1 /* $NetBSD: sysctl.c,v 1.32 2012/03/20 16:36:05 matt 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 1.32 2012/03/20 16:36:05 matt 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 <unistd.h> 52 #include "extern.h" 53 54 #ifdef __weak_alias 55 __weak_alias(sysctl,_sysctl) 56 #endif 57 58 /* 59 * handles requests off the user subtree 60 */ 61 static int user_sysctl(const int *, u_int, void *, size_t *, 62 const void *, size_t); 63 64 /* 65 * copies out individual nodes taking target version into account 66 */ 67 static size_t __cvt_node_out(uint, const struct sysctlnode *, void **, 68 size_t *); 69 70 #include <stdlib.h> 71 72 #if defined(__minix) 73 int __sysctl(const int *name, unsigned int namelen, 74 void *oldp, size_t *oldlenp, 75 const void *newp, size_t newlen) 76 { 77 return ENOENT; 78 } 79 #endif /* defined(__minix) */ 80 81 int 82 sysctl(const int *name, unsigned int namelen, 83 void *oldp, size_t *oldlenp, 84 const void *newp, size_t newlen) 85 { 86 size_t oldlen, savelen; 87 int error; 88 89 if (name[0] != CTL_USER) 90 return (__sysctl(name, namelen, oldp, oldlenp, 91 newp, newlen)); 92 93 oldlen = (oldlenp == NULL) ? 0 : *oldlenp; 94 savelen = oldlen; 95 error = user_sysctl(name + 1, namelen - 1, oldp, &oldlen, newp, newlen); 96 97 if (error != 0) { 98 errno = error; 99 return (-1); 100 } 101 102 if (oldlenp != NULL) { 103 *oldlenp = oldlen; 104 if (oldp != NULL && oldlen > savelen) { 105 errno = ENOMEM; 106 return (-1); 107 } 108 } 109 110 return (0); 111 } 112 113 static int 114 user_sysctl(const int *name, unsigned int namelen, 115 void *oldp, size_t *oldlenp, 116 const void *newp, size_t newlen) 117 { 118 #define _INT(s, n, v, d) { \ 119 .sysctl_flags = CTLFLAG_IMMEDIATE|CTLFLAG_PERMANENT| \ 120 CTLTYPE_INT|SYSCTL_VERSION, \ 121 sysc_init_field(_sysctl_size, sizeof(int)), \ 122 .sysctl_name = (s), \ 123 .sysctl_num = (n), \ 124 .sysctl_un = { .scu_idata = (v), }, \ 125 sysc_init_field(_sysctl_desc, (d)), \ 126 } 127 128 /* 129 * the nodes under the "user" node 130 */ 131 static const struct sysctlnode sysctl_usermib[] = { 132 #if defined(lint) 133 /* 134 * lint doesn't like my initializers 135 */ 136 0 137 #else /* !lint */ 138 { 139 .sysctl_flags = SYSCTL_VERSION|CTLFLAG_PERMANENT| 140 CTLTYPE_STRING, 141 sysc_init_field(_sysctl_size, sizeof(_PATH_STDPATH)), 142 .sysctl_name = "cs_path", 143 .sysctl_num = USER_CS_PATH, 144 /* 145 * XXX these nasty initializers (and the one in 146 * the _INT() macro) can go away once all ports 147 * are using gcc3, and become 148 * 149 * .sysctl_data = _PATH_STDPATH, 150 * .sysctl_desc = NULL, 151 */ 152 .sysctl_un = { .scu_data = { 153 sysc_init_field(_sud_data, 154 __UNCONST(_PATH_STDPATH)), 155 }, }, 156 sysc_init_field(_sysctl_desc, 157 "A value for the PATH environment variable " 158 "that finds all the standard utilities"), 159 }, 160 _INT("bc_base_max", USER_BC_BASE_MAX, BC_BASE_MAX, 161 "The maximum ibase/obase values in the bc(1) utility"), 162 _INT("bc_dim_max", USER_BC_DIM_MAX, BC_DIM_MAX, 163 "The maximum array size in the bc(1) utility"), 164 _INT("bc_scale_max", USER_BC_SCALE_MAX, BC_SCALE_MAX, 165 "The maximum scale value in the bc(1) utility"), 166 _INT("bc_string_max", USER_BC_STRING_MAX, BC_STRING_MAX, 167 "The maximum string length in the bc(1) utility"), 168 _INT("coll_weights_max", USER_COLL_WEIGHTS_MAX, 169 COLL_WEIGHTS_MAX, "The maximum number of weights that can " 170 "be assigned to any entry of the LC_COLLATE order keyword " 171 "in the locale definition file"), 172 _INT("expr_nest_max", USER_EXPR_NEST_MAX, EXPR_NEST_MAX, 173 "The maximum number of expressions that can be nested " 174 "within parenthesis by the expr(1) utility"), 175 _INT("line_max", USER_LINE_MAX, LINE_MAX, "The maximum length " 176 "in bytes of a text-processing utility's input line"), 177 _INT("re_dup_max", USER_RE_DUP_MAX, RE_DUP_MAX, "The maximum " 178 "number of repeated occurrences of a regular expression " 179 "permitted when using interval notation"), 180 _INT("posix2_version", USER_POSIX2_VERSION, _POSIX2_VERSION, 181 "The version of POSIX 1003.2 with which the system " 182 "attempts to comply"), 183 #ifdef _POSIX2_C_BIND 184 _INT("posix2_c_bind", USER_POSIX2_C_BIND, 1, 185 "Whether the system's C-language development facilities " 186 "support the C-Language Bindings Option"), 187 #else 188 _INT("posix2_c_bind", USER_POSIX2_C_BIND, 0, 189 "Whether the system's C-language development facilities " 190 "support the C-Language Bindings Option"), 191 #endif 192 #ifdef POSIX2_C_DEV 193 _INT("posix2_c_dev", USER_POSIX2_C_DEV, 1, 194 "Whether the system supports the C-Language Development " 195 "Utilities Option"), 196 #else 197 _INT("posix2_c_dev", USER_POSIX2_C_DEV, 0, 198 "Whether the system supports the C-Language Development " 199 "Utilities Option"), 200 #endif 201 #ifdef POSIX2_CHAR_TERM 202 _INT("posix2_char_term", USER_POSIX2_CHAR_TERM, 1, 203 "Whether the system supports at least one terminal type " 204 "capable of all operations described in POSIX 1003.2"), 205 #else 206 _INT("posix2_char_term", USER_POSIX2_CHAR_TERM, 0, 207 "Whether the system supports at least one terminal type " 208 "capable of all operations described in POSIX 1003.2"), 209 #endif 210 #ifdef POSIX2_FORT_DEV 211 _INT("posix2_fort_dev", USER_POSIX2_FORT_DEV, 1, 212 "Whether the system supports the FORTRAN Development " 213 "Utilities Option"), 214 #else 215 _INT("posix2_fort_dev", USER_POSIX2_FORT_DEV, 0, 216 "Whether the system supports the FORTRAN Development " 217 "Utilities Option"), 218 #endif 219 #ifdef POSIX2_FORT_RUN 220 _INT("posix2_fort_run", USER_POSIX2_FORT_RUN, 1, 221 "Whether the system supports the FORTRAN Runtime " 222 "Utilities Option"), 223 #else 224 _INT("posix2_fort_run", USER_POSIX2_FORT_RUN, 0, 225 "Whether the system supports the FORTRAN Runtime " 226 "Utilities Option"), 227 #endif 228 #ifdef POSIX2_LOCALEDEF 229 _INT("posix2_localedef", USER_POSIX2_LOCALEDEF, 1, 230 "Whether the system supports the creation of locales"), 231 #else 232 _INT("posix2_localedef", USER_POSIX2_LOCALEDEF, 0, 233 "Whether the system supports the creation of locales"), 234 #endif 235 #ifdef POSIX2_SW_DEV 236 _INT("posix2_sw_dev", USER_POSIX2_SW_DEV, 1, 237 "Whether the system supports the Software Development " 238 "Utilities Option"), 239 #else 240 _INT("posix2_sw_dev", USER_POSIX2_SW_DEV, 0, 241 "Whether the system supports the Software Development " 242 "Utilities Option"), 243 #endif 244 #ifdef POSIX2_UPE 245 _INT("posix2_upe", USER_POSIX2_UPE, 1, 246 "Whether the system supports the User Portability " 247 "Utilities Option"), 248 #else 249 _INT("posix2_upe", USER_POSIX2_UPE, 0, 250 "Whether the system supports the User Portability " 251 "Utilities Option"), 252 #endif 253 _INT("stream_max", USER_STREAM_MAX, FOPEN_MAX, 254 "The minimum maximum number of streams that a process " 255 "may have open at any one time"), 256 _INT("tzname_max", USER_TZNAME_MAX, NAME_MAX, 257 "The minimum maximum number of types supported for the " 258 "name of a timezone"), 259 _INT("atexit_max", USER_ATEXIT_MAX, -1, 260 "The maximum number of functions that may be registered " 261 "with atexit(3)"), 262 #endif /* !lint */ 263 }; 264 #undef _INT 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_adv(NULL, d1->descr_len); 333 if (d2 != NULL) 334 memcpy(d2, d1, d); 335 sz += d; 336 if (node != NULL) 337 break; 338 } 339 *oldlenp = sz; 340 if (sz == 0 && node != NULL) 341 return (ENOENT); 342 return (0); 343 344 } 345 346 /* 347 * none of these nodes are writable 348 */ 349 if (newp != NULL || newlen != 0) 350 return (EPERM); 351 352 node = &sysctl_usermib[0]; 353 for (ni = 0; ni < clen; ni++) 354 if (name[0] == node[ni].sysctl_num) 355 break; 356 if (ni == clen) 357 return (EOPNOTSUPP); 358 359 node = &node[ni]; 360 if (node->sysctl_flags & CTLFLAG_IMMEDIATE) { 361 switch (SYSCTL_TYPE(node->sysctl_flags)) { 362 case CTLTYPE_INT: 363 newp = &node->sysctl_idata; 364 break; 365 case CTLTYPE_QUAD: 366 newp = &node->sysctl_qdata; 367 break; 368 default: 369 return (EINVAL); 370 } 371 } 372 else 373 newp = node->sysctl_data; 374 375 l = MIN(l, node->sysctl_size); 376 if (oldp != NULL) 377 memcpy(oldp, newp, l); 378 *oldlenp = node->sysctl_size; 379 380 return (0); 381 } 382 383 static size_t 384 __cvt_node_out(uint v, const struct sysctlnode *n, void **o, size_t *l) 385 { 386 const void *src = n; 387 size_t sz; 388 389 switch (v) { 390 #if (SYSCTL_VERSION != SYSCTL_VERS_1) 391 #error __cvt_node_out: no support for SYSCTL_VERSION 392 #endif /* (SYSCTL_VERSION != SYSCTL_VERS_1) */ 393 394 case SYSCTL_VERSION: 395 sz = sizeof(struct sysctlnode); 396 break; 397 398 default: 399 sz = 0; 400 break; 401 } 402 403 if (sz > 0 && *o != NULL && *l >= sz) { 404 memcpy(*o, src, sz); 405 *o = sz + (caddr_t)*o; 406 *l -= sz; 407 } 408 409 return(sz); 410 } 411