[转]golang 获取本机真实IP

 

原文：https://www.cnblogs.com/chaselogs/p/11301940.html

----------------

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62

package main   import (     "errors"     "fmt"     "net" )   func externalIP() (net.IP, error) {     ifaces, err := net.Interfaces()     if err != nil {         return nil, err     }     for _, iface := range ifaces {         if iface.Flags&net.FlagUp == 0 {             continue // interface down         }         if iface.Flags&net.FlagLoopback != 0 {             continue // loopback interface         }         addrs, err := iface.Addrs()         if err != nil {             return nil, err         }         for _, addr := range addrs {             ip := getIpFromAddr(addr)             if ip == nil {                 continue             }             return ip, nil         }     }     return nil, errors.New("connected to the network?") }   func getIpFromAddr(addr net.Addr) net.IP {     var ip net.IP     switch v := addr.(type) {     case *net.IPNet:         ip = v.IP     case *net.IPAddr:         ip = v.IP     }     if ip == nil || ip.IsLoopback() {         return nil     }     ip = ip.To4()     if ip == nil {         return nil // not an ipv4 address     }       return ip }   func main() {     ip, err := externalIP()     if err != nil {         fmt.Println(err)     }       fmt.Println(ip.String()) }