From 42b62f094b969198fa9c03249dcd16f45a56ddff Mon Sep 17 00:00:00 2001 From: Benjamin James Harrison-Sims <tehrainbowguy@gmail.com> Date: Sun, 14 Apr 2013 21:19:57 +0500 Subject: [PATCH] Prevent handshake spam from invalid names. diff --git a/src/main/java/net/minecraft/server/Packet2Handshake.java b/src/main/java/net/minecraft/server/Packet2Handshake.java index 343af93..aa6609b 100644 --- a/src/main/java/net/minecraft/server/Packet2Handshake.java +++ b/src/main/java/net/minecraft/server/Packet2Handshake.java @@ -1,5 +1,7 @@ package net.minecraft.server; +import org.bukkit.craftbukkit.Spigot; + import java.io.DataInputStream; import java.io.DataOutputStream; @@ -19,6 +21,7 @@ public class Packet2Handshake extends Packet { this.b = a(datainputstream, 16); this.c = a(datainputstream, 255); this.d = datainputstream.readInt(); + if(!Spigot.validName.matcher(this.b).matches()) throw new IOException("Invalid name!"); // Spigot } public void a(DataOutputStream dataoutputstream) throws IOException { // CraftBukkit - throws IOException diff --git a/src/main/java/org/bukkit/craftbukkit/Spigot.java b/src/main/java/org/bukkit/craftbukkit/Spigot.java index 99020e7..c7ef0e1 100644 --- a/src/main/java/org/bukkit/craftbukkit/Spigot.java +++ b/src/main/java/org/bukkit/craftbukkit/Spigot.java @@ -6,6 +6,7 @@ import java.net.InetAddress; import java.util.ArrayList; import java.util.List; import java.util.logging.Level; +import java.util.regex.Pattern; import net.minecraft.server.AxisAlignedBB; import net.minecraft.server.Chunk; import net.minecraft.server.Entity; @@ -57,6 +58,7 @@ public class Spigot { private static Metrics metrics; public static List<String> bungeeIPs; public static int textureResolution = 16; + public static final Pattern validName = Pattern.compile("^[a-zA-Z0-9_-]{2,16}$"); public static void initialize(CraftServer server, SimpleCommandMap commandMap, YamlConfiguration configuration) { commandMap.register("bukkit", new org.bukkit.craftbukkit.command.TicksPerSecondCommand("tps")); @@ -384,7 +386,9 @@ public class Spigot { } /** - * Gets the range an entity should be 'tracked' by players and visible in the client. + * Gets the range an entity should be 'tracked' by players and visible in + * the client. + * * @param entity * @param defaultRange Default range defined by Mojang * @return -- 1.8.1.2