sysctl.c revision 1.24
1 /* $NetBSD: sysctl.c,v 1.24 2004/04/08 04:10:44 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 1.24 2004/04/08 04:10:44 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 sysc_init_field(_sysctl_size, sizeof(int)), \ 119 .sysctl_name = (s), \ 120 .sysctl_num = (n), \ 121 .sysctl_un = { .scu_idata = (v), }, \ 122 sysc_init_field(_sysctl_desc, (d)), \ 123 } 124 125 /* 126 * the nodes under the "user" node 127 */ 128 static const struct sysctlnode sysctl_usermib[] = { 129 #if defined(lint) 130 /* 131 * lint doesn't like my initializers 132 */ 133 0 134 #else /* !lint */ 135 { 136 .sysctl_flags = SYSCTL_VERSION|CTLFLAG_PERMANENT| 137 CTLTYPE_STRING, 138 sysc_init_field(_sysctl_size, sizeof(_PATH_STDPATH)), 139 .sysctl_name = "cs_path", 140 .sysctl_num = USER_CS_PATH, 141 /* 142 * XXX these nasty initializers (and the one in 143 * the _INT() macro) can go away once all ports 144 * are using gcc3, and become 145 * 146 * .sysctl_data = _PATH_STDPATH, 147 * .sysctl_desc = NULL, 148 */ 149 .sysctl_un = { .scu_data = { 150 sysc_init_field(_sud_data, _PATH_STDPATH), 151 }, }, 152 sysc_init_field(_sysctl_desc, 153 "A value for the PATH environment variable " 154 "that finds all the standard utilities"), 155 }, 156 _INT("bc_base_max", USER_BC_BASE_MAX, BC_BASE_MAX, 157 "The maximum ibase/obase values in the bc(1) utility"), 158 _INT("bc_dim_max", USER_BC_DIM_MAX, BC_DIM_MAX, 159 "The maximum array size in the bc(1) utility"), 160 _INT("bc_scale_max", USER_BC_SCALE_MAX, BC_SCALE_MAX, 161 "The maximum scale value in the bc(1) utility"), 162 _INT("bc_string_max", USER_BC_STRING_MAX, BC_STRING_MAX, 163 "The maximum string length in the bc(1) utility"), 164 _INT("coll_weights_max", USER_COLL_WEIGHTS_MAX, 165 COLL_WEIGHTS_MAX, "The maximum number of weights that can " 166 "be assigned to any entry of the LC_COLLATE order keyword " 167 "in the locale definition file"), 168 _INT("expr_nest_max", USER_EXPR_NEST_MAX, EXPR_NEST_MAX, 169 "The maximum number of expressions that can be nested " 170 "within parenthesis by the expr(1) utility"), 171 _INT("line_max", USER_LINE_MAX, LINE_MAX, "The maximum length " 172 "in bytes of a text-processing utility's input line"), 173 _INT("re_dup_max", USER_RE_DUP_MAX, RE_DUP_MAX, "The maximum " 174 "number of repeated occurrences of a regular expression " 175 "permitted when using interval notation"), 176 _INT("posix2_version", USER_POSIX2_VERSION, _POSIX2_VERSION, 177 "The version of POSIX 1003.2 with which the system " 178 "attempts to comply"), 179 #ifdef POSIX2_C_BIND 180 _INT("posix2_c_bind", USER_POSIX2_C_BIND, 1, 181 #else 182 _INT("posix2_c_bind", USER_POSIX2_C_BIND, 0, 183 #endif 184 "Whether the system's C-language development facilities " 185 "support the C-Language Bindings Option"), 186 #ifdef POSIX2_C_DEV 187 _INT("posix2_c_dev", USER_POSIX2_C_DEV, 1, 188 #else 189 _INT("posix2_c_dev", USER_POSIX2_C_DEV, 0, 190 #endif 191 "Whether the system supports the C-Language Development " 192 "Utilities Option"), 193 #ifdef POSIX2_CHAR_TERM 194 _INT("posix2_char_term", USER_POSIX2_CHAR_TERM, 1, 195 #else 196 _INT("posix2_char_term", USER_POSIX2_CHAR_TERM, 0, 197 #endif 198 "Whether the system supports at least one terminal type " 199 "capable of all operations described in POSIX 1003.2"), 200 #ifdef POSIX2_FORT_DEV 201 _INT("posix2_fort_dev", USER_POSIX2_FORT_DEV, 1, 202 #else 203 _INT("posix2_fort_dev", USER_POSIX2_FORT_DEV, 0, 204 #endif 205 "Whether the system supports the FORTRAN Development " 206 "Utilities Option"), 207 #ifdef POSIX2_FORT_RUN 208 _INT("posix2_fort_run", USER_POSIX2_FORT_RUN, 1, 209 #else 210 _INT("posix2_fort_run", USER_POSIX2_FORT_RUN, 0, 211 #endif 212 "Whether the system supports the FORTRAN Runtime " 213 "Utilities Option"), 214 #ifdef POSIX2_LOCALEDEF 215 _INT("posix2_localedef", USER_POSIX2_LOCALEDEF, 1, 216 #else 217 _INT("posix2_localedef", USER_POSIX2_LOCALEDEF, 0, 218 #endif 219 "Whether the system supports the creation of locales"), 220 #ifdef POSIX2_SW_DEV 221 _INT("posix2_sw_dev", USER_POSIX2_SW_DEV, 1, 222 #else 223 _INT("posix2_sw_dev", USER_POSIX2_SW_DEV, 0, 224 #endif 225 "Whether the system supports the Software Development " 226 "Utilities Option"), 227 #ifdef POSIX2_UPE 228 _INT("posix2_upe", USER_POSIX2_UPE, 1, 229 #else 230 _INT("posix2_upe", USER_POSIX2_UPE, 0, 231 #endif 232 "Whether the system supports the User Portability " 233 "Utilities Option"), 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, NAME_MAX, 238 "The minimum maximum number of types supported for the " 239 "name of a timezone"), 240 _INT("atexit_max", USER_ATEXIT_MAX, -1, 241 "The maximum number of functions that may be registered " 242 "with atexit(3)"), 243 #endif /* !lint */ 244 }; 245 #undef _INT 246 247 static const int clen = sizeof(sysctl_usermib) / 248 sizeof(sysctl_usermib[0]); 249 250 const struct sysctlnode *node; 251 int ni; 252 size_t l, sz; 253 254 /* 255 * none of these nodes are writable and they're all terminal (for now) 256 */ 257 if (namelen != 1) 258 return (EINVAL); 259 260 l = *oldlenp; 261 if (name[0] == CTL_QUERY) { 262 uint v; 263 node = newp; 264 if (node == NULL) { 265 v = SYSCTL_VERS_0; 266 newlen = sizeof(struct sysctlnode); 267 } 268 else if (SYSCTL_VERS(node->sysctl_flags) == SYSCTL_VERS_0 && 269 newlen == sizeof(struct sysctlnode0)) 270 v = SYSCTL_VERS_0; 271 else if (SYSCTL_VERS(node->sysctl_flags) == SYSCTL_VERS_1 && 272 newlen == sizeof(struct sysctlnode)) 273 v = SYSCTL_VERS_1; 274 else 275 return (EINVAL); 276 277 sz = 0; 278 for (ni = 0; ni < clen; ni++) 279 sz += __cvt_node_out(v, &sysctl_usermib[ni], &oldp, &l); 280 *oldlenp = sz; 281 return (0); 282 } 283 284 if (name[0] == CTL_DESCRIBE) { 285 /* 286 * XXX make sure this is larger than the largest 287 * "user" description 288 */ 289 char buf[192]; 290 struct sysctldesc *d1 = (void *)&buf[0], *d2 = oldp; 291 size_t d; 292 293 node = newp; 294 if (node != NULL && 295 (SYSCTL_VERS(node->sysctl_flags) < SYSCTL_VERS_1 || 296 newlen != sizeof(struct sysctlnode))) 297 return (EINVAL); 298 299 sz = 0; 300 for (ni = 0; ni < clen; ni++) { 301 memset(&buf[0], 0, sizeof(buf)); 302 if (node != NULL && 303 node->sysctl_num != sysctl_usermib[ni].sysctl_num) 304 continue; 305 d1->descr_num = sysctl_usermib[ni].sysctl_num; 306 d1->descr_ver = sysctl_usermib[ni].sysctl_ver; 307 if (sysctl_usermib[ni].sysctl_desc == NULL) 308 d1->descr_len = 1; 309 else { 310 strncpy(d1->descr_str, 311 sysctl_usermib[ni].sysctl_desc, 312 sizeof(buf) - sizeof(*d1)); 313 buf[sizeof(buf) - 1] = '\0'; 314 d1->descr_len = strlen(d1->descr_str) + 1; 315 } 316 d = (size_t)__sysc_desc_adv(NULL, d1->descr_len); 317 if (d2 != NULL) 318 memcpy(d2, d1, d); 319 sz += d; 320 if (node != NULL) 321 break; 322 } 323 *oldlenp = sz; 324 if (sz == 0 && node != NULL) 325 return (ENOENT); 326 return (0); 327 328 } 329 330 /* 331 * none of these nodes are writable 332 */ 333 if (newp != NULL || newlen != 0) 334 return (EPERM); 335 336 node = &sysctl_usermib[0]; 337 for (ni = 0; ni < clen; ni++) 338 if (name[0] == node[ni].sysctl_num) 339 break; 340 if (ni == clen) 341 return (EOPNOTSUPP); 342 343 node = &node[ni]; 344 if (node->sysctl_flags & CTLFLAG_IMMEDIATE) { 345 switch (SYSCTL_TYPE(node->sysctl_flags)) { 346 case CTLTYPE_INT: 347 newp = &node->sysctl_idata; 348 break; 349 case CTLTYPE_QUAD: 350 newp = &node->sysctl_qdata; 351 break; 352 default: 353 return (EINVAL); 354 } 355 } 356 else 357 newp = node->sysctl_data; 358 359 l = MIN(l, node->sysctl_size); 360 if (oldp != NULL) 361 memcpy(oldp, newp, l); 362 *oldlenp = node->sysctl_size; 363 364 return (0); 365 } 366 367 static size_t 368 __cvt_node_out(uint v, const struct sysctlnode *n, void **o, size_t *l) 369 { 370 struct sysctlnode0 node0; 371 const void *src = n; 372 size_t sz; 373 374 switch (v) { 375 case SYSCTL_VERS_0: 376 memset(&node0, 0, sizeof(node0)); 377 node0.sysctl0_flags = n->sysctl_flags; 378 node0.sysctl0_num = n->sysctl_num; 379 node0.sysctl0_size = n->sysctl_size; 380 memcpy(node0.sysctl0_name, n->sysctl_name, SYSCTL_NAMELEN); 381 node0.sysctl0_csize = n->sysctl_csize; 382 node0.sysctl0_clen = n->sysctl_clen; 383 node0.sysctl0_child = NULL; 384 node0.sysctl0_alias = n->sysctl_alias; 385 node0.sysctl0_idata = n->sysctl_idata; 386 node0.sysctl0_qdata = n->sysctl_qdata; 387 node0.sysctl0_data = n->sysctl_data; 388 node0.sysctl0_func = NULL; 389 node0.sysctl0_parent = NULL; 390 node0.sysctl0_ver = n->sysctl_ver; 391 node0.sysctl0_flags &= ~SYSCTL_VERS_MASK; 392 node0.sysctl0_flags |= SYSCTL_VERS_0; 393 src = &node0; 394 sz = sizeof(node0); 395 break; 396 397 #if (SYSCTL_VERSION != SYSCTL_VERS_1) 398 #error __cvt_node_out: no support for SYSCTL_VERSION 399 #endif /* (SYSCTL_VERSION != SYSCTL_VERS_1) */ 400 401 case SYSCTL_VERSION: 402 sz = sizeof(struct sysctlnode); 403 break; 404 default: 405 sz = 0; 406 break; 407 } 408 409 if (sz > 0 && *o != NULL && *l >= sz) { 410 memcpy(*o, src, sz); 411 *o = sz + (caddr_t)*o; 412 *l -= sz; 413 } 414 415 return(sz); 416 } 417
Indexes created Thu Sep 25 16:09:42 GMT 2025