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-rw-r--r--epan/dissectors/packet-etv.c243
1 files changed, 243 insertions, 0 deletions
diff --git a/epan/dissectors/packet-etv.c b/epan/dissectors/packet-etv.c
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--- /dev/null
+++ b/epan/dissectors/packet-etv.c
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+/* packet-etv.c
+ *
+ * Routines for ETV-AM from OC-SP-ETV-AM1.0-IO5
+ * Copyright 2012, Weston Schmidt <weston_schmidt@alumni.purdue.edu>
+ *
+ * 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 <epan/expert.h>
+#include "packet-mpeg-sect.h"
+
+void proto_register_etv(void);
+void proto_reg_handoff_etv(void);
+
+static dissector_handle_t etv_dii_handle;
+static dissector_handle_t etv_ddb_handle;
+
+static int proto_etv_dii = -1;
+static int proto_etv_ddb = -1;
+
+static dissector_handle_t dsmcc_handle;
+
+static int hf_etv_dii_filter_info = -1;
+static int hf_etv_dii_reserved = -1;
+
+static expert_field ei_etv_dii_invalid_section_syntax_indicator = EI_INIT;
+static expert_field ei_etv_dii_invalid_section_length = EI_INIT;
+static expert_field ei_etv_dii_invalid_reserved_bits = EI_INIT;
+static expert_field ei_etv_dii_filter_info = EI_INIT;
+
+static int hf_etv_ddb_filter_info = -1;
+static int hf_etv_ddb_reserved = -1;
+
+static expert_field ei_etv_ddb_invalid_section_syntax_indicator = EI_INIT;
+static expert_field ei_etv_ddb_invalid_section_length = EI_INIT;
+static expert_field ei_etv_ddb_invalid_reserved_bits = EI_INIT;
+static expert_field ei_etv_ddb_filter_info = EI_INIT;
+
+static gint ett_etv = -1;
+static gint ett_etv_payload = -1;
+
+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)
+{
+ tvbuff_t *sub_tvb;
+ guint offset = 0;
+ proto_item *ti;
+ proto_item *pi;
+ proto_tree *etv_tree;
+ proto_item *items[PACKET_MPEG_SECT_PI__SIZE];
+ gboolean ssi;
+ guint reserved;
+ guint8 reserved2;
+ guint16 filter_info;
+ guint sect_len;
+
+ ti = proto_tree_add_item(tree, proto, tvb, offset, -1, ENC_NA);
+ etv_tree = proto_item_add_subtree(ti, ett_etv);
+
+ offset += packet_mpeg_sect_header_extra(tvb, offset, etv_tree, &sect_len,
+ &reserved, &ssi, items);
+
+ if (FALSE != ssi) {
+ proto_item *msg_error;
+ msg_error = items[PACKET_MPEG_SECT_PI__SSI];
+
+ proto_item_set_generated(msg_error);
+ expert_add_info(pinfo, msg_error, ei_section_syntax_indicator);
+ }
+
+ if (4 != reserved) {
+ proto_item *msg_error;
+ msg_error = items[PACKET_MPEG_SECT_PI__RESERVED];
+
+ proto_item_set_generated(msg_error);
+ expert_add_info(pinfo, msg_error, ei_reserved);
+ }
+
+ col_append_fstr(pinfo->cinfo, COL_INFO, ", Length: %u", sect_len);
+ proto_item_append_text(ti, " Length=%u", sect_len);
+ if (1021 < sect_len) {
+ proto_item *msg_error;
+ msg_error = items[PACKET_MPEG_SECT_PI__LENGTH];
+
+ proto_item_set_generated(msg_error);
+ expert_add_info(pinfo, msg_error, ei_section_length);
+ }
+
+ filter_info = tvb_get_ntohs(tvb, offset);
+ col_append_fstr(pinfo->cinfo, COL_INFO, ", Filter: 0x%x", filter_info);
+ proto_item_append_text(ti, " Filter=0x%x", filter_info);
+ pi = proto_tree_add_item(etv_tree, hf_filter_info, tvb, offset, 2, ENC_BIG_ENDIAN);
+ if ((proto_etv_dii == proto) && (0xFBFB != filter_info)) {
+ expert_add_info_format(pinfo, pi, ei_filter_info,
+ "Invalid filter_info value (must be 0xFBFB)");
+ } else if ((proto_etv_ddb == proto) &&
+ ((filter_info < 1) || (0xfbef < filter_info)))
+ {
+ expert_add_info_format(pinfo, pi, ei_filter_info,
+ "Invalid filter_info value (must be [0x0001-0xFBEF] inclusive)");
+ }
+ offset += 2;
+
+ reserved2 = tvb_get_guint8(tvb, offset);
+ pi = proto_tree_add_item(etv_tree, hf_reserved, tvb, offset, 1, ENC_BIG_ENDIAN);
+ if (0 != reserved2) {
+ expert_add_info_format(pinfo, pi, ei_reserved,
+ "Invalid reserved2 bits (should all be 0)");
+ }
+ offset += 1;
+
+ sub_tvb = tvb_new_subset_length(tvb, offset, sect_len-7);
+ call_dissector(dsmcc_handle, sub_tvb, pinfo, tree);
+
+ sect_len += 3 - 4; /* add header, remove crc */
+
+ packet_mpeg_sect_crc(tvb, pinfo, etv_tree, 0, sect_len);
+}
+
+
+static int
+dissect_etv_ddb(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
+{
+ col_set_str(pinfo->cinfo, COL_PROTOCOL, "ETV-DDB");
+ col_set_str(pinfo->cinfo, COL_INFO, "ETV DDB");
+
+ dissect_etv_common(tvb, pinfo, tree, proto_etv_ddb, hf_etv_ddb_filter_info,
+ hf_etv_ddb_reserved, &ei_etv_ddb_invalid_section_syntax_indicator,
+ &ei_etv_ddb_invalid_reserved_bits, &ei_etv_ddb_invalid_section_length,
+ &ei_etv_ddb_filter_info);
+ return tvb_captured_length(tvb);
+}
+
+
+static int
+dissect_etv_dii(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
+{
+ col_set_str(pinfo->cinfo, COL_PROTOCOL, "ETV-DII");
+ col_set_str(pinfo->cinfo, COL_INFO, "ETV DII");
+ dissect_etv_common(tvb, pinfo, tree, proto_etv_dii, hf_etv_dii_filter_info,
+ hf_etv_dii_reserved, &ei_etv_dii_invalid_section_syntax_indicator,
+ &ei_etv_dii_invalid_reserved_bits, &ei_etv_dii_invalid_section_length,
+ &ei_etv_dii_filter_info);
+ return tvb_captured_length(tvb);
+}
+
+
+void
+proto_register_etv(void)
+{
+ static hf_register_info hf_ddb[] = {
+ { &hf_etv_ddb_filter_info, {
+ "Filter Info", "etv-ddb.filter_info",
+ FT_UINT16, BASE_HEX, NULL, 0, NULL, HFILL
+ } },
+
+ { &hf_etv_ddb_reserved, {
+ "Reserved", "etv-ddb.reserved",
+ FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL
+ } }
+ };
+
+ static hf_register_info hf_dii[] = {
+ { &hf_etv_dii_filter_info, {
+ "Filter Info", "etv-dii.filter_info",
+ FT_UINT16, BASE_HEX, NULL, 0, NULL, HFILL
+ } },
+
+ { &hf_etv_dii_reserved, {
+ "Reserved", "etv-dii.reserved",
+ FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL
+ } }
+ };
+
+ static gint *ett[] = {
+ &ett_etv,
+ &ett_etv_payload
+ };
+
+ static ei_register_info ei_ddb[] = {
+ { &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 }},
+ { &ei_etv_ddb_invalid_reserved_bits, { "etv-ddb.invalid_reserved_bits", PI_MALFORMED, PI_ERROR, "Invalid reserved bits", EXPFILL }},
+ { &ei_etv_ddb_invalid_section_length, { "etv-ddb.invalid_section_length", PI_MALFORMED, PI_ERROR, "Invalid section_length (must not exceed 1021)", EXPFILL }},
+ { &ei_etv_ddb_filter_info, { "etv-ddb.filter_info.invalid", PI_MALFORMED, PI_ERROR, "Invalid filter info", EXPFILL }},
+ };
+
+ static ei_register_info ei_dii[] = {
+ { &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 }},
+ { &ei_etv_dii_invalid_reserved_bits, { "etv-dii.invalid_reserved_bits", PI_MALFORMED, PI_ERROR, "Invalid reserved bits", EXPFILL }},
+ { &ei_etv_dii_invalid_section_length, { "etv-dii.invalid_section_length", PI_MALFORMED, PI_ERROR, "Invalid section_length (must not exceed 1021)", EXPFILL }},
+ { &ei_etv_dii_filter_info, { "etv-dii.filter_info.invalid", PI_MALFORMED, PI_ERROR, "Invalid filter info", EXPFILL }},
+ };
+
+ expert_module_t* expert_etv_dii;
+ expert_module_t* expert_etv_ddb;
+
+ proto_etv_dii = proto_register_protocol("ETV-AM DII Section", "ETV-AM DII", "etv-dii");
+ proto_etv_ddb = proto_register_protocol("ETV-AM DDB Section", "ETV-AM DDB", "etv-ddb");
+
+ proto_register_field_array(proto_etv_dii, hf_dii, array_length(hf_dii));
+ proto_register_field_array(proto_etv_ddb, hf_ddb, array_length(hf_ddb));
+ proto_register_subtree_array(ett, array_length(ett));
+ expert_etv_dii = expert_register_protocol(proto_etv_dii);
+ expert_register_field_array(expert_etv_dii, ei_dii, array_length(ei_dii));
+ expert_etv_ddb = expert_register_protocol(proto_etv_ddb);
+ expert_register_field_array(expert_etv_ddb, ei_ddb, array_length(ei_ddb));
+
+ etv_dii_handle = register_dissector("etv-dii", dissect_etv_dii, proto_etv_dii);
+ etv_ddb_handle = register_dissector("etv-ddb", dissect_etv_ddb, proto_etv_ddb);
+}
+
+
+void
+proto_reg_handoff_etv(void)
+{
+ dissector_add_uint("mpeg_sect.tid", ETV_TID_DII_SECTION, etv_dii_handle);
+ dissector_add_uint("mpeg_sect.tid", ETV_TID_DDB_SECTION, etv_ddb_handle);
+ dsmcc_handle = find_dissector_add_dependency("mp2t-dsmcc", proto_etv_dii);
+ find_dissector_add_dependency("mp2t-dsmcc", proto_etv_ddb);
+}
+
+/*
+ * Editor modelines - https://www.wireshark.org/tools/modelines.html
+ *
+ * Local variables:
+ * c-basic-offset: 8
+ * tab-width: 8
+ * indent-tabs-mode: t
+ * End:
+ *
+ * vi: set shiftwidth=8 tabstop=8 noexpandtab:
+ * :indentSize=8:tabSize=8:noTabs=false:
+ */