498 lines
13 KiB
C
Executable File
498 lines
13 KiB
C
Executable File
/* 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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* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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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@codepoet.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 support 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 <limits.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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#include "busybox.h"
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#ifdef CONFIG_NFSMOUNT
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#if defined(__UCLIBC__) && ! defined(__UCLIBC_HAS_RPC__)
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#error "You need to build uClibc with UCLIBC_HAS_RPC for busybox mount with NFS support to compile."
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#endif
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#endif
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enum {
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MS_MGC_VAL = 0xc0ed0000, /* Magic number indicatng "new" flags */
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MS_RDONLY = 1, /* Mount read-only */
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MS_NOSUID = 2, /* Ignore suid and sgid bits */
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MS_NODEV = 4, /* Disallow access to device special files */
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MS_NOEXEC = 8, /* Disallow program execution */
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MS_SYNCHRONOUS = 16, /* Writes are synced at once */
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MS_REMOUNT = 32, /* Alter flags of a mounted FS */
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MS_MANDLOCK = 64, /* Allow mandatory locks on an FS */
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S_QUOTA = 128, /* Quota initialized for file/directory/symlink */
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S_APPEND = 256, /* Append-only file */
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S_IMMUTABLE = 512, /* Immutable file */
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MS_NOATIME = 1024, /* Do not update access times. */
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MS_NODIRATIME = 2048, /* Do not update directory access times */
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MS_BIND = 4096, /* Use the new linux 2.4.x "mount --bind" feature */
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MS_MOVE = 8192, /* Use the new linux 2.4.x "mount --move" feature */
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};
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#if defined CONFIG_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 int sysfs(int option, unsigned int fs_index, char *buf);
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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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{"noauto", ~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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{"bind", ~0, MS_BIND},
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{"move", ~0, MS_MOVE},
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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, long flags,
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void *string_flags, int useMtab, int fakeIt, char *mtab_opts,
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int mount_all)
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{
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int status = 0;
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#if defined CONFIG_FEATURE_MOUNT_LOOP
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char *lofile = NULL;
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#endif
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if (!fakeIt) {
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#if defined CONFIG_FEATURE_MOUNT_LOOP
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if (use_loop == TRUE) {
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int loro = flags & MS_RDONLY;
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lofile = specialfile;
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specialfile = find_unused_loop_device();
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if (specialfile == NULL) {
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bb_error_msg_and_die("Could not find a spare loop device");
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}
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if (set_loop(specialfile, lofile, 0, &loro)) {
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bb_error_msg_and_die("Could not setup loop device");
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}
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if (!(flags & MS_RDONLY) && loro) { /* loop is ro, but wanted rw */
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bb_error_msg("WARNING: loop device is read-only");
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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 (status < 0 && errno == EROFS) {
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bb_error_msg("%s is write-protected, mounting read-only",
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specialfile);
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status = mount(specialfile, dir, filesystemtype, flags |=
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MS_RDONLY, string_flags);
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}
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/* Don't whine about already mounted filesystems when mounting all. */
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if (status < 0 && errno == EBUSY && mount_all) {
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return TRUE;
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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 CONFIG_FEATURE_MTAB_SUPPORT
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if (useMtab) {
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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 CONFIG_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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bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
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}
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return (FALSE);
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}
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static void paste_str(char **s1, const char *s2)
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{
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*s1 = xrealloc(*s1, strlen(*s1) + strlen(s2) + 1);
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strcat(*s1, s2);
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}
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/* Seperate standard mount options from the nonstandard string options */
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static void 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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}
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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 CONFIG_FEATURE_MOUNT_LOOP
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if (!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 (!gotone) {
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if (**strflags) {
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/* have previous parsed options */
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paste_str(strflags, ",");
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}
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paste_str(strflags, options);
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}
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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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static int mount_one(char *blockDevice, char *directory, char *filesystemType,
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unsigned long flags, char *string_flags, int useMtab,
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int fakeIt, char *mtab_opts, int whineOnErrors,
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int mount_all)
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{
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int status = 0;
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if (strcmp(filesystemType, "auto") == 0) {
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char buf[255];
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FILE *f;
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int read_proc = 0;
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f = fopen("/etc/filesystems", "r");
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if (f) {
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while (fgets(buf, sizeof(buf), f)) {
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if (*buf == '*') {
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read_proc = 1;
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} else if (*buf == '#') {
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continue;
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} else {
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filesystemType = buf;
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/* Add NULL termination to each line */
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while (*filesystemType && !isspace(*filesystemType)) {
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filesystemType++;
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}
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*filesystemType = '\0';
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filesystemType = buf;
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if (bb_strlen(filesystemType)) {
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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, mount_all);
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if (status) {
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break;
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}
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}
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}
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}
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fclose(f);
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} else {
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read_proc = 1;
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}
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if (read_proc && !status) {
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f = bb_xfopen("/proc/filesystems", "r");
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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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}
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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, useMtab,
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fakeIt, mtab_opts, mount_all);
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if (status) {
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break;
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}
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}
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}
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fclose(f);
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}
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} else {
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status = do_mount(blockDevice, directory, filesystemType,
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flags | MS_MGC_VAL, string_flags, useMtab, fakeIt,
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mtab_opts, mount_all);
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}
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if (!status) {
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if (whineOnErrors) {
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bb_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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static void show_mounts(char *onlytype)
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{
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FILE *mountTable = setmntent(bb_path_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, "rootfs") == 0) {
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continue;
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} else if (strcmp(blockDevice, "/dev/root") == 0) {
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blockDevice = find_real_root_device_name();
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}
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if (!onlytype || (strcmp(m->mnt_type, onlytype) == 0)) {
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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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#ifdef CONFIG_FEATURE_CLEAN_UP
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if (blockDevice != m->mnt_fsname) {
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free(blockDevice);
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}
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#endif
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}
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endmntent(mountTable);
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} else {
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bb_perror_msg_and_die(bb_path_mtab_file);
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}
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exit(EXIT_SUCCESS);
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}
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extern int mount_main(int argc, char **argv)
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{
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struct stat statbuf;
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char *string_flags = bb_xstrdup("");
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char *extra_opts;
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int flags = 0;
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char *filesystemType = "auto";
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int got_filesystemType = 0;
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char *device = xmalloc(PATH_MAX);
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char *directory = xmalloc(PATH_MAX);
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struct mntent *m = 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 rc = EXIT_FAILURE;
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FILE *f = 0;
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int opt;
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/* Parse options */
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while ((opt = getopt(argc, argv, "o:rt:wafnv")) > 0) {
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switch (opt) {
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case 'o':
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parse_mount_options(optarg, &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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filesystemType = optarg;
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got_filesystemType = 1;
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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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case 'n':
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#ifdef CONFIG_FEATURE_MTAB_SUPPORT
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useMtab = FALSE;
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#endif
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break;
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case 'v':
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break; /* ignore -v */
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}
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}
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if (!all && (optind == argc)) {
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show_mounts(got_filesystemType ? filesystemType : NULL);
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}
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if (optind < argc) {
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/* if device is a filename get its real path */
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if (stat(argv[optind], &statbuf) == 0) {
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char *tmp = bb_simplify_path(argv[optind]);
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safe_strncpy(device, tmp, PATH_MAX);
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} else {
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safe_strncpy(device, argv[optind], PATH_MAX);
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}
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}
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if (optind + 1 < argc)
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directory = bb_simplify_path(argv[optind + 1]);
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if (all || optind + 1 == argc) {
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f = setmntent("/usr/etc/fstab", "r");
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if (f == NULL)
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bb_perror_msg_and_die("\nCannot read /usr/etc/fstab");
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while ((m = getmntent(f)) != NULL) {
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if (!all && (optind + 1 == argc)
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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 && ( /* 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, then mount it */
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{
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continue;
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}
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if (all || flags == 0) { /* Allow single mount to override fstab flags */
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flags = 0;
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string_flags[0] = 0;
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parse_mount_options(m->mnt_opts, &flags, &string_flags);
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}
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strcpy(device, m->mnt_fsname);
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strcpy(directory, m->mnt_dir);
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filesystemType = bb_xstrdup(m->mnt_type);
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singlemount:
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extra_opts = string_flags;
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rc = EXIT_SUCCESS;
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#ifdef CONFIG_NFSMOUNT
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if (strchr(device, ':') != NULL) {
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filesystemType = "nfs";
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if (nfsmount
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(device, directory, &flags, &extra_opts, &string_flags,
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1)) {
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bb_perror_msg("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
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(device, directory, filesystemType, flags, string_flags,
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useMtab, fakeIt, extra_opts, TRUE, all)) {
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rc = EXIT_FAILURE;
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}
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if (!all) {
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break;
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}
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}
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if (f) {
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endmntent(f);
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}
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if (!all && f && m == NULL) {
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fprintf(stderr, "Can't find %s in /etc/fstab\n", device);
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}
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return rc;
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}
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goto singlemount;
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}
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