forked from osmocom/wireshark
282 lines
7.3 KiB
C
282 lines
7.3 KiB
C
/* packet-x29.c
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* Routines for X.29 packet dissection
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*
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* $Id: packet-x29.c,v 1.1 2003/01/06 02:24:57 guy Exp $
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@ethereal.com>
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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 <stdio.h>
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#include <string.h>
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#include <glib.h>
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#include <epan/packet.h>
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#include <epan/strutil.h>
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#include "nlpid.h"
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static int proto_x29 = -1;
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static int hf_msg_code = -1;
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static int hf_error_type = -1;
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static int hf_inv_msg_code = -1;
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static gint ett_x29 = -1;
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/*
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* PAD messages.
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*/
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#define SET_MSG 0x02
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#define READ_MSG 0x04
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#define SET_AND_READ_MSG 0x06
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#define PARAMETER_IND_MSG 0x00
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#define INV_TO_CLEAR_MSG 0x01
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#define BREAK_IND_MSG 0x03
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#define RESELECTION_MSG 0x07
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#define ERROR_MSG 0x05
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#define RESEL_WITH_TOA_NPI_MSG 0x08
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static const value_string message_code_vals[] = {
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{ SET_MSG, "Set" },
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{ READ_MSG, "Read" },
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{ SET_AND_READ_MSG, "Set and read" },
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{ PARAMETER_IND_MSG, "Parameter indication" },
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{ INV_TO_CLEAR_MSG, "Invitation to clear" },
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{ BREAK_IND_MSG, "Indication of break" },
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{ RESELECTION_MSG, "Reselection" },
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{ ERROR_MSG, "Error" },
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{ RESEL_WITH_TOA_NPI_MSG, "Reselection with TOA/NPI" },
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{ 0, NULL }
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};
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static const value_string error_type_vals[] = {
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{ 0x00, "Received PAD message contained less than eight bits" },
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{ 0x02, "Unrecognized message code in received PAD message" },
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{ 0x04, "Parameter field format was incorrect or incompatible with message code" },
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{ 0x06, "Received PAD message did not contain an integral number of octets" },
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{ 0x08, "Received Parameter Indication PAD message was unsolicited" },
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{ 0x0A, "Received PAD message was too long" },
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{ 0x0C, "Unauthorized reselection PAD message" },
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{ 0, NULL },
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};
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static void
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dissect_x29(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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int offset = 0;
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proto_tree *x29_tree = NULL;
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proto_item *ti;
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gboolean *q_bit_set = pinfo->private_data;
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guint8 msg_code;
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guint8 error_type;
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guint8 type_ref;
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gint next_offset;
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int linelen;
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if (check_col(pinfo->cinfo, COL_PROTOCOL))
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "X.29");
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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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if (tree) {
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ti = proto_tree_add_item(tree, proto_x29, tvb, offset, -1,
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FALSE);
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x29_tree = proto_item_add_subtree(ti, ett_x29);
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}
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if (*q_bit_set) {
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/*
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* Q bit set - this is a PAD message.
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*/
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msg_code = tvb_get_guint8(tvb, offset);
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if (check_col(pinfo->cinfo, COL_INFO)) {
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col_add_fstr(pinfo->cinfo, COL_INFO, "%s PAD message",
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val_to_str(msg_code, message_code_vals,
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"Unknown (0x%02x)"));
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}
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proto_tree_add_uint(x29_tree, hf_msg_code, tvb,
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offset, 1, msg_code);
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offset++;
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switch (msg_code) {
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case SET_MSG:
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case READ_MSG:
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case SET_AND_READ_MSG:
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case PARAMETER_IND_MSG:
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/*
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* XXX - dissect the references as per X.3.
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*/
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while (tvb_reported_length_remaining(tvb, offset) > 0) {
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proto_tree_add_text(x29_tree, tvb, offset, 2,
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"Parameter %u, value %u",
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tvb_get_guint8(tvb, offset),
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tvb_get_guint8(tvb, offset + 1));
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offset += 2;
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}
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break;
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case INV_TO_CLEAR_MSG:
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/*
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* No data for this message.
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*/
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break;
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case ERROR_MSG:
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error_type = tvb_get_guint8(tvb, offset);
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proto_tree_add_uint(x29_tree, hf_error_type, tvb,
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offset, 1, error_type);
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offset++;
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if (error_type != 0) {
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proto_tree_add_item(x29_tree, hf_inv_msg_code,
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tvb, offset, 1, FALSE);
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}
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break;
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case BREAK_IND_MSG:
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if (tvb_reported_length_remaining(tvb, offset) > 0) {
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type_ref = tvb_get_guint8(tvb, offset);
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switch (type_ref) {
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case 0x01: /* change in PAD Aspect */
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/*
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* XXX - dissect as per X.28.
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*/
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proto_tree_add_text(x29_tree, tvb,
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offset, 1, "Type reference: Change in PAD Aspect");
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offset++;
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proto_tree_add_text(x29_tree, tvb,
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offset, 1, "Type of aspect: 0x%02x",
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type_ref);
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offset++;
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break;
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case 0x08: /* break */
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proto_tree_add_text(x29_tree, tvb,
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offset, 1, "Type reference: Break");
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offset++;
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proto_tree_add_text(x29_tree, tvb,
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offset, 1, "Break value: 0x%02x",
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type_ref);
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offset++;
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break;
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default:
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proto_tree_add_text(x29_tree, tvb,
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offset, 1, "Unknown type reference (0x%02x)",
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type_ref);
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offset++;
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proto_tree_add_text(x29_tree, tvb,
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offset, 1, "Type value: 0x%02x",
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type_ref);
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offset++;
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break;
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}
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}
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break;
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case RESELECTION_MSG:
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/*
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* XXX - dissect me.
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*/
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proto_tree_add_text(x29_tree, tvb, offset, -1,
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"Reselection message data");
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break;
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case RESEL_WITH_TOA_NPI_MSG:
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/*
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* XXX - dissect me.
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*/
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proto_tree_add_text(x29_tree, tvb, offset, -1,
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"Reselection message data");
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break;
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default:
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proto_tree_add_text(x29_tree, tvb, offset, -1,
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"PAD message data");
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break;
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}
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} else {
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/*
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* Q bit not set - this is data.
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*/
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if (check_col(pinfo->cinfo, COL_INFO))
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col_add_fstr(pinfo->cinfo, COL_INFO, "Data ...");
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if (tree) {
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while (tvb_offset_exists(tvb, offset)) {
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/*
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* Find the end of the line.
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*/
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linelen = tvb_find_line_end(tvb, offset, -1,
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&next_offset, FALSE);
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/*
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* Now compute the length of the line
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* *including* the end-of-line indication,
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* if any; we display it all.
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*/
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linelen = next_offset - offset;
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proto_tree_add_text(x29_tree, tvb, offset,
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linelen, "Data: %s",
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tvb_format_text(tvb, offset, linelen));
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offset = next_offset;
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}
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}
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}
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}
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void
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proto_register_x29(void)
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{
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static hf_register_info hf[] = {
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{ &hf_msg_code,
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{ "Message code", "x29.msg_code", FT_UINT8, BASE_HEX,
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VALS(message_code_vals), 0x0, "X.29 PAD message code",
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HFILL }},
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{ &hf_error_type,
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{ "Error type", "x29.error_type", FT_UINT8, BASE_HEX,
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VALS(error_type_vals), 0x0, "X.29 error PAD message error type",
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HFILL }},
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{ &hf_inv_msg_code,
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{ "Invalid message code", "x29.inv_msg_code", FT_UINT8, BASE_HEX,
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VALS(message_code_vals), 0x0, "X.29 Error PAD message invalid message code",
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HFILL }},
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};
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static gint *ett[] = {
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&ett_x29,
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};
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proto_x29 = proto_register_protocol("X.29", "X.29", "x.29");
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proto_register_field_array(proto_x29, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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}
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void
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proto_reg_handoff_x29(void)
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{
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dissector_handle_t x29_handle;
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x29_handle = create_dissector_handle(dissect_x29, proto_x29);
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dissector_add("x.25.spi", NLPID_SPI_X_29, x29_handle);
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}
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