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/param.h>
39 #include <sys/disklabel.h>
40 #include <sys/resource.h>
42 #include <ufs/ufs/dinode.h>
43 #include <ufs/ffs/fs.h>
55 static void usage(void) __dead2;
59 * Possible superblock locations ordered from most to least likely.
61 static int sblock_try[] = SBLOCKSEARCH;
63 int printonly = 0, force = 0, ignorelabel = 0;
66 main(int argc, char *argv[])
71 while ((n = getopt(argc, argv, "bfp")) != -1) {
86 if (argc - optind < 1)
91 /* Increase our data size to the max */
92 if (getrlimit(RLIMIT_DATA, &rl) == 0) {
93 rl.rlim_cur = rl.rlim_max;
94 if (setrlimit(RLIMIT_DATA, &rl) < 0)
95 warn("can't get resource limit to max data size");
97 warn("can't get resource limit for data size");
99 for (n = optind; n < argc; n++) {
100 if (argc - optind != 1)
102 ex += fsirand(argv[n]);
111 fsirand(char *device)
113 struct ufs1_dinode *dp1;
114 struct ufs2_dinode *dp2;
119 ufs2_daddr_t sblockloc, dblk;
120 char sbuf[SBLOCKSIZE], sbuftmp[SBLOCKSIZE];
122 u_int32_t bsize = DEV_BSIZE;
123 struct disklabel label;
125 if ((devfd = open(device, printonly ? O_RDONLY : O_RDWR)) < 0) {
126 warn("can't open %s", device);
130 /* Get block size (usually 512) from disklabel if possible */
132 if (ioctl(devfd, DIOCGDINFO, &label) < 0)
133 warn("can't read disklabel, using sector size of %d",
136 bsize = label.d_secsize;
142 /* Read in master superblock */
143 (void)memset(&sbuf, 0, sizeof(sbuf));
144 sblock = (struct fs *)&sbuf;
145 for (i = 0; sblock_try[i] != -1; i++) {
146 sblockloc = sblock_try[i];
147 if (lseek(devfd, sblockloc, SEEK_SET) == -1) {
148 warn("can't seek to superblock (%jd) on %s",
149 (intmax_t)sblockloc, device);
152 if ((n = read(devfd, (void *)sblock, SBLOCKSIZE))!=SBLOCKSIZE) {
153 warnx("can't read superblock on %s: %s", device,
154 (n < SBLOCKSIZE) ? "short read" : strerror(errno));
157 if ((sblock->fs_magic == FS_UFS1_MAGIC ||
158 (sblock->fs_magic == FS_UFS2_MAGIC &&
159 sblock->fs_sblockloc == sblock_try[i])) &&
160 sblock->fs_bsize <= MAXBSIZE &&
161 sblock->fs_bsize >= (ssize_t)sizeof(struct fs))
164 if (sblock_try[i] == -1) {
165 fprintf(stderr, "Cannot find file system superblock\n");
169 if (sblock->fs_magic == FS_UFS1_MAGIC &&
170 sblock->fs_old_inodefmt < FS_44INODEFMT) {
171 warnx("file system format is too old, sorry");
174 if (!force && !printonly && sblock->fs_clean != 1) {
175 warnx("file system is not clean, fsck %s first", device);
179 /* Make sure backup superblocks are sane. */
180 sblock = (struct fs *)&sbuftmp;
181 for (cg = 0; cg < (int)sblock->fs_ncg; cg++) {
182 dblk = fsbtodb(sblock, cgsblock(sblock, cg));
183 if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) {
184 warn("can't seek to %jd", (intmax_t)dblk * bsize);
186 } else if ((n = write(devfd, (void *)sblock, SBLOCKSIZE)) != SBLOCKSIZE) {
187 warn("can't read backup superblock %d on %s: %s",
188 cg + 1, device, (n < SBLOCKSIZE) ? "short write"
192 if (sblock->fs_magic != FS_UFS1_MAGIC &&
193 sblock->fs_magic != FS_UFS2_MAGIC) {
194 warnx("bad magic number in backup superblock %d on %s",
198 if (sblock->fs_sbsize > SBLOCKSIZE) {
199 warnx("size of backup superblock %d on %s is preposterous",
204 sblock = (struct fs *)&sbuf;
206 /* XXX - should really cap buffer at 512kb or so */
207 if (sblock->fs_magic == FS_UFS1_MAGIC)
208 ibufsize = sizeof(struct ufs1_dinode) * sblock->fs_ipg;
210 ibufsize = sizeof(struct ufs2_dinode) * sblock->fs_ipg;
211 if ((inodebuf = malloc(ibufsize)) == NULL)
212 errx(1, "can't allocate memory for inode buffer");
214 if (printonly && (sblock->fs_id[0] || sblock->fs_id[1])) {
215 if (sblock->fs_id[0])
216 (void)printf("%s was randomized on %s", device,
217 ctime((void *)&(sblock->fs_id[0])));
218 (void)printf("fsid: %x %x\n", sblock->fs_id[0],
222 /* Randomize fs_id unless old 4.2BSD file system */
224 /* Randomize fs_id and write out new sblock and backups */
225 sblock->fs_id[0] = (u_int32_t)time(NULL);
226 sblock->fs_id[1] = random();
228 if (lseek(devfd, sblockloc, SEEK_SET) == -1) {
229 warn("can't seek to superblock (%jd) on %s",
230 (intmax_t)sblockloc, device);
233 if ((n = write(devfd, (void *)sblock, SBLOCKSIZE)) !=
235 warn("can't write superblock on %s: %s", device,
236 (n < SBLOCKSIZE) ? "short write" : strerror(errno));
241 /* For each cylinder group, randomize inodes and update backup sblock */
242 for (cg = 0, inumber = 0; cg < (int)sblock->fs_ncg; cg++) {
243 /* Update superblock if appropriate */
245 dblk = fsbtodb(sblock, cgsblock(sblock, cg));
246 if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) {
247 warn("can't seek to %jd",
248 (intmax_t)dblk * bsize);
250 } else if ((n = write(devfd, (void *)sblock,
251 SBLOCKSIZE)) != SBLOCKSIZE) {
252 warn("can't write backup superblock %d on %s: %s",
253 cg + 1, device, (n < SBLOCKSIZE) ?
254 "short write" : strerror(errno));
259 /* Read in inodes, then print or randomize generation nums */
260 dblk = fsbtodb(sblock, ino_to_fsba(sblock, inumber));
261 if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) {
262 warn("can't seek to %jd", (intmax_t)dblk * bsize);
264 } else if ((n = read(devfd, inodebuf, ibufsize)) != ibufsize) {
265 warnx("can't read inodes: %s",
266 (n < ibufsize) ? "short read" : strerror(errno));
270 for (n = 0; n < (int)sblock->fs_ipg; n++, inumber++) {
271 if (sblock->fs_magic == FS_UFS1_MAGIC)
272 dp1 = &((struct ufs1_dinode *)inodebuf)[n];
274 dp2 = &((struct ufs2_dinode *)inodebuf)[n];
275 if (inumber >= ROOTINO) {
277 (void)printf("ino %d gen %08x\n",
279 sblock->fs_magic == FS_UFS1_MAGIC ?
280 dp1->di_gen : dp2->di_gen);
281 else if (sblock->fs_magic == FS_UFS1_MAGIC)
282 dp1->di_gen = random();
284 dp2->di_gen = random();
288 /* Write out modified inodes */
290 if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) {
291 warn("can't seek to %jd",
292 (intmax_t)dblk * bsize);
294 } else if ((n = write(devfd, inodebuf, ibufsize)) !=
296 warnx("can't write inodes: %s",
297 (n != ibufsize) ? "short write" :
311 (void)fprintf(stderr,
312 "usage: fsirand [-b] [-f] [-p] special [special ...]\n");