scan

go/bhg/scanner.go

@@ -0,0 +1,25 @@
+package main
+
+import (
+	"fmt"
+	"net"
+	"sync"
+)
+
+func main() {
+	var wg sync.WaitGroup
+	for i := 1; i <= 65535; i++ {
+		wg.Add(1)
+		go func(j int) {
+			defer wg.Done()
+			address := fmt.Sprintf("localhost:%d", j)
+			conn, err := net.Dial("tcp", address)
+			if err != nil {
+				return
+			}
+			conn.Close()
+			fmt.Printf("port %d is open\n", j)
+		}(i)
+	}
+	wg.Wait()
+}