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
|
/* $OpenBSD: clri.c,v 1.14 2015/01/16 06:39:56 deraadt Exp $ */
/* $NetBSD: clri.c,v 1.19 2005/01/20 15:50:47 xtraeme Exp $ */
/*
* Copyright (c) 1990, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Rich $alz of BBN Inc.
*
* 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. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
*/
#include <sys/param.h> /* MAXFRAG MAXBSIZE DEV_BSIZE */
#include <ufs/ufs/dinode.h>
#include <ufs/ffs/fs.h>
#include <err.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <unistd.h>
/*
* Possible superblock locations ordered from most to least likely.
*/
static int sblock_try[] = SBLOCKSEARCH;
static void
usage(void)
{
(void)fprintf(stderr, "usage: clri special_device inode_number ...\n");
exit(1);
}
int
main(int argc, char *argv[])
{
struct ufs1_dinode *dp1;
struct ufs2_dinode *dp2;
struct fs *sbp;
char *ibuf[MAXBSIZE];
char *fs, sblock[SBLOCKSIZE];
size_t bsize;
off_t offset;
int i, fd, imax, inonum;
if (argc < 3)
usage();
fs = *++argv;
sbp = NULL;
/* get the superblock. */
if ((fd = open(fs, O_RDWR, 0)) < 0)
err(1, "%s", fs);
for (i = 0; sblock_try[i] != -1; i++) {
offset = (off_t)(sblock_try[i]);
if (pread(fd, sblock, sizeof(sblock), offset) != sizeof(sblock))
err(1, "%s: can't read superblock", fs);
sbp = (struct fs *)sblock;
if ((sbp->fs_magic == FS_UFS1_MAGIC ||
(sbp->fs_magic == FS_UFS2_MAGIC &&
sbp->fs_sblockloc == sblock_try[i])) &&
sbp->fs_bsize <= MAXBSIZE &&
sbp->fs_bsize >= (int)sizeof(struct fs))
break;
}
if (sblock_try[i] == -1)
errx(2, "cannot find file system superblock");
bsize = sbp->fs_bsize;
/* check that inode numbers are valid */
imax = sbp->fs_ncg * sbp->fs_ipg;
for (i = 1; i < (argc - 1); i++) {
if (atoi(argv[i]) <= 0 || atoi(argv[i]) >= imax)
errx(1, "%s is not a valid inode number", argv[i]);
}
/* clear the clean flag in the superblock */
if (sbp->fs_inodefmt >= FS_44INODEFMT) {
sbp->fs_clean = 0;
if (pwrite(fd, sblock, sizeof(sblock), offset) != sizeof(sblock))
err(1, "%s: can't update superblock", fs);
(void)fsync(fd);
}
/* remaining arguments are inode numbers. */
while (*++argv) {
/* get the inode number. */
inonum = atoi(*argv);
(void)printf("clearing %llu\n", (unsigned long long)inonum);
/* read in the appropriate block. */
offset = ino_to_fsba(sbp, inonum); /* inode to fs blk */
offset = fsbtodb(sbp, offset); /* fs blk disk blk */
offset *= DEV_BSIZE; /* disk blk to bytes */
/* seek and read the block */
if (pread(fd, ibuf, bsize, offset) != bsize)
err(1, "%s", fs);
if (sbp->fs_magic == FS_UFS2_MAGIC) {
/* get the inode within the block. */
dp2 = &(((struct ufs2_dinode *)ibuf)
[ino_to_fsbo(sbp, inonum)]);
/* clear the inode, and bump the generation count. */
memset(dp2, 0, sizeof(*dp2));
dp2->di_gen = arc4random();
} else {
/* get the inode within the block. */
dp1 = &(((struct ufs1_dinode *)ibuf)
[ino_to_fsbo(sbp, inonum)]);
/* clear the inode, and bump the generation count. */
memset(dp1, 0, sizeof(*dp1));
dp1->di_gen = arc4random();
}
/* backup and write the block */
if (pwrite(fd, ibuf, bsize, offset) != bsize)
err(1, "%s", fs);
(void)fsync(fd);
}
(void)close(fd);
exit(0);
}
|
