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-rw-r--r--epan/dissectors/packet-dvb-nit.c238
1 files changed, 238 insertions, 0 deletions
diff --git a/epan/dissectors/packet-dvb-nit.c b/epan/dissectors/packet-dvb-nit.c
new file mode 100644
index 00000000..b30f128b
--- /dev/null
+++ b/epan/dissectors/packet-dvb-nit.c
@@ -0,0 +1,238 @@
+/* packet-dvb-nit.c
+ * Routines for DVB (ETSI EN 300 468) Network Information Table (NIT) dissection
+ * Copyright 2012, Guy Martin <gmsoft@tuxicoman.be>
+ *
+ * Wireshark - Network traffic analyzer
+ * By Gerald Combs <gerald@wireshark.org>
+ * Copyright 1998 Gerald Combs
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include "config.h"
+
+#include <epan/packet.h>
+#include "packet-mpeg-sect.h"
+#include "packet-mpeg-descriptor.h"
+
+void proto_register_dvb_nit(void);
+void proto_reg_handoff_dvb_nit(void);
+
+static int proto_dvb_nit = -1;
+static int hf_dvb_nit_network_id = -1;
+static int hf_dvb_nit_reserved1 = -1;
+static int hf_dvb_nit_version_number = -1;
+static int hf_dvb_nit_current_next_indicator = -1;
+static int hf_dvb_nit_section_number = -1;
+static int hf_dvb_nit_last_section_number = -1;
+static int hf_dvb_nit_reserved2 = -1;
+
+static int hf_dvb_nit_network_descriptors_length = -1;
+static int hf_dvb_nit_reserved3 = -1;
+static int hf_dvb_nit_transport_stream_loop_length = -1;
+
+static int hf_dvb_nit_transport_stream_id = -1;
+static int hf_dvb_nit_original_network_id = -1;
+static int hf_dvb_nit_reserved4 = -1;
+static int hf_dvb_nit_transport_descriptors_length = -1;
+
+static gint ett_dvb_nit = -1;
+static gint ett_dvb_nit_ts = -1;
+
+static dissector_handle_t dvb_nit_handle;
+
+#define DVB_NIT_RESERVED1_MASK 0xC0
+#define DVB_NIT_VERSION_NUMBER_MASK 0x3E
+#define DVB_NIT_CURRENT_NEXT_INDICATOR_MASK 0x01
+#define DVB_NIT_RESERVED2_MASK 0xF000
+#define DVB_NIT_NETWORK_DESCRIPTORS_LENGTH_MASK 0x0FFF
+#define DVB_NIT_RESERVED3_MASK 0xF000
+#define DVB_NIT_TRANSPORT_STREAM_LOOP_LENGTH_MASK 0x0FFF
+#define DVB_NIT_RESERVED4_MASK 0xF000
+#define DVB_NIT_TRANSPORT_DESCRIPTORS_LENGTH_MASK 0x0FFF
+
+static int
+dissect_dvb_nit(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
+{
+
+ guint offset = 0;
+ guint ts_desc_len, desc_loop_len, ts_end;
+
+ guint16 tsid;
+
+ proto_item *ti;
+ proto_tree *dvb_nit_tree;
+ proto_tree *dvb_nit_ts_tree;
+
+ col_set_str(pinfo->cinfo, COL_INFO, "Network Information Table (NIT)");
+
+ ti = proto_tree_add_item(tree, proto_dvb_nit, tvb, offset, -1, ENC_NA);
+ dvb_nit_tree = proto_item_add_subtree(ti, ett_dvb_nit);
+
+ offset += packet_mpeg_sect_header(tvb, offset, dvb_nit_tree, NULL, NULL);
+
+ proto_tree_add_item(dvb_nit_tree, hf_dvb_nit_network_id, tvb, offset, 2, ENC_BIG_ENDIAN);
+ offset += 2;
+
+ proto_tree_add_item(dvb_nit_tree, hf_dvb_nit_reserved1, tvb, offset, 1, ENC_BIG_ENDIAN);
+ proto_tree_add_item(dvb_nit_tree, hf_dvb_nit_version_number, tvb, offset, 1, ENC_BIG_ENDIAN);
+ proto_tree_add_item(dvb_nit_tree, hf_dvb_nit_current_next_indicator, tvb, offset, 1, ENC_BIG_ENDIAN);
+ offset += 1;
+
+ proto_tree_add_item(dvb_nit_tree, hf_dvb_nit_section_number, tvb, offset, 1, ENC_BIG_ENDIAN);
+ offset += 1;
+
+ proto_tree_add_item(dvb_nit_tree, hf_dvb_nit_last_section_number, tvb, offset, 1, ENC_BIG_ENDIAN);
+ offset += 1;
+
+ proto_tree_add_item(dvb_nit_tree, hf_dvb_nit_reserved2, tvb, offset, 2, ENC_BIG_ENDIAN);
+ proto_tree_add_item(dvb_nit_tree, hf_dvb_nit_network_descriptors_length, tvb, offset, 2, ENC_BIG_ENDIAN);
+ desc_loop_len = tvb_get_ntohs(tvb, offset) & DVB_NIT_NETWORK_DESCRIPTORS_LENGTH_MASK;
+ offset += 2;
+
+ offset += proto_mpeg_descriptor_loop_dissect(tvb, offset, desc_loop_len, dvb_nit_tree);
+
+ proto_tree_add_item(dvb_nit_tree, hf_dvb_nit_reserved3, tvb, offset, 2, ENC_BIG_ENDIAN);
+ proto_tree_add_item(dvb_nit_tree, hf_dvb_nit_transport_stream_loop_length, tvb, offset, 2, ENC_BIG_ENDIAN);
+ ts_end = offset + (tvb_get_ntohs(tvb, offset) & DVB_NIT_TRANSPORT_STREAM_LOOP_LENGTH_MASK);
+ offset += 2;
+
+ while (offset < ts_end) {
+ tsid = tvb_get_ntohs(tvb, offset);
+ ts_desc_len = 3 + (tvb_get_ntohs(tvb, offset + 4) & DVB_NIT_TRANSPORT_DESCRIPTORS_LENGTH_MASK);
+
+ dvb_nit_ts_tree = proto_tree_add_subtree_format(dvb_nit_tree, tvb, offset, ts_desc_len,
+ ett_dvb_nit_ts, NULL, "Stream ID=0x%04hx", tsid);
+
+ proto_tree_add_item(dvb_nit_ts_tree, hf_dvb_nit_transport_stream_id, tvb, offset, 2, ENC_BIG_ENDIAN);
+ offset += 2;
+
+ proto_tree_add_item(dvb_nit_ts_tree, hf_dvb_nit_original_network_id, tvb, offset, 2, ENC_BIG_ENDIAN);
+ offset += 2;
+
+ proto_tree_add_item(dvb_nit_ts_tree, hf_dvb_nit_reserved4, tvb, offset, 2, ENC_BIG_ENDIAN);
+ proto_tree_add_item(dvb_nit_ts_tree, hf_dvb_nit_transport_descriptors_length, tvb, offset, 2, ENC_BIG_ENDIAN);
+ desc_loop_len = tvb_get_ntohs(tvb, offset) & DVB_NIT_TRANSPORT_DESCRIPTORS_LENGTH_MASK;
+ offset += 2;
+
+ offset += proto_mpeg_descriptor_loop_dissect(tvb, offset, desc_loop_len, dvb_nit_ts_tree);
+ }
+
+ offset += packet_mpeg_sect_crc(tvb, pinfo, dvb_nit_tree, 0, offset);
+
+ proto_item_set_len(ti, offset);
+ return offset;
+}
+
+
+void
+proto_register_dvb_nit(void)
+{
+
+ static hf_register_info hf[] = {
+
+ { &hf_dvb_nit_network_id, {
+ "Network ID", "dvb_nit.sid",
+ FT_UINT16, BASE_HEX, NULL, 0, NULL, HFILL
+ } },
+
+ { &hf_dvb_nit_reserved1, {
+ "Reserved", "dvb_nit.reserved1",
+ FT_UINT8, BASE_HEX, NULL, DVB_NIT_RESERVED1_MASK, NULL, HFILL
+ } },
+
+ { &hf_dvb_nit_version_number, {
+ "Version Number", "dvb_nit.version",
+ FT_UINT8, BASE_HEX, NULL, DVB_NIT_VERSION_NUMBER_MASK, NULL, HFILL
+ } },
+
+ { &hf_dvb_nit_current_next_indicator, {
+ "Current/Next Indicator", "dvb_nit.cur_next_ind",
+ FT_BOOLEAN, 8, TFS(&tfs_current_not_yet), DVB_NIT_CURRENT_NEXT_INDICATOR_MASK, NULL, HFILL
+ } },
+
+ { &hf_dvb_nit_section_number, {
+ "Section Number", "dvb_nit.sect_num",
+ FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL
+ } },
+
+ { &hf_dvb_nit_last_section_number, {
+ "Last Section Number", "dvb_nit.last_sect_num",
+ FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL
+ } },
+
+ { &hf_dvb_nit_reserved2, {
+ "Reserved", "dvb_nit.reserved2",
+ FT_UINT16, BASE_HEX, NULL, DVB_NIT_RESERVED2_MASK, NULL, HFILL
+ } },
+
+ { &hf_dvb_nit_network_descriptors_length, {
+ "Network Descriptors Length", "dvb_nit.network_desc_len",
+ FT_UINT16, BASE_DEC, NULL, DVB_NIT_NETWORK_DESCRIPTORS_LENGTH_MASK, NULL, HFILL
+ } },
+
+ { &hf_dvb_nit_reserved3, {
+ "Reserved", "dvb_nit.reserved3",
+ FT_UINT16, BASE_HEX, NULL, DVB_NIT_RESERVED3_MASK, NULL, HFILL
+ } },
+
+ { &hf_dvb_nit_transport_stream_loop_length, {
+ "Transport Stream Loop Length", "dvb_nit.ts_loop_len",
+ FT_UINT16, BASE_DEC, NULL, DVB_NIT_TRANSPORT_STREAM_LOOP_LENGTH_MASK, NULL, HFILL
+ } },
+
+ { &hf_dvb_nit_transport_stream_id, {
+ "Transport Stream ID", "dvb_nit.ts.id",
+ FT_UINT16, BASE_HEX, NULL, 0, NULL, HFILL
+ } },
+
+ { &hf_dvb_nit_original_network_id, {
+ "Original Network ID", "dvb_nit.ts.original_network_id",
+ FT_UINT16, BASE_HEX, NULL, 0, NULL, HFILL
+ } },
+
+ { &hf_dvb_nit_reserved4, {
+ "Reserved", "dvb_nit.ts.reserved",
+ FT_UINT16, BASE_HEX, NULL, DVB_NIT_RESERVED4_MASK, NULL, HFILL
+ } },
+
+ { &hf_dvb_nit_transport_descriptors_length, {
+ "Transport Descriptors Length", "dvb_nit.ts.desc_len",
+ FT_UINT16, BASE_DEC, NULL, DVB_NIT_TRANSPORT_DESCRIPTORS_LENGTH_MASK, NULL, HFILL
+ } },
+
+ };
+
+ static gint *ett[] = {
+ &ett_dvb_nit,
+ &ett_dvb_nit_ts
+ };
+
+ proto_dvb_nit = proto_register_protocol("DVB Network Information Table", "DVB NIT", "dvb_nit");
+
+ proto_register_field_array(proto_dvb_nit, hf, array_length(hf));
+ proto_register_subtree_array(ett, array_length(ett));
+
+ dvb_nit_handle = register_dissector("dvb_nit", dissect_dvb_nit, proto_dvb_nit);
+}
+
+
+void proto_reg_handoff_dvb_nit(void)
+{
+ dissector_add_uint("mpeg_sect.tid", DVB_NIT_TID, dvb_nit_handle);
+ dissector_add_uint("mpeg_sect.tid", DVB_NIT_TID_OTHER, dvb_nit_handle);
+}
+
+
+/*
+ * Editor modelines - https://www.wireshark.org/tools/modelines.html
+ *
+ * Local variables:
+ * c-basic-offset: 4
+ * tab-width: 8
+ * indent-tabs-mode: nil
+ * End:
+ *
+ * vi: set shiftwidth=4 tabstop=8 expandtab:
+ * :indentSize=4:tabSize=8:noTabs=true:
+ */
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