fsaccess.c revision 135446 
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 1.6.206.1 2004/03/06 08:14:59 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
32isc_result_t
33isc_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}
91