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/*
* LinuxFilesystemFunctions.cpp - implementation of LinuxFilesystemFunctions class
*
* Copyright (c) 2018-2025 Tobias Junghans <tobydox@veyon.io>
*
* This file is part of Veyon - https://veyon.io
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this program (see COPYING); if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*
*/
#include <QDir>
#include <fcntl.h>
#include <grp.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/types.h>
#include "LinuxFilesystemFunctions.h"
QString LinuxFilesystemFunctions::personalAppDataPath() const
{
return QDir::homePath() + QDir::separator() + QStringLiteral(".veyon");
}
QString LinuxFilesystemFunctions::globalAppDataPath() const
{
return QStringLiteral( "/etc/veyon" );
}
QString LinuxFilesystemFunctions::globalTempPath() const
{
return QStringLiteral( "/tmp" );
}
QString LinuxFilesystemFunctions::fileOwnerGroup( const QString& filePath )
{
return QFileInfo( filePath ).group();
}
bool LinuxFilesystemFunctions::setFileOwnerGroup( const QString& filePath, const QString& ownerGroup )
{
struct stat statBuffer{};
if( stat( filePath.toUtf8().constData(), &statBuffer ) != 0 )
{
vCritical() << "failed to stat file" << filePath;
return false;
}
const auto grp = getgrnam( ownerGroup.toUtf8().constData() );
if( grp == nullptr )
{
vCritical() << "failed to get gid for" << ownerGroup;
return false;
}
const auto gid = grp->gr_gid;
if( chown( filePath.toUtf8().constData(), statBuffer.st_uid, gid ) != 0 ) // Flawfinder:ignore
{
vCritical() << "failed to change owner group of file" << filePath;
return false;
}
return true;
}
bool LinuxFilesystemFunctions::setFileOwnerGroupPermissions( const QString& filePath, QFile::Permissions permissions )
{
QFile file( filePath );
auto currentPermissions = file.permissions();
for( auto permissionFlag : { QFile::ReadGroup, QFile::WriteGroup, QFile::ExeGroup } )
{
if( permissions & permissionFlag )
{
currentPermissions |= permissionFlag;
}
else
{
currentPermissions &= ~permissionFlag;
}
}
return QFile( filePath ).setPermissions( permissions );
}
bool LinuxFilesystemFunctions::openFileSafely( QFile* file, QIODevice::OpenMode openMode, QFile::Permissions permissions )
{
if( file == nullptr )
{
return false;
}
int flags = O_NOFOLLOW | O_CLOEXEC;
if( openMode & QFile::ReadOnly )
{
flags |= O_RDONLY;
}
if( openMode & QFile::WriteOnly )
{
flags |= O_WRONLY;
if( permissions )
{
flags |= O_CREAT;
}
}
if( openMode & QFile::Append )
{
flags |= O_APPEND;
}
else if( openMode & QFile::Truncate )
{
flags |= O_TRUNC;
}
int fileMode =
( permissions.testFlag( QFile::ReadOwner ) || permissions.testFlag( QFile::ReadUser ) ? S_IRUSR : 0 ) |
( permissions.testFlag( QFile::WriteOwner ) || permissions.testFlag( QFile::WriteUser ) ? S_IWUSR : 0 ) |
( permissions.testFlag( QFile::ExeOwner ) || permissions.testFlag( QFile::ExeUser ) ? S_IXUSR : 0 ) |
( permissions.testFlag( QFile::ReadGroup ) ? S_IRGRP : 0 ) |
( permissions.testFlag( QFile::WriteGroup ) ? S_IWGRP : 0 ) |
( permissions.testFlag( QFile::ExeGroup ) ? S_IXGRP : 0 ) |
( permissions.testFlag( QFile::ReadOther ) ? S_IROTH : 0 ) |
( permissions.testFlag( QFile::WriteOther ) ? S_IWOTH : 0 ) |
( permissions.testFlag( QFile::ExeOther ) ? S_IXOTH : 0 );
int fd = open( file->fileName().toUtf8().constData(), flags, fileMode );
if( fd == -1 )
{
return false;
}
struct stat s{};
if( fstat(fd, &s) != 0 )
{
close(fd);
return false;
}
if( s.st_uid != getuid() )
{
close(fd);
return false;
}
if( fileMode )
{
(void) fchmod( fd, fileMode );
}
return file->open( fd, openMode, QFileDevice::AutoCloseHandle );
}
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