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#include "q3serversocket.h"

#ifndef QT_NO_NETWORK

#include "qsocketnotifier.h"

QT_BEGIN_NAMESPACE

class Q3ServerSocketPrivate {

public:

    Q3ServerSocketPrivate(): s(0), n(0) {}

    ~Q3ServerSocketPrivate() { delete n; delete s; }

    Q3SocketDevice *s;

    QSocketNotifier *n;

};

/*!

    \class Q3ServerSocket

    \brief The Q3ServerSocket class provides a TCP-based server.

    \compat

    This class is a convenience class for accepting incoming TCP

    connections. You can specify the port or have Q3ServerSocket pick

    one, and listen on just one address or on all the machine's

    addresses.

    Using the API is very simple: subclass Q3ServerSocket, call the

    constructor of your choice, and implement newConnection() to

    handle new incoming connections. There is nothing more to do.

    (Note that due to lack of support in the underlying APIs,

    Q3ServerSocket cannot accept or reject connections conditionally.)

    \sa Q3Socket, Q3SocketDevice, QHostAddress, QSocketNotifier

*/

/*!

    Creates a server socket object, that will serve the given \a port

    on all the addresses of this host. If \a port is 0, Q3ServerSocket

    will pick a suitable port in a system-dependent manner. Use \a

    backlog to specify how many pending connections the server can

    have.

    The \a parent and \a name arguments are passed on to the QObject

    constructor.

    \warning On Tru64 Unix systems a value of 0 for \a backlog means

    that you don't accept any connections at all; you should specify a

    value larger than 0.

*/

Q3ServerSocket::Q3ServerSocket( Q_UINT16 port, int backlog,

			      QObject *parent, const char *name )

    : QObject( parent, name )

{

    d = new Q3ServerSocketPrivate;

    init( QHostAddress(), port, backlog );

}

/*!

    Creates a server socket object, that will serve the given \a port

    only on the given \a address. Use \a backlog to specify how many

    pending connections the server can have.

    The \a parent and \a name arguments are passed on to the QObject

    constructor.

    \warning On Tru64 Unix systems a value of 0 for \a backlog means

    that you don't accept any connections at all; you should specify a

    value larger than 0.

*/

Q3ServerSocket::Q3ServerSocket( const QHostAddress & address, Q_UINT16 port,

			      int backlog,

			      QObject *parent, const char *name )

    : QObject( parent, name )

{

    d = new Q3ServerSocketPrivate;

    init( address, port, backlog );

}

/*!

    Construct an empty server socket.

    This constructor, in combination with setSocket(), allows us to

    use the Q3ServerSocket class as a wrapper for other socket types

    (e.g. Unix Domain Sockets under Unix).

    The \a parent and \a name arguments are passed on to the QObject

    constructor.

    \sa setSocket()

*/

Q3ServerSocket::Q3ServerSocket( QObject *parent, const char *name )

    : QObject( parent, name )

{

    d = new Q3ServerSocketPrivate;

}

/*!

    Returns true if the construction succeeded; otherwise returns false.

*/

bool Q3ServerSocket::ok() const

{

    return !!d->s;

}

/*

  The common bit of the constructors.

 */

void Q3ServerSocket::init( const QHostAddress & address, Q_UINT16 port, int backlog )

{

    d->s = new Q3SocketDevice( Q3SocketDevice::Stream, address.isIPv4Address()

			      ? Q3SocketDevice::IPv4 : Q3SocketDevice::IPv6, 0 );

#if !defined(Q_OS_WIN32)

    // Under Unix, we want to be able to use the port, even if a socket on the

    // same address-port is in TIME_WAIT. Under Windows this is possible anyway

    // -- furthermore, the meaning of reusable is different: it means that you

    // can use the same address-port for multiple listening sockets.

    d->s->setAddressReusable( true );

#endif

    if ( d->s->bind( address, port )

      && d->s->listen( backlog ) )

    {

	d->n = new QSocketNotifier( d->s->socket(), QSocketNotifier::Read,

				    this, "accepting new connections" );

	connect( d->n, SIGNAL(activated(int)),

		 this, SLOT(incomingConnection(int)) );

    } else {

	qWarning( "Q3ServerSocket: failed to bind or listen to the socket" );

	delete d->s;

	d->s = 0;

    }

}

/*!

    Destroys the socket.

    This causes any backlogged connections (connections that have

    reached the host, but not yet been completely set up by calling

    Q3SocketDevice::accept()) to be severed.

    Existing connections continue to exist; this only affects the

    acceptance of new connections.

*/

Q3ServerSocket::~Q3ServerSocket()

{

    delete d;

}

/*!

    \fn void Q3ServerSocket::newConnection( int socket )

    This pure virtual function is responsible for setting up a new

    incoming connection. \a socket is the fd (file descriptor) for the

    newly accepted connection.

*/

void Q3ServerSocket::incomingConnection( int )

{

    int fd = d->s->accept();

    if ( fd >= 0 )

	newConnection( fd );

}

/*!

    Returns the port number on which this server socket listens. This

    is always non-zero; if you specify 0 in the constructor,

    Q3ServerSocket will pick a non-zero port itself. ok() must be true

    before calling this function.

    \sa address() Q3SocketDevice::port()

*/

Q_UINT16 Q3ServerSocket::port() const

{

    if ( !d || !d->s )

	return 0;

    return d->s->port();

}

/*!

    Returns the operating system socket.

*/

int Q3ServerSocket::socket() const

{

    if ( !d || !d->s )

	return -1;

    return d->s->socket();

}

/*!

    Returns the address on which this object listens, or 0.0.0.0 if

    this object listens on more than one address. ok() must be true

    before calling this function.

    \sa port() Q3SocketDevice::address()

*/

QHostAddress Q3ServerSocket::address() const

{

    if ( !d || !d->s )

	return QHostAddress();

    return d->s->address();

}

/*!

    Returns a pointer to the internal socket device. The returned

    pointer is 0 if there is no connection or pending connection.

    There is normally no need to manipulate the socket device directly

    since this class does all the necessary setup for most client or

    server socket applications.

*/

Q3SocketDevice *Q3ServerSocket::socketDevice()

{

    if ( !d )

	return 0;

    return d->s;

}

/*!

    Sets the socket to use \a socket. bind() and listen() should

    already have been called for \a socket.

    This allows us to use the Q3ServerSocket class as a wrapper for

    other socket types (e.g. Unix Domain Sockets).

*/

void Q3ServerSocket::setSocket( int socket )

{

    delete d;

    d = new Q3ServerSocketPrivate;

    d->s = new Q3SocketDevice( socket, Q3SocketDevice::Stream );

    d->n = new QSocketNotifier( d->s->socket(), QSocketNotifier::Read,

	       this, "accepting new connections" );

    connect( d->n, SIGNAL(activated(int)),

	     this, SLOT(incomingConnection(int)) );

}

QT_END_NAMESPACE

#endif //QT_NO_NETWORK