1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
|
/* packet-dmx.c
* DMX packet disassembly.
*
* 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
*/
#include "config.h"
#include <epan/packet.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_register_dmx(void);
void proto_reg_handoff_dmx(void);
static int proto_dmx = -1;
static int hf_dmx_start_code = -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 dissector_handle_t data_handle;
static void
dissect_dmx(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
tvbuff_t *next_tvb;
guint offset = 0;
guint8 start_code;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "DMX");
col_clear(pinfo->cinfo, COL_INFO);
start_code = tvb_get_guint8(tvb, offset);
proto_tree_add_item(tree, hf_dmx_start_code, tvb,
offset, 1, ENC_BIG_ENDIAN);
offset++;
next_tvb = tvb_new_subset_remaining(tvb, offset);
switch (start_code) {
case DMX_SC_DMX:
call_dissector(dmx_chan_handle, next_tvb, pinfo, tree);
break;
case DMX_SC_TEXT:
call_dissector(dmx_text_handle, next_tvb, pinfo, tree);
break;
case DMX_SC_TEST:
call_dissector(dmx_test_handle, next_tvb, pinfo, tree);
break;
case DMX_SC_RDM:
call_dissector(rdm_handle, next_tvb, pinfo, tree);
break;
case DMX_SC_SIP:
call_dissector(dmx_sip_handle, next_tvb, pinfo, tree);
break;
default:
if (offset < tvb_captured_length(tvb))
call_dissector(data_handle, next_tvb, pinfo, tree);
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 }},
};
proto_dmx = proto_register_protocol("DMX", "DMX", "dmx");
proto_register_field_array(proto_dmx, hf, array_length(hf));
register_dissector("dmx", dissect_dmx, proto_dmx);
}
void
proto_reg_handoff_dmx(void)
{
rdm_handle = find_dissector("rdm");
dmx_chan_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");
data_handle = find_dissector("data");
}
|
