//发送ARP广播，返回192.168局域网中其他计算机的ARP相应数据包
public static ArrayList ARPBroadcast(LivePcapDevice device)
{
ArrayList tmpArrayList = new ArrayList();
PhysicalAddress localMAC = device.Interface.MacAddress;
//这是我们伪造的一个IP
IPAddress srcIP = IPAddress.Parse("192.168.3.3");
String arpFilter = "arp and ether dst " + localMAC.ToString();
//open the device with 20ms timeout
device.Open(DeviceMode.Normal, 20);
device.Filter = arpFilter;
IPAddress destIP;
SharpPcap.ARP tmpArp=new ARP();
//发送65535个数据包耗时30秒，这30秒内到达的数据包由网卡缓存
for (int i = 0; i < 256; i++)
{
for (int j = 0; j < 256; j++)
{
destIP = IPAddress.Parse("192.168." + i.ToString() + "." + j.ToString());
//request是Packet类型
var request = tmpArp.BuildRequest(destIP, localMAC, srcIP);
//发送数据包到网络中
device.SendPacket(request);
}
}
DateTime StartTime = DateTime.Now;
DateTime endTime = StartTime.AddSeconds(5);
PacketDotNet.ARPPacket arpPacket = null;
//接收5秒钟数据包，然后闪人
while (DateTime.Now <= endTime)
{
var reply = device.GetNextPacket();
if (reply == null)
continue;
var packet = PacketDotNet.Packet.ParsePacket(reply);
arpPacket = PacketDotNet.ARPPacket.GetEncapsulated(packet);
if (arpPacket == null)
{
continue;
}
else
{
//exists判断是否ARP回应包存在重复
bool exists = false;
foreach (Object obj in tmpArrayList)
{
ARPPacket tmp=(ARPPacket)obj;
if (arpPacket.SenderHardwareAddress==tmp.SenderHardwareAddress)
{
exists = true;
break;
}
}
if (exists == false)
{
tmpArrayList.Add(arpPacket);
}
}
}
device.Close();
return tmpArrayList;
}
