private void SendIcmpReplyPacket(Packet request)
{
var icmp = request.Ethernet.IpV4.Icmp as IcmpEchoDatagram;
OSI.Layer3Packet packet = new OSI.Layer3Packet();
packet.Destination = request.Ethernet.IpV4.Source.ToString();
packet.SourceIP = _client.Configuration.IpAddress;
packet.Ttl = (byte)(request.Ethernet.IpV4.Ttl / 2);
var data = icmp.ToArray();
data = data.Subsegment(8, data.Length - 8).ToArray();
PcapDotNet.Packets.Icmp.IcmpEchoReplyLayer icmpLayer =
new PcapDotNet.Packets.Icmp.IcmpEchoReplyLayer
{
Checksum = null,
Identifier = icmp.Identifier,
SequenceNumber = (ushort)(icmp.SequenceNumber),
};
PcapDotNet.Packets.PayloadLayer extra = new PcapDotNet.Packets.PayloadLayer()
{
Data = new PcapDotNet.Packets.Datagram(data)
};
packet.NextLayers.Add(icmpLayer);
packet.NextLayers.Add(extra);
SendPacket(packet);
}
public void SendLayer3Packet(OSI.Layer3Packet packet, PacketSentHandler callback)
{
IpV4Layer ipV4Layer = new IpV4Layer
{
Source = new IpV4Address(packet.SourceIP.AsString),
Ttl = packet.Ttl,
// The rest of the important parameters will be set for each packet
};
Common.IPv4Address ip = null;
try
{
System.Net.IPAddress.Parse(packet.Destination);
ip = new Common.IPv4Address(packet.Destination);
}
catch
{
ip = Dns.ResolveHost(packet.Destination).IPs[0];
}
ipV4Layer.CurrentDestination = new IpV4Address(ip.AsString);
OSI.Layer2Packet l2 = new OSI.Layer2Packet();
l2.SourceMac = Configuration.MacAddress;
l2.DestinationMac = Arp.ResolveIP(ip);
foreach (ILayer layer in packet.NextLayers)
{
l2.NextLayers.Add(layer);
}
l2.NextLayers.Insert(0, ipV4Layer);
SendLayer2Packet(l2, callback);
}
private void SendTcpPacket(OSI.Layer4TcpPacket packet, PacketSentHandler callback)
{
TcpLayer tcpLayer =
new TcpLayer
{
SourcePort = packet.LocalPort,
DestinationPort = packet.RemotePort,
Checksum = null, // Will be filled automatically.
SequenceNumber = packet.SequenceNumber,
AcknowledgmentNumber = packet.AcknowledgementNumber,
Window = 64512,
};
if (packet.ACK)
{
tcpLayer.ControlBits = tcpLayer.ControlBits | TcpControlBits.Acknowledgment;
}
if (packet.SYN)
{
tcpLayer.ControlBits = tcpLayer.ControlBits | TcpControlBits.Synchronize;
}
if (packet.RST)
{
tcpLayer.ControlBits = tcpLayer.ControlBits | TcpControlBits.Reset;
}
if (packet.PSH)
{
tcpLayer.ControlBits = tcpLayer.ControlBits | TcpControlBits.Push;
}
if (packet.FIN)
{
tcpLayer.ControlBits = tcpLayer.ControlBits | TcpControlBits.Fin;
}
OSI.Layer3Packet l3 = new OSI.Layer3Packet();
l3.Ttl = 255;
l3.SourceIP = Configuration.IpAddress;
l3.Destination = packet.Destination;
foreach (ILayer layer in packet.NextLayers)
{
l3.NextLayers.Add(layer);
}
l3.NextLayers.Insert(0, tcpLayer);
SendLayer3Packet(l3, callback);
}
private void SendUdpPacket(OSI.Layer4UdpPacket packet, PacketSentHandler callback)
{
UdpLayer udpLayer =
new UdpLayer
{
SourcePort = packet.LocalPort,
DestinationPort = packet.RemotePort,
Checksum = null, // Will be filled automatically.
CalculateChecksumValue = true,
};
OSI.Layer3Packet l3 = new OSI.Layer3Packet();
l3.Ttl = 255;
l3.SourceIP = Configuration.IpAddress;
l3.Destination = packet.Destination;
foreach (ILayer layer in packet.NextLayers)
{
l3.NextLayers.Add(layer);
}
l3.NextLayers.Insert(0, udpLayer);
SendLayer3Packet(l3, callback);
}
private void SendIcmpRequestPacket(Common.IPv4Address ip, byte ttl, ushort bytes, int seqNum, int timeout, PingResultHandler callback)
{
OSI.Layer3Packet packet = new OSI.Layer3Packet();
packet.Destination = ip.AsString;
packet.SourceIP = _client.Configuration.IpAddress;
packet.Ttl = ttl;
var data = new byte[bytes];
_random.NextBytes(data);
var shor = new byte[2];
_random.NextBytes(shor);
ushort id = BitConverter.ToUInt16(shor, 0);
// Save ping
if (CurrentPings.ContainsKey(id))
{
CurrentPings[id] = new PingRequest(callback);
}
else
{
PingRequest req = new PingRequest(callback);
req.Bytes = bytes;
CurrentPings.Add(id, req);
}
PcapDotNet.Packets.Icmp.IcmpEchoLayer icmpLayer =
new PcapDotNet.Packets.Icmp.IcmpEchoLayer
{
Checksum = null,
Identifier = id,
SequenceNumber = (ushort)(seqNum),
};
PcapDotNet.Packets.PayloadLayer extra = new PcapDotNet.Packets.PayloadLayer()
{
Data = new PcapDotNet.Packets.Datagram(data)
};
packet.NextLayers.Add(icmpLayer);
packet.NextLayers.Add(extra);
SendPacket(packet, () =>
{
CurrentPings[id].TimeStamp = DateTime.Now;
});
DateTime now = DateTime.Now;
while ((DateTime.Now - now).TotalMilliseconds < timeout)
{
if (CurrentPings[id].ReplyReceived)
{
break;
}
System.Threading.Thread.Sleep(100);
}
if (!CurrentPings[id].ReplyReceived)
{
CurrentPings[id].Callback(new PingResult(PingResultType.RequestTimedOut));
}
CurrentPings.Remove(id);
}
