forked from osmocom/wireshark
150 lines
3.8 KiB
C
150 lines
3.8 KiB
C
/* packet-dmx.c
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* DMX packet disassembly.
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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 2012 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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#include "config.h"
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#include <epan/packet.h>
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#define DMX_SC_DMX 0x00
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#define DMX_SC_TEXT 0x17
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#define DMX_SC_TEST 0x55
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#define DMX_SC_RDM 0xCC
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#define DMX_SC_SIP 0xCF
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static const value_string dmx_sc_vals[] = {
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{ DMX_SC_DMX, "DMX" },
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{ DMX_SC_TEXT, "Text" },
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{ DMX_SC_TEST, "Test" },
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{ DMX_SC_RDM, "RDM" },
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{ DMX_SC_SIP, "SIP" },
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{ 0, NULL },
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};
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void proto_register_dmx(void);
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void proto_reg_handoff_dmx(void);
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static int proto_dmx = -1;
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static int hf_dmx_start_code = -1;
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static dissector_handle_t rdm_handle;
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static dissector_handle_t dmx_chan_handle;
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static dissector_handle_t dmx_test_handle;
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static dissector_handle_t dmx_text_handle;
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static dissector_handle_t dmx_sip_handle;
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static dissector_handle_t data_handle;
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static void
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dissect_dmx(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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tvbuff_t *next_tvb;
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guint offset = 0;
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guint8 start_code;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "DMX");
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col_clear(pinfo->cinfo, COL_INFO);
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start_code = tvb_get_guint8(tvb, offset);
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proto_tree_add_item(tree, hf_dmx_start_code, tvb,
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offset, 1, ENC_BIG_ENDIAN);
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offset++;
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next_tvb = tvb_new_subset_remaining(tvb, offset);
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switch (start_code) {
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case DMX_SC_DMX:
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call_dissector(dmx_chan_handle, next_tvb, pinfo, tree);
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break;
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case DMX_SC_TEXT:
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call_dissector(dmx_text_handle, next_tvb, pinfo, tree);
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break;
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case DMX_SC_TEST:
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call_dissector(dmx_test_handle, next_tvb, pinfo, tree);
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break;
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case DMX_SC_RDM:
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call_dissector(rdm_handle, next_tvb, pinfo, tree);
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break;
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case DMX_SC_SIP:
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call_dissector(dmx_sip_handle, next_tvb, pinfo, tree);
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break;
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default:
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if (offset < tvb_reported_length(tvb))
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call_dissector(data_handle, next_tvb, pinfo, tree);
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break;
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}
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}
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void
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proto_register_dmx(void)
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{
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static hf_register_info hf[] = {
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{ &hf_dmx_start_code,
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{ "Start Code", "dmx.start_code",
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FT_UINT8, BASE_HEX, VALS(dmx_sc_vals), 0x0,
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NULL, HFILL }},
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};
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proto_dmx = proto_register_protocol("DMX", "DMX", "dmx");
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proto_register_field_array(proto_dmx, hf, array_length(hf));
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register_dissector("dmx", dissect_dmx, proto_dmx);
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}
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void
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proto_reg_handoff_dmx(void)
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{
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rdm_handle = find_dissector("rdm");
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dmx_chan_handle = find_dissector("dmx-chan");
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dmx_test_handle = find_dissector("dmx-test");
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dmx_text_handle = find_dissector("dmx-text");
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dmx_sip_handle = find_dissector("dmx-sip");
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data_handle = find_dissector("data");
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}
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/*
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* Editor modelines - http://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 8
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* tab-width: 8
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* indent-tabs-mode: t
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* End:
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*
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* vi: set shiftwidth=8 tabstop=8 noexpandtab:
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* :indentSize=8:tabSize=8:noTabs=false:
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*/
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