[apple/libc.git] / gen / FreeBSD / sysctl.c

/*-
 * Copyright (c) 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)sysctl.c	8.2 (Berkeley) 1/4/94";
#endif /* LIBC_SCCS and not lint */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/lib/libc/gen/sysctl.c,v 1.6 2007/01/09 00:27:55 imp Exp $");

#include <sys/param.h>
#include <sys/sysctl.h>

#include <errno.h>
#include <limits.h>
#include <paths.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>

#include "sysctl_internal.h"


int
sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp, size_t newlen)
__attribute__((disable_tail_calls))
{
	if (name[0] != CTL_USER) {
		if (namelen == 2 && name[0] == CTL_KERN && name[1] == KERN_EXEC) {
			/*
			 * 7723306: intercept kern.exec and fake a return of
			 * a dummy string ("/" in this case)
			 */
			if (newp != NULL) {
				errno = EPERM;
				return -1;
			}
			if (oldp == NULL) {
				if (oldlenp != NULL) *oldlenp = 2;
				return 0;
			}
			if (oldlenp == NULL) {
				errno = EFAULT;
				return -1;
			}
			if (*oldlenp < 2) {
				errno = ENOMEM;
				return -1;
			}
			memmove(oldp, "/", 2);
			*oldlenp = 2;
			return 0;
		}


		int error = __sysctl(name, namelen, oldp, oldlenp, newp, newlen);
		if (error < 0) {
			return error;
		}


		return error;
	}

	if (newp != NULL) {
		errno = EPERM;
		return (-1);
	}
	if (namelen != 2) {
		errno = EINVAL;
		return (-1);
	}

	switch (name[1]) {
	case USER_CS_PATH:
		if (oldp && *oldlenp < sizeof(_PATH_STDPATH)) {
			errno = ENOMEM;
			return -1;
		}
		*oldlenp = sizeof(_PATH_STDPATH);
		if (oldp != NULL)
			memmove(oldp, _PATH_STDPATH, sizeof(_PATH_STDPATH));
		return (0);
	}

	if (oldp && *oldlenp < sizeof(int)) {
		errno = ENOMEM;
		return (-1);
	}
	*oldlenp = sizeof(int);
	if (oldp == NULL)
		return (0);

	switch (name[1]) {
	case USER_BC_BASE_MAX:
		*(int *)oldp = BC_BASE_MAX;
		return (0);
	case USER_BC_DIM_MAX:
		*(int *)oldp = BC_DIM_MAX;
		return (0);
	case USER_BC_SCALE_MAX:
		*(int *)oldp = BC_SCALE_MAX;
		return (0);
	case USER_BC_STRING_MAX:
		*(int *)oldp = BC_STRING_MAX;
		return (0);
	case USER_COLL_WEIGHTS_MAX:
		*(int *)oldp = COLL_WEIGHTS_MAX;
		return (0);
	case USER_EXPR_NEST_MAX:
		*(int *)oldp = EXPR_NEST_MAX;
		return (0);
	case USER_LINE_MAX:
		*(int *)oldp = LINE_MAX;
		return (0);
	case USER_RE_DUP_MAX:
		*(int *)oldp = RE_DUP_MAX;
		return (0);
	case USER_POSIX2_VERSION:
		*(int *)oldp = _POSIX2_VERSION;
		return (0);
	case USER_POSIX2_C_BIND:
#ifdef POSIX2_C_BIND
		*(int *)oldp = 1;
#else
		*(int *)oldp = 0;
#endif
		return (0);
	case USER_POSIX2_C_DEV:
#ifdef	POSIX2_C_DEV
		*(int *)oldp = 1;
#else
		*(int *)oldp = 0;
#endif
		return (0);
	case USER_POSIX2_CHAR_TERM:
#ifdef	POSIX2_CHAR_TERM
		*(int *)oldp = 1;
#else
		*(int *)oldp = 0;
#endif
		return (0);
	case USER_POSIX2_FORT_DEV:
#ifdef	POSIX2_FORT_DEV
		*(int *)oldp = 1;
#else
		*(int *)oldp = 0;
#endif
		return (0);
	case USER_POSIX2_FORT_RUN:
#ifdef	POSIX2_FORT_RUN
		*(int *)oldp = 1;
#else
		*(int *)oldp = 0;
#endif
		return (0);
	case USER_POSIX2_LOCALEDEF:
#ifdef	POSIX2_LOCALEDEF
		*(int *)oldp = 1;
#else
		*(int *)oldp = 0;
#endif
		return (0);
	case USER_POSIX2_SW_DEV:
#ifdef	POSIX2_SW_DEV
		*(int *)oldp = 1;
#else
		*(int *)oldp = 0;
#endif
		return (0);
	case USER_POSIX2_UPE:
#ifdef	POSIX2_UPE
		*(int *)oldp = 1;
#else
		*(int *)oldp = 0;
#endif
		return (0);
	case USER_STREAM_MAX:
		*(int *)oldp = FOPEN_MAX;
		return (0);
	case USER_TZNAME_MAX:
		*(int *)oldp = NAME_MAX;
		return (0);
	default:
		errno = EINVAL;
		return (-1);
	}
	/* NOTREACHED */
}
Commit	Line	Data
9385eb3d	1	/*-
e9ce8d39 A	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.
e9ce8d39 A	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
9385eb3d A	30	#if defined(LIBC_SCCS) && !defined(lint)
	31	static char sccsid[] = "@(#)sysctl.c 8.2 (Berkeley) 1/4/94";
	32	#endif /* LIBC_SCCS and not lint */
	33	#include <sys/cdefs.h>
1f2f436a	34	__FBSDID("$FreeBSD: src/lib/libc/gen/sysctl.c,v 1.6 2007/01/09 00:27:55 imp Exp $");
e9ce8d39 A	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>
9385eb3d A	44	#include <string.h>
9385eb3d A	45
a9aaacca A	46	#include "sysctl_internal.h"
a9aaacca A	47
e9ce8d39 A	48
e9ce8d39 A	49	int
974e3884 A	50	sysctl(int name, u_int namelen, void oldp, size_t oldlenp, void newp, size_t newlen)
974e3884 A	51	__attribute__((disable_tail_calls))
e9ce8d39	52	{
ad3c9f2a A	53	if (name[0] != CTL_USER) {
	54	if (namelen == 2 && name[0] == CTL_KERN && name[1] == KERN_EXEC) {
	55	/*
	56	* 7723306: intercept kern.exec and fake a return of
	57	* a dummy string ("/" in this case)
	58	*/
	59	if (newp != NULL) {
	60	errno = EPERM;
	61	return -1;
	62	}
	63	if (oldp == NULL) {
	64	if (oldlenp != NULL) *oldlenp = 2;
	65	return 0;
	66	}
	67	if (oldlenp == NULL) {
	68	errno = EFAULT;
	69	return -1;
	70	}
	71	if (*oldlenp < 2) {
	72	errno = ENOMEM;
	73	return -1;
	74	}
	75	memmove(oldp, "/", 2);
	76	*oldlenp = 2;
	77	return 0;
	78	}
a9aaacca A	79
	80
	81	int error = __sysctl(name, namelen, oldp, oldlenp, newp, newlen);
	82	if (error < 0) {
	83	return error;
	84	}
	85
	86
	87	return error;
ad3c9f2a	88	}
e9ce8d39 A	89
	90	if (newp != NULL) {
	91	errno = EPERM;
	92	return (-1);
	93	}
	94	if (namelen != 2) {
	95	errno = EINVAL;
	96	return (-1);
	97	}
	98
	99	switch (name[1]) {
	100	case USER_CS_PATH:
9385eb3d A	101	if (oldp && *oldlenp < sizeof(_PATH_STDPATH)) {
	102	errno = ENOMEM;
	103	return -1;
	104	}
e9ce8d39 A	105	*oldlenp = sizeof(_PATH_STDPATH);
	106	if (oldp != NULL)
	107	memmove(oldp, _PATH_STDPATH, sizeof(_PATH_STDPATH));
	108	return (0);
	109	}
	110
9385eb3d A	111	if (oldp && *oldlenp < sizeof(int)) {
	112	errno = ENOMEM;
	113	return (-1);
	114	}
e9ce8d39 A	115	*oldlenp = sizeof(int);
	116	if (oldp == NULL)
	117	return (0);
	118
	119	switch (name[1]) {
	120	case USER_BC_BASE_MAX:
	121	(int )oldp = BC_BASE_MAX;
	122	return (0);
	123	case USER_BC_DIM_MAX:
	124	(int )oldp = BC_DIM_MAX;
	125	return (0);
	126	case USER_BC_SCALE_MAX:
	127	(int )oldp = BC_SCALE_MAX;
	128	return (0);
	129	case USER_BC_STRING_MAX:
	130	(int )oldp = BC_STRING_MAX;
	131	return (0);
	132	case USER_COLL_WEIGHTS_MAX:
	133	(int )oldp = COLL_WEIGHTS_MAX;
	134	return (0);
	135	case USER_EXPR_NEST_MAX:
	136	(int )oldp = EXPR_NEST_MAX;
	137	return (0);
	138	case USER_LINE_MAX:
	139	(int )oldp = LINE_MAX;
	140	return (0);
	141	case USER_RE_DUP_MAX:
	142	(int )oldp = RE_DUP_MAX;
	143	return (0);
	144	case USER_POSIX2_VERSION:
	145	(int )oldp = _POSIX2_VERSION;
	146	return (0);
	147	case USER_POSIX2_C_BIND:
	148	#ifdef POSIX2_C_BIND
	149	(int )oldp = 1;
	150	#else
	151	(int )oldp = 0;
	152	#endif
	153	return (0);
	154	case USER_POSIX2_C_DEV:
	155	#ifdef POSIX2_C_DEV
	156	(int )oldp = 1;
	157	#else
	158	(int )oldp = 0;
	159	#endif
	160	return (0);
	161	case USER_POSIX2_CHAR_TERM:
	162	#ifdef POSIX2_CHAR_TERM
	163	(int )oldp = 1;
	164	#else
	165	(int )oldp = 0;
	166	#endif
	167	return (0);
	168	case USER_POSIX2_FORT_DEV:
	169	#ifdef POSIX2_FORT_DEV
	170	(int )oldp = 1;
	171	#else
	172	(int )oldp = 0;
	173	#endif
	174	return (0);
	175	case USER_POSIX2_FORT_RUN:
	176	#ifdef POSIX2_FORT_RUN
	177	(int )oldp = 1;
	178	#else
179	(int )oldp = 0;
180	#endif
181	return (0);
182	case USER_POSIX2_LOCALEDEF:
183	#ifdef POSIX2_LOCALEDEF
184	(int )oldp = 1;
185	#else
186	(int )oldp = 0;
187	#endif
188	return (0);
189	case USER_POSIX2_SW_DEV:
190	#ifdef POSIX2_SW_DEV
191	(int )oldp = 1;
192	#else
193	(int )oldp = 0;
194	#endif
195	return (0);
196	case USER_POSIX2_UPE:
197	#ifdef POSIX2_UPE
198	(int )oldp = 1;
199	#else
200	(int )oldp = 0;
201	#endif
202	return (0);
203	case USER_STREAM_MAX:
204	(int )oldp = FOPEN_MAX;
205	return (0);
206	case USER_TZNAME_MAX:
207	(int )oldp = NAME_MAX;
208	return (0);
209	default:
210	errno = EINVAL;
211	return (-1);
212	}
213	/* NOTREACHED */
214	}