epan/dissectors/packet-dvb-bat.c

   1 /* packet-dvb-bat.c
   2  * Routines for DVB (ETSI EN 300 468) Bouquet Association Table (BAT) dissection
   3  * Copyright 2012, Guy Martin <gmsoft@tuxicoman.be>
   4  *
   5  * Wireshark - Network traffic analyzer
   6  * By Gerald Combs <gerald@wireshark.org>
   7  * Copyright 1998 Gerald Combs
   8  *
   9  * SPDX-License-Identifier: GPL-2.0-or-later
  10  */
  11
  12 #include "config.h"
  13
  14 #include <epan/packet.h>
  15 #include <epan/tfs.h>
  16 #include "packet-mpeg-sect.h"
  17 #include "packet-mpeg-descriptor.h"
  18
  19 void proto_register_dvb_bat(void);
  20 void proto_reg_handoff_dvb_bat(void);
  21
  22 static dissector_handle_t dvb_bat_handle;
  23
  24 static int proto_dvb_bat;
  25 static int hf_dvb_bat_bouquet_id;
  26 static int hf_dvb_bat_reserved1;
  27 static int hf_dvb_bat_version_number;
  28 static int hf_dvb_bat_current_next_indicator;
  29 static int hf_dvb_bat_section_number;
  30 static int hf_dvb_bat_last_section_number;
  31
  32 static int hf_dvb_bat_reserved2;
  33 static int hf_dvb_bat_bouquet_descriptors_length;
  34
  35 static int hf_dvb_bat_reserved3;
  36 static int hf_dvb_bat_transport_stream_loop_length;
  37
  38 static int hf_dvb_bat_transport_stream_id;
  39 static int hf_dvb_bat_original_network_id;
  40 static int hf_dvb_bat_reserved4;
  41 static int hf_dvb_bat_transport_descriptors_length;
  42
  43 static int ett_dvb_bat;
  44 static int ett_dvb_bat_transport_stream;
  45
  46
  47 #define DVB_BAT_RESERVED1_MASK                      0xC0
  48 #define DVB_BAT_VERSION_NUMBER_MASK                 0x3E
  49 #define DVB_BAT_CURRENT_NEXT_INDICATOR_MASK         0x01
  50
  51 #define DVB_BAT_RESERVED2_MASK                    0xF000
  52 #define DVB_BAT_BOUQUET_DESCRIPTORS_LENGTH_MASK   0x0FFF
  53
  54 #define DVB_BAT_RESERVED3_MASK                    0xF000
  55 #define DVB_BAT_TRANSPORT_STREAM_LOOP_LENGTH_MASK 0x0FFF
  56
  57 #define DVB_BAT_RESERVED4_MASK                    0xF000
  58 #define DVB_BAT_TRANSPORT_DESCRIPTORS_LENGTH_MASK 0x0FFF
  59
  60 #if 0
  61 static const value_string dvb_bat_running_status_vals[] = {
  62     { 0, "Undefined" },
  63     { 1, "Not Running" },
  64     { 2, "Starts in a few seconds" },
  65     { 3, "Pausing" },
  66     { 4, "Running" },
  67     { 5, "Service off-air" },
  68
  69     { 0, NULL }
  70 };
  71
  72 static const value_string dvb_bat_free_ca_mode_vals[] = {
  73     { 0, "Not Scrambled" },
  74     { 1, "One or more component scrambled" },
  75
  76     { 0, NULL }
  77 };
  78 #endif
  79
  80 static int
  81 dissect_dvb_bat(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
  82 {
  83
  84     unsigned   offset = 0, length = 0, ts_loop_end;
  85     uint16_t ts_id, descriptor_len, ts_loop_len;
  86
  87     proto_item *ti;
  88     proto_tree *dvb_bat_tree;
  89     proto_tree *transport_stream_tree;
  90
  91     col_set_str(pinfo->cinfo, COL_INFO, "Bouquet Association Table (BAT)");
  92
  93     ti = proto_tree_add_item(tree, proto_dvb_bat,                              tvb, offset, -1, ENC_NA);
  94     dvb_bat_tree = proto_item_add_subtree(ti, ett_dvb_bat);
  95
  96     offset += packet_mpeg_sect_header(tvb, offset, dvb_bat_tree, &length, NULL);
  97     length -= 4;
  98
  99     proto_tree_add_item(dvb_bat_tree, hf_dvb_bat_bouquet_id,                   tvb, offset, 2, ENC_BIG_ENDIAN);
 100     offset += 2;
 101
 102     proto_tree_add_item(dvb_bat_tree, hf_dvb_bat_reserved1,                    tvb, offset, 1, ENC_BIG_ENDIAN);
 103     proto_tree_add_item(dvb_bat_tree, hf_dvb_bat_version_number,               tvb, offset, 1, ENC_BIG_ENDIAN);
 104     proto_tree_add_item(dvb_bat_tree, hf_dvb_bat_current_next_indicator,       tvb, offset, 1, ENC_BIG_ENDIAN);
 105     offset += 1;
 106
 107     proto_tree_add_item(dvb_bat_tree, hf_dvb_bat_section_number,               tvb, offset, 1, ENC_BIG_ENDIAN);
 108     offset += 1;
 109
 110     proto_tree_add_item(dvb_bat_tree, hf_dvb_bat_last_section_number,          tvb, offset, 1, ENC_BIG_ENDIAN);
 111     offset += 1;
 112
 113     descriptor_len = tvb_get_ntohs(tvb, offset) & DVB_BAT_BOUQUET_DESCRIPTORS_LENGTH_MASK;
 114     proto_tree_add_item(dvb_bat_tree, hf_dvb_bat_reserved2,                    tvb, offset, 2, ENC_BIG_ENDIAN);
 115     proto_tree_add_item(dvb_bat_tree, hf_dvb_bat_bouquet_descriptors_length,   tvb, offset, 2, ENC_BIG_ENDIAN);
 116     offset += 2;
 117
 118     offset += proto_mpeg_descriptor_loop_dissect(tvb, offset, descriptor_len, dvb_bat_tree);
 119
 120     ts_loop_len = tvb_get_ntohs(tvb, offset) & DVB_BAT_TRANSPORT_STREAM_LOOP_LENGTH_MASK;
 121     proto_tree_add_item(dvb_bat_tree, hf_dvb_bat_reserved3,                    tvb, offset, 2, ENC_BIG_ENDIAN);
 122     proto_tree_add_item(dvb_bat_tree, hf_dvb_bat_transport_stream_loop_length, tvb, offset, 2, ENC_BIG_ENDIAN);
 123     offset += 2;
 124
 125     ts_loop_end = offset + ts_loop_len;
 126     while (offset < ts_loop_end) {
 127         ts_id = tvb_get_ntohs(tvb, offset);
 128         descriptor_len = tvb_get_ntohs(tvb, offset + 4) & DVB_BAT_TRANSPORT_DESCRIPTORS_LENGTH_MASK;
 129
 130         transport_stream_tree = proto_tree_add_subtree_format(dvb_bat_tree, tvb, offset, 6 + descriptor_len,
 131             ett_dvb_bat_transport_stream, NULL, "Transport Stream 0x%04x", ts_id);
 132
 133         proto_tree_add_item(transport_stream_tree, hf_dvb_bat_transport_stream_id, tvb, offset, 2, ENC_BIG_ENDIAN);
 134         offset += 2;
 135
 136         proto_tree_add_item(transport_stream_tree, hf_dvb_bat_original_network_id, tvb, offset, 2, ENC_BIG_ENDIAN);
 137         offset += 2;
 138
 139         proto_tree_add_item(transport_stream_tree, hf_dvb_bat_reserved4, tvb, offset, 2, ENC_BIG_ENDIAN);
 140         proto_tree_add_item(transport_stream_tree, hf_dvb_bat_transport_descriptors_length, tvb, offset, 2, ENC_BIG_ENDIAN);
 141         offset += 2;
 142
 143         offset += proto_mpeg_descriptor_loop_dissect(tvb, offset, descriptor_len, transport_stream_tree);
 144     }
 145
 146     offset += packet_mpeg_sect_crc(tvb, pinfo, dvb_bat_tree, 0, offset);
 147     proto_item_set_len(ti, offset);
 148     return tvb_captured_length(tvb);
 149 }
 150
 151
 152 void
 153 proto_register_dvb_bat(void)
 154 {
 155
 156     static hf_register_info hf[] = {
 157
 158         { &hf_dvb_bat_bouquet_id, {
 159             "Bouquet ID", "dvb_bat.bouquet_id",
 160             FT_UINT16, BASE_HEX, NULL, 0, NULL, HFILL
 161         } },
 162
 163         { &hf_dvb_bat_reserved1, {
 164             "Reserved", "dvb_bat.reserved1",
 165             FT_UINT8, BASE_HEX, NULL, DVB_BAT_RESERVED1_MASK, NULL, HFILL
 166         } },
 167
 168         { &hf_dvb_bat_version_number, {
 169             "Version Number", "dvb_bat.version",
 170             FT_UINT8, BASE_HEX, NULL, DVB_BAT_VERSION_NUMBER_MASK, NULL, HFILL
 171         } },
 172
 173         { &hf_dvb_bat_current_next_indicator, {
 174             "Current/Next Indicator", "dvb_bat.cur_next_ind",
 175             FT_BOOLEAN, 8, TFS(&tfs_current_not_yet), DVB_BAT_CURRENT_NEXT_INDICATOR_MASK, NULL, HFILL
 176         } },
 177
 178         { &hf_dvb_bat_section_number, {
 179             "Section Number", "dvb_bat.sect_num",
 180             FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL
 181         } },
 182
 183         { &hf_dvb_bat_last_section_number, {
 184             "Last Section Number", "dvb_bat.last_sect_num",
 185             FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL
 186         } },
 187
 188         { &hf_dvb_bat_reserved2, {
 189             "Reserved", "dvb_bat.reserved2",
 190             FT_UINT16, BASE_HEX, NULL, DVB_BAT_RESERVED2_MASK, NULL, HFILL
 191         } },
 192
 193         { &hf_dvb_bat_bouquet_descriptors_length, {
 194             "Bouquet Descriptors Length", "dvb_bat.bouquet_desc_len",
 195             FT_UINT16, BASE_DEC, NULL, DVB_BAT_BOUQUET_DESCRIPTORS_LENGTH_MASK, NULL, HFILL
 196         } },
 197
 198         { &hf_dvb_bat_reserved3, {
 199             "Reserved", "dvb_bat.reserved3",
 200             FT_UINT16, BASE_HEX, NULL, DVB_BAT_RESERVED3_MASK, NULL, HFILL
 201         } },
 202
 203         { &hf_dvb_bat_transport_stream_loop_length, {
 204             "Transport Stream Loop Length", "dvb_bat.ts_loop_len",
 205             FT_UINT16, BASE_DEC, NULL, DVB_BAT_TRANSPORT_STREAM_LOOP_LENGTH_MASK, NULL, HFILL
 206         } },
 207
 208         { &hf_dvb_bat_transport_stream_id, {
 209             "Transport Stream ID", "dvb_bat.ts.id",
 210             FT_UINT16, BASE_HEX, NULL, 0, NULL, HFILL
 211         } },
 212
 213         { &hf_dvb_bat_original_network_id, {
 214             "Original Network ID", "dvb_bat.ts.original_nid",
 215             FT_UINT16, BASE_HEX, NULL, 0, NULL, HFILL
 216         } },
 217
 218         { &hf_dvb_bat_reserved4, {
 219             "Reserved", "dvb_bat.ts.reserved",
 220             FT_UINT16, BASE_HEX, NULL, DVB_BAT_RESERVED4_MASK, NULL, HFILL
 221         } },
 222
 223         { &hf_dvb_bat_transport_descriptors_length, {
 224             "Bouquet Descriptors Length", "dvb_bat.ts.desc_len",
 225             FT_UINT16, BASE_DEC, NULL, DVB_BAT_BOUQUET_DESCRIPTORS_LENGTH_MASK, NULL, HFILL
 226         } },
 227
 228     };
 229
 230     static int *ett[] = {
 231         &ett_dvb_bat,
 232         &ett_dvb_bat_transport_stream
 233     };
 234
 235     proto_dvb_bat = proto_register_protocol("DVB Bouquet Association Table", "DVB BAT", "dvb_bat");
 236     dvb_bat_handle = register_dissector("dvb_bat", dissect_dvb_bat, proto_dvb_bat);
 237
 238     proto_register_field_array(proto_dvb_bat, hf, array_length(hf));
 239     proto_register_subtree_array(ett, array_length(ett));
 240
 241 }
 242
 243
 244 void proto_reg_handoff_dvb_bat(void)
 245 {
 246     dissector_add_uint("mpeg_sect.tid", DVB_BAT_TID, dvb_bat_handle);
 247 }
 248
 249 /*
 250  * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
 251  *
 252  * Local variables:
 253  * c-basic-offset: 4
 254  * tab-width: 8
 255  * indent-tabs-mode: nil
 256  * End:
 257  *
 258  * vi: set shiftwidth=4 tabstop=8 expandtab:
 259  * :indentSize=4:tabSize=8:noTabs=true:
 260  */