diff options
Diffstat (limited to 'epan/dissectors/packet-etv.c')
-rw-r--r-- | epan/dissectors/packet-etv.c | 243 |
1 files changed, 243 insertions, 0 deletions
diff --git a/epan/dissectors/packet-etv.c b/epan/dissectors/packet-etv.c new file mode 100644 index 00000000..22fbfa4a --- /dev/null +++ b/epan/dissectors/packet-etv.c @@ -0,0 +1,243 @@ +/* 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, §_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: + */ |