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/* packet-loratap.c
* Dissector routines for the LoRaTap encapsulation
* By Erik de Jong <erikdejong@gmail.com>
* Copyright 2017 Erik de Jong
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include <wiretap/wtap.h>
#include <epan/packet.h>
#include <epan/capture_dissectors.h>
void proto_reg_handoff_loratap(void);
void proto_register_loratap(void);
static dissector_handle_t loratap_handle;
static dissector_table_t loratap_dissector_table;
static int proto_loratap = -1;
static int hf_loratap_header_version_type = -1;
static int hf_loratap_header_length_type = -1;
static int hf_loratap_header_padding = -1;
static int hf_loratap_header_channel_type = -1;
static int hf_loratap_header_channel_frequency_type = -1;
static int hf_loratap_header_channel_bandwidth_type = -1;
static int hf_loratap_header_channel_sf_type = -1;
static int hf_loratap_header_rssi_type = -1;
static int hf_loratap_header_rssi_packet_type = -1;
static int hf_loratap_header_rssi_max_type = -1;
static int hf_loratap_header_rssi_current_type = -1;
static int hf_loratap_header_rssi_snr_type = -1;
static int hf_loratap_header_syncword_type = -1;
static gint ett_loratap = -1;
static const value_string channel_bandwidth[] = {
{ 1, "125 KHz" },
{ 2, "250 KHz" },
{ 4, "500 KHz" },
{ 0, NULL}
};
static const value_string syncwords[] = {
{ 0x34, "LoRaWAN" },
{ 0, NULL}
};
static void
rssi_base_custom(gchar *buffer, guint32 value) {
g_snprintf(buffer, ITEM_LABEL_LENGTH, "%.0f dBm", -139 + (float)value);
}
static void
snr_base_custom(gchar *buffer, guint32 value) {
if( value & 0x80 ) {
value = ( ( ~value + 1 ) & 0xFF ) >> 2;
} else {
value = ( value & 0xFF ) >> 2;
}
g_snprintf(buffer, ITEM_LABEL_LENGTH, "%d dB", value);
}
static int
dissect_loratap(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree _U_, void *data _U_)
{
proto_item *ti, *channel_item, *rssi_item;
proto_tree *loratap_tree, *channel_tree, *rssi_tree;
gint32 current_offset = 0;
guint16 length;
guint32 syncword;
tvbuff_t *next_tvb;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "LoRaTap");
col_clear(pinfo->cinfo,COL_INFO);
length = tvb_get_guint16(tvb, 2, ENC_BIG_ENDIAN);
ti = proto_tree_add_item(tree, proto_loratap, tvb, 0, length, ENC_NA);
loratap_tree = proto_item_add_subtree(ti, ett_loratap);
proto_tree_add_item(loratap_tree, hf_loratap_header_version_type, tvb, current_offset, 1, ENC_NA);
current_offset++;
proto_tree_add_item(loratap_tree, hf_loratap_header_padding, tvb, current_offset, 1, ENC_NA);
current_offset++;
proto_tree_add_item(loratap_tree, hf_loratap_header_length_type, tvb, current_offset, 2, ENC_NA);
current_offset += 2;
channel_item = proto_tree_add_item(loratap_tree, hf_loratap_header_channel_type, tvb, current_offset, 6, ENC_NA);
channel_tree = proto_item_add_subtree(channel_item, ett_loratap);
proto_tree_add_item(channel_tree, hf_loratap_header_channel_frequency_type, tvb, current_offset, 4, ENC_NA);
current_offset += 4;
proto_tree_add_item(channel_tree, hf_loratap_header_channel_bandwidth_type, tvb, current_offset, 1, ENC_NA);
current_offset++;
proto_tree_add_item(channel_tree, hf_loratap_header_channel_sf_type, tvb, current_offset, 1, ENC_NA);
current_offset++;
rssi_item = proto_tree_add_item(loratap_tree, hf_loratap_header_rssi_type, tvb, current_offset, 4, ENC_NA);
rssi_tree = proto_item_add_subtree(rssi_item, ett_loratap);
proto_tree_add_item(rssi_tree, hf_loratap_header_rssi_packet_type, tvb, current_offset, 1, ENC_NA);
current_offset++;
proto_tree_add_item(rssi_tree, hf_loratap_header_rssi_max_type, tvb, current_offset, 1, ENC_NA);
current_offset++;
proto_tree_add_item(rssi_tree, hf_loratap_header_rssi_current_type, tvb, current_offset, 1, ENC_NA);
current_offset++;
proto_tree_add_item(rssi_tree, hf_loratap_header_rssi_snr_type, tvb, current_offset, 1, ENC_NA);
current_offset++;
proto_tree_add_item_ret_uint(loratap_tree, hf_loratap_header_syncword_type, tvb, current_offset, 1, ENC_NA, &syncword);
current_offset++;
next_tvb = tvb_new_subset_length_caplen(tvb, current_offset, tvb_captured_length_remaining(tvb, current_offset), tvb_reported_length_remaining(tvb, current_offset));
if (!dissector_try_uint_new(loratap_dissector_table, syncword, next_tvb, pinfo, tree, TRUE, NULL)) {
call_data_dissector(next_tvb, pinfo, tree);
}
return tvb_captured_length(tvb);
}
void
proto_reg_handoff_loratap(void)
{
dissector_add_uint("wtap_encap", WTAP_ENCAP_LORATAP, loratap_handle);
}
void
proto_register_loratap(void)
{
static hf_register_info hf[] = {
{ &hf_loratap_header_version_type,
{ "Header Version", "loratap.version",
FT_UINT8, BASE_DEC,
NULL, 0x0,
NULL, HFILL }
},
{ &hf_loratap_header_length_type,
{ "Header Length", "loratap.header_length",
FT_UINT16, BASE_DEC,
NULL, 0x0,
NULL, HFILL }
},
{ &hf_loratap_header_padding,
{ "Padding", "loratap.padding",
FT_BYTES, BASE_NONE,
NULL, 0x0,
NULL, HFILL }
},
{ &hf_loratap_header_channel_type,
{ "Channel", "loratap.channel",
FT_NONE, BASE_NONE,
NULL, 0x0,
NULL, HFILL }
},
{ &hf_loratap_header_channel_frequency_type,
{ "Frequency", "loratap.channel.frequency",
FT_UINT32, BASE_DEC|BASE_UNIT_STRING,
&units_hz, 0x0,
NULL, HFILL }
},
{ &hf_loratap_header_channel_bandwidth_type,
{ "Bandwidth", "loratap.channel.bandwidth",
FT_UINT8, BASE_DEC,
VALS(channel_bandwidth), 0x0,
NULL, HFILL }
},
{ &hf_loratap_header_channel_sf_type,
{ "Spreading Factor", "loratap.channel.sf",
FT_UINT8, BASE_DEC,
NULL, 0x0,
NULL, HFILL }
},
{ &hf_loratap_header_rssi_type,
{ "RSSI", "loratap.rssi",
FT_NONE, BASE_NONE,
NULL, 0x0,
NULL, HFILL }
},
{ &hf_loratap_header_rssi_packet_type,
{ "Packet", "loratap.rssi.packet",
FT_UINT8, BASE_CUSTOM,
CF_FUNC(rssi_base_custom), 0x0,
NULL, HFILL }
},
{ &hf_loratap_header_rssi_max_type,
{ "Max", "loratap.rssi.max",
FT_UINT8, BASE_CUSTOM,
CF_FUNC(rssi_base_custom), 0x0,
NULL, HFILL }
},
{ &hf_loratap_header_rssi_current_type,
{ "Current", "loratap.rssi.current",
FT_UINT8, BASE_CUSTOM,
CF_FUNC(rssi_base_custom), 0x0,
NULL, HFILL }
},
{ &hf_loratap_header_rssi_snr_type,
{ "SNR", "loratap.rssi.snr",
FT_UINT8, BASE_CUSTOM,
CF_FUNC(snr_base_custom), 0x0,
NULL, HFILL }
},
{ &hf_loratap_header_syncword_type,
{ "Sync Word", "loratap.syncword",
FT_UINT8, BASE_HEX,
VALS(syncwords), 0x0,
NULL, HFILL }
},
};
/* Setup protocol subtree array */
static gint *ett[] = {
&ett_loratap
};
proto_loratap = proto_register_protocol (
"LoRaTap header", /* name */
"LoRaTap", /* short name */
"loratap" /* abbrev */
);
loratap_handle = register_dissector("loratap", dissect_loratap, proto_loratap);
proto_register_field_array(proto_loratap, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
loratap_dissector_table = register_dissector_table("loratap.syncword", "LoRa Syncword", proto_loratap, FT_UINT8, BASE_HEX);
}
/*
* Editor modelines - http://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:
*/
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