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)
86 /* Increase our data size to the max */
87 if (getrlimit(RLIMIT_DATA, &rl) == 0) {
88 rl.rlim_cur = rl.rlim_max;
89 if (setrlimit(RLIMIT_DATA, &rl) < 0)
90 warn("can't get resource limit to max data size");
92 warn("can't get resource limit for data size");
94 for (n = optind; n < argc; n++) {
95 if (argc - optind != 1)
97 ex += fsirand(argv[n]);
106 fsirand(char *device)
108 struct ufs1_dinode *dp1;
109 struct ufs2_dinode *dp2;
115 int devfd, n, cg, ret;
116 u_int32_t bsize = DEV_BSIZE;
118 if ((devfd = open(device, printonly ? O_RDONLY : O_RDWR)) < 0) {
119 warn("can't open %s", device);
126 /* Read in master superblock */
127 if ((ret = sbget(devfd, &sblock, STDSB)) != 0) {
130 warn("Cannot find file system superblock");
133 warn("Unable to read file system superblock");
138 * Check for unclean filesystem.
140 if (sblock->fs_clean == 0 ||
141 (sblock->fs_flags & (FS_UNCLEAN | FS_NEEDSFSCK)) != 0)
142 errx(1, "%s is not clean - run fsck.\n", device);
144 if (sblock->fs_magic == FS_UFS1_MAGIC &&
145 sblock->fs_old_inodefmt < FS_44INODEFMT) {
146 warnx("file system format is too old, sorry");
149 if (!force && !printonly && sblock->fs_clean != 1) {
150 warnx("file system is not clean, fsck %s first", device);
154 /* XXX - should really cap buffer at 512kb or so */
155 if (sblock->fs_magic == FS_UFS1_MAGIC)
156 ibufsize = sizeof(struct ufs1_dinode) * sblock->fs_ipg;
158 ibufsize = sizeof(struct ufs2_dinode) * sblock->fs_ipg;
159 if ((inodebuf = malloc(ibufsize)) == NULL)
160 errx(1, "can't allocate memory for inode buffer");
162 if (printonly && (sblock->fs_id[0] || sblock->fs_id[1])) {
163 if (sblock->fs_id[0])
164 (void)printf("%s was randomized on %s", device,
165 ctime((void *)&(sblock->fs_id[0])));
166 (void)printf("fsid: %x %x\n", sblock->fs_id[0],
170 /* Randomize fs_id unless old 4.2BSD file system */
172 /* Randomize fs_id and write out new sblock and backups */
173 sblock->fs_id[0] = (u_int32_t)time(NULL);
174 sblock->fs_id[1] = arc4random();
175 if (sbput(devfd, sblock, sblock->fs_ncg) != 0) {
176 warn("could not write updated superblock");
181 /* For each cylinder group, randomize inodes and update backup sblock */
182 for (cg = 0, inumber = UFS_ROOTINO; cg < (int)sblock->fs_ncg; cg++) {
183 /* Read in inodes, then print or randomize generation nums */
184 dblk = fsbtodb(sblock, ino_to_fsba(sblock, inumber));
185 if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) {
186 warn("can't seek to %jd", (intmax_t)dblk * bsize);
188 } else if ((n = read(devfd, inodebuf, ibufsize)) != ibufsize) {
189 warnx("can't read inodes: %s",
190 (n < ibufsize) ? "short read" : strerror(errno));
194 dp1 = (struct ufs1_dinode *)(void *)inodebuf;
195 dp2 = (struct ufs2_dinode *)(void *)inodebuf;
196 for (n = cg > 0 ? 0 : UFS_ROOTINO;
197 n < (int)sblock->fs_ipg;
200 (void)printf("ino %ju gen %08x\n",
202 sblock->fs_magic == FS_UFS1_MAGIC ?
203 dp1->di_gen : dp2->di_gen);
204 } else if (sblock->fs_magic == FS_UFS1_MAGIC) {
205 dp1->di_gen = arc4random();
208 dp2->di_gen = arc4random();
209 ffs_update_dinode_ckhash(sblock, dp2);
214 /* Write out modified inodes */
216 if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) {
217 warn("can't seek to %jd",
218 (intmax_t)dblk * bsize);
220 } else if ((n = write(devfd, inodebuf, ibufsize)) !=
222 warnx("can't write inodes: %s",
223 (n != ibufsize) ? "short write" :
237 (void)fprintf(stderr,
238 "usage: fsirand [-b] [-f] [-p] special [special ...]\n");