1 /* $OpenBSD: fsirand.c,v 1.9 1997/02/28 00:46:33 millert Exp $ */
4 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
6 * Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com>
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 * must display the following acknowledgement:
19 * This product includes software developed by Todd C. Miller.
20 * 4. The name of the author may not be used to endorse or promote products
21 * derived from this software without specific prior written permission.
23 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
24 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
25 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
26 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
27 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
28 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
29 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
30 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
31 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
32 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 static const char rcsid[] =
40 #include <sys/param.h>
41 #include <sys/resource.h>
43 #include <ufs/ufs/dinode.h>
44 #include <ufs/ffs/fs.h>
57 static void usage(void) __dead2;
60 static int printonly = 0, force = 0, ignorelabel = 0;
63 main(int argc, char *argv[])
68 while ((n = getopt(argc, argv, "bfp")) != -1) {
83 if (argc - optind < 1)
88 /* Increase our data size to the max */
89 if (getrlimit(RLIMIT_DATA, &rl) == 0) {
90 rl.rlim_cur = rl.rlim_max;
91 if (setrlimit(RLIMIT_DATA, &rl) < 0)
92 warn("can't get resource limit to max data size");
94 warn("can't get resource limit for data size");
96 for (n = optind; n < argc; n++) {
97 if (argc - optind != 1)
99 ex += fsirand(argv[n]);
108 fsirand(char *device)
110 struct ufs1_dinode *dp1;
111 struct ufs2_dinode *dp2;
117 int devfd, n, cg, ret;
118 u_int32_t bsize = DEV_BSIZE;
120 if ((devfd = open(device, printonly ? O_RDONLY : O_RDWR)) < 0) {
121 warn("can't open %s", device);
128 /* Read in master superblock */
129 if ((ret = sbget(devfd, &sblock, -1)) != 0) {
132 warn("Cannot find file system superblock");
135 warn("Unable to read file system superblock");
140 if (sblock->fs_magic == FS_UFS1_MAGIC &&
141 sblock->fs_old_inodefmt < FS_44INODEFMT) {
142 warnx("file system format is too old, sorry");
145 if (!force && !printonly && sblock->fs_clean != 1) {
146 warnx("file system is not clean, fsck %s first", device);
150 /* XXX - should really cap buffer at 512kb or so */
151 if (sblock->fs_magic == FS_UFS1_MAGIC)
152 ibufsize = sizeof(struct ufs1_dinode) * sblock->fs_ipg;
154 ibufsize = sizeof(struct ufs2_dinode) * sblock->fs_ipg;
155 if ((inodebuf = malloc(ibufsize)) == NULL)
156 errx(1, "can't allocate memory for inode buffer");
158 if (printonly && (sblock->fs_id[0] || sblock->fs_id[1])) {
159 if (sblock->fs_id[0])
160 (void)printf("%s was randomized on %s", device,
161 ctime((void *)&(sblock->fs_id[0])));
162 (void)printf("fsid: %x %x\n", sblock->fs_id[0],
166 /* Randomize fs_id unless old 4.2BSD file system */
168 /* Randomize fs_id and write out new sblock and backups */
169 sblock->fs_id[0] = (u_int32_t)time(NULL);
170 sblock->fs_id[1] = random();
171 if (sbput(devfd, sblock, sblock->fs_ncg) != 0) {
172 warn("could not write updated superblock");
177 /* For each cylinder group, randomize inodes and update backup sblock */
178 for (cg = 0, inumber = 0; cg < (int)sblock->fs_ncg; cg++) {
179 /* Read in inodes, then print or randomize generation nums */
180 dblk = fsbtodb(sblock, ino_to_fsba(sblock, inumber));
181 if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) {
182 warn("can't seek to %jd", (intmax_t)dblk * bsize);
184 } else if ((n = read(devfd, inodebuf, ibufsize)) != ibufsize) {
185 warnx("can't read inodes: %s",
186 (n < ibufsize) ? "short read" : strerror(errno));
190 for (n = 0; n < (int)sblock->fs_ipg; n++, inumber++) {
191 if (sblock->fs_magic == FS_UFS1_MAGIC)
192 dp1 = &((struct ufs1_dinode *)inodebuf)[n];
194 dp2 = &((struct ufs2_dinode *)inodebuf)[n];
195 if (inumber >= UFS_ROOTINO) {
197 (void)printf("ino %ju gen %08x\n",
199 sblock->fs_magic == FS_UFS1_MAGIC ?
200 dp1->di_gen : dp2->di_gen);
201 else if (sblock->fs_magic == FS_UFS1_MAGIC)
202 dp1->di_gen = random();
204 dp2->di_gen = random();
208 /* Write out modified inodes */
210 if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) {
211 warn("can't seek to %jd",
212 (intmax_t)dblk * bsize);
214 } else if ((n = write(devfd, inodebuf, ibufsize)) !=
216 warnx("can't write inodes: %s",
217 (n != ibufsize) ? "short write" :
231 (void)fprintf(stderr,
232 "usage: fsirand [-b] [-f] [-p] special [special ...]\n");