private void RequestCallback(IAsyncResult ar)
{
try
{
IPEndPoint receivedIpEndPoint = new IPEndPoint(IPAddress.Any, 0);
if (udpc.Client == null)
{
return;
}
byte[] receiveBytes = udpc.EndReceive(ar, ref receivedIpEndPoint);
UdpPacketArgs upa = new UdpPacketArgs
{
UdpPacket = receiveBytes
};
OnUDPPacket?.Invoke(this, upa);
// Restart listening for udp data
udpc.BeginReceive(RequestCallback, null);
}
catch (Exception ex)
{
Debug.WriteLine(ex.Message);
}
}
public void Packet(byte[] datagram, NetworkInterface a)
{
try
{
OnRecievedPacket.Invoke(datagram, a);
}
catch
{
}
IPv4Header Data;
try
{
Data = new IPv4Header(datagram);
}
catch (Exception e)
{
OnCorruptPacket.BeginInvoke(datagram, a, null, null);
return;
}
if (a.LocalIP != null)
{
if (Data.DestinationAddress == a.LocalIP)
{
}
else if (a.SubnetMask != null)
{
if ((Data.DestinationAddress & ~a.SubnetMask) == (a.LocalIP & ~a.SubnetMask))
{
OnNotForMe?.Invoke(Data, a);
return;
}
}
}
switch (Data.Protocol)
{
case IPv4Header.ProtocolType.ICMP:
handleICMPPacket(Data, a);
break;
case IPv4Header.ProtocolType.TCP:
TCPHeader TCP;
try
{
TCP = new TCPHeader(Data.Datagram);
}
catch (Exception e)
{
OnCorruptPacket?.Invoke(datagram, a);
break;
}
OnTCPPacket?.Invoke(Data, TCP, TCP.DestinationPort, a);
break;
case IPv4Header.ProtocolType.UDP:
UDPHeader UDP;
try
{
UDP = new UDPHeader(Data.Datagram);
}
catch (Exception e)
{
OnCorruptPacket?.Invoke(datagram, a);
break;
}
OnUDPPacket?.Invoke(Data, UDP, UDP.DestinationPort, a);
break;
default:
break;
}
}
