/// <summary>
/// Raises an error (Service unavailable etc)
/// </summary>
/// <param name="transaction">The transaction.</param>
/// <param name="error">The error.</param>
public override void Error(Transaction transaction, string error)
{
if (transaction == null)
{
Transaction = null;
if (!Request.Method.ToUpper().Contains("ACK"))
{
Message response = Message.CreateResponse(503, "Service unavailable - " + error, null, null,
Request);
SendResponse(response);
return;
}
Debug.Assert(false, "Warning, dropping ACK");
}
ProxyBranch branch = GetBranch(transaction);
if (branch == null)
{
return;
}
Transaction = null;
branch.Transaction = null;
if (branch.RemoteCandidates != null && branch.RemoteCandidates.Count > 0)
{
RetryNextCandidate(branch);
}
else
{
ReceivedResponse(null,
Message.CreateResponse(503, "Service unavailable - " + error, null, null,
branch.Request));
}
}
/// <summary>
/// Receives the SIP response
/// </summary>
/// <param name="transaction">The transaction.</param>
/// <param name="response">The response.</param>
public override void ReceivedResponse(Transaction transaction, Message response)
{
ProxyBranch branch = GetBranch(transaction);
if (branch == null)
{
Debug.Assert(false, "Invalid transaction received " + transaction);
return;
}
if (response.Is1XX() && branch.CancelRequest != null)
{
Transaction cancel = Transaction.CreateClient(Stack, this, branch.CancelRequest, transaction.Transport,
transaction.Remote);
branch.CancelRequest = null;
}
else
{
if (response.IsFinal())
{
branch.Response = response;
Stack.ReceivedResponse(this, response);
//SendResponseIfPossible();
}
else
{
response.Headers["Via"].RemoveAt(0);
if (response.Headers["Via"].Count <= 0)
{
response.Headers.Remove("Via");
}
SendResponse(response);
Stack.ReceivedResponse(this, response);
}
}
}
/// <summary>
/// Retries the next candidate to send to.
/// </summary>
/// <param name="branch">The branch.</param>
private void RetryNextCandidate(ProxyBranch branch)
{
if ((RemoteCandidates == null) || (RemoteCandidates.Count == 0))
{
Debug.Assert(false, String.Format("No more DNS resolved address to try"));
}
SIPURI target = RemoteCandidates.First();
RemoteCandidates.RemoveAt(0);
branch.Request.First("Via").Attributes["branch"] += "A";
branch.Transaction = Transaction.CreateClient(Stack, this, branch.Request, Stack.Transport,
target.Host + ":" + target.Port);
}
/// <summary>
/// Handles request timeouts
/// </summary>
/// <param name="transaction">The transaction.</param>
private void TimeOut(Transaction transaction)
{
ProxyBranch branch = GetBranch(transaction);
if (branch == null)
{
return;
}
branch.Transaction = null;
if (branch.RemoteCandidates != null && branch.RemoteCandidates.Count > 0)
{
RetryNextCandidate(branch);
}
else
{
ReceivedResponse(null, Message.CreateResponse(408, "Request timeout", null, null, branch.Request));
}
}
/// <summary>
/// Retries the next candidate to send to.
/// </summary>
/// <param name="branch">The branch.</param>
private void RetryNextCandidate(ProxyBranch branch)
{
if ((RemoteCandidates == null) || (RemoteCandidates.Count == 0))
{
Debug.Assert(false, String.Format("No more DNS resolved address to try"));
}
SIPURI target = RemoteCandidates.First();
RemoteCandidates.RemoveAt(0);
branch.Request.First("Via").Attributes["branch"] += "A";
branch.Transaction = Transaction.CreateClient(Stack, this, branch.Request, Stack.Transport,
target.Host + ":" + target.Port);
}
/// <summary>
/// Sends the SIP request.
/// </summary>
/// <param name="request">The request.</param>
public override void SendRequest(Message request)
{
SIPURI target = null;
if (request.First("Route") == null)
{
target = request.Uri;
}
else
{
var routes = request.Headers["Route"];
if (routes.Count > 0)
{
try
{
target = ((Address)routes[0].Value).Uri;
string test = target.Parameters["lr"];
}
catch (Exception)
{
routes.RemoveAt(0);
if (routes.Count > 0)
{
routes.Add(new Header(request.Uri.ToString(), "Route"));
}
request.Headers["Route"] = routes;
request.Uri = target;
}
}
}
Stack.Sending(this, request);
ProxyBranch branch = new ProxyBranch();
SIPURI dest = target.Dup();
if (target.Port <= 0)
{
dest.Port = 5060;
}
else
{
dest.Port = target.Port;
}
if (!Helpers.IsIPv4(dest.Host))
{
try
{
IPAddress[] addresses = Dns.GetHostAddresses(dest.Host);
dest.Host = addresses[0].ToString();
}
catch (Exception)
{
}
}
if (Helpers.IsIPv4(dest.Host))
{
branch.RemoteCandidates = new List<SIPURI> { dest };
}
if (branch.RemoteCandidates == null || branch.RemoteCandidates.Count == 0)
{
Error(null, "Cannot resolve DNS target");
return;
}
target = branch.RemoteCandidates.First();
branch.RemoteCandidates.RemoveAt(0);
if (!request.Method.ToUpper().Contains("ACK"))
{
branch.Transaction = Transaction.CreateClient(Stack, this, request, Stack.Transport, target.HostPort());
branch.Request = request;
_branches.Add(branch);
}
else
{
Stack.Send(request, target.HostPort());
}
}
/// <summary>
/// Sends the SIP request.
/// </summary>
/// <param name="request">The request.</param>
public override void SendRequest(Message request)
{
SIPURI target = null;
if (request.First("Route") == null)
{
target = request.Uri;
}
else
{
var routes = request.Headers["Route"];
if (routes.Count > 0)
{
try
{
target = ((Address)routes[0].Value).Uri;
string test = target.Parameters["lr"];
}
catch (Exception)
{
routes.RemoveAt(0);
if (routes.Count > 0)
{
routes.Add(new Header(request.Uri.ToString(), "Route"));
}
request.Headers["Route"] = routes;
request.Uri = target;
}
}
}
Stack.Sending(this, request);
ProxyBranch branch = new ProxyBranch();
SIPURI dest = target.Dup();
if (target.Port <= 0)
{
dest.Port = 5060;
}
else
{
dest.Port = target.Port;
}
if (!Helpers.IsIPv4(dest.Host))
{
try
{
IPAddress[] addresses = Dns.GetHostAddresses(dest.Host);
dest.Host = addresses[0].ToString();
}
catch (Exception)
{
}
}
if (Helpers.IsIPv4(dest.Host))
{
branch.RemoteCandidates = new List <SIPURI> {
dest
};
}
if (branch.RemoteCandidates == null || branch.RemoteCandidates.Count == 0)
{
Error(null, "Cannot resolve DNS target");
return;
}
target = branch.RemoteCandidates.First();
branch.RemoteCandidates.RemoveAt(0);
if (!request.Method.ToUpper().Contains("ACK"))
{
branch.Transaction = Transaction.CreateClient(Stack, this, request, Stack.Transport, target.HostPort());
branch.Request = request;
_branches.Add(branch);
}
else
{
Stack.Send(request, target.HostPort());
}
}
