1 /*
2 * OS specific functions for UNIX/POSIX systems
3 * Copyright (c) 2005-2019, Jouni Malinen <j@w1.fi>
4 *
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
7 */
8
9 #include "includes.h"
10
11 #include <time.h>
12 #include <sys/wait.h>
13
14 #ifdef ANDROID
15 #include <sys/capability.h>
16 #include <sys/prctl.h>
17 #include <private/android_filesystem_config.h>
18 #endif /* ANDROID */
19
20 #ifdef __MACH__
21 #include <CoreServices/CoreServices.h>
22 #include <mach/mach.h>
23 #include <mach/mach_time.h>
24 #endif /* __MACH__ */
25
26 #include "os.h"
27 #include "common.h"
28
29 #ifdef WPA_TRACE
30
31 #include "wpa_debug.h"
32 #include "trace.h"
33 #include "list.h"
34
35 static struct dl_list alloc_list = DL_LIST_HEAD_INIT(alloc_list);
36
37 #define ALLOC_MAGIC 0xa84ef1b2
38 #define FREED_MAGIC 0x67fd487a
39
40 struct os_alloc_trace {
41 unsigned int magic;
42 struct dl_list list;
43 size_t len;
44 WPA_TRACE_INFO
45 } __attribute__((aligned(16)));
46
47 #endif /* WPA_TRACE */
48
49
os_sleep(os_time_t sec,os_time_t usec)50 void os_sleep(os_time_t sec, os_time_t usec)
51 {
52 if (sec)
53 sleep(sec);
54 if (usec)
55 usleep(usec);
56 }
57
58
os_get_time(struct os_time * t)59 int os_get_time(struct os_time *t)
60 {
61 int res;
62 struct timeval tv;
63 res = gettimeofday(&tv, NULL);
64 t->sec = tv.tv_sec;
65 t->usec = tv.tv_usec;
66 return res;
67 }
68
69
os_get_reltime(struct os_reltime * t)70 int os_get_reltime(struct os_reltime *t)
71 {
72 #ifndef __MACH__
73 #if defined(CLOCK_BOOTTIME)
74 static clockid_t clock_id = CLOCK_BOOTTIME;
75 #elif defined(CLOCK_MONOTONIC)
76 static clockid_t clock_id = CLOCK_MONOTONIC;
77 #else
78 static clockid_t clock_id = CLOCK_REALTIME;
79 #endif
80 struct timespec ts;
81 int res;
82
83 if (TEST_FAIL())
84 return -1;
85
86 while (1) {
87 res = clock_gettime(clock_id, &ts);
88 if (res == 0) {
89 t->sec = ts.tv_sec;
90 t->usec = ts.tv_nsec / 1000;
91 return 0;
92 }
93 switch (clock_id) {
94 #ifdef CLOCK_BOOTTIME
95 case CLOCK_BOOTTIME:
96 clock_id = CLOCK_MONOTONIC;
97 break;
98 #endif
99 #ifdef CLOCK_MONOTONIC
100 case CLOCK_MONOTONIC:
101 clock_id = CLOCK_REALTIME;
102 break;
103 #endif
104 case CLOCK_REALTIME:
105 return -1;
106 }
107 }
108 #else /* __MACH__ */
109 uint64_t abstime, nano;
110 static mach_timebase_info_data_t info = { 0, 0 };
111
112 if (!info.denom) {
113 if (mach_timebase_info(&info) != KERN_SUCCESS)
114 return -1;
115 }
116
117 abstime = mach_absolute_time();
118 nano = (abstime * info.numer) / info.denom;
119
120 t->sec = nano / NSEC_PER_SEC;
121 t->usec = (nano - (((uint64_t) t->sec) * NSEC_PER_SEC)) / NSEC_PER_USEC;
122
123 return 0;
124 #endif /* __MACH__ */
125 }
126
127
os_mktime(int year,int month,int day,int hour,int min,int sec,os_time_t * t)128 int os_mktime(int year, int month, int day, int hour, int min, int sec,
129 os_time_t *t)
130 {
131 struct tm tm, *tm1;
132 time_t t_local, t1, t2;
133 os_time_t tz_offset;
134
135 if (year < 1970 || month < 1 || month > 12 || day < 1 || day > 31 ||
136 hour < 0 || hour > 23 || min < 0 || min > 59 || sec < 0 ||
137 sec > 60)
138 return -1;
139
140 memset(&tm, 0, sizeof(tm));
141 tm.tm_year = year - 1900;
142 tm.tm_mon = month - 1;
143 tm.tm_mday = day;
144 tm.tm_hour = hour;
145 tm.tm_min = min;
146 tm.tm_sec = sec;
147
148 t_local = mktime(&tm);
149
150 /* figure out offset to UTC */
151 tm1 = localtime(&t_local);
152 if (tm1) {
153 t1 = mktime(tm1);
154 tm1 = gmtime(&t_local);
155 if (tm1) {
156 t2 = mktime(tm1);
157 tz_offset = t2 - t1;
158 } else
159 tz_offset = 0;
160 } else
161 tz_offset = 0;
162
163 *t = (os_time_t) t_local - tz_offset;
164 return 0;
165 }
166
167
os_gmtime(os_time_t t,struct os_tm * tm)168 int os_gmtime(os_time_t t, struct os_tm *tm)
169 {
170 struct tm *tm2;
171 time_t t2 = t;
172
173 tm2 = gmtime(&t2);
174 if (tm2 == NULL)
175 return -1;
176 tm->sec = tm2->tm_sec;
177 tm->min = tm2->tm_min;
178 tm->hour = tm2->tm_hour;
179 tm->day = tm2->tm_mday;
180 tm->month = tm2->tm_mon + 1;
181 tm->year = tm2->tm_year + 1900;
182 return 0;
183 }
184
185
186 #ifdef __APPLE__
187 #include <fcntl.h>
os_daemon(int nochdir,int noclose)188 static int os_daemon(int nochdir, int noclose)
189 {
190 int devnull;
191
192 if (chdir("/") < 0)
193 return -1;
194
195 devnull = open("/dev/null", O_RDWR);
196 if (devnull < 0)
197 return -1;
198
199 if (dup2(devnull, STDIN_FILENO) < 0) {
200 close(devnull);
201 return -1;
202 }
203
204 if (dup2(devnull, STDOUT_FILENO) < 0) {
205 close(devnull);
206 return -1;
207 }
208
209 if (dup2(devnull, STDERR_FILENO) < 0) {
210 close(devnull);
211 return -1;
212 }
213
214 return 0;
215 }
216 #else /* __APPLE__ */
217 #define os_daemon daemon
218 #endif /* __APPLE__ */
219
220
os_daemonize(const char * pid_file)221 int os_daemonize(const char *pid_file)
222 {
223 #if defined(__uClinux__) || defined(__sun__)
224 return -1;
225 #else /* defined(__uClinux__) || defined(__sun__) */
226 if (os_daemon(0, 0)) {
227 perror("daemon");
228 return -1;
229 }
230
231 if (pid_file) {
232 FILE *f = fopen(pid_file, "w");
233 if (f) {
234 fprintf(f, "%u\n", getpid());
235 fclose(f);
236 }
237 }
238
239 return -0;
240 #endif /* defined(__uClinux__) || defined(__sun__) */
241 }
242
243
os_daemonize_terminate(const char * pid_file)244 void os_daemonize_terminate(const char *pid_file)
245 {
246 if (pid_file)
247 unlink(pid_file);
248 }
249
250
os_get_random(unsigned char * buf,size_t len)251 int os_get_random(unsigned char *buf, size_t len)
252 {
253 #if defined(TEST_FUZZ) || defined(CONFIG_TEST_RANDOM)
254 size_t i;
255
256 for (i = 0; i < len; i++)
257 buf[i] = i & 0xff;
258 return 0;
259 #else /* TEST_FUZZ */
260 FILE *f;
261 size_t rc;
262
263 if (TEST_FAIL())
264 return -1;
265
266 f = fopen("/dev/urandom", "rb");
267 if (f == NULL) {
268 printf("Could not open /dev/urandom.\n");
269 return -1;
270 }
271
272 rc = fread(buf, 1, len, f);
273 fclose(f);
274
275 return rc != len ? -1 : 0;
276 #endif /* TEST_FUZZ */
277 }
278
279
os_random(void)280 unsigned long os_random(void)
281 {
282 return random();
283 }
284
285
os_rel2abs_path(const char * rel_path)286 char * os_rel2abs_path(const char *rel_path)
287 {
288 char *buf = NULL, *cwd, *ret;
289 size_t len = 128, cwd_len, rel_len, ret_len;
290 int last_errno;
291
292 if (!rel_path)
293 return NULL;
294
295 if (rel_path[0] == '/')
296 return os_strdup(rel_path);
297
298 for (;;) {
299 buf = os_malloc(len);
300 if (buf == NULL)
301 return NULL;
302 cwd = getcwd(buf, len);
303 if (cwd == NULL) {
304 last_errno = errno;
305 os_free(buf);
306 if (last_errno != ERANGE)
307 return NULL;
308 len *= 2;
309 if (len > 2000)
310 return NULL;
311 } else {
312 buf[len - 1] = '\0';
313 break;
314 }
315 }
316
317 cwd_len = os_strlen(cwd);
318 rel_len = os_strlen(rel_path);
319 ret_len = cwd_len + 1 + rel_len + 1;
320 ret = os_malloc(ret_len);
321 if (ret) {
322 os_memcpy(ret, cwd, cwd_len);
323 ret[cwd_len] = '/';
324 os_memcpy(ret + cwd_len + 1, rel_path, rel_len);
325 ret[ret_len - 1] = '\0';
326 }
327 os_free(buf);
328 return ret;
329 }
330
331
os_program_init(void)332 int os_program_init(void)
333 {
334 #ifdef ANDROID
335 /*
336 * We ignore errors here since errors are normal if we
337 * are already running as non-root.
338 */
339 #ifdef ANDROID_SETGROUPS_OVERRIDE
340 gid_t groups[] = { ANDROID_SETGROUPS_OVERRIDE };
341 #else /* ANDROID_SETGROUPS_OVERRIDE */
342 gid_t groups[] = { AID_INET, AID_WIFI, AID_KEYSTORE };
343 #endif /* ANDROID_SETGROUPS_OVERRIDE */
344 struct __user_cap_header_struct header;
345 struct __user_cap_data_struct cap;
346
347 setgroups(ARRAY_SIZE(groups), groups);
348
349 prctl(PR_SET_KEEPCAPS, 1, 0, 0, 0);
350
351 setgid(AID_WIFI);
352 setuid(AID_WIFI);
353
354 header.version = _LINUX_CAPABILITY_VERSION;
355 header.pid = 0;
356 cap.effective = cap.permitted =
357 (1 << CAP_NET_ADMIN) | (1 << CAP_NET_RAW);
358 cap.inheritable = 0;
359 capset(&header, &cap);
360 #endif /* ANDROID */
361
362 return 0;
363 }
364
365
os_program_deinit(void)366 void os_program_deinit(void)
367 {
368 #ifdef WPA_TRACE
369 struct os_alloc_trace *a;
370 unsigned long total = 0;
371 dl_list_for_each(a, &alloc_list, struct os_alloc_trace, list) {
372 total += a->len;
373 if (a->magic != ALLOC_MAGIC) {
374 wpa_printf(MSG_INFO, "MEMLEAK[%p]: invalid magic 0x%x "
375 "len %lu",
376 a, a->magic, (unsigned long) a->len);
377 continue;
378 }
379 wpa_printf(MSG_INFO, "MEMLEAK[%p]: len %lu",
380 a, (unsigned long) a->len);
381 wpa_trace_dump("memleak", a);
382 }
383 if (total)
384 wpa_printf(MSG_INFO, "MEMLEAK: total %lu bytes",
385 (unsigned long) total);
386 wpa_trace_deinit();
387 #endif /* WPA_TRACE */
388 }
389
390
os_setenv(const char * name,const char * value,int overwrite)391 int os_setenv(const char *name, const char *value, int overwrite)
392 {
393 return setenv(name, value, overwrite);
394 }
395
396
os_unsetenv(const char * name)397 int os_unsetenv(const char *name)
398 {
399 #if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__APPLE__) || \
400 defined(__OpenBSD__)
401 unsetenv(name);
402 return 0;
403 #else
404 return unsetenv(name);
405 #endif
406 }
407
408
os_readfile(const char * name,size_t * len)409 char * os_readfile(const char *name, size_t *len)
410 {
411 FILE *f;
412 char *buf;
413 long pos;
414
415 f = fopen(name, "rb");
416 if (f == NULL)
417 return NULL;
418
419 if (fseek(f, 0, SEEK_END) < 0 || (pos = ftell(f)) < 0) {
420 fclose(f);
421 return NULL;
422 }
423 *len = pos;
424 if (fseek(f, 0, SEEK_SET) < 0) {
425 fclose(f);
426 return NULL;
427 }
428
429 buf = os_malloc(*len);
430 if (buf == NULL) {
431 fclose(f);
432 return NULL;
433 }
434
435 if (fread(buf, 1, *len, f) != *len) {
436 fclose(f);
437 os_free(buf);
438 return NULL;
439 }
440
441 fclose(f);
442
443 return buf;
444 }
445
446
os_file_exists(const char * fname)447 int os_file_exists(const char *fname)
448 {
449 return access(fname, F_OK) == 0;
450 }
451
452
os_fdatasync(FILE * stream)453 int os_fdatasync(FILE *stream)
454 {
455 if (!fflush(stream)) {
456 #ifdef __linux__
457 return fdatasync(fileno(stream));
458 #else /* !__linux__ */
459 #ifdef F_FULLFSYNC
460 /* OS X does not implement fdatasync(). */
461 return fcntl(fileno(stream), F_FULLFSYNC);
462 #else /* F_FULLFSYNC */
463 return fsync(fileno(stream));
464 #endif /* F_FULLFSYNC */
465 #endif /* __linux__ */
466 }
467
468 return -1;
469 }
470
471
472 #ifndef WPA_TRACE
os_zalloc(size_t size)473 void * os_zalloc(size_t size)
474 {
475 return calloc(1, size);
476 }
477 #endif /* WPA_TRACE */
478
479
os_strlcpy(char * dest,const char * src,size_t siz)480 size_t os_strlcpy(char *dest, const char *src, size_t siz)
481 {
482 const char *s = src;
483 size_t left = siz;
484
485 if (left) {
486 /* Copy string up to the maximum size of the dest buffer */
487 while (--left != 0) {
488 if ((*dest++ = *s++) == '\0')
489 break;
490 }
491 }
492
493 if (left == 0) {
494 /* Not enough room for the string; force NUL-termination */
495 if (siz != 0)
496 *dest = '\0';
497 while (*s++)
498 ; /* determine total src string length */
499 }
500
501 return s - src - 1;
502 }
503
504
os_memcmp_const(const void * a,const void * b,size_t len)505 int os_memcmp_const(const void *a, const void *b, size_t len)
506 {
507 const u8 *aa = a;
508 const u8 *bb = b;
509 size_t i;
510 u8 res;
511
512 for (res = 0, i = 0; i < len; i++)
513 res |= aa[i] ^ bb[i];
514
515 return res;
516 }
517
518
os_memdup(const void * src,size_t len)519 void * os_memdup(const void *src, size_t len)
520 {
521 void *r = os_malloc(len);
522
523 if (r && src)
524 os_memcpy(r, src, len);
525 return r;
526 }
527
528
529 #ifdef WPA_TRACE
530
531 #if defined(WPA_TRACE_BFD) && defined(CONFIG_TESTING_OPTIONS)
532 char wpa_trace_fail_func[256] = { 0 };
533 unsigned int wpa_trace_fail_after;
534
testing_fail_alloc(void)535 static int testing_fail_alloc(void)
536 {
537 const char *func[WPA_TRACE_LEN];
538 size_t i, res, len;
539 char *pos, *next;
540 int match;
541
542 if (!wpa_trace_fail_after)
543 return 0;
544
545 res = wpa_trace_calling_func(func, WPA_TRACE_LEN);
546 i = 0;
547 if (i < res && os_strcmp(func[i], __func__) == 0)
548 i++;
549 if (i < res && os_strcmp(func[i], "os_malloc") == 0)
550 i++;
551 if (i < res && os_strcmp(func[i], "os_zalloc") == 0)
552 i++;
553 if (i < res && os_strcmp(func[i], "os_calloc") == 0)
554 i++;
555 if (i < res && os_strcmp(func[i], "os_realloc") == 0)
556 i++;
557 if (i < res && os_strcmp(func[i], "os_realloc_array") == 0)
558 i++;
559 if (i < res && os_strcmp(func[i], "os_strdup") == 0)
560 i++;
561 if (i < res && os_strcmp(func[i], "os_memdup") == 0)
562 i++;
563
564 pos = wpa_trace_fail_func;
565
566 match = 0;
567 while (i < res) {
568 int allow_skip = 1;
569 int maybe = 0;
570
571 if (*pos == '=') {
572 allow_skip = 0;
573 pos++;
574 } else if (*pos == '?') {
575 maybe = 1;
576 pos++;
577 }
578 next = os_strchr(pos, ';');
579 if (next)
580 len = next - pos;
581 else
582 len = os_strlen(pos);
583 if (os_memcmp(pos, func[i], len) != 0) {
584 if (maybe && next) {
585 pos = next + 1;
586 continue;
587 }
588 if (allow_skip) {
589 i++;
590 continue;
591 }
592 return 0;
593 }
594 if (!next) {
595 match = 1;
596 break;
597 }
598 pos = next + 1;
599 i++;
600 }
601 if (!match)
602 return 0;
603
604 wpa_trace_fail_after--;
605 if (wpa_trace_fail_after == 0) {
606 wpa_printf(MSG_INFO, "TESTING: fail allocation at %s",
607 wpa_trace_fail_func);
608 for (i = 0; i < res; i++)
609 wpa_printf(MSG_INFO, "backtrace[%d] = %s",
610 (int) i, func[i]);
611 return 1;
612 }
613
614 return 0;
615 }
616
617
618 char wpa_trace_test_fail_func[256] = { 0 };
619 unsigned int wpa_trace_test_fail_after;
620
testing_test_fail(void)621 int testing_test_fail(void)
622 {
623 const char *func[WPA_TRACE_LEN];
624 size_t i, res, len;
625 char *pos, *next;
626 int match;
627
628 if (!wpa_trace_test_fail_after)
629 return 0;
630
631 res = wpa_trace_calling_func(func, WPA_TRACE_LEN);
632 i = 0;
633 if (i < res && os_strcmp(func[i], __func__) == 0)
634 i++;
635
636 pos = wpa_trace_test_fail_func;
637
638 match = 0;
639 while (i < res) {
640 int allow_skip = 1;
641 int maybe = 0;
642
643 if (*pos == '=') {
644 allow_skip = 0;
645 pos++;
646 } else if (*pos == '?') {
647 maybe = 1;
648 pos++;
649 }
650 next = os_strchr(pos, ';');
651 if (next)
652 len = next - pos;
653 else
654 len = os_strlen(pos);
655 if (os_memcmp(pos, func[i], len) != 0) {
656 if (maybe && next) {
657 pos = next + 1;
658 continue;
659 }
660 if (allow_skip) {
661 i++;
662 continue;
663 }
664 return 0;
665 }
666 if (!next) {
667 match = 1;
668 break;
669 }
670 pos = next + 1;
671 i++;
672 }
673 if (!match)
674 return 0;
675
676 wpa_trace_test_fail_after--;
677 if (wpa_trace_test_fail_after == 0) {
678 wpa_printf(MSG_INFO, "TESTING: fail at %s",
679 wpa_trace_test_fail_func);
680 for (i = 0; i < res; i++)
681 wpa_printf(MSG_INFO, "backtrace[%d] = %s",
682 (int) i, func[i]);
683 return 1;
684 }
685
686 return 0;
687 }
688
689 #else
690
testing_fail_alloc(void)691 static inline int testing_fail_alloc(void)
692 {
693 return 0;
694 }
695 #endif
696
os_malloc(size_t size)697 void * os_malloc(size_t size)
698 {
699 struct os_alloc_trace *a;
700
701 if (testing_fail_alloc())
702 return NULL;
703
704 a = malloc(sizeof(*a) + size);
705 if (a == NULL)
706 return NULL;
707 a->magic = ALLOC_MAGIC;
708 dl_list_add(&alloc_list, &a->list);
709 a->len = size;
710 wpa_trace_record(a);
711 return a + 1;
712 }
713
714
os_realloc(void * ptr,size_t size)715 void * os_realloc(void *ptr, size_t size)
716 {
717 struct os_alloc_trace *a;
718 size_t copy_len;
719 void *n;
720
721 if (ptr == NULL)
722 return os_malloc(size);
723
724 a = (struct os_alloc_trace *) ptr - 1;
725 if (a->magic != ALLOC_MAGIC) {
726 wpa_printf(MSG_INFO, "REALLOC[%p]: invalid magic 0x%x%s",
727 a, a->magic,
728 a->magic == FREED_MAGIC ? " (already freed)" : "");
729 wpa_trace_show("Invalid os_realloc() call");
730 abort();
731 }
732 n = os_malloc(size);
733 if (n == NULL)
734 return NULL;
735 copy_len = a->len;
736 if (copy_len > size)
737 copy_len = size;
738 os_memcpy(n, a + 1, copy_len);
739 os_free(ptr);
740 return n;
741 }
742
743
os_free(void * ptr)744 void os_free(void *ptr)
745 {
746 struct os_alloc_trace *a;
747
748 if (ptr == NULL)
749 return;
750 a = (struct os_alloc_trace *) ptr - 1;
751 if (a->magic != ALLOC_MAGIC) {
752 wpa_printf(MSG_INFO, "FREE[%p]: invalid magic 0x%x%s",
753 a, a->magic,
754 a->magic == FREED_MAGIC ? " (already freed)" : "");
755 wpa_trace_show("Invalid os_free() call");
756 abort();
757 }
758 dl_list_del(&a->list);
759 a->magic = FREED_MAGIC;
760
761 wpa_trace_check_ref(ptr);
762 free(a);
763 }
764
765
os_zalloc(size_t size)766 void * os_zalloc(size_t size)
767 {
768 void *ptr = os_malloc(size);
769 if (ptr)
770 os_memset(ptr, 0, size);
771 return ptr;
772 }
773
774
os_strdup(const char * s)775 char * os_strdup(const char *s)
776 {
777 size_t len;
778 char *d;
779 len = os_strlen(s);
780 d = os_malloc(len + 1);
781 if (d == NULL)
782 return NULL;
783 os_memcpy(d, s, len);
784 d[len] = '\0';
785 return d;
786 }
787
788 #endif /* WPA_TRACE */
789
790
os_exec(const char * program,const char * arg,int wait_completion)791 int os_exec(const char *program, const char *arg, int wait_completion)
792 {
793 pid_t pid;
794 int pid_status;
795
796 pid = fork();
797 if (pid < 0) {
798 perror("fork");
799 return -1;
800 }
801
802 if (pid == 0) {
803 /* run the external command in the child process */
804 const int MAX_ARG = 30;
805 char *_program, *_arg, *pos;
806 char *argv[MAX_ARG + 1];
807 int i;
808
809 _program = os_strdup(program);
810 _arg = os_strdup(arg);
811
812 argv[0] = _program;
813
814 i = 1;
815 pos = _arg;
816 while (i < MAX_ARG && pos && *pos) {
817 while (*pos == ' ')
818 pos++;
819 if (*pos == '\0')
820 break;
821 argv[i++] = pos;
822 pos = os_strchr(pos, ' ');
823 if (pos)
824 *pos++ = '\0';
825 }
826 argv[i] = NULL;
827
828 execv(program, argv);
829 perror("execv");
830 os_free(_program);
831 os_free(_arg);
832 exit(0);
833 return -1;
834 }
835
836 if (wait_completion) {
837 /* wait for the child process to complete in the parent */
838 waitpid(pid, &pid_status, 0);
839 }
840
841 return 0;
842 }
843