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local gps = require "gps"
local nmap = require "nmap"
local os = require "os"
local shortport = require "shortport"
local stdnse = require "stdnse"
description = [[
Retrieves GPS time, coordinates and speed from the GPSD network daemon.
]]
---
-- @usage
-- nmap -p 2947 <ip> --script gpsd-info
--
-- @output
-- PORT STATE SERVICE REASON
-- 2947/tcp open gpsd-ng syn-ack
-- | gpsd-info:
-- | Time of fix: Sat Apr 14 15:54:23 2012
-- | Coordinates: 59.321685,17.886493
-- |_ Speed: - knots
--
-- @args gpsd-info.timeout timespec defining how long to wait for data (default 10s)
author = "Patrik Karlsson"
license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
categories = {"discovery", "safe"}
portrule = shortport.port_or_service(2947, "gpsd-ng", "tcp")
local arg_timeout = stdnse.parse_timespec(stdnse.get_script_args(SCRIPT_NAME .. ".timeout"))
arg_timeout = arg_timeout or 10
local function updateData(gpsinfo, entry)
for k, v in pairs(gpsinfo) do
if ( entry[k] and 0 < #tostring(entry[k]) ) then
gpsinfo[k] = entry[k]
end
end
end
local function hasAllData(gpsinfo)
for k, v in pairs(gpsinfo) do
if ( k ~= "speed" and v == '-' ) then
return false
end
end
return true
end
local function fail(err) return ("\n ERROR: %s"):format(err or "") end
action = function(host, port)
local gpsinfo = {
longitude = "-",
latitude = "-",
speed = "-",
time = "-",
date = "-",
}
local socket = nmap.new_socket()
socket:set_timeout(1000)
local status = socket:connect(host, port)
if ( not(status) ) then
return fail("Failed to connect to server")
end
-- get the banner
local status, line = socket:receive_lines(1)
socket:send('?WATCH={"enable":true,"nmea":true}\r\n')
local start_time = os.time()
repeat
local entry
status, line = socket:receive_buf("\r\n", false)
if ( status ) then
status, entry = gps.NMEA.parse(line)
if ( status ) then
updateData(gpsinfo, entry)
end
end
until( os.time() - start_time > arg_timeout or hasAllData(gpsinfo) )
socket:send('?WATCH={"enable":false}\r\n')
if ( not(hasAllData(gpsinfo)) ) then
return
end
local output = {
("Time of fix: %s"):format(stdnse.format_timestamp(gps.Util.convertTime(gpsinfo.date, gpsinfo.time))),
("Coordinates: %.4f,%.4f"):format(tonumber(gpsinfo.latitude), tonumber(gpsinfo.longitude)),
("Speed: %s knots"):format(gpsinfo.speed)
}
return stdnse.format_output(true, output)
end