fsirand.c revision 24216
124149Sguido/* $OpenBSD: fsirand.c,v 1.9 1997/02/28 00:46:33 millert Exp $ */ 224149Sguido 324149Sguido/* 424149Sguido * Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com> 524149Sguido * All rights reserved. 624149Sguido * 724149Sguido * Redistribution and use in source and binary forms, with or without 824149Sguido * modification, are permitted provided that the following conditions 924149Sguido * are met: 1024149Sguido * 1. Redistributions of source code must retain the above copyright 1124149Sguido * notice, this list of conditions and the following disclaimer. 1224149Sguido * 2. Redistributions in binary form must reproduce the above copyright 1324149Sguido * notice, this list of conditions and the following disclaimer in the 1424149Sguido * documentation and/or other materials provided with the distribution. 1524149Sguido * 3. All advertising materials mentioning features or use of this software 1624149Sguido * must display the following acknowledgement: 1724149Sguido * This product includes software developed by Todd C. Miller. 1824149Sguido * 4. The name of the author may not be used to endorse or promote products 1924149Sguido * derived from this software without specific prior written permission. 2024149Sguido * 2124149Sguido * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, 2224149Sguido * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY 2324149Sguido * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 2424149Sguido * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 2524149Sguido * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 2624149Sguido * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 2724149Sguido * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 2824149Sguido * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 2924149Sguido * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 3024149Sguido * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 3124149Sguido */ 3224149Sguido 3337275Scharnier#ifndef lint 3437275Scharnierstatic char rcsid[] = "$OpenBSD: fsirand.c,v 1.9 1997/02/28 00:46:33 millert Exp $"; 3550476Speter#endif /* not lint */ 3637275Scharnier 3724149Sguido#include <sys/types.h> 3824149Sguido#include <sys/disklabel.h> 3924149Sguido#include <sys/ioctl.h> 4024149Sguido#include <sys/param.h> 4124149Sguido#include <sys/time.h> 4224149Sguido#include <sys/resource.h> 4324149Sguido 4424149Sguido#include <ufs/ffs/fs.h> 4524149Sguido#include <ufs/ufs/dinode.h> 4624149Sguido 4724149Sguido#include <err.h> 4824149Sguido#include <errno.h> 4924149Sguido#include <fcntl.h> 5024149Sguido#include <stdio.h> 5124149Sguido#include <stdlib.h> 5224149Sguido#include <string.h> 5324149Sguido#include <time.h> 5424149Sguido#include <unistd.h> 5537275Scharnier 5624149Sguidovoid usage __P((int)); 5724149Sguidoint fsirand __P((char *)); 5824149Sguido 5924149Sguidoextern char *__progname; 6024149Sguido 6124149Sguidoint printonly = 0, force = 0, ignorelabel = 0; 6224149Sguido 6324149Sguidoint 6424149Sguidomain(argc, argv) 6524149Sguido int argc; 6624149Sguido char *argv[]; 6724149Sguido{ 6824149Sguido int n, ex = 0; 6924149Sguido struct rlimit rl; 7024149Sguido 7124149Sguido while ((n = getopt(argc, argv, "bfp")) != -1) { 7224149Sguido switch (n) { 7324149Sguido case 'b': 7424149Sguido ignorelabel++; 7524149Sguido break; 7624149Sguido case 'p': 7724149Sguido printonly++; 7824149Sguido break; 7924149Sguido case 'f': 8037275Scharnier force++; 8124149Sguido break; 8224149Sguido default: 8324149Sguido usage(1); 8437275Scharnier } 8524149Sguido } 8626625Sache if (argc - optind < 1) 8724216Sache usage(1); 8824149Sguido 8924149Sguido if (srandomdev() < 0) 9024149Sguido srandom(time(NULL) ^ getpid()); 9124149Sguido 9237275Scharnier /* Increase our data size to the max */ 9324149Sguido if (getrlimit(RLIMIT_DATA, &rl) == 0) { 9437275Scharnier rl.rlim_cur = rl.rlim_max; 9524149Sguido if (setrlimit(RLIMIT_DATA, &rl) < 0) 9624149Sguido warn("Can't get resource limit to max data size"); 9724149Sguido } else 9824149Sguido warn("Can't get resource limit for data size"); 9924149Sguido 10024149Sguido for (n = optind; n < argc; n++) { 10124149Sguido if (argc - optind != 1) 10224149Sguido (void)puts(argv[n]); 10324149Sguido ex += fsirand(argv[n]); 10424149Sguido if (n < argc - 1) 10524149Sguido putchar('\n'); 10624149Sguido } 10724149Sguido 10824149Sguido exit(ex); 10924149Sguido} 11024149Sguido 11124149Sguidoint 11224149Sguidofsirand(device) 11324149Sguido char *device; 11424149Sguido{ 11524149Sguido static struct dinode *inodebuf; 11624149Sguido static size_t oldibufsize; 11724149Sguido size_t ibufsize; 11824149Sguido struct fs *sblock; 11924149Sguido ino_t inumber, maxino; 12024149Sguido daddr_t dblk; 12124149Sguido char sbuf[SBSIZE], sbuftmp[SBSIZE]; 12224149Sguido int devfd, n, cg; 12337275Scharnier u_int32_t bsize = DEV_BSIZE; 12424149Sguido struct disklabel label; 12524149Sguido 12624149Sguido if ((devfd = open(device, printonly ? O_RDONLY : O_RDWR)) < 0) { 12724149Sguido warn("Can't open %s", device); 12824149Sguido return (1); 12924149Sguido } 13037275Scharnier 13124149Sguido /* Get block size (usually 512) from disklabel if possible */ 13224149Sguido if (!ignorelabel) { 13324149Sguido if (ioctl(devfd, DIOCGDINFO, &label) < 0) 13424149Sguido warn("Can't read disklabel, using sector size of %d", 13524149Sguido bsize); 13624149Sguido else 13724149Sguido bsize = label.d_secsize; 13824149Sguido } 13924149Sguido 14037275Scharnier /* Read in master superblock */ 14124149Sguido (void)memset(&sbuf, 0, sizeof(sbuf)); 14224149Sguido sblock = (struct fs *)&sbuf; 14324149Sguido if (lseek(devfd, SBOFF, SEEK_SET) == -1) { 14437275Scharnier warn("Can't seek to superblock (%qd) on %s", SBOFF, device); 14524149Sguido return (1); 14624149Sguido } 14724149Sguido if ((n = read(devfd, (void *)sblock, SBSIZE)) != SBSIZE) { 14824149Sguido warnx("Can't read superblock on %s: %s", device, 14924149Sguido (n < SBSIZE) ? "short read" : strerror(errno)); 15024149Sguido return (1); 15124149Sguido } 15237275Scharnier maxino = sblock->fs_ncg * sblock->fs_ipg; 15324149Sguido 15424149Sguido /* Simple sanity checks on the superblock */ 15524149Sguido if (sblock->fs_magic != FS_MAGIC) { 15637275Scharnier warnx("Bad magic number in superblock"); 15724149Sguido return (1); 15824149Sguido } 15924149Sguido if (sblock->fs_sbsize > SBSIZE) { 16037275Scharnier warnx("Superblock size is preposterous"); 16124149Sguido return (1); 16224149Sguido } 16324149Sguido if (sblock->fs_postblformat == FS_42POSTBLFMT) { 16437275Scharnier warnx("Filesystem format is too old, sorry"); 16524149Sguido return (1); 16624149Sguido } 16724149Sguido if (!force && !printonly && sblock->fs_clean != 1) { 16824149Sguido warnx("Filesystem is not clean, fsck %s first.", device); 16924149Sguido return (1); 17024149Sguido } 17124149Sguido 17224149Sguido /* Make sure backup superblocks are sane. */ 17337275Scharnier sblock = (struct fs *)&sbuftmp; 17424149Sguido for (cg = 0; cg < sblock->fs_ncg; cg++) { 17524149Sguido dblk = fsbtodb(sblock, cgsblock(sblock, cg)); 17637275Scharnier if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) { 17724149Sguido warn("Can't seek to %qd", (off_t)dblk * bsize); 17824149Sguido return (1); 17924149Sguido } else if ((n = write(devfd, (void *)sblock, SBSIZE)) != SBSIZE) { 18024149Sguido warn("Can't read backup superblock %d on %s: %s", 18124149Sguido cg + 1, device, (n < SBSIZE) ? "short write" 18237275Scharnier : strerror(errno)); 18324149Sguido return (1); 18424149Sguido } 18524149Sguido if (sblock->fs_magic != FS_MAGIC) { 18624149Sguido warnx("Bad magic number in backup superblock %d on %s", 18737275Scharnier cg + 1, device); 18824149Sguido return (1); 18924149Sguido } 19024149Sguido if (sblock->fs_sbsize > SBSIZE) { 19124149Sguido warnx("Size of backup superblock %d on %s is preposterous", 19224149Sguido cg + 1, device); 19324149Sguido return (1); 19424149Sguido } 19524149Sguido } 19624149Sguido sblock = (struct fs *)&sbuf; 19724149Sguido 19837275Scharnier /* XXX - should really cap buffer at 512kb or so */ 19924149Sguido ibufsize = sizeof(struct dinode) * sblock->fs_ipg; 20024149Sguido if (oldibufsize < ibufsize) { 20124149Sguido if ((inodebuf = realloc(inodebuf, ibufsize)) == NULL) 20224149Sguido errx(1, "Can't allocate memory for inode buffer"); 20324149Sguido oldibufsize = ibufsize; 20424149Sguido } 20524149Sguido 20624149Sguido if (printonly && (sblock->fs_id[0] || sblock->fs_id[1])) { 20724149Sguido if (sblock->fs_inodefmt >= FS_44INODEFMT && sblock->fs_id[0]) 20824149Sguido (void)printf("%s was randomized on %s", device, 20924149Sguido ctime((const time_t *)&(sblock->fs_id[0]))); 21024149Sguido (void)printf("fsid: %x %x\n", sblock->fs_id[0], 21124149Sguido sblock->fs_id[1]); 21224149Sguido } 21324149Sguido 21424149Sguido /* Randomize fs_id unless old 4.2BSD filesystem */ 21524149Sguido if ((sblock->fs_inodefmt >= FS_44INODEFMT) && !printonly) { 21624149Sguido /* Randomize fs_id and write out new sblock and backups */ 21737275Scharnier sblock->fs_id[0] = (u_int32_t)time(NULL); 21824149Sguido sblock->fs_id[1] = random(); 21924149Sguido 22024149Sguido if (lseek(devfd, SBOFF, SEEK_SET) == -1) { 22124149Sguido warn("Can't seek to superblock (%qd) on %s", SBOFF, 22237275Scharnier device); 22324149Sguido return (1); 22424149Sguido } 22524149Sguido if ((n = write(devfd, (void *)sblock, SBSIZE)) != SBSIZE) { 22624149Sguido warn("Can't read superblock on %s: %s", device, 22724149Sguido (n < SBSIZE) ? "short write" : strerror(errno)); 22824149Sguido return (1); 22924149Sguido } 23024149Sguido } 23124149Sguido 23224149Sguido /* For each cylinder group, randomize inodes and update backup sblock */ 23324149Sguido for (cg = 0, inumber = 0; cg < sblock->fs_ncg; cg++) { 23437275Scharnier /* Update superblock if appropriate */ 23524149Sguido if ((sblock->fs_inodefmt >= FS_44INODEFMT) && !printonly) { 23624149Sguido dblk = fsbtodb(sblock, cgsblock(sblock, cg)); 23737275Scharnier if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) { 23824149Sguido warn("Can't seek to %qd", (off_t)dblk * bsize); 23924149Sguido return (1); 24024149Sguido } else if ((n = write(devfd, (void *)sblock, SBSIZE)) != SBSIZE) { 24124149Sguido warn("Can't read backup superblock %d on %s: %s", 24224149Sguido cg + 1, device, (n < SBSIZE) ? "short write" 24324149Sguido : strerror(errno)); 24424149Sguido return (1); 24524149Sguido } 24624149Sguido } 24737275Scharnier 24824149Sguido /* Read in inodes, then print or randomize generation nums */ 24924149Sguido dblk = fsbtodb(sblock, ino_to_fsba(sblock, inumber)); 25037275Scharnier if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) { 25124149Sguido warn("Can't seek to %qd", (off_t)dblk * bsize); 25224149Sguido return (1); 25324149Sguido } else if ((n = read(devfd, inodebuf, ibufsize)) != ibufsize) { 25424149Sguido warnx("Can't read inodes: %s", 25524149Sguido (n < ibufsize) ? "short read" : strerror(errno)); 25624149Sguido return (1); 25724149Sguido } 25824149Sguido 25924149Sguido for (n = 0; n < sblock->fs_ipg; n++, inumber++) { 26024149Sguido if (inumber >= ROOTINO) { 26124149Sguido if (printonly) 26224149Sguido (void)printf("ino %d gen %x\n", inumber, 26324149Sguido inodebuf[n].di_gen); 26424149Sguido else 26524149Sguido inodebuf[n].di_gen = random(); 26624149Sguido } 26724149Sguido } 26837275Scharnier 26924149Sguido /* Write out modified inodes */ 27024149Sguido if (!printonly) { 27124149Sguido if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) { 27224149Sguido warn("Can't seek to %qd", 27337275Scharnier (off_t)dblk * bsize); 27424149Sguido return (1); 27524149Sguido } else if ((n = write(devfd, inodebuf, ibufsize)) != 27624149Sguido ibufsize) { 27724149Sguido warnx("Can't write inodes: %s", 27824149Sguido (n != ibufsize) ? "short write" : 27924149Sguido strerror(errno)); 28024149Sguido return (1); 28124149Sguido } 28224149Sguido } 28324149Sguido } 28424149Sguido (void)close(devfd); 28526558Scharnier 28637275Scharnier return(0); 28724149Sguido} 28824303Sguido 28937275Scharniervoid 29037275Scharnierusage(ex) 29124149Sguido int ex; 292{ 293 (void)fprintf(stderr, "Usage: %s [ -b ] [ -f ] [ -p ] special [special ...]\n", 294 __progname); 295 exit(ex); 296} 297