1 /*
2 * OS specific functions for UNIX/POSIX systems
3 * Copyright (c) 2005-2009, 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 FILE *f;
254 size_t rc;
255
256 if (TEST_FAIL())
257 return -1;
258
259 f = fopen("/dev/urandom", "rb");
260 if (f == NULL) {
261 printf("Could not open /dev/urandom.\n");
262 return -1;
263 }
264
265 rc = fread(buf, 1, len, f);
266 fclose(f);
267
268 return rc != len ? -1 : 0;
269 }
270
271
os_random(void)272 unsigned long os_random(void)
273 {
274 return random();
275 }
276
277
os_rel2abs_path(const char * rel_path)278 char * os_rel2abs_path(const char *rel_path)
279 {
280 char *buf = NULL, *cwd, *ret;
281 size_t len = 128, cwd_len, rel_len, ret_len;
282 int last_errno;
283
284 if (!rel_path)
285 return NULL;
286
287 if (rel_path[0] == '/')
288 return os_strdup(rel_path);
289
290 for (;;) {
291 buf = os_malloc(len);
292 if (buf == NULL)
293 return NULL;
294 cwd = getcwd(buf, len);
295 if (cwd == NULL) {
296 last_errno = errno;
297 os_free(buf);
298 if (last_errno != ERANGE)
299 return NULL;
300 len *= 2;
301 if (len > 2000)
302 return NULL;
303 } else {
304 buf[len - 1] = '\0';
305 break;
306 }
307 }
308
309 cwd_len = os_strlen(cwd);
310 rel_len = os_strlen(rel_path);
311 ret_len = cwd_len + 1 + rel_len + 1;
312 ret = os_malloc(ret_len);
313 if (ret) {
314 os_memcpy(ret, cwd, cwd_len);
315 ret[cwd_len] = '/';
316 os_memcpy(ret + cwd_len + 1, rel_path, rel_len);
317 ret[ret_len - 1] = '\0';
318 }
319 os_free(buf);
320 return ret;
321 }
322
323
os_program_init(void)324 int os_program_init(void)
325 {
326 #ifdef ANDROID
327 /*
328 * We ignore errors here since errors are normal if we
329 * are already running as non-root.
330 */
331 #ifdef ANDROID_SETGROUPS_OVERRIDE
332 gid_t groups[] = { ANDROID_SETGROUPS_OVERRIDE };
333 #else /* ANDROID_SETGROUPS_OVERRIDE */
334 gid_t groups[] = { AID_INET, AID_WIFI, AID_KEYSTORE };
335 #endif /* ANDROID_SETGROUPS_OVERRIDE */
336 struct __user_cap_header_struct header;
337 struct __user_cap_data_struct cap;
338
339 setgroups(ARRAY_SIZE(groups), groups);
340
341 prctl(PR_SET_KEEPCAPS, 1, 0, 0, 0);
342
343 setgid(AID_WIFI);
344 setuid(AID_WIFI);
345
346 header.version = _LINUX_CAPABILITY_VERSION;
347 header.pid = 0;
348 cap.effective = cap.permitted =
349 (1 << CAP_NET_ADMIN) | (1 << CAP_NET_RAW);
350 cap.inheritable = 0;
351 capset(&header, &cap);
352 #endif /* ANDROID */
353
354 return 0;
355 }
356
357
os_program_deinit(void)358 void os_program_deinit(void)
359 {
360 #ifdef WPA_TRACE
361 struct os_alloc_trace *a;
362 unsigned long total = 0;
363 dl_list_for_each(a, &alloc_list, struct os_alloc_trace, list) {
364 total += a->len;
365 if (a->magic != ALLOC_MAGIC) {
366 wpa_printf(MSG_INFO, "MEMLEAK[%p]: invalid magic 0x%x "
367 "len %lu",
368 a, a->magic, (unsigned long) a->len);
369 continue;
370 }
371 wpa_printf(MSG_INFO, "MEMLEAK[%p]: len %lu",
372 a, (unsigned long) a->len);
373 wpa_trace_dump("memleak", a);
374 }
375 if (total)
376 wpa_printf(MSG_INFO, "MEMLEAK: total %lu bytes",
377 (unsigned long) total);
378 wpa_trace_deinit();
379 #endif /* WPA_TRACE */
380 }
381
382
os_setenv(const char * name,const char * value,int overwrite)383 int os_setenv(const char *name, const char *value, int overwrite)
384 {
385 return setenv(name, value, overwrite);
386 }
387
388
os_unsetenv(const char * name)389 int os_unsetenv(const char *name)
390 {
391 #if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__APPLE__) || \
392 defined(__OpenBSD__)
393 unsetenv(name);
394 return 0;
395 #else
396 return unsetenv(name);
397 #endif
398 }
399
400
os_readfile(const char * name,size_t * len)401 char * os_readfile(const char *name, size_t *len)
402 {
403 FILE *f;
404 char *buf;
405 long pos;
406
407 f = fopen(name, "rb");
408 if (f == NULL)
409 return NULL;
410
411 if (fseek(f, 0, SEEK_END) < 0 || (pos = ftell(f)) < 0) {
412 fclose(f);
413 return NULL;
414 }
415 *len = pos;
416 if (fseek(f, 0, SEEK_SET) < 0) {
417 fclose(f);
418 return NULL;
419 }
420
421 buf = os_malloc(*len);
422 if (buf == NULL) {
423 fclose(f);
424 return NULL;
425 }
426
427 if (fread(buf, 1, *len, f) != *len) {
428 fclose(f);
429 os_free(buf);
430 return NULL;
431 }
432
433 fclose(f);
434
435 return buf;
436 }
437
438
os_file_exists(const char * fname)439 int os_file_exists(const char *fname)
440 {
441 return access(fname, F_OK) == 0;
442 }
443
444
os_fdatasync(FILE * stream)445 int os_fdatasync(FILE *stream)
446 {
447 if (!fflush(stream)) {
448 #ifdef __linux__
449 return fdatasync(fileno(stream));
450 #else /* !__linux__ */
451 #ifdef F_FULLFSYNC
452 /* OS X does not implement fdatasync(). */
453 return fcntl(fileno(stream), F_FULLFSYNC);
454 #else /* F_FULLFSYNC */
455 return fsync(fileno(stream));
456 #endif /* F_FULLFSYNC */
457 #endif /* __linux__ */
458 }
459
460 return -1;
461 }
462
463
464 #ifndef WPA_TRACE
os_zalloc(size_t size)465 void * os_zalloc(size_t size)
466 {
467 return calloc(1, size);
468 }
469 #endif /* WPA_TRACE */
470
471
os_strlcpy(char * dest,const char * src,size_t siz)472 size_t os_strlcpy(char *dest, const char *src, size_t siz)
473 {
474 const char *s = src;
475 size_t left = siz;
476
477 if (left) {
478 /* Copy string up to the maximum size of the dest buffer */
479 while (--left != 0) {
480 if ((*dest++ = *s++) == '\0')
481 break;
482 }
483 }
484
485 if (left == 0) {
486 /* Not enough room for the string; force NUL-termination */
487 if (siz != 0)
488 *dest = '\0';
489 while (*s++)
490 ; /* determine total src string length */
491 }
492
493 return s - src - 1;
494 }
495
496
os_memcmp_const(const void * a,const void * b,size_t len)497 int os_memcmp_const(const void *a, const void *b, size_t len)
498 {
499 const u8 *aa = a;
500 const u8 *bb = b;
501 size_t i;
502 u8 res;
503
504 for (res = 0, i = 0; i < len; i++)
505 res |= aa[i] ^ bb[i];
506
507 return res;
508 }
509
510
511 #ifdef WPA_TRACE
512
513 #if defined(WPA_TRACE_BFD) && defined(CONFIG_TESTING_OPTIONS)
514 char wpa_trace_fail_func[256] = { 0 };
515 unsigned int wpa_trace_fail_after;
516
testing_fail_alloc(void)517 static int testing_fail_alloc(void)
518 {
519 const char *func[WPA_TRACE_LEN];
520 size_t i, res, len;
521 char *pos, *next;
522 int match;
523
524 if (!wpa_trace_fail_after)
525 return 0;
526
527 res = wpa_trace_calling_func(func, WPA_TRACE_LEN);
528 i = 0;
529 if (i < res && os_strcmp(func[i], __func__) == 0)
530 i++;
531 if (i < res && os_strcmp(func[i], "os_malloc") == 0)
532 i++;
533 if (i < res && os_strcmp(func[i], "os_zalloc") == 0)
534 i++;
535 if (i < res && os_strcmp(func[i], "os_calloc") == 0)
536 i++;
537 if (i < res && os_strcmp(func[i], "os_realloc") == 0)
538 i++;
539 if (i < res && os_strcmp(func[i], "os_realloc_array") == 0)
540 i++;
541 if (i < res && os_strcmp(func[i], "os_strdup") == 0)
542 i++;
543
544 pos = wpa_trace_fail_func;
545
546 match = 0;
547 while (i < res) {
548 int allow_skip = 1;
549 int maybe = 0;
550
551 if (*pos == '=') {
552 allow_skip = 0;
553 pos++;
554 } else if (*pos == '?') {
555 maybe = 1;
556 pos++;
557 }
558 next = os_strchr(pos, ';');
559 if (next)
560 len = next - pos;
561 else
562 len = os_strlen(pos);
563 if (os_memcmp(pos, func[i], len) != 0) {
564 if (maybe && next) {
565 pos = next + 1;
566 continue;
567 }
568 if (allow_skip) {
569 i++;
570 continue;
571 }
572 return 0;
573 }
574 if (!next) {
575 match = 1;
576 break;
577 }
578 pos = next + 1;
579 i++;
580 }
581 if (!match)
582 return 0;
583
584 wpa_trace_fail_after--;
585 if (wpa_trace_fail_after == 0) {
586 wpa_printf(MSG_INFO, "TESTING: fail allocation at %s",
587 wpa_trace_fail_func);
588 for (i = 0; i < res; i++)
589 wpa_printf(MSG_INFO, "backtrace[%d] = %s",
590 (int) i, func[i]);
591 return 1;
592 }
593
594 return 0;
595 }
596
597
598 char wpa_trace_test_fail_func[256] = { 0 };
599 unsigned int wpa_trace_test_fail_after;
600
testing_test_fail(void)601 int testing_test_fail(void)
602 {
603 const char *func[WPA_TRACE_LEN];
604 size_t i, res, len;
605 char *pos, *next;
606 int match;
607
608 if (!wpa_trace_test_fail_after)
609 return 0;
610
611 res = wpa_trace_calling_func(func, WPA_TRACE_LEN);
612 i = 0;
613 if (i < res && os_strcmp(func[i], __func__) == 0)
614 i++;
615
616 pos = wpa_trace_test_fail_func;
617
618 match = 0;
619 while (i < res) {
620 int allow_skip = 1;
621 int maybe = 0;
622
623 if (*pos == '=') {
624 allow_skip = 0;
625 pos++;
626 } else if (*pos == '?') {
627 maybe = 1;
628 pos++;
629 }
630 next = os_strchr(pos, ';');
631 if (next)
632 len = next - pos;
633 else
634 len = os_strlen(pos);
635 if (os_memcmp(pos, func[i], len) != 0) {
636 if (maybe && next) {
637 pos = next + 1;
638 continue;
639 }
640 if (allow_skip) {
641 i++;
642 continue;
643 }
644 return 0;
645 }
646 if (!next) {
647 match = 1;
648 break;
649 }
650 pos = next + 1;
651 i++;
652 }
653 if (!match)
654 return 0;
655
656 wpa_trace_test_fail_after--;
657 if (wpa_trace_test_fail_after == 0) {
658 wpa_printf(MSG_INFO, "TESTING: fail at %s",
659 wpa_trace_test_fail_func);
660 for (i = 0; i < res; i++)
661 wpa_printf(MSG_INFO, "backtrace[%d] = %s",
662 (int) i, func[i]);
663 return 1;
664 }
665
666 return 0;
667 }
668
669 #else
670
testing_fail_alloc(void)671 static inline int testing_fail_alloc(void)
672 {
673 return 0;
674 }
675 #endif
676
os_malloc(size_t size)677 void * os_malloc(size_t size)
678 {
679 struct os_alloc_trace *a;
680
681 if (testing_fail_alloc())
682 return NULL;
683
684 a = malloc(sizeof(*a) + size);
685 if (a == NULL)
686 return NULL;
687 a->magic = ALLOC_MAGIC;
688 dl_list_add(&alloc_list, &a->list);
689 a->len = size;
690 wpa_trace_record(a);
691 return a + 1;
692 }
693
694
os_realloc(void * ptr,size_t size)695 void * os_realloc(void *ptr, size_t size)
696 {
697 struct os_alloc_trace *a;
698 size_t copy_len;
699 void *n;
700
701 if (ptr == NULL)
702 return os_malloc(size);
703
704 a = (struct os_alloc_trace *) ptr - 1;
705 if (a->magic != ALLOC_MAGIC) {
706 wpa_printf(MSG_INFO, "REALLOC[%p]: invalid magic 0x%x%s",
707 a, a->magic,
708 a->magic == FREED_MAGIC ? " (already freed)" : "");
709 wpa_trace_show("Invalid os_realloc() call");
710 abort();
711 }
712 n = os_malloc(size);
713 if (n == NULL)
714 return NULL;
715 copy_len = a->len;
716 if (copy_len > size)
717 copy_len = size;
718 os_memcpy(n, a + 1, copy_len);
719 os_free(ptr);
720 return n;
721 }
722
723
os_free(void * ptr)724 void os_free(void *ptr)
725 {
726 struct os_alloc_trace *a;
727
728 if (ptr == NULL)
729 return;
730 a = (struct os_alloc_trace *) ptr - 1;
731 if (a->magic != ALLOC_MAGIC) {
732 wpa_printf(MSG_INFO, "FREE[%p]: invalid magic 0x%x%s",
733 a, a->magic,
734 a->magic == FREED_MAGIC ? " (already freed)" : "");
735 wpa_trace_show("Invalid os_free() call");
736 abort();
737 }
738 dl_list_del(&a->list);
739 a->magic = FREED_MAGIC;
740
741 wpa_trace_check_ref(ptr);
742 free(a);
743 }
744
745
os_zalloc(size_t size)746 void * os_zalloc(size_t size)
747 {
748 void *ptr = os_malloc(size);
749 if (ptr)
750 os_memset(ptr, 0, size);
751 return ptr;
752 }
753
754
os_strdup(const char * s)755 char * os_strdup(const char *s)
756 {
757 size_t len;
758 char *d;
759 len = os_strlen(s);
760 d = os_malloc(len + 1);
761 if (d == NULL)
762 return NULL;
763 os_memcpy(d, s, len);
764 d[len] = '\0';
765 return d;
766 }
767
768 #endif /* WPA_TRACE */
769
770
os_exec(const char * program,const char * arg,int wait_completion)771 int os_exec(const char *program, const char *arg, int wait_completion)
772 {
773 pid_t pid;
774 int pid_status;
775
776 pid = fork();
777 if (pid < 0) {
778 perror("fork");
779 return -1;
780 }
781
782 if (pid == 0) {
783 /* run the external command in the child process */
784 const int MAX_ARG = 30;
785 char *_program, *_arg, *pos;
786 char *argv[MAX_ARG + 1];
787 int i;
788
789 _program = os_strdup(program);
790 _arg = os_strdup(arg);
791
792 argv[0] = _program;
793
794 i = 1;
795 pos = _arg;
796 while (i < MAX_ARG && pos && *pos) {
797 while (*pos == ' ')
798 pos++;
799 if (*pos == '\0')
800 break;
801 argv[i++] = pos;
802 pos = os_strchr(pos, ' ');
803 if (pos)
804 *pos++ = '\0';
805 }
806 argv[i] = NULL;
807
808 execv(program, argv);
809 perror("execv");
810 os_free(_program);
811 os_free(_arg);
812 exit(0);
813 return -1;
814 }
815
816 if (wait_completion) {
817 /* wait for the child process to complete in the parent */
818 waitpid(pid, &pid_status, 0);
819 }
820
821 return 0;
822 }
823