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copydir.c

/*
 * Copyright 1991 - 1994, 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: copydir.c 6 2005-03-20 15:34:28Z bubulle $")


#include <sys/stat.h>

#include <sys/types.h>
#include <fcntl.h>
#include <stdio.h>

#include "prototypes.h"
#include "defines.h"

static const char *src_orig;
static const char *dst_orig;

struct      link_name {
      dev_t ln_dev;
      ino_t ln_ino;
      int   ln_count;
      char  *ln_name;
      struct      link_name *ln_next;
};
static      struct      link_name *links;

/*
 * remove_link - delete a link from the link list
 */

static void
remove_link(struct link_name *ln)
{
      struct link_name *lp;

      if (links == ln) {
            links = ln->ln_next;
            free (ln->ln_name);
            free (ln);
            return;
      }
      for (lp = links;lp;lp = lp->ln_next)
            if (lp->ln_next == ln)
                  break;

      if (! lp)
            return;

      lp->ln_next = lp->ln_next->ln_next;
      free (ln->ln_name);
      free (ln);
}

/*
 * check_link - see if a file is really a link
 */

static struct link_name *
check_link(const char *name, const struct stat *sb)
{
      struct      link_name *lp;
      int   src_len;
      int   dst_len;
      int   name_len;
      int len;

      for (lp = links;lp;lp = lp->ln_next)
            if (lp->ln_dev == sb->st_dev && lp->ln_ino == sb->st_ino)
                  return lp;

      if (sb->st_nlink == 1)
            return 0;

      lp = (struct link_name *) xmalloc (sizeof *lp);
      src_len = strlen (src_orig);
      dst_len = strlen (dst_orig);
      name_len = strlen (name);
      lp->ln_dev = sb->st_dev;
      lp->ln_ino = sb->st_ino;
      lp->ln_count = sb->st_nlink;
      len = name_len - src_len + dst_len + 1;
      lp->ln_name = xmalloc(len);
      snprintf(lp->ln_name, len, "%s%s", dst_orig, name + src_len);
      lp->ln_next = links;
      links = lp;

      return 0;
}

/*
 * copy_tree - copy files in a directory tree
 *
 *    copy_tree() walks a directory tree and copies ordinary files
 *    as it goes.
 */

int
copy_tree(const char *src_root, const char *dst_root, uid_t uid, gid_t gid)
{
      char  src_name[1024];
      char  dst_name[1024];
      char  buf[1024];
      int   ifd;
      int   ofd;
      int   err = 0;
      int   cnt;
      int   set_orig = 0;
      struct      DIRECT      *ent;
      struct      stat  sb;
      struct      link_name *lp;
      DIR   *dir;

      /*
       * Make certain both directories exist.  This routine is called
       * after the home directory is created, or recursively after the
       * target is created.  It assumes the target directory exists.
       */

      if (access(src_root, F_OK) != 0 || access(dst_root, F_OK) != 0)
            return -1;

      /*
       * Open the source directory and read each entry.  Every file
       * entry in the directory is copied with the UID and GID set
       * to the provided values.  As an added security feature only
       * regular files (and directories ...) are copied, and no file
       * is made set-ID.
       */

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

      if (src_orig == 0) {
            src_orig = src_root;
            dst_orig = dst_root;
            set_orig++;
      }
      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 (src_root) + strlen (ent->d_name) + 2 > sizeof src_name) {
                  err++;
                  break;
            }
            snprintf(src_name, sizeof src_name, "%s/%s", src_root, ent->d_name);

            if (strlen (dst_root) + strlen (ent->d_name) + 2 > sizeof dst_name) {
                  err++;
                  break;
            }
            snprintf(dst_name, sizeof dst_name, "%s/%s", dst_root, ent->d_name);

            if (LSTAT(src_name, &sb) == -1)
                  continue;

            if (S_ISDIR(sb.st_mode)) {

                  /*
                   * Create a new target directory, make it owned by
                   * the user and then recursively copy that directory.
                   */

                  mkdir (dst_name, sb.st_mode & 0777);
                  chown (dst_name, uid == (uid_t) -1 ? sb.st_uid:uid,
                        gid == (gid_t) -1 ? sb.st_gid:gid);

                  if (copy_tree (src_name, dst_name, uid, gid)) {
                        err++;
                        break;
                  }
                  continue;
            }
#ifdef      S_IFLNK
            /*
             * Copy any symbolic links
             */

            if (S_ISLNK(sb.st_mode)) {
                  char  oldlink[1024];
                  char  dummy[1024];
                  int   len;

                  /*
                   * Get the name of the file which the link points
                   * to.  If that name begins with the original
                   * source directory name, that part of the link
                   * name will be replaced with the original
                   * destinateion directory name.
                   */

                  if ((len = readlink(src_name, oldlink, sizeof(oldlink) - 1)) < 0) {
                        err++;
                        break;
                  }
                  oldlink[len] = '\0';  /* readlink() does not NUL-terminate */
                  if (!strncmp(oldlink, src_orig, strlen(src_orig))) {
                        snprintf(dummy, sizeof dummy, "%s%s",
                               dst_orig, oldlink + strlen(src_orig));
                        strcpy(oldlink, dummy);
                  }
                  if (symlink(oldlink, dst_name)) {
                        err++;
                        break;
                  }
                  continue;
            }
#endif

            /*
             * See if this is a previously copied link
             */

            if ((lp = check_link (src_name, &sb))) {
                  if (link (lp->ln_name, dst_name)) {
                        err++;
                        break;
                  }
                  if (unlink (src_name)) {
                        err++;
                        break;
                  }
                  if (--lp->ln_count <= 0)
                        remove_link (lp);

                  continue;
            }

            /*
             * Deal with FIFOs and special files.  The user really
             * shouldn't have any of these, but it seems like it
             * would be nice to copy everything ...
             */

            if (!S_ISREG(sb.st_mode)) {
                  if (mknod (dst_name, sb.st_mode & ~07777, sb.st_rdev) ||
                        chown (dst_name, uid == (uid_t) -1 ? sb.st_uid:uid,
                              gid == (gid_t) -1 ? sb.st_gid:gid) ||
                              chmod (dst_name, sb.st_mode & 07777)) {
                        err++;
                        break;
                  }
                  continue;
            }

            /*
             * Create the new file and copy the contents.  The new
             * file will be owned by the provided UID and GID values.
             */

            if ((ifd = open (src_name, O_RDONLY)) < 0) {
                  err++;
                  break;
            }
            if ((ofd = open (dst_name, O_WRONLY|O_CREAT|O_TRUNC, 0)) < 0 ||
                  chown (dst_name, uid == (uid_t) -1 ? sb.st_uid:uid,
                              gid == (gid_t) -1 ? sb.st_gid:gid) ||
                        chmod (dst_name, sb.st_mode & 07777)) {
                  close (ifd);
                  err++;
                  break;
            }
            while ((cnt = read (ifd, buf, sizeof buf)) > 0) {
                  if (write (ofd, buf, cnt) != cnt) {
                        cnt = -1;
                        break;
                  }
            }
            close (ifd);
            close (ofd);

            if (cnt == -1) {
                  err++;
                  break;
            }
      }
      closedir (dir);

      if (set_orig) {
            src_orig = 0;
            dst_orig = 0;
      }
      return err ? -1:0;
}

/*
 * remove_tree - remove files in a directory tree
 *
 *    remove_tree() walks a directory tree and deletes all the files
 *    and directories.
 */

int
remove_tree(const char *root)
{
      char  new_name[1024];
      int   err = 0;
      struct      DIRECT      *ent;
      struct      stat  sb;
      DIR   *dir;

      /*
       * Make certain the directory exists.
       */

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

      /*
       * Open the source directory and read each entry.  Every file
       * entry in the directory is copied with the UID and GID set
       * to the provided values.  As an added security feature only
       * regular files (and directories ...) are copied, and no file
       * is made set-ID.
       */

      dir = opendir (root);

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

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

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

            /*
             * Make the filename for the current entry.
             */

            if (strlen (root) + strlen (ent->d_name) + 2 > sizeof new_name) {
                  err++;
                  break;
            }
            snprintf(new_name, sizeof new_name, "%s/%s", root, ent->d_name);
            if (LSTAT(new_name, &sb) == -1)
                  continue;

            if (S_ISDIR(sb.st_mode)) {

                  /*
                   * Recursively delete this directory.
                   */

                  if (remove_tree (new_name)) {
                        err++;
                        break;
                  }
                  if (rmdir (new_name)) {
                        err++;
                        break;
                  }
                  continue;
            }
            unlink (new_name);
      }
      closedir (dir);

      return err ? -1:0;
}

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