295 lines
8.5 KiB
C
295 lines
8.5 KiB
C
/* $OpenBSD: fsirand.c,v 1.9 1997/02/28 00:46:33 millert Exp $ */
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/*
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* Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Todd C. Miller.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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* THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef lint
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static char rcsid[] = "$OpenBSD: fsirand.c,v 1.9 1997/02/28 00:46:33 millert Exp $";
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#endif /* not lint */
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#include <sys/types.h>
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#include <sys/disklabel.h>
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#include <sys/ioctl.h>
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#include <sys/param.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <ufs/ffs/fs.h>
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#include <ufs/ufs/dinode.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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void usage __P((int));
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int fsirand __P((char *));
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int printonly = 0, force = 0, ignorelabel = 0;
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int
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main(argc, argv)
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int argc;
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char *argv[];
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{
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int n, ex = 0;
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struct rlimit rl;
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while ((n = getopt(argc, argv, "bfp")) != -1) {
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switch (n) {
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case 'b':
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ignorelabel++;
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break;
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case 'p':
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printonly++;
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break;
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case 'f':
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force++;
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break;
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default:
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usage(1);
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}
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}
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if (argc - optind < 1)
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usage(1);
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if (srandomdev() < 0)
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srandom(time(NULL) ^ getpid());
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/* Increase our data size to the max */
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if (getrlimit(RLIMIT_DATA, &rl) == 0) {
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rl.rlim_cur = rl.rlim_max;
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if (setrlimit(RLIMIT_DATA, &rl) < 0)
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warn("Can't get resource limit to max data size");
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} else
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warn("Can't get resource limit for data size");
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for (n = optind; n < argc; n++) {
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if (argc - optind != 1)
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(void)puts(argv[n]);
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ex += fsirand(argv[n]);
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if (n < argc - 1)
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putchar('\n');
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}
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exit(ex);
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}
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int
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fsirand(device)
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char *device;
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{
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static struct dinode *inodebuf;
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static size_t oldibufsize;
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size_t ibufsize;
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struct fs *sblock;
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ino_t inumber, maxino;
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daddr_t dblk;
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char sbuf[SBSIZE], sbuftmp[SBSIZE];
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int devfd, n, cg;
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u_int32_t bsize = DEV_BSIZE;
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struct disklabel label;
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if ((devfd = open(device, printonly ? O_RDONLY : O_RDWR)) < 0) {
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warn("Can't open %s", device);
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return (1);
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}
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/* Get block size (usually 512) from disklabel if possible */
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if (!ignorelabel) {
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if (ioctl(devfd, DIOCGDINFO, &label) < 0)
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warn("Can't read disklabel, using sector size of %d",
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bsize);
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else
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bsize = label.d_secsize;
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}
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/* Read in master superblock */
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(void)memset(&sbuf, 0, sizeof(sbuf));
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sblock = (struct fs *)&sbuf;
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if (lseek(devfd, SBOFF, SEEK_SET) == -1) {
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warn("Can't seek to superblock (%qd) on %s", SBOFF, device);
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return (1);
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}
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if ((n = read(devfd, (void *)sblock, SBSIZE)) != SBSIZE) {
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warnx("Can't read superblock on %s: %s", device,
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(n < SBSIZE) ? "short read" : strerror(errno));
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return (1);
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}
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maxino = sblock->fs_ncg * sblock->fs_ipg;
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/* Simple sanity checks on the superblock */
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if (sblock->fs_magic != FS_MAGIC) {
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warnx("Bad magic number in superblock");
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return (1);
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}
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if (sblock->fs_sbsize > SBSIZE) {
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warnx("Superblock size is preposterous");
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return (1);
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}
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if (sblock->fs_postblformat == FS_42POSTBLFMT) {
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warnx("Filesystem format is too old, sorry");
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return (1);
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}
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if (!force && !printonly && sblock->fs_clean != 1) {
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warnx("Filesystem is not clean, fsck %s first.", device);
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return (1);
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}
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/* Make sure backup superblocks are sane. */
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sblock = (struct fs *)&sbuftmp;
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for (cg = 0; cg < sblock->fs_ncg; cg++) {
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dblk = fsbtodb(sblock, cgsblock(sblock, cg));
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if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) {
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warn("Can't seek to %qd", (off_t)dblk * bsize);
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return (1);
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} else if ((n = write(devfd, (void *)sblock, SBSIZE)) != SBSIZE) {
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warn("Can't read backup superblock %d on %s: %s",
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cg + 1, device, (n < SBSIZE) ? "short write"
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: strerror(errno));
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return (1);
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}
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if (sblock->fs_magic != FS_MAGIC) {
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warnx("Bad magic number in backup superblock %d on %s",
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cg + 1, device);
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return (1);
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}
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if (sblock->fs_sbsize > SBSIZE) {
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warnx("Size of backup superblock %d on %s is preposterous",
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cg + 1, device);
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return (1);
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}
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}
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sblock = (struct fs *)&sbuf;
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/* XXX - should really cap buffer at 512kb or so */
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ibufsize = sizeof(struct dinode) * sblock->fs_ipg;
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if (oldibufsize < ibufsize) {
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if ((inodebuf = realloc(inodebuf, ibufsize)) == NULL)
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errx(1, "Can't allocate memory for inode buffer");
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oldibufsize = ibufsize;
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}
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if (printonly && (sblock->fs_id[0] || sblock->fs_id[1])) {
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if (sblock->fs_inodefmt >= FS_44INODEFMT && sblock->fs_id[0])
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(void)printf("%s was randomized on %s", device,
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ctime((const time_t *)&(sblock->fs_id[0])));
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(void)printf("fsid: %x %x\n", sblock->fs_id[0],
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sblock->fs_id[1]);
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}
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/* Randomize fs_id unless old 4.2BSD filesystem */
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if ((sblock->fs_inodefmt >= FS_44INODEFMT) && !printonly) {
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/* Randomize fs_id and write out new sblock and backups */
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sblock->fs_id[0] = (u_int32_t)time(NULL);
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sblock->fs_id[1] = random();
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if (lseek(devfd, SBOFF, SEEK_SET) == -1) {
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warn("Can't seek to superblock (%qd) on %s", SBOFF,
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device);
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return (1);
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}
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if ((n = write(devfd, (void *)sblock, SBSIZE)) != SBSIZE) {
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warn("Can't read superblock on %s: %s", device,
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(n < SBSIZE) ? "short write" : strerror(errno));
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return (1);
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}
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}
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/* For each cylinder group, randomize inodes and update backup sblock */
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for (cg = 0, inumber = 0; cg < sblock->fs_ncg; cg++) {
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/* Update superblock if appropriate */
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if ((sblock->fs_inodefmt >= FS_44INODEFMT) && !printonly) {
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dblk = fsbtodb(sblock, cgsblock(sblock, cg));
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if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) {
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warn("Can't seek to %qd", (off_t)dblk * bsize);
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return (1);
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} else if ((n = write(devfd, (void *)sblock, SBSIZE)) != SBSIZE) {
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warn("Can't read backup superblock %d on %s: %s",
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cg + 1, device, (n < SBSIZE) ? "short write"
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: strerror(errno));
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return (1);
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}
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}
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/* Read in inodes, then print or randomize generation nums */
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dblk = fsbtodb(sblock, ino_to_fsba(sblock, inumber));
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if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) {
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warn("Can't seek to %qd", (off_t)dblk * bsize);
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return (1);
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} else if ((n = read(devfd, inodebuf, ibufsize)) != ibufsize) {
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warnx("Can't read inodes: %s",
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(n < ibufsize) ? "short read" : strerror(errno));
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return (1);
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}
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for (n = 0; n < sblock->fs_ipg; n++, inumber++) {
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if (inumber >= ROOTINO) {
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if (printonly)
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(void)printf("ino %d gen %x\n", inumber,
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inodebuf[n].di_gen);
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else
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inodebuf[n].di_gen = random();
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}
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}
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/* Write out modified inodes */
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if (!printonly) {
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if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) {
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warn("Can't seek to %qd",
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(off_t)dblk * bsize);
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return (1);
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} else if ((n = write(devfd, inodebuf, ibufsize)) !=
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ibufsize) {
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warnx("Can't write inodes: %s",
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(n != ibufsize) ? "short write" :
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strerror(errno));
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return (1);
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}
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}
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}
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(void)close(devfd);
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return(0);
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}
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void
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usage(ex)
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int ex;
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{
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(void)fprintf(stderr,
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"Usage: fsirand [ -b ] [ -f ] [ -p ] special [special ...]\n");
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exit(ex);
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}
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