private Boolean TimedOut(DccFileSession session)
{
if ((DateTime.Now - session.LastActivity) >= timeout)
{
return(true);
}
return(false);
}
internal void RemoveSession(DccFileSession session)
{
sessions.Remove(session.ID);
if (sessions.Count == 0)
{
timerStopped = true;
timerThread.Change(Timeout.Infinite, TimeoutCheckPeriod);
}
Debug.WriteLineIf(DccUtil.DccTrace.TraceInfo, "[" + Thread.CurrentThread.Name + "] DccSessionManager::RemoveSession() ID=" + session.ID);
}
internal void AddSession(DccFileSession session)
{
sessions.Add(session.ID, session);
if (timerStopped)
{
timerStopped = false;
timerThread.Change(TimeoutCheckPeriod, TimeoutCheckPeriod);
}
Debug.WriteLineIf(DccUtil.DccTrace.TraceInfo, "[" + Thread.CurrentThread.Name + "] DccSessionManager::AddSession() ID=" + session.ID);
}
internal void CheckSessions(object state)
{
Debug.WriteLineIf(DccUtil.DccTrace.TraceVerbose, "[" + Thread.CurrentThread.Name + "] DccSessionManager::CheckSessions()");
sessionClone = (Hashtable)sessions.Clone();
foreach (object session in sessionClone.Values)
{
DccFileSession fileSession = (DccFileSession)session;
lock ( fileSession )
{
if (TimedOut(fileSession))
{
fileSession.TimedOut();
}
}
}
}
/// <summary>
/// Attempt to send a file to a remote user. Start listening
/// on the given port and address. If the remote user does not accept
/// the offer within the timeout period the the session
/// will be closed.
/// </summary>
/// <remarks>
/// This method should be called from within a try/catch block
/// in case there are socket errors. This methods will also automatically
/// handle a Resume if the remote client requests it.
/// </remarks>
/// <param name="dccUser">The information about the remote user.</param>
/// <param name="listenIPAddress">The IP address of the local machine in dot
/// quad format (e.g. 192.168.0.25). This is the address that will be sent to the
/// remote user. The IP address of the NAT machine must be used if the
/// client is behind a NAT/Firewall system. </param>
/// <param name="listenPort">The port that the session will listen on.</param>
/// <param name="dccFileInfo">The file to be sent. If the file name has spaces in it
/// they will be replaced with underscores when the name is sent.</param>
/// <param name="bufferSize">The size of the send buffer. Generally should
/// be between 4k and 32k.</param>
/// <param name="turbo">True to use send-ahead mode for transfers.</param>
/// <returns>A unique session instance for this file and remote user.</returns>
/// <exception cref="ArgumentException">If the listen port is already in use.</exception>
public static DccFileSession Send(
DccUser dccUser,
string listenIPAddress,
int listenPort,
DccFileInfo dccFileInfo,
int bufferSize,
bool turbo)
{
Debug.WriteLineIf(DccUtil.DccTrace.TraceInfo, "[" + Thread.CurrentThread.Name + "] DccFileSession::Send()");
DccFileSession session = null;
//Test if we are already using this port
if (DccFileSessionManager.DefaultInstance.ContainsSession("S" + listenPort))
{
throw new ArgumentException("Already listening on port " + listenPort);
}
try
{
session = new DccFileSession(dccUser, dccFileInfo, bufferSize, listenPort, "S" + listenPort);
//set turbo mode
session.turboMode = turbo;
//Set server IP address
session.listenIPAddress = listenIPAddress;
//Add session to active sessions hashtable
DccFileSessionManager.DefaultInstance.AddSession(session);
//Create stream to file
dccFileInfo.OpenForRead();
//Start session Thread
session.thread = new Thread(new ThreadStart(session.Listen));
session.thread.Name = session.ToString();
session.thread.Start();
//Send DCC Send request to remote user
session.DccSend(IPAddress.Parse(listenIPAddress));
return(session);
}
catch (Exception ex)
{
if (session != null)
{
DccFileSessionManager.DefaultInstance.RemoveSession(session);
}
throw ex;
}
}
/// <summary>
/// Another user has offered to send a file. This method should be called
/// to accept the offer and save the file to the give location. The parameters
/// needed to call this method are provided by the <c>OnDccFileTransferRequest()</c>
/// event.
/// </summary>
/// <remarks>
/// This method should be called from within a try/catch block
/// in case it is unable to connect or there are other socket
/// errors.
/// </remarks>
/// <param name="dccUser">Information on the remote user.</param>
/// <param name="dccFileInfo">The local file that will hold the data being sent. If the file
/// is the result of a previous incomplete download the the attempt will be made
/// to resume where the previous left off.</param>
/// <param name="turbo">Will the send ahead protocol be used.</param>
/// <returns>A unique session instance for this file and remote user.</returns>
/// <exception cref="ArgumentException">If the listen port is already in use.</exception>
public static DccFileSession Receive(DccUser dccUser, DccFileInfo dccFileInfo, bool turbo)
{
Debug.WriteLineIf(DccUtil.DccTrace.TraceInfo, "[" + Thread.CurrentThread.Name + "] DccFileSession::Receive()");
//Test if we are already using this port
if (DccFileSessionManager.DefaultInstance.ContainsSession("C" + dccUser.remoteEndPoint.Port))
{
throw new ArgumentException("Already listening on port " + dccUser.remoteEndPoint.Port);
}
DccFileSession session = null;
try
{
session = new DccFileSession(dccUser, dccFileInfo, (64 * 1024),
dccUser.remoteEndPoint.Port, "C" + dccUser.remoteEndPoint.Port);
//Has the initiator specified the turbo protocol?
session.turboMode = turbo;
//Open file for writing
dccFileInfo.OpenForWrite();
DccFileSessionManager.DefaultInstance.AddSession(session);
//Determine if we can resume a download
if (session.dccFileInfo.ShouldResume())
{
session.waitingOnAccept = true;
session.dccFileInfo.SetResumeToFileSize();
session.SendResume();
}
else
{
session.thread = new Thread(new ThreadStart(session.Download));
session.thread.Name = session.ToString();
session.thread.Start();
}
return(session);
}
catch (Exception ex)
{
if (session != null)
{
DccFileSessionManager.DefaultInstance.RemoveSession(session);
}
throw ex;
}
}
private Boolean TimedOut( DccFileSession session )
{
if( ( DateTime.Now - session.LastActivity ) >= timeout )
{
return true;
}
return false;
}
internal void RemoveSession( DccFileSession session )
{
sessions.Remove( session.ID );
if( sessions.Count == 0 )
{
timerStopped = true;
timerThread.Change( Timeout.Infinite, TimeoutCheckPeriod );
}
Debug.WriteLineIf( DccUtil.DccTrace.TraceInfo, "[" + Thread.CurrentThread.Name +"] DccSessionManager::RemoveSession() ID=" + session.ID );
}
internal void AddSession( DccFileSession session )
{
sessions.Add( session.ID, session );
if( timerStopped )
{
timerStopped = false;
timerThread.Change(TimeoutCheckPeriod, TimeoutCheckPeriod);
}
Debug.WriteLineIf( DccUtil.DccTrace.TraceInfo, "[" + Thread.CurrentThread.Name +"] DccSessionManager::AddSession() ID=" + session.ID );
}
/// <summary>
/// Attempt to send a file to a remote user. Start listening
/// on the given port and address. If the remote user does not accept
/// the offer within the timeout period the the session
/// will be closed.
/// </summary>
/// <remarks>
/// This method should be called from within a try/catch block
/// in case there are socket errors. This methods will also automatically
/// handle a Resume if the remote client requests it.
/// </remarks>
/// <param name="dccUser">The information about the remote user.</param>
/// <param name="listenIPAddress">The IP address of the local machine in dot
/// quad format (e.g. 192.168.0.25). This is the address that will be sent to the
/// remote user. The IP address of the NAT machine must be used if the
/// client is behind a NAT/Firewall system. </param>
/// <param name="listenPort">The port that the session will listen on.</param>
/// <param name="dccFileInfo">The file to be sent. If the file name has spaces in it
/// they will be replaced with underscores when the name is sent.</param>
/// <param name="bufferSize">The size of the send buffer. Generally should
/// be between 4k and 32k.</param>
/// <param name="turbo">True to use send-ahead mode for transfers.</param>
/// <returns>A unique session instance for this file and remote user.</returns>
/// <exception cref="ArgumentException">If the listen port is already in use.</exception>
public static DccFileSession Send(
DccUser dccUser,
string listenIPAddress,
int listenPort,
DccFileInfo dccFileInfo,
int bufferSize,
bool turbo)
{
Debug.WriteLineIf(DccUtil.DccTrace.TraceInfo, "[" + Thread.CurrentThread.Name + "] DccFileSession::Send()");
DccFileSession session = null;
//Test if we are already using this port
if (DccFileSessionManager.DefaultInstance.ContainsSession("S" + listenPort))
{
throw new ArgumentException("Already listening on port " + listenPort);
}
try
{
session = new DccFileSession(dccUser, dccFileInfo, bufferSize, listenPort, "S" + listenPort);
//set turbo mode
session.turboMode = turbo;
//Set server IP address
session.listenIPAddress = listenIPAddress;
//Add session to active sessions hashtable
DccFileSessionManager.DefaultInstance.AddSession(session);
//Create stream to file
dccFileInfo.OpenForRead();
//Start session Thread
session.thread = new Thread(new ThreadStart(session.Listen));
session.thread.Name = session.ToString();
session.thread.Start();
//Send DCC Send request to remote user
session.DccSend(IPAddress.Parse(listenIPAddress));
return session;
}
catch (Exception ex)
{
if (session != null)
{
DccFileSessionManager.DefaultInstance.RemoveSession(session);
}
throw ex;
}
}
/// <summary>
/// Another user has offered to send a file. This method should be called
/// to accept the offer and save the file to the give location. The parameters
/// needed to call this method are provided by the <c>OnDccFileTransferRequest()</c>
/// event.
/// </summary>
/// <remarks>
/// This method should be called from within a try/catch block
/// in case it is unable to connect or there are other socket
/// errors.
/// </remarks>
/// <param name="dccUser">Information on the remote user.</param>
/// <param name="dccFileInfo">The local file that will hold the data being sent. If the file
/// is the result of a previous incomplete download the the attempt will be made
/// to resume where the previous left off.</param>
/// <param name="turbo">Will the send ahead protocol be used.</param>
/// <returns>A unique session instance for this file and remote user.</returns>
/// <exception cref="ArgumentException">If the listen port is already in use.</exception>
public static DccFileSession Receive(DccUser dccUser, DccFileInfo dccFileInfo, bool turbo)
{
Debug.WriteLineIf(DccUtil.DccTrace.TraceInfo, "[" + Thread.CurrentThread.Name + "] DccFileSession::Receive()");
//Test if we are already using this port
if (DccFileSessionManager.DefaultInstance.ContainsSession("C" + dccUser.remoteEndPoint.Port))
{
throw new ArgumentException("Already listening on port " + dccUser.remoteEndPoint.Port);
}
DccFileSession session = null;
try
{
session = new DccFileSession(dccUser, dccFileInfo, (64 * 1024),
dccUser.remoteEndPoint.Port, "C" + dccUser.remoteEndPoint.Port);
//Has the initiator specified the turbo protocol?
session.turboMode = turbo;
//Open file for writing
dccFileInfo.OpenForWrite();
DccFileSessionManager.DefaultInstance.AddSession(session);
//Determine if we can resume a download
if (session.dccFileInfo.ShouldResume())
{
session.waitingOnAccept = true;
session.dccFileInfo.SetResumeToFileSize();
session.SendResume();
}
else
{
session.thread = new Thread(new ThreadStart(session.Download));
session.thread.Name = session.ToString();
session.thread.Start();
}
return session;
}
catch (Exception ex)
{
if (session != null)
{
DccFileSessionManager.DefaultInstance.RemoveSession(session);
}
throw ex;
}
}
internal void Parse(Connection connection, string message)
{
Debug.WriteLineIf(DccUtil.DccTrace.TraceInfo, "[" + Thread.CurrentThread.Name + "] DccListener::Parse()");
Match match = parser.Match(message);
string requestor = match.Groups[1].ToString();
string[] tokens = tokenizer.Split(match.Groups[2].ToString().Trim());
switch (tokens[Action])
{
case CHAT:
if (OnDccChatRequest != null)
{
//Test for sufficient number of arguments
if (tokens.Length < 4)
{
connection.Listener.Error(ReplyCode.UnparseableMessage, "Incorrect CHAT arguments: " + message);
return;
}
//Send event
DccUser dccUser = null;
try
{
dccUser = new DccUser(
connection,
Rfc2812Util.ParseUserLine(requestor),
new IPEndPoint(DccUtil.LongToIPAddress(tokens[Address]), int.Parse(tokens[Port], CultureInfo.InvariantCulture)));
}
catch (ArgumentException)
{
connection.Listener.Error(ReplyCode.BadDccEndpoint, "Invalid TCP/IP connection information sent.");
return;
}
try
{
OnDccChatRequest(dccUser);
}
catch (ArgumentException ae)
{
connection.Listener.Error(ReplyCode.UnknownEncryptionProtocol, ae.ToString());
}
}
break;
case SEND:
//Test for sufficient number of arguments
if (tokens.Length < 5)
{
connection.Listener.Error(ReplyCode.UnparseableMessage, "Incorrect SEND arguments: " + message);
return;
}
if (OnDccSendRequest != null)
{
DccUser dccUser = null;
try
{
dccUser = new DccUser(
connection,
Rfc2812Util.ParseUserLine(requestor),
new IPEndPoint(DccUtil.LongToIPAddress(tokens[Address]), int.Parse(tokens[Port], CultureInfo.InvariantCulture)));
}
catch (ArgumentException ae)
{
connection.Listener.Error(ReplyCode.BadDccEndpoint, ae.ToString());
return;
}
try
{
OnDccSendRequest(
dccUser,
tokens[FileName],
int.Parse(tokens[FileSize], CultureInfo.InvariantCulture),
IsTurbo(5, tokens));
}
catch (ArgumentException ae)
{
connection.Listener.Error(ReplyCode.UnknownEncryptionProtocol, ae.ToString());
}
}
break;
case GET:
//Test for sufficient number of arguments
if (tokens.Length < 2)
{
connection.Listener.Error(ReplyCode.UnparseableMessage, "Incorrect GET arguments: " + message);
return;
}
if (OnDccGetRequest != null)
{
try
{
OnDccGetRequest(
new DccUser(
connection,
Rfc2812Util.ParseUserLine(requestor)),
tokens[FileName],
IsTurbo(2, tokens));
}
catch (ArgumentException ae)
{
connection.Listener.Error(ReplyCode.UnknownEncryptionProtocol, ae.ToString());
}
}
break;
case ACCEPT:
//Test for sufficient number of arguments
if (tokens.Length < 4)
{
connection.Listener.Error(ReplyCode.UnparseableMessage, "Incorrect DCC ACCEPT arguments: " + message);
return;
}
//DccListener will try to handle Receive at correct file position
try
{
DccFileSession session = DccFileSessionManager.DefaultInstance.LookupSession("C" + tokens[2]);
session.OnDccAcceptReceived(long.Parse(tokens[3], CultureInfo.InvariantCulture));
}
catch (ArgumentException e)
{
connection.Listener.Error(ReplyCode.UnableToResume, e.ToString());
}
break;
case RESUME:
//Test for sufficient number of arguments
if (tokens.Length < 4)
{
connection.Listener.Error(ReplyCode.UnparseableMessage, "Incorrect DCC RESUME arguments: " + message);
return;
}
//DccListener will automatically handle Resume/Accept interaction
try
{
DccFileSession session = DccFileSessionManager.DefaultInstance.LookupSession("S" + tokens[2]);
session.OnDccResumeRequest(long.Parse(tokens[3], CultureInfo.InvariantCulture));
}
catch (ArgumentException e)
{
connection.Listener.Error(ReplyCode.UnableToResume, e.ToString());
}
break;
default:
connection.Listener.Error(ReplyCode.UnparseableMessage, message);
Debug.WriteLineIf(DccUtil.DccTrace.TraceError, "[" + Thread.CurrentThread.Name + "] DccListener::Parse() Unknown DCC command");
break;
}
}
