1 /* $NetBSD: sysctl.c,v 1.43 2026/07/10 21:54:30 kre 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 1.43 2026/07/10 21:54:30 kre 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 <assert.h> 47 #include <errno.h> 48 #include <paths.h> 49 #include <stdio.h> 50 #include <string.h> 51 #include <time.h> 52 #include <unistd.h> 53 #include "extern.h" 54 55 #ifdef __weak_alias 56 __weak_alias(sysctl,_sysctl) 57 #endif 58 59 /* 60 * handles requests off the user subtree 61 */ 62 static int user_sysctl(const int *, u_int, void *, size_t *, 63 const void *, size_t); 64 65 /* 66 * copies out individual nodes taking target version into account 67 */ 68 static size_t __cvt_node_out(uint, const struct sysctlnode *, void **, 69 size_t *); 70 71 #include <stdlib.h> 72 73 int 74 sysctl(const int *name, unsigned int namelen, 75 void *oldp, size_t *oldlenp, 76 const void *newp, size_t newlen) 77 { 78 size_t oldlen, savelen; 79 int error; 80 81 if (name[0] != CTL_USER) 82 return (__sysctl(name, namelen, oldp, oldlenp, 83 newp, newlen)); 84 85 oldlen = (oldlenp == NULL) ? 0 : *oldlenp; 86 savelen = oldlen; 87 error = user_sysctl(name + 1, namelen - 1, oldp, &oldlen, newp, newlen); 88 89 if (error != 0) { 90 errno = error; 91 return (-1); 92 } 93 94 if (oldlenp != NULL) { 95 *oldlenp = oldlen; 96 if (oldp != NULL && oldlen > savelen) { 97 errno = ENOMEM; 98 return (-1); 99 } 100 } 101 102 return (0); 103 } 104 105 static int 106 user_sysctl(const int *name, unsigned int namelen, 107 void *oldp, size_t *oldlenp, 108 const void *newp, size_t newlen) 109 { 110 #ifndef SMALL 111 #define X(a) a 112 #else 113 #define X(a) "" 114 #endif 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_un.scu_idata = (v), \ 122 .sysctl_desc = X(d), \ 123 } 124 125 #define _STRING(s, n, v, d) { \ 126 .sysctl_flags = SYSCTL_VERSION|CTLFLAG_PERMANENT|CTLTYPE_STRING, \ 127 .sysctl_size = sizeof(v), \ 128 .sysctl_name = (s), \ 129 .sysctl_num = (n), \ 130 .sysctl_data = __UNCONST(v), \ 131 .sysctl_desc = X(d), \ 132 } 133 134 /* 135 * the nodes under the "user" node 136 */ 137 static const struct sysctlnode sysctl_usermib[] = { 138 _STRING("cs_path", USER_CS_PATH, _PATH_STDPATH, 139 "A value for the PATH environment variable " 140 "that finds all the standard utilities"), 141 _INT("bc_base_max", USER_BC_BASE_MAX, BC_BASE_MAX, 142 "The maximum ibase/obase values in the bc(1) utility"), 143 _INT("bc_dim_max", USER_BC_DIM_MAX, BC_DIM_MAX, 144 "The maximum array size in the bc(1) utility"), 145 _INT("bc_scale_max", USER_BC_SCALE_MAX, BC_SCALE_MAX, 146 "The maximum scale value in the bc(1) utility"), 147 _INT("bc_string_max", USER_BC_STRING_MAX, BC_STRING_MAX, 148 "The maximum string length in the bc(1) utility"), 149 _INT("coll_weights_max", USER_COLL_WEIGHTS_MAX, 150 COLL_WEIGHTS_MAX, "The maximum number of weights that can " 151 "be assigned to any entry of the LC_COLLATE order keyword " 152 "in the locale definition file"), 153 _INT("expr_nest_max", USER_EXPR_NEST_MAX, EXPR_NEST_MAX, 154 "The maximum number of expressions that can be nested " 155 "within parenthesis by the expr(1) utility"), 156 _INT("line_max", USER_LINE_MAX, LINE_MAX, "The maximum length " 157 "in bytes of a text-processing utility's input line"), 158 _INT("re_dup_max", USER_RE_DUP_MAX, RE_DUP_MAX, "The maximum " 159 "number of repeated occurrences of a regular expression " 160 "permitted when using interval notation"), 161 _INT("posix2_version", USER_POSIX2_VERSION, _POSIX2_VERSION, 162 "The version of POSIX 1003.2 with which the system " 163 "attempts to comply"), 164 #ifdef _POSIX2_C_BIND 165 _INT("posix2_c_bind", USER_POSIX2_C_BIND, 1, 166 "Whether the system's C-language development facilities " 167 "support the C-Language Bindings Option"), 168 #else 169 _INT("posix2_c_bind", USER_POSIX2_C_BIND, 0, 170 "Whether the system's C-language development facilities " 171 "support the C-Language Bindings Option"), 172 #endif 173 #ifdef POSIX2_C_DEV 174 _INT("posix2_c_dev", USER_POSIX2_C_DEV, 1, 175 "Whether the system supports the C-Language Development " 176 "Utilities Option"), 177 #else 178 _INT("posix2_c_dev", USER_POSIX2_C_DEV, 0, 179 "Whether the system supports the C-Language Development " 180 "Utilities Option"), 181 #endif 182 #ifdef POSIX2_CHAR_TERM 183 _INT("posix2_char_term", USER_POSIX2_CHAR_TERM, 1, 184 "Whether the system supports at least one terminal type " 185 "capable of all operations described in POSIX 1003.2"), 186 #else 187 _INT("posix2_char_term", USER_POSIX2_CHAR_TERM, 0, 188 "Whether the system supports at least one terminal type " 189 "capable of all operations described in POSIX 1003.2"), 190 #endif 191 #ifdef POSIX2_FORT_DEV 192 _INT("posix2_fort_dev", USER_POSIX2_FORT_DEV, 1, 193 "Whether the system supports the FORTRAN Development " 194 "Utilities Option"), 195 #else 196 _INT("posix2_fort_dev", USER_POSIX2_FORT_DEV, 0, 197 "Whether the system supports the FORTRAN Development " 198 "Utilities Option"), 199 #endif 200 #ifdef POSIX2_FORT_RUN 201 _INT("posix2_fort_run", USER_POSIX2_FORT_RUN, 1, 202 "Whether the system supports the FORTRAN Runtime " 203 "Utilities Option"), 204 #else 205 _INT("posix2_fort_run", USER_POSIX2_FORT_RUN, 0, 206 "Whether the system supports the FORTRAN Runtime " 207 "Utilities Option"), 208 #endif 209 #ifdef POSIX2_LOCALEDEF 210 _INT("posix2_localedef", USER_POSIX2_LOCALEDEF, 1, 211 "Whether the system supports the creation of locales"), 212 #else 213 _INT("posix2_localedef", USER_POSIX2_LOCALEDEF, 0, 214 "Whether the system supports the creation of locales"), 215 #endif 216 #ifdef POSIX2_SW_DEV 217 _INT("posix2_sw_dev", USER_POSIX2_SW_DEV, 1, 218 "Whether the system supports the Software Development " 219 "Utilities Option"), 220 #else 221 _INT("posix2_sw_dev", USER_POSIX2_SW_DEV, 0, 222 "Whether the system supports the Software Development " 223 "Utilities Option"), 224 #endif 225 #ifdef POSIX2_UPE 226 _INT("posix2_upe", USER_POSIX2_UPE, 1, 227 "Whether the system supports the User Portability " 228 "Utilities Option"), 229 #else 230 _INT("posix2_upe", USER_POSIX2_UPE, 0, 231 "Whether the system supports the User Portability " 232 "Utilities Option"), 233 #endif 234 _INT("stream_max", USER_STREAM_MAX, FOPEN_MAX, 235 "The minimum maximum number of streams that a process " 236 "may have open at any one time"), 237 _INT("tzname_max", USER_TZNAME_MAX, _TZNAME_MAXIMUM, 238 "The minimum maximum number of bytes supported for the " 239 "name of a timezone abbreviation"), 240 _INT("atexit_max", USER_ATEXIT_MAX, -1, 241 "The maximum number of functions that may be registered " 242 "with atexit(3)"), 243 244 #ifdef USER_OSTYPE_VALUE 245 _STRING("ostype", USER_OSTYPE, USER_OSTYPE_VALUE, 246 "The name of the operating system"), 247 #endif 248 #ifdef USER_OSREVISION_VALUE 249 _INT("osrevision", USER_OSREVISION, USER_OSREVISION_VALUE, 250 "A numeric representation of the OS version"), 251 #endif 252 #ifdef USER_OSRELEASE_VALUE 253 _STRING("osrelease", USER_OSRELEASE, USER_OSRELEASE_VALUE, 254 "The system version of the libraries & utilities"), 255 #endif 256 #ifdef USER_BUILDTIME_VALUE 257 _STRING("built", USER_BUILDTIME, USER_BUILDTIME_VALUE, 258 "The date & time (UTC) at which libc was last built " 259 "- if with a trailing '!' the reproducible build time"), 260 #endif 261 }; 262 #undef X 263 #undef _INT 264 #undef _STRING 265 266 static const int clen = sizeof(sysctl_usermib) / 267 sizeof(sysctl_usermib[0]); 268 269 const struct sysctlnode *node; 270 int ni; 271 size_t l, sz; 272 273 /* 274 * none of these nodes are writable and they're all terminal (for now) 275 */ 276 if (namelen != 1) 277 return (EINVAL); 278 279 l = *oldlenp; 280 if (name[0] == CTL_QUERY) { 281 uint v; 282 node = newp; 283 if (node == NULL) 284 return (EINVAL); 285 else if (SYSCTL_VERS(node->sysctl_flags) == SYSCTL_VERS_1 && 286 newlen == sizeof(struct sysctlnode)) 287 v = SYSCTL_VERS_1; 288 else 289 return (EINVAL); 290 291 sz = 0; 292 for (ni = 0; ni < clen; ni++) 293 sz += __cvt_node_out(v, &sysctl_usermib[ni], &oldp, &l); 294 *oldlenp = sz; 295 return (0); 296 } 297 298 if (name[0] == CTL_DESCRIBE) { 299 /* 300 * XXX make sure this is larger than the largest 301 * "user" description 302 */ 303 char buf[192]; 304 struct sysctldesc *d1 = (void *)&buf[0], *d2 = oldp; 305 size_t d; 306 307 node = newp; 308 if (node != NULL && 309 (SYSCTL_VERS(node->sysctl_flags) < SYSCTL_VERS_1 || 310 newlen != sizeof(struct sysctlnode))) 311 return (EINVAL); 312 313 sz = 0; 314 for (ni = 0; ni < clen; ni++) { 315 memset(&buf[0], 0, sizeof(buf)); 316 if (node != NULL && 317 node->sysctl_num != sysctl_usermib[ni].sysctl_num) 318 continue; 319 d1->descr_num = sysctl_usermib[ni].sysctl_num; 320 d1->descr_ver = sysctl_usermib[ni].sysctl_ver; 321 if (sysctl_usermib[ni].sysctl_desc == NULL) 322 d1->descr_len = 1; 323 else { 324 size_t dlen; 325 (void)strlcpy(d1->descr_str, 326 sysctl_usermib[ni].sysctl_desc, 327 sizeof(buf) - sizeof(*d1)); 328 dlen = strlen(d1->descr_str) + 1; 329 _DIAGASSERT(__type_fit(uint32_t, dlen)); 330 d1->descr_len = (uint32_t)dlen; 331 } 332 d = (size_t)__sysc_desc_len(d1->descr_len); 333 if (d2 != NULL) 334 memcpy(d2, d1, d); 335 sz += d; 336 d2 = (void *)((char *)(void *)d2 + d); 337 if (node != NULL) 338 break; 339 } 340 *oldlenp = sz; 341 if (sz == 0 && node != NULL) 342 return (ENOENT); 343 return (0); 344 345 } 346 347 /* 348 * none of these nodes are writable 349 */ 350 if (newp != NULL || newlen != 0) 351 return (EPERM); 352 353 node = &sysctl_usermib[0]; 354 for (ni = 0; ni < clen; ni++) 355 if (name[0] == node[ni].sysctl_num) 356 break; 357 if (ni == clen) 358 return (EOPNOTSUPP); 359 360 node = &node[ni]; 361 if (node->sysctl_flags & CTLFLAG_IMMEDIATE) { 362 switch (SYSCTL_TYPE(node->sysctl_flags)) { 363 case CTLTYPE_INT: 364 newp = &node->sysctl_idata; 365 break; 366 case CTLTYPE_QUAD: 367 newp = &node->sysctl_qdata; 368 break; 369 default: 370 return (EINVAL); 371 } 372 } 373 else 374 newp = node->sysctl_data; 375 376 l = MIN(l, node->sysctl_size); 377 if (oldp != NULL) 378 memcpy(oldp, newp, l); 379 *oldlenp = node->sysctl_size; 380 381 return (0); 382 } 383 384 static size_t 385 __cvt_node_out(uint v, const struct sysctlnode *n, void **o, size_t *l) 386 { 387 const void *src = n; 388 size_t sz; 389 390 switch (v) { 391 #if (SYSCTL_VERSION != SYSCTL_VERS_1) 392 #error __cvt_node_out: no support for SYSCTL_VERSION 393 #endif /* (SYSCTL_VERSION != SYSCTL_VERS_1) */ 394 395 case SYSCTL_VERSION: 396 sz = sizeof(struct sysctlnode); 397 break; 398 399 default: 400 sz = 0; 401 break; 402 } 403 404 if (sz > 0 && *o != NULL && *l >= sz) { 405 memcpy(*o, src, sz); 406 *o = sz + (caddr_t)*o; 407 *l -= sz; 408 } 409 410 return(sz); 411 } 412
Indexes created Sun Oct 25 00:26:45 UTC 2026