sysctl.c revision 1.18
1 /* $NetBSD: sysctl.c,v 1.18 2004/03/24 16:34:34 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 1.18 2004/03/24 16:34:34 atatat Exp $"); 38 #endif 39 #endif /* LIBC_SCCS and not lint */ 40 41 #include "namespace.h" 42 #include <sys/param.h> 43 #include <sys/sysctl.h> 44 45 #include <errno.h> 46 #include <paths.h> 47 #include <stdio.h> 48 #include <string.h> 49 #include <unistd.h> 50 #include "extern.h" 51 52 #ifdef __weak_alias 53 __weak_alias(sysctl,_sysctl) 54 #endif 55 56 /* 57 * handles requests off the user subtree 58 */ 59 static int user_sysctl(int *, u_int, void *, size_t *, const void *, size_t); 60 61 /* 62 * copies out individual nodes taking target version into account 63 */ 64 static size_t __cvt_node_out(uint, const struct sysctlnode *, void **, 65 size_t *); 66 67 #include <stdlib.h> 68 69 int 70 sysctl(name, namelen, oldp, oldlenp, newp, newlen) 71 int *name; 72 unsigned int namelen; 73 void *oldp; 74 const void *newp; 75 size_t *oldlenp, newlen; 76 { 77 size_t oldlen, savelen; 78 int error; 79 80 if (name[0] != CTL_USER) 81 /* LINTED will fix when sysctl interface gets corrected */ 82 /* XXX when will that be? */ 83 return (__sysctl(name, namelen, oldp, oldlenp, 84 (void *)newp, newlen)); 85 86 oldlen = (oldlenp == NULL) ? 0 : *oldlenp; 87 savelen = oldlen; 88 error = user_sysctl(name + 1, namelen - 1, oldp, &oldlen, newp, newlen); 89 90 if (error != 0) { 91 errno = error; 92 return (-1); 93 } 94 95 if (oldlenp != NULL) { 96 *oldlenp = oldlen; 97 if (oldp != NULL && oldlen > savelen) { 98 errno = ENOMEM; 99 return (-1); 100 } 101 } 102 103 return (0); 104 } 105 106 static int 107 user_sysctl(name, namelen, oldp, oldlenp, newp, newlen) 108 int *name; 109 unsigned int namelen; 110 void *oldp; 111 const void *newp; 112 size_t *oldlenp, newlen; 113 { 114 #define _INT(s, n, v) { \ 115 .sysctl_flags = CTLFLAG_IMMEDIATE|CTLFLAG_PERMANENT| \ 116 CTLTYPE_INT|SYSCTL_VERSION, \ 117 .sysctl_size = sizeof(int), \ 118 .sysctl_name = (s), \ 119 .sysctl_num = (n), \ 120 .sysctl_un = { .scu_idata = (v), }, } 121 122 /* 123 * the nodes under the "user" node 124 */ 125 static const struct sysctlnode sysctl_usermib[] = { 126 #if defined(lint) 127 /* 128 * lint doesn't like my initializers 129 */ 130 0 131 #else /* !lint */ 132 { 133 .sysctl_flags = SYSCTL_VERSION|CTLFLAG_PERMANENT| 134 CTLTYPE_STRING, 135 .sysctl_size = sizeof(_PATH_STDPATH), 136 .sysctl_name = "cs_path", 137 .sysctl_num = USER_CS_PATH, 138 .sysctl_data = _PATH_STDPATH, 139 }, 140 _INT("bc_base_max", USER_BC_BASE_MAX, BC_BASE_MAX), 141 _INT("bc_dim_max", USER_BC_DIM_MAX, BC_DIM_MAX), 142 _INT("bc_scale_max", USER_BC_SCALE_MAX, BC_SCALE_MAX), 143 _INT("bc_string_max", USER_BC_STRING_MAX, BC_STRING_MAX), 144 _INT("coll_weights_max", USER_COLL_WEIGHTS_MAX, 145 COLL_WEIGHTS_MAX), 146 _INT("expr_nest_max", USER_EXPR_NEST_MAX, EXPR_NEST_MAX), 147 _INT("line_max", USER_LINE_MAX, LINE_MAX), 148 _INT("re_dup_max", USER_RE_DUP_MAX, RE_DUP_MAX), 149 _INT("posix2_version", USER_POSIX2_VERSION, _POSIX2_VERSION), 150 #ifdef POSIX2_C_BIND 151 _INT("posix2_c_bind", USER_POSIX2_C_BIND, 1), 152 #else 153 _INT("posix2_c_bind", USER_POSIX2_C_BIND, 0), 154 #endif 155 #ifdef POSIX2_C_DEV 156 _INT("posix2_c_dev", USER_POSIX2_C_DEV, 1), 157 #else 158 _INT("posix2_c_dev", USER_POSIX2_C_DEV, 0), 159 #endif 160 #ifdef POSIX2_CHAR_TERM 161 _INT("posix2_char_term", USER_POSIX2_CHAR_TERM, 1), 162 #else 163 _INT("posix2_char_term", USER_POSIX2_CHAR_TERM, 0), 164 #endif 165 #ifdef POSIX2_FORT_DEV 166 _INT("posix2_fort_dev", USER_POSIX2_FORT_DEV, 1), 167 #else 168 _INT("posix2_fort_dev", USER_POSIX2_FORT_DEV, 0), 169 #endif 170 #ifdef POSIX2_FORT_RUN 171 _INT("posix2_fort_run", USER_POSIX2_FORT_RUN, 1), 172 #else 173 _INT("posix2_fort_run", USER_POSIX2_FORT_RUN, 0), 174 #endif 175 #ifdef POSIX2_LOCALEDEF 176 _INT("posix2_localedef", USER_POSIX2_LOCALEDEF, 1), 177 #else 178 _INT("posix2_localedef", USER_POSIX2_LOCALEDEF, 0), 179 #endif 180 #ifdef POSIX2_SW_DEV 181 _INT("posix2_sw_dev", USER_POSIX2_SW_DEV, 1), 182 #else 183 _INT("posix2_sw_dev", USER_POSIX2_SW_DEV, 0), 184 #endif 185 #ifdef POSIX2_UPE 186 _INT("posix2_upe", USER_POSIX2_UPE, 1), 187 #else 188 _INT("posix2_upe", USER_POSIX2_UPE, 0), 189 #endif 190 _INT("stream_max", USER_STREAM_MAX, FOPEN_MAX), 191 _INT("tzname_max", USER_TZNAME_MAX, NAME_MAX), 192 _INT("atexit_max", USER_ATEXIT_MAX, -1), 193 #endif /* !lint */ 194 }; 195 #undef _INT 196 197 static const int clen = sizeof(sysctl_usermib) / 198 sizeof(sysctl_usermib[0]); 199 200 const struct sysctlnode *node; 201 int ni; 202 size_t l, sz; 203 204 /* 205 * none of these nodes are writable and they're all terminal (for now) 206 */ 207 if (namelen != 1) 208 return (EINVAL); 209 210 l = *oldlenp; 211 if (name[0] == CTL_QUERY) { 212 uint v; 213 node = newp; 214 if (node == NULL) { 215 v = SYSCTL_VERS_0; 216 newlen = sizeof(struct sysctlnode); 217 } 218 else if (SYSCTL_VERS(node->sysctl_flags) == SYSCTL_VERS_0 && 219 newlen == sizeof(struct sysctlnode)) 220 v = SYSCTL_VERS_0; 221 else 222 return (EINVAL); 223 224 sz = 0; 225 for (ni = 0; ni < clen; ni++) 226 sz += __cvt_node_out(v, &sysctl_usermib[ni], &oldp, &l); 227 *oldlenp = sz; 228 return (0); 229 } 230 231 /* 232 * none of these nodes are writable 233 */ 234 if (newp != NULL || newlen != 0) 235 return (EPERM); 236 237 node = &sysctl_usermib[0]; 238 for (ni = 0; ni < clen; ni++) 239 if (name[0] == node[ni].sysctl_num) 240 break; 241 if (ni == clen) 242 return (EOPNOTSUPP); 243 244 node = &node[ni]; 245 if (node->sysctl_flags & CTLFLAG_IMMEDIATE) { 246 switch (SYSCTL_TYPE(node->sysctl_flags)) { 247 case CTLTYPE_INT: 248 newp = &node->sysctl_idata; 249 break; 250 case CTLTYPE_QUAD: 251 newp = &node->sysctl_qdata; 252 break; 253 default: 254 return (EINVAL); 255 } 256 } 257 else 258 newp = node->sysctl_data; 259 260 l = MIN(l, node->sysctl_size); 261 if (oldp != NULL) 262 memcpy(oldp, newp, l); 263 *oldlenp = node->sysctl_size; 264 265 return (0); 266 } 267 268 static size_t 269 __cvt_node_out(uint v, const struct sysctlnode *n, void **o, size_t *l) 270 { 271 const void *src = n; 272 size_t sz; 273 274 switch (v) { 275 case SYSCTL_VERSION: 276 sz = sizeof(struct sysctlnode); 277 break; 278 default: 279 sz = 0; 280 break; 281 } 282 283 if (sz > 0 && *o != NULL && *l >= sz) { 284 memcpy(*o, src, sz); 285 *o = sz + (caddr_t)*o; 286 *l -= sz; 287 } 288 289 return(sz); 290 } 291
Indexes created Thu Sep 25 16:09:42 GMT 2025