Ejemplo n.º 1
0
func main() {
	log.SetFlags(0)

	usage := `Usage: arp <addr>

Resolve the given IP address using ARP.`

	args, err := docopt.Parse(usage, nil, true, "", false)
	if err != nil {
		log.Fatalf("Invalid arguments: %s", err)
	}

	addr := args["<addr>"].(string)
	addr_ip := net.ParseIP(addr)
	timeout := 5 * time.Second

	route, err := routing.RouteTo(addr_ip)
	if err != nil {
		log.Fatalf("Error: %s", err)
	}

	if route == nil {
		log.Println("No route found")
	}

	c, err := pcap.Open(route.Iface.Name)
	if err != nil {
		log.Fatalf("Error opening interface: %s", err)
	}
	defer c.Close()

	err = c.Activate()
	if err != nil {
		log.Fatalf("Error activating source: %s", err)
	}

	eth_pkt := eth.Make()
	eth_pkt.SrcAddr = route.Iface.HardwareAddr
	eth_pkt.DstAddr, _ = net.ParseMAC("ff:ff:ff:ff:ff:ff")

	arp_pkt := arp.Make()
	arp_pkt.HWSrcAddr = route.Iface.HardwareAddr
	arp_pkt.HWDstAddr, _ = net.ParseMAC("00:00:00:00:00:00")
	arp_pkt.ProtoSrcAddr, _ = route.GetIfaceIPv4Addr()
	arp_pkt.ProtoDstAddr = addr_ip

	pkt, err := network.SendRecv(c, timeout, eth_pkt, arp_pkt)
	if err != nil {
		log.Fatal(err)
	}

	log.Println(pkt.Payload().(*arp.Packet).HWSrcAddr)
}
Ejemplo n.º 2
0
func ResolveARP(c capture.Handle, t time.Duration, r *routing.Route, addr net.IP) net.HardwareAddr {
	eth_pkt := eth.Make()
	eth_pkt.SrcAddr = r.Iface.HardwareAddr
	eth_pkt.DstAddr, _ = net.ParseMAC("ff:ff:ff:ff:ff:ff")

	arp_pkt := arp.Make()
	arp_pkt.HWSrcAddr = r.Iface.HardwareAddr
	arp_pkt.HWDstAddr, _ = net.ParseMAC("00:00:00:00:00:00")
	arp_pkt.ProtoSrcAddr, _ = r.GetIfaceIPv4Addr()
	arp_pkt.ProtoDstAddr = addr

	pkt, err := network.SendRecv(c, t, eth_pkt, arp_pkt)
	if err != nil {
		log.Fatal(err)
	}

	return pkt.Payload().(*arp.Packet).HWSrcAddr
}
Ejemplo n.º 3
0
func TestPackEthArp(t *testing.T) {
	eth_pkt := eth.Make()
	eth_pkt.SrcAddr, _ = net.ParseMAC(hwsrc_str)
	eth_pkt.DstAddr, _ = net.ParseMAC("ff:ff:ff:ff:ff:ff")

	arp_pkt := arp.Make()
	arp_pkt.HWSrcAddr, _ = net.ParseMAC(hwsrc_str)
	arp_pkt.HWDstAddr, _ = net.ParseMAC("00:00:00:00:00:00")
	arp_pkt.ProtoSrcAddr = net.ParseIP(ipsrc_str)
	arp_pkt.ProtoDstAddr = net.ParseIP(ipdst_str)

	buf, err := layers.Pack(eth_pkt, arp_pkt)
	if err != nil {
		t.Fatalf("Error packing: %s", err)
	}

	if !bytes.Equal(test_eth_arp, buf) {
		t.Fatalf("Raw packet mismatch: %x", buf)
	}
}
Ejemplo n.º 4
0
func ExamplePack() {
	// Create an Ethernet packet
	eth_pkt := eth.Make()
	eth_pkt.SrcAddr, _ = net.ParseMAC("4c:72:b9:54:e5:3d")
	eth_pkt.DstAddr, _ = net.ParseMAC("ff:ff:ff:ff:ff:ff")

	// Create an ARP packet
	arp_pkt := arp.Make()
	arp_pkt.HWSrcAddr, _ = net.ParseMAC("4c:72:b9:54:e5:3d")
	arp_pkt.HWDstAddr, _ = net.ParseMAC("00:00:00:00:00:00")
	arp_pkt.ProtoSrcAddr = net.ParseIP("192.168.1.135")
	arp_pkt.ProtoDstAddr = net.ParseIP("192.168.1.254")

	buf, err := layers.Pack(eth_pkt, arp_pkt)
	if err != nil {
		log.Fatal(err)
	}

	// do something with the packet
	log.Println(buf)
}