6f2009754d
At the time this was re-added, there was concern around how the JIT would handle the system property that enabled it. This shouldn't be a problem, and as such we no longer need to block access to it. The Vanilla Method Profiler will not provide much to most users however there is no harm in providing it as an option. For most users, the recommended and supported method for determining performance issues with Paper will continue to be Timings.
158 Zeilen
5.5 KiB
Diff
158 Zeilen
5.5 KiB
Diff
From e5e2cd4ea0e1734564f236f55af9b40950da47db Mon Sep 17 00:00:00 2001
|
|
From: Minecrell <minecrell@minecrell.net>
|
|
Date: Wed, 11 Oct 2017 18:22:50 +0200
|
|
Subject: [PATCH] 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
|
|
|
|
diff --git a/src/main/java/net/minecraft/server/LegacyPingHandler.java b/src/main/java/net/minecraft/server/LegacyPingHandler.java
|
|
index 4c1a0181..f084a653 100644
|
|
--- a/src/main/java/net/minecraft/server/LegacyPingHandler.java
|
|
+++ b/src/main/java/net/minecraft/server/LegacyPingHandler.java
|
|
@@ -14,6 +14,7 @@ public class LegacyPingHandler extends ChannelInboundHandlerAdapter {
|
|
|
|
private static final Logger a = LogManager.getLogger();
|
|
private final ServerConnection b;
|
|
+ private ByteBuf buf; // Paper
|
|
|
|
public LegacyPingHandler(ServerConnection serverconnection) {
|
|
this.b = serverconnection;
|
|
@@ -21,7 +22,16 @@ public class LegacyPingHandler extends ChannelInboundHandlerAdapter {
|
|
|
|
public void channelRead(ChannelHandlerContext channelhandlercontext, Object object) throws Exception {
|
|
ByteBuf bytebuf = (ByteBuf) object;
|
|
-
|
|
+ // Paper start - Make legacy ping handler more reliable
|
|
+ if (this.buf != null) {
|
|
+ try {
|
|
+ readLegacy1_6(channelhandlercontext, bytebuf);
|
|
+ } finally {
|
|
+ bytebuf.release();
|
|
+ }
|
|
+ return;
|
|
+ }
|
|
+ // Paper end
|
|
bytebuf.markReaderIndex();
|
|
boolean flag = true;
|
|
|
|
@@ -50,6 +60,10 @@ public class LegacyPingHandler extends ChannelInboundHandlerAdapter {
|
|
break;
|
|
|
|
default:
|
|
+ // Paper start - Replace with improved version below
|
|
+ if (bytebuf.readUnsignedByte() != 0x01 || bytebuf.readUnsignedByte() != 0xFA) return;
|
|
+ readLegacy1_6(channelhandlercontext, bytebuf);
|
|
+ /*
|
|
boolean flag1 = bytebuf.readUnsignedByte() == 1;
|
|
|
|
flag1 &= bytebuf.readUnsignedByte() == 250;
|
|
@@ -73,6 +87,8 @@ public class LegacyPingHandler extends ChannelInboundHandlerAdapter {
|
|
} finally {
|
|
bytebuf1.release();
|
|
}
|
|
+ */
|
|
+ // Paper end
|
|
}
|
|
|
|
bytebuf.release();
|
|
@@ -92,6 +108,74 @@ public class LegacyPingHandler extends ChannelInboundHandlerAdapter {
|
|
|
|
}
|
|
|
|
+ // Paper start
|
|
+ private void readLegacy1_6(ChannelHandlerContext ctx, ByteBuf part) {
|
|
+ ByteBuf buf = this.buf;
|
|
+
|
|
+ if (buf == null) {
|
|
+ this.buf = buf = ctx.alloc().buffer();
|
|
+ buf.markReaderIndex();
|
|
+ } else {
|
|
+ buf.resetReaderIndex();
|
|
+ }
|
|
+
|
|
+ buf.writeBytes(part);
|
|
+
|
|
+ // Short + Short + Byte + Short + Int
|
|
+ if (!buf.isReadable(2 + 2 + 1 + 2 + 4)) {
|
|
+ return;
|
|
+ }
|
|
+
|
|
+ short length = buf.readShort();
|
|
+ if (!buf.isReadable(length * 2)) {
|
|
+ return;
|
|
+ }
|
|
+
|
|
+ if (!buf.readBytes(length * 2).toString(StandardCharsets.UTF_16BE).equals("MC|PingHost")) {
|
|
+ removeHandler(ctx);
|
|
+ return;
|
|
+ }
|
|
+
|
|
+ if (!buf.isReadable(2)) {
|
|
+ return;
|
|
+ }
|
|
+
|
|
+ length = buf.readShort();
|
|
+ if (!buf.isReadable(length)) {
|
|
+ return;
|
|
+ }
|
|
+
|
|
+ MinecraftServer server = this.b.d();
|
|
+ int protocolVersion = buf.readByte();
|
|
+ length = buf.readShort();
|
|
+ String host = buf.readBytes(length * 2).toString(StandardCharsets.UTF_16BE);
|
|
+ int port = buf.readInt();
|
|
+
|
|
+ if (buf.isReadable()) {
|
|
+ removeHandler(ctx);
|
|
+ return;
|
|
+ }
|
|
+
|
|
+ buf.release();
|
|
+ this.buf = null;
|
|
+
|
|
+ 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());
|
|
+ this.a(ctx, this.a(response));
|
|
+ }
|
|
+
|
|
+ private void removeHandler(ChannelHandlerContext ctx) {
|
|
+ ByteBuf buf = this.buf;
|
|
+ this.buf = null;
|
|
+
|
|
+ buf.resetReaderIndex();
|
|
+ ctx.pipeline().remove("legacy_query");
|
|
+ ctx.fireChannelRead(buf);
|
|
+ }
|
|
+ // Paper end
|
|
+
|
|
private void a(ChannelHandlerContext channelhandlercontext, ByteBuf bytebuf) {
|
|
channelhandlercontext.pipeline().firstContext().writeAndFlush(bytebuf).addListener(ChannelFutureListener.CLOSE);
|
|
}
|
|
--
|
|
2.14.3
|
|
|