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// Protocol17x.cpp
/*
Implements the 1.7.x protocol classes:
- cProtocol172
- release 1.7.2 protocol (#4)
(others may be added later in the future for the 1.7 release series)
*/
#include "Globals.h"
#include "Protocol17x.h"
#include "../ClientHandle.h"
#include "../Root.h"
#include "../Server.h"
cProtocol172::cProtocol172(cClientHandle * a_Client, const AString & a_ServerAddress, UInt16 a_ServerPort, UInt32 a_State) :
super(a_Client),
m_ServerAddress(a_ServerAddress),
m_ServerPort(a_ServerPort),
m_State(a_State),
m_ReceivedData(32 KiB),
m_IsEncrypted(false)
{
}
void cProtocol172::DataReceived(const char * a_Data, int a_Size)
{
if (m_IsEncrypted)
{
byte Decrypted[512];
while (a_Size > 0)
{
int NumBytes = (a_Size > sizeof(Decrypted)) ? sizeof(Decrypted) : a_Size;
m_Decryptor.ProcessData(Decrypted, (byte *)a_Data, NumBytes);
AddReceivedData((const char *)Decrypted, NumBytes);
a_Size -= NumBytes;
a_Data += NumBytes;
}
}
else
{
AddReceivedData(a_Data, a_Size);
}
}
void cProtocol172::AddReceivedData(const char * a_Data, int a_Size)
{
if (!m_ReceivedData.Write(a_Data, a_Size))
{
// Too much data in the incoming queue, report to caller:
m_Client->PacketBufferFull();
return;
}
// Handle all complete packets:
while (true)
{
UInt32 PacketLen;
if (!m_ReceivedData.ReadVarInt(PacketLen))
{
// Not enough data
return;
}
if (!m_ReceivedData.CanReadBytes(PacketLen))
{
// The full packet hasn't been received yet
return;
}
UInt32 PacketType;
UInt32 NumBytesRead = m_ReceivedData.GetReadableSpace();
if (!m_ReceivedData.ReadVarInt(PacketType))
{
// Not enough data
return;
}
NumBytesRead -= m_ReceivedData.GetReadableSpace();
HandlePacket(PacketType, PacketLen - NumBytesRead);
} // while (true)
}
void cProtocol172::HandlePacket(UInt32 a_PacketType, UInt32 a_RemainingBytes)
{
switch (m_State)
{
case 1:
{
// Status
switch (a_PacketType)
{
case 0x00: HandlePacketStatusRequest(a_RemainingBytes); return;
case 0x01: HandlePacketStatusPing (a_RemainingBytes); return;
}
break;
}
case 2:
{
// Login
break;
}
case 3:
{
// Game
break;
}
} // switch (m_State)
// Unknown packet type, report to the client:
m_Client->PacketUnknown(a_PacketType);
m_ReceivedData.SkipRead(a_RemainingBytes);
m_ReceivedData.CommitRead();
}
void cProtocol172::HandlePacketStatusRequest(UInt32 a_RemainingBytes)
{
// No more bytes in this packet
ASSERT(a_RemainingBytes == 0);
m_ReceivedData.CommitRead();
// Send the response:
AString Response = "{\"version\":{\"name\":\"1.7.2\",\"protocol\":4},\"players\":{";
AppendPrintf(Response, "\"max\":%u,\"online\":%u,\"sample\":[]},",
cRoot::Get()->GetServer()->GetMaxPlayers(),
cRoot::Get()->GetServer()->GetNumPlayers()
);
AppendPrintf(Response, "\"description\":{\"text\":\"%s\"}",
cRoot::Get()->GetServer()->GetDescription().c_str()
);
Response.append("}");
cByteBuffer Packet(Response.size() + 10);
Packet.WriteVarInt(0x00); // Response packet
Packet.WriteVarUTF8String(Response);
WritePacket(Packet);
}
void cProtocol172::HandlePacketStatusPing(UInt32 a_RemainingBytes)
{
ASSERT(a_RemainingBytes == 8);
if (a_RemainingBytes != 8)
{
m_Client->PacketError(0x01);
m_ReceivedData.SkipRead(a_RemainingBytes);
m_ReceivedData.CommitRead();
return;
}
Int64 Timestamp;
m_ReceivedData.ReadBEInt64(Timestamp);
m_ReceivedData.CommitRead();
cByteBuffer Packet(18);
Packet.WriteVarInt(0x01);
Packet.WriteBEInt64(Timestamp);
WritePacket(Packet);
}
void cProtocol172::WritePacket(cByteBuffer & a_Packet)
{
cCSLock Lock(m_CSPacket);
AString Pkt;
a_Packet.ReadAll(Pkt);
WriteVarInt(Pkt.size());
SendData(Pkt.data(), Pkt.size());
Flush();
}
void cProtocol172::SendData(const char * a_Data, int a_Size)
{
m_DataToSend.append(a_Data, a_Size);
}
void cProtocol172::Flush(void)
{
ASSERT(m_CSPacket.IsLockedByCurrentThread()); // Did all packets lock the CS properly?
if (m_DataToSend.empty())
{
LOGD("Flushing empty");
return;
}
const char * a_Data = m_DataToSend.data();
int a_Size = m_DataToSend.size();
if (m_IsEncrypted)
{
byte Encrypted[8192]; // Larger buffer, we may be sending lots of data (chunks)
while (a_Size > 0)
{
int NumBytes = (a_Size > sizeof(Encrypted)) ? sizeof(Encrypted) : a_Size;
m_Encryptor.ProcessData(Encrypted, (byte *)a_Data, NumBytes);
m_Client->SendData((const char *)Encrypted, NumBytes);
a_Size -= NumBytes;
a_Data += NumBytes;
}
}
else
{
m_Client->SendData(a_Data, a_Size);
}
m_DataToSend.clear();
}
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