sysctl.c revision 1.14
1 /* $NetBSD: sysctl.c,v 1.14 2003/12/04 19:40:55 atatat Exp $ */ 2 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 #if defined(LIBC_SCCS) && !defined(lint) 34 #if 0 35 static char sccsid[] = "@(#)sysctl.c 8.2 (Berkeley) 1/4/94"; 36 #else 37 __RCSID("$NetBSD: sysctl.c,v 1.14 2003/12/04 19:40:55 atatat Exp $"); 38 #endif 39 #endif /* LIBC_SCCS and not lint */ 40 41 #include "namespace.h" 42 #include <sys/param.h> 43 #define __USE_NEW_SYSCTL 44 #include <sys/sysctl.h> 45 46 #include <errno.h> 47 #include <paths.h> 48 #include <stdio.h> 49 #include <string.h> 50 #include <unistd.h> 51 #include "extern.h" 52 53 #ifdef __weak_alias 54 __weak_alias(sysctl,_sysctl) 55 #endif 56 57 /* 58 * handles requests off the user subtree 59 */ 60 static int user_sysctl(int *, u_int, void *, size_t *, const void *, size_t); 61 62 #include <stdlib.h> 63 64 int 65 sysctl(name, namelen, oldp, oldlenp, newp, newlen) 66 int *name; 67 unsigned int namelen; 68 void *oldp; 69 const void *newp; 70 size_t *oldlenp, newlen; 71 { 72 size_t oldlen, savelen; 73 int error; 74 75 if (name[0] != CTL_USER) 76 /* LINTED will fix when sysctl interface gets corrected */ 77 /* XXX when will that be? */ 78 return (__sysctl(name, namelen, oldp, oldlenp, 79 (void *)newp, newlen)); 80 81 oldlen = (oldlenp == NULL) ? 0 : *oldlenp; 82 savelen = oldlen; 83 error = user_sysctl(name + 1, namelen - 1, oldp, &oldlen, newp, newlen); 84 85 if (error != 0) { 86 errno = error; 87 return (-1); 88 } 89 90 if (oldlenp != NULL) { 91 *oldlenp = oldlen; 92 if (oldp != NULL && oldlen > savelen) { 93 errno = ENOMEM; 94 return (-1); 95 } 96 } 97 98 return (0); 99 } 100 101 static int 102 user_sysctl(name, namelen, oldp, oldlenp, newp, newlen) 103 int *name; 104 unsigned int namelen; 105 void *oldp; 106 const void *newp; 107 size_t *oldlenp, newlen; 108 { 109 #define _INT(s, n, v) { \ 110 .sysctl_flags = SYSCTL_IMMEDIATE|SYSCTL_PERMANENT|SYSCTL_READONLY| \ 111 SYSCTL_TYPE(CTLTYPE_INT), \ 112 .sysctl_size = sizeof(int), \ 113 .sysctl_name = (s), \ 114 .sysctl_num = (n), \ 115 .sysctl_un = { .scu_idata = (v), }, } 116 117 /* 118 * the nodes under the "user" node 119 */ 120 static const struct sysctlnode sysctl_usermib[] = { 121 #if defined(lint) 122 /* 123 * lint doesn't like my initializers 124 */ 125 0 126 #else /* !lint */ 127 { 128 .sysctl_flags = SYSCTL_READONLY|SYSCTL_PERMANENT| 129 SYSCTL_TYPE(CTLTYPE_STRING), 130 .sysctl_size = sizeof(_PATH_STDPATH), 131 .sysctl_name = "cs_path", 132 .sysctl_num = USER_CS_PATH, 133 .sysctl_un = { .scu_data = _PATH_STDPATH, }, 134 }, 135 _INT("bc_base_max", USER_BC_BASE_MAX, BC_BASE_MAX), 136 _INT("bc_dim_max", USER_BC_DIM_MAX, BC_DIM_MAX), 137 _INT("bc_scale_max", USER_BC_SCALE_MAX, BC_SCALE_MAX), 138 _INT("bc_string_max", USER_BC_STRING_MAX, BC_STRING_MAX), 139 _INT("coll_weights_max", USER_COLL_WEIGHTS_MAX, 140 COLL_WEIGHTS_MAX), 141 _INT("expr_nest_max", USER_EXPR_NEST_MAX, EXPR_NEST_MAX), 142 _INT("line_max", USER_LINE_MAX, LINE_MAX), 143 _INT("re_dup_max", USER_RE_DUP_MAX, RE_DUP_MAX), 144 _INT("posix2_version", USER_POSIX2_VERSION, _POSIX2_VERSION), 145 #ifdef POSIX2_C_BIND 146 _INT("posix2_c_bind", USER_POSIX2_C_BIND, 1), 147 #else 148 _INT("posix2_c_bind", USER_POSIX2_C_BIND, 0), 149 #endif 150 #ifdef POSIX2_C_DEV 151 _INT("posix2_c_dev", USER_POSIX2_C_DEV, 1), 152 #else 153 _INT("posix2_c_dev", USER_POSIX2_C_DEV, 0), 154 #endif 155 #ifdef POSIX2_CHAR_TERM 156 _INT("posix2_char_term", USER_POSIX2_CHAR_TERM, 1), 157 #else 158 _INT("posix2_char_term", USER_POSIX2_CHAR_TERM, 0), 159 #endif 160 #ifdef POSIX2_FORT_DEV 161 _INT("posix2_fort_dev", USER_POSIX2_FORT_DEV, 1), 162 #else 163 _INT("posix2_fort_dev", USER_POSIX2_FORT_DEV, 0), 164 #endif 165 #ifdef POSIX2_FORT_RUN 166 _INT("posix2_fort_run", USER_POSIX2_FORT_RUN, 1), 167 #else 168 _INT("posix2_fort_run", USER_POSIX2_FORT_RUN, 0), 169 #endif 170 #ifdef POSIX2_LOCALEDEF 171 _INT("posix2_localedef", USER_POSIX2_LOCALEDEF, 1), 172 #else 173 _INT("posix2_localedef", USER_POSIX2_LOCALEDEF, 0), 174 #endif 175 #ifdef POSIX2_SW_DEV 176 _INT("posix2_sw_dev", USER_POSIX2_SW_DEV, 1), 177 #else 178 _INT("posix2_sw_dev", USER_POSIX2_SW_DEV, 0), 179 #endif 180 #ifdef POSIX2_UPE 181 _INT("posix2_upe", USER_POSIX2_UPE, 1), 182 #else 183 _INT("posix2_upe", USER_POSIX2_UPE, 0), 184 #endif 185 _INT("stream_max", USER_STREAM_MAX, FOPEN_MAX), 186 _INT("tzname_max", USER_TZNAME_MAX, NAME_MAX), 187 _INT("atexit_max", USER_ATEXIT_MAX, -1), 188 #endif /* !lint */ 189 }; 190 #undef _INT 191 192 static const int clen = sizeof(sysctl_usermib) / 193 sizeof(sysctl_usermib[0]); 194 195 const struct sysctlnode *node; 196 int ni; 197 size_t l, sz; 198 199 /* 200 * none of these nodes are writable and they're all terminal (for now) 201 */ 202 if (newp != NULL || newlen != 0) 203 return (EPERM); 204 if (namelen != 1) 205 return (EINVAL); 206 207 l = *oldlenp; 208 if (name[0] == CTL_QUERY) { 209 sz = clen * sizeof(struct sysctlnode); 210 l = MIN(l, sz); 211 if (oldp != NULL) 212 memcpy(oldp, &sysctl_usermib[0], l); 213 *oldlenp = sz; 214 return (0); 215 } 216 217 node = &sysctl_usermib[0]; 218 for (ni = 0; ni < clen; ni++) 219 if (name[0] == node[ni].sysctl_num) 220 break; 221 if (ni == clen) 222 return (EOPNOTSUPP); 223 224 node = &node[ni]; 225 if (node->sysctl_flags & SYSCTL_IMMEDIATE) { 226 switch (SYSCTL_TYPE(node->sysctl_flags)) { 227 case CTLTYPE_INT: 228 newp = &node->sysctl_idata; 229 break; 230 case CTLTYPE_QUAD: 231 newp = &node->sysctl_qdata; 232 break; 233 default: 234 return (EINVAL); 235 } 236 } 237 else 238 newp = node->sysctl_data; 239 240 l = MIN(l, node->sysctl_size); 241 if (oldp != NULL) 242 memcpy(oldp, newp, l); 243 *oldlenp = node->sysctl_size; 244 245 return (0); 246 } 247
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