From 52263ac3b76332c1ad6795fb0fe82eb8b15de5a8 Mon Sep 17 00:00:00 2001
From: Matthew Miller <mnmiller1@me.com>
Date: Wed, 28 Feb 2018 10:59:00 +1000
Subject: [PATCH] Ignore CUI connections with more than 3 failed attempts.

---
 .../main/java/com/sk89q/worldedit/LocalSession.java   | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/worldedit-core/src/main/java/com/sk89q/worldedit/LocalSession.java b/worldedit-core/src/main/java/com/sk89q/worldedit/LocalSession.java
index e7ffcd165..9c04626ae 100644
--- a/worldedit-core/src/main/java/com/sk89q/worldedit/LocalSession.java
+++ b/worldedit-core/src/main/java/com/sk89q/worldedit/LocalSession.java
@@ -65,6 +65,7 @@ public class LocalSession {
     // Non-session related fields
     private transient LocalConfiguration config;
     private transient final AtomicBoolean dirty = new AtomicBoolean();
+    private transient int failedCuiAttempts = 0;
 
     // Session related
     private transient RegionSelector selector = new CuboidRegionSelector();
@@ -772,14 +773,22 @@ public class LocalSession {
      */
     public void handleCUIInitializationMessage(String text) {
         checkNotNull(text);
+        if (this.failedCuiAttempts > 3) {
+            return;
+        }
 
-        String[] split = text.split("\\|");
+        String[] split = text.split("\\|", 2);
         if (split.length > 1 && split[0].equalsIgnoreCase("v")) { // enough fields and right message
+            if (split[1].length() > 4) {
+                this.failedCuiAttempts ++;
+                return;
+            }
             setCUISupport(true);
             try {
                 setCUIVersion(Integer.parseInt(split[1]));
             } catch (NumberFormatException e) {
                 WorldEdit.logger.warning("Error while reading CUI init message: " + e.getMessage());
+                this.failedCuiAttempts ++;
             }
         }
     }