使用golang解析网卡参数

Posted 2022-01-30 我要出家当道士

        下面介绍一个简单的demo，获取网卡的参数，主要包括：网卡Index，网卡名称、IPV4地址、MAC地址、MTU、Up？、Broadcast？、Loopback？、PointToPoint？、Multicast？

        虽然 golang 中 net.Interfaces() 函数也提供了方法，但是不包含网卡的IP地址信息，所以我就多做了一步，使用 Addrs() 提取IPV4地址并整合了一下。

package main

import (
	"log"
	"net"
	"strconv"
	"strings"
)

type Nic struct 
	Index 			int
	Name 			string
	Ipv4 			*net.IPNet
	Mac  			net.HardwareAddr
	Mtu  			int
	Alive			bool
	Broadcast		bool
	Loopback    	bool
	PointToPoint	bool
	Multicast		bool



func parseIp(s string) *net.IPNet 
	i := strings.Index(s, "/")
	if i < 0 
		log.Print("the ip address should be xxx.xxx.xxx.xxx/24")
		return nil
	
	addr, mask := s[:i], s[i+1:]
	ip := net.ParseIP(addr)
	n, _ := strconv.Atoi(mask)
	if n > 32 || n < 0
		log.Print("ipv4 address' mask should be upper than 0 and lower than 32")
		return nil
	
	m := net.CIDRMask(n, 8*4)
	return &net.IPNetIP: ip, Mask: m


func GetInterface() []Nic
	interfaces, err := net.Interfaces()
	if err != nil
		log.Print(err)
	
	var nics []Nic
	for i := 0; i < len(interfaces); i++
		nic := Nic
			Index: interfaces[i].Index,
			Name: interfaces[i].Name,
			Mac: interfaces[i].HardwareAddr,
			Mtu: interfaces[i].MTU,
		
		if interfaces[i].Flags & 1 == 1
			nic.Alive = true
		
		if interfaces[i].Flags & 2 == 1
			nic.Broadcast = true
		
		if interfaces[i].Flags & 4 == 1
			nic.Loopback = true
		
		if interfaces[i].Flags & 8 == 1
			nic.PointToPoint = true
		
		if interfaces[i].Flags & 16 == 1
			nic.Multicast = true
		
		address, _ := interfaces[i].Addrs()
		for _, v := range address
			ipStr := v.String()
			if 4 == len(strings.Split(ipStr,"."))
				nic.Ipv4 = parseIp(ipStr)
			
		
		nics = append(nics, nic)
	
	return nics



func main()
	interfaces := GetInterface()
	for i := 0; i < len(interfaces); i++
		log.Print(interfaces[i])