private MailMessage ReceiveMessage()
{
var message = new MailMessage();
var processingFinished = false;
SendServerReady();
while (!processingFinished)
{
string nextLine;
try
{
nextLine = _clientController.Read();
}
catch (Exception e)
{
Logger.LogWarning("Stream was closed before QUIT command from server:\n" + e.Message);
break;
}
if (nextLine.Length > 0)
{
var messageCode = RequestCommandsConverter.ToRequestCommandCode(nextLine);
switch (messageCode)
{
case RequestCommands.Hello:
processingFinished = HandleHello(message, nextLine);
break;
case RequestCommands.MailFrom:
processingFinished = HandleMailFrom(message, nextLine);
break;
case RequestCommands.RcptTo:
processingFinished = HandleMailTo(message, nextLine);
break;
case RequestCommands.Data:
processingFinished = HandleDataSection(message, nextLine);
break;
case RequestCommands.Quit:
processingFinished = HandleQuit(message, nextLine);
break;
case RequestCommands.StartTls:
processingFinished = SwitchToTls(message, nextLine);
break;
case RequestCommands.ParseError:
processingFinished = true;
break;
}
}
}
return(message);
}
private bool HandleHello(MailMessage message, string nextLine)
{
var responseStatus = _clientController.IsTlsAvailable ? ResponseCodes.SrvHello : ResponseCodes.SrvHelloNoTls;
var response = ServerStatusCodesConverter.GetTextResponseForStatus(responseStatus, _clientController.HostName);
_clientController.Write(response);
return(false);
}
private bool HandleMailFrom(MailMessage message, string nextLine)
{
MailAddress sender;
try
{
sender = EmailParser.ParseEmailFromString(nextLine);
}
catch
{
_clientController.Write(ServerStatusCodesConverter.GetTextResponseForStatus(ResponseCodes.MbNameNotAllowed));
return(true);
}
message.From = sender;
_clientController.Write(ServerStatusCodesConverter.GetTextResponseForStatus(ResponseCodes.RqstActOkCompleted));
return(false);
}
private bool SwitchToTls(MailMessage message, string nextLine)
{
_clientController.Write(ServerStatusCodesConverter.GetTextResponseForStatus(ResponseCodes.SrvReady, _clientController.HostName));
try
{
_clientController.SwitchToTlsProtocol();
}
catch (Exception e)
{
Logger.LogError(string.Format("Exception occurred while switching to TLS:\n{0}", e.Message));
if (e.InnerException != null)
{
Logger.LogError(string.Format("Inner exception: {0}\n", e.InnerException.Message));
}
_clientController.Write(ServerStatusCodesConverter.GetTextResponseForStatus(ResponseCodes.AccessDenied));
return(true);
}
return(false);
}
private bool HandleDataSection(MailMessage message, string nextLine)
{
_clientController.Write(ServerStatusCodesConverter.GetTextResponseForStatus(ResponseCodes.StrtInputEndWith));
var messageData = new StringBuilder();
var strMessage = _clientController.Read();
_clientController.Write(ServerStatusCodesConverter.GetTextResponseForStatus(ResponseCodes.RqstActOkCompleted));
while (!strMessage.Contains("\r\n.\r\n")) //Contains because some times QUIT is added right to the body
{
messageData.Append(strMessage);
strMessage = _clientController.Read();
}
messageData.Append(strMessage);
var msgDataStr = messageData.ToString();
var headers = EmailParser.ParseHeadersFromDataSection(msgDataStr);
var parsedCcList = EmailParser.ParseEmailsFromDataCc(headers);
var parsedToList = EmailParser.ParseEmailsFromDataTo(headers);
var parsedFromList = EmailParser.ParseEmailsFromDataFrom(headers);
var toList = MergeToList(message.To, parsedToList, parsedCcList);
message.To = toList;
message.CC = parsedCcList;
message.From = GetMailAddressesByAddress(message.From, parsedFromList);
message.Body = EmailParser.ParseBodyFromDataSection(msgDataStr);
message.Subject = EmailParser.ParseSubjectFromDataSection(headers);
message.Headers = headers;
message.IsBodyHtml = EmailParser.GetIsMailBodyHtml(headers);
message.MailMessageDataSection = msgDataStr.Trim();
_clientController.Write(ServerStatusCodesConverter.GetTextResponseForStatus(ResponseCodes.RqstActOkCompleted));
return(ClientHasEndedSendingMail(msgDataStr));
}
private bool HandleMailTo(MailMessage message, string nextLine)
{
MailAddress recipient;
try
{
recipient = EmailParser.ParseEmailFromString(nextLine);
}
catch
{
_clientController.Write(ServerStatusCodesConverter.GetTextResponseForStatus(ResponseCodes.MbNameNotAllowed));
return(true);
}
if (message.To.All(a => a.Address != recipient.Address))
{
message.To.Add(recipient);
}
_clientController.Write(ServerStatusCodesConverter.GetTextResponseForStatus(ResponseCodes.RqstActOkCompleted));
return(false);
}
private bool HandleQuit(MailMessage message, string nextLine)
{
return(true);
}
