Am Mittwoch, 19. Februar 2003 22:20 schrieb Michael Ranner:
> Hello!
>
> I am trying to learn scan_ffs (original from OpenBSD, ported to FreeBSD
> by Robert Watson) about UFS2 on 5-CURRENT, but it will not find the
> Superblock and I dont understand exactly both for loops, especially
> that 512 byte increment.
>
Ok, now scan_ffs can detect a UFS2 filesystem, but scan_ffs does
not calculate the correct offset for the disklabel. Further I do
not unterstand the "smart" feature of scan_ffs fully at the moment.
Where to I find CPG in an UFS2 superblock? How can I detect, if
scan_ffs should display fs_old_cpg or the new cpg value. Which
fields hold the new cpg value in the superblock?
Regards,
--
/\/\ichael Ranner
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-----BEGIN GEEK CODE BLOCK-----
GIT/CS/AT dx(-) s+:(++:) a- C++ UBLVS++++$ P++>+++$ L-(+)$ E---
W+++$ N+(++) o-- K- w--()$ O-(--) M@ V-(--) PS+>++ PE(-) Y+ PGP(-)
t+ 5+ X+++(++++) R* tv++ b+(++) DI++ D-(--) G- e h--(*) r++ y?
------END GEEK CODE BLOCK------
/* $OpenBSD: scan_ffs.c,v 1.8 2002/07/03 22:32:33 deraadt Exp $ */
/*
* Copyright (c) 1998 Niklas Hallqvist, Tobias Weingartner
* 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 Tobias Weingartner.
* 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 BY THE AUTHOR ``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.
*/
#include <sys/types.h>
#include <sys/param.h>
#include <sys/fcntl.h>
#ifdef __FreeBSD__
#include <ufs/ufs/dinode.h>
#endif
#include <ufs/ffs/fs.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <err.h>
#if 0
#include <util.h>
#endif
#ifdef __FreeBSD__
#define SBSIZE SBLOCKSIZE
#endif
#define SBCOUNT 64 /* XXX - Should be configurable */
/* Flags to control ourselves... */
#define FLAG_VERBOSE 1
#define FLAG_SMART 2
#define FLAG_LABELS 4
int
ufsscan(int fd, daddr_t beg, daddr_t end, int flags)
{
static char lastmount[MAXMNTLEN];
static u_int8_t buf[SBSIZE * SBCOUNT];
struct fs *sb;
daddr_t blk, lastblk;
int n;
#ifdef __FreeBSD__
int ufs;
#endif
lastblk = -1;
memset(lastmount, 0, MAXMNTLEN);
for (blk = beg; blk <= ((end<0)?blk:end); blk += (SBCOUNT*SBSIZE/512)){
memset(buf, 0, SBSIZE * SBCOUNT);
if (lseek(fd, (off_t)blk * 512, SEEK_SET) < 0)
err(1, "lseek");
if (read(fd, buf, SBSIZE * SBCOUNT) < 0)
err(1, "read");
for (n = 0; n < (SBSIZE * SBCOUNT); n += 512){
#ifdef __FreeBSD__
ufs = 0;
#endif
sb = (struct fs*)(&buf[n]);
#ifdef __FreeBSD__
if (sb->fs_magic == FS_UFS1_MAGIC)
ufs = 1;
if (sb->fs_magic == FS_UFS2_MAGIC)
ufs = 2;
if (ufs > 0) {
#else
if (sb->fs_magic == FS_MAGIC)
#endif
if (flags & FLAG_VERBOSE)
printf("block %d id %x,%x size %d\n",
blk + (n/512), sb->fs_id[0],
sb->fs_id[1], sb->fs_size);
#ifdef __FreeBSD__
if (((blk+(n/512)) - lastblk) == (SBSIZE*ufs/512)) {
#else
if (((blk+(n/512)) - lastblk) == (SBSIZE/512)) {
#endif
if (flags & FLAG_LABELS ) {
#ifdef __FreeBSD__
printf("X: %lld %lld 4.2BSD %ld %ld %ld # %s\n",
#else
printf("X: %d %d 4.2BSD %d %d %d # %s\n",
#endif
(daddr_t)((off_t)sb->fs_size *
sb->fs_fsize / 512),
blk+(n/512)-(2*SBSIZE/512),
sb->fs_fsize, sb->fs_bsize,
#ifdef __FreeBSD__
sb->fs_old_cpg, lastmount);
} else {
printf("ufs%d at %lld size %lld mount %s time %s\n",
ufs,
#else
sb->fs_cpg, lastmount);
} else {
printf("ffs at %d size %lld mount %s time %s\n",
#endif
blk+(n/512)-(2*SBSIZE/512),
(long long)(off_t)sb->fs_size *
sb->fs_fsize,
lastmount, ctime((time_t *)&sb->fs_time));
}
if (flags & FLAG_SMART) {
off_t size = (off_t)sb->fs_size *
sb->fs_fsize;
if ((n + size) < (SBSIZE * SBCOUNT))
n += size;
else {
blk += (size/512 -
(SBCOUNT*SBCOUNT));
break;
}
}
}
/* Update last potential FS SBs seen */
lastblk = blk + (n/512);
memcpy(lastmount, sb->fs_fsmnt, MAXMNTLEN);
}
}
}
return(0);
}
void
usage(int code)
{
extern char *__progname;
fprintf(stderr, "usage: %s [-lsv] [-b begin] [-e end] device\n",
__progname);
exit(code);
}
int
main(int argc, char *argv[])
{
#ifdef __FreeBSD__
char *name;
#endif
int ch, fd, flags = 0;
daddr_t beg = 0, end = -1;
while ((ch = getopt(argc, argv, "lsvb:e:")) != -1)
switch(ch) {
case 'b':
beg = atoi(optarg);
break;
case 'e':
end = atoi(optarg);
break;
case 'v':
flags |= FLAG_VERBOSE;
break;
case 's':
flags |= FLAG_SMART;
break;
case 'l':
flags |= FLAG_LABELS;
break;
default:
usage(1);
/* NOTREACHED */
}
argc -= optind;
argv += optind;
if (argc != 1)
usage(1);
#ifdef __FreeBSD__
if (argv[0][0] != '/') {
if (asprintf(&name, "/dev/%s", argv[0]) == -1)
err(1, "%s", argv[1]);
} else
name = argv[0];
fd = open(name, O_RDONLY);
#else
fd = opendev(argv[0], O_RDONLY, OPENDEV_PART, NULL);
#endif
if (fd < 0)
err(1, "%s", argv[1]);
#ifdef __FreeBSD__
if (name != argv[0])
free(name);
#endif
return (ufsscan(fd, beg, end, flags));
}
