1/*-
2 * Copyright (c) 2002, 2003 Gordon Tetlow
3 * Copyright (c) 2006 Pawel Jakub Dawidek <pjd@FreeBSD.org>
4 * Copyright (c) 2014 The FreeBSD Foundation
5 * All rights reserved.
6 *
7 * This software was developed by Edward Tomasz Napierala under sponsorship
8 * from the FreeBSD Foundation.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33__FBSDID("$FreeBSD: releng/10.3/usr.sbin/fstyp/ufs.c 275680 2014-12-10 14:14:16Z trasz $");
34
35#include <sys/types.h>
36#include <stdint.h>
37#include <stdio.h>
38#include <stdlib.h>
39#include <string.h>
40
41#include <ufs/ufs/dinode.h>
42#include <ufs/ffs/fs.h>
43
44#include "fstyp.h"
45
46static const int superblocks[] = SBLOCKSEARCH;
47
48int
49fstyp_ufs(FILE *fp, char *label, size_t labelsize)
50{
51	int sb, superblock;
52	struct fs *fs;
53
54	/*
55	 * Walk through the standard places that superblocks hide and look
56	 * for UFS magic. If we find magic, then check that the size in the
57	 * superblock corresponds to the size of the underlying provider.
58	 * Finally, look for a volume label and create an appropriate
59	 * provider based on that.
60	 */
61	for (sb = 0; (superblock = superblocks[sb]) != -1; sb++) {
62		fs = (struct fs *)read_buf(fp, superblock, SBLOCKSIZE);
63		if (fs == NULL)
64			continue;
65		/*
66		 * Check for magic. We also need to check if file system size is equal
67		 * to providers size, because sysinstall(8) used to bogusly put first
68		 * partition at offset 0 instead of 16, and glabel/ufs would find file
69		 * system on slice instead of partition.
70		 */
71#ifdef notyet
72		if (fs->fs_magic == FS_UFS1_MAGIC && fs->fs_fsize > 0 &&
73		    ((pp->mediasize / fs->fs_fsize == fs->fs_old_size) ||
74		    (pp->mediasize / fs->fs_fsize == fs->fs_providersize))) {
75		    	/* Valid UFS1. */
76		} else if (fs->fs_magic == FS_UFS2_MAGIC && fs->fs_fsize > 0 &&
77		    ((pp->mediasize / fs->fs_fsize == fs->fs_size) ||
78		    (pp->mediasize / fs->fs_fsize == fs->fs_providersize))) {
79		    	/* Valid UFS2. */
80		} else {
81			g_free(fs);
82			continue;
83		}
84#else
85		if (fs->fs_magic == FS_UFS1_MAGIC && fs->fs_fsize > 0) {
86		    	/* Valid UFS1. */
87		} else if (fs->fs_magic == FS_UFS2_MAGIC && fs->fs_fsize > 0) {
88		    	/* Valid UFS2. */
89		} else {
90			free(fs);
91			continue;
92		}
93#endif
94
95		if (fs->fs_sblockloc != superblock || fs->fs_ncg < 1 ||
96		    fs->fs_bsize < MINBSIZE ||
97		    (size_t)fs->fs_bsize < sizeof(struct fs)) {
98			free(fs);
99			continue;
100		}
101
102		strlcpy(label, fs->fs_volname, labelsize);
103
104		free(fs);
105		return (0);
106	}
107
108	return (1);
109}
110