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|
/* packet-turbocell.c
* Routines for Turbocell Header dissection
* Copyright 2004, Colin Slater <kiltedtaco@xxxxxxxxx>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
/* This dissector was written entirely from reverse engineering captured
* packets. No documentation was used or supplied by Karlnet. Hence, this
* dissector is very incomplete. If you have any insight into decoding
* these packets, or if you can supply packet captures from turbocell
* networks, contact kiltedtaco@xxxxxxxxx */
/* 2008-08-05 : Added support for aggregate frames.
* AP mode, NWID and sat mode fields identification were
* taken from http://aphopper.sourceforge.net/turbocell.html
* everything else is based on (educated) guesses.
*/
#include "config.h"
#include <epan/packet.h>
#include <epan/strutil.h>
#define TURBOCELL_TYPE_BEACON_NON_POLLING 0x00
#define TURBOCELL_TYPE_BEACON_NORMAL 0x40
#define TURBOCELL_TYPE_BEACON_POLLING 0x80
#define TURBOCELL_TYPE_BEACON_ISP 0xA0
#define TURBOCELL_TYPE_DATA 0x01
#define TURBOCELL_TYPE_MANAGEMENT 0x11
#define TURBOCELL_SATTELITE_MODE_DENY 0x1
#define TURBOCELL_SATTELITE_MODE_ALLOW 0x2
void proto_register_turbocell(void);
void proto_reg_handoff_turbocell(void);
static int proto_turbocell;
static int proto_aggregate;
static int hf_turbocell_type;
static int hf_turbocell_dst;
static int hf_turbocell_counter;
static int hf_turbocell_name;
static int hf_turbocell_nwid;
static int hf_turbocell_satmode;
static int hf_turbocell_unknown;
static int hf_turbocell_timestamp;
static int hf_turbocell_station;
static int hf_turbocell_ip;
static int hf_turbocell_aggregate_msdu_header_text;
static int hf_turbocell_aggregate_msdu_len;
static int hf_turbocell_aggregate_unknown1;
static int hf_turbocell_aggregate_unknown2;
static int hf_turbocell_aggregate_len;
static int ett_turbocell;
static int ett_network;
static int ett_msdu_aggregation_parent_tree;
static int ett_msdu_aggregation_subframe_tree;
/* The ethernet dissector we hand off to */
static dissector_handle_t eth_handle;
static const value_string turbocell_type_values[] = {
{ TURBOCELL_TYPE_BEACON_NON_POLLING, "Beacon (Non-Polling Base Station)" },
{ TURBOCELL_TYPE_BEACON_NORMAL, "Beacon (Normal Base Station)" },
{ TURBOCELL_TYPE_BEACON_POLLING, "Beacon (Polling Base Station)" },
{ TURBOCELL_TYPE_BEACON_ISP, "Beacon (ISP Base Station)" },
{ TURBOCELL_TYPE_DATA, "Data Packet" },
{ TURBOCELL_TYPE_MANAGEMENT, "Management Packet" },
{ 0, NULL }
};
static const value_string turbocell_satmode_values[] = {
{ TURBOCELL_SATTELITE_MODE_DENY, "Allowed to connect" },
{ TURBOCELL_SATTELITE_MODE_ALLOW, "NOT allowed to connect" },
{ 0, NULL }
};
static int
dissect_turbocell(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
proto_item *ti, *name_item;
proto_tree *turbocell_tree = NULL, *network_tree;
tvbuff_t *next_tvb;
int i=0;
uint8_t packet_type;
uint8_t * str_name;
unsigned str_len;
int remaining_length;
packet_type = tvb_get_uint8(tvb, 0);
if (!(packet_type & 0x0F)){
col_set_str(pinfo->cinfo, COL_INFO, "Turbocell Packet (Beacon)");
col_set_str(pinfo->cinfo, COL_PROTOCOL, "Turbocell");
} else if ( packet_type == TURBOCELL_TYPE_MANAGEMENT ) {
col_set_str(pinfo->cinfo, COL_INFO, "Turbocell Packet (Management)");
col_set_str(pinfo->cinfo, COL_PROTOCOL, "Turbocell");
} else if ( packet_type == TURBOCELL_TYPE_DATA ) {
col_set_str(pinfo->cinfo, COL_INFO, "Turbocell Packet (Data)");
col_set_str(pinfo->cinfo, COL_PROTOCOL, "Turbocell");
} else {
col_set_str(pinfo->cinfo, COL_INFO, "Turbocell Packet (Unknown)");
col_set_str(pinfo->cinfo, COL_PROTOCOL, "Turbocell");
}
if (tree) {
ti = proto_tree_add_item(tree, proto_turbocell, tvb, 0, 20, ENC_NA);
turbocell_tree = proto_item_add_subtree(ti, ett_turbocell);
proto_tree_add_item(turbocell_tree, hf_turbocell_type, tvb, 0, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(turbocell_tree, hf_turbocell_satmode, tvb, 1, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(turbocell_tree, hf_turbocell_nwid, tvb, 1, 1, ENC_BIG_ENDIAN);
/* it seem when we have this magic number,that means an alternate header version */
if (tvb_get_bits64(tvb, 64,48,ENC_BIG_ENDIAN) != INT64_C(0x000001fe23dc45ba)){
proto_tree_add_item(turbocell_tree, hf_turbocell_counter, tvb, 0x02, 2, ENC_BIG_ENDIAN);
proto_tree_add_item(turbocell_tree, hf_turbocell_dst, tvb, 0x04, 6, ENC_NA);
proto_tree_add_item(turbocell_tree, hf_turbocell_timestamp, tvb, 0x0A, 3, ENC_BIG_ENDIAN);
} else {
proto_tree_add_item(turbocell_tree, hf_turbocell_timestamp, tvb, 0x02, 3, ENC_BIG_ENDIAN);
proto_tree_add_item(turbocell_tree, hf_turbocell_counter, tvb, 0x05, 3, ENC_BIG_ENDIAN);
proto_tree_add_item(turbocell_tree, hf_turbocell_dst, tvb, 0x08, 6, ENC_NA);
}
proto_tree_add_item(turbocell_tree, hf_turbocell_unknown, tvb, 0x0E, 2, ENC_BIG_ENDIAN);
proto_tree_add_item(turbocell_tree, hf_turbocell_ip, tvb, 0x10, 4, ENC_BIG_ENDIAN);
}
remaining_length=tvb_reported_length_remaining(tvb, 0x14);
if (remaining_length > 6) {
/* If the first character is a printable character that means we have a payload with network info */
/* I couldn't find anything in the header that would definitively indicate if payload is either data or network info */
/* Since the frame size is limited this should work ok */
if (tvb_get_uint8(tvb, 0x14)>=0x20){
name_item = proto_tree_add_item(turbocell_tree, hf_turbocell_name, tvb, 0x14, 30, ENC_ASCII);
network_tree = proto_item_add_subtree(name_item, ett_network);
str_name=tvb_get_stringz_enc(pinfo->pool, tvb, 0x14, &str_len, ENC_ASCII);
col_append_fstr(pinfo->cinfo, COL_INFO, ", Network=\"%s\"", format_text(pinfo->pool, str_name, str_len-1));
while(tvb_get_uint8(tvb, 0x34 + 8*i)==0x00 && (tvb_reported_length_remaining(tvb,0x34 + 8*i) > 6) && (i<32)) {
proto_tree_add_item(network_tree, hf_turbocell_station, tvb, 0x34+8*i, 6, ENC_NA);
i++;
}
/*Couldn't make sense of the apparently random data in the end*/
next_tvb = tvb_new_subset_remaining(tvb, 0x34 + 8*i);
call_data_dissector(next_tvb, pinfo, tree);
} else {
tvbuff_t *msdu_tvb = NULL;
uint32_t msdu_offset = 0x04;
uint16_t j = 1;
uint16_t msdu_length;
proto_item *parent_item;
proto_tree *mpdu_tree;
proto_tree *subframe_tree;
next_tvb = tvb_new_subset_length(tvb, 0x14, tvb_get_ntohs(tvb, 0x14));
parent_item = proto_tree_add_protocol_format(tree, proto_aggregate, next_tvb, 0,
tvb_reported_length_remaining(next_tvb, 0), "Turbocell Aggregate Frames");
mpdu_tree = proto_item_add_subtree(parent_item, ett_msdu_aggregation_parent_tree);
proto_tree_add_item(mpdu_tree, hf_turbocell_aggregate_len, next_tvb, 0x00, 2, ENC_BIG_ENDIAN);
proto_tree_add_item(mpdu_tree, hf_turbocell_aggregate_unknown1, next_tvb, 0x02, 2, ENC_BIG_ENDIAN);
remaining_length=tvb_reported_length_remaining(next_tvb, msdu_offset);
do {
msdu_length = (tvb_get_letohs(next_tvb, msdu_offset) & 0x0FFF);
if (msdu_length==0) break;
parent_item = proto_tree_add_uint_format(mpdu_tree, hf_turbocell_aggregate_msdu_header_text,
next_tvb,msdu_offset, msdu_length + 0x02,j, "A-MSDU Subframe #%u", j);
subframe_tree = proto_item_add_subtree(parent_item, ett_msdu_aggregation_subframe_tree);
j++;
proto_tree_add_item(subframe_tree, hf_turbocell_aggregate_msdu_len, next_tvb, msdu_offset, 2, ENC_LITTLE_ENDIAN);
proto_tree_add_item(subframe_tree, hf_turbocell_aggregate_unknown2, next_tvb, msdu_offset+1, 1, ENC_BIG_ENDIAN);
msdu_offset += 0x02;
remaining_length -= 0x02;
msdu_tvb = tvb_new_subset_length_caplen(next_tvb, msdu_offset, (msdu_length>remaining_length)?remaining_length:msdu_length, msdu_length);
call_dissector(eth_handle, msdu_tvb, pinfo, subframe_tree);
msdu_offset += msdu_length;
remaining_length -= msdu_length;
} while (remaining_length > 6);
if (remaining_length > 2) {
next_tvb = tvb_new_subset_remaining(next_tvb, msdu_offset);
call_data_dissector(next_tvb, pinfo, tree);
}
}
}
return tvb_captured_length(tvb);
}
/* Register the protocol with Wireshark */
void proto_register_turbocell(void)
{
static hf_register_info hf[] = {
{ &hf_turbocell_type,
{ "Packet Type", "turbocell.type",
FT_UINT8, BASE_HEX, VALS(turbocell_type_values), 0,
NULL, HFILL }
},
{ &hf_turbocell_satmode,
{ "Satellite Mode", "turbocell.satmode",
FT_UINT8, BASE_HEX, VALS(turbocell_satmode_values), 0xF0,
NULL, HFILL }
},
{ &hf_turbocell_nwid,
{ "Network ID", "turbocell.nwid",
FT_UINT8, BASE_DEC, NULL, 0x0F,
NULL, HFILL }
},
{ &hf_turbocell_counter,
{ "Counter", "turbocell.counter",
FT_UINT24, BASE_DEC_HEX, NULL, 0,
"Increments every frame (per station)", HFILL }
},
{ &hf_turbocell_dst,
{ "Destination", "turbocell.dst",
FT_ETHER, BASE_NONE, NULL, 0,
"Seems to be the destination", HFILL }
},
{ &hf_turbocell_ip,
{ "IP", "turbocell.ip",
FT_IPv4, BASE_NONE, NULL, 0,
"IP address of base station ?", HFILL }
},
{ &hf_turbocell_unknown,
{ "Unknown", "turbocell.unknown",
FT_UINT16, BASE_HEX, NULL, 0,
"Always 0000", HFILL }
},
{ &hf_turbocell_timestamp,
{ "Timestamp (in 10 ms)", "turbocell.timestamp",
FT_UINT24, BASE_DEC_HEX, NULL, 0,
"Timestamp per station (since connection?)", HFILL }
},
{ &hf_turbocell_name,
{ "Network Name", "turbocell.name",
FT_STRINGZ, BASE_NONE, NULL, 0,
NULL, HFILL }
},
{ &hf_turbocell_station,
{ "Station", "turbocell.station",
FT_ETHER, BASE_NONE, NULL, 0,
"connected stations / satellites ?", HFILL },
}
};
static hf_register_info aggregate_fields[] = {
{ &hf_turbocell_aggregate_msdu_header_text,
{"MAC Service Data Unit (MSDU)", "turbocell_aggregate.msduheader",
FT_UINT16, BASE_DEC, 0, 0x0, NULL, HFILL }
},
{ &hf_turbocell_aggregate_msdu_len,
{"MSDU length", "turbocell_aggregate.msdulen",
FT_UINT16, BASE_DEC_HEX, 0, 0x0FFF, NULL, HFILL }
},
{ &hf_turbocell_aggregate_len,
{ "Total Length", "turbocell_aggregate.len",
FT_UINT16, BASE_DEC_HEX, NULL, 0,
"Total reported length", HFILL }
},
{ &hf_turbocell_aggregate_unknown1,
{ "Unknown", "turbocell_aggregate.unknown1",
FT_UINT16, BASE_HEX, NULL, 0,
"Always 0x7856", HFILL }
},
{ &hf_turbocell_aggregate_unknown2,
{ "Unknown", "turbocell_aggregate.unknown2",
FT_UINT8, BASE_HEX, NULL, 0xF0,
"have the values 0x4,0xC or 0x8", HFILL }
},
};
static int *ett[] = {
&ett_turbocell,
&ett_network,
&ett_msdu_aggregation_parent_tree,
&ett_msdu_aggregation_subframe_tree
};
proto_turbocell = proto_register_protocol("Turbocell Header", "Turbocell", "turbocell");
proto_aggregate = proto_register_protocol("Turbocell Aggregate Data",
"Turbocell Aggregate Data", "turbocell_aggregate");
proto_register_field_array(proto_aggregate, aggregate_fields, array_length(aggregate_fields));
register_dissector("turbocell", dissect_turbocell, proto_turbocell);
proto_register_field_array(proto_turbocell, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
}
void proto_reg_handoff_turbocell(void)
{
eth_handle = find_dissector_add_dependency("eth_withoutfcs", proto_turbocell);
}
/*
* 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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