99 lines
5.1 KiB
Diff
99 lines
5.1 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Spottedleaf <Spottedleaf@users.noreply.github.com>
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Date: Fri, 30 Oct 2020 22:37:16 -0700
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Subject: [PATCH] Add packet limiter config
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Example config:
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packet-limiter:
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kick-message: '&cSent too many packets'
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limits:
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all:
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interval: 7.0
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max-packet-rate: 500.0
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ServerboundPlaceRecipePacket:
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interval: 4.0
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max-packet-rate: 5.0
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action: DROP
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all section refers to all incoming packets, the action for all is
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hard coded to KICK.
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For specific limits, the section name is the class's name,
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and an action can be defined: DROP or KICK
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If interval or rate are less-than 0, the limit is ignored
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diff --git a/src/main/java/net/minecraft/network/Connection.java b/src/main/java/net/minecraft/network/Connection.java
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index 489ab7c7a66969501e60fbd44c16ba4cdc180d46..28e91d015cf0034cd7ca952440fd4f915c34d489 100644
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--- a/src/main/java/net/minecraft/network/Connection.java
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+++ b/src/main/java/net/minecraft/network/Connection.java
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@@ -154,6 +154,22 @@ public class Connection extends SimpleChannelInboundHandler<Packet<?>> {
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}
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}
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// Paper end - allow controlled flushing
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+ // Paper start - packet limiter
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+ protected final Object PACKET_LIMIT_LOCK = new Object();
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+ protected final @Nullable io.papermc.paper.util.IntervalledCounter allPacketCounts = io.papermc.paper.configuration.GlobalConfiguration.get().packetLimiter.allPackets.isEnabled() ? new io.papermc.paper.util.IntervalledCounter(
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+ (long)(io.papermc.paper.configuration.GlobalConfiguration.get().packetLimiter.allPackets.interval() * 1.0e9)
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+ ) : null;
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+ protected final java.util.Map<Class<? extends net.minecraft.network.protocol.Packet<?>>, io.papermc.paper.util.IntervalledCounter> packetSpecificLimits = new java.util.HashMap<>();
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+
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+ private boolean stopReadingPackets;
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+ private void killForPacketSpam() {
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+ this.sendPacket(new ClientboundDisconnectPacket(io.papermc.paper.adventure.PaperAdventure.asVanilla(io.papermc.paper.configuration.GlobalConfiguration.get().packetLimiter.kickMessage)), PacketSendListener.thenRun(() -> {
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+ this.disconnect(io.papermc.paper.adventure.PaperAdventure.asVanilla(io.papermc.paper.configuration.GlobalConfiguration.get().packetLimiter.kickMessage));
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+ }));
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+ this.setReadOnly();
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+ this.stopReadingPackets = true;
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+ }
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+ // Paper end - packet limiter
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public Connection(PacketFlow side) {
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this.receiving = side;
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@@ -234,6 +250,45 @@ public class Connection extends SimpleChannelInboundHandler<Packet<?>> {
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protected void channelRead0(ChannelHandlerContext channelhandlercontext, Packet<?> packet) {
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if (this.channel.isOpen()) {
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+ // Paper start - packet limiter
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+ if (this.stopReadingPackets) {
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+ return;
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+ }
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+ if (this.allPacketCounts != null ||
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+ io.papermc.paper.configuration.GlobalConfiguration.get().packetLimiter.overrides.containsKey(packet.getClass())) {
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+ long time = System.nanoTime();
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+ synchronized (PACKET_LIMIT_LOCK) {
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+ if (this.allPacketCounts != null) {
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+ this.allPacketCounts.updateAndAdd(1, time);
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+ if (this.allPacketCounts.getRate() >= io.papermc.paper.configuration.GlobalConfiguration.get().packetLimiter.allPackets.maxPacketRate()) {
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+ this.killForPacketSpam();
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+ return;
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+ }
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+ }
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+
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+ for (Class<?> check = packet.getClass(); check != Object.class; check = check.getSuperclass()) {
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+ io.papermc.paper.configuration.GlobalConfiguration.PacketLimiter.PacketLimit packetSpecificLimit =
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+ io.papermc.paper.configuration.GlobalConfiguration.get().packetLimiter.overrides.get(check);
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+ if (packetSpecificLimit == null || !packetSpecificLimit.isEnabled()) {
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+ continue;
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+ }
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+ io.papermc.paper.util.IntervalledCounter counter = this.packetSpecificLimits.computeIfAbsent((Class)check, (clazz) -> {
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+ return new io.papermc.paper.util.IntervalledCounter((long)(packetSpecificLimit.interval() * 1.0e9));
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+ });
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+ counter.updateAndAdd(1, time);
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+ if (counter.getRate() >= packetSpecificLimit.maxPacketRate()) {
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+ switch (packetSpecificLimit.action()) {
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+ case DROP:
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+ return;
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+ case KICK:
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+ this.killForPacketSpam();
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+ return;
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+ }
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+ }
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+ }
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+ }
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+ }
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+ // Paper end - packet limiter
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try {
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Connection.genericsFtw(packet, this.packetListener);
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} catch (RunningOnDifferentThreadException cancelledpackethandleexception) {
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