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 /* Increase our data size to the max */ 87 if (getrlimit(RLIMIT_DATA, &rl) == 0) { 88 rl.rlim_cur = rl.rlim_max; 89 if (setrlimit(RLIMIT_DATA, &rl) < 0) 90 warn("can't get resource limit to max data size"); 91 } else 92 warn("can't get resource limit for data size"); 93 94 for (n = optind; n < argc; n++) { 95 if (argc - optind != 1) 96 (void)puts(argv[n]); 97 ex += fsirand(argv[n]); 98 if (n < argc - 1) 99 putchar('\n'); 100 } 101 102 exit(ex); 103 } 104 105 int 106 fsirand(char *device) 107 { 108 struct ufs1_dinode *dp1; 109 struct ufs2_dinode *dp2; 110 caddr_t inodebuf; 111 ssize_t ibufsize; 112 struct fs *sblock; 113 ino_t inumber; 114 ufs2_daddr_t dblk; 115 int devfd, n, cg, ret; 116 u_int32_t bsize = DEV_BSIZE; 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 dp1 = NULL; 124 dp2 = NULL; 125 126 /* Read in master superblock */ 127 if ((ret = sbget(devfd, &sblock, STDSB)) != 0) { 128 switch (ret) { 129 case ENOENT: 130 warn("Cannot find file system superblock"); 131 return (1); 132 default: 133 warn("Unable to read file system superblock"); 134 return (1); 135 } 136 } 137 138 if (sblock->fs_magic == FS_UFS1_MAGIC && 139 sblock->fs_old_inodefmt < FS_44INODEFMT) { 140 warnx("file system format is too old, sorry"); 141 return (1); 142 } 143 if (!force && !printonly && sblock->fs_clean != 1) { 144 warnx("file system is not clean, fsck %s first", device); 145 return (1); 146 } 147 148 /* XXX - should really cap buffer at 512kb or so */ 149 if (sblock->fs_magic == FS_UFS1_MAGIC) 150 ibufsize = sizeof(struct ufs1_dinode) * sblock->fs_ipg; 151 else 152 ibufsize = sizeof(struct ufs2_dinode) * sblock->fs_ipg; 153 if ((inodebuf = malloc(ibufsize)) == NULL) 154 errx(1, "can't allocate memory for inode buffer"); 155 156 if (printonly && (sblock->fs_id[0] || sblock->fs_id[1])) { 157 if (sblock->fs_id[0]) 158 (void)printf("%s was randomized on %s", device, 159 ctime((void *)&(sblock->fs_id[0]))); 160 (void)printf("fsid: %x %x\n", sblock->fs_id[0], 161 sblock->fs_id[1]); 162 } 163 164 /* Randomize fs_id unless old 4.2BSD file system */ 165 if (!printonly) { 166 /* Randomize fs_id and write out new sblock and backups */ 167 sblock->fs_id[0] = (u_int32_t)time(NULL); 168 sblock->fs_id[1] = arc4random(); 169 if (sbput(devfd, sblock, sblock->fs_ncg) != 0) { 170 warn("could not write updated superblock"); 171 return (1); 172 } 173 } 174 175 /* For each cylinder group, randomize inodes and update backup sblock */ 176 for (cg = 0, inumber = UFS_ROOTINO; cg < (int)sblock->fs_ncg; cg++) { 177 /* Read in inodes, then print or randomize generation nums */ 178 dblk = fsbtodb(sblock, ino_to_fsba(sblock, inumber)); 179 if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) { 180 warn("can't seek to %jd", (intmax_t)dblk * bsize); 181 return (1); 182 } else if ((n = read(devfd, inodebuf, ibufsize)) != ibufsize) { 183 warnx("can't read inodes: %s", 184 (n < ibufsize) ? "short read" : strerror(errno)); 185 return (1); 186 } 187 188 dp1 = (struct ufs1_dinode *)(void *)inodebuf; 189 dp2 = (struct ufs2_dinode *)(void *)inodebuf; 190 for (n = cg > 0 ? 0 : UFS_ROOTINO; 191 n < (int)sblock->fs_ipg; 192 n++, inumber++) { 193 if (printonly) { 194 (void)printf("ino %ju gen %08x\n", 195 (uintmax_t)inumber, 196 sblock->fs_magic == FS_UFS1_MAGIC ? 197 dp1->di_gen : dp2->di_gen); 198 } else if (sblock->fs_magic == FS_UFS1_MAGIC) { 199 dp1->di_gen = arc4random(); 200 dp1++; 201 } else { 202 dp2->di_gen = arc4random(); 203 ffs_update_dinode_ckhash(sblock, dp2); 204 dp2++; 205 } 206 } 207 208 /* Write out modified inodes */ 209 if (!printonly) { 210 if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) { 211 warn("can't seek to %jd", 212 (intmax_t)dblk * bsize); 213 return (1); 214 } else if ((n = write(devfd, inodebuf, ibufsize)) != 215 ibufsize) { 216 warnx("can't write inodes: %s", 217 (n != ibufsize) ? "short write" : 218 strerror(errno)); 219 return (1); 220 } 221 } 222 } 223 (void)close(devfd); 224 225 return(0); 226 } 227 228 static void 229 usage(void) 230 { 231 (void)fprintf(stderr, 232 "usage: fsirand [-b] [-f] [-p] special [special ...]\n"); 233 exit(1); 234 } 235