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 * Check for unclean filesystem. 139 */ 140 if (sblock->fs_clean == 0 || 141 (sblock->fs_flags & (FS_UNCLEAN | FS_NEEDSFSCK)) != 0) 142 errx(1, "%s is not clean - run fsck.\n", device); 143 144 if (sblock->fs_magic == FS_UFS1_MAGIC && 145 sblock->fs_old_inodefmt < FS_44INODEFMT) { 146 warnx("file system format is too old, sorry"); 147 return (1); 148 } 149 if (!force && !printonly && sblock->fs_clean != 1) { 150 warnx("file system is not clean, fsck %s first", device); 151 return (1); 152 } 153 154 /* XXX - should really cap buffer at 512kb or so */ 155 if (sblock->fs_magic == FS_UFS1_MAGIC) 156 ibufsize = sizeof(struct ufs1_dinode) * sblock->fs_ipg; 157 else 158 ibufsize = sizeof(struct ufs2_dinode) * sblock->fs_ipg; 159 if ((inodebuf = malloc(ibufsize)) == NULL) 160 errx(1, "can't allocate memory for inode buffer"); 161 162 if (printonly && (sblock->fs_id[0] || sblock->fs_id[1])) { 163 if (sblock->fs_id[0]) 164 (void)printf("%s was randomized on %s", device, 165 ctime((void *)&(sblock->fs_id[0]))); 166 (void)printf("fsid: %x %x\n", sblock->fs_id[0], 167 sblock->fs_id[1]); 168 } 169 170 /* Randomize fs_id unless old 4.2BSD file system */ 171 if (!printonly) { 172 /* Randomize fs_id and write out new sblock and backups */ 173 sblock->fs_id[0] = (u_int32_t)time(NULL); 174 sblock->fs_id[1] = arc4random(); 175 if (sbput(devfd, sblock, sblock->fs_ncg) != 0) { 176 warn("could not write updated superblock"); 177 return (1); 178 } 179 } 180 181 /* For each cylinder group, randomize inodes and update backup sblock */ 182 for (cg = 0, inumber = UFS_ROOTINO; cg < (int)sblock->fs_ncg; cg++) { 183 /* Read in inodes, then print or randomize generation nums */ 184 dblk = fsbtodb(sblock, ino_to_fsba(sblock, inumber)); 185 if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) { 186 warn("can't seek to %jd", (intmax_t)dblk * bsize); 187 return (1); 188 } else if ((n = read(devfd, inodebuf, ibufsize)) != ibufsize) { 189 warnx("can't read inodes: %s", 190 (n < ibufsize) ? "short read" : strerror(errno)); 191 return (1); 192 } 193 194 dp1 = (struct ufs1_dinode *)(void *)inodebuf; 195 dp2 = (struct ufs2_dinode *)(void *)inodebuf; 196 for (n = cg > 0 ? 0 : UFS_ROOTINO; 197 n < (int)sblock->fs_ipg; 198 n++, inumber++) { 199 if (printonly) { 200 (void)printf("ino %ju gen %08x\n", 201 (uintmax_t)inumber, 202 sblock->fs_magic == FS_UFS1_MAGIC ? 203 dp1->di_gen : dp2->di_gen); 204 } else if (sblock->fs_magic == FS_UFS1_MAGIC) { 205 dp1->di_gen = arc4random(); 206 dp1++; 207 } else { 208 dp2->di_gen = arc4random(); 209 ffs_update_dinode_ckhash(sblock, dp2); 210 dp2++; 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 } 233 234 static void 235 usage(void) 236 { 237 (void)fprintf(stderr, 238 "usage: fsirand [-b] [-f] [-p] special [special ...]\n"); 239 exit(1); 240 } 241