forked from osmocom/wireshark
116 lines
4.0 KiB
C
116 lines
4.0 KiB
C
/******************************************************************************
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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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******************************************************************************/
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#include "config.h"
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#include <epan/packet.h>
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#include "opcua_application_layer.h"
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/** NodeId encoding mask table */
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static const value_string g_nodeidmasks[] = {
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{ 0x00, "Two byte encoded Numeric" },
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{ 0x01, "Four byte encoded Numeric" },
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{ 0x02, "Numeric of arbitrary length" },
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{ 0x03, "String" },
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{ 0x04, "GUID" },
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{ 0x05, "Opaque" },
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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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/** Register application layer types. */
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void registerApplicationLayerTypes(int proto)
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{
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/** header field definitions */
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static hf_register_info hf[] =
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{
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/* id full name abbreviation type display strings bitmask blurb HFILL */
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{&hf_opcua_nodeid_encodingmask, {"NodeId EncodingMask", "opcua.servicenodeid.encodingmask", FT_UINT8, BASE_HEX, VALS(g_nodeidmasks), 0x0, NULL, HFILL}},
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{&hf_opcua_app_nsid, {"NodeId Namespace Index", "opcua.servicenodeid.nsid", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL}},
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{&hf_opcua_app_numeric, {"NodeId Identifier Numeric", "opcua.servicenodeid.numeric", FT_UINT32, BASE_DEC, VALS(g_requesttypes), 0x0, NULL, HFILL}}
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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)
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{
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gint iOffset = *pOffset;
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guint8 EncodingMask;
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guint32 Numeric = 0;
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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, ENC_LITTLE_ENDIAN);
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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, ENC_LITTLE_ENDIAN);
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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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proto_tree_add_item(tree, hf_opcua_app_nsid, tvb, iOffset, 1, ENC_LITTLE_ENDIAN);
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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, ENC_LITTLE_ENDIAN);
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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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proto_tree_add_item(tree, hf_opcua_app_nsid, tvb, iOffset, 2, ENC_LITTLE_ENDIAN);
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iOffset+=2;
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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, ENC_LITTLE_ENDIAN);
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iOffset+=4;
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break;
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case 0x03: /* string */
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case 0x04: /* guid */
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case 0x05: /* opaque*/
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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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/*
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* Editor modelines - http://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 4
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*
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* vi: set shiftwidth=4 tabstop=8 expandtab:
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* :indentSize=4:tabSize=8:noTabs=true:
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*/
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