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