2012-05-28 15:24:54 +00:00
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/* packet-dmx-test.c
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* DMX Test packet disassembly.
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*
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2012-05-28 15:29:36 +00:00
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* $Id$
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2012-05-28 15:24:54 +00:00
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*
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* This dissector is written by
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*
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* Erwin Rol <erwin@erwinrol.com>
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* Copyright 2011 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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* This dissector is based on;
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* American National Standard E1.11 - 2004
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* Entertainment Technology USITT DMX512-A
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* Asynchronous Serial Digital Data Transmission Standard
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* for Controlling Lighting Equipment and Accessories
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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 <epan/packet.h>
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2012-07-16 12:34:33 +00:00
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#define DMX_TEST_PACKET_SIZE 512
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#define DMX_TEST_VALUE 0x55
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2012-05-28 15:24:54 +00:00
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static int proto_dmx_test = -1;
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static int hf_dmx_test_data = -1;
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static int hf_dmx_test_data_good = -1;
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static int hf_dmx_test_data_bad = -1;
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static int ett_dmx_test = -1;
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static void
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dissect_dmx_test(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "DMX Test Frame");
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col_clear(pinfo->cinfo, COL_INFO);
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if (tree != NULL) {
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2012-07-16 12:34:33 +00:00
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unsigned offset = 0;
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unsigned size, i, test_data_is_ok;
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proto_tree *test_data_tree;
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2012-05-28 15:24:54 +00:00
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proto_item *item;
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proto_tree *ti = proto_tree_add_item(tree, proto_dmx_test, tvb,
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offset, -1, FALSE);
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proto_tree *dmx_test_tree = proto_item_add_subtree(ti, ett_dmx_test);
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size = tvb_reported_length_remaining(tvb, offset);
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item = proto_tree_add_item(dmx_test_tree, hf_dmx_test_data, tvb,
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offset, size, ENC_BIG_ENDIAN);
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offset += size;
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if (size == DMX_TEST_PACKET_SIZE) {
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test_data_is_ok = TRUE;
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for (i = 0; i < DMX_TEST_PACKET_SIZE; i++) {
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if (tvb_get_guint8(tvb, i) != DMX_TEST_VALUE) {
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test_data_is_ok = FALSE;
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break;
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}
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}
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} else {
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test_data_is_ok = FALSE;
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}
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if (test_data_is_ok) {
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proto_item_append_text(ti, ", Data correct");
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proto_item_append_text(item, " [correct]");
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test_data_tree = proto_item_add_subtree(item, ett_dmx_test);
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item = proto_tree_add_boolean(test_data_tree, hf_dmx_test_data_good, tvb,
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offset, size, TRUE);
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PROTO_ITEM_SET_GENERATED(item);
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item = proto_tree_add_boolean(test_data_tree, hf_dmx_test_data_bad, tvb,
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offset, size, FALSE);
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PROTO_ITEM_SET_GENERATED(item);
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} else {
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proto_item_append_text(ti, ", Data incorrect");
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proto_item_append_text(item, " [incorrect]");
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test_data_tree = proto_item_add_subtree(item, ett_dmx_test);
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item = proto_tree_add_boolean(test_data_tree, hf_dmx_test_data_good, tvb,
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offset, size, FALSE);
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PROTO_ITEM_SET_GENERATED(item);
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item = proto_tree_add_boolean(test_data_tree, hf_dmx_test_data_bad, tvb,
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offset, size, TRUE);
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PROTO_ITEM_SET_GENERATED(item);
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}
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}
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}
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void
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proto_register_dmx_test(void)
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{
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static hf_register_info hf[] = {
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{ &hf_dmx_test_data,
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{ "Test Data", "dmx_test.data",
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FT_BYTES, BASE_NONE, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_dmx_test_data_good,
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{ "Data Good", "dmx_test.data_good",
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FT_BOOLEAN, BASE_NONE, NULL, 0x0,
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"True: test data is correct; False: test data is incorrect", HFILL }},
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{ &hf_dmx_test_data_bad,
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{ "Data Bad", "dmx_test.data_bad",
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FT_BOOLEAN, BASE_NONE, NULL, 0x0,
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"True: test data is incorrect; False: test data is correct", HFILL }},
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};
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static gint *ett[] = {
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&ett_dmx_test
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};
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proto_dmx_test = proto_register_protocol("DMX Test Frame", "DMX Test Frame", "dmx-test");
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proto_register_field_array(proto_dmx_test, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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register_dissector("dmx-test", dissect_dmx_test, proto_dmx_test);
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}
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