Ejemplo n.º 1
0
        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);
            }
        }
Ejemplo n.º 2
0
        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;
            }
        }