/*
* Copyright (c) 2007 Alistair Crooks.  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 author may not be used to endorse or promote
*    products derived from this software without specific prior written
*    permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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/cdefs.h>

#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 2007\
The NetBSD Foundation, Inc.  All rights reserved.");
__RCSID("$NetBSD: fusermount.c,v 1.4 2023/04/05 21:53:56 andvar Exp $");
#endif

#include <sys/types.h>
#include <sys/param.h>
#include <sys/mount.h>

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

#ifndef FUSERMOUNT_VERSION
#define FUSERMOUNT_VERSION      "2.6.0"
#endif

enum {
       FlagCheckPerm = 1,
       FlagKernelCache,
       FlagNonrootUsers,

       ActionMount,
       ActionUnmount
};

/* unmount mount point(s) */
static int
refuse_unmount(int argc, char **argv)
{
       int     ret;
       int     i;

       for (ret = 1, i = 0 ; i < argc ; i++) {
               if (unmount(argv[i], 0) < 0) {
                       warn("can't unmount `%s'", argv[i]);
                       ret = 0;
               }
       }
       return ret;
}

/* print the usage message */
static void
usage(const char *prog)
{
       (void) fprintf(stderr,
               "Usage: %s [-c] [-d name] [-h] [-p] [-u] [-x] mountpoint...\n",
               prog);
       (void) fprintf(stderr, "\t-c\tuse kernel cache\n");
       (void) fprintf(stderr, "\t-d name\tuse name in mount information\n");
       (void) fprintf(stderr, "\t-h\tprint help information\n");
       (void) fprintf(stderr, "\t-p\tcheck file permissions\n");
       (void) fprintf(stderr, "\t-u\tunmount mount point(s)\n");
       (void) fprintf(stderr,
               "\t-x\tallow access to mortal (non-root) users\n");
}

int
main(int argc, char **argv)
{
       char    *progname;
       char    *execme;
       int      flags;
       int      action;
       int      i;

       progname = NULL;
       flags = 0;
       action = ActionMount;
       while ((i = getopt(argc, argv, "Vcd:hpux")) != -1) {
               switch(i) {
               case 'V':
                       printf("fusermount version: %s\n", FUSERMOUNT_VERSION);
                       exit(EXIT_SUCCESS);
                       /* NOTREACHED */
               case 'c':
                       flags |= FlagKernelCache;
                       break;
               case 'd':
                       progname = optarg;
                       break;
               case 'h':
                       usage(*argv);
                       exit(EXIT_SUCCESS);
               case 'p':
                       flags |= FlagCheckPerm;
                       break;
               case 'u':
                       action = ActionUnmount;
                       break;
               case 'x':
                       if (geteuid() != 0) {
                               err(EXIT_FAILURE,
                               "-x option is only allowed for use by root");
                       }
                       flags |= FlagNonrootUsers;
                       break;
               default:
                       warnx("Unrecognised argument `%c'", i);
                       usage(*argv);
                       exit(EXIT_FAILURE);
               }
       }
       if (optind >= argc - 2) {
               warnx("Not enough command line arguments");
               usage(*argv);
               exit(EXIT_FAILURE);
       }
       execme = argv[optind + 1];
       if (progname) {
               argv[optind + 1] = progname;
       }
       /* mountpoint = argv[optind]; */
       switch(action) {
       case ActionMount:
               execvp(execme, &argv[optind + 1]);
               break;
       case ActionUnmount:
               if (!refuse_unmount(argc - optind, argv + optind)) {
                       exit(EXIT_FAILURE);
               }
               break;
       }
       exit(EXIT_SUCCESS);
}