/*      $OpenBSD: setup.c,v 1.36 2025/09/17 16:07:57 deraadt Exp $      */
/*      $NetBSD: setup.c,v 1.1 1997/06/11 11:22:01 bouyer Exp $ */

/*
 * Copyright (c) 1997 Manuel Bouyer.
 * Copyright (c) 1980, 1986, 1993
 *      The Regents of the University of California.  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. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
 */

#define DKTYPENAMES
#include <sys/param.h>  /* DEV_BSIZE roundup */
#include <sys/time.h>
#include <ufs/ext2fs/ext2fs_dinode.h>
#include <ufs/ext2fs/ext2fs.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/dkio.h>
#include <sys/disklabel.h>

#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <util.h>
#include <string.h>
#include <ctype.h>
#include <err.h>

#include "fsck.h"
#include "extern.h"
#include "fsutil.h"

#define POWEROF2(num)   (((num) & ((num) - 1)) == 0)

void badsb(int, char *);
int calcsb(char *, int, struct m_ext2fs *, struct disklabel *);
static struct disklabel *getdisklabel(char *, int);
static int readsb(int);
static char rdevname[PATH_MAX];

int
setup(char *dev)
{
        long cg, asked, i;
        long bmapsize;
        struct disklabel *lp;
        off_t sizepb;
        struct stat statb;
        struct m_ext2fs proto;
        char *realdev;
        int doskipclean;
        u_int64_t maxfilesize;

        havesb = 0;
        fswritefd = -1;
        doskipclean = skipclean;
        if ((fsreadfd = opendev(dev, O_RDONLY, 0, &realdev)) == -1) {
                printf("Can't open %s: %s\n", dev, strerror(errno));
                return (0);
        }
        if (strncmp(dev, realdev, PATH_MAX) != 0) {
                blockcheck(unrawname(realdev));
                strlcpy(rdevname, realdev, sizeof(rdevname));
                setcdevname(rdevname, dev, preen);
        }
        if (fstat(fsreadfd, &statb) == -1) {
                printf("Can't stat %s: %s\n", realdev, strerror(errno));
                return (0);
        }
        if (!S_ISCHR(statb.st_mode)) {
                pfatal("%s is not a character device", realdev);
                if (reply("CONTINUE") == 0) {
                        close(fsreadfd);
                        return (0);
                }
        }
        if (preen == 0)
                printf("** %s", realdev);
        if (nflag || (fswritefd = opendev(dev, O_WRONLY, 0, NULL)) == -1) {
                fswritefd = -1;
                if (preen)
                        pfatal("NO WRITE ACCESS");
                printf(" (NO WRITE)");
        }
        if (preen == 0)
                printf("\n");
        fsmodified = 0;
        lfdir = 0;
        initbarea(&sblk);
        initbarea(&asblk);
        sblk.b_un.b_buf = malloc(SBSIZE);
        asblk.b_un.b_buf = malloc(SBSIZE);
        if (sblk.b_un.b_buf == NULL || asblk.b_un.b_buf == NULL)
                errexit("cannot allocate space for superblock\n");
        if ((lp = getdisklabel(NULL, fsreadfd)) != NULL)
                secsize = lp->d_secsize;
        else
                secsize = DEV_BSIZE;

        if (!hotroot()) {
#ifndef SMALL
                if (pledge("stdio getpw", NULL) == -1)
                        err(1, "pledge");
#else
                if (pledge("stdio", NULL) == -1)
                        err(1, "pledge");
#endif
        }

        /*
         * Read in the superblock, looking for alternates if necessary
         */
        if (readsb(1) == 0) {
                if (bflag || preen || calcsb(realdev, fsreadfd, &proto, lp) == 0)
                        return(0);
                if (reply("LOOK FOR ALTERNATE SUPERBLOCKS") == 0)
                        return (0);
                for (cg = 1; cg < proto.e2fs_ncg; cg++) {
                        bflag = fsbtodb(&proto,
                                cg * proto.e2fs.e2fs_bpg + proto.e2fs.e2fs_first_dblock);
                        if (readsb(0) != 0)
                                break;
                }
                if (cg >= proto.e2fs_ncg) {
                        printf("%s %s\n%s %s\n%s %s\n",
                            "SEARCH FOR ALTERNATE SUPER-BLOCK",
                            "FAILED. YOU MUST USE THE",
                            "-b OPTION TO FSCK_FFS TO SPECIFY THE",
                            "LOCATION OF AN ALTERNATE",
                            "SUPER-BLOCK TO SUPPLY NEEDED",
                            "INFORMATION; SEE fsck_ext2fs(8).");
                        return(0);
                }
                doskipclean = 0;
                pwarn("USING ALTERNATE SUPERBLOCK AT %d\n", bflag);
        }
        if (debug)
                printf("state = %d\n", sblock.e2fs.e2fs_state);
        if (sblock.e2fs.e2fs_state == E2FS_ISCLEAN) {
                if (doskipclean) {
                        pwarn("%sile system is clean; not checking\n",
                            preen ? "f" : "** F");
                        return (-1);
                }
                if (!preen)
                        pwarn("** File system is already clean\n");
        }
        maxfsblock = sblock.e2fs.e2fs_bcount;
        maxino = sblock.e2fs_ncg * sblock.e2fs.e2fs_ipg;
        sizepb = sblock.e2fs_bsize;
        maxfilesize = sblock.e2fs_bsize * NDADDR - 1;
        for (i = 0; i < NIADDR; i++) {
                sizepb *= NINDIR(&sblock);
                maxfilesize += sizepb;
        }
        /*
         * Check and potentially fix certain fields in the super block.
         */
        if (/* (sblock.e2fs.e2fs_rbcount < 0) || */
                        (sblock.e2fs.e2fs_rbcount > sblock.e2fs.e2fs_bcount)) {
                pfatal("IMPOSSIBLE RESERVED BLOCK COUNT=%d IN SUPERBLOCK",
                        sblock.e2fs.e2fs_rbcount);
                if (reply("SET TO DEFAULT") == 1) {
                        sblock.e2fs.e2fs_rbcount = sblock.e2fs.e2fs_bcount * 0.1;
                        sbdirty();
                        dirty(&asblk);
                }
        }
        if (sblock.e2fs.e2fs_bpg != sblock.e2fs.e2fs_fpg) {
                pfatal("WRONG FPG=%d (BPG=%d) IN SUPERBLOCK",
                        sblock.e2fs.e2fs_fpg, sblock.e2fs.e2fs_bpg);
                return 0;
        }
        if (asblk.b_dirty && !bflag) {
                copyback_sb(&asblk);
                flush(fswritefd, &asblk);
        }
        /*
         * read in the summary info.
         */

        sblock.e2fs_gd = calloc(sblock.e2fs_ngdb, sblock.e2fs_bsize);
        if (sblock.e2fs_gd == NULL)
                errexit("out of memory\n");
        asked = 0;
        for (i=0; i < sblock.e2fs_ngdb; i++) {
                if (bread(fsreadfd,(char *)
                        &sblock.e2fs_gd[i* sblock.e2fs_bsize / sizeof(struct ext2_gd)],
                        fsbtodb(&sblock, ((sblock.e2fs_bsize>1024)?0:1)+i+1),
                        sblock.e2fs_bsize) != 0 && !asked) {
                        pfatal("BAD SUMMARY INFORMATION");
                        if (reply("CONTINUE") == 0)
                                errexit("%s\n", "");
                        asked++;
                }
        }
        /*
         * allocate and initialize the necessary maps
         */
        bmapsize = roundup(howmany(maxfsblock, NBBY), sizeof(int16_t));
        blockmap = calloc((unsigned)bmapsize, sizeof (char));
        if (blockmap == NULL) {
                printf("cannot alloc %u bytes for blockmap\n",
                        (unsigned)bmapsize);
                goto badsblabel;
        }
        statemap = calloc((unsigned)(maxino + 2), sizeof(char));
        if (statemap == NULL) {
                printf("cannot alloc %u bytes for statemap\n",
                        (unsigned)(maxino + 1));
                goto badsblabel;
        }
        typemap = calloc((unsigned)(maxino + 1), sizeof(u_char));
        if (typemap == NULL) {
                printf("cannot alloc %u bytes for typemap\n",
                    (unsigned)(maxino + 1));
                goto badsblabel;
        }
        lncntp = calloc((unsigned)(maxino + 1), sizeof(int16_t));
        if (lncntp == NULL) {
                printf("cannot alloc %u bytes for lncntp\n",
                        (unsigned)((maxino + 1) * sizeof(int16_t)));
                goto badsblabel;
        }
        for (numdirs = 0, cg = 0; cg < sblock.e2fs_ncg; cg++) {
                numdirs += letoh16(sblock.e2fs_gd[cg].ext2bgd_ndirs);
        }
        inplast = 0;
        listmax = numdirs + 10;
        inpsort = calloc((unsigned)listmax, sizeof(struct inoinfo *));
        inphead = calloc((unsigned)numdirs, sizeof(struct inoinfo *));
        if (inpsort == NULL || inphead == NULL) {
                printf("cannot alloc %u bytes for inphead\n",
                        (unsigned)(numdirs * sizeof(struct inoinfo *)));
                goto badsblabel;
        }
        bufinit();
        return (1);

badsblabel:
        ckfini(0);
        return (0);
}

/*
 * Read in the super block and its summary info.
 */
static int
readsb(int listerr)
{
        daddr32_t super = bflag ? bflag : SBOFF / DEV_BSIZE;

        if (bread(fsreadfd, (char *)sblk.b_un.b_fs, super, (long)SBSIZE) != 0)
                return (0);
        sblk.b_bno = super;
        sblk.b_size = SBSIZE;

        /* Copy the superblock in memory */
        e2fs_sbload(sblk.b_un.b_fs, &sblock.e2fs);

        /*
         * run a few consistency checks of the super block
         */
        if (sblock.e2fs.e2fs_magic != E2FS_MAGIC) {
                badsb(listerr, "MAGIC NUMBER WRONG"); return (0);
        }
        if (sblock.e2fs.e2fs_log_bsize > 2) {
                badsb(listerr, "BAD LOG_BSIZE"); return (0);
        }
        if (sblock.e2fs.e2fs_bpg == 0) {
                badsb(listerr, "BAD BLOCKS PER GROUP"); return (0);
        }

        /* compute the dynamic fields of the in-memory sb */
        /* compute dynamic sb infos */
        sblock.e2fs_ncg =
                howmany(sblock.e2fs.e2fs_bcount - sblock.e2fs.e2fs_first_dblock,
                sblock.e2fs.e2fs_bpg);
        /* XXX assume hw bsize = 512 */
        sblock.e2fs_fsbtodb = sblock.e2fs.e2fs_log_bsize + 1;
        sblock.e2fs_bsize = 1024 << sblock.e2fs.e2fs_log_bsize;
        sblock.e2fs_bshift = LOG_MINBSIZE + sblock.e2fs.e2fs_log_bsize;
        sblock.e2fs_qbmask = sblock.e2fs_bsize - 1;
        sblock.e2fs_bmask = ~sblock.e2fs_qbmask;
        sblock.e2fs_ngdb = howmany(sblock.e2fs_ncg,
                sblock.e2fs_bsize / sizeof(struct ext2_gd));
        sblock.e2fs_ipb = sblock.e2fs_bsize / EXT2_DINODE_SIZE(&sblock);
        sblock.e2fs_itpg = sblock.e2fs.e2fs_ipg/sblock.e2fs_ipb;

        /*
         * Compute block size that the filesystem is based on,
         * according to fsbtodb, and adjust superblock block number
         * so we can tell if this is an alternate later.
         */
        sblk.b_bno = super / DEV_BSIZE;

        if (sblock.e2fs_ncg == 1) {
                /* no alternate superblock; assume it's okey */
                havesb = 1;
                return 1;
        }

        getblk(&asblk, 1 * sblock.e2fs.e2fs_bpg + sblock.e2fs.e2fs_first_dblock,
                (long)SBSIZE);
        if (asblk.b_errs)
                return (0);
        if (bflag) {
                havesb = 1;
                return (1);
        }

        /*
         * Set all possible fields that could differ, then do check
         * of whole super block against an alternate super block.
         * When an alternate super-block is specified this check is skipped.
         */
        asblk.b_un.b_fs->e2fs_rbcount = sblk.b_un.b_fs->e2fs_rbcount;
        asblk.b_un.b_fs->e2fs_fbcount = sblk.b_un.b_fs->e2fs_fbcount;
        asblk.b_un.b_fs->e2fs_ficount = sblk.b_un.b_fs->e2fs_ficount;
        asblk.b_un.b_fs->e2fs_mtime = sblk.b_un.b_fs->e2fs_mtime;
        asblk.b_un.b_fs->e2fs_wtime = sblk.b_un.b_fs->e2fs_wtime;
        asblk.b_un.b_fs->e2fs_mnt_count = sblk.b_un.b_fs->e2fs_mnt_count;
        asblk.b_un.b_fs->e2fs_max_mnt_count = sblk.b_un.b_fs->e2fs_max_mnt_count;
        asblk.b_un.b_fs->e2fs_state = sblk.b_un.b_fs->e2fs_state;
        asblk.b_un.b_fs->e2fs_beh = sblk.b_un.b_fs->e2fs_beh;
        asblk.b_un.b_fs->e2fs_lastfsck = sblk.b_un.b_fs->e2fs_lastfsck;
        asblk.b_un.b_fs->e2fs_fsckintv = sblk.b_un.b_fs->e2fs_fsckintv;
        asblk.b_un.b_fs->e2fs_ruid = sblk.b_un.b_fs->e2fs_ruid;
        asblk.b_un.b_fs->e2fs_rgid = sblk.b_un.b_fs->e2fs_rgid;
        asblk.b_un.b_fs->e2fs_block_group_nr =
            sblk.b_un.b_fs->e2fs_block_group_nr;
        asblk.b_un.b_fs->e2fs_features_rocompat &= ~EXT2F_ROCOMPAT_LARGE_FILE;
        asblk.b_un.b_fs->e2fs_features_rocompat |=
            sblk.b_un.b_fs->e2fs_features_rocompat & EXT2F_ROCOMPAT_LARGE_FILE;
        memcpy(asblk.b_un.b_fs->e2fs_fsmnt, sblk.b_un.b_fs->e2fs_fsmnt,
            sizeof(sblk.b_un.b_fs->e2fs_fsmnt));
        asblk.b_un.b_fs->e2fs_kbytes_written = sblk.b_un.b_fs->e2fs_kbytes_written;

        if (sblock.e2fs.e2fs_rev > E2FS_REV0 &&
            ((sblock.e2fs.e2fs_features_incompat & ~EXT2F_INCOMPAT_SUPP) ||
            (sblock.e2fs.e2fs_features_rocompat & ~EXT2F_ROCOMPAT_SUPP))) {
                if (debug) {
                        printf("compat 0x%08x, incompat 0x%08x, compat_ro "
                            "0x%08x\n",
                            sblock.e2fs.e2fs_features_compat,
                            sblock.e2fs.e2fs_features_incompat,
                            sblock.e2fs.e2fs_features_rocompat);
                }
                badsb(listerr,"INCOMPATIBLE FEATURE BITS IN SUPER BLOCK");
                return 0;
        }
        if (memcmp(sblk.b_un.b_fs, asblk.b_un.b_fs, SBSIZE)) {
                if (debug) {
                        u_int32_t *nlp, *olp, *endlp;

                        printf("superblock mismatches\n");
                        nlp = (u_int32_t *)asblk.b_un.b_fs;
                        olp = (u_int32_t *)sblk.b_un.b_fs;
                        endlp = olp + (SBSIZE / sizeof *olp);
                        for ( ; olp < endlp; olp++, nlp++) {
                                if (*olp == *nlp)
                                        continue;
                                printf("offset %ld, original %ld, alternate %ld\n",
                                        (long)(olp - (u_int32_t *)sblk.b_un.b_fs),
                                        (long)letoh32(*olp),
                                        (long)letoh32(*nlp));
                        }
                }
                badsb(listerr,
                "VALUES IN SUPER BLOCK DISAGREE WITH THOSE IN FIRST ALTERNATE");
                return (0);
        }
        havesb = 1;
        return (1);
}

void
copyback_sb(struct bufarea *bp)
{
        /* Copy the in-memory superblock back to buffer */
        bp->b_un.b_fs->e2fs_icount = letoh32(sblock.e2fs.e2fs_icount);
        bp->b_un.b_fs->e2fs_bcount = letoh32(sblock.e2fs.e2fs_bcount);
        bp->b_un.b_fs->e2fs_rbcount = letoh32(sblock.e2fs.e2fs_rbcount);
        bp->b_un.b_fs->e2fs_fbcount = letoh32(sblock.e2fs.e2fs_fbcount);
        bp->b_un.b_fs->e2fs_ficount = letoh32(sblock.e2fs.e2fs_ficount);
        bp->b_un.b_fs->e2fs_first_dblock =
                                        letoh32(sblock.e2fs.e2fs_first_dblock);
        bp->b_un.b_fs->e2fs_log_bsize = letoh32(sblock.e2fs.e2fs_log_bsize);
        bp->b_un.b_fs->e2fs_log_fsize = letoh32(sblock.e2fs.e2fs_log_fsize);
        bp->b_un.b_fs->e2fs_bpg = letoh32(sblock.e2fs.e2fs_bpg);
        bp->b_un.b_fs->e2fs_fpg = letoh32(sblock.e2fs.e2fs_fpg);
        bp->b_un.b_fs->e2fs_ipg = letoh32(sblock.e2fs.e2fs_ipg);
        bp->b_un.b_fs->e2fs_mtime = letoh32(sblock.e2fs.e2fs_mtime);
        bp->b_un.b_fs->e2fs_wtime = letoh32(sblock.e2fs.e2fs_wtime);
        bp->b_un.b_fs->e2fs_lastfsck = letoh32(sblock.e2fs.e2fs_lastfsck);
        bp->b_un.b_fs->e2fs_fsckintv = letoh32(sblock.e2fs.e2fs_fsckintv);
        bp->b_un.b_fs->e2fs_creator = letoh32(sblock.e2fs.e2fs_creator);
        bp->b_un.b_fs->e2fs_rev = letoh32(sblock.e2fs.e2fs_rev);
        bp->b_un.b_fs->e2fs_mnt_count = letoh16(sblock.e2fs.e2fs_mnt_count);
        bp->b_un.b_fs->e2fs_max_mnt_count =
                                        letoh16(sblock.e2fs.e2fs_max_mnt_count);
        bp->b_un.b_fs->e2fs_magic = letoh16(sblock.e2fs.e2fs_magic);
        bp->b_un.b_fs->e2fs_state = letoh16(sblock.e2fs.e2fs_state);
        bp->b_un.b_fs->e2fs_beh = letoh16(sblock.e2fs.e2fs_beh);
        bp->b_un.b_fs->e2fs_ruid = letoh16(sblock.e2fs.e2fs_ruid);
        bp->b_un.b_fs->e2fs_rgid = letoh16(sblock.e2fs.e2fs_rgid);
}

void
badsb(int listerr, char *s)
{

        if (!listerr)
                return;
        if (preen)
                printf("%s: ", cdevname());
        pfatal("BAD SUPER BLOCK: %s\n", s);
}

/*
 * Calculate a prototype superblock based on information in the disk label.
 * When done the cgsblock macro can be calculated and the fs_ncg field
 * can be used. Do NOT attempt to use other macros without verifying that
 * their needed information is available!
 */
int
calcsb(char *dev, int devfd, struct m_ext2fs *fs, struct disklabel *lp)
{
        struct partition *pp;
        char *cp;

        cp = strchr(dev, '\0');
        if ((cp == NULL || DL_PARTNAME2NUM(cp[-1]) == -1) &&
            !isdigit((unsigned char)cp[-1])) {
                pfatal("%s: CANNOT FIGURE OUT FILE SYSTEM PARTITION\n", dev);
                return (0);
        }
        cp--;
        if (lp == NULL)
                pfatal("%s: CANNOT READ DISKLABEL\n", dev);
        if (isdigit((unsigned char)*cp))
                pp = &lp->d_partitions[0];
        else
                pp = &lp->d_partitions[DL_PARTNAME2NUM(*cp)];
        if (pp->p_fstype != FS_EXT2FS) {
                pfatal("%s: NOT LABELED AS A EXT2 FILE SYSTEM (%s)\n",
                        dev, pp->p_fstype < FSMAXTYPES ?
                        fstypenames[pp->p_fstype] : "unknown");
                return (0);
        }
        memset(fs, 0, sizeof(struct m_ext2fs));
        fs->e2fs_bsize = DISKLABELV1_FFS_FSIZE(pp->p_fragblock); /* XXX */
        if (fs->e2fs_bsize == 0) {
                pfatal("%s: BLOCK SIZE DETERMINED TO BE ZERO\n", dev);
                return (0);
        }
        fs->e2fs.e2fs_log_bsize = fs->e2fs_bsize / 1024;
        fs->e2fs.e2fs_bcount = (pp->p_size * DEV_BSIZE) / fs->e2fs_bsize;
        fs->e2fs.e2fs_first_dblock = (fs->e2fs.e2fs_log_bsize == 0) ? 1 : 0;
        fs->e2fs.e2fs_bpg = fs->e2fs_bsize * NBBY;
        fs->e2fs_bshift = LOG_MINBSIZE + fs->e2fs.e2fs_log_bsize;
        fs->e2fs_qbmask = fs->e2fs_bsize - 1;
        fs->e2fs_bmask = ~fs->e2fs_qbmask;
        fs->e2fs_ncg =
                howmany(fs->e2fs.e2fs_bcount - fs->e2fs.e2fs_first_dblock,
                fs->e2fs.e2fs_bpg);
        fs->e2fs_fsbtodb = fs->e2fs.e2fs_log_bsize + 1;
        fs->e2fs_ngdb = howmany(fs->e2fs_ncg,
                fs->e2fs_bsize / sizeof(struct ext2_gd));

        return (1);
}

static struct disklabel *
getdisklabel(char *s, int fd)
{
        static struct disklabel lab;

        if (ioctl(fd, DIOCGDINFO, (char *)&lab) == -1) {
                if (s == NULL)
                        return (NULL);
                pwarn("ioctl (GCINFO): %s\n", strerror(errno));
                errexit("%s: can't read disk label\n", s);
        }
        return (&lab);
}

daddr32_t
cgoverhead(int c)
{
        int overh;
        overh = 1 /* block bitmap */ +
                1 /* inode bitmap */ +
                sblock.e2fs_itpg;
        if (sblock.e2fs.e2fs_rev > E2FS_REV0 &&
            sblock.e2fs.e2fs_features_rocompat & EXT2F_ROCOMPAT_SPARSE_SUPER) {
                if (cg_has_sb(c) == 0)
                        return overh;
        }
        overh += 1 + sblock.e2fs_ngdb;
        return overh;
}