From d01b92b4aabe9e0688e7280e5a836d30684c6c01 Mon Sep 17 00:00:00 2001 From: Shane Freeder Date: Sun, 29 Jul 2018 05:02:15 +0100 Subject: [PATCH] Break up and make tab spam limits configurable Due to the changes in 1.13, clients will send a tab completion request for all bukkit commands in order to factor in the lack of support for brigadier and provide backwards support in the API. Craftbukkit, however; has moved the chat spam limiter to also interact with the tab completion request, which while good for avoiding abuse, causes 1.13 clients to easilly be kicked from a server in bukkit due to this. Removing the spam limit could cause issues for servers, however, there is no way for servers to manipulate this without blindly cancelling kick events, which only causes additional complications. This also causes issues in that the tab spam limit and chat share the same field but different limits, meaning that a player having typed a long command may be kicked from the server. Splitting the field up and making it configurable allows for server owners to take the burden of this into their own hand without having to rely on plugins doing unsafe things. diff --git a/src/main/java/com/destroystokyo/paper/PaperConfig.java b/src/main/java/com/destroystokyo/paper/PaperConfig.java index 8c3880c838..d773ef5b0d 100644 --- a/src/main/java/com/destroystokyo/paper/PaperConfig.java +++ b/src/main/java/com/destroystokyo/paper/PaperConfig.java @@ -311,4 +311,18 @@ public class PaperConfig { logger.log(Level.INFO, "******************************************************"); } } + + public static int tabSpamIncrement = 1; + public static int tabSpamLimit = 500; + private static void tabSpamLimiters() { + tabSpamIncrement = getInt("settings.spam-limiter.tab-spam-increment", tabSpamIncrement); + // Older versions used a smaller limit, which is too low for 1.13, we'll bump this up if default + if (version < 14) { + if (tabSpamIncrement == 10) { + set("settings.spam-limiter.tab-spam-increment", 2); + tabSpamIncrement = 2; + } + } + tabSpamLimit = getInt("settings.spam-limiter.tab-spam-limit", tabSpamLimit); + } } diff --git a/src/main/java/net/minecraft/server/PlayerConnection.java b/src/main/java/net/minecraft/server/PlayerConnection.java index 05dec82386..0aa1e2a057 100644 --- a/src/main/java/net/minecraft/server/PlayerConnection.java +++ b/src/main/java/net/minecraft/server/PlayerConnection.java @@ -76,6 +76,7 @@ public class PlayerConnection implements PacketListenerPlayIn { // CraftBukkit start - multithreaded fields private volatile int chatThrottle; private static final AtomicIntegerFieldUpdater chatSpamField = AtomicIntegerFieldUpdater.newUpdater(PlayerConnection.class, "chatThrottle"); + private final java.util.concurrent.atomic.AtomicInteger tabSpamLimiter = new java.util.concurrent.atomic.AtomicInteger(); // Paper - configurable tab spam limits // CraftBukkit end private int j; private final Int2ShortMap k = new Int2ShortOpenHashMap(); @@ -204,6 +205,7 @@ public class PlayerConnection implements PacketListenerPlayIn { this.minecraftServer.getMethodProfiler().exit(); // CraftBukkit start for (int spam; (spam = this.chatThrottle) > 0 && !chatSpamField.compareAndSet(this, spam, spam - 1); ) ; + if (tabSpamLimiter.get() > 0) tabSpamLimiter.getAndDecrement(); // Paper - split to seperate variable /* Use thread-safe field access instead if (this.chatThrottle > 0) { --this.chatThrottle; @@ -522,7 +524,7 @@ public class PlayerConnection implements PacketListenerPlayIn { public void a(PacketPlayInTabComplete packetplayintabcomplete) { // PlayerConnectionUtils.ensureMainThread(packetplayintabcomplete, this, this.player.getWorldServer()); // Paper - run this async // CraftBukkit start - if (chatSpamField.addAndGet(this, 1) > 500 && !this.minecraftServer.getPlayerList().isOp(this.player.getProfile())) { + if (tabSpamLimiter.addAndGet(com.destroystokyo.paper.PaperConfig.tabSpamIncrement) > com.destroystokyo.paper.PaperConfig.tabSpamLimit && !this.minecraftServer.getPlayerList().isOp(this.player.getProfile())) { // Paper start - split and make configurable minecraftServer.scheduleOnMain(() -> this.disconnect(new ChatMessage("disconnect.spam", new Object[0]))); // Paper return; } -- 2.21.0