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 SendPacket(Packet pack, PacketSentHandler callback)
{
if (NetworkFirewall.TestOutgoing(new Common.PacketData(pack)))
{
Communicator.SendPacket(pack);
callback();
}
}
public void SendLayer4Packet(OSI.Layer4Packet packet, PacketSentHandler callback)
{
switch (packet.Protocol)
{
case OSI.TransportProtocol.TCP:
SendTcpPacket(packet as OSI.Layer4TcpPacket, callback);
break;
case OSI.TransportProtocol.UDP:
SendUdpPacket(packet as OSI.Layer4UdpPacket, callback);
break;
}
}
public void SendLayer2Packet(OSI.Layer2Packet packet, PacketSentHandler callback)
{
EthernetLayer ethernetLayer =
new EthernetLayer
{
Source = new MacAddress(packet.SourceMac.AsString),
Destination = new MacAddress(packet.DestinationMac.AsString),
EtherType = EthernetType.None, // Will be filled automatically.
};
List <ILayer> layers = new List <ILayer>(packet.NextLayers);
layers.Insert(0, ethernetLayer);
Packet pack = PacketBuilder.Build(DateTime.Now, layers.ToArray());
SendPacket(pack, 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);
}
