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 != NULL ? *oldlenp : 0; 57 retval = __sysctl(name, namelen, oldp, oldlenp, newp, newlen); 58 /* 59 * Valid names under CTL_USER except USER_LOCALBASE have a dummy entry 60 * in the sysctl tree (to support name lookups and enumerations) with 61 * an empty/zero value, and the true value is supplied by this routine. 62 * For all such names, __sysctl() is used solely to validate the name. 63 * 64 * Return here unless there was a successful lookup for a CTL_USER name. 65 */ 66 if (retval != 0 || name[0] != CTL_USER) 67 return (retval); 68 69 if (namelen != 2) { 70 errno = EINVAL; 71 return (-1); 72 } 73 74 /* Variables under CLT_USER that may be overridden by kernel values */ 75 switch (name[1]) { 76 case USER_LOCALBASE: 77 if (oldlenp == NULL || *oldlenp != 1) 78 return (0); 79 if (oldp != NULL) { 80 if (orig_oldlen < sizeof(_PATH_LOCALBASE)) { 81 errno = ENOMEM; 82 return (-1); 83 } 84 memmove(oldp, _PATH_LOCALBASE, sizeof(_PATH_LOCALBASE)); 85 } 86 *oldlenp = sizeof(_PATH_LOCALBASE); 87 return (0); 88 } 89 90 /* Variables under CLT_USER whose values are immutably defined below */ 91 if (newp != NULL) { 92 errno = EPERM; 93 return (-1); 94 } 95 96 switch (name[1]) { 97 case USER_CS_PATH: 98 if (oldp != NULL && orig_oldlen < sizeof(_PATH_STDPATH)) { 99 errno = ENOMEM; 100 return (-1); 101 } 102 *oldlenp = sizeof(_PATH_STDPATH); 103 if (oldp != NULL) 104 memmove(oldp, _PATH_STDPATH, sizeof(_PATH_STDPATH)); 105 return (0); 106 } 107 108 if (oldp != NULL && *oldlenp < sizeof(int)) { 109 errno = ENOMEM; 110 return (-1); 111 } 112 *oldlenp = sizeof(int); 113 if (oldp == NULL) 114 return (0); 115 116 switch (name[1]) { 117 case USER_BC_BASE_MAX: 118 *(int *)oldp = BC_BASE_MAX; 119 return (0); 120 case USER_BC_DIM_MAX: 121 *(int *)oldp = BC_DIM_MAX; 122 return (0); 123 case USER_BC_SCALE_MAX: 124 *(int *)oldp = BC_SCALE_MAX; 125 return (0); 126 case USER_BC_STRING_MAX: 127 *(int *)oldp = BC_STRING_MAX; 128 return (0); 129 case USER_COLL_WEIGHTS_MAX: 130 *(int *)oldp = COLL_WEIGHTS_MAX; 131 return (0); 132 case USER_EXPR_NEST_MAX: 133 *(int *)oldp = EXPR_NEST_MAX; 134 return (0); 135 case USER_LINE_MAX: 136 *(int *)oldp = LINE_MAX; 137 return (0); 138 case USER_RE_DUP_MAX: 139 *(int *)oldp = RE_DUP_MAX; 140 return (0); 141 case USER_POSIX2_VERSION: 142 *(int *)oldp = _POSIX2_VERSION; 143 return (0); 144 case USER_POSIX2_C_BIND: 145 #ifdef POSIX2_C_BIND 146 *(int *)oldp = 1; 147 #else 148 *(int *)oldp = 0; 149 #endif 150 return (0); 151 case USER_POSIX2_C_DEV: 152 #ifdef POSIX2_C_DEV 153 *(int *)oldp = 1; 154 #else 155 *(int *)oldp = 0; 156 #endif 157 return (0); 158 case USER_POSIX2_CHAR_TERM: 159 #ifdef POSIX2_CHAR_TERM 160 *(int *)oldp = 1; 161 #else 162 *(int *)oldp = 0; 163 #endif 164 return (0); 165 case USER_POSIX2_FORT_DEV: 166 #ifdef POSIX2_FORT_DEV 167 *(int *)oldp = 1; 168 #else 169 *(int *)oldp = 0; 170 #endif 171 return (0); 172 case USER_POSIX2_FORT_RUN: 173 #ifdef POSIX2_FORT_RUN 174 *(int *)oldp = 1; 175 #else 176 *(int *)oldp = 0; 177 #endif 178 return (0); 179 case USER_POSIX2_LOCALEDEF: 180 #ifdef POSIX2_LOCALEDEF 181 *(int *)oldp = 1; 182 #else 183 *(int *)oldp = 0; 184 #endif 185 return (0); 186 case USER_POSIX2_SW_DEV: 187 #ifdef POSIX2_SW_DEV 188 *(int *)oldp = 1; 189 #else 190 *(int *)oldp = 0; 191 #endif 192 return (0); 193 case USER_POSIX2_UPE: 194 #ifdef POSIX2_UPE 195 *(int *)oldp = 1; 196 #else 197 *(int *)oldp = 0; 198 #endif 199 return (0); 200 case USER_STREAM_MAX: 201 *(int *)oldp = FOPEN_MAX; 202 return (0); 203 case USER_TZNAME_MAX: 204 *(int *)oldp = NAME_MAX; 205 return (0); 206 default: 207 errno = EINVAL; 208 return (-1); 209 } 210 /* NOTREACHED */ 211 } 212