public void AddBottomRoute(SIPRoute route)
{
m_sipRoutes.Insert(m_sipRoutes.Count, route);
}
public void SetAt(int index, SIPRoute sipRoute)
{
m_sipRoutes[index] = sipRoute;
}
public void PushRoute(SIPRoute route)
{
m_sipRoutes.Insert(0, route);
}
public void MissingBracketsRouteTest()
{
Console.WriteLine("--> " + System.Reflection.MethodBase.GetCurrentMethod().Name);
SIPRoute newRoute = new SIPRoute("sip:127.0.0.1:5060");
Console.WriteLine(newRoute.ToString());
Assert.IsTrue(newRoute.URI.ToString() == "sip:127.0.0.1:5060", "The Route header URI was not correctly parsed.");
}
public static SIPRoute ParseSIPRoute(string route)
{
if (route.IsNullOrBlank())
{
throw new SIPValidationException(SIPValidationFieldsEnum.RouteHeader, "Cannot create a Route from an blank string.");
}
try
{
SIPRoute sipRoute = new SIPRoute();
sipRoute.m_userField = SIPUserField.ParseSIPUserField(route);
return sipRoute;
}
catch (Exception excp)
{
throw new SIPValidationException(SIPValidationFieldsEnum.RouteHeader, excp.Message);
}
}
/// <summary>
/// This function performs processing on a request to handle any actions that need to be taken based on the Route header.
/// </summary>
/// <remarks>
/// The main sections in the RFC3261 dealing with Route header processing are sections 12.2.1.1 for request processing and
/// 16.4 for proxy processing.
/// The steps to process requests for Route headers are:
/// 1. If route set is empty no further action is required, forward to destination resolved from request URI,
/// 2. If the request URI is identified as a value that was previously set as a Route by this SIP agent it means the
/// previous hop was a strict router. Replace the reqest URI with the last Route header and go to next step,
/// 3. If the top most route header was set by this SIP agent then remove it and go to next step,
/// 4. If the top most route set does contain the lr parameter then forward to the destination resolved by it,
/// 5. If the top most route header does NOT contain the lr parameter is must be popped and inserted as the request URI
/// and the original request URI must be added to the end of the route set, forward to destination resolved from request URI,
/// </remarks>
public void PreProcessRouteInfo(SIPRequest sipRequest)
{
// If there are no routes defined then there is nothing to do.
if (sipRequest.Header.Routes != null && sipRequest.Header.Routes.Length > 0)
{
// If this stack's route URI is being used as the request URI then it will have the loose route parameter (see remarks step 2).
if (sipRequest.URI.Parameters.Has(m_looseRouteParameter))
{
foreach (SIPChannel sipChannel in m_sipChannels.Values)
{
if (sipRequest.URI.ToSIPEndPoint() == sipChannel.SIPChannelEndPoint)
{
// The request URI was this router's address so it was set by a strict router.
// Replace the URI with the original SIP URI that is stored at the end of the route header.
sipRequest.URI = sipRequest.Header.Routes.BottomRoute.URI;
sipRequest.Header.Routes.RemoveBottomRoute();
}
}
}
// The possibility of a strict router on the previous hop has now been handled.
if (sipRequest.Header.Routes != null && sipRequest.Header.Routes.Length > 0)
{
// Check whether the top route header belongs to this proxy (see remarks step 3).
if (!sipRequest.Header.Routes.TopRoute.IsStrictRouter)
{
foreach (SIPChannel sipChannel in m_sipChannels.Values)
{
if (sipRequest.Header.Routes.TopRoute.ToSIPEndPoint() == sipChannel.SIPChannelEndPoint)
{
// Remove the top route as it belongs to this proxy.
sipRequest.ReceivedRoute = sipRequest.Header.Routes.PopRoute();
break;
}
}
}
// Check whether the top route header is a strict router and if so adjust the request accordingly (see remarks step 5).
if (sipRequest.Header.Routes != null && sipRequest.Header.Routes.Length > 0)
{
if (sipRequest.Header.Routes.TopRoute.IsStrictRouter)
{
// Put the strict router's uri into the request URI and place the original request URI at the end of the route set.
SIPRoute strictRoute = sipRequest.Header.Routes.PopRoute();
SIPRoute uriRoute = new SIPRoute(sipRequest.URI);
sipRequest.Header.Routes.AddBottomRoute(uriRoute);
sipRequest.URI = strictRoute.URI;
}
}
}
}
}
private SIPRequest GetRegistrationRequest(SIPProvider sipProvider, SIPProviderBinding binding, SIPEndPoint localSIPEndPoint, int expiry, SIPEndPoint registrarEndPoint)
{
try
{
if (!binding.BindingSIPURI.Parameters.Has(m_regAgentContactId))
{
binding.BindingSIPURI.Parameters.Set(m_regAgentContactId, Crypto.GetRandomString(6));
}
string realm = binding.RegistrarRealm;
SIPURI registerURI = SIPURI.ParseSIPURIRelaxed(realm);
SIPURI regUserURI = SIPURI.ParseSIPURIRelaxed(sipProvider.ProviderUsername + "@" + realm);
SIPFromHeader fromHeader = new SIPFromHeader(null, regUserURI, CallProperties.CreateNewTag());
SIPToHeader toHeader = new SIPToHeader(null, regUserURI, null);
SIPContactHeader contactHeader = new SIPContactHeader(null, binding.BindingSIPURI);
//contactHeader.Expires = binding.BindingExpiry;
string callId = binding.Id.ToString();
int cseq = ++binding.CSeq;
SIPRequest registerRequest = new SIPRequest(SIPMethodsEnum.REGISTER, registerURI);
registerRequest.LocalSIPEndPoint = localSIPEndPoint;
SIPHeader header = new SIPHeader(contactHeader, fromHeader, toHeader, cseq, callId);
header.CSeqMethod = SIPMethodsEnum.REGISTER;
header.UserAgent = m_userAgentString;
header.Expires = binding.BindingExpiry;
SIPViaHeader viaHeader = new SIPViaHeader(localSIPEndPoint, CallProperties.CreateBranchId());
header.Vias.PushViaHeader(viaHeader);
SIPRoute registrarRoute = new SIPRoute(new SIPURI(binding.RegistrarServer.Scheme, registrarEndPoint), true);
header.Routes.PushRoute(registrarRoute);
if (sipProvider != null && !sipProvider.CustomHeaders.IsNullOrBlank())
{
string[] customerHeadersList = sipProvider.CustomHeaders.Split(SIPProvider.CUSTOM_HEADERS_SEPARATOR);
if (customerHeadersList != null && customerHeadersList.Length > 0)
{
foreach (string customHeader in customerHeadersList)
{
if (customHeader.IndexOf(':') == -1)
{
logger.Debug("Skipping custom header due to missing colon, " + customHeader + ".");
continue;
}
else
{
string headerName = customHeader.Substring(0, customHeader.IndexOf(':'));
if (headerName != null && Regex.Match(headerName.Trim(), "(Via|From|To|Contact|CSeq|Call-ID|Max-Forwards|Content)", RegexOptions.IgnoreCase).Success)
{
logger.Debug("Skipping custom header due to an non-permitted string in header name, " + customHeader + ".");
continue;
}
else
{
if (headerName == SIPConstants.SIP_USERAGENT_STRING)
{
header.UserAgent = customHeader.Substring(customHeader.IndexOf(':') + 1);
}
else
{
header.UnknownHeaders.Add(customHeader.Trim());
}
}
}
}
}
}
registerRequest.Header = header;
return registerRequest;
}
catch (Exception excp)
{
logger.Error("Exception GetRegistrationRequest. " + excp.Message);
throw excp;
}
}
public void SetServiceRoute(SIPRoute serviceRoute)
{
m_serviceRoute = serviceRoute;
}