wireshark/plugins/docsis/packet-bpkmreq.c

/* packet-bpkmreq.c
 * Routines for Baseline Privacy Key Management Request dissection
 * Copyright 2002, Anand V. Narwani <anand[AT]narwani.org>
 *
 * Wireshark - Network traffic analyzer
 * By Gerald Combs <gerald@wireshark.org>
 * Copyright 1998 Gerald Combs
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include "config.h"

#include <epan/packet.h>

void proto_register_docsis_bpkmreq(void);
void proto_reg_handoff_docsis_bpkmreq(void);

/* Initialize the protocol and registered fields */
static int proto_docsis_bpkmreq = -1;
static int hf_docsis_bpkmreq_code = -1;
static int hf_docsis_bpkmreq_length = -1;
static int hf_docsis_bpkmreq_ident = -1;

static const value_string code_field_vals[] = {
  { 0, "Reserved"},
  { 1, "Reserved"},
  { 2, "Reserved"},
  { 3, "Reserved"},
  { 4, "Auth Request"},
  { 5, "Auth Reply"},
  { 6, "Auth Reject"},
  { 7, "Key Request"},
  { 8, "Key Reply"},
  { 9, "Key Reject"},
  {10, "Auth Invalid"},
  {11, "TEK Invalid"},
  {12, "Authent Info"},
  {13, "Map Request"},
  {14, "Map Reply"},
  {15, "Map Reject"},
  {0, NULL},
};

/* Initialize the subtree pointers */
static gint ett_docsis_bpkmreq = -1;

static dissector_handle_t attrs_handle;
static dissector_handle_t docsis_bpkmreq_handle;

/* Dissection */
static int
dissect_bpkmreq (tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree, void* data _U_)
{
  proto_item *it;
  proto_tree *bpkmreq_tree;
  guint8 code;
  tvbuff_t *attrs_tvb;

  code = tvb_get_guint8 (tvb, 0);

  col_add_fstr (pinfo->cinfo, COL_INFO, "BPKM Request (%s)",
                val_to_str (code, code_field_vals, "%d"));

  if (tree)
    {
      it =
        proto_tree_add_protocol_format (tree, proto_docsis_bpkmreq, tvb, 0, -1,
                                        "BPKM Request Message");
      bpkmreq_tree = proto_item_add_subtree (it, ett_docsis_bpkmreq);
      proto_tree_add_item (bpkmreq_tree, hf_docsis_bpkmreq_code, tvb, 0, 1,
                           ENC_BIG_ENDIAN);
      proto_tree_add_item (bpkmreq_tree, hf_docsis_bpkmreq_ident, tvb, 1, 1,
                           ENC_BIG_ENDIAN);
      proto_tree_add_item (bpkmreq_tree, hf_docsis_bpkmreq_length, tvb, 2, 2,
                           ENC_BIG_ENDIAN);
    }

  attrs_tvb = tvb_new_subset_remaining (tvb, 4);
  call_dissector (attrs_handle, attrs_tvb, pinfo, tree);
  return tvb_captured_length(tvb);
}

/* Register the protocol with Wireshark */
void
proto_register_docsis_bpkmreq (void)
{
  static hf_register_info hf[] = {
    {&hf_docsis_bpkmreq_code,
     {"BPKM Code", "docsis_bpkmreq.code",
      FT_UINT8, BASE_DEC, VALS (code_field_vals), 0x0,
      "BPKM Request Message", HFILL}
    },
    {&hf_docsis_bpkmreq_ident,
     {"BPKM Identifier", "docsis_bpkmreq.ident",
      FT_UINT8, BASE_DEC, NULL, 0x0,
      NULL, HFILL}
    },
    {&hf_docsis_bpkmreq_length,
     {"BPKM Length", "docsis_bpkmreq.length",
      FT_UINT16, BASE_DEC, NULL, 0x0,
      NULL, HFILL}
    },
  };

  static gint *ett[] = {
    &ett_docsis_bpkmreq,
  };

  proto_docsis_bpkmreq =
    proto_register_protocol ("DOCSIS Baseline Privacy Key Management Request",
                             "DOCSIS BPKM-REQ", "docsis_bpkmreq");

  proto_register_field_array (proto_docsis_bpkmreq, hf, array_length (hf));
  proto_register_subtree_array (ett, array_length (ett));

  docsis_bpkmreq_handle = register_dissector ("docsis_bpkmreq", dissect_bpkmreq,
                      proto_docsis_bpkmreq);
}


void
proto_reg_handoff_docsis_bpkmreq (void)
{
  attrs_handle = find_dissector ("docsis_bpkmattr");
  dissector_add_uint ("docsis_mgmt", 0x0C, docsis_bpkmreq_handle);
}

/*
 * Editor modelines  -  http://www.wireshark.org/tools/modelines.html
 *
 * Local Variables:
 * c-basic-offset: 2
 * tab-width: 8
 * indent-tabs-mode: nil
 * End:
 *
 * ex: set shiftwidth=2 tabstop=8 expandtab:
 * :indentSize=2:tabSize=8:noTabs=true:
 */