sbin/mount/fattr.c

   1 /* $NetBSD: fattr.c,v 1.10 2009/06/19 12:55:45 stacktic Exp $ */
   2
   3 /*-
   4  * Copyright (c) 2000 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  *
  16  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  17  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  18  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  19  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  20  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  26  * POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 #include <sys/cdefs.h>
  30 #ifndef lint
  31 __RCSID("$NetBSD: fattr.c,v 1.10 2009/06/19 12:55:45 stacktic Exp $");
  32 #endif /* not lint */
  33
  34 #include <sys/param.h>
  35 #include <sys/mount.h>
  36 #include <sys/stat.h>
  37 #include <err.h>
  38 #include <grp.h>
  39 #include <pwd.h>
  40 #include <stdio.h>
  41 #include <stdlib.h>
  42 #include <string.h>
  43 #include <unistd.h>
  44
  45 #include "mountprog.h"
  46
  47 int
  48 a_num(const char *s, const char *id_type)
  49 {
  50         int id;
  51         char *ep;
  52
  53         id = strtol(s, &ep, 0);
  54         if (*ep || s == ep || id < 0)
  55                 errx(1, "unknown %s id: %s", id_type, s);
  56         return id;
  57 }
  58
  59 gid_t
  60 a_gid(const char *s)
  61 {
  62         struct group *gr;
  63
  64         if ((gr = getgrnam(s)) != NULL)
  65                 return gr->gr_gid;
  66         return a_num(s, "group");
  67 }
  68
  69 uid_t
  70 a_uid(const char *s)
  71 {
  72         struct passwd *pw;
  73
  74         if ((pw = getpwnam(s)) != NULL)
  75                 return pw->pw_uid;
  76         return a_num(s, "user");
  77 }
  78
  79 mode_t
  80 a_mask(const char *s)
  81 {
  82         int rv;
  83         char *ep;
  84
  85         rv = strtol(s, &ep, 8);
  86         if (s == ep || *ep || rv < 0)
  87                 errx(1, "invalid file mode: %s", s);
  88         return rv;
  89 }