private void ProcessRecvData(IAsyncResult result)
{
if (shutdownQueued)
{
return; //suppress any errors during shutdown
}
try
{
int recvLen = tcpStream.EndRead(result);
if (recvLen <= 0)
{
throw new Exception("RecvLength less than or equal to zero.");
}
string recvText = System.Text.Encoding.ASCII.GetString(recvBuff, 0, recvLen);
tcpStream.BeginRead(recvBuff, 0, recvBuff.Length, ProcessRecvData, null);
Logger.Debug?.WriteLine("[<- RECV] " + recvText.Replace("\r\n", ""));
connLog.Add("[<- RECV] " + recvText.Replace("\r\n", ""));
//try executing the received text as a SMTP command
TryExecCommand(recvText);
}
catch (Exception e)
{
Logger.Critical?.WriteLine("TCP read critical error, details: " + e.ToString());
shutdownQueued = true;
ownerServer.QueueEndConnection(connId);
}
}
public RemoteConnection(TcpClient client, Dictionary <string, string> config, SMTPServer owner, int connectionId)
{
tcpClient = client;
serverConfig = config;
ownerServer = owner;
connId = connectionId;
//setting up defaults in config
if (!config.ContainsKey("Domain"))
{
config.Add("Domain", "NoDomain");
}
if (!config.ContainsKey("MessageMaxBytes"))
{
config.Add("MessageMaxBytes", "1000000");
}
recvBuff = new byte[config.ContainsKey("BufferSize") ? int.Parse(config["BufferSize"]) : 4096];
try
{
tcpClient.ReceiveBufferSize = recvBuff.Length;
tcpClient.SendBufferSize = recvBuff.Length;
tcpStream = tcpClient.GetStream();
tcpStream.BeginRead(recvBuff, 0, recvBuff.Length, ProcessRecvData, null);
SendResponse(new SMTPResult(SMTPResponseCode.ServerReady, config["Domain"] + " SEMPTY Server is ready for, welcome."));
}
catch (Exception e)
{
Logger.Critical?.WriteLine("TCP critical error, cannot establish connection: " + e.ToString());
shutdownQueued = true;
ownerServer.QueueEndConnection(connId);
}
}