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/* packet-dis.c
* Routines for Distributed Interactive Simulation packet
* disassembly (IEEE-1278).
* Copyright 2005, Scientific Research Corporation
* Initial implementation by Jeremy Ouellette <jouellet@scires.com>
*
* $Id$
*
* 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.
*/
/* TODO / NOTES:
* Field handling isn't ideal; this dissector should probably register
* each individual field via the proto_register_field_array mechanism.
* This would lead to better PDML output (instead of requiring the end user
* to manually parse out the key/value pairs) and better searchability in
* interactive mode.
*
* Lots more PDUs to implement. Only the basic engagement events are currently
* handled (Fire, Detonation, Entity State). Most of the basic field types are
* complete, however, so declaring new PDUs should be fairly simple.
*
* Lots more enumerations to implement.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdio.h>
#include <epan/packet.h>
#include <epan/value_string.h>
#include <epan/prefs.h>
#include "packet-dis-enums.h"
#include "packet-dis-pdus.h"
#include "packet-dis-fields.h"
#define DEFAULT_DIS_UDP_PORT 3000
static gint proto_dis = -1;
static gint ett_dis = -1;
static gint ett_dis_header = -1;
static gint ett_dis_payload = -1;
static dissector_handle_t dis_dissector_handle;
static guint dis_udp_port = DEFAULT_DIS_UDP_PORT;
static const char* dis_proto_name = "Distributed Interactive Simulation";
static const char* dis_proto_name_short = "DIS";
/* Main dissector routine to be invoked for a DIS PDU.
*/
static gint dissect_dis(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
proto_item *dis_tree = 0;
proto_item *dis_node = 0;
proto_item *dis_header_tree = 0;
proto_item *dis_header_node = 0;
proto_item *dis_payload_tree = 0;
proto_item *dis_payload_node = 0;
gint offset = 0;
const gchar *pduString = 0;
DIS_ParserNode *pduParser = 0;
/* DIS packets must be at least 12 bytes long. DIS uses port 3000, by
* default, but the Cisco Redundant Link Management protocol can also use
* that port; RLM packets are 8 bytes long, so we use this to distinguish
* between them.
*/
if (tvb_reported_length(tvb) < 12)
{
return 0;
}
/* Reset the global PDU type variable -- this will be parsed as part of
* the DIS header.
*/
pduType = DIS_PDUTYPE_OTHER;
numArticulations = 0;
if (check_col(pinfo->cinfo, COL_PROTOCOL))
{
col_set_str(pinfo->cinfo, COL_PROTOCOL, dis_proto_name_short);
}
/* Add the top-level DIS node under which the rest of the fields will be
* displayed.
*/
dis_node = proto_tree_add_protocol_format(tree, proto_dis, tvb, offset,
-1, "Distributed Interactive Simulation");
dis_tree = proto_item_add_subtree(dis_node, ett_dis);
/* Add a node to contain the DIS header fields.
*/
dis_header_node = proto_tree_add_text(dis_tree, tvb, offset, -1, "Header");
dis_header_tree = proto_item_add_subtree(dis_header_node, ett_dis_header);
offset = parseFields(tvb, dis_header_tree, offset, DIS_FIELDS_PDU_HEADER);
proto_item_set_end(dis_header_node, tvb, offset);
/* Locate the appropriate PDU parser, if type is known.
*/
switch (pduType)
{
case DIS_PDUTYPE_ENTITY_STATE:
pduParser = DIS_PARSER_ENTITY_STATE_PDU;
break;
case DIS_PDUTYPE_FIRE:
pduParser = DIS_PARSER_FIRE_PDU;
break;
case DIS_PDUTYPE_DETONATION:
pduParser = DIS_PARSER_DETONATION_PDU;
break;
default:
pduParser = 0;
break;
}
/* Locate the string name for the PDU type enumeration, or default to
* "Unknown".
*/
pduString = val_to_str(pduType, DIS_PDU_Type_Strings, "Unknown");
/* Add a node to contain the DIS PDU fields.
*/
dis_payload_node = proto_tree_add_text(dis_tree, tvb, offset, -1,
"%s PDU", pduString);
/* If a parser was located, invoke it on the data packet.
*/
if (pduParser != 0)
{
dis_payload_tree = proto_item_add_subtree(dis_payload_node,
ett_dis_payload);
offset = parseFields(tvb, dis_payload_tree, offset, pduParser);
proto_item_set_end(dis_payload_node, tvb, offset);
}
return tvb_length(tvb);
}
/* Register handoff routine for DIS dissector. This will be invoked initially
* and when the preferences are changed, to handle changing the UDP port for
* which this dissector is registered.
*/
void proto_reg_handoff_dis(void)
{
static gboolean dis_prefs_initialized = FALSE;
if (!dis_prefs_initialized)
{
dis_dissector_handle = new_create_dissector_handle(dissect_dis, proto_dis);
}
else
{
dissector_delete("udp.port", dis_udp_port, dis_dissector_handle);
}
dissector_add("udp.port", dis_udp_port, dis_dissector_handle);
}
/* Registration routine for the DIS protocol.
*/
void proto_register_dis(void)
{
/* Only these 3 ett variables will be present for every DIS PDU --
* the rest are dynamic based on PDU type.
*/
static gint *ett[] =
{
&ett_dis,
&ett_dis_header,
&ett_dis_payload
};
module_t *dis_module;
proto_dis = proto_register_protocol(dis_proto_name, dis_proto_name_short,
"dis");
proto_register_subtree_array(ett, array_length(ett));
dis_module = prefs_register_protocol(proto_dis, proto_reg_handoff_dis);
/* Create an unsigned integer preference to allow the user to specify the
* UDP port on which to capture DIS packets.
*/
prefs_register_uint_preference(dis_module, "udp.port",
"DIS UDP Port",
"Set the UDP port for DIS messages",
10, &dis_udp_port);
/* Perform the one-time initialization of the DIS parsers.
*/
initializeParsers();
}
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