PaperMC/patches/server/0838-Use-single-player-info-update-packet-on-join.patch
Owen 89d51d5f29
Allow enabling sand duping (#10191)
Because this exploit has been widely known for years and has not been fixed by Mojang, we decided that it was worth allowing people to toggle it on/off due to how easy it is to make it configurable.

It should be noted that this decision does not promise all future exploits will be configurable.
2024-03-03 17:05:34 -05:00

51 lines
3.5 KiB
Diff

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jake Potrebic <jake.m.potrebic@gmail.com>
Date: Sun, 8 Jan 2023 17:38:28 -0800
Subject: [PATCH] Use single player info update packet on join
diff --git a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
index 994787f52ce9eb0b77889ed9bc8021183fa0cb7c..a1196f79968c950fd9d92123bb4018f8d29c3a82 100644
--- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
@@ -3339,7 +3339,7 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
this.signedMessageDecoder = session.createMessageDecoder(this.player.getUUID());
this.chatMessageChain.append(() -> {
this.player.setChatSession(session);
- this.server.getPlayerList().broadcastAll(new ClientboundPlayerInfoUpdatePacket(EnumSet.of(ClientboundPlayerInfoUpdatePacket.Action.INITIALIZE_CHAT), List.of(this.player)));
+ this.server.getPlayerList().broadcastAll(new ClientboundPlayerInfoUpdatePacket(EnumSet.of(ClientboundPlayerInfoUpdatePacket.Action.INITIALIZE_CHAT), List.of(this.player)), this.player); // Paper - Use single player info update packet on join
});
}
diff --git a/src/main/java/net/minecraft/server/players/PlayerList.java b/src/main/java/net/minecraft/server/players/PlayerList.java
index 1478def0ba4bc02c1c466d80cc2b90919612c18a..0747b0042446271385371f1ca9c8fefdebd851b8 100644
--- a/src/main/java/net/minecraft/server/players/PlayerList.java
+++ b/src/main/java/net/minecraft/server/players/PlayerList.java
@@ -359,6 +359,7 @@ public abstract class PlayerList {
// CraftBukkit start - sendAll above replaced with this loop
ClientboundPlayerInfoUpdatePacket packet = ClientboundPlayerInfoUpdatePacket.createPlayerInitializing(List.of(player));
+ final List<ServerPlayer> onlinePlayers = Lists.newArrayListWithExpectedSize(this.players.size() - 1); // Paper - Use single player info update packet on join
for (int i = 0; i < this.players.size(); ++i) {
ServerPlayer entityplayer1 = (ServerPlayer) this.players.get(i);
@@ -366,12 +367,17 @@ public abstract class PlayerList {
entityplayer1.connection.send(packet);
}
- if (!bukkitPlayer.canSee(entityplayer1.getBukkitEntity())) {
+ if (entityplayer1 == player || !bukkitPlayer.canSee(entityplayer1.getBukkitEntity())) { // Paper - Use single player info update packet on join; Don't include joining player
continue;
}
- player.connection.send(ClientboundPlayerInfoUpdatePacket.createPlayerInitializing(List.of(entityplayer1)));
+ onlinePlayers.add(entityplayer1); // Paper - Use single player info update packet on join
}
+ // Paper start - Use single player info update packet on join
+ if (!onlinePlayers.isEmpty()) {
+ player.connection.send(ClientboundPlayerInfoUpdatePacket.createPlayerInitializing(onlinePlayers));
+ }
+ // Paper end - Use single player info update packet on join
player.sentListPacket = true;
player.supressTrackerForLogin = false; // Paper - Fire PlayerJoinEvent when Player is actually ready
((ServerLevel)player.level()).getChunkSource().chunkMap.addEntity(player); // Paper - Fire PlayerJoinEvent when Player is actually ready; track entity now