/* packet-x29.c * Routines for X.29 packet dissection * * Wireshark - 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #include "config.h" #include #include void proto_register_x29(void); void proto_reg_handoff_x29(void); static int proto_x29 = -1; static int hf_msg_code = -1; static int hf_error_type = -1; static int hf_inv_msg_code = -1; /* Generated from convert_proto_tree_add_text.pl */ static int hf_x29_pad_message_data = -1; static int hf_x29_type_reference_value = -1; static int hf_x29_type_reference = -1; static int hf_x29_data = -1; static int hf_x29_type_of_aspect = -1; static int hf_x29_reselection_message_data = -1; static int hf_x29_break_value = -1; static int hf_x29_parameter = -1; static int hf_x29_value = -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 const value_string reference_type_vals[] = { { 0x01, "Change in PAD Aspect" }, { 0x08, "Break" }, { 0, NULL }, }; static int dissect_x29(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data) { int offset = 0; proto_tree *x29_tree; proto_item *ti; gboolean *q_bit_set; guint8 msg_code; guint8 error_type; guint8 type_ref; gint next_offset; int linelen; /* Reject the packet if data is NULL */ if (data == NULL) return 0; q_bit_set = (gboolean *)data; col_set_str(pinfo->cinfo, COL_PROTOCOL, "X.29"); col_clear(pinfo->cinfo, COL_INFO); ti = proto_tree_add_item(tree, proto_x29, tvb, offset, -1, ENC_NA); 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); 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_item(x29_tree, hf_x29_parameter, tvb, offset, 1, ENC_BIG_ENDIAN); offset++; proto_tree_add_item(x29_tree, hf_x29_value, tvb, offset, 1, ENC_BIG_ENDIAN); offset++; } 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, ENC_BIG_ENDIAN); } break; case BREAK_IND_MSG: if (tvb_reported_length_remaining(tvb, offset) > 0) { type_ref = tvb_get_guint8(tvb, offset); proto_tree_add_item(x29_tree, hf_x29_type_reference, tvb, offset, 1, ENC_BIG_ENDIAN); offset++; switch (type_ref) { case 0x01: /* change in PAD Aspect */ /* * XXX - dissect as per X.28. */ proto_tree_add_item(x29_tree, hf_x29_type_of_aspect, tvb, offset, 1, ENC_BIG_ENDIAN); offset++; break; case 0x08: /* break */ proto_tree_add_item(x29_tree, hf_x29_break_value, tvb, offset, 1, ENC_BIG_ENDIAN); offset++; break; default: proto_tree_add_item(x29_tree, hf_x29_type_reference_value, tvb, offset, 1, ENC_BIG_ENDIAN); offset++; break; } } break; case RESELECTION_MSG: /* * XXX - dissect me. */ proto_tree_add_item(x29_tree, hf_x29_reselection_message_data, tvb, offset, -1, ENC_NA); break; case RESEL_WITH_TOA_NPI_MSG: /* * XXX - dissect me. */ proto_tree_add_item(x29_tree, hf_x29_reselection_message_data, tvb, offset, -1, ENC_NA); break; default: proto_tree_add_item(x29_tree, hf_x29_pad_message_data, tvb, offset, -1, ENC_NA); break; } } else { /* * Q bit not set - this is data. */ col_set_str(pinfo->cinfo, COL_INFO, "Data ..."); if (tree) { while (tvb_offset_exists(tvb, offset)) { /* * Find the end of the line. */ 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_item(x29_tree, hf_x29_data, tvb, offset, linelen, ENC_NA|ENC_ASCII); offset = next_offset; } } } return tvb_captured_length(tvb); } 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 }}, /* Generated from convert_proto_tree_add_text.pl */ { &hf_x29_type_reference, { "Type reference", "x29.type_reference", FT_UINT8, BASE_DEC, VALS(reference_type_vals), 0x0, NULL, HFILL }}, { &hf_x29_type_of_aspect, { "Type of aspect", "x29.type_of_aspect", FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL }}, { &hf_x29_break_value, { "Break value", "x29.break_value", FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL }}, { &hf_x29_type_reference_value, { "Type value", "x29.type_reference.value", FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL }}, { &hf_x29_reselection_message_data, { "Reselection message data", "x29.reselection_message_data", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }}, { &hf_x29_pad_message_data, { "PAD message data", "x29.pad_message_data", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }}, { &hf_x29_data, { "Data", "x29.data", FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }}, { &hf_x29_parameter, { "Parameter", "x29.parameter", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }}, { &hf_x29_value, { "Value", "x29.value", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }}, }; static gint *ett[] = { &ett_x29, }; proto_x29 = proto_register_protocol("X.29", "X.29", "x29"); 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_uint("x.25.spi", NLPID_SPI_X_29, x29_handle); } /* * Editor modelines - http://www.wireshark.org/tools/modelines.html * * Local variables: * c-basic-offset: 8 * tab-width: 8 * indent-tabs-mode: t * End: * * vi: set shiftwidth=8 tabstop=8 noexpandtab: * :indentSize=8:tabSize=8:noTabs=false: */