sbin/fsirand/fsirand.c

   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  * $FreeBSD: src/sbin/fsirand/fsirand.c,v 1.7.2.1 2000/07/01 06:23:36 ps Exp $
  33  * $DragonFly: src/sbin/fsirand/fsirand.c,v 1.10 2007/05/20 23:21:36 dillon Exp $
  34  */
  35
  36 #include <sys/diskslice.h>
  37 #include <sys/param.h>
  38 #include <sys/time.h>
  39 #include <sys/resource.h>
  40
  41 #include <vfs/ufs/dinode.h>
  42 #include <vfs/ufs/fs.h>
  43
  44 #include <err.h>
  45 #include <errno.h>
  46 #include <fcntl.h>
  47 #include <stdio.h>
  48 #include <stdlib.h>
  49 #include <string.h>
  50 #include <unistd.h>
  51
  52 static void usage(void);
  53 int fsirand(char *);
  54
  55 int printonly = 0, force = 0, ignorelabel = 0;
  56
  57 int
  58 main(int argc, char **argv)
  59 {
  60         int n, ex = 0;
  61         struct rlimit rl;
  62
  63         while ((n = getopt(argc, argv, "bfp")) != -1) {
  64                 switch (n) {
  65                 case 'b':
  66                         ignorelabel++;
  67                         break;
  68                 case 'p':
  69                         printonly++;
  70                         break;
  71                 case 'f':
  72                         force++;
  73                         break;
  74                 default:
  75                         usage();
  76                 }
  77         }
  78         if (argc - optind < 1)
  79                 usage();
  80
  81         srandomdev();
  82
  83         /* Increase our data size to the max */
  84         if (getrlimit(RLIMIT_DATA, &rl) == 0) {
  85                 rl.rlim_cur = rl.rlim_max;
  86                 if (setrlimit(RLIMIT_DATA, &rl) < 0)
  87                         warn("can't get resource limit to max data size");
  88         } else
  89                 warn("can't get resource limit for data size");
  90
  91         for (n = optind; n < argc; n++) {
  92                 if (argc - optind != 1)
  93                         puts(argv[n]);
  94                 ex += fsirand(argv[n]);
  95                 if (n < argc - 1)
  96                         putchar('\n');
  97         }
  98
  99         exit(ex);
 100 }
 101
 102 int
 103 fsirand(char *device)
 104 {
 105         static struct ufs1_dinode *inodebuf;
 106         static ssize_t oldibufsize = 0;
 107         ssize_t ibufsize;
 108         struct fs *sblock;
 109         ino_t inumber, maxino;
 110         daddr_t dblk;
 111         char sbuf[SBSIZE], sbuftmp[SBSIZE];
 112         int devfd, n, cg;
 113         u_int32_t bsize = DEV_BSIZE;
 114
 115         if ((devfd = open(device, printonly ? O_RDONLY : O_RDWR)) < 0) {
 116                 warn("can't open %s", device);
 117                 return (1);
 118         }
 119
 120         /* Get block size (usually 512) from partinfo if possible */
 121         if (!ignorelabel) {
 122                 struct partinfo pinfo;
 123
 124                 if (ioctl(devfd, DIOCGPART, &pinfo) < 0) {
 125                         fprintf(stderr,
 126                              "can't read partition info, assuming sector "
 127                              "size of %d\n", bsize);
 128                 } else {
 129                         bsize = pinfo.media_blksize;
 130                 }
 131         }
 132
 133         /* Read in master superblock */
 134         memset(&sbuf, 0, sizeof(sbuf));
 135         sblock = (struct fs *)&sbuf;
 136         if (lseek(devfd, SBOFF, SEEK_SET) == -1) {
 137                 warn("can't seek to superblock (%qd) on %s", SBOFF, device);
 138                 return (1);
 139         }
 140         if ((n = read(devfd, (void *)sblock, SBSIZE)) != SBSIZE) {
 141                 warnx("can't read superblock on %s: %s", device,
 142                     (n < SBSIZE) ? "short read" : strerror(errno));
 143                 return (1);
 144         }
 145         maxino = sblock->fs_ncg * sblock->fs_ipg;
 146
 147         /* Simple sanity checks on the superblock */
 148         if (sblock->fs_magic != FS_MAGIC) {
 149                 warnx("bad magic number in superblock");
 150                 return (1);
 151         }
 152         if (sblock->fs_sbsize > SBSIZE) {
 153                 warnx("superblock size is preposterous");
 154                 return (1);
 155         }
 156         if (sblock->fs_postblformat == FS_42POSTBLFMT) {
 157                 warnx("filesystem format is too old, sorry");
 158                 return (1);
 159         }
 160         if (!force && !printonly && sblock->fs_clean != 1) {
 161                 warnx("filesystem is not clean, fsck %s first", device);
 162                 return (1);
 163         }
 164
 165         /* Make sure backup superblocks are sane. */
 166         sblock = (struct fs *)&sbuftmp;
 167         for (cg = 0; cg < sblock->fs_ncg; cg++) {
 168                 dblk = fsbtodb(sblock, cgsblock(sblock, cg));
 169                 if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) {
 170                         warn("can't seek to %qd", (off_t)dblk * bsize);
 171                         return (1);
 172                 } else if ((n = write(devfd, (void *)sblock, SBSIZE)) != SBSIZE) {
 173                         warn("can't read backup superblock %d on %s: %s",
 174                             cg + 1, device, (n < SBSIZE) ? "short write"
 175                             : strerror(errno));
 176                         return (1);
 177                 }
 178                 if (sblock->fs_magic != FS_MAGIC) {
 179                         warnx("bad magic number in backup superblock %d on %s",
 180                             cg + 1, device);
 181                         return (1);
 182                 }
 183                 if (sblock->fs_sbsize > SBSIZE) {
 184                         warnx("size of backup superblock %d on %s is preposterous",
 185                             cg + 1, device);
 186                         return (1);
 187                 }
 188         }
 189         sblock = (struct fs *)&sbuf;
 190
 191         /* XXX - should really cap buffer at 512kb or so */
 192         ibufsize = sizeof(struct ufs1_dinode) * sblock->fs_ipg;
 193         if (oldibufsize < ibufsize) {
 194                 if ((inodebuf = realloc(inodebuf, ibufsize)) == NULL)
 195                         errx(1, "can't allocate memory for inode buffer");
 196                 oldibufsize = ibufsize;
 197         }
 198
 199         if (printonly && (sblock->fs_id[0] || sblock->fs_id[1])) {
 200                 if (sblock->fs_inodefmt >= FS_44INODEFMT && sblock->fs_id[0])
 201                         printf("%s was randomized on %s", device,
 202                             ctime((const time_t *)&(sblock->fs_id[0])));
 203                 printf("fsid: %x %x\n", sblock->fs_id[0],
 204                     sblock->fs_id[1]);
 205         }
 206
 207         /* Randomize fs_id unless old 4.2BSD filesystem */
 208         if ((sblock->fs_inodefmt >= FS_44INODEFMT) && !printonly) {
 209                 /* Randomize fs_id and write out new sblock and backups */
 210                 sblock->fs_id[0] = (u_int32_t)time(NULL);
 211                 sblock->fs_id[1] = random();
 212
 213                 if (lseek(devfd, SBOFF, SEEK_SET) == -1) {
 214                         warn("can't seek to superblock (%qd) on %s", SBOFF,
 215                             device);
 216                         return (1);
 217                 }
 218                 if ((n = write(devfd, (void *)sblock, SBSIZE)) != SBSIZE) {
 219                         warn("can't read superblock on %s: %s", device,
 220                             (n < SBSIZE) ? "short write" : strerror(errno));
 221                         return (1);
 222                 }
 223         }
 224
 225         /* For each cylinder group, randomize inodes and update backup sblock */
 226         for (cg = 0, inumber = 0; cg < sblock->fs_ncg; cg++) {
 227                 /* Update superblock if appropriate */
 228                 if ((sblock->fs_inodefmt >= FS_44INODEFMT) && !printonly) {
 229                         dblk = fsbtodb(sblock, cgsblock(sblock, cg));
 230                         if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) {
 231                                 warn("can't seek to %qd", (off_t)dblk * bsize);
 232                                 return (1);
 233                         } else if ((n = write(devfd, (void *)sblock, SBSIZE)) != SBSIZE) {
 234                                 warn("can't read backup superblock %d on %s: %s",
 235                                     cg + 1, device, (n < SBSIZE) ? "short write"
 236                                     : strerror(errno));
 237                                 return (1);
 238                         }
 239                 }
 240
 241                 /* Read in inodes, then print or randomize generation nums */
 242                 dblk = fsbtodb(sblock, ino_to_fsba(sblock, inumber));
 243                 if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) {
 244                         warn("can't seek to %qd", (off_t)dblk * bsize);
 245                         return (1);
 246                 } else if ((n = read(devfd, inodebuf, ibufsize)) != ibufsize) {
 247                         warnx("can't read inodes: %s",
 248                              (n < ibufsize) ? "short read" : strerror(errno));
 249                         return (1);
 250                 }
 251
 252                 for (n = 0; n < sblock->fs_ipg; n++, inumber++) {
 253                         if (inumber >= ROOTINO) {
 254                                 if (printonly)
 255                                         printf("ino %lld gen %x\n", inumber,
 256                                             inodebuf[n].di_gen);
 257                                 else
 258                                         inodebuf[n].di_gen = random();
 259                         }
 260                 }
 261
 262                 /* Write out modified inodes */
 263                 if (!printonly) {
 264                         if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) {
 265                                 warn("can't seek to %qd",
 266                                     (off_t)dblk * bsize);
 267                                 return (1);
 268                         } else if ((n = write(devfd, inodebuf, ibufsize)) !=
 269                                  ibufsize) {
 270                                 warnx("can't write inodes: %s",
 271                                      (n != ibufsize) ? "short write" :
 272                                      strerror(errno));
 273                                 return (1);
 274                         }
 275                 }
 276         }
 277         close(devfd);
 278
 279         return(0);
 280 }
 281
 282 static void
 283 usage(void)
 284 {
 285         fprintf(stderr,
 286             "usage: fsirand [-b] [-f] [-p] special [special ...]\n");
 287         exit(1);
 288 }