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
|
/* packet-rtp-events.c
*
* Routines for RFC 2833 RTP Events dissection
* Copyright 2003, Kevin A. Noll <knoll[AT]poss.com>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
* Ref https://tools.ietf.org/html/rfc4733
*/
/*
* This dissector tries to dissect RTP Events.
*
* Cisco NSE is now supported, additions by
* Gonzalo Salgueiro <gsalguei@cisco.com>
* Chidambaram Arunachalam <carunach@cisco.com>
* Copyright 2008, Cisco Systems, Inc.
*/
#include "config.h"
#include <epan/packet.h>
#include <epan/prefs.h>
#include <epan/proto_data.h>
#include "packet-rtp-events.h"
#include "packet-rtp.h"
#include <epan/tap.h>
void proto_register_rtp_events(void);
void proto_reg_handoff_rtp_events(void);
/* 101 for RTP Event, 100 for Cisco NSE */
#define RTP_EVENT_DEFAULT_PT_RANGE "100-101"
/* RTP Event Fields */
static int proto_rtp_events = -1;
static int rtp_event_tap = -1;
static int hf_rtp_events_event = -1; /* one byte */
static int hf_rtp_events_end = -1; /* one bit */
static int hf_rtp_events_reserved = -1; /* one bit */
static int hf_rtp_events_volume = -1; /* six bits */
static int hf_rtp_events_duration = -1; /* sixteen bits */
#define RTP_DTMF_0 0
#define RTP_DTMF_1 1
#define RTP_DTMF_2 2
#define RTP_DTMF_3 3
#define RTP_DTMF_4 4
#define RTP_DTMF_5 5
#define RTP_DTMF_6 6
#define RTP_DTMF_7 7
#define RTP_DTMF_8 8
#define RTP_DTMF_9 9
#define RTP_DTMF_STAR 10
#define RTP_DTMF_POUND 11
#define RTP_DTMF_A 12
#define RTP_DTMF_B 13
#define RTP_DTMF_C 14
#define RTP_DTMF_D 15
#define RTP_DTMF_FLASH 16
#define RTP_ANS 32
#define RTP_ANSREV 33
#define RTP_ANSAM 34
#define RTP_ANSAMREV 35
#define RTP_CNG 36
#define RTP_V21C1B0 37
#define RTP_V21C1B1 38
#define RTP_V21C2B0 39
#define RTP_V21C2B1 40
#define RTP_CRDI 41
#define RTP_CRDR 42
#define RTP_CRE 43
#define RTP_ESI 44
#define RTP_ESR 45
#define RTP_MRDI 46
#define RTP_MRDR 47
#define RTP_MRE 48
#define RTP_CT 49
#define RTP_OFFHOOK 64
#define RTP_ONHOOK 65
#define RTP_DIALTONE 66
#define RTP_INTDT 67
#define RTP_SPCDT 68
#define RTP_2NDDT 69
#define RTP_RGTONE 70
#define RTP_SPRGTONE 71
#define RTP_BUSYTONE 72
#define RTP_CNGTONE 73
#define RTP_SPINFOTN 74
#define RTP_CMFTTONE 75
#define RTP_HOLDTONE 76
#define RTP_RECTONE 77
#define RTP_CLRWTTONE 78
#define RTP_CWTONE 79
#define RTP_PAYTONE 80
#define RTP_POSINDTONE 81
#define RTP_NEGINDTONE 82
#define RTP_WARNTONE 83
#define RTP_INTRTONE 84
#define RTP_CALLCDTONE 85
#define RTP_PAYPHONE 86
#define RTP_CAS 87
#define RTP_OFFHKWARN 88
#define RTP_RING 89
#define RTP_ACCPTTONE 96
#define RTP_CONFIRMTN 97
#define RTP_DLTNRECALL 98
#define RTP_END3WAYTN 99
#define RTP_FACTONE 100
#define RTP_LNLOCKTN 101
#define RTP_NUMUNOBT 102
#define RTP_OFFERGTONE 103
#define RTP_PERMSIGTN 104
#define RTP_PREEMPTTN 105
#define RTP_QUETONE 106
#define RTP_REFUSALTN 107
#define RTP_ROUTETONE 108
#define RTP_VALIDTONE 109
#define RTP_WAITGTONE 110
#define RTP_WARNEOPTN 111
#define RTP_WARNPIPTN 112
#define RTP_MF0 128
#define RTP_MF1 129
#define RTP_MF2 130
#define RTP_MF3 131
#define RTP_MF4 132
#define RTP_MF5 133
#define RTP_MF6 134
#define RTP_MF7 135
#define RTP_MF8 136
#define RTP_MF9 137
#define RTP_K0 138
#define RTP_K1 139
#define RTP_K2 140
#define RTP_S0 141
#define RTP_S1 142
#define RTP_S3 143
#define RTP_WINK 160
#define RTP_WINKOFF 161
#define RTP_INCSEIZ 162
#define RTP_SEIZURE 163
#define RTP_UNSEIZE 164
#define RTP_COT 165
#define RTP_DEFCOT 166
#define RTP_COTTONE 167
#define RTP_COTSEND 168
#define RTP_COTVERFD 170
#define RTP_LOOPBACK 171
#define RTP_MWATTTONE 172
#define RTP_NEWMWATTTN 173
#define RTP_CISCO_NSE_FAX_PASSTHROUGH_IND 192
#define RTP_CISCO_NSE_MODEM_PASSTHROUGH_IND 193
#define RTP_CISCO_NSE_VOICE_MODE_IND 194
#define RTP_CISCO_NSE_MODEM_RELAY_CAP_IND 199
#define RTP_CISCO_NSE_FAX_RELAY_IND 200
#define RTP_CISCO_NSE_ACK 201
#define RTP_CISCO_NSE_NACK 202
#define RTP_CISCO_NSE_MODEM_RELAY_IND 203
/* https://www.iana.org/assignments/audio-telephone-event-registry/audio-telephone-event-registry.xml */
static const value_string rtp_event_type_values[] =
{
{ RTP_DTMF_0, "DTMF Zero 0" },
{ RTP_DTMF_1, "DTMF One 1" },
{ RTP_DTMF_2, "DTMF Two 2" },
{ RTP_DTMF_3, "DTMF Three 3" },
{ RTP_DTMF_4, "DTMF Four 4" },
{ RTP_DTMF_5, "DTMF Five 5" },
{ RTP_DTMF_6, "DTMF Six 6" },
{ RTP_DTMF_7, "DTMF Seven 7" },
{ RTP_DTMF_8, "DTMF Eight 8" },
{ RTP_DTMF_9, "DTMF Nine 9" },
{ RTP_DTMF_STAR, "DTMF Star *" },
{ RTP_DTMF_POUND, "DTMF Pound #" },
{ RTP_DTMF_A, "DTMF A" },
{ RTP_DTMF_B, "DTMF B" },
{ RTP_DTMF_C, "DTMF C" },
{ RTP_DTMF_D, "DTMF D" },
{ RTP_DTMF_FLASH, "Flash" },
/* 17-22 Unassigned*/
{ 23, "CRdSeg: second segment of V.8 bis CRd signal" }, // [RFC4734]
{ 24, "CReSeg : second segment of V.8 bis CRe signal" }, // [RFC4734]
{ 25, "MRdSeg : second segment of V.8 bis MRd signal" }, // [RFC4734]
{ 26, "MReSeg : second segment of V.8 bis MRe signal" }, // [RFC4734]
{ 27, "V32AC : A pattern of bits modulated at 4800 bits / s, emitted by a V.32 / V.32bis answering terminal upon detection of the AA pattern." }, // [RFC4734]
{ 28, "V8bISeg : first segment of initiating V.8 bis signal" }, // [RFC4734]
{ 29, "V8bRSeg : first segment of responding V.8 bis signal" }, // [RFC4734]
{ 30, "V21L300 : 300 bits / s low channel V.21 indication" }, // [RFC4734]
{ 31, "V21H300 : 300 bits / s high channel V.21 indication" }, // [RFC4734]
{ RTP_ANS, "Fax ANS"},
{ RTP_ANSREV, "Fax /ANS"},
{ RTP_ANSAM, "Fax ANSam"},
{ RTP_ANSAMREV, "Fax /ANSam"},
{ RTP_CNG, "Fax CNG"},
{ RTP_V21C1B0, "V.21 channel 1, 0 bit"},
{ RTP_V21C1B1, "V.21 channel 1, 1 bit"},
{ RTP_V21C2B0, "V.21 channel 2, 0 bit"},
{ RTP_V21C2B1, "V.21 channel 2, 1 bit"},
{ RTP_CRDI, "Fax CRdi"},
{ RTP_CRDR, "Fax CRdr"},
{ RTP_CRE, "Fax CRe"},
{ RTP_ESI, "Fax ESi"},
{ RTP_ESR, "Fax ESr"},
{ RTP_MRDI, "Fax MRdi"},
{ RTP_MRDR, "Fax MRdr"},
{ RTP_MRE, "Fax MRe"},
{ RTP_CT, "Fax CT"},
/* 50-51 Unassigned*/
{ 52, "ANS2225: 2225 Hz indication for text telephony" }, // [RFC4734]
{ 53, "CI(V.8 Call Indicator signal preamble)" }, // [RFC4734]
{ 54, "V.21 preamble flag(T.30)" }, // [RFC4734]
{ 55, "V21L110 : 110 bits / s V.21 indication for text telephony" }, // [RFC4734]
{ 56, "B103L300 : Bell 103 low channel indication for text telephony" }, // [RFC4734]
{ 57, "V23Main : V.23 main channel indication for text telephony" }, // [RFC4734]
{ 58, "V23Back : V.23 back channel indication for text telephony" }, // [RFC4734]
{ 59, "Baud4545 : 45.45 bits / s Baudot indication for text telephony" }, // [RFC4734]
{ 60, "Baud50 : 50 bits / s Baudot indication for text telephony" }, // [RFC4734]
{ 61, "VBDGen : Tone patterns indicative of use of an unidentified modem type" }, // [RFC4734]
{ 62, "XCIMark : A pattern of bits modulated in the V.23 main channel, emitted by a V.18 calling terminal" }, // [RFC4734]
{ 63, "V32AA : A pattern of bits modulated at 4800 bits / s, emitted by a V.32 / V.23bis calling terminal" }, // [RFC4734]
{ RTP_OFFHOOK, "Off Hook"},
{ RTP_ONHOOK, "On Hook"},
{ RTP_DIALTONE, "Dial tone"},
{ RTP_INTDT, "PABX internal dial tone"},
{ RTP_SPCDT, "Special dial tone"},
{ RTP_2NDDT, "Second dial tone"},
{ RTP_RGTONE, "Ringing tone"},
{ RTP_SPRGTONE, "Special ringing tone"},
{ RTP_BUSYTONE, "Busy tone"},
{ RTP_CNGTONE, "Congestion tone"},
{ RTP_SPINFOTN, "Special information tone"},
{ RTP_CMFTTONE, "Comfort tone"},
{ RTP_HOLDTONE, "Hold tone"},
{ RTP_RECTONE, "Record tone"},
{ RTP_CLRWTTONE, "Caller waiting tone"},
{ RTP_CWTONE, "Call waiting tone"},
{ RTP_PAYTONE, "Pay tone"},
{ RTP_POSINDTONE, "Positive indication tone"},
{ RTP_NEGINDTONE, "Negative indication tone"},
{ RTP_WARNTONE, "Warning tone"},
{ RTP_INTRTONE, "Intrusion tone"},
{ RTP_CALLCDTONE, "Calling card service tone"},
{ RTP_PAYPHONE, "Payphone recognition tone"},
{ RTP_CAS, "CPE alerting signal (CAS)"},
{ RTP_OFFHKWARN, "Off-hook warning tone"},
{ RTP_RING, "Ring"},
{ RTP_ACCPTTONE, "Acceptance tone"},
{ RTP_CONFIRMTN, "Confirmation tone"},
{ RTP_DLTNRECALL, "Dial tone, recall"},
{ RTP_END3WAYTN, "End of three party service tone"},
{ RTP_FACTONE, "Facilities tone"},
{ RTP_LNLOCKTN, "Line lockout tone"},
{ RTP_NUMUNOBT, "Number unobtainable tone"},
{ RTP_OFFERGTONE, "Offering tone"},
{ RTP_PERMSIGTN, "Permanent signal tone"},
{ RTP_PREEMPTTN, "Preemption tone"},
{ RTP_QUETONE, "Queue tone"},
{ RTP_REFUSALTN, "Refusal tone"},
{ RTP_ROUTETONE, "Route tone"},
{ RTP_VALIDTONE, "Valid tone"},
{ RTP_WAITGTONE, "Waiting tone"},
{ RTP_WARNEOPTN, "Warning tone (end of period)"},
{ RTP_WARNPIPTN, "Warning Tone (PIP tone)"},
{ 115, "North American SIT Segment 1 Low" }, // [GR - 674]
{ 116, "North American SIT Segment 1 High" }, // [GR - 674]
{ 117, "North American SIT Segment 2 Low" }, // [GR - 674]
{ 118, "North American SIT Segment 2 High" }, // [GR - 674]
{ 119, "North American SIT Segment 3" }, // [GR - 674]
{ 120, "North American Coin Deposit" }, // [GR - 506]
{ 121, "Continuity check - tone" }, // [RFC5244]
{ 122, "Continuity verify - tone" }, // [RFC5244]
{ 123, "MF Code 11 (SS No. 5) or KP3P / ST3P(R1) or North American Ringback" }, // [GR-506]
{ 124, "MF KP(SS No. 5) or KP1(R1) or North American Coin Return" }, // [GR-506]
{ 125, "MF KP2(SS No. 5) or KP2P / ST2P(R1)" }, // [RFC5244]
{ 126, "MF ST(SS No. 5 and R1) or North American Coin Collect / Operator Released" }, // [GR-506]
{ 127, "MF Code 12 (SS No. 5) or KP'/STP (R1)" },
{ RTP_MF0, "MF 0"},
{ RTP_MF1, "MF 1"},
{ RTP_MF2, "MF 2"},
{ RTP_MF3, "MF 3"},
{ RTP_MF4, "MF 4"},
{ RTP_MF5, "MF 5"},
{ RTP_MF6, "MF 6"},
{ RTP_MF7, "MF 7"},
{ RTP_MF8, "MF 8"},
{ RTP_MF9, "MF 9"},
{ RTP_K0, "MF K0 or KP (start-of-pulsing)"},
{ RTP_K1, "MF K1"},
{ RTP_K2, "MF K2"},
{ RTP_S0, "MF S0 to ST (end-of-pulsing)"},
{ RTP_S1, "MF S1"},
{ RTP_S3, "MF S3"},
{ 144, "ABCD signalling state '0000'" }, // [RFC5244]
{ 145, "ABCD signalling state '0001'" }, // [RFC5244]
{ 146, "ABCD signalling state '0010'" }, // [RFC5244]
{ 147, "ABCD signalling state '0011'" }, // [RFC5244]
{ 148, "ABCD signalling state '0100'" }, // [RFC5244]
{ 149, "ABCD signalling state '0101'" }, // [RFC5244]
{ 150, "ABCD signalling state '0110'" }, // [RFC5244]
{ 151, "ABCD signalling state '0111'" }, // [RFC5244]
{ 152, "ABCD signalling state '1000'" }, // [RFC5244]
{ 153, "ABCD signalling state '1001'" }, // [RFC5244]
{ 154, "ABCD signalling state '1010'" }, // [RFC5244]
{ 155, "ABCD signalling state '1011'" }, // [RFC5244]
{ 156, "ABCD signalling state '1100'" }, // [RFC5244]
{ 157, "ABCD signalling state '1101'" }, // [RFC5244]
{ 158, "ABCD signalling state '1110'" }, // [RFC5244]
{ 159, "ABCD signalling state '1111'" }, // [RFC5244]
{ RTP_WINK, "Wink"},
{ RTP_WINKOFF, "Wink off"},
{ RTP_INCSEIZ, "Incoming seizure"},
{ RTP_SEIZURE, "Seizure"},
{ RTP_UNSEIZE, "Unseize circuit"},
{ RTP_COT, "Continuity test"},
{ RTP_DEFCOT, "Default continuity tone"},
{ RTP_COTTONE, "Continuity tone (single tone)"},
{ RTP_COTSEND, "Continuity test send"},
{ RTP_COTVERFD, "Continuity verified"},
{ RTP_LOOPBACK, "Loopback"},
{ RTP_MWATTTONE, "Old milliwatt tone (1000 Hz)"},
{ RTP_NEWMWATTTN, "New milliwatt tone (1004 Hz)"},
{ 174, "Metering pulse" }, // [RFC5244]
{ 175, "Trunk unavailable" }, // [RFC5244]
{ 176, "MFC forward signal 1" }, // [RFC5244]
{ 177, "MFC forward signal 2" }, // [RFC5244]
{ 178, "MFC forward signal 3" }, // [RFC5244]
{ 179, "MFC forward signal 4" }, // [RFC5244]
{ 180, "MFC forward signal 5" }, // [RFC5244]
{ 181, "MFC forward signal 6" }, // [RFC5244]
{ 182, "MFC forward signal 7" }, // [RFC5244]
{ 183, "MFC forward signal 8" }, // [RFC5244]
{ 184, "MFC forward signal 9" }, // [RFC5244]
{ 185, "MFC forward signal 10" }, // [RFC5244]
{ 186, "MFC forward signal 11" }, // [RFC5244]
{ 187, "MFC forward signal 12" }, // [RFC5244]
{ 188, "MFC forward signal 13" }, // [RFC5244]
{ 189, "MFC forward signal 14" }, // [RFC5244]
{ 190, "MFC forward signal 15" }, // [RFC5244]
{ 191, "MFC backward signal 1" }, // [RFC5244]
//{ 192, "MFC backward signal 2" }, // [RFC5244]
//193 MFC backward signal 3[RFC5244]
//194 MFC backward signal 4[RFC5244]
//195 MFC backward signal 5[RFC5244]
//196 MFC backward signal 6[RFC5244]
//197 MFC backward signal 7[RFC5244]
//198 MFC backward signal 8[RFC5244]
//199 MFC backward signal 9[RFC5244]
//200 MFC backward signal 10[RFC5244]
//201 MFC backward signal 11[RFC5244]
//202 MFC backward signal 12[RFC5244]
//203 MFC backward signal 13[RFC5244]
//204 MFC backward signal 14[RFC5244]
//205 MFC backward signal 15[RFC5244]
//206 A bit signalling state '0'[RFC5244]
//207 A bit signalling state '1'[RFC5244]
//208 AB bit signalling state '00'[RFC5244]
//209 AB bit signalling state '01'[RFC5244]
//210 AB bit signalling state '10'[RFC5244]
//211 AB bit signalling state '11' [RFC5244]
{ RTP_CISCO_NSE_FAX_PASSTHROUGH_IND, "Cisco NSE: Shift to voiceband data mode"},
{ RTP_CISCO_NSE_MODEM_PASSTHROUGH_IND, "Cisco NSE: Disable echo cancellation"},
{ RTP_CISCO_NSE_VOICE_MODE_IND, "Cisco NSE: Shift to voice mode"},
{ RTP_CISCO_NSE_MODEM_RELAY_CAP_IND, "Cisco NSE: Advertise Modem relay capability"},
{ RTP_CISCO_NSE_FAX_RELAY_IND, "Cisco NSE: Shift to fax relay mode"},
{ RTP_CISCO_NSE_ACK, "Positive acknowledgement of Cisco NSE"},
{ RTP_CISCO_NSE_NACK, "Negative acknowledgement of Cisco NSE"},
{ RTP_CISCO_NSE_MODEM_RELAY_IND , "Cisco NSE: Shift to modem relay mode"},
{ 0, NULL },
};
value_string_ext rtp_event_type_values_ext = VALUE_STRING_EXT_INIT(rtp_event_type_values);
/* RTP Events fields defining a subtree */
static gint ett_rtp_events = -1;
static dissector_handle_t rtp_events_handle;
static struct _rtp_event_info rtp_event_info;
static int
dissect_rtp_events( tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_ )
{
proto_item *ti;
proto_tree *rtp_events_tree;
unsigned int offset = 0;
struct _rtp_packet_info *p_packet_data;
guint8 rtp_evt;
guint8 octet;
static int * const events[] = {
&hf_rtp_events_end,
&hf_rtp_events_reserved,
&hf_rtp_events_volume,
NULL
};
col_set_str(pinfo->cinfo, COL_PROTOCOL, "RTP EVENT");
col_clear(pinfo->cinfo, COL_INFO);
/* Get event fields */
rtp_evt = tvb_get_guint8(tvb, offset );
/* get tap info */
rtp_event_info.info_rtp_evt = rtp_evt;
p_packet_data = (struct _rtp_packet_info *)p_get_proto_data(wmem_file_scope(), pinfo, proto_get_id_by_filter_name("rtp"), RTP_CONVERSATION_PROTO_DATA);
if (p_packet_data)
rtp_event_info.info_setup_frame_num = p_packet_data->frame_number;
else
rtp_event_info.info_setup_frame_num = 0;
col_add_fstr( pinfo->cinfo, COL_INFO,
"Payload type=RTP Event, %s",
val_to_str_ext( rtp_evt, &rtp_event_type_values_ext, "Unknown (%u)" ));
ti = proto_tree_add_item( tree, proto_rtp_events, tvb, offset, -1, ENC_NA );
rtp_events_tree = proto_item_add_subtree( ti, ett_rtp_events );
proto_tree_add_uint ( rtp_events_tree, hf_rtp_events_event, tvb, offset, 1, rtp_evt);
offset++;
octet = tvb_get_guint8(tvb, offset);
proto_tree_add_bitmask_list(rtp_events_tree, tvb, offset, 1, events, ENC_NA);
offset++;
/* The duration field indicates the duration of the event or segment
* being reported, in timestamp units.
*/
rtp_event_info.info_duration = tvb_get_ntohs(tvb, offset);
proto_tree_add_item ( rtp_events_tree, hf_rtp_events_duration, tvb, offset, 2, ENC_BIG_ENDIAN);
/* set the end info for the tap */
if (octet & 0x80)
{
rtp_event_info.info_end = TRUE;
} else
{
rtp_event_info.info_end = FALSE;
}
/* Make end-of-event packets obvious in the info column */
if ((octet & 0x80))
{
col_append_str(pinfo->cinfo, COL_INFO, " (end)");
}
tap_queue_packet(rtp_event_tap, pinfo, &rtp_event_info);
return tvb_captured_length(tvb);
}
void
proto_register_rtp_events(void)
{
module_t *rtp_events_module;
static hf_register_info hf[] =
{
{
&hf_rtp_events_event,
{
"Event ID",
"rtpevent.event_id",
FT_UINT8,
BASE_DEC | BASE_EXT_STRING,
&rtp_event_type_values_ext,
0x0,
NULL, HFILL
}
},
{
&hf_rtp_events_end,
{
"End of Event",
"rtpevent.end_of_event",
FT_BOOLEAN,
8,
NULL,
0x80,
NULL, HFILL
}
},
{
&hf_rtp_events_reserved,
{
"Reserved",
"rtpevent.reserved",
FT_BOOLEAN,
8,
NULL,
0x40,
NULL, HFILL
}
},
{
&hf_rtp_events_volume,
{
"Volume",
"rtpevent.volume",
FT_UINT8,
BASE_DEC,
NULL,
0x3F,
NULL, HFILL
}
},
{
&hf_rtp_events_duration,
{
"Event Duration",
"rtpevent.duration",
FT_UINT16,
BASE_DEC,
NULL,
0x0,
NULL, HFILL
}
},
};
static gint *ett[] =
{
&ett_rtp_events,
};
proto_rtp_events = proto_register_protocol("RFC 2833 RTP Event", "RTP Event", "rtpevent");
proto_register_field_array(proto_rtp_events, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
/* Register preferences */
rtp_events_module = prefs_register_protocol (proto_rtp_events, NULL);
prefs_register_obsolete_preference(rtp_events_module, "event_payload_type_value");
prefs_register_obsolete_preference(rtp_events_module, "cisco_nse_payload_type_value");
rtp_events_handle = register_dissector("rtpevent", dissect_rtp_events, proto_rtp_events);
rtp_event_tap = register_tap("rtpevent");
}
void
proto_reg_handoff_rtp_events(void)
{
dissector_add_string("rtp_dyn_payload_type", "telephone-event", rtp_events_handle);
dissector_add_string("rtp_dyn_payload_type", "X-NSE", rtp_events_handle);
dissector_add_uint_range_with_preference("rtp.pt", RTP_EVENT_DEFAULT_PT_RANGE, rtp_events_handle);
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 8
* tab-width: 8
* indent-tabs-mode: t
* End:
*
* vi: set shiftwidth=8 tabstop=8 noexpandtab:
* :indentSize=8:tabSize=8:noTabs=false:
*/
|
