sysctl.c revision 1.25
1 /* $NetBSD: sysctl.c,v 1.25 2004/04/11 09:10:58 he 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 1.25 2004/04/11 09:10:58 he 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 "Whether the system's C-language development facilities " 182 "support the C-Language Bindings Option"), 183 #else 184 _INT("posix2_c_bind", USER_POSIX2_C_BIND, 0, 185 "Whether the system's C-language development facilities " 186 "support the C-Language Bindings Option"), 187 #endif 188 #ifdef POSIX2_C_DEV 189 _INT("posix2_c_dev", USER_POSIX2_C_DEV, 1, 190 "Whether the system supports the C-Language Development " 191 "Utilities Option"), 192 #else 193 _INT("posix2_c_dev", USER_POSIX2_C_DEV, 0, 194 "Whether the system supports the C-Language Development " 195 "Utilities Option"), 196 #endif 197 #ifdef POSIX2_CHAR_TERM 198 _INT("posix2_char_term", USER_POSIX2_CHAR_TERM, 1, 199 "Whether the system supports at least one terminal type " 200 "capable of all operations described in POSIX 1003.2"), 201 #else 202 _INT("posix2_char_term", USER_POSIX2_CHAR_TERM, 0, 203 "Whether the system supports at least one terminal type " 204 "capable of all operations described in POSIX 1003.2"), 205 #endif 206 #ifdef POSIX2_FORT_DEV 207 _INT("posix2_fort_dev", USER_POSIX2_FORT_DEV, 1, 208 "Whether the system supports the FORTRAN Development " 209 "Utilities Option"), 210 #else 211 _INT("posix2_fort_dev", USER_POSIX2_FORT_DEV, 0, 212 "Whether the system supports the FORTRAN Development " 213 "Utilities Option"), 214 #endif 215 #ifdef POSIX2_FORT_RUN 216 _INT("posix2_fort_run", USER_POSIX2_FORT_RUN, 1, 217 "Whether the system supports the FORTRAN Runtime " 218 "Utilities Option"), 219 #else 220 _INT("posix2_fort_run", USER_POSIX2_FORT_RUN, 0, 221 "Whether the system supports the FORTRAN Runtime " 222 "Utilities Option"), 223 #endif 224 #ifdef POSIX2_LOCALEDEF 225 _INT("posix2_localedef", USER_POSIX2_LOCALEDEF, 1, 226 "Whether the system supports the creation of locales"), 227 #else 228 _INT("posix2_localedef", USER_POSIX2_LOCALEDEF, 0, 229 "Whether the system supports the creation of locales"), 230 #endif 231 #ifdef POSIX2_SW_DEV 232 _INT("posix2_sw_dev", USER_POSIX2_SW_DEV, 1, 233 "Whether the system supports the Software Development " 234 "Utilities Option"), 235 #else 236 _INT("posix2_sw_dev", USER_POSIX2_SW_DEV, 0, 237 "Whether the system supports the Software Development " 238 "Utilities Option"), 239 #endif 240 #ifdef POSIX2_UPE 241 _INT("posix2_upe", USER_POSIX2_UPE, 1, 242 "Whether the system supports the User Portability " 243 "Utilities Option"), 244 #else 245 _INT("posix2_upe", USER_POSIX2_UPE, 0, 246 "Whether the system supports the User Portability " 247 "Utilities Option"), 248 #endif 249 _INT("stream_max", USER_STREAM_MAX, FOPEN_MAX, 250 "The minimum maximum number of streams that a process " 251 "may have open at any one time"), 252 _INT("tzname_max", USER_TZNAME_MAX, NAME_MAX, 253 "The minimum maximum number of types supported for the " 254 "name of a timezone"), 255 _INT("atexit_max", USER_ATEXIT_MAX, -1, 256 "The maximum number of functions that may be registered " 257 "with atexit(3)"), 258 #endif /* !lint */ 259 }; 260 #undef _INT 261 262 static const int clen = sizeof(sysctl_usermib) / 263 sizeof(sysctl_usermib[0]); 264 265 const struct sysctlnode *node; 266 int ni; 267 size_t l, sz; 268 269 /* 270 * none of these nodes are writable and they're all terminal (for now) 271 */ 272 if (namelen != 1) 273 return (EINVAL); 274 275 l = *oldlenp; 276 if (name[0] == CTL_QUERY) { 277 uint v; 278 node = newp; 279 if (node == NULL) { 280 v = SYSCTL_VERS_0; 281 newlen = sizeof(struct sysctlnode); 282 } 283 else if (SYSCTL_VERS(node->sysctl_flags) == SYSCTL_VERS_0 && 284 newlen == sizeof(struct sysctlnode0)) 285 v = SYSCTL_VERS_0; 286 else if (SYSCTL_VERS(node->sysctl_flags) == SYSCTL_VERS_1 && 287 newlen == sizeof(struct sysctlnode)) 288 v = SYSCTL_VERS_1; 289 else 290 return (EINVAL); 291 292 sz = 0; 293 for (ni = 0; ni < clen; ni++) 294 sz += __cvt_node_out(v, &sysctl_usermib[ni], &oldp, &l); 295 *oldlenp = sz; 296 return (0); 297 } 298 299 if (name[0] == CTL_DESCRIBE) { 300 /* 301 * XXX make sure this is larger than the largest 302 * "user" description 303 */ 304 char buf[192]; 305 struct sysctldesc *d1 = (void *)&buf[0], *d2 = oldp; 306 size_t d; 307 308 node = newp; 309 if (node != NULL && 310 (SYSCTL_VERS(node->sysctl_flags) < SYSCTL_VERS_1 || 311 newlen != sizeof(struct sysctlnode))) 312 return (EINVAL); 313 314 sz = 0; 315 for (ni = 0; ni < clen; ni++) { 316 memset(&buf[0], 0, sizeof(buf)); 317 if (node != NULL && 318 node->sysctl_num != sysctl_usermib[ni].sysctl_num) 319 continue; 320 d1->descr_num = sysctl_usermib[ni].sysctl_num; 321 d1->descr_ver = sysctl_usermib[ni].sysctl_ver; 322 if (sysctl_usermib[ni].sysctl_desc == NULL) 323 d1->descr_len = 1; 324 else { 325 strncpy(d1->descr_str, 326 sysctl_usermib[ni].sysctl_desc, 327 sizeof(buf) - sizeof(*d1)); 328 buf[sizeof(buf) - 1] = '\0'; 329 d1->descr_len = strlen(d1->descr_str) + 1; 330 } 331 d = (size_t)__sysc_desc_adv(NULL, d1->descr_len); 332 if (d2 != NULL) 333 memcpy(d2, d1, d); 334 sz += d; 335 if (node != NULL) 336 break; 337 } 338 *oldlenp = sz; 339 if (sz == 0 && node != NULL) 340 return (ENOENT); 341 return (0); 342 343 } 344 345 /* 346 * none of these nodes are writable 347 */ 348 if (newp != NULL || newlen != 0) 349 return (EPERM); 350 351 node = &sysctl_usermib[0]; 352 for (ni = 0; ni < clen; ni++) 353 if (name[0] == node[ni].sysctl_num) 354 break; 355 if (ni == clen) 356 return (EOPNOTSUPP); 357 358 node = &node[ni]; 359 if (node->sysctl_flags & CTLFLAG_IMMEDIATE) { 360 switch (SYSCTL_TYPE(node->sysctl_flags)) { 361 case CTLTYPE_INT: 362 newp = &node->sysctl_idata; 363 break; 364 case CTLTYPE_QUAD: 365 newp = &node->sysctl_qdata; 366 break; 367 default: 368 return (EINVAL); 369 } 370 } 371 else 372 newp = node->sysctl_data; 373 374 l = MIN(l, node->sysctl_size); 375 if (oldp != NULL) 376 memcpy(oldp, newp, l); 377 *oldlenp = node->sysctl_size; 378 379 return (0); 380 } 381 382 static size_t 383 __cvt_node_out(uint v, const struct sysctlnode *n, void **o, size_t *l) 384 { 385 struct sysctlnode0 node0; 386 const void *src = n; 387 size_t sz; 388 389 switch (v) { 390 case SYSCTL_VERS_0: 391 memset(&node0, 0, sizeof(node0)); 392 node0.sysctl0_flags = n->sysctl_flags; 393 node0.sysctl0_num = n->sysctl_num; 394 node0.sysctl0_size = n->sysctl_size; 395 memcpy(node0.sysctl0_name, n->sysctl_name, SYSCTL_NAMELEN); 396 node0.sysctl0_csize = n->sysctl_csize; 397 node0.sysctl0_clen = n->sysctl_clen; 398 node0.sysctl0_child = NULL; 399 node0.sysctl0_alias = n->sysctl_alias; 400 node0.sysctl0_idata = n->sysctl_idata; 401 node0.sysctl0_qdata = n->sysctl_qdata; 402 node0.sysctl0_data = n->sysctl_data; 403 node0.sysctl0_func = NULL; 404 node0.sysctl0_parent = NULL; 405 node0.sysctl0_ver = n->sysctl_ver; 406 node0.sysctl0_flags &= ~SYSCTL_VERS_MASK; 407 node0.sysctl0_flags |= SYSCTL_VERS_0; 408 src = &node0; 409 sz = sizeof(node0); 410 break; 411 412 #if (SYSCTL_VERSION != SYSCTL_VERS_1) 413 #error __cvt_node_out: no support for SYSCTL_VERSION 414 #endif /* (SYSCTL_VERSION != SYSCTL_VERS_1) */ 415 416 case SYSCTL_VERSION: 417 sz = sizeof(struct sysctlnode); 418 break; 419 default: 420 sz = 0; 421 break; 422 } 423 424 if (sz > 0 && *o != NULL && *l >= sz) { 425 memcpy(*o, src, sz); 426 *o = sz + (caddr_t)*o; 427 *l -= sz; 428 } 429 430 return(sz); 431 } 432
Indexes created Thu Sep 25 16:09:42 GMT 2025