fix darwin tests

ipv4_windows_test.go

@@ -7,6 +7,9 @@ import (
 	"os/exec"
 	"strings"
 	"testing"
+	"time"
+
+	"github.com/songgao/water/waterutil"
 )
 
 func startBroadcast(t *testing.T, dst net.IP) {
@@ -26,3 +29,55 @@ func setupIfce(t *testing.T, ipNet net.IPNet, dev string) {
 		t.Fatal(err)
 	}
 }
+
+func TestBroadcastTAP(t *testing.T) {
+	var (
+		self = net.IPv4(10, 0, 42, 1)
+		mask = net.IPv4Mask(255, 255, 255, 0)
+		brd  = net.IPv4(10, 0, 42, 255)
+	)
+
+	ifce, err := New(Config{DeviceType: TAP})
+	if err != nil {
+		t.Fatalf("creating TAP error: %v\n", err)
+	}
+
+	setupIfce(t, net.IPNet{IP: self, Mask: mask}, ifce.Name())
+	startBroadcast(t, brd)
+
+	dataCh := make(chan []byte, 8)
+	startRead(dataCh, ifce)
+
+	timeout := time.NewTimer(8 * time.Second).C
+
+readFrame:
+	for {
+		select {
+		case buffer := <-dataCh:
+			ethertype := waterutil.MACEthertype(buffer)
+			if ethertype != waterutil.IPv4 {
+				continue readFrame
+			}
+			if !waterutil.IsBroadcast(waterutil.MACDestination(buffer)) {
+				continue readFrame
+			}
+			packet := waterutil.MACPayload(buffer)
+			if !waterutil.IsIPv4(packet) {
+				continue readFrame
+			}
+			if !waterutil.IPv4Source(packet).Equal(self) {
+				continue readFrame
+			}
+			if !waterutil.IPv4Destination(packet).Equal(brd) {
+				continue readFrame
+			}
+			if waterutil.IPv4Protocol(packet) != waterutil.ICMP {
+				continue readFrame
+			}
+			t.Logf("received broadcast frame: %#v\n", buffer)
+			break readFrame
+		case <-timeout:
+			t.Fatal("Waiting for broadcast packet timeout")
+		}
+	}
+}