/// <summary>
/// Applies a set of NAPTR rules obtained from an ENUM lookup to attempt to get a SIP URI.
/// This functionality should be moved closer to the DNS classes once it becomes more mature and universal.
/// See RFC 2915.
/// </summary>
/// <param name="naptrRecords"></param>
/// <returns></returns>
private string ApplyENUMRules(string number, RecordNAPTR[] naptrRecords)
{
try
{
RecordNAPTR priorityRecord = null;
foreach (RecordNAPTR naptrRecord in naptrRecords)
{
if (naptrRecord.Service != null && naptrRecord.Service.ToUpper() == RecordNAPTR.SIP_SERVICE_KEY)
{
if (priorityRecord == null)
{
priorityRecord = naptrRecord;
}
else if (naptrRecord.Order < priorityRecord.Order)
{
priorityRecord = naptrRecord;
}
else if (naptrRecord.Order == priorityRecord.Order && naptrRecord.Preference < priorityRecord.Preference)
{
priorityRecord = naptrRecord;
}
}
}
if (priorityRecord != null && priorityRecord.Rule != null && Regex.Match(priorityRecord.Rule, "!.+!.+!").Success)
{
//logger.Debug("rule=" + priorityRecord.Rule + ".");
Match match = Regex.Match(priorityRecord.Rule, "!(?<pattern>.+?)!(?<substitute>.+?)!(?<options>.*)");
if (match.Success)
{
string pattern = match.Result("${pattern}");
//logger.Debug("pattern=" + pattern + ".");
string substitute = Regex.Replace(match.Result("${substitute}"), @"\\(?<digit>\d)", @"${${digit}}");
string options = match.Result("${options}");
logger.Debug("ENUM rule: s/" + pattern + "/" + substitute + "/" + options);
string domainlessNumber = number.Substring(0, number.IndexOf('.'));
Regex enumRegex = new Regex(pattern);
if (enumRegex.Match(domainlessNumber).Success)
{
//{
// Log("enum substitute /" + number + "/" + pattern + "/" + substitute + "/");
// return Regex.Replace(number, pattern, substitute);
//}
//else
//{
// Remove the domain from number and match.
Log("enum substitute /" + domainlessNumber + "/" + pattern + "/" + substitute + "/");
return Regex.Replace(domainlessNumber, pattern, substitute);
}
else if (enumRegex.Match("+" + domainlessNumber).Success)
{
// Remove the domain from number and match.
Log("enum substitute /+" + domainlessNumber + "/" + pattern + "/" + substitute + "/");
return Regex.Replace("+" + domainlessNumber, pattern, substitute);
}
}
else
{
logger.Warn("Priority rule for an ENUM lookup was not recognised: " + priorityRecord.Rule + ".");
}
}
return null;
}
catch (Exception excp)
{
logger.Error("Exception ApplyENUMRules. " + excp.Message);
return null;
}
}
public void AddNAPTRResult(RecordNAPTR naptrRecord)
{
//logger.Debug("Checking NAPTR record for " + URI.ToString() + " " + naptrRecord.ToString() + ".");
SIPServicesEnum sipServicesEnum = SIPServicesEnum.none;
if (naptrRecord.Service == SIPDNSManager.NAPTR_SIP_UDP_SERVICE)
{
sipServicesEnum = SIPServicesEnum.sipudp;
}
else if (naptrRecord.Service == SIPDNSManager.NAPTR_SIP_TCP_SERVICE)
{
sipServicesEnum = SIPServicesEnum.siptcp;
}
else if (naptrRecord.Service == SIPDNSManager.NAPTR_SIPS_TCP_SERVICE)
{
sipServicesEnum = SIPServicesEnum.sipstcp;
}
if(sipServicesEnum != SIPServicesEnum.none)
{
//logger.Debug(" adding NAPTR lookup result for " + URI.ToString() + " of " + naptrRecord.ToString() + ".");
SIPDNSServiceResult sipNAPTRResult = new SIPDNSServiceResult(sipServicesEnum, naptrRecord.Order, naptrRecord.RR.TTL, naptrRecord.Replacement, 0, DateTime.Now);
if (SIPNAPTRResults == null)
{
SIPNAPTRResults = new Dictionary<SIPServicesEnum, SIPDNSServiceResult>() { { sipServicesEnum, sipNAPTRResult } };
}
else
{
SIPNAPTRResults.Add(sipServicesEnum, sipNAPTRResult);
}
}
}
