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