mirror of https://github.com/PaperMC/Paper.git
86 lines
4.4 KiB
Diff
86 lines
4.4 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Joseph Hirschfeld <joe@ibj.io>
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Date: Thu, 3 Mar 2016 02:48:12 -0600
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Subject: [PATCH] Add velocity warnings
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diff --git a/src/main/java/org/bukkit/craftbukkit/CraftServer.java b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
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index fa77a985087acf3398f65b58be7c1d12ea8f7f66..b7707cccbdc1b55f49cc70218949aacdceeb2651 100644
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--- a/src/main/java/org/bukkit/craftbukkit/CraftServer.java
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+++ b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
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@@ -298,6 +298,7 @@ public final class CraftServer implements Server {
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public boolean ignoreVanillaPermissions = false;
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private final List<CraftPlayer> playerView;
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public int reloadCount;
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+ public static Exception excessiveVelEx; // Paper - Velocity warnings
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static {
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ConfigurationSerialization.registerClass(CraftOfflinePlayer.class);
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diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftEntity.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftEntity.java
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index 49294a8d580d891f21d8d4cbae14ae477c01ff8d..74937603e7b8308fd314d650d9d966e8abd2c725 100644
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--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftEntity.java
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+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftEntity.java
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@@ -128,10 +128,40 @@ public abstract class CraftEntity implements org.bukkit.entity.Entity {
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public void setVelocity(Vector velocity) {
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Preconditions.checkArgument(velocity != null, "velocity");
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velocity.checkFinite();
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+ // Paper start - Warn server owners when plugins try to set super high velocities
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+ if (!(this instanceof org.bukkit.entity.Projectile || this instanceof org.bukkit.entity.Minecart) && isUnsafeVelocity(velocity)) {
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+ CraftServer.excessiveVelEx = new Exception("Excessive velocity set detected: tried to set velocity of entity " + entity.getScoreboardName() + " id #" + getEntityId() + " to (" + velocity.getX() + "," + velocity.getY() + "," + velocity.getZ() + ").");
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+ }
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+ // Paper end
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this.entity.setDeltaMovement(CraftVector.toNMS(velocity));
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this.entity.hurtMarked = true;
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}
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+ // Paper start
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+ /**
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+ * Checks if the given velocity is not necessarily safe in all situations.
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+ * This function returning true does not mean the velocity is dangerous or to be avoided, only that it may be
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+ * a detriment to performance on the server.
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+ *
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+ * It is not to be used as a hard rule of any sort.
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+ * Paper only uses it to warn server owners in watchdog crashes.
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+ *
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+ * @param vel incoming velocity to check
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+ * @return if the velocity has the potential to be a performance detriment
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+ */
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+ private static boolean isUnsafeVelocity(Vector vel) {
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+ final double x = vel.getX();
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+ final double y = vel.getY();
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+ final double z = vel.getZ();
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+
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+ if (x > 4 || x < -4 || y > 4 || y < -4 || z > 4 || z < -4) {
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+ return true;
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+ }
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+
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+ return false;
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+ }
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+ // Paper end
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+
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@Override
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public double getHeight() {
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return this.getHandle().getBbHeight();
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diff --git a/src/main/java/org/spigotmc/WatchdogThread.java b/src/main/java/org/spigotmc/WatchdogThread.java
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index 231b4e3552b17f7803815a433a5ece440c227cc6..fd3fe8f00981230f1115ad6821a6be9c9f09f7d3 100644
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--- a/src/main/java/org/spigotmc/WatchdogThread.java
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+++ b/src/main/java/org/spigotmc/WatchdogThread.java
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@@ -130,6 +130,17 @@ public class WatchdogThread extends Thread
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}
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log.log( Level.SEVERE, "\tStack:" );
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//
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+ // Paper start - Warn in watchdog if an excessive velocity was ever set
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+ if (org.bukkit.craftbukkit.CraftServer.excessiveVelEx != null) {
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+ log.log(Level.SEVERE, "------------------------------");
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+ log.log(Level.SEVERE, "During the run of the server, a plugin set an excessive velocity on an entity");
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+ log.log(Level.SEVERE, "This may be the cause of the issue, or it may be entirely unrelated");
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+ log.log(Level.SEVERE, org.bukkit.craftbukkit.CraftServer.excessiveVelEx.getMessage());
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+ for (StackTraceElement stack : org.bukkit.craftbukkit.CraftServer.excessiveVelEx.getStackTrace()) {
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+ log.log( Level.SEVERE, "\t\t" + stack );
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+ }
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+ }
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+ // Paper end
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for ( StackTraceElement stack : thread.getStackTrace() )
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{
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log.log( Level.SEVERE, "\t\t" + stack );
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