fsirand.c revision 37275
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 const char rcsid[] = 3537275Scharnier "$Id$"; 3637275Scharnier#endif /* not lint */ 3724149Sguido 3824149Sguido#include <sys/types.h> 3924149Sguido#include <sys/disklabel.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 <unistd.h> 5424149Sguido 5537275Scharnierstatic void usage __P((void)); 5624149Sguidoint fsirand __P((char *)); 5724149Sguido 5824149Sguidoint printonly = 0, force = 0, ignorelabel = 0; 5924149Sguido 6024149Sguidoint 6124149Sguidomain(argc, argv) 6224149Sguido int argc; 6324149Sguido char *argv[]; 6424149Sguido{ 6524149Sguido int n, ex = 0; 6624149Sguido struct rlimit rl; 6724149Sguido 6824149Sguido while ((n = getopt(argc, argv, "bfp")) != -1) { 6924149Sguido switch (n) { 7024149Sguido case 'b': 7124149Sguido ignorelabel++; 7224149Sguido break; 7324149Sguido case 'p': 7424149Sguido printonly++; 7524149Sguido break; 7624149Sguido case 'f': 7724149Sguido force++; 7824149Sguido break; 7924149Sguido default: 8037275Scharnier usage(); 8124149Sguido } 8224149Sguido } 8324149Sguido if (argc - optind < 1) 8437275Scharnier usage(); 8524149Sguido 8626625Sache srandomdev(); 8724216Sache 8824149Sguido /* Increase our data size to the max */ 8924149Sguido if (getrlimit(RLIMIT_DATA, &rl) == 0) { 9024149Sguido rl.rlim_cur = rl.rlim_max; 9124149Sguido if (setrlimit(RLIMIT_DATA, &rl) < 0) 9237275Scharnier warn("can't get resource limit to max data size"); 9324149Sguido } else 9437275Scharnier warn("can't get resource limit for data size"); 9524149Sguido 9624149Sguido for (n = optind; n < argc; n++) { 9724149Sguido if (argc - optind != 1) 9824149Sguido (void)puts(argv[n]); 9924149Sguido ex += fsirand(argv[n]); 10024149Sguido if (n < argc - 1) 10124149Sguido putchar('\n'); 10224149Sguido } 10324149Sguido 10424149Sguido exit(ex); 10524149Sguido} 10624149Sguido 10724149Sguidoint 10824149Sguidofsirand(device) 10924149Sguido char *device; 11024149Sguido{ 11124149Sguido static struct dinode *inodebuf; 11224149Sguido static size_t oldibufsize; 11324149Sguido size_t ibufsize; 11424149Sguido struct fs *sblock; 11524149Sguido ino_t inumber, maxino; 11624149Sguido daddr_t dblk; 11724149Sguido char sbuf[SBSIZE], sbuftmp[SBSIZE]; 11824149Sguido int devfd, n, cg; 11924149Sguido u_int32_t bsize = DEV_BSIZE; 12024149Sguido struct disklabel label; 12124149Sguido 12224149Sguido if ((devfd = open(device, printonly ? O_RDONLY : O_RDWR)) < 0) { 12337275Scharnier warn("can't open %s", device); 12424149Sguido return (1); 12524149Sguido } 12624149Sguido 12724149Sguido /* Get block size (usually 512) from disklabel if possible */ 12824149Sguido if (!ignorelabel) { 12924149Sguido if (ioctl(devfd, DIOCGDINFO, &label) < 0) 13037275Scharnier warn("can't read disklabel, using sector size of %d", 13124149Sguido bsize); 13224149Sguido else 13324149Sguido bsize = label.d_secsize; 13424149Sguido } 13524149Sguido 13624149Sguido /* Read in master superblock */ 13724149Sguido (void)memset(&sbuf, 0, sizeof(sbuf)); 13824149Sguido sblock = (struct fs *)&sbuf; 13924149Sguido if (lseek(devfd, SBOFF, SEEK_SET) == -1) { 14037275Scharnier warn("can't seek to superblock (%qd) on %s", SBOFF, device); 14124149Sguido return (1); 14224149Sguido } 14324149Sguido if ((n = read(devfd, (void *)sblock, SBSIZE)) != SBSIZE) { 14437275Scharnier warnx("can't read superblock on %s: %s", device, 14524149Sguido (n < SBSIZE) ? "short read" : strerror(errno)); 14624149Sguido return (1); 14724149Sguido } 14824149Sguido maxino = sblock->fs_ncg * sblock->fs_ipg; 14924149Sguido 15024149Sguido /* Simple sanity checks on the superblock */ 15124149Sguido if (sblock->fs_magic != FS_MAGIC) { 15237275Scharnier warnx("bad magic number in superblock"); 15324149Sguido return (1); 15424149Sguido } 15524149Sguido if (sblock->fs_sbsize > SBSIZE) { 15637275Scharnier warnx("superblock size is preposterous"); 15724149Sguido return (1); 15824149Sguido } 15924149Sguido if (sblock->fs_postblformat == FS_42POSTBLFMT) { 16037275Scharnier warnx("filesystem format is too old, sorry"); 16124149Sguido return (1); 16224149Sguido } 16324149Sguido if (!force && !printonly && sblock->fs_clean != 1) { 16437275Scharnier warnx("filesystem is not clean, fsck %s first", device); 16524149Sguido return (1); 16624149Sguido } 16724149Sguido 16824149Sguido /* Make sure backup superblocks are sane. */ 16924149Sguido sblock = (struct fs *)&sbuftmp; 17024149Sguido for (cg = 0; cg < sblock->fs_ncg; cg++) { 17124149Sguido dblk = fsbtodb(sblock, cgsblock(sblock, cg)); 17224149Sguido if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) { 17337275Scharnier warn("can't seek to %qd", (off_t)dblk * bsize); 17424149Sguido return (1); 17524149Sguido } else if ((n = write(devfd, (void *)sblock, SBSIZE)) != SBSIZE) { 17637275Scharnier warn("can't read backup superblock %d on %s: %s", 17724149Sguido cg + 1, device, (n < SBSIZE) ? "short write" 17824149Sguido : strerror(errno)); 17924149Sguido return (1); 18024149Sguido } 18124149Sguido if (sblock->fs_magic != FS_MAGIC) { 18237275Scharnier warnx("bad magic number in backup superblock %d on %s", 18324149Sguido cg + 1, device); 18424149Sguido return (1); 18524149Sguido } 18624149Sguido if (sblock->fs_sbsize > SBSIZE) { 18737275Scharnier warnx("size of backup superblock %d on %s is preposterous", 18824149Sguido cg + 1, device); 18924149Sguido return (1); 19024149Sguido } 19124149Sguido } 19224149Sguido sblock = (struct fs *)&sbuf; 19324149Sguido 19424149Sguido /* XXX - should really cap buffer at 512kb or so */ 19524149Sguido ibufsize = sizeof(struct dinode) * sblock->fs_ipg; 19624149Sguido if (oldibufsize < ibufsize) { 19724149Sguido if ((inodebuf = realloc(inodebuf, ibufsize)) == NULL) 19837275Scharnier errx(1, "can't allocate memory for inode buffer"); 19924149Sguido oldibufsize = ibufsize; 20024149Sguido } 20124149Sguido 20224149Sguido if (printonly && (sblock->fs_id[0] || sblock->fs_id[1])) { 20324149Sguido if (sblock->fs_inodefmt >= FS_44INODEFMT && sblock->fs_id[0]) 20424149Sguido (void)printf("%s was randomized on %s", device, 20524149Sguido ctime((const time_t *)&(sblock->fs_id[0]))); 20624149Sguido (void)printf("fsid: %x %x\n", sblock->fs_id[0], 20724149Sguido sblock->fs_id[1]); 20824149Sguido } 20924149Sguido 21024149Sguido /* Randomize fs_id unless old 4.2BSD filesystem */ 21124149Sguido if ((sblock->fs_inodefmt >= FS_44INODEFMT) && !printonly) { 21224149Sguido /* Randomize fs_id and write out new sblock and backups */ 21324149Sguido sblock->fs_id[0] = (u_int32_t)time(NULL); 21424149Sguido sblock->fs_id[1] = random(); 21524149Sguido 21624149Sguido if (lseek(devfd, SBOFF, SEEK_SET) == -1) { 21737275Scharnier warn("can't seek to superblock (%qd) on %s", SBOFF, 21824149Sguido device); 21924149Sguido return (1); 22024149Sguido } 22124149Sguido if ((n = write(devfd, (void *)sblock, SBSIZE)) != SBSIZE) { 22237275Scharnier warn("can't read superblock on %s: %s", device, 22324149Sguido (n < SBSIZE) ? "short write" : strerror(errno)); 22424149Sguido return (1); 22524149Sguido } 22624149Sguido } 22724149Sguido 22824149Sguido /* For each cylinder group, randomize inodes and update backup sblock */ 22924149Sguido for (cg = 0, inumber = 0; cg < sblock->fs_ncg; cg++) { 23024149Sguido /* Update superblock if appropriate */ 23124149Sguido if ((sblock->fs_inodefmt >= FS_44INODEFMT) && !printonly) { 23224149Sguido dblk = fsbtodb(sblock, cgsblock(sblock, cg)); 23324149Sguido if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) { 23437275Scharnier warn("can't seek to %qd", (off_t)dblk * bsize); 23524149Sguido return (1); 23624149Sguido } else if ((n = write(devfd, (void *)sblock, SBSIZE)) != SBSIZE) { 23737275Scharnier warn("can't read backup superblock %d on %s: %s", 23824149Sguido cg + 1, device, (n < SBSIZE) ? "short write" 23924149Sguido : strerror(errno)); 24024149Sguido return (1); 24124149Sguido } 24224149Sguido } 24324149Sguido 24424149Sguido /* Read in inodes, then print or randomize generation nums */ 24524149Sguido dblk = fsbtodb(sblock, ino_to_fsba(sblock, inumber)); 24624149Sguido if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) { 24737275Scharnier warn("can't seek to %qd", (off_t)dblk * bsize); 24824149Sguido return (1); 24924149Sguido } else if ((n = read(devfd, inodebuf, ibufsize)) != ibufsize) { 25037275Scharnier warnx("can't read inodes: %s", 25124149Sguido (n < ibufsize) ? "short read" : strerror(errno)); 25224149Sguido return (1); 25324149Sguido } 25424149Sguido 25524149Sguido for (n = 0; n < sblock->fs_ipg; n++, inumber++) { 25624149Sguido if (inumber >= ROOTINO) { 25724149Sguido if (printonly) 25824149Sguido (void)printf("ino %d gen %x\n", inumber, 25924149Sguido inodebuf[n].di_gen); 26024149Sguido else 26124149Sguido inodebuf[n].di_gen = random(); 26224149Sguido } 26324149Sguido } 26424149Sguido 26524149Sguido /* Write out modified inodes */ 26624149Sguido if (!printonly) { 26724149Sguido if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) { 26837275Scharnier warn("can't seek to %qd", 26924149Sguido (off_t)dblk * bsize); 27024149Sguido return (1); 27124149Sguido } else if ((n = write(devfd, inodebuf, ibufsize)) != 27224149Sguido ibufsize) { 27337275Scharnier warnx("can't write inodes: %s", 27424149Sguido (n != ibufsize) ? "short write" : 27524149Sguido strerror(errno)); 27624149Sguido return (1); 27724149Sguido } 27824149Sguido } 27924149Sguido } 28024149Sguido (void)close(devfd); 28124149Sguido 28224149Sguido return(0); 28324149Sguido} 28424149Sguido 28526558Scharnierstatic void 28637275Scharnierusage() 28724149Sguido{ 28824303Sguido (void)fprintf(stderr, 28937275Scharnier "usage: fsirand [-b] [-f] [-p] special [special ...]\n"); 29037275Scharnier exit(1); 29124149Sguido} 292