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|
/* packet-x224.c
*
* Routine to dissect X.224
* Copyright 2007, Ronnie Sahlberg
*
* $Id$
*
* 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., 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 "packet-tpkt.h"
#include "packet-frame.h"
#include <epan/conversation.h>
#include <epan/prefs.h>
#include <epan/emem.h>
/* X.224 header fields */
static int proto_x224 = -1;
static int hf_x224_length = -1;
static int hf_x224_code = -1;
static int hf_x224_src_ref = -1;
static int hf_x224_dst_ref = -1;
static int hf_x224_class = -1;
static int hf_x224_nr = -1;
static int hf_x224_eot = -1;
/* X.224 fields defining a sub tree */
static gint ett_x224 = -1;
/* find the dissector for T.125 */
static dissector_handle_t t125_handle;
typedef struct _x224_conv_info_t {
guint8 class;
} x224_conv_info_t;
#define X224_CODE_CR 0xE
#define X224_CODE_CC 0xD
#define X224_CODE_DR 0x8
#define X224_CODE_DC 0xC
#define X224_CODE_DT 0xF
#define X224_CODE_ED 0x1
#define X224_CODE_AK 0x6
#define X224_CODE_EA 0x2
#define X224_CODE_RJ 0x5
#define X224_CODE_ER 0x7
static const value_string code_vals[] = {
{X224_CODE_CR, "Connection Request"},
{X224_CODE_CC, "Connection Confirm"},
{X224_CODE_DR, "Disconnect Request"},
{X224_CODE_DC, "Disconnect Confirm"},
{X224_CODE_DT, "Data"},
{X224_CODE_ED, "Expedited Data"},
{X224_CODE_AK, "Data Ack"},
{X224_CODE_EA, "Expedited Data Ack"},
{X224_CODE_RJ, "Reject"},
{X224_CODE_ER, "Error"},
{0,NULL}
};
static const value_string class_option_vals[] = {
{0, "Class 0"},
{1, "Class 1"},
{2, "Class 2"},
{3, "Class 3"},
{4, "Class 4"},
{0,NULL}
};
static int
dissect_x224_cr(packet_info *pinfo _U_, proto_tree *tree, tvbuff_t *tvb, int offset, x224_conv_info_t *x224_info _U_)
{
guint8 class;
/*DST-REF is always 0 */
offset+=2;
/*SRC-REF*/
proto_tree_add_item(tree, hf_x224_src_ref, tvb, offset, 2, FALSE);
offset+=2;
/* class options */
class = tvb_get_guint8(tvb, offset);
proto_tree_add_item(tree, hf_x224_class, tvb, offset, 1, FALSE);
offset+=1;
return offset;
}
static int
dissect_x224_cc(packet_info *pinfo _U_, proto_tree *tree, tvbuff_t *tvb, int offset, x224_conv_info_t *x224_info)
{
guint8 class;
/*DST-REF */
proto_tree_add_item(tree, hf_x224_dst_ref, tvb, offset, 2, FALSE);
offset+=2;
/*SRC-REF*/
proto_tree_add_item(tree, hf_x224_src_ref, tvb, offset, 2, FALSE);
offset+=2;
/* class options */
class = tvb_get_guint8(tvb, offset);
proto_tree_add_item(tree, hf_x224_class, tvb, offset, 1, FALSE);
x224_info->class = class;
offset+=1;
return offset;
}
static int
dissect_x224_dt(packet_info *pinfo _U_, proto_tree *tree, tvbuff_t *tvb, int offset, x224_conv_info_t *x224_info, proto_tree *parent_tree)
{
proto_item *item = NULL;
tvbuff_t *next_tvb;
switch (x224_info->class >>4) {
case 2:
case 3:
case 4:
/*DST-REF */
proto_tree_add_item(tree, hf_x224_dst_ref, tvb, offset, 2, FALSE);
offset+=2;
break;
}
item = proto_tree_add_uint(tree, hf_x224_class, tvb, 0, 0, x224_info->class);
PROTO_ITEM_SET_GENERATED(item);
/* EOT / NR */
proto_tree_add_item(tree, hf_x224_eot, tvb, offset, 1, FALSE);
proto_tree_add_item(tree, hf_x224_nr, tvb, offset, 1, FALSE);
offset+=1;
next_tvb = tvb_new_subset(tvb, offset, -1, -1);
call_dissector(t125_handle, next_tvb, pinfo, parent_tree);
return offset;
}
static void
dissect_x224(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree)
{
proto_tree *tree = NULL;
proto_item *item = NULL;
int offset = 0 ;
guint8 code, length;
conversation_t *conversation;
x224_conv_info_t *x224_info;
if (check_col(pinfo->cinfo, COL_PROTOCOL)){
col_set_str(pinfo->cinfo, COL_PROTOCOL, "X.224");
}
if (check_col(pinfo->cinfo, COL_INFO)){
col_clear(pinfo->cinfo, COL_INFO);
}
length = tvb_get_guint8(tvb, offset);
if (parent_tree) {
item = proto_tree_add_item(parent_tree, proto_x224, tvb, offset, length+1, FALSE);
tree = proto_item_add_subtree(item, ett_x224);
}
/* length indicator */
proto_tree_add_item(tree, hf_x224_length, tvb, offset, 1, FALSE);
offset+=1;
/* code */
code = tvb_get_guint8(tvb, offset);
proto_tree_add_item(tree, hf_x224_code, tvb, offset, 1, FALSE);
offset+=1;
if (check_col(pinfo->cinfo, COL_INFO)) {
col_add_fstr(pinfo->cinfo, COL_INFO, "%s (0x%02x)",
val_to_str(code>>4, code_vals, "Unknown code :%x"),
code);
}
/*
* We need to track some state for this protocol on a per conversation
* basis so we can do neat things like request/response tracking
*/
/*
* Do we have a conversation for this connection?
*/
conversation = find_conversation(pinfo->fd->num,
&pinfo->src, &pinfo->dst,
pinfo->ptype,
pinfo->srcport, pinfo->destport, 0);
if (conversation == NULL) {
/* We don't yet have a conversation, so create one. */
conversation = conversation_new(pinfo->fd->num,
&pinfo->src, &pinfo->dst,
pinfo->ptype,
pinfo->srcport, pinfo->destport, 0);
}
/*
* Do we already have a state structure for this conv
*/
x224_info = conversation_get_proto_data(conversation, proto_x224);
if (!x224_info) {
/* No. Attach that information to the conversation, and add
* it to the list of information structures.
*/
x224_info = se_alloc(sizeof(x224_conv_info_t));
x224_info->class=0;
conversation_add_proto_data(conversation, proto_x224, x224_info);
}
switch (code>>4) {
case X224_CODE_CR:
offset = dissect_x224_cr(pinfo, tree, tvb, offset, x224_info);
break;
case X224_CODE_CC:
offset = dissect_x224_cc(pinfo, tree, tvb, offset, x224_info);
break;
case X224_CODE_DR:
/* XXX not implemented yet */
break;
case X224_CODE_DC:
/* XXX not implemented yet */
break;
case X224_CODE_DT:
offset = dissect_x224_dt(pinfo, tree, tvb, offset, x224_info, parent_tree);
break;
case X224_CODE_ED:
/* XXX not implemented yet */
break;
case X224_CODE_AK:
/* XXX not implemented yet */
break;
case X224_CODE_EA:
/* XXX not implemented yet */
break;
case X224_CODE_RJ:
/* XXX not implemented yet */
break;
case X224_CODE_ER:
/* XXX not implemented yet */
break;
}
}
void
proto_register_x224(void)
{
static hf_register_info hf[] =
{
{ &hf_x224_length, {
"Length", "x224.length", FT_UINT8, BASE_DEC,
NULL, 0, "", HFILL }},
{ &hf_x224_code, {
"Code", "x224.code", FT_UINT8, BASE_HEX,
VALS(code_vals), 0xf0, "", HFILL }},
{ &hf_x224_src_ref, {
"SRC-REF", "x224.src_ref", FT_UINT16, BASE_HEX,
NULL, 0, "", HFILL }},
{ &hf_x224_dst_ref, {
"DST-REF", "x224.dst_ref", FT_UINT16, BASE_HEX,
NULL, 0, "", HFILL }},
{ &hf_x224_class, {
"Class", "x224.class", FT_UINT8, BASE_HEX,
VALS(class_option_vals), 0xf0, "", HFILL }},
{ &hf_x224_nr, {
"NR", "x224.nr", FT_UINT8, BASE_HEX,
NULL, 0x7f, "", HFILL }},
{ &hf_x224_eot, {
"EOT", "x224.eot", FT_BOOLEAN, 8,
NULL, 0x80, "", HFILL }},
};
static gint *ett[] =
{
&ett_x224,
};
proto_x224 = proto_register_protocol("ITU-T Rec X.224 ", "X.224", "x224");
proto_register_field_array(proto_x224, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
register_dissector("x224", dissect_x224, proto_x224);
}
void
proto_reg_handoff_x224(void)
{
t125_handle = find_dissector("t125");
}
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