1 /* $OpenBSD: fsirand.c,v 1.9 1997/02/28 00:46:33 millert Exp $ */ 2 3 /*- 4 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 5 * 6 * Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com> 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by Todd C. Miller. 20 * 4. The name of the author may not be used to endorse or promote products 21 * derived from this software without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, 24 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY 25 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 26 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 27 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 28 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 29 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 30 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 31 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 32 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 33 */ 34 35 #ifndef lint 36 static const char rcsid[] = 37 "$FreeBSD$"; 38 #endif /* not lint */ 39 40 #include <sys/param.h> 41 #include <sys/resource.h> 42 43 #include <ufs/ufs/dinode.h> 44 #include <ufs/ffs/fs.h> 45 46 #include <err.h> 47 #include <errno.h> 48 #include <fcntl.h> 49 #include <stdio.h> 50 #include <stdint.h> 51 #include <stdlib.h> 52 #include <string.h> 53 #include <time.h> 54 #include <unistd.h> 55 56 static void usage(void) __dead2; 57 int fsirand(char *); 58 59 /* 60 * Possible superblock locations ordered from most to least likely. 61 */ 62 static int sblock_try[] = SBLOCKSEARCH; 63 64 static int printonly = 0, force = 0, ignorelabel = 0; 65 66 int 67 main(int argc, char *argv[]) 68 { 69 int n, ex = 0; 70 struct rlimit rl; 71 72 while ((n = getopt(argc, argv, "bfp")) != -1) { 73 switch (n) { 74 case 'b': 75 ignorelabel++; 76 break; 77 case 'p': 78 printonly++; 79 break; 80 case 'f': 81 force++; 82 break; 83 default: 84 usage(); 85 } 86 } 87 if (argc - optind < 1) 88 usage(); 89 90 srandomdev(); 91 92 /* Increase our data size to the max */ 93 if (getrlimit(RLIMIT_DATA, &rl) == 0) { 94 rl.rlim_cur = rl.rlim_max; 95 if (setrlimit(RLIMIT_DATA, &rl) < 0) 96 warn("can't get resource limit to max data size"); 97 } else 98 warn("can't get resource limit for data size"); 99 100 for (n = optind; n < argc; n++) { 101 if (argc - optind != 1) 102 (void)puts(argv[n]); 103 ex += fsirand(argv[n]); 104 if (n < argc - 1) 105 putchar('\n'); 106 } 107 108 exit(ex); 109 } 110 111 int 112 fsirand(char *device) 113 { 114 struct ufs1_dinode *dp1; 115 struct ufs2_dinode *dp2; 116 caddr_t inodebuf; 117 ssize_t ibufsize; 118 struct fs *sblock; 119 ino_t inumber; 120 ufs2_daddr_t sblockloc, dblk; 121 char sbuf[SBLOCKSIZE], sbuftmp[SBLOCKSIZE]; 122 int i, devfd, n, cg; 123 u_int32_t bsize = DEV_BSIZE; 124 125 if ((devfd = open(device, printonly ? O_RDONLY : O_RDWR)) < 0) { 126 warn("can't open %s", device); 127 return (1); 128 } 129 130 dp1 = NULL; 131 dp2 = NULL; 132 133 /* Read in master superblock */ 134 (void)memset(&sbuf, 0, sizeof(sbuf)); 135 sblock = (struct fs *)&sbuf; 136 for (i = 0; sblock_try[i] != -1; i++) { 137 sblockloc = sblock_try[i]; 138 if (lseek(devfd, sblockloc, SEEK_SET) == -1) { 139 warn("can't seek to superblock (%jd) on %s", 140 (intmax_t)sblockloc, device); 141 return (1); 142 } 143 if ((n = read(devfd, (void *)sblock, SBLOCKSIZE))!=SBLOCKSIZE) { 144 warnx("can't read superblock on %s: %s", device, 145 (n < SBLOCKSIZE) ? "short read" : strerror(errno)); 146 return (1); 147 } 148 if ((sblock->fs_magic == FS_UFS1_MAGIC || 149 (sblock->fs_magic == FS_UFS2_MAGIC && 150 sblock->fs_sblockloc == sblock_try[i])) && 151 sblock->fs_bsize <= MAXBSIZE && 152 sblock->fs_bsize >= (ssize_t)sizeof(struct fs)) 153 break; 154 } 155 if (sblock_try[i] == -1) { 156 fprintf(stderr, "Cannot find file system superblock\n"); 157 return (1); 158 } 159 160 if (sblock->fs_magic == FS_UFS1_MAGIC && 161 sblock->fs_old_inodefmt < FS_44INODEFMT) { 162 warnx("file system format is too old, sorry"); 163 return (1); 164 } 165 if (!force && !printonly && sblock->fs_clean != 1) { 166 warnx("file system is not clean, fsck %s first", device); 167 return (1); 168 } 169 170 /* Make sure backup superblocks are sane. */ 171 sblock = (struct fs *)&sbuftmp; 172 for (cg = 0; cg < (int)sblock->fs_ncg; cg++) { 173 dblk = fsbtodb(sblock, cgsblock(sblock, cg)); 174 if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) { 175 warn("can't seek to %jd", (intmax_t)dblk * bsize); 176 return (1); 177 } else if ((n = write(devfd, (void *)sblock, SBLOCKSIZE)) != SBLOCKSIZE) { 178 warn("can't read backup superblock %d on %s: %s", 179 cg + 1, device, (n < SBLOCKSIZE) ? "short write" 180 : strerror(errno)); 181 return (1); 182 } 183 if (sblock->fs_magic != FS_UFS1_MAGIC && 184 sblock->fs_magic != FS_UFS2_MAGIC) { 185 warnx("bad magic number in backup superblock %d on %s", 186 cg + 1, device); 187 return (1); 188 } 189 if (sblock->fs_sbsize > SBLOCKSIZE) { 190 warnx("size of backup superblock %d on %s is preposterous", 191 cg + 1, device); 192 return (1); 193 } 194 } 195 sblock = (struct fs *)&sbuf; 196 197 /* XXX - should really cap buffer at 512kb or so */ 198 if (sblock->fs_magic == FS_UFS1_MAGIC) 199 ibufsize = sizeof(struct ufs1_dinode) * sblock->fs_ipg; 200 else 201 ibufsize = sizeof(struct ufs2_dinode) * sblock->fs_ipg; 202 if ((inodebuf = malloc(ibufsize)) == NULL) 203 errx(1, "can't allocate memory for inode buffer"); 204 205 if (printonly && (sblock->fs_id[0] || sblock->fs_id[1])) { 206 if (sblock->fs_id[0]) 207 (void)printf("%s was randomized on %s", device, 208 ctime((void *)&(sblock->fs_id[0]))); 209 (void)printf("fsid: %x %x\n", sblock->fs_id[0], 210 sblock->fs_id[1]); 211 } 212 213 /* Randomize fs_id unless old 4.2BSD file system */ 214 if (!printonly) { 215 /* Randomize fs_id and write out new sblock and backups */ 216 sblock->fs_id[0] = (u_int32_t)time(NULL); 217 sblock->fs_id[1] = random(); 218 219 if (lseek(devfd, sblockloc, SEEK_SET) == -1) { 220 warn("can't seek to superblock (%jd) on %s", 221 (intmax_t)sblockloc, device); 222 return (1); 223 } 224 if ((n = write(devfd, (void *)sblock, SBLOCKSIZE)) != 225 SBLOCKSIZE) { 226 warn("can't write superblock on %s: %s", device, 227 (n < SBLOCKSIZE) ? "short write" : strerror(errno)); 228 return (1); 229 } 230 } 231 232 /* For each cylinder group, randomize inodes and update backup sblock */ 233 for (cg = 0, inumber = 0; cg < (int)sblock->fs_ncg; cg++) { 234 /* Update superblock if appropriate */ 235 if (!printonly) { 236 dblk = fsbtodb(sblock, cgsblock(sblock, cg)); 237 if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) { 238 warn("can't seek to %jd", 239 (intmax_t)dblk * bsize); 240 return (1); 241 } else if ((n = write(devfd, (void *)sblock, 242 SBLOCKSIZE)) != SBLOCKSIZE) { 243 warn("can't write backup superblock %d on %s: %s", 244 cg + 1, device, (n < SBLOCKSIZE) ? 245 "short write" : strerror(errno)); 246 return (1); 247 } 248 } 249 250 /* Read in inodes, then print or randomize generation nums */ 251 dblk = fsbtodb(sblock, ino_to_fsba(sblock, inumber)); 252 if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) { 253 warn("can't seek to %jd", (intmax_t)dblk * bsize); 254 return (1); 255 } else if ((n = read(devfd, inodebuf, ibufsize)) != ibufsize) { 256 warnx("can't read inodes: %s", 257 (n < ibufsize) ? "short read" : strerror(errno)); 258 return (1); 259 } 260 261 for (n = 0; n < (int)sblock->fs_ipg; n++, inumber++) { 262 if (sblock->fs_magic == FS_UFS1_MAGIC) 263 dp1 = &((struct ufs1_dinode *)inodebuf)[n]; 264 else 265 dp2 = &((struct ufs2_dinode *)inodebuf)[n]; 266 if (inumber >= UFS_ROOTINO) { 267 if (printonly) 268 (void)printf("ino %ju gen %08x\n", 269 (uintmax_t)inumber, 270 sblock->fs_magic == FS_UFS1_MAGIC ? 271 dp1->di_gen : dp2->di_gen); 272 else if (sblock->fs_magic == FS_UFS1_MAGIC) 273 dp1->di_gen = random(); 274 else 275 dp2->di_gen = random(); 276 } 277 } 278 279 /* Write out modified inodes */ 280 if (!printonly) { 281 if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) { 282 warn("can't seek to %jd", 283 (intmax_t)dblk * bsize); 284 return (1); 285 } else if ((n = write(devfd, inodebuf, ibufsize)) != 286 ibufsize) { 287 warnx("can't write inodes: %s", 288 (n != ibufsize) ? "short write" : 289 strerror(errno)); 290 return (1); 291 } 292 } 293 } 294 (void)close(devfd); 295 296 return(0); 297 } 298 299 static void 300 usage(void) 301 { 302 (void)fprintf(stderr, 303 "usage: fsirand [-b] [-f] [-p] special [special ...]\n"); 304 exit(1); 305 } 306