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1 /*      $OpenBSD: fsirand.c,v 1.9 1997/02/28 00:46:33 millert Exp $     */
2
3 /*
4  * Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com>
5  * All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
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.
20  *
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.
31  */
32
33 #ifndef lint
34 static const char rcsid[] =
35   "$FreeBSD$";
36 #endif /* not lint */
37
38 #include <sys/param.h>
39 #include <sys/disklabel.h>
40 #include <sys/resource.h>
41
42 #include <ufs/ufs/dinode.h>
43 #include <ufs/ffs/fs.h>
44
45 #include <err.h>
46 #include <errno.h>
47 #include <fcntl.h>
48 #include <stdio.h>
49 #include <stdint.h>
50 #include <stdlib.h>
51 #include <string.h>
52 #include <time.h>
53 #include <unistd.h>
54
55 static void usage(void) __dead2;
56 int fsirand(char *);
57
58 /*
59  * Possible superblock locations ordered from most to least likely.
60  */
61 static int sblock_try[] = SBLOCKSEARCH;
62
63 int printonly = 0, force = 0, ignorelabel = 0;
64
65 int
66 main(int argc, char *argv[])
67 {
68         int n, ex = 0;
69         struct rlimit rl;
70
71         while ((n = getopt(argc, argv, "bfp")) != -1) {
72                 switch (n) {
73                 case 'b':
74                         ignorelabel++;
75                         break;
76                 case 'p':
77                         printonly++;
78                         break;
79                 case 'f':
80                         force++;
81                         break;
82                 default:
83                         usage();
84                 }
85         }
86         if (argc - optind < 1)
87                 usage();
88
89         srandomdev();
90
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");
96         } else
97                 warn("can't get resource limit for data size");
98
99         for (n = optind; n < argc; n++) {
100                 if (argc - optind != 1)
101                         (void)puts(argv[n]);
102                 ex += fsirand(argv[n]);
103                 if (n < argc - 1)
104                         putchar('\n');
105         }
106
107         exit(ex);
108 }
109
110 int
111 fsirand(char *device)
112 {
113         struct ufs1_dinode *dp1;
114         struct ufs2_dinode *dp2;
115         caddr_t inodebuf;
116         ssize_t ibufsize;
117         struct fs *sblock;
118         ino_t inumber;
119         ufs2_daddr_t sblockloc, dblk;
120         char sbuf[SBLOCKSIZE], sbuftmp[SBLOCKSIZE];
121         int i, devfd, n, cg;
122         u_int32_t bsize = DEV_BSIZE;
123         struct disklabel label;
124
125         if ((devfd = open(device, printonly ? O_RDONLY : O_RDWR)) < 0) {
126                 warn("can't open %s", device);
127                 return (1);
128         }
129
130         /* Get block size (usually 512) from disklabel if possible */
131         if (!ignorelabel) {
132                 if (ioctl(devfd, DIOCGDINFO, &label) < 0)
133                         warn("can't read disklabel, using sector size of %d",
134                             bsize);
135                 else
136                         bsize = label.d_secsize;
137         }
138
139         dp1 = NULL;
140         dp2 = NULL;
141
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);
150                         return (1);
151                 }
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));
155                         return (1);
156                 }
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))
162                         break;
163         }
164         if (sblock_try[i] == -1) {
165                 fprintf(stderr, "Cannot find file system superblock\n");
166                 return (1);
167         }
168
169         if (sblock->fs_magic == FS_UFS1_MAGIC &&
170             sblock->fs_old_inodefmt < FS_44INODEFMT) {
171                 warnx("file system format is too old, sorry");
172                 return (1);
173         }
174         if (!force && !printonly && sblock->fs_clean != 1) {
175                 warnx("file system is not clean, fsck %s first", device);
176                 return (1);
177         }
178
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);
185                         return (1);
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"
189                             : strerror(errno));
190                         return (1);
191                 }
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",
195                             cg + 1, device);
196                         return (1);
197                 }
198                 if (sblock->fs_sbsize > SBLOCKSIZE) {
199                         warnx("size of backup superblock %d on %s is preposterous",
200                             cg + 1, device);
201                         return (1);
202                 }
203         }
204         sblock = (struct fs *)&sbuf;
205
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;
209         else
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");
213
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],
219                             sblock->fs_id[1]);
220         }
221
222         /* Randomize fs_id unless old 4.2BSD file system */
223         if (!printonly) {
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();
227
228                 if (lseek(devfd, sblockloc, SEEK_SET) == -1) {
229                         warn("can't seek to superblock (%jd) on %s",
230                             (intmax_t)sblockloc, device);
231                         return (1);
232                 }
233                 if ((n = write(devfd, (void *)sblock, SBLOCKSIZE)) !=
234                     SBLOCKSIZE) {
235                         warn("can't write superblock on %s: %s", device,
236                             (n < SBLOCKSIZE) ? "short write" : strerror(errno));
237                         return (1);
238                 }
239         }
240
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 */
244                 if (!printonly) {
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);
249                                 return (1);
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));
255                                 return (1);
256                         }
257                 }
258
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);
263                         return (1);
264                 } else if ((n = read(devfd, inodebuf, ibufsize)) != ibufsize) {
265                         warnx("can't read inodes: %s",
266                              (n < ibufsize) ? "short read" : strerror(errno));
267                         return (1);
268                 }
269
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];
273                         else
274                                 dp2 = &((struct ufs2_dinode *)inodebuf)[n];
275                         if (inumber >= ROOTINO) {
276                                 if (printonly)
277                                         (void)printf("ino %d gen %08x\n",
278                                             inumber,
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(); 
283                                 else
284                                         dp2->di_gen = random();
285                         }
286                 }
287
288                 /* Write out modified inodes */
289                 if (!printonly) {
290                         if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) {
291                                 warn("can't seek to %jd",
292                                     (intmax_t)dblk * bsize);
293                                 return (1);
294                         } else if ((n = write(devfd, inodebuf, ibufsize)) !=
295                                  ibufsize) {
296                                 warnx("can't write inodes: %s",
297                                      (n != ibufsize) ? "short write" :
298                                      strerror(errno));
299                                 return (1);
300                         }
301                 }
302         }
303         (void)close(devfd);
304
305         return(0);
306 }
307
308 static void
309 usage(void)
310 {
311         (void)fprintf(stderr, 
312                 "usage: fsirand [-b] [-f] [-p] special [special ...]\n");
313         exit(1);
314 }