Paper/Spigot-Server-Patches/0052-Add-velocity-warnings.patch
Aikar 57dd397155
Updated Upstream (Bukkit/CraftBukkit)
Upstream has released updates that appears to apply and compile correctly.
This update has not been tested by PaperMC and as with ANY update, please do your own testing

Bukkit Changes:
b999860d SPIGOT-2304: Add LootGenerateEvent

CraftBukkit Changes:
77fd87e4 SPIGOT-2304: Implement LootGenerateEvent
a1a705ee SPIGOT-5566: Doused campfires & fires should call EntityChangeBlockEvent
41712edd SPIGOT-5707: PersistentDataHolder not Persistent on API dropped Item
2020-05-01 18:03:57 -04:00

93 lines
4.7 KiB
Diff

From 84dc2e6c2ae2aa9fc259b1a472cb6bd21a42b4b6 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 1cf8fd93a4..d5311eb017 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftServer.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
@@ -234,6 +234,7 @@ public final class CraftServer implements Server {
public boolean ignoreVanillaPermissions = false;
private final List<CraftPlayer> 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 5625e5bda2..1d02e9acb9 100644
--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftEntity.java
+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftEntity.java
@@ -409,10 +409,41 @@ 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 73fa74e3cc..d961000611 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 );
--
2.26.2