KDELibs4Support - KNetwork::KServerSocket Class Reference

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#include <k3serversocket.h>

Inheritance diagram for KNetwork::KServerSocket:

Signals
void	bound (const KNetwork::KResolverEntry &local)

void	closed ()

void	gotError (int code)

void	hostFound ()

void	readyAccept ()

Public Member Functions
	KServerSocket (QObject *parent=nullptr)

KDELIBS4SUPPORT_DEPRECATED	KServerSocket (const QString &service, QObject *parent=nullptr)

	KServerSocket (const QString &node, const QString &service, QObject *parent=nullptr)

	~KServerSocket ()

KStreamSocket *	accept () override

virtual bool	bind (const QString &node, const QString &service)

virtual bool	bind (const QString &service)

virtual bool	bind ()

bool	bind (const KResolverEntry &address) override

void	close () override

KSocketAddress	externalAddress () const override

bool	listen (int backlog=5) override

KSocketAddress	localAddress () const override

virtual bool	lookup ()

KResolver &	resolver () const

const KResolverResults &	resolverResults () const

void	setAcceptBuffered (bool enable)

void	setAddress (const QString &service)

void	setAddress (const QString &node, const QString &service)

void	setFamily (int families)

void	setResolutionEnabled (bool enable)

void	setTimeout (int msecs)

Public Member Functions inherited from QObject
	QObject (QObject *parent)

bool	blockSignals (bool block)

const QObjectList &	children () const

QMetaObject::Connection	connect (const QObject sender, const char signal, const char *method, Qt::ConnectionType type) const

void	deleteLater ()

void	destroyed (QObject *obj)

bool	disconnect (const char signal, const QObject receiver, const char *method) const

bool	disconnect (const QObject receiver, const char method) const

void	dumpObjectInfo ()

void	dumpObjectTree ()

QList< QByteArray >	dynamicPropertyNames () const

virtual bool	event (QEvent *e)

virtual bool	eventFilter (QObject watched, QEvent event)

T	findChild (const QString &name, QFlags< Qt::FindChildOption > options) const

QList< T >	findChildren (const QString &name, QFlags< Qt::FindChildOption > options) const

QList< T >	findChildren (const QRegExp &regExp, QFlags< Qt::FindChildOption > options) const

QList< T >	findChildren (const QRegularExpression &re, QFlags< Qt::FindChildOption > options) const

bool	inherits (const char *className) const

void	installEventFilter (QObject *filterObj)

bool	isWidgetType () const

bool	isWindowType () const

void	killTimer (int id)

virtual const QMetaObject *	metaObject () const

void	moveToThread (QThread *targetThread)

QString	objectName () const

void	objectNameChanged (const QString &objectName)

QObject *	parent () const

QVariant	property (const char *name) const

void	removeEventFilter (QObject *obj)

void	setObjectName (const QString &name)

void	setParent (QObject *parent)

bool	setProperty (const char *name, const QVariant &value)

bool	signalsBlocked () const

int	startTimer (int interval, Qt::TimerType timerType)

QThread *	thread () const

Public Member Functions inherited from KNetwork::KPassiveSocketBase
	KPassiveSocketBase ()

virtual	~KPassiveSocketBase ()

Public Member Functions inherited from KNetwork::KSocketBase
	KSocketBase ()

virtual	~KSocketBase ()

bool	addressReuseable () const

bool	blocking () const

bool	broadcast () const

SocketError	error () const

QString	errorString () const

bool	isIPv6Only () const

QMutex *	mutex () const

bool	noDelay () const

virtual bool	setAddressReuseable (bool enable)

virtual bool	setBlocking (bool enable)

virtual bool	setBroadcast (bool enable)

virtual bool	setIPv6Only (bool enable)

virtual bool	setNoDelay (bool enable)

int	setRequestedCapabilities (int add, int remove=0)

virtual void	setSocketDevice (KSocketDevice *device)

KSocketDevice *	socketDevice () const

Protected Member Functions
void	copyError ()

bool	setSocketOptions (int opts) override

Protected Member Functions inherited from QObject
virtual void	childEvent (QChildEvent *event)

virtual void	connectNotify (const QMetaMethod &signal)

virtual void	customEvent (QEvent *event)

virtual void	disconnectNotify (const QMetaMethod &signal)

bool	isSignalConnected (const QMetaMethod &signal) const

int	receivers (const char *signal) const

QObject *	sender () const

int	senderSignalIndex () const

virtual void	timerEvent (QTimerEvent *event)

Protected Member Functions inherited from KNetwork::KSocketBase
bool	hasDevice () const

void	resetError ()

void	setError (SocketError error)

virtual int	socketOptions () const

Additional Inherited Members
Public Types inherited from KNetwork::KSocketBase
enum	SocketError { NoError = 0, LookupFailure, AddressInUse, AlreadyCreated, AlreadyBound, AlreadyConnected, NotConnected, NotBound, NotCreated, WouldBlock, ConnectionRefused, ConnectionTimedOut, InProgress, NetFailure, NotSupported, Timeout, UnknownError, RemotelyDisconnected }

enum	SocketOptions { Blocking = 0x01, AddressReuseable = 0x02, IPv6Only = 0x04, Keepalive = 0x08, Broadcast = 0x10, NoDelay = 0x20 }

Properties inherited from QObject
	objectName

Static Public Member Functions inherited from QObject
QMetaObject::Connection	connect (const QObject sender, const char signal, const QObject receiver, const char method, Qt::ConnectionType type)

QMetaObject::Connection	connect (const QObject sender, const QMetaMethod &signal, const QObject receiver, const QMetaMethod &method, Qt::ConnectionType type)

QMetaObject::Connection	connect (const QObject sender, PointerToMemberFunction signal, const QObject receiver, PointerToMemberFunction method, Qt::ConnectionType type)

QMetaObject::Connection	connect (const QObject *sender, PointerToMemberFunction signal, Functor functor)

QMetaObject::Connection	connect (const QObject sender, PointerToMemberFunction signal, const QObject context, Functor functor, Qt::ConnectionType type)

bool	disconnect (const QMetaObject::Connection &connection)

bool	disconnect (const QObject sender, const char signal, const QObject receiver, const char method)

bool	disconnect (const QObject sender, PointerToMemberFunction signal, const QObject receiver, PointerToMemberFunction method)

bool	disconnect (const QObject sender, const QMetaMethod &signal, const QObject receiver, const QMetaMethod &method)

QString	tr (const char sourceText, const char disambiguation, int n)

QString	trUtf8 (const char sourceText, const char disambiguation, int n)

Static Public Member Functions inherited from KNetwork::KSocketBase
static QString	errorString (SocketError code)

static bool	isFatalError (int code)

Detailed Description

A server socket for accepting connections.

This class provides functionality for creating a socket to listen for incoming connections and subsequently accept them.

To use this class, you must first set the parameters for the listening socket's address, then place it in listening mode.

A typical example would look like:

QString service = "http";
KServerSocket *ss = new KServerSocket(service);
connect(ss, SIGNAL(readyAccept()), this, SLOT(slotReadyAccept()));
connect(ss, SIGNAL(gotError(int)), this, SLOT(slotSocketError(int)));
ss->listen();

In this case, this class will place the socket into listening mode on the service pointed to by service and will emit the readyAccept() signal when a connection is ready for accepting. The called slot is responsible for calling accept().

The location of the services file (where service is looked up) is defined by _PATH_SERVICES in /usr/include/netdb.h. This is usually set to /etc/services. See RFC 1700 for more information on services. You can specify service as a port number directly, rather than as a service name. This is discouraged as it prevents the end user from easily modifying the port number.

For another example of usage, this below code attempts to make a connection on any port within a range:

KServerSocket *ss = new KServerSocket();
ss->setFamily(KResolver::InetFamily);
bool found = false;
for( unsigned int port = firstport; port <= lastport; ++port) {
  ss->setAddress( QString::number( port ) );
  bool success = ss->listen();
  if( found = ( success && ss->error() ==
                           KSocketBase::NoError ) )
    break;
  ss->close();
}
if( !found ) {
  // Couldn't connect to any port.
} else {
  connect(ss, SIGNAL(readyAccept()), this, SLOT(slotReadyAccept()));
  connect(ss, SIGNAL(gotError(int)), this, SLOT(slotSocketError(int)));
  ss->listen();
}

The called slot slotReadyAccept() is responsible for calling accept().

It is important to note that accept() can return either an object of type KNetwork::KStreamSocket or KNetwork::KBufferedSocket (default). If you want to accept a non-buffered socket, you must first call setAcceptBuffered.

Warning: If you use KServerSocket in an auxiliary (non-GUI) thread, you need to accept only KNetwork::KStreamSocket objects.

See also: KNetwork::KStreamSocket, KNetwork::KBufferedSocket

Author: Thiago Macieira thiag[email protected][email protected][email protected]e.org

Deprecated:: Use KSocketFactory or KLocalSocket instead

Definition at line 109 of file k3serversocket.h.

Constructor & Destructor Documentation

KServerSocket::KServerSocket ( QObject * parent = nullptr )

Default constructor.

If the binding address isn't changed by setAddress, this socket will bind to all interfaces on this node and the port will be selected by the operating system.

Parameters

parent the parent QObject object

Definition at line 61 of file k3serversocket.cpp.

KServerSocket::KServerSocket	(	const QString &	service,
		QObject *	parent = `nullptr`
	)

explicit

Construct this object specifying the service to listen on.

If the binding address isn't changed by setAddress, this socket will bind to all interfaces and will listen on the port specified by service. This is either a service name (e.g. 'www') or a port number (e.g. '80').

Parameters

service	the service name to listen on
parent	the parent QObject object

Definition at line 68 of file k3serversocket.cpp.

KServerSocket::KServerSocket	(	const QString &	node,
		const QString &	service,
		QObject *	parent = `nullptr`
	)

Construct this object specifying the node and service names to listen on.

If the binding address isn't changed by setAddress, this socket will bind to the interface specified by node and the port specified by service. This is either a service name (e.g. 'www') or a port number (e.g. '80').

Parameters

node	the node to bind to
service	the service port to listen on
parent	the parent QObject object

Definition at line 76 of file k3serversocket.cpp.

KServerSocket::~KServerSocket ( )

Destructor.

This will close the socket, if open.

Note, however, that accepted sockets do not get closed when this object closes.

Definition at line 85 of file k3serversocket.cpp.

Member Function Documentation

KStreamSocket * KServerSocket::accept ( )

overridevirtual

Accepts one incoming connection and return the associated, open socket.

If this function cannot accept a new connection, it will return NULL. The specific object class returned by this function may vary according to the implementation: derived classes may return specialized objects descended from KStreamSocket.

See also: KBufferedSocket; setAcceptBuffered

Implements KNetwork::KPassiveSocketBase.

Definition at line 293 of file k3serversocket.cpp.

bool KServerSocket::bind	(	const QString &	node,
		const QString &	service
	)

virtual

Binds this socket to the given nodename and service, or use the default ones if none are given.

Upon successful binding, the bound() signal will be emitted. If an error is found, the gotError() signal will be emitted.

This function returns true on success.

Parameters

node	the nodename
service	the service

Definition at line 202 of file k3serversocket.cpp.

bool KServerSocket::bind ( const QString & service )

virtual

Binds the socket to the given service name.

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

Parameters

service the service

Definition at line 208 of file k3serversocket.cpp.

bool KServerSocket::bind ( )

virtual

Binds the socket to the addresses previously set with setAddress().

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

Definition at line 214 of file k3serversocket.cpp.

bool KServerSocket::bind ( const KResolverEntry & address )

overridevirtual

Connect this socket to this specific address.

Reimplemented from KSocketBase.

Unlike bind(const QString&, const QString&) above, this function really does bind the socket. No lookup is performed. The bound() signal will be emitted.

Implements KNetwork::KPassiveSocketBase.

Definition at line 189 of file k3serversocket.cpp.

void KNetwork::KServerSocket::bound ( const KNetwork::KResolverEntry & local )

signal

This signal is emitted when the socket successfully binds to an address.

Parameters

local the local address we bound to

void KServerSocket::close ( )

overridevirtual

Closes this socket.

Implements KNetwork::KPassiveSocketBase.

Definition at line 278 of file k3serversocket.cpp.

void KNetwork::KServerSocket::closed ( )

signal

This signal is emitted when the socket completes the closing/shut down process.

void KServerSocket::copyError ( )

protected

Convenience function to set this object's error code to match that of the socket device.

Definition at line 381 of file k3serversocket.cpp.

KSocketAddress KServerSocket::externalAddress ( ) const

overridevirtual

Returns this socket's externally-visible address if know.

Implements KNetwork::KPassiveSocketBase.

Definition at line 352 of file k3serversocket.cpp.

void KNetwork::KServerSocket::gotError ( int code )

signal

This signal is emitted when this object finds an error.

The code parameter contains the error code that can also be found by calling error().

void KNetwork::KServerSocket::hostFound ( )

signal

This signal is emitted when the lookup is successfully completed.

bool KServerSocket::listen ( int backlog = 5 )

overridevirtual

Puts this socket into listening mode.

Reimplemented from KPassiveSocketBase.

Placing a socket into listening mode means it will be able to receive incoming connections through the accept() method.

If you do not call this method but call accept() directly, the socket will be placed into listening mode automatically.

Parameters

backlog the number of connection the system is to queue without accept() being called

Returns: true if the socket is now in listening mode.

Implements KNetwork::KPassiveSocketBase.

Definition at line 239 of file k3serversocket.cpp.

KSocketAddress KServerSocket::localAddress ( ) const

overridevirtual

Returns this socket's local address.

Implements KNetwork::KPassiveSocketBase.

Definition at line 347 of file k3serversocket.cpp.

bool KServerSocket::lookup ( )

virtual

Starts the lookup for peer and local hostnames as well as their services.

If the blocking mode for this object is on, this function will wait for the lookup results to be available (by calling the KResolver::wait() method on the resolver objects).

When the lookup is done, the signal hostFound() will be emitted (only once, even if we're doing a double lookup). If the lookup failed (for any of the two lookups) the gotError() signal will be emitted with the appropriate error condition (see KSocketBase::SocketError).

This function returns true on success and false on error. Note that this is not the lookup result!

Definition at line 149 of file k3serversocket.cpp.

void KNetwork::KServerSocket::readyAccept ( )

signal

This signal is emitted whenever the socket is ready for accepting – i.e., there is at least one connection waiting to be accepted.

KResolver & KServerSocket::resolver ( ) const

Returns the internal KResolver object used for looking up the host name and service.

This can be used to set extra options to the lookup process other than the default values, as well as obtaining the error codes in case of lookup failure.

Definition at line 100 of file k3serversocket.cpp.

const KResolverResults & KServerSocket::resolverResults ( ) const

Returns the internal list of resolved results for the binding address.

Definition at line 105 of file k3serversocket.cpp.

void KServerSocket::setAcceptBuffered ( bool enable )

Toggles whether the accepted socket will be buffered or not.

That is, the accept() function will always return a KStreamSocket object or descended from it. If buffering is enabled, the class to be returned will be KBufferedSocket.

By default, this flag is set to true.

Parameters

enable whether to set the accepted socket to buffered mode

Definition at line 288 of file k3serversocket.cpp.

void KServerSocket::setAddress ( const QString & service )

Sets the address on which we will listen.

The port to listen on is given by service, and we will bind to all interfaces. To let the operating system choose a port, set the service to "0". service can either be a service name (e.g. 'www') or a port number (e.g. '80').

Parameters

service the service name to listen on

Definition at line 124 of file k3serversocket.cpp.

void KServerSocket::setAddress	(	const QString &	node,
		const QString &	service
	)

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. Sets the address on which we will listen.

This will cause the socket to listen only on the interface given by node and on the port given by service. service can either be a service name (e.g. 'www') or a port number (e.g. '80').

Parameters

node	the node to bind to
service	the service port to listen on

Definition at line 134 of file k3serversocket.cpp.

void KServerSocket::setFamily ( int families )

Sets the allowed families for the resolutions.

Parameters

families the families that we want/accept

See also: KResolver::SocketFamilies for possible values

Definition at line 119 of file k3serversocket.cpp.

void KServerSocket::setResolutionEnabled ( bool enable )

Enables or disables name resolution.

If this flag is set to true, the bind() operation will trigger name lookup operations (i.e., converting a hostname into its binary form). If the flag is set to false, those operations will instead try to convert a string representation of an address without attempting name resolution.

This is useful, for instance, when IP addresses are in their string representation (such as "1.2.3.4") or come from other sources like KSocketAddress.

Parameters

enable whether to enable

Definition at line 110 of file k3serversocket.cpp.

bool KServerSocket::setSocketOptions ( int opts )

overrideprotectedvirtual

Sets the socket options.

Reimplemented from KSocketBase.

Reimplemented from KNetwork::KSocketBase.

Definition at line 91 of file k3serversocket.cpp.

void KServerSocket::setTimeout ( int msecs )

Sets the timeout for accepting.

When you call accept(), it will wait at most msecs milliseconds or return with an error (returning a NULL object).

Parameters

msecs the time in milliseconds to wait, 0 to wait forever

Definition at line 144 of file k3serversocket.cpp.

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

KDE's Doxygen guidelines are available online.

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KNetwork::KServerSocket

Signals

Public Member Functions

Protected Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation