/* packet-telkonet.c
 * Routines for ethertype 0x88A1 tunneling dissection
 *
 * Copyright 2006 Joerg Mayer (see AUTHORS file)
 *
 * Wireshark - Network traffic analyzer
 * By Gerald Combs <gerald@wireshark.org>
 * Copyright 1998 Gerald Combs
 *
 * SPDX-License-Identifier: GPL-2.0-or-later
 */

/* 2do:
 * - find out more about the real meaning of the 8 bytes
 *   and possible other packet types
 * - Telkonet (www.telkonet.com) has registered other ethertypes
 *   as well: find out what they do
 */

#include "config.h"

#include <epan/packet.h>
#include <epan/etypes.h>

void proto_reg_handoff_telkonet(void);
void proto_register_telkonet(void);

static int proto_telkonet;
static int hf_telkonet_type;

static int ett_telkonet;

static dissector_handle_t telkonet_handle;
static dissector_handle_t eth_withoutfcs_handle;

typedef enum {
	TELKONET_TYPE_TUNNEL = 0x78
} telkonet_type_t;

static const value_string telkonet_type_vals[] = {
	{ TELKONET_TYPE_TUNNEL,	"tunnel" },

	{ 0x00,	NULL }
};

static int
dissect_telkonet(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
	proto_tree *ti, *telkonet_tree;
	int offset = 0;
	telkonet_type_t type;

	col_set_str(pinfo->cinfo, COL_PROTOCOL, "TELKONET");
	col_clear(pinfo->cinfo, COL_INFO);

	type = (telkonet_type_t)tvb_get_uint8(tvb, offset);
	col_add_fstr(pinfo->cinfo, COL_INFO, "Telkonet type: %s",
		val_to_str(type, telkonet_type_vals, "Unknown (0x%02x)"));

	ti = proto_tree_add_item(tree, proto_telkonet, tvb, 0, 8, ENC_NA);
	telkonet_tree = proto_item_add_subtree(ti, ett_telkonet);

	proto_tree_add_item(telkonet_tree, hf_telkonet_type, tvb, 0, 8, ENC_NA);
	offset += 8;

	if (type == TELKONET_TYPE_TUNNEL)
		call_dissector(eth_withoutfcs_handle, tvb_new_subset_remaining(tvb, offset),
			pinfo, tree);

	return tvb_captured_length(tvb);
}

void
proto_register_telkonet(void)
{
	static hf_register_info hf[] = {
		{ &hf_telkonet_type,
		{ "Type", "telkonet.type", FT_BYTES, BASE_NONE, NULL,
			0x0, "TELKONET type", HFILL }},
	};
	static int *ett[] = {
		&ett_telkonet,
	};

	proto_telkonet = proto_register_protocol("Telkonet powerline", "TELKONET", "telkonet");
	proto_register_field_array(proto_telkonet, hf, array_length(hf));
	proto_register_subtree_array(ett, array_length(ett));
	telkonet_handle = register_dissector("telkonet", dissect_telkonet, proto_telkonet);
}

void
proto_reg_handoff_telkonet(void)
{
	eth_withoutfcs_handle = find_dissector_add_dependency("eth_withoutfcs", proto_telkonet);

	dissector_add_uint("ethertype", ETHERTYPE_TELKONET, telkonet_handle);
}

/*
 * 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:
 */