private void SetConnectServerFromSRVRecords()
{
// check we have a response
if (_SRVRecords != null && _SRVRecords.Length > 0)
{
//SRVRecord srv = _SRVRecords[0];
_currentSRVRecord = PickSRVRecord();
this.Port = _currentSRVRecord.Port;
this.ConnectServer = _currentSRVRecord.Target;
}
else
{
// no SRV-Records set
_currentSRVRecord = null;
this.ConnectServer = null;
}
}
/// <summary>
/// Shorthand form to make SRV querying easier, essentially wraps up the retreival
/// of the SRV records, and sorts them by preference
/// </summary>
/// <param name="domain">domain name to retreive SRV RRs for</param>
/// <param name="dnsServer">the server we're going to ask</param>
/// <returns>An array of SRVRecords</returns>
public static SRVRecord[] SRVLookup(string domain, IPAddress dnsServer)
{
// check the inputs
if (domain == null) throw new ArgumentNullException("domain");
if (dnsServer == null) throw new ArgumentNullException("dnsServer");
// create a request for this
Request request = new Request();
// add one question - the SRV IN lookup for the supplied domain
request.AddQuestion(new Question(domain, DnsType.SRV, DnsClass.IN));
// fire it off
Response response = Lookup(request, dnsServer);
// if we didn't get a response, then return null
if (response == null) return null;
// create a growable array of SRV records
ArrayList resourceRecords = new ArrayList();
// add each of the answers to the array
foreach (Answer answer in response.Answers)
{
// if the answer is an SRV record
if (answer.Type == DnsType.SRV)
{
// add it to our array
resourceRecords.Add(answer.Record);
}
}
// create array of MX records
SRVRecord[] srvRecords = new SRVRecord[resourceRecords.Count];
// copy from the array list
resourceRecords.CopyTo(srvRecords);
// sort into lowest preference order
Array.Sort(srvRecords);
// and return
return srvRecords;
}
private void RemoveSrvRecord(SRVRecord rec)
{
int i = 0;
SRVRecord[] recs = new SRVRecord[_SRVRecords.Length - 1];
foreach (SRVRecord srv in _SRVRecords)
{
if (!srv.Equals(rec))
{
recs[i] = srv;
i++;
}
}
_SRVRecords = recs;
}
