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currip.go
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currip.go
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package goutil
import (
"bytes"
"errors"
"fmt"
"io/ioutil"
"net"
"net/http"
)
// ExtranetIP get external IP addr.
// NOTE: Query IP information from the service API: http://pv.sohu.com/cityjson?ie=utf-8
func ExtranetIP() (ip string, err error) {
defer func() {
if p := recover(); p != nil {
err = fmt.Errorf("get external IP error: %v", p)
} else if err != nil {
err = errors.New("get external IP error: " + err.Error())
}
}()
resp, err := http.Get("http://pv.sohu.com/cityjson?ie=utf-8")
if err != nil {
return
}
b, err := ioutil.ReadAll(resp.Body)
resp.Body.Close()
if err != nil {
return
}
idx := bytes.Index(b, []byte(`"cip": "`))
b = b[idx+len(`"cip": "`):]
idx = bytes.Index(b, []byte(`"`))
b = b[:idx]
ip = string(b)
return
}
// IntranetIP get internal IP addr.
func IntranetIP() (string, error) {
ifaces, err := net.Interfaces()
if err != nil {
return "", 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 "", err
}
for _, addr := range addrs {
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() {
continue
}
ip = ip.To4()
if ip == nil {
continue // not an ipv4 address
}
return ip.String(), nil
}
}
return "", errors.New("no network connection")
}