fsirand.c revision 227081
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[] = 3550476Speter "$FreeBSD: head/sbin/fsirand/fsirand.c 227081 2011-11-04 13:36:02Z ed $"; 3637275Scharnier#endif /* not lint */ 3724149Sguido 38217769Smckusick#include <sys/param.h> 3924149Sguido#include <sys/disklabel.h> 4024149Sguido#include <sys/resource.h> 4124149Sguido 4298542Smckusick#include <ufs/ufs/dinode.h> 4324149Sguido#include <ufs/ffs/fs.h> 4424149Sguido 4524149Sguido#include <err.h> 4624149Sguido#include <errno.h> 4724149Sguido#include <fcntl.h> 4824149Sguido#include <stdio.h> 49208074Suqs#include <stdint.h> 5024149Sguido#include <stdlib.h> 5124149Sguido#include <string.h> 52217769Smckusick#include <time.h> 5324149Sguido#include <unistd.h> 5424149Sguido 5592881Simpstatic void usage(void) __dead2; 5692881Simpint fsirand(char *); 5724149Sguido 5898542Smckusick/* 5998542Smckusick * Possible superblock locations ordered from most to least likely. 6098542Smckusick */ 6198542Smckusickstatic int sblock_try[] = SBLOCKSEARCH; 6298542Smckusick 63227081Sedstatic int printonly = 0, force = 0, ignorelabel = 0; 6424149Sguido 6524149Sguidoint 6692881Simpmain(int argc, 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': 8024149Sguido force++; 8124149Sguido break; 8224149Sguido default: 8337275Scharnier usage(); 8424149Sguido } 8524149Sguido } 8624149Sguido if (argc - optind < 1) 8737275Scharnier usage(); 8824149Sguido 8926625Sache srandomdev(); 9024216Sache 9124149Sguido /* Increase our data size to the max */ 9224149Sguido if (getrlimit(RLIMIT_DATA, &rl) == 0) { 9324149Sguido rl.rlim_cur = rl.rlim_max; 9424149Sguido if (setrlimit(RLIMIT_DATA, &rl) < 0) 9537275Scharnier warn("can't get resource limit to max data size"); 9624149Sguido } else 9737275Scharnier warn("can't get resource limit for data size"); 9824149Sguido 9924149Sguido for (n = optind; n < argc; n++) { 10024149Sguido if (argc - optind != 1) 10124149Sguido (void)puts(argv[n]); 10224149Sguido ex += fsirand(argv[n]); 10324149Sguido if (n < argc - 1) 10424149Sguido putchar('\n'); 10524149Sguido } 10624149Sguido 10724149Sguido exit(ex); 10824149Sguido} 10924149Sguido 11024149Sguidoint 11192881Simpfsirand(char *device) 11224149Sguido{ 11398542Smckusick struct ufs1_dinode *dp1; 11498542Smckusick struct ufs2_dinode *dp2; 11598542Smckusick caddr_t inodebuf; 116208074Suqs ssize_t ibufsize; 11724149Sguido struct fs *sblock; 11824149Sguido ino_t inumber, maxino; 11998542Smckusick ufs2_daddr_t sblockloc, dblk; 12098542Smckusick char sbuf[SBLOCKSIZE], sbuftmp[SBLOCKSIZE]; 12198542Smckusick int i, devfd, n, cg; 12224149Sguido u_int32_t bsize = DEV_BSIZE; 12324149Sguido struct disklabel label; 12424149Sguido 12524149Sguido if ((devfd = open(device, printonly ? O_RDONLY : O_RDWR)) < 0) { 12637275Scharnier warn("can't open %s", device); 12724149Sguido return (1); 12824149Sguido } 12924149Sguido 13024149Sguido /* Get block size (usually 512) from disklabel if possible */ 13124149Sguido if (!ignorelabel) { 13224149Sguido if (ioctl(devfd, DIOCGDINFO, &label) < 0) 13337275Scharnier warn("can't read disklabel, using sector size of %d", 13424149Sguido bsize); 13524149Sguido else 13624149Sguido bsize = label.d_secsize; 13724149Sguido } 13824149Sguido 139208074Suqs dp1 = NULL; 140208074Suqs dp2 = NULL; 141208074Suqs 14224149Sguido /* Read in master superblock */ 14324149Sguido (void)memset(&sbuf, 0, sizeof(sbuf)); 14424149Sguido sblock = (struct fs *)&sbuf; 14598542Smckusick for (i = 0; sblock_try[i] != -1; i++) { 14698542Smckusick sblockloc = sblock_try[i]; 14798542Smckusick if (lseek(devfd, sblockloc, SEEK_SET) == -1) { 148208074Suqs warn("can't seek to superblock (%jd) on %s", 149208074Suqs (intmax_t)sblockloc, device); 15098542Smckusick return (1); 15198542Smckusick } 15298542Smckusick if ((n = read(devfd, (void *)sblock, SBLOCKSIZE))!=SBLOCKSIZE) { 15398542Smckusick warnx("can't read superblock on %s: %s", device, 15498542Smckusick (n < SBLOCKSIZE) ? "short read" : strerror(errno)); 15598542Smckusick return (1); 15698542Smckusick } 15798542Smckusick if ((sblock->fs_magic == FS_UFS1_MAGIC || 15898542Smckusick (sblock->fs_magic == FS_UFS2_MAGIC && 159107294Smckusick sblock->fs_sblockloc == sblock_try[i])) && 16098542Smckusick sblock->fs_bsize <= MAXBSIZE && 161208074Suqs sblock->fs_bsize >= (ssize_t)sizeof(struct fs)) 16298542Smckusick break; 16324149Sguido } 16498542Smckusick if (sblock_try[i] == -1) { 165102231Strhodes fprintf(stderr, "Cannot find file system superblock\n"); 16624149Sguido return (1); 16724149Sguido } 16824149Sguido maxino = sblock->fs_ncg * sblock->fs_ipg; 16924149Sguido 17098542Smckusick if (sblock->fs_magic == FS_UFS1_MAGIC && 17198542Smckusick sblock->fs_old_inodefmt < FS_44INODEFMT) { 172102231Strhodes warnx("file system format is too old, sorry"); 17324149Sguido return (1); 17424149Sguido } 17524149Sguido if (!force && !printonly && sblock->fs_clean != 1) { 176102231Strhodes warnx("file system is not clean, fsck %s first", device); 17724149Sguido return (1); 17824149Sguido } 17924149Sguido 18024149Sguido /* Make sure backup superblocks are sane. */ 18124149Sguido sblock = (struct fs *)&sbuftmp; 182208074Suqs for (cg = 0; cg < (int)sblock->fs_ncg; cg++) { 18324149Sguido dblk = fsbtodb(sblock, cgsblock(sblock, cg)); 18424149Sguido if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) { 185208074Suqs warn("can't seek to %jd", (intmax_t)dblk * bsize); 18624149Sguido return (1); 18798542Smckusick } else if ((n = write(devfd, (void *)sblock, SBLOCKSIZE)) != SBLOCKSIZE) { 18837275Scharnier warn("can't read backup superblock %d on %s: %s", 18998542Smckusick cg + 1, device, (n < SBLOCKSIZE) ? "short write" 19024149Sguido : strerror(errno)); 19124149Sguido return (1); 19224149Sguido } 19398542Smckusick if (sblock->fs_magic != FS_UFS1_MAGIC && 19498542Smckusick sblock->fs_magic != FS_UFS2_MAGIC) { 19537275Scharnier warnx("bad magic number in backup superblock %d on %s", 19624149Sguido cg + 1, device); 19724149Sguido return (1); 19824149Sguido } 19998542Smckusick if (sblock->fs_sbsize > SBLOCKSIZE) { 20037275Scharnier warnx("size of backup superblock %d on %s is preposterous", 20124149Sguido cg + 1, device); 20224149Sguido return (1); 20324149Sguido } 20424149Sguido } 20524149Sguido sblock = (struct fs *)&sbuf; 20624149Sguido 20724149Sguido /* XXX - should really cap buffer at 512kb or so */ 20898542Smckusick if (sblock->fs_magic == FS_UFS1_MAGIC) 20998542Smckusick ibufsize = sizeof(struct ufs1_dinode) * sblock->fs_ipg; 21098542Smckusick else 21198542Smckusick ibufsize = sizeof(struct ufs2_dinode) * sblock->fs_ipg; 21298542Smckusick if ((inodebuf = malloc(ibufsize)) == NULL) 21398542Smckusick errx(1, "can't allocate memory for inode buffer"); 21424149Sguido 21524149Sguido if (printonly && (sblock->fs_id[0] || sblock->fs_id[1])) { 21698542Smckusick if (sblock->fs_id[0]) 21724149Sguido (void)printf("%s was randomized on %s", device, 218208074Suqs ctime((void *)&(sblock->fs_id[0]))); 21924149Sguido (void)printf("fsid: %x %x\n", sblock->fs_id[0], 22024149Sguido sblock->fs_id[1]); 22124149Sguido } 22224149Sguido 223102231Strhodes /* Randomize fs_id unless old 4.2BSD file system */ 22498542Smckusick if (!printonly) { 22524149Sguido /* Randomize fs_id and write out new sblock and backups */ 22624149Sguido sblock->fs_id[0] = (u_int32_t)time(NULL); 22724149Sguido sblock->fs_id[1] = random(); 22824149Sguido 22998542Smckusick if (lseek(devfd, sblockloc, SEEK_SET) == -1) { 230208074Suqs warn("can't seek to superblock (%jd) on %s", 231208074Suqs (intmax_t)sblockloc, device); 23224149Sguido return (1); 23324149Sguido } 23498542Smckusick if ((n = write(devfd, (void *)sblock, SBLOCKSIZE)) != 23598542Smckusick SBLOCKSIZE) { 23698542Smckusick warn("can't write superblock on %s: %s", device, 23798542Smckusick (n < SBLOCKSIZE) ? "short write" : strerror(errno)); 23824149Sguido return (1); 23924149Sguido } 24024149Sguido } 24124149Sguido 24224149Sguido /* For each cylinder group, randomize inodes and update backup sblock */ 243208074Suqs for (cg = 0, inumber = 0; cg < (int)sblock->fs_ncg; cg++) { 24424149Sguido /* Update superblock if appropriate */ 24598542Smckusick if (!printonly) { 24624149Sguido dblk = fsbtodb(sblock, cgsblock(sblock, cg)); 24724149Sguido if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) { 248208074Suqs warn("can't seek to %jd", 249208074Suqs (intmax_t)dblk * bsize); 25024149Sguido return (1); 25198542Smckusick } else if ((n = write(devfd, (void *)sblock, 25298542Smckusick SBLOCKSIZE)) != SBLOCKSIZE) { 25398542Smckusick warn("can't write backup superblock %d on %s: %s", 25498542Smckusick cg + 1, device, (n < SBLOCKSIZE) ? 25598542Smckusick "short write" : strerror(errno)); 25624149Sguido return (1); 25724149Sguido } 25824149Sguido } 25924149Sguido 26024149Sguido /* Read in inodes, then print or randomize generation nums */ 26124149Sguido dblk = fsbtodb(sblock, ino_to_fsba(sblock, inumber)); 26224149Sguido if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) { 263208074Suqs warn("can't seek to %jd", (intmax_t)dblk * bsize); 26424149Sguido return (1); 26524149Sguido } else if ((n = read(devfd, inodebuf, ibufsize)) != ibufsize) { 26637275Scharnier warnx("can't read inodes: %s", 26724149Sguido (n < ibufsize) ? "short read" : strerror(errno)); 26824149Sguido return (1); 26924149Sguido } 27024149Sguido 271208074Suqs for (n = 0; n < (int)sblock->fs_ipg; n++, inumber++) { 27298542Smckusick if (sblock->fs_magic == FS_UFS1_MAGIC) 27398542Smckusick dp1 = &((struct ufs1_dinode *)inodebuf)[n]; 27498542Smckusick else 27598542Smckusick dp2 = &((struct ufs2_dinode *)inodebuf)[n]; 27624149Sguido if (inumber >= ROOTINO) { 27724149Sguido if (printonly) 278208074Suqs (void)printf("ino %d gen %08x\n", 27998542Smckusick inumber, 28098542Smckusick sblock->fs_magic == FS_UFS1_MAGIC ? 281208074Suqs dp1->di_gen : dp2->di_gen); 282132762Skan else if (sblock->fs_magic == FS_UFS1_MAGIC) 283132762Skan dp1->di_gen = random(); 28424149Sguido else 285132762Skan dp2->di_gen = random(); 28624149Sguido } 28724149Sguido } 28824149Sguido 28924149Sguido /* Write out modified inodes */ 29024149Sguido if (!printonly) { 29124149Sguido if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) { 292208074Suqs warn("can't seek to %jd", 293208074Suqs (intmax_t)dblk * bsize); 29424149Sguido return (1); 29524149Sguido } else if ((n = write(devfd, inodebuf, ibufsize)) != 29624149Sguido ibufsize) { 29737275Scharnier warnx("can't write inodes: %s", 29824149Sguido (n != ibufsize) ? "short write" : 29924149Sguido strerror(errno)); 30024149Sguido return (1); 30124149Sguido } 30224149Sguido } 30324149Sguido } 30424149Sguido (void)close(devfd); 30524149Sguido 30624149Sguido return(0); 30724149Sguido} 30824149Sguido 30926558Scharnierstatic void 31092881Simpusage(void) 31124149Sguido{ 31224303Sguido (void)fprintf(stderr, 31337275Scharnier "usage: fsirand [-b] [-f] [-p] special [special ...]\n"); 31437275Scharnier exit(1); 31524149Sguido} 316