| 1 | /* $Id: vbsfmount.c 106061 2024-09-16 14:03:52Z vboxsync $ */
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| 2 | /** @file
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| 3 | * vbsfmount - Commonly used code to mount shared folders on Linux-based
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| 4 | * systems. Currently used by mount.vboxsf and VBoxService.
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| 5 | */
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| 6 |
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| 7 | /*
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| 8 | * Copyright (C) 2010-2024 Oracle and/or its affiliates.
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| 9 | *
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| 10 | * This file is part of VirtualBox base platform packages, as
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| 11 | * available from https://www.virtualbox.org.
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| 12 | *
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| 13 | * This program is free software; you can redistribute it and/or
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| 14 | * modify it under the terms of the GNU General Public License
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| 15 | * as published by the Free Software Foundation, in version 3 of the
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| 16 | * License.
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| 17 | *
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| 18 | * This program is distributed in the hope that it will be useful, but
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| 19 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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| 20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 21 | * General Public License for more details.
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| 22 | *
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| 23 | * You should have received a copy of the GNU General Public License
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| 24 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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| 25 | *
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| 26 | * SPDX-License-Identifier: GPL-3.0-only
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| 27 | */
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| 28 |
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| 29 |
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| 30 | /*********************************************************************************************************************************
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| 31 | * Header Files *
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| 32 | *********************************************************************************************************************************/
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| 33 | #ifndef _GNU_SOURCE
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| 34 | # define _GNU_SOURCE
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| 35 | #endif
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| 36 | #include <assert.h>
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| 37 | #include <ctype.h>
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| 38 | #include <mntent.h>
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| 39 | #include <stdio.h>
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| 40 | #include <stdlib.h>
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| 41 | #include <stdint.h>
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| 42 | #include <string.h>
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| 43 | #include <sys/mount.h>
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| 44 |
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| 45 | #include "vbsfmount.h"
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| 46 |
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| 47 |
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| 48 | /** @todo Use defines for return values! */
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| 49 | int vbsfmount_complete(const char *pszSharedFolder, const char *pszMountPoint,
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| 50 | unsigned long fFlags, const char *pszOpts)
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| 51 | {
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| 52 | /*
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| 53 | * Combine pszOpts and fFlags.
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| 54 | */
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| 55 | int rc;
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| 56 | size_t const cchFlags = (fFlags & MS_NOSUID ? strlen(MNTOPT_NOSUID) + 1 : 0)
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| 57 | + (fFlags & MS_RDONLY ? strlen(MNTOPT_RO) : strlen(MNTOPT_RW));
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| 58 | size_t const cchOpts = pszOpts ? 1 + strlen(pszOpts) : 0;
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| 59 | char *pszBuf = (char *)malloc(cchFlags + cchOpts + 8);
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| 60 | if (pszBuf)
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| 61 | {
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| 62 | char *psz = pszBuf;
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| 63 | FILE *pMTab;
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| 64 |
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| 65 | strcpy(psz, fFlags & MS_RDONLY ? MNTOPT_RO : MNTOPT_RW);
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| 66 | psz += strlen(psz);
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| 67 |
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| 68 | if (fFlags & MS_NOSUID)
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| 69 | {
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| 70 | *psz++ = ',';
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| 71 | strcpy(psz, MNTOPT_NOSUID);
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| 72 | psz += strlen(psz);
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| 73 | }
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| 74 |
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| 75 | if (cchOpts)
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| 76 | {
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| 77 | *psz++ = ',';
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| 78 | strcpy(psz, pszOpts);
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| 79 | }
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| 80 |
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| 81 | assert(strlen(pszBuf) <= cchFlags + cchOpts);
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| 82 |
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| 83 | /*
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| 84 | * Open the mtab and update it:
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| 85 | */
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| 86 | pMTab = setmntent(MOUNTED, "a+");
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| 87 | if (pMTab)
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| 88 | {
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| 89 | struct mntent Entry;
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| 90 | Entry.mnt_fsname = (char*)pszSharedFolder;
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| 91 | Entry.mnt_dir = (char *)pszMountPoint;
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| 92 | Entry.mnt_type = "vboxsf";
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| 93 | Entry.mnt_opts = pszBuf;
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| 94 | Entry.mnt_freq = 0;
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| 95 | Entry.mnt_passno = 0;
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| 96 |
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| 97 | if (!addmntent(pMTab, &Entry))
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| 98 | rc = 0; /* success. */
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| 99 | else
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| 100 | rc = 3; /* Could not add an entry to the mount table. */
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| 101 |
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| 102 | endmntent(pMTab);
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| 103 | }
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| 104 | else
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| 105 | rc = 2; /* Could not open mount table for update. */
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| 106 |
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| 107 | free(pszBuf);
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| 108 | }
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| 109 | else
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| 110 | rc = 1; /* allocation error */
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| 111 | return rc;
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| 112 | }
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| 113 |
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