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/******************************************************************************
** Copyright (C) 2006-2007 ascolab GmbH. All Rights Reserved.
** Web: http://www.ascolab.com
**
** 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 file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
** Project: OpcUa Wireshark Plugin
**
** Description: OpcUa Application Layer Decoder.
**
** Author: Gerhard Gappmeier <gerhard.gappmeier@ascolab.com>
******************************************************************************/
#include "config.h"
#include <epan/packet.h>
#include "opcua_application_layer.h"
/** NodeId encoding mask table */
static const value_string g_nodeidmasks[] = {
{ 0x00, "Two byte encoded Numeric" },
{ 0x01, "Four byte encoded Numeric" },
{ 0x02, "Numeric of arbitrary length" },
{ 0x03, "String" },
{ 0x04, "GUID" },
{ 0x05, "Opaque" },
{ 0, NULL }
};
/** Service type table */
extern const value_string g_requesttypes[];
static int hf_opcua_nodeid_encodingmask = -1;
static int hf_opcua_app_nsid = -1;
static int hf_opcua_app_numeric = -1;
/** Register application layer types. */
void registerApplicationLayerTypes(int proto)
{
/** header field definitions */
static hf_register_info hf[] =
{
/* id full name abbreviation type display strings bitmask blurb HFILL */
{&hf_opcua_nodeid_encodingmask, {"NodeId EncodingMask", "opcua.servicenodeid.encodingmask", FT_UINT8, BASE_HEX, VALS(g_nodeidmasks), 0x0, NULL, HFILL}},
{&hf_opcua_app_nsid, {"NodeId Namespace Index", "opcua.servicenodeid.nsid", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL}},
{&hf_opcua_app_numeric, {"NodeId Identifier Numeric", "opcua.servicenodeid.numeric", FT_UINT32, BASE_DEC, VALS(g_requesttypes), 0x0, NULL, HFILL}}
};
proto_register_field_array(proto, hf, array_length(hf));
}
/** Parses an OpcUa Service NodeId and returns the service type.
* In this cases the NodeId is always from type numeric and NSId = 0.
*/
int parseServiceNodeId(proto_tree *tree, tvbuff_t *tvb, gint *pOffset)
{
gint iOffset = *pOffset;
guint8 EncodingMask;
guint32 Numeric = 0;
EncodingMask = tvb_get_guint8(tvb, iOffset);
proto_tree_add_item(tree, hf_opcua_nodeid_encodingmask, tvb, iOffset, 1, ENC_LITTLE_ENDIAN);
iOffset++;
switch(EncodingMask)
{
case 0x00: /* two byte node id */
Numeric = tvb_get_guint8(tvb, iOffset);
proto_tree_add_item(tree, hf_opcua_app_numeric, tvb, iOffset, 1, ENC_LITTLE_ENDIAN);
iOffset+=1;
break;
case 0x01: /* four byte node id */
proto_tree_add_item(tree, hf_opcua_app_nsid, tvb, iOffset, 1, ENC_LITTLE_ENDIAN);
iOffset+=1;
Numeric = tvb_get_letohs(tvb, iOffset);
proto_tree_add_item(tree, hf_opcua_app_numeric, tvb, iOffset, 2, ENC_LITTLE_ENDIAN);
iOffset+=2;
break;
case 0x02: /* numeric, that does not fit into four bytes */
proto_tree_add_item(tree, hf_opcua_app_nsid, tvb, iOffset, 2, ENC_LITTLE_ENDIAN);
iOffset+=2;
Numeric = tvb_get_letohl(tvb, iOffset);
proto_tree_add_item(tree, hf_opcua_app_numeric, tvb, iOffset, 4, ENC_LITTLE_ENDIAN);
iOffset+=4;
break;
case 0x03: /* string */
case 0x04: /* guid */
case 0x05: /* opaque*/
/* NOT USED */
break;
};
*pOffset = iOffset;
return Numeric;
}
/*
* Editor modelines - http://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* vi: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/
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