~singpolyma/asterisk

ref: 51af79b42e4ae7d1831603633d73bf0df179720e asterisk/main/acl.c -rw-r--r-- 26.3 KiB
51af79b4Christopher Vollick Content Created By Initiator 2: Electric Boogaloo 9 months ago
                                                                                
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
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 1999 - 2012, Digium, Inc.
 *
 * Mark Spencer <markster@digium.com>
 *
 * 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 Various sorts of access control
 *
 * \author Mark Spencer <markster@digium.com>
 */

/*** MODULEINFO
	<support_level>core</support_level>
 ***/

#include "asterisk.h"

#include "asterisk/network.h"

#if defined(__OpenBSD__) || defined(__NetBSD__) || defined(__FreeBSD__) || defined(__Darwin__)
#include <fcntl.h>
#include <net/route.h>
#endif

#if defined(SOLARIS)
#include <sys/sockio.h>
#include <net/if.h>
#elif defined(HAVE_GETIFADDRS)
#include <ifaddrs.h>
#endif

#include "asterisk/acl.h"
#include "asterisk/channel.h"
#include "asterisk/utils.h"
#include "asterisk/lock.h"
#include "asterisk/srv.h"

#if (!defined(SOLARIS) && !defined(HAVE_GETIFADDRS))
static int get_local_address(struct ast_sockaddr *ourip)
{
	return -1;
}
#else
static void score_address(const struct sockaddr_in *sin, struct in_addr *best_addr, int *best_score)
{
	const char *address;
	int score;

	address = ast_inet_ntoa(sin->sin_addr);

	/* RFC 1700 alias for the local network */
	if (address[0] == '0') {
		score = -25;
	/* RFC 1700 localnet */
	} else if (strncmp(address, "127", 3) == 0) {
		score = -20;
	/* RFC 1918 non-public address space */
	} else if (strncmp(address, "10.", 3) == 0) {
		score = -5;
	/* RFC 1918 non-public address space */
	} else if (strncmp(address, "172", 3) == 0) {
		/* 172.16.0.0 - 172.19.255.255, but not 172.160.0.0 - 172.169.255.255 */
		if (address[4] == '1' && address[5] >= '6' && address[6] == '.') {
			score = -5;
		/* 172.20.0.0 - 172.29.255.255, but not 172.200.0.0 - 172.255.255.255 nor 172.2.0.0 - 172.2.255.255 */
		} else if (address[4] == '2' && address[6] == '.') {
			score = -5;
		/* 172.30.0.0 - 172.31.255.255, but not 172.3.0.0 - 172.3.255.255 */
		} else if (address[4] == '3' && (address[5] == '0' || address[5] == '1')) {
			score = -5;
		/* All other 172 addresses are public */
		} else {
			score = 0;
		}
	/* RFC 2544 Benchmark test range (198.18.0.0 - 198.19.255.255, but not 198.180.0.0 - 198.199.255.255) */
	} else if (strncmp(address, "198.1", 5) == 0 && address[5] >= '8' && address[6] == '.') {
		score = -10;
	/* RFC 1918 non-public address space */
	} else if (strncmp(address, "192.168", 7) == 0) {
		score = -5;
	/* RFC 3330 Zeroconf network */
	} else if (strncmp(address, "169.254", 7) == 0) {
		/*!\note Better score than a test network, but not quite as good as RFC 1918
		 * address space.  The reason is that some Linux distributions automatically
		 * configure a Zeroconf address before trying DHCP, so we want to prefer a
		 * DHCP lease to a Zeroconf address.
		 */
		score = -10;
	/* RFC 3330 Test network */
	} else if (strncmp(address, "192.0.2.", 8) == 0) {
		score = -15;
	/* Every other address should be publically routable */
	} else {
		score = 0;
	}

	if (score > *best_score) {
		*best_score = score;
		memcpy(best_addr, &sin->sin_addr, sizeof(*best_addr));
	}
}

static int get_local_address(struct ast_sockaddr *ourip)
{
	int s, res = -1;
#ifdef SOLARIS
	struct lifreq *ifr = NULL;
	struct lifnum ifn;
	struct lifconf ifc;
	struct sockaddr_in *sa;
	char *buf = NULL;
	int bufsz, x;
#endif /* SOLARIS */
#if defined(__OpenBSD__) || defined(__NetBSD__) || defined(__FreeBSD__) || defined(__linux__) || defined(__Darwin__) || defined(__GLIBC__)
	struct ifaddrs *ifap, *ifaphead;
	int rtnerr;
	const struct sockaddr_in *sin;
#endif /* BSD_OR_LINUX */
	struct in_addr best_addr;
	int best_score = -100;
	memset(&best_addr, 0, sizeof(best_addr));

#if defined(__OpenBSD__) || defined(__NetBSD__) || defined(__FreeBSD__) || defined(__linux__) || defined(__Darwin__) || defined(__GLIBC__)
	rtnerr = getifaddrs(&ifaphead);
	if (rtnerr) {
		perror(NULL);
		return -1;
	}
#endif /* BSD_OR_LINUX */

	s = socket(AF_INET, SOCK_STREAM, 0);

	if (s > 0) {
#if defined(__OpenBSD__) || defined(__NetBSD__) || defined(__FreeBSD__) || defined(__linux__) || defined(__Darwin__) || defined(__GLIBC__)
		for (ifap = ifaphead; ifap; ifap = ifap->ifa_next) {

			if (ifap->ifa_addr && ifap->ifa_addr->sa_family == AF_INET) {
				sin = (const struct sockaddr_in *) ifap->ifa_addr;
				score_address(sin, &best_addr, &best_score);
				res = 0;

				if (best_score == 0) {
					break;
				}
			}
		}
#endif /* BSD_OR_LINUX */

		/* There is no reason whatsoever that this shouldn't work on Linux or BSD also. */
#ifdef SOLARIS
		/* Get a count of interfaces on the machine */
		ifn.lifn_family = AF_INET;
		ifn.lifn_flags = 0;
		ifn.lifn_count = 0;
		if (ioctl(s, SIOCGLIFNUM, &ifn) < 0) {
			close(s);
			return -1;
		}

		bufsz = ifn.lifn_count * sizeof(struct lifreq);
		if (!(buf = ast_malloc(bufsz))) {
			close(s);
			return -1;
		}
		memset(buf, 0, bufsz);

		/* Get a list of interfaces on the machine */
		ifc.lifc_len = bufsz;
		ifc.lifc_buf = buf;
		ifc.lifc_family = AF_INET;
		ifc.lifc_flags = 0;
		if (ioctl(s, SIOCGLIFCONF, &ifc) < 0) {
			close(s);
			ast_free(buf);
			return -1;
		}

		for (ifr = ifc.lifc_req, x = 0; x < ifn.lifn_count; ifr++, x++) {
			sa = (struct sockaddr_in *)&(ifr->lifr_addr);
			score_address(sa, &best_addr, &best_score);
			res = 0;

			if (best_score == 0) {
				break;
			}
		}

		ast_free(buf);
#endif /* SOLARIS */

		close(s);
	}
#if defined(__OpenBSD__) || defined(__NetBSD__) || defined(__FreeBSD__) || defined(__linux__) || defined(__Darwin__)
	freeifaddrs(ifaphead);
#endif /* BSD_OR_LINUX */

	if (res == 0 && ourip) {
		ast_sockaddr_setnull(ourip);
		ourip->ss.ss_family = AF_INET;
		((struct sockaddr_in *)&ourip->ss)->sin_addr = best_addr;
	}
	return res;
}
#endif /* HAVE_GETIFADDRS */

/* Free HA structure */
void ast_free_ha(struct ast_ha *ha)
{
	struct ast_ha *hal;
	while (ha) {
		hal = ha;
		ha = ha->next;
		ast_free(hal);
	}
}

/* Free ACL list structure */
struct ast_acl_list *ast_free_acl_list(struct ast_acl_list *acl_list)
{
	struct ast_acl *current;

	if (!acl_list) {
		return NULL;
	}

	AST_LIST_LOCK(acl_list);
	while ((current = AST_LIST_REMOVE_HEAD(acl_list, list))) {
		ast_free_ha(current->acl);
		ast_free(current);
	}
	AST_LIST_UNLOCK(acl_list);

	AST_LIST_HEAD_DESTROY(acl_list);
	ast_free(acl_list);

	return NULL;
}

/* Copy HA structure */
void ast_copy_ha(const struct ast_ha *from, struct ast_ha *to)
{
	ast_sockaddr_copy(&to->addr, &from->addr);
	ast_sockaddr_copy(&to->netmask, &from->netmask);
	to->sense = from->sense;
}

/* Create duplicate of ha structure */
static struct ast_ha *ast_duplicate_ha(struct ast_ha *original)
{
	struct ast_ha *new_ha;

	if ((new_ha = ast_calloc(1, sizeof(*new_ha)))) {
		/* Copy from original to new object */
		ast_copy_ha(original, new_ha);
	}

	return new_ha;
}

/* Create duplicate HA link list */
/*  Used in chan_sip2 templates */
struct ast_ha *ast_duplicate_ha_list(struct ast_ha *original)
{
	struct ast_ha *start = original;
	struct ast_ha *ret = NULL;
	struct ast_ha *current, *prev = NULL;

	while (start) {
		current = ast_duplicate_ha(start);  /* Create copy of this object */
		if (!current) {
			ast_free_ha(ret);

			return NULL;
		}

		if (prev) {
			prev->next = current;           /* Link previous to this object */
		}

		if (!ret) {
			ret = current;                  /* Save starting point */
		}

		start = start->next;                /* Go to next object */
		prev = current;                     /* Save pointer to this object */
	}
	return ret;                             /* Return start of list */
}

static int acl_new(struct ast_acl **pointer, const char *name) {
	struct ast_acl *acl;
	if (!(acl = ast_calloc(1, sizeof(*acl)))) {
		return 1;
	}

	*pointer = acl;
	ast_copy_string(acl->name, name, ACL_NAME_LENGTH);
	return 0;
}

struct ast_acl_list *ast_duplicate_acl_list(struct ast_acl_list *original)
{
	struct ast_acl_list *clone;
	struct ast_acl *current_cursor;
	struct ast_acl *current_clone;

	/* Early return if we receive a duplication request for a NULL original. */
	if (!original) {
		return NULL;
	}

	if (!(clone = ast_calloc(1, sizeof(*clone)))) {
		ast_log(LOG_ERROR, "Failed to allocate ast_acl_list struct while cloning an ACL\n");
		return NULL;
	}
	AST_LIST_HEAD_INIT(clone);

	AST_LIST_LOCK(original);

	AST_LIST_TRAVERSE(original, current_cursor, list) {
		if ((acl_new(&current_clone, current_cursor->name))) {
			ast_log(LOG_ERROR, "Failed to allocate ast_acl struct while cloning an ACL.\n");
			ast_free_acl_list(clone);
			clone = NULL;
			break;
		}

		/* Copy data from original ACL to clone ACL */
		current_clone->acl = ast_duplicate_ha_list(current_cursor->acl);

		current_clone->is_invalid = current_cursor->is_invalid;
		current_clone->is_realtime = current_cursor->is_realtime;

		AST_LIST_INSERT_TAIL(clone, current_clone, list);

		if (current_cursor->acl && !current_clone->acl) {
			/* Deal with failure after adding to clone so we don't have to free
			 * current_clone separately. */
			ast_log(LOG_ERROR, "Failed to duplicate HA list while cloning ACL.\n");
			ast_free_acl_list(clone);
			clone = NULL;
			break;
		}
	}

	AST_LIST_UNLOCK(original);

	return clone;
}

/*!
 * \brief
 * Parse a netmask in CIDR notation
 *
 * \details
 * For a mask of an IPv4 address, this should be a number between 0 and 32. For
 * a mask of an IPv6 address, this should be a number between 0 and 128. This
 * function creates an IPv6 ast_sockaddr from the given netmask. For masks of
 * IPv4 addresses, this is accomplished by adding 96 to the original netmask.
 *
 * \param[out] addr The ast_sockaddr produced from the CIDR netmask
 * \param is_v4 Tells if the address we are masking is IPv4.
 * \param mask_str The CIDR mask to convert
 * \retval -1 Failure
 * \retval 0 Success
 */
static int parse_cidr_mask(struct ast_sockaddr *addr, int is_v4, const char *mask_str)
{
	int mask;

	if (sscanf(mask_str, "%30d", &mask) != 1) {
		return -1;
	}

	if (is_v4) {
		struct sockaddr_in sin;
		if (mask < 0 || mask > 32) {
			return -1;
		}
		memset(&sin, 0, sizeof(sin));
		sin.sin_family = AF_INET;
		/* If mask is 0, then we already have the
		 * appropriate all 0s address in sin from
		 * the above memset.
		 */
		if (mask != 0) {
			sin.sin_addr.s_addr = htonl(0xFFFFFFFF << (32 - mask));
		}
		ast_sockaddr_from_sin(addr, &sin);
	} else {
		struct sockaddr_in6 sin6;
		int i;
		if (mask < 0 || mask > 128) {
			return -1;
		}
		memset(&sin6, 0, sizeof(sin6));
		sin6.sin6_family = AF_INET6;
		for (i = 0; i < 4; ++i) {
			/* Once mask reaches 0, we don't have
			 * to explicitly set anything anymore
			 * since sin6 was zeroed out already
			 */
			if (mask > 0) {
				V6_WORD(&sin6, i) = htonl(0xFFFFFFFF << (mask < 32 ? (32 - mask) : 0));
				mask -= mask < 32 ? mask : 32;
			}
		}
		memcpy(&addr->ss, &sin6, sizeof(sin6));
		addr->len = sizeof(sin6);
	}

	return 0;
}

void ast_append_acl(const char *sense, const char *stuff, struct ast_acl_list **path, int *error, int *named_acl_flag)
{
	struct ast_acl *acl = NULL;
	struct ast_acl *current;
	struct ast_acl_list *working_list;

	char *tmp, *list;

	/* If the ACL list is currently uninitialized, it must be initialized. */
	if (*path == NULL) {
		struct ast_acl_list *list;
		list = ast_calloc(1, sizeof(*list));
		if (!list) {
			/* Allocation Error */
			if (error) {
				*error = 1;
			}
			return;
		}

		AST_LIST_HEAD_INIT(list);
		*path = list;
	}

	working_list = *path;

	AST_LIST_LOCK(working_list);

	/* First we need to determine if we will need to add a new ACL node or if we can use an existing one. */
	if (strncasecmp(sense, "a", 1)) {
		/* The first element in the path should be the unnamed, base ACL. If that's the case, we use it. If not,
		 * we have to make one and link it up appropriately. */
		current = AST_LIST_FIRST(working_list);

		if (!current || !ast_strlen_zero(current->name)) {
			if (acl_new(&acl, "")) {
				if (error) {
					*error = 1;
				}
				AST_LIST_UNLOCK(working_list);
				return;
			}
			// Need to INSERT the ACL at the head here.
			AST_LIST_INSERT_HEAD(working_list, acl, list);
		} else {
			/* If the first element was already the unnamed base ACL, we just use that one. */
			acl = current;
		}

		/* With the proper ACL set for modification, we can just pass this off to the ast_ha append function. */
		acl->acl = ast_append_ha(sense, stuff, acl->acl, error);

		AST_LIST_UNLOCK(working_list);
		return;
	}

	/* We are in ACL append mode, so we know we'll be adding one or more named ACLs. */
	list = ast_strdupa(stuff);

	while ((tmp = strsep(&list, ","))) {
		struct ast_ha *named_ha;
		int already_included = 0;

		/* Remove leading whitespace from the string in case the user put spaces between items */
		tmp = ast_skip_blanks(tmp);

		/* The first step is to check for a duplicate */
		AST_LIST_TRAVERSE(working_list, current, list) {
			if (!strcasecmp(current->name, tmp)) { /* ACL= */
				/* Inclusion of the same ACL multiple times isn't a catastrophic error, but it will raise the error flag and skip the entry. */
				ast_log(LOG_ERROR, "Named ACL '%s' occurs multiple times in ACL definition. "
				                   "Please update your ACL configuration.\n", tmp);
				if (error) {
					*error = 1;
				}
				already_included = 1;
				break;
			}
		}

		if (already_included) {
			continue;
		}

		if (acl_new(&acl, tmp)) {
			/* This is a catastrophic allocation error and we'll return immediately if this happens. */
			if (error) {
				*error = 1;
			}
			AST_LIST_UNLOCK(working_list);
			return;
		}

		/* Attempt to grab the Named ACL we are looking for. */
		named_ha = ast_named_acl_find(tmp, &acl->is_realtime, &acl->is_invalid);

		/* Set the ACL's ast_ha to the duplicated named ACL retrieved above. */
		acl->acl = named_ha;

		/* Raise the named_acl_flag since we are adding a named ACL to the ACL container. */
		if (named_acl_flag) {
			*named_acl_flag = 1;
		}

		/* Now insert the new ACL at the end of the list. */
		AST_LIST_INSERT_TAIL(working_list, acl, list);
	}

	AST_LIST_UNLOCK(working_list);
}

int ast_acl_list_is_empty(struct ast_acl_list *acl_list)
{
	struct ast_acl *head;

	if (!acl_list) {
		return 1;
	}

	AST_LIST_LOCK(acl_list);
	head = AST_LIST_FIRST(acl_list);
	AST_LIST_UNLOCK(acl_list);

	if (head) {
		return 0;
	}

	return 1;
}

/*!
 * \internal
 * \brief Used by ast_append_ha to avoid ast_strdupa in a loop.
 *
 * \note This function is only called at debug level 3 and higher.
 */
static void debug_ha_sense_appended(struct ast_ha *ha)
{
	const char *parsed_mask = ast_strdupa(ast_sockaddr_stringify(&ha->netmask));

	ast_log(LOG_DEBUG, "%s/%s sense %u appended to ACL\n",
		ast_sockaddr_stringify(&ha->addr),
		parsed_mask,
		ha->sense);
}

struct ast_ha *ast_append_ha(const char *sense, const char *stuff, struct ast_ha *path, int *error)
{
	struct ast_ha *ha;
	struct ast_ha *prev = NULL;
	struct ast_ha *ret;
	char *tmp, *list = ast_strdupa(stuff);
	char *address = NULL, *mask = NULL;
	int addr_is_v4;
	int allowing = strncasecmp(sense, "p", 1) ? AST_SENSE_DENY : AST_SENSE_ALLOW;

	ret = path;
	while (path) {
		prev = path;
		path = path->next;
	}

	while ((tmp = strsep(&list, ","))) {
		if (!(ha = ast_calloc(1, sizeof(*ha)))) {
			if (error) {
				*error = 1;
			}
			return ret;
		}

		address = strsep(&tmp, "/");
		if (!address) {
			address = tmp;
		} else {
			mask = tmp;
		}

		if (*address == '!') {
			ha->sense = (allowing == AST_SENSE_DENY) ? AST_SENSE_ALLOW : AST_SENSE_DENY;
			address++;
		} else {
			ha->sense = allowing;
		}

		if (!ast_sockaddr_parse(&ha->addr, address, PARSE_PORT_FORBID)) {
			ast_log(LOG_WARNING, "Invalid IP address: %s\n", address);
			ast_free_ha(ha);
			if (error) {
				*error = 1;
			}
			return ret;
		}

		/* If someone specifies an IPv4-mapped IPv6 address,
		 * we just convert this to an IPv4 ACL
		 */
		if (ast_sockaddr_ipv4_mapped(&ha->addr, &ha->addr)) {
			ast_log(LOG_NOTICE, "IPv4-mapped ACL network address specified. "
				"Converting to an IPv4 ACL network address.\n");
		}

		addr_is_v4 = ast_sockaddr_is_ipv4(&ha->addr);

		if (!mask) {
			parse_cidr_mask(&ha->netmask, addr_is_v4, addr_is_v4 ? "32" : "128");
		} else if (strchr(mask, ':') || strchr(mask, '.')) {
			int mask_is_v4;
			/* Mask is of x.x.x.x or x:x:x:x:x:x:x:x variety */
			if (!ast_sockaddr_parse(&ha->netmask, mask, PARSE_PORT_FORBID)) {
				ast_log(LOG_WARNING, "Invalid netmask: %s\n", mask);
				ast_free_ha(ha);
				if (error) {
					*error = 1;
				}
				return ret;
			}
			/* If someone specifies an IPv4-mapped IPv6 netmask,
			 * we just convert this to an IPv4 ACL
			 */
			if (ast_sockaddr_ipv4_mapped(&ha->netmask, &ha->netmask)) {
				ast_log(LOG_NOTICE, "IPv4-mapped ACL netmask specified. "
					"Converting to an IPv4 ACL netmask.\n");
			}
			mask_is_v4 = ast_sockaddr_is_ipv4(&ha->netmask);
			if (addr_is_v4 ^ mask_is_v4) {
				ast_log(LOG_WARNING, "Address and mask are not using same address scheme.\n");
				ast_free_ha(ha);
				if (error) {
					*error = 1;
				}
				return ret;
			}
		} else if (parse_cidr_mask(&ha->netmask, addr_is_v4, mask)) {
			ast_log(LOG_WARNING, "Invalid CIDR netmask: %s\n", mask);
			ast_free_ha(ha);
			if (error) {
				*error = 1;
			}
			return ret;
		}

		if (ast_sockaddr_apply_netmask(&ha->addr, &ha->netmask, &ha->addr)) {
			/* This shouldn't happen because ast_sockaddr_parse would
			 * have failed much earlier on an unsupported address scheme
			 */
			char *failmask = ast_strdupa(ast_sockaddr_stringify(&ha->netmask));
			char *failaddr = ast_strdupa(ast_sockaddr_stringify(&ha->addr));
			ast_log(LOG_WARNING, "Unable to apply netmask %s to address %s\n", failmask, failaddr);
			ast_free_ha(ha);
			if (error) {
				*error = 1;
			}
			return ret;
		}

		if (prev) {
			prev->next = ha;
		} else {
			ret = ha;
		}
		prev = ha;

		if (DEBUG_ATLEAST(3)) {
			debug_ha_sense_appended(ha);
		}
	}

	return ret;
}

void ast_ha_join(const struct ast_ha *ha, struct ast_str **buf)
{
	for (; ha; ha = ha->next) {
		ast_str_append(buf, 0, "%s%s/",
			ha->sense == AST_SENSE_ALLOW ? "!" : "",
			ast_sockaddr_stringify_addr(&ha->addr));
		/* Separated to avoid duplicating stringified addresses. */
		ast_str_append(buf, 0, "%s", ast_sockaddr_stringify_addr(&ha->netmask));
		if (ha->next) {
			ast_str_append(buf, 0, ",");
		}
	}
}

void ast_ha_join_cidr(const struct ast_ha *ha, struct ast_str **buf)
{
	for (; ha; ha = ha->next) {
		const char *addr = ast_sockaddr_stringify_addr(&ha->addr);
		ast_str_append(buf, 0, "%s%s/%d",
			       ha->sense == AST_SENSE_ALLOW ? "!" : "",
			       addr, ast_sockaddr_cidr_bits(&ha->netmask));
		if (ha->next) {
			ast_str_append(buf, 0, ",");
		}
	}
}

enum ast_acl_sense ast_apply_acl(struct ast_acl_list *acl_list, const struct ast_sockaddr *addr, const char *purpose)
{
	struct ast_acl *acl;

	/* If the list is NULL, there are no rules, so we'll allow automatically. */
	if (!acl_list) {
		return AST_SENSE_ALLOW;
	}

	AST_LIST_LOCK(acl_list);

	AST_LIST_TRAVERSE(acl_list, acl, list) {
		if (acl->is_invalid) {
			/* In this case, the baseline ACL shouldn't ever trigger this, but if that somehow happens, it'll still be shown. */
			ast_log(LOG_WARNING, "%sRejecting '%s' due to use of an invalid ACL '%s'.\n", purpose ? purpose : "", ast_sockaddr_stringify_addr(addr),
					ast_strlen_zero(acl->name) ? "(BASELINE)" : acl->name);
			AST_LIST_UNLOCK(acl_list);
			return AST_SENSE_DENY;
		}

		if (acl->acl) {
			if (ast_apply_ha(acl->acl, addr) == AST_SENSE_DENY) {
				ast_log(LOG_NOTICE, "%sRejecting '%s' due to a failure to pass ACL '%s'\n", purpose ? purpose : "", ast_sockaddr_stringify_addr(addr),
						ast_strlen_zero(acl->name) ? "(BASELINE)" : acl->name);
				AST_LIST_UNLOCK(acl_list);
				return AST_SENSE_DENY;
			}
		}
	}

	AST_LIST_UNLOCK(acl_list);

	return AST_SENSE_ALLOW;
}

enum ast_acl_sense ast_apply_ha(const struct ast_ha *ha, const struct ast_sockaddr *addr)
{
	/* Start optimistic */
	enum ast_acl_sense res = AST_SENSE_ALLOW;
	const struct ast_ha *current_ha;

	for (current_ha = ha; current_ha; current_ha = current_ha->next) {
		struct ast_sockaddr result;
		struct ast_sockaddr mapped_addr;
		const struct ast_sockaddr *addr_to_use;
#if 0	/* debugging code */
		char iabuf[INET_ADDRSTRLEN];
		char iabuf2[INET_ADDRSTRLEN];
		/* DEBUG */
		ast_copy_string(iabuf, ast_sockaddr_stringify(addr), sizeof(iabuf));
		ast_copy_string(iabuf2, ast_sockaddr_stringify(&current_ha->addr), sizeof(iabuf2));
		ast_debug(1, "##### Testing %s with %s\n", iabuf, iabuf2);
#endif
		if (ast_sockaddr_is_ipv4(&current_ha->addr)) {
			if (ast_sockaddr_is_ipv6(addr)) {
				if (ast_sockaddr_is_ipv4_mapped(addr)) {
					/* IPv4 ACLs apply to IPv4-mapped addresses */
					if (!ast_sockaddr_ipv4_mapped(addr, &mapped_addr)) {
						ast_log(LOG_ERROR, "%s provided to ast_sockaddr_ipv4_mapped could not be converted. That shouldn't be possible.\n",
							ast_sockaddr_stringify(addr));
						continue;
					}
					addr_to_use = &mapped_addr;
				} else {
					/* An IPv4 ACL does not apply to an IPv6 address */
					continue;
				}
			} else {
				/* Address is IPv4 and ACL is IPv4. No biggie */
				addr_to_use = addr;
			}
		} else {
			if (ast_sockaddr_is_ipv6(addr) && !ast_sockaddr_is_ipv4_mapped(addr)) {
				addr_to_use = addr;
			} else {
				/* Address is IPv4 or IPv4 mapped but ACL is IPv6. Skip */
				continue;
			}
		}

		/* For each rule, if this address and the netmask = the net address
		   apply the current rule */
		if (ast_sockaddr_apply_netmask(addr_to_use, &current_ha->netmask, &result)) {
			/* Unlikely to happen since we know the address to be IPv4 or IPv6 */
			continue;
		}
		if (!ast_sockaddr_cmp_addr(&result, &current_ha->addr)) {
			res = current_ha->sense;
		}
	}
	return res;
}

static int resolve_first(struct ast_sockaddr *addr, const char *name, int flag,
			 int family)
{
	struct ast_sockaddr *addrs;
	int addrs_cnt;

	addrs_cnt = ast_sockaddr_resolve(&addrs, name, flag, family);
	if (addrs_cnt > 0) {
		if (addrs_cnt > 1) {
			ast_debug(1, "Multiple addresses. Using the first only\n");
		}
		ast_sockaddr_copy(addr, &addrs[0]);
		ast_free(addrs);
	} else {
		ast_log(LOG_WARNING, "Unable to lookup '%s'\n", name);
		return -1;
	}

	return 0;
}

int ast_get_ip_or_srv(struct ast_sockaddr *addr, const char *hostname, const char *service)
{
	char srv[256];
	char host[256];
	int srv_ret = 0;
	int tportno;

	if (service) {
		snprintf(srv, sizeof(srv), "%s.%s", service, hostname);
		if ((srv_ret = ast_get_srv(NULL, host, sizeof(host), &tportno, srv)) > 0) {
			hostname = host;
		}
	}

	if (resolve_first(addr, hostname, PARSE_PORT_FORBID, addr->ss.ss_family) != 0) {
		return -1;
	}

	if (srv_ret > 0) {
		ast_sockaddr_set_port(addr, tportno);
	}

	return 0;
}

struct dscp_codepoint {
	char *name;
	unsigned int space;
};

/* IANA registered DSCP codepoints */

static const struct dscp_codepoint dscp_pool1[] = {
	{ "CS0", 0x00 },
	{ "CS1", 0x08 },
	{ "CS2", 0x10 },
	{ "CS3", 0x18 },
	{ "CS4", 0x20 },
	{ "CS5", 0x28 },
	{ "CS6", 0x30 },
	{ "CS7", 0x38 },
	{ "AF11", 0x0A },
	{ "AF12", 0x0C },
	{ "AF13", 0x0E },
	{ "AF21", 0x12 },
	{ "AF22", 0x14 },
	{ "AF23", 0x16 },
	{ "AF31", 0x1A },
	{ "AF32", 0x1C },
	{ "AF33", 0x1E },
	{ "AF41", 0x22 },
	{ "AF42", 0x24 },
	{ "AF43", 0x26 },
	{ "EF", 0x2E },
};

int ast_str2cos(const char *value, unsigned int *cos)
{
	int fval;

	if (sscanf(value, "%30d", &fval) == 1) {
		if (fval < 8) {
		    *cos = fval;
		    return 0;
		}
	}

	return -1;
}

int ast_str2tos(const char *value, unsigned int *tos)
{
	int fval;
	unsigned int x;

	if (sscanf(value, "%30i", &fval) == 1) {
		*tos = fval & 0xFF;
		return 0;
	}

	for (x = 0; x < ARRAY_LEN(dscp_pool1); x++) {
		if (!strcasecmp(value, dscp_pool1[x].name)) {
			*tos = dscp_pool1[x].space << 2;
			return 0;
		}
	}

	return -1;
}

const char *ast_tos2str(unsigned int tos)
{
	unsigned int x;

	for (x = 0; x < ARRAY_LEN(dscp_pool1); x++) {
		if (dscp_pool1[x].space == (tos >> 2)) {
			return dscp_pool1[x].name;
		}
	}

	return "unknown";
}

int ast_get_ip(struct ast_sockaddr *addr, const char *hostname)
{
	return ast_get_ip_or_srv(addr, hostname, NULL);
}

int ast_ouraddrfor(const struct ast_sockaddr *them, struct ast_sockaddr *us)
{
	/*
	 * We must create the errno string before creating the address
	 * string because it could wipe out errno on the error return
	 * paths.
	 */
	const char *sock_err;
	int port;
	int s;

	/* Preserve our original address port */
	port = ast_sockaddr_port(us);

	s = socket(ast_sockaddr_is_ipv6(them) ? AF_INET6 : AF_INET, SOCK_DGRAM, 0);
	if (s < 0) {
		sock_err = ast_strdupa(strerror(errno));
		ast_log(LOG_ERROR, "Cannot create socket to %s: %s\n",
			ast_sockaddr_stringify_addr(them), sock_err);
		return -1;
	}

	if (ast_connect(s, them)) {
		sock_err = ast_strdupa(strerror(errno));
		ast_log(LOG_WARNING, "Cannot connect to %s: %s\n",
			ast_sockaddr_stringify_addr(them), sock_err);
		close(s);
		return -1;
	}
	if (ast_getsockname(s, us)) {
		sock_err = ast_strdupa(strerror(errno));
		ast_log(LOG_WARNING, "Cannot get socket name for connection to %s: %s\n",
			ast_sockaddr_stringify_addr(them), sock_err);
		close(s);
		return -1;
	}
	close(s);

	ast_sockaddr_set_port(us, port);

	ast_debug(3, "For destination '%s', our source address is '%s'.\n",
		ast_strdupa(ast_sockaddr_stringify_addr(them)),
		ast_strdupa(ast_sockaddr_stringify_addr(us)));

	return 0;
}

int ast_find_ourip(struct ast_sockaddr *ourip, const struct ast_sockaddr *bindaddr, int family)
{
	char ourhost[MAXHOSTNAMELEN] = "";
	struct ast_sockaddr root;
	int res, port = ast_sockaddr_port(ourip);

	/* just use the bind address if it is nonzero */
	if (!ast_sockaddr_is_any(bindaddr)) {
		ast_sockaddr_copy(ourip, bindaddr);
		ast_debug(3, "Attached to given IP address\n");
		return 0;
	}
	/* try to use our hostname */
	if (gethostname(ourhost, sizeof(ourhost) - 1)) {
		ast_log(LOG_WARNING, "Unable to get hostname\n");
	} else {
		if (resolve_first(ourip, ourhost, PARSE_PORT_FORBID, family) == 0) {
			/* reset port since resolve_first wipes this out */
			ast_sockaddr_set_port(ourip, port);
			return 0;
		}
	}
	ast_debug(3, "Trying to check A.ROOT-SERVERS.NET and get our IP address for that connection\n");
	/* A.ROOT-SERVERS.NET. */
	if (!resolve_first(&root, "A.ROOT-SERVERS.NET", PARSE_PORT_FORBID, 0) &&
	    !ast_ouraddrfor(&root, ourip)) {
		/* reset port since resolve_first wipes this out */
		ast_sockaddr_set_port(ourip, port);
		return 0;
	}
	res = get_local_address(ourip);
	ast_sockaddr_set_port(ourip, port);
	return res;
}