File indexing completed on 2024-09-15 03:38:31

 /*
     This file is part of the KDE project
     SPDX-FileCopyrightText: 2004 Jan Schaefer <j_schaef@informatik.uni-kl.de>
 
     SPDX-License-Identifier: LGPL-2.0-only
 */
 
 #include "knfsshare.h"
 
 #include "../utils_p.h"
 
 #include <QDebug>
 #include <QFile>
 #include <QFileInfo>
 #include <QSet>
 #include <QTextStream>
 
 #include "kiocoredebug.h"
 #include <KConfig>
 #include <KConfigGroup>
 #include <KDirWatch>
 
 class Q_DECL_HIDDEN KNFSShare::KNFSSharePrivate
 {
 public:
     explicit KNFSSharePrivate(KNFSShare *parent);
 
     void slotFileChange(const QString &);
 
     bool readExportsFile();
     bool findExportsFile();
 
     KNFSShare *const q;
     QSet<QString> sharedPaths;
     QString exportsFile;
 };
 
 KNFSShare::KNFSSharePrivate::KNFSSharePrivate(KNFSShare *parent)
     : q(parent)
 {
     if (findExportsFile()) {
         readExportsFile();
     }
 }
 
 /**
  * Try to find the nfs config file path
  * First tries the kconfig, then checks
  * several well-known paths
  * @return whether an 'exports' file was found.
  **/
 bool KNFSShare::KNFSSharePrivate::findExportsFile()
 {
     KConfig knfsshare(QStringLiteral("knfsshare"));
     KConfigGroup config(&knfsshare, QStringLiteral("General"));
     exportsFile = config.readPathEntry("exportsFile", QString());
 
     if (!exportsFile.isEmpty() && QFileInfo::exists(exportsFile)) {
         return true;
     }
 
     if (QFile::exists(QStringLiteral("/etc/exports"))) {
         exportsFile = QStringLiteral("/etc/exports");
     } else {
         // qDebug() << "Could not find exports file! /etc/exports doesn't exist. Configure it in share/config/knfsshare, [General], exportsFile=....";
         return false;
     }
 
     config.writeEntry("exportsFile", exportsFile);
     return true;
 }
 
 /**
  * Reads all paths from the exports file
  * and fills the sharedPaths dict with the values
  */
 bool KNFSShare::KNFSSharePrivate::readExportsFile()
 {
     QFile f(exportsFile);
 
     // qDebug() << exportsFile;
 
     if (!f.open(QIODevice::ReadOnly)) {
         qCWarning(KIO_CORE) << "KNFSShare: Could not open" << exportsFile;
         return false;
     }
 
     sharedPaths.clear();
 
     QTextStream s(&f);
 
     bool continuedLine = false; // is true if the line before ended with a backslash
     QString completeLine;
 
     while (!s.atEnd()) {
         QString currentLine = s.readLine().trimmed();
 
         if (continuedLine) {
             completeLine += currentLine;
             continuedLine = false;
         } else {
             completeLine = currentLine;
         }
 
         // is the line continued in the next line ?
         if (completeLine.endsWith(QLatin1Char('\\'))) {
             continuedLine = true;
             // remove the ending backslash
             completeLine.chop(1);
             continue;
         }
 
         // comments or empty lines
         if (completeLine.startsWith(QLatin1Char('#')) || completeLine.isEmpty()) {
             continue;
         }
 
         QString path;
 
         // Handle quotation marks
         if (completeLine[0] == QLatin1Char('\"')) {
             int i = completeLine.indexOf(QLatin1Char('"'), 1);
             if (i == -1) {
                 qCWarning(KIO_CORE) << "KNFSShare: Parse error: Missing quotation mark:" << completeLine;
                 continue;
             }
             path = completeLine.mid(1, i - 1);
 
         } else { // no quotation marks
             int i = completeLine.indexOf(QLatin1Char(' '));
             if (i == -1) {
                 i = completeLine.indexOf(QLatin1Char('\t'));
             }
 
             if (i == -1) {
                 path = completeLine;
             } else {
                 path = completeLine.left(i);
             }
         }
 
         // qDebug() << "KNFSShare: Found path: " << path;
 
         if (!path.isEmpty()) {
             // Append a '/' to normalize path
             Utils::appendSlash(path);
             sharedPaths.insert(path);
         }
     }
 
     return true;
 }
 
 KNFSShare::KNFSShare()
     : d(new KNFSSharePrivate(this))
 {
     if (!d->exportsFile.isEmpty() && QFileInfo::exists(d->exportsFile)) {
         KDirWatch::self()->addFile(d->exportsFile);
         connect(KDirWatch::self(), &KDirWatch::dirty, this, [this](const QString &path) {
             d->slotFileChange(path);
         });
     }
 }
 
 KNFSShare::~KNFSShare() = default;
 
 bool KNFSShare::isDirectoryShared(const QString &path) const
 {
     if (path.isEmpty()) {
         return false;
     }
 
     return d->sharedPaths.contains(Utils::slashAppended(path));
 }
 
 QStringList KNFSShare::sharedDirectories() const
 {
     return d->sharedPaths.values();
 }
 
 QString KNFSShare::exportsPath() const
 {
     return d->exportsFile;
 }
 
 void KNFSShare::KNFSSharePrivate::slotFileChange(const QString &path)
 {
     if (path == exportsFile) {
         readExportsFile();
     }
 
     Q_EMIT q->changed();
 }
 
 class KNFSShareSingleton
 {
 public:
     KNFSShare instance;
 };
 
 Q_GLOBAL_STATIC(KNFSShareSingleton, _instance)
 
 KNFSShare *KNFSShare::instance()
 {
     return &_instance()->instance;
 }
 
 #include "moc_knfsshare.cpp"