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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/resource.h>
40
41 #include <ufs/ufs/dinode.h>
42 #include <ufs/ffs/fs.h>
43
44 #include <err.h>
45 #include <errno.h>
46 #include <fcntl.h>
47 #include <stdio.h>
48 #include <stdint.h>
49 #include <stdlib.h>
50 #include <string.h>
51 #include <time.h>
52 #include <unistd.h>
53
54 static void usage(void) __dead2;
55 int fsirand(char *);
56
57 /*
58  * Possible superblock locations ordered from most to least likely.
59  */
60 static int sblock_try[] = SBLOCKSEARCH;
61
62 static int printonly = 0, force = 0, ignorelabel = 0;
63
64 int
65 main(int argc, char *argv[])
66 {
67         int n, ex = 0;
68         struct rlimit rl;
69
70         while ((n = getopt(argc, argv, "bfp")) != -1) {
71                 switch (n) {
72                 case 'b':
73                         ignorelabel++;
74                         break;
75                 case 'p':
76                         printonly++;
77                         break;
78                 case 'f':
79                         force++;
80                         break;
81                 default:
82                         usage();
83                 }
84         }
85         if (argc - optind < 1)
86                 usage();
87
88         srandomdev();
89
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");
95         } else
96                 warn("can't get resource limit for data size");
97
98         for (n = optind; n < argc; n++) {
99                 if (argc - optind != 1)
100                         (void)puts(argv[n]);
101                 ex += fsirand(argv[n]);
102                 if (n < argc - 1)
103                         putchar('\n');
104         }
105
106         exit(ex);
107 }
108
109 int
110 fsirand(char *device)
111 {
112         struct ufs1_dinode *dp1;
113         struct ufs2_dinode *dp2;
114         caddr_t inodebuf;
115         ssize_t ibufsize;
116         struct fs *sblock;
117         ino_t inumber;
118         ufs2_daddr_t sblockloc, dblk;
119         char sbuf[SBLOCKSIZE], sbuftmp[SBLOCKSIZE];
120         int i, devfd, n, cg;
121         u_int32_t bsize = DEV_BSIZE;
122
123         if ((devfd = open(device, printonly ? O_RDONLY : O_RDWR)) < 0) {
124                 warn("can't open %s", device);
125                 return (1);
126         }
127
128         dp1 = NULL;
129         dp2 = NULL;
130
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);
139                         return (1);
140                 }
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));
144                         return (1);
145                 }
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))
151                         break;
152         }
153         if (sblock_try[i] == -1) {
154                 fprintf(stderr, "Cannot find file system superblock\n");
155                 return (1);
156         }
157
158         if (sblock->fs_magic == FS_UFS1_MAGIC &&
159             sblock->fs_old_inodefmt < FS_44INODEFMT) {
160                 warnx("file system format is too old, sorry");
161                 return (1);
162         }
163         if (!force && !printonly && sblock->fs_clean != 1) {
164                 warnx("file system is not clean, fsck %s first", device);
165                 return (1);
166         }
167
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);
174                         return (1);
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"
178                             : strerror(errno));
179                         return (1);
180                 }
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",
184                             cg + 1, device);
185                         return (1);
186                 }
187                 if (sblock->fs_sbsize > SBLOCKSIZE) {
188                         warnx("size of backup superblock %d on %s is preposterous",
189                             cg + 1, device);
190                         return (1);
191                 }
192         }
193         sblock = (struct fs *)&sbuf;
194
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;
198         else
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");
202
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],
208                             sblock->fs_id[1]);
209         }
210
211         /* Randomize fs_id unless old 4.2BSD file system */
212         if (!printonly) {
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();
216
217                 if (lseek(devfd, sblockloc, SEEK_SET) == -1) {
218                         warn("can't seek to superblock (%jd) on %s",
219                             (intmax_t)sblockloc, device);
220                         return (1);
221                 }
222                 if ((n = write(devfd, (void *)sblock, SBLOCKSIZE)) !=
223                     SBLOCKSIZE) {
224                         warn("can't write superblock on %s: %s", device,
225                             (n < SBLOCKSIZE) ? "short write" : strerror(errno));
226                         return (1);
227                 }
228         }
229
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 */
233                 if (!printonly) {
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);
238                                 return (1);
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));
244                                 return (1);
245                         }
246                 }
247
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);
252                         return (1);
253                 } else if ((n = read(devfd, inodebuf, ibufsize)) != ibufsize) {
254                         warnx("can't read inodes: %s",
255                              (n < ibufsize) ? "short read" : strerror(errno));
256                         return (1);
257                 }
258
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];
262                         else
263                                 dp2 = &((struct ufs2_dinode *)inodebuf)[n];
264                         if (inumber >= ROOTINO) {
265                                 if (printonly)
266                                         (void)printf("ino %ju gen %08x\n",
267                                             (uintmax_t)inumber,
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(); 
272                                 else
273                                         dp2->di_gen = random();
274                         }
275                 }
276
277                 /* Write out modified inodes */
278                 if (!printonly) {
279                         if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) {
280                                 warn("can't seek to %jd",
281                                     (intmax_t)dblk * bsize);
282                                 return (1);
283                         } else if ((n = write(devfd, inodebuf, ibufsize)) !=
284                                  ibufsize) {
285                                 warnx("can't write inodes: %s",
286                                      (n != ibufsize) ? "short write" :
287                                      strerror(errno));
288                                 return (1);
289                         }
290                 }
291         }
292         (void)close(devfd);
293
294         return(0);
295 }
296
297 static void
298 usage(void)
299 {
300         (void)fprintf(stderr, 
301                 "usage: fsirand [-b] [-f] [-p] special [special ...]\n");
302         exit(1);
303 }