contrib/bind-9.5.2/lib/isc/unix/fsaccess.c

   1 /*
   2  * Copyright (C) 2004-2007  Internet Systems Consortium, Inc. ("ISC")
   3  * Copyright (C) 2000, 2001  Internet Software Consortium.
   4  *
   5  * Permission to use, copy, modify, and/or 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 1.13 2007/06/19 23:47:18 tbox Exp $ */
  19
  20 #include <config.h>
  21
  22 #include <sys/types.h>
  23 #include <sys/stat.h>
  24
  25 #include <errno.h>
  26
  27 #include "errno2result.h"
  28
  29 /*! \file
  30  * \brief
  31  * The OS-independent part of the API is in lib/isc.
  32  */
  33 #include "../fsaccess.c"
  34
  35 isc_result_t
  36 isc_fsaccess_set(const char *path, isc_fsaccess_t access) {
  37         struct stat statb;
  38         mode_t mode;
  39         isc_boolean_t is_dir = ISC_FALSE;
  40         isc_fsaccess_t bits;
  41         isc_result_t result;
  42
  43         if (stat(path, &statb) != 0)
  44                 return (isc__errno2result(errno));
  45
  46         if ((statb.st_mode & S_IFDIR) != 0)
  47                 is_dir = ISC_TRUE;
  48         else if ((statb.st_mode & S_IFREG) == 0)
  49                 return (ISC_R_INVALIDFILE);
  50
  51         result = check_bad_bits(access, is_dir);
  52         if (result != ISC_R_SUCCESS)
  53                 return (result);
  54
  55         /*
  56          * Done with checking bad bits.  Set mode_t.
  57          */
  58         mode = 0;
  59
  60 #define SET_AND_CLEAR1(modebit) \
  61         if ((access & bits) != 0) { \
  62                 mode |= modebit; \
  63                 access &= ~bits; \
  64         }
  65 #define SET_AND_CLEAR(user, group, other) \
  66         SET_AND_CLEAR1(user); \
  67         bits <<= STEP; \
  68         SET_AND_CLEAR1(group); \
  69         bits <<= STEP; \
  70         SET_AND_CLEAR1(other);
  71
  72         bits = ISC_FSACCESS_READ | ISC_FSACCESS_LISTDIRECTORY;
  73
  74         SET_AND_CLEAR(S_IRUSR, S_IRGRP, S_IROTH);
  75
  76         bits = ISC_FSACCESS_WRITE |
  77                ISC_FSACCESS_CREATECHILD |
  78                ISC_FSACCESS_DELETECHILD;
  79
  80         SET_AND_CLEAR(S_IWUSR, S_IWGRP, S_IWOTH);
  81
  82         bits = ISC_FSACCESS_EXECUTE |
  83                ISC_FSACCESS_ACCESSCHILD;
  84
  85         SET_AND_CLEAR(S_IXUSR, S_IXGRP, S_IXOTH);
  86
  87         INSIST(access == 0);
  88
  89         if (chmod(path, mode) < 0)
  90                 return (isc__errno2result(errno));
  91
  92         return (ISC_R_SUCCESS);
  93 }