package main

import (
	"log"
	"net"
)

func printInterfaces() error {
	ifs, err := net.Interfaces()
	if err != nil {
		return err
	}

	for _, i := range ifs {
		if i.Flags&net.FlagLoopback != 0 {
			continue
		}

		addrs, err := i.Addrs()
		if err != nil {
			return err
		}
		for _, addr := range addrs {
			in, ok := addr.(*net.IPNet)
			if ok && in.IP.To4() != nil {
				log.Printf("interface %v: %v", i.Name, in.IP)
				break
			}
		}
	}

	return nil
}