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/disklabel.h> 39 #include <sys/param.h> 40 #include <sys/time.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 <unistd.h> 54 55 static void usage(void) __dead2; 56 int fsirand(char *); 57 58 /* 59 * Possible superblock locations ordered from most to least likely. 60 */ 61 static int sblock_try[] = SBLOCKSEARCH; 62 63 int printonly = 0, force = 0, ignorelabel = 0; 64 65 int 66 main(int argc, char *argv[]) 67 { 68 int n, ex = 0; 69 struct rlimit rl; 70 71 while ((n = getopt(argc, argv, "bfp")) != -1) { 72 switch (n) { 73 case 'b': 74 ignorelabel++; 75 break; 76 case 'p': 77 printonly++; 78 break; 79 case 'f': 80 force++; 81 break; 82 default: 83 usage(); 84 } 85 } 86 if (argc - optind < 1) 87 usage(); 88 89 srandomdev(); 90 91 /* Increase our data size to the max */ 92 if (getrlimit(RLIMIT_DATA, &rl) == 0) { 93 rl.rlim_cur = rl.rlim_max; 94 if (setrlimit(RLIMIT_DATA, &rl) < 0) 95 warn("can't get resource limit to max data size"); 96 } else 97 warn("can't get resource limit for data size"); 98 99 for (n = optind; n < argc; n++) { 100 if (argc - optind != 1) 101 (void)puts(argv[n]); 102 ex += fsirand(argv[n]); 103 if (n < argc - 1) 104 putchar('\n'); 105 } 106 107 exit(ex); 108 } 109 110 int 111 fsirand(char *device) 112 { 113 struct ufs1_dinode *dp1; 114 struct ufs2_dinode *dp2; 115 caddr_t inodebuf; 116 ssize_t ibufsize; 117 struct fs *sblock; 118 ino_t inumber, maxino; 119 ufs2_daddr_t sblockloc, dblk; 120 char sbuf[SBLOCKSIZE], sbuftmp[SBLOCKSIZE]; 121 int i, devfd, n, cg; 122 u_int32_t bsize = DEV_BSIZE; 123 struct disklabel label; 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 /* Get block size (usually 512) from disklabel if possible */ 131 if (!ignorelabel) { 132 if (ioctl(devfd, DIOCGDINFO, &label) < 0) 133 warn("can't read disklabel, using sector size of %d", 134 bsize); 135 else 136 bsize = label.d_secsize; 137 } 138 139 dp1 = NULL; 140 dp2 = NULL; 141 142 /* Read in master superblock */ 143 (void)memset(&sbuf, 0, sizeof(sbuf)); 144 sblock = (struct fs *)&sbuf; 145 for (i = 0; sblock_try[i] != -1; i++) { 146 sblockloc = sblock_try[i]; 147 if (lseek(devfd, sblockloc, SEEK_SET) == -1) { 148 warn("can't seek to superblock (%jd) on %s", 149 (intmax_t)sblockloc, device); 150 return (1); 151 } 152 if ((n = read(devfd, (void *)sblock, SBLOCKSIZE))!=SBLOCKSIZE) { 153 warnx("can't read superblock on %s: %s", device, 154 (n < SBLOCKSIZE) ? "short read" : strerror(errno)); 155 return (1); 156 } 157 if ((sblock->fs_magic == FS_UFS1_MAGIC || 158 (sblock->fs_magic == FS_UFS2_MAGIC && 159 sblock->fs_sblockloc == sblock_try[i])) && 160 sblock->fs_bsize <= MAXBSIZE && 161 sblock->fs_bsize >= (ssize_t)sizeof(struct fs)) 162 break; 163 } 164 if (sblock_try[i] == -1) { 165 fprintf(stderr, "Cannot find file system superblock\n"); 166 return (1); 167 } 168 maxino = sblock->fs_ncg * sblock->fs_ipg; 169 170 if (sblock->fs_magic == FS_UFS1_MAGIC && 171 sblock->fs_old_inodefmt < FS_44INODEFMT) { 172 warnx("file system format is too old, sorry"); 173 return (1); 174 } 175 if (!force && !printonly && sblock->fs_clean != 1) { 176 warnx("file system is not clean, fsck %s first", device); 177 return (1); 178 } 179 180 /* Make sure backup superblocks are sane. */ 181 sblock = (struct fs *)&sbuftmp; 182 for (cg = 0; cg < (int)sblock->fs_ncg; cg++) { 183 dblk = fsbtodb(sblock, cgsblock(sblock, cg)); 184 if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) { 185 warn("can't seek to %jd", (intmax_t)dblk * bsize); 186 return (1); 187 } else if ((n = write(devfd, (void *)sblock, SBLOCKSIZE)) != SBLOCKSIZE) { 188 warn("can't read backup superblock %d on %s: %s", 189 cg + 1, device, (n < SBLOCKSIZE) ? "short write" 190 : strerror(errno)); 191 return (1); 192 } 193 if (sblock->fs_magic != FS_UFS1_MAGIC && 194 sblock->fs_magic != FS_UFS2_MAGIC) { 195 warnx("bad magic number in backup superblock %d on %s", 196 cg + 1, device); 197 return (1); 198 } 199 if (sblock->fs_sbsize > SBLOCKSIZE) { 200 warnx("size of backup superblock %d on %s is preposterous", 201 cg + 1, device); 202 return (1); 203 } 204 } 205 sblock = (struct fs *)&sbuf; 206 207 /* XXX - should really cap buffer at 512kb or so */ 208 if (sblock->fs_magic == FS_UFS1_MAGIC) 209 ibufsize = sizeof(struct ufs1_dinode) * sblock->fs_ipg; 210 else 211 ibufsize = sizeof(struct ufs2_dinode) * sblock->fs_ipg; 212 if ((inodebuf = malloc(ibufsize)) == NULL) 213 errx(1, "can't allocate memory for inode buffer"); 214 215 if (printonly && (sblock->fs_id[0] || sblock->fs_id[1])) { 216 if (sblock->fs_id[0]) 217 (void)printf("%s was randomized on %s", device, 218 ctime((void *)&(sblock->fs_id[0]))); 219 (void)printf("fsid: %x %x\n", sblock->fs_id[0], 220 sblock->fs_id[1]); 221 } 222 223 /* Randomize fs_id unless old 4.2BSD file system */ 224 if (!printonly) { 225 /* Randomize fs_id and write out new sblock and backups */ 226 sblock->fs_id[0] = (u_int32_t)time(NULL); 227 sblock->fs_id[1] = random(); 228 229 if (lseek(devfd, sblockloc, SEEK_SET) == -1) { 230 warn("can't seek to superblock (%jd) on %s", 231 (intmax_t)sblockloc, device); 232 return (1); 233 } 234 if ((n = write(devfd, (void *)sblock, SBLOCKSIZE)) != 235 SBLOCKSIZE) { 236 warn("can't write superblock on %s: %s", device, 237 (n < SBLOCKSIZE) ? "short write" : strerror(errno)); 238 return (1); 239 } 240 } 241 242 /* For each cylinder group, randomize inodes and update backup sblock */ 243 for (cg = 0, inumber = 0; cg < (int)sblock->fs_ncg; cg++) { 244 /* Update superblock if appropriate */ 245 if (!printonly) { 246 dblk = fsbtodb(sblock, cgsblock(sblock, cg)); 247 if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) { 248 warn("can't seek to %jd", 249 (intmax_t)dblk * bsize); 250 return (1); 251 } else if ((n = write(devfd, (void *)sblock, 252 SBLOCKSIZE)) != SBLOCKSIZE) { 253 warn("can't write backup superblock %d on %s: %s", 254 cg + 1, device, (n < SBLOCKSIZE) ? 255 "short write" : strerror(errno)); 256 return (1); 257 } 258 } 259 260 /* Read in inodes, then print or randomize generation nums */ 261 dblk = fsbtodb(sblock, ino_to_fsba(sblock, inumber)); 262 if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) { 263 warn("can't seek to %jd", (intmax_t)dblk * bsize); 264 return (1); 265 } else if ((n = read(devfd, inodebuf, ibufsize)) != ibufsize) { 266 warnx("can't read inodes: %s", 267 (n < ibufsize) ? "short read" : strerror(errno)); 268 return (1); 269 } 270 271 for (n = 0; n < (int)sblock->fs_ipg; n++, inumber++) { 272 if (sblock->fs_magic == FS_UFS1_MAGIC) 273 dp1 = &((struct ufs1_dinode *)inodebuf)[n]; 274 else 275 dp2 = &((struct ufs2_dinode *)inodebuf)[n]; 276 if (inumber >= ROOTINO) { 277 if (printonly) 278 (void)printf("ino %d gen %08x\n", 279 inumber, 280 sblock->fs_magic == FS_UFS1_MAGIC ? 281 dp1->di_gen : dp2->di_gen); 282 else if (sblock->fs_magic == FS_UFS1_MAGIC) 283 dp1->di_gen = random(); 284 else 285 dp2->di_gen = random(); 286 } 287 } 288 289 /* Write out modified inodes */ 290 if (!printonly) { 291 if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) { 292 warn("can't seek to %jd", 293 (intmax_t)dblk * bsize); 294 return (1); 295 } else if ((n = write(devfd, inodebuf, ibufsize)) != 296 ibufsize) { 297 warnx("can't write inodes: %s", 298 (n != ibufsize) ? "short write" : 299 strerror(errno)); 300 return (1); 301 } 302 } 303 } 304 (void)close(devfd); 305 306 return(0); 307 } 308 309 static void 310 usage(void) 311 { 312 (void)fprintf(stderr, 313 "usage: fsirand [-b] [-f] [-p] special [special ...]\n"); 314 exit(1); 315 } 316