Several fixes and new api for experience merging/stacking (#9242)

1 files changed, 137 insertions, 0 deletions

diff --git a/patches/server/0548-Add-Unix-domain-socket-support.patch b/patches/server/0548-Add-Unix-domain-socket-support.patch
new file mode 100644
index 0000000000..054790699a
--- /dev/null
+++ b/patches/server/0548-Add-Unix-domain-socket-support.patch
@@ -0,0 +1,137 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Andrew Steinborn <[email protected]>
+Date: Tue, 11 May 2021 17:39:22 -0400
+Subject: [PATCH] Add Unix domain socket support
+
+
+diff --git a/src/main/java/net/minecraft/server/dedicated/DedicatedServer.java b/src/main/java/net/minecraft/server/dedicated/DedicatedServer.java
+index 5d62639b18d0bf8f5f7c8adc3470a6087980241b..4bc7b3d7c5214b3272614fe3fce8e4d8d2264867 100644
+--- a/src/main/java/net/minecraft/server/dedicated/DedicatedServer.java
++++ b/src/main/java/net/minecraft/server/dedicated/DedicatedServer.java
+@@ -232,6 +232,20 @@ public class DedicatedServer extends MinecraftServer implements ServerInterface
+         this.setEnforceWhitelist(dedicatedserverproperties.enforceWhitelist);
+         // this.worldData.setGameType(dedicatedserverproperties.gamemode); // CraftBukkit - moved to world loading
+         DedicatedServer.LOGGER.info("Default game type: {}", dedicatedserverproperties.gamemode);
++        // Paper start - Unix domain socket support
++        java.net.SocketAddress bindAddress;
++        if (this.getLocalIp().startsWith("unix:")) {
++            if (!io.netty.channel.epoll.Epoll.isAvailable()) {
++                DedicatedServer.LOGGER.error("**** INVALID CONFIGURATION!");
++                DedicatedServer.LOGGER.error("You are trying to use a Unix domain socket but you're not on a supported OS.");
++                return false;
++            } else if (!io.papermc.paper.configuration.GlobalConfiguration.get().proxies.velocity.enabled && !org.spigotmc.SpigotConfig.bungee) {
++                DedicatedServer.LOGGER.error("**** INVALID CONFIGURATION!");
++                DedicatedServer.LOGGER.error("Unix domain sockets require IPs to be forwarded from a proxy.");
++                return false;
++            }
++            bindAddress = new io.netty.channel.unix.DomainSocketAddress(this.getLocalIp().substring("unix:".length()));
++        } else {
+         InetAddress inetaddress = null;
+ 
+         if (!this.getLocalIp().isEmpty()) {
+@@ -241,12 +255,15 @@ public class DedicatedServer extends MinecraftServer implements ServerInterface
+         if (this.getPort() < 0) {
+             this.setPort(dedicatedserverproperties.serverPort);
+         }
++        bindAddress = new java.net.InetSocketAddress(inetaddress, this.getPort());
++        }
++        // Paper end - Unix domain socket support
+ 
+         this.initializeKeyPair();
+         DedicatedServer.LOGGER.info("Starting Minecraft server on {}:{}", this.getLocalIp().isEmpty() ? "*" : this.getLocalIp(), this.getPort());
+ 
+         try {
+-            this.getConnection().startTcpServerListener(inetaddress, this.getPort());
++            this.getConnection().bind(bindAddress); // Paper - Unix domain socket support
+         } catch (IOException ioexception) {
+             DedicatedServer.LOGGER.warn("**** FAILED TO BIND TO PORT!");
+             DedicatedServer.LOGGER.warn("The exception was: {}", ioexception.toString());
+diff --git a/src/main/java/net/minecraft/server/network/ServerConnectionListener.java b/src/main/java/net/minecraft/server/network/ServerConnectionListener.java
+index d6d7f1c446ba5507f67038ff27775ba75156f4a7..c63c194c44646e6bc1a59426552787011fc2ced5 100644
+--- a/src/main/java/net/minecraft/server/network/ServerConnectionListener.java
++++ b/src/main/java/net/minecraft/server/network/ServerConnectionListener.java
+@@ -76,7 +76,12 @@ public class ServerConnectionListener {
+         this.running = true;
+     }
+ 
++    // Paper start - Unix domain socket support
+     public void startTcpServerListener(@Nullable InetAddress address, int port) throws IOException {
++        bind(new java.net.InetSocketAddress(address, port));
++    }
++    public void bind(java.net.SocketAddress address) throws IOException {
++    // Paper end - Unix domain socket support
+         List list = this.channels;
+ 
+         synchronized (this.channels) {
+@@ -84,7 +89,13 @@ public class ServerConnectionListener {
+             EventLoopGroup eventloopgroup;
+ 
+             if (Epoll.isAvailable() && this.server.isEpollEnabled()) {
++                // Paper start - Unix domain socket support
++                if (address instanceof io.netty.channel.unix.DomainSocketAddress) {
++                    oclass = io.netty.channel.epoll.EpollServerDomainSocketChannel.class;
++                } else {
+                 oclass = EpollServerSocketChannel.class;
++                }
++                // Paper end - Unix domain socket support
+                 eventloopgroup = (EventLoopGroup) ServerConnectionListener.SERVER_EPOLL_EVENT_GROUP.get();
+                 ServerConnectionListener.LOGGER.info("Using epoll channel type");
+             } else {
+@@ -117,7 +128,7 @@ public class ServerConnectionListener {
+                     ((Connection) object).setListenerForServerboundHandshake(new ServerHandshakePacketListenerImpl(ServerConnectionListener.this.server, (Connection) object));
+                     io.papermc.paper.network.ChannelInitializeListenerHolder.callListeners(channel); // Paper - Add Channel initialization listeners
+                 }
+-            }).group(eventloopgroup).localAddress(address, port)).option(ChannelOption.AUTO_READ, false).bind().syncUninterruptibly()); // CraftBukkit
++            }).group(eventloopgroup).localAddress(address)).option(ChannelOption.AUTO_READ, false).bind().syncUninterruptibly()); // CraftBukkit // Paper - Unix domain socket support
+         }
+     }
+ 
+diff --git a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+index a04c7677ded862890e6e809db610817b4cfff56a..f4c6e815253f3e49577c554bf632e5c9f4f578ff 100644
+--- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
++++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+@@ -2534,6 +2534,11 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
+     // Spigot Start
+     public SocketAddress getRawAddress()
+     {
++        // Paper start - Unix domain socket support; this can be nullable in the case of a Unix domain socket, so if it is, fake something
++        if (connection.channel.remoteAddress() == null) {
++            return new java.net.InetSocketAddress(java.net.InetAddress.getLoopbackAddress(), 0);
++        }
++        // Paper end - Unix domain socket support
+         return this.connection.channel.remoteAddress();
+     }
+     // Spigot End
+diff --git a/src/main/java/net/minecraft/server/network/ServerHandshakePacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerHandshakePacketListenerImpl.java
+index b5d8ef9dd24687b99f5cf547574351c359fb85ba..45a2683c9489bee6d67a1f3d702c17f2e9dc02e4 100644
+--- a/src/main/java/net/minecraft/server/network/ServerHandshakePacketListenerImpl.java
++++ b/src/main/java/net/minecraft/server/network/ServerHandshakePacketListenerImpl.java
+@@ -80,6 +80,7 @@ public class ServerHandshakePacketListenerImpl implements ServerHandshakePacketL
+         this.connection.setupOutboundProtocol(LoginProtocols.CLIENTBOUND);
+         // CraftBukkit start - Connection throttle
+         try {
++            if (!(this.connection.channel.localAddress() instanceof io.netty.channel.unix.DomainSocketAddress)) { // Paper - Unix domain socket support; the connection throttle is useless when you have a Unix domain socket
+             long currentTime = System.currentTimeMillis();
+             long connectionThrottle = this.server.server.getConnectionThrottle();
+             InetAddress address = ((java.net.InetSocketAddress) this.connection.getRemoteAddress()).getAddress();
+@@ -108,6 +109,7 @@ public class ServerHandshakePacketListenerImpl implements ServerHandshakePacketL
+                     }
+                 }
+             }
++            } // Paper - Unix domain socket support
+         } catch (Throwable t) {
+             org.apache.logging.log4j.LogManager.getLogger().debug("Failed to check connection throttle", t);
+         }
+@@ -165,8 +167,11 @@ public class ServerHandshakePacketListenerImpl implements ServerHandshakePacketL
+             if (!handledByEvent && proxyLogicEnabled) { // Paper
+                 // if (org.spigotmc.SpigotConfig.bungee) { // Paper - comment out, we check above!
+                 if ( ( split.length == 3 || split.length == 4 ) && ( ServerHandshakePacketListenerImpl.BYPASS_HOSTCHECK || ServerHandshakePacketListenerImpl.HOST_PATTERN.matcher( split[1] ).matches() ) ) { // Paper - Add bypass host check
++                    // Paper start - Unix domain socket support
++                    java.net.SocketAddress socketAddress = this.connection.getRemoteAddress();
+                     this.connection.hostname = split[0];
+-                    this.connection.address = new java.net.InetSocketAddress(split[1], ((java.net.InetSocketAddress) this.connection.getRemoteAddress()).getPort());
++                    this.connection.address = new java.net.InetSocketAddress(split[1], socketAddress instanceof java.net.InetSocketAddress ? ((java.net.InetSocketAddress) socketAddress).getPort() : 0);
++                    // Paper end - Unix domain socket support
+                     this.connection.spoofedUUID = com.mojang.util.UndashedUuid.fromStringLenient( split[2] );
+                 } else
+                 {