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chowndir.c

/*
 * Copyright 1992, 1993, Julianne Frances Haugh
 * 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 Julianne F. Haugh 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 JULIE HAUGH 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 JULIE HAUGH 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 <config.h>

#include "rcsid.h"
RCSID("$Id: chowndir.c 6 2005-03-20 15:34:28Z bubulle $")

#include <sys/types.h>
#include <sys/stat.h>
#include "prototypes.h"
#include "defines.h"

#include <fcntl.h>
#include <stdio.h>

/*
 * chown_tree - change ownership of files in a directory tree
 *
 *    chown_dir() walks a directory tree and changes the ownership
 *    of all files owned by the provided user ID.
 */

int
chown_tree(const char *root, uid_t old_uid, uid_t new_uid, gid_t old_gid, gid_t new_gid)
{
      char  new_name[1024];
      int   rc = 0;
      struct      DIRECT      *ent;
      struct      stat  sb;
      DIR   *dir;

      /*
       * Make certain the directory exists.  This routine is called
       * directory by the invoker, or recursively.
       */

      if (access(root, F_OK) != 0)
            return -1;

      /*
       * Open the directory and read each entry.  Every entry is tested
       * to see if it is a directory, and if so this routine is called
       * recursively.  If not, it is checked to see if it is owned by
       * old user ID.
       */

      if (! (dir = opendir (root)))
            return -1;

      while ((ent = readdir (dir))) {

            /*
             * Skip the "." and ".." entries
             */

            if (strcmp (ent->d_name, ".") == 0 ||
                        strcmp (ent->d_name, "..") == 0)
                  continue;

            /*
             * Make the filename for both the source and the
             * destination files.
             */

            if (strlen (root) + strlen (ent->d_name) + 2 > sizeof new_name)
                  break;

            snprintf(new_name, sizeof new_name, "%s/%s", root, ent->d_name);

            /* Don't follow symbolic links! */
            if (LSTAT(new_name, &sb) == -1)
                  continue;

            if (S_ISDIR(sb.st_mode) && !S_ISLNK(sb.st_mode)) {

                  /*
                   * Do the entire subdirectory.
                   */

                  if ((rc = chown_tree (new_name, old_uid, new_uid,
                                    old_gid, new_gid)))
                        break;
            }
#ifndef HAVE_LCHOWN
            /* don't use chown (follows symbolic links!) */
            if (S_ISLNK(sb.st_mode))
                  continue;
#endif
            if (sb.st_uid == old_uid)
                  LCHOWN(new_name, new_uid,
                        sb.st_gid == old_gid ? new_gid:sb.st_gid);
      }
      closedir (dir);

      /*
       * Now do the root of the tree
       */

      if (! stat (root, &sb)) {
            if (sb.st_uid == old_uid)
                  LCHOWN(root, new_uid,
                        sb.st_gid == old_gid ? new_gid:sb.st_gid);
      }
      return rc;
}

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