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/* packet-dpauxmon.c
* Routines for DisplayPort AUX-Channel monitor dissection
* Copyright 2018, Dirk Eibach, Guntermann & Drunck GmbH <dirk.eibach@gdsys.cc>
*
* 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/conversation.h>
#include <epan/proto_data.h>
#include <wiretap/wtap.h>
#include "packet-dpaux.h"
enum {
DPAUXMON_DATA = 0x00,
DPAUXMON_DATA_END = 0x01,
DPAUXMON_EVENT = 0x02,
DPAUXMON_START = 0x03,
DPAUXMON_STOP = 0x04,
DPAUXMON_TS_OVERFLOW = 0x84,
};
void proto_reg_handoff_dpauxmon(void);
void proto_register_dpauxmon(void);
static dissector_handle_t dpaux_handle;
static dissector_handle_t dpauxmon_handle;
/* Initialize the protocol and registered fields */
static int proto_dpauxmon = -1;
static int hf_packet_type = -1;
static int hf_origin = -1;
static int hf_inputs = -1;
static int hf_hpd = -1;
static int hf_in0 = -1;
static int hf_in1 = -1;
static int hf_in2 = -1;
static int * const input_fields[] = {
&hf_hpd,
&hf_in0,
&hf_in1,
&hf_in2,
NULL
};
/* Initialize the subtree pointers */
static gint ett_dpauxmon = -1;
static const value_string packet_type_vals[] = {
{ DPAUXMON_DATA, "Data" },
{ DPAUXMON_EVENT, "Event" },
{ DPAUXMON_START, "Start" },
{ DPAUXMON_STOP, "Stop" },
{ DPAUXMON_TS_OVERFLOW, "Timestamp Overflow" },
{ 0, NULL }
};
static const value_string origin_vals[] = {
{ 0, "Sink" },
{ 1, "Source" },
{ 0, NULL }
};
static int
dissect_dpauxmon(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
void *data _U_)
{
proto_item *ti;
proto_tree *dpauxmon_tree;
guint32 packet_type;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "DPAUXMON");
col_set_str(pinfo->cinfo, COL_RES_DL_DST, "N/A");
col_set_str(pinfo->cinfo, COL_RES_DL_SRC, "Internal");
/* create display subtree for the protocol */
ti = proto_tree_add_item(tree, proto_dpauxmon, tvb, 0, -1, ENC_NA);
dpauxmon_tree = proto_item_add_subtree(ti, ett_dpauxmon);
proto_tree_add_item_ret_uint(dpauxmon_tree, hf_packet_type, tvb, 0, 1, ENC_NA, &packet_type);
col_add_fstr(pinfo->cinfo, COL_INFO, "DisplayPort AUX channel - %s", val_to_str_const(packet_type, packet_type_vals, "Unknown"));
switch (packet_type) {
case DPAUXMON_DATA: {
struct dpaux_info dpaux_info;
dpaux_info.from_source = tvb_get_guint8(tvb, 1);
proto_tree_add_uint(dpauxmon_tree, hf_origin, tvb, 1, 1, dpaux_info.from_source);
call_dissector_with_data(dpaux_handle, tvb_new_subset_remaining(tvb, 2),
pinfo, dpauxmon_tree, &dpaux_info);
break;
}
case DPAUXMON_EVENT:
case DPAUXMON_START:
proto_tree_add_bitmask(dpauxmon_tree, tvb, 1, hf_inputs, 0, input_fields,
ENC_BIG_ENDIAN);
break;
case DPAUXMON_STOP:
break;
case DPAUXMON_TS_OVERFLOW:
break;
};
return tvb_captured_length(tvb);
}
void
proto_register_dpauxmon(void)
{
/* Setup protocol subtree array */
static gint *ett[] = {
&ett_dpauxmon
};
/* Setup list of header fields See Section 1.5 of README.dissector for
* details. */
static hf_register_info hf[] = {
{ &hf_packet_type,
{ "Packet Type", "dpauxmon.packet_type",
FT_UINT8, BASE_DEC, VALS(packet_type_vals), 0,
NULL, HFILL }
},
{ &hf_origin,
{ "Origin", "dpauxmon.origin",
FT_UINT8, BASE_DEC, VALS(origin_vals), 0,
NULL, HFILL }
},
{ &hf_inputs,
{ "Inputs", "dpauxmon.inputs",
FT_UINT8, BASE_HEX, NULL, 0,
NULL, HFILL }
},
{ &hf_hpd,
{ "Hotplug Detect", "dpauxmon.hpd",
FT_BOOLEAN, 4, NULL, 0x1,
NULL, HFILL }
},
{ &hf_in0,
{ "IN0", "dpauxmon.in0",
FT_BOOLEAN, 4, NULL, 0x2,
NULL, HFILL }
},
{ &hf_in1,
{ "IN1", "dpauxmon.in1",
FT_BOOLEAN, 4, NULL, 0x4,
NULL, HFILL }
},
{ &hf_in2,
{ "IN2", "dpauxmon.in2",
FT_BOOLEAN, 4, NULL, 0x8,
NULL, HFILL }
},
};
/* Register the protocol name and description */
proto_dpauxmon = proto_register_protocol("DPAUXMON DisplayPort AUX channel monitor", "DPAUXMON", "dpauxmon");
proto_register_field_array(proto_dpauxmon, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
dpauxmon_handle = register_dissector("dpauxmon", dissect_dpauxmon, proto_dpauxmon);
}
void
proto_reg_handoff_dpauxmon(void)
{
static gboolean initialized = FALSE;
dpaux_handle = find_dissector_add_dependency("dpaux", proto_dpauxmon);
if (!initialized) {
initialized = TRUE;
} else {
dissector_delete_uint("wtap_encap", WTAP_ENCAP_DPAUXMON, dpauxmon_handle);
}
dissector_add_uint("wtap_encap", WTAP_ENCAP_DPAUXMON, dpauxmon_handle);
}
/*
* Editor modelines - https://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:
*/
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