enumIntfs.go

package main

import (
	"encoding/json"
	"fmt"
	"net"
)

type netifs struct {
	Addrs  []string
	MTU    int
	Name   string
	HWAddr string
	Flags  string
}

type outputNetif struct {
	NetIfs []netifs `json:"netifs,omitempty"`
}

func getAddrs(naddrs []net.Addr) []string {
	var ret []string

	for n := range naddrs {
		ret = append(ret, naddrs[n].String())
	}

	return ret
}

func getNetIfs() []netifs {
	var ret []netifs

	ni, err := net.Interfaces()

	if err != nil {
		return nil
	}

	for n := range ni {
		var taddrs []string

		naddrs, err := ni[n].Addrs()
		if err == nil {
			taddrs = getAddrs(naddrs)
		}

		ret = append(ret, netifs{Addrs: taddrs,
			MTU:    ni[n].MTU,
			Name:   ni[n].Name,
			HWAddr: ni[n].HardwareAddr.String(),
			Flags:  ni[n].Flags.String()})
	}

	return ret
}

func main() {
	ni := getNetIfs()
	slcB, _ := json.Marshal(ni)
	fmt.Println(string(slcB))
}