515 lines
14 KiB
C
515 lines
14 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini mount implementation for busybox
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*
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* Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* 3/21/1999 Charles P. Wright <cpwright@cpwright.com>
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* searches through fstab when -a is passed
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* will try mounting stuff with all fses when passed -t auto
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*
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* 1999-04-17 Dave Cinege...Rewrote -t auto. Fixed ro mtab.
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*
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* 1999-10-07 Erik Andersen <andersen@lineo.com>, <andersee@debian.org>.
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* Rewrite of a lot of code. Removed mtab usage (I plan on
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* putting it back as a compile-time option some time),
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* major adjustments to option parsing, and some serious
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* dieting all around.
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*
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* 1999-11-06 mtab suppport is back - andersee
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*
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* 2000-01-12 Ben Collins <bcollins@debian.org>, Borrowed utils-linux's
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* mount to add loop support.
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*
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* 2000-04-30 Dave Cinege <dcinege@psychosis.com>
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* Rewrote fstab while loop and lower mount section. Can now do
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* single mounts from fstab. Can override fstab options for single
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* mount. Common mount_one call for single mounts and 'all'. Fixed
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* mtab updating and stale entries. Removed 'remount' default.
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*
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*/
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#include "busybox.h"
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#include <stdlib.h>
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#include <unistd.h>
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#include <errno.h>
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#include <string.h>
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#include <stdio.h>
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#include <mntent.h>
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#include <ctype.h>
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#if defined BB_FEATURE_USE_DEVPS_PATCH
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#include <linux/devmtab.h> /* For Erik's nifty devmtab device driver */
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#endif
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#define MS_MGC_VAL 0xc0ed0000 /* Magic number indicatng "new" flags */
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#define MS_RDONLY 1 /* Mount read-only */
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#define MS_NOSUID 2 /* Ignore suid and sgid bits */
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#define MS_NODEV 4 /* Disallow access to device special files */
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#define MS_NOEXEC 8 /* Disallow program execution */
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#define MS_SYNCHRONOUS 16 /* Writes are synced at once */
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#define MS_REMOUNT 32 /* Alter flags of a mounted FS */
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#define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */
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#define S_QUOTA 128 /* Quota initialized for file/directory/symlink */
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#define S_APPEND 256 /* Append-only file */
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#define S_IMMUTABLE 512 /* Immutable file */
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#define MS_NOATIME 1024 /* Do not update access times. */
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#define MS_NODIRATIME 2048 /* Do not update directory access times */
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#if defined BB_FEATURE_MOUNT_LOOP
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#include <fcntl.h>
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#include <sys/ioctl.h>
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static int use_loop = FALSE;
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#endif
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extern int mount (__const char *__special_file, __const char *__dir,
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__const char *__fstype, unsigned long int __rwflag,
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__const void *__data);
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extern int umount (__const char *__special_file);
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extern int umount2 (__const char *__special_file, int __flags);
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extern const char mtab_file[]; /* Defined in utility.c */
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struct mount_options {
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const char *name;
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unsigned long and;
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unsigned long or;
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};
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static const struct mount_options mount_options[] = {
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{"async", ~MS_SYNCHRONOUS, 0},
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{"atime", ~0, ~MS_NOATIME},
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{"defaults", ~0, 0},
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{"dev", ~MS_NODEV, 0},
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{"diratime", ~0, ~MS_NODIRATIME},
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{"exec", ~MS_NOEXEC, 0},
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{"noatime", ~0, MS_NOATIME},
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{"nodev", ~0, MS_NODEV},
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{"nodiratime", ~0, MS_NODIRATIME},
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{"noexec", ~0, MS_NOEXEC},
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{"nosuid", ~0, MS_NOSUID},
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{"remount", ~0, MS_REMOUNT},
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{"ro", ~0, MS_RDONLY},
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{"rw", ~MS_RDONLY, 0},
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{"suid", ~MS_NOSUID, 0},
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{"sync", ~0, MS_SYNCHRONOUS},
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{0, 0, 0}
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};
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static int
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do_mount(char *specialfile, char *dir, char *filesystemtype,
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long flags, void *string_flags, int useMtab, int fakeIt,
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char *mtab_opts)
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{
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int status = 0;
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#if defined BB_FEATURE_MOUNT_LOOP
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char *lofile = NULL;
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#endif
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if (fakeIt == FALSE)
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{
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#if defined BB_FEATURE_MOUNT_LOOP
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if (use_loop==TRUE) {
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int loro = flags & MS_RDONLY;
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char *lofile = specialfile;
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specialfile = find_unused_loop_device();
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if (specialfile == NULL) {
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error_msg_and_die("Could not find a spare loop device\n");
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}
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if (set_loop(specialfile, lofile, 0, &loro)) {
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error_msg_and_die("Could not setup loop device\n");
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}
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if (!(flags & MS_RDONLY) && loro) { /* loop is ro, but wanted rw */
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error_msg("WARNING: loop device is read-only\n");
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flags &= ~MS_RDONLY;
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}
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}
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#endif
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status = mount(specialfile, dir, filesystemtype, flags, string_flags);
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if (errno == EROFS) {
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error_msg("%s is write-protected, mounting read-only\n", specialfile);
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status = mount(specialfile, dir, filesystemtype, flags |= MS_RDONLY, string_flags);
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}
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}
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/* If the mount was sucessful, do anything needed, then return TRUE */
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if (status == 0 || fakeIt==TRUE) {
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#if defined BB_MTAB
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if (useMtab == TRUE) {
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erase_mtab(specialfile); // Clean any stale entries
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write_mtab(specialfile, dir, filesystemtype, flags, mtab_opts);
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}
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#endif
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return (TRUE);
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}
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/* Bummer. mount failed. Clean up */
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#if defined BB_FEATURE_MOUNT_LOOP
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if (lofile != NULL) {
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del_loop(specialfile);
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}
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#endif
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if (errno == EPERM) {
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error_msg_and_die("permission denied. Are you root?\n");
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}
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return (FALSE);
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}
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/* Seperate standard mount options from the nonstandard string options */
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static void
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parse_mount_options(char *options, int *flags, char *strflags)
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{
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while (options) {
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int gotone = FALSE;
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char *comma = strchr(options, ',');
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const struct mount_options *f = mount_options;
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if (comma)
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*comma = '\0';
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while (f->name != 0) {
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if (strcasecmp(f->name, options) == 0) {
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*flags &= f->and;
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*flags |= f->or;
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gotone = TRUE;
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break;
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}
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f++;
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}
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#if defined BB_FEATURE_MOUNT_LOOP
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if (gotone == FALSE && !strcasecmp("loop", options)) { /* loop device support */
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use_loop = TRUE;
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gotone = TRUE;
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}
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#endif
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if (*strflags && strflags != '\0' && gotone == FALSE) {
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char *temp = strflags;
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temp += strlen(strflags);
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*temp++ = ',';
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*temp++ = '\0';
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}
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if (gotone == FALSE)
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strcat(strflags, options);
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if (comma) {
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*comma = ',';
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options = ++comma;
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} else {
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break;
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}
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}
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}
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int
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mount_one(char *blockDevice, char *directory, char *filesystemType,
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unsigned long flags, char *string_flags, int useMtab, int fakeIt,
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char *mtab_opts, int whineOnErrors)
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{
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int status = 0;
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#if defined BB_FEATURE_USE_PROCFS
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char buf[255];
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if (strcmp(filesystemType, "auto") == 0) {
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FILE *f = fopen("/proc/filesystems", "r");
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if (f == NULL)
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return (FALSE);
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while (fgets(buf, sizeof(buf), f) != NULL) {
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filesystemType = buf;
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if (*filesystemType == '\t') { // Not a nodev filesystem
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// Add NULL termination to each line
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while (*filesystemType && *filesystemType != '\n')
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filesystemType++;
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*filesystemType = '\0';
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filesystemType = buf;
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filesystemType++; // hop past tab
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status = do_mount(blockDevice, directory, filesystemType,
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flags | MS_MGC_VAL, string_flags,
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useMtab, fakeIt, mtab_opts);
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if (status == TRUE)
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break;
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}
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}
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fclose(f);
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} else
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#endif
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#if defined BB_FEATURE_USE_DEVPS_PATCH
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if (strcmp(filesystemType, "auto") == 0) {
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int fd, i, numfilesystems;
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char device[] = "/dev/mtab";
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struct k_fstype *fslist;
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/* open device */
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fd = open(device, O_RDONLY);
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if (fd < 0)
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perror_msg_and_die("open failed for `%s'", device);
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/* How many filesystems? We need to know to allocate enough space */
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numfilesystems = ioctl (fd, DEVMTAB_COUNT_FILESYSTEMS);
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if (numfilesystems<0)
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perror_msg_and_die("\nDEVMTAB_COUNT_FILESYSTEMS");
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fslist = (struct k_fstype *) xcalloc ( numfilesystems, sizeof(struct k_fstype));
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/* Grab the list of available filesystems */
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status = ioctl (fd, DEVMTAB_GET_FILESYSTEMS, fslist);
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if (status<0)
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perror_msg_and_die("\nDEVMTAB_GET_FILESYSTEMS");
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/* Walk the list trying to mount filesystems
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* that do not claim to be nodev filesystems */
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for( i = 0 ; i < numfilesystems ; i++) {
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if (fslist[i].mnt_nodev)
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continue;
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status = do_mount(blockDevice, directory, fslist[i].mnt_type,
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flags | MS_MGC_VAL, string_flags,
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useMtab, fakeIt, mtab_opts);
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if (status == TRUE)
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break;
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}
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free( fslist);
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close(fd);
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} else
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#endif
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{
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status = do_mount(blockDevice, directory, filesystemType,
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flags | MS_MGC_VAL, string_flags, useMtab,
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fakeIt, mtab_opts);
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}
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if (status == FALSE) {
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if (whineOnErrors == TRUE) {
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perror_msg("Mounting %s on %s failed", blockDevice, directory);
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}
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return (FALSE);
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}
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return (TRUE);
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}
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extern int mount_main(int argc, char **argv)
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{
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char string_flags_buf[1024] = "";
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char *string_flags = string_flags_buf;
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char *extra_opts = string_flags_buf;
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int flags = 0;
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char *filesystemType = "auto";
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char *device = NULL;
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char *directory = NULL;
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int all = FALSE;
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int fakeIt = FALSE;
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int useMtab = TRUE;
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int i;
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int rc = EXIT_FAILURE;
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int fstabmount = FALSE;
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#if defined BB_FEATURE_USE_DEVPS_PATCH
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if (argc == 1) {
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int fd, i, numfilesystems;
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char device[] = "/dev/mtab";
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struct k_mntent *mntentlist;
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/* open device */
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fd = open(device, O_RDONLY);
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if (fd < 0)
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perror_msg_and_die("open failed for `%s'", device);
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/* How many mounted filesystems? We need to know to
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* allocate enough space for later... */
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numfilesystems = ioctl (fd, DEVMTAB_COUNT_MOUNTS);
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if (numfilesystems<0)
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perror_msg_and_die( "\nDEVMTAB_COUNT_MOUNTS");
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mntentlist = (struct k_mntent *) xcalloc ( numfilesystems, sizeof(struct k_mntent));
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/* Grab the list of mounted filesystems */
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if (ioctl (fd, DEVMTAB_GET_MOUNTS, mntentlist)<0)
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perror_msg_and_die( "\nDEVMTAB_GET_MOUNTS");
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for( i = 0 ; i < numfilesystems ; i++) {
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fprintf( stdout, "%s %s %s %s %d %d\n", mntentlist[i].mnt_fsname,
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mntentlist[i].mnt_dir, mntentlist[i].mnt_type,
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mntentlist[i].mnt_opts, mntentlist[i].mnt_freq,
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mntentlist[i].mnt_passno);
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}
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#ifdef BB_FEATURE_CLEAN_UP
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/* Don't bother to close files or free memory. Exit
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* does that automagically, so we can save a few bytes */
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free( mntentlist);
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close(fd);
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#endif
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return EXIT_SUCCESS;
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}
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#else
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if (argc == 1) {
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FILE *mountTable = setmntent(mtab_file, "r");
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if (mountTable) {
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struct mntent *m;
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while ((m = getmntent(mountTable)) != 0) {
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char *blockDevice = m->mnt_fsname;
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if (strcmp(blockDevice, "/dev/root") == 0) {
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find_real_root_device_name( blockDevice);
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}
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printf("%s on %s type %s (%s)\n", blockDevice, m->mnt_dir,
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m->mnt_type, m->mnt_opts);
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}
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endmntent(mountTable);
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} else {
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perror_msg_and_die("%s", mtab_file);
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}
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return EXIT_SUCCESS;
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}
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#endif
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/* Parse options */
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i = --argc;
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argv++;
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while (i > 0 && **argv) {
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if (**argv == '-') {
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char *opt = *argv;
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while (i > 0 && *++opt)
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switch (*opt) {
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case 'o':
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if (--i == 0) {
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goto goodbye;
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}
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parse_mount_options(*(++argv), &flags, string_flags);
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break;
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case 'r':
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flags |= MS_RDONLY;
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break;
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case 't':
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if (--i == 0) {
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goto goodbye;
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}
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filesystemType = *(++argv);
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break;
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case 'w':
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flags &= ~MS_RDONLY;
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break;
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case 'a':
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all = TRUE;
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break;
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case 'f':
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fakeIt = TRUE;
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break;
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#ifdef BB_MTAB
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case 'n':
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useMtab = FALSE;
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break;
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#endif
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case 'v':
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break; /* ignore -v */
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case 'h':
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case '-':
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goto goodbye;
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}
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} else {
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if (device == NULL)
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device = *argv;
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else if (directory == NULL)
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directory = *argv;
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else {
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goto goodbye;
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}
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}
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i--;
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argv++;
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}
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if (all == TRUE || directory == NULL) {
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struct mntent *m;
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FILE *f = setmntent("/etc/fstab", "r");
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fstabmount = TRUE;
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if (f == NULL)
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perror_msg_and_die( "\nCannot read /etc/fstab");
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while ((m = getmntent(f)) != NULL) {
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if (all == FALSE && directory == NULL && (
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(strcmp(device, m->mnt_fsname) != 0) &&
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(strcmp(device, m->mnt_dir) != 0) ) ) {
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continue;
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}
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if (all == TRUE && ( // If we're mounting 'all'
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(strstr(m->mnt_opts, "noauto")) || // and the file system isn't noauto,
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(strstr(m->mnt_type, "swap")) || // and isn't swap or nfs, then mount it
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(strstr(m->mnt_type, "nfs")) ) ) {
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continue;
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}
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if (all == TRUE || flags == 0) { // Allow single mount to override fstab flags
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flags = 0;
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*string_flags = '\0';
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parse_mount_options(m->mnt_opts, &flags, string_flags);
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}
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device = strdup(m->mnt_fsname);
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directory = strdup(m->mnt_dir);
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filesystemType = strdup(m->mnt_type);
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singlemount:
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rc = EXIT_SUCCESS;
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#ifdef BB_NFSMOUNT
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if (strchr(device, ':') != NULL)
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filesystemType = "nfs";
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if (strcmp(filesystemType, "nfs") == 0) {
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rc = nfsmount (device, directory, &flags,
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&extra_opts, &string_flags, 1);
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if ( rc != 0) {
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perror_msg_and_die("nfsmount failed");
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rc = EXIT_FAILURE;
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}
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}
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#endif
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if (!mount_one(device, directory, filesystemType, flags,
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string_flags, useMtab, fakeIt, extra_opts, TRUE))
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rc = EXIT_FAILURE;
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if (all == FALSE)
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break;
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}
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if (fstabmount == TRUE)
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endmntent(f);
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if (all == FALSE && fstabmount == TRUE && directory == NULL)
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fprintf(stderr, "Can't find %s in /etc/fstab\n", device);
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exit(rc);
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}
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goto singlemount;
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goodbye:
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usage(mount_usage);
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}
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