register goja func to check udp port (#5397)

* register goja func to check port with network param

* register goja func to check udp port

pkg/js/devtools/scrapefuncs/README.md

@@ -42,7 +42,11 @@ Description: getNetworkPort registers defaultPort and returns defaultPort if it
 
 Name: isPortOpen
 Signatures: "isPortOpen(host string, port string, [timeout int]) bool"
-Description: isPortOpen checks if given port is open on host. timeout is optional and defaults to 5 seconds
+Description: isPortOpen checks if given TCP port is open on host. timeout is optional and defaults to 5 seconds
+
+Name: isUDPPortOpen
+Signatures: "isUDPPortOpen(host string, port string, [timeout int]) bool"
+Description: isUDPPortOpen checks if the given UDP port is open on the host. Timeout is optional and defaults to 5 seconds.
 
 Name: ToBytes
 Signatures: "ToBytes(...interface{}) []byte"

pkg/js/global/scripts.go

@@ -109,7 +109,7 @@ func initBuiltInFunc(runtime *goja.Runtime) {
 		Signatures: []string{
 			"isPortOpen(host string, port string, [timeout int]) bool",
 		},
-		Description: "isPortOpen checks if given port is open on host. timeout is optional and defaults to 5 seconds",
+		Description: "isPortOpen checks if given TCP port is open on host. timeout is optional and defaults to 5 seconds",
 		FuncDecl: func(host string, port string, timeout ...int) (bool, error) {
 			timeoutInSec := 5
 			if len(timeout) > 0 {
@@ -124,6 +124,27 @@ func initBuiltInFunc(runtime *goja.Runtime) {
 		},
 	})
 
+	_ = gojs.RegisterFuncWithSignature(runtime, gojs.FuncOpts{
+		Name: "isUDPPortOpen",
+		Signatures: []string{
+			"isUDPPortOpen(host string, port string, [timeout int]) bool",
+		},
+		Description: "isUDPPortOpen checks if the given UDP port is open on the host. Timeout is optional and defaults to 5 seconds.",
+		FuncDecl: func(host string, port string, timeout ...int) (bool, error) {
+			timeoutInSec := 5
+			if len(timeout) > 0 {
+				timeoutInSec = timeout[0]
+			}
+			conn, err := net.DialTimeout("udp", net.JoinHostPort(host, port), time.Duration(timeoutInSec)*time.Second)
+			if err != nil {
+				return false, err
+			}
+			_ = conn.Close()
+
+			return true, nil
+		},
+	})
+
 	_ = gojs.RegisterFuncWithSignature(runtime, gojs.FuncOpts{
 		Name: "ToBytes",
 		Signatures: []string{