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/******************************************************************************
** $Id$
**
** 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 Transport Layer Decoder.
**
** Author: Gerhard Gappmeier <gerhard.gappmeier@ascolab.com>
** Last change by: $Author: gergap $
**
******************************************************************************/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <gmodule.h>
#include <epan/packet.h>
#include "opcua_security_layer.h"
#include "opcua_application_layer.h"
#include "opcua_simpletypes.h"
#include <string.h>
#include <epan/emem.h>
void dispatchService(proto_tree *tree, tvbuff_t *tvb, gint *pOffset, int ServiceId);
static int hf_opcua_transport_sig = -1;
static int hf_opcua_transport_len = -1;
static int hf_opcua_transport_ver = -1;
static int hf_opcua_transport_cid = -1;
static int hf_opcua_transport_lifetime = -1;
static int hf_opcua_transport_sbl = -1;
static int hf_opcua_transport_rbl = -1;
static int hf_opcua_transport_endpoint = -1;
static int hf_opcua_transport_rlifetime = -1;
static int hf_opcua_transport_rsbl = -1;
static int hf_opcua_transport_rrbl = -1;
static int hf_opcua_transport_altendpoint = -1;
static int hf_opcua_transport_rqid = -1;
static int hf_opcua_transport_status = -1;
extern gint ett_opcua_nodeid;
static hf_register_info hf[] =
{
{ &hf_opcua_transport_sig,
/* full name , abbreviation , type , display , strings, bitmask, blurb, id, parent, ref_count, bitshift */
{ "Signature", "transport.sig", FT_STRING, BASE_NONE, NULL, 0x0, "", HFILL }
},
{ &hf_opcua_transport_len,
{ "Message Length", "transport.len", FT_UINT32, BASE_DEC, NULL, 0x0, "", HFILL }
},
{ &hf_opcua_transport_ver,
{ "Version", "transport.ver", FT_UINT32, BASE_DEC, NULL, 0x0, "", HFILL }
},
{ &hf_opcua_transport_cid,
{ "ConnectionId", "transport.cid", FT_GUID, BASE_NONE, NULL, 0x0, "", HFILL }
},
{ &hf_opcua_transport_lifetime,
{ "Lifetime", "transport.lifetime", FT_UINT32, BASE_DEC, NULL, 0x0, "", HFILL }
},
{ &hf_opcua_transport_sbl,
{ "SendBufferLength", "transport.sbl", FT_UINT32, BASE_DEC, NULL, 0x0, "", HFILL }
},
{ &hf_opcua_transport_rbl,
{ "ReceiveBufferLength", "transport.rbl", FT_UINT32, BASE_DEC, NULL, 0x0, "", HFILL }
},
{ &hf_opcua_transport_endpoint,
{ "EndPoint", "transport.endpoint", FT_STRING, BASE_NONE, NULL, 0x0, "", HFILL }
},
{ &hf_opcua_transport_rlifetime,
{ "Revised Lifetime", "transport.rlifetime", FT_UINT32, BASE_DEC, NULL, 0x0, "", HFILL }
},
{ &hf_opcua_transport_rsbl,
{ "Revised SendBufferLength", "transport.rsbl", FT_UINT32, BASE_DEC, NULL, 0x0, "", HFILL }
},
{ &hf_opcua_transport_rrbl,
{ "Revised ReceiveBufferLength", "transport.rrbl", FT_UINT32, BASE_DEC, NULL, 0x0, "", HFILL }
},
{ &hf_opcua_transport_altendpoint,
{ "Alternate EndPoint", "transport.altendpoint", FT_STRING, BASE_NONE, NULL, 0x0, "", HFILL }
},
{ &hf_opcua_transport_rqid,
{ "RequestId", "transport.rqid", FT_UINT32, BASE_DEC, NULL, 0x0, "", HFILL }
},
{ &hf_opcua_transport_status,
{ "StatusCode", "transport.status", FT_UINT32, BASE_DEC, NULL, 0x0, "", HFILL }
}
};
/** subtree types */
extern gint ett_opcua_extensionobject;
/** Register transport layer types. */
void registerTransportLayerTypes(int proto)
{
proto_register_field_array(proto, hf, array_length(hf));
}
/** helper functions for adding strings,
* that are not zero terminated.
*/
void addString(proto_tree *tree,
int hfindex,
tvbuff_t *tvb,
gint start,
gint length,
const char *value)
{
char *szValue = ep_alloc(256);
if (szValue)
{
if (length > 255) length = 255;
/* copy non null terminated string data */
strncpy(szValue, value, length);
/* set null terminator */
szValue[length] = 0;
proto_tree_add_string(tree, hfindex, tvb, start, length, szValue);
}
}
/* Transport Layer: message parsers */
void parseHello(proto_tree *tree, tvbuff_t *tvb, gint *pOffset)
{
addString(tree, hf_opcua_transport_sig, tvb, *pOffset, 4, tvb->real_data); *pOffset+=4;
proto_tree_add_item(tree, hf_opcua_transport_len, tvb, *pOffset, 4, TRUE); *pOffset+=4;
proto_tree_add_item(tree, hf_opcua_transport_ver, tvb, *pOffset, 4, TRUE); *pOffset+=4;
proto_tree_add_item(tree, hf_opcua_transport_cid, tvb, *pOffset, 16, TRUE); *pOffset+=16;
proto_tree_add_item(tree, hf_opcua_transport_lifetime, tvb, *pOffset, 4, TRUE); *pOffset+=4;
proto_tree_add_item(tree, hf_opcua_transport_sbl, tvb, *pOffset, 4, TRUE); *pOffset+=4;
proto_tree_add_item(tree, hf_opcua_transport_rbl, tvb, *pOffset, 4, TRUE); *pOffset+=4;
parseString(tree, tvb, pOffset, hf_opcua_transport_endpoint);
}
void parseAcknowledge(proto_tree *tree, tvbuff_t *tvb, gint *pOffset)
{
addString(tree, hf_opcua_transport_sig, tvb, *pOffset, 4, tvb->real_data); *pOffset+=4;
proto_tree_add_item(tree, hf_opcua_transport_len, tvb, *pOffset, 4, TRUE); *pOffset+=4;
proto_tree_add_item(tree, hf_opcua_transport_cid, tvb, *pOffset, 16, TRUE); *pOffset+=16;
proto_tree_add_item(tree, hf_opcua_transport_rlifetime, tvb, *pOffset, 4, TRUE); *pOffset+=4;
proto_tree_add_item(tree, hf_opcua_transport_rsbl, tvb, *pOffset, 4, TRUE); *pOffset+=4;
proto_tree_add_item(tree, hf_opcua_transport_rrbl, tvb, *pOffset, 4, TRUE); *pOffset+=4;
parseString(tree, tvb, pOffset, hf_opcua_transport_altendpoint);
}
void parseDisconnect(proto_tree *tree, tvbuff_t *tvb, gint *pOffset)
{
addString(tree, hf_opcua_transport_sig, tvb, *pOffset, 4, tvb->real_data); *pOffset+=4;
proto_tree_add_item(tree, hf_opcua_transport_len, tvb, *pOffset, 4, TRUE); *pOffset+=4;
proto_tree_add_item(tree, hf_opcua_transport_cid, tvb, *pOffset, 16, TRUE); *pOffset+=16;
}
void parseData(proto_tree *tree, tvbuff_t *tvb, gint *pOffset)
{
proto_item *ti;
proto_tree *encobj_tree;
proto_tree *nodeid_tree;
int ServiceId = 0;
addString(tree, hf_opcua_transport_sig, tvb, *pOffset, 4, tvb->real_data); *pOffset+=4;
proto_tree_add_item(tree, hf_opcua_transport_len, tvb, *pOffset, 4, TRUE); *pOffset+=4;
proto_tree_add_item(tree, hf_opcua_transport_cid, tvb, *pOffset, 16, TRUE); *pOffset+=16;
proto_tree_add_item(tree, hf_opcua_transport_rqid, tvb, *pOffset, 4, TRUE); *pOffset+=4;
/* message data contains the security layer */
parseSecurityLayer(tree, tvb, pOffset);
/* AT THE MOMENT NO SECURITY IS IMPLEMENTED IN UA.
* WE CAN JUST JUMP INTO THE APPLICATION LAYER DATA.
* THIS WILL CHAHNGE IN THE FUTURE. */
/* add encodeable object subtree */
ti = proto_tree_add_text(tree, tvb, 0, -1, "Message : Encodeable Object");
encobj_tree = proto_item_add_subtree(ti, ett_opcua_extensionobject);
/* add nodeid subtree */
ti = proto_tree_add_text(encobj_tree, tvb, 0, -1, "TypeId : ExpandedNodeId");
nodeid_tree = proto_item_add_subtree(ti, ett_opcua_nodeid);
ServiceId = parseServiceNodeId(nodeid_tree, tvb, pOffset, "NodeId") - 1;
dispatchService(encobj_tree, tvb, pOffset, ServiceId);
}
void parseAbort(proto_tree *tree, tvbuff_t *tvb, gint *pOffset)
{
addString(tree, hf_opcua_transport_sig, tvb, *pOffset, 4, tvb->real_data); *pOffset+=4;
proto_tree_add_item(tree, hf_opcua_transport_len, tvb, *pOffset, 4, TRUE); *pOffset+=4;
proto_tree_add_item(tree, hf_opcua_transport_cid, tvb, *pOffset, 16, TRUE); *pOffset+=16;
proto_tree_add_item(tree, hf_opcua_transport_rqid, tvb, *pOffset, 4, TRUE); *pOffset+=4;
}
void parseError(proto_tree *tree, tvbuff_t *tvb, gint *pOffset)
{
addString(tree, hf_opcua_transport_sig, tvb, *pOffset, 4, tvb->real_data); *pOffset+=4;
proto_tree_add_item(tree, hf_opcua_transport_len, tvb, *pOffset, 4, TRUE); *pOffset+=4;
proto_tree_add_item(tree, hf_opcua_transport_cid, tvb, *pOffset, 16, TRUE); *pOffset+=16;
proto_tree_add_item(tree, hf_opcua_transport_rqid, tvb, *pOffset, 4, TRUE); *pOffset+=4;
proto_tree_add_item(tree, hf_opcua_transport_status, tvb, *pOffset, 4, TRUE); *pOffset+=4;
}
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