public bool Connect()
{
try
{
if (!m_connection.Connect())
{
SetState(State.Terminated, m_connection.lasterror());
}
byte[] ln = m_connection.ReadLine();
if (ln == null)
{
SetState(State.Terminated, "server closed connection");
return false;
}
if (Protocol.IsCommand("ERR", ln))
{
string msg = Protocol.CommandArg("ERR", ln);
SetState(State.Terminated, "Failed to connect to server: " + msg);
return false;
}
if (Protocol.IsCommand("BAD", ln))
{
string msg = Protocol.CommandArg("BAD", ln);
SetState(State.Terminated, "Cannot connect to server: " + msg);
return false;
}
if (Protocol.IsCommand("BYE", ln))
{
string msg = Protocol.CommandArg("BYE", ln);
SetState(State.Terminated, "Server terminated connection: " + msg);
return false;
}
string banner = Encoding.UTF8.GetString(ln);
if (m_config.banner != null && m_config.banner != banner)
{
SetState(State.Terminated, "unknown service connected (banner does not match).");
return false;
}
ln = m_connection.ReadLine();
if (ln == null)
{
SetState(State.Terminated, "server closed connection");
return false;
}
else if (Protocol.IsCommand("OK", ln))
{
m_connection.WriteLine("AUTH");
ln = m_connection.ReadLine();
if (ln == null)
{
SetState(State.Terminated, "server closed connection");
return false;
}
else if (Protocol.IsCommand("MECHS", ln))
{
if (m_config.authmethod != null)
{
m_connection.WriteLine("MECH " + m_config.authmethod);
}
else
{
m_connection.WriteLine("MECH NONE");
}
ln = m_connection.ReadLine();
if (ln == null)
{
SetState(State.Terminated, "server closed connection");
return false;
}
else if (Protocol.IsCommand("OK", ln))
{
if (m_config.authmethod == null || Protocol.IsEqual(m_config.authmethod, "NONE"))
{
//... no authentication
}
else if (Protocol.IsEqual(m_config.authmethod, "WOLFRAME-CRAM"))
{
if (!AuthMechWolframeCram())
{
return false;
}
}
m_request_thread = new Thread(new ThreadStart(this.RunRequests));
m_answer_thread = new Thread(new ThreadStart(this.RunAnswers));
SetState(State.Running, null);
m_request_thread.Start();
m_answer_thread.Start();
return true;
}
else if (Protocol.IsCommand("ERR", ln))
{
SetState(State.Terminated, "authorization denied: " + Protocol.CommandArg( "ERR", ln));
return false;
}
else
{
SetState(State.Terminated, "authorization denied");
return false;
}
}
else if (Protocol.IsCommand("ERR", ln))
{
m_lasterror = Protocol.CommandArg( "ERR", ln);
return false;
}
else
{
SetState(State.Terminated, "authorization process refused");
return false;
}
}
SetState(State.Terminated, "protocol error");
return false;
}
catch (Exception soe)
{
SetState(State.Terminated, soe.Message);
return false;
}
}
