/*      $OpenBSD: fsirand.c,v 1.9 1997/02/28 00:46:33 millert Exp $     */

/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com>
 * 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.
 */

#include <sys/param.h>
#include <sys/resource.h>

#include <ufs/ufs/dinode.h>
#include <ufs/ffs/fs.h>

#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <libufs.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>

static void usage(void) __dead2;
int fsirand(char *);

static int printonly = 0, force = 0, ignorelabel = 0;

int
main(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();
                }
        }
        if (argc - optind < 1)
                usage();

        /* 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(char *device)
{
        struct ufs1_dinode *dp1;
        struct ufs2_dinode *dp2;
        caddr_t inodebuf;
        ssize_t ibufsize;
        struct fs *sblock;
        ino_t inumber;
        ufs2_daddr_t dblk;
        int devfd, n, cg;
        u_int32_t bsize = DEV_BSIZE;

        if ((devfd = open(device, printonly ? O_RDONLY : O_RDWR)) < 0) {
                warn("can't open %s", device);
                return (1);
        }

        dp1 = NULL;
        dp2 = NULL;

        /* Read in master superblock */
        if ((errno = sbget(devfd, &sblock, UFS_STDSB, UFS_NOCSUM)) != 0) {
                switch (errno) {
                case ENOENT:
                        warnx("Cannot find file system superblock");
                        return (1);
                default:
                        warn("Unable to read file system superblock");
                        return (1);
                }
        }
        /*
         * Check for unclean filesystem.
         */
        if (sblock->fs_clean == 0 ||
            (sblock->fs_flags & (FS_UNCLEAN | FS_NEEDSFSCK)) != 0)
                errx(1, "%s is not clean - run fsck.\n", device);

        if (sblock->fs_magic == FS_UFS1_MAGIC &&
            sblock->fs_old_inodefmt < FS_44INODEFMT) {
                warnx("file system format is too old, sorry");
                return (1);
        }
        if (!force && !printonly && sblock->fs_clean != 1) {
                warnx("file system is not clean, fsck %s first", device);
                return (1);
        }

        /* XXX - should really cap buffer at 512kb or so */
        if (sblock->fs_magic == FS_UFS1_MAGIC)
                ibufsize = sizeof(struct ufs1_dinode) * sblock->fs_ipg;
        else
                ibufsize = sizeof(struct ufs2_dinode) * sblock->fs_ipg;
        if ((inodebuf = malloc(ibufsize)) == NULL)
                errx(1, "can't allocate memory for inode buffer");

        if (printonly && (sblock->fs_id[0] || sblock->fs_id[1])) {
                if (sblock->fs_id[0])
                        (void)printf("%s was randomized on %s", device,
                            ctime((void *)&(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 file system */
        if (!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 (sbput(devfd, sblock, sblock->fs_ncg) != 0) {
                        warn("could not write updated superblock");
                        return (1);
                }
        }

        /* For each cylinder group, randomize inodes and update backup sblock */
        for (cg = 0, inumber = UFS_ROOTINO; cg < (int)sblock->fs_ncg; cg++) {
                /* 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 %jd", (intmax_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);
                }

                dp1 = (struct ufs1_dinode *)(void *)inodebuf;
                dp2 = (struct ufs2_dinode *)(void *)inodebuf;
                for (n = cg > 0 ? 0 : UFS_ROOTINO;
                     n < (int)sblock->fs_ipg;
                     n++, inumber++) {
                        if (printonly) {
                                (void)printf("ino %ju gen %08x\n",
                                    (uintmax_t)inumber,
                                    sblock->fs_magic == FS_UFS1_MAGIC ?
                                    dp1->di_gen : dp2->di_gen);
                        } else if (sblock->fs_magic == FS_UFS1_MAGIC) {
                                dp1->di_gen = arc4random(); 
                                dp1++;
                        } else {
                                dp2->di_gen = arc4random();
                                ffs_update_dinode_ckhash(sblock, dp2);
                                dp2++;
                        }
                }

                /* Write out modified inodes */
                if (!printonly) {
                        if (lseek(devfd, (off_t)dblk * bsize, SEEK_SET) < 0) {
                                warn("can't seek to %jd",
                                    (intmax_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);
}

static void
usage(void)
{
        (void)fprintf(stderr, 
                "usage: fsirand [-b] [-f] [-p] special [special ...]\n");
        exit(1);
}