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packet-bctp.c

/*
 *  packet-bctp.c
 *  Q.1990 BICC bearer control tunnelling protocol
 *
 *  (c) 2007, Luis E. Garcia Ontanon <luis@ontanon.org>
 *
 * $Id: packet-bctp.c 27050 2008-12-18 19:08:49Z wmeier $
 *
 * 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * Ref ITU-T Rec. Q.1990 (07/2001)
 */
 
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

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

#define PNAME  "BCTP Q.1990"
#define PSNAME "BCTP"
#define PFNAME "bctp"

static int proto_bctp = -1;
static int hf_bctp_bvei = -1;
static int hf_bctp_bvi = -1;
static int hf_bctp_tpei = -1;
static int hf_bctp_tpi = -1;

static gint ett_bctp = -1;
static dissector_table_t bctp_dissector_table;
static dissector_handle_t data_handle;
static dissector_handle_t text_handle;

/*
static const range_string tpi_vals[] = {
      {0x00,0x17,"spare (binary encoded protocols)"},
      {0x18,0x1f,"reserved for national use (binary encoded protocols)"},
      {0x20,0x20,"IPBCP (text encoded)"},
      {0x21,0x21,"spare (text encoded protocol)"},
      {0x22,0x22,"not used"},
      {0x23,0x37,"spare (text encoded protocols)"},
      {0x38,0x3f,"reserved for national use (text encoded protocols)"},
      {0,0,NULL}
};
*/

static const value_string bvei_vals[] = {
      {0,"No indication"},
      {0,"Version Error Indication, BCTP version not supported"},
      {0,NULL}
};


static void dissect_bctp(tvbuff_t* tvb, packet_info* pinfo, proto_tree* tree) {
      proto_item* pi = proto_tree_add_item(tree, proto_bctp, tvb,0,2, FALSE);
      proto_tree* pt = proto_item_add_subtree(pi,ett_bctp);
      tvbuff_t* sub_tvb = tvb_new_subset(tvb, 2, -1, -1);
      guint8 tpi = tvb_get_guint8(tvb,1) & 0x3f;
      
      proto_tree_add_item(pt, hf_bctp_bvei, tvb,0,2, FALSE);
      proto_tree_add_item(pt, hf_bctp_bvi, tvb,0,2, FALSE);
      proto_tree_add_item(pt, hf_bctp_tpei, tvb,0,2, FALSE);
      proto_tree_add_item(pt, hf_bctp_tpi, tvb,0,2, FALSE);
      
      if ( dissector_try_port(bctp_dissector_table, tpi, sub_tvb, pinfo, tree) ) {
            return;
      } else if (tpi <= 0x22) {
            call_dissector(data_handle,sub_tvb, pinfo, tree);
      } else {
            /* tpi > 0x22 */
            call_dissector(text_handle,sub_tvb, pinfo, tree);
      }
}

void
proto_register_bctp (void)
{
      static hf_register_info hf[] = {
            {&hf_bctp_bvei, {"BVEI", "bctp.bvei", FT_UINT16, BASE_HEX, VALS(bvei_vals), 0x4000, "BCTP Version Error Indicator", HFILL }},
            {&hf_bctp_bvi, {"BVI", "bctp.bvi", FT_UINT16, BASE_HEX, NULL, 0x1F00, "BCTP Version Indicator", HFILL }},
            {&hf_bctp_tpei, {"TPEI", "bctp.tpei", FT_UINT16, BASE_HEX, NULL, 0x0040, "Tunneled Protocol Error Indicator", HFILL }},
            {&hf_bctp_tpi, {"TPI", "bctp.tpi", FT_UINT16, BASE_HEX, NULL, 0x003F, "Tunneled Protocol Indicator", HFILL }},
      };
      static gint *ett[] = {
            &ett_bctp
      };

      proto_bctp = proto_register_protocol(PNAME, PSNAME, PFNAME);
      proto_register_field_array(proto_bctp, hf, array_length(hf));
      proto_register_subtree_array(ett, array_length(ett));

      register_dissector("bctp", dissect_bctp, proto_bctp);

      bctp_dissector_table = register_dissector_table("bctp.tpi", "BCTP Tunneled Protocol Indicator", FT_UINT32, BASE_DEC);
}

void
proto_reg_handoff_bctp(void)
{
      data_handle = find_dissector("data");
      text_handle = find_dissector("data-text-lines");
}


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