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package main import ( "flag" "fmt" "io" "net" "net/http" "os" ) var get_ip = flag.String("get_ip", "", "external|internal") func main() { fmt.Println("Usage of ./getmyip --get_ip=(external|internal)") flag.Parse() if *get_ip == "external" { get_external() } if *get_ip == "internal" { get_internal() } } func get_external() { resp, err := http.Get("http://myexternalip.com/raw") if err != nil { os.Stderr.WriteString(err.Error()) os.Stderr.WriteString("\n") os.Exit(1) } defer resp.Body.Close() io.Copy(os.Stdout, resp.Body) os.Exit(0) } func get_internal() { addrs, err := net.InterfaceAddrs() if err != nil { os.Stderr.WriteString("Oops:" + err.Error()) os.Exit(1) } for _, a := range addrs { if ipnet, ok := a.(*net.IPNet); ok && !ipnet.IP.IsLoopback() { if ipnet.IP.To4() != nil { os.Stdout.WriteString(ipnet.IP.String() + "\n") } } } os.Exit(0) }
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原文地址:http://my.oschina.net/lengxugz/blog/477982