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- package ip
- import (
- "net"
- "strings"
- )
- func External() (res []string) {
- var (
- err error
- addrs []net.Addr
- inters []net.Interface
- )
- if inters, err = net.Interfaces(); err != nil {
- return
- }
- for _, inter := range inters {
- if !strings.HasPrefix(inter.Name, "lo") {
- if addrs, err = inter.Addrs(); 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
- }
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