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packet-cimetrics.c

/* packet-cimetrics.c
 * Routines for Cimetrics LLC OUI dissection
 * Copyright 2008 Steve Karg <skarg@users.sourceforge.net> Alabama
 *
 * $Id: packet-cimetrics.c 25323 2008-05-20 06:52:22Z jake $
 *
 * 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.
 */

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

#include <epan/packet.h>
#include "packet-llc.h"
#include <epan/oui.h>
#include "packet-mstp.h"

/* Probably should be a preference, but here for now */
#define BACNET_MSTP_SUMMARY_IN_TREE

/* the U+4 device does MS/TP, uLAN, Modbus */
static const value_string cimetrics_pid_vals[] = {
      { 0x0001,   "U+4 MS/TP" },
      { 0,        NULL }
};

static dissector_handle_t bacnet_handle;
static dissector_handle_t data_handle;

static int proto_cimetrics_mstp = -1;
static int hf_llc_cimetrics_pid = -1;
static gint ett_cimetrics_mstp = -1;

static int hf_cimetrics_mstp_timer = -1;
static int hf_cimetrics_mstp_value = -1;


static void
dissect_cimetrics_mstp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
      proto_item *ti;
      proto_tree *subtree;
      gint offset = 0;
#ifdef BACNET_MSTP_SUMMARY_IN_TREE
      guint8 mstp_frame_type = 0;
      guint8 mstp_frame_source = 0;
      guint8 mstp_frame_destination = 0;
#endif

#ifdef BACNET_MSTP_SUMMARY_IN_TREE
      mstp_frame_type = tvb_get_guint8(tvb, offset+3);
      mstp_frame_destination = tvb_get_guint8(tvb, offset+4);
      mstp_frame_source = tvb_get_guint8(tvb, offset+5);
      ti = proto_tree_add_protocol_format(tree,
            proto_cimetrics_mstp, tvb, offset, 9,
            "BACnet MS/TP, Src (%u), Dst (%u), %s",
            mstp_frame_source, mstp_frame_destination,
            mstp_frame_type_text(mstp_frame_type));
#else
      ti = proto_tree_add_item(tree, proto_cimetrics_mstp, tvb, offset, 9, FALSE);
#endif
      subtree = proto_item_add_subtree(ti, ett_cimetrics_mstp);
      proto_tree_add_item(subtree, hf_cimetrics_mstp_timer, tvb,
                  offset++, 2, TRUE);
      offset++;
      proto_tree_add_item(subtree, hf_cimetrics_mstp_value, tvb,
                  offset++, 1, TRUE);
      dissect_mstp(tvb, pinfo, tree, subtree, offset);
}

void
proto_register_cimetrics(void)
{
      static hf_register_info hf[] = {
            { &hf_cimetrics_mstp_timer,
                  { "Delta Time", "cimetrics_mstp.timer",
                  FT_UINT16, BASE_DEC, NULL, 0,
                  "Milliseconds", HFILL }
            },
            { &hf_cimetrics_mstp_value,
                  { "8-bit value", "cimetrics_mstp.value",
                  FT_UINT8, BASE_DEC, NULL, 0,
                  "value", HFILL }
            }
      };
      static hf_register_info hf2 = {
            &hf_llc_cimetrics_pid,
                  { "PID", "llc.cimetrics_pid",
                  FT_UINT16, BASE_HEX, VALS(cimetrics_pid_vals), 0,
                  NULL, HFILL }
      };
      static gint *ett[] = {
            &ett_cimetrics_mstp
      };

      proto_cimetrics_mstp = proto_register_protocol("Cimetrics MS/TP",
          "Cimetrics MS/TP", "cimetrics");

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

      register_dissector("cimetrics", dissect_cimetrics_mstp,
            proto_cimetrics_mstp);
      
      llc_add_oui(OUI_CIMETRICS, "llc.cimetrics_pid",
            "Cimetrics OUI PID", &hf2);
}

void
proto_reg_handoff_cimetrics(void)
{
      dissector_handle_t mstp_handle;

      mstp_handle = find_dissector("cimetrics");
      dissector_add("llc.cimetrics_pid", 1, mstp_handle);
      bacnet_handle = find_dissector("bacnet");
      data_handle = find_dissector("data");
}

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