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 36static 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 57static void usage(void) __dead2; 58int fsirand(char *); 59 60static int printonly = 0, force = 0, ignorelabel = 0; 61 62int 63main(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 107int 108fsirand(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, -1)) != 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 * Check for unclean filesystem. 141 */ 142 if (sblock->fs_clean == 0 || 143 (sblock->fs_flags & (FS_UNCLEAN | FS_NEEDSFSCK)) != 0) 144 errx(1, "%s is not clean - run fsck.\n", device); 145 146 if (sblock->fs_magic == FS_UFS1_MAGIC && 147 sblock->fs_old_inodefmt < FS_44INODEFMT) { 148 warnx("file system format is too old, sorry"); 149 return (1); 150 } 151 if (!force && !printonly && sblock->fs_clean != 1) { 152 warnx("file system is not clean, fsck %s first", device); 153 return (1); 154 } 155 156 /* XXX - should really cap buffer at 512kb or so */ 157 if (sblock->fs_magic == FS_UFS1_MAGIC) 158 ibufsize = sizeof(struct ufs1_dinode) * sblock->fs_ipg; 159 else 160 ibufsize = sizeof(struct ufs2_dinode) * sblock->fs_ipg; 161 if ((inodebuf = malloc(ibufsize)) == NULL) 162 errx(1, "can't allocate memory for inode buffer"); 163 164 if (printonly && (sblock->fs_id[0] || sblock->fs_id[1])) { 165 if (sblock->fs_id[0]) 166 (void)printf("%s was randomized on %s", device, 167 ctime((void *)&(sblock->fs_id[0]))); 168 (void)printf("fsid: %x %x\n", sblock->fs_id[0], 169 sblock->fs_id[1]); 170 } 171 172 /* Randomize fs_id unless old 4.2BSD file system */ 173 if (!printonly) { 174 /* Randomize fs_id and write out new sblock and backups */ 175 sblock->fs_id[0] = (u_int32_t)time(NULL); 176 sblock->fs_id[1] = random(); 177 if (sbput(devfd, sblock, sblock->fs_ncg) != 0) { 178 warn("could not write updated superblock"); 179 return (1); 180 } 181 } 182 183 /* For each cylinder group, randomize inodes and update backup sblock */ 184 for (cg = 0, inumber = 0; cg < (int)sblock->fs_ncg; cg++) { 185 /* Read in inodes, then print or randomize generation nums */ 186 dblk = fsbtodb(sblock, ino_to_fsba(sblock, inumber)); 187 if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) { 188 warn("can't seek to %jd", (intmax_t)dblk * bsize); 189 return (1); 190 } else if ((n = read(devfd, inodebuf, ibufsize)) != ibufsize) { 191 warnx("can't read inodes: %s", 192 (n < ibufsize) ? "short read" : strerror(errno)); 193 return (1); 194 } 195 196 for (n = 0; n < (int)sblock->fs_ipg; n++, inumber++) { 197 if (sblock->fs_magic == FS_UFS1_MAGIC) 198 dp1 = &((struct ufs1_dinode *)inodebuf)[n]; 199 else 200 dp2 = &((struct ufs2_dinode *)inodebuf)[n]; 201 if (inumber >= UFS_ROOTINO) { 202 if (printonly) 203 (void)printf("ino %ju gen %08x\n", 204 (uintmax_t)inumber, 205 sblock->fs_magic == FS_UFS1_MAGIC ? 206 dp1->di_gen : dp2->di_gen); 207 else if (sblock->fs_magic == FS_UFS1_MAGIC) 208 dp1->di_gen = random(); 209 else 210 dp2->di_gen = random(); 211 } 212 } 213 214 /* Write out modified inodes */ 215 if (!printonly) { 216 if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) { 217 warn("can't seek to %jd", 218 (intmax_t)dblk * bsize); 219 return (1); 220 } else if ((n = write(devfd, inodebuf, ibufsize)) != 221 ibufsize) { 222 warnx("can't write inodes: %s", 223 (n != ibufsize) ? "short write" : 224 strerror(errno)); 225 return (1); 226 } 227 } 228 } 229 (void)close(devfd); 230 231 return(0); 232} 233 234static void 235usage(void) 236{ 237 (void)fprintf(stderr, 238 "usage: fsirand [-b] [-f] [-p] special [special ...]\n"); 239 exit(1); 240} 241