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/ffs/fs.h> 44 #include <ufs/ufs/dinode.h> 45 46 #include <err.h> 47 #include <errno.h> 48 #include <fcntl.h> 49 #include <stdio.h> 50 #include <stdlib.h> 51 #include <string.h> 52 #include <unistd.h> 53 54 static void usage(void) __dead2; 55 int fsirand(char *); 56 57 int printonly = 0, force = 0, ignorelabel = 0; 58 59 int 60 main(int argc, char *argv[]) 61 { 62 int n, ex = 0; 63 struct rlimit rl; 64 65 while ((n = getopt(argc, argv, "bfp")) != -1) { 66 switch (n) { 67 case 'b': 68 ignorelabel++; 69 break; 70 case 'p': 71 printonly++; 72 break; 73 case 'f': 74 force++; 75 break; 76 default: 77 usage(); 78 } 79 } 80 if (argc - optind < 1) 81 usage(); 82 83 srandomdev(); 84 85 /* Increase our data size to the max */ 86 if (getrlimit(RLIMIT_DATA, &rl) == 0) { 87 rl.rlim_cur = rl.rlim_max; 88 if (setrlimit(RLIMIT_DATA, &rl) < 0) 89 warn("can't get resource limit to max data size"); 90 } else 91 warn("can't get resource limit for data size"); 92 93 for (n = optind; n < argc; n++) { 94 if (argc - optind != 1) 95 (void)puts(argv[n]); 96 ex += fsirand(argv[n]); 97 if (n < argc - 1) 98 putchar('\n'); 99 } 100 101 exit(ex); 102 } 103 104 int 105 fsirand(char *device) 106 { 107 static struct dinode *inodebuf; 108 static size_t oldibufsize; 109 size_t ibufsize; 110 struct fs *sblock; 111 ino_t inumber, maxino; 112 daddr_t dblk; 113 char sbuf[SBSIZE], sbuftmp[SBSIZE]; 114 int devfd, n, cg; 115 u_int32_t bsize = DEV_BSIZE; 116 struct disklabel label; 117 118 if ((devfd = open(device, printonly ? O_RDONLY : O_RDWR)) < 0) { 119 warn("can't open %s", device); 120 return (1); 121 } 122 123 /* Get block size (usually 512) from disklabel if possible */ 124 if (!ignorelabel) { 125 if (ioctl(devfd, DIOCGDINFO, &label) < 0) 126 warn("can't read disklabel, using sector size of %d", 127 bsize); 128 else 129 bsize = label.d_secsize; 130 } 131 132 /* Read in master superblock */ 133 (void)memset(&sbuf, 0, sizeof(sbuf)); 134 sblock = (struct fs *)&sbuf; 135 if (lseek(devfd, SBOFF, SEEK_SET) == -1) { 136 warn("can't seek to superblock (%qd) on %s", SBOFF, device); 137 return (1); 138 } 139 if ((n = read(devfd, (void *)sblock, SBSIZE)) != SBSIZE) { 140 warnx("can't read superblock on %s: %s", device, 141 (n < SBSIZE) ? "short read" : strerror(errno)); 142 return (1); 143 } 144 maxino = sblock->fs_ncg * sblock->fs_ipg; 145 146 /* Simple sanity checks on the superblock */ 147 if (sblock->fs_magic != FS_MAGIC) { 148 warnx("bad magic number in superblock"); 149 return (1); 150 } 151 if (sblock->fs_sbsize > SBSIZE) { 152 warnx("superblock size is preposterous"); 153 return (1); 154 } 155 if (sblock->fs_postblformat == FS_42POSTBLFMT) { 156 warnx("filesystem format is too old, sorry"); 157 return (1); 158 } 159 if (!force && !printonly && sblock->fs_clean != 1) { 160 warnx("filesystem is not clean, fsck %s first", device); 161 return (1); 162 } 163 164 /* Make sure backup superblocks are sane. */ 165 sblock = (struct fs *)&sbuftmp; 166 for (cg = 0; cg < sblock->fs_ncg; cg++) { 167 dblk = fsbtodb(sblock, cgsblock(sblock, cg)); 168 if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) { 169 warn("can't seek to %qd", (off_t)dblk * bsize); 170 return (1); 171 } else if ((n = write(devfd, (void *)sblock, SBSIZE)) != SBSIZE) { 172 warn("can't read backup superblock %d on %s: %s", 173 cg + 1, device, (n < SBSIZE) ? "short write" 174 : strerror(errno)); 175 return (1); 176 } 177 if (sblock->fs_magic != FS_MAGIC) { 178 warnx("bad magic number in backup superblock %d on %s", 179 cg + 1, device); 180 return (1); 181 } 182 if (sblock->fs_sbsize > SBSIZE) { 183 warnx("size of backup superblock %d on %s is preposterous", 184 cg + 1, device); 185 return (1); 186 } 187 } 188 sblock = (struct fs *)&sbuf; 189 190 /* XXX - should really cap buffer at 512kb or so */ 191 ibufsize = sizeof(struct dinode) * sblock->fs_ipg; 192 if (oldibufsize < ibufsize) { 193 if ((inodebuf = realloc(inodebuf, ibufsize)) == NULL) 194 errx(1, "can't allocate memory for inode buffer"); 195 oldibufsize = ibufsize; 196 } 197 198 if (printonly && (sblock->fs_id[0] || sblock->fs_id[1])) { 199 if (sblock->fs_inodefmt >= FS_44INODEFMT && sblock->fs_id[0]) 200 (void)printf("%s was randomized on %s", device, 201 ctime((const time_t *)&(sblock->fs_id[0]))); 202 (void)printf("fsid: %x %x\n", sblock->fs_id[0], 203 sblock->fs_id[1]); 204 } 205 206 /* Randomize fs_id unless old 4.2BSD filesystem */ 207 if ((sblock->fs_inodefmt >= FS_44INODEFMT) && !printonly) { 208 /* Randomize fs_id and write out new sblock and backups */ 209 sblock->fs_id[0] = (u_int32_t)time(NULL); 210 sblock->fs_id[1] = random(); 211 212 if (lseek(devfd, SBOFF, SEEK_SET) == -1) { 213 warn("can't seek to superblock (%qd) on %s", SBOFF, 214 device); 215 return (1); 216 } 217 if ((n = write(devfd, (void *)sblock, SBSIZE)) != SBSIZE) { 218 warn("can't read superblock on %s: %s", device, 219 (n < SBSIZE) ? "short write" : strerror(errno)); 220 return (1); 221 } 222 } 223 224 /* For each cylinder group, randomize inodes and update backup sblock */ 225 for (cg = 0, inumber = 0; cg < sblock->fs_ncg; cg++) { 226 /* Update superblock if appropriate */ 227 if ((sblock->fs_inodefmt >= FS_44INODEFMT) && !printonly) { 228 dblk = fsbtodb(sblock, cgsblock(sblock, cg)); 229 if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) { 230 warn("can't seek to %qd", (off_t)dblk * bsize); 231 return (1); 232 } else if ((n = write(devfd, (void *)sblock, SBSIZE)) != SBSIZE) { 233 warn("can't read backup superblock %d on %s: %s", 234 cg + 1, device, (n < SBSIZE) ? "short write" 235 : strerror(errno)); 236 return (1); 237 } 238 } 239 240 /* Read in inodes, then print or randomize generation nums */ 241 dblk = fsbtodb(sblock, ino_to_fsba(sblock, inumber)); 242 if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) { 243 warn("can't seek to %qd", (off_t)dblk * bsize); 244 return (1); 245 } else if ((n = read(devfd, inodebuf, ibufsize)) != ibufsize) { 246 warnx("can't read inodes: %s", 247 (n < ibufsize) ? "short read" : strerror(errno)); 248 return (1); 249 } 250 251 for (n = 0; n < sblock->fs_ipg; n++, inumber++) { 252 if (inumber >= ROOTINO) { 253 if (printonly) 254 (void)printf("ino %d gen %x\n", inumber, 255 inodebuf[n].di_gen); 256 else 257 inodebuf[n].di_gen = random(); 258 } 259 } 260 261 /* Write out modified inodes */ 262 if (!printonly) { 263 if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) { 264 warn("can't seek to %qd", 265 (off_t)dblk * bsize); 266 return (1); 267 } else if ((n = write(devfd, inodebuf, ibufsize)) != 268 ibufsize) { 269 warnx("can't write inodes: %s", 270 (n != ibufsize) ? "short write" : 271 strerror(errno)); 272 return (1); 273 } 274 } 275 } 276 (void)close(devfd); 277 278 return(0); 279 } 280 281 static void 282 usage(void) 283 { 284 (void)fprintf(stderr, 285 "usage: fsirand [-b] [-f] [-p] special [special ...]\n"); 286 exit(1); 287 } 288