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Annotation of embedaddon/ntp/lib/isc/fsaccess.c, revision 1.1.1.1

1.1       misho       1: /*
                      2:  * Copyright (C) 2004, 2005, 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 1.10 2007/06/19 23:47:17 tbox Exp $ */
                     19: 
                     20: /*! \file
                     21:  * \brief
                     22:  * This file contains the OS-independent functionality of the API.
                     23:  */
                     24: #include <isc/fsaccess.h>
                     25: #include <isc/result.h>
                     26: #include <isc/util.h>
                     27: 
                     28: /*!
                     29:  * Shorthand.  Maybe ISC__FSACCESS_PERMISSIONBITS should not even be in
                     30:  * <isc/fsaccess.h>.  Could check consistency with sizeof(isc_fsaccess_t)
                     31:  * and the number of bits in each function.
                     32:  */
                     33: #define STEP           (ISC__FSACCESS_PERMISSIONBITS)
                     34: #define GROUP          (STEP)
                     35: #define OTHER          (STEP * 2)
                     36: 
                     37: void
                     38: isc_fsaccess_add(int trustee, int permission, isc_fsaccess_t *access) {
                     39:        REQUIRE(trustee <= 0x7);
                     40:        REQUIRE(permission <= 0xFF);
                     41: 
                     42:        if ((trustee & ISC_FSACCESS_OWNER) != 0)
                     43:                *access |= permission;
                     44: 
                     45:        if ((trustee & ISC_FSACCESS_GROUP) != 0)
                     46:                *access |= (permission << GROUP);
                     47: 
                     48:        if ((trustee & ISC_FSACCESS_OTHER) != 0)
                     49:                *access |= (permission << OTHER);
                     50: }
                     51: 
                     52: void
                     53: isc_fsaccess_remove(int trustee, int permission, isc_fsaccess_t *access) {
                     54:        REQUIRE(trustee <= 0x7);
                     55:        REQUIRE(permission <= 0xFF);
                     56: 
                     57: 
                     58:        if ((trustee & ISC_FSACCESS_OWNER) != 0)
                     59:                *access &= ~permission;
                     60: 
                     61:        if ((trustee & ISC_FSACCESS_GROUP) != 0)
                     62:                *access &= ~(permission << GROUP);
                     63: 
                     64:        if ((trustee & ISC_FSACCESS_OTHER) != 0)
                     65:                *access &= ~(permission << OTHER);
                     66: }
                     67: 
                     68: static isc_result_t
                     69: check_bad_bits(isc_fsaccess_t access, isc_boolean_t is_dir) {
                     70:        isc_fsaccess_t bits;
                     71: 
                     72:        /*
                     73:         * Check for disallowed user bits.
                     74:         */
                     75:        if (is_dir)
                     76:                bits = ISC_FSACCESS_READ |
                     77:                       ISC_FSACCESS_WRITE |
                     78:                       ISC_FSACCESS_EXECUTE;
                     79:        else
                     80:                bits = ISC_FSACCESS_CREATECHILD |
                     81:                       ISC_FSACCESS_ACCESSCHILD |
                     82:                       ISC_FSACCESS_DELETECHILD |
                     83:                       ISC_FSACCESS_LISTDIRECTORY;
                     84: 
                     85:        /*
                     86:         * Set group bad bits.
                     87:         */
                     88:        bits |= bits << STEP;
                     89:        /*
                     90:         * Set other bad bits.
                     91:         */
                     92:        bits |= bits << STEP;
                     93: 
                     94:        if ((access & bits) != 0) {
                     95:                if (is_dir)
                     96:                        return (ISC_R_NOTFILE);
                     97:                else
                     98:                        return (ISC_R_NOTDIRECTORY);
                     99:        }
                    100: 
                    101:        return (ISC_R_SUCCESS);
                    102: }