sysctl.c revision 1.19
1 /* $NetBSD: sysctl.c,v 1.19 2004/03/24 17:21:02 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 1.19 2004/03/24 17:21:02 atatat Exp $"); 38 #endif 39 #endif /* LIBC_SCCS and not lint */ 40 41 #include "namespace.h" 42 #include <sys/param.h> 43 #define __COMPAT_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 /* 63 * copies out individual nodes taking target version into account 64 */ 65 static size_t __cvt_node_out(uint, const struct sysctlnode *, void **, 66 size_t *); 67 68 #include <stdlib.h> 69 70 int 71 sysctl(name, namelen, oldp, oldlenp, newp, newlen) 72 int *name; 73 unsigned int namelen; 74 void *oldp; 75 const void *newp; 76 size_t *oldlenp, newlen; 77 { 78 size_t oldlen, savelen; 79 int error; 80 81 if (name[0] != CTL_USER) 82 /* LINTED will fix when sysctl interface gets corrected */ 83 /* XXX when will that be? */ 84 return (__sysctl(name, namelen, oldp, oldlenp, 85 (void *)newp, newlen)); 86 87 oldlen = (oldlenp == NULL) ? 0 : *oldlenp; 88 savelen = oldlen; 89 error = user_sysctl(name + 1, namelen - 1, oldp, &oldlen, newp, newlen); 90 91 if (error != 0) { 92 errno = error; 93 return (-1); 94 } 95 96 if (oldlenp != NULL) { 97 *oldlenp = oldlen; 98 if (oldp != NULL && oldlen > savelen) { 99 errno = ENOMEM; 100 return (-1); 101 } 102 } 103 104 return (0); 105 } 106 107 static int 108 user_sysctl(name, namelen, oldp, oldlenp, newp, newlen) 109 int *name; 110 unsigned int namelen; 111 void *oldp; 112 const void *newp; 113 size_t *oldlenp, newlen; 114 { 115 #define _INT(s, n, v) { \ 116 .sysctl_flags = CTLFLAG_IMMEDIATE|CTLFLAG_PERMANENT| \ 117 CTLTYPE_INT|SYSCTL_VERSION, \ 118 .sysctl_size = sizeof(int), \ 119 .sysctl_name = (s), \ 120 .sysctl_num = (n), \ 121 .sysctl_un = { .scu_idata = (v), }, } 122 123 /* 124 * the nodes under the "user" node 125 */ 126 static const struct sysctlnode sysctl_usermib[] = { 127 #if defined(lint) 128 /* 129 * lint doesn't like my initializers 130 */ 131 0 132 #else /* !lint */ 133 { 134 .sysctl_flags = SYSCTL_VERSION|CTLFLAG_PERMANENT| 135 CTLTYPE_STRING, 136 .sysctl_size = sizeof(_PATH_STDPATH), 137 .sysctl_name = "cs_path", 138 .sysctl_num = USER_CS_PATH, 139 .sysctl_data = _PATH_STDPATH, 140 }, 141 _INT("bc_base_max", USER_BC_BASE_MAX, BC_BASE_MAX), 142 _INT("bc_dim_max", USER_BC_DIM_MAX, BC_DIM_MAX), 143 _INT("bc_scale_max", USER_BC_SCALE_MAX, BC_SCALE_MAX), 144 _INT("bc_string_max", USER_BC_STRING_MAX, BC_STRING_MAX), 145 _INT("coll_weights_max", USER_COLL_WEIGHTS_MAX, 146 COLL_WEIGHTS_MAX), 147 _INT("expr_nest_max", USER_EXPR_NEST_MAX, EXPR_NEST_MAX), 148 _INT("line_max", USER_LINE_MAX, LINE_MAX), 149 _INT("re_dup_max", USER_RE_DUP_MAX, RE_DUP_MAX), 150 _INT("posix2_version", USER_POSIX2_VERSION, _POSIX2_VERSION), 151 #ifdef POSIX2_C_BIND 152 _INT("posix2_c_bind", USER_POSIX2_C_BIND, 1), 153 #else 154 _INT("posix2_c_bind", USER_POSIX2_C_BIND, 0), 155 #endif 156 #ifdef POSIX2_C_DEV 157 _INT("posix2_c_dev", USER_POSIX2_C_DEV, 1), 158 #else 159 _INT("posix2_c_dev", USER_POSIX2_C_DEV, 0), 160 #endif 161 #ifdef POSIX2_CHAR_TERM 162 _INT("posix2_char_term", USER_POSIX2_CHAR_TERM, 1), 163 #else 164 _INT("posix2_char_term", USER_POSIX2_CHAR_TERM, 0), 165 #endif 166 #ifdef POSIX2_FORT_DEV 167 _INT("posix2_fort_dev", USER_POSIX2_FORT_DEV, 1), 168 #else 169 _INT("posix2_fort_dev", USER_POSIX2_FORT_DEV, 0), 170 #endif 171 #ifdef POSIX2_FORT_RUN 172 _INT("posix2_fort_run", USER_POSIX2_FORT_RUN, 1), 173 #else 174 _INT("posix2_fort_run", USER_POSIX2_FORT_RUN, 0), 175 #endif 176 #ifdef POSIX2_LOCALEDEF 177 _INT("posix2_localedef", USER_POSIX2_LOCALEDEF, 1), 178 #else 179 _INT("posix2_localedef", USER_POSIX2_LOCALEDEF, 0), 180 #endif 181 #ifdef POSIX2_SW_DEV 182 _INT("posix2_sw_dev", USER_POSIX2_SW_DEV, 1), 183 #else 184 _INT("posix2_sw_dev", USER_POSIX2_SW_DEV, 0), 185 #endif 186 #ifdef POSIX2_UPE 187 _INT("posix2_upe", USER_POSIX2_UPE, 1), 188 #else 189 _INT("posix2_upe", USER_POSIX2_UPE, 0), 190 #endif 191 _INT("stream_max", USER_STREAM_MAX, FOPEN_MAX), 192 _INT("tzname_max", USER_TZNAME_MAX, NAME_MAX), 193 _INT("atexit_max", USER_ATEXIT_MAX, -1), 194 #endif /* !lint */ 195 }; 196 #undef _INT 197 198 static const int clen = sizeof(sysctl_usermib) / 199 sizeof(sysctl_usermib[0]); 200 201 const struct sysctlnode *node; 202 int ni; 203 size_t l, sz; 204 205 /* 206 * none of these nodes are writable and they're all terminal (for now) 207 */ 208 if (namelen != 1) 209 return (EINVAL); 210 211 l = *oldlenp; 212 if (name[0] == CTL_QUERY) { 213 uint v; 214 node = newp; 215 if (node == NULL) { 216 v = SYSCTL_VERS_0; 217 newlen = sizeof(struct sysctlnode); 218 } 219 else if (SYSCTL_VERS(node->sysctl_flags) == SYSCTL_VERS_0 && 220 newlen == sizeof(struct sysctlnode0)) 221 v = SYSCTL_VERS_0; 222 else if (SYSCTL_VERS(node->sysctl_flags) == SYSCTL_VERS_1 && 223 newlen == sizeof(struct sysctlnode)) 224 v = SYSCTL_VERS_1; 225 else 226 return (EINVAL); 227 228 sz = 0; 229 for (ni = 0; ni < clen; ni++) 230 sz += __cvt_node_out(v, &sysctl_usermib[ni], &oldp, &l); 231 *oldlenp = sz; 232 return (0); 233 } 234 235 /* 236 * none of these nodes are writable 237 */ 238 if (newp != NULL || newlen != 0) 239 return (EPERM); 240 241 node = &sysctl_usermib[0]; 242 for (ni = 0; ni < clen; ni++) 243 if (name[0] == node[ni].sysctl_num) 244 break; 245 if (ni == clen) 246 return (EOPNOTSUPP); 247 248 node = &node[ni]; 249 if (node->sysctl_flags & CTLFLAG_IMMEDIATE) { 250 switch (SYSCTL_TYPE(node->sysctl_flags)) { 251 case CTLTYPE_INT: 252 newp = &node->sysctl_idata; 253 break; 254 case CTLTYPE_QUAD: 255 newp = &node->sysctl_qdata; 256 break; 257 default: 258 return (EINVAL); 259 } 260 } 261 else 262 newp = node->sysctl_data; 263 264 l = MIN(l, node->sysctl_size); 265 if (oldp != NULL) 266 memcpy(oldp, newp, l); 267 *oldlenp = node->sysctl_size; 268 269 return (0); 270 } 271 272 static size_t 273 __cvt_node_out(uint v, const struct sysctlnode *n, void **o, size_t *l) 274 { 275 struct sysctlnode0 node0; 276 const void *src = n; 277 size_t sz; 278 279 switch (v) { 280 case SYSCTL_VERS_0: 281 memset(&node0, 0, sizeof(node0)); 282 node0.sysctl0_flags = n->sysctl_flags; 283 node0.sysctl0_num = n->sysctl_num; 284 node0.sysctl0_size = n->sysctl_size; 285 memcpy(node0.sysctl0_name, n->sysctl_name, SYSCTL_NAMELEN); 286 node0.sysctl0_csize = n->sysctl_csize; 287 node0.sysctl0_clen = n->sysctl_clen; 288 node0.sysctl0_child = NULL; 289 node0.sysctl0_alias = n->sysctl_alias; 290 node0.sysctl0_idata = n->sysctl_idata; 291 node0.sysctl0_qdata = n->sysctl_qdata; 292 node0.sysctl0_data = n->sysctl_data; 293 node0.sysctl0_func = NULL; 294 node0.sysctl0_parent = NULL; 295 node0.sysctl0_ver = n->sysctl_ver; 296 node0.sysctl0_flags &= ~SYSCTL_VERS_MASK; 297 node0.sysctl0_flags |= SYSCTL_VERS_0; 298 src = &node0; 299 sz = sizeof(node0); 300 break; 301 302 #if (SYSCTL_VERSION != SYSCTL_VERS_1) 303 #error __cvt_node_out: no support for SYSCTL_VERSION 304 #endif /* (SYSCTL_VERSION != SYSCTL_VERS_1) */ 305 306 case SYSCTL_VERSION: 307 sz = sizeof(struct sysctlnode); 308 break; 309 default: 310 sz = 0; 311 break; 312 } 313 314 if (sz > 0 && *o != NULL && *l >= sz) { 315 memcpy(*o, src, sz); 316 *o = sz + (caddr_t)*o; 317 *l -= sz; 318 } 319 320 return(sz); 321 } 322
Indexes created Thu Sep 25 16:09:42 GMT 2025