更新指纹、优化内存占用

Plugins/mongodb.go

@@ -24,10 +24,14 @@ func MongodbUnauth(info *common.HostInfo) (flag bool, err error) {
 	getlogdata := []byte{72, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 212, 7, 0, 0, 0, 0, 0, 0, 97, 100, 109, 105, 110, 46, 36, 99, 109, 100, 0, 0, 0, 0, 0, 1, 0, 0, 0, 33, 0, 0, 0, 2, 103, 101, 116, 76, 111, 103, 0, 16, 0, 0, 0, 115, 116, 97, 114, 116, 117, 112, 87, 97, 114, 110, 105, 110, 103, 115, 0, 0}
 	realhost := fmt.Sprintf("%s:%v", info.Host, info.Ports)
 	conn, err := net.DialTimeout("tcp", realhost, time.Duration(info.Timeout)*time.Second)
+	defer func() {
+		if conn != nil{
+			conn.Close()
+		}
+	}()
 	if err != nil {
 		return flag, err
 	}
-	defer conn.Close()
 	err = conn.SetReadDeadline(time.Now().Add(time.Duration(info.Timeout)*time.Second))
 	if err != nil {
 		return flag, err