添加根据name 获取地址ip

main.go

@@ -95,7 +95,7 @@ func broadcast()  {
 	}
 
 	//ip 会变化
-	ip,err := util.GetLocalIP()
+	ip,err := util.GetLocalIpByName("wlan0")
 	if err != nil {
 		tlog.Error("broadcast",err)
 	}
@@ -121,7 +121,7 @@ func broadcast()  {
 		if err != nil{
 			panic(err)
 		}
-		tlog.Info("broadcast","udp",send)
+		tlog.Info("ip:",ip.IP.String(),"broadcast","udp",send)
 		time.Sleep(time.Second*1)
 	}
 }
\ No newline at end of file

pkg/util/util.go

@@ -44,6 +44,35 @@ func GetLocalIP() (ipv4 *net.IPNet, err error) {
 	return
 }
 
+func GetLocalIpByName(name string) (ipv4 *net.IPNet, err error) {
+	if name == "" {
+		return nil,errors.New("name not empty")
+	}
+
+	inter,err := net.InterfaceByName(name)
+	if err != nil {
+		return nil,err
+	}
+	var (
+		addrs   []net.Addr
+		ipNet   *net.IPNet // IP地址
+		isIpNet bool
+	)
+	if addrs,err = inter.Addrs(); err != nil {
+		return nil,err
+	}
+	for _, addr := range addrs {
+		if ipNet, isIpNet = addr.(*net.IPNet); isIpNet && !ipNet.IP.IsLoopback(){
+			// 跳过IPV6
+			if ipNet.IP.To4() != nil{
+				ipv4 = ipNet// 192.168.1.1
+				return
+			}
+		}
+	}
+	return nil,nil
+}
+
 
 func GetExternal() (string,error) {
 	resp, err := http.Get("http://myexternalip.com/raw")