260 lines
8.1 KiB
C
260 lines
8.1 KiB
C
/* packet-loratap.c
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* Dissector routines for the LoRaTap encapsulation
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* By Erik de Jong <erikdejong@gmail.com>
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* Copyright 2017 Erik de Jong
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "config.h"
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#include <wiretap/wtap.h>
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#include <epan/packet.h>
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#include <epan/capture_dissectors.h>
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#include <epan/decode_as.h>
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#include <epan/proto_data.h>
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void proto_reg_handoff_loratap(void);
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void proto_register_loratap(void);
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static dissector_handle_t loratap_handle;
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static dissector_table_t loratap_dissector_table;
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static int proto_loratap = -1;
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static int hf_loratap_header_version_type = -1;
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static int hf_loratap_header_length_type = -1;
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static int hf_loratap_header_padding = -1;
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static int hf_loratap_header_channel_type = -1;
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static int hf_loratap_header_channel_frequency_type = -1;
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static int hf_loratap_header_channel_bandwidth_type = -1;
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static int hf_loratap_header_channel_sf_type = -1;
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static int hf_loratap_header_rssi_type = -1;
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static int hf_loratap_header_rssi_packet_type = -1;
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static int hf_loratap_header_rssi_max_type = -1;
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static int hf_loratap_header_rssi_current_type = -1;
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static int hf_loratap_header_rssi_snr_type = -1;
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static int hf_loratap_header_syncword_type = -1;
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static gint ett_loratap = -1;
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static const value_string channel_bandwidth[] = {
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{ 1, "125 KHz" },
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{ 2, "250 KHz" },
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{ 4, "500 KHz" },
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{ 0, NULL}
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};
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static const value_string syncwords[] = {
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{ 0x34, "LoRaWAN" },
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{ 0, NULL}
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};
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static void
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rssi_base_custom(gchar *buffer, guint32 value) {
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g_snprintf(buffer, ITEM_LABEL_LENGTH, "%.0f dBm", -139 + (float)value);
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}
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static void
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snr_base_custom(gchar *buffer, guint32 value) {
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if( value & 0x80 ) {
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value = ( ( ~value + 1 ) & 0xFF ) >> 2;
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} else {
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value = ( value & 0xFF ) >> 2;
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}
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g_snprintf(buffer, ITEM_LABEL_LENGTH, "%d dB", value);
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}
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static void
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loratap_prompt(packet_info *pinfo, gchar* result)
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{
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g_snprintf(result, MAX_DECODE_AS_PROMPT_LEN, "LoRaTap syncword 0x%02x as", GPOINTER_TO_UINT(p_get_proto_data(pinfo->pool, pinfo, proto_loratap, 0)));
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}
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static gpointer
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loratap_value(packet_info *pinfo)
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{
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return p_get_proto_data(pinfo->pool, pinfo, proto_loratap, 0);
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}
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static int
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dissect_loratap(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree _U_, void *data _U_)
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{
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proto_item *ti, *channel_item, *rssi_item;
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proto_tree *loratap_tree, *channel_tree, *rssi_tree;
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gint32 current_offset = 0;
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guint16 length;
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guint32 syncword;
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tvbuff_t *next_tvb;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "LoRaTap");
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col_clear(pinfo->cinfo,COL_INFO);
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length = tvb_get_guint16(tvb, 2, ENC_BIG_ENDIAN);
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ti = proto_tree_add_item(tree, proto_loratap, tvb, 0, length, ENC_NA);
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loratap_tree = proto_item_add_subtree(ti, ett_loratap);
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proto_tree_add_item(loratap_tree, hf_loratap_header_version_type, tvb, current_offset, 1, ENC_NA);
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current_offset++;
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proto_tree_add_item(loratap_tree, hf_loratap_header_padding, tvb, current_offset, 1, ENC_NA);
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current_offset++;
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proto_tree_add_item(loratap_tree, hf_loratap_header_length_type, tvb, current_offset, 2, ENC_NA);
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current_offset += 2;
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channel_item = proto_tree_add_item(loratap_tree, hf_loratap_header_channel_type, tvb, current_offset, 6, ENC_NA);
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channel_tree = proto_item_add_subtree(channel_item, ett_loratap);
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proto_tree_add_item(channel_tree, hf_loratap_header_channel_frequency_type, tvb, current_offset, 4, ENC_NA);
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current_offset += 4;
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proto_tree_add_item(channel_tree, hf_loratap_header_channel_bandwidth_type, tvb, current_offset, 1, ENC_NA);
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current_offset++;
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proto_tree_add_item(channel_tree, hf_loratap_header_channel_sf_type, tvb, current_offset, 1, ENC_NA);
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current_offset++;
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rssi_item = proto_tree_add_item(loratap_tree, hf_loratap_header_rssi_type, tvb, current_offset, 4, ENC_NA);
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rssi_tree = proto_item_add_subtree(rssi_item, ett_loratap);
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proto_tree_add_item(rssi_tree, hf_loratap_header_rssi_packet_type, tvb, current_offset, 1, ENC_NA);
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current_offset++;
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proto_tree_add_item(rssi_tree, hf_loratap_header_rssi_max_type, tvb, current_offset, 1, ENC_NA);
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current_offset++;
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proto_tree_add_item(rssi_tree, hf_loratap_header_rssi_current_type, tvb, current_offset, 1, ENC_NA);
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current_offset++;
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proto_tree_add_item(rssi_tree, hf_loratap_header_rssi_snr_type, tvb, current_offset, 1, ENC_NA);
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current_offset++;
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proto_tree_add_item_ret_uint(loratap_tree, hf_loratap_header_syncword_type, tvb, current_offset, 1, ENC_NA, &syncword);
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current_offset++;
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p_add_proto_data(pinfo->pool, pinfo, proto_loratap, 0, GUINT_TO_POINTER((guint)syncword));
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next_tvb = tvb_new_subset_length_caplen(tvb, current_offset, tvb_captured_length_remaining(tvb, current_offset), tvb_reported_length_remaining(tvb, current_offset));
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if (!dissector_try_uint_new(loratap_dissector_table, syncword, next_tvb, pinfo, tree, TRUE, NULL)) {
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call_data_dissector(next_tvb, pinfo, tree);
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}
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return tvb_captured_length(tvb);
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}
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void
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proto_reg_handoff_loratap(void)
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{
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dissector_add_uint("wtap_encap", WTAP_ENCAP_LORATAP, loratap_handle);
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dissector_add_for_decode_as("udp.port", loratap_handle);
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}
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void
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proto_register_loratap(void)
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{
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static hf_register_info hf[] = {
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{ &hf_loratap_header_version_type,
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{ "Header Version", "loratap.version",
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FT_UINT8, BASE_DEC,
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NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_loratap_header_length_type,
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{ "Header Length", "loratap.header_length",
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FT_UINT16, BASE_DEC,
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NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_loratap_header_padding,
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{ "Padding", "loratap.padding",
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FT_BYTES, BASE_NONE,
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NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_loratap_header_channel_type,
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{ "Channel", "loratap.channel",
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FT_NONE, BASE_NONE,
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NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_loratap_header_channel_frequency_type,
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{ "Frequency", "loratap.channel.frequency",
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FT_UINT32, BASE_DEC|BASE_UNIT_STRING,
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&units_hz, 0x0,
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NULL, HFILL }
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},
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{ &hf_loratap_header_channel_bandwidth_type,
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{ "Bandwidth", "loratap.channel.bandwidth",
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FT_UINT8, BASE_DEC,
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VALS(channel_bandwidth), 0x0,
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NULL, HFILL }
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},
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{ &hf_loratap_header_channel_sf_type,
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{ "Spreading Factor", "loratap.channel.sf",
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FT_UINT8, BASE_DEC,
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NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_loratap_header_rssi_type,
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{ "RSSI", "loratap.rssi",
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FT_NONE, BASE_NONE,
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NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_loratap_header_rssi_packet_type,
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{ "Packet", "loratap.rssi.packet",
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FT_UINT8, BASE_CUSTOM,
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CF_FUNC(rssi_base_custom), 0x0,
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NULL, HFILL }
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},
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{ &hf_loratap_header_rssi_max_type,
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{ "Max", "loratap.rssi.max",
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FT_UINT8, BASE_CUSTOM,
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CF_FUNC(rssi_base_custom), 0x0,
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NULL, HFILL }
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},
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{ &hf_loratap_header_rssi_current_type,
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{ "Current", "loratap.rssi.current",
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FT_UINT8, BASE_CUSTOM,
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CF_FUNC(rssi_base_custom), 0x0,
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NULL, HFILL }
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},
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{ &hf_loratap_header_rssi_snr_type,
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{ "SNR", "loratap.rssi.snr",
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FT_UINT8, BASE_CUSTOM,
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CF_FUNC(snr_base_custom), 0x0,
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NULL, HFILL }
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},
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{ &hf_loratap_header_syncword_type,
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{ "Sync Word", "loratap.syncword",
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FT_UINT8, BASE_HEX,
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VALS(syncwords), 0x0,
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NULL, HFILL }
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},
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};
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/* Register for decode as */
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static build_valid_func loratap_da_build_value[1] = {loratap_value};
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static decode_as_value_t loratap_da_values = {loratap_prompt, 1, loratap_da_build_value};
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static decode_as_t loratap_da = {"loratap", "loratap.syncword", 1, 0, &loratap_da_values, NULL, NULL, decode_as_default_populate_list, decode_as_default_reset, decode_as_default_change, NULL};
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/* Setup protocol subtree array */
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static gint *ett[] = {
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&ett_loratap
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};
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proto_loratap = proto_register_protocol (
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"LoRaTap header", /* name */
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"LoRaTap", /* short name */
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"loratap" /* abbrev */
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);
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loratap_handle = register_dissector("loratap", dissect_loratap, proto_loratap);
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proto_register_field_array(proto_loratap, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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loratap_dissector_table = register_dissector_table("loratap.syncword", "LoRa Syncword", proto_loratap, FT_UINT8, BASE_HEX);
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register_decode_as(&loratap_da);
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}
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/*
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* Editor modelines - https://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 8
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* tab-width: 8
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* indent-tabs-mode: t
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* End:
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*
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* vi: set shiftwidth=8 tabstop=8 noexpandtab:
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* :indentSize=8:tabSize=8:noTabs=false:
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*/
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