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/* packet-nwmtp.c
* Routines for NexusWare MTP3 over UDP transport
* Copyright 2010 by Holger Hans Peter Freyther <zecke@selfish.org>
* Copyright 2010 by On-Waves
*
* 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>
void proto_register_mwmtp(void);
void proto_reg_handoff_nwmtp(void);
static dissector_handle_t mtp_handle;
static int proto_nwmtp;
static int hf_nwmtp_transp_type;
static int hf_nwmtp_user_context;
static int hf_nwmtp_data_type;
static int hf_nwmtp_data_index;
static int hf_nwmtp_data_length;
/* subtree pointer */
static int ett_mwmtp;
static dissector_handle_t nwmtp_handle;
static const value_string nwmtp_transport_type_vals[] = {
{ 2, "UDP" },
{ 3, "TCP" },
{ 0, NULL },
};
static const value_string nwmtp_data_type_vals[] = {
{ 0, "MSU Prio 0" },
{ 1, "MSU Prio 1" },
{ 2, "MSU Prio 2" },
{ 3, "MSU Prio 3" },
{16, "Retrieved MSU Prio 0" },
{17, "Retrieved MSU Prio 0" },
{18, "Retrieved MSU Prio 0" },
{32, "Retrieval complete" },
{33, "Retrieval impossible" },
{34, "Link in service" },
{35, "Link out of service" },
{ 0, NULL },
};
static int dissect_nwmtp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
int offset = 0;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "NW MTP");
col_clear(pinfo->cinfo, COL_INFO);
while (tvb_reported_length_remaining(tvb, offset) > 0) {
const char *type;
proto_item *ti;
proto_item *nwmtp_tree;
uint32_t len;
tvbuff_t *next_tvb;
/* update the info column */
type = val_to_str_const(tvb_get_uint8(tvb, offset + 1),
nwmtp_data_type_vals, "Unknown");
col_set_str(pinfo->cinfo, COL_INFO, type);
len = tvb_get_ntohl(tvb, offset + 8);
if (tree) {
ti = proto_tree_add_protocol_format(tree, proto_nwmtp,
tvb, offset, len + 12,
"NexusWare C7 UDP Protocol");
nwmtp_tree = proto_item_add_subtree(ti, ett_mwmtp);
proto_tree_add_item(nwmtp_tree, hf_nwmtp_transp_type,
tvb, offset, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(nwmtp_tree, hf_nwmtp_data_type,
tvb, offset + 1, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(nwmtp_tree, hf_nwmtp_data_index,
tvb, offset + 2, 2, ENC_BIG_ENDIAN);
proto_tree_add_item(nwmtp_tree, hf_nwmtp_user_context,
tvb, offset + 4, 4, ENC_BIG_ENDIAN);
proto_tree_add_item(nwmtp_tree, hf_nwmtp_data_length,
tvb, offset + 8, 4, ENC_BIG_ENDIAN);
}
next_tvb = tvb_new_subset_length(tvb, offset + 12, len);
if (tvb_reported_length(next_tvb) > 0)
call_dissector(mtp_handle, next_tvb, pinfo, tree);
/* Check for overflows, which probably can't happen, but better
* safe than sorry. See
* https://gitlab.com/wireshark/wireshark/-/issues/8169
*/
DISSECTOR_ASSERT(len < UINT32_MAX - 11);
DISSECTOR_ASSERT((uint64_t)offset + len + 12 < INT_MAX);
offset += len + 12;
}
return tvb_captured_length(tvb);
}
void proto_register_mwmtp(void)
{
static hf_register_info hf[] = {
{&hf_nwmtp_transp_type,
{"Transport Type", "nwmtp.transp_type",
FT_UINT8, BASE_DEC, VALS(nwmtp_transport_type_vals), 0x0,
"The Transport Type", HFILL}
},
{&hf_nwmtp_data_type,
{"Data Type", "nwmtp.data_type",
FT_UINT8, BASE_DEC, VALS(nwmtp_data_type_vals), 0x0,
"The Data Type", HFILL}
},
{&hf_nwmtp_data_index,
{"Link Index", "nwmtp.link_index",
FT_UINT16, BASE_DEC, NULL, 0x0,
NULL, HFILL}
},
{&hf_nwmtp_user_context,
{"User Context", "nwmtp.user_context",
FT_UINT32, BASE_DEC, NULL, 0x0,
"Use Context", HFILL}
},
{&hf_nwmtp_data_length,
{"Length", "nwmtp.data_length",
FT_UINT32, BASE_DEC, NULL, 0x0,
"Data Length", HFILL}
},
};
static int *ett[] = {
&ett_mwmtp,
};
proto_nwmtp =
proto_register_protocol("NexusWare C7 MTP", "MTP over NW UDP", "nw_mtp");
proto_register_field_array(proto_nwmtp, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
nwmtp_handle = register_dissector("nw_mtp", dissect_nwmtp, proto_nwmtp);
}
void proto_reg_handoff_nwmtp(void)
{
dissector_add_for_decode_as_with_preference("udp.port", nwmtp_handle);
mtp_handle = find_dissector_add_dependency("mtp3", proto_nwmtp);
}
/*
* 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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