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 1.7 2005/02/13 19:12:26 cpressey Exp $
  34  */
  35
  36 #include <sys/disklabel.h>
  37 #include <sys/param.h>
  38 #include <sys/time.h>
  39 #include <sys/resource.h>
  40
  41 #include <vfs/ufs/fs.h>
  42 #include <vfs/ufs/dinode.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 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         struct disklabel label;
 115
 116         if ((devfd = open(device, printonly ? O_RDONLY : O_RDWR)) < 0) {
 117                 warn("can't open %s", device);
 118                 return (1);
 119         }
 120
 121         /* Get block size (usually 512) from disklabel if possible */
 122         if (!ignorelabel) {
 123                 if (ioctl(devfd, DIOCGDINFO, &label) < 0)
 124                         warn("can't read disklabel, using sector size of %d",
 125                             bsize);
 126                 else
 127                         bsize = label.d_secsize;
 128         }
 129
 130         /* Read in master superblock */
 131         memset(&sbuf, 0, sizeof(sbuf));
 132         sblock = (struct fs *)&sbuf;
 133         if (lseek(devfd, SBOFF, SEEK_SET) == -1) {
 134                 warn("can't seek to superblock (%qd) on %s", SBOFF, device);
 135                 return (1);
 136         }
 137         if ((n = read(devfd, (void *)sblock, SBSIZE)) != SBSIZE) {
 138                 warnx("can't read superblock on %s: %s", device,
 139                     (n < SBSIZE) ? "short read" : strerror(errno));
 140                 return (1);
 141         }
 142         maxino = sblock->fs_ncg * sblock->fs_ipg;
 143
 144         /* Simple sanity checks on the superblock */
 145         if (sblock->fs_magic != FS_MAGIC) {
 146                 warnx("bad magic number in superblock");
 147                 return (1);
 148         }
 149         if (sblock->fs_sbsize > SBSIZE) {
 150                 warnx("superblock size is preposterous");
 151                 return (1);
 152         }
 153         if (sblock->fs_postblformat == FS_42POSTBLFMT) {
 154                 warnx("filesystem format is too old, sorry");
 155                 return (1);
 156         }
 157         if (!force && !printonly && sblock->fs_clean != 1) {
 158                 warnx("filesystem is not clean, fsck %s first", device);
 159                 return (1);
 160         }
 161
 162         /* Make sure backup superblocks are sane. */
 163         sblock = (struct fs *)&sbuftmp;
 164         for (cg = 0; cg < sblock->fs_ncg; cg++) {
 165                 dblk = fsbtodb(sblock, cgsblock(sblock, cg));
 166                 if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) {
 167                         warn("can't seek to %qd", (off_t)dblk * bsize);
 168                         return (1);
 169                 } else if ((n = write(devfd, (void *)sblock, SBSIZE)) != SBSIZE) {
 170                         warn("can't read backup superblock %d on %s: %s",
 171                             cg + 1, device, (n < SBSIZE) ? "short write"
 172                             : strerror(errno));
 173                         return (1);
 174                 }
 175                 if (sblock->fs_magic != FS_MAGIC) {
 176                         warnx("bad magic number in backup superblock %d on %s",
 177                             cg + 1, device);
 178                         return (1);
 179                 }
 180                 if (sblock->fs_sbsize > SBSIZE) {
 181                         warnx("size of backup superblock %d on %s is preposterous",
 182                             cg + 1, device);
 183                         return (1);
 184                 }
 185         }
 186         sblock = (struct fs *)&sbuf;
 187
 188         /* XXX - should really cap buffer at 512kb or so */
 189         ibufsize = sizeof(struct dinode) * sblock->fs_ipg;
 190         if (oldibufsize < ibufsize) {
 191                 if ((inodebuf = realloc(inodebuf, ibufsize)) == NULL)
 192                         errx(1, "can't allocate memory for inode buffer");
 193                 oldibufsize = ibufsize;
 194         }
 195
 196         if (printonly && (sblock->fs_id[0] || sblock->fs_id[1])) {
 197                 if (sblock->fs_inodefmt >= FS_44INODEFMT && sblock->fs_id[0])
 198                         printf("%s was randomized on %s", device,
 199                             ctime((const time_t *)&(sblock->fs_id[0])));
 200                 printf("fsid: %x %x\n", sblock->fs_id[0],
 201                     sblock->fs_id[1]);
 202         }
 203
 204         /* Randomize fs_id unless old 4.2BSD filesystem */
 205         if ((sblock->fs_inodefmt >= FS_44INODEFMT) && !printonly) {
 206                 /* Randomize fs_id and write out new sblock and backups */
 207                 sblock->fs_id[0] = (u_int32_t)time(NULL);
 208                 sblock->fs_id[1] = random();
 209
 210                 if (lseek(devfd, SBOFF, SEEK_SET) == -1) {
 211                         warn("can't seek to superblock (%qd) on %s", SBOFF,
 212                             device);
 213                         return (1);
 214                 }
 215                 if ((n = write(devfd, (void *)sblock, SBSIZE)) != SBSIZE) {
 216                         warn("can't read superblock on %s: %s", device,
 217                             (n < SBSIZE) ? "short write" : strerror(errno));
 218                         return (1);
 219                 }
 220         }
 221
 222         /* For each cylinder group, randomize inodes and update backup sblock */
 223         for (cg = 0, inumber = 0; cg < sblock->fs_ncg; cg++) {
 224                 /* Update superblock if appropriate */
 225                 if ((sblock->fs_inodefmt >= FS_44INODEFMT) && !printonly) {
 226                         dblk = fsbtodb(sblock, cgsblock(sblock, cg));
 227                         if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) {
 228                                 warn("can't seek to %qd", (off_t)dblk * bsize);
 229                                 return (1);
 230                         } else if ((n = write(devfd, (void *)sblock, SBSIZE)) != SBSIZE) {
 231                                 warn("can't read backup superblock %d on %s: %s",
 232                                     cg + 1, device, (n < SBSIZE) ? "short write"
 233                                     : strerror(errno));
 234                                 return (1);
 235                         }
 236                 }
 237
 238                 /* Read in inodes, then print or randomize generation nums */
 239                 dblk = fsbtodb(sblock, ino_to_fsba(sblock, inumber));
 240                 if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) {
 241                         warn("can't seek to %qd", (off_t)dblk * bsize);
 242                         return (1);
 243                 } else if ((n = read(devfd, inodebuf, ibufsize)) != ibufsize) {
 244                         warnx("can't read inodes: %s",
 245                              (n < ibufsize) ? "short read" : strerror(errno));
 246                         return (1);
 247                 }
 248
 249                 for (n = 0; n < sblock->fs_ipg; n++, inumber++) {
 250                         if (inumber >= ROOTINO) {
 251                                 if (printonly)
 252                                         printf("ino %d gen %x\n", inumber,
 253                                             inodebuf[n].di_gen);
 254                                 else
 255                                         inodebuf[n].di_gen = random();
 256                         }
 257                 }
 258
 259                 /* Write out modified inodes */
 260                 if (!printonly) {
 261                         if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) {
 262                                 warn("can't seek to %qd",
 263                                     (off_t)dblk * bsize);
 264                                 return (1);
 265                         } else if ((n = write(devfd, inodebuf, ibufsize)) !=
 266                                  ibufsize) {
 267                                 warnx("can't write inodes: %s",
 268                                      (n != ibufsize) ? "short write" :
 269                                      strerror(errno));
 270                                 return (1);
 271                         }
 272                 }
 273         }
 274         close(devfd);
 275
 276         return(0);
 277 }
 278
 279 static void
 280 usage(void)
 281 {
 282         fprintf(stderr,
 283             "usage: fsirand [-b] [-f] [-p] special [special ...]\n");
 284         exit(1);
 285 }