forked from osmocom/wireshark
![Dario Lombardo](/assets/img/avatar_default.png)
Change-Id: I92c94448e6641716d03158a5f332c8b53709423a Reviewed-on: https://code.wireshark.org/review/25756 Petri-Dish: Dario Lombardo <lomato@gmail.com> Reviewed-by: Anders Broman <a.broman58@gmail.com>
243 lines
8.2 KiB
C
243 lines
8.2 KiB
C
/* packet-etv.c
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*
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* Routines for ETV-AM from OC-SP-ETV-AM1.0-IO5
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* Copyright 2012, Weston Schmidt <weston_schmidt@alumni.purdue.edu>
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "config.h"
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#include <epan/packet.h>
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#include <epan/expert.h>
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#include "packet-mpeg-sect.h"
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void proto_register_etv(void);
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void proto_reg_handoff_etv(void);
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static int proto_etv_dii = -1;
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static int proto_etv_ddb = -1;
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static dissector_handle_t dsmcc_handle;
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static int hf_etv_dii_filter_info = -1;
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static int hf_etv_dii_reserved = -1;
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static expert_field ei_etv_dii_invalid_section_syntax_indicator = EI_INIT;
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static expert_field ei_etv_dii_invalid_section_length = EI_INIT;
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static expert_field ei_etv_dii_invalid_reserved_bits = EI_INIT;
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static expert_field ei_etv_dii_filter_info = EI_INIT;
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static int hf_etv_ddb_filter_info = -1;
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static int hf_etv_ddb_reserved = -1;
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static expert_field ei_etv_ddb_invalid_section_syntax_indicator = EI_INIT;
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static expert_field ei_etv_ddb_invalid_section_length = EI_INIT;
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static expert_field ei_etv_ddb_invalid_reserved_bits = EI_INIT;
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static expert_field ei_etv_ddb_filter_info = EI_INIT;
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static gint ett_etv = -1;
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static gint ett_etv_payload = -1;
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static void
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dissect_etv_common(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int proto,
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int hf_filter_info, int hf_reserved,
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expert_field* ei_section_syntax_indicator, expert_field* ei_reserved,
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expert_field* ei_section_length, expert_field* ei_filter_info)
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{
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tvbuff_t *sub_tvb;
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guint offset = 0;
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proto_item *ti;
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proto_item *pi;
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proto_tree *etv_tree;
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proto_item *items[PACKET_MPEG_SECT_PI__SIZE];
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gboolean ssi;
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guint reserved;
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guint8 reserved2;
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guint16 filter_info;
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guint sect_len;
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ti = proto_tree_add_item(tree, proto, tvb, offset, -1, ENC_NA);
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etv_tree = proto_item_add_subtree(ti, ett_etv);
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offset += packet_mpeg_sect_header_extra(tvb, offset, etv_tree, §_len,
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&reserved, &ssi, items);
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if (FALSE != ssi) {
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proto_item *msg_error;
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msg_error = items[PACKET_MPEG_SECT_PI__SSI];
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PROTO_ITEM_SET_GENERATED(msg_error);
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expert_add_info(pinfo, msg_error, ei_section_syntax_indicator);
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}
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if (4 != reserved) {
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proto_item *msg_error;
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msg_error = items[PACKET_MPEG_SECT_PI__RESERVED];
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PROTO_ITEM_SET_GENERATED(msg_error);
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expert_add_info(pinfo, msg_error, ei_reserved);
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}
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col_append_fstr(pinfo->cinfo, COL_INFO, ", Length: %u", sect_len);
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proto_item_append_text(ti, " Length=%u", sect_len);
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if (1021 < sect_len) {
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proto_item *msg_error;
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msg_error = items[PACKET_MPEG_SECT_PI__LENGTH];
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PROTO_ITEM_SET_GENERATED(msg_error);
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expert_add_info(pinfo, msg_error, ei_section_length);
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}
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filter_info = tvb_get_ntohs(tvb, offset);
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col_append_fstr(pinfo->cinfo, COL_INFO, ", Filter: 0x%x", filter_info);
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proto_item_append_text(ti, " Filter=0x%x", filter_info);
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pi = proto_tree_add_item(etv_tree, hf_filter_info, tvb, offset, 2, ENC_BIG_ENDIAN);
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if ((proto_etv_dii == proto) && (0xFBFB != filter_info)) {
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expert_add_info_format(pinfo, pi, ei_filter_info,
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"Invalid filter_info value (must be 0xFBFB)");
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} else if ((proto_etv_ddb == proto) &&
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((filter_info < 1) || (0xfbef < filter_info)))
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{
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expert_add_info_format(pinfo, pi, ei_filter_info,
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"Invalid filter_info value (must be [0x0001-0xFBEF] inclusive)");
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}
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offset += 2;
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reserved2 = tvb_get_guint8(tvb, offset);
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pi = proto_tree_add_item(etv_tree, hf_reserved, tvb, offset, 1, ENC_BIG_ENDIAN);
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if (0 != reserved2) {
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expert_add_info_format(pinfo, pi, ei_reserved,
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"Invalid reserved2 bits (should all be 0)");
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}
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offset += 1;
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sub_tvb = tvb_new_subset_length(tvb, offset, sect_len-7);
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call_dissector(dsmcc_handle, sub_tvb, pinfo, tree);
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sect_len += 3 - 4; /* add header, remove crc */
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packet_mpeg_sect_crc(tvb, pinfo, etv_tree, 0, sect_len);
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}
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static int
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dissect_etv_ddb(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
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{
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "ETV-DDB");
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col_set_str(pinfo->cinfo, COL_INFO, "ETV DDB");
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dissect_etv_common(tvb, pinfo, tree, proto_etv_ddb, hf_etv_ddb_filter_info,
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hf_etv_ddb_reserved, &ei_etv_ddb_invalid_section_syntax_indicator,
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&ei_etv_ddb_invalid_reserved_bits, &ei_etv_ddb_invalid_section_length,
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&ei_etv_ddb_filter_info);
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return tvb_captured_length(tvb);
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}
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static int
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dissect_etv_dii(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
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{
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "ETV-DII");
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col_set_str(pinfo->cinfo, COL_INFO, "ETV DII");
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dissect_etv_common(tvb, pinfo, tree, proto_etv_dii, hf_etv_dii_filter_info,
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hf_etv_dii_reserved, &ei_etv_dii_invalid_section_syntax_indicator,
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&ei_etv_dii_invalid_reserved_bits, &ei_etv_dii_invalid_section_length,
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&ei_etv_dii_filter_info);
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return tvb_captured_length(tvb);
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}
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void
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proto_register_etv(void)
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{
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static hf_register_info hf_ddb[] = {
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{ &hf_etv_ddb_filter_info, {
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"Filter Info", "etv-ddb.filter_info",
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FT_UINT16, BASE_HEX, NULL, 0, NULL, HFILL
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} },
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{ &hf_etv_ddb_reserved, {
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"Reserved", "etv-ddb.reserved",
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FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL
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} }
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};
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static hf_register_info hf_dii[] = {
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{ &hf_etv_dii_filter_info, {
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"Filter Info", "etv-dii.filter_info",
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FT_UINT16, BASE_HEX, NULL, 0, NULL, HFILL
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} },
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{ &hf_etv_dii_reserved, {
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"Reserved", "etv-dii.reserved",
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FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL
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} }
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};
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static gint *ett[] = {
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&ett_etv,
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&ett_etv_payload
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};
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static ei_register_info ei_ddb[] = {
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{ &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 }},
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{ &ei_etv_ddb_invalid_reserved_bits, { "etv-ddb.invalid_reserved_bits", PI_MALFORMED, PI_ERROR, "Invalid reserved bits", EXPFILL }},
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{ &ei_etv_ddb_invalid_section_length, { "etv-ddb.invalid_section_length", PI_MALFORMED, PI_ERROR, "Invalid section_length (must not exceed 1021)", EXPFILL }},
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{ &ei_etv_ddb_filter_info, { "etv-ddb.filter_info.invalid", PI_MALFORMED, PI_ERROR, "Invalid filter info", EXPFILL }},
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};
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static ei_register_info ei_dii[] = {
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{ &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 }},
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{ &ei_etv_dii_invalid_reserved_bits, { "etv-dii.invalid_reserved_bits", PI_MALFORMED, PI_ERROR, "Invalid reserved bits", EXPFILL }},
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{ &ei_etv_dii_invalid_section_length, { "etv-dii.invalid_section_length", PI_MALFORMED, PI_ERROR, "Invalid section_length (must not exceed 1021)", EXPFILL }},
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{ &ei_etv_dii_filter_info, { "etv-dii.filter_info.invalid", PI_MALFORMED, PI_ERROR, "Invalid filter info", EXPFILL }},
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};
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expert_module_t* expert_etv_dii;
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expert_module_t* expert_etv_ddb;
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proto_etv_dii = proto_register_protocol("ETV-AM DII Section", "ETV-AM DII", "etv-dii");
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proto_etv_ddb = proto_register_protocol("ETV-AM DDB Section", "ETV-AM DDB", "etv-ddb");
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proto_register_field_array(proto_etv_dii, hf_dii, array_length(hf_dii));
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proto_register_field_array(proto_etv_ddb, hf_ddb, array_length(hf_ddb));
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proto_register_subtree_array(ett, array_length(ett));
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expert_etv_dii = expert_register_protocol(proto_etv_dii);
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expert_register_field_array(expert_etv_dii, ei_dii, array_length(ei_dii));
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expert_etv_ddb = expert_register_protocol(proto_etv_ddb);
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expert_register_field_array(expert_etv_ddb, ei_ddb, array_length(ei_ddb));
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}
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void
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proto_reg_handoff_etv(void)
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{
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dissector_handle_t etv_dii_handle;
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dissector_handle_t etv_ddb_handle;
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etv_dii_handle = create_dissector_handle(dissect_etv_dii, proto_etv_dii);
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etv_ddb_handle = create_dissector_handle(dissect_etv_ddb, proto_etv_ddb);
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dissector_add_uint("mpeg_sect.tid", ETV_TID_DII_SECTION, etv_dii_handle);
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dissector_add_uint("mpeg_sect.tid", ETV_TID_DDB_SECTION, etv_ddb_handle);
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dsmcc_handle = find_dissector_add_dependency("mp2t-dsmcc", proto_etv_dii);
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find_dissector_add_dependency("mp2t-dsmcc", proto_etv_ddb);
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}
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/*
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* Editor modelines - http://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 8
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* tab-width: 8
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* indent-tabs-mode: t
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* End:
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*
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* vi: set shiftwidth=8 tabstop=8 noexpandtab:
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* :indentSize=8:tabSize=8:noTabs=false:
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*/
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