forked from osmocom/wireshark
eca5a7d7d4
This dissects the initial Connect-Initial and Connect-confirm pdus of setting up t.125 The dissector needs to be enhanced to also decode the data payload so that it can decode any furhter packets on the connection after these two initial handshake packets svn path=/trunk/; revision=23307
332 lines
7.9 KiB
C
332 lines
7.9 KiB
C
/* packet-x224.c
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*
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* Routine to dissect X.224
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* Copyright 2007, Ronnie Sahlberg
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*
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* $Id$
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <glib.h>
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#include <epan/packet.h>
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#include "packet-tpkt.h"
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#include "packet-frame.h"
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#include <epan/conversation.h>
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#include <epan/prefs.h>
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#include <epan/emem.h>
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/* X.224 header fields */
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static int proto_x224 = -1;
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static int hf_x224_length = -1;
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static int hf_x224_code = -1;
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static int hf_x224_src_ref = -1;
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static int hf_x224_dst_ref = -1;
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static int hf_x224_class = -1;
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static int hf_x224_nr = -1;
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static int hf_x224_eot = -1;
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/* X.224 fields defining a sub tree */
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static gint ett_x224 = -1;
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/* find the dissector for T.125 */
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static dissector_handle_t t125_handle;
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typedef struct _x224_conv_info_t {
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guint8 class;
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} x224_conv_info_t;
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#define X224_CODE_CR 0xE
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#define X224_CODE_CC 0xD
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#define X224_CODE_DR 0x8
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#define X224_CODE_DC 0xC
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#define X224_CODE_DT 0xF
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#define X224_CODE_ED 0x1
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#define X224_CODE_AK 0x6
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#define X224_CODE_EA 0x2
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#define X224_CODE_RJ 0x5
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#define X224_CODE_ER 0x7
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static const value_string code_vals[] = {
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{X224_CODE_CR, "Connection Request"},
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{X224_CODE_CC, "Connection Confirm"},
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{X224_CODE_DR, "Disconnect Request"},
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{X224_CODE_DC, "Disconnect Confirm"},
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{X224_CODE_DT, "Data"},
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{X224_CODE_ED, "Expedited Data"},
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{X224_CODE_AK, "Data Ack"},
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{X224_CODE_EA, "Expedited Data Ack"},
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{X224_CODE_RJ, "Reject"},
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{X224_CODE_ER, "Error"},
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{0,NULL}
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};
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static const value_string class_option_vals[] = {
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{0, "Class 0"},
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{1, "Class 1"},
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{2, "Class 2"},
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{3, "Class 3"},
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{4, "Class 4"},
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{0,NULL}
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};
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static int
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dissect_x224_cr(packet_info *pinfo _U_, proto_tree *tree, tvbuff_t *tvb, int offset, x224_conv_info_t *x224_info _U_)
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{
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guint8 class;
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/*DST-REF is always 0 */
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offset+=2;
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/*SRC-REF*/
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proto_tree_add_item(tree, hf_x224_src_ref, tvb, offset, 2, FALSE);
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offset+=2;
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/* class options */
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class = tvb_get_guint8(tvb, offset);
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proto_tree_add_item(tree, hf_x224_class, tvb, offset, 1, FALSE);
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offset+=1;
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return offset;
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}
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static int
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dissect_x224_cc(packet_info *pinfo _U_, proto_tree *tree, tvbuff_t *tvb, int offset, x224_conv_info_t *x224_info)
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{
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guint8 class;
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/*DST-REF */
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proto_tree_add_item(tree, hf_x224_dst_ref, tvb, offset, 2, FALSE);
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offset+=2;
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/*SRC-REF*/
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proto_tree_add_item(tree, hf_x224_src_ref, tvb, offset, 2, FALSE);
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offset+=2;
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/* class options */
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class = tvb_get_guint8(tvb, offset);
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proto_tree_add_item(tree, hf_x224_class, tvb, offset, 1, FALSE);
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x224_info->class = class;
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offset+=1;
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return offset;
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}
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static int
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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)
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{
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proto_item *item = NULL;
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tvbuff_t *next_tvb;
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switch (x224_info->class >>4) {
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case 2:
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case 3:
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case 4:
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/*DST-REF */
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proto_tree_add_item(tree, hf_x224_dst_ref, tvb, offset, 2, FALSE);
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offset+=2;
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break;
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}
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item = proto_tree_add_uint(tree, hf_x224_class, tvb, 0, 0, x224_info->class);
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PROTO_ITEM_SET_GENERATED(item);
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/* EOT / NR */
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proto_tree_add_item(tree, hf_x224_eot, tvb, offset, 1, FALSE);
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proto_tree_add_item(tree, hf_x224_nr, tvb, offset, 1, FALSE);
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offset+=1;
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next_tvb = tvb_new_subset(tvb, offset, -1, -1);
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call_dissector(t125_handle, next_tvb, pinfo, parent_tree);
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return offset;
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}
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static void
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dissect_x224(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree)
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{
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proto_tree *tree = NULL;
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proto_item *item = NULL;
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int offset = 0 ;
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guint8 code, length;
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conversation_t *conversation;
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x224_conv_info_t *x224_info;
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if (check_col(pinfo->cinfo, COL_PROTOCOL)){
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "X.224");
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}
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if (check_col(pinfo->cinfo, COL_INFO)){
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col_clear(pinfo->cinfo, COL_INFO);
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}
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length = tvb_get_guint8(tvb, offset);
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if (parent_tree) {
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item = proto_tree_add_item(parent_tree, proto_x224, tvb, offset, length+1, FALSE);
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tree = proto_item_add_subtree(item, ett_x224);
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}
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/* length indicator */
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proto_tree_add_item(tree, hf_x224_length, tvb, offset, 1, FALSE);
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offset+=1;
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/* code */
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code = tvb_get_guint8(tvb, offset);
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proto_tree_add_item(tree, hf_x224_code, tvb, offset, 1, FALSE);
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offset+=1;
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if (check_col(pinfo->cinfo, COL_INFO)) {
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col_add_fstr(pinfo->cinfo, COL_INFO, "%s (0x%02x)",
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val_to_str(code>>4, code_vals, "Unknown code :%x"),
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code);
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}
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/*
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* We need to track some state for this protocol on a per conversation
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* basis so we can do neat things like request/response tracking
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*/
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/*
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* Do we have a conversation for this connection?
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*/
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conversation = find_conversation(pinfo->fd->num,
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&pinfo->src, &pinfo->dst,
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pinfo->ptype,
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pinfo->srcport, pinfo->destport, 0);
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if (conversation == NULL) {
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/* We don't yet have a conversation, so create one. */
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conversation = conversation_new(pinfo->fd->num,
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&pinfo->src, &pinfo->dst,
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pinfo->ptype,
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pinfo->srcport, pinfo->destport, 0);
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}
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/*
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* Do we already have a state structure for this conv
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*/
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x224_info = conversation_get_proto_data(conversation, proto_x224);
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if (!x224_info) {
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/* No. Attach that information to the conversation, and add
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* it to the list of information structures.
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*/
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x224_info = se_alloc(sizeof(x224_conv_info_t));
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x224_info->class=0;
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conversation_add_proto_data(conversation, proto_x224, x224_info);
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}
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switch (code>>4) {
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case X224_CODE_CR:
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offset = dissect_x224_cr(pinfo, tree, tvb, offset, x224_info);
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break;
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case X224_CODE_CC:
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offset = dissect_x224_cc(pinfo, tree, tvb, offset, x224_info);
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break;
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case X224_CODE_DR:
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/* XXX not implemented yet */
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break;
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case X224_CODE_DC:
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/* XXX not implemented yet */
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break;
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case X224_CODE_DT:
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offset = dissect_x224_dt(pinfo, tree, tvb, offset, x224_info, parent_tree);
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break;
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case X224_CODE_ED:
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/* XXX not implemented yet */
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break;
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case X224_CODE_AK:
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/* XXX not implemented yet */
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break;
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case X224_CODE_EA:
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/* XXX not implemented yet */
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break;
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case X224_CODE_RJ:
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/* XXX not implemented yet */
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break;
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case X224_CODE_ER:
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/* XXX not implemented yet */
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break;
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}
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}
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void
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proto_register_x224(void)
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{
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static hf_register_info hf[] =
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{
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{ &hf_x224_length, {
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"Length", "x224.length", FT_UINT8, BASE_DEC,
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NULL, 0, "", HFILL }},
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{ &hf_x224_code, {
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"Code", "x224.code", FT_UINT8, BASE_HEX,
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VALS(code_vals), 0xf0, "", HFILL }},
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{ &hf_x224_src_ref, {
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"SRC-REF", "x224.src_ref", FT_UINT16, BASE_HEX,
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NULL, 0, "", HFILL }},
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{ &hf_x224_dst_ref, {
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"DST-REF", "x224.dst_ref", FT_UINT16, BASE_HEX,
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NULL, 0, "", HFILL }},
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{ &hf_x224_class, {
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"Class", "x224.class", FT_UINT8, BASE_HEX,
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VALS(class_option_vals), 0xf0, "", HFILL }},
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{ &hf_x224_nr, {
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"NR", "x224.nr", FT_UINT8, BASE_HEX,
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NULL, 0x7f, "", HFILL }},
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{ &hf_x224_eot, {
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"EOT", "x224.eot", FT_BOOLEAN, 8,
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NULL, 0x80, "", HFILL }},
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};
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static gint *ett[] =
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{
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&ett_x224,
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};
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proto_x224 = proto_register_protocol("ITU-T Rec X.224 ", "X.224", "x224");
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proto_register_field_array(proto_x224, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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register_dissector("x224", dissect_x224, proto_x224);
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}
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void
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proto_reg_handoff_x224(void)
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{
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t125_handle = find_dissector("t125");
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}
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