Linux preempt-rt

Check our new training course

Real-Time Linux with PREEMPT_RT

Check our new training course
with Creative Commons CC-BY-SA
lecture and lab materials

Bootlin logo

Elixir Cross Referencer

  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
/*
 * Copyright (c) 2018 Intel Corporation
 *
 * SPDX-License-Identifier: Apache-2.0
 */

#include <logging/log.h>
LOG_MODULE_REGISTER(net_test, LOG_LEVEL_DBG);

#include <errno.h>
#include <zephyr/types.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdio.h>
#include <string.h>
#include <sys/printk.h>
#include <kernel.h>

#include <net/coap.h>

#include <tc_util.h>
#include <ztest.h>

#include "net_private.h"

#define COAP_BUF_SIZE 128
#define COAP_FIXED_HEADER_SIZE 4

#define NUM_PENDINGS 3
#define NUM_OBSERVERS 3
#define NUM_REPLIES 3

static struct coap_pending pendings[NUM_PENDINGS];
static struct coap_observer observers[NUM_OBSERVERS];
static struct coap_reply replies[NUM_REPLIES];

/* This is exposed for this test in subsys/net/lib/coap/coap_link_format.c */
bool _coap_match_path_uri(const char * const *path,
			  const char *uri, uint16_t len);

/* Some forward declarations */
static void server_notify_callback(struct coap_resource *resource,
				   struct coap_observer *observer);

static int server_resource_1_get(struct coap_resource *resource,
				 struct coap_packet *request,
				 struct sockaddr *addr, socklen_t addr_len);

static const char * const server_resource_1_path[] = { "s", "1", NULL };
static struct coap_resource server_resources[] =  {
	{ .path = server_resource_1_path,
	  .get = server_resource_1_get,
	  .notify = server_notify_callback },
	{ },
};

#define MY_PORT 12345
#define peer_addr { { { 0x20, 0x01, 0x0d, 0xb8, 0, 0, 0, 0, \
			0, 0, 0, 0, 0, 0, 0, 0x2 } } }
static struct sockaddr_in6 dummy_addr = {
	.sin6_family = AF_INET6,
	.sin6_addr = peer_addr };

static uint8_t data_buf[2][COAP_BUF_SIZE];

static void test_build_empty_pdu(void)
{
	uint8_t result_pdu[] = { 0x40, 0x01, 0x0, 0x0 };
	struct coap_packet cpkt;
	uint8_t *data = data_buf[0];
	int r;

	r = coap_packet_init(&cpkt, data, COAP_BUF_SIZE,
			     COAP_VERSION_1, COAP_TYPE_CON, 0, NULL,
			     COAP_METHOD_GET, 0);

	zassert_equal(r, 0, "Could not initialize packet");
	zassert_equal(cpkt.offset, sizeof(result_pdu),
		     "Different size from the reference packet");
	zassert_equal(cpkt.hdr_len, COAP_FIXED_HEADER_SIZE,
		      "Invalid header length");
	zassert_equal(cpkt.opt_len, 0, "Invalid options length");
	zassert_mem_equal(result_pdu, cpkt.data, cpkt.offset,
			  "Built packet doesn't match reference packet");
}

static void test_build_simple_pdu(void)
{
	uint8_t result_pdu[] = { 0x55, 0xA5, 0x12, 0x34, 't', 'o', 'k', 'e',
				 'n', 0xC0, 0xFF, 'p', 'a', 'y', 'l',
				 'o', 'a', 'd', 0x00 };
	struct coap_packet cpkt;
	const char token[] = "token";
	static const char payload[] = "payload";
	uint8_t *data = data_buf[0];
	const uint8_t *payload_start;
	uint16_t payload_len;
	int r;

	r = coap_packet_init(&cpkt, data, COAP_BUF_SIZE,
			     COAP_VERSION_1, COAP_TYPE_NON_CON,
			     strlen(token), token,
			     COAP_RESPONSE_CODE_PROXYING_NOT_SUPPORTED,
			     0x1234);
	zassert_equal(r, 0, "Could not initialize packet");

	r = coap_append_option_int(&cpkt, COAP_OPTION_CONTENT_FORMAT,
				   COAP_CONTENT_FORMAT_TEXT_PLAIN);
	zassert_equal(r, 0, "Could not append option");

	r = coap_packet_append_payload_marker(&cpkt);
	zassert_equal(r, 0, "Failed to set the payload marker");

	r = coap_packet_append_payload(&cpkt, payload, sizeof(payload));
	zassert_equal(r, 0, "Failed to set the payload");

	zassert_equal(cpkt.offset, sizeof(result_pdu),
		     "Different size from the reference packet");
	zassert_equal(cpkt.hdr_len, COAP_FIXED_HEADER_SIZE + strlen(token),
		      "Invalid header length");
	zassert_equal(cpkt.opt_len, 1, "Invalid options length");
	zassert_mem_equal(result_pdu, cpkt.data, cpkt.offset,
			  "Built packet doesn't match reference packet");

	payload_start = coap_packet_get_payload(&cpkt, &payload_len);

	zassert_equal(payload_len, sizeof(payload), "Invalid payload length");
	zassert_equal_ptr(payload_start, cpkt.data + cpkt.offset - payload_len,
			  "Invalid payload pointer");
}

/* No options, No payload */
static void test_parse_empty_pdu(void)
{
	uint8_t pdu[] = { 0x40, 0x01, 0, 0 };
	struct coap_packet cpkt;
	uint8_t *data = data_buf[0];
	uint8_t ver;
	uint8_t type;
	uint8_t code;
	uint16_t id;
	int r;

	memcpy(data, pdu, sizeof(pdu));

	r = coap_packet_parse(&cpkt, data, sizeof(pdu), NULL, 0);
	zassert_equal(r, 0, "Could not parse packet");

	zassert_equal(cpkt.offset, sizeof(pdu),
		     "Different size from the reference packet");
	zassert_equal(cpkt.hdr_len, COAP_FIXED_HEADER_SIZE,
		      "Invalid header length");
	zassert_equal(cpkt.opt_len, 0, "Invalid options length");

	ver = coap_header_get_version(&cpkt);
	type = coap_header_get_type(&cpkt);
	code = coap_header_get_code(&cpkt);
	id = coap_header_get_id(&cpkt);

	zassert_equal(ver, 1U, "Invalid version for parsed packet");
	zassert_equal(type, COAP_TYPE_CON,
		      "Packet type doesn't match reference");
	zassert_equal(code, COAP_METHOD_GET,
		      "Packet code doesn't match reference");
	zassert_equal(id, 0U, "Packet id doesn't match reference");
}

/* 1 option, No payload (No payload marker) */
static void test_parse_empty_pdu_1(void)
{
	uint8_t pdu[] = { 0x40, 0x01, 0, 0, 0x40};
	struct coap_packet cpkt;
	uint8_t *data = data_buf[0];
	uint8_t ver;
	uint8_t type;
	uint8_t code;
	uint16_t id;
	int r;

	memcpy(data, pdu, sizeof(pdu));

	r = coap_packet_parse(&cpkt, data, sizeof(pdu), NULL, 0);
	zassert_equal(r, 0, "Could not parse packet");

	zassert_equal(cpkt.offset, sizeof(pdu),
		     "Different size from the reference packet");
	zassert_equal(cpkt.hdr_len, COAP_FIXED_HEADER_SIZE,
		      "Invalid header length");
	zassert_equal(cpkt.opt_len, 1, "Invalid options length");

	ver = coap_header_get_version(&cpkt);
	type = coap_header_get_type(&cpkt);
	code = coap_header_get_code(&cpkt);
	id = coap_header_get_id(&cpkt);

	zassert_equal(ver, 1U, "Invalid version for parsed packet");
	zassert_equal(type, COAP_TYPE_CON,
		      "Packet type doesn't match reference");
	zassert_equal(code, COAP_METHOD_GET,
		      "Packet code doesn't match reference");
	zassert_equal(id, 0U, "Packet id doesn't match reference");
}

static void test_parse_simple_pdu(void)
{
	uint8_t pdu[] = { 0x55, 0xA5, 0x12, 0x34, 't', 'o', 'k', 'e', 'n',
		       0x00, 0xc1, 0x00, 0xff, 'p', 'a', 'y', 'l', 'o',
		       'a', 'd', 0x00 };
	struct coap_packet cpkt;
	struct coap_option options[16] = {};
	const uint8_t token[8];
	const uint8_t payload[] = "payload";
	uint8_t *data = data_buf[0];
	uint8_t ver;
	uint8_t type;
	uint8_t code;
	uint8_t tkl;
	uint16_t id;
	const uint8_t *payload_start;
	uint16_t payload_len;
	int r, count = ARRAY_SIZE(options) - 1;

	memcpy(data, pdu, sizeof(pdu));

	r = coap_packet_parse(&cpkt, data, sizeof(pdu), NULL, 0);
	zassert_equal(r, 0, "Could not parse packet");

	zassert_equal(cpkt.offset, sizeof(pdu),
		     "Different size from the reference packet");
	zassert_equal(cpkt.hdr_len, COAP_FIXED_HEADER_SIZE + strlen("token"),
		      "Invalid header length");
	zassert_equal(cpkt.opt_len, 3, "Invalid options length");

	payload_start = coap_packet_get_payload(&cpkt, &payload_len);

	zassert_equal(payload_len, sizeof(payload), "Invalid payload length");
	zassert_equal_ptr(payload_start, cpkt.data + cpkt.offset - payload_len,
			  "Invalid payload pointer");

	ver = coap_header_get_version(&cpkt);
	type = coap_header_get_type(&cpkt);
	code = coap_header_get_code(&cpkt);
	id = coap_header_get_id(&cpkt);

	zassert_equal(ver, 1U, "Invalid version for parsed packet");
	zassert_equal(type, COAP_TYPE_NON_CON,
		      "Packet type doesn't match reference");
	zassert_equal(code, COAP_RESPONSE_CODE_PROXYING_NOT_SUPPORTED,
		      "Packet code doesn't match reference");
	zassert_equal(id, 0x1234, "Packet id doesn't match reference");

	tkl = coap_header_get_token(&cpkt, (uint8_t *)token);

	zassert_equal(tkl, 5U, "Token length doesn't match reference");
	zassert_mem_equal(token, "token", tkl,
			  "Token value doesn't match the reference");

	count = coap_find_options(&cpkt, COAP_OPTION_CONTENT_FORMAT,
				   options, count);

	zassert_equal(count, 1, "Unexpected number of options in the packet");
	zassert_equal(options[0].len, 1U,
		     "Option length doesn't match the reference");
	zassert_equal(((uint8_t *)options[0].value)[0],
		      COAP_CONTENT_FORMAT_TEXT_PLAIN,
		      "Option value doesn't match the reference");

	/* Not existent */
	count = coap_find_options(&cpkt, COAP_OPTION_ETAG, options, count);

	zassert_equal(count, 0,
		      "There shouldn't be any ETAG option in the packet");
}

static void test_parse_malformed_opt(void)
{
	uint8_t opt[] = { 0x55, 0xA5, 0x12, 0x34, 't', 'o', 'k', 'e', 'n',
		       0xD0 };
	struct coap_packet cpkt;
	uint8_t *data = data_buf[0];
	int r;

	memcpy(data, opt, sizeof(opt));

	r = coap_packet_parse(&cpkt, data, sizeof(opt), NULL, 0);
	zassert_not_equal(r, 0, "Should've failed to parse a packet");
}

static void test_parse_malformed_opt_len(void)
{
	uint8_t opt[] = { 0x55, 0xA5, 0x12, 0x34, 't', 'o', 'k', 'e', 'n',
		       0xC1 };
	struct coap_packet cpkt;
	uint8_t *data = data_buf[0];
	int r;

	memcpy(data, opt, sizeof(opt));

	r = coap_packet_parse(&cpkt, data, sizeof(opt), NULL, 0);
	zassert_not_equal(r, 0, "Should've failed to parse a packet");
}

static void test_parse_malformed_opt_ext(void)
{
	uint8_t opt[] = { 0x55, 0xA5, 0x12, 0x34, 't', 'o', 'k', 'e', 'n',
		       0xE0, 0x01 };
	struct coap_packet cpkt;
	uint8_t *data = data_buf[0];
	int r;

	memcpy(data, opt, sizeof(opt));

	r = coap_packet_parse(&cpkt, data, sizeof(opt), NULL, 0);
	zassert_not_equal(r, 0, "Should've failed to parse a packet");
}

static void test_parse_malformed_opt_len_ext(void)
{
	uint8_t opt[] = { 0x55, 0xA5, 0x12, 0x34, 't', 'o', 'k', 'e', 'n',
		       0xEE, 0x01, 0x02, 0x01};
	struct coap_packet cpkt;
	uint8_t *data = data_buf[0];
	int r;

	memcpy(data, opt, sizeof(opt));

	r = coap_packet_parse(&cpkt, data, sizeof(opt), NULL, 0);
	zassert_not_equal(r, 0, "Should've failed to parse a packet");
}

/* 1 option, No payload (with payload marker) */
static void test_parse_malformed_marker(void)
{
	uint8_t pdu[] = { 0x40, 0x01, 0, 0, 0x40, 0xFF};
	struct coap_packet cpkt;
	uint8_t *data = data_buf[0];
	int r;

	memcpy(data, pdu, sizeof(pdu));

	r = coap_packet_parse(&cpkt, data, sizeof(pdu), NULL, 0);
	zassert_not_equal(r, 0, "Should've failed to parse a packet");
}

static void test_parse_req_build_ack(void)
{
	uint8_t pdu[] = { 0x45, 0xA5, 0x12, 0x34, 't', 'o', 'k', 'e', 'n',
		       0x00, 0xc1, 0x00, 0xff, 'p', 'a', 'y', 'l', 'o',
		       'a', 'd', 0x00 };
	uint8_t ack_pdu[] = { 0x65, 0x80, 0x12, 0x34, 't', 'o', 'k', 'e', 'n' };
	struct coap_packet cpkt;
	struct coap_packet ack_cpkt;
	uint8_t *data = data_buf[0];
	uint8_t *ack_data = data_buf[1];
	int r;

	memcpy(data, pdu, sizeof(pdu));

	r = coap_packet_parse(&cpkt, data, sizeof(pdu), NULL, 0);
	zassert_equal(r, 0, "Could not parse packet");

	r = coap_ack_init(&ack_cpkt, &cpkt, ack_data, COAP_BUF_SIZE,
			  COAP_RESPONSE_CODE_BAD_REQUEST);
	zassert_equal(r, 0, "Could not initialize ACK packet");

	zassert_equal(ack_cpkt.offset, sizeof(ack_pdu),
		     "Different size from the reference packet");
	zassert_mem_equal(ack_pdu, ack_cpkt.data, ack_cpkt.offset,
			  "Built packet doesn't match reference packet");
}

static void test_parse_req_build_empty_ack(void)
{
	uint8_t pdu[] = { 0x45, 0xA5, 0xDE, 0xAD, 't', 'o', 'k', 'e', 'n',
		       0x00, 0xc1, 0x00, 0xff, 'p', 'a', 'y', 'l', 'o',
		       'a', 'd', 0x00 };
	uint8_t ack_pdu[] = { 0x60, 0x00, 0xDE, 0xAD };
	struct coap_packet cpkt;
	struct coap_packet ack_cpkt;
	uint8_t *data = data_buf[0];
	uint8_t *ack_data = data_buf[1];
	int r;

	memcpy(data, pdu, sizeof(pdu));

	r = coap_packet_parse(&cpkt, data, sizeof(pdu), NULL, 0);
	zassert_equal(r, 0, "Could not parse packet");

	r = coap_ack_init(&ack_cpkt, &cpkt, ack_data, COAP_BUF_SIZE,
			  COAP_CODE_EMPTY);
	zassert_equal(r, 0, "Could not initialize ACK packet");

	zassert_equal(ack_cpkt.offset, sizeof(ack_pdu),
		      "Different size from the reference packet");
	zassert_mem_equal(ack_pdu, ack_cpkt.data, ack_cpkt.offset,
			  "Built packet doesn't match reference packet");
}

static void test_match_path_uri(void)
{
	const char * const resource_path[] = {
		"s",
		"1",
		"foobar",
		"foobar3a",
		"foobar3",
		"devnull",
		NULL
	};
	const char *uri;
	int r;

	uri = "/k";
	r = _coap_match_path_uri(resource_path, uri, strlen(uri));
	zassert_false(r, "Matching %s failed", uri);

	uri = "/s";
	r = _coap_match_path_uri(resource_path, uri, strlen(uri));
	zassert_true(r, "Matching %s failed", uri);

	uri = "/foobar";
	r = _coap_match_path_uri(resource_path, uri, strlen(uri));
	zassert_true(r, "Matching %s failed", uri);

	uri = "/foobar2";
	r = _coap_match_path_uri(resource_path, uri, strlen(uri));
	zassert_false(r, "Matching %s failed", uri);

	uri = "/foobar*";
	r = _coap_match_path_uri(resource_path, uri, strlen(uri));
	zassert_true(r, "Matching %s failed", uri);

	uri = "/foobar3*";
	r = _coap_match_path_uri(resource_path, uri, strlen(uri));
	zassert_true(r, "Matching %s failed", uri);

	uri = "/devnull*";
	r = _coap_match_path_uri(resource_path, uri, strlen(uri));
	zassert_false(r, "Matching %s failed", uri);
}

#define BLOCK_WISE_TRANSFER_SIZE_GET 128

static void prepare_block1_request(struct coap_packet *req,
				   struct coap_block_context *req_ctx,
				   int *more)
{
	const char token[] = "token";
	uint8_t payload[32] = { 0 };
	uint8_t *data = data_buf[0];
	bool first;
	int r;

	/* Request Context */
	if (req_ctx->total_size == 0) {
		first = true;
		coap_block_transfer_init(req_ctx, COAP_BLOCK_32,
					 BLOCK_WISE_TRANSFER_SIZE_GET);
	} else {
		first = false;
	}

	r = coap_packet_init(req, data, COAP_BUF_SIZE, COAP_VERSION_1,
			     COAP_TYPE_CON, strlen(token),
			     token, COAP_METHOD_POST,
			     coap_next_id());
	zassert_equal(r, 0, "Unable to initialize request");

	r = coap_append_block1_option(req, req_ctx);
	zassert_equal(r, 0, "Unable to append block1 option");

	if (first) {
		r = coap_append_size1_option(req, req_ctx);
		zassert_equal(r, 0, "Unable to append size1 option");
	}

	r = coap_packet_append_payload_marker(req);
	zassert_equal(r, 0, "Unable to append payload marker");

	r = coap_packet_append_payload(req, payload,
				       coap_block_size_to_bytes(COAP_BLOCK_32));
	zassert_equal(r, 0, "Unable to append payload");

	*more = coap_next_block(req, req_ctx);
}

static void prepare_block1_response(struct coap_packet *rsp,
				    struct coap_block_context *rsp_ctx,
				    struct coap_packet *req)
{
	uint8_t token[8];
	uint8_t *data = data_buf[1];
	uint16_t id;
	uint8_t tkl;
	int r;

	if (rsp_ctx->total_size == 0) {
		coap_block_transfer_init(rsp_ctx, COAP_BLOCK_32,
					 BLOCK_WISE_TRANSFER_SIZE_GET);
	}

	r = coap_update_from_block(req, rsp_ctx);
	zassert_equal(r, 0, "Failed to read block option");

	id = coap_header_get_id(req);
	tkl = coap_header_get_token(req, token);

	r = coap_packet_init(rsp, data, COAP_BUF_SIZE, COAP_VERSION_1,
			     COAP_TYPE_ACK, tkl, token,
			     COAP_RESPONSE_CODE_CREATED, id);
	zassert_equal(r, 0, "Unable to initialize request");

	r = coap_append_block1_option(rsp, rsp_ctx);
	zassert_equal(r, 0, "Unable to append block1 option");
}

static void verify_block1_request(struct coap_block_context *req_ctx,
				  uint8_t iter)
{
	zassert_equal(req_ctx->block_size, COAP_BLOCK_32,
		      "req:%d,Couldn't get block size", iter);

	/* In last iteration "current" field not updated */
	if (iter < 4) {
		zassert_equal(
			req_ctx->current,
			coap_block_size_to_bytes(COAP_BLOCK_32) * iter,
			"req:%d,Couldn't get the current block position", iter);
	} else {
		zassert_equal(
			req_ctx->current,
			coap_block_size_to_bytes(COAP_BLOCK_32) * (iter - 1U),
			"req:%d,Couldn't get the current block position", iter);
	}

	zassert_equal(req_ctx->total_size, BLOCK_WISE_TRANSFER_SIZE_GET,
		      "req:%d,Couldn't packet total size", iter);
}

static void verify_block1_response(struct coap_block_context *rsp_ctx,
				   uint8_t iter)
{
	zassert_equal(rsp_ctx->block_size, COAP_BLOCK_32,
		      "rsp:%d,Couldn't get block size", iter);
	zassert_equal(rsp_ctx->current,
		      coap_block_size_to_bytes(COAP_BLOCK_32) * (iter - 1U),
		      "rsp:%d, Couldn't get the current block position", iter);
	zassert_equal(rsp_ctx->total_size, BLOCK_WISE_TRANSFER_SIZE_GET,
		      "rsp:%d, Couldn't packet total size", iter);
}

static void test_block1_size(void)
{
	struct coap_block_context req_ctx;
	struct coap_block_context rsp_ctx;
	struct coap_packet req;
	struct coap_packet rsp;
	int more;
	uint8_t i;

	i = 0U;
	more = 1;
	memset(&req_ctx, 0, sizeof(req_ctx));
	memset(&rsp_ctx, 0, sizeof(rsp_ctx));

	while (more) {
		prepare_block1_request(&req, &req_ctx, &more);
		prepare_block1_response(&rsp, &rsp_ctx, &req);

		i++;

		verify_block1_request(&req_ctx, i);
		verify_block1_response(&rsp_ctx, i);
	}
}

#define BLOCK2_WISE_TRANSFER_SIZE_GET 256

static void prepare_block2_request(struct coap_packet *req,
				   struct coap_block_context *req_ctx,
				   struct coap_packet *rsp)
{
	const char token[] = "token";
	uint8_t *data = data_buf[0];
	int r;

	/* Request Context */
	if (req_ctx->total_size == 0) {
		coap_block_transfer_init(req_ctx, COAP_BLOCK_64,
					 BLOCK2_WISE_TRANSFER_SIZE_GET);
	} else {
		coap_next_block(rsp, req_ctx);
	}

	r = coap_packet_init(req, data, COAP_BUF_SIZE, COAP_VERSION_1,
			     COAP_TYPE_CON, strlen(token),
			     token, COAP_METHOD_GET,
			     coap_next_id());
	zassert_equal(r, 0, "Unable to initialize request");

	r = coap_append_block2_option(req, req_ctx);
	zassert_equal(r, 0, "Unable to append block2 option");
}

static void prepare_block2_response(struct coap_packet *rsp,
				   struct coap_block_context *rsp_ctx,
				   struct coap_packet *req,
				   int *more)
{
	uint8_t payload[64];
	uint8_t token[8];
	uint8_t *data = data_buf[1];
	uint16_t id;
	uint8_t tkl;
	bool first;
	int r;

	if (rsp_ctx->total_size == 0) {
		first = true;
		coap_block_transfer_init(rsp_ctx, COAP_BLOCK_64,
					 BLOCK2_WISE_TRANSFER_SIZE_GET);
	} else {
		first = false;
	}

	id = coap_header_get_id(req);
	tkl = coap_header_get_token(req, token);

	r = coap_packet_init(rsp, data, COAP_BUF_SIZE, COAP_VERSION_1,
			     COAP_TYPE_ACK, tkl, token,
			     COAP_RESPONSE_CODE_CONTENT, id);
	zassert_equal(r, 0, "Unable to initialize request");

	r = coap_append_block2_option(rsp, rsp_ctx);
	zassert_equal(r, 0, "Unable to append block2 option");

	if (first) {
		r = coap_append_size2_option(rsp, rsp_ctx);
		zassert_equal(r, 0, "Unable to append size2 option");
	}

	r = coap_packet_append_payload_marker(rsp);
	zassert_equal(r, 0, "Unable to append payload marker");

	r = coap_packet_append_payload(rsp, payload,
				       coap_block_size_to_bytes(COAP_BLOCK_64));
	zassert_equal(r, 0, "Unable to append payload");

	*more = coap_next_block(rsp, rsp_ctx);
}

static void verify_block2_request(struct coap_block_context *req_ctx,
				 uint8_t iter)
{
	zassert_equal(req_ctx->block_size, COAP_BLOCK_64,
		      "req:%d,Couldn't get block size", iter);
	zassert_equal(req_ctx->current,
		      coap_block_size_to_bytes(COAP_BLOCK_64) * (iter - 1U),
		      "req:%d, Couldn't get the current block position", iter);
	zassert_equal(req_ctx->total_size, BLOCK2_WISE_TRANSFER_SIZE_GET,
		      "req:%d,Couldn't packet total size", iter);
}

static void verify_block2_response(struct coap_block_context *rsp_ctx,
				  uint8_t iter)
{
	zassert_equal(rsp_ctx->block_size, COAP_BLOCK_64,
		      "rsp:%d,Couldn't get block size", iter);

	/* In last iteration "current" field not updated */
	if (iter < 4) {
		zassert_equal(
			rsp_ctx->current,
			coap_block_size_to_bytes(COAP_BLOCK_64) * iter,
			"req:%d,Couldn't get the current block position", iter);
	} else {
		zassert_equal(
			rsp_ctx->current,
			coap_block_size_to_bytes(COAP_BLOCK_64) * (iter - 1U),
			"req:%d,Couldn't get the current block position", iter);
	}

	zassert_equal(rsp_ctx->total_size, BLOCK2_WISE_TRANSFER_SIZE_GET,
		      "rsp:%d, Couldn't packet total size", iter);
}

static void test_block2_size(void)
{
	struct coap_block_context req_ctx;
	struct coap_block_context rsp_ctx;
	struct coap_packet req;
	struct coap_packet rsp;
	int more;
	uint8_t i;

	i = 0U;
	more = 1;
	memset(&req_ctx, 0, sizeof(req_ctx));
	memset(&rsp_ctx, 0, sizeof(rsp_ctx));

	while (more) {
		prepare_block2_request(&req, &req_ctx, &rsp);
		prepare_block2_response(&rsp, &rsp_ctx, &req, &more);

		i++;

		verify_block2_request(&req_ctx, i);
		verify_block2_response(&rsp_ctx, i);
	}
}

static void test_retransmit_second_round(void)
{
	struct coap_packet cpkt;
	struct coap_packet rsp;
	struct coap_pending *pending;
	struct coap_pending *rsp_pending;
	uint8_t *data = data_buf[0];
	uint8_t *rsp_data = data_buf[1];
	int r;
	uint16_t id;

	id = coap_next_id();

	r = coap_packet_init(&cpkt, data, COAP_BUF_SIZE, COAP_VERSION_1,
			     COAP_TYPE_CON, 0, coap_next_token(),
			     COAP_METHOD_GET, id);
	zassert_equal(r, 0, "Could not initialize packet");

	pending = coap_pending_next_unused(pendings, NUM_PENDINGS);
	zassert_not_null(pending, "No free pending");

	r = coap_pending_init(pending, &cpkt, (struct sockaddr *) &dummy_addr,
			      COAP_DEFAULT_MAX_RETRANSMIT);
	zassert_equal(r, 0, "Could not initialize packet");

	/* We "send" the packet the first time here */
	zassert_true(coap_pending_cycle(pending), "Pending expired too early");

	/* We simulate that the first transmission got lost */
	zassert_true(coap_pending_cycle(pending), "Pending expired too early");

	r = coap_packet_init(&rsp, rsp_data, COAP_BUF_SIZE,
			     COAP_VERSION_1, COAP_TYPE_ACK, 0, NULL,
			     COAP_METHOD_GET, id);
	zassert_equal(r, 0, "Could not initialize packet");

	/* Now we get the ack from the remote side */
	rsp_pending = coap_pending_received(&rsp, pendings, NUM_PENDINGS);
	zassert_equal_ptr(pending, rsp_pending,
			  "Invalid pending %p should be %p",
			  rsp_pending, pending);

	coap_pending_clear(rsp_pending);

	rsp_pending = coap_pending_next_to_expire(pendings, NUM_PENDINGS);
	zassert_is_null(rsp_pending, "There should be no active pendings");
}

static bool ipaddr_cmp(const struct sockaddr *a, const struct sockaddr *b)
{
	if (a->sa_family != b->sa_family) {
		return false;
	}

	if (a->sa_family == AF_INET6) {
		return net_ipv6_addr_cmp(&net_sin6(a)->sin6_addr,
					 &net_sin6(b)->sin6_addr);
	} else if (a->sa_family == AF_INET) {
		return net_ipv4_addr_cmp(&net_sin(a)->sin_addr,
					 &net_sin(b)->sin_addr);
	}

	return false;
}

static void server_notify_callback(struct coap_resource *resource,
				   struct coap_observer *observer)
{
	bool r;

	r = ipaddr_cmp(&observer->addr, (const struct sockaddr *)&dummy_addr);
	zassert_true(r, "The address of the observer doesn't match");

	coap_remove_observer(resource, observer);
}

static int server_resource_1_get(struct coap_resource *resource,
				 struct coap_packet *request,
				 struct sockaddr *addr, socklen_t addr_len)
{
	struct coap_packet response;
	struct coap_observer *observer;
	uint8_t *data = data_buf[1];
	char payload[] = "This is the payload";
	uint8_t token[8];
	uint8_t tkl;
	uint16_t id;
	int r;

	zassert_true(coap_request_is_observe(request),
		     "The request should enable observing");

	observer = coap_observer_next_unused(observers, NUM_OBSERVERS);
	zassert_not_null(observer, "There should be an available observer");

	tkl = coap_header_get_token(request, (uint8_t *) token);
	id = coap_header_get_id(request);

	coap_observer_init(observer, request, addr);
	coap_register_observer(resource, observer);

	r = coap_packet_init(&response, data, COAP_BUF_SIZE,
			     COAP_VERSION_1, COAP_TYPE_ACK, tkl, token,
			     COAP_RESPONSE_CODE_OK, id);
	zassert_equal(r, 0, "Unable to initialize packet");

	r = coap_append_option_int(&response, COAP_OPTION_OBSERVE,
				   resource->age);
	zassert_equal(r, 0, "Failed to append observe option");

	r = coap_packet_append_payload_marker(&response);
	zassert_equal(r, 0, "Failed to set the payload marker");

	r = coap_packet_append_payload(&response, (uint8_t *)payload,
				       strlen(payload));
	zassert_equal(r, 0, "Unable to append payload");

	resource->user_data = data;

	return 0;
}

static void test_observer_server(void)
{
	uint8_t valid_request_pdu[] = {
		0x45, 0x01, 0x12, 0x34,
		't', 'o', 'k', 'e', 'n',
		0x60, /* enable observe option */
		0x51, 's', 0x01, '1', /* path */
	};
	uint8_t not_found_request_pdu[] = {
		0x45, 0x01, 0x12, 0x34,
		't', 'o', 'k', 'e', 'n',
		0x60, /* enable observe option */
		0x51, 's', 0x01, '2', /* path */
	};
	struct coap_packet req;
	struct coap_option options[4] = {};
	uint8_t *data = data_buf[0];
	uint8_t opt_num = ARRAY_SIZE(options) - 1;
	int r;

	memcpy(data, valid_request_pdu, sizeof(valid_request_pdu));

	r = coap_packet_parse(&req, data, sizeof(valid_request_pdu),
			      options, opt_num);
	zassert_equal(r, 0, "Could not initialize packet");

	r = coap_handle_request(&req, server_resources, options, opt_num,
				(struct sockaddr *) &dummy_addr,
				sizeof(dummy_addr));
	zassert_equal(r, 0, "Could not handle packet");

	/* Suppose some time passes */
	r = coap_resource_notify(&server_resources[0]);
	zassert_equal(r, 0, "Could not notify resource");

	memcpy(data, not_found_request_pdu, sizeof(not_found_request_pdu));

	r = coap_packet_parse(&req, data, sizeof(not_found_request_pdu),
			      options, opt_num);
	zassert_equal(r, 0, "Could not initialize packet");

	r = coap_handle_request(&req, server_resources, options, opt_num,
				(struct sockaddr *) &dummy_addr,
				sizeof(dummy_addr));
	zassert_equal(r, -ENOENT,
		      "There should be no handler for this resource");
}

static int resource_reply_cb(const struct coap_packet *response,
			     struct coap_reply *reply,
			     const struct sockaddr *from)
{
	TC_PRINT("You should see this");

	return 0;
}

static void test_observer_client(void)
{
	struct coap_packet req;
	struct coap_packet rsp;
	struct coap_reply *reply;
	struct coap_option options[4] = {};
	const char token[] = "token";
	const char * const *p;
	uint8_t *data = data_buf[0];
	uint8_t *rsp_data = data_buf[1];
	uint8_t opt_num = ARRAY_SIZE(options) - 1;
	int observe = 0;
	int r;

	r = coap_packet_init(&req, data, COAP_BUF_SIZE,
			     COAP_VERSION_1, COAP_TYPE_CON,
			     strlen(token), token,
			     COAP_METHOD_GET, coap_next_id());
	zassert_equal(r, 0, "Unable to initialize request");

	/* Enable observing the resource. */
	r = coap_append_option_int(&req, COAP_OPTION_OBSERVE, observe);
	zassert_equal(r, 0, "Unable to add option to request int");

	for (p = server_resource_1_path; p && *p; p++) {
		r = coap_packet_append_option(&req, COAP_OPTION_URI_PATH,
					      *p, strlen(*p));
		zassert_equal(r, 0, "Unable to add option to request");
	}

	reply = coap_reply_next_unused(replies, NUM_REPLIES);
	zassert_not_null(reply, "No resources for waiting for replies");

	coap_reply_init(reply, &req);
	reply->reply = resource_reply_cb;

	/* Server side, not interesting for this test */
	r = coap_packet_parse(&req, data, req.offset, options, opt_num);
	zassert_equal(r, 0, "Could not parse req packet");

	r = coap_handle_request(&req, server_resources, options, opt_num,
				(struct sockaddr *) &dummy_addr,
				sizeof(dummy_addr));
	zassert_equal(r, 0, "Could not handle packet");

	/* We cheat, and communicate using the resource's user_data */
	rsp_data = server_resources[0].user_data;

	/* 'rsp_pkt' contains the response now */

	r = coap_packet_parse(&rsp, rsp_data, req.offset, options, opt_num);
	zassert_equal(r, 0, "Could not parse rsp packet");

	reply = coap_response_received(&rsp,
				       (const struct sockaddr *) &dummy_addr,
				       replies, NUM_REPLIES);
	zassert_not_null(reply, "Couldn't find a matching waiting reply");
}

void test_main(void)
{
	ztest_test_suite(coap_tests,
			 ztest_unit_test(test_build_empty_pdu),
			 ztest_unit_test(test_build_simple_pdu),
			 ztest_unit_test(test_parse_empty_pdu),
			 ztest_unit_test(test_parse_empty_pdu_1),
			 ztest_unit_test(test_parse_simple_pdu),
			 ztest_unit_test(test_parse_malformed_opt),
			 ztest_unit_test(test_parse_malformed_opt_len),
			 ztest_unit_test(test_parse_malformed_opt_ext),
			 ztest_unit_test(test_parse_malformed_opt_len_ext),
			 ztest_unit_test(test_parse_malformed_marker),
			 ztest_unit_test(test_parse_req_build_ack),
			 ztest_unit_test(test_parse_req_build_empty_ack),
			 ztest_unit_test(test_match_path_uri),
			 ztest_unit_test(test_block1_size),
			 ztest_unit_test(test_block2_size),
			 ztest_unit_test(test_retransmit_second_round),
			 ztest_unit_test(test_observer_server),
			 ztest_unit_test(test_observer_client));

	ztest_run_test_suite(coap_tests);
}