/// <summary>
/// Handels the STAT command.
/// </summary>
private void Stat(Pop3Context context)
{
// TODO: wrong implementation, should only return unread messages
if (context.LastCommand >= COMMAND_PASS)
{
Pop3MessageInfo[] list = new Pop3MessageInfo[0];
if (_storage != null)
{
list = _storage.GetMessageOverview(context.Username);
}
long mailboxSize = 0;
foreach (Pop3MessageInfo l in list)
{
mailboxSize += l.Size;
}
context.WriteLine(String.Format(MESSAGE_STAT, list.Length, mailboxSize));
context.LastCommand = COMMAND_STAT;
}
else
{
context.WriteLine(MESSAGE_INVALID_COMMAND_ORDER);
}
}
/// <summary>
/// Handels the PASS command.
/// </summary>
private void Pass(Pop3Context context, String[] inputs)
{
if (context.LastCommand == COMMAND_USER)
{
if (inputs.Length == 2)
{
IMailStorage mail = (_storage != null ? _storage as IMailStorage : null);
if (mail == null || mail.Login(context.Username, inputs[1]) == true)
{
context.Password = inputs[1];
context.LastCommand = COMMAND_PASS;
context.WriteLine(MESSAGE_PASSWORD_OK);
}
else
{
context.Username = null;
context.Password = null;
context.LastCommand = -1;
context.WriteLine(MESSAGE_PASSWORD_INVALID);
}
}
else
{
context.WriteLine(MESSAGE_INVALID_ARGUMENT_COUNT);
}
}
else
{
context.WriteLine(MESSAGE_INVALID_COMMAND_ORDER);
}
}
/// <summary>
/// Reset the connection state.
/// </summary>
private void Rset(Pop3Context context)
{
if (context.LastCommand != -1)
{
if (context != null && !String.IsNullOrEmpty(context.Username))
{
IMailStorage mail = (_storage != null ? _storage as IMailStorage : null);
if (mail != null)
{
mail.Logout(context.Username);
}
}
context.Reset();
context.Username = null;
context.Password = null;
context.LastCommand = -1;
context.WriteLine(MESSAGE_OK);
}
else
{
context.WriteLine(MESSAGE_INVALID_COMMAND_ORDER);
}
}
public void ProcessConnection()
{
Stream stream;
if (_server.IsSecure && _server.Certificate != null)
{
SslStream ssl = null;
try
{
#if (!MF)
ssl = new SslStream(new NetworkStream(_socket));
ssl.AuthenticateAsServer(_server.Certificate, false, SslProtocols.Default, false);
#else
ssl = new SslStream(_socket);
ssl.AuthenticateAsServer(_server.Certificate, SslVerification.NoVerification, SslProtocols.Default);
#endif
stream = ssl;
}
catch (Exception)
{
//Close();
return;
}
}
else
{
stream = new NetworkStream(_socket);
}
Pop3Context context = new Pop3Context(stream, (IPEndPoint)_socket.LocalEndPoint, (IPEndPoint)_socket.RemoteEndPoint);
try
{
if (_storage != null && !_storage.AcceptClient(context.RemoteEndPoint))
{
throw new Exception("Client not accepted!");
}
SendWelcomeMessage(context);
ProcessCommands(context);
}
catch (Exception)
{
if (_socket.Connected == true)
{
context.WriteLine("-ERR service not available");
}
}
finally
{
_socket.Close();
_socket = null;
context = null;
System.GC.Collect();
}
}
/// <summary>
/// Handels the CAPA command.
/// </summary>
private void Capa(Pop3Context context)
{
context.WriteLine(MESSAGE_OK);
context.WriteLine("TOP");
context.WriteLine("UIDL");
context.WriteLine("USER");
context.WriteLine(MESSAGE_EOF);
}
private void SendWelcomeMessage(Pop3Context context)
{
#if (LOG && !MF && !WindowsCE)
Console.WriteLine("*** Remote IP: {0} ***", context.RemoteEndPoint);
#endif
context.WriteLine(MESSAGE_DEFAULT_WELCOME);
}
/// <summary>
/// Handels the TOP command.
/// </summary>
private void Top(Pop3Context context, String[] inputs)
{
if (context.LastCommand >= COMMAND_STAT)
{
if (inputs.Length == 3)
{
int idx = Convert.ToInt32(inputs[1]);
int linesToRead = Convert.ToInt32(inputs[2]);
context.WriteLine(MESSAGE_RETR);
string message = _storage.ReadMessage(context.Username, idx);
bool foundBody = false;
int lines = 0;
foreach (string line in message.Split(new string[] { "\r\n" }, 100, StringSplitOptions.None))
{
if (line.Length == 0)
{
foundBody = true;
}
if (!foundBody)
{
context.WriteLine(line);
}
else
{
if (lines < linesToRead)
{
context.WriteLine(line);
}
else
{
break;
}
}
}
context.WriteLine(MESSAGE_EOF);
context.LastCommand = COMMAND_RETR;
}
else
{
context.WriteLine(MESSAGE_INVALID_ARGUMENT_COUNT);
}
}
else
{
context.WriteLine(MESSAGE_INVALID_COMMAND_ORDER);
}
}
/// <summary>
/// Handels the UIDL command.
/// </summary>
private void Uidl(Pop3Context context, String[] inputs)
{
if (context.LastCommand >= COMMAND_PASS)
{
if (inputs.Length > 2)
{
context.WriteLine(MESSAGE_INVALID_ARGUMENT_COUNT);
}
else
{
int idx = 0;
if (inputs.Length == 2)
{
idx = Convert.ToInt32(inputs[1]);
}
Pop3MessageInfo[] list = new Pop3MessageInfo[0];
if (_storage != null)
{
list = _storage.GetMessageOverview(context.Username);
}
if (inputs.Length == 1)
{
context.WriteLine(String.Format(MESSAGE_LIST, list.Length));
int id = 1;
foreach (Pop3MessageInfo l in list)
{
context.WriteLine(id + " " + l.UniqueIdentifier);
id++;
}
context.WriteLine(MESSAGE_EOF);
}
else
{
context.WriteLine(string.Format(MESSAGE_STAT, idx, list[idx - 1].UniqueIdentifier));
}
context.LastCommand = COMMAND_LIST;
}
}
else
{
context.WriteLine(MESSAGE_INVALID_COMMAND_ORDER);
}
}
/// <summary>
/// Handels the USER command.
/// </summary>
private void User(Pop3Context context, String[] inputs)
{
if (context.LastCommand == -1)
{
if (inputs.Length == 2)
{
context.Username = inputs[1];
context.LastCommand = COMMAND_USER;
context.WriteLine(MESSAGE_USER_OK);
}
else
{
context.WriteLine(MESSAGE_INVALID_ARGUMENT_COUNT);
}
}
else
{
context.WriteLine(MESSAGE_INVALID_COMMAND_ORDER);
}
}
/// <summary>
/// Handels the DELE command.
/// </summary>
private void Dele(Pop3Context context, String[] inputs)
{
if (context.LastCommand >= COMMAND_STAT)
{
if (inputs.Length == 2)
{
int idx = Convert.ToInt32(inputs[1]);
_storage.DeleteMessage(context.Username, idx);
context.WriteLine(String.Format(MESSAGE_DELE, idx));
context.LastCommand = COMMAND_DELE;
}
else
{
context.WriteLine(MESSAGE_INVALID_ARGUMENT_COUNT);
}
}
else
{
context.WriteLine(MESSAGE_INVALID_COMMAND_ORDER);
}
}
/// <summary>
/// Handels the RETR command.
/// </summary>
private void Retr(Pop3Context context, String[] inputs)
{
if (context.LastCommand >= COMMAND_STAT)
{
if (inputs.Length == 2)
{
int idx = Convert.ToInt32(inputs[1]);
context.WriteLine(MESSAGE_RETR);
context.WriteLine(_storage.ReadMessage(context.Username, idx));
context.WriteLine(MESSAGE_EOF);
context.LastCommand = COMMAND_RETR;
}
else
{
context.WriteLine(MESSAGE_INVALID_ARGUMENT_COUNT);
}
}
else
{
context.WriteLine(MESSAGE_INVALID_COMMAND_ORDER);
}
}
private void ProcessCommands(Pop3Context context)
{
bool isRunning = true;
String inputLine;
while (isRunning)
{
try
{
inputLine = context.ReadLine();
String[] inputs = inputLine.Split(' ');
switch (inputs[0].ToLower())
{
case "user":
User(context, inputs);
break;
case "pass":
Pass(context, inputs);
break;
case "rset":
Rset(context);
break;
case "stat":
Stat(context);
break;
case "list":
List(context, inputs);
break;
case "uidl":
Uidl(context, inputs);
break;
case "retr":
Retr(context, inputs);
break;
case "top":
Top(context, inputs);
break;
case "dele":
Dele(context, inputs);
break;
case "quit":
isRunning = false;
context.WriteLine(MESSAGE_GOODBYE);
context.Close();
break;
case "capa":
Capa(context);
break;
case "auth":
default:
context.WriteLine(MESSAGE_UNKNOWN_COMMAND);
break;
}
}
catch (Exception)
{
isRunning = false;
context.WriteLine(MESSAGE_SYSTEM_ERROR);
context.Close();
}
}
}