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      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
     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
     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 *
     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