332 lines
13 KiB
C
332 lines
13 KiB
C
|
/*
|
||
|
|
*
|
||
|
|
* Copyright (C) 1998-2011, OFFIS e.V.
|
||
|
|
* All rights reserved. See COPYRIGHT file for details.
|
||
|
|
*
|
||
|
|
* This software and supporting documentation were developed by
|
||
|
|
*
|
||
|
|
* OFFIS e.V.
|
||
|
|
* R&D Division Health
|
||
|
|
* Escherweg 2
|
||
|
|
* D-26121 Oldenburg, Germany
|
||
|
|
*
|
||
|
|
*
|
||
|
|
* Module: dcmnet
|
||
|
|
*
|
||
|
|
* Author: Marco Eichelberg
|
||
|
|
*
|
||
|
|
* Purpose:
|
||
|
|
* classes: DcmTransportConnection, DcmTCPConnection
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef DCMTRANS_H
|
||
|
|
#define DCMTRANS_H
|
||
|
|
|
||
|
|
#include "dcmtk/config/osconfig.h" /* make sure OS specific configuration is included first */
|
||
|
|
#include "dcmtk/ofstd/oftypes.h" /* for OFBool */
|
||
|
|
#include "dcmtk/dcmnet/dcmlayer.h" /* for DcmTransportLayerStatus */
|
||
|
|
#include "dcmtk/ofstd/ofstream.h" /* for ostream */
|
||
|
|
|
||
|
|
#define INCLUDE_UNISTD
|
||
|
|
#include "dcmtk/ofstd/ofstdinc.h"
|
||
|
|
|
||
|
|
/** this class represents a TCP/IP based transport connection
|
||
|
|
* which can be a transparent TCP/IP socket communication or a
|
||
|
|
* secure transport protocol such as TLS.
|
||
|
|
*/
|
||
|
|
class DCMTK_DCMNET_EXPORT DcmTransportConnection
|
||
|
|
{
|
||
|
|
public:
|
||
|
|
|
||
|
|
/** constructor.
|
||
|
|
* @param openSocket TCP/IP socket to be used for the transport connection.
|
||
|
|
* the connection must already be establised on socket level. This object
|
||
|
|
* takes over control of the socket.
|
||
|
|
*/
|
||
|
|
DcmTransportConnection(int openSocket);
|
||
|
|
|
||
|
|
/** destructor
|
||
|
|
*/
|
||
|
|
virtual ~DcmTransportConnection();
|
||
|
|
|
||
|
|
/** performs server side handshake on established socket.
|
||
|
|
* This function is used to establish a secure transport connection
|
||
|
|
* over the established TCP connection. Abstract method.
|
||
|
|
* @return TCS_ok if successful, an error code otherwise.
|
||
|
|
*/
|
||
|
|
virtual DcmTransportLayerStatus serverSideHandshake() = 0;
|
||
|
|
|
||
|
|
/** performs client side handshake on established socket.
|
||
|
|
* This function is used to establish a secure transport connection
|
||
|
|
* over the established TCP connection. Abstract method.
|
||
|
|
* @return TCS_ok if successful, an error code otherwise.
|
||
|
|
*/
|
||
|
|
virtual DcmTransportLayerStatus clientSideHandshake() = 0;
|
||
|
|
|
||
|
|
/** performs a re-negotiation of the connection with different
|
||
|
|
* connection parameters. Used to change the parameters of the
|
||
|
|
* secure transport connection. Abstract method.
|
||
|
|
* @param newSuite string identifying the ciphersuite to be negotiated.
|
||
|
|
* @return TCS_ok if successful, an error code otherwise.
|
||
|
|
*/
|
||
|
|
virtual DcmTransportLayerStatus renegotiate(const char *newSuite) = 0;
|
||
|
|
|
||
|
|
/** attempts to read nbyte bytes from the transport connection and
|
||
|
|
* writes them into the given buffer. Abstract method.
|
||
|
|
* @param buf buffer
|
||
|
|
* @param nbyte number of bytes to read
|
||
|
|
* @return number of bytes read, negative number if unsuccessful.
|
||
|
|
*/
|
||
|
|
virtual ssize_t read(void *buf, size_t nbyte) = 0;
|
||
|
|
|
||
|
|
/** attempts to write nbyte bytes from the given buffer
|
||
|
|
* to the transport connection. Abstract method.
|
||
|
|
* @param buf buffer
|
||
|
|
* @param nbyte number of bytes to write
|
||
|
|
* @return number of bytes written, negative number if unsuccessful.
|
||
|
|
*/
|
||
|
|
virtual ssize_t write(void *buf, size_t nbyte) = 0;
|
||
|
|
|
||
|
|
/** Closes the transport connection. If a secure connection
|
||
|
|
* is used, a closure alert is sent before the connection
|
||
|
|
* is closed. Abstract method.
|
||
|
|
*/
|
||
|
|
virtual void close() = 0;
|
||
|
|
|
||
|
|
/** returns the size in bytes of the peer certificate of a secure connection.
|
||
|
|
* May return 0 if connection is transparent TCP/IP.
|
||
|
|
* @return peer certificate length in bytes
|
||
|
|
*/
|
||
|
|
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;
|
||
|
|
|
||
|
|
/** checks if data is available to be read on the transport connection.
|
||
|
|
* Abstract method.
|
||
|
|
* @param timeout maximum number of seconds to wait if no data is available.
|
||
|
|
* If this parameter is 0, the function does not block.
|
||
|
|
* @returns OFTrue if data is available, OFFalse otherwise.
|
||
|
|
*/
|
||
|
|
virtual OFBool networkDataAvailable(int timeout) = 0;
|
||
|
|
|
||
|
|
/** returns OFTrue if this connection is a transparent TCP connection,
|
||
|
|
* OFFalse if the connection is a secure connection.
|
||
|
|
*/
|
||
|
|
virtual OFBool isTransparentConnection() = 0;
|
||
|
|
|
||
|
|
/** dump the characteristics of the current connection
|
||
|
|
* @param str the string to dump into
|
||
|
|
* @return reference to string
|
||
|
|
*/
|
||
|
|
virtual OFString& dumpConnectionParameters(OFString& str) = 0;
|
||
|
|
|
||
|
|
/** prints the characteristics of the current connection
|
||
|
|
* on the given output stream.
|
||
|
|
* @param out output stream
|
||
|
|
* @deprecated Please use the other dumpConnectionParameters() function instead!
|
||
|
|
*/
|
||
|
|
void dumpConnectionParameters(STD_NAMESPACE ostream& out);
|
||
|
|
|
||
|
|
/** returns an error string for a given error code.
|
||
|
|
* @param code error code
|
||
|
|
* @return description for error code
|
||
|
|
*/
|
||
|
|
virtual const char *errorString(DcmTransportLayerStatus code) = 0;
|
||
|
|
|
||
|
|
/** indicates which of the specified transport connections is ready for
|
||
|
|
* reading. If none of the specified transport connections is ready
|
||
|
|
* for reading, this method blocks up to the specified timeout interval
|
||
|
|
* or until one of the connections becomes readable, whatever occurs
|
||
|
|
* first.
|
||
|
|
* @param connections list of transport connections. May contain NULL entries.
|
||
|
|
* Upon successful return of this method, all transport connections which are
|
||
|
|
* not ready for reading are set to NULL in this array.
|
||
|
|
* @param connCount number of entries in connections array.
|
||
|
|
* @param timeout number of seconds for timeout. If timeout is 0, this method
|
||
|
|
* does not block.
|
||
|
|
* @return OFTrue if one or more connections are readable upon return from
|
||
|
|
* this method, OFFalse if no connection is ready for reading.
|
||
|
|
*/
|
||
|
|
static OFBool selectReadableAssociation(DcmTransportConnection *connections[], int connCount, int timeout);
|
||
|
|
|
||
|
|
protected:
|
||
|
|
|
||
|
|
/** returns the socket file descriptor managed by this object.
|
||
|
|
* @return socket file descriptor
|
||
|
|
*/
|
||
|
|
int getSocket() { return theSocket; }
|
||
|
|
|
||
|
|
/** set the socket file descriptor managed by this object.
|
||
|
|
* @param socket file descriptor
|
||
|
|
*/
|
||
|
|
void setSocket(int socket) { theSocket = socket; }
|
||
|
|
|
||
|
|
private:
|
||
|
|
|
||
|
|
/// private undefined copy constructor
|
||
|
|
DcmTransportConnection(const DcmTransportConnection&);
|
||
|
|
|
||
|
|
/// private undefined assignment operator
|
||
|
|
DcmTransportConnection& operator=(const DcmTransportConnection&);
|
||
|
|
|
||
|
|
/** indicates which of the specified transport connections is ready for
|
||
|
|
* reading. If none of the specified transport connections is ready
|
||
|
|
* for reading, this method blocks up to the specified timeout interval
|
||
|
|
* or until one of the connections becomes readable, whatever occurs
|
||
|
|
* first. This method uses a safe approach that also works with secure
|
||
|
|
* transport connections, but which may be slower than a select() system
|
||
|
|
* call and consumes slightly more computation time.
|
||
|
|
* @param connections list of transport connections. May contain NULL entries.
|
||
|
|
* Upon successful return of this method, all transport connections which are
|
||
|
|
* not ready for reading are set to NULL in this array.
|
||
|
|
* @param connCount number of entries in connections array.
|
||
|
|
* @param timeout number of seconds for timeout. If timeout is 0, this method
|
||
|
|
* does not block.
|
||
|
|
* @return OFTrue if one or more connections are readable upon return from
|
||
|
|
* this method, OFFalse if no connection is ready for reading.
|
||
|
|
*/
|
||
|
|
static OFBool safeSelectReadableAssociation(DcmTransportConnection *connections[], int connCount, int timeout);
|
||
|
|
|
||
|
|
/** indicates which of the specified transport connections is ready for
|
||
|
|
* reading. If none of the specified transport connections is ready
|
||
|
|
* for reading, this method blocks up to the specified timeout interval
|
||
|
|
* or until one of the connections becomes readable, whatever occurs
|
||
|
|
* first. This method uses the select() system call. It may only be used
|
||
|
|
* with an array of transparent TCP transport connections. This precondition
|
||
|
|
* must be assured by the caller.
|
||
|
|
* @param connections list of transport connections. May contain NULL entries.
|
||
|
|
* Upon successful return of this method, all transport connections which are
|
||
|
|
* not ready for reading are set to NULL in this array.
|
||
|
|
* @param connCount number of entries in connections array.
|
||
|
|
* @param timeout number of seconds for timeout. If timeout is 0, this method
|
||
|
|
* does not block.
|
||
|
|
* @return OFTrue if one or more connections are readable upon return from
|
||
|
|
* this method, OFFalse if no connection is ready for reading.
|
||
|
|
*/
|
||
|
|
static OFBool fastSelectReadableAssociation(DcmTransportConnection *connections[], int connCount, int timeout);
|
||
|
|
|
||
|
|
/// the socket file descriptor used by the transport connection.
|
||
|
|
int theSocket;
|
||
|
|
};
|
||
|
|
|
||
|
|
|
||
|
|
/** this class represents a TCP/IP based transport connection.
|
||
|
|
*/
|
||
|
|
class DCMTK_DCMNET_EXPORT DcmTCPConnection: public DcmTransportConnection
|
||
|
|
{
|
||
|
|
public:
|
||
|
|
|
||
|
|
/** constructor.
|
||
|
|
* @param openSocket TCP/IP socket to be used for the transport connection.
|
||
|
|
* the connection must already be establised on socket level. This object
|
||
|
|
* takes over control of the socket.
|
||
|
|
*/
|
||
|
|
DcmTCPConnection(int openSocket);
|
||
|
|
|
||
|
|
/** destructor
|
||
|
|
*/
|
||
|
|
virtual ~DcmTCPConnection();
|
||
|
|
|
||
|
|
/** performs server side handshake on established socket.
|
||
|
|
* This function is used to establish a secure transport connection
|
||
|
|
* over the established TCP connection.
|
||
|
|
* @return TCS_ok if successful, an error code otherwise.
|
||
|
|
*/
|
||
|
|
virtual DcmTransportLayerStatus serverSideHandshake();
|
||
|
|
|
||
|
|
/** performs client side handshake on established socket.
|
||
|
|
* This function is used to establish a secure transport connection
|
||
|
|
* over the established TCP connection.
|
||
|
|
* @return TCS_ok if successful, an error code otherwise.
|
||
|
|
*/
|
||
|
|
virtual DcmTransportLayerStatus clientSideHandshake();
|
||
|
|
|
||
|
|
/** performs a re-negotiation of the connection with different
|
||
|
|
* connection parameters. Used to change the parameters of the
|
||
|
|
* secure transport connection.
|
||
|
|
* @param newSuite string identifying the ciphersuite to be negotiated.
|
||
|
|
* @return TCS_ok if successful, an error code otherwise.
|
||
|
|
*/
|
||
|
|
virtual DcmTransportLayerStatus renegotiate(const char *newSuite);
|
||
|
|
|
||
|
|
/** attempts to read nbyte bytes from the transport connection and
|
||
|
|
* writes them into the given buffer.
|
||
|
|
* @param buf buffer
|
||
|
|
* @param nbyte number of bytes to read
|
||
|
|
* @return number of bytes read, negative number if unsuccessful.
|
||
|
|
*/
|
||
|
|
virtual ssize_t read(void *buf, size_t nbyte);
|
||
|
|
|
||
|
|
/** attempts to write nbyte bytes from the given buffer
|
||
|
|
* to the transport connection.
|
||
|
|
* @param buf buffer
|
||
|
|
* @param nbyte number of bytes to write
|
||
|
|
* @return number of bytes written, negative number if unsuccessful.
|
||
|
|
*/
|
||
|
|
virtual ssize_t write(void *buf, size_t nbyte);
|
||
|
|
|
||
|
|
/** Closes the transport connection. If a secure connection
|
||
|
|
* is used, a closure alert is sent before the connection
|
||
|
|
* is closed.
|
||
|
|
*/
|
||
|
|
virtual void close();
|
||
|
|
|
||
|
|
/** returns the size in bytes of the peer certificate of a secure connection.
|
||
|
|
* May return 0 if connection is transparent TCP/IP.
|
||
|
|
* @return peer certificate length in bytes
|
||
|
|
*/
|
||
|
|
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);
|
||
|
|
|
||
|
|
/** checks if data is available to be read on the transport connection.
|
||
|
|
* @param timeout maximum number of seconds to wait if no data is available.
|
||
|
|
* If this parameter is 0, the function does not block.
|
||
|
|
* @returns OFTrue if data is available, OFFalse otherwise.
|
||
|
|
*/
|
||
|
|
virtual OFBool networkDataAvailable(int timeout);
|
||
|
|
|
||
|
|
/** returns OFTrue if this connection is a transparent TCP connection,
|
||
|
|
* OFFalse if the connection is a secure connection.
|
||
|
|
*/
|
||
|
|
virtual OFBool isTransparentConnection();
|
||
|
|
|
||
|
|
/** dump the characteristics of the current connection
|
||
|
|
* @param str the string to dump into
|
||
|
|
* @return reference to string
|
||
|
|
*/
|
||
|
|
virtual OFString& dumpConnectionParameters(OFString& str);
|
||
|
|
|
||
|
|
/** returns an error string for a given error code.
|
||
|
|
* @param code error code
|
||
|
|
* @return description for error code
|
||
|
|
*/
|
||
|
|
virtual const char *errorString(DcmTransportLayerStatus code);
|
||
|
|
|
||
|
|
private:
|
||
|
|
|
||
|
|
/// private undefined copy constructor
|
||
|
|
DcmTCPConnection(const DcmTCPConnection&);
|
||
|
|
|
||
|
|
/// private undefined assignment operator
|
||
|
|
DcmTCPConnection& operator=(const DcmTCPConnection&);
|
||
|
|
|
||
|
|
};
|
||
|
|
|
||
|
|
#endif
|