sbin/mount_ados/mount_ados.c

   1 /* $NetBSD: mount_ados.c,v 1.27 2007/07/16 17:06:52 pooka Exp $ */
   2
   3 /*
   4  * Copyright (c) 1994 Christopher G. Demetriou
   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. All advertising materials mentioning features or use of this software
  16  *    must display the following acknowledgement:
  17  *          This product includes software developed for the
  18  *          NetBSD Project.  See http://www.NetBSD.org/ for
  19  *          information about NetBSD.
  20  * 4. The name of the author may not be used to endorse or promote products
  21  *    derived from this software without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  24  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  25  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  26  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  27  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  28  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  29  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  30  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  31  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  32  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  33  *
  34  * <<Id: LICENSE,v 1.2 2000/06/14 15:57:33 cgd Exp>>
  35  */
  36
  37 #include <sys/cdefs.h>
  38 #ifndef lint
  39 __RCSID("$NetBSD: mount_ados.c,v 1.27 2007/07/16 17:06:52 pooka Exp $");
  40 #endif /* not lint */
  41
  42 #include <sys/param.h>
  43 #include <sys/mount.h>
  44 #include <sys/stat.h>
  45 #include <assert.h>
  46 #include <err.h>
  47 #include <grp.h>
  48 #include <pwd.h>
  49 #include <stdio.h>
  50 #include <stdlib.h>
  51 #include <string.h>
  52 #include <unistd.h>
  53
  54 #include <adosfs/adosfs.h>
  55
  56 #include <mntopts.h>
  57 #include <errno.h>
  58
  59 #include "mountprog.h"
  60
  61 static const struct mntopt mopts[] = {
  62         MOPT_STDOPTS,
  63         MOPT_GETARGS,
  64         MOPT_NULL,
  65 };
  66
  67 int     mount_ados(int argc, char **argv);
  68 static void     usage(void);
  69
  70 #ifndef MOUNT_NOMAIN
  71 int
  72 main(int argc, char **argv)
  73 {
  74         return mount_ados(argc, argv);
  75 }
  76 #endif
  77
  78 int
  79 mount_ados(int argc, char **argv)
  80 {
  81         struct adosfs_args args;
  82         struct stat sb;
  83         mntoptparse_t mp;
  84         int c, mntflags, set_gid, set_uid, set_mask;
  85         char *dev, *dir, canon_dir[MAXPATHLEN], canon_dev[MAXPATHLEN];
  86
  87         mntflags = set_gid = set_uid = set_mask = 0;
  88         (void)memset(&args, '\0', sizeof(args));
  89
  90         while ((c = getopt(argc, argv, "u:g:m:o:")) != -1) {
  91                 switch (c) {
  92                 case 'u':
  93                         args.uid = a_uid(optarg);
  94                         set_uid = 1;
  95                         break;
  96                 case 'g':
  97                         args.gid = a_gid(optarg);
  98                         set_gid = 1;
  99                         break;
 100                 case 'm':
 101                         args.mask = a_mask(optarg);
 102                         set_mask = 1;
 103                         break;
 104                 case 'o':
 105                         mp = getmntopts(optarg, mopts, &mntflags, 0);
 106                         if (mp == NULL)
 107                                 err(1, "getmntopts");
 108                         freemntopts(mp);
 109                         break;
 110                 case '?':
 111                 default:
 112                         usage();
 113                         break;
 114                 }
 115         }
 116
 117         if (optind + 2 != argc)
 118                 usage();
 119
 120         dev = argv[optind];
 121         dir = argv[optind + 1];
 122
 123         if (realpath(dev, canon_dev) == NULL)        /* Check device path */
 124                 err(1, "realpath %s", dev);
 125         if (strncmp(dev, canon_dev, MAXPATHLEN)) {
 126                 warnx("\"%s\" is a relative path.", dev);
 127                 dev = canon_dev;
 128                 warnx("using \"%s\" instead.", dev);
 129         }
 130
 131         if (realpath(dir, canon_dir) == NULL)        /* Check mounton path */
 132                 err(1, "realpath %s", dir);
 133         if (strncmp(dir, canon_dir, MAXPATHLEN)) {
 134                 warnx("\"%s\" is a relative path.", dir);
 135                 dir = canon_dir;
 136                 warnx("using \"%s\" instead.", dir);
 137         }
 138
 139         args.fspec = dev;
 140         if (!set_gid || !set_uid || !set_mask) {
 141                 if (stat(dir, &sb) == -1)
 142                         err(1, "stat %s", dir);
 143
 144                 if (!set_uid)
 145                         args.uid = sb.st_uid;
 146                 if (!set_gid)
 147                         args.gid = sb.st_gid;
 148                 if (!set_mask)
 149                         args.mask = sb.st_mode & (S_IRWXU | S_IRWXG | S_IRWXO);
 150         }
 151
 152         if (mount(MOUNT_ADOSFS, dir, mntflags, &args, sizeof args) == -1)
 153                 if (errno != EROFS)
 154                         err(1, "%s on %s", dev, dir);
 155
 156         if (mntflags & MNT_GETARGS) {
 157                 assert(errno != EROFS);
 158                 printf("uid=%d, gid=%d, mask=0%o\n", args.uid, args.gid,
 159                     args.mask);
 160                 exit(0);
 161         }
 162
 163         mntflags |= MNT_RDONLY;
 164         if (mount(MOUNT_ADOSFS, dir, mntflags, &args, sizeof args) == -1)
 165                 err(1, "%s on %s", dev, dir);
 166
 167         exit (0);
 168 }
 169
 170 static void
 171 usage(void)
 172 {
 173
 174         fprintf(stderr, "usage: mount_ados [-o options] [-u user] [-g group] [-m mask] bdev dir\n");
 175         exit(1);
 176 }