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Protocol: modernise plugin message handling (#5325) 

- Remove handling for garbage data in command block sets
+ Add correct boolean value read (#1692)
* Make better use of namespaced-id and string_view
This commit is contained in:
Tiger Wang 2021-11-23 17:16:25 +00:00 committed by GitHub
parent 8b4fca4ec5
commit 7c7890c658
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GPG Key ID: 4AEE18F83AFDEB23
6 changed files with 134 additions and 69 deletions
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32
src/Protocol/Protocol_1_13.cpp
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@ -30,6 +30,7 @@ Implements the 1.13 protocol classes:
#include "../World.h"
#include "../JsonUtils.h"
#include "../WorldStorage/FastNBT.h"
#include "WorldStorage/NamespaceSerializer.h"
#include "../Bindings/PluginManager.h"
@ -658,24 +659,22 @@ bool cProtocol_1_13::HandlePacket(cByteBuffer & a_ByteBuffer, UInt32 a_PacketTyp
void cProtocol_1_13::HandlePacketPluginMessage(cByteBuffer & a_ByteBuffer)
{
HANDLE_READ(a_ByteBuffer, ReadVarUTF8String, AString, Channel);
HANDLE_READ(a_ByteBuffer, ReadVarUTF8String, AString, NamespacedChannel);
const auto & [Namespace, Channel] = NamespaceSerializer::SplitNamespacedID(NamespacedChannel);
// If the plugin channel is recognized vanilla, handle it directly:
if (Channel.substr(0, 15) == "minecraft:brand")
if (Namespace == NamespaceSerializer::Namespace::Minecraft)
{
HANDLE_READ(a_ByteBuffer, ReadVarUTF8String, AString, Brand);
m_Client->SetClientBrand(Brand);
// Send back our brand, including the length:
m_Client->SendPluginMessage("minecraft:brand", "\x08""Cuberite");
HandleVanillaPluginMessage(a_ByteBuffer, Channel);
return;
}
ContiguousByteBuffer Data;
// Read the plugin message and relay to clienthandle:
VERIFY(a_ByteBuffer.ReadSome(Data, a_ByteBuffer.GetReadableSpace())); // Always succeeds
m_Client->HandlePluginMessage(Channel, Data);
a_ByteBuffer.ReadSome(Data, a_ByteBuffer.GetReadableSpace());
m_Client->HandlePluginMessage(NamespacedChannel, Data);
}
@ -693,6 +692,21 @@ void cProtocol_1_13::HandlePacketSetBeaconEffect(cByteBuffer & a_ByteBuffer)
void cProtocol_1_13::HandleVanillaPluginMessage(cByteBuffer & a_ByteBuffer, const std::string_view a_Channel)
{
if (a_Channel == "brand")
{
HANDLE_READ(a_ByteBuffer, ReadVarUTF8String, AString, Brand);
m_Client->SetClientBrand(Brand);
m_Client->SendPluginMessage("brand", "\x08""Cuberite"); // Send back our brand, including the length.
}
}
bool cProtocol_1_13::ReadItem(cByteBuffer & a_ByteBuffer, cItem & a_Item, size_t a_KeepRemainingBytes) const
{
HANDLE_PACKET_READ(a_ByteBuffer, ReadBEInt16, Int16, ItemID);

1
src/Protocol/Protocol_1_13.h
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@ -59,6 +59,7 @@ protected:
virtual bool HandlePacket(cByteBuffer & a_ByteBuffer, UInt32 a_PacketType) override;
virtual void HandlePacketPluginMessage(cByteBuffer & a_ByteBuffer) override;
virtual void HandlePacketSetBeaconEffect(cByteBuffer & a_ByteBuffer);
virtual void HandleVanillaPluginMessage(cByteBuffer & a_ByteBuffer, std::string_view a_Channel) override;
virtual bool ReadItem(cByteBuffer & a_ByteBuffer, cItem & a_Item, size_t a_KeepRemainingBytes) const override;
virtual void WriteEntityMetadata(cPacketizer & a_Pkt, EntityMetadata a_Metadata, EntityMetadataType a_FieldType) const;

113
src/Protocol/Protocol_1_8.cpp
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@ -2554,28 +2554,23 @@ void cProtocol_1_8_0::HandlePacketPlayerPosLook(cByteBuffer & a_ByteBuffer)
void cProtocol_1_8_0::HandlePacketPluginMessage(cByteBuffer & a_ByteBuffer)
{
// https://wiki.vg/index.php?title=Plugin_channels&oldid=14089#MC.7CAdvCmd
HANDLE_READ(a_ByteBuffer, ReadVarUTF8String, AString, Channel);
const std::string_view ChannelView = Channel;
// If the plugin channel is recognized vanilla, handle it directly:
if (Channel.substr(0, 3) == "MC|")
if (ChannelView.substr(0, 3) == "MC|")
{
HandleVanillaPluginMessage(a_ByteBuffer, Channel);
// Skip any unread data (vanilla sometimes sends garbage at the end of a packet; #1692):
if (a_ByteBuffer.GetReadableSpace() > 0)
{
LOGD("Protocol 1.8: Skipping garbage data at the end of a vanilla PluginMessage packet, %u bytes",
static_cast<unsigned>(a_ByteBuffer.GetReadableSpace())
);
a_ByteBuffer.SkipRead(a_ByteBuffer.GetReadableSpace());
}
HandleVanillaPluginMessage(a_ByteBuffer, ChannelView.substr(3));
return;
}
// Read the plugin message and relay to clienthandle:
ContiguousByteBuffer Data;
VERIFY(a_ByteBuffer.ReadSome(Data, a_ByteBuffer.GetReadableSpace())); // Always succeeds
// Read the plugin message and relay to clienthandle:
a_ByteBuffer.ReadSome(Data, a_ByteBuffer.GetReadableSpace());
m_Client->HandlePluginMessage(Channel, Data);
}
@ -2807,81 +2802,83 @@ void cProtocol_1_8_0::HandlePacketWindowClose(cByteBuffer & a_ByteBuffer)
void cProtocol_1_8_0::HandleVanillaPluginMessage(cByteBuffer & a_ByteBuffer, const AString & a_Channel)
void cProtocol_1_8_0::HandleVanillaPluginMessage(cByteBuffer & a_ByteBuffer, const std::string_view a_Channel)
{
if ((a_Channel == "MC|AdvCdm") || (a_Channel == "MC|AdvCmd")) // Spelling was fixed in 15w34
if ((a_Channel == "AdvCdm") || (a_Channel == "AdvCmd")) // Spelling was fixed in 15w34.
{
// https://wiki.vg/index.php?title=Plugin_channels&oldid=14089#MC.7CAdvCmd
HANDLE_READ(a_ByteBuffer, ReadBEUInt8, UInt8, Dest);
HANDLE_READ(a_ByteBuffer, ReadBEUInt8, UInt8, Type);
switch (Dest)
switch (Type)
{
case 0x00:
{
// Editing a command-block
HANDLE_READ(a_ByteBuffer, ReadBEInt32, Int32, BlockX);
HANDLE_READ(a_ByteBuffer, ReadBEInt32, Int32, BlockY);
HANDLE_READ(a_ByteBuffer, ReadBEInt32, Int32, BlockZ);
HANDLE_READ(a_ByteBuffer, ReadVarUTF8String, AString, Command);
HANDLE_READ(a_ByteBuffer, ReadBool, bool, TrackOutput);
// Editing a command-block:
m_Client->HandleCommandBlockBlockChange(BlockX, BlockY, BlockZ, Command);
break;
}
case 0x01:
{
// Editing a command-block-minecart
HANDLE_READ(a_ByteBuffer, ReadBEUInt32, UInt32, EntityID);
HANDLE_READ(a_ByteBuffer, ReadVarUTF8String, AString, Command);
m_Client->HandleCommandBlockEntityChange(EntityID, Command);
break;
}
default:
{
m_Client->SendChat(Printf("Failure setting command block command; unhandled destination %u (0x%02x)", Dest, Dest), mtFailure);
LOG("Unhandled MC|AdvCmd packet destination.");
return;
}
} // switch (Mode)
return;
}
else if (a_Channel == "MC|Brand")
{
HANDLE_READ(a_ByteBuffer, ReadVarUTF8String, AString, Brand);
case 0x01:
{
HANDLE_READ(a_ByteBuffer, ReadBEUInt32, UInt32, EntityID);
HANDLE_READ(a_ByteBuffer, ReadVarUTF8String, AString, Command);
HANDLE_READ(a_ByteBuffer, ReadBool, bool, TrackOutput);
m_Client->SetClientBrand(Brand);
// Send back our brand, including the length:
m_Client->SendPluginMessage("MC|Brand", "\x08""Cuberite");
return;
// Editing a command-block-minecart:
m_Client->HandleCommandBlockEntityChange(EntityID, Command);
return;
}
default:
{
m_Client->Kick("Unknown command block edit type - hacked client?");
return;
}
}
}
else if (a_Channel == "MC|Beacon")
else if (a_Channel == "Beacon")
{
HANDLE_READ(a_ByteBuffer, ReadBEUInt32, UInt32, Effect1);
HANDLE_READ(a_ByteBuffer, ReadBEUInt32, UInt32, Effect2);
m_Client->HandleBeaconSelection(Effect1, Effect2);
return;
}
else if (a_Channel == "MC|ItemName")
else if (a_Channel == "BEdit")
{
if (cItem UnsignedBook; ReadItem(a_ByteBuffer, UnsignedBook))
{
// TODO: m_Client->HandleBookEdit
}
}
else if (a_Channel == "BSign")
{
if (cItem WrittenBook; ReadItem(a_ByteBuffer, WrittenBook))
{
// TODO: m_Client->HandleBookSign
}
}
else if (a_Channel == "Brand")
{
HANDLE_READ(a_ByteBuffer, ReadVarUTF8String, AString, Brand);
m_Client->SetClientBrand(Brand);
m_Client->SendPluginMessage("MC|Brand", "\x08""Cuberite"); // Send back our brand, including the length.
}
else if (a_Channel == "ItemName")
{
HANDLE_READ(a_ByteBuffer, ReadVarUTF8String, AString, ItemName);
m_Client->HandleAnvilItemName(ItemName);
return;
}
else if (a_Channel == "MC|TrSel")
else if (a_Channel == "TrSel")
{
HANDLE_READ(a_ByteBuffer, ReadBEInt32, Int32, SlotNum);
m_Client->HandleNPCTrade(SlotNum);
return;
}
LOG("Unhandled vanilla plugin channel: \"%s\".", a_Channel.c_str());
// Read the payload and send it through to the clienthandle:
ContiguousByteBuffer Message;
VERIFY(a_ByteBuffer.ReadSome(Message, a_ByteBuffer.GetReadableSpace()));
m_Client->HandlePluginMessage(a_Channel, Message);
}

4
src/Protocol/Protocol_1_8.h
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@ -201,8 +201,8 @@ protected:
virtual void HandlePacketWindowClose (cByteBuffer & a_ByteBuffer);
/** Parses Vanilla plugin messages into specific ClientHandle calls.
The message payload is still in the bytebuffer, the handler reads it specifically for each handled channel */
virtual void HandleVanillaPluginMessage(cByteBuffer & a_ByteBuffer, const AString & a_Channel);
The message payload is still in the bytebuffer, the handler reads it specifically for each handled channel. */
virtual void HandleVanillaPluginMessage(cByteBuffer & a_ByteBuffer, std::string_view a_Channel);
/** Parses item metadata as read by ReadItem(), into the item enchantments. */
virtual void ParseItemMetadata(cItem & a_Item, ContiguousByteBufferView a_Metadata) const;

52
src/Protocol/Protocol_1_9.cpp
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@ -1197,6 +1197,58 @@ void cProtocol_1_9_0::HandlePacketWindowClick(cByteBuffer & a_ByteBuffer)
void cProtocol_1_9_0::HandleVanillaPluginMessage(cByteBuffer & a_ByteBuffer, std::string_view a_Channel)
{
if (a_Channel == "AutoCmd")
{
HANDLE_READ(a_ByteBuffer, ReadBEInt32, Int32, BlockX);
HANDLE_READ(a_ByteBuffer, ReadBEInt32, Int32, BlockY);
HANDLE_READ(a_ByteBuffer, ReadBEInt32, Int32, BlockZ);
HANDLE_READ(a_ByteBuffer, ReadVarUTF8String, AString, Command);
HANDLE_READ(a_ByteBuffer, ReadBool, bool, TrackOutput);
HANDLE_READ(a_ByteBuffer, ReadVarUTF8String, AString, Mode);
HANDLE_READ(a_ByteBuffer, ReadBool, bool, Conditional);
HANDLE_READ(a_ByteBuffer, ReadBool, bool, Automatic);
m_Client->HandleCommandBlockBlockChange(BlockX, BlockY, BlockZ, Command);
}
else if (a_Channel == "PickItem")
{
HANDLE_READ(a_ByteBuffer, ReadVarInt32, UInt32, InventorySlotIndex);
}
else if (a_Channel == "Struct")
{
HANDLE_READ(a_ByteBuffer, ReadBEInt32, Int32, BlockX);
HANDLE_READ(a_ByteBuffer, ReadBEInt32, Int32, BlockY);
HANDLE_READ(a_ByteBuffer, ReadBEInt32, Int32, BlockZ);
HANDLE_READ(a_ByteBuffer, ReadBEUInt8, UInt8, Action);
HANDLE_READ(a_ByteBuffer, ReadVarUTF8String, AString, Mode);
HANDLE_READ(a_ByteBuffer, ReadVarUTF8String, AString, Name);
HANDLE_READ(a_ByteBuffer, ReadBEInt32, Int32, OffsetX);
HANDLE_READ(a_ByteBuffer, ReadBEInt32, Int32, OffsetY);
HANDLE_READ(a_ByteBuffer, ReadBEInt32, Int32, OffsetZ);
HANDLE_READ(a_ByteBuffer, ReadBEUInt32, UInt32, SizeX);
HANDLE_READ(a_ByteBuffer, ReadBEUInt32, UInt32, SizeY);
HANDLE_READ(a_ByteBuffer, ReadBEUInt32, UInt32, SizeZ);
HANDLE_READ(a_ByteBuffer, ReadVarUTF8String, AString, Mirror);
HANDLE_READ(a_ByteBuffer, ReadVarUTF8String, AString, Rotation);
HANDLE_READ(a_ByteBuffer, ReadVarUTF8String, AString, Metadata);
HANDLE_READ(a_ByteBuffer, ReadBool, bool, IgnoreEntities);
HANDLE_READ(a_ByteBuffer, ReadBool, bool, ShowAir);
HANDLE_READ(a_ByteBuffer, ReadBool, bool, ShowBoundingBox);
HANDLE_READ(a_ByteBuffer, ReadBEFloat, float, Integrity);
HANDLE_READ(a_ByteBuffer, ReadVarInt64, UInt64, Seed);
}
else
{
Super::HandleVanillaPluginMessage(a_ByteBuffer, a_Channel);
}
}
void cProtocol_1_9_0::ParseItemMetadata(cItem & a_Item, const ContiguousByteBufferView a_Metadata) const
{
// Parse into NBT:

1
src/Protocol/Protocol_1_9.h
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@ -90,6 +90,7 @@ protected:
virtual void HandlePacketUseItem (cByteBuffer & a_ByteBuffer);
virtual void HandlePacketVehicleMove (cByteBuffer & a_ByteBuffer);
virtual void HandlePacketWindowClick (cByteBuffer & a_ByteBuffer) override;
virtual void HandleVanillaPluginMessage (cByteBuffer & a_ByteBuffer, std::string_view a_Channel) override;
virtual void ParseItemMetadata(cItem & a_Item, ContiguousByteBufferView a_Metadata) const override;
virtual void SendEntitySpawn(const cEntity & a_Entity, const UInt8 a_ObjectType, const Int32 a_ObjectData) override;