forked from osmocom/wireshark
![Dario Lombardo](/assets/img/avatar_default.png)
Change-Id: I92c94448e6641716d03158a5f332c8b53709423a Reviewed-on: https://code.wireshark.org/review/25756 Petri-Dish: Dario Lombardo <lomato@gmail.com> Reviewed-by: Anders Broman <a.broman58@gmail.com>
285 lines
8 KiB
C
285 lines
8 KiB
C
/* packet-x29.c
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* Routines for X.29 packet dissection
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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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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "config.h"
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#include <epan/packet.h>
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#include <epan/nlpid.h>
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void proto_register_x29(void);
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void proto_reg_handoff_x29(void);
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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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/* Generated from convert_proto_tree_add_text.pl */
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static int hf_x29_pad_message_data = -1;
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static int hf_x29_type_reference_value = -1;
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static int hf_x29_type_reference = -1;
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static int hf_x29_data = -1;
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static int hf_x29_type_of_aspect = -1;
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static int hf_x29_reselection_message_data = -1;
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static int hf_x29_break_value = -1;
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static int hf_x29_parameter = -1;
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static int hf_x29_value = -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 const value_string reference_type_vals[] = {
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{ 0x01, "Change in PAD Aspect" },
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{ 0x08, "Break" },
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{ 0, NULL },
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};
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static int
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dissect_x29(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data)
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{
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int offset = 0;
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proto_tree *x29_tree;
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proto_item *ti;
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gboolean *q_bit_set;
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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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/* Reject the packet if data is NULL */
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if (data == NULL)
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return 0;
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q_bit_set = (gboolean *)data;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "X.29");
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col_clear(pinfo->cinfo, COL_INFO);
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ti = proto_tree_add_item(tree, proto_x29, tvb, offset, -1, ENC_NA);
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x29_tree = proto_item_add_subtree(ti, ett_x29);
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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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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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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_item(x29_tree, hf_x29_parameter, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset++;
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proto_tree_add_item(x29_tree, hf_x29_value, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset++;
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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, ENC_BIG_ENDIAN);
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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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proto_tree_add_item(x29_tree, hf_x29_type_reference, tvb, offset, 1, ENC_BIG_ENDIAN);
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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_item(x29_tree, hf_x29_type_of_aspect, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset++;
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break;
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case 0x08: /* break */
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proto_tree_add_item(x29_tree, hf_x29_break_value, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset++;
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break;
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default:
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proto_tree_add_item(x29_tree, hf_x29_type_reference_value, tvb, offset, 1, ENC_BIG_ENDIAN);
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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_item(x29_tree, hf_x29_reselection_message_data, tvb, offset, -1, ENC_NA);
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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_item(x29_tree, hf_x29_reselection_message_data, tvb, offset, -1, ENC_NA);
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break;
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default:
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proto_tree_add_item(x29_tree, hf_x29_pad_message_data, tvb, offset, -1, ENC_NA);
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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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col_set_str(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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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_item(x29_tree, hf_x29_data, tvb, offset, linelen, ENC_NA|ENC_ASCII);
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offset = next_offset;
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}
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}
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}
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return tvb_captured_length(tvb);
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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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/* Generated from convert_proto_tree_add_text.pl */
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{ &hf_x29_type_reference, { "Type reference", "x29.type_reference", FT_UINT8, BASE_DEC, VALS(reference_type_vals), 0x0, NULL, HFILL }},
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{ &hf_x29_type_of_aspect, { "Type of aspect", "x29.type_of_aspect", FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL }},
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{ &hf_x29_break_value, { "Break value", "x29.break_value", FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL }},
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{ &hf_x29_type_reference_value, { "Type value", "x29.type_reference.value", FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL }},
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{ &hf_x29_reselection_message_data, { "Reselection message data", "x29.reselection_message_data", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
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{ &hf_x29_pad_message_data, { "PAD message data", "x29.pad_message_data", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
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{ &hf_x29_data, { "Data", "x29.data", FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }},
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{ &hf_x29_parameter, { "Parameter", "x29.parameter", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
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{ &hf_x29_value, { "Value", "x29.value", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, 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", "x29");
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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_uint("x.25.spi", NLPID_SPI_X_29, x29_handle);
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}
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/*
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* Editor modelines - http://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 8
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* tab-width: 8
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* indent-tabs-mode: t
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* End:
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*
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* vi: set shiftwidth=8 tabstop=8 noexpandtab:
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* :indentSize=8:tabSize=8:noTabs=false:
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*/
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