fix darwin tests

ipv4_darwin_test.go

@@ -0,0 +1,67 @@
+// +build linux darwin
+
+package water
+
+import (
+	"net"
+	"os/exec"
+	"testing"
+	"time"
+
+	"github.com/songgao/water/waterutil"
+)
+
+func startPing(t *testing.T, dst net.IP) {
+	if err := exec.Command("ping", "-c", "2", dst.String()).Start(); err != nil {
+		t.Fatal(err)
+	}
+}
+
+func setupIfce(t *testing.T, self net.IP, remote net.IP, dev string) {
+	if err := exec.Command("ifconfig", dev, "inet", self.String(), remote.String(), "up").Run(); err != nil {
+		t.Fatal(err)
+	}
+}
+
+func TestP2PTUN(t *testing.T) {
+	var (
+		self   = net.IPv4(10, 0, 42, 1)
+		remote = net.IPv4(10, 0, 42, 2)
+	)
+
+	ifce, err := New(Config{DeviceType: TUN})
+	if err != nil {
+		t.Fatalf("creating TUN error: %v\n", err)
+	}
+
+	setupIfce(t, self, remote, ifce.Name())
+	startPing(t, remote)
+
+	dataCh := make(chan []byte, 8)
+	startRead(dataCh, ifce)
+
+	timeout := time.NewTimer(8 * time.Second).C
+
+readFrame:
+	for {
+		select {
+		case packet := <-dataCh:
+			if !waterutil.IsIPv4(packet) {
+				continue readFrame
+			}
+			if !waterutil.IPv4Source(packet).Equal(self) {
+				continue readFrame
+			}
+			if !waterutil.IPv4Destination(packet).Equal(remote) {
+				continue readFrame
+			}
+			if waterutil.IPv4Protocol(packet) != waterutil.ICMP {
+				continue readFrame
+			}
+			t.Logf("received broadcast packet: %#v\n", packet)
+			break readFrame
+		case <-timeout:
+			t.Fatal("Waiting for broadcast packet timeout")
+		}
+	}
+}