diff options
author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-10 20:34:10 +0000 |
---|---|---|
committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-10 20:34:10 +0000 |
commit | e4ba6dbc3f1e76890b22773807ea37fe8fa2b1bc (patch) | |
tree | 68cb5ef9081156392f1dd62a00c6ccc1451b93df /epan/dissectors/packet-mpeg-sect.c | |
parent | Initial commit. (diff) | |
download | wireshark-e4ba6dbc3f1e76890b22773807ea37fe8fa2b1bc.tar.xz wireshark-e4ba6dbc3f1e76890b22773807ea37fe8fa2b1bc.zip |
Adding upstream version 4.2.2.upstream/4.2.2
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'epan/dissectors/packet-mpeg-sect.c')
-rw-r--r-- | epan/dissectors/packet-mpeg-sect.c | 461 |
1 files changed, 461 insertions, 0 deletions
diff --git a/epan/dissectors/packet-mpeg-sect.c b/epan/dissectors/packet-mpeg-sect.c new file mode 100644 index 0000000..bd2ad5d --- /dev/null +++ b/epan/dissectors/packet-mpeg-sect.c @@ -0,0 +1,461 @@ +/* packet-mpeg-sect.c + * Routines for MPEG2 (ISO/ISO 13818-1) Section 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 <epan/prefs.h> +#include <epan/crc32-tvb.h> +#include <epan/expert.h> +#include <epan/decode_as.h> +#include <epan/proto_data.h> +#include "packet-mpeg-sect.h" + +void proto_register_mpeg_sect(void); + +static int proto_mpeg_sect = -1; +static int hf_mpeg_sect_table_id = -1; +static int hf_mpeg_sect_syntax_indicator = -1; +static int hf_mpeg_sect_reserved = -1; +static int hf_mpeg_sect_length = -1; +static int hf_mpeg_sect_crc = -1; +static int hf_mpeg_sect_crc_status = -1; + +static gint ett_mpeg_sect = -1; + +static expert_field ei_mpeg_sect_crc = EI_INIT; + +static dissector_table_t mpeg_sect_tid_dissector_table; + +static gboolean mpeg_sect_check_crc = FALSE; + +/* minimum length of the entire section == + bytes from table_id to section_length == 3 bytes */ +#define MPEG_SECT_MIN_LEN 3 +/* the section_length field is 12 bits, it can add up to 4096 bytes + after the initial bytes */ +#define MPEG_SECT_MAX_LEN MPEG_SECT_MIN_LEN+4096 + + +#define MPEG_SECT_SYNTAX_INDICATOR_MASK 0x8000 +#define MPEG_SECT_RESERVED_MASK 0x7000 +#define MPEG_SECT_LENGTH_MASK 0x0FFF + +/* From ISO/IEC 13818-1 */ +enum { + TID_PAT, + TID_CA, + TID_PMT, + TID_TS_DESC, + TID_SCENE_DESC, + TID_OBJECT_DESC, + TID_FORBIDEN = 0xFF +}; + +/* From ETSI EN 300 468 */ +enum { + TID_NIT = 0x40, + TID_NIT_OTHER, + TID_SDT, + TID_SDT_OTHER = 0x46, + TID_BAT = 0x4A, + TID_EIT_PF = 0x4E, + TID_EIT_PF_OTHER, + TID_EIT_SC0 = 0x50, + TID_EIT_SC1, + TID_EIT_SC2, + TID_EIT_SC3, + TID_EIT_SC4, + TID_EIT_SC5, + TID_EIT_SC6, + TID_EIT_SC7, + TID_EIT_SC8, + TID_EIT_SC9, + TID_EIT_SCA, + TID_EIT_SCB, + TID_EIT_SCC, + TID_EIT_SCD, + TID_EIT_SCE, + TID_EIT_SCF, + TID_EIT_SC0_OTH = 0x60, + TID_EIT_SC1_OTH, + TID_EIT_SC2_OTH, + TID_EIT_SC3_OTH, + TID_EIT_SC4_OTH, + TID_EIT_SC5_OTH, + TID_EIT_SC6_OTH, + TID_EIT_SC7_OTH, + TID_EIT_SC8_OTH, + TID_EIT_SC9_OTH, + TID_EIT_SCA_OTH, + TID_EIT_SCB_OTH, + TID_EIT_SCC_OTH, + TID_EIT_SCD_OTH, + TID_EIT_SCE_OTH, + TID_EIT_SCF_OTH, + TID_TDT = 0x70, + TID_RST, + TID_ST, + TID_TOT, + TID_SIT = 0x7F +}; + +/* From ETSI EN 301 790 */ +enum { + TID_RMT = 0x41, /* Conflict with TID_NIT_OTHER */ + TID_SCT = 0xA0, + TID_FCT, + TID_TCT, + TID_SPT, + TID_CMT, + TID_TBTP, + TID_PCR, + TID_TIM = 0xB0 +}; + +/* From ETSI EN 301 192 */ +enum { + TID_DVB_MPE = 0x3E +}; + +/* From OC-SP-ETV-AM 1.0-IO5 */ +enum { + TID_ETV_EISS = 0xE0, + TID_ETV_DII = 0xE3, + TID_ETV_DDB = 0xE4 +}; + +/* From ETSI TS 102 899 */ +enum { + TID_AIT = 0x74 +}; + + +static const value_string mpeg_sect_table_id_vals[] = { + + { TID_PAT, "Program Association Table (PAT)" }, + { TID_CA, "Conditional Access (CA)" }, + { TID_PMT, "Program Map Table (PMT)" }, + { TID_TS_DESC, "Transport Stream Description" }, + { TID_SCENE_DESC, "ISO/IEC 14496 Scene Description" }, + { TID_OBJECT_DESC, "ISO/IEC 14496 Object Description" }, + { TID_NIT, "Network Information Table (NIT), current network" }, + { TID_NIT_OTHER, "Network Information Table (NIT), other network" }, + { TID_SDT, "Service Description Table (SDT), current network" }, + { TID_SDT_OTHER, "Service Description (SDT), other network" }, + { TID_BAT, "Bouquet Association Table (BAT)" }, + { TID_EIT_PF, "Event Information Table (EIT), present/following, actual TS" }, + { TID_EIT_PF_OTHER,"Event Information Table (EIT), present/following, other TS" }, + { TID_EIT_SC0, "Event Information Table (EIT), schedule 0, actual TS" }, + { TID_EIT_SC1, "Event Information Table (EIT), schedule 1, actual TS" }, + { TID_EIT_SC2, "Event Information Table (EIT), schedule 2, actual TS" }, + { TID_EIT_SC3, "Event Information Table (EIT), schedule 3, actual TS" }, + { TID_EIT_SC4, "Event Information Table (EIT), schedule 4, actual TS" }, + { TID_EIT_SC5, "Event Information Table (EIT), schedule 5, actual TS" }, + { TID_EIT_SC6, "Event Information Table (EIT), schedule 6, actual TS" }, + { TID_EIT_SC7, "Event Information Table (EIT), schedule 7, actual TS" }, + { TID_EIT_SC8, "Event Information Table (EIT), schedule 8, actual TS" }, + { TID_EIT_SC9, "Event Information Table (EIT), schedule 9, actual TS" }, + { TID_EIT_SCA, "Event Information Table (EIT), schedule A, actual TS" }, + { TID_EIT_SCB, "Event Information Table (EIT), schedule B, actual TS" }, + { TID_EIT_SCC, "Event Information Table (EIT), schedule C, actual TS" }, + { TID_EIT_SCD, "Event Information Table (EIT), schedule D, actual TS" }, + { TID_EIT_SCE, "Event Information Table (EIT), schedule E, actual TS" }, + { TID_EIT_SCF, "Event Information Table (EIT), schedule F, actual TS" }, + { TID_EIT_SC0_OTH, "Event Information Table (EIT), schedule 0, other TS" }, + { TID_EIT_SC1_OTH, "Event Information Table (EIT), schedule 1, other TS" }, + { TID_EIT_SC2_OTH, "Event Information Table (EIT), schedule 2, other TS" }, + { TID_EIT_SC3_OTH, "Event Information Table (EIT), schedule 3, other TS" }, + { TID_EIT_SC4_OTH, "Event Information Table (EIT), schedule 4, other TS" }, + { TID_EIT_SC5_OTH, "Event Information Table (EIT), schedule 5, other TS" }, + { TID_EIT_SC6_OTH, "Event Information Table (EIT), schedule 6, other TS" }, + { TID_EIT_SC7_OTH, "Event Information Table (EIT), schedule 7, other TS" }, + { TID_EIT_SC8_OTH, "Event Information Table (EIT), schedule 8, other TS" }, + { TID_EIT_SC9_OTH, "Event Information Table (EIT), schedule 9, other TS" }, + { TID_EIT_SCA_OTH, "Event Information Table (EIT), schedule A, other TS" }, + { TID_EIT_SCB_OTH, "Event Information Table (EIT), schedule B, other TS" }, + { TID_EIT_SCC_OTH, "Event Information Table (EIT), schedule C, other TS" }, + { TID_EIT_SCD_OTH, "Event Information Table (EIT), schedule D, other TS" }, + { TID_EIT_SCE_OTH, "Event Information Table (EIT), schedule E, other TS" }, + { TID_EIT_SCF_OTH, "Event Information Table (EIT), schedule F, other TS" }, + { TID_TDT, "Time and Date Table (TDT)" }, + { TID_RST, "Running Status Table (RST)" }, + { TID_ST, "Stuffing Table (ST)" }, + { TID_TOT, "Time Offset Table (TOT)" }, + { TID_AIT, "Application Information Table (AIT)" }, + { TID_SIT, "Selection Information Table (SIT)" }, + { TID_SCT, "Superframe Composition Table (SCT)" }, + { TID_FCT, "Frame Composition Table (FCT)" }, + { TID_TCT, "Time-Slot Composition Table (TCT)" }, + { TID_SPT, "Satellite Position Table (SPT)" }, + { TID_CMT, "Correction Message Table (CMT)" }, + { TID_TBTP, "Terminal Burst Time Plan (TBTP)" }, + { TID_TIM, "Terminal Information Message (TIM)" }, + { TID_DVB_MPE, "DVB MultiProtocol Encapsulation (MPE)" }, + { TID_ETV_EISS, "ETV Integrated Signaling Stream (EISS)" }, + { TID_ETV_DII, "ETV Download Info Indication" }, + { TID_ETV_DDB, "ETV Download Data Block" }, + { TID_FORBIDEN, "Forbidden" }, + { 0, NULL } +}; + +static void mpeg_sect_prompt(packet_info *pinfo, gchar* result) +{ + snprintf(result, MAX_DECODE_AS_PROMPT_LEN, "Table ID %u as", + GPOINTER_TO_UINT(p_get_proto_data(pinfo->pool, pinfo, proto_mpeg_sect, MPEG_SECT_TID_KEY))); +} + +static gpointer mpeg_sect_value(packet_info *pinfo) +{ + return p_get_proto_data(pinfo->pool, pinfo, proto_mpeg_sect, MPEG_SECT_TID_KEY); +} + +/* read a utc_time field in a tvb and write it to the utc_time struct + the encoding of the field is according to DVB-SI specification, section 5.2.5 + 16bit modified julian day (MJD), 24bit 6*4bit BCD digits hhmmss + return the length in bytes or -1 for error */ +gint +packet_mpeg_sect_mjd_to_utc_time(tvbuff_t *tvb, gint offset, nstime_t *utc_time) +{ + gint bcd_time_offset; /* start offset of the bcd time in the tvbuff */ + guint8 hour, min, sec; + + if (!utc_time) + return -1; + + nstime_set_zero(utc_time); + utc_time->secs = (tvb_get_ntohs(tvb, offset) - 40587) * 86400; + bcd_time_offset = offset+2; + hour = MPEG_SECT_BCD44_TO_DEC(tvb_get_guint8(tvb, bcd_time_offset)); + min = MPEG_SECT_BCD44_TO_DEC(tvb_get_guint8(tvb, bcd_time_offset+1)); + sec = MPEG_SECT_BCD44_TO_DEC(tvb_get_guint8(tvb, bcd_time_offset+2)); + if (hour>23 || min>59 || sec>59) + return -1; + + utc_time->secs += hour*3600 + min*60 + sec; + return 5; +} + +guint +packet_mpeg_sect_header(tvbuff_t *tvb, guint offset, + proto_tree *tree, guint *sect_len, gboolean *ssi) +{ + return packet_mpeg_sect_header_extra(tvb, offset, tree, sect_len, + NULL, ssi, NULL); +} + +guint +packet_mpeg_sect_header_extra(tvbuff_t *tvb, guint offset, proto_tree *tree, + guint *sect_len, guint *reserved, gboolean *ssi, + proto_item **items) +{ + guint tmp; + guint len = 0; + proto_item *pi[PACKET_MPEG_SECT_PI__SIZE]; + gint i; + + for (i = 0; i < PACKET_MPEG_SECT_PI__SIZE; i++) { + pi[i] = NULL; + } + + if (tree) { + pi[PACKET_MPEG_SECT_PI__TABLE_ID] = + proto_tree_add_item(tree, hf_mpeg_sect_table_id, + tvb, offset + len, 1, ENC_BIG_ENDIAN); + } + + len++; + + if (tree) { + pi[PACKET_MPEG_SECT_PI__SSI] = + proto_tree_add_item(tree, hf_mpeg_sect_syntax_indicator, + tvb, offset + len, 2, ENC_BIG_ENDIAN); + + pi[PACKET_MPEG_SECT_PI__RESERVED] = + proto_tree_add_item(tree, hf_mpeg_sect_reserved, tvb, + offset + len, 2, ENC_BIG_ENDIAN); + + pi[PACKET_MPEG_SECT_PI__LENGTH] = + proto_tree_add_item(tree, hf_mpeg_sect_length, tvb, + offset + len, 2, ENC_BIG_ENDIAN); + } + + tmp = tvb_get_ntohs(tvb, offset + len); + + if (sect_len) + *sect_len = MPEG_SECT_LENGTH_MASK & tmp; + + if (reserved) + *reserved = (MPEG_SECT_RESERVED_MASK & tmp) >> 12; + + if (ssi) + *ssi = (MPEG_SECT_SYNTAX_INDICATOR_MASK & tmp); + + if (items) { + for (i = 0; i < PACKET_MPEG_SECT_PI__SIZE; i++) { + items[i] = pi[i]; + } + } + + len += 2; + + return len; +} + + +guint +packet_mpeg_sect_crc(tvbuff_t *tvb, packet_info *pinfo, + proto_tree *tree, guint start, guint end) +{ + if (mpeg_sect_check_crc) { + proto_tree_add_checksum(tree, tvb, end, hf_mpeg_sect_crc, hf_mpeg_sect_crc_status, &ei_mpeg_sect_crc, pinfo, crc32_mpeg2_tvb_offset(tvb, start, end), + ENC_BIG_ENDIAN, PROTO_CHECKSUM_VERIFY); + } else { + proto_tree_add_checksum(tree, tvb, end, hf_mpeg_sect_crc, hf_mpeg_sect_crc_status, &ei_mpeg_sect_crc, pinfo, crc32_mpeg2_tvb_offset(tvb, start, end), + ENC_BIG_ENDIAN, PROTO_CHECKSUM_NO_FLAGS); + } + + return 4; +} + + +static int +dissect_mpeg_sect(tvbuff_t *tvb, packet_info *pinfo, + proto_tree *tree, void *data _U_) +{ + gint tvb_len; + gint offset = 0; + guint section_length = 0; + gboolean syntax_indicator = FALSE; + guint8 table_id; + + proto_item *ti; + proto_tree *mpeg_sect_tree; + + /* the incoming tvb contains only one section, no additional data */ + + tvb_len = (gint)tvb_reported_length(tvb); + if (tvb_len<MPEG_SECT_MIN_LEN || tvb_len>MPEG_SECT_MAX_LEN) + return 0; + + table_id = tvb_get_guint8(tvb, offset); + p_add_proto_data(pinfo->pool, pinfo, proto_mpeg_sect, MPEG_SECT_TID_KEY, GUINT_TO_POINTER(table_id)); + + /* Check if a dissector can parse the current table */ + if (dissector_try_uint(mpeg_sect_tid_dissector_table, table_id, tvb, pinfo, tree)) + return tvb_len; + + /* If no dissector is registered, use the common one */ + col_set_str(pinfo->cinfo, COL_PROTOCOL, "MPEG SECT"); + col_add_fstr(pinfo->cinfo, COL_INFO, "Table ID 0x%02x", table_id); + + ti = proto_tree_add_item(tree, proto_mpeg_sect, tvb, offset, -1, ENC_NA); + mpeg_sect_tree = proto_item_add_subtree(ti, ett_mpeg_sect); + + proto_item_append_text(ti, " Table_ID=0x%02x", table_id); + + packet_mpeg_sect_header(tvb, offset, mpeg_sect_tree, + §ion_length, &syntax_indicator); + + if (syntax_indicator) + packet_mpeg_sect_crc(tvb, pinfo, mpeg_sect_tree, 0, (section_length-1)); + + return tvb_len; +} + + +void +proto_register_mpeg_sect(void) +{ + static hf_register_info hf[] = { + { &hf_mpeg_sect_table_id, { + "Table ID", "mpeg_sect.tid", + FT_UINT8, BASE_HEX, VALS(mpeg_sect_table_id_vals), 0, NULL, HFILL + } }, + + { &hf_mpeg_sect_syntax_indicator, { + "Syntax indicator", "mpeg_sect.syntax_indicator", + FT_UINT16, BASE_DEC, NULL, MPEG_SECT_SYNTAX_INDICATOR_MASK, NULL, HFILL + } }, + + { &hf_mpeg_sect_reserved, { + "Reserved", "mpeg_sect.reserved", + FT_UINT16, BASE_HEX, NULL, MPEG_SECT_RESERVED_MASK, NULL, HFILL + } }, + + { &hf_mpeg_sect_length, { + "Length", "mpeg_sect.len", + FT_UINT16, BASE_DEC, NULL, MPEG_SECT_LENGTH_MASK, NULL, HFILL + } }, + + { &hf_mpeg_sect_crc, { + "CRC 32", "mpeg_sect.crc", + FT_UINT32, BASE_HEX, NULL, 0, NULL, HFILL + } }, + + { &hf_mpeg_sect_crc_status, { + "CRC 32 Status", "mpeg_sect.crc.status", + FT_UINT8, BASE_NONE, VALS(proto_checksum_vals), 0, NULL, HFILL + } }, + + }; + + static gint *ett[] = { + &ett_mpeg_sect + }; + + static ei_register_info ei[] = { + { &ei_mpeg_sect_crc, { "mpeg_sect.crc.invalid", PI_CHECKSUM, PI_WARN, "Invalid CRC", EXPFILL }}, + }; + + /* Decode As handling */ + static build_valid_func mpeg_sect_da_build_value[1] = {mpeg_sect_value}; + static decode_as_value_t mpeg_sect_da_values = {mpeg_sect_prompt, 1, mpeg_sect_da_build_value}; + static decode_as_t mpeg_sect_da = {"mpeg_sect", "mpeg_sect.tid", 1, 0, &mpeg_sect_da_values, NULL, NULL, decode_as_default_populate_list, decode_as_default_reset, decode_as_default_change, NULL}; + + module_t *mpeg_sect_module; + expert_module_t* expert_mpeg_sect; + + proto_mpeg_sect = proto_register_protocol("MPEG2 Section", "MPEG SECT", "mpeg_sect"); + register_dissector("mpeg_sect", dissect_mpeg_sect, proto_mpeg_sect); + + proto_register_field_array(proto_mpeg_sect, hf, array_length(hf)); + proto_register_subtree_array(ett, array_length(ett)); + expert_mpeg_sect = expert_register_protocol(proto_mpeg_sect); + expert_register_field_array(expert_mpeg_sect, ei, array_length(ei)); + + mpeg_sect_module = prefs_register_protocol(proto_mpeg_sect, NULL); + + prefs_register_bool_preference(mpeg_sect_module, + "verify_crc", + "Verify the section CRC", + "Whether the section dissector should verify the CRC", + &mpeg_sect_check_crc); + + mpeg_sect_tid_dissector_table = register_dissector_table("mpeg_sect.tid", + "MPEG SECT Table ID", + proto_mpeg_sect, FT_UINT8, BASE_HEX); + + register_decode_as(&mpeg_sect_da); +} + +/* + * 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: + */ |