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/* $OpenBSD: fsirand.c,v 1.4 1997/01/28 04:21:25 millert Exp $ */
/*
* Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com>
* All rights reserved.
*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Todd C. Miller.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED ``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 AUTHOR 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.
*/
#ifndef lint
static char rcsid[] = "$OpenBSD: fsirand.c,v 1.4 1997/01/28 04:21:25 millert Exp $";
#endif /* not lint */
#include <sys/param.h>
#include <sys/types.h>
#include <ufs/ffs/fs.h>
#include <ufs/ufs/dinode.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <util.h>
void usage __P((int));
void fsirand __P((char *));
extern char *__progname;
int printonly = 0, force = 0;
int
main(argc, argv)
int argc;
char *argv[];
{
int n;
while ((n = getopt(argc, argv, "fp")) != -1) {
switch (n) {
case 'p':
printonly++;
break;
case 'f':
force++;
break;
default:
usage(1);
}
}
if (argc - optind < 1)
usage(1);
for (n = optind; n < argc; n++) {
if (argc - optind != 1)
(void)puts(argv[n]);
fsirand(argv[n]);
if (n < argc - 1)
putchar('\n');
}
exit(0);
}
void
fsirand(device)
char *device;
{
static struct dinode *inodebuf;
static size_t oldibufsize;
size_t ibufsize;
struct fs *sblock;
ino_t inumber, maxino;
static daddr_t dblk;
char sbuf[SBSIZE];
int devfd, n;
char *devpath;
/* Open device and read in superblock */
if ((devfd = opendev(device, printonly ? O_RDONLY : O_RDWR,
OPENDEV_PART, &devpath)) < 0)
err(1, "Can't open %s", devpath);
(void)memset(&sbuf, 0, sizeof(sbuf));
sblock = (struct fs *)&sbuf;
if (lseek(devfd, SBOFF, SEEK_SET) == -1)
err(1, "Can't seek to superblock (%qd) on %s", SBOFF, devpath);
if ((n = read(devfd, (void *)sblock, SBSIZE)) != SBSIZE)
err(1, "Can't read superblock on %s: %s", devpath,
(n < SBSIZE) ? "short read" : strerror(errno));
/* Simple sanity checks on the superblock */
if (sblock->fs_magic != FS_MAGIC)
errx(1, "Wrong magic number in superblock");
if (sblock->fs_sbsize > SBSIZE)
errx(1, "Superblock size is preposterous");
if (!force && !printonly && sblock->fs_clean != FS_ISCLEAN)
errx(1, "Filesystem is not clean, fsck %s before running %s\n",
devpath, __progname);
maxino = sblock->fs_ncg * sblock->fs_ipg;
ibufsize = sizeof(struct dinode) * sblock->fs_ipg;
if (oldibufsize < ibufsize) {
if ((inodebuf = realloc(inodebuf, ibufsize)) == NULL)
errx(1, "Can't allocate memory for inode buffer");
oldibufsize = ibufsize;
}
/* Randomize inodes a cylinder group at a time */
for (inumber = 0; inumber < maxino;) {
/* Read in inodes, then print or randomize generation nums */
dblk = fsbtodb(sblock, ino_to_fsba(sblock, inumber));
/* XXX - don't use DEV_BSIZE, get value from disklabel! */
if (lseek(devfd, (off_t)(dblk * DEV_BSIZE), SEEK_SET) < 0) {
warn("Can't seek to %qd", (off_t)(dblk * DEV_BSIZE));
return;
} else if ((n = read(devfd, inodebuf, ibufsize)) != ibufsize) {
warnx("Can't read inodes: %s",
(n < ibufsize) ? "short read" : strerror(errno));
return;
}
for (n = 0; n < sblock->fs_ipg; n++, inumber++) {
if (inumber >= ROOTINO) {
if (printonly)
(void)printf("ino %d gen %x\n", inumber,
inodebuf[n].di_gen);
else
inodebuf[n].di_gen = arc4random();
}
}
/* Write out modified inodes */
if (!printonly) {
/* XXX - don't use DEV_BSIZE, get from disklabel! */
if (lseek(devfd, (off_t)(dblk * DEV_BSIZE), SEEK_SET) < 0) {
warn("Can't seek to %qd",
(off_t)(dblk * DEV_BSIZE));
return;
} else if ((n = write(devfd, inodebuf, ibufsize)) !=
ibufsize) {
errx(1, "Can't write inodes: %s",
(n != ibufsize) ? "short write" :
strerror(errno));
return;
}
}
}
(void)close(devfd);
}
void
usage(ex)
int ex;
{
(void)fprintf(stderr, "Usage: %s [ -p ] special [special ...]\n",
__progname);
exit(ex);
}
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