1 /* $OpenBSD: scan_ffs.c,v 1.21 2015/11/23 19:19:30 deraadt 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 <sys/fcntl.h> 30 #include <ufs/ffs/fs.h> 31 #include <unistd.h> 32 #include <stdlib.h> 33 #include <stdio.h> 34 #include <string.h> 35 #include <time.h> 36 #include <limits.h> 37 #include <err.h> 38 #include <util.h> 39 40 #define SBCOUNT 64 /* XXX - Should be configurable */ 41 42 /* Flags to control ourselves... */ 43 #define FLAG_VERBOSE 1 44 #define FLAG_SMART 2 45 #define FLAG_LABELS 4 46 47 static void usage(void); 48 49 static int 50 ufsscan(int fd, daddr_t beg, daddr_t end, int flags) 51 { 52 static char lastmount[MAXMNTLEN]; 53 static u_int8_t buf[SBSIZE * SBCOUNT]; 54 struct fs *sb; 55 daddr_t blk, lastblk; 56 int n; 57 58 lastblk = -1; 59 memset(lastmount, 0, MAXMNTLEN); 60 61 for (blk = beg; blk <= ((end<0)?blk:end); blk += (SBCOUNT*SBSIZE/512)){ 62 memset(buf, 0, SBSIZE * SBCOUNT); 63 if (lseek(fd, (off_t)blk * 512, SEEK_SET) < 0) 64 err(1, "lseek"); 65 if (read(fd, buf, SBSIZE * SBCOUNT) < 0) 66 err(1, "read"); 67 68 for (n = 0; n < (SBSIZE * SBCOUNT); n += 512){ 69 sb = (struct fs*)(&buf[n]); 70 if (sb->fs_magic == FS_MAGIC) { 71 if (flags & FLAG_VERBOSE) 72 printf("block %lld id %x,%x size %d\n", 73 (long long)(blk + (n/512)), 74 sb->fs_id[0], sb->fs_id[1], 75 sb->fs_ffs1_size); 76 77 if (((blk+(n/512)) - lastblk) == (SBSIZE/512)) { 78 if (flags & FLAG_LABELS ) { 79 printf("X: %lld %lld 4.2BSD %d %d %d # %s\n", 80 ((off_t)sb->fs_ffs1_size * 81 sb->fs_fsize / 512), 82 (long long)(blk + (n/512) - 83 (2*SBSIZE/512)), 84 sb->fs_fsize, sb->fs_bsize, 85 sb->fs_cpg, lastmount); 86 } else { 87 /* XXX 2038 */ 88 time_t t = sb->fs_ffs1_time; 89 90 printf("ffs at %lld size %lld " 91 "mount %s time %s", 92 (long long)(blk+(n/512) - 93 (2*SBSIZE/512)), 94 (long long)(off_t)sb->fs_ffs1_size * 95 sb->fs_fsize, 96 lastmount, ctime(&t)); 97 } 98 99 if (flags & FLAG_SMART) { 100 off_t size = (off_t)sb->fs_ffs1_size * 101 sb->fs_fsize; 102 103 if ((n + size) < (SBSIZE * SBCOUNT)) 104 n += size; 105 else { 106 blk += (size/512 - 107 (SBCOUNT*SBCOUNT)); 108 break; 109 } 110 } 111 } 112 113 /* Update last potential FS SBs seen */ 114 lastblk = blk + (n/512); 115 memcpy(lastmount, sb->fs_fsmnt, MAXMNTLEN); 116 } 117 } 118 } 119 return(0); 120 } 121 122 123 static void 124 usage(void) 125 { 126 extern char *__progname; 127 128 fprintf(stderr, "usage: %s [-lsv] [-b begin] [-e end] device\n", 129 __progname); 130 exit(1); 131 } 132 133 134 int 135 main(int argc, char *argv[]) 136 { 137 int ch, fd, flags = 0; 138 daddr_t beg = 0, end = -1; 139 const char *errstr; 140 141 if (pledge("stdio rpath disklabel", NULL) == -1) 142 err(1, "pledge"); 143 144 while ((ch = getopt(argc, argv, "lsvb:e:")) != -1) 145 switch(ch) { 146 case 'b': 147 beg = strtonum(optarg, 0, LLONG_MAX, &errstr); 148 if (errstr) 149 errx(1, "%s: %s", optarg, errstr); 150 break; 151 case 'e': 152 end = strtonum(optarg, 0, LLONG_MAX, &errstr); 153 if (errstr) 154 errx(1, "%s: %s", optarg, errstr); 155 break; 156 case 'v': 157 flags |= FLAG_VERBOSE; 158 break; 159 case 's': 160 flags |= FLAG_SMART; 161 break; 162 case 'l': 163 flags |= FLAG_LABELS; 164 break; 165 default: 166 usage(); 167 /* NOTREACHED */ 168 } 169 argc -= optind; 170 argv += optind; 171 172 if (argc != 1) 173 usage(); 174 175 fd = opendev(argv[0], O_RDONLY, OPENDEV_PART, NULL); 176 if (fd < 0) 177 err(1, "%s", argv[0]); 178 179 if (pledge("stdio", NULL) == -1) 180 err(1, "pledge"); 181 182 return (ufsscan(fd, beg, end, flags)); 183 } 184