[dump.git] / restore / dirs.c

/*
 *      Ported to Linux's Second Extended File System as part of the
 *      dump and restore backup suit
 *      Remy Card <card@Linux.EU.Org>, 1994-1997
 *      Stelian Pop <stelian@popies.net>, 1999-2000
 *      Stelian Pop <stelian@popies.net> - Alcôve <www.alcove.com>, 2000-2002
 */

/*
 * Copyright (c) 1983, 1993
 *      The Regents of the University of California.  All rights reserved.
 * (c) UNIX System Laboratories, Inc.
 * All or some portions of this file are derived from material licensed
 * to the University of California by American Telephone and Telegraph
 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
 * the permission of UNIX System Laboratories, Inc.
 *
 * 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.
 */

#ifndef lint
static const char rcsid[] =
        "$Id: dirs.c,v 1.31 2005/01/24 10:32:14 stelian Exp $";
#endif /* not lint */

#include <config.h>
#include <compatlfs.h>
#include <sys/types.h>
#include <sys/param.h>
#include <sys/file.h>
#include <sys/stat.h>

#ifdef  __linux__
#ifdef HAVE_EXT2FS_EXT2_FS_H
#include <ext2fs/ext2_fs.h>
#else
#include <linux/ext2_fs.h>
#endif
#include <bsdcompat.h>
#else   /* __linux__ */
#ifdef sunos
#include <sys/fcntl.h>
#include <bsdcompat.h>
#else
#include <ufs/ufs/dinode.h>
#include <ufs/ufs/dir.h>
#endif
#endif  /* __linux__ */
#include <protocols/dumprestore.h>

#include <compaterr.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#ifdef  __linux__
#include <endian.h>
#else
#ifdef sunos
#include <arpa/nameser_compat.h>
#else
#include <machine/endian.h>
#endif
#endif

#include "pathnames.h"
#include "restore.h"
#include "extern.h"

/*
 * Symbol table of directories read from tape.
 */
#define HASHSIZE        1000
#define INOHASH(val) (val % HASHSIZE)
struct inotab {
        struct  inotab *t_next;
        dump_ino_t t_ino;
        OFF_T   t_seekpt;
        OFF_T   t_size;
};
static struct inotab *inotab[HASHSIZE];

/*
 * Information retained about directories.
 */
struct modeinfo {
        dump_ino_t ino;
        struct timeval timep[2];
        mode_t mode;
        uid_t uid;
        gid_t gid;
        unsigned int flags;
};

/*
 * Definitions for library routines operating on directories.
 */
#undef DIRBLKSIZ
#define DIRBLKSIZ 1024
struct rstdirdesc {
        int     dd_fd;
        int32_t dd_loc;
        int32_t dd_size;
        char    dd_buf[DIRBLKSIZ];
};

/*
 * Global variables for this file.
 */
static OFF_T    seekpt;
static FILE     *df, *mf;
static RST_DIR  *dirp;
static char     dirfile[MAXPATHLEN] = "#";      /* No file */
static char     modefile[MAXPATHLEN] = "#";     /* No file */
static char     dot[2] = ".";                   /* So it can be modified */

/*
 * Format of old style directories.
 */
#define ODIRSIZ 14
struct odirect {
        u_short d_ino;
        char    d_name[ODIRSIZ];
};

#if defined(__linux__) || defined(sunos)
static struct inotab    *allocinotab __P((dump_ino_t, OFF_T));
static void              savemodeinfo __P((dump_ino_t, struct new_bsd_inode *));
#else
static struct inotab    *allocinotab __P((dump_ino_t, OFF_T));
static void              savemodeinfo __P((dump_ino_t, struct dinode *));
#endif
static void              dcvt __P((struct odirect *, struct direct *));
static void              flushent __P((void));
static struct inotab    *inotablookup __P((dump_ino_t));
static RST_DIR          *opendirfile __P((const char *));
static void              putdir __P((char *, size_t));
static void              putent __P((struct direct *));
static void             rst_seekdir __P((RST_DIR *, OFF_T, OFF_T));
static OFF_T            rst_telldir __P((RST_DIR *));
static struct direct    *searchdir __P((dump_ino_t, char *));

#ifdef sunos
extern int fdsmtc;
#endif

/*
 *      Extract directory contents, building up a directory structure
 *      on disk for extraction by name.
 *      If genmode is requested, save mode, owner, and times for all
 *      directories on the tape.
 */
void
extractdirs(int genmode)
{
        int i;
#if defined(__linux__) || defined(sunos)
        struct new_bsd_inode ip;
#else
        struct dinode ip;
#endif
        struct inotab *itp;
        struct direct nulldir;
        int fd;
        dump_ino_t ino;

        Vprintf(stdout, "Extract directories from tape\n");
        (void) snprintf(dirfile, sizeof(dirfile), "%s/rstdir%ld", tmpdir,
                (long)dumpdate);
        if (command != 'r' && command != 'R') {
                (void) strncat(dirfile, "-XXXXXX",
                        sizeof(dirfile) - strlen(dirfile));
                fd = MKSTEMP(dirfile);
        } else
                fd = OPEN(dirfile, O_RDWR|O_CREAT|O_EXCL, 0666);
        if (fd == -1 || (df = fdopen(fd, "w")) == NULL) {
                if (fd != -1)
                        close(fd);
                err(1, "cannot create directory temporary %s", dirfile);
        }
        if (genmode != 0) {
                (void) snprintf(modefile, sizeof(modefile), "%s/rstmode%ld", tmpdir, (long)dumpdate);
                if (command != 'r' && command != 'R') {
                        (void) strncat(modefile, "-XXXXXX",
                                sizeof(modefile) - strlen(modefile));
                        fd = MKSTEMP(modefile);
                } else
                        fd = OPEN(modefile, O_RDWR|O_CREAT|O_EXCL, 0666);
                if (fd == -1 || (mf = fdopen(fd, "w")) == NULL) {
                        if (fd != -1)
                                close(fd);
                        err(1, "cannot create modefile %s", modefile);
                }
        }
        nulldir.d_ino = 0;
        nulldir.d_type = DT_DIR;
        nulldir.d_namlen = 1;
        nulldir.d_name[0] = '/';
        nulldir.d_name[1] = '\0';
        nulldir.d_reclen = DIRSIZ(0, &nulldir);
        for (;;) {
                curfile.name = "<directory file - name unknown>";
                curfile.action = USING;
                ino = curfile.ino;
                if (curfile.dip == NULL || (curfile.dip->di_mode & IFMT) != IFDIR) {
                        if ( fclose(df) == EOF )
                                err(1, "cannot write to file %s", dirfile);
                        dirp = opendirfile(dirfile);
                        if (dirp == NULL)
                                warn("opendirfile");
                        if (mf != NULL && fclose(mf) == EOF )
                                err(1, "cannot write to file %s", dirfile);
                        i = dirlookup(dot);
                        if (i == 0)
                                panic("Root directory is not on tape\n");
                        return;
                }
                memcpy(&ip, curfile.dip, sizeof(ip));
                itp = allocinotab(ino, seekpt);
                getfile(putdir, xtrnull);
                while (spcl.c_flags & DR_EXTATTRIBUTES) {
                        switch (spcl.c_extattributes) {
                        case EXT_MACOSFNDRINFO:
                                msg("MacOSX attributes not supported, skipping\n");
                                skipfile();
                                break;
                        case EXT_MACOSRESFORK:
                                msg("MacOSX attributes not supported, skipping\n");
                                skipfile();
                                break;
                        case EXT_XATTR:
                                msg("EA/ACLs attributes not supported, skipping\n");
                                skipfile();
                                break;
                        }
                }
                savemodeinfo(ino, &ip);
                putent(&nulldir);
                flushent();
                itp->t_size = seekpt - itp->t_seekpt;
        }
}

/*
 * skip over all the directories on the tape
 */
void
skipdirs(void)
{

        while (curfile.dip && (curfile.dip->di_mode & IFMT) == IFDIR) {
                skipfile();
        }
}

/*
 *      Recursively find names and inumbers of all files in subtree
 *      pname and pass them off to be processed.
 */
void
treescan(char *pname, dump_ino_t ino, long (*todo) __P((char *, dump_ino_t, int)))
{
        struct inotab *itp;
        struct direct *dp;
        int namelen;
        OFF_T bpt;
        char locname[MAXPATHLEN + 1];

        itp = inotablookup(ino);
        if (itp == NULL) {
                /*
                 * Pname is name of a simple file or an unchanged directory.
                 */
                (void) (*todo)(pname, ino, LEAF);
                return;
        }
        /*
         * Pname is a dumped directory name.
         */
        if ((*todo)(pname, ino, NODE) == FAIL)
                return;
        /*
         * begin search through the directory
         * skipping over "." and ".."
         */
        namelen = snprintf(locname, sizeof(locname), "%s/", pname);
        if (namelen >= (int)sizeof(locname))
                namelen = sizeof(locname) - 1;
        rst_seekdir(dirp, itp->t_seekpt, itp->t_seekpt);
        dp = rst_readdir(dirp); /* "." */
        if (dp != NULL && strcmp(dp->d_name, ".") == 0)
                dp = rst_readdir(dirp); /* ".." */
        else
                fprintf(stderr, "Warning: `.' missing from directory %s\n",
                        pname);
        if (dp != NULL && strcmp(dp->d_name, "..") == 0)
                dp = rst_readdir(dirp); /* first real entry */
        else
                fprintf(stderr, "Warning: `..' missing from directory %s\n",
                        pname);
        bpt = rst_telldir(dirp);
        /*
         * a zero inode signals end of directory
         */
        while (dp != NULL) {
                locname[namelen] = '\0';
                if (namelen + dp->d_namlen >= (int)sizeof(locname)) {
                        fprintf(stderr, "%s%s: name exceeds %ld char\n",
                                locname, dp->d_name, (long)sizeof(locname) - 1);
                } else {
                        (void) strncat(locname, dp->d_name, (int)dp->d_namlen);
                        treescan(locname, dp->d_ino, todo);
                        rst_seekdir(dirp, bpt, itp->t_seekpt);
                }
                dp = rst_readdir(dirp);
                bpt = rst_telldir(dirp);
        }
}

/*
 * Lookup a pathname which is always assumed to start from the ROOTINO.
 */
struct direct *
pathsearch(const char *pathname)
{
        dump_ino_t ino;
        struct direct *dp;
        char *path, *name, buffer[MAXPATHLEN];

        strcpy(buffer, pathname);
        path = buffer;
        ino = ROOTINO;
        while (*path == '/')
                path++;
        dp = NULL;
#ifdef __linux__
        while ((name = strsep(&path, "/")) != NULL && *name /* != NULL */) {
#else
        while ((name = strtok_r(NULL, "/", &path)) != NULL && *name /* != NULL */) {
#endif
                if ((dp = searchdir(ino, name)) == NULL)
                        return (NULL);
                ino = dp->d_ino;
        }
        return (dp);
}

/*
 * Lookup the requested name in directory inum.
 * Return its inode number if found, zero if it does not exist.
 */
static struct direct *
searchdir(dump_ino_t inum, char *name)
{
        struct direct *dp;
        struct inotab *itp;
        int len;

        itp = inotablookup(inum);
        if (itp == NULL)
                return (NULL);
        rst_seekdir(dirp, itp->t_seekpt, itp->t_seekpt);
        len = strlen(name);
        do {
                dp = rst_readdir(dirp);
                if (dp == NULL)
                        return (NULL);
        } while (dp->d_namlen != len || strncmp(dp->d_name, name, len) != 0);
        return (dp);
}

/*
 * Put the directory entries in the directory file
 */
static void
putdir(char *buf, size_t size)
{
        struct direct cvtbuf;
        struct odirect *odp;
        struct odirect *eodp;
        struct direct *dp;
        long loc, i;

        if (cvtflag && !ufs2flag) {
                eodp = (struct odirect *)&buf[size];
                for (odp = (struct odirect *)buf; odp < eodp; odp++)
                        if (odp->d_ino != 0) {
                                dcvt(odp, &cvtbuf);
                                putent(&cvtbuf);
                        }
        } else {
                for (loc = 0; loc < (long)size; ) {
                        dp = (struct direct *)(buf + loc);
#ifdef  DIRDEBUG
                        printf ("reclen = %d, namlen = %d, type = %d\n",
                                dp->d_reclen, dp->d_namlen, dp->d_type);
#endif
                        if (Bcvt)
                                swabst((u_char *)"is", (u_char *) dp);
                        if (oldinofmt && dp->d_ino != 0) {
#                               if BYTE_ORDER == BIG_ENDIAN
                                        if (Bcvt)
                                                dp->d_namlen = dp->d_type;
#                               else
                                        if (!Bcvt)
                                                dp->d_namlen = dp->d_type;
#                               endif
                                if (dp->d_namlen == 0 && dp->d_type != 0)
                                        dp->d_namlen = dp->d_type;
                                dp->d_type = DT_UNKNOWN;
                        }
#ifdef  DIRDEBUG
                        printf ("reclen = %d, namlen = %d, type = %d\n",
                                dp->d_reclen, dp->d_namlen, dp->d_type);
#endif
                        i = DIRBLKSIZ - (loc & (DIRBLKSIZ - 1));
                        if ((dp->d_reclen & 0x3) != 0 ||
                            dp->d_reclen > i ||
                            dp->d_reclen < DIRSIZ(0, dp)
#if MAXNAMLEN < 255
                            || dp->d_namlen > MAXNAMLEN
#endif
                            ) {
                                Vprintf(stdout, "Mangled directory: ");
                                if ((dp->d_reclen & 0x3) != 0)
                                        Vprintf(stdout,
                                           "reclen not multiple of 4 ");
                                if (dp->d_reclen < DIRSIZ(0, dp))
                                        Vprintf(stdout,
                                           "reclen less than DIRSIZ (%d < %d) ",
                                           dp->d_reclen, DIRSIZ(0, dp));
#if MAXNAMLEN < 255
                                if (dp->d_namlen > MAXNAMLEN)
                                        Vprintf(stdout,
                                           "reclen name too big (%d > %d) ",
                                           dp->d_namlen, MAXNAMLEN);
#endif
                                Vprintf(stdout, "\n");
                                loc += i;
                                continue;
                        }
                        loc += dp->d_reclen;
                        if (dp->d_ino != 0) {
                                putent(dp);
                        }
                }
        }
}

/*
 * These variables are "local" to the following two functions.
 */
static char dirbuf[DIRBLKSIZ];
static long dirloc = 0;
static long prev = 0;

/*
 * add a new directory entry to a file.
 */
static void
putent(struct direct *dp)
{
        dp->d_reclen = DIRSIZ(0, dp);
        if (dirloc + dp->d_reclen > DIRBLKSIZ) {
                ((struct direct *)(dirbuf + prev))->d_reclen =
                    DIRBLKSIZ - prev;
                if ( fwrite(dirbuf, 1, DIRBLKSIZ, df) != DIRBLKSIZ )
                        err(1,"cannot write to file %s", dirfile);
                dirloc = 0;
        }
        memmove(dirbuf + dirloc, dp, (size_t)dp->d_reclen);
        prev = dirloc;
        dirloc += dp->d_reclen;
}

/*
 * flush out a directory that is finished.
 */
static void
flushent(void)
{
        ((struct direct *)(dirbuf + prev))->d_reclen = DIRBLKSIZ - prev;
        if ( fwrite(dirbuf, (int)dirloc, 1, df) != 1 )
                err(1, "cannot write to file %s", dirfile);
        seekpt = FTELL(df);
        if (seekpt == -1)
                err(1, "cannot write to file %s", dirfile);
        dirloc = 0;
}

static void
dcvt(struct odirect *odp, struct direct *ndp)
{

        memset(ndp, 0, (size_t)(sizeof *ndp));
        ndp->d_ino =  odp->d_ino;
        ndp->d_type = DT_UNKNOWN;
        (void) strncpy(ndp->d_name, odp->d_name, ODIRSIZ);
        ndp->d_namlen = strlen(ndp->d_name);
        ndp->d_reclen = DIRSIZ(0, ndp);
}

/*
 * Seek to an entry in a directory.
 * Only values returned by rst_telldir should be passed to rst_seekdir.
 * This routine handles many directories in a single file.
 * It takes the base of the directory in the file, plus
 * the desired seek offset into it.
 */
static void
rst_seekdir(RST_DIR *dirp, OFF_T loc, OFF_T base)
{

        if (loc == rst_telldir(dirp))
                return;
        loc -= base;
        if (loc < 0)
                fprintf(stderr, "bad seek pointer to rst_seekdir %lld\n", (long long int)loc);
        (void) LSEEK(dirp->dd_fd, base + (loc & ~(DIRBLKSIZ - 1)), SEEK_SET);
        dirp->dd_loc = loc & (DIRBLKSIZ - 1);
        if (dirp->dd_loc != 0)
                dirp->dd_size = read(dirp->dd_fd, dirp->dd_buf, DIRBLKSIZ);
}

/*
 * get next entry in a directory.
 */
struct direct *
rst_readdir(RST_DIR *dirp)
{
        struct direct *dp;

        for (;;) {
                if (dirp->dd_loc == 0) {
                        dirp->dd_size = read(dirp->dd_fd, dirp->dd_buf,
                            DIRBLKSIZ);
                        if (dirp->dd_size <= 0) {
                                Dprintf(stderr, "error reading directory\n");
                                return (NULL);
                        }
                }
                if (dirp->dd_loc >= dirp->dd_size) {
                        dirp->dd_loc = 0;
                        continue;
                }
                dp = (struct direct *)(dirp->dd_buf + dirp->dd_loc);
                if (dp->d_reclen == 0 ||
                    dp->d_reclen > DIRBLKSIZ + 1 - dirp->dd_loc) {
                        Dprintf(stderr, "corrupted directory: bad reclen %d\n",
                                dp->d_reclen);
                        return (NULL);
                }
                dirp->dd_loc += dp->d_reclen;
                if (dp->d_ino == 0 && strcmp(dp->d_name, "/") == 0)
                        return (NULL);
                if (dp->d_ino >= maxino) {
                        Dprintf(stderr, "corrupted directory: bad inum %d\n",
                                dp->d_ino);
                        continue;
                }
                return (dp);
        }
}

/*
 * Simulate the opening of a directory
 */
RST_DIR *
rst_opendir(const char *name)
{
        struct inotab *itp;
        RST_DIR *dirp;
        dump_ino_t ino;

        if ((ino = dirlookup(name)) > 0 &&
            (itp = inotablookup(ino)) != NULL) {
                dirp = opendirfile(dirfile);
                rst_seekdir(dirp, itp->t_seekpt, itp->t_seekpt);
                return (dirp);
        }
        return (NULL);
}

/*
 * In our case, there is nothing to do when closing a directory.
 */
void
rst_closedir(RST_DIR *dirp)
{

        (void)close(dirp->dd_fd);
        free(dirp);
        return;
}

/*
 * Simulate finding the current offset in the directory.
 */
static OFF_T
rst_telldir(RST_DIR *dirp)
{
        return ((OFF_T)LSEEK(dirp->dd_fd,
                (OFF_T)0, SEEK_CUR) - dirp->dd_size + dirp->dd_loc);
}

/*
 * Open a directory file.
 */
static RST_DIR *
opendirfile(const char *name)
{
        RST_DIR *dirp;
        int fd;

        if ((fd = OPEN(name, O_RDONLY)) == -1)
                return (NULL);
        if ((dirp = malloc(sizeof(RST_DIR))) == NULL) {
                (void)close(fd);
                return (NULL);
        }
        dirp->dd_fd = fd;
        dirp->dd_loc = 0;
        return (dirp);
}

/*
 * Set the mode, owner, and times for all new or changed directories
 */
void
setdirmodes(int flags)
{
        FILE *mf;
        struct modeinfo node;
        struct entry *ep;
        char *cp;

        Vprintf(stdout, "Set directory mode, owner, and times.\n");
        if (command == 'r' || command == 'R')
                (void) snprintf(modefile, sizeof(modefile), "%s/rstmode%lu", tmpdir, (long)dumpdate);
        if (modefile[0] == '#') {
                panic("modefile not defined\n");
                fprintf(stderr, "directory mode, owner, and times not set\n");
                return;
        }
        mf = fopen(modefile, "r");
        if (mf == NULL) {
                warn("fopen");
                fprintf(stderr, "cannot open mode file %s\n", modefile);
                fprintf(stderr, "directory mode, owner, and times not set\n");
                return;
        }
        clearerr(mf);
        for (;;) {
                (void) fread((char *)&node, 1, sizeof(struct modeinfo), mf);
                if (feof(mf))
                        break;
                ep = lookupino(node.ino);
                if (command == 'i' || command == 'x') {
                        if (ep == NULL)
                                continue;
                        if ((flags & FORCE) == 0 && ep->e_flags & EXISTED) {
                                ep->e_flags &= ~NEW;
                                continue;
                        }
                        if ((flags & FORCE) == 0 &&
                            node.ino == ROOTINO &&
                            reply("set owner/mode for '.'") == FAIL)
                                continue;
                }
                if (ep == NULL) {
                        panic("cannot find directory inode %d\n", node.ino);
                } else {
                        cp = myname(ep);
                        (void) chown(cp, node.uid, node.gid);
                        (void) chmod(cp, node.mode);
                        if (node.flags)
#ifdef  __linux__
                                (void) lsetflags(cp, node.flags);
#else
#ifdef sunos
#else
                                (void) chflags(cp, node.flags);
#endif
#endif
                        utimes(cp, node.timep);
                        ep->e_flags &= ~NEW;
                }
        }
        if (ferror(mf))
                panic("error setting directory modes\n");
        (void) fclose(mf);
}

/*
 * In restore -C mode, tests the attributes for all directories
 */
void
comparedirmodes(void)
{
        FILE *mf;
        struct modeinfo node;
        struct entry *ep;
        char *cp;

        Vprintf(stdout, "Compare directories modes, owner, attributes.\n");
        if (modefile[0] == '#') {
                panic("modefile not defined\n");
                fprintf(stderr, "directory mode, owner, and times not set\n");
                return;
        }
        mf = fopen(modefile, "r");
        if (mf == NULL) {
                warn("fopen");
                fprintf(stderr, "cannot open mode file %s\n", modefile);
                fprintf(stderr, "directory mode, owner, and times not set\n");
                return;
        }
        clearerr(mf);
        for (;;) {
                (void) fread((char *)&node, 1, sizeof(struct modeinfo), mf);
                if (feof(mf))
                        break;
                ep = lookupino(node.ino);
                if (ep == NULL) {
                        panic("cannot find directory inode %d\n", node.ino);
                } else {
                        cp = myname(ep);
                        struct STAT sb;
                        unsigned long newflags;

                        if (LSTAT(cp, &sb) < 0) {
                                warn("unable to stat %s", cp);
                                do_compare_error;
                                continue;
                        }

                        Vprintf(stdout, "comparing directory %s\n", cp);

                        if (sb.st_mode != node.mode) {
                                fprintf(stderr, "%s: mode changed from 0%o to 0%o.\n",
                                        cp, node.mode & 07777, sb.st_mode & 07777);
                                do_compare_error;
                        }
                        if (sb.st_uid != node.uid) {
                                fprintf(stderr, "%s: uid changed from %d to %d.\n",
                                        cp, node.uid, sb.st_uid);
                                do_compare_error;
                        }
                        if (sb.st_gid != node.gid) {
                                fprintf(stderr, "%s: gid changed from %d to %d.\n",
                                        cp, node.gid, sb.st_gid);
                                do_compare_error;
                        }
#ifdef  __linux__
                        if (lgetflags(cp, &newflags) < 0) {
                                if (node.flags != 0) {
                                        warn("%s: lgetflags failed", cp);
                                        do_compare_error;
                                }
                        }
                        else {
                                if (newflags != node.flags) {
                                        fprintf(stderr, "%s: flags changed from 0x%08x to 0x%08lx.\n",
                                                cp, node.flags, newflags);
                                        do_compare_error;
                                }
                        }
#endif
                        ep->e_flags &= ~NEW;
                }
        }
        if (ferror(mf))
                panic("error setting directory modes\n");
        (void) fclose(mf);
}

/*
 * Generate a literal copy of a directory.
 */
int
genliteraldir(char *name, dump_ino_t ino)
{
        struct inotab *itp;
        int ofile, dp, i, size;
        char buf[BUFSIZ];

        itp = inotablookup(ino);
        if (itp == NULL)
                panic("Cannot find directory inode %d named %s\n", ino, name);
        if ((ofile = open(name, O_WRONLY | O_CREAT | O_TRUNC, 0666)) < 0) {
                warn("%s: cannot create file\n", name);
                return (FAIL);
        }
        rst_seekdir(dirp, itp->t_seekpt, itp->t_seekpt);
        dp = dup(dirp->dd_fd);
        for (i = itp->t_size; i > 0; i -= BUFSIZ) {
                size = i < BUFSIZ ? i : BUFSIZ;
                if (read(dp, buf, (int) size) == -1) {
                        warnx("write error extracting inode %lu, name %s\n",
                                (unsigned long)curfile.ino, curfile.name);
                        err(1, "read");
                }
                if (!Nflag && write(ofile, buf, (int) size) == -1) {
                        warnx("write error extracting inode %lu, name %s\n",
                                (unsigned long)curfile.ino, curfile.name);
                        err(1, "write");
                }
        }
        (void) close(dp);
        (void) close(ofile);
        return (GOOD);
}

/*
 * Determine the type of an inode
 */
int
inodetype(dump_ino_t ino)
{
        struct inotab *itp;

        itp = inotablookup(ino);
        if (itp == NULL)
                return (LEAF);
        return (NODE);
}

/*
 * Allocate and initialize a directory inode entry.
 * If requested, save its pertinent mode, owner, and time info.
 */
static struct inotab *
#if defined(__linux__) || defined(sunos)
allocinotab(dump_ino_t ino, OFF_T seekpt)
#else
allocinotab(dump_ino_t ino, OFF_T seekpt)
#endif
{
        struct inotab   *itp;

        itp = calloc(1, sizeof(struct inotab));
        if (itp == NULL)
                panic("no memory directory table\n");
        itp->t_next = inotab[INOHASH(ino)];
        inotab[INOHASH(ino)] = itp;
        itp->t_ino = ino;
        itp->t_seekpt = seekpt;
        return itp;
}

static void
#if defined(__linux__) || defined(sunos)
savemodeinfo(dump_ino_t ino, struct new_bsd_inode *dip) {
#else
savemodeinfo(dump_ino_t ino, struct dinode *dip) {
#endif
        struct modeinfo node;

        if (mf == NULL)
                return;
        node.ino = ino;
#if defined(__linux__) || defined(sunos)
        node.timep[0].tv_sec = dip->di_atime.tv_sec;
        node.timep[0].tv_usec = dip->di_atime.tv_usec;
        node.timep[1].tv_sec = dip->di_mtime.tv_sec;
        node.timep[1].tv_usec = dip->di_mtime.tv_usec;
#else   /* __linux__  || sunos */
        node.timep[0].tv_sec = dip->di_atime;
        node.timep[0].tv_usec = dip->di_atimensec / 1000;
        node.timep[1].tv_sec = dip->di_mtime;
        node.timep[1].tv_usec = dip->di_mtimensec / 1000;
#endif  /* __linux__  || sunos */
        node.mode = dip->di_mode;
        node.flags = dip->di_flags;
        node.uid = dip->di_uid;
        node.gid = dip->di_gid;
        if ( fwrite((char *)&node, 1, sizeof(struct modeinfo), mf) != sizeof(struct modeinfo) )
                err(1,"cannot write to file %s", modefile);
}

/*
 * Look up an inode in the table of directories
 */
static struct inotab *
inotablookup(dump_ino_t ino)
{
        struct inotab *itp;

        for (itp = inotab[INOHASH(ino)]; itp != NULL; itp = itp->t_next)
                if (itp->t_ino == ino)
                        return (itp);
        return (NULL);
}

/*
 * Clean up and exit
 */
void
cleanup(void)
{
        closemt();
        if (modefile[0] != '#')
                (void) unlink(modefile);
        if (dirfile[0] != '#')
                (void) unlink(dirfile);
}