/* packet-retix-bpdu.c
 * Routines for BPDU (Retix Spanning Tree Protocol) disassembly
 *
 * $Id: packet-retix-bpdu.c 14884 2005-07-09 00:53:17Z guy $
 *
 * Copyright 2005 Giles Scott (gscott <AT> arubanetworks dot com> 
 *
 * Ethereal - Network traffic analyzer
 * By Gerald Combs <gerald@ethereal.com>
 * 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#if 0
#include <stdio.h>
#include <string.h>
#endif
#include <glib.h>
#include <epan/packet.h>
#if 0
#include "llcsaps.h"
#include "ppptypes.h"
#include "chdlctypes.h"
#endif
#include <epan/addr_resolv.h>

static gint ett_retix_bpdu = -1;
static int proto_retix_bpdu = -1;

static int hf_retix_bpdu_root_mac = -1;
static int hf_retix_bpdu_bridge_mac = -1;
static int hf_retix_bpdu_max_age = -1;
static int hf_retix_bpdu_hello_time = -1;
static int hf_retix_bpdu_forward_delay = -1;

/* I don't have the spec's for this protcol so its been reverse engineered
 * It seems quite like 802.1D
 * It looks like the protocol version is specified in the ethernet trailer
 * In the single packet I have the trailer is
 * "RevC CBPDU"
 * There are several fields I've not dissected as I'm not exactly sure what they are
 * What ever happened to Retix anyway?
*/
static void
dissect_retix_bpdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
  proto_tree *retix_bpdu_tree;
  proto_tree *ti;
  const guint8 *bridge_mac_str;

  if (check_col(pinfo->cinfo, COL_PROTOCOL)) {
    col_set_str(pinfo->cinfo, COL_PROTOCOL, "R-STP");
  }
  if (check_col(pinfo->cinfo, COL_INFO)) {
    col_clear(pinfo->cinfo, COL_INFO);
  }
  bridge_mac_str = tvb_get_ptr(tvb, 10, 6);
  if (check_col(pinfo->cinfo, COL_INFO)){
    col_add_fstr(pinfo->cinfo, COL_INFO, "Bridge MAC %s", ether_to_str(bridge_mac_str)); 
  }

  
  retix_bpdu_tree = NULL;

  if (tree) {
    ti = proto_tree_add_item(tree, proto_retix_bpdu, tvb, 0, -1, FALSE);
    retix_bpdu_tree = proto_item_add_subtree(ti, ett_retix_bpdu);
  }

  proto_tree_add_item(retix_bpdu_tree, hf_retix_bpdu_root_mac, tvb, 0, 6, FALSE);

  proto_tree_add_item(retix_bpdu_tree, hf_retix_bpdu_bridge_mac, tvb, 10, 6, FALSE);

  proto_tree_add_item(retix_bpdu_tree, hf_retix_bpdu_max_age, tvb, 20, 2, FALSE);
  proto_tree_add_item(retix_bpdu_tree, hf_retix_bpdu_hello_time, tvb, 22, 2, FALSE);
  proto_tree_add_item(retix_bpdu_tree, hf_retix_bpdu_forward_delay, tvb, 24, 2, FALSE);

}


void
proto_register_retix_bpdu(void)
{
  static hf_register_info hf[] = {
    { &hf_retix_bpdu_root_mac,
    { "Root MAC",  "rstp.root.hw", FT_ETHER, BASE_NONE, NULL, 0x0,
    "", HFILL}},

    { &hf_retix_bpdu_bridge_mac,
    { "Bridge MAC", "rstp.bridge.hw", FT_ETHER, BASE_NONE, NULL, 0x0,
    "", HFILL}},

    { &hf_retix_bpdu_max_age,
    { "Max Age", "rstp.maxage", FT_UINT16, BASE_DEC, NULL, 0x0,
    "", HFILL}},

    { &hf_retix_bpdu_hello_time,
    { "Hello Time", "rstp.hello", FT_UINT16, BASE_DEC, NULL, 0x0,
    "", HFILL}},

    { &hf_retix_bpdu_forward_delay,
    { "Forward Delay", "rstp.forward", FT_UINT16, BASE_DEC, NULL, 0x0,
    "", HFILL}},
  };

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

  proto_retix_bpdu = proto_register_protocol("Retix Spanning Tree Protocol", "R-STP", "r-stp");
  proto_register_field_array(proto_retix_bpdu, hf, array_length(hf)); 
  proto_register_subtree_array(ett, array_length(ett));
  register_dissector("rbpdu", dissect_retix_bpdu, proto_retix_bpdu);
}

void
proto_reg_handoff_retix_bpdu(void)
{
}
