//choosing file to send >>> Attach button
private void button1_Click(object sender, EventArgs e)
{
if (userToRecieve == "")
{
MessageBox.Show("click on the user you want to send him the file !!!");
return;
}
openFileDialog2.ShowDialog();
foreach (User u in listUsers)
{
if (u.userName == userToRecieve)
{
user.userName = userToRecieve;
user.ip = u.ip;
user.port = u.port;
}
}
ArrayList n = new ArrayList();
IPEndPoint ipep = new IPEndPoint(IPAddress.Parse(user.ip), Int32.Parse(user.port));
n.Add(ipep);
string hmacfile = TheHelperFiles.fileHmac(openFileDialog2.FileName);
userToRecieve = "SENDFILE-" + tbMyIp.Text + "-" + nubPort.Value + "-" + userNameTB.Text + "-" + openFileDialog2.FileName + "-" + hmacfile;
send(userToRecieve, n);
}
public static String recieve(String file, TcpListener listener, string savePath, string sourceHmac)
{
byte[] RecData = new byte[1024];
int RecBytes;
string[] filetosendarray = savePath.Split('\\');
string theFile = filetosendarray[filetosendarray.Length - 1];
while (true)
{
try
{
using (var client = listener.AcceptTcpClient())
{
if (client == null)
{
continue;
}
using (NetworkStream stream = client.GetStream())
using (FileStream fileStream = File.Create(savePath + "\\" + file + ".encrypted"))
{
int totalrecbytes = 0;
while ((RecBytes = stream.Read(RecData, 0, RecData.Length)) > 0)
{
fileStream.Write(RecData, 0, RecBytes);
totalrecbytes += RecBytes;
}
fileStream.Flush();
fileStream.Close();
TheHelperFiles.decryptFile(savePath + "\\" + file + ".encrypted");
AutoClosingMessageBox.Show("the file: " + theFile + " finished downloading ", "downloading file", 2000);
stream.Close();
var destHmac = TheHelperFiles.fileHmac(savePath + "\\" + file);
bool result = TheHelperFiles.fileCheckHmac(destHmac, sourceHmac);
if (!result)
{
new Thread(() =>
{
LogClass.Log("not valid file HMAC \r\n " +
"filename: " + file +
"\r\n source HMAC: " + sourceHmac +
"\r\n recieved file HMAC: " + destHmac +
"\r\n from: " + IPAddress.Parse(((IPEndPoint)listener.LocalEndpoint).Address.ToString()) +
"\r\n on port: " + ((IPEndPoint)listener.LocalEndpoint).Port.ToString());
}).Start();
MessageBox.Show("the sent file HMAC didnt match with the recieved file HMAC ");
}
}
client.Close();
File.Delete(savePath + "\\" + file + ".encrypted");
}
}
catch (Exception ex) { Console.WriteLine("error in FileRecieve -> " + ex.Message); }
}
return("done");
}
public static String send(IPEndPoint ipEnd, String fileToSend, String port)
{
string[] filetosendarray = fileToSend.Split('\\');
string theFile = filetosendarray[filetosendarray.Length - 1];
byte[] SendingBuffer = null;
TcpClient client = new TcpClient();
client.Connect(ipEnd);
TheHelperFiles.encryptFile(fileToSend);
using (NetworkStream stream = client.GetStream())
{
using (var fileStream = new FileStream(fileToSend + ".encrypted", FileMode.Open, FileAccess.Read))
{
try
{
int NoOfPackets = Convert.ToInt32(Math.Ceiling(Convert.ToDouble(fileStream.Length) / Convert.ToDouble(1024)));
Console.WriteLine("send: number of packets: " + NoOfPackets);
int TotalLength = (int)fileStream.Length, CurrentPacketLength, counter = 0;
for (int i = 0; i < NoOfPackets; i++)
{
if (TotalLength > 1024)
{
CurrentPacketLength = 1024;
TotalLength = TotalLength - CurrentPacketLength;
}
else
{
CurrentPacketLength = TotalLength;
}
SendingBuffer = new byte[CurrentPacketLength];
fileStream.Read(SendingBuffer, 0, CurrentPacketLength);
stream.Write(SendingBuffer, 0, (int)SendingBuffer.Length);
}
AutoClosingMessageBox.Show("the file: " + theFile + " has been sent ", "done sending file", 2000);
fileStream.Close();
File.Delete(fileToSend + ".encrypted");
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
finally
{
stream.Close();
client.Close();
}
}
}
return(" ");
}