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. More...

Inheritance diagram for DcmTransportConnection:

Public Member Functions
	DcmTransportConnection (DcmNativeSocketType openSocket)
	constructor. More...

virtual	~DcmTransportConnection ()
	destructor

virtual OFCondition	serverSideHandshake ()=0
	performs server side handshake on established socket. More...

virtual OFCondition	clientSideHandshake ()=0
	performs client side handshake on established socket. More...

virtual OFCondition	renegotiate (const char *newSuite)=0
	performs a re-negotiation of the connection with different connection parameters. More...

virtual ssize_t	read (void *buf, size_t nbyte)=0
	attempts to read nbyte bytes from the transport connection and writes them into the given buffer. More...

virtual ssize_t	write (void *buf, size_t nbyte)=0
	attempts to write nbyte bytes from the given buffer to the transport connection. More...

virtual void	close ()=0
	Closes the transport connection. More...

virtual void	closeTransportConnection ()=0
	Closes the transport connection directly. More...

virtual unsigned long	getPeerCertificateLength ()=0
	returns the size in bytes of the peer certificate of a secure connection. More...

virtual OFBool	networkDataAvailable (int timeout)=0
	checks if data is available to be read on the transport connection. More...

virtual OFBool	isTransparentConnection ()=0
	returns OFTrue if this connection is a transparent TCP connection, OFFalse if the connection is a secure connection.

virtual OFString &	dumpConnectionParameters (OFString &str)=0
	dump the characteristics of the current connection More...

virtual void	setParentProcessMode ()
	this method must be called by the parent process after a fork() if the TLS connection is handled by the child process. More...

virtual OFBool	isParentProcessMode () const
	check if the connection has been set to parent process mode by a prior call to setParentProcessMode().

OFdeprecated void	dumpConnectionParameters (STD_NAMESPACE ostream &out)
	prints the characteristics of the current connection on the given output stream. More...

Static Public Member Functions
static OFBool	selectReadableAssociation (DcmTransportConnection *connections[], int connCount, int timeout)
	indicates which of the specified transport connections is ready for reading. More...

Protected Member Functions
DcmNativeSocketType	getSocket ()
	returns the socket file descriptor managed by this object. More...

void	setSocket (DcmNativeSocketType socket)
	set the socket file descriptor managed by this object. More...

Private Member Functions
	DcmTransportConnection (const DcmTransportConnection &)
	private undefined copy constructor

DcmTransportConnection &	operator= (const DcmTransportConnection &)
	private undefined assignment operator

Static Private Member Functions
static OFBool	safeSelectReadableAssociation (DcmTransportConnection *connections[], int connCount, int timeout)
	indicates which of the specified transport connections is ready for reading. More...

static OFBool	fastSelectReadableAssociation (DcmTransportConnection *connections[], int connCount, int timeout)
	indicates which of the specified transport connections is ready for reading. More...

Private Attributes
DcmNativeSocketType	theSocket
	the socket file descriptor/handle used by the transport connection.

OFBool	isForkedParent
	a flag that must be set in the parent process after a fork() if the TLS connection is handled by the child process. More...

Detailed Description

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.

Constructor & Destructor Documentation

◆ DcmTransportConnection()

DcmTransportConnection::DcmTransportConnection ( DcmNativeSocketType openSocket )

constructor.

Parameters

openSocket TCP/IP socket to be used for the transport connection. the connection must already be established on socket level. This object takes over control of the socket.

Member Function Documentation

◆ clientSideHandshake()

virtual OFCondition DcmTransportConnection::clientSideHandshake ( )

pure virtual

performs client side handshake on established socket.

This function is used to establish a secure transport connection over the established TCP connection. Abstract method.

Returns: EC_Normal if successful, an error code otherwise.

Implemented in DcmTLSConnection, and DcmTCPConnection.

◆ close()

virtual void DcmTransportConnection::close ( )

pure virtual

Closes the transport connection.

If a secure connection is used, a closure alert is sent before the connection is closed. Abstract method.

Implemented in DcmTLSConnection, and DcmTCPConnection.

◆ closeTransportConnection()

virtual void DcmTransportConnection::closeTransportConnection ( )

pure virtual

Closes the transport connection directly.

If a secure connection is used, a closure alert is NOT sent before the connection is closed. Abstract method.

Implemented in DcmTLSConnection, and DcmTCPConnection.

◆ dumpConnectionParameters() [1/2]

virtual OFString& DcmTransportConnection::dumpConnectionParameters ( OFString & str )

pure virtual

dump the characteristics of the current connection

Parameters

str	the string to dump into

Returns: reference to string

Implemented in DcmTLSConnection, and DcmTCPConnection.

◆ dumpConnectionParameters() [2/2]

OFdeprecated void DcmTransportConnection::dumpConnectionParameters ( STD_NAMESPACE ostream & out )

prints the characteristics of the current connection on the given output stream.

Parameters

out	output stream

Deprecated:: Please use the other dumpConnectionParameters() function instead!

◆ fastSelectReadableAssociation()

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

staticprivate

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 poll() or select() system call. It may only be used with an array of transparent TCP transport connections. This precondition must be assured by the caller.

Parameters

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.
connCount	number of entries in connections array.
timeout	number of seconds for timeout. If timeout is 0, this method does not block.

Returns: OFTrue if one or more connections are readable upon return from this method, OFFalse if no connection is ready for reading.

◆ getPeerCertificateLength()

virtual unsigned long DcmTransportConnection::getPeerCertificateLength ( )

pure virtual

returns the size in bytes of the peer certificate of a secure connection.

May return 0 if connection is transparent TCP/IP.

Returns: peer certificate length in bytes

Implemented in DcmTLSConnection, and DcmTCPConnection.

◆ getSocket()

DcmNativeSocketType DcmTransportConnection::getSocket ( )

inlineprotected

returns the socket file descriptor managed by this object.

Returns: socket file descriptor

◆ networkDataAvailable()

virtual OFBool DcmTransportConnection::networkDataAvailable ( int timeout )

pure virtual

checks if data is available to be read on the transport connection.

Abstract method.

Parameters

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.

Implemented in DcmTLSConnection, and DcmTCPConnection.

◆ read()

virtual ssize_t DcmTransportConnection::read	(	void *	buf,
		size_t	nbyte
	)

pure virtual

attempts to read nbyte bytes from the transport connection and writes them into the given buffer.

Abstract method.

Parameters

buf	buffer
nbyte	number of bytes to read

Returns: number of bytes read, negative number if unsuccessful.

Implemented in DcmTLSConnection, and DcmTCPConnection.

◆ renegotiate()

virtual OFCondition DcmTransportConnection::renegotiate ( const char * newSuite )

pure virtual

performs a re-negotiation of the connection with different connection parameters.

Used to change the parameters of the secure transport connection. Abstract method.

Parameters

newSuite string identifying the ciphersuite to be negotiated.

Returns: EC_Normal if successful, an error code otherwise.

Implemented in DcmTLSConnection, and DcmTCPConnection.

◆ safeSelectReadableAssociation()

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

staticprivate

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.

Parameters

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.
connCount	number of entries in connections array.
timeout	number of seconds for timeout. If timeout is 0, this method does not block.

Returns: OFTrue if one or more connections are readable upon return from this method, OFFalse if no connection is ready for reading.

◆ selectReadableAssociation()

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

static

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.

Parameters

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.
connCount	number of entries in connections array.
timeout	number of seconds for timeout. If timeout is 0, this method does not block.

Returns: OFTrue if one or more connections are readable upon return from this method, OFFalse if no connection is ready for reading.

◆ serverSideHandshake()

virtual OFCondition DcmTransportConnection::serverSideHandshake ( )

pure virtual

performs server side handshake on established socket.

This function is used to establish a secure transport connection over the established TCP connection. Abstract method.

Returns: EC_Normal if successful, an error code otherwise.

Implemented in DcmTLSConnection, and DcmTCPConnection.

◆ setParentProcessMode()

virtual void DcmTransportConnection::setParentProcessMode ( )

virtual

this method must be called by the parent process after a fork() if the TLS connection is handled by the child process.

This will prevent the destructor in the parent process from calling SSL_shutdown().

◆ setSocket()

void DcmTransportConnection::setSocket ( DcmNativeSocketType socket )

inlineprotected

set the socket file descriptor managed by this object.

Parameters

socket file descriptor

◆ write()

virtual ssize_t DcmTransportConnection::write	(	void *	buf,
		size_t	nbyte
	)

pure virtual

attempts to write nbyte bytes from the given buffer to the transport connection.

Abstract method.

Parameters

buf	buffer
nbyte	number of bytes to write

Returns: number of bytes written, negative number if unsuccessful.

Implemented in DcmTLSConnection, and DcmTCPConnection.

Member Data Documentation

◆ isForkedParent

OFBool DcmTransportConnection::isForkedParent

private

a flag that must be set in the parent process after a fork() if the TLS connection is handled by the child process.

This will prevent the destructor in the parent process from calling SSL_shutdown().

The documentation for this class was generated from the following file:

dcmnet/include/dcmtk/dcmnet/dcmtrans.h

Public Member Functions

Static Public Member Functions

Protected Member Functions

Private Member Functions

Static Private Member Functions

Private Attributes

Detailed Description

Constructor & Destructor Documentation

◆ DcmTransportConnection()

Member Function Documentation

◆ clientSideHandshake()

◆ close()

◆ closeTransportConnection()

◆ dumpConnectionParameters() [1/2]

◆ dumpConnectionParameters() [2/2]

◆ fastSelectReadableAssociation()

◆ getPeerCertificateLength()

◆ getSocket()

◆ networkDataAvailable()

◆ read()

◆ renegotiate()

◆ safeSelectReadableAssociation()

◆ selectReadableAssociation()

◆ serverSideHandshake()

◆ setParentProcessMode()

◆ setSocket()

◆ write()

Member Data Documentation

◆ isForkedParent