/* packet-mdp.c

 * Routines for the disassembly of the "Meraki Discovery Protocol (MDP)"

 *

 * 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>

#define MDP_TLV_TYPE            0

#define MDP_TLV_LENGTH          1

#define MDP_TLV_DEVICE_INFO     2

#define MDP_TLV_NETWORK_INFO    3

#define MDP_TLV_LONGITUDE       4

#define MDP_TLV_LATITUDE        5

#define MDP_TLV_TYPE_SIX        6

#define MDP_TLV_TYPE_SEVEN      7

#define MDP_TLV_END             255

void proto_register_mdp(void);

void proto_reg_handoff_mdp(void);

static int proto_mdp;

static int hf_mdp_preamble_data;

static int hf_mdp_device_info;

static int hf_mdp_network_info;

static int hf_mdp_type;

static int hf_mdp_length;

static int hf_mdp_longitude;

static int hf_mdp_latitude;

static int hf_mdp_type_six;

static int hf_mdp_type_seven;

static int hf_mdp_data;

static int ett_mdp;

static int ett_mdp_tlv;

static dissector_handle_t mdp_handle;

/* Format Identifier */

static const value_string type_vals[] = {

    { MDP_TLV_DEVICE_INFO, "Device Info" },

    { MDP_TLV_NETWORK_INFO, "Network Info" },

    { MDP_TLV_LONGITUDE, "Longitude" },

    { MDP_TLV_LATITUDE, "Latitude" },

    { MDP_TLV_TYPE_SIX, "Type 6 UID" },

    { MDP_TLV_TYPE_SEVEN, "Type 7 UID" },

    { MDP_TLV_END, "End" },

    { 0, NULL }

};

static int

dissect_mdp(tvbuff_t *mdp_tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)

{

    proto_tree  *mdp_tree, *tlv_tree;

    proto_item  *mdp_item, *tlv_item;

    uint32_t    mdp_type, mdp_length;

    unsigned offset = 0;

    col_set_str(pinfo->cinfo, COL_PROTOCOL, "MDP");

    col_set_str(pinfo->cinfo, COL_INFO, "MDP");

    mdp_item = proto_tree_add_item(tree, proto_mdp, mdp_tvb, 0, -1, ENC_NA);

    mdp_tree = proto_item_add_subtree(mdp_item, ett_mdp);

    proto_tree_add_item(mdp_tree, hf_mdp_preamble_data, mdp_tvb, 0, 28, ENC_NA);

    offset += 28;

    while(tvb_reported_length_remaining(mdp_tvb, offset) != 0){

  tlv_tree = proto_tree_add_subtree(mdp_tree, mdp_tvb, offset + MDP_TLV_TYPE, -1, ett_mdp_tlv, &tlv_item, "");

        proto_tree_add_item_ret_uint(tlv_tree, hf_mdp_type, mdp_tvb, offset + MDP_TLV_TYPE, 1, ENC_BIG_ENDIAN, &mdp_type);

        proto_item_set_text(tlv_tree, "%s", val_to_str_const(mdp_type, type_vals, "Unknown type"));

        proto_tree_add_item_ret_uint(tlv_tree, hf_mdp_length, mdp_tvb, offset + MDP_TLV_LENGTH, 1, ENC_BIG_ENDIAN, &mdp_length);

        offset += 2;

        switch(mdp_type){

          case MDP_TLV_DEVICE_INFO:

            proto_tree_add_item(tlv_tree, hf_mdp_device_info, mdp_tvb, offset, mdp_length, ENC_UTF_8);

            break;

          case MDP_TLV_NETWORK_INFO:

            proto_tree_add_item(tlv_tree, hf_mdp_network_info, mdp_tvb, offset, mdp_length, ENC_UTF_8);

             break;

          case MDP_TLV_LONGITUDE:

            proto_tree_add_item(tlv_tree, hf_mdp_longitude, mdp_tvb, offset, mdp_length, ENC_UTF_8);

            break;

          case MDP_TLV_LATITUDE:

            proto_tree_add_item(tlv_tree, hf_mdp_latitude, mdp_tvb, offset, mdp_length, ENC_UTF_8);

            break;

          case MDP_TLV_TYPE_SIX:

            proto_tree_add_item(tlv_tree, hf_mdp_type_six, mdp_tvb, offset, mdp_length, ENC_UTF_8);

            break;

          case MDP_TLV_TYPE_SEVEN:

            proto_tree_add_item(tlv_tree, hf_mdp_type_seven, mdp_tvb, offset, mdp_length, ENC_UTF_8);

            break;

          case MDP_TLV_END:

            break;

          default:

            proto_tree_add_item(mdp_tree, hf_mdp_data, mdp_tvb, offset, mdp_length, ENC_NA);

            break;

        }

        proto_item_set_len(tlv_item, mdp_length + 2);

        offset += mdp_length;

    }

    return tvb_captured_length(mdp_tvb);

}

void

proto_register_mdp(void)

{

    static hf_register_info hf[] = {

        { &hf_mdp_preamble_data, {"Preamble Data","mdp.preamble_data", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},

        { &hf_mdp_device_info, {"Device Info", "mdp.device_info", FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }},

        { &hf_mdp_network_info, {"Network Info", "mdp.network_info", FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }},

        { &hf_mdp_longitude, {"Longitude", "mdp.longitude", FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }},

        { &hf_mdp_latitude, {"Latitude", "mdp.latitude", FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }},

        { &hf_mdp_type, {"Type", "mdp.type", FT_UINT8, BASE_DEC, VALS(type_vals), 0x0, NULL, HFILL }},

        { &hf_mdp_type_six, {"Type 6 UID", "mdp.type_six", FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }},

        { &hf_mdp_type_seven, {"Type 7 UID", "mdp.type_seven", FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }},

        { &hf_mdp_length, {"Length", "mdp.length", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},

        { &hf_mdp_data, {"Unknown Data", "mdp.data", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }}

    };

    static int *ett[] = {

        &ett_mdp,

        &ett_mdp_tlv

    };

    proto_mdp = proto_register_protocol("Meraki Discovery Protocol", "MDP", "mdp");

    proto_register_field_array(proto_mdp, hf, array_length(hf));

    proto_register_subtree_array(ett, array_length(ett));

    mdp_handle = register_dissector("mdp", dissect_mdp, proto_mdp);

}

void

proto_reg_handoff_mdp(void)

{

    dissector_add_uint("ethertype", 0x0712, mdp_handle);

    dissector_add_uint("ethertype", 0x0713, mdp_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:

 */