test/e2e/network: add Service internalTrafficPolicy test pod to pod

Signed-off-by: Andrew Sy Kim <kim.andrewsy@gmail.com>

test/e2e/network/util.go

@@ -141,6 +141,35 @@ func execSourceIPTest(sourcePod v1.Pod, targetAddr string) (string, string) {
 	return sourcePod.Status.PodIP, host
 }
 
+// execHostnameTest executes curl to access "/hostname" endpoint on target address
+// from given Pod to check the hostname of the target destination.
+func execHostnameTest(sourcePod v1.Pod, targetAddr, targetHostname string) {
+	var (
+		err     error
+		stdout  string
+		timeout = 2 * time.Minute
+	)
+
+	framework.Logf("Waiting up to %v to get response from %s", timeout, targetAddr)
+	cmd := fmt.Sprintf(`curl -q -s --connect-timeout 30 %s/hostname`, targetAddr)
+	for start := time.Now(); time.Since(start) < timeout; time.Sleep(2 * time.Second) {
+		stdout, err = framework.RunHostCmd(sourcePod.Namespace, sourcePod.Name, cmd)
+		if err != nil {
+			framework.Logf("got err: %v, retry until timeout", err)
+			continue
+		}
+		// Need to check output because it might omit in case of error.
+		if strings.TrimSpace(stdout) == "" {
+			framework.Logf("got empty stdout, retry until timeout")
+			continue
+		}
+		break
+	}
+
+	framework.ExpectNoError(err)
+	framework.ExpectEqual(strings.TrimSpace(stdout), targetHostname)
+}
+
 // createSecondNodePortService creates a service with the same selector as config.NodePortService and same HTTP Port
 func createSecondNodePortService(f *framework.Framework, config *e2enetwork.NetworkingTestConfig) (*v1.Service, int) {
 	svc := &v1.Service{