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412 lines
10 KiB
C
412 lines
10 KiB
C
/*
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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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#include "internal.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 <sys/mount.h>
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#include <ctype.h>
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#include <fstab.h>
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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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#include <linux/loop.h>
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static int use_loop = 0;
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#endif
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extern const char mtab_file[]; /* Defined in utility.c */
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static const char mount_usage[] = "\tmount [flags]\n"
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"\tmount [flags] device directory [-o options,more-options]\n"
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"\n"
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"Flags:\n"
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"\t-a:\tMount all file systems in fstab.\n"
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#ifdef BB_MTAB
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"\t-f:\t\"Fake\" mount. Add entry to mount table but don't mount it.\n"
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"\t-n:\tDon't write a mount table entry.\n"
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#endif
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"\t-o option:\tOne of many filesystem options, listed below.\n"
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"\t-r:\tMount the filesystem read-only.\n"
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"\t-t filesystem-type:\tSpecify the filesystem type.\n"
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"\t-w:\tMount for reading and writing (default).\n"
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"\n"
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"Options for use with the \"-o\" flag:\n"
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"\tasync / sync:\tWrites are asynchronous / synchronous.\n"
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"\tdev / nodev:\tAllow use of special device files / disallow them.\n"
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"\texec / noexec:\tAllow use of executable files / disallow them.\n"
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#if defined BB_FEATURE_MOUNT_LOOP
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"\tloop: Mounts a file via loop device.\n"
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#endif
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"\tsuid / nosuid:\tAllow set-user-id-root programs / disallow them.\n"
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"\tremount: Re-mount a currently-mounted filesystem, changing its flags.\n"
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"\tro / rw: Mount for read-only / read-write.\n"
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"\t"
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"There are EVEN MORE flags that are specific to each filesystem.\n"
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"You'll have to see the written documentation for those.\n";
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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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{"defaults", ~0, 0},
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{"dev", ~MS_NODEV, 0},
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{"exec", ~MS_NOEXEC, 0},
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{"nodev", ~0, MS_NODEV},
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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, char* mtab_opts)
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{
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int status=0;
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#if defined BB_MTAB
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if (fakeIt==FALSE)
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#endif
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{
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#if defined BB_FEATURE_MOUNT_LOOP
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if (use_loop) {
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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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fprintf(stderr, "Could not find a spare loop device\n");
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return( FALSE);
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}
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if (set_loop (specialfile, lofile, 0, &loro)) {
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fprintf(stderr, "Could not setup loop device\n");
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return( FALSE);
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}
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if (!(flags & MS_RDONLY) && loro) { /* loop is ro, but wanted rw */
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fprintf(stderr, "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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}
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/* If the mount was sucessful, do anything needed, then return TRUE */
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if (status == 0) {
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#if defined BB_MTAB
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if (useMtab==TRUE) {
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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 (specialfile != NULL) {
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del_loop(specialfile);
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}
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#endif
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return( FALSE);
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}
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#if defined BB_MTAB
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#define whine_if_fstab_is_missing() {}
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#else
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extern void whine_if_fstab_is_missing()
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{
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struct stat statBuf;
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if (stat("/etc/fstab", &statBuf) < 0)
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fprintf(stderr, "/etc/fstab file missing -- install one to name /dev/root.\n\n");
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}
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#endif
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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, unsigned long *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 = 1;
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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, char *mtab_opts)
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{
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int status = 0;
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char buf[255];
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#if defined BB_FEATURE_USE_PROCFS
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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, useMtab,
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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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{
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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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fprintf (stderr, "Mounting %s on %s failed: %s\n",
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blockDevice, directory, strerror(errno));
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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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unsigned long 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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/* Only compiled in if BB_MTAB is not defined */
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whine_if_fstab_is_missing();
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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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struct fstab* fstabItem;
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char *blockDevice = m->mnt_fsname;
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/* Note that if /etc/fstab is missing, libc can't fix up /dev/root for us */
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if (strcmp (blockDevice, "/dev/root") == 0) {
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fstabItem = getfsfile ("/");
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if (fstabItem != NULL)
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blockDevice = fstabItem->fs_spec;
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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(mtab_file);
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}
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exit( TRUE);
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}
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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) 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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#ifdef BB_MTAB
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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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useMtab = FALSE;
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break;
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#endif
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case '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) {
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struct mntent *m;
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FILE *f = setmntent ("/etc/fstab", "r");
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if (f == NULL) {
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perror("/etc/fstab");
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exit( FALSE);
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}
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while ((m = getmntent (f)) != NULL) {
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// If the file system isn't noauto, and isn't mounted on /,
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// and isn't swap or nfs, then mount it
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if ((!strstr (m->mnt_opts, "noauto")) &&
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(m->mnt_dir[1] != '\0') &&
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(!strstr (m->mnt_type, "swap")) &&
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(!strstr (m->mnt_type, "nfs")))
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{
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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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mount_one (m->mnt_fsname, m->mnt_dir, m->mnt_type,
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flags, string_flags, useMtab, fakeIt, extra_opts);
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}
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}
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endmntent (f);
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} else {
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if (device && directory) {
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#ifdef BB_NFSMOUNT
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if (strcmp(filesystemType, "nfs") == 0) {
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if (nfsmount(device, directory, &flags, &extra_opts, &string_flags, 1) != 0)
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exit(FALSE);
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}
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#endif
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exit (mount_one (device, directory, filesystemType,
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flags, string_flags, useMtab, fakeIt, extra_opts));
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} else {
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goto goodbye;
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}
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}
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exit( TRUE);
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goodbye:
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usage( mount_usage);
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}
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