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****************************************************************************/

#ifndef Q3DNS_H
#define Q3DNS_H

#include <QtCore/qobject.h>
#include <QtNetwork/qhostaddress.h>
#include <QtCore/qsocketnotifier.h>
#include <QtCore/qstringlist.h>
#include <Qt3Support/q3valuelist.h>

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

QT_MODULE(Qt3Support)

#ifndef QT_NO_DNS

//#define Q_DNS_SYNCHRONOUS

class Q3DnsPrivate;

class Q_COMPAT_EXPORT Q3Dns: public QObject {
    Q_OBJECT
public:
    enum RecordType {
	None,
	A, Aaaa,
	Mx, Srv,
	Cname,
	Ptr,
	Txt
    };

    Q3Dns();
    Q3Dns( const QString & label, RecordType rr = A );
    Q3Dns( const QHostAddress & address, RecordType rr = Ptr );
    virtual ~Q3Dns();

    // to set/change the query
    virtual void setLabel( const QString & label );
    virtual void setLabel( const QHostAddress & address );
    QString label() const { return l; }

    virtual void setRecordType( RecordType rr = A );
    RecordType recordType() const { return t; }

    // whether something is happening behind the scenes
    bool isWorking() const;

    // to query for replies
    Q3ValueList<QHostAddress> addresses() const;

    class Q_COMPAT_EXPORT MailServer {
    public:
	MailServer( const QString & n=QString(), Q_UINT16 p=0 )
	    :name(n), priority(p) {}
	QString name;
	Q_UINT16 priority;
	Q_DUMMY_COMPARISON_OPERATOR(MailServer)
    };
    Q3ValueList<MailServer> mailServers() const;

    class Q_COMPAT_EXPORT Server {
    public:
	Server(const QString & n=QString(), Q_UINT16 p=0, Q_UINT16 w=0, Q_UINT16 po=0 )
	    : name(n), priority(p), weight(w), port(po) {}
	QString name;
	Q_UINT16 priority;
	Q_UINT16 weight;
	Q_UINT16 port;
	Q_DUMMY_COMPARISON_OPERATOR(Server)
    };
    Q3ValueList<Server> servers() const;

    QStringList hostNames() const;

    QStringList texts() const;

    QString canonicalName() const; // ### real-world but uncommon: QStringList

    QStringList qualifiedNames() const { return n; }

#if defined(Q_DNS_SYNCHRONOUS)
protected:
    void connectNotify( const char *signal );
#endif

Q_SIGNALS:
    void resultsReady();

private Q_SLOTS:
    void startQuery();

private:
    static void doResInit();
    void setStartQueryTimer();
    static QString toInAddrArpaDomain( const QHostAddress &address );
#if defined(Q_DNS_SYNCHRONOUS)
    void doSynchronousLookup();
#endif

    QString l;
    QStringList n;
    RecordType t;
    Q3DnsPrivate * d;

    friend class Q3DnsAnswer;
    friend class Q3DnsManager;
};


// Q3DnsSocket are sockets that are used for DNS lookup

class Q3DnsSocket: public QObject {
    Q_OBJECT
    // note: Private not public.  This class contains NO public API.
protected:
    Q3DnsSocket( QObject *, const char * );
    virtual ~Q3DnsSocket();

private Q_SLOTS:
    virtual void cleanCache();
    virtual void retransmit();
    virtual void answer();
};

#endif // QT_NO_DNS

QT_END_NAMESPACE

QT_END_HEADER

#endif // Q3DNS_H