epan/dissectors/packet-mpeg-ca.c

   1 /* packet-mpeg-ca.c
   2  * Routines for MPEG2 (ISO/ISO 13818-1) Conditional Access Table (CA) dissection
   3  * Copyright 2012, Guy Martin <gmsoft@tuxicoman.be>
   4  *
   5  * $Id$
   6  *
   7  * Wireshark - Network traffic analyzer
   8  * By Gerald Combs <gerald@wireshark.org>
   9  * Copyright 1998 Gerald Combs
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License along
  22  * with this program; if not, write to the Free Software Foundation, Inc.,
  23  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  24  */
  25
  26 #include "config.h"
  27
  28 #include <glib.h>
  29
  30 #include <epan/packet.h>
  31 #include <epan/dissectors/packet-mpeg-sect.h>
  32
  33 #include "packet-mpeg-descriptor.h"
  34
  35 static int proto_mpeg_ca = -1;
  36 static int hf_mpeg_ca_reserved = -1;
  37 static int hf_mpeg_ca_version_number = -1;
  38 static int hf_mpeg_ca_current_next_indicator = -1;
  39 static int hf_mpeg_ca_section_number = -1;
  40 static int hf_mpeg_ca_last_section_number = -1;
  41
  42 static gint ett_mpeg_ca = -1;
  43
  44 #define MPEG_CA_TID                                 0x01
  45
  46 #define MPEG_CA_RESERVED_MASK                   0xFFFFC0
  47 #define MPEG_CA_VERSION_NUMBER_MASK             0x00003E
  48 #define MPEG_CA_CURRENT_NEXT_INDICATOR_MASK     0x000001
  49
  50 static const value_string mpeg_ca_cur_next_vals[] = {
  51
  52     { 0x0, "Not yet applicable" },
  53     { 0x1, "Currently applicable" },
  54     { 0x0, NULL }
  55
  56 };
  57
  58 static void
  59 dissect_mpeg_ca(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
  60 {
  61
  62     guint offset = 0, length = 0;
  63
  64     proto_item *ti;
  65     proto_tree *mpeg_ca_tree;
  66
  67     /* The TVB should start right after the section_length in the Section packet */
  68
  69     col_set_str(pinfo->cinfo, COL_INFO, "Conditional Access Table (CA)");
  70
  71     ti = proto_tree_add_item(tree, proto_mpeg_ca, tvb, offset, -1, ENC_NA);
  72     mpeg_ca_tree = proto_item_add_subtree(ti, ett_mpeg_ca);
  73
  74     offset += packet_mpeg_sect_header(tvb, offset, mpeg_ca_tree, &length, NULL);
  75     length -= 4;
  76
  77     proto_tree_add_item(mpeg_ca_tree, hf_mpeg_ca_reserved, tvb, offset, 3, ENC_BIG_ENDIAN);
  78     proto_tree_add_item(mpeg_ca_tree, hf_mpeg_ca_version_number, tvb, offset, 3, ENC_BIG_ENDIAN);
  79     proto_tree_add_item(mpeg_ca_tree, hf_mpeg_ca_current_next_indicator, tvb, offset, 3, ENC_BIG_ENDIAN);
  80     offset += 3;
  81
  82     proto_tree_add_item(mpeg_ca_tree, hf_mpeg_ca_section_number, tvb, offset, 1, ENC_BIG_ENDIAN);
  83     offset += 1;
  84
  85     proto_tree_add_item(mpeg_ca_tree, hf_mpeg_ca_last_section_number, tvb, offset, 1, ENC_BIG_ENDIAN);
  86     offset += 1;
  87
  88     /* Parse all the programs */
  89     while (offset < length)
  90         offset += proto_mpeg_descriptor_dissect(tvb, offset, mpeg_ca_tree);
  91
  92     offset += packet_mpeg_sect_crc(tvb, pinfo, mpeg_ca_tree, 0, offset);
  93
  94     proto_item_set_len(ti, offset);
  95 }
  96
  97
  98 void
  99 proto_register_mpeg_ca(void)
 100 {
 101
 102     static hf_register_info hf[] = {
 103
 104         { &hf_mpeg_ca_reserved, {
 105             "Reserved", "mpeg_ca.reserved",
 106             FT_UINT24, BASE_HEX, NULL, MPEG_CA_RESERVED_MASK,
 107                         NULL, HFILL
 108         } },
 109
 110         { &hf_mpeg_ca_version_number, {
 111             "Version Number", "mpeg_ca.version",
 112             FT_UINT24, BASE_HEX, NULL, MPEG_CA_VERSION_NUMBER_MASK,
 113                         NULL, HFILL
 114         } },
 115
 116         { &hf_mpeg_ca_current_next_indicator, {
 117             "Current/Next Indicator", "mpeg_ca.cur_next_ind",
 118             FT_UINT24, BASE_HEX, VALS(mpeg_ca_cur_next_vals), MPEG_CA_CURRENT_NEXT_INDICATOR_MASK,
 119                         NULL, HFILL
 120         } },
 121
 122         { &hf_mpeg_ca_section_number, {
 123             "Section Number", "mpeg_ca.sect_num",
 124             FT_UINT8, BASE_DEC, NULL, 0,
 125                         NULL, HFILL
 126         } },
 127
 128         { &hf_mpeg_ca_last_section_number, {
 129             "Last Section Number", "mpeg_ca.last_sect_num",
 130             FT_UINT8, BASE_DEC, NULL, 0,
 131                         NULL, HFILL
 132         } },
 133
 134     };
 135
 136     static gint *ett[] = {
 137         &ett_mpeg_ca,
 138     };
 139
 140     proto_mpeg_ca = proto_register_protocol("MPEG2 Conditional Access Table", "MPEG CA", "mpeg_ca");
 141
 142     proto_register_field_array(proto_mpeg_ca, hf, array_length(hf));
 143     proto_register_subtree_array(ett, array_length(ett));
 144
 145 }
 146
 147
 148 void proto_reg_handoff_mpeg_ca(void)
 149 {
 150     dissector_handle_t mpeg_ca_handle;
 151
 152     mpeg_ca_handle = create_dissector_handle(dissect_mpeg_ca, proto_mpeg_ca);
 153     dissector_add_uint("mpeg_sect.tid", MPEG_CA_TID, mpeg_ca_handle);
 154 }
 155
 156 /*
 157  * Editor modelines  -  http://www.wireshark.org/tools/modelines.html
 158  *
 159  * Local variables:
 160  * c-basic-offset: 4
 161  * tab-width: 8
 162  * indent-tabs-mode: nil
 163  * End:
 164  *
 165  * vi: set shiftwidth=4 tabstop=8 expandtab:
 166  * :indentSize=4:tabSize=8:noTabs=true:
 167  */