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/* packet-dccack.c
 * Routines for DCC Acknowledge Message  dissection
 * Copyright 2004, Darryl Hymel <darryl.hymel[AT]arrisi.com>
 *
 * 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>
#include <epan/exceptions.h>

void proto_register_docsis_dccack(void);
void proto_reg_handoff_docsis_dccack(void);

#define DCCACK_KEY_SEQ_NUM 31
#define DCCACK_HMAC_DIGEST 27

/* Initialize the protocol and registered fields */
static int proto_docsis_dccack = -1;

static int hf_docsis_dccack_tran_id = -1;
static int hf_docsis_dccack_key_seq_num = -1;
static int hf_docsis_dccack_hmac_digest = -1;

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

/* Dissection */
static int
dissect_dccack (tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree, void* data _U_)
{
  guint16 pos;
  guint8 type, length;
  proto_tree *dcc_tree;
  proto_item *dcc_item;
  guint16 len;

  len = tvb_reported_length(tvb);

  col_set_str(pinfo->cinfo, COL_INFO, "DCC-ACK Message: ");

  if (tree)
    {
      dcc_item =
        proto_tree_add_protocol_format (tree, proto_docsis_dccack, tvb, 0,
                                        -1, "DCC-ACK Message");
      dcc_tree = proto_item_add_subtree (dcc_item, ett_docsis_dccack);
      proto_tree_add_item (dcc_tree, hf_docsis_dccack_tran_id, tvb, 0, 2, ENC_BIG_ENDIAN);

      pos = 2;
      while (pos < len)
        {
          type = tvb_get_guint8 (tvb, pos++);
          length = tvb_get_guint8 (tvb, pos++);
          switch (type)
            {
            case DCCACK_KEY_SEQ_NUM:
              if (length == 1)
                {
                  proto_tree_add_item (dcc_tree, hf_docsis_dccack_key_seq_num, tvb,
                                       pos, length, ENC_BIG_ENDIAN);
                }
              else
                {
                  THROW (ReportedBoundsError);
                }
              break;
            case DCCACK_HMAC_DIGEST:
              if (length == 20)
                {
                  proto_tree_add_item (dcc_tree, hf_docsis_dccack_hmac_digest, tvb,
                                       pos, length, ENC_NA);
                }
              else
                {
                  THROW (ReportedBoundsError);
                }
              break;
            }                   /* switch(type) */
          pos = pos + length;
        }                       /* while (pos < len) */
    }                           /* if (tree) */
    return tvb_captured_length(tvb);
}

/* Register the protocol with Wireshark */
void
proto_register_docsis_dccack (void)
{
  static hf_register_info hf[] = {
    {&hf_docsis_dccack_tran_id ,
     {
       "Transaction ID",
       "docsis_dccack.tran_id",
       FT_UINT16, BASE_DEC, NULL, 0x0,
       NULL,
       HFILL
     }
    },
    {&hf_docsis_dccack_key_seq_num ,
     {
       "Auth Key Sequence Number",
       "docsis_dccack.key_seq_num",
       FT_UINT8, BASE_DEC, NULL, 0x0,
       NULL,
       HFILL
     }
    },
    {&hf_docsis_dccack_hmac_digest ,
     {
       "HMAC-DigestNumber",
       "docsis_dccack.hmac_digest",
       FT_BYTES, BASE_NONE, NULL, 0x0,
       NULL,
       HFILL
     }
    },

  };

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

  proto_docsis_dccack =
    proto_register_protocol ("DOCSIS Downstream Channel Change Acknowledge",
                             "DOCSIS DCC-ACK", "docsis_dccack");

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

  register_dissector ("docsis_dccack", dissect_dccack, proto_docsis_dccack);
}

void
proto_reg_handoff_docsis_dccack (void)
{
  dissector_handle_t docsis_dccack_handle;

  docsis_dccack_handle = find_dissector ("docsis_dccack");
  dissector_add_uint ("docsis_mgmt", 0x19, docsis_dccack_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:
 */