PaperMC/Spigot-Server-Patches/0285-Call-PaperServerListPingEvent-for-legacy-pings.patch
Minecrell 81688d28d2 Avoid Netty buffer leak in LegacyPingHandler. Fixes #1200 (#1201)
The extra buffer used to decode the strings sent by the client
in the legacy ping protocol was never released. However, creating
an extra copy of the buffer just to decode it to a string isn't
actually necessary: We can just call toString() directly on the
original buffer.

Additionally, free the buffer in handlerRemoved() to handle cases
where the client never sends enough bytes to form a valid legacy
ping request.
2018-07-13 02:43:56 -05:00

157 lines
7.1 KiB
Diff

From fdff041cd1df94bc3a0173545b6e171c3cdf4579 Mon Sep 17 00:00:00 2001
From: Minecrell <minecrell@minecrell.net>
Date: Wed, 11 Oct 2017 19:30:51 +0200
Subject: [PATCH] Call PaperServerListPingEvent for legacy pings
diff --git a/src/main/java/com/destroystokyo/paper/network/PaperLegacyStatusClient.java b/src/main/java/com/destroystokyo/paper/network/PaperLegacyStatusClient.java
new file mode 100644
index 000000000..74c012fd4
--- /dev/null
+++ b/src/main/java/com/destroystokyo/paper/network/PaperLegacyStatusClient.java
@@ -0,0 +1,73 @@
+package com.destroystokyo.paper.network;
+
+import com.destroystokyo.paper.event.server.PaperServerListPingEvent;
+import net.minecraft.server.MinecraftServer;
+import org.apache.commons.lang3.StringUtils;
+import org.bukkit.ChatColor;
+
+import java.net.InetSocketAddress;
+
+import javax.annotation.Nullable;
+
+public final class PaperLegacyStatusClient implements StatusClient {
+
+ private final InetSocketAddress address;
+ private final int protocolVersion;
+ @Nullable private final InetSocketAddress virtualHost;
+
+ private PaperLegacyStatusClient(InetSocketAddress address, int protocolVersion, @Nullable InetSocketAddress virtualHost) {
+ this.address = address;
+ this.protocolVersion = protocolVersion;
+ this.virtualHost = virtualHost;
+ }
+
+ @Override
+ public InetSocketAddress getAddress() {
+ return this.address;
+ }
+
+ @Override
+ public int getProtocolVersion() {
+ return this.protocolVersion;
+ }
+
+ @Nullable
+ @Override
+ public InetSocketAddress getVirtualHost() {
+ return this.virtualHost;
+ }
+
+ @Override
+ public boolean isLegacy() {
+ return true;
+ }
+
+ public static PaperServerListPingEvent processRequest(MinecraftServer server,
+ InetSocketAddress address, int protocolVersion, @Nullable InetSocketAddress virtualHost) {
+
+ PaperServerListPingEvent event = new PaperServerListPingEventImpl(server,
+ new PaperLegacyStatusClient(address, protocolVersion, virtualHost), Byte.MAX_VALUE, null);
+ server.server.getPluginManager().callEvent(event);
+
+ if (event.isCancelled()) {
+ return null;
+ }
+
+ return event;
+ }
+
+ public static String getMotd(PaperServerListPingEvent event) {
+ return getFirstLine(event.getMotd());
+ }
+
+ public static String getUnformattedMotd(PaperServerListPingEvent event) {
+ // Strip color codes and all other occurrences of the color char (because it's used as delimiter)
+ return getFirstLine(StringUtils.remove(ChatColor.stripColor(event.getMotd()), ChatColor.COLOR_CHAR));
+ }
+
+ private static String getFirstLine(String s) {
+ int pos = s.indexOf('\n');
+ return pos >= 0 ? s.substring(0, pos) : s;
+ }
+
+}
diff --git a/src/main/java/net/minecraft/server/LegacyPingHandler.java b/src/main/java/net/minecraft/server/LegacyPingHandler.java
index a89a86e6d..2762bcc2e 100644
--- a/src/main/java/net/minecraft/server/LegacyPingHandler.java
+++ b/src/main/java/net/minecraft/server/LegacyPingHandler.java
@@ -9,6 +9,7 @@ import java.net.InetSocketAddress;
import java.nio.charset.StandardCharsets;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
+import com.destroystokyo.paper.network.PaperLegacyStatusClient; // Paper
public class LegacyPingHandler extends ChannelInboundHandlerAdapter {
@@ -41,11 +42,19 @@ public class LegacyPingHandler extends ChannelInboundHandlerAdapter {
MinecraftServer minecraftserver = this.b.d();
int i = bytebuf.readableBytes();
String s;
+ com.destroystokyo.paper.event.server.PaperServerListPingEvent event; // Paper
switch (i) {
case 0:
LegacyPingHandler.a.debug("Ping: (<1.3.x) from {}:{}", inetsocketaddress.getAddress(), Integer.valueOf(inetsocketaddress.getPort()));
- s = String.format("%s\u00a7%d\u00a7%d", new Object[] { minecraftserver.getMotd(), Integer.valueOf(minecraftserver.H()), Integer.valueOf(minecraftserver.I())});
+ // Paper start - Call PaperServerListPingEvent and use results
+ event = PaperLegacyStatusClient.processRequest(minecraftserver, inetsocketaddress, 39, null);
+ if (event == null) {
+ channelhandlercontext.close();
+ break;
+ }
+ s = String.format("%s\u00a7%d\u00a7%d", PaperLegacyStatusClient.getUnformattedMotd(event), event.getNumPlayers(), event.getMaxPlayers());
+ // Paper end
this.a(channelhandlercontext, this.a(s));
break;
@@ -55,7 +64,15 @@ public class LegacyPingHandler extends ChannelInboundHandlerAdapter {
}
LegacyPingHandler.a.debug("Ping: (1.4-1.5.x) from {}:{}", inetsocketaddress.getAddress(), Integer.valueOf(inetsocketaddress.getPort()));
- s = String.format("\u00a71\u0000%d\u0000%s\u0000%s\u0000%d\u0000%d", new Object[] { Integer.valueOf(127), minecraftserver.getVersion(), minecraftserver.getMotd(), Integer.valueOf(minecraftserver.H()), Integer.valueOf(minecraftserver.I())});
+ // Paper start - Call PaperServerListPingEvent and use results
+ event = PaperLegacyStatusClient.processRequest(minecraftserver, inetsocketaddress, 61, null);
+ if (event == null) {
+ channelhandlercontext.close();
+ break;
+ }
+ s = String.format("\u00a71\u0000%d\u0000%s\u0000%s\u0000%d\u0000%d", event.getProtocolVersion(), event.getVersion(),
+ PaperLegacyStatusClient.getMotd(event), event.getNumPlayers(), event.getMaxPlayers());
+ // Paper end
this.a(channelhandlercontext, this.a(s));
break;
@@ -169,8 +186,16 @@ public class LegacyPingHandler extends ChannelInboundHandlerAdapter {
a.debug("Ping: (1.6) from {}", ctx.channel().remoteAddress());
- String response = String.format("\u00a71\u0000%d\u0000%s\u0000%s\u0000%d\u0000%d",
- Byte.MAX_VALUE, server.getVersion(), server.getMotd(), server.getPlayerCount(), server.getMaxPlayers());
+ InetSocketAddress virtualHost = com.destroystokyo.paper.network.PaperNetworkClient.prepareVirtualHost(host, port);
+ com.destroystokyo.paper.event.server.PaperServerListPingEvent event = PaperLegacyStatusClient.processRequest(
+ server, (InetSocketAddress) ctx.channel().remoteAddress(), protocolVersion, virtualHost);
+ if (event == null) {
+ ctx.close();
+ return;
+ }
+
+ String response = String.format("\u00a71\u0000%d\u0000%s\u0000%s\u0000%d\u0000%d", event.getProtocolVersion(), event.getVersion(),
+ PaperLegacyStatusClient.getMotd(event), event.getNumPlayers(), event.getMaxPlayers());
this.a(ctx, this.a(response));
}
--
2.18.0