lib/acl.c

   1 /* acl.c - access control lists
   2
   3    Copyright (C) 2002, 2003 Free Software Foundation, Inc.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 2, or (at your option)
   8    any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program; if not, write to the Free Software Foundation,
  17    Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  18
  19    Written by Paul Eggert.  */
  20
  21 #if HAVE_CONFIG_H
  22 # include <config.h>
  23 #endif
  24
  25 #include <sys/types.h>
  26 #include <sys/stat.h>
  27 #ifndef S_ISLNK
  28 # define S_ISLNK(Mode) 0
  29 #endif
  30
  31 #include "acl.h"
  32
  33 #include <errno.h>
  34 #ifndef ENOSYS
  35 # define ENOSYS (-1)
  36 #endif
  37
  38 #ifndef MIN_ACL_ENTRIES
  39 # define MIN_ACL_ENTRIES 4
  40 #endif
  41
  42 /* Return 1 if PATH has a nontrivial access control list, 0 if not,
  43    and -1 (setting errno) if an error is encountered.  */
  44
  45 int
  46 file_has_acl (char const *path, struct stat const *pathstat)
  47 {
  48   /* FIXME: This implementation should work on recent-enough versions
  49      of HP-UX, Solaris, and Unixware, but it simply returns 0 with
  50      POSIX 1003.1e (draft 17 -- abandoned), AIX, GNU/Linux, Irix, and
  51      Tru64.  Please see Samba's source/lib/sysacls.c file for
  52      fix-related ideas.  */
  53
  54 #if HAVE_ACL && defined GETACLCNT
  55   if (! S_ISLNK (pathstat->st_mode))
  56     {
  57       int n = acl (path, GETACLCNT, 0, NULL);
  58       return n < 0 ? (errno == ENOSYS ? 0 : -1) : (MIN_ACL_ENTRIES < n);
  59     }
  60 #endif
  61
  62   return 0;
  63 }