sbin/mount_devfs/mount_devfs.c

   1 /*
   2  * Copyright (c) 2009 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Alex Hornung <ahornung@gmail.com>
   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  *
  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
  15  *    the documentation and/or other materials provided with the
  16  *    distribution.
  17  * 3. Neither the name of The DragonFly Project nor the names of its
  18  *    contributors may be used to endorse or promote products derived
  19  *    from this software without specific, prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  25  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  30  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  31  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 #include <sys/param.h>
  36 #include <sys/mount.h>
  37 #include <sys/devfs.h>
  38
  39 #include <err.h>
  40 #include <mntopts.h>
  41 #include <stdio.h>
  42 #include <stdlib.h>
  43 #include <string.h>
  44 #include <sysexits.h>
  45 #include <unistd.h>
  46
  47 #if 0
  48 #define MOPT_UPDATE         { "update",     0, MNT_UPDATE, 0 }
  49 #endif
  50 #define MOPT_DEVFSOPTS          \
  51         { "ruleset=", 0, DEVFS_MNT_RULESET, 1 },        \
  52         { "jail", 0, DEVFS_MNT_JAIL, 1 }
  53
  54
  55 struct mntopt mopts[] = {
  56         MOPT_STDOPTS,
  57         MOPT_DEVFSOPTS,
  58 #if 0
  59         MOPT_UPDATE,
  60 #endif
  61         MOPT_NULL
  62 };
  63
  64 static void     usage(void);
  65
  66 int
  67 main(int argc, char **argv)
  68 {
  69         struct statfs sfb;
  70         struct devfs_mount_info info;
  71         int ch, mntflags;
  72         char *ptr, *mntto;
  73         char mntpoint[MAXPATHLEN];
  74         char rule_file[MAXPATHLEN];
  75         struct vfsconf vfc;
  76         int error;
  77         info.flags = 0;
  78         int i,k;
  79         int mounted = 0;
  80
  81         mntflags = 0;
  82
  83         while ((ch = getopt(argc, argv, "o:")) != -1)
  84                 switch(ch) {
  85                 case 'o':
  86                         getmntopts(optarg, mopts, &mntflags, &info.flags);
  87                         ptr = strstr(optarg, "ruleset=");
  88                         if (ptr) {
  89                                 ptr += 8;
  90                                 for (i = 0, k = 0;
  91                                     (i < MAXPATHLEN) && (ptr[i] != '\0') && (ptr[i] != ',');
  92                                     i++) {
  93                                         rule_file[k++] = ptr[i];
  94
  95                                 }
  96                                 rule_file[k] = '\0';
  97                         }
  98                         break;
  99                 case '?':
 100                 default:
 101                         usage();
 102                 }
 103         argc -= optind;
 104         argv += optind;
 105
 106         if (argc < 1)
 107                 usage();
 108
 109         /* resolve mount point with realpath(3) */
 110         switch(argc) {
 111         case 1:
 112                 mntto = argv[0];
 113                 break;
 114         case 2:
 115                 mntto = argv[1];
 116                 break;
 117         default:
 118                 mntto = NULL;
 119                 usage();
 120                 /* NOTREACHED */
 121         }
 122
 123         checkpath(mntto, mntpoint);
 124
 125         error = getvfsbyname("devfs", &vfc);
 126         if (error && vfsisloadable("devfs")) {
 127                 if(vfsload("devfs"))
 128                         err(EX_OSERR, "vfsload(devfs)");
 129                 endvfsent();
 130                 error = getvfsbyname("devfs", &vfc);
 131         }
 132         if (error)
 133                 errx(EX_OSERR, "devfs filesystem is not available");
 134
 135         error = statfs(mntpoint, &sfb);
 136
 137         if (error)
 138                 err(EX_OSERR, "could not statfs() the mount point");
 139
 140         if ((!strcmp(sfb.f_fstypename, "devfs")) &&
 141             (!strcmp(sfb.f_mntfromname, "devfs"))) {
 142                 mounted = 1;
 143         }
 144
 145         if (!mounted) {
 146                 if (mount(vfc.vfc_name, mntpoint, mntflags, &info))
 147                         err(1, NULL);
 148         } else {
 149                 if (fork() == 0) {
 150                         execlp("devfsctl", "devfsctl",
 151                             "-m", mntpoint,
 152                                 "-c",
 153                                 "-r",
 154                                 NULL);
 155                 }
 156         }
 157
 158         if (info.flags & DEVFS_MNT_RULESET) {
 159                 if (fork() == 0) {
 160                         execlp("devfsctl", "devfsctl",
 161                             "-m", mntpoint,
 162                                 "-a",
 163                                 "-f", rule_file,
 164                             NULL);
 165                 }
 166         }
 167         exit(0);
 168 }
 169
 170 static void
 171 usage(void)
 172 {
 173         fprintf(stderr,
 174             "usage: mount_devfs [-o options] [mount_from] mount_point\n");
 175         exit(1);
 176 }