/// <summary>
/// Opens the physical connection to the server.
/// </summary>
/// <remarks>Usually called by the RequestConnector
/// Method of the connection pool manager.</remarks>
internal void Open()
{
ServerVersion = null;
// If Connection.ConnectionString specifies a protocol version, we will
// not try to fall back to version 2 on failure.
// Reset state to initialize new connector in pool.
CurrentState = NpgsqlClosedState.Instance;
// Get a raw connection, possibly SSL...
CurrentState.Open(this);
try
{
// Establish protocol communication and handle authentication...
CurrentState.Startup(this);
}
catch (NpgsqlException)
{
throw;
}
// Change the state of connection to open and ready.
State = ConnectionState.Open;
CurrentState = NpgsqlReadyState.Instance;
// Fall back to the old way, SELECT VERSION().
// This should not happen for protocol version 3+.
if (ServerVersion == null)
{
using (NpgsqlCommand command = new NpgsqlCommand("set DATESTYLE TO ISO;select version();", this))
{
ServerVersion = new Version(PGUtil.ExtractServerVersion((string)command.ExecuteScalar()));
}
}
StringBuilder sbInit = new StringBuilder();
// Adjust client encoding.
NpgsqlParameterStatus clientEncodingParam = null;
if (!ServerParameters.TryGetValue("client_encoding", out clientEncodingParam) ||
!string.Equals(clientEncodingParam.ParameterValue, "UTF8", StringComparison.OrdinalIgnoreCase) && !string.Equals(clientEncodingParam.ParameterValue, "UNICODE", StringComparison.OrdinalIgnoreCase))
{
sbInit.AppendLine("SET CLIENT_ENCODING TO UTF8;");
}
if (!string.IsNullOrEmpty(settings.SearchPath))
{
// TODO: Add proper message when finding a semicolon in search_path.
// This semicolon could lead to a sql injection security hole as someone could write in connection string:
// searchpath=public;delete from table; and it would be executed.
if (settings.SearchPath.Contains(";"))
{
throw new InvalidOperationException();
}
sbInit.AppendLine("SET SEARCH_PATH=" + settings.SearchPath + ";");
}
if (!string.IsNullOrEmpty(settings.ApplicationName))
{
if (!SupportsApplicationName)
{
//TODO
//throw new InvalidOperationException(resman.GetString("Exception_ApplicationNameNotSupported"));
throw new InvalidOperationException("ApplicationName not supported.");
}
if (settings.ApplicationName.Contains(";"))
{
throw new InvalidOperationException();
}
sbInit.AppendLine("SET APPLICATION_NAME='" + settings.ApplicationName.Replace('\'', '-') + "';");
}
/*
* Try to set SSL negotiation to 0. As of 2010-03-29, recent problems in SSL library implementations made
* postgresql to add a parameter to set a value when to do this renegotiation or 0 to disable it.
* Currently, Npgsql has a problem with renegotiation so, we are trying to disable it here.
* This only works on postgresql servers where the ssl renegotiation settings is supported of course.
* See http://lists.pgfoundry.org/pipermail/npgsql-devel/2010-February/001065.html for more information.
*/
sbInit.AppendLine("SET ssl_renegotiation_limit=0;");
/*
* Set precision digits to maximum value possible. For postgresql before 9 it was 2, after that, it is 3.
* This way, we set first to 2 and then to 3. If there is an error because of 3, it will have been set to 2 at least.
* Check bug report #1010992 for more information.
*/
sbInit.AppendLine("SET extra_float_digits=3;");
try
{
new NpgsqlCommand(sbInit.ToString(), this).ExecuteBlind();
}
catch
{
foreach (var line in sbInit.ToString().Split(Environment.NewLine.ToCharArray()))
{
try
{
if (line.Length > 0)
{
new NpgsqlCommand(line, this).ExecuteBlind();
}
}
catch { }
}
}
// Make a shallow copy of the type mapping that the connector will own.
// It is possible that the connector may add types to its private
// mapping that will not be valid to another connector, even
// if connected to the same backend version.
_oidToNameMapping = NpgsqlTypesHelper.CreateAndLoadInitialTypesMapping(this).Clone();
ProcessServerVersion();
// The connector is now fully initialized. Beyond this point, it is
// safe to release it back to the pool rather than closing it.
IsInitialized = true;
}