/// <summary>
/// Quey a Dns Seerver for records of a specific type and timeout.
/// </summary>
/// <param name="recType"></param>
/// <param name="timeout"></param>
/// <returns></returns>
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);
#if !PocketPC
reqSocket.ReceiveTimeout = timeout;
#else
PPCSleep();
#endif
reqSocket.SendTo(query, query.Length, SocketFlags.None, dnsServer);
//#if !PocketPC
// reqSocket.ReceiveTimeout = timeout;
//#else
// PPCSleep();
//#endif
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
}
#if PocketPC
//PocketPC CF .NET's Socket does require a latency to Connect.
//.NET Sockets in 3.5 is improved, this will be taken out there.
PPCSleep();
#endif
}
return(res);
}
/// <summary>
/// Quey a Dns Seerver for records of a specific type and timeout.
/// </summary>
/// <param name="recType"></param>
/// <param name="timeout"></param>
/// <returns></returns>
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);
#if !PocketPC
reqSocket.ReceiveTimeout = timeout;
#else
PPCSleep();
#endif
reqSocket.SendTo(query, query.Length, SocketFlags.None, dnsServer);
//#if !PocketPC
// reqSocket.ReceiveTimeout = timeout;
//#else
// PPCSleep();
//#endif
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
}
#if PocketPC
//PocketPC CF .NET's Socket does require a latency to Connect.
//.NET Sockets in 3.5 is improved, this will be taken out there.
PPCSleep();
#endif
}
return res;
}
