source-engine/engine/sv_uploaddata.cpp

//========= Copyright Valve Corporation, All rights reserved. ============//
//
// Purpose: 
//
// $NoKeywords: $
//
//=============================================================================//


#if defined(_WIN32) && !defined(_X360)
#include <winsock.h>
#elif POSIX
#include <sys/socket.h>
#include <netinet/in.h>
#elif !defined(_X360)
#error "define socket.h"
#endif
#include "host.h"
#include "blockingudpsocket.h"
#include "cserserverprotocol_engine.h"
#include "KeyValues.h"
#include "bitbuf.h"
#include "mathlib/IceKey.H"
#include "net.h"

// memdbgon must be the last include file in a .cpp file!!!
#include "tier0/memdbgon.h"

static int CountFields( KeyValues *fields )
{
	int c = 0;
	KeyValues *kv = fields->GetFirstSubKey();
	while ( kv )
	{
		c++;
		kv = kv->GetNextKey();
	}
	return c;
}

//-----------------------------------------------------------------------------
// Purpose: encrypts an 8-byte sequence
//-----------------------------------------------------------------------------
static inline void Encrypt8ByteSequence( IceKey& cipher, const unsigned char *plainText, unsigned char *cipherText)
{
	cipher.encrypt(plainText, cipherText);
}

//-----------------------------------------------------------------------------
// Purpose: 
//-----------------------------------------------------------------------------
static void EncryptBuffer( IceKey& cipher, unsigned char *bufData, uint bufferSize)
{
	unsigned char *cipherText = bufData;
	unsigned char *plainText = bufData;
	uint bytesEncrypted = 0;

	while (bytesEncrypted < bufferSize)
	{
		// encrypt 8 byte section
		Encrypt8ByteSequence( cipher, plainText, cipherText);
		bytesEncrypted += 8;
		cipherText += 8;
		plainText += 8;
	}
}

static void BuildUploadDataMessage( bf_write& buf, char const *tablename, KeyValues *fields )
{
	bf_write	encrypted;
	ALIGN4 byte		encrypted_data[ 2048 ] ALIGN4_POST;

	buf.WriteByte( C2M_UPLOADDATA );
	buf.WriteByte( '\n' );
	buf.WriteByte( C2M_UPLOADDATA_PROTOCOL_VERSION );

	// encryption object
	IceKey cipher(1); /* medium encryption level */
	unsigned char ucEncryptionKey[8] = { 54, 175, 165, 5, 76, 251, 29, 113 };
	cipher.set( ucEncryptionKey );

	encrypted.StartWriting( encrypted_data, sizeof( encrypted_data ) );

	byte corruption_identifier = 0x01;

	encrypted.WriteByte( corruption_identifier );

	// Data version protocol
	encrypted.WriteByte( C2M_UPLOADDATA_DATA_VERSION );

	encrypted.WriteString( tablename ); 

	int fieldCount = CountFields( fields );

	if ( fieldCount > 255 )
	{
		Host_Error( "Too many fields in uploaddata (%i max = 255)\n", fieldCount );
	}

	encrypted.WriteByte( (byte)fieldCount );

	KeyValues *kv = fields->GetFirstSubKey();
	while ( kv )
	{
		encrypted.WriteString( kv->GetName() );
		encrypted.WriteString( kv->GetString() );

		kv = kv->GetNextKey();
	}

	// Round to multiple of 8 for encrypted
	while ( encrypted.GetNumBytesWritten() % 8 )
	{
		encrypted.WriteByte( 0 );
	}

	EncryptBuffer( cipher, (unsigned char *)encrypted.GetData(), encrypted.GetNumBytesWritten() );

	buf.WriteShort( (int)encrypted.GetNumBytesWritten() );
	buf.WriteBytes( (unsigned char *)encrypted.GetData(), encrypted.GetNumBytesWritten() );
}

//-----------------------------------------------------------------------------
// Purpose: 
// Input  : *cserIP - 
//			*tablename - 
//			*fields - 
// Output : Returns true on success, false on failure.
//-----------------------------------------------------------------------------
bool UploadData( char const *cserIP, char const *tablename, KeyValues *fields )
{
#ifndef _XBOX
	bf_write	buf;
	ALIGN4 byte		data[ 2048 ] ALIGN4_POST;
		
	buf.StartWriting( data, sizeof( data ) );

	BuildUploadDataMessage( buf, tablename, fields );

	netadr_t cseradr;

	if ( NET_StringToAdr( cserIP, &cseradr ) )
	{
		CBlockingUDPSocket *socket = new CBlockingUDPSocket();
		if ( socket )
		{
			struct sockaddr_in sa;
			cseradr.ToSockadr( (struct sockaddr *)&sa );

			// Don't bother waiting for response here
			socket->SendSocketMessage( sa, (const byte *)buf.GetData(), buf.GetNumBytesWritten() );
			delete socket;

			return true;
		}
	}

	return false;
#else
	return true;
#endif
}

/*
CON_COMMAND( datatest, "" )
{
	KeyValues *kv = new KeyValues( "data" );
	kv->SetString( "IDHash", "abcdefg" );
	kv->SetString( "Time", "DATETIME" );
	kv->SetString( "DXDeviceID", "1001" );
	kv->SetString( "DXVendorID", "1001" );
	kv->SetString( "Framerate", "999" );
	kv->SetString( "BuildNumber", va( "%i", build_number() ) );

	bool bret = UploadData( "127.0.0.1:27013", "benchmark", kv );

	kv->deleteThis();
}
*/