/*      $OpenBSD: dir.c,v 1.35 2024/02/03 18:51:57 beck Exp $   */
/*      $NetBSD: dir.c,v 1.20 1996/09/27 22:45:11 christos Exp $        */

/*
 * 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>  /* DEV_BSIZE roundup btodb */
#include <sys/time.h>
#include <ufs/ufs/dinode.h>
#include <ufs/ufs/dir.h>
#include <ufs/ffs/fs.h>

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

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

char    *lfname = "lost+found";
int     lfmode = 01700;
struct  dirtemplate emptydir = { 0, DIRBLKSIZ };
struct  dirtemplate dirhead = {
        0, 12, DT_DIR, 1, ".",
        0, DIRBLKSIZ - 12, DT_DIR, 2, ".."
};

static int expanddir(union dinode *, char *);
static void freedir(ino_t, ino_t);
static struct direct *fsck_readdir(struct inodesc *);
static struct bufarea *getdirblk(daddr_t, long);
static int lftempname(char *, ino_t);
static int mkentry(struct inodesc *);
static int chgino(struct  inodesc *);

/*
 * Propagate connected state through the tree.
 */
void
propagate(ino_t inumber)
{
        struct  inoinfo *inp;
        char    state;

        inp = getinoinfo(inumber);
        state = GET_ISTATE(inp->i_number);
        for (;;) {
                SET_ISTATE(inp->i_number, state);
                if (inp->i_child &&
                    GET_ISTATE(inp->i_child->i_number) != state)
                        inp = inp->i_child;
                else if (inp->i_number == inumber)
                        break;
                else if (inp->i_sibling)
                        inp = inp->i_sibling;
                else
                        inp = getinoinfo(inp->i_parent);
        }
}

/*
 * Scan each entry in a directory block.
 */
int
dirscan(struct inodesc *idesc)
{
        struct direct *dp;
        struct bufarea *bp;
        int dsize, n;
        long blksiz;
        char dbuf[DIRBLKSIZ];

        if (idesc->id_type != DATA)
                errexit("wrong type to dirscan %d\n", idesc->id_type);
        if (idesc->id_entryno == 0 &&
            (idesc->id_filesize & (DIRBLKSIZ - 1)) != 0)
                idesc->id_filesize = roundup(idesc->id_filesize, DIRBLKSIZ);
        blksiz = idesc->id_numfrags * sblock.fs_fsize;
        if (chkrange(idesc->id_blkno, idesc->id_numfrags)) {
                idesc->id_filesize -= blksiz;
                return (SKIP);
        }
        idesc->id_loc = 0;
        for (dp = fsck_readdir(idesc); dp != NULL; dp = fsck_readdir(idesc)) {
                dsize = dp->d_reclen;
                memcpy(dbuf, dp, (size_t)dsize);
                idesc->id_dirp = (struct direct *)dbuf;
                if ((n = (*idesc->id_func)(idesc)) & ALTERED) {
                        bp = getdirblk(idesc->id_blkno, blksiz);
                        memcpy(bp->b_un.b_buf + idesc->id_loc - dsize, dbuf,
                            (size_t)dsize);
                        dirty(bp);
                        sbdirty();
                }
                if (n & STOP)
                        return (n);
        }
        return (idesc->id_filesize > 0 ? KEEPON : STOP);
}

/*
 * get next entry in a directory.
 */
static struct direct *
fsck_readdir(struct inodesc *idesc)
{
        struct direct *dp, *ndp;
        struct bufarea *bp;
        long size, blksiz, fix, dploc;

        blksiz = idesc->id_numfrags * sblock.fs_fsize;
        bp = getdirblk(idesc->id_blkno, blksiz);
        if (idesc->id_loc % DIRBLKSIZ == 0 && idesc->id_filesize > 0 &&
            idesc->id_loc < blksiz) {
                dp = (struct direct *)(bp->b_un.b_buf + idesc->id_loc);
                if (dircheck(idesc, dp))
                        goto dpok;
                if (idesc->id_fix == IGNORE)
                        return (0);
                fix = dofix(idesc, "DIRECTORY CORRUPTED");
                bp = getdirblk(idesc->id_blkno, blksiz);
                dp = (struct direct *)(bp->b_un.b_buf + idesc->id_loc);
                dp->d_reclen = DIRBLKSIZ;
                dp->d_ino = 0;
                dp->d_type = 0;
                dp->d_namlen = 0;
                dp->d_name[0] = '\0';
                if (fix)
                        dirty(bp);
                idesc->id_loc += DIRBLKSIZ;
                idesc->id_filesize -= DIRBLKSIZ;
                return (dp);
        }
dpok:
        if (idesc->id_filesize <= 0 || idesc->id_loc >= blksiz)
                return NULL;
        dploc = idesc->id_loc;
        dp = (struct direct *)(bp->b_un.b_buf + dploc);
        idesc->id_loc += dp->d_reclen;
        idesc->id_filesize -= dp->d_reclen;
        if ((idesc->id_loc % DIRBLKSIZ) == 0)
                return (dp);
        ndp = (struct direct *)(bp->b_un.b_buf + idesc->id_loc);
        if (idesc->id_loc < blksiz && idesc->id_filesize > 0 &&
            dircheck(idesc, ndp) == 0) {
                size = DIRBLKSIZ - (idesc->id_loc % DIRBLKSIZ);
                idesc->id_loc += size;
                idesc->id_filesize -= size;
                if (idesc->id_fix == IGNORE)
                        return (0);
                fix = dofix(idesc, "DIRECTORY CORRUPTED");
                bp = getdirblk(idesc->id_blkno, blksiz);
                dp = (struct direct *)(bp->b_un.b_buf + dploc);
                dp->d_reclen += size;
                if (fix)
                        dirty(bp);
        }
        return (dp);
}

/*
 * Verify that a directory entry is valid.
 * This is a superset of the checks made in the kernel.
 */
int
dircheck(struct inodesc *idesc, struct direct *dp)
{
        int size;
        char *cp;
        u_char namlen, type;
        int spaceleft;

        spaceleft = DIRBLKSIZ - (idesc->id_loc % DIRBLKSIZ);
        if (dp->d_ino >= maxino ||
            dp->d_reclen == 0 ||
            dp->d_reclen > spaceleft ||
            (dp->d_reclen & 0x3) != 0)
                return (0);
        if (dp->d_ino == 0)
                return (1);
        size = DIRSIZ(dp);
        namlen = dp->d_namlen;
        type = dp->d_type;
        if (dp->d_reclen < size ||
            idesc->id_filesize < size ||
            type > 15)
                return (0);
        for (cp = dp->d_name, size = 0; size < namlen; size++)
                if (*cp == '\0' || (*cp++ == '/'))
                        return (0);
        if (*cp != '\0')
                return (0);
        return (1);
}

void
direrror(ino_t ino, char *errmesg)
{
        fileerror(ino, ino, errmesg);
}

void
fileerror(ino_t cwd, ino_t ino, char *errmesg)
{
        union dinode *dp;
        char pathbuf[PATH_MAX + 1];

        pwarn("%s ", errmesg);
        pinode(ino);
        printf("\n");
        getpathname(pathbuf, sizeof pathbuf, cwd, ino);
        if (ino < ROOTINO || ino > maxino) {
                pfatal("NAME=%s\n", pathbuf);
                return;
        }
        dp = ginode(ino);
        if (ftypeok(dp))
                pfatal("%s=%s\n",
                    (DIP(dp, di_mode) & IFMT) == IFDIR ? "DIR" : "FILE",
                    pathbuf);
        else
                pfatal("NAME=%s\n", pathbuf);
}

void
adjust(struct inodesc *idesc, short lcnt)
{
        union dinode *dp;

        dp = ginode(idesc->id_number);
        if (DIP(dp, di_nlink) == lcnt) {
                if (linkup(idesc->id_number, 0) == 0)
                        clri(idesc, "UNREF", 0);
        } else {
                pwarn("LINK COUNT %s", (lfdir == idesc->id_number) ? lfname :
                        ((DIP(dp, di_mode) & IFMT) == IFDIR ? "DIR" : "FILE"));
                pinode(idesc->id_number);
                printf(" COUNT %d SHOULD BE %d", DIP(dp, di_nlink),
                    DIP(dp, di_nlink) - lcnt);
                if (preen) {
                        if (lcnt < 0) {
                                printf("\n");
                                pfatal("LINK COUNT INCREASING");
                        }
                        if (preen)
                                printf(" (ADJUSTED)\n");
                }
                if (preen || reply("ADJUST") == 1) {
                        DIP_SET(dp, di_nlink, DIP(dp, di_nlink) - lcnt);
                        inodirty();
                }
        }
}

static int
mkentry(struct inodesc *idesc)
{
        struct direct *dirp = idesc->id_dirp;
        struct direct newent;
        int newlen, oldlen;

        newent.d_namlen = strlen(idesc->id_name);
        newlen = DIRSIZ(&newent);
        if (dirp->d_ino != 0)
                oldlen = DIRSIZ(dirp);
        else
                oldlen = 0;
        if (dirp->d_reclen - oldlen < newlen)
                return (KEEPON);
        newent.d_reclen = dirp->d_reclen - oldlen;
        dirp->d_reclen = oldlen;
        dirp = (struct direct *)(((char *)dirp) + oldlen);
        dirp->d_ino = idesc->id_parent; /* ino to be entered is in id_parent */
        dirp->d_reclen = newent.d_reclen;
        dirp->d_type = GET_ITYPE(idesc->id_parent);
        dirp->d_namlen = newent.d_namlen;
        memcpy(dirp->d_name, idesc->id_name, (size_t)dirp->d_namlen + 1);
        return (ALTERED|STOP);
}

static int
chgino(struct inodesc *idesc)
{
        struct direct *dirp = idesc->id_dirp;

        if (memcmp(dirp->d_name, idesc->id_name, (int)dirp->d_namlen + 1))
                return (KEEPON);
        dirp->d_ino = idesc->id_parent;
        dirp->d_type = GET_ITYPE(idesc->id_parent);
        return (ALTERED|STOP);
}

int
linkup(ino_t orphan, ino_t parentdir)
{
        union dinode *dp;
        int lostdir;
        ino_t oldlfdir;
        struct inodesc idesc;
        char tempname[BUFSIZ];

        memset(&idesc, 0, sizeof(struct inodesc));
        dp = ginode(orphan);
        lostdir = (DIP(dp, di_mode) & IFMT) == IFDIR;
        pwarn("UNREF %s ", lostdir ? "DIR" : "FILE");
        pinode(orphan);
        if (preen && DIP(dp, di_size) == 0)
                return (0);
        if (preen)
                printf(" (RECONNECTED)\n");
        else
                if (reply("RECONNECT") == 0)
                        return (0);
        if (lfdir == 0) {
                dp = ginode(ROOTINO);
                idesc.id_name = lfname;
                idesc.id_type = DATA;
                idesc.id_func = findino;
                idesc.id_number = ROOTINO;
                if ((ckinode(dp, &idesc) & FOUND) != 0) {
                        lfdir = idesc.id_parent;
                } else {
                        pwarn("NO lost+found DIRECTORY");
                        if (preen || reply("CREATE")) {
                                lfdir = allocdir(ROOTINO, 0, lfmode);
                                if (lfdir != 0) {
                                        if (makeentry(ROOTINO, lfdir, lfname) != 0) {
                                                if (preen)
                                                        printf(" (CREATED)\n");
                                        } else {
                                                freedir(lfdir, ROOTINO);
                                                lfdir = 0;
                                                if (preen)
                                                        printf("\n");
                                        }
                                }
                        }
                }
                if (lfdir == 0) {
                        pfatal("SORRY. CANNOT CREATE lost+found DIRECTORY");
                        printf("\n\n");
                        return (0);
                }
        }
        dp = ginode(lfdir);
        if ((DIP(dp, di_mode) & IFMT) != IFDIR) {
                pfatal("lost+found IS NOT A DIRECTORY");
                if (reply("REALLOCATE") == 0)
                        return (0);
                oldlfdir = lfdir;
                if ((lfdir = allocdir(ROOTINO, 0, lfmode)) == 0) {
                        pfatal("SORRY. CANNOT CREATE lost+found DIRECTORY\n\n");
                        return (0);
                }
                if ((changeino(ROOTINO, lfname, lfdir) & ALTERED) == 0) {
                        pfatal("SORRY. CANNOT CREATE lost+found DIRECTORY\n\n");
                        return (0);
                }
                inodirty();
                idesc.id_type = ADDR;
                idesc.id_func = pass4check;
                idesc.id_number = oldlfdir;
                adjust(&idesc, ILNCOUNT(oldlfdir) + 1);
                ILNCOUNT(oldlfdir) = 0;
                dp = ginode(lfdir);
        }
        if (GET_ISTATE(lfdir) != DFOUND) {
                pfatal("SORRY. NO lost+found DIRECTORY\n\n");
                return (0);
        }
        (void)lftempname(tempname, orphan);
        if (makeentry(lfdir, orphan, tempname) == 0) {
                pfatal("SORRY. NO SPACE IN lost+found DIRECTORY");
                printf("\n\n");
                return (0);
        }
        ILNCOUNT(orphan)--;
        if (lostdir) {
                if ((changeino(orphan, "..", lfdir) & ALTERED) == 0 &&
                    parentdir != (ino_t)-1)
                        (void)makeentry(orphan, lfdir, "..");
                dp = ginode(lfdir);
                DIP_SET(dp, di_nlink, DIP(dp, di_nlink) + 1);
                inodirty();
                ILNCOUNT(lfdir)++;
                pwarn("DIR I=%llu CONNECTED. ",
                    (unsigned long long)orphan);
                if (parentdir != (ino_t)-1) {
                        printf("PARENT WAS I=%llu\n",
                            (unsigned long long)parentdir);
                        /*
                         * The parent directory, because of the ordering
                         * guarantees, has had the link count incremented
                         * for the child, but no entry was made.  This
                         * fixes the parent link count so that fsck does
                         * not need to be rerun.
                         */
                        ILNCOUNT(parentdir)++;
                }
                if (preen == 0)
                        printf("\n");
        }
        return (1);
}

/*
 * fix an entry in a directory.
 */
int
changeino(ino_t dir, char *name, ino_t newnum)
{
        struct inodesc idesc;

        memset(&idesc, 0, sizeof(struct inodesc));
        idesc.id_type = DATA;
        idesc.id_func = chgino;
        idesc.id_number = dir;
        idesc.id_fix = DONTKNOW;
        idesc.id_name = name;
        idesc.id_parent = newnum;       /* new value for name */
        return (ckinode(ginode(dir), &idesc));
}

/*
 * make an entry in a directory
 */
int
makeentry(ino_t parent, ino_t ino, char *name)
{
        union dinode *dp;
        struct inodesc idesc;
        char pathbuf[PATH_MAX + 1];

        if (parent < ROOTINO || parent >= maxino ||
            ino < ROOTINO || ino >= maxino)
                return (0);
        memset(&idesc, 0, sizeof(struct inodesc));
        idesc.id_type = DATA;
        idesc.id_func = mkentry;
        idesc.id_number = parent;
        idesc.id_parent = ino;  /* this is the inode to enter */
        idesc.id_fix = DONTKNOW;
        idesc.id_name = name;
        dp = ginode(parent);
        if (DIP(dp, di_size) % DIRBLKSIZ) {
                DIP_SET(dp, di_size, roundup(DIP(dp, di_size), DIRBLKSIZ));
                inodirty();
        }
        if ((ckinode(dp, &idesc) & ALTERED) != 0)
                return (1);
        getpathname(pathbuf, sizeof pathbuf, parent, parent);
        dp = ginode(parent);
        if (expanddir(dp, pathbuf) == 0)
                return (0);
        return (ckinode(dp, &idesc) & ALTERED);
}

/*
 * Attempt to expand the size of a directory
 */
static int
expanddir(union dinode *dp, char *name)
{
        daddr_t lastbn, newblk;
        struct bufarea *bp;
        char *cp, firstblk[DIRBLKSIZ];
        u_int64_t dis;

        dis = lblkno(&sblock, DIP(dp, di_size));
        if (dis > (u_int64_t)INT_MAX)
                return (0);
        lastbn = dis;
        if (lastbn >= NDADDR - 1 || DIP(dp, di_db[lastbn]) == 0 ||
            DIP(dp, di_size) == 0)
                return (0);
        if ((newblk = allocblk(sblock.fs_frag)) == 0)
                return (0);
        DIP_SET(dp, di_db[lastbn + 1], DIP(dp, di_db[lastbn]));
        DIP_SET(dp, di_db[lastbn], newblk);
        DIP_SET(dp, di_size, DIP(dp, di_size) + sblock.fs_bsize);
        DIP_SET(dp, di_blocks, DIP(dp, di_blocks) + btodb(sblock.fs_bsize));
        bp = getdirblk(DIP(dp, di_db[lastbn + 1]),
            sblksize(&sblock, DIP(dp, di_size), lastbn + 1));
        if (bp->b_errs)
                goto bad;
        memcpy(firstblk, bp->b_un.b_buf, DIRBLKSIZ);
        bp = getdirblk(newblk, sblock.fs_bsize);
        if (bp->b_errs)
                goto bad;
        memcpy(bp->b_un.b_buf, firstblk, DIRBLKSIZ);
        for (cp = &bp->b_un.b_buf[DIRBLKSIZ];
             cp < &bp->b_un.b_buf[sblock.fs_bsize];
             cp += DIRBLKSIZ)
                memcpy(cp, &emptydir, sizeof emptydir);
        dirty(bp);
        bp = getdirblk(DIP(dp, di_db[lastbn + 1]),
            sblksize(&sblock, DIP(dp, di_size), lastbn + 1));
        if (bp->b_errs)
                goto bad;
        memcpy(bp->b_un.b_buf, &emptydir, sizeof emptydir);
        pwarn("NO SPACE LEFT IN %s", name);
        if (preen)
                printf(" (EXPANDED)\n");
        else if (reply("EXPAND") == 0)
                goto bad;
        dirty(bp);
        inodirty();
        return (1);
bad:
        DIP_SET(dp, di_db[lastbn], DIP(dp, di_db[lastbn + 1]));
        DIP_SET(dp, di_db[lastbn + 1], 0);
        DIP_SET(dp, di_size, DIP(dp, di_size) - sblock.fs_bsize);
        DIP_SET(dp, di_blocks, DIP(dp, di_blocks) - btodb(sblock.fs_bsize));
        freeblk(newblk, sblock.fs_frag);
        return (0);
}

/*
 * allocate a new directory
 */
ino_t
allocdir(ino_t parent, ino_t request, int mode)
{
        ino_t ino;
        uid_t uid;
        gid_t gid;
        char *cp;
        union dinode *dp;
        struct bufarea *bp;
        struct dirtemplate *dirp;
        struct inoinfo *inp;

        ino = allocino(request, IFDIR|mode);
        dirp = &dirhead;
        dirp->dot_ino = ino;
        dirp->dotdot_ino = parent;
        dp = ginode(ino);
        bp = getdirblk(DIP(dp, di_db[0]), sblock.fs_fsize);
        if (bp->b_errs) {
                freeino(ino);
                return (0);
        }
        memcpy(bp->b_un.b_buf, dirp, sizeof(struct dirtemplate));
        for (cp = &bp->b_un.b_buf[DIRBLKSIZ];
             cp < &bp->b_un.b_buf[sblock.fs_fsize];
             cp += DIRBLKSIZ)
                memcpy(cp, &emptydir, sizeof emptydir);
        dirty(bp);
        DIP_SET(dp, di_nlink, 2);
        inodirty();
        if (ino == ROOTINO) {
                ILNCOUNT(ino) = DIP(dp, di_nlink);
                cacheino(dp, ino);
                return(ino);
        }
        if (GET_ISTATE(parent) != DSTATE && GET_ISTATE(parent) != DFOUND) {
                freeino(ino);
                return (0);
        }
        cacheino(dp, ino);
        inp = getinoinfo(ino);
        inp->i_parent = parent;
        inp->i_dotdot = parent;
        SET_ISTATE(ino, GET_ISTATE(parent));
        if (GET_ISTATE(ino) == DSTATE) {
                ILNCOUNT(ino) = DIP(dp, di_nlink);
                ILNCOUNT(parent)++;
        }
        dp = ginode(parent);
        DIP_SET(dp, di_nlink, DIP(dp, di_nlink) + 1);
        uid = DIP(dp, di_uid);
        gid = DIP(dp, di_gid);
        inodirty();
        dp = ginode(ino);
        DIP_SET(dp, di_uid, uid);
        DIP_SET(dp, di_gid, gid);
        inodirty();
        return (ino);
}

/*
 * free a directory inode
 */
static void
freedir(ino_t ino, ino_t parent)
{
        union dinode *dp;

        if (ino != parent) {
                dp = ginode(parent);
                DIP_SET(dp, di_nlink, DIP(dp, di_nlink) - 1);
                inodirty();
        }
        freeino(ino);
}

/*
 * generate a temporary name for the lost+found directory.
 */
static int
lftempname(char *bufp, ino_t ino)
{
        ino_t in;
        char *cp;
        int namlen;

        cp = bufp + 2;
        for (in = maxino; in > 0; in /= 10)
                cp++;
        *--cp = 0;
        namlen = cp - bufp;
        in = ino;
        while (cp > bufp) {
                *--cp = (in % 10) + '0';
                in /= 10;
        }
        *cp = '#';
        return (namlen);
}

/*
 * Get a directory block.
 * Insure that it is held until another is requested.
 */
static struct bufarea *
getdirblk(daddr_t blkno, long size)
{

        if (pdirbp != 0)
                pdirbp->b_flags &= ~B_INUSE;
        pdirbp = getdatablk(blkno, size);
        return (pdirbp);
}