123 lines
4.0 KiB
C
123 lines
4.0 KiB
C
/******************************************************************************
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** $Id: ua_application_layer.c,v 1.3 2007/02/08 11:31:56 gergap Exp $
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**
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** Copyright (C) 2006-2007 ascolab GmbH. All Rights Reserved.
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** Web: http://www.ascolab.com
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**
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** This program is free software; you can redistribute it and/or
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** modify it under the terms of the GNU General Public License
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** as published by the Free Software Foundation; either version 2
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** of the License, or (at your option) any later version.
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**
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** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
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** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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**
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** Project: OpcUa Wireshark Plugin
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**
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** Description: OpcUa Application Layer Decoder.
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**
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** Author: Gerhard Gappmeier <gerhard.gappmeier@ascolab.com>
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** Last change by: $Author: gergap $
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**
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******************************************************************************/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <gmodule.h>
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#include <epan/packet.h>
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#include "opcua_simpletypes.h"
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/** NodeId encoding mask table */
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static const value_string g_nodeidmasks[] = {
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{ 0, "Two byte encoded Numeric" },
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{ 1, "Four byte encoded Numeric" },
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{ 2, "Numeric of arbitrary length" },
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{ 3, "String" },
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{ 4, "URI" },
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{ 5, "GUID" },
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{ 6, "ByteString" },
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{ 0x80, "UriMask" },
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{ 0, NULL }
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};
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/** Service type table */
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extern const value_string g_requesttypes[];
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static int hf_opcua_nodeid_encodingmask = -1;
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static int hf_opcua_app_nsid = -1;
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static int hf_opcua_app_numeric = -1;
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/** header field definitions */
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static hf_register_info hf[] =
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{
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{ &hf_opcua_nodeid_encodingmask,
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{ "NodeId EncodingMask", "application.nodeid.encodingmask", FT_UINT8, BASE_HEX, VALS(g_nodeidmasks), 0x0, "", HFILL }
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},
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{ &hf_opcua_app_nsid,
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{ "NodeId EncodingMask", "application.nodeid.nsid", FT_UINT8, BASE_DEC, NULL, 0x0, "", HFILL }
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},
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{ &hf_opcua_app_numeric,
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{ "NodeId Identifier Numeric", "application.nodeid.numeric", FT_UINT32, BASE_DEC, VALS(g_requesttypes), 0x0, "", HFILL }
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}
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};
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/** Register application layer types. */
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void registerApplicationLayerTypes(int proto)
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{
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proto_register_field_array(proto, hf, array_length(hf));
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}
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/** Parses an OpcUa Service NodeId and returns the service type.
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* In this cases the NodeId is always from type numeric and NSId = 0.
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*/
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int parseServiceNodeId(proto_tree *tree, tvbuff_t *tvb, gint *pOffset, char *szFieldName)
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{
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gint iOffset = *pOffset;
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guint8 EncodingMask, NSId = 0;
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guint32 Numeric = 0;
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szFieldName = 0; /* avoid warning */
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EncodingMask = tvb_get_guint8(tvb, iOffset);
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proto_tree_add_item(tree, hf_opcua_nodeid_encodingmask, tvb, iOffset, 1, TRUE);
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iOffset++;
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switch(EncodingMask)
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{
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case 0x00: /* two byte node id */
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Numeric = tvb_get_guint8(tvb, iOffset);
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proto_tree_add_item(tree, hf_opcua_app_numeric, tvb, iOffset, 1, TRUE);
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iOffset+=1;
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break;
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case 0x01: /* four byte node id */
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NSId = tvb_get_guint8(tvb, iOffset);
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proto_tree_add_item(tree, hf_opcua_app_nsid, tvb, iOffset, 1, TRUE);
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iOffset+=1;
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Numeric = tvb_get_letohs(tvb, iOffset);
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proto_tree_add_item(tree, hf_opcua_app_numeric, tvb, iOffset, 2, TRUE);
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iOffset+=2;
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break;
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case 0x02: /* numeric, that does not fit into four bytes */
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NSId = tvb_get_letohl(tvb, iOffset);
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proto_tree_add_item(tree, hf_opcua_app_nsid, tvb, iOffset, 4, TRUE);
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iOffset+=4;
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Numeric = tvb_get_letohl(tvb, iOffset);
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proto_tree_add_item(tree, hf_opcua_app_numeric, tvb, iOffset, 4, TRUE);
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iOffset+=4;
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break;
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case 0x03: /* string */
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case 0x04: /* uri */
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case 0x05: /* guid */
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case 0x06: /* byte string */
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/* NOT USED */
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break;
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};
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*pOffset = iOffset;
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return Numeric;
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}
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