dcmnet/include/dcmtrans.h

/*
 *
 *  Copyright (C) 1998-2003, OFFIS
 *
 *  This software and supporting documentation were developed by
 *
 *    Kuratorium OFFIS e.V.
 *    Healthcare Information and Communication Systems
 *    Escherweg 2
 *    D-26121 Oldenburg, Germany
 *
 *  THIS SOFTWARE IS MADE AVAILABLE,  AS IS,  AND OFFIS MAKES NO  WARRANTY
 *  REGARDING  THE  SOFTWARE,  ITS  PERFORMANCE,  ITS  MERCHANTABILITY  OR
 *  FITNESS FOR ANY PARTICULAR USE, FREEDOM FROM ANY COMPUTER DISEASES  OR
 *  ITS CONFORMITY TO ANY SPECIFICATION. THE ENTIRE RISK AS TO QUALITY AND
 *  PERFORMANCE OF THE SOFTWARE IS WITH THE USER.
 *
 *  Module: dcmnet
 *
 *  Author: Marco Eichelberg
 *
 *  Purpose:
 *    classes: DcmTransportConnection, DcmTCPConnection
 *
 *  Last Update:      $Author: joergr $
 *  Update Date:      $Date: 2003/12/05 10:39:45 $
 *  CVS/RCS Revision: $Revision: 1.5 $
 *  Status:           $State: Exp $
 *
 *  CVS/RCS Log at end of file
 *
 */

#ifndef DCMTRANS_H
#define DCMTRANS_H

#include "osconfig.h"    /* make sure OS specific configuration is included first */
#include "oftypes.h"     /* for OFBool */
#include "dcmlayer.h"    /* for DcmTransportLayerStatus */
#include "ofstream.h"    /* for ostream */

BEGIN_EXTERN_C
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
END_EXTERN_C

class DcmTransportConnection
{
public:

  DcmTransportConnection(int openSocket);

  virtual ~DcmTransportConnection();

  virtual DcmTransportLayerStatus serverSideHandshake() = 0;

  virtual DcmTransportLayerStatus clientSideHandshake() = 0;

  virtual DcmTransportLayerStatus renegotiate(const char *newSuite) = 0;

  virtual ssize_t read(void *buf, size_t nbyte) = 0;

  virtual ssize_t write(void *buf, size_t nbyte) = 0;

  virtual void close() = 0;

  virtual unsigned long getPeerCertificateLength() = 0;

  /* copies the peer certificate of a secure connection into a buffer
   * specified by the caller. If the buffer is too small to hold the
   * certificate, nothing is copied and zero is returned.
   * @param buf buffer into which the certificate is written
   * @param bufLen size of the buffer in bytes
   * @return number of bytes written, always less or equal bufLen.
   */
  virtual unsigned long getPeerCertificate(void *buf, unsigned long bufLen) = 0;

  virtual OFBool networkDataAvailable(int timeout) = 0;

  virtual OFBool isTransparentConnection() = 0;

  virtual void dumpConnectionParameters(ostream &out) = 0;

  virtual const char *errorString(DcmTransportLayerStatus code) = 0;

  static OFBool selectReadableAssociation(DcmTransportConnection *connections[], int connCount, int timeout);

protected:

  int getSocket() { return theSocket; }

private:

  DcmTransportConnection(const DcmTransportConnection&);

  DcmTransportConnection& operator=(const DcmTransportConnection&);

  static OFBool safeSelectReadableAssociation(DcmTransportConnection *connections[], int connCount, int timeout);

  static OFBool fastSelectReadableAssociation(DcmTransportConnection *connections[], int connCount, int timeout);

  int theSocket;
};


class DcmTCPConnection: public DcmTransportConnection
{
public:

  DcmTCPConnection(int openSocket);

  virtual ~DcmTCPConnection();

  virtual DcmTransportLayerStatus serverSideHandshake();

  virtual DcmTransportLayerStatus clientSideHandshake();

  virtual DcmTransportLayerStatus renegotiate(const char *newSuite);

  virtual ssize_t read(void *buf, size_t nbyte);

  virtual ssize_t write(void *buf, size_t nbyte);

  virtual void close();

  virtual unsigned long getPeerCertificateLength();

  /* copies the peer certificate of a secure connection into a buffer
   * specified by the caller. If the buffer is too small to hold the
   * certificate, nothing is copied and zero is returned.
   * @param buf buffer into which the certificate is written
   * @param bufLen size of the buffer in bytes
   * @return number of bytes written, always less or equal bufLen.
   */
  virtual unsigned long getPeerCertificate(void *buf, unsigned long bufLen);

  virtual OFBool networkDataAvailable(int timeout);

  virtual OFBool isTransparentConnection();

  virtual void dumpConnectionParameters(ostream &out);

  virtual const char *errorString(DcmTransportLayerStatus code);

private:

  DcmTCPConnection(const DcmTCPConnection&);

  DcmTCPConnection& operator=(const DcmTCPConnection&);

};

#endif

/*
 *  $Log: dcmtrans.h,v $
 *  Revision 1.5  2003/12/05 10:39:45  joergr
 *  Removed leading underscore characters from preprocessor symbols (reserved
 *  symbols).
 *
 *  Revision 1.4  2003/07/04 13:27:15  meichel
 *  Added include for ofstream.h, to make sure ofstream is correctly defined
 *
 *  Revision 1.3  2001/06/01 15:50:04  meichel
 *  Updated copyright header
 *
 *  Revision 1.2  2000/10/10 12:06:53  meichel
 *  Updated transport layer error codes and routines for printing
 *    connection parameters.
 *
 *  Revision 1.1  2000/08/10 14:50:53  meichel
 *  Added initial OpenSSL support.
 *
 *
 */

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