File indexing completed on 2023-09-24 04:08:36

 /*
     This file is part of the KDE libraries
     SPDX-FileCopyrightText: 2003 Waldo Bastian <bastian@kde.org>
     SPDX-FileCopyrightText: 2007 David Faure <faure@kde.org>
 
     SPDX-License-Identifier: LGPL-2.0-only
 */
 
 #include "kmountpoint.h"
 
 #include <stdlib.h>
 
 #include "../utils_p.h"
 #include <config-kmountpoint.h>
 #include <kioglobal_p.h> // Defines QT_LSTAT on windows to kio_windows_lstat
 
 #include <QDebug>
 #include <QDir>
 #include <QFile>
 #include <QFileInfo>
 #include <QTextStream>
 
 #include <qplatformdefs.h>
 
 #ifdef Q_OS_WIN
 #include <qt_windows.h>
 static const Qt::CaseSensitivity cs = Qt::CaseInsensitive;
 #else
 static const Qt::CaseSensitivity cs = Qt::CaseSensitive;
 #endif
 
 // This is the *BSD branch
 #if HAVE_SYS_MOUNT_H
 #if HAVE_SYS_PARAM_H
 #include <sys/param.h>
 #endif
 // FreeBSD has a table of names of mount-options in mount.h, which is only
 // defined (as MNTOPT_NAMES) if _WANT_MNTOPTNAMES is defined.
 #define _WANT_MNTOPTNAMES
 #include <sys/mount.h>
 #undef _WANT_MNTOPTNAMES
 #endif
 
 #if HAVE_FSTAB_H
 #include <fstab.h>
 #endif
 
 // Linux
 #if HAVE_LIB_MOUNT
 #include <libmount/libmount.h>
 #endif
 
 static bool isNetfs(const QString &mountType)
 {
     // List copied from util-linux/libmount/src/utils.c
     static const std::vector<QLatin1String> netfsList{
         QLatin1String("cifs"),
         QLatin1String("smb3"),
         QLatin1String("smbfs"),
         QLatin1String("nfs"),
         QLatin1String("nfs3"),
         QLatin1String("nfs4"),
         QLatin1String("afs"),
         QLatin1String("ncpfs"),
         QLatin1String("fuse.curlftpfs"),
         QLatin1String("fuse.sshfs"),
         QLatin1String("9p"),
     };
 
     return std::any_of(netfsList.cbegin(), netfsList.cend(), [mountType](const QLatin1String netfs) {
         return mountType == netfs;
     });
 }
 
 class KMountPointPrivate
 {
 public:
     void resolveGvfsMountPoints(KMountPoint::List &result);
     void finalizePossibleMountPoint(KMountPoint::DetailsNeededFlags infoNeeded);
     void finalizeCurrentMountPoint(KMountPoint::DetailsNeededFlags infoNeeded);
 
     QString m_mountedFrom;
     QString m_device; // Only available when the NeedRealDeviceName flag was set.
     QString m_mountPoint;
     QString m_mountType;
     QStringList m_mountOptions;
     dev_t m_deviceId = 0;
     bool m_isNetFs = false;
 };
 
 KMountPoint::KMountPoint()
     : d(new KMountPointPrivate)
 {
 }
 
 KMountPoint::~KMountPoint() = default;
 
 #if HAVE_GETMNTINFO
 
 #ifdef MNTOPT_NAMES
 static struct mntoptnames bsdOptionNames[] = {MNTOPT_NAMES};
 
 /** @brief Get mount options from @p flags and puts human-readable version in @p list
  *
  * Appends all positive options found in @p flags to the @p list
  * This is roughly paraphrased from FreeBSD's mount.c, prmount().
  */
 static void translateMountOptions(QStringList &list, uint64_t flags)
 {
     const struct mntoptnames *optionInfo = bsdOptionNames;
 
     // Not all 64 bits are useful option names
     flags = flags & MNT_VISFLAGMASK;
     // Chew up options as long as we're in the table and there
     // are any flags left.
     for (; flags != 0 && optionInfo->o_opt != 0; ++optionInfo) {
         if (flags & optionInfo->o_opt) {
             list.append(QString::fromLatin1(optionInfo->o_name));
             flags &= ~optionInfo->o_opt;
         }
     }
 }
 #else
 /** @brief Get mount options from @p flags and puts human-readable version in @p list
  *
  * This default version just puts the hex representation of @p flags
  * in the list, because there is no human-readable version.
  */
 static void translateMountOptions(QStringList &list, uint64_t flags)
 {
     list.append(QStringLiteral("0x%1").arg(QString::number(flags, 16)));
 }
 #endif
 
 #endif // HAVE_GETMNTINFO
 
 void KMountPointPrivate::finalizePossibleMountPoint(KMountPoint::DetailsNeededFlags infoNeeded)
 {
     QString potentialDevice;
     if (const auto tag = QLatin1String("UUID="); m_mountedFrom.startsWith(tag)) {
         potentialDevice = QFile::symLinkTarget(QLatin1String("/dev/disk/by-uuid/") + QStringView(m_mountedFrom).mid(tag.size()));
     } else if (const auto tag = QLatin1String("LABEL="); m_mountedFrom.startsWith(tag)) {
         potentialDevice = QFile::symLinkTarget(QLatin1String("/dev/disk/by-label/") + QStringView(m_mountedFrom).mid(tag.size()));
     }
 
     if (QFile::exists(potentialDevice)) {
         m_mountedFrom = potentialDevice;
     }
 
     if (infoNeeded & KMountPoint::NeedRealDeviceName) {
         if (m_mountedFrom.startsWith(QLatin1Char('/'))) {
             m_device = QFileInfo(m_mountedFrom).canonicalFilePath();
         }
     }
 
     // Chop trailing slash
     Utils::removeTrailingSlash(m_mountedFrom);
 }
 
 void KMountPointPrivate::finalizeCurrentMountPoint(KMountPoint::DetailsNeededFlags infoNeeded)
 {
     if (infoNeeded & KMountPoint::NeedRealDeviceName) {
         if (m_mountedFrom.startsWith(QLatin1Char('/'))) {
             m_device = QFileInfo(m_mountedFrom).canonicalFilePath();
         }
     }
 }
 
 KMountPoint::List KMountPoint::possibleMountPoints(DetailsNeededFlags infoNeeded)
 {
     KMountPoint::List result;
 
 #ifdef Q_OS_WIN
     result = KMountPoint::currentMountPoints(infoNeeded);
 
 #elif HAVE_LIB_MOUNT
     if (struct libmnt_table *table = mnt_new_table()) {
         // By default parses "/etc/fstab"
         if (mnt_table_parse_fstab(table, nullptr) == 0) {
             struct libmnt_iter *itr = mnt_new_iter(MNT_ITER_FORWARD);
             struct libmnt_fs *fs;
 
             while (mnt_table_next_fs(table, itr, &fs) == 0) {
                 const char *fsType = mnt_fs_get_fstype(fs);
                 if (qstrcmp(fsType, "swap") == 0) {
                     continue;
                 }
 
                 Ptr mp(new KMountPoint);
                 mp->d->m_mountType = QFile::decodeName(fsType);
                 const char *target = mnt_fs_get_target(fs);
                 mp->d->m_mountPoint = QFile::decodeName(target);
 
                 if (QT_STATBUF buff; QT_LSTAT(target, &buff) == 0) {
                     mp->d->m_deviceId = buff.st_dev;
                 }
 
                 // First field in /etc/fstab, e.g. /dev/sdXY, LABEL=, UUID=, /some/bind/mount/dir
                 // or some network mount
                 if (const char *source = mnt_fs_get_source(fs)) {
                     mp->d->m_mountedFrom = QFile::decodeName(source);
                 }
 
                 if (infoNeeded & NeedMountOptions) {
                     mp->d->m_mountOptions = QFile::decodeName(mnt_fs_get_options(fs)).split(QLatin1Char(','));
                 }
 
                 mp->d->finalizePossibleMountPoint(infoNeeded);
                 result.append(mp);
             }
             mnt_free_iter(itr);
         }
 
         mnt_free_table(table);
     }
 #elif HAVE_FSTAB_H
 
     QFile f{QLatin1String(FSTAB)};
     if (!f.open(QIODevice::ReadOnly)) {
         return result;
     }
 
     QTextStream t(&f);
     QString s;
 
     while (!t.atEnd()) {
         s = t.readLine().simplified();
         if (s.isEmpty() || (s[0] == QLatin1Char('#'))) {
             continue;
         }
 
         // not empty or commented out by '#'
         const QStringList item = s.split(QLatin1Char(' '));
 
         if (item.count() < 4) {
             continue;
         }
 
         Ptr mp(new KMountPoint);
 
         int i = 0;
         mp->d->m_mountedFrom = item[i++];
         mp->d->m_mountPoint = item[i++];
         mp->d->m_mountType = item[i++];
         if (mp->d->m_mountType == QLatin1String("swap")) {
             continue;
         }
         QString options = item[i++];
 
         if (infoNeeded & NeedMountOptions) {
             mp->d->m_mountOptions = options.split(QLatin1Char(','));
         }
 
         mp->d->finalizePossibleMountPoint(infoNeeded);
 
         result.append(mp);
     } // while
 
     f.close();
 #endif
 
     return result;
 }
 
 void KMountPointPrivate::resolveGvfsMountPoints(KMountPoint::List &result)
 {
     if (m_mountedFrom == QLatin1String("gvfsd-fuse")) {
         const QDir gvfsDir(m_mountPoint);
         const QStringList mountDirs = gvfsDir.entryList(QDir::Dirs | QDir::NoDotAndDotDot);
         for (const QString &mountDir : mountDirs) {
             const QString type = mountDir.section(QLatin1Char(':'), 0, 0);
             if (type.isEmpty()) {
                 continue;
             }
 
             KMountPoint::Ptr gvfsmp(new KMountPoint);
             gvfsmp->d->m_mountedFrom = m_mountedFrom;
             gvfsmp->d->m_mountPoint = m_mountPoint + QLatin1Char('/') + mountDir;
             gvfsmp->d->m_mountType = type;
             result.append(gvfsmp);
         }
     }
 }
 
 KMountPoint::List KMountPoint::currentMountPoints(DetailsNeededFlags infoNeeded)
 {
     KMountPoint::List result;
 
 #if HAVE_GETMNTINFO
 
 #if GETMNTINFO_USES_STATVFS
     struct statvfs *mounted;
 #else
     struct statfs *mounted;
 #endif
 
     int num_fs = getmntinfo(&mounted, MNT_NOWAIT);
 
     result.reserve(num_fs);
 
     for (int i = 0; i < num_fs; i++) {
         Ptr mp(new KMountPoint);
         mp->d->m_mountedFrom = QFile::decodeName(mounted[i].f_mntfromname);
         mp->d->m_mountPoint = QFile::decodeName(mounted[i].f_mntonname);
         mp->d->m_mountType = QFile::decodeName(mounted[i].f_fstypename);
 
         if (QT_STATBUF buff; QT_LSTAT(mounted[i].f_mntonname, &buff) == 0) {
             mp->d->m_deviceId = buff.st_dev;
         }
 
         if (infoNeeded & NeedMountOptions) {
             struct fstab *ft = getfsfile(mounted[i].f_mntonname);
             if (ft != nullptr) {
                 QString options = QFile::decodeName(ft->fs_mntops);
                 mp->d->m_mountOptions = options.split(QLatin1Char(','));
             } else {
                 translateMountOptions(mp->d->m_mountOptions, mounted[i].f_flags);
             }
         }
 
         mp->d->finalizeCurrentMountPoint(infoNeeded);
         // TODO: Strip trailing '/' ?
         result.append(mp);
     }
 
 #elif defined(Q_OS_WIN)
     // nothing fancy with infoNeeded but it gets the job done
     DWORD bits = GetLogicalDrives();
     if (!bits) {
         return result;
     }
 
     for (int i = 0; i < 26; i++) {
         if (bits & (1 << i)) {
             Ptr mp(new KMountPoint);
             mp->d->m_mountPoint = QString(QLatin1Char('A' + i) + QLatin1String(":/"));
             result.append(mp);
         }
     }
 
 #elif HAVE_LIB_MOUNT
     if (struct libmnt_table *table = mnt_new_table()) {
         // if "/etc/mtab" is a regular file,
         // "/etc/mtab" is used by default instead of "/proc/self/mountinfo" file.
         // This leads to NTFS mountpoints being hidden.
         if (mnt_table_parse_mtab(table, "/proc/self/mountinfo") == 0) {
             struct libmnt_iter *itr = mnt_new_iter(MNT_ITER_FORWARD);
             struct libmnt_fs *fs;
 
             while (mnt_table_next_fs(table, itr, &fs) == 0) {
                 Ptr mp(new KMountPoint);
                 mp->d->m_mountedFrom = QFile::decodeName(mnt_fs_get_source(fs));
                 mp->d->m_mountPoint = QFile::decodeName(mnt_fs_get_target(fs));
                 mp->d->m_mountType = QFile::decodeName(mnt_fs_get_fstype(fs));
                 mp->d->m_isNetFs = mnt_fs_is_netfs(fs) == 1;
                 mp->d->m_deviceId = mnt_fs_get_devno(fs);
 
                 if (infoNeeded & NeedMountOptions) {
                     mp->d->m_mountOptions = QFile::decodeName(mnt_fs_get_options(fs)).split(QLatin1Char(','));
                 }
 
                 if (infoNeeded & NeedRealDeviceName) {
                     if (mp->d->m_mountedFrom.startsWith(QLatin1Char('/'))) {
                         mp->d->m_device = mp->d->m_mountedFrom;
                     }
                 }
 
                 mp->d->resolveGvfsMountPoints(result);
 
                 mp->d->finalizeCurrentMountPoint(infoNeeded);
                 result.push_back(mp);
             }
 
             mnt_free_iter(itr);
         }
 
         mnt_free_table(table);
     }
 #endif
 
     return result;
 }
 
 QString KMountPoint::mountedFrom() const
 {
     return d->m_mountedFrom;
 }
 
 dev_t KMountPoint::deviceId() const
 {
     return d->m_deviceId;
 }
 
 bool KMountPoint::isOnNetwork() const
 {
     return d->m_isNetFs || isNetfs(d->m_mountType);
 }
 
 QString KMountPoint::realDeviceName() const
 {
     return d->m_device;
 }
 
 QString KMountPoint::mountPoint() const
 {
     return d->m_mountPoint;
 }
 
 QString KMountPoint::mountType() const
 {
     return d->m_mountType;
 }
 
 QStringList KMountPoint::mountOptions() const
 {
     return d->m_mountOptions;
 }
 
 KMountPoint::List::List()
     : QList<Ptr>()
 {
 }
 
 KMountPoint::Ptr KMountPoint::List::findByPath(const QString &path) const
 {
 #ifdef Q_OS_WIN
     const QString realPath = QDir::fromNativeSeparators(QDir(path).absolutePath());
 #else
     /* If the path contains symlinks, get the real name */
     QFileInfo fileinfo(path);
     // canonicalFilePath won't work unless file exists
     const QString realPath = fileinfo.exists() ? fileinfo.canonicalFilePath() : fileinfo.absolutePath();
 #endif
 
     KMountPoint::Ptr result;
 
     if (QT_STATBUF buff; QT_LSTAT(QFile::encodeName(realPath).constData(), &buff) == 0) {
         auto it = std::find_if(this->cbegin(), this->cend(), [&buff, &realPath](const KMountPoint::Ptr &mountPtr) {
             // For a bind mount, the deviceId() is that of the base mount point, e.g. /mnt/foo,
             // however the path we're looking for, e.g. /home/user/bar, doesn't start with the
             // mount point of the base device, so we go on searching
             return mountPtr->deviceId() == buff.st_dev && realPath.startsWith(mountPtr->mountPoint());
         });
 
         if (it != this->cend()) {
             result = *it;
         }
     }
 
     return result;
 }
 
 KMountPoint::Ptr KMountPoint::List::findByDevice(const QString &device) const
 {
     const QString realDevice = QFileInfo(device).canonicalFilePath();
     if (realDevice.isEmpty()) { // d->m_device can be empty in the loop below, don't match empty with it
         return Ptr();
     }
     for (const KMountPoint::Ptr &mountPoint : *this) {
         if (realDevice.compare(mountPoint->d->m_device, cs) == 0 || realDevice.compare(mountPoint->d->m_mountedFrom, cs) == 0) {
             return mountPoint;
         }
     }
     return Ptr();
 }
 
 bool KMountPoint::probablySlow() const
 {
     /* clang-format off */
     return isOnNetwork()
         || d->m_mountType == QLatin1String("autofs")
         || d->m_mountType == QLatin1String("subfs")
         // Technically KIOFUSe mounts local workers as well,
         // such as recents:/, but better safe than sorry...
         || d->m_mountType == QLatin1String("fuse.kio-fuse");
     /* clang-format on */
 }
 
 bool KMountPoint::testFileSystemFlag(FileSystemFlag flag) const
 {
     /* clang-format off */
     const bool isMsDos = d->m_mountType == QLatin1String("msdos")
                          || d->m_mountType == QLatin1String("fat")
                          || d->m_mountType == QLatin1String("vfat");
 
     const bool isNtfs = d->m_mountType.contains(QLatin1String("fuse.ntfs"))
                         || d->m_mountType.contains(QLatin1String("fuseblk.ntfs"))
                         // fuseblk could really be anything. But its most common use is for NTFS mounts, these days.
                         || d->m_mountType == QLatin1String("fuseblk");
 
     const bool isSmb = d->m_mountType == QLatin1String("cifs")
                        || d->m_mountType == QLatin1String("smb3")
                        || d->m_mountType == QLatin1String("smbfs")
                        // gvfs-fuse mounted SMB share
                        || d->m_mountType == QLatin1String("smb-share");
     /* clang-format on */
 
     switch (flag) {
     case SupportsChmod:
     case SupportsChown:
     case SupportsUTime:
     case SupportsSymlinks:
         return !isMsDos && !isNtfs && !isSmb; // it's amazing the number of things Microsoft filesystems don't support :)
     case CaseInsensitive:
         return isMsDos;
     }
     return false;
 }
 
 KIOCORE_EXPORT QDebug operator<<(QDebug debug, const KMountPoint::Ptr &mp)
 {
     QDebugStateSaver saver(debug);
     if (!mp) {
         debug << "QDebug operator<< called on a null KMountPoint::Ptr";
         return debug;
     }
 
     // clang-format off
     debug.nospace() << "KMountPoint ["
                     << "Mounted from: "  << mp->d->m_mountedFrom
                     << ", device name: " << mp->d->m_device
                     << ", mount point: " << mp->d->m_mountPoint
                     << ", mount type: "  << mp->d->m_mountType
                     <<']';
 
     // clang-format on
     return debug;
 }