epan/dissectors/packet-mpeg-pat.c

   1 /* packet-mpeg-pat.c
   2  * Routines for MPEG2 (ISO/ISO 13818-1) Program Associate Table (PAT) dissection
   3  * Copyright 2012, Guy Martin <gmsoft@tuxicoman.be>
   4  *
   5  * Wireshark - Network traffic analyzer
   6  * By Gerald Combs <gerald@wireshark.org>
   7  * Copyright 1998 Gerald Combs
   8  *
   9  * SPDX-License-Identifier: GPL-2.0-or-later
  10  */
  11
  12 #include "config.h"
  13
  14 #include <epan/packet.h>
  15 #include <epan/tfs.h>
  16 #include <wsutil/array.h>
  17 #include "packet-mpeg-sect.h"
  18
  19 void proto_register_mpeg_pat(void);
  20 void proto_reg_handoff_mpeg_pat(void);
  21
  22 static dissector_handle_t mpeg_pat_handle;
  23
  24 static int proto_mpeg_pat;
  25 static int hf_mpeg_pat_transport_stream_id;
  26 static int hf_mpeg_pat_reserved;
  27 static int hf_mpeg_pat_version_number;
  28 static int hf_mpeg_pat_current_next_indicator;
  29 static int hf_mpeg_pat_section_number;
  30 static int hf_mpeg_pat_last_section_number;
  31
  32 static int hf_mpeg_pat_program_number;
  33 static int hf_mpeg_pat_program_reserved;
  34 static int hf_mpeg_pat_program_map_pid;
  35
  36
  37 static int ett_mpeg_pat;
  38 static int ett_mpeg_pat_prog;
  39
  40 #define MPEG_PAT_RESERVED_MASK                    0xC0
  41 #define MPEG_PAT_VERSION_NUMBER_MASK              0x3E
  42 #define MPEG_PAT_CURRENT_NEXT_INDICATOR_MASK      0x01
  43
  44 #define MPEG_PAT_PROGRAM_RESERVED_MASK          0xE000
  45 #define MPEG_PAT_PROGRAM_MAP_PID_MASK           0x1FFF
  46
  47 static int
  48 dissect_mpeg_pat(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
  49 {
  50     unsigned offset = 0, length = 0;
  51     uint16_t prog_num, prog_pid;
  52
  53     proto_item *ti;
  54     proto_tree *mpeg_pat_tree;
  55     proto_tree *mpeg_pat_prog_tree;
  56
  57     /* The TVB should start right after the section_length in the Section packet */
  58
  59     col_set_str(pinfo->cinfo, COL_INFO, "Program Association Table (PAT)");
  60
  61     ti = proto_tree_add_item(tree, proto_mpeg_pat, tvb, offset, -1, ENC_NA);
  62     mpeg_pat_tree = proto_item_add_subtree(ti, ett_mpeg_pat);
  63
  64     offset += packet_mpeg_sect_header(tvb, offset, mpeg_pat_tree, &length, NULL);
  65     length -= 4;
  66
  67     proto_tree_add_item(mpeg_pat_tree, hf_mpeg_pat_transport_stream_id, tvb, offset, 2, ENC_BIG_ENDIAN);
  68     offset += 2;
  69
  70     proto_tree_add_item(mpeg_pat_tree, hf_mpeg_pat_reserved, tvb, offset, 1, ENC_BIG_ENDIAN);
  71     proto_tree_add_item(mpeg_pat_tree, hf_mpeg_pat_version_number, tvb, offset, 1, ENC_BIG_ENDIAN);
  72     proto_tree_add_item(mpeg_pat_tree, hf_mpeg_pat_current_next_indicator, tvb, offset, 1, ENC_BIG_ENDIAN);
  73     offset += 1;
  74
  75     proto_tree_add_item(mpeg_pat_tree, hf_mpeg_pat_section_number, tvb, offset, 1, ENC_BIG_ENDIAN);
  76     offset += 1;
  77
  78     proto_tree_add_item(mpeg_pat_tree, hf_mpeg_pat_last_section_number, tvb, offset, 1, ENC_BIG_ENDIAN);
  79     offset += 1;
  80
  81     /* Parse all the programs */
  82     while (offset < length) {
  83
  84         prog_num = tvb_get_ntohs(tvb, offset);
  85         prog_pid = tvb_get_ntohs(tvb, offset + 2) & MPEG_PAT_PROGRAM_MAP_PID_MASK;
  86
  87         mpeg_pat_prog_tree = proto_tree_add_subtree_format(mpeg_pat_tree, tvb, offset, 4,
  88                         ett_mpeg_pat_prog, NULL, "Program 0x%04hx -> PID 0x%04hx", prog_num, prog_pid);
  89
  90         proto_tree_add_item(mpeg_pat_prog_tree, hf_mpeg_pat_program_number, tvb, offset, 2, ENC_BIG_ENDIAN);
  91         offset += 2;
  92
  93         proto_tree_add_item(mpeg_pat_prog_tree, hf_mpeg_pat_program_reserved, tvb, offset, 2, ENC_BIG_ENDIAN);
  94         proto_tree_add_item(mpeg_pat_prog_tree, hf_mpeg_pat_program_map_pid, tvb, offset, 2, ENC_BIG_ENDIAN);
  95         offset += 2;
  96
  97     }
  98
  99     offset += packet_mpeg_sect_crc(tvb, pinfo, mpeg_pat_tree, 0, offset);
 100     proto_item_set_len(ti, offset);
 101     return tvb_captured_length(tvb);
 102 }
 103
 104
 105 void
 106 proto_register_mpeg_pat(void)
 107 {
 108
 109     static hf_register_info hf[] = {
 110
 111         { &hf_mpeg_pat_transport_stream_id, {
 112             "Transport Stream ID", "mpeg_pat.tsid",
 113             FT_UINT16, BASE_HEX, NULL, 0, NULL, HFILL
 114         } },
 115
 116         { &hf_mpeg_pat_reserved, {
 117             "Reserved", "mpeg_pat.reserved",
 118             FT_UINT8, BASE_HEX, NULL, MPEG_PAT_RESERVED_MASK, NULL, HFILL
 119         } },
 120
 121         { &hf_mpeg_pat_version_number, {
 122             "Version Number", "mpeg_pat.version",
 123             FT_UINT8, BASE_HEX, NULL, MPEG_PAT_VERSION_NUMBER_MASK, NULL, HFILL
 124         } },
 125
 126         { &hf_mpeg_pat_current_next_indicator, {
 127             "Current/Next Indicator", "mpeg_pat.cur_next_ind",
 128             FT_BOOLEAN, 8, TFS(&tfs_current_not_yet), MPEG_PAT_CURRENT_NEXT_INDICATOR_MASK, NULL, HFILL
 129         } },
 130
 131         { &hf_mpeg_pat_section_number, {
 132             "Section Number", "mpeg_pat.sect_num",
 133             FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL
 134         } },
 135
 136         { &hf_mpeg_pat_last_section_number, {
 137             "Last Section Number", "mpeg_pat.last_sect_num",
 138             FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL
 139         } },
 140
 141         { &hf_mpeg_pat_program_number, {
 142             "Program Number", "mpeg_pat.prog_num",
 143             FT_UINT16, BASE_HEX, NULL, 0, NULL, HFILL
 144         } },
 145
 146         { &hf_mpeg_pat_program_reserved, {
 147             "Reserved", "mpeg_pat.prog_reserved",
 148             FT_UINT16, BASE_HEX, NULL, MPEG_PAT_PROGRAM_RESERVED_MASK, NULL, HFILL
 149         } },
 150
 151         { &hf_mpeg_pat_program_map_pid, {
 152             "Program Map PID", "mpeg_pat.prog_map_pid",
 153             FT_UINT16, BASE_HEX, NULL, MPEG_PAT_PROGRAM_MAP_PID_MASK, NULL, HFILL
 154         } },
 155
 156     };
 157
 158     static int *ett[] = {
 159         &ett_mpeg_pat,
 160         &ett_mpeg_pat_prog
 161     };
 162
 163     proto_mpeg_pat = proto_register_protocol("MPEG2 Program Association Table", "MPEG PAT", "mpeg_pat");
 164
 165     proto_register_field_array(proto_mpeg_pat, hf, array_length(hf));
 166     proto_register_subtree_array(ett, array_length(ett));
 167
 168     mpeg_pat_handle = register_dissector("mpeg_pat", dissect_mpeg_pat, proto_mpeg_pat);
 169 }
 170
 171
 172 void proto_reg_handoff_mpeg_pat(void)
 173 {
 174     dissector_add_uint("mpeg_sect.tid", MPEG_PAT_TID, mpeg_pat_handle);
 175 }
 176
 177 /*
 178  * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
 179  *
 180  * Local variables:
 181  * c-basic-offset: 4
 182  * tab-width: 8
 183  * indent-tabs-mode: nil
 184  * End:
 185  *
 186  * vi: set shiftwidth=4 tabstop=8 expandtab:
 187  * :indentSize=4:tabSize=8:noTabs=true:
 188  */