KNetwork::KServerSocket

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KNetwork::KServerSocket Class Reference

#include <k3serversocket.h>

Inheritance diagram for KNetwork::KServerSocket:
Inheritance graph
[legend]

Signals

void bound (const KNetwork::KResolverEntry &local)
 
void closed ()
 
void gotError (int code)
 
void hostFound ()
 
void readyAccept ()
 

Public Member Functions

 KServerSocket (QObject *parent=nullptr)
 
 KServerSocket (const QString &service, QObject *parent=nullptr)
 
 KServerSocket (const QString &node, const QString &service, QObject *parent=nullptr)
 
 ~KServerSocket () override
 
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 const
 
QMetaObject::Connection connect (const QObject *sender, const char *signal, const char *method, Qt::ConnectionType type) const const
 
void deleteLater ()
 
void destroyed (QObject *obj)
 
bool disconnect (const char *signal, const QObject *receiver, const char *method) const const
 
bool disconnect (const QObject *receiver, const char *method) const const
 
void dumpObjectInfo ()
 
void dumpObjectInfo () const const
 
void dumpObjectTree ()
 
void dumpObjectTree () const const
 
QList< QByteArray > dynamicPropertyNames () const const
 
virtual bool event (QEvent *e)
 
virtual bool eventFilter (QObject *watched, QEvent *event)
 
T findChild (const QString &name, Qt::FindChildOptions options) const const
 
QList< T > findChildren (const QString &name, Qt::FindChildOptions options) const const
 
QList< T > findChildren (const QRegExp &regExp, Qt::FindChildOptions options) const const
 
QList< T > findChildren (const QRegularExpression &re, Qt::FindChildOptions options) const const
 
bool inherits (const char *className) const const
 
void installEventFilter (QObject *filterObj)
 
bool isWidgetType () const const
 
bool isWindowType () const const
 
void killTimer (int id)
 
virtual const QMetaObject * metaObject () const const
 
void moveToThread (QThread *targetThread)
 
QString objectName () const const
 
void objectNameChanged (const QString &objectName)
 
QObject * parent () const const
 
QVariant property (const char *name) const const
 
 Q_CLASSINFO (Name, Value)
 
 Q_DISABLE_COPY (Class)
 
 Q_DISABLE_COPY_MOVE (Class)
 
 Q_DISABLE_MOVE (Class)
 
 Q_EMIT Q_EMIT
 
 Q_ENUM (...)
 
 Q_ENUM_NS (...)
 
 Q_ENUMS (...)
 
 Q_FLAG (...)
 
 Q_FLAG_NS (...)
 
 Q_FLAGS (...)
 
 Q_GADGET Q_GADGET
 
 Q_INTERFACES (...)
 
 Q_INVOKABLE Q_INVOKABLE
 
 Q_NAMESPACE Q_NAMESPACE
 
 Q_NAMESPACE_EXPORT (EXPORT_MACRO)
 
 Q_OBJECT Q_OBJECT
 
 Q_PROPERTY (...)
 
 Q_REVISION Q_REVISION
 
 Q_SET_OBJECT_NAME (Object)
 
 Q_SIGNAL Q_SIGNAL
 
 Q_SIGNALS Q_SIGNALS
 
 Q_SLOT Q_SLOT
 
 Q_SLOTS Q_SLOTS
 
T qFindChild (const QObject *obj, const QString &name)
 
QList< T > qFindChildren (const QObject *obj, const QRegExp &regExp)
 
QList< T > qFindChildren (const QObject *obj, const QString &name)
 
T qobject_cast (QObject *object)
 
T qobject_cast (const QObject *object)
 
 QT_NO_NARROWING_CONVERSIONS_IN_CONNECT QT_NO_NARROWING_CONVERSIONS_IN_CONNECT
 
void removeEventFilter (QObject *obj)
 
void setObjectName (const QString &name)
 
void setParent (QObject *parent)
 
bool setProperty (const char *name, const QVariant &value)
 
bool signalsBlocked () const const
 
int startTimer (int interval, Qt::TimerType timerType)
 
int startTimer (std::chrono::milliseconds time, Qt::TimerType timerType)
 
QThread * thread () const const
 
- Public Member Functions inherited from KNetwork::KPassiveSocketBase
 KPassiveSocketBase ()
 
 ~KPassiveSocketBase () override
 
- 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 const
 
int receivers (const char *signal) const const
 
QObject * sender () const const
 
int senderSignalIndex () const 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)
 
- Public Attributes inherited from QObject
typedef QObjectList
 

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
parentthe parent QObject object

Definition at line 60 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').

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.

Parameters
servicethe service name to listen on
parentthe parent QObject object

Definition at line 67 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').

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.

Parameters
nodethe node to bind to
servicethe service port to listen on
parentthe parent QObject object

Definition at line 75 of file k3serversocket.cpp.

KServerSocket::~KServerSocket ( )
override

Destructor.

This will close the socket, if open.

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

Definition at line 84 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 292 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
nodethe nodename
servicethe service

Definition at line 201 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
servicethe service

Definition at line 207 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 213 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 188 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
localthe local address we bound to
void KServerSocket::close ( )
overridevirtual

Closes this socket.

Implements KNetwork::KPassiveSocketBase.

Definition at line 277 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 380 of file k3serversocket.cpp.

KSocketAddress KServerSocket::externalAddress ( ) const
overridevirtual

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

Implements KNetwork::KPassiveSocketBase.

Definition at line 351 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
backlogthe 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 238 of file k3serversocket.cpp.

KSocketAddress KServerSocket::localAddress ( ) const
overridevirtual

Returns this socket's local address.

Implements KNetwork::KPassiveSocketBase.

Definition at line 346 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 148 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 99 of file k3serversocket.cpp.

const KResolverResults & KServerSocket::resolverResults ( ) const

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

Definition at line 104 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
enablewhether to set the accepted socket to buffered mode

Definition at line 287 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').

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.

Parameters
servicethe service name to listen on

Definition at line 123 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').

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.

Parameters
nodethe node to bind to
servicethe service port to listen on

Definition at line 133 of file k3serversocket.cpp.

void KServerSocket::setFamily ( int  families)

Sets the allowed families for the resolutions.

Parameters
familiesthe families that we want/accept
See also
KResolver::SocketFamilies for possible values

Definition at line 118 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
enablewhether to enable

Definition at line 109 of file k3serversocket.cpp.

bool KServerSocket::setSocketOptions ( int  opts)
overrideprotectedvirtual

Sets the socket options.

Reimplemented from KSocketBase.

Reimplemented from KNetwork::KSocketBase.

Definition at line 90 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
msecsthe time in milliseconds to wait, 0 to wait forever

Definition at line 143 of file k3serversocket.cpp.

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