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- package ip
- import (
- "net"
- "strings"
- )
- func ExternalIP() (res []string) {
- inters, err := net.Interfaces()
- if err != nil {
- return
- }
- for _, inter := range inters {
- if !strings.HasPrefix(inter.Name, "lo") {
- addrs, err := inter.Addrs()
- if err != nil {
- continue
- }
- for _, addr := range addrs {
- if ipnet, ok := addr.(*net.IPNet); ok {
- if ipnet.IP.IsLoopback() || ipnet.IP.IsLinkLocalMulticast() || ipnet.IP.IsLinkLocalUnicast() {
- continue
- }
- if ip4 := ipnet.IP.To4(); ip4 != nil {
- switch true {
- case ip4[0] == 10:
- continue
- case ip4[0] == 172 && ip4[1] >= 16 && ip4[1] <= 31:
- continue
- case ip4[0] == 192 && ip4[1] == 168:
- continue
- default:
- res = append(res, ipnet.IP.String())
- }
- }
- }
- }
- }
- }
- return
- }
- // InternalIP get internal ip.
- func InternalIP() string {
- inters, err := net.Interfaces()
- if err != nil {
- return ""
- }
- for _, inter := range inters {
- if !isUp(inter.Flags) {
- continue
- }
- if !strings.HasPrefix(inter.Name, "lo") {
- addrs, err := inter.Addrs()
- if err != nil {
- continue
- }
- for _, addr := range addrs {
- if ipnet, ok := addr.(*net.IPNet); ok && !ipnet.IP.IsLoopback() {
- if ipnet.IP.To4() != nil {
- return ipnet.IP.String()
- }
- }
- }
- }
- }
- return ""
- }
- // isUp Interface is up
- func isUp(v net.Flags) bool {
- return v&net.FlagUp == net.FlagUp
- }
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