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/****************************************************************************
**
** Copyright (C) 2014 Ivan Komissarov <ABBAPOH@gmail.com>
** Copyright (C) 2016 Intel Corporation.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qstorageinfo_p.h"
#include <QtCore/qdiriterator.h>
#include <QtCore/qfileinfo.h>
#include <QtCore/qtextstream.h>
#include <QtCore/private/qcore_unix_p.h>
#include <QtCore/private/qlocale_tools_p.h>
#include <errno.h>
#include <sys/stat.h>
#if defined(Q_OS_BSD4)
# include <sys/mount.h>
# include <sys/statvfs.h>
#elif defined(Q_OS_ANDROID)
# include <sys/mount.h>
# include <sys/vfs.h>
# include <mntent.h>
#elif defined(Q_OS_LINUX) || defined(Q_OS_HURD)
# include <mntent.h>
# include <sys/statvfs.h>
# include <sys/sysmacros.h>
#elif defined(Q_OS_SOLARIS)
# include <sys/mnttab.h>
# include <sys/statvfs.h>
#elif defined(Q_OS_HAIKU)
# include <Directory.h>
# include <Path.h>
# include <Volume.h>
# include <VolumeRoster.h>
# include <fs_info.h>
# include <sys/statvfs.h>
#else
# include <sys/statvfs.h>
#endif
#if defined(Q_OS_BSD4)
# if defined(Q_OS_NETBSD)
# define QT_STATFSBUF struct statvfs
# define QT_STATFS ::statvfs
# else
# define QT_STATFSBUF struct statfs
# define QT_STATFS ::statfs
# endif
# if !defined(ST_RDONLY)
# define ST_RDONLY MNT_RDONLY
# endif
# if !defined(_STATFS_F_FLAGS) && !defined(Q_OS_NETBSD)
# define _STATFS_F_FLAGS 1
# endif
#elif defined(Q_OS_ANDROID)
# define QT_STATFS ::statfs
# define QT_STATFSBUF struct statfs
# if !defined(ST_RDONLY)
# define ST_RDONLY 1 // hack for missing define on Android
# endif
#elif defined(Q_OS_HAIKU)
# define QT_STATFSBUF struct statvfs
# define QT_STATFS ::statvfs
#else
# if defined(QT_LARGEFILE_SUPPORT)
# define QT_STATFSBUF struct statvfs64
# define QT_STATFS ::statvfs64
# else
# define QT_STATFSBUF struct statvfs
# define QT_STATFS ::statvfs
# endif // QT_LARGEFILE_SUPPORT
#endif // Q_OS_BSD4
#if __has_include(<paths.h>)
# include <paths.h>
#endif
#ifndef _PATH_MOUNTED
# define _PATH_MOUNTED "/etc/mnttab"
#endif
QT_BEGIN_NAMESPACE
class QStorageIterator
{
public:
QStorageIterator();
~QStorageIterator();
inline bool isValid() const;
inline bool next();
inline QString rootPath() const;
inline QByteArray fileSystemType() const;
inline QByteArray device() const;
inline QByteArray options() const;
inline QByteArray subvolume() const;
private:
#if defined(Q_OS_BSD4)
QT_STATFSBUF *stat_buf;
int entryCount;
int currentIndex;
#elif defined(Q_OS_SOLARIS)
FILE *fp;
mnttab mnt;
#elif defined(Q_OS_ANDROID)
QFile file;
QByteArray m_rootPath;
QByteArray m_fileSystemType;
QByteArray m_device;
QByteArray m_options;
#elif defined(Q_OS_LINUX) || defined(Q_OS_HURD)
struct mountinfoent : public mntent {
// Details from proc(5) section from /proc/<pid>/mountinfo:
//(1) mount ID: a unique ID for the mount (may be reused after umount(2)).
int mount_id;
//(2) parent ID: the ID of the parent mount (or of self for the top of the mount tree).
// int parent_id;
//(3) major:minor: the value of st_dev for files on this filesystem (see stat(2)).
dev_t rdev;
//(4) root: the pathname of the directory in the filesystem which forms the root of this mount.
char *subvolume;
//(5) mount point: the pathname of the mount point relative to the process's root directory.
// char *mnt_dir; // in mntent
//(6) mount options: per-mount options.
// char *mnt_opts; // in mntent
//(7) optional fields: zero or more fields of the form "tag[:value]"; see below.
// int flags;
//(8) separator: the end of the optional fields is marked by a single hyphen.
//(9) filesystem type: the filesystem type in the form "type[.subtype]".
// char *mnt_type; // in mntent
//(10) mount source: filesystem-specific information or "none".
// char *mnt_fsname; // in mntent
//(11) super options: per-superblock options.
char *superopts;
};
FILE *fp;
QByteArray buffer;
mountinfoent mnt;
bool usingMountinfo;
#elif defined(Q_OS_HAIKU)
BVolumeRoster m_volumeRoster;
QByteArray m_rootPath;
QByteArray m_fileSystemType;
QByteArray m_device;
#endif
};
template <typename String>
static bool isParentOf(const String &parent, const QString &dirName)
{
return dirName.startsWith(parent) &&
(dirName.size() == parent.size() || dirName.at(parent.size()) == QLatin1Char('/') ||
parent.size() == 1);
}
static bool shouldIncludeFs(const QStorageIterator &it)
{
/*
* This function implements a heuristic algorithm to determine whether a
* given mount should be reported to the user. Our objective is to list
* only entries that the end-user would find useful.
*
* We therefore ignore:
* - mounted in /dev, /proc, /sys: special mounts
* (this will catch /sys/fs/cgroup, /proc/sys/fs/binfmt_misc, /dev/pts,
* some of which are tmpfs on Linux)
* - mounted in /var/run or /var/lock: most likely pseudofs
* (on earlier systemd versions, /var/run was a bind-mount of /run, so
* everything would be unnecessarily duplicated)
* - filesystem type is "rootfs": artifact of the root-pivot on some Linux
* initrd
* - if the filesystem total size is zero, it's a pseudo-fs (not checked here).
*/
QString mountDir = it.rootPath();
if (isParentOf(QLatin1String("/dev"), mountDir)
|| isParentOf(QLatin1String("/proc"), mountDir)
|| isParentOf(QLatin1String("/sys"), mountDir)
|| isParentOf(QLatin1String("/var/run"), mountDir)
|| isParentOf(QLatin1String("/var/lock"), mountDir)) {
return false;
}
#if defined(Q_OS_LINUX) && !defined(Q_OS_ANDROID)
if (it.fileSystemType() == "rootfs")
return false;
#endif
// size checking in mountedVolumes()
return true;
}
#if defined(Q_OS_BSD4)
#ifndef MNT_NOWAIT
# define MNT_NOWAIT 0
#endif
inline QStorageIterator::QStorageIterator()
: entryCount(::getmntinfo(&stat_buf, MNT_NOWAIT)),
currentIndex(-1)
{
}
inline QStorageIterator::~QStorageIterator()
{
}
inline bool QStorageIterator::isValid() const
{
return entryCount != -1;
}
inline bool QStorageIterator::next()
{
return ++currentIndex < entryCount;
}
inline QString QStorageIterator::rootPath() const
{
return QFile::decodeName(stat_buf[currentIndex].f_mntonname);
}
inline QByteArray QStorageIterator::fileSystemType() const
{
return QByteArray(stat_buf[currentIndex].f_fstypename);
}
inline QByteArray QStorageIterator::device() const
{
return QByteArray(stat_buf[currentIndex].f_mntfromname);
}
inline QByteArray QStorageIterator::options() const
{
return QByteArray();
}
inline QByteArray QStorageIterator::subvolume() const
{
return QByteArray();
}
#elif defined(Q_OS_SOLARIS)
inline QStorageIterator::QStorageIterator()
{
const int fd = qt_safe_open(_PATH_MOUNTED, O_RDONLY);
fp = ::fdopen(fd, "r");
}
inline QStorageIterator::~QStorageIterator()
{
if (fp)
::fclose(fp);
}
inline bool QStorageIterator::isValid() const
{
return fp != nullptr;
}
inline bool QStorageIterator::next()
{
return ::getmntent(fp, &mnt) == 0;
}
inline QString QStorageIterator::rootPath() const
{
return QFile::decodeName(mnt.mnt_mountp);
}
inline QByteArray QStorageIterator::fileSystemType() const
{
return QByteArray(mnt.mnt_fstype);
}
inline QByteArray QStorageIterator::device() const
{
return QByteArray(mnt.mnt_mntopts);
}
inline QByteArray QStorageIterator::subvolume() const
{
return QByteArray();
}
#elif defined(Q_OS_ANDROID)
inline QStorageIterator::QStorageIterator()
{
file.setFileName(_PATH_MOUNTED);
file.open(QIODevice::ReadOnly | QIODevice::Text);
}
inline QStorageIterator::~QStorageIterator()
{
}
inline bool QStorageIterator::isValid() const
{
return file.isOpen();
}
inline bool QStorageIterator::next()
{
QList<QByteArray> data;
// If file is virtual, file.readLine() may succeed even when file.atEnd().
do {
const QByteArray line = file.readLine();
if (line.isEmpty() && file.atEnd())
return false;
data = line.split(' ');
} while (data.count() < 4);
m_device = data.at(0);
m_rootPath = data.at(1);
m_fileSystemType = data.at(2);
m_options = data.at(3);
return true;
}
inline QString QStorageIterator::rootPath() const
{
return QFile::decodeName(m_rootPath);
}
inline QByteArray QStorageIterator::fileSystemType() const
{
return m_fileSystemType;
}
inline QByteArray QStorageIterator::device() const
{
return m_device;
}
inline QByteArray QStorageIterator::options() const
{
return m_options;
}
inline QByteArray QStorageIterator::subvolume() const
{
return QByteArray();
}
#elif defined(Q_OS_LINUX) || defined(Q_OS_HURD)
static const int bufferSize = 1024; // 2 paths (mount point+device) and metainfo;
// should be enough
inline QStorageIterator::QStorageIterator() :
buffer(QByteArray(bufferSize, 0))
{
fp = nullptr;
#ifdef Q_OS_LINUX
// first, try to open /proc/self/mountinfo, which has more details
fp = ::fopen("/proc/self/mountinfo", "re");
#endif
if (fp) {
usingMountinfo = true;
} else {
usingMountinfo = false;
fp = ::setmntent(_PATH_MOUNTED, "r");
}
}
inline QStorageIterator::~QStorageIterator()
{
if (fp) {
if (usingMountinfo)
::fclose(fp);
else
::endmntent(fp);
}
}
inline bool QStorageIterator::isValid() const
{
return fp != nullptr;
}
inline bool QStorageIterator::next()
{
mnt.subvolume = nullptr;
mnt.superopts = nullptr;
if (!usingMountinfo)
return ::getmntent_r(fp, &mnt, buffer.data(), buffer.size()) != nullptr;
// Helper function to parse paths that the kernel inserts escape sequences
// for. The unescaped string is left at \a src and is properly
// NUL-terminated. Returns a pointer to the delimiter that terminated the
// path, or nullptr if it failed.
auto parseMangledPath = [](char *src) {
// The kernel escapes with octal the following characters:
// space ' ', tab '\t', backslask '\\', and newline '\n'
char *dst = src;
while (*src) {
switch (*src) {
case ' ':
// Unescaped space: end of the field.
*dst = '\0';
return src;
default:
*dst++ = *src++;
break;
case '\\':
// It always uses exactly three octal characters.
++src;
char c = (*src++ - '0') << 6;
c |= (*src++ - '0') << 3;
c |= (*src++ - '0');
*dst++ = c;
break;
}
}
// Found a NUL before the end of the field.
src = nullptr;
return src;
};
char *ptr = buffer.data();
if (fgets(ptr, buffer.size(), fp) == nullptr)
return false;
size_t len = strlen(buffer.data());
if (len == 0)
return false;
while (Q_UNLIKELY(ptr[len - 1] != '\n' && !feof(fp))) {
// buffer wasn't large enough. Enlarge and try again.
// (we're readidng from the kernel, so OOM is unlikely)
buffer.resize((buffer.size() + 4096) & ~4095);
ptr = buffer.data();
if (fgets(ptr + len, buffer.size() - len, fp) == nullptr)
return false;
len += strlen(ptr + len);
Q_ASSERT(len < size_t(buffer.size()));
}
ptr[len - 1] = '\0';
// parse the line
bool ok;
mnt.mnt_freq = 0;
mnt.mnt_passno = 0;
mnt.mount_id = qstrtoll(ptr, const_cast<const char **>(&ptr), 10, &ok);
if (!ptr || !ok)
return false;
int parent_id = qstrtoll(ptr, const_cast<const char **>(&ptr), 10, &ok);
Q_UNUSED(parent_id);
if (!ptr || !ok)
return false;
int rdevmajor = qstrtoll(ptr, const_cast<const char **>(&ptr), 10, &ok);
if (!ptr || !ok)
return false;
if (*ptr != ':')
return false;
int rdevminor = qstrtoll(ptr + 1, const_cast<const char **>(&ptr), 10, &ok);
if (!ptr || !ok)
return false;
mnt.rdev = makedev(rdevmajor, rdevminor);
if (*ptr != ' ')
return false;
mnt.subvolume = ++ptr;
ptr = parseMangledPath(ptr);
if (!ptr)
return false;
// unset a subvolume of "/" -- it's not a *sub* volume
if (mnt.subvolume + 1 == ptr)
*mnt.subvolume = '\0';
mnt.mnt_dir = ++ptr;
ptr = parseMangledPath(ptr);
if (!ptr)
return false;
mnt.mnt_opts = ++ptr;
ptr = strchr(ptr, ' ');
if (!ptr)
return false;
// we don't parse the flags, so just find the separator
if (char *const dashed = strstr(ptr, " - ")) {
*ptr = '\0';
ptr = dashed + strlen(" - ") - 1;
} else {
return false;
}
mnt.mnt_type = ++ptr;
ptr = strchr(ptr, ' ');
if (!ptr)
return false;
*ptr = '\0';
mnt.mnt_fsname = ++ptr;
ptr = parseMangledPath(ptr);
if (!ptr)
return false;
mnt.superopts = ++ptr;
ptr += strcspn(ptr, " \n");
*ptr = '\0';
return true;
}
inline QString QStorageIterator::rootPath() const
{
return QFile::decodeName(mnt.mnt_dir);
}
inline QByteArray QStorageIterator::fileSystemType() const
{
return QByteArray(mnt.mnt_type);
}
inline QByteArray QStorageIterator::device() const
{
#ifdef Q_OS_LINUX
// check that the device exists
if (mnt.mnt_fsname[0] == '/' && access(mnt.mnt_fsname, F_OK) != 0) {
// It doesn't, so let's try to resolve the dev_t from /dev/block.
// Note how strlen("4294967295") == digits10 + 1, so we need to add 1
// for each number, plus the ':'.
char buf[sizeof("/dev/block/") + 2 * std::numeric_limits<unsigned>::digits10 + 3];
QByteArray dev(PATH_MAX, Qt::Uninitialized);
char *devdata = dev.data();
snprintf(buf, sizeof(buf), "/dev/block/%u:%u", major(mnt.rdev), minor(mnt.rdev));
if (realpath(buf, devdata)) {
dev.truncate(strlen(devdata));
return dev;
}
}
#endif
return QByteArray(mnt.mnt_fsname);
}
inline QByteArray QStorageIterator::options() const
{
// Merge the two options, starting with the superblock options and letting
// the per-mount options override.
const char *superopts = mnt.superopts;
// Both mnt_opts and superopts start with "ro" or "rw", so we can skip the
// superblock's field (see show_mountinfo() in fs/proc_namespace.c).
if (superopts && superopts[0] == 'r') {
if (superopts[2] == '\0') // no other superopts besides "ro" / "rw"?
superopts = nullptr;
else if (superopts[2] == ',')
superopts += 3;
}
if (superopts)
return QByteArray(superopts) + ',' + mnt.mnt_opts;
return QByteArray(mnt.mnt_opts);
}
inline QByteArray QStorageIterator::subvolume() const
{
return QByteArray(mnt.subvolume);
}
#elif defined(Q_OS_HAIKU)
inline QStorageIterator::QStorageIterator()
{
}
inline QStorageIterator::~QStorageIterator()
{
}
inline bool QStorageIterator::isValid() const
{
return true;
}
inline bool QStorageIterator::next()
{
BVolume volume;
if (m_volumeRoster.GetNextVolume(&volume) != B_OK)
return false;
BDirectory directory;
if (volume.GetRootDirectory(&directory) != B_OK)
return false;
const BPath path(&directory);
fs_info fsInfo;
memset(&fsInfo, 0, sizeof(fsInfo));
if (fs_stat_dev(volume.Device(), &fsInfo) != 0)
return false;
m_rootPath = path.Path();
m_fileSystemType = QByteArray(fsInfo.fsh_name);
const QByteArray deviceName(fsInfo.device_name);
m_device = (deviceName.isEmpty() ? QByteArray::number(qint32(volume.Device())) : deviceName);
return true;
}
inline QString QStorageIterator::rootPath() const
{
return QFile::decodeName(m_rootPath);
}
inline QByteArray QStorageIterator::fileSystemType() const
{
return m_fileSystemType;
}
inline QByteArray QStorageIterator::device() const
{
return m_device;
}
inline QByteArray QStorageIterator::options() const
{
return QByteArray();
}
inline QByteArray QStorageIterator::subvolume() const
{
return QByteArray();
}
#else
inline QStorageIterator::QStorageIterator()
{
}
inline QStorageIterator::~QStorageIterator()
{
}
inline bool QStorageIterator::isValid() const
{
return false;
}
inline bool QStorageIterator::next()
{
return false;
}
inline QString QStorageIterator::rootPath() const
{
return QString();
}
inline QByteArray QStorageIterator::fileSystemType() const
{
return QByteArray();
}
inline QByteArray QStorageIterator::device() const
{
return QByteArray();
}
inline QByteArray QStorageIterator::options() const
{
return QByteArray();
}
inline QByteArray QStorageIterator::subvolume() const
{
return QByteArray();
}
#endif
void QStorageInfoPrivate::initRootPath()
{
rootPath = QFileInfo(rootPath).canonicalFilePath();
if (rootPath.isEmpty())
return;
QStorageIterator it;
if (!it.isValid()) {
rootPath = QStringLiteral("/");
return;
}
int maxLength = 0;
const QString oldRootPath = rootPath;
rootPath.clear();
while (it.next()) {
const QString mountDir = it.rootPath();
const QByteArray fsName = it.fileSystemType();
// we try to find most suitable entry
if (isParentOf(mountDir, oldRootPath) && maxLength < mountDir.length()) {
maxLength = mountDir.length();
rootPath = mountDir;
device = it.device();
fileSystemType = fsName;
subvolume = it.subvolume();
}
}
}
#ifdef Q_OS_LINUX
// udev encodes the labels with ID_LABEL_FS_ENC which is done with
// blkid_encode_string(). Within this function some 1-byte utf-8
// characters not considered safe (e.g. '\' or ' ') are encoded as hex
static QString decodeFsEncString(const QString &str)
{
QString decoded;
decoded.reserve(str.size());
int i = 0;
while (i < str.size()) {
if (i <= str.size() - 4) { // we need at least four characters \xAB
if (str.at(i) == QLatin1Char('\\') &&
str.at(i+1) == QLatin1Char('x')) {
bool bOk;
const int code = str.midRef(i+2, 2).toInt(&bOk, 16);
// only decode characters between 0x20 and 0x7f but not
// the backslash to prevent collisions
if (bOk && code >= 0x20 && code < 0x80 && code != '\\') {
decoded += QChar(code);
i += 4;
continue;
}
}
}
decoded += str.at(i);
++i;
}
return decoded;
}
#endif
static inline QString retrieveLabel(const QByteArray &device)
{
#ifdef Q_OS_LINUX
static const char pathDiskByLabel[] = "/dev/disk/by-label";
QFileInfo devinfo(QFile::decodeName(device));
QString devicePath = devinfo.canonicalFilePath();
QDirIterator it(QLatin1String(pathDiskByLabel), QDir::NoDotAndDotDot);
while (it.hasNext()) {
it.next();
QFileInfo fileInfo(it.fileInfo());
if (fileInfo.isSymLink() && fileInfo.symLinkTarget() == devicePath)
return decodeFsEncString(fileInfo.fileName());
}
#elif defined Q_OS_HAIKU
fs_info fsInfo;
memset(&fsInfo, 0, sizeof(fsInfo));
int32 pos = 0;
dev_t dev;
while ((dev = next_dev(&pos)) >= 0) {
if (fs_stat_dev(dev, &fsInfo) != 0)
continue;
if (qstrcmp(fsInfo.device_name, device.constData()) == 0)
return QString::fromLocal8Bit(fsInfo.volume_name);
}
#else
Q_UNUSED(device);
#endif
return QString();
}
void QStorageInfoPrivate::doStat()
{
initRootPath();
if (rootPath.isEmpty())
return;
retrieveVolumeInfo();
name = retrieveLabel(device);
}
void QStorageInfoPrivate::retrieveVolumeInfo()
{
QT_STATFSBUF statfs_buf;
int result;
EINTR_LOOP(result, QT_STATFS(QFile::encodeName(rootPath).constData(), &statfs_buf));
if (result == 0) {
valid = true;
ready = true;
#if defined(Q_OS_INTEGRITY) || (defined(Q_OS_BSD4) && !defined(Q_OS_NETBSD)) || defined(Q_OS_RTEMS)
bytesTotal = statfs_buf.f_blocks * statfs_buf.f_bsize;
bytesFree = statfs_buf.f_bfree * statfs_buf.f_bsize;
bytesAvailable = statfs_buf.f_bavail * statfs_buf.f_bsize;
#else
bytesTotal = statfs_buf.f_blocks * statfs_buf.f_frsize;
bytesFree = statfs_buf.f_bfree * statfs_buf.f_frsize;
bytesAvailable = statfs_buf.f_bavail * statfs_buf.f_frsize;
#endif
blockSize = statfs_buf.f_bsize;
#if defined(Q_OS_ANDROID) || defined(Q_OS_BSD4) || defined(Q_OS_INTEGRITY) || defined(Q_OS_RTEMS)
#if defined(_STATFS_F_FLAGS)
readOnly = (statfs_buf.f_flags & ST_RDONLY) != 0;
#endif
#else
readOnly = (statfs_buf.f_flag & ST_RDONLY) != 0;
#endif
}
}
QList<QStorageInfo> QStorageInfoPrivate::mountedVolumes()
{
QStorageIterator it;
if (!it.isValid())
return QList<QStorageInfo>() << root();
QList<QStorageInfo> volumes;
while (it.next()) {
if (!shouldIncludeFs(it))
continue;
const QString mountDir = it.rootPath();
QStorageInfo info(mountDir);
info.d->device = it.device();
info.d->fileSystemType = it.fileSystemType();
info.d->subvolume = it.subvolume();
if (info.bytesTotal() == 0 && info != root())
continue;
volumes.append(info);
}
return volumes;
}
QStorageInfo QStorageInfoPrivate::root()
{
return QStorageInfo(QStringLiteral("/"));
}
QT_END_NAMESPACE
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