private void OnPacketArrval(object sender, CaptureEventArgs e)
{
Packet packet = null;
try
{
packet = Packet.ParsePacket(e.Packet.LinkLayerType, e.Packet.Data);
}
catch
{
return;
}
IPAddress source = IPAddress.Parse("127.0.0.1");
IPAddress destination = IPAddress.Parse("127.0.0.1");
string type = GetTopProtocolType(packet, ref source, ref destination);
Thread thread = new Thread(() =>
{
string info = string.Format("time:{0}:{1}:{2}/{5} {3} -> {4} type:{6} size:{7}B\n", DateTime.Now.Hour,
DateTime.Now.Minute, DateTime.Now.Second, source, destination, DateTime.Now.Millisecond, type, e.Packet.Data.Length);
OnAppendPacketInfo(info);
lock (packets)
{
ListViewItem item = new ListViewItem(packets.Count.ToString());
item.SubItems.AddRange(new string[] { source.ToString(), destination.ToString(), e.Packet.Data.Length.ToString(), type });
OnAddListviewItem(item);
packets.Add(packet);
}
});
thread.IsBackground = true;
thread.Start();
if (e.Packet.LinkLayerType == LinkLayers.Ethernet)
{
try
{
EthernetPacket eth = (EthernetPacket)EthernetPacket.ParsePacket(e.Packet.LinkLayerType, e.Packet.Data);
if (eth.PayloadPacket is ARPPacket)
{
ARPPacket arp = (ARPPacket)eth.PayloadPacket;
if (arp.Operation == ARPOperation.Response || arp.Operation == ARPOperation.Request)
{
if (!macAddress.ContainsKey(arp.SenderProtocolAddress))
{
macAddress.Add(arp.SenderProtocolAddress, arp.SenderHardwareAddress);
}
}
}
else if (eth.PayloadPacket is IPv4Packet)
{
IPv4Packet ip = (IPv4Packet)eth.PayloadPacket;
if (hadHandledIpList.Contains(ip.Id))
{
return;
}
hadHandledIpList.Add(ip.Id);
bool hadSent = false;
#region 直连路由包
foreach (Device dev in deviceList)
{
if (dev.Interface == e.Device)
{
continue;
}
if (GetNetIpAddress(ip.DestinationAddress, dev.MaskAddress).ToString() == dev.NetAddress.ToString())
{
eth.SourceHwAddress = dev.MacAddress;
if (!macAddress.ContainsKey(ip.DestinationAddress))
{
MacAddress.GetMacAddress(ip.DestinationAddress);
return;
}
else
{
eth.DestinationHwAddress = macAddress[ip.DestinationAddress];
}
dev.Interface.SendPacket(eth);
hadSent = true;
}
}
if (hadSent)
{
return;
}
#endregion
#region 非直连路由包
RouteTable route = staticRouting[ip.DestinationAddress];
if (route != null)
{
eth.SourceHwAddress = route.OutInterface.MacAddress;
if (!macAddress.ContainsKey(route.NextHop))
{
MacAddress.GetMacAddress(route.NextHop);
return;
}
else
{
eth.DestinationHwAddress = macAddress[route.NextHop];
}
route.OutInterface.SendPacket(eth);
return;
}
#endregion
}
else if (eth.PayloadPacket is PPPoEPacket)
{
//暂不处理
}
}
catch
{
//Protocol of 49185 is not implemented
//不支持此协议,对此类协议包进行忽略
return;
}
}
}
private void button1_Click(object sender, EventArgs e)
{
//ICMP
if (comboBox1.SelectedIndex == 4)
{
byte[] buffer = new byte[32];
ICMPv4Packet icmp = new ICMPv4Packet(new PacketDotNet.Utils.ByteArraySegment(buffer));
icmp.TypeCode = ICMPv4TypeCodes.EchoRequest;
icmp.ID = (ushort)0;
icmp.Sequence = (ushort)0;
icmp.PayloadData = new byte[32];
icmp.Checksum = GetChecksum(icmp.Header);
IPAddress sourceIP = IPAddress.Parse(ipAddressBox1.Text);
IPAddress destinationIP = IPAddress.Parse(ipAddressBox2.Text);
IPv4Packet ipv4 = new IPv4Packet(sourceIP, destinationIP);
ipv4.PayloadPacket = icmp;
ipv4.TimeToLive = 128;
ipv4.Checksum = GetChecksum(ipv4.Header);
if (!softRoute.macAddress.ContainsKey(sourceIP))
{
MacAddress.GetMacAddress(sourceIP);
MessageBox.Show("源MAC不存在，获取中，请稍候再试！", "提示");
return;
}
PhysicalAddress sourceMac = softRoute.macAddress[sourceIP];
if (!softRoute.macAddress.ContainsKey(destinationIP))
{
MacAddress.GetMacAddress(destinationIP);
MessageBox.Show("目的MAC不存在，获取中，请稍候再试！", "提示");
return;
}
PhysicalAddress destinationMac = softRoute.macAddress[destinationIP];
EthernetPacket eth = new EthernetPacket(sourceMac, destinationMac, EthernetPacketType.IpV4);
eth.PayloadPacket = ipv4;
softRoute.deviceList[comboBox2.SelectedIndex].Interface.SendPacket(eth);
}
//ARP
else if (comboBox1.SelectedIndex == 0)
{
ARPPacket arp = new ARPPacket(ARPOperation.Request, PhysicalAddress.Parse(textBox2.Text), IPAddress.Parse(ipAddressBox2.Text),
PhysicalAddress.Parse(textBox1.Text), IPAddress.Parse(ipAddressBox1.Text));
EthernetPacket eth = new EthernetPacket(PhysicalAddress.Parse(textBox1.Text), PhysicalAddress.Parse(textBox2.Text), EthernetPacketType.Arp);
eth.PayloadPacket = arp;
softRoute.deviceList[comboBox2.SelectedIndex].Interface.SendPacket(eth);
}
//IP
else if (comboBox1.SelectedIndex == 1)
{
//IPv4Packet ipv4 = new IPv4Packet(IPAddress.Parse(ipAddressBox1.Text), IPAddress.Parse(ipAddressBox2.Text));
}
//TCP
else if (comboBox1.SelectedIndex == 2)
{
//TcpPacket tcp = new TcpPacket(1, 2);
}
//UDP
else if (comboBox1.SelectedIndex == 3)
{
}
}