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