public static void DNSNAPTRRecordLookup(string host, bool async, ref SIPDNSLookupResult lookupResult)
{
SIPMonitorLogEvent(new SIPMonitorConsoleEvent(SIPMonitorServerTypesEnum.Unknown, SIPMonitorEventTypesEnum.DNS, "SIP DNS NAPTR record lookup initiated for " + host + ".", null));
// Target is a hostname with no explicit port, DNS lookup for NAPTR records.
DNSResponse naptrRecordResponse = DNSManager.Lookup(host, DNSQType.NAPTR, DNS_LOOKUP_TIMEOUT, null, true, async);
if (naptrRecordResponse == null && async)
{
lookupResult.Pending = true;
}
else if (naptrRecordResponse.Timedout)
{
lookupResult.NAPTRTimedoutAt = DateTime.Now;
}
else if (naptrRecordResponse.Error == null && naptrRecordResponse.RecordNAPTR != null && naptrRecordResponse.RecordNAPTR.Length > 0)
{
foreach (RecordNAPTR naptrRecord in naptrRecordResponse.RecordNAPTR)
{
SIPDNSServiceResult sipNAPTRResult = new SIPDNSServiceResult(SIPServices.GetService(naptrRecord.Service), naptrRecord.Order, 0, naptrRecord.RR.TTL, naptrRecord.Replacement, 0, DateTime.Now);
lookupResult.AddNAPTRResult(sipNAPTRResult);
SIPMonitorLogEvent(new SIPMonitorConsoleEvent(SIPMonitorServerTypesEnum.Unknown, SIPMonitorEventTypesEnum.DNS, "SIP DNS NAPTR record found for " + host + ", result " + naptrRecord.Service + " " + naptrRecord.Replacement + ".", null));
}
}
else
{
SIPMonitorLogEvent(new SIPMonitorConsoleEvent(SIPMonitorServerTypesEnum.Unknown, SIPMonitorEventTypesEnum.DNS, "SIP DNS no NAPTR records found for " + host + ".", null));
}
}
private void SendInitialRegister()
{
try
{
if (m_attempts >= MAX_REGISTER_ATTEMPTS)
{
Log_External(new SIPMonitorConsoleEvent(SIPMonitorServerTypesEnum.UserAgentClient, SIPMonitorEventTypesEnum.ContactRegisterFailed, "Registration to " + m_sipAccountAOR.ToString() + " reached the maximum number of allowed attempts without a failure condition.", m_owner));
m_isRegistered = false;
if (RegistrationTemporaryFailure != null)
{
RegistrationTemporaryFailure(m_sipAccountAOR, "Registration reached the maximum number of allowed attempts.");
}
m_waitForRegistrationMRE.Set();
}
else
{
m_attempts++;
SIPEndPoint registrarSIPEndPoint = m_outboundProxy;
if (registrarSIPEndPoint == null)
{
SIPDNSLookupResult lookupResult = m_sipTransport.GetHostEndPoint(m_registrarHost, false);
if (lookupResult.LookupError != null)
{
Log_External(new SIPMonitorConsoleEvent(SIPMonitorServerTypesEnum.UserAgentClient, SIPMonitorEventTypesEnum.ContactRegisterFailed, "Could not resolve " + m_registrarHost + ", " + lookupResult.LookupError, m_owner));
}
else
{
registrarSIPEndPoint = lookupResult.GetSIPEndPoint();
}
}
if (registrarSIPEndPoint == null && RegistrationFailed != null)
{
RegistrationFailed(m_sipAccountAOR, "Could not resolve " + m_registrarHost + ".");
}
else
{
Log_External(new SIPMonitorConsoleEvent(SIPMonitorServerTypesEnum.UserAgentClient, SIPMonitorEventTypesEnum.ContactRegisterInProgress, "Initiating registration to " + m_registrarHost + " at " + registrarSIPEndPoint.ToString() + " for " + m_sipAccountAOR.ToString() + ".", m_owner));
SIPRequest regRequest = GetRegistrationRequest(m_localEndPoint);
SIPNonInviteTransaction regTransaction = m_sipTransport.CreateNonInviteTransaction(regRequest, registrarSIPEndPoint, m_localEndPoint, m_outboundProxy);
// These handlers need to be on their own threads to take the processing off the SIP transport layer.
regTransaction.NonInviteTransactionFinalResponseReceived += (lep, rep, tn, rsp) => { ThreadPool.QueueUserWorkItem(delegate { ServerResponseReceived(lep, rep, tn, rsp); }); };
regTransaction.NonInviteTransactionTimedOut += (tn) => { ThreadPool.QueueUserWorkItem(delegate { RegistrationTimedOut(tn); }); };
m_sipTransport.SendSIPReliable(regTransaction);
}
}
}
catch (Exception excp)
{
logger.Error("Exception SendInitialRegister to " + m_registrarHost + ". " + excp.Message);
if (RegistrationFailed != null)
{
RegistrationFailed(m_sipAccountAOR, "Exception SendInitialRegister to " + m_registrarHost + ". " + excp.Message);
}
}
}
public static SIPDNSLookupResult DNSAAAARecordLookup(string host, int port, bool async, SIPURI uri, SIPDNSLookupResult lookupResult = null)
{
SIPMonitorLogEvent(new SIPMonitorConsoleEvent(SIPMonitorServerTypesEnum.Unknown, SIPMonitorEventTypesEnum.DNS, "SIP DNS A record lookup requested for " + host + ".", null));
SIPDNSLookupResult result = lookupResult ?? new SIPDNSLookupResult(uri);
result.LookupError = null;
DNSResponse aaaaRecordResponse = DNSManager.Lookup(host, QType.AAAA, DNS_A_RECORD_LOOKUP_TIMEOUT, null, true, async);
if (aaaaRecordResponse == null)
{
if (async)
{
result.Pending = true;
}
}
else if (aaaaRecordResponse.Timedout)
{
result.ATimedoutAt = DateTime.Now;
}
else if (!string.IsNullOrWhiteSpace(aaaaRecordResponse.Error))
{
result.LookupError = aaaaRecordResponse.Error;
}
else if (aaaaRecordResponse.RecordsAAAA == null || aaaaRecordResponse.RecordsAAAA.Length == 0)
{
SIPMonitorLogEvent(new SIPMonitorConsoleEvent(SIPMonitorServerTypesEnum.Unknown, SIPMonitorEventTypesEnum.DNS, "SIP DNS no AAAA records found for " + host + ".", null));
result.LookupError = "No AAAA records found for " + host + ".";
}
else
{
SIPURI sipURI = result.URI;
foreach (RecordAAAA aRecord in aaaaRecordResponse.RecordsAAAA)
{
SIPDNSLookupEndPoint sipLookupEndPoint = new SIPDNSLookupEndPoint(new SIPEndPoint(sipURI.Protocol, new IPEndPoint(aRecord.Address, port)), aRecord.RR.TTL);
result.AddLookupResult(sipLookupEndPoint);
SIPMonitorLogEvent(new SIPMonitorConsoleEvent(SIPMonitorServerTypesEnum.Unknown, SIPMonitorEventTypesEnum.DNS, "SIP DNS AAAA record found for " + host + ", result " + sipLookupEndPoint.LookupEndPoint.ToString() + ".", null));
}
}
return(result);
}
public static SIPDNSLookupResult DNSNameRecordLookup(string host, int port, bool async, SIPURI lookupURI, ref SIPDNSLookupResult lookupResult, bool?preferIPv6 = null)
{
SIPDNSLookupResult result = null;
if (lookupResult.SIPSRVResults != null)
{
foreach (SIPDNSServiceResult nextSRVRecord in lookupResult.SIPSRVResults)
{
if (nextSRVRecord != null && nextSRVRecord.Data != null)
{
result = DNSNameRecordLookup(nextSRVRecord.Data, nextSRVRecord.Port, async, lookupResult.URI, lookupResult, preferIPv6);
if (result.LookupError == null)
{
return(result);
}
}
}
}
result = DNSNameRecordLookup(host, port, async, lookupResult.URI, lookupResult, preferIPv6);
return(result);
}
public static SIPDNSLookupResult ResolveSIPService(SIPURI sipURI, bool async)
{
try
{
if (sipURI == null)
{
throw new ArgumentNullException("sipURI", "Cannot resolve SIP service on a null URI.");
}
string host = sipURI.Host;
int port = (sipURI.Scheme == SIPSchemesEnum.sip) ? m_defaultSIPPort : m_defaultSIPSPort;
bool explicitPort = false;
if (sipURI.Host.IndexOf(':') != -1)
{
host = sipURI.Host.Split(':')[0];
Int32.TryParse(sipURI.Host.Split(':')[1], out port);
explicitPort = true;
}
if (Regex.Match(host, @"^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$").Success)
{
// Target is an IP address, no DNS lookup required.
IPAddress hostIP = IPAddress.Parse(host);
SIPDNSLookupEndPoint sipLookupEndPoint = new SIPDNSLookupEndPoint(new SIPEndPoint(sipURI.Protocol, new IPEndPoint(hostIP, port)), 0);
SIPDNSLookupResult result = new SIPDNSLookupResult(sipURI);
result.AddLookupResult(sipLookupEndPoint);
return result;
}
else if (explicitPort)
{
// Target is a hostname with an explicit port, DNS lookup for A or AAAA record.
return DNSARecordLookup(host, port, async, sipURI);
}
else
{
// Target is a hostname with no explicit port, use the whole NAPTR->SRV->A lookup procedure.
SIPDNSLookupResult sipLookupResult = new SIPDNSLookupResult(sipURI);
// Do without the NAPTR lookup for the time being. Very few organisations appear to use them and it can cost up to 2.5s to get a failed resolution.
/*SIPMonitorLogEvent(new SIPMonitorConsoleEvent(SIPMonitorServerTypesEnum.Unknown, SIPMonitorEventTypesEnum.DNS, "SIP DNS full lookup requested for " + sipURI.ToString() + ".", null));
DNSNAPTRRecordLookup(host, async, ref sipLookupResult);
if (sipLookupResult.Pending)
{
if (!m_inProgressSIPServiceLookups.Contains(sipURI.ToString()))
{
m_inProgressSIPServiceLookups.Add(sipURI.ToString());
ThreadPool.QueueUserWorkItem(delegate { ResolveSIPService(sipURI, false); });
}
return sipLookupResult;
}*/
DNSSRVRecordLookup(sipURI.Scheme, sipURI.Protocol, host, async, ref sipLookupResult);
if (sipLookupResult.Pending)
{
//logger.Debug("SIPDNSManager SRV lookup for " + host + " is pending.");
return sipLookupResult;
}
else
{
//logger.Debug("SIPDNSManager SRV lookup for " + host + " is final.");
SIPDNSServiceResult nextSRVRecord = sipLookupResult.GetNextUnusedSRV();
int lookupPort = (nextSRVRecord != null) ? nextSRVRecord.Port : port;
return DNSARecordLookup(nextSRVRecord, host, lookupPort, async, sipLookupResult.URI);
}
}
}
catch (Exception excp)
{
logger.Error("Exception SIPDNSManager ResolveSIPService (" + sipURI.ToString() + "). " + excp.Message);
m_inProgressSIPServiceLookups.Remove(sipURI.ToString());
return new SIPDNSLookupResult(sipURI, excp.Message);
}
}
public static void DNSSRVRecordLookup(SIPSchemesEnum scheme, SIPProtocolsEnum protocol, string host, bool async, ref SIPDNSLookupResult lookupResult)
{
SIPServicesEnum reqdNAPTRService = SIPServicesEnum.none;
if (scheme == SIPSchemesEnum.sip && protocol == SIPProtocolsEnum.udp)
{
reqdNAPTRService = SIPServicesEnum.sipudp;
}
else if (scheme == SIPSchemesEnum.sip && protocol == SIPProtocolsEnum.tcp)
{
reqdNAPTRService = SIPServicesEnum.siptcp;
}
else if (scheme == SIPSchemesEnum.sips && protocol == SIPProtocolsEnum.tcp)
{
reqdNAPTRService = SIPServicesEnum.sipstcp;
}
else if (scheme == SIPSchemesEnum.sip && protocol == SIPProtocolsEnum.tls)
{
reqdNAPTRService = SIPServicesEnum.siptls;
}
// If there are NAPTR records available see if there is a matching one for the SIP scheme and protocol required.
SIPDNSServiceResult naptrService = null;
if (lookupResult.SIPNAPTRResults != null && lookupResult.SIPNAPTRResults.Count > 0)
{
if (reqdNAPTRService != SIPServicesEnum.none && lookupResult.SIPNAPTRResults.ContainsKey(reqdNAPTRService))
{
naptrService = lookupResult.SIPNAPTRResults[reqdNAPTRService];
}
}
// Construct the SRV target to lookup depending on whether an NAPTR record was available or not.
string srvLookup = null;
if (naptrService != null)
{
srvLookup = naptrService.Data;
}
else
{
srvLookup = "_" + scheme.ToString() + "._" + protocol.ToString() + "." + host;
}
SIPMonitorLogEvent(new SIPMonitorConsoleEvent(SIPMonitorServerTypesEnum.Unknown, SIPMonitorEventTypesEnum.DNS, "SIP DNS SRV record lookup requested for " + srvLookup + ".", null));
DNSResponse srvRecordResponse = DNSManager.Lookup(srvLookup, DNSQType.SRV, DNS_LOOKUP_TIMEOUT, null, true, async);
if (srvRecordResponse == null && async)
{
SIPMonitorLogEvent(new SIPMonitorConsoleEvent(SIPMonitorServerTypesEnum.Unknown, SIPMonitorEventTypesEnum.DNS, "SIP DNS SRV record lookup pending for " + srvLookup + ".", null));
lookupResult.Pending = true;
}
else if (srvRecordResponse.Timedout)
{
SIPMonitorLogEvent(new SIPMonitorConsoleEvent(SIPMonitorServerTypesEnum.Unknown, SIPMonitorEventTypesEnum.DNS, "SIP DNS SRV record lookup timed out for " + srvLookup + ".", null));
lookupResult.SRVTimedoutAt = DateTime.Now;
}
else if (srvRecordResponse.Error != null)
{
SIPMonitorLogEvent(new SIPMonitorConsoleEvent(SIPMonitorServerTypesEnum.Unknown, SIPMonitorEventTypesEnum.DNS, "SIP DNS SRV record lookup for " + srvLookup + " returned error of " + lookupResult.LookupError + ".", null));
}
else if (srvRecordResponse.Error == null && srvRecordResponse.RecordSRV != null && srvRecordResponse.RecordSRV.Length > 0)
{
foreach (RecordSRV srvRecord in srvRecordResponse.RecordSRV)
{
SIPDNSServiceResult sipSRVResult = new SIPDNSServiceResult(reqdNAPTRService, srvRecord.Priority, srvRecord.Weight, srvRecord.RR.TTL, srvRecord.Target, srvRecord.Port, DateTime.Now);
lookupResult.AddSRVResult(sipSRVResult);
SIPMonitorLogEvent(new SIPMonitorConsoleEvent(SIPMonitorServerTypesEnum.Unknown, SIPMonitorEventTypesEnum.DNS, "SIP DNS SRV record found for " + srvLookup + ", result " + srvRecord.Target + " " + srvRecord.Port + ".", null));
}
}
else
{
SIPMonitorLogEvent(new SIPMonitorConsoleEvent(SIPMonitorServerTypesEnum.Unknown, SIPMonitorEventTypesEnum.DNS, "SIP DNS no SRV records found for " + srvLookup + ".", null));
}
}
public static void DNSNAPTRRecordLookup(string host, bool async, ref SIPDNSLookupResult lookupResult)
{
SIPMonitorLogEvent(new SIPMonitorConsoleEvent(SIPMonitorServerTypesEnum.Unknown, SIPMonitorEventTypesEnum.DNS, "SIP DNS NAPTR record lookup initiated for " + host + ".", null));
// Target is a hostname with no explicit port, DNS lookup for NAPTR records.
DNSResponse naptrRecordResponse = DNSManager.Lookup(host, DNSQType.NAPTR, DNS_LOOKUP_TIMEOUT, null, true, async);
if (naptrRecordResponse == null && async)
{
lookupResult.Pending = true;
}
else if (naptrRecordResponse.Timedout)
{
lookupResult.NAPTRTimedoutAt = DateTime.Now;
}
else if (naptrRecordResponse.Error == null && naptrRecordResponse.RecordNAPTR != null && naptrRecordResponse.RecordNAPTR.Length > 0)
{
foreach (RecordNAPTR naptrRecord in naptrRecordResponse.RecordNAPTR)
{
SIPDNSServiceResult sipNAPTRResult = new SIPDNSServiceResult(SIPServices.GetService(naptrRecord.Service), naptrRecord.Order, 0, naptrRecord.RR.TTL, naptrRecord.Replacement, 0, DateTime.Now);
lookupResult.AddNAPTRResult(sipNAPTRResult);
SIPMonitorLogEvent(new SIPMonitorConsoleEvent(SIPMonitorServerTypesEnum.Unknown, SIPMonitorEventTypesEnum.DNS, "SIP DNS NAPTR record found for " + host + ", result " + naptrRecord.Service + " " + naptrRecord.Replacement + ".", null));
}
}
else
{
SIPMonitorLogEvent(new SIPMonitorConsoleEvent(SIPMonitorServerTypesEnum.Unknown, SIPMonitorEventTypesEnum.DNS, "SIP DNS no NAPTR records found for " + host + ".", null));
}
}
public static SIPDNSLookupResult DNSARecordLookup(string host, int port, bool async, SIPURI uri)
{
SIPMonitorLogEvent(new SIPMonitorConsoleEvent(SIPMonitorServerTypesEnum.Unknown, SIPMonitorEventTypesEnum.DNS, "SIP DNS A record lookup requested for " + host + ".", null));
SIPDNSLookupResult result = new SIPDNSLookupResult(uri);
DNSResponse aRecordResponse = DNSManager.Lookup(host, DNSQType.A, DNS_A_RECORD_LOOKUP_TIMEOUT, null, true, async);
if (aRecordResponse == null && async)
{
result.Pending = true;
}
else if (aRecordResponse.Timedout)
{
result.ATimedoutAt = DateTime.Now;
}
else if (aRecordResponse.Error != null)
{
result.LookupError = aRecordResponse.Error;
}
else if (aRecordResponse.RecordsA == null || aRecordResponse.RecordsA.Length == 0)
{
SIPMonitorLogEvent(new SIPMonitorConsoleEvent(SIPMonitorServerTypesEnum.Unknown, SIPMonitorEventTypesEnum.DNS, "SIP DNS no A records found for " + host + ".", null));
result.LookupError = "No A records found for " + host + ".";
}
else
{
SIPURI sipURI = result.URI;
foreach (RecordA aRecord in aRecordResponse.RecordsA)
{
SIPDNSLookupEndPoint sipLookupEndPoint = new SIPDNSLookupEndPoint(new SIPEndPoint(sipURI.Protocol, new IPEndPoint(aRecord.Address, port)), aRecord.RR.TTL);
result.AddLookupResult(sipLookupEndPoint);
SIPMonitorLogEvent(new SIPMonitorConsoleEvent(SIPMonitorServerTypesEnum.Unknown, SIPMonitorEventTypesEnum.DNS, "SIP DNS A record found for " + host + ", result " + sipLookupEndPoint.LookupEndPoint.ToString() + ".", null));
}
}
return result;
}
/// <summary>
/// The event handler for responses to the initial register request.
/// </summary>
private void ServerResponseReceived(SIPEndPoint localSIPEndPoint, SIPEndPoint remoteEndPoint, SIPTransaction sipTransaction, SIPResponse sipResponse)
{
try
{
Log_External(new SIPMonitorConsoleEvent(SIPMonitorServerTypesEnum.UserAgentClient, SIPMonitorEventTypesEnum.ContactRegisterInProgress, "Server response " + sipResponse.Status + " received for " + m_sipAccountAOR.ToString() + ".", null));
if (sipResponse.Status == SIPResponseStatusCodesEnum.ProxyAuthenticationRequired || sipResponse.Status == SIPResponseStatusCodesEnum.Unauthorised)
{
if (sipResponse.Header.AuthenticationHeader != null)
{
if (m_attempts >= MAX_REGISTER_ATTEMPTS)
{
Log_External(new SIPMonitorConsoleEvent(SIPMonitorServerTypesEnum.UserAgentClient, SIPMonitorEventTypesEnum.ContactRegisterFailed, "Registration to " + m_sipAccountAOR.ToString() + " reached the maximum number of allowed attempts without a failure condition.", null));
m_isRegistered = false;
RegistrationTemporaryFailure?.Invoke(m_sipAccountAOR, "Registration reached the maximum number of allowed attempts.");
m_waitForRegistrationMRE.Set();
}
else
{
m_attempts++;
SIPRequest authenticatedRequest = GetAuthenticatedRegistrationRequest(sipTransaction.TransactionRequest, sipResponse);
SIPEndPoint registrarSIPEndPoint = m_outboundProxy;
if (registrarSIPEndPoint == null)
{
SIPDNSLookupResult lookupResult = m_sipTransport.GetHostEndPoint(m_registrarHost, false);
if (lookupResult.LookupError != null)
{
Log_External(new SIPMonitorConsoleEvent(SIPMonitorServerTypesEnum.UserAgentClient, SIPMonitorEventTypesEnum.ContactRegisterFailed, "Could not resolve " + m_registrarHost + ", " + lookupResult.LookupError, null));
}
else
{
registrarSIPEndPoint = lookupResult.GetSIPEndPoint();
}
}
if (registrarSIPEndPoint == null)
{
logger.LogWarning("SIPRegistrationAgent could not resolve " + m_registrarHost + ".");
RegistrationFailed?.Invoke(m_sipAccountAOR, "Could not resolve " + m_registrarHost + ".");
}
else
{
SIPNonInviteTransaction regAuthTransaction = new SIPNonInviteTransaction(m_sipTransport, authenticatedRequest, registrarSIPEndPoint);
regAuthTransaction.NonInviteTransactionFinalResponseReceived += (lep, rep, tn, rsp) => { ThreadPool.QueueUserWorkItem(delegate { AuthResponseReceived(lep, rep, tn, rsp); }); return(Task.FromResult(SocketError.Success)); };
regAuthTransaction.NonInviteTransactionTimedOut += (tn) => { ThreadPool.QueueUserWorkItem(delegate { RegistrationTimedOut(tn); }); };
m_sipTransport.SendTransaction(regAuthTransaction);
}
}
}
else
{
Log_External(new SIPMonitorConsoleEvent(SIPMonitorServerTypesEnum.UserAgentClient, SIPMonitorEventTypesEnum.ContactRegisterFailed, "Registration failed with " + sipResponse.Status + " but no authentication header was supplied for " + m_sipAccountAOR.ToString() + ".", null));
m_isRegistered = false;
RegistrationTemporaryFailure?.Invoke(m_sipAccountAOR, "Registration failed with " + sipResponse.Status + " but no authentication header was supplied.");
m_waitForRegistrationMRE.Set();
}
}
else
{
if (sipResponse.Status == SIPResponseStatusCodesEnum.Ok)
{
if (m_expiry > 0)
{
m_isRegistered = true;
m_expiry = GetUpdatedExpiry(sipResponse);
RegistrationSuccessful?.Invoke(m_sipAccountAOR);
}
else
{
m_isRegistered = false;
RegistrationRemoved?.Invoke(m_sipAccountAOR);
}
m_waitForRegistrationMRE.Set();
}
else if (sipResponse.Status == SIPResponseStatusCodesEnum.Forbidden || sipResponse.Status == SIPResponseStatusCodesEnum.NotFound)
{
// SIP account does not appear to exist.
Log_External(new SIPMonitorConsoleEvent(SIPMonitorServerTypesEnum.UserAgentClient, SIPMonitorEventTypesEnum.ContactRegisterFailed, "Registration failed with " + sipResponse.Status + " for " + m_sipAccountAOR.ToString() + ", no further registration attempts will be made.", null));
string reasonPhrase = (sipResponse.ReasonPhrase.IsNullOrBlank()) ? sipResponse.Status.ToString() : sipResponse.ReasonPhrase;
RegistrationFailed?.Invoke(m_sipAccountAOR, "Registration failed with " + (int)sipResponse.Status + " " + reasonPhrase + ".");
m_exit = true;
m_waitForRegistrationMRE.Set();
}
else if (sipResponse.Status == SIPResponseStatusCodesEnum.IntervalTooBrief && m_expiry != 0)
{
m_expiry = GetUpdatedExpiryForIntervalTooBrief(sipResponse);
Log_External(new SIPMonitorConsoleEvent(SIPMonitorServerTypesEnum.UserAgentClient, SIPMonitorEventTypesEnum.ContactRegisterInProgress, "Registration for " + m_sipAccountAOR.ToString() + " had a too short expiry, updated to +" + m_expiry + " and trying again.", null));
SendInitialRegister();
}
else
{
Log_External(new SIPMonitorConsoleEvent(SIPMonitorServerTypesEnum.UserAgentClient, SIPMonitorEventTypesEnum.ContactRegisterFailed, "Registration failed with " + sipResponse.Status + " for " + m_sipAccountAOR.ToString() + ".", null));
m_isRegistered = false;
RegistrationTemporaryFailure?.Invoke(m_sipAccountAOR, "Registration failed with " + sipResponse.Status + ".");
m_waitForRegistrationMRE.Set();
}
}
}
catch (Exception excp)
{
logger.LogError("Exception SIPRegistrationUserAgent ServerResponseReceived (" + remoteEndPoint + "). " + excp.Message);
}
}
/// <summary>
/// Initiates a SUBSCRIBE request to a notification server.
/// </summary>
/// <param name="subscribeToURI">The SIP user that dialog notifications are being subscribed to.</param>
public void Subscribe(SIPURI subscribeURI, int expiry, SIPEventPackage sipEventPackage, string subscribeCallID, SIPURI contactURI)
{
try
{
if (m_attempts >= MAX_SUBSCRIBE_ATTEMPTS)
{
Log_External(new SIPMonitorConsoleEvent(SIPMonitorServerTypesEnum.NotifierClient, SIPMonitorEventTypesEnum.SubscribeFailed, "Susbcription to " + subscribeURI.ToString() + " reached the maximum number of allowed attempts without a failure condition.", null));
m_subscribed = false;
SubscriptionFailed(subscribeURI, SIPResponseStatusCodesEnum.InternalServerError, "Subscription reached the maximum number of allowed attempts.");
m_waitForSubscribeResponse.Set();
}
else
{
m_attempts++;
m_localCSeq++;
SIPRequest subscribeRequest = m_sipTransport.GetRequest(
SIPMethodsEnum.SUBSCRIBE,
m_resourceURI,
new SIPToHeader(null, subscribeURI, m_subscriptionToTag),
null);
if (contactURI != null)
{
subscribeRequest.Header.Contact = new List <SIPContactHeader>()
{
new SIPContactHeader(null, contactURI)
};
}
subscribeRequest.Header.From = new SIPFromHeader(null, new SIPURI(m_authUsername, m_authDomain, null, SIPSchemesEnum.sip, SIPProtocolsEnum.udp), m_subscriptionFromTag);
subscribeRequest.Header.CSeq = m_localCSeq;
subscribeRequest.Header.Expires = expiry;
subscribeRequest.Header.Event = sipEventPackage.ToString();
subscribeRequest.Header.CallId = subscribeCallID;
if (!m_filter.IsNullOrBlank())
{
subscribeRequest.Body = m_filter;
subscribeRequest.Header.ContentLength = m_filter.Length;
subscribeRequest.Header.ContentType = m_filterTextType;
}
SIPEndPoint dstEndPoint = m_outboundProxy;
if (dstEndPoint == null)
{
SIPDNSLookupResult lookupResult = m_sipTransport.GetURIEndPoint(m_resourceURI, false);
if (lookupResult.LookupError != null)
{
Log_External(new SIPMonitorConsoleEvent(SIPMonitorServerTypesEnum.NotifierClient, SIPMonitorEventTypesEnum.SubscribeFailed, "Could not resolve " + m_resourceURI.Host + ", " + lookupResult.LookupError, null));
}
else
{
dstEndPoint = lookupResult.GetSIPEndPoint();
}
}
SIPNonInviteTransaction subscribeTransaction = m_sipTransport.CreateNonInviteTransaction(subscribeRequest, dstEndPoint, null, m_outboundProxy);
subscribeTransaction.NonInviteTransactionFinalResponseReceived += SubscribeTransactionFinalResponseReceived;
subscribeTransaction.NonInviteTransactionTimedOut += SubsribeTransactionTimedOut;
m_sipTransport.SendSIPReliable(subscribeTransaction);
LastSubscribeAttempt = DateTime.Now;
}
}
catch (Exception excp)
{
logger.Error("Exception SIPNotifierClient Subscribe. " + excp.Message);
SubscriptionFailed(m_resourceURI, SIPResponseStatusCodesEnum.InternalServerError, "Exception Subscribing. " + excp.Message);
m_waitForSubscribeResponse.Set();
}
}
public static SIPDNSLookupResult ResolveSIPService(SIPURI sipURI, bool async)
{
try
{
if (sipURI == null)
{
throw new ArgumentNullException("sipURI", "Cannot resolve SIP service on a null URI.");
}
string host = sipURI.Host;
int port = (sipURI.Scheme == SIPSchemesEnum.sip) ? m_defaultSIPPort : m_defaultSIPSPort;
bool explicitPort = false;
if (sipURI.Host.IndexOf(':') != -1)
{
host = sipURI.Host.Split(':')[0];
Int32.TryParse(sipURI.Host.Split(':')[1], out port);
explicitPort = true;
}
if (Regex.Match(host, @"^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$").Success)
{
// Target is an IP address, no DNS lookup required.
IPAddress hostIP = IPAddress.Parse(host);
SIPDNSLookupEndPoint sipLookupEndPoint = new SIPDNSLookupEndPoint(new SIPEndPoint(sipURI.Protocol, new IPEndPoint(hostIP, port)), 0);
SIPDNSLookupResult result = new SIPDNSLookupResult(sipURI);
result.AddLookupResult(sipLookupEndPoint);
return(result);
}
else if (explicitPort)
{
// Target is a hostname with an explicit port, DNS lookup for A or AAAA record.
return(DNSARecordLookup(host, port, async, sipURI));
}
else
{
// Target is a hostname with no explicit port, use the whole NAPTR->SRV->A lookup procedure.
SIPDNSLookupResult sipLookupResult = new SIPDNSLookupResult(sipURI);
// Do without the NAPTR lookup for the time being. Very few organisations appear to use them and it can cost up to 2.5s to get a failed resolution.
/*SIPMonitorLogEvent(new SIPMonitorConsoleEvent(SIPMonitorServerTypesEnum.Unknown, SIPMonitorEventTypesEnum.DNS, "SIP DNS full lookup requested for " + sipURI.ToString() + ".", null));
* DNSNAPTRRecordLookup(host, async, ref sipLookupResult);
* if (sipLookupResult.Pending)
* {
* if (!m_inProgressSIPServiceLookups.Contains(sipURI.ToString()))
* {
* m_inProgressSIPServiceLookups.Add(sipURI.ToString());
* ThreadPool.QueueUserWorkItem(delegate { ResolveSIPService(sipURI, false); });
* }
* return sipLookupResult;
* }*/
DNSSRVRecordLookup(sipURI.Scheme, sipURI.Protocol, host, async, ref sipLookupResult);
if (sipLookupResult.Pending)
{
//logger.Debug("SIPDNSManager SRV lookup for " + host + " is pending.");
return(sipLookupResult);
}
else
{
//logger.Debug("SIPDNSManager SRV lookup for " + host + " is final.");
// Add some custom logic to cope with sips SRV records using _sips._tcp (e.g. free.call.ciscospark.com).
// By default only _sips._tls SRV records are checked for. THis block adds an additional check for _sips._tcp SRV records.
//if ((sipLookupResult.SIPSRVResults == null || sipLookupResult.SIPSRVResults.Count == 0) && sipURI.Scheme == SIPSchemesEnum.sips)
//{
// DNSSRVRecordLookup(sipURI.Scheme, SIPProtocolsEnum.tcp, host, async, ref sipLookupResult);
// SIPDNSServiceResult nextSRVRecord = sipLookupResult.GetNextUnusedSRV();
// int lookupPort = (nextSRVRecord != null) ? nextSRVRecord.Port : port;
// return DNSARecordLookup(nextSRVRecord, host, lookupPort, async, sipLookupResult.URI);
//}
//else
//{
SIPDNSServiceResult nextSRVRecord = sipLookupResult.GetNextUnusedSRV();
int lookupPort = (nextSRVRecord != null) ? nextSRVRecord.Port : port;
return(DNSARecordLookup(nextSRVRecord, host, lookupPort, async, sipLookupResult.URI));
//}
}
}
}
catch (Exception excp)
{
logger.Error("Exception SIPDNSManager ResolveSIPService (" + sipURI.ToString() + "). " + excp.Message);
m_inProgressSIPServiceLookups.Remove(sipURI.ToString());
return(new SIPDNSLookupResult(sipURI, excp.Message));
}
}
public static void DNSSRVRecordLookup(SIPSchemesEnum scheme, SIPProtocolsEnum protocol, string host, bool async, ref SIPDNSLookupResult lookupResult)
{
SIPServicesEnum reqdNAPTRService = SIPServicesEnum.none;
if (scheme == SIPSchemesEnum.sip && protocol == SIPProtocolsEnum.udp)
{
reqdNAPTRService = SIPServicesEnum.sipudp;
}
else if (scheme == SIPSchemesEnum.sip && protocol == SIPProtocolsEnum.tcp)
{
reqdNAPTRService = SIPServicesEnum.siptcp;
}
else if (scheme == SIPSchemesEnum.sips && protocol == SIPProtocolsEnum.tcp)
{
reqdNAPTRService = SIPServicesEnum.sipstcp;
}
else if (scheme == SIPSchemesEnum.sip && protocol == SIPProtocolsEnum.tls)
{
reqdNAPTRService = SIPServicesEnum.siptls;
}
// If there are NAPTR records available see if there is a matching one for the SIP scheme and protocol required.
SIPDNSServiceResult naptrService = null;
if (lookupResult.SIPNAPTRResults != null && lookupResult.SIPNAPTRResults.Count > 0)
{
if (reqdNAPTRService != SIPServicesEnum.none && lookupResult.SIPNAPTRResults.ContainsKey(reqdNAPTRService))
{
naptrService = lookupResult.SIPNAPTRResults[reqdNAPTRService];
}
}
// Construct the SRV target to lookup depending on whether an NAPTR record was available or not.
string srvLookup = null;
if (naptrService != null)
{
srvLookup = naptrService.Data;
}
else
{
if (scheme == SIPSchemesEnum.sips)
{
srvLookup = SIPDNSConstants.SRV_SIPS_TCP_QUERY_PREFIX + host;
}
else
{
srvLookup = "_" + scheme.ToString() + "._" + protocol.ToString() + "." + host;
}
}
SIPMonitorLogEvent(new SIPMonitorConsoleEvent(SIPMonitorServerTypesEnum.Unknown, SIPMonitorEventTypesEnum.DNS, "SIP DNS SRV record lookup requested for " + srvLookup + ".", null));
DNSResponse srvRecordResponse = DNSManager.Lookup(srvLookup, DNSQType.SRV, DNS_LOOKUP_TIMEOUT, null, true, async);
if (srvRecordResponse == null && async)
{
SIPMonitorLogEvent(new SIPMonitorConsoleEvent(SIPMonitorServerTypesEnum.Unknown, SIPMonitorEventTypesEnum.DNS, "SIP DNS SRV record lookup pending for " + srvLookup + ".", null));
lookupResult.Pending = true;
}
else if (srvRecordResponse.Timedout)
{
SIPMonitorLogEvent(new SIPMonitorConsoleEvent(SIPMonitorServerTypesEnum.Unknown, SIPMonitorEventTypesEnum.DNS, "SIP DNS SRV record lookup timed out for " + srvLookup + ".", null));
lookupResult.SRVTimedoutAt = DateTime.Now;
}
else if (srvRecordResponse.Error != null)
{
SIPMonitorLogEvent(new SIPMonitorConsoleEvent(SIPMonitorServerTypesEnum.Unknown, SIPMonitorEventTypesEnum.DNS, "SIP DNS SRV record lookup for " + srvLookup + " returned error of " + lookupResult.LookupError + ".", null));
}
else if (srvRecordResponse.Error == null && srvRecordResponse.RecordSRV != null && srvRecordResponse.RecordSRV.Length > 0)
{
foreach (RecordSRV srvRecord in srvRecordResponse.RecordSRV)
{
SIPDNSServiceResult sipSRVResult = new SIPDNSServiceResult(reqdNAPTRService, srvRecord.Priority, srvRecord.Weight, srvRecord.RR.TTL, srvRecord.Target, srvRecord.Port, DateTime.Now);
lookupResult.AddSRVResult(sipSRVResult);
SIPMonitorLogEvent(new SIPMonitorConsoleEvent(SIPMonitorServerTypesEnum.Unknown, SIPMonitorEventTypesEnum.DNS, "SIP DNS SRV record found for " + srvLookup + ", result " + srvRecord.Target + " " + srvRecord.Port + ".", null));
}
}
else
{
SIPMonitorLogEvent(new SIPMonitorConsoleEvent(SIPMonitorServerTypesEnum.Unknown, SIPMonitorEventTypesEnum.DNS, "SIP DNS no SRV records found for " + srvLookup + ".", null));
}
}
public static void DNSSRVRecordLookup(SIPSchemesEnum scheme, SIPProtocolsEnum protocol, string host, bool async, ref SIPDNSLookupResult lookupResult)
{
SIPServicesEnum reqdNAPTRService = SIPServicesEnum.none;
if (scheme == SIPSchemesEnum.sip && protocol == SIPProtocolsEnum.udp)
{
reqdNAPTRService = SIPServicesEnum.sipudp;
}
else if (scheme == SIPSchemesEnum.sip && protocol == SIPProtocolsEnum.tcp)
{
reqdNAPTRService = SIPServicesEnum.siptcp;
}
else if (scheme == SIPSchemesEnum.sips && protocol == SIPProtocolsEnum.tcp)
{
reqdNAPTRService = SIPServicesEnum.sipstcp;
}
//rj2 2018-10-17: this looks wrong, but the www says: if sips then protocol is _tcp not _tls
else if (scheme == SIPSchemesEnum.sips && protocol == SIPProtocolsEnum.tls)
{
reqdNAPTRService = SIPServicesEnum.sipstcp;
}
else if (scheme == SIPSchemesEnum.sip && protocol == SIPProtocolsEnum.tls)
{
reqdNAPTRService = SIPServicesEnum.siptls;
}
// If there are NAPTR records available see if there is a matching one for the SIP scheme and protocol required.
// this works best (only works) if protocol in sip-uri matches sip-service of NAPTRRecord
SIPDNSServiceResult naptrService = null;
if (lookupResult.SIPNAPTRResults != null && lookupResult.SIPNAPTRResults.Count > 0)
{
if (reqdNAPTRService != SIPServicesEnum.none && lookupResult.SIPNAPTRResults.ContainsKey(reqdNAPTRService))
{
naptrService = lookupResult.SIPNAPTRResults[reqdNAPTRService];
}
}
// Construct the SRV target to lookup depending on whether an NAPTR record was available or not.
string srvLookup = null;
if (naptrService != null)
{
srvLookup = naptrService.Data;
}
else
{
if (scheme == SIPSchemesEnum.sips)
{
srvLookup = SIPDNSConstants.SRV_SIPS_TCP_QUERY_PREFIX + host;
}
else
{
srvLookup = "_" + scheme.ToString() + "._" + protocol.ToString() + "." + host;
}
}
SIPMonitorLogEvent(new SIPMonitorConsoleEvent(SIPMonitorServerTypesEnum.Unknown, SIPMonitorEventTypesEnum.DNS, "SIP DNS SRV record lookup requested for " + srvLookup + ".", null));
DNSResponse srvRecordResponse = DNSManager.Lookup(srvLookup, QType.SRV, DNS_LOOKUP_TIMEOUT, null, true, async);
if (srvRecordResponse == null && async)
{
SIPMonitorLogEvent(new SIPMonitorConsoleEvent(SIPMonitorServerTypesEnum.Unknown, SIPMonitorEventTypesEnum.DNS, "SIP DNS SRV record lookup pending for " + srvLookup + ".", null));
lookupResult.Pending = true;
}
else if (srvRecordResponse.Timedout)
{
SIPMonitorLogEvent(new SIPMonitorConsoleEvent(SIPMonitorServerTypesEnum.Unknown, SIPMonitorEventTypesEnum.DNS, "SIP DNS SRV record lookup timed out for " + srvLookup + ".", null));
lookupResult.SRVTimedoutAt = DateTime.Now;
}
else if (!string.IsNullOrWhiteSpace(srvRecordResponse.Error))
{
SIPMonitorLogEvent(new SIPMonitorConsoleEvent(SIPMonitorServerTypesEnum.Unknown, SIPMonitorEventTypesEnum.DNS, "SIP DNS SRV record lookup for " + srvLookup + " returned error of " + lookupResult.LookupError + ".", null));
}
else if (string.IsNullOrWhiteSpace(srvRecordResponse.Error) && srvRecordResponse.RecordSRV != null && srvRecordResponse.RecordSRV.Length > 0)
{
foreach (RecordSRV srvRecord in srvRecordResponse.RecordSRV)
{
SIPDNSServiceResult sipSRVResult = new SIPDNSServiceResult(reqdNAPTRService, srvRecord.PRIORITY, srvRecord.WEIGHT, srvRecord.RR.TTL, srvRecord.TARGET, srvRecord.PORT, DateTime.Now);
lookupResult.AddSRVResult(sipSRVResult);
SIPMonitorLogEvent(new SIPMonitorConsoleEvent(SIPMonitorServerTypesEnum.Unknown, SIPMonitorEventTypesEnum.DNS, "SIP DNS SRV record found for " + srvLookup + ", result " + srvRecord.TARGET + " " + srvRecord.PORT + ".", null));
}
}
else
{
SIPMonitorLogEvent(new SIPMonitorConsoleEvent(SIPMonitorServerTypesEnum.Unknown, SIPMonitorEventTypesEnum.DNS, "SIP DNS no SRV records found for " + srvLookup + ".", null));
}
}
public static SIPDNSLookupResult DNSNameRecordLookup(string host, int port, bool async, SIPURI uri, SIPDNSLookupResult lookupResult = null, bool?preferIPv6 = null, int recursionLevel = 0)
{
SIPMonitorLogEvent(new SIPMonitorConsoleEvent(SIPMonitorServerTypesEnum.Unknown, SIPMonitorEventTypesEnum.DNS, "SIP DNS Name record lookup requested for " + host + ".", null));
SIPDNSLookupResult result = lookupResult ?? new SIPDNSLookupResult(uri);
result.LookupError = null;
if (UseANYLookups)
{
DNSResponse aRecordResponse = DNSManager.Lookup(host, QType.ANY, DNS_A_RECORD_LOOKUP_TIMEOUT, null, true, async);
if (aRecordResponse == null && async)
{
result.Pending = true;
}
else if (aRecordResponse == null)
{
}
else if (aRecordResponse.Timedout)
{
result.ATimedoutAt = DateTime.Now;
}
else if (!string.IsNullOrWhiteSpace(aRecordResponse.Error))
{
result.LookupError = aRecordResponse.Error;
}
else if ((aRecordResponse.RecordsAAAA == null || aRecordResponse.RecordsAAAA.Length == 0) && (aRecordResponse.RecordsA == null || aRecordResponse.RecordsA.Length == 0) && (aRecordResponse.RecordsCNAME == null || aRecordResponse.RecordsCNAME.Length == 0))
{
SIPMonitorLogEvent(new SIPMonitorConsoleEvent(SIPMonitorServerTypesEnum.Unknown, SIPMonitorEventTypesEnum.DNS, "SIP DNS no CNAME, A or AAAA records found for " + host + ".", null));
result.LookupError = "No CNAME, A or AAAA records found for " + host + ".";
}
else
{
if (preferIPv6 == null)
{
preferIPv6 = SIPDNSManager.PreferIPv6NameResolution;
}
foreach (RecordCNAME aRecord in aRecordResponse.RecordsCNAME)
{
//CNAME could be another CNAME or A/AAAA Record -> max 3 levels recursive name resolution
if (recursionLevel < 3)
{
SIPDNSLookupResult resultCName = DNSNameRecordLookup(aRecord.CNAME, port, async, uri, lookupResult, preferIPv6, recursionLevel + 1);
if (resultCName != null)
{
foreach (SIPDNSLookupEndPoint ep in resultCName.EndPointResults)
{
result.AddLookupResult(ep);
}
}
}
}
if (preferIPv6 == true)
{
SIPURI sipURI = result.URI;
foreach (RecordAAAA aRecord in aRecordResponse.RecordsAAAA)
{
SIPDNSLookupEndPoint sipLookupEndPoint = new SIPDNSLookupEndPoint(new SIPEndPoint(sipURI.Protocol, new IPEndPoint(aRecord.Address, port)), aRecord.RR.TTL);
result.AddLookupResult(sipLookupEndPoint);
SIPMonitorLogEvent(new SIPMonitorConsoleEvent(SIPMonitorServerTypesEnum.Unknown, SIPMonitorEventTypesEnum.DNS, "SIP DNS AAAA record found for " + host + ", result " + sipLookupEndPoint.LookupEndPoint.ToString() + ".", null));
}
foreach (RecordA aRecord in aRecordResponse.RecordsA)
{
SIPDNSLookupEndPoint sipLookupEndPoint = new SIPDNSLookupEndPoint(new SIPEndPoint(sipURI.Protocol, new IPEndPoint(aRecord.Address, port)), aRecord.RR.TTL);
result.AddLookupResult(sipLookupEndPoint);
SIPMonitorLogEvent(new SIPMonitorConsoleEvent(SIPMonitorServerTypesEnum.Unknown, SIPMonitorEventTypesEnum.DNS, "SIP DNS A record found for " + host + ", result " + sipLookupEndPoint.LookupEndPoint.ToString() + ".", null));
}
}
else
{
SIPURI sipURI = result.URI;
foreach (RecordA aRecord in aRecordResponse.RecordsA)
{
SIPDNSLookupEndPoint sipLookupEndPoint = new SIPDNSLookupEndPoint(new SIPEndPoint(sipURI.Protocol, new IPEndPoint(aRecord.Address, port)), aRecord.RR.TTL);
result.AddLookupResult(sipLookupEndPoint);
SIPMonitorLogEvent(new SIPMonitorConsoleEvent(SIPMonitorServerTypesEnum.Unknown, SIPMonitorEventTypesEnum.DNS, "SIP DNS A record found for " + host + ", result " + sipLookupEndPoint.LookupEndPoint.ToString() + ".", null));
}
foreach (RecordAAAA aRecord in aRecordResponse.RecordsAAAA)
{
SIPDNSLookupEndPoint sipLookupEndPoint = new SIPDNSLookupEndPoint(new SIPEndPoint(sipURI.Protocol, new IPEndPoint(aRecord.Address, port)), aRecord.RR.TTL);
result.AddLookupResult(sipLookupEndPoint);
SIPMonitorLogEvent(new SIPMonitorConsoleEvent(SIPMonitorServerTypesEnum.Unknown, SIPMonitorEventTypesEnum.DNS, "SIP DNS AAAA record found for " + host + ", result " + sipLookupEndPoint.LookupEndPoint.ToString() + ".", null));
}
}
}
}
if (result.LookupError != null || result.EndPointResults == null || result.EndPointResults.Count == 0)
{
if (preferIPv6 == true)
{
result = DNSAAAARecordLookup(host, port, async, uri, lookupResult);
}
else
{
result = DNSARecordLookup(host, port, async, uri, lookupResult);
}
}
return(result);
}
// TODO: Remove this nasty code duplication with ResolveSIPService!
public static async Task <SIPDNSLookupResult> ResolveAsync(SIPURI sipURI, bool?preferIPv6 = null)
{
try
{
if (sipURI == null)
{
throw new ArgumentNullException("sipURI", "Cannot resolve SIP service on a null URI.");
}
if (IPSocket.TryParseIPEndPoint(sipURI.MAddrOrHost, out var ipEndPoint))
{
// Target is an IP address, no DNS lookup required.
SIPDNSLookupEndPoint sipLookupEndPoint = new SIPDNSLookupEndPoint(new SIPEndPoint(sipURI.Protocol, ipEndPoint), 0);
SIPDNSLookupResult result = new SIPDNSLookupResult(sipURI);
result.AddLookupResult(sipLookupEndPoint);
return(result);
}
else
{
string host = sipURI.MAddrOrHostAddress;
//int port = IPSocket.ParsePortFromSocket(host);
int port = sipURI.Protocol != SIPProtocolsEnum.tls ? m_defaultSIPPort : m_defaultSIPSPort;
if (preferIPv6 == null)
{
preferIPv6 = SIPDNSManager.PreferIPv6NameResolution;
}
bool explicitPort = false;
try
{
//Parse returns true if sipURI.Host can be parsed as an ipaddress
bool parseresult = SIPSorcery.Sys.IPSocket.Parse(sipURI.MAddrOrHost, out host, out port);
explicitPort = port >= 0;
if (!explicitPort)
{
//port = (sipURI.Scheme == SIPSchemesEnum.sip) ? m_defaultSIPPort : m_defaultSIPSPort;
port = sipURI.Protocol != SIPProtocolsEnum.tls ? m_defaultSIPPort : m_defaultSIPSPort;
}
if (parseresult == true)
{
IPAddress hostIP = IPAddress.Parse(host);
SIPDNSLookupEndPoint sipLookupEndPoint = new SIPDNSLookupEndPoint(new SIPEndPoint(sipURI.Protocol, new IPEndPoint(hostIP, port)), 0);
SIPDNSLookupResult result = new SIPDNSLookupResult(sipURI);
result.AddLookupResult(sipLookupEndPoint);
return(result);
}
}
catch (Exception ex)
{
SIPMonitorLogEvent(new SIPMonitorConsoleEvent(SIPMonitorServerTypesEnum.Unknown, SIPMonitorEventTypesEnum.DNS, "Exception SIPDNSManager ResolveSIPService (" + sipURI.ToString() + "). " + ex, null));
//rj2: if there is a parsing exception, then fallback to original sipsorcery parsing mechanism
port = IPSocket.ParsePortFromSocket(sipURI.Host);
explicitPort = port > 0;
//if(Regex.Match(host, @"^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$").Success)
if (SIPSorcery.Sys.IPSocket.IsIPAddress(host))
{
// Target is an IP address, no DNS lookup required.
IPAddress hostIP = IPAddress.Parse(host);
SIPDNSLookupEndPoint sipLookupEndPoint = new SIPDNSLookupEndPoint(new SIPEndPoint(sipURI.Protocol, new IPEndPoint(hostIP, port)), 0);
SIPDNSLookupResult result = new SIPDNSLookupResult(sipURI);
result.AddLookupResult(sipLookupEndPoint);
return(result);
}
}
if (!explicitPort)
{
//port = (sipURI.Scheme == SIPSchemesEnum.sip) ? m_defaultSIPPort : m_defaultSIPSPort;
port = sipURI.Protocol != SIPProtocolsEnum.tls ? m_defaultSIPPort : m_defaultSIPSPort;
}
if (host.Contains(".") == false || IPSocket.ParseHostFromSocket(host).EndsWith(MDNS_TLD))
{
string hostOnly = IPSocket.ParseHostFromSocket(host);
// If host is not fully qualified then assume there's no point using NAPTR or SRV record look ups and go straight to A's.
if (hostOnly.ToLower() == System.Net.Dns.GetHostName()?.ToLower())
{
// The lookup is for the current machine.
var addressList = System.Net.Dns.GetHostEntry(System.Net.Dns.GetHostName()).AddressList;
if (addressList?.Length == 0)
{
return(new SIPDNSLookupResult(sipURI, $"Failed to resolve local machine hostname."));
}
else
{
// Preference for IPv4 IP address for local host name lookup.
IPAddress firstAddress = addressList.Where(x => x.AddressFamily == (preferIPv6 == true ? AddressFamily.InterNetworkV6 : AddressFamily.InterNetwork)).FirstOrDefault() ?? addressList.FirstOrDefault();
SIPEndPoint resultEp = new SIPEndPoint(sipURI.Protocol, new IPEndPoint(firstAddress, port));
return(new SIPDNSLookupResult(sipURI, resultEp));
}
}
else
{
return(await Task.Run(() => DNSNameRecordLookup(hostOnly, port, false, sipURI, null, preferIPv6)).ConfigureAwait(false));
}
}
else if (explicitPort)
{
// If target is a hostname with an explicit port then SIP lookup rules state to use DNS lookup for A or AAAA record.
host = host.Substring(0, host.LastIndexOf(':'));
return(await Task.Run(() => DNSNameRecordLookup(host, port, false, sipURI, null, preferIPv6)).ConfigureAwait(false));
}
else
{
// Target is a hostname with no explicit port, use the whole NAPTR->SRV->A lookup procedure.
SIPDNSLookupResult sipLookupResult = new SIPDNSLookupResult(sipURI);
// Do without the NAPTR lookup for the time being. Very few organisations appear to use them and it can cost up to 2.5s to get a failed resolution.
//rj2: uncomment this section for telekom 1TR118 lookup
SIPMonitorLogEvent(new SIPMonitorConsoleEvent(SIPMonitorServerTypesEnum.Unknown, SIPMonitorEventTypesEnum.DNS, "SIP DNS full lookup requested for " + sipURI.ToString() + ".", null));
DNSNAPTRRecordLookup(host, false, ref sipLookupResult);
if (sipLookupResult.Pending)
{
if (!m_inProgressSIPServiceLookups.Contains(sipURI.ToString()))
{
m_inProgressSIPServiceLookups.Add(sipURI.ToString());
//ThreadPool.QueueUserWorkItem(delegate { ResolveSIPService(sipURI, false); });
System.Threading.ThreadPool.QueueUserWorkItem((obj) => ResolveSIPService(sipURI, false, preferIPv6));
}
return(sipLookupResult);
}
return(await Task.Run(() =>
{
DNSSRVRecordLookup(sipURI.Scheme, sipURI.Protocol, host, false, ref sipLookupResult);
if (sipLookupResult.Pending)
{
//logger.LogDebug("SIPDNSManager SRV lookup for " + host + " is pending.");
return sipLookupResult;
}
else
{
//logger.LogDebug("SIPDNSManager SRV lookup for " + host + " is final.");
// Add some custom logic to cope with sips SRV records using _sips._tcp (e.g. free.call.ciscospark.com).
// By default only _sips._tls SRV records are checked for. THis block adds an additional check for _sips._tcp SRV records.
//if ((sipLookupResult.SIPSRVResults == null || sipLookupResult.SIPSRVResults.Count == 0) && sipURI.Scheme == SIPSchemesEnum.sips)
//{
// DNSSRVRecordLookup(sipURI.Scheme, SIPProtocolsEnum.tcp, host, async, ref sipLookupResult);
// SIPDNSServiceResult nextSRVRecord = sipLookupResult.GetNextUnusedSRV();
// int lookupPort = (nextSRVRecord != null) ? nextSRVRecord.Port : port;
// return DNSARecordLookup(nextSRVRecord, host, lookupPort, async, sipLookupResult.URI);
//}
//else
//{
// SIPDNSServiceResult nextSRVRecord = sipLookupResult.GetNextUnusedSRV();
// int lookupPort = (nextSRVRecord != null) ? nextSRVRecord.Port : port;
// return DNSARecordLookup(nextSRVRecord, host, lookupPort, false, sipLookupResult.URI);
//}
// The SRV record can indicate the SIP server is using a non-standard port.
SIPDNSServiceResult nextSRVRecord = sipLookupResult.GetNextUnusedSRV();
int lookupPort = (nextSRVRecord != null) ? nextSRVRecord.Port : port;
return DNSNameRecordLookup(host, lookupPort, false, sipLookupResult.URI, ref sipLookupResult, preferIPv6);
}
}).ConfigureAwait(false));
}
}
}
catch (Exception excp)
{
logger.LogError("Exception SIPDNSManager ResolveSIPService (" + sipURI.ToString() + "). " + excp.Message);
m_inProgressSIPServiceLookups.Remove(sipURI.ToString());
return(new SIPDNSLookupResult(sipURI, excp.Message));
}
}
public static SIPDNSLookupResult ResolveSIPService(SIPURI sipURI, bool async)
{
try
{
if (sipURI == null)
{
throw new ArgumentNullException("sipURI", "Cannot resolve SIP service on a null URI.");
}
if (IPSocket.TryParseIPEndPoint(sipURI.Host, out var ipEndPoint))
{
// Target is an IP address, no DNS lookup required.
SIPDNSLookupEndPoint sipLookupEndPoint = new SIPDNSLookupEndPoint(new SIPEndPoint(sipURI.Protocol, ipEndPoint), 0);
SIPDNSLookupResult result = new SIPDNSLookupResult(sipURI);
result.AddLookupResult(sipLookupEndPoint);
return(result);
}
else
{
string host = sipURI.Host;
int port = IPSocket.ParsePortFromSocket(sipURI.Host);
bool explicitPort = (port != 0);
if (!explicitPort)
{
port = (sipURI.Scheme == SIPSchemesEnum.sip) ? m_defaultSIPPort : m_defaultSIPSPort;
}
if (host.Contains(".") == false)
{
string hostOnly = IPSocket.ParseHostFromSocket(host);
// If host is not fully qualified then assume there's no point using NAPTR or SRV record look ups and go straight to A's.
if (hostOnly.ToLower() == System.Net.Dns.GetHostName()?.ToLower())
{
// The lookup is for the current machine.
var addressList = System.Net.Dns.GetHostEntry(System.Net.Dns.GetHostName()).AddressList;
if (addressList?.Length == 0)
{
return(new SIPDNSLookupResult(sipURI, $"Failed to resolve local machine hostname."));
}
else
{
// Preference for IPv4 IP address for local host anem lookup.
IPAddress firstAddress = addressList.Where(x => x.AddressFamily == AddressFamily.InterNetwork).FirstOrDefault() ?? addressList.FirstOrDefault();
SIPEndPoint resultEp = new SIPEndPoint(sipURI.Protocol, new IPEndPoint(firstAddress, port));
return(new SIPDNSLookupResult(sipURI, resultEp));
}
}
else
{
return(DNSARecordLookup(hostOnly, port, async, sipURI));
}
}
else if (explicitPort)
{
// If target is a hostname with an explicit port then SIP lookup rules state to use DNS lookup for A or AAAA record.
host = host.Substring(0, host.LastIndexOf(':'));
return(DNSARecordLookup(host, port, async, sipURI));
}
else
{
// Target is a hostname with no explicit port, use the whole NAPTR->SRV->A lookup procedure.
SIPDNSLookupResult sipLookupResult = new SIPDNSLookupResult(sipURI);
// Do without the NAPTR lookup for the time being. Very few organisations appear to use them and it can cost up to 2.5s to get a failed resolution.
/*SIPMonitorLogEvent(new SIPMonitorConsoleEvent(SIPMonitorServerTypesEnum.Unknown, SIPMonitorEventTypesEnum.DNS, "SIP DNS full lookup requested for " + sipURI.ToString() + ".", null));
* DNSNAPTRRecordLookup(host, async, ref sipLookupResult);
* if (sipLookupResult.Pending)
* {
* if (!m_inProgressSIPServiceLookups.Contains(sipURI.ToString()))
* {
* m_inProgressSIPServiceLookups.Add(sipURI.ToString());
* ThreadPool.QueueUserWorkItem(delegate { ResolveSIPService(sipURI, false); });
* }
* return sipLookupResult;
* }*/
DNSSRVRecordLookup(sipURI.Scheme, sipURI.Protocol, host, async, ref sipLookupResult);
if (sipLookupResult.Pending)
{
//logger.LogDebug("SIPDNSManager SRV lookup for " + host + " is pending.");
return(sipLookupResult);
}
else
{
//logger.LogDebug("SIPDNSManager SRV lookup for " + host + " is final.");
// Add some custom logic to cope with sips SRV records using _sips._tcp (e.g. free.call.ciscospark.com).
// By default only _sips._tls SRV records are checked for. THis block adds an additional check for _sips._tcp SRV records.
//if ((sipLookupResult.SIPSRVResults == null || sipLookupResult.SIPSRVResults.Count == 0) && sipURI.Scheme == SIPSchemesEnum.sips)
//{
// DNSSRVRecordLookup(sipURI.Scheme, SIPProtocolsEnum.tcp, host, async, ref sipLookupResult);
// SIPDNSServiceResult nextSRVRecord = sipLookupResult.GetNextUnusedSRV();
// int lookupPort = (nextSRVRecord != null) ? nextSRVRecord.Port : port;
// return DNSARecordLookup(nextSRVRecord, host, lookupPort, async, sipLookupResult.URI);
//}
//else
//{
SIPDNSServiceResult nextSRVRecord = sipLookupResult.GetNextUnusedSRV();
int lookupPort = (nextSRVRecord != null) ? nextSRVRecord.Port : port;
return(DNSARecordLookup(nextSRVRecord, host, lookupPort, async, sipLookupResult.URI));
//}
}
}
}
}
catch (Exception excp)
{
logger.LogError("Exception SIPDNSManager ResolveSIPService (" + sipURI.ToString() + "). " + excp.Message);
m_inProgressSIPServiceLookups.Remove(sipURI.ToString());
return(new SIPDNSLookupResult(sipURI, excp.Message));
}
}