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/resource.h>
41 #include <ufs/ufs/dinode.h>
42 #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 static 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;
118 ufs2_daddr_t sblockloc, dblk;
119 char sbuf[SBLOCKSIZE], sbuftmp[SBLOCKSIZE];
121 u_int32_t bsize = DEV_BSIZE;
123 if ((devfd = open(device, printonly ? O_RDONLY : O_RDWR)) < 0) {
124 warn("can't open %s", device);
131 /* Read in master superblock */
132 (void)memset(&sbuf, 0, sizeof(sbuf));
133 sblock = (struct fs *)&sbuf;
134 for (i = 0; sblock_try[i] != -1; i++) {
135 sblockloc = sblock_try[i];
136 if (lseek(devfd, sblockloc, SEEK_SET) == -1) {
137 warn("can't seek to superblock (%jd) on %s",
138 (intmax_t)sblockloc, device);
141 if ((n = read(devfd, (void *)sblock, SBLOCKSIZE))!=SBLOCKSIZE) {
142 warnx("can't read superblock on %s: %s", device,
143 (n < SBLOCKSIZE) ? "short read" : strerror(errno));
146 if ((sblock->fs_magic == FS_UFS1_MAGIC ||
147 (sblock->fs_magic == FS_UFS2_MAGIC &&
148 sblock->fs_sblockloc == sblock_try[i])) &&
149 sblock->fs_bsize <= MAXBSIZE &&
150 sblock->fs_bsize >= (ssize_t)sizeof(struct fs))
153 if (sblock_try[i] == -1) {
154 fprintf(stderr, "Cannot find file system superblock\n");
158 if (sblock->fs_magic == FS_UFS1_MAGIC &&
159 sblock->fs_old_inodefmt < FS_44INODEFMT) {
160 warnx("file system format is too old, sorry");
163 if (!force && !printonly && sblock->fs_clean != 1) {
164 warnx("file system is not clean, fsck %s first", device);
168 /* Make sure backup superblocks are sane. */
169 sblock = (struct fs *)&sbuftmp;
170 for (cg = 0; cg < (int)sblock->fs_ncg; cg++) {
171 dblk = fsbtodb(sblock, cgsblock(sblock, cg));
172 if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) {
173 warn("can't seek to %jd", (intmax_t)dblk * bsize);
175 } else if ((n = write(devfd, (void *)sblock, SBLOCKSIZE)) != SBLOCKSIZE) {
176 warn("can't read backup superblock %d on %s: %s",
177 cg + 1, device, (n < SBLOCKSIZE) ? "short write"
181 if (sblock->fs_magic != FS_UFS1_MAGIC &&
182 sblock->fs_magic != FS_UFS2_MAGIC) {
183 warnx("bad magic number in backup superblock %d on %s",
187 if (sblock->fs_sbsize > SBLOCKSIZE) {
188 warnx("size of backup superblock %d on %s is preposterous",
193 sblock = (struct fs *)&sbuf;
195 /* XXX - should really cap buffer at 512kb or so */
196 if (sblock->fs_magic == FS_UFS1_MAGIC)
197 ibufsize = sizeof(struct ufs1_dinode) * sblock->fs_ipg;
199 ibufsize = sizeof(struct ufs2_dinode) * sblock->fs_ipg;
200 if ((inodebuf = malloc(ibufsize)) == NULL)
201 errx(1, "can't allocate memory for inode buffer");
203 if (printonly && (sblock->fs_id[0] || sblock->fs_id[1])) {
204 if (sblock->fs_id[0])
205 (void)printf("%s was randomized on %s", device,
206 ctime((void *)&(sblock->fs_id[0])));
207 (void)printf("fsid: %x %x\n", sblock->fs_id[0],
211 /* Randomize fs_id unless old 4.2BSD file system */
213 /* Randomize fs_id and write out new sblock and backups */
214 sblock->fs_id[0] = (u_int32_t)time(NULL);
215 sblock->fs_id[1] = random();
217 if (lseek(devfd, sblockloc, SEEK_SET) == -1) {
218 warn("can't seek to superblock (%jd) on %s",
219 (intmax_t)sblockloc, device);
222 if ((n = write(devfd, (void *)sblock, SBLOCKSIZE)) !=
224 warn("can't write superblock on %s: %s", device,
225 (n < SBLOCKSIZE) ? "short write" : strerror(errno));
230 /* For each cylinder group, randomize inodes and update backup sblock */
231 for (cg = 0, inumber = 0; cg < (int)sblock->fs_ncg; cg++) {
232 /* Update superblock if appropriate */
234 dblk = fsbtodb(sblock, cgsblock(sblock, cg));
235 if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) {
236 warn("can't seek to %jd",
237 (intmax_t)dblk * bsize);
239 } else if ((n = write(devfd, (void *)sblock,
240 SBLOCKSIZE)) != SBLOCKSIZE) {
241 warn("can't write backup superblock %d on %s: %s",
242 cg + 1, device, (n < SBLOCKSIZE) ?
243 "short write" : strerror(errno));
248 /* Read in inodes, then print or randomize generation nums */
249 dblk = fsbtodb(sblock, ino_to_fsba(sblock, inumber));
250 if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) {
251 warn("can't seek to %jd", (intmax_t)dblk * bsize);
253 } else if ((n = read(devfd, inodebuf, ibufsize)) != ibufsize) {
254 warnx("can't read inodes: %s",
255 (n < ibufsize) ? "short read" : strerror(errno));
259 for (n = 0; n < (int)sblock->fs_ipg; n++, inumber++) {
260 if (sblock->fs_magic == FS_UFS1_MAGIC)
261 dp1 = &((struct ufs1_dinode *)inodebuf)[n];
263 dp2 = &((struct ufs2_dinode *)inodebuf)[n];
264 if (inumber >= ROOTINO) {
266 (void)printf("ino %ju gen %08x\n",
268 sblock->fs_magic == FS_UFS1_MAGIC ?
269 dp1->di_gen : dp2->di_gen);
270 else if (sblock->fs_magic == FS_UFS1_MAGIC)
271 dp1->di_gen = random();
273 dp2->di_gen = random();
277 /* Write out modified inodes */
279 if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) {
280 warn("can't seek to %jd",
281 (intmax_t)dblk * bsize);
283 } else if ((n = write(devfd, inodebuf, ibufsize)) !=
285 warnx("can't write inodes: %s",
286 (n != ibufsize) ? "short write" :
300 (void)fprintf(stderr,
301 "usage: fsirand [-b] [-f] [-p] special [special ...]\n");