gistfile1.txt

package main

import (
	"fmt"
	"log"
	"net"
)

const host string = "0.0.0.0"
const port int = 12345

func main() {
	l, err := net.Listen("tcp", host+":"+fmt.Sprintf("%d", port))
	if err != nil {
		log.Panicln(err)
	}
	log.Println("Listening on", host+":"+fmt.Sprintf("%d", port))
	defer l.Close()

	for {
		conn, err := l.Accept()
		if err != nil {
			log.Panicln(err)
		}

		go handleRequest(conn)
	}
}

func handleRequest(conn net.Conn) {
	log.Println("Accepte connection from", conn.RemoteAddr())
	defer conn.Close()
	defer log.Println("Close connection from", conn.RemoteAddr())

	conn.Write([]byte(fmt.Sprintln(conn.LocalAddr())))

	for {
		buf := make([]byte, 1024)
		size, err := conn.Read(buf)
		if err != nil {
			return
		}
		data := buf[:size]
		conn.Write(data)
	}
}