1 /* $OpenBSD: scan_ffs.c,v 1.24 2024/05/09 08:35:40 florian Exp $ */
2
3 /*
4 * Copyright (c) 1998 Niklas Hallqvist, Tobias Weingartner
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 #include <sys/types.h>
29 #include <ufs/ffs/fs.h>
30
31 #include <err.h>
32 #include <fcntl.h>
33 #include <limits.h>
34 #include <stdio.h>
35 #include <stdlib.h>
36 #include <string.h>
37 #include <time.h>
38 #include <unistd.h>
39 #include <util.h>
40
41 #define SBCOUNT 64 /* XXX - Should be configurable */
42
43 /* Flags to control ourselves... */
44 #define FLAG_VERBOSE 1
45 #define FLAG_SMART 2
46 #define FLAG_LABELS 4
47
48 static void usage(void);
49
50 static void
print_info(int flags,struct fs * sb,long long at,char * lastmount)51 print_info(int flags, struct fs *sb, long long at, char* lastmount)
52 {
53 if (flags & FLAG_LABELS ) {
54 printf("X: %lld %lld 4.2BSD %d %d %d # %s\n",
55 ((off_t)sb->fs_ffs1_size * sb->fs_fsize / 512), at,
56 sb->fs_fsize, sb->fs_bsize, sb->fs_cpg, lastmount);
57 } else {
58 /* XXX 2038 */
59 time_t t = sb->fs_ffs1_time;
60 char *ct = ctime(&t);
61 if (ct)
62 printf("ffs at %lld size %lld mount %s time %s", at,
63 (long long)(off_t) sb->fs_ffs1_size * sb->fs_fsize,
64 lastmount, ct);
65 else
66 printf("ffs at %lld size %lld mount %s time %lld\n", at,
67 (long long)(off_t) sb->fs_ffs1_size * sb->fs_fsize,
68 lastmount, t);
69 }
70 }
71
72 static int
ufsscan(int fd,daddr_t beg,daddr_t end,int flags)73 ufsscan(int fd, daddr_t beg, daddr_t end, int flags)
74 {
75 static char lastmount[MAXMNTLEN];
76 static u_int8_t buf[SBSIZE * SBCOUNT];
77 struct fs *sb;
78 daddr_t blk, lastblk;
79 int n;
80
81 lastblk = -1;
82 memset(lastmount, 0, MAXMNTLEN);
83
84 for (blk = beg; blk <= ((end<0)?blk:end); blk += (SBCOUNT*SBSIZE/512)){
85 memset(buf, 0, SBSIZE * SBCOUNT);
86 if (lseek(fd, (off_t)blk * 512, SEEK_SET) == -1)
87 err(1, "lseek");
88 if (read(fd, buf, SBSIZE * SBCOUNT) == -1)
89 err(1, "read");
90
91 for (n = 0; n < (SBSIZE * SBCOUNT); n += 512){
92 sb = (struct fs*)(&buf[n]);
93 if (sb->fs_magic == FS_MAGIC) {
94 if (flags & FLAG_VERBOSE)
95 printf("block %lld id %x,%x size %d\n",
96 (long long)(blk + (n/512)),
97 sb->fs_id[0], sb->fs_id[1],
98 sb->fs_ffs1_size);
99
100 if (((blk+(n/512)) - lastblk) == (SBSIZE/512)) {
101 print_info(flags, sb,
102 (long long)(blk + (n/512) -
103 (2*SBSIZE/512)), lastmount);
104 if (flags & FLAG_SMART) {
105 off_t size = (off_t)sb->fs_ffs1_size *
106 sb->fs_fsize;
107
108 if ((n + size) < (SBSIZE * SBCOUNT))
109 n += size;
110 else {
111 blk += (size/512 -
112 (SBCOUNT*SBCOUNT));
113 break;
114 }
115 }
116 }
117
118 /* Update last potential FS SBs seen */
119 lastblk = blk + (n/512);
120 memcpy(lastmount, sb->fs_fsmnt, MAXMNTLEN);
121 }
122 }
123 }
124 return(0);
125 }
126
127
128 static void
usage(void)129 usage(void)
130 {
131 extern char *__progname;
132
133 fprintf(stderr, "usage: %s [-lsv] [-b begin] [-e end] device\n",
134 __progname);
135 exit(1);
136 }
137
138
139 int
main(int argc,char * argv[])140 main(int argc, char *argv[])
141 {
142 int ch, fd, flags = 0;
143 daddr_t beg = 0, end = -1;
144 const char *errstr;
145
146 if (pledge("stdio rpath disklabel", NULL) == -1)
147 err(1, "pledge");
148
149 while ((ch = getopt(argc, argv, "lsvb:e:")) != -1)
150 switch(ch) {
151 case 'b':
152 beg = strtonum(optarg, 0, LLONG_MAX, &errstr);
153 if (errstr)
154 errx(1, "%s: %s", optarg, errstr);
155 break;
156 case 'e':
157 end = strtonum(optarg, 0, LLONG_MAX, &errstr);
158 if (errstr)
159 errx(1, "%s: %s", optarg, errstr);
160 break;
161 case 'v':
162 flags |= FLAG_VERBOSE;
163 break;
164 case 's':
165 flags |= FLAG_SMART;
166 break;
167 case 'l':
168 flags |= FLAG_LABELS;
169 break;
170 default:
171 usage();
172 /* NOTREACHED */
173 }
174 argc -= optind;
175 argv += optind;
176
177 if (argc != 1)
178 usage();
179
180 fd = opendev(argv[0], O_RDONLY, OPENDEV_PART, NULL);
181 if (fd == -1)
182 err(1, "%s", argv[0]);
183
184 if (pledge("stdio", NULL) == -1)
185 err(1, "pledge");
186
187 return (ufsscan(fd, beg, end, flags));
188 }
189