138 lines
6.2 KiB
Diff
138 lines
6.2 KiB
Diff
From 5e98ffe924abde6c9985464127a99fc2506fba12 Mon Sep 17 00:00:00 2001
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From: Aikar <aikar@aikar.co>
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Date: Sat, 2 Mar 2019 14:55:01 -0500
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Subject: [PATCH] Handle Excessive Signs in Chunks creating large packets
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Also adds a limit to stop sending Sign and other data to client after
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a significant amount have been sent.
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Use -DPaper.excessiveTELimit=750 to configure that limit, or -1
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to disable the limit and let your players be abused.
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With further contributions from
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Co-Authored-by: Spottedleaf <spottedleaf@spottedleaf.dev>
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diff --git a/src/main/java/net/minecraft/server/NetworkManager.java b/src/main/java/net/minecraft/server/NetworkManager.java
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index b1dededc15..ddc12364e7 100644
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--- a/src/main/java/net/minecraft/server/NetworkManager.java
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+++ b/src/main/java/net/minecraft/server/NetworkManager.java
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@@ -158,19 +158,53 @@ public class NetworkManager extends SimpleChannelInboundHandler<Packet<?>> {
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NetworkManager.LOGGER.debug("Set listener of {} to {}", this, packetlistener);
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this.packetListener = packetlistener;
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}
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+ // Paper start
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+ private static java.util.List<Packet> buildExtraPackets(Packet packet) {
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+ java.util.List<Packet> extra = packet.getExtraPackets();
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+ if (extra == null || extra.isEmpty()) {
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+ return null;
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+ }
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+ java.util.List<Packet> ret = new java.util.ArrayList<>(1 + extra.size());
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+ buildExtraPackets0(extra, ret);
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+ return ret;
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+ }
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+
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+ private static void buildExtraPackets0(java.util.List<Packet> extraPackets, java.util.List<Packet> into) {
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+ for (Packet extra : extraPackets) {
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+ into.add(extra);
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+ java.util.List<Packet> extraExtra = extra.getExtraPackets();
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+ if (extraExtra != null && !extraExtra.isEmpty()) {
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+ buildExtraPackets0(extraExtra, into);
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+ }
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+ }
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+ }
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+ // Paper end
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public void sendPacket(Packet<?> packet) {
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this.sendPacket(packet, (GenericFutureListener) null);
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}
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public void sendPacket(Packet<?> packet, @Nullable GenericFutureListener<? extends Future<? super Void>> genericfuturelistener) {
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- if (this.isConnected()) {
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- this.o();
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- this.b(packet, genericfuturelistener);
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- } else {
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+ // Paper start start - handle oversized packets better
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+ // write the packets to the queue, then flush - antixray hooks there already
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+ java.util.List<Packet> extraPackets = buildExtraPackets(packet);
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+ boolean hasExtraPackets = extraPackets != null && !extraPackets.isEmpty();
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+ if (!hasExtraPackets) {
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this.packetQueue.add(new NetworkManager.QueuedPacket(packet, genericfuturelistener));
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- }
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+ } else {
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+ java.util.List<NetworkManager.QueuedPacket> packets = new java.util.ArrayList<>(1 + extraPackets.size());
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+ packets.add(new NetworkManager.QueuedPacket(packet, null)); // delay the future listener until the end of the extra packets
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+ for (int i = 0, len = extraPackets.size(); i < len;) {
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+ Packet extra = extraPackets.get(i);
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+ boolean end = ++i == len;
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+ packets.add(new NetworkManager.QueuedPacket(extra, end ? genericfuturelistener : null)); // append listener to the end
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+ }
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+
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+ this.packetQueue.addAll(packets); // atomic
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+ }
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+ this.sendPacketQueue(); // ensure only one flush call is made
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+ // Paper end
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}
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private void dispatchPacket(Packet<?> packet, @Nullable GenericFutureListener<? extends Future<? super Void>> genericFutureListener) { this.b(packet, genericFutureListener); } // Paper - OBFHELPER
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diff --git a/src/main/java/net/minecraft/server/Packet.java b/src/main/java/net/minecraft/server/Packet.java
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index 2d8e6a2f4a..8d0965a053 100644
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--- a/src/main/java/net/minecraft/server/Packet.java
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+++ b/src/main/java/net/minecraft/server/Packet.java
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@@ -11,6 +11,7 @@ public interface Packet<T extends PacketListener> {
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void a(T t0);
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// Paper start
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+ default java.util.List<Packet> getExtraPackets() { return null; }
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default boolean packetTooLarge(NetworkManager manager) {
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return false;
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}
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diff --git a/src/main/java/net/minecraft/server/PacketPlayOutMapChunk.java b/src/main/java/net/minecraft/server/PacketPlayOutMapChunk.java
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index a0b87f89df..23223f3f45 100644
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--- a/src/main/java/net/minecraft/server/PacketPlayOutMapChunk.java
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+++ b/src/main/java/net/minecraft/server/PacketPlayOutMapChunk.java
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@@ -23,6 +23,15 @@ public class PacketPlayOutMapChunk implements Packet<PacketListenerPlayOut> {
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public PacketPlayOutMapChunk() {}
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+ // Paper start
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+ private final java.util.List<Packet> extraPackets = new java.util.ArrayList<>();
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+ private static final int TE_LIMIT = Integer.getInteger("Paper.excessiveTELimit", 750);
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+
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+ @Override
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+ public java.util.List<Packet> getExtraPackets() {
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+ return extraPackets;
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+ }
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+ // Paper end
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public PacketPlayOutMapChunk(Chunk chunk, int i) {
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ChunkCoordIntPair chunkcoordintpair = chunk.getPos();
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@@ -49,6 +58,7 @@ public class PacketPlayOutMapChunk implements Packet<PacketListenerPlayOut> {
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this.c = this.a(new PacketDataSerializer(this.j()), chunk, i);
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this.g = Lists.newArrayList();
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iterator = chunk.getTileEntities().entrySet().iterator();
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+ int totalTileEntities = 0; // Paper
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while (iterator.hasNext()) {
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entry = (Entry) iterator.next();
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@@ -57,6 +67,15 @@ public class PacketPlayOutMapChunk implements Packet<PacketListenerPlayOut> {
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int j = blockposition.getY() >> 4;
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if (this.f() || (i & 1 << j) != 0) {
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+ // Paper start - improve oversized chunk data packet handling
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+ if (++totalTileEntities > TE_LIMIT) {
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+ PacketPlayOutTileEntityData updatePacket = tileentity.getUpdatePacket();
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+ if (updatePacket != null) {
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+ this.extraPackets.add(updatePacket);
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+ continue;
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+ }
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+ }
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+ // Paper end
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NBTTagCompound nbttagcompound = tileentity.b();
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if (tileentity instanceof TileEntitySkull) { TileEntitySkull.sanitizeTileEntityUUID(nbttagcompound); } // Paper
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--
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2.26.2
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