Add maid.go

go.mod

@@ -0,0 +1 @@
+module goudpserver

main.go

@@ -0,0 +1,51 @@
+// go build -ldflags "-s -w"
+// goudpserver -ip=0.0.0.0 -port=10003
+// ncat -u localhost 10003
+
+package main
+
+import (
+	"flag"
+	"fmt"
+	"net"
+	"runtime"
+)
+
+func lstn(connection *net.UDPConn, alarm chan struct{}) {
+	buffer := make([]byte, 1024)
+	n, remoteAddr, err := 0, new(net.UDPAddr), error(nil)
+	for err == nil {
+		n, remoteAddr, err = connection.ReadFromUDP(buffer)
+		fmt.Println("from", remoteAddr, "-", buffer[:n])
+	}
+
+	fmt.Println("Listener failed (", err, ")!")
+	alarm <- struct{}{}
+}
+
+func main() {
+	argIP := flag.String("ip", "0.0.0.0", "Listen IP address")
+	argPort := flag.Int("port", 10003, "Listen Port number")
+	flag.Parse()
+
+	fmt.Println("IP Address: ", *argIP)
+	fmt.Println("Port Number: ", *argPort)
+
+	addr := net.UDPAddr{
+		Port: *argPort,
+		// IP:   net.IP{0, 0, 0, 0},
+		IP: net.ParseIP(*argIP),
+	}
+	connection, err := net.ListenUDP("udp", &addr)
+	if err != nil {
+		panic(err)
+	}
+	alarm := make(chan struct{})
+	fmt.Println("CPU Threads: ", runtime.NumCPU())
+	for i := 0; i < runtime.NumCPU(); i++ {
+		go lstn(connection, alarm)
+	}
+
+	msg := <-alarm
+	fmt.Println(msg)
+}