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ip.go
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/
ip.go
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package ip
import (
"errors"
"net"
)
func GetLocalIP() (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 := getIpFromAddr(addr)
if ip == nil {
continue
}
return ip, nil
}
}
return nil, errors.New("connected to the network?")
}
func GetLocalIPStr() string {
ip, err := GetLocalIP()
if err != nil {
return ""
}
return ip.String()
}
func getIpFromAddr(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
}