Source

asterisk / utils.c

Full commit
  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 1999 - 2005, Digium, Inc.
 *
 * See http://www.asterisk.org for more information about
 * the Asterisk project. Please do not directly contact
 * any of the maintainers of this project for assistance;
 * the project provides a web site, mailing lists and IRC
 * channels for your use.
 *
 * This program is free software, distributed under the terms of
 * the GNU General Public License Version 2. See the LICENSE file
 * at the top of the source tree.
 */

/*! \file
 *
 * \brief Utility functions
 *
 * \note These are important for portability and security,
 * so please use them in favour of other routines.
 * Please consult the CODING GUIDELINES for more information.
 */

#include <ctype.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <stdarg.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

#include "asterisk.h"

ASTERISK_FILE_VERSION(__FILE__, "$Revision$")

#define AST_API_MODULE
#include "asterisk/lock.h"

#include "asterisk/io.h"
#include "asterisk/logger.h"
#include "asterisk/md5.h"
#include "asterisk/options.h"
#include "asterisk/compat.h"

#define AST_API_MODULE		/* ensure that inlinable API functions will be built in this module if required */
#include "asterisk/strings.h"

#define AST_API_MODULE		/* ensure that inlinable API functions will be built in this module if required */
#include "asterisk/time.h"

#define AST_API_MODULE		/* ensure that inlinable API functions will be built in this module if required */
#include "asterisk/utils.h"

static char base64[64];
static char b2a[256];

#if defined(__FreeBSD__) || defined(__OpenBSD__) || defined( __NetBSD__ ) || defined(__APPLE__) || defined(__CYGWIN__)

/* duh? ERANGE value copied from web... */
#define ERANGE 34
#undef gethostbyname

AST_MUTEX_DEFINE_STATIC(__mutex);

/* Recursive replacement for gethostbyname for BSD-based systems.  This
routine is derived from code originally written and placed in the public 
domain by Enzo Michelangeli <em@em.no-ip.com> */

static int gethostbyname_r (const char *name, struct hostent *ret, char *buf,
				size_t buflen, struct hostent **result, 
				int *h_errnop) 
{
	int hsave;
	struct hostent *ph;
	ast_mutex_lock(&__mutex); /* begin critical area */
	hsave = h_errno;

	ph = gethostbyname(name);
	*h_errnop = h_errno; /* copy h_errno to *h_herrnop */
	if (ph == NULL) {
		*result = NULL;
	} else {
		char **p, **q;
		char *pbuf;
		int nbytes=0;
		int naddr=0, naliases=0;
		/* determine if we have enough space in buf */

		/* count how many addresses */
		for (p = ph->h_addr_list; *p != 0; p++) {
			nbytes += ph->h_length; /* addresses */
			nbytes += sizeof(*p); /* pointers */
			naddr++;
		}
		nbytes += sizeof(*p); /* one more for the terminating NULL */

		/* count how many aliases, and total length of strings */
		for (p = ph->h_aliases; *p != 0; p++) {
			nbytes += (strlen(*p)+1); /* aliases */
			nbytes += sizeof(*p);  /* pointers */
			naliases++;
		}
		nbytes += sizeof(*p); /* one more for the terminating NULL */

		/* here nbytes is the number of bytes required in buffer */
		/* as a terminator must be there, the minimum value is ph->h_length */
		if(nbytes > buflen) {
			*result = NULL;
			ast_mutex_unlock(&__mutex); /* end critical area */
			return ERANGE; /* not enough space in buf!! */
		}

		/* There is enough space. Now we need to do a deep copy! */
		/* Allocation in buffer:
			from [0] to [(naddr-1) * sizeof(*p)]:
			pointers to addresses
			at [naddr * sizeof(*p)]:
			NULL
			from [(naddr+1) * sizeof(*p)] to [(naddr+naliases) * sizeof(*p)] :
			pointers to aliases
			at [(naddr+naliases+1) * sizeof(*p)]:
			NULL
			then naddr addresses (fixed length), and naliases aliases (asciiz).
		*/

		*ret = *ph;   /* copy whole structure (not its address!) */

		/* copy addresses */
		q = (char **)buf; /* pointer to pointers area (type: char **) */
		ret->h_addr_list = q; /* update pointer to address list */
		pbuf = buf + ((naddr+naliases+2)*sizeof(*p)); /* skip that area */
		for (p = ph->h_addr_list; *p != 0; p++) {
			memcpy(pbuf, *p, ph->h_length); /* copy address bytes */
			*q++ = pbuf; /* the pointer is the one inside buf... */
			pbuf += ph->h_length; /* advance pbuf */
		}
		*q++ = NULL; /* address list terminator */

		/* copy aliases */
		ret->h_aliases = q; /* update pointer to aliases list */
		for (p = ph->h_aliases; *p != 0; p++) {
			strcpy(pbuf, *p); /* copy alias strings */
			*q++ = pbuf; /* the pointer is the one inside buf... */
			pbuf += strlen(*p); /* advance pbuf */
			*pbuf++ = 0; /* string terminator */
		}
		*q++ = NULL; /* terminator */

		strcpy(pbuf, ph->h_name); /* copy alias strings */
		ret->h_name = pbuf;
		pbuf += strlen(ph->h_name); /* advance pbuf */
		*pbuf++ = 0; /* string terminator */

		*result = ret;  /* and let *result point to structure */

	}
	h_errno = hsave;  /* restore h_errno */
	ast_mutex_unlock(&__mutex); /* end critical area */

	return (*result == NULL); /* return 0 on success, non-zero on error */
}


#endif

/*! \brief Re-entrant (thread safe) version of gethostbyname that replaces the 
   standard gethostbyname (which is not thread safe)
*/
struct hostent *ast_gethostbyname(const char *host, struct ast_hostent *hp)
{
	int res;
	int herrno;
	int dots=0;
	const char *s;
	struct hostent *result = NULL;
	/* Although it is perfectly legitimate to lookup a pure integer, for
	   the sake of the sanity of people who like to name their peers as
	   integers, we break with tradition and refuse to look up a
	   pure integer */
	s = host;
	res = 0;
	while(s && *s) {
		if (*s == '.')
			dots++;
		else if (!isdigit(*s))
			break;
		s++;
	}
	if (!s || !*s) {
		/* Forge a reply for IP's to avoid octal IP's being interpreted as octal */
		if (dots != 3)
			return NULL;
		memset(hp, 0, sizeof(struct ast_hostent));
		hp->hp.h_addrtype = AF_INET;
		hp->hp.h_addr_list = (void *) hp->buf;
		hp->hp.h_addr = hp->buf + sizeof(void *);
		if (inet_pton(AF_INET, host, hp->hp.h_addr) > 0)
			return &hp->hp;
		return NULL;
		
	}
#ifdef SOLARIS
	result = gethostbyname_r(host, &hp->hp, hp->buf, sizeof(hp->buf), &herrno);

	if (!result || !hp->hp.h_addr_list || !hp->hp.h_addr_list[0])
		return NULL;
#else
	res = gethostbyname_r(host, &hp->hp, hp->buf, sizeof(hp->buf), &result, &herrno);

	if (res || !result || !hp->hp.h_addr_list || !hp->hp.h_addr_list[0])
		return NULL;
#endif
	return &hp->hp;
}



AST_MUTEX_DEFINE_STATIC(test_lock);
AST_MUTEX_DEFINE_STATIC(test_lock2);
static pthread_t test_thread; 
static int lock_count = 0;
static int test_errors = 0;

/*! \brief This is a regression test for recursive mutexes.
   test_for_thread_safety() will return 0 if recursive mutex locks are
   working properly, and non-zero if they are not working properly. */
static void *test_thread_body(void *data) 
{ 
	ast_mutex_lock(&test_lock);
	lock_count += 10;
	if (lock_count != 10) 
		test_errors++;
	ast_mutex_lock(&test_lock);
	lock_count += 10;
	if (lock_count != 20) 
		test_errors++;
	ast_mutex_lock(&test_lock2);
	ast_mutex_unlock(&test_lock);
	lock_count -= 10;
	if (lock_count != 10) 
		test_errors++;
	ast_mutex_unlock(&test_lock);
	lock_count -= 10;
	ast_mutex_unlock(&test_lock2);
	if (lock_count != 0) 
		test_errors++;
	return NULL;
} 

int test_for_thread_safety(void)
{ 
	ast_mutex_lock(&test_lock2);
	ast_mutex_lock(&test_lock);
	lock_count += 1;
	ast_mutex_lock(&test_lock);
	lock_count += 1;
	ast_pthread_create(&test_thread, NULL, test_thread_body, NULL); 
	usleep(100);
	if (lock_count != 2) 
		test_errors++;
	ast_mutex_unlock(&test_lock);
	lock_count -= 1;
	usleep(100); 
	if (lock_count != 1) 
		test_errors++;
	ast_mutex_unlock(&test_lock);
	lock_count -= 1;
	if (lock_count != 0) 
		test_errors++;
	ast_mutex_unlock(&test_lock2);
	usleep(100);
	if (lock_count != 0) 
		test_errors++;
	pthread_join(test_thread, NULL);
	return(test_errors);          /* return 0 on success. */
}

/*! \brief ast_md5_hash: Produce 16 char MD5 hash of value. ---*/
void ast_md5_hash(char *output, char *input)
{
	struct MD5Context md5;
	unsigned char digest[16];
	char *ptr;
	int x;

	MD5Init(&md5);
	MD5Update(&md5, (unsigned char *)input, strlen(input));
	MD5Final(digest, &md5);
	ptr = output;
	for (x=0; x<16; x++)
		ptr += sprintf(ptr, "%2.2x", digest[x]);
}

int ast_base64decode(unsigned char *dst, const char *src, int max)
{
	int cnt = 0;
	unsigned int byte = 0;
	unsigned int bits = 0;
	int incnt = 0;
#if 0
	unsigned char *odst = dst;
#endif
	while(*src && (cnt < max)) {
		/* Shift in 6 bits of input */
		byte <<= 6;
		byte |= (b2a[(int)(*src)]) & 0x3f;
		bits += 6;
#if 0
		printf("Add: %c %s\n", *src, binary(b2a[(int)(*src)] & 0x3f, 6));
#endif
		src++;
		incnt++;
		/* If we have at least 8 bits left over, take that character 
		   off the top */
		if (bits >= 8)  {
			bits -= 8;
			*dst = (byte >> bits) & 0xff;
#if 0
			printf("Remove: %02x %s\n", *dst, binary(*dst, 8));
#endif
			dst++;
			cnt++;
		}
	}
#if 0
	dump(odst, cnt);
#endif
	/* Dont worry about left over bits, they're extra anyway */
	return cnt;
}

int ast_base64encode(char *dst, const unsigned char *src, int srclen, int max)
{
	int cnt = 0;
	unsigned int byte = 0;
	int bits = 0;
	int index;
	int cntin = 0;
#if 0
	char *odst = dst;
	dump(src, srclen);
#endif
	/* Reserve one bit for end */
	max--;
	while((cntin < srclen) && (cnt < max)) {
		byte <<= 8;
#if 0
		printf("Add: %02x %s\n", *src, binary(*src, 8));
#endif
		byte |= *(src++);
		bits += 8;
		cntin++;
		while((bits >= 6) && (cnt < max)) {
			bits -= 6;
			/* We want only the top */
			index = (byte >> bits) & 0x3f;
			*dst = base64[index];
#if 0
			printf("Remove: %c %s\n", *dst, binary(index, 6));
#endif
			dst++;
			cnt++;
		}
	}
	if (bits && (cnt < max)) {
		/* Add one last character for the remaining bits, 
		   padding the rest with 0 */
		byte <<= (6 - bits);
		index = (byte) & 0x3f;
		*(dst++) = base64[index];
		cnt++;
	}
	*dst = '\0';
	return cnt;
}

static void base64_init(void)
{
	int x;
	memset(b2a, -1, sizeof(b2a));
	/* Initialize base-64 Conversion table */
	for (x=0;x<26;x++) {
		/* A-Z */
		base64[x] = 'A' + x;
		b2a['A' + x] = x;
		/* a-z */
		base64[x + 26] = 'a' + x;
		b2a['a' + x] = x + 26;
		/* 0-9 */
		if (x < 10) {
			base64[x + 52] = '0' + x;
			b2a['0' + x] = x + 52;
		}
	}
	base64[62] = '+';
	base64[63] = '/';
	b2a[(int)'+'] = 62;
	b2a[(int)'/'] = 63;
}

/*! \brief  ast_uri_encode: Turn text string to URI-encoded %XX version ---*/
/* 	At this point, we're converting from ISO-8859-x (8-bit), not UTF8
	as in the SIP protocol spec 
	If doreserved == 1 we will convert reserved characters also.
	RFC 2396, section 2.4
	outbuf needs to have more memory allocated than the instring
	to have room for the expansion. Every char that is converted
	is replaced by three ASCII characters.

	Note: The doreserved option is needed for replaces header in
	SIP transfers.
*/
char *ast_uri_encode(char *string, char *outbuf, int buflen, int doreserved) 
{
	char *reserved = ";/?:@&=+$, ";	/* Reserved chars */

 	char *ptr  = string;	/* Start with the string */
	char *out = NULL;
	char *buf = NULL;

	strncpy(outbuf, string, buflen);

	/* If there's no characters to convert, just go through and don't do anything */
	while (*ptr) {
		if (((unsigned char) *ptr) > 127 || (doreserved && strchr(reserved, *ptr)) ) {
			/* Oops, we need to start working here */
			if (!buf) {
				buf = outbuf;
				out = buf + (ptr - string) ;	/* Set output ptr */
			}
			out += sprintf(out, "%%%02x", (unsigned char) *ptr);
		} else if (buf) {
			*out = *ptr;	/* Continue copying the string */
			out++;
		} 
		ptr++;
	}
	if (buf)
		*out = '\0';
	return outbuf;
}

/*! \brief  ast_uri_decode: Decode SIP URI, URN, URL (overwrite the string)  ---*/
void ast_uri_decode(char *s) 
{
	char *o;
	unsigned int tmp;

	for (o = s; *s; s++, o++) {
		if (*s == '%' && strlen(s) > 2 && sscanf(s + 1, "%2x", &tmp) == 1) {
			/* have '%', two chars and correct parsing */
			*o = tmp;
			s += 2;	/* Will be incremented once more when we break out */
		} else /* all other cases, just copy */
			*o = *s;
	}
	*o = '\0';
}

/*! \brief  ast_inet_ntoa: Recursive thread safe replacement of inet_ntoa */
const char *ast_inet_ntoa(char *buf, int bufsiz, struct in_addr ia)
{
	return inet_ntop(AF_INET, &ia, buf, bufsiz);
}

int ast_utils_init(void)
{
	base64_init();
	return 0;
}

#ifndef __linux__
#undef pthread_create /* For ast_pthread_create function only */
#endif /* !__linux__ */

int ast_pthread_create_stack(pthread_t *thread, pthread_attr_t *attr, void *(*start_routine)(void *), void *data, size_t stacksize)
{
	pthread_attr_t lattr;
	if (!attr) {
		pthread_attr_init(&lattr);
		attr = &lattr;
	}
#ifdef __linux__
	/* On Linux, pthread_attr_init() defaults to PTHREAD_EXPLICIT_SCHED,
	   which is kind of useless. Change this here to
	   PTHREAD_INHERIT_SCHED; that way the -p option to set realtime
	   priority will propagate down to new threads by default.
	   This does mean that callers cannot set a different priority using
	   PTHREAD_EXPLICIT_SCHED in the attr argument; instead they must set
	   the priority afterwards with pthread_setschedparam(). */
	errno = pthread_attr_setinheritsched(attr, PTHREAD_INHERIT_SCHED);
	if (errno)
		ast_log(LOG_WARNING, "pthread_attr_setinheritsched returned non-zero: %s\n", strerror(errno));
#endif

	if (!stacksize)
		stacksize = AST_STACKSIZE;
	errno = pthread_attr_setstacksize(attr, stacksize);
	if (errno)
		ast_log(LOG_WARNING, "pthread_attr_setstacksize returned non-zero: %s\n", strerror(errno));
	return pthread_create(thread, attr, start_routine, data); /* We're in ast_pthread_create, so it's okay */
}

int ast_wait_for_input(int fd, int ms)
{
	struct pollfd pfd[1];
	memset(pfd, 0, sizeof(pfd));
	pfd[0].fd = fd;
	pfd[0].events = POLLIN|POLLPRI;
	return poll(pfd, 1, ms);
}

char *ast_strip_quoted(char *s, const char *beg_quotes, const char *end_quotes)
{
	char *e;
	char *q;

	s = ast_strip(s);
	if ((q = strchr(beg_quotes, *s)) && *q != '\0') {
		e = s + strlen(s) - 1;
		if (*e == *(end_quotes + (q - beg_quotes))) {
			s++;
			*e = '\0';
		}
	}

	return s;
}

int ast_build_string_va(char **buffer, size_t *space, const char *fmt, va_list ap)
{
	int result;

	if (!buffer || !*buffer || !space || !*space)
		return -1;

	result = vsnprintf(*buffer, *space, fmt, ap);

	if (result < 0)
		return -1;
	else if (result > *space)
		result = *space;

	*buffer += result;
	*space -= result;
	return 0;
}

int ast_build_string(char **buffer, size_t *space, const char *fmt, ...)
{
	va_list ap;
	int result;

	va_start(ap, fmt);
	result = ast_build_string_va(buffer, space, fmt, ap);
	va_end(ap);

	return result;
}

int ast_true(const char *s)
{
	if (ast_strlen_zero(s))
		return 0;

	/* Determine if this is a true value */
	if (!strcasecmp(s, "yes") ||
	    !strcasecmp(s, "true") ||
	    !strcasecmp(s, "y") ||
	    !strcasecmp(s, "t") ||
	    !strcasecmp(s, "1") ||
	    !strcasecmp(s, "on"))
		return -1;

	return 0;
}

int ast_false(const char *s)
{
	if (ast_strlen_zero(s))
		return 0;

	/* Determine if this is a false value */
	if (!strcasecmp(s, "no") ||
	    !strcasecmp(s, "false") ||
	    !strcasecmp(s, "n") ||
	    !strcasecmp(s, "f") ||
	    !strcasecmp(s, "0") ||
	    !strcasecmp(s, "off"))
		return -1;

	return 0;
}

#define ONE_MILLION	1000000
/*
 * put timeval in a valid range. usec is 0..999999
 * negative values are not allowed and truncated.
 */
static struct timeval tvfix(struct timeval a)
{
	if (a.tv_usec >= ONE_MILLION) {
		ast_log(LOG_WARNING, "warning too large timestamp %ld.%ld\n",
			a.tv_sec, (long int) a.tv_usec);
		a.tv_sec += a.tv_usec / ONE_MILLION;
		a.tv_usec %= ONE_MILLION;
	} else if (a.tv_usec < 0) {
		ast_log(LOG_WARNING, "warning negative timestamp %ld.%ld\n",
			a.tv_sec, (long int) a.tv_usec);
		a.tv_usec = 0;
	}
	return a;
}

struct timeval ast_tvadd(struct timeval a, struct timeval b)
{
	/* consistency checks to guarantee usec in 0..999999 */
	a = tvfix(a);
	b = tvfix(b);
	a.tv_sec += b.tv_sec;
	a.tv_usec += b.tv_usec;
	if (a.tv_usec >= ONE_MILLION) {
		a.tv_sec++;
		a.tv_usec -= ONE_MILLION;
	}
	return a;
}

struct timeval ast_tvsub(struct timeval a, struct timeval b)
{
	/* consistency checks to guarantee usec in 0..999999 */
	a = tvfix(a);
	b = tvfix(b);
	a.tv_sec -= b.tv_sec;
	a.tv_usec -= b.tv_usec;
	if (a.tv_usec < 0) {
		a.tv_sec-- ;
		a.tv_usec += ONE_MILLION;
	}
	return a;
}
#undef ONE_MILLION

#ifndef HAVE_STRCASESTR
static char *upper(const char *orig, char *buf, int bufsize)
{
	int i = 0;

	while (i < (bufsize - 1) && orig[i]) {
		buf[i] = toupper(orig[i]);
		i++;
	}

	buf[i] = '\0';

	return buf;
}

char *strcasestr(const char *haystack, const char *needle)
{
	char *u1, *u2;
	int u1len = strlen(haystack) + 1, u2len = strlen(needle) + 1;

	u1 = alloca(u1len);
	u2 = alloca(u2len);
	if (u1 && u2) {
		char *offset;
		if (u2len > u1len) {
			/* Needle bigger than haystack */
			return NULL;
		}
		offset = strstr(upper(haystack, u1, u1len), upper(needle, u2, u2len));
		if (offset) {
			/* Return the offset into the original string */
			return ((char *)((unsigned long)haystack + (unsigned long)(offset - u1)));
		} else {
			return NULL;
		}
	} else {
		ast_log(LOG_ERROR, "Out of memory\n");
		return NULL;
	}
}
#endif /* !HAVE_STRCASESTR */

#ifndef HAVE_STRNLEN
size_t strnlen(const char *s, size_t n)
{
	size_t len;

	for (len=0; len < n; len++)
		if (s[len] == '\0')
			break;

	return len;
}
#endif /* !HAVE_STRNLEN */

#if !defined(HAVE_STRNDUP) && !defined(__AST_DEBUG_MALLOC)
char *strndup(const char *s, size_t n)
{
	size_t len = strnlen(s, n);
	char *new = malloc(len + 1);

	if (!new)
		return NULL;

	new[len] = '\0';
	return memcpy(new, s, len);
}
#endif /* !defined(HAVE_STRNDUP) && !defined(__AST_DEBUG_MALLOC) */

#if !defined(HAVE_VASPRINTF) && !defined(__AST_DEBUG_MALLOC)
int vasprintf(char **strp, const char *fmt, va_list ap)
{
	int size;
	va_list ap2;
	char s;

	*strp = NULL;
	va_copy(ap2, ap);
	size = vsnprintf(&s, 1, fmt, ap2);
	va_end(ap2);
	*strp = malloc(size + 1);
	if (!*strp)
		return -1;
	vsnprintf(*strp, size + 1, fmt, ap);

	return size;
}
#endif /* !defined(HAVE_VASPRINTF) && !defined(__AST_DEBUG_MALLOC) */

#ifndef HAVE_STRTOQ
#ifndef LONG_MIN
#define LONG_MIN        (-9223372036854775807L-1L)
	                                 /* min value of a "long int" */
#endif
#ifndef LONG_MAX
#define LONG_MAX        9223372036854775807L
	                                 /* max value of a "long int" */
#endif

/*
 * Convert a string to a quad integer.
 *
 * Ignores `locale' stuff.  Assumes that the upper and lower case
 * alphabets and digits are each contiguous.
 */
uint64_t strtoq(const char *nptr, char **endptr, int base)
{
	 const char *s;
	 uint64_t acc;
	 unsigned char c;
	 uint64_t qbase, cutoff;
	 int neg, any, cutlim;

	 /*
	  * Skip white space and pick up leading +/- sign if any.
	  * If base is 0, allow 0x for hex and 0 for octal, else
	  * assume decimal; if base is already 16, allow 0x.
	  */
	 s = nptr;
	 do {
	         c = *s++;
	 } while (isspace(c));
	 if (c == '-') {
	         neg = 1;
	         c = *s++;
	 } else {
	         neg = 0;
	         if (c == '+')
	                 c = *s++;
	 }
	 if ((base == 0 || base == 16) &&
	     c == '\0' && (*s == 'x' || *s == 'X')) {
	         c = s[1];
	         s += 2;
	         base = 16;
	 }
	 if (base == 0)
	         base = c == '\0' ? 8 : 10;

	 /*
	  * Compute the cutoff value between legal numbers and illegal
	  * numbers.  That is the largest legal value, divided by the
	  * base.  An input number that is greater than this value, if
	  * followed by a legal input character, is too big.  One that
	  * is equal to this value may be valid or not; the limit
	  * between valid and invalid numbers is then based on the last
	  * digit.  For instance, if the range for quads is
	  * [-9223372036854775808..9223372036854775807] and the input base
	  * is 10, cutoff will be set to 922337203685477580 and cutlim to
	  * either 7 (neg==0) or 8 (neg==1), meaning that if we have
	  * accumulated a value > 922337203685477580, or equal but the
	  * next digit is > 7 (or 8), the number is too big, and we will
	  * return a range error.
	  *
	  * Set any if any `digits' consumed; make it negative to indicate
	  * overflow.
	  */
	 qbase = (unsigned)base;
	 cutoff = neg ? (uint64_t)-(LONG_MIN + LONG_MAX) + LONG_MAX : LONG_MAX;
	 cutlim = cutoff % qbase;
	 cutoff /= qbase;
	 for (acc = 0, any = 0;; c = *s++) {
	         if (!isascii(c))
	                 break;
	         if (isdigit(c))
	                 c -= '\0';
	         else if (isalpha(c))
	                 c -= isupper(c) ? 'A' - 10 : 'a' - 10;
	         else
	                 break;
	         if (c >= base)
	                 break;
	         if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
	                 any = -1;
	         else {
	                 any = 1;
	                 acc *= qbase;
	                 acc += c;
	         }
	 }
	 if (any < 0) {
	         acc = neg ? LONG_MIN : LONG_MAX;
	 } else if (neg)
	         acc = -acc;
	 if (endptr != 0)
	         *((const char **)endptr) = any ? s - 1 : nptr;
	 return acc;
}
#endif /* !HAVE_STRTOQ */

#ifndef HAVE_GETLOADAVG
#ifdef linux
/* Alternative method of getting load avg on Linux only */
int getloadavg(double *list, int nelem)
{
	FILE *LOADAVG;
	double avg[3] = { 0.0, 0.0, 0.0 };
	int i, res = -1;

	if ((LOADAVG = fopen("/proc/loadavg", "r"))) {
		fscanf(LOADAVG, "%lf %lf %lf", &avg[0], &avg[1], &avg[2]);
		res = 0;
		fclose(LOADAVG);
	}

	for (i = 0; (i < nelem) && (i < 3); i++) {
		list[i] = avg[i];
	}

	return res;
}
#else /* !linux */
/* Return something that won't cancel the call, but still return -1, in case
 * we correct the implementation to check return value */
int getloadavg(double *list, int nelem)
{
	int i;

	for (i = 0; i < nelem; i++) {
		list[i] = 0.1;
	}
	return -1;
}
#endif /* linux */
#endif /* !defined(_BSD_SOURCE) */

char *ast_process_quotes_and_slashes(char *start, char find, char replace_with)
{
 	char *dataPut = start;
	int inEscape = 0;
	int inQuotes = 0;

	for (; *start; start++) {
		if (inEscape) {
			*dataPut++ = *start;       /* Always goes verbatim */
			inEscape = 0;
    		} else {
			if (*start == '\\') {
				inEscape = 1;      /* Do not copy \ into the data */
			} else if (*start == '\'') {
				inQuotes = 1-inQuotes;   /* Do not copy ' into the data */
			} else {
				/* Replace , with |, unless in quotes */
				*dataPut++ = inQuotes ? *start : ((*start==find) ? replace_with : *start);
			}
		}
	}
	if (start != dataPut)
		*dataPut = 0;
	return dataPut;
}

void ast_enable_packet_fragmentation(int sock)
{
#ifdef __linux__
	int val = IP_PMTUDISC_DONT;
	
	if (setsockopt(sock, IPPROTO_IP, IP_MTU_DISCOVER, &val, sizeof(val)))
		ast_log(LOG_WARNING, "Unable to disable PMTU discovery. Large UDP packets may fail to be delivered when sent from this socket.\n");
#endif
}

AST_MUTEX_DEFINE_STATIC(fetchadd_m); /* used for all fetc&add ops */

int ast_atomic_fetchadd_int_slow(volatile int *p, int v)
{
        int ret;
        ast_mutex_lock(&fetchadd_m);
        ret = *p;
        *p += v;
        ast_mutex_unlock(&fetchadd_m);
        return ret;
}