/// <summary>
/// Send response to client.
/// </summary>
/// <param name="output">socket output stream</param>
/// <param name="smtpResponse">Response to send</param>
private void SendResponse(StreamWriter output, SmtpResponse smtpResponse)
{
if (smtpResponse.Code <= 0)
{
return;
}
output.WriteLine(smtpResponse.Code + " " + smtpResponse.Message);
output.Flush();
}
/// <summary>
/// Handle an SMTP transaction, i.e. all activity between initial connect and QUIT command.
/// </summary>
/// <param name="output">output stream</param>
/// <param name="input">input stream</param>
/// <returns>List of received SmtpMessages</returns>
private void HandleSmtpTransaction(StreamWriter output, TextReader input)
{
// Initialize the state machine
SmtpState smtpState = SmtpState.CONNECT;
SmtpRequest smtpRequest = new SmtpRequest(SmtpActionType.CONNECT, String.Empty, smtpState);
// Execute the connection request
SmtpResponse smtpResponse = smtpRequest.Execute();
// Send initial response
SendResponse(output, smtpResponse);
smtpState = smtpResponse.NextState;
SmtpMessage msg = new SmtpMessage();
while (smtpState != SmtpState.CONNECT)
{
string line = input.ReadLine();
if (line == null)
{
break;
}
// Create request from client input and current state
SmtpRequest request = SmtpRequest.CreateRequest(line, smtpState);
// Execute request and create response object
SmtpResponse response = request.Execute();
// Move to next internal state
smtpState = response.NextState;
// Store input in message
msg.Store(response, request.Params);
// If message reception is complete save it
if (smtpState == SmtpState.QUIT)
{
// Remove the last carriage return and new line
string mimeMessage = msg.RawMessage;
byte[] messageBytes = Encoding.ASCII.GetBytes(mimeMessage);
Message message = new Message(messageBytes, true);
_receivedMail.Enqueue(message.ToMailMessage());
msg = new SmtpMessage();
}
// Send reponse to client after we have stored the email, so when asking for the recived mail list it will be there
// (this was not the way it was done before)
SendResponse(output, response);
}
}
/// <summary>
/// Update the headers or body depending on the SmtpResponse object and line of input.
/// </summary>
/// <param name="response">SmtpResponse object</param>
/// <param name="commandData">remainder of input line after SMTP command has been removed</param>
internal void Store(SmtpResponse response, string commandData)
{
if (commandData == null)
{
return;
}
if (SmtpState.DATA_HDR == response.NextState)
{
_rawMessageBuilder.AppendLine(commandData);
int headerNameEnd = commandData.IndexOf(":", StringComparison.Ordinal);
if (headerNameEnd >= 0)
{
string name = commandData.Substring(0, (headerNameEnd) - (0)).Trim();
string valueRenamed = commandData.Substring(headerNameEnd + 1).Trim();
// We use the Add method instead of [] because we can have multiple values for a name
_headers.Add(name, valueRenamed);
}
}
else if (SmtpState.DATA_BODY == response.NextState)
{
// The end of the headers is signified by a newline
if (_body.Length == 0)
{
_rawMessageBuilder.Append(Environment.NewLine);
}
if (_bodyLineCount > 0)
{
_rawMessageBuilder.Append(Cr);
}
_rawMessageBuilder.Append(commandData);
if (_bodyLineCount > 0)
{
_body.Append(Cr);
}
_body.Append(commandData);
_bodyLineCount++;
//if (!IsMultiPartMessage) return;
//Match boundaryMatch = Regex.Match(body.ToString(), @"boundary=""?(?<boundary>[^"";\r\n]+)""?;?", RegexOptions.IgnoreCase);
//_BaseBoundary = boundaryMatch.Groups["boundary"].Value;
}
}