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/* $Id: vbsfmount.c $ */
/** @file
* vbsfmount - Commonly used code to mount shared folders on Linux-based
* systems. Currently used by mount.vboxsf and VBoxService.
*/
/*
* Copyright (C) 2010-2023 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* 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, in version 3 of the
* License.
*
* 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; if not, see <https://www.gnu.org/licenses>.
*
* SPDX-License-Identifier: GPL-3.0-only
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#ifndef _GNU_SOURCE
# define _GNU_SOURCE
#endif
#include <assert.h>
#include <ctype.h>
#include <mntent.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <sys/mount.h>
#include "vbsfmount.h"
/** @todo Use defines for return values! */
int vbsfmount_complete(const char *pszSharedFolder, const char *pszMountPoint,
unsigned long fFlags, const char *pszOpts)
{
/*
* Combine pszOpts and fFlags.
*/
int rc;
size_t const cchFlags = (fFlags & MS_NOSUID ? strlen(MNTOPT_NOSUID) + 1 : 0)
+ (fFlags & MS_RDONLY ? strlen(MNTOPT_RO) : strlen(MNTOPT_RW));
size_t const cchOpts = pszOpts ? 1 + strlen(pszOpts) : 0;
char *pszBuf = (char *)malloc(cchFlags + cchOpts + 8);
if (pszBuf)
{
char *psz = pszBuf;
FILE *pMTab;
strcpy(psz, fFlags & MS_RDONLY ? MNTOPT_RO : MNTOPT_RW);
psz += strlen(psz);
if (fFlags & MS_NOSUID)
{
*psz++ = ',';
strcpy(psz, MNTOPT_NOSUID);
psz += strlen(psz);
}
if (cchOpts)
{
*psz++ = ',';
strcpy(psz, pszOpts);
}
assert(strlen(pszBuf) <= cchFlags + cchOpts);
/*
* Open the mtab and update it:
*/
pMTab = setmntent(MOUNTED, "a+");
if (pMTab)
{
struct mntent Entry;
Entry.mnt_fsname = (char*)pszSharedFolder;
Entry.mnt_dir = (char *)pszMountPoint;
Entry.mnt_type = "vboxsf";
Entry.mnt_opts = pszBuf;
Entry.mnt_freq = 0;
Entry.mnt_passno = 0;
if (!addmntent(pMTab, &Entry))
rc = 0; /* success. */
else
rc = 3; /* Could not add an entry to the mount table. */
endmntent(pMTab);
}
else
rc = 2; /* Could not open mount table for update. */
free(pszBuf);
}
else
rc = 1; /* allocation error */
return rc;
}
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