171 Zeilen
9.1 KiB
Diff
171 Zeilen
9.1 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Aikar <aikar@aikar.co>
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Date: Thu, 3 Mar 2016 01:17:12 -0600
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Subject: [PATCH] Ensure commands are not ran async
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Plugins calling Player.chat("/foo") or Server.dispatchCommand() could
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trigger the server to execute a command while on another thread.
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These commands would then process EXPECTING to be on the main thread, leaving to
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very hard to trace concurrency issues.
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This change will synchronize the command execution back to the main thread, causing a
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big slowdown in execution but throwing an exception at same time to raise awareness
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that it is happening so that plugin authors can fix their code to stop executing commands async.
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This also properly splits up the chat and command handling to reflect the server now
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having separate packets for both, and the client always using the correct packet. Text
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from a chat packet should never be parsed into a command, even if it starts with the `/`
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character.
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Co-authored-by: Jake Potrebic <jake.m.potrebic@gmail.com>
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diff --git a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
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index 403f7c7f31e0072b0cad0706bc981ece24733a1d..42a44820a3c13e2b0e29e02ed384c1918c9a0b17 100644
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--- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
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+++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
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@@ -2034,7 +2034,7 @@ public class ServerGamePacketListenerImpl implements ServerPlayerConnection, Tic
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return true;
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}
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- private static boolean isChatMessageIllegal(String message) {
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+ public static boolean isChatMessageIllegal(String message) { // Paper - private -> public
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for (int i = 0; i < message.length(); ++i) {
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if (!SharedConstants.isAllowedChatCharacter(message.charAt(i))) {
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return true;
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@@ -2051,7 +2051,7 @@ public class ServerGamePacketListenerImpl implements ServerPlayerConnection, Tic
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}
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OutgoingChatMessage outgoing = OutgoingChatMessage.create(original);
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- if (!async && s.startsWith("/")) {
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+ if (false && !async && s.startsWith("/")) { // Paper - don't handle commands in chat logic
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this.handleCommand(s);
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} else if (this.player.getChatVisibility() == ChatVisiblity.SYSTEM) {
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// Do nothing, this is coming from a plugin
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@@ -2141,7 +2141,29 @@ public class ServerGamePacketListenerImpl implements ServerPlayerConnection, Tic
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}
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}
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- private void handleCommand(String s) {
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+ public void handleCommand(String s) { // Paper - private -> public
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+ // Paper Start
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+ if (!org.spigotmc.AsyncCatcher.shuttingDown && !org.bukkit.Bukkit.isPrimaryThread()) {
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+ LOGGER.error("Command Dispatched Async: " + s);
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+ LOGGER.error("Please notify author of plugin causing this execution to fix this bug! see: http://bit.ly/1oSiM6C", new Throwable());
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+ Waitable<Void> wait = new Waitable<>() {
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+ @Override
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+ protected Void evaluate() {
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+ ServerGamePacketListenerImpl.this.handleCommand(s);
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+ return null;
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+ }
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+ };
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+ server.processQueue.add(wait);
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+ try {
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+ wait.get();
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+ return;
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+ } catch (InterruptedException e) {
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+ Thread.currentThread().interrupt(); // This is proper habit for java. If we aren't handling it, pass it on!
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+ } catch (Exception e) {
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+ throw new RuntimeException("Exception processing chat command", e.getCause());
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+ }
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+ }
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+ // Paper End
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co.aikar.timings.MinecraftTimings.playerCommandTimer.startTiming(); // Paper
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if ( org.spigotmc.SpigotConfig.logCommands ) // Spigot
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this.LOGGER.info(this.player.getScoreboardName() + " issued server command: " + s);
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diff --git a/src/main/java/org/bukkit/craftbukkit/CraftServer.java b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
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index 1e601581d7b6bb59ccec3c0b4a87747ec6c64f84..d3254e29df8543de33923a54b78c3af027e68b71 100644
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--- a/src/main/java/org/bukkit/craftbukkit/CraftServer.java
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+++ b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
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@@ -875,6 +875,28 @@ public final class CraftServer implements Server {
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Validate.notNull(commandLine, "CommandLine cannot be null");
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org.spigotmc.AsyncCatcher.catchOp("command dispatch"); // Spigot
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+ // Paper Start
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+ if (!org.spigotmc.AsyncCatcher.shuttingDown && !Bukkit.isPrimaryThread()) {
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+ final CommandSender fSender = sender;
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+ final String fCommandLine = commandLine;
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+ Bukkit.getLogger().log(Level.SEVERE, "Command Dispatched Async: " + commandLine);
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+ Bukkit.getLogger().log(Level.SEVERE, "Please notify author of plugin causing this execution to fix this bug! see: http://bit.ly/1oSiM6C", new Throwable());
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+ org.bukkit.craftbukkit.util.Waitable<Boolean> wait = new org.bukkit.craftbukkit.util.Waitable<Boolean>() {
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+ @Override
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+ protected Boolean evaluate() {
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+ return dispatchCommand(fSender, fCommandLine);
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+ }
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+ };
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+ net.minecraft.server.MinecraftServer.getServer().processQueue.add(wait);
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+ try {
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+ return wait.get();
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+ } catch (InterruptedException e) {
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+ Thread.currentThread().interrupt(); // This is proper habit for java. If we aren't handling it, pass it on!
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+ } catch (Exception e) {
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+ throw new RuntimeException("Exception processing dispatch command", e.getCause());
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+ }
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+ }
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+ // Paper End
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if (this.commandMap.dispatch(sender, commandLine)) {
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return true;
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}
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diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
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index cef936dea0592b08b1cca0482d1220ffe4b2c05a..b1f69f7183b2765695446fd587527def4dd8c4c9 100644
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--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
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+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
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@@ -437,7 +437,20 @@ public class CraftPlayer extends CraftHumanEntity implements Player {
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public void chat(String msg) {
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if (this.getHandle().connection == null) return;
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- this.getHandle().connection.chat(msg, PlayerChatMessage.system(msg), false);
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+ // Paper start - improve chat handling
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+ if (ServerGamePacketListenerImpl.isChatMessageIllegal(msg)) {
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+ this.getHandle().connection.disconnect(Component.translatable("multiplayer.disconnect.illegal_characters"), org.bukkit.event.player.PlayerKickEvent.Cause.ILLEGAL_CHARACTERS);
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+ } else {
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+ if (msg.startsWith("/")) {
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+ this.getHandle().connection.handleCommand(msg);
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+ } else {
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+ final PlayerChatMessage playerChatMessage = PlayerChatMessage.system(msg).withResult(new net.minecraft.network.chat.ChatDecorator.ModernResult(Component.literal(msg), true, false));
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+ // TODO chat decorating
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+ // TODO text filtering
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+ this.getHandle().connection.chat(msg, playerChatMessage, false);
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+ }
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+ }
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+ // Paper end
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}
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@Override
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diff --git a/src/main/java/org/bukkit/craftbukkit/util/ServerShutdownThread.java b/src/main/java/org/bukkit/craftbukkit/util/ServerShutdownThread.java
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index 19c44daaa407b7c1c7a7ffe56fef8c8814c6d5b2..6a073a9dc44d93eba296a0e18a9c7be8a7881725 100644
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--- a/src/main/java/org/bukkit/craftbukkit/util/ServerShutdownThread.java
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+++ b/src/main/java/org/bukkit/craftbukkit/util/ServerShutdownThread.java
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@@ -13,6 +13,7 @@ public class ServerShutdownThread extends Thread {
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public void run() {
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try {
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org.spigotmc.AsyncCatcher.enabled = false; // Spigot
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+ org.spigotmc.AsyncCatcher.shuttingDown = true; // Paper
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this.server.close();
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} finally {
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try {
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diff --git a/src/main/java/org/spigotmc/AsyncCatcher.java b/src/main/java/org/spigotmc/AsyncCatcher.java
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index 78669fa035b7537ff7e533cf32aaf2995625424f..7585a30e8f063ac2656b5de519b1e9edaceffbc7 100644
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--- a/src/main/java/org/spigotmc/AsyncCatcher.java
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+++ b/src/main/java/org/spigotmc/AsyncCatcher.java
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@@ -6,6 +6,7 @@ public class AsyncCatcher
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{
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public static boolean enabled = true;
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+ public static boolean shuttingDown = false; // Paper
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public static void catchOp(String reason)
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{
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diff --git a/src/main/java/org/spigotmc/RestartCommand.java b/src/main/java/org/spigotmc/RestartCommand.java
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index 882e93ad4471e3688f2fcfb1e6f16926786ee5e7..94d8ba376cd1f024b244654cac9bb62bb19e3060 100644
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--- a/src/main/java/org/spigotmc/RestartCommand.java
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+++ b/src/main/java/org/spigotmc/RestartCommand.java
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@@ -43,6 +43,7 @@ public class RestartCommand extends Command
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private static void restart(final String restartScript)
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{
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AsyncCatcher.enabled = false; // Disable async catcher incase it interferes with us
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+ org.spigotmc.AsyncCatcher.shuttingDown = true; // Paper
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try
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{
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String[] split = restartScript.split( " " );
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