1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __SCCSID("@(#)sysctl.c 8.2 (Berkeley) 1/4/94"); 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 46 extern int __sysctl(const int *name, u_int namelen, void *oldp, 47 size_t *oldlenp, const void *newp, size_t newlen); 48 49 int 50 sysctl(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 (namelen != 2) { 72 errno = EINVAL; 73 return (-1); 74 } 75 if (newp != NULL && name[1] != USER_LOCALBASE) { 76 errno = EPERM; 77 return (-1); 78 } 79 80 switch (name[1]) { 81 case USER_CS_PATH: 82 if (oldp != NULL && 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 case USER_LOCALBASE: 91 if (oldlenp != NULL) { 92 if (oldp == NULL) { 93 if (*oldlenp == 1) 94 *oldlenp = sizeof(_PATH_LOCALBASE); 95 } else { 96 if (*oldlenp != 1) 97 return (retval); 98 if (orig_oldlen < sizeof(_PATH_LOCALBASE)) { 99 errno = ENOMEM; 100 return (-1); 101 } 102 *oldlenp = sizeof(_PATH_LOCALBASE); 103 memmove(oldp, _PATH_LOCALBASE, sizeof(_PATH_LOCALBASE)); 104 } 105 } 106 return (0); 107 } 108 109 if (oldp && *oldlenp < sizeof(int)) { 110 errno = ENOMEM; 111 return (-1); 112 } 113 *oldlenp = sizeof(int); 114 if (oldp == NULL) 115 return (0); 116 117 switch (name[1]) { 118 case USER_BC_BASE_MAX: 119 *(int *)oldp = BC_BASE_MAX; 120 return (0); 121 case USER_BC_DIM_MAX: 122 *(int *)oldp = BC_DIM_MAX; 123 return (0); 124 case USER_BC_SCALE_MAX: 125 *(int *)oldp = BC_SCALE_MAX; 126 return (0); 127 case USER_BC_STRING_MAX: 128 *(int *)oldp = BC_STRING_MAX; 129 return (0); 130 case USER_COLL_WEIGHTS_MAX: 131 *(int *)oldp = COLL_WEIGHTS_MAX; 132 return (0); 133 case USER_EXPR_NEST_MAX: 134 *(int *)oldp = EXPR_NEST_MAX; 135 return (0); 136 case USER_LINE_MAX: 137 *(int *)oldp = LINE_MAX; 138 return (0); 139 case USER_RE_DUP_MAX: 140 *(int *)oldp = RE_DUP_MAX; 141 return (0); 142 case USER_POSIX2_VERSION: 143 *(int *)oldp = _POSIX2_VERSION; 144 return (0); 145 case USER_POSIX2_C_BIND: 146 #ifdef POSIX2_C_BIND 147 *(int *)oldp = 1; 148 #else 149 *(int *)oldp = 0; 150 #endif 151 return (0); 152 case USER_POSIX2_C_DEV: 153 #ifdef POSIX2_C_DEV 154 *(int *)oldp = 1; 155 #else 156 *(int *)oldp = 0; 157 #endif 158 return (0); 159 case USER_POSIX2_CHAR_TERM: 160 #ifdef POSIX2_CHAR_TERM 161 *(int *)oldp = 1; 162 #else 163 *(int *)oldp = 0; 164 #endif 165 return (0); 166 case USER_POSIX2_FORT_DEV: 167 #ifdef POSIX2_FORT_DEV 168 *(int *)oldp = 1; 169 #else 170 *(int *)oldp = 0; 171 #endif 172 return (0); 173 case USER_POSIX2_FORT_RUN: 174 #ifdef POSIX2_FORT_RUN 175 *(int *)oldp = 1; 176 #else 177 *(int *)oldp = 0; 178 #endif 179 return (0); 180 case USER_POSIX2_LOCALEDEF: 181 #ifdef POSIX2_LOCALEDEF 182 *(int *)oldp = 1; 183 #else 184 *(int *)oldp = 0; 185 #endif 186 return (0); 187 case USER_POSIX2_SW_DEV: 188 #ifdef POSIX2_SW_DEV 189 *(int *)oldp = 1; 190 #else 191 *(int *)oldp = 0; 192 #endif 193 return (0); 194 case USER_POSIX2_UPE: 195 #ifdef POSIX2_UPE 196 *(int *)oldp = 1; 197 #else 198 *(int *)oldp = 0; 199 #endif 200 return (0); 201 case USER_STREAM_MAX: 202 *(int *)oldp = FOPEN_MAX; 203 return (0); 204 case USER_TZNAME_MAX: 205 *(int *)oldp = NAME_MAX; 206 return (0); 207 default: 208 errno = EINVAL; 209 return (-1); 210 } 211 /* NOTREACHED */ 212 } 213