diff options
Diffstat (limited to 'plugins/epan/opcua/opcua_application_layer.c')
| -rw-r--r-- | plugins/epan/opcua/opcua_application_layer.c | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/plugins/epan/opcua/opcua_application_layer.c b/plugins/epan/opcua/opcua_application_layer.c new file mode 100644 index 0000000000..df627b3210 --- /dev/null +++ b/plugins/epan/opcua/opcua_application_layer.c @@ -0,0 +1,115 @@ +/****************************************************************************** +** 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: + */ |