forked from osmocom/wireshark
![Jaap Keuter](/assets/img/avatar_default.png)
Add support for the DIS protocol dissector to more fully interpret the PDU types "Data Query", "Data", and "Set Data". It should interpret the originating and receiving entity IDs, request ID, number of fixed and variable datum fields, and the ID and values of each datum field in the PDU. svn path=/trunk/; revision=28583
222 lines
6.8 KiB
C
222 lines
6.8 KiB
C
/* 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/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 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;
|
|
case DIS_PDUTYPE_DATA_QUERY:
|
|
pduParser = DIS_PARSER_DATA_QUERY_PDU;
|
|
break;
|
|
case DIS_PDUTYPE_SET_DATA:
|
|
case DIS_PDUTYPE_DATA:
|
|
pduParser = DIS_PARSER_DATA_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);
|
|
}
|
|
|
|
/* Registration routine for the DIS protocol.
|
|
*/
|
|
void proto_reg_handoff_dis(void);
|
|
|
|
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();
|
|
}
|
|
|
|
/* 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;
|
|
static dissector_handle_t dis_dissector_handle;
|
|
static guint saved_dis_udp_port;
|
|
|
|
if (!dis_prefs_initialized)
|
|
{
|
|
dis_dissector_handle = new_create_dissector_handle(dissect_dis, proto_dis);
|
|
dis_prefs_initialized = TRUE;
|
|
}
|
|
else
|
|
{
|
|
dissector_delete("udp.port", saved_dis_udp_port, dis_dissector_handle);
|
|
}
|
|
|
|
dissector_add("udp.port", dis_udp_port, dis_dissector_handle);
|
|
saved_dis_udp_port = dis_udp_port;
|
|
}
|
|
|