sysctl.c revision 1.20
1 /* $NetBSD: sysctl.c,v 1.20 2004/03/24 19:31:46 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 1.20 2004/03/24 19:31:46 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, d) { \ 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_idata = (v), \ 122 .sysctl_desc = (d), } 123 124 /* 125 * the nodes under the "user" node 126 */ 127 static const struct sysctlnode sysctl_usermib[] = { 128 #if defined(lint) 129 /* 130 * lint doesn't like my initializers 131 */ 132 0 133 #else /* !lint */ 134 { 135 .sysctl_flags = SYSCTL_VERSION|CTLFLAG_PERMANENT| 136 CTLTYPE_STRING, 137 .sysctl_size = sizeof(_PATH_STDPATH), 138 .sysctl_name = "cs_path", 139 .sysctl_num = USER_CS_PATH, 140 .sysctl_data = _PATH_STDPATH, 141 .sysctl_desc = NULL, 142 }, 143 _INT("bc_base_max", USER_BC_BASE_MAX, BC_BASE_MAX, NULL), 144 _INT("bc_dim_max", USER_BC_DIM_MAX, BC_DIM_MAX, NULL), 145 _INT("bc_scale_max", USER_BC_SCALE_MAX, BC_SCALE_MAX, NULL), 146 _INT("bc_string_max", USER_BC_STRING_MAX, BC_STRING_MAX, NULL), 147 _INT("coll_weights_max", USER_COLL_WEIGHTS_MAX, 148 COLL_WEIGHTS_MAX, NULL), 149 _INT("expr_nest_max", USER_EXPR_NEST_MAX, EXPR_NEST_MAX, NULL), 150 _INT("line_max", USER_LINE_MAX, LINE_MAX, NULL), 151 _INT("re_dup_max", USER_RE_DUP_MAX, RE_DUP_MAX, NULL), 152 _INT("posix2_version", USER_POSIX2_VERSION, _POSIX2_VERSION, NULL), 153 #ifdef POSIX2_C_BIND 154 _INT("posix2_c_bind", USER_POSIX2_C_BIND, 1, NULL), 155 #else 156 _INT("posix2_c_bind", USER_POSIX2_C_BIND, 0, NULL), 157 #endif 158 #ifdef POSIX2_C_DEV 159 _INT("posix2_c_dev", USER_POSIX2_C_DEV, 1, NULL), 160 #else 161 _INT("posix2_c_dev", USER_POSIX2_C_DEV, 0, NULL), 162 #endif 163 #ifdef POSIX2_CHAR_TERM 164 _INT("posix2_char_term", USER_POSIX2_CHAR_TERM, 1, NULL), 165 #else 166 _INT("posix2_char_term", USER_POSIX2_CHAR_TERM, 0, NULL), 167 #endif 168 #ifdef POSIX2_FORT_DEV 169 _INT("posix2_fort_dev", USER_POSIX2_FORT_DEV, 1, NULL), 170 #else 171 _INT("posix2_fort_dev", USER_POSIX2_FORT_DEV, 0, NULL), 172 #endif 173 #ifdef POSIX2_FORT_RUN 174 _INT("posix2_fort_run", USER_POSIX2_FORT_RUN, 1, NULL), 175 #else 176 _INT("posix2_fort_run", USER_POSIX2_FORT_RUN, 0, NULL), 177 #endif 178 #ifdef POSIX2_LOCALEDEF 179 _INT("posix2_localedef", USER_POSIX2_LOCALEDEF, 1, NULL), 180 #else 181 _INT("posix2_localedef", USER_POSIX2_LOCALEDEF, 0, NULL), 182 #endif 183 #ifdef POSIX2_SW_DEV 184 _INT("posix2_sw_dev", USER_POSIX2_SW_DEV, 1, NULL), 185 #else 186 _INT("posix2_sw_dev", USER_POSIX2_SW_DEV, 0, NULL), 187 #endif 188 #ifdef POSIX2_UPE 189 _INT("posix2_upe", USER_POSIX2_UPE, 1, NULL), 190 #else 191 _INT("posix2_upe", USER_POSIX2_UPE, 0, NULL), 192 #endif 193 _INT("stream_max", USER_STREAM_MAX, FOPEN_MAX, NULL), 194 _INT("tzname_max", USER_TZNAME_MAX, NAME_MAX, NULL), 195 _INT("atexit_max", USER_ATEXIT_MAX, -1, NULL), 196 #endif /* !lint */ 197 }; 198 #undef _INT 199 200 static const int clen = sizeof(sysctl_usermib) / 201 sizeof(sysctl_usermib[0]); 202 203 const struct sysctlnode *node; 204 int ni; 205 size_t l, sz; 206 207 /* 208 * none of these nodes are writable and they're all terminal (for now) 209 */ 210 if (namelen != 1) 211 return (EINVAL); 212 213 l = *oldlenp; 214 if (name[0] == CTL_QUERY) { 215 uint v; 216 node = newp; 217 if (node == NULL) { 218 v = SYSCTL_VERS_0; 219 newlen = sizeof(struct sysctlnode); 220 } 221 else if (SYSCTL_VERS(node->sysctl_flags) == SYSCTL_VERS_0 && 222 newlen == sizeof(struct sysctlnode0)) 223 v = SYSCTL_VERS_0; 224 else if (SYSCTL_VERS(node->sysctl_flags) == SYSCTL_VERS_1 && 225 newlen == sizeof(struct sysctlnode)) 226 v = SYSCTL_VERS_1; 227 else 228 return (EINVAL); 229 230 sz = 0; 231 for (ni = 0; ni < clen; ni++) 232 sz += __cvt_node_out(v, &sysctl_usermib[ni], &oldp, &l); 233 *oldlenp = sz; 234 return (0); 235 } 236 237 if (name[0] == CTL_DESCRIBE) { 238 char buf[128]; 239 struct sysctldesc *d1 = (void *)&buf[0], *d2 = oldp; 240 size_t d; 241 242 node = newp; 243 if (node != NULL && 244 (SYSCTL_VERS(node->sysctl_flags) < SYSCTL_VERS_1 || 245 newlen != sizeof(struct sysctlnode))) 246 return (EINVAL); 247 248 sz = 0; 249 for (ni = 0; ni < clen; ni++) { 250 memset(&buf[0], 0, sizeof(buf)); 251 if (node != NULL && 252 node->sysctl_num != sysctl_usermib[ni].sysctl_num) 253 continue; 254 d1->descr_num = sysctl_usermib[ni].sysctl_num; 255 d1->descr_ver = sysctl_usermib[ni].sysctl_ver; 256 if (sysctl_usermib[ni].sysctl_desc == NULL) 257 d1->descr_len = 1; 258 else { 259 strncpy(d1->descr_str, 260 sysctl_usermib[ni].sysctl_desc, 261 sizeof(buf) - sizeof(*d1)); 262 buf[sizeof(buf) - 1] = '\0'; 263 d1->descr_len = strlen(d1->descr_str) + 1; 264 } 265 d = (size_t)__sysc_desc_adv(NULL, d1->descr_len); 266 if (d2 != NULL) 267 memcpy(d2, d1, d); 268 sz += d; 269 if (node != NULL) 270 break; 271 } 272 *oldlenp = sz; 273 if (sz == 0 && node != NULL) 274 return (ENOENT); 275 return (0); 276 277 } 278 279 /* 280 * none of these nodes are writable 281 */ 282 if (newp != NULL || newlen != 0) 283 return (EPERM); 284 285 node = &sysctl_usermib[0]; 286 for (ni = 0; ni < clen; ni++) 287 if (name[0] == node[ni].sysctl_num) 288 break; 289 if (ni == clen) 290 return (EOPNOTSUPP); 291 292 node = &node[ni]; 293 if (node->sysctl_flags & CTLFLAG_IMMEDIATE) { 294 switch (SYSCTL_TYPE(node->sysctl_flags)) { 295 case CTLTYPE_INT: 296 newp = &node->sysctl_idata; 297 break; 298 case CTLTYPE_QUAD: 299 newp = &node->sysctl_qdata; 300 break; 301 default: 302 return (EINVAL); 303 } 304 } 305 else 306 newp = node->sysctl_data; 307 308 l = MIN(l, node->sysctl_size); 309 if (oldp != NULL) 310 memcpy(oldp, newp, l); 311 *oldlenp = node->sysctl_size; 312 313 return (0); 314 } 315 316 static size_t 317 __cvt_node_out(uint v, const struct sysctlnode *n, void **o, size_t *l) 318 { 319 struct sysctlnode0 node0; 320 const void *src = n; 321 size_t sz; 322 323 switch (v) { 324 case SYSCTL_VERS_0: 325 memset(&node0, 0, sizeof(node0)); 326 node0.sysctl0_flags = n->sysctl_flags; 327 node0.sysctl0_num = n->sysctl_num; 328 node0.sysctl0_size = n->sysctl_size; 329 memcpy(node0.sysctl0_name, n->sysctl_name, SYSCTL_NAMELEN); 330 node0.sysctl0_csize = n->sysctl_csize; 331 node0.sysctl0_clen = n->sysctl_clen; 332 node0.sysctl0_child = NULL; 333 node0.sysctl0_alias = n->sysctl_alias; 334 node0.sysctl0_idata = n->sysctl_idata; 335 node0.sysctl0_qdata = n->sysctl_qdata; 336 node0.sysctl0_data = n->sysctl_data; 337 node0.sysctl0_func = NULL; 338 node0.sysctl0_parent = NULL; 339 node0.sysctl0_ver = n->sysctl_ver; 340 node0.sysctl0_flags &= ~SYSCTL_VERS_MASK; 341 node0.sysctl0_flags |= SYSCTL_VERS_0; 342 src = &node0; 343 sz = sizeof(node0); 344 break; 345 346 #if (SYSCTL_VERSION != SYSCTL_VERS_1) 347 #error __cvt_node_out: no support for SYSCTL_VERSION 348 #endif /* (SYSCTL_VERSION != SYSCTL_VERS_1) */ 349 350 case SYSCTL_VERSION: 351 sz = sizeof(struct sysctlnode); 352 break; 353 default: 354 sz = 0; 355 break; 356 } 357 358 if (sz > 0 && *o != NULL && *l >= sz) { 359 memcpy(*o, src, sz); 360 *o = sz + (caddr_t)*o; 361 *l -= sz; 362 } 363 364 return(sz); 365 } 366
Indexes created Thu Sep 25 16:09:42 GMT 2025