1014 lines
33 KiB
C
1014 lines
33 KiB
C
/*
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* packet-mdb.c
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* Routines for MDB dissection
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* Copyright 2023 Martin Kaiser for PayTec AG (www.paytec.ch)
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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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/*
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* The MDB (Multi-Drop Bus) protocol is used inside a vending machine. MDB
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* defines the communication between the main control board (VMC = Vending
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* Machine Controller) and peripheral components, e.g. a payment terminal
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* or a bill validator.
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*
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* The VMC acts as bus master and sends a request to one peripheral at a time.
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* A peripheral may send data only in response to such a request.
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*
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* The MDB specification is maintained by the National Automatic Merchandising
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* Association (NAMA). As of August 2023, the current version of the MDB
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* specification is 4.3. It is available from
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* https://namanow.org/nama-releases-mdb-version-4-3/
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*
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* The pcap input format for this dissector is documented at
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* https://www.kaiser.cx/pcap-mdb.html
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*/
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#include "config.h"
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#include <epan/expert.h>
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#include <epan/packet.h>
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#include <wiretap/wtap.h>
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void proto_register_mdb(void);
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static dissector_handle_t mdb_handle;
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static int proto_mdb;
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static int ett_mdb;
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static int ett_mdb_hdr;
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static int ett_mdb_cl;
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static int ett_mdb_cgw;
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static int hf_mdb_hdr_ver;
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static int hf_mdb_event;
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static int hf_mdb_addr;
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static int hf_mdb_cmd;
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static int hf_mdb_cl_setup_sub;
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static int hf_mdb_cl_feat_lvl;
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static int hf_mdb_cl_cols;
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static int hf_mdb_cl_rows;
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static int hf_mdb_cl_disp_info;
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static int hf_mdb_cl_max_price;
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static int hf_mdb_cl_min_price;
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static int hf_mdb_cl_vend_sub;
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static int hf_mdb_cl_item_price;
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static int hf_mdb_cl_item_num;
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static int hf_mdb_cl_reader_sub;
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static int hf_mdb_cl_resp;
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static int hf_mdb_cl_scale;
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static int hf_mdb_cl_dec_pl;
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static int hf_mdb_cl_max_rsp_time;
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static int hf_mdb_cl_vend_amt;
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static int hf_mdb_cl_expns_sub;
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static int hf_mdb_cl_manuf_code;
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static int hf_mdb_cl_ser_num;
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static int hf_mdb_cl_mod_num;
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static int hf_mdb_cl_opt_feat;
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static int hf_mdb_cgw_feat_lvl;
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static int hf_mdb_cgw_scale;
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static int hf_mdb_cgw_dec_pl;
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static int hf_mdb_cgw_resp;
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static int hf_mdb_cgw_max_rsp_time;
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static int hf_mdb_cgw_report_sub;
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static int hf_mdb_cgw_dts_evt_code;
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static int hf_mdb_cgw_duration;
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static int hf_mdb_cgw_activity;
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static int hf_mdb_cgw_expns_sub;
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static int hf_mdb_cgw_opt_feat;
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static int hf_mdb_cgw_manuf_code;
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static int hf_mdb_cgw_ser_num;
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static int hf_mdb_cgw_mod_num;
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static int hf_mdb_ack;
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static int hf_mdb_data;
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static int hf_mdb_chk;
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static expert_field ei_mdb_short_packet;
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#define MDB_EVT_DATA_MST_PER 0xFF
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#define MDB_EVT_DATA_PER_MST 0xFE
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#define MDB_EVT_BUS_RESET 0xFD
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static const value_string mdb_event[] = {
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{ MDB_EVT_DATA_MST_PER, "Data transfer Master -> Peripheral" },
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{ MDB_EVT_DATA_PER_MST, "Data transfer Peripheral -> Master" },
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{ MDB_EVT_BUS_RESET, "Bus reset" },
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{ 0, NULL }
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};
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#define ADDR_VMC "VMC"
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#define ADDR_CASHLESS1 0x10
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#define ADDR_COMMS_GW 0x18
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static const value_string mdb_addr[] = {
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{ 0x08, "Changer" },
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{ ADDR_CASHLESS1, "Cashless #1" },
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{ ADDR_COMMS_GW, "Communications Gateway" },
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{ 0x30, "Bill Validator" },
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{ 0x60, "Cashless #2" },
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{ 0x68, "Age Verification Device" },
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{ 0, NULL }
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};
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static const value_string mdb_ack[] = {
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{ 0x00, "ACK" },
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{ 0xAA, "RET" },
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{ 0xFF, "NAK" },
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{ 0, NULL }
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};
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/*
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* These are just the command bits in the address + command byte. MDB supports
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* two Cashless peripherals (Cashless #1 and #2) with different addresses,
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* both use the same commands.
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*/
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#define MDB_CL_CMD_SETUP 0x01
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#define MDB_CL_CMD_VEND 0x03
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#define MDB_CL_CMD_READER 0x04
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#define MDB_CL_CMD_EXPNS 0x07
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static const value_string mdb_cl_cmd[] = {
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{ 0x00, "Reset" },
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{ MDB_CL_CMD_SETUP, "Setup" },
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{ 0x02, "Poll" },
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{ MDB_CL_CMD_VEND, "Vend" },
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{ MDB_CL_CMD_READER, "Reader" },
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{ MDB_CL_CMD_EXPNS, "Expansion" },
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{ 0, NULL }
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};
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#define MDB_CL_SETUP_CFG_DATA 0x00
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#define MDB_CL_SETUP_MAX_MIN 0x01
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static const value_string mdb_cl_setup_sub_cmd[] = {
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{ MDB_CL_SETUP_CFG_DATA, "Config Data" },
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{ MDB_CL_SETUP_MAX_MIN, "Max/Min Prices" },
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{ 0, NULL }
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};
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#define MDB_CL_VEND_REQ 0x00
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#define MDB_CL_VEND_SUC 0x02
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static const value_string mdb_cl_vend_sub_cmd[] = {
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{ MDB_CL_VEND_REQ, "Vend Request" },
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{ MDB_CL_VEND_SUC, "Vend Success" },
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{ 0x04, "Session Complete" },
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{ 0, NULL }
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};
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static const value_string mdb_cl_reader_sub_cmd[] = {
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{ 0x00, "Reader Disable" },
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{ 0x01, "Reader Enable" },
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{ 0, NULL }
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};
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#define MDB_CL_EXPNS_REQ_ID 0x00
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#define MDB_CL_EXPNS_OPT_ENA 0x04
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static const value_string mdb_cl_expns_sub_cmd[] = {
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{ MDB_CL_EXPNS_REQ_ID, "Request ID" },
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{ MDB_CL_EXPNS_OPT_ENA, "Optional Feature Enabled" },
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{ 0, NULL }
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};
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#define MDB_CL_RESP_RD_CFG_DATA 0x01
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#define MDB_CL_RESP_VEND_APRV 0x05
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#define MDB_CL_RESP_PER_ID 0x09
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static const value_string mdb_cl_resp[] = {
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{ 0x00, "Just Reset" },
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{ MDB_CL_RESP_RD_CFG_DATA, "Reader Config Data" },
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{ 0x03, "Begin Session" },
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{ MDB_CL_RESP_VEND_APRV, "Vend Approved" },
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{ 0x06, "Vend Denied" },
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{ 0x07, "End Session" },
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{ MDB_CL_RESP_PER_ID, "Peripheral ID" },
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{ 0x0b, "Cmd Out Of Sequence" },
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{ 0, NULL }
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};
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/*
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* For the Communications Gateway, we use the complete address + command byte
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* as value for the value string. The values here match those in the MDB
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* specification.
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*
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* There's only one Communications Gateway, the address bits are always the
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* same. (This is different from the Cashless peripherals, see above.)
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*/
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#define MDB_CGW_ADDR_CMD_SETUP 0x19
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#define MDB_CGW_ADDR_CMD_REPORT 0x1B
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#define MDB_CGW_ADDR_CMD_EXPNS 0x1F
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static const value_string mdb_cgw_addr_cmd[] = {
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{ 0x18, "Reset" },
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{ MDB_CGW_ADDR_CMD_SETUP, "Setup" },
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{ 0x1A, "Poll" },
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{ MDB_CGW_ADDR_CMD_REPORT, "Report" },
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{ MDB_CGW_ADDR_CMD_EXPNS, "Expansion" },
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{ 0, NULL }
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};
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#define MDB_CGW_REPORT_DTS_EVT 0x02
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static const value_string mdb_cgw_report_sub_cmd[] = {
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{ 0x01, "Transaction" },
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{ MDB_CGW_REPORT_DTS_EVT, "DTS Event" },
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{ 0, NULL }
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};
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#define MDB_CGW_EXPNS_FEAT_ENA 0x01
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static const value_string mdb_cgw_expns_sub_cmd[] = {
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{ 0x00, "Identification" },
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{ MDB_CGW_EXPNS_FEAT_ENA, "Feature enable" },
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{ 0x02, "Time/Date Request" },
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{ 0, NULL }
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};
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#define MDB_CGW_RESP_CFG 0x01
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#define MDB_CGW_RESP_PER_ID 0x06
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static const value_string mdb_cgw_resp[] = {
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{ 0x00, "Just Reset" },
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{ MDB_CGW_RESP_CFG, "Comms Gateway Config" },
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{ 0x05, "DTS Event Acknowledge" },
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{ MDB_CGW_RESP_PER_ID, "Peripheral ID" },
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{ 0, NULL }
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};
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static void dissect_mdb_ack(tvbuff_t *tvb, gint offset,
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packet_info *pinfo, proto_tree *tree)
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{
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guint32 ack;
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proto_tree_add_item_ret_uint(tree, hf_mdb_ack, tvb, offset, 1,
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ENC_BIG_ENDIAN, &ack);
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col_set_str(pinfo->cinfo, COL_INFO,
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val_to_str_const(ack, mdb_ack, "Invalid ack byte"));
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}
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static void mdb_set_addrs(guint8 event, guint8 addr, packet_info *pinfo)
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{
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const char *periph = val_to_str(addr, mdb_addr, "Unknown (0x%02x)");
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/* pinfo->p2p_dir is from the perspective of the master (VMC) */
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if (event == MDB_EVT_DATA_MST_PER) {
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set_address(&pinfo->src, AT_STRINGZ, (int)strlen(ADDR_VMC)+1, ADDR_VMC);
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set_address(&pinfo->dst, AT_STRINGZ, (int)strlen(periph)+1, periph);
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pinfo->p2p_dir = P2P_DIR_SENT;
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}
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else if (event == MDB_EVT_DATA_PER_MST) {
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set_address(&pinfo->src, AT_STRINGZ, (int)strlen(periph)+1, periph);
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set_address(&pinfo->dst, AT_STRINGZ, (int)strlen(ADDR_VMC)+1, ADDR_VMC);
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pinfo->p2p_dir = P2P_DIR_RECV;
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}
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}
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static void dissect_mdb_cl_setup(tvbuff_t *tvb, gint offset,
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packet_info *pinfo, proto_tree *tree)
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{
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guint32 sub_cmd, price;
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const gchar *s;
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proto_item *pi;
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proto_tree_add_item_ret_uint(tree, hf_mdb_cl_setup_sub,
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tvb, offset, 1, ENC_BIG_ENDIAN, &sub_cmd);
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s = try_val_to_str(sub_cmd, mdb_cl_setup_sub_cmd);
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if (s) {
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col_set_str(pinfo->cinfo, COL_INFO, s);
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}
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offset++;
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switch (sub_cmd) {
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case MDB_CL_SETUP_CFG_DATA:
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proto_tree_add_item(tree, hf_mdb_cl_feat_lvl, tvb, offset, 1,
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ENC_BIG_ENDIAN);
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offset++;
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proto_tree_add_item(tree, hf_mdb_cl_cols, tvb, offset, 1,
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ENC_BIG_ENDIAN);
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offset++;
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proto_tree_add_item(tree, hf_mdb_cl_rows, tvb, offset, 1,
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ENC_BIG_ENDIAN);
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offset++;
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proto_tree_add_item(tree, hf_mdb_cl_disp_info, tvb, offset, 1,
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ENC_BIG_ENDIAN);
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break;
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case MDB_CL_SETUP_MAX_MIN:
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if (tvb_reported_length_remaining(tvb, offset) == 5) {
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/* This is the "default version" of Max/Min Prices. */
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/* XXX - convert the scaled prices into actual amounts */
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price = tvb_get_ntohs(tvb, offset);
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pi = proto_tree_add_uint_format(tree, hf_mdb_cl_max_price,
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tvb, offset, 2, price, "Maximum price: 0x%04x", price);
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if (price == 0xFFFF) {
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proto_item_append_text(pi, " (unknown)");
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}
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offset += 2;
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price = tvb_get_ntohs(tvb, offset);
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pi = proto_tree_add_uint_format(tree, hf_mdb_cl_min_price,
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tvb, offset, 2, price, "Minimum price: 0x%04x", price);
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if (price == 0x0000) {
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proto_item_append_text(pi, " (unknown)");
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}
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}
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else if (tvb_reported_length_remaining(tvb, offset) == 11) {
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/* This is the "expanded currency version" of Max/Min Prices. */
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proto_tree_add_item(tree, hf_mdb_cl_max_price, tvb, offset, 4,
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ENC_BIG_ENDIAN);
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offset += 4;
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proto_tree_add_item(tree, hf_mdb_cl_min_price, tvb, offset, 4,
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ENC_BIG_ENDIAN);
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}
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/* XXX - expert info for other lengths */
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break;
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}
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}
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static void dissect_mdb_cl_vend(tvbuff_t *tvb, gint offset,
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packet_info *pinfo, proto_tree *tree)
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{
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guint32 sub_cmd, price, item;
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const gchar *s;
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proto_tree_add_item_ret_uint(tree, hf_mdb_cl_vend_sub, tvb, offset, 1,
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ENC_BIG_ENDIAN, &sub_cmd);
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s = try_val_to_str(sub_cmd, mdb_cl_vend_sub_cmd);
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if (s) {
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col_set_str(pinfo->cinfo, COL_INFO, s);
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}
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offset++;
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switch (sub_cmd) {
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case MDB_CL_VEND_REQ:
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if (tvb_reported_length_remaining(tvb, offset) == 5) {
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proto_tree_add_item_ret_uint(tree, hf_mdb_cl_item_price, tvb,
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offset, 2, ENC_BIG_ENDIAN, &price);
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offset += 2;
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proto_tree_add_item_ret_uint(tree, hf_mdb_cl_item_num, tvb,
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offset, 2, ENC_BIG_ENDIAN, &item);
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col_append_fstr(pinfo->cinfo, COL_INFO, " (item %d, price %d)",
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item, price);
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}
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/* XXX - dissect the longer request in Expanded Currency Mode */
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break;
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case MDB_CL_VEND_SUC:
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proto_tree_add_item(tree, hf_mdb_cl_item_num, tvb, offset, 2,
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ENC_BIG_ENDIAN);
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break;
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}
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}
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static gint
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dissect_mdb_cl_id_fields(tvbuff_t *tvb, gint offset, proto_tree *tree)
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{
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proto_tree_add_item(tree, hf_mdb_cl_manuf_code, tvb, offset, 3, ENC_ASCII);
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offset += 3;
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proto_tree_add_item(tree, hf_mdb_cl_ser_num, tvb, offset, 12, ENC_ASCII);
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offset += 12;
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proto_tree_add_item(tree, hf_mdb_cl_mod_num, tvb, offset, 12, ENC_ASCII);
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offset += 12;
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/* XXX - dissect the Software Version bytes */
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offset += 2;
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return offset;
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}
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static void dissect_mdb_cl_expns(tvbuff_t *tvb, gint offset, packet_info *pinfo,
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proto_tree *tree)
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{
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guint32 sub_cmd;
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const gchar *s;
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proto_tree_add_item_ret_uint(tree, hf_mdb_cl_expns_sub,
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tvb, offset, 1, ENC_BIG_ENDIAN, &sub_cmd);
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s = try_val_to_str(sub_cmd, mdb_cl_expns_sub_cmd);
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if (s) {
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col_set_str(pinfo->cinfo, COL_INFO, s);
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}
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offset++;
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switch (sub_cmd) {
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case MDB_CL_EXPNS_REQ_ID:
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dissect_mdb_cl_id_fields(tvb, offset, tree);
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break;
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case MDB_CL_EXPNS_OPT_ENA:
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/* XXX - add a bitmask for the Optional Feature Bits */
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proto_tree_add_item(tree, hf_mdb_cl_opt_feat, tvb, offset, 4,
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ENC_BIG_ENDIAN);
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break;
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}
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}
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static void dissect_mdb_cl_rd_cfg_data(tvbuff_t *tvb, gint offset,
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packet_info *pinfo _U_, proto_tree *tree)
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{
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proto_tree_add_item(tree, hf_mdb_cl_feat_lvl, tvb, offset, 1,
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ENC_BIG_ENDIAN);
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offset++;
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/* XXX - dissect Country/Currency Code */
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offset += 2;
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proto_tree_add_item(tree, hf_mdb_cl_scale, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset++;
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proto_tree_add_item(tree, hf_mdb_cl_dec_pl, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset++;
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proto_tree_add_item(tree, hf_mdb_cl_max_rsp_time, tvb, offset, 1,
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ENC_TIME_SECS | ENC_BIG_ENDIAN);
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}
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static void dissect_mdb_mst_per_cl( tvbuff_t *tvb, gint offset, gint len _U_,
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packet_info *pinfo, proto_tree *tree, proto_item *cmd_it,
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guint8 addr_byte)
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{
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guint8 cmd = addr_byte & 0x07; /* the 3-bit command */
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proto_tree *cl_tree;
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guint32 sub_cmd;
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const gchar *s;
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s = val_to_str_const(cmd, mdb_cl_cmd, "Unknown");
|
|
proto_item_append_text(cmd_it, " (%s)", s);
|
|
col_set_str(pinfo->cinfo, COL_INFO, s);
|
|
|
|
cl_tree = proto_tree_add_subtree(tree, tvb, offset, len, ett_mdb_cl,
|
|
NULL, "Cashless");
|
|
|
|
s = NULL;
|
|
switch (cmd) {
|
|
case MDB_CL_CMD_SETUP:
|
|
dissect_mdb_cl_setup(tvb, offset, pinfo, cl_tree);
|
|
break;
|
|
case MDB_CL_CMD_VEND:
|
|
dissect_mdb_cl_vend(tvb, offset, pinfo, cl_tree);
|
|
break;
|
|
case MDB_CL_CMD_READER:
|
|
proto_tree_add_item_ret_uint(cl_tree, hf_mdb_cl_reader_sub,
|
|
tvb, offset, 1, ENC_BIG_ENDIAN, &sub_cmd);
|
|
s = try_val_to_str(sub_cmd, mdb_cl_reader_sub_cmd);
|
|
break;
|
|
case MDB_CL_CMD_EXPNS:
|
|
dissect_mdb_cl_expns(tvb, offset, pinfo, cl_tree);
|
|
break;
|
|
}
|
|
if (s)
|
|
col_set_str(pinfo->cinfo, COL_INFO, s);
|
|
}
|
|
|
|
static void dissect_mdb_per_mst_cl( tvbuff_t *tvb, gint offset,
|
|
gint len _U_, packet_info *pinfo, proto_tree *tree)
|
|
{
|
|
proto_tree *cl_tree;
|
|
guint32 cl_resp;
|
|
|
|
cl_tree = proto_tree_add_subtree(tree, tvb, offset, len, ett_mdb_cl,
|
|
NULL, "Cashless");
|
|
|
|
proto_tree_add_item_ret_uint(cl_tree, hf_mdb_cl_resp, tvb, offset, 1,
|
|
ENC_BIG_ENDIAN, &cl_resp);
|
|
col_set_str(pinfo->cinfo,
|
|
COL_INFO, val_to_str_const(cl_resp, mdb_cl_resp, "Unknown"));
|
|
offset++;
|
|
|
|
switch (cl_resp) {
|
|
case MDB_CL_RESP_RD_CFG_DATA:
|
|
dissect_mdb_cl_rd_cfg_data(tvb, offset, pinfo, cl_tree);
|
|
break;
|
|
case MDB_CL_RESP_VEND_APRV:
|
|
if (tvb_reported_length_remaining(tvb, offset) == 3) {
|
|
proto_tree_add_item(cl_tree, hf_mdb_cl_vend_amt, tvb, offset,
|
|
2, ENC_BIG_ENDIAN);
|
|
}
|
|
/* XXX - dissect the longer response in Expanded Currency Mode */
|
|
break;
|
|
case MDB_CL_RESP_PER_ID:
|
|
dissect_mdb_cl_id_fields(tvb, offset, tree);
|
|
/* XXX - check if we have Optional Feature Bits */
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void dissect_mdb_cgw_report(tvbuff_t *tvb, gint offset,
|
|
packet_info *pinfo, proto_tree *tree)
|
|
{
|
|
guint32 sub_cmd;
|
|
const gchar *s;
|
|
|
|
proto_tree_add_item_ret_uint(tree, hf_mdb_cgw_report_sub,
|
|
tvb, offset, 1, ENC_BIG_ENDIAN, &sub_cmd);
|
|
s = try_val_to_str(sub_cmd, mdb_cgw_report_sub_cmd);
|
|
if (s) {
|
|
col_set_str(pinfo->cinfo, COL_INFO, s);
|
|
}
|
|
offset++;
|
|
|
|
switch (sub_cmd) {
|
|
case MDB_CGW_REPORT_DTS_EVT:
|
|
proto_tree_add_item(tree, hf_mdb_cgw_dts_evt_code, tvb, offset, 10,
|
|
ENC_ASCII);
|
|
offset += 10;
|
|
/* XXX - dissect Date */
|
|
offset += 4;
|
|
/* XXX - dissect Time */
|
|
offset += 2;
|
|
proto_tree_add_item(tree, hf_mdb_cgw_duration, tvb, offset, 4,
|
|
ENC_BIG_ENDIAN);
|
|
offset += 4;
|
|
proto_tree_add_item(tree, hf_mdb_cgw_activity, tvb, offset, 1,
|
|
ENC_BIG_ENDIAN);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void dissect_mdb_cgw_expns(tvbuff_t *tvb, gint offset,
|
|
packet_info *pinfo, proto_tree *tree)
|
|
{
|
|
guint32 sub_cmd;
|
|
const gchar *s;
|
|
|
|
proto_tree_add_item_ret_uint(tree, hf_mdb_cgw_expns_sub,
|
|
tvb, offset, 1, ENC_BIG_ENDIAN, &sub_cmd);
|
|
s = try_val_to_str(sub_cmd, mdb_cgw_expns_sub_cmd);
|
|
if (s) {
|
|
col_set_str(pinfo->cinfo, COL_INFO, s);
|
|
}
|
|
offset++;
|
|
|
|
switch (sub_cmd) {
|
|
case MDB_CGW_EXPNS_FEAT_ENA:
|
|
proto_tree_add_item(tree, hf_mdb_cgw_opt_feat, tvb, offset, 4,
|
|
ENC_BIG_ENDIAN);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void dissect_mdb_mst_per_cgw( tvbuff_t *tvb, gint offset, gint len,
|
|
packet_info *pinfo, proto_tree *tree, proto_item *cmd_it,
|
|
guint8 addr_cmd_byte)
|
|
{
|
|
proto_tree *cgw_tree;
|
|
const gchar *s;
|
|
|
|
s = val_to_str_const(addr_cmd_byte, mdb_cgw_addr_cmd, "Unknown");
|
|
proto_item_append_text(cmd_it, " (%s)", s);
|
|
col_set_str(pinfo->cinfo, COL_INFO, s);
|
|
|
|
cgw_tree = proto_tree_add_subtree(tree, tvb, offset, len, ett_mdb_cgw,
|
|
NULL, "Communications Gateway");
|
|
|
|
switch (addr_cmd_byte) {
|
|
case MDB_CGW_ADDR_CMD_SETUP:
|
|
proto_tree_add_item(cgw_tree, hf_mdb_cgw_feat_lvl, tvb, offset, 1,
|
|
ENC_BIG_ENDIAN);
|
|
offset++;
|
|
proto_tree_add_item(cgw_tree, hf_mdb_cgw_scale, tvb, offset, 1,
|
|
ENC_BIG_ENDIAN);
|
|
offset++;
|
|
proto_tree_add_item(cgw_tree, hf_mdb_cgw_dec_pl, tvb, offset, 1,
|
|
ENC_BIG_ENDIAN);
|
|
break;
|
|
case MDB_CGW_ADDR_CMD_REPORT:
|
|
dissect_mdb_cgw_report(tvb, offset, pinfo, cgw_tree);
|
|
break;
|
|
case MDB_CGW_ADDR_CMD_EXPNS:
|
|
dissect_mdb_cgw_expns(tvb, offset, pinfo, cgw_tree);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void dissect_mdb_per_mst_cgw( tvbuff_t *tvb, gint offset,
|
|
gint len, packet_info *pinfo _U_, proto_tree *tree)
|
|
{
|
|
proto_tree *cgw_tree;
|
|
guint32 cgw_resp;
|
|
|
|
cgw_tree = proto_tree_add_subtree(tree, tvb, offset, len, ett_mdb_cgw,
|
|
NULL, "Communications Gateway");
|
|
|
|
proto_tree_add_item_ret_uint(cgw_tree, hf_mdb_cgw_resp, tvb, offset, 1,
|
|
ENC_BIG_ENDIAN, &cgw_resp);
|
|
col_set_str(pinfo->cinfo,
|
|
COL_INFO, val_to_str_const(cgw_resp, mdb_cgw_resp, "Unknown"));
|
|
offset++;
|
|
|
|
switch (cgw_resp) {
|
|
case MDB_CGW_RESP_CFG:
|
|
proto_tree_add_item(cgw_tree, hf_mdb_cgw_feat_lvl, tvb, offset, 1,
|
|
ENC_BIG_ENDIAN);
|
|
offset++;
|
|
proto_tree_add_item(cgw_tree, hf_mdb_cgw_max_rsp_time, tvb, offset,
|
|
2, ENC_TIME_SECS | ENC_BIG_ENDIAN);
|
|
break;
|
|
case MDB_CGW_RESP_PER_ID:
|
|
proto_tree_add_item(tree, hf_mdb_cgw_manuf_code, tvb, offset, 3,
|
|
ENC_ASCII);
|
|
offset += 3;
|
|
proto_tree_add_item(tree, hf_mdb_cgw_ser_num, tvb, offset, 12,
|
|
ENC_ASCII);
|
|
offset += 12;
|
|
proto_tree_add_item(tree, hf_mdb_cgw_mod_num, tvb, offset, 12,
|
|
ENC_ASCII);
|
|
offset += 12;
|
|
/* XXX - dissect the Software Version bytes */
|
|
offset += 2;
|
|
proto_tree_add_item(tree, hf_mdb_cgw_opt_feat, tvb, offset, 4,
|
|
ENC_BIG_ENDIAN);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void dissect_mdb_mst_per(tvbuff_t *tvb, gint offset, packet_info *pinfo,
|
|
proto_tree *tree)
|
|
{
|
|
guint8 addr_byte, addr;
|
|
gint mst_per_len;
|
|
guint data_len;
|
|
proto_item *cmd_it;
|
|
|
|
mst_per_len = tvb_reported_length_remaining(tvb, offset);
|
|
if (mst_per_len <= 0) {
|
|
expert_add_info(pinfo, tree, &ei_mdb_short_packet);
|
|
return;
|
|
}
|
|
|
|
if (mst_per_len == 1) {
|
|
dissect_mdb_ack(tvb, offset, pinfo, tree);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Our packet has one address byte, an optional data block and one
|
|
* checksum byte.
|
|
*/
|
|
|
|
data_len = mst_per_len - 2;
|
|
|
|
/*
|
|
* The address byte is 5-bit address | 3-bit command.
|
|
*
|
|
* The specification uses 8-bit addresses which are the address byte
|
|
* with the three lowest bits set to 0.
|
|
*
|
|
* The commands are defined as the complete address byte (i.e. they
|
|
* include the address part). This does not make much sense: Cashless #1
|
|
* and #2 have different addresses but exactly the same 3-bit commands.
|
|
*
|
|
* In this dissector, we try to use the same values as the specification.
|
|
*/
|
|
addr_byte = tvb_get_guint8(tvb, offset);
|
|
addr = addr_byte & 0xF8;
|
|
proto_tree_add_uint_bits_format_value(tree, hf_mdb_addr,
|
|
tvb, 8*offset, 5, addr, ENC_BIG_ENDIAN, "0x%02x", addr);
|
|
cmd_it = proto_tree_add_uint(tree, hf_mdb_cmd, tvb, offset, 1, addr_byte);
|
|
mdb_set_addrs(MDB_EVT_DATA_MST_PER, addr, pinfo);
|
|
offset++;
|
|
|
|
/*
|
|
* We call the peripheral functions even if data_len == 0 so they can fix
|
|
* up the command with peripheral-specific info.
|
|
*/
|
|
switch (addr) {
|
|
case ADDR_CASHLESS1:
|
|
dissect_mdb_mst_per_cl(tvb, offset, data_len, pinfo, tree,
|
|
cmd_it, addr_byte);
|
|
break;
|
|
case ADDR_COMMS_GW:
|
|
dissect_mdb_mst_per_cgw(tvb, offset, data_len, pinfo, tree,
|
|
cmd_it, addr_byte);
|
|
break;
|
|
default:
|
|
if (data_len > 0) {
|
|
proto_tree_add_item(tree, hf_mdb_data,
|
|
tvb, offset, data_len, ENC_NA);
|
|
}
|
|
break;
|
|
}
|
|
offset += data_len;
|
|
|
|
/* XXX - verify the checksum */
|
|
proto_tree_add_item(tree, hf_mdb_chk, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
}
|
|
|
|
static void dissect_mdb_per_mst(tvbuff_t *tvb, gint offset, packet_info *pinfo,
|
|
proto_tree *tree, guint8 addr)
|
|
{
|
|
gint per_mst_len;
|
|
guint data_len;
|
|
|
|
/*
|
|
* A packet from peripheral to master is either a single ACK/NAK byte or
|
|
* a non-empty data block followed by one checksum byte.
|
|
*/
|
|
|
|
per_mst_len = tvb_reported_length_remaining(tvb, offset);
|
|
if (per_mst_len <= 0) {
|
|
expert_add_info(pinfo, tree, &ei_mdb_short_packet);
|
|
return;
|
|
}
|
|
|
|
if (per_mst_len == 1) {
|
|
dissect_mdb_ack(tvb, offset, pinfo, tree);
|
|
return;
|
|
}
|
|
|
|
data_len = per_mst_len - 1;
|
|
switch (addr) {
|
|
case ADDR_CASHLESS1:
|
|
dissect_mdb_per_mst_cl(tvb, offset, data_len, pinfo, tree);
|
|
break;
|
|
case ADDR_COMMS_GW:
|
|
dissect_mdb_per_mst_cgw(tvb, offset, data_len, pinfo, tree);
|
|
break;
|
|
default:
|
|
proto_tree_add_item(tree, hf_mdb_data, tvb, offset, data_len, ENC_NA);
|
|
break;
|
|
}
|
|
offset += data_len;
|
|
|
|
/* XXX - verify the checksum */
|
|
proto_tree_add_item(tree, hf_mdb_chk, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
}
|
|
|
|
static int dissect_mdb(tvbuff_t *tvb,
|
|
packet_info *pinfo, proto_tree *tree, void *data _U_)
|
|
{
|
|
gint offset = 0, offset_ver, offset_evt;
|
|
guint8 version, event, addr;
|
|
proto_tree *mdb_tree, *hdr_tree;
|
|
proto_item *tree_ti, *hdr_ti;
|
|
|
|
/* We need at least the shortest possible pseudo header. */
|
|
if (tvb_captured_length(tvb) < 3)
|
|
return 0;
|
|
|
|
offset_ver = offset;
|
|
version = tvb_get_guint8(tvb, offset++);
|
|
if (version != 0)
|
|
return 0;
|
|
|
|
offset_evt = offset;
|
|
event = tvb_get_guint8(tvb, offset++);
|
|
if (!try_val_to_str(event, mdb_event))
|
|
return 0;
|
|
|
|
col_set_str(pinfo->cinfo, COL_PROTOCOL, "MDB");
|
|
col_clear(pinfo->cinfo, COL_INFO);
|
|
|
|
tree_ti = proto_tree_add_protocol_format(tree, proto_mdb,
|
|
tvb, 0, tvb_reported_length(tvb), "MDB");
|
|
mdb_tree = proto_item_add_subtree(tree_ti, ett_mdb);
|
|
|
|
hdr_tree = proto_tree_add_subtree(mdb_tree, tvb, 0, -1, ett_mdb_hdr,
|
|
&hdr_ti, "Pseudo header");
|
|
|
|
proto_tree_add_item(hdr_tree, hf_mdb_hdr_ver,
|
|
tvb, offset_ver, 1, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item(hdr_tree, hf_mdb_event,
|
|
tvb, offset_evt, 1, ENC_BIG_ENDIAN);
|
|
|
|
/* Packets from peripheral to master always have an address byte in their
|
|
pseudo header. */
|
|
if (event == MDB_EVT_DATA_PER_MST) {
|
|
/* See the comment in dissect_mdb_mst_per about MDB addresses. */
|
|
addr = tvb_get_guint8(tvb, offset) & 0xF8;
|
|
proto_tree_add_uint_bits_format_value(hdr_tree, hf_mdb_addr,
|
|
tvb, 8*offset, 5, addr, ENC_BIG_ENDIAN, "0x%02x", addr);
|
|
offset++;
|
|
mdb_set_addrs(event, addr, pinfo);
|
|
}
|
|
|
|
/* We're now at the end of the pseudo header. */
|
|
proto_item_set_len(hdr_ti, offset);
|
|
|
|
if (event == MDB_EVT_BUS_RESET)
|
|
return offset;
|
|
|
|
if (event == MDB_EVT_DATA_MST_PER)
|
|
dissect_mdb_mst_per(tvb, offset, pinfo, mdb_tree);
|
|
else if (event == MDB_EVT_DATA_PER_MST)
|
|
dissect_mdb_per_mst(tvb, offset, pinfo, mdb_tree, addr);
|
|
|
|
return tvb_reported_length(tvb);
|
|
}
|
|
|
|
void proto_register_mdb(void)
|
|
{
|
|
expert_module_t* expert_mdb;
|
|
|
|
static gint *ett[] = {
|
|
&ett_mdb,
|
|
&ett_mdb_hdr,
|
|
&ett_mdb_cl,
|
|
&ett_mdb_cgw
|
|
};
|
|
|
|
static hf_register_info hf[] = {
|
|
{ &hf_mdb_hdr_ver,
|
|
{ "Version", "mdb.hdr_ver",
|
|
FT_UINT8, BASE_HEX, NULL, 0, NULL, HFILL }
|
|
},
|
|
{ &hf_mdb_event,
|
|
{ "Event", "mdb.event",
|
|
FT_UINT8, BASE_HEX, VALS(mdb_event), 0, NULL, HFILL }
|
|
},
|
|
{ &hf_mdb_addr,
|
|
{ "Address", "mdb.addr",
|
|
FT_UINT8, BASE_HEX, NULL, 0, NULL, HFILL }
|
|
},
|
|
{ &hf_mdb_cmd,
|
|
{ "Command", "mdb.cmd",
|
|
FT_UINT8, BASE_HEX, NULL, 0, NULL, HFILL }
|
|
},
|
|
{ &hf_mdb_cl_setup_sub,
|
|
{ "Sub-command", "mdb.cashless.setup_sub_cmd",
|
|
FT_UINT8, BASE_HEX, VALS(mdb_cl_setup_sub_cmd), 0, NULL, HFILL }
|
|
},
|
|
{ &hf_mdb_cl_feat_lvl,
|
|
{ "Feature level", "mdb.cashless.feature_level",
|
|
FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL }
|
|
},
|
|
{ &hf_mdb_cl_cols,
|
|
{ "Columns on display", "mdb.cashless.columns",
|
|
FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL }
|
|
},
|
|
{ &hf_mdb_cl_rows,
|
|
{ "Rows on display", "mdb.cashless.rows",
|
|
FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL }
|
|
},
|
|
{ &hf_mdb_cl_disp_info,
|
|
{ "Display information", "mdb.cashless.disp_info",
|
|
FT_UINT8, BASE_HEX, NULL, 0x07, NULL, HFILL }
|
|
},
|
|
{ &hf_mdb_cl_max_price,
|
|
{ "Maximum price", "mdb.cashless.max_price",
|
|
FT_UINT32, BASE_HEX, NULL, 0, NULL, HFILL }
|
|
},
|
|
{ &hf_mdb_cl_min_price,
|
|
{ "Minimum price", "mdb.cashless.min_price",
|
|
FT_UINT32, BASE_HEX, NULL, 0, NULL, HFILL }
|
|
},
|
|
{ &hf_mdb_cl_vend_sub,
|
|
{ "Sub-command", "mdb.cashless.vend_sub_cmd",
|
|
FT_UINT8, BASE_HEX, VALS(mdb_cl_vend_sub_cmd), 0, NULL, HFILL }
|
|
},
|
|
{ &hf_mdb_cl_item_price,
|
|
{ "Item Price", "mdb.cashless.item_price",
|
|
FT_UINT32, BASE_DEC, NULL, 0, NULL, HFILL }
|
|
},
|
|
{ &hf_mdb_cl_item_num,
|
|
{ "Item Number", "mdb.cashless.item_number",
|
|
FT_UINT32, BASE_DEC, NULL, 0, NULL, HFILL }
|
|
},
|
|
{ &hf_mdb_cl_reader_sub,
|
|
{ "Sub-command", "mdb.cashless.reader_sub_cmd",
|
|
FT_UINT8, BASE_HEX, VALS(mdb_cl_reader_sub_cmd), 0, NULL, HFILL }
|
|
},
|
|
{ &hf_mdb_cl_resp,
|
|
{ "Response", "mdb.cashless.resp",
|
|
FT_UINT8, BASE_HEX, VALS(mdb_cl_resp), 0, NULL, HFILL }
|
|
},
|
|
{ &hf_mdb_cl_scale,
|
|
{ "Scale factor", "mdb.cashless.scale_factor",
|
|
FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL }
|
|
},
|
|
{ &hf_mdb_cl_dec_pl,
|
|
{ "Decimal places", "mdb.cashless.decimal_places",
|
|
FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL }
|
|
},
|
|
{ &hf_mdb_cl_max_rsp_time,
|
|
{ "Application maximum response time", "mdb.cashless.max_rsp_time",
|
|
FT_RELATIVE_TIME, BASE_NONE, NULL, 0, NULL, HFILL }
|
|
},
|
|
{ &hf_mdb_cl_vend_amt,
|
|
{ "Vend Amount", "mdb.cashless.vend_amount",
|
|
FT_UINT32, BASE_DEC, NULL, 0, NULL, HFILL }
|
|
},
|
|
{ &hf_mdb_cl_expns_sub,
|
|
{ "Sub-command", "mdb.cashless.expansion_sub_cmd",
|
|
FT_UINT8, BASE_HEX, VALS(mdb_cl_expns_sub_cmd), 0, NULL, HFILL }
|
|
},
|
|
{ &hf_mdb_cl_manuf_code,
|
|
{ "Manufacturer Code", "mdb.cashless.manuf_code",
|
|
FT_STRING, BASE_NONE, NULL, 0, NULL, HFILL }
|
|
},
|
|
{ &hf_mdb_cl_ser_num,
|
|
{ "Serial Number", "mdb.cashless.serial_number",
|
|
FT_STRING, BASE_NONE, NULL, 0, NULL, HFILL }
|
|
},
|
|
{ &hf_mdb_cl_mod_num,
|
|
{ "Model Number", "mdb.cashless.model_number",
|
|
FT_STRING, BASE_NONE, NULL, 0, NULL, HFILL }
|
|
},
|
|
{ &hf_mdb_cl_opt_feat,
|
|
{ "Optional Feature Bits", "mdb.cashless.opt_feature_bits",
|
|
FT_UINT32, BASE_HEX, NULL, 0, NULL, HFILL }
|
|
},
|
|
{ &hf_mdb_cgw_feat_lvl,
|
|
{ "Feature level", "mdb.comms_gw.feature_level",
|
|
FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL }
|
|
},
|
|
{ &hf_mdb_cgw_scale,
|
|
{ "Scale factor", "mdb.comms_gw.scale_factor",
|
|
FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL }
|
|
},
|
|
{ &hf_mdb_cgw_dec_pl,
|
|
{ "Decimal places", "mdb.comms_gw.decimal_places",
|
|
FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL }
|
|
},
|
|
{ &hf_mdb_cgw_resp,
|
|
{ "Response", "mdb.comms_gw.resp",
|
|
FT_UINT8, BASE_HEX, VALS(mdb_cgw_resp), 0, NULL, HFILL }
|
|
},
|
|
{ &hf_mdb_cgw_max_rsp_time,
|
|
{ "Application maximum response time", "mdb.comms_gw.max_rsp_time",
|
|
FT_RELATIVE_TIME, BASE_NONE, NULL, 0, NULL, HFILL }
|
|
},
|
|
{ &hf_mdb_cgw_report_sub,
|
|
{ "Sub-command", "mdb.comms_gw.report_sub_cmd", FT_UINT8,
|
|
BASE_HEX, VALS(mdb_cgw_report_sub_cmd), 0, NULL, HFILL }
|
|
},
|
|
{ &hf_mdb_cgw_dts_evt_code,
|
|
{ "DTS Event Code", "mdb.comms_gw.dts_event_code",
|
|
FT_STRING, BASE_NONE, NULL, 0, NULL, HFILL }
|
|
},
|
|
{ &hf_mdb_cgw_duration,
|
|
{ "Duration", "mdb.comms_gw.duration",
|
|
FT_UINT32, BASE_DEC, NULL, 0, NULL, HFILL }
|
|
},
|
|
{ &hf_mdb_cgw_activity,
|
|
{ "Activity", "mdb.comms_gw.activity",
|
|
FT_BOOLEAN, 8, TFS(&tfs_active_inactive), 0x1, NULL, HFILL }
|
|
},
|
|
{ &hf_mdb_cgw_expns_sub,
|
|
{ "Sub-command", "mdb.comms_gw.expansion_sub_cmd", FT_UINT8,
|
|
BASE_HEX, VALS(mdb_cgw_expns_sub_cmd), 0, NULL, HFILL }
|
|
},
|
|
{ &hf_mdb_cgw_opt_feat,
|
|
{ "Optional Feature Bits", "mdb.comms_gw.opt_feature_bits",
|
|
FT_UINT32, BASE_HEX, NULL, 0, NULL, HFILL }
|
|
},
|
|
{ &hf_mdb_cgw_manuf_code,
|
|
{ "Manufacturer Code", "mdb.comms_gw.manuf_code",
|
|
FT_STRING, BASE_NONE, NULL, 0, NULL, HFILL }
|
|
},
|
|
{ &hf_mdb_cgw_ser_num,
|
|
{ "Serial Number", "mdb.comms_gw.serial_number",
|
|
FT_STRING, BASE_NONE, NULL, 0, NULL, HFILL }
|
|
},
|
|
{ &hf_mdb_cgw_mod_num,
|
|
{ "Model Number", "mdb.comms_gw.model_number",
|
|
FT_STRING, BASE_NONE, NULL, 0, NULL, HFILL }
|
|
},
|
|
{ &hf_mdb_ack,
|
|
{ "Ack byte", "mdb.ack",
|
|
FT_UINT8, BASE_HEX, VALS(mdb_ack), 0, NULL, HFILL }
|
|
},
|
|
{ &hf_mdb_data,
|
|
{ "Data", "mdb.data",
|
|
FT_BYTES, BASE_NONE, NULL, 0, NULL, HFILL }
|
|
},
|
|
{ &hf_mdb_chk,
|
|
{ "Checksum", "mdb.chk",
|
|
FT_UINT8, BASE_HEX, NULL, 0, NULL, HFILL }
|
|
}
|
|
};
|
|
|
|
static ei_register_info ei[] = {
|
|
{ &ei_mdb_short_packet,
|
|
{ "mdb.short_packet", PI_PROTOCOL, PI_ERROR,
|
|
"MDB packet without payload", EXPFILL }}
|
|
};
|
|
|
|
proto_mdb = proto_register_protocol("Multi-Drop Bus", "MDB", "mdb");
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
proto_register_field_array(proto_mdb, hf, array_length(hf));
|
|
expert_mdb = expert_register_protocol(proto_mdb);
|
|
expert_register_field_array(expert_mdb, ei, array_length(ei));
|
|
mdb_handle = register_dissector("mdb", dissect_mdb, proto_mdb);
|
|
}
|
|
|
|
void proto_reg_handoff_mdb(void)
|
|
{
|
|
dissector_add_uint("wtap_encap", WTAP_ENCAP_MDB, mdb_handle);
|
|
}
|
|
|
|
/*
|
|
* Editor modelines - https://www.wireshark.org/tools/modelines.html
|
|
*
|
|
* Local variables:
|
|
* c-basic-offset: 4
|
|
* tab-width: 8
|
|
* indent-tabs-mode: nil
|
|
* End:
|
|
*
|
|
* vi: set shiftwidth=4 tabstop=8 expandtab:
|
|
* :indentSize=4:tabSize=8:noTabs=true:
|
|
*/
|