The QDnsLookup class represents a DNS lookup. More...

#include <qdnslookup.h>

Inheritance diagram for QDnsLookup:

Collaboration diagram for QDnsLookup:

Public Types
enum	Error { NoError = 0 , ResolverError , OperationCancelledError , InvalidRequestError , InvalidReplyError , ServerFailureError , ServerRefusedError , NotFoundError , TimeoutError }
	Indicates all possible error conditions found during the processing of the DNS lookup. More...

enum	Type { A = 1 , AAAA = 28 , ANY = 255 , CNAME = 5 , MX = 15 , NS = 2 , PTR = 12 , SRV = 33 , TXT = 16 }
	Indicates the type of DNS lookup that was performed. More...

Public Slots
void	abort ()
	Aborts the DNS lookup operation.

void	lookup ()
	Performs the DNS lookup.

Public Slots inherited from QObject
void	deleteLater ()
	\threadsafe

Signals
void	finished ()
	This signal is emitted when the reply has finished processing.

void	nameChanged (const QString &name)
	This signal is emitted when the lookup \l name changes.

void	typeChanged (Type type)
	This signal is emitted when the lookup \l type changes.

void	nameserverChanged (const QHostAddress &nameserver)

void	nameserverPortChanged (quint16 port)

Signals inherited from QObject
void	destroyed (QObject *=nullptr)
	This signal is emitted immediately before the object obj is destroyed, after any instances of QPointer have been notified, and cannot be blocked.

void	objectNameChanged (const QString &objectName, QPrivateSignal)
	This signal is emitted after the object's name has been changed.

Public Member Functions
	QDnsLookup (QObject *parent=nullptr)
	Constructs a QDnsLookup object and sets parent as the parent object.

	QDnsLookup (Type type, const QString &name, QObject *parent=nullptr)
	Constructs a QDnsLookup object for the given type and name and sets parent as the parent object.

	QDnsLookup (Type type, const QString &name, const QHostAddress &nameserver, QObject *parent=nullptr)

	QDnsLookup (Type type, const QString &name, const QHostAddress &nameserver, quint16 port, QObject *parent=nullptr)

	~QDnsLookup ()
	Destroys the QDnsLookup object.

Error	error () const

QString	errorString () const

bool	isFinished () const
	Returns whether the reply has finished or was aborted.

QString	name () const

void	setName (const QString &name)

QBindable< QString >	bindableName ()

Type	type () const

void	setType (QDnsLookup::Type)

QBindable< Type >	bindableType ()

QHostAddress	nameserver () const

void	setNameserver (const QHostAddress &nameserver)

QBindable< QHostAddress >	bindableNameserver ()

quint16	nameserverPort () const

void	setNameserverPort (quint16 port)

QBindable< quint16 >	bindableNameserverPort ()

void	setNameserver (const QHostAddress &nameserver, quint16 port)

QList< QDnsDomainNameRecord >	canonicalNameRecords () const
	Returns the list of canonical name records associated with this lookup.

QList< QDnsHostAddressRecord >	hostAddressRecords () const
	Returns the list of host address records associated with this lookup.

QList< QDnsMailExchangeRecord >	mailExchangeRecords () const
	Returns the list of mail exchange records associated with this lookup.

QList< QDnsDomainNameRecord >	nameServerRecords () const
	Returns the list of name server records associated with this lookup.

QList< QDnsDomainNameRecord >	pointerRecords () const
	Returns the list of pointer records associated with this lookup.

QList< QDnsServiceRecord >	serviceRecords () const
	Returns the list of service records associated with this lookup.

QList< QDnsTextRecord >	textRecords () const
	Returns the list of text records associated with this lookup.

Public Member Functions inherited from QObject
Q_INVOKABLE	QObject (QObject *parent=nullptr)
	Constructs an object with parent object parent.

virtual	~QObject ()
	Destroys the object, deleting all its child objects.

virtual bool	event (QEvent *event)
	This virtual function receives events to an object and should return true if the event e was recognized and processed.

virtual bool	eventFilter (QObject watched, QEvent event)
	Filters events if this object has been installed as an event filter for the watched object.

QString	objectName () const

Q_WEAK_OVERLOAD void	setObjectName (const QString &name)
	Sets the object's name to name.

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

QBindable< QString >	bindableObjectName ()

bool	isWidgetType () const
	Returns `true` if the object is a widget; otherwise returns `false`.

bool	isWindowType () const
	Returns `true` if the object is a window; otherwise returns `false`.

bool	isQuickItemType () const
	Returns `true` if the object is a QQuickItem; otherwise returns `false`.

bool	signalsBlocked () const noexcept
	Returns `true` if signals are blocked; otherwise returns `false`.

bool	blockSignals (bool b) noexcept
	If block is true, signals emitted by this object are blocked (i.e., emitting a signal will not invoke anything connected to it).

QThread *	thread () const
	Returns the thread in which the object lives.

void	moveToThread (QThread *thread)
	Changes the thread affinity for this object and its children.

int	startTimer (int interval, Qt::TimerType timerType=Qt::CoarseTimer)
	This is an overloaded function that will start a timer of type timerType and a timeout of interval milliseconds.

int	startTimer (std::chrono::milliseconds time, Qt::TimerType timerType=Qt::CoarseTimer)

void	killTimer (int id)
	Kills the timer with timer identifier, id.

template<typename T >
T	findChild (const QString &aName=QString(), Qt::FindChildOptions options=Qt::FindChildrenRecursively) const
	Returns the child of this object that can be cast into type T and that is called name, or \nullptr if there is no such object.

template<typename T >
QList< T >	findChildren (const QString &aName, Qt::FindChildOptions options=Qt::FindChildrenRecursively) const
	Returns all children of this object with the given name that can be cast to type T, or an empty list if there are no such objects.

template<typename T >
QList< T >	findChildren (Qt::FindChildOptions options=Qt::FindChildrenRecursively) const
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

const QObjectList &	children () const
	Returns a list of child objects.

void	setParent (QObject *parent)
	Makes the object a child of parent.

void	installEventFilter (QObject *filterObj)
	Installs an event filter filterObj on this object.

void	removeEventFilter (QObject *obj)
	Removes an event filter object obj from this object.

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

bool	disconnect (const char signal=nullptr, const QObject receiver=nullptr, const char *member=nullptr) const

bool	disconnect (const QObject receiver, const char member=nullptr) const

void	dumpObjectTree () const
	Dumps a tree of children to the debug output.

void	dumpObjectInfo () const
	Dumps information about signal connections, etc.

bool	setProperty (const char *name, const QVariant &value)
	Sets the value of the object's name property to value.

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

QVariant	property (const char *name) const
	Returns the value of the object's name property.

QList< QByteArray >	dynamicPropertyNames () const

QBindingStorage *	bindingStorage ()

const QBindingStorage *	bindingStorage () const

QObject *	parent () const
	Returns a pointer to the parent object.

bool	inherits (const char *classname) const
	Returns `true` if this object is an instance of a class that inherits className or a QObject subclass that inherits className; otherwise returns `false`.

Properties
Error	error
	the type of error that occurred if the DNS lookup failed, or NoError.

QString	errorString
	a human-readable description of the error if the DNS lookup failed.

QString	name
	the name to lookup.

Type	type
	the type of DNS lookup.

QHostAddress	nameserver
	the nameserver to use for DNS lookup.

quint16	nameserverPort
	the port number of nameserver to use for DNS lookup.

Properties inherited from QObject
QString	objectName
	the name of this object

Additional Inherited Members
Static Public Member Functions inherited from QObject
static QMetaObject::Connection	connect (const QObject sender, const char signal, const QObject receiver, const char member, Qt::ConnectionType=Qt::AutoConnection)
	\threadsafe

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

template<typename Func1 , typename Func2 >
static QMetaObject::Connection	connect (const typename QtPrivate::FunctionPointer< Func1 >::Object sender, Func1 signal, const typename QtPrivate::ContextTypeForFunctor< Func2 >::ContextType context, Func2 &&slot, Qt::ConnectionType type=Qt::AutoConnection)

template<typename Func1 , typename Func2 >
static QMetaObject::Connection	connect (const typename QtPrivate::FunctionPointer< Func1 >::Object *sender, Func1 signal, Func2 &&slot)

static bool	disconnect (const QObject sender, const char signal, const QObject receiver, const char member)
	\threadsafe

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

static bool	disconnect (const QMetaObject::Connection &)
	Disconnect a connection.

template<typename Func1 , typename Func2 >
static bool	disconnect (const typename QtPrivate::FunctionPointer< Func1 >::Object sender, Func1 signal, const typename QtPrivate::FunctionPointer< Func2 >::Object receiver, Func2 slot)

template<typename Func1 >
static bool	disconnect (const typename QtPrivate::FunctionPointer< Func1 >::Object sender, Func1 signal, const QObject receiver, void **zero)

Protected Member Functions inherited from QObject
QObject *	sender () const
	Returns a pointer to the object that sent the signal, if called in a slot activated by a signal; otherwise it returns \nullptr.

int	senderSignalIndex () const

int	receivers (const char *signal) const
	Returns the number of receivers connected to the signal.

bool	isSignalConnected (const QMetaMethod &signal) const

virtual void	timerEvent (QTimerEvent *event)
	This event handler can be reimplemented in a subclass to receive timer events for the object.

virtual void	childEvent (QChildEvent *event)
	This event handler can be reimplemented in a subclass to receive child events.

virtual void	customEvent (QEvent *event)
	This event handler can be reimplemented in a subclass to receive custom events.

virtual void	connectNotify (const QMetaMethod &signal)

virtual void	disconnectNotify (const QMetaMethod &signal)

	QObject (QObjectPrivate &dd, QObject *parent=nullptr)

Protected Attributes inherited from QObject
QScopedPointer< QObjectData >	d_ptr

Related Symbols inherited from QObject
template< class T > T	qobject_cast (const QObject *object)
	Returns the given object cast to type T if the object is of type T (or of a subclass); otherwise returns \nullptr.

template< typename T > T	qFindChildqFindChildren (const QObject *obj, const QString &name)()

template< typename T > QList< T >	qFindChildrenqFindChildren (const QObject *obj, const QString &name)()

	QObjectList
	\macro Q_CLASSINFO(Name, Value)

Detailed Description

The QDnsLookup class represents a DNS lookup.

Since: 5.0

\inmodule QtNetwork

QDnsLookup uses the mechanisms provided by the operating system to perform DNS lookups. To perform a lookup you need to specify a \l name and \l type then invoke the \l{QDnsLookup::lookup()}{lookup()} slot. The \l{QDnsLookup::finished()}{finished()} signal will be emitted upon completion.

For example, you can determine which servers an XMPP chat client should connect to for a given domain with:

void MyObject::lookupServers()
{
    // Create a DNS lookup.
    dns = new QDnsLookup(this);
    connect(dns, &QDnsLookup::finished, this, &MyObject::handleServers);
 
    // Find the XMPP servers for gmail.com
    dns->setType(QDnsLookup::SRV);
    dns->setName("_xmpp-client._tcp.gmail.com");
    dns->lookup();
}

Once the request finishes you can handle the results with:

void MyObject::handleServers()
{
    // Check the lookup succeeded.
    if (dns->error() != QDnsLookup::NoError) {
        qWarning("DNS lookup failed");
        dns->deleteLater();
        return;
    }
 
    // Handle the results.
    const auto records = dns->serviceRecords();
    for (const QDnsServiceRecord &record : records) {
        ...
    }
    dns->deleteLater();
}

Note: If you simply want to find the IP address(es) associated with a host name, or the host name associated with an IP address you should use QHostInfo instead.

Definition at line 140 of file qdnslookup.h.

Member Enumeration Documentation

◆ Error

enum QDnsLookup::Error

Indicates all possible error conditions found during the processing of the DNS lookup.

\value NoError no error condition.

\value ResolverError there was an error initializing the system's DNS resolver.

\value OperationCancelledError the lookup was aborted using the abort() method.

\value InvalidRequestError the requested DNS lookup was invalid.

\value InvalidReplyError the reply returned by the server was invalid.

\value ServerFailureError the server encountered an internal failure while processing the request (SERVFAIL).

\value ServerRefusedError the server refused to process the request for security or policy reasons (REFUSED).

\value NotFoundError the requested domain name does not exist (NXDOMAIN).

\value TimeoutError the server was not reached or did not reply in time (since 6.6).

Enumerator
NoError
ResolverError
OperationCancelledError
InvalidRequestError
InvalidReplyError
ServerFailureError
ServerRefusedError
NotFoundError
TimeoutError

Definition at line 153 of file qdnslookup.h.

◆ Type

enum QDnsLookup::Type

Indicates the type of DNS lookup that was performed.

\value A IPv4 address records.

\value AAAA IPv6 address records.

\value ANY any records.

\value CNAME canonical name records.

\value MX mail exchange records.

\value NS name server records.

\value PTR pointer records.

\value SRV service records.

\value TXT text records.

Enumerator
A
AAAA
ANY
CNAME
MX
NS
PTR
SRV
TXT

Definition at line 167 of file qdnslookup.h.

Constructor & Destructor Documentation

◆ QDnsLookup() [1/4]

QDnsLookup::QDnsLookup ( QObject * parent = nullptr )

explicit

Constructs a QDnsLookup object and sets parent as the parent object.

The \l type property will default to QDnsLookup::A.

Definition at line 245 of file qdnslookup.cpp.

◆ QDnsLookup() [2/4]

QDnsLookup::QDnsLookup	(	Type	type,
		const QString &	name,
		QObject *	parent = `nullptr`
	)

Constructs a QDnsLookup object for the given type and name and sets parent as the parent object.

Definition at line 255 of file qdnslookup.cpp.

References d, name, and type.

◆ QDnsLookup() [3/4]

QDnsLookup::QDnsLookup	(	Type	type,
		const QString &	name,
		const QHostAddress &	nameserver,
		QObject *	parent = `nullptr`
	)

Since: 5.4

Constructs a QDnsLookup object to issue a query for name of record type type, using the DNS server nameserver running on the default DNS port, and sets parent as the parent object.

Definition at line 272 of file qdnslookup.cpp.

◆ QDnsLookup() [4/4]

QDnsLookup::QDnsLookup	(	Type	type,
		const QString &	name,
		const QHostAddress &	nameserver,
		quint16	port,
		QObject *	parent = `nullptr`
	)

\fn QDnsLookup::QDnsLookup(Type type, const QString &name, const QHostAddress &nameserver, quint16 port, QObject *parent)
\since 6.6

Constructs a QDnsLookup object to issue a query for \a name of record type
\a type, using the DNS server \a nameserver running on port \a port, and
sets \a parent as the parent object.

! [nameserver-port]

Note: Setting the port number to any value other than the default (53) can cause the name resolution to fail, depending on the operating system limitations and firewalls. Notably, the Windows API used by QDnsLookup is unable to handle alternate port numbers. ! [nameserver-port]

Definition at line 292 of file qdnslookup.cpp.

References d, name, nameserver, and type.

◆ ~QDnsLookup()

QDnsLookup::~QDnsLookup ( )

Destroys the QDnsLookup object.

It is safe to delete a QDnsLookup object even if it is not finished, you will simply never receive its results.

Definition at line 309 of file qdnslookup.cpp.

Member Function Documentation

◆ abort

void QDnsLookup::abort ( )

slot

Aborts the DNS lookup operation.

If the lookup is already finished, does nothing.

Definition at line 532 of file qdnslookup.cpp.

References d, emit, finished(), OperationCancelledError, and tr.

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◆ bindableName()

QBindable< QString > QDnsLookup::bindableName ( )

Definition at line 365 of file qdnslookup.cpp.

References d.

◆ bindableNameserver()

QBindable< QHostAddress > QDnsLookup::bindableNameserver ( )

Definition at line 409 of file qdnslookup.cpp.

References d.

◆ bindableNameserverPort()

QBindable< quint16 > QDnsLookup::bindableNameserverPort ( )

Definition at line 433 of file qdnslookup.cpp.

References d.

◆ bindableType()

QBindable< QDnsLookup::Type > QDnsLookup::bindableType ( )

Definition at line 387 of file qdnslookup.cpp.

References d.

◆ canonicalNameRecords()

QList< QDnsDomainNameRecord > QDnsLookup::canonicalNameRecords ( ) const

Returns the list of canonical name records associated with this lookup.

Definition at line 459 of file qdnslookup.cpp.

◆ error()

QDnsLookup::Error QDnsLookup::error ( ) const

Definition at line 318 of file qdnslookup.cpp.

◆ errorString()

QString QDnsLookup::errorString ( ) const

Definition at line 328 of file qdnslookup.cpp.

◆ finished

void QDnsLookup::finished ( )

signal

This signal is emitted when the reply has finished processing.

Referenced by abort(), and lookup().

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◆ hostAddressRecords()

QList< QDnsHostAddressRecord > QDnsLookup::hostAddressRecords ( ) const

Returns the list of host address records associated with this lookup.

Definition at line 468 of file qdnslookup.cpp.

◆ isFinished()

bool QDnsLookup::isFinished ( ) const

Returns whether the reply has finished or was aborted.

Definition at line 337 of file qdnslookup.cpp.

◆ lookup

void QDnsLookup::lookup ( )

slot

Performs the DNS lookup.

The \l{QDnsLookup::finished()}{finished()} signal is emitted upon completion.

Definition at line 551 of file qdnslookup.cpp.

References Qt::BlockingQueuedConnection, QObject::connect(), d, emit, QNetworkReply::error(), QIODevice::errorString(), finished(), QDnsLookupRunnable::finished(), QCoreApplication::instance(), qDebug, qPrintable, qWarning, reply, and QObject::sender().

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◆ mailExchangeRecords()

QList< QDnsMailExchangeRecord > QDnsLookup::mailExchangeRecords ( ) const

Returns the list of mail exchange records associated with this lookup.

The records are sorted according to \l{http://www.rfc-editor.org/rfc/rfc5321.txt}{RFC 5321}, so if you use them to connect to servers, you should try them in the order they are listed.

Definition at line 481 of file qdnslookup.cpp.

◆ name()

QString QDnsLookup::name ( ) const

Definition at line 354 of file qdnslookup.cpp.

◆ nameChanged

void QDnsLookup::nameChanged ( const QString & name )

signal

This signal is emitted when the lookup \l name changes.

name is the new lookup name.

◆ nameserver()

QHostAddress QDnsLookup::nameserver ( ) const

Definition at line 398 of file qdnslookup.cpp.

◆ nameserverChanged

void QDnsLookup::nameserverChanged ( const QHostAddress & nameserver )

signal

◆ nameserverPort()

quint16 QDnsLookup::nameserverPort ( ) const

Definition at line 422 of file qdnslookup.cpp.

◆ nameserverPortChanged

void QDnsLookup::nameserverPortChanged ( quint16 port )

signal

◆ nameServerRecords()

QList< QDnsDomainNameRecord > QDnsLookup::nameServerRecords ( ) const

Returns the list of name server records associated with this lookup.

Definition at line 490 of file qdnslookup.cpp.

◆ pointerRecords()

QList< QDnsDomainNameRecord > QDnsLookup::pointerRecords ( ) const

Returns the list of pointer records associated with this lookup.

Definition at line 499 of file qdnslookup.cpp.

◆ serviceRecords()

QList< QDnsServiceRecord > QDnsLookup::serviceRecords ( ) const

Returns the list of service records associated with this lookup.

The records are sorted according to \l{http://www.rfc-editor.org/rfc/rfc2782.txt}{RFC 2782}, so if you use them to connect to servers, you should try them in the order they are listed.

Definition at line 512 of file qdnslookup.cpp.

◆ setName()

void QDnsLookup::setName ( const QString & name )

Definition at line 359 of file qdnslookup.cpp.

References d, and name.

◆ setNameserver() [1/2]

void QDnsLookup::setNameserver ( const QHostAddress & nameserver )

Definition at line 403 of file qdnslookup.cpp.

References d, and nameserver.

Referenced by setNameserver().

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◆ setNameserver() [2/2]

void QDnsLookup::setNameserver	(	const QHostAddress &	nameserver,
		quint16	port
	)

Since: 6.6 Sets the nameserver to nameserver and the port to port.

nameserver-port

See also: QDnsLookup::nameserver, QDnsLookup::nameserverPort

Definition at line 447 of file qdnslookup.cpp.

References Qt::beginPropertyUpdateGroup(), Qt::endPropertyUpdateGroup(), nameserver, setNameserver(), and setNameserverPort().

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◆ setNameserverPort()

void QDnsLookup::setNameserverPort ( quint16 port )

Definition at line 427 of file qdnslookup.cpp.

References d, and nameserverPort.

Referenced by setNameserver().

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◆ setType()

void QDnsLookup::setType ( QDnsLookup::Type )

Definition at line 381 of file qdnslookup.cpp.

References d, and type.

◆ textRecords()

QList< QDnsTextRecord > QDnsLookup::textRecords ( ) const

Returns the list of text records associated with this lookup.

Definition at line 521 of file qdnslookup.cpp.

◆ type()

QDnsLookup::Type QDnsLookup::type ( ) const

Definition at line 376 of file qdnslookup.cpp.

◆ typeChanged

void QDnsLookup::typeChanged ( Type type )

signal

This signal is emitted when the lookup \l type changes.

type is the new lookup type.

Property Documentation

◆ error

QDnsLookup::error

read

the type of error that occurred if the DNS lookup failed, or NoError.

Definition at line 135 of file qdnslookup.h.

◆ errorString

QDnsLookup::errorString

read

a human-readable description of the error if the DNS lookup failed.

Definition at line 135 of file qdnslookup.h.

◆ name

QDnsLookup::name

readwrite

the name to lookup.

If the name to look up is empty, QDnsLookup will attempt to resolve the root domain of DNS. That query is usually performed with QDnsLookup::type set to \l{QDnsLookup::Type}{NS}.

Note: The name will be encoded using IDNA, which means it's unsuitable for querying SRV records compatible with the DNS-SD specification.

Definition at line 135 of file qdnslookup.h.

Referenced by QDnsLookup(), QDnsLookup(), and setName().

◆ nameserver

QDnsLookup::nameserver

readwrite

the nameserver to use for DNS lookup.

Definition at line 135 of file qdnslookup.h.

Referenced by QDnsLookup(), setNameserver(), and setNameserver().

◆ nameserverPort

QDnsLookup::nameserverPort

readwrite

the port number of nameserver to use for DNS lookup.

Since: 6.6
nameserver-port

Definition at line 135 of file qdnslookup.h.

Referenced by setNameserverPort().

◆ type

QDnsLookup::type

readwrite

the type of DNS lookup.

Definition at line 135 of file qdnslookup.h.

Referenced by QDnsLookup(), QDnsLookup(), and setType().

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

qtbase/src/network/kernel/qdnslookup.h
qtbase/src/network/kernel/qdnslookup.cpp

Public Types

Public Slots

Signals

Public Member Functions

Properties

Additional Inherited Members

Detailed Description

Member Enumeration Documentation

◆ Error

◆ Type

Constructor & Destructor Documentation

◆ QDnsLookup() [1/4]

◆ QDnsLookup() [2/4]

◆ QDnsLookup() [3/4]

◆ QDnsLookup() [4/4]

◆ ~QDnsLookup()

Member Function Documentation

◆ abort

◆ bindableName()

◆ bindableNameserver()

◆ bindableNameserverPort()

◆ bindableType()

◆ canonicalNameRecords()

◆ error()

◆ errorString()

◆ finished

◆ hostAddressRecords()

◆ isFinished()

◆ lookup

◆ mailExchangeRecords()

◆ name()

◆ nameChanged

◆ nameserver()

◆ nameserverChanged

◆ nameserverPort()

◆ nameserverPortChanged

◆ nameServerRecords()

◆ pointerRecords()

◆ serviceRecords()

◆ setName()

◆ setNameserver() [1/2]

◆ setNameserver() [2/2]

◆ setNameserverPort()

◆ setType()

◆ textRecords()

◆ type()

◆ typeChanged

Property Documentation

◆ error

◆ errorString

◆ name

◆ nameserver

◆ nameserverPort

◆ type