package main

import (
	"fmt"
	"net"
)

func serveProtoFamilyIPv4(ch chan string) {
	b := make([]byte, 1024)
	c, _ := net.ListenPacket("udp4", "0.0.0.0:5963")
	for {
		n, _, err := c.ReadFrom(b)
		if err != nil {
			fmt.Printf("pf4: %v\n", err)
		} else {
			ch <- "pf4: " + string(b[:n])
		}
	}
}

func serveProtoFamilyIPv6(ch chan string) {
	b := make([]byte, 1024)
	c, _ := net.ListenPacket("udp6", "[::]:5963")
	for {
		n, _, err := c.ReadFrom(b)
		if err != nil {
			fmt.Printf("pf6: %v\n", err)
		} else {
			ch <- "pf6: " + string(b[:n])
		}
	}
}

func main() {
	ch := make(chan string)
	go serveProtoFamilyIPv4(ch)
	go serveProtoFamilyIPv6(ch)
	for {
		fmt.Printf("%s\n", <-ch)
	}
}