c5a10665b8Spigot still maintains some partial implementation of "tick skipping", a practice in which the MinecraftServer.currentTick field is updated not by an increment of one per actual tick, but instead set to System.currentTimeMillis() / 50. This behaviour means that the tracked tick may "skip" a tick value in case a previous tick took more than the expected 50ms. To compensate for this in important paths, spigot/craftbukkit implements "wall-time". Instead of incrementing/decrementing ticks on block entities/entities by one for each call to their tick() method, they instead increment/decrement important values, like an ItemEntity's age or pickupDelay, by the difference of `currentTick - lastTick`, where `lastTick` is the value of `currentTick` during the last tick() call. These "fixes" however do not play nicely with minecraft's simulation distance as entities/block entities implementing the above behaviour would "catch up" their values when moving from a non-ticking chunk to a ticking one as their `lastTick` value remains stuck on the last tick in a ticking chunk and hence lead to a large "catch up" once ticked again. Paper completely removes the "tick skipping" behaviour (See patch "Further-improve-server-tick-loop"), making the above precautions completely unnecessary, which also rids paper of the previous described incompatibility with non-ticking chunks.
30 lines
2.2 KiB
Diff
30 lines
2.2 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Shane Freeder <theboyetronic@gmail.com>
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Date: Sun, 18 Apr 2021 21:27:01 +0100
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Subject: [PATCH] Add bypass host check
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Paper.bypassHostCheck
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Seriously, fix your firewalls. -.-
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diff --git a/src/main/java/net/minecraft/server/network/ServerHandshakePacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerHandshakePacketListenerImpl.java
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index 0c1bdf2329936ce479a2cc53e8a46bd2ad685ec1..a5bbea6a073e00c10c3c5facd997eb8473fd9a5f 100644
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--- a/src/main/java/net/minecraft/server/network/ServerHandshakePacketListenerImpl.java
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+++ b/src/main/java/net/minecraft/server/network/ServerHandshakePacketListenerImpl.java
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@@ -32,6 +32,7 @@ public class ServerHandshakePacketListenerImpl implements ServerHandshakePacketL
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private static final Component IGNORE_STATUS_REASON = Component.translatable("disconnect.ignoring_status_request");
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private final MinecraftServer server;
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private final Connection connection;
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+ private static final boolean BYPASS_HOSTCHECK = Boolean.getBoolean("Paper.bypassHostCheck"); // Paper
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public ServerHandshakePacketListenerImpl(MinecraftServer server, Connection connection) {
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this.server = server;
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@@ -164,7 +165,7 @@ public class ServerHandshakePacketListenerImpl implements ServerHandshakePacketL
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String[] split = packet.hostName().split("\00");
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if (!handledByEvent && proxyLogicEnabled) { // Paper
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// if (org.spigotmc.SpigotConfig.bungee) { // Paper - comment out, we check above!
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- if ( ( split.length == 3 || split.length == 4 ) && ( ServerHandshakePacketListenerImpl.HOST_PATTERN.matcher( split[1] ).matches() ) ) {
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+ if ( ( split.length == 3 || split.length == 4 ) && ( ServerHandshakePacketListenerImpl.BYPASS_HOSTCHECK || ServerHandshakePacketListenerImpl.HOST_PATTERN.matcher( split[1] ).matches() ) ) { // Paper - Add bypass host check
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this.connection.hostname = split[0];
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this.connection.address = new java.net.InetSocketAddress(split[1], ((java.net.InetSocketAddress) this.connection.getRemoteAddress()).getPort());
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this.connection.spoofedUUID = com.mojang.util.UndashedUuid.fromStringLenient( split[2] );
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