From a0648fde5463784940996efbce228a5fa1736173 Mon Sep 17 00:00:00 2001
From: Techcable <Techcable@outlook.com>
Date: Sun, 7 Feb 2016 00:01:19 -0700
Subject: [PATCH] Add a property to accept invalid ping packets

This is disabled by default, as I don't wanna accept invalid packets
You can enable it by setting '-Dwaterfall.acceptInvalidPackets=true' at the command line

Fixes #23

diff --git a/proxy/src/main/java/net/md_5/bungee/connection/InitialHandler.java b/proxy/src/main/java/net/md_5/bungee/connection/InitialHandler.java
index f11643ab..c7de8fa4 100644
--- a/proxy/src/main/java/net/md_5/bungee/connection/InitialHandler.java
+++ b/proxy/src/main/java/net/md_5/bungee/connection/InitialHandler.java
@@ -248,10 +248,14 @@ public class InitialHandler extends PacketHandler implements PendingConnection
         thisState = State.PING;
     }
 
+    private static final boolean ACCEPT_INVALID_PACKETS = Boolean.parseBoolean(System.getProperty("waterfall.acceptInvalidPackets", "false"));
+
     @Override
     public void handle(PingPacket ping) throws Exception
     {
-        Preconditions.checkState( thisState == State.PING, "Not expecting PING" );
+        if (!ACCEPT_INVALID_PACKETS) {
+            Preconditions.checkState(thisState == State.PING, "Not expecting PING");
+        }
         unsafe.sendPacket( ping );
         disconnect( "" );
     }
-- 
2.11.0.windows.1