9251693096
the old 8-bit fs_old_flags to the new location the first time that the filesystem is mounted by a new kernel. One of the unused flags in fs_old_flags is used to indicate that the flags have been moved. Leave the fs_old_flags word intact so that it will work properly if used on an old kernel. Change the fs_sblockloc superblock location field to be in units of bytes instead of in units of filesystem fragments. The old units did not work properly when the fragment size exceeeded the superblock size (8192). Update old fs_sblockloc values at the same time that the flags are moved. Suggested by: BOUWSMA Barry <freebsd-misuser@netscum.dyndns.dk> Sponsored by: DARPA & NAI Labs.
310 lines
8.9 KiB
C
310 lines
8.9 KiB
C
/* $OpenBSD: fsirand.c,v 1.9 1997/02/28 00:46:33 millert Exp $ */
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/*
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* Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Todd C. Miller.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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* THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef lint
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static const char rcsid[] =
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"$FreeBSD$";
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#endif /* not lint */
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#include <sys/disklabel.h>
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#include <sys/param.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <ufs/ufs/dinode.h>
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#include <ufs/ffs/fs.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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static void usage(void) __dead2;
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int fsirand(char *);
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/*
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* Possible superblock locations ordered from most to least likely.
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*/
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static int sblock_try[] = SBLOCKSEARCH;
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int printonly = 0, force = 0, ignorelabel = 0;
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int
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main(int argc, char *argv[])
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{
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int n, ex = 0;
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struct rlimit rl;
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while ((n = getopt(argc, argv, "bfp")) != -1) {
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switch (n) {
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case 'b':
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ignorelabel++;
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break;
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case 'p':
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printonly++;
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break;
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case 'f':
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force++;
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break;
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default:
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usage();
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}
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}
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if (argc - optind < 1)
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usage();
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srandomdev();
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/* Increase our data size to the max */
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if (getrlimit(RLIMIT_DATA, &rl) == 0) {
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rl.rlim_cur = rl.rlim_max;
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if (setrlimit(RLIMIT_DATA, &rl) < 0)
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warn("can't get resource limit to max data size");
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} else
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warn("can't get resource limit for data size");
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for (n = optind; n < argc; n++) {
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if (argc - optind != 1)
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(void)puts(argv[n]);
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ex += fsirand(argv[n]);
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if (n < argc - 1)
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putchar('\n');
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}
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exit(ex);
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}
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int
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fsirand(char *device)
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{
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struct ufs1_dinode *dp1;
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struct ufs2_dinode *dp2;
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caddr_t inodebuf;
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size_t ibufsize;
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struct fs *sblock;
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ino_t inumber, maxino;
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ufs2_daddr_t sblockloc, dblk;
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char sbuf[SBLOCKSIZE], sbuftmp[SBLOCKSIZE];
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int i, devfd, n, cg;
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u_int32_t bsize = DEV_BSIZE;
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struct disklabel label;
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if ((devfd = open(device, printonly ? O_RDONLY : O_RDWR)) < 0) {
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warn("can't open %s", device);
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return (1);
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}
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/* Get block size (usually 512) from disklabel if possible */
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if (!ignorelabel) {
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if (ioctl(devfd, DIOCGDINFO, &label) < 0)
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warn("can't read disklabel, using sector size of %d",
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bsize);
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else
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bsize = label.d_secsize;
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}
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/* Read in master superblock */
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(void)memset(&sbuf, 0, sizeof(sbuf));
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sblock = (struct fs *)&sbuf;
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for (i = 0; sblock_try[i] != -1; i++) {
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sblockloc = sblock_try[i];
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if (lseek(devfd, sblockloc, SEEK_SET) == -1) {
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warn("can't seek to superblock (%qd) on %s",
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sblockloc, device);
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return (1);
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}
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if ((n = read(devfd, (void *)sblock, SBLOCKSIZE))!=SBLOCKSIZE) {
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warnx("can't read superblock on %s: %s", device,
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(n < SBLOCKSIZE) ? "short read" : strerror(errno));
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return (1);
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}
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if ((sblock->fs_magic == FS_UFS1_MAGIC ||
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(sblock->fs_magic == FS_UFS2_MAGIC &&
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sblock->fs_sblockloc == sblock_try[i])) &&
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sblock->fs_bsize <= MAXBSIZE &&
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sblock->fs_bsize >= sizeof(struct fs))
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break;
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}
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if (sblock_try[i] == -1) {
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fprintf(stderr, "Cannot find file system superblock\n");
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return (1);
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}
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maxino = sblock->fs_ncg * sblock->fs_ipg;
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if (sblock->fs_magic == FS_UFS1_MAGIC &&
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sblock->fs_old_inodefmt < FS_44INODEFMT) {
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warnx("file system format is too old, sorry");
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return (1);
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}
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if (!force && !printonly && sblock->fs_clean != 1) {
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warnx("file system is not clean, fsck %s first", device);
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return (1);
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}
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/* Make sure backup superblocks are sane. */
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sblock = (struct fs *)&sbuftmp;
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for (cg = 0; cg < sblock->fs_ncg; cg++) {
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dblk = fsbtodb(sblock, cgsblock(sblock, cg));
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if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) {
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warn("can't seek to %qd", (off_t)dblk * bsize);
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return (1);
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} else if ((n = write(devfd, (void *)sblock, SBLOCKSIZE)) != SBLOCKSIZE) {
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warn("can't read backup superblock %d on %s: %s",
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cg + 1, device, (n < SBLOCKSIZE) ? "short write"
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: strerror(errno));
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return (1);
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}
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if (sblock->fs_magic != FS_UFS1_MAGIC &&
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sblock->fs_magic != FS_UFS2_MAGIC) {
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warnx("bad magic number in backup superblock %d on %s",
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cg + 1, device);
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return (1);
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}
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if (sblock->fs_sbsize > SBLOCKSIZE) {
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warnx("size of backup superblock %d on %s is preposterous",
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cg + 1, device);
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return (1);
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}
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}
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sblock = (struct fs *)&sbuf;
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/* XXX - should really cap buffer at 512kb or so */
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if (sblock->fs_magic == FS_UFS1_MAGIC)
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ibufsize = sizeof(struct ufs1_dinode) * sblock->fs_ipg;
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else
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ibufsize = sizeof(struct ufs2_dinode) * sblock->fs_ipg;
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if ((inodebuf = malloc(ibufsize)) == NULL)
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errx(1, "can't allocate memory for inode buffer");
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if (printonly && (sblock->fs_id[0] || sblock->fs_id[1])) {
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if (sblock->fs_id[0])
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(void)printf("%s was randomized on %s", device,
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ctime((const time_t *)&(sblock->fs_id[0])));
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(void)printf("fsid: %x %x\n", sblock->fs_id[0],
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sblock->fs_id[1]);
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}
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/* Randomize fs_id unless old 4.2BSD file system */
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if (!printonly) {
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/* Randomize fs_id and write out new sblock and backups */
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sblock->fs_id[0] = (u_int32_t)time(NULL);
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sblock->fs_id[1] = random();
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if (lseek(devfd, sblockloc, SEEK_SET) == -1) {
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warn("can't seek to superblock (%qd) on %s", sblockloc,
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device);
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return (1);
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}
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if ((n = write(devfd, (void *)sblock, SBLOCKSIZE)) !=
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SBLOCKSIZE) {
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warn("can't write superblock on %s: %s", device,
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(n < SBLOCKSIZE) ? "short write" : strerror(errno));
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return (1);
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}
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}
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/* For each cylinder group, randomize inodes and update backup sblock */
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for (cg = 0, inumber = 0; cg < sblock->fs_ncg; cg++) {
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/* Update superblock if appropriate */
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if (!printonly) {
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dblk = fsbtodb(sblock, cgsblock(sblock, cg));
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if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) {
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warn("can't seek to %qd", (off_t)dblk * bsize);
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return (1);
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} else if ((n = write(devfd, (void *)sblock,
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SBLOCKSIZE)) != SBLOCKSIZE) {
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warn("can't write backup superblock %d on %s: %s",
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cg + 1, device, (n < SBLOCKSIZE) ?
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"short write" : strerror(errno));
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return (1);
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}
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}
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/* Read in inodes, then print or randomize generation nums */
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dblk = fsbtodb(sblock, ino_to_fsba(sblock, inumber));
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if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) {
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warn("can't seek to %qd", (off_t)dblk * bsize);
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return (1);
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} else if ((n = read(devfd, inodebuf, ibufsize)) != ibufsize) {
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warnx("can't read inodes: %s",
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(n < ibufsize) ? "short read" : strerror(errno));
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return (1);
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}
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for (n = 0; n < sblock->fs_ipg; n++, inumber++) {
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if (sblock->fs_magic == FS_UFS1_MAGIC)
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dp1 = &((struct ufs1_dinode *)inodebuf)[n];
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else
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dp2 = &((struct ufs2_dinode *)inodebuf)[n];
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if (inumber >= ROOTINO) {
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if (printonly)
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(void)printf("ino %d gen %qx\n",
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inumber,
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sblock->fs_magic == FS_UFS1_MAGIC ?
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(quad_t)dp1->di_gen : dp2->di_gen);
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else
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(sblock->fs_magic == FS_UFS1_MAGIC ?
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dp1->di_gen : dp2->di_gen) = random();
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}
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}
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/* Write out modified inodes */
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if (!printonly) {
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if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) {
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warn("can't seek to %qd",
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(off_t)dblk * bsize);
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return (1);
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} else if ((n = write(devfd, inodebuf, ibufsize)) !=
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ibufsize) {
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warnx("can't write inodes: %s",
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(n != ibufsize) ? "short write" :
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strerror(errno));
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return (1);
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}
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}
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}
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(void)close(devfd);
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return(0);
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}
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static void
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usage(void)
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{
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(void)fprintf(stderr,
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"usage: fsirand [-b] [-f] [-p] special [special ...]\n");
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exit(1);
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}
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