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
|
/* packet-pres.c
* Routine to dissect ISO 8823 OSI Presentation Protocol packets
* Based on the dissector by
* Yuriy Sidelnikov <YSidelnikov@hotmail.com>
*
* $Id$
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@ethereal.com>
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <glib.h>
#include <epan/packet.h>
#include <epan/conversation.h>
#include <epan/emem.h>
#include <stdio.h>
#include <string.h>
#include "packet-ber.h"
#include "packet-ses.h"
#include "packet-pres.h"
#include "packet-rtse.h"
#define PNAME "ISO 8823 OSI Presentation Protocol"
#define PSNAME "PRES"
#define PFNAME "pres"
/* Initialize the protocol and registered fields */
int proto_pres = -1;
/* type of session envelop */
static struct SESSION_DATA_STRUCTURE* session = NULL;
/* pointers for acse dissector */
proto_tree *global_tree = NULL;
packet_info *global_pinfo = NULL;
/* dissector for data */
static dissector_handle_t data_handle;
static const char *abstract_syntax_name_oid;
static guint32 presentation_context_identifier;
/* to keep track of presentation context identifiers and protocol-oids */
typedef struct _pres_ctx_oid_t {
/* XXX here we should keep track of conversation as well */
guint32 ctx_id;
char *oid;
} pres_ctx_oid_t;
static GHashTable *pres_ctx_oid_table = NULL;
static int hf_pres_CP_type = -1;
static int hf_pres_CPA_PPDU = -1;
static int hf_pres_Abort_type = -1;
static int hf_pres_CPR_PPDU = -1;
static int hf_pres_Typed_data_type = -1;
#include "packet-pres-hf.c"
/* Initialize the subtree pointers */
static gint ett_pres = -1;
#include "packet-pres-ett.c"
static guint
pres_ctx_oid_hash(gconstpointer k)
{
pres_ctx_oid_t *pco=(pres_ctx_oid_t *)k;
return pco->ctx_id;
}
/* XXX this one should be made ADDRESS/PORT aware */
static gint
pres_ctx_oid_equal(gconstpointer k1, gconstpointer k2)
{
pres_ctx_oid_t *pco1=(pres_ctx_oid_t *)k1;
pres_ctx_oid_t *pco2=(pres_ctx_oid_t *)k2;
return pco1->ctx_id==pco2->ctx_id;
}
static void
pres_init(void)
{
if( pres_ctx_oid_table ){
g_hash_table_destroy(pres_ctx_oid_table);
pres_ctx_oid_table = NULL;
}
pres_ctx_oid_table = g_hash_table_new(pres_ctx_oid_hash,
pres_ctx_oid_equal);
}
static void
register_ctx_id_and_oid(packet_info *pinfo _U_, guint32 idx, const char *oid)
{
pres_ctx_oid_t *pco, *tmppco;
pco=se_alloc(sizeof(pres_ctx_oid_t));
pco->ctx_id=idx;
if(!oid){
/* we did not get any oid name, malformed packet? */
pco->oid=NULL;
return;
}
pco->oid=se_strdup(oid);
/* if this ctx already exists, remove the old one first */
tmppco=(pres_ctx_oid_t *)g_hash_table_lookup(pres_ctx_oid_table, pco);
if(tmppco){
g_hash_table_remove(pres_ctx_oid_table, tmppco);
}
g_hash_table_insert(pres_ctx_oid_table, pco, pco);
}
char *
find_oid_by_pres_ctx_id(packet_info *pinfo _U_, guint32 idx)
{
pres_ctx_oid_t pco, *tmppco;
pco.ctx_id=idx;
tmppco=(pres_ctx_oid_t *)g_hash_table_lookup(pres_ctx_oid_table, &pco);
if(tmppco){
return tmppco->oid;
}
return NULL;
}
#include "packet-pres-fn.c"
/*
* Dissect an PPDU.
*/
static int
dissect_ppdu(tvbuff_t *tvb, int offset, packet_info *pinfo, proto_tree *tree)
{
proto_item *ti;
proto_tree *pres_tree = NULL;
guint s_type;
/* do we have spdu type from the session dissector? */
if( !pinfo->private_data ){
if(tree){
proto_tree_add_text(tree, tvb, offset, -1,
"Internal error:can't get spdu type from session dissector.");
return FALSE;
}
}else{
session = ( (struct SESSION_DATA_STRUCTURE*)(pinfo->private_data) );
if(session->spdu_type == 0 ){
if(tree){
proto_tree_add_text(tree, tvb, offset, -1,
"Internal error:wrong spdu type %x from session dissector.",session->spdu_type);
return FALSE;
}
}
}
/* get type of tag */
s_type = tvb_get_guint8(tvb, offset);
/* set up type of Ppdu */
if (check_col(pinfo->cinfo, COL_INFO))
col_add_str(pinfo->cinfo, COL_INFO,
val_to_str(session->spdu_type, ses_vals, "Unknown Ppdu type (0x%02x)"));
if (tree){
ti = proto_tree_add_item(tree, proto_pres, tvb, offset, -1,
FALSE);
pres_tree = proto_item_add_subtree(ti, ett_pres);
}
switch(session->spdu_type){
case SES_CONNECTION_REQUEST:
offset = dissect_pres_CP_type(FALSE, tvb, offset, pinfo, pres_tree, hf_pres_CP_type);
break;
case SES_CONNECTION_ACCEPT:
offset = dissect_pres_CPA_PPDU(FALSE, tvb, offset, pinfo, pres_tree, hf_pres_CPA_PPDU);
break;
case SES_ABORT:
case SES_ABORT_ACCEPT:
offset = dissect_pres_Abort_type(FALSE, tvb, offset, pinfo, pres_tree, hf_pres_Abort_type);
break;
case SES_DATA_TRANSFER:
offset = dissect_pres_CPC_type(FALSE, tvb, offset, pinfo, pres_tree, hf_pres_user_data);
break;
case SES_TYPED_DATA:
offset = dissect_pres_Typed_data_type(FALSE, tvb, offset, pinfo, pres_tree, hf_pres_Typed_data_type);
break;
case SES_RESYNCHRONIZE:
offset = dissect_pres_RS_PPDU(FALSE, tvb, offset, pinfo, pres_tree, -1);
break;
case SES_RESYNCHRONIZE_ACK:
offset = dissect_pres_RSA_PPDU(FALSE, tvb, offset, pinfo, pres_tree, -1);
break;
case SES_REFUSE:
offset = dissect_pres_CPR_PPDU(FALSE, tvb, offset, pinfo, pres_tree, hf_pres_CPR_PPDU);
break;
default:
offset = dissect_pres_CPC_type(FALSE, tvb, offset, pinfo, pres_tree, hf_pres_user_data);
break;
}
return offset;
}
void
dissect_pres(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree)
{
int offset = 0, old_offset;
/* first, try to check length */
/* do we have at least 4 bytes */
if (!tvb_bytes_exist(tvb, 0, 4)){
proto_tree_add_text(parent_tree, tvb, offset,
tvb_reported_length_remaining(tvb,offset),"User data");
return; /* no, it isn't a presentation PDU */
}
/* we can't make any additional checking here */
/* postpone it before dissector will have more information */
if (check_col(pinfo->cinfo, COL_PROTOCOL))
col_set_str(pinfo->cinfo, COL_PROTOCOL, "PRES");
if (check_col(pinfo->cinfo, COL_INFO))
col_clear(pinfo->cinfo, COL_INFO);
/* save pointers for calling the acse dissector */
global_tree = parent_tree;
global_pinfo = pinfo;
while (tvb_reported_length_remaining(tvb, offset) > 0){
old_offset = offset;
offset = dissect_ppdu(tvb, offset, pinfo, parent_tree);
if(offset <= old_offset){
proto_tree_add_text(parent_tree, tvb, offset, -1,"Invalid offset");
THROW(ReportedBoundsError);
}
}
}
/*--- proto_register_pres -------------------------------------------*/
void proto_register_pres(void) {
/* List of fields */
static hf_register_info hf[] = {
{ &hf_pres_CP_type,
{ "CP-type", "pres.cptype",
FT_NONE, BASE_NONE, NULL, 0,
"", HFILL }},
{ &hf_pres_CPA_PPDU,
{ "CPA-PPDU", "pres.cpapdu",
FT_NONE, BASE_NONE, NULL, 0,
"", HFILL }},
{ &hf_pres_Abort_type,
{ "Abort type", "pres.aborttype",
FT_UINT32, BASE_DEC, VALS(pres_Abort_type_vals), 0,
"", HFILL }},
{ &hf_pres_CPR_PPDU,
{ "CPR-PPDU", "pres.cprtype",
FT_UINT32, BASE_DEC, VALS(pres_CPR_PPDU_vals), 0,
"", HFILL }},
{ &hf_pres_Typed_data_type,
{ "Typed data type", "pres.Typed_data_type",
FT_UINT32, BASE_DEC, VALS(pres_Typed_data_type_vals), 0,
"", HFILL }},
#include "packet-pres-hfarr.c"
};
/* List of subtrees */
static gint *ett[] = {
&ett_pres,
#include "packet-pres-ettarr.c"
};
/* Register protocol */
proto_pres = proto_register_protocol(PNAME, PSNAME, PFNAME);
register_dissector("pres", dissect_pres, proto_pres);
/* Register fields and subtrees */
proto_register_field_array(proto_pres, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
register_init_routine(pres_init);
}
/*--- proto_reg_handoff_pres ---------------------------------------*/
void proto_reg_handoff_pres(void) {
/* register_ber_oid_dissector("0.4.0.0.1.1.1.1", dissect_pres, proto_pres,
"itu-t(0) identified-organization(4) etsi(0) mobileDomain(0) gsm-Network(1) abstractSyntax(1) pres(1) version1(1)"); */
data_handle = find_dissector("data");
}
|
