Adding upstream version 4.2.2.upstream/4.2.2

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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,
+                &section_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:
+ */