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/* packet-rdm.c
* RDM (Remote Device Management) packet disassembly.
*
* $Id$
*
* This dissector is written by
*
* Shaun Jackman <sjackman@gmail.com>
* Copyright 2006 Pathway Connectivity
*
* Erwin Rol <erwin@erwinrol.com>
* Copyright 2003 Erwin Rol
*
* Wireshark - Network traffic analyzer
* Gerald Combs <gerald@wireshark.org>
* Copyright 1999 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.
*/
/*
* ANSI E1.20-2006, Entertainment Technology
* Remote Device Management over USITT DMX512, describes a method of
* bi-directional communications over a USITT DMX512/1990 data link
* between an entertainment lighting controller and one or more
* remotely controlled lighting devices. The protocol also is intended
* to work with the ANSI E1.11-2004 control protocol. It allows
* discovery of devices on a DMX512/E1.11 network and the remote
* setting of DMX starting addresses, as well as status and fault
* reporting back to the control console.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <glib.h>
#include <epan/packet.h>
static int proto_rdm = -1;
static int hf_rdm_start_code = -1;
static int hf_rdm_sub_start_code = -1;
static int hf_rdm_message_length = -1;
static int hf_rdm_dest_uid = -1;
static int hf_rdm_src_uid = -1;
static int hf_rdm_transaction_number = -1;
static int hf_rdm_response_type = -1;
static int hf_rdm_message_count = -1;
static int hf_rdm_sub_device = -1;
static int hf_rdm_command_class = -1;
static int hf_rdm_parameter_id = -1;
static int hf_rdm_parameter_data_length = -1;
static int hf_rdm_parameter_data = -1;
static int hf_rdm_intron = -1;
static int hf_rdm_checksum = -1;
static int hf_rdm_trailer = -1;
static int ett_rdm = -1;
static guint16
rdm_checksum(tvbuff_t *tvb, unsigned length)
{
guint16 sum = 0;
unsigned i;
for (i = 0; i < length; i++)
sum += tvb_get_guint8(tvb, i);
return sum;
}
static void
dissect_rdm(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
col_set_str(pinfo->cinfo, COL_PROTOCOL, "RDM");
col_clear(pinfo->cinfo, COL_INFO);
if (tree != NULL) {
unsigned message_length, checksum, checksum_shouldbe,
parameter_data_length, offset = 0;
proto_item *item;
proto_tree *ti = proto_tree_add_item(tree, proto_rdm, tvb,
offset, -1, FALSE);
proto_tree *rdm_tree = proto_item_add_subtree(ti, ett_rdm);
proto_tree_add_item(rdm_tree, hf_rdm_start_code, tvb,
offset, 1, FALSE);
offset++;
proto_tree_add_item(rdm_tree, hf_rdm_sub_start_code, tvb,
offset, 1, FALSE);
offset++;
message_length = tvb_get_guint8(tvb, offset);
proto_tree_add_item(rdm_tree, hf_rdm_message_length, tvb,
offset, 1, FALSE);
offset++;
proto_tree_add_item(rdm_tree, hf_rdm_dest_uid, tvb,
offset, 6, FALSE);
offset += 6;
proto_tree_add_item(rdm_tree, hf_rdm_src_uid, tvb,
offset, 6, FALSE);
offset += 6;
proto_tree_add_item(rdm_tree, hf_rdm_transaction_number, tvb,
offset, 1, FALSE);
offset++;
proto_tree_add_item(rdm_tree, hf_rdm_response_type, tvb,
offset, 1, FALSE);
offset++;
proto_tree_add_item(rdm_tree, hf_rdm_message_count, tvb,
offset, 1, FALSE);
offset++;
proto_tree_add_item(rdm_tree, hf_rdm_sub_device, tvb,
offset, 2, FALSE);
offset += 2;
proto_tree_add_item(rdm_tree, hf_rdm_command_class, tvb,
offset, 1, FALSE);
offset++;
proto_tree_add_item(rdm_tree, hf_rdm_parameter_id, tvb,
offset, 2, FALSE);
offset += 2;
parameter_data_length = tvb_get_guint8(tvb, offset);
proto_tree_add_item(rdm_tree, hf_rdm_parameter_data_length, tvb,
offset, 1, FALSE);
offset++;
if (parameter_data_length > 0) {
proto_tree_add_item(rdm_tree, hf_rdm_parameter_data, tvb,
offset, parameter_data_length, FALSE);
offset += parameter_data_length;
}
if (offset < message_length) {
proto_tree_add_item(rdm_tree, hf_rdm_intron, tvb,
offset, message_length - offset, FALSE);
offset = message_length;
}
checksum_shouldbe = rdm_checksum(tvb, offset);
checksum = tvb_get_ntohs(tvb, offset);
item = proto_tree_add_item(rdm_tree, hf_rdm_checksum, tvb,
offset, 2, FALSE);
if (checksum == checksum_shouldbe) {
proto_item_append_text(item, " [correct]");
} else {
proto_item_append_text(item, " [incorrect, should be 0x%04x]", checksum_shouldbe);
}
offset += 2;
if (offset < tvb_length(tvb))
proto_tree_add_item(rdm_tree, hf_rdm_trailer, tvb,
offset, -1, FALSE);
}
}
void
proto_register_rdm(void)
{
static hf_register_info hf[] = {
{ &hf_rdm_start_code,
{ "Start code", "rdm.sc",
FT_UINT8, BASE_HEX, NULL, 0x0,
NULL, HFILL }},
{ &hf_rdm_sub_start_code,
{ "Sub-start code", "rdm.ssc",
FT_UINT8, BASE_HEX, NULL, 0x0,
NULL, HFILL }},
{ &hf_rdm_message_length,
{ "Message length", "rdm.len",
FT_UINT8, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_rdm_dest_uid,
{ "Destination UID", "rdm.dst",
FT_BYTES, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_rdm_src_uid,
{ "Source UID", "rdm.src",
FT_BYTES, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_rdm_transaction_number,
{ "Transaction number", "rdm.tn",
FT_UINT8, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_rdm_response_type,
{ "Response type", "rdm.rt",
FT_UINT8, BASE_HEX, NULL, 0x0,
NULL, HFILL }},
{ &hf_rdm_message_count,
{ "Message count", "rdm.mc",
FT_UINT8, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_rdm_sub_device,
{ "Sub-device", "rdm.sd",
FT_UINT16, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_rdm_command_class,
{ "Command class", "rdm.cc",
FT_UINT8, BASE_HEX, NULL, 0x0,
NULL, HFILL }},
{ &hf_rdm_parameter_id,
{ "Parameter ID", "rdm.pid",
FT_UINT16, BASE_HEX, NULL, 0x0,
NULL, HFILL }},
{ &hf_rdm_parameter_data_length,
{ "Parameter data length", "rdm.pdl",
FT_UINT8, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_rdm_parameter_data,
{ "Parameter data", "rdm.pd",
FT_BYTES, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_rdm_intron,
{ "Intron", "rdm.intron",
FT_BYTES, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_rdm_checksum,
{ "Checksum", "rdm.checksum",
FT_UINT16, BASE_HEX, NULL, 0x0,
NULL, HFILL }},
{ &hf_rdm_trailer,
{ "Trailer", "rdm.trailer",
FT_BYTES, BASE_NONE, NULL, 0x0,
NULL, HFILL }}
};
static gint *ett[] = {
&ett_rdm
};
proto_rdm = proto_register_protocol("Remote Device Management",
"RDM", "rdm");
proto_register_field_array(proto_rdm, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
register_dissector("rdm", dissect_rdm, proto_rdm);
}
void
proto_reg_handoff_rdm(void)
{
}
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