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/* packet-dxl.c
*
* Routines for DXL dissection
* Github projects:
* https://github.com/opendxl
*
* Copyright 2018, Dario Lombardo <lomato@gmail.com>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "config.h"
#include <epan/packet.h>
#include <epan/tvbuff.h>
#include <epan/expert.h>
void proto_register_dxl(void);
void proto_reg_handoff_dxl(void);
static int proto_dxl = -1;
static int hf_dxl_version = -1;
static int hf_dxl_type = -1;
static gint ett_dxl = -1;
static expert_field ei_dxl_unsupported = EI_INIT;
static dissector_handle_t msgpack_handle;
#define DXL_REQUEST 0
#define DXL_RESPONSE 1
#define DXL_EVENT 2
#define DXL_ERROR 3
static const value_string dxl_message_types[] = {
{ DXL_REQUEST, "Request" },
{ DXL_RESPONSE, "Response" },
{ DXL_EVENT, "Event" },
{ DXL_ERROR, "Error" },
{ 0, NULL }
};
static void dissect_dxl_event(tvbuff_t* tvb, packet_info* pinfo, proto_tree* dxl_tree, gint* offset)
{
tvbuff_t* tvb_msgpack;
tvb_msgpack = tvb_new_subset_remaining(tvb, *offset);
*offset = call_dissector_with_data(msgpack_handle, tvb_msgpack, pinfo, dxl_tree, "Message ID");
tvb_msgpack = tvb_new_subset_remaining(tvb_msgpack, *offset);
*offset = call_dissector_with_data(msgpack_handle, tvb_msgpack, pinfo, dxl_tree, "Client ID");
tvb_msgpack = tvb_new_subset_remaining(tvb_msgpack, *offset);
*offset = call_dissector_with_data(msgpack_handle, tvb_msgpack, pinfo, dxl_tree, "Source Broker ID");
tvb_msgpack = tvb_new_subset_remaining(tvb_msgpack, *offset);
*offset = call_dissector_with_data(msgpack_handle, tvb_msgpack, pinfo, dxl_tree, "Broker IDs");
tvb_msgpack = tvb_new_subset_remaining(tvb_msgpack, *offset);
*offset = call_dissector_with_data(msgpack_handle, tvb_msgpack, pinfo, dxl_tree, "Client IDs");
tvb_msgpack = tvb_new_subset_remaining(tvb_msgpack, *offset);
*offset = call_dissector_with_data(msgpack_handle, tvb_msgpack, pinfo, dxl_tree, "Payload");
tvb_msgpack = tvb_new_subset_remaining(tvb_msgpack, *offset);
*offset = call_dissector_with_data(msgpack_handle, tvb_msgpack, pinfo, dxl_tree, "Reply to topic");
tvb_msgpack = tvb_new_subset_remaining(tvb_msgpack, *offset);
*offset = call_dissector_with_data(msgpack_handle, tvb_msgpack, pinfo, dxl_tree, "Service ID");
}
static int dissect_dxl(tvbuff_t* tvb, packet_info* pinfo, proto_tree* tree, void* data _U_)
{
gint offset = 0;
proto_item* ti;
proto_tree* dxl_tree;
guint8 type;
ti = proto_tree_add_item(tree, proto_dxl, tvb, 0, -1, ENC_NA);
dxl_tree = proto_item_add_subtree(ti, ett_dxl);
proto_tree_add_item(dxl_tree, hf_dxl_version, tvb, offset, 1, ENC_NA);
offset += 1;
type = tvb_get_guint8(tvb, offset);
proto_tree_add_item(dxl_tree, hf_dxl_type, tvb, offset, 1, ENC_NA);
offset += 1;
switch (type) {
case DXL_REQUEST:
case DXL_RESPONSE:
case DXL_ERROR:
expert_add_info_format(pinfo, tree, &ei_dxl_unsupported, "Type 0x%x is unsupported", type);
break;
case DXL_EVENT:
dissect_dxl_event(tvb, pinfo, dxl_tree, &offset);
break;
}
return offset;
}
void proto_reg_handoff_dxl(void)
{
msgpack_handle = find_dissector("msgpack");
}
void proto_register_dxl(void)
{
expert_module_t* expert_dxl;
static hf_register_info hf[] = {
{ &hf_dxl_version,
{ "Version", "dxl.version", FT_UINT8, BASE_DEC, NULL, 0x00, NULL, HFILL }
},
{ &hf_dxl_type,
{ "Type", "dxl.type", FT_UINT8, BASE_HEX, VALS(dxl_message_types), 0x00, NULL, HFILL }
}
};
static gint* ett[] = {
&ett_dxl
};
proto_dxl = proto_register_protocol("Data Exchange Layer", "DXL", "dxl");
register_dissector("dxl", dissect_dxl, proto_dxl);
proto_register_field_array(proto_dxl, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
static ei_register_info ei[] = {
{ &ei_dxl_unsupported, { "dxl.type.unsupported", PI_UNDECODED, PI_WARN, "Unsupported DXL message", EXPFILL }}
};
expert_dxl = expert_register_protocol(proto_dxl);
expert_register_field_array(expert_dxl, ei, array_length(ei));
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 8
* tab-width: 8
* indent-tabs-mode: t
* End:
*
* vi: set shiftwidth=8 tabstop=8 noexpandtab:
* :indentSize=8:tabSize=8:noTabs=false:
*/
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