From 3634e6fefd10b173ebb5bd2c4f66e21c42090fbb Mon Sep 17 00:00:00 2001
From: Joseph Hirschfeld <joe@ibj.io>
Date: Thu, 3 Mar 2016 02:48:12 -0600
Subject: [PATCH] Add velocity warnings


diff --git a/src/main/java/org/bukkit/craftbukkit/CraftServer.java b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
index 01b1ef39f..0b7c02d36 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftServer.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
@@ -172,6 +172,7 @@ public final class CraftServer implements Server {
     private final UUID invalidUserUUID = UUID.nameUUIDFromBytes("InvalidUsername".getBytes(Charsets.UTF_8));
     private final List<CraftPlayer> playerView;
     public int reloadCount;
+    public static Exception excessiveVelEx; // Paper - Velocity warnings
 
     private final class BooleanWrapper {
         private boolean value = true;
diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftEntity.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftEntity.java
index 9cb05e067..917fa3d21 100644
--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftEntity.java
+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftEntity.java
@@ -237,6 +237,11 @@ public abstract class CraftEntity implements org.bukkit.entity.Entity {
     }
 
     public void setVelocity(Vector vel) {
+        // Paper start - Warn server owners when plugins try to set super high velocities
+        if (!(this instanceof org.bukkit.entity.Projectile) && (vel.getX() > 4 || vel.getX() < -4 || vel.getY() > 4 || vel.getY() < -4 || vel.getZ() > 4 || vel.getZ() < -4)) {
+            CraftServer.excessiveVelEx = new Exception("Excessive velocity set detected: tried to set velocity of entity #" + getEntityId() + " to (" + vel.getX() + "," + vel.getY() + "," + vel.getZ() + ").");
+        }
+        // Paper end
         entity.motX = vel.getX();
         entity.motY = vel.getY();
         entity.motZ = vel.getZ();
diff --git a/src/main/java/org/spigotmc/WatchdogThread.java b/src/main/java/org/spigotmc/WatchdogThread.java
index 3ed983cc0..6384d50e7 100644
--- a/src/main/java/org/spigotmc/WatchdogThread.java
+++ b/src/main/java/org/spigotmc/WatchdogThread.java
@@ -66,7 +66,19 @@ public class WatchdogThread extends Thread
                     log.log( Level.SEVERE, "During the run of the server, a physics stackoverflow was supressed" );
                     log.log( Level.SEVERE, "near " + net.minecraft.server.World.blockLocation);
                 }
-                //
+                // Paper start - Warn in watchdog if an excessive velocity was ever set
+                if ( org.bukkit.craftbukkit.CraftServer.excessiveVelEx != null )
+                {
+                    log.log( Level.SEVERE, "------------------------------" );
+                    log.log( Level.SEVERE, "During the run of the server, a plugin set an excessive velocity on an entity" );
+                    log.log( Level.SEVERE, "This may be the cause of the issue, or it may be entirely unrelated" );
+                    log.log( Level.SEVERE, org.bukkit.craftbukkit.CraftServer.excessiveVelEx.getMessage());
+                    for ( StackTraceElement stack : org.bukkit.craftbukkit.CraftServer.excessiveVelEx.getStackTrace() )
+                    {
+                        log.log( Level.SEVERE, "\t\t" + stack );
+                    }
+                }
+                // Paper end
                 log.log( Level.SEVERE, "------------------------------" );
                 log.log( Level.SEVERE, "Server thread dump (Look for plugins here before reporting to Paper!):" );
                 dumpThread( ManagementFactory.getThreadMXBean().getThreadInfo( MinecraftServer.getServer().primaryThread.getId(), Integer.MAX_VALUE ), log );
-- 
2.13.0