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Upstream has released updates that appears to apply and compile correctly. This update has not been tested by PaperMC and as with ANY update, please do your own testing Bukkit Changes: da08d022 SPIGOT-4700: Add PlayerFishEvent.State.REEL_IN 0cef14e4 Remove draft API from selectEntities CraftBukkit Changes:a46fdbc6
Remove outdated build delay.3697519b
SPIGOT-4708: Fix ExactChoice recipes neglecting material9ead7009
SPIGOT-4677: Add minecraft.admin.command_feedback permissionc3749a23
Remove the Damage tag from items when it is 0.f74c7b95
SPIGOT-4706: Can't interact with active item494eef45
Mention requirement of JIRA ticket for bug fixes51d62dec
SPIGOT-4702: Exception when middle clicking certain slotsbe557e69
SPIGOT-4700: Add PlayerFishEvent.State.REEL_IN
172 lines
6.0 KiB
Diff
172 lines
6.0 KiB
Diff
From 7c84ab3fa1f74dec63abd7d7af1163e1d98f2d73 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 18:22:50 +0200
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Subject: [PATCH] Make legacy ping handler more reliable
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The Minecraft server often fails to respond to old ("legacy") pings
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from old Minecraft versions using the protocol used before the switch
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to Netty in Minecraft 1.7.
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Due to packet fragmentation[1], we might not have all needed bytes
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available when the LegacyPingHandler is called. In this case, it will
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run into an error, remove the handler and continue using the modern
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protocol.
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This is unlikely to happen for the first two revisions of the legacy
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ping protocol (used in Minecraft 1.5.x and older) since the request
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consists of only one or two bytes, but happens frequently for the
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last/third revision introduced in Minecraft 1.6.
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It has much larger, variable packet sizes due to the inclusion of
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the virtual host (the hostname/port used to connect to the server).
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The solution[2] is simple: If we find more than two matching bytes,
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we buffer the remaining bytes until we have enough to fully read and
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respond to the request.
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[1]: https://netty.io/wiki/user-guide-for-4.x.html#wiki-h3-11
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[2]: https://netty.io/wiki/user-guide-for-4.x.html#wiki-h4-13
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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 204aa82298..2a99f34df6 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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@@ -14,6 +14,7 @@ public class LegacyPingHandler extends ChannelInboundHandlerAdapter {
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private static final Logger a = LogManager.getLogger();
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private final ServerConnection b;
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+ private ByteBuf buf; // Paper
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public LegacyPingHandler(ServerConnection serverconnection) {
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this.b = serverconnection;
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@@ -22,6 +23,16 @@ public class LegacyPingHandler extends ChannelInboundHandlerAdapter {
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public void channelRead(ChannelHandlerContext channelhandlercontext, Object object) throws Exception {
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ByteBuf bytebuf = (ByteBuf) object;
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+ // Paper start - Make legacy ping handler more reliable
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+ if (this.buf != null) {
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+ try {
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+ readLegacy1_6(channelhandlercontext, bytebuf);
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+ } finally {
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+ bytebuf.release();
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+ }
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+ return;
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+ }
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+ // Paper end
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bytebuf.markReaderIndex();
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boolean flag = true;
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@@ -52,6 +63,10 @@ public class LegacyPingHandler extends ChannelInboundHandlerAdapter {
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this.a(channelhandlercontext, this.a(s));
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break;
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default:
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+ // Paper start - Replace with improved version below
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+ if (bytebuf.readUnsignedByte() != 0x01 || bytebuf.readUnsignedByte() != 0xFA) return;
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+ readLegacy1_6(channelhandlercontext, bytebuf);
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+ /*
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boolean flag1 = bytebuf.readUnsignedByte() == 1;
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flag1 &= bytebuf.readUnsignedByte() == 250;
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@@ -75,6 +90,7 @@ public class LegacyPingHandler extends ChannelInboundHandlerAdapter {
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} finally {
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bytebuf1.release();
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}
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+ */ // Paper end - Replace with improved version below
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}
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bytebuf.release();
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@@ -92,6 +108,90 @@ public class LegacyPingHandler extends ChannelInboundHandlerAdapter {
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}
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+ // Paper start
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+ private static String readLegacyString(ByteBuf buf) {
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+ int size = buf.readShort() * Character.BYTES;
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+ if (!buf.isReadable(size)) {
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+ return null;
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+ }
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+
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+ String result = buf.toString(buf.readerIndex(), size, StandardCharsets.UTF_16BE);
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+ buf.skipBytes(size); // toString doesn't increase readerIndex automatically
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+ return result;
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+ }
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+
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+ private void readLegacy1_6(ChannelHandlerContext ctx, ByteBuf part) {
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+ ByteBuf buf = this.buf;
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+
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+ if (buf == null) {
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+ this.buf = buf = ctx.alloc().buffer();
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+ buf.markReaderIndex();
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+ } else {
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+ buf.resetReaderIndex();
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+ }
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+
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+ buf.writeBytes(part);
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+
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+ if (!buf.isReadable(Short.BYTES + Short.BYTES + Byte.BYTES + Short.BYTES + Integer.BYTES)) {
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+ return;
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+ }
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+
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+ String s = readLegacyString(buf);
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+ if (s == null) {
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+ return;
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+ }
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+
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+ if (!s.equals("MC|PingHost")) {
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+ removeHandler(ctx);
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+ return;
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+ }
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+
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+ if (!buf.isReadable(Short.BYTES) || !buf.isReadable(buf.readShort())) {
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+ return;
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+ }
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+
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+ MinecraftServer server = this.b.d();
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+ int protocolVersion = buf.readByte();
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+ String host = readLegacyString(buf);
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+ if (host == null) {
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+ removeHandler(ctx);
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+ return;
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+ }
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+ int port = buf.readInt();
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+
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+ if (buf.isReadable()) {
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+ removeHandler(ctx);
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+ return;
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+ }
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+
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+ buf.release();
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+ this.buf = null;
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+
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+ a.debug("Ping: (1.6) from {}", ctx.channel().remoteAddress());
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+
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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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+ this.a(ctx, this.a(response));
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+ }
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+
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+ private void removeHandler(ChannelHandlerContext ctx) {
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+ ByteBuf buf = this.buf;
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+ this.buf = null;
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+
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+ buf.resetReaderIndex();
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+ ctx.pipeline().remove(this);
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+ ctx.fireChannelRead(buf);
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+ }
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+
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+ @Override
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+ public void handlerRemoved(ChannelHandlerContext ctx) {
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+ if (this.buf != null) {
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+ this.buf.release();
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+ this.buf = null;
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+ }
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+ }
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+ // Paper end
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+
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private void a(ChannelHandlerContext channelhandlercontext, ByteBuf bytebuf) {
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channelhandlercontext.pipeline().firstContext().writeAndFlush(bytebuf).addListener(ChannelFutureListener.CLOSE);
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}
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--
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2.21.0
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