1 /* $NetBSD: v25.c,v 1.1 2022/01/22 08:09:40 pho Exp $ */
2
3 /*
4 * Copyright (c) 2021 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: v25.c,v 1.1 2022/01/22 08:09:40 pho Exp $");
35 #endif /* !lint */
36
37 #include <err.h>
38 #include <fuse_internal.h>
39 #include <stdbool.h>
40 #include <string.h>
41
42 int
fuse_mount_v25(const char * mountpoint,struct fuse_args * args)43 fuse_mount_v25(const char *mountpoint, struct fuse_args *args) {
44 struct fuse_chan* chan;
45
46 /* Of course we cannot accurately emulate the semantics, so we
47 * save arguments and use them later in fuse_new(). */
48 chan = fuse_chan_new(mountpoint, args);
49 if (!chan)
50 return -1;
51
52 /* But, the return type of this function is just an int which is
53 * supposed to be a file descriptor. It's too narrow to store a
54 * pointer ofc, so... */
55 return fuse_chan_stash(chan);
56 }
57
58 int
fuse_parse_cmdline_v25(struct fuse_args * args,char ** mountpoint,int * multithreaded,int * foreground)59 fuse_parse_cmdline_v25(struct fuse_args *args, char **mountpoint,
60 int *multithreaded, int *foreground) {
61 struct fuse_cmdline_opts opts;
62
63 if (fuse_parse_cmdline_v30(args, &opts) != 0)
64 return -1;
65
66 *mountpoint = opts.mountpoint; /* Transfer the ownership of the string. */
67 *multithreaded = !opts.singlethread;
68 *foreground = opts.foreground;
69 return 0;
70 }
71
72 /* The interface of fuse_mount() and fuse_new() became even stranger
73 * in FUSE 2.5. Now they both take "struct fuse_args" which are
74 * expected to be identical between those two calls (which isn't
75 * explained clearly in the documentation). Our implementation just
76 * assume they are identical, because we can't recover from situations
77 * where they differ, as there is no obvious way to merge them
78 * together. */
79 struct fuse *
fuse_new_v25(int fd,struct fuse_args * args,const void * op,int op_version,void * user_data)80 fuse_new_v25(int fd, struct fuse_args *args, const void *op,
81 int op_version, void *user_data) {
82 struct fuse_chan* chan;
83 struct fuse_args* mount_args;
84 bool args_differ = false;
85
86 /* But at least we can emit a warning when they differ... */
87 chan = fuse_chan_peek(fd);
88 if (!chan) {
89 warnx("%s: invalid channel: %d", __func__, fd);
90 return NULL;
91 }
92
93 mount_args = fuse_chan_args(chan);
94
95 if (mount_args->argc != args->argc) {
96 args_differ = true;
97 }
98 else {
99 int i;
100
101 for (i = 0; i < args->argc; i++) {
102 if (strcmp(mount_args->argv[i], args->argv[i]) != 0) {
103 args_differ = true;
104 break;
105 }
106 }
107 }
108
109 if (args_differ) {
110 warnx("%s: the argument vector differs from "
111 "that were passed to fuse_mount()", __func__);
112 }
113
114 return fuse_new_v21(fd, NULL, op, op_version, user_data);
115 }
116