plugins/docsis/packet-bpkmrsp.c

   1 /* packet-bpkmrsp.c
   2  * Routines for Baseline Privacy Key Management Response dissection
   3  * Copyright 2002, Anand V. Narwani <anand[AT]narwani.org>
   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
  12  * modify it under the terms of the GNU General Public License
  13  * as published by the Free Software Foundation; either version 2
  14  * of the License, or (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
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  24  */
  25
  26 #include "config.h"
  27
  28 #include <epan/packet.h>
  29
  30 /* Initialize the protocol and registered fields */
  31 static int proto_docsis_bpkmrsp = -1;
  32 static int hf_docsis_bpkmrsp_code = -1;
  33 static int hf_docsis_bpkmrsp_length = -1;
  34 static int hf_docsis_bpkmrsp_ident = -1;
  35
  36 static const value_string code_field_vals[] = {
  37   {0, "Reserved"},
  38   {1, "Reserved"},
  39   {2, "Reserved"},
  40   {3, "Reserved"},
  41   {4, "Auth Response"},
  42   {5, "Auth Reply"},
  43   {6, "Auth Reject"},
  44   {7, "Key Response"},
  45   {8, "Key Reply"},
  46   {9, "Key Reject"},
  47   {10, "Auth Invalid"},
  48   {11, "TEK Invalid"},
  49   {12, "Authent Info"},
  50   {13, "Map Response"},
  51   {14, "Map Reply"},
  52   {15, "Map Reject"},
  53   {0, NULL},
  54 };
  55
  56
  57 /* Initialize the subtree pointers */
  58 static gint ett_docsis_bpkmrsp = -1;
  59
  60 static dissector_handle_t attrs_handle;
  61
  62 /* Code to actually dissect the packets */
  63 static void
  64 dissect_bpkmrsp (tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree)
  65 {
  66
  67   proto_item *it;
  68   proto_tree *bpkmrsp_tree;
  69   guint8 code;
  70   tvbuff_t *attrs_tvb;
  71
  72
  73   code = tvb_get_guint8 (tvb, 0);
  74
  75   col_add_fstr (pinfo->cinfo, COL_INFO, "BPKM Response (%s)",
  76             val_to_str (code, code_field_vals, "Unknown code %u"));
  77
  78   if (tree)
  79     {
  80       it =
  81         proto_tree_add_protocol_format (tree, proto_docsis_bpkmrsp, tvb, 0, -1,
  82                                         "BPKM Response Message");
  83       bpkmrsp_tree = proto_item_add_subtree (it, ett_docsis_bpkmrsp);
  84       proto_tree_add_item (bpkmrsp_tree, hf_docsis_bpkmrsp_code, tvb, 0, 1,
  85                            ENC_BIG_ENDIAN);
  86       proto_tree_add_item (bpkmrsp_tree, hf_docsis_bpkmrsp_ident, tvb, 1, 1,
  87                            ENC_BIG_ENDIAN);
  88       proto_tree_add_item (bpkmrsp_tree, hf_docsis_bpkmrsp_length, tvb, 2, 2,
  89                            ENC_BIG_ENDIAN);
  90     }
  91
  92   /* Code to Call subdissector */
  93   attrs_tvb = tvb_new_subset_remaining (tvb, 4);
  94   call_dissector (attrs_handle, attrs_tvb, pinfo, tree);
  95 }
  96
  97
  98
  99
 100 /* Register the protocol with Wireshark */
 101
 102 /* this format is require because a script is used to build the C function
 103    that calls all the protocol registration.
 104 */
 105
 106
 107 void
 108 proto_register_docsis_bpkmrsp (void)
 109 {
 110
 111 /* Setup list of header fields  See Section 1.6.1 for details*/
 112   static hf_register_info hf[] = {
 113     {&hf_docsis_bpkmrsp_code,
 114      {"BPKM Code", "docsis_bpkmrsp.code",
 115       FT_UINT8, BASE_DEC, VALS (code_field_vals), 0x0,
 116       "BPKM Response Message", HFILL}
 117      },
 118     {&hf_docsis_bpkmrsp_ident,
 119      {"BPKM Identifier", "docsis_bpkmrsp.ident",
 120       FT_UINT8, BASE_DEC, NULL, 0x0,
 121       NULL, HFILL}
 122      },
 123     {&hf_docsis_bpkmrsp_length,
 124      {"BPKM Length", "docsis_bpkmrsp.length",
 125       FT_UINT16, BASE_DEC, NULL, 0x0,
 126       NULL, HFILL}
 127      },
 128   };
 129
 130 /* Setup protocol subtree array */
 131   static gint *ett[] = {
 132     &ett_docsis_bpkmrsp,
 133   };
 134
 135 /* Register the protocol name and description */
 136   proto_docsis_bpkmrsp =
 137     proto_register_protocol
 138     ("DOCSIS Baseline Privacy Key Management Response", "DOCSIS BPKM-RSP",
 139      "docsis_bpkmrsp");
 140
 141 /* Required function calls to register the header fields and subtrees used */
 142   proto_register_field_array (proto_docsis_bpkmrsp, hf, array_length (hf));
 143   proto_register_subtree_array (ett, array_length (ett));
 144
 145   register_dissector ("docsis_bpkmrsp", dissect_bpkmrsp,
 146                       proto_docsis_bpkmrsp);
 147 }
 148
 149
 150 /* If this dissector uses sub-dissector registration add a registration routine.
 151    This format is required because a script is used to find these routines and
 152    create the code that calls these routines.
 153 */
 154 void
 155 proto_reg_handoff_docsis_bpkmrsp (void)
 156 {
 157   dissector_handle_t docsis_bpkmrsp_handle;
 158
 159   docsis_bpkmrsp_handle = find_dissector ("docsis_bpkmrsp");
 160   attrs_handle = find_dissector ("docsis_bpkmattr");
 161   dissector_add_uint ("docsis_mgmt", 0x0D, docsis_bpkmrsp_handle);
 162
 163 }