/*      $OpenBSD: pass2.c,v 1.16 2019/12/17 19:41:51 millert Exp $      */
/*      $NetBSD: pass2.c,v 1.6 2000/01/28 16:01:46 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.
 */

#include <sys/param.h>  /* roundup */
#include <sys/time.h>
#include <ufs/ext2fs/ext2fs_dinode.h>
#include <ufs/ext2fs/ext2fs_dir.h>
#include <ufs/ext2fs/ext2fs.h>

#include <ufs/ufs/dinode.h> /* for IFMT & friends */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>

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

#define MINDIRSIZE      (sizeof (struct ext2fs_dirtemplate))

static int pass2check(struct inodesc *);
static int blksort(const void *, const void *);

void
pass2(void)
{
        struct ext2fs_dinode *dp;
        struct inoinfo **inpp, *inp;
        struct inoinfo **inpend;
        struct inodesc curino;
        struct ext2fs_dinode dino;
        char pathbuf[PATH_MAX + 1];

        switch (statemap[EXT2_ROOTINO]) {

        case USTATE:
                pfatal("ROOT INODE UNALLOCATED");
                if (reply("ALLOCATE") == 0)
                        errexit("%s\n", "");
                if (allocdir(EXT2_ROOTINO, EXT2_ROOTINO, 0755) != EXT2_ROOTINO)
                        errexit("CANNOT ALLOCATE ROOT INODE\n");
                break;

        case DCLEAR:
                pfatal("DUPS/BAD IN ROOT INODE");
                if (reply("REALLOCATE")) {
                        freeino(EXT2_ROOTINO);
                        if (allocdir(EXT2_ROOTINO, EXT2_ROOTINO, 0755) != EXT2_ROOTINO)
                                errexit("CANNOT ALLOCATE ROOT INODE\n");
                        break;
                }
                if (reply("CONTINUE") == 0)
                        errexit("%s\n", "");
                break;

        case FSTATE:
        case FCLEAR:
                pfatal("ROOT INODE NOT DIRECTORY");
                if (reply("REALLOCATE")) {
                        freeino(EXT2_ROOTINO);
                        if (allocdir(EXT2_ROOTINO, EXT2_ROOTINO, 0755) != EXT2_ROOTINO)
                                errexit("CANNOT ALLOCATE ROOT INODE\n");
                        break;
                }
                if (reply("FIX") == 0)
                        errexit("%s\n", "");
                dp = ginode(EXT2_ROOTINO);
                dp->e2di_mode = htole16((letoh16(dp->e2di_mode) & ~IFMT) | IFDIR);
                inodirty();
                break;

        case DSTATE:
                break;

        default:
                errexit("BAD STATE %d FOR ROOT INODE\n", statemap[EXT2_ROOTINO]);
        }

        /*
         * Sort the directory list into disk block order.
         */
        qsort((char *)inpsort, (size_t)inplast, sizeof *inpsort, blksort);
        /*
         * Check the integrity of each directory.
         */
        memset(&curino, 0, sizeof(struct inodesc));
        curino.id_type = DATA;
        curino.id_func = pass2check;
        inpend = &inpsort[inplast];
        for (inpp = inpsort; inpp < inpend; inpp++) {
                inp = *inpp;
                if (inp->i_isize == 0)
                        continue;
                if (inp->i_isize < MINDIRSIZE) {
                        direrror(inp->i_number, "DIRECTORY TOO SHORT");
                        inp->i_isize = roundup(MINDIRSIZE, sblock.e2fs_bsize);
                        if (reply("FIX") == 1) {
                                dp = ginode(inp->i_number);
                                inossize(dp, inp->i_isize);
                                inodirty();
                        }
                } else if ((inp->i_isize & (sblock.e2fs_bsize - 1)) != 0) {
                        getpathname(pathbuf, sizeof pathbuf, inp->i_number,
                            inp->i_number);
                        pwarn("DIRECTORY %s: LENGTH %lu NOT MULTIPLE OF %d",
                            pathbuf, (u_long)inp->i_isize, sblock.e2fs_bsize);
                        if (preen)
                                printf(" (ADJUSTED)\n");
                        inp->i_isize = roundup(inp->i_isize, sblock.e2fs_bsize);
                        if (preen || reply("ADJUST") == 1) {
                                dp = ginode(inp->i_number);
                                inossize(dp, inp->i_isize);
                                inodirty();
                        }
                }
                memset(&dino, 0, sizeof(dino));
                dino.e2di_mode = htole16(IFDIR);
                inossize(&dino, inp->i_isize);
                memcpy(&dino.e2di_blocks[0], &inp->i_blks[0], (size_t)inp->i_numblks);
                curino.id_number = inp->i_number;
                curino.id_parent = inp->i_parent;
                (void)ckinode(&dino, &curino);
        }
        /*
         * Now that the parents of all directories have been found,
         * make another pass to verify the value of `..'
         */
        for (inpp = inpsort; inpp < inpend; inpp++) {
                inp = *inpp;
                if (inp->i_parent == 0 || inp->i_isize == 0)
                        continue;
                if (inp->i_dotdot == inp->i_parent ||
                    inp->i_dotdot == (ino_t)-1)
                        continue;
                if (inp->i_dotdot == 0) {
                        inp->i_dotdot = inp->i_parent;
                        fileerror(inp->i_parent, inp->i_number, "MISSING '..'");
                        if (reply("FIX") == 0)
                                continue;
                        (void)makeentry(inp->i_number, inp->i_parent, "..");
                        lncntp[inp->i_parent]--;
                        continue;
                }
                fileerror(inp->i_parent, inp->i_number,
                    "BAD INODE NUMBER FOR '..'");
                if (reply("FIX") == 0)
                        continue;
                lncntp[inp->i_dotdot]++;
                lncntp[inp->i_parent]--;
                inp->i_dotdot = inp->i_parent;
                (void)changeino(inp->i_number, "..", inp->i_parent);
        }
        /*
         * Mark all the directories that can be found from the root.
         */
        propagate();
}

static int
pass2check(struct inodesc *idesc)
{
        struct ext2fs_direct *dirp = idesc->id_dirp;
        struct inoinfo *inp;
        int n, entrysize, ret = 0;
        struct ext2fs_dinode *dp;
        char *errmsg;
        struct ext2fs_direct proto;
        char namebuf[PATH_MAX + 1];
        char pathbuf[PATH_MAX + 1];

        /*
         * check for "."
         */
        if (idesc->id_entryno != 0)
                goto chk1;
        if (letoh32(dirp->e2d_ino) != 0 && dirp->e2d_namlen == 1 &&
                dirp->e2d_name[0] == '.') {
                if (letoh32(dirp->e2d_ino) != idesc->id_number) {
                        direrror(idesc->id_number, "BAD INODE NUMBER FOR '.'");
                        dirp->e2d_ino = htole32(idesc->id_number);
                        if (reply("FIX") == 1)
                                ret |= ALTERED;
                }
                if (sblock.e2fs.e2fs_rev > E2FS_REV0 &&
                    (sblock.e2fs.e2fs_features_incompat & EXT2F_INCOMPAT_FTYPE)
                    && (dirp->e2d_type != EXT2_FT_DIR)) {
                        direrror(idesc->id_number, "BAD TYPE VALUE FOR '.'");
                        dirp->e2d_type = EXT2_FT_DIR;
                        if (reply("FIX") == 1)
                                ret |= ALTERED;
                }
                goto chk1;
        }
        direrror(idesc->id_number, "MISSING '.'");
        proto.e2d_ino = htole32(idesc->id_number);
        proto.e2d_namlen = 1;
        if (sblock.e2fs.e2fs_rev > E2FS_REV0 &&
            (sblock.e2fs.e2fs_features_incompat & EXT2F_INCOMPAT_FTYPE))
                proto.e2d_type = EXT2_FT_DIR;
        else
                proto.e2d_type = 0;
        (void)strlcpy(proto.e2d_name, ".", sizeof proto.e2d_name);
        entrysize = EXT2FS_DIRSIZ(proto.e2d_namlen);
        if (letoh32(dirp->e2d_ino) != 0 && strcmp(dirp->e2d_name, "..") != 0) {
                pfatal("CANNOT FIX, FIRST ENTRY IN DIRECTORY CONTAINS %s\n",
                        dirp->e2d_name);
        } else if (letoh16(dirp->e2d_reclen) < entrysize) {
                pfatal("CANNOT FIX, INSUFFICIENT SPACE TO ADD '.'\n");
        } else if (letoh16(dirp->e2d_reclen) < 2 * entrysize) {
                proto.e2d_reclen = dirp->e2d_reclen;
                memcpy(dirp, &proto, (size_t)entrysize);
                if (reply("FIX") == 1)
                        ret |= ALTERED;
        } else {
                n = letoh16(dirp->e2d_reclen) - entrysize;
                proto.e2d_reclen = htole16(entrysize);
                memcpy(dirp, &proto, (size_t)entrysize);
                idesc->id_entryno++;
                lncntp[letoh32(dirp->e2d_ino)]--;
                dirp = (struct ext2fs_direct *)((char *)(dirp) + entrysize);
                memset(dirp, 0, (size_t)n);
                dirp->e2d_reclen = htole16(n);
                if (reply("FIX") == 1)
                        ret |= ALTERED;
        }
chk1:
        if (idesc->id_entryno > 1)
                goto chk2;
        inp = getinoinfo(idesc->id_number);
        proto.e2d_ino = htole32(inp->i_parent);
        proto.e2d_namlen = 2;
        if (sblock.e2fs.e2fs_rev > E2FS_REV0 &&
            (sblock.e2fs.e2fs_features_incompat & EXT2F_INCOMPAT_FTYPE))
                proto.e2d_type = EXT2_FT_DIR;
        else
                proto.e2d_type = 0;
        (void)strlcpy(proto.e2d_name, "..", sizeof proto.e2d_name);
        entrysize = EXT2FS_DIRSIZ(2);
        if (idesc->id_entryno == 0) {
                n = EXT2FS_DIRSIZ(dirp->e2d_namlen);
                if (letoh16(dirp->e2d_reclen) < n + entrysize)
                        goto chk2;
                proto.e2d_reclen = htole16(letoh16(dirp->e2d_reclen) - n);
                dirp->e2d_reclen = htole16(n);
                idesc->id_entryno++;
                lncntp[letoh32(dirp->e2d_ino)]--;
                dirp = (struct ext2fs_direct *)((char *)(dirp) + n);
                memset(dirp, 0, (size_t)letoh16(proto.e2d_reclen));
                dirp->e2d_reclen = proto.e2d_reclen;
        }
        if (letoh32(dirp->e2d_ino) != 0 &&
            dirp->e2d_namlen == 2 &&
            strncmp(dirp->e2d_name, "..", 2) == 0) {
                inp->i_dotdot = letoh32(dirp->e2d_ino);
                if (sblock.e2fs.e2fs_rev > E2FS_REV0 &&
                    (sblock.e2fs.e2fs_features_incompat & EXT2F_INCOMPAT_FTYPE)
                    && dirp->e2d_type != EXT2_FT_DIR) {
                        direrror(idesc->id_number, "BAD TYPE VALUE FOR '..'");
                        dirp->e2d_type = EXT2_FT_DIR;
                        if (reply("FIX") == 1)
                                ret |= ALTERED;
                }
                goto chk2;
        }
        if (letoh32(dirp->e2d_ino) != 0 &&
                dirp->e2d_namlen == 1 &&
                strncmp(dirp->e2d_name, ".", 1) != 0) {
                fileerror(inp->i_parent, idesc->id_number, "MISSING '..'");
                pfatal("CANNOT FIX, SECOND ENTRY IN DIRECTORY CONTAINS %s\n",
                        dirp->e2d_name);
                inp->i_dotdot = (ino_t)-1;
        } else if (letoh16(dirp->e2d_reclen) < entrysize) {
                fileerror(inp->i_parent, idesc->id_number, "MISSING '..'");
                pfatal("CANNOT FIX, INSUFFICIENT SPACE TO ADD '..'\n");
                inp->i_dotdot = (ino_t)-1;
        } else if (inp->i_parent != 0) {
                /*
                 * We know the parent, so fix now.
                 */
                inp->i_dotdot = inp->i_parent;
                fileerror(inp->i_parent, idesc->id_number, "MISSING '..'");
                proto.e2d_reclen = dirp->e2d_reclen;
                memcpy(dirp, &proto, (size_t)entrysize);
                if (reply("FIX") == 1)
                        ret |= ALTERED;
        }
        idesc->id_entryno++;
        if (letoh32(dirp->e2d_ino) != 0)
                lncntp[letoh32(dirp->e2d_ino)]--;
        return (ret|KEEPON);
chk2:
        if (letoh32(dirp->e2d_ino) == 0)
                return (ret|KEEPON);
        if (dirp->e2d_namlen <= 2 &&
            dirp->e2d_name[0] == '.' &&
            idesc->id_entryno >= 2) {
                if (dirp->e2d_namlen == 1) {
                        direrror(idesc->id_number, "EXTRA '.' ENTRY");
                        dirp->e2d_ino = 0;
                        if (reply("FIX") == 1)
                                ret |= ALTERED;
                        return (KEEPON | ret);
                }
                if (dirp->e2d_name[1] == '.') {
                        direrror(idesc->id_number, "EXTRA '..' ENTRY");
                        dirp->e2d_ino = 0;
                        if (reply("FIX") == 1)
                                ret |= ALTERED;
                        return (KEEPON | ret);
                }
        }
        idesc->id_entryno++;
        n = 0;
        if (letoh32(dirp->e2d_ino) > maxino ||
                (letoh32(dirp->e2d_ino) < EXT2_FIRSTINO &&
                 letoh32(dirp->e2d_ino) != EXT2_ROOTINO)) {
                fileerror(idesc->id_number, letoh32(dirp->e2d_ino), "I OUT OF RANGE");
                n = reply("REMOVE");
        } else {
again:
                switch (statemap[letoh32(dirp->e2d_ino)]) {
                case USTATE:
                        if (idesc->id_entryno <= 2)
                                break;
                        fileerror(idesc->id_number, letoh32(dirp->e2d_ino), "UNALLOCATED");
                        n = reply("REMOVE");
                        break;

                case DCLEAR:
                case FCLEAR:
                        if (idesc->id_entryno <= 2)
                                break;
                        if (statemap[letoh32(dirp->e2d_ino)] == FCLEAR)
                                errmsg = "DUP/BAD";
                        else if (!preen)
                                errmsg = "ZERO LENGTH DIRECTORY";
                        else {
                                n = 1;
                                break;
                        }
                        fileerror(idesc->id_number, letoh32(dirp->e2d_ino), errmsg);
                        if ((n = reply("REMOVE")) == 1)
                                break;
                        dp = ginode(letoh32(dirp->e2d_ino));
                        statemap[letoh32(dirp->e2d_ino)] =
                            (letoh16(dp->e2di_mode) & IFMT) == IFDIR ? DSTATE : FSTATE;
                        lncntp[letoh32(dirp->e2d_ino)] = letoh16(dp->e2di_nlink);
                        goto again;

                case DSTATE:
                case DFOUND:
                        inp = getinoinfo(letoh32(dirp->e2d_ino));
                        if (inp->i_parent != 0 && idesc->id_entryno > 2) {
                                getpathname(pathbuf, sizeof pathbuf,
                                    idesc->id_number, idesc->id_number);
                                getpathname(namebuf, sizeof namebuf,
                                    letoh32(dirp->e2d_ino), letoh32(dirp->e2d_ino));
                                pwarn("%s %s %s\n", pathbuf,
                                    "IS AN EXTRANEOUS HARD LINK TO DIRECTORY",
                                    namebuf);
                                if (preen)
                                        printf(" (IGNORED)\n");
                                else if ((n = reply("REMOVE")) == 1)
                                        break;
                        }
                        if (idesc->id_entryno > 2)
                                inp->i_parent = idesc->id_number;
                        /* fall through */

                case FSTATE:
                        if (sblock.e2fs.e2fs_rev > E2FS_REV0 &&
                            (sblock.e2fs.e2fs_features_incompat &
                                EXT2F_INCOMPAT_FTYPE) &&
                            dirp->e2d_type !=
                                inot2ext2dt(typemap[letoh32(dirp->e2d_ino)])) {
                                dirp->e2d_type =
                                    inot2ext2dt(typemap[letoh32(dirp->e2d_ino)]);
                                fileerror(idesc->id_number,
                                    letoh32(dirp->e2d_ino),
                                    "BAD TYPE VALUE");
                                if (reply("FIX") == 1)
                                        ret |= ALTERED;
                        }
                        lncntp[letoh32(dirp->e2d_ino)]--;
                        break;

                default:
                        errexit("BAD STATE %d FOR INODE I=%llu\n",
                            statemap[letoh32(dirp->e2d_ino)],
                            (unsigned long long)letoh32(dirp->e2d_ino));
                }
        }
        if (n == 0)
                return (ret|KEEPON);
        dirp->e2d_ino = 0;
        return (ret|KEEPON|ALTERED);
}

/*
 * Routine to sort disk blocks.
 */
static int
blksort(const void *inpp1, const void *inpp2)
{
        return ((* (struct inoinfo **) inpp1)->i_blks[0] -
                (* (struct inoinfo **) inpp2)->i_blks[0]);
}