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Diffstat (limited to 'epan/dissectors/packet-dmx.c')
| -rw-r--r-- | epan/dissectors/packet-dmx.c | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/epan/dissectors/packet-dmx.c b/epan/dissectors/packet-dmx.c new file mode 100644 index 0000000000..f3e67cdbb6 --- /dev/null +++ b/epan/dissectors/packet-dmx.c @@ -0,0 +1,169 @@ +/* packet-dmx.c + * DMX packet disassembly. + * + * $Id: $ + * + * This dissector is written by + * + * Erwin Rol <erwin@erwinrol.com> + * Copyright 2012 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 + */ + + +#ifdef HAVE_CONFIG_H +# include "config.h" +#endif + +#include <stdlib.h> +#include <ctype.h> +#include <time.h> +#include <string.h> +#include <epan/packet.h> +#include <epan/addr_resolv.h> +#include <epan/prefs.h> +#include <epan/strutil.h> + +#define DMX_SC_DMX 0x00 +#define DMX_SC_TEXT 0x17 +#define DMX_SC_TEST 0x55 +#define DMX_SC_RDM 0xCC +#define DMX_SC_SIP 0xCF + +static const value_string dmx_sc_vals[] = { + { DMX_SC_DMX, "DMX" }, + { DMX_SC_TEXT, "Text" }, + { DMX_SC_TEST, "Test" }, + { DMX_SC_RDM, "RDM" }, + { DMX_SC_SIP, "SIP" }, + { 0, NULL }, +}; + +void proto_reg_handoff_dmx(void); + +static int proto_dmx = -1; + +static int hf_dmx_start_code = -1; +static int hf_dmx_frame_data = -1; + +static int ett_dmx = -1; + +static dissector_handle_t rdm_handle; +static dissector_handle_t dmx_chan_handle; +static dissector_handle_t dmx_test_handle; +static dissector_handle_t dmx_text_handle; +static dissector_handle_t dmx_sip_handle; + + +static void +dissect_dmx(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) +{ + tvbuff_t *next_tvb = NULL; + + col_set_str(pinfo->cinfo, COL_PROTOCOL, "DMX"); + col_clear(pinfo->cinfo, COL_INFO); + + if (tree != NULL) { + unsigned offset = 0; + guint8 start_code; + + start_code = tvb_get_guint8(tvb, offset); + proto_tree_add_item(tree, hf_dmx_start_code, tvb, + offset, 1, ENC_BIG_ENDIAN); + offset++; + + switch (start_code) { + case DMX_SC_DMX: + next_tvb = tvb_new_subset_remaining(tvb, offset); + call_dissector(dmx_chan_handle, next_tvb, pinfo, tree); + break; + case DMX_SC_TEXT: + next_tvb = tvb_new_subset_remaining(tvb, offset); + call_dissector(dmx_text_handle, next_tvb, pinfo, tree); + break; + case DMX_SC_TEST: + next_tvb = tvb_new_subset_remaining(tvb, offset); + call_dissector(dmx_test_handle, next_tvb, pinfo, tree); + break; + case DMX_SC_RDM: + next_tvb = tvb_new_subset_remaining(tvb, offset); + call_dissector(rdm_handle, next_tvb, pinfo, tree); + break; + case DMX_SC_SIP: + next_tvb = tvb_new_subset_remaining(tvb, offset); + call_dissector(dmx_sip_handle, next_tvb, pinfo, tree); + break; + default: + if (offset < tvb_length(tvb)) + proto_tree_add_item(tree, hf_dmx_frame_data, tvb, + offset, -1, ENC_NA); + break; + } + } +} + +void +proto_register_dmx(void) +{ + static hf_register_info hf[] = { + { &hf_dmx_start_code, + { "Start Code", "dmx.start_code", + FT_UINT8, BASE_HEX, VALS(dmx_sc_vals), 0x0, + NULL, HFILL }}, + { &hf_dmx_frame_data, + { "Frame Data", "dmx.frame_data", + FT_BYTES, BASE_NONE, NULL, 0x0, + NULL, HFILL }}, + }; + + static gint *ett[] = { + &ett_dmx + }; + + proto_dmx = proto_register_protocol("DMX", "DMX", "dmx"); + proto_register_field_array(proto_dmx, hf, array_length(hf)); + proto_register_subtree_array(ett, array_length(ett)); +} + +void +proto_reg_handoff_dmx(void) +{ + static gboolean dmx_initialized = FALSE; + static dissector_handle_t dmx_handle; + + if (!dmx_initialized) { + dmx_handle = create_dissector_handle(dissect_dmx, proto_dmx); + rdm_handle = find_dissector("rdm"); + dmx_test_handle = find_dissector("dmx-chan"); + dmx_test_handle = find_dissector("dmx-test"); + dmx_text_handle = find_dissector("dmx-text"); + dmx_sip_handle = find_dissector("dmx-sip"); + dmx_initialized = TRUE; + } +} |