1 /* $OpenBSD: fsirand.c,v 1.9 1997/02/28 00:46:33 millert Exp $ */ 2 3 /*- 4 * SPDX-License-Identifier: BSD-2-Clause 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 #include <sys/param.h> 36 #include <sys/resource.h> 37 38 #include <ufs/ufs/dinode.h> 39 #include <ufs/ffs/fs.h> 40 41 #include <err.h> 42 #include <errno.h> 43 #include <fcntl.h> 44 #include <libufs.h> 45 #include <stdio.h> 46 #include <stdint.h> 47 #include <stdlib.h> 48 #include <string.h> 49 #include <time.h> 50 #include <unistd.h> 51 52 static void usage(void) __dead2; 53 int fsirand(char *); 54 55 static 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 /* Increase our data size to the max */ 82 if (getrlimit(RLIMIT_DATA, &rl) == 0) { 83 rl.rlim_cur = rl.rlim_max; 84 if (setrlimit(RLIMIT_DATA, &rl) < 0) 85 warn("can't get resource limit to max data size"); 86 } else 87 warn("can't get resource limit for data size"); 88 89 for (n = optind; n < argc; n++) { 90 if (argc - optind != 1) 91 (void)puts(argv[n]); 92 ex += fsirand(argv[n]); 93 if (n < argc - 1) 94 putchar('\n'); 95 } 96 97 exit(ex); 98 } 99 100 int 101 fsirand(char *device) 102 { 103 struct ufs1_dinode *dp1; 104 struct ufs2_dinode *dp2; 105 caddr_t inodebuf; 106 ssize_t ibufsize; 107 struct fs *sblock; 108 ino_t inumber; 109 ufs2_daddr_t dblk; 110 int devfd, n, cg; 111 u_int32_t bsize = DEV_BSIZE; 112 113 if ((devfd = open(device, printonly ? O_RDONLY : O_RDWR)) < 0) { 114 warn("can't open %s", device); 115 return (1); 116 } 117 118 dp1 = NULL; 119 dp2 = NULL; 120 121 /* Read in master superblock */ 122 if ((errno = sbget(devfd, &sblock, UFS_STDSB, UFS_NOCSUM)) != 0) { 123 switch (errno) { 124 case ENOENT: 125 warnx("Cannot find file system superblock"); 126 return (1); 127 default: 128 warn("Unable to read file system superblock"); 129 return (1); 130 } 131 } 132 /* 133 * Check for unclean filesystem. 134 */ 135 if (sblock->fs_clean == 0 || 136 (sblock->fs_flags & (FS_UNCLEAN | FS_NEEDSFSCK)) != 0) 137 errx(1, "%s is not clean - run fsck.\n", device); 138 139 if (sblock->fs_magic == FS_UFS1_MAGIC && 140 sblock->fs_old_inodefmt < FS_44INODEFMT) { 141 warnx("file system format is too old, sorry"); 142 return (1); 143 } 144 if (!force && !printonly && sblock->fs_clean != 1) { 145 warnx("file system is not clean, fsck %s first", device); 146 return (1); 147 } 148 149 /* XXX - should really cap buffer at 512kb or so */ 150 if (sblock->fs_magic == FS_UFS1_MAGIC) 151 ibufsize = sizeof(struct ufs1_dinode) * sblock->fs_ipg; 152 else 153 ibufsize = sizeof(struct ufs2_dinode) * sblock->fs_ipg; 154 if ((inodebuf = malloc(ibufsize)) == NULL) 155 errx(1, "can't allocate memory for inode buffer"); 156 157 if (printonly && (sblock->fs_id[0] || sblock->fs_id[1])) { 158 if (sblock->fs_id[0]) 159 (void)printf("%s was randomized on %s", device, 160 ctime((void *)&(sblock->fs_id[0]))); 161 (void)printf("fsid: %x %x\n", sblock->fs_id[0], 162 sblock->fs_id[1]); 163 } 164 165 /* Randomize fs_id unless old 4.2BSD file system */ 166 if (!printonly) { 167 /* Randomize fs_id and write out new sblock and backups */ 168 sblock->fs_id[0] = (u_int32_t)time(NULL); 169 sblock->fs_id[1] = arc4random(); 170 if (sbput(devfd, sblock, sblock->fs_ncg) != 0) { 171 warn("could not write updated superblock"); 172 return (1); 173 } 174 } 175 176 /* For each cylinder group, randomize inodes and update backup sblock */ 177 for (cg = 0, inumber = UFS_ROOTINO; cg < (int)sblock->fs_ncg; cg++) { 178 /* Read in inodes, then print or randomize generation nums */ 179 dblk = fsbtodb(sblock, ino_to_fsba(sblock, inumber)); 180 if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) { 181 warn("can't seek to %jd", (intmax_t)dblk * bsize); 182 return (1); 183 } else if ((n = read(devfd, inodebuf, ibufsize)) != ibufsize) { 184 warnx("can't read inodes: %s", 185 (n < ibufsize) ? "short read" : strerror(errno)); 186 return (1); 187 } 188 189 dp1 = (struct ufs1_dinode *)(void *)inodebuf; 190 dp2 = (struct ufs2_dinode *)(void *)inodebuf; 191 for (n = cg > 0 ? 0 : UFS_ROOTINO; 192 n < (int)sblock->fs_ipg; 193 n++, inumber++) { 194 if (printonly) { 195 (void)printf("ino %ju gen %08x\n", 196 (uintmax_t)inumber, 197 sblock->fs_magic == FS_UFS1_MAGIC ? 198 dp1->di_gen : dp2->di_gen); 199 } else if (sblock->fs_magic == FS_UFS1_MAGIC) { 200 dp1->di_gen = arc4random(); 201 dp1++; 202 } else { 203 dp2->di_gen = arc4random(); 204 ffs_update_dinode_ckhash(sblock, dp2); 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