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      1 /*
      2  * Copyright (c) 2007 Alistair Crooks.  All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  * 3. The name of the author may not be used to endorse or promote
     13  *    products derived from this software without specific prior written
     14  *    permission.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
     17  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     18  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
     20  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
     22  * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
     24  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
     25  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
     26  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 #include <sys/cdefs.h>
     29 
     30 #ifndef lint
     31 __COPYRIGHT("@(#) Copyright (c) 2007\
     32  The NetBSD Foundation, Inc.  All rights reserved.");
     33 __RCSID("$NetBSD: fusermount.c,v 1.4 2023/04/05 21:53:56 andvar Exp $");
     34 #endif
     35 
     36 #include <sys/types.h>
     37 #include <sys/param.h>
     38 #include <sys/mount.h>
     39 
     40 #include <err.h>
     41 #include <stdio.h>
     42 #include <stdlib.h>
     43 #include <string.h>
     44 #include <unistd.h>
     45 
     46 #ifndef FUSERMOUNT_VERSION
     47 #define FUSERMOUNT_VERSION	"2.6.0"
     48 #endif
     49 
     50 enum {
     51 	FlagCheckPerm = 1,
     52 	FlagKernelCache,
     53 	FlagNonrootUsers,
     54 
     55 	ActionMount,
     56 	ActionUnmount
     57 };
     58 
     59 /* unmount mount point(s) */
     60 static int
     61 refuse_unmount(int argc, char **argv)
     62 {
     63 	int	ret;
     64 	int	i;
     65 
     66 	for (ret = 1, i = 0 ; i < argc ; i++) {
     67 		if (unmount(argv[i], 0) < 0) {
     68 			warn("can't unmount `%s'", argv[i]);
     69 			ret = 0;
     70 		}
     71 	}
     72 	return ret;
     73 }
     74 
     75 /* print the usage message */
     76 static void
     77 usage(const char *prog)
     78 {
     79 	(void) fprintf(stderr,
     80 		"Usage: %s [-c] [-d name] [-h] [-p] [-u] [-x] mountpoint...\n",
     81 		prog);
     82 	(void) fprintf(stderr, "\t-c\tuse kernel cache\n");
     83 	(void) fprintf(stderr, "\t-d name\tuse name in mount information\n");
     84 	(void) fprintf(stderr, "\t-h\tprint help information\n");
     85 	(void) fprintf(stderr, "\t-p\tcheck file permissions\n");
     86 	(void) fprintf(stderr, "\t-u\tunmount mount point(s)\n");
     87 	(void) fprintf(stderr,
     88 		"\t-x\tallow access to mortal (non-root) users\n");
     89 }
     90 
     91 int
     92 main(int argc, char **argv)
     93 {
     94 	char	*progname;
     95 	char	*execme;
     96 	int	 flags;
     97 	int	 action;
     98 	int	 i;
     99 
    100 	progname = NULL;
    101 	flags = 0;
    102 	action = ActionMount;
    103 	while ((i = getopt(argc, argv, "Vcd:hpux")) != -1) {
    104 		switch(i) {
    105 		case 'V':
    106 			printf("fusermount version: %s\n", FUSERMOUNT_VERSION);
    107 			exit(EXIT_SUCCESS);
    108 			/* NOTREACHED */
    109 		case 'c':
    110 			flags |= FlagKernelCache;
    111 			break;
    112 		case 'd':
    113 			progname = optarg;
    114 			break;
    115 		case 'h':
    116 			usage(*argv);
    117 			exit(EXIT_SUCCESS);
    118 		case 'p':
    119 			flags |= FlagCheckPerm;
    120 			break;
    121 		case 'u':
    122 			action = ActionUnmount;
    123 			break;
    124 		case 'x':
    125 			if (geteuid() != 0) {
    126 				err(EXIT_FAILURE,
    127 				"-x option is only allowed for use by root");
    128 			}
    129 			flags |= FlagNonrootUsers;
    130 			break;
    131 		default:
    132 			warnx("Unrecognised argument `%c'", i);
    133 			usage(*argv);
    134 			exit(EXIT_FAILURE);
    135 		}
    136 	}
    137 	if (optind >= argc - 2) {
    138 		warnx("Not enough command line arguments");
    139 		usage(*argv);
    140 		exit(EXIT_FAILURE);
    141 	}
    142 	execme = argv[optind + 1];
    143 	if (progname) {
    144 		argv[optind + 1] = progname;
    145 	}
    146 	/* mountpoint = argv[optind]; */
    147 	switch(action) {
    148 	case ActionMount:
    149 		execvp(execme, &argv[optind + 1]);
    150 		break;
    151 	case ActionUnmount:
    152 		if (!refuse_unmount(argc - optind, argv + optind)) {
    153 			exit(EXIT_FAILURE);
    154 		}
    155 		break;
    156 	}
    157 	exit(EXIT_SUCCESS);
    158 }
    159