||
+                    // too much knockback
+                    packet.getPlayerVelocityX() > 30_000_000 || packet.getPlayerVelocityY() > 30_000_000 || packet.getPlayerVelocityZ() > 30_000_000
+                    // knockback can be negative?
+                    || packet.getPlayerVelocityX() < -30_000_000 || packet.getPlayerVelocityY() < -30_000_000 || packet.getPlayerVelocityZ() < -30_000_000
+            ) cancel(event);
+        } else if (event.packet instanceof ParticleS2CPacket packet) {
+            // too many particles
+            if (packet.getCount() > 100_000) cancel(event);
+        } else if (event.packet instanceof PlayerPositionLookS2CPacket packet) {
+            // out of world movement
+            if (packet.getX() > 30_000_000 || packet.getY() > 30_000_000 || packet.getZ() > 30_000_000 || packet.getX() < -30_000_000 || packet.getY() < -30_000_000 || packet.getZ() < -30_000_000)
+                cancel(event);
+        } else if (event.packet instanceof EntityVelocityUpdateS2CPacket packet) {
+            // velocity
+            if (packet.getVelocityX() > 30_000_000 || packet.getVelocityY() > 30_000_000 || packet.getVelocityZ() > 30_000_000
+                    || packet.getVelocityX() < -30_000_000 || packet.getVelocityY() < -30_000_000 || packet.getVelocityZ() < -30_000_000
+            ) cancel(event);
+        }
+    }
+
+    private void cancel(PacketEvent.Receive event) {
+        if (log.get()) warning("Server attempts to crash you");
+        event.cancel();
+    }
+}