/// <summary>
/// Listens for all ICMPv4 activity on localhost.
///
/// Does this by setting a raw socket to SV_IO_ALL which
/// will recieve all packets and filters to just show
/// ICMP packets. Runs until ctrl-c or exit
/// </summary>
/// <source>https://stackoverflow.com/a/9174392</source>
public void Listen()
{
IPAddress localAddress = null;
Socket listeningSocket = null;
PingResults results = new PingResults();
// Find local address
localAddress = IPAddress.Parse(PowerPing.Lookup.LocalAddress());
IsRunning = true;
try {
// Create listener socket
listeningSocket = CreateRawSocket(AddressFamily.InterNetwork);
listeningSocket.Bind(new IPEndPoint(localAddress, 0));
listeningSocket.IOControl(IOControlCode.ReceiveAll, new byte[] { 1, 0, 0, 0 }, new byte[] { 1, 0, 0, 0 }); // Set SIO_RCVALL flag to socket IO control
PowerPing.Display.ListenIntroMsg();
// Listening loop
while (true)
{
byte[] buffer = new byte[4096]; // TODO: could cause overflow?
// Recieve any incoming ICMPv4 packets
EndPoint remoteEndPoint = new IPEndPoint(IPAddress.Any, 0);
int bytesRead = listeningSocket.ReceiveFrom(buffer, ref remoteEndPoint);
ICMP response = new ICMP(buffer, bytesRead);
// Display captured packet
PowerPing.Display.CapturedPacket(response, remoteEndPoint.ToString(), DateTime.Now.ToString("h:mm:ss.ff tt"), bytesRead);
// Store results
results.CountPacketType(response.type);
results.Received++;
if (cancelEvent.WaitOne(0))
{
break;
}
}
} catch (SocketException) {
PowerPing.Display.Error("Could not read packet from socket");
results.Lost++;
} catch (Exception) {
PowerPing.Display.Error("General exception occured", true);
}
// Clean up
IsRunning = false;
listeningSocket.Close();
Display.ListenResults(results);
}
