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);
}
private static void ProcessLookups()
{
string hostname = null;
try
{
string threadName = Thread.CurrentThread.Name;
//logger.LogDebug("DNS Lookup Thread " + threadName + " started.");
while (!m_close)
{
int lookups = 0;
while (m_queuedLookups.Count > 0 && !m_close)
{
LookupRequest lookupRequest = LookupRequest.Empty;
string queryType = null;
//string hostname = null;
DNSResponse dnsResponse = null;
DateTime startLookupTime = DateTime.Now;
try
{
lock (m_queuedLookups)
{
if (m_queuedLookups.Count > 0)
{
lookupRequest = m_queuedLookups.Dequeue();
hostname = lookupRequest.Hostname;
queryType = lookupRequest.QueryType.ToString();
}
else
{
// Another thread got in ahead of this one to do the lookup.
continue;
}
}
lookups++;
logger.LogDebug("DNSManager thread " + threadName + " looking up " + queryType + " " + lookupRequest.Hostname + ".");
//dnsEntry = new DNSEntry(hostname);
//dnsEntry.LastLookup = DateTime.Now;
//IPHostEntry ipHostEntry = Dns.GetHostEntry(hostname);
if (lookupRequest.DNSServers == null)
{
dnsResponse = m_resolver.Query(lookupRequest.Hostname, lookupRequest.QueryType, lookupRequest.Timeout);
}
else
{
dnsResponse = m_resolver.Query(lookupRequest.Hostname, lookupRequest.QueryType, lookupRequest.Timeout, lookupRequest.DNSServers);
}
if (dnsResponse == null)
{
logger.LogWarning("DNSManager resolution error for " + lookupRequest.QueryType + " " + lookupRequest.Hostname + " no response was returned. Time taken=" + DateTime.Now.Subtract(startLookupTime).TotalMilliseconds.ToString("0.##") + "ms.");
}
else if (dnsResponse.Error != null)
{
logger.LogWarning("DNSManager resolution error for " + lookupRequest.QueryType + " " + lookupRequest.Hostname + ". " + dnsResponse.Error + ". Time taken=" + DateTime.Now.Subtract(startLookupTime).TotalMilliseconds.ToString("0.##") + "ms.");
}
else if (lookupRequest.QueryType == QType.A)
{
if (dnsResponse?.RecordsA.Length > 0)
{
logger.LogDebug($"DNSManager resolved A record for {lookupRequest.Hostname} to {dnsResponse.RecordsA[0].Address.ToString()} with TTL {dnsResponse.RecordsA[0].RR.TTL} in {DateTime.Now.Subtract(startLookupTime).TotalMilliseconds.ToString("0.##")}ms.");
}
else
{
logger.LogWarning("DNSManager could not resolve A record for " + lookupRequest.Hostname + " in " + DateTime.Now.Subtract(startLookupTime).TotalMilliseconds.ToString("0.##") + "ms.");
}
}
else if (lookupRequest.QueryType == QType.AAAA)
{
if (dnsResponse?.RecordsAAAA.Length > 0)
{
logger.LogDebug($"DNSManager resolved AAAA record for {lookupRequest.Hostname} to {dnsResponse.RecordsAAAA[0].Address.ToString()} with TTL {dnsResponse.RecordsAAAA[0].RR.TTL} in {DateTime.Now.Subtract(startLookupTime).TotalMilliseconds.ToString("0.##")}ms.");
}
else
{
logger.LogWarning("DNSManager could not resolve AAAA record for " + lookupRequest.Hostname + " in " + DateTime.Now.Subtract(startLookupTime).TotalMilliseconds.ToString("0.##") + "ms.");
}
}
else if (lookupRequest.QueryType == QType.SRV)
{
logger.LogDebug("DNSManager resolve time for " + lookupRequest.Hostname + " " + lookupRequest.QueryType + " " + DateTime.Now.Subtract(startLookupTime).TotalMilliseconds.ToString("0.##") + "ms.");
if (dnsResponse.RecordsRR == null || dnsResponse.RecordsRR.Length == 0)
{
logger.LogDebug(" no SRV resource records found for " + lookupRequest.Hostname + ".");
}
else
{
foreach (RecordSRV srvRecord in dnsResponse.RecordSRV)
{
logger.LogDebug(" result: priority=" + srvRecord.PRIORITY + ", weight=" + srvRecord.WEIGHT + ", port=" + srvRecord.PORT + ", target=" + srvRecord.TARGET + ".");
}
}
}
else
{
logger.LogDebug("DNSManager resolve time for " + lookupRequest.Hostname + " " + lookupRequest.QueryType + " " + DateTime.Now.Subtract(startLookupTime).TotalMilliseconds.ToString("0.##") + "ms.");
}
}
catch (Exception lookupExcp)
{
//dnsEntry.Unresolvable = true;
dnsResponse.Error = "Exception lookup. " + lookupExcp.Message;
logger.LogError("Exception DNSManager ProcessLookups Lookup (thread, " + threadName + ", hostname=" + hostname + "). " + lookupExcp.GetType().ToString() + "-" + lookupExcp.Message);
}
finally
{
try
{
if (dnsResponse != null)
{
if (lookupRequest.CompleteEvent != null)
{
lookupRequest.CompleteEvent.Set();
}
// Mark any requests for the same hostname complete and fire the completed lookup event where required.
if (lookupRequest.Duplicates != null)
{
foreach (LookupRequest duplicateRequest in lookupRequest.Duplicates)
{
duplicateRequest.CompleteEvent.Set();
}
}
}
lock (m_inProgressLookups)
{
m_inProgressLookups.Remove(lookupRequest);
}
}
catch (Exception excp)
{
logger.LogError("Exception DNSManager ProcessLookup Adding DNS Response. " + excp.Message);
}
}
}
// No more lookups outstanding, put thread to sleep until a new lookup is required.
m_lookupARE.WaitOne();
}
//logger.LogDebug("Thread " + threadName + " shutdown.");
}
catch (Exception excp)
{
logger.LogError("Exception DNSManager ProcessLookups. " + excp.Message);
}
finally
{
if (m_close)
{
m_lookupARE.Set();
}
//logger.LogDebug("DNSManager thread shutdown.");
}
}
public static DNSResponse Lookup(string hostname, QType queryType, int timeout, List <IPEndPoint> dnsServers, bool useCache, bool async)
{
if (hostname == null || hostname.Trim().Length == 0)
{
return(null);
}
DNSResponse ipAddressResult = MatchIPAddress(hostname);
if (ipAddressResult != null)
{
return(ipAddressResult);
}
else if (useCache)
{
DNSResponse cacheResult = m_resolver.QueryCache(hostname.Trim().ToLower(), queryType);
if (cacheResult != null)
{
return(cacheResult);
}
}
if (async)
{
//logger.LogDebug("DNS lookup cache miss for async lookup to " + queryType.ToString() + " " + hostname + ".");
QueueLookup(new LookupRequest(hostname.Trim().ToLower(), queryType, timeout, dnsServers, null));
return(null);
}
else
{
ManualResetEvent completeEvent = new ManualResetEvent(false);
QueueLookup(new LookupRequest(hostname.Trim().ToLower(), queryType, timeout, dnsServers, completeEvent));
if (completeEvent.WaitOne(timeout * 1000 * 2, false))
{
//logger.LogDebug("Complete event fired for DNS lookup on " + queryType.ToString() + " " + hostname + ".");
// Completed event was fired, the DNS entry will now be in cache.
DNSResponse result = m_resolver.QueryCache(hostname, queryType);
if (result != null)
{
return(result);
}
else
{
//logger.LogDebug("DNS lookup cache miss for " + queryType.ToString() + " " + hostname + ".");
// Timeout.
DNSResponse timeoutResponse = new DNSResponse();
timeoutResponse.Timedout = true;
return(timeoutResponse);
}
}
else
{
// If this block gets called it's because the DNS resolver class did not return within twice the timeout period it
// was asked to do so in. If this happens a lot further investigation into the DNS resolver class is warranted.
logger.LogError("DNSManager timed out waiting for the DNS resolver to complete the lookup for " + queryType.ToString() + " " + hostname + ".");
// Timeout.
DNSResponse timeoutResponse = new DNSResponse();
timeoutResponse.Timedout = true;
return(timeoutResponse);
}
}
}
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));
}
}
private static void ProcessLookups()
{
string hostname = null;
try
{
string threadName = Thread.CurrentThread.Name;
//logger.LogDebug("DNS Lookup Thread " + threadName + " started.");
while (!m_close)
{
int lookups = 0;
while (m_queuedLookups.Count > 0 && !m_close)
{
LookupRequest lookupRequest = LookupRequest.Empty;
string queryType = null;
//string hostname = null;
DNSResponse dnsResponse = null;
DateTime startLookupTime = DateTime.Now;
try
{
if (m_queuedLookups.Count > 0)
{
if (m_queuedLookups.TryDequeue(out lookupRequest))
{
hostname = lookupRequest.Hostname;
queryType = lookupRequest.QueryType.ToString();
}
}
else
{
// Another thread got in ahead of this one to do the lookup.
continue;
}
lookups++;
Logger.Logger.Debug("DNSManager thread " + threadName + " looking up " + queryType + " " +
lookupRequest.Hostname + ".");
if (lookupRequest.DNSServers == null)
{
dnsResponse = m_resolver.Query(lookupRequest.Hostname, lookupRequest.QueryType,
lookupRequest.Timeout);
}
else
{
dnsResponse = m_resolver.Query(lookupRequest.Hostname, lookupRequest.QueryType,
lookupRequest.Timeout, lookupRequest.DNSServers);
}
bool bDnsErr = false;
if (dnsResponse == null)
{
Logger.Logger.Warn("DNSManager resolution error for " + lookupRequest.QueryType + " " +
lookupRequest.Hostname + " no response was returned. Time taken=" +
DateTime.Now.Subtract(startLookupTime).TotalMilliseconds + "ms.");
bDnsErr = true;
}
else if (!string.IsNullOrWhiteSpace(dnsResponse.Error))
{
Logger.Logger.Warn("DNSManager resolution error for " + lookupRequest.QueryType + " " +
lookupRequest.Hostname + ". " + dnsResponse.Error + ". Time taken=" +
DateTime.Now.Subtract(startLookupTime).TotalMilliseconds + "ms.");
bDnsErr = true;
}
//rj2: use default dns suffixes for address resolution
for (int iSuffix = 0;
iSuffix < GetDnsSuffixes().Length&& bDnsErr && UseDNSSuffixes &&
!m_close;
iSuffix++)
{
string host = lookupRequest.Hostname;
if (!host.EndsWith("."))
{
host += ".";
}
host += m_dnsSuffixes[iSuffix];
if (lookupRequest.DNSServers == null)
{
dnsResponse = m_resolver.Query(host, lookupRequest.QueryType,
lookupRequest.Timeout);
}
else
{
dnsResponse = m_resolver.Query(host, lookupRequest.QueryType, lookupRequest.Timeout,
lookupRequest.DNSServers);
}
bDnsErr = false;
if (dnsResponse == null)
{
Logger.Logger.Warn("DNSManager resolution error for " + lookupRequest.QueryType +
" " + host + " no response was returned. Time taken=" +
DateTime.Now.Subtract(startLookupTime).TotalMilliseconds +
"ms.");
bDnsErr = true;
}
else if (!string.IsNullOrWhiteSpace(dnsResponse.Error))
{
Logger.Logger.Warn("DNSManager resolution error for " + lookupRequest.QueryType +
" " + host + ". " + dnsResponse.Error + ". Time taken=" +
DateTime.Now.Subtract(startLookupTime).TotalMilliseconds +
"ms.");
bDnsErr = true;
}
}
if (bDnsErr)
{
}
else if (lookupRequest.QueryType == QType.A)
{
if (dnsResponse?.RecordsA.Length > 0)
{
Logger.Logger.Debug(
$"DNSManager resolved A record for {lookupRequest.Hostname} to {dnsResponse.RecordsA[0].Address.ToString()} with TTL {dnsResponse.RecordsA[0].RR.TTL} in {DateTime.Now.Subtract(startLookupTime).TotalMilliseconds.ToString("0.##")}ms.");
}
else
{
Logger.Logger.Warn("DNSManager could not resolve A record for " +
lookupRequest.Hostname + " in " +
DateTime.Now.Subtract(startLookupTime).TotalMilliseconds
.ToString("0.##") + "ms.");
}
}
else if (lookupRequest.QueryType == QType.AAAA)
{
if (dnsResponse?.RecordsAAAA.Length > 0)
{
Logger.Logger.Debug(
$"DNSManager resolved AAAA record for {lookupRequest.Hostname} to {dnsResponse.RecordsAAAA[0].Address.ToString()} with TTL {dnsResponse.RecordsAAAA[0].RR.TTL} in {DateTime.Now.Subtract(startLookupTime).TotalMilliseconds.ToString("0.##")}ms.");
}
else
{
Logger.Logger.Warn("DNSManager could not resolve AAAA record for " +
lookupRequest.Hostname + " in " +
DateTime.Now.Subtract(startLookupTime).TotalMilliseconds
.ToString("0.##") + "ms.");
}
}
else if (lookupRequest.QueryType == QType.SRV)
{
Logger.Logger.Debug("DNSManager resolve time for " + lookupRequest.Hostname + " " +
lookupRequest.QueryType + " " +
DateTime.Now.Subtract(startLookupTime).TotalMilliseconds
.ToString("0.##") + "ms.");
if (dnsResponse.RecordsRR == null || dnsResponse.RecordsRR.Length == 0)
{
Logger.Logger.Debug(
" no SRV resource records found for " + lookupRequest.Hostname + ".");
}
else
{
foreach (RecordSRV srvRecord in dnsResponse.RecordSRV)
{
Logger.Logger.Debug(" result: priority=" + srvRecord.PRIORITY + ", weight=" +
srvRecord.WEIGHT + ", port=" + srvRecord.PORT +
", target=" +
srvRecord.TARGET + ".");
}
}
}
else
{
Logger.Logger.Debug("DNSManager resolve time for " + lookupRequest.Hostname + " " +
lookupRequest.QueryType + " " +
DateTime.Now.Subtract(startLookupTime).TotalMilliseconds
.ToString("0.##") + "ms.");
}
}
catch (Exception lookupExcp)
{
//dnsEntry.Unresolvable = true;
dnsResponse.Error = "Exception lookup. " + lookupExcp.Message;
Logger.Logger.Error("Exception DNSManager ProcessLookups Lookup (thread, " + threadName +
", hostname=" + hostname + "). ->" + lookupExcp.GetType().ToString() +
"-" +
lookupExcp.Message);
}
finally
{
try
{
if (dnsResponse != null)
{
if (lookupRequest.CompleteEvent != null)
{
lookupRequest.CompleteEvent.Set();
}
// Mark any requests for the same hostname complete and fire the completed lookup event where required.
if (lookupRequest.Duplicates != null)
{
foreach (LookupRequest duplicateRequest in lookupRequest.Duplicates)
{
duplicateRequest.CompleteEvent.Set();
}
}
}
LookupRequest lr;
m_inProgressLookups.TryRemove(lookupRequest.id(), out lr);
}
catch (Exception excp)
{
Logger.Logger.Error("Exception DNSManager ProcessLookup Adding DNS Response. ->" +
excp.Message);
}
}
}
// No more lookups outstanding, put thread to sleep until a new lookup is required.
m_lookupARE.WaitOne();
}
//logger.LogDebug("Thread " + threadName + " shutdown.");
}
catch (Exception excp)
{
Logger.Logger.Error("Exception DNSManager ProcessLookups. ->" + excp.Message);
}
finally
{
if (m_close)
{
m_lookupARE.Set();
}
//logger.LogDebug("DNSManager thread shutdown.");
}
}
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));
}
}
