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/* 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 = -1;
static int hf_mdp_preamble_data = -1;
static int hf_mdp_device_info = -1;
static int hf_mdp_network_info = -1;
static int hf_mdp_type = -1;
static int hf_mdp_length = -1;
static int hf_mdp_longitude = -1;
static int hf_mdp_latitude = -1;
static int hf_mdp_type_six = -1;
static int hf_mdp_type_seven = -1;
static int hf_mdp_data = -1;
static gint ett_mdp = -1;
static gint ett_mdp_tlv = -1;
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;
guint32 mdp_type, mdp_length;
gint offset = 0;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "MDP");
col_clear(pinfo->cinfo, COL_INFO);
col_add_fstr(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 | ENC_NA);
break;
case MDP_TLV_NETWORK_INFO:
proto_tree_add_item(tlv_tree, hf_mdp_network_info, mdp_tvb, offset, mdp_length, ENC_UTF_8 | ENC_NA);
break;
case MDP_TLV_LONGITUDE:
proto_tree_add_item(tlv_tree, hf_mdp_longitude, mdp_tvb, offset, mdp_length, ENC_UTF_8 | ENC_NA);
break;
case MDP_TLV_LATITUDE:
proto_tree_add_item(tlv_tree, hf_mdp_latitude, mdp_tvb, offset, mdp_length, ENC_UTF_8 | ENC_NA);
break;
case MDP_TLV_TYPE_SIX:
proto_tree_add_item(tlv_tree, hf_mdp_type_six, mdp_tvb, offset, mdp_length, ENC_UTF_8 | ENC_NA);
break;
case MDP_TLV_TYPE_SEVEN:
proto_tree_add_item(tlv_tree, hf_mdp_type_seven, mdp_tvb, offset, mdp_length, ENC_UTF_8 | ENC_NA);
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 gint *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:
*/
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