Add Unix domain socket support

paper-server/patches/sources/net/minecraft/server/dedicated/DedicatedServer.java.patch

@@ -148,7 +148,7 @@
          DedicatedServer.LOGGER.info("Starting minecraft server version {}", SharedConstants.getCurrentVersion().getName());
          if (Runtime.getRuntime().maxMemory() / 1024L / 1024L < 512L) {
              DedicatedServer.LOGGER.warn("To start the server with more ram, launch it as \"java -Xmx1024M -Xms1024M -jar minecraft_server.jar\"");
-@@ -126,13 +203,35 @@
+@@ -126,14 +203,50 @@
              this.setPreventProxyConnections(dedicatedserverproperties.preventProxyConnections);
              this.setLocalIp(dedicatedserverproperties.serverIp);
          }
@@ -183,9 +183,41 @@
 -        this.worldData.setGameType(dedicatedserverproperties.gamemode);
 +        // 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;
  
-@@ -156,21 +255,31 @@
+         if (!this.getLocalIp().isEmpty()) {
+@@ -143,12 +256,15 @@
+         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());
+@@ -156,21 +272,31 @@
              return false;
          }
  
@@ -222,7 +254,7 @@
              this.debugSampleSubscriptionTracker = new DebugSampleSubscriptionTracker(this.getPlayerList());
              this.tickTimeLogger = new RemoteSampleLogger(TpsDebugDimensions.values().length, this.debugSampleSubscriptionTracker, RemoteDebugSampleType.TICK_TIME);
              long i = Util.getNanos();
-@@ -178,13 +287,13 @@
+@@ -178,13 +304,13 @@
              SkullBlockEntity.setup(this.services, this);
              GameProfileCache.setUsesAuthentication(this.usesAuthentication());
              DedicatedServer.LOGGER.info("Preparing level \"{}\"", this.getLevelIdName());
@@ -238,7 +270,7 @@
              }
  
              if (dedicatedserverproperties.enableQuery) {
-@@ -197,7 +306,7 @@
+@@ -197,7 +323,7 @@
                  this.rconThread = RconThread.create(this);
              }
  
@@ -247,7 +279,7 @@
                  Thread thread1 = new Thread(new ServerWatchdog(this));
  
                  thread1.setUncaughtExceptionHandler(new DefaultUncaughtExceptionHandlerWithName(DedicatedServer.LOGGER));
-@@ -215,6 +324,12 @@
+@@ -215,6 +341,12 @@
          }
      }
  
@@ -260,7 +292,7 @@
      @Override
      public boolean isSpawningMonsters() {
          return this.settings.getProperties().spawnMonsters && super.isSpawningMonsters();
-@@ -227,7 +342,7 @@
+@@ -227,7 +359,7 @@
  
      @Override
      public void forceDifficulty() {
@@ -269,7 +301,7 @@
      }
  
      @Override
-@@ -286,13 +401,14 @@
+@@ -286,13 +418,14 @@
          }
  
          if (this.rconThread != null) {
@@ -286,7 +318,7 @@
      }
  
      @Override
-@@ -302,19 +418,29 @@
+@@ -302,19 +435,29 @@
      }
  
      @Override
@@ -322,7 +354,7 @@
          }
  
      }
-@@ -383,7 +509,7 @@
+@@ -383,7 +526,7 @@
  
      @Override
      public boolean isUnderSpawnProtection(ServerLevel world, BlockPos pos, Player player) {
@@ -331,7 +363,7 @@
              return false;
          } else if (this.getPlayerList().getOps().isEmpty()) {
              return false;
-@@ -453,7 +579,11 @@
+@@ -453,7 +596,11 @@
      public boolean enforceSecureProfile() {
          DedicatedServerProperties dedicatedserverproperties = this.getProperties();
  
@@ -344,7 +376,7 @@
      }
  
      @Override
-@@ -541,16 +671,52 @@
+@@ -541,16 +688,52 @@
  
      @Override
      public String getPluginNames() {
@@ -401,7 +433,7 @@
      }
  
      public void storeUsingWhiteList(boolean useWhitelist) {
-@@ -660,4 +826,15 @@
+@@ -660,4 +843,15 @@
              }
          }
      }