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/* $OpenBSD: clri.c,v 1.18 2015/11/03 04:47:55 mmcc Exp $ */
/* $NetBSD: clri.c,v 1.19 2005/01/20 15:50:47 xtraeme Exp $ */
/*
* Copyright (c) 1990, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Rich $alz of BBN Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/param.h> /* MAXBSIZE DEV_BSIZE */
#include <ufs/ufs/dinode.h>
#include <ufs/ffs/fs.h>
#include <err.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <unistd.h>
/*
* Possible superblock locations ordered from most to least likely.
*/
static int sblock_try[] = SBLOCKSEARCH;
static void
usage(void)
{
(void)fprintf(stderr, "usage: clri special_device inode_number ...\n");
exit(1);
}
int
main(int argc, char *argv[])
{
struct ufs1_dinode *dp1;
struct ufs2_dinode *dp2;
struct fs *sbp;
char *ibuf[MAXBSIZE];
char *fs, sblock[SBLOCKSIZE];
size_t bsize;
off_t offset;
int i, fd, imax, inonum;
if (argc < 3)
usage();
fs = *++argv;
sbp = NULL;
/* get the superblock. */
if ((fd = open(fs, O_RDWR, 0)) < 0)
err(1, "%s", fs);
if (pledge("stdio", NULL) == -1)
err(1, "pledge");
for (i = 0; sblock_try[i] != -1; i++) {
offset = (off_t)(sblock_try[i]);
if (pread(fd, sblock, sizeof(sblock), offset) != sizeof(sblock))
err(1, "%s: can't read superblock", fs);
sbp = (struct fs *)sblock;
if ((sbp->fs_magic == FS_UFS1_MAGIC ||
(sbp->fs_magic == FS_UFS2_MAGIC &&
sbp->fs_sblockloc == sblock_try[i])) &&
sbp->fs_bsize <= MAXBSIZE &&
sbp->fs_bsize >= (int)sizeof(struct fs))
break;
}
if (sblock_try[i] == -1)
errx(2, "cannot find file system superblock");
bsize = sbp->fs_bsize;
/* check that inode numbers are valid */
imax = sbp->fs_ncg * sbp->fs_ipg;
for (i = 1; i < (argc - 1); i++) {
const char *errstr;
strtonum(argv[i], 1, imax, &errstr);
if (errstr)
errx(1, "%s is not a valid inode number: %s", argv[i], errstr);
}
/* clear the clean flag in the superblock */
if (sbp->fs_inodefmt >= FS_44INODEFMT) {
sbp->fs_clean = 0;
if (pwrite(fd, sblock, sizeof(sblock), offset) != sizeof(sblock))
err(1, "%s: can't update superblock", fs);
(void)fsync(fd);
}
/* remaining arguments are inode numbers. */
while (*++argv) {
/* get the inode number. */
inonum = strtonum(*argv, 1, imax, NULL);
(void)printf("clearing %u\n", inonum);
/* read in the appropriate block. */
offset = ino_to_fsba(sbp, inonum); /* inode to fs blk */
offset = fsbtodb(sbp, offset); /* fs blk disk blk */
offset *= DEV_BSIZE; /* disk blk to bytes */
/* seek and read the block */
if (pread(fd, ibuf, bsize, offset) != bsize)
err(1, "%s", fs);
if (sbp->fs_magic == FS_UFS2_MAGIC) {
/* get the inode within the block. */
dp2 = &(((struct ufs2_dinode *)ibuf)
[ino_to_fsbo(sbp, inonum)]);
/* clear the inode, and bump the generation count. */
memset(dp2, 0, sizeof(*dp2));
dp2->di_gen = arc4random();
} else {
/* get the inode within the block. */
dp1 = &(((struct ufs1_dinode *)ibuf)
[ino_to_fsbo(sbp, inonum)]);
/* clear the inode, and bump the generation count. */
memset(dp1, 0, sizeof(*dp1));
dp1->di_gen = arc4random();
}
/* backup and write the block */
if (pwrite(fd, ibuf, bsize, offset) != bsize)
err(1, "%s", fs);
(void)fsync(fd);
}
(void)close(fd);
exit(0);
}
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