external/bsd/ntp/dist/lib/isc/unix/fsaccess.c

   1 /*      $NetBSD$        */
   2
   3 /*
   4  * Copyright (C) 2004-2007  Internet Systems Consortium, Inc. ("ISC")
   5  * Copyright (C) 2000, 2001  Internet Software Consortium.
   6  *
   7  * Permission to use, copy, modify, and/or distribute this software for any
   8  * purpose with or without fee is hereby granted, provided that the above
   9  * copyright notice and this permission notice appear in all copies.
  10  *
  11  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
  12  * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
  13  * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
  14  * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
  15  * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
  16  * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  17  * PERFORMANCE OF THIS SOFTWARE.
  18  */
  19
  20 /* Id: fsaccess.c,v 1.13 2007/06/19 23:47:18 tbox Exp */
  21
  22 #include <config.h>
  23
  24 #include <sys/types.h>
  25 #include <sys/stat.h>
  26
  27 #include <errno.h>
  28
  29 #include "errno2result.h"
  30
  31 /*! \file
  32  * \brief
  33  * The OS-independent part of the API is in lib/isc.
  34  */
  35 #include "../fsaccess.c"
  36
  37 isc_result_t
  38 isc_fsaccess_set(const char *path, isc_fsaccess_t access) {
  39         struct stat statb;
  40         mode_t mode;
  41         isc_boolean_t is_dir = ISC_FALSE;
  42         isc_fsaccess_t bits;
  43         isc_result_t result;
  44
  45         if (stat(path, &statb) != 0)
  46                 return (isc__errno2result(errno));
  47
  48         if ((statb.st_mode & S_IFDIR) != 0)
  49                 is_dir = ISC_TRUE;
  50         else if ((statb.st_mode & S_IFREG) == 0)
  51                 return (ISC_R_INVALIDFILE);
  52
  53         result = check_bad_bits(access, is_dir);
  54         if (result != ISC_R_SUCCESS)
  55                 return (result);
  56
  57         /*
  58          * Done with checking bad bits.  Set mode_t.
  59          */
  60         mode = 0;
  61
  62 #define SET_AND_CLEAR1(modebit) \
  63         if ((access & bits) != 0) { \
  64                 mode |= modebit; \
  65                 access &= ~bits; \
  66         }
  67 #define SET_AND_CLEAR(user, group, other) \
  68         SET_AND_CLEAR1(user); \
  69         bits <<= STEP; \
  70         SET_AND_CLEAR1(group); \
  71         bits <<= STEP; \
  72         SET_AND_CLEAR1(other);
  73
  74         bits = ISC_FSACCESS_READ | ISC_FSACCESS_LISTDIRECTORY;
  75
  76         SET_AND_CLEAR(S_IRUSR, S_IRGRP, S_IROTH);
  77
  78         bits = ISC_FSACCESS_WRITE |
  79                ISC_FSACCESS_CREATECHILD |
  80                ISC_FSACCESS_DELETECHILD;
  81
  82         SET_AND_CLEAR(S_IWUSR, S_IWGRP, S_IWOTH);
  83
  84         bits = ISC_FSACCESS_EXECUTE |
  85                ISC_FSACCESS_ACCESSCHILD;
  86
  87         SET_AND_CLEAR(S_IXUSR, S_IXGRP, S_IXOTH);
  88
  89         INSIST(access == 0);
  90
  91         if (chmod(path, mode) < 0)
  92                 return (isc__errno2result(errno));
  93
  94         return (ISC_R_SUCCESS);
  95 }