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 1.6 2001/12/03 03:59:33 guy 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 #ifdef HAVE_SYS_TYPES_H
  37 # include <sys/types.h>
  38 #endif
  39
  40 #ifdef HAVE_NETINET_IN_H
  41 # include <netinet/in.h>
  42 #endif
  43
  44 #include <glib.h>
  45
  46 #ifdef NEED_SNPRINTF_H
  47 # include "snprintf.h"
  48 #endif
  49
  50 #include "packet.h"
  51
  52 static const char*
  53 bacapp_type_name (guint8 bacapp_type){
  54   static const char *type_names[] = {
  55         "Confirmed-Request-PDU",
  56         "Unconfirmed-Request-PDU",
  57         "SimpleACK-PDU",
  58         "ComplexACK-PDU",
  59         "SegmentACK-PDU",
  60         "Error-PDU",
  61         "Reject-PDU",
  62         "Abort-PDU"
  63         };
  64         return (bacapp_type > 7)? "unknown PDU" : type_names[bacapp_type];
  65 }
  66
  67 static int proto_bacapp = -1;
  68 static int hf_bacapp_type = -1;
  69
  70 static gint ett_bacapp = -1;
  71
  72 static dissector_handle_t data_handle;
  73
  74 static void
  75 dissect_bacapp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
  76 {
  77         proto_item *ti;
  78         proto_tree *bacapp_tree;
  79         guint8 offset;
  80         guint8 bacapp_type;
  81         tvbuff_t *next_tvb;
  82
  83         if (check_col(pinfo->fd, COL_PROTOCOL))
  84                 col_set_str(pinfo->fd, COL_PROTOCOL, "BACnet-APDU");
  85         if (check_col(pinfo->fd, COL_INFO))
  86                 col_add_str(pinfo->fd, COL_INFO, "BACnet APDU ");
  87
  88         offset  = 0;
  89         bacapp_type = (tvb_get_guint8(tvb, offset) >> 4) & 0x0f;
  90
  91         if (check_col(pinfo->fd, COL_INFO))
  92                 col_append_fstr(pinfo->fd, COL_INFO, "(%s)",
  93                 bacapp_type_name(bacapp_type));
  94         if (tree) {
  95                 ti = proto_tree_add_item(tree, proto_bacapp, tvb, offset, tvb_length(tvb), FALSE);
  96
  97                 bacapp_tree = proto_item_add_subtree(ti, ett_bacapp);
  98
  99                 proto_tree_add_uint_format(bacapp_tree, hf_bacapp_type, tvb,
 100                         offset, 1, bacapp_type, "APDU Type: %u (%s)", bacapp_type,
 101                                 bacapp_type_name(bacapp_type));
 102                 offset ++;
 103
 104         }
 105         next_tvb = tvb_new_subset(tvb,offset,-1,-1);
 106         call_dissector(data_handle,next_tvb, pinfo, tree);
 107 }
 108
 109
 110 void
 111 proto_register_bacapp(void)
 112 {
 113         static hf_register_info hf[] = {
 114                 { &hf_bacapp_type,
 115                         { "APDU Type",           "bacapp.bacapp_type",
 116                         FT_UINT8, BASE_DEC, NULL, 0xf0, "APDU Type", HFILL }
 117                 },
 118         };
 119         static gint *ett[] = {
 120                 &ett_bacapp,
 121         };
 122         proto_bacapp = proto_register_protocol("Building Automation and Control Network APDU",
 123             "BACapp", "bacapp");
 124         proto_register_field_array(proto_bacapp, hf, array_length(hf));
 125         proto_register_subtree_array(ett, array_length(ett));
 126 }
 127 void
 128 proto_reg_handoff_bacapp(void)
 129 {
 130         dissector_handle_t bacapp_handle;
 131
 132         bacapp_handle = create_dissector_handle(dissect_bacapp, proto_bacapp);
 133         dissector_add("bacnet_control_net", 0, bacapp_handle);
 134         data_handle = find_dissector("data");
 135 }