/* packet-cosine.c
 * Routines for decoding CoSine IPNOS L2 debug output
 *
 * $Id: packet-cosine.c 13271 2005-02-03 23:24:08Z jmayer $
 *
 * Motonori Shindo <mshindo@mshindo.net>
 *
 * Ethereal - Network traffic analyzer
 * By Gerald Combs <gerald@ethereal.com>
 *
 * 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.
 */

/*
 * XXX TODO:
 *    o PPoATM and PPoFR encapsulation needs more test.
 *
 */

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

#include <glib.h>
#include <string.h>
#include <epan/packet.h>

static int proto_cosine = -1;
static int hf_pro = -1;
static int hf_off = -1;
static int hf_pri = -1;
static int hf_rm = -1;
static int hf_err = -1;

static gint ett_raw = -1;

static dissector_handle_t eth_withoutfcs_handle;
static dissector_handle_t ppp_hdlc_handle;
static dissector_handle_t llc_handle;
static dissector_handle_t chdlc_handle;
static dissector_handle_t fr_handle;
static dissector_handle_t data_handle;

static void
dissect_cosine(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
  proto_tree			*fh_tree;
  proto_item			*ti;
  union wtap_pseudo_header	*pseudo_header = pinfo->pseudo_header;

  /* load the top pane info. This should be overwritten by
     the next protocol in the stack */
  if(check_col(pinfo->cinfo, COL_RES_DL_SRC))
    col_set_str(pinfo->cinfo, COL_RES_DL_SRC, "N/A" );
  if(check_col(pinfo->cinfo, COL_RES_DL_DST))
    col_set_str(pinfo->cinfo, COL_RES_DL_DST, "N/A" );
  if(check_col(pinfo->cinfo, COL_PROTOCOL))
    col_set_str(pinfo->cinfo, COL_PROTOCOL, "N/A" );
  if(check_col(pinfo->cinfo, COL_INFO))
    col_set_str(pinfo->cinfo, COL_INFO, "CoSine IPNOS L2 debug output" );

  /* populate a tree in the second pane with the status of the link
     layer (ie none) */
  if(tree) {
    ti = proto_tree_add_protocol_format(tree, proto_cosine, tvb, 0, 0,
					"CoSine IPNOS L2 debug output (%s)",
					pseudo_header->cosine.if_name);
    fh_tree = proto_item_add_subtree(ti, ett_raw);
    proto_tree_add_uint(fh_tree, hf_pro, tvb, 0, 0, pseudo_header->cosine.pro);
    proto_tree_add_uint(fh_tree, hf_off, tvb, 0, 0, pseudo_header->cosine.off);
    proto_tree_add_uint(fh_tree, hf_pri, tvb, 0, 0, pseudo_header->cosine.pri);
    proto_tree_add_uint(fh_tree, hf_rm,  tvb, 0, 0, pseudo_header->cosine.rm);
    proto_tree_add_uint(fh_tree, hf_err, tvb, 0, 0, pseudo_header->cosine.err);

    switch (pseudo_header->cosine.encap) {
    case COSINE_ENCAP_ETH:
	    break;
    case COSINE_ENCAP_ATM:
    case COSINE_ENCAP_PPoATM:
	    proto_tree_add_text(fh_tree, tvb, 0, 16, "SAR header");
	    break;
    case COSINE_ENCAP_PPP:
    case COSINE_ENCAP_FR:
    case COSINE_ENCAP_PPoFR:
	    proto_tree_add_text(fh_tree, tvb, 0, 4, "Channel handle ID");
	    break;
    case COSINE_ENCAP_HDLC:
	    if (pseudo_header->cosine.direction == COSINE_DIR_TX) {
		    proto_tree_add_text(fh_tree, tvb, 0, 2,
					"Channel handle ID");
	    } else if (pseudo_header->cosine.direction == COSINE_DIR_RX) {
		    proto_tree_add_text(fh_tree, tvb, 0, 4,
					"Channel handle ID");
	    }
	    break;
    default:
	    break;
    }
  }

  switch (pseudo_header->cosine.encap) {
  case COSINE_ENCAP_ETH:
    	  call_dissector(eth_withoutfcs_handle, tvb_new_subset(tvb, 0, -1, -1),
			 pinfo, tree);
	  break;
  case COSINE_ENCAP_ATM:
  case COSINE_ENCAP_PPoATM:
    	  call_dissector(llc_handle, tvb_new_subset(tvb, 16, -1, -1),
			 pinfo, tree);
	  break;
  case COSINE_ENCAP_PPP:
	  call_dissector(ppp_hdlc_handle, tvb_new_subset(tvb, 4, -1, -1),
			 pinfo, tree);
	  break;
  case COSINE_ENCAP_HDLC:
	  if (pseudo_header->cosine.direction == COSINE_DIR_TX) {
		  call_dissector(chdlc_handle, tvb_new_subset(tvb, 2, -1, -1),
				 pinfo, tree);
	  } else if (pseudo_header->cosine.direction == COSINE_DIR_RX) {
		  call_dissector(chdlc_handle, tvb_new_subset(tvb, 4, -1, -1),
			 pinfo, tree);
	  }
	  break;
  case COSINE_ENCAP_FR:
  case COSINE_ENCAP_PPoFR:
	  call_dissector(fr_handle, tvb_new_subset(tvb, 4, -1, -1),
			 pinfo, tree);
	  break;
  case COSINE_ENCAP_TEST:
  case COSINE_ENCAP_UNKNOWN:
	  call_dissector(data_handle, tvb, pinfo, tree);
	  break;
  default:
	  break;
  }
}

void
proto_register_cosine(void)
{
  static hf_register_info hf[] = {
    { &hf_pro,
      { "Protocol", "cosine.pro", FT_UINT8, BASE_DEC, NULL, 0x0, "", HFILL}},
    { &hf_off,
      { "Offset", "cosine.off", FT_UINT8, BASE_DEC, NULL, 0x0, "", HFILL}},
    { &hf_pri,
      { "Priority", "cosine.pri", FT_UINT8, BASE_DEC, NULL, 0x0, "", HFILL}},
    { &hf_rm,
      { "Rate Marking",	"cosine.rm",  FT_UINT8, BASE_DEC, NULL, 0x0, "", HFILL}},
    { &hf_err,
      { "Error Code", "cosine.err", FT_UINT8, BASE_DEC, NULL, 0x0, "", HFILL}},
  };

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

  proto_cosine = proto_register_protocol("CoSine IPNOS L2 debug output",
					 "CoSine", "cosine");
  proto_register_field_array(proto_cosine, hf, array_length(hf));
  proto_register_subtree_array(ett, array_length(ett));
}

void
proto_reg_handoff_cosine(void)
{
  dissector_handle_t cosine_handle;

  /*
   * Get handles for dissectors.
   */
  eth_withoutfcs_handle = find_dissector("eth_withoutfcs");
  ppp_hdlc_handle = find_dissector("ppp_hdlc");
  llc_handle = find_dissector("llc");
  chdlc_handle = find_dissector("chdlc");
  fr_handle = find_dissector("fr");
  data_handle = find_dissector("data");

  cosine_handle = create_dissector_handle(dissect_cosine, proto_cosine);
  dissector_add("wtap_encap", WTAP_ENCAP_COSINE, cosine_handle);
}
