1/*-
2 * Copyright (c) 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#if defined(LIBC_SCCS) && !defined(lint)
31static char sccsid[] = "@(#)sysctl.c	8.2 (Berkeley) 1/4/94";
32#endif /* LIBC_SCCS and not lint */
33#include <sys/cdefs.h>
34__FBSDID("$FreeBSD$");
35
36#include <sys/param.h>
37#include <sys/sysctl.h>
38
39#include <errno.h>
40#include <limits.h>
41#include <paths.h>
42#include <stdio.h>
43#include <unistd.h>
44#include <string.h>
45
46extern int __sysctl(const int *name, u_int namelen, void *oldp,
47    size_t *oldlenp, const void *newp, size_t newlen);
48
49int
50sysctl(const int *name, u_int namelen, void *oldp, size_t *oldlenp,
51    const void *newp, size_t newlen)
52{
53	int retval;
54	size_t orig_oldlen;
55
56	orig_oldlen = oldlenp ? *oldlenp : 0;
57	retval = __sysctl(name, namelen, oldp, oldlenp, newp, newlen);
58	/*
59	 * All valid names under CTL_USER have a dummy entry in the sysctl
60	 * tree (to support name lookups and enumerations) with an
61	 * empty/zero value, and the true value is supplied by this routine.
62	 * For all such names, __sysctl() is used solely to validate the
63	 * name.
64	 *
65	 * Return here unless there was a successful lookup for a CTL_USER
66	 * name.
67	 */
68	if (retval || name[0] != CTL_USER)
69		return (retval);
70
71	if (newp != NULL) {
72		errno = EPERM;
73		return (-1);
74	}
75	if (namelen != 2) {
76		errno = EINVAL;
77		return (-1);
78	}
79
80	switch (name[1]) {
81	case USER_CS_PATH:
82		if (oldp && orig_oldlen < sizeof(_PATH_STDPATH)) {
83			errno = ENOMEM;
84			return -1;
85		}
86		*oldlenp = sizeof(_PATH_STDPATH);
87		if (oldp != NULL)
88			memmove(oldp, _PATH_STDPATH, sizeof(_PATH_STDPATH));
89		return (0);
90	}
91
92	if (oldp && *oldlenp < sizeof(int)) {
93		errno = ENOMEM;
94		return (-1);
95	}
96	*oldlenp = sizeof(int);
97	if (oldp == NULL)
98		return (0);
99
100	switch (name[1]) {
101	case USER_BC_BASE_MAX:
102		*(int *)oldp = BC_BASE_MAX;
103		return (0);
104	case USER_BC_DIM_MAX:
105		*(int *)oldp = BC_DIM_MAX;
106		return (0);
107	case USER_BC_SCALE_MAX:
108		*(int *)oldp = BC_SCALE_MAX;
109		return (0);
110	case USER_BC_STRING_MAX:
111		*(int *)oldp = BC_STRING_MAX;
112		return (0);
113	case USER_COLL_WEIGHTS_MAX:
114		*(int *)oldp = COLL_WEIGHTS_MAX;
115		return (0);
116	case USER_EXPR_NEST_MAX:
117		*(int *)oldp = EXPR_NEST_MAX;
118		return (0);
119	case USER_LINE_MAX:
120		*(int *)oldp = LINE_MAX;
121		return (0);
122	case USER_RE_DUP_MAX:
123		*(int *)oldp = RE_DUP_MAX;
124		return (0);
125	case USER_POSIX2_VERSION:
126		*(int *)oldp = _POSIX2_VERSION;
127		return (0);
128	case USER_POSIX2_C_BIND:
129#ifdef POSIX2_C_BIND
130		*(int *)oldp = 1;
131#else
132		*(int *)oldp = 0;
133#endif
134		return (0);
135	case USER_POSIX2_C_DEV:
136#ifdef	POSIX2_C_DEV
137		*(int *)oldp = 1;
138#else
139		*(int *)oldp = 0;
140#endif
141		return (0);
142	case USER_POSIX2_CHAR_TERM:
143#ifdef	POSIX2_CHAR_TERM
144		*(int *)oldp = 1;
145#else
146		*(int *)oldp = 0;
147#endif
148		return (0);
149	case USER_POSIX2_FORT_DEV:
150#ifdef	POSIX2_FORT_DEV
151		*(int *)oldp = 1;
152#else
153		*(int *)oldp = 0;
154#endif
155		return (0);
156	case USER_POSIX2_FORT_RUN:
157#ifdef	POSIX2_FORT_RUN
158		*(int *)oldp = 1;
159#else
160		*(int *)oldp = 0;
161#endif
162		return (0);
163	case USER_POSIX2_LOCALEDEF:
164#ifdef	POSIX2_LOCALEDEF
165		*(int *)oldp = 1;
166#else
167		*(int *)oldp = 0;
168#endif
169		return (0);
170	case USER_POSIX2_SW_DEV:
171#ifdef	POSIX2_SW_DEV
172		*(int *)oldp = 1;
173#else
174		*(int *)oldp = 0;
175#endif
176		return (0);
177	case USER_POSIX2_UPE:
178#ifdef	POSIX2_UPE
179		*(int *)oldp = 1;
180#else
181		*(int *)oldp = 0;
182#endif
183		return (0);
184	case USER_STREAM_MAX:
185		*(int *)oldp = FOPEN_MAX;
186		return (0);
187	case USER_TZNAME_MAX:
188		*(int *)oldp = NAME_MAX;
189		return (0);
190	default:
191		errno = EINVAL;
192		return (-1);
193	}
194	/* NOTREACHED */
195}
196