/// <summary>
/// Extracts data from provided packet
/// </summary>
/// <param name="packet">Packet to extract data from</param>
/// <returns>Returns new Packet object with extracted layers</returns>
public INewPacket GetPacketByProtocol(IpV4Protocol protocol)
{
return(_packetFactory.GetPacketByProtocol(protocol));
}
/// <summary>
/// Intercepts and forwards packets to web
/// </summary>
public void InterceptAndForwardPackets(UserInputData userInput)
{
INewPacket packetToCopyFrom = default;
bool isAutoModifyPackets = false;
bool isFilterEnabled = false;
int packetCountGoneThroughDevice = 0;
int selectedOutputDevice = LetUserChooseInterfaceBeforeWorkingWithPackets();
PacketDevice device = _allDevices[selectedOutputDevice - 1]; // - 1 because of array
using (PacketCommunicator inputCommunicator = device.Open(65535, PacketDeviceOpenAttributes.Promiscuous, 1000))
{
if (inputCommunicator.DataLink.Kind != DataLinkKind.Ethernet)
{
_userExperience.UserTextDisplayer.PrintTextAndExit("Only ethernet networks are supported");
}
using (PacketCommunicator outputCommunicator = device.Open(65535, PacketDeviceOpenAttributes.Promiscuous, 1000))
{
if (!string.IsNullOrWhiteSpace(userInput.PacketFilterProtocol))
{
inputCommunicator.SetFilter(userInput.PacketFilterProtocol.ToLower());
outputCommunicator.SetFilter(userInput.PacketFilterProtocol.ToLower());
isFilterEnabled = true;
}
while (inputCommunicator.ReceivePacket(out Packet packet) != PacketCommunicatorReceiveResult.Eof)
{
if (packet == null)
{
continue;
}
if (packetCountGoneThroughDevice > 10) // for hint to be seen always, and not to cause too much mess in console
{
_userExperience.UserTextDisplayer.ClearConsole();
_userExperience.UserTextDisplayer.PrintText("-M to modify one packet");
_userExperience.UserTextDisplayer.PrintText("-A to automatically modify packets");
_userExperience.UserTextDisplayer.PrintText("-P to pause");
packetCountGoneThroughDevice = 0;
}
_userExperience.UserTextDisplayer.ShowPacketBaseInfo(packet);
if (Console.KeyAvailable) // if user pressed key, then does manipulation with packets
{
ConsoleKeyInfo choice = Console.ReadKey(true);
switch (choice.Key)
{
case ConsoleKey.A: // modify every packet using user saved settings if filter is enabled
if (isFilterEnabled)
{
packetToCopyFrom = GetPacketFilledWithUserValuesToCopyFrom(packet.Ethernet.IpV4.Protocol, userInput.IsSendPacket);
isAutoModifyPackets = (packetToCopyFrom != null);
}
else
{
_userExperience.UserTextDisplayer.PrintText("NOTE: You can't automodify packets without protocol filtering");
}
break;
case ConsoleKey.M: // modify one packet in normal way
packet = _packetFactory.GetPacketByProtocol(packet.Ethernet.IpV4.Protocol).ModifyLayers().BuildPacket(true, 0);
break;
case ConsoleKey.P:
_userExperience.UserTextDisplayer.PrintText("PAUSED");
_userExperience.UserInputHandler.WaitForUserToPressKey();
break;
}
}
if (isAutoModifyPackets)
{
Packet autoModifiedPacket = AutoModifyPacket(packet, packetToCopyFrom);
if (autoModifiedPacket != null)
{
packet = autoModifiedPacket;
}
}
if (userInput.IsUserWantsToSavePacket)
{
_fileHandler.TrySaveOnePacketToDisk(packet);
}
if (userInput.IsSendPacket)
{
outputCommunicator.SendPacket(packet);
}
packetCountGoneThroughDevice++;
}
}
}
}
