// Connection.cpp
// Interfaces to the cConnection class representing a single pair of connected sockets
#include "Globals.h"
#include "Connection.h"
#include "Server.h"
#include <iostream>
#define HANDLE_CLIENT_PACKET_READ(Proc, Type, Var) \
Type Var; \
{ \
if (!m_ClientBuffer.Proc(Var)) \
{ \
return false; \
} \
}
#define HANDLE_SERVER_PACKET_READ(Proc, Type, Var) \
Type Var; \
{ \
if (!m_ServerBuffer.Proc(Var)) \
{ \
return false; \
} \
}
#define CLIENTSEND(...) SendData(m_ClientSocket, __VA_ARGS__, "Client")
#define SERVERSEND(...) SendData(m_ServerSocket, __VA_ARGS__, "Server")
#define CLIENTENCRYPTSEND(...) SendEncryptedData(m_ClientSocket, m_ClientEncryptor, __VA_ARGS__, "Client")
#define SERVERENCRYPTSEND(...) SendEncryptedData(m_ServerSocket, m_ServerEncryptor, __VA_ARGS__, "Server")
#define COPY_TO_SERVER() \
{ \
AString ToServer; \
m_ClientBuffer.ReadAgain(ToServer); \
if (m_ServerState == csUnencrypted) \
{ \
SERVERSEND(ToServer.data(), ToServer.size()); \
} \
else \
{ \
SERVERENCRYPTSEND(ToServer.data(), ToServer.size()); \
} \
}
#define COPY_TO_CLIENT() \
{ \
AString ToClient; \
m_ServerBuffer.ReadAgain(ToClient); \
if (m_ClientState == csUnencrypted) \
{ \
CLIENTSEND(ToClient.data(), ToClient.size()); \
} \
else \
{ \
CLIENTENCRYPTSEND(ToClient.data(), ToClient.size()); \
} \
}
#define HANDLE_CLIENT_READ(Proc) \
{ \
if (!Proc()) \
{ \
AString Leftover; \
m_ClientBuffer.ReadAgain(Leftover); \
DataLog(Leftover.data(), Leftover.size(), "Leftover data after client packet parsing, %d bytes:", Leftover.size()); \
m_ClientBuffer.ResetRead(); \
return true; \
} \
}
#define HANDLE_SERVER_READ(Proc) \
{ \
if (!Proc()) \
{ \
m_ServerBuffer.ResetRead(); \
return true; \
} \
}
#define MAX_ENC_LEN 1024
typedef unsigned char Byte;
enum
{
PACKET_KEEPALIVE = 0x00,
PACKET_LOGIN = 0x01,
PACKET_HANDSHAKE = 0x02,
PACKET_CHAT_MESSAGE = 0x03,
PACKET_TIME_UPDATE = 0x04,
PACKET_ENTITY_EQUIPMENT = 0x05,
PACKET_COMPASS = 0x06,
PACKET_USE_ENTITY = 0x07,
PACKET_UPDATE_HEALTH = 0x08,
PACKET_PLAYER_ON_GROUND = 0x0a,
PACKET_PLAYER_POSITION = 0x0b,
PACKET_PLAYER_LOOK = 0x0c,
PACKET_PLAYER_POSITION_LOOK = 0x0d,
PACKET_BLOCK_PLACE = 0x0f,
PACKET_SLOT_SELECT = 0x10,
PACKET_ANIMATION = 0x12,
PACKET_MAP_CHUNK = 0x33,
PACKET_MULTI_BLOCK_CHANGE = 0x34,
PACKET_BLOCK_CHANGE = 0x35,
PACKET_CHANGE_GAME_STATE = 0x46,
PACKET_WINDOW_CLOSE = 0x65,
PACKET_WINDOW_CLICK = 0x66,
PACKET_SET_SLOT = 0x67,
PACKET_WINDOW_CONTENTS = 0x68,
PACKET_CREATIVE_INVENTORY_ACTION = 0x6b,
PACKET_UPDATE_SIGN = 0x82,
PACKET_PLAYER_LIST_ITEM = 0xc9,
PACKET_PLAYER_ABILITIES = 0xca,
PACKET_LOCALE_AND_VIEW = 0xcc,
PACKET_CLIENT_STATUSES = 0xcd,
PACKET_ENCRYPTION_KEY_RESPONSE = 0xfc,
PACKET_ENCRYPTION_KEY_REQUEST = 0xfd,
PACKET_PING = 0xfe,
PACKET_KICK = 0xff,
} ;
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// cConnection:
cConnection::cConnection(SOCKET a_ClientSocket, cServer & a_Server) :
m_Server(a_Server),
m_LogFile(NULL),
m_ClientSocket(a_ClientSocket),
m_ServerSocket(-1),
m_BeginTick(clock()),
m_ClientState(csUnencrypted),
m_ServerState(csUnencrypted),
m_ClientBuffer(1024 KiB),
m_ServerBuffer(1024 KiB),
m_Nonce(0)
{
AString fnam;
Printf(fnam, "Log_%d.log", (int)time(NULL));
m_LogFile = fopen(fnam.c_str(), "w");
Log("Log file created");
}
cConnection::~cConnection()
{
fclose(m_LogFile);
}
void cConnection::Run(void)
{
if (!ConnectToServer())
{
Log("Cannot connect to server; aborting");
return;
}
while (true)
{
fd_set ReadFDs;
FD_ZERO(&ReadFDs);
FD_SET(m_ServerSocket, &ReadFDs);
FD_SET(m_ClientSocket, &ReadFDs);
int res = select(2, &ReadFDs, NULL, NULL, NULL);
if (res <= 0)
{
printf("select() failed: %d; aborting client", WSAGetLastError());
break;
}
if (FD_ISSET(m_ServerSocket, &ReadFDs))
{
if (!RelayFromServer())
{
break;
}
}
if (FD_ISSET(m_ClientSocket, &ReadFDs))
{
if (!RelayFromClient())
{
break;
}
}
}
Log("Relaying ended, closing sockets");
closesocket(m_ServerSocket);
closesocket(m_ClientSocket);
}
void cConnection::Log(const char * a_Format, ...)
{
va_list args;
va_start(args, a_Format);
AString msg;
AppendVPrintf(msg, a_Format, args);
va_end(args);
AString FullMsg;
Printf(FullMsg, "[%5.3f] %s\n", GetRelativeTime(), msg.c_str());
// Log to file:
cCSLock Lock(m_CSLog);
fputs(FullMsg.c_str(), m_LogFile);
// Log to screen:
std::cout << FullMsg;
}
void cConnection::DataLog(const void * a_Data, int a_Size, const char * a_Format, ...)
{
va_list args;
va_start(args, a_Format);
AString msg;
AppendVPrintf(msg, a_Format, args);
va_end(args);
AString FullMsg;
AString Hex;
Printf(FullMsg, "[%5.3f] %s\n%s\n", GetRelativeTime(), msg.c_str(), CreateHexDump(Hex, a_Data, a_Size, 16).c_str());
// Log to file:
cCSLock Lock(m_CSLog);
fputs(FullMsg.c_str(), m_LogFile);
/*
// Log to screen:
std::cout << FullMsg;
//*/
}
bool cConnection::ConnectToServer(void)
{
m_ServerSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (m_ServerSocket == INVALID_SOCKET)
{
return false;
}
sockaddr_in localhost;
localhost.sin_family = AF_INET;
localhost.sin_port = htons(m_Server.GetConnectPort());
localhost.sin_addr.s_addr = htonl(0x7f000001); // localhost
if (connect(m_ServerSocket, (sockaddr *)&localhost, sizeof(localhost)) != 0)
{
printf("connection to server failed: %d\n", WSAGetLastError());
return false;
}
Log("Connected to SERVER");
return true;
}
bool cConnection::RelayFromServer(void)
{
char Buffer[64 KiB];
int res = recv(m_ServerSocket, Buffer, sizeof(Buffer), 0);
if (res <= 0)
{
Log("Server closed the socket: %d; %d; aborting connection", res, WSAGetLastError());
return false;
}
DataLog(Buffer, res, "Received %d bytes from the SERVER", res);
switch (m_ServerState)
{
case csUnencrypted:
{
return DecodeServersPackets(Buffer, res);
}
case csEncryptedUnderstood:
{
m_ServerDecryptor.ProcessData((byte *)Buffer, (byte *)Buffer, res);
DataLog(Buffer, res, "Decrypted %d bytes from the SERVER", res);
return DecodeServersPackets(Buffer, res);
}
case csEncryptedUnknown:
{
m_ServerDecryptor.ProcessData((byte *)Buffer, (byte *)Buffer, res);
DataLog(Buffer, res, "Decrypted %d bytes from the SERVER", res);
m_ClientEncryptor.ProcessData((byte *)Buffer, (byte *)Buffer, res);
return CLIENTSEND(Buffer, res);
}
}
return true;
}
bool cConnection::RelayFromClient(void)
{
char Buffer[64 KiB];
int res = recv(m_ClientSocket, Buffer, sizeof(Buffer), 0);
if (res <= 0)
{
Log("Client closed the socket: %d; %d; aborting connection", res, WSAGetLastError());
return false;
}
DataLog(Buffer, res, "Received %d bytes from the CLIENT", res);
switch (m_ClientState)
{
case csUnencrypted:
{
return DecodeClientsPackets(Buffer, res);
}
case csEncryptedUnderstood:
{
m_ClientDecryptor.ProcessData((byte *)Buffer, (byte *)Buffer, res);
DataLog(Buffer, res, "Decrypted %d bytes from the CLIENT", res);
return DecodeClientsPackets(Buffer, res);
}
case csEncryptedUnknown:
{
m_ClientDecryptor.ProcessData((byte *)Buffer, (byte *)Buffer, res);
DataLog(Buffer, res, "Decrypted %d bytes from the CLIENT", res);
m_ServerEncryptor.ProcessData((byte *)Buffer, (byte *)Buffer, res);
return SERVERSEND(Buffer, res);
}
}
return true;
}
double cConnection::GetRelativeTime(void)
{
return (double)(clock() - m_BeginTick) / CLOCKS_PER_SEC;
}
bool cConnection::SendData(SOCKET a_Socket, const char * a_Data, int a_Size, const char * a_Peer)
{
DataLog(a_Data, a_Size, "Sending data to %s", a_Peer);
int res = send(a_Socket, a_Data, a_Size, 0);
if (res <= 0)
{
Log("%s closed the socket: %d, %d; aborting connection", a_Peer, res, WSAGetLastError());
return false;
}
return true;
}
bool cConnection::SendData(SOCKET a_Socket, cByteBuffer & a_Data, const char * a_Peer)
{
AString All;
a_Data.ReadAll(All);
a_Data.CommitRead();
return SendData(a_Socket, All.data(), All.size(), a_Peer);
}
bool cConnection::SendEncryptedData(SOCKET a_Socket, Encryptor & a_Encryptor, const char * a_Data, int a_Size, const char * a_Peer)
{
DataLog(a_Data, a_Size, "Encrypting %d bytes to %s", a_Size, a_Peer);
const byte * Data = (const byte *)a_Data;
while (a_Size > 0)
{
byte Buffer[64 KiB];
int NumBytes = (a_Size > sizeof(Buffer)) ? sizeof(Buffer) : a_Size;
a_Encryptor.ProcessData(Buffer, Data, NumBytes);
bool res = SendData(a_Socket, (const char *)Buffer, NumBytes, a_Peer);
if (!res)
{
return false;
}
Data += NumBytes;
a_Size -= NumBytes;
}
return true;
}
bool cConnection::SendEncryptedData(SOCKET a_Socket, Encryptor & a_Encryptor, cByteBuffer & a_Data, const char * a_Peer)
{
AString All;
a_Data.ReadAll(All);
a_Data.CommitRead();
return SendEncryptedData(a_Socket, a_Encryptor, All.data(), All.size(), a_Peer);
}
bool cConnection::DecodeClientsPackets(const char * a_Data, int a_Size)
{
if (!m_ClientBuffer.Write(a_Data, a_Size))
{
Log("Too much queued data for the server, aborting connection");
return false;
}
while (m_ClientBuffer.CanReadBytes(1))
{
Log("Decoding client's packets, there are now %d bytes in the queue", m_ClientBuffer.GetReadableSpace());
unsigned char PacketType;
m_ClientBuffer.ReadByte(PacketType);
switch (PacketType)
{
case PACKET_ANIMATION: HANDLE_CLIENT_READ(HandleClientAnimation); break;
case PACKET_BLOCK_PLACE: HANDLE_CLIENT_READ(HandleClientBlockPlace); break;
case PACKET_CHAT_MESSAGE: HANDLE_CLIENT_READ(HandleClientChatMessage); break;
case PACKET_CLIENT_STATUSES: HANDLE_CLIENT_READ(HandleClientClientStatuses); break;
case PACKET_CREATIVE_INVENTORY_ACTION: HANDLE_CLIENT_READ(HandleClientCreativeInventoryAction); break;
case PACKET_ENCRYPTION_KEY_RESPONSE: HANDLE_CLIENT_READ(HandleClientEncryptionKeyResponse); break;
case PACKET_HANDSHAKE: HANDLE_CLIENT_READ(HandleClientHandshake); break;
case PACKET_KEEPALIVE: HANDLE_CLIENT_READ(HandleClientKeepAlive); break;
case PACKET_LOCALE_AND_VIEW: HANDLE_CLIENT_READ(HandleClientLocaleAndView); break;
case PACKET_PING: HANDLE_CLIENT_READ(HandleClientPing); break;
case PACKET_PLAYER_LOOK: HANDLE_CLIENT_READ(HandleClientPlayerLook); break;
case PACKET_PLAYER_ON_GROUND: HANDLE_CLIENT_READ(HandleClientPlayerOnGround); break;
case PACKET_PLAYER_POSITION: HANDLE_CLIENT_READ(HandleClientPlayerPosition); break;
case PACKET_PLAYER_POSITION_LOOK: HANDLE_CLIENT_READ(HandleClientPlayerPositionLook); break;
case PACKET_SLOT_SELECT: HANDLE_CLIENT_READ(HandleClientSlotSelect); break;
case PACKET_UPDATE_SIGN: HANDLE_CLIENT_READ(HandleClientUpdateSign); break;
case PACKET_USE_ENTITY: HANDLE_CLIENT_READ(HandleClientUseEntity); break;
case PACKET_WINDOW_CLICK: HANDLE_CLIENT_READ(HandleClientWindowClick); break;
case PACKET_WINDOW_CLOSE: HANDLE_CLIENT_READ(HandleClientWindowClose); break;
default:
{
if (m_ClientState == csEncryptedUnderstood)
{
Log("Unknown packet 0x%02x from the client while encrypted; continuing to relay blind only", PacketType);
AString Data;
m_ClientBuffer.ResetRead();
m_ClientBuffer.ReadAll(Data);
DataLog(Data.data(), Data.size(), "Current data in the client packet queue: %d bytes", Data.size());
m_ClientState = csEncryptedUnknown;
m_ClientBuffer.ResetRead();
if (m_ServerState == csUnencrypted)
{
SERVERSEND(m_ClientBuffer);
}
else
{
SERVERENCRYPTSEND(m_ClientBuffer);
}
return true;
}
else
{
Log("Unknown packet 0x%02x from the client while unencrypted; aborting connection", PacketType);
return false;
}
}
} // switch (PacketType)
m_ClientBuffer.CommitRead();
} // while (CanReadBytes(1))
return true;
}
bool cConnection::DecodeServersPackets(const char * a_Data, int a_Size)
{
if (!m_ServerBuffer.Write(a_Data, a_Size))
{
Log("Too much queued data for the client, aborting connection");
return false;
}
if (
(m_ServerState == csEncryptedUnderstood) &&
(m_ClientState == csUnencrypted)
)
{
// Client hasn't finished encryption handshake yet, don't send them any data yet
}
while (m_ServerBuffer.CanReadBytes(1))
{
Log("Decoding server's packets, there are now %d bytes in the queue", m_ServerBuffer.GetReadableSpace());
unsigned char PacketType;
m_ServerBuffer.ReadByte(PacketType);
switch (PacketType)
{
case PACKET_BLOCK_CHANGE: HANDLE_SERVER_READ(HandleServerBlockChange); break;
case PACKET_CHANGE_GAME_STATE: HANDLE_SERVER_READ(HandleServerChangeGameState); break;
case PACKET_CHAT_MESSAGE: HANDLE_SERVER_READ(HandleServerChatMessage); break;
case PACKET_COMPASS: HANDLE_SERVER_READ(HandleServerCompass); break;
case PACKET_ENCRYPTION_KEY_REQUEST: HANDLE_SERVER_READ(HandleServerEncryptionKeyRequest); break;
case PACKET_ENCRYPTION_KEY_RESPONSE: HANDLE_SERVER_READ(HandleServerEncryptionKeyResponse); break;
case PACKET_ENTITY_EQUIPMENT: HANDLE_SERVER_READ(HandleServerEntityEquipment); break;
case PACKET_KEEPALIVE: HANDLE_SERVER_READ(HandleServerKeepAlive); break;
case PACKET_KICK: HANDLE_SERVER_READ(HandleServerKick); break;
case PACKET_LOGIN: HANDLE_SERVER_READ(HandleServerLogin); break;
case PACKET_MAP_CHUNK: HANDLE_SERVER_READ(HandleServerMapChunk); break;
case PACKET_MULTI_BLOCK_CHANGE: HANDLE_SERVER_READ(HandleServerMultiBlockChange); break;
case PACKET_PLAYER_ABILITIES: HANDLE_SERVER_READ(HandleServerPlayerAbilities); break;
case PACKET_PLAYER_LIST_ITEM: HANDLE_SERVER_READ(HandleServerPlayerListItem); break;
case PACKET_PLAYER_POSITION_LOOK: HANDLE_SERVER_READ(HandleServerPlayerPositionLook); break;
case PACKET_SET_SLOT: HANDLE_SERVER_READ(HandleServerSetSlot); break;
case PACKET_TIME_UPDATE: HANDLE_SERVER_READ(HandleServerTimeUpdate); break;
case PACKET_UPDATE_HEALTH: HANDLE_SERVER_READ(HandleServerUpdateHealth); break;
case PACKET_UPDATE_SIGN: HANDLE_SERVER_READ(HandleServerUpdateSign); break;
case PACKET_WINDOW_CONTENTS: HANDLE_SERVER_READ(HandleServerWindowContents); break;
default:
{
if (m_ServerState == csEncryptedUnderstood)
{
Log("Unknown packet 0x%02x from the server while encrypted; continuing to relay blind only", PacketType);
AString Data;
m_ServerBuffer.ResetRead();
m_ServerBuffer.ReadAll(Data);
DataLog(Data.data(), Data.size(), "Current data in the server packet queue: %d bytes", Data.size());
m_ServerState = csEncryptedUnknown;
m_ServerBuffer.ResetRead();
if (m_ClientState == csUnencrypted)
{
CLIENTSEND(m_ServerBuffer);
}
else
{
CLIENTENCRYPTSEND(m_ServerBuffer);
}
return true;
}
else
{
Log("Unknown packet 0x%02x from the server while unencrypted; aborting connection", PacketType);
return false;
}
}
} // switch (PacketType)
m_ServerBuffer.CommitRead();
} // while (CanReadBytes(1))
return true;
}
bool cConnection::HandleClientAnimation(void)
{
HANDLE_CLIENT_PACKET_READ(ReadBEInt, int, EntityID);
HANDLE_CLIENT_PACKET_READ(ReadChar, char, Animation);
Log("Received a PACKET_ANIMATION from the client:");
Log(" EntityID: %d", EntityID);
Log(" Animation: %d", Animation);
COPY_TO_SERVER();
return true;
}
bool cConnection::HandleClientBlockPlace(void)
{
HANDLE_CLIENT_PACKET_READ(ReadBEInt, int, BlockX);
HANDLE_CLIENT_PACKET_READ(ReadByte, Byte, BlockY);
HANDLE_CLIENT_PACKET_READ(ReadBEInt, int, BlockZ);
HANDLE_CLIENT_PACKET_READ(ReadChar, char, Face);
AString Desc;
if (!ParseSlot(m_ClientBuffer, Desc))
{
return false;
}
HANDLE_CLIENT_PACKET_READ(ReadChar, char, CursorX);
HANDLE_CLIENT_PACKET_READ(ReadChar, char, CursorY);
HANDLE_CLIENT_PACKET_READ(ReadChar, char, CursorZ);
Log("Received a PACKET_BLOCK_PLACE from the client:");
Log(" Block = {%d, %d, %d}", BlockX, BlockY, BlockZ);
Log(" Face = %d", Face);
Log(" Item = %s", Desc.c_str());
Log(" Cursor = <%d, %d, %d>", CursorX, CursorY, CursorZ);
COPY_TO_SERVER();
return true;
}
bool cConnection::HandleClientChatMessage(void)
{
HANDLE_CLIENT_PACKET_READ(ReadBEUTF16String16, AString, Message);
Log("Received a PACKET_CHAT_MESSAGE from the client:");
Log(" Message = \"%s\"", Message.c_str());
COPY_TO_SERVER();
return true;
}
bool cConnection::HandleClientClientStatuses(void)
{
HANDLE_CLIENT_PACKET_READ(ReadChar, char, Statuses);
Log("Received a PACKET_CLIENT_STATUSES from the CLIENT:");
Log(" Statuses = %d", Statuses);
COPY_TO_SERVER();
return true;
}
bool cConnection::HandleClientCreativeInventoryAction(void)
{
HANDLE_CLIENT_PACKET_READ(ReadBEShort, short, SlotNum);
AString Item;
if (!ParseSlot(m_ClientBuffer, Item))
{
return false;
}
Log("Received a PACKET_CREATIVE_INVENTORY_ACTION from the client:");
Log(" SlotNum = %d", SlotNum);
Log(" Item = %s", Item.c_str());
COPY_TO_SERVER();
return true;
}
bool cConnection::HandleClientEncryptionKeyResponse(void)
{
HANDLE_CLIENT_PACKET_READ(ReadBEShort, short, EncKeyLength);
AString EncKey;
if (!m_ClientBuffer.ReadString(EncKey, EncKeyLength))
{
return true;
}
HANDLE_CLIENT_PACKET_READ(ReadBEShort, short, EncNonceLength);
AString EncNonce;
if (!m_ClientBuffer.ReadString(EncNonce, EncNonceLength))
{
return true;
}
if ((EncKeyLength > MAX_ENC_LEN) || (EncNonceLength > MAX_ENC_LEN))
{
Log("Client: Too long encryption params");
return true;
}
StartClientEncryption(EncKey, EncNonce);
return true;
}
bool cConnection::HandleClientHandshake(void)
{
// Read the packet from the client:
HANDLE_CLIENT_PACKET_READ(ReadByte, Byte, ProtocolVersion);
HANDLE_CLIENT_PACKET_READ(ReadBEUTF16String16, AString, Username);
HANDLE_CLIENT_PACKET_READ(ReadBEUTF16String16, AString, ServerHost);
HANDLE_CLIENT_PACKET_READ(ReadBEInt, int, ServerPort);
m_ClientBuffer.CommitRead();
// Send the same packet to the server, but with our port:
cByteBuffer ToServer(512);
ToServer.WriteByte (PACKET_HANDSHAKE);
ToServer.WriteByte (ProtocolVersion);
ToServer.WriteBEUTF16String16(Username);
ToServer.WriteBEUTF16String16(ServerHost);
ToServer.WriteBEInt (m_Server.GetConnectPort());
SERVERSEND(ToServer);
return true;
}
bool cConnection::HandleClientKeepAlive(void)
{
HANDLE_CLIENT_PACKET_READ(ReadBEInt, int, ID);
Log("Received a PACKET_KEEPALIVE from the client");
COPY_TO_SERVER();
return true;
}
bool cConnection::HandleClientLocaleAndView(void)
{
HANDLE_CLIENT_PACKET_READ(ReadBEUTF16String16, AString, Locale);
HANDLE_CLIENT_PACKET_READ(ReadChar, char, ViewDistance);
HANDLE_CLIENT_PACKET_READ(ReadChar, char, ChatFlags);
HANDLE_CLIENT_PACKET_READ(ReadChar, char, Difficulty);
Log("Received a PACKET_LOCALE_AND_VIEW from the client");
COPY_TO_SERVER();
return true;
}
bool cConnection::HandleClientPing(void)
{
Log("Received a PACKET_PING from the client");
m_ClientBuffer.ResetRead();
SERVERSEND(m_ClientBuffer);
return true;
}
bool cConnection::HandleClientPlayerLook(void)
{
HANDLE_CLIENT_PACKET_READ(ReadBEFloat, float, Yaw);
HANDLE_CLIENT_PACKET_READ(ReadBEFloat, float, Pitch);
HANDLE_CLIENT_PACKET_READ(ReadChar, char, OnGround);
Log("Received a PACKET_PLAYER_LOOK from the client");
COPY_TO_SERVER();
return true;
}
bool cConnection::HandleClientPlayerOnGround(void)
{
HANDLE_CLIENT_PACKET_READ(ReadChar, char, OnGround);
Log("Received a PACKET_PLAYER_ON_GROUND from the client");
COPY_TO_SERVER();
return true;
}
bool cConnection::HandleClientPlayerPosition(void)
{
HANDLE_CLIENT_PACKET_READ(ReadBEDouble, double, PosX);
HANDLE_CLIENT_PACKET_READ(ReadBEDouble, double, Stance);
HANDLE_CLIENT_PACKET_READ(ReadBEDouble, double, PosY);
HANDLE_CLIENT_PACKET_READ(ReadBEDouble, double, PosZ);
HANDLE_CLIENT_PACKET_READ(ReadChar, char, IsOnGround);
Log("Received a PACKET_PLAYER_POSITION from the client");
// TODO: list packet contents
COPY_TO_SERVER();
return true;
}
bool cConnection::HandleClientPlayerPositionLook(void)
{
HANDLE_CLIENT_PACKET_READ(ReadBEDouble, double, PosX);
HANDLE_CLIENT_PACKET_READ(ReadBEDouble, double, Stance);
HANDLE_CLIENT_PACKET_READ(ReadBEDouble, double, PosY);
HANDLE_CLIENT_PACKET_READ(ReadBEDouble, double, PosZ);
HANDLE_CLIENT_PACKET_READ(ReadBEFloat, float, Yaw);
HANDLE_CLIENT_PACKET_READ(ReadBEFloat, float, Pitch);
HANDLE_CLIENT_PACKET_READ(ReadChar, char, IsOnGround);
Log("Received a PACKET_PLAYER_POSITION_LOOK from the client");
// TODO: list packet contents
COPY_TO_SERVER();
return true;
}
bool cConnection::HandleClientSlotSelect(void)
{
HANDLE_CLIENT_PACKET_READ(ReadBEShort, short, SlotNum);
Log("Received a PACKET_SLOT_SELECT from the client");
Log(" SlotNum = %d", SlotNum);
COPY_TO_SERVER();
return true;
}
bool cConnection::HandleClientUpdateSign(void)
{
HANDLE_CLIENT_PACKET_READ(ReadBEInt, int, BlockX);
HANDLE_CLIENT_PACKET_READ(ReadBEShort, short, BlockY);
HANDLE_CLIENT_PACKET_READ(ReadBEInt, int, BlockZ);
HANDLE_CLIENT_PACKET_READ(ReadBEUTF16String16, AString, Line1);
HANDLE_CLIENT_PACKET_READ(ReadBEUTF16String16, AString, Line2);
HANDLE_CLIENT_PACKET_READ(ReadBEUTF16String16, AString, Line3);
HANDLE_CLIENT_PACKET_READ(ReadBEUTF16String16, AString, Line4);
Log("Received a PACKET_UPDATE_SIGN from the client:");
Log(" Block = {%d, %d, %d}", BlockX, BlockY, BlockZ);
Log(" Lines = \"%s\", \"%s\", \"%s\", \"%s\"", Line1.c_str(), Line2.c_str(), Line3.c_str(), Line4.c_str());
COPY_TO_SERVER();
return true;
}
bool cConnection::HandleClientUseEntity(void)
{
HANDLE_CLIENT_PACKET_READ(ReadBEInt, int, PlayerID);
HANDLE_CLIENT_PACKET_READ(ReadBEInt, int, EntityID);
HANDLE_CLIENT_PACKET_READ(ReadChar, char, MouseButton);
Log("Received a PACKET_USE_ENTITY from the client:");
Log(" PlayerID = %d", PlayerID);
Log(" EntityID = %d", EntityID);
Log(" MouseButton = %d", MouseButton);
COPY_TO_SERVER();
return true;
}
bool cConnection::HandleClientWindowClick(void)
{
HANDLE_CLIENT_PACKET_READ(ReadChar, char, WindowID);
HANDLE_CLIENT_PACKET_READ(ReadBEShort, short, SlotNum);
HANDLE_CLIENT_PACKET_READ(ReadChar, char, IsRightClick);
HANDLE_CLIENT_PACKET_READ(ReadBEShort, short, TransactionID);
HANDLE_CLIENT_PACKET_READ(ReadChar, char, IsShiftClick);
AString Item;
if (!ParseSlot(m_ClientBuffer, Item))
{
return false;
}
Log("Received a PACKET_WINDOW_CLICK from the client");
Log(" WindowID = %d", WindowID);
Log(" SlotNum = %d", SlotNum);
Log(" IsRclk = %d, IsShift = %d", IsRightClick, IsShiftClick);
Log(" TransactionID = 0x%x", TransactionID);
Log(" ClickedItem = %s", Item.c_str());
COPY_TO_SERVER();
return true;
}
bool cConnection::HandleClientWindowClose(void)
{
HANDLE_CLIENT_PACKET_READ(ReadChar, char, WindowID);
Log("Received a PACKET_WINDOW_CLOSE from the client:");
Log(" WindowID = %d", WindowID);
COPY_TO_SERVER();
return true;
}
bool cConnection::HandleServerBlockChange(void)
{
HANDLE_SERVER_PACKET_READ(ReadBEInt, int, BlockX);
HANDLE_SERVER_PACKET_READ(ReadByte, Byte, BlockY);
HANDLE_SERVER_PACKET_READ(ReadBEInt, int, BlockZ);
HANDLE_SERVER_PACKET_READ(ReadBEShort, short, BlockType);
HANDLE_SERVER_PACKET_READ(ReadChar, char, BlockMeta);
Log("Received a PACKET_BLOCK_CHANGE from the server");
COPY_TO_CLIENT();
return true;
}
bool cConnection::HandleServerChangeGameState(void)
{
HANDLE_SERVER_PACKET_READ(ReadChar, char, Reason);
HANDLE_SERVER_PACKET_READ(ReadChar, char, Data);
Log("Received a PACKET_CHANGE_GAME_STATE from the server:");
Log(" Reason = %d", Reason);
Log(" Data = %d", Data);
COPY_TO_CLIENT();
return true;
}
bool cConnection::HandleServerChatMessage(void)
{
HANDLE_SERVER_PACKET_READ(ReadBEUTF16String16, AString, Message);
Log("Received a PACKET_CHAT_MESSAGE from the server:");
Log(" Message = \"%s\"", Message.c_str());
COPY_TO_CLIENT();
return true;
}
bool cConnection::HandleServerCompass(void)
{
HANDLE_SERVER_PACKET_READ(ReadBEInt, int, SpawnX);
HANDLE_SERVER_PACKET_READ(ReadBEInt, int, SpawnY);
HANDLE_SERVER_PACKET_READ(ReadBEInt, int, SpawnZ);
Log("Received PACKET_COMPASS from the server:");
Log(" Spawn = {%d, %d, %d}", SpawnX, SpawnY, SpawnZ);
COPY_TO_CLIENT();
return true;
}
bool cConnection::HandleServerEncryptionKeyRequest(void)
{
// Read the packet from the server:
HANDLE_SERVER_PACKET_READ(ReadBEUTF16String16, AString, ServerID);
HANDLE_SERVER_PACKET_READ(ReadBEShort, short, PublicKeyLength);
AString PublicKey;
if (!m_ServerBuffer.ReadString(PublicKey, PublicKeyLength))
{
return false;
}
HANDLE_SERVER_PACKET_READ(ReadBEShort, short, NonceLength);
AString Nonce;
if (!m_ServerBuffer.ReadString(Nonce, NonceLength))
{
return false;
}
Log("Got PACKET_ENCRYPTION_KEY_REQUEST from the SERVER:");
Log(" ServerID = %s", ServerID.c_str());
// Reply to the server:
SendEncryptionKeyResponse(PublicKey, Nonce);
// Send a 0xFD Encryption Key Request http://wiki.vg/Protocol#0xFD to the client, using our own key:
Log("Sending PACKET_ENCRYPTION_KEY_REQUEST to the CLIENT");
AString key;
StringSink sink(key); // GCC won't allow inline instantiation in the following line, damned temporary refs
m_Server.GetPublicKey().Save(sink);
cByteBuffer ToClient(512);
ToClient.WriteByte (PACKET_ENCRYPTION_KEY_REQUEST);
ToClient.WriteBEUTF16String16(ServerID);
ToClient.WriteBEShort ((short)key.size());
ToClient.WriteBuf (key.data(), key.size());
ToClient.WriteBEShort (4);
ToClient.WriteBEInt (m_Nonce); // Using 'this' as the cryptographic nonce, so that we don't have to generate one each time :)
CLIENTSEND(ToClient);
return true;
}
bool cConnection::HandleServerEntityEquipment(void)
{
HANDLE_SERVER_PACKET_READ(ReadBEInt, int, EntityID);
HANDLE_SERVER_PACKET_READ(ReadBEShort, short, SlotNum);
AString Item;
if (!ParseSlot(m_ServerBuffer, Item))
{
return false;
}
Log("Received a PACKET_ENTITY_EQUIPMENT from the server:");
Log(" EntityID = %d", EntityID);
Log(" SlotNum = %d", SlotNum);
Log(" Item = %s", Item.c_str());
COPY_TO_CLIENT();
return true;
}
bool cConnection::HandleServerKeepAlive(void)
{
HANDLE_SERVER_PACKET_READ(ReadBEInt, int, PingID);
Log("Received a PACKET_KEEP_ALIVE from the server:");
Log(" ID = %d", PingID);
COPY_TO_CLIENT()
return true;
}
bool cConnection::HandleServerEncryptionKeyResponse(void)
{
HANDLE_SERVER_PACKET_READ(ReadBEInt, int, Lengths);
if (Lengths != 0)
{
Log("Lengths are not zero!");
return true;
}
Log("Server communication is now encrypted");
m_ServerState = csEncryptedUnderstood;
return true;
}
bool cConnection::HandleServerKick(void)
{
HANDLE_SERVER_PACKET_READ(ReadBEUTF16String16, AString, Reason);
Log("Received PACKET_KICK from the SERVER:");
Log(" Reason = \"%s\"", Reason.c_str());
COPY_TO_CLIENT();
return true;
}
bool cConnection::HandleServerLogin(void)
{
HANDLE_SERVER_PACKET_READ(ReadBEInt, int, EntityID);
HANDLE_SERVER_PACKET_READ(ReadBEUTF16String16, AString, LevelType);
HANDLE_SERVER_PACKET_READ(ReadChar, char, GameMode);
HANDLE_SERVER_PACKET_READ(ReadChar, char, Dimension);
HANDLE_SERVER_PACKET_READ(ReadChar, char, Difficulty);
HANDLE_SERVER_PACKET_READ(ReadChar, char, Unused);
HANDLE_SERVER_PACKET_READ(ReadChar, char, MaxPlayers);
Log("Received a PACKET_LOGIN from the server:");
Log(" EntityID = %d", EntityID);
Log(" LevelType = \"%s\"", LevelType.c_str());
Log(" GameMode = %d", GameMode);
Log(" Dimension = %d", Dimension);
Log(" Difficulty = %d", Difficulty);
Log(" Unused = %d", Unused);
Log(" MaxPlayers = %d", MaxPlayers);
COPY_TO_CLIENT();
return true;
}
bool cConnection::HandleServerMapChunk(void)
{
HANDLE_SERVER_PACKET_READ(ReadBEInt, int, ChunkX);
HANDLE_SERVER_PACKET_READ(ReadBEInt, int, ChunkZ);
HANDLE_SERVER_PACKET_READ(ReadChar, char, IsContiguous);
HANDLE_SERVER_PACKET_READ(ReadBEShort, short, PrimaryBitmap);
HANDLE_SERVER_PACKET_READ(ReadBEShort, short, AdditionalBitmap);
HANDLE_SERVER_PACKET_READ(ReadBEInt, int, CompressedSize);
AString CompressedData;
if (!m_ServerBuffer.ReadString(CompressedData, CompressedSize))
{
return false;
}
Log("Received a PACKET_MAP_CHUNK from the server:");
Log(" ChunkPos = [%d, %d]", ChunkX, ChunkZ);
Log(" Compressed size = %d (0x%x)", CompressedSize, CompressedSize);
// TODO: Save the compressed data into a file for later analysis
COPY_TO_CLIENT()
return true;
}
bool cConnection::HandleServerMultiBlockChange(void)
{
HANDLE_SERVER_PACKET_READ(ReadBEInt, int, ChunkX);
HANDLE_SERVER_PACKET_READ(ReadBEInt, int, ChunkZ);
HANDLE_SERVER_PACKET_READ(ReadBEShort, short, NumBlocks);
HANDLE_SERVER_PACKET_READ(ReadBEInt, int, DataSize);
AString BlockChangeData;
if (!m_ServerBuffer.ReadString(BlockChangeData, DataSize))
{
return false;
}
Log("Received a PACKET_MULTI_BLOCK_CHANGE packet from the server:");
Log(" Chunk = [%d, %d]", ChunkX, ChunkZ);
Log(" NumBlocks = %d", NumBlocks);
COPY_TO_CLIENT();
return true;
}
bool cConnection::HandleServerPlayerAbilities(void)
{
HANDLE_SERVER_PACKET_READ(ReadChar, char, Flags);
HANDLE_SERVER_PACKET_READ(ReadChar, char, FlyingSpeed);
HANDLE_SERVER_PACKET_READ(ReadChar, char, WalkingSpeed);
Log("Received a PACKET_PLAYER_ABILITIES from the server:");
Log(" Flags = 0x%x", Flags);
Log(" FlyingSpeed = %d", FlyingSpeed);
Log(" WalkingSpeed = %d", WalkingSpeed);
COPY_TO_CLIENT();
return true;
}
bool cConnection::HandleServerPlayerListItem(void)
{
HANDLE_SERVER_PACKET_READ(ReadBEUTF16String16, AString, PlayerName);
HANDLE_SERVER_PACKET_READ(ReadChar, char, IsOnline);
HANDLE_SERVER_PACKET_READ(ReadBEShort, short, Ping);
Log("Received a PACKET_PLAYERLIST_ITEM from the server:");
Log(" PlayerName = \"%s\"", PlayerName.c_str());
Log(" Ping = %d", Ping);
COPY_TO_CLIENT();
return true;
}
bool cConnection::HandleServerPlayerPositionLook(void)
{
HANDLE_SERVER_PACKET_READ(ReadBEDouble, double, PosX);
HANDLE_SERVER_PACKET_READ(ReadBEDouble, double, Stance);
HANDLE_SERVER_PACKET_READ(ReadBEDouble, double, PosY);
HANDLE_SERVER_PACKET_READ(ReadBEDouble, double, PosZ);
HANDLE_SERVER_PACKET_READ(ReadBEFloat, float, Yaw);
HANDLE_SERVER_PACKET_READ(ReadBEFloat, float, Pitch);
HANDLE_SERVER_PACKET_READ(ReadChar, char, IsOnGround);
Log("Received a PACKET_PLAYER_POSITION_LOOK from the server");
// TODO: list packet contents
COPY_TO_CLIENT();
return true;
}
bool cConnection::HandleServerSetSlot(void)
{
HANDLE_SERVER_PACKET_READ(ReadChar, char, WindowID);
HANDLE_SERVER_PACKET_READ(ReadBEShort, short, SlotNum);
AString Item;
if (!ParseSlot(m_ServerBuffer, Item))
{
return false;
}
Log("Received a PACKET_SET_SLOT from the server:");
Log(" WindowID = %d", WindowID);
Log(" SlotNum = %d", SlotNum);
Log(" Item = %s", Item.c_str());
COPY_TO_CLIENT();
return true;
}
bool cConnection::HandleServerTimeUpdate(void)
{
HANDLE_SERVER_PACKET_READ(ReadBEInt64, Int64, Time);
Log("Received a PACKET_TIME_UPDATE from the server");
COPY_TO_CLIENT();
return true;
}
bool cConnection::HandleServerUpdateHealth(void)
{
HANDLE_SERVER_PACKET_READ(ReadBEShort, short, Health);
HANDLE_SERVER_PACKET_READ(ReadBEShort, short, Food);
HANDLE_SERVER_PACKET_READ(ReadBEFloat, float, Saturation);
Log("Received a PACKET_UPDATE_HEALTH from the server");
COPY_TO_CLIENT();
return true;
}
bool cConnection::HandleServerUpdateSign(void)
{
HANDLE_SERVER_PACKET_READ(ReadBEInt, int, BlockX);
HANDLE_SERVER_PACKET_READ(ReadBEShort, short, BlockY);
HANDLE_SERVER_PACKET_READ(ReadBEInt, int, BlockZ);
HANDLE_SERVER_PACKET_READ(ReadBEUTF16String16, AString, Line1);
HANDLE_SERVER_PACKET_READ(ReadBEUTF16String16, AString, Line2);
HANDLE_SERVER_PACKET_READ(ReadBEUTF16String16, AString, Line3);
HANDLE_SERVER_PACKET_READ(ReadBEUTF16String16, AString, Line4);
Log("Received a PACKET_UPDATE_SIGN from the server:");
Log(" Block = {%d, %d, %d}", BlockX, BlockY, BlockZ);
Log(" Lines = \"%s\", \"%s\", \"%s\", \"%s\"", Line1.c_str(), Line2.c_str(), Line3.c_str(), Line4.c_str());
COPY_TO_CLIENT();
return true;
}
bool cConnection::HandleServerWindowClose(void)
{
HANDLE_SERVER_PACKET_READ(ReadChar, char, WindowID);
Log("Received a PACKET_WINDOW_CLOSE from the server:");
Log(" WindowID = %d", WindowID);
COPY_TO_CLIENT();
return true;
}
bool cConnection::HandleServerWindowContents(void)
{
HANDLE_SERVER_PACKET_READ(ReadChar, char, WindowID);
HANDLE_SERVER_PACKET_READ(ReadBEShort, short, NumSlots);
AStringVector Items;
for (short i = 0; i < NumSlots; i++)
{
AString Item;
if (!ParseSlot(m_ServerBuffer, Item))
{
return false;
}
Items.push_back(Item);
}
Log("Received a PACKET_WINDOW_CONTENTS from the server:");
Log(" WindowID = %d", WindowID);
Log(" NumSlots = %d", NumSlots);
// TODO: list items
COPY_TO_CLIENT();
return true;
}
bool cConnection::ParseSlot(cByteBuffer & a_Buffer, AString & a_ItemDesc)
{
short ItemType;
if (!a_Buffer.ReadBEShort(ItemType))
{
return false;
}
if (ItemType <= 0)
{
a_ItemDesc = "<empty>";
return true;
}
if (!a_Buffer.CanReadBytes(5))
{
return false;
}
char ItemCount;
short ItemDamage;
short MetadataLength;
a_Buffer.ReadChar(ItemCount);
a_Buffer.ReadBEShort(ItemDamage);
a_Buffer.ReadBEShort(MetadataLength);
Printf(a_ItemDesc, "%d:%d * %d", ItemType, ItemDamage, ItemCount);
if (MetadataLength <= 0)
{
return true;
}
AppendPrintf(a_ItemDesc, " (%d bytes of meta)", MetadataLength);
if (!a_Buffer.SkipRead(MetadataLength))
{
return false;
}
return true;
}
void cConnection::SendEncryptionKeyResponse(const AString & a_ServerPublicKey, const AString & a_Nonce)
{
// Generate the shared secret and encrypt using the server's public key
byte SharedSecret[16];
byte EncryptedSecret[128];
memset(SharedSecret, 0, sizeof(SharedSecret)); // Use all zeroes for the initial secret
RSA::PublicKey pk;
CryptoPP::StringSource src(a_ServerPublicKey, true);
ByteQueue bq;
src.TransferTo(bq);
bq.MessageEnd();
pk.Load(bq);
RSAES<PKCS1v15>::Encryptor rsaEncryptor(pk);
RandomPool rng;
time_t CurTime = time(NULL);
rng.Put((const byte *)&CurTime, sizeof(CurTime));
int EncryptedLength = rsaEncryptor.FixedCiphertextLength();
ASSERT(EncryptedLength <= sizeof(EncryptedSecret));
rsaEncryptor.Encrypt(rng, SharedSecret, sizeof(SharedSecret), EncryptedSecret);
m_ServerEncryptor.SetKey(SharedSecret, 16, MakeParameters(Name::IV(), ConstByteArrayParameter(SharedSecret, 16))(Name::FeedbackSize(), 1));
m_ServerDecryptor.SetKey(SharedSecret, 16, MakeParameters(Name::IV(), ConstByteArrayParameter(SharedSecret, 16))(Name::FeedbackSize(), 1));
// Encrypt the nonce:
byte EncryptedNonce[128];
rsaEncryptor.Encrypt(rng, (const byte *)(a_Nonce.data()), a_Nonce.size(), EncryptedNonce);
// Send the packet to the server:
Log("Sending PACKET_ENCRYPTION_KEY_RESPONSE to the SERVER");
cByteBuffer ToServer(1024);
ToServer.WriteByte(PACKET_ENCRYPTION_KEY_RESPONSE);
ToServer.WriteBEShort(EncryptedLength);
ToServer.WriteBuf(EncryptedSecret, EncryptedLength);
ToServer.WriteBEShort(EncryptedLength);
ToServer.WriteBuf(EncryptedNonce, EncryptedLength);
SERVERSEND(ToServer);
}
void cConnection::StartClientEncryption(const AString & a_EncKey, const AString & a_EncNonce)
{
// Decrypt EncNonce using privkey
RSAES<PKCS1v15>::Decryptor rsaDecryptor(m_Server.GetPrivateKey());
time_t CurTime = time(NULL);
RandomPool rng;
rng.Put((const byte *)&CurTime, sizeof(CurTime));
byte DecryptedNonce[MAX_ENC_LEN];
DecodingResult res = rsaDecryptor.Decrypt(rng, (const byte *)a_EncNonce.data(), a_EncNonce.size(), DecryptedNonce);
if (!res.isValidCoding || (res.messageLength != 4))
{
Log("Client: Bad nonce length");
return;
}
if (ntohl(*((int *)DecryptedNonce)) != m_Nonce)
{
Log("Bad nonce value");
return;
}
// Decrypt the symmetric encryption key using privkey:
byte SharedSecret[MAX_ENC_LEN];
res = rsaDecryptor.Decrypt(rng, (const byte *)a_EncKey.data(), a_EncKey.size(), SharedSecret);
if (!res.isValidCoding || (res.messageLength != 16))
{
Log("Bad key length");
return;
}
// Send encryption key response:
cByteBuffer ToClient(6);
ToClient.WriteByte((char)0xfc);
ToClient.WriteBEShort(0);
ToClient.WriteBEShort(0);
CLIENTSEND(ToClient);
// Start the encryption:
m_ClientEncryptor.SetKey(SharedSecret, 16, MakeParameters(Name::IV(), ConstByteArrayParameter(SharedSecret, 16))(Name::FeedbackSize(), 1));
m_ClientDecryptor.SetKey(SharedSecret, 16, MakeParameters(Name::IV(), ConstByteArrayParameter(SharedSecret, 16))(Name::FeedbackSize(), 1));
Log("Client connection is now encrypted");
m_ClientState = csEncryptedUnderstood;
// Handle all postponed server data
DecodeServersPackets(NULL, 0);
}
