NetBSD/usr.sbin/fusermount/fusermount.c

159 lines
4.0 KiB
C

/*
* 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);
}