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
refuse_unmount(int argc,char ** argv)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
usage(const char * prog)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
main(int argc,char ** argv)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