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
|
/* packet-kdp.c
* Routines for KDP (Kontiki Delivery Protocol) packet disassembly
*
* Copyright (c) 2008 by Kontiki Inc.
* Wade Hennessey <wade@kontiki.com>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1999 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "config.h"
#include <epan/packet.h>
void proto_register_kdp(void);
void proto_reg_handoff_kdp(void);
static dissector_handle_t kdp_handle;
#define KDP_PORT 19948 /* Not IANA registered */
#define BUFFER_SIZE 80
static int proto_kdp = -1;
static gint ett_kdp = -1;
static gint ett_kdp_flags = -1;
static int hf_kdp_version = -1;
static int hf_kdp_headerlen = -1;
static int hf_kdp_flags = -1;
static int hf_kdp_errors = -1;
static int hf_kdp_destflowid = -1;
static int hf_kdp_srcflowid = -1;
static int hf_kdp_sequence = -1;
static int hf_kdp_ack = -1;
static int hf_kdp_maxsegmentsize = -1;
static int hf_kdp_optionnumber = -1;
static int hf_kdp_optionlen = -1;
static int hf_kdp_option1 = -1;
static int hf_kdp_option2 = -1;
static int hf_kdp_option3 = -1;
static int hf_kdp_option4 = -1;
static int hf_kdp_option5 = -1;
static int hf_kdp_option6 = -1;
static int hf_kdp_option7 = -1;
static int hf_kdp_option8 = -1;
static int hf_kdp_option9 = -1;
static int hf_kdp_option_unknown = -1;
static int hf_kdp_fragment = -1;
static int hf_kdp_fragtotal = -1;
static int hf_kdp_body = -1;
static int hf_kdp_xml_body = -1;
#define KDP_DROP_FLAG (1 << 0)
#define KDP_SYN_FLAG (1 << 1)
#define KDP_ACK_FLAG (1 << 2)
#define KDP_RST_FLAG (1 << 3)
#define KDP_BCST_FLAG (1 << 4)
#define KDP_DUP_FLAG (1 << 5)
static int hf_kdp_drop_flag = -1;
static int hf_kdp_syn_flag = -1;
static int hf_kdp_ack_flag = -1;
static int hf_kdp_rst_flag = -1;
static int hf_kdp_bcst_flag = -1;
static int hf_kdp_dup_flag = -1;
static int dissect_kdp(tvbuff_t *tvb,
packet_info *pinfo,
proto_tree *tree, void* data _U_) {
proto_item *ti;
proto_tree *kdp_tree;
guint body_len;
guint8 version;
guint8 header_len = 0;
guint8 packet_flags = 0;
guint8 packet_errors = 0;
guint32 sequence_number = G_MAXUINT32;
guint32 ack_number = G_MAXUINT32;
guint32 src_flowid = G_MAXUINT32;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "KDP");
col_clear(pinfo->cinfo, COL_INFO);
ti = proto_tree_add_item(tree, proto_kdp, tvb, 0, -1, ENC_NA);
kdp_tree = proto_item_add_subtree(ti, ett_kdp);
version = tvb_get_guint8(tvb, 0);
if (version != 2) {
/* Version other than 2 is really SDDP in UDP */
proto_tree_add_item(kdp_tree, hf_kdp_version, tvb, 0, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(kdp_tree, hf_kdp_xml_body, tvb, 0, -1, ENC_ASCII);
} else {
proto_tree *flags_tree;
header_len = tvb_get_guint8(tvb, 1) * 4;
body_len = tvb_reported_length(tvb);
if (header_len > body_len) {
body_len = 0; /* malformed packet */
} else {
body_len = body_len - header_len;
}
packet_flags = tvb_get_guint8(tvb, 2);
packet_errors = tvb_get_guint8(tvb, 3);
proto_tree_add_item(kdp_tree, hf_kdp_version, tvb, 0, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(kdp_tree, hf_kdp_headerlen, tvb, 1, 1, ENC_BIG_ENDIAN);
ti = proto_tree_add_item(kdp_tree, hf_kdp_flags, tvb, 2, 1, ENC_BIG_ENDIAN);
flags_tree = proto_item_add_subtree(ti, ett_kdp_flags);
proto_tree_add_item(flags_tree, hf_kdp_drop_flag, tvb, 2, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(flags_tree, hf_kdp_syn_flag, tvb, 2, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(flags_tree, hf_kdp_ack_flag, tvb, 2, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(flags_tree, hf_kdp_rst_flag, tvb, 2, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(flags_tree, hf_kdp_bcst_flag, tvb, 2, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(flags_tree, hf_kdp_dup_flag, tvb, 2, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(kdp_tree, hf_kdp_errors, tvb, 3, 1, ENC_BIG_ENDIAN);
if (header_len > 4) {
int offset;
offset = 4;
if (packet_flags & KDP_ACK_FLAG) {
proto_tree_add_item(kdp_tree, hf_kdp_destflowid, tvb, offset, 4, ENC_BIG_ENDIAN);
offset = offset + 4;
}
if (packet_flags & (KDP_SYN_FLAG | KDP_BCST_FLAG)) {
proto_tree_add_item(kdp_tree, hf_kdp_srcflowid, tvb, offset, 4, ENC_BIG_ENDIAN);
src_flowid = tvb_get_ntohl(tvb, offset);
offset = offset + 4;
}
proto_tree_add_item(kdp_tree, hf_kdp_sequence, tvb, offset, 4, ENC_BIG_ENDIAN);
sequence_number = tvb_get_ntohl(tvb, offset);
offset = offset + 4;
if (packet_flags & KDP_ACK_FLAG) {
proto_tree_add_item(kdp_tree, hf_kdp_ack, tvb, offset, 4, ENC_BIG_ENDIAN);
ack_number = tvb_get_ntohl(tvb, offset);
offset = offset + 4;
}
if (packet_flags & KDP_SYN_FLAG) {
proto_tree_add_item(kdp_tree, hf_kdp_maxsegmentsize, tvb, offset, 4, ENC_BIG_ENDIAN);
offset = offset + 4;
}
while (offset < ((body_len > 0) ? header_len - 4 : header_len)) {
guint8 option_number;
guint8 option_len = 0;
option_number = tvb_get_guint8(tvb, offset);
proto_tree_add_item(kdp_tree, hf_kdp_optionnumber, tvb, offset, 1, ENC_BIG_ENDIAN);
offset = offset + 1;
if (option_number > 0) {
option_len = tvb_get_guint8(tvb, offset);
proto_tree_add_item(kdp_tree, hf_kdp_optionlen, tvb, offset, 1, ENC_BIG_ENDIAN);
offset = offset + 1;
}
switch (option_number) {
case 0:
break;
case 1:
proto_tree_add_item(kdp_tree, hf_kdp_option1, tvb, offset, 2, ENC_BIG_ENDIAN);
offset = offset + 2;
break;
case 2:
proto_tree_add_item(kdp_tree, hf_kdp_option2, tvb, offset, 2, ENC_BIG_ENDIAN);
offset = offset + 2;
break;
case 3:
proto_tree_add_item(kdp_tree, hf_kdp_option3, tvb, offset, 2, ENC_BIG_ENDIAN);
offset = offset + 2;
break;
case 4:
proto_tree_add_item(kdp_tree, hf_kdp_option4, tvb, offset, 0, ENC_NA);
break;
case 5:
proto_tree_add_item(kdp_tree, hf_kdp_option5, tvb, offset, 0, ENC_NA);
break;
case 6:
proto_tree_add_item(kdp_tree, hf_kdp_option6, tvb, offset, option_len - 2, ENC_NA);
offset = offset + option_len - 2;
break;
case 7:
proto_tree_add_item(kdp_tree, hf_kdp_option7, tvb, offset, 2, ENC_BIG_ENDIAN);
offset = offset + 2;
break;
case 8:
proto_tree_add_item(kdp_tree, hf_kdp_option8, tvb, offset, 2, ENC_BIG_ENDIAN);
offset = offset + 2;
break;
case 9:
proto_tree_add_item(kdp_tree, hf_kdp_option9, tvb, offset, 2, ENC_BIG_ENDIAN);
offset = offset + 2;
break;
default:
proto_tree_add_item(kdp_tree, hf_kdp_option_unknown, tvb, offset, option_len - 2, ENC_NA);
offset = offset + option_len - 2;
break;
}
}
if (body_len > 0) {
proto_tree_add_item(kdp_tree, hf_kdp_fragment, tvb, offset, 2, ENC_BIG_ENDIAN);
offset = offset + 2;
proto_tree_add_item(kdp_tree, hf_kdp_fragtotal, tvb, offset, 2, ENC_BIG_ENDIAN);
offset = offset + 2;
proto_tree_add_item(kdp_tree, hf_kdp_body, tvb, offset, -1, ENC_NA);
}
}
}
/* Now that we know sequence number and optional ack number, we can
print more detailed summary info */
if (version != 2) {
col_set_str(pinfo->cinfo, COL_INFO, "SDDP message");
} else {
char ack_string[BUFFER_SIZE];
char seq_num_string[BUFFER_SIZE];
char src_flowid_string[BUFFER_SIZE];
if (packet_flags & KDP_ACK_FLAG) {
snprintf(ack_string, sizeof(ack_string), "ACK=%x ", ack_number);
} else {
ack_string[0] = '\0';
}
if (header_len > 4) {
snprintf(seq_num_string, sizeof(seq_num_string), "SEQ=%x ", sequence_number);
} else {
seq_num_string[0] = '\0';
}
if (packet_flags & (KDP_SYN_FLAG | KDP_BCST_FLAG)) {
snprintf(src_flowid_string, sizeof(src_flowid_string), "SRC_FLOWID=%x ", src_flowid);
} else {
src_flowid_string[0] = '\0';
}
col_add_fstr(pinfo->cinfo, COL_INFO, "%s%s%s%s%s%s%s%serrors=%d",
((packet_flags & KDP_DROP_FLAG) ? "DROP " : ""),
((packet_flags & KDP_SYN_FLAG) ? "SYN " : ""),
((packet_flags & KDP_RST_FLAG) ? "RST " : ""),
((packet_flags & KDP_BCST_FLAG) ? "BCST " : ""),
((packet_flags & KDP_DUP_FLAG) ? "DUP " : ""),
ack_string,
seq_num_string,
src_flowid_string,
packet_errors);
}
return tvb_captured_length(tvb);
}
void proto_register_kdp(void) {
static hf_register_info hf[] = {
{ &hf_kdp_version,
{"KDP version", "kdp.version",
FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL}
},
{ &hf_kdp_headerlen,
{"KDP header len", "kdp.headerlen",
FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL}
},
{ &hf_kdp_flags,
{"KDP flags", "kdp.flags",
FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL}
},
{ &hf_kdp_drop_flag,
{"KDP DROP Flag", "kdp.flags.drop",
FT_BOOLEAN, 8, NULL, KDP_DROP_FLAG, NULL, HFILL}
},
{ &hf_kdp_syn_flag,
{"KDP SYN Flag", "kdp.flags.syn",
FT_BOOLEAN, 8, NULL, KDP_SYN_FLAG, NULL, HFILL}
},
{ &hf_kdp_ack_flag,
{"KDP ACK Flag", "kdp.flags.ack",
FT_BOOLEAN, 8, NULL, KDP_ACK_FLAG, NULL, HFILL}
},
{ &hf_kdp_rst_flag,
{"KDP RST Flag", "kdp.flags.rst",
FT_BOOLEAN, 8, NULL, KDP_RST_FLAG, NULL, HFILL}
},
{ &hf_kdp_bcst_flag,
{"KDP BCST Flag", "kdp.flags.bcst",
FT_BOOLEAN, 8, NULL, KDP_BCST_FLAG, NULL, HFILL}
},
{ &hf_kdp_dup_flag,
{"KDP DUP Flag", "kdp.flags.dup",
FT_BOOLEAN, 8, NULL, KDP_DUP_FLAG, NULL, HFILL}
},
{ &hf_kdp_errors,
{"KDP errors", "kdp.errors",
FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL}
},
{ &hf_kdp_destflowid,
{ "DestFlowID", "kdp.destflowid",
FT_UINT32, BASE_HEX, NULL, 0x0, NULL, HFILL}
},
{ &hf_kdp_srcflowid,
{ "SrcFlowID", "kdp.srcflowid",
FT_UINT32, BASE_HEX, NULL, 0x0, NULL, HFILL}
},
{ &hf_kdp_sequence,
{ "Sequence", "kdp.sequence",
FT_UINT32, BASE_HEX, NULL, 0x0, NULL, HFILL}
},
{ &hf_kdp_ack,
{ "Ack", "kdp.ack",
FT_UINT32, BASE_HEX, NULL, 0x0, NULL, HFILL}
},
{ &hf_kdp_maxsegmentsize,
{ "MaxSegmentSize", "kdp.maxsegmentsize",
FT_UINT32, BASE_HEX, NULL, 0x0, NULL, HFILL}
},
{ &hf_kdp_optionnumber,
{ "Option Number", "kdp.optionnumber",
FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL}
},
{ &hf_kdp_optionlen,
{ "Option Len", "kdp.option",
FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL}
},
{ &hf_kdp_option1,
{ "Option1 - Max Window", "kdp.option1",
FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL}
},
{ &hf_kdp_option2,
{ "Option2 - TCP Fraction", "kdp.option2",
FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL}
},
{ &hf_kdp_option3,
{ "Option3 - KDP Version", "kdp.option3",
FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL}
},
{ &hf_kdp_option4,
{ "Option4 - Enable Reliable", "kdp.option4",
FT_NONE, BASE_NONE, NULL, 0x0, NULL, HFILL}
},
{ &hf_kdp_option5,
{ "Option5 - Disable Reliable", "kdp.option5",
FT_NONE, BASE_NONE, NULL, 0x0, NULL, HFILL}
},
{ &hf_kdp_option6,
{ "Option6 - SACK", "kdp.option6",
FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL}
},
{ &hf_kdp_option7,
{ "Option7 - COS", "kdp.option7",
FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL}
},
{ &hf_kdp_option8,
{ "Option8 - BWMIN", "kdp.option8",
FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL}
},
{ &hf_kdp_option9,
{ "Option9 - INT", "kdp.option9",
FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL}
},
{ &hf_kdp_option_unknown,
{ "Unknown option", "kdp.option_unknown",
FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL}
},
{ &hf_kdp_fragment,
{ "Fragment", "kdp.fragment",
FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL}
},
{ &hf_kdp_fragtotal,
{ "FragTotal", "kdp.fragtotal",
FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL}
},
{ &hf_kdp_body,
{ "Encrypted Body", "kdp.body",
FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL}
},
{ &hf_kdp_xml_body,
{ "XML Body", "kdp.xml_body",
FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL}
}
};
/* Setup protocol subtree array */
static gint *ett[] = {
&ett_kdp, &ett_kdp_flags
};
proto_kdp = proto_register_protocol("Kontiki Delivery Protocol", /* name */
"KDP", /* short name */
"kdp"); /* abbrev */
proto_register_field_array(proto_kdp, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
kdp_handle = register_dissector("kdp", dissect_kdp, proto_kdp);
}
void
proto_reg_handoff_kdp(void) {
dissector_add_uint_with_preference("udp.port", KDP_PORT, kdp_handle);
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local Variables:
* c-basic-offset: 2
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* ex: set shiftwidth=2 tabstop=8 expandtab:
* :indentSize=2:tabSize=8:noTabs=true:
*/
|
