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/* packet-dmx-sip.c
* DMX SIP packet disassembly.
*
* This dissector is written by
*
* Erwin Rol <erwin@erwinrol.com>
* Copyright 2011 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.
*/
/*
* This dissector is based on;
* American National Standard E1.11 - 2004
* Entertainment Technology USITT DMX512-A
* Asynchronous Serial Digital Data Transmission Standard
* for Controlling Lighting Equipment and Accessories
*/
#include "config.h"
#include <epan/packet.h>
#define DMX_SC_SIP 0xCF
void proto_register_dmx_sip(void);
static int proto_dmx_sip = -1;
static int hf_dmx_sip_byte_count = -1;
static int hf_dmx_sip_control_bit_field = -1;
static int hf_dmx_sip_prev_packet_checksum = -1;
static int hf_dmx_sip_seq_nr = -1;
static int hf_dmx_sip_dmx_universe_nr = -1;
static int hf_dmx_sip_dmx_proc_level = -1;
static int hf_dmx_sip_dmx_software_version = -1;
static int hf_dmx_sip_dmx_packet_len = -1;
static int hf_dmx_sip_dmx_nr_packets = -1;
static int hf_dmx_sip_orig_dev_id = -1;
static int hf_dmx_sip_sec_dev_id = -1;
static int hf_dmx_sip_third_dev_id = -1;
static int hf_dmx_sip_fourth_dev_id = -1;
static int hf_dmx_sip_fifth_dev_id = -1;
static int hf_dmx_sip_reserved = -1;
static int hf_dmx_sip_checksum = -1;
static int hf_dmx_sip_checksum_good = -1;
static int hf_dmx_sip_checksum_bad = -1;
static int hf_dmx_sip_trailer = -1;
static int ett_dmx_sip = -1;
static guint8
dmx_sip_checksum(tvbuff_t *tvb, guint length)
{
guint8 sum = DMX_SC_SIP;
guint i;
for (i = 0; i < length; i++)
sum += tvb_get_guint8(tvb, i);
return sum;
}
static void
dissect_dmx_sip(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
col_set_str(pinfo->cinfo, COL_PROTOCOL, "DMX SIP");
col_clear(pinfo->cinfo, COL_INFO);
if (tree != NULL) {
guint offset = 0;
guint byte_count;
guint checksum, checksum_shouldbe;
proto_item *item;
proto_tree *checksum_tree;
proto_tree *ti = proto_tree_add_item(tree, proto_dmx_sip, tvb,
offset, -1, ENC_NA);
proto_tree *dmx_sip_tree = proto_item_add_subtree(ti, ett_dmx_sip);
byte_count = tvb_get_guint8(tvb, offset);
proto_tree_add_item(dmx_sip_tree, hf_dmx_sip_byte_count, tvb,
offset, 1, ENC_BIG_ENDIAN);
offset++;
proto_tree_add_item(dmx_sip_tree, hf_dmx_sip_control_bit_field, tvb,
offset, 1, ENC_BIG_ENDIAN);
offset++;
proto_tree_add_item(dmx_sip_tree, hf_dmx_sip_prev_packet_checksum, tvb,
offset, 2, ENC_BIG_ENDIAN);
offset += 2;
proto_tree_add_item(dmx_sip_tree, hf_dmx_sip_seq_nr, tvb,
offset, 1, ENC_BIG_ENDIAN);
offset++;
proto_tree_add_item(dmx_sip_tree, hf_dmx_sip_dmx_universe_nr, tvb,
offset, 1, ENC_BIG_ENDIAN);
offset++;
proto_tree_add_item(dmx_sip_tree, hf_dmx_sip_dmx_proc_level, tvb,
offset, 1, ENC_BIG_ENDIAN);
offset++;
proto_tree_add_item(dmx_sip_tree, hf_dmx_sip_dmx_software_version, tvb,
offset, 1, ENC_BIG_ENDIAN);
offset++;
proto_tree_add_item(dmx_sip_tree, hf_dmx_sip_dmx_packet_len, tvb,
offset, 2, ENC_BIG_ENDIAN);
offset += 2;
proto_tree_add_item(dmx_sip_tree, hf_dmx_sip_dmx_nr_packets, tvb,
offset, 2, ENC_BIG_ENDIAN);
offset += 2;
proto_tree_add_item(dmx_sip_tree, hf_dmx_sip_orig_dev_id, tvb,
offset, 2, ENC_BIG_ENDIAN);
offset += 2;
proto_tree_add_item(dmx_sip_tree, hf_dmx_sip_sec_dev_id, tvb,
offset, 2, ENC_BIG_ENDIAN);
offset += 2;
proto_tree_add_item(dmx_sip_tree, hf_dmx_sip_third_dev_id, tvb,
offset, 2, ENC_BIG_ENDIAN);
offset += 2;
proto_tree_add_item(dmx_sip_tree, hf_dmx_sip_fourth_dev_id, tvb,
offset, 2, ENC_BIG_ENDIAN);
offset += 2;
proto_tree_add_item(dmx_sip_tree, hf_dmx_sip_fifth_dev_id, tvb,
offset, 2, ENC_BIG_ENDIAN);
offset += 2;
if (offset < byte_count) {
proto_tree_add_item(dmx_sip_tree, hf_dmx_sip_reserved, tvb,
offset, byte_count - offset, ENC_NA);
offset += (byte_count - offset);
}
dmx_sip_checksum(tvb, offset);
checksum_shouldbe = dmx_sip_checksum(tvb, offset);
checksum = tvb_get_guint8(tvb, offset);
item = proto_tree_add_item(dmx_sip_tree, hf_dmx_sip_checksum, tvb,
offset, 1, ENC_BIG_ENDIAN);
if (checksum == checksum_shouldbe) {
proto_item_append_text(item, " [correct]");
checksum_tree = proto_item_add_subtree(item, ett_dmx_sip);
item = proto_tree_add_boolean(checksum_tree, hf_dmx_sip_checksum_good, tvb,
offset, 1, TRUE);
PROTO_ITEM_SET_GENERATED(item);
item = proto_tree_add_boolean(checksum_tree, hf_dmx_sip_checksum_bad, tvb,
offset, 1, FALSE);
PROTO_ITEM_SET_GENERATED(item);
} else {
proto_item_append_text(item, " [incorrect, should be 0x%02x]", checksum_shouldbe);
checksum_tree = proto_item_add_subtree(item, ett_dmx_sip);
item = proto_tree_add_boolean(checksum_tree, hf_dmx_sip_checksum_good, tvb,
offset, 1, FALSE);
PROTO_ITEM_SET_GENERATED(item);
item = proto_tree_add_boolean(checksum_tree, hf_dmx_sip_checksum_bad, tvb,
offset, 1, TRUE);
PROTO_ITEM_SET_GENERATED(item);
}
offset += 1;
if (offset < tvb_length(tvb))
proto_tree_add_item(dmx_sip_tree, hf_dmx_sip_trailer, tvb,
offset, -1, ENC_NA);
}
}
void
proto_register_dmx_sip(void)
{
static hf_register_info hf[] = {
{ &hf_dmx_sip_byte_count,
{ "Byte Count", "dmx_sip.byte_count",
FT_UINT8, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_dmx_sip_control_bit_field,
{ "Control Bit Field", "dmx_sip.control_bit_field",
FT_UINT8, BASE_HEX, NULL, 0x0,
NULL, HFILL }},
{ &hf_dmx_sip_prev_packet_checksum,
{ "Checksum of prev. packet", "dmx_sip.prev_packet_checksum",
FT_UINT16, BASE_HEX, NULL, 0x0,
NULL, HFILL }},
{ &hf_dmx_sip_seq_nr,
{ "SIP sequence nr.", "dmx_sip.seq_nr",
FT_UINT8, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_dmx_sip_dmx_universe_nr,
{ "DMX512 universe nr.", "dmx_sip.dmx_universe_nr",
FT_UINT8, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_dmx_sip_dmx_proc_level,
{ "DMX512 processing level", "dmx_sip.dmx_proc_level",
FT_UINT8, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_dmx_sip_dmx_software_version,
{ "Software Version", "dmx_sip.dmx_software_version",
FT_UINT8, BASE_HEX, NULL, 0x0,
NULL, HFILL }},
{ &hf_dmx_sip_dmx_packet_len,
{ "Standard Packet Len", "dmx_sip.dmx_packet_len",
FT_UINT16, BASE_HEX, NULL, 0x0,
NULL, HFILL }},
{ &hf_dmx_sip_dmx_nr_packets,
{ "Number of Packets", "dmx_sip.dmx_nr_packets",
FT_UINT16, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_dmx_sip_orig_dev_id,
{ "1st Device's ID", "dmx_sip.orig_dev_id",
FT_UINT16, BASE_HEX, NULL, 0x0,
NULL, HFILL }},
{ &hf_dmx_sip_sec_dev_id,
{ "2nd Device's ID", "dmx_sip.sec_dev_id",
FT_UINT16, BASE_HEX, NULL, 0x0,
NULL, HFILL }},
{ &hf_dmx_sip_third_dev_id,
{ "3rd Device's ID", "dmx_sip.third_dev_id",
FT_UINT16, BASE_HEX, NULL, 0x0,
NULL, HFILL }},
{ &hf_dmx_sip_fourth_dev_id,
{ "4th Device's ID", "dmx_sip.fourth_dev_id",
FT_UINT16, BASE_HEX, NULL, 0x0,
NULL, HFILL }},
{ &hf_dmx_sip_fifth_dev_id,
{ "5th Device's ID", "dmx_sip.fifth_dev_id",
FT_UINT16, BASE_HEX, NULL, 0x0,
NULL, HFILL }},
{ &hf_dmx_sip_reserved,
{ "Reserved", "dmx_sip.reserved",
FT_BYTES, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_dmx_sip_checksum,
{ "Checksum", "dmx_sip.checksum",
FT_UINT8, BASE_HEX, NULL, 0x0,
NULL, HFILL }},
{ &hf_dmx_sip_checksum_good,
{ "Good Checksum", "dmx_sip.checksum_good",
FT_BOOLEAN, BASE_NONE, NULL, 0x0,
"True: checksum matches packet content; False: doesn't match content", HFILL }},
{ &hf_dmx_sip_checksum_bad,
{ "Bad Checksum", "dmx_sip.checksum_bad",
FT_BOOLEAN, BASE_NONE, NULL, 0x0,
"True: checksum doesn't match packet content; False: matches content", HFILL }},
{ &hf_dmx_sip_trailer,
{ "Trailer", "dmx_sip.trailer",
FT_BYTES, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
};
static gint *ett[] = {
&ett_dmx_sip
};
proto_dmx_sip = proto_register_protocol("DMX SIP", "DMX SIP", "dmx-sip");
proto_register_field_array(proto_dmx_sip, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
register_dissector("dmx-sip", dissect_dmx_sip, proto_dmx_sip);
}
|
