summaryrefslogtreecommitdiffstats
path: root/epan/dissectors/packet-btrfcomm.c
blob: 6e90c9e38aa8094c67cefca3d63e28cd64d20ef8 (plain)
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
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
/* packet-btrfcomm.c
 * Routines for Bluetooth RFCOMM protocol dissection
 * and RFCOMM based profile dissection:
 *    - Dial-Up Networking Profile (DUN)
 *    - Serial Port Profile (SPP)
 *    - Global Navigation Satellite System (GNSS)
 *
 * Copyright 2002, Wolfgang Hansmann <hansmann@cs.uni-bonn.de>
 *
 * Refactored for wireshark checkin
 *   Ronnie Sahlberg 2006
 *
 * Wireshark - Network traffic analyzer
 * By Gerald Combs <gerald@wireshark.org>
 * Copyright 1998 Gerald Combs
 *
 * SPDX-License-Identifier: GPL-2.0-or-later
 */

#include "config.h"

#include <epan/packet.h>
#include <epan/prefs.h>
#include <epan/expert.h>
#include <epan/uat.h>
#include <epan/decode_as.h>
#include <epan/proto_data.h>

#include "packet-bluetooth.h"
#include "packet-btsdp.h"
#include "packet-btl2cap.h"
#include "packet-btrfcomm.h"

static int hf_pf = -1;
static int hf_ea = -1;
static int hf_len = -1;
static int hf_frame_type = -1;
static int hf_cr = -1;
static int hf_dlci = -1;
static int hf_channel = -1;
static int hf_direction = -1;
static int hf_priority = -1;
static int hf_error_recovery_mode = -1;
static int hf_max_frame_size = -1;
static int hf_max_retrans = -1;
static int hf_fc_credits = -1;

static int hf_mcc_pn_parameters = -1;
static int hf_pn_i14 = -1;
static int hf_pn_c14 = -1;

static int hf_mcc = -1;
static int hf_mcc_types = -1;
static int hf_mcc_len = -1;
static int hf_mcc_ea = -1;
static int hf_mcc_cr = -1;
static int hf_mcc_cmd = -1;

static int hf_msc_parameters = -1;
static int hf_msc_fc = -1;
static int hf_msc_rtc = -1;
static int hf_msc_rtr = -1;
static int hf_msc_ic = -1;
static int hf_msc_dv = -1;
static int hf_msc_l = -1;
static int hf_msc_break_bits = -1;

static int hf_fcs = -1;

static int hf_dun_at_cmd = -1;
static int hf_spp_data = -1;
static int hf_gnss_data = -1;

static int hf_mcc_dlci = -1;
static int hf_mcc_channel = -1;
static int hf_mcc_direction = -1;
static int hf_mcc_const_1 = -1;

static int hf_mcc_pn_dlci = -1;
static int hf_mcc_pn_channel = -1;
static int hf_mcc_pn_direction = -1;
static int hf_mcc_pn_zeros_padding = -1;

static int hf_acknowledgement_timer_t1 = -1;
static int hf_address = -1;
static int hf_control = -1;

/* Initialize the protocol and registered fields */
int proto_btrfcomm = -1;
static int proto_btdun = -1;
static int proto_btspp = -1;
static int proto_btgnss = -1;

/* Initialize the subtree pointers */
static gint ett_btrfcomm = -1;
static gint ett_btrfcomm_ctrl = -1;
static gint ett_addr = -1;
static gint ett_control = -1;
static gint ett_mcc = -1;
static gint ett_ctrl_pn_ci = -1;
static gint ett_ctrl_pn_v24 = -1;
static gint ett_dlci = -1;
static gint ett_mcc_dlci = -1;

static gint ett_btdun = -1;
static gint ett_btspp = -1;
static gint ett_btgnss = -1;

static expert_field ei_btrfcomm_mcc_length_bad = EI_INIT;

static dissector_handle_t btrfcomm_handle;
static dissector_handle_t btdun_handle;
static dissector_handle_t btspp_handle;
static dissector_handle_t btgnss_handle;

static dissector_table_t rfcomm_dlci_dissector_table;

static wmem_tree_t *service_directions = NULL;

typedef struct {
    guint32  direction;
    guint32  end_in;
} service_direction_t;

typedef struct {
    guint               channel;
    gchar*              payload_proto_name;
    dissector_handle_t  payload_proto;
} uat_rfcomm_channels_t;

static gboolean               rfcomm_channels_enabled   = FALSE;
static uat_t                  *uat_rfcomm_channels      = NULL;
static uat_rfcomm_channels_t  *rfcomm_channels          = NULL;
static guint                  num_rfcomm_channels       = 0;

UAT_DEC_CB_DEF(rfcomm_channels, channel, uat_rfcomm_channels_t)
UAT_DISSECTOR_DEF(rfcomm_channels, payload_proto, payload_proto, payload_proto_name, uat_rfcomm_channels_t)

static uat_field_t uat_rfcomm_channels_fields[] = {
    UAT_FLD_DEC(rfcomm_channels, channel, "RFCOMM Channel",
            "Range: 0-32"),
    UAT_FLD_DISSECTOR(rfcomm_channels, payload_proto, "Payload dissector",
            "Dissector name used to decode RFCOMM channel"),
    UAT_END_FIELDS
};

static dissector_handle_t ppp_handle;

static const value_string vs_ctl_pn_i[] = {
    {0x0, "use UIH Frames"},
#if 0    /* specified by 07.10, but not used by RFCOMM */
    {0x1, "use UI Frames"},
    {0x2, "use I Frames"},
#endif
    {0, NULL}
};

static const value_string vs_ctl_pn_cl[] = {

    {0x0, "no credit based flow control scheme"},
    {0xe, "support of credit based flow control scheme (resp)"},
    {0xf, "support of credit based flow control scheme (req)"},
#if 0    /* specified by 07.10. Redefined by RFCOMM */
    {0x0, "type 1 (unstructured octet stream)"},
    {0x1, "type 2 (unstructured octet stream with flow control)"},
    {0x2, "type 3 (uninterruptible framed data)"},
    {0x3, "type 4 (interruptible framed data)"},
#endif
    {0, NULL}
};


static const value_string vs_frame_type[] = {
    /* masked 0xef */
    {0x2f, "Set Asynchronous Balanced Mode (SABM)"},
    {0x63, "Unnumbered Acknowledgement (UA)"},
    {0x0f, "Disconnected Mode (DM)"},
    {0x43, "Disconnect (DISC)"},
    {0xef, "Unnumbered Information with Header check (UIH)"},
#if 0    /* specified by 07.10, but not used by RFCOMM */
       {0x03, "Unnumbered Information (UI)"},
#endif
        {0, NULL}
};


static const value_string vs_frame_type_short[] = {
    /* masked 0xef */
    {0x2f, "SABM"},
    {0x63, "UA"},
    {0x0f, "DM"},
    {0x43, "DISC"},
    {0xef, "UIH"},
#if 0    /* specified by 07.10, but not used by RFCOMM */
    {0x03, "UI"},
#endif
        {0, NULL}
};

#define FRAME_TYPE_SABM  0x2F
#define FRAME_TYPE_UIH   0xEF

static const value_string vs_ctl[] = {
       /* masked 0xfc */
    {0x20, "DLC Parameter Negotiation (PN)"},
    {0x08, "Test Command (Test)"},
    {0x28, "Flow Control On Command (FCon)"},
    {0x18, "Flow Control Off Command (FCoff)"},
    {0x38, "Modem Status Command (MSC)"},
    {0x04, "Non Supported Command Response (NSC)"},
    {0x24, "Remote Port Negotiation Command (RPN)"},
    {0x14, "Remote Line Status Command (RLS)"},
#if 0    /* Specified by 07.10, but not used by RFCOMM */
    {0x10, "Power Saving Control (PSC)"},
    {0x30, "Multiplexer close down (CLD)"},
    {0x34, "Service Negotiation Command (SNC)"},
#endif
#if 0     /* old */
    {0x80, "DLC parameter negotiation (PN)"},
    {0x20, "Test Command (Test)"},
    {0xa0, "Flow Control On Command (FCon)"},
    {0x60, "Flow Control Off Command (FCoff)"},
    {0xe0, "Modem Status Command (MSC)"},
    {0x10, "Non Supported Command Response (NSC)"},
    {0x90, "Remote Port Negotiation Command (RPN)"},
    {0x50, "Remote Line Status Command (RLS)"},
    {0x40, "Power Saving Control (PSC)"},
    {0xc0, "Multiplexer close down (CLD)"},
    {0xd0, "Service Negotiation Command (SNC)"},
#endif
    {0x0, NULL}
};

static const value_string vs_ea[] = {
    {1, "Last field octet"},
    {0, "More field octets following"},
    {0, NULL}
};

void proto_register_btrfcomm(void);
void proto_reg_handoff_btrfcomm(void);
void proto_register_btdun(void);
void proto_reg_handoff_btdun(void);
void proto_register_btspp(void);
void proto_reg_handoff_btspp(void);
void proto_register_btgnss(void);
void proto_reg_handoff_btgnss(void);

#define PROTO_DATA_BTRFCOMM_DIRECTED_CHANNEL  0

static void btrfcomm_directed_channel_prompt(packet_info *pinfo, gchar* result)
{
    guint8 *value_data;

    value_data = (guint8 *) p_get_proto_data(pinfo->pool, pinfo, proto_btrfcomm, PROTO_DATA_BTRFCOMM_DIRECTED_CHANNEL);
    if (value_data)
        snprintf(result, MAX_DECODE_AS_PROMPT_LEN, "RFCOMM Channel %d (direction: %u) as", (guint) (*value_data) >> 1, (guint) (*value_data) & 1);
    else
        snprintf(result, MAX_DECODE_AS_PROMPT_LEN, "Unknown RFCOMM Channel");
}

static gpointer btrfcomm_directed_channel_value(packet_info *pinfo)
{
    guint8 *value_data;

    value_data = (guint8 *) p_get_proto_data(pinfo->pool, pinfo, proto_btrfcomm, PROTO_DATA_BTRFCOMM_DIRECTED_CHANNEL);

    if (value_data)
        return GUINT_TO_POINTER((gulong)*value_data);

    return NULL;
}

static dissector_handle_t
find_proto_by_channel(guint channel) {
    guint i_channel;

    for (i_channel = 0; i_channel < num_rfcomm_channels; ++i_channel) {
        if (rfcomm_channels[i_channel].channel == channel) {
            return rfcomm_channels[i_channel].payload_proto;
        }
    }
    return NULL;
}

static int
get_le_multi_byte_value(tvbuff_t *tvb, int offset, proto_tree *tree, guint32 *val_ptr, int hf_index)
{
    guint8  byte, bc     = 0;
    guint32 val          = 0;
    int     start_offset = offset;

    do {
        byte = tvb_get_guint8(tvb, offset);
        offset += 1;
        val |= ((byte >> 1) & 0xff) << (bc++ * 7);
    } while (((byte & 0x1) == 0) && (bc <= 4));

    *val_ptr = val;

    if (hf_index > 0) {
        proto_tree_add_uint(tree, hf_index, tvb, start_offset, offset - start_offset, val);
    }

    return offset;
}


static int
dissect_ctrl_pn(proto_tree *t, tvbuff_t *tvb, int offset, guint8 *mcc_channel)
{
    proto_tree   *st;
    proto_item   *ti;
    proto_tree   *dlci_tree;
    proto_item   *dlci_item;
    proto_item   *item;
    int           mcc_dlci;
    guint8        flags;

    proto_tree_add_item(t, hf_mcc_pn_zeros_padding, tvb, offset, 1, ENC_LITTLE_ENDIAN);

    /* mcc dlci */
    mcc_dlci = tvb_get_guint8(tvb, offset) & 0x3f;
    *mcc_channel = mcc_dlci >> 1;

    dlci_item = proto_tree_add_item(t, hf_mcc_pn_dlci, tvb, offset, 1, ENC_LITTLE_ENDIAN);
    proto_item_append_text(dlci_item, " (Direction: %d, Channel: %u)", mcc_dlci & 0x01, *mcc_channel);

    dlci_tree = proto_item_add_subtree(dlci_item, ett_mcc_dlci);
    proto_tree_add_item(dlci_tree, hf_mcc_pn_channel, tvb, offset, 1, ENC_LITTLE_ENDIAN);
    proto_tree_add_item(dlci_tree, hf_mcc_pn_direction, tvb, offset, 1, ENC_LITTLE_ENDIAN);
    offset += 1;

    flags = tvb_get_guint8(tvb, offset);

    ti = proto_tree_add_none_format(t, hf_mcc_pn_parameters, tvb, offset, 1, "I1-I4: 0x%x, C1-C4: 0x%x", flags & 0xf, (flags >> 4) & 0xf);
    st = proto_item_add_subtree(ti, ett_ctrl_pn_ci);

    proto_tree_add_item(st, hf_pn_c14, tvb, offset, 1, ENC_LITTLE_ENDIAN);
    proto_tree_add_item(st, hf_pn_i14, tvb, offset, 1, ENC_LITTLE_ENDIAN);
    offset += 1;

    /* priority */
    proto_tree_add_item(t, hf_priority, tvb, offset, 1, ENC_LITTLE_ENDIAN);
    offset += 1;

    /* Ack timer */
    item = proto_tree_add_item(t, hf_acknowledgement_timer_t1, tvb, offset, 1, ENC_LITTLE_ENDIAN);
    proto_item_append_text(item, "(%d ms)", (guint32)tvb_get_guint8(tvb, offset) * 100);
    offset += 1;

    /* max frame size */
    proto_tree_add_item(t, hf_max_frame_size, tvb, offset, 2, ENC_LITTLE_ENDIAN);
    offset += 2;

    /* max retrans */
    proto_tree_add_item(t, hf_max_retrans, tvb, offset, 1, ENC_LITTLE_ENDIAN);
    offset += 1;

    /* error recovery mode */
    proto_tree_add_item(t, hf_error_recovery_mode, tvb, offset, 1, ENC_LITTLE_ENDIAN);
    offset += 1;

    return offset;
}

static int
dissect_ctrl_msc(proto_tree *t, tvbuff_t *tvb, int offset, int length, guint8 *mcc_channel)
{

    proto_tree *st;
    proto_item *it;
    proto_tree *dlci_tree;
    proto_item *dlci_item;
    guint8      mcc_dlci;
    guint8      status;
    int         start_offset;

    mcc_dlci = tvb_get_guint8(tvb, offset) >> 2;
    *mcc_channel = mcc_dlci >> 1;

    dlci_item = proto_tree_add_item(t, hf_mcc_dlci, tvb, offset, 1, ENC_LITTLE_ENDIAN);
    proto_item_append_text(dlci_item, " (Direction: %d, Channel: %u)", mcc_dlci & 0x01, *mcc_channel);

    dlci_tree = proto_item_add_subtree(dlci_item, ett_mcc_dlci);
    proto_tree_add_item(dlci_tree, hf_mcc_channel, tvb, offset, 1, ENC_LITTLE_ENDIAN);
    proto_tree_add_item(dlci_tree, hf_mcc_direction, tvb, offset, 1, ENC_LITTLE_ENDIAN);

    proto_tree_add_item(t, hf_mcc_const_1, tvb, offset, 1, ENC_LITTLE_ENDIAN);
    proto_tree_add_item(t, hf_mcc_ea, tvb, offset, 1, ENC_LITTLE_ENDIAN);

    offset += 1;

    start_offset = offset;
    status       = tvb_get_guint8(tvb, offset);
    it = proto_tree_add_none_format(t, hf_msc_parameters, tvb, offset, 1, "V.24 Signals: FC = %d, RTC = %d, RTR = %d, IC = %d, DV = %d", (status >> 1) & 1,
                 (status >> 2) & 1, (status >> 3) & 1,
                 (status >> 6) & 1, (status >> 7) & 1);
    st = proto_item_add_subtree(it, ett_ctrl_pn_v24);

    proto_tree_add_item(st, hf_msc_fc,  tvb, offset, 1, ENC_LITTLE_ENDIAN);
    proto_tree_add_item(st, hf_msc_rtc, tvb, offset, 1, ENC_LITTLE_ENDIAN);
    proto_tree_add_item(st, hf_msc_rtr, tvb, offset, 1, ENC_LITTLE_ENDIAN);
    proto_tree_add_item(st, hf_msc_ic,  tvb, offset, 1, ENC_LITTLE_ENDIAN);
    proto_tree_add_item(st, hf_msc_dv,  tvb, offset, 1, ENC_LITTLE_ENDIAN);
    offset += 1;

    if (length == 3) {
        proto_tree_add_item(t, hf_msc_break_bits, tvb, offset, 1, ENC_LITTLE_ENDIAN);
        proto_tree_add_item(t, hf_msc_l, tvb, offset, 1, ENC_LITTLE_ENDIAN);
        offset += 1;
    }

    proto_item_set_len(it, offset - start_offset);

    return offset;
}

static int
dissect_btrfcomm_address(tvbuff_t *tvb, packet_info *pinfo, int offset, proto_tree *tree, guint8 *ea_flagp, guint8 *cr_flagp, guint8 *dlcip)
{
    proto_item *ti;
    proto_tree *addr_tree;
    proto_tree *dlci_tree = NULL;
    proto_item *dlci_item = NULL;
    guint8      dlci, cr_flag, ea_flag, flags, channel;

    flags = tvb_get_guint8(tvb, offset);

    ea_flag = flags & 0x01;
    if (ea_flagp) {
        *ea_flagp = ea_flag;
    }

    cr_flag = (flags & 0x02) ? 1 : 0;
    if (cr_flagp) {
        *cr_flagp = cr_flag;
    }

    dlci = flags >> 2;
    if (dlcip) {
        *dlcip = dlci;
    }

    ti = proto_tree_add_none_format(tree, hf_address, tvb, offset, 1, "Address: E/A flag: %d, C/R flag: %d, Direction: %d, Channel: %u", ea_flag, cr_flag, dlci & 0x01, dlci >> 1);
    addr_tree = proto_item_add_subtree(ti, ett_addr);

    dlci_item = proto_tree_add_item(addr_tree, hf_dlci, tvb, offset, 1, ENC_LITTLE_ENDIAN);
    channel = dlci >> 1;
    proto_item_append_text(dlci_item, " (Direction: %d, Channel: %u)", dlci & 0x01, channel);

    if (p_get_proto_data(pinfo->pool, pinfo, proto_btrfcomm, PROTO_DATA_BTRFCOMM_DIRECTED_CHANNEL) == NULL) {
        guint8 *value_data;

        value_data = wmem_new(wmem_file_scope(), guint8);
        *value_data = dlci;

        p_add_proto_data(pinfo->pool, pinfo, proto_btrfcomm, PROTO_DATA_BTRFCOMM_DIRECTED_CHANNEL, value_data);
    }

    dlci_tree = proto_item_add_subtree(dlci_item, ett_dlci);
    proto_tree_add_item(dlci_tree, hf_channel, tvb, offset, 1, ENC_LITTLE_ENDIAN);
    proto_tree_add_item(dlci_tree, hf_direction, tvb, offset, 1, ENC_LITTLE_ENDIAN);

    proto_tree_add_item(addr_tree, hf_cr, tvb, offset, 1, ENC_LITTLE_ENDIAN);
    proto_tree_add_item(addr_tree, hf_ea, tvb, offset, 1, ENC_LITTLE_ENDIAN);
    offset += 1;

    return offset;
}

static int
dissect_btrfcomm_control(tvbuff_t *tvb, int offset, proto_tree *tree, guint8 *pf_flagp, guint8 *frame_typep)
{
    proto_item *ti;
    proto_tree *hctl_tree;
    guint8      frame_type, pf_flag, flags;

    flags = tvb_get_guint8(tvb, offset);

    pf_flag = (flags & 0x10) ? 1 : 0;
    if (pf_flagp) {
        *pf_flagp = pf_flag;
    }

    frame_type = flags & 0xef;
    if (frame_typep) {
        *frame_typep = frame_type;
    }

    ti = proto_tree_add_none_format(tree, hf_control, tvb, offset, 1, "Control: Frame type: %s (0x%x), P/F flag: %d",
                             val_to_str_const(frame_type, vs_frame_type, "Unknown"), frame_type, pf_flag);
    hctl_tree = proto_item_add_subtree(ti, ett_control);

    proto_tree_add_item(hctl_tree, hf_pf,         tvb, offset, 1, ENC_LITTLE_ENDIAN);
    proto_tree_add_item(hctl_tree, hf_frame_type, tvb, offset, 1, ENC_LITTLE_ENDIAN);

    offset += 1;
    return offset;
}



static int
dissect_btrfcomm_payload_length(tvbuff_t *tvb, int offset, proto_tree *tree, guint16 *frame_lenp)
{
    guint16 frame_len;
    int     start_offset = offset;

    frame_len = tvb_get_guint8(tvb, offset);
    offset += 1;

    if (frame_len & 0x01) {
        frame_len >>= 1; /* 0 - 127 */
    } else {
        frame_len >>= 1; /* 128 - ... */
        frame_len |= (tvb_get_guint8(tvb, offset)) << 7;
        offset += 1;
    }

    proto_tree_add_uint(tree, hf_len, tvb, start_offset, offset - start_offset, frame_len);

    if (frame_lenp) {
        *frame_lenp = frame_len;
    }

    return offset;
}

static int
dissect_btrfcomm_MccType(tvbuff_t *tvb, int offset, proto_tree *tree, guint8 *mcc_cr_flagp, guint8 *mcc_ea_flagp, guint32 *mcc_typep)
{
    int         start_offset = offset;
    proto_item *ti;
    proto_tree *mcc_tree;
    guint8      flags, mcc_cr_flag, mcc_ea_flag;
    guint32     mcc_type;

    flags = tvb_get_guint8(tvb, offset);

    mcc_cr_flag = (flags & 0x2) ? 1 : 0;
    if (mcc_cr_flagp) {
        *mcc_cr_flagp = mcc_cr_flag;
    }

    mcc_ea_flag = flags & 0x1;
    if (mcc_ea_flagp) {
        *mcc_ea_flagp = mcc_ea_flag;
    }

    offset = get_le_multi_byte_value(tvb, offset, tree, &mcc_type, -1);
    mcc_type = (mcc_type >> 1) & 0x3f; /* shift c/r flag off */
    if (mcc_typep) {
        *mcc_typep = mcc_type;
    }

    ti = proto_tree_add_none_format(tree, hf_mcc_types, tvb, start_offset, offset - start_offset,
                             "Type: %s (0x%x), C/R flag = %d, E/A flag = %d",
                             val_to_str_const(mcc_type, vs_ctl, "Unknown"),
                             mcc_type, mcc_cr_flag, mcc_ea_flag);
    mcc_tree = proto_item_add_subtree(ti, ett_mcc);

    proto_tree_add_item(mcc_tree, hf_mcc_cmd, tvb, start_offset, offset - start_offset, ENC_LITTLE_ENDIAN);
    proto_tree_add_item(mcc_tree, hf_mcc_cr, tvb, start_offset, 1, ENC_LITTLE_ENDIAN);
    proto_tree_add_item(mcc_tree, hf_mcc_ea, tvb, start_offset, 1, ENC_LITTLE_ENDIAN);

    return offset;
}

static gint
dissect_btrfcomm(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data)
{
    proto_item          *ti;
    proto_tree          *rfcomm_tree;
    gint                 offset     = 0;
    gint                 fcs_offset;
    guint8               dlci, cr_flag, ea_flag;
    guint8               frame_type, pf_flag;
    guint16              frame_len;
    btl2cap_data_t      *l2cap_data;
    service_info_t      *service_info = NULL;

    /* Reject the packet if data is NULL */
    if (data == NULL)
        return 0;
    l2cap_data = (btl2cap_data_t *) data;

    ti = proto_tree_add_item(tree, proto_btrfcomm, tvb, offset, tvb_captured_length(tvb), ENC_NA);
    rfcomm_tree = proto_item_add_subtree(ti, ett_btrfcomm);

    col_set_str(pinfo->cinfo, COL_PROTOCOL, "RFCOMM");

    switch (pinfo->p2p_dir) {
        case P2P_DIR_SENT:
            col_set_str(pinfo->cinfo, COL_INFO, "Sent ");
            break;
        case P2P_DIR_RECV:
            col_set_str(pinfo->cinfo, COL_INFO, "Rcvd ");
            break;
        default:
            col_set_str(pinfo->cinfo, COL_INFO, "UnknownDirection ");
            break;
    }

    /* flags and dlci */
    offset = dissect_btrfcomm_address(tvb, pinfo, offset, rfcomm_tree, &ea_flag, &cr_flag, &dlci);
    /* pf and frame type */
    offset = dissect_btrfcomm_control(tvb, offset, rfcomm_tree, &pf_flag, &frame_type);
    /* payload length */
    offset = dissect_btrfcomm_payload_length(tvb, offset, rfcomm_tree, &frame_len);

    if (dlci && (frame_len || (frame_type == FRAME_TYPE_UIH) || (frame_type == FRAME_TYPE_SABM))) {
        wmem_tree_key_t       key[10];
        guint32               k_interface_id;
        guint32               k_adapter_id;
        guint32               k_psm;
        guint32               k_direction;
        guint32               k_bd_addr_oui;
        guint32               k_bd_addr_id;
        guint32               k_service_type;
        guint32               k_frame_number;
        guint32               k_chandle;
        guint32               k_channel;
        guint32               k_dlci;
        service_direction_t  *service_direction;
        wmem_tree_t          *subtree;

        k_interface_id    = l2cap_data->interface_id;
        k_adapter_id      = l2cap_data->adapter_id;
        k_chandle         = l2cap_data->chandle;
        k_psm             = l2cap_data->psm;
        k_channel         = dlci >> 1;
        k_frame_number    = pinfo->num;
        k_dlci            = dlci;

        key[0].length = 1;
        key[0].key = &k_interface_id;
        key[1].length = 1;
        key[1].key = &k_adapter_id;
        key[2].length = 1;
        key[2].key = &k_chandle;
        key[3].length = 1;
        key[3].key = &k_psm;
        key[4].length = 1;
        key[4].key = &k_dlci;

        if (!pinfo->fd->visited && frame_type == FRAME_TYPE_SABM) {
            key[5].length = 0;
            key[5].key = NULL;

            subtree = (wmem_tree_t *) wmem_tree_lookup32_array(service_directions, key);
            service_direction = (subtree) ? (service_direction_t *) wmem_tree_lookup32_le(subtree, k_frame_number) : NULL;
            if (service_direction && service_direction->end_in == bluetooth_max_disconnect_in_frame) {
                service_direction->end_in = k_frame_number;
            }

            key[5].length = 1;
            key[5].key = &k_frame_number;
            key[6].length = 0;
            key[6].key = NULL;

            service_direction = wmem_new(wmem_file_scope(), service_direction_t);
            service_direction->direction = (pinfo->p2p_dir == P2P_DIR_RECV) ? P2P_DIR_SENT : P2P_DIR_RECV;
            service_direction->end_in = bluetooth_max_disconnect_in_frame;

            wmem_tree_insert32_array(service_directions, key, service_direction);
        }
        key[4].key = &k_channel;
        key[5].length = 0;
        key[5].key = NULL;

        subtree = (wmem_tree_t *) wmem_tree_lookup32_array(service_directions, key);
        service_direction = (subtree) ? (service_direction_t *) wmem_tree_lookup32_le(subtree, k_frame_number) : NULL;
        if (service_direction && service_direction->end_in > k_frame_number) {
            k_direction = service_direction->direction;
        } else {
            if (dlci & 0x01)
                k_direction = (l2cap_data->is_local_psm) ? P2P_DIR_RECV : P2P_DIR_SENT;
            else
                k_direction = (l2cap_data->is_local_psm) ? P2P_DIR_SENT : P2P_DIR_RECV;
        }

        k_psm = SDP_PSM_DEFAULT;
        if (k_direction == P2P_DIR_RECV) {
            k_bd_addr_oui     = l2cap_data->remote_bd_addr_oui;
            k_bd_addr_id      = l2cap_data->remote_bd_addr_id;
        } else {
            k_bd_addr_oui     = 0;
            k_bd_addr_id      = 0;
        }
        k_service_type    = BTSDP_RFCOMM_PROTOCOL_UUID;

        key[2].length = 1;
        key[2].key = &k_psm;
        key[3].length = 1;
        key[3].key = &k_direction;
        key[4].length = 1;
        key[4].key = &k_bd_addr_oui;
        key[5].length = 1;
        key[5].key = &k_bd_addr_id;
        key[6].length = 1;
        key[6].key = &k_service_type;
        key[7].length = 1;
        key[7].key = &k_channel;
        key[8].length = 1;
        key[8].key = &k_frame_number;
        key[9].length = 0;
        key[9].key = NULL;

        service_info = btsdp_get_service_info(key);

        if (service_info && service_info->interface_id == l2cap_data->interface_id &&
                service_info->adapter_id == l2cap_data->adapter_id &&
                service_info->sdp_psm == SDP_PSM_DEFAULT &&
                ((service_info->direction == P2P_DIR_RECV &&
                service_info->bd_addr_oui == l2cap_data->remote_bd_addr_oui &&
                service_info->bd_addr_id == l2cap_data->remote_bd_addr_id) ||
                (service_info->direction != P2P_DIR_RECV &&
                service_info->bd_addr_oui == 0 &&
                service_info->bd_addr_id == 0)) &&
                service_info->type == BTSDP_RFCOMM_PROTOCOL_UUID &&
                service_info->channel == (dlci >> 1)) {

        } else {
            service_info = wmem_new0(pinfo->pool, service_info_t);
        }
    }

    col_append_fstr(pinfo->cinfo, COL_INFO, "%s Channel=%u ",
                    val_to_str_const(frame_type, vs_frame_type_short, "Unknown"), dlci >> 1);
    if (dlci && (frame_type == FRAME_TYPE_SABM) && service_info) {
        if (service_info->uuid.size==16)
            col_append_fstr(pinfo->cinfo, COL_INFO, "(UUID128: %s) ", print_bluetooth_uuid(pinfo->pool, &service_info->uuid));
        else
            col_append_fstr(pinfo->cinfo, COL_INFO, "(%s) ",
                    val_to_str_ext_const(service_info->uuid.bt_uuid, &bluetooth_uuid_vals_ext, "Unknown"));
    }

    /* UID frame */
    if ((frame_type == FRAME_TYPE_UIH) && dlci && pf_flag) {
        col_append_str(pinfo->cinfo, COL_INFO, "UID ");

        /* add credit based flow control byte */
        proto_tree_add_item(rfcomm_tree, hf_fc_credits, tvb, offset, 1, ENC_LITTLE_ENDIAN);
        offset += 1;

    }

    fcs_offset = offset + frame_len;

    /* multiplexer control command */
    if (!dlci && frame_len) {
        proto_item *mcc_ti;
        proto_tree *ctrl_tree;
        proto_tree *dlci_tree;
        proto_item *dlci_item;
        guint32     mcc_type, length;
        guint8      mcc_cr_flag, mcc_ea_flag;
        guint8      mcc_channel;
        guint8      mcc_dlci;
        int         start_offset = offset;

        mcc_ti = proto_tree_add_item(rfcomm_tree, hf_mcc, tvb, offset, 1, ENC_NA);
        ctrl_tree = proto_item_add_subtree(mcc_ti, ett_btrfcomm_ctrl);

        /* mcc type */
        offset = dissect_btrfcomm_MccType(tvb, offset, ctrl_tree, &mcc_cr_flag, &mcc_ea_flag, &mcc_type);

        /* len */
        offset = get_le_multi_byte_value(tvb, offset, ctrl_tree, &length, hf_mcc_len);

        if (length > (guint32) tvb_reported_length_remaining(tvb, offset)) {
            expert_add_info_format(pinfo, ctrl_tree, &ei_btrfcomm_mcc_length_bad, "Huge MCC length: %u", length);
            return offset;
        }

        switch(mcc_type) {
        case 0x20: /* DLC Parameter Negotiation */
            dissect_ctrl_pn(ctrl_tree, tvb, offset, &mcc_channel);
            break;
        case 0x24: /* Remote Port Negotiation */
            mcc_dlci = tvb_get_guint8(tvb, offset) >> 2;
            mcc_channel = mcc_dlci >> 1;

            dlci_item = proto_tree_add_item(ctrl_tree, hf_mcc_dlci, tvb, offset, 1, ENC_LITTLE_ENDIAN);
            proto_item_append_text(dlci_item, " (Direction: %d, Channel: %u)", mcc_dlci & 0x01, mcc_channel);

            dlci_tree = proto_item_add_subtree(dlci_item, ett_mcc_dlci);
            proto_tree_add_item(dlci_tree, hf_mcc_channel, tvb, offset, 1, ENC_LITTLE_ENDIAN);
            proto_tree_add_item(dlci_tree, hf_mcc_direction, tvb, offset, 1, ENC_LITTLE_ENDIAN);

            proto_tree_add_item(ctrl_tree, hf_mcc_const_1, tvb, offset, 1, ENC_LITTLE_ENDIAN);
            proto_tree_add_item(ctrl_tree, hf_mcc_ea, tvb, offset, 1, ENC_LITTLE_ENDIAN);

            break;
        case 0x38: /* Modem Status Command */
            dissect_ctrl_msc(ctrl_tree, tvb, offset, length, &mcc_channel);
            break;
        default:
            mcc_channel = -1;
        }

        if (mcc_channel > 0) {
            col_append_fstr(pinfo->cinfo, COL_INFO, "-> %d ", mcc_channel);
        }

        col_append_str(pinfo->cinfo, COL_INFO, "MPX_CTRL ");

        if(mcc_type){
            col_append_fstr(pinfo->cinfo, COL_INFO, "%s ", val_to_str_const(mcc_type, vs_ctl, "Unknown"));
        }

        offset += length;

        proto_item_set_len(mcc_ti, offset - start_offset);
    }

    /* try to find a higher layer dissector that has registered to handle data
     * for this kind of service, if none is found dissect it as raw "data"
     */
    if (dlci && frame_len) {
        dissector_handle_t  decode_by_dissector;
        tvbuff_t           *next_tvb;
        btrfcomm_data_t    *rfcomm_data;

        next_tvb = tvb_new_subset_length(tvb, offset, frame_len);

        rfcomm_data = (btrfcomm_data_t *) wmem_new(pinfo->pool, btrfcomm_data_t);
        rfcomm_data->interface_id       = l2cap_data->interface_id;
        rfcomm_data->adapter_id         = l2cap_data->adapter_id;
        rfcomm_data->chandle            = l2cap_data->chandle;
        rfcomm_data->cid                = l2cap_data->cid;
        rfcomm_data->is_local_psm       = l2cap_data->is_local_psm;
        rfcomm_data->dlci               = dlci;
        rfcomm_data->remote_bd_addr_oui = l2cap_data->remote_bd_addr_oui;
        rfcomm_data->remote_bd_addr_id  = l2cap_data->remote_bd_addr_id;

        if (service_info && service_info->uuid.size != 0 &&
                p_get_proto_data(pinfo->pool, pinfo, proto_bluetooth, PROTO_DATA_BLUETOOTH_SERVICE_UUID) == NULL) {
            guint8 *value_data;

            value_data = wmem_strdup(wmem_file_scope(), print_numeric_bluetooth_uuid(pinfo->pool, &service_info->uuid));

            p_add_proto_data(pinfo->pool, pinfo, proto_bluetooth, PROTO_DATA_BLUETOOTH_SERVICE_UUID, value_data);
        }

        if (!dissector_try_uint_new(rfcomm_dlci_dissector_table, (guint32) dlci,
                next_tvb, pinfo, tree, TRUE, rfcomm_data)) {
            if (service_info && (service_info->uuid.size == 0 ||
                !dissector_try_string(bluetooth_uuid_table, print_numeric_bluetooth_uuid(pinfo->pool, &service_info->uuid),
                    next_tvb, pinfo, tree, rfcomm_data))) {
                decode_by_dissector = find_proto_by_channel(dlci >> 1);
                if (rfcomm_channels_enabled && decode_by_dissector) {
                    call_dissector_with_data(decode_by_dissector, next_tvb, pinfo, tree, rfcomm_data);
                } else {
                    /* unknown service, let the data dissector handle it */
                    call_data_dissector(next_tvb, pinfo, tree);
                }
            }
        }
    }

    proto_tree_add_item(rfcomm_tree, hf_fcs, tvb, fcs_offset, 1, ENC_LITTLE_ENDIAN);
    offset += 1;

    return offset;
}

static void*
uat_rfcomm_channels_copy_cb(void *dest, const void *source, size_t len _U_)
{
    const uat_rfcomm_channels_t* o = (const uat_rfcomm_channels_t*)source;
    uat_rfcomm_channels_t* d = (uat_rfcomm_channels_t*)dest;

    d->channel = o->channel;
    d->payload_proto = o->payload_proto;
    d->payload_proto_name = g_strdup(o->payload_proto_name);

    return dest;
}

static void
uat_rfcomm_channels_free_cb(void *r)
{
    uat_rfcomm_channels_t *rec = (uat_rfcomm_channels_t *)r;
    g_free(rec->payload_proto_name);
}

void
proto_register_btrfcomm(void)
{
    module_t *module;
    expert_module_t *expert_btrfcomm;

    static hf_register_info hf[] = {
        { &hf_dlci,
          { "DLCI", "btrfcomm.dlci",
            FT_UINT8, BASE_HEX, NULL, 0xFC,
            "RFCOMM Data Link Connection Identifier", HFILL}
        },
        { &hf_channel,
           { "Channel", "btrfcomm.channel",
            FT_UINT8, BASE_DEC, NULL, 0xF8,
            "RFCOMM Channel", HFILL}
        },
        { &hf_direction,
           {"Direction", "btrfcomm.direction",
            FT_UINT8, BASE_HEX, NULL, 0x04,
            NULL, HFILL}
        },
        { &hf_priority,
          { "Priority", "btrfcomm.priority",
            FT_UINT8, BASE_DEC, NULL, 0x3f,
            NULL, HFILL}
        },
        { &hf_max_frame_size,
          { "Max Frame Size", "btrfcomm.max_frame_size",
            FT_UINT16, BASE_DEC, NULL, 0,
            "Maximum Frame Size", HFILL}
        },
        { &hf_max_retrans,
          { "Maximum number of retransmissions", "btrfcomm.max_retrans",
            FT_UINT8, BASE_DEC, NULL, 0,
            NULL, HFILL}
        },
        { &hf_error_recovery_mode,
          { "Error Recovery Mode", "btrfcomm.error_recovery_mode",
            FT_UINT8, BASE_DEC, NULL, 0x07,
            NULL, HFILL}
        },
        { &hf_ea,
          { "EA Flag", "btrfcomm.ea",
            FT_UINT8, BASE_HEX, VALS(vs_ea), 0x01,
            "EA flag (should be always 1)", HFILL}
        },
        { &hf_cr,
          { "C/R Flag", "btrfcomm.cr",
            FT_BOOLEAN, 8, TFS(&tfs_command_response), 0x02,
            "Command/Response flag", HFILL}
        },
        { &hf_mcc,
          { "Multiplexer Control Command", "btrfcomm.mcc",
            FT_NONE, BASE_NONE, NULL, 0x00,
            NULL, HFILL}
        },
        { &hf_mcc_pn_parameters,
          { "Parameters", "btrfcomm.mcc.pn_parameters",
            FT_NONE, BASE_NONE, NULL, 0x00,
            NULL, HFILL}
        },
        { &hf_mcc_types,
          { "Types", "btrfcomm.mcc.types",
            FT_NONE, BASE_NONE, NULL, 0x00,
            NULL, HFILL}
        },
        { &hf_mcc_ea,
          { "EA Flag", "btrfcomm.mcc.ea",
            FT_UINT8, BASE_HEX, VALS(vs_ea), 0x01,
            "RFCOMM MCC EA flag", HFILL}
        },
        { &hf_mcc_cr,
          { "C/R Flag", "btrfcomm.mcc.cr",
            FT_BOOLEAN, 8, TFS(&tfs_command_response), 0x02,
            "Command/Response flag", HFILL}
        },
        { &hf_mcc_const_1,
          { "Ones padding", "btrfcomm.mcc.padding",
            FT_UINT8, BASE_HEX, NULL, 0x02,
            NULL, HFILL}
        },
        { &hf_mcc_dlci,
          { "MCC DLCI", "btrfcomm.mcc.dlci",
            FT_UINT8, BASE_HEX, NULL, 0xFC,
            "RFCOMM MCC Data Link Connection Identifier", HFILL}
        },
        { &hf_mcc_channel,
          { "MCC Channel", "btrfcomm.mcc.channel",
            FT_UINT8, BASE_DEC, NULL, 0xF8,
            "RFCOMM MCC Channel", HFILL}
        },
        { &hf_mcc_direction,
          { "MCC Direction", "btrfcomm.mcc.direction",
            FT_UINT8, BASE_HEX, NULL, 0x04,
            "RFCOMM MCC Direction", HFILL}
        },
        { &hf_mcc_pn_dlci,
          { "MCC DLCI", "btrfcomm.mcc.dlci",
            FT_UINT8, BASE_HEX, NULL, 0x3F,
            "RFCOMM MCC Data Link Connection Identifier", HFILL}
        },
        { &hf_mcc_pn_channel,
          { "MCC Channel", "btrfcomm.mcc.channel",
            FT_UINT8, BASE_DEC, NULL, 0x3E,
            "RFCOMM MCC Channel", HFILL}
        },
        { &hf_mcc_pn_direction,
          { "MCC Direction", "btrfcomm.mcc.direction",
            FT_UINT8, BASE_HEX, NULL, 0x01,
            "RFCOMM MCC Direction", HFILL}
        },
        { &hf_mcc_pn_zeros_padding,
          { "Zeros padding", "btrfcomm.mcc.padding",
            FT_UINT8, BASE_HEX, NULL, 0xC0,
            "RFCOMM MSC Zeros padding", HFILL}
        },
        { &hf_mcc_cmd,
          { "MCC Command Type", "btrfcomm.mcc.cmd",
            FT_UINT8, BASE_HEX, VALS(vs_ctl), 0xFC,
            "Command Type", HFILL}
        },
        { &hf_frame_type,
          { "Frame type", "btrfcomm.frame_type",
            FT_UINT8, BASE_HEX, VALS(vs_frame_type), 0xEF,
            "Command/Response flag", HFILL}
        },
        { &hf_acknowledgement_timer_t1,
          { "Acknowledgement Timer T1", "btrfcomm.acknowledgement_timer_t1",
            FT_UINT8, BASE_DEC, NULL, 0x00,
            NULL, HFILL}
        },
        { &hf_pf,
          { "P/F flag", "btrfcomm.pf",
            FT_UINT8, BASE_HEX, NULL, 0x10,
            "Poll/Final bit", HFILL}
        },
        { &hf_pn_i14,
          { "Type of frame", "btrfcomm.pn.i",
            FT_UINT8, BASE_HEX, VALS(vs_ctl_pn_i), 0x0F,
            "Type of information frames used for that particular DLCI",
            HFILL}
        },
        { &hf_pn_c14,
          { "Convergence layer", "btrfcomm.pn.cl",
            FT_UINT8, BASE_HEX, VALS(vs_ctl_pn_cl), 0xF0,
            "Convergence layer used for that particular DLCI", HFILL}
        },
        { &hf_len,
          { "Payload length", "btrfcomm.len",
            FT_UINT16, BASE_DEC, NULL, 0,
            "Frame length", HFILL}
        },
        { &hf_mcc_len,
          { "MCC Length", "btrfcomm.mcc.len",
            FT_UINT16, BASE_DEC, NULL, 0,
            "Length of MCC data", HFILL}
        },
        { &hf_fcs,
          { "Frame Check Sequence", "btrfcomm.fcs",
            FT_UINT8, BASE_HEX, NULL, 0,
            "Checksum over frame", HFILL}
        },
        { &hf_msc_parameters,
          { "Parameters", "btrfcomm.mcc.msc_parameters",
            FT_NONE, BASE_NONE, NULL, 0x00,
            NULL, HFILL}
        },
        { &hf_msc_fc,
          { "Flow Control (FC)", "btrfcomm.msc.fc",
            FT_UINT8, BASE_HEX, NULL, 0x02,
            "Flow Control", HFILL}
        },
        { &hf_msc_rtc,
          { "Ready To Communicate (RTC)", "btrfcomm.msc.rtc",
            FT_UINT8, BASE_HEX, NULL, 0x04,
            "Ready To Communicate", HFILL}
        },
        { &hf_msc_rtr,
          { "Ready To Receive (RTR)", "btrfcomm.msc.rtr",
            FT_UINT8, BASE_HEX, NULL, 0x08,
            "Ready To Receive", HFILL}
        },
        { &hf_msc_ic,
          { "Incoming Call Indicator (IC)", "btrfcomm.msc.ic",
            FT_UINT8, BASE_HEX, NULL, 0x40,
            "Incoming Call Indicator", HFILL}
        },
        { &hf_msc_dv,
          { "Data Valid (DV)", "btrfcomm.msc.dv",
            FT_UINT8, BASE_HEX, NULL, 0x80,
            "Data Valid", HFILL}
        },
        { &hf_msc_l,
          { "Length of break in units of 200ms", "btrfcomm.msc.bl",
            FT_UINT8, BASE_DEC, NULL, 0xF0,
            NULL, HFILL}
        },
        { &hf_msc_break_bits,
          { "Break Bits", "btrfcomm.msc.break_bits",
            FT_UINT8, BASE_DEC, NULL, 0xE0,
            NULL, HFILL}
        },
        { &hf_address,
          { "Address", "btrfcomm.address",
            FT_NONE, BASE_NONE, NULL, 0x00,
            NULL, HFILL}
        },
        { &hf_control,
          { "Control", "btrfcomm.control",
            FT_NONE, BASE_NONE, NULL, 0x00,
            NULL, HFILL}
        },
        { &hf_fc_credits,
          { "Credits", "btrfcomm.credits",
            FT_UINT8, BASE_DEC, NULL, 0,
            "Flow control: number of UIH frames allowed to send", HFILL}
        }

    };

    /* Setup protocol subtree array */
    static gint *ett[] = {
        &ett_btrfcomm,
        &ett_btrfcomm_ctrl,
        &ett_addr,
        &ett_control,
        &ett_mcc,
        &ett_ctrl_pn_ci,
        &ett_ctrl_pn_v24,
        &ett_dlci,
        &ett_mcc_dlci
    };

    static ei_register_info ei[] = {
        { &ei_btrfcomm_mcc_length_bad, { "btrfcomm.mcc_length_bad", PI_MALFORMED, PI_ERROR, "Huge MCC length", EXPFILL }},
    };

    /* Decode As handling */
    static build_valid_func btrfcomm_directed_channel_da_build_value[1] = {btrfcomm_directed_channel_value};
    static decode_as_value_t btrfcomm_directed_channel_da_values = {btrfcomm_directed_channel_prompt, 1, btrfcomm_directed_channel_da_build_value};
    static decode_as_t btrfcomm_directed_channel_da = {"btrfcomm", "btrfcomm.dlci", 1, 0, &btrfcomm_directed_channel_da_values, NULL, NULL,
                                 decode_as_default_populate_list, decode_as_default_reset, decode_as_default_change, NULL};

    /* Register the protocol name and description */
    proto_btrfcomm = proto_register_protocol("Bluetooth RFCOMM Protocol", "BT RFCOMM", "btrfcomm");
    btrfcomm_handle = register_dissector("btrfcomm", dissect_btrfcomm, proto_btrfcomm);

    /* Required function calls to register the header fields and subtrees used */
    proto_register_field_array(proto_btrfcomm, hf, array_length(hf));
    proto_register_subtree_array(ett, array_length(ett));
    expert_btrfcomm = expert_register_protocol(proto_btrfcomm);
    expert_register_field_array(expert_btrfcomm, ei, array_length(ei));

    service_directions = wmem_tree_new_autoreset(wmem_epan_scope(), wmem_file_scope());

    rfcomm_dlci_dissector_table = register_dissector_table("btrfcomm.dlci", "BT RFCOMM Directed Channel", proto_btrfcomm, FT_UINT16, BASE_DEC);

    module = prefs_register_protocol_subtree("Bluetooth", proto_btrfcomm, NULL);
    prefs_register_static_text_preference(module, "rfcomm.version",
            "Bluetooth Protocol RFCOMM version: 1.1", "Version of protocol supported by this dissector.");

    prefs_register_bool_preference(module, "rfcomm.decode_by.enabled",
            "Enable Force Decode by Channel",
            "Turn on/off decode by next rules",
            &rfcomm_channels_enabled);

    uat_rfcomm_channels = uat_new("Force Decode by Channel",
            sizeof(uat_rfcomm_channels_t),
            "rfcomm_channels",
            TRUE,
            &rfcomm_channels,
            &num_rfcomm_channels,
            UAT_AFFECTS_DISSECTION,
            NULL,
            uat_rfcomm_channels_copy_cb,
            NULL,
            uat_rfcomm_channels_free_cb,
            NULL,
            NULL,
            uat_rfcomm_channels_fields);

    prefs_register_uat_preference(module, "rfcomm.channels",
            "Force Decode by channel",
            "Decode by channel",
            uat_rfcomm_channels);

    register_decode_as(&btrfcomm_directed_channel_da);
}

void
proto_reg_handoff_btrfcomm(void)
{
    dissector_add_uint("btl2cap.psm", BTL2CAP_PSM_RFCOMM, btrfcomm_handle);
    dissector_add_for_decode_as("btl2cap.cid", btrfcomm_handle);
}

/* Bluetooth Dial-Up Networking (DUN) profile dissection */
static gint
dissect_btdun(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
{
    proto_item *ti;
    proto_tree *st;
    gboolean    is_at_cmd;
    guint       i, length;

    length = tvb_captured_length(tvb);

    col_set_str(pinfo->cinfo, COL_PROTOCOL, "DUN");

    ti = proto_tree_add_item(tree, proto_btdun, tvb, 0, tvb_captured_length(tvb), ENC_NA);
    st = proto_item_add_subtree(ti, ett_btdun);

    is_at_cmd = TRUE;
    for(i = 0; i < length && is_at_cmd; i++) {
        is_at_cmd = tvb_get_guint8(tvb, i) < 0x7d;
    }

    if (is_at_cmd) {
        /* presumably an AT command */
        col_add_fstr(pinfo->cinfo, COL_INFO, "%s \"%s\"",
                     (pinfo->p2p_dir == P2P_DIR_SENT) ? "Sent" : "Rcvd",
                     tvb_format_text(pinfo->pool, tvb, 0, length));

           proto_tree_add_item(st, hf_dun_at_cmd, tvb, 0, tvb_reported_length(tvb), ENC_ASCII|ENC_NA);
    }
    else {
        /* ... or raw PPP */
        if (ppp_handle)
            call_dissector(ppp_handle, tvb, pinfo, tree);
        else {
            /* TODO: remove the above 'if' and this 'else-body' when "ppp_raw_hdlc" is available, requires that it is
                made non-anonymous in ppp dissector to use */
            col_set_str(pinfo->cinfo, COL_PROTOCOL, "PPP");
            col_add_fstr(pinfo->cinfo, COL_INFO, "%s <PPP frame>", (pinfo->p2p_dir == P2P_DIR_SENT) ? "Sent" : "Rcvd");

            call_data_dissector(tvb, pinfo, tree);
        }
    }

    return tvb_reported_length(tvb);
}

void
proto_register_btdun(void)
{
    static hf_register_info hf[] = {
        { &hf_dun_at_cmd,
          { "AT Cmd", "btdun.atcmd",
            FT_STRING, BASE_NONE, NULL, 0,
            "AT Command", HFILL}
        },
    };

    /* Setup protocol subtree array */
    static gint *ett[] = {
        &ett_btdun
    };

    proto_btdun = proto_register_protocol("Bluetooth DUN Packet", "BT DUN", "btdun");
    btdun_handle = register_dissector("btdun", dissect_btdun, proto_btdun);

    /* Required function calls to register the header fields and subtrees used */
    proto_register_field_array(proto_btdun, hf, array_length(hf));
    proto_register_subtree_array(ett, array_length(ett));
}

void
proto_reg_handoff_btdun(void)
{
    dissector_add_string("bluetooth.uuid",  "1103", btdun_handle);

    dissector_add_for_decode_as("btrfcomm.dlci", btdun_handle);

    ppp_handle = find_dissector_add_dependency("ppp_raw_hdlc", proto_btdun);
}

/* Bluetooth Serial Port profile (SPP) dissection */
static gint
dissect_btspp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
{
    proto_item *ti;
    proto_tree *st;
    gboolean    ascii_only;
    guint       i;
    guint       length = tvb_captured_length(tvb);

    col_set_str(pinfo->cinfo, COL_PROTOCOL, "SPP");

    ti = proto_tree_add_item(tree, proto_btspp, tvb, 0, tvb_captured_length(tvb), ENC_NA);
    st = proto_item_add_subtree(ti, ett_btspp);

    length = MIN(length, 60);
    ascii_only = TRUE;
    for(i = 0; i < length && ascii_only; i++) {
        ascii_only = tvb_get_guint8(tvb, i) < 0x80;
    }

    if (ascii_only) {
        col_add_fstr(pinfo->cinfo, COL_INFO, "%s \"%s%s\"",
                     (pinfo->p2p_dir == P2P_DIR_SENT) ? "Sent" : "Rcvd",
                     tvb_format_text(pinfo->pool, tvb, 0, length),
                     (tvb_captured_length(tvb) > length) ? "..." : "");
    }

    proto_tree_add_item(st, hf_spp_data, tvb, 0, tvb_reported_length(tvb), ENC_NA);

    return tvb_reported_length(tvb);
}

void
proto_register_btspp(void)
{
    static hf_register_info hf[] = {
        { &hf_spp_data,
          { "Data", "btspp.data",
            FT_BYTES, BASE_NONE, NULL, 0,
            NULL, HFILL }
        },
    };

    /* Setup protocol subtree array */
    static gint *ett[] = {
        &ett_btspp
    };

    proto_btspp = proto_register_protocol("Bluetooth SPP Packet", "BT SPP", "btspp");
    btspp_handle = register_dissector("btspp", dissect_btspp, proto_btspp);

    /* Required function calls to register the header fields and subtrees used */
    proto_register_field_array(proto_btspp, hf, array_length(hf));
    proto_register_subtree_array(ett, array_length(ett));
}

void
proto_reg_handoff_btspp(void)
{
    dissector_add_string("bluetooth.uuid",  "1101", btspp_handle);

    dissector_add_for_decode_as("btrfcomm.dlci", btspp_handle);
}


/* Bluetooth Global Navigation Satellite System profile (GNSS) dissection */
static gint
dissect_btgnss(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
{
    proto_item *main_item;
    proto_tree *main_tree;

    col_set_str(pinfo->cinfo, COL_PROTOCOL, "GNSS");

    main_item = proto_tree_add_item(tree, proto_btgnss, tvb, 0, tvb_captured_length(tvb), ENC_NA);
    main_tree = proto_item_add_subtree(main_item, ett_btgnss);

    col_add_fstr(pinfo->cinfo, COL_INFO, "%s %s",
            (pinfo->p2p_dir == P2P_DIR_SENT) ? "Sent" : "Rcvd",
            tvb_format_text(pinfo->pool, tvb, 0, tvb_captured_length(tvb)));

    /* GNSS using NMEA-0183 protocol, but it is not available */
    proto_tree_add_item(main_tree, hf_gnss_data, tvb, 0, tvb_reported_length(tvb), ENC_NA | ENC_ASCII);

    return tvb_reported_length(tvb);
}

void
proto_register_btgnss(void)
{
    static hf_register_info hf[] = {
        { &hf_gnss_data,
        { "Data", "btgnss.data",
            FT_STRING, BASE_NONE, NULL, 0,
            NULL, HFILL }
        },
    };

    static gint *ett[] = {
        &ett_btgnss
    };

    proto_btgnss = proto_register_protocol("Bluetooth GNSS Profile", "BT GNSS", "btgnss");
    btgnss_handle = register_dissector("btgnss", dissect_btgnss, proto_btgnss);

    proto_register_field_array(proto_btgnss, hf, array_length(hf));
    proto_register_subtree_array(ett, array_length(ett));
}

void
proto_reg_handoff_btgnss(void)
{
    dissector_add_string("bluetooth.uuid",  "1135", btgnss_handle);
    dissector_add_string("bluetooth.uuid",  "1136", btgnss_handle);

    dissector_add_for_decode_as("btrfcomm.dlci", btgnss_handle);
}

/*
 * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
 *
 * Local variables:
 * c-basic-offset: 4
 * tab-width: 8
 * indent-tabs-mode: nil
 * End:
 *
 * vi: set shiftwidth=4 tabstop=8 expandtab:
 * :indentSize=4:tabSize=8:noTabs=true:
 */