packet-bacapp.c

   1 /* packet-bacapp.c
   2  * Routines for BACnet (APDU) dissection
   3  * Copyright 2001, Hartmut Mueller <hartmut@abmlinux.org>, FH Dortmund
   4  *
   5  * $Id: packet-bacapp.c,v 1.13 2002/08/28 21:00:07 jmayer Exp $
   6  *
   7  * Ethereal - Network traffic analyzer
   8  * By Gerald Combs <gerald@ethereal.com>
   9  * Copyright 1998 Gerald Combs
  10  *
  11  * Copied from README.developer,v 1.23
  12  *
  13  * This program is free software; you can redistribute it and/or
  14  * modify it under the terms of the GNU General Public License
  15  * as published by the Free Software Foundation; either version 2
  16  * of the License, or (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, write to the Free Software
  25  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  26  */
  27
  28 #ifdef HAVE_CONFIG_H
  29 # include "config.h"
  30 #endif
  31
  32 #include <stdio.h>
  33 #include <stdlib.h>
  34 #include <string.h>
  35
  36 #include <glib.h>
  37
  38 #include <epan/packet.h>
  39
  40 static const char*
  41 bacapp_type_name (guint8 bacapp_type){
  42   static const char *type_names[] = {
  43         "Confirmed-Request-PDU",
  44         "Unconfirmed-Request-PDU",
  45         "SimpleACK-PDU",
  46         "ComplexACK-PDU",
  47         "SegmentACK-PDU",
  48         "Error-PDU",
  49         "Reject-PDU",
  50         "Abort-PDU"
  51         };
  52         return (bacapp_type > 7)? "unknown PDU" : type_names[bacapp_type];
  53 }
  54
  55 static int proto_bacapp = -1;
  56 static int hf_bacapp_type = -1;
  57
  58 static gint ett_bacapp = -1;
  59
  60 static dissector_handle_t data_handle;
  61
  62 static void
  63 dissect_bacapp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
  64 {
  65         proto_item *ti;
  66         proto_tree *bacapp_tree;
  67         guint8 offset;
  68         guint8 bacapp_type;
  69         tvbuff_t *next_tvb;
  70
  71         if (check_col(pinfo->cinfo, COL_PROTOCOL))
  72                 col_set_str(pinfo->cinfo, COL_PROTOCOL, "BACnet-APDU");
  73         if (check_col(pinfo->cinfo, COL_INFO))
  74                 col_add_str(pinfo->cinfo, COL_INFO, "BACnet APDU ");
  75
  76         offset  = 0;
  77         bacapp_type = (tvb_get_guint8(tvb, offset) >> 4) & 0x0f;
  78
  79         if (check_col(pinfo->cinfo, COL_INFO))
  80                 col_append_fstr(pinfo->cinfo, COL_INFO, "(%s)",
  81                 bacapp_type_name(bacapp_type));
  82         if (tree) {
  83                 ti = proto_tree_add_item(tree, proto_bacapp, tvb, offset, -1, FALSE);
  84
  85                 bacapp_tree = proto_item_add_subtree(ti, ett_bacapp);
  86
  87                 proto_tree_add_uint_format(bacapp_tree, hf_bacapp_type, tvb,
  88                         offset, 1, bacapp_type, "APDU Type: %u (%s)", bacapp_type,
  89                                 bacapp_type_name(bacapp_type));
  90                 offset ++;
  91
  92         }
  93         next_tvb = tvb_new_subset(tvb,offset,-1,-1);
  94         call_dissector(data_handle,next_tvb, pinfo, tree);
  95 }
  96
  97
  98 void
  99 proto_register_bacapp(void)
 100 {
 101         static hf_register_info hf[] = {
 102                 { &hf_bacapp_type,
 103                         { "APDU Type",           "bacapp.bacapp_type",
 104                         FT_UINT8, BASE_DEC, NULL, 0xf0, "APDU Type", HFILL }
 105                 },
 106         };
 107         static gint *ett[] = {
 108                 &ett_bacapp,
 109         };
 110         proto_bacapp = proto_register_protocol("Building Automation and Control Network APDU",
 111             "BACapp", "bacapp");
 112         proto_register_field_array(proto_bacapp, hf, array_length(hf));
 113         proto_register_subtree_array(ett, array_length(ett));
 114         register_dissector("bacapp", dissect_bacapp, proto_bacapp);
 115 }
 116
 117 void
 118 proto_reg_handoff_bacapp(void)
 119 {
 120         data_handle = find_dissector("data");
 121 }
 122