aboutsummaryrefslogtreecommitdiff
path: root/sbin/fsirand/fsirand.c
blob: ca7841a46f3e9b0d08b6dcdaa8b64cb28333eccc (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
/*	$OpenBSD: fsirand.c,v 1.9 1997/02/28 00:46:33 millert Exp $	*/

/*
 * Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by Todd C. Miller.
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef lint
static const char rcsid[] =
  "$FreeBSD$";
#endif /* not lint */

#include <sys/param.h>
#include <sys/disklabel.h>
#include <sys/resource.h>

#include <ufs/ufs/dinode.h>
#include <ufs/ffs/fs.h>

#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>

static void usage(void) __dead2;
int fsirand(char *);

/*
 * Possible superblock locations ordered from most to least likely.
 */
static int sblock_try[] = SBLOCKSEARCH;

static int printonly = 0, force = 0, ignorelabel = 0;

int
main(int argc, char *argv[])
{
	int n, ex = 0;
	struct rlimit rl;

	while ((n = getopt(argc, argv, "bfp")) != -1) {
		switch (n) {
		case 'b':
			ignorelabel++;
			break;
		case 'p':
			printonly++;
			break;
		case 'f':
			force++;
			break;
		default:
			usage();
		}
	}
	if (argc - optind < 1)
		usage();

	srandomdev();

	/* Increase our data size to the max */
	if (getrlimit(RLIMIT_DATA, &rl) == 0) {
		rl.rlim_cur = rl.rlim_max;
		if (setrlimit(RLIMIT_DATA, &rl) < 0)
			warn("can't get resource limit to max data size");
	} else
		warn("can't get resource limit for data size");

	for (n = optind; n < argc; n++) {
		if (argc - optind != 1)
			(void)puts(argv[n]);
		ex += fsirand(argv[n]);
		if (n < argc - 1)
			putchar('\n');
	}

	exit(ex);
}

int
fsirand(char *device)
{
	struct ufs1_dinode *dp1;
	struct ufs2_dinode *dp2;
	caddr_t inodebuf;
	ssize_t ibufsize;
	struct fs *sblock;
	ino_t inumber;
	ufs2_daddr_t sblockloc, dblk;
	char sbuf[SBLOCKSIZE], sbuftmp[SBLOCKSIZE];
	int i, devfd, n, cg;
	u_int32_t bsize = DEV_BSIZE;
	struct disklabel label;

	if ((devfd = open(device, printonly ? O_RDONLY : O_RDWR)) < 0) {
		warn("can't open %s", device);
		return (1);
	}

	/* Get block size (usually 512) from disklabel if possible */
	if (!ignorelabel) {
		if (ioctl(devfd, DIOCGDINFO, &label) < 0)
			warn("can't read disklabel, using sector size of %d",
			    bsize);
		else
			bsize = label.d_secsize;
	}

	dp1 = NULL;
	dp2 = NULL;

	/* Read in master superblock */
	(void)memset(&sbuf, 0, sizeof(sbuf));
	sblock = (struct fs *)&sbuf;
	for (i = 0; sblock_try[i] != -1; i++) {
		sblockloc = sblock_try[i];
		if (lseek(devfd, sblockloc, SEEK_SET) == -1) {
			warn("can't seek to superblock (%jd) on %s",
			    (intmax_t)sblockloc, device);
			return (1);
		}
		if ((n = read(devfd, (void *)sblock, SBLOCKSIZE))!=SBLOCKSIZE) {
			warnx("can't read superblock on %s: %s", device,
			    (n < SBLOCKSIZE) ? "short read" : strerror(errno));
			return (1);
		}
		if ((sblock->fs_magic == FS_UFS1_MAGIC ||
		     (sblock->fs_magic == FS_UFS2_MAGIC &&
		      sblock->fs_sblockloc == sblock_try[i])) &&
		    sblock->fs_bsize <= MAXBSIZE &&
		    sblock->fs_bsize >= (ssize_t)sizeof(struct fs))
			break;
	}
	if (sblock_try[i] == -1) {
		fprintf(stderr, "Cannot find file system superblock\n");
		return (1);
	}

	if (sblock->fs_magic == FS_UFS1_MAGIC &&
	    sblock->fs_old_inodefmt < FS_44INODEFMT) {
		warnx("file system format is too old, sorry");
		return (1);
	}
	if (!force && !printonly && sblock->fs_clean != 1) {
		warnx("file system is not clean, fsck %s first", device);
		return (1);
	}

	/* Make sure backup superblocks are sane. */
	sblock = (struct fs *)&sbuftmp;
	for (cg = 0; cg < (int)sblock->fs_ncg; cg++) {
		dblk = fsbtodb(sblock, cgsblock(sblock, cg));
		if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) {
			warn("can't seek to %jd", (intmax_t)dblk * bsize);
			return (1);
		} else if ((n = write(devfd, (void *)sblock, SBLOCKSIZE)) != SBLOCKSIZE) {
			warn("can't read backup superblock %d on %s: %s",
			    cg + 1, device, (n < SBLOCKSIZE) ? "short write"
			    : strerror(errno));
			return (1);
		}
		if (sblock->fs_magic != FS_UFS1_MAGIC &&
		    sblock->fs_magic != FS_UFS2_MAGIC) {
			warnx("bad magic number in backup superblock %d on %s",
			    cg + 1, device);
			return (1);
		}
		if (sblock->fs_sbsize > SBLOCKSIZE) {
			warnx("size of backup superblock %d on %s is preposterous",
			    cg + 1, device);
			return (1);
		}
	}
	sblock = (struct fs *)&sbuf;

	/* XXX - should really cap buffer at 512kb or so */
	if (sblock->fs_magic == FS_UFS1_MAGIC)
		ibufsize = sizeof(struct ufs1_dinode) * sblock->fs_ipg;
	else
		ibufsize = sizeof(struct ufs2_dinode) * sblock->fs_ipg;
	if ((inodebuf = malloc(ibufsize)) == NULL)
		errx(1, "can't allocate memory for inode buffer");

	if (printonly && (sblock->fs_id[0] || sblock->fs_id[1])) {
		if (sblock->fs_id[0])
			(void)printf("%s was randomized on %s", device,
			    ctime((void *)&(sblock->fs_id[0])));
		(void)printf("fsid: %x %x\n", sblock->fs_id[0],
			    sblock->fs_id[1]);
	}

	/* Randomize fs_id unless old 4.2BSD file system */
	if (!printonly) {
		/* Randomize fs_id and write out new sblock and backups */
		sblock->fs_id[0] = (u_int32_t)time(NULL);
		sblock->fs_id[1] = random();

		if (lseek(devfd, sblockloc, SEEK_SET) == -1) {
			warn("can't seek to superblock (%jd) on %s",
			    (intmax_t)sblockloc, device);
			return (1);
		}
		if ((n = write(devfd, (void *)sblock, SBLOCKSIZE)) !=
		    SBLOCKSIZE) {
			warn("can't write superblock on %s: %s", device,
			    (n < SBLOCKSIZE) ? "short write" : strerror(errno));
			return (1);
		}
	}

	/* For each cylinder group, randomize inodes and update backup sblock */
	for (cg = 0, inumber = 0; cg < (int)sblock->fs_ncg; cg++) {
		/* Update superblock if appropriate */
		if (!printonly) {
			dblk = fsbtodb(sblock, cgsblock(sblock, cg));
			if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) {
				warn("can't seek to %jd",
				    (intmax_t)dblk * bsize);
				return (1);
			} else if ((n = write(devfd, (void *)sblock,
			    SBLOCKSIZE)) != SBLOCKSIZE) {
			      warn("can't write backup superblock %d on %s: %s",
				    cg + 1, device, (n < SBLOCKSIZE) ?
				    "short write" : strerror(errno));
				return (1);
			}
		}

		/* Read in inodes, then print or randomize generation nums */
		dblk = fsbtodb(sblock, ino_to_fsba(sblock, inumber));
		if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) {
			warn("can't seek to %jd", (intmax_t)dblk * bsize);
			return (1);
		} else if ((n = read(devfd, inodebuf, ibufsize)) != ibufsize) {
			warnx("can't read inodes: %s",
			     (n < ibufsize) ? "short read" : strerror(errno));
			return (1);
		}

		for (n = 0; n < (int)sblock->fs_ipg; n++, inumber++) {
			if (sblock->fs_magic == FS_UFS1_MAGIC)
				dp1 = &((struct ufs1_dinode *)inodebuf)[n];
			else
				dp2 = &((struct ufs2_dinode *)inodebuf)[n];
			if (inumber >= ROOTINO) {
				if (printonly)
					(void)printf("ino %d gen %08x\n",
					    inumber,
					    sblock->fs_magic == FS_UFS1_MAGIC ?
					    dp1->di_gen : dp2->di_gen);
				else if (sblock->fs_magic == FS_UFS1_MAGIC) 
					dp1->di_gen = random(); 
				else
					dp2->di_gen = random();
			}
		}

		/* Write out modified inodes */
		if (!printonly) {
			if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) {
				warn("can't seek to %jd",
				    (intmax_t)dblk * bsize);
				return (1);
			} else if ((n = write(devfd, inodebuf, ibufsize)) !=
				 ibufsize) {
				warnx("can't write inodes: %s",
				     (n != ibufsize) ? "short write" :
				     strerror(errno));
				return (1);
			}
		}
	}
	(void)close(devfd);

	return(0);
}

static void
usage(void)
{
	(void)fprintf(stderr, 
		"usage: fsirand [-b] [-f] [-p] special [special ...]\n");
	exit(1);
}