-
Notifications
You must be signed in to change notification settings - Fork 3
/
dctt.c
1282 lines (1215 loc) · 35.5 KB
/
dctt.c
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
/*-
* Copyright (C) 2012, 2016 Michael Tuexen
* Copyright (C) 2012 Irene Ruengeler
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the project nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/select.h>
#include <netinet/in.h>
#include <netinet/sctp.h>
#include <arpa/inet.h>
#include <assert.h>
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#define LINE_LENGTH (1024)
#define BUFFER_SIZE (1<<16)
#define NUMBER_OF_CHANNELS (100)
#define NUMBER_OF_STREAMS (100)
#define DATA_CHANNEL_PPID_CONTROL 50
#define DATA_CHANNEL_PPID_DOMSTRING 51
#define DATA_CHANNEL_PPID_BINARY 52
/* As specified in the W3C specification */
#define DATA_CHANNEL_CONNECTING 1
#define DATA_CHANNEL_OPEN 2
#define DATA_CHANNEL_CLOSING 3
#define DATA_CHANNEL_CLOSED 4
#define DATA_CHANNEL_FLAGS_SEND_REQ 0x00000001
#define DATA_CHANNEL_FLAGS_SEND_ACK 0x00000002
#define DATA_CHANNEL_FLAGS_I_RESET 0x00000004
#define DATA_CHANNEL_FLAGS_O_RESET 0x00000008
struct channel {
uint16_t sid;
uint16_t pr_policy;
uint32_t pr_value;
uint8_t unordered;
uint8_t type;
uint16_t priority;
char *label;
char *protocol;
uint8_t state;
uint32_t flags;
};
struct peer_connection {
struct channel channels[NUMBER_OF_CHANNELS];
pthread_mutex_t mutex;
int fd;
int client;
} peer_connection;
#define DATA_CHANNEL_ACK_MESSAGE_TYPE 2
#define DATA_CHANNEL_OPEN_MESSAGE_TYPE 3
#define DATA_CHANNEL_RELIABLE 0x00
#define DATA_CHANNEL_PARTIAL_RELIABLE_REXMIT 0x01
#define DATA_CHANNEL_PARTIAL_RELIABLE_TIMED 0x02
#define DATA_CHANNEL_RELIABLE_UNORDERED 0x80
#define DATA_CHANNEL_PARTIAL_RELIABLE_REXMIT_UNORDERED 0x81
#define DATA_CHANNEL_PARTIAL_RELIABLE_TIMED_UNORDERED 0x82
#define DATA_CHANNEL_UNORDERED 0x80
struct rtcweb_datachannel_open {
uint8_t message_type; /* DATA_CHANNEL_OPEN */
uint8_t channel_type;
uint16_t priority;
uint32_t reliability_parameter;
uint16_t label_length;
uint16_t protocol_length;
char label_and_protocol[];
} __attribute__((packed));
struct rtcweb_datachannel_ack {
uint8_t message_type; /* DATA_CHANNEL_ACK */
} __attribute__((packed));
static void
init_peer_connection(struct peer_connection *pc, int fd, int client)
{
uint32_t i;
struct channel *channel;
for (i = 0; i < NUMBER_OF_CHANNELS; i++) {
channel = &(pc->channels[i]);
channel->sid = i;
channel->pr_policy = SCTP_PR_SCTP_NONE;
channel->pr_value = 0;
channel->unordered = 0;
channel->type = 0xff;
channel->priority = 0;
channel->label = NULL;
channel->protocol = NULL;
channel->state = DATA_CHANNEL_CLOSED;
channel->flags = 0;
}
pc->fd = fd;
pc->client = client;
pthread_mutex_init(&pc->mutex, NULL);
}
static void
lock_peer_connection(struct peer_connection *pc)
{
pthread_mutex_lock(&pc->mutex);
}
static void
unlock_peer_connection(struct peer_connection *pc)
{
pthread_mutex_unlock(&pc->mutex);
}
static struct channel *
find_channel_by_id(struct peer_connection *pc, uint16_t id)
{
if (id < NUMBER_OF_STREAMS) {
return (&(pc->channels[id]));
} else {
return (NULL);
}
}
static struct channel *
find_free_channel(struct peer_connection *pc)
{
uint32_t i;
for (i = pc->client ? 0 : 1; i < NUMBER_OF_CHANNELS; i += 2) {
if (pc->channels[i].state == DATA_CHANNEL_CLOSED) {
break;
}
}
if (i >= NUMBER_OF_CHANNELS) {
return (NULL);
} else {
return (&(pc->channels[i]));
}
}
static int
send_data_channel_open_message(int fd,
uint16_t sid,
uint8_t channel_type,
uint16_t priority,
uint32_t reliability_parameter,
char *label,
char *protocol)
{
struct rtcweb_datachannel_open dc_open;
struct sctp_sndinfo sndinfo;
struct iovec iov[3];
assert(label != NULL);
assert(strlen(label) < 65536);
assert(protocol != NULL);
assert(strlen(protocol) < 65536);
dc_open.message_type = DATA_CHANNEL_OPEN_MESSAGE_TYPE;
dc_open.channel_type = channel_type;
dc_open.priority = htons(priority);
dc_open.reliability_parameter = htonl(reliability_parameter);
dc_open.label_length = htons((uint16_t)strlen(label));
dc_open.protocol_length = htons((uint16_t)strlen(protocol));
iov[0].iov_base = &dc_open;
iov[0].iov_len = sizeof(struct rtcweb_datachannel_open);
iov[1].iov_base = label;
iov[1].iov_len = strlen(label);
iov[2].iov_base = protocol;
iov[2].iov_len = strlen(protocol);
memset(&sndinfo, 0, sizeof(struct sctp_sndinfo));
sndinfo.snd_sid = sid;
sndinfo.snd_flags = SCTP_EOR;
sndinfo.snd_ppid = htonl(DATA_CHANNEL_PPID_CONTROL);
if (sctp_sendv(fd,
iov, 3,
NULL, 0,
&sndinfo, (socklen_t)sizeof(struct sctp_sndinfo),
SCTP_SENDV_SNDINFO, 0) < 0) {
perror("sctp_sendv");
return (0);
} else {
return (1);
}
}
static int
send_data_channel_ack_message(int fd,
uint16_t sid)
{
struct rtcweb_datachannel_ack dc_ack;
struct sctp_sndinfo sndinfo;
struct iovec iov[1];
dc_ack.message_type = DATA_CHANNEL_ACK_MESSAGE_TYPE;
iov[0].iov_base = &dc_ack;
iov[0].iov_len = sizeof(struct rtcweb_datachannel_ack);
memset(&sndinfo, 0, sizeof(struct sctp_sndinfo));
sndinfo.snd_sid = sid;
sndinfo.snd_flags = SCTP_EOR;
sndinfo.snd_ppid = htonl(DATA_CHANNEL_PPID_CONTROL);
if (sctp_sendv(fd,
iov, 1,
NULL, 0,
&sndinfo, (socklen_t)sizeof(struct sctp_sndinfo),
SCTP_SENDV_SNDINFO, 0) < 0) {
perror("sctp_sendv");
return (0);
} else {
return (1);
}
}
static void
send_deferred_messages(struct peer_connection *pc)
{
uint32_t i;
struct channel *channel;
for (i = 0; i < NUMBER_OF_CHANNELS; i++) {
channel = &(pc->channels[i]);
if (channel->flags & DATA_CHANNEL_FLAGS_SEND_REQ) {
if (send_data_channel_open_message(pc->fd, channel->sid, channel->type, channel->priority, channel->pr_value, channel->label, channel->protocol)) {
channel->flags &= ~DATA_CHANNEL_FLAGS_SEND_REQ;
} else {
if (errno != EAGAIN) {
/* XXX: error handling */
}
}
}
if (channel->flags & DATA_CHANNEL_FLAGS_SEND_ACK) {
if (send_data_channel_ack_message(pc->fd, channel->sid)) {
channel->flags &= ~DATA_CHANNEL_FLAGS_SEND_ACK;
} else {
if (errno != EAGAIN) {
/* XXX: error handling */
}
}
}
}
return;
}
static struct channel *
open_channel(struct peer_connection *pc,
uint8_t unordered,
uint16_t pr_policy, uint32_t pr_value,
uint16_t priority,
char *label,
char *protocol)
{
struct channel *channel;
if ((pr_policy != SCTP_PR_SCTP_NONE) &&
(pr_policy != SCTP_PR_SCTP_RTX) &&
(pr_policy != SCTP_PR_SCTP_TTL)) {
return (NULL);
}
if ((unordered != 0) && (unordered != 1)) {
return (NULL);
}
if ((pr_policy == SCTP_PR_SCTP_NONE) && (pr_value != 0)) {
return (NULL);
}
if ((label == NULL) || (protocol == NULL)) {
return (NULL);
}
if ((strlen(label) > 65535) || (strlen(protocol) > 65535)) {
return (NULL);
}
if ((channel = find_free_channel(pc)) == NULL) {
return (NULL);
}
channel->pr_policy = pr_policy;
channel->pr_value = pr_value;
channel->unordered = unordered;
switch (pr_policy) {
case SCTP_PR_SCTP_NONE:
channel->type = DATA_CHANNEL_RELIABLE;
break;
case SCTP_PR_SCTP_RTX:
channel->type = DATA_CHANNEL_PARTIAL_RELIABLE_REXMIT;
break;
case SCTP_PR_SCTP_TTL:
channel->type = DATA_CHANNEL_PARTIAL_RELIABLE_TIMED;
break;
}
if (unordered) {
channel->type |= DATA_CHANNEL_UNORDERED;
}
channel->priority = priority;
channel->label = strdup(label);
channel->protocol = strdup(protocol);
channel->state = DATA_CHANNEL_CONNECTING;
channel->flags = 0;
if (send_data_channel_open_message(pc->fd, channel->sid, channel->type, channel->priority, channel->pr_value, channel->label, channel->protocol)) {
channel->state = DATA_CHANNEL_CONNECTING;
} else {
if (errno == EAGAIN) {
channel->flags |= DATA_CHANNEL_FLAGS_SEND_REQ;
} else {
channel->pr_policy = SCTP_PR_SCTP_NONE;
channel->pr_value = 0;
channel->unordered = 0;
channel->type = 0xff;
channel->priority = 0;
free(channel->label);
channel->label = NULL;
free(channel->protocol);
channel->protocol = NULL;
channel->state = DATA_CHANNEL_CLOSED;
channel->flags = 0;
channel = NULL;
}
}
return (channel);
}
static int
send_user_message(struct peer_connection *pc, struct channel *channel, char *message, size_t length)
{
struct sctp_sendv_spa spa;
struct iovec iov;
if (channel == NULL) {
return (0);
}
if ((channel->state != DATA_CHANNEL_OPEN) &&
(channel->state != DATA_CHANNEL_CONNECTING)) {
/* XXX: What to do in other states */
return (0);
}
iov.iov_base = message;
iov.iov_len = length;
memset(&spa, 0, sizeof(struct sctp_sendv_spa));
spa.sendv_sndinfo.snd_sid = channel->sid;
if ((channel->state == DATA_CHANNEL_OPEN) &&
(channel->unordered)) {
spa.sendv_sndinfo.snd_flags = SCTP_EOR | SCTP_UNORDERED;
} else {
spa.sendv_sndinfo.snd_flags = SCTP_EOR;
}
spa.sendv_sndinfo.snd_ppid = htonl(DATA_CHANNEL_PPID_DOMSTRING);
spa.sendv_flags = SCTP_SEND_SNDINFO_VALID;
if ((channel->pr_policy == SCTP_PR_SCTP_TTL) ||
(channel->pr_policy == SCTP_PR_SCTP_RTX)) {
spa.sendv_prinfo.pr_policy = channel->pr_policy;
spa.sendv_prinfo.pr_value = channel->pr_value;
spa.sendv_flags |= SCTP_SEND_PRINFO_VALID;
}
if (sctp_sendv(pc->fd,
&iov, 1,
NULL, 0,
&spa, (socklen_t)sizeof(struct sctp_sendv_spa),
SCTP_SENDV_SPA, 0) < 0) {
perror("sctp_sendv");
return (0);
} else {
return (1);
}
}
static void
reset_outgoing_stream(struct peer_connection *pc, uint16_t sid)
{
struct sctp_reset_streams *srs;
size_t len;
len = sizeof(struct sctp_reset_streams) + sizeof(uint16_t);
srs = (struct sctp_reset_streams *)malloc(len);
if (srs == NULL) {
return;
}
memset(srs, 0, len);
srs->srs_flags = SCTP_STREAM_RESET_OUTGOING;
srs->srs_number_streams = 1;
srs->srs_stream_list[0] = sid;
if (setsockopt(pc->fd, IPPROTO_SCTP, SCTP_RESET_STREAMS, srs, (socklen_t)len) < 0) {
perror("setsockopt");
printf("reset_outgoing_stream: Can't reset stream %u.\n", sid);
}
free(srs);
}
static void
close_channel(struct peer_connection *pc, struct channel *channel)
{
if (channel == NULL) {
return;
}
if (channel->state != DATA_CHANNEL_OPEN) {
return;
}
reset_outgoing_stream(pc, channel->sid);
channel->state = DATA_CHANNEL_CLOSING;
return;
}
static void
handle_open_ack_message(struct peer_connection *pc,
struct rtcweb_datachannel_ack *ack,
size_t length, uint16_t sid)
{
struct channel *channel;
channel = find_channel_by_id(pc, sid);
if (channel == NULL) {
/* XXX: some error handling */
return;
}
if (channel->state == DATA_CHANNEL_OPEN) {
return;
}
if (channel->state != DATA_CHANNEL_CONNECTING) {
/* XXX: error handling */
return;
}
channel->state = DATA_CHANNEL_OPEN;
return;
}
static void
handle_open_request_message(struct peer_connection *pc,
struct rtcweb_datachannel_open *dc_open,
size_t length,
uint16_t sid)
{
struct channel *channel;
uint16_t label_length;
uint16_t protocol_length;
label_length = ntohs(dc_open->label_length);
protocol_length = ntohs(dc_open->protocol_length);
if (sizeof(struct rtcweb_datachannel_open) + label_length + protocol_length != length) {
printf("handle_open_request_message: invalid packet.\n");
}
if ((channel = find_channel_by_id(pc, sid)) == NULL) {
printf("handle_open_request_message: Can't find channel for id = %u.\n",
sid);
/* XXX: some error handling */
return;
}
if (channel->state != DATA_CHANNEL_CLOSED) {
printf("handle_open_request_message: channel for id = %u not in CLOSED (state = %u).\n",
sid, channel->state);
/* XXX: some error handling */
return;
}
channel->type = dc_open->channel_type;
switch (dc_open->channel_type) {
case DATA_CHANNEL_RELIABLE:
channel->pr_policy = SCTP_PR_SCTP_NONE;
channel->pr_value = ntohl(dc_open->reliability_parameter);
channel->unordered = 0;
break;
case DATA_CHANNEL_RELIABLE_UNORDERED:
channel->pr_policy = SCTP_PR_SCTP_NONE;
channel->pr_value = ntohl(dc_open->reliability_parameter);
channel->unordered = 1;
break;
case DATA_CHANNEL_PARTIAL_RELIABLE_REXMIT:
channel->pr_policy = SCTP_PR_SCTP_RTX;
channel->pr_value = ntohl(dc_open->reliability_parameter);
channel->unordered = 0;
break;
case DATA_CHANNEL_PARTIAL_RELIABLE_REXMIT_UNORDERED:
channel->pr_policy = SCTP_PR_SCTP_RTX;
channel->pr_value = ntohl(dc_open->reliability_parameter);
channel->unordered = 1;
break;
case DATA_CHANNEL_PARTIAL_RELIABLE_TIMED:
channel->pr_policy = SCTP_PR_SCTP_TTL;
channel->pr_value = ntohl(dc_open->reliability_parameter);
channel->unordered = 0;
break;
case DATA_CHANNEL_PARTIAL_RELIABLE_TIMED_UNORDERED:
channel->pr_policy = SCTP_PR_SCTP_TTL;
channel->pr_value = ntohl(dc_open->reliability_parameter);
channel->unordered = 1;
break;
default:
/* XXX error handling */
break;
}
channel->type = dc_open->channel_type;
channel->priority = ntohs(dc_open->priority);
channel->label = malloc((size_t)label_length + 1);
memcpy(channel->label, dc_open->label_and_protocol, label_length);
channel->label[label_length] = '\0';
channel->protocol = malloc((size_t)protocol_length + 1);
memcpy(channel->protocol, dc_open->label_and_protocol + label_length, protocol_length);
channel->label[protocol_length] = '\0';
channel->state = DATA_CHANNEL_OPEN;
channel->flags = 0;
if (send_data_channel_ack_message(pc->fd, sid) == 0) {
if (errno == EAGAIN) {
channel->flags |= DATA_CHANNEL_FLAGS_SEND_ACK;
} else {
/* XXX error handling*/
}
}
}
static void
handle_unknown_message(char *msg, size_t length, uint16_t i_stream)
{
/* XXX: Send an error message */
return;
}
static void
handle_data_message(struct peer_connection *pc,
char *buffer, size_t length, uint16_t sid)
{
struct channel *channel;
channel = find_channel_by_id(pc, sid);
if (channel == NULL) {
/* XXX: Some error handling */
return;
}
if (channel->state == DATA_CHANNEL_CONNECTING) {
/* Implicit ACK */
channel->state = DATA_CHANNEL_OPEN;
}
if (channel->state != DATA_CHANNEL_OPEN) {
/* XXX: What about other states? */
/* XXX: Some error handling */
return;
} else {
/* Assuming DATA_CHANNEL_PPID_DOMSTRING */
/* XXX: Protect for non 0 terminated buffer */
printf("Message received of length %lu on channel with id %d: %.*s\n",
length, channel->sid, (int)length, buffer);
}
return;
}
static void
handle_message(struct peer_connection *pc, char *buffer, size_t length, uint32_t ppid, uint16_t sid)
{
struct rtcweb_datachannel_open *dc_open;
struct rtcweb_datachannel_ack *dc_ack;
uint8_t type;
switch (ppid) {
case DATA_CHANNEL_PPID_CONTROL:
if (length < sizeof(uint8_t)) {
return;
}
type = *(uint8_t *)buffer;
switch (type) {
case DATA_CHANNEL_ACK_MESSAGE_TYPE:
if (length < sizeof(struct rtcweb_datachannel_ack)) {
/* XXX: error handling? */
return;
}
dc_ack = (struct rtcweb_datachannel_ack *)buffer;
handle_open_ack_message(pc, dc_ack, length, sid);
break;
case DATA_CHANNEL_OPEN_MESSAGE_TYPE:
if (length < sizeof(struct rtcweb_datachannel_open)) {
/* XXX: error handling? */
return;
}
dc_open = (struct rtcweb_datachannel_open *)buffer;
handle_open_request_message(pc, dc_open, length, sid);
break;
default:
handle_unknown_message(buffer, length, sid);
break;
}
break;
case DATA_CHANNEL_PPID_DOMSTRING:
case DATA_CHANNEL_PPID_BINARY:
handle_data_message(pc, buffer, length, sid);
break;
default:
printf("Message of length %lu, PPID %u on stream %u received.\n",
length, ppid, sid);
break;
}
}
static void
handle_association_change_event(struct sctp_assoc_change *sac)
{
unsigned int i, n;
printf("Association change ");
switch (sac->sac_state) {
case SCTP_COMM_UP:
printf("SCTP_COMM_UP");
break;
case SCTP_COMM_LOST:
printf("SCTP_COMM_LOST");
break;
case SCTP_RESTART:
printf("SCTP_RESTART");
break;
case SCTP_SHUTDOWN_COMP:
printf("SCTP_SHUTDOWN_COMP");
break;
case SCTP_CANT_STR_ASSOC:
printf("SCTP_CANT_STR_ASSOC");
break;
default:
printf("UNKNOWN");
break;
}
printf(", streams (in/out) = (%u/%u)",
sac->sac_inbound_streams, sac->sac_outbound_streams);
n = sac->sac_length - sizeof(struct sctp_assoc_change);
if (((sac->sac_state == SCTP_COMM_UP) ||
(sac->sac_state == SCTP_RESTART)) && (n > 0)) {
printf(", supports");
for (i = 0; i < n; i++) {
switch (sac->sac_info[i]) {
case SCTP_ASSOC_SUPPORTS_PR:
printf(" PR");
break;
case SCTP_ASSOC_SUPPORTS_AUTH:
printf(" AUTH");
break;
case SCTP_ASSOC_SUPPORTS_ASCONF:
printf(" ASCONF");
break;
case SCTP_ASSOC_SUPPORTS_MULTIBUF:
printf(" MULTIBUF");
break;
case SCTP_ASSOC_SUPPORTS_RE_CONFIG:
printf(" RE-CONFIG");
break;
default:
printf(" UNKNOWN(0x%02x)", sac->sac_info[i]);
break;
}
}
} else if (((sac->sac_state == SCTP_COMM_LOST) ||
(sac->sac_state == SCTP_CANT_STR_ASSOC)) && (n > 0)) {
printf(", ABORT =");
for (i = 0; i < n; i++) {
printf(" 0x%02x", sac->sac_info[i]);
}
}
printf(".\n");
if ((sac->sac_state == SCTP_CANT_STR_ASSOC) ||
(sac->sac_state == SCTP_SHUTDOWN_COMP) ||
(sac->sac_state == SCTP_COMM_LOST)) {
exit(0);
}
return;
}
static void
handle_peer_address_change_event(struct sctp_paddr_change *spc)
{
char addr_buf[INET6_ADDRSTRLEN];
const char *addr;
struct sockaddr_in *sin;
struct sockaddr_in6 *sin6;
switch (spc->spc_aaddr.ss_family) {
case AF_INET:
sin = (struct sockaddr_in *)&spc->spc_aaddr;
addr = inet_ntop(AF_INET, &sin->sin_addr, addr_buf, INET6_ADDRSTRLEN);
break;
case AF_INET6:
sin6 = (struct sockaddr_in6 *)&spc->spc_aaddr;
addr = inet_ntop(AF_INET6, &sin6->sin6_addr, addr_buf, INET6_ADDRSTRLEN);
break;
default:
break;
}
printf("Peer address %s is now ", addr);
switch (spc->spc_state) {
case SCTP_ADDR_AVAILABLE:
printf("SCTP_ADDR_AVAILABLE");
break;
case SCTP_ADDR_UNREACHABLE:
printf("SCTP_ADDR_UNREACHABLE");
break;
case SCTP_ADDR_REMOVED:
printf("SCTP_ADDR_REMOVED");
break;
case SCTP_ADDR_ADDED:
printf("SCTP_ADDR_ADDED");
break;
case SCTP_ADDR_MADE_PRIM:
printf("SCTP_ADDR_MADE_PRIM");
break;
case SCTP_ADDR_CONFIRMED:
printf("SCTP_ADDR_CONFIRMED");
break;
default:
printf("UNKNOWN");
break;
}
printf(" (error = 0x%08x).\n", spc->spc_error);
return;
}
static void
handle_adaptation_indication(struct sctp_adaptation_event *sai)
{
printf("Adaptation indication: %x.\n", sai-> sai_adaptation_ind);
return;
}
static void
handle_shutdown_event(struct sctp_shutdown_event *sse)
{
printf("Shutdown event.\n");
/* XXX: notify all channels. */
return;
}
static void
handle_stream_reset_event(struct peer_connection *pc, struct sctp_stream_reset_event *strrst)
{
uint32_t n, i;
struct channel *channel;
n = (strrst->strreset_length - sizeof(struct sctp_stream_reset_event)) / sizeof(uint16_t);
printf("Stream reset event: flags = %x, ", strrst->strreset_flags);
if (strrst->strreset_flags & SCTP_STREAM_RESET_INCOMING_SSN) {
if (strrst->strreset_flags & SCTP_STREAM_RESET_OUTGOING_SSN) {
printf("incoming/");
}
printf("incoming ");
}
if (strrst->strreset_flags & SCTP_STREAM_RESET_OUTGOING_SSN) {
printf("outgoing ");
}
printf("stream ids = ");
for (i = 0; i < n; i++) {
if (i > 0) {
printf(", ");
}
printf("%d", strrst->strreset_stream_list[i]);
}
printf(".\n");
if (!(strrst->strreset_flags & SCTP_STREAM_RESET_DENIED) &&
!(strrst->strreset_flags & SCTP_STREAM_RESET_FAILED)) {
for (i = 0; i < n; i++) {
channel = find_channel_by_id(pc, strrst->strreset_stream_list[i]);
if (channel == NULL) {
printf("handle_stream_reset_event: channel not found for id = %u.\n", strrst->strreset_stream_list[i]);
continue;
}
if (strrst->strreset_flags & SCTP_STREAM_RESET_INCOMING_SSN) {
if ((channel->flags & DATA_CHANNEL_FLAGS_O_RESET) == 0) {
reset_outgoing_stream(pc, channel->sid);
}
channel->flags |= DATA_CHANNEL_FLAGS_I_RESET;
}
if (strrst->strreset_flags & SCTP_STREAM_RESET_OUTGOING_SSN) {
channel->flags |= DATA_CHANNEL_FLAGS_O_RESET;
}
if ((channel->flags & DATA_CHANNEL_FLAGS_I_RESET) &&
(channel->flags & DATA_CHANNEL_FLAGS_O_RESET)) {
channel->pr_policy = SCTP_PR_SCTP_NONE;
channel->pr_value = 0;
channel->unordered = 0;
channel->type = 0xff;
channel->priority = 0;
free(channel->label);
channel->label = NULL;
free(channel->protocol);
channel->protocol = NULL;
channel->state = DATA_CHANNEL_CLOSED;
channel->flags = 0;
}
}
}
return;
}
static void
handle_remote_error_event(struct sctp_remote_error *sre)
{
size_t i, n;
n = sre->sre_length - sizeof(struct sctp_remote_error);
printf("Remote Error (error = 0x%04x): ", sre->sre_error);
for (i = 0; i < n; i++) {
printf(" 0x%02x", sre-> sre_data[i]);
}
printf(".\n");
return;
}
static void
handle_send_failed_event(struct sctp_send_failed_event *ssfe)
{
size_t i, n;
if (ssfe->ssfe_flags & SCTP_DATA_UNSENT) {
printf("Unsent ");
}
if (ssfe->ssfe_flags & SCTP_DATA_SENT) {
printf("Sent ");
}
if (ssfe->ssfe_flags & ~(SCTP_DATA_SENT | SCTP_DATA_UNSENT)) {
printf("(flags = %x) ", ssfe->ssfe_flags);
}
printf("message with PPID = %d, SID = %d, flags: 0x%04x due to error = 0x%08x",
ntohl(ssfe->ssfe_info.snd_ppid), ssfe->ssfe_info.snd_sid,
ssfe->ssfe_info.snd_flags, ssfe->ssfe_error);
n = ssfe->ssfe_length - sizeof(struct sctp_send_failed_event);
for (i = 0; i < n; i++) {
printf(" 0x%02x", ssfe->ssfe_data[i]);
}
printf(".\n");
return;
}
static void
handle_notification(struct peer_connection *pc, union sctp_notification *notif, size_t n)
{
if (notif->sn_header.sn_length != (uint32_t)n) {
return;
}
switch (notif->sn_header.sn_type) {
case SCTP_ASSOC_CHANGE:
handle_association_change_event(&(notif->sn_assoc_change));
break;
case SCTP_PEER_ADDR_CHANGE:
handle_peer_address_change_event(&(notif->sn_paddr_change));
break;
case SCTP_REMOTE_ERROR:
handle_remote_error_event(&(notif->sn_remote_error));
break;
case SCTP_SHUTDOWN_EVENT:
handle_shutdown_event(&(notif->sn_shutdown_event));
break;
case SCTP_ADAPTATION_INDICATION:
handle_adaptation_indication(&(notif->sn_adaptation_event));
break;
case SCTP_PARTIAL_DELIVERY_EVENT:
break;
case SCTP_AUTHENTICATION_EVENT:
break;
case SCTP_SENDER_DRY_EVENT:
break;
case SCTP_NOTIFICATIONS_STOPPED_EVENT:
break;
case SCTP_SEND_FAILED_EVENT:
handle_send_failed_event(&(notif->sn_send_failed_event));
break;
case SCTP_STREAM_RESET_EVENT:
handle_stream_reset_event(pc, &(notif->sn_strreset_event));
send_deferred_messages(pc);
break;
case SCTP_ASSOC_RESET_EVENT:
break;
case SCTP_STREAM_CHANGE_EVENT:
break;
default:
break;
}
}
static void
print_status(struct peer_connection *pc)
{
struct sctp_status status;
socklen_t len;
uint32_t i;
struct channel *channel;
len = (socklen_t)sizeof(struct sctp_status);
if (getsockopt(pc->fd, IPPROTO_SCTP, SCTP_STATUS, &status, &len) < 0) {
perror("getsockopt");
return;
}
printf("Association state: ");
switch (status.sstat_state) {
case SCTP_CLOSED:
printf("CLOSED\n");
break;
case SCTP_BOUND:
printf("BOUND\n");
break;
case SCTP_LISTEN:
printf("LISTEN\n");
break;
case SCTP_COOKIE_WAIT:
printf("COOKIE_WAIT\n");
break;
case SCTP_COOKIE_ECHOED:
printf("COOKIE_ECHOED\n");
break;
case SCTP_ESTABLISHED:
printf("ESTABLISHED\n");
break;
case SCTP_SHUTDOWN_PENDING:
printf("SHUTDOWN_PENDING\n");
break;
case SCTP_SHUTDOWN_SENT:
printf("SHUTDOWN_SENT\n");
break;
case SCTP_SHUTDOWN_RECEIVED:
printf("SHUTDOWN_RECEIVED\n");
break;
case SCTP_SHUTDOWN_ACK_SENT:
printf("SHUTDOWN_ACK_SENT\n");
break;
default:
printf("UNKNOWN\n");
break;
}
printf("Number of streams (i/o) = (%u/%u)\n",
status.sstat_instrms, status.sstat_outstrms);
for (i = 0; i < NUMBER_OF_CHANNELS; i++) {
channel = &(pc->channels[i]);
if (channel->state == DATA_CHANNEL_CLOSED) {
continue;
}
printf("Channel with id = %u: state ", channel->sid);
switch (channel->state) {
case DATA_CHANNEL_CLOSED:
printf("CLOSED");
break;
case DATA_CHANNEL_CONNECTING:
printf("CONNECTING");
break;
case DATA_CHANNEL_OPEN:
printf("OPEN");
break;
case DATA_CHANNEL_CLOSING:
printf("CLOSING");
break;
default:
printf("UNKNOWN(%d)", channel->state);
break;
}
printf(", ");
printf("type ");
switch (channel->type) {
case DATA_CHANNEL_RELIABLE:
printf("DATA_CHANNEL_RELIABLE");
break;
case DATA_CHANNEL_PARTIAL_RELIABLE_REXMIT:
printf("DATA_CHANNEL_PARTIAL_RELIABLE_REXMIT");
break;
case DATA_CHANNEL_PARTIAL_RELIABLE_TIMED:
printf("DATA_CHANNEL_PARTIAL_RELIABLE_TIMED");
break;
case DATA_CHANNEL_RELIABLE_UNORDERED:
printf("DATA_CHANNEL_RELIABLE_UNORDERED");
break;
case DATA_CHANNEL_PARTIAL_RELIABLE_REXMIT_UNORDERED:
printf("DATA_CHANNEL_PARTIAL_RELIABLE_REXMIT_UNORDERED");
break;
case DATA_CHANNEL_PARTIAL_RELIABLE_TIMED_UNORDERED:
printf("DATA_CHANNEL_PARTIAL_RELIABLE_TIMED_UNORDERED");
break;
default:
printf("%u.\n", channel->type);
break;
}
printf(", ");
if (channel->unordered) {
printf("unordered, ");