public DnsAnswer QueryServer(RecordType recType, int timeout)
{
if (_dnsServer == null)
throw new DnsQueryException("There is no Dns server set in Dns Query Component", null);
if (!ValidRecordType(recType))
throw new DnsQueryException("Invalid Record Type submitted to Dns Query Component", null);
//Result object
DnsAnswer res = null;
//UDP being unreliable we may need to try multiple times
//therefore we count how many times we have tried
_numTries = 0;
//as per RFC 1035 there is a max size on the dns response
byte[] dnsResponse = new byte[512];
Exception[] exceptions = new Exception[MAX_TRIES];
while (_numTries < MAX_TRIES)
{
try
{
CreateDnsQuery(recType);
_reqSocket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
_reqSocket.ReceiveTimeout = timeout;
_reqSocket.SendTo(_query, _query.Length, SocketFlags.None, _dnsServer);
_reqSocket.Receive(dnsResponse);
if (dnsResponse[0] == _query[0] && dnsResponse[1] == _query[1])
//this is our response so format and return the answer to the query
res = new DnsAnswer(dnsResponse);
_numTries++;
if (res.ReturnCode == ReturnCode.Success)
return res;
}
catch (SocketException ex)
{
exceptions[_numTries] = ex;
_numTries++;
_reqId++;
if (_numTries > MAX_TRIES)
throw new DnsQueryException("Failure Querying DNS Server", exceptions);
}
finally
{
_reqId++;
_reqSocket.Close();
Query = null; //Force a new message be built
}
}
return res;
}
public DnsAnswer QueryServer(RecordType recType, int timeout)
{
if (_dnsServer == null)
{
throw new DnsQueryException("There is no Dns server set in Dns Query Component", null);
}
if (!ValidRecordType(recType))
{
throw new DnsQueryException("Invalid Record Type submitted to Dns Query Component", null);
}
//Result object
DnsAnswer res = null;
//UDP being unreliable we may need to try multiple times
//therefore we count how many times we have tried
_numTries = 0;
//as per RFC 1035 there is a max size on the dns response
byte[] dnsResponse = new byte[512];
Exception[] exceptions = new Exception[MAX_TRIES];
while (_numTries < MAX_TRIES)
{
try
{
CreateDnsQuery(recType);
_reqSocket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
_reqSocket.ReceiveTimeout = timeout;
_reqSocket.SendTo(_query, _query.Length, SocketFlags.None, _dnsServer);
_reqSocket.Receive(dnsResponse);
if (dnsResponse[0] == _query[0] && dnsResponse[1] == _query[1])
{
//this is our response so format and return the answer to the query
res = new DnsAnswer(dnsResponse);
}
_numTries++;
if (res.ReturnCode == ReturnCode.Success)
{
return(res);
}
}
catch (SocketException ex)
{
exceptions[_numTries] = ex;
_numTries++;
_reqId++;
if (_numTries > MAX_TRIES)
{
throw new DnsQueryException("Failure Querying DNS Server", exceptions);
}
}
finally
{
_reqId++;
_reqSocket.Close();
Query = null; //Force a new message be built
}
}
return(res);
}
