crip/main.go

package main

import (
	"fmt"
	"log"
	"net"

	"github.com/crip/ripv2"
)

func main() {
	rip := ripv2.New()
	addr := net.UDPAddr{
		Port: 520,
		IP:   net.ParseIP("224.0.0.9"),
	}
	iface := net.Interface{
		Name:  "enp1s0f1",
		Flags: net.FlagMulticast,
	}
	conn, err := net.ListenMulticastUDP("udp4", &iface, &addr)
	if err != nil {
		log.Fatalln(err)
	}
	defer conn.Close()
	buff := make([]byte, 1024)

	log.Println("waiting")
	for {
		n, UDPAddr, err := conn.ReadFromUDP(buff)
		if err != nil {
			log.Fatalln(err)
		}
		_ = UDPAddr

		if err := rip.MParse(&buff, n); err != nil {
			log.Fatalln(err)
		}

		/* Just testing the parsing output */
		for i := 0; i < 24; i++ {
			if rip.RIP[i].Metric == 0 {
				break
			}
			fmt.Printf("%d\t%s\t%s\t%s\t%d\n", rip.RIP[i].AFI, rip.RIP[i].Addr.String(), rip.RIP[i].Subnet.String(), rip.RIP[i].Nexthop.String(), rip.RIP[i].Metric)
		}
		fmt.Println("")
	}
}