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net.go
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net.go
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package net
import (
"errors"
"io/ioutil"
"net"
"net/http"
"regexp"
)
func ExternalIPString() string {
ip, _ := ExternalIP()
return ip.String()
}
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 := ipFromAddr(addr)
if ip == nil {
continue
}
return ip, nil
}
}
return nil, errors.New("network error")
}
func ipFromAddr(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 CommonIP() (string, error) {
res, err := http.Get("http://txt.go.sohu.com/ip/soip")
if err != nil {
return "", errors.New("network error")
}
body, _ := ioutil.ReadAll(res.Body)
reg := regexp.MustCompile(`\d+.\d+.\d+.\d+`)
return string(reg.Find(body)), nil
}
// 获取本机ip地址
func LocalIPv4Address() (string, error) {
addrs, err := net.InterfaceAddrs()
if err != nil {
return "", err
}
for _, a := range addrs {
if ipnet, ok := a.(*net.IPNet); ok && !ipnet.IP.IsLoopback() {
if ipnet.IP.To4() != nil {
return ipnet.IP.String(), nil
}
}
}
return "", errors.New("no ipv4 address found")
}