From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 From: Joseph Hirschfeld 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 fd0ed7f06c338b85efc3930cfd16325331786f2c..50fe1d881e6b618aadb31ae4daa7891452a89863 100644 --- a/src/main/java/org/bukkit/craftbukkit/CraftServer.java +++ b/src/main/java/org/bukkit/craftbukkit/CraftServer.java @@ -261,6 +261,7 @@ public final class CraftServer implements Server { public boolean ignoreVanillaPermissions = false; private final List playerView; public int reloadCount; + public static Exception excessiveVelEx; // Paper - Velocity warnings static { ConfigurationSerialization.registerClass(CraftOfflinePlayer.class); diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftEntity.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftEntity.java index 10f96056700c88cc8e83477877788e3443cecefd..e7125c8a3a4b8374e3a5ea37dc097d383ba8bdc3 100644 --- a/src/main/java/org/bukkit/craftbukkit/entity/CraftEntity.java +++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftEntity.java @@ -422,10 +422,41 @@ public abstract class CraftEntity implements org.bukkit.entity.Entity { public void setVelocity(Vector velocity) { Preconditions.checkArgument(velocity != null, "velocity"); velocity.checkFinite(); + // Paper start - Warn server owners when plugins try to set super high velocities + if (!(this instanceof org.bukkit.entity.Projectile) && isUnsafeVelocity(velocity)) { + CraftServer.excessiveVelEx = new Exception("Excessive velocity set detected: tried to set velocity of entity " + entity.getName() + " id #" + getEntityId() + " to (" + velocity.getX() + "," + velocity.getY() + "," + velocity.getZ() + ")."); + } + // Paper end + entity.setMot(CraftVector.toNMS(velocity)); entity.velocityChanged = true; } + // Paper start + /** + * Checks if the given velocity is not necessarily safe in all situations. + * This function returning true does not mean the velocity is dangerous or to be avoided, only that it may be + * a detriment to performance on the server. + * + * It is not to be used as a hard rule of any sort. + * Paper only uses it to warn server owners in watchdog crashes. + * + * @param vel incoming velocity to check + * @return if the velocity has the potential to be a performance detriment + */ + private static boolean isUnsafeVelocity(Vector vel) { + final double x = vel.getX(); + final double y = vel.getY(); + final double z = vel.getZ(); + + if (x > 4 || x < -4 || y > 4 || y < -4 || z > 4 || z < -4) { + return true; + } + + return false; + } + // Paper end + @Override public double getHeight() { return getHandle().getHeight(); diff --git a/src/main/java/org/spigotmc/WatchdogThread.java b/src/main/java/org/spigotmc/WatchdogThread.java index 73fa74e3cc0239a38cd2ba41b3e9e991a5c4ebf9..d9610006113e5f67c2feeea332b2920230822d41 100644 --- a/src/main/java/org/spigotmc/WatchdogThread.java +++ b/src/main/java/org/spigotmc/WatchdogThread.java @@ -76,7 +76,19 @@ 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.lastPhysicsProblem ); } - // + // 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!):" ); // Paper dumpThread( ManagementFactory.getThreadMXBean().getThreadInfo( MinecraftServer.getServer().serverThread.getId(), Integer.MAX_VALUE ), log );