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https://github.com/PaperMC/Paper.git
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55 lines
3.2 KiB
Diff
55 lines
3.2 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Aikar <aikar@aikar.co>
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Date: Wed, 27 Feb 2019 22:18:40 -0500
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Subject: [PATCH] Limit Client Sign length more
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modified clients can send more data from the client
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to the server and it would get stored on the sign as sent.
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Mojang has a limit of 384 which is much higher than reasonable.
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the client can barely render around 16 characters as-is, but formatting
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codes can get it to be more than 16 actual length.
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Set a limit of 80 which should give an average of 16 characters 2
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sets of legacy formatting codes which should be plenty for all uses.
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This does not strip any existing data from the NBT as plugins
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may use this for storing data out of the rendered area.
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it only impacts data sent from the client.
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Set -DPaper.maxSignLength=XX to change limit or -1 to disable
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diff --git a/src/main/java/net/minecraft/server/PlayerConnection.java b/src/main/java/net/minecraft/server/PlayerConnection.java
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index 1705e223ec913b02793f2c329ff9401fbcf08178..192dc7d56769a8800ecfd150f68750ad89e1d08f 100644
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--- a/src/main/java/net/minecraft/server/PlayerConnection.java
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+++ b/src/main/java/net/minecraft/server/PlayerConnection.java
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@@ -110,6 +110,7 @@ public class PlayerConnection implements PacketListenerPlayIn {
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private int E;
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private int receivedMovePackets;
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private int processedMovePackets;
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+ private static final int MAX_SIGN_LINE_LENGTH = Integer.getInteger("Paper.maxSignLength", 80);
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private static final long KEEPALIVE_LIMIT = Long.getLong("paper.playerconnection.keepalive", 30) * 1000; // Paper - provide property to set keepalive limit
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public PlayerConnection(MinecraftServer minecraftserver, NetworkManager networkmanager, EntityPlayer entityplayer) {
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@@ -2698,7 +2699,17 @@ public class PlayerConnection implements PacketListenerPlayIn {
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String[] lines = new String[4];
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for (int i = 0; i < list.size(); ++i) {
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- lines[i] = SharedConstants.filterAllowedChatCharacters(list.get(i)); // Paper - Replaced with anvil color stripping method to stop exploits that allow colored signs to be created.
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+ // Paper start - cap line length - modified clients can send longer data than normal
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+ String currentLine = list.get(i);
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+ if (MAX_SIGN_LINE_LENGTH > 0 && currentLine.length() > MAX_SIGN_LINE_LENGTH) {
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+ // This handles multibyte characters as 1
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+ int offset = currentLine.codePoints().limit(MAX_SIGN_LINE_LENGTH).map(Character::charCount).sum();
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+ if (offset < currentLine.length()) {
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+ list.set(i, currentLine = currentLine.substring(0, offset));
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+ }
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+ }
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+ // Paper end
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+ lines[i] = SharedConstants.filterAllowedChatCharacters(currentLine); // Paper - Replaced with anvil color stripping method to stop exploits that allow colored signs to be created.
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}
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SignChangeEvent event = new SignChangeEvent((org.bukkit.craftbukkit.block.CraftBlock) player.getWorld().getBlockAt(x, y, z), this.server.getPlayer(this.player), lines);
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this.server.getPluginManager().callEvent(event);
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