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 1.2 2007/06/11 21:16:23 agc 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
50enum {
51	FlagCheckPerm = 1,
52	FlagKernelCache,
53	FlagNonrootUsers,
54
55	ActionMount,
56	ActionUnmount
57};
58
59/* unmount mount point(s) */
60static int
61refuse_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 meessage */
76static void
77usage(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
91int
92main(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