freebsd-dev/sbin/fsirand/fsirand.c
1997-06-14 00:17:53 +00:00

294 lines
8.4 KiB
C

/* $OpenBSD: fsirand.c,v 1.9 1997/02/28 00:46:33 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 1.9 1997/02/28 00:46:33 millert Exp $";
#endif /* not lint */
#include <sys/types.h>
#include <sys/disklabel.h>
#include <sys/ioctl.h>
#include <sys/param.h>
#include <sys/time.h>
#include <sys/resource.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 <time.h>
#include <unistd.h>
static void usage __P((int));
int fsirand __P((char *));
int printonly = 0, force = 0, ignorelabel = 0;
int
main(argc, argv)
int argc;
char *argv[];
{
int n, ex = 0;
struct rlimit rl;
while ((n = getopt(argc, argv, "bfp")) != -1) {
switch (n) {
case 'b':
ignorelabel++;
break;
case 'p':
printonly++;
break;
case 'f':
force++;
break;
default:
usage(1);
}
}
if (argc - optind < 1)
usage(1);
srandomdev();
/* Increase our data size to the max */
if (getrlimit(RLIMIT_DATA, &rl) == 0) {
rl.rlim_cur = rl.rlim_max;
if (setrlimit(RLIMIT_DATA, &rl) < 0)
warn("Can't get resource limit to max data size");
} else
warn("Can't get resource limit for data size");
for (n = optind; n < argc; n++) {
if (argc - optind != 1)
(void)puts(argv[n]);
ex += fsirand(argv[n]);
if (n < argc - 1)
putchar('\n');
}
exit(ex);
}
int
fsirand(device)
char *device;
{
static struct dinode *inodebuf;
static size_t oldibufsize;
size_t ibufsize;
struct fs *sblock;
ino_t inumber, maxino;
daddr_t dblk;
char sbuf[SBSIZE], sbuftmp[SBSIZE];
int devfd, n, cg;
u_int32_t bsize = DEV_BSIZE;
struct disklabel label;
if ((devfd = open(device, printonly ? O_RDONLY : O_RDWR)) < 0) {
warn("Can't open %s", device);
return (1);
}
/* Get block size (usually 512) from disklabel if possible */
if (!ignorelabel) {
if (ioctl(devfd, DIOCGDINFO, &label) < 0)
warn("Can't read disklabel, using sector size of %d",
bsize);
else
bsize = label.d_secsize;
}
/* Read in master superblock */
(void)memset(&sbuf, 0, sizeof(sbuf));
sblock = (struct fs *)&sbuf;
if (lseek(devfd, SBOFF, SEEK_SET) == -1) {
warn("Can't seek to superblock (%qd) on %s", SBOFF, device);
return (1);
}
if ((n = read(devfd, (void *)sblock, SBSIZE)) != SBSIZE) {
warnx("Can't read superblock on %s: %s", device,
(n < SBSIZE) ? "short read" : strerror(errno));
return (1);
}
maxino = sblock->fs_ncg * sblock->fs_ipg;
/* Simple sanity checks on the superblock */
if (sblock->fs_magic != FS_MAGIC) {
warnx("Bad magic number in superblock");
return (1);
}
if (sblock->fs_sbsize > SBSIZE) {
warnx("Superblock size is preposterous");
return (1);
}
if (sblock->fs_postblformat == FS_42POSTBLFMT) {
warnx("Filesystem format is too old, sorry");
return (1);
}
if (!force && !printonly && sblock->fs_clean != 1) {
warnx("Filesystem is not clean, fsck %s first.", device);
return (1);
}
/* Make sure backup superblocks are sane. */
sblock = (struct fs *)&sbuftmp;
for (cg = 0; cg < sblock->fs_ncg; cg++) {
dblk = fsbtodb(sblock, cgsblock(sblock, cg));
if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) {
warn("Can't seek to %qd", (off_t)dblk * bsize);
return (1);
} else if ((n = write(devfd, (void *)sblock, SBSIZE)) != SBSIZE) {
warn("Can't read backup superblock %d on %s: %s",
cg + 1, device, (n < SBSIZE) ? "short write"
: strerror(errno));
return (1);
}
if (sblock->fs_magic != FS_MAGIC) {
warnx("Bad magic number in backup superblock %d on %s",
cg + 1, device);
return (1);
}
if (sblock->fs_sbsize > SBSIZE) {
warnx("Size of backup superblock %d on %s is preposterous",
cg + 1, device);
return (1);
}
}
sblock = (struct fs *)&sbuf;
/* XXX - should really cap buffer at 512kb or so */
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;
}
if (printonly && (sblock->fs_id[0] || sblock->fs_id[1])) {
if (sblock->fs_inodefmt >= FS_44INODEFMT && sblock->fs_id[0])
(void)printf("%s was randomized on %s", device,
ctime((const time_t *)&(sblock->fs_id[0])));
(void)printf("fsid: %x %x\n", sblock->fs_id[0],
sblock->fs_id[1]);
}
/* Randomize fs_id unless old 4.2BSD filesystem */
if ((sblock->fs_inodefmt >= FS_44INODEFMT) && !printonly) {
/* Randomize fs_id and write out new sblock and backups */
sblock->fs_id[0] = (u_int32_t)time(NULL);
sblock->fs_id[1] = random();
if (lseek(devfd, SBOFF, SEEK_SET) == -1) {
warn("Can't seek to superblock (%qd) on %s", SBOFF,
device);
return (1);
}
if ((n = write(devfd, (void *)sblock, SBSIZE)) != SBSIZE) {
warn("Can't read superblock on %s: %s", device,
(n < SBSIZE) ? "short write" : strerror(errno));
return (1);
}
}
/* For each cylinder group, randomize inodes and update backup sblock */
for (cg = 0, inumber = 0; cg < sblock->fs_ncg; cg++) {
/* Update superblock if appropriate */
if ((sblock->fs_inodefmt >= FS_44INODEFMT) && !printonly) {
dblk = fsbtodb(sblock, cgsblock(sblock, cg));
if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) {
warn("Can't seek to %qd", (off_t)dblk * bsize);
return (1);
} else if ((n = write(devfd, (void *)sblock, SBSIZE)) != SBSIZE) {
warn("Can't read backup superblock %d on %s: %s",
cg + 1, device, (n < SBSIZE) ? "short write"
: strerror(errno));
return (1);
}
}
/* Read in inodes, then print or randomize generation nums */
dblk = fsbtodb(sblock, ino_to_fsba(sblock, inumber));
if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) {
warn("Can't seek to %qd", (off_t)dblk * bsize);
return (1);
} else if ((n = read(devfd, inodebuf, ibufsize)) != ibufsize) {
warnx("Can't read inodes: %s",
(n < ibufsize) ? "short read" : strerror(errno));
return (1);
}
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 = random();
}
}
/* Write out modified inodes */
if (!printonly) {
if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) {
warn("Can't seek to %qd",
(off_t)dblk * bsize);
return (1);
} else if ((n = write(devfd, inodebuf, ibufsize)) !=
ibufsize) {
warnx("Can't write inodes: %s",
(n != ibufsize) ? "short write" :
strerror(errno));
return (1);
}
}
}
(void)close(devfd);
return(0);
}
static void
usage(ex)
int ex;
{
(void)fprintf(stderr,
"usage: fsirand [ -b ] [ -f ] [ -p ] special [special ...]\n");
exit(ex);
}