1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 1998 Michael Smith 5 * 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 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 /* 30 * The unified bootloader passes us a pointer to a preserved copy of 31 * bootstrap/kernel environment variables. We convert them to a 32 * dynamic array of strings later when the VM subsystem is up. 33 * 34 * We make these available through the kenv(2) syscall for userland 35 * and through kern_getenv()/freeenv() kern_setenv() kern_unsetenv() testenv() for 36 * the kernel. 37 */ 38 39 #include <sys/cdefs.h> 40 __FBSDID("$FreeBSD$"); 41 42 #include <sys/param.h> 43 #include <sys/proc.h> 44 #include <sys/queue.h> 45 #include <sys/lock.h> 46 #include <sys/malloc.h> 47 #include <sys/mutex.h> 48 #include <sys/priv.h> 49 #include <sys/kernel.h> 50 #include <sys/systm.h> 51 #include <sys/sysent.h> 52 #include <sys/sysproto.h> 53 #include <sys/libkern.h> 54 #include <sys/kenv.h> 55 #include <sys/limits.h> 56 57 #include <security/mac/mac_framework.h> 58 59 static char *_getenv_dynamic_locked(const char *name, int *idx); 60 static char *_getenv_dynamic(const char *name, int *idx); 61 62 static MALLOC_DEFINE(M_KENV, "kenv", "kernel environment"); 63 64 #define KENV_SIZE 512 /* Maximum number of environment strings */ 65 66 /* pointer to the config-generated static environment */ 67 char *kern_envp; 68 69 /* pointer to the md-static environment */ 70 char *md_envp; 71 static int md_env_len; 72 static int md_env_pos; 73 74 static char *kernenv_next(char *); 75 76 /* dynamic environment variables */ 77 char **kenvp; 78 struct mtx kenv_lock; 79 80 /* 81 * No need to protect this with a mutex since SYSINITS are single threaded. 82 */ 83 bool dynamic_kenv; 84 85 #define KENV_CHECK if (!dynamic_kenv) \ 86 panic("%s: called before SI_SUB_KMEM", __func__) 87 88 int 89 sys_kenv(td, uap) 90 struct thread *td; 91 struct kenv_args /* { 92 int what; 93 const char *name; 94 char *value; 95 int len; 96 } */ *uap; 97 { 98 char *name, *value, *buffer = NULL; 99 size_t len, done, needed, buflen; 100 int error, i; 101 102 KASSERT(dynamic_kenv, ("kenv: dynamic_kenv = false")); 103 104 error = 0; 105 if (uap->what == KENV_DUMP) { 106 #ifdef MAC 107 error = mac_kenv_check_dump(td->td_ucred); 108 if (error) 109 return (error); 110 #endif 111 done = needed = 0; 112 buflen = uap->len; 113 if (buflen > KENV_SIZE * (KENV_MNAMELEN + KENV_MVALLEN + 2)) 114 buflen = KENV_SIZE * (KENV_MNAMELEN + 115 KENV_MVALLEN + 2); 116 if (uap->len > 0 && uap->value != NULL) 117 buffer = malloc(buflen, M_TEMP, M_WAITOK|M_ZERO); 118 mtx_lock(&kenv_lock); 119 for (i = 0; kenvp[i] != NULL; i++) { 120 len = strlen(kenvp[i]) + 1; 121 needed += len; 122 len = min(len, buflen - done); 123 /* 124 * If called with a NULL or insufficiently large 125 * buffer, just keep computing the required size. 126 */ 127 if (uap->value != NULL && buffer != NULL && len > 0) { 128 bcopy(kenvp[i], buffer + done, len); 129 done += len; 130 } 131 } 132 mtx_unlock(&kenv_lock); 133 if (buffer != NULL) { 134 error = copyout(buffer, uap->value, done); 135 free(buffer, M_TEMP); 136 } 137 td->td_retval[0] = ((done == needed) ? 0 : needed); 138 return (error); 139 } 140 141 switch (uap->what) { 142 case KENV_SET: 143 error = priv_check(td, PRIV_KENV_SET); 144 if (error) 145 return (error); 146 break; 147 148 case KENV_UNSET: 149 error = priv_check(td, PRIV_KENV_UNSET); 150 if (error) 151 return (error); 152 break; 153 } 154 155 name = malloc(KENV_MNAMELEN + 1, M_TEMP, M_WAITOK); 156 157 error = copyinstr(uap->name, name, KENV_MNAMELEN + 1, NULL); 158 if (error) 159 goto done; 160 161 switch (uap->what) { 162 case KENV_GET: 163 #ifdef MAC 164 error = mac_kenv_check_get(td->td_ucred, name); 165 if (error) 166 goto done; 167 #endif 168 value = kern_getenv(name); 169 if (value == NULL) { 170 error = ENOENT; 171 goto done; 172 } 173 len = strlen(value) + 1; 174 if (len > uap->len) 175 len = uap->len; 176 error = copyout(value, uap->value, len); 177 freeenv(value); 178 if (error) 179 goto done; 180 td->td_retval[0] = len; 181 break; 182 case KENV_SET: 183 len = uap->len; 184 if (len < 1) { 185 error = EINVAL; 186 goto done; 187 } 188 if (len > KENV_MVALLEN + 1) 189 len = KENV_MVALLEN + 1; 190 value = malloc(len, M_TEMP, M_WAITOK); 191 error = copyinstr(uap->value, value, len, NULL); 192 if (error) { 193 free(value, M_TEMP); 194 goto done; 195 } 196 #ifdef MAC 197 error = mac_kenv_check_set(td->td_ucred, name, value); 198 if (error == 0) 199 #endif 200 kern_setenv(name, value); 201 free(value, M_TEMP); 202 break; 203 case KENV_UNSET: 204 #ifdef MAC 205 error = mac_kenv_check_unset(td->td_ucred, name); 206 if (error) 207 goto done; 208 #endif 209 error = kern_unsetenv(name); 210 if (error) 211 error = ENOENT; 212 break; 213 default: 214 error = EINVAL; 215 break; 216 } 217 done: 218 free(name, M_TEMP); 219 return (error); 220 } 221 222 /* 223 * Populate the initial kernel environment. 224 * 225 * This is called very early in MD startup, either to provide a copy of the 226 * environment obtained from a boot loader, or to provide an empty buffer into 227 * which MD code can store an initial environment using kern_setenv() calls. 228 * 229 * kern_envp is set to the static_env generated by config(8). This implements 230 * the env keyword described in config(5). 231 * 232 * If len is non-zero, the caller is providing an empty buffer. The caller will 233 * subsequently use kern_setenv() to add up to len bytes of initial environment 234 * before the dynamic environment is available. 235 * 236 * If len is zero, the caller is providing a pre-loaded buffer containing 237 * environment strings. Additional strings cannot be added until the dynamic 238 * environment is available. The memory pointed to must remain stable at least 239 * until sysinit runs init_dynamic_kenv() and preferably until after SI_SUB_KMEM 240 * is finished so that subr_hints routines may continue to use it until the 241 * environments have been fully merged at the end of the pass. If no initial 242 * environment is available from the boot loader, passing a NULL pointer allows 243 * the static_env to be installed if it is configured. In this case, any call 244 * to kern_setenv() prior to the setup of the dynamic environment will result in 245 * a panic. 246 */ 247 void 248 init_static_kenv(char *buf, size_t len) 249 { 250 char *eval; 251 252 /* 253 * Give the static environment a chance to disable the loader(8) 254 * environment first. This is done with loader_env.disabled=1. 255 * 256 * static_env and static_hints may both be disabled, but in slightly 257 * different ways. For static_env, we just don't setup kern_envp and 258 * it's as if a static env wasn't even provided. For static_hints, 259 * we effectively zero out the buffer to stop the rest of the kernel 260 * from being able to use it. 261 * 262 * We're intentionally setting this up so that static_hints.disabled may 263 * be specified in either the MD env or the static env. This keeps us 264 * consistent in our new world view. 265 * 266 * As a warning, the static environment may not be disabled in any way 267 * if the static environment has disabled the loader environment. 268 */ 269 kern_envp = static_env; 270 eval = kern_getenv("loader_env.disabled"); 271 if (eval == NULL || strcmp(eval, "1") != 0) { 272 md_envp = buf; 273 md_env_len = len; 274 md_env_pos = 0; 275 276 eval = kern_getenv("static_env.disabled"); 277 if (eval != NULL && strcmp(eval, "1") == 0) 278 *kern_envp = '\0'; 279 } 280 eval = kern_getenv("static_hints.disabled"); 281 if (eval != NULL && strcmp(eval, "1") == 0) 282 *static_hints = '\0'; 283 } 284 285 static void 286 init_dynamic_kenv_from(char *init_env, int *curpos) 287 { 288 char *cp, *cpnext, *eqpos, *found; 289 size_t len; 290 int i; 291 292 if (init_env && *init_env != '\0') { 293 found = NULL; 294 i = *curpos; 295 for (cp = init_env; cp != NULL; cp = cpnext) { 296 cpnext = kernenv_next(cp); 297 len = strlen(cp) + 1; 298 if (len > KENV_MNAMELEN + 1 + KENV_MVALLEN + 1) { 299 printf( 300 "WARNING: too long kenv string, ignoring %s\n", 301 cp); 302 goto sanitize; 303 } 304 eqpos = strchr(cp, '='); 305 if (eqpos == NULL) { 306 printf( 307 "WARNING: malformed static env value, ignoring %s\n", 308 cp); 309 goto sanitize; 310 } 311 *eqpos = 0; 312 /* 313 * De-dupe the environment as we go. We don't add the 314 * duplicated assignments because config(8) will flip 315 * the order of the static environment around to make 316 * kernel processing match the order of specification 317 * in the kernel config. 318 */ 319 found = _getenv_dynamic_locked(cp, NULL); 320 *eqpos = '='; 321 if (found != NULL) 322 goto sanitize; 323 if (i > KENV_SIZE) { 324 printf( 325 "WARNING: too many kenv strings, ignoring %s\n", 326 cp); 327 goto sanitize; 328 } 329 330 kenvp[i] = malloc(len, M_KENV, M_WAITOK); 331 strcpy(kenvp[i++], cp); 332 sanitize: 333 explicit_bzero(cp, len - 1); 334 } 335 *curpos = i; 336 } 337 } 338 339 /* 340 * Setup the dynamic kernel environment. 341 */ 342 static void 343 init_dynamic_kenv(void *data __unused) 344 { 345 int dynamic_envpos; 346 347 kenvp = malloc((KENV_SIZE + 1) * sizeof(char *), M_KENV, 348 M_WAITOK | M_ZERO); 349 350 dynamic_envpos = 0; 351 init_dynamic_kenv_from(md_envp, &dynamic_envpos); 352 init_dynamic_kenv_from(kern_envp, &dynamic_envpos); 353 kenvp[dynamic_envpos] = NULL; 354 355 mtx_init(&kenv_lock, "kernel environment", NULL, MTX_DEF); 356 dynamic_kenv = true; 357 } 358 SYSINIT(kenv, SI_SUB_KMEM + 1, SI_ORDER_FIRST, init_dynamic_kenv, NULL); 359 360 void 361 freeenv(char *env) 362 { 363 364 if (dynamic_kenv && env != NULL) { 365 explicit_bzero(env, strlen(env)); 366 free(env, M_KENV); 367 } 368 } 369 370 /* 371 * Internal functions for string lookup. 372 */ 373 static char * 374 _getenv_dynamic_locked(const char *name, int *idx) 375 { 376 char *cp; 377 int len, i; 378 379 len = strlen(name); 380 for (cp = kenvp[0], i = 0; cp != NULL; cp = kenvp[++i]) { 381 if ((strncmp(cp, name, len) == 0) && 382 (cp[len] == '=')) { 383 if (idx != NULL) 384 *idx = i; 385 return (cp + len + 1); 386 } 387 } 388 return (NULL); 389 } 390 391 static char * 392 _getenv_dynamic(const char *name, int *idx) 393 { 394 395 mtx_assert(&kenv_lock, MA_OWNED); 396 return (_getenv_dynamic_locked(name, idx)); 397 } 398 399 static char * 400 _getenv_static_from(char *chkenv, const char *name) 401 { 402 char *cp, *ep; 403 int len; 404 405 for (cp = chkenv; cp != NULL; cp = kernenv_next(cp)) { 406 for (ep = cp; (*ep != '=') && (*ep != 0); ep++) 407 ; 408 if (*ep != '=') 409 continue; 410 len = ep - cp; 411 ep++; 412 if (!strncmp(name, cp, len) && name[len] == 0) 413 return (ep); 414 } 415 return (NULL); 416 } 417 418 static char * 419 _getenv_static(const char *name) 420 { 421 char *val; 422 423 val = _getenv_static_from(md_envp, name); 424 if (val != NULL) 425 return (val); 426 val = _getenv_static_from(kern_envp, name); 427 if (val != NULL) 428 return (val); 429 return (NULL); 430 } 431 432 /* 433 * Look up an environment variable by name. 434 * Return a pointer to the string if found. 435 * The pointer has to be freed with freeenv() 436 * after use. 437 */ 438 char * 439 kern_getenv(const char *name) 440 { 441 char buf[KENV_MNAMELEN + 1 + KENV_MVALLEN + 1]; 442 char *ret; 443 444 if (dynamic_kenv) { 445 if (getenv_string(name, buf, sizeof(buf))) { 446 ret = strdup(buf, M_KENV); 447 } else { 448 ret = NULL; 449 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, 450 "getenv"); 451 } 452 } else 453 ret = _getenv_static(name); 454 return (ret); 455 } 456 457 /* 458 * Test if an environment variable is defined. 459 */ 460 int 461 testenv(const char *name) 462 { 463 char *cp; 464 465 if (dynamic_kenv) { 466 mtx_lock(&kenv_lock); 467 cp = _getenv_dynamic(name, NULL); 468 mtx_unlock(&kenv_lock); 469 } else 470 cp = _getenv_static(name); 471 if (cp != NULL) 472 return (1); 473 return (0); 474 } 475 476 /* 477 * Set an environment variable in the MD-static environment. This cannot 478 * feasibly be done on config(8)-generated static environments as they don't 479 * generally include space for extra variables. 480 */ 481 static int 482 setenv_static(const char *name, const char *value) 483 { 484 int len; 485 486 if (md_env_pos >= md_env_len) 487 return (-1); 488 489 /* Check space for x=y and two nuls */ 490 len = strlen(name) + strlen(value); 491 if (len + 3 < md_env_len - md_env_pos) { 492 len = sprintf(&md_envp[md_env_pos], "%s=%s", name, value); 493 md_env_pos += len+1; 494 md_envp[md_env_pos] = '\0'; 495 return (0); 496 } else 497 return (-1); 498 499 } 500 501 /* 502 * Set an environment variable by name. 503 */ 504 int 505 kern_setenv(const char *name, const char *value) 506 { 507 char *buf, *cp, *oldenv; 508 int namelen, vallen, i; 509 510 if (!dynamic_kenv && md_env_len > 0) 511 return (setenv_static(name, value)); 512 513 KENV_CHECK; 514 515 namelen = strlen(name) + 1; 516 if (namelen > KENV_MNAMELEN + 1) 517 return (-1); 518 vallen = strlen(value) + 1; 519 if (vallen > KENV_MVALLEN + 1) 520 return (-1); 521 buf = malloc(namelen + vallen, M_KENV, M_WAITOK); 522 sprintf(buf, "%s=%s", name, value); 523 524 mtx_lock(&kenv_lock); 525 cp = _getenv_dynamic(name, &i); 526 if (cp != NULL) { 527 oldenv = kenvp[i]; 528 kenvp[i] = buf; 529 mtx_unlock(&kenv_lock); 530 free(oldenv, M_KENV); 531 } else { 532 /* We add the option if it wasn't found */ 533 for (i = 0; (cp = kenvp[i]) != NULL; i++) 534 ; 535 536 /* Bounds checking */ 537 if (i < 0 || i >= KENV_SIZE) { 538 free(buf, M_KENV); 539 mtx_unlock(&kenv_lock); 540 return (-1); 541 } 542 543 kenvp[i] = buf; 544 kenvp[i + 1] = NULL; 545 mtx_unlock(&kenv_lock); 546 } 547 return (0); 548 } 549 550 /* 551 * Unset an environment variable string. 552 */ 553 int 554 kern_unsetenv(const char *name) 555 { 556 char *cp, *oldenv; 557 int i, j; 558 559 KENV_CHECK; 560 561 mtx_lock(&kenv_lock); 562 cp = _getenv_dynamic(name, &i); 563 if (cp != NULL) { 564 oldenv = kenvp[i]; 565 for (j = i + 1; kenvp[j] != NULL; j++) 566 kenvp[i++] = kenvp[j]; 567 kenvp[i] = NULL; 568 mtx_unlock(&kenv_lock); 569 explicit_bzero(oldenv, strlen(oldenv)); 570 free(oldenv, M_KENV); 571 return (0); 572 } 573 mtx_unlock(&kenv_lock); 574 return (-1); 575 } 576 577 /* 578 * Return a string value from an environment variable. 579 */ 580 int 581 getenv_string(const char *name, char *data, int size) 582 { 583 char *cp; 584 585 if (dynamic_kenv) { 586 mtx_lock(&kenv_lock); 587 cp = _getenv_dynamic(name, NULL); 588 if (cp != NULL) 589 strlcpy(data, cp, size); 590 mtx_unlock(&kenv_lock); 591 } else { 592 cp = _getenv_static(name); 593 if (cp != NULL) 594 strlcpy(data, cp, size); 595 } 596 return (cp != NULL); 597 } 598 599 /* 600 * Return an array of integers at the given type size and signedness. 601 */ 602 int 603 getenv_array(const char *name, void *pdata, int size, int *psize, 604 int type_size, bool allow_signed) 605 { 606 char buf[KENV_MNAMELEN + 1 + KENV_MVALLEN + 1]; 607 uint8_t shift; 608 int64_t value; 609 int64_t old; 610 char *end; 611 char *ptr; 612 int n; 613 614 if (getenv_string(name, buf, sizeof(buf)) == 0) 615 return (0); 616 617 /* get maximum number of elements */ 618 size /= type_size; 619 620 n = 0; 621 622 for (ptr = buf; *ptr != 0; ) { 623 624 value = strtoq(ptr, &end, 0); 625 626 /* check if signed numbers are allowed */ 627 if (value < 0 && !allow_signed) 628 goto error; 629 630 /* check for invalid value */ 631 if (ptr == end) 632 goto error; 633 634 /* check for valid suffix */ 635 switch (*end) { 636 case 't': 637 case 'T': 638 shift = 40; 639 end++; 640 break; 641 case 'g': 642 case 'G': 643 shift = 30; 644 end++; 645 break; 646 case 'm': 647 case 'M': 648 shift = 20; 649 end++; 650 break; 651 case 'k': 652 case 'K': 653 shift = 10; 654 end++; 655 break; 656 case ' ': 657 case '\t': 658 case ',': 659 case 0: 660 shift = 0; 661 break; 662 default: 663 /* garbage after numeric value */ 664 goto error; 665 } 666 667 /* skip till next value, if any */ 668 while (*end == '\t' || *end == ',' || *end == ' ') 669 end++; 670 671 /* update pointer */ 672 ptr = end; 673 674 /* apply shift */ 675 old = value; 676 value <<= shift; 677 678 /* overflow check */ 679 if ((value >> shift) != old) 680 goto error; 681 682 /* check for buffer overflow */ 683 if (n >= size) 684 goto error; 685 686 /* store value according to type size */ 687 switch (type_size) { 688 case 1: 689 if (allow_signed) { 690 if (value < SCHAR_MIN || value > SCHAR_MAX) 691 goto error; 692 } else { 693 if (value < 0 || value > UCHAR_MAX) 694 goto error; 695 } 696 ((uint8_t *)pdata)[n] = (uint8_t)value; 697 break; 698 case 2: 699 if (allow_signed) { 700 if (value < SHRT_MIN || value > SHRT_MAX) 701 goto error; 702 } else { 703 if (value < 0 || value > USHRT_MAX) 704 goto error; 705 } 706 ((uint16_t *)pdata)[n] = (uint16_t)value; 707 break; 708 case 4: 709 if (allow_signed) { 710 if (value < INT_MIN || value > INT_MAX) 711 goto error; 712 } else { 713 if (value > UINT_MAX) 714 goto error; 715 } 716 ((uint32_t *)pdata)[n] = (uint32_t)value; 717 break; 718 case 8: 719 ((uint64_t *)pdata)[n] = (uint64_t)value; 720 break; 721 default: 722 goto error; 723 } 724 n++; 725 } 726 *psize = n * type_size; 727 728 if (n != 0) 729 return (1); /* success */ 730 error: 731 return (0); /* failure */ 732 } 733 734 /* 735 * Return an integer value from an environment variable. 736 */ 737 int 738 getenv_int(const char *name, int *data) 739 { 740 quad_t tmp; 741 int rval; 742 743 rval = getenv_quad(name, &tmp); 744 if (rval) 745 *data = (int) tmp; 746 return (rval); 747 } 748 749 /* 750 * Return an unsigned integer value from an environment variable. 751 */ 752 int 753 getenv_uint(const char *name, unsigned int *data) 754 { 755 quad_t tmp; 756 int rval; 757 758 rval = getenv_quad(name, &tmp); 759 if (rval) 760 *data = (unsigned int) tmp; 761 return (rval); 762 } 763 764 /* 765 * Return an int64_t value from an environment variable. 766 */ 767 int 768 getenv_int64(const char *name, int64_t *data) 769 { 770 quad_t tmp; 771 int64_t rval; 772 773 rval = getenv_quad(name, &tmp); 774 if (rval) 775 *data = (int64_t) tmp; 776 return (rval); 777 } 778 779 /* 780 * Return an uint64_t value from an environment variable. 781 */ 782 int 783 getenv_uint64(const char *name, uint64_t *data) 784 { 785 quad_t tmp; 786 uint64_t rval; 787 788 rval = getenv_quad(name, &tmp); 789 if (rval) 790 *data = (uint64_t) tmp; 791 return (rval); 792 } 793 794 /* 795 * Return a long value from an environment variable. 796 */ 797 int 798 getenv_long(const char *name, long *data) 799 { 800 quad_t tmp; 801 int rval; 802 803 rval = getenv_quad(name, &tmp); 804 if (rval) 805 *data = (long) tmp; 806 return (rval); 807 } 808 809 /* 810 * Return an unsigned long value from an environment variable. 811 */ 812 int 813 getenv_ulong(const char *name, unsigned long *data) 814 { 815 quad_t tmp; 816 int rval; 817 818 rval = getenv_quad(name, &tmp); 819 if (rval) 820 *data = (unsigned long) tmp; 821 return (rval); 822 } 823 824 /* 825 * Return a quad_t value from an environment variable. 826 */ 827 int 828 getenv_quad(const char *name, quad_t *data) 829 { 830 char value[KENV_MNAMELEN + 1 + KENV_MVALLEN + 1]; 831 char *vtp; 832 quad_t iv; 833 834 if (!getenv_string(name, value, sizeof(value))) 835 return (0); 836 iv = strtoq(value, &vtp, 0); 837 if (vtp == value || (vtp[0] != '\0' && vtp[1] != '\0')) 838 return (0); 839 switch (vtp[0]) { 840 case 't': case 'T': 841 iv *= 1024; 842 case 'g': case 'G': 843 iv *= 1024; 844 case 'm': case 'M': 845 iv *= 1024; 846 case 'k': case 'K': 847 iv *= 1024; 848 case '\0': 849 break; 850 default: 851 return (0); 852 } 853 *data = iv; 854 return (1); 855 } 856 857 /* 858 * Find the next entry after the one which (cp) falls within, return a 859 * pointer to its start or NULL if there are no more. 860 */ 861 static char * 862 kernenv_next(char *cp) 863 { 864 865 if (cp != NULL) { 866 while (*cp != 0) 867 cp++; 868 cp++; 869 if (*cp == 0) 870 cp = NULL; 871 } 872 return (cp); 873 } 874 875 void 876 tunable_int_init(void *data) 877 { 878 struct tunable_int *d = (struct tunable_int *)data; 879 880 TUNABLE_INT_FETCH(d->path, d->var); 881 } 882 883 void 884 tunable_long_init(void *data) 885 { 886 struct tunable_long *d = (struct tunable_long *)data; 887 888 TUNABLE_LONG_FETCH(d->path, d->var); 889 } 890 891 void 892 tunable_ulong_init(void *data) 893 { 894 struct tunable_ulong *d = (struct tunable_ulong *)data; 895 896 TUNABLE_ULONG_FETCH(d->path, d->var); 897 } 898 899 void 900 tunable_int64_init(void *data) 901 { 902 struct tunable_int64 *d = (struct tunable_int64 *)data; 903 904 TUNABLE_INT64_FETCH(d->path, d->var); 905 } 906 907 void 908 tunable_uint64_init(void *data) 909 { 910 struct tunable_uint64 *d = (struct tunable_uint64 *)data; 911 912 TUNABLE_UINT64_FETCH(d->path, d->var); 913 } 914 915 void 916 tunable_quad_init(void *data) 917 { 918 struct tunable_quad *d = (struct tunable_quad *)data; 919 920 TUNABLE_QUAD_FETCH(d->path, d->var); 921 } 922 923 void 924 tunable_str_init(void *data) 925 { 926 struct tunable_str *d = (struct tunable_str *)data; 927 928 TUNABLE_STR_FETCH(d->path, d->var, d->size); 929 } 930