aboutsummaryrefslogtreecommitdiff
path: root/nxcomp/ClientReadBuffer.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'nxcomp/ClientReadBuffer.cpp')
-rw-r--r--nxcomp/ClientReadBuffer.cpp166
1 files changed, 166 insertions, 0 deletions
diff --git a/nxcomp/ClientReadBuffer.cpp b/nxcomp/ClientReadBuffer.cpp
new file mode 100644
index 000000000..b32033b17
--- /dev/null
+++ b/nxcomp/ClientReadBuffer.cpp
@@ -0,0 +1,166 @@
+/**************************************************************************/
+/* */
+/* Copyright (c) 2001, 2010 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 Medialogic S.p.A. */
+/* */
+/* 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;
+}