find_one.c

/*
   Bacula(R) - The Network Backup Solution

   Copyright (C) 2000-2022 Kern Sibbald

   The original author of Bacula is Kern Sibbald, with contributions
   from many others, a complete list can be found in the file AUTHORS.

   You may use this file and others of this release according to the
   license defined in the LICENSE file, which includes the Affero General
   Public License, v3.0 ("AGPLv3") and some additional permissions and
   terms pursuant to its AGPLv3 Section 7.

   This notice must be preserved when any source code is
   conveyed and/or propagated.

   Bacula(R) is a registered trademark of Kern Sibbald.
*/
/*

   This file was derived from GNU TAR source code. Except for a few key
   ideas, it has been entirely rewritten for Bacula.

      Kern Sibbald, MM

   Thanks to the TAR programmers.

 */

#include "bacula.h"
#include "find.h"
#if defined(HAVE_LINUX_OS) && defined(HAVE_NODUMP)
  #include <linux/ioctl.h>
  #include <linux/fs.h>
#endif
#ifdef HAVE_DARWIN_OS
#include <sys/param.h>
#include <sys/mount.h>
#include <sys/attr.h>
#endif

int breaddir(DIR *dirp, POOLMEM *&d_name);

extern int32_t name_max;              /* filename max length */
extern int32_t path_max;              /* path name max length */

/*
 * Structure for keeping track of hard linked files, we
 *   keep an entry for each hardlinked file that we save,
 *   which is the first one found. For all the other files that
 *   are linked to this one, we save only the directory
 *   entry so we can link it.
 */
struct f_link {
    struct f_link *next;
    dev_t dev;                        /* device */
    ino_t ino;                        /* inode with device is unique */
    int32_t FileIndex;                /* Bacula FileIndex of this file */
    int32_t digest_stream;            /* Digest type if needed */
    uint32_t digest_len;              /* Digest len if needed */
    char *digest;                     /* Checksum of the file if needed */
    char name[1];                     /* The name */
};

typedef struct f_link link_t;
#define LINK_HASHTABLE_BITS 16
#define LINK_HASHTABLE_SIZE (1<<LINK_HASHTABLE_BITS)
#define LINK_HASHTABLE_MASK (LINK_HASHTABLE_SIZE-1)

static inline int LINKHASH(const struct stat &info)
{
    int hash = info.st_dev;
    unsigned long long i = info.st_ino;
    hash ^= i;
    i >>= 16;
    hash ^= i;
    i >>= 16;
    hash ^= i;
    i >>= 16;
    hash ^= i;
    return hash & LINK_HASHTABLE_MASK;
}

/*
 * Create a new directory Find File packet, but copy
 *   some of the essential info from the current packet.
 *   However, be careful to zero out the rest of the
 *   packet.
 */
static FF_PKT *new_dir_ff_pkt(FF_PKT *ff_pkt)
{
   FF_PKT *dir_ff_pkt = (FF_PKT *)bmalloc(sizeof(FF_PKT));
   memcpy((void*)dir_ff_pkt, (void*)ff_pkt, sizeof(FF_PKT));

   /* Do not duplicate pointers */
   dir_ff_pkt->fname = bstrdup(ff_pkt->fname);
   dir_ff_pkt->snap_fname = bstrdup(ff_pkt->snap_fname);
   dir_ff_pkt->link = bstrdup(ff_pkt->link);

   if (ff_pkt->fname_save) {
      dir_ff_pkt->fname_save = get_pool_memory(PM_FNAME);
      pm_strcpy(dir_ff_pkt->fname_save, ff_pkt->fname_save);
   }
   if (ff_pkt->link_save) {
      dir_ff_pkt->link_save = get_pool_memory(PM_FNAME);
      pm_strcpy(dir_ff_pkt->link_save, ff_pkt->link_save);
   }

   dir_ff_pkt->included_files_list = NULL;
   dir_ff_pkt->excluded_files_list = NULL;
   dir_ff_pkt->excluded_paths_list = NULL;
   dir_ff_pkt->linkhash = NULL;
   dir_ff_pkt->ignoredir_fname = NULL;
   return dir_ff_pkt;
}

/*
 * Free the temp directory ff_pkt
 */
static void free_dir_ff_pkt(FF_PKT *dir_ff_pkt)
{
   free(dir_ff_pkt->fname);
   free(dir_ff_pkt->snap_fname);
   free(dir_ff_pkt->link);
   if (dir_ff_pkt->fname_save) {
      free_pool_memory(dir_ff_pkt->fname_save);
   }
   if (dir_ff_pkt->link_save) {
      free_pool_memory(dir_ff_pkt->link_save);
   }
   free(dir_ff_pkt);
}

/*
 * Check to see if we allow the file system type of a file or directory.
 * If we do not have a list of file system types, we accept anything.
 */
static int accept_fstype(FF_PKT *ff, void *dummy) {
   int i;
   char fs[1000];
   bool accept = true;

   if (ff->fstypes.size()) {
      accept = false;
      if (!fstype(ff, fs, sizeof(fs))) {
         Dmsg1(50, "Cannot determine file system type for \"%s\"\n", ff->fname);
      } else {
         for (i = 0; i < ff->fstypes.size(); ++i) {
            if (strcmp(fs, (char *)ff->fstypes.get(i)) == 0) {
               Dmsg2(100, "Accepting fstype %s for \"%s\"\n", fs, ff->fname);
               accept = true;
               break;
            }
            Dmsg3(200, "fstype %s for \"%s\" does not match %s\n", fs,
                  ff->fname, ff->fstypes.get(i));
         }
      }
   }
   return accept;
}

/*
 * Check to see if we allow the drive type of a file or directory.
 * If we do not have a list of drive types, we accept anything.
 */
static int accept_drivetype(FF_PKT *ff, void *dummy) {
   int i;
   char dt[100];
   bool accept = true;

   if (ff->drivetypes.size()) {
      accept = false;
      /* fname is a better choice here than snap_fname */
      if (!drivetype(ff->fname, dt, sizeof(dt))) {
         Dmsg1(50, "Cannot determine drive type for \"%s\"\n", ff->fname);
      } else {
         for (i = 0; i < ff->drivetypes.size(); ++i) {
            if (strcmp(dt, (char *)ff->drivetypes.get(i)) == 0) {
               Dmsg2(100, "Accepting drive type %s for \"%s\"\n", dt, ff->fname);
               accept = true;
               break;
            }
            Dmsg3(200, "drive type %s for \"%s\" does not match %s\n", dt,
                  ff->fname, ff->drivetypes.get(i));
         }
      }
   }
   return accept;
}

/*
 * This function determines whether we can use getattrlist()
 * It's odd, but we have to use the function to determine that...
 * Also, the man pages talk about things as if they were implemented.
 *
 * On Mac OS X, this succesfully differentiates between HFS+ and UFS
 * volumes, which makes me trust it is OK for others, too.
 */
static bool volume_has_attrlist(const char *fname)
{
#ifdef HAVE_DARWIN_OS
   struct statfs st;
   struct volinfo_struct {
      unsigned long length;               /* Mandatory field */
      vol_capabilities_attr_t info;       /* Volume capabilities */
   } vol;
   struct attrlist attrList;

   memset(&attrList, 0, sizeof(attrList));
   attrList.bitmapcount = ATTR_BIT_MAP_COUNT;
   attrList.volattr = ATTR_VOL_INFO | ATTR_VOL_CAPABILITIES;
   if (statfs(fname, &st) == 0) {
      /* We need to check on the mount point */
      if (getattrlist(st.f_mntonname, &attrList, &vol, sizeof(vol), FSOPT_NOFOLLOW) == 0
            && (vol.info.capabilities[VOL_CAPABILITIES_INTERFACES] & VOL_CAP_INT_ATTRLIST)
            && (vol.info.valid[VOL_CAPABILITIES_INTERFACES] & VOL_CAP_INT_ATTRLIST)) {
         return true;
      }
   }
#endif
   return false;
}

/*
 * check for BSD nodump flag
 */
static bool no_dump(JCR *jcr, FF_PKT *ff_pkt)
{
#ifdef HAVE_NODUMP
   bool ret = false; /* do backup */
   int attr;
   int fd = -1;
   if (ff_pkt->flags & FO_HONOR_NODUMP) {
      int fd = open(ff_pkt->fname, O_RDONLY);
      if (fd < 0) {
         Dmsg2(50, "Failed to open file: %s err: %d\n",
               ff_pkt->fname, errno);
         goto bail_out;
      }

      int ioctl_ret = ioctl(fd, FS_IOC_GETFLAGS, &attr);
      if (ioctl_ret < 0) {
         if (errno == ENOTTY) {
            Dmsg2(50, "Failed to check for NODUMP flag for file: %s errno: %d, "
                      "probably because of wrong filesystem used.\n",
                  ff_pkt->fname, errno);
         } else {
            Dmsg2(50, "Failed to send Getflags IOCTL for: %s err: %d\n",
                  ff_pkt->fname, errno);
         }
         goto bail_out;
      }

      /* Check if file has NODUMP flag set */
      ret = attr & FS_NODUMP_FL;
   }

bail_out:
   if (fd > 0) {
      close(fd);
   }
   Dmsg2(500, "fname: %s nodump flag: %d\n", ff_pkt->fname, ret);
   return ret;

#elif defined(HAVE_CHFLAGS) && defined(UF_NODUMP)
   if ( (ff_pkt->flags & FO_HONOR_NODUMP) &&
        (ff_pkt->statp.st_flags & UF_NODUMP) ) {
      Jmsg(jcr, M_INFO, 1, _("     NODUMP flag set - will not process %s\n"),
           ff_pkt->fname);
      return true;                    /* do not backup this file */
   }
#endif
   return false; /* do backup */
}

/* check if a file have changed during backup and display an error */
bool has_file_changed(JCR *jcr, FF_PKT *ff_pkt)
{
   struct stat statp;
   Dmsg1(500, "has_file_changed fname=%s\n",ff_pkt->fname);

   if (ff_pkt->snapshot_convert_fct) {
      /* their is no reason to check for a file change inside a snapshot */
      /* but this has already highlighted some bugs in the past */
      /* if you want to optimize, uncomment the "return below" */
      // return false;
   }

   if (ff_pkt->type != FT_REG) { /* not a regular file */
      return false;
   }

   if (lstat(ff_pkt->snap_fname, &statp) != 0) {
      berrno be;
      Jmsg(jcr, M_WARNING, 0,
           _("Cannot stat file %s: ERR=%s\n"),ff_pkt->fname,be.bstrerror());
      return true;
   }

   if (statp.st_mtime != ff_pkt->statp.st_mtime) {
      Jmsg(jcr, M_ERROR, 0, _("%s mtime changed during backup.\n"), ff_pkt->fname);
      Dmsg3(50, "%s mtime (%lld) changed during backup (%lld).\n", ff_pkt->fname,
            (int64_t)ff_pkt->statp.st_mtime, (int64_t)statp.st_mtime);
      return true;
   }

   if (statp.st_ctime != ff_pkt->statp.st_ctime) {
      Jmsg(jcr, M_ERROR, 0, _("%s ctime changed during backup.\n"), ff_pkt->fname);
      Dmsg3(50, "%s ctime (%lld) changed during backup (%lld).\n", ff_pkt->fname,
            (int64_t)ff_pkt->statp.st_ctime, (int64_t)statp.st_ctime);
      return true;
   }

   if ((int64_t)statp.st_size != (int64_t)ff_pkt->statp.st_size) {
      Jmsg(jcr, M_ERROR, 0, _("%s size of %lld changed during backup to %lld.\n"),ff_pkt->fname,
         (int64_t)ff_pkt->statp.st_size, (int64_t)statp.st_size);
      Dmsg3(50, "%s size (%lld) changed during backup (%lld).\n", ff_pkt->fname,
            (int64_t)ff_pkt->statp.st_size, (int64_t)statp.st_size);
      return true;
   }

   return false;
}

/*
 * For incremental/differential or accurate backups, we
 *   determine if the current file has changed.
 */
bool check_changes(JCR *jcr, FF_PKT *ff_pkt)
{
   /* in special mode (like accurate backup), the programmer can
    * choose his comparison function.
    */
   if (ff_pkt->check_fct) {
      return ff_pkt->check_fct(jcr, ff_pkt);
   }

   /* For normal backups (incr/diff), we use this default
    * behaviour
    */
   if (ff_pkt->incremental &&
       (ff_pkt->statp.st_mtime < ff_pkt->save_time &&
        ((ff_pkt->flags & FO_MTIMEONLY) ||
         ff_pkt->statp.st_ctime < ff_pkt->save_time)))
   {
      return false;
   }

   return true;
}

static bool have_ignoredir(FF_PKT *ff_pkt)
{
   struct stat sb;
   char *ignoredir;

   /* Ensure that pointers are defined */
   if (!ff_pkt->fileset || !ff_pkt->fileset->incexe) {
      return false;
   }
   ignoredir = ff_pkt->fileset->incexe->ignoredir;

   if (ignoredir) {
      if (!ff_pkt->ignoredir_fname) {
         ff_pkt->ignoredir_fname = get_pool_memory(PM_FNAME);
      }
      Mmsg(ff_pkt->ignoredir_fname, "%s/%s", ff_pkt->fname, ignoredir);
      if (stat(ff_pkt->ignoredir_fname, &sb) == 0) {
         Dmsg2(100, "Directory '%s' ignored (found %s)\n",
               ff_pkt->fname, ignoredir);
         return true;      /* Just ignore this directory */
      }
   }
   return false;
}

/*
 * When the current file is a hardlink, the backup code can compute
 * the checksum and store it into the link_t structure.
 */
void
ff_pkt_set_link_digest(FF_PKT *ff_pkt,
                       int32_t digest_stream, const char *digest, uint32_t len)
{
   if (ff_pkt->linked && !ff_pkt->linked->digest) {     /* is a hardlink */
      ff_pkt->linked->digest = (char *) bmalloc(len);
      memcpy(ff_pkt->linked->digest, digest, len);
      ff_pkt->linked->digest_len = len;
      ff_pkt->linked->digest_stream = digest_stream;
   }
}

/*
 * Find a single file.
 * handle_file is the callback for handling the file.
 * p is the filename
 * parent_device is the device we are currently on
 * top_level is 1 when not recursing or 0 when
 *  descending into a directory.
 */
int
find_one_file(JCR *jcr, FF_PKT *ff_pkt,
               int handle_file(JCR *jcr, FF_PKT *ff, bool top_level),
               char *fname, char *snap_fname, dev_t parent_device, bool top_level)
{
   struct utimbuf restore_times;
   int rtn_stat;
   int len;

   ff_pkt->fname = ff_pkt->link = fname;
   ff_pkt->snap_fname = snap_fname;

   if (lstat(snap_fname, &ff_pkt->statp) != 0) {
       /* Cannot stat file */
       ff_pkt->type = FT_NOSTAT;
       ff_pkt->ff_errno = errno;
       return handle_file(jcr, ff_pkt, top_level);
   }

   Dmsg1(300, "File ----: %s\n", fname);

   /* Save current times of this directory in case we need to
    * reset them because the user doesn't want them changed.
    */
   restore_times.actime = ff_pkt->statp.st_atime;
   restore_times.modtime = ff_pkt->statp.st_mtime;

   /*
    * We check for allowed fstypes and drivetypes at top_level and fstype change (below).
    */
   if (top_level) {
      if (!accept_fstype(ff_pkt, NULL)) {
         ff_pkt->type = FT_INVALIDFS;
         if (ff_pkt->flags & FO_KEEPATIME && !ff_pkt->snapshot_convert_fct) {
            utime(snap_fname, &restore_times);  /* snap_fname == fname */
         }

         char fs[100];

         if (!fstype(ff_pkt, fs, sizeof(fs))) {
             bstrncpy(fs, "unknown", sizeof(fs));
         }

         Jmsg(jcr, M_INFO, 0, _("Top level directory \"%s\" has unlisted fstype \"%s\"\n"), fname, fs);
         return 1;      /* Just ignore this error - or the whole backup is cancelled */
      }
      if (!accept_drivetype(ff_pkt, NULL)) {
         ff_pkt->type = FT_INVALIDDT;
         if (ff_pkt->flags & FO_KEEPATIME && !ff_pkt->snapshot_convert_fct) {
            utime(snap_fname, &restore_times); /* snap_fname == fname */
         }

         char dt[100];

         if (!drivetype(ff_pkt->fname, dt, sizeof(dt))) {
             bstrncpy(dt, "unknown", sizeof(dt));
         }

         Jmsg(jcr, M_INFO, 0, _("Top level directory \"%s\" has an unlisted drive type \"%s\"\n"), fname, dt);
         return 1;      /* Just ignore this error - or the whole backup is cancelled */
      }
      ff_pkt->volhas_attrlist = volume_has_attrlist(snap_fname);
   }

   /*
    * Ignore this entry if no_dump() returns true
    */
   if (no_dump(jcr, ff_pkt)) {
           Dmsg1(100, "'%s' ignored (NODUMP flag set)\n",
                 ff_pkt->fname);
           return 1;
   }

   /*
    * If this is an Incremental backup, see if file was modified
    * since our last "save_time", presumably the last Full save
    * or Incremental.
    */
   if (   !S_ISDIR(ff_pkt->statp.st_mode)
       && !check_changes(jcr, ff_pkt))
   {
      Dmsg1(500, "Non-directory incremental: %s\n", ff_pkt->fname);
      ff_pkt->type = FT_NOCHG;
      return handle_file(jcr, ff_pkt, top_level);
   }

#ifdef HAVE_DARWIN_OS
   if (ff_pkt->flags & FO_HFSPLUS && ff_pkt->volhas_attrlist
         && S_ISREG(ff_pkt->statp.st_mode)) {
       /* TODO: initialise attrList once elsewhere? */
       struct attrlist attrList;
       memset(&attrList, 0, sizeof(attrList));
       attrList.bitmapcount = ATTR_BIT_MAP_COUNT;
       attrList.commonattr = ATTR_CMN_FNDRINFO;
       attrList.fileattr = ATTR_FILE_RSRCLENGTH;
       if (getattrlist(snap_fname, &attrList, &ff_pkt->hfsinfo,
                sizeof(ff_pkt->hfsinfo), FSOPT_NOFOLLOW) != 0) {
          ff_pkt->type = FT_NOSTAT;
          ff_pkt->ff_errno = errno;
          return handle_file(jcr, ff_pkt, top_level);
       }
       return -1; /* ignore */
   }
#endif

   ff_pkt->LinkFI = 0;
   /*
    * Handle hard linked files
    *
    * Maintain a list of hard linked files already backed up. This
    *  allows us to ensure that the data of each file gets backed
    *  up only once.
    */
   if (!(ff_pkt->flags & FO_NO_HARDLINK)
       && ff_pkt->statp.st_nlink > 1
       && (S_ISREG(ff_pkt->statp.st_mode)
           || S_ISCHR(ff_pkt->statp.st_mode)
           || S_ISBLK(ff_pkt->statp.st_mode)
           || S_ISFIFO(ff_pkt->statp.st_mode)
           || S_ISSOCK(ff_pkt->statp.st_mode))) {

       struct f_link *lp;
       if (ff_pkt->linkhash == NULL) {
           ff_pkt->linkhash = (link_t **)bmalloc(LINK_HASHTABLE_SIZE * sizeof(link_t *));
           memset(ff_pkt->linkhash, 0, LINK_HASHTABLE_SIZE * sizeof(link_t *));
       }
       const int linkhash = LINKHASH(ff_pkt->statp);

      /* Search link list of hard linked files */
       for (lp = ff_pkt->linkhash[linkhash]; lp; lp = lp->next)
         if (lp->ino == (ino_t)ff_pkt->statp.st_ino &&
             lp->dev == (dev_t)ff_pkt->statp.st_dev) {
             /* If we have already backed up the hard linked file don't do it again */
             if (strcmp(lp->name, fname) == 0) {
                Dmsg2(400, "== Name identical skip FI=%d file=%s\n", lp->FileIndex, fname);
                return 1;             /* ignore */
             }
             ff_pkt->link = lp->name;
             ff_pkt->type = FT_LNKSAVED;       /* Handle link, file already saved */
             ff_pkt->LinkFI = lp->FileIndex;
             ff_pkt->linked = 0;
             ff_pkt->digest = lp->digest;
             ff_pkt->digest_stream = lp->digest_stream;
             ff_pkt->digest_len = lp->digest_len;
             rtn_stat = handle_file(jcr, ff_pkt, top_level);
             Dmsg3(400, "FT_LNKSAVED FI=%d LinkFI=%d file=%s\n",
                ff_pkt->FileIndex, lp->FileIndex, lp->name);
             return rtn_stat;
         }

      /* File not previously dumped. Chain it into our list. */
      len = strlen(fname) + 1;
      lp = (struct f_link *)bmalloc(sizeof(struct f_link) + len);
      lp->digest = NULL;                /* set later */
      lp->digest_stream = 0;            /* set later */
      lp->digest_len = 0;               /* set later */
      lp->ino = ff_pkt->statp.st_ino;
      lp->dev = ff_pkt->statp.st_dev;
      lp->FileIndex = 0;                  /* set later */
      bstrncpy(lp->name, fname, len);
      lp->next = ff_pkt->linkhash[linkhash];
      ff_pkt->linkhash[linkhash] = lp;
      ff_pkt->linked = lp;            /* mark saved link */
      Dmsg2(400, "added to hash FI=%d file=%s\n", ff_pkt->FileIndex, lp->name);
   } else {
      ff_pkt->linked = NULL;
   }

   /* This is not a link to a previously dumped file, so dump it.  */
   if (S_ISREG(ff_pkt->statp.st_mode)) {
      boffset_t sizeleft;

      sizeleft = ff_pkt->statp.st_size;

      /* Don't bother opening empty, world readable files.  Also do not open
         files when archive is meant for /dev/null.  */
      if (ff_pkt->null_output_device || (sizeleft == 0
              && MODE_RALL == (MODE_RALL & ff_pkt->statp.st_mode))) {
         ff_pkt->type = FT_REGE;
         if (ff_pkt->stat_update) {
            /* No need do the metadata update for empty files, perform usual backup */
            ff_pkt->stat_update = 0;
         }
      } else {
         ff_pkt->type = FT_REG;
      }
      rtn_stat = handle_file(jcr, ff_pkt, top_level);
      if (ff_pkt->linked) {
         ff_pkt->linked->FileIndex = ff_pkt->FileIndex;
      }
      Dmsg3(400, "FT_REG FI=%d linked=%d file=%s\n", ff_pkt->FileIndex,
         ff_pkt->linked ? 1 : 0, fname);
      if (ff_pkt->flags & FO_KEEPATIME && !ff_pkt->snapshot_convert_fct) {
         utime(snap_fname, &restore_times); /* snap_fname == fname */
      }
      return rtn_stat;


   } else if (S_ISLNK(ff_pkt->statp.st_mode)) {  /* soft link */
      int size;
      char *buffer = (char *)alloca(path_max + name_max + 102);

      size = readlink(snap_fname, buffer, path_max + name_max + 101);
      if (size < 0) {
         /* Could not follow link */
         ff_pkt->type = FT_NOFOLLOW;
         ff_pkt->ff_errno = errno;
         rtn_stat = handle_file(jcr, ff_pkt, top_level);
         if (ff_pkt->linked) {
            ff_pkt->linked->FileIndex = ff_pkt->FileIndex;
         }
         return rtn_stat;
      }
      buffer[size] = 0;
      ff_pkt->link = buffer;          /* point to link */
      ff_pkt->type = FT_LNK;          /* got a real link */
      rtn_stat = handle_file(jcr, ff_pkt, top_level);
      if (ff_pkt->linked) {
         ff_pkt->linked->FileIndex = ff_pkt->FileIndex;
      }
      return rtn_stat;

   } else if (S_ISDIR(ff_pkt->statp.st_mode)) {
      DIR *directory;
      POOL_MEM dname(PM_FNAME);
      char *link;
      int link_len;
      int len;
      int status;
      dev_t our_device = ff_pkt->statp.st_dev;
      bool recurse = true;
      bool volhas_attrlist = ff_pkt->volhas_attrlist;    /* Remember this if we recurse */

      /*
       * Ignore this directory and everything below if the file .nobackup
       * (or what is defined for IgnoreDir in this fileset) exists
       */
      if (have_ignoredir(ff_pkt)) {
         return 1; /* Just ignore this directory */
      }

      /* Build a canonical directory name with a trailing slash in link var */
      len = strlen(fname);
      link_len = len + 200;
      link = (char *)bmalloc(link_len + 2);
      bstrncpy(link, fname, link_len);
      /* Strip all trailing slashes */
      while (len >= 1 && IsPathSeparator(link[len - 1]))
        len--;
      link[len++] = '/';             /* add back one */
      link[len] = 0;

      ff_pkt->link = link;
      if (!check_changes(jcr, ff_pkt)) {
         /* Incremental/Full+Base option, directory entry not changed */
         ff_pkt->type = FT_DIRNOCHG;
      } else {
         ff_pkt->type = FT_DIRBEGIN;
      }
      /*
       * We have set st_rdev to 1 if it is a reparse point, otherwise 0,
       *  if st_rdev is 2, it is a mount point
       */
#if defined(HAVE_WIN32)
      /*
       * A reparse point (WIN32_REPARSE_POINT)
       *  is something special like one of the following:
       *  IO_REPARSE_TAG_DFS              0x8000000A
       *  IO_REPARSE_TAG_DFSR             0x80000012
       *  IO_REPARSE_TAG_HSM              0xC0000004
       *  IO_REPARSE_TAG_HSM2             0x80000006
       *  IO_REPARSE_TAG_SIS              0x80000007
       *  IO_REPARSE_TAG_SYMLINK          0xA000000C
       *
       * A junction point is a:
       *  IO_REPARSE_TAG_MOUNT_POINT      0xA0000003
       * which can be either a link to a Volume (WIN32_MOUNT_POINT)
       * or a link to a directory (WIN32_JUNCTION_POINT)
       *
       * Ignore WIN32_REPARSE_POINT and WIN32_JUNCTION_POINT
       */
      if (ff_pkt->statp.st_rdev == WIN32_REPARSE_POINT) {
         ff_pkt->type = FT_REPARSE;
      } else if (ff_pkt->statp.st_rdev == WIN32_JUNCTION_POINT ||
            (ff_pkt->statp.st_rdev == WIN32_SYMLINK_POINT && S_ISDIR(ff_pkt->statp.st_mode))) {
         // Handle SYMLINK DIRECTORY like a Junction, BackupRead() does all the work
         ff_pkt->type = FT_JUNCTION;
      }
#endif
      /*
       * Note, we return the directory to the calling program (handle_file)
       * when we first see the directory (FT_DIRBEGIN.
       * This allows the program to apply matches and make a
       * choice whether or not to accept it.  If it is accepted, we
       * do not immediately save it, but do so only after everything
       * in the directory is seen (i.e. the FT_DIREND).
       */
      rtn_stat = handle_file(jcr, ff_pkt, top_level);
      if (rtn_stat < 1 || ff_pkt->type == FT_REPARSE ||
          ff_pkt->type == FT_JUNCTION) {   /* ignore or error status */
         free(link);
         return rtn_stat;
      }
      /* Done with DIRBEGIN, next call will be DIREND */
      if (ff_pkt->type == FT_DIRBEGIN) {
         ff_pkt->type = FT_DIREND;
      }

      /*
       * Create a temporary ff packet for this directory
       *   entry, and defer handling the directory until
       *   we have recursed into it.  This saves the
       *   directory after all files have been processed, and
       *   during the restore, the directory permissions will
       *   be reset after all the files have been restored.
       */
      Dmsg1(300, "Create temp ff packet for dir: %s\n", ff_pkt->fname);
      FF_PKT *dir_ff_pkt = new_dir_ff_pkt(ff_pkt);
#if defined(HAVE_WIN32)
      if (dir_ff_pkt->root_of_volume || (ff_pkt->fname[3]=='\0' && ff_pkt->fname[1]==':')) {
         /* tell "restore" that this is a root directory and that it should not
          * restore the Windows hidden and system attribute
          */
         dir_ff_pkt->statp.st_rdev = WIN32_ROOT_POINT;
         // don't "propagate" the "root_of_volume" property to sub-directories
         ff_pkt->root_of_volume = false;
      }
#endif

      /*
       * Do not descend into subdirectories (recurse) if the
       * user has turned it off for this directory.
       *
       * If we are crossing file systems, we are either not allowed
       * to cross, or we may be restricted by a list of permitted
       * file systems.
       */
      bool is_win32_mount_point = false;
#if defined(HAVE_WIN32)
      is_win32_mount_point = ff_pkt->statp.st_rdev == WIN32_MOUNT_POINT;
#endif
      if (!top_level && ff_pkt->flags & FO_NO_RECURSION) {
         ff_pkt->type = FT_NORECURSE;
         recurse = false;
      } else if (!top_level &&
            (parent_device != ff_pkt->statp.st_dev || is_win32_mount_point)) {
            /* Nested mountpoint in a Windows snapshot works like the original
             * mountpoint and redirect to the Live filesystem (not a snapshot)
             *
             * In Linux the directory is not a mountpoint anymore and we backup
             * the content of the directory that is normally empty.
             */
         if (is_win32_mount_point && ff_pkt->flags & FO_MULTIFS) {
            return 1;           /* Ignore this dir, it will backed up later */

         } else if (is_win32_mount_point) {
            recurse = false;    /* We backup the mount point itself, but nothing more */

         } else if(!(ff_pkt->flags & FO_MULTIFS)) {
            ff_pkt->type = FT_NOFSCHG;
            recurse = false;

         } else if (!accept_fstype(ff_pkt, NULL)) {
            ff_pkt->type = FT_INVALIDFS;
            recurse = false;

         } else {
            ff_pkt->volhas_attrlist = volume_has_attrlist(snap_fname);
         }
      }
      /* If not recursing, just backup dir and return */
      if (!recurse) {
         rtn_stat = handle_file(jcr, ff_pkt, top_level);
         if (ff_pkt->linked) {
            ff_pkt->linked->FileIndex = ff_pkt->FileIndex;
         }
         free(link);
         free_dir_ff_pkt(dir_ff_pkt);
         ff_pkt->link = ff_pkt->fname;     /* reset "link" */
         if (ff_pkt->flags & FO_KEEPATIME && !ff_pkt->snapshot_convert_fct) {
            utime(snap_fname, &restore_times); /* snap_fname==fname */
         }
         return rtn_stat;
      }

      ff_pkt->link = ff_pkt->fname;     /* reset "link" */

      /*
       * Descend into or "recurse" into the directory to read
       *   all the files in it.
       */
      errno = 0;
      if ((directory = opendir(snap_fname)) == NULL) {
         ff_pkt->type = FT_NOOPEN;
         ff_pkt->ff_errno = errno;
         rtn_stat = handle_file(jcr, ff_pkt, top_level);
         if (ff_pkt->linked) {
            ff_pkt->linked->FileIndex = ff_pkt->FileIndex;
         }
         free(link);
         free_dir_ff_pkt(dir_ff_pkt);
         return rtn_stat;
      }

      /* Build a canonical directory name of the file inside the snapshot,
       * with a trailing slash in link var */
      int slen = strlen(snap_fname);
      int snap_len = slen + 200;
      char *snap_link = (char *)bmalloc(snap_len + 2);
      bstrncpy(snap_link, snap_fname, snap_len);
      /* Strip all trailing slashes */
      while (slen >= 1 && IsPathSeparator(snap_link[slen - 1]))
        slen--;
      snap_link[slen++] = '/';             /* add back one */
      snap_link[slen] = 0;

      /*
       * Process all files in this directory entry (recursing).
       *    This would possibly run faster if we chdir to the directory
       *    before traversing it.
       */
      rtn_stat = 1;
      while (!job_canceled(jcr)) {
         char *p, *q, *s;
         int l;
         int i;

         status = breaddir(directory, dname.addr());
         if (status != 0) {
            /* error or end of directory */
//          Dmsg1(99, "breaddir returned stat=%d\n", status);
            break;
         }
         p = dname.c_str();
         /* Skip `.', `..', and excluded file names.  */
         if (p[0] == '\0' || (p[0] == '.' && (p[1] == '\0' ||
             (p[1] == '.' && p[2] == '\0')))) {
            continue;
         }
         l = strlen(dname.c_str());
         if (l + len >= link_len) {
             link_len = len + l + 1;
             link = (char *)brealloc(link, link_len + 1);
         }
         if (l + slen >= snap_len) {
             snap_len = slen + l + 1;
             snap_link = (char *)brealloc(snap_link, snap_len + 1);
         }

         q = link + len;
         s = snap_link + slen;
         for (i=0; i < l; i++) {
            *q++ = *s++ =*p++;
         }
         *q = *s = 0;
         if (!file_is_excluded(ff_pkt, link)) {
            rtn_stat = find_one_file(jcr, ff_pkt, handle_file, link, snap_link, our_device, false);
            if (ff_pkt->linked) {
               ff_pkt->linked->FileIndex = ff_pkt->FileIndex;
            }
         }

      }
      closedir(directory);
      free(link);
      free(snap_link);

      /*
       * Now that we have recursed through all the files in the
       *  directory, we "save" the directory so that after all
       *  the files are restored, this entry will serve to reset
       *  the directory modes and dates.  Temp directory values
       *  were used without this record.
       */
      handle_file(jcr, dir_ff_pkt, top_level);       /* handle directory entry */
      if (ff_pkt->linked) {
         ff_pkt->linked->FileIndex = dir_ff_pkt->FileIndex;
      }
      free_dir_ff_pkt(dir_ff_pkt);

      if (ff_pkt->flags & FO_KEEPATIME && !ff_pkt->snapshot_convert_fct) {
         utime(snap_fname, &restore_times);
      }
      ff_pkt->volhas_attrlist = volhas_attrlist;      /* Restore value in case it changed. */
      return rtn_stat;
   } /* end check for directory */

   /*
    * If it is explicitly mentioned (i.e. top_level) and is
    *  a block device, we do a raw backup of it or if it is
    *  a fifo, we simply read it.
    */
#ifdef HAVE_FREEBSD_OS
   /*
    * On FreeBSD, all block devices are character devices, so
    *   to be able to read a raw disk, we need the check for
    *   a character device.
    * crw-r----- 1 root  operator - 116, 0x00040002 Jun 9 19:32 /dev/ad0s3
    * crw-r----- 1 root  operator - 116, 0x00040002 Jun 9 19:32 /dev/rad0s3
    */
   if (top_level && (S_ISBLK(ff_pkt->statp.st_mode) || S_ISCHR(ff_pkt->statp.st_mode))) {
#else
   if (top_level && S_ISBLK(ff_pkt->statp.st_mode)) {
#endif
      ff_pkt->type = FT_RAW;          /* raw partition */
   } else if (top_level && S_ISFIFO(ff_pkt->statp.st_mode) &&
              ff_pkt->flags & FO_READFIFO) {
      ff_pkt->type = FT_FIFO;
   } else {
      /* The only remaining types are special (character, ...) files */
      ff_pkt->type = FT_SPEC;
   }
   rtn_stat = handle_file(jcr, ff_pkt, top_level);
   if (ff_pkt->linked) {
      ff_pkt->linked->FileIndex = ff_pkt->FileIndex;
   }
   return rtn_stat;
}

int term_find_one(FF_PKT *ff)
{
   struct f_link *lp, *lc;
   int count = 0;
   int i;


   if (ff->linkhash == NULL) return 0;

   for (i =0 ; i < LINK_HASHTABLE_SIZE; i ++) {
   /* Free up list of hard linked files */
      lp = ff->linkhash[i];
      while (lp) {
         lc = lp;
         lp = lp->next;
         if (lc) {
            if (lc->digest) {
               free(lc->digest);
            }
            free(lc);
            count++;
         }
      }
      ff->linkhash[i] = NULL;
   }
   free(ff->linkhash);
   ff->linkhash = NULL;
   return count;
}