From 89d11b4d96b0c40e373f14ba72d570c9b894f976 Mon Sep 17 00:00:00 2001
From: Kevin Krakauer <krakauer@google.com>
Date: Thu, 9 Jan 2020 13:41:52 -0800
Subject: Added a test that we don't pass yet

---
 test/iptables/BUILD            |  4 ++++
 test/iptables/filter_input.go  | 30 ++++++++++++++++++++++++++++++
 test/iptables/iptables_test.go | 16 +++++++++++-----
 test/iptables/iptables_util.go | 40 ++++++++++++++++++++++++++++++++++++++++
 test/iptables/runner/BUILD     |  1 +
 5 files changed, 86 insertions(+), 5 deletions(-)

(limited to 'test')

diff --git a/test/iptables/BUILD b/test/iptables/BUILD
index fa833c3b2..6a9d05828 100644
--- a/test/iptables/BUILD
+++ b/test/iptables/BUILD
@@ -4,6 +4,7 @@ package(licenses = ["notice"])
 
 go_library(
     name = "iptables",
+    testonly = 1,
     srcs = [
         "filter_input.go",
         "iptables.go",
@@ -11,6 +12,9 @@ go_library(
     ],
     importpath = "gvisor.dev/gvisor/test/iptables",
     visibility = ["//test/iptables:__subpackages__"],
+    deps = [
+        "//runsc/testutil",
+    ],
 )
 
 go_test(
diff --git a/test/iptables/filter_input.go b/test/iptables/filter_input.go
index 7c4d469fa..a3f0052b5 100644
--- a/test/iptables/filter_input.go
+++ b/test/iptables/filter_input.go
@@ -28,6 +28,7 @@ const (
 )
 
 func init() {
+	RegisterTestCase(FilterInputDropOnlyUDP{})
 	RegisterTestCase(FilterInputDropUDP{})
 	RegisterTestCase(FilterInputDropUDPPort{})
 	RegisterTestCase(FilterInputDropDifferentUDPPort{})
@@ -65,6 +66,35 @@ func (FilterInputDropUDP) LocalAction(ip net.IP) error {
 	return sendUDPLoop(ip, dropPort, sendloopDuration)
 }
 
+// FilterInputDropOnlyUDP tests that "-p udp -j DROP" only affects UDP traffic.
+type FilterInputDropOnlyUDP struct{}
+
+// Name implements TestCase.Name.
+func (FilterInputDropOnlyUDP) Name() string {
+	return "FilterInputDropOnlyUDP"
+}
+
+// ContainerAction implements TestCase.ContainerAction.
+func (FilterInputDropOnlyUDP) ContainerAction(ip net.IP) error {
+	if err := filterTable("-A", "INPUT", "-p", "udp", "-j", "DROP"); err != nil {
+		return err
+	}
+
+	// Listen for a TCP connection, which should be allowed.
+	if err := listenTCP(acceptPort, sendloopDuration); err != nil {
+		return fmt.Errorf("failed to establish a connection %v", err)
+	}
+
+	return nil
+}
+
+// LocalAction implements TestCase.LocalAction.
+func (FilterInputDropOnlyUDP) LocalAction(ip net.IP) error {
+	// Try to establish a TCP connection with the container, which should
+	// succeed.
+	return connectLoopTCP(ip, acceptPort, sendloopDuration)
+}
+
 // FilterInputDropUDPPort tests that we can drop UDP traffic by port.
 type FilterInputDropUDPPort struct{}
 
diff --git a/test/iptables/iptables_test.go b/test/iptables/iptables_test.go
index d040e971a..beaaf519c 100644
--- a/test/iptables/iptables_test.go
+++ b/test/iptables/iptables_test.go
@@ -160,11 +160,11 @@ func logContainer(output string, err error) {
 	log.Infof(msg)
 }
 
-func TestFilterInputDropUDP(t *testing.T) {
-	if err := singleTest(FilterInputDropUDP{}); err != nil {
-		t.Fatal(err)
-	}
-}
+// func TestFilterInputDropUDP(t *testing.T) {
+// 	if err := singleTest(FilterInputDropUDP{}); err != nil {
+// 		t.Fatal(err)
+// 	}
+// }
 
 // func TestFilterInputDropUDPPort(t *testing.T) {
 // 	if err := singleTest(FilterInputDropUDPPort{}); err != nil {
@@ -183,3 +183,9 @@ func TestFilterInputDropUDP(t *testing.T) {
 // 		t.Fatal(err)
 // 	}
 // }
+
+func TestFilterInputDropOnlyUDP(t *testing.T) {
+	if err := singleTest(FilterInputDropOnlyUDP{}); err != nil {
+		t.Fatal(err)
+	}
+}
diff --git a/test/iptables/iptables_util.go b/test/iptables/iptables_util.go
index 3a4d11f1a..3dcaafb79 100644
--- a/test/iptables/iptables_util.go
+++ b/test/iptables/iptables_util.go
@@ -19,6 +19,8 @@ import (
 	"net"
 	"os/exec"
 	"time"
+
+	"gvisor.dev/gvisor/runsc/testutil"
 )
 
 const iptablesBinary = "iptables"
@@ -80,3 +82,41 @@ func sendUDPLoop(ip net.IP, port int, duration time.Duration) error {
 
 	return nil
 }
+
+func listenTCP(port int, timeout time.Duration) error {
+	localAddr := net.TCPAddr{Port: acceptPort}
+	listener, err := net.ListenTCP("tcp4", &localAddr)
+	if err != nil {
+		return err
+	}
+	defer listener.Close()
+	listener.SetDeadline(time.Now().Add(timeout))
+	conn, err := listener.AcceptTCP()
+	if err != nil {
+		return fmt.Errorf("failed to establish a connection %v", err)
+	}
+	defer conn.Close()
+
+	return nil
+}
+
+func connectLoopTCP(ip net.IP, port int, timeout time.Duration) error {
+	contAddr := net.TCPAddr{
+		IP:   ip,
+		Port: port,
+	}
+	// The container may not be listening when we first connect, so retry
+	// upon error.
+	cb := func() error {
+		conn, err := net.DialTCP("tcp4", nil, &contAddr)
+		if conn != nil {
+			conn.Close()
+		}
+		return err
+	}
+	if err := testutil.Poll(cb, timeout); err != nil {
+		return fmt.Errorf("timed out waiting to send IP, most recent error: %v", err)
+	}
+
+	return nil
+}
diff --git a/test/iptables/runner/BUILD b/test/iptables/runner/BUILD
index c6c42d870..a5b6f082c 100644
--- a/test/iptables/runner/BUILD
+++ b/test/iptables/runner/BUILD
@@ -10,6 +10,7 @@ container_image(
 
 go_image(
     name = "runner",
+    testonly = 1,
     srcs = ["main.go"],
     base = ":iptables-base",
     deps = ["//test/iptables"],
-- 
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