public async Task ConnectAsync(ConnectionSettings cs, IOBehavior ioBehavior, CancellationToken cancellationToken)
{
lock (m_lock)
{
VerifyState(State.Created);
m_state = State.Connecting;
}
var connected = false;
if (cs.ConnectionType == ConnectionType.Tcp)
{
connected = await OpenTcpSocketAsync(cs, ioBehavior, cancellationToken).ConfigureAwait(false);
}
else if (cs.ConnectionType == ConnectionType.Unix)
{
connected = await OpenUnixSocketAsync(cs, ioBehavior, cancellationToken).ConfigureAwait(false);
}
if (!connected)
{
lock (m_lock)
m_state = State.Failed;
throw new MySqlException("Unable to connect to any of the specified MySQL hosts.");
}
var byteHandler = new SocketByteHandler(m_socket);
m_payloadHandler = new StandardPayloadHandler(byteHandler);
var payload = await ReceiveAsync(ioBehavior, cancellationToken).ConfigureAwait(false);
var reader = new ByteArrayReader(payload.ArraySegment.Array, payload.ArraySegment.Offset, payload.ArraySegment.Count);
var initialHandshake = new InitialHandshakePacket(reader);
// if PluginAuth is supported, then use the specified auth plugin; else, fall back to protocol capabilities to determine the auth type to use
string authPluginName;
if ((initialHandshake.ProtocolCapabilities & ProtocolCapabilities.PluginAuth) != 0)
{
authPluginName = initialHandshake.AuthPluginName;
}
else
{
authPluginName = (initialHandshake.ProtocolCapabilities & ProtocolCapabilities.SecureConnection) == 0 ? "mysql_old_password" : "mysql_native_password";
}
if (authPluginName != "mysql_native_password" && authPluginName != "sha256_password")
{
throw new NotSupportedException("Authentication method '{0}' is not supported.".FormatInvariant(initialHandshake.AuthPluginName));
}
ServerVersion = new ServerVersion(Encoding.ASCII.GetString(initialHandshake.ServerVersion));
ConnectionId = initialHandshake.ConnectionId;
AuthPluginData = initialHandshake.AuthPluginData;
m_useCompression = cs.UseCompression && (initialHandshake.ProtocolCapabilities & ProtocolCapabilities.Compress) != 0;
var serverSupportsSsl = (initialHandshake.ProtocolCapabilities & ProtocolCapabilities.Ssl) != 0;
if (cs.SslMode != MySqlSslMode.None && (cs.SslMode != MySqlSslMode.Preferred || serverSupportsSsl))
{
if (!serverSupportsSsl)
{
throw new MySqlException("Server does not support SSL");
}
await InitSslAsync(initialHandshake.ProtocolCapabilities, cs, ioBehavior, cancellationToken).ConfigureAwait(false);
}
m_supportsConnectionAttributes = (initialHandshake.ProtocolCapabilities & ProtocolCapabilities.ConnectionAttributes) != 0;
if (m_supportsConnectionAttributes && s_connectionAttributes == null)
{
s_connectionAttributes = CreateConnectionAttributes();
}
var response = HandshakeResponse41Packet.Create(initialHandshake, cs, m_useCompression, m_supportsConnectionAttributes ? s_connectionAttributes : null);
payload = new PayloadData(new ArraySegment <byte>(response));
await SendReplyAsync(payload, ioBehavior, cancellationToken).ConfigureAwait(false);
payload = await ReceiveReplyAsync(ioBehavior, cancellationToken).ConfigureAwait(false);
// if server doesn't support the authentication fast path, it will send a new challenge
if (payload.HeaderByte == AuthenticationMethodSwitchRequestPayload.Signature)
{
await SwitchAuthenticationAsync(cs, payload, ioBehavior, cancellationToken).ConfigureAwait(false);
payload = await ReceiveReplyAsync(ioBehavior, cancellationToken).ConfigureAwait(false);
}
OkPayload.Create(payload);
if (m_useCompression)
{
m_payloadHandler = new CompressedPayloadHandler(m_payloadHandler.ByteHandler);
}
}