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
|
/* decoders.c
* Routines for the TRANSUM response time analyzer post-dissector
* By Paul Offord <paul.offord@advance7.com>
* Copyright 2016 Advance Seven Limited
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include <stdio.h>
#include <epan/packet.h>
#include <epan/prefs.h>
#include <epan/dissectors/packet-tcp.h>
#include "packet-transum.h"
#include "preferences.h"
#include "extractors.h"
#include "decoders.h"
extern TSUM_PREFERENCES preferences;
/* Returns the number of sub-packets of interest */
int decode_syn(packet_info *pinfo _U_, proto_tree *tree _U_, PKT_INFO* pkt_info)
{
if (pkt_info->tcp_flags_ack)
pkt_info->rrpd.c2s = FALSE;
else
{
pkt_info->rrpd.c2s = TRUE;
pkt_info->rrpd.state = RRPD_STATE_4;
add_detected_tcp_svc(pkt_info->dstport);
}
pkt_info->rrpd.session_id = 1;
pkt_info->rrpd.msg_id = 1;
pkt_info->rrpd.suffix = 1;
pkt_info->rrpd.decode_based = TRUE;
pkt_info->rrpd.calculation = RTE_CALC_SYN;
pkt_info->pkt_of_interest = TRUE;
return 1;
}
/*
This function sets basic information in the sub_packet entry.
Because we don't expect multiple DCE-RPC messages in a single packet
we only use single PKT_INFO
Returns the number of sub-packets of interest, which in this case is always 1.
*/
int decode_dcerpc(packet_info *pinfo _U_, proto_tree *tree, PKT_INFO* pkt_info)
{
guint32 field_uint[MAX_RETURNED_ELEMENTS]; /* An extracted field array for unsigned integers */
size_t field_value_count; /* How many entries are there in the extracted field array */
guint32 dcerpc_cn_ctx_id = 0;
if (!extract_uint(tree, hf_of_interest[HF_INTEREST_DCERPC_VER].hf, field_uint, &field_value_count))
{
if (field_value_count)
pkt_info->dcerpc_ver = field_uint[0];
}
if (!extract_uint(tree, hf_of_interest[HF_INTEREST_DCERPC_PKT_TYPE].hf, field_uint, &field_value_count))
{
if (field_value_count)
pkt_info->dcerpc_pkt_type = field_uint[0];
}
if (field_value_count)
{
if (!extract_uint(tree, hf_of_interest[HF_INTEREST_DCERPC_CN_CTX_ID].hf, field_uint, &field_value_count))
{
if (field_value_count)
dcerpc_cn_ctx_id = field_uint[0];
}
if (is_dcerpc_context_zero(pkt_info->dcerpc_pkt_type))
{ /* This is needed to overcome an apparent Wireshark bug
found in the LUA code - is this still true in C? */
pkt_info->rrpd.session_id = 1;
}
else
{
if (dcerpc_cn_ctx_id)
pkt_info->rrpd.session_id = dcerpc_cn_ctx_id;
else
pkt_info->rrpd.session_id = 1;
}
if (!extract_uint(tree, hf_of_interest[HF_INTEREST_DCERPC_CN_CALL_ID].hf, field_uint, &field_value_count))
{
if (field_value_count)
pkt_info->rrpd.msg_id = field_uint[0];
}
}
else
{
/*
we don't have header information and so by setting the session_id and msg_id to zero
the rrpd functions will either create a new rrpd_list (or temp_rsp_rrpd_list) entry
or update the last entry for this ip_proto:stream_no.
*/
pkt_info->rrpd.session_id = 0;
pkt_info->rrpd.msg_id = 0;
}
if (is_dcerpc_req_pkt_type(pkt_info->dcerpc_pkt_type))
{
pkt_info->rrpd.c2s = TRUE;
wmem_map_insert(preferences.tcp_svc_ports, GUINT_TO_POINTER(pkt_info->dstport), GUINT_TO_POINTER(RTE_CALC_DCERPC)); /* make sure we have this DCE-RPC service port set */
}
else
{
pkt_info->rrpd.c2s = FALSE;
wmem_map_insert(preferences.tcp_svc_ports, GUINT_TO_POINTER(pkt_info->srcport), GUINT_TO_POINTER(RTE_CALC_DCERPC)); /* make sure we have this DCE-RPC service port set */
}
pkt_info->rrpd.suffix = 1;
pkt_info->rrpd.decode_based = TRUE;
pkt_info->rrpd.calculation = RTE_CALC_DCERPC;
pkt_info->pkt_of_interest = TRUE;
return 1;
}
/* Returns the number of sub-packets of interest */
int decode_smb(packet_info *pinfo _U_, proto_tree *tree, PKT_INFO* pkt_info, PKT_INFO* subpackets)
{
guint32 field_uint[MAX_RETURNED_ELEMENTS]; /* An extracted field array for unsigned integers */
size_t field_value_count; /* How many entries are there in the extracted field array */
guint64 ses_id[MAX_RETURNED_ELEMENTS];
size_t ses_id_count;
guint64 msg_id[MAX_RETURNED_ELEMENTS];
size_t msg_id_count;
/* set the direction information */
if (pkt_info->dstport == 445)
pkt_info->rrpd.c2s = TRUE;
else
pkt_info->rrpd.c2s = FALSE;
if (!extract_uint(tree, hf_of_interest[HF_INTEREST_SMB_MID].hf, field_uint, &field_value_count))
{
if (field_value_count)
{
pkt_info->rrpd.calculation = RTE_CALC_SMB1;
pkt_info->pkt_of_interest = FALSE; /* can't process SMB1 at the moment */
return 0;
}
}
/* Default in case we don't have header information */
pkt_info->rrpd.session_id = 0;
pkt_info->rrpd.msg_id = 0;
pkt_info->rrpd.suffix = 1;
pkt_info->rrpd.decode_based = TRUE;
pkt_info->rrpd.calculation = RTE_CALC_SMB2;
pkt_info->pkt_of_interest = TRUE;
extract_ui64(tree, hf_of_interest[HF_INTEREST_SMB2_MSG_ID].hf, msg_id, &msg_id_count);
if (msg_id_count) /* test for header information */
{
extract_ui64(tree, hf_of_interest[HF_INTEREST_SMB2_SES_ID].hf, ses_id, &ses_id_count);
for (size_t i = 0; (i < msg_id_count) && (i < MAX_SUBPKTS_PER_PACKET); i++)
{
subpackets[i].rrpd.c2s = pkt_info->rrpd.c2s;
subpackets[i].rrpd.ip_proto = pkt_info->rrpd.ip_proto;
subpackets[i].rrpd.stream_no = pkt_info->rrpd.stream_no;
subpackets[i].rrpd.session_id = ses_id[i];
subpackets[i].rrpd.msg_id = msg_id[i];
subpackets[i].rrpd.suffix = 1;
subpackets[i].rrpd.decode_based = TRUE;
subpackets[i].rrpd.calculation = RTE_CALC_SMB2;
subpackets[i].pkt_of_interest = TRUE;
}
return (int)msg_id_count;
}
return 1;
}
/* Returns the number of sub-packets of interest */
int decode_gtcp(packet_info *pinfo, proto_tree *tree, PKT_INFO* pkt_info)
{
guint32 field_uint[MAX_RETURNED_ELEMENTS]; /* An extracted field array for unsigned integers */
gboolean field_bool[MAX_RETURNED_ELEMENTS]; /* An extracted field array for unsigned integers */
size_t field_value_count; /* How many entries are there in the extracted field array */
if (!extract_uint(tree, hf_of_interest[HF_INTEREST_TCP_STREAM].hf, field_uint, &field_value_count)) {
if (field_value_count)
pkt_info->rrpd.stream_no = field_uint[0];
}
pkt_info->srcport = pinfo->srcport;
pkt_info->dstport = pinfo->destport;
if (!extract_uint(tree, hf_of_interest[HF_INTEREST_TCP_LEN].hf, field_uint, &field_value_count)) {
if (field_value_count)
pkt_info->len = field_uint[0];
}
if (!extract_bool(tree, hf_of_interest[HF_INTEREST_TCP_FLAGS_SYN].hf, field_bool, &field_value_count)) {
if (field_value_count)
pkt_info->tcp_flags_syn = field_bool[0];
}
if (!extract_bool(tree, hf_of_interest[HF_INTEREST_TCP_FLAGS_ACK].hf, field_bool, &field_value_count)) {
if (field_value_count)
pkt_info->tcp_flags_ack = field_bool[0];
}
if (!extract_bool(tree, hf_of_interest[HF_INTEREST_TCP_FLAGS_RESET].hf, field_bool, &field_value_count)) {
if (field_value_count)
pkt_info->tcp_flags_reset = field_bool[0];
}
if (!extract_bool(tree, hf_of_interest[HF_INTEREST_TCP_RETRAN].hf, field_bool, &field_value_count)) {
if (field_value_count)
pkt_info->tcp_retran = field_bool[0];
}
if (!extract_bool(tree, hf_of_interest[HF_INTEREST_TCP_KEEP_ALIVE].hf, field_bool, &field_value_count)) {
if (field_value_count)
pkt_info->tcp_keep_alive = field_bool[0];
}
if (((wmem_map_lookup(preferences.tcp_svc_ports, GUINT_TO_POINTER(pkt_info->dstport)) != NULL) ||
(wmem_map_lookup(preferences.tcp_svc_ports, GUINT_TO_POINTER(pkt_info->srcport)) != NULL)) &&
(pkt_info->len > 0))
{
if (wmem_map_lookup(preferences.tcp_svc_ports, GUINT_TO_POINTER(pkt_info->dstport)) != NULL)
pkt_info->rrpd.c2s = TRUE;
pkt_info->rrpd.session_id = 1;
pkt_info->rrpd.msg_id = 1;
pkt_info->rrpd.calculation = RTE_CALC_GTCP;
pkt_info->rrpd.decode_based = FALSE;
pkt_info->pkt_of_interest = TRUE;
return 1;
}
return 0;
}
/* Returns the number of sub-packets of interest */
int decode_dns(packet_info *pinfo _U_, proto_tree *tree, PKT_INFO* pkt_info)
{
guint32 field_uint[MAX_RETURNED_ELEMENTS]; /* An extracted field array for unsigned integers */
size_t field_value_count; /* How many entries are there in the extracted field array */
if (!extract_uint(tree, hf_of_interest[HF_INTEREST_DNS_ID].hf, field_uint, &field_value_count)) {
if (field_value_count)
pkt_info->rrpd.msg_id = field_uint[0];
}
pkt_info->rrpd.session_id = 1;
pkt_info->rrpd.suffix = 1; /* need to do something tricky here as dns.id gets reused */
pkt_info->rrpd.decode_based = TRUE;
pkt_info->rrpd.calculation = RTE_CALC_DNS;
pkt_info->pkt_of_interest = TRUE;
return 1;
}
/* Returns the number of sub-packets of interest */
int decode_gudp(packet_info *pinfo, proto_tree *tree, PKT_INFO* pkt_info)
{
guint32 field_uint[MAX_RETURNED_ELEMENTS]; /* An extracted field array for unsigned integers */
size_t field_value_count; /* How many entries are there in the extracted field array */
pkt_info->srcport = pinfo->srcport;
pkt_info->dstport = pinfo->destport;
if (!extract_uint(tree, hf_of_interest[HF_INTEREST_UDP_STREAM].hf, field_uint, &field_value_count)) {
if (field_value_count)
pkt_info->rrpd.stream_no = field_uint[0];
}
if (!extract_uint(tree, hf_of_interest[HF_INTEREST_UDP_LENGTH].hf, field_uint, &field_value_count)) {
if (field_value_count)
pkt_info->len = field_uint[0];
}
if ((wmem_map_lookup(preferences.udp_svc_ports, GUINT_TO_POINTER(pkt_info->dstport)) != NULL) ||
(wmem_map_lookup(preferences.udp_svc_ports, GUINT_TO_POINTER(pkt_info->srcport)) != NULL))
{
if (wmem_map_lookup(preferences.udp_svc_ports, GUINT_TO_POINTER(pkt_info->dstport)) != NULL)
pkt_info->rrpd.c2s = TRUE;
pkt_info->rrpd.session_id = 1;
pkt_info->rrpd.msg_id = 1;
pkt_info->rrpd.suffix = 1;
pkt_info->rrpd.decode_based = FALSE;
pkt_info->rrpd.calculation = RTE_CALC_GUDP;
pkt_info->pkt_of_interest = TRUE;
}
return 1;
}
/*
* Editor modelines - http://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:
*/
|
