/// <summary>
/// Matches specified SIP response to SIP dialog. If no matching dialog found, returns null.
/// </summary>
/// <param name="response">SIP response.</param>
/// <returns>Returns matched SIP dialog or null in no match found.</returns>
/// <exception cref="ArgumentNullException">Is raised when <b>response</b> is null.</exception>
internal SIP_Dialog MatchDialog(SIP_Response response)
{
if (response == null)
{
throw new ArgumentNullException("response");
}
SIP_Dialog dialog = null;
try{
string callID = response.CallID;
string fromTag = response.From.Tag;
string toTag = response.To.Tag;
if (callID != null && fromTag != null && toTag != null)
{
string dialogID = callID + "-" + fromTag + "-" + toTag;
lock (m_pDialogs){
m_pDialogs.TryGetValue(dialogID, out dialog);
}
}
}
catch {
}
return(dialog);
}
/// <summary>
/// Matches specified SIP request to SIP dialog. If no matching dialog found, returns null.
/// </summary>
/// <param name="request">SIP request.</param>
/// <returns>Returns matched SIP dialog or null in no match found.</returns>
/// <exception cref="ArgumentNullException">Is raised when <b>request</b> is null.</exception>
internal SIP_Dialog MatchDialog(SIP_Request request)
{
if (request == null)
{
throw new ArgumentNullException("request");
}
SIP_Dialog dialog = null;
try{
string callID = request.CallID;
string localTag = request.To.Tag;
string remoteTag = request.From.Tag;
if (callID != null && localTag != null && remoteTag != null)
{
string dialogID = callID + "-" + localTag + "-" + remoteTag;
lock (m_pDialogs){
m_pDialogs.TryGetValue(dialogID, out dialog);
}
}
}
catch {
}
return(dialog);
}
/// <summary>
/// Gets existing or creates new dialog.
/// </summary>
/// <param name="transaction">Owner transaction what forces to create dialog.</param>
/// <param name="response">Response what forces to create dialog.</param>
/// <returns>Returns dialog.</returns>
/// <exception cref="ArgumentNullException">Is raised when <b>transaction</b> or <b>response</b> is null.</exception>
public SIP_Dialog GetOrCreateDialog(SIP_Transaction transaction, SIP_Response response)
{
if (transaction == null)
{
throw new ArgumentNullException("transaction");
}
if (response == null)
{
throw new ArgumentNullException("response");
}
string dialogID = "";
if (transaction is SIP_ServerTransaction)
{
dialogID = response.CallID + "-" + response.To.Tag + "-" + response.From.Tag;
}
else
{
dialogID = response.CallID + "-" + response.From.Tag + "-" + response.To.Tag;
}
lock (m_pDialogs){
SIP_Dialog dialog = null;
m_pDialogs.TryGetValue(dialogID, out dialog);
// Dialog doesn't exist, create it.
if (dialog == null)
{
if (response.CSeq.RequestMethod.ToUpper() == SIP_Methods.INVITE)
{
dialog = new SIP_Dialog_Invite();
}
else if (response.CSeq.RequestMethod.ToUpper() == SIP_Methods.REFER)
{
dialog = new SIP_Dialog_Refer();
}
else
{
throw new ArgumentException("Method '" + response.CSeq.RequestMethod + "' has no dialog handler.");
}
dialog.Init(m_pStack, transaction, response);
dialog.StateChanged += delegate(object s, EventArgs a){
if (dialog.State == SIP_DialogState.Terminated)
{
m_pDialogs.Remove(dialog.ID);
}
};
m_pDialogs.Add(dialog.ID, dialog);
}
return(dialog);
}
}
/// <summary>
/// Creates new client transaction.
/// </summary>
/// <param name="flow">SIP data flow which is used to send request.</param>
/// <param name="request">SIP request that transaction will handle.</param>
/// <param name="addVia">If true, transaction will add <b>Via:</b> header, otherwise it's user responsibility.</param>
/// <exception cref="ObjectDisposedException">Is raised when this class is Disposed and this method is accessed.</exception>
/// <exception cref="ArgumentNullException">Is raised when <b>flow</b> or <b>request</b> is null reference.</exception>
/// <returns>Returns created transaction.</returns>
public SIP_ClientTransaction CreateClientTransaction(SIP_Flow flow, SIP_Request request, bool addVia)
{
if (m_IsDisposed)
{
throw new ObjectDisposedException(this.GetType().Name);
}
if (flow == null)
{
throw new ArgumentNullException("flow");
}
if (request == null)
{
throw new ArgumentNullException("request");
}
// Add Via:
if (addVia)
{
SIP_t_ViaParm via = new SIP_t_ViaParm();
via.ProtocolName = "SIP";
via.ProtocolVersion = "2.0";
via.ProtocolTransport = flow.Transport;
via.SentBy = new HostEndPoint("transport_layer_will_replace_it", -1);
via.Branch = SIP_t_ViaParm.CreateBranch();
via.RPort = 0;
request.Via.AddToTop(via.ToStringValue());
}
lock (m_pClientTransactions){
SIP_ClientTransaction transaction = new SIP_ClientTransaction(m_pStack, flow, request);
m_pClientTransactions.Add(transaction.Key, transaction);
transaction.StateChanged += new EventHandler(delegate(object s, EventArgs e){
if (transaction.State == SIP_TransactionState.Terminated)
{
lock (m_pClientTransactions){
m_pClientTransactions.Remove(transaction.Key);
}
}
});
SIP_Dialog dialog = MatchDialog(request);
if (dialog != null)
{
dialog.AddTransaction(transaction);
}
return(transaction);
}
}
/// <summary>
/// Creates new SIP server transaction for specified request.
/// </summary>
/// <param name="flow">SIP data flow which is used to receive request.</param>
/// <param name="request">SIP request.</param>
/// <returns>Returns added server transaction.</returns>
/// <exception cref="ObjectDisposedException">Is raised when this class is Disposed and this method is accessed.</exception>
/// <exception cref="ArgumentNullException">Is raised when <b>flow</b> or <b>request</b> is null reference.</exception>
public SIP_ServerTransaction CreateServerTransaction(SIP_Flow flow, SIP_Request request)
{
if (m_IsDisposed)
{
throw new ObjectDisposedException(this.GetType().Name);
}
if (flow == null)
{
throw new ArgumentNullException("flow");
}
if (request == null)
{
throw new ArgumentNullException("request");
}
lock (m_pServerTransactions){
SIP_ServerTransaction transaction = new SIP_ServerTransaction(m_pStack, flow, request);
m_pServerTransactions.Add(transaction.Key, transaction);
transaction.StateChanged += new EventHandler(delegate(object s, EventArgs e){
if (transaction.State == SIP_TransactionState.Terminated)
{
lock (m_pClientTransactions){
m_pServerTransactions.Remove(transaction.Key);
}
}
});
SIP_Dialog dialog = MatchDialog(request);
if (dialog != null)
{
dialog.AddTransaction(transaction);
}
return(transaction);
}
}
/// <summary>
/// Removes specified dialog from dialogs collection.
/// </summary>
/// <param name="dialog">SIP dialog to remove.</param>
internal void RemoveDialog(SIP_Dialog dialog)
{
lock (m_pDialogs){
m_pDialogs.Remove(dialog.ID);
}
}