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

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** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).

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** Contact: Nokia Corporation (qt-info@nokia.com)

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** This file is part of the QtNetwork module of the Qt Toolkit.

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** No Commercial Usage

** This file contains pre-release code and may not be distributed.

** You may use this file in accordance with the terms and conditions

** contained in the Technology Preview License Agreement accompanying

** this package.

**

** GNU Lesser General Public License Usage

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** General Public License version 2.1 as published by the Free Software

** Foundation and appearing in the file LICENSE.LGPL included in the

** packaging of this file.  Please review the following information to

** ensure the GNU Lesser General Public License version 2.1 requirements

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** $QT_END_LICENSE$

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

#include "qlocalserver.h"

#include "qlocalserver_p.h"

#include "qlocalsocket.h"

#include "qlocalsocket_p.h"

#include "qnet_unix_p.h"

#ifndef QT_NO_LOCALSERVER

#include <sys/socket.h>

#include <sys/un.h>

#include <qdebug.h>

#include <qdir.h>

#include <qdatetime.h>

#ifdef Q_OS_VXWORKS

#  include <selectLib.h>

#endif

QT_BEGIN_NAMESPACE

void QLocalServerPrivate::init()

{

}

bool QLocalServerPrivate::removeServer(const QString &name)

{

    QString fileName;

    if (name.startsWith(QLatin1Char('/'))) {

        fileName = name;

    } else {

        fileName = QDir::cleanPath(QDir::tempPath());

        fileName += QLatin1Char('/') + name;

    }

    if (QFile::exists(fileName))

        return QFile::remove(fileName);

    else

        return true;

}

bool QLocalServerPrivate::listen(const QString &requestedServerName)

{

    Q_Q(QLocalServer);

    // determine the full server path

    if (requestedServerName.startsWith(QLatin1Char('/'))) {

        fullServerName = requestedServerName;

    } else {

        fullServerName = QDir::cleanPath(QDir::tempPath());

        fullServerName += QLatin1Char('/') + requestedServerName;

    }

    serverName = requestedServerName;

    // create the unix socket

    listenSocket = qt_safe_socket(PF_UNIX, SOCK_STREAM, 0);

    if (-1 == listenSocket) {

        setError(QLatin1String("QLocalServer::listen"));

        closeServer();

        return false;

    }

    // Construct the unix address

    struct ::sockaddr_un addr;

    addr.sun_family = PF_UNIX;

    if (sizeof(addr.sun_path) < (uint)fullServerName.toLatin1().size() + 1) {

        setError(QLatin1String("QLocalServer::listen"));

        closeServer();

        return false;

    }

    ::memcpy(addr.sun_path, fullServerName.toLatin1().data(),

             fullServerName.toLatin1().size() + 1);

#ifdef Q_OS_SYMBIAN

    // In SYMBIAN OS it can currently happen that accept is called twice,

    // once from waitForNewConnection and once via QSocketNotfier activity

    //

    // As an workaround, we set the socket to non blocking so possible

    // subsequent call to accept will not block in any case

    //

    // This change can be removed once more generic fix to select thread

    // syncronization problem is implemented.

    int flags = fcntl(listenSocket, F_GETFL, 0);

    if (-1 == flags

        || -1 == (fcntl(listenSocket, F_SETFL, flags | O_NONBLOCK))) {

        setError(QLatin1String("QLocalServer::listen"));

        closeServer();

        return false;

    }

#endif

    // bind

    if(-1 == QT_SOCKET_BIND(listenSocket, (sockaddr *)&addr, sizeof(sockaddr_un))) {

        setError(QLatin1String("QLocalServer::listen"));

        // if address is in use already, just close the socket, but do not delete the file

        if(errno == EADDRINUSE)

            QT_CLOSE(listenSocket);

        // otherwise, close the socket and delete the file

        else

            closeServer();

        listenSocket = -1;

        return false;

    }

    // listen for connections

    if (-1 == qt_safe_listen(listenSocket, 50)) {

        setError(QLatin1String("QLocalServer::listen"));

        closeServer();

        listenSocket = -1;

        if (error != QAbstractSocket::AddressInUseError)

            QFile::remove(fullServerName);

        return false;

    }

    Q_ASSERT(!socketNotifier);

    socketNotifier = new QSocketNotifier(listenSocket,

                                         QSocketNotifier::Read, q);

    q->connect(socketNotifier, SIGNAL(activated(int)),

               q, SLOT(_q_onNewConnection()));

    socketNotifier->setEnabled(maxPendingConnections > 0);

    return true;

}

/*!

    \internal

    \sa QLocalServer::closeServer()

 */

void QLocalServerPrivate::closeServer()

{

    if (-1 != listenSocket)

        QT_CLOSE(listenSocket);

    listenSocket = -1;

    if (socketNotifier) {

        socketNotifier->setEnabled(false); // Otherwise, closed socket is checked before deleter runs

        socketNotifier->deleteLater();

        socketNotifier = 0;

    }

    if (!fullServerName.isEmpty())

        QFile::remove(fullServerName);

}

/*!

    \internal

    We have received a notification that we can read on the listen socket.

    Accept the new socket.

 */

void QLocalServerPrivate::_q_onNewConnection()

{

    Q_Q(QLocalServer);

    if (-1 == listenSocket)

        return;

    ::sockaddr_un addr;

    QT_SOCKLEN_T length = sizeof(sockaddr_un);

    int connectedSocket = qt_safe_accept(listenSocket, (sockaddr *)&addr, &length);

    if(-1 == connectedSocket) {

        setError(QLatin1String("QLocalSocket::activated"));

        closeServer();

    } else {

        socketNotifier->setEnabled(pendingConnections.size()

                                   <= maxPendingConnections);

        q->incomingConnection(connectedSocket);

    }

}

void QLocalServerPrivate::waitForNewConnection(int msec, bool *timedOut)

{

    fd_set readfds;

    FD_ZERO(&readfds);

    FD_SET(listenSocket, &readfds);

    timeval timeout;

    timeout.tv_sec = msec / 1000;

    timeout.tv_usec = (msec % 1000) * 1000;

    int result = -1;

    result = qt_safe_select(listenSocket + 1, &readfds, 0, 0, (msec == -1) ? 0 : &timeout);

    if (-1 == result) {

        setError(QLatin1String("QLocalServer::waitForNewConnection"));

        closeServer();

    }

    if (result > 0)

        _q_onNewConnection();

    if (timedOut)

        *timedOut = (result == 0);

}

void QLocalServerPrivate::setError(const QString &function)

{

    if (EAGAIN == errno)

        return;

    switch (errno) {

    case EACCES:

        errorString = QLocalServer::tr("%1: Permission denied").arg(function);

        error = QAbstractSocket::SocketAccessError;

        break;

    case ELOOP:

    case ENOENT:

    case ENAMETOOLONG:

    case EROFS:

    case ENOTDIR:

        errorString = QLocalServer::tr("%1: Name error").arg(function);

        error = QAbstractSocket::HostNotFoundError;

        break;

    case EADDRINUSE:

        errorString = QLocalServer::tr("%1: Address in use").arg(function);

        error = QAbstractSocket::AddressInUseError;

        break;

    default:

        errorString = QLocalServer::tr("%1: Unknown error %2")

                      .arg(function).arg(errno);

        error = QAbstractSocket::UnknownSocketError;

#if defined QLOCALSERVER_DEBUG

        qWarning() << errorString << "fullServerName:" << fullServerName;

#endif

    }

}

QT_END_NAMESPACE

#endif // QT_NO_LOCALSERVER