From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 From: Aikar Date: Thu, 3 Mar 2016 01:17:12 -0600 Subject: [PATCH] Ensure commands are not ran async Plugins calling Player.chat("/foo") or Server.dispatchCommand() could trigger the server to execute a command while on another thread. These commands would then process EXPECTING to be on the main thread, leaving to very hard to trace concurrency issues. This change will synchronize the command execution back to the main thread, causing a big slowdown in execution but throwing an exception at same time to raise awareness that it is happening so that plugin authors can fix their code to stop executing commands async. This also properly splits up the chat and command handling to reflect the server now having separate packets for both, and the client always using the correct packet. Text from a chat packet should never be parsed into a command, even if it starts with the `/` character. Co-authored-by: Jake Potrebic diff --git a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java index d72e8df4f99b6219ea305742f0cf8d1c1985ffd6..ddd437906801973e11386294e7e3f6846cc11cbc 100644 --- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java +++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java @@ -2041,7 +2041,7 @@ public class ServerGamePacketListenerImpl implements ServerPlayerConnection, Tic return true; } - private static boolean isChatMessageIllegal(String message) { + public static boolean isChatMessageIllegal(String message) { // Paper - private -> public for (int i = 0; i < message.length(); ++i) { if (!SharedConstants.isAllowedChatCharacter(message.charAt(i))) { return true; @@ -2058,7 +2058,7 @@ public class ServerGamePacketListenerImpl implements ServerPlayerConnection, Tic } OutgoingChatMessage outgoing = OutgoingChatMessage.create(original); - if (!async && s.startsWith("/")) { + if (false && !async && s.startsWith("/")) { // Paper - don't handle commands in chat logic this.handleCommand(s); } else if (this.player.getChatVisibility() == ChatVisiblity.SYSTEM) { // Do nothing, this is coming from a plugin @@ -2148,7 +2148,29 @@ public class ServerGamePacketListenerImpl implements ServerPlayerConnection, Tic } } - private void handleCommand(String s) { + public void handleCommand(String s) { // Paper - private -> public + // Paper Start + if (!org.spigotmc.AsyncCatcher.shuttingDown && !org.bukkit.Bukkit.isPrimaryThread()) { + LOGGER.error("Command Dispatched Async: " + s); + LOGGER.error("Please notify author of plugin causing this execution to fix this bug! see: http://bit.ly/1oSiM6C", new Throwable()); + Waitable wait = new Waitable<>() { + @Override + protected Void evaluate() { + ServerGamePacketListenerImpl.this.handleCommand(s); + return null; + } + }; + server.processQueue.add(wait); + try { + wait.get(); + return; + } catch (InterruptedException e) { + Thread.currentThread().interrupt(); // This is proper habit for java. If we aren't handling it, pass it on! + } catch (Exception e) { + throw new RuntimeException("Exception processing chat command", e.getCause()); + } + } + // Paper End co.aikar.timings.MinecraftTimings.playerCommandTimer.startTiming(); // Paper if ( org.spigotmc.SpigotConfig.logCommands ) // Spigot this.LOGGER.info(this.player.getScoreboardName() + " issued server command: " + s); diff --git a/src/main/java/org/bukkit/craftbukkit/CraftServer.java b/src/main/java/org/bukkit/craftbukkit/CraftServer.java index fb6ea46609489d802ed4b76b4074734dd3e3886f..dd3935eeceba456b37a5fbcb874c1073bb76d473 100644 --- a/src/main/java/org/bukkit/craftbukkit/CraftServer.java +++ b/src/main/java/org/bukkit/craftbukkit/CraftServer.java @@ -875,6 +875,28 @@ public final class CraftServer implements Server { Validate.notNull(commandLine, "CommandLine cannot be null"); org.spigotmc.AsyncCatcher.catchOp("command dispatch"); // Spigot + // Paper Start + if (!org.spigotmc.AsyncCatcher.shuttingDown && !Bukkit.isPrimaryThread()) { + final CommandSender fSender = sender; + final String fCommandLine = commandLine; + Bukkit.getLogger().log(Level.SEVERE, "Command Dispatched Async: " + commandLine); + Bukkit.getLogger().log(Level.SEVERE, "Please notify author of plugin causing this execution to fix this bug! see: http://bit.ly/1oSiM6C", new Throwable()); + org.bukkit.craftbukkit.util.Waitable wait = new org.bukkit.craftbukkit.util.Waitable() { + @Override + protected Boolean evaluate() { + return dispatchCommand(fSender, fCommandLine); + } + }; + net.minecraft.server.MinecraftServer.getServer().processQueue.add(wait); + try { + return wait.get(); + } catch (InterruptedException e) { + Thread.currentThread().interrupt(); // This is proper habit for java. If we aren't handling it, pass it on! + } catch (Exception e) { + throw new RuntimeException("Exception processing dispatch command", e.getCause()); + } + } + // Paper End if (this.commandMap.dispatch(sender, commandLine)) { return true; } diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java index f18fa546bf9a045f7b10e8eb898339b2adf8d4a0..15c6c3a6e9d4e371425604667af7cc2b24fae021 100644 --- a/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java +++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java @@ -479,7 +479,20 @@ public class CraftPlayer extends CraftHumanEntity implements Player { public void chat(String msg) { if (this.getHandle().connection == null) return; - this.getHandle().connection.chat(msg, PlayerChatMessage.system(msg), false); + // Paper start - improve chat handling + if (ServerGamePacketListenerImpl.isChatMessageIllegal(msg)) { + this.getHandle().connection.disconnect(Component.translatable("multiplayer.disconnect.illegal_characters")); + } else { + if (msg.startsWith("/")) { + this.getHandle().connection.handleCommand(msg); + } else { + final PlayerChatMessage playerChatMessage = PlayerChatMessage.system(msg).withResult(new net.minecraft.network.chat.ChatDecorator.ModernResult(Component.literal(msg), true, false)); + // TODO chat decorating + // TODO text filtering + this.getHandle().connection.chat(msg, playerChatMessage, false); + } + } + // Paper end } @Override diff --git a/src/main/java/org/bukkit/craftbukkit/util/ServerShutdownThread.java b/src/main/java/org/bukkit/craftbukkit/util/ServerShutdownThread.java index 19c44daaa407b7c1c7a7ffe56fef8c8814c6d5b2..6a073a9dc44d93eba296a0e18a9c7be8a7881725 100644 --- a/src/main/java/org/bukkit/craftbukkit/util/ServerShutdownThread.java +++ b/src/main/java/org/bukkit/craftbukkit/util/ServerShutdownThread.java @@ -13,6 +13,7 @@ public class ServerShutdownThread extends Thread { public void run() { try { org.spigotmc.AsyncCatcher.enabled = false; // Spigot + org.spigotmc.AsyncCatcher.shuttingDown = true; // Paper this.server.close(); } finally { try { diff --git a/src/main/java/org/spigotmc/AsyncCatcher.java b/src/main/java/org/spigotmc/AsyncCatcher.java index 05e94702e42b8f5c35d2a112c486d57948a3acba..5409f230fdd53b70fc03c58177438534731ad4e6 100644 --- a/src/main/java/org/spigotmc/AsyncCatcher.java +++ b/src/main/java/org/spigotmc/AsyncCatcher.java @@ -6,6 +6,7 @@ public class AsyncCatcher { public static boolean enabled = true; + public static boolean shuttingDown = false; // Paper public static void catchOp(String reason) { diff --git a/src/main/java/org/spigotmc/RestartCommand.java b/src/main/java/org/spigotmc/RestartCommand.java index 882e93ad4471e3688f2fcfb1e6f16926786ee5e7..94d8ba376cd1f024b244654cac9bb62bb19e3060 100644 --- a/src/main/java/org/spigotmc/RestartCommand.java +++ b/src/main/java/org/spigotmc/RestartCommand.java @@ -43,6 +43,7 @@ public class RestartCommand extends Command private static void restart(final String restartScript) { AsyncCatcher.enabled = false; // Disable async catcher incase it interferes with us + org.spigotmc.AsyncCatcher.shuttingDown = true; // Paper try { String[] split = restartScript.split( " " );