Paper/patches/server/0573-Add-bypass-host-check.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Shane Freeder <theboyetronic@gmail.com>
Date: Sun, 18 Apr 2021 21:27:01 +0100
Subject: [PATCH] Add bypass host check

Paper.bypassHostCheck

Seriously, fix your firewalls. -.-

diff --git a/src/main/java/net/minecraft/server/network/ServerHandshakePacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerHandshakePacketListenerImpl.java
index 65ee0a7183abb0a4b1f36d2ef9631c00b52eb99e..f72a63d654bf5b7edebfc5afdced0b204d70966d 100644
--- a/src/main/java/net/minecraft/server/network/ServerHandshakePacketListenerImpl.java
+++ b/src/main/java/net/minecraft/server/network/ServerHandshakePacketListenerImpl.java
@@ -30,6 +30,7 @@ public class ServerHandshakePacketListenerImpl implements ServerHandshakePacketL
     private static final Component IGNORE_STATUS_REASON = Component.translatable("disconnect.ignoring_status_request");
     private final MinecraftServer server;
     private final Connection connection;
+    private static final boolean BYPASS_HOSTCHECK = Boolean.getBoolean("Paper.bypassHostCheck"); // Paper
 
     public ServerHandshakePacketListenerImpl(MinecraftServer server, Connection connection) {
         this.server = server;
@@ -127,7 +128,7 @@ public class ServerHandshakePacketListenerImpl implements ServerHandshakePacketL
                     if (!handledByEvent && proxyLogicEnabled) {
                         // Paper end
                     // if (org.spigotmc.SpigotConfig.bungee) { // Paper - comment out, we check above!
-                        if ( ( split.length == 3 || split.length == 4 ) && ( ServerHandshakePacketListenerImpl.HOST_PATTERN.matcher( split[1] ).matches() ) ) {
+                        if ( ( split.length == 3 || split.length == 4 ) && ( ServerHandshakePacketListenerImpl.BYPASS_HOSTCHECK || ServerHandshakePacketListenerImpl.HOST_PATTERN.matcher( split[1] ).matches() ) ) { // Paper
                             connection.hostname = split[0];
                             connection.address = new java.net.InetSocketAddress(split[1], ((java.net.InetSocketAddress) this.connection.getRemoteAddress()).getPort());
                             connection.spoofedUUID = com.mojang.util.UndashedUuid.fromStringLenient( split[2] );