QHostInfoAgent Class Reference

#include <qhostinfo_p.h>

Inheritance diagram for QHostInfoAgent:

Static Public Functions
static QHostInfo	fromName (const QString &hostName)
static QHostInfo	fromName (const QString &hostName, QSharedPointer< QNetworkSession > networkSession)
Static Public Functions inherited from QObject
static bool	connect (const QObject *sender, const char *signal, const QObject *receiver, const char *member, Qt::ConnectionType=Qt::AutoConnection)
	Creates a connection of the given type from the signal in the sender object to the method in the receiver object. More...
static bool	connect (const QObject *sender, const QMetaMethod &signal, const QObject *receiver, const QMetaMethod &method, Qt::ConnectionType type=Qt::AutoConnection)
static bool	disconnect (const QObject *sender, const char *signal, const QObject *receiver, const char *member)
	Disconnects signal in object sender from method in object receiver. More...
static bool	disconnect (const QObject *sender, const QMetaMethod &signal, const QObject *receiver, const QMetaMethod &member)
static uint	registerUserData ()
static QString	tr (const char *sourceText, const char *comment=0, int n=-1)
static QString	trUtf8 (const char *sourceText, const char *comment=0, int n=-1)

Additional Inherited Members
Public Slots inherited from QObject
void	deleteLater ()
	Schedules this object for deletion. More...
Signals inherited from QObject
void	destroyed (QObject *=0)
	This signal is emitted immediately before the object obj is destroyed, and can not be blocked. More...
Public Functions inherited from QObject
bool	blockSignals (bool b)
	If block is true, signals emitted by this object are blocked (i.e., emitting a signal will not invoke anything connected to it). More...
const QObjectList &	children () const
	Returns a list of child objects. More...
bool	connect (const QObject *sender, const char *signal, const char *member, Qt::ConnectionType type=Qt::AutoConnection) const
bool	disconnect (const char *signal=0, const QObject *receiver=0, const char *member=0)
bool	disconnect (const QObject *receiver, const char *member=0)
void	dumpObjectInfo ()
	Dumps information about signal connections, etc. More...
void	dumpObjectTree ()
	Dumps a tree of children to the debug output. More...
QList< QByteArray >	dynamicPropertyNames () const
	Returns the names of all properties that were dynamically added to the object using setProperty(). More...
virtual bool	event (QEvent *)
	This virtual function receives events to an object and should return true if the event e was recognized and processed. More...
virtual bool	eventFilter (QObject *, QEvent *)
	Filters events if this object has been installed as an event filter for the watched object. More...
template<typename T >
T	findChild (const QString &aName=QString()) const
	Returns the child of this object that can be cast into type T and that is called name, or 0 if there is no such object. More...
template<typename T >
QList< T >	findChildren (const QString &aName=QString()) 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. More...
template<typename T >
QList< T >	findChildren (const QRegExp &re) const
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. More...
void	installEventFilter (QObject *)
	Installs an event filter filterObj on this object. More...
bool	isWidgetType () const
	Returns true if the object is a widget; otherwise returns false. More...
void	killTimer (int id)
	Kills the timer with timer identifier, id. More...
virtual const QMetaObject *	metaObject () const
	Returns a pointer to the meta-object of this object. More...
void	moveToThread (QThread *thread)
	Changes the thread affinity for this object and its children. More...
QString	objectName () const
QObject *	parent () const
	Returns a pointer to the parent object. More...
QVariant	property (const char *name) const
	Returns the value of the object's name property. More...
Q_INVOKABLE	QObject (QObject *parent=0)
	Constructs an object with parent object parent. More...
void	removeEventFilter (QObject *)
	Removes an event filter object obj from this object. More...
void	setObjectName (const QString &name)
void	setParent (QObject *)
	Makes the object a child of parent. More...
bool	setProperty (const char *name, const QVariant &value)
	Sets the value of the object's name property to value. More...
void	setUserData (uint id, QObjectUserData *data)
bool	signalsBlocked () const
	Returns true if signals are blocked; otherwise returns false. More...
int	startTimer (int interval)
	Starts a timer and returns a timer identifier, or returns zero if it could not start a timer. More...
QThread *	thread () const
	Returns the thread in which the object lives. More...
QObjectUserData *	userData (uint id) const
virtual	~QObject ()
	Destroys the object, deleting all its child objects. More...
Static Public Variables inherited from QObject
static const QMetaObject	staticMetaObject
	This variable stores the meta-object for the class. More...
Protected Functions inherited from QObject
virtual void	childEvent (QChildEvent *)
	This event handler can be reimplemented in a subclass to receive child events. More...
virtual void	connectNotify (const char *signal)
	This virtual function is called when something has been connected to signal in this object. More...
virtual void	customEvent (QEvent *)
	This event handler can be reimplemented in a subclass to receive custom events. More...
virtual void	disconnectNotify (const char *signal)
	This virtual function is called when something has been disconnected from signal in this object. More...
	QObject (QObjectPrivate &dd, QObject *parent=0)
int	receivers (const char *signal) const
	Returns the number of receivers connected to the signal. More...
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 0. More...
int	senderSignalIndex () const
virtual void	timerEvent (QTimerEvent *)
	This event handler can be reimplemented in a subclass to receive timer events for the object. More...
Protected Variables inherited from QObject
QScopedPointer< QObjectData >	d_ptr
Static Protected Variables inherited from QObject
static const QMetaObject	staticQtMetaObject
Related Functions inherited from QObject
T	qFindChildqFindChildren (const QObject *obj, const QString &name)()
QList< T >	qFindChildrenqFindChildren (const QObject *obj, const QString &name)()
QList< T >	qFindChildrenqFindChildren (const QObject *obj, const QRegExp &regExp)()
T *	qobject_cast (QObject *object)
	QObjectList
void *	qt_find_obj_child (QObject *parent, const char *type, const QString &name)
	Returns a pointer to the object named name that inherits type and with a given parent. More...

Detailed Description

Definition at line 99 of file qhostinfo_p.h.

Functions

fromName() [1/2]

QHostInfo QHostInfoAgent::fromName ( const QString &  hostName )

static

Definition at line 124 of file qhostinfo_unix.cpp.

Referenced by QHostInfo::fromName(), fromName(), QHostInfoPrivate::fromName(), QHostInfoRunnable::run(), and translateWSAError().

{
    QHostInfo results;

#if defined(QHOSTINFO_DEBUG)
    qDebug("QHostInfoAgent::fromName(%s) looking up...",
           hostName.toLatin1().constData());
#endif

    // Load res_init on demand.
    static volatile bool triedResolve = false;
    if (!triedResolve) {
        QMutexLocker locker(QMutexPool::globalInstanceGet(&local_res_init));
        if (!triedResolve) {
            resolveLibrary();
            triedResolve = true;
        }
    }

    // If res_init is available, poll it.
    if (local_res_init)
        local_res_init();

    QHostAddress address;
    if (address.setAddress(hostName)) {
        // Reverse lookup
// Reverse lookups using getnameinfo are broken on darwin, use gethostbyaddr instead.
#if !defined (QT_NO_GETADDRINFO) && !defined (Q_OS_DARWIN)
        sockaddr_in sa4;
#ifndef QT_NO_IPV6
        sockaddr_in6 sa6;
#endif
        sockaddr *sa = 0;
        QT_SOCKLEN_T saSize = 0;
        if (address.protocol() == QAbstractSocket::IPv4Protocol) {
            sa = (sockaddr *)&sa4;
            saSize = sizeof(sa4);
            memset(&sa4, 0, sizeof(sa4));
            sa4.sin_family = AF_INET;
            sa4.sin_addr.s_addr = htonl(address.toIPv4Address());
        }
#ifndef QT_NO_IPV6
        else {
            sa = (sockaddr *)&sa6;
            saSize = sizeof(sa6);
            memset(&sa6, 0, sizeof(sa6));
            sa6.sin6_family = AF_INET6;
            memcpy(sa6.sin6_addr.s6_addr, address.toIPv6Address().c, sizeof(sa6.sin6_addr.s6_addr));
        }
#endif

        char hbuf[NI_MAXHOST];
        if (sa && getnameinfo(sa, saSize, hbuf, sizeof(hbuf), 0, 0, 0) == 0)
            results.setHostName(QString::fromLatin1(hbuf));
#else
        in_addr_t inetaddr = qt_safe_inet_addr(hostName.toLatin1().constData());
        struct hostent *ent = gethostbyaddr((const char *)&inetaddr, sizeof(inetaddr), AF_INET);
        if (ent)
            results.setHostName(QString::fromLatin1(ent->h_name));
#endif

        if (results.hostName().isEmpty())
            results.setHostName(address.toString());
        results.setAddresses(QList<QHostAddress>() << address);
        return results;
    }

    // IDN support
    QByteArray aceHostname = QUrl::toAce(hostName);
    results.setHostName(hostName);
    if (aceHostname.isEmpty()) {
        results.setError(QHostInfo::HostNotFound);
        results.setErrorString(hostName.isEmpty() ?
                               QCoreApplication::translate("QHostInfoAgent", "No host name given") :
                               QCoreApplication::translate("QHostInfoAgent", "Invalid hostname"));
        return results;
    }

#if !defined (QT_NO_GETADDRINFO)
    // Call getaddrinfo, and place all IPv4 addresses at the start and
    // the IPv6 addresses at the end of the address list in results.
    addrinfo *res = 0;
    struct addrinfo hints;
    memset(&hints, 0, sizeof(hints));
    hints.ai_family = PF_UNSPEC;
#ifdef Q_ADDRCONFIG
    hints.ai_flags = Q_ADDRCONFIG;
#endif

    int result = getaddrinfo(aceHostname.constData(), 0, &hints, &res);
# ifdef Q_ADDRCONFIG
    if (result == EAI_BADFLAGS) {
        // if the lookup failed with AI_ADDRCONFIG set, try again without it
        hints.ai_flags = 0;
        result = getaddrinfo(aceHostname.constData(), 0, &hints, &res);
    }
# endif

    if (result == 0) {
        addrinfo *node = res;
        QList<QHostAddress> addresses;
        while (node) {
#ifdef QHOSTINFO_DEBUG
                qDebug() << "getaddrinfo node: flags:" << node->ai_flags << "family:" << node->ai_family << "ai_socktype:" << node->ai_socktype << "ai_protocol:" << node->ai_protocol << "ai_addrlen:" << node->ai_addrlen;
#endif
            if (node->ai_family == AF_INET) {
                QHostAddress addr;
                addr.setAddress(ntohl(((sockaddr_in *) node->ai_addr)->sin_addr.s_addr));
                if (!addresses.contains(addr))
                    addresses.append(addr);
            }
#ifndef QT_NO_IPV6
            else if (node->ai_family == AF_INET6) {
                QHostAddress addr;
                sockaddr_in6 *sa6 = (sockaddr_in6 *) node->ai_addr;
                addr.setAddress(sa6->sin6_addr.s6_addr);
                if (sa6->sin6_scope_id)
                    addr.setScopeId(QString::number(sa6->sin6_scope_id));
                if (!addresses.contains(addr))
                    addresses.append(addr);
            }
#endif
            node = node->ai_next;
        }
        if (addresses.isEmpty() && node == 0) {
            // Reached the end of the list, but no addresses were found; this
            // means the list contains one or more unknown address types.
            results.setError(QHostInfo::UnknownError);
            results.setErrorString(tr("Unknown address type"));
        }

        results.setAddresses(addresses);
        freeaddrinfo(res);
    } else if (result == EAI_NONAME
               || result ==  EAI_FAIL
#ifdef EAI_NODATA
           // EAI_NODATA is deprecated in RFC 3493
           || result == EAI_NODATA
#endif
           ) {
        results.setError(QHostInfo::HostNotFound);
        results.setErrorString(tr("Host not found"));
    } else {
        results.setError(QHostInfo::UnknownError);
        results.setErrorString(QString::fromLocal8Bit(gai_strerror(result)));
    }

#else
    // Fall back to gethostbyname for platforms that don't define
    // getaddrinfo. gethostbyname does not support IPv6, and it's not
    // reentrant on all platforms. For now this is okay since we only
    // use one QHostInfoAgent, but if more agents are introduced, locking
    // must be provided.
    QMutexLocker locker(::getHostByNameMutex());
    hostent *result = gethostbyname(aceHostname.constData());
    if (result) {
        if (result->h_addrtype == AF_INET) {
            QList<QHostAddress> addresses;
            for (char **p = result->h_addr_list; *p != 0; p++) {
                QHostAddress addr;
                addr.setAddress(ntohl(*((quint32 *)*p)));
                if (!addresses.contains(addr))
                    addresses.prepend(addr);
            }
            results.setAddresses(addresses);
        } else {
            results.setError(QHostInfo::UnknownError);
            results.setErrorString(tr("Unknown address type"));
        }
#if !defined(Q_OS_VXWORKS)
    } else if (h_errno == HOST_NOT_FOUND || h_errno == NO_DATA
               || h_errno == NO_ADDRESS) {
        results.setError(QHostInfo::HostNotFound);
        results.setErrorString(tr("Host not found"));
#endif
    } else {
        results.setError(QHostInfo::UnknownError);
        results.setErrorString(tr("Unknown error"));
    }
#endif //  !defined (QT_NO_GETADDRINFO)

#if defined(QHOSTINFO_DEBUG)
    if (results.error() != QHostInfo::NoError) {
        qDebug("QHostInfoAgent::fromName(): error #%d %s",
               h_errno, results.errorString().toLatin1().constData());
    } else {
        QString tmp;
        QList<QHostAddress> addresses = results.addresses();
        for (int i = 0; i < addresses.count(); ++i) {
            if (i != 0) tmp += ", ";
            tmp += addresses.at(i).toString();
        }
        qDebug("QHostInfoAgent::fromName(): found %i entries for \"%s\": {%s}",
               addresses.count(), hostName.toLatin1().constData(),
               tmp.toLatin1().constData());
    }
#endif
    return results;
}

fromName() [2/2]

QHostInfo QHostInfoAgent::fromName ( const QString &  hostName, QSharedPointer< QNetworkSession >  networkSession  )

static

Definition at line 302 of file qhostinfo.cpp.

{
    return QHostInfoAgent::fromName(hostName);
}

---

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

• /src/network/kernel/qhostinfo_p.h
• /src/network/kernel/qhostinfo.cpp
• /src/network/kernel/qhostinfo_unix.cpp
• /src/network/kernel/qhostinfo_win.cpp