src/bin/mkdir/mkdir.c

/*	$OpenBSD: mkdir.c,v 1.31 2019/06/28 13:34:59 deraadt Exp $	*/
/*	$NetBSD: mkdir.c,v 1.14 1995/06/25 21:59:21 mycroft Exp $	*/

/*
 * Copyright (c) 1983, 1992, 1993
 *	The Regents of the University of California.  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 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.
 */

#include <sys/types.h>
#include <sys/stat.h>

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

extern char *__progname;

int	mkpath(char *, mode_t, mode_t);
static void __dead usage(void);

int
main(int argc, char *argv[])
{
	int ch, rv, exitval, pflag;
	void *set;
	mode_t mode, dir_mode;

	/*
	 * The default file mode is a=rwx (0777) with selected permissions
	 * removed in accordance with the file mode creation mask.  For
	 * intermediate path name components, the mode is the default modified
	 * by u+wx so that the subdirectories can always be created.
	 */
	mode = 0777 & ~umask(0);
	dir_mode = mode | S_IWUSR | S_IXUSR;

	pflag = 0;
	while ((ch = getopt(argc, argv, "m:p")) != -1)
		switch(ch) {
		case 'p':
			pflag = 1;
			break;
		case 'm':
			if ((set = setmode(optarg)) == NULL)
				errx(1, "invalid file mode: %s", optarg);
			mode = getmode(set, S_IRWXU | S_IRWXG | S_IRWXO);
			free(set);
			break;
		default:
			usage();
		}
	argc -= optind;
	argv += optind;

	if ((mode & (S_ISUID | S_ISGID | S_ISTXT)) == 0) {
		if (pledge("stdio rpath cpath fattr", NULL) == -1)
			err(1, "pledge");
	}

	if (*argv == NULL)
		usage();

	for (exitval = 0; *argv != NULL; ++argv) {
		char *slash;

		/* Remove trailing slashes, per POSIX. */
		slash = strrchr(*argv, '\0');
		while (--slash > *argv && *slash == '/')
			*slash = '\0';

		if (pflag) {
			rv = mkpath(*argv, mode, dir_mode);
		} else {
			rv = mkdir(*argv, mode);
			/*
			 * The mkdir() and umask() calls both honor only the
			 * low nine bits, so if you try to set a mode including
			 * the sticky, setuid, setgid bits you lose them. Don't
			 * do this unless the user has specifically requested
			 * a mode as chmod will (obviously) ignore the umask.
			 */
			if (rv == 0 && mode > 0777)
				rv = chmod(*argv, mode);
		}
		if (rv == -1) {
			warn("%s", *argv);
			exitval = 1;
		}
	}
	return exitval;
}

/*
 * mkpath -- create directories.
 *	path     - path
 *	mode     - file mode of terminal directory
 *	dir_mode - file mode of intermediate directories
 */
int
mkpath(char *path, mode_t mode, mode_t dir_mode)
{
	struct stat sb;
	char *slash;
	int done;

	slash = path;

	for (;;) {
		slash += strspn(slash, "/");
		slash += strcspn(slash, "/");

		done = (*slash == '\0');
		*slash = '\0';

		if (mkdir(path, done ? mode : dir_mode) == 0) {
			if (mode > 0777 && chmod(path, mode) == -1)
				return (-1);
		} else {
			int mkdir_errno = errno;

			if (stat(path, &sb) == -1) {
				/* Not there; use mkdir()s errno */
				errno = mkdir_errno;
				return (-1);
			}
			if (!S_ISDIR(sb.st_mode)) {
				/* Is there, but isn't a directory */
				errno = ENOTDIR;
				return (-1);
			}
		}

		if (done)
			break;

		*slash = '/';
	}

	return (0);
}

static void __dead
usage(void)
{
	(void)fprintf(stderr, "usage: %s [-p] [-m mode] directory ...\n",
	    __progname);
	exit(1);
}