/* $OpenBSD: fsirand.c,v 1.9 1997/02/28 00:46:33 millert Exp $ */ /* * Copyright (c) 1997 Todd C. Miller * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by Todd C. Miller. * 4. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #ifndef lint static char rcsid[] = "$OpenBSD: fsirand.c,v 1.9 1997/02/28 00:46:33 millert Exp $"; #endif /* not lint */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include void usage __P((int)); int fsirand __P((char *)); extern char *__progname; int printonly = 0, force = 0, ignorelabel = 0; int main(argc, argv) int argc; char *argv[]; { int n, ex = 0; struct rlimit rl; while ((n = getopt(argc, argv, "bfp")) != -1) { switch (n) { case 'b': ignorelabel++; break; case 'p': printonly++; break; case 'f': force++; break; default: usage(1); } } if (argc - optind < 1) usage(1); /* Increase our data size to the max */ if (getrlimit(RLIMIT_DATA, &rl) == 0) { rl.rlim_cur = rl.rlim_max; if (setrlimit(RLIMIT_DATA, &rl) < 0) warn("Can't get resource limit to max data size"); } else warn("Can't get resource limit for data size"); for (n = optind; n < argc; n++) { if (argc - optind != 1) (void)puts(argv[n]); ex += fsirand(argv[n]); if (n < argc - 1) putchar('\n'); } exit(ex); } int fsirand(device) char *device; { static struct dinode *inodebuf; static size_t oldibufsize; size_t ibufsize; struct fs *sblock; ino_t inumber, maxino; daddr_t dblk; char sbuf[SBSIZE], sbuftmp[SBSIZE]; int devfd, n, cg; char *devpath; u_int32_t bsize = DEV_BSIZE; struct disklabel label; if ((devfd = opendev(device, printonly ? O_RDONLY : O_RDWR, OPENDEV_PART, &devpath)) < 0) { warn("Can't open %s", devpath); return (1); } /* Get block size (usually 512) from disklabel if possible */ if (!ignorelabel) { if (ioctl(devfd, DIOCGDINFO, &label) < 0) warn("Can't read disklabel, using sector size of %d", bsize); else bsize = label.d_secsize; } /* Read in master superblock */ (void)memset(&sbuf, 0, sizeof(sbuf)); sblock = (struct fs *)&sbuf; if (lseek(devfd, SBOFF, SEEK_SET) == -1) { warn("Can't seek to superblock (%qd) on %s", SBOFF, devpath); return (1); } if ((n = read(devfd, (void *)sblock, SBSIZE)) != SBSIZE) { warnx("Can't read superblock on %s: %s", devpath, (n < SBSIZE) ? "short read" : strerror(errno)); return (1); } maxino = sblock->fs_ncg * sblock->fs_ipg; /* Simple sanity checks on the superblock */ if (sblock->fs_magic != FS_MAGIC) { warnx("Bad magic number in superblock"); return (1); } if (sblock->fs_sbsize > SBSIZE) { warnx("Superblock size is preposterous"); return (1); } if (sblock->fs_postblformat == FS_42POSTBLFMT) { warnx("Filesystem format is too old, sorry"); return (1); } if (!force && !printonly && sblock->fs_clean != FS_ISCLEAN) { warnx("Filesystem is not clean, fsck %s first.", devpath); return (1); } /* Make sure backup superblocks are sane. */ sblock = (struct fs *)&sbuftmp; for (cg = 0; cg < sblock->fs_ncg; cg++) { dblk = fsbtodb(sblock, cgsblock(sblock, cg)); if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) { warn("Can't seek to %qd", (off_t)dblk * bsize); return (1); } else if ((n = write(devfd, (void *)sblock, SBSIZE)) != SBSIZE) { warn("Can't read backup superblock %d on %s: %s", cg + 1, devpath, (n < SBSIZE) ? "short write" : strerror(errno)); return (1); } if (sblock->fs_magic != FS_MAGIC) { warnx("Bad magic number in backup superblock %d on %s", cg + 1, devpath); return (1); } if (sblock->fs_sbsize > SBSIZE) { warnx("Size of backup superblock %d on %s is preposterous", cg + 1, devpath); return (1); } } sblock = (struct fs *)&sbuf; /* XXX - should really cap buffer at 512kb or so */ ibufsize = sizeof(struct dinode) * sblock->fs_ipg; if (oldibufsize < ibufsize) { if ((inodebuf = realloc(inodebuf, ibufsize)) == NULL) errx(1, "Can't allocate memory for inode buffer"); oldibufsize = ibufsize; } if (printonly && (sblock->fs_id[0] || sblock->fs_id[1])) { if (sblock->fs_inodefmt >= FS_44INODEFMT && sblock->fs_id[0]) (void)printf("%s was randomized on %s", devpath, ctime((const time_t *)&(sblock->fs_id[0]))); (void)printf("fsid: %x %x\n", sblock->fs_id[0], sblock->fs_id[1]); } /* Randomize fs_id unless old 4.2BSD filesystem */ if ((sblock->fs_inodefmt >= FS_44INODEFMT) && !printonly) { /* Randomize fs_id and write out new sblock and backups */ sblock->fs_id[0] = (u_int32_t)time(NULL); sblock->fs_id[1] = arc4random(); if (lseek(devfd, SBOFF, SEEK_SET) == -1) { warn("Can't seek to superblock (%qd) on %s", SBOFF, devpath); return (1); } if ((n = write(devfd, (void *)sblock, SBSIZE)) != SBSIZE) { warn("Can't read superblock on %s: %s", devpath, (n < SBSIZE) ? "short write" : strerror(errno)); return (1); } } /* For each cylinder group, randomize inodes and update backup sblock */ for (cg = 0, inumber = 0; cg < sblock->fs_ncg; cg++) { /* Update superblock if appropriate */ if ((sblock->fs_inodefmt >= FS_44INODEFMT) && !printonly) { dblk = fsbtodb(sblock, cgsblock(sblock, cg)); if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) { warn("Can't seek to %qd", (off_t)dblk * bsize); return (1); } else if ((n = write(devfd, (void *)sblock, SBSIZE)) != SBSIZE) { warn("Can't read backup superblock %d on %s: %s", cg + 1, devpath, (n < SBSIZE) ? "short write" : strerror(errno)); return (1); } } /* Read in inodes, then print or randomize generation nums */ dblk = fsbtodb(sblock, ino_to_fsba(sblock, inumber)); if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) { warn("Can't seek to %qd", (off_t)dblk * bsize); return (1); } else if ((n = read(devfd, inodebuf, ibufsize)) != ibufsize) { warnx("Can't read inodes: %s", (n < ibufsize) ? "short read" : strerror(errno)); return (1); } for (n = 0; n < sblock->fs_ipg; n++, inumber++) { if (inumber >= ROOTINO) { if (printonly) (void)printf("ino %d gen %x\n", inumber, inodebuf[n].di_gen); else inodebuf[n].di_gen = arc4random(); } } /* Write out modified inodes */ if (!printonly) { if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) { warn("Can't seek to %qd", (off_t)dblk * bsize); return (1); } else if ((n = write(devfd, inodebuf, ibufsize)) != ibufsize) { warnx("Can't write inodes: %s", (n != ibufsize) ? "short write" : strerror(errno)); return (1); } } } (void)close(devfd); return(0); } void usage(ex) int ex; { (void)fprintf(stderr, "Usage: %s [ -b ] [ -f ] [ -p ] special [special ...]\n", __progname); exit(ex); }