/*      $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);
}