1 /* packet-etv.c
2 *
3 * Routines for ETV-AM from OC-SP-ETV-AM1.0-IO5
4 * Copyright 2012, Weston Schmidt <weston_schmidt@alumni.purdue.edu>
5 *
6 * Wireshark - Network traffic analyzer
7 * By Gerald Combs <gerald@wireshark.org>
8 * Copyright 1998 Gerald Combs
9 *
10 * SPDX-License-Identifier: GPL-2.0-or-later
11 */
12
13 #include "config.h"
14
15 #include <epan/packet.h>
16 #include <epan/expert.h>
17 #include "packet-mpeg-sect.h"
18
19 void proto_register_etv(void);
20 void proto_reg_handoff_etv(void);
21
22 static int proto_etv_dii = -1;
23 static int proto_etv_ddb = -1;
24
25 static dissector_handle_t dsmcc_handle;
26
27 static int hf_etv_dii_filter_info = -1;
28 static int hf_etv_dii_reserved = -1;
29
30 static expert_field ei_etv_dii_invalid_section_syntax_indicator = EI_INIT;
31 static expert_field ei_etv_dii_invalid_section_length = EI_INIT;
32 static expert_field ei_etv_dii_invalid_reserved_bits = EI_INIT;
33 static expert_field ei_etv_dii_filter_info = EI_INIT;
34
35 static int hf_etv_ddb_filter_info = -1;
36 static int hf_etv_ddb_reserved = -1;
37
38 static expert_field ei_etv_ddb_invalid_section_syntax_indicator = EI_INIT;
39 static expert_field ei_etv_ddb_invalid_section_length = EI_INIT;
40 static expert_field ei_etv_ddb_invalid_reserved_bits = EI_INIT;
41 static expert_field ei_etv_ddb_filter_info = EI_INIT;
42
43 static gint ett_etv = -1;
44 static gint ett_etv_payload = -1;
45
46 static void
dissect_etv_common(tvbuff_t * tvb,packet_info * pinfo,proto_tree * tree,int proto,int hf_filter_info,int hf_reserved,expert_field * ei_section_syntax_indicator,expert_field * ei_reserved,expert_field * ei_section_length,expert_field * ei_filter_info)47 dissect_etv_common(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int proto,
48 int hf_filter_info, int hf_reserved,
49 expert_field* ei_section_syntax_indicator, expert_field* ei_reserved,
50 expert_field* ei_section_length, expert_field* ei_filter_info)
51 {
52 tvbuff_t *sub_tvb;
53 guint offset = 0;
54 proto_item *ti;
55 proto_item *pi;
56 proto_tree *etv_tree;
57 proto_item *items[PACKET_MPEG_SECT_PI__SIZE];
58 gboolean ssi;
59 guint reserved;
60 guint8 reserved2;
61 guint16 filter_info;
62 guint sect_len;
63
64 ti = proto_tree_add_item(tree, proto, tvb, offset, -1, ENC_NA);
65 etv_tree = proto_item_add_subtree(ti, ett_etv);
66
67 offset += packet_mpeg_sect_header_extra(tvb, offset, etv_tree, §_len,
68 &reserved, &ssi, items);
69
70 if (FALSE != ssi) {
71 proto_item *msg_error;
72 msg_error = items[PACKET_MPEG_SECT_PI__SSI];
73
74 proto_item_set_generated(msg_error);
75 expert_add_info(pinfo, msg_error, ei_section_syntax_indicator);
76 }
77
78 if (4 != reserved) {
79 proto_item *msg_error;
80 msg_error = items[PACKET_MPEG_SECT_PI__RESERVED];
81
82 proto_item_set_generated(msg_error);
83 expert_add_info(pinfo, msg_error, ei_reserved);
84 }
85
86 col_append_fstr(pinfo->cinfo, COL_INFO, ", Length: %u", sect_len);
87 proto_item_append_text(ti, " Length=%u", sect_len);
88 if (1021 < sect_len) {
89 proto_item *msg_error;
90 msg_error = items[PACKET_MPEG_SECT_PI__LENGTH];
91
92 proto_item_set_generated(msg_error);
93 expert_add_info(pinfo, msg_error, ei_section_length);
94 }
95
96 filter_info = tvb_get_ntohs(tvb, offset);
97 col_append_fstr(pinfo->cinfo, COL_INFO, ", Filter: 0x%x", filter_info);
98 proto_item_append_text(ti, " Filter=0x%x", filter_info);
99 pi = proto_tree_add_item(etv_tree, hf_filter_info, tvb, offset, 2, ENC_BIG_ENDIAN);
100 if ((proto_etv_dii == proto) && (0xFBFB != filter_info)) {
101 expert_add_info_format(pinfo, pi, ei_filter_info,
102 "Invalid filter_info value (must be 0xFBFB)");
103 } else if ((proto_etv_ddb == proto) &&
104 ((filter_info < 1) || (0xfbef < filter_info)))
105 {
106 expert_add_info_format(pinfo, pi, ei_filter_info,
107 "Invalid filter_info value (must be [0x0001-0xFBEF] inclusive)");
108 }
109 offset += 2;
110
111 reserved2 = tvb_get_guint8(tvb, offset);
112 pi = proto_tree_add_item(etv_tree, hf_reserved, tvb, offset, 1, ENC_BIG_ENDIAN);
113 if (0 != reserved2) {
114 expert_add_info_format(pinfo, pi, ei_reserved,
115 "Invalid reserved2 bits (should all be 0)");
116 }
117 offset += 1;
118
119 sub_tvb = tvb_new_subset_length(tvb, offset, sect_len-7);
120 call_dissector(dsmcc_handle, sub_tvb, pinfo, tree);
121
122 sect_len += 3 - 4; /* add header, remove crc */
123
124 packet_mpeg_sect_crc(tvb, pinfo, etv_tree, 0, sect_len);
125 }
126
127
128 static int
dissect_etv_ddb(tvbuff_t * tvb,packet_info * pinfo,proto_tree * tree,void * data _U_)129 dissect_etv_ddb(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
130 {
131 col_set_str(pinfo->cinfo, COL_PROTOCOL, "ETV-DDB");
132 col_set_str(pinfo->cinfo, COL_INFO, "ETV DDB");
133
134 dissect_etv_common(tvb, pinfo, tree, proto_etv_ddb, hf_etv_ddb_filter_info,
135 hf_etv_ddb_reserved, &ei_etv_ddb_invalid_section_syntax_indicator,
136 &ei_etv_ddb_invalid_reserved_bits, &ei_etv_ddb_invalid_section_length,
137 &ei_etv_ddb_filter_info);
138 return tvb_captured_length(tvb);
139 }
140
141
142 static int
dissect_etv_dii(tvbuff_t * tvb,packet_info * pinfo,proto_tree * tree,void * data _U_)143 dissect_etv_dii(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
144 {
145 col_set_str(pinfo->cinfo, COL_PROTOCOL, "ETV-DII");
146 col_set_str(pinfo->cinfo, COL_INFO, "ETV DII");
147 dissect_etv_common(tvb, pinfo, tree, proto_etv_dii, hf_etv_dii_filter_info,
148 hf_etv_dii_reserved, &ei_etv_dii_invalid_section_syntax_indicator,
149 &ei_etv_dii_invalid_reserved_bits, &ei_etv_dii_invalid_section_length,
150 &ei_etv_dii_filter_info);
151 return tvb_captured_length(tvb);
152 }
153
154
155 void
proto_register_etv(void)156 proto_register_etv(void)
157 {
158 static hf_register_info hf_ddb[] = {
159 { &hf_etv_ddb_filter_info, {
160 "Filter Info", "etv-ddb.filter_info",
161 FT_UINT16, BASE_HEX, NULL, 0, NULL, HFILL
162 } },
163
164 { &hf_etv_ddb_reserved, {
165 "Reserved", "etv-ddb.reserved",
166 FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL
167 } }
168 };
169
170 static hf_register_info hf_dii[] = {
171 { &hf_etv_dii_filter_info, {
172 "Filter Info", "etv-dii.filter_info",
173 FT_UINT16, BASE_HEX, NULL, 0, NULL, HFILL
174 } },
175
176 { &hf_etv_dii_reserved, {
177 "Reserved", "etv-dii.reserved",
178 FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL
179 } }
180 };
181
182 static gint *ett[] = {
183 &ett_etv,
184 &ett_etv_payload
185 };
186
187 static ei_register_info ei_ddb[] = {
188 { &ei_etv_ddb_invalid_section_syntax_indicator, { "etv-ddb.invalid_section_syntax_indicator", PI_MALFORMED, PI_ERROR, "Invalid section_syntax_indicator (should be 0)", EXPFILL }},
189 { &ei_etv_ddb_invalid_reserved_bits, { "etv-ddb.invalid_reserved_bits", PI_MALFORMED, PI_ERROR, "Invalid reserved bits", EXPFILL }},
190 { &ei_etv_ddb_invalid_section_length, { "etv-ddb.invalid_section_length", PI_MALFORMED, PI_ERROR, "Invalid section_length (must not exceed 1021)", EXPFILL }},
191 { &ei_etv_ddb_filter_info, { "etv-ddb.filter_info.invalid", PI_MALFORMED, PI_ERROR, "Invalid filter info", EXPFILL }},
192 };
193
194 static ei_register_info ei_dii[] = {
195 { &ei_etv_dii_invalid_section_syntax_indicator, { "etv-dii.invalid_section_syntax_indicator", PI_MALFORMED, PI_ERROR, "Invalid section_syntax_indicator (should be 0)", EXPFILL }},
196 { &ei_etv_dii_invalid_reserved_bits, { "etv-dii.invalid_reserved_bits", PI_MALFORMED, PI_ERROR, "Invalid reserved bits", EXPFILL }},
197 { &ei_etv_dii_invalid_section_length, { "etv-dii.invalid_section_length", PI_MALFORMED, PI_ERROR, "Invalid section_length (must not exceed 1021)", EXPFILL }},
198 { &ei_etv_dii_filter_info, { "etv-dii.filter_info.invalid", PI_MALFORMED, PI_ERROR, "Invalid filter info", EXPFILL }},
199 };
200
201 expert_module_t* expert_etv_dii;
202 expert_module_t* expert_etv_ddb;
203
204 proto_etv_dii = proto_register_protocol("ETV-AM DII Section", "ETV-AM DII", "etv-dii");
205 proto_etv_ddb = proto_register_protocol("ETV-AM DDB Section", "ETV-AM DDB", "etv-ddb");
206
207 proto_register_field_array(proto_etv_dii, hf_dii, array_length(hf_dii));
208 proto_register_field_array(proto_etv_ddb, hf_ddb, array_length(hf_ddb));
209 proto_register_subtree_array(ett, array_length(ett));
210 expert_etv_dii = expert_register_protocol(proto_etv_dii);
211 expert_register_field_array(expert_etv_dii, ei_dii, array_length(ei_dii));
212 expert_etv_ddb = expert_register_protocol(proto_etv_ddb);
213 expert_register_field_array(expert_etv_ddb, ei_ddb, array_length(ei_ddb));
214 }
215
216
217 void
proto_reg_handoff_etv(void)218 proto_reg_handoff_etv(void)
219 {
220 dissector_handle_t etv_dii_handle;
221 dissector_handle_t etv_ddb_handle;
222
223 etv_dii_handle = create_dissector_handle(dissect_etv_dii, proto_etv_dii);
224 etv_ddb_handle = create_dissector_handle(dissect_etv_ddb, proto_etv_ddb);
225 dissector_add_uint("mpeg_sect.tid", ETV_TID_DII_SECTION, etv_dii_handle);
226 dissector_add_uint("mpeg_sect.tid", ETV_TID_DDB_SECTION, etv_ddb_handle);
227 dsmcc_handle = find_dissector_add_dependency("mp2t-dsmcc", proto_etv_dii);
228 find_dissector_add_dependency("mp2t-dsmcc", proto_etv_ddb);
229 }
230
231 /*
232 * Editor modelines - https://www.wireshark.org/tools/modelines.html
233 *
234 * Local variables:
235 * c-basic-offset: 8
236 * tab-width: 8
237 * indent-tabs-mode: t
238 * End:
239 *
240 * vi: set shiftwidth=8 tabstop=8 noexpandtab:
241 * :indentSize=8:tabSize=8:noTabs=false:
242 */
243