private void SendList(Tuple <Socket, string> t)
{
string[] lines = File.ReadAllLines(DBdirectory);
string fileData = "";
for (int i = 0; i < lines.Length; i++)
{
string[] authorsList = lines[i].Split(' ');
if (authorsList[0].Equals(t.Item2))
{
authorsList[5] = "";
authorsList[0] = "";
fileData += string.Join(" ", authorsList) + "\n";
}
}
Byte[] buffer = Encoding.Default.GetBytes(fileData);
Byte[] buffer2 = new Byte[5000 * 1024];
buffer.CopyTo(buffer2, 4);
try
{
t.Item1.Send(buffer2);
Status_Update.AppendText("File list of " + t.Item2 + " is sent.\n");
}
catch
{
Status_Update.AppendText("A problem occured, check your connection\n");
terminating = true;
server.Close();
}
}
// Receive name handler
private bool ReceiveName(Socket thisClient, out string name)
{
bool connect = true;
name = "";
while (connect && !terminating)
{
try
{
Byte[] buffer = new Byte[64];
// get incomming name
thisClient.Receive(buffer);
string incomingName = Encoding.Default.GetString(buffer);
incomingName = incomingName.Substring(0, incomingName.IndexOf("\0"));
foreach (Tuple <Socket, string> check in clients)
{
// check conflicting names
if (incomingName.Equals(check.Item2))
{
return(false);
}
}
name = incomingName.ToString();
Byte[] ack = Encoding.Default.GetBytes("1\0");
try
{
// send response to client
thisClient.Send(ack);
}
catch
{
// Error case: server exceptance
Status_Update.AppendText("A problem occured, check your connection\n");
terminating = true;
server.Close();
return(false);
}
Status_Update.AppendText("Client: " + incomingName + " has joined the server\n");
return(true);
}
catch
{
// Error case: client disconnected
Status_Update.AppendText("Newcomer Client Left before recieving Name\n");
thisClient.Close();
connect = false;
}
}
return(false);
}
// Reject name handler
private void RejectName(Socket thisClient)
{
string message = "0\0";
Byte[] buffer = Encoding.Default.GetBytes(message);
try
{
thisClient.Send(buffer);
}
catch {
Status_Update.AppendText("A problem occured, check your connection\n");
terminating = true;
server.Close();
}
}
// Handle incoming client
private void Accept()
{
while (listen)
{
try
{
Socket newClient = server.Accept();
string newName;
if (ReceiveName(newClient, out newName) == true)
{
// Success case: accept client
Tuple <Socket, string> t = new Tuple <Socket, string>(newClient, newName);
clients.Add(t);
Thread getFile = new Thread(() => receiveFile(t));
getFile.Start();
}
else
{
// Error case: conflicting client name
if (newClient.Connected)
{
RejectName(newClient);
Status_Update.AppendText("A newcomer Client has been rejected due to existing name\n");
newClient.Close();
}
}
}
catch {
// Error case: client acceptance exception
if (terminating)
{
listen = false;
}
else
{
listen = false;
Status_Update.AppendText("The socket stopped working.\n");
}
}
}
}
// Listen button event handler
private void Listen_Button_Click(object sender, EventArgs e)
{
int Port;
if (Int32.TryParse(Port_TextBox.Text, out Port))
{
// Success case: valid port
IPEndPoint endPoint = new IPEndPoint(IPAddress.Any, Port);
server.Bind(endPoint);
server.Listen(3);
listen = true;
Listen_Button.Enabled = false;
Directory_Button.Enabled = false;
// Start accepting clients
Thread acceptClients = new Thread(Accept);
acceptClients.Start();
Status_Update.AppendText("Started listening on Port Number: " + Port + "\n");
}
else
{
// Error case: invalid port
Status_Update.AppendText("Please Check Port Number\n");
}
}
// Handle incoming file
private void receiveFile(Tuple <Socket, string> t)
{
bool connected = true;
while (connected == true && terminating == false)
{
try
{
// Set max file size
Byte[] clientFile = new Byte[50000 * 1024];
int dataLen = t.Item1.Receive(clientFile);
Boolean flag = BitConverter.ToBoolean(clientFile, 0);
if (!flag)
{
int fileNameLen = BitConverter.ToInt32(clientFile, 1);
if (fileNameLen == 0)
{
int request = BitConverter.ToInt32(clientFile, 5);
if (request == 0) ///////////// LIST PART ///////////////////
{
Thread sendFileData = new Thread(() => SendList(t));
sendFileData.Start();
sendFileData.Join();
continue;
} ////////////////// LIST PART ENDS HERE ////////////////////
else if (request == 1) ///////////////// COPY PART //////////////
{
// fileNameLen= 0 means copy request
//int nameLen = BitConverter.ToInt32(clientFile, 5);
//name of the file to be copied
string file_name = Encoding.ASCII.GetString(clientFile, 9, dataLen - 9);
//name of the user who did the copy request
string path_c = @directory + "\\" + t.Item2 + file_name + ".txt";
int ij = 1;
string tmp = "";
Status_Update.AppendText(Encoding.ASCII.GetString(clientFile, 0, 50));
while (File.Exists(path_c))
{
tmp = path_c; // keeping the path of the LAST COPY within the given name
// as a copy source for the requested file.
// Construct path
path_c = @directory + "\\" + t.Item2 + file_name + "-0" + ij.ToString() + ".txt";
ij++;
}
string[] lines = File.ReadAllLines(DBdirectory);
string to_copy = t.Item2 + " File: " + file_name + ".txt";
Byte[] res = new Byte[64]; // result of the copy operation
BitConverter.GetBytes(1).CopyTo(res, 0);
try
{
string data_c = File.ReadAllText(tmp);
using (StreamWriter sw = File.CreateText(path_c))
{
// Write file line
sw.Write(data_c);
}
string DBdata_c = "";// = t.Item2 + " File: " + path_c.Substring(path_c.IndexOf(file_name)) + " Size: " + data_c.Length + " Private " + "Time: " + DateTime.Now.ToString(@"MM\/dd\/yyyy h\:mm tt") + "\n";
for (int temp = 0; temp < lines.Length; temp++)
{
if (lines[temp].Contains(to_copy))
{
DBdata_c = lines[temp];
}
}
string[] tmp_arr = DBdata_c.Split(' ');
tmp_arr[2] = file_name + "-0" + (ij - 1).ToString() + ".txt";
tmp_arr[6] = "Time: " + DateTime.Now.ToString(@"MM\/dd\/yyyy h\:mm tt") + "\n";
DBdata_c = String.Join(" ", tmp_arr, 0, 7);
using (StreamWriter sw = File.AppendText(DBdirectory))
{
// Write file line
sw.Write(DBdata_c);
}
files.Add(path_c);
// Status update
Status_Update.AppendText("From client " + t.Item2 + "copy request for file " + "\"" + file_name + ".txt\" executed.\n");
Encoding.Default.GetBytes("1\0").CopyTo(res, 4); // COPY OPERATION SUCCEDEED
}
catch (Exception ex)
{
bool auth_flg = false;
Encoding.Default.GetBytes("0\0").CopyTo(res, 4); // COPY OPERATION FAILED
Status_Update.AppendText("Copy operation failure!\n");
for (int temp = 0; temp < lines.Length; temp++)
{
if (lines[temp].Contains(file_name))
{
auth_flg = true;
Status_Update.AppendText($"User {t.Item2} has no YETKI to copy this file.\n");
Encoding.Default.GetBytes("2\0").CopyTo(res, 4); // AUTH ERROR
break;
}
}
if (!auth_flg)
{
Status_Update.AppendText("No such file exists.\n");
}
}
try
{
// send response to client
t.Item1.Send(res);
}
catch
{
// Error case: server exceptance
Status_Update.AppendText("A problem occured, check your connection\n");
terminating = true;
server.Close();
}
continue;
}
///////////// COPY PART ENDS HERE ////////////////////////////
else if (request == 2) /////////////////////// DELETE PART STARTS HERE /////////////////////
{
Status_Update.AppendText("Delete request received\n");
string file_name = Encoding.ASCII.GetString(clientFile, 9, dataLen - 9);
string path_delete = @directory + "\\" + t.Item2 + file_name + ".txt";
Byte[] res = new Byte[64]; // result of the delete operation
BitConverter.GetBytes(2).CopyTo(res, 0);
try
{
if (File.Exists(path_delete))
{
string to_delete = t.Item2 + " File: " + file_name + ".txt";
File.Delete(path_delete);
Status_Update.AppendText("File Deleted\n");
string[] lines = File.ReadAllLines(DBdirectory);
for (int temp = 0; temp < lines.Length; temp++)
{
if (lines[temp].Contains(to_delete))
{
lines[temp] = "d e l e t e d";
break;
}
}
File.WriteAllLines(DBdirectory, lines);
Encoding.Default.GetBytes("1\0").CopyTo(res, 4); // Delete OPERATION SUCCEDEED
}
else
{
bool auth_flag = false;
string[] lines = File.ReadAllLines(DBdirectory);
for (int temp = 0; temp < lines.Length; temp++)
{
if (lines[temp].Contains(file_name))
{
auth_flag = true;
break;
}
}
if (auth_flag)
{
Status_Update.AppendText($"User {t.Item2} has no YETKI to delete this file.\n");
Encoding.Default.GetBytes("2\0").CopyTo(res, 4); // Delete OPERATION FAILED
//due to an authentication error
}
else
{
Status_Update.AppendText(path_delete);
Status_Update.AppendText("File Not Found\n");
Encoding.Default.GetBytes("0\0").CopyTo(res, 4); // Delete OPERATION FAILED
}
}
}
catch
{
// Error case: server exceptance
Status_Update.AppendText("A problem occured, check your connection\n");
terminating = true;
server.Close();
}
try
{
// send response to client
t.Item1.Send(res);
}
catch
{
// Error case: server exceptance
Status_Update.AppendText("A problem occured, check your connection\n");
terminating = true;
server.Close();
}
continue;
}
//////////// DELETE PART ENDS HERE ///////////////////////////////
else if (request == 3) ///////////// UPLOAD PART ///////////////////
{
try
{
string uploadFileName = Encoding.ASCII.GetString(clientFile, 9, dataLen - 9);
if (!File.Exists(@directory + "\\" + t.Item2 + uploadFileName))
{
Byte[] buffer = new byte[9];
BitConverter.GetBytes(3).CopyTo(buffer, 0);
t.Item1.Send(buffer);
continue;
}
string text = File.ReadAllText(@directory + "\\" + t.Item2 + uploadFileName);
Byte[] nameData = Encoding.Default.GetBytes(uploadFileName);
Byte[] nameLength = BitConverter.GetBytes(nameData.Length);
Byte[] fileData = Encoding.Default.GetBytes(text);
int packetCount = (int)Math.Ceiling(fileData.Length / (40000.0 * 1024));
Byte[] clientData;
if (packetCount == 1)
{
clientData = new Byte[9 + nameData.Length + fileData.Length];
fileData.CopyTo(clientData, 9 + nameData.Length);
}
else
{
clientData = new Byte[9 + nameData.Length + 40000 * 1024];
fileData.Skip(0).Take(40000 * 1024).ToArray().CopyTo(clientData, 9 + nameData.Length);
}
BitConverter.GetBytes(3).CopyTo(clientData, 0);
nameLength.CopyTo(clientData, 5);
nameData.CopyTo(clientData, 9);
try
{
// Send data
t.Item1.Send(clientData);
}
catch
{
Status_Update.AppendText("Client has disconnected\n");
t.Item1.Close();
}
clientData[4] = (byte)1;
for (int j = 0; j < packetCount - 2; j++)
{
fileData.Skip((j + 1) * 40000 * 1024).Take(40000 * 1024).ToArray().CopyTo(clientData, 9 + nameData.Length);
try
{
// Send data
t.Item1.Send(clientData);
}
catch
{
Status_Update.AppendText("Client has disconnected\n");
t.Item1.Close();
}
}
if (packetCount > 1)
{
Byte[] clientDataLast = new Byte[9 + nameData.Length + fileData.Length - (packetCount - 1) * (40000 * 1024)];
fileData.Skip((packetCount - 1) * 40000 * 1024).Take(fileData.Length - (packetCount - 1) * 40000 * 1024).ToArray().CopyTo(clientDataLast, 9 + nameData.Length);
BitConverter.GetBytes(3).CopyTo(clientDataLast, 0);
clientDataLast[4] = (byte)1;
nameLength.CopyTo(clientDataLast, 5);
nameData.CopyTo(clientDataLast, 9);
try
{
// Send data
t.Item1.Send(clientDataLast);
Status_Update.AppendText("Last\n");
}
catch
{
Status_Update.AppendText("Client has disconnected\n");
t.Item1.Close();
}
}
Status_Update.AppendText(Encoding.Default.GetString(nameData) + " is sent.\n");
}
catch
{
Status_Update.AppendText("Invalid download request received\n");
t.Item1.Close();
}
continue;
} ////////////////// UPLOAD PART ENDS HERE ////////////////////
else if (request == 4)//////////////////////// Make Public Part Starts Here///////////////////////
{
Status_Update.AppendText("Make Public request received\n");
string file_name = Encoding.ASCII.GetString(clientFile, 9, dataLen - 9);
string to_match = t.Item2 + " File: " + file_name + ".txt";
Byte[] res = new Byte[64]; // result of the make public operation
BitConverter.GetBytes(4).CopyTo(res, 0);
try
{
string[] lines = File.ReadAllLines(DBdirectory);
int temp = 0;
for (; temp < lines.Length; temp++)
{
if (lines[temp].Contains(to_match))
{
string[] line = lines[temp].Split(' ');
line[5] = "Public";
lines[temp] = string.Join(" ", line);
Encoding.Default.GetBytes("1\0").CopyTo(res, 4);
break;
}
}
File.WriteAllLines(DBdirectory, lines);
if (temp == lines.Length)
{
Encoding.Default.GetBytes("0\0").CopyTo(res, 4); // Make Public OPERATION Failed
}
}
catch
{
// Error case: server exceptance
Status_Update.AppendText("A problem occured, check your connection\n");
terminating = true;
server.Close();
}
try
{
// send response to client
t.Item1.Send(res);
}
catch
{
// Error case: server exceptance
Status_Update.AppendText("A problem occured, check your connection\n");
terminating = true;
server.Close();
}
continue;
}
else if (request == 5)
{
Thread sendPublic = new Thread(() => sendPublicList(t));
sendPublic.Start();
sendPublic.Join();
continue;
}
else if (request == 6) ///////////// PUBLIC UPLOAD PART ///////////////////
{
try
{
string uploadFileName = Encoding.ASCII.GetString(clientFile, 9, dataLen - 9);
if (!File.Exists(@directory + "\\" + uploadFileName))
{
Byte[] buffer = new byte[9];
BitConverter.GetBytes(6).CopyTo(buffer, 0);
t.Item1.Send(buffer);
continue;
}
//Status_Update.AppendText("gümrük girişi\n");
// gümrük girişi
string[] lines = File.ReadAllLines(DBdirectory);
bool foundFlag = false;
Byte[] failData = new Byte[9];
BitConverter.GetBytes(6).CopyTo(failData, 0);
for (int j = 0; j < lines.Length; j++)
{
try // throws exception for the null lines, just ignore them.
{
string[] tmp = lines[j].Split(' ');
if (tmp[0] + tmp[2] == uploadFileName)
{
if (tmp[5] != "Private")
{
foundFlag = true;
}
break;
}
}
catch { continue; }
}
if (!foundFlag)
{
// send fail (not found) response
t.Item1.Send(failData);
continue;
}
//Status_Update.AppendText("gümrük çıkışı\n");
// gümrük çıkışı
string text = File.ReadAllText(@directory + "\\" + uploadFileName);
Byte[] nameData = Encoding.Default.GetBytes(uploadFileName);
Byte[] nameLength = BitConverter.GetBytes(nameData.Length);
Byte[] fileData = Encoding.Default.GetBytes(text);
int packetCount = (int)Math.Ceiling(fileData.Length / (40000.0 * 1024));
Byte[] clientData;
if (packetCount == 1)
{
clientData = new Byte[9 + nameData.Length + fileData.Length];
fileData.CopyTo(clientData, 9 + nameData.Length);
}
else
{
clientData = new Byte[9 + nameData.Length + 40000 * 1024];
fileData.Skip(0).Take(40000 * 1024).ToArray().CopyTo(clientData, 9 + nameData.Length);
}
BitConverter.GetBytes(6).CopyTo(clientData, 0);
nameLength.CopyTo(clientData, 5);
nameData.CopyTo(clientData, 9);
try
{
// Send data
t.Item1.Send(clientData);
}
catch
{
Status_Update.AppendText("Client has disconnected, soket battı\n");
t.Item1.Close();
}
clientData[4] = (byte)1;
for (int j = 0; j < packetCount - 2; j++)
{
fileData.Skip((j + 1) * 40000 * 1024).Take(40000 * 1024).ToArray().CopyTo(clientData, 9 + nameData.Length);
try
{
// Send data
t.Item1.Send(clientData);
}
catch
{
Status_Update.AppendText("Client has disconnected\n");
t.Item1.Close();
}
}
if (packetCount > 1)
{
Byte[] clientDataLast = new Byte[9 + nameData.Length + fileData.Length - (packetCount - 1) * (40000 * 1024)];
fileData.Skip((packetCount - 1) * 40000 * 1024).Take(fileData.Length - (packetCount - 1) * 40000 * 1024).ToArray().CopyTo(clientDataLast, 9 + nameData.Length);
BitConverter.GetBytes(6).CopyTo(clientDataLast, 0);
clientDataLast[4] = (byte)1;
nameLength.CopyTo(clientDataLast, 5);
nameData.CopyTo(clientDataLast, 9);
try
{
// Send data
t.Item1.Send(clientDataLast);
Status_Update.AppendText("Last\n");
}
catch
{
Status_Update.AppendText("Client has disconnected\n");
t.Item1.Close();
}
}
Status_Update.AppendText(Encoding.Default.GetString(nameData) + " is sent.\n");
}
catch (Exception e)
{
Status_Update.AppendText(e.GetType().ToString());
Status_Update.AppendText("Invalid download request received\n");
t.Item1.Close();
}
continue;
} ///////////// PUBLIC UPLOAD PART END HERE ///////////////////
}
int size = BitConverter.ToInt32(clientFile, 5);
string fileName = Encoding.ASCII.GetString(clientFile, 9, fileNameLen);
string data = Encoding.ASCII.GetString(clientFile, 9 + fileNameLen, dataLen - 9 - fileNameLen);
fileName = fileName.Substring(0, fileName.IndexOf(".txt"));
string path = @directory + "\\" + t.Item2 + fileName + ".txt";
int i = 1;
while (File.Exists(path))
{
// Construct path
path = @directory + "\\" + t.Item2 + fileName + "-0" + i.ToString() + ".txt";
i++;
}
using (StreamWriter sw = File.CreateText(path))
{
// Write file line
sw.Write(data);
}
string DBdata = t.Item2 + " File: " + path.Substring(path.IndexOf(fileName)) + " Size: " + size + "KB Private " + "Time: " + DateTime.Now.ToString(@"MM\/dd\/yyyy h\:mm tt") + "\n";
using (StreamWriter sw = File.AppendText(DBdirectory))
{
// Write file line
sw.Write(DBdata);
}
files.Add(path);
// Status update
Status_Update.AppendText("From client " + t.Item2 + " file " + "\"" + fileName + ".txt\" received.\n");
}
else
{
int fileNameLen = BitConverter.ToInt32(clientFile, 1);
string fileName = Encoding.ASCII.GetString(clientFile, 9, fileNameLen);
string data = Encoding.ASCII.GetString(clientFile, 9 + fileNameLen, dataLen - 9 - fileNameLen);
fileName = fileName.Substring(0, fileName.IndexOf(".txt"));
string path = @directory + "\\" + t.Item2 + fileName;
path = files.FindLast(x => x.Contains(path));
using (StreamWriter sw = File.AppendText(path))
{
// Write file line
sw.Write(data);
}
}
}
catch
{
// Error case: file transfer abortion
t.Item1.Close();
Status_Update.AppendText("Client " + t.Item2 + " has left!\n");
clients.Remove(t);
connected = false;
}
}
}