Paper/patches/server/0692-Add-packet-limiter-config.patch
Bjarne Koll 2873869bb1
Drop manual isEditable copy in CraftSign
Signs no longer have a specific isEdiable state, the entire API in this
regard needs updating/deprecation. The boolean field is completely gone,
replaced by a uuid (which will need a new setEditingPlayer(UUID) method
on the Sign interface), and the current upstream implementation of
setEdiable simply flips the is_waxed state.

This patch is hence not needed as it neither allows editing (which will
be redone in a later patch) nor is required to copy the is_waxed boolean
flag as it lives in the signs compound tag and is covered by applyTo.
2023-06-08 11:35:39 +02:00

100 lines
5.2 KiB
Diff

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Spottedleaf <Spottedleaf@users.noreply.github.com>
Date: Fri, 30 Oct 2020 22:37:16 -0700
Subject: [PATCH] Add packet limiter config
Example config:
packet-limiter:
kick-message: '&cSent too many packets'
limits:
all:
interval: 7.0
max-packet-rate: 500.0
ServerboundPlaceRecipePacket:
interval: 4.0
max-packet-rate: 5.0
action: DROP
all section refers to all incoming packets, the action for all is
hard coded to KICK.
For specific limits, the section name is the class's name,
and an action can be defined: DROP or KICK
If interval or rate are less-than 0, the limit is ignored
diff --git a/src/main/java/net/minecraft/network/Connection.java b/src/main/java/net/minecraft/network/Connection.java
index b7b8ac7f0e93c183e0e7f39cb753f28daace843f..fde67116dde5dee59789de0e2ee70334db429559 100644
--- a/src/main/java/net/minecraft/network/Connection.java
+++ b/src/main/java/net/minecraft/network/Connection.java
@@ -120,6 +120,23 @@ public class Connection extends SimpleChannelInboundHandler<Packet<?>> {
private static boolean enableExplicitFlush = Boolean.getBoolean("paper.explicit-flush");
// Paper end
+ // Paper start - packet limiter
+ protected final Object PACKET_LIMIT_LOCK = new Object();
+ protected final @Nullable io.papermc.paper.util.IntervalledCounter allPacketCounts = io.papermc.paper.configuration.GlobalConfiguration.get().packetLimiter.allPackets.isEnabled() ? new io.papermc.paper.util.IntervalledCounter(
+ (long)(io.papermc.paper.configuration.GlobalConfiguration.get().packetLimiter.allPackets.interval() * 1.0e9)
+ ) : null;
+ protected final java.util.Map<Class<? extends net.minecraft.network.protocol.Packet<?>>, io.papermc.paper.util.IntervalledCounter> packetSpecificLimits = new java.util.HashMap<>();
+
+ private boolean stopReadingPackets;
+ private void killForPacketSpam() {
+ this.sendPacket(new ClientboundDisconnectPacket(io.papermc.paper.adventure.PaperAdventure.asVanilla(io.papermc.paper.configuration.GlobalConfiguration.get().packetLimiter.kickMessage)), PacketSendListener.thenRun(() -> {
+ this.disconnect(io.papermc.paper.adventure.PaperAdventure.asVanilla(io.papermc.paper.configuration.GlobalConfiguration.get().packetLimiter.kickMessage));
+ }));
+ this.setReadOnly();
+ this.stopReadingPackets = true;
+ }
+ // Paper end - packet limiter
+
public Connection(PacketFlow side) {
this.receiving = side;
}
@@ -213,6 +230,45 @@ public class Connection extends SimpleChannelInboundHandler<Packet<?>> {
protected void channelRead0(ChannelHandlerContext channelhandlercontext, Packet<?> packet) {
if (this.channel.isOpen()) {
+ // Paper start - packet limiter
+ if (this.stopReadingPackets) {
+ return;
+ }
+ if (this.allPacketCounts != null ||
+ io.papermc.paper.configuration.GlobalConfiguration.get().packetLimiter.overrides.containsKey(packet.getClass())) {
+ long time = System.nanoTime();
+ synchronized (PACKET_LIMIT_LOCK) {
+ if (this.allPacketCounts != null) {
+ this.allPacketCounts.updateAndAdd(1, time);
+ if (this.allPacketCounts.getRate() >= io.papermc.paper.configuration.GlobalConfiguration.get().packetLimiter.allPackets.maxPacketRate()) {
+ this.killForPacketSpam();
+ return;
+ }
+ }
+
+ for (Class<?> check = packet.getClass(); check != Object.class; check = check.getSuperclass()) {
+ io.papermc.paper.configuration.GlobalConfiguration.PacketLimiter.PacketLimit packetSpecificLimit =
+ io.papermc.paper.configuration.GlobalConfiguration.get().packetLimiter.overrides.get(check);
+ if (packetSpecificLimit == null || !packetSpecificLimit.isEnabled()) {
+ continue;
+ }
+ io.papermc.paper.util.IntervalledCounter counter = this.packetSpecificLimits.computeIfAbsent((Class)check, (clazz) -> {
+ return new io.papermc.paper.util.IntervalledCounter((long)(packetSpecificLimit.interval() * 1.0e9));
+ });
+ counter.updateAndAdd(1, time);
+ if (counter.getRate() >= packetSpecificLimit.maxPacketRate()) {
+ switch (packetSpecificLimit.action()) {
+ case DROP:
+ return;
+ case KICK:
+ this.killForPacketSpam();
+ return;
+ }
+ }
+ }
+ }
+ }
+ // Paper end - packet limiter
try {
Connection.genericsFtw(packet, this.packetListener);
} catch (RunningOnDifferentThreadException cancelledpackethandleexception) {