277 lines
7.2 KiB
C
277 lines
7.2 KiB
C
/* packet-rdm.c
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* RDM (Remote Device Management) packet disassembly.
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*
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* $Id$
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*
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* This dissector is written by
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*
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* Shaun Jackman <sjackman@gmail.com>
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* Copyright 2006 Pathway Connectivity
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*
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* Erwin Rol <erwin@erwinrol.com>
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* Copyright 2003 Erwin Rol
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*
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* Wireshark - Network traffic analyzer
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* Gerald Combs <gerald@wireshark.org>
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* Copyright 1999 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor
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* Boston, MA 02110-1301, USA.
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*/
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/*
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* ANSI E1.20-2006, Entertainment Technology
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* Remote Device Management over USITT DMX512, describes a method of
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* bi-directional communications over a USITT DMX512/1990 data link
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* between an entertainment lighting controller and one or more
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* remotely controlled lighting devices. The protocol also is intended
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* to work with the ANSI E1.11-2004 control protocol. It allows
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* discovery of devices on a DMX512/E1.11 network and the remote
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* setting of DMX starting addresses, as well as status and fault
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* reporting back to the control console.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <glib.h>
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#include <epan/packet.h>
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static int proto_rdm = -1;
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static int hf_rdm_start_code = -1;
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static int hf_rdm_sub_start_code = -1;
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static int hf_rdm_message_length = -1;
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static int hf_rdm_dest_uid = -1;
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static int hf_rdm_src_uid = -1;
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static int hf_rdm_transaction_number = -1;
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static int hf_rdm_response_type = -1;
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static int hf_rdm_message_count = -1;
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static int hf_rdm_sub_device = -1;
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static int hf_rdm_command_class = -1;
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static int hf_rdm_parameter_id = -1;
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static int hf_rdm_parameter_data_length = -1;
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static int hf_rdm_parameter_data = -1;
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static int hf_rdm_intron = -1;
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static int hf_rdm_checksum = -1;
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static int hf_rdm_trailer = -1;
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static int ett_rdm = -1;
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static guint16
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rdm_checksum(tvbuff_t *tvb, unsigned length)
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{
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guint16 sum = 0;
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unsigned i;
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for (i = 0; i < length; i++)
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sum += tvb_get_guint8(tvb, i);
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return sum;
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}
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static void
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dissect_rdm(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "RDM");
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col_clear(pinfo->cinfo, COL_INFO);
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if (tree != NULL) {
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unsigned message_length, checksum, checksum_shouldbe,
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parameter_data_length, offset = 0;
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proto_item *item;
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proto_tree *ti = proto_tree_add_item(tree, proto_rdm, tvb,
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offset, -1, FALSE);
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proto_tree *rdm_tree = proto_item_add_subtree(ti, ett_rdm);
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proto_tree_add_item(rdm_tree, hf_rdm_start_code, tvb,
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offset, 1, FALSE);
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offset++;
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proto_tree_add_item(rdm_tree, hf_rdm_sub_start_code, tvb,
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offset, 1, FALSE);
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offset++;
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message_length = tvb_get_guint8(tvb, offset);
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proto_tree_add_item(rdm_tree, hf_rdm_message_length, tvb,
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offset, 1, FALSE);
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offset++;
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proto_tree_add_item(rdm_tree, hf_rdm_dest_uid, tvb,
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offset, 6, FALSE);
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offset += 6;
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proto_tree_add_item(rdm_tree, hf_rdm_src_uid, tvb,
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offset, 6, FALSE);
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offset += 6;
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proto_tree_add_item(rdm_tree, hf_rdm_transaction_number, tvb,
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offset, 1, FALSE);
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offset++;
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proto_tree_add_item(rdm_tree, hf_rdm_response_type, tvb,
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offset, 1, FALSE);
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offset++;
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proto_tree_add_item(rdm_tree, hf_rdm_message_count, tvb,
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offset, 1, FALSE);
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offset++;
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proto_tree_add_item(rdm_tree, hf_rdm_sub_device, tvb,
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offset, 2, FALSE);
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offset += 2;
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proto_tree_add_item(rdm_tree, hf_rdm_command_class, tvb,
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offset, 1, FALSE);
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offset++;
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proto_tree_add_item(rdm_tree, hf_rdm_parameter_id, tvb,
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offset, 2, FALSE);
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offset += 2;
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parameter_data_length = tvb_get_guint8(tvb, offset);
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proto_tree_add_item(rdm_tree, hf_rdm_parameter_data_length, tvb,
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offset, 1, FALSE);
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offset++;
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if (parameter_data_length > 0) {
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proto_tree_add_item(rdm_tree, hf_rdm_parameter_data, tvb,
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offset, parameter_data_length, FALSE);
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offset += parameter_data_length;
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}
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if (offset < message_length) {
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proto_tree_add_item(rdm_tree, hf_rdm_intron, tvb,
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offset, message_length - offset, FALSE);
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offset = message_length;
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}
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checksum_shouldbe = rdm_checksum(tvb, offset);
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checksum = tvb_get_ntohs(tvb, offset);
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item = proto_tree_add_item(rdm_tree, hf_rdm_checksum, tvb,
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offset, 2, FALSE);
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if (checksum == checksum_shouldbe) {
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proto_item_append_text(item, " [correct]");
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} else {
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proto_item_append_text(item, " [incorrect, should be 0x%04x]", checksum_shouldbe);
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}
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offset += 2;
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if (offset < tvb_length(tvb))
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proto_tree_add_item(rdm_tree, hf_rdm_trailer, tvb,
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offset, -1, FALSE);
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}
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}
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void
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proto_register_rdm(void)
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{
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static hf_register_info hf[] = {
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{ &hf_rdm_start_code,
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{ "Start code", "rdm.sc",
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FT_UINT8, BASE_HEX, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_rdm_sub_start_code,
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{ "Sub-start code", "rdm.ssc",
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FT_UINT8, BASE_HEX, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_rdm_message_length,
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{ "Message length", "rdm.len",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_rdm_dest_uid,
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{ "Destination UID", "rdm.dst",
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FT_BYTES, BASE_NONE, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_rdm_src_uid,
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{ "Source UID", "rdm.src",
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FT_BYTES, BASE_NONE, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_rdm_transaction_number,
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{ "Transaction number", "rdm.tn",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_rdm_response_type,
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{ "Response type", "rdm.rt",
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FT_UINT8, BASE_HEX, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_rdm_message_count,
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{ "Message count", "rdm.mc",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_rdm_sub_device,
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{ "Sub-device", "rdm.sd",
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FT_UINT16, BASE_DEC, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_rdm_command_class,
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{ "Command class", "rdm.cc",
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FT_UINT8, BASE_HEX, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_rdm_parameter_id,
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{ "Parameter ID", "rdm.pid",
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FT_UINT16, BASE_HEX, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_rdm_parameter_data_length,
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{ "Parameter data length", "rdm.pdl",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_rdm_parameter_data,
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{ "Parameter data", "rdm.pd",
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FT_BYTES, BASE_NONE, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_rdm_intron,
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{ "Intron", "rdm.intron",
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FT_BYTES, BASE_NONE, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_rdm_checksum,
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{ "Checksum", "rdm.checksum",
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FT_UINT16, BASE_HEX, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_rdm_trailer,
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{ "Trailer", "rdm.trailer",
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FT_BYTES, BASE_NONE, NULL, 0x0,
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NULL, HFILL }}
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};
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static gint *ett[] = {
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&ett_rdm
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};
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proto_rdm = proto_register_protocol("Remote Device Management",
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"RDM", "rdm");
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proto_register_field_array(proto_rdm, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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register_dissector("rdm", dissect_rdm, proto_rdm);
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}
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void
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proto_reg_handoff_rdm(void)
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{
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}
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