fsirand.c revision 92881 
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
34static const char rcsid[] =
35  "$FreeBSD: head/sbin/fsirand/fsirand.c 92881 2002-03-21 13:10:52Z imp $";
36#endif /* not lint */
37
38#include <sys/disklabel.h>
39#include <sys/param.h>
40#include <sys/time.h>
41#include <sys/resource.h>
42
43#include <ufs/ffs/fs.h>
44#include <ufs/ufs/dinode.h>
45
46#include <err.h>
47#include <errno.h>
48#include <fcntl.h>
49#include <stdio.h>
50#include <stdlib.h>
51#include <string.h>
52#include <unistd.h>
53
54static void usage(void) __dead2;
55int fsirand(char *);
56
57int printonly = 0, force = 0, ignorelabel = 0;
58
59int
60main(int argc, char *argv[])
61{
62	int n, ex = 0;
63	struct rlimit rl;
64
65	while ((n = getopt(argc, argv, "bfp")) != -1) {
66		switch (n) {
67		case 'b':
68			ignorelabel++;
69			break;
70		case 'p':
71			printonly++;
72			break;
73		case 'f':
74			force++;
75			break;
76		default:
77			usage();
78		}
79	}
80	if (argc - optind < 1)
81		usage();
82
83	srandomdev();
84
85	/* Increase our data size to the max */
86	if (getrlimit(RLIMIT_DATA, &rl) == 0) {
87		rl.rlim_cur = rl.rlim_max;
88		if (setrlimit(RLIMIT_DATA, &rl) < 0)
89			warn("can't get resource limit to max data size");
90	} else
91		warn("can't get resource limit for data size");
92
93	for (n = optind; n < argc; n++) {
94		if (argc - optind != 1)
95			(void)puts(argv[n]);
96		ex += fsirand(argv[n]);
97		if (n < argc - 1)
98			putchar('\n');
99	}
100
101	exit(ex);
102}
103
104int
105fsirand(char *device)
106{
107	static struct dinode *inodebuf;
108	static size_t oldibufsize;
109	size_t ibufsize;
110	struct fs *sblock;
111	ino_t inumber, maxino;
112	daddr_t dblk;
113	char sbuf[SBSIZE], sbuftmp[SBSIZE];
114	int devfd, n, cg;
115	u_int32_t bsize = DEV_BSIZE;
116	struct disklabel label;
117
118	if ((devfd = open(device, printonly ? O_RDONLY : O_RDWR)) < 0) {
119		warn("can't open %s", device);
120		return (1);
121	}
122
123	/* Get block size (usually 512) from disklabel if possible */
124	if (!ignorelabel) {
125		if (ioctl(devfd, DIOCGDINFO, &label) < 0)
126			warn("can't read disklabel, using sector size of %d",
127			    bsize);
128		else
129			bsize = label.d_secsize;
130	}
131
132	/* Read in master superblock */
133	(void)memset(&sbuf, 0, sizeof(sbuf));
134	sblock = (struct fs *)&sbuf;
135	if (lseek(devfd, SBOFF, SEEK_SET) == -1) {
136		warn("can't seek to superblock (%qd) on %s", SBOFF, device);
137		return (1);
138	}
139	if ((n = read(devfd, (void *)sblock, SBSIZE)) != SBSIZE) {
140		warnx("can't read superblock on %s: %s", device,
141		    (n < SBSIZE) ? "short read" : strerror(errno));
142		return (1);
143	}
144	maxino = sblock->fs_ncg * sblock->fs_ipg;
145
146	/* Simple sanity checks on the superblock */
147	if (sblock->fs_magic != FS_MAGIC) {
148		warnx("bad magic number in superblock");
149		return (1);
150	}
151	if (sblock->fs_sbsize > SBSIZE) {
152		warnx("superblock size is preposterous");
153		return (1);
154	}
155	if (sblock->fs_postblformat == FS_42POSTBLFMT) {
156		warnx("filesystem format is too old, sorry");
157		return (1);
158	}
159	if (!force && !printonly && sblock->fs_clean != 1) {
160		warnx("filesystem is not clean, fsck %s first", device);
161		return (1);
162	}
163
164	/* Make sure backup superblocks are sane. */
165	sblock = (struct fs *)&sbuftmp;
166	for (cg = 0; cg < sblock->fs_ncg; cg++) {
167		dblk = fsbtodb(sblock, cgsblock(sblock, cg));
168		if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) {
169			warn("can't seek to %qd", (off_t)dblk * bsize);
170			return (1);
171		} else if ((n = write(devfd, (void *)sblock, SBSIZE)) != SBSIZE) {
172			warn("can't read backup superblock %d on %s: %s",
173			    cg + 1, device, (n < SBSIZE) ? "short write"
174			    : strerror(errno));
175			return (1);
176		}
177		if (sblock->fs_magic != FS_MAGIC) {
178			warnx("bad magic number in backup superblock %d on %s",
179			    cg + 1, device);
180			return (1);
181		}
182		if (sblock->fs_sbsize > SBSIZE) {
183			warnx("size of backup superblock %d on %s is preposterous",
184			    cg + 1, device);
185			return (1);
186		}
187	}
188	sblock = (struct fs *)&sbuf;
189
190	/* XXX - should really cap buffer at 512kb or so */
191	ibufsize = sizeof(struct dinode) * sblock->fs_ipg;
192	if (oldibufsize < ibufsize) {
193		if ((inodebuf = realloc(inodebuf, ibufsize)) == NULL)
194			errx(1, "can't allocate memory for inode buffer");
195		oldibufsize = ibufsize;
196	}
197
198	if (printonly && (sblock->fs_id[0] || sblock->fs_id[1])) {
199		if (sblock->fs_inodefmt >= FS_44INODEFMT && sblock->fs_id[0])
200			(void)printf("%s was randomized on %s", device,
201			    ctime((const time_t *)&(sblock->fs_id[0])));
202		(void)printf("fsid: %x %x\n", sblock->fs_id[0],
203			    sblock->fs_id[1]);
204	}
205
206	/* Randomize fs_id unless old 4.2BSD filesystem */
207	if ((sblock->fs_inodefmt >= FS_44INODEFMT) && !printonly) {
208		/* Randomize fs_id and write out new sblock and backups */
209		sblock->fs_id[0] = (u_int32_t)time(NULL);
210		sblock->fs_id[1] = random();
211
212		if (lseek(devfd, SBOFF, SEEK_SET) == -1) {
213			warn("can't seek to superblock (%qd) on %s", SBOFF,
214			    device);
215			return (1);
216		}
217		if ((n = write(devfd, (void *)sblock, SBSIZE)) != SBSIZE) {
218			warn("can't read superblock on %s: %s", device,
219			    (n < SBSIZE) ? "short write" : strerror(errno));
220			return (1);
221		}
222	}
223
224	/* For each cylinder group, randomize inodes and update backup sblock */
225	for (cg = 0, inumber = 0; cg < sblock->fs_ncg; cg++) {
226		/* Update superblock if appropriate */
227		if ((sblock->fs_inodefmt >= FS_44INODEFMT) && !printonly) {
228			dblk = fsbtodb(sblock, cgsblock(sblock, cg));
229			if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) {
230				warn("can't seek to %qd", (off_t)dblk * bsize);
231				return (1);
232			} else if ((n = write(devfd, (void *)sblock, SBSIZE)) != SBSIZE) {
233				warn("can't read backup superblock %d on %s: %s",
234				    cg + 1, device, (n < SBSIZE) ? "short write"
235				    : strerror(errno));
236				return (1);
237			}
238		}
239
240		/* Read in inodes, then print or randomize generation nums */
241		dblk = fsbtodb(sblock, ino_to_fsba(sblock, inumber));
242		if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) {
243			warn("can't seek to %qd", (off_t)dblk * bsize);
244			return (1);
245		} else if ((n = read(devfd, inodebuf, ibufsize)) != ibufsize) {
246			warnx("can't read inodes: %s",
247			     (n < ibufsize) ? "short read" : strerror(errno));
248			return (1);
249		}
250
251		for (n = 0; n < sblock->fs_ipg; n++, inumber++) {
252			if (inumber >= ROOTINO) {
253				if (printonly)
254					(void)printf("ino %d gen %x\n", inumber,
255						     inodebuf[n].di_gen);
256				else
257					inodebuf[n].di_gen = random();
258			}
259		}
260
261		/* Write out modified inodes */
262		if (!printonly) {
263			if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) {
264				warn("can't seek to %qd",
265				    (off_t)dblk * bsize);
266				return (1);
267			} else if ((n = write(devfd, inodebuf, ibufsize)) !=
268				 ibufsize) {
269				warnx("can't write inodes: %s",
270				     (n != ibufsize) ? "short write" :
271				     strerror(errno));
272				return (1);
273			}
274		}
275	}
276	(void)close(devfd);
277
278	return(0);
279}
280
281static void
282usage(void)
283{
284	(void)fprintf(stderr,
285		"usage: fsirand [-b] [-f] [-p] special [special ...]\n");
286	exit(1);
287}
288