1 /* $OpenBSD: fsirand.c,v 1.9 1997/02/28 00:46:33 millert Exp $ */ 2 3 /*- 4 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 5 * 6 * Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com> 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by Todd C. Miller. 20 * 4. The name of the author may not be used to endorse or promote products 21 * derived from this software without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, 24 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY 25 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 26 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 27 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 28 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 29 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 30 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 31 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 32 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 33 */ 34 35 #ifndef lint 36 static const char rcsid[] = 37 "$FreeBSD$"; 38 #endif /* not lint */ 39 40 #include <sys/param.h> 41 #include <sys/resource.h> 42 43 #include <ufs/ufs/dinode.h> 44 #include <ufs/ffs/fs.h> 45 46 #include <err.h> 47 #include <errno.h> 48 #include <fcntl.h> 49 #include <libufs.h> 50 #include <stdio.h> 51 #include <stdint.h> 52 #include <stdlib.h> 53 #include <string.h> 54 #include <time.h> 55 #include <unistd.h> 56 57 static void usage(void) __dead2; 58 int fsirand(char *); 59 60 static int printonly = 0, force = 0, ignorelabel = 0; 61 62 int 63 main(int argc, 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(char *device) 109 { 110 struct ufs1_dinode *dp1; 111 struct ufs2_dinode *dp2; 112 caddr_t inodebuf; 113 ssize_t ibufsize; 114 struct fs *sblock; 115 ino_t inumber; 116 ufs2_daddr_t dblk; 117 int devfd, n, cg, ret; 118 u_int32_t bsize = DEV_BSIZE; 119 120 if ((devfd = open(device, printonly ? O_RDONLY : O_RDWR)) < 0) { 121 warn("can't open %s", device); 122 return (1); 123 } 124 125 dp1 = NULL; 126 dp2 = NULL; 127 128 /* Read in master superblock */ 129 if ((ret = sbget(devfd, &sblock, STDSB)) != 0) { 130 switch (ret) { 131 case ENOENT: 132 warn("Cannot find file system superblock"); 133 return (1); 134 default: 135 warn("Unable to read file system superblock"); 136 return (1); 137 } 138 } 139 140 if (sblock->fs_magic == FS_UFS1_MAGIC && 141 sblock->fs_old_inodefmt < FS_44INODEFMT) { 142 warnx("file system format is too old, sorry"); 143 return (1); 144 } 145 if (!force && !printonly && sblock->fs_clean != 1) { 146 warnx("file system is not clean, fsck %s first", device); 147 return (1); 148 } 149 150 /* XXX - should really cap buffer at 512kb or so */ 151 if (sblock->fs_magic == FS_UFS1_MAGIC) 152 ibufsize = sizeof(struct ufs1_dinode) * sblock->fs_ipg; 153 else 154 ibufsize = sizeof(struct ufs2_dinode) * sblock->fs_ipg; 155 if ((inodebuf = malloc(ibufsize)) == NULL) 156 errx(1, "can't allocate memory for inode buffer"); 157 158 if (printonly && (sblock->fs_id[0] || sblock->fs_id[1])) { 159 if (sblock->fs_id[0]) 160 (void)printf("%s was randomized on %s", device, 161 ctime((void *)&(sblock->fs_id[0]))); 162 (void)printf("fsid: %x %x\n", sblock->fs_id[0], 163 sblock->fs_id[1]); 164 } 165 166 /* Randomize fs_id unless old 4.2BSD file system */ 167 if (!printonly) { 168 /* Randomize fs_id and write out new sblock and backups */ 169 sblock->fs_id[0] = (u_int32_t)time(NULL); 170 sblock->fs_id[1] = random(); 171 if (sbput(devfd, sblock, sblock->fs_ncg) != 0) { 172 warn("could not write updated superblock"); 173 return (1); 174 } 175 } 176 177 /* For each cylinder group, randomize inodes and update backup sblock */ 178 for (cg = 0, inumber = UFS_ROOTINO; cg < (int)sblock->fs_ncg; cg++) { 179 /* Read in inodes, then print or randomize generation nums */ 180 dblk = fsbtodb(sblock, ino_to_fsba(sblock, inumber)); 181 if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) { 182 warn("can't seek to %jd", (intmax_t)dblk * bsize); 183 return (1); 184 } else if ((n = read(devfd, inodebuf, ibufsize)) != ibufsize) { 185 warnx("can't read inodes: %s", 186 (n < ibufsize) ? "short read" : strerror(errno)); 187 return (1); 188 } 189 190 dp1 = (struct ufs1_dinode *)(void *)inodebuf; 191 dp2 = (struct ufs2_dinode *)(void *)inodebuf; 192 for (n = cg > 0 ? 0 : UFS_ROOTINO; 193 n < (int)sblock->fs_ipg; 194 n++, inumber++) { 195 if (printonly) { 196 (void)printf("ino %ju gen %08x\n", 197 (uintmax_t)inumber, 198 sblock->fs_magic == FS_UFS1_MAGIC ? 199 dp1->di_gen : dp2->di_gen); 200 } else if (sblock->fs_magic == FS_UFS1_MAGIC) { 201 dp1->di_gen = arc4random(); 202 dp1++; 203 } else { 204 dp2->di_gen = arc4random(); 205 dp2++; 206 } 207 } 208 209 /* Write out modified inodes */ 210 if (!printonly) { 211 if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) { 212 warn("can't seek to %jd", 213 (intmax_t)dblk * bsize); 214 return (1); 215 } else if ((n = write(devfd, inodebuf, ibufsize)) != 216 ibufsize) { 217 warnx("can't write inodes: %s", 218 (n != ibufsize) ? "short write" : 219 strerror(errno)); 220 return (1); 221 } 222 } 223 } 224 (void)close(devfd); 225 226 return(0); 227 } 228 229 static void 230 usage(void) 231 { 232 (void)fprintf(stderr, 233 "usage: fsirand [-b] [-f] [-p] special [special ...]\n"); 234 exit(1); 235 } 236