Paper/patches/server/0299-Limit-Client-Sign-length-more.patch
Nassim Jahnke 058d7c1aa3
Updated Upstream (Bukkit/CraftBukkit/Spigot)
Upstream has released updates that appear to apply and compile correctly.
This update has not been tested by PaperMC and as with ANY update, please do your own testing

Bukkit Changes:
13eb4146 SPIGOT-5217, SPIGOT-6183: Add RespawnReason to PlayerRespawnEvent

CraftBukkit Changes:
5ee3419b7 SPIGOT-5217, SPIGOT-6183: Add RespawnReason to PlayerRespawnEvent

Spigot Changes:
514cf03a Rebuild patches and add RespawnReason.PLUGIN to Player#respawn
2023-04-10 10:03:36 +02:00

57 lines
3.1 KiB
Diff

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Wed, 27 Feb 2019 22:18:40 -0500
Subject: [PATCH] Limit Client Sign length more
modified clients can send more data from the client
to the server and it would get stored on the sign as sent.
Mojang has a limit of 384 which is much higher than reasonable.
the client can barely render around 16 characters as-is, but formatting
codes can get it to be more than 16 actual length.
Set a limit of 80 which should give an average of 16 characters 2
sets of legacy formatting codes which should be plenty for all uses.
This does not strip any existing data from the NBT as plugins
may use this for storing data out of the rendered area.
it only impacts data sent from the client.
Set -DPaper.maxSignLength=XX to change limit or -1 to disable
diff --git a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
index cafc68064ee88a741d7ae4962046717e8c92f81d..741d28d56a59776df5134a1b769aaa41fa76ec55 100644
--- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
@@ -299,6 +299,7 @@ public class ServerGamePacketListenerImpl implements ServerPlayerConnection, Tic
private final MessageSignatureCache messageSignatureCache;
private final FutureChain chatMessageChain;
private static final long KEEPALIVE_LIMIT = Long.getLong("paper.playerconnection.keepalive", 30) * 1000; // Paper - provide property to set keepalive limit
+ private static final int MAX_SIGN_LINE_LENGTH = Integer.getInteger("Paper.maxSignLength", 80); // Paper
public ServerGamePacketListenerImpl(MinecraftServer server, Connection connection, ServerPlayer player) {
this.lastChatTimeStamp = new AtomicReference(Instant.EPOCH);
@@ -3192,7 +3193,19 @@ public class ServerGamePacketListenerImpl implements ServerPlayerConnection, Tic
@Override
public void handleSignUpdate(ServerboundSignUpdatePacket packet) {
- List<String> list = (List) Stream.of(packet.getLines()).map(ChatFormatting::stripFormatting).collect(Collectors.toList());
+ // Paper start - cap line length - modified clients can send longer data than normal
+ String[] lines = packet.getLines();
+ for (int i = 0; i < lines.length; ++i) {
+ if (MAX_SIGN_LINE_LENGTH > 0 && lines[i].length() > MAX_SIGN_LINE_LENGTH) {
+ // This handles multibyte characters as 1
+ int offset = lines[i].codePoints().limit(MAX_SIGN_LINE_LENGTH).map(Character::charCount).sum();
+ if (offset < lines[i].length()) {
+ lines[i] = lines[i].substring(0, offset); // this will break any filtering, but filtering is NYI as of 1.17
+ }
+ }
+ }
+ List<String> list = (List) Stream.of(lines).map(ChatFormatting::stripFormatting).collect(Collectors.toList());
+ // Paper end
this.filterTextPacket(list).thenAcceptAsync((list1) -> {
this.updateSignText(packet, list1);