From 98327a94cce7597589ac22b8557c5d9a2a03464d Mon Sep 17 00:00:00 2001
From: Nayana Bidari <nybidari@google.com>
Date: Mon, 13 Jan 2020 09:11:40 -0800
Subject: Add test for iptables TCP rule

Added tests for tcp protocol with input and output rules including options sport and dport
Increased timeout in iptables_test as TCP tests were timing out with existing value.
---
 test/iptables/iptables_util.go | 55 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 55 insertions(+)

(limited to 'test/iptables/iptables_util.go')

diff --git a/test/iptables/iptables_util.go b/test/iptables/iptables_util.go
index 3a4d11f1a..44945bd89 100644
--- a/test/iptables/iptables_util.go
+++ b/test/iptables/iptables_util.go
@@ -80,3 +80,58 @@ func sendUDPLoop(ip net.IP, port int, duration time.Duration) error {
 
 	return nil
 }
+
+// listenTCP listens for connections on a TCP port
+func listenTCP(port int, timeout time.Duration) error {
+	localAddr := net.TCPAddr{
+		Port: port,
+	}
+
+	// Starts listening on port
+	lConn, err := net.ListenTCP("tcp4", &localAddr)
+	if err != nil {
+		return err
+	}
+	defer lConn.Close()
+
+	// Accept connections on port
+	lConn.SetDeadline(time.Now().Add(timeout))
+	conn, err := lConn.AcceptTCP()
+	if err == nil {
+		conn.Close()
+	}
+	return err
+}
+
+// connectTCP connects the TCP server over specified local port, server IP
+// and remote/server port
+func connectTCP(ip net.IP, remotePort int, localPort int, duration time.Duration) error {
+	remote := net.TCPAddr{
+		IP: ip,
+		Port: remotePort,
+	}
+
+	local := net.TCPAddr{
+		Port: localPort,
+	}
+
+	// Container may not be up. Retry DialTCP
+	// over a given duration
+	to := time.After(duration)
+	var res error
+	for timedOut := false; !timedOut; {
+		conn, err := net.DialTCP("tcp4", &local, &remote)
+		res = err
+		if res == nil {
+			conn.Close()
+			return nil
+		}
+		select{
+		case <-to:
+			timedOut = true
+		default:
+			time.Sleep(200 * time.Millisecond)
+		}
+	}
+        return res
+}
-- 
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