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/* $OpenBSD: badsect.c,v 1.28 2019/06/28 13:32:43 deraadt Exp $ */
/* $NetBSD: badsect.c,v 1.10 1995/03/18 14:54:28 cgd Exp $ */
/*
* Copyright (c) 1981, 1983, 1993
* The Regents of the University of California. 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. 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.
*/
/*
* badsect
*
* Badsect takes a list of file-system relative sector numbers
* and makes files containing the blocks of which these sectors are a part.
* It can be used to contain sectors which have problems if these sectors
* are not part of the bad file for the pack (see bad144). For instance,
* this program can be used if the driver for the file system in question
* does not support bad block forwarding.
*/
#include <sys/param.h> /* MAXBSIZE DEV_BSIZE isclr */
#include <sys/stat.h>
#include <ufs/ffs/fs.h>
#include <ufs/ufs/dinode.h>
#include <dirent.h>
#include <fcntl.h>
#include <paths.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <limits.h>
#include <err.h>
static int chkuse(daddr_t, int);
static void rdfs(daddr_t, int, char *);
static union {
struct fs fs;
char fsx[SBSIZE];
} ufs;
#define sblock ufs.fs
static union {
struct cg cg;
char cgx[MAXBSIZE];
} ucg;
#define acg ucg.cg
static struct fs *fs;
static int fsi;
static int errs;
int
main(int argc, char *argv[])
{
daddr_t number;
struct stat stbuf, devstat;
struct dirent *dp;
DIR *dirp;
char name[BUFSIZ];
int len;
if (argc < 3) {
fprintf(stderr, "usage: badsect bbdir sector ...\n");
exit(1);
}
if (chdir(argv[1]) == -1 || stat(".", &stbuf) == -1)
err(2, "%s", argv[1]);
strlcpy(name, _PATH_DEV, sizeof name);
len = strlen(name);
if ((dirp = opendir(name)) == NULL)
err(3, "%s", name);
while ((dp = readdir(dirp)) != NULL) {
strlcpy(&name[len], dp->d_name, sizeof name - len);
if (stat(name, &devstat) == -1)
err(4, "%s", name);
if (stbuf.st_dev == devstat.st_rdev &&
S_ISBLK(devstat.st_mode))
break;
}
/*
* We've found the block device, but since the filesystem
* is mounted, we must write to the raw (character) device
* instead. This is not guaranteed to work if someone has a
* /dev that doesn't follow standard naming conventions, but
* it's all we've got.
*/
name[len] = 'r';
strlcpy(&name[len+1], dp->d_name, sizeof name - (len+1));
closedir(dirp);
if (dp == NULL)
err(5, "Cannot find dev 0%o corresponding to %s",
stbuf.st_rdev, argv[1]);
if ((fsi = open(name, O_RDONLY)) == -1)
err(6, "%s", name);
fs = &sblock;
rdfs(SBOFF, SBSIZE, (char *)fs);
for (argc -= 2, argv += 2; argc > 0; argc--, argv++) {
number = strtonum(*argv, 0, QUAD_MAX, NULL);
if (chkuse(number, 1))
continue;
if (mknod(*argv, S_IFMT|S_IRUSR|S_IWUSR,
dbtofsb(fs, number)) < 0) {
warn("%s", *argv);
errs++;
}
}
printf("Don't forget to run ``fsck %s''\n", name);
exit(errs);
}
static int
chkuse(daddr_t blkno, int cnt)
{
int cg;
daddr_t fsbn, bn;
fsbn = dbtofsb(fs, blkno);
if (fsbn+cnt > fs->fs_ffs1_size) {
fprintf(stderr, "block %lld out of range of file system\n",
(long long)blkno);
return (1);
}
cg = dtog(fs, fsbn);
if (fsbn < cgdmin(fs, cg)) {
if (cg == 0 || (fsbn+cnt) > cgsblock(fs, cg)) {
fprintf(stderr, "block %lld in non-data area: cannot "
"attach\n", (long long)blkno);
return (1);
}
} else {
if ((fsbn+cnt) > cgbase(fs, cg+1)) {
fprintf(stderr, "block %lld in non-data area: cannot "
"attach\n", (long long)blkno);
return (1);
}
}
rdfs(fsbtodb(fs, cgtod(fs, cg)), (int)sblock.fs_cgsize,
(char *)&acg);
if (!cg_chkmagic(&acg)) {
fprintf(stderr, "cg %d: bad magic number\n", cg);
errs++;
return (1);
}
bn = dtogd(fs, fsbn);
if (isclr(cg_blksfree(&acg), bn))
fprintf(stderr, "Warning: sector %lld is in use\n",
(long long)blkno);
return (0);
}
/*
* read a block from the file system
*/
static void
rdfs(daddr_t bno, int size, char *bf)
{
if (pread(fsi, bf, size, bno * DEV_BSIZE) != size) {
fprintf(stderr, "read error: %lld\n", (long long)bno);
err(1, "rdfs");
}
}
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