transferserver.cpp

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/**********************************************************************
** Copyright (C) 2000-2002 Trolltech AS.  All rights reserved.
**
** This file is part of the Qtopia Environment.
**
** This file may be distributed and/or modified under the terms of the
** GNU General Public License version 2 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
** See http://www.trolltech.com/gpl/ for GPL licensing information.
**
** Contact info@trolltech.com if any conditions of this licensing are
** not clear to you.
**
**********************************************************************/
#include "transferserver.h"

/* OPIE */
#include <opie2/odebug.h>
#include <opie2/oglobal.h>
#include <qtopia/qprocess.h>
#include <qtopia/process.h>
#include <qtopia/private/contact.h>
#include <qtopia/version.h>
#ifdef Q_WS_QWS
#include <qtopia/qcopenvelope_qws.h>
#endif
using namespace Opie::Core;

/* QT */
#include <qtextstream.h>
#include <qmessagebox.h>

/* STD */
#include <pwd.h>
#include <sys/types.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdlib.h>
#include <time.h>

#ifndef Q_OS_MACX
#include <shadow.h>
#include <crypt.h>
#endif /* Q_OS_MACX */

const int block_size = 51200;

TransferServer::TransferServer( Q_UINT16 port, QObject *parent,
        const char* name)
    : QServerSocket( port, 1, parent, name )
{
    connections.setAutoDelete( TRUE );
    if ( !ok() )
        owarn << "Failed to bind to port " << port << "" << oendl;
    else
        ::fcntl( socket(), F_SETFD, FD_CLOEXEC );       
}

void TransferServer::authorizeConnections()
{
    QListIterator<ServerPI> it(connections);
    while ( it.current() ) {
    if ( !it.current()->verifyAuthorised() ) {
        disconnect( it.current(), SIGNAL(connectionClosed(ServerPI*)), this, SLOT( closed(ServerPI*)) );
        connections.removeRef( it.current() );
    } else
        ++it;
    }
}

void TransferServer::closed(ServerPI *item)
{
    connections.removeRef(item);
}

TransferServer::~TransferServer()
{
}

void TransferServer::newConnection( int socket )
{
    ServerPI *ptr = new ServerPI( socket, this );
    connect( ptr, SIGNAL(connectionClosed(ServerPI*)), this, SLOT( closed(ServerPI*)) );
    connections.append( ptr );
}

QString SyncAuthentication::serverId()
{
    Config cfg("Security");
    cfg.setGroup("Sync");
    QString r = cfg.readEntry("serverid");

    if ( r.isEmpty() ) {
        r = OGlobal::generateUuid();
        cfg.writeEntry("serverid", r );
    }
   return r;
}

QString SyncAuthentication::ownerName()
{
    QString vfilename = Global::applicationFileName("addressbook",
                "businesscard.vcf");
    if (QFile::exists(vfilename)) {
    Contact c;
    c = Contact::readVCard( vfilename )[0];
    return c.fullName();
    }

    return QString::null;
}

QString SyncAuthentication::loginName()
{
    struct passwd *pw = 0L;
#ifndef Q_OS_WIN32
    pw = getpwuid( geteuid() );
    return QString::fromLocal8Bit( pw->pw_name );
#else
    //### revise
    return QString();
#endif
}

int SyncAuthentication::isAuthorized(QHostAddress peeraddress)
{
    Config cfg("Security");
    cfg.setGroup("Sync");
    //    QString allowedstr = cfg.readEntry("auth_peer","192.168.1.0");
    uint auth_peer = cfg.readNumEntry("auth_peer", 0xc0a80100);

    //    QHostAddress allowed;
    //    allowed.setAddress(allowedstr);
    //    uint auth_peer = allowed.ip4Addr();
    uint auth_peer_bits = cfg.readNumEntry("auth_peer_bits", 24);
    uint mask = auth_peer_bits >= 32 // shifting by 32 is not defined
                ? 0xffffffff : (((1 << auth_peer_bits) - 1) << (32 - auth_peer_bits));

    return (peeraddress.ip4Addr() & mask) == auth_peer;
}

bool SyncAuthentication::checkUser( const QString& user )
{
    if ( user.isEmpty() ) return FALSE;
    QString euser = loginName();
    return user == euser;
}

bool SyncAuthentication::checkPassword( const QString& password )
{
#ifdef ALLOW_UNIX_USER_FTP
    // First, check system password...

    struct passwd *pw = 0;
    struct spwd *spw = 0;

    pw = getpwuid( geteuid() );
    spw = getspnam( pw->pw_name );

    QString cpwd = QString::fromLocal8Bit( pw->pw_passwd );
    if ( cpwd == "x" && spw )
    cpwd = QString::fromLocal8Bit( spw->sp_pwdp );

    // Note: some systems use more than crypt for passwords.
    QString cpassword = QString::fromLocal8Bit( crypt( password.local8Bit(), cpwd.local8Bit() ) );
    if ( cpwd == cpassword )
    return TRUE;
#endif

    static int lastdenial=0;
    static int denials=0;
    int now = time(0);

    Config cfg("Security");
    cfg.setGroup("SyncMode");
    int mode = cfg.readNumEntry("Mode", 0x02 );

    //No pass word needed if the user really needs it
    if (mode & 0x04) {
        QMessageBox unauth(
            tr("Sync Connection"),
            tr("<qt><p>An unauthorized system is requesting access to this device."
               "<p>You chose IntelliSync so you may I allow or deny this connection.</qt>" ),
            QMessageBox::Warning,
            QMessageBox::Ok, QMessageBox::Cancel|QMessageBox::Default, QMessageBox::NoButton,
            0, QString::null, TRUE, WStyle_StaysOnTop);
        unauth.setButtonText(QMessageBox::Ok, tr("Allow" ) );
        unauth.setButtonText(QMessageBox::Cancel, tr("Deny"));
        switch( unauth.exec() ) {
        case QMessageBox::Ok:
            return TRUE;
            break;
        case QMessageBox::Cancel:
        default:
            denials++;
            lastdenial=now;
            return FALSE;
        }
    }

    // Detect old Qtopia Desktop (no password) and fail
    if ( password.isEmpty() ) {
        if ( denials < 3 || now > lastdenial+600 ) {
            QMessageBox unauth(
            tr("Sync Connection"),
            tr("<p>An unauthorized system is requesting access to this device."
                "<p>If you are using a version of Qtopia Desktop older than 1.5.1, "
                "please upgrade or change the security setting to use IntelliSync." ),
            QMessageBox::Warning,
            QMessageBox::Cancel, QMessageBox::NoButton, QMessageBox::NoButton,
            0, QString::null, TRUE, WStyle_StaysOnTop);
            unauth.setButtonText(QMessageBox::Cancel, tr("Deny"));
            unauth.exec();

            denials++;
            lastdenial=now;
         }
        return FALSE;

    }

    // Second, check sync password...

    static int lock=0;
    if ( lock ) return FALSE;

    ++lock;

    /*
     *  we need to support old Sync software and QtopiaDesktop
     */
    if ( password.left(6) == "Qtopia" || password.left(6) == "rootme" ) {
    cfg.setGroup("Sync");
    QStringList pwds = cfg.readListEntry("Passwords",' ');
    for (QStringList::ConstIterator it=pwds.begin(); it!=pwds.end(); ++it) {
#ifndef Q_OS_WIN32
        QString cpassword = QString::fromLocal8Bit(
        crypt( password.mid(8).local8Bit(), (*it).left(2).latin1() ) );
#else
        // ### revise
        QString cpassword("");
#endif
        if ( *it == cpassword ) {
        lock--;
        return TRUE;
        }
    }

    // Unrecognized system. Be careful...
    QMessageBox unrecbox(
        tr("Sync Connection"),
        tr( "<p>An unrecognized system is requesting access to this device."
        "<p>If you have just initiated a Sync for the first time, this is normal."),
        QMessageBox::Warning,
        QMessageBox::Cancel, QMessageBox::Yes, QMessageBox::NoButton,
        0, QString::null, TRUE, WStyle_StaysOnTop);
    unrecbox.setButtonText(QMessageBox::Cancel, tr("Deny"));
    unrecbox.setButtonText(QMessageBox::Yes, tr("Allow"));

    if ( (denials > 2 && now < lastdenial+600)
        || unrecbox.exec() != QMessageBox::Yes)
    {
        denials++;
        lastdenial=now;
        lock--;
        return FALSE;
    } else {
        const char salty[]="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789/.";
        char salt[2];
        salt[0]= salty[rand() % (sizeof(salty)-1)];
        salt[1]= salty[rand() % (sizeof(salty)-1)];
#ifndef Q_OS_WIN32
        QString cpassword = QString::fromLocal8Bit(
        crypt( password.mid(8).local8Bit(), salt ) );
#else
        //### revise
        QString cpassword("");
#endif
        denials=0;
        pwds.prepend(cpassword);
        cfg.writeEntry("Passwords",pwds,' ');
        lock--;
        return TRUE;
    }
    }
    lock--;

    return FALSE;
}


ServerPI::ServerPI( int socket, QObject *parent, const char* name )
    : QSocket( parent, name ) , dtp( 0 ), serversocket( 0 ), waitsocket( 0 ),
      storFileSize(-1)
{
    state = Connected;

    setSocket( socket );

    peerport = peerPort();
    peeraddress = peerAddress();

#ifndef INSECURE
    if ( !SyncAuthentication::isAuthorized(peeraddress) ) {
    state = Forbidden;
    startTimer( 0 );
    } else
#endif
    {
    connect( this, SIGNAL( readyRead() ), SLOT( read() ) );
    connect( this, SIGNAL( connectionClosed() ), SLOT( connectionClosed() ) );

    passiv = FALSE;
    for( int i = 0; i < 4; i++ )
        wait[i] = FALSE;

    send( "220 Qtopia " QPE_VERSION " FTP Server" ); // No tr
    state = Wait_USER;

    dtp = new ServerDTP( this );
    connect( dtp, SIGNAL( completed() ), SLOT( dtpCompleted() ) );
    connect( dtp, SIGNAL( failed() ), SLOT( dtpFailed() ) );
    connect( dtp, SIGNAL( error(int) ), SLOT( dtpError(int) ) );


    directory = QDir::currentDirPath();

    static int p = 1024;

    while ( !serversocket || !serversocket->ok() ) {
        delete serversocket;
        serversocket = new ServerSocket( ++p, this );
    }
    connect( serversocket, SIGNAL( newIncomming(int) ),
         SLOT( newConnection(int) ) );
    }
}

ServerPI::~ServerPI()
{
    close();

    if ( dtp )
        dtp->close();
    delete dtp;
    delete serversocket;
}

bool ServerPI::verifyAuthorised()
{
    if ( !SyncAuthentication::isAuthorized(peerAddress()) ) {
    state = Forbidden;
    return FALSE;
    }
    return TRUE;
}

void ServerPI::connectionClosed()
{
    // odebug << "Debug: Connection closed" << oendl;
    emit connectionClosed(this);
}

void ServerPI::send( const QString& msg )
{
    QTextStream os( this );
    os << msg << endl;
    //odebug << "Reply: " << msg << "" << oendl;
}

void ServerPI::read()
{
    while ( canReadLine() )
    process( readLine().stripWhiteSpace() );
}

bool ServerPI::checkReadFile( const QString& file )
{
    QString filename;
    
    if ( file.length() == 1 && file[0] == "/" )
    filename = file;
    else if ( file[0] != "/" ) 
    filename = directory.path() + "/" + file;
    else
    filename = file;

    QFileInfo fi( filename );
    return ( fi.exists() && fi.isReadable() );
}

bool ServerPI::checkWriteFile( const QString& file )
{
    QString filename;

    if ( file[0] != "/" )
    filename = directory.path() + "/" + file;
    else
    filename = file;

    QFileInfo fi( filename );

    if ( fi.exists() )
    if ( !QFile( filename ).remove() )
        return FALSE;
    return TRUE;
}

void ServerPI::process( const QString& message )
{
    //odebug << "Command: " << message << "" << oendl;

    // split message using "," as separator
    QStringList msg = QStringList::split( " ", message );
    if ( msg.isEmpty() ) return;

    // command token
    QString cmd = msg[0].upper();

    // argument token
    QString arg;
    if ( msg.count() >= 2 )
    arg = msg[1];

    // full argument string
    QString args;
    if ( msg.count() >= 2 ) {
        QStringList copy( msg );
        // FIXME: for Qt3
        // copy.pop_front()
        copy.remove( copy.begin() );
        args = copy.join( " " );
    }

    //odebug << "args: " << args << "" << oendl;

    // we always respond to QUIT, regardless of state
    if ( cmd == "QUIT" ) {
    send( "211 Good bye!" ); // No tr
    close();
    return;
    }

    // connected to client
    if ( Connected == state )
    return;

    // waiting for user name
    if ( Wait_USER == state ) {

    if ( cmd != "USER" || msg.count() < 2 || !SyncAuthentication::checkUser( arg ) ) {
        send( "530 Please login with USER and PASS" ); // No tr
        return;
    }
    send( "331 User name ok, need password" ); // No tr
    state = Wait_PASS;
    return;
    }

    // waiting for password
    if ( Wait_PASS == state ) {

    if ( cmd != "PASS" || !SyncAuthentication::checkPassword( arg ) ) {
        send( "530 Please login with USER and PASS" ); // No tr
        return;
    }
    send( "230 User logged in, proceed" ); // No tr
    state = Ready;
    return;
    }

    // ACCESS CONTROL COMMANDS

    // Only an ALLO sent immediately before STOR is valid.
    if ( cmd != "STOR" )
    storFileSize = -1;

    // account (ACCT)
    if ( cmd == "ACCT" ) {
    // even wu-ftp does not support it
    send( "502 Command not implemented" ); // No tr
    }

    // change working directory (CWD)
    else if ( cmd == "CWD" ) {

    if ( !args.isEmpty() ) {
        if ( directory.cd( args, TRUE ) )
        send( "250 Requested file action okay, completed" ); // No tr
        else
        send( "550 Requested action not taken" ); // No tr
    }
    else
        send( "500 Syntax error, command unrecognized" ); // No tr
    }

    // change to parent directory (CDUP)
    else if ( cmd == "CDUP" ) {
    if ( directory.cdUp() )
        send( "250 Requested file action okay, completed" ); // No tr
    else
        send( "550 Requested action not taken" ); // No tr
    }

    // structure mount (SMNT)
    else if ( cmd == "SMNT" ) {
    // even wu-ftp does not support it
    send( "502 Command not implemented" ); // No tr
    }

    // reinitialize (REIN)
    else if ( cmd == "REIN" ) {
    // even wu-ftp does not support it
    send( "502 Command not implemented" ); // No tr
    }


    // TRANSFER PARAMETER COMMANDS


    // data port (PORT)
    else if ( cmd == "PORT" ) {
    if ( parsePort( arg ) )
        send( "200 Command okay" ); // No tr
    else
        send( "500 Syntax error, command unrecognized" ); // No tr
    }

    // passive (PASV)
    else if ( cmd == "PASV" ) {
    passiv = TRUE;
    send( "227 Entering Passive Mode (" // No tr
          + address().toString().replace( QRegExp( "\\." ), "," ) + ","
          + QString::number( ( serversocket->port() ) >> 8 ) + ","
          + QString::number( ( serversocket->port() ) & 0xFF ) +")" );
    }

    // representation type (TYPE)
    else if ( cmd == "TYPE" ) {
    if ( arg.upper() == "A" || arg.upper() == "I" )
        send( "200 Command okay" ); // No tr
    else
        send( "504 Command not implemented for that parameter" ); // No tr
    }

    // file structure (STRU)
    else if ( cmd == "STRU" ) {
    if ( arg.upper() == "F" )
        send( "200 Command okay" ); // No tr
    else
        send( "504 Command not implemented for that parameter" ); // No tr
    }

    // transfer mode (MODE)
    else if ( cmd == "MODE" ) {
    if ( arg.upper() == "S" )
        send( "200 Command okay" ); // No tr
    else
        send( "504 Command not implemented for that parameter" ); // No tr
    }


    // FTP SERVICE COMMANDS


    // retrieve (RETR)
    else if ( cmd == "RETR" )
    if ( !args.isEmpty() && checkReadFile( absFilePath( args ) )
         || backupRestoreGzip( absFilePath( args ) ) ) {
        send( "150 File status okay" ); // No tr
        sendFile( absFilePath( args ) );
    }
    else {
        odebug << "550 Requested action not taken" << oendl;
        send( "550 Requested action not taken" ); // No tr
    }

    // store (STOR)
    else if ( cmd == "STOR" )
    if ( !args.isEmpty() && checkWriteFile( absFilePath( args ) ) ) {
        send( "150 File status okay" ); // No tr
        retrieveFile( absFilePath( args ) );
    }
    else
        send( "550 Requested action not taken" ); // No tr

    // store unique (STOU)
    else if ( cmd == "STOU" ) {
    send( "502 Command not implemented" ); // No tr
    }

    // append (APPE)
    else if ( cmd == "APPE" ) {
    send( "502 Command not implemented" ); // No tr
    }

    // allocate (ALLO)
    else if ( cmd == "ALLO" ) {
    storFileSize = args.toInt();
    send( "200 Command okay" ); // No tr
    }

    // restart (REST)
    else if ( cmd == "REST" ) {
    send( "502 Command not implemented" ); // No tr
    }

    // rename from (RNFR)
    else if ( cmd == "RNFR" ) {
    renameFrom = QString::null;
    if ( args.isEmpty() )
        send( "500 Syntax error, command unrecognized" ); // No tr
    else {
        QFile file( absFilePath( args ) );
        if ( file.exists() ) {
        send( "350 File exists, ready for destination name" ); // No tr
        renameFrom = absFilePath( args );
        }
        else
        send( "550 Requested action not taken" ); // No tr
    }
    }

    // rename to (RNTO)
    else if ( cmd == "RNTO" ) {
    if ( lastCommand != "RNFR" )
        send( "503 Bad sequence of commands" ); // No tr
    else if ( args.isEmpty() )
        send( "500 Syntax error, command unrecognized" ); // No tr
    else {
        QDir dir( absFilePath( args ) );
        if ( dir.rename( renameFrom, absFilePath( args ), TRUE ) )
        send( "250 Requested file action okay, completed." ); // No tr
        else
        send( "550 Requested action not taken" ); // No tr
    }
    }

    // abort (ABOR)
    else if ( cmd.contains( "ABOR" ) ) {
    dtp->close();
    if ( dtp->dtpMode() != ServerDTP::Idle )
        send( "426 Connection closed; transfer aborted" ); // No tr
    else
        send( "226 Closing data connection" ); // No tr
    }

    // delete (DELE)
    else if ( cmd == "DELE" ) {
    if ( args.isEmpty() )
        send( "500 Syntax error, command unrecognized" ); // No tr
    else {
        QFile file( absFilePath( args ) ) ;
        if ( file.remove() ) {
        send( "250 Requested file action okay, completed" ); // No tr
        QCopEnvelope e("QPE/System", "linkChanged(QString)" );
        e << file.name();
        } else {
        send( "550 Requested action not taken" ); // No tr
        }
    }
    }

    // remove directory (RMD)
    else if ( cmd == "RMD" ) {
    if ( args.isEmpty() )
        send( "500 Syntax error, command unrecognized" ); // No tr
    else {
        QDir dir;
        if ( dir.rmdir( absFilePath( args ), TRUE ) )
        send( "250 Requested file action okay, completed" ); // No tr
        else
        send( "550 Requested action not taken" ); // No tr
    }
    }

    // make directory (MKD)
    else if ( cmd == "MKD" ) {
    if ( args.isEmpty() ) {
        odebug << " Error: no arg" << oendl;
        send( "500 Syntax error, command unrecognized" ); // No tr
    }
    else {
        QDir dir;
        if ( dir.mkdir( absFilePath( args ), TRUE ) )
        send( "250 Requested file action okay, completed." ); // No tr
        else
        send( "550 Requested action not taken" ); // No tr
    }
    }

    // print working directory (PWD)
    else if ( cmd == "PWD" ) {
    send( "257 \"" + directory.path() +"\"" );
    }

    // list (LIST)
    else if ( cmd == "LIST" ) {
    if ( args == "-la" )
        args = QString::null;
    
    if ( sendList( absFilePath( args ) ) )
        send( "150 File status okay" ); // No tr
    else
        send( "500 Syntax error, command unrecognized" ); // No tr
    }

    // size (SIZE)
    else if ( cmd == "SIZE" ) {
    QString filePath = absFilePath( args );
    QFileInfo fi( filePath );
    bool gzipfile = backupRestoreGzip( filePath );
    if ( !fi.exists() && !gzipfile )
        send( "500 Syntax error, command unrecognized" ); // No tr
    else {
        if ( !gzipfile )
        send( "213 " + QString::number( fi.size() ) );
        else {
        Process duproc( QString("du") );
        duproc.addArgument("-s");
        QString in, out;
        if ( !duproc.exec(in, out) ) {
            odebug << "du process failed; just sending back 1K" << oendl;
            send( "213 1024");
        }
        else {
            QString size = out.left( out.find("\t") );
            int guess = size.toInt()/5;
            if ( filePath.contains("doc") ) // No tr
            guess *= 1000;
            odebug << "sending back gzip guess of " << guess << "" << oendl;
            send( "213 " + QString::number(guess) );
        }
        }
    }
    }
    // name list (NLST)
    else if ( cmd == "NLST" ) {
    send( "502 Command not implemented" ); // No tr
    }

    // site parameters (SITE)
    else if ( cmd == "SITE" ) {
    send( "502 Command not implemented" ); // No tr
    }

    // system (SYST)
    else if ( cmd == "SYST" ) {
    send( "215 UNIX Type: L8" ); // No tr
    }

    // status (STAT)
    else if ( cmd == "STAT" ) {
    send( "502 Command not implemented" ); // No tr
    }

    // help (HELP )
    else if ( cmd == "HELP" ) {
    send( "502 Command not implemented" ); // No tr
    }

    // noop (NOOP)
    else if ( cmd == "NOOP" ) {
    send( "200 Command okay" ); // No tr
    }

    // not implemented
    else
    send( "502 Command not implemented" ); // No tr

    lastCommand = cmd;
}

bool ServerPI::backupRestoreGzip( const QString &file )
{
    return (file.find( "backup" ) != -1 && // No tr
        file.findRev( ".tgz" ) == (int)file.length()-4 );
}

bool ServerPI::backupRestoreGzip( const QString &file, QStringList &targets )
{
  if ( file.find( "backup" ) != -1 && // No tr
       file.findRev( ".tgz" ) == (int)file.length()-4 ) {
      QFileInfo info( file );
      targets = info.dirPath( TRUE );
      odebug << "ServerPI::backupRestoreGzip for " << file.latin1() << " = " << targets.join(" ").latin1() << oendl;
      return true;
  }
  return false;
}

void ServerPI::sendFile( const QString& file )
{
    if ( passiv ) {
    wait[SendFile] = TRUE;
    waitfile = file;
    if ( waitsocket )
        newConnection( waitsocket );
    }
    else {
      QStringList targets;
      if ( backupRestoreGzip( file, targets ) )
      dtp->sendGzipFile( file, targets, peeraddress, peerport );
      else dtp->sendFile( file, peeraddress, peerport );
    }
}

void ServerPI::retrieveFile( const QString& file )
{
    if ( passiv ) {
    wait[RetrieveFile] = TRUE;
    waitfile = file;
    if ( waitsocket )
        newConnection( waitsocket );
    }
    else {
      QStringList targets;
      if ( backupRestoreGzip( file, targets ) )
    dtp->retrieveGzipFile( file, peeraddress, peerport );
      else
    dtp->retrieveFile( file, peeraddress, peerport, storFileSize );
    }
}

bool ServerPI::parsePort( const QString& pp )
{
    QStringList p = QStringList::split( ",", pp );
    if ( p.count() != 6 ) return FALSE;

    // h1,h2,h3,h4,p1,p2
    peeraddress = QHostAddress( ( p[0].toInt() << 24 ) + ( p[1].toInt() << 16 ) +
                ( p[2].toInt() << 8 ) + p[3].toInt() );
    peerport = ( p[4].toInt() << 8 ) + p[5].toInt();
    return TRUE;
}

void ServerPI::dtpCompleted()
{
    send( "226 Closing data connection, file transfer successful" ); // No tr
    if ( dtp->dtpMode() == ServerDTP::RetrieveFile ) {
    QString fn = dtp->fileName();
    if ( fn.right(8)==".desktop" && fn.find("/Documents/")>=0 ) {
        QCopEnvelope e("QPE/System", "linkChanged(QString)" );
        e << fn;
    }
    }
    waitsocket = 0;
    dtp->close();
    storFileSize = -1;
}

void ServerPI::dtpFailed()
{
    dtp->close();
    waitsocket = 0;
    send( "451 Requested action aborted: local error in processing" ); // No tr
    storFileSize = -1;
}

void ServerPI::dtpError( int )
{
    dtp->close();
    waitsocket = 0;
    send( "451 Requested action aborted: local error in processing" ); // No tr
    storFileSize = -1;
}

bool ServerPI::sendList( const QString& arg )
{
    QByteArray listing;
    QBuffer buffer( listing );

    if ( !buffer.open( IO_WriteOnly ) )
    return FALSE;

    QTextStream ts( &buffer );
    QString fn = arg;

    if ( fn.isEmpty() )
    fn = directory.path();

    QFileInfo fi( fn );
    if ( !fi.exists() ) return FALSE;

    // return file listing
    if ( fi.isFile() ) {
    ts << fileListing( &fi ) << endl;
    }

    // return directory listing
    else if ( fi.isDir() ) {
    QDir dir( fn );
    const QFileInfoList *list = dir.entryInfoList( QDir::All | QDir::Hidden );

    QFileInfoListIterator it( *list );
    QFileInfo *info;

    unsigned long total = 0;
    while ( ( info = it.current() ) ) {
        if ( info->fileName() != "." && info->fileName() != ".." )
        total += info->size();
        ++it;
    }

    ts << "total " << QString::number( total / 1024 ) << endl; // No tr

    it.toFirst();
    while ( ( info = it.current() ) ) {
        if ( info->fileName() == "." || info->fileName() == ".." ) {
        ++it;
        continue;
        }
        ts << fileListing( info ) << endl;
        ++it;
    }
    }

    if ( passiv ) {
    waitarray = buffer.buffer();
    wait[SendByteArray] = TRUE;
    if ( waitsocket )
        newConnection( waitsocket );
    }
    else
    dtp->sendByteArray( buffer.buffer(), peeraddress, peerport );
    return TRUE;
}

QString ServerPI::fileListing( QFileInfo *info )
{
    if ( !info ) return QString::null;
    QString s;

    // type char
    if ( info->isDir() )
    s += "d";
    else if ( info->isSymLink() )
    s += "l";
    else
    s += "-";

    // permisson string
    s += permissionString( info ) + " ";

    // number of hardlinks
    int subdirs = 1;

    if ( info->isDir() )
    subdirs = 2;
    // FIXME : this is to slow
    //if ( info->isDir() )
    //subdirs = QDir( info->absFilePath() ).entryList( QDir::Dirs ).count();

    s += QString::number( subdirs ).rightJustify( 3, ' ', TRUE ) + " ";

    // owner
    QString o = info->owner();
    if ( o.isEmpty() )
    o = QString::number(info->ownerId());
    s += o.leftJustify( 8, ' ', TRUE ) + " ";

    // group
    QString g = info->group();
    if ( g.isEmpty() )
    g = QString::number(info->groupId());
    s += g.leftJustify( 8, ' ', TRUE ) + " ";

    // file size in bytes
    s += QString::number( info->size() ).rightJustify( 9, ' ', TRUE ) + " ";

    // last modified date
    QDate date = info->lastModified().date();
    QTime time = info->lastModified().time();
    s += date.monthName( date.month() ) + " "
     + QString::number( date.day() ).rightJustify( 2, ' ', TRUE ) + " "
     + QString::number( time.hour() ).rightJustify( 2, '0', TRUE ) + ":"
     + QString::number( time.minute() ).rightJustify( 2,'0', TRUE ) + " ";

    // file name
    s += info->fileName();

    return s;
}

QString ServerPI::permissionString( QFileInfo *info )
{
    if ( !info ) return QString( "---------" );
    QString s;

    // user
    if ( info->permission( QFileInfo::ReadUser ) ) s += "r";
    else s += "-";
    if ( info->permission( QFileInfo::WriteUser ) ) s += "w";
    else s += "-";
    if ( info->permission( QFileInfo::ExeUser ) ) s += "x";
    else s += "-";

    // group
    if ( info->permission( QFileInfo::ReadGroup ) ) s += "r";
    else s += "-";
    if ( info->permission( QFileInfo::WriteGroup ) )s += "w";
    else s += "-";
    if ( info->permission( QFileInfo::ExeGroup ) ) s += "x";
    else s += "-";

    // exec
    if ( info->permission( QFileInfo::ReadOther ) ) s += "r";
    else s += "-";
    if ( info->permission( QFileInfo::WriteOther ) ) s += "w";
    else s += "-";
    if ( info->permission( QFileInfo::ExeOther ) ) s += "x";
    else s += "-";

    return s;
}

void ServerPI::newConnection( int socket )
{
    //odebug << "New incomming connection" << oendl;

    if ( !passiv ) return;

    if ( wait[SendFile] ) {
    QStringList targets;
    if ( backupRestoreGzip( waitfile, targets ) )
        dtp->sendGzipFile( waitfile, targets );
    else
        dtp->sendFile( waitfile );
    dtp->setSocket( socket );
    }
    else if ( wait[RetrieveFile] ) {
      odebug << "check retrieve file" << oendl;
      if ( backupRestoreGzip( waitfile ) )
    dtp->retrieveGzipFile( waitfile );
      else
    dtp->retrieveFile( waitfile, storFileSize );
      dtp->setSocket( socket );
    }
    else if ( wait[SendByteArray] ) {
    dtp->sendByteArray( waitarray );
    dtp->setSocket( socket );
    }
    else if ( wait[RetrieveByteArray] ) {
    odebug << "retrieve byte array" << oendl;
    dtp->retrieveByteArray();
    dtp->setSocket( socket );
    }
    else
    waitsocket = socket;

    for( int i = 0; i < 4; i++ )
    wait[i] = FALSE;
}

QString ServerPI::absFilePath( const QString& file )
{
    if ( file.isEmpty() ) return file;

    QString filepath( file );
    if ( file[0] != "/" )
    filepath = directory.path() + "/" + file;

    return filepath;
}


void ServerPI::timerEvent( QTimerEvent * )
{
    connectionClosed();
}


ServerDTP::ServerDTP( QObject *parent, const char* name)
  : QSocket( parent, name ), mode( Idle ), createTargzProc( 0 ),
    retrieveTargzProc( 0 )
{

  connect( this, SIGNAL( connected() ), SLOT( connected() ) );
  connect( this, SIGNAL( connectionClosed() ), SLOT( connectionClosed() ) );
  connect( this, SIGNAL( bytesWritten(int) ), SLOT( bytesWritten(int) ) );
  connect( this, SIGNAL( readyRead() ), SLOT( readyRead() ) );

  createTargzProc = new QProcess( QString("tar"), this, "createTargzProc"); // No tr
  createTargzProc->setCommunication( QProcess::Stdout );
  createTargzProc->setWorkingDirectory( QDir::rootDirPath() );
  connect( createTargzProc, SIGNAL( processExited() ), SLOT( targzDone() ) );

  retrieveTargzProc = new QProcess( this, "retrieveTargzProc" );
  retrieveTargzProc->setCommunication( QProcess::Stdin );
  retrieveTargzProc->setWorkingDirectory( QDir::rootDirPath() );
  connect( retrieveTargzProc, SIGNAL( processExited() ),
       SIGNAL( completed() ) );
  connect( retrieveTargzProc, SIGNAL( processExited() ),
       SLOT( extractTarDone() ) );
}

ServerDTP::~ServerDTP()
{
    buf.close();
    if ( RetrieveFile == mode && file.isOpen() ) {
    // We're being shutdown before the client closed.
    file.close();
    if ( recvFileSize >= 0 && (int)file.size() != recvFileSize ) {
        odebug << "STOR incomplete" << oendl;
        file.remove();
    }
    } else {
    file.close();
    }
    createTargzProc->kill();
}

void ServerDTP::extractTarDone()
{
    odebug << "extract done" << oendl;
#ifndef QT_NO_COP
    QCopEnvelope e( "QPE/System", "restoreDone(QString)" );
    e << file.name();
#endif
}

void ServerDTP::connected()
{
  // send file mode
  switch ( mode ) {
  case SendFile :
    if ( !file.exists() || !file.open( IO_ReadOnly) ) {
      emit failed();
      mode = Idle;
      return;
    }

    //odebug << "Debug: Sending file '" << file.name() << "'" << oendl;

    bytes_written = 0;
    if ( file.size() == 0 ) {
      //make sure it doesn't hang on empty files
      file.close();
      emit completed();
      mode = Idle;
    } else {
      // Don't write more if there is plenty buffered already.
      if ( bytesToWrite() <= block_size && !file.atEnd() ) {
    QCString s;
    s.resize( block_size );
    int bytes = file.readBlock( s.data(), block_size );
    writeBlock( s.data(), bytes );
      }
    }
    break;
  case SendGzipFile:
    if ( createTargzProc->isRunning() ) {
      // SHOULDN'T GET HERE, BUT DOING A SAFETY CHECK ANYWAY
      owarn << "Previous tar --gzip process is still running; killing it..." << oendl;
      createTargzProc->kill();
    }

    bytes_written = 0;
    odebug << "==>start send tar process" << oendl;
    if ( !createTargzProc->start() )
      owarn << "Error starting " << createTargzProc->arguments().join(" ").latin1() << oendl;
    break;
  case SendBuffer:
    if ( !buf.open( IO_ReadOnly) ) {
      emit failed();
      mode = Idle;
      return;
    }

    // odebug << "Debug: Sending byte array" << oendl;
    bytes_written = 0;
    while( !buf.atEnd() )
      putch( buf.getch() );
    buf.close();
    break;
  case RetrieveFile:
    // retrieve file mode
    if ( file.exists() && !file.remove() ) {
      emit failed();
      mode = Idle;
      return;
    }

    if ( !file.open( IO_WriteOnly) ) {
      emit failed();
      mode = Idle;
      return;
    }
    // odebug << "Debug: Retrieving file " << file.name() << "" << oendl;
    break;
  case RetrieveGzipFile:
    odebug << "=-> starting tar process to receive .tgz file" << oendl;
    break;
  case RetrieveBuffer:
    // retrieve buffer mode
    if ( !buf.open( IO_WriteOnly) ) {
      emit failed();
      mode = Idle;
      return;
    }
    // odebug << "Debug: Retrieving byte array" << oendl;
    break;
  case Idle:
    odebug << "connection established but mode set to Idle; BUG!" << oendl;
    break;
  }
}

void ServerDTP::connectionClosed()
{
    //odebug << "Debug: Data connection closed " << bytes_written << " bytes written" << oendl;

    // send file mode
    if ( SendFile == mode ) {
    if ( bytes_written == file.size() )
        emit completed();
    else
        emit failed();
    }

    // send buffer mode
    else if ( SendBuffer == mode ) {
    if ( bytes_written == buf.size() )
        emit completed();
    else
        emit failed();
    }

    // retrieve file mode
    else if ( RetrieveFile == mode ) {
    file.close();
    if ( recvFileSize >= 0 && (int)file.size() != recvFileSize ) {
        odebug << "STOR incomplete" << oendl;
        file.remove();
        emit failed();
    } else {
        emit completed();
    }
    }

    else if ( RetrieveGzipFile == mode ) {
    odebug << "Done writing ungzip file; closing input" << oendl;
    retrieveTargzProc->flushStdin();
    retrieveTargzProc->closeStdin();
    }

    // retrieve buffer mode
    else if ( RetrieveBuffer == mode ) {
    buf.close();
    emit completed();
    }

    mode = Idle;
}

void ServerDTP::bytesWritten( int bytes )
{
    bytes_written += bytes;

    // send file mode
    if ( SendFile == mode ) {

    if ( bytes_written == file.size() ) {
        // odebug << "Debug: Sending complete: " << file.size() << " bytes" << oendl;
        file.close();
        emit completed();
        mode = Idle;
    }
    else if( !file.atEnd() ) {
        QCString s;
        s.resize( block_size );
        int bytes = file.readBlock( s.data(), block_size );
        writeBlock( s.data(), bytes );
    }
    }

    // send buffer mode
    if ( SendBuffer == mode ) {

    if ( bytes_written == buf.size() ) {
        // odebug << "Debug: Sending complete: " << buf.size() << " bytes" << oendl;
        emit completed();
        mode = Idle;
    }
    }
}

void ServerDTP::readyRead()
{
    // retrieve file mode
    if ( RetrieveFile == mode ) {
    QCString s;
    s.resize( bytesAvailable() );
    readBlock( s.data(), bytesAvailable() );
    file.writeBlock( s.data(), s.size() );
    }
    else if ( RetrieveGzipFile == mode ) {
    if ( !retrieveTargzProc->isRunning() )
        retrieveTargzProc->start();

        QByteArray s;
    s.resize( bytesAvailable() );
    readBlock( s.data(), bytesAvailable() );
    retrieveTargzProc->writeToStdin( s );
    odebug << "wrote " << s.size() << " bytes to ungzip " << oendl;
    }
    // retrieve buffer mode
    else if ( RetrieveBuffer == mode ) {
    QCString s;
    s.resize( bytesAvailable() );
    readBlock( s.data(), bytesAvailable() );
    buf.writeBlock( s.data(), s.size() );
    }
}

void ServerDTP::writeTargzBlock()
{
    QByteArray block = createTargzProc->readStdout();
    writeBlock( block.data(), block.size() );
    odebug << "writeTargzBlock " << block.size() << "" << oendl;
}

void ServerDTP::targzDone()
{
    odebug << "tar and gzip done" << oendl;
    emit completed();
    mode = Idle;
    disconnect( createTargzProc, SIGNAL( readyReadStdout() ),
            this, SLOT( writeTargzBlock() ) );
}

void ServerDTP::sendFile( const QString fn, const QHostAddress& host, Q_UINT16 port )
{
    file.setName( fn );
    mode = SendFile;
    connectToHost( host.toString(), port );
}

void ServerDTP::sendFile( const QString fn )
{
    file.setName( fn );
    mode = SendFile;
}

void ServerDTP::sendGzipFile( const QString &fn,
                  const QStringList &archiveTargets,
                  const QHostAddress& host, Q_UINT16 port )
{
    sendGzipFile( fn, archiveTargets );
    connectToHost( host.toString(), port );
}

void ServerDTP::sendGzipFile( const QString &fn,
                  const QStringList &archiveTargets  )
{
    mode = SendGzipFile;
    file.setName( fn );

    QStringList args = "targzip";
    //args += "-cv";
    args += archiveTargets;
    odebug << "sendGzipFile " << args.join(" ") << "" << oendl;
    createTargzProc->setArguments( args );
    connect( createTargzProc,
         SIGNAL( readyReadStdout() ), SLOT( writeTargzBlock() ) );
}

void ServerDTP::retrieveFile( const QString fn, const QHostAddress& host, Q_UINT16 port, int fileSize )
{
    recvFileSize = fileSize;
    file.setName( fn );
    mode = RetrieveFile;
    connectToHost( host.toString(), port );
}

void ServerDTP::retrieveFile( const QString fn, int fileSize )
{
    recvFileSize = fileSize;
    file.setName( fn );
    mode = RetrieveFile;
}

void ServerDTP::retrieveGzipFile( const QString &fn )
{
    odebug << "retrieveGzipFile " << fn << "" << oendl;
    file.setName( fn );
    mode = RetrieveGzipFile;

    retrieveTargzProc->setArguments( "targunzip" );
    connect( retrieveTargzProc, SIGNAL( processExited() ),
         SLOT( extractTarDone() ) );
}

void ServerDTP::retrieveGzipFile( const QString &fn, const QHostAddress& host, Q_UINT16 port )
{
    retrieveGzipFile( fn );
    connectToHost( host.toString(), port );
}

void ServerDTP::sendByteArray( const QByteArray& array, const QHostAddress& host, Q_UINT16 port )
{
    buf.setBuffer( array );
    mode = SendBuffer;
    connectToHost( host.toString(), port );
}

void ServerDTP::sendByteArray( const QByteArray& array )
{
    buf.setBuffer( array );
    mode = SendBuffer;
}

void ServerDTP::retrieveByteArray( const QHostAddress& host, Q_UINT16 port )
{
    buf.setBuffer( QByteArray() );
    mode = RetrieveBuffer;
    connectToHost( host.toString(), port );
}

void ServerDTP::retrieveByteArray()
{
    buf.setBuffer( QByteArray() );
    mode = RetrieveBuffer;
}

void ServerDTP::setSocket( int socket )
{
    QSocket::setSocket( socket );
    connected();
}

---