public PhysicalAddress Resolve(IPAddress destIP)
{
var request = BuildRequest(destIP, LocalMAC, LocalIP);
String arpFilter = "arp and ether dst " + LocalMAC.ToString();
_device.Open(DeviceMode.Promiscuous, 20);
_device.Filter = arpFilter;
var lastRequestTime = DateTime.FromBinary(0);
var requestInterval = new TimeSpan(0, 0, 1);
PacketDotNet.ARPPacket arpPacket = null;
var timeoutDateTime = DateTime.Now + timeout;
while (DateTime.Now < timeoutDateTime)
{
if (requestInterval < (DateTime.Now - lastRequestTime))
{
_device.SendPacket(request);
lastRequestTime = DateTime.Now;
}
var reply = _device.GetNextPacket();
if (reply == null)
{
continue;
}
var packet = PacketDotNet.Packet.ParsePacket(reply.LinkLayerType, reply.Data);
arpPacket = PacketDotNet.ARPPacket.GetEncapsulated(packet);
if (arpPacket == null)
{
continue;
}
if (arpPacket.SenderProtocolAddress.Equals(destIP))
{
break;
}
}
_device.Close();
if (DateTime.Now >= timeoutDateTime)
{
return(null);
}
else
{
return(arpPacket.SenderHardwareAddress);
}
}
public void ScanLAN(IP startIP, IP endIP)
{
var targetIPList = new List <IPAddress>();
while (!startIP.Equals(endIP))
{
targetIPList.Add(startIP.IPAddress);
startIP.AddOne();
}
var arpPackets = new Packet[targetIPList.Count];
for (int i = 0; i < arpPackets.Length; ++i)
{
arpPackets[i] = BuildRequest(targetIPList[i], LocalMAC, LocalIP);
}
String arpFilter = "arp and ether dst " + LocalMAC.ToString();
_device.Open(DeviceMode.Promiscuous, 20);
_device.Filter = arpFilter;
scanThread = new System.Threading.Thread(() =>
{
for (int i = 0; i < arpPackets.Length; ++i)
{
var lastRequestTime = DateTime.FromBinary(0);
var requestInterval = new TimeSpan(0, 0, 1);
var timeoutDateTime = DateTime.Now + timeout;
while (DateTime.Now < timeoutDateTime)
{
if (requestInterval < (DateTime.Now - lastRequestTime))
{
_device.SendPacket(arpPackets[i]);
lastRequestTime = DateTime.Now;
}
var reply = _device.GetNextPacket();
if (reply == null)
{
continue;
}
var packet = PacketDotNet.Packet.ParsePacket(reply.LinkLayerType, reply.Data);
var arpPacket = PacketDotNet.ARPPacket.GetEncapsulated(packet);
if (arpPacket == null)
{
continue;
}
if (arpPacket.SenderProtocolAddress.Equals(targetIPList[i]))
{
if (ResolvedEvent != null)
{
ResolvedEvent(this, new ResolvedEventArgs()
{
IPAddress = arpPacket.SenderProtocolAddress,
PhysicalAddress = arpPacket.SenderHardwareAddress
});
}
break;
}
}
}
_device.Close();
Console.WriteLine("exit scan");
if (ScanStopedEvent != null)
{
ScanStopedEvent(this, new EventArgs());
}
});
scanThread.Start();
}
/// <summary>
/// 获取网关IP
/// </summary>
/// <param name="destIP"></param>
/// <returns></returns>
public PhysicalAddress Resolve(IPAddress destIP)
{
//构造ARP请求包
//var request = getSenderPacket(IPTOBYTE(LocalIP.ToString()), IPTOBYTE(destIP.ToString()),MACTOBYTE( LocalMAC.ToString()));
var request = BuildRequest(destIP, LocalMAC, LocalIP);
//创建一个只允许读取ARP回复的“TCPDUMP”过滤器
String arpFilter = "arp and ether dst " + LocalMAC.ToString();
//打开设备设置20ms的超时
_device.Open(DeviceMode.Promiscuous, 20);
//设置过滤器
_device.Filter = arpFilter;
// set a last request time that will trigger sending the
// arp request immediately
var lastRequestTime = DateTime.FromBinary(0);
var requestInterval = new TimeSpan(0, 0, 1);
PacketDotNet.ARPPacket arpPacket = null;
// 尝试用当前超时解析地址
var timeoutDateTime = DateTime.Now + timeout;
while (DateTime.Now < timeoutDateTime)
{
if (requestInterval < (DateTime.Now - lastRequestTime))
{
// inject the packet to the wire
_device.SendPacket(request);
lastRequestTime = DateTime.Now;
}
//read the next packet from the network
var reply = _device.GetNextPacket();
if (reply == null)
{
continue;
}
// parse the packet
var packet = Packet.ParsePacket(reply.LinkLayerType, reply.Data);
// is this an arp packet?
arpPacket = ARPPacket.GetEncapsulated(packet);
if (arpPacket == null)
{
continue;
}
//if this is the reply we're looking for, stop
if (arpPacket.SenderProtocolAddress.Equals(destIP))
{
break;
}
}
// free the device
_device.Close();
// the timeout happened
if (DateTime.Now >= timeoutDateTime)
{
return(null);
}
else
{
//return the resolved MAC address
return(arpPacket.SenderHardwareAddress);
}
}