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/* isi-gps.c
* Dissector for ISI's GPS resource
* Copyright 2010, Sebastian Reichel <sre@ring0.de>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* GPS Data Packet Reverse Engineered by Luke Dashjr <luke@dashjr.org>
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <glib.h>
#include <epan/prefs.h>
#include <epan/packet.h>
#include "packet-isi.h"
#include "isi-gps.h"
/* centimeter per second to kilometer per hour */
#define CMS_TO_KMH 0.036
#define SAT_PKG_LEN 12
static const value_string isi_gps_id[] = {
//{0x0d, "GPS_UNKNOWN_0D"},
//{0x0e, "GPS_UNKNOWN_0E"},
{0x7d, "GPS_STATUS_IND"},
//{0x7e, "GPS_UNKNOWN_7E"},
//{0x7f, "GPS_UNKNOWN_7F"},
//{0x82, "GPS_UNKNOWN_82"},
//{0x83, "GPS_UNKNOWN_83"},
//{0x84, "GPS_UNKNOWN_84"},
//{0x85, "GPS_UNKNOWN_85"},
//{0x90, "GPS_UNKNOWN_90"},
//{0x91, "GPS_UNKNOWN_91"},
{0x90, "GPS_POWER_STATUS_REQ"},
{0x91, "GPS_POWER_STATUS_RSP"},
{0x92, "GPS_DATA_IND"},
{0x00, NULL }
};
static const value_string isi_gps_sub_id[] = {
{0x02, "GPS_POSITION"},
{0x03, "GPS_TIME_DATE"},
{0x04, "GPS_MOVEMENT"},
{0x05, "GPS_SAT_INFO"},
{0x07, "GPS_CELL_INFO_GSM"},
{0x08, "GPS_CELL_INFO_WCDMA"},
{0x00, NULL }
};
static const value_string isi_gps_status[] = {
{0x00, "GPS_DISABLED"},
{0x01, "GPS_NO_LOCK"},
{0x02, "GPS_LOCK"},
{0x00, NULL }
};
static dissector_handle_t isi_gps_handle;
static void dissect_isi_gps(tvbuff_t *tvb, packet_info *pinfo, proto_item *tree);
static guint32 hf_isi_gps_cmd = -1;
static guint32 hf_isi_gps_sub_pkgs = -1;
static guint32 hf_isi_gps_sub_type = -1;
static guint32 hf_isi_gps_sub_len = -1;
static guint32 hf_isi_gps_status = -1;
static guint32 hf_isi_gps_year = -1;
static guint32 hf_isi_gps_month = -1;
static guint32 hf_isi_gps_day = -1;
static guint32 hf_isi_gps_hour = -1;
static guint32 hf_isi_gps_minute = -1;
static guint32 hf_isi_gps_second = -1;
static guint32 hf_isi_gps_latitude = -1;
static guint32 hf_isi_gps_longitude = -1;
static guint32 hf_isi_gps_eph = -1;
static guint32 hf_isi_gps_altitude = -1;
static guint32 hf_isi_gps_epv = -1;
static guint32 hf_isi_gps_course = -1;
static guint32 hf_isi_gps_epd = -1;
static guint32 hf_isi_gps_speed = -1;
static guint32 hf_isi_gps_eps = -1;
static guint32 hf_isi_gps_climb = -1;
static guint32 hf_isi_gps_epc = -1;
static guint32 hf_isi_gps_mcc = -1;
static guint32 hf_isi_gps_mnc = -1;
static guint32 hf_isi_gps_lac = -1;
static guint32 hf_isi_gps_cid = -1;
static guint32 hf_isi_gps_ucid = -1;
static guint32 hf_isi_gps_satellites = -1;
static guint32 hf_isi_gps_prn = -1;
static guint32 hf_isi_gps_sat_used = -1;
static guint32 hf_isi_gps_sat_strength = -1;
static guint32 hf_isi_gps_sat_elevation = -1;
static guint32 hf_isi_gps_sat_azimuth = -1;
void proto_reg_handoff_isi_gps(void) {
static gboolean initialized=FALSE;
if (!initialized) {
isi_gps_handle = create_dissector_handle(dissect_isi_gps, proto_isi);
dissector_add("isi.resource", 0x54, isi_gps_handle);
}
}
void proto_register_isi_gps(void) {
static hf_register_info hf[] = {
{ &hf_isi_gps_cmd,
{ "Command", "isi.gps.cmd", FT_UINT8, BASE_HEX, isi_gps_id, 0x0, "Command", HFILL }},
{ &hf_isi_gps_sub_pkgs,
{ "Number of Subpackets", "isi.gps.pkgs", FT_UINT8, BASE_DEC, NULL, 0x0, "Number of Subpackets", HFILL }},
{ &hf_isi_gps_sub_type,
{ "Subpacket Type", "isi.gps.sub.type", FT_UINT8, BASE_HEX, isi_gps_sub_id, 0x0, "Subpacket Type", HFILL }},
{ &hf_isi_gps_sub_len,
{ "Subpacket Length", "isi.gps.sub.len", FT_UINT8, BASE_DEC, NULL, 0x0, "Subpacket Length", HFILL }},
{ &hf_isi_gps_status,
{ "Status", "isi.gps.status", FT_UINT8, BASE_HEX, isi_gps_status, 0x0, "Status", HFILL }},
{ &hf_isi_gps_year,
{ "Year", "isi.gps.date.year", FT_UINT16, BASE_DEC, NULL, 0x0, "Year", HFILL }},
{ &hf_isi_gps_month,
{ "Month", "isi.gps.date.month", FT_UINT8, BASE_DEC, NULL, 0x0, "Month", HFILL }},
{ &hf_isi_gps_day,
{ "Day", "isi.gps.date.day", FT_UINT8, BASE_DEC, NULL, 0x0, "Day", HFILL }},
{ &hf_isi_gps_hour,
{ "Hour", "isi.gps.time.hour", FT_UINT8, BASE_DEC, NULL, 0x0, "Hour", HFILL }},
{ &hf_isi_gps_minute,
{ "Minute", "isi.gps.time.minute", FT_UINT8, BASE_DEC, NULL, 0x0, "Minute", HFILL }},
{ &hf_isi_gps_second,
{ "Second", "isi.gps.time.second", FT_FLOAT, BASE_NONE, NULL, 0x0, "Second", HFILL }},
{ &hf_isi_gps_latitude,
{ "Latitude", "isi.gps.lat", FT_DOUBLE, BASE_NONE, NULL, 0x0, "Latitude", HFILL }},
{ &hf_isi_gps_longitude,
{ "Longitude", "isi.gps.lon", FT_DOUBLE, BASE_NONE, NULL, 0x0, "Longitude", HFILL }},
{ &hf_isi_gps_eph,
{ "Position Accuracy", "isi.gps.eph", FT_FLOAT, BASE_NONE, NULL, 0x0, "EPH (position accuracy) in meter", HFILL }},
{ &hf_isi_gps_altitude,
{ "Altitude", "isi.gps.alt", FT_INT16, BASE_DEC, NULL, 0x0, "Altitude in meter", HFILL }},
{ &hf_isi_gps_epv,
{ "Altitude Accuracy", "isi.gps.epv", FT_FLOAT, BASE_NONE, NULL, 0x0, "EPV (altitude accuracy) in meter", HFILL }},
{ &hf_isi_gps_course,
{ "Course", "isi.gps.course", FT_FLOAT, BASE_NONE, NULL, 0x0, "Course in degree", HFILL }},
{ &hf_isi_gps_epd,
{ "Course Accuracy", "isi.gps.epd", FT_FLOAT, BASE_NONE, NULL, 0x0, "EPD (course accuracy) in degree", HFILL }},
{ &hf_isi_gps_speed,
{ "Speed", "isi.gps.speed", FT_FLOAT, BASE_NONE, NULL, 0x0, "Speed in km/h", HFILL }},
{ &hf_isi_gps_eps,
{ "Speed Accuracy", "isi.gps.eps", FT_FLOAT, BASE_NONE, NULL, 0x0, "EPS (speed accuracy) in km/h", HFILL }},
{ &hf_isi_gps_climb,
{ "Climb", "isi.gps.climb", FT_FLOAT, BASE_NONE, NULL, 0x0, "Climb in km/h", HFILL }},
{ &hf_isi_gps_satellites,
{ "Visible Satellites", "isi.gps.satellites", FT_UINT8, BASE_DEC, NULL, 0x0, "Visible Satellites", HFILL }},
{ &hf_isi_gps_prn,
{ "Pseudeorandom Noise (PRN)", "isi.gps.sat.prn", FT_UINT8, BASE_HEX_DEC, NULL, 0x0, "Pseudeorandom Noise (PRN)", HFILL }},
{ &hf_isi_gps_sat_used,
{ "in use", "isi.gps.sat.used", FT_BOOLEAN, BASE_NONE, NULL, 0x0, "in use", HFILL }},
{ &hf_isi_gps_sat_strength,
{ "Signal Strength", "isi.gps.sat.strength", FT_FLOAT, BASE_NONE, NULL, 0x0, "Signal Strength", HFILL }},
{ &hf_isi_gps_sat_elevation,
{ "Elevation", "isi.gps.sat.elevation", FT_FLOAT, BASE_NONE, NULL, 0x0, "Elevation", HFILL }},
{ &hf_isi_gps_sat_azimuth,
{ "Azimuth", "isi.gps.sat.azimuth", FT_FLOAT, BASE_NONE, NULL, 0x0, "Azimuth", HFILL }},
{ &hf_isi_gps_epc,
{ "Climb Accuracy", "isi.gps.epc", FT_FLOAT, BASE_NONE, NULL, 0x0, "EPC (climb accuracy) in km/h", HFILL }},
{ &hf_isi_gps_mcc,
{ "Mobile Country Code (MCC)", "isi.gps.gsm.mcc", FT_UINT16, BASE_HEX_DEC, NULL, 0x0, "Mobile Country Code (MCC)", HFILL }},
{ &hf_isi_gps_mnc,
{ "Mobile Network Code (MNC)", "isi.gps.gsm.mnc", FT_UINT16, BASE_HEX_DEC, NULL, 0x0, "Mobile Network Code (MNC)", HFILL }},
{ &hf_isi_gps_lac,
{ "Location Area Code (LAC)", "isi.gps.gsm.lac", FT_UINT16, BASE_HEX_DEC, NULL, 0x0, "Location Area Code (LAC)", HFILL }},
{ &hf_isi_gps_cid,
{ "Cell ID (CID)", "isi.gps.gsm.cid", FT_UINT16, BASE_HEX_DEC, NULL, 0x0, "Cell ID (CID)", HFILL }},
{ &hf_isi_gps_ucid,
{ "Cell ID (UCID)", "isi.gps.gsm.ucid", FT_UINT32, BASE_HEX_DEC, NULL, 0x0, "Cell ID (UCID)", HFILL }}
};
proto_register_field_array(proto_isi, hf, array_length(hf));
register_dissector("isi.gps", dissect_isi_gps, proto_isi);
}
static void dissect_isi_gps_data(tvbuff_t *tvb, packet_info *pinfo, proto_item *item, proto_tree *tree) {
guint8 len = tvb->length;
int i;
guint8 pkgcount = tvb_get_guint8(tvb, 0x07);
proto_tree_add_item(tree, hf_isi_gps_sub_pkgs, tvb, 0x07, 1, FALSE);
size_t offset = 0x0b; // subpackets start here
for(i=0; i<pkgcount; i++) {
guint8 sptype = tvb_get_guint8(tvb, offset+1);
guint8 splen = tvb_get_guint8(tvb, offset+3);
proto_item *subitem = proto_tree_add_text(tree, tvb, offset, splen, "Subpacket (%s)", val_to_str(sptype, isi_gps_sub_id, "unknown: 0x%x"));
proto_tree *subtree = proto_item_add_subtree(subitem, ett_isi_msg);
proto_tree_add_item(subtree, hf_isi_gps_sub_type, tvb, offset+1, 1, FALSE);
proto_tree_add_item(subtree, hf_isi_gps_sub_len, tvb, offset+3, 1, FALSE);
offset += 4;
switch(sptype) {
case 0x02: ; // Position
double lat = tvb_get_ntohl(tvb, offset+0);
lat = (lat*360)/4294967296;
if(lat > 180.0) lat -= 360.0;
proto_tree_add_double(subtree, hf_isi_gps_latitude, tvb, offset+0, 4, lat);
double lon = tvb_get_ntohl(tvb, offset+4);
lon = (lon*360)/4294967296;
if(lon > 180.0) lon -= 360.0;
proto_tree_add_double(subtree, hf_isi_gps_longitude, tvb, offset+4, 4, lon);
float eph = tvb_get_ntohl(tvb, offset+12) / 100.0;
proto_tree_add_float(subtree, hf_isi_gps_eph, tvb, offset+12, 4, eph);
gint32 altitude = (tvb_get_ntohs(tvb, offset+18) - tvb_get_ntohs(tvb, offset+22))/2;
proto_tree_add_int(subtree, hf_isi_gps_altitude, tvb, offset+18, 6, altitude);
float epv = tvb_get_ntohs(tvb, offset+20) / 2;
proto_tree_add_float(subtree, hf_isi_gps_epv, tvb, offset+20, 2, epv);
break;
case 0x03: // Date and Time
proto_tree_add_item(subtree, hf_isi_gps_year, tvb, offset+0, 2, FALSE);
proto_tree_add_item(subtree, hf_isi_gps_month, tvb, offset+2, 1, FALSE);
proto_tree_add_item(subtree, hf_isi_gps_day, tvb, offset+3, 1, FALSE);
proto_tree_add_item(subtree, hf_isi_gps_hour, tvb, offset+5, 1, FALSE);
proto_tree_add_item(subtree, hf_isi_gps_minute, tvb, offset+6, 1, FALSE);
float second = tvb_get_ntohs(tvb, offset+8) / 1000.0;
proto_tree_add_float(subtree, hf_isi_gps_second, tvb, offset+8, 2, second);
break;
case 0x04: ; // Movement
float course = tvb_get_ntohs(tvb, offset+0) / 100.0;
proto_tree_add_float(subtree, hf_isi_gps_course, tvb, offset+0, 2, course);
float epd = tvb_get_ntohs(tvb, offset+2) / 100.0;
proto_tree_add_float(subtree, hf_isi_gps_epd, tvb, offset+2, 2, epd);
float speed = tvb_get_ntohs(tvb, offset+6) * CMS_TO_KMH;
proto_tree_add_float(subtree, hf_isi_gps_speed, tvb, offset+6, 2, speed);
float eps = tvb_get_ntohs(tvb, offset+8) * CMS_TO_KMH;
proto_tree_add_float(subtree, hf_isi_gps_eps, tvb, offset+8, 2, eps);
float climb = tvb_get_ntohs(tvb, offset+10) * CMS_TO_KMH;
proto_tree_add_float(subtree, hf_isi_gps_climb, tvb, offset+10, 2, climb);
float epc = tvb_get_ntohs(tvb, offset+12) * CMS_TO_KMH;
proto_tree_add_float(subtree, hf_isi_gps_epc, tvb, offset+12, 2, epc);
break;
case 0x05: ; // Satellite Info
guint8 satellites = tvb_get_guint8(tvb, offset+0);
proto_tree_add_item(subtree, hf_isi_gps_satellites, tvb, offset+0, 1, FALSE);
int sat;
for(sat = 0; sat < satellites ; sat++) {
int pos = offset+4+(sat*SAT_PKG_LEN);
proto_item *satitem = proto_tree_add_text(subtree, tvb, pos, SAT_PKG_LEN, "Satellite %d", sat);
proto_tree *sattree = proto_item_add_subtree(satitem, ett_isi_msg);
float signal_strength = tvb_get_ntohs(tvb, pos+3) / 100.0;
float elevation = tvb_get_ntohs(tvb, pos+6) / 100.0;
float azimuth = tvb_get_ntohs(tvb, pos+8) / 100.0;
proto_tree_add_item(sattree, hf_isi_gps_prn, tvb, pos+1, 1, FALSE);
proto_tree_add_item(sattree, hf_isi_gps_sat_used, tvb, pos+2, 1, FALSE);
proto_tree_add_float(sattree, hf_isi_gps_sat_strength, tvb, pos+3, 2, signal_strength);
proto_tree_add_float(sattree, hf_isi_gps_sat_elevation, tvb, pos+6, 2, elevation);
proto_tree_add_float(sattree, hf_isi_gps_sat_azimuth, tvb, pos+8, 2, azimuth);
}
break;
case 0x07: // CellInfo GSM
proto_tree_add_item(subtree, hf_isi_gps_mcc, tvb, offset+0, 2, FALSE);
proto_tree_add_item(subtree, hf_isi_gps_mnc, tvb, offset+2, 2, FALSE);
proto_tree_add_item(subtree, hf_isi_gps_lac, tvb, offset+4, 2, FALSE);
proto_tree_add_item(subtree, hf_isi_gps_cid, tvb, offset+6, 2, FALSE);
break;
case 0x08: // CellInfo WCDMA
proto_tree_add_item(subtree, hf_isi_gps_mcc, tvb, offset+0, 2, FALSE);
proto_tree_add_item(subtree, hf_isi_gps_mnc, tvb, offset+2, 2, FALSE);
proto_tree_add_item(subtree, hf_isi_gps_ucid, tvb, offset+4, 4, FALSE);
break;
default:
break;
}
offset += splen - 4;
}
}
static void dissect_isi_gps(tvbuff_t *tvb, packet_info *pinfo, proto_item *isitree) {
proto_item *item = NULL;
proto_tree *tree = NULL;
guint8 cmd;
if(isitree) {
item = proto_tree_add_text(isitree, tvb, 0, -1, "Payload");
tree = proto_item_add_subtree(item, ett_isi_msg);
proto_tree_add_item(tree, hf_isi_gps_cmd, tvb, 0, 1, FALSE);
cmd = tvb_get_guint8(tvb, 0);
switch(cmd) {
case 0x7d: /* GPS Status */
proto_tree_add_item(tree, hf_isi_gps_status, tvb, 2, 1, FALSE);
guint8 status = tvb_get_guint8(tvb, 2);
col_add_fstr(pinfo->cinfo, COL_INFO, "GPS Status Indication: %s", val_to_str(status, isi_gps_status, "unknown (0x%x)"));
break;
case 0x84:
case 0x85:
case 0x86:
case 0x87:
case 0x88:
case 0x89:
case 0x8a:
case 0x8b:
col_add_fstr(pinfo->cinfo, COL_INFO, "unknown A-GPS packet (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;
case 0xF0: /* COMMON_MESSAGE */
dissect_isi_common("GPS", tvb, pinfo, tree);
break;
default:
col_add_fstr(pinfo->cinfo, COL_INFO, "unknown GPS packet (0x%02x)", cmd);
break;
}
}
}
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