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autolock.go
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autolock.go
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package main
import (
"flag"
"fmt"
"log"
"os"
"os/exec"
"regexp"
"strconv"
"sync"
"time"
)
var (
connected = false
connMtx sync.Mutex
// Phone/Bluetooth device address
addr = ""
)
func main() {
fRfcomm := flag.String("rfcomm", "/usr/bin/rfcomm", "rfcomm executable")
fHcitool := flag.String("hcitool", "/usr/bin/hcitool", "hcitool executable")
fLock := flag.String("lock", "slock", "locker executable")
fChannel := flag.String("channel", "2", "channel")
fDevice := flag.String("device", "0", "device")
fPingTime := flag.Duration("ping", 10*time.Second, "ping time")
fConnTime := flag.Duration("conn", 10*time.Second, "conn time")
fProximity := flag.Int("proximity", -1, "proximity")
flag.Usage = func() {
fmt.Fprintln(os.Stderr, "Usage: "+os.Args[0]+" [options] <device:mac:addr>")
flag.PrintDefaults()
}
flag.Parse()
if flag.NArg() == 1 {
addr = flag.Arg(0)
} else if addr == "" {
flag.Usage()
os.Exit(1)
}
go connect(*fRfcomm, *fDevice, addr, *fChannel, *fConnTime)
var lockCmd *exec.Cmd
locked := false
r := regexp.MustCompile("-?[0-9]+")
for {
command := exec.Command(*fHcitool, "rssi", addr)
{
connMtx.Lock()
connected := connected
connMtx.Unlock()
if !connected {
// We wait for the connection to become active again.
// Most likely the phone went out of range.
time.Sleep(*fConnTime)
continue
}
}
res, err := command.CombinedOutput()
if err != nil {
log.Printf("%s: %v (%s)", command.Args, err, res)
// Ignore error and try again
time.Sleep(1 * time.Second)
continue
}
if len(res) == 0 {
log.Println("Could not find device.")
continue
}
out := string(res)
proximity, _ := strconv.Atoi(r.FindString(out))
if proximity >= *fProximity && locked {
if lockCmd == nil {
// Most likely the command finished executing.
// I might have unlocked the machine manually.
locked = false
time.Sleep(*fPingTime)
continue
}
err := lockCmd.Process.Kill()
if err != nil {
log.Println(err)
} else {
locked = false
}
} else if !locked {
lockCmd = exec.Command(*fLock)
err := lockCmd.Start()
if err != nil {
log.Println(err)
}
locked = true
}
time.Sleep(*fPingTime)
}
}
func connect(rfcomm, device, addr, channel string, connTime time.Duration) {
for {
command := exec.Command(rfcomm, "connect", device, addr, channel)
connMtx.Lock()
connected = true
connMtx.Unlock()
res, err := command.CombinedOutput()
if err != nil {
log.Fatalf("%s: %v (%s)", command.Args, err, res)
}
log.Println("Disconnected")
connMtx.Lock()
connected = false
connMtx.Unlock()
time.Sleep(connTime)
}
}