epan/dissectors/packet-dvb-nit.c

   1 /* packet-dvb-nit.c
   2  * Routines for DVB (ETSI EN 300 468) Network Information Table (NIT) dissection
   3  * Copyright 2012, Guy Martin <gmsoft@tuxicoman.be>
   4  *
   5  * $Id$
   6  *
   7  * Wireshark - Network traffic analyzer
   8  * By Gerald Combs <gerald@wireshark.org>
   9  * Copyright 1998 Gerald Combs
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License along
  22  * with this program; if not, write to the Free Software Foundation, Inc.,
  23  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  24  */
  25
  26 #include "config.h"
  27
  28 #include <glib.h>
  29
  30 #include <epan/packet.h>
  31 #include <epan/dissectors/packet-mpeg-sect.h>
  32
  33 #include "packet-mpeg-descriptor.h"
  34
  35 void proto_register_dvb_nit(void);
  36 void proto_reg_handoff_dvb_nit(void);
  37
  38 static int proto_dvb_nit = -1;
  39 static int hf_dvb_nit_network_id = -1;
  40 static int hf_dvb_nit_reserved1 = -1;
  41 static int hf_dvb_nit_version_number = -1;
  42 static int hf_dvb_nit_current_next_indicator = -1;
  43 static int hf_dvb_nit_section_number = -1;
  44 static int hf_dvb_nit_last_section_number = -1;
  45 static int hf_dvb_nit_reserved2 = -1;
  46
  47 static int hf_dvb_nit_network_descriptors_length = -1;
  48 static int hf_dvb_nit_reserved3 = -1;
  49 static int hf_dvb_nit_transport_stream_loop_length = -1;
  50
  51 static int hf_dvb_nit_transport_stream_id = -1;
  52 static int hf_dvb_nit_original_network_id = -1;
  53 static int hf_dvb_nit_reserved4 = -1;
  54 static int hf_dvb_nit_transport_descriptors_length = -1;
  55
  56 static gint ett_dvb_nit = -1;
  57 static gint ett_dvb_nit_ts = -1;
  58
  59
  60 #define DVB_NIT_TID             0x40
  61 #define DVB_NIT_TID_OTHER       0x41
  62
  63 #define DVB_NIT_RESERVED1_MASK                            0xC0
  64 #define DVB_NIT_VERSION_NUMBER_MASK                       0x3E
  65 #define DVB_NIT_CURRENT_NEXT_INDICATOR_MASK               0x01
  66 #define DVB_NIT_RESERVED2_MASK                          0xF000
  67 #define DVB_NIT_NETWORK_DESCRIPTORS_LENGTH_MASK         0x0FFF
  68 #define DVB_NIT_RESERVED3_MASK                          0xF000
  69 #define DVB_NIT_TRANSPORT_STREAM_LOOP_LENGTH_MASK       0x0FFF
  70 #define DVB_NIT_RESERVED4_MASK                          0xF000
  71 #define DVB_NIT_TRANSPORT_DESCRIPTORS_LENGTH_MASK       0x0FFF
  72
  73 static const value_string dvb_nit_cur_next_vals[] = {
  74     { 0, "Not yet applicable" },
  75     { 1, "Currently applicable" },
  76
  77     { 0, NULL }
  78 };
  79
  80
  81 static int
  82 dissect_dvb_nit(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
  83 {
  84
  85     guint       offset = 0;
  86     guint       ts_desc_len, desc_loop_len, ts_end;
  87
  88     guint16     tsid;
  89
  90     proto_item *ti;
  91     proto_tree *dvb_nit_tree;
  92     proto_item *tsi;
  93     proto_tree *dvb_nit_ts_tree;
  94
  95     col_set_str(pinfo->cinfo, COL_INFO, "Network Information Table (NIT)");
  96
  97     ti = proto_tree_add_item(tree, proto_dvb_nit, tvb, offset, -1, ENC_NA);
  98     dvb_nit_tree = proto_item_add_subtree(ti, ett_dvb_nit);
  99
 100     offset += packet_mpeg_sect_header(tvb, offset, dvb_nit_tree, NULL, NULL);
 101
 102     proto_tree_add_item(dvb_nit_tree, hf_dvb_nit_network_id,                 tvb, offset, 2, ENC_BIG_ENDIAN);
 103     offset += 2;
 104
 105     proto_tree_add_item(dvb_nit_tree, hf_dvb_nit_reserved1,                  tvb, offset, 1, ENC_BIG_ENDIAN);
 106     proto_tree_add_item(dvb_nit_tree, hf_dvb_nit_version_number,             tvb, offset, 1, ENC_BIG_ENDIAN);
 107     proto_tree_add_item(dvb_nit_tree, hf_dvb_nit_current_next_indicator,     tvb, offset, 1, ENC_BIG_ENDIAN);
 108     offset += 1;
 109
 110     proto_tree_add_item(dvb_nit_tree, hf_dvb_nit_section_number,             tvb, offset, 1, ENC_BIG_ENDIAN);
 111     offset += 1;
 112
 113     proto_tree_add_item(dvb_nit_tree, hf_dvb_nit_last_section_number,        tvb, offset, 1, ENC_BIG_ENDIAN);
 114     offset += 1;
 115
 116     proto_tree_add_item(dvb_nit_tree, hf_dvb_nit_reserved2,                  tvb, offset, 2, ENC_BIG_ENDIAN);
 117     proto_tree_add_item(dvb_nit_tree, hf_dvb_nit_network_descriptors_length, tvb, offset, 2, ENC_BIG_ENDIAN);
 118     desc_loop_len = tvb_get_ntohs(tvb, offset) & DVB_NIT_NETWORK_DESCRIPTORS_LENGTH_MASK;
 119     offset += 2;
 120
 121     offset += proto_mpeg_descriptor_loop_dissect(tvb, offset, desc_loop_len, dvb_nit_tree);
 122
 123     proto_tree_add_item(dvb_nit_tree, hf_dvb_nit_reserved3,                    tvb, offset, 2, ENC_BIG_ENDIAN);
 124     proto_tree_add_item(dvb_nit_tree, hf_dvb_nit_transport_stream_loop_length, tvb, offset, 2, ENC_BIG_ENDIAN);
 125     ts_end = offset + (tvb_get_ntohs(tvb, offset) & DVB_NIT_TRANSPORT_STREAM_LOOP_LENGTH_MASK);
 126     offset += 2;
 127
 128     while (offset < ts_end) {
 129         tsid = tvb_get_ntohs(tvb, offset);
 130         ts_desc_len = 3 + (tvb_get_ntohs(tvb, offset + 4) & DVB_NIT_TRANSPORT_DESCRIPTORS_LENGTH_MASK);
 131
 132         tsi = proto_tree_add_text(dvb_nit_tree, tvb, offset, ts_desc_len, "Stream ID=0x%04hx", tsid);
 133         dvb_nit_ts_tree = proto_item_add_subtree(tsi, ett_dvb_nit_ts);
 134
 135         proto_tree_add_item(dvb_nit_ts_tree, hf_dvb_nit_transport_stream_id, tvb, offset, 2, ENC_BIG_ENDIAN);
 136         offset += 2;
 137
 138         proto_tree_add_item(dvb_nit_ts_tree, hf_dvb_nit_original_network_id, tvb, offset, 2, ENC_BIG_ENDIAN);
 139         offset += 2;
 140
 141         proto_tree_add_item(dvb_nit_ts_tree, hf_dvb_nit_reserved4,                    tvb, offset, 2, ENC_BIG_ENDIAN);
 142         proto_tree_add_item(dvb_nit_ts_tree, hf_dvb_nit_transport_descriptors_length, tvb, offset, 2, ENC_BIG_ENDIAN);
 143         desc_loop_len = tvb_get_ntohs(tvb, offset) & DVB_NIT_TRANSPORT_DESCRIPTORS_LENGTH_MASK;
 144         offset += 2;
 145
 146         offset += proto_mpeg_descriptor_loop_dissect(tvb, offset, desc_loop_len, dvb_nit_ts_tree);
 147     }
 148
 149     offset += packet_mpeg_sect_crc(tvb, pinfo, dvb_nit_tree, 0, offset);
 150
 151     proto_item_set_len(ti, offset);
 152     return offset;
 153 }
 154
 155
 156 void
 157 proto_register_dvb_nit(void)
 158 {
 159
 160     static hf_register_info hf[] = {
 161
 162         { &hf_dvb_nit_network_id, {
 163             "Network ID", "dvb_nit.sid",
 164             FT_UINT16, BASE_HEX, NULL, 0, NULL, HFILL
 165         } },
 166
 167         { &hf_dvb_nit_reserved1, {
 168             "Reserved", "dvb_nit.reserved1",
 169             FT_UINT8, BASE_HEX, NULL, DVB_NIT_RESERVED1_MASK, NULL, HFILL
 170         } },
 171
 172         { &hf_dvb_nit_version_number, {
 173             "Version Number", "dvb_nit.version",
 174             FT_UINT8, BASE_HEX, NULL, DVB_NIT_VERSION_NUMBER_MASK, NULL, HFILL
 175         } },
 176
 177         { &hf_dvb_nit_current_next_indicator, {
 178             "Current/Next Indicator", "dvb_nit.cur_next_ind",
 179             FT_UINT8, BASE_DEC, VALS(dvb_nit_cur_next_vals), DVB_NIT_CURRENT_NEXT_INDICATOR_MASK, NULL, HFILL
 180         } },
 181
 182         { &hf_dvb_nit_section_number, {
 183             "Section Number", "dvb_nit.sect_num",
 184             FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL
 185         } },
 186
 187         { &hf_dvb_nit_last_section_number, {
 188             "Last Section Number", "dvb_nit.last_sect_num",
 189             FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL
 190         } },
 191
 192         { &hf_dvb_nit_reserved2, {
 193             "Reserved", "dvb_nit.reserved2",
 194             FT_UINT16, BASE_HEX, NULL, DVB_NIT_RESERVED2_MASK, NULL, HFILL
 195         } },
 196
 197         { &hf_dvb_nit_network_descriptors_length, {
 198             "Network Descriptors Length", "dvb_nit.network_desc_len",
 199             FT_UINT16, BASE_DEC, NULL, DVB_NIT_NETWORK_DESCRIPTORS_LENGTH_MASK, NULL, HFILL
 200         } },
 201
 202         { &hf_dvb_nit_reserved3, {
 203             "Reserved", "dvb_nit.reserved3",
 204             FT_UINT16, BASE_HEX, NULL, DVB_NIT_RESERVED3_MASK, NULL, HFILL
 205         } },
 206
 207         { &hf_dvb_nit_transport_stream_loop_length, {
 208             "Transport Stream Loop Length", "dvb_nit.ts_loop_len",
 209             FT_UINT16, BASE_DEC, NULL, DVB_NIT_TRANSPORT_STREAM_LOOP_LENGTH_MASK, NULL, HFILL
 210         } },
 211
 212         { &hf_dvb_nit_transport_stream_id, {
 213             "Transport Stream ID", "dvb_nit.ts.id",
 214             FT_UINT16, BASE_HEX, NULL, 0, NULL, HFILL
 215         } },
 216
 217         { &hf_dvb_nit_original_network_id, {
 218             "Original Network ID", "dvb_nit.ts.original_network_id",
 219             FT_UINT16, BASE_HEX, NULL, 0, NULL, HFILL
 220         } },
 221
 222         { &hf_dvb_nit_reserved4, {
 223             "Reserved", "dvb_nit.ts.reserved",
 224             FT_UINT16, BASE_HEX, NULL, DVB_NIT_RESERVED4_MASK, NULL, HFILL
 225         } },
 226
 227         { &hf_dvb_nit_transport_descriptors_length, {
 228             "Transport Descriptors Length", "dvb_nit.ts.desc_len",
 229             FT_UINT16, BASE_DEC, NULL, DVB_NIT_TRANSPORT_DESCRIPTORS_LENGTH_MASK, NULL, HFILL
 230         } },
 231
 232     };
 233
 234     static gint *ett[] = {
 235         &ett_dvb_nit,
 236         &ett_dvb_nit_ts
 237     };
 238
 239     proto_dvb_nit = proto_register_protocol("DVB Network Information Table", "DVB NIT", "dvb_nit");
 240
 241     proto_register_field_array(proto_dvb_nit, hf, array_length(hf));
 242     proto_register_subtree_array(ett, array_length(ett));
 243
 244     new_register_dissector("dvb_nit", dissect_dvb_nit, proto_dvb_nit);
 245 }
 246
 247
 248 void proto_reg_handoff_dvb_nit(void)
 249 {
 250     dissector_handle_t dvb_nit_handle;
 251
 252     dvb_nit_handle = find_dissector("dvb_nit");
 253
 254     dissector_add_uint("mpeg_sect.tid", DVB_NIT_TID, dvb_nit_handle);
 255     dissector_add_uint("mpeg_sect.tid", DVB_NIT_TID_OTHER, dvb_nit_handle);
 256 }
 257
 258
 259 /*
 260  * Editor modelines  -  http://www.wireshark.org/tools/modelines.html
 261  *
 262  * Local variables:
 263  * c-basic-offset: 4
 264  * tab-width: 8
 265  * indent-tabs-mode: nil
 266  * End:
 267  *
 268  * vi: set shiftwidth=4 tabstop=8 expandtab:
 269  * :indentSize=4:tabSize=8:noTabs=true:
 270  */