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authorReinhard Tartler <siretart@tauware.de>2011-11-13 09:27:51 +0100
committerReinhard Tartler <siretart@tauware.de>2011-11-13 09:27:51 +0100
commit3e924126b56c4d421e8263d25f6b14aa4ceed047 (patch)
tree921403de7b834fb1ac89f97d84ce105e0b487051 /nxcomp/Transport.h
parenta840692edc9c6d19cd7c057f68e39c7d95eb767d (diff)
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Imported nxcomp-3.1.0-4.tar.gznxcomp/3.1.0-4
Summary: Imported nxcomp-3.1.0-4.tar.gz Keywords: Imported nxcomp-3.1.0-4.tar.gz into Git repository
Diffstat (limited to 'nxcomp/Transport.h')
-rwxr-xr-xnxcomp/Transport.h569
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diff --git a/nxcomp/Transport.h b/nxcomp/Transport.h
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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. */
+/* */
+/**************************************************************************/
+
+#ifndef Transport_H
+#define Transport_H
+
+#include <zlib.h>
+#include <errno.h>
+
+#include <sys/ioctl.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+
+#include "Misc.h"
+#include "Control.h"
+
+#include "Types.h"
+#include "Timestamp.h"
+#include "Socket.h"
+
+//
+// Set the verbosity level.
+//
+
+#define PANIC
+#define WARNING
+#undef TEST
+#undef DEBUG
+
+//
+// Define this to lock and unlock the
+// memory-to-memory transport buffers
+// before they are accessed. The code
+// is outdated and doesn't work with
+// the current pthread library.
+//
+
+#undef THREADS
+
+//
+// Define this to know when a socket
+// is created or destroyed.
+//
+
+#undef REFERENCES
+
+//
+// Size of buffer if not set by user.
+//
+
+#define TRANSPORT_BUFFER_DEFAULT_SIZE 16384
+
+//
+// Type of transport.
+//
+
+typedef enum
+{
+ transport_base,
+ transport_proxy,
+ transport_agent,
+ transport_last_tag
+
+} T_transport_type;
+
+//
+// This class handles the buffered I/O on
+// the network sockets.
+//
+
+//
+// TODO: This class is useful but adds a lot of
+// overhead. There are many improvements we can
+// make here:
+//
+// - There should be a generic Buffer class, ac-
+// comodating a list of memory buffers. This
+// would enable the use of the readv() and
+// writev() functions to perform the I/O on
+// the socket.
+//
+// - The buffering should be moved to the Write-
+// Buffer and ReadBuffer classes. By performing
+// the buffering here and there, we are dupli-
+// cating a lot of code and are adding a lot
+// of useless memory copies.
+//
+// - Stream compression should be removed. The
+// proxy should compress the frames based on
+// the type and should include the length of
+// the decompressed data in the header of the
+// packet. Besides avoiding the compression
+// of packets that cannot be reduced in size,
+// we would also save the additional memory
+// allocations due to the fact that we don't
+// know the size of the decode buffer at the
+// time we read the packet from the network.
+//
+// - The other utilities implemented here, like
+// the functions forcing a write on the socket
+// or waiting for more data to become available
+// should be moved to the Proxy or the Channel
+// classes.
+//
+
+class Transport
+{
+ public:
+
+ //
+ // Member functions.
+ //
+
+ Transport(int fd);
+
+ virtual ~Transport();
+
+ int fd() const
+ {
+ return fd_;
+ }
+
+ T_transport_type getType()
+ {
+ return type_;
+ }
+
+ //
+ // Virtual members redefined by proxy
+ // and 'memory-to-memory' I/O layers.
+ //
+
+ virtual int read(unsigned char *data, unsigned int size);
+
+ virtual int write(T_write type, const unsigned char *data, const unsigned int size);
+
+ virtual int flush();
+
+ virtual int drain(int limit, int timeout);
+
+ virtual void finish()
+ {
+ fullReset();
+
+ finish_ = 1;
+ }
+
+ virtual int length() const
+ {
+ return w_buffer_.length_;
+ }
+
+ virtual int pending() const
+ {
+ return 0;
+ }
+
+ virtual int readable() const
+ {
+ return GetBytesReadable(fd_);
+ }
+
+ virtual int writable() const
+ {
+ return GetBytesWritable(fd_);
+ }
+
+ virtual int queued() const
+ {
+ return GetBytesQueued(fd_);
+ }
+
+ virtual int flushable() const
+ {
+ return 0;
+ }
+
+ virtual int wait(int timeout) const;
+
+ void setSize(unsigned int initialSize,
+ unsigned int thresholdSize,
+ unsigned int maximumSize);
+
+ //
+ // Return a pointer to the data
+ // in the read buffer.
+ //
+
+ virtual unsigned int getPending(unsigned char *&data)
+ {
+ data = NULL;
+
+ return 0;
+ }
+
+ virtual void pendingReset()
+ {
+ }
+
+ virtual void partialReset()
+ {
+ partialReset(w_buffer_);
+ }
+
+ virtual void fullReset();
+
+ int blocked() const
+ {
+ return blocked_;
+ }
+
+ protected:
+
+ //
+ // Make room in the buffer to accomodate
+ // at least size bytes.
+ //
+
+ int resize(T_buffer &buffer, const int &size);
+
+ void partialReset(T_buffer &buffer)
+ {
+ if (buffer.length_ == 0 &&
+ (buffer.data_.size() > initialSize_ ||
+ buffer.data_.capacity() > initialSize_))
+ {
+ fullReset(buffer);
+ }
+ }
+
+ void fullReset(T_buffer &buffer);
+
+ //
+ // Data members.
+ //
+
+ int fd_;
+
+ int blocked_;
+ int finish_;
+
+ T_buffer w_buffer_;
+
+ unsigned int initialSize_;
+ unsigned int thresholdSize_;
+ unsigned int maximumSize_;
+
+ T_transport_type type_;
+
+ private:
+
+ #ifdef REFERENCES
+
+ static int references_;
+
+ #endif
+};
+
+//
+// This class handles buffered I/O and
+// compression of the proxy stream.
+//
+
+class ProxyTransport : public Transport
+{
+ public:
+
+ ProxyTransport(int fd);
+
+ virtual ~ProxyTransport();
+
+ virtual int read(unsigned char *data, unsigned int size);
+
+ virtual int write(T_write type, const unsigned char *data, const unsigned int size);
+
+ virtual int flush();
+
+ //
+ // Same as in the base class.
+ //
+ // virtual int drain(int limit, int timeout);
+ //
+ // virtual void finish();
+ //
+
+ //
+ // Same as in the base class.
+ //
+ // virtual int length() const
+ //
+
+ virtual int pending() const
+ {
+ return r_buffer_.length_;
+ }
+
+ //
+ // Same as in the base class.
+ //
+ // virtual int readable() const;
+ //
+ // virtual int writable() const;
+ //
+ // virtual int queued() const;
+ //
+
+ virtual int flushable() const
+ {
+ return flush_;
+ }
+
+ //
+ // Same as in the base class, but
+ // should not be called.
+ //
+ // int drained() const;
+ //
+ // Same as in the base class.
+ //
+ // virtual int wait(int timeout) const;
+ //
+ // Same as in the base class.
+ //
+ // void setSize(unsigned int initialSize,
+ // unsigned int thresholdSize,
+ // unsigned int maximumSize);
+ //
+
+ virtual unsigned int getPending(unsigned char *&data);
+
+ virtual void pendingReset()
+ {
+ owner_ = 1;
+ }
+
+ virtual void partialReset()
+ {
+ if (owner_ == 1)
+ {
+ Transport::partialReset(r_buffer_);
+ }
+
+ Transport::partialReset(w_buffer_);
+ }
+
+ virtual void fullReset();
+
+ //
+ // Same as in the base class.
+ //
+ // int blocked() const;
+ //
+
+ protected:
+
+ int flush_;
+ int owner_;
+
+ T_buffer r_buffer_;
+
+ z_stream r_stream_;
+ z_stream w_stream_;
+
+ private:
+
+ #ifdef REFERENCES
+
+ static int references_;
+
+ #endif
+};
+
+//
+// Handle memory-to-memory data transfers between
+// an agent and the proxy.
+//
+
+class AgentTransport : public Transport
+{
+ public:
+
+ AgentTransport(int fd);
+
+ virtual ~AgentTransport();
+
+ virtual int read(unsigned char *data, unsigned int size);
+
+ virtual int write(T_write type, const unsigned char *data, const unsigned int size);
+
+ //
+ // These two should never be called.
+ //
+
+ virtual int flush();
+
+ virtual int drain(int limit, int timeout);
+
+ //
+ // Same as in the base class.
+ //
+ // virtual void finish();
+ //
+
+ //
+ // Same as in the base class.
+ //
+ // virtual int length() const
+ //
+
+ virtual int pending() const
+ {
+ return r_buffer_.length_;
+ }
+
+ //
+ // These are intended to operate only
+ // on the internal buffers.
+ //
+
+ virtual int readable() const
+ {
+ return r_buffer_.length_;
+ }
+
+ virtual int writable() const
+ {
+ return control -> TransportMaximumBufferSize;
+ }
+
+ virtual int queued() const
+ {
+ return 0;
+ }
+
+ //
+ // Same as in the base class.
+ //
+ // virtual int flushable() const;
+ //
+ // Same as in the base class, but
+ // should not be called.
+ //
+ // int drained() const;
+ //
+
+ //
+ // Return immediately or will
+ // block until the timeout.
+ //
+
+ virtual int wait(int timeout) const
+ {
+ return 0;
+ }
+
+ //
+ // Same as in the base class.
+ //
+ // void setSize(unsigned int initialSize,
+ // unsigned int thresholdSize,
+ // unsigned int maximumSize);
+ //
+
+ virtual unsigned int getPending(unsigned char *&data);
+
+ virtual void pendingReset()
+ {
+ owner_ = 1;
+ }
+
+ virtual void partialReset()
+ {
+ if (owner_ == 1)
+ {
+ Transport::partialReset(r_buffer_);
+ }
+
+ Transport::partialReset(w_buffer_);
+ }
+
+ virtual void fullReset();
+
+ //
+ // Same as in the base class.
+ //
+ // int blocked() const;
+ //
+
+ //
+ // The following are specific of the
+ // memory-to-memory transport.
+ //
+
+ int enqueue(const char *data, const int size);
+
+ int dequeue(char *data, int size);
+
+ int queuable()
+ {
+ //
+ // Always allow the agent to enqueue
+ // more data.
+ //
+
+ return control -> TransportMaximumBufferSize;
+ }
+
+ int dequeuable();
+
+ protected:
+
+ //
+ // Lock the buffer to handle reads and
+ // writes safely.
+ //
+
+ #ifdef THREADS
+
+ int lockRead();
+ int lockWrite();
+
+ int unlockRead();
+ int unlockWrite();
+
+ #endif
+
+ //
+ // Data members.
+ //
+
+ int owner_;
+
+ T_buffer r_buffer_;
+
+ //
+ // Mutexes for safe read and write.
+ //
+
+ #ifdef THREADS
+
+ pthread_mutex_t m_read_;
+ pthread_mutex_t m_write_;
+
+ #endif
+
+ private:
+
+ #ifdef REFERENCES
+
+ static int references_;
+
+ #endif
+};
+
+#endif /* Transport_H */