xref: /titanic_41/usr/src/lib/libc/inc/priv_private.h (revision cb6207858a9fcc2feaee22e626912fba281ac969)
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License (the "License").
6  * You may not use this file except in compliance with the License.
7  *
8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9  * or http://www.opensolaris.org/os/licensing.
10  * See the License for the specific language governing permissions
11  * and limitations under the License.
12  *
13  * When distributing Covered Code, include this CDDL HEADER in each
14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15  * If applicable, add the following below this CDDL HEADER, with the
16  * fields enclosed by brackets "[]" replaced with your own identifying
17  * information: Portions Copyright [yyyy] [name of copyright owner]
18  *
19  * CDDL HEADER END
20  */
21 
22 /*
23  * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
24  * Use is subject to license terms.
25  */
26 
27 #ifndef _PRIV_PRIVATE_H
28 #define	_PRIV_PRIVATE_H
29 
30 #pragma ident	"%Z%%M%	%I%	%E% SMI"
31 
32 #include <sys/types.h>
33 #include <sys/priv.h>
34 #include <limits.h>
35 
36 /*
37  * Libc private privilege data.
38  */
39 
40 #ifdef __cplusplus
41 extern "C" {
42 #endif
43 
44 #define	LOADPRIVDATA(d)		d = __priv_getdata()
45 #define	GETPRIVDATA()		__priv_getdata()
46 #define	LOCKPRIVDATA()		{ \
47 					/* Data already allocated */ \
48 					(void) lock_data(); \
49 					(void) refresh_data(); \
50 				}
51 #define	UNLOCKPRIVDATA()	unlock_data()
52 #define	WITHPRIVLOCKED(t, b, x)	{ \
53 					t __result; \
54 					if (lock_data() != 0) \
55 						return (b); \
56 					__result = (x); \
57 					if (__result == (b) && refresh_data()) \
58 						__result = (x); \
59 					unlock_data(); \
60 					return (__result); \
61 				}
62 
63 /*
64  * Privilege mask macros.
65  */
66 #define	__NBWRD		(CHAR_BIT * sizeof (priv_chunk_t))
67 #define	privmask(n)	(1 << ((__NBWRD - 1) - ((n) % __NBWRD)))
68 #define	privword(n)	((n)/__NBWRD)
69 
70 /*
71  * Same as the functions, but for numeric privileges.
72  */
73 #define	PRIV_ADDSET(a, p)	((priv_chunk_t *)(a))[privword(p)] |= \
74 							privmask(p)
75 #define	PRIV_DELSET(a, p)	((priv_chunk_t *)(a))[privword(p)] &= \
76 							~privmask(p)
77 #define	PRIV_ISMEMBER(a, p)	((((priv_chunk_t *)(a))[privword(p)] & \
78 							privmask(p)) != 0)
79 
80 /*
81  * The structure is static except for the setsort, privnames and nprivs
82  * field.  The pinfo structure initially has sufficient room and the kernel
83  * guarantees no offset changes so we can copy a new structure on top of it.
84  * The locking stratgegy is this: we lock it when we need to reference any
85  * of the volatile fields.
86  */
87 typedef struct priv_data {
88 	size_t			pd_setsize;		/* In bytes */
89 	int			pd_nsets, pd_nprivs;
90 	uint32_t		pd_ucredsize;
91 	char  			**pd_setnames;
92 	char			**pd_privnames;
93 	int			*pd_setsort;
94 	priv_impl_info_t 	*pd_pinfo;
95 	priv_set_t		*pd_basicset;
96 	priv_set_t		*pd_zoneset;
97 } priv_data_t;
98 
99 extern priv_data_t *__priv_getdata(void);
100 extern priv_data_t *__priv_parse_info(priv_impl_info_t *);
101 extern void __priv_free_info(priv_data_t *);
102 extern priv_data_t *privdata;
103 
104 extern int lock_data(void);
105 extern boolean_t refresh_data(void);
106 extern void unlock_data(void);
107 
108 extern boolean_t __priv_isemptyset(priv_data_t *, const priv_set_t *);
109 extern boolean_t __priv_isfullset(priv_data_t *, const priv_set_t *);
110 extern boolean_t __priv_issubset(priv_data_t *, const priv_set_t *,
111 				const priv_set_t *);
112 extern const char *__priv_getbynum(const priv_data_t *, int);
113 
114 extern int getprivinfo(priv_impl_info_t *, size_t);
115 
116 extern priv_set_t *priv_basic(void);
117 
118 #ifdef __cplusplus
119 }
120 #endif
121 
122 #endif /* _PRIV_PRIVATE_H */
123