345 lines
14 KiB
C
345 lines
14 KiB
C
/* isi-gps.c
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* Dissector for ISI's GPS resource
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* Copyright 2010, Sebastian Reichel <sre@ring0.de>
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* GPS Data Packet Reverse Engineered by Luke Dashjr <luke@dashjr.org>
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <glib.h>
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#include <epan/prefs.h>
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#include <epan/packet.h>
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#include "packet-isi.h"
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#include "isi-gps.h"
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/* centimeter per second to kilometer per hour */
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#define CMS_TO_KMH 0.036
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#define SAT_PKG_LEN 12
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static const value_string isi_gps_id[] = {
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//{0x0d, "GPS_UNKNOWN_0D"},
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//{0x0e, "GPS_UNKNOWN_0E"},
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{0x7d, "GPS_STATUS_IND"},
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//{0x7e, "GPS_UNKNOWN_7E"},
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//{0x7f, "GPS_UNKNOWN_7F"},
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//{0x82, "GPS_UNKNOWN_82"},
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//{0x83, "GPS_UNKNOWN_83"},
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//{0x84, "GPS_UNKNOWN_84"},
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//{0x85, "GPS_UNKNOWN_85"},
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//{0x90, "GPS_UNKNOWN_90"},
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//{0x91, "GPS_UNKNOWN_91"},
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{0x90, "GPS_POWER_STATUS_REQ"},
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{0x91, "GPS_POWER_STATUS_RSP"},
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{0x92, "GPS_DATA_IND"},
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{0x00, NULL }
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};
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static const value_string isi_gps_sub_id[] = {
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{0x02, "GPS_POSITION"},
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{0x03, "GPS_TIME_DATE"},
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{0x04, "GPS_MOVEMENT"},
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{0x05, "GPS_SAT_INFO"},
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{0x07, "GPS_CELL_INFO_GSM"},
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{0x08, "GPS_CELL_INFO_WCDMA"},
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{0x00, NULL }
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};
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static const value_string isi_gps_status[] = {
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{0x00, "GPS_DISABLED"},
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{0x01, "GPS_NO_LOCK"},
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{0x02, "GPS_LOCK"},
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{0x00, NULL }
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};
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static dissector_handle_t isi_gps_handle;
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static void dissect_isi_gps(tvbuff_t *tvb, packet_info *pinfo, proto_item *tree);
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static guint32 hf_isi_gps_cmd = -1;
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static guint32 hf_isi_gps_sub_pkgs = -1;
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static guint32 hf_isi_gps_sub_type = -1;
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static guint32 hf_isi_gps_sub_len = -1;
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static guint32 hf_isi_gps_status = -1;
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static guint32 hf_isi_gps_year = -1;
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static guint32 hf_isi_gps_month = -1;
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static guint32 hf_isi_gps_day = -1;
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static guint32 hf_isi_gps_hour = -1;
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static guint32 hf_isi_gps_minute = -1;
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static guint32 hf_isi_gps_second = -1;
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static guint32 hf_isi_gps_latitude = -1;
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static guint32 hf_isi_gps_longitude = -1;
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static guint32 hf_isi_gps_eph = -1;
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static guint32 hf_isi_gps_altitude = -1;
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static guint32 hf_isi_gps_epv = -1;
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static guint32 hf_isi_gps_course = -1;
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static guint32 hf_isi_gps_epd = -1;
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static guint32 hf_isi_gps_speed = -1;
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static guint32 hf_isi_gps_eps = -1;
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static guint32 hf_isi_gps_climb = -1;
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static guint32 hf_isi_gps_epc = -1;
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static guint32 hf_isi_gps_mcc = -1;
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static guint32 hf_isi_gps_mnc = -1;
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static guint32 hf_isi_gps_lac = -1;
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static guint32 hf_isi_gps_cid = -1;
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static guint32 hf_isi_gps_ucid = -1;
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static guint32 hf_isi_gps_satellites = -1;
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static guint32 hf_isi_gps_prn = -1;
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static guint32 hf_isi_gps_sat_used = -1;
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static guint32 hf_isi_gps_sat_strength = -1;
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static guint32 hf_isi_gps_sat_elevation = -1;
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static guint32 hf_isi_gps_sat_azimuth = -1;
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void proto_reg_handoff_isi_gps(void) {
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static gboolean initialized=FALSE;
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if (!initialized) {
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isi_gps_handle = create_dissector_handle(dissect_isi_gps, proto_isi);
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dissector_add("isi.resource", 0x54, isi_gps_handle);
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}
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}
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void proto_register_isi_gps(void) {
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static hf_register_info hf[] = {
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{ &hf_isi_gps_cmd,
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{ "Command", "isi.gps.cmd", FT_UINT8, BASE_HEX, isi_gps_id, 0x0, "Command", HFILL }},
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{ &hf_isi_gps_sub_pkgs,
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{ "Number of Subpackets", "isi.gps.pkgs", FT_UINT8, BASE_DEC, NULL, 0x0, "Number of Subpackets", HFILL }},
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{ &hf_isi_gps_sub_type,
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{ "Subpacket Type", "isi.gps.sub.type", FT_UINT8, BASE_HEX, isi_gps_sub_id, 0x0, "Subpacket Type", HFILL }},
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{ &hf_isi_gps_sub_len,
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{ "Subpacket Length", "isi.gps.sub.len", FT_UINT8, BASE_DEC, NULL, 0x0, "Subpacket Length", HFILL }},
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{ &hf_isi_gps_status,
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{ "Status", "isi.gps.status", FT_UINT8, BASE_HEX, isi_gps_status, 0x0, "Status", HFILL }},
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{ &hf_isi_gps_year,
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{ "Year", "isi.gps.date.year", FT_UINT16, BASE_DEC, NULL, 0x0, "Year", HFILL }},
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{ &hf_isi_gps_month,
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{ "Month", "isi.gps.date.month", FT_UINT8, BASE_DEC, NULL, 0x0, "Month", HFILL }},
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{ &hf_isi_gps_day,
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{ "Day", "isi.gps.date.day", FT_UINT8, BASE_DEC, NULL, 0x0, "Day", HFILL }},
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{ &hf_isi_gps_hour,
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{ "Hour", "isi.gps.time.hour", FT_UINT8, BASE_DEC, NULL, 0x0, "Hour", HFILL }},
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{ &hf_isi_gps_minute,
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{ "Minute", "isi.gps.time.minute", FT_UINT8, BASE_DEC, NULL, 0x0, "Minute", HFILL }},
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{ &hf_isi_gps_second,
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{ "Second", "isi.gps.time.second", FT_FLOAT, BASE_NONE, NULL, 0x0, "Second", HFILL }},
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{ &hf_isi_gps_latitude,
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{ "Latitude", "isi.gps.lat", FT_DOUBLE, BASE_NONE, NULL, 0x0, "Latitude", HFILL }},
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{ &hf_isi_gps_longitude,
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{ "Longitude", "isi.gps.lon", FT_DOUBLE, BASE_NONE, NULL, 0x0, "Longitude", HFILL }},
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{ &hf_isi_gps_eph,
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{ "Position Accuracy", "isi.gps.eph", FT_FLOAT, BASE_NONE, NULL, 0x0, "EPH (position accuracy) in meter", HFILL }},
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{ &hf_isi_gps_altitude,
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{ "Altitude", "isi.gps.alt", FT_INT16, BASE_DEC, NULL, 0x0, "Altitude in meter", HFILL }},
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{ &hf_isi_gps_epv,
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{ "Altitude Accuracy", "isi.gps.epv", FT_FLOAT, BASE_NONE, NULL, 0x0, "EPV (altitude accuracy) in meter", HFILL }},
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{ &hf_isi_gps_course,
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{ "Course", "isi.gps.course", FT_FLOAT, BASE_NONE, NULL, 0x0, "Course in degree", HFILL }},
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{ &hf_isi_gps_epd,
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{ "Course Accuracy", "isi.gps.epd", FT_FLOAT, BASE_NONE, NULL, 0x0, "EPD (course accuracy) in degree", HFILL }},
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{ &hf_isi_gps_speed,
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{ "Speed", "isi.gps.speed", FT_FLOAT, BASE_NONE, NULL, 0x0, "Speed in km/h", HFILL }},
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{ &hf_isi_gps_eps,
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{ "Speed Accuracy", "isi.gps.eps", FT_FLOAT, BASE_NONE, NULL, 0x0, "EPS (speed accuracy) in km/h", HFILL }},
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{ &hf_isi_gps_climb,
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{ "Climb", "isi.gps.climb", FT_FLOAT, BASE_NONE, NULL, 0x0, "Climb in km/h", HFILL }},
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{ &hf_isi_gps_satellites,
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{ "Visible Satellites", "isi.gps.satellites", FT_UINT8, BASE_DEC, NULL, 0x0, "Visible Satellites", HFILL }},
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{ &hf_isi_gps_prn,
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{ "Pseudeorandom Noise (PRN)", "isi.gps.sat.prn", FT_UINT8, BASE_HEX_DEC, NULL, 0x0, "Pseudeorandom Noise (PRN)", HFILL }},
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{ &hf_isi_gps_sat_used,
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{ "in use", "isi.gps.sat.used", FT_BOOLEAN, BASE_NONE, NULL, 0x0, "in use", HFILL }},
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{ &hf_isi_gps_sat_strength,
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{ "Signal Strength", "isi.gps.sat.strength", FT_FLOAT, BASE_NONE, NULL, 0x0, "Signal Strength", HFILL }},
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{ &hf_isi_gps_sat_elevation,
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{ "Elevation", "isi.gps.sat.elevation", FT_FLOAT, BASE_NONE, NULL, 0x0, "Elevation", HFILL }},
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{ &hf_isi_gps_sat_azimuth,
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{ "Azimuth", "isi.gps.sat.azimuth", FT_FLOAT, BASE_NONE, NULL, 0x0, "Azimuth", HFILL }},
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{ &hf_isi_gps_epc,
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{ "Climb Accuracy", "isi.gps.epc", FT_FLOAT, BASE_NONE, NULL, 0x0, "EPC (climb accuracy) in km/h", HFILL }},
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{ &hf_isi_gps_mcc,
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{ "Mobile Country Code (MCC)", "isi.gps.gsm.mcc", FT_UINT16, BASE_HEX_DEC, NULL, 0x0, "Mobile Country Code (MCC)", HFILL }},
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{ &hf_isi_gps_mnc,
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{ "Mobile Network Code (MNC)", "isi.gps.gsm.mnc", FT_UINT16, BASE_HEX_DEC, NULL, 0x0, "Mobile Network Code (MNC)", HFILL }},
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{ &hf_isi_gps_lac,
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{ "Location Area Code (LAC)", "isi.gps.gsm.lac", FT_UINT16, BASE_HEX_DEC, NULL, 0x0, "Location Area Code (LAC)", HFILL }},
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{ &hf_isi_gps_cid,
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{ "Cell ID (CID)", "isi.gps.gsm.cid", FT_UINT16, BASE_HEX_DEC, NULL, 0x0, "Cell ID (CID)", HFILL }},
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{ &hf_isi_gps_ucid,
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{ "Cell ID (UCID)", "isi.gps.gsm.ucid", FT_UINT32, BASE_HEX_DEC, NULL, 0x0, "Cell ID (UCID)", HFILL }}
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};
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proto_register_field_array(proto_isi, hf, array_length(hf));
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register_dissector("isi.gps", dissect_isi_gps, proto_isi);
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}
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static void dissect_isi_gps_data(tvbuff_t *tvb, packet_info *pinfo, proto_item *item, proto_tree *tree) {
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guint8 len = tvb->length;
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int i;
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guint8 pkgcount = tvb_get_guint8(tvb, 0x07);
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proto_tree_add_item(tree, hf_isi_gps_sub_pkgs, tvb, 0x07, 1, FALSE);
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size_t offset = 0x0b; // subpackets start here
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for(i=0; i<pkgcount; i++) {
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guint8 sptype = tvb_get_guint8(tvb, offset+1);
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guint8 splen = tvb_get_guint8(tvb, offset+3);
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proto_item *subitem = proto_tree_add_text(tree, tvb, offset, splen, "Subpacket (%s)", val_to_str(sptype, isi_gps_sub_id, "unknown: 0x%x"));
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proto_tree *subtree = proto_item_add_subtree(subitem, ett_isi_msg);
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proto_tree_add_item(subtree, hf_isi_gps_sub_type, tvb, offset+1, 1, FALSE);
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proto_tree_add_item(subtree, hf_isi_gps_sub_len, tvb, offset+3, 1, FALSE);
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offset += 4;
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switch(sptype) {
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case 0x02: ; // Position
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double lat = tvb_get_ntohl(tvb, offset+0);
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lat = (lat*360)/4294967296;
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if(lat > 180.0) lat -= 360.0;
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proto_tree_add_double(subtree, hf_isi_gps_latitude, tvb, offset+0, 4, lat);
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double lon = tvb_get_ntohl(tvb, offset+4);
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lon = (lon*360)/4294967296;
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if(lon > 180.0) lon -= 360.0;
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proto_tree_add_double(subtree, hf_isi_gps_longitude, tvb, offset+4, 4, lon);
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float eph = tvb_get_ntohl(tvb, offset+12) / 100.0;
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proto_tree_add_float(subtree, hf_isi_gps_eph, tvb, offset+12, 4, eph);
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gint32 altitude = (tvb_get_ntohs(tvb, offset+18) - tvb_get_ntohs(tvb, offset+22))/2;
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proto_tree_add_int(subtree, hf_isi_gps_altitude, tvb, offset+18, 6, altitude);
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float epv = tvb_get_ntohs(tvb, offset+20) / 2;
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proto_tree_add_float(subtree, hf_isi_gps_epv, tvb, offset+20, 2, epv);
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break;
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case 0x03: // Date and Time
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proto_tree_add_item(subtree, hf_isi_gps_year, tvb, offset+0, 2, FALSE);
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proto_tree_add_item(subtree, hf_isi_gps_month, tvb, offset+2, 1, FALSE);
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proto_tree_add_item(subtree, hf_isi_gps_day, tvb, offset+3, 1, FALSE);
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proto_tree_add_item(subtree, hf_isi_gps_hour, tvb, offset+5, 1, FALSE);
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proto_tree_add_item(subtree, hf_isi_gps_minute, tvb, offset+6, 1, FALSE);
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float second = tvb_get_ntohs(tvb, offset+8) / 1000.0;
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proto_tree_add_float(subtree, hf_isi_gps_second, tvb, offset+8, 2, second);
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break;
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case 0x04: ; // Movement
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float course = tvb_get_ntohs(tvb, offset+0) / 100.0;
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proto_tree_add_float(subtree, hf_isi_gps_course, tvb, offset+0, 2, course);
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float epd = tvb_get_ntohs(tvb, offset+2) / 100.0;
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proto_tree_add_float(subtree, hf_isi_gps_epd, tvb, offset+2, 2, epd);
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float speed = tvb_get_ntohs(tvb, offset+6) * CMS_TO_KMH;
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proto_tree_add_float(subtree, hf_isi_gps_speed, tvb, offset+6, 2, speed);
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float eps = tvb_get_ntohs(tvb, offset+8) * CMS_TO_KMH;
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proto_tree_add_float(subtree, hf_isi_gps_eps, tvb, offset+8, 2, eps);
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float climb = tvb_get_ntohs(tvb, offset+10) * CMS_TO_KMH;
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proto_tree_add_float(subtree, hf_isi_gps_climb, tvb, offset+10, 2, climb);
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float epc = tvb_get_ntohs(tvb, offset+12) * CMS_TO_KMH;
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proto_tree_add_float(subtree, hf_isi_gps_epc, tvb, offset+12, 2, epc);
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break;
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case 0x05: ; // Satellite Info
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guint8 satellites = tvb_get_guint8(tvb, offset+0);
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proto_tree_add_item(subtree, hf_isi_gps_satellites, tvb, offset+0, 1, FALSE);
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int sat;
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for(sat = 0; sat < satellites ; sat++) {
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int pos = offset+4+(sat*SAT_PKG_LEN);
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proto_item *satitem = proto_tree_add_text(subtree, tvb, pos, SAT_PKG_LEN, "Satellite %d", sat);
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proto_tree *sattree = proto_item_add_subtree(satitem, ett_isi_msg);
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float signal_strength = tvb_get_ntohs(tvb, pos+3) / 100.0;
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float elevation = tvb_get_ntohs(tvb, pos+6) / 100.0;
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float azimuth = tvb_get_ntohs(tvb, pos+8) / 100.0;
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proto_tree_add_item(sattree, hf_isi_gps_prn, tvb, pos+1, 1, FALSE);
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proto_tree_add_item(sattree, hf_isi_gps_sat_used, tvb, pos+2, 1, FALSE);
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proto_tree_add_float(sattree, hf_isi_gps_sat_strength, tvb, pos+3, 2, signal_strength);
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proto_tree_add_float(sattree, hf_isi_gps_sat_elevation, tvb, pos+6, 2, elevation);
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proto_tree_add_float(sattree, hf_isi_gps_sat_azimuth, tvb, pos+8, 2, azimuth);
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}
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break;
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case 0x07: // CellInfo GSM
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proto_tree_add_item(subtree, hf_isi_gps_mcc, tvb, offset+0, 2, FALSE);
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proto_tree_add_item(subtree, hf_isi_gps_mnc, tvb, offset+2, 2, FALSE);
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proto_tree_add_item(subtree, hf_isi_gps_lac, tvb, offset+4, 2, FALSE);
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proto_tree_add_item(subtree, hf_isi_gps_cid, tvb, offset+6, 2, FALSE);
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break;
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case 0x08: // CellInfo WCDMA
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proto_tree_add_item(subtree, hf_isi_gps_mcc, tvb, offset+0, 2, FALSE);
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proto_tree_add_item(subtree, hf_isi_gps_mnc, tvb, offset+2, 2, FALSE);
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proto_tree_add_item(subtree, hf_isi_gps_ucid, tvb, offset+4, 4, FALSE);
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break;
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default:
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break;
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}
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offset += splen - 4;
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}
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}
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static void dissect_isi_gps(tvbuff_t *tvb, packet_info *pinfo, proto_item *isitree) {
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proto_item *item = NULL;
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proto_tree *tree = NULL;
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guint8 cmd;
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if(isitree) {
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item = proto_tree_add_text(isitree, tvb, 0, -1, "Payload");
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tree = proto_item_add_subtree(item, ett_isi_msg);
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proto_tree_add_item(tree, hf_isi_gps_cmd, tvb, 0, 1, FALSE);
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cmd = tvb_get_guint8(tvb, 0);
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switch(cmd) {
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case 0x7d: /* GPS Status */
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proto_tree_add_item(tree, hf_isi_gps_status, tvb, 2, 1, FALSE);
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guint8 status = tvb_get_guint8(tvb, 2);
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col_add_fstr(pinfo->cinfo, COL_INFO, "GPS Status Indication: %s", val_to_str(status, isi_gps_status, "unknown (0x%x)"));
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break;
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case 0x84:
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case 0x85:
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case 0x86:
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case 0x87:
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case 0x88:
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case 0x89:
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case 0x8a:
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case 0x8b:
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col_add_fstr(pinfo->cinfo, COL_INFO, "unknown A-GPS package (0x%02x)", cmd);
|
|
break;
|
|
case 0x90: /* GPS Power Request */
|
|
col_set_str(pinfo->cinfo, COL_INFO, "GPS Power Request");
|
|
break;
|
|
case 0x91: /* GPS Power Request */
|
|
col_set_str(pinfo->cinfo, COL_INFO, "GPS Power Response");
|
|
break;
|
|
case 0x92: /* GPS Data */
|
|
col_set_str(pinfo->cinfo, COL_INFO, "GPS Data");
|
|
dissect_isi_gps_data(tvb, pinfo, item, tree);
|
|
break;
|
|
default:
|
|
col_add_fstr(pinfo->cinfo, COL_INFO, "unknown GPS package (0x%02x)", cmd);
|
|
break;
|
|
}
|
|
}
|
|
}
|