package main

import (
	"net"
)

func LocalIpAddrs() ([]net.IP, error) {
	var localAddrs = []net.IP{}
	addrs, err := net.InterfaceAddrs()
	if err != nil {
		return []net.IP{}, err
	}
	for _, addr := range addrs {
		if ipnet, ok := addr.(*net.IPNet); ok {
			localAddrs = append(localAddrs, ipnet.IP)
		}
	}
	return localAddrs, nil
}

func LocalIpAddrsAsStrings(include_loopbacks bool) ([]string, error) {
	var localAddrsStrings = []string{}
	var err error
	ipaddrs, err := LocalIpAddrs()
	if err != nil {
		return []string{}, err
	}
	for _, ipaddr := range ipaddrs {
		if include_loopbacks || !ipaddr.IsLoopback() {
			localAddrsStrings = append(localAddrsStrings, ipaddr.String())
		}
	}
	return localAddrsStrings, err
}

func IsLoopback(ip_str string) (bool, error) {
	ip := net.ParseIP(ip_str)
	if ip == nil {
		return false, MsgError("Wrong IP format %s", ip_str)
	}
	return ip.IsLoopback(), nil
}