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/**************************************************************************/
/* */
/* Copyright (c) 2001, 2007 NoMachine, http://www.nomachine.com/. */
/* */
/* NXCOMP, NX protocol compression and NX extensions to this software */
/* are copyright of NoMachine. Redistribution and use of the present */
/* software is allowed according to terms specified in the file LICENSE */
/* which comes in the source distribution. */
/* */
/* Check http://www.nomachine.com/licensing.html for applicability. */
/* */
/* NX and NoMachine are trademarks of NoMachine S.r.l. */
/* */
/* All rights reserved. */
/* */
/**************************************************************************/
#include "ClientReadBuffer.h"
#include "ClientChannel.h"
#define PANIC
#define WARNING
#undef TEST
#undef DEBUG
unsigned int ClientReadBuffer::suggestedLength(unsigned int pendingLength)
{
//
// Even if the pending data is not
// enough to make a complete message,
// resize the buffer to accomodate
// it all.
//
unsigned int readLength = pendingLength;
if (pendingLength < remaining_)
{
readLength = remaining_;
}
return readLength;
}
int ClientReadBuffer::locateMessage(const unsigned char *start,
const unsigned char *end,
unsigned int &controlLength,
unsigned int &dataLength,
unsigned int &trailerLength)
{
unsigned int size = end - start;
#ifdef TEST
*logofs << "ClientReadBuffer: Locating message for FD#"
<< transport_ -> fd() << " with " << size
<< " bytes.\n" << logofs_flush;
#endif
if (firstMessage_)
{
if (size < 12)
{
remaining_ = 12 - size;
#ifdef TEST
*logofs << "ClientReadBuffer: No message was located "
<< "with remaining " << remaining_ << ".\n"
<< logofs_flush;
#endif
return 0;
}
if (*start == 0x42)
{
bigEndian_ = 1;
}
else
{
bigEndian_ = 0;
}
channel_ -> setBigEndian(bigEndian_);
dataLength = 12 + RoundUp4(GetUINT(start + 6, bigEndian_)) +
RoundUp4(GetUINT(start + 8, bigEndian_));
//
// Send the data immediately if this is unlikely
// to be a X connection attempt.
//
if (dataLength > 4096)
{
#ifdef WARNING
*logofs << "ClientReadBuffer: WARNING! Flushing suspicious X "
<< "connection with first request of " << dataLength
<< " bytes.\n" << logofs_flush;
#endif
dataLength = size;
}
}
else
{
if (size < 4)
{
remaining_ = 4 - size;
#ifdef TEST
*logofs << "ClientReadBuffer: No message was located "
<< "with remaining " << remaining_ << ".\n"
<< logofs_flush;
#endif
return 0;
}
dataLength = (GetUINT(start + 2, bigEndian_) << 2);
if (dataLength < 4)
{
#ifdef TEST
*logofs << "ClientReadBuffer: WARNING! Assuming length 4 "
<< "for suspicious message of length " << dataLength
<< ".\n" << logofs_flush;
#endif
dataLength = 4;
}
}
#ifdef TEST
*logofs << "ClientReadBuffer: Length of the next message is "
<< dataLength << ".\n" << logofs_flush;
#endif
if (size < dataLength)
{
remaining_ = dataLength - size;
#ifdef TEST
*logofs << "ClientReadBuffer: No message was located "
<< "with remaining " << remaining_ << ".\n"
<< logofs_flush;
#endif
return 0;
}
firstMessage_ = 0;
controlLength = 0;
trailerLength = 0;
remaining_ = 0;
#ifdef TEST
*logofs << "ClientReadBuffer: Located message with "
<< "remaining " << remaining_ << ".\n"
<< logofs_flush;
#endif
return 1;
}
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