1 /* $OpenBSD: fsirand.c,v 1.9 1997/02/28 00:46:33 millert Exp $ */
4 * Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgement:
17 * This product includes software developed by Todd C. Miller.
18 * 4. The name of the author may not be used to endorse or promote products
19 * derived from this software without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
22 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
23 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
24 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
25 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
26 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
27 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
28 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
29 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
30 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 static const char rcsid[] =
38 #include <sys/disklabel.h>
39 #include <sys/param.h>
41 #include <sys/resource.h>
43 #include <ufs/ffs/fs.h>
44 #include <ufs/ufs/dinode.h>
54 static void usage(void) __dead2;
57 int printonly = 0, force = 0, ignorelabel = 0;
60 main(int argc, char *argv[])
65 while ((n = getopt(argc, argv, "bfp")) != -1) {
80 if (argc - optind < 1)
85 /* Increase our data size to the max */
86 if (getrlimit(RLIMIT_DATA, &rl) == 0) {
87 rl.rlim_cur = rl.rlim_max;
88 if (setrlimit(RLIMIT_DATA, &rl) < 0)
89 warn("can't get resource limit to max data size");
91 warn("can't get resource limit for data size");
93 for (n = optind; n < argc; n++) {
94 if (argc - optind != 1)
96 ex += fsirand(argv[n]);
105 fsirand(char *device)
107 static struct dinode *inodebuf;
108 static size_t oldibufsize;
111 ino_t inumber, maxino;
113 char sbuf[SBSIZE], sbuftmp[SBSIZE];
115 u_int32_t bsize = DEV_BSIZE;
116 struct disklabel label;
118 if ((devfd = open(device, printonly ? O_RDONLY : O_RDWR)) < 0) {
119 warn("can't open %s", device);
123 /* Get block size (usually 512) from disklabel if possible */
125 if (ioctl(devfd, DIOCGDINFO, &label) < 0)
126 warn("can't read disklabel, using sector size of %d",
129 bsize = label.d_secsize;
132 /* Read in master superblock */
133 (void)memset(&sbuf, 0, sizeof(sbuf));
134 sblock = (struct fs *)&sbuf;
135 if (lseek(devfd, SBOFF, SEEK_SET) == -1) {
136 warn("can't seek to superblock (%qd) on %s", SBOFF, device);
139 if ((n = read(devfd, (void *)sblock, SBSIZE)) != SBSIZE) {
140 warnx("can't read superblock on %s: %s", device,
141 (n < SBSIZE) ? "short read" : strerror(errno));
144 maxino = sblock->fs_ncg * sblock->fs_ipg;
146 /* Simple sanity checks on the superblock */
147 if (sblock->fs_magic != FS_MAGIC) {
148 warnx("bad magic number in superblock");
151 if (sblock->fs_sbsize > SBSIZE) {
152 warnx("superblock size is preposterous");
155 if (sblock->fs_postblformat == FS_42POSTBLFMT) {
156 warnx("filesystem format is too old, sorry");
159 if (!force && !printonly && sblock->fs_clean != 1) {
160 warnx("filesystem is not clean, fsck %s first", device);
164 /* Make sure backup superblocks are sane. */
165 sblock = (struct fs *)&sbuftmp;
166 for (cg = 0; cg < sblock->fs_ncg; cg++) {
167 dblk = fsbtodb(sblock, cgsblock(sblock, cg));
168 if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) {
169 warn("can't seek to %qd", (off_t)dblk * bsize);
171 } else if ((n = write(devfd, (void *)sblock, SBSIZE)) != SBSIZE) {
172 warn("can't read backup superblock %d on %s: %s",
173 cg + 1, device, (n < SBSIZE) ? "short write"
177 if (sblock->fs_magic != FS_MAGIC) {
178 warnx("bad magic number in backup superblock %d on %s",
182 if (sblock->fs_sbsize > SBSIZE) {
183 warnx("size of backup superblock %d on %s is preposterous",
188 sblock = (struct fs *)&sbuf;
190 /* XXX - should really cap buffer at 512kb or so */
191 ibufsize = sizeof(struct dinode) * sblock->fs_ipg;
192 if (oldibufsize < ibufsize) {
193 if ((inodebuf = realloc(inodebuf, ibufsize)) == NULL)
194 errx(1, "can't allocate memory for inode buffer");
195 oldibufsize = ibufsize;
198 if (printonly && (sblock->fs_id[0] || sblock->fs_id[1])) {
199 if (sblock->fs_inodefmt >= FS_44INODEFMT && sblock->fs_id[0])
200 (void)printf("%s was randomized on %s", device,
201 ctime((const time_t *)&(sblock->fs_id[0])));
202 (void)printf("fsid: %x %x\n", sblock->fs_id[0],
206 /* Randomize fs_id unless old 4.2BSD filesystem */
207 if ((sblock->fs_inodefmt >= FS_44INODEFMT) && !printonly) {
208 /* Randomize fs_id and write out new sblock and backups */
209 sblock->fs_id[0] = (u_int32_t)time(NULL);
210 sblock->fs_id[1] = random();
212 if (lseek(devfd, SBOFF, SEEK_SET) == -1) {
213 warn("can't seek to superblock (%qd) on %s", SBOFF,
217 if ((n = write(devfd, (void *)sblock, SBSIZE)) != SBSIZE) {
218 warn("can't read superblock on %s: %s", device,
219 (n < SBSIZE) ? "short write" : strerror(errno));
224 /* For each cylinder group, randomize inodes and update backup sblock */
225 for (cg = 0, inumber = 0; cg < sblock->fs_ncg; cg++) {
226 /* Update superblock if appropriate */
227 if ((sblock->fs_inodefmt >= FS_44INODEFMT) && !printonly) {
228 dblk = fsbtodb(sblock, cgsblock(sblock, cg));
229 if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) {
230 warn("can't seek to %qd", (off_t)dblk * bsize);
232 } else if ((n = write(devfd, (void *)sblock, SBSIZE)) != SBSIZE) {
233 warn("can't read backup superblock %d on %s: %s",
234 cg + 1, device, (n < SBSIZE) ? "short write"
240 /* Read in inodes, then print or randomize generation nums */
241 dblk = fsbtodb(sblock, ino_to_fsba(sblock, inumber));
242 if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) {
243 warn("can't seek to %qd", (off_t)dblk * bsize);
245 } else if ((n = read(devfd, inodebuf, ibufsize)) != ibufsize) {
246 warnx("can't read inodes: %s",
247 (n < ibufsize) ? "short read" : strerror(errno));
251 for (n = 0; n < sblock->fs_ipg; n++, inumber++) {
252 if (inumber >= ROOTINO) {
254 (void)printf("ino %d gen %x\n", inumber,
257 inodebuf[n].di_gen = random();
261 /* Write out modified inodes */
263 if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) {
264 warn("can't seek to %qd",
265 (off_t)dblk * bsize);
267 } else if ((n = write(devfd, inodebuf, ibufsize)) !=
269 warnx("can't write inodes: %s",
270 (n != ibufsize) ? "short write" :
284 (void)fprintf(stderr,
285 "usage: fsirand [-b] [-f] [-p] special [special ...]\n");