sysctl.c revision 1.27
1/* $NetBSD: sysctl.c,v 1.27 2004/09/07 13:20:39 jrf 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 35static char sccsid[] = "@(#)sysctl.c 8.2 (Berkeley) 1/4/94"; 36#else 37__RCSID("$NetBSD: sysctl.c,v 1.27 2004/09/07 13:20:39 jrf 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 */ 60static 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 */ 65static size_t __cvt_node_out(uint, const struct sysctlnode *, void **, 66 size_t *); 67 68#include <stdlib.h> 69 70int 71sysctl(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 107static int 108user_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 return (EINVAL); 281 else if (SYSCTL_VERS(node->sysctl_flags) == SYSCTL_VERS_1 && 282 newlen == sizeof(struct sysctlnode)) 283 v = SYSCTL_VERS_1; 284 else 285 return (EINVAL); 286 287 sz = 0; 288 for (ni = 0; ni < clen; ni++) 289 sz += __cvt_node_out(v, &sysctl_usermib[ni], &oldp, &l); 290 *oldlenp = sz; 291 return (0); 292 } 293 294 if (name[0] == CTL_DESCRIBE) { 295 /* 296 * XXX make sure this is larger than the largest 297 * "user" description 298 */ 299 char buf[192]; 300 struct sysctldesc *d1 = (void *)&buf[0], *d2 = oldp; 301 size_t d; 302 303 node = newp; 304 if (node != NULL && 305 (SYSCTL_VERS(node->sysctl_flags) < SYSCTL_VERS_1 || 306 newlen != sizeof(struct sysctlnode))) 307 return (EINVAL); 308 309 sz = 0; 310 for (ni = 0; ni < clen; ni++) { 311 memset(&buf[0], 0, sizeof(buf)); 312 if (node != NULL && 313 node->sysctl_num != sysctl_usermib[ni].sysctl_num) 314 continue; 315 d1->descr_num = sysctl_usermib[ni].sysctl_num; 316 d1->descr_ver = sysctl_usermib[ni].sysctl_ver; 317 if (sysctl_usermib[ni].sysctl_desc == NULL) 318 d1->descr_len = 1; 319 else { 320 (void)strlcpy(d1->descr_str, 321 sysctl_usermib[ni].sysctl_desc, 322 sizeof(buf) - sizeof(*d1)); 323 d1->descr_len = strlen(d1->descr_str) + 1; 324 } 325 d = (size_t)__sysc_desc_adv(NULL, d1->descr_len); 326 if (d2 != NULL) 327 memcpy(d2, d1, d); 328 sz += d; 329 if (node != NULL) 330 break; 331 } 332 *oldlenp = sz; 333 if (sz == 0 && node != NULL) 334 return (ENOENT); 335 return (0); 336 337 } 338 339 /* 340 * none of these nodes are writable 341 */ 342 if (newp != NULL || newlen != 0) 343 return (EPERM); 344 345 node = &sysctl_usermib[0]; 346 for (ni = 0; ni < clen; ni++) 347 if (name[0] == node[ni].sysctl_num) 348 break; 349 if (ni == clen) 350 return (EOPNOTSUPP); 351 352 node = &node[ni]; 353 if (node->sysctl_flags & CTLFLAG_IMMEDIATE) { 354 switch (SYSCTL_TYPE(node->sysctl_flags)) { 355 case CTLTYPE_INT: 356 newp = &node->sysctl_idata; 357 break; 358 case CTLTYPE_QUAD: 359 newp = &node->sysctl_qdata; 360 break; 361 default: 362 return (EINVAL); 363 } 364 } 365 else 366 newp = node->sysctl_data; 367 368 l = MIN(l, node->sysctl_size); 369 if (oldp != NULL) 370 memcpy(oldp, newp, l); 371 *oldlenp = node->sysctl_size; 372 373 return (0); 374} 375 376static size_t 377__cvt_node_out(uint v, const struct sysctlnode *n, void **o, size_t *l) 378{ 379 const void *src = n; 380 size_t sz; 381 382 switch (v) { 383#if (SYSCTL_VERSION != SYSCTL_VERS_1) 384#error __cvt_node_out: no support for SYSCTL_VERSION 385#endif /* (SYSCTL_VERSION != SYSCTL_VERS_1) */ 386 387 case SYSCTL_VERSION: 388 sz = sizeof(struct sysctlnode); 389 break; 390 391 default: 392 sz = 0; 393 break; 394 } 395 396 if (sz > 0 && *o != NULL && *l >= sz) { 397 memcpy(*o, src, sz); 398 *o = sz + (caddr_t)*o; 399 *l -= sz; 400 } 401 402 return(sz); 403} 404