func main() {
ifce, err := water.NewTAP("tap0")
fmt.Printf("%v, %v\n\n", err, ifce)
buffer := make([]byte, BUFFERSIZE)
for {
_, err = ifce.Read(buffer)
if err != nil {
fmt.Printf("err = %v\n", err)
break
}
ethertype := waterutil.MACEthertype(buffer)
fmt.Printf("ethertype = %#v\n", ethertype)
if ethertype == waterutil.IPv4 {
packet := waterutil.MACPayload(buffer)
if waterutil.IsIPv4(packet) {
fmt.Printf("IPv4 Source: %v [%v]\n", waterutil.MACSource(buffer), waterutil.IPv4Source(packet))
fmt.Printf("IPv4 Destination: %v [%v]\n", waterutil.MACDestination(buffer), waterutil.IPv4Destination(packet))
fmt.Printf("IPv4 Protocol: %v\n\n", waterutil.IPv4Protocol(packet))
} else if waterutil.IsIPv6(packet) {
fmt.Printf("IPv6 Source: %v\n", waterutil.MACSource(buffer))
fmt.Printf("IPv6 Destination: %v\n\n", waterutil.MACDestination(buffer))
} else {
fmt.Printf("unknow Source: %v\n", waterutil.MACSource(buffer))
fmt.Printf("unknow Destination: %v\n\n", waterutil.MACDestination(buffer))
}
}
}
}
func TestBroadcast(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 := NewTAP("test")
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")
}
}
}