Console tool for finding FabMo tools on your network.

gofabmo.go

package main

import (
	"bufio"
	"fmt"
	"net"
	"os"
	"time"
)

const BROADCAST_PORT = 24862

const MSG_OK = "YES I M !\x00"
const MSG_ERR = "I DNT UNDRSTND !\x00"
const MSG_HOSTNAME = "U NAME ?\x00"
const MSG_REQ = "R U A SBT ?\x00"

const READ_TIMEOUT = 1

func broadcast(socket *net.UDPConn) {
	socket.WriteTo([]byte(MSG_REQ), &net.UDPAddr{
		IP:   net.IPv4(255, 255, 255, 255),
		Port: BROADCAST_PORT,
	})
}

func listen(socket *net.UDPConn) {

	buf := make([]byte, 1024)

	for {
		socket.SetReadDeadline(time.Now().Add(READ_TIMEOUT * time.Second))
		n, addr, err := socket.ReadFromUDP(buf)
		if n > 0 && err == nil {
			fmt.Printf("FabMo Tool Discovered: %v:%d\n", addr.IP, 9876)
		}
	}
}

func main() {

	// Greeting
	fmt.Println("------------------------------------------")
	fmt.Println("            FabMo Tool Finder")
	fmt.Println("")
	fmt.Println("         Press <enter> to exit.")
	fmt.Println("------------------------------------------")

	// Open socket
	socket, err := net.ListenUDP("udp4", &net.UDPAddr{
		IP:   net.IPv4(0, 0, 0, 0),
		Port: BROADCAST_PORT,
	})
	defer socket.Close()
	if err != nil {
		fmt.Println("Error : ", err)
		return
	}

	// Perform detection
	go listen(socket)
	broadcast(socket)

	// Wait for user to quit
	reader := bufio.NewReader(os.Stdin)
	reader.ReadString('\n')
}