Exemplo n.º 1
0
        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);
        }
Exemplo n.º 2
0
        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));
            }
        }