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      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 
     47 static 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 
     64 void fuse_lowlevel_version(void)
     65 {
     66 	/* XXX: Print something */
     67 }
     68 
     69 void 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 
     78 static 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 
     98 static 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 
    124 int
    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