src/sbin/scan_ffs/scan_ffs.c

/*	$OpenBSD: scan_ffs.c,v 1.24 2024/05/09 08:35:40 florian 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.
 *
 * 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 <ufs/ffs/fs.h>

#include <err.h>
#include <fcntl.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <util.h>

#define SBCOUNT 64		/* XXX - Should be configurable */

/* Flags to control ourselves... */
#define FLAG_VERBOSE		1
#define FLAG_SMART		2
#define FLAG_LABELS		4

static void usage(void);

static void
print_info(int flags, struct fs *sb, long long at, char* lastmount)
{
	if (flags & FLAG_LABELS ) {
		printf("X: %lld %lld 4.2BSD %d %d %d # %s\n",
		    ((off_t)sb->fs_ffs1_size * sb->fs_fsize / 512), at,
		    sb->fs_fsize, sb->fs_bsize, sb->fs_cpg, lastmount);
	} else {
		/* XXX 2038 */
		time_t t = sb->fs_ffs1_time;
		char *ct = ctime(&t);
		if (ct)
			printf("ffs at %lld size %lld mount %s time %s", at,
			    (long long)(off_t) sb->fs_ffs1_size * sb->fs_fsize,
			    lastmount, ct);
		else
			printf("ffs at %lld size %lld mount %s time %lld\n", at,
			    (long long)(off_t) sb->fs_ffs1_size * sb->fs_fsize,
			    lastmount, t);
	}
}

static 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;

	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) == -1)
		    err(1, "lseek");
		if (read(fd, buf, SBSIZE * SBCOUNT) == -1)
			err(1, "read");

		for (n = 0; n < (SBSIZE * SBCOUNT); n += 512){
			sb = (struct fs*)(&buf[n]);
			if (sb->fs_magic == FS_MAGIC) {
				if (flags & FLAG_VERBOSE)
					printf("block %lld id %x,%x size %d\n",
					    (long long)(blk + (n/512)),
					    sb->fs_id[0], sb->fs_id[1],
					    sb->fs_ffs1_size);

				if (((blk+(n/512)) - lastblk) == (SBSIZE/512)) {
					print_info(flags, sb,
					    (long long)(blk + (n/512) -
					    (2*SBSIZE/512)),  lastmount);
					if (flags & FLAG_SMART) {
						off_t size = (off_t)sb->fs_ffs1_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);
}


static void
usage(void)
{
	extern char *__progname;

	fprintf(stderr, "usage: %s [-lsv] [-b begin] [-e end] device\n",
	    __progname);
	exit(1);
}


int
main(int argc, char *argv[])
{
	int ch, fd, flags = 0;
	daddr_t beg = 0, end = -1;
	const char *errstr;

	if (pledge("stdio rpath disklabel", NULL) == -1)
		err(1, "pledge");

	while ((ch = getopt(argc, argv, "lsvb:e:")) != -1)
		switch(ch) {
		case 'b':
			beg = strtonum(optarg, 0, LLONG_MAX, &errstr);
			if (errstr)
				errx(1, "%s: %s", optarg, errstr);
			break;
		case 'e':
			end = strtonum(optarg, 0, LLONG_MAX, &errstr);
			if (errstr)
				errx(1, "%s: %s", optarg, errstr);
			break;
		case 'v':
			flags |= FLAG_VERBOSE;
			break;
		case 's':
			flags |= FLAG_SMART;
			break;
		case 'l':
			flags |= FLAG_LABELS;
			break;
		default:
			usage();
			/* NOTREACHED */
	}
	argc -= optind;
	argv += optind;

	if (argc != 1)
		usage();

	fd = opendev(argv[0], O_RDONLY, OPENDEV_PART, NULL);
	if (fd == -1)
		err(1, "%s", argv[0]);

	if (pledge("stdio", NULL) == -1)
		err(1, "pledge");

	return (ufsscan(fd, beg, end, flags));
}