shadow/libmisc/remove_tree.c

/*
 * Copyright (c) 1991 - 1994, Julianne Frances Haugh
 * Copyright (c) 1996 - 2001, Marek Michałkiewicz
 * Copyright (c) 2003 - 2006, Tomasz Kłoczko
 * Copyright (c) 2007 - 2010, Nicolas François
 * 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. The name of the copyright holders or contributors may not be used to
 *    endorse or promote products derived from this software without
 *    specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT
 * HOLDERS 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>

#ident "$Id$"

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <unistd.h>
#include "prototypes.h"
#include "defines.h"

/*
 * remove_tree - delete a directory tree
 *
 *	remove_tree() walks a directory tree and deletes all the files
 *	and directories.
 *	At the end, it deletes the root directory itself.
 */

int remove_tree (const char *root, bool remove_root)
{
	char *new_name = NULL;
	int err = 0;
	struct DIRECT *ent;
	struct stat sb;
	DIR *dir;

	/*
	 * 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);
	if (NULL == dir) {
		return -1;
	}

	while ((ent = readdir (dir))) {
		size_t new_len = strlen (root) + strlen (ent->d_name) + 2;

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

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

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

		free (new_name);
		new_name = (char *) malloc (new_len);
		if (NULL == new_name) {
			err = -1;
			break;
		}
		(void) snprintf (new_name, new_len, "%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, true) != 0) {
				err = -1;
				break;
			}
		} else {
			/*
			 * Delete the file.
			 */
			if (unlink (new_name) != 0) {
				err = -1;
				break;
			}
		}
	}
	if (NULL != new_name) {
		free (new_name);
	}
	(void) closedir (dir);

	if (remove_root && (0 == err)) {
		if (rmdir (root) != 0) {
			err = -1;
		}
	}

	return err;
}