using PcapDotNet.Core;
using PcapDotNet.Packets;
using PcapDotNet.Packets.Ethernet;
using PcapDotNet.Packets.IpV4;
using PcapDotNet.Packets.Transport;
using System;
using System.Collections.Generic;
using System.Text;

namespace SendingASinglePacketWithSendPacket
{
    internal class Program
    {
        private static void Main(string[] args)
        {
            // Retrieve the device list from the local machine
            IList<LivePacketDevice> allDevices = LivePacketDevice.AllLocalMachine;

            if (allDevices.Count == 0)
            {
                Console.WriteLine("No interfaces found! Make sure WinPcap is installed.");
                return;
            }

            // Print the list
            for (int i = 0; i != allDevices.Count; ++i)
            {
                LivePacketDevice device = allDevices[i];
                Console.Write(i + 1 + ". " + device.Name);
                if (device.Description != null)
                    Console.WriteLine(" (" + device.Description + ")");
                else
                    Console.WriteLine(" (No description available)");
            }

            int deviceIndex = 0;
            do
            {
                Console.WriteLine("Enter the interface number (1-" + allDevices.Count + "):");
                string deviceIndexString = Console.ReadLine();
                if (!int.TryParse(deviceIndexString, out deviceIndex) ||
                    deviceIndex < 1 || deviceIndex > allDevices.Count)
                {
                    deviceIndex = 0;
                }
            } while (deviceIndex == 0);

            // Take the selected adapter
            PacketDevice selectedDevice = allDevices[deviceIndex - 1];

            // Open the output device
            using (PacketCommunicator communicator = selectedDevice.Open(100, // name of the device
                                                                         PacketDeviceOpenAttributes.Promiscuous, // promiscuous mode
                                                                         1000)) // read timeout
            {
                communicator.SendPacket(BuildUdpPacket());
            }
        }
        private static Packet BuildUdpPacket()
        {
            EthernetLayer ethernetLayer =
                new EthernetLayer
                {
                    Source = new MacAddress("01:01:01:01:01:01"),
                    Destination = new MacAddress("02:02:02:02:02:02"),
                    EtherType = EthernetType.None, // Will be filled automatically.
                };

            IpV4Layer ipV4Layer =
                new IpV4Layer
                {
                    Source = new IpV4Address("1.2.3.4"),
                    CurrentDestination = new IpV4Address("11.22.33.44"),
                    Fragmentation = IpV4Fragmentation.None,
                    HeaderChecksum = null, // Will be filled automatically.
                    Identification = 123,
                    Options = IpV4Options.None,
                    Protocol = null, // Will be filled automatically.
                    Ttl = 100,
                    TypeOfService = 0,
                };

            UdpLayer udpLayer =
                new UdpLayer
                {
                    SourcePort = 4050,
                    DestinationPort = 25,
                    Checksum = null, // Will be filled automatically.
                    CalculateChecksumValue = true,
                };

            PayloadLayer payloadLayer =
                new PayloadLayer
                {
                    Data = new Datagram(Encoding.ASCII.GetBytes("mi she kore et ze homo")),
                };

            PacketBuilder builder = new PacketBuilder(ethernetLayer, ipV4Layer, udpLayer, payloadLayer);

            return builder.Build(DateTime.Now);
        }
    }
}