sbin/mount_autofs/mount_autofs.c

   1 /*-
   2  * Copyright (c) 2018 The NetBSD Foundation, Inc.
   3  * All rights reserved.
   4  *
   5  * This code is derived from software contributed to The NetBSD Foundation
   6  * by Christos Zoulas.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  18  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  19  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  20  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  21  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  22  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  23  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  24  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  25  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  26  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  27  * POSSIBILITY OF SUCH DAMAGE.
  28  */
  29
  30 #include <sys/param.h>
  31 #include <sys/mount.h>
  32 #include <sys/cdefs.h>
  33
  34 #include <err.h>
  35 #include <mntopts.h>
  36 #include <stdio.h>
  37 #include <stdlib.h>
  38 #include <string.h>
  39 #include <sysexits.h>
  40 #include <unistd.h>
  41
  42 #include <vfs/autofs/autofs_mount.h>
  43
  44 #include "mount_autofs.h"
  45
  46 static const struct mntopt mopts[] = {
  47         MOPT_STDOPTS,
  48         MOPT_NULL,
  49 };
  50
  51 static void     usage(void) __dead2;
  52
  53 int
  54 main(int argc, char **argv)
  55 {
  56         return mount_autofs(argc, argv);
  57 }
  58
  59 void
  60 mount_autofs_parseargs(int argc, char *argv[], void *v, int *mntflags,
  61         char *canon_dev, char *canon_dir)
  62 {
  63         int ch;
  64         struct autofs_mount_info *am = v;
  65
  66         *mntflags = 0;
  67         while ((ch = getopt(argc, argv, "f:o:O:p:")) != -1)
  68                 switch (ch) {
  69                 case 'f':
  70                         strlcpy(__DECONST(char*, am->from), optarg, MAXPATHLEN);
  71                         break;
  72                 case 'o':
  73                         getmntopts(optarg, mopts, mntflags, 0);
  74                         break;
  75                 case 'O':
  76                         strlcpy(__DECONST(char*, am->master_options), optarg,
  77                             MAXPATHLEN);
  78                         break;
  79                 case 'p':
  80                         strlcpy(__DECONST(char*, am->master_prefix), optarg,
  81                             MAXPATHLEN);
  82                         break;
  83                 case '?':
  84                 default:
  85                         usage();
  86                 }
  87         argc -= optind;
  88         argv += optind;
  89
  90         if (argc != 2)
  91                 usage();
  92
  93         strlcpy(canon_dev, argv[0], MAXPATHLEN);
  94         if (realpath(argv[1], canon_dir) == NULL)    /* Check mounton path */
  95                 err(EXIT_FAILURE, "realpath %s", canon_dir);
  96         if (strncmp(argv[1], canon_dir, MAXPATHLEN)) {
  97                 warnx("\"%s\" is a relative path.", argv[1]);
  98                 warnx("using \"%s\" instead.", canon_dir);
  99         }
 100 }
 101
 102 int
 103 mount_autofs(int argc, char *argv[])
 104 {
 105         char canon_dev[MAXPATHLEN], canon_dir[MAXPATHLEN];
 106         char from[MAXPATHLEN], master_options[MAXPATHLEN];
 107         char master_prefix[MAXPATHLEN];
 108         int mntflags, error;
 109         struct vfsconf vfc;
 110         struct autofs_mount_info am = {
 111                 .from = from,
 112                 .master_options = master_options,
 113                 .master_prefix = master_prefix,
 114         };
 115
 116         mount_autofs_parseargs(argc, argv, &am, &mntflags,
 117             canon_dev, canon_dir);
 118
 119         error = getvfsbyname("autofs", &vfc);
 120         if (error && vfsisloadable("autofs")) {
 121                 if(vfsload("autofs"))
 122                         err(EX_OSERR, "vfsload(%s)", "autofs");
 123                 endvfsent();
 124                 error = getvfsbyname("autofs", &vfc);
 125         }
 126         if (error)
 127                 errx(EX_OSERR, "%s filesystem not available", "autofs");
 128
 129         if (mount(vfc.vfc_name, canon_dir, mntflags, &am) == -1)
 130                 err(EXIT_FAILURE, "autofs on %s", canon_dir);
 131
 132         return EXIT_SUCCESS;
 133 }
 134
 135 static void
 136 usage(void)
 137 {
 138         (void)fprintf(stderr,
 139             "Usage: %s [-o options] [-O master_options] [-p master_prefix] "
 140                 "[-f <from>] autofs mount_point\n", getprogname());
 141         exit(EXIT_FAILURE);
 142 }