contrib/bind-9.2.4rc7/lib/isc/unix/fsaccess.c

   1 /*
   2  * Copyright (C) 2004  Internet Systems Consortium, Inc. ("ISC")
   3  * Copyright (C) 2000, 2001  Internet Software Consortium.
   4  *
   5  * Permission to use, copy, modify, and distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
  10  * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
  11  * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
  12  * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
  13  * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
  14  * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  15  * PERFORMANCE OF THIS SOFTWARE.
  16  */
  17
  18 /* $Id: fsaccess.c,v 1.6.2.1 2004/03/09 06:12:10 marka Exp $ */
  19
  20 #include <sys/types.h>
  21 #include <sys/stat.h>
  22
  23 #include <errno.h>
  24
  25 #include "errno2result.h"
  26
  27 /*
  28  * The OS-independent part of the API is in lib/isc.
  29  */
  30 #include "../fsaccess.c"
  31
  32 isc_result_t
  33 isc_fsaccess_set(const char *path, isc_fsaccess_t access) {
  34         struct stat statb;
  35         mode_t mode;
  36         isc_boolean_t is_dir = ISC_FALSE;
  37         isc_fsaccess_t bits;
  38         isc_result_t result;
  39
  40         if (stat(path, &statb) != 0)
  41                 return (isc__errno2result(errno));
  42
  43         if ((statb.st_mode & S_IFDIR) != 0)
  44                 is_dir = ISC_TRUE;
  45         else if ((statb.st_mode & S_IFREG) == 0)
  46                 return (ISC_R_INVALIDFILE);
  47
  48         result = check_bad_bits(access, is_dir);
  49         if (result != ISC_R_SUCCESS)
  50                 return (result);
  51
  52         /*
  53          * Done with checking bad bits.  Set mode_t.
  54          */
  55         mode = 0;
  56
  57 #define SET_AND_CLEAR1(modebit) \
  58         if ((access & bits) != 0) { \
  59                 mode |= modebit; \
  60                 access &= ~bits; \
  61         }
  62 #define SET_AND_CLEAR(user, group, other) \
  63         SET_AND_CLEAR1(user); \
  64         bits <<= STEP; \
  65         SET_AND_CLEAR1(group); \
  66         bits <<= STEP; \
  67         SET_AND_CLEAR1(other);
  68
  69         bits = ISC_FSACCESS_READ | ISC_FSACCESS_LISTDIRECTORY;
  70
  71         SET_AND_CLEAR(S_IRUSR, S_IRGRP, S_IROTH);
  72
  73         bits = ISC_FSACCESS_WRITE |
  74                ISC_FSACCESS_CREATECHILD |
  75                ISC_FSACCESS_DELETECHILD;
  76
  77         SET_AND_CLEAR(S_IWUSR, S_IWGRP, S_IWOTH);
  78
  79         bits = ISC_FSACCESS_EXECUTE |
  80                ISC_FSACCESS_ACCESSCHILD;
  81
  82         SET_AND_CLEAR(S_IXUSR, S_IXGRP, S_IXOTH);
  83
  84         INSIST(access == 0);
  85
  86         if (chmod(path, mode) < 0)
  87                 return (isc__errno2result(errno));
  88
  89         return (ISC_R_SUCCESS);
  90 }