334 lines
8.7 KiB
C
334 lines
8.7 KiB
C
/* $OpenBSD: fsirand.c,v 1.44 2024/05/09 08:35:40 florian Exp $ */
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/*
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* Copyright (c) 1997 Todd C. Miller <millert@openbsd.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <sys/param.h> /* DEV_BSIZE */
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#include <sys/disklabel.h>
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#include <sys/ioctl.h>
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#include <sys/dkio.h>
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#include <sys/resource.h>
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#include <sys/time.h>
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#include <ufs/ffs/fs.h>
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#include <ufs/ufs/dinode.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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#include <util.h>
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void usage(int);
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int fsirand(char *);
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extern char *__progname;
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int printonly = 0, force = 0, ignorelabel = 0;
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/*
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* Possible locations for the superblock.
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*/
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static const int sbtry[] = SBLOCKSEARCH;
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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 = 1;
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break;
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case 'p':
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printonly = 1;
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break;
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case 'f':
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force = 1;
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break;
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default:
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usage(1);
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}
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}
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if (argc - optind < 1)
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usage(1);
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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) == -1)
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warn("Can't set 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 = NULL;
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struct ufs2_dinode *dp2 = NULL;
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static char *inodebuf;
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size_t ibufsize, isize;
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struct fs *sblock, *tmpsblock;
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ino_t inumber;
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daddr_t sblockloc, dblk;
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char sbuf[SBSIZE], sbuftmp[SBSIZE];
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int devfd, n, i;
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u_int cg;
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char *devpath, *ib;
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u_int32_t bsize = DEV_BSIZE;
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struct disklabel label;
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if ((devfd = opendev(device, printonly ? O_RDONLY : O_RDWR,
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0, &devpath)) == -1) {
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warn("Can't open %s", devpath);
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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) == -1)
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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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if (pledge("stdio", NULL) == -1)
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err(1, "pledge");
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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; sbtry[i] != -1; i++) {
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sblockloc = sbtry[i];
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if (lseek(devfd, sblockloc, SEEK_SET) == -1) {
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warn("Can't seek to superblock (%lld) on %s",
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(long long)sblockloc, devpath);
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return (1);
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}
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if ((n = read(devfd, sblock, SBSIZE)) != SBSIZE) {
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warnx("Can't read superblock on %s: %s", devpath,
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(n < SBSIZE) ? "short read" : strerror(errno));
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return (1);
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}
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/* Find a suitable superblock */
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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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continue; /* Not a superblock */
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/*
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* Do not look for an FFS1 file system at SBLOCK_UFS2.
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* Doing so will find the wrong super-block for file
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* systems with 64k block size.
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*/
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if (sblock->fs_magic == FS_UFS1_MAGIC &&
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sbtry[i] == SBLOCK_UFS2)
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continue;
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if (sblock->fs_magic == FS_UFS2_MAGIC &&
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sblock->fs_sblockloc != sbtry[i])
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continue; /* Not a superblock */
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break;
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}
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if (sbtry[i] == -1) {
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warnx("Cannot find file system superblock");
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return (1);
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}
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/* Simple sanity checks on the superblock */
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if (sblock->fs_sbsize > SBSIZE) {
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warnx("Superblock size is preposterous");
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return (1);
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}
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if (sblock->fs_postblformat == FS_42POSTBLFMT) {
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warnx("Filesystem 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 != FS_ISCLEAN) {
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warnx("Filesystem is not clean, fsck %s first.", devpath);
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return (1);
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}
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/* Make sure backup superblocks are sane. */
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tmpsblock = (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) == -1) {
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warn("Can't seek to %lld", (long long)dblk * bsize);
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return (1);
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} else if ((n = read(devfd, tmpsblock, SBSIZE)) != SBSIZE) {
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warn("Can't read backup superblock %d on %s: %s",
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cg + 1, devpath, (n < SBSIZE) ? "short read"
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: strerror(errno));
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return (1);
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}
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if (tmpsblock->fs_magic != FS_UFS1_MAGIC &&
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tmpsblock->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, devpath);
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return (1);
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}
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if (tmpsblock->fs_sbsize > SBSIZE) {
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warnx("Size of backup superblock %d on %s is preposterous",
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cg + 1, devpath);
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return (1);
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}
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}
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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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isize = sizeof(struct ufs1_dinode);
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else
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isize = sizeof(struct ufs2_dinode);
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if ((ib = reallocarray(inodebuf, sblock->fs_ipg, isize)) == NULL)
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errx(1, "Can't allocate memory for inode buffer");
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inodebuf = ib;
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ibufsize = sblock->fs_ipg * isize;
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if (printonly && (sblock->fs_id[0] || sblock->fs_id[1])) {
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if (sblock->fs_inodefmt >= FS_44INODEFMT && sblock->fs_id[0]) {
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time_t t = sblock->fs_id[0]; /* XXX 2038 */
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char *ct = ctime(&t);
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if (ct)
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(void)printf("%s was randomized on %s", devpath,
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ct);
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else
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(void)printf("%s was randomized on %lld\n",
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devpath, t);
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}
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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 filesystem */
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if ((sblock->fs_inodefmt >= FS_44INODEFMT) && !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] = arc4random();
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if (lseek(devfd, SBOFF, SEEK_SET) == -1) {
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warn("Can't seek to superblock (%lld) on %s",
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(long long)SBOFF, devpath);
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return (1);
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}
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if ((n = write(devfd, sblock, SBSIZE)) != SBSIZE) {
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warn("Can't write superblock on %s: %s", devpath,
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(n < SBSIZE) ? "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 ((sblock->fs_inodefmt >= FS_44INODEFMT) && !printonly) {
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dblk = fsbtodb(sblock, cgsblock(sblock, cg));
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if (lseek(devfd, (off_t)dblk * bsize,
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SEEK_SET) == -1) {
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warn("Can't seek to %lld",
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(long long)dblk * bsize);
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return (1);
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} else if ((n = write(devfd, sblock, SBSIZE)) !=
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SBSIZE) {
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warn("Can't read backup superblock %d on %s: %s",
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cg + 1, devpath, (n < SBSIZE) ? "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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/* 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) == -1) {
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warn("Can't seek to %lld", (long long)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 %llu gen %x\n",
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(unsigned long long)inumber,
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sblock->fs_magic == FS_UFS1_MAGIC ?
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dp1->di_gen : dp2->di_gen);
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else if (sblock->fs_magic == FS_UFS1_MAGIC)
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dp1->di_gen = arc4random();
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else
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dp2->di_gen = arc4random();
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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) == -1) {
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warn("Can't seek to %lld",
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(long long)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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void
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usage(int ex)
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{
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(void)fprintf(stderr, "usage: %s [-bfp] special ...\n",
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__progname);
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exit(ex);
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}
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