private void RTSPMessageReceived(RTSPConnection rtspConnection, IPEndPoint remoteEndPoint, byte[] buffer)
{
if (RTSPClientMessageReceived != null)
{
RTSPClientMessageReceived(rtspConnection, remoteEndPoint, buffer);
}
}
private void EndSend(IAsyncResult ar)
{
try
{
RTSPConnection rtspConnection = (RTSPConnection)ar.AsyncState;
rtspConnection.Stream.EndWrite(ar);
}
catch (Exception excp)
{
logger.LogError("Exception RTSPServer EndSend. " + excp.Message);
}
}
/// <summary>
/// Sends data to the RTSP client listening on the destination end point.
/// </summary>
/// <param name="destinationEndPoint">The destination to send the message to.</param>
/// <param name="buffer">The data to send.</param>
public void Send(IPEndPoint dstEndPoint, byte[] buffer)
{
try
{
if (buffer == null)
{
throw new ApplicationException("An empty buffer was specified to Send in SIPTCPChannel.");
}
else if (m_localIPEndPoint.ToString() == dstEndPoint.ToString())
{
logger.LogError("The RTSPServer blocked Send to " + dstEndPoint.ToString() + " as it was identified as a locally hosted TCP socket.\r\n" + Encoding.UTF8.GetString(buffer));
throw new ApplicationException("A Send call was made in RTSPServer to send to another local TCP socket.");
}
else
{
// Lookup a client socket that is connected to the destination.
if (m_connectedSockets.ContainsKey(dstEndPoint.ToString()))
{
RTSPConnection rtspClientConnection = m_connectedSockets[dstEndPoint.ToString()];
try
{
rtspClientConnection.Stream.BeginWrite(buffer, 0, buffer.Length, new AsyncCallback(EndSend), rtspClientConnection);
rtspClientConnection.LastTransmission = DateTime.Now;
}
catch (SocketException)
{
logger.LogWarning("RTSPServer could not send to TCP socket " + dstEndPoint + ", closing and removing.");
rtspClientConnection.Stream.Close();
m_connectedSockets.Remove(dstEndPoint.ToString());
}
}
else
{
logger.LogWarning("Could not send RTSP packet to TCP " + dstEndPoint + " as there was no current connection to the client, dropping message.");
}
}
}
catch (ApplicationException appExcp)
{
logger.LogWarning("ApplicationException RTSPServer Send (sendto=>" + dstEndPoint + "). " + appExcp.Message);
throw;
}
catch (Exception excp)
{
logger.LogError("Exception (" + excp.GetType().ToString() + ") RTSPServer Send (sendto=>" + dstEndPoint + "). " + excp.Message);
throw;
}
}
private void AcceptConnections(string threadName)
{
try
{
Thread.CurrentThread.Name = threadName;
logger.LogDebug("RTSP server socket on " + m_localIPEndPoint + " accept connections thread started.");
while (!Closed)
{
try
{
TcpClient tcpClient = m_tcpServerListener.AcceptTcpClient();
tcpClient.Client.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
IPEndPoint remoteEndPoint = (IPEndPoint)tcpClient.Client.RemoteEndPoint;
logger.LogDebug("RTSP server accepted connection from " + remoteEndPoint + ".");
RTSPConnection rtspClientConnection = new RTSPConnection(this, tcpClient.GetStream(), remoteEndPoint);
lock (m_connectedSockets)
{
m_connectedSockets.Add(remoteEndPoint.ToString(), rtspClientConnection);
}
rtspClientConnection.RTSPSocketDisconnected += RTSPClientDisconnected;
rtspClientConnection.RTSPMessageReceived += RTSPMessageReceived;
rtspClientConnection.Stream.BeginRead(rtspClientConnection.SocketBuffer, 0, MaxMessageSize, new AsyncCallback(ReceiveCallback), rtspClientConnection);
}
catch (Exception acceptExcp)
{
// This exception gets thrown if the remote end disconnects during the socket accept.
logger.LogWarning("Exception RTSPServer accepting socket (" + acceptExcp.GetType() + "). " + acceptExcp.Message);
}
}
logger.LogDebug("RTSP server socket on " + m_localIPEndPoint + " listening halted.");
}
catch (Exception excp)
{
logger.LogError("Exception RTSPServer Listen. " + excp.Message);
}
}
private void ReceiveCallback(IAsyncResult ar)
{
RTSPConnection rtspConnection = (RTSPConnection)ar.AsyncState;
try
{
int bytesRead = rtspConnection.Stream.EndRead(ar);
if (rtspConnection.SocketReadCompleted(bytesRead))
{
rtspConnection.Stream.BeginRead(rtspConnection.SocketBuffer, rtspConnection.SocketBufferEndPosition, MaxMessageSize - rtspConnection.SocketBufferEndPosition, new AsyncCallback(ReceiveCallback), rtspConnection);
}
}
catch (SocketException) // Occurs if the remote end gets disconnected.
{ }
catch (Exception excp)
{
logger.LogWarning("Exception RTSPServer ReceiveCallback. " + excp.Message);
RTSPClientSocketDisconnected(rtspConnection.RemoteEndPoint);
}
}
/// <summary>
/// Periodically checks the established connections and closes any that have not had a transmission for a specified
/// period or where the number of connections allowed per IP address has been exceeded.
/// </summary>
private void PruneConnections(string threadName)
{
try
{
Thread.CurrentThread.Name = threadName;
Thread.Sleep(INITIALPRUNE_CONNECTIONS_DELAY);
while (!Closed)
{
// Check the TCP connections established by RTSP clients for any inactive ones.
try
{
RTSPConnection inactiveConnection = null;
lock (m_connectedSockets)
{
var inactiveConnectionQuery = from connection in m_connectedSockets
where connection.Value.LastTransmission < DateTime.Now.AddMinutes(PRUNE_NOTRANSMISSION_MINUTES * -1)
select connection.Key;
var inactiveConnectionKey = inactiveConnectionQuery.FirstOrDefault();
while (inactiveConnectionKey != null)
{
if (inactiveConnectionKey != null)
{
inactiveConnection = m_connectedSockets[inactiveConnectionKey];
m_connectedSockets.Remove(inactiveConnectionKey);
logger.LogDebug("Pruning inactive RTSP connection on to remote end point " + inactiveConnection.RemoteEndPoint + ".");
inactiveConnection.Close();
}
inactiveConnectionKey = inactiveConnectionQuery.FirstOrDefault();
}
}
}
catch (SocketException)
{
// Will be thrown if the socket is already closed.
}
catch (Exception pruneExcp)
{
logger.LogError("Exception RTSPServer PruneConnections (pruning). " + pruneExcp.Message);
}
// Check the list of active RTSP sessions for any that have stopped communicating or that have closed.
try
{
RTSPSession inactiveSession = null;
lock (m_rtspSessions)
{
var inactiveSessionQuery = from session in m_rtspSessions
where (session.Value.DontTimeout == false &&
session.Value.RTPLastActivityAt < DateTime.Now.AddSeconds(CLOSE_RTSP_SESSION_NO_DATA_SECONDS * -1) &&
session.Value.ControlLastActivityAt < DateTime.Now.AddSeconds(CLOSE_RTSP_SESSION_NO_DATA_SECONDS * -1) &&
session.Value.StartedAt < DateTime.Now.AddSeconds(CLOSE_RTSP_SESSION_NO_DATA_SECONDS * -1) &&
session.Value.CreatedAt < DateTime.Now.AddSeconds(CLOSE_RTSP_SESSION_NO_DATA_SECONDS * -1)) ||
session.Value.IsClosed
select session.Key;
var inactiveSessionKey = inactiveSessionQuery.FirstOrDefault();
while (inactiveSessionKey != null)
{
inactiveSession = m_rtspSessions[inactiveSessionKey];
m_rtspSessions.Remove(inactiveSessionKey);
if (!inactiveSession.IsClosed)
{
logger.LogDebug("Closing inactive RTSP session for session ID " + inactiveSession.SessionID + " established from RTSP client on " + inactiveSession.RemoteEndPoint + " (started at " + inactiveSession.StartedAt + ", RTP last activity at " + inactiveSession.RTPLastActivityAt + ", control last activity at " + inactiveSession.ControlLastActivityAt + ", is closed " + inactiveSession.IsClosed + ").");
inactiveSession.Close();
}
inactiveSessionKey = inactiveSessionQuery.FirstOrDefault();
}
}
}
catch (Exception rtspSessExcp)
{
logger.LogError("Exception RTSPServer checking for inactive RTSP sessions. " + rtspSessExcp);
}
Thread.Sleep(PRUNE_CONNECTIONS_INTERVAL * 1000);
}
logger.LogDebug("RTSPServer socket on " + m_localIPEndPoint.ToString() + " pruning connections halted.");
}
catch (Exception excp)
{
logger.LogError("Exception RTSPServer PruneConnections. " + excp.Message);
}
}
private void RTSPMessageReceived(RTSPConnection rtspConnection, IPEndPoint remoteEndPoint, byte[] buffer)
{
if (RTSPClientMessageReceived != null)
{
RTSPClientMessageReceived(rtspConnection, remoteEndPoint, buffer);
}
}
private void AcceptConnections(string threadName)
{
try
{
Thread.CurrentThread.Name = threadName;
logger.Debug("RTSP server socket on " + m_localIPEndPoint + " accept connections thread started.");
while (!Closed)
{
try
{
TcpClient tcpClient = m_tcpServerListener.AcceptTcpClient();
tcpClient.Client.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
IPEndPoint remoteEndPoint = (IPEndPoint)tcpClient.Client.RemoteEndPoint;
logger.Debug("RTSP server accepted connection from " + remoteEndPoint + ".");
RTSPConnection rtspClientConnection = new RTSPConnection(this, tcpClient.GetStream(), remoteEndPoint);
lock (m_connectedSockets)
{
m_connectedSockets.Add(remoteEndPoint.ToString(), rtspClientConnection);
}
rtspClientConnection.RTSPSocketDisconnected += RTSPClientDisconnected;
rtspClientConnection.RTSPMessageReceived += RTSPMessageReceived;
rtspClientConnection.Stream.BeginRead(rtspClientConnection.SocketBuffer, 0, MaxMessageSize, new AsyncCallback(ReceiveCallback), rtspClientConnection);
}
catch (Exception acceptExcp)
{
// This exception gets thrown if the remote end disconnects during the socket accept.
logger.Warn("Exception RTSPServer accepting socket (" + acceptExcp.GetType() + "). " + acceptExcp.Message);
}
}
logger.Debug("RTSP server socket on " + m_localIPEndPoint + " listening halted.");
}
catch (Exception excp)
{
logger.Error("Exception RTSPServer Listen. " + excp.Message);
}
}