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 KASSERT(!dynamic_kenv, ("kenv: dynamic_kenv already initialized")); 253 254 /* 255 * We may be called twice, with the second call needed to relocate 256 * md_envp after enabling paging. md_envp is then garbage if it is 257 * not null and the relocation will move it. Discard it so as to 258 * not crash using its old value in our first call to kern_getenv(). 259 * 260 * The second call gives the same environment as the first except 261 * in silly configurations where the static env disables itself. 262 * 263 * Other env calls don't handle possibly-garbage pointers, so must 264 * not be made between enabling paging and calling here. 265 */ 266 md_envp = NULL; 267 md_env_len = 0; 268 md_env_pos = 0; 269 270 /* 271 * Give the static environment a chance to disable the loader(8) 272 * environment first. This is done with loader_env.disabled=1. 273 * 274 * static_env and static_hints may both be disabled, but in slightly 275 * different ways. For static_env, we just don't setup kern_envp and 276 * it's as if a static env wasn't even provided. For static_hints, 277 * we effectively zero out the buffer to stop the rest of the kernel 278 * from being able to use it. 279 * 280 * We're intentionally setting this up so that static_hints.disabled may 281 * be specified in either the MD env or the static env. This keeps us 282 * consistent in our new world view. 283 * 284 * As a warning, the static environment may not be disabled in any way 285 * if the static environment has disabled the loader environment. 286 */ 287 kern_envp = static_env; 288 eval = kern_getenv("loader_env.disabled"); 289 if (eval == NULL || strcmp(eval, "1") != 0) { 290 md_envp = buf; 291 md_env_len = len; 292 md_env_pos = 0; 293 294 eval = kern_getenv("static_env.disabled"); 295 if (eval != NULL && strcmp(eval, "1") == 0) { 296 kern_envp[0] = '\0'; 297 kern_envp[1] = '\0'; 298 } 299 } 300 eval = kern_getenv("static_hints.disabled"); 301 if (eval != NULL && strcmp(eval, "1") == 0) { 302 static_hints[0] = '\0'; 303 static_hints[1] = '\0'; 304 } 305 } 306 307 static void 308 init_dynamic_kenv_from(char *init_env, int *curpos) 309 { 310 char *cp, *cpnext, *eqpos, *found; 311 size_t len; 312 int i; 313 314 if (init_env && *init_env != '\0') { 315 found = NULL; 316 i = *curpos; 317 for (cp = init_env; cp != NULL; cp = cpnext) { 318 cpnext = kernenv_next(cp); 319 len = strlen(cp) + 1; 320 if (len > KENV_MNAMELEN + 1 + KENV_MVALLEN + 1) { 321 printf( 322 "WARNING: too long kenv string, ignoring %s\n", 323 cp); 324 goto sanitize; 325 } 326 eqpos = strchr(cp, '='); 327 if (eqpos == NULL) { 328 printf( 329 "WARNING: malformed static env value, ignoring %s\n", 330 cp); 331 goto sanitize; 332 } 333 *eqpos = 0; 334 /* 335 * De-dupe the environment as we go. We don't add the 336 * duplicated assignments because config(8) will flip 337 * the order of the static environment around to make 338 * kernel processing match the order of specification 339 * in the kernel config. 340 */ 341 found = _getenv_dynamic_locked(cp, NULL); 342 *eqpos = '='; 343 if (found != NULL) 344 goto sanitize; 345 if (i > KENV_SIZE) { 346 printf( 347 "WARNING: too many kenv strings, ignoring %s\n", 348 cp); 349 goto sanitize; 350 } 351 352 kenvp[i] = malloc(len, M_KENV, M_WAITOK); 353 strcpy(kenvp[i++], cp); 354 sanitize: 355 explicit_bzero(cp, len - 1); 356 } 357 *curpos = i; 358 } 359 } 360 361 /* 362 * Setup the dynamic kernel environment. 363 */ 364 static void 365 init_dynamic_kenv(void *data __unused) 366 { 367 int dynamic_envpos; 368 369 kenvp = malloc((KENV_SIZE + 1) * sizeof(char *), M_KENV, 370 M_WAITOK | M_ZERO); 371 372 dynamic_envpos = 0; 373 init_dynamic_kenv_from(md_envp, &dynamic_envpos); 374 init_dynamic_kenv_from(kern_envp, &dynamic_envpos); 375 kenvp[dynamic_envpos] = NULL; 376 377 mtx_init(&kenv_lock, "kernel environment", NULL, MTX_DEF); 378 dynamic_kenv = true; 379 } 380 SYSINIT(kenv, SI_SUB_KMEM + 1, SI_ORDER_FIRST, init_dynamic_kenv, NULL); 381 382 void 383 freeenv(char *env) 384 { 385 386 if (dynamic_kenv && env != NULL) { 387 explicit_bzero(env, strlen(env)); 388 free(env, M_KENV); 389 } 390 } 391 392 /* 393 * Internal functions for string lookup. 394 */ 395 static char * 396 _getenv_dynamic_locked(const char *name, int *idx) 397 { 398 char *cp; 399 int len, i; 400 401 len = strlen(name); 402 for (cp = kenvp[0], i = 0; cp != NULL; cp = kenvp[++i]) { 403 if ((strncmp(cp, name, len) == 0) && 404 (cp[len] == '=')) { 405 if (idx != NULL) 406 *idx = i; 407 return (cp + len + 1); 408 } 409 } 410 return (NULL); 411 } 412 413 static char * 414 _getenv_dynamic(const char *name, int *idx) 415 { 416 417 mtx_assert(&kenv_lock, MA_OWNED); 418 return (_getenv_dynamic_locked(name, idx)); 419 } 420 421 static char * 422 _getenv_static_from(char *chkenv, const char *name) 423 { 424 char *cp, *ep; 425 int len; 426 427 for (cp = chkenv; cp != NULL; cp = kernenv_next(cp)) { 428 for (ep = cp; (*ep != '=') && (*ep != 0); ep++) 429 ; 430 if (*ep != '=') 431 continue; 432 len = ep - cp; 433 ep++; 434 if (!strncmp(name, cp, len) && name[len] == 0) 435 return (ep); 436 } 437 return (NULL); 438 } 439 440 static char * 441 _getenv_static(const char *name) 442 { 443 char *val; 444 445 val = _getenv_static_from(md_envp, name); 446 if (val != NULL) 447 return (val); 448 val = _getenv_static_from(kern_envp, name); 449 if (val != NULL) 450 return (val); 451 return (NULL); 452 } 453 454 /* 455 * Look up an environment variable by name. 456 * Return a pointer to the string if found. 457 * The pointer has to be freed with freeenv() 458 * after use. 459 */ 460 char * 461 kern_getenv(const char *name) 462 { 463 char buf[KENV_MNAMELEN + 1 + KENV_MVALLEN + 1]; 464 char *ret; 465 466 if (dynamic_kenv) { 467 if (getenv_string(name, buf, sizeof(buf))) { 468 ret = strdup(buf, M_KENV); 469 } else { 470 ret = NULL; 471 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, 472 "getenv"); 473 } 474 } else 475 ret = _getenv_static(name); 476 return (ret); 477 } 478 479 /* 480 * Test if an environment variable is defined. 481 */ 482 int 483 testenv(const char *name) 484 { 485 char *cp; 486 487 if (dynamic_kenv) { 488 mtx_lock(&kenv_lock); 489 cp = _getenv_dynamic(name, NULL); 490 mtx_unlock(&kenv_lock); 491 } else 492 cp = _getenv_static(name); 493 if (cp != NULL) 494 return (1); 495 return (0); 496 } 497 498 /* 499 * Set an environment variable in the MD-static environment. This cannot 500 * feasibly be done on config(8)-generated static environments as they don't 501 * generally include space for extra variables. 502 */ 503 static int 504 setenv_static(const char *name, const char *value) 505 { 506 int len; 507 508 if (md_env_pos >= md_env_len) 509 return (-1); 510 511 /* Check space for x=y and two nuls */ 512 len = strlen(name) + strlen(value); 513 if (len + 3 < md_env_len - md_env_pos) { 514 len = sprintf(&md_envp[md_env_pos], "%s=%s", name, value); 515 md_env_pos += len+1; 516 md_envp[md_env_pos] = '\0'; 517 return (0); 518 } else 519 return (-1); 520 521 } 522 523 /* 524 * Set an environment variable by name. 525 */ 526 int 527 kern_setenv(const char *name, const char *value) 528 { 529 char *buf, *cp, *oldenv; 530 int namelen, vallen, i; 531 532 if (!dynamic_kenv && md_env_len > 0) 533 return (setenv_static(name, value)); 534 535 KENV_CHECK; 536 537 namelen = strlen(name) + 1; 538 if (namelen > KENV_MNAMELEN + 1) 539 return (-1); 540 vallen = strlen(value) + 1; 541 if (vallen > KENV_MVALLEN + 1) 542 return (-1); 543 buf = malloc(namelen + vallen, M_KENV, M_WAITOK); 544 sprintf(buf, "%s=%s", name, value); 545 546 mtx_lock(&kenv_lock); 547 cp = _getenv_dynamic(name, &i); 548 if (cp != NULL) { 549 oldenv = kenvp[i]; 550 kenvp[i] = buf; 551 mtx_unlock(&kenv_lock); 552 free(oldenv, M_KENV); 553 } else { 554 /* We add the option if it wasn't found */ 555 for (i = 0; (cp = kenvp[i]) != NULL; i++) 556 ; 557 558 /* Bounds checking */ 559 if (i < 0 || i >= KENV_SIZE) { 560 free(buf, M_KENV); 561 mtx_unlock(&kenv_lock); 562 return (-1); 563 } 564 565 kenvp[i] = buf; 566 kenvp[i + 1] = NULL; 567 mtx_unlock(&kenv_lock); 568 } 569 return (0); 570 } 571 572 /* 573 * Unset an environment variable string. 574 */ 575 int 576 kern_unsetenv(const char *name) 577 { 578 char *cp, *oldenv; 579 int i, j; 580 581 KENV_CHECK; 582 583 mtx_lock(&kenv_lock); 584 cp = _getenv_dynamic(name, &i); 585 if (cp != NULL) { 586 oldenv = kenvp[i]; 587 for (j = i + 1; kenvp[j] != NULL; j++) 588 kenvp[i++] = kenvp[j]; 589 kenvp[i] = NULL; 590 mtx_unlock(&kenv_lock); 591 explicit_bzero(oldenv, strlen(oldenv)); 592 free(oldenv, M_KENV); 593 return (0); 594 } 595 mtx_unlock(&kenv_lock); 596 return (-1); 597 } 598 599 /* 600 * Return a string value from an environment variable. 601 */ 602 int 603 getenv_string(const char *name, char *data, int size) 604 { 605 char *cp; 606 607 if (dynamic_kenv) { 608 mtx_lock(&kenv_lock); 609 cp = _getenv_dynamic(name, NULL); 610 if (cp != NULL) 611 strlcpy(data, cp, size); 612 mtx_unlock(&kenv_lock); 613 } else { 614 cp = _getenv_static(name); 615 if (cp != NULL) 616 strlcpy(data, cp, size); 617 } 618 return (cp != NULL); 619 } 620 621 /* 622 * Return an array of integers at the given type size and signedness. 623 */ 624 int 625 getenv_array(const char *name, void *pdata, int size, int *psize, 626 int type_size, bool allow_signed) 627 { 628 char buf[KENV_MNAMELEN + 1 + KENV_MVALLEN + 1]; 629 uint8_t shift; 630 int64_t value; 631 int64_t old; 632 char *end; 633 char *ptr; 634 int n; 635 636 if (getenv_string(name, buf, sizeof(buf)) == 0) 637 return (0); 638 639 /* get maximum number of elements */ 640 size /= type_size; 641 642 n = 0; 643 644 for (ptr = buf; *ptr != 0; ) { 645 646 value = strtoq(ptr, &end, 0); 647 648 /* check if signed numbers are allowed */ 649 if (value < 0 && !allow_signed) 650 goto error; 651 652 /* check for invalid value */ 653 if (ptr == end) 654 goto error; 655 656 /* check for valid suffix */ 657 switch (*end) { 658 case 't': 659 case 'T': 660 shift = 40; 661 end++; 662 break; 663 case 'g': 664 case 'G': 665 shift = 30; 666 end++; 667 break; 668 case 'm': 669 case 'M': 670 shift = 20; 671 end++; 672 break; 673 case 'k': 674 case 'K': 675 shift = 10; 676 end++; 677 break; 678 case ' ': 679 case '\t': 680 case ',': 681 case 0: 682 shift = 0; 683 break; 684 default: 685 /* garbage after numeric value */ 686 goto error; 687 } 688 689 /* skip till next value, if any */ 690 while (*end == '\t' || *end == ',' || *end == ' ') 691 end++; 692 693 /* update pointer */ 694 ptr = end; 695 696 /* apply shift */ 697 old = value; 698 value <<= shift; 699 700 /* overflow check */ 701 if ((value >> shift) != old) 702 goto error; 703 704 /* check for buffer overflow */ 705 if (n >= size) 706 goto error; 707 708 /* store value according to type size */ 709 switch (type_size) { 710 case 1: 711 if (allow_signed) { 712 if (value < SCHAR_MIN || value > SCHAR_MAX) 713 goto error; 714 } else { 715 if (value < 0 || value > UCHAR_MAX) 716 goto error; 717 } 718 ((uint8_t *)pdata)[n] = (uint8_t)value; 719 break; 720 case 2: 721 if (allow_signed) { 722 if (value < SHRT_MIN || value > SHRT_MAX) 723 goto error; 724 } else { 725 if (value < 0 || value > USHRT_MAX) 726 goto error; 727 } 728 ((uint16_t *)pdata)[n] = (uint16_t)value; 729 break; 730 case 4: 731 if (allow_signed) { 732 if (value < INT_MIN || value > INT_MAX) 733 goto error; 734 } else { 735 if (value > UINT_MAX) 736 goto error; 737 } 738 ((uint32_t *)pdata)[n] = (uint32_t)value; 739 break; 740 case 8: 741 ((uint64_t *)pdata)[n] = (uint64_t)value; 742 break; 743 default: 744 goto error; 745 } 746 n++; 747 } 748 *psize = n * type_size; 749 750 if (n != 0) 751 return (1); /* success */ 752 error: 753 return (0); /* failure */ 754 } 755 756 /* 757 * Return an integer value from an environment variable. 758 */ 759 int 760 getenv_int(const char *name, int *data) 761 { 762 quad_t tmp; 763 int rval; 764 765 rval = getenv_quad(name, &tmp); 766 if (rval) 767 *data = (int) tmp; 768 return (rval); 769 } 770 771 /* 772 * Return an unsigned integer value from an environment variable. 773 */ 774 int 775 getenv_uint(const char *name, unsigned int *data) 776 { 777 quad_t tmp; 778 int rval; 779 780 rval = getenv_quad(name, &tmp); 781 if (rval) 782 *data = (unsigned int) tmp; 783 return (rval); 784 } 785 786 /* 787 * Return an int64_t value from an environment variable. 788 */ 789 int 790 getenv_int64(const char *name, int64_t *data) 791 { 792 quad_t tmp; 793 int64_t rval; 794 795 rval = getenv_quad(name, &tmp); 796 if (rval) 797 *data = (int64_t) tmp; 798 return (rval); 799 } 800 801 /* 802 * Return an uint64_t value from an environment variable. 803 */ 804 int 805 getenv_uint64(const char *name, uint64_t *data) 806 { 807 quad_t tmp; 808 uint64_t rval; 809 810 rval = getenv_quad(name, &tmp); 811 if (rval) 812 *data = (uint64_t) tmp; 813 return (rval); 814 } 815 816 /* 817 * Return a long value from an environment variable. 818 */ 819 int 820 getenv_long(const char *name, long *data) 821 { 822 quad_t tmp; 823 int rval; 824 825 rval = getenv_quad(name, &tmp); 826 if (rval) 827 *data = (long) tmp; 828 return (rval); 829 } 830 831 /* 832 * Return an unsigned long value from an environment variable. 833 */ 834 int 835 getenv_ulong(const char *name, unsigned long *data) 836 { 837 quad_t tmp; 838 int rval; 839 840 rval = getenv_quad(name, &tmp); 841 if (rval) 842 *data = (unsigned long) tmp; 843 return (rval); 844 } 845 846 /* 847 * Return a quad_t value from an environment variable. 848 */ 849 int 850 getenv_quad(const char *name, quad_t *data) 851 { 852 char value[KENV_MNAMELEN + 1 + KENV_MVALLEN + 1]; 853 char *vtp; 854 quad_t iv; 855 856 if (!getenv_string(name, value, sizeof(value))) 857 return (0); 858 iv = strtoq(value, &vtp, 0); 859 if (vtp == value || (vtp[0] != '\0' && vtp[1] != '\0')) 860 return (0); 861 switch (vtp[0]) { 862 case 't': case 'T': 863 iv *= 1024; 864 /* FALLTHROUGH */ 865 case 'g': case 'G': 866 iv *= 1024; 867 /* FALLTHROUGH */ 868 case 'm': case 'M': 869 iv *= 1024; 870 /* FALLTHROUGH */ 871 case 'k': case 'K': 872 iv *= 1024; 873 case '\0': 874 break; 875 default: 876 return (0); 877 } 878 *data = iv; 879 return (1); 880 } 881 882 /* 883 * Find the next entry after the one which (cp) falls within, return a 884 * pointer to its start or NULL if there are no more. 885 */ 886 static char * 887 kernenv_next(char *cp) 888 { 889 890 if (cp != NULL) { 891 while (*cp != 0) 892 cp++; 893 cp++; 894 if (*cp == 0) 895 cp = NULL; 896 } 897 return (cp); 898 } 899 900 void 901 tunable_int_init(void *data) 902 { 903 struct tunable_int *d = (struct tunable_int *)data; 904 905 TUNABLE_INT_FETCH(d->path, d->var); 906 } 907 908 void 909 tunable_long_init(void *data) 910 { 911 struct tunable_long *d = (struct tunable_long *)data; 912 913 TUNABLE_LONG_FETCH(d->path, d->var); 914 } 915 916 void 917 tunable_ulong_init(void *data) 918 { 919 struct tunable_ulong *d = (struct tunable_ulong *)data; 920 921 TUNABLE_ULONG_FETCH(d->path, d->var); 922 } 923 924 void 925 tunable_int64_init(void *data) 926 { 927 struct tunable_int64 *d = (struct tunable_int64 *)data; 928 929 TUNABLE_INT64_FETCH(d->path, d->var); 930 } 931 932 void 933 tunable_uint64_init(void *data) 934 { 935 struct tunable_uint64 *d = (struct tunable_uint64 *)data; 936 937 TUNABLE_UINT64_FETCH(d->path, d->var); 938 } 939 940 void 941 tunable_quad_init(void *data) 942 { 943 struct tunable_quad *d = (struct tunable_quad *)data; 944 945 TUNABLE_QUAD_FETCH(d->path, d->var); 946 } 947 948 void 949 tunable_str_init(void *data) 950 { 951 struct tunable_str *d = (struct tunable_str *)data; 952 953 TUNABLE_STR_FETCH(d->path, d->var, d->size); 954 } 955