add test for reproducing golang/go#14210 (Go 1.6 panic: runtime error: cgo argument has Go pointer to Go pointer)

Author: AkihiroSuda

.travis.yml

@@ -1,6 +1,8 @@
 language: go
 
 go:
+  - tip
+  - 1.6
   - 1.5
 
 before_install:

netfilter.go

@@ -32,9 +32,9 @@ package netfilter
 import "C"
 
 import (
+	"fmt"
 	"github.com/google/gopacket"
 	"github.com/google/gopacket/layers"
-	"fmt"
 	"unsafe"
 )
 

netfilter_test.go

@@ -0,0 +1,39 @@
+package netfilter
+
+import (
+	"testing"
+	"time"
+)
+
+var stopCh = make(chan struct{})
+
+func serve(t *testing.T, queueNum uint16) {
+	nfq, err := NewNFQueue(queueNum, 100, NF_DEFAULT_PACKET_SIZE)
+	if err != nil {
+		t.Skipf("Skipping the test due to %s", err)
+	}
+	defer nfq.Close()
+	packets := nfq.GetPackets()
+
+	t.Logf("Starting (NFQ %d)..", queueNum)
+	for true {
+		select {
+		case p := <-packets:
+			t.Logf("Accepting %s", p.Packet)
+			p.SetVerdict(NF_ACCEPT)
+		case <-stopCh:
+			t.Logf("Exiting..")
+			return
+		}
+	}
+}
+
+// very dumb test, but enough for testing golang/go#14210
+func TestNetfilter(t *testing.T) {
+	queueNum := 42
+	go serve(t, uint16(queueNum))
+	wait := 3 * time.Second
+	t.Logf("Sleeping for %s", wait)
+	time.Sleep(wait)
+	close(stopCh)
+}