/// <summary>
/// Create a SNI connection handle
/// </summary>
/// <param name="fullServerName">Full server name from connection string</param>
/// <param name="ignoreSniOpenTimeout">Ignore open timeout</param>
/// <param name="timerExpire">Timer expiration</param>
/// <param name="instanceName">Instance name</param>
/// <param name="spnBuffer">SPN</param>
/// <param name="flushCache">Flush packet cache</param>
/// <param name="async">Asynchronous connection</param>
/// <param name="parallel">Attempt parallel connects</param>
/// <param name="isIntegratedSecurity"></param>
/// <param name="ipPreference">IP address preference</param>
/// <param name="cachedFQDN">Used for DNS Cache</param>
/// <param name="pendingDNSInfo">Used for DNS Cache</param>
/// <returns>SNI handle</returns>
internal static SNIHandle CreateConnectionHandle(string fullServerName, bool ignoreSniOpenTimeout, long timerExpire, out byte[] instanceName, ref byte[][] spnBuffer,
bool flushCache, bool async, bool parallel, bool isIntegratedSecurity, SqlConnectionIPAddressPreference ipPreference, string cachedFQDN, ref SQLDNSInfo pendingDNSInfo)
{
instanceName = new byte[1];
bool errorWithLocalDBProcessing;
string localDBDataSource = GetLocalDBDataSource(fullServerName, out errorWithLocalDBProcessing);
if (errorWithLocalDBProcessing)
{
return(null);
}
// If a localDB Data source is available, we need to use it.
fullServerName = localDBDataSource ?? fullServerName;
DataSource details = DataSource.ParseServerName(fullServerName);
if (details == null)
{
return(null);
}
SNIHandle sniHandle = null;
switch (details._connectionProtocol)
{
case DataSource.Protocol.Admin:
case DataSource.Protocol.None: // default to using tcp if no protocol is provided
case DataSource.Protocol.TCP:
sniHandle = CreateTcpHandle(details, timerExpire, parallel, ipPreference, cachedFQDN, ref pendingDNSInfo);
break;
case DataSource.Protocol.NP:
sniHandle = CreateNpHandle(details, timerExpire, parallel);
break;
default:
Debug.Fail($"Unexpected connection protocol: {details._connectionProtocol}");
break;
}
if (isIntegratedSecurity)
{
try
{
spnBuffer = GetSqlServerSPNs(details);
}
catch (Exception e)
{
SNILoadHandle.SingletonInstance.LastError = new SNIError(SNIProviders.INVALID_PROV, SNICommon.ErrorSpnLookup, e);
}
}
SqlClientEventSource.Log.TryTraceEvent("SNIProxy.CreateConnectionHandle | Info | Session Id {0}, SNI Handle Type: {1}", sniHandle?.ConnectionId, sniHandle?.GetType());
return(sniHandle);
}