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 static uma_zone_t kenv_zone; 67 static int kenv_mvallen = KENV_MVALLEN; 68 69 /* pointer to the config-generated static environment */ 70 char *kern_envp; 71 72 /* pointer to the md-static environment */ 73 char *md_envp; 74 static int md_env_len; 75 static int md_env_pos; 76 77 static char *kernenv_next(char *); 78 79 /* dynamic environment variables */ 80 char **kenvp; 81 struct mtx kenv_lock; 82 83 /* 84 * No need to protect this with a mutex since SYSINITS are single threaded. 85 */ 86 bool dynamic_kenv; 87 88 #define KENV_CHECK if (!dynamic_kenv) \ 89 panic("%s: called before SI_SUB_KMEM", __func__) 90 91 static char *getenv_string_buffer(const char *); 92 93 int 94 sys_kenv(td, uap) 95 struct thread *td; 96 struct kenv_args /* { 97 int what; 98 const char *name; 99 char *value; 100 int len; 101 } */ *uap; 102 { 103 char *name, *value, *buffer = NULL; 104 size_t len, done, needed, buflen; 105 int error, i; 106 107 KASSERT(dynamic_kenv, ("kenv: dynamic_kenv = false")); 108 109 error = 0; 110 if (uap->what == KENV_DUMP) { 111 #ifdef MAC 112 error = mac_kenv_check_dump(td->td_ucred); 113 if (error) 114 return (error); 115 #endif 116 done = needed = 0; 117 buflen = uap->len; 118 if (buflen > KENV_SIZE * (KENV_MNAMELEN + kenv_mvallen + 2)) 119 buflen = KENV_SIZE * (KENV_MNAMELEN + 120 kenv_mvallen + 2); 121 if (uap->len > 0 && uap->value != NULL) 122 buffer = malloc(buflen, M_TEMP, M_WAITOK|M_ZERO); 123 mtx_lock(&kenv_lock); 124 for (i = 0; kenvp[i] != NULL; i++) { 125 len = strlen(kenvp[i]) + 1; 126 needed += len; 127 len = min(len, buflen - done); 128 /* 129 * If called with a NULL or insufficiently large 130 * buffer, just keep computing the required size. 131 */ 132 if (uap->value != NULL && buffer != NULL && len > 0) { 133 bcopy(kenvp[i], buffer + done, len); 134 done += len; 135 } 136 } 137 mtx_unlock(&kenv_lock); 138 if (buffer != NULL) { 139 error = copyout(buffer, uap->value, done); 140 free(buffer, M_TEMP); 141 } 142 td->td_retval[0] = ((done == needed) ? 0 : needed); 143 return (error); 144 } 145 146 switch (uap->what) { 147 case KENV_SET: 148 error = priv_check(td, PRIV_KENV_SET); 149 if (error) 150 return (error); 151 break; 152 153 case KENV_UNSET: 154 error = priv_check(td, PRIV_KENV_UNSET); 155 if (error) 156 return (error); 157 break; 158 } 159 160 name = malloc(KENV_MNAMELEN + 1, M_TEMP, M_WAITOK); 161 162 error = copyinstr(uap->name, name, KENV_MNAMELEN + 1, NULL); 163 if (error) 164 goto done; 165 166 switch (uap->what) { 167 case KENV_GET: 168 #ifdef MAC 169 error = mac_kenv_check_get(td->td_ucred, name); 170 if (error) 171 goto done; 172 #endif 173 value = kern_getenv(name); 174 if (value == NULL) { 175 error = ENOENT; 176 goto done; 177 } 178 len = strlen(value) + 1; 179 if (len > uap->len) 180 len = uap->len; 181 error = copyout(value, uap->value, len); 182 freeenv(value); 183 if (error) 184 goto done; 185 td->td_retval[0] = len; 186 break; 187 case KENV_SET: 188 len = uap->len; 189 if (len < 1) { 190 error = EINVAL; 191 goto done; 192 } 193 if (len > kenv_mvallen + 1) 194 len = kenv_mvallen + 1; 195 value = malloc(len, M_TEMP, M_WAITOK); 196 error = copyinstr(uap->value, value, len, NULL); 197 if (error) { 198 free(value, M_TEMP); 199 goto done; 200 } 201 #ifdef MAC 202 error = mac_kenv_check_set(td->td_ucred, name, value); 203 if (error == 0) 204 #endif 205 kern_setenv(name, value); 206 free(value, M_TEMP); 207 break; 208 case KENV_UNSET: 209 #ifdef MAC 210 error = mac_kenv_check_unset(td->td_ucred, name); 211 if (error) 212 goto done; 213 #endif 214 error = kern_unsetenv(name); 215 if (error) 216 error = ENOENT; 217 break; 218 default: 219 error = EINVAL; 220 break; 221 } 222 done: 223 free(name, M_TEMP); 224 return (error); 225 } 226 227 /* 228 * Populate the initial kernel environment. 229 * 230 * This is called very early in MD startup, either to provide a copy of the 231 * environment obtained from a boot loader, or to provide an empty buffer into 232 * which MD code can store an initial environment using kern_setenv() calls. 233 * 234 * kern_envp is set to the static_env generated by config(8). This implements 235 * the env keyword described in config(5). 236 * 237 * If len is non-zero, the caller is providing an empty buffer. The caller will 238 * subsequently use kern_setenv() to add up to len bytes of initial environment 239 * before the dynamic environment is available. 240 * 241 * If len is zero, the caller is providing a pre-loaded buffer containing 242 * environment strings. Additional strings cannot be added until the dynamic 243 * environment is available. The memory pointed to must remain stable at least 244 * until sysinit runs init_dynamic_kenv() and preferably until after SI_SUB_KMEM 245 * is finished so that subr_hints routines may continue to use it until the 246 * environments have been fully merged at the end of the pass. If no initial 247 * environment is available from the boot loader, passing a NULL pointer allows 248 * the static_env to be installed if it is configured. In this case, any call 249 * to kern_setenv() prior to the setup of the dynamic environment will result in 250 * a panic. 251 */ 252 void 253 init_static_kenv(char *buf, size_t len) 254 { 255 char *eval; 256 257 KASSERT(!dynamic_kenv, ("kenv: dynamic_kenv already initialized")); 258 /* 259 * Suitably sized means it must be able to hold at least one empty 260 * variable, otherwise things go belly up if a kern_getenv call is 261 * made without a prior call to kern_setenv as we have a malformed 262 * environment. 263 */ 264 KASSERT(len == 0 || len >= 2, 265 ("kenv: static env must be initialized or suitably sized")); 266 KASSERT(len == 0 || (*buf == '\0' && *(buf + 1) == '\0'), 267 ("kenv: sized buffer must be initially empty")); 268 269 /* 270 * We may be called twice, with the second call needed to relocate 271 * md_envp after enabling paging. md_envp is then garbage if it is 272 * not null and the relocation will move it. Discard it so as to 273 * not crash using its old value in our first call to kern_getenv(). 274 * 275 * The second call gives the same environment as the first except 276 * in silly configurations where the static env disables itself. 277 * 278 * Other env calls don't handle possibly-garbage pointers, so must 279 * not be made between enabling paging and calling here. 280 */ 281 md_envp = NULL; 282 md_env_len = 0; 283 md_env_pos = 0; 284 285 /* 286 * Give the static environment a chance to disable the loader(8) 287 * environment first. This is done with loader_env.disabled=1. 288 * 289 * static_env and static_hints may both be disabled, but in slightly 290 * different ways. For static_env, we just don't setup kern_envp and 291 * it's as if a static env wasn't even provided. For static_hints, 292 * we effectively zero out the buffer to stop the rest of the kernel 293 * from being able to use it. 294 * 295 * We're intentionally setting this up so that static_hints.disabled may 296 * be specified in either the MD env or the static env. This keeps us 297 * consistent in our new world view. 298 * 299 * As a warning, the static environment may not be disabled in any way 300 * if the static environment has disabled the loader environment. 301 */ 302 kern_envp = static_env; 303 eval = kern_getenv("loader_env.disabled"); 304 if (eval == NULL || strcmp(eval, "1") != 0) { 305 md_envp = buf; 306 md_env_len = len; 307 md_env_pos = 0; 308 309 eval = kern_getenv("static_env.disabled"); 310 if (eval != NULL && strcmp(eval, "1") == 0) { 311 kern_envp[0] = '\0'; 312 kern_envp[1] = '\0'; 313 } 314 } 315 eval = kern_getenv("static_hints.disabled"); 316 if (eval != NULL && strcmp(eval, "1") == 0) { 317 static_hints[0] = '\0'; 318 static_hints[1] = '\0'; 319 } 320 } 321 322 static void 323 init_dynamic_kenv_from(char *init_env, int *curpos) 324 { 325 char *cp, *cpnext, *eqpos, *found; 326 size_t len; 327 int i; 328 329 if (init_env && *init_env != '\0') { 330 found = NULL; 331 i = *curpos; 332 for (cp = init_env; cp != NULL; cp = cpnext) { 333 cpnext = kernenv_next(cp); 334 len = strlen(cp) + 1; 335 if (len > KENV_MNAMELEN + 1 + kenv_mvallen + 1) { 336 printf( 337 "WARNING: too long kenv string, ignoring %s\n", 338 cp); 339 goto sanitize; 340 } 341 eqpos = strchr(cp, '='); 342 if (eqpos == NULL) { 343 printf( 344 "WARNING: malformed static env value, ignoring %s\n", 345 cp); 346 goto sanitize; 347 } 348 *eqpos = 0; 349 /* 350 * De-dupe the environment as we go. We don't add the 351 * duplicated assignments because config(8) will flip 352 * the order of the static environment around to make 353 * kernel processing match the order of specification 354 * in the kernel config. 355 */ 356 found = _getenv_dynamic_locked(cp, NULL); 357 *eqpos = '='; 358 if (found != NULL) 359 goto sanitize; 360 if (i > KENV_SIZE) { 361 printf( 362 "WARNING: too many kenv strings, ignoring %s\n", 363 cp); 364 goto sanitize; 365 } 366 367 kenvp[i] = malloc(len, M_KENV, M_WAITOK); 368 strcpy(kenvp[i++], cp); 369 sanitize: 370 explicit_bzero(cp, len - 1); 371 } 372 *curpos = i; 373 } 374 } 375 376 /* 377 * Setup the dynamic kernel environment. 378 */ 379 static void 380 init_dynamic_kenv(void *data __unused) 381 { 382 int dynamic_envpos; 383 int size; 384 385 TUNABLE_INT_FETCH("kenv_mvallen", &kenv_mvallen); 386 size = KENV_MNAMELEN + 1 + kenv_mvallen + 1; 387 388 kenv_zone = uma_zcreate("kenv", size, NULL, NULL, NULL, NULL, 389 UMA_ALIGN_PTR, 0); 390 391 kenvp = malloc((KENV_SIZE + 1) * sizeof(char *), M_KENV, 392 M_WAITOK | M_ZERO); 393 394 dynamic_envpos = 0; 395 init_dynamic_kenv_from(md_envp, &dynamic_envpos); 396 init_dynamic_kenv_from(kern_envp, &dynamic_envpos); 397 kenvp[dynamic_envpos] = NULL; 398 399 mtx_init(&kenv_lock, "kernel environment", NULL, MTX_DEF); 400 dynamic_kenv = true; 401 } 402 SYSINIT(kenv, SI_SUB_KMEM + 1, SI_ORDER_FIRST, init_dynamic_kenv, NULL); 403 404 void 405 freeenv(char *env) 406 { 407 408 if (dynamic_kenv && env != NULL) { 409 explicit_bzero(env, strlen(env)); 410 uma_zfree(kenv_zone, env); 411 } 412 } 413 414 /* 415 * Internal functions for string lookup. 416 */ 417 static char * 418 _getenv_dynamic_locked(const char *name, int *idx) 419 { 420 char *cp; 421 int len, i; 422 423 len = strlen(name); 424 for (cp = kenvp[0], i = 0; cp != NULL; cp = kenvp[++i]) { 425 if ((strncmp(cp, name, len) == 0) && 426 (cp[len] == '=')) { 427 if (idx != NULL) 428 *idx = i; 429 return (cp + len + 1); 430 } 431 } 432 return (NULL); 433 } 434 435 static char * 436 _getenv_dynamic(const char *name, int *idx) 437 { 438 439 mtx_assert(&kenv_lock, MA_OWNED); 440 return (_getenv_dynamic_locked(name, idx)); 441 } 442 443 static char * 444 _getenv_static_from(char *chkenv, const char *name) 445 { 446 char *cp, *ep; 447 int len; 448 449 for (cp = chkenv; cp != NULL; cp = kernenv_next(cp)) { 450 for (ep = cp; (*ep != '=') && (*ep != 0); ep++) 451 ; 452 if (*ep != '=') 453 continue; 454 len = ep - cp; 455 ep++; 456 if (!strncmp(name, cp, len) && name[len] == 0) 457 return (ep); 458 } 459 return (NULL); 460 } 461 462 static char * 463 _getenv_static(const char *name) 464 { 465 char *val; 466 467 val = _getenv_static_from(md_envp, name); 468 if (val != NULL) 469 return (val); 470 val = _getenv_static_from(kern_envp, name); 471 if (val != NULL) 472 return (val); 473 return (NULL); 474 } 475 476 /* 477 * Look up an environment variable by name. 478 * Return a pointer to the string if found. 479 * The pointer has to be freed with freeenv() 480 * after use. 481 */ 482 char * 483 kern_getenv(const char *name) 484 { 485 char *ret; 486 487 if (dynamic_kenv) { 488 ret = getenv_string_buffer(name); 489 if (ret == NULL) { 490 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, 491 "getenv"); 492 } 493 } else 494 ret = _getenv_static(name); 495 return (ret); 496 } 497 498 /* 499 * Test if an environment variable is defined. 500 */ 501 int 502 testenv(const char *name) 503 { 504 char *cp; 505 506 if (dynamic_kenv) { 507 mtx_lock(&kenv_lock); 508 cp = _getenv_dynamic(name, NULL); 509 mtx_unlock(&kenv_lock); 510 } else 511 cp = _getenv_static(name); 512 if (cp != NULL) 513 return (1); 514 return (0); 515 } 516 517 /* 518 * Set an environment variable in the MD-static environment. This cannot 519 * feasibly be done on config(8)-generated static environments as they don't 520 * generally include space for extra variables. 521 */ 522 static int 523 setenv_static(const char *name, const char *value) 524 { 525 int len; 526 527 if (md_env_pos >= md_env_len) 528 return (-1); 529 530 /* Check space for x=y and two nuls */ 531 len = strlen(name) + strlen(value); 532 if (len + 3 < md_env_len - md_env_pos) { 533 len = sprintf(&md_envp[md_env_pos], "%s=%s", name, value); 534 md_env_pos += len+1; 535 md_envp[md_env_pos] = '\0'; 536 return (0); 537 } else 538 return (-1); 539 540 } 541 542 /* 543 * Set an environment variable by name. 544 */ 545 int 546 kern_setenv(const char *name, const char *value) 547 { 548 char *buf, *cp, *oldenv; 549 int namelen, vallen, i; 550 551 if (!dynamic_kenv && md_env_len > 0) 552 return (setenv_static(name, value)); 553 554 KENV_CHECK; 555 556 namelen = strlen(name) + 1; 557 if (namelen > KENV_MNAMELEN + 1) 558 return (-1); 559 vallen = strlen(value) + 1; 560 if (vallen > kenv_mvallen + 1) 561 return (-1); 562 buf = malloc(namelen + vallen, M_KENV, M_WAITOK); 563 sprintf(buf, "%s=%s", name, value); 564 565 mtx_lock(&kenv_lock); 566 cp = _getenv_dynamic(name, &i); 567 if (cp != NULL) { 568 oldenv = kenvp[i]; 569 kenvp[i] = buf; 570 mtx_unlock(&kenv_lock); 571 free(oldenv, M_KENV); 572 } else { 573 /* We add the option if it wasn't found */ 574 for (i = 0; (cp = kenvp[i]) != NULL; i++) 575 ; 576 577 /* Bounds checking */ 578 if (i < 0 || i >= KENV_SIZE) { 579 free(buf, M_KENV); 580 mtx_unlock(&kenv_lock); 581 return (-1); 582 } 583 584 kenvp[i] = buf; 585 kenvp[i + 1] = NULL; 586 mtx_unlock(&kenv_lock); 587 } 588 return (0); 589 } 590 591 /* 592 * Unset an environment variable string. 593 */ 594 int 595 kern_unsetenv(const char *name) 596 { 597 char *cp, *oldenv; 598 int i, j; 599 600 KENV_CHECK; 601 602 mtx_lock(&kenv_lock); 603 cp = _getenv_dynamic(name, &i); 604 if (cp != NULL) { 605 oldenv = kenvp[i]; 606 for (j = i + 1; kenvp[j] != NULL; j++) 607 kenvp[i++] = kenvp[j]; 608 kenvp[i] = NULL; 609 mtx_unlock(&kenv_lock); 610 explicit_bzero(oldenv, strlen(oldenv)); 611 free(oldenv, M_KENV); 612 return (0); 613 } 614 mtx_unlock(&kenv_lock); 615 return (-1); 616 } 617 618 /* 619 * Return a buffer containing the string value from an environment variable 620 */ 621 static char * 622 getenv_string_buffer(const char *name) 623 { 624 char *cp, *ret; 625 int len; 626 627 if (dynamic_kenv) { 628 len = KENV_MNAMELEN + 1 + kenv_mvallen + 1; 629 ret = uma_zalloc(kenv_zone, M_WAITOK | M_ZERO); 630 mtx_lock(&kenv_lock); 631 cp = _getenv_dynamic(name, NULL); 632 if (cp != NULL) 633 strlcpy(ret, cp, len); 634 mtx_unlock(&kenv_lock); 635 if (cp == NULL) { 636 uma_zfree(kenv_zone, ret); 637 ret = NULL; 638 } 639 } else 640 ret = _getenv_static(name); 641 642 return (ret); 643 } 644 645 /* 646 * Return a string value from an environment variable. 647 */ 648 int 649 getenv_string(const char *name, char *data, int size) 650 { 651 char *cp; 652 653 if (dynamic_kenv) { 654 mtx_lock(&kenv_lock); 655 cp = _getenv_dynamic(name, NULL); 656 if (cp != NULL) 657 strlcpy(data, cp, size); 658 mtx_unlock(&kenv_lock); 659 } else { 660 cp = _getenv_static(name); 661 if (cp != NULL) 662 strlcpy(data, cp, size); 663 } 664 return (cp != NULL); 665 } 666 667 /* 668 * Return an array of integers at the given type size and signedness. 669 */ 670 int 671 getenv_array(const char *name, void *pdata, int size, int *psize, 672 int type_size, bool allow_signed) 673 { 674 uint8_t shift; 675 int64_t value; 676 int64_t old; 677 char *buf; 678 char *end; 679 char *ptr; 680 int n; 681 int rc; 682 683 if ((buf = getenv_string_buffer(name)) == NULL) 684 return (0); 685 686 rc = 0; /* assume failure */ 687 /* get maximum number of elements */ 688 size /= type_size; 689 690 n = 0; 691 692 for (ptr = buf; *ptr != 0; ) { 693 694 value = strtoq(ptr, &end, 0); 695 696 /* check if signed numbers are allowed */ 697 if (value < 0 && !allow_signed) 698 goto error; 699 700 /* check for invalid value */ 701 if (ptr == end) 702 goto error; 703 704 /* check for valid suffix */ 705 switch (*end) { 706 case 't': 707 case 'T': 708 shift = 40; 709 end++; 710 break; 711 case 'g': 712 case 'G': 713 shift = 30; 714 end++; 715 break; 716 case 'm': 717 case 'M': 718 shift = 20; 719 end++; 720 break; 721 case 'k': 722 case 'K': 723 shift = 10; 724 end++; 725 break; 726 case ' ': 727 case '\t': 728 case ',': 729 case 0: 730 shift = 0; 731 break; 732 default: 733 /* garbage after numeric value */ 734 goto error; 735 } 736 737 /* skip till next value, if any */ 738 while (*end == '\t' || *end == ',' || *end == ' ') 739 end++; 740 741 /* update pointer */ 742 ptr = end; 743 744 /* apply shift */ 745 old = value; 746 value <<= shift; 747 748 /* overflow check */ 749 if ((value >> shift) != old) 750 goto error; 751 752 /* check for buffer overflow */ 753 if (n >= size) 754 goto error; 755 756 /* store value according to type size */ 757 switch (type_size) { 758 case 1: 759 if (allow_signed) { 760 if (value < SCHAR_MIN || value > SCHAR_MAX) 761 goto error; 762 } else { 763 if (value < 0 || value > UCHAR_MAX) 764 goto error; 765 } 766 ((uint8_t *)pdata)[n] = (uint8_t)value; 767 break; 768 case 2: 769 if (allow_signed) { 770 if (value < SHRT_MIN || value > SHRT_MAX) 771 goto error; 772 } else { 773 if (value < 0 || value > USHRT_MAX) 774 goto error; 775 } 776 ((uint16_t *)pdata)[n] = (uint16_t)value; 777 break; 778 case 4: 779 if (allow_signed) { 780 if (value < INT_MIN || value > INT_MAX) 781 goto error; 782 } else { 783 if (value > UINT_MAX) 784 goto error; 785 } 786 ((uint32_t *)pdata)[n] = (uint32_t)value; 787 break; 788 case 8: 789 ((uint64_t *)pdata)[n] = (uint64_t)value; 790 break; 791 default: 792 goto error; 793 } 794 n++; 795 } 796 *psize = n * type_size; 797 798 if (n != 0) 799 rc = 1; /* success */ 800 error: 801 if (dynamic_kenv) 802 uma_zfree(kenv_zone, buf); 803 return (rc); 804 } 805 806 /* 807 * Return an integer value from an environment variable. 808 */ 809 int 810 getenv_int(const char *name, int *data) 811 { 812 quad_t tmp; 813 int rval; 814 815 rval = getenv_quad(name, &tmp); 816 if (rval) 817 *data = (int) tmp; 818 return (rval); 819 } 820 821 /* 822 * Return an unsigned integer value from an environment variable. 823 */ 824 int 825 getenv_uint(const char *name, unsigned int *data) 826 { 827 quad_t tmp; 828 int rval; 829 830 rval = getenv_quad(name, &tmp); 831 if (rval) 832 *data = (unsigned int) tmp; 833 return (rval); 834 } 835 836 /* 837 * Return an int64_t value from an environment variable. 838 */ 839 int 840 getenv_int64(const char *name, int64_t *data) 841 { 842 quad_t tmp; 843 int64_t rval; 844 845 rval = getenv_quad(name, &tmp); 846 if (rval) 847 *data = (int64_t) tmp; 848 return (rval); 849 } 850 851 /* 852 * Return an uint64_t value from an environment variable. 853 */ 854 int 855 getenv_uint64(const char *name, uint64_t *data) 856 { 857 quad_t tmp; 858 uint64_t rval; 859 860 rval = getenv_quad(name, &tmp); 861 if (rval) 862 *data = (uint64_t) tmp; 863 return (rval); 864 } 865 866 /* 867 * Return a long value from an environment variable. 868 */ 869 int 870 getenv_long(const char *name, long *data) 871 { 872 quad_t tmp; 873 int rval; 874 875 rval = getenv_quad(name, &tmp); 876 if (rval) 877 *data = (long) tmp; 878 return (rval); 879 } 880 881 /* 882 * Return an unsigned long value from an environment variable. 883 */ 884 int 885 getenv_ulong(const char *name, unsigned long *data) 886 { 887 quad_t tmp; 888 int rval; 889 890 rval = getenv_quad(name, &tmp); 891 if (rval) 892 *data = (unsigned long) tmp; 893 return (rval); 894 } 895 896 /* 897 * Return a quad_t value from an environment variable. 898 */ 899 int 900 getenv_quad(const char *name, quad_t *data) 901 { 902 char *value, *vtp; 903 quad_t iv; 904 905 value = getenv_string_buffer(name); 906 if (value == NULL) 907 return (0); 908 iv = strtoq(value, &vtp, 0); 909 if (vtp == value || (vtp[0] != '\0' && vtp[1] != '\0')) { 910 freeenv(value); 911 return (0); 912 } 913 switch (vtp[0]) { 914 case 't': case 'T': 915 iv *= 1024; 916 /* FALLTHROUGH */ 917 case 'g': case 'G': 918 iv *= 1024; 919 /* FALLTHROUGH */ 920 case 'm': case 'M': 921 iv *= 1024; 922 /* FALLTHROUGH */ 923 case 'k': case 'K': 924 iv *= 1024; 925 case '\0': 926 break; 927 default: 928 freeenv(value); 929 return (0); 930 } 931 freeenv(value); 932 *data = iv; 933 return (1); 934 } 935 936 /* 937 * Find the next entry after the one which (cp) falls within, return a 938 * pointer to its start or NULL if there are no more. 939 */ 940 static char * 941 kernenv_next(char *cp) 942 { 943 944 if (cp != NULL) { 945 while (*cp != 0) 946 cp++; 947 cp++; 948 if (*cp == 0) 949 cp = NULL; 950 } 951 return (cp); 952 } 953 954 void 955 tunable_int_init(void *data) 956 { 957 struct tunable_int *d = (struct tunable_int *)data; 958 959 TUNABLE_INT_FETCH(d->path, d->var); 960 } 961 962 void 963 tunable_long_init(void *data) 964 { 965 struct tunable_long *d = (struct tunable_long *)data; 966 967 TUNABLE_LONG_FETCH(d->path, d->var); 968 } 969 970 void 971 tunable_ulong_init(void *data) 972 { 973 struct tunable_ulong *d = (struct tunable_ulong *)data; 974 975 TUNABLE_ULONG_FETCH(d->path, d->var); 976 } 977 978 void 979 tunable_int64_init(void *data) 980 { 981 struct tunable_int64 *d = (struct tunable_int64 *)data; 982 983 TUNABLE_INT64_FETCH(d->path, d->var); 984 } 985 986 void 987 tunable_uint64_init(void *data) 988 { 989 struct tunable_uint64 *d = (struct tunable_uint64 *)data; 990 991 TUNABLE_UINT64_FETCH(d->path, d->var); 992 } 993 994 void 995 tunable_quad_init(void *data) 996 { 997 struct tunable_quad *d = (struct tunable_quad *)data; 998 999 TUNABLE_QUAD_FETCH(d->path, d->var); 1000 } 1001 1002 void 1003 tunable_str_init(void *data) 1004 { 1005 struct tunable_str *d = (struct tunable_str *)data; 1006 1007 TUNABLE_STR_FETCH(d->path, d->var, d->size); 1008 } 1009