/
gps.go
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/
gps.go
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package modules
import (
"fmt"
"io"
"time"
"github.com/bettercap/bettercap/core"
"github.com/bettercap/bettercap/log"
"github.com/bettercap/bettercap/session"
"github.com/adrianmo/go-nmea"
"github.com/tarm/serial"
)
type GPS struct {
session.SessionModule
serialPort string
baudRate int
serial *serial.Port
}
func NewGPS(s *session.Session) *GPS {
gps := &GPS{
SessionModule: session.NewSessionModule("http.server", s),
serialPort: "/dev/ttyUSB0",
baudRate: 19200,
}
gps.AddParam(session.NewStringParameter("gps.device",
gps.serialPort,
"",
"Serial device of the GPS hardware."))
gps.AddParam(session.NewIntParameter("gps.baudrate",
fmt.Sprintf("%d", gps.baudRate),
"Baud rate of the GPS serial device."))
gps.AddHandler(session.NewModuleHandler("gps on", "",
"Start acquiring from the GPS hardware.",
func(args []string) error {
return gps.Start()
}))
gps.AddHandler(session.NewModuleHandler("gps off", "",
"Stop acquiring from the GPS hardware.",
func(args []string) error {
return gps.Stop()
}))
gps.AddHandler(session.NewModuleHandler("gps.show", "",
"Show the last coordinates returned by the GPS hardware.",
func(args []string) error {
return gps.Show()
}))
return gps
}
func (gps *GPS) Name() string {
return "gps"
}
func (gps *GPS) Description() string {
return "A module talking with GPS hardware on a serial interface."
}
func (gps *GPS) Author() string {
return "Simone Margaritelli <evilsocket@protonmail.com>"
}
func (gps *GPS) Configure() (err error) {
if gps.Running() {
return session.ErrAlreadyStarted
} else if err, gps.serialPort = gps.StringParam("gps.device"); err != nil {
return err
} else if err, gps.baudRate = gps.IntParam("gps.baudrate"); err != nil {
return err
}
gps.serial, err = serial.OpenPort(&serial.Config{
Name: gps.serialPort,
Baud: gps.baudRate,
ReadTimeout: time.Second * 1,
})
return
}
func (gps *GPS) readLine() (line string, err error) {
var n int
b := make([]byte, 1)
for {
if n, err = gps.serial.Read(b); err != nil {
return
} else if n == 1 {
if b[0] == '\n' {
return core.Trim(line), nil
} else {
line += string(b[0])
}
}
}
}
func (gps *GPS) Show() error {
fmt.Printf("latitude:%f longitude:%f quality:%s satellites:%d altitude:%f\n",
gps.Session.GPS.Latitude,
gps.Session.GPS.Longitude,
gps.Session.GPS.FixQuality,
gps.Session.GPS.NumSatellites,
gps.Session.GPS.Altitude)
gps.Session.Refresh()
return nil
}
func (gps *GPS) Start() error {
if err := gps.Configure(); err != nil {
return err
}
return gps.SetRunning(true, func() {
defer gps.serial.Close()
for gps.Running() {
if line, err := gps.readLine(); err == nil {
if info, err := nmea.Parse(line); err == nil {
s := info.Sentence()
// http://aprs.gids.nl/nmea/#gga
if s.Type == "GNGGA" {
gps.Session.GPS = info.(nmea.GNGGA)
} else {
log.Debug("Skipping message %s: %v", s.Type, s)
}
} else {
log.Debug("Error parsing line '%s': %s", line, err)
}
} else if err != io.EOF {
log.Warning("Error while reading serial port: %s", err)
}
}
})
}
func (gps *GPS) Stop() error {
return gps.SetRunning(false, func() {
// let the read fail and exit
gps.serial.Close()
})
}