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/types.h> 39 #include <sys/disklabel.h> 40 #include <sys/param.h> 41 #include <sys/time.h> 42 #include <sys/resource.h> 43 44 #include <ufs/ffs/fs.h> 45 #include <ufs/ufs/dinode.h> 46 47 #include <err.h> 48 #include <errno.h> 49 #include <fcntl.h> 50 #include <stdio.h> 51 #include <stdlib.h> 52 #include <string.h> 53 #include <unistd.h> 54 55 static void usage __P((void)); 56 int fsirand __P((char *)); 57 58 int printonly = 0, force = 0, ignorelabel = 0; 59 60 int 61 main(argc, argv) 62 int argc; 63 char *argv[]; 64 { 65 int n, ex = 0; 66 struct rlimit rl; 67 68 while ((n = getopt(argc, argv, "bfp")) != -1) { 69 switch (n) { 70 case 'b': 71 ignorelabel++; 72 break; 73 case 'p': 74 printonly++; 75 break; 76 case 'f': 77 force++; 78 break; 79 default: 80 usage(); 81 } 82 } 83 if (argc - optind < 1) 84 usage(); 85 86 srandomdev(); 87 88 /* Increase our data size to the max */ 89 if (getrlimit(RLIMIT_DATA, &rl) == 0) { 90 rl.rlim_cur = rl.rlim_max; 91 if (setrlimit(RLIMIT_DATA, &rl) < 0) 92 warn("can't get resource limit to max data size"); 93 } else 94 warn("can't get resource limit for data size"); 95 96 for (n = optind; n < argc; n++) { 97 if (argc - optind != 1) 98 (void)puts(argv[n]); 99 ex += fsirand(argv[n]); 100 if (n < argc - 1) 101 putchar('\n'); 102 } 103 104 exit(ex); 105 } 106 107 int 108 fsirand(device) 109 char *device; 110 { 111 static struct dinode *inodebuf; 112 static size_t oldibufsize; 113 size_t ibufsize; 114 struct fs *sblock; 115 ino_t inumber, maxino; 116 daddr_t dblk; 117 char sbuf[SBSIZE], sbuftmp[SBSIZE]; 118 int devfd, n, cg; 119 u_int32_t bsize = DEV_BSIZE; 120 struct disklabel label; 121 122 if ((devfd = open(device, printonly ? O_RDONLY : O_RDWR)) < 0) { 123 warn("can't open %s", device); 124 return (1); 125 } 126 127 /* Get block size (usually 512) from disklabel if possible */ 128 if (!ignorelabel) { 129 if (ioctl(devfd, DIOCGDINFO, &label) < 0) 130 warn("can't read disklabel, using sector size of %d", 131 bsize); 132 else 133 bsize = label.d_secsize; 134 } 135 136 /* Read in master superblock */ 137 (void)memset(&sbuf, 0, sizeof(sbuf)); 138 sblock = (struct fs *)&sbuf; 139 if (lseek(devfd, SBOFF, SEEK_SET) == -1) { 140 warn("can't seek to superblock (%qd) on %s", SBOFF, device); 141 return (1); 142 } 143 if ((n = read(devfd, (void *)sblock, SBSIZE)) != SBSIZE) { 144 warnx("can't read superblock on %s: %s", device, 145 (n < SBSIZE) ? "short read" : strerror(errno)); 146 return (1); 147 } 148 maxino = sblock->fs_ncg * sblock->fs_ipg; 149 150 /* Simple sanity checks on the superblock */ 151 if (sblock->fs_magic != FS_MAGIC) { 152 warnx("bad magic number in superblock"); 153 return (1); 154 } 155 if (sblock->fs_sbsize > SBSIZE) { 156 warnx("superblock size is preposterous"); 157 return (1); 158 } 159 if (sblock->fs_postblformat == FS_42POSTBLFMT) { 160 warnx("filesystem format is too old, sorry"); 161 return (1); 162 } 163 if (!force && !printonly && sblock->fs_clean != 1) { 164 warnx("filesystem 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 < 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 %qd", (off_t)dblk * bsize); 174 return (1); 175 } else if ((n = write(devfd, (void *)sblock, SBSIZE)) != SBSIZE) { 176 warn("can't read backup superblock %d on %s: %s", 177 cg + 1, device, (n < SBSIZE) ? "short write" 178 : strerror(errno)); 179 return (1); 180 } 181 if (sblock->fs_magic != FS_MAGIC) { 182 warnx("bad magic number in backup superblock %d on %s", 183 cg + 1, device); 184 return (1); 185 } 186 if (sblock->fs_sbsize > SBSIZE) { 187 warnx("size of backup superblock %d on %s is preposterous", 188 cg + 1, device); 189 return (1); 190 } 191 } 192 sblock = (struct fs *)&sbuf; 193 194 /* XXX - should really cap buffer at 512kb or so */ 195 ibufsize = sizeof(struct dinode) * sblock->fs_ipg; 196 if (oldibufsize < ibufsize) { 197 if ((inodebuf = realloc(inodebuf, ibufsize)) == NULL) 198 errx(1, "can't allocate memory for inode buffer"); 199 oldibufsize = ibufsize; 200 } 201 202 if (printonly && (sblock->fs_id[0] || sblock->fs_id[1])) { 203 if (sblock->fs_inodefmt >= FS_44INODEFMT && sblock->fs_id[0]) 204 (void)printf("%s was randomized on %s", device, 205 ctime((const time_t *)&(sblock->fs_id[0]))); 206 (void)printf("fsid: %x %x\n", sblock->fs_id[0], 207 sblock->fs_id[1]); 208 } 209 210 /* Randomize fs_id unless old 4.2BSD filesystem */ 211 if ((sblock->fs_inodefmt >= FS_44INODEFMT) && !printonly) { 212 /* Randomize fs_id and write out new sblock and backups */ 213 sblock->fs_id[0] = (u_int32_t)time(NULL); 214 sblock->fs_id[1] = random(); 215 216 if (lseek(devfd, SBOFF, SEEK_SET) == -1) { 217 warn("can't seek to superblock (%qd) on %s", SBOFF, 218 device); 219 return (1); 220 } 221 if ((n = write(devfd, (void *)sblock, SBSIZE)) != SBSIZE) { 222 warn("can't read superblock on %s: %s", device, 223 (n < SBSIZE) ? "short write" : strerror(errno)); 224 return (1); 225 } 226 } 227 228 /* For each cylinder group, randomize inodes and update backup sblock */ 229 for (cg = 0, inumber = 0; cg < sblock->fs_ncg; cg++) { 230 /* Update superblock if appropriate */ 231 if ((sblock->fs_inodefmt >= FS_44INODEFMT) && !printonly) { 232 dblk = fsbtodb(sblock, cgsblock(sblock, cg)); 233 if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) { 234 warn("can't seek to %qd", (off_t)dblk * bsize); 235 return (1); 236 } else if ((n = write(devfd, (void *)sblock, SBSIZE)) != SBSIZE) { 237 warn("can't read backup superblock %d on %s: %s", 238 cg + 1, device, (n < SBSIZE) ? "short write" 239 : strerror(errno)); 240 return (1); 241 } 242 } 243 244 /* Read in inodes, then print or randomize generation nums */ 245 dblk = fsbtodb(sblock, ino_to_fsba(sblock, inumber)); 246 if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) { 247 warn("can't seek to %qd", (off_t)dblk * bsize); 248 return (1); 249 } else if ((n = read(devfd, inodebuf, ibufsize)) != ibufsize) { 250 warnx("can't read inodes: %s", 251 (n < ibufsize) ? "short read" : strerror(errno)); 252 return (1); 253 } 254 255 for (n = 0; n < sblock->fs_ipg; n++, inumber++) { 256 if (inumber >= ROOTINO) { 257 if (printonly) 258 (void)printf("ino %d gen %x\n", inumber, 259 inodebuf[n].di_gen); 260 else 261 inodebuf[n].di_gen = random(); 262 } 263 } 264 265 /* Write out modified inodes */ 266 if (!printonly) { 267 if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) { 268 warn("can't seek to %qd", 269 (off_t)dblk * bsize); 270 return (1); 271 } else if ((n = write(devfd, inodebuf, ibufsize)) != 272 ibufsize) { 273 warnx("can't write inodes: %s", 274 (n != ibufsize) ? "short write" : 275 strerror(errno)); 276 return (1); 277 } 278 } 279 } 280 (void)close(devfd); 281 282 return(0); 283 } 284 285 static void 286 usage() 287 { 288 (void)fprintf(stderr, 289 "usage: fsirand [-b] [-f] [-p] special [special ...]\n"); 290 exit(1); 291 } 292