1/*	$NetBSD: refuse_lowlevel.c,v 1.4 2022/01/22 08:09:39 pho Exp $	*/
2
3/*
4 * Copyright (c) 2016 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. The name of the author may not be used to endorse or promote
16 *    products derived from this software without specific prior written
17 *    permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
20 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
21 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
23 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
25 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
27 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
28 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
29 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33#if !defined(lint)
34__RCSID("$NetBSD: refuse_lowlevel.c,v 1.4 2022/01/22 08:09:39 pho Exp $");
35#endif /* !lint */
36
37#include <fuse_internal.h>
38#include <fuse_opt.h>
39#include <stddef.h>
40#include <stdio.h>
41#include <stdlib.h>
42#include <string.h>
43
44#define REFUSE_LOWLEVEL_OPT(t, p, v) \
45	{ t, offsetof(struct fuse_cmdline_opts, p), v }
46
47static struct fuse_opt fuse_lowlevel_opts[] = {
48	REFUSE_LOWLEVEL_OPT("-h"       , show_help       , REFUSE_SHOW_HELP_FULL),
49	REFUSE_LOWLEVEL_OPT("--help"   , show_help       , REFUSE_SHOW_HELP_FULL),
50	REFUSE_LOWLEVEL_OPT("-ho"      , show_help       , REFUSE_SHOW_HELP_NO_HEADER),
51	REFUSE_LOWLEVEL_OPT("-V"       , show_version    , 1),
52	REFUSE_LOWLEVEL_OPT("--version", show_version    , 1),
53	REFUSE_LOWLEVEL_OPT("-d"       , debug           , 1),
54	REFUSE_LOWLEVEL_OPT("debug"    , debug           , 1),
55	REFUSE_LOWLEVEL_OPT("-d"       , foreground      , 1),
56	REFUSE_LOWLEVEL_OPT("debug"    , foreground      , 1),
57	REFUSE_LOWLEVEL_OPT("-f"       , foreground      , 1),
58	REFUSE_LOWLEVEL_OPT("-s"       , singlethread    , 1),
59	REFUSE_LOWLEVEL_OPT("fsname="  , nodefault_fsname, 1),
60	FUSE_OPT_KEY       ("fsname="  , FUSE_OPT_KEY_KEEP  ),
61	FUSE_OPT_END
62};
63
64void fuse_lowlevel_version(void)
65{
66	/* XXX: Print something */
67}
68
69void fuse_cmdline_help(void)
70{
71	printf("refuse options:\n"
72		   "    -d, -o debug    enable debug output, implies -f\n"
73		   "    -f              foreground mode\n"
74		   "    -s              single threaded mode (always enabled for now)\n"
75		   "    -o fsname=NAME  explicitly set the name of the file system\n");
76}
77
78static int refuse_lowlevel_opt_proc(void* data, const char *arg, int key,
79									struct fuse_args *outargs)
80{
81	struct fuse_cmdline_opts *opts = data;
82
83	switch (key) {
84	case FUSE_OPT_KEY_NONOPT:
85		if (opts->mountpoint == NULL) {
86			return fuse_opt_add_opt(&opts->mountpoint, arg);
87		}
88		else {
89			(void)fprintf(stderr, "fuse: invalid argument: %s\n", arg);
90			return -1;
91		}
92
93	default:
94		return 1; /* keep the argument */
95	}
96}
97
98static int add_default_fsname(struct fuse_args *args)
99{
100	const char *arg0 = args->argv[0];
101	const char *slash;
102
103	if (arg0 == NULL || arg0[0] == '\0') {
104		return fuse_opt_add_arg(args, "-ofsname=refuse");
105	} else {
106		char *arg;
107		int rv;
108
109		if ((slash = strrchr(arg0, '/')) == NULL) {
110			slash = arg0;
111		} else {
112			slash += 1;
113		}
114
115		if (asprintf(&arg, "-ofsname=refuse:%s", slash) == -1)
116			return -1;
117
118		rv = fuse_opt_add_arg(args, arg);
119		free(arg);
120		return rv;
121	}
122}
123
124int
125__fuse_parse_cmdline(struct fuse_args *args, struct fuse_cmdline_opts *opts)
126{
127	memset(opts, 0, sizeof(*opts));
128
129	/*
130	 * XXX: The single threaded mode is always enabled and cannot be
131	 * disabled. This is because puffs currently does not support
132	 * multithreaded operation.
133	 */
134	opts->singlethread = 1;
135
136	if (fuse_opt_parse(args, opts, fuse_lowlevel_opts,
137					   refuse_lowlevel_opt_proc) == -1)
138		return -1;
139
140	if (!opts->nodefault_fsname) {
141		/* -o fsname=%s is not specified so add a default fsname
142		 * generated from the program basename.
143		 */
144		if (add_default_fsname(args) == -1)
145			return -1;
146	}
147
148	return 0;
149}
150