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