usr.sbin/fusermount/fusermount.c

   1 /*
   2  * Copyright (c) 2007 Alistair Crooks.  All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  * 3. The name of the author may not be used to endorse or promote
  13  *    products derived from this software without specific prior written
  14  *    permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
  17  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  18  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
  20  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
  22  * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  24  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  25  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  26  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28 #include <sys/cdefs.h>
  29
  30 #ifndef lint
  31 __COPYRIGHT("@(#) Copyright (c) 2007\
  32  The NetBSD Foundation, Inc.  All rights reserved.");
  33 __RCSID("$NetBSD: fusermount.c,v 1.2 2007/06/11 21:16:23 agc Exp $");
  34 #endif
  35
  36 #include <sys/types.h>
  37 #include <sys/param.h>
  38 #include <sys/mount.h>
  39
  40 #include <err.h>
  41 #include <stdio.h>
  42 #include <stdlib.h>
  43 #include <string.h>
  44 #include <unistd.h>
  45
  46 #ifndef FUSERMOUNT_VERSION
  47 #define FUSERMOUNT_VERSION      "2.6.0"
  48 #endif
  49
  50 enum {
  51         FlagCheckPerm = 1,
  52         FlagKernelCache,
  53         FlagNonrootUsers,
  54
  55         ActionMount,
  56         ActionUnmount
  57 };
  58
  59 /* unmount mount point(s) */
  60 static int
  61 refuse_unmount(int argc, char **argv)
  62 {
  63         int     ret;
  64         int     i;
  65
  66         for (ret = 1, i = 0 ; i < argc ; i++) {
  67                 if (unmount(argv[i], 0) < 0) {
  68                         warn("can't unmount `%s'", argv[i]);
  69                         ret = 0;
  70                 }
  71         }
  72         return ret;
  73 }
  74
  75 /* print the usage meessage */
  76 static void
  77 usage(const char *prog)
  78 {
  79         (void) fprintf(stderr,
  80                 "Usage: %s [-c] [-d name] [-h] [-p] [-u] [-x] mountpoint...\n",
  81                 prog);
  82         (void) fprintf(stderr, "\t-c\tuse kernel cache\n");
  83         (void) fprintf(stderr, "\t-d name\tuse name in mount information\n");
  84         (void) fprintf(stderr, "\t-h\tprint help information\n");
  85         (void) fprintf(stderr, "\t-p\tcheck file permissions\n");
  86         (void) fprintf(stderr, "\t-u\tunmount mount point(s)\n");
  87         (void) fprintf(stderr,
  88                 "\t-x\tallow access to mortal (non-root) users\n");
  89 }
  90
  91 int
  92 main(int argc, char **argv)
  93 {
  94         char    *progname;
  95         char    *execme;
  96         int      flags;
  97         int      action;
  98         int      i;
  99
 100         progname = NULL;
 101         flags = 0;
 102         action = ActionMount;
 103         while ((i = getopt(argc, argv, "Vcd:hpux")) != -1) {
 104                 switch(i) {
 105                 case 'V':
 106                         printf("fusermount version: %s\n", FUSERMOUNT_VERSION);
 107                         exit(EXIT_SUCCESS);
 108                         /* NOTREACHED */
 109                 case 'c':
 110                         flags |= FlagKernelCache;
 111                         break;
 112                 case 'd':
 113                         progname = optarg;
 114                         break;
 115                 case 'h':
 116                         usage(*argv);
 117                         exit(EXIT_SUCCESS);
 118                 case 'p':
 119                         flags |= FlagCheckPerm;
 120                         break;
 121                 case 'u':
 122                         action = ActionUnmount;
 123                         break;
 124                 case 'x':
 125                         if (geteuid() != 0) {
 126                                 err(EXIT_FAILURE,
 127                                 "-x option is only allowed for use by root");
 128                         }
 129                         flags |= FlagNonrootUsers;
 130                         break;
 131                 default:
 132                         warnx("Unrecognised argument `%c'", i);
 133                         usage(*argv);
 134                         exit(EXIT_FAILURE);
 135                 }
 136         }
 137         if (optind >= argc - 2) {
 138                 warnx("Not enough command line arguments");
 139                 usage(*argv);
 140                 exit(EXIT_FAILURE);
 141         }
 142         execme = argv[optind + 1];
 143         if (progname) {
 144                 argv[optind + 1] = progname;
 145         }
 146         /* mountpoint = argv[optind]; */
 147         switch(action) {
 148         case ActionMount:
 149                 execvp(execme, &argv[optind + 1]);
 150                 break;
 151         case ActionUnmount:
 152                 if (!refuse_unmount(argc - optind, argv + optind)) {
 153                         exit(EXIT_FAILURE);
 154                 }
 155                 break;
 156         }
 157         exit(EXIT_SUCCESS);
 158 }