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/ufs/dinode.h>
44 #include <ufs/ffs/fs.h>
54 static void usage(void) __dead2;
58 * Possible superblock locations ordered from most to least likely.
60 static int sblock_try[] = SBLOCKSEARCH;
62 int printonly = 0, force = 0, ignorelabel = 0;
65 main(int argc, char *argv[])
70 while ((n = getopt(argc, argv, "bfp")) != -1) {
85 if (argc - optind < 1)
90 /* Increase our data size to the max */
91 if (getrlimit(RLIMIT_DATA, &rl) == 0) {
92 rl.rlim_cur = rl.rlim_max;
93 if (setrlimit(RLIMIT_DATA, &rl) < 0)
94 warn("can't get resource limit to max data size");
96 warn("can't get resource limit for data size");
98 for (n = optind; n < argc; n++) {
99 if (argc - optind != 1)
101 ex += fsirand(argv[n]);
110 fsirand(char *device)
112 struct ufs1_dinode *dp1;
113 struct ufs2_dinode *dp2;
117 ino_t inumber, maxino;
118 ufs2_daddr_t sblockloc, dblk;
119 char sbuf[SBLOCKSIZE], sbuftmp[SBLOCKSIZE];
121 u_int32_t bsize = DEV_BSIZE;
122 struct disklabel label;
124 if ((devfd = open(device, printonly ? O_RDONLY : O_RDWR)) < 0) {
125 warn("can't open %s", device);
129 /* Get block size (usually 512) from disklabel if possible */
131 if (ioctl(devfd, DIOCGDINFO, &label) < 0)
132 warn("can't read disklabel, using sector size of %d",
135 bsize = label.d_secsize;
138 /* Read in master superblock */
139 (void)memset(&sbuf, 0, sizeof(sbuf));
140 sblock = (struct fs *)&sbuf;
141 for (i = 0; sblock_try[i] != -1; i++) {
142 sblockloc = sblock_try[i];
143 if (lseek(devfd, sblockloc, SEEK_SET) == -1) {
144 warn("can't seek to superblock (%qd) on %s",
148 if ((n = read(devfd, (void *)sblock, SBLOCKSIZE))!=SBLOCKSIZE) {
149 warnx("can't read superblock on %s: %s", device,
150 (n < SBLOCKSIZE) ? "short read" : strerror(errno));
153 if ((sblock->fs_magic == FS_UFS1_MAGIC ||
154 (sblock->fs_magic == FS_UFS2_MAGIC &&
155 sblock->fs_sblockloc == sblock_try[i])) &&
156 sblock->fs_bsize <= MAXBSIZE &&
157 sblock->fs_bsize >= sizeof(struct fs))
160 if (sblock_try[i] == -1) {
161 fprintf(stderr, "Cannot find file system superblock\n");
164 maxino = sblock->fs_ncg * sblock->fs_ipg;
166 if (sblock->fs_magic == FS_UFS1_MAGIC &&
167 sblock->fs_old_inodefmt < FS_44INODEFMT) {
168 warnx("file system format is too old, sorry");
171 if (!force && !printonly && sblock->fs_clean != 1) {
172 warnx("file system is not clean, fsck %s first", device);
176 /* Make sure backup superblocks are sane. */
177 sblock = (struct fs *)&sbuftmp;
178 for (cg = 0; cg < sblock->fs_ncg; cg++) {
179 dblk = fsbtodb(sblock, cgsblock(sblock, cg));
180 if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) {
181 warn("can't seek to %qd", (off_t)dblk * bsize);
183 } else if ((n = write(devfd, (void *)sblock, SBLOCKSIZE)) != SBLOCKSIZE) {
184 warn("can't read backup superblock %d on %s: %s",
185 cg + 1, device, (n < SBLOCKSIZE) ? "short write"
189 if (sblock->fs_magic != FS_UFS1_MAGIC &&
190 sblock->fs_magic != FS_UFS2_MAGIC) {
191 warnx("bad magic number in backup superblock %d on %s",
195 if (sblock->fs_sbsize > SBLOCKSIZE) {
196 warnx("size of backup superblock %d on %s is preposterous",
201 sblock = (struct fs *)&sbuf;
203 /* XXX - should really cap buffer at 512kb or so */
204 if (sblock->fs_magic == FS_UFS1_MAGIC)
205 ibufsize = sizeof(struct ufs1_dinode) * sblock->fs_ipg;
207 ibufsize = sizeof(struct ufs2_dinode) * sblock->fs_ipg;
208 if ((inodebuf = malloc(ibufsize)) == NULL)
209 errx(1, "can't allocate memory for inode buffer");
211 if (printonly && (sblock->fs_id[0] || sblock->fs_id[1])) {
212 if (sblock->fs_id[0])
213 (void)printf("%s was randomized on %s", device,
214 ctime((const time_t *)&(sblock->fs_id[0])));
215 (void)printf("fsid: %x %x\n", sblock->fs_id[0],
219 /* Randomize fs_id unless old 4.2BSD file system */
221 /* Randomize fs_id and write out new sblock and backups */
222 sblock->fs_id[0] = (u_int32_t)time(NULL);
223 sblock->fs_id[1] = random();
225 if (lseek(devfd, sblockloc, SEEK_SET) == -1) {
226 warn("can't seek to superblock (%qd) on %s", sblockloc,
230 if ((n = write(devfd, (void *)sblock, SBLOCKSIZE)) !=
232 warn("can't write superblock on %s: %s", device,
233 (n < SBLOCKSIZE) ? "short write" : strerror(errno));
238 /* For each cylinder group, randomize inodes and update backup sblock */
239 for (cg = 0, inumber = 0; cg < sblock->fs_ncg; cg++) {
240 /* Update superblock if appropriate */
242 dblk = fsbtodb(sblock, cgsblock(sblock, cg));
243 if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) {
244 warn("can't seek to %qd", (off_t)dblk * bsize);
246 } else if ((n = write(devfd, (void *)sblock,
247 SBLOCKSIZE)) != SBLOCKSIZE) {
248 warn("can't write backup superblock %d on %s: %s",
249 cg + 1, device, (n < SBLOCKSIZE) ?
250 "short write" : strerror(errno));
255 /* Read in inodes, then print or randomize generation nums */
256 dblk = fsbtodb(sblock, ino_to_fsba(sblock, inumber));
257 if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) {
258 warn("can't seek to %qd", (off_t)dblk * bsize);
260 } else if ((n = read(devfd, inodebuf, ibufsize)) != ibufsize) {
261 warnx("can't read inodes: %s",
262 (n < ibufsize) ? "short read" : strerror(errno));
266 for (n = 0; n < sblock->fs_ipg; n++, inumber++) {
267 if (sblock->fs_magic == FS_UFS1_MAGIC)
268 dp1 = &((struct ufs1_dinode *)inodebuf)[n];
270 dp2 = &((struct ufs2_dinode *)inodebuf)[n];
271 if (inumber >= ROOTINO) {
273 (void)printf("ino %d gen %qx\n",
275 sblock->fs_magic == FS_UFS1_MAGIC ?
276 (quad_t)dp1->di_gen : dp2->di_gen);
277 else if (sblock->fs_magic == FS_UFS1_MAGIC)
278 dp1->di_gen = random();
280 dp2->di_gen = random();
284 /* Write out modified inodes */
286 if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) {
287 warn("can't seek to %qd",
288 (off_t)dblk * bsize);
290 } else if ((n = write(devfd, inodebuf, ibufsize)) !=
292 warnx("can't write inodes: %s",
293 (n != ibufsize) ? "short write" :
307 (void)fprintf(stderr,
308 "usage: fsirand [-b] [-f] [-p] special [special ...]\n");