usr/src/cmd/fs.d/ufs/fsirand/fsirand.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 /*      Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T     */
  28 /*        All Rights Reserved   */
  29
  30 /*
  31  * Portions of this source code were derived from Berkeley 4.3 BSD
  32  * under license from the Regents of the University of California.
  33  */
  34
  35 #pragma ident   "%Z%%M% %I%     %E% SMI"
  36
  37 /*
  38  * fsirand installs random inode generation numbers on all the inodes on
  39  * device <special>, and also installs a file system ID in the superblock.
  40  * This helps increase the security of  file systems exported by NFS.
  41  */
  42
  43 #include <fcntl.h>
  44 #include <stdio.h>
  45 #include <errno.h>
  46 #include <strings.h>
  47 #include <unistd.h>
  48 #include <stdlib.h>
  49 #include <sys/param.h>
  50 #include <sys/types.h>
  51 #include <sys/time.h>
  52 #include <sys/fs/ufs_fs.h>
  53 #include <sys/vnode.h>
  54 #include <sys/fs/ufs_inode.h>
  55
  56 long fsbuf[(SBSIZE / sizeof (long))];
  57 struct dinode dibuf[8192/sizeof (struct dinode)];
  58
  59 int
  60 main(int argc, char *argv[])
  61 {
  62         struct fs *fs;
  63         int fd;
  64         char *dev;
  65         int bno;
  66         struct dinode *dip;
  67         int inum, imax;
  68         int i, n;
  69         offset_t seekaddr;
  70         int bsize;
  71         int pflag = 0;
  72         struct timeval timeval;
  73
  74         argv++;
  75         argc--;
  76         if (argc > 0 && strcmp(*argv, "-p") == 0) {
  77                 pflag++;
  78                 argv++;
  79                 argc--;
  80         }
  81         if (argc <= 0) {
  82                 (void) fprintf(stderr, "Usage: fsirand [-p] special\n");
  83                 exit(1);
  84         }
  85         dev = *argv;
  86         fd = open64(dev, pflag ? O_RDONLY : O_RDWR);
  87         if (fd == -1) {
  88                 (void) fprintf(stderr, "fsirand: Cannot open %s: %s\n", dev,
  89                     strerror(errno));
  90                 exit(1);
  91         }
  92         if (llseek(fd, (offset_t)SBLOCK * DEV_BSIZE, 0) == -1) {
  93                 (void) fprintf(stderr,
  94                     "fsirand: Seek to superblock failed: %s\n",
  95                     strerror(errno));
  96                 exit(1);
  97         }
  98         fs = (struct fs *)fsbuf;
  99         if ((n = read(fd, (char *)fs, SBSIZE)) != SBSIZE) {
 100                 (void) fprintf(stderr,
 101                     "fsirand: Read of superblock failed: %s\n",
 102                     n == -1 ? strerror(errno) : "Short read");
 103                 exit(1);
 104         }
 105         if ((fs->fs_magic != FS_MAGIC) &&
 106             (fs->fs_magic != MTB_UFS_MAGIC)) {
 107                 (void) fprintf(stderr,
 108         "fsirand: Not a file system (bad magic number in superblock)\n");
 109                 exit(1);
 110         }
 111         if (fs->fs_magic == FS_MAGIC &&
 112             (fs->fs_version != UFS_EFISTYLE4NONEFI_VERSION_2 &&
 113             fs->fs_version != UFS_VERSION_MIN)) {
 114                 (void) fprintf(stderr,
 115         "fsirand: Unrecognized UFS format version number %d (in superblock)\n",
 116                     fs->fs_version);
 117                 exit(1);
 118         }
 119         if (fs->fs_magic == MTB_UFS_MAGIC &&
 120             (fs->fs_version > MTB_UFS_VERSION_1 ||
 121             fs->fs_version < MTB_UFS_VERSION_MIN)) {
 122                 (void) fprintf(stderr,
 123         "fsirand: Unrecognized UFS format version number %d (in superblock)\n",
 124                     fs->fs_version);
 125                 exit(1);
 126         }
 127         if (pflag) {
 128                 (void) printf("fsid: %x %x\n", fs->fs_id[0], fs->fs_id[1]);
 129         } else {
 130                 n = getpid();
 131                 (void) gettimeofday(&timeval, (struct timezone *)NULL);
 132                 srand48((long)(timeval.tv_sec + timeval.tv_usec + n));
 133         }
 134         bsize = INOPB(fs) * sizeof (struct dinode);
 135         inum = 0;
 136         imax = fs->fs_ipg * fs->fs_ncg;
 137         while (inum < imax) {
 138                 bno = itod(fs, inum);
 139                 seekaddr = (offset_t)fsbtodb(fs, bno) * DEV_BSIZE;
 140                 if (llseek(fd, seekaddr, 0) == -1) {
 141                         (void) fprintf(stderr,
 142                             "fsirand: Seek to %ld %ld failed: %s\n",
 143                             ((off_t *)&seekaddr)[0], ((off_t *)&seekaddr)[1],
 144                             strerror(errno));
 145                         exit(1);
 146                 }
 147                 n = read(fd, (char *)dibuf, bsize);
 148                 if (n != bsize) {
 149                         (void) fprintf(stderr,
 150                             "fsirand: Read of ilist block failed: %s\n",
 151                             n == -1 ? strerror(errno) : "Short read");
 152                         exit(1);
 153                 }
 154                 for (dip = dibuf; dip < &dibuf[INOPB(fs)]; dip++) {
 155                         if (pflag) {
 156                                 (void) printf("ino %d gen %x\n", inum,
 157                                     dip->di_gen);
 158                         } else {
 159                                 dip->di_gen = lrand48();
 160                         }
 161                         inum++;
 162                 }
 163                 if (!pflag) {
 164                         if (llseek(fd, seekaddr, 0) == -1) {
 165                                 (void) fprintf(stderr,
 166                                     "fsirand: Seek to %ld %ld failed: %s\n",
 167                                     ((off_t *)&seekaddr)[0],
 168                                     ((off_t *)&seekaddr)[1],
 169                                     strerror(errno));
 170                                 exit(1);
 171                         }
 172                         n = write(fd, (char *)dibuf, bsize);
 173                         if (n != bsize) {
 174                                 (void) fprintf(stderr,
 175                                 "fsirand: Write of ilist block failed: %s\n",
 176                                     n == -1 ? strerror(errno) : "Short write");
 177                                 exit(1);
 178                         }
 179                 }
 180         }
 181         if (!pflag) {
 182                 (void) gettimeofday(&timeval, (struct timezone *)NULL);
 183                 fs->fs_id[0] = timeval.tv_sec;
 184                 fs->fs_id[1] = timeval.tv_usec + getpid();
 185                 if (llseek(fd, (offset_t)SBLOCK * DEV_BSIZE, 0) == -1) {
 186                         (void) fprintf(stderr,
 187                             "fsirand: Seek to superblock failed: %s\n",
 188                             strerror(errno));
 189                         exit(1);
 190                 }
 191                 if ((n = write(fd, (char *)fs, SBSIZE)) != SBSIZE) {
 192                         (void) fprintf(stderr,
 193                             "fsirand: Write of superblock failed: %s\n",
 194                             n == -1 ? strerror(errno) : "Short write");
 195                         exit(1);
 196                 }
 197         }
 198         for (i = 0; i < fs->fs_ncg; i++) {
 199                 seekaddr = (offset_t)fsbtodb(fs, cgsblock(fs, i)) * DEV_BSIZE;
 200                 if (llseek(fd,  seekaddr, 0) == -1) {
 201                         (void) fprintf(stderr,
 202                         "fsirand: Seek to alternate superblock failed: %s\n",
 203                             strerror(errno));
 204                         exit(1);
 205                 }
 206                 if (pflag) {
 207                         if ((n = read(fd, (char *)fs, SBSIZE)) != SBSIZE) {
 208                                 (void) fprintf(stderr,
 209                         "fsirand: Read of alternate superblock failed: %s\n",
 210                                     n == -1 ? strerror(errno) : "Short read");
 211                                 exit(1);
 212                         }
 213                         if ((fs->fs_magic != FS_MAGIC) &&
 214                             (fs->fs_magic != MTB_UFS_MAGIC)) {
 215                                 (void) fprintf(stderr,
 216                                     "fsirand: Not a valid file system (bad "
 217                                     "magic number in alternate superblock)\n");
 218                                 exit(1);
 219                         }
 220                 } else {
 221                         if ((n = write(fd, (char *)fs, SBSIZE)) != SBSIZE) {
 222                                 (void) fprintf(stderr,
 223                         "fsirand: Write of alternate superblock failed: %s\n",
 224                                     n == -1 ? strerror(errno) : "Short write");
 225                                 exit(1);
 226                         }
 227                 }
 228         }
 229         return (0);
 230 }