flood.go

package main

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

func main() {
	log.Fatal(run())
}

const numWorkers = 10

func run() error {
	addr, err := net.ResolveUDPAddr("udp", "localhost:0")
	if err != nil {
	  return err
	}
	ln, err := net.ListenUDP("udp", addr)
	if err != nil {
	  return err
	}
	fmt.Println("Listening on:", ln.LocalAddr())
	raddr, err := net.ResolveUDPAddr("udp", "localhost:12345")
	if err != nil {
	  return err
	}

	for i := 0; i < numWorkers; i++ {
		go flood(ln, raddr)
	}
	select {}
}

func flood(conn *net.UDPConn, raddr *net.UDPAddr)  {
	b := []byte("foobar")
	for {
		if _, err := conn.WriteTo(b, raddr); err != nil {
			panic(err)
		}
	}
}