epan/dissectors/packet-mbtcp.h

   1 /* packet-mbtcp.h
   2  *
   3  * Routines for Modbus/TCP dissection
   4  * By Riaan Swart <rswart@cs.sun.ac.za>
   5  * Copyright 2001, Institute for Applied Computer Science
   6  *                                       University of Stellenbosch
   7  *
   8  * See http://www.modbus.org/ for information on Modbus/TCP.
   9  *
  10  * $Id$
  11  *
  12  * Wireshark - Network traffic analyzer
  13  * By Gerald Combs <gerald@wireshark.org>
  14  * Copyright 1998 Gerald Combs
  15  *
  16  * This program is free software; you can redistribute it and/or
  17  * modify it under the terms of the GNU General Public License
  18  * as published by the Free Software Foundation; either version 2
  19  * of the License, or (at your option) any later version.
  20  *
  21  * This program is distributed in the hope that it will be useful,
  22  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  23  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24  * GNU General Public License for more details.
  25  *
  26  * You should have received a copy of the GNU General Public License
  27  * along with this program; if not, write to the Free Software
  28  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  29  */
  30 #define PORT_MBTCP              502     /* Modbus/TCP located on port 502, with IANA registration */
  31 #define PORT_MBRTU              0       /* Modbus RTU over TCP does not have a standard port, default to zero */
  32
  33 /* Modbus protocol function codes */
  34 #define READ_COILS                              1
  35 #define READ_DISCRETE_INPUTS    2
  36 #define READ_HOLDING_REGS               3
  37 #define READ_INPUT_REGS                 4
  38 #define WRITE_SINGLE_COIL               5
  39 #define WRITE_SINGLE_REG                6
  40 #define READ_EXCEPT_STAT                7
  41 #define DIAGNOSTICS                             8
  42 #define GET_COMM_EVENT_CTRS             11
  43 #define GET_COMM_EVENT_LOG              12
  44 #define WRITE_MULT_COILS                15
  45 #define WRITE_MULT_REGS                 16
  46 #define REPORT_SLAVE_ID                 17
  47 #define READ_FILE_RECORD                20
  48 #define WRITE_FILE_RECORD               21
  49 #define MASK_WRITE_REG                  22
  50 #define READ_WRITE_REG                  23
  51 #define READ_FIFO_QUEUE                 24
  52 #define ENCAP_INTERFACE_TRANSP  43
  53
  54 /* Modbus protocol exception codes */
  55 #define ILLEGAL_FUNCTION        0x01
  56 #define ILLEGAL_ADDRESS         0x02
  57 #define ILLEGAL_VALUE           0x03
  58 #define SLAVE_FAILURE   0x04
  59 #define ACKNOWLEDGE             0x05
  60 #define SLAVE_BUSY              0x06
  61 #define MEMORY_ERR              0x08
  62 #define GATEWAY_UNAVAILABLE     0x0a
  63 #define GATEWAY_TRGT_FAIL       0x0b
  64
  65 /* Modbus diagnostic subfunction codes */
  66 #define RETURN_QUERY_DATA                 0x00
  67 #define RESTART_COMMUNICATION_OPTION      0x01
  68 #define RETURN_DIAGNOSTIC_REGISTER        0x02
  69 #define CHANGE_ASCII_INPUT_DELIMITER      0x03
  70 #define FORCE_LISTEN_ONLY_MODE            0x04
  71 #define CLEAR_COUNTERS_AND_DIAG_REG       0x0A
  72 #define RETURN_BUS_MESSAGE_COUNT          0x0B
  73 #define RETURN_BUS_COMM_ERROR_COUNT       0x0C
  74 #define RETURN_BUS_EXCEPTION_ERROR_COUNT  0x0D
  75 #define RETURN_SLAVE_MESSAGE_COUNT        0x0E
  76 #define RETURN_SLAVE_NO_RESPONSE_COUNT    0x0F
  77 #define RETURN_SLAVE_NAK_COUNT            0x10
  78 #define RETURN_SLAVE_BUSY_COUNT           0x11
  79 #define RETURN_BUS_CHAR_OVERRUN_COUNT     0x12
  80 #define CLEAR_OVERRUN_COUNTER_AND_FLAG    0x14
  81
  82
  83
  84 /* Encapsulation Interface codes */
  85 #define CANOPEN_REQ_RESP   0x0D
  86 #define READ_DEVICE_ID     0x0E
  87
  88 /* Event byte codes */
  89 #define REMOTE_DEVICE_RECV_EVENT_MASK     0x80
  90 #define REMOTE_DEVICE_SEND_EVENT_MASK     0xc0
  91 #define REMOTE_DEVICE_SEND_EVENT_VALUE    0x40
  92
  93 /* return codes of function classifying packets as query/response */
  94 #define QUERY_PACKET            0
  95 #define RESPONSE_PACKET         1
  96 #define CANNOT_CLASSIFY         2
  97
  98 #define MODBUS_PROTOCOL_ID 0
  99
 100 /* Preferences for Modbus/TCP Dissector */
 101 #define MBTCP_PREF_REGISTER_FORMAT_UINT16                       0
 102 #define MBTCP_PREF_REGISTER_FORMAT_UINT32                       1
 103 #define MBTCP_PREF_REGISTER_FORMAT_IEEE_FLOAT           2
 104 #define MBTCP_PREF_REGISTER_FORMAT_MODICON_FLOAT        3
 105
 106 #define MBTCP_PREF_REGISTER_ADDR_RAW    0
 107 #define MBTCP_PREF_REGISTER_ADDR_MOD5   1
 108 #define MBTCP_PREF_REGISTER_ADDR_MOD6   2
 109
 110
 111 typedef struct {
 112     guint8 register_format;
 113     guint8 register_addr_type;
 114     guint8 packet_type;
 115 } modbus_request_info_t;