/// <summary>
/// This method is called when new request is received.
/// </summary>
/// <param name="e">Request event arguments.</param>
private void OnRequestReceived(SIP_RequestReceivedEventArgs e)
{
SIP_Request request = e.Request;
try{
#region Statefull
// Statefull
if ((m_ProxyMode & SIP_ProxyMode.Statefull) != 0)
{
// Statefull proxy is transaction statefull proxy only,
// what don't create dialogs and keep dialog state.
/* RFC 3261 16.10.
* StateFull proxy:
* If a matching response context is found, the element MUST
* immediately return a 200 (OK) response to the CANCEL request.
*
* If a response context is not found, the element does not have any
* knowledge of the request to apply the CANCEL to. It MUST statelessly
* forward the CANCEL request (it may have statelessly forwarded the
* associated request previously).
*/
if (e.Request.RequestLine.Method == SIP_Methods.CANCEL)
{
// Don't do server transaction before we get CANCEL matching transaction.
SIP_ServerTransaction trToCancel = m_pStack.TransactionLayer.MatchCancelToTransaction(e.Request);
if (trToCancel != null)
{
trToCancel.Cancel();
e.ServerTransaction.SendResponse(m_pStack.CreateResponse(SIP_ResponseCodes.x200_Ok, request));
}
else
{
ForwardRequest(false, e, true);
}
}
// ACK never creates transaction, it's always passed directly to transport layer.
else if (e.Request.RequestLine.Method == SIP_Methods.ACK)
{
ForwardRequest(false, e, true);
}
else
{
ForwardRequest(true, e, true);
}
}
#endregion
#region B2BUA
// B2BUA
else if ((m_ProxyMode & SIP_ProxyMode.B2BUA) != 0)
{
m_pB2BUA.OnRequestReceived(e);
}
#endregion
#region Stateless
// Stateless
else if ((m_ProxyMode & SIP_ProxyMode.Stateless) != 0)
{
// Stateless proxy don't do transaction, just forwards all.
ForwardRequest(false, e, true);
}
#endregion
#region Proxy won't accept command
else
{
e.ServerTransaction.SendResponse(m_pStack.CreateResponse(SIP_ResponseCodes.x501_Not_Implemented, request));
}
#endregion
}
catch (Exception x) {
try{
m_pStack.TransportLayer.SendResponse(m_pStack.CreateResponse(SIP_ResponseCodes.x500_Server_Internal_Error + ": " + x.Message, e.Request));
}
catch {
// Skip transport layer exception if send fails.
}
// Don't raise OnError for transport errors.
if (!(x is SIP_TransportException))
{
m_pStack.OnError(x);
}
}
}
/// <summary>
/// This method is called when new request is received.
/// </summary>
/// <param name="e">Request event arguments.</param>
private void OnRequestReceived(SIP_RequestReceivedEventArgs e)
{
/* RFC 3261 16.12. ????????? Forward does all thse steps.
* 1. The proxy will inspect the Request-URI. If it indicates a
* resource owned by this proxy, the proxy will replace it with
* the results of running a location service. Otherwise, the
* proxy will not change the Request-URI.
*
* 2. The proxy will inspect the URI in the topmost Route header
* field value. If it indicates this proxy, the proxy removes it
* from the Route header field (this route node has been reached).
*
* 3. The proxy will forward the request to the resource indicated
* by the URI in the topmost Route header field value or in the
* Request-URI if no Route header field is present. The proxy
* determines the address, port and transport to use when
* forwarding the request by applying the procedures in [4] to that URI.
*/
SIP_Request request = e.Request;
try
{
#region Registrar
// Registrar
if ((m_ProxyMode & SIP_ProxyMode.Registrar) != 0 &&
request.RequestLine.Method == SIP_Methods.REGISTER)
{
m_pRegistrar.Register(e);
}
#endregion
#region Presence
/*
* // Presence
* else if((m_ProxyMode & SIP_ProxyMode.Presence) != 0 && (request.Method == "SUBSCRIBE" || request.Method == "NOTIFY")){
*
* }
*/
#endregion
#region Statefull
// Statefull
else if ((m_ProxyMode & SIP_ProxyMode.Statefull) != 0)
{
// Statefull proxy is transaction statefull proxy only,
// what don't create dialogs and keep dialog state.
/* RFC 3261 16.10.
* StateFull proxy:
* If a matching response context is found, the element MUST
* immediately return a 200 (OK) response to the CANCEL request.
*
* If a response context is not found, the element does not have any
* knowledge of the request to apply the CANCEL to. It MUST statelessly
* forward the CANCEL request (it may have statelessly forwarded the
* associated request previously).
*/
if (e.Request.RequestLine.Method == SIP_Methods.CANCEL)
{
// Don't do server transaction before we get CANCEL matching transaction.
SIP_ServerTransaction trToCancel =
m_pStack.TransactionLayer.MatchCancelToTransaction(e.Request);
if (trToCancel != null)
{
trToCancel.Cancel();
e.ServerTransaction.SendResponse(m_pStack.CreateResponse(
SIP_ResponseCodes.x200_Ok, request));
}
else
{
ForwardRequest(false, e);
}
}
// ACK never creates transaction, it's always passed directly to transport layer.
else if (e.Request.RequestLine.Method == SIP_Methods.ACK)
{
ForwardRequest(false, e);
}
else
{
ForwardRequest(true, e);
}
}
#endregion
#region B2BUA
// B2BUA
else if ((m_ProxyMode & SIP_ProxyMode.B2BUA) != 0)
{
m_pB2BUA.OnRequestReceived(e);
}
#endregion
#region Stateless
// Stateless
else if ((m_ProxyMode & SIP_ProxyMode.Stateless) != 0)
{
// Stateless proxy don't do transaction, just forwards all.
ForwardRequest(false, e);
}
#endregion
#region Proxy won't accept command
else
{
e.ServerTransaction.SendResponse(
m_pStack.CreateResponse(SIP_ResponseCodes.x501_Not_Implemented, request));
}
#endregion
}
catch (Exception x)
{
try
{
m_pStack.TransportLayer.SendResponse(
m_pStack.CreateResponse(
SIP_ResponseCodes.x500_Server_Internal_Error + ": " + x.Message, e.Request));
}
catch
{
// Skip transport layer exception if send fails.
}
// Don't raise OnError for transport errors.
if (!(x is SIP_TransportException))
{
m_pStack.OnError(x);
}
}
}