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
35static struct dl_list alloc_list = DL_LIST_HEAD_INIT(alloc_list);
36
37#define ALLOC_MAGIC 0xa84ef1b2
38#define FREED_MAGIC 0x67fd487a
39
40struct 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
50void 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
59int 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
70int 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
128int 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
168int 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>
188static 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
221int 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
244void os_daemonize_terminate(const char *pid_file)
245{
246	if (pid_file)
247		unlink(pid_file);
248}
249
250
251int 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
272unsigned long os_random(void)
273{
274	return random();
275}
276
277
278char * 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
324int 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
358void 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
383int os_setenv(const char *name, const char *value, int overwrite)
384{
385	return setenv(name, value, overwrite);
386}
387
388
389int 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
401char * 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
439int os_file_exists(const char *fname)
440{
441	return access(fname, F_OK) == 0;
442}
443
444
445int 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
465void * os_zalloc(size_t size)
466{
467	return calloc(1, size);
468}
469#endif /* WPA_TRACE */
470
471
472size_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
497int 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)
514char wpa_trace_fail_func[256] = { 0 };
515unsigned int wpa_trace_fail_after;
516
517static 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
598char wpa_trace_test_fail_func[256] = { 0 };
599unsigned int wpa_trace_test_fail_after;
600
601int 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
671static inline int testing_fail_alloc(void)
672{
673	return 0;
674}
675#endif
676
677void * 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
695void * 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
724void 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
746void * 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
755char * 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
771int 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