private static IPAddress[] GetLocalAddresses()
{
IPHostEntry hostAddress = null;
// Get all addresses assocatied with this computer
try
{
hostAddress = Dns.GetHostEntry(Dns.GetHostName());
}
catch (Exception e)
{
ConsoleDisplay.Error($"Could not fetch local addresses ({e.GetType().ToString().Split('.').Last()})");
}
// Only get IPv4 address
List <IPAddress> addresses = new List <IPAddress>();
foreach (IPAddress address in hostAddress.AddressList)
{
if (address.AddressFamily == AddressFamily.InterNetwork)
{
addresses.Add(address);
}
}
return(addresses.ToArray());
}
/// <summary>
/// Prints and error message and then exits with exit code 1
/// </summary>
/// <param name="msg">Error message to print</param>
/// <param name="pause">Wait for user input before exitingt</param>
public static void ErrorAndExit(string msg)
{
ConsoleDisplay.Error(msg);
if (RequireInput)
{
Helper.WaitForUserInput();
}
Environment.Exit(1);
}
public static void ListenForICMPOnAddress(IPAddress address)
{
Socket listeningSocket = null;
PingResults results = new PingResults();
int bufferSize = 4096;
// Create listener socket
try
{
listeningSocket = new Socket(AddressFamily.InterNetwork, SocketType.Raw, ProtocolType.Icmp);
listeningSocket.Bind(new IPEndPoint(address, 0));
listeningSocket.IOControl(IOControlCode.ReceiveAll, new byte[] { 1, 0, 0, 0 }, new byte[] { 1, 0, 0, 0 }); // Set SIO_RCVALL flag to socket IO control
listeningSocket.ReceiveBufferSize = bufferSize;
}
catch (Exception e)
{
ConsoleDisplay.Error($"Exception occured while trying to create listening socket for {address.ToString()} ({e.GetType().ToString().Split('.').Last()})");
return;
}
ConsoleDisplay.ListenIntroMsg(address.ToString());
// Listening loop
while (true)
{
byte[] buffer = new byte[bufferSize];
try
{
// 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
ConsoleDisplay.CapturedPacket(address.ToString(), response, remoteEndPoint.ToString(), DateTime.Now.ToString("h:mm:ss.ff tt"), bytesRead);
// Store results
results.CountPacketType(response.Type);
results.IncrementReceivedPackets();
}
catch (OperationCanceledException)
{
}
catch (SocketException)
{
ConsoleDisplay.Error("Could not read packet from socket");
}
}
listeningSocket.Close();
}
public void Append(string line)
{
if (_fileStream != null && _fileStream.CanWrite)
{
_fileStream.Write(_asciiEncoder.GetBytes(line + Environment.NewLine));
try
{
_fileStream.Flush();
}
catch (Exception ex)
{
ConsoleDisplay.Error($"Error writing to log file ({_filePath})", ex);
}
}
}
public void Create(string filePath)
{
string?path = "";
try
{
if (filePath.Contains(Path.DirectorySeparatorChar))
{
// Check the directory we want to write to exits
path = Path.GetDirectoryName(filePath);
if (path != null && !Directory.Exists(path))
{
Directory.CreateDirectory(path);
}
}
}
catch (Exception e)
{
ConsoleDisplay.Error($"Cannot create file at {path} changing to {Directory.GetCurrentDirectory()}", e);
// Change file to be written to current directory
// when we can't create our first directory choice
filePath = Path.Combine(Directory.GetCurrentDirectory(), Path.GetFileName(filePath));
}
try
{
// Create the file
_fileStream = File.Create(filePath);
}
catch (Exception ex)
{
ConsoleDisplay.Error($"Cannot write to log file ({filePath})", ex);
_fileStream = null;
}
}