PaperMC/patches/server/0297-Limit-Client-Sign-length-more.patch
Jake Potrebic d8847bc1f3
Updated Upstream (Bukkit/CraftBukkit) (#9922)
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:
fde5602a PR-927: Add PlayerRecipeBookSettingsChangeEvent
949ff217 PR-930: Add methods to get/set evoker fang attack delay
f6f7c79d SPIGOT-7514, PR-929: Add "Enchantment Roll" API to enchant items according to Minecraft mechanics
d40e22da PR-712: Add API to get full result of crafting items

CraftBukkit Changes:
c8feb0629 PR-1291: Improve precondition message in Entity#playEffect
482c56a00 PR-1285: Add PlayerRecipeBookSettingsChangeEvent
cdf798800 PR-1290: Add methods to get/set evoker fang attack delay
2c1b5f78f SPIGOT-7514, PR-1289: Add "Enchantment Roll" API to enchant items according to Minecraft mechanics
6aa644ae9 PR-992: Add API to get full result of crafting items
ffb1319bc PR-1287: Fix scoreboards not updating in Player#setStatistic
2023-11-11 12:25:45 -08:00

56 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 892a06c76e5e77b43d592c325fcbf32f9d107181..93b1e0b287d195181cb2253b3490ed537efa6b8e 100644
--- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
@@ -288,6 +288,7 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
private final MessageSignatureCache messageSignatureCache;
private final FutureChain chatMessageChain;
private boolean waitingForSwitchToConfig;
+ private static final int MAX_SIGN_LINE_LENGTH = Integer.getInteger("Paper.maxSignLength", 80); // Paper
public ServerGamePacketListenerImpl(MinecraftServer server, Connection connection, ServerPlayer player, CommonListenerCookie clientData) {
super(server, connection, clientData, player); // CraftBukkit
@@ -3052,7 +3053,19 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
@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);