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-rw-r--r--epan/dissectors/packet-dvb-sit.c233
1 files changed, 233 insertions, 0 deletions
diff --git a/epan/dissectors/packet-dvb-sit.c b/epan/dissectors/packet-dvb-sit.c
new file mode 100644
index 00000000..26b50ead
--- /dev/null
+++ b/epan/dissectors/packet-dvb-sit.c
@@ -0,0 +1,233 @@
+/* packet-dvb-sit.c
+ * Routines for DVB (ETSI EN 300 468) Selection Information Table (SIT) dissection
+ * Copyright 2021, Roman Volkov <volkoff_roman@ukr.net>
+ *
+ * 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_sit(void);
+void proto_reg_handoff_dvb_sit(void);
+
+static dissector_handle_t dvb_sit_handle;
+
+static int proto_dvb_sit = -1;
+
+static int hf_dvb_sit_reserved_future_use1 = -1;
+static int hf_dvb_sit_reserved = -1;
+static int hf_dvb_sit_version_number = -1;
+static int hf_dvb_sit_current_next_indicator = -1;
+static int hf_dvb_sit_section_number = -1;
+static int hf_dvb_sit_last_section_number = -1;
+static int hf_dvb_sit_reserved_future_use2 = -1;
+static int hf_dvb_sit_transmission_info_len = -1;
+static int hf_dvb_sit_service_id = -1;
+static int hf_dvb_sit_reserved_future_use3 = -1;
+static int hf_dvb_sit_running_status = -1;
+static int hf_dvb_sit_service_descriptors_length = -1;
+
+static gint ett_dvb_sit = -1;
+static gint ett_dvb_sit_service = -1;
+
+#define DVB_SIT_RESERVED_MASK 0xC0
+#define DVB_SIT_VERSION_NUMBER_MASK 0x3E
+#define DVB_SIT_CURRENT_NEXT_INDICATOR_MASK 0x01
+
+#define DVB_SIT_RESERVED_FUTURE_USE2_MASK 0xF000
+#define DVB_SIT_TRANSMISSION_INFO_MASK 0x0FFF
+
+#define DVB_SIT_RESERVED_FUTURE_USE3_MASK 0x8000
+#define DVB_SIT_RUNNING_STATUS_MASK 0x7000
+#define DVB_SIT_SERVICE_DESCRIPTORS_LENGTH_MASK 0x0FFF
+
+static const value_string dvb_sit_running_status_vals[] = {
+ { 0, "Undefined" },
+ { 1, "Not Running" },
+ { 2, "Starts in a few seconds" },
+ { 3, "Pausing" },
+ { 4, "Running" },
+ { 5, "Service off-air" },
+
+ { 0, NULL }
+};
+
+static int
+dissect_dvb_sit(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
+{
+
+ guint offset = 0, length = 0;
+ guint descriptor_len;
+ guint16 svc_id;
+
+ proto_item *ti;
+ proto_tree *dvb_sit_tree;
+ proto_tree *dvb_sit_service_tree;
+
+ /* The TVB should start right after the section_length in the Section packet */
+
+ col_set_str(pinfo->cinfo, COL_INFO, "Selection Information Table (SIT)");
+
+ ti = proto_tree_add_item(tree, proto_dvb_sit, tvb, offset, -1, ENC_NA);
+ dvb_sit_tree = proto_item_add_subtree(ti, ett_dvb_sit);
+
+ offset += packet_mpeg_sect_header(tvb, offset, dvb_sit_tree, &length, NULL);
+ length -= 4;
+
+ proto_tree_add_item(dvb_sit_tree, hf_dvb_sit_reserved_future_use1, tvb, offset, 2, ENC_BIG_ENDIAN);
+ offset += 2;
+
+ proto_tree_add_item(dvb_sit_tree, hf_dvb_sit_reserved, tvb, offset, 1, ENC_BIG_ENDIAN);
+ proto_tree_add_item(dvb_sit_tree, hf_dvb_sit_version_number, tvb, offset, 1, ENC_BIG_ENDIAN);
+ proto_tree_add_item(dvb_sit_tree, hf_dvb_sit_current_next_indicator, tvb, offset, 1, ENC_BIG_ENDIAN);
+ offset += 1;
+
+ proto_tree_add_item(dvb_sit_tree, hf_dvb_sit_section_number, tvb, offset, 1, ENC_BIG_ENDIAN);
+ offset += 1;
+
+ proto_tree_add_item(dvb_sit_tree, hf_dvb_sit_last_section_number, tvb, offset, 1, ENC_BIG_ENDIAN);
+ offset += 1;
+
+ descriptor_len = tvb_get_ntohs(tvb, offset) & DVB_SIT_TRANSMISSION_INFO_MASK;
+ proto_tree_add_item(dvb_sit_tree, hf_dvb_sit_reserved_future_use2, tvb, offset, 2, ENC_BIG_ENDIAN);
+ proto_tree_add_item(dvb_sit_tree, hf_dvb_sit_transmission_info_len, tvb, offset, 2, ENC_BIG_ENDIAN);
+ offset += 2;
+
+ offset += proto_mpeg_descriptor_loop_dissect(tvb, offset, descriptor_len, dvb_sit_tree);
+
+ if (offset >= length)
+ return offset;
+
+ /* Parse all the services */
+ while (offset < length) {
+
+ svc_id = tvb_get_ntohs(tvb, offset);
+ dvb_sit_service_tree = proto_tree_add_subtree_format(dvb_sit_tree, tvb, offset, 5,
+ ett_dvb_sit_service, NULL, "Service 0x%04hx", svc_id);
+
+ proto_tree_add_item(dvb_sit_service_tree, hf_dvb_sit_service_id, tvb, offset, 2, ENC_BIG_ENDIAN);
+ offset += 2;
+
+ proto_tree_add_item(dvb_sit_service_tree, hf_dvb_sit_reserved_future_use3, tvb, offset, 2, ENC_BIG_ENDIAN);
+ proto_tree_add_item(dvb_sit_service_tree, hf_dvb_sit_running_status, tvb, offset, 2, ENC_BIG_ENDIAN);
+ proto_tree_add_item(dvb_sit_service_tree, hf_dvb_sit_service_descriptors_length, tvb, offset, 2, ENC_BIG_ENDIAN);
+ descriptor_len = tvb_get_ntohs(tvb, offset) & DVB_SIT_SERVICE_DESCRIPTORS_LENGTH_MASK;
+ offset += 2;
+
+ offset += proto_mpeg_descriptor_loop_dissect(tvb, offset, descriptor_len, dvb_sit_service_tree);
+ }
+
+ offset += packet_mpeg_sect_crc(tvb, pinfo, dvb_sit_tree, 0, offset);
+ proto_item_set_len(ti, offset);
+ return tvb_captured_length(tvb);
+}
+
+
+void
+proto_register_dvb_sit(void)
+{
+
+ static hf_register_info hf[] = {
+
+ { &hf_dvb_sit_reserved_future_use1, {
+ "Reserved", "dvb_sit.reserved_future_use1",
+ FT_UINT16, BASE_HEX, NULL, 0, NULL, HFILL
+ } },
+
+ { &hf_dvb_sit_reserved, {
+ "Reserved", "dvb_sit.reserved",
+ FT_UINT8, BASE_HEX, NULL, DVB_SIT_RESERVED_MASK, NULL, HFILL
+ } },
+
+ { &hf_dvb_sit_version_number, {
+ "Version Number", "dvb_sit.version",
+ FT_UINT8, BASE_HEX, NULL, DVB_SIT_VERSION_NUMBER_MASK, NULL, HFILL
+ } },
+
+ { &hf_dvb_sit_current_next_indicator, {
+ "Current/Next Indicator", "dvb_sit.cur_next_ind",
+ FT_BOOLEAN, 8, TFS(&tfs_current_not_yet), DVB_SIT_CURRENT_NEXT_INDICATOR_MASK, NULL, HFILL
+ } },
+
+ { &hf_dvb_sit_section_number, {
+ "Section Number", "dvb_sit.sect_num",
+ FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL
+ } },
+
+ { &hf_dvb_sit_last_section_number, {
+ "Last Section Number", "dvb_sit.last_sect_num",
+ FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL
+ } },
+
+ { &hf_dvb_sit_reserved_future_use2, {
+ "Reserved", "dvb_sit.reserved_future_use2",
+ FT_UINT16, BASE_HEX, NULL, DVB_SIT_RESERVED_FUTURE_USE2_MASK, NULL, HFILL
+ } },
+
+ { &hf_dvb_sit_transmission_info_len, {
+ "Transmission Info Descriptors Length", "dvb_sit.transmission_info_descriptors_length",
+ FT_UINT16, BASE_DEC, NULL, DVB_SIT_TRANSMISSION_INFO_MASK, NULL, HFILL
+ } },
+
+ { &hf_dvb_sit_service_id, {
+ "Service ID", "dvb_sit.svc.id",
+ FT_UINT16, BASE_HEX, NULL, 0, NULL, HFILL
+ } },
+
+ { &hf_dvb_sit_reserved_future_use3, {
+ "Reserved", "dvb_sit.svc.reserved_future_use3",
+ FT_UINT16, BASE_HEX, NULL, DVB_SIT_RESERVED_FUTURE_USE3_MASK, NULL, HFILL
+ } },
+
+ { &hf_dvb_sit_running_status, {
+ "Running Status", "dvb_sit.svc.running_status",
+ FT_UINT16, BASE_HEX, VALS(dvb_sit_running_status_vals), DVB_SIT_RUNNING_STATUS_MASK, NULL, HFILL
+ } },
+
+ { &hf_dvb_sit_service_descriptors_length, {
+ "Service Descriptors Length", "dvb_sit.svc.service_descriptors_length",
+ FT_UINT16, BASE_DEC, NULL, DVB_SIT_SERVICE_DESCRIPTORS_LENGTH_MASK, NULL, HFILL
+ } }
+
+ };
+
+ static gint *ett[] = {
+ &ett_dvb_sit,
+ &ett_dvb_sit_service
+ };
+
+ proto_dvb_sit = proto_register_protocol("DVB Selection Information Table", "DVB SIT", "dvb_sit");
+ dvb_sit_handle = register_dissector("dvb_sit", dissect_dvb_sit, proto_dvb_sit);
+
+ proto_register_field_array(proto_dvb_sit, hf, array_length(hf));
+ proto_register_subtree_array(ett, array_length(ett));
+
+}
+
+
+void proto_reg_handoff_dvb_sit(void)
+{
+ dissector_add_uint("mpeg_sect.tid", DVB_SIT_TID, dvb_sit_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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