16869992a8
* Make the legacy ping handler more reliable
The Minecraft server often fails to respond to old ("legacy") pings
from old Minecraft versions using the protocol used before the switch
to Netty in Minecraft 1.7.
Due to packet fragmentation[1], we might not have all needed bytes
available when the LegacyPingHandler is called. In this case, it will
run into an error, remove the handler and continue using the modern
protocol.
This is unlikely to happen for the first two revisions of the legacy
ping protocol (used in Minecraft 1.5.x and older) since the request
consists of only one or two bytes, but happens frequently for the
last/third revision introduced in Minecraft 1.6.
It has much larger, variable packet sizes due to the inclusion of
the virtual host (the hostname/port used to connect to the server).
The solution[2] is simple: If we find more than two matching bytes,
we buffer the remaining bytes until we have enough to fully read and
respond to the request.
[1]: https://netty.io/wiki/user-guide-for-4.x.html#wiki-h3-11
[2]: https://netty.io/wiki/user-guide-for-4.x.html#wiki-h4-13
* Add legacy ping support to PaperServerListPingEvent
Add a new method to StatusClient check if the client is a legacy
client that does not support all of the features provided in the
event.
158 lines
7.1 KiB
Diff
158 lines
7.1 KiB
Diff
From c3962bc906bb2b19cd37ef2d64d3aaa1a06763d3 Mon Sep 17 00:00:00 2001
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From: Minecrell <minecrell@minecrell.net>
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Date: Wed, 11 Oct 2017 19:30:51 +0200
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Subject: [PATCH] Call PaperServerListPingEvent for legacy pings
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diff --git a/src/main/java/com/destroystokyo/paper/network/PaperLegacyStatusClient.java b/src/main/java/com/destroystokyo/paper/network/PaperLegacyStatusClient.java
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new file mode 100644
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index 000000000..74c012fd4
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--- /dev/null
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+++ b/src/main/java/com/destroystokyo/paper/network/PaperLegacyStatusClient.java
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@@ -0,0 +1,73 @@
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+package com.destroystokyo.paper.network;
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+
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+import com.destroystokyo.paper.event.server.PaperServerListPingEvent;
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+import net.minecraft.server.MinecraftServer;
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+import org.apache.commons.lang3.StringUtils;
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+import org.bukkit.ChatColor;
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+
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+import java.net.InetSocketAddress;
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+
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+import javax.annotation.Nullable;
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+
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+public final class PaperLegacyStatusClient implements StatusClient {
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+
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+ private final InetSocketAddress address;
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+ private final int protocolVersion;
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+ @Nullable private final InetSocketAddress virtualHost;
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+
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+ private PaperLegacyStatusClient(InetSocketAddress address, int protocolVersion, @Nullable InetSocketAddress virtualHost) {
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+ this.address = address;
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+ this.protocolVersion = protocolVersion;
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+ this.virtualHost = virtualHost;
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+ }
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+
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+ @Override
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+ public InetSocketAddress getAddress() {
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+ return this.address;
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+ }
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+
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+ @Override
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+ public int getProtocolVersion() {
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+ return this.protocolVersion;
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+ }
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+
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+ @Nullable
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+ @Override
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+ public InetSocketAddress getVirtualHost() {
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+ return this.virtualHost;
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+ }
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+
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+ @Override
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+ public boolean isLegacy() {
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+ return true;
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+ }
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+
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+ public static PaperServerListPingEvent processRequest(MinecraftServer server,
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+ InetSocketAddress address, int protocolVersion, @Nullable InetSocketAddress virtualHost) {
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+
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+ PaperServerListPingEvent event = new PaperServerListPingEventImpl(server,
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+ new PaperLegacyStatusClient(address, protocolVersion, virtualHost), Byte.MAX_VALUE, null);
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+ server.server.getPluginManager().callEvent(event);
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+
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+ if (event.isCancelled()) {
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+ return null;
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+ }
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+
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+ return event;
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+ }
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+
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+ public static String getMotd(PaperServerListPingEvent event) {
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+ return getFirstLine(event.getMotd());
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+ }
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+
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+ public static String getUnformattedMotd(PaperServerListPingEvent event) {
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+ // Strip color codes and all other occurrences of the color char (because it's used as delimiter)
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+ return getFirstLine(StringUtils.remove(ChatColor.stripColor(event.getMotd()), ChatColor.COLOR_CHAR));
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+ }
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+
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+ private static String getFirstLine(String s) {
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+ int pos = s.indexOf('\n');
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+ return pos >= 0 ? s.substring(0, pos) : s;
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+ }
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+
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+}
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diff --git a/src/main/java/net/minecraft/server/LegacyPingHandler.java b/src/main/java/net/minecraft/server/LegacyPingHandler.java
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index f084a653a..39d19e91b 100644
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--- a/src/main/java/net/minecraft/server/LegacyPingHandler.java
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+++ b/src/main/java/net/minecraft/server/LegacyPingHandler.java
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@@ -9,6 +9,7 @@ import java.net.InetSocketAddress;
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import java.nio.charset.StandardCharsets;
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import org.apache.logging.log4j.LogManager;
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import org.apache.logging.log4j.Logger;
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+import com.destroystokyo.paper.network.PaperLegacyStatusClient; // Paper
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public class LegacyPingHandler extends ChannelInboundHandlerAdapter {
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@@ -41,11 +42,19 @@ public class LegacyPingHandler extends ChannelInboundHandlerAdapter {
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MinecraftServer minecraftserver = this.b.d();
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int i = bytebuf.readableBytes();
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String s;
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+ com.destroystokyo.paper.event.server.PaperServerListPingEvent event; // Paper
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switch (i) {
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case 0:
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LegacyPingHandler.a.debug("Ping: (<1.3.x) from {}:{}", inetsocketaddress.getAddress(), Integer.valueOf(inetsocketaddress.getPort()));
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- s = String.format("%s\u00a7%d\u00a7%d", new Object[] { minecraftserver.getMotd(), Integer.valueOf(minecraftserver.H()), Integer.valueOf(minecraftserver.I())});
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+ // Paper start - Call PaperServerListPingEvent and use results
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+ event = PaperLegacyStatusClient.processRequest(minecraftserver, inetsocketaddress, 39, null);
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+ if (event == null) {
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+ channelhandlercontext.close();
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+ break;
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+ }
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+ s = String.format("%s\u00a7%d\u00a7%d", PaperLegacyStatusClient.getUnformattedMotd(event), event.getNumPlayers(), event.getMaxPlayers());
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+ // Paper end
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this.a(channelhandlercontext, this.a(s));
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break;
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@@ -55,7 +64,15 @@ public class LegacyPingHandler extends ChannelInboundHandlerAdapter {
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}
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LegacyPingHandler.a.debug("Ping: (1.4-1.5.x) from {}:{}", inetsocketaddress.getAddress(), Integer.valueOf(inetsocketaddress.getPort()));
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- 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())});
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+ // Paper start - Call PaperServerListPingEvent and use results
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+ event = PaperLegacyStatusClient.processRequest(minecraftserver, inetsocketaddress, 61, null);
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+ if (event == null) {
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+ channelhandlercontext.close();
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+ break;
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+ }
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+ s = String.format("\u00a71\u0000%d\u0000%s\u0000%s\u0000%d\u0000%d", event.getProtocolVersion(), event.getVersion(),
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+ PaperLegacyStatusClient.getMotd(event), event.getNumPlayers(), event.getMaxPlayers());
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+ // Paper end
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this.a(channelhandlercontext, this.a(s));
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break;
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@@ -161,8 +178,16 @@ public class LegacyPingHandler extends ChannelInboundHandlerAdapter {
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a.debug("Ping: (1.6) from {}", ctx.channel().remoteAddress());
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- String response = String.format("\u00a71\u0000%d\u0000%s\u0000%s\u0000%d\u0000%d",
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- Byte.MAX_VALUE, server.getVersion(), server.getMotd(), server.getPlayerCount(), server.getMaxPlayers());
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+ InetSocketAddress virtualHost = com.destroystokyo.paper.network.PaperNetworkClient.prepareVirtualHost(host, port);
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+ com.destroystokyo.paper.event.server.PaperServerListPingEvent event = PaperLegacyStatusClient.processRequest(
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+ server, (InetSocketAddress) ctx.channel().remoteAddress(), protocolVersion, virtualHost);
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+ if (event == null) {
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+ ctx.close();
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+ return;
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+ }
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+
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+ String response = String.format("\u00a71\u0000%d\u0000%s\u0000%s\u0000%d\u0000%d", event.getProtocolVersion(), event.getVersion(),
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+ PaperLegacyStatusClient.getMotd(event), event.getNumPlayers(), event.getMaxPlayers());
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this.a(ctx, this.a(response));
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}
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--
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2.15.0
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