Add statistics printed out every minute

knockr.go

@@ -21,6 +21,8 @@ var (
 	whitelist = make(map[string]int64)
 	blacklist []string
 	arguments *knockArguments
+	traffic_in int64
+	traffic_out int64
 )
 
 func main() {
@@ -33,7 +35,15 @@ func main() {
 	// Launch listeners
 	go listener(arguments.WhitelistPort, whitelist_handler)
 	go listener(arguments.BlacklistPort, blacklist_handler)
-	listener(arguments.GatewayPort, gateway_handler)
+	go listener(arguments.GatewayPort, gateway_handler)
+	stats()
+}
+
+func stats() {
+	for {
+		time.Sleep(60*time.Second)
+		fmt.Println("[STS] In ", traffic_in/1024, "KB, Out ", traffic_out/1024, "KB");
+	}
 }
 
 func listener(port int, listen_func func(c net.Conn)) {
@@ -163,7 +173,12 @@ func proxy(c net.Conn) {
 		fmt.Println("[ERR] Proxy connection to server failed")
 		fmt.Println("      Error is ", err)
 	} else {
-		go io.Copy(c, ln)
-		io.Copy(ln, c)
+		// A bit of cluttery code for statistics purposes, sorry.
+		go func() {
+			delta_traffic_in, _ := io.Copy(c, ln)
+			traffic_in += delta_traffic_in
+		}()
+		delta_traffic_out, _ := io.Copy(ln, c)
+		traffic_out += delta_traffic_out
 	}
 }