plugins/docsis/packet-bpkmreq.c

   1 /* packet-bpkmreq.c
   2  * Routines for Baseline Privacy Key Management Request 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_bpkmreq = -1;
  32 static int hf_docsis_bpkmreq_code = -1;
  33 static int hf_docsis_bpkmreq_length = -1;
  34 static int hf_docsis_bpkmreq_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 Request"},
  42   {5, "Auth Reply"},
  43   {6, "Auth Reject"},
  44   {7, "Key Request"},
  45   {8, "Key Reply"},
  46   {9, "Key Reject"},
  47   {10, "Auth Invalid"},
  48   {11, "TEK Invalid"},
  49   {12, "Authent Info"},
  50   {13, "Map Request"},
  51   {14, "Map Reply"},
  52   {15, "Map Reject"},
  53   {0, NULL},
  54 };
  55
  56
  57 /* Initialize the subtree pointers */
  58 static gint ett_docsis_bpkmreq = -1;
  59
  60 static dissector_handle_t attrs_handle;
  61
  62 /* Code to actually dissect the packets */
  63 static void
  64 dissect_bpkmreq (tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree)
  65 {
  66
  67   proto_item *it;
  68   proto_tree *bpkmreq_tree;
  69   guint8 code;
  70   tvbuff_t *attrs_tvb;
  71
  72   code = tvb_get_guint8 (tvb, 0);
  73
  74   col_add_fstr (pinfo->cinfo, COL_INFO, "BPKM Request (%s)",
  75             val_to_str (code, code_field_vals, "%d"));
  76
  77   if (tree)
  78     {
  79       it =
  80         proto_tree_add_protocol_format (tree, proto_docsis_bpkmreq, tvb, 0, -1,
  81                                         "BPKM Request Message");
  82       bpkmreq_tree = proto_item_add_subtree (it, ett_docsis_bpkmreq);
  83       proto_tree_add_item (bpkmreq_tree, hf_docsis_bpkmreq_code, tvb, 0, 1,
  84                            ENC_BIG_ENDIAN);
  85       proto_tree_add_item (bpkmreq_tree, hf_docsis_bpkmreq_ident, tvb, 1, 1,
  86                            ENC_BIG_ENDIAN);
  87       proto_tree_add_item (bpkmreq_tree, hf_docsis_bpkmreq_length, tvb, 2, 2,
  88                            ENC_BIG_ENDIAN);
  89     }
  90
  91   /* Code to Call subdissector */
  92   attrs_tvb = tvb_new_subset_remaining (tvb, 4);
  93   call_dissector (attrs_handle, attrs_tvb, pinfo, tree);
  94
  95
  96
  97 }
  98
  99
 100
 101
 102 /* Register the protocol with Wireshark */
 103
 104 /* this format is require because a script is used to build the C function
 105    that calls all the protocol registration.
 106 */
 107
 108
 109 void
 110 proto_register_docsis_bpkmreq (void)
 111 {
 112
 113 /* Setup list of header fields  See Section 1.6.1 for details*/
 114   static hf_register_info hf[] = {
 115     {&hf_docsis_bpkmreq_code,
 116      {"BPKM Code", "docsis_bpkmreq.code",
 117       FT_UINT8, BASE_DEC, VALS (code_field_vals), 0x0,
 118       "BPKM Request Message", HFILL}
 119      },
 120     {&hf_docsis_bpkmreq_ident,
 121      {"BPKM Identifier", "docsis_bpkmreq.ident",
 122       FT_UINT8, BASE_DEC, NULL, 0x0,
 123       NULL, HFILL}
 124      },
 125     {&hf_docsis_bpkmreq_length,
 126      {"BPKM Length", "docsis_bpkmreq.length",
 127       FT_UINT16, BASE_DEC, NULL, 0x0,
 128       NULL, HFILL}
 129      },
 130   };
 131
 132 /* Setup protocol subtree array */
 133   static gint *ett[] = {
 134     &ett_docsis_bpkmreq,
 135   };
 136
 137 /* Register the protocol name and description */
 138   proto_docsis_bpkmreq =
 139     proto_register_protocol ("DOCSIS Baseline Privacy Key Management Request",
 140                              "DOCSIS BPKM-REQ", "docsis_bpkmreq");
 141
 142 /* Required function calls to register the header fields and subtrees used */
 143   proto_register_field_array (proto_docsis_bpkmreq, hf, array_length (hf));
 144   proto_register_subtree_array (ett, array_length (ett));
 145
 146   register_dissector ("docsis_bpkmreq", dissect_bpkmreq,
 147                       proto_docsis_bpkmreq);
 148 }
 149
 150
 151 /* If this dissector uses sub-dissector registration add a registration routine.
 152    This format is required because a script is used to find these routines and
 153    create the code that calls these routines.
 154 */
 155 void
 156 proto_reg_handoff_docsis_bpkmreq (void)
 157 {
 158   dissector_handle_t docsis_bpkmreq_handle;
 159
 160   docsis_bpkmreq_handle = find_dissector ("docsis_bpkmreq");
 161   attrs_handle = find_dissector ("docsis_bpkmattr");
 162   dissector_add_uint ("docsis_mgmt", 0x0C, docsis_bpkmreq_handle);
 163
 164 }